阅读说明：本技术 光圈装置、透镜镜筒及摄像装置或投影装置 (Aperture device, lens barrel, and imaging device or projection device ) 是由 花冈崇文 于 2018-12-05 设计创作，主要内容包括：光圈装置(10)具备：光圈叶片(100),具有第1固定凸起(120)及从第1平板(102)的另一面起向第2方向侧突出的移动凸起(130)；漏光防止叶片(200),具有第2固定凸起(220),与光圈叶片(100)一起组成一对；驱动环(300),形成有第1凸轮槽(330)；及收容体(400),对光圈叶片(100)、漏光防止叶片(200)及驱动环(300)进行收容。在漏光防止叶片(200)上还设置有第2凸轮槽(230),光圈叶片(100)的移动凸起(130)被插嵌在漏光防止叶片(200)的第2凸轮槽(230)中且被插嵌在驱动环(300)的第1凸轮槽(330)中。漏光防止叶片(200)具有比第2固定凸起(220)更向另一侧延伸的漏光防止叶片延伸设置部(250)。根据光圈装置(10),可比现有光圈装置更容易增加光圈叶片的片数,且可维持光圈叶片及漏光防止叶片的重叠顺序。(The aperture device (10) is provided with: a diaphragm blade (100) having a 1 st fixing boss (120) and a moving boss (130) protruding from the other surface of the 1 st plate (102) in the 2 nd direction; a light leakage preventing blade (200) having a 2 nd fixing protrusion (220) which is formed as a pair together with the diaphragm blade (100); a drive ring (300) formed with a 1 st cam groove (330); and a housing body (400) for housing the diaphragm blade (100), the light leakage preventing blade (200) and the drive ring (300). A2 nd cam groove (230) is further provided on the light leakage preventing blade (200), and a moving boss (130) of the diaphragm blade (100) is inserted into the 2 nd cam groove (230) of the light leakage preventing blade (200) and into a 1 st cam groove (330) of the drive ring (300). The light leakage prevention blade (200) has a light leakage prevention blade extension setting part (250) extending to the other side than the 2 nd fixing protrusion (220). According to the aperture device (10), the number of aperture blades can be increased more easily than in the conventional aperture device, and the overlapping order of the aperture blades and the light leakage preventing blades can be maintained.)

1. A diaphragm device for changing the aperture diameter of a diaphragm aperture by advancing and retracting a plurality of blades with respect to an optical axis, comprising:

a diaphragm blade which is composed of a 1 st flat plate and has a 1 st blade portion for blocking light entering an aperture of the diaphragm device, a 1 st fixed boss protruding from one surface of the 1 st flat plate in a 1 st direction along the optical axis, and a moving boss protruding from the other surface of the 1 st flat plate in a 2 nd direction opposite to the 1 st direction;

a light leakage prevention blade which is composed of a 2 nd flat plate, has a 2 nd blade part for shielding a light leakage part except the diaphragm aperture of the diaphragm device, and a 2 nd fixing protrusion protruding from one surface of the 2 nd flat plate in the 1 st direction, and is paired with the diaphragm blade;

a drive ring which is inserted into the moving boss, has a 1 st cam groove having a different distance from the optical axis depending on the position of the cam groove, and moves the 1 st cam groove in a circumferential direction around the optical axis by rotating around the optical axis;

and a housing body housing the aperture blade, the light leakage preventing blade, and the driving ring, characterized in that,

the stop device includes a plurality of pairs of the stop blade and the light leakage preventing blade, the driving ring has a plurality of the 1 st cam grooves formed corresponding to the moving projections,

a pair of 1 st and 2 nd holes into which the 1 st and 2 nd fixing protrusions are respectively inserted are provided in the housing body in a pair corresponding to each of the pair of the aperture blades and the light leakage preventing blades,

a 2 nd cam groove is further provided on the light leakage preventing blade,

the moving projection of the stop blade is inserted in the 2 nd cam groove of the light leakage preventing blade and inserted in the 1 st cam groove of the driving ring,

the 2 nd plate of the light leakage prevention blade is provided with a light leakage prevention blade extension setting part which extends to the other side than the 2 nd fixing protrusion when the 2 nd plate is observed from the 2 nd fixing protrusion and one side of the 2 nd blade part is taken as one side.

2. The aperture device according to claim 1,

the aperture blade of the aperture blade and the light leakage preventing blade constituting a pair, the light leakage preventing blade of the aperture blade and the light leakage preventing blade constituting a pair, the aperture blade of the aperture blade and the light leakage preventing blade constituting a next pair located beside the aperture blade and the light leakage preventing blade constituting a pair, and the light leakage preventing blade of the aperture blade and the light leakage preventing blade constituting a next pair are arranged so as to overlap upward in this order when the 2 nd direction is defined as upward,

when the aperture arrangement is viewed along the optical axis,

a part of an outer profile of the aperture blade of the next pair of the aperture blade and the light leakage preventing blade is always overlapped with the light leakage preventing blade of the aperture blade and the light leakage preventing blade of the pair of the aperture blade and the light leakage preventing blade,

when the aperture diameter of the aperture opening is the smallest, a part of the outer contour of the aperture blade constituting the next pair of the aperture blade and the light leak prevention blade overlaps with the light leak prevention blade extension portion of the light leak prevention blade constituting the pair of the aperture blade and the light leak prevention blade.

3. Aperture device according to claim 1 or 2,

the aperture blade is constituted by the 1 st plate in an elongated body shape having a long axis as a whole,

the 1 st fixing protrusion is provided on one side of the 1 st plate in the longitudinal direction, and a stop blade extension portion is provided on the other side,

the diaphragm blade extension portion has an inner peripheral edge formed in substantially the same shape as a part of the shape of the diaphragm opening when the aperture diameter of the diaphragm opening is maximum,

at least a part of the aperture blade extension portion on the outer circumferential side of the inner circumferential edge is configured to be always located on the outer circumferential side of the inner circumferential edge of the housing, that is, the inner circumferential edge of the housing or always located on the outer circumferential side of the inner circumferential edge of the drive ring, that is, the inner circumferential edge of the drive ring,

when the aperture arrangement is viewed along the optical axis,

at least a part of the aperture blade extension portion of the aperture blade is always superposed on the light leakage preventing blade located on the opposite side with respect to the optical axis as viewed from the 1 st fixing projection of the aperture blade,

when the aperture diameter of the aperture opening is at a maximum, a part of the aperture blade extension portion of the aperture blade is overlapped on the leak-light preventing blade extension portion of the leak-light preventing blade located on the opposite side.

4. A diaphragm device for changing the aperture diameter of a diaphragm aperture by advancing and retracting a plurality of blades with respect to an optical axis, comprising:

a diaphragm blade which is composed of a 1 st flat plate and has a 1 st blade portion for blocking light entering an aperture of the diaphragm device, a 1 st fixed boss protruding from one surface of the 1 st flat plate in a 1 st direction along the optical axis, and a moving boss protruding from the other surface of the 1 st flat plate in a 2 nd direction opposite to the 1 st direction;

a light leakage prevention blade which is composed of a 2 nd flat plate, has a 2 nd blade part for shielding a light leakage part except the diaphragm aperture of the diaphragm device, and a 2 nd fixing protrusion protruding from one surface of the 2 nd flat plate in the 1 st direction, and is paired with the diaphragm blade;

a drive ring which is inserted into the moving boss, has a 1 st cam groove having a different distance from the optical axis depending on the position of the cam groove, and moves the 1 st cam groove in a circumferential direction around the optical axis by rotating around the optical axis;

and a housing body housing the aperture blade, the light leakage preventing blade, and the driving ring, characterized in that,

the stop device includes a plurality of pairs of the stop blade and the light leakage preventing blade, the driving ring has a plurality of the 1 st cam grooves formed corresponding to the moving projections,

a pair of 1 st and 2 nd holes into which the 1 st and 2 nd fixing protrusions are respectively inserted are provided in the housing body in a pair corresponding to each of the pair of the aperture blades and the light leakage preventing blades,

a 2 nd cam groove is further provided on the light leakage preventing blade,

the moving projection of the stop blade is inserted in the 2 nd cam groove of the light leakage preventing blade and inserted in the 1 st cam groove of the driving ring,

the aperture device further includes an intermediate blade disposed between the light leakage preventing blade and the aperture blade,

the aperture blade of the aperture blade and the light leak prevention blade constituting a pair, the light leak prevention blade of the aperture blade and the light leak prevention blade constituting a pair, the intermediate blade, the aperture blade of the aperture blade and the light leak prevention blade constituting a next pair located beside the aperture blade and the light leak prevention blade constituting a pair, and the light leak prevention blade of the aperture blade and the light leak prevention blade constituting a next pair are arranged so as to overlap upward in this order when the 2 nd direction is defined as upward,

when the aperture device is observed along the optical axis, the intermediate blade always coincides with the aperture blade of the one pair and the light leakage prevention blade, and the intermediate blade always coincides with the aperture blade of the next pair and the aperture blade of the light leakage prevention blade.

5. The aperture device according to claim 4, wherein the intermediate blade is fixed to the housing so as not to interfere with movement of the aperture blade and the light leakage prevention blade.

6. Aperture device according to claim 4 or 5,

the aperture blade is constituted by the 1 st plate in an elongated body shape having a long axis as a whole,

the 1 st fixing protrusion is provided on one side of the 1 st plate in the longitudinal direction, and a stop blade extension portion is provided on the other side,

the diaphragm blade extension portion has an inner peripheral edge formed in substantially the same shape as a part of the shape of the diaphragm opening when the aperture diameter of the diaphragm opening is maximum,

at least a part of the aperture blade extension portion on the outer circumferential side of the inner circumferential edge is configured to be always located on the outer side of the inner circumferential edge of the housing, i.e., the inner circumferential edge of the housing, or the inner circumferential edge of the drive ring, i.e., the inner circumferential edge of the drive ring,

when the aperture arrangement is viewed along the optical axis,

a part of the aperture blade extension portion of the aperture blade is overlapped on the light leakage preventing blade located on the opposite side with respect to the optical axis as viewed from the 1 st fixing projection of the aperture blade when the aperture diameter of the aperture opening is minimum,

in a process of transition of the aperture diameter of the diaphragm aperture from the minimum to the maximum, a part of the diaphragm blade extension portion of the diaphragm blade is overlapped on the intermediate blade located on the opposite side with respect to the optical axis as viewed from the 1 st fixing projection of the diaphragm blade.

7. The aperture device according to any one of claims 1 to 6,

the aperture blade is constituted by the 1 st plate in an elongated body shape having a long axis as a whole,

the 1 st fixing protrusion is provided on one side of the 1 st plate in the longitudinal direction, and a stop blade extension portion is provided on the other side,

the diaphragm blade extension portion has an inner peripheral edge formed in substantially the same shape as a part of the shape of the diaphragm opening when the aperture diameter of the diaphragm opening is maximum,

the aperture blade extension portion is further provided with an engaging convex portion configured to be always located outside the inner circumferential edge of the housing, i.e., the housing inner circumferential edge, of the housing or always located outside the inner circumferential edge of the drive ring, i.e., the drive ring inner circumferential edge, and to be engaged with the housing inner circumferential edge.

8. A lens barrel containing the diaphragm device and the lens according to any one of claims 1 to 7.

9. An imaging device or a projection device, comprising the aperture device according to any one of claims 1 to 7 or the lens barrel according to claim 8.

Technical Field

The present invention relates to an aperture device, a lens barrel, and an imaging device or a projection device.

Background

An image pickup apparatus such as a video camera uses a diaphragm device for adjusting the light amount of subject light incident on an image formation surface. The diaphragm device is provided with an annular accommodating body. When the aperture diameter of the aperture opening is at a maximum (fully open), the aperture blades are retracted within the width of the housing. Therefore, as the retreat space of the diaphragm blades, the width of the housing body must be at least equal to or larger than the width of the diaphragm blades.

In order to miniaturize the diaphragm device, conventionally, efforts have been made to narrow the width of the diaphragm blades themselves (narrowing of the diaphragm blades) so as to narrow the clearance space of the diaphragm blades.

However, it is known that, when the aperture blades are narrowed, light leakage tends to occur in portions other than the aperture.

In order to solve the problem of the light leakage, a diaphragm device has been known in the related art (for example, see patent document 1) in which a light leakage prevention blade is introduced in addition to a diaphragm blade so that a gap causing the light leakage is filled by the light leakage prevention blade.

Fig. 14 is a plan view showing a conventional diaphragm device 900 for explanation. Fig. 14(a) is a plan view of the aperture device 900 viewed along the optical axis OA. Fig. 14(a) shows only a case where the light leakage prevention blade 920 protrudes, and the illustration of the stop blade 910 is omitted. Fig. 14(b), 14(c), and 14(d) are plan views showing the aperture blade 910, the light leakage preventing blade 920, and the housing 940, respectively.

As shown in fig. 14, a conventional diaphragm device 900 is a diaphragm device 900 that changes the aperture diameter of a diaphragm aperture by moving a plurality of blades forward and backward with respect to an optical axis OA, and includes: a diaphragm blade 910 having a diaphragm blade body 911, a diaphragm blade fixing boss 912 protruding from one surface of the diaphragm blade body 911 in the 1 st direction along the optical axis OA, and a diaphragm blade moving boss 913 protruding from the other surface of the diaphragm blade body 911 in the 2 nd direction opposite to the 1 st direction; a light leakage preventing blade 920 having a light leakage preventing blade body 921, a light leakage preventing blade fixing protrusion 922 protruding from one surface of the light leakage preventing blade body 921 in the 1 st direction side, and a light leakage preventing blade moving protrusion 923 protruding from the other surface of the light leakage preventing blade body 921 in the 2 nd direction side, and forming a pair together with the aperture blade 910; a drive ring 930 fitted with the movable projection, having a cam groove 933 with a different distance from the optical axis OA depending on the position of the groove, and rotating around the optical axis OA to move the cam groove 933 in a circumferential direction around the optical axis OA; and a housing 940 for housing the diaphragm blade 910, the light leakage preventing blade 920 and the driving ring 930, the aperture stop device 900 includes a plurality of pairs of aperture blades 910 and leak light preventing blades 920 (6 pairs are provided in the conventional aperture stop device 900 of fig. 14), on the driving ring 930, cam grooves 933 are formed in the number corresponding to the number of pairs of the diaphragm blades 910 and the light leakage preventing blades 920 constituting a pair, in the housing 940, a pair of 1 st and 2 nd holes 941j and 942j into which the pair of stop blade fixing protrusions 912 and the pair of light leakage preventing blades 922 are inserted are provided corresponding to the pair of stop blade 910 and the pair of light leakage preventing blade 920, and the stop blade moving protrusion 913 and the light leakage preventing blade moving protrusion 923 of the pair of stacked stop blade 910 and light leakage preventing blade 920 are inserted into one cam groove 933 (j is an integer of 1 or more), respectively.

According to the conventional aperture device 900, the light leakage prevention blade 920 can be added by using the conventional basic structure (housing body, drive ring, etc.) for driving the aperture blade in this way, and therefore, light leakage accompanying narrowing of the aperture blade can be prevented.

Patent document

Patent document 1: japanese unexamined patent publication Hei 5-113591

Disclosure of Invention

(1) However, the conventional diaphragm device 900 is configured such that the diaphragm blade moving projection 913 and the light leakage preventing blade moving projection 923 are respectively inserted into one cam groove 933, and 2 kinds of blades (the diaphragm blade 910 and the light leakage preventing blade 920) are driven by one cam groove 933. Thus, as the length of the cam groove 933, a length for driving the light leakage preventing blade 920 is required in addition to a length for driving the stop blade 910.

That is, the cam groove 933 needs to have a portion in which the groove for driving the stop blade 910 and a portion in which the groove for driving the light leakage prevention blade 920 are provided, and thus needs to have a longer extended length than a configuration in which only one of the blades is provided.

In this manner, according to the conventional diaphragm apparatus 900, since 2 kinds of blades are driven by one cam groove, a long cam groove is required, and thus it is difficult to increase the number of cam grooves that can be provided in a limited space of the drive ring 930, and further, it is difficult to increase the number of diaphragm blades.

(2) In general, in a diaphragm device, a plurality of pairs of diaphragm blades and light leakage preventing blades are housed in a housing such that fixing projections of the respective blades are inserted into corresponding holes provided in the housing, and the diaphragm blades and the light leakage preventing blades are sequentially stacked upward.

For example, in the conventional aperture stop device 900, the aperture blade 910j of the aperture blade 910j and the leak-light preventing blade 920j "forming a pair, the leak-light preventing blade 920j of the aperture blade 910j and the leak-light preventing blade 920 j" forming a pair, and the aperture blade 910j +1 of the aperture blade 910j +1 and the leak-light preventing blade 920j +1 "forming a next pair and located beside the aperture blade 910j and the leak-light preventing blade 920 j" forming a pair, and the leak-light preventing blade 920j +1 of the aperture blade 910j +1 and the leak-light preventing blade 920j +1 "forming a next pair are arranged so as to be overlapped upward in this order (see fig. 14(d), and the illustration of the case of blade overlapping is omitted).

In addition, the 2 nd direction is defined as up, and the 1 st direction is defined as down.

However, in the conventional aperture stop device 900, there is a problem that in a process of reducing or increasing the aperture diameter of the aperture opening (a process of adjusting the aperture), the order of overlapping the aperture blade 910 and the light leakage prevention blade 920 may be broken depending on the case, and the order of overlapping the blades cannot be maintained.

Fig. 15 is a plan view showing an example of a conventional aperture stop device 900 in which the overlapping order of the aperture blade 910 and the leak-light preventing blade 920 is broken. Fig. 15 shows both the pair of stop blades 910j and the leak-light preventing blade 920j, and the stop blade 910j +1 of the next pair of stop blade 910j +1 and the leak-light preventing blade 920j +1 located beside the pair of stop blade 910j and the leak-light preventing blade 920j, and the other blades are not shown.

For example, as shown in fig. 15, in a conventional aperture stop device 900, a stop blade 910j +1 that should be originally overlapped on the leak-light preventing blade 920j may be separated from the leak-light preventing blade 920j during adjustment of the aperture, and the stop blade 910j +1 and the leak-light preventing blade 920j may belong to the same layer. This state is one of the states in which the overlapping order of the aperture blades and the leak-light prevention blades is broken, and the overlapping order of these blades cannot be maintained.

Further, when the aperture diameter is further increased from this state and the stop blade and the light leakage preventing blade are operated, for example, a part of the outer contour 915 of the stop blade 910j +1 comes into contact with the inner peripheral edge 928 of the light leakage preventing blade 920j, which causes inconvenience of preventing smooth movement of the blade. In some cases, the stop blade 910j +1 may be submerged below the leak-light preventing blade 920j, and the order of overlapping the blades may be changed. When the aperture diameter is further increased from this state and the aperture is operated, the outer contour 915 of the aperture blade 910j +1 may collide with the leak-light preventing blade fixing projection 922 of the leak-light preventing blade 920 j.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a diaphragm device capable of easily increasing the number of diaphragm blades and maintaining the overlapping order of the diaphragm blades and the light leakage prevention blades.

(1) A 1 st aperture device according to the present invention is an aperture device that changes an aperture diameter of an aperture opening by advancing and retracting a plurality of blades with respect to an optical axis, the aperture device including: a diaphragm blade which is composed of a 1 st flat plate and has a 1 st blade portion for blocking light entering an aperture of the diaphragm device, a 1 st fixed boss protruding from one surface of the 1 st flat plate in a 1 st direction along the optical axis, and a moving boss protruding from the other surface of the 1 st flat plate in a 2 nd direction opposite to the 1 st direction; a light leakage prevention blade which is composed of a 2 nd flat plate, has a 2 nd blade part for shielding a light leakage part except the diaphragm aperture of the diaphragm device, and a 2 nd fixing protrusion protruding from one surface of the 2 nd flat plate in the 1 st direction, and is paired with the diaphragm blade; a drive ring which is inserted into the moving boss, has a 1 st cam groove having a different distance from the optical axis depending on the position of the cam groove, and moves the 1 st cam groove in a circumferential direction around the optical axis by rotating around the optical axis; and a housing body housing the aperture blade, the light leakage preventing blade and the drive ring, wherein the aperture device includes a plurality of pairs of the aperture blade and the light leakage preventing blade, a plurality of 1 st cam grooves are formed in the drive ring corresponding to the respective moving protrusions, a pair of 1 st and 2 nd holes into which the 1 st and 2 nd fixing bosses are respectively inserted are provided in the housing body corresponding to the respective pairs of the aperture blade and the light leakage preventing blade, and a 2 nd cam groove is further provided in the housing body, the moving protrusion of the aperture blade is inserted into the 2 nd cam groove of the light leakage preventing blade and inserted into the 1 st cam groove of the drive ring, the 2 nd plate of the light leakage prevention blade is provided with a light leakage prevention blade extension setting part which extends to the other side than the 2 nd fixing protrusion when the 2 nd plate is observed from the 2 nd fixing protrusion and one side of the 2 nd blade part is taken as one side.

According to the 1 st stop device of the present invention, since the 2 nd cam groove is further provided on the light leakage preventing blade, the moving boss of the stop blade is inserted into the 2 nd cam groove of the light leakage preventing blade and into the 1 st cam groove of the driving ring, when the driving ring rotates, a force acts on the moving boss through the 1 st cam groove of the driving ring on the stop blade, and the 1 st blade portion of the stop blade rotates with the 1 st fixed boss as a fulcrum (rotation shaft). Meanwhile, as the moving boss moves along the 1 st cam groove, a force acts on the 2 nd cam groove by the moving boss at the light leakage preventing blade, and the 2 nd blade portion of the light leakage preventing blade rotates with the 2 nd fixed boss as a fulcrum (rotation shaft). In this manner, although the projection inserted into the 1 st cam groove of the drive ring is only the moving projection of the diaphragm blade, the light leakage preventing blades may be driven simultaneously in conjunction with driving the diaphragm blade.

According to the 1 st diaphragm device, since it is not necessary to form a cam groove pattern for driving the light leakage preventing blade on the 1 st cam groove, the length of the 1 st cam groove can be made shorter than that of the cam groove in the conventional diaphragm device accordingly. Since the length of the 1 st cam groove can be shortened, it is easy to increase the number of the 1 st cam grooves that can be provided on the drive ring. Further, since it is not necessary to form a dedicated cam groove for driving the light leakage preventing blade on the drive ring, it is only necessary to form the 1 st cam groove for driving the aperture blade on the drive ring. Therefore, since the restriction on the space when the 1 st cam groove is formed on the drive ring is reduced, the degree of freedom in designing the shape of the 1 st cam groove is improved. Thus, according to the 1 st device of the present invention, a diaphragm device in which the number of diaphragm blades can be easily increased can be provided.

The 2 nd diaphragm device of the present invention described later in (4) also has the same operation and effect. Therefore, the description of the action and effect in this paragraph is cited in the following paragraph of action and effect (2).

In the 1 st aperture device according to the present invention, the 2 nd plate of the light leakage preventing blade further includes a light leakage preventing blade extending portion extending to the other side than the 2 nd fixing protrusion when the 2 nd blade portion is located on one side as viewed from the 2 nd fixing protrusion.

Therefore, the light leakage preventing blade extension portion of the light leakage preventing blade and the adjacent aperture blade overlapped on the light leakage preventing blade can be continuously overlapped while maintaining the overlapping order in the whole process of adjusting the aperture. Therefore, it is possible to prevent the diaphragm blade from falling off the leak-light prevention blade to be in the same layer as the leak-light prevention blade, or to prevent the diaphragm blade from falling under the leak-light prevention blade to change the order of overlapping the blades.

Thus, according to the 1 st aperture device of the present invention, the overlapping order of the aperture blade and the light leakage preventing blade can be maintained.

(2) In the 1 st aperture device according to the present invention, it is preferable that when the 2 nd direction is defined as up, the aperture blade of the aperture blade and the leak-light preventing blade of the one pair, the leak-light preventing blade of the aperture blade and the leak-light preventing blade of the one pair, the aperture blade of the aperture blade and the leak-light preventing blade of the next pair located beside the aperture blade and the leak-light preventing blade of the one pair, and the leak-light preventing blade of the aperture blade and the leak-light preventing blade of the next pair are arranged in this order so as to be overlapped upward, and that when the aperture device is observed along the optical axis, a part of an outer contour of the aperture blade of the next pair and the leak-light preventing blade always overlaps with the leak-light preventing blade of the aperture blade and the leak-light preventing blade of the one pair, when the aperture diameter of the aperture opening is the smallest, a part of the outer contour of the aperture blade constituting the next pair of the aperture blade and the light leak prevention blade overlaps with the light leak prevention blade extension portion of the light leak prevention blade constituting the pair of the aperture blade and the light leak prevention blade.

In the 1 st aperture device of the present invention, a part of the outer contour of the aperture blade constituting the next pair of aperture blade and light leakage preventing blade and the light leakage preventing blade constituting the pair of aperture blade and light leakage preventing blade always coincide. Therefore, the outer contour of the aperture blade stays within the range of the light leakage preventing blade, and thus, it is possible to prevent the aperture blade from falling off the light leakage preventing blade to be in the same layer as the light leakage preventing blade or to prevent the aperture blade from falling under the light leakage preventing blade to change the overlapping order of the blades.

In the 1 st aperture device of the present invention, even when the aperture diameter of the aperture opening is the smallest, which is the state in which the order of the blades is most likely to be changed, a part of the outer contour of the aperture blade constituting the next pair of the aperture blade and the leak-light preventing blade overlaps with the leak-light preventing blade extension portion of the leak-light preventing blade constituting the pair of the aperture blade and the leak-light preventing blade. Therefore, the outer contour of the aperture blade stays within the range of the light leakage prevention blade extension portion of the light leakage prevention blade, and thus, it is possible to prevent the aperture blade from falling off from the light leakage prevention blade to the same layer as the light leakage prevention blade or to prevent the aperture blade from falling under the light leakage prevention blade to change the order of overlapping the blades.

Thus, according to the 1 st aperture device of the present invention, the overlapping order of the aperture blade and the light leakage preventing blade can be maintained.

(3) In the 1 st aperture device according to the present invention, it is preferable that the aperture blade is formed as a whole of the 1 st plate having an elongated body shape, the 1 st fixing projection is provided on one side of the 1 st plate in the longitudinal direction, and an aperture blade extension portion having an inner peripheral edge formed in substantially the same shape as a part of the shape of the aperture opening when the aperture diameter of the aperture opening is maximized is provided on the other side, and at least a part of the aperture blade extension portion on the outer peripheral side than the inner peripheral edge is formed so as to be always located on the inner peripheral edge of the housing or the outer peripheral edge of the drive ring as the inner peripheral edge of the drive ring, and when the aperture device is observed along the optical axis, at least a part of the aperture blade extension portion of the aperture blade is always superposed on the light leakage preventing blade located on the opposite side across the optical axis as viewed from the 1 st fixing projection of the aperture blade, and a part of the aperture blade extension portion of the aperture blade is superposed on the light leakage preventing blade extension portion of the light leakage preventing blade located on the opposite side when the aperture diameter of the aperture opening is maximized.

In the 1 st aperture device of the present invention, the aperture blade is provided with an aperture blade extension portion, at least a part of the aperture blade extension portion of the aperture blade is always superposed on the light leakage preventing blade located on the opposite side with respect to the optical axis as viewed from the 1 st fixing projection of the aperture blade, and when the aperture diameter of the aperture opening is maximized, a part of the aperture blade extension portion of the aperture blade is configured to be superposed on the light leakage preventing blade extension portion of the light leakage preventing blade located on the opposite side.

Therefore, the order of overlapping the blades can be prevented from being changed when the tip end side of the aperture blade extension portion is submerged under the light leakage prevention blade located on the opposite side with respect to the optical axis as viewed from the 1 st fixing projection of the aperture blade. Thus, the overlapping order of the aperture blade and the light leakage preventing blade can be maintained.

In the 1 st diaphragm device according to the present invention, at least a portion of the diaphragm blade extension portion on the outer circumferential side of the inner circumferential edge is configured to be always located on the outer circumferential side of the inner circumferential edge of the housing, i.e., the housing inner circumferential edge, or always located on the outer circumferential side of the inner circumferential edge of the drive ring, i.e., the drive ring inner circumferential edge.

Therefore, the diaphragm blades can be bridged across the opening of the housing or the drive ring by being bridged on the inner peripheral edge of the housing or the drive ring by the 1 st fixing boss side and the tip end side of the diaphragm blade extension portion, like the double support beams. Therefore, the phenomenon that the tip ends of the plurality of diaphragm blades are woven and rise toward the diaphragm aperture can be prevented. Therefore, the quality of the diaphragm device in appearance can be improved.

(4) A 2 nd diaphragm device according to the present invention is a diaphragm device that changes an aperture diameter of a diaphragm aperture by advancing and retracting a plurality of blades with respect to an optical axis, the diaphragm device including: a diaphragm blade which is composed of a 1 st flat plate and has a 1 st blade portion for blocking light entering an aperture of the diaphragm device, a 1 st fixed boss protruding from one surface of the 1 st flat plate in a 1 st direction along the optical axis, and a moving boss protruding from the other surface of the 1 st flat plate in a 2 nd direction opposite to the 1 st direction; a light leakage prevention blade which is composed of a 2 nd flat plate, has a 2 nd blade part for shielding a light leakage part except the diaphragm aperture of the diaphragm device, and a 2 nd fixing protrusion protruding from one surface of the 2 nd flat plate in the 1 st direction, and is paired with the diaphragm blade; a drive ring which is inserted into the moving boss, has a 1 st cam groove having a different distance from the optical axis depending on the position of the cam groove, and moves the 1 st cam groove in a circumferential direction around the optical axis by rotating around the optical axis; and a housing body housing the aperture blade, the light leakage preventing blade, and the drive ring, the aperture device including a plurality of pairs of the aperture blade and the light leakage preventing blade, the drive ring having a plurality of 1 st cam grooves formed corresponding to the respective moving protrusions, the housing body having a pair of 1 st and 2 nd holes formed therein for inserting the 1 st and 2 nd fixing protrusions, respectively, corresponding to the pair of the aperture blade and the light leakage preventing blade, the light leakage preventing blade further having a 2 nd cam groove formed therein, the moving protrusion of the aperture blade being inserted into the 2 nd cam groove of the light leakage preventing blade and inserted into the 1 st cam groove of the drive ring, the aperture device further includes an intermediate blade disposed between the light leakage preventing blade and the aperture blade, the aperture blade of the aperture blade and the light leakage preventing blade of the aperture blade of the pair, the intermediate blade, the aperture blade of the aperture blade and the light leakage preventing blade of the next pair located beside the aperture blade and the light leakage preventing blade of the pair, and the light leakage preventing blade of the aperture blade and the light leakage preventing blade of the next pair are disposed so as to overlap upward in this order, and the intermediate blade and the aperture blade of the aperture blade and the light leakage preventing blade of the pair always overlap when the aperture device is observed along the optical axis, and the intermediate blade is always coincident with the aperture blades of the aperture blade and the light leakage preventing blade constituting the next pair.

The 2 nd aperture stop device of the present invention further includes an intermediate blade disposed between the light leakage prevention blade and the aperture blade. The intermediate blade and the light leakage preventing blade of the aperture blade and the light leakage preventing blade forming the pair are configured to be always overlapped. In this way, since the region where the intermediate blade overlaps the light leakage preventing blade is secured, the intermediate blade can be surely included in the upper layer of the adjacent light leakage preventing blade.

The intermediate blade is configured to be always overlapped with the aperture blade and the aperture blade of the leak-light preventing blade that constitute the next pair. In this way, since the area where the diaphragm blade overlaps the intermediate blade is secured, the diaphragm blade can be surely included in the upper layer of the intermediate blade.

In this way, since it is specified that the aperture blade surely belongs to the layer above the leak-light preventing blade via the intermediate blade, according to the 2 nd aperture device of the present invention, the overlapping order of the aperture blade and the leak-light preventing blade can be maintained.

(5) In the 2 nd aperture device according to the present invention, it is preferable that the intermediate blade is fixed to the housing so as not to interfere with movement of the aperture blade and the light leakage prevention blade.

In other words, the 2 nd diaphragm device of the present invention does not operate the intermediate blade in conjunction with the operation of the diaphragm blade. Therefore, the diaphragm device having high energy conversion efficiency can be formed by 3 blades (the diaphragm blade, the light leakage prevention blade, and the intermediate blade) without consuming energy for driving the blades other than moving the diaphragm blade and the light leakage prevention blade.

Further, since the diaphragm blade and the light leakage prevention blade are fixed so as not to interfere with the movement of the diaphragm blade and the light leakage prevention blade, the diaphragm blade and the light leakage prevention blade can be smoothly operated.

(6) In the 2 nd aperture device according to the present invention, it is preferable that the aperture blade is constituted by the 1 st plate in an elongated body shape having a long axis as a whole, the 1 st fixing projection is provided on one side of the 1 st plate in the long axis direction, and an aperture blade extension portion having an inner peripheral edge formed in substantially the same shape as a part of the shape of the aperture opening when the aperture diameter of the aperture opening is maximized is provided on the other side, and at least a part of the aperture blade extension portion on the outer peripheral side than the inner peripheral edge is constituted so as to be always located on the outer side than the inner peripheral edge of the housing, that is, the inner peripheral edge of the housing or the inner peripheral edge of the drive ring, that is, the inner peripheral edge of the drive ring, and that when the aperture device is observed along the optical axis, a part of the aperture blade extension portion of the aperture blade is overlapped on the light leakage preventing blade located on the opposite side with respect to the optical axis as viewed from the 1 st fixing projection of the aperture blade when the aperture diameter of the aperture is smallest, and a part of the aperture blade extension portion of the aperture blade is overlapped on the intermediate blade located on the opposite side with respect to the optical axis as viewed from the 1 st fixing projection of the aperture blade in a transition of the aperture diameter of the aperture from smallest to largest.

In the 2 nd aperture stop device of the present invention, the aperture blade is provided with an aperture blade extension portion, and when the aperture diameter of the aperture opening is minimum (minimum aperture state), a part of the aperture blade extension portion of the aperture blade is configured to be superposed on the light leakage prevention blade located on the opposite side with respect to the optical axis as viewed from the 1 st fixing projection of the aperture blade.

Therefore, the order of overlapping the blades can be prevented from being changed when the tip end side of the aperture blade extension portion is submerged under the light leakage prevention blade located on the opposite side with respect to the optical axis as viewed from the 1 st fixing projection of the aperture blade.

Further, in a process of transition of the aperture diameter of the diaphragm aperture from the minimum to the maximum, a part of the diaphragm blade extension portion of the diaphragm blade is configured to be superposed on the intermediate blade located on the opposite side with respect to the optical axis as viewed from the 1 st fixing projection of the diaphragm blade. In other words, in the process of the transition of the aperture diameter of the aperture opening from the minimum to the maximum, a part of the aperture blade extension portion of the aperture blade is configured to overlap in such a manner as to be shifted from above the light leakage preventing blade, which is located on the opposite side with respect to the optical axis as viewed from the 1 st fixing projection of the aperture blade, to above the intermediate blade, which is located on the opposite side with respect to the optical axis as viewed from the 1 st fixing projection of the aperture blade.

Therefore, the tip end side of the extended portion of the diaphragm blade is prevented from being formed in the same layer as the diaphragm blade or from being buried under the diaphragm blade located at the lower layer of the intermediate blade on the opposite side of the optical axis as viewed from the 1 st fixing projection of the diaphragm blade, that is, the lower layer of the intermediate blade.

Thus, according to the 2 nd aperture stop of the present invention, the overlapping order of the aperture blades and the light leakage preventing blades can be maintained.

In the 2 nd diaphragm device according to the present invention, at least a portion of the diaphragm blade extension portion on the outer circumferential side of the inner circumferential edge is configured to be always located on the outer side of the inner circumferential edge of the housing, that is, the housing inner circumferential edge or the drive ring inner circumferential edge.

Therefore, the diaphragm blade can be bridged across the opening of the housing by being bridged on the inner peripheral edge of the housing or the inner peripheral edge of the drive ring by the 1 st fixing boss side and the tip end side of the diaphragm blade extension portion, like the double support beams. Therefore, the phenomenon that the tip ends of the plurality of diaphragm blades are woven and rise toward the diaphragm aperture can be prevented. Therefore, the quality of the diaphragm device in appearance can be improved.

(7) In the 1 st or 2 nd diaphragm device of the present invention, it is preferable that the diaphragm blades are formed as a whole by the 1 st plate having an elongated object shape with a long axis, the aperture blade is provided with the 1 st fixing projection on one side of the 1 st plate in the long axis direction, a diaphragm blade extending part is arranged on the other side, the diaphragm blade extending part is provided with an inner peripheral edge, the inner peripheral edge is formed in substantially the same shape as a part of the shape of the diaphragm opening when the opening diameter of the diaphragm opening is maximum, the aperture blade extension portion is further provided with an engaging convex portion configured to be always located outside the inner circumferential edge of the housing, i.e., the housing inner circumferential edge, of the housing or always located outside the inner circumferential edge of the drive ring, i.e., the drive ring inner circumferential edge, and to be engaged with the housing inner circumferential edge.

The stop blade extension portion provided on the stop blade is further provided with an engaging convex portion configured to be always located on the outer side of the inner peripheral edge of the housing, i.e., the housing inner peripheral edge, or the inner peripheral edge of the drive ring, i.e., the drive ring inner peripheral edge, and to be engaged with the housing inner peripheral edge.

Therefore, even when the aperture diameter of the diaphragm aperture is reduced, for example, the diaphragm blades can be bridged over the aperture of the housing or the driving body by the 1 st fixing projection side and the engaging projection on the inner peripheral edge of the housing or the inner peripheral edge of the driving ring like the double support beams. Therefore, the phenomenon that the tip ends of the plurality of diaphragm blades are woven and rise toward the diaphragm aperture can be prevented. Therefore, the quality of the diaphragm device in appearance can be improved.

(8) The lens barrel of the present invention is characterized by accommodating the diaphragm device and the lens according to any one of (1) to (7) above.

(9) An imaging device or a projection device of the present invention is characterized by comprising the aperture device according to any one of the above (1) to (7) or the lens barrel according to the above (8).

Drawings

Fig. 1 is a perspective view illustrating a diaphragm device 10 according to embodiment 1.

Fig. 2 is a plan view showing the diaphragm device 10 according to embodiment 1 for the purpose of explanation.

Fig. 3 is a perspective view showing a main part of the diaphragm device 10 according to embodiment 1.

Fig. 4 is a plan view showing positional relationships among the 1 st fixed boss 120, the 2 nd fixed boss 220, the moving boss 130, the 1 st cam groove 330, the 2 nd cam groove 230, and the like in the diaphragm device 10 according to embodiment 1.

Fig. 5 is a plan view showing a positional relationship among the 1 st fixing boss 120, the 1 st hole 401, the 2 nd fixing boss 220, and the 2 nd hole 402 in the diaphragm device 10 according to embodiment 1.

Fig. 6 is a plan view showing the operation and effects of the diaphragm device 10 according to embodiment 1.

Fig. 7 is a perspective view showing a main part of the diaphragm device 10a according to embodiment 2.

Fig. 8 is a plan view showing the operation and effects of the diaphragm device 10a according to embodiment 2.

Fig. 9 is a schematic diagram illustrating the lens barrel 20 according to embodiment 3 and the imaging device 30 or the projection device 35 according to embodiment 4.

Fig. 10 is a plan view showing a diaphragm device 10b according to modification 1.

Fig. 11 is a plan view showing a diaphragm device 10c according to modification 2.

Fig. 12 is a plan view showing a diaphragm device 10d according to modification 3.

Fig. 13 is a plan view showing a method of fixing the intermediate blade 280a of modification 4 and the intermediate blade 280b of modification 5.

Fig. 14 is a plan view showing a conventional diaphragm device 900 for explanation.

Fig. 15 is a plan view showing an example of a conventional aperture stop device 900 in which the overlapping order of the aperture blade 910 and the leak-light preventing blade 920 is broken.

Detailed Description

Next, the diaphragm device, the lens barrel, the imaging device, or the projection device according to the present invention will be described based on the embodiments shown in the drawings.

(embodiment mode 1)

1. Basic configuration of aperture device 10 according to embodiment 1

Fig. 1 to 2 are diagrams illustrating a diaphragm device 10 according to embodiment 1. Fig. 1(a) is a perspective view of the diaphragm device 10 in an exploded state. Fig. 1(b) is a perspective view of the diaphragm device 10 in an assembled state. Fig. 2 is a plan view of the aperture device 10 viewed along the optical axis OA. Fig. 2(a) is a diagram showing a state in which the aperture blade 100 and the light leakage prevention blade 200 are retracted within the width of the receptacle 400 (the width in the direction perpendicular to the optical axis OA), and shows a state in which the aperture diameter of the aperture (aperture opening) formed by the aperture blade 100 is maximized (fully open state). Fig. 2 c is a diagram showing a state in which the aperture diameter of the diaphragm aperture is minimized (a minimum diaphragm state). Fig. 2(b) is a diagram showing an intermediate aperture state when the aperture blade 100 and the leak-light preventing blade 200 are moved to positions between the fully open state and the minimum aperture state. In fig. 2(a) and 2(c), a pair of the stop blade 100 and the leak-light preventing blade 200 and the 1 st cam groove 330 corresponding thereto are shown, and the other stop blade, the leak-light preventing blade, and the 1 st cam groove are not shown. Further, the cover 500 is attached to the housing 400 for the purpose of preventing the drive ring 300 from coming off.

As shown in fig. 1 and 2, the diaphragm device 10 according to embodiment 1 is configured in a ring shape having an opening 413 when viewed from above along the optical axis OA. The aperture diameter AD of the diaphragm aperture can be changed by projecting a plurality of blades (here, the diaphragm blades 100) inward of the aperture 413 (toward the optical axis OA). By changing the aperture diameter AD of the diaphragm aperture, the amount of light passing in the diaphragm aperture can be adjusted.

The aperture device 10 includes aperture blades 100, light leakage prevention blades 200, a drive ring 300, and a housing 400. The housing 400 is used as a tray, on which a plurality of aperture blades 100 and a plurality of light leakage preventing blades 200 are stacked in an overlapping manner, and on which a drive ring 300 is placed. And, the cover 500 is placed thereon.

As shown in fig. 2(a) to 2(c), the aperture diameter AD of the diaphragm changes while transitioning from the aperture diameter ADf to the aperture diameter ADm to the aperture diameter in the minimum diaphragm state according to the amount of projection of the diaphragm blade 100 into the aperture 413.

2. Detailed structure of diaphragm device according to embodiment 1

(1) Moving protrusion 130 inserted into 1 st cam groove 330 and 2 nd cam groove 230

Fig. 3 is a perspective view showing a main part of the diaphragm device 10 according to embodiment 1.

Fig. 3 shows a pair of the aperture blade 100j and the leak-light preventing blade 200j, and a pair of the aperture blade 100j +1 and the leak-light preventing blade 200j +1 located next to the pair of the aperture blade 100j and the leak-light preventing blade 200 j. The drive ring 300 and the housing 400 are shown with only the portions corresponding to these blades being taken out. The other components are not shown in the drawings. In addition, reference numeral 212 denotes an outer peripheral edge of the 2 nd blade portion 210.

J is a variable for index, and an integer of 1 or more is substituted.

In the following description, for example, the diaphragm blades 100j/100j +1 may be expressed as only the diaphragm blades 100, so that the additional variable j is not described. The same applies to the light leakage prevention blade 200, the 1 st hole 401, the 2 nd hole 402, and the like.

As shown in fig. 3, the diaphragm blade 100 (e.g., the staring diaphragm blade 100j) includes: a 1 st blade portion 110 (see fig. 2a to 2 c) which is formed of a 1 st plate 102 and protrudes inward of the aperture 413 to form a diaphragm aperture so as to block light incident on the diaphragm aperture of the diaphragm device 10; a 1 st fixing projection 120 projecting from the 1 st plate 102 on the one surface F1 in the 1 st direction along the optical axis OA; and a moving projection 130 projecting from the other surface F2 of the 1 st plate 102 in the 2 nd direction opposite to the 1 st direction.

The 1 st plate 102 has light-shielding properties and is made of a material that can slide smoothly in cooperation with other components (the light leakage preventing blade 200, the housing 400, and the like). The 1 st fixing protrusion 120 and the moving protrusion 130 have a shape of a cylinder (cylinder) having a certain radius. The 1 st fixing protrusion 120 is rotatably inserted into the 1 st hole 401j formed in the receiving body 400. That is, the 1 st fixing projection 120 and the 1 st hole 401j are disposed at positions where the rotation axis of the diaphragm blade 100 is disposed. The "fixed" of the 1 st fixing projection 120 means that the position of the projection with respect to the housing is not moved but fixed, and is rotatable on the projection unit.

The light leakage prevention blade 200 (for example, the light leakage prevention blade 200j in fig. 3) includes: a 2 nd blade portion 210 (see also fig. 2(c)) composed of a 2 nd flat plate 202 and adapted to shield a light leakage portion other than the diaphragm aperture of the diaphragm device 10; and a 2 nd fixing projection 220 projecting from the one surface F3 of the 2 nd plate 202 in the 1 st direction. Further, such a light leakage preventing blade 200 is paired with the above-described aperture blade 100.

Here, the "light leakage portion" refers to a portion other than the diaphragm aperture, and refers to a portion that cannot be closed only by the plurality of diaphragm blades. The "light shielding" of the light leakage portion means that the light leakage portion is blocked.

The 2 nd plate 202 is also made of a material that can slide smoothly in cooperation with other components (the diaphragm blade 100, the housing 400, and the like) as in the 1 st plate 102. In addition, the 2 nd fixing projection 220 has a shape of a cylinder (cylinder) having a certain radius. The 2 nd fixing protrusion 220 is rotatably inserted into the 2 nd hole 402j formed in the receiving body 400. That is, the positions where the 2 nd fixing protrusion 220 and the 2 nd hole 402 are disposed are positions where the rotation shaft of the light leakage preventing blade 200 is disposed. The "fixed" of the 2 nd fixing projection 220 means that the position of the projection with respect to the housing is not moved but fixed, and is rotatable on the projection unit.

As shown in fig. 1 to 3, a 1 st cam groove 330 is formed on the drive ring 300. The drive ring 300 is a flat plate of a ring shape whose inner side is opened in a circular shape. In addition, a circular opening is formed by the inner peripheral edge of the drive ring 300, i.e., the drive ring inner peripheral edge 315.

The moving boss 130 is inserted into the 1 st cam groove 330. The 1 st cam groove 330 is configured to have a different distance from the optical axis OA depending on the position of the cam groove. However, the distance from the optical axis OA may have a partially same section when the cam groove is viewed in the circumferential direction.

When such a drive ring 300 rotates about the optical axis OA, the 1 st cam groove 330 moves in the circumferential direction about the optical axis OA. At this time, the moving boss 130 inserted into the 1 st cam groove 330 is rotated around the 1 st fixing boss 120 inserted into the 1 st hole 401. That is, the moving boss 130 is moved in a direction toward the inside of the opening 413 (hereinafter, referred to as an-r direction) or a direction toward the outside of the opening 413 (hereinafter, referred to as an r direction) with the 1 st fixed boss 120 as a rotation center according to a direction in which the drive ring 300 rotates.

Although any method may be used as a method of applying a rotational force to the drive ring 300, a rotational rod 340 that rotates integrally with the drive ring body 310 is provided, and a force is applied to the rotational rod 340 from a rotational force applying means not shown.

As shown in fig. 1 to 3, the housing 400 has an opening 413 on the inner side, and is formed in a circular ring shape as a whole. The housing 400 houses the aperture blade 100, the light leakage preventing blade 200, and the driving ring 300 as described above. A circular opening 413 is formed in the inner peripheral edge 415 of the housing 400.

In the housing 400, n sets (the number of pairs of the aperture blade 100 and the light leakage preventing blade 200) of a pair of the 1 st hole 401 and the 2 nd hole 402 into which the 1 st fixing protrusion 120 and the 2 nd fixing protrusion 220 are respectively inserted are provided corresponding to the pair of the aperture blade 100 and the light leakage preventing blade 200 described above (however, n is an integer of 2 or more).

Further, as shown in fig. 1(a), the receiving body 400 has a cut-out portion 411 formed by cutting out a part of the outer circumferential wall 410 so that the rotating lever 340 of the driving ring 300 can rotate.

The entire aperture device 10 includes n (a plurality of) sets of the aperture blades 100 and the light leakage preventing blades 200 constituting one pair. On the drive ring 300, n (plural) 1 st cam grooves 330 are formed in such a manner as to correspond to the moving bosses 130 provided on each of the diaphragm blades 100, respectively. For example, 11 groups are shown in FIGS. 1 to 3.

As shown in fig. 2(a), 2(c), 3, and the like, the pair of stop blade 100 and leak-light preventing blade 200 are stacked in the order of the stop blade 100 and leak-light preventing blade 200 in the 2 nd direction.

That is, when the 2 nd direction is defined as up and the 1 st direction is defined as down, the stop blade 100j of the "pair of stop blade 100j and leak prevention blade 200 j", the leak prevention blade 200j of the "pair of stop blade 100j and leak prevention blade 200 j", the stop blade 100j +1 of the "pair of stop blade 100j +1 and leak prevention blade 200j + 1" and the leak prevention blade 200j +1 of the "pair of stop blade 100j +1 and leak prevention blade 200j + 1" located beside the pair of stop blade 100j and leak prevention blade 200j are arranged so as to overlap in this order (see fig. 3).

In addition to the above, the 2 nd cam groove 230 is provided on the light leakage preventing blade 200. The 2 nd cam groove 230 is disposed at a position corresponding to the moving boss 130.

The moving boss 130 of the diaphragm blade 100 is inserted into the 2 nd cam groove 230 of the light leakage preventing blade 200 and also inserted into the 1 st cam groove 330 of the drive ring 300.

Further, although the moving boss 130 is "inserted" into the 1 st cam groove 330 and the 2 nd cam groove 230, the moving boss 130 may be inserted only in a part of the depth of the 1 st cam groove 330 (the thickness of the drive ring 300), or may penetrate the 1 st cam groove 330 in addition to the 2 nd cam groove 230. In embodiment 1, the state is substantially the extent of penetration.

(2) Arrangement relationship between the 1 st fixing protrusion 120 and the 2 nd fixing protrusion 220

Fig. 4 is a plan view showing positional relationships among the 1 st fixed boss 120, the 2 nd fixed boss 220, the moving boss 130, the 1 st cam groove 330, the 2 nd cam groove 230, and the like in the diaphragm device 10 according to embodiment 1. Fig. 4(a) shows a pair of the stop blade 100j and the leak-light preventing blade 200j, the 1 st cam groove 330 and the 2 nd cam groove 230 corresponding to these, and the stop blade 100j +1 of the next pair of the stop blade 100j +1 and the leak-light preventing blade 200j + 1. In addition, FIG. 4 shows the aperture blade 100j-1 and the moving protrusion 130' corresponding to the aperture blade 100j-1 among the aperture blade 100j-1 and the leak-light preventing blade 200j-1 constituting the previous pair beside the aperture blade 100j and the leak-light preventing blade 200j constituting the pair. The other aperture blades and the light leakage preventing blades and their corresponding components are not shown in the drawings. Fig. 4(b) shows a case where the housing 400 is provided with a plurality of pairs of the first 1 st hole 401j-1 and the 2 nd hole 402j-1 into which the 1 st fixing projection 120 and the 2 nd fixing projection 220 are inserted, the pair of the 1 st hole 401j and the 2 nd hole 402j, the next pair of the 1 st hole 401j +1 and the 2 nd hole 402j +1, and the like. The other components are not shown in the drawings.