阅读说明：本技术 光量调节装置、摄像装置、摄像系统以及移动体 (Light amount adjustment device, imaging system, and moving object ) 是由 白龙吉 小山高志 徐永旺 于 2017-05-09 设计创作，主要内容包括：光量调节装置可以具备基座部件。光量调节装置可以具备相对于基座部件可旋转地保持的旋转部件。光量调节装置可以具备光量调节部件,其与旋转部件接合,由旋转构件的旋转驱动,并调节通过的光量。与基座部件接触的旋转部件的第一表面区域的表面粗糙度,可以大于不与基座部件接触的旋转部件的第二表面区域的表面粗糙度。(The light amount adjustment device may be provided with a base member. The light amount adjustment device may include a rotation member rotatably held with respect to the base member. The light amount adjustment device may include a light amount adjustment member that is coupled to the rotation member, is driven by rotation of the rotation member, and adjusts the amount of light passing therethrough. The surface roughness of the first surface area of the rotating member that is in contact with the base member may be greater than the surface roughness of the second surface area of the rotating member that is not in contact with the base member.)

1. A light amount adjustment device is characterized by comprising: a rotating member; and

a light amount adjusting member that is engaged with the rotating member, is driven by rotation of the rotating member, and adjusts the amount of light that passes through,

the rotating member has:

a main body portion;

a gear portion provided in the main body and receiving power from a drive source; and

a weight portion provided on the main body portion,

the combined center of gravity of the main body portion, the gear portion, and the weight portion is located closer to the rotation axis of the rotating member than the combined center of gravity of the main body portion and the gear portion.

2. The light amount adjustment device according to claim 1, wherein a distance between a line obtained by projecting a line in a vertical direction of a center of gravity of the rotating member onto a plane perpendicular to a rotation axis of the rotating member and an intersection of the plane and the rotation axis of the rotating member is shorter than a distance between a line obtained by projecting a line in a horizontal direction of the center of gravity of the rotating member onto the plane and the intersection.

3. The light amount adjustment device according to claim 1, wherein a position of a center of gravity of the rotating member is on a rotation axis of the rotating member.

4. The light amount adjustment device according to claim 1, wherein the gear portion has a weight-reduced portion.

5. The light amount adjustment device according to claim 1, further comprising a base member,

the rotation member is rotatably held with respect to the base member,

the first surface area of the rotating member that is in contact with the base member has a surface roughness that is greater than a surface roughness of a second surface area of the rotating member that is not in contact with the base member.

6. The light amount adjustment device according to claim 5, wherein the rotation member is plate-shaped and is provided between the base member and the light amount adjustment member,

the first surface area of the rotation member is included in a face opposite to the base member.

7. The light amount adjustment device according to claim 5, wherein the rotation member is plate-shaped and is provided between the base member and the light amount adjustment member,

the second surface region of the rotating member is included in a face opposite to the light amount adjusting member.

8. The light amount adjustment device according to claim 5, wherein the base member has a convex portion on which the rotation member is rotatably fitted,

the rotary member is plate-shaped and is rotatably fitted to the convex portion of the base member,

the first surface area of the rotary member is included in a face opposite to the convex portion of the base member.

9. The light amount adjustment device according to claim 5, further comprising an elastic member that biases the rotation member.

10. The light amount adjustment device according to claim 9, wherein the elastic member presses the first surface area of the rotation member against the base member.

11. The light amount adjustment device according to claim 9, wherein the base member has a recess that rotatably receives the rotation member,

the elastic member is provided between a side wall of the recess and a side surface of the rotating member opposite to the side wall of the recess.

12. The light amount adjustment device according to claim 9, wherein the base member has a holding portion that rotatably sandwiches and holds the rotation member,

the elastic member is provided between the holding portion and the rotating member.

13. The light amount adjustment device according to claim 9, wherein the rotation member is a plate-like annular member provided between the base member and the light amount adjustment member and having an opening portion,

the base member has a recess for rotatably receiving the rotating member, and a projection provided in the recess and projecting from a bottom surface of the recess so as to be rotatably fitted to the opening,

the first surface area of the rotary member is included in a face opposite to the convex portion of the base member,

the elastic member is provided between a side wall of the recess and a side surface on an outer peripheral side of the rotating member opposed to the side wall of the recess.

14. The light amount adjustment device according to claim 9, wherein the rotation member is a plate-like annular member provided between the base member and the light amount adjustment member and having an opening portion,

the base member has a recess for rotatably receiving the rotating member, and a projection provided in the recess and projecting from a bottom surface of the recess so as to be rotatably fitted to the opening,

the base member has a holding portion provided on the convex portion and rotatably sandwiching and holding the rotating member,

the first surface area of the rotation member is contained in a face opposite the base member,

the elastic member is provided between the holding portion and the rotating member.

15. The light amount adjustment device according to claim 1, wherein the light amount adjustment member is a diaphragm portion including a plurality of diaphragm blades.

16. An imaging device is characterized by comprising: the light amount adjusting device according to any one of claims 1 to 15; and

an image sensor that images light passing through the light amount adjustment device.

17. An imaging system is characterized by comprising: the image pickup apparatus according to claim 16; and

and a support mechanism that supports the image pickup device.

18. A movable body characterized by: an imaging system according to claim 17, and moving the camera.

Technical Field

The invention relates to a light amount adjustment device, an imaging system, and a moving body.

Background

Patent document 1 discloses that the blade surface on the drive ring side on the light-shielding blades is supported by the blade support portion provided in the drive ring, thereby reducing the contact area between the rotating light-shielding blades and the rotating drive ring and reducing the frictional resistance received by the light-shielding blades from the drive ring.

Patent document 1: japanese patent laid-open No. 2012 and 145929.

Disclosure of Invention

A member for adjusting the light amount, such as a diaphragm, provided in the imaging device may move due to an impact, and the light amount may not be appropriately controlled.

The light amount adjustment device according to one aspect of the present invention may include a rotating member. The light amount adjustment device may include a light amount adjustment member that is engaged with the rotating member, is driven by rotation of the rotating member, and adjusts the amount of light passing therethrough. The rotating member may have a main body portion. The rotating member may have a gear portion that is provided on the main body and receives power from the driving source. The rotating member may have a weight portion provided on the main body portion. The position of the combined center of gravity of the main body portion and the gear portion and the weight portion may be closer to the rotation axis of the rotating member than the position of the combined center of gravity of the main body portion and the gear portion.

A distance between a line obtained by projecting a line in the vertical direction of the center of gravity of the rotating member onto a plane perpendicular to the rotation axis of the rotating member and an intersection of the plane and the rotation axis of the rotating member may be shorter than a distance between a line obtained by projecting a line in the horizontal direction of the center of gravity of the rotating member onto the plane and the intersection.

The position of the centre of gravity of the rotating member may be on the axis of rotation of the rotating member.

The gear portion may have a weight-reduced portion.

The light amount adjustment device may further include a base member. The rotation member may be rotatably held with respect to the base member. The surface roughness of the first surface area of the rotating member that is in contact with the base member may be greater than the surface roughness of the second surface area of the rotating member that is not in contact with the base member.

The rotating member may be plate-shaped. The rotation member may be disposed between the base member and the light amount adjustment member. The first surface area of the rotation member may be comprised in a face opposite the base member.

The rotating member may be plate-shaped. The rotation member may be disposed between the base member and the light amount adjustment member. The second surface area of the rotating member may be included in a face opposite to the light amount adjusting member.

The base member may have a projection on which the rotation member is rotatably fitted. The rotating member may be plate-shaped. The rotation member may be rotatably fitted to the convex portion of the base member. The first surface area of the rotation member may be included in a face opposite the convex portion of the base member.

The light amount adjustment device may include an elastic member that biases the rotating member.

The resilient member may press the first surface area of the rotation member against the base member.

The base member may have a recess that rotatably receives the rotating member. The elastic member may be provided between a side wall of the recess and a side surface of the rotating member opposite to the side wall of the recess.

The base member may have a holding portion that rotatably sandwiches and holds the rotating member. The elastic member may be provided between the holding portion and the rotating member.

The rotation member may be disposed between the base member and the light amount adjustment member. The rotating member may be a plate-like annular member having an opening. The base member may have a recess that rotatably receives the rotating member. The base member may have a convex portion provided in the concave portion and protruding from a bottom surface of the concave portion so as to be rotatably fitted to the opening portion. The first surface area of the rotation member may be included in a face opposite the convex portion of the base member. The elastic member may be provided between a side wall of the recess and a side surface of the rotating member on the outer peripheral side opposed to the side wall of the recess.

The rotation member may be disposed between the base member and the light amount adjustment member. The rotating member may be a plate-like annular member having an opening. The base member may have a recess that rotatably receives the rotating member. The base member may have a convex portion provided in the concave portion and protruding from a bottom surface of the concave portion so as to be rotatably fitted to the opening portion. The base member may have a holding portion that is provided on the convex portion and that rotatably sandwiches and holds the rotating member. The first surface area of the rotation member may be comprised in a face opposite the base member. The elastic member may be provided between the holding portion and the rotating member.

The light amount adjusting member may be a diaphragm portion including a plurality of diaphragm blades.

An image pickup apparatus according to an aspect of the present invention may include the light amount adjustment device. The image pickup device may be provided with an image sensor that images light passing through the light amount adjustment device.

An imaging system according to an aspect of the present invention may include the imaging device. The imaging system may include a support mechanism that supports the imaging device.

A moving object according to an aspect of the present invention includes the imaging system and moves.

According to one aspect of the present invention, it is possible to prevent the light amount adjustment member from being driven due to unnecessary rotation of the rotation member, and thus the light amount from being unable to be appropriately controlled.

The above summary of the present invention is not exhaustive of all features of the present invention. Sub-combinations of these sets of features may also constitute the invention.

Drawings

Fig. 1 is a diagram showing an example of the external appearance of an unmanned aerial vehicle and a remote operation device.

Fig. 2 is a diagram showing an example of an external perspective view of the image pickup apparatus.

Fig. 3 is a diagram showing one example of an exploded perspective view of the light amount adjustment device.

Fig. 4 is an exploded perspective view of the light amount adjustment device in a state where the cover is removed.

Fig. 5 is a diagram for explaining a positional relationship between the rotation axis and the center of gravity of the rotating member.

Fig. 6 is a diagram showing one example of an external perspective view of the rotating member.

Fig. 7 is a diagram showing one example of an external perspective view of the rotating member.

Fig. 8 is a diagram showing one example of an external perspective view of the rotating member.

Fig. 9 is an example of an external perspective view of the light amount adjustment device in a state where the cover is removed.

Fig. 10 is a diagram showing an example of an exploded perspective view of the base member and the rotating member.

Fig. 11 is a diagram showing one example of an external perspective view of a base member equipped with a rotation member.

Fig. 12 is a diagram showing one example of an external perspective view of a base member equipped with a rotation member.

Fig. 13 is a view showing an enlarged view of the vicinity of the holding portion in the cross section taken along line a-a of fig. 12.

Description of the symbols:

10 UAV

20 UAV body

50 universal support

60 image pickup device

100 image pickup device

200 light quantity adjusting device

210 base member

212 recess

214 convex part

216 supporting pin

217 fixed pin

218 opening part

219 holding part

220 rotating part

221 body part

222 opening part

224 gear part

226 counterweight

227 weight reduction part

2201 Flange part

2202 notch part

2221 guide pin

230 diaphragm part

232 aperture blade

240 cover

250 step motor

252 gear part

260 elastic member

262 elastic component

300 remote operation device

Detailed Description

The present invention will be described below with reference to embodiments thereof, but the following embodiments do not limit the invention according to the claims. Moreover, all combinations of features described in the embodiments are not necessarily essential to the solution of the invention. It will be apparent to those skilled in the art that various changes and modifications can be made in the following embodiments. It is apparent from the description of the claims that the modifications and improvements can be included in the technical scope of the present invention.

The claims, the specification, the drawings, and the abstract of the specification contain matters to be protected by copyright. The copyright owner cannot objection to the facsimile reproduction by anyone of the files, as represented by the patent office documents or records. However, in other cases, the copyright of everything is reserved.

Various embodiments of the present invention may be described with reference to flow diagrams and block diagrams, where blocks may represent (1) stages of a process to perform an operation or (2) a "part" of a device that has the role of performing an operation. Certain stages and "sections" may be implemented by programmable circuits and/or processors. The dedicated circuitry may comprise digital and/or analog hardware circuitry. May include Integrated Circuits (ICs) and/or discrete circuits. The programmable circuitry may comprise reconfigurable hardware circuitry. The reconfigurable hardware circuit may include logical AND, logical OR, logical XOR, logical NAND, logical NOR, and other logical operations, flip-flops, registers, Field Programmable Gate Arrays (FPGAs), Programmable Logic Arrays (PLAs), etc. memory elements.

The computer readable medium may comprise any tangible device that can store instructions for execution by a suitable device. As a result, a computer-readable medium having stored thereon instructions that are executable to create a means for implementing the operations specified in the flowchart or block diagram. As examples of the computer readable medium, an electronic storage medium, a magnetic storage medium, an optical storage medium, an electromagnetic storage medium, a semiconductor storage medium, and the like may be included. As more specific examples of the computer-readable medium, floppy disks (registered trademark), floppy disks, hard disks, Random Access Memories (RAMs), Read Only Memories (ROMs), erasable programmable read only memories (EPROMs or flash memories), Electrically Erasable Programmable Read Only Memories (EEPROMs), Static Random Access Memories (SRAMs), compact disc read only memories (CD-ROMs), Digital Versatile Discs (DVDs), blu-Ray (RTM) discs, memory sticks, integrated circuit cards, and the like may be included.

Computer readable instructions may include any one of source code or object code described by any combination of one or more programming languages. The source code or object code comprises a conventional procedural programming language. Conventional procedural programming languages may be assembly instructions, Instruction Set Architecture (ISA) instructions, machine-related instructions, microcode, firmware instructions, state setting data, or Smalltalk, JAVA (registered trademark), C + +, or the like, and the "C" programming language, or similar programming languages. The computer readable instructions may be provided to a processor or programmable circuitry of a general purpose computer, special purpose computer, or other programmable data processing apparatus, either locally or via a Wide Area Network (WAN), such as a Local Area Network (LAN), the internet, or the like. A processor or programmable circuit may execute the computer readable instructions to create means for implementing the operations specified in the flowchart or block diagram. Examples of processors include computer processors, processing units, microprocessors, digital signal processors, controllers, microcontrollers, and the like.

Fig. 1 shows an example of the appearance of an Unmanned Aerial Vehicle (UAV)10 and a remote operation device 300. The UAV10 includes a UAV main body 20, a gimbal 50, a plurality of imaging devices 60, and an imaging device 100. The gimbal 50 and the imaging apparatus 100 are examples of an imaging system. The UAV10 is one example of a mobile body propelled by propulsion. The concept of a mobile body includes, in addition to the UAV, a flying body such as another aircraft that moves in the air, a vehicle that moves on the ground, a ship that moves on water, and the like.

The UAV main body 20 includes a plurality of rotors. Multiple rotors are one example of a propulsion section. The UAV body 20 flies the UAV10 by controlling the rotation of the plurality of rotors. The UAV body 20 uses, for example, four rotors to fly the UAV 10. The number of rotors is not limited to four. Further, the UAV10 may also be a fixed wing aircraft without a rotor.

The imaging apparatus 100 is an imaging camera that captures an object included in a desired imaging range. The gimbal 50 supports the image pickup apparatus 100 so that the posture of the image pickup apparatus 100 can be changed. The gimbal 50 rotatably supports the image pickup apparatus 100. The gimbal 50 is an example of a support mechanism. For example, the gimbal 50 rotatably supports the image pickup apparatus 100 with a pitch axis using an actuator. The gimbal 50 supports the imaging device 100 so as to be able to rotate around the roll axis and the yaw axis, respectively, using actuators. The gimbal 50 can change the attitude of the imaging apparatus 100 by rotating the imaging apparatus 100 about at least one of the yaw axis, the pitch axis, and the roll axis.

The plurality of imaging devices 60 are sensing cameras that image the surroundings of the UAV10 in order to control the flight of the UAV 10. Two cameras 60 may be provided at the nose, i.e., the front, of the UAV 10. Also, two other cameras 60 may be provided on the bottom surface of the UAV 10. The two image pickup devices 60 on the front side may be paired to function as a so-called stereo camera. The two imaging devices 60 on the bottom surface side may also be paired to function as a stereo camera. Three-dimensional spatial data around the UAV10 may be generated based on images taken by the plurality of cameras 60. The number of the imaging devices 60 provided in the UAV10 is not limited to four. The UAV10 may include at least one imaging device 60. The UAV10 may also include at least one camera 60 on the nose, tail, sides, bottom, and top of the UAV 10. The angle of view settable in the image pickup device 60 may be larger than the angle of view settable in the image pickup device 100. That is, the photographing range of the image pickup device 60 may be larger than that of the image pickup device 100. The imaging device 60 may also have a single focus lens or a fisheye lens.

The remote operation device 300 communicates with the UAV10 to remotely operate the UAV 10. The remote operation device 300 may be in wireless communication with the UAV 10. The remote operation device 300 transmits drive information indicating various drive commands related to the movement of the UAV10, such as ascending, descending, accelerating, decelerating, advancing, retreating, and rotating, to the UAV 10. The actuation information includes, for example, actuation information that elevates the UAV 10. The actuation information may indicate the altitude at which the UAV10 should be located. The UAV10 moves to be located at an altitude indicated by the driving information received from the remote operation device 300.

Fig. 2 is an example of an external perspective view of the image pickup apparatus 100. The imaging apparatus 100 may be subjected to a large impact depending on the use environment. For example, the imaging apparatus 100 mounted on the UAV10 is susceptible to a large impact when the UAV10 lands or the like. Due to such an impact, a member provided in a light amount adjustment device for adjusting the light amount, such as a diaphragm provided in the imaging device 100, may move, and the light amount may not be appropriately adjusted.

Fig. 3 shows one example of an exploded perspective view of the light amount adjustment device 200. Fig. 4 shows an example of an external perspective view of the light amount adjustment device 200 in a state where the cover 240 is removed.

The light amount adjustment device 200 may be provided on the image pickup device 100. The light amount adjustment device 200 may also be provided on the image pickup device 60. The light amount adjustment device 200 includes a base member 210, a rotation member 220, an aperture portion 230, a cover 240, and a stepping motor 250. The rotation member 220 is rotatably held with respect to the base member 210. The rotation member 220 is disposed between the base member 210 and the aperture portion 230. The rotating member 220 is a plate-like annular member having an opening 222. The rotating member 220 includes an annular body 221 and a gear portion 224 that receives power from the stepping motor 250. The base member 210 has a recess 212 that rotatably receives the rotating member 220. The base member 210 has a boss 214 on which a rotation member 220 is rotatably fitted. The protrusion 214 is disposed in the recess 212 and protrudes from the bottom surface of the recess 212 so as to be rotatably fitted to the opening portion 222 of the rotating member 220. The convex portion 214 has an opening 218 in the center thereof through which light passes.

The diaphragm portion 230 is engaged with the rotary member 220, receives power from the stepping motor 250, and is driven by the rotation of the rotary member 220 to adjust the amount of light passing therethrough. The diaphragm portion 230 is an example of a light amount adjusting member. The diaphragm portion 230 has a plurality of diaphragm blades 232. The diaphragm blade 232 has a through hole 233 and a guide groove 234. The diaphragm blade 232 is rotatably supported on the base member 210 by inserting the support pin 216 provided on the base member 210 into the through hole 233. The guide pin 2221 provided on the rotating member 220 is guided by the guide groove 234. In a state where the plurality of diaphragm blades 232 are overlapped, the diaphragm aperture 235 is formed at the inner edge of each of the plurality of diaphragm blades 232. The guide pin 2221 moves along the guide groove 234 in response to the rotation of the rotating member 220 receiving power from the stepping motor 250. Thereby, the diaphragm blades 232 rotate about the through holes 233, and the size of the diaphragm aperture 235 changes.

The cover 240 is fixed to the base member 210 with the rotary member 220 and the diaphragm 230 interposed between the cover and the base member 210. The cover 240 has a through hole 243. The base member 210 has fixing pins 217 and the fixing pins 217 are inserted into the through holes 243, so that the cover 240 is positioned and fixed with respect to the base member 210. The drive shaft of the stepping motor 250 has a gear portion 252. The stepper motor 250 is retained on the base member 210. The gear portion 224 of the rotating member 220 engages with the gear portion 252, and the rotating member 220 is rotated by driving of the stepping motor 250.

Here, in order to prevent the rotating member 220 from being rotated by an impact or the like, it is conceivable to place the stepping motor 250 in an energized state. However, in order to place the stepping motor 250 in an energized state, power is required. In an environment where the UAV10 or the like is susceptible to a large impact, when the imaging apparatus 100 is used, it may be necessary to continuously supply a large amount of electric power to the stepping motor 250 in order to prevent the rotating member 220 from moving due to the impact. On the other hand, for example, for a device that is desired to be able to continue driving with limited electric power, such as the UAV10, it is desirable to suppress consumption of electric power as much as possible. Therefore, the light amount adjustment device 200 according to the present embodiment prevents the rotation member 220 from rotating due to an impact while suppressing power consumption.

Here, if the center of gravity of the rotating member 220 is near on the rotation axis of the rotating member 220, the rotating member 220 is difficult to rotate. However, as described above, the rotating member 220 has the gear portion 224 in addition to the body portion 221. Since the gear portion 224 is provided, the center of gravity of the rotating member 220 may be deviated from the rotation axis. Therefore, the rotating member 220 according to the present embodiment further includes a weight 226 provided on the body 221. The weight portion 226 may be provided in consideration of the weight of the gear portion 224. The weight portion 226 may be provided at a position facing the gear portion 224 via the opening portion 222. The weight portion 224 may have the same weight as the gear portion 226. By providing the weight 226, the center of gravity of the rotating member 220 is brought close to the rotation axis of the rotating member 220. The position of the combined center of gravity of the body portion 221, the gear portion 224, and the weight portion 226 is closer to the rotation axis of the rotating member 220 than the position of the combined center of gravity of the body portion 221 and the gear portion 224. The position of the center of gravity of the rotating member 220 may be on or near the axis of rotation of the rotating member. The weight portion 226 is formed of a plurality of small pieces, which may be scattered on the body portion 221.

The imaging apparatus 100 may be used in a posture in which the optical axis does not face the horizontal direction. Even in this case, if the center of gravity of the rotating member 220 is located on or near the rotating shaft of the rotating member, the rotating member 220 can be made less likely to rotate due to impact or the like. As shown in fig. 5, a distance 406 between a line 404 obtained by projecting a line 401 in the vertical direction of the center of gravity 400 of the rotating member 220 onto a plane 403 perpendicular to the rotation axis 402 of the rotating member 220 and an intersection 405 of the plane 403 and the rotation axis 402 of the rotating member 220 may be shorter than a distance 412 between a line 411 obtained by projecting a line 410 in the horizontal direction of the center of gravity 400 of the rotating member 220 onto the plane 403 and the intersection 405. This makes it possible to prevent the rotation member 220 from being rotated by impact or the like.

In addition to adjusting the position of the center of gravity of the rotating member 220, the rotating member 220 may also be made difficult to rotate with respect to the base member 210. A first surface area of rotation member 220 that is in contact with base member 210 may have a surface roughness greater than a second surface area of rotation member 220 that is not in contact with base member 210, such that rotation member 220 is difficult to rotate with respect to base member 210. By making the surface of the rotating member 220 in contact with the base member 210 a rough surface, the rotating member 220 can be made less likely to rotate relative to the base member 210.

Fig. 6 is an example of a perspective view of the rotating member 220 viewed from the surface side facing the base member 210. A first surface area of rotational member 220 may be included in a face 223 opposite base member 210. The first surface area may be at least a portion of the face 223. A first surface area of the rotation member 220 may be included in a face 225 opposite the protrusion 214 of the base member 210. The first surface area may be at least a portion of the face 225. The first surface area may be at least a portion of the face 223 and the face 225. The second surface area of the rotating member 220 may be included in a face (a face on the back side of the face 223) opposing the diaphragm portion 230.

As shown in fig. 7, the rotating member 220 may have a weight 226, in addition to the rough surfaces of the surfaces 223 and 225 of the rotating member 220 that contact the base member 210. As shown in fig. 8, the gear portion 224 may have a weight-reduced portion 227. By forming the weight reduction portion 227 in the gear portion 224, the weight of the gear portion 224 and the weight of the weight portion 226 can be reduced. By forming the weight reduction portion 227 in the gear portion 224, it is possible to prevent so-called "sink holes" such as dimples or dents from being generated in the gear portion 224 due to shrinkage at the time of molding the rotating member 220.

In addition to the weight 226 provided on the rotating member 220, the light amount adjustment device 200 includes an elastic member that biases the rotating member 220, and thus can suppress the rotation of the rotating member 220. The elastic member may press the surface roughened first surface area of the rotation member against the base member 210. The elastic member may be disposed between a sidewall of the recess 212 and a side of the rotating member 220 opposite to the sidewall of the recess 212. For example, as shown in fig. 9, the elastic member 260 may be disposed between the side wall 2111 of the pocket 212 and the side surface 229 of the rotating member 220 opposite to the side wall 2111 of the pocket 212. The elastic member 260 may press a face opposite to the convex portion 214 of the base member 210 against a side face of the outer side of the convex portion 214 of the base member 210. The elastic member for urging the rotating member 220 may be provided at another position as long as the rotation of the rotating member 220 can be suppressed.

As shown in fig. 10, the base member 210 may have a holding portion 219 that rotatably sandwiches and holds the rotating member 220. The holding portion 219 may be provided on the convex portion 214. The holding portion 219 may be formed to protrude from the outer side surface of the convex portion 214. A plurality of holding portions 219 may be provided on the convex portion 214. The plurality of holding portions 219 may be provided on the convex portion 214 in a radial shape. The rotating member 220 may have a flange 2201 on the inner side surface thereof to engage with the holding part 219. The holding portion 219 and the flange portion 2201 can function as a so-called bayonet mechanism. The rotating member 220 is coupled to the flange portion 2201 at the inner side and has a notch portion 2202. The rotating member 220 is rotatably held by the base member 210 by being accommodated in the recess 212 via the notch 2202 and rotated. Fig. 11 shows a state in which the rotating member 220 is accommodated in the recess 212.

Fig. 12 shows another example of an external perspective view of the light amount adjustment device 200 in a state where the cover 240 is removed. Fig. 13 shows an enlarged view of the vicinity of the holding portion 219 in a cross section taken along line a-a of fig. 12. As shown in fig. 13, the elastic member 262 may be disposed between the holding part 219 and the rotating member 220. The elastic member 262 may be disposed between the holding portion 219 and the flange portion 2201. The elastic member 262 biases the rotating member 220 to suppress the rotation of the rotating member 220. The elastic member 262 presses the surface rough first surface area of the rotation member 220 opposite to the base member 210 against the base member 210. This can suppress rotation of the rotating member 220. The light amount adjustment device 200 may include at least one of an elastic member 260 and an elastic member 262.

As described above, according to the light amount adjustment device 200 of the present embodiment, it is possible to prevent the stop blade 232 from being rotated by the rotation of the rotating member 220 due to the impact and the light amount from being adjusted improperly. It is possible to suppress unnecessary rotation of the diaphragm blades 232 while suppressing the supply of electric power to the stepping motor 250.

It should be noted that the execution order of the operations, the sequence, the steps, the stages, and the like in the devices, systems, programs, and methods shown in the claims, the description, and the drawings of the specification can be realized in any order as long as "before …", "in advance", and the like are not particularly explicitly indicated, and as long as the output of the preceding process is not used in the following process. The operational flow in the claims, the specification, and the drawings of the specification is described using "first", "next", and the like for convenience, but it is not necessarily meant to be performed in this order.

[ item 1]

A light amount adjusting device includes: a base member;

a rotating member rotatably held with respect to the base member;

a light amount adjusting member that is engaged with the rotating member, is driven by rotation of the rotating member, and adjusts the amount of light that passes through,

the surface roughness of a first surface area of the rotating member that is in contact with the base member is greater than the surface roughness of a second surface area of the rotating member that is not in contact with the base member.

[ item 2]

The light amount adjustment device according to item 1, wherein the rotary member is plate-shaped and is provided between the base member and the light amount adjustment member,

the first surface region of the rotating member is included in a surface facing the base member.

[ item 3]

The light amount adjustment device according to item 1, wherein the rotary member is plate-shaped and is provided between the base member and the light amount adjustment member,

the second surface region of the rotating member is included in a surface facing the base member.

[ item 4]

The light amount adjustment device according to item 1, wherein the base member has a convex portion on which the rotation member is rotatably fitted,

the rotary member is plate-shaped and rotatably fitted to the convex portion of the base member,

the first surface region of the rotating member is included in a surface facing the convex portion of the base member.

[ item 5]

The light amount adjustment device according to item 1, further comprising an elastic member that biases the rotating member.

[ item 6]

The light amount adjustment device according to item 5, wherein the elastic member presses the first surface area of the rotation member against the base member.

[ item 7]

The light amount adjustment device according to item 5, wherein the base member has a recess for rotatably receiving the rotation member,

the elastic member is provided between a side wall of the recess and a side surface of the rotating member facing the side wall of the recess.

[ item 8]

The light amount adjustment device according to item 5, wherein the base member has a holding portion that rotatably sandwiches and holds the rotation member,

the elastic member is provided between the holding portion and the rotating member.

[ item 9]

The light amount adjustment device according to item 5, wherein the rotating member is a plate-like annular member provided between the base member and the light amount adjustment member and having an opening,

the base member has a recess for rotatably receiving the rotating member and a projection provided in the recess and projecting from a bottom surface of the recess so as to be rotatably fitted in the opening,

the first surface region of the rotating member is included in a surface facing the convex portion of the base member,

the elastic member is provided between a side wall of the recess and a side surface of the rotating member on the outer peripheral side facing the side wall of the recess.

[ item 10]

The light amount adjustment device according to item 5, wherein the rotating member is a plate-like annular member provided between the base member and the light amount adjustment member and having an opening,

the base member has a recess for rotatably receiving the rotating member and a projection provided in the recess and projecting from a bottom surface of the recess so as to be rotatably fitted in the opening,

the base member has a holding portion provided on the convex portion and rotatably holding the rotary member,

the first surface region of the rotating member is included in a surface facing the base member,

the elastic member is provided between the holding portion and the rotating member.

[ item 11]

The light amount adjustment device according to item 1, wherein the rotating member includes:

a main body portion;

a gear portion provided in the main body and receiving power from a drive source; and

a weight portion provided on the main body portion,

the combined center of gravity of the main body, the gear portion, and the weight portion is located closer to the rotation axis of the rotating member than the combined center of gravity of the main body and the gear portion.

[ item 12]

The light quantity adjusting device according to item 1, wherein the light quantity adjusting means is a diaphragm portion including a plurality of diaphragm blades.

[ item 13]

A light amount adjusting device includes: a rotating member;

a light amount adjusting member that is engaged with the rotating member, is driven by rotation of the rotating member, and adjusts the amount of light that passes through; and

and an elastic member that biases the rotating member to suppress rotation of the rotating member.

[ item 14]

The light amount adjustment device according to item 13, further comprising a base member,

the rotating member is rotatably held with respect to the base member,

the elastic member is provided between the base member and the rotating member.

[ item 15]

The light amount adjustment device according to item 14, wherein the base member has a recess for rotatably receiving the rotation member,

the elastic member is provided between a side wall of the recess and a side surface of the rotating member facing the side wall of the recess.

[ item 16]

The light amount adjustment device according to item 14, wherein the base member has a holding portion that rotatably sandwiches and holds the rotation member,

the elastic member is provided between the holding portion and the rotating member.

[ item 17]

The light amount adjustment device according to item 15, wherein the rotation member is a plate-like annular member provided between the base member and the light amount adjustment member and having an opening,

the base member has a recess for rotatably receiving the rotating member and a projection provided in the recess and projecting from a bottom surface of the recess so as to be rotatably fitted in the opening,

the elastic member is provided between a side wall of the recess and a side surface of the rotating member on the outer peripheral side facing the side wall of the recess.

[ item 18]

The light amount adjustment device according to item 15, wherein the rotation member is a plate-like annular member provided between the base member and the light amount adjustment member and having an opening,

the base member has a recess for rotatably receiving the rotating member and a projection provided in the recess and projecting from a bottom surface of the recess so as to be rotatably fitted in the opening,

the base member has a holding portion provided on the convex portion and rotatably holding the rotary member,

the elastic member is provided between the holding portion and the rotating member.

[ item 19]

The light amount adjustment device according to item 13, wherein the rotating member includes:

a main body portion;

a gear portion provided in the main body and receiving power from a drive source; and

a weight portion provided on the main body portion,

the combined center of gravity of the main body, the gear portion, and the weight portion is located closer to the rotation axis of the rotating member than the combined center of gravity of the main body and the gear portion.

[ item 20]

A light amount adjusting device includes: a rotating member;

a light amount adjusting member that is engaged with the rotating member, is driven by rotation of the rotating member, and adjusts the amount of light that passes through,

the rotating member includes:

a main body portion;

a gear portion provided in the main body and receiving power from a drive source; and

a weight portion provided on the main body portion,

the combined center of gravity of the main body, the gear portion, and the weight portion is located closer to the rotation axis of the rotating member than the combined center of gravity of the main body and the gear portion.

[ item 21]

The light quantity adjusting device according to item 20, wherein a distance between a line obtained by projecting a line in a vertical direction passing through a center of gravity of the rotating member onto a plane perpendicular to a rotation axis of the rotating member and an intersection of the plane and the rotation axis of the rotating member is shorter than a distance between a line obtained by projecting a line in a horizontal direction passing through the center of gravity of the rotating member onto the plane and the intersection.

[ item 22]

The light quantity adjusting device according to item 20, wherein a center of gravity of the rotating member is located on a rotation axis of the rotating member.

[ item 23]

The light amount adjustment device according to item 20, wherein the gear portion has a weight-reduced portion.

[ item 24]

An imaging device includes: the light amount adjustment device according to any one of items 1 to 23; and

an image sensor that images light passing through the light amount adjustment device.

[ item 25]

An imaging system includes: the imaging device described in item 24; and

and a support mechanism that supports the image pickup device.

[ item 26]

A mobile body which is provided with the imaging system described in item 25 and moves.