阅读说明：本技术 光束控制部件、发光装置、面光源装置及显示装置 (Flux control member, light emitting device, planar light source device and display device ) 是由 持田俊彦 于 2018-04-19 设计创作，主要内容包括：本发明的光束控制部件具有入射面、出射面和多个凸条。多个凸条相对于中心轴大致垂直地配置。在入射面的与中心轴垂直的剖面为椭圆形时,多个凸条的至少一部分在该椭圆的短轴方向上沿着短轴方向配置在凹部的外侧。在出射面的剖面为椭圆形时,多个凸条的至少一部分在该椭圆的长轴方向上沿着长轴方向配置在凹部的外侧。(Flux control member of the invention has the plane of incidence, exit facet and multiple raised lines.Multiple raised lines are generally perpendicularly configured relative to central axis.When the section of the plane of incidence and central axis is ellipse, at least part of multiple raised lines is configured along short-axis direction in the outside of recess portion on the elliptical short-axis direction.When the section of exit facet is ellipse, at least part of multiple raised lines is configured along long axis direction in the outside of recess portion on the elliptical long axis direction.)

1. a kind of flux control member controls the light distribution of the light projected from light-emitting component, comprising:

The plane of incidence is the interior table for the recess portion that overleaf side configures in a manner of intersecting with the central axis of the flux control member Face keeps the light projected from the light-emitting component incident；

Exit facet is configured at face side in a manner of intersecting with the central axis, and keeps the light by the plane of incidence incidence outside It projects in portion；And

Multiple raised lines, respectively include the first inclined surface, the second inclined surface and are configured at first inclined surface inclining with described second Crest line between inclined-plane, and it is configured at back side,

The multiple raised line is generally perpendicularly configured relative to the central axis.

2. flux control member as described in claim 1, wherein

At least one of the plane of incidence and the exit facet are ellipse with the section of the central axis,

At least part of the multiple raised line, when the section of the plane of incidence is ellipse, in the elliptical short axle It is configured along the short-axis direction in the outside of the recess portion on direction, when the section of the exit facet is ellipse, It is configured along the long axis direction in the outside of the recess portion on the elliptical long axis direction.

3. flux control member as claimed in claim 2, wherein

The section of the plane of incidence and the section of the exit facet are all ellipses,

Elliptical long axis in the section of the plane of incidence and the elliptical short axle in the section of the exit facet are flat Row.

4. the flux control member as described in any one of claims 1 to 3, wherein

The multiple raised line is configured to put in the outer edge of the back side of the flux control member centered on the central axis Penetrate shape.

5. a kind of light emitting device, includes

Substrate；

Light-emitting component, configuration is on the substrate；And

Configuration on the substrate, flux control member described in any one of Claims 1 to 4.

6. light emitting device as claimed in claim 5, wherein

Also there is reflection suppression portion, which is used in carrying out from light-emitting component injection, by the exit facet The reflection for the light that portion reflects and projects from the back side of the flux control member is inhibited,

At least one of the plane of incidence and the exit facet are ellipse with the section of the central axis,

The reflection suppression portion, when the section of the plane of incidence is ellipse, with upper in the elliptical short-axis direction In the mode more more outward than the recess portion, configure on the substrate, when the section of the exit facet is ellipse, To be located at the mode more more outward than the recess portion on the elliptical long axis direction, configuration is on the substrate.

7. a kind of planar light source device, includes

Claim 5 or light emitting device as claimed in claim 6；And

Light diffusion part, the light diffusion part make the light diffusion projected from the light emitting device and transmission.

8. a kind of display device, includes

Planar light source device as claimed in claim 7；And

Display unit, the illuminated light projected from the planar light source device of the display unit.

Technical field

The flux control member that is controlled the present invention relates to the light distribution to the light projected from light-emitting component has the light beam Light emitting device, planar light source device and the display device of control unit.

Background technique

In the transmission-types image display device such as liquid crystal display device, use the planar light source device of straight-down negative as back sometimes Light source.In recent years, begin to use the planar light source device with a plurality of light-emitting elements as the straight-down negative of light source.

For example, the planar light source device of straight-down negative have substrate, a plurality of light-emitting elements, multiple flux control members (lens) and Light diffusion part.Light-emitting component is, for example, the light emitting diodes such as white light-emitting diode (LED).A plurality of light-emitting elements are rectangularly It is configured on substrate.Being configured on each light-emitting component will be from the light that each light-emitting component projects to the face Directional Extension of substrate Flux control member.The light projected from flux control member is diffused by light diffusion part, in planar irradiate illuminated component (such as Liquid crystal display panel).

Figure 1A~Fig. 1 C is the figure for indicating the structure of previous flux control member.Figure 1A is observed from the back side vertical Body figure, Figure 1B are sectional stereograms observed from the back side, and Fig. 1 C is sectional view.In addition, being omitted and matching in Figure 1A and Figure 1B It is placed in the foot section of back side.As shown in Figure 1A~Fig. 1 C, previous flux control member 20 has the plane of incidence 22, exit facet 24.The plane of incidence 22 is to make in the inner surface with the first recess portion formed on the relatively configured back side of light-emitting component from luminous member The light that part projects is incident.Exit facet 24 is configured at the opposite side of the plane of incidence 22, makes to project from the incident light of the plane of incidence 22 to outside.

Fig. 2A and Fig. 2 B is the index path of flux control member 20.Fig. 2A is with 30 ° of the angle of emergence hairs from light-emitting component 10 The index path for the light that the center of smooth surface is projected, Fig. 2 B are projected with the center of 40 ° of the angle of emergence light-emitting surfaces from light-emitting component 10 Light index path.Here, " angle of emergence " refers to angle (figure of the emitted light relative to the optical axis OA of light-emitting component 10 The θ of 2A).In addition, also omiting the foot section for being configured at back side in Fig. 2A and Fig. 2 B.

As shown in Figure 2 A and 2 B, flux control member 20 is incident on by the plane of incidence 22 from the light that light-emitting component 10 projects It is internal.The light for being incident on the inside of flux control member 20 reaches exit facet 24.It reaches most in the light of exit facet 24 Light injects to external (arrow of solid line) from exit facet 24.At this point, being penetrated after being reflected from the light that exit facet 24 projects by exit facet 24 Out, and its direction of travel is controlled.On the other hand, the light for reaching another part in the light of exit facet 24 is reflected by exit facet 24 (Fresnel reflection) reaches the back side 26 (arrow of dotted line).Reach the back side 26 light in a part light by the back side 26 into In the case where row internal reflection, the light quantity towards the surface of flux control member 20 is superfluous, so irradiated from light emitting device Non-uniform distribution (luminance nonuniformity) is generated in the luminance of light.In addition, the case where the light for reaching the back side 26 is projected from the back side 26 Under, a part of emitted light is absorbed by substrate, so the utilization efficiency of light reduces, another part of emitted light is by base Plate reflects and becomes uncontrollable light, so light distribution characteristic reduces.Therefore, in patent document 1, propose and be able to solve this The flux control member of problem.

Fig. 3 A~Fig. 3 C is the figure for indicating the structure for the flux control member 30 recorded in patent document 1.Fig. 3 A is from back The perspective view that surface side is observed, Fig. 3 B are sectional stereograms observed from the back side, and Fig. 3 C is sectional view.In addition, in Fig. 3 A In Fig. 3 B, the foot section for being configured at back side is omitted.As shown in Fig. 3 A~Fig. 3 C, the light beam recorded in patent document 1 In control unit 30, overleaf 26 be formed with the second recess portion, which has inclined surface 32 on the outside, inside have with Central axis CA substantially parallel face 34.Central axis CA rotational symmetry (circle pair of the inclined surface 32 relative to flux control member 30 Claim), and relative to the dummy line orthogonal with central axis CA with defined angle (such as 45 °) inclination.

Fig. 4 A and Fig. 4 B are the index paths of flux control member 30.Fig. 4 A is with 30 ° of the angle of emergence hairs from light-emitting component 10 The index path for the light that the center of smooth surface is projected, Fig. 4 B are projected with the center of 40 ° of the angle of emergence light-emitting surfaces from light-emitting component 10 Light index path.In addition, also omiting the foot section for being configured at back side in Fig. 4 A and Fig. 4 B.Such as Fig. 4 A and Fig. 4 B institute Show, the defined region on the light arrival back side 26 after internal reflection is carried out by exit facet 24.By in above-mentioned defined region Inclined surface 32 is formed, can make to reach at least part of light in the light of inclined surface 32 and be reflected to side direction.

In this way, carrying out the light after internal reflection by exit facet 24 in the flux control member 30 recorded in patent document 1 It is not easy the surface towards flux control member 30, and is not easy to be absorbed by substrate.Therefore, with recording in patent document 1 The light emitting device of flux control member 30, can be uniformly and high compared with the light emitting device with previous flux control member 20 Effect ground irradiation light.

In addition, in recent years, as illuminating light source, the LED of chip on board (chip-on-board:COB) type is because of its peace Dressing is easy and luminous efficiency is high and used.It is known that the LED of COB type is other than light is projected in direction upwards, also to side side To projecting light more more than previous LED.

Summary of the invention

Problems to be solved by the invention

In the case where using the LED of COB type as the light-emitting component for the planar light source device recorded in patent document 1, from Make to the light that the side direction of LED is projected in large quantities from the viewpoint of the plane of incidence 22 to the incidence of the inside of flux control member, Flux control member is configured sometimes in the mode for keeping the back side of flux control member lower than the upper surface of light-emitting component.At this point, to It projects and the light of the inside of flux control member is incident in light beam control by the lower part of the plane of incidence 22 in the side direction of light-emitting component The internal communication of component processed reaches the face 34 for forming the inside of second recess portion.The light transmits simultaneously in the face 34 of the inside And it is scattered according to the surface state in face 34.Also, after the most of refraction by inclined surface 32 for the light that face 34 transmits, Xiang Guang The adjacent upper part of beam control unit is advanced (referring to Fig. 5).In this way, being used in the planar light source device that ought be recorded in patent document 1 In the case where the LED of COB type, by the scattering at the face 34 on the inside of this and the refraction at inclined surface 32, direction shines The light of the adjacent upper part of device is superfluous, so the adjacent upper part in flux control member forms the region of circular high luminance, Generate luminance nonuniformity.In addition, even if in the case where the back side of flux control member is configured to higher than the upper surface of light-emitting component, Incident light also reaches the inside to form second recess portion sometimes through refraction near the outer rim of first recess portion Face 34.

The purpose of the present invention is to provide flux control members, though the flux control member LED with COB type etc. to In the case that the light-emitting component combination use of light is projected in side direction in large quantities, it is also not easy the light for making to project from flux control member Generate luminance nonuniformity.

In addition, another object of the present invention is to provide light emitting device, planar light source devices with the flux control member And display device.

Solution to problem

Flux control member of the invention controls the light distribution of the light projected from light-emitting component, comprising: the plane of incidence is The inner surface for the recess portion that overleaf side configures in a manner of intersecting with the central axis of the flux control member makes to shine from described The light that element projects is incident；Exit facet is configured at face side in a manner of intersecting with the central axis, and makes by the plane of incidence Incident light is projected to outside；And multiple raised lines, it respectively includes the first inclined surface, the second inclined surface and is configured at described Crest line between one inclined surface and second inclined surface, and it is configured at back side, the multiple raised line is relative to the center Axis generally perpendicularly configures.

Light emitting device of the invention includes substrate；Light-emitting component, configuration is on the substrate；And configuration is in the base Flux control member of the invention on plate.

Planar light source device of the invention includes light emitting device of the invention；And light diffusion part, the light diffusion part make The light diffusion and transmission projected from the light emitting device.

Display device of the invention includes planar light source device of the invention；And display unit, the display unit are illuminated The light projected from the planar light source device.

Invention effect

Even if flux control member of the invention projects shining for light to side direction in the LED etc. with COB type in large quantities In the case that element combines, also it is not easy the light for making to project and generates luminance nonuniformity.

In addition, light emitting device of the invention, planar light source device and display device include the above-mentioned luminance nonuniformity that is not likely to produce Flux control member, so being not easy the light for making to project generates luminance nonuniformity.

Detailed description of the invention

Figure 1A~Fig. 1 C is the figure for indicating the structure of previous flux control member.

Fig. 2A and Fig. 2 B is the index path of previous flux control member.

Fig. 3 A~Fig. 3 C is the figure for indicating the structure for the flux control member recorded in patent document 1.

Fig. 4 A and Fig. 4 B are the index paths for the flux control member recorded in patent document 1.

Fig. 5 is another index path for the flux control member recorded in patent document 1.

Fig. 6 A and Fig. 6 B are the figures for indicating the structure of planar light source device of embodiment 1.

Fig. 7 A and Fig. 7 B are the sectional views for indicating the structure of planar light source device of embodiment 1.

Fig. 8 is the enlarged fragmentary cross section of the planar light source device of embodiment 1.

Fig. 9 is the perspective view of the flux control member of embodiment 1 from back side.

Figure 10 A~Figure 10 E is the figure for indicating the structure of flux control member of embodiment 1.

Figure 11 is the figure for being illustrated to simulated conditions.

Figure 12 A~Figure 12 F is the figure of the structure for three kinds of flux control members for indicating to use in simulations.

Figure 13 A~Figure 13 C is the curve graph for indicating the result of the emulation in three kinds of flux control members.

Figure 14 is the index path in the flux control member of embodiment 1.

Figure 15 A~Figure 15 C is another index path in the flux control member of embodiment 1.

Figure 16 is the index path in the flux control member of comparative example 2.

Figure 17 A~Figure 17 C is another index path in the flux control member of comparative example 2.

Figure 18 A and Figure 18 B are the bottom views of the flux control member of the variation of embodiment 1.

Figure 19 A is the enlarged fragmentary cross section of the planar light source device of embodiment 2, and Figure 19 B is for illustrating reflection suppression The figure in portion.

Specific embodiment

In the following, referring to attached drawing to the flux control member of present embodiment, light emitting device, planar light source device and display device It is illustrated.In the following description, the typical example as the planar light source device of present embodiment is filled to liquid crystal display is suitable for The planar light source device of the backlight set etc. is illustrated.

[embodiment 1]

(structure of planar light source device and light emitting device)

Fig. 6~Fig. 8 is the figure for indicating the structure of planar light source device 100 of embodiment 1.Fig. 6 A is the face of embodiment 1 The top view of light supply apparatus 100, Fig. 6 B are main views.Fig. 7 A is the sectional view of line A-A shown in Fig. 6 B, and Fig. 7 B is shown in Fig. 6 A Line B-B sectional view.Fig. 8 is the enlarged fragmentary cross section of planar light source device 100.

As shown in Fig. 6 A, Fig. 6 B, Fig. 7 A, Fig. 7 B and Fig. 8, planar light source device 100 has shell 110, multiple light emitting devices 200, light diffusing board 120.The planar light source device 100 of present embodiment can be suitable for the backlight etc. of liquid crystal display device.Separately Outside, as shown in Figure 6B, planar light source device 100 is by (using void with display units (illuminated component) 107 such as liquid crystal display panels in Fig. 6 B Line indicates) combination, additionally it is possible to it is used as display device 100 '.

Multiple light emitting devices 200 are configured to rectangular on the bottom plate 112 of shell 110, or are configured to a column.Bottom plate 112 Inner surface play as diffuse reflecting surface function.In addition, the top plate 114 in shell 110 is provided with opening portion.Light diffusing board 120 are configured in a manner of clogging the opening portion, play the function as light-emitting surface.The size of light-emitting surface for example can be set to about 400mm × about 700mm.

On first direction (X-direction shown in Fig. 7 A) in the case where configuring multiple light emitting devices 200 rectangularly Light emitting device 200 distance between centers (spacing) and the second direction orthogonal with first direction (Y-direction shown in Fig. 7 A) on The ratio of distance between centers (spacing) of light emitting device 200 be, for example, 1:4 or so.In this way, in the present embodiment, even if the The spacing of light emitting device 200 on one direction is different from the spacing of light emitting device 200 in second direction, also can equably according to Penetrate illuminated component.In this way, in the case that spacing in a first direction is different from the spacing in second direction, preferably by shining The shape for the irradiated area that device 200 irradiates is substantially elliptical.In such a situation it is preferred that elliptical long axis is along first direction The bigger direction with the spacing in second direction.Multiple light emitting devices 200 are being configured to one on the bottom plate 112 of shell 110 Column, and until arranging with multiple light emitting devices 200 end to the center of light emitting device 200 of shell 110 on orthogonal direction Distance, than distance between adjacent light emitting device 200 in the case where, preferably elliptical long axis along with multiple light emitting devices 200 Arrange orthogonal direction.

Multiple light emitting devices 200 are separately fixed at the defined position on the bottom plate 112 of shell 110.As shown in figure 8, more A light emitting device 200 is respectively provided with substrate 210, light-emitting component 220, flux control member 300.

Substrate 210 is the component for the plate being supported to light-emitting component 220 and flux control member 300.Substrate 210 with Mode on bottom plate 112 with defined interval configures.

Light-emitting component 220 is the light source of planar light source device 100, and configuration is over the substrate 210.Light-emitting component 220 is e.g. white The light emitting diodes such as color light emitting diode (LED).In the present embodiment, go out from the viewpoint that installation is easy and luminous efficiency is high The LED that hair, preferably light-emitting component 220 are chip on board (COB) type.

The LED of known COB type projects more light to side direction than previous LED.The light-emitting components such as the LED of COB type 220 project a large amount of light to side direction, so needing to make the light projected to the side surface direction of light-emitting component 220 more to light Beam control unit 300 is incident.Thus it is preferred to which light-emitting component 220 is with its upper surface to be located at than under aftermentioned first recess portion 310 The mode of end (opening edge) more above vertical direction configures.

Flux control member 300 is lens, is fixed on substrate 210.Flux control member 300 is to from light-emitting component 220 The light distribution of the light of injection is controlled, by the direction of travel of the light to the face Directional Extension of substrate 210.Flux control member 300 In such a way that central shaft CA is overlapped with the optical axis OA of light-emitting component 220, it is configured on light-emitting component 220 (referring to Fig. 8).This Outside, " the central axis CA of flux control member 300 " refers to the straight line of the rotation center by flux control member 300.In addition, this The flux control member 300 of embodiment is due to being rotational symmetry (Double Symmetry), so the central axis of flux control member 300 CA is overlapped with the midpoint of the flux control member 300 on first direction, and in the flux control member 300 in second direction Point is overlapped.In addition, " the optical axis OA of light-emitting component " refers to the light for coming the center of three-dimensional outgoing beam of self-emission device 220 Line.

Flux control member 300 can be formed by being integrally formed.For the material of flux control member 300, as long as It is the material that the light of desired wavelength can be made to pass through.For example, the material of flux control member 300 is polymethyl Translucent resins or the glass such as sour methyl esters (PMMA), polycarbonate (PC), epoxy resin (EP), silicone resin.Present embodiment Planar light source device 100 is characterized mainly in that in the structure of flux control member 300.Therefore, in addition to flux control member 300 It is described in detail.

Light diffusing board 120 is the component with the plate of light diffusivity, makes the outgoing light diffusion for carrying out selfluminous device 200 Make its transmission simultaneously.Light diffusing board 120 on multiple light emitting devices 200 across air layer and substantially in parallel with substrate 210 Configuration.In general, light diffusing board 120 is the size almost the same with the illuminated component such as liquid crystal display panel.For example, light diffusing board 120 By polymethyl methacrylate (PMMA), polycarbonate (PC), polystyrene (PS), styrene methyl methacrylate combined polymerization The translucent resins such as resin (MS) are formed.In order to assign light diffusivity, it is formed on the surface of light diffusing board 120 subtle recessed It is convex, or the light diffusions such as bead is dispersed in the inside of light diffusing board 120.

In planar light source device 100 of the invention, the light projected from each light-emitting component 220 is extended by flux control member 300 It is irradiated with the wide scope to light diffusing board 120.The light projected from each flux control member 300 is further by light diffusing board 120 diffusions.As a result, planar light source device 100 of the invention can illuminated component (such as liquid crystal display panel) to planar it is uniform Ground is irradiated.

(structure of flux control member)

Fig. 9 and Figure 10 A~Figure 10 E is the figure for indicating the structure of flux control member 300 of embodiment 1.Fig. 9 is from back The perspective view of surface side (210 side of substrate) observation flux control member 300.Figure 10 A is the top view of flux control member 300, figure 10B is bottom view, and Figure 10 C is main view, and Figure 10 D is left view, and Figure 10 E is the sectional view of line A-A shown in Figure 10 A.

As shown in Fig. 9 and Figure 10 A~Figure 10 E, flux control member 300 has the plane of incidence 310, exit facet 320 and multiple Raised line 330.In addition, flux control member 300 also can have it is convex for becoming easy the installation of flux control member 300 Edge.Also, flux control member 300 also can have foot section, which forms for making to release from light-emitting component 220 Heat to the gap of outside diffusion, and for flux control member 300 to be positioned and fixed over the substrate 210.Institute in figure The foot section shown is formed from the back side 305 with column protrusion, and is being located at 307 remote position of recess portion away from the plane of incidence 310 Concave curved surface is formed on columnar side, to penetrate with extending via the anaclasis for reaching concave curved surface in flux control member 300 Out.

The plane of incidence 310 is the center that back side is configured in a manner of intersecting by the central axis CA with flux control member 300 The inner surface of the recess portion 307 in portion.Recess portion 307 is with the optical axis OA (the central axis CA of flux control member 300) with light-emitting component 220 The mode of intersection configures.The plane of incidence 310 controls the traveling of the light to from the most light in the light that light-emitting component 220 projects Direction, and it is made to be incident to the inside of flux control member 300.The section vertical with central axis CA of the plane of incidence 310 both may be used To be ellipse, it is also possible to circle.In the present embodiment, the section vertical with central axis CA of the plane of incidence 310 is oval Shape.In addition, the plane of incidence 310 is in the section comprising central axis CA, by further away from central axis CA closer to the back side 305 in a manner of shape At.The plane of incidence 310 is the rotational symmetry (Double Symmetry) using central axis CA as rotary shaft.In addition, in the following description, it will " section vertical with central axis CA " is referred to as " horizontal profile ".

The back side 305 is the back side positioned at flux control member 300 and from the opening edge of recess portion 307 to radially extending Plane.

Exit facet 320 is in such a way that the face side (120 side of light diffusing board) from flange part to flux control member 300 is outstanding Configuration.Exit facet 320 projects it to outside the light being incident in flux control member 300. Exit facet 320 is configured in a manner of intersecting with central axis CA.In the case where the horizontal profile of the plane of incidence 310 is ellipse, out The horizontal profile for penetrating face 320 is ellipse or circle.In addition, the horizontal profile in the plane of incidence 310 is outgoing in circular situation The horizontal profile in face 320 is ellipse.That is, at least one in the horizontal profile of the plane of incidence 310 and the horizontal profile of exit facet 320 Person is ellipse.In the present embodiment, the horizontal profile of the horizontal profile of the plane of incidence 310 and exit facet 320 is all ellipse. In addition, in the present embodiment, elliptical long axis in the horizontal profile of the plane of incidence 310 and in the horizontal profile of the plane of incidence 310 Elliptical short axle it is parallel.

Exit facet 320 includes the first exit facet 320a of the prescribed limit being located at centered on central axis CA；Go out first Penetrate the second exit facet 320b being continuously formed around the 320a of face；And connect the second exit facet 320b with flange part Three exit facet 320c (0C referring to Fig.1).In the present embodiment, the first exit facet 320a is the curved surface for being convex to back side.But In the case where the horizontal profile of exit facet 320 is ellipse, in the section along short axle, the first exit facet 320a is also different It surely must be the curved surface for being convex to back side.It is adjusted according to the arrangement (spacing) of the light emitting device 200 on the direction along short axle It is convex to the degree of back side.Second exit facet 320b be it is around the first exit facet 320a, be convex to face side it is smooth Curved surface.The shape of second exit facet 320b is elliptical cricoid convex form.Third exit facet 320c is to be located at the second outgoing Curved surface around the 320b of face.As illustrated in figure 10 c, in the section comprising central axis CA, the section of third exit facet 320c was both It can be linearly, be also possible to curve-like.

Multiple raised lines 330 are configured at the back side of flux control member 300.Raised line 330 makes to carry out inside by exit facet 320 Light reflection after reflection.Each raised line 330 has the first inclined surface 331, the second inclined surface 332 and is configured at the first inclined surface 331 and the second crest line 333 between inclined surface 332.The example of the section shape vertical with the crest line 333 of raised line 330 includes: three Angular shape implements the triangle after R chamfering, semicircle to top, presss from both sides between the first inclined surface 331 and the second inclination 332 The platform shape of other faces etc..In the present embodiment, the section shape vertical with the crest line 333 of raised line 330 is triangle. That is, in the present embodiment, the first inclined surface 331 is connect with the second inclined surface 332 by crest line 333.In addition, each raised line 330 with The mode substantially vertical with central axis CA configures.Here, " substantially vertical with central axis CA " refers in cuing open comprising central axis CA In face, the extended line angulation of central axis CA and crest line 333 is in the range of 88 °~92 °.Each raised line 330 is played as complete Function as reflecting prism.

As described above, the horizontal profile of the plane of incidence 310 is ellipse.At least part of multiple raised lines 330 is in the ellipse Short-axis direction on along short-axis direction configure in the outside of recess portion 307.Here, the concept of " along short-axis direction " not only includes The crest line 333 of raised line 330 situation parallel with short axle further includes the extended line of the extended line and the crest line 333 of raised line 330 of short axle The case where angulation is in the range of 0 °~5 °.In the present embodiment, multiple raised lines 330 are in flux control member 300 Back side outer edge, be configured to centered on central axis CA radial.That is, in the present embodiment, to surround recess portion 307 Mode be configured with the back side 305, and in a manner of surrounding the back side 305 be configured with multiple raised lines 330.Here, " multiple raised lines 330 It is configured to centered on central axis CA radial " refer to and matches respectively in such a way that the extended line of crest line 333 intersects with central axis CA It is equipped with multiple raised lines 330.

In addition, at least part of multiple raised lines 330 exists in the case where the horizontal profile of exit facet 320 is ellipse It is configured along long axis direction in the outside of recess portion 307 on the elliptical long axis direction.Here, the concept of " along long axis direction " is not Only include the case where that the crest line 333 of raised line 330 is parallel with long axis, further includes the extended line of long axis and the crest line 333 of raised line 330 The case where extended line angulation is in the range of 0 °~5 °.In the present embodiment, multiple raised lines 330 are in Beam Control portion The outer edge of the back side of part 300 is configured to radial centered on central axis CA.That is, being configured in a manner of surrounding recess portion 307 There is the back side 305, and is configured with multiple raised lines 330 in a manner of surrounding the back side 305.

(emulation of the light distribution characteristic of flux control member)

The light distribution characteristic of flux control member 300 of the invention is emulated.Figure 11 is for illustrating simulated conditions Figure.

As shown in figure 11, it is assumed that project light from origin O with angle (θ, φ).Angle, θ is angle of the light relative to z-axis Degree.In addition, angle φ is angle of the light relative to the x-axis in the first quartile of x/y plane.Assuming that shining with light-emitting component The mode that face is overlapped with x/y plane is configured with light-emitting component.Assuming that configure flux control member to, on x/y plane, center Axis CA is overlapped with z-axis, and the elliptical short axle of the horizontal profile of exit facet is parallel with x-axis, the ellipse of the horizontal profile of exit facet Long axis it is parallel with y-axis.In addition, it is assumed that configuring flux control member to, the lower end of the plane of incidence is located at away from x/y plane 0.03mm Position.The maximum outside diameter of the exit facet of flux control member is 21.0mm, and the maximum outside diameter of the plane of incidence is 4.5mm, maximum high Degree is that (height at the back side away from flux control member) is 6.35mm.30mm is left in addition, will be located at from x/y plane to z-axis direction Position the face (x ' y ' face) parallel with x/y plane, it is assumed that be plane of illumination.

In simulations, investigated make under angle φ (φ=45 °) angle, θ (θ=20 °, 30 °, 40 °, 45 °, 50 °, 60 °, 70 °, 80 °) in the case where variation, is projected from optical element, is incident by the plane of incidence and the light after internal reflection is carried out by exit facet Which position of plane of illumination reached.

Figure 12 A~Figure 12 F is the figure for indicating the structure of three kinds of flux control members used in emulation.Figure 12 A, figure 12C and Figure 12 E is the bottom view of flux control member respectively, and Figure 12 B, Figure 12 D and Figure 12 F are the section comprising central axis respectively Figure.

Flux control member shown in Figure 12 A and Figure 12 B is the flux control member 300 of present embodiment.Figure 12 C and figure Flux control member shown in 12D is that overleaf side is formed with endless groove 308A, comparative example 1 in a manner of surrounding recess portion 307A Flux control member 300A.Flux control member shown in Figure 12 E and Figure 12 F be overleaf side to surround the side of recess portion 307B Formula be formed with endless groove 308B and the face in the outside of endless groove 308B with it is radial be formed with it is raised line 330B, comparative example 2 Flux control member 300B.

Figure 13 A~Figure 13 C is the curve graph for indicating the result of emulation.These curves illustrate plane of illumination (shown in Figure 11 X ' y ' plane) in each light (φ=45 ° be constant, θ=20 °, 30 °, 40 °, 45 °, 50 °, 60 °, 70 °, 80 °) arrival Position.Figure 13 A is the result of the emulation of the flux control member 300 of present embodiment.Figure 13 B is the Beam Control of comparative example 1 The result of the emulation of component 300A.Figure 13 C is the result of the emulation of the flux control member 300B of comparative example 2.Figure 13 A~figure The horizontal axis of 13C indicates distance (mm) of the slave central axis CA in plane of illumination (face x ' y ') to X-direction.The longitudinal axis indicates plane of illumination The distance (mm) of slave central axis CA in (face x ' y ') to Y-direction.In addition, φ=45 ° of comparative example 2, θ=30 ° light by In marching to place more farther than set plane of illumination, so being not shown in Figure 13 C.

As shown in Figure 13 A~Figure 13 C, the flux control member 300 of present embodiment and the flux control member of comparative example 1 300A is compared with the flux control member 300B of comparative example 2, is projected and is carried out by exit facet 320 internal anti-from light-emitting component 220 Light after penetrating is not easy optically focused.This may be considered due to especially from light-emitting component 220 with the injection of larger shooting angle and by going out Penetrate face 320 carry out internal reflection after light, raised line 330 is incident to biggish angle relative to raised line 330, by raised line 330 into One step carries out internal reflection.Then, to maintain the state of biggish angle to the outer of flux control member 300 relative to optical axis OA Project (referring to Fig.1 4) in portion.

Then, to the optical path of the flux control member 300B of the flux control member of present embodiment 300 and comparative example 2 An example is illustrated.Figure 14 and Figure 15 shows an example of the optical path in the flux control member 300 of present embodiment, Figure 16 and figure 17 show an example of the optical path in the flux control member 300B of comparative example 2.Figure 14 shows θ=70 ° in above-mentioned Figure 11, φ The optical path of=90 ° of light.That is, Figure 14 is the light that the elliptical long axis direction into the horizontal profile of exit facet 320 projects In index path.In addition, Figure 15 shows the optical path of the light of θ=44.74 ° in above-mentioned Figure 11, φ=50.56 °.Another party Face, Figure 16 show the optical path of the light of θ=70 °, φ=90 °.That is, Figure 16 is the ellipse into the horizontal profile of exit facet 320 Long axis direction project light index path.Figure 17 shows the light of θ=44.74 ° in above-mentioned Figure 11, φ=50.56 ° Optical path.In addition, section is omitted in order to indicate optical path in Figure 14, Figure 15 A, Figure 15 B, Figure 16, Figure 17 A and Figure 17 B Line.

As shown in figure 14, in the flux control member of present embodiment 300, from light-emitting component 220 to Beam Control portion The light of a part in light that the long axis direction of part 300 projects carries out interior by 310 incidence of the plane of incidence and by exit facet 320 Portion's reflection.Internal reflection is carried out by raised line 330 again by the light that exit facet 320 carries out after internal reflection.It is carried out by raised line 330 After light after internal reflection carries out internal reflection by exit facet 320, projected from the back side of flux control member 300.From light The light that the back side of beam control unit 300 projects is again incident on the inside of flux control member 300, and court from raised line 300 It is projected with from the direction for the contrary side that light-emitting component 220 projects.

In addition, as shown in Figure 15 A~Figure 15 C, from the light of a part in the light that light-emitting component 220 projects by incidence Face 310 is incident, and carries out internal reflection in the place a of exit facet 320.Existed by the light that exit facet 320 carries out after internal reflection The place b of raised line further changes direction of travel and carries out internal reflection.By raised line the place b carry out internal reflection after light from It is projected to the side of flux control member 300 in the place c of exit facet 320.

As shown in figure 16, in the flux control member 300B of comparative example 2, from the light that light-emitting component 220 projects The light of a part is incident by plane of incidence 310B, and carries out internal reflection by exit facet 320B.It is carried out by exit facet 320B internal Light after reflection carries out internal reflection by raised line 330B again.Light after internal reflection is carried out by exit facet by raised line 330B After 320B carries out internal reflection, projected from the back side of flux control member 300B.From the back side of flux control member 300B The light of injection is again incident on the inside of flux control member 300B from raised line 330B, and from exit facet 320B to Beam Control It projects the surface of component 300B.

In addition, as shown in Figure 17 A~Figure 17 C, from the light of a part in the light that light-emitting component 220 projects by incidence Face 310B is incident, and carries out internal reflection in the place a of exit facet 320B.Light after internal reflection is carried out by exit facet 320B It is projected from the place b of the raised line 330B of endless groove to the external of flux control member 300B.From the back of flux control member 300B The light that surface side is projected is again incident on the inside of flux control member 300B from endless groove, and from the place c of exit facet 320B It is projected to the surface portion of flux control member 300B.

(effect)

As described above, the raised line 330 of flux control member 300 is in the planar light source device 100 of present embodiment Extend in mandrel CA generally perpendicular direction.As a result, from light-emitting component 220 with biggish angle injection and by exit facet 320 into The light of a part in light after row internal reflection, to maintain the state of biggish shooting angle to project from exit facet 320, therefore It is not likely to produce luminance nonuniformity.

[variation]

Then, 8 pairs of modified embodiment of the present embodiment are illustrated referring to Fig.1.In the planar light source device of variation, only light The structure of beam control unit 400 and flux control member 500 is different from planar light source device 100.Therefore, in the present embodiment, Mainly flux control member 400 and flux control member 500 are illustrated.In addition, for identical with planar light source device 100 Structure is marked with identical appended drawing reference and the description thereof will be omitted.

Figure 18 A and Figure 18 B are the flux control member 400 and flux control member 500 of the planar light source device of variation Bottom view.Figure 18 A is the bottom view of the flux control member 400 of variation, and Figure 18 B is the flux control member of another variation 500 bottom view.

As shown in Figure 18 A, the flux control member 400 of variation similarly, the ellipse in the horizontal profile of the plane of incidence 310 Long axis it is parallel with the elliptical short axle in the horizontal profile of exit facet 320.Multiple raised lines 430 are cutd open in the level of the plane of incidence 310 It is configured along short-axis direction in the outside of recess portion 307 on elliptical short-axis direction in face.Alternatively, it is also possible to say, multiple raised lines It is configured along long axis direction in the outside of recess portion 307 on the 430 elliptical long axis direction in the horizontal profile of exit facet 320. More specifically, all raised lines 330 are cutd open with the level with elliptical short axle and exit facet 320 in the horizontal profile of the plane of incidence 310 The parallel mode of elliptical long axis in face configures.In addition, multiple raised lines 430 are only formed in the back side of flux control member 400 The outer edge of side, the elliptical short-axis direction (exit facet that is located at relative to the plane of incidence 310 in the horizontal profile of the plane of incidence 310 Elliptical long axis direction in 320 horizontal profile) region.

In addition, as shown in figure 18b, the flux control member 500 of another variation similarly, cut open by the level of the plane of incidence 310 Elliptical long axis in face is parallel with the elliptical short axle in the horizontal profile of the plane of incidence 310.Multiple raised lines 530 are in the plane of incidence Along short-axis direction and long axis direction configuration in recess portion on elliptical short-axis direction and long axis direction in 310 horizontal profile 307 outside.Alternatively, it is also possible to say, elliptical short-axis direction of multiple raised lines 530 in the horizontal profile of exit facet 320 and Along long axis direction and long axis direction configuration in the outside of recess portion 307 on long axis direction.More specifically, all raised lines 530 with Elliptical short axle in the horizontal profile of the plane of incidence 310 side parallel with the elliptical long axis in the horizontal profile of exit facet 320 Formula configuration, and with the ellipse in the horizontal profile of elliptical long axis and exit facet 320 in the horizontal profile of the plane of incidence 310 The parallel mode of short axle configure.In addition, multiple raised lines 530 are only formed in, the outer edge of the back side of flux control member 500 , relative to the plane of incidence 310 and be located at the plane of incidence 310 horizontal profile in the elliptical short-axis direction (level of exit facet 320 Elliptical long axis direction in section) region and the elliptical long axis direction in the horizontal profile of the plane of incidence 310 The region of (the elliptical short-axis direction in the horizontal profile of exit facet 320).

[embodiment 2]