CN207349871U

CN207349871U - Flux control member, light-emitting device, planar light source device and display device

Info

Publication number: CN207349871U
Application number: CN201621346407.0U
Authority: CN
Inventors: 平加健介
Original assignee: Enplas Corp
Current assignee: Enplas Corp
Priority date: 2016-08-30
Filing date: 2016-12-09
Publication date: 2018-05-11
Anticipated expiration: 2026-12-09
Also published as: CN107781721B; CN107781721A; JP2018036407A

Abstract

It the utility model is related to flux control member, light-emitting device, planar light source device and display device.The light distribution for the light that the flux control member control of the utility model is projected from light-emitting component, including：The plane of incidence, its be in a manner of the central shaft with flux control member intersects overleaf side formed recess inner surface；And exit facet, it is configured at the opposite side of the plane of incidence.Exit facet includes：First exit facet, it is configured in a manner of intersecting with central shaft and surface side of supporting or opposing is convex；And second exit facet, it is configured and convex to face side in a manner of surrounding the first exit facet.Light-emitting component is being arranged as opposed in a manner of being located at by its centre of luminescence on central shaft with recess and in a manner of with orthogonality of center shaft in the case of the top of exit facet configuration plane of illumination, the second maximum calculated using regulation formula is more than the first maximum calculated using regulation formula.

Description

Flux control member, light-emitting device, planar light source device and display device

Technical field

It the utility model is related to the flux control member of the light distribution for the light that control is projected from light-emitting component, there is the light beam control Light-emitting device, planar light source device and the display device of component processed.

Background technology

In recent years, from the viewpoint of energy saving or miniaturization, light emitting diode (hereinafter referred to as " LED ") conduct is used Illuminating light source.Also, it is used and is combined with flux control members of the LED with controlling the light distribution from the LED light projected Light-emitting device replaces fluorescent lamp or halogen lamp etc..In addition, in the transmission image display device of liquid crystal display device etc., The planar light source device of the full run-down type of the light-emitting device using latticed is equipped with as backlight (for example, referring to patent document 1)。

Figure 1A~Fig. 1 C are the figures for the structure for representing the planar light source device 10 described in patent document 1.Figure 1A is area source The schematical top view of device 10, Figure 1B are the top views of the light-emitting device 30 in planar light source device 10, and Fig. 1 C are Figure 1B institutes The profile of the line A-A shown.Represent to the dotted line of Figure 1A the range of exposures of light projected from light-emitting device 30.

As shown in Figure 1A~Fig. 1 C, the planar light source device 10 described in patent document 1 includes tellite 20 and square Shape configures multiple light-emitting devices 30 on tellite 20 latticedly.Multiple light-emitting devices 30 are respectively comprising the member that shines Part 35 and the light guide member (flux control member) 40 configured in a manner of being covered on light-emitting component 35.

Light guide member 40 includes approximately hemispheric lens section 41 and the flange part configured in a manner of surrounding lens section 41 42.In addition, lens section 41 includes being configured at the inner surface i.e. plane of incidence 44 of the recess 43 of rear side and is configured at going out for face side Penetrate face 45.Exit facet 45 includes two planes 46 being parallel to each other with central shaft CA and is configured between two planes 46 and upwards Convex curved surface 47.For guide-lighting in the planar light source device 10 described in patent document 1, the light projected from light-emitting component 35 The control of component 40 is the short direction (short side direction of rectangular mesh with the interval of multiple light-emitting devices 30；Y-direction) compare, more Direction (the long side direction of rectangular mesh long to the interval of multiple light-emitting devices 30；X directions) diffusion.Therefore, for patent text The planar light source device described in 1 is offered, also can be equal in the case that multiple light-emitting devices 30 are configured as rectangle net trellis Plane of illumination is irradiated evenly.

Prior art literature

1 International Publication No. of patent document 2009-157166

Utility model content

Utility model will solve the problems, such as

But in the planar light source device 10 described in patent document 1, the light projected from plane 46 is controlled as optically focused. On the other hand, the light projected from curved surface 47 is controlled as spreading.Thus, projected from the light of the injection of plane 46 and from curved surface 47 Light easily intersects in the light path for reaching plane of illumination.Therefore, bright portion is generated on plane of illumination sometimes.

Here, the purpose of this utility model is that, there is provided one kind is configured as latticed situation even in light-emitting device Under, it can also suppress the flux control member of the generation in bright portion on plane of illumination.In addition, the another object of the utility model exists In, there is provided there is light-emitting device, planar light source device and the display device of the flux control member.

Solution to problem

To achieve these goals, the light that the flux control member control of the utility model is projected from light-emitting component is matched somebody with somebody Light, including：The plane of incidence, it is the recess that overleaf side is formed in a manner of the central shaft with the flux control member intersects Inner surface；And exit facet, it is configured at the opposite side of the plane of incidence, and the exit facet includes：First exit facet, its with The mode that the central shaft intersects configures and surface side of supporting or opposing is convex；And second exit facet, it is to surround first outgoing The mode in face configures and convex to face side, in a manner of being located at by its centre of luminescence on the central shaft with the recess phase The light-emitting component is configured over the ground and configures plane of illumination in the top of the exit facet in a manner of with the orthogonality of center shaft In the case of, the second maximum obtained by following " computational methods of the second maximum " is more than by following " first The first maximum that the computational methods of maximum " are obtained,

The computational methods of first maximum include the following steps：

(1) the first polynomial approximation function of the relation for representing light emitting angle θ 1A and injection angle θ 3A, the hair are obtained Angular θ 1A are the first of the nearest point of central shaft described in the outer rim middle-range comprising the central shaft and the exit facet In section, direct of travel phase of any light between the centre of luminescence and the plane of incidence that is projected from the centre of luminescence For the angle of the central shaft, the injection angle θ 3A are any light in the exit facet and the plane of illumination Between direct of travel relative to the central shaft angle,

(2) the first curve corresponding with the first differential of the first polynomial approximation function is obtained,

(3) it is maximum using the maximum in first curve as first in the case where light emitting angle θ 1A are more than 40 ° Value；

The computational methods of second maximum include the following steps：

(1) the second polynomial approximation function of the relation for representing light emitting angle θ 1B and injection angle θ 3B, the hair are obtained Angular θ 1B are the second of the farthest point of central shaft described in the outer rim middle-range comprising the central shaft and the exit facet In section, direct of travel phase of any light between the centre of luminescence and the plane of incidence that is projected from the centre of luminescence For the angle of the central shaft, the injection angle θ 3B are any light in the exit facet and the plane of illumination Between direct of travel relative to the central shaft angle,

(2) the second curve corresponding with the first differential of the second polynomial approximation function is calculated,

(3) it is maximum using the maximum in second curve as second in the case where light emitting angle θ 1B are more than 40 ° Value.

To achieve these goals, the light-emitting device of the utility model includes, light-emitting component；And above-mentioned Beam Control portion Part.

To achieve these goals, the planar light source device of the utility model includes, the light-emitting device of multiple the utility model, It is configured in a manner of the centre of luminescence of the light-emitting component is rectangle net trellis；And light diffusing board, it makes from more The light diffusion and transmission of a light-emitting device, the planar light source device meet following formula (1),

D1 ＜ P ＜ D2 formulas (1)

In above-mentioned formula (1), D1 is the half of the long edge lengths of the unit grids of the rectangular mesh, and D2 is the square The half of the catercorner length of the unit grids of shape grid, P are with the light emitting angle θ 1B corresponding with second maximum Intersection point of the light projected from the centre of luminescence of the light-emitting component on the light diffusing board and the central shaft away from From.

To achieve these goals, the light that the flux control member control of the utility model is projected from light-emitting component is matched somebody with somebody Light, including：The plane of incidence, it is the recess that overleaf side is formed in a manner of the central shaft with the flux control member intersects Inner surface；And exit facet, it is configured at the opposite side of the plane of incidence, and the exit facet includes：First exit facet, its with The mode that the central shaft intersects configures and surface side of supporting or opposing is convex；And second exit facet, it is to surround first outgoing The mode in face configures and convex to face side, in a manner of being located at by its centre of luminescence on the central shaft with the recess phase The light-emitting component is configured over the ground and configures plane of illumination in the top of the exit facet in a manner of with the orthogonality of center shaft In the case of, meet following formula (2),

In above-mentioned formula (2), D1 is that first obtained by following formula (3) reaches distance, which is to wrap In first section of the nearest point of central shaft described in the outer rim middle-range containing the central shaft and the exit facet, with the first hair Point of arrival distance away from the central shaft of the first light that angular is projected from the centre of luminescence on the plane of illumination, D2 is that second obtained by following formula (4) reaches distance, which is comprising the central shaft and described In second section of the farthest point of central shaft described in the outer rim middle-range of exit facet, penetrated with the second light emitting angle from the centre of luminescence Point of arrival distance away from the central shaft of the second light gone out on the plane of illumination, first light emitting angle is under State " computational methods of the first light emitting angle " to obtain, second light emitting angle passes through following " calculating sides of the second light emitting angle Method " is obtained,

D1=h1atan θ 1a+h2atan θ 2a+h3atan θ 3a formulas (3)

In above-mentioned formula (3), h1a be in first section, the centre of luminescence and first light it is described enter Distance between the incidence point on face i.e. the first incoming position, on the direction along the central shaft is penetrated, h2a is described In one section, first incoming position and i.e. the first Exit positions of eye point of first light on the exit facet it Between, distance on the direction along the central shaft, h3a is first Exit positions and institute in first section State it is between the i.e. first illuminated position of the point of arrival of first light on the plane of illumination, in the direction along the central shaft On distance, θ 1a are the rows of first light between the centre of luminescence and the plane of incidence in first section Angle into direction relative to the central shaft, i.e., described first light emitting angle, θ 2a be in first section, it is described enter It is in institute that the direct of travel of first light between face and the exit facet, which is penetrated, relative to the angle of the central shaft, θ 3a State in the first section, the direct of travel of first light between the exit facet and the plane of illumination is relative in described The angle of mandrel,

D2=h1btan θ 1b+h2btan θ 2b+h3btan θ 3b formulas (4)

In above-mentioned formula (4), h1b be in second section, the centre of luminescence and second light it is described enter Distance between the incidence point on face i.e. the second incoming position, on the direction along the central shaft is penetrated, h2b is described In two sections, second incoming position and i.e. the second Exit positions of eye point of second light on the exit facet it Between, distance on the direction along the central shaft, h3b is second Exit positions and institute in second section State it is between the i.e. second illuminated position of the point of arrival of second light on the plane of illumination, in the direction along the central shaft On distance, θ 1b are the rows of second light between the centre of luminescence and the plane of incidence in second section Angle into direction relative to the central shaft, i.e., described second light emitting angle, θ 2b be in second section, it is described enter It is in institute that the direct of travel of second light between face and the exit facet, which is penetrated, relative to the angle of the central shaft, θ 3b State in the second section, the direct of travel of second light between the exit facet and the plane of illumination is relative in described The angle of mandrel,

The computational methods of first light emitting angle include the following steps：

(1) the first polynomial approximation function of the relation for representing light emitting angle θ 1A and injection angle θ 3A, the hair are obtained Angular θ 1A be in first section from the centre of luminescence project any light the centre of luminescence with it is described enter Angle of the direct of travel between face relative to the central shaft is penetrated, the injection angle θ 3A are any light described Direct of travel between exit facet and the plane of illumination relative to the central shaft angle,

(3) obtain first slope of a curve and be changed into the oblique of positive 1 or more than 2 bottom point and first curve from negative Rate changes from positive to 1 or more than 2 negative vertex,

(4) to each described 1 or more than 2 bottom point, a vertex is determined from described 1 or more than 2 vertex respectively, should The light emitting angle θ 1A on vertex are more than the light emitting angle θ 1A of the bottom point and closest to the light emitting angle θ 1A of the bottom point,

(5) differential of the injection angle θ 3A between the corresponding vertex is determined from described 1 or more than 2 bottom point It is worth the maximum bottom point of the difference of Δ θ 3A, using the light emitting angle θ 1A of definite bottom point as the first light emitting angle θ 1a；

The computational methods of second light emitting angle include the following steps：

(1) the second polynomial approximation function of the relation for representing light emitting angle θ 1B and injection angle θ 3B, the hair are obtained Angular θ 1B be in second section from the centre of luminescence project any light the centre of luminescence with it is described enter Angle of the direct of travel between face relative to the central shaft is penetrated, the injection angle θ 3B are any light described Direct of travel between exit facet and the plane of illumination relative to the central shaft angle,

(2) the second curve corresponding with the first differential of the second polynomial approximation function is obtained,

(3) obtain second slope of a curve and be changed into the oblique of positive 1 or more than 2 bottom point and second curve from negative Rate changes from positive to 1 or more than 2 negative vertex,

(4) to each described 1 or more than 2 bottom point, a vertex is determined from described 1 or more than 2 vertex respectively, should The light emitting angle θ 1B on vertex are more than the light emitting angle θ 1B of the bottom point and closest to the light emitting angle θ 1B of the bottom point,

(5) differential of the injection angle θ 3B between the corresponding vertex is determined from described 1 or more than 2 bottom point It is worth the maximum bottom point of the difference of Δ θ 3B, using the light emitting angle θ 1B of definite bottom point as the first light emitting angle θ 1b.

To achieve these goals, the light that the flux control member control of the utility model is projected from light-emitting component is matched somebody with somebody Light, including：The plane of incidence, it is the recess that overleaf side is formed in a manner of the central shaft with the flux control member intersects Inner surface；And exit facet, it is configured at the opposite side of the plane of incidence, and the exit facet includes：First exit facet, its with The mode that the central shaft intersects configures and surface side of supporting or opposing is convex；And second exit facet, it is to surround first outgoing The mode in face configures and convex to face side, and second exit facet is in the section comprising the central shaft in away from described The farthest position of mandrel has extension, and the plan view shape of the flux control member is through the generally square of R chamferings.

In one embodiment, the plane of incidence is circularly symmetric on the central shaft, and the exit facet is in described Mandrel is in four sub-symmetries.

In one embodiment, in the first section and the second section, first exit facet has identical curvature, institute Stating the second exit facet has different curvature, and first section is the outer rim comprising the central shaft and the exit facet The section of the nearest point of central shaft described in middle-range, second section are outer comprising the central shaft and the exit facet The section of the farthest point of central shaft described in edge middle-range.

In addition, to achieve these goals, the planar light source device of the utility model includes, the luminous dress of the utility model Put；And make the light diffusion from the light-emitting device and the light diffusing board transmitted.

To achieve these goals, the display device of the utility model includes, the planar light source device of the utility model；And Illuminated portion's material of the illuminated light projected from the planar light source device.

The utility model effect

Even if the flux control member of the utility model is configured as latticed, it can also suppress the bright portion on plane of illumination Generation.Further, since the light-emitting device of the utility model, planar light source device and display device, which have, suppresses plane of illumination On bright portion generation flux control member, so being difficult to generate bright portion on plane of illumination.

Brief description of the drawings

Figure 1A~Fig. 1 C are the figures for the structure for representing the planar light source device described in patent document 1.

Fig. 2A, Fig. 2 B are the figures of the structure of the planar light source device for the embodiment for representing the utility model.

Fig. 3 A, Fig. 3 B are the profiles of the planar light source device of an embodiment of the utility model.

Fig. 4 is the enlarged fragmentary cross section of the planar light source device of an embodiment of the utility model.

Fig. 5 A~Fig. 5 C are the figures of the structure of the flux control member for the embodiment for representing the utility model.

Fig. 6 A, Fig. 6 B are the index paths in light-emitting device.

Fig. 7 is the figure for illustrating light emitting angle and injection angle.

Fig. 8 A, Fig. 8 B are the curve maps for illustrating the computational methods of the first maximum.

Fig. 9 A, Fig. 9 B are the curve maps for illustrating the computational methods of the second maximum.

Figure 10 is the figure for formula (1).

Figure 11 A, Figure 11 B are the figures for illustrating easing portion.

Figure 12 A~Figure 12 C are the figures for illustrating foot.

Figure 13 A, Figure 13 B are the figures for formula (2)~formula (4).

Figure 14 A, Figure 14 B are the curve maps for illustrating the computational methods of the first light emitting angle.

Figure 15 A, Figure 15 B are the curve maps for illustrating the computational methods of the second light emitting angle.

Figure 16 is the curve map for the measurement result for representing the brightness in planar light source device.

Figure 17 A, Figure 17 B are the figures for the analog result for representing the brightness in planar light source device.

Description of reference numerals

10 planar light source devices

20 tellites

30 light-emitting devices

35 light-emitting components

40 light guide members

41 lens sections

42 flange parts

43 recesses

44 planes of incidence

45 exit facets

46 planes

47 curved surfaces

100 planar light source devices

100 ' display devices

107 plane of illuminations

110 housings

112 bottom plates

114 top plates

120 light diffusing boards

200 light-emitting devices

210 substrates

220 light-emitting components

300 flux control members

305 back sides

310 recesses

320 planes of incidence

330 exit facets

The first exit facets of 330a

The second exit facets of 330b

330c extensions

411A, 411B easing portion

421A, 421B, 421C foot

The central shaft of CA flux control members

The optical axis of OA light-emitting components

Embodiment

Hereinafter, the flux control member of the utility model, light-emitting device, planar light source device and display are filled referring to the drawings Put and be described in detail.In the following description, as the utility model planar light source device typical example, to suitable for liquid crystal The backlight of showing device etc., light-emitting device is configured to latticed planar light source device and illustrates.

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

Fig. 2A~Fig. 4 is the figure of the structure of the planar light source device 100 for the embodiment for representing the utility model.Fig. 2A is The top view of the planar light source device 100 of one embodiment of the utility model, Fig. 2 B are front views.Fig. 3 A are along shown in Fig. 2 B Line A-A profile, Fig. 3 B are the profiles along the line B-B shown in Fig. 2A.Fig. 4 is the partial enlargement of planar light source device 100 Profile.

As shown in Fig. 2A, Fig. 2 B, Fig. 3 A, Fig. 3 B and Fig. 4, planar light source device 100 includes housing 110, multiple luminous dresses Put 200 and light diffusing board (plane of illumination) 120.The planar light source device 100 of the utility model can be adapted for liquid crystal display dress Backlight put etc..In addition, as shown in Figure 2 B, planar light source device 100 can also be by (being shone with display units such as liquid crystal panels Penetrate component) 107 (in fig. 2b, being represented by dotted lines) combination, used as display device 100 '.Multiple light-emitting devices 200 are in shell It is configured on substrate 210 on the bottom plate 112 of body 110 latticed (in the present embodiment, being square net shape).Bottom plate 112 inner surface plays a role as diffusion reflecting surface.In addition, the top plate 114 of housing 110 is provided with opening portion.Light diffusing board 120 are configured in a manner of covering the opening portion, are played a role as light-emitting area.The size of light-emitting area for example can be about 400mm × about 700mm.

Multiple light-emitting devices 200 configure at certain intervals over the substrate 210 respectively.Multiple substrates 210 are individually fixed in shell Defined position on the bottom plate 112 of body 110.In the present embodiment, matched somebody with somebody with the centre of luminescence (light-emitting area) of light-emitting component 220 The mode of square net shape is set to, is configured with multiple light-emitting devices 200.Multiple light-emitting devices 200 include light-emitting component respectively 220 and flux control member 300.

Light-emitting component 220 is the light source of planar light source device 100, and installation is over the substrate 210.Light-emitting component 220 is, for example, white The light emitting diode (LED) of color light emitting diode etc..Light-emitting component 220 is configured to its centre of luminescence and is located on central shaft CA.

Flux control member 300 is lens, is fixed over the substrate 210.Flux control member 300 is controlled from light-emitting component The light distribution of 220 light projected, makes the direct of travel of the light be spread to the face direction of substrate 210.Flux control member 300 is with wherein Mode consistent with the optical axis OA of light-emitting component 220 mandrel CA, configures on light-emitting component 220 (with reference to Fig. 4).In addition, light beam Control unit 300 is configured to, and on the direction along the optical axis OA of light-emitting component 220, the centre of luminescence of light-emitting component 220 (shines Face) be located relative to following planes of incidence 320 near top the center of curvature (with reference to Fig. 4).It should illustrate that following light The plane of incidence 320 and exit facet 330 of beam control unit 300 are that (plane of incidence 320 is that circle is symmetrical to rotational symmetry, and exit facet 330 is Four sub-symmetries), and the rotation axis is consistent with the optical axis OA of light-emitting component 220.By the rotation of the plane of incidence 320 and exit facet 330 Axis is known as " the central shaft CA " of flux control member.In addition, " the optical axis OA " of light-emitting component refers to, carrys out self-emission device 220 The central ray of three-dimensional outgoing beam.

Flux control member 300 can be formed by being integrally formed.As long as the material of flux control member 300 can make the phase The material that the light of the wavelength of prestige passes through.For example, the material of flux control member 300 is polymethyl methacrylate (PMMA) Or the transmitance resin or glass of makrolon (PC), epoxy resin (EP), silicones etc..The area source of present embodiment The structure for being characterized mainly in that flux control member 300 of device 100.Then, the feature that should possess to flux control member 300 It is additionally carried out describing in detail.

Light diffusing board 120 is the plate-shaped member with light diffusivity, and the outgoing light diffusion for making to carry out selfluminous device 200 is simultaneously saturating Penetrate.Light diffusing board 120 is configured to, almost parallel in the top of multiple light-emitting devices 200 and substrate 210.Usual light diffusing board 120 is roughly the same with the size of the illuminated component such as liquid crystal panel.For example, light diffusing board 120 is by polymethyl methacrylate (PMMA), the light transmission such as makrolon (PC), polystyrene (PS), styrene-methylmethacrylate copolymer resin (MS) Property resin is formed.In order to assign light diffusing board 120 light diffusivity, on its surface formed with trickle bumps, or in light diffusing board 120 inner dispersion has the light-scattering bodies such as bead.

In the planar light source device 100 of the utility model, the light projected from each light-emitting component 220 is by flux control member 300 by irradiate light diffusing board 120 it is large-scale in a manner of spread.As described below, the light distribution characteristic of flux control member 300 is on edge It is different from the diagonal in arrangement grid the direction (X-direction and Y directions) of the arrangement grid of light-emitting device 200, therefore The inner surface of light diffusing board 120 is substantially evenly irradiated.The light quilt of light diffusing board 120 is reached from each flux control member 300 Diffuse and pass through light diffusing board 120.As a result the planar light source device 100 of the utility model can equably irradiate planar Illuminated portion's material (such as liquid crystal panel).

(structure of flux control member)

Fig. 5 A~Fig. 5 C are the figures of the structure of the flux control member 300 for the embodiment for representing the utility model.Figure 5A is the top view of flux control member 300, and Fig. 5 B are look up figure, and Fig. 5 C are the profiles of the line A-A shown in Fig. 5 A.

As shown in Fig. 5 A~Fig. 5 C, it is incidence that flux control member 300, which includes exit facet 330 and the inner surface of recess 310, Face 320.In addition, flux control member 300 can also include, for make the flange part easy to operation of flux control member 300, with And for forming the gap for making the heat sent from light-emitting component 220 be overflowed to outside and positioning flux control member 300 simultaneously Fixed foot's (equal illustration omitted) over the substrate 210.The plan view shape of the flux control member 300 of present embodiment is through R Chamfering it is generally square.

Recess 310 with the central shaft CA of flux control member 300 (the optical axis OA of light-emitting component 220) in a manner of intersecting It is configured at the central portion (with reference to Fig. 4) at the back side 305.The inner surface of recess 310 plays a role as the plane of incidence 320.That is, the plane of incidence 320 are configured to intersect with central shaft CA (optical axis OA).The plane of incidence 320 is to from most of light in the light that light-emitting component 220 projects Its direct of travel is controlled, and it is incident to the inside of flux control member 300.The plane of incidence 320 and flux control member 300 Central shaft CA intersect, and be rotation axis rotational symmetry (in the present embodiment for circle symmetrical) using central shaft CA.

The back side 305 is the rear side positioned at flux control member 300, from the opening edge of recess 310 to radially extending Plane.

Exit facet 330 is configured at the face side (120 side of light diffusing board) of flux control member 300.Exit facet 330 is to incidence To its direct of travel of the photocontrol in flux control member 300 and it is set to be projected to outside.Exit facet 330 and central shaft CA phases Hand over and using central shaft CA as rotation axis rotational symmetry (in the present embodiment for four sub-symmetries).

Exit facet 330 includes, positioned at first exit facet 330a, Yi Ji of the prescribed limit centered on central shaft CA The second exit facet 330b being formed continuously around first exit facet 330a.First exit facet 330a is that surface side of supporting or opposing is convex Curved surface.To the big of the curvature of the first exit facet 330a in the curvature and the second section of the first exit facet 330a in the first section It is small to be not particularly limited.In the present embodiment, in the curvature of the first exit facet 330a in the first section and the second section The curvature of first exit facet 330a is identical.It is outer comprising central shaft CA and exit facet 330 here, " the first section " refers to The section of point nearest edge middle-range central shaft CA, is the section of the line A-A in Fig. 5 A.In addition, " the second section " refers to, comprising in The section of point farthest the outer rim middle-range central shaft CA of mandrel CA and exit facet 330.It should illustrate that in the present embodiment, " the second section " is the first section is rotated the section after 45 ° by axis of central shaft CA, is the section of the line B-B in Fig. 5 A.

Second exit facet 330b is around the first exit facet 330a, to the convex smooth surface of face side. In addition, in the present embodiment, curvature and the second exit facet in the second section of the second exit facet 330b in the first section The curvature of 330b is different.Second exit facet 330b in the section comprising central shaft CA in away from the farthest position of central shaft have prolong Extending portion 330c.Here, " extension " refers to, and on the direction vertical with central shaft CA, the outboard end of the second exit facet 330b The part more prominent than the downside end along the second exit facet 330b on the direction of central shaft CA.In present embodiment In, by making the second exit facet 330b that there is extension 330c, so as to control and be：Phase in the light projected from light-emitting component 220 It can also serve as carrying out light diffusing board 120 (plane of illumination) light of effective lighting for the larger light of the angle of optical axis OA.

(light distribution characteristic of light-emitting device)

Fig. 6 A, Fig. 6 B are the index paths in light-emitting device 200.Fig. 6 A represent the light of the light-emitting device 200 in the first section Lu Tu, Fig. 6 B represent the index path of the light-emitting device 200 in the second section.It should illustrate that in Fig. 6 A, Fig. 6 B, in order to represent Light path, eliminates the hatching of light-emitting component 220 and flux control member 300.In addition, represent the light path shown in Fig. 6 A, Fig. 6 B Light represent injection angle from 0 ° to 80 ° in every 5 ° of each light.Also, in Fig. 6 A, Fig. 6 B, in order to represent light-emitting device 200 irradiated area, shows light diffusing board 120.

As shown in Fig. 6 A, Fig. 6 B, in the first section and the second section, projected from light-emitting component 220, injection angle ratio Less light is controlled as, and is spread and towards the middle body (light beam of irradiated area formed on light diffusing board 120 Region near the central shaft CA of control unit 300).Thus, the light projected from light-emitting device 200 will not make plane of illumination Middle body produced bright part but equably irradiated the middle body of plane of illumination.On the other hand, from light-emitting component 220 The light that the injection angle of injection is larger is controlled as while optically focused towards the end of irradiated area.Thus, from luminous dress The light for putting 220 injections is controlled as, and is being irradiated to the end for the irradiated area that should be illuminated by the emergent light of every lamp, and should When end is overlapping with the irradiated area of the emergent light from adjacent light-emitting device 220, with the central portion of irradiated area Light levels are identical.

The flux control member 300 of present embodiment can be determined from following two viewpoints.

【First viewpoint】

In the first viewpoint, for the more specifically shape of flux control member 300, flux control member 300 includes： The above-mentioned plane of incidence 320；And the above-mentioned exit facet 330 comprising above-mentioned first exit facet 330a and above-mentioned second exit facet 330b, And the first maximum for needing to make to be obtained according to " computational methods of the first maximum " is less than according to " the calculating side of the second maximum The second maximum that method " is obtained.

Here, " computational methods of the first maximum " and " computational methods of the second maximum " are illustrated.Fig. 7 is to use In explanation light emitting angle and the figure of injection angle.In the figure 7, the light path in the first section is represented.As shown in fig. 7, including light In first section of point nearest the central shaft CA of the beam control unit 300 and outer rim middle-range central shaft CA of exit facet 330, By direct of travels of any light L projected from the centre of luminescence between the centre of luminescence and the plane of incidence 320 relative to central shaft CA Angle be set to " light emitting angle θ 1A ", by direct of travel phases of any light L between exit facet 330 and plane of illumination 107 It is set to that " injection angle θ 3A ", in the present embodiment, " the first section " are the A-A shown in Fig. 5 A for the angle of central shaft CA The section of line.First section is the section of the straight line comprising two centres of luminescence adjacent with grid lines connection central shaft CA.

Similarly, illustration omitted, in the outer rim of the central shaft CA comprising flux control member 300 and exit facet 330 In the second section away from point farthest central shaft CA, by any light L projected from the centre of luminescence in the centre of luminescence and the plane of incidence Direct of travel between 320 is set to " light emitting angle θ 1B ", by any light L in exit facet relative to the angle of central shaft CA Direct of travel between 330 and plane of illumination 107 is set to " injection angle θ 3B " relative to the angle of central shaft CA.In this implementation In mode, " the second section " is the section of the line B-B shown in Fig. 5 A.Second section is comprising connection central shaft CA and unit grids Diagonal on adjacent two centres of luminescence straight line section.

Fig. 8 A, Fig. 8 B are the curve maps for illustrating the computational methods of the first maximum.Fig. 8 A are represented from light-emitting component The light emitting angle θ 1A and the first multinomial of the relation of the injection angle θ 3A of the light for the light that 220 centre of luminescence projects are near Like the curve map of function C1, Fig. 8 B are to represent first curve C1 ' corresponding with the first differential of the first polynomial approximation function C1 Curve map.The transverse axis of Fig. 8 A represents light emitting angle θ 1A (°), and the longitudinal axis represents injection angle θ 3A (°).In addition, the transverse axis of Fig. 8 B Represent light emitting angle θ 1A (°), the longitudinal axis represents the first differential value of injection angle θ 3A (°).

Fig. 9 A, Fig. 9 B are the curve maps for illustrating the computational methods of the second maximum.Fig. 9 A are represented from light-emitting component The light emitting angle θ 1B and the first multinomial of the relation of the injection angle θ 3B of the light for the light that 220 centre of luminescence projects are near Like the curve map of function C2, Fig. 9 B are to represent first curve C2 ' corresponding with the first differential of the first polynomial approximation function C2 Curve map.The transverse axis of Fig. 9 A represents light emitting angle θ 1B (°), and the longitudinal axis represents injection angle θ 3B (°).In addition, the transverse axis of Fig. 9 B Light emitting angle θ 1B (°), the longitudinal axis represent the first differential value of injection angle θ 3B (°).

The computational methods of first maximum are as follows.

(1) expression is obtained in the first section, from the light emitting angle θ 1A of any light L of centre of luminescence injection and this The first polynomial approximation function C1 of the relation of the injection angle θ 3A of meaning light L (with reference to Fig. 8 A).

(2) obtain the first curve C1 ' corresponding with the first differential of the first polynomial approximation function (with reference to Fig. 8 B).

(3) in the case where light emitting angle θ 1A are more than 40 °, using the maximum in the first curve C1 ' as the first maximum (with reference to Fig. 8 B).

In the present embodiment, the first maximum that can be obtained according to the method described above is about 0.5, light emitting angle at this time θ 1A are 40 ° (with reference to Fig. 8 B).

The computational methods of second maximum are as follows.

(1) expression is obtained in the second section, from the light emitting angle θ 1B of any light L of centre of luminescence injection and this The second polynomial approximation function C2 of the relation of the injection angle θ 3B of meaning light (with reference to Fig. 9 A).

(2) obtain the second curve C2 ' corresponding with the first differential of the second polynomial approximation function (with reference to Fig. 9 B).

(3) in the case where light emitting angle θ 1A are more than 40 °, using the maximum in the second curve C2 ' as the second maximum (with reference to Fig. 9 B).

In the present embodiment, the second maximum that can be obtained according to the method described above is about 1.2, light emitting angle at this time θ 2A are about 76 ° (with reference to Fig. 9 B).

In this way, " the second maximum is more than the first maximum " refers to, compared with the direction of the line A-A of Fig. 5 A, in line B-B On direction, the localized variation degree of the light and shade at the back side (plane of illumination 107) of light diffusing board 120 is larger.As explained further on that Sample, this is with being designed as mistake of the suppression to the irradiation area of the corner of the irradiation area at 120 back side of light diffusing board (plane of illumination 107) It is related to spend light irradiation.

Then, to the first section and the second section, 120 back side of light diffusing board (plane of illumination 107) irradiation area The position of end illustrates.Figure 10 is the irradiation area for illustrating the back side of light diffusing board 120 (plane of illumination 107) The figure of the position of end.In Fig. 10, it is represented by dashed line and has used flux control member 300 from 120 side of light diffusing board Irradiation area during planar light source device 100.

As shown in Figure 10, in the present embodiment, square net shape is configured to the centre of luminescence of light-emitting component 220 Mode, configures light-emitting device 200.Configured like this in a manner of the centre of luminescence of light-emitting component 220 is square net shape In the case of light-emitting device 200, plan view shape is configured to for the generally square flux control member 300 through R chamferings：With this Square net accordingly, the side of " the first section " (section of the line A-A of Fig. 5 A) along the unit grids of square net, The diagonal of " the second section " (section of the line B-B of Fig. 5 A) along the unit grids of square net.

In this case, the flux control member 300 (light-emitting device 200) of present embodiment meets following formula (1).

D1 ＜ P ＜ D2 formulas (1)

As shown in Figure 10, in formula (1), D1 is that adjacent on the side for the unit grids for connecting square net two shine The length (length of the half on one side of the unit grids of square net) of the half of the straight line at center.In addition, D2 is connection Length (the square net of the half of the straight line of two adjacent centres of luminescence on the diagonal of the unit grids of square net Unit grids cornerwise half length).Also, P be with light emitting angle θ 1B corresponding with the second maximum from shine The light that element 220 projects is in the intersection point at the back side of light diffusing board 120 and the distance of central shaft CA.As shown in Figure 10, P is determined The diagonally adjacent irradiations based on flux control member 300 (light-emitting device 200) of the unit grids of square net The position of the end in region.It should illustrate that projected with light emitting angle θ 1A corresponding with the first maximum from light-emitting component 220 Light is set to and D1 same lengths or shorter than D1 in the intersection point at the back side of light diffusing board 120 and the distance p of central shaft.

The utility model person has found, matches somebody with somebody in a manner of square net shape is configured to by the centre of luminescence of light-emitting component 220 In the case of putting light-emitting device 200, by adjusting (particularly the second exit facet of exit facet 330 of flux control member 300 Shape 330b) can suppress to produce bright portion at the back side of light diffusing board 120 (plane of illumination 107) to meet above-mentioned formula (1). The utility model person can speculate this is because, the generally square irradiation area formed by a light-emitting device 200 four The brightness of the brightness ratio other parts at angle is low, and four irradiation areas are based on so being difficult to produce near the central portion of unit grids Overlapping bright portion.

(effect)

As described previously for the flux control member 300 of present embodiment, since the second maximum is more than the first maximum Value, thus even in be configured to it is latticed in the case of, can also suppress the generation in the bright portion on plane of illumination.In addition, have Light-emitting device, planar light source device and the display device of the flux control member 300 can also suppress the generation in bright portion.

It should illustrate that in the present embodiment, the situation of square net is configured to the centre of luminescence of light-emitting component 220 Represented, but the utility model not limited to this, the centre of luminescence of light-emitting component 220 can also be configured to rectangular mesh. In the case of rectangular mesh, P is designed to, shorter than the length of cornerwise half of unit grids and longer than unit grids The length length of the half on side.

In addition, there can also be the easing portion for the generation for being used to further relax (suppression) bright portion on bottom plate 112.Figure 11 A It is the figure for illustrating easing portion 411A, Figure 11 B are the figures for illustrating other easing portion 411B.It should illustrate that Figure 11 A, In Figure 11 B, for the position of clear and definite easing portion 411A, 411B, light-emitting component 220 is shown in broken lines.

In the light projected from light-emitting component 220, a part of light is controlled and reached illuminated by flux control member 300 Face.In addition, from the light that light-emitting component 220 projects, the light of another part reaches bottom plate 112 by flux control member 300 Surface.The light for reaching the surface of bottom plate 112 is reflected to plane of illumination.In this way, due to the part in the light of arrival plane of illumination Light be bottom plate 112 reflect light, as long as so make bottom plate 112 reflect light reduce, it becomes possible to suppress plane of illumination The generation in bright portion.Therefore, easing portion 411A, 411B can become the light reflection of bright portion, bottom plate 112 at least in plane of illumination A part of region is formed.As shown in Figure 11 A, Figure 11 B, in the present embodiment, easing portion 411A, 411B is in unit grids Cornerwise near intersections are formed.The structure of easing portion 411A, 411B can suppress to reach on the surface of bottom plate 112 Light reflection in the range of it is appropriately designed.As shown in Figure 11 A, easing portion 411A can also be the black printing of not reflected light Part.In addition, shown in Figure 11 B, easing portion 411B can also cut the region for generating bright portion and form.

In addition, as described above, flux control member 300 can also have the foot for being used for being located and fixed within substrate 210 Portion.Figure 12 A~Figure 12 C are the bottom views of the flux control member 300 of variation.Figure 12 A are the Beam Control portions of variation 1 The bottom view of part 300, Figure 12 B are the bottom views of the flux control member 300 of variation 2, and Figure 12 C are the light beam controls of variation 3 The bottom view of component 300 processed.

The shape of foot 421A, 421B, 421C can suitably select in the range of it can play above-mentioned effect.For example, The shape of foot 421A, 421B, 421C can be cylindric or prism-shapeds.In the present embodiment, variation 1 The shape of the foot 421B of the foot 421A of flux control member 300 and the flux control member 300 of variation 2 is cylinder Shape.In addition, the foot 421C of the flux control member 300 of variation 3 is prism-shaped.In the case of these, foot 421A, 421B, 421C is bonded in substrate 210 by bonding agent etc..As illustrated in fig. 12, can also be in a manner of surrounding the plane of incidence 320, overleaf 305 three foot 421A of configuration.In addition, as shown in Figure 12 B, can also be in a manner of surrounding the plane of incidence 320, overleaf 305 match somebody with somebody Put four foot 421B.Also, as indicated in fig. 12 c, can also be in a manner of across the plane of incidence 320, overleaf 305 configuration two A foot 421C.It should illustrate that as shown in Figure 12 B, in the case where flux control member 300 is configured with four foot 421B, The three foot 421B that can also be only bonded in four foot 421B.In this way, by that with foot 421A, 421B, 421C, can prevent Only flux control member 300 relative to the installation direction of substrate 210 mistake.In addition, as shown in Figure 12 B and Figure 12 C, with light The central shaft CA of beam control unit 300 is the flux control member that pivot is symmetrically configured with foot 421B, 421C In 300, installation direction can be changed to each light-emitting device 200.Thus, can random arrangement planar light source device 100 used Multiple light-emitting devices 200 gate location, therefore the production of brightness disproportionation caused by cast gate when ejection formation can be suppressed It is raw.

【Second viewpoint】

In the second viewpoint, for the more specifically shape of flux control member 300, flux control member 300 includes：On State the plane of incidence 320；And the above-mentioned exit facet 330 comprising above-mentioned first exit facet 330a and above-mentioned second exit facet 330b, and Need formula (the 2)~formula (4) for meeting the description below.

Figure 13 A, Figure 13 B are the figures for formula (2)~formula (4).Figure 13 A are for formula (2) and formula (3) Figure, equivalent to the first above-mentioned section.Figure 13 B are the figures for formula (2) and formula (4), are cutd open equivalent to above-mentioned second Face.It should illustrate that in Figure 13 A, Figure 13 B, in order to simplify attached drawing, the light of the light from the injection of light-emitting component 220 is represented with straight line Road.

The flux control member 300 of present embodiment meets following formula (2) in the case where there：It is located at its centre of luminescence Mode on central shaft CA is arranged as opposed to light-emitting component 220 with recess 310, and is being emitted in a manner of intersecting with central shaft CA The top configuration plane of illumination in face 330.

In above-mentioned formula (2), D1 is that first obtained by following formula (3) reaches distance, which is to wrap In first section of point nearest the outer rim middle-range central shaft CA of CA containing central shaft and exit facet 330, with the first light emitting angle Point of arrival P3as of the first light L1 that θ 1a are projected from the centre of luminescence P0 of light-emitting component 220 on plane of illumination is away from central shaft CA Distance.D2 be by following formula (4) obtain second reach distance, this second arrival distance be comprising central shaft CA, with And in the second section of the farthest points of outer rim middle-range central shaft CA of exit facet 330, shone with the second light emitting angle θ 1b from described Point of arrival P3b distances away from central shaft CA of the second light L2 that the centre of luminescence P0 of element 220 is projected on plane of illumination.The One light emitting angle θ 1a are obtained by following " computational methods of the first light emitting angle ", and the second light emitting angle θ 1b pass through following " The computational methods of two light emitting angles " are obtained, and in the present embodiment, above-mentioned formula (2) represents the light projected from light-emitting component 220 not Reach the corner of the square irradiated area formed on plane of illumination (light diffusing board 120).

Here, the computational methods of the first arrival distance D1 are illustrated.First arrival distance D1 is by following formula (3) Obtain.

D1=h1atan θ 1a+h2atan θ 2a+h3atan θ 3a formulas (3)

As shown in FIG. 13A, the h1a in above-mentioned formula (3) is in the first section, and centre of luminescence P0 and the first light L1 exist Distance between incidence point i.e. the first incoming position P1a on the plane of incidence 320, on the direction along central shaft CA.H2a be In first section, the eye point of the first incoming position P1a and the first light L1 on exit facet 330 i.e. the first Exit positions P2a Between, distance on the direction along central shaft CA.H3a is the first Exit positions P2a and the first light in the first section Distance between the i.e. first illuminated position P3a of the point of arrivals of the L1 on plane of illumination, on the direction along central shaft CA.θ 1a is the direct of travel of the first light L1 between centre of luminescence P0 and the plane of incidence 320 relative to the angle of central shaft CA, i.e., One light emitting angle.θ 2a are the direct of travel phases of the first light L1 between the plane of incidence 320 and exit facet 330 in the first section For the angle of central shaft CA.θ 3a be in the first section, the first light L1's between exit facet 330 and plane of illumination Direct of travel relative to central shaft CA angle.That is, the first arrival distance D1 be in the first section, central shaft CA with to press The light that the first light emitting angle θ 1a that the method for stating calculates are projected on plane of illumination it is the first illuminated position P3a, with center Distance on direction orthogonal axis CA.

Then, the computational methods of the first light emitting angle θ 1a are illustrated.Figure 14 A, Figure 14 B are to be used to illustrate the first hair The curve map of the computational methods of angular θ 1a.Figure 14 A are the curve maps for representing the first polynomial approximation function C1, this more than first Item formula approximate function C1 represents the light emitting angle θ 1A of light and the penetrating for the light projected from the centre of luminescence of light-emitting component 220 Go out the relation of angle, θ 3A, Figure 14 B are to represent first curve C1 ' corresponding with the first differential of the first polynomial approximation function C1 Curve map.The transverse axis of Figure 14 A represents light emitting angle θ 1A (°), and the longitudinal axis represents light emitting angle θ 3A (°).In addition, the horizontal stroke of Figure 14 B Axis represents light emitting angle θ 1A (°), and the longitudinal axis represents the first differential value of light emitting angle θ 3A (°).

First light emitting angle θ 1a can be obtained by the following method.

(1) the first polynomial approximation function C1 (references of the relation for representing light emitting angle θ 1A and injection angle θ 3A are obtained Figure 14 A), wherein, light emitting angle θ 1A are nearest in the outer rim middle-range central shaft CA comprising central shaft CA and exit facet 330 In first section of point, from traveling side of any light between centre of luminescence P0 and the plane of incidence 320 that centre of luminescence P0 is projected To the angle relative to central shaft CA, injection angle θ 3A are the row of any light between exit facet 330 and plane of illumination Angle into direction relative to central shaft CA.

(2) obtain the first curve C1 ' corresponding with the first differential of the first polynomial approximation function (with reference to Figure 14 B).

(3) obtain the tangent slope of the first curve C1 ' and be changed into positive 1 or more than 2 bottom point and tangent slope from negative Change from positive to 1 or more than 2 negative vertex.It should illustrate that in Figure 14 B, bottom point is represented with solid arrow, with dotted arrow table Show vertex.

(4) bottom point to each 1 or more than 2, determines a vertex, the hair on the vertex from 1 or more than 2 vertex respectively Angular θ 1A are more than the light emitting angle θ 1A of the bottom point and closest to the light emitting angle θ 1A of the bottom point.That is, in the curve of Figure 14 B In figure, the vertex of the right side adjacent positioned at the bottom point is determined.

(5) determine the differential value Δ θ 3A's of the injection angle θ 3A between corresponding vertex from 1 or more than 2 bottom point Poor maximum bottom point, using the light emitting angle θ 1A of definite bottom point as the first light emitting angle θ 1a.

In the present embodiment, the first light emitting angle θ 1a that can be obtained according to the method described above are about 63 ° (with reference to figure 14B)。

The the first light emitting angle θ 1a tried to achieve as described above be in the first polynomial approximation function C1 shown in Figure 14 A tiltedly The angle of rate significantly change (with reference to Figure 14 A solid arrows).In the small regions of 1 to the first light emitting angle θ 1a of light emitting angle θ, The light projected from exit facet 330 is controlled as assembling.On the other hand, in area big 1 to the first light emitting angle θ 1a of light emitting angle θ In domain, the light projected from exit facet 330 is controlled as spreading.That is, in the first section, sent with the first light emitting angle θ 1a In-position of the light in irradiated area is bright portion and the border of dark portion.

Then, the computational methods of the second arrival distance D2 are illustrated.Second arrival distance D2 is by following formula (4) Obtain.

D2=h1btan θ 1b+h2btan θ 2b+h3btan θ 3b formulas (4)

As shown in Figure 13 B, the h1b in above-mentioned formula (4) is in the second section, and centre of luminescence P0 and the second light L2 exist Distance between incidence point i.e. the second incoming position P1b on the plane of incidence 320, on the direction along central shaft CA.H2b be In second section, the eye point of the second incoming position P1b and the second light L2 on exit facet 330 i.e. the second Exit positions P2b Between, distance on the direction along central shaft CA.H3a is the second Exit positions P2b and the second light in the second section Distance between the i.e. second illuminated position P3b of the point of arrivals of the L2 on plane of illumination, on the direction along central shaft CA.θ 1b is in the second section, and the direct of travel of the second light L2 between centre of luminescence P0 and the plane of incidence 320 is relative to central shaft The angle of CA, i.e. the second light emitting angle.θ 2b are the first light between the plane of incidence 320 and exit facet 330 in the second section The direct of travel of L2 relative to central shaft CA angle.θ 3b are in the second section, between exit facet 330 and plane of illumination The direct of travel of second light L2 relative to central shaft CA angle.That is, second arrival distance D3 be in the second section, in Second illuminated position of the light that mandrel CA and the second light emitting angle θ 1b to calculate as follows is projected on plane of illumination P3b, distance on the direction orthogonal with central shaft CA.

Then, the computational methods of the second light emitting angle θ 1b are illustrated.Figure 15 A, Figure 15 B are to be used to illustrate the second hair The curve map of the computational methods of angular θ 1b.Figure 15 A are the curve maps for representing the first polynomial approximation function C2, this more than first Item formula approximate function C2 represents the light emitting angle θ 1B of light and the penetrating for the light projected from the centre of luminescence of light-emitting component 220 Go out the relation of angle, θ 3B, Figure 15 B are to represent second curve C2 ' corresponding with the first differential of the second polynomial approximation function C2 Curve map.The transverse axis of Figure 15 A represents light emitting angle θ 1B (°), and the longitudinal axis represents light emitting angle θ 3B (°).In addition, the horizontal stroke of Figure 15 B Axis represents light emitting angle θ 1B (°), and the longitudinal axis represents the first differential value of light emitting angle θ 3B (°).

Second light emitting angle θ 1b can be obtained by the following method.

(1) the second polynomial approximation function of the relation for representing light emitting angle θ 1B and injection angle θ 3B is obtained, wherein, hair Angular θ 1B are the second sections in point farthest the outer rim middle-range central shaft CA comprising central shaft CA and exit facet 330 In, direct of travel of any light between centre of luminescence P0 and the plane of incidence 320 projected from centre of luminescence P0 is relative to center The angle of axis CA, injection angle θ 3B are the direct of travel of any light between exit facet 330 and plane of illumination in The angle of mandrel CA.

(2) obtain the first curve C2 ' corresponding with the first differential of the second polynomial approximation function (with reference to Figure 15 B).

(3) obtain the tangent slope of the second curve C ' from it is negative be changed into positive 1 or more than 2 bottom point and tangent slope from Just it is being changed into 1 or more than 2 negative vertex.It should illustrate that in Figure 15 B, represent bottom point with solid arrow, represented with dotted arrow Vertex.

(4) bottom point to each 1 or more than 2, determines a vertex, the hair on the vertex from 1 or more than 2 vertex respectively Angular θ 1B are more than the light emitting angle θ 1B of the bottom point and closest to the light emitting angle θ 1B of the bottom point.That is, in the curve of Figure 15 B In figure, the vertex of the right side adjacent positioned at the bottom point is determined.

(5) determine the differential value Δ θ 3B's of the injection angle θ 3B between corresponding vertex from 1 or more than 2 bottom point Poor maximum bottom point, using the light emitting angle θ 1B of definite bottom point as the second light emitting angle θ 1b.

In the present embodiment, the second light emitting angle θ 1b that can be obtained according to the method described above are about 65 ° (with reference to figure 15B)。

The the first light emitting angle θ 1b tried to achieve as described above be in the second polynomial approximation function C2 shown in Figure 15 A tiltedly The angle of rate significantly change (with reference to Figure 15 A solid arrows).In the small regions of 1 to the second light emitting angle θ 1b of light emitting angle θ, The light projected from exit facet 330 is controlled as assembling.On the other hand, in area big 1 to the second light emitting angle θ 1b of light emitting angle θ In domain, the light projected from exit facet 330 is controlled as spreading.That is, in the second section, sent with the second light emitting angle θ 2a In-position of the light in irradiated area is bright portion and the border of dark portion.

Represent big based on the above-mentioned formula (2) that the first light emitting angle θ 1a so tried to achieve and the second light emitting angle θ 1b are obtained Cause the corner of the irradiated area of square darker than other regions.

In above-mentioned example, for the first light emitting angle θ 1a and the second light emitting angle θ 1b, the second light emitting angle θ 1b than One light emitting angle θ 1a are big, but not limited to this, can also the first light emitting angle θ 1a it is bigger than the second light emitting angle θ 1b, Huo Zhe Two light emitting angle θ 1b are roughly the same with the first light emitting angle θ 1a.No matter which kind of situation, as long as meeting above-mentioned formula (2)~formula (4) With regard to desired light distribution characteristic can be obtained.

(brightness measuring of planar light source device)

Then, the Luminance Distribution of the planar light source device 100 to having used above-mentioned flux control member 300 is determined. Figure 16 is the curve map of the measurement result of the brightness in the plane of illumination (light diffusing board 120) for represent planar light source device 100.Figure 16 Transverse axis represent the distance (mm) at the center (central shaft CA) away from plane of illumination in the first section, the longitudinal axis represents brightness (cd/ m²).In this measurement, light diffusing board 120 (plane of illumination) configured in a manner of orthogonal with central shaft CA with 210 distance of substrate The position of 20mm.In addition, in this measurement, multiple light-emitting devices 200 are configured to square net shape, only make the dress that shines 200 are put to shine.

The face light of the flux control member 300 with the present embodiment for meeting above-mentioned formula (2)~(4) as shown in figure 16 Source device 100, as described below, can suppress on plane of illumination the generation in the bright portion of (light diffusing board 120).

(simulation)

The Luminance Distribution of planar light source device 100 to having used above-mentioned flux control member 300 is simulated.In this mould In plan, it is configured in multiple light-emitting devices 200 in latticed planar light source device 100, lights multiple light-emitting devices 200.Should Illustrate, as a comparison, (following to be also referred to as the planar light source device of the flux control member of rectangle to having used the shape of plane of illumination For " planar light source device of comparative example ") also carry out identical simulation.It should illustrate that the planar light source device 100 of present embodiment In the configuration of light-emitting device 200 it is identical with the configuration of the light-emitting device in the planar light source device of comparative example.

Figure 17 A are the figures of the analog result of the Luminance Distribution in the planar light source device for represent present embodiment, and Figure 17 B are tables Show the figure of the analog result of the Luminance Distribution in the planar light source device of comparative example.

As shown in Figure 17 A, the planar light source device 100 of present embodiment is suggested by the way that multiple light-emitting devices 200 are configured For square net shape (rectangular), the generation in (light diffusing board 120) bright portion can be suppressed on plane of illumination.This is considered as Due to the brightness of the brightness ratio other parts of the corner of the irradiated area in the plane of illumination that is irradiated by a light-emitting device 200 It is low, so even if partly overlapping with the irradiated area of adjacent light-emitting device 200, it is not easy to generate bright portion.

On the other hand, as seen in this fig. 17b, for the planar light source device of comparative example, since the shape of plane of illumination is rectangle, Therefore, the corner of the irradiated area of the light in each light-emitting device is overlapping, generates bright portion.

(effect)

To sum up, due to meeting above-mentioned formula (2)~(4), even in 300 quilt of flux control member of present embodiment Be configured to it is latticed in the case of, can also suppress the generation in the bright portion on plane of illumination.In addition, there is the flux control member 300 light-emitting device, planar light source device and display device, can also suppress the generation in the bright portion on plane of illumination.

Industrial applicibility

The flux control member, light-emitting device and planar light source device of the utility model can be adapted for for example, liquid crystal The backlight of showing device or general illumination etc..

Claims

A kind of 1. flux control member, for controlling the light distribution of the light projected from light-emitting component, it is characterised in that including：

The plane of incidence, its be in a manner of the central shaft with the flux control member intersects overleaf side formed recess interior table Face；And

Exit facet, it is configured at the opposite side of the plane of incidence,

The exit facet includes：First exit facet, it is configured in a manner of intersecting with the central shaft and surface side of supporting or opposing is convex； And second exit facet, it is configured and convex to face side in a manner of surrounding first exit facet,

Second exit facet in the section comprising the central shaft in there is extension away from the farthest position of the central shaft,

The plan view shape of the flux control member is through the generally square of R chamferings.
2. flux control member as claimed in claim 1, it is characterised in that：

The plane of incidence is circularly symmetric on the central shaft；And

The exit facet is in four sub-symmetries on the central shaft.
3. flux control member as claimed in claim 1, it is characterised in that：

In the first section and the second section, first exit facet has identical curvature, and second exit facet has not Same curvature,

First section is the nearest point of central shaft described in the outer rim middle-range comprising the central shaft and the exit facet Section,

Second section is the farthest point of central shaft described in the outer rim middle-range comprising the central shaft and the exit facet Section.
A kind of 4. light-emitting device, it is characterised in that including：

Light-emitting component；And

Flux control member described in any one of claims 1 to 3.
A kind of 5. planar light source device, it is characterised in that including：

Light-emitting device described in claim 4；And

Make the light diffusion from the light-emitting device and the light diffusing board transmitted.
A kind of 6. display device, it is characterised in that including：

Planar light source device described in claim 5；And

Illuminated portion's material of the illuminated light projected from the planar light source device.