JP2017103097A - Holding structure of light control element and surface light source device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a technology that stably holds a substrate and a light control element without bonding the substrate, on which light sources are mounted, to the light control element and providing a holding structure in the light control element.SOLUTION: A holding structure of a light control element 1 includes: a mounting substrate 2 on which LED elements 2a serving as light sources are mounted; a light control element 1 disposed above the LED elements 2a and having a recessed part 1a at a light entrance part; a housing 4 having an arrangement surface on which the mounting surface 2 is arranged; and holding parts 3b which protrude from the arrangement surface of the housing 4 to the side, on which the mounting substrate 2 is arranged, and hold the mounting substrate 2 and the light control element 1.SELECTED DRAWING: Figure 2

Description

  The present invention relates to an illumination device and a surface light source device used for a backlight light source of a display as an image display, and more particularly to a technique capable of stably holding a light distribution control element included in the surface light source device.

  In recent years, in a surface light source device mainly used for a backlight light source, it is a mainstream to use an LED element as a light source. In a direct type surface light source device in which a plurality of LED elements are arranged on the bottom surface of the casing (which corresponds to the back as a product), a light distribution control element is provided on the LED elements to diffuse light and irradiate the liquid crystal panel. ing.

  In addition, the light emission control element is roughly classified into a method of covering each of the plurality of LED elements arranged in a straight line and a method of covering the whole of the plurality of LED elements. (For example, see Patent Documents 1 to 3).

  In any of the above methods, the positional relationship between the LED element and the light emission control element is lost, which leads to luminance deterioration and color unevenness. Therefore, it is important to provide a holding structure that does not change the positional relationship between the two. In order to reliably obtain a bonding strength to the housing without destroying the positional relationship between the LED element and the light emission control element, a method of adhering the light emission control element to the mounting substrate using a dedicated jig is generally used.

  For example, in the technique described in Patent Document 4, an example in which a light emission control element is provided with a flange shape and is fixed to a mounting board using a screw, and an example in which a claw portion is provided in the light emission control element and is fixed to a mounting board having a hole. Is disclosed. Moreover, the convex shape which covers the external shape of an LED element as positioning is provided.

  For example, in the technique disclosed in Patent Document 5, the light distribution control element itself is held by having a shape that holds the mounting substrate by extrusion without using a member such as a screw or an adhesive. Moreover, although it can shape | mold also in injection molding, in the case of extrusion molding, it is possible to use the same cross section also in a large sized and a small backlight.

JP 2009-192915 A JP 2006-286608 A JP 2008-216540 A JP 2007-048883 A Japanese Utility Model Publication No. 6-38267

  The technologies described in Patent Document 1 and Patent Document 2 disclose only the optical performance of a light distribution control element that is elongated in a straight line, and hold the mounting substrate on which the LED element is mounted and the light distribution control element. The structure is not disclosed.

  In the technique described in Patent Document 3, when holding by bonding, a jig for positioning the mounting substrate having the LED element and the light distribution control element is required, and it is difficult to replace the mounting substrate after bonding. It is expensive when repairing.

  In the techniques described in Patent Document 4 and Patent Document 5, by providing the holding structure in the light distribution control element itself, there is an effect that the necessity of adhesion and screwing can be eliminated, and man-hours can be reduced. However, the light distribution control element does not have a shape considering only the optical characteristics, but the light distribution control element is provided with a holding structure, so that the light diffusion path becomes complicated and optical loss occurs. Therefore, there is a high possibility that it will lead to luminance degradation or color unevenness.

  Accordingly, the present invention stably holds the substrate and the light distribution control element without bonding the substrate on which the light source is mounted and the light distribution control element, or without providing a holding structure on the light distribution control element. The purpose is to provide a technology that can do this.

  The light distribution control element holding structure according to the present invention includes a substrate on which a light source is mounted, a light distribution control element disposed on the light source and having a recess in a light incident portion, and an arrangement in which the substrate is disposed. A housing having a surface, and a holding portion that protrudes from the placement surface of the housing to the side where the substrate is disposed and that retains the substrate and the light distribution control element.

  According to the present invention, the light distribution control element holding structure includes a substrate on which the light source is mounted, a light distribution control element that is disposed on the light source and has a recess in the light incident portion, and an arrangement in which the substrate is disposed. A housing having a surface, and a holding portion that protrudes from the housing placement surface to the side where the substrate is placed and holds the substrate and the light distribution control element.

  Therefore, the substrate and the light distribution control element can be stably held without bonding the substrate on which the light source is mounted and the light distribution control element, or without providing a holding structure in the light distribution control element. Further, since it is not necessary to provide a holding structure in the light distribution control element, it is possible to manufacture a light distribution control element that takes into consideration only optical characteristics.

4 is an exploded perspective view of a light distribution control element holding structure according to Embodiment 1. FIG. 3 is a perspective view of a light distribution control element holding structure according to Embodiment 1. FIG. It is sectional drawing of the mounting board | substrate with which the LED element in Embodiment 1 was mounted, and a light distribution control element. FIG. 3 is an enlarged perspective view of a mounting board in the first embodiment. FIG. 3 is a perspective view of a holding component in the first embodiment. 3 is a perspective view of a housing in the first embodiment. FIG. 3 is a plan view of a light distribution control element holding structure according to Embodiment 1. FIG. It is the sectional view on the AA line of FIG. It is the BB sectional drawing of FIG. 6 is an exploded perspective view of a light distribution control element holding structure according to Embodiment 2. FIG. 6 is a perspective view of a light distribution control element holding structure according to Embodiment 2. FIG. FIG. 10 is an enlarged perspective view of a housing in a second embodiment. 6 is an exploded perspective view of a light distribution control element holding structure according to Embodiment 3. FIG. 6 is a perspective view of a light distribution control element holding structure according to Embodiment 3. FIG. FIG. 10 is a perspective view of a holding component in a third embodiment. It is a perspective view of the holding structure of the mounting substrate which has the light distribution control element which concerns on a premise technique.

<Embodiment 1>
Embodiment 1 of the present invention will be described below with reference to the drawings. 1 is an exploded perspective view of a light distribution control element 1 holding structure according to Embodiment 1, FIG. 2 is a perspective view of a light distribution control element 1 holding structure, and FIG. 3 is an LED element 2a. 2 is a cross-sectional view of a mounting substrate 2 and a light distribution control element 1 on which is mounted. For ease of explanation, XYZ coordinate axes are appropriately shown in the drawing. Here, the + X direction and the −X direction are collectively referred to as the X axis direction, the + Y direction and the −Y direction are collectively referred to as the Y axis direction, and the + Z direction and the −Z direction are collectively referred to as the Z axis direction.

  As shown in FIGS. 1 and 2, a surface light source device mainly used for a backlight light source includes a light distribution control element 1 holding structure. The light distribution control element 1 holding structure includes a mounting substrate 2 (substrate), a light distribution control element 1, a housing 4, and a holding component 3. FIG. 3 is a cross-sectional view of the mounting substrate 2 on which the LED element 2a is mounted and the light distribution control element 1, and the positional relationship between the recess 1a of the light distribution control element 1 and the mounting substrate 2 on which the LED element 2a is mounted. Is shown.

  As shown in FIGS. 1 to 3, the light distribution control element 1 is formed in a rod shape and is placed on the LED element 2 a so as to cover the upper side (+ Z direction) of the mounting substrate 2 on which the LED element 2 a (light source) is mounted. Has been placed. The light distribution control element 1 has a concave portion 1a in the light incident portion in order to diffuse the light emitted from the LED element 2a, and the concave portion 1a extends over the longitudinal direction (X-axis direction) of the light distribution control element 1. Is formed. In FIG. 3, the holding component 3 is not shown for easy viewing of the drawing.

  Next, the mounting substrate 2 will be described with reference to FIGS. 1 and 4. FIG. 4 is an enlarged perspective view of the mounting substrate 2. The mounting substrate 2 is formed so as to extend in the X-axis direction, and a plurality of (for example, four) LED elements 2a are arranged on the mounting substrate 2 with a predetermined interval. A pair of holes 2b and 2c are formed at both ends in the longitudinal direction of the mounting substrate 2 in order from the end side.

  Next, the holding component 3 will be described with reference to FIGS. 1, 2, and 5. FIG. 5 is a perspective view of the holding component 3. The holding part 3 b of the holding component 3 protrudes from the arrangement surface of the housing 4 to the side where the mounting substrate 2 is arranged, and holds the mounting substrate 2 and the light distribution control element 1. The holding component 3 is formed of, for example, resin, and includes a circular design portion 3a, a pair of holding portions 3b, and convex portions 3e, 3f, and 3g in plan view. A pair of holding | maintenance part 3b and convex part 3e, 3f, 3g are integrally molded by the design part 3a so that it may protrude in the + Z direction from the design part 3a. The design portion 3a is attached to the surface of the housing 4 opposite to the surface on which the mounting substrate 2 is disposed. The design portion 3 a is formed in a shape larger than the opening 4 b so as to be able to cover the opening 4 b formed in the housing 4, and has a similar color to the housing 4.

  A pair of holding | maintenance part 3b is formed in U shape, and is arrange | positioned so that it may mutually oppose. A pair of holding | maintenance part 3b is equipped with both the nail | claw part 3c formed in the opposing side, and the engaging part 3d which protrudes in the other side of the nail | claw part 3c. In the pair of holding portions 3b, the side on which the engaging portion 3d is formed is connected to the design portion 3a, and the side on which the claw portion 3c is formed has a predetermined gap from the design portion 3a. 3c is configured to be elastically deformable in the Y-axis direction.

  Next, the housing 4 will be described with reference to FIGS. 1, 2, and 6. FIG. 6 is a perspective view of the housing 4. The casing 4 is made of, for example, metal in order to give the mounting board 2 a heat dissipation function. The housing 4 is formed in a shape that extends in the X-axis direction and opens in the + Z direction, and has a placement surface on which the mounting substrate 2 is placed. A pair of elongated holes 4e and holes 4c, 4d are formed in order from the end side at both ends of the arrangement surface of the housing 4, and a pair of engaged portions 4a and a pair of openings 4b are provided so as to sandwich the holes 4c. Are formed one by one. The pair of engaged portions 4a are formed at positions adjacent to the pair of openings 4b.

  Since the holding components 3 are respectively arranged at both ends in the longitudinal direction of the light distribution control element 1, the pair of holding portions 3b and the convex portions 4c are both ends in the longitudinal direction of the light distribution control element 1 in the design portion 3a. It arrange | positions in the position corresponding to a part. The pair of openings 4b of the housing 4 is formed in a shape larger than the outline in plan view of the pair of holding portions 3b so as to be rotatable in the horizontal direction in a state where the pair of holding portions 3b of the holding component 3 are inserted. The engaging portions 3d of the pair of holding portions 3b are arranged at positions that can be engaged with the pair of engaged portions 4a of the housing 4 in the design portion 3a. The elongated holes 4e, holes 4c, 4d of the housing 4 are formed in a shape larger than the convex portions 3f, 3e, 3g so that the convex portions 3f, 3e, 3g of the holding component 3 can be inserted therethrough.

  Next, holding of the light distribution control element 1 and the mounting substrate 2 by the holding component 3 will be described with reference to FIGS. 7, 8, and 9. 7 is a plan view of the holding structure of the light distribution control element 1, FIG. 8 is a cross-sectional view taken along line AA in FIG. 7, and FIG. 9 is a cross-sectional view taken along line BB in FIG.

  The holding component 3 is attached from the −Z side of the housing 4, and the holding component 3 is rotated in the horizontal direction around the hole 4 c and the convex portion 3 e with respect to the housing 4, thereby engaging the pair of holding portions 3 b. The part 3d engages with the pair of engaged parts 4a of the housing 4, and the holding component 3 is mounted. Further, the hole 4d and the convex portion 3g serve to prevent the holding component 3 from rotating back.

  As shown in FIGS. 1, 2, 7, 8, and 9, the convex portion 3 e of the holding component 3 positions the mounting substrate 2 and the light distribution control element 1 in the horizontal direction with respect to the arrangement surface of the housing 4. Is going. More specifically, the convex portion 3e has a shape along the concave portion 1a of the light distribution control element 1, and the convex portion 3e is inserted through the hole 4c of the housing 4 and the hole 2c of the mounting substrate 2. Thus, the mounting substrate 2 and the light distribution control element 1 are positioned in the horizontal direction with respect to the arrangement surface of the housing 4 by being inserted into the recess 1a of the light distribution control element 1. Thereby, the position of the mounting substrate 2 in the X direction and the Y direction and the position of the light distribution control element 1 in the Y direction are maintained. Moreover, since the convex part 3e does not approach the LED element 2a, the LED element 2a is not damaged. Furthermore, since the convex part 3e has a shape along the concave part 1a, it is possible to reliably hold the light distribution control element 1 in the Y-axis direction.

  Further, as shown in FIG. 9, the convex portion 3f of the holding component 3 is brought into contact with the end portion in the longitudinal direction of the light distribution control element 1 in a state of being inserted through the hole 2b and the long hole 4e. It is possible to position the control element 1 in the X-axis direction.

  The claw portions 3 c of the pair of holding portions 3 b position the mounting substrate 2 and the light distribution control element 1 in the vertical direction (Z-axis direction) with respect to the arrangement surface of the housing 4. More specifically, when the holding component 3 is mounted, the claw portions 3c of the pair of holding portions 3b abut on the end portions in the width direction of the light distribution control element 1 from the + Z direction, and the arrangement surface of the housing 4 The mounting substrate 2 and the light distribution control element 1 are positioned in the vertical direction. Since the claw portion 3c has an elastic force, it can be easily repaired after assembly and can be held even if the light distribution control element 1 has a complicated shape.

  As described above, the holding structure of the light distribution control element 1 according to Embodiment 1 is disposed on the mounting substrate 2 on which the LED element 2a is mounted, the LED element 2a, and the concave portion 1a in the light incident portion. A light distribution control element 1, a housing 4 having an arrangement surface on which the mounting substrate 2 is arranged, and a side where the mounting substrate 2 is arranged from the arrangement surface of the housing 4, and the mounting substrate 2 and the light distribution And a holding portion 3b for holding the control element 1. In addition, the surface light source device includes a holding structure for the light distribution control element 1.

  Therefore, the mounting substrate 2 and the light distribution control element 1 can be bonded to each other without bonding the mounting substrate 2 on which the LED element 2a is mounted and the light distribution control element 1 or providing the light distribution control element 1 with a holding structure. It can be held stably. Further, since it is not necessary to provide a holding structure in the light distribution control element 1, it is possible to manufacture the light distribution control element 1 considering only the optical characteristics.

  The mounting substrate 2 and the light distribution control element 1 are further provided with a convex portion 3e for positioning in the horizontal direction with respect to the arrangement surface of the housing 4, the light distribution control element 1 is formed in a rod shape, and the holding portion 3b and the convex portion 3e are It arrange | positions in the position corresponding to the both ends of the longitudinal direction of the light distribution control element 1. FIG. Therefore, the horizontal position of the mounting substrate 2 and the light distribution control element 1 can be more stably held at two locations.

  Since the convex portion 3e has a shape along the concave portion 1a of the light distribution control element 1, it is possible to reliably hold the light distribution control element 1 in the Y-axis direction. Since the holding part 3b has the claw part 3c which positions the mounting substrate 2 and the light distribution control element 1 in the vertical direction with respect to the arrangement surface of the housing 4, the vertical position of the light distribution control element 1 is reliably held. It can be carried out.

  Further, as shown in FIG. 16, in the base technology, the housing 103 is generally formed of metal in order to provide a heat dissipation function of the mounting substrate 102, and a light distribution control element is provided on the housing 103 side. In some cases, a holding portion 103a of the mounting substrate 102 is provided (held by a conventional technique such as adhesion). In this case, since the opening 103b is formed on the design surface of the housing 103 in the cut-and-raised shape, there is a problem that light leakage occurs from the arrangement surface side of the housing 103 and the design properties are further impaired. FIG. 16 is a perspective view of the holding structure of the mounting substrate 102 having the light distribution control element according to the base technology (held by a conventional technique such as adhesion).

  On the other hand, in the first embodiment, the holding portion 3b is integrally formed with the design portion 3a that is fixed to the surface of the housing 4 opposite to the placement surface on the side where the mounting substrate 2 is placed. The opening 4b can be covered with the design portion 3a. Thereby, it is possible to prevent light leakage. Moreover, since the design part 3a covers the opening 4b formed in the housing | casing 4 and the same color as the housing | casing 4 is given, the surface light source device which does not impair the design property is realizable.

<Embodiment 2>
Next, the holding structure of the light distribution control element 1 according to Embodiment 2 will be described. 10 is an exploded perspective view of the holding structure for the light distribution control element 1 according to the second embodiment, FIG. 11 is a perspective view of the holding structure for the light distribution control element 1, and FIG. FIG. In the second embodiment, the same components as those described in the first embodiment are denoted by the same reference numerals, and the description thereof is omitted.

  As shown in FIGS. 10, 11, and 12, the holding structure for the light distribution control element 1 according to the second embodiment includes the mounting substrate 2, the light distribution control element 1, and the housing 5. In the first embodiment, the housing 4 (see FIG. 1) is made of metal in order to provide the heat dissipation function of the mounting substrate 2, but in the second embodiment, the housing 5 is made of resin. Further, in the holding structure of the light distribution control element 1 according to the second embodiment, instead of including the holding component 3 (see FIG. 1), the resin casing 5 has a pair of holding portions 5b and convex portions 5d and 5e. I have.

  A pair of holding | maintenance part 5b and convex part 5d, 5e are arrange | positioned at the both ends of the longitudinal direction of the housing | casing 5, and a pair of holding | maintenance part 5b, convex part 5d, 5e, and the housing | casing 5 are integrally molded. A pair of holding | maintenance part 5b is formed in U shape, and is arrange | positioned so that it may mutually oppose. A pair of holding | maintenance part 5b is equipped with the nail | claw part 5c formed in the opposing side. In the pair of holding portions 5b, the side opposite to the side on which the claw portion 5c is formed is connected to the arrangement surface 5a of the housing 5, and the side on which the claw portion 5c is formed is from the arrangement surface 5a of the housing 5. It has a predetermined gap and the claw portion 5c is configured to be elastically deformable in the Y-axis direction.

  The convex portions 5 d and 5 e position the mounting substrate 2 and the light distribution control element 1 in the horizontal direction with respect to the arrangement surface 5 a of the housing 5, and the claw portions 5 c included in the pair of holding portions 5 b are arranged on the arrangement surface of the housing 5. The mounting substrate 2 and the light distribution control element 1 are positioned in the vertical direction with respect to 5a.

  As described above, in the holding structure for the light distribution control element 1 according to the second embodiment, since the holding portion 5b and the housing 5 are integrally molded, the number of parts can be reduced as compared with the case of the first embodiment. This can reduce the manufacturing cost of the surface light source device.

<Embodiment 3>
Next, the holding structure of the light distribution control element 1 according to Embodiment 3 will be described. 13 is an exploded perspective view of the holding structure of the light distribution control element 1 according to Embodiment 3, FIG. 14 is a perspective view of the holding structure of the light distribution control element 1, and FIG. FIG. In the third embodiment, the same components as those described in the first and second embodiments are denoted by the same reference numerals, and the description thereof is omitted.

  When the surface light source device is used as a backlight light source of a large display, since the length of the light distribution control element 1 in the longitudinal direction (X-axis direction) is extended, only both ends in the longitudinal direction of the light distribution control element 1 are used. There is a possibility that appropriate holding strength cannot be obtained only by holding. Therefore, in the third embodiment, as shown in FIGS. 13 and 14, the holding component 6 is further arranged at a position corresponding to the central portion in the longitudinal direction of the light distribution control element 1. In FIG. 13, only three holding parts 3 and one holding part 6 are shown, but actually, as shown in FIG. 14, there are four holding parts 3 and two holding parts 6. Used.

  As shown in FIG. 15, the holding component 6 is formed of, for example, resin, and includes a design portion 6a, a pair of holding portions 6b, and convex portions 6e and 6f. A pair of holding | maintenance part 6b and convex part 6e, 6f are integrally molded by the design part 6a so that it may protrude in the + Z direction from the design part 6a. The design portion 6a is fixed to a surface of the housing 4 opposite to the arrangement surface on the side where the mounting substrate 2 is arranged.

  A pair of holding | maintenance part 6b is formed in a U shape, and is arrange | positioned so that it may mutually oppose. A pair of holding | maintenance part 6b is equipped with both the nail | claw part 6c formed in the opposing side, and the engaging part 6d which protrudes in the other side of the nail | claw part 6c. In the pair of holding portions 6b, the side where the engaging portion 6d is formed is connected to the design portion 6a, and the side where the claw portion 6c is formed has a predetermined gap from the design portion 6a. 6c is configured to be elastically deformable in the Y-axis direction.

  The holding component 6 does not include a convex portion corresponding to the convex portion 3 f of the holding component 3 in the first embodiment. This is because, if the holding component 3 is disposed at a position corresponding to the central portion in the longitudinal direction of the light distribution control element 1, the convex portion 3f has a larger dimension in the Z-axis direction than the concave portion 1a of the light distribution control element 1. This is because the holding component 3 cannot be mounted due to interference with the light distribution control element 1. In addition, it is also possible to provide a pair of holding portions and two convex portions in the central portion in the longitudinal direction of the housing 5 in the second embodiment.

  As described above, in the holding structure for the light distribution control element 1 according to the third embodiment, the holding portion 6b is further arranged at a position corresponding to the central portion of the light distribution control element 1 in the longitudinal direction. Appropriate holding strength can be obtained even when the apparatus is used as a backlight light source of a large display.

  It should be noted that the present invention can be freely combined with each other within the scope of the invention, and each embodiment can be appropriately modified or omitted.

  DESCRIPTION OF SYMBOLS 1 Light distribution control element, 1a recessed part, 2 mounting board, 2a LED element, 3a design part, 3b holding part, 3c claw part, 3e convex part, 3f convex part, 4 housing | casing, 4b opening, 5 housing | casing, 5b holding | maintenance Part, 5c claw part, 5d convex part, 5e convex part, 6b holding part, 6c claw part, 6e convex part.

Claims (9)

A substrate on which a light source is mounted;
A light distribution control element disposed on the light source and having a recess in the light incident portion;
A housing having a placement surface on which the substrate is placed;
A holding portion that protrudes from the arrangement surface of the housing to the side where the substrate is arranged, and that holds the substrate and the light distribution control element;
A light distribution control element holding structure. A convex portion that performs horizontal positioning of the substrate and the light distribution control element with respect to the arrangement surface of the housing;
The light distribution control element is formed in a rod shape,
The light distribution control element holding structure according to claim 1, wherein the holding part and the convex part are arranged at positions corresponding to both ends of the light distribution control element in a longitudinal direction.   The light distribution control element holding structure according to claim 2, wherein the convex portion has a shape along the concave portion of the light distribution control element.   The light distribution control element holding structure according to claim 2, wherein the holding portion is further arranged at a position corresponding to a central portion in a longitudinal direction of the light distribution control element.   The light distribution according to any one of claims 2 to 4, wherein the holding portion includes a claw portion that performs vertical positioning of the substrate and the light distribution control element with respect to the arrangement surface of the housing. Control element holding structure.   The light distribution control element holding structure according to claim 1, wherein the holding portion is integrally formed with a design portion that is fixed to a surface opposite to the arrangement surface on the side where the substrate is arranged in the housing. .   The light distribution control element holding structure according to claim 6, wherein the design portion covers an opening formed in the housing and is provided with a color similar to that of the housing.   The light distribution control element holding structure according to claim 1, wherein the holding portion and the housing are integrally molded.   A surface light source device comprising the light distribution control element holding structure according to claim 1.

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