JP2018098117A - Lighting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lighting device capable of being easily assembled.SOLUTION: A lighting device includes an LED mounting substrate 4a on which an LED 3 is mounted, an LED driving substrate 5 on which a driving circuit of the LED 3 is mounted, a connection substrate 4b for connecting the LED mounting substrate 4a and the LED driving substrate 5, and an accommodation portion 8a in which a substrate set 12 composed of the LED mounting substrate 4a, the LED driving substrate 5, and the connection substrate 4b, is accommodated. The accommodation portion 8a includes a bottom face portion 8c, and a side face portion 8e raised from the bottom face portion 8c and opposed to a face at a side opposite to a face on which the LED 3 is mounted, of the LED mounting substrate 4a. In the lighting device, a first positioning portion 18 for positioning the substrate set 12 to the accommodation portion 8a in a Y direction, is composed of the LED mounting substrate 4a and the accommodation portion 8a, and a second positioning portion 19 for positioning the substrate set 12 to the accommodation portion 8a in a X direction, is composed of the connection substrate 4b and the accommodation portion 8a.SELECTED DRAWING: Figure 6

Description

  The present invention relates to a lighting device.

  The present applicant has proposed a flat illuminating device designed so that the brightness of the light exit surface is uniform as a whole including the peripheral portion (see, for example, Patent Document 1). The illumination device described in Patent Document 1 includes a light guide plate, a plurality of LED light sources that emit light toward an end surface of the light guide plate, an LED substrate on which the LED light sources are mounted, a frame that supports the LED substrate, A diffusion plate is disposed on one side of the light guide plate in the thickness direction of the light plate and diffuses light emitted from the light guide plate, and a reflection plate is disposed on the other side of the light guide plate in the thickness direction of the light guide plate.

  In the illumination device described in Patent Document 1, the frame includes a base portion disposed so as to face the end face of the light guide plate, and two light shields extending from both ends of the base portion in the thickness direction of the light guide plate toward the light guide plate. Department. The frame is attached to the light guide plate and the reflection plate with the light guide plate and the reflection plate sandwiched between the two light shielding portions, and the LED substrate is disposed between the end surface of the light guide plate and the base portion. Has been. Moreover, the LED substrate, the light guide plate, the reflection plate, and the frame are accommodated in a holding case. The holding case is formed in a box shape that opens on one side in the thickness direction of the light guide plate, and the opening of the holding case is closed by a diffusion plate.

JP 2014-150049 A

  In the illumination device such as the illumination device described in Patent Document 1, it is preferable that the assembly operation of the illumination device is easy. Then, the subject of this invention is providing the illuminating device which can be assembled easily.

  In order to solve the above problems, an illumination device of the present invention includes an LED, an LED mounting board on which the LED is mounted, an LED driving board on which an LED driving circuit is mounted, an LED mounting board, and an LED driving board. A connection board to be connected and a housing having a housing part formed in a flat box shape, the LED is mounted on one surface of the LED mounting board, the connection board is a flexible printed circuit board, and the housing part One surface in the flat direction is open, and the housing portion accommodates the board set and the LED configured by the LED mounting substrate, the LED driving substrate, and the connection substrate, and the housing portion is the other in the flat direction. And a side surface of the LED mounting substrate opposite to the surface on which the LED is mounted, which is opposite to the surface on which the LED is mounted, is formed so as to rise from the bottom surface to one side in the flat direction. Department and Provided, when the opposite direction of the anti-mounting surface and the side surface portion is the first direction, and the direction perpendicular to the flat direction and the first direction is the second direction, at least one of the LED mounting substrate and the connection substrate is accommodated. The first positioning portion for positioning the substrate set with respect to the housing portion in the second direction is configured by the portion, and the housing portion in the first direction is formed by at least one of the LED driving substrate and the connection substrate, and the housing portion. A second positioning portion for positioning the substrate set is configured.

  In the illuminating device of the present invention, a first positioning portion that positions the substrate set with respect to the housing portion in the second direction is configured by at least one of the LED mounting substrate and the connection substrate and the housing portion, and the LED driving substrate. And the 2nd positioning part which positions a board | substrate group with respect to an accommodating part in a 1st direction is comprised by at least any one of a connection board | substrate, and an accommodating part. Therefore, in the present invention, the first positioning portion allows the substrate set to be easily positioned with respect to the accommodating portion in the second direction, and the second positioning portion allows the substrate set to be aligned with respect to the accommodating portion in the first direction. The board set can be easily positioned. Therefore, according to the present invention, the lighting device can be easily assembled.

  In the present invention, for example, the LED mounting substrate is formed in a substantially rectangular shape elongated in the second direction, and the first positioning portion is configured by both end surfaces of the LED mounting substrate in the second direction and a receiving portion. In this case, for example, the first positioning portion projects from both end surfaces in the second direction of the LED mounting substrate and both end surfaces in the second direction of the LED mounting substrate while protruding from the bottom surface to one side in the flat direction. It is comprised from the 1st projection part which contacts.

  In the present invention, for example, the connection substrate extends from the LED mounting substrate toward one side in the first direction, and extends in a second direction from the connection portion and a strip-shaped connection portion that connects the LED mounting substrate and the LED driving substrate. The second positioning portion includes both end surfaces in the first direction of the extension portion and both end surfaces in the first direction of the extension portion while projecting from the bottom surface to one side in the flat direction. It is comprised from the 2nd projection part which contacts.

  In this case, it is preferable that the connection substrate is formed in a cross shape having two extension portions extending from the connection portion to both sides in the second direction. If comprised in this way, it will become possible to position a board | substrate set reliably with respect to an accommodating part in a 1st direction using two extension parts and a 2nd projection part.

  In the present invention, the LED drive substrate is accommodated in the accommodating portion so that the thickness direction and the flat direction of the LED drive substrate coincide with each other, and the connection substrate is pulled out from the other side of the flat direction of the LED mounting substrate, It is preferable to be connected to the other surface of the LED driving substrate in the flat direction. When configured in this manner, the connection board can be routed along the bottom surface portion.For example, when the connection board is pulled out from one side of the flat direction of the LED mounting board, Compared with the case where the connection substrate is connected to one surface in the flat direction, the accommodation state of the substrate set accommodated in the accommodation portion can be stabilized. Therefore, it becomes possible to easily incorporate the board set into the accommodating portion.

  In the present invention, it is preferable that the lighting device includes a restricting portion that restricts movement of the connection substrate routed along the bottom surface portion to one side in the flat direction. If comprised in this way, since the movement to the one side of the flat direction of the connection board accommodated in an accommodating part will be prevented by a control part, it will become possible to incorporate a board | substrate group with respect to an accommodating part easily.

  In the present invention, the connection board extends from the LED mounting board toward one side in the first direction and includes a strip-like connection part that connects the LED mounting board and the LED driving board, and the regulating part is a second part of the connection part. Both end surfaces in the direction and third projecting portions that project from the bottom surface to one side in the flat direction and contact each of both end surfaces in the second direction of the connection portion, and one end surface of the connection portion in the second direction The distance in the second direction between the third protrusion contacting the second protrusion and the third protrusion contacting the other end surface in the second direction of the connection portion may be shorter than the width of the connection portion in the second direction. preferable. If comprised in this way, it will become possible to prevent a connection board from moving to the one side of a flat direction by the comparatively simple structure using the 3rd projection part which protrudes from a bottom face part.

  In the present invention, the connection board includes a strip-like connection part that extends from the LED mounting board toward one side in the first direction and connects the LED mounting board and the LED driving board, and the LED of the connection part in the first direction is provided. The length of the portion between the mounting board and the LED driving board is preferably longer than the distance between the LED mounting board and the LED driving board in the first direction. If comprised in this way, it will become possible to bend the connection part of the connection board which is a flexible printed circuit board, and the LED mounting board can be pressed toward a side part using the restoring force of the bent connection part. It becomes possible. Therefore, it becomes possible to stabilize the accommodation state of the LED mounting substrate accommodated in the accommodating portion, and as a result, it becomes possible to easily incorporate the board set into the accommodating portion.

  As described above, according to the present invention, the lighting device can be easily assembled.

It is a perspective view of the illuminating device concerning embodiment of this invention. It is a disassembled perspective view of the illuminating device shown in FIG. It is sectional drawing of the illuminating device shown in FIG. FIG. 3 is a perspective view showing the diffusion plate shown in FIG. 2 from the opposite side. FIG. 3 is a perspective view of the housing shown in FIG. 2. It is a top view for demonstrating the state by which the board | substrate group was attached to the accommodating part of the housing shown in FIG. FIG. 3 is a perspective view showing the board set shown in FIG. 2 from the opposite side. It is a top view for demonstrating the structure of the light-guide plate shown in FIG. (A) is an enlarged view of the E part of FIG. 8, (B) is an enlarged view of the F part of FIG. 8, (C) is an enlarged view of the G part of FIG. ) Is an enlarged view of a portion H in FIG. (A) is an enlarged view of a portion J in FIG. 3, and (B) is an enlarged view of a portion K in FIG. (A) is sectional drawing for demonstrating the structure of the right end part of the illuminating device shown in FIG. 1, (B) is sectional drawing for demonstrating the structure of the left end part of the illuminating device shown in FIG. is there.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(Schematic configuration of lighting device)
FIG. 1 is a perspective view of a lighting device 1 according to an embodiment of the present invention. FIG. 2 is an exploded perspective view of the lighting device 1 shown in FIG. FIG. 3 is a cross-sectional view of the lighting device 1 shown in FIG.

  The illuminating device 1 of this form is a light-emitting device designed so that the brightness of the light emission surface 6a of the illuminating device 1 may become uniform as a whole including a peripheral part. This illuminating device 1 is formed in a substantially flat plate shape as a whole. Moreover, the shape of the illuminating device 1 when it sees from the direction orthogonal to the light emission surface 6a formed in planar shape is square shape.

  In the following description, the direction perpendicular to the light exit surface 6a (the Z direction in FIG. 1 and the like) is referred to as “vertical direction”, and is a direction perpendicular to the vertical direction and parallel to one side of the lighting device 1 having a square shape. (X direction in FIG. 1 etc.) is referred to as “front-rear direction”, and a direction (Y direction in FIG. 1) perpendicular to the up-down direction and the front-rear direction is referred to as “left-right direction”. Also, the light emitting surface 6a side (the Z1 direction side in FIG. 1 etc.) of the vertical direction is the “upper” side, and the Z2 direction side in FIG. The X1 direction side of FIG. 1 or the like that is one side is the “front” side, the X2 direction side of FIG. 1 or the like that is the opposite side is the “rear” side, and the Y1 direction of FIG. The side is the “right” side, and the opposite Y2 direction side in FIG. 1 is the “left” side.

  The illumination device 1 includes a light guide plate 2, a plurality of LEDs (Light Emitting Diodes) 3 that emit light toward the light guide plate 2, two substrates 4 and 5, and a light guide plate disposed above the light guide plate 2. 2 is provided with a diffusion plate 6 that diffuses the light emitted by 2 and a reflection plate 7 that reflects the light emitted by the light guide plate 2. Moreover, the illuminating device 1 includes a housing 8 in which the light guide plate 2 and the like are accommodated and the diffusion plate 6 is fixed.

  The housing 8 includes a housing portion 8a in which the light guide plate 2, the LED 3, the substrates 4, 5 and the reflecting plate 7 are housed, and a terminal mounting portion 8b to which the connection terminal 9 is attached. As shown in FIG. 3, the accommodating portion 8 a constitutes the upper portion of the housing 8, and the terminal attachment portion 8 b constitutes the lower portion of the housing 8. The housing 8 is integrally formed of a metal having a high thermal conductivity such as an aluminum alloy, and functions to dissipate heat generated by the LED 3. The accommodating portion 8a is formed in a flat rectangular parallelepiped box shape with a small thickness in the vertical direction. That is, the vertical direction (Z direction) of the present embodiment is the flat direction of the housing portion 8a. Further, the upward direction (Z1 direction) of this embodiment is one of the flat directions, and the downward direction (Z2 direction) is the other of the flat directions.

  The accommodating portion 8a includes a bottom surface portion 8c constituting the lower surface of the accommodating portion 8a and a side wall portion 8d formed so as to rise upward from the bottom surface portion 8c. The upper surface of the accommodating portion 8a is opened. Yes. The bottom surface portion 8c is formed in a square flat plate shape. The side wall portion 8d is formed in a flat rectangular tube shape. The shape of the outer peripheral surface of the side wall portion 8d when viewed from the vertical direction is a square shape. The outer peripheral surface of the side wall 8d is parallel to the front-rear direction or the left-right direction. The outer peripheral surface of the side wall 8d constitutes the outer peripheral surface of the accommodating portion 8a. That is, the side wall part 8d constitutes the outer peripheral surface of the accommodating part 8a. The terminal attachment portion 8b protrudes downward from the center portion of the bottom surface portion 8c. A through hole penetrating in the vertical direction is formed at the center of the bottom surface portion 8c. The detailed configuration of the accommodating portion 8a will be described later.

  The light guide plate 2 is made of an acrylic resin having a high light transmittance. The light guide plate 2 is a light scattering light guide containing a large number of light scattering particles that are spherical particles, and light incident on the light guide plate 2 is scattered by the light scattering particles in the light guide plate 2. The light scattering particles contained in the light guide plate 2 are formed of, for example, silicone particles disclosed in Japanese Patent Application Laid-Open No. 2014-150049. The light guide plate 2 is formed in a square flat plate shape.

  The light guide plate 2 is accommodated in the accommodating portion 8a so that the thickness direction of the light guide plate 2 matches the vertical direction. The outer peripheral surface of the light guide plate 2 is parallel to the front-rear direction or the left-right direction. That is, the light guide plate 2 is formed with two end faces 2a, 2b orthogonal to the front-rear direction and two end faces 2c, 2d orthogonal to the left-right direction. The light guide plate 2 has end faces 2a, 2b. It is accommodated in the accommodating portion 8a so as to be parallel to the left-right direction and the end faces 2c, 2d to be parallel to the front-rear direction. In this embodiment, the end surface 2a is the rear end surface of the light guide plate 2, the end surface 2b is the front end surface of the light guide plate 2, the end surface 2c is the right end surface of the light guide plate 2, and the end surface 2d is guided. This is the left end surface of the light plate 2. The upper surface of the light guide plate 2 is a light exit surface 2 e of the light guide plate 2. A detailed configuration of the light guide plate 2 will be described later.

  The substrate 5 is a rigid substrate such as a glass epoxy substrate. The substrate 5 is formed in a rectangular flat plate shape. A drive circuit for the LED 3 is mounted on the substrate 5. In the following description, the substrate 5 is referred to as “LED drive substrate 5”. The substrate 4 is a flexible printed circuit board. The substrate 4 includes an LED mounting substrate 4a on which a plurality of LEDs 3 are mounted, and a connection substrate 4b that connects the LED mounting substrate 4a and the LED driving substrate 5. In this embodiment, a board set 12 is configured by the LED mounting board 4a, the connection board 4b, and the LED drive board 5, and the board set 12 is accommodated in the accommodating portion 8a. The detailed configuration of the board set 12 will be described later.

  The diffusion plate 6 is made of an acrylic resin or polycarbonate having a high light transmittance. The diffusion plate 6 is a light scattering light guide containing a large number of light scattering particles, and light incident on the diffusion plate 6 is scattered by the light scattering particles in the diffusion plate 6. The diffusion plate 6 contains light scattering particles similar to the light scattering particles contained in the light guide plate 2. That is, the light scattering particles contained in the diffusing plate 6 are formed of, for example, silicone particles disclosed in Japanese Patent Application Laid-Open No. 2014-150049.

  The diffusion plate 6 is formed in a square plate shape. As described above, the light guide plate 2 is formed in a square flat plate shape, and the outer shape of the diffusion plate 6 is slightly larger than the outer shape of the light guide plate 2. That is, the shape of the diffusion plate 6 is substantially similar to the shape of the light guide plate 2. The diffusing plate 6 is formed in a substantially flat plate shape, and is arranged so that the thickness direction of the diffusing plate 6 coincides with the vertical direction. Further, the diffusion plate 6 is fixed to the housing 8. Specifically, the diffusing plate 6 is fixed to the upper end of the side wall portion 8d, and closes the opening of the accommodating portion 8a.

  The diffusion plate 6 is fixed to the housing 8 by four screws 14. That is, the lighting device 1 includes four screws 14 for fixing the diffusion plate 6 and the housing 8. Each of the four screws 14 is disposed at each of the four corners of the diffusion plate 6. The detailed configuration of the diffusion plate 6 will be described later.

  The reflection plate 7 is formed by bending a thin plate-like member into a predetermined shape. The reflection plate 7 includes a reflection portion 7 a that reflects light emitted from the lower surface of the light guide plate 2, a reflection portion 7 b that reflects light emitted from the end surface 2 b of the light guide plate 2, and an end surface 2 c of the light guide plate 2. The reflecting portion 7c reflects the emitted light, and the reflecting portion 7d reflects the light emitted from the end surface 2d of the light guide plate 2. The detailed configuration of the reflecting plate 7 will be described later.

(Diffusion plate configuration)
FIG. 4 is a perspective view showing the diffusion plate 6 shown in FIG. 2 from the opposite side.

  As described above, the diffusing plate 6 is formed in a substantially square plate shape, and is arranged so that the thickness direction of the diffusing plate 6 coincides with the vertical direction. The outer peripheral surface of the diffusion plate 6 is parallel to the front-rear direction or the left-right direction. When viewed from above and below, the corners of the diffusion plate 6 and the corners of the light guide plate 2 overlap. That is, when viewed from above and below, each of the four corners of the diffusion plate 6 and each of the four corners of the light guide plate 2 overlap.

  The upper surface of the diffusion plate 6 is a light exit surface 6 a of the diffusion plate 6. The light emission surface 6 a is a light emission surface of the lighting device 1. When the light diffusing plate 6 is viewed from directly above the light exit surface 6a (that is, when viewed from the direction orthogonal to the light exit surface 6a), the diffuser plate 6 is in the outer shape of the light exit surface 6a. The size is such that the components of the lighting device 1 can be accommodated. The diffusion plate 6 is disposed on the upper side of the light guide plate 2. That is, the diffusion plate 6 is disposed on the light exit surface 2 e side of the light guide plate 2.

  The diffusion plate 6 includes a protruding portion 6b that protrudes toward the light guide plate 2 (that is, protrudes downward). The protrusion 6b is formed along the outer peripheral surface of the diffusion plate 6, and is formed in a square frame shape. The inner side surface in the front-rear direction of the protrusion 6b is a plane orthogonal to the front-rear direction, and the inner side surface in the left-right direction of the protrusion 6b is a plane orthogonal to the left-right direction. The lower surface of the protrusion 6b is a plane orthogonal to the vertical direction. The inner part in the front-rear direction and the inner part in the left-right direction on the lower surface of the protrusion 6b formed in a square frame shape are the outer part in the front-rear direction and the outer part in the left-right direction of the light exit surface 2e of the light guide plate 2. In contact.

  A portion of the lower surface of the protruding portion 6b that contacts the light emitting surface 2e is a light incident surface on which light is incident. The inside of the protrusion 6b is a square-shaped recess 6f that is recessed upward, and the diffuser 6 has a space surrounded by the protrusion 6b. The bottom surface of the recess 6f is a light incident surface 6g on which light emitted from the light emitting surface 2e is incident. The light incident surface 6g is a plane orthogonal to the vertical direction.

  Screw holes 6c into which male screws formed at the tips of the shaft portions of the screws 14 are screwed are formed at the four corners of the lower surface of the protruding portion 6b formed in a square frame shape. The screw hole 6c is formed so as to be recessed upward from the lower surface of the protruding portion 6b. As will be described later, the left-right pitch of the two screws 14 arranged on the front side is different from the left-right pitch of the two screws 14 arranged on the rear side. The pitch of the two screw holes 6c formed on the front end side is different from the pitch of the two screw holes 6c formed on the rear end side of the lower surface of the protrusion 6b. In addition, the 2nd protrusion part 6d which protrudes further toward the lower side is formed in the outer peripheral end of the protrusion part 6b. 6 d of 2nd protrusion parts are formed along the outer peripheral surface of the diffusion plate 6, and are formed in square frame shape.

(Composition of housing part)
FIG. 5 is a perspective view of the housing 8 and the like shown in FIG. FIG. 6 is a plan view for explaining a state in which the board set 12 is attached to the housing portion 8a of the housing 8 shown in FIG.

  As described above, the storage portion 8a is formed in a flat rectangular parallelepiped box shape with a small thickness in the vertical direction, and the upper surface of the storage portion 8a is open. Moreover, the accommodating part 8a is comprised from the bottom face part 8c and the side wall part 8d. The side wall portion 8d is a flat plate-like side surface portion 8e constituting the rear side surface of the accommodating portion 8a, a flat plate-like side surface portion 8f constituting the front side surface of the accommodating portion 8a, and a flat plate shape constituting the right side surface of the accommodating portion 8a. The side surface portion 8g and the flat side surface portion 8h constituting the left side surface of the accommodating portion 8a. That is, the accommodating part 8a is provided with the side parts 8e-8h formed so that it may stand up from the bottom face part 8c. A protruding portion 8j that protrudes further upward is formed at the inner peripheral end of the upper end surface of the side wall portion 8d. The protruding portion 8j is formed along the inner peripheral surface of the side wall portion 8d, and is formed in a square frame shape.

  A plurality of ribs 8p to 8v protruding upward from the upper surface of the bottom surface portion 8c are formed in the housing portion 8a. The ribs 8p are formed at two locations, that is, a corner portion at the right rear end and a corner portion at the left rear end of the bottom surface portion 8c. The shape of the rib 8p when viewed from the vertical direction is a rectangular shape. The rear end of the rib 8p disposed at the corner at the right rear end of the bottom surface portion 8c is connected to the side surface portion 8e, and the right end of the rib 8p is connected to the side surface portion 8g. The left side surface of the rib 8p is a plane orthogonal to the left-right direction. The rear end of the rib 8p disposed at the corner of the left rear end of the bottom surface portion 8c is connected to the side surface portion 8e, and the left end of the rib 8p is connected to the side surface portion 8h. The right side surface of the rib 8p is a plane orthogonal to the left-right direction.

  The ribs 8q are formed at two locations on the rear end side of the bottom surface portion 8c. One rib 8q of the two ribs 8q is formed in a straight line extending leftward from the front end of the rib 8p disposed at the right rear end corner of the bottom surface portion 8c, and the other rib 8q is formed on the bottom surface portion. It is formed in a straight line extending rightward from the front end of the rib 8p disposed at the corner of the left rear end of 8c. The side surface (side surface in the front-rear direction) of the rib 8q is a plane orthogonal to the front-rear direction. The two ribs 8q are arranged at the same position in the front-rear direction. A gap is formed between the two ribs 8q in the left-right direction (that is, between the left end of the rib 8q arranged on the right side and the right end of the rib 8q arranged on the left side).

  The ribs 8r are formed at two locations on the front side of each of the two ribs 8q. One rib 8r of the two ribs 8r is formed in a linear shape extending from the side surface portion 8g to the left side, and the other rib 8r is formed in a linear shape extending from the side surface portion 8h to the right side. That is, the rib 8r is formed in parallel with the rib 8q. The side surface (side surface in the front-rear direction) of the rib 8r is a plane orthogonal to the front-rear direction. The two ribs 8r are arranged at the same position in the front-rear direction. A gap is formed between the two ribs 8r in the left-right direction (that is, between the left end of the rib 8r arranged on the right side and the right end of the rib 8r arranged on the left side). A gap is formed between the rib 8q and the rib 8r.

  The ribs 8s are formed at two locations on both end sides of the bottom surface portion 8c in the left-right direction. One of the two ribs 8s is formed in a straight line extending from the right side of the rib 8r arranged on the right side to the front side, and the other rib 8s is located on the left side of the rib 8r arranged on the left side. It is formed in a straight line extending from the front side to the front side. The side surface (side surface in the left-right direction) of the rib 8s is a plane orthogonal to the left-right direction. A gap is formed between the rib 8s arranged on the right side and the side part 8g, and a gap is formed between the rib 8s arranged on the left side and the side part 8h.

  The ribs 8u are formed at two locations, that is, a corner portion at the right front end and a corner portion at the left front end of the bottom surface portion 8c (see FIG. 6). The shape of the rib 8u when viewed from the vertical direction is a rectangular shape. The front end of the rib 8u disposed at the corner of the right front end of the bottom surface portion 8c is connected to the side surface portion 8f, and the right end of the rib 8u is connected to the side surface portion 8g. The front end of the rib 8u disposed at the left front corner of the bottom surface portion 8c is connected to the side surface portion 8f, and the left end of the rib 8u is connected to the side surface portion 8h.

  The rib 8v connects the rear ends of the two ribs 8u and is formed in a straight line parallel to the left-right direction. A gap is formed between the rib 8v and the side surface portion 8f. The rib 8t is formed on the rear side of the rib 8v. The rib 8t connects the front ends of the two ribs 8s and is formed in a straight line parallel to the left-right direction. A gap is formed between the rib 8t and the rib 8v. The side surfaces (side surfaces in the front-rear direction) of the ribs 8t, 8v are flat surfaces orthogonal to the front-rear direction.

  The upper surfaces of the ribs 8p to 8v are flat surfaces that are orthogonal to the vertical direction. The upper surface of the rib 8p, the upper surface of the rib 8q, the upper surface of the rib 8r, the upper surface of the rib 8s, the upper surface of the rib 8t, the upper surface of the rib 8u, and the upper surface of the rib 8v are arranged at the same position in the vertical direction. That is, the heights of the upper surfaces of the ribs 8p to 8v are the same. In addition, the height from the upper surface of the bottom face part 8c of the ribs 8p to 8v is lower than the height from the upper face of the bottom face part 8c at the upper end of the protruding part 8j.

  At four corners of the bottom surface portion 8c, through holes 8k through which the shaft portions of the screws 14 are inserted are formed. The through hole 8k passes through the bottom surface portion 8c in the vertical direction. The left and right through holes 8k formed on the front side pass through the rib 8u, and the left and right through holes 8k formed on the rear side pass through the rib 8p. In this embodiment, the left-right pitch of the two screws 14 arranged on the front side is different from the left-right pitch of the two screws 14 arranged on the rear side. Specifically, the pitch of the two screws 14 arranged on the front side is narrower than the pitch of the two screws 14 arranged on the rear side. Therefore, as shown in FIG. 6, the pitch P1 of the two through holes 8k formed on the front end side of the bottom surface portion 8c is the pitch P2 of the two through holes 8k formed on the rear end side of the bottom surface portion 8c. It is narrower than.

(Configuration of board assembly)
FIG. 7 is a perspective view showing the board set 12 shown in FIG. 2 from the opposite side.

  As described above, the LED drive substrate 5 is formed in a rectangular flat plate shape. The LED driving substrate 5 is accommodated in the accommodating portion 8a so that the thickness direction of the LED driving substrate 5 coincides with the vertical direction. Moreover, the LED drive board 5 is accommodated in the accommodating part 8a so that the longitudinal direction and the front-back direction of the LED drive board 5 formed in a rectangular flat plate shape coincide. The LED drive substrate 5 is disposed below the light guide plate 2.

  The board | substrate 4 is a flexible printed circuit board as mentioned above, and is comprised from the LED mounting board | substrate 4a and the connection board | substrate 4b. The LED mounting substrate 4a is formed in a substantially rectangular flat plate elongated in the left-right direction. The LED mounting substrate 4a is accommodated in the accommodating portion 8a so that the thickness direction of the LED mounting substrate 4a matches the front-rear direction. In addition, the LED mounting substrate 4 a is disposed on the rear side of the light guide plate 2.

  The plurality of LEDs 3 are mounted on one surface of the LED mounting substrate 4a. Specifically, the plurality of LEDs 3 are mounted on the front surface of the LED mounting substrate 4 a and are disposed so as to face the end surface 2 a of the light guide plate 2. The plurality of LEDs 3 are mounted on the LED mounting substrate 4a at a constant pitch in the left-right direction. That is, a plurality of LEDs 3 arranged in a straight line in the left-right direction are mounted on the LED mounting board 4a. In this embodiment, six LEDs 3 are mounted on the LED mounting board 4a.

  The plurality of LEDs 3 are mounted on the upper end portion of the LED mounting board 4a. The width in the left-right direction of the upper end portion of the LED mounting substrate 4a is wider than the width in the left-right direction of the lower end portion of the LED mounting substrate 4a. Both left and right end portions of the upper end portion of the LED mounting substrate 4a are protruding portions 4c that protrude outward in the left-right direction. At the center in the left-right direction of the lower end portion of the LED mounting substrate 4a, a notch 4d that is notched upward is formed (see FIG. 2).

  The connection board 4b extends from the LED mounting board 4a toward the front side, and includes a strip-like connection part 4e that connects the LED mounting board 4a and the LED driving board 5, and an extension part 4f that extends from the connection part 4e in the left-right direction. I have. The connection substrate 4b of this embodiment includes two extending portions 4f extending from the connecting portion 4e to both sides in the left-right direction. The two extending parts 4f extend outward in the left-right direction from the same position of the connecting part 4e in the front-rear direction. Further, both end surfaces in the front-rear direction of the extending portion 4f are orthogonal to the front-rear direction, and the connection substrate 4b is formed in a cross shape.

  The connection board 4b is pulled out from the lower end side of the LED mounting board 4a and connected to the lower surface of the LED drive board 5. That is, one end of the connection portion 4 e is connected to the lower end side of the LED mounting substrate 4 a, and the other end of the connection portion 4 e is connected to the lower surface of the LED drive substrate 5. Specifically, one end of the connection portion 4e is connected to the lower end surface of the central portion in the left-right direction of the LED mounting substrate 4a where the notch portion 4d is formed, and the other end of the connection portion 4e is the lower surface of the LED drive substrate 5 It is connected to the lower surface of the right end side and the rear end side.

  As shown in FIG. 6, the connection portion 4e forms a rear end side connection portion 4g that forms a portion between the LED mounting substrate 4a and the extension portion 4f of the connection portion 4e, and a front end side portion of the connection portion 4e. A front end side connection portion 4h and an intermediate connection portion 4j forming a portion between the extension portion 4f and the front end side connection portion 4h are provided. The width (horizontal width) H1 of the rear end side connection portion 4g is narrower than the width (horizontal width) H2 of the intermediate connection portion 4j. Further, the width H1 of the rear end side connection portion 4g is equal to the width (width in the left-right direction) of the front end side connection portion 4h.

  In this embodiment, the board 4 is a flexible printed board, and the LED mounting board 4a and the connection board 4b are integrally formed. However, the LED mounting board 4a and the connection board 4b formed separately are connected to each other. May be. In this case, the LED mounting substrate 4a may be an aluminum substrate, for example.

(Configuration of light guide plate and reflector)
FIG. 8 is a plan view for explaining the configuration of the light guide plate 2 shown in FIG. 9A is an enlarged view of a portion E in FIG. 8, FIG. 9B is an enlarged view of a portion F in FIG. 8, and FIG. 9C is an enlarged view of a portion G in FIG. FIG. 9D is an enlarged view of a portion H in FIG. FIG. 10A is an enlarged view of a portion J in FIG. 3, and FIG. 10B is an enlarged view of a portion K in FIG. 11A is a cross-sectional view for explaining the configuration of the right end portion of the lighting device 1 shown in FIG. 1, and FIG. 11B shows the configuration of the left end portion of the lighting device 1 shown in FIG. It is sectional drawing for doing.

  As described above, the light guide plate 2 is formed in a square flat plate shape, and is accommodated in the accommodating portion 8a so that the thickness direction of the light guide plate 2 coincides with the vertical direction. Further, as described above, the LED mounting substrate 4 a is disposed on the rear side of the light guide plate 2. On the end surface 2a constituting the rear end surface of the light guide plate 2, a plurality of convex portions 2f and 2g that protrude from the end surface 2a toward the LED mounting substrate 4a and come into contact with the LED mounting substrate 4a are formed. That is, the end surface 2a is formed with a plurality of convex portions 2f and 2g that protrude rearward from the end surface 2a and come into contact with the front surface of the LED mounting substrate 4a.

  The convex part 2f is formed in the center of the end surface 2a in the left-right direction. The convex part 2g is formed in two places of the both ends of the end surface 2a in the left-right direction. The shape of the convex portions 2f and 2g when viewed from the up and down direction is a rectangular shape. The rear end surfaces (tip surfaces) of the convex portions 2f and 2g are flat surfaces orthogonal to the front-rear direction. The convex portions 2f and 2g (specifically, the rear end surfaces of the convex portions 2f and 2g) are in contact with the upper end side portion of the LED mounting substrate 4a. The convex portion 2f is a central portion of the LED mounting board 4a in the left-right direction, and is in contact with the LED mounting board 4a between the LEDs 3 adjacent in the left-right direction. Each of the two convex portions 2g is in contact with each of both end portions in the left-right direction of the LED mounting substrate 4a. Specifically, each of the two protrusions 2g is in contact with each of the two protrusions 4c.

  In each of the four corners (four corners) of the light guide plate 2, notches 2 h and 2 j for preventing contact between the shaft portion of the screw 14 and the light guide plate 2 are formed. The notch 2 h is formed at two locations, a corner at the right rear end of the light guide plate 2 and a corner at the left rear end of the light guide plate 2. The notch 2j is formed in two places, a corner on the right front end of the light guide plate 2 and a corner on the left front end of the light guide plate 2. The notches 2h and 2j are formed so as to cut out at least the corners of the light guide plate 2. The notches 2h and 2j in this embodiment are recessed toward the center of the light guide plate 2.

  As shown in FIG. 9 (A), the side surface of the notch 2h formed at the corner of the left rear end of the light guide plate 2 is a concave curved surface having a 1/4 arc shape when viewed from the vertical direction. The curved surface portion 2p, the planar surface portion 2q connected to one end portion of the curved surface portion 2p and orthogonal to the end surface 2d, and the other end portion of the curved surface portion 2p and orthogonal to the rear end surface of the convex portion 2g. It is comprised from the planar planar part 2r connected so. Similarly, the side surface of the notch portion 2h formed at the right rear end corner of the light guide plate 2 is connected to the curved surface portion 2p and one end portion of the curved surface portion 2p and is connected to the end surface 2c so as to be orthogonal to the end surface 2c. And a flat surface portion 2r connected to the other end portion of the curved surface portion 2p and connected to be orthogonal to the rear end surface of the convex portion 2g (see FIG. 9B).

  Further, as shown in FIG. 9C, the side surface of the notch 2j formed at the corner of the left front end of the light guide plate 2 is a concave curved surface having a 1/4 arc shape when viewed from the vertical direction. The curved surface portion 2s, the planar surface portion 2t connected to one end portion of the curved surface portion 2s and orthogonal to the end surface 2d, and connected to the other end portion of the curved surface portion 2s and orthogonal to the end surface 2b. It is comprised from the planar planar part 2u. Similarly, the side surface of the notch 2j formed at the corner of the right front end of the light guide plate 2 is connected to the curved surface 2s and one end of the curved surface 2s, and to the flat surface 2t that is connected so as to be orthogonal to the end surface 2c. The flat surface portion 2u is connected to the other end portion of the curved surface portion 2s and is connected to be orthogonal to the end surface 2b (see FIG. 9D).

  That is, part of the side surfaces of the notches 2h and 2j are formed in a concave curved surface shape. In this embodiment, the curvature radius of the curved surface portion 2p is equal to the curvature radius of the curved surface portion 2s. In addition, the width of the plane portion 2q in the left-right direction is narrower than the width of the plane portion 2t in the left-right direction. The width of the plane part 2r in the front-rear direction is substantially equal to the width of the plane part 2u in the front-rear direction. The flat surface portion 2r formed at the corner at the left rear end of the light guide plate 2 constitutes the left side surface of the convex portion 2g disposed on the left side. The flat surface portion 2r formed at the corner at the right rear end of the light guide plate 2 constitutes the right side surface of the convex portion 2g disposed on the right side.

  As described above, the reflection plate 7 includes the reflection portions 7a to 7d. The reflection part 7a is formed in a rectangular flat plate shape, and is arranged so that the thickness direction of the reflection part 7a coincides with the vertical direction. Moreover, the reflection part 7a is arrange | positioned so that the lower surface of the light-guide plate 2 may be faced. The outer peripheral surface of the reflection part 7a is parallel to the front-rear direction or the left-right direction. The reflection part 7b is formed in a rectangular plate shape elongated in the left-right direction, and is connected to the front end face of the reflection part 7a. Moreover, the reflection part 7b is formed so that it may stand up from the front end surface of the reflection part 7a. The reflection part 7 b is disposed so as to face the end surface 2 b of the light guide plate 2.

  The reflecting portions 7c and 7d are formed in a rectangular flat plate elongated in the front-rear direction. The reflection part 7c is connected to the right end surface of the reflection part 7a. Moreover, the reflection part 7c is formed so that it may stand up from the right end surface of the reflection part 7a. The reflecting portion 7 c is disposed so as to face the end surface 2 c of the light guide plate 2. The reflecting portion 7d is connected to the left end surface of the reflecting portion 7a. The reflecting portion 7d is formed so as to rise upward from the left end surface of the reflecting portion 7a. The reflecting portion 7d is disposed so as to face the end surface 2d of the light guide plate 2.

  The rear end surface 7e of the reflection portion 7a protrudes rearward from the rear end surfaces of the reflection portions 7c and 7d. The rear end surface 7e is in contact with the lower end side portion of the LED mounting substrate 4a. Specifically, the rear end surface 7e is in contact with the front surface of the lower end portion of the LED mounting substrate 4a. At each of the four corners of the reflection plate 7, notches for preventing the shaft portion of the screw 14 from contacting the reflection plate 7 are formed.

  Moreover, the reflecting plate 7 is an integral object. A plurality of slits (cuts) 7f are formed at a predetermined interval in a connecting portion between the reflecting portion 7a and the reflecting portion 7b. Similarly, a plurality of slits 7f are formed at predetermined intervals in the connecting portion between the reflecting portion 7a and the reflecting portion 7c and also in the connecting portion between the reflecting portion 7a and the reflecting portion 7d. In this embodiment, since a plurality of slits 7f are formed in the reflecting plate 7, it is possible to easily perform the process of raising the reflecting portions 7b, 7c, 7d upward from the reflecting portion 7a. Since the reflecting portions 7b, 7c, and 7d are raised upward from the reflecting portion 7a, the connecting portion between the reflecting portion 7a and the reflecting portions 7b, 7c, and 7d is on the upper side (that is, the light emitting surface 6a). It tends to be a concave curved surface with the concave surface facing the side. Therefore, the light emitted from the light guide plate 2 toward the concave curved surface is likely to be reflected as the light collected on the concave curved surface, and this reflected light tends to generate high luminance spots on the light emitting surface 6a. However, in this embodiment, since the slit 7f is formed, it is possible to reduce the amount of reflected light at the connecting portion between the reflecting portion 7a and the reflecting portions 7b, 7c, and 7d. It is possible to suppress the occurrence of luminance spots on the surface 6a.

(Specific configuration of lighting device)
As described above, the light guide plate 2, the LED 3, the reflection plate 7, and the substrate set 12 are accommodated in the accommodating portion 8a. Further, the diffusion plate 6 is fixed to the upper end of the side wall portion 8d of the housing portion 8a so as to close the opening of the housing portion 8a.

  The LED mounting substrate 4a is disposed between the light guide plate 2 and the reflection plate 7 and the side surface portion 8e of the housing portion 8a. That is, the LED mounting substrate 4a is sandwiched between the convex portions 2f and 2g of the light guide plate 2 and the side surface portion 8e. The LED mounting substrate 4a is sandwiched between the rear end surface 7e and the side surface portion 8e of the reflecting portion 7a. As described above, the convex portions 2f and 2g are in contact with the upper end portion of the LED mounting board 4a, and the rear end surface 7e is in contact with the lower end portion of the LED mounting board 4a.

  As shown in FIG. 10A, the lower end surface of the LED mounting substrate 4a is in contact with the bottom surface portion 8c of the housing portion 8a. Specifically, the lower end surface of the LED mounting substrate 4a is in contact with the upper surface of the bottom surface portion 8c. The anti-mounting surface 4k (see FIG. 7, FIG. 10 (A), etc.) that is the surface opposite to the surface on which the LED 3 is mounted (that is, the rear surface of the LED mounting substrate 4a) of the LED mounting substrate 4a is a side surface portion. It faces 8e.

  The front-rear direction (X direction) of the present embodiment is a first direction that is opposite to the anti-mounting surface 4k and the side surface portion 8e. This first direction (front-rear direction) is a direction perpendicular to the up-down direction, which is the flat direction of the accommodating portion 8a, and is also a direction along one side of the light guide plate 2 formed in a square shape. Moreover, the left-right direction (Y direction) is a second direction that is a direction orthogonal to the up-down direction, which is the flat direction of the housing portion 8a, and the front-back direction, which is the first direction.

  Moreover, the end surface 2a of the light guide plate 2 of the present embodiment is a first end surface disposed so that the LED 3 faces, and is one end surface of the light guide plate 2 in the first direction (front-rear direction). The end surface 2 b of the light guide plate 2 is a second end surface that is the other end surface of the light guide plate 2 in the first direction (front-rear direction). The end surfaces 2c and 2d of the light guide plate 2 are third end surfaces that are end surfaces of the light guide plate 2 excluding the end surface 2a that is the first end surface and the end surface 2b that is the second end surface.

  An elastic member 16 is disposed between the LED mounting substrate 4a and the side surface portion 8e. The elastic member 16 is a heat radiating tape having heat radiating properties, and is formed in a rectangular shape elongated in the left-right direction. The front surface of the elastic member 16 is in contact with the anti-mounting surface 4k, and the rear surface of the elastic member 16 is in contact with the side surface portion 8e. The length (length in the left-right direction) of the elastic member 16 is substantially equal to the width in the left-right direction of the lower end side portion of the LED mounting board 4a (see FIG. 7). The width (vertical width) of the elastic member 16 is slightly narrower than the vertical width of the LED mounting substrate 4a.

  The elastic member 16, which is a heat dissipation tape, functions to fix the LED mounting substrate 4a to the side surface portion 8e. However, the adhesive force of the elastic member 16 is relatively low, and the adhesive force is such that the LED mounting substrate 4a moves slightly when an external force acts on the connection substrate 4b. Moreover, the elastic member 16 which is a heat dissipation tape also fulfills the function of releasing the heat generated by the LED 3 to the side surface portion 8e.

  The right end surface 4p of the lower end side portion of the LED mounting substrate 4a contacts the left side surface of the rib 8p disposed on the right side, and the left end surface 4q of the lower end side portion of the LED mounting substrate 4a corresponds to the rib 8p disposed on the left side. It is in contact with the right side. The protrusion 4c disposed on the right side of the LED mounting substrate 4a is disposed above the rib 8p disposed on the right side, and the protrusion 4c disposed on the left side of the LED mounting substrate 4a is disposed on the left side. It arrange | positions above the rib 8p.

  In this embodiment, a first positioning portion 18 (see FIG. 6) for positioning the board set 12 in the left-right direction is configured by the right end face 4p and the left end face 4q of the LED mounting board 4a and the rib 8p. That is, the LED mounting board 4a and the housing portion 8a (specifically, the left and right end faces 4p and 4q of the LED mounting board 4a constituting a part of the LED mounting board 4a and a rib constituting a part of the housing part 8a) 8p) constitutes the first positioning part 18. The rib 8p of this embodiment is a first protrusion that protrudes upward from the bottom surface portion 8c and contacts the left and right end surfaces 4p and 4q of the LED mounting substrate 4a.

  As shown in FIG. 6, the LED drive substrate 5 is disposed in a region surrounded by the two ribs 8r, the two ribs 8s, and the ribs 8t. The rear end surface of the LED drive substrate 5 is disposed on the front side of the rib 8r, and the front end surface of the LED drive substrate 5 is disposed on the rear side of the rib 8t. Further, the LED drive substrate 5 is in contact with the upper surface of the bottom surface portion 8c.

  The portion of the upper surface of the bottom surface portion 8c where the connection substrate 4b is disposed is disposed below the portion of the upper surface of the bottom surface portion 8c where the LED driving substrate 5 contacts. Specifically, the portion of the upper surface of the bottom surface portion 8c where the connection substrate 4b is disposed is lower by the thickness of the connection substrate 4b than the portion of the upper surface of the bottom surface portion 8c where the LED driving substrate 5 contacts. Has been placed. Further, the portion of the upper surface of the bottom surface portion 8c where the lower end surface of the LED mounting substrate 4a contacts is disposed on the same plane as the portion of the upper surface of the bottom surface portion 8c where the connection substrate 4b is disposed.

  As described above, the connection substrate 4b is pulled out from the lower end side of the LED mounting substrate 4a, connected to the lower surface of the LED drive substrate 5, and is routed along the bottom surface portion 8c. A front end side portion of the rear end side connection portion 4g of the connection substrate 4b is disposed in a gap between the two ribs 8q. The rear end portion of the intermediate connection portion 4j of the connection board 4b is disposed in the gap between the two ribs 8r. The extension 4f of the connection substrate 4b is disposed in the gap between the rib 8q and the rib 8r. The rear end surface of the extended portion 4f is in contact with the front side surface of the rib 8q, and the front end surface of the extended portion 4f is in contact with the rear side surface of the rib 8r.

  In the present embodiment, the second positioning portion 19 (see FIGS. 6 and 10A) that positions the board set 12 in the front-rear direction by both end faces in the front-rear direction of the extending portion 4f of the connection substrate 4b and the ribs 8q, 8r. ) Is configured. That is, by the connection substrate 4b and the accommodating portion 8a (specifically, both end surfaces in the front-rear direction of the extending portion 4f constituting a part of the connection substrate 4b, and ribs 8q and 8r constituting a portion of the accommodation portion 8a, The second positioning part 19 is configured. The ribs 8q and 8r of the present embodiment are second protrusions that protrude upward from the bottom surface 8c and that are in contact with both front and rear end surfaces of the extension 8f.

  The width H1 of the rear end side connection portion 4g is wider than the distance D1 in the left-right direction of the two ribs 8q. Specifically, the width H1 is slightly wider than the distance D1. That is, the distance D1 is shorter than the width H1, and both end surfaces in the left-right direction of the rear end side connecting portion 4g are in contact with the respective end surfaces of the two ribs 8q with a predetermined contact pressure. . That is, the rear end side connection portion 4g is fitted in the gap between the two ribs 8q.

  In the present embodiment, the connection substrate 4b is moved upward by the both end surfaces in the left-right direction of the connection portion 4e (specifically, both end surfaces in the left-right direction of the rear-end side connection portion 4g) and the two ribs 8q. A restriction unit 20 (see FIG. 6) for restriction is configured. The rib 8q of the present embodiment is a third protrusion that protrudes upward from the bottom surface portion 8c and contacts both end surfaces in the left-right direction of the connection portion 4e. Note that the width H2 of the intermediate connection portion 4j is narrower than the distance D2 in the left-right direction of the two ribs 8r. Specifically, the width H2 is slightly narrower than the distance D2.

  The length of the rear end side connection portion 4g in the front-rear direction is longer than the distance in the front-rear direction between the front side surface of the rib 8q and the LED mounting substrate 4a. That is, the length of the connection portion 4e between the LED mounting board 4a and the LED driving board 5 in the front-rear direction is longer than the distance between the LED mounting board 4a and the LED driving board 5 in the front-back direction. .

  The reflecting portion 7a of the reflecting plate 7 is in contact with the upper surfaces of the ribs 8p to 8v. The reflection portion 7b is sandwiched between the end surface 2b of the light guide plate 2 and the side surface portion 8f of the housing portion 8a, and is in contact with the end surface 2b and the side surface portion 8f. The reflecting portion 7c is sandwiched between the end surface 2c of the light guide plate 2 and the side surface portion 8g of the accommodating portion 8a, and is in contact with the end surface 2c and the side surface portion 8g. The reflection portion 7d is sandwiched between the end surface 2d of the light guide plate 2 and the side surface portion 8h of the housing portion 8a, and is in contact with the end surface 2d and the side surface portion 8h.

  The reflecting portions 7b to 7d are in contact with the side wall portion 8d with a predetermined contact pressure. That is, the reflecting portion 7b contacts the side surface portion 8f with a predetermined contact pressure, the reflecting portion 7c contacts the side surface portion 8g with a predetermined contact pressure, and the reflecting portion 7d contacts the side surface portion 8h with a predetermined contact pressure. In contact. Specifically, the reflecting portion 7b is applied to the side surface portion 8f with a predetermined contact pressure so that the reflecting plate 7 does not move with respect to the accommodating portion 8a in the vertical direction, the front-rear direction, and the left-right direction due to its own weight. The reflecting portion 7c is in contact with the side surface portion 8g with a predetermined contact pressure, and the reflecting portion 7d is in contact with the side surface portion 8h with a predetermined contact pressure.

  That is, the reflecting plate 7 is fitted in the housing portion 8a so as not to move with respect to the housing portion 8a in the vertical direction, the front-rear direction, and the left-right direction due to its own weight. Further, since the reflecting portion 7b is in contact with the side surface portion 8f with a predetermined contact pressure, the rear end surface 7e of the reflecting portion 7a is in contact with the LED mounting substrate 4a with a predetermined contact pressure. The side surface portion 8f of this embodiment is a second side surface portion where the surface opposite to the reflection surface of the reflection portion 7b faces.

  The reflecting portion 7b of the reflecting plate 7 before being accommodated in the accommodating portion 8a is the reflecting portion 7b in a state where the reflecting plate 7 is accommodated in the accommodating portion 8a, as indicated by a two-dot chain line in FIG. Rather than the outer peripheral side (front side) of the reflector 7. When the reflecting plate 7 is accommodated in the accommodating portion 8a, the reflecting portion 7b rises toward the center side of the reflecting plate 7 and contacts the side surface portion 8f with a predetermined contact pressure. Similarly, the reflecting portions 7c and 7d of the reflecting plate 7 before being accommodated in the accommodating portion 8a are closer to the outer peripheral side of the reflecting plate 7 than the reflecting portions 7c and 7d in a state where the reflecting plate 7 is accommodated in the accommodating portion 8a. When the reflecting plate 7 is collapsed and is accommodated in the accommodating portion 8a, the reflecting portions 7c and 7d rise toward the center of the reflecting plate 7 and come into contact with the side surface portions 8g and 8h with a predetermined contact pressure.

  The diffusing plate 6 is fixed to the housing 8 with the four screws 14 as described above. Specifically, the diffusion plate 6 is fixed to the housing portion 8a. Further, as described above, the four screws 14 are arranged at the four corners of the diffusion plate 6, and the accommodating portion 8 a and the diffusion plate 6 are fixed to each other by the screws 14 at the four corners of the diffusion plate 4. Has been. Further, when viewed from above and below, each of the four corners of the diffusing plate 6 and each of the four corners of the light guide plate 2 overlap each other, and each of the four screws 14 is guided. It is arranged at each of the four corners (four corners) of the optical plate 2.

  A part of the screw 14 is disposed in the notches 2h and 2j of the light guide plate 2. A part of the screw 14 is arranged in a notch formed at the four corners of the reflection plate 7. In a state where the diffusing plate 6 is fixed to the accommodating portion 8 a, the second projecting portion 6 d of the diffusing plate 6 is disposed on the outer peripheral side of the projecting portion 8 j of the housing 8. The lower surface of the second protruding portion 6d is in contact with the upper end surface of the side wall portion 8d.

  In the light guide plate 2, the convex portions 2f and 2g are in contact with the LED mounting substrate 4a, the end surface 2b is in contact with the reflecting portion 7b, the end surface 2c is in contact with the reflecting portion 7c, and the end surface 2d is in contact with the reflecting portion 7d. And accommodated in the accommodating portion 8a. The light guide plate 2 is housed in the housing portion 8a with the lower surface of the light guide plate 2 in contact with the reflecting portion 7a. Further, as described above, the light emitting surface 2e of the light guide plate 2 has an outer portion in the front-rear direction and an outer portion in the left-right direction (that is, the peripheral portion of the light emitting surface 2e) of the protrusion 6b of the diffusion plate 6. The bottom surface is in contact. The light guide plate 2 is fixed inside the accommodating portion 8a by the protruding portion 6b coming into contact with the light emitting surface 2e. Specifically, the light guide plate 2 is configured such that the lower surface of the light guide plate 2 is in contact with the reflecting portion 7a, and the protruding portion 6b is in contact with the light emitting surface 2e, so that the reflecting portion 7a and the protruding portion 6b are interposed. It is fixed inside the accommodating portion 8a in a sandwiched state.

  In the state where the light guide plate 2 is housed in the housing portion 8a, it is preferable that the light emitting surface 2e of the light guide plate 2 projects slightly above the upper end of the projecting portion 8j of the housing 8. In this case, the light guide plate 2 can be securely sandwiched between the reflecting portion 7a and the protruding portion 6b.

  When the lighting device 1 is assembled, first, the substrate set 12 is accommodated in the accommodating portion 8a, and then the reflecting plate 7 is fitted into the accommodating portion 8a. Thereafter, the light guide plate 2 is accommodated in the accommodating portion 8a. When the light guide plate 2 is accommodated, the LED mounting substrate 4a is firmly positioned. Thereafter, the diffusion plate 6 is fixed to the accommodating portion 8a with the screws 14.

(Light path in the lighting device)
Part of the light emitted from the LED 3 enters the light guide plate 2 from the end surface 2 a of the light guide plate 2, and then is totally reflected by the light exit surface 2 e of the light guide plate 2 and the reflection plate 7. And proceed while being scattered by the light scattering particles, and either of them is emitted from the light exit surface 2e. Further, another part of the light emitted from the LED 3 proceeds while being scattered by the light scattering particles without being totally reflected by the light emitting surface 2e, and is emitted from the light emitting surface 2e. Since the light in the light guide plate 2 is totally reflected by the light exit surface 2e and the reflection plate 7 and scattered by the light scattering particles, the brightness of the light exit surface 2e is made uniform.

  A part of the light emitted from the light emission surface 2e of the light guide plate 2 is incident on a portion of the lower surface of the protruding portion 6b that contacts the light emission surface 2e. This light travels while being totally reflected by the inner peripheral surface of the protrusion 6b and the outer peripheral surface of the diffusion plate 6, and travels while being scattered by the light scattering particles, and is an area mainly corresponding to the protrusion 6b of the light exit surface 6a. In other words, the light exits from the peripheral edge of the light exit surface 6a. Further, the light emitted from the light emitting surface 2e and incident on the light incident surface 6g travels while being scattered by the light scattering particles, and is emitted from the light emitting surface 6a.

(Main effects of this form)
As described above, the lighting device 1 of this embodiment includes the LED 3, the LED mounting board 4a on which the LED 3 is mounted, the LED driving board 5 on which the driving circuit for the LED 3 is mounted, the LED mounting board 4a, and the LED driving board. 5 and a housing 8 having an accommodating portion 8a formed in a flat box shape. The LED 3 is mounted on the front surface of the LED mounting board 4a. The connection substrate 4b is a flexible printed circuit board, and the upper surface of the accommodating portion 8a is open. In the housing portion 8a, the board set 12 and the LED 3 configured by the LED mounting board 4a, the LED driving board 5, and the connection board 4b are housed. The accommodating portion 8a is formed so as to rise upward from the bottom surface portion 8c constituting the lower surface and the bottom surface portion 8c, and the anti-mounting surface 4k that is the surface opposite to the surface on which the LED 3 is mounted of the LED mounting substrate 4a. Are provided with opposing side surface portions 8e.

  Further, the LED mounting substrate 4a and the accommodating portion 8a constitute a first positioning portion 18 that positions the substrate set 12 with respect to the accommodating portion 8a in the left-right direction. Specifically, the LED mounting substrate 4a is formed in a substantially rectangular shape elongated in the left-right direction, and the housing portion 8a in the left-right direction is formed by the left and right end faces 4p, 4q of the LED mounting substrate 4a and the housing portion 8a. A first positioning portion 18 for positioning the substrate set 12 is configured. More specifically, by the left and right end faces 4p, 4q of the LED mounting board 4a and the ribs 8p that protrude upward from the bottom surface portion 8c and that the both end faces 4p, 4q of the LED mounting board 4a come into contact with, A first positioning portion 18 is configured.

  Further, the connection substrate 4b and the accommodating portion 8a constitute a second positioning portion 19 that positions the substrate set 12 with respect to the accommodating portion 8a in the front-rear direction. Specifically, the connection board 4b extends from the LED mounting board 4a toward the front side, and extends in the left-right direction from the band-like connection part 4e that connects the LED mounting board 4a and the LED drive board 5 to each other. Ribs 8q and 8r, which are provided with a projecting portion 4f, projecting upward from the bottom surface portion 4c to the both end surfaces in the front-rear direction of the extension portion 4f and contacting both end surfaces in the front-rear direction of the extension portion 4f, Thus, the second positioning portion 19 is configured.

  Thus, in this embodiment, the LED mounting substrate 4a and the housing portion 8a constitute the first positioning portion 18 that positions the board set 12 with respect to the housing portion 8a in the left-right direction, and the connection substrate 4b and the housing portion 8a. Thus, a second positioning portion 19 that positions the substrate set 12 with respect to the accommodating portion 8a in the front-rear direction is configured. Therefore, in the present embodiment, the first positioning portion 18 can easily position the board set 12 with respect to the accommodating portion 8a in the left-right direction, and the second positioning portion 19 allows the accommodating portion 8a in the front-rear direction. Therefore, the substrate set 12 can be easily positioned with respect to the substrate set 12. Therefore, in this embodiment, the lighting device 1 can be easily assembled.

  Like this form, it is preferable that the connection board | substrate 4b is formed in the cross shape which has the two extension parts 4f extended to the both sides of the left-right direction from the connection part 4e. If it does in this way, it will become possible to position the board | substrate set 12 reliably with respect to the accommodating part 8a in the front-back direction using the two extension parts 4f and the ribs 8q and 8r.

  As in this embodiment, the LED drive substrate 5 is accommodated in the accommodating portion 8a so that the thickness direction of the LED drive substrate 5 coincides with the vertical direction, and the connection substrate 4b is pulled out from the lower end side of the LED mounting substrate 4a. It is preferable to be connected to the lower surface of the LED drive substrate 5. In this way, the connection substrate 4b can be routed along the bottom surface portion 8c. For example, when the connection substrate 4b is drawn from the upper end side of the LED mounting substrate 4a, or the upper surface of the LED drive substrate 5 As compared with the case where the connection substrate 4b is connected to the housing portion 8a, it is possible to stabilize the housing state of the substrate set 12 housed in the housing portion 8a. Therefore, it becomes possible to easily incorporate the board set 12 into the accommodating portion 8a.

  Like this form, it is preferable that the illuminating device 1 is provided with the control part 20 which controls the movement to the upper side of the connection board | substrate 4b routed along the bottom face part 8c. If it does in this way, since the movement to the upper side of the connection board | substrate 4b accommodated in the accommodating part 8a is prevented by the control part 20, it will become possible to incorporate the board | substrate set 12 with respect to the accommodating part 8a easily.

  Like this form, the connection board 4b is provided with the strip | belt-shaped connection part 4e which connects the LED mounting board | substrate 4a and the LED drive board 5 while extending toward the front side from the LED mounting board | substrate 4a, and the control part 20 is a connection part. 4e is composed of both end surfaces in the left-right direction of the rear end side connecting portion 4g and ribs 8q that protrude upward from the bottom surface portion 8c and contact with both end surfaces in the left and right direction of the rear end side connecting portion 4g. The horizontal distance D1 between the rib 8q that contacts the right end surface of the rear end side connecting portion 4g and the rib 8q that contacts the left end surface of the rear end side connecting portion 4g is equal to the horizontal direction of the rear end side connecting portion 4g. The width is preferably shorter than the width H1. If it does in this way, it will become possible to prevent the movement to the upper side of the connection board | substrate 4b with the comparatively simple structure using the rib 8q which protrudes from the bottom face part 8c.

  Like this form, the connection board 4b is provided with the strip | belt-shaped connection part 4e which extends toward the front side from the LED mounting board 4a, and connects the LED mounting board 4a and the LED drive board 5, and the front-back direction of the connection part 4e The length of the portion between the LED mounting board 4a and the LED driving board 5 is preferably longer than the distance between the LED mounting board 4a and the LED driving board 5 in the front-rear direction. If it does in this way, it will become possible to bend the connection part 4e of the connection board 4b which is a flexible printed circuit board, and the LED mounting board 4a will face the side part 8e using the restoring force of the bent connection part 4e. Can be pressed.

  Specifically, in this embodiment, the length of the rear end side connection portion 4g in the front-rear direction is longer than the distance in the front-rear direction between the front side surface of the rib 8q and the LED mounting substrate 4a. The connecting portion 4g can be bent, and the LED mounting board 4a can be pressed toward the side surface portion 8e by using the restoring force of the bent rear end side connecting portion 4g. Therefore, the accommodation state of the LED mounting substrate 4a accommodated in the accommodating portion 8a can be stabilized, and as a result, the board set 12 can be easily assembled into the accommodating portion 8a.

  Moreover, the illuminating device 1 of this form is formed in the flat box shape with the light guide plate 2, LED3 arrange | positioned so that the end surface 2a of the light guide plate 2 may be faced, LED mounting substrate 4a in which LED3 is mounted. And a housing 8 having a housing portion 8a. The LED 3 is mounted on the front surface of the LED mounting substrate 4a, and the upper surface of the housing portion 8a is open. In the housing portion 8a, the LED 3, the LED mounting substrate 4a, and the light guide plate 2 are housed. The accommodating portion 8a is formed so as to rise upward from the bottom surface portion 8c constituting the lower surface and the bottom surface portion 8c, and the anti-mounting surface 4k that is the surface opposite to the surface on which the LED 3 is mounted of the LED mounting substrate 4a. Are provided with opposing side surface portions 8e. The light guide plate 2 is formed with convex portions 2f and 2g that protrude from the end surface 2a where the LEDs 3 face to face the LED mounting substrate 4a and come into contact with the LED mounting substrate 4a. The LED mounting substrate 4a is formed with the convex portion 2f. 2g and the side surface portion 8e.

  Thus, in this embodiment, the convex portions 2f and 2g that protrude from the end surface 2a toward the LED mounting substrate 4a and come into contact with the LED mounting substrate 4a are formed on the light guide plate 2, and the LED mounting substrate 4a includes the convex portions 2f and 2g. And the side surface portion 8e. Therefore, in this embodiment, by accommodating the light guide plate 2 in the accommodating portion 8a, the LED mounting substrate 4a can be positioned using the convex portions 2f and 2g and the side surface portion 8e. Therefore, in this embodiment, the lighting device 1 can be easily assembled.

  As in the present embodiment, the LED mounting board 4a is formed in a substantially rectangular shape that is elongated in the left-right direction. A plurality of LEDs 3 arranged in the left-right direction are mounted on the LED mounting board 4a. The convex part 2g which contacts the both ends of the LED mounting board 4a in the direction, and the convex part which is the central part of the LED mounting board 4a in the left-right direction and contacts the LED mounting board 4a between the LEDs 3 adjacent in the left-right direction. The part 2f is preferably formed. In this way, the LED mounting substrate 4a can be prevented from wobbling in the entire region in the left-right direction, and the distance in the front-rear direction between the LED 3 mounted on the LED mounting substrate 4a and the end surface 2a of the light guide plate 2 can be kept constant. It becomes possible. Therefore, it is possible to suppress luminance unevenness of the lighting device 1.

  Like this form, the illuminating device 1 is provided with the reflecting plate 7 which has the reflecting part 7b which is arrange | positioned so that it may face the end surface 2b of the light-guide plate 2, and reflects the light inject | emitted from the end surface 2b, and the accommodating part 8a is a bottom face. A side surface portion 8f formed so as to rise upward from the portion 8c and facing the opposite surface of the reflecting surface of the reflecting portion 7b, and the reflecting portion 7b is sandwiched between the end surface 2b and the side surface portion 8f. Is preferred. In this way, by accommodating the light guide plate 2 in the accommodating portion 8a, the reflecting portion 7b of the reflecting plate 7 can be fixed using the end surface 2b and the side surface portion 8f. Therefore, it becomes possible to assemble the lighting device 1 more easily.

  Like this form, it is preferable that the illuminating device 1 is provided with the elastic member 16 arrange | positioned between the LED mounting substrate 4a and the side part 8e. In this way, the light guide plate 2 is accommodated in the accommodating portion 8a so that the elastic member 16 is compressed in the front-rear direction, whereby the LED mounting substrate 4a is interposed between the reflecting portion 7a and the side surface portion 8e of the reflecting plate 7. It becomes possible to maintain the sandwiched state. Further, even if the side surface portions 8e and 8f are deformed by the influence of external force or the light guide plate 2 contracts with time, the LED mounting substrate is provided between the convex portions 2f and 2g of the light guide plate 2 and the side surface portion 8e. It becomes possible to maintain the state where 4a is sandwiched.

  Like this form, the elastic member 16 is a heat dissipation tape which has heat dissipation, and is preferably disposed between the LED mounting substrate 4a and the side surface portion 8e. In this way, it is possible to increase the fixing strength of the LED mounting substrate 4a using the elastic member 16 that is a heat dissipation tape, and the heat generated by the LED 3 is efficiently generated using the elastic member 16 that is a heat dissipation tape. It becomes possible to dissipate.

  Like this form, it is preferable that the lower end surface of LED mounting substrate 4a is contacting the bottom face part 8c. If it does in this way, it will become possible to position LED mounting board 4a in the up-and-down direction using bottom face part 8c. Therefore, it is possible to simplify the configuration of the lighting device 1 as compared with a case where a member for positioning the LED mounting board 4a in the vertical direction is separately provided.

  Like this form, the illuminating device 1 is equipped with the diffusion plate 6 which is arrange | positioned above the light-guide plate 2, and diffuses the light which the light-guide plate 2 emits, and block | closes the opening of the accommodating part 8a. The protrusion 6b is formed along the outer peripheral surface of the light guide plate 2 and protrudes toward the light guide plate 2 and comes into contact with the light emission surface 2e. The light guide plate 2 has a housing portion formed by the protrusion 6b coming into contact with the light emission surface 2e. It is preferably fixed inside 8a. If it does in this way, it will become possible to raise the brightness | luminance of the peripheral part of the diffusion plate 6 by the effect | action of the protrusion part 6b, As a result, it will become possible to suppress the luminance unevenness of the illuminating device 1. FIG. Moreover, since it becomes possible to fix the light-guide plate 2 using the protrusion part 6b when doing in this way, compared with the case where the member for fixing the light-guide plate 2 is provided separately, an illuminating device. 1 can be simplified.

  Further, the lighting device 1 of the present embodiment includes a reflecting plate 7, a light guide plate 2, an LED 3 disposed so as to face the end surface 2a of the light guide plate 2, an LED mounting substrate 4a on which the LED 3 is mounted, and a flat box And a housing 8 having an accommodating portion 8a formed in a shape. The LED 3 is mounted on the front surface of the LED mounting substrate 4a, and the upper surface of the housing portion 8a is open. The accommodating portion 8a is formed so as to rise upward from the bottom surface portion 8c constituting the lower surface and the bottom surface portion 8c, and the anti-mounting surface 4k that is the surface opposite to the surface on which the LED 3 is mounted of the LED mounting substrate 4a. Are provided with opposing side surface portions 8e. The accommodating portion 8a accommodates the LED 3, the LED mounting substrate 4a, and the reflecting plate 7, and accommodates the light guide plate 2 so that the thickness direction of the light guide plate 2 matches the vertical direction. The reflection plate 7 includes a reflection portion 7 a that is disposed so as to face the lower surface of the light guide plate 2 and reflects light emitted from the lower surface of the light guide plate 2. The rear end surface 7e of the reflection portion 7a is in contact with the LED mounting substrate 4a, and the LED mounting substrate 4a is sandwiched between the rear end surface 7e and the side surface portion 8e of the reflection portion 7a.

  Thus, in this embodiment, the rear end surface 7e of the reflection portion 7a constituting a part of the reflection plate 7 is in contact with the LED mounting substrate 4a, and the LED mounting substrate 4a is connected to the rear end surface 7e of the reflection portion 7a. It is sandwiched between the side surface portion 8a. Therefore, in this embodiment, the LED mounting board 4a can be easily positioned in the front-rear direction. Therefore, in this embodiment, the lighting device 1 can be easily assembled.

  Like this form, it is preferable that the reflecting plate 7 is fitted in the accommodating part 8a so that it may not move with respect to the accommodating part 8a in the up-down direction, the front-back direction, and the left-right direction by the weight of the reflecting plate 7. If it does in this way, it will become possible to stabilize the accommodation state of the reflecting plate 7 accommodated in the accommodating part 8a. Therefore, it is possible to easily incorporate the reflecting plate 7 into the housing portion 8a.

  As in this embodiment, the reflecting plate 7 includes a reflecting portion 7b that is connected to the front end surface of the reflecting portion 7a and faces the end surface 2b of the light guide plate 2 and reflects light emitted from the end surface 2b. 8a includes a side surface portion 8f that is formed so as to rise upward from the bottom surface portion 8c, and that is opposite to the reflection surface of the reflection portion 7b. The reflection portion 7b is formed in the vertical direction and the front-back direction by the weight of the reflection plate 7. It is preferable that the side plate 8f is in contact with a predetermined contact pressure so that the reflecting plate 7 does not move in the left-right direction. In this way, the reflecting portion 7b and the side surface portion 8f can be brought into surface contact with a predetermined contact pressure, so that the accommodating state of the reflecting plate 7 accommodated in the accommodating portion 8a can be further stabilized. Become. Further, as described above, since the rear end surface 7e of the reflecting portion 7a contacts the LED mounting substrate 4a with a predetermined contact pressure as described above, the LED mounting substrate 4a can be reliably positioned in the front-rear direction. become.

  As in this embodiment, the reflecting plate 7 is connected to the right end surface of the reflecting portion 7a and is disposed so as to face the end surface 2c of the light guide plate 2. The reflecting portion 7c reflects light emitted from the end surface 2c, and the reflecting portion 7a. And a reflecting portion 7d that reflects the light emitted from the end surface 2d, and is formed so as to rise upward from the bottom surface portion 8c. And includes a cylindrical side wall portion 8d that constitutes an outer peripheral surface of the accommodating portion 8a and includes a side surface portion 8e in a part thereof, and the reflecting portions 7c and 7d are vertically, front and rear, and left and right directions by the weight of the reflecting plate 7. It is preferable to contact the side wall 8d with a predetermined contact pressure so that the reflector 7 does not move. If it does in this way, since it becomes possible to surface-contact the reflection parts 7c and 7d and the side wall part 8d with a predetermined contact pressure, the accommodation state of the reflecting plate 7 accommodated in the accommodating part 8a can be made more stable. It becomes possible.

  Furthermore, the illuminating device 1 according to the present embodiment includes a light guide plate 2 formed in a square plate shape, an LED 3 disposed so as to face the end surface 2a of the light guide plate 2, and a housing portion formed in a flat box shape. A housing 8 having 8a, a diffusion plate 6 formed in a square plate shape substantially similar to the light guide plate 2 and fixed to the housing 8, and a plurality of members for fixing the housing 8 and the diffusion plate 6 And a screw 14. The upper surface of the accommodating portion 8a is opened, and the light guide plate 2 is accommodated in the accommodating portion 8a so that the LED 3 is accommodated and the thickness direction of the light guide plate 2 coincides with the vertical direction. The diffusing plate 6 is disposed so that the thickness direction of the diffusing plate 6 coincides with the vertical direction, and is fixed to the accommodating portion 8a so as to close the opening of the accommodating portion 8a. When viewed from above and below, the corners of the light guide plate 2 and the corners of the diffusion plate 6 overlap each other, and the screws 14 are arranged at the corners of the light guide plate 2. At the corners of the light guide plate 2 where the screws 14 are arranged, the notches 2h and 2j for preventing the shaft 14 of the screws 14 from contacting the light guide plate 2 cut out at least the corners of the light guide plate 2. Part of the shaft portion of the screw 14 is arranged in the notches 2h and 2j.

  Thus, in this embodiment, at least the notch portions 2h and 2j for preventing the shaft portion of the screw 14 from contacting the light guide plate 2 are provided at the corners of the light guide plate 2 where the screws 14 are disposed. A part of the shaft portion of the screw 14 is arranged in the notches 2h and 2j. That is, in this embodiment, the notches 2h and 2j formed at the corners of the light guide plate 2 and in which a part of the shaft portion of the screw 14 is disposed are formed so as not to surround the entire circumference of the shaft portion of the screw 14. ing. Therefore, in this embodiment, it is possible to suppress a decrease in luminance at the corners of the diffusion plate 6 that overlaps with the corners of the light guide plate 2 when viewed from above and below. Therefore, in this embodiment, even if the housing 8 and the diffusion plate 6 are fixed to each other with the screws 14 at the corners of the diffusion plate 6, a reduction in luminance at the corners of the diffusion plate 6 is suppressed, and the lighting device 1. It is possible to suppress the luminance unevenness.

  When the through hole through which the shaft portion of the screw 14 is inserted is formed at the corner of the light guide plate 2, the through hole is formed closer to the center of the light guide plate 2 than the notches 2h and 2j. The screw 14 is disposed closer to the center of the lighting device 1 than the above-described form. Since the screw hole 6c formed in the protrusion part 6b of the diffusion plate 6 will be formed in the center side of the diffusion plate 6 when the screw 14 is arrange | positioned at the center side of the illuminating device 1, the thickness of the front-back direction of the protrusion part 6b is formed. And the thickness in the left-right direction may increase. When the thickness in the front-rear direction and the thickness in the left-right direction of the protrusion 6b is increased, the peripheral edge of the light exit surface 6a is likely to be dark due to the influence of the protrusion 6b. If the notches 2h and 2j are formed in the portion, it is possible to prevent such a problem from occurring.

  As in this embodiment, the notches 2h and 2j are preferably recessed toward the center of the light guide plate 2. In this case, by performing C chamfering on the corner of the light guide plate 2, the shaft portion of the screw 14 is compared with the case where the notches 2 h and 2 j are formed in the corner of the light guide plate 2. It is possible to reduce the cutout amount of the cutout portions 2h and 2j for preventing contact with the light guide plate 2. Accordingly, it is possible to suppress a decrease in the amount of light emitted from the corner portion of the light guide plate 2 toward the corner portion of the diffusion plate 6, and as a result, it is possible to effectively reduce the luminance at the corner portion of the diffusion plate 6. It becomes possible to suppress.

  Like this form, it is preferable that at least one part of the side surface of the notch parts 2h and 2j is formed in a concave curved surface shape. According to the study of the present inventor, compared to the case where the side surfaces of the notches 2h and 2j are configured by a combination of only planes, the side surfaces of the notches 2h and 2j include a concave curved surface. It is possible to effectively suppress a decrease in luminance at the corners of the diffusion plate 6.

  As in the present embodiment, the light guide plate is connected to the side surface of the notch portion 2h on the curved surface portion 2p that is a concave curved surface having a quarter arc shape when viewed from the top and bottom, and the end portion of the curved surface portion 2p. 2 end surface 2c or planar surface portion 2q connected perpendicularly to end surface 2d, and the side surface of notch portion 2j has a concave curved surface with a 1/4 arc shape when viewed from above and below. The curved surface portion 2s, the planar surface portion 2t connected to the end surface 2c or 2d of the light guide plate 2 and connected to the end portion of the curved surface portion 2p, and the end portion of the curved surface portion 2p and the light guide plate 2 It is preferable that a flat planar portion 2u connected so as to be orthogonal to the end surface 2b.

  If it does in this way, it will become possible to prevent that the sharp edge part arises in the outer peripheral surface of the light-guide plate 2. FIG. In addition, in this way, it becomes possible to increase the area of the side surface of the notch portions 2h, 2j as compared to the case where the side surfaces of the notch portions 2h, 2j are formed only by the curved surface portion. It is possible to more effectively suppress a decrease in luminance at the corners of the diffusion plate 6. That is, in this way, it is possible to more effectively suppress a decrease in luminance at the corners of the diffusion plate 6 while preventing sharp edges from occurring on the outer peripheral surface of the light guide plate 2.

  As in this embodiment, the light guide plate 2 is formed in a square plate shape, the diffusion plate 6 is formed in a square plate shape substantially similar to the light guide plate 2, and the accommodating portion 8a and the diffusion plate 6 are The left and right directions of the two screws 14 arranged on the front side are fixed to each other by screws 14 at each of the four corners of the diffusion plate 6, and the notches 2 h and 2 j are formed at each of the four corners of the light guide plate 2. And the pitch in the left-right direction of the two screws 14 arranged on the rear side are preferably different. If it does in this way, it will become possible to fix the diffusing plate 6 with the correct direction with respect to the accommodating part 8a. In other words, it is possible to prevent a wrong assembly of the diffusion plate 6 with respect to the housing portion 8a.

(Other embodiments)
In the form mentioned above, the 1st positioning part which positions the board | substrate set 12 with respect to the accommodating part 8a in the left-right direction by the both end surfaces 4p and 4q of the left-right direction of the lower end side part of LED mounting board 4a, and the two ribs 8p. 18 is configured, but the first positioning portion 18 may be configured by the left and right end surfaces of the LED mounting substrate 4a and the side surface portions 8g and 8h. Moreover, in the form mentioned above, although the 1st positioning part 18 is comprised by the LED mounting board | substrate 4a and the accommodating part 8a, the 1st positioning part may be comprised by the connection board 4b and the accommodating part 8a. For example, the first positioning portion may be configured by the rear end side connecting portion 4g and the two ribs 8q, or the first positioning portion may be configured by the intermediate connecting portion 4j and the two ribs 8r. Also good. Further, in addition to the first positioning portion 18, a first positioning portion constituted by the connection substrate 4 b and the accommodating portion 8 a may be provided.

  In the embodiment described above, the connection board 4b and the housing part 8a constitute the second positioning part 19 for positioning the board set 12 with respect to the housing part 8a in the front-rear direction. However, the LED drive board 5 and the housing part 8a are configured. The 2nd positioning part may be comprised by these. For example, the second positioning portion may be configured by the LED drive substrate 5 and the two ribs 8r and the ribs 8t. In this case, the extension portion 4f may not be formed on the connection substrate 4b. Further, in addition to the second positioning portion 19, a second positioning portion constituted by the LED drive substrate 5 and the accommodating portion 8a may be provided.

  In the embodiment described above, the restricting portion 20 that restricts the upward movement of the connection substrate 4b is composed of the rear-end-side connection portion 4g and the two ribs 8q, but the intermediate connection portion 4j and the two ribs The restriction portion may be configured by 8r. In this case, the width H2 of the intermediate connection portion 4j is wider than the distance D2 in the left-right direction between the two ribs 8r.

  In the embodiment described above, the three convex portions 2f and 2g are formed on the light guide plate 2, but the number of convex portions formed on the light guide plate 2 may be one or two. It may be more than one. Moreover, in the form mentioned above, the anti-mounting surface 4k and the side surface part 8e of the LED mounting substrate 4a may contact. That is, the elastic member 16 may not be disposed between the LED mounting substrate 4a and the side surface portion 8e. In the embodiment described above, an elastic member may be disposed between the side surface portion 8f and the reflection portion 7b instead of or in addition to the elastic member 16.

  In the above-described embodiment, if the reflecting plate 7 can be fitted into the accommodating portion 8a so that the reflecting plate 7 does not move relative to the accommodating portion 8a in the vertical direction, the front-rear direction, and the left-right direction by the weight of the reflecting plate 7. The reflecting portion 7b may not be in contact with the side surface portion 8f with a predetermined contact pressure, and the reflecting portions 7c and 7d may not be in contact with the side surface portions 8g and 8h with a predetermined contact pressure. Moreover, in the form mentioned above, the reflection parts 7c and 7d do not need to be formed in the reflecting plate 7. FIG. In this case, both left and right end surfaces of the reflecting portion 7a may be in contact with the side surface portions 8g and 8h with a predetermined contact pressure. Further, the reflecting portion 7 b may not be formed on the reflecting plate 7. In this case, the front end surface of the reflecting portion 7a may be in contact with the side surface portion 8f with a predetermined contact pressure. In addition, when the reflecting portions 7b, 7c, 7d are not formed, the end surfaces 2b, 2c, 2b of the light guide plate 2 are coated with a light reflecting function, or a reflective tape is attached, It is preferable to form a light reflecting portion on the end faces 2b, 2c, 2b.

  In the embodiment described above, the cutout portion 2h is composed of the curved surface portion 2p and the two flat surface portions 2q and 2r. However, the cutout portion 2h is composed of the curved surface portion 2p and one flat surface portion. May be. Similarly, the notch portion 2j is also composed of a curved surface portion 2s and two plane portions 2t and 2u, but the notch portion 2j is also composed of a curved surface portion 2s and one plane portion. Also good. In the embodiment described above, the entire side surfaces of the notches 2h and 2j may be curved surfaces, or the side surfaces of the notches 2h and 2j may be configured by a combination of only flat surfaces. Further, the chamfering process may be performed on the corner portion of the light guide plate 2 so that the notches 2 h and 2 j may be formed at the corner portion of the light guide plate 2. Moreover, in the form mentioned above, the number of the screws 14 for fixing the diffusion plate 6 and the accommodating part 8a may be two or three, and may be five or more.

  In the above-described embodiment, the shape of the lighting device 1 when viewed from the up-down direction may be a rectangular shape, a rectangular shape other than a rectangular shape or a square shape, a pentagonal shape, a hexagonal shape, an octagonal shape, or the like. It may be a polygonal shape other than the quadrangle. That is, the light guide plate 2 and the diffusing plate 6 may be formed in a rectangular flat plate shape, may be formed in a rectangular flat plate shape other than the rectangular shape and the square shape, a pentagonal shape, a hexagonal shape, an octagonal shape, or the like. It may be formed in a polygonal flat plate shape other than the quadrangle.

  In the embodiment described above, the light guide plate 2 may not have the convex portions 2f and 2g. Moreover, in the form mentioned above, the rear-end surface 7e of the reflection part 7a does not need to contact the LED mounting board 4a. In the above-described embodiment, a screw hole into which the shaft portion of the screw 14 is inserted may be formed in the light guide plate 2.

1 Lighting device 3 LED
4a LED mounting substrate 4b Connection substrate 4e Connection portion 4f Extension portion 4k Non-mounting surface 4p Right end surface (end surface of the LED mounting substrate in the second direction)
4q Left end face (end face of LED mounting board in the second direction)
5 LED drive board 8 Case 8a Housing portion 8c Bottom surface portion 8e Side surface portion 8p Rib (first protrusion)
8q rib (2nd protrusion, 3rd protrusion)
8r rib (second protrusion)
12 substrate set 18 first positioning portion 19 second positioning portion 20 regulating portion X first direction Y second direction Z flat direction

Claims (9)

In a flat box shape, an LED, an LED mounting board on which the LED is mounted, an LED driving board on which the LED driving circuit is mounted, a connection board that connects the LED mounting board and the LED driving board, A housing having a housing portion to be formed,
The LED is mounted on one surface of the LED mounting board,
The connection board is a flexible printed board,
One surface in the flat direction of the accommodating portion is open,
In the housing portion, a board set constituted by the LED mounting board, the LED driving board and the connection board and the LED are housed,
The housing portion is formed so as to rise from the bottom surface portion constituting the other surface in the flat direction and from the bottom surface portion to one side in the flat direction, and the surface of the LED mounting substrate on which the LEDs are mounted. And a side surface portion opposite to the opposite mounting surface,
When the opposing direction of the anti-mounting surface and the side surface portion is the first direction, and the direction perpendicular to the flat direction and the first direction is the second direction,
A first positioning portion that positions the substrate set with respect to the housing portion in the second direction is configured by at least one of the LED mounting substrate and the connection substrate and the housing portion,
A second positioning portion that positions the substrate set with respect to the housing portion in the first direction is configured by at least one of the LED driving substrate and the connection substrate and the housing portion. A lighting device. The LED mounting substrate is formed in a substantially rectangular shape elongated in the second direction,
2. The lighting device according to claim 1, wherein the first positioning portion includes both end faces of the LED mounting substrate in the second direction and the housing portion.   The first positioning portion projects from both end surfaces of the LED mounting substrate in the second direction and both end surfaces of the LED mounting substrate in the second direction while projecting from the bottom surface to one side in the flat direction. The lighting device according to claim 2, wherein the lighting device includes a first protruding portion that is in contact with the lighting device. The connection board extends from the LED mounting board toward one side in the first direction and connects the LED mounting board and the LED driving board to the second direction from the connection part to the second direction. An extending portion extending,
The second positioning portion has both end surfaces in the first direction of the extending portion and both end surfaces in the first direction of the extending portion while projecting from the bottom surface to one side in the flat direction. The lighting device according to any one of claims 1 to 3, wherein the lighting device includes a second projecting portion that is in contact with the second projecting portion.   5. The lighting device according to claim 4, wherein the connection board is formed in a cross shape having two extension portions extending from the connection portion to both sides in the second direction. The LED drive substrate is accommodated in the accommodating portion so that the thickness direction of the LED drive substrate and the flat direction coincide with each other,
The said connection board is pulled out from the other side of the said flat direction of the said LED mounting board, and is connected to the other surface of the said flat direction of the said LED drive board. The illuminating device in any one of.   The lighting device according to claim 6, further comprising a restricting portion that restricts movement of the connection substrate routed along the bottom surface portion to one side in the flat direction. The connection board includes a strip-like connection portion that extends from the LED mounting board toward one side in the first direction and connects the LED mounting board and the LED driving board,
The restricting portion protrudes from the bottom surface portion to one side in the flat direction and the both end surfaces of the connection portion in the second direction come into contact with each other in the second direction. It consists of a protrusion and
The distance in the second direction between the third projecting portion that is in contact with one end surface of the connecting portion in the second direction and the third projecting portion that is in contact with the other end surface of the connecting portion in the second direction is: The lighting device according to claim 7, wherein the width of the connecting portion is shorter than the width in the second direction. The connection board includes a strip-like connection portion that extends from the LED mounting board toward one side in the first direction and connects the LED mounting board and the LED driving board,
The length of the portion of the connection portion between the LED mounting board and the LED driving board in the first direction is longer than the distance between the LED mounting board and the LED driving board in the first direction. The lighting device according to claim 1, wherein the lighting device is provided.

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