JP2017037788A - Surface lighting apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a surface lighting apparatus adopting a simple structure, making thin an entire apparatus, and making light in weight.SOLUTION: A surface lighting apparatus comprising at least: a light source unit including a plurality of LEDs; and a light guide plate including an end surface that faces the side-view LEDs and that serves as an incidence surface, is configured such that an accommodation part configured from a through-hole formed in a longitudinal direction of a housing and accommodating the light source unit and the light guide unit is covered with a front substrate and a rear substrate, the light source unit is fixed in a state in which a normal of a surface on which the LEDs are mounted is orthogonal to a normal of an emission surface of each of the LEDs and in which the normal of the emission surface of each of the LEDs is parallel to a normal of the incidence surface of the light guide plate, and the front substrate exhibits light transmissivity, a display part in which a predetermined shape is cut out being provided in front of the front substrate.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a planar illumination device including a light source unit including LEDs and a light guide plate.

  Conventionally, one of the reflective case and the light diffusing case is formed in a box shape by a substrate and flanges arranged at both ends of the substrate facing each other, and the other is also the substrate and the one facing the substrate. The reflection case and the light diffusing case are housed in a sandwich-like manner between the substrates, and the reflection case and the light diffusing case are fitted and arranged. Among them, the display body formed by arranging the LED light source on the flange facing the incident end face of the light guide panel, the frame material arranged so as to fit one or both ends of the display body facing each other, and the frame material A planar illumination device including a removable front cover panel that covers an illumination surface of a light diffusion case is known (see Patent Document 1).

Japanese Patent No. 4520494

  However, in the structure of Patent Document 1, the frame material uses a bar material having a U-shaped cross section at the upper and lower ends of the display main body, and uses a bar material having an L-shaped cross section at the left and right end parts. In order to fix the screws that are inserted into the standing piece on the back side, the reflection case of the display body, the light guide panel, and the light diffusion case with the nut on the surface side of the light diffusion case, The thickness is increased as a whole, and the structure becomes complicated.

  Therefore, the present invention solves such problems, and an object of the present invention is to provide a planar lighting device that adopts a simple structure, reduces the thickness of the entire device, and reduces the weight. .

  In order to solve the above problems, the planar illumination device according to claim 1 of the present invention includes a light source unit having a plurality of LEDs, and a light guide plate having an end surface facing the side view type LEDs as an incident surface. A planar lighting device comprising a through hole formed in the front-rear direction of the housing, wherein the light source portion and the light guide plate are accommodated by a front substrate and a rear substrate. The light source unit has a normal of the surface on which the LED is mounted and a normal of the exit surface of the LED, and a normal of the exit surface of the LED and an entrance surface of the light guide plate. The front substrate is fixed in a state of being parallel to the normal line, the front substrate has translucency, and a display portion having a predetermined shape cut out is disposed on the front side.

  Moreover, the planar illuminating device of Claim 2 of this invention is a planar illuminating device of Claim 1, WHEREIN: The said display part consists of a thin film film body or a thin film sheet body.

  Moreover, the planar illuminating device of Claim 3 of this invention is a planar illuminating device of Claim 1 or Claim 2, Comprising: The said housing | casing is formed from a synthetic resin board.

  Moreover, the planar illuminating device of Claim 4 of this invention is a planar illuminating device of any one of Claims 1-3. WHEREIN: The said light source part is in the mounting part in the said accommodating part. The thickness dimension of the mounting portion is set so that the emission surface of the LED is positioned at a substantially central portion of the thickness dimension of the incident surface of the light guide plate.

  The planar illumination device according to claim 5 of the present invention is the planar illumination device according to claim 4, wherein the mounting portion is a stepped portion extending from the housing to the housing portion side. Is.

  A planar illumination device according to a sixth aspect of the present invention is the planar illumination device according to any one of the first to fifth aspects, wherein the casing has an outer edge at the casing. The mounting portion is provided so that the thickness dimension of the body is reduced, the outer light source portion is disposed in the mounting portion so that the emission surface of the LED faces the outer side of the housing, and the outer position of the outer edge portion is set. The light diffusion part is fixed in a state of being sandwiched between the front substrate and the rear substrate formed larger than the outer shape of the housing.

  In the planar lighting device of the present invention, a through-hole as a housing portion is formed in a housing, a light source unit and a light guide plate are housed in the housing portion, and are covered with a front substrate and a rear substrate. By adopting the structure, it is possible to reduce the thickness of the entire apparatus and reduce the weight.

It is a perspective view of the planar illuminating device in the Example of this invention. It is the rear view which removed the back board | substrate of the planar illuminating device in the Example of this invention. It is AA expanded sectional drawing of the planar illuminating device in the Example of this invention of FIG. It is a front view of the planar illuminating device in another Example of this invention. It is BB expanded sectional drawing of FIG. 4 of the planar illuminating device in another Example of this invention.

  Hereinafter, a planar illumination device according to an embodiment of the present invention will be described with reference to the drawings. In this apparatus, the side that emits light from the light source unit is the front, and the side that faces the side that emits the light is the rear.

  As shown in FIGS. 1 to 3, the planar lighting device according to the embodiment of the present invention is mainly housed in a housing 40 disposed between the front substrate 10 and the rear substrate 30. A light source unit 50 having a plurality of LEDs 51 and a light guide plate 60 are accommodated in the unit 41, and a predetermined shape is cut out, and the display unit 20 is provided on the front side of the front substrate 10. Thereby, the planar illumination device emits light emitted from the LED 51 from the predetermined cutout shape 21 in the display unit 20 through the emission surface 63 which is one main surface of the light guide plate 60.

  The front substrate 10 has transparency and emits light emitted from the light guide plate 60 to the front side. The said front board | substrate 10 is a part used as the front panel of a planar illuminating device, and an external shape is formed in predetermined shape so that there may be a design property. Further, the front substrate 10 is made of, for example, a synthetic resin such as acrylic resin or vinyl chloride, and the thickness dimension is about 0.5 mm to 1 mm.

  The display unit 20 is disposed on the front substrate 10 in a state where a predetermined shape is cut out, and emits light according to the cut-out shape 21. The display unit 20 includes, for example, a thin film layer having adhesiveness on one side, and is adhered and fixed to the front substrate 10. In detail, the display part 20 consists of synthetic resins, such as a vinyl chloride of a thin film body or a thin film sheet body. Moreover, the display part 20 will not be restrict | limited especially if various designs, such as a character and a figure, can be cut out, A so-called cutting sheet can be used.

  The rear substrate 30 has light shielding properties and reflectivity, and reflects light emitted from the light guide plate 60 to the front side. In the planar lighting device, the rear substrate 30 is a portion that is disposed at a position facing the front substrate 10 via the housing 40 and serves as a rear panel of the device. , Formed in a predetermined shape. The rear substrate 30 is preferably substantially the same shape as the front substrate 10, but is not limited thereto. The rear substrate 30 is made of, for example, a synthetic resin such as vinyl chloride and has a thickness dimension of about 0.5 mm to 1 mm.

  The housing 40 is disposed between the front substrate 10 and the rear substrate 30 and accommodates the light source unit 50 and the light guide plate 60 therein. The casing 40 mainly forms the thickness portion of the planar lighting device, and is formed in a predetermined shape in the same manner as the front substrate 10 and the rear substrate 30. Although it is desirable that the housing 40 has substantially the same shape as that of the front substrate 10 and the rear substrate 30, it is not limited thereto.

  The casing 40 is formed of a synthetic resin plate such as a low foam PVC plate, an acrylic resin plate, or a styrene board, for example, in order to reduce the thickness and weight of the entire device, and the thickness dimension is 3 mm to 5 mm. However, it is not particularly limited as long as it is a synthetic resin plate excellent in workability. In addition, it is desirable to use a white synthetic resin plate for the casing 40 because the loss of light emitted from the light source unit 50 can be reduced.

  In addition, a housing portion 41 for housing the light source unit 50 and the light guide plate 60 is formed in a substantially central portion of the housing 40 so as to penetrate from the front side to the rear side. The housing portion 41 can be formed by dividing a region for housing the light source unit 50 and a region for housing the light guide plate 60, or can be formed integrally.

  In addition, a concave portion 42 for accommodating a wiring 54 for applying a voltage to the LED 51 is formed in communication with the accommodating portion 41 at a position outside the region where the light source portion 50 is accommodated. The concave portion 42 has a predetermined depth, and is formed, for example, from the rear side to the front side. Similarly to the housing portion 41, the concave portion 42 can be formed so as to penetrate from the front side to the rear side. .

  The light source unit 50 includes a plurality of LEDs 51 and a connecting unit 52 for arranging (mounting) the LEDs 51. The LED 51 is a side view type LED, and the connecting portion 52 is a strip having a required length so that the plurality of LEDs 51 can be arranged with a predetermined interval. At this time, the normal of the surface of the connecting portion 52 where the LED 51 is disposed and the normal of the emission surface 53 of the LED 51 are orthogonal to each other. That is, the LED 51 is disposed so that the emission surface 53 of the LED 51 faces the incident surface 61 of the light guide plate 60. In addition, a circuit board (not shown) is connected to the connecting portion 52, and is connected to a power source, a control device, etc. (not shown) via a wiring 54.

  The light guide plate 60 has a shape that can be accommodated in the accommodating portion 41, and is formed of a synthetic resin such as an acrylic resin, for example. The light guide plate 60 includes an incident surface 61 that is a side surface on which the LED 51 is disposed, an opposing surface 62 that faces the incident surface 61, an emission surface 63 that is orthogonal to the incident surface 61 and serves as one main surface, and an emission surface. It is comprised from the reflective surface 64 used as the other main surface facing the surface 63. FIG. The thickness dimension of the incident surface 61 is formed substantially equal to the thickness dimension of the emission surface 53 of the LED 51 or larger than the thickness dimension.

  Further, a prism structure 65 made of, for example, a plurality of dots or the like is formed on the reflection surface 64 side, so that incident light on the incident surface 61 irradiated from the LED 51 is emitted from the emission surface 63 in a planar shape. Can do. Further, it is desirable to provide a reflection sheet (not shown) or the like on the reflection surface 64 side in order to reflect the light that has passed through the reflection surface 64 to the light guide plate 60.

  The planar lighting device configured as described above is assembled as follows, but it is needless to say that the order of the assembly process may be different. First, the housing 40 in which the through hole serving as the accommodating portion 41 is formed is fixed to the front substrate 10. The housing portion 41 has an outer shape slightly larger than the light guide plate 60, and a predetermined dimension capable of installing the light source portion 50 is secured in order to allow the light of the LED 51 to enter from the incident surface 61 of the light guide plate 60. ing. Thereby, the opening part of the front side in the accommodating part 41 will be in the state covered by the front board | substrate 10. FIG. The display unit 20 may be attached and fixed to the front substrate 10 in advance, or may be attached and fixed after the planar lighting device is assembled.

  In the present embodiment, the accommodating portion 41 has a rectangular shape, and a state in which an installation space for the light source portion 50 is secured on the lower side of the accommodating portion 41 in order to allow the light of the LED 51 to enter from the lower side of the planar illumination device. Is done.

  The light source unit 50 is fixed to the mounting unit 43 disposed in the housing unit 41. More specifically, both the surface of the mounting portion 43 and the surface of the connecting portion 52 are fixed in parallel, the normal of the surface of the connecting portion 52 where the LED 51 is disposed, and the method of the emitting surface 53 of the LED 51. The line is in an orthogonal state. The mounting portion 43 is provided so as to protrude from the front substrate 10 side to the rear substrate 30 side so that the emission surface 53 of the LED 51 is positioned at a substantially central portion of the thickness dimension of the incident surface 61 of the light guide plate 60.

  In the present embodiment, the mounting portion 43 is separately provided in the housing portion 41, but may be a step portion formed by extending a part of the housing 40. In addition, the mounting portion 43 can be formed by extending a part of an adjustment plate 44 described later.

  Then, with the exit surface 63 of the light guide plate 60 facing the front substrate 10, the entrance surface 61 of the light guide plate 60 is brought into contact with the exit surface 53 of the LED 51, and the exit surface 53 of the LED 51 is incident on the light guide plate 60. The light guide plate 60 is fitted inside the housing portion 41 so as to be positioned at a substantially central portion of the thickness dimension of the surface 61, and is fixed to the housing 40 via fixing means such as an adhesive tape. At this time, the normal of the surface of the connecting portion 52 where the LED 51 is disposed and the normal of the emission surface 53 of the LED 51 are orthogonal to each other, and the normal of the emission surface 53 of the LED 51 and the light guide plate 60. It is fixed in a state where the normal line of the incident surface 61 is maintained in parallel.

  In the present embodiment, an adjustment plate 44 is disposed between the front substrate 10 and the light guide plate 60 in order to adjust the position of the light guide plate 60 in the accommodating portion 41. The adjustment plate 44 is not particularly limited as long as it transmits light emitted from the light guide plate 60, and is made of, for example, acrylic resin. The adjustment plate 44 desirably has substantially the same shape as the emission surface 63 of the light guide plate 60, but it is only necessary to have at least a region where the prism structure 65 is formed from the viewpoint of light emission.

  Finally, the wiring 54 of the light source unit 50 is accommodated in the recess 42, and a reflection sheet (not shown) is disposed on the rear side of the light guide plate 60 as necessary, and is closed by the rear substrate 30. As a result, the rear opening portion of the accommodating portion 41 is covered with the rear substrate 30.

  In the present embodiment, by installing the substantially L-shaped support portion 31 on the rear side of the rear substrate 30, a stand-type planar illumination device can be obtained. Further, for example, a penetrating hole may be provided in the upper ends of the front substrate 10, the housing 40, and the rear substrate 30 to form a suspended planar lighting device, but the present invention is not limited thereto.

  As described above, according to the planar lighting device according to the present invention described above, a simple structure of forming a through hole as the housing portion 41 in the housing 40 is adopted, and the housing portion 41 formed mainly in the housing 40 is mainly used. Since the light source unit 50 and the light guide plate 60 are assembled to each other, the assembling work can be easily performed.

  In addition, since the front substrate 10, the housing 40, and the rear substrate 30 are made of synthetic resin, each outer shape can be easily formed into a desired shape, and the planar lighting device has excellent design. It can be. In addition, the thickness dimension of the planar lighting device can be set to about 5 mm to 7 mm, so that the entire device can be reduced in thickness and weight can be reduced.

  Further, since the display unit 20 is a thin film layer having adhesiveness on one side, even if the cutout shape 21 is minute, the outer shape thereof is made clear without causing color unevenness. Light from the light plate 60 can be emitted.

  In the embodiment described above, the accommodating portion 41 is formed so as to penetrate substantially the central portion of the housing 40 and is emitted only from the front substrate 10, but is not limited thereto. For example, light can be emitted from the outer end portion of the planar illumination device together with the emission surface 63 on the front substrate 10 side.

  Specifically, as shown in FIGS. 4 and 5, a stepped mounting portion 45 is provided at the outer edge of the housing 40 so that the thickness dimension of the housing 40 is reduced, and the LED 51 emits light. The outer light source unit 55 is disposed on the mounting unit 45 such that the surface 53 faces the outer side of the housing 40. At this time, the normal of the surface of the connecting portion 52 where the LED 51 is disposed and the normal of the emission surface 53 of the LED 51 are orthogonal to each other. In addition, the emission surface 53 of the LED 51 is disposed in the same straight line as the edge of the housing 40 or slightly inward from the edge.

  In addition, the light diffusing unit 70 is provided so as to go around the edge of the housing 40. The light diffusing unit 70 diffuses light from the LED 51 of the outer light source unit 55 disposed at the edge, and for example, a light diffusing resin such as milk color or light diffusing glass can be used. . The light diffusing unit 70 is fixed at a position outside the edge of the housing 40 in a state of being sandwiched between the front substrate 10 and the rear substrate 30 that are formed larger than the outer shape of the housing 40. As a result, the outer edge of the light diffusing portion 70 is exposed outward from the edges of the two substrates 10 and 30 to emit light in the outer direction of the substrates 10 and 30 (outer parts of the planar illumination device). Can do. Moreover, the outer edge part of the light-diffusion part 70 can also be arrange | positioned inside the edge part of both the board | substrates 10 and 30, It is not restricted to this.

  Furthermore, in the above-described embodiments, the arrangement, dimensions, materials, and the like of the front substrate 10, the casing 40, and the rear substrate 30 can be changed as appropriate. For example, in the light source unit 50, the light of the LED 51 is incident from the incident surface 61 of the light guide plate 60, but the light source unit 50 is similarly disposed on the facing surface 62 side to face the incident surface 61. Light can be incident from both sides 62. Thereby, even when the shape of the light guide plate 60 becomes large, a sufficient amount of light emitted from the emission surface 63 can be ensured. Furthermore, it is needless to say that a part of the configuration can be omitted or a part of the configuration can be extracted.

DESCRIPTION OF SYMBOLS 10 Front board | substrate 20 Display part 21 Cutout shape 30 Back board 40 Housing | casing 41 Storage part 43 Mounting part 45 Mounting part 50 Light source part 51 LED
53 Outgoing surface 55 Outer light source 60 Light guide plate 61 Incident surface 63 Outgoing surface 64 Reflecting surface 70 Light diffusing unit

Claims (6)

A planar illumination device comprising at least a light source unit having a plurality of LEDs and a light guide plate whose end surface facing the side view type LED is an incident surface,
It consists of a through-hole formed in the front-rear direction of the housing, and covers the light source part and the light receiving plate in the front part and the rear board,
In the light source unit, the normal of the surface on which the LED is mounted and the normal of the exit surface of the LED are orthogonal, and the normal of the exit surface of the LED and the normal of the entrance surface of the light guide plate Are fixed in parallel,
The planar illumination device according to claim 1, wherein the front substrate has translucency, and a display portion having a predetermined shape cut out is disposed on the front side.   The planar illumination device according to claim 1, wherein the display unit is formed of a thin film body or a thin film sheet body.   The planar lighting device according to claim 1, wherein the casing is formed of a synthetic resin plate.   The light source part is disposed in a mounting part in the housing part, and the thickness dimension of the mounting part is set so that the emission surface of the LED is located at a substantially central part of the thickness dimension of the incident surface of the light guide plate. The planar illumination device according to any one of claims 1 to 3.   The planar lighting device according to claim 4, wherein the mounting part is a stepped part extending from the housing toward the housing part.   The mounting portion is provided at the outer edge of the casing so that the thickness dimension of the casing is reduced, and the outer light source unit is disposed so that the emission surface of the LED faces the outer side of the casing. The light diffusing portion is fixed in a state where the light diffusing portion is sandwiched between the front substrate and the rear substrate formed larger than the outer shape of the housing at a position outside the outer edge portion. Item 6. The planar illumination device according to any one of items 5 to 6.

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