JP6667225B2 - Planar lighting device - Google Patents

Description

  The present invention relates to a planar lighting device including a light source unit including an LED and a light guide plate.

  Conventionally, one of a reflection case and a light diffusion 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 formed of the substrate and one of the opposite sides of the substrate. The reflection case and the light diffusion case are sandwiched between the above-mentioned substrates, and the light guide panel is housed in a sandwich shape and fitted and arranged. A display body formed by arranging an LED light source on a flange facing the incident end face of the light guide panel, a frame material arranged to fit one or both ends facing the display body, and a frame material 2. Description of the Related Art 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 Literature 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 a bar material having an L-shaped cross section at the left and right ends, and the surface of the main body is used. In order to fix the stand-up piece on the back side, the reflection case of the display body, the light guide panel and the screw inserted through the light diffusion case with nuts on the front side of the light diffusion case, The thickness becomes thicker as a whole, and the structure becomes complicated.

  Therefore, the present invention is to solve such a problem, and it is an object of the present invention to provide a planar lighting device which adopts a simple structure, reduces the thickness of the entire device, and reduces the weight. .

In order to solve the above-mentioned problem, the planar lighting device according to claim 1 of the present invention has a light source unit having a plurality of LEDs and a light guide plate having an end surface facing the side-view type LED as an incident surface. And a through-hole formed in the front-rear direction of a housing made of one member, wherein the light source unit and the light guide plate are housed in a front substrate and a rear substrate. In the light source unit, the normal of the surface on which the LED is mounted is perpendicular to the normal of the emission surface of the LED, and the normal of the emission surface of the LED is A display unit that is fixed in a state where the normal to the incident surface of the light plate is parallel to the front substrate, and the front substrate has a light-transmitting property, and emits light in accordance with a cutout shape cut into a predetermined shape in the plane. There is disposed on the front side, at outer edges of the housing, the thickness of the housing The mounting portion is provided so that the size is reduced, and the outer light source portion is disposed on the mounting portion so that the emission surface of the LED faces the outside of the housing. The light diffusion portion is fixed in a state where the light diffusion portion is sandwiched between the front substrate and the rear substrate formed larger than the outer shape of the housing .

  In the spread illuminating apparatus according to a second aspect of the present invention, in the spread illuminating apparatus according to the first aspect, the display section is formed of a thin film or a thin sheet.

  According to a third aspect of the present invention, in the spread illuminating apparatus according to the first or second aspect, the housing is formed of a synthetic resin plate.

  Further, in the spread illuminating apparatus according to claim 4 of the present invention, in the spread illuminating apparatus according to any one of claims 1 to 3, the light source unit is mounted on a mounting unit in the housing unit. The thickness dimension of the mounting portion is set such that the emission surface of the LED is positioned substantially at the center of the thickness dimension of the incidence surface of the light guide plate.

  In the spread illuminating device according to claim 5 of the present invention, in the spread illuminating device according to claim 4, the mounting portion is a step portion extending from the housing to the housing portion side. Things.

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

It is a perspective view of the spread illuminating device in the example of the present invention. FIG. 4 is a rear view of the spread illuminating apparatus according to the embodiment of the present invention, with a rear substrate removed. FIG. 3 is an enlarged cross-sectional view of the spread illuminating apparatus according to the embodiment of the present invention, taken along line AA of FIG. 2. It is a front view of the spread illuminating device in another Example of this invention. FIG. 6 is an enlarged cross-sectional view of the spread illuminating apparatus according to another embodiment of the present invention, taken along line BB of FIG. 4.

  Hereinafter, a planar lighting device according to an embodiment of the present invention will be described with reference to the drawings. In the device, a side from which light from the light source unit is emitted is defined as a front side, and a side opposite to the side from which light is emitted is defined as a rear side.

  As shown in FIGS. 1 to 3, the spread illuminating apparatus according to the embodiment of the present invention mainly includes a housing formed in a housing 40 disposed between the front substrate 10 and the rear substrate 30. The light source unit 50 having a plurality of LEDs 51 and the light guide plate 60 are housed 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. Thus, the spread illuminating device emits light emitted from the LED 51 from the predetermined cutout shape 21 in the display unit 20 via the emission surface 63 that is one main surface of the light guide plate 60.

  The front substrate 10 is transparent and emits light emitted from the light guide plate 60 to the front side. The front substrate 10 is a portion to be a panel on the front side of the spread illuminating device, and is formed in a predetermined shape so as to have a design. The front substrate 10 is formed of, for example, a synthetic resin such as acrylic resin or vinyl chloride, and has a thickness of 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 in accordance with the cutout shape 21. The display unit 20 is made of, for example, a thin film layer having adhesiveness on one side, and is attached and fixed to the front substrate 10. Specifically, the display unit 20 is made of a synthetic resin such as vinyl chloride for a thin film or a thin sheet. The display unit 20 is not particularly limited as long as it can cut out various designs such as characters and figures, and a so-called cutting sheet can be used.

  The rear substrate 30 has a light shielding property and a reflective property, and reflects light emitted from the light guide plate 60 to the front side. The rear substrate 30 is disposed at a position facing the front substrate 10 via the housing 40 in the spread illuminating device, and serves as a panel on the rear side of the device. , Are formed in a predetermined shape. It is desirable that the rear substrate 30 has substantially the same shape as the front substrate 10, but it is not limited to this. The rear substrate 30 is formed of, for example, a synthetic resin such as vinyl chloride, and has a thickness of about 0.5 mm to 1 mm.

  The housing 40 is disposed between the front substrate 10 and the rear substrate 30, and houses the light source unit 50 and the light guide plate 60 therein. The housing 40 mainly forms a 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. Also in the case 40, it is desirable to have substantially the same shape as the front substrate 10 and the rear substrate 30, but it is not limited to this.

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

  A housing 41 for housing the light source unit 50 and the light guide plate 60 is formed substantially in the center of the housing 40 so as to penetrate from the front side to the rear side. The accommodating portion 41 can be formed by dividing an area accommodating the light source section 50 and an area accommodating the light guide plate 60, or can be formed integrally with each other.

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

  The light source unit 50 includes a plurality of LEDs 51 and a connecting unit 52 for disposing (mounting) the LEDs 51. The LED 51 is a side-view LED, and the connecting portion 52 is a strip having a required length so that the plurality of LEDs 51 can be arranged at a predetermined interval. At this time, the normal line of the surface of the connecting portion 52 on which the LED 51 is provided is perpendicular to the normal line of the emission surface 53 of the LED 51. That is, the LEDs 51 are arranged so that the emission surface 53 faces the incident surface 61 of the light guide plate 60. Further, a circuit board (not shown) is connected to the connection section 52, and is connected to a power supply, a control device, and the like (not shown) via a wiring 54.

  The light guide plate 60 has a shape that can be accommodated in the accommodation portion 41, and is formed of, for example, a synthetic resin such as an acrylic resin. The light guide plate 60 includes an incident surface 61 that is a side surface on which the LEDs 51 are arranged, an opposing surface 62 that faces the incident surface 61, an emission surface 63 that is orthogonal to the incident surface 61 and is one main surface, and an emission surface 63. And a reflection surface 64 which is the other main surface facing the surface 63. The thickness dimension of the incident surface 61 is formed substantially equal to or larger than the thickness dimension of the emission surface 53 of the LED 51.

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

  The spread illuminating apparatus thus constructed is assembled as follows, but it goes without saying that the order of the assembling steps may be different. First, the case 40 in which the through hole serving as the accommodation 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 has a predetermined size in which the light source unit 50 can be installed in order to make light of the LED 51 enter from the incident surface 61 of the light guide plate 60. ing. As a result, the front opening portion of the housing portion 41 is covered by the front substrate 10. The display unit 20 may be attached and fixed to the front substrate 10 in advance, or may be attached and fixed after assembling the spread illuminating device.

  In the present embodiment, the housing 41 has a rectangular shape, and the space for the light source unit 50 is secured below the housing 41 in order to allow the light of the LED 51 to enter from below the planar lighting device. Is done.

  The light source unit 50 is fixed to the mounting unit 43 provided in the housing unit 41. More specifically, the surface of the mounting portion 43 and the surface of the connecting portion 52 are fixed in a state of being parallel to each other, and the normal of the surface of the connecting portion 52 where the LED 51 is disposed and the normal of the emitting surface 53 of the LED 51 are fixed. The line is perpendicular to the line. The mounting portion 43 is provided so as to protrude from the front substrate 10 side to the rear substrate 30 side such that the emission surface 53 of the LED 51 is located substantially at the center 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 may be formed by extending a part of an adjustment plate 44 described later.

  Then, with the light emitting surface 63 of the light guide plate 60 facing the front substrate 10, the light incident surface 61 of the light guide plate 60 is brought into contact with the light emitting surface 53 of the LED 51, and the light emitting surface 53 of the LED 51 is incident on the light guide plate 60. The light guide plate 60 is fitted into the housing portion 41 so as to be located substantially at the center 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 line of the surface of the connecting portion 52 where the LED 51 is disposed is orthogonal to the normal line of the emission surface 53 of the LED 51, and the normal line of the emission surface 53 of the LED 51 and the light guide plate 60 Are 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 provided 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 accommodation section 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, an acrylic resin. The adjusting 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 concave portion 42, and a reflection sheet (not shown) is provided on the rear side of the light guide plate 60 as necessary, and the lid is closed by the rear substrate 30. As a result, the rear opening portion of the housing portion 41 is covered by the rear substrate 30.

  In this embodiment, a stand-type spread illuminating device can be obtained by installing the substantially L-shaped support portion 31 on the rear side of the rear substrate 30. In addition, for example, a through-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.

  According to the spread illuminating apparatus according to the present invention described above, a simple structure in which a through hole is formed as the housing portion 41 in the housing 40 is adopted, and the housing portion 41 formed in the housing 40 is mainly used. Since the light source unit 50 and the light guide plate 60 are accommodated in the apparatus, the assembling operation can be easily performed.

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

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

  In the above-described embodiment, the housing portion 41 is formed so as to penetrate substantially the center of the housing 40 and is emitted only from the front substrate 10, but is not limited to this. For example, light can be emitted from the outer end 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 step-like mounting portion 45 is provided at the outer edge of the housing 40 so that the thickness of the housing 40 is reduced, and The outer light source unit 55 is disposed on the placement unit 45 such that the surface 53 faces the outside of the housing 40. At this time, the normal line of the surface of the connecting portion 52 on which the LED 51 is provided is perpendicular to the normal line of the emission surface 53 of the LED 51. 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.

  Further, the light diffusing unit 70 is provided so as to go around the edge of the housing 40. The light diffusion portion 70 diffuses light from the LED 51 of the outer light source portion 55 provided at the edge, and for example, a light diffusion resin or light diffusion glass of milky half color or the like can be used. . The light diffusion unit 70 is fixed at a position outside the edge of the housing 40 while being sandwiched between the front substrate 10 and the rear substrate 30 that are formed larger than the outer shape of the housing 40. Thus, the outer edges of the light diffusion unit 70 are exposed outward from the edges of the substrates 10 and 30 to emit light in the outer directions of both the substrates 10 and 30 (the outer locations of the planar lighting device). Can be. In addition, the outer edge of the light diffusion unit 70 can be disposed inside the edge of the substrates 10 and 30, but is not limited to this.

  Further, in the above-described embodiment, the arrangement, dimensions, materials, and the like of the front substrate 10, the housing 40, and the rear substrate 30 can be appropriately changed to be implemented. For example, in the light source unit 50, the light of the LED 51 is made to enter from the incident surface 61 of the light guide plate 60, but the light source unit 50 is similarly arranged on the facing surface 62 side to face the incident surface 61. Light can be incident from both of the surfaces 62. Thereby, even when the shape of the light guide plate 60 becomes large, it is possible to sufficiently secure the amount of light emitted from the emission surface 63. Further, it is needless to say that a part of the configuration can be omitted or a part of the configuration can be extracted.

Reference Signs List 10 front substrate 20 display unit 21 cutout shape 30 rear substrate 40 housing 41 housing unit 43 mounting unit 45 mounting unit 50 light source unit 51 LED
53 Outgoing surface 55 Outer light source unit 60 Light guide plate 61 Incident surface 63 Outgoing surface 64 Reflecting surface 70 Light diffusing unit

Claims (5)

A planar lighting device comprising at least a light source unit having a plurality of LEDs, and a light guide plate having an end surface facing the LEDs of a side-view type serving as an incident surface,
It consists of a through hole formed in the front-rear direction of a housing made of one member, and the light source part and the accommodation part accommodating the light guide plate are covered by a front substrate and a rear substrate,
In the light source unit, a normal to a surface on which the LED is mounted is perpendicular to a normal to an emission surface of the LED, and a normal to an emission surface of the LED and a normal to an incidence surface of the light guide plate. Are fixed in parallel,
The front substrate has a light-transmitting property, and a display unit that emits light in accordance with a cutout shape cut into a predetermined shape in a plane is disposed on a front side ,
A mounting portion is provided at an outer edge of the housing so as to reduce the thickness dimension of the housing, and the outer light source portion is mounted so that an emission surface of the LED faces the outside of the housing. The light diffusion portion is fixed in a state where the light diffusion 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. Surface illumination device.   The spread illuminating apparatus according to claim 1, wherein the display unit is formed of a thin film or a thin sheet.   The spread illuminating device according to claim 1, wherein the housing is formed of a synthetic resin plate.   The light source unit is disposed on a mounting unit in the housing unit, and a thickness dimension of the mounting unit is set such that an emission surface of the LED is located substantially at a center of a thickness dimension of an incidence surface of the light guide plate. The spread illuminating device according to any one of claims 1 to 3.   The planar lighting device according to claim 4, wherein the mounting portion is a step portion extending from the housing to the housing portion side.

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