JP2017021916A - Surface light-emitter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a surface light-emitter capable of efficiently irradiating light from front and rear faces.SOLUTION: A surface light-emitter includes: a light guide plate; an LED substrate arranged on the side of the light guide plate; an LED mounted on the LED substrate; a power supply section for supplying power to the LED; and a frame for supporting the light guide plate. A diffusion pattern is printed on a rear face side of the light guide plate or a transparent film on which the diffusion pattern is printed is stuck to the rear face side. The frame includes a support section and a covering section. The whole or a part of a side peripheral surface of the light guide plate is covered with a covering section of the frame. A protective plate may be provided on a surface side on an opposite side of the surface provided with the diffusion pattern of the light guide plate. The light guide plate and the protective plate can be made of a glass plate or an acrylic plate. An air layer may be formed between the light guide plate and the protective plate.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a planar light emitter that illuminates a surface by diffusing light emitted from an LED with a diffusion portion of a diffusion plate disposed ahead of the LED in the emission direction.

  2. Description of the Related Art Conventionally, a planar light emitter that emits light in a planar shape by diffusing light emitted from an LED at a diffusion portion of a diffusion plate is known. Planar light emitters are used in various applications such as shelf boards, top boards and side boards in storage furniture such as storage shelves and cabinets, as well as table top boards and signboards (Patent Documents 1 to 3). .

Utility Model Registration No. 3179646 JP 2003-151337 A JP 2013-232336 A

  With a planar light emitter in which light leaks from the side surface like a conventional planar light emitter, the front and back surfaces cannot be illuminated efficiently. Further, in the conventional planar light emitter, when the light guide plate is scratched, light may leak from the portion and unevenness may occur on the irradiated surface (irradiation unevenness occurs).

  The problem to be solved by the present invention is to provide a planar light emitter that can efficiently illuminate the front and back surfaces and is less likely to cause uneven irradiation.

  The planar light emitter of the present invention is a planar light emitter that illuminates in a planar manner by diffusing light emitted from an LED with a diffusion portion of a diffusion plate disposed ahead of the LED in the emission direction. An LED substrate disposed on the side of the light guide plate, an LED mounted on the LED substrate, a power supply unit that supplies power to the LED, and a frame that supports the light guide plate. A diffusion pattern is printed on the back side or a transparent film on which the diffusion pattern is printed is affixed, and the frame includes a support portion that supports the light guide plate and a covering portion that covers a side peripheral surface of the light guide plate. The optical plate is one in which all or part of the side peripheral surface is covered with the covering portion of the frame.

  In the planar light-emitting body, a light-transmitting plate can be provided with a translucent protective plate on the surface opposite to the surface on which the diffusion pattern of the light guide plate is printed or the transparent film on which the diffusion pattern is printed. The light guide plate and the protective plate may have different refractive indexes. The light guide plate and the protective plate can be glass plates or acrylic plates. An air layer may be formed between the light guide plate and the protective plate by providing a separation protrusion on both or either of the opposing surfaces of the light guide plate and the protective plate. In this case, the separation protrusion is preferably provided at a position overlapping the pattern of the diffusion pattern when viewed from a direction perpendicular to the irradiation surface of the light guide plate and / or the protection plate.

The planar light emitter of the present invention has the following effects depending on its configuration.
(1) Since all or part of the side peripheral surface of the light guide plate is covered with the covering portion, light does not leak from the side peripheral surface of the light guide plate, and both the front and back surfaces of the light guide plate are efficiently illuminated. Can do.
(2) All or part of the side peripheral surface of the light guide plate is covered with a covering portion so that light does not leak from the side peripheral surface of the light guide plate. Even if exposed to the outside, it is not dazzling.
(3) When the light guide plate is scratched, light leaks from the portion and uneven irradiation occurs. However, when a protective plate is installed, the light guide plate is hardly damaged and uneven irradiation due to the scratch is also difficult to occur.
(4) When a protective plate is installed, the LED is not arranged on the side of the protective plate, so that it does not illuminate itself, but the protective plate and the light guide plate, the protective plate and the air layer, or the light guide plate and the air It seems that the surface side of the protective plate is illuminated by the difference in the refractive index of the layers.
(5) When the light guide plate and the protective plate are directly overlapped, air accumulates between them, and the portion may not be illuminated and uneven irradiation may occur. However, an air layer is formed between the light guide plate and the protective plate by the separation protrusion. When formed, illumination unevenness due to air accumulation does not occur.
(6) When the separation protrusion is provided at a position that coincides with the pattern of the diffusion pattern, the separation protrusion is not conspicuous and the appearance is good.

The perspective view which shows an example of the planar light-emitting body of this invention. The disassembled perspective view of the planar light-emitting body shown in FIG. (A) is a top view of the planar light-emitting body shown in FIG. 1, (b) is XX sectional drawing of (a), (c) is YY sectional drawing of (a). (A) is a cross-sectional view when a separation protrusion is provided on the back surface side of the glass plate, (b) is a cross-sectional view when a separation protrusion is provided on the front surface side of the acrylic plate, and (c) is a back surface side of the glass plate. Sectional drawing at the time of providing a separation protrusion in both the surface side of an acrylic board, (d) is sectional drawing which shows an example in the case of using one glass plate as a light-guide plate. An example in the case of using the planar light-emitting body of the present invention as a decoration stand, (a) shows an example in the case where a leg is attached to the planar light-emitting body to make a decoration stand, (b) Shows an example when an adjuster is attached to a planar light emitter to form a decorative table, and (c) shows an example when a hanging tool is attached to the planar light emitter to form a decorative table.

(Embodiment)
An example of the planar light emitter of the present invention will be described with reference to the drawings. As an example, a planar light emitter 1 shown in FIGS. 1, 2 and 3A to 3C includes a horizontal rectangular frame 2, a flat light guide plate 3 supported by the frame 2, and the light guide. A protective plate 4 disposed on the surface side of the light plate 3, an LED substrate 5 disposed on the outer side in the longitudinal direction of the light guide plate 3, and an LED 5a mounted on the LED substrate 5 (including chip-shaped and modularized ones) The same applies in the present application), a light source case 6 that houses the LED substrate 5, and a power supply unit 7 that supplies power to the LED 5a. In the present application, the longer side of the planar light-emitting body 1 will be described as “long side” and the shorter side will be described as “short side”.

  The frame 2 supports the light guide plate 3 and the protection plate 4 and covers all of the side peripheral surface of the light guide plate 3 and a part of the side peripheral surface of the protection plate 4. As an example, the frame 2 shown in FIG. 2 includes two long side frames 8 and two short side frames 9. The long side frame 8 is formed by fixing a square pipe 8b inside a single long side flat bar 8a arranged vertically. The upper surface of the square pipe 8b is one step higher than the upper surface of the long side flat bar 8a. A step can be formed by fixing so as to be lowered. The short side frame 9 is obtained by fixing one short side flat bar 9b to a lower plate 9y of an angle 9a having a vertical plate 9x and a lower plate 9y, and the upper surface of the short side flat bar 9b has an angle 9a. A step is formed by making it one step lower than the upper surface of the vertical plate 9x. The step of the long side frame 8 and the step of the short side frame 9 are set to the same height, and the light guide plate 3 is placed and supported on both step portions (support portions).

  The short side flat bar 9b of the short side frame 9 is fixed at a position near the end of the lower plate 9y so that the light source case 6 is accommodated between the short side flat bar 9b and the vertical plate 9x of the angle 9. is there. A screw hole 10 is formed in the short side flat bar 9b in the thickness direction, and a through hole 11 communicating with the screw hole 10 is formed in a portion of the lower plate 9y facing the screw hole 10 of the short side flat bar 9b. (FIG. 3C) is provided, and a leg 12 (FIG. 5A), an adjuster 13 (FIG. 5B), a hanging tool 14 (FIG. 5C), etc., which will be described later, are selectively attached and detached. I can do it.

  The light guide plate 3 is for diffusing light emitted from the LEDs 5a with a diffusion portion (for example, a diffusion pattern 17 described later) and illuminating it in a planar shape. In this embodiment, the light guide plate 3 is placed on the step portion of the long side frame 8 and the short side frame 9 of the frame 2, and the entire side surfaces on both long sides are the long side flat bars 8 a ( The covering portion) is covered. The inner surface side of the long side flat bar 8a (covering portion) is mirror-finished so that light is reflected so that light does not leak out from the side surfaces on both long side sides of the light guide plate 3.

  The light guide plate 3 can have various sizes, shapes, and materials as long as the light from the LEDs 5a can be guided. As an example, the light guide plate 3 shown in FIGS. 1, 2, and 3 (a) to 3 (c) is a horizontal rectangular acrylic plate 3 having a thickness of about 5 mm, and light emitted from the LED 5 a on the back side thereof. The dot-like diffusion pattern 17 for diffusing the light is printed. The emitted light is diffused by the diffusion pattern 17 and is transmitted in a planar manner on both the front and back sides of the acrylic plate 3. In this embodiment, the diffusion pattern 17 is directly printed on the back side of the acrylic plate 3, but a transparent film (not shown) on which the diffusion pattern 17 is printed may be attached to the back side of the acrylic plate 3. The diffusion pattern 17 can also have a pattern other than dots, such as a lattice shape or a wave shape.

  Locking grooves 3 a for locking the light source case 6 are provided in parallel to the short sides of the acrylic plate 3 at locations near both short sides of the acrylic plate 3. The light source case 6 locked in the locking groove 3a is an elongated square pipe provided with a slit 6a on the surface (facing surface) facing the acrylic plate 3, and the upper locking provided above and below the slit 6a. The piece 6 b and the lower engaging piece 6 c are attached to the acrylic plate 3 by engaging the engaging groove 3 a of the acrylic plate 3. The light source case 6 can be attached to or detached from the acrylic plate 3 by sliding in the direction of arrows AA in FIG.

  Inner grooves 6d are formed at positions facing the inner surfaces of the upper and lower surfaces of the light source case 6, and the LED substrate 5 is locked in the vertical direction in the inner grooves 6d. A plurality of LEDs 5 a are mounted on the LED substrate 5, and light emitted from the LEDs 5 a is applied to the opposing surface of the acrylic plate 3. The locking groove 3a may be provided as necessary, and may not be provided when the light source case 6 can be fixed by another method.

  Each of the LED substrates 5 is provided with a power cord 18 and an AC / DC conversion circuit (not shown) so that a DC power is supplied to the LED 5a. The cord 18a connected to one LED substrate 5 is accommodated in the square pipe 8b of the long side frame 8, and is pulled out from the other end side of the square pipe 8b. The cord 18a drawn to the outside of the square pipe 8b, together with the power cord 18b connected to the other LED board 5, is drawn to the outside from a drawing hole (not shown) formed in the lower surface of the light source case 6.

  The protective plate 4 is for preventing the acrylic plate 3 from being damaged. As an example, the protective plate 4 shown in FIGS. 1, 2, and 3 (a) to 3 (c) is a horizontal rectangular shape having the same size as the acrylic plate 3, and has a refractive index different from that of the acrylic plate 3. It is the board 4, The notch part 4a notched by the step shape on the back surface side of both long sides is provided in parallel with the long side. The glass plate 4 has a thickness of 5 mm above the notch 4a and a thickness of 3 mm (total thickness 8 mm) below the notch, but the thickness of the glass plate 4 is other than this. May be. Of the both long sides of the glass plate 4, the portion below the notch 4 a is covered with a long side flat bar 8 a (covering portion) of the long side frame 8. On the other hand, of the two long sides of the glass plate 4, a portion above the notch 4 a is exposed without being covered with the covering portion.

  As shown in FIG. 4A, when the glass plate 4 is provided with a separation protrusion 20 of several tens of μm on the back surface side (the acrylic plate 3 side) and laminated on the upper surface side of the acrylic plate 3, the glass plate An air layer 19 of several tens of μm is provided between 4 and the acrylic plate 3. When the glass plate 4 is directly laminated on the acrylic plate 3, air bubbles may enter between the two plates, and light may not be irradiated in a planar shape by the air bubbles. In this regard, by forming the air layer 19 between the glass plate 4 and the acrylic plate 3 by the separation protrusions 20, it is possible to eliminate inconvenience due to bubbles. The separation protrusion 20 can be formed by directly printing a light-transmitting resin or adhesive in a dot shape, or affixing a film on which the resin or the adhesive is printed in a dot shape.

  In the example of FIG. 4A, the case where the separation protrusion 20 is formed on the back surface side of the glass plate 4 is taken as an example, but the separation protrusion is formed on the surface side of the acrylic plate 3 (glass plate 4 as shown in FIG. 4B). It can also be provided on both the back side (the acrylic plate 3 side) of the glass plate 4 and the front side (the glass plate 4 side) of the acrylic plate 3 as shown in FIG. In any case, the separation protrusion 20 is formed when the planar light-emitting body 1 of the present invention is viewed from the plane side (when viewed from the direction perpendicular to the irradiation surface) (pattern or dot pattern). It is preferably provided at a position overlapping with a lattice pattern or the like. Thus, by providing the pattern so as to overlap with the pattern of the diffusion pattern 17, the separation protrusion 20 itself does not stand out, and the appearance of the light emitting surface is not impaired by the separation protrusion 20.

  Both short sides of the acrylic plate 3 and the glass plate 4 are covered with a cover 21 so that the short sides of the acrylic plate 3 and the glass plate 4 and the light source case 6 are not visible from the outside. As an example, the cover 21 shown in FIG. 1 has an angle member provided with an upper plate 21a and a vertical plate 21b in the longitudinal direction and is closed with two side plates 21c. The cover 21 is inserted from the outside of the vertical plate 9x, with the upper plate 21a being directed to the peripheral edge on the surface side of the glass plate 4 and the vertical plate 21b being directed to the outside of the vertical plate 9x of the short side frame 9. It is fixed to the short side frame 9 by a stopper 22 such as a screw.

(Other embodiments)
In the embodiment, the light guide plate 3 is an acrylic plate and the protective plate 4 is a glass plate, but the light guide plate 3 and the protective plate 4 may be other than an acrylic plate or a glass plate.

  In the above embodiment, the case where the protective plate 4 is provided on one surface side of the light guide plate 3 is described as an example. However, as shown in FIG. You can also In this case, the light guide plate 3 is preferably made of glass that is not easily damaged, but may be made of acrylic. When made of acrylic, it is preferable to provide a film for preventing scratches on the surface. When the protective plate 4 is omitted, the entire side peripheral surface of the light guide plate 3 can be covered with the long side flat bar 8a (covering portion) of the long side frame 8, but among the side peripheral surfaces of the light guide plate 3, For example, the lower side of the back side may be covered with a covering portion, and the upper side of the half side may be exposed without being covered. In this case, it is preferable to attach a light-shielding film, a mirror-finished film, or the like to the exposed part so that light does not leak from the part.

(Example of use)
The usage example of the planar light-emitting body 1 of this invention is demonstrated with reference to drawings. The example shown to Fig.5 (a) as an example is an example in the case of using the planar light-emitting body 1 as a decoration stand. Two legs 12 are provided on the back side of the planar light emitter 1 shown in FIG. As an example, the leg 12 shown in FIG. 5 (a) includes two standing members 12a arranged at intervals and two connecting members 12b that connect ends of the standing members 12a. The connecting member 12b that connects the upper side of the standing member 12a is fixed to the short side flat bar 9b of the short side frame 9. The leg 12 can be fixed by screwing a stopper such as a screw into the screw hole 10. The structure of the leg 12 is an example, and there is no limitation on the shape, structure, number, etc. as long as the planar light emitter 1 can be supported without inhibiting the light emission of the planar light emitter 1.

  The planar light-emitting body 1 may be provided with an adjuster 13 that can be adjusted in height instead of the legs 12. As an example, an adjuster 13 shown in FIG. 5 (b) has a screw rod 13b provided upright on a base portion 13a. By screwing the screw rod 13b into the screw hole 10, the short side flat bar of the short side frame 9 is provided. It is fixed to 9b. The structure of the adjuster 13 is an example, and there is no limitation on the shape, structure, number, etc. as long as the planar light emitter 1 can be supported without inhibiting the light emission of the planar light emitter 1.

  Instead of the legs 12 and the adjusters 13, a hanging tool 14 can be provided on the planar light emitter 1. As an example, the hanging tool 14 shown in FIG. 5C is attached to the auxiliary plate 14a fixed to the back side of the short side frame 9, the wire grip 14b attached to the auxiliary plate 14a, and the wire grip 14b. The wire rope 14c is provided. The auxiliary plate 14 a shown in FIG. 5C is a horizontally long flat plate, and is attached to the bottom side of the short side frame 9 so that a part thereof protrudes outward in the longitudinal direction of the planar light emitter 1. The wire grip 14 b is attached to a portion of the auxiliary plate 14 a that protrudes outward in the longitudinal direction of the planar light emitter 1.

  As an example, the wire grip 14b shown in FIG.5 (c) is provided with the clamping part and the wire holder. The sandwiching portion includes a pair of sandwiching pieces facing each other at an interval, and covers the sandwiching pieces on the front surface side and the back surface side of the auxiliary plate, and screwing a set screw from the outside of the lower sandwiching piece, the auxiliary plate Is attached. A wire rope 14c is held by the wire holder so that the wire rope 14c can be locked or fixed at an arbitrary place. The hanging tool 14 shown in FIG. 5C is an example, and other things can be used.

  The planar light-emitting body 1 can also be used as a shelf board in addition to a decorative table. In this case, for example, the planar light-emitting body 1 is fixed to the support part of the L-shaped shelf board fixture having a support part that supports the shelf board and a back part of the shelf or a fixing part that is fixed to the wall. The fixing part of the plate fixture can be fixed to the back plate or wall of the shelf. The planar light-emitting body 1 is a top plate or a side plate of a storage furniture, a back plate, a table top plate, a partition plate between mirrors installed side by side in a restroom, etc., a fitting lighting provided on a wall or a door, a ceiling lighting, a signboard It can be used for various purposes such as lighting.

  In the above embodiment, the planar light emitter 1 is described as an example in which the glass plate 4 is used on the upper side (front side) and the acrylic plate 3 is on the lower side (back side). It can also be used upside down so that the glass plate 4 is on the lower side and the acrylic plate 3 is on the upper side. Moreover, in the said embodiment, although the case where the planar light-emitting body 1 is used flatly is used as an example, the planar light-emitting body 1 of this invention can also be used vertically. In the above-described embodiment, the case where the planar light emitter 1 has a horizontal rectangular shape is described as an example. However, the planar light emitter 1 has various shapes such as a polygon such as a square, a rhombus, and a pentagon, or a circle and an ellipse. You can also

  The planar light-emitting body 1 of the present invention can be used for various applications such as a shelf board, a side board, a back board, a top board, a partition board, and lighting.

DESCRIPTION OF SYMBOLS 1 Planar light-emitting body 2 Frame 3 Light guide plate (acrylic board)
3a Locking groove 4 Protection plate (glass plate)
4a Notch 5 LED board 5a LED
6 Light source case 6a Slit 6b Upper locking piece 6c Lower locking piece 6d Inner groove 7 Power source 8 Long side frame 8a Long side flat bar 8b Square pipe 9 Short side frame 9a Angle 9b Short side flat bar 9x Vertical plate 9y Lower plate DESCRIPTION OF SYMBOLS 10 Screw hole 11 Through-hole 12 Leg 12a Standing material 12b Connecting material 13 Adjuster 13a Base part 13b Screw rod 14 Suspension tool 14a Auxiliary plate 14b Wire grip 14c Wire rope 17 Diffusion pattern 18, 18a, 18b Power cord 19 Air layer 20 Separation protrusion 21 Cover 21a Upper plate 21b Vertical plate 21c Side plate

Claims (6)

In the planar light emitter that illuminates the surface by diffusing the light irradiated from the LED with the diffusion part of the diffusion plate arranged in the emission direction of the LED,
A light guide plate, an LED substrate disposed on the side of the light guide plate, an LED mounted on the LED substrate, a power supply unit that supplies power to the LED, and a frame that supports the light guide plate,
A transparent film on which a diffusion pattern is printed or a diffusion pattern is printed on the back side of the light guide plate is attached,
The frame includes a support portion that supports the light guide plate and a covering portion that covers a side peripheral surface of the light guide plate,
The light guide plate has all or part of its side peripheral surface covered with a covering portion of the frame,
A planar light emitter characterized by the above. The planar light emitter according to claim 1, wherein
A protective plate having translucency is provided on the surface side opposite to the surface on which the diffusion pattern of the light guide plate is printed or the transparent film on which the diffusion pattern is printed is attached,
A planar light emitter characterized by the above. The planar light emitter according to claim 1 or 2,
The light guide plate and the protective plate are made of materials having different refractive indexes.
A planar light emitter characterized by the above. The planar light emitter according to any one of claims 1 to 3,
The light guide plate or the protective plate is a glass plate or an acrylic plate.
A planar light emitter characterized by the above. The planar light emitter according to any one of claims 2 to 4,
Separation protrusions are provided on both or one of the surfaces of the light guide plate and the protection plate facing each other, and an air layer is formed between the light guide plate and the protection plate.
A planar light emitter characterized by the above. The planar light emitter according to claim 5, wherein
The separation protrusion was provided at a position overlapping the pattern of the diffusion pattern when viewed from the direction perpendicular to the light guide plate or / and the irradiation surface of the protection plate.
A planar light emitter characterized by the above.

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