JP3186405U - Light emitting device - Google Patents

Abstract

A light emitting device with improved luminance and uniformity of light emission is provided.
The light guide plate includes a support seat, a light entrance surface and a light exit surface that are opposite to each other. The light guide plate is supported by the support seat, and the light guide plate is embedded in the light exit surface. It has at least one first reflecting strip 33 having a first reflecting surface 331 directed to it, and at least one light emitting element 22 that emits light marching from the light entrance surface 311 to the light exit surface 312 with respect to the light guide plate 31. The light emitting unit 2 supported by the support seat 1 and at least one second light source embedded in the light guide plate 31 and disposed on the light emission surface 312 and directed toward the light entrance surface 311 and the first reflection surface 331. The light emitting element 22 has a reflecting surface 321 and is arranged and configured so that light emitted from the light emitting element 22 is sequentially reflected by the second reflecting surface 321 and the first reflecting surface 331 and emitted from the light emitting surface 312. 2 opposite And an Article 32.
[Selection] Figure 3

Description

  The present invention relates to a light emitting device, and in particular, to a light guide plate and a light emitting device in which a first reflective strip and a second reflective strip are formed on both surfaces of the light guide plate, respectively.

  A conventional light emitting diode (LED) light emitting device includes, for example, a long circuit board, a plurality of light emitting diode modules attached to the circuit board along a length direction of the circuit board, and the plurality of light emitting diodes. An elongated light guide plate disposed adjacent to the module and extending in the length direction of the circuit board, and the light guide plate emits light from the plurality of light emitting diode modules serving as point light sources. The light to be guided is guided and emitted uniformly from the light exit surface of the light guide plate.

  However, such light emitting devices still have room for improvement in brightness and uniformity.

  Therefore, an object of the present invention is to provide a light emitting device with improved luminance and uniformity of light emission.

  To achieve the above object, the present invention provides a support seat, a light guide plate supported by the support seat so that a light entrance surface and a light exit surface opposite to each other are aligned in a first direction, and the light guide plate. At least one first reflecting strip embedded and disposed on the light entrance surface and having a first reflection surface facing the light exit surface, and adjacent to the light entrance surface with respect to the light guide plate A light-emitting unit that has at least one light-emitting element that emits light traveling from the light entrance surface to the light-exit surface, and that is supported by the support seat so as to be aligned with the light guide plate in the first direction; The light emitting surface is embedded in the light emitting surface and has at least one second reflecting surface facing the light entrance surface and the first reflecting surface, and light emitted from the light emitting element is the first light emitting surface. 2 reflective surfaces and the first reflective surface To provide a light emitting device, characterized in that it comprises a second reflective strip disposed configured to be emitted successively from the light exit plane is reflected Ri.

  In the light emitting device, the light entrance surface may be a flat surface, and the first reflection surface may be arranged and inclined with respect to the light entrance surface.

  In the light emitting device, the light exit surface is a plane substantially parallel to the light entrance surface, and the second reflection surface is between the light entrance surface and the light exit surface. While being spaced apart from the surface, it can be arranged and configured to be inclined with respect to the light exit surface.

  In the light emitting device, the light entrance surface and the light exit surface may be flat surfaces that are substantially parallel to each other, and the first reflective surface and the second reflective surface may be formed in an arc surface.

  The light emitting device further includes a transparent cover formed so as to define an internal space inside and have a pair of attachment end portions sandwiching an opening communicating with the internal space, and the support seat includes the transparent cover. A pair of slots for receiving the pair of attachment ends are formed corresponding to the pair of attachment ends of the cover, and the light emitting unit and the light guide plate are enclosed by the transparent cover and accommodated in the internal space. Can be configured.

In the light emitting device, the support seat includes a bottom wall and two side walls extending from the bottom wall so as to face each other, thereby defining a storage space between the bottom wall and the two side walls, The bottom wall and the two side walls are disposed in the internal space, the light guide plate is disposed in the accommodating space so as to be sandwiched between the two side walls, and the light emitting unit is mounted in the accommodating space. The light emitting device may be configured to be attached to the circuit board.

  In the light emitting device, the light guide plate is held in the internal space by projecting from the transparent cover toward the internal space and connected to both sides of the light guide plate in a second direction orthogonal to the first direction. And a pair of connecting plates.

  In the light emitting device, each of the pair of connection plates may be configured to have a flexible curved portion.

  In the light emitting device, a cap body attached to one end of the support seat, a conductive connection plate fixed to the cap body and having a spring arm, and electrically connected to the conductive connection plate. And two conductive terminals extending so as to pass through the conductive connecting plate and the cap body, and the light emitting unit is mounted with the light emitting element, and has a predetermined gap from the light guide plate. The circuit board is further disposed with a gap therebetween, and the spring arm of the conductive connection plate is inserted into the predetermined gap and elastically contacts the circuit board to contact the circuit board. It can be configured to be electrically connected.

  In the light emitting device, the spring arm may be formed to have a first curved portion and a second curved portion that are curved and elastically contact the circuit board and the light guide plate, respectively. .

  In the light-emitting device, it is preferable that the first reflecting strip and the second reflecting strip are integrally formed with the light guide plate by extrusion molding.

  With the above structure, the luminance and the uniformity of light emission are improved as compared with the conventional light-emitting device, and therefore, it can be used for various fields where illumination is required, particularly for energy-saving illumination using LEDs.

It is a partial exploded view in which the structure of the light-emitting device in 1st preferable embodiment is shown. It is sectional drawing in which the structure of the light-emitting device in 1st preferable embodiment is shown. It is explanatory drawing in which the reflective function of the 1st and 2nd reflective strip which the light-emitting device in 1st preferable embodiment has is shown. It is a partial exploded view in which the structure of the light-emitting device in 2nd preferable embodiment is shown. It is an exploded sectional view in which the composition of the light emitting device in the 2nd preferred embodiment is shown. It is sectional drawing by which the structure of the light-emitting device in 2nd preferable embodiment is shown. It is a partially exploded view in which the structure of the light-emitting device in 3rd preferable embodiment is shown. It is a partial cross section by which the structure of the light-emitting device in 3rd preferable embodiment is shown.

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

  1 to 3 show a first preferred embodiment of a light emitting device of the present invention. FIG. 1 is a partially exploded view of the light emitting device in the first preferred embodiment, and FIG. 2 is a first preferred embodiment. It is sectional drawing of the light-emitting device in embodiment, FIG. 3 is explanatory drawing by which the effect of a light-guide plate, a 1st reflective strip, and a 2nd reflective strip is shown.

  As shown in FIGS. 1 to 3, the light emitting device in the present embodiment includes a support seat 1, a light guide plate 31, two first reflecting strips 33, a light emitting unit 2, and a second reflecting strip 32. And a transparent cover 41. In addition, what is necessary is just to provide the 1st reflective strip at least one.

  The support seat 1 includes a bottom wall 11, a plurality of radiating fins 13 extending from the bottom wall 11, and a pair of side walls 12 extending from the bottom wall 11 so as to face each other and defining the accommodation space 10 together with the bottom wall 11. And a pair of tubular portions 14 each having a slot 140 formed therein.

  The light guide plate 31 extends along a predetermined length direction L, is sandwiched between the pair of side walls 12, and is supported by the support seat 1. The light guide plate 31 is supported by the support seat 1 so that the light entrance surface 311 and the light exit surface 312 opposite to each other are aligned in a first direction X orthogonal to the predetermined length direction L. A predetermined length direction L and the first direction X both have a pair of side surfaces 313 that are opposite to each other in the second direction Y that is orthogonal to each other.

  The pair of first reflective strips 33 are embedded in the light guide plate 31 at locations where the light entrance surface 311 and the pair of side surfaces 313 of the light guide plate 31 are in contact with each other, and each of the first reflective strips 33 emits light. A first reflecting surface 331 facing the surface 312 is included.

  The light emitting unit 2 is supported by the support seat 1, is adjacent to the circuit board 21 aligned with the light guide plate 31 in the first direction X, and the light entrance surface 311 of the light guide plate 31, and is viewed from the first direction X. And a plurality of light emitting elements 22 attached to the circuit board 21 so as to be arranged along the length direction L between the pair of first reflecting strips 33. Note that at least one light emitting element 22 may be provided.

  Further, the circuit board 21 is disposed in the accommodation space 10, and each light emitting element 22 is disposed and configured so that the light emitted from each of the light emitting elements 22 travels from the light entrance surface 311 to the light exit surface 312.

  The second reflecting strip 32 is disposed on the light exit surface 312 and is embedded in the light guide plate 31 so as to be positioned between the pair of first reflecting strips 33 when viewed from the first direction X. ing. In addition, the second reflecting strip 32 has a pair of second reflecting surfaces 321 respectively facing the light reflecting surface 311 and the first reflecting surface 331 included in each of the pair of first reflecting strips 33. The pair of second reflecting surfaces 321 has the shortest distance from the light entrance surface 311 at the edges where the pair of second reflecting surfaces 321 are in contact with each other, and the pair of second reflecting surfaces 321 are mutually It has a roof-shaped cross section that is the longest at the spaced edges. Note that at least one second reflecting surface 321 may be provided.

Further, the pair of second reflecting surfaces 321 included in the second reflecting strip 32 and the pair of first reflecting strips 3 are provided.
As for the position and shape of the first reflecting surface 331 of each of the three, the light emitted from the plurality of light emitting elements 22 enters the light guide plate 31 through the light entrance surface 311 and then 2 by the pair of second reflecting surfaces 321. It is arranged and configured such that it is reflected by the two first reflecting surfaces 331 and then reflected by the two first reflecting surfaces 331 and emitted by the light emitting surface 312.

  In this embodiment, the light entrance surface 311 is a flat surface. The pair of first reflection surfaces 331 are inclined with respect to the light entrance surface 311. The light exit surface 312 is a plane substantially parallel to the light entrance surface 311. The pair of second reflecting surfaces 321 are both disposed between the light entrance surface 311 and the light exit surface 312, and are inclined with respect to the light exit surface 312.

  The transparent cover 41 is formed so as to surround and define the inner space 40 and to have a pair of mounting end portions 411 sandwiching an opening communicating with the inner space 40. The portions 411 are respectively attached to the support seat 1 by being fitted into a pair of slots 140 formed in the support seat 1. It is also possible to fix the pair of attachment end portions 411 fitted into the pair of slots 140 using an adhesive.

  When the transparent cover 41 is attached to the support seat 1, the light emitting unit 2, the light guide plate 31, the bottom wall 11, and the side wall 12 are surrounded by the transparent cover 41, that is, disposed in the internal space 40.

  Incidentally, the transparent cover 41 is preferably formed of a plastic material having a light guiding performance capable of widening the illumination angle.

  Moreover, it is preferable that the light guide plate 31, the first reflecting strip 33, and the second reflecting strip 32 are integrally formed by extrusion molding.

  The light guide plate 31 is preferably formed of a plastic material selected from, for example, polystyrene resin, polycarbonate resin, or polymethyl methacrylate resin (PMMA). In particular, it is particularly preferable to form the light guide plate 31 with a PMMA material.

  The first reflecting strip 33 and the second reflecting strip 32 are preferably formed of a mixture of a reflective paint (for example, titanium dioxide) and a resin material. As the resin material used here, for example, a material selected from polystyrene resin, polycarbonate resin, and polymethyl methacrylate resin (PMMA) is preferable. In this embodiment, the first reflecting strip 33 and the second reflecting strip 32 each use PMMA resin.

  4 to 6 show a second preferred embodiment of the light emitting device of the present invention. The light emitting device in the second preferred embodiment has a configuration similar to that of the light emitting device in the first preferred embodiment, but mainly the support seat 1 and the first reflecting strip 33 and the second reflecting strip 32. And the structure of the connection relation of the support seat 1, the light guide plate 31, and the transparent cover 41 is different.

  In this embodiment, the light guide plate 31 is connected at its side surface 313 to a pair of connection plates 42 extending so as to protrude from the transparent cover 41 toward the internal space 40, and the pair of connection plates 42 allows the inside of the transparent cover 41 to be connected. It is held in the space 40. Here, the connecting plate 42 is preferably integrally formed with the light guide plate 31 and the transparent cover 41 by extrusion. Each connecting plate 42 has a curved portion 421 that can be elastically deformed in the second direction Y between the transparent cover 41 and the light guide plate 31 with flexibility.

In addition, after opening the opening 413 between the pair of mounting end portions 411 of the transparent cover 41, the pair of mounting end portions 411 are fitted into the pair of slots 140 formed in the support seat 1. The cover 41 and the light guide plate 31 can be attached to the support seat 1.

  Furthermore, in this embodiment, the 2nd reflective strip 32 has one 2nd reflective surface 321 formed in the circular arc surface which protrudes. Each first reflecting surface 331 is also formed on a protruding arc surface. The support seat 1 is formed with a pair of U-shaped mounting recesses 150 facing each other, and the circuit board 21 is fitted to the support seat 1 with both ends fitted into the pair of U-shaped mounting recesses 150.

  7 to 8 show a third preferred embodiment of the light emitting device of the present invention. The light emitting device in the third preferred embodiment has a configuration similar to that of the light emitting device in the second preferred embodiment. In this embodiment, the connecting plate 42 does not have the curved portion 421, and the light emission surface 312 is formed in an arc surface protruding toward the transparent cover 41, thereby increasing the angle of light emission. The The light emitting device in this embodiment further includes a cap body 52, a conductive connection plate 51, and two conductive terminals 53.

  The cap body 52 is formed to have a circular bottom plate 521 and a circular pipe portion 522 that protrudes from the peripheral edge of the circular bottom plate 521 and is fixed to the one end portion 16 in the predetermined length direction L of the support seat 1. ing. The conductive connection plate 51 is formed to have a fixed plate 511 fixed to the cap body 52 and a spring arm 512 extending from the fixed plate 511 to the support seat 1 side. The pair of conductive terminals 53 are electrically connected to the conductive connection plate 51, and are extended to pass through the conductive connection plate 51 and the circular bottom plate 521 of the cap body 52, and power supply means that can provide electricity (see FIG. (Not shown).

  In addition, the light emitting unit 2 in this embodiment includes a circuit board 21 to which the light emitting element 22 is attached and a gap 100 between the light guide plate 31 and the conductive connection plate 51. The arm 512 is inserted into the gap 100 and elastically contacts the circuit board 21 to be electrically connected to the circuit board 21.

  Furthermore, as shown in FIG. 8, in this embodiment, the spring arms 512 inserted into the gap 100 are respectively bent and elastically contact the circuit board 21 and the light guide plate 31. The curved portion 514 and the second curved portion 515 are formed.

  Note that the present invention is not limited to the above-described embodiment, and various modifications in which the above-described embodiment is modified within the scope conceived by those skilled in the art are included in the present invention without departing from the spirit of the invention. .

  With the above configuration, the light emitting device of the present invention includes the first reflecting strip 33 and the second reflecting strip 32, and thus the brightness and the uniformity of light emission are improved as compared with the conventional light emitting device. Can be used in various fields where energy consumption is required, particularly in energy-saving lighting using LEDs.

DESCRIPTION OF SYMBOLS 1 Support seat 10 Housing space 100 Gap 11 Bottom wall 12 Side wall 13 Radiation fin 14 Tubular part 140 Slot 150 Mounting recessed part 16 One end part 2 Light emitting unit 21 Circuit board 22 Light emitting element 31 Light guide plate 311 Light entrance surface 312 Light emission surface 313 Side surface 32 Second reflective strip 321 Second reflective surface 33 First reflective strip 331 First reflective surface 40 Internal space 41 Transparent cover 411 Mounting end 42 Connection plate 421 Bending portion 51 Conductive connection plate 511 Fixing plate 512 Spring arm 514 First curved portion 515 Second curved portion 52 Cap body 521 Bottom plate 522 Circular tube portion 53 Conductive terminal

Claims (11)

A support seat;
A light guide plate supported by the support seat so that the light entrance surface and the light exit surface opposite to each other are aligned in the first direction;
At least one first reflecting strip embedded in the light guide plate and disposed on the light entrance surface and having a first reflecting surface facing the light exit surface;
Adjacent to the light entrance surface, the light guide plate has at least one light emitting element that emits light marching from the light entrance surface to the light exit surface, and is aligned with the light guide plate in the first direction. A light emitting unit supported by the support seat;
Light emitted from the light emitting element is embedded in the light guide plate and disposed on the light emitting surface, and has at least one second reflecting surface facing the light entrance surface and the first reflecting surface. A light emitting device comprising: a second reflecting strip arranged and configured to be sequentially reflected by the second reflecting surface and the first reflecting surface and then emitted from the light emitting surface. . The light-emitting device according to claim 1, wherein the light entrance surface is a flat surface, and the first reflection surface is disposed to be inclined with respect to the light entrance surface. The light exit surface is a plane substantially parallel to the light entrance surface;
The second reflecting surface is disposed between the light entrance surface and the light exit surface so as to be separated from the light entrance surface and the light exit surface and inclined with respect to the light exit surface. The light-emitting device according to claim 2. The said light entrance surface and the said light-projection surface are planes substantially parallel to each other, The said 1st reflective surface and the said 2nd reflective surface are formed in the circular arc surface. Light-emitting device. A transparent cover formed so as to define an internal space inside and having a pair of attachment ends sandwiching an opening communicating with the internal space;
The support seat has a pair of slots for receiving the pair of attachment ends corresponding to the pair of attachment ends of the transparent cover,
The light emitting device according to claim 1, wherein the light emitting unit and the light guide plate are surrounded by the transparent cover and accommodated in the internal space. The support seat has a bottom wall and two side walls extending from the bottom wall so as to face each other, thereby defining a receiving space between the bottom wall and the two side walls,
The bottom wall and the two side walls are disposed in the internal space, the light guide plate is disposed in the accommodating space so as to be sandwiched between the two side walls, and the light emitting unit is mounted in the accommodating space. The light emitting device according to claim 5, further comprising a circuit board, wherein the light emitting element is attached to the circuit board. A pair of connecting plates that protrude from the transparent cover toward the internal space and are connected to both sides of the light guide plate in a second direction orthogonal to the first direction to hold the light guide plate in the internal space. The light-emitting device according to claim 5, further comprising: The light emitting device according to claim 7, wherein each of the pair of connection plates has a curved portion having flexibility. A cap body attached to one end of the support seat, a conductive connection plate fixed to the cap body, and having a spring arm, electrically connected to the conductive connection plate, and the conductive body Two conductive terminals extending so as to pass through the connecting plate and the cap body,
The light emitting unit further includes a circuit board on which the light emitting element is attached and is disposed with a predetermined gap from the light guide plate, and the spring arm included in the conductive connection plate has the predetermined The light-emitting device according to claim 5, wherein the light-emitting device is inserted into the gap and elastically contacts the circuit board and is electrically connected to the circuit board. The spring arm is formed so as to have a first curved portion and a second curved portion that are respectively curved and elastically contact the circuit board and the light guide plate. 9. The light emitting device according to 9. 2. The light emitting device according to claim 1, wherein the first reflecting strip and the second reflecting strip are integrally formed with the light guide plate by extrusion molding.

Images