WO2008007492A1

WO2008007492A1 - Light source module, surface area light-emitting unit, and surface area light-emitting device

Info

Publication number: WO2008007492A1
Application number: PCT/JP2007/059369
Authority: WO
Inventors: Yukio Yoshikawa; Kazuo Aoki; Masatoshi Kawamata; Akihiro Nishikawa; Tomohiro Yamada; Taro Nakadai
Original assignee: Koha Co., Ltd.
Priority date: 2006-07-11
Filing date: 2007-05-02
Publication date: 2008-01-17
Also published as: CN101490465A; HK1168643A1; CN102418865A; JP2015015494A; CN102418865B; JPWO2008007492A1

Abstract

[PROBLEMS] A light source module, surface area light-emitting unit, and surface area light-emitting device that have versatility, where installation work is simplified and production costs are reduced, and where irregularity of light emission and color is sufficiently suppressed. [MEANS FOR SOLVING PROBLEMS] The light source module has a light direction-converting optical element (29) and an LED (28). The light direction-converting optical element (29) has a recess (290) with a light incident surface (29A) into which light enters, a light reflecting surface (29B) for reflecting light entered from the light incident surface (29A), and a light emitting surface (29C) for emitting to a side the light reflected by the light reflecting surface (29B). The LED (28) is placed in a recess (290) of the light direction-converting optical element (29) with a gap provided in between them and applies light to the light incident surface (29A).

Description

Light source module, surface light emitting unit and surface light emitting device

Technical field

The present invention relates to a light source module, a surface light emitting unit, and a surface light emitting device, and more particularly, to a light source module, a surface light emitting unit, and a surface light emitting device that use a light emitting diode (LED) as a light emitting unit.

Background art

[0002] As is well known, fluorescent lamps are frequently used as light sources in surface light-emitting devices used for display of video images such as billboards and store lighting. However, since fluorescent lamps use harmful mercury, they have a problem that requires appropriate disposal as industrial waste. In addition, fluorescent lamps have a short running life and high running costs.

In recent years, it has been proposed to use an LED as a light-emitting lamp of a surface light-emitting device that solves such a problem. Since LEDs are manufactured based on semiconductor manufacturing technology, they have the advantages of mass production and cost saving. In recent years, white LEDs with luminous efficiency exceeding 601mZW have been put into practical use and are expected to be applied to lighting applications. However, since LEDs are point light sources, it is necessary to arrange multiple LEDs appropriately to obtain the desired illuminance while suppressing uneven illuminance as a surface emitting device.

[0004] In addition, the brightness of the LED depends on the light emission characteristics of the LED element as a single unit. It is already known that there is uneven color intensity of the LED element alone, and in applications that require lighting quality. It is required to prepare LED elements with uniform light emission characteristics. In reality, LED elements that fall within the allowable range for the desired emission characteristics are selected and used.

[0005] Conventionally, as a surface light emitting device that can achieve uniform illuminance even if individual LED elements have variations in light emission characteristics, for example, a wiring board as an element mounting board and an element mounting surface of this wiring board. An LED including a plurality of LEDs arranged in parallel and a light guide member with a diffusing portion for guiding emitted light of these LED forces to an illumination target has been proposed (Patent Document 1).

[0006] Further, as a conventional surface light-emitting device, an LED, a lens having a reflection portion that totally reflects light from the LED, and a sawtooth portion that emits light of this reflection portion force in a direction perpendicular to the optical axis, Be equipped Proposed (Patent Documents 2 and 3) and those in which a plurality of LED units each having a plurality of LEDs integrally covered with a diffusing lens are arranged in parallel in one direction (Patent Document 4). .

Patent Document 1: Japanese Unexamined Patent Application Publication No. 2004-14365

Patent Document 2: Japanese Patent Laid-Open No. 2003-8068

Patent Document 3: Japanese Patent Laid-Open No. 2003-8081

Patent Document 4: Japanese Patent Laid-Open No. 2005-17573

Disclosure of the invention

Problems to be solved by the invention

However, according to Patent Document 1, since the LEDs are attached one by one, it is necessary to attach the same number as the number of LEDs. As a result, when the light emitting area (the scale of the apparatus) is increased, the number of attachments increases accordingly, and there is a problem that the installation work becomes complicated.

[0008] According to Patent Documents 2 and 3, since the lens has not only a reflection part but also a sawtooth part, there is a problem that the shape of the lens becomes complicated and the manufacturing cost increases. In addition, since the light of LED power is emitted in a direction perpendicular to the optical axis of the lens, variations in the light emission amount and color are not averaged, and the occurrence of uneven light emission and color unevenness cannot be sufficiently suppressed. There was a problem b.

[0009] According to Patent Document 4, since a plurality of LED units are arranged in parallel in one direction, if the dimensions of the LED units in the direction perpendicular to the parallel direction are changed, the length of the LED unit is reduced. There was a need to change. As a result, there was a problem that the LED unit had to be redesigned according to the size and shape of the lighting and the application, and there was a lack of versatility. In addition, since a plurality of LED units are integrally covered with a diffusing lens in order to emit light in a planar shape, the amount of lens material used increases, and in this case as well, there is a problem that the manufacturing cost increases. It was.

[0010] Therefore, the object of the present invention is to simplify the mounting operation and reduce the manufacturing cost, sufficiently suppress the occurrence of uneven light emission and color unevenness, and provide versatility. An object is to provide a light source module, a surface light emitting unit, and a surface light emitting device. Means for solving the problem In order to achieve the above object, the present invention provides a recess having a light incident surface on which light is incident, a light incident surface force that reflects light incident thereon, and a light reflecting surface that reflects the incident light. A light direction changing portion having a light emitting surface for emitting light laterally; and a light emitting portion that is arranged with a gap in the concave portion of the light direction changing portion and that makes the light incident on the light incident surface. A light source module is provided.

(2) In order to achieve the above object, the present invention provides a unit main body having an arrangement space that can be connected to another unit main body, and arranged in the arrangement space of the unit main body to emit light. And a plurality of light-emitting lamps having a light direction changing unit that emits light emitted from the at least one light-emitting unit and emits the light laterally. To do.

(3) In order to achieve the above object, the present invention includes a plurality of surface light emitting units and a light diffusing member arranged on a light extraction side of the plurality of surface light emitting units, The light emitting unit includes a unit main body having an arrangement space that can be connected to another unit main body, at least one light emitting unit that is arranged in the arrangement space of the unit main body and emits light, and the at least one light emitting unit. Provided is a surface light emitting device comprising a plurality of light emitting lamps having a light direction changing portion that emits light emitted from one light emitting portion and emits it to the side.

The invention's effect

[0014] According to the present invention, there is versatility, simplification of the mounting operation and reduction in manufacturing cost, and generation of uneven light emission and uneven color can be sufficiently suppressed. BEST MODE FOR CARRYING OUT THE INVENTION

[0015] [First embodiment]

FIG. 1 is a perspective view showing the entire surface light emitting device including the surface light emitting unit according to the first embodiment of the present invention. FIG. 2 is an assembled perspective view showing the entire surface emitting unit according to the first embodiment of the present invention. FIG. 3 is an exploded perspective view showing the entire surface emitting unit according to the first embodiment of the present invention. FIG. 4 is a perspective view showing a connection state of the surface emitting unit according to the first embodiment of the present invention. FIG. 5 is a perspective view showing a state in which the surface emitting unit according to the first embodiment of the present invention is disconnected. FIG. 6 is a perspective view showing a state where the connection portion of the surface emitting unit according to the first embodiment of the present invention is viewed from one side. It is. FIG. 7 is a perspective view showing a state in which the connecting portion of the surface emitting unit according to the first embodiment of the present invention is viewed on the other side. FIG. 8 is a cross-sectional view showing a main part of the surface light emitting unit according to the first embodiment of the present invention. FIG. 9 is a cross-sectional view of the LED according to the first embodiment of the present invention. FIG. 10 is a diagram shown for explaining total reflection on the light reflecting surface of the light direction changing section in the light emitting lamp of the surface emitting unit according to the first embodiment of the present invention. FIG. 11 is a cross-sectional view for explaining the shape of the light direction changing portion in the light emitting lamp of the surface emitting unit according to the first embodiment of the present invention. In FIG. 1, the three directions orthogonal to each other are defined as an X direction (vertical direction of the surface light emitting device) and a Y direction (lateral direction of the surface light emitting device), respectively (thickness direction of the surface light emitting device).

[Overall Configuration of Surface Emitting Device]

In FIG. 1, a surface light emitting device denoted by reference numeral 1 includes a case 2 that opens in one direction, a plurality of surface light emitting units 3, 3,... The light diffusing member 4 that closes the opening of the case 2 on the light extraction side of the light emitting units 3, 3,. The illuminance of the surface light emitting device 1 is set to an average 平均 χ, for example.

[0017] (Configuration of Case 2)

As shown in FIG. 1, the case 2 is formed by a pair of side plates 2A, 2B facing each other and a back plate 2C connected to the two pairs of side plates 2A, 2B. ing. The material of case 2 may be a synthetic resin other than polycarbonate or a metal such as aluminum. As the external dimensions of Case 2, for example, the vertical and horizontal dimensions are both set to 1300 mm, and the thickness dimension is set to 60 mm.

[0018] The two pairs of side plates 2A, 2B have light reflecting portions 2a, 2b provided by sticking, for example, an aluminum sheet on the inner surface, and light emitted from the surface emitting units 3, 3, ... It is configured to reflect the light. Thereby, the light emitted from the surface light emitting units 3, 3,... Is reflected by the light reflecting portions 2a, 2b, and the light reflection efficiency at the side plates 2A, 2B is enhanced. The light reflecting portions 2a and 2b may be provided by a method other than the method of attaching an aluminum sheet to the inner surfaces of the side plates 2A and 2B. The rear plate 2C has a unit mounting surface 2c facing the inner surface of the light diffusing plate 4, and is configured to mount a plurality of surface emitting units 3, 3,... On the unit mounting surface 2c. Yes. The unit mounting surface 2c of the back plate 2C is, for example, painted white in order to increase the reflection efficiency of light emitted from the surface emitting units 3, 3,.

[0020] (Configuration of surface emitting units 3, 3,…)

Since the surface emitting units 3, 3,... Have substantially the same configuration, only the one surface emitting unit 3 will be described. The surface emitting unit 3 has an arrangement space 5A as shown in FIGS. Unit body 5 to be connected, circuit board 6 arranged in the space 5A of the unit body 5, and a plurality of (four in the embodiment) light-emitting lamps 7 and 7 arranged in parallel on the circuit board 6 at a predetermined interval. ,..., And a sealing member 8 that seals the arrangement space 5A by inserting the plurality of light-emitting lamps 7, 7,... On the back plate 2C of the case 2 in parallel in the vertical and horizontal directions in the same plane. Multiple (36 in this embodiment: 12 in the vertical direction and 3 in the horizontal direction) are attached. Of the surface light emitting units 3, 3,... Juxtaposed in the vertical direction, the two surface light emitting units 3, 3 adjacent to each other are connected in series by wiring (not shown), and the distance between them is set to about 100 mm. Of the surface light emitting units 3, 3,... Arranged in parallel in the horizontal direction, the two surface light emitting units 3, 3 adjacent to each other are connected in series by a first connector 25 and a second connector 27 (both will be described later). As shown in FIG. 5, it is configured to be detachable. The unit body 5 and the plurality of light emitting lamps 7 constitute a light source module. There may be one light-emitting lamp.

[0021] <Configuration of unit body 5>

The unit body 5 includes a base 10 that holds the circuit board 6 and the light-emitting lamps 7, 7,..., And a cover 11 that forms an arrangement space 5A together with the base 10, and is constituted by a long size container. It is formed and configured to be connected to another unit body. The longitudinal dimension of the unit body 5 is set to 400 mm, for example.

[0022] The base 10 has two mounting pieces 12, 12 arranged in parallel in the longitudinal direction at a predetermined interval on one side edge, and is entirely formed of a rectangular plate made of a metal material such as aluminum. As the material for the base 10, in addition to metal materials, resin materials such as ABS resin are used. The base 10 has two frames 10A and 10B that are open and closed on the cover side. It is. Both the frame bodies 10A and 10B are formed of a rectangular frame body. Between both the frame bodies lOA and 10B, a concave groove 13 that fits into both side edges of the seal member 8 is provided. On the inner surface of the frame 10A, stepped portions 14 that hold both side edges of the circuit board 6 are provided. On one side edge of the frame 10A, notches 15 and 16 for inserting cables, which are arranged in parallel at a predetermined interval in the longitudinal direction of the base, are provided. On one side edge of the frame body 10B, notches 17 and 18 for inserting cables, which are located at portions corresponding to the notches 15 and 16, respectively, are provided.

[0023] The cover 11 has a plurality (four in the present embodiment) of openings 11A, 11A, ... through which the light direction changing optical elements 29 (described later) of the light-emitting lamps 7, 7, ... are inserted. It is mounted on both side edges of the base 10. And the whole is formed of a resin material such as ABS resin. The light extraction side surface 11B of the cover 11 is formed of a light reflecting surface that reflects the emitted light from the light emitting lamps 7, 7,... A fitting protrusion 19 for mechanically connecting the surface emitting units to each other as shown in FIG. 6 is provided at one end in the longitudinal direction of the force bar 11, and as shown in FIG. 7 at the other end in the longitudinal direction. Similarly, a fitting space 20 is provided for mechanically connecting the surface emitting units to each other. The fitting protrusion 19 is provided with a plurality of (three in this embodiment) reinforcing portions 19A arranged in parallel in a direction (short direction) perpendicular to the longitudinal direction of the cover 11. On one side edge of each cover 11, notches 21 and 22 for cable insertion are provided in parallel with the dimensions between the notches 15 and 16 in parallel.

[0024] <Configuration of circuit board 6>

As shown in FIG. 8, the circuit board 6 has a wiring pattern (not shown) that is electrically connected to the electrode terminal portion exposed on the back surface of the light emitting portion (described later) of the light emitting lamps 7, 7,. The unit body 5 is arranged in the arrangement space 5A and is held by the stepped portion 14 of the base 10 (frame body 10A). An electronic component (not shown) made of a Zener diode is mounted on the circuit board 6. As a result, when any one of the light-emitting lamps 7, 7,... Stops lighting due to a failure or the like, the other light-emitting lamps 7, 7,. Further, the circuit board 6 is provided with pin holes 6A and 6B (shown in FIG. 3) which are located in the vicinity of the light emitting portion and are fitted to the positioning pins (not shown) of the optical element 29 for changing the light direction. ing. Circuit board 6 The first connector 25 is notched in the two cable connection portions (not shown) of the first cable 25 through the cables 24 that pass through the notches 15, 17, 21 and the first cable insertion hole 8C (described later). The second connector 27 is connected to each other via a cable 26 passing through 16, 18 and 22 and the second cable through hole 8D (described later).

[0025] <Configuration of luminous lamp 7, 7, ...>

As shown in FIG. 8, each of the light-emitting lamps 7, 7,... Has an LED 28 as a light-emitting unit that emits white light to the light extraction side, and light that is emitted from the LED 28 and incident to the side. It has an optical element 29 for changing light direction as a direction changing portion, and is mounted on the lamp mounting side of the circuit board 6. The distance between two light-emitting lamps 7 and 7 that are adjacent to each other is set to about 100 mm.

The LED 28 includes a blue LED element 284 that emits blue light and a silicate phosphor 285 that emits yellow light when excited by the blue light emitted from the blue LED element 284, as shown in FIG. A sealing resin 286 is sealed with a package 282 and arranged on the element mounting side of the circuit board 6. Then, based on the mixture of blue light emitted from the blue LED element 284 and yellow light emitted from the phosphor, white light is emitted as described above. As the blue LED element 284, for example, a blue LED element made of a GaN-based semiconductor compound having an emission wavelength region of 450 nm to 460 nm is used. As the phosphor 285, in addition to a silicate phosphor, a gannet phosphor such as a YAG (Yttrium Aluminum Garnet) phosphor may be used.

[0027] The nozzle / cage 282 is made of a white resin material, and has a concave portion 281 made up of an inclined surface 281a and a bottom surface 281b to be a reflector. A pair of leads 283A and 283B are led out from the bottom surface 281b of the recess 281. The blue LED element 284 is electrically connected to one end of the pair of leads 283A and 283B, and is electrically connected to the conductive pattern on the circuit board 6 at the other end of the pair of leads 283A and 283B. ing.

[0028] As shown in FIG. 8, the optical element 29 for changing the direction of light includes a light incident surface 29A for incident light emitted from the LED 28, and a light reflecting surface 29B for reflecting light incident from the light incident surface 29A. And a light emitting surface 29C that emits the light reflected by the light reflecting surface 29B to the side (obliquely front-rear direction), and is disposed on the lamp mounting side of the circuit board 6, and is entirely made of PMMA (polymethacrylate). It is formed of a transparent material such as chill. When the light emitted from the LED 28 is incident on the light incident surface 29A, most of the light is refracted, the refracted light is totally reflected by the light reflecting surface 29B, and the light emitting surface 29C is also refracted to be inclined. The light exits from the light reflection surface 29B (interface) forward and obliquely backward-sideward.

[0029] Here, the optical phenomenon of the light incident on the light reflecting surface 29B will be described with reference to FIG. When a light beam LB is incident on a material with a refractive index nl from a material with a refractive index nl, the following relationship is established according to Snell's law.

nl-sin (Θ 1) = n2- sin (θ 2)

When nl <n2, θ Γ = 90 °, θ 2 'is called the critical angle. When a material with refractive index η2 is incident on a material with refractive index nl at an angle greater than the critical angle, the incident ray LB is totally reflected at the interface (light reflecting surface 29B). If the material with a refractive index nl is air (nl = l) and the material with a refractive index n2 (optical direction changing optical element 29) is PMMA resin (n2 = l. 49), the critical angle θ 2 θ or Θ 2 ' = 42. 16 °.

[0030] At the light incident side end of the light direction converting optical element 29, the surface emitting unit 3 is arranged in parallel in the width direction (direction perpendicular to the unit longitudinal direction), and in the unit body 5, There are provided flanges 29a (shown in FIG. 3) capable of pressing the side edges of 6 to the stepped portion 14. Positioning pins (not shown) that fit into the pin holes 6A and 6B of the circuit board 6 are provided on the light incident side end face of the light direction changing optical element 29. The light incident surface 29A, the light reflecting surface 29A, and the light emitting surface 29C of the light direction converting optical element 29 are subjected to a specular force. As the material of the optical element 29 for changing the light direction, in addition to PMMA resin, transparent resin materials such as polycarbonate and epoxy silicone, and transparent glass are used. In this case, the optical direction changing optical element 29 made of a transparent material is not limited, and a colored optical direction changing optical element may be used.

As shown in FIG. 8, the light incident surface 29A is composed of a first light incident surface 29b and a second light incident surface 29c, and an open end surface at one end of the optical element forming material (substantially cylindrical body). It is formed by providing a frustoconical recess 290 that gradually spreads in the direction toward the light incident side end face. The recess 290 is formed by a space having a size for accommodating the LED 28. As a result, there is a gap G (G ^ O. 3 mm between the first light incident surface 29b and the light extraction surface 28A of the LED 28. ) Is formed. In addition, light emitted from the side surface of the LED 28 is incident on the second light incident surface 29c. As a result, light incident on the second light incident surface 29c (for example, yellow light) is diffused, and color unevenness can be suppressed.

[0032] As shown in FIG. 8, the light reflecting surface 29B has a funnel-shaped recess 291 that gradually spreads toward the opening end surface (light extraction side) at the other end of the optical element forming material (substantially cylindrical body). It is formed by providing. The light reaching from the light incident surface 29A is totally reflected. The light reflecting surface 29B may be equivalently a part of a rotating quadratic surface, particularly a rotating paraboloid or rotating hyperboloid. In order to increase the reflection efficiency, the light reflecting surface 29B may be subjected to an electroless plating process such as nickel, which may be vapor-deposited with a metal film such as aluminum. A concave portion that opens to the opposite side of the LED 28 may be formed in the center of the light reflecting surface 29B. As a result, light is emitted from the central portion (concave portion) of the light reflecting surface 29B with a wide range of directivity angles.

[0033] The shape of the light reflecting surface 29B (funnel-shaped outer surface) is determined by, for example, the following optical simulation. First, as shown in FIG. 11, the axial dimension of the substantially cylindrical optical element forming material (P MMA resin) a (the axial dimension of the optical element for optical direction conversion 29) L is set, Set the outer diameter (maximum outer diameter of the light reflecting surface 29B) D of the imaginary circle centered on the point on the central axis O on one end face thereof. Next, the force on the other side of the optical element forming material a is also directed toward the one end surface, and the center axis O of the optical element forming material a is preliminarily placed on the virtual plane VI separated by the dimension LI (L> L 1). The light beam LB emitted from the LED placed above is totally reflected with the normal b and an angle ex greater than 42.16 ° (critical angle). In this case, when the reflection points of the light ray LB on the virtual plane VI are collected, these reflection points are arranged along the circumference of the outer diameter D l (D> D 1). These trials are repeated on an arbitrary virtual plane parallel to the one end face of the optical element forming material a, and all reflection points are collected. A light reflecting surface 29B is formed by a set of these reflection points.

As shown in FIG. 8, the light emission surface 29C is formed of a circumferential surface having a uniform outer diameter.

As described above, the light reflected by the light reflecting surface 29B is emitted obliquely forward, obliquely rearward, and laterally. Further, in order to increase the light emission efficiency, it is preferable to have a structure that does not easily cause internal reflection and bending and has a mirror surface. Light exit surface 29C is formed with a circumferential surface It may be formed on the side of the force polygonal prism (triangular prism, quadrangular prism, ...;) described for the case where it is applied. The light exit surface 29C may be subjected to a rough surface force to impart light diffusibility. Instead of performing this rough surface processing, even if a light diffusing agent is mixed in the optical direction conversion optical element 29, the light diffusibility can be improved.

As shown in FIGS. 3 and 8, the seal member 8 is interposed between the base 10 and the cover 11, and both side edges' edges are fitted into the concave grooves 13 of the base 10, and the whole is rubber. It is formed by packing made of metal. As described above, the arrangement space 5A of the unit body 5 is sealed. The seal member 8 is provided with a plurality of (four in this embodiment) element insertion holes 8A, 8A,... For inserting the light direction changing optical elements 29 of the light-emitting lamps 7, 7,. . These element through-holes 8A, 8A,... Are press-fitted between the outer peripheral surface (light emitting surface 29C) of the light direction converting optical element 29 and the inner surfaces of the openings 11A, 11A,. An annular seal portion 8B is provided on the body. The first cable through hole 8C, 8C forces the cable 24, 24 into the end of the seal member 8 in the longitudinal direction, and the cables 26, 26 are pressed into the other end in the longitudinal direction. The second cable insertion holes 8D and 8D that are inserted in the state are provided.

[0036] (Configuration of Light Diffusing Member 4)

As shown in FIG. 1, the light diffusing member 4 is disposed on the light extraction side of the surface emitting units 3, 3,... And is mounted on the opening of the case 2 and is made of a resin material mixed with a light diffusing agent. It is formed of a milky white thin plate member. Then, the light emitted from the surface emitting units 3, 3,... And the light reflected by the rear plate 2C (unit mounting surface 2c) and side plates 2A, 2B (light reflecting portions 2a, 2b) of the case 2 are used. In addition, the mixed light is diffused and transmitted. The distance between the light diffusing member 4 and the surface emitting units 3, 3,... Is set to about 20 mm, for example.

FIGS. 12 (a) to 12 (c) show the positional relationship between the light direction changing optical element 29 and the LED 28, and FIG.

2 (d) is a diagram showing a state of light emission inside the LED 28. FIG.

[0038] As shown in Fig. 12 (a), when the LED 28 is arranged close enough to the light incident surface 29A side of the light direction changing optical element 29 so that there is almost no gap, Elementary The light incident on the child 29 is collected in the direction within the critical angle according to Snell's law, totally reflected by the light reflecting surface 29 B, directed sideways, emitted from the side light extraction surface 29C, and Diffused. Further, when an external force is applied to the upper portion of the light redirecting optical element 29, the LED 28 is also applied with a force and may be damaged.

[0039] As shown in FIG. 12 (b), when there is a gap between the LED 28 and the light incident surface 29A of the light direction changing optical element 29, the incident range is widened, so that all incident light is reflected. In order to irradiate the surface 29B, the diameter of the optical element 29 for changing the light direction becomes large. When the diameter is not increased, the light emitted from the LED 28 in a direction close to the horizontal (the light from the phosphor layer is long and becomes yellowish light) is emitted from the light extraction surface 29C of the light direction converting optical element 29. Totally reflected light, emitted from the light reflecting surface 29B, condensed yellow light on the central axis of the light redirecting optical element 29, and a surface light source is configured by arranging the light-emitting lamps 7 two-dimensionally There may be a yellow part.

[0040] As shown in FIG. 12 (c), when there is a recess 290 on the bottom surface of the light redirecting optical element 29 and there is a sufficient gap between the LED 28 and the light redirecting optical element 29, Even if an external force is applied to the upper part of the optical element 29 for changing the light direction, no force is applied to the LED 28 and it is not affected.

[0041] Since the LED 28 is sealed with a sealing resin 286 mixed with a phosphor 285 that emits yellow light by being excited by blue light emitted from the blue LED element 284, the LED 28 is emitted from the blue LED element 284. Since the passing distance differs depending on the direction in which the light passes through the sealing resin 286, the emitted light has different colors. That is, in FIG. 12 (d), the light ray traveling in the direction a becomes bluish light because the passing through the sealing resin 286 is thin. The light traveling in the b direction becomes yellowish light because the passing through the sealing resin 286 is thick. A concave portion 290 including a first light incident surface 29b and a second light incident surface 29c is formed so that a light incident surface is formed around the LED 28 on the light incident surface of the light redirecting optical element 29. The yellow light component close to is incident on the second light incident surface 29c, and the light extraction surface 29C force is also emitted and diffused to the surroundings, so that the yellow light is not condensed on the upper part of the light redirecting optical element 29. Can be.

[0042] When the gap between the LED 28 and the first light incident surface 29b is G and the diameter (or width) of the LED 28 is D, the diameter (or width) W of the first light incident surface 29b is D <W ( D <W <(D + 2G) or D <W (D + G) is more preferable.

[Operation of surface emitting device 1]

FIG. 13 is a cross-sectional view for explaining the operation of the surface light emitting device including the surface light emitting unit according to the first embodiment of the present invention.

As shown in FIG. 13, when the LEDs 28 of the surface light emitting units 3, 3,... Are first energized from a power source (not shown), white light is emitted from these LEDs 28.

Next, the white light emitted from the LED 28 is incident on the light incident surface 29 A of the light redirecting optical element 29 and reflected by the light reflecting surface 29 B, and the light reflected by the light reflecting surface 29 B is reflected on the light emitting surface. The light is emitted from 29C diagonally in the front-rear direction and the side. Further, some white light is not reflected by the light reflecting surface 29B, but is emitted forward from the light reflecting surface 29B (interface). These emitted lights are light directly incident on the light diffusing member 4 (shown in FIG. 1) along the optical axis, surface emitting units 3, 3,... (Light extraction side surface 11B of the cover 11), and the inner surface of the case 2 (back surface). The light is reflected on the unit mounting surface 2c of the face plate 2C and the light reflecting portions 2a and 2b) of the side plates 2A and 2B and is incident on the light diffusing member 4. In addition, the light emitted from the light direction changing optical element 29 includes light that is reflected even if it reaches the light diffusing member 4.

After the force, various white lights emitted from the light redirecting optical element 29 are mixed in the case 2, and light having an intensity corresponding to the degree of mixing is incident on the light diffusion member 4. The light is diffused and transmitted through the light diffusing member 4 to be emitted in a plane shape.

[Effect of the first embodiment]

According to the first embodiment described above, the following effects can be obtained.

(1) Since the surface light emitting units 3, 3,... Each include a plurality of light emitting lamps 7, 7,..., The plurality of LEDs 28 can be attached as a unit. As a result, even when the light emitting area (the scale of the apparatus) is large, the number of attachments can be reduced, and the attachment work can be simplified.

(2) The light is emitted from the light exit surface 29C of the light direction converting optical element 29 obliquely in the front-rear direction and the side, and a part thereof forward, and further, the emitted light is mixed. Since the surface emission of light is performed based on this, the variation in the amount of light emission and color unevenness as a single characteristic of the LED element is averaged, and the occurrence of light emission unevenness and color unevenness can be sufficiently suppressed. it can.

[0050] (3) Since the plurality of surface light emitting units 3, 3,... Are arranged in parallel in the vertical and horizontal directions, the number of the surface light emitting units 3, 3,. The dimensions can be changed. Thereby, it is possible to provide versatility without the need to change the design of the surface emitting units 3, 3,. In addition, since multiple surface emitting units 3, 3, ... are detachably arranged, the brightness of the lighting can be adjusted by increasing or decreasing the distance between the surface emitting units 3, 3, ... And versatility.

[0051] (4) Since the light direction changing optical element 29 does not have a sawtooth portion, the shape of the light direction changing optical element 29 is simplified, and the LED 28 of each surface emitting unit 3, 3,. Since each is covered with the light redirecting optical element 29, the amount of the optical element (lens) material used can be reduced, and thereby the manufacturing cost can be reduced.

[0052] (5) There is a gap G between the first light incident surface 29a of the light incident surface 29A and the light extraction surface 28A of the LED 28.

(G = 0.3 mm) is formed, so stress application due to pressure contact with the LED 28 on the circuit board 6 is avoided when the optical direction changing optical element 29 is assembled to the circuit board 6, and the LED 28 It is possible to prevent the occurrence of breakage and the occurrence of deviation of the joint portion.

[6] (6) Since the concave portion A for accommodating the LED 28 is provided at the light incident side end of the light direction converting optical element 29, the overall dimensions of the light emitting lamps 7, 7,. The surface emitting units 3, 3,.

[0054] [Second Embodiment]

FIG. 14 is an assembled perspective view showing the entire surface emitting unit according to the second embodiment of the present invention. FIG. 15 is a cross-sectional view for explaining a light emitting lamp of a surface emitting unit according to the second embodiment of the present invention. Fig. 15 (a) shows an AA cross section of Fig. 14, and Fig. 15 (b) shows an BB cross section of Fig. 14. FIG. 16 is a diagram for explaining a light direction changing unit in the light emitting lamp of the surface emitting unit according to the second embodiment of the present invention. 16 (a) is a perspective view, FIG. 16 (b) is a plan view, and FIG. 16 (c) is a bottom view. FIG. 17 is a cross-sectional view for explaining the light direction changing portion in the light-emitting lamp of the surface-emitting unit according to the second embodiment of the present invention. In Fig. 14 to Fig. 17, Fig. 1 to Fig. 8 In addition, the same reference numerals are given to the same or equivalent members * portions as in FIG. 13, and the detailed description is omitted.

As shown in FIG. 14, the surface emitting unit 101 shown in the second embodiment includes a long-sized unit main body 102 and a plurality of units arranged in parallel in the longitudinal direction on the unit main body 102. It is characterized in that it includes four (in this embodiment, four) light-emitting lamps 103, 103,.

[0056] Therefore, the unit main body 102 is formed of a plate member having a substantially C-shaped cross section that also has a metal material force such as aluminum having a recess 102A that fits into the light direction changing portion of each of the light-emitting lamps 103, 103,. And can be connected to other unit bodies. As a material of the unit main body 102, a resin material such as ABS resin is used in addition to a metal material. As shown in FIGS. 15 (a) and 15 (b), the unit body 102 has a plurality of light-emitting lamps 103, 103,... Holder pieces 104, 104,... (Only one is shown in FIG. 15) are provided. The holder pieces 104, 104,... Are provided with stepped portions 104A, 104A for holding a plurality of circuit boards 106 (described later) by bending both side edges thereof. The stepped portions 104A and 104A are each provided with two pin through holes (not shown) that open in the vertical direction. At both ends in the longitudinal direction of the unit main body 102, through holes 102B and 102B (shown in FIG. 14) for attaching the surface emitting unit 101 to the back plate 2C of the case 2 (both shown in FIG. 1) are provided. The single light-emitting lamp 103 and the single holder piece 104 constitute a light source module. A plurality of light emitting lamps 103 and a plurality of holder pieces 104 connected in series by a cable also constitute a light source module.

[0057] Since the light-emitting lamps 103, 103, ... have substantially the same configuration, only one light-emitting lamp 103 will be described. As shown in FIGS. 15 (a) and 15 (b), the light-emitting lamp 103 has the following structure. The LED 28 as a light emitting section that emits white light on the light extraction side, the light direction changing optical element 105 as a light direction changing section that emits the light emitted from the LED 28 and emits it to the side, and this light direction conversion Circuit board 106 interposed between the light incident side end surface of optical element 105 and stepped portion 104A, 104A of holder piece 104, and is mounted in recess 102A (shown in FIG. 14) of unit body 102 ing. As shown in FIGS. 15 (a), 15 (b) and FIGS. 16 (a) to (c), the optical element 105 for changing the light direction has a recess (fitting portion) 108 that fits into the holder piece 104. And a concave portion 109 that accommodates the LED 28, a light incident surface 29A for incident light emitted from the LED 28, a light reflecting surface 29B for reflecting light incident from the light incident surface 29 A, and the light reflecting surface 29B has a light exit surface 29C that emits the light reflected by 29B sideways and obliquely in the front-rear direction, and is disposed on the lamp mounting side of the unit body 102. It is made of a transparent material such as poly (methyl methacrylate) resin. When the light emitted from the LED 28 is incident on the light incident surface 29A, most of the light is refracted, the refracted light is totally reflected by the light reflecting surface 29B, and the light emitting surface 29C is also refracted to obliquely forward. Further, it is configured so as to be emitted from the light reflecting surface 29B (interface) in the obliquely rear-side direction.

[0059] As shown in FIGS. 16 (c) and 17, the optical direction changing optical element 105 includes first positioning pins 106A and 106A and second positioning pins 106B and 106B protruding from the light incident side surface. , 106B, 106B are provided. The first positioning pins 106A and 106A are positioned in the vicinity of the light incident surface 29A and are fitted into pin fitting holes (not shown) of the circuit board 106. The second positioning pins 106B, 106B, 106B, 106B are located at the four corners on the light incident side surface and are fitted into pin fitting holes (not shown) of the stepped portions 104A, 104A. In addition, the optical direction changing optical element 105 has a notch for passing through the cable 107 10 6C, 106C, 106C, 106C force For filling the grease communicating with these notches 106C, 106C, 106C, 106C 106D, 106D, 106D, 106D and board space 106E, 106E, 106E, 106E connected to each space 106D, 106D, 106D, 106D, respectively. .

[0060] As shown in FIGS. 15A and 15B, the circuit board 106 has a wiring pattern (not shown) electrically connected to the electrode terminal portion exposed on the back surface of the LED 28 of the light-emitting lamp 103. And is disposed in the recess 108 of the optical element 105 for changing the light direction. On the circuit board 106, as shown in FIG. 15 (b), an electronic component 110 made of a Zener diode is mounted. As a result, even when one of the light-emitting lamps 103, 103,... Stops lighting due to a failure or the like, the other light-emitting lamps 103, 103,. Circuit board 106, 106, ... Mutually adjacent to each other / / Two circuit boards adjacent to 106, 106ί Cape Nore 10 7 are connected in series.

[Effect of the second embodiment]

According to the second embodiment described above, the same effects as the effects (1) to (6) of the first embodiment can be obtained.

[0062] [Third Embodiment]

FIG. 18 is a cross-sectional view for explaining the light direction changing portion in the light emitting lamp of the surface light emitting unit according to the third embodiment of the present invention. The optical direction converting optical element of the third embodiment is inclined between the upper light reflecting surface 29B and the side light emitting surface 29C in the optical direction converting optical element 29 of the first embodiment. The light reflection surface 29D is provided.

[0063] The light that has also entered the second light incident surface 29c on the bottom surface of the light redirecting optical element 29 is reflected by the light reflecting surface 29B on the top surface and the light emitted from the LED 28 is reflected from the light emitting surface 29C on the side surface. Although it is emitted almost once, a part of the light reflected by the light reflecting surface 29B is reflected by providing a light reflecting surface 29D with a partially conical shape between the light reflecting surface 29B and the light emitting surface 29C. The light is reflected by the surface 29D and further diffused and reflected by the diffusing surface 29E consisting of fine irregularities on the bottom surface, and the light of the upper light reflecting surface 29B is also emitted. Note that the diffusing surface may be provided on the upper surface of the substrate 6 without providing the diffusing surface 29 E on the optical element 29 for changing light direction.

[0064] As a result, in the first embodiment, since the light is emitted from the entire side, the portion directly above the light source becomes dark when used for a surface light source having a particularly small thickness. By emitting light in the upward direction of the light source, a uniform surface light source can be obtained even in an ultra-thin case.

The surface light emitting unit (surface light emitting device) of the present invention has been described based on the above embodiment, but the present invention is not limited to the above embodiment and does not depart from the gist thereof. The present invention can be implemented in various modes within a range, and for example, the following modifications are possible.

[0066] (1) In each of the embodiments, the case where the longitudinal dimensions of the surface emitting units 3, 3, ... are all the same has been described. However, the present invention is not limited to this, and the longitudinal dimensions are By preparing different types of surface emitting units and connecting these types of surface emitting units in appropriate combinations, surface emitting devices with various external shapes such as character signs can be created. Obtainable.

[0067] (2) In each of the embodiments, the case where the light emission amount of the LED 28 is always constant has been described. However, the present invention is not limited to this. For example, the light emission amount is controlled according to the ambient brightness. May be.

(3) In each of the embodiments, the case where a single LED 28 is accommodated in the concave portion 290 of the light direction changing optical element 29 has been described. However, the present invention is not limited to this, and a plurality of LED elements are included. May be accommodated. In this case, by arranging a plurality of LED elements at predetermined positions and simultaneously or sequentially controlling the amount of light emitted from these LED elements, a pseudo light emitting device such as a candle or a rotating lamp can be configured. A staging effect can be obtained

[0069] (4) In each embodiment, when a blue LED element that emits blue light and a yellow phosphor that emits yellow light when excited by the blue light emitted from the blue LED element are combined, white light is obtained. However, the present invention is not limited to this, and an LED element that emits ultraviolet light and an R (red) light, a G (green) light, and a B (blue) light excited by the ultraviolet light emitted by the LED element. White light can be obtained by combining R phosphor, G phosphor, and B phosphor

[0070] (5) In each embodiment, the case where white light is obtained using an LED element and a phosphor has been described. However, the present invention is not limited to this, and for example, a blue LED element without using a phosphor is used. White light can be obtained by mixing the blue light emitted and the yellow light emitted by the yellow LED element. Further, white light or other color light can be obtained by mixing the blue light emitted from the blue LED element, the green light emitted from the green LED element, and the red light emitted from the red LED element. Further, not only white light but also monochromatic light such as red, green, and blue may be used.

(6) In each embodiment, a blue LED element that emits blue light and a yellow phosphor that emits yellow light when excited by the blue light emitted from the blue LED element are sealed with a package to obtain white light. However, the present invention is not limited to this, and only the blue LED element is sealed with the package, and the yellow phosphor is disposed on the light incident surface side of the light diffusing member 4 to obtain white light. Can be obtained. (7) In each embodiment, the case where the surface light emitting units 3, 3,... Are of the same type has been described. However, the present invention is not limited to this, and the light emitting lamp emits within each surface light emitting unit. Multiple types of surface emitting units with different colors and number of positions

(8) In each embodiment, the case where the electrical connection of the light emitting lamps 7, 7,... And the light emitting lamps 103, 103,... Is in series has been described, but the present invention is not limited to this. Of course, it may be parallel.

(9) In each of the embodiments, the case where light emitted from the surface light emitting units 3, 3,... Is extracted in one direction has been described, but the present invention is not limited to this, and the light is extracted in a plurality of directions. There is no problem.

(10) In each embodiment, a plurality of surface emitting units 3, 3,... (Or 101, 101,...) Are arranged in parallel in the vertical and horizontal directions within the same plane, .. (Or 103, 103,...) Are arranged in parallel in the lateral direction of the unit, and a plurality of surface emitting units 3, 3,... (Or 101, 101,...) Of the two surface emitting units 3, 3, ... (or 101, 101, ...) that are adjacent to each other in the vertical direction, the case where they are arranged at the square apex (position shown in Fig. 1) has been described. The invention is not limited to this, and a plurality of surface emitting units are arranged in parallel in the vertical and horizontal directions in the same plane, a plurality of light emitting lamps are arranged in parallel in the unit horizontal direction, and a plurality of surface emitting units are arranged. Of these, two surface light emitting units adjacent to each other in the vertical direction may be arranged in a staggered manner. In addition, a plurality of surface emitting units are arranged in parallel in the vertical and horizontal directions within the same curved surface, a plurality of light emitting lamps are arranged in parallel in the unit horizontal direction, and among the plurality of surface emitting units, they are mutually in the vertical direction. Two adjacent surface emitting units may be arranged at a square apex or in a staggered manner.

(11) In each embodiment, the LED 28 may be only a force LED element using a structure in which the LED element 284 is sealed with the sealing resin 286.

Industrial applicability

[0077] The light source module, the surface light emitting unit, and the surface light emitting device according to the present invention are useful for displaying a video signboard, lighting for a store, and the like.

Brief Description of Drawings FIG. 1 is a perspective view showing an entire surface light emitting device including a surface light emitting unit according to a first embodiment of the present invention.

FIG. 2 is an assembled perspective view showing the entire surface emitting unit according to the first embodiment of the present invention.

FIG. 3 is an exploded perspective view showing the entire surface emitting unit according to the first embodiment of the present invention.

FIG. 4 is a perspective view showing a connection state of the surface emitting unit according to the first embodiment of the present invention.

FIG. 5 is a perspective view showing a state where the connection of the surface emitting unit according to the first embodiment of the present invention is released.

FIG. 6 is a perspective view showing a state in which the connecting portion of the surface emitting unit according to the first embodiment of the present invention is viewed on one side.

FIG. 7 is a perspective view showing a state in which the connecting portion of the surface emitting unit according to the first embodiment of the present invention is viewed on the other side.

FIG. 8 is a cross-sectional view showing a main part of the surface emitting unit according to the first embodiment of the present invention.

FIG. 9 is a cross-sectional view of the LED according to the first embodiment of the present invention.

FIG. 10 is a view for explaining total reflection on a light reflecting surface of a light direction conversion section in the light emitting lamp of the surface emitting unit according to the first embodiment of the present invention.

FIG. 11 is a cross-sectional view for explaining the shape of the light direction conversion portion in the light emitting lamp of the surface light emitting unit according to the first embodiment of the present invention.

[FIG. 12] (a) to (c) show the positional relationship between the light direction changer and the LED, and (d) shows the state of light emission inside the LED.

FIG. 13 is a cross-sectional view shown for explaining the operation of the surface light emitting device including the surface light emitting unit according to the first embodiment of the present invention.

FIG. 14 is an assembled perspective view showing the entire surface emitting unit according to the second embodiment of the present invention.

[FIG. 15] (a) and (b) are cross-sectional views illustrating a light-emitting lamp of a surface light-emitting unit according to a second embodiment of the present invention.

[FIG. 16] (a) to (c) are a perspective view, a plan view, and a bottom view for explaining a light direction changing portion in a light-emitting lamp of a surface-emitting unit according to a second embodiment of the present invention.

FIG. 17 is a cross-sectional view for explaining a light direction conversion section in a light emitting lamp of a surface emitting unit according to a second embodiment of the present invention. FIG. 18 is a cross-sectional view for explaining a light direction conversion section in a light emitting lamp of a surface emitting unit according to a third embodiment of the present invention.

Explanation of symbols

1 ... Surface emitting device, 2 ... Case, 2A, 2B ... Side plate, 2a, 2b ... Light reflector, 2C ... Back plate, 2c ... Unit mounting surface, 3, 101 ... Surface emitting unit, 4 ... Light diffusing member, 5, 102 ··· The main body of the pipe, 5 配置 ··· Placement space, 6, 106 · "Circuit board, 6A, 6Β ··· Pin hole, 7, 103 ··· Light emitting lamp, ··· Sealing member 8A ... Element through hole, 8B ... Seal part, 8C ... First cable through hole, 8D ... Second cable through hole, 10 "Base, 10A, 10B ... Frame, 11 ... 11 A ... Opening part, 11B ... Light extraction surface, 12 ... Mounting piece, 13 ... Dove groove, 14 ... Stepped part, 15, 16, 17, 18, 21, 22, 106C ... Notch, 19 ... Mating protrusion, 19A ... Reinforcement part, 20 ... Mating space, 24, 26, 107 ··· Cable, 28 --- LED, 29, 105 ··· Optical element for changing light direction, 29Α ··· Light Incident surface, 29a ... Head, 29b ... First light incident surface, 29c ... Second light incident surface, 29B ... Light reflecting surface, 29C ... Light emitting surface, 29D ... Light reflecting surface, 29拡散 ... Diffusion surface, 102A ... Recess, 102B ... Through hole, 104 ... Holder piece, 104A ... Stepped part, 106A ... First positioning pin, 106B ... Second positioning pin, 106D ... Fabric Space for filling, 106E ... Space for board connection, 108, 109, 290, 291 ... Recess, 110 ... Electronic component, G ... Gap, LB ... Light, Ο ... Center axis, VI ··· Virtual surface, a ... Optical element forming material, b ... Normal, 281 ... Recess, 281a ... Inclined slope, 281b ... Bottom, 282 ... Knockage, 283A, 283Β ... Lead, 284 ... · Blue LED element, 285 · Phosphor, 286… Encapsulated resin

Claims

The scope of the claims

[1] Light having a recess having a light incident surface on which light is incident, a light reflecting surface that reflects light incident from the light incident surface, and a light emitting surface that emits light reflected by the light reflecting surface to the side A direction changer;

A light source module, comprising: a light emitting portion that is disposed with a gap in the concave portion of the light direction changing portion and that makes the light incident on the light incident surface.

[2] Furthermore, a unit main body having an arrangement space and a circuit board arranged in the arrangement space are provided.

The light source module according to claim 1, wherein the light emitting unit is mounted on a circuit board.

[3] The light source module according to claim 2, further comprising a cable for connecting the light emitting units of the plurality of unit main bodies in series.

4. The unit main body has a base that holds the light-emitting lamp, and a cover that has an opening that passes through the light direction changing portion and that forms the arrangement space together with the base. The light source module according to 1.

[5] The unit body includes a holder piece for holding the light emitting lamp,

3. The light source module according to claim 2, wherein the light direction changing part has a fitting part fitted to the holder piece.

[6] The light direction changing unit further includes a second light reflecting surface that emits the light reflected by the light reflecting surface downward, and a diffusion surface that diffuses the light reflected by the second light reflecting surface. The light source module according to claim 1 having the following.

[7] When the diameter of the light emitting portion is D and the gap between the light emitting portion and the bottom surface of the concave portion is G, the diameter W of the bottom surface of the concave portion is expressed as D <W <(D + 2G). 2. The light source module according to claim 1, wherein the light source module is satisfied.

[8] The light emitting unit includes a bottom surface and a package having a concave portion having an inclined surface force, an LED element disposed on the bottom surface of the concave portion of the package and emitting a first color light, and the LE

2. The light source according to claim 1, further comprising: a phosphor disposed around a D element and converting a part of the first color light emitted from the LED element into a second color light and outputting the second color light. Mo Jules.

[9] A unit body that has an arrangement space and can be connected to another unit body;

A plurality of light-emitting lamps arranged in the arrangement space of the unit main body and having at least one light emitting unit that emits light and a light direction converting unit that emits light emitted from the at least one light emitting unit and emits the light laterally. And a surface emitting unit characterized by comprising:

[10] The unit body has a single circuit board arranged in the arrangement space,

The surface emitting unit according to claim 9, wherein the plurality of light emitting lamps are mounted on the single circuit board.

11. The surface emitting unit according to claim 9, wherein the unit main body is formed of a light reflecting surface whose light extraction side surface reflects light emitted from the light emitting lamp.

[12] The unit main body includes a base that holds the plurality of light-emitting lamps, and a cover that has an opening that penetrates the light direction changing portion and forms the arrangement space together with the base. The surface emitting unit according to the item 9 of the range.

13. The surface emitting unit according to claim 9, wherein the arrangement space of the unit body is sealed with a seal member.

14. The surface emitting unit according to claim 9, wherein the unit body has a recess that fits into the light direction changing portion.

15. The surface emitting unit according to claim 9, wherein two light emitting units adjacent to each other among the light emitting units of the plurality of light emitting lamps are connected by a cable.

16. The surface light emitting unit according to claim 9, wherein the light emitting section of the plurality of light emitting lamps is formed of a light emitting diode.

[17] The light direction changing unit of the plurality of light emitting lamps includes a light incident surface on which light emitted from the light emitting unit is incident, a light reflecting surface that reflects light incident from the light incident surface, 10. The surface emitting unit according to claim 9, further comprising a light emitting surface that emits the light reflected by the light reflecting surface to the side.

18. The surface light emitting unit according to claim 9, wherein a gap is provided between the light direction changing portions of the plurality of light emitting lamps and the light emitting portion.

[19] The plurality of light-direction changing units have a recess for accommodating the light-emitting unit. The surface emitting unit according to item 9.

[20] a plurality of surface emitting units;

A light diffusing member disposed on a light extraction side of the plurality of surface light emitting units, and the plurality of surface light emitting units include:

A unit body that has an arrangement space and can be connected to another unit body;

A plurality of light-emitting lamps arranged in the arrangement space of the unit main body and having at least one light emitting part that emits light and a light direction converting part that emits light emitted from the at least one light emitting part and emits the light laterally. A surface light-emitting device comprising:

[21] The plurality of surface light emitting units are arranged in parallel in the vertical and horizontal directions within the same plane or curved surface,

The plurality of light-emitting lamps are arranged in parallel in the lateral direction of the unit, and are arranged at a square apex or in a staggered manner in two surface light-emitting units adjacent to each other in the vertical direction among the plurality of surface light-emitting units. 21. The surface light emitting device according to claim 20, wherein

22. The surface light emitting device according to claim 20, wherein the plurality of surface light emitting units are arranged in parallel so as to be detachable in the vertical and horizontal directions within the same plane or curved surface.