JP2008159394A - Mounting unit and planar light emitting device - Google Patents

Abstract

Provided are a mounting unit and a planar light emitting device that can easily mount a light source, can arbitrarily change a light emitting area, and can sufficiently suppress the occurrence of uneven light emission.
The planar light emitting device 10 includes a plurality of light source modules 12, a plurality of attachment members 110 having a plurality of fitted portions 112 into which the light source modules 12 are detachably fitted, and two-dimensionally. And a mounting unit 11 having a plurality of connecting portions 113 that detachably connect the plurality of mounting members 110 arranged in a shape for each light source module 12, and the light source module 12 is mounted on the circuit board. And a light redirecting element 120 that emits light from the LED to the bottom surface and exits to the side.
[Selection] Figure 4

Description

  The present invention relates to an attachment unit to which a light source module is attached, and a planar light emitting device using the attachment unit.

  Conventionally, LED light power is increased, energy saving, and clean light sources that do not contain environmentally hazardous substances. Light sources such as signboards, backlights for liquid crystal televisions, and lighting devices that have been illuminated with light sources such as light bulbs and fluorescent lamps. It has been replaced by an LED. In addition, since a small LED can be used, the degree of freedom in design increases, and a large and thin planar light source is required in the market. By thinning, the existing surface light source is space-saving and can be installed in places where it could not be installed.

As a conventional planar light emitting device applied to such an illumination device, for example, a wiring board, a plurality of LEDs arranged in parallel on the element mounting surface of the wiring board, and light emitted from these LEDs are illuminated. The thing provided with the light guide member with the spreading | diffusion part for guide | inducing to an object is proposed (patent document 1). According to this configuration, it is possible to make the illuminance uniform even if the individual LED elements have variations in light emission characteristics.
JP 2004-14365 A

  However, according to the conventional planar light emitting device, 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.

  Accordingly, an object of the present invention is to provide a mounting unit and a planar light emitting device that can easily mount a light source, can arbitrarily change the light emitting area, and can sufficiently suppress the occurrence of uneven light emission. It is in.

  In order to achieve the above object, the present invention provides a plurality of mounting members having a plurality of fitted portions into which a plurality of light source modules are detachably fitted, and the plurality of mounting members arranged one-dimensionally or two-dimensionally. There is provided a mounting unit comprising a plurality of connecting portions that detachably connect the mounting members of each light source module.

  In order to achieve the above object, the present invention provides a plurality of light source modules, a plurality of attachment members having a plurality of fitted portions into which the plurality of light source modules are detachably fitted, and one-dimensional or There is provided a planar light emitting device comprising a mounting unit having a plurality of connecting portions that detachably connect the plurality of mounting members arranged two-dimensionally for each light source module.

  According to the attachment unit and the planar light emitting device, the light source module can be attached to the attachment member by fitting, so that the light source module can be easily attached. Further, by separating the attachment member from the connecting portion and using a necessary number of attachment members, a light emitting area having a necessary size can be obtained. Further, when the light direction changing element is used, the light incident from the bottom surface of the light direction changing element is converted to the side and emitted, thereby expanding the irradiation range and suppressing the occurrence of uneven light emission.

  According to the present invention, the light source can be easily attached, the light emission area can be arbitrarily changed, and the occurrence of uneven light emission can be sufficiently suppressed.

  1A and 1B show an advertising billboard to which a planar light emitting device according to an embodiment of the present invention is applied. FIG. 1A is a front view, and FIG. 1B is a cross-sectional view taken along line AA in FIG.

  This advertising signboard 1 is attached to a substantially box-shaped casing 2 having an opening 2a, an advertisement display section 3 provided in the opening 2a, and a back plate 2b of the casing 2, and is attached to the advertisement display section 3 from the back side. And a planar light emitting device 10 that emits illumination light.

  The housing 2 includes a back plate 2b and four side plates 2c, and is made of a metal material or a resin material such as polycarbonate. The inner surface of the side plate 2c is made of aluminum in order to increase the light reflection efficiency. A metal sheet such as a sheet is attached. Instead of the metal sheet, white coating may be applied, and the housing 2 may be formed from a white resin material.

  The advertisement display unit 3 is made of, for example, a transparent plate 4 made of a transparent resin, transparent glass, or the like that protects the advertising plate 5, an advertisement board 5 on which an advertisement is printed, a transparent resin, transparent glass, or the like. A scattering plate 6 that has fine irregularities and scatters incident light is laminated. The scattering plate 6 may be a resin plate containing a scattering material.

  The planar light emitting device 10 includes an attachment unit 11 that is attached to the back plate 2b, a plurality of light source modules 12 that are detachably fitted to the attachment unit 11, and a reflection plate 13 that is disposed on the light source module 12. . The planar light emitting device 10 may be configured to further include the housing 2, the scattering plate 6, and the like.

  The reflection plate 13 reflects light emitted obliquely backward from the light source module 12 and light emitted from the light source module 12 and reflected by the advertisement display unit 3 to the advertisement display unit 3 side. As such a reflecting plate 13, for example, a material formed from a resin material such as ABS resin, and a surface painted on the advertisement display unit 3 side with a white coating as a reflecting surface can be used, but it is formed from a white resin material. May be.

  2 is a plan view of the planar light emitting device 10, FIG. 3 is a plan view showing a state in which the reflecting plate 13 is removed from the state of FIG. 2, and FIG. 4 is an exploded perspective view of the planar light emitting device 10.

  As shown in FIGS. 2 to 4, in the planar light emitting device 10, a plurality of light source units 12 are fitted to an attachment unit 11, and a reflecting plate 13 is attached thereon.

  The reflecting plate 13 has an opening 13a through which a light direction changing portion 121 (to be described later) of the light source module 12 is inserted, and a positioning hole 13b into which a positioning protrusion 117 (to be described later) of the mounting member 110 is fitted.

<Mounting unit>
As shown in FIGS. 3 and 4, the mounting unit 11 includes a plurality of (for example, 4 × 5) mounting members 110 having a thin plate rectangular shape (for example, 10 × 60 × 60 mm) arranged in a two-dimensional manner. The attachment members 110 are connected to each other so as to be separable from each other. The number of attachment members 110 is not limited to the above number, and the attachment members 110 may be arranged in a one-dimensional manner. The mounting member 110 includes an opening 111 for fixing the mounting unit 11 to the back plate 2b of the housing 2 with the screw 7, a fitted portion 112 into which the light source module 12 is detachably fitted, and a mounting member. 110 is provided with a connecting portion 113 that connects the 110 to each other in a separable manner. Such an attachment member 110 is integrally formed from, for example, a resin material such as ABS resin. When fixing the mounting unit 11 to the back plate 2b of the housing 2 with the screws 7, all the mounting members 110 may be fixed, or only the mounting members 11 located at the four corners may be fixed. The attachment member 11 may be fixed.

(Mounting member)
5 is a plan view of one set of mounting member 110 and the light source module 12, FIG. 6A is a perspective view of the mounting member 110, and FIG. 6B is a cross-sectional view taken along line FF in FIG. 7 is a BB cross-sectional view of FIG. 5, and FIG. 8 is a CC cross-sectional view of FIG.

  As described above, the mounting member 110 includes the opening 111, the fitted portion 112, and the connecting portion 113, and further fits into the locking portion 114 where the cable 14 is locked and the positioning hole 13 b of the reflector 13. And a positioning projection 117 for positioning the reflecting plate 13.

  As shown in FIG. 6, the mounting members 110 other than the horizontal row on the upper end side and the vertical row on the left end side of the mounting unit 11 are provided with insertion recesses 115 on four side surfaces, respectively. As shown in FIGS. 3 and 6, as shown in FIGS. 3 and 6, the mounting unit 11 is inserted into the insertion recess 115 on the side surface of the mounting member 110 located in the horizontal row on the upper end side and the vertical row on the left end side. The insertion protrusion 116 protrudes upward or leftward. Accordingly, the mounting unit 11 located at the upper left end is provided with the protrusions 116 protruding upward and leftward. Thereby, by inserting the insertion convex portion 116 of the mounting unit 11 into the insertion concave portion 115 of the other mounting unit 11, the light emitting area can be increased by combining the plurality of mounting units 11.

  In addition, the attachment member 110 forms thin cable storage portions 118A to 118D for storing the cable 14, and the cable 14 does not protrude from the surface of the attachment member 110 when the cable 14 is stored in the cable storage portions 118A to 118D. I have to.

(Separation structure of mounting members)
As shown in FIG. 6B, the connecting portion 113 is formed with V grooves 113a on the front surface and the back surface, respectively, and the minimum thickness between the V grooves 113a is 0.5 to 2 mm, preferably 1 to 1.5 mm. The attachment member 110 can be easily separated.

(Light source module fitting structure)
The to-be-fitted part 112 is comprised from the recessed part 112a which has a shape corresponding to the fitting part of the light source module 12, and several (for example, four) locking pieces 112b formed in the outer side so that elastic deformation is possible. .

  When the light source module 12 is pushed into the concave portion 112a, the convex portion 122g shown in FIG. 7 provided in the light source module 12 elastically deforms the locking piece 112b outward. When the light source module 12 comes into contact with the bottom surface of the recess 112a, the deformation of the locking piece 112b is restored, the locking piece 112b is locked to the upper surface of the convex portion 122g, and the light source module 12 is attached to the fitted portion 12. . When removing the light source module 12 from the mounting member 110 for replacement of the light source module 12 or the like, the light source module 12 can be removed by spreading the locking piece 112b outward with a flathead screwdriver or the like and lifting the light source module 12. .

(Cable locking structure)
As shown in FIG. 8, the cable locking portion 114 is formed with an inclined surface 119a in the peripheral portion 119 around the concave portion 112a into which the light source module 12 is fitted, and the inclined surface 114a so as to face the inclined surface 119a. Is provided with a cable holding piece 114b. When the cable 14 in which the conductor 14a is covered with the covering member 14b is pushed into the inclined surfaces 119a and 114a,
The cable holding piece 114b is elastically deformed to accommodate the cable 14 between the peripheral portion 119 of the recess and the cable holding piece 114b, the cable holding piece 114b returns to the original position, and the cable 14 is engaged with the cable locking portion 114. Stopped.

<Light source module>
9A is a cross-sectional view taken along the line DD in FIG. 5, FIG. 9B is a cross-sectional view taken along the line EE in FIG. 5, FIG. 10 shows the light redirecting element, and FIG. (B) is a plan view, (c) is a bottom view, and FIG. 11 is a longitudinal sectional view of the light direction changing element.

  The light source module 12 includes a light direction conversion element 120, a holder piece 123 fitted to the light direction conversion element 120, and a circuit board 124 mounted on the holder piece 123 and having the LED 20 mounted thereon.

(Light direction change element)
The light direction changing element 120 includes a light direction changing portion 121 and a case portion 122, and is integrally formed of, for example, a PMMA (polymethyl methacrylate) resin. The light redirecting element 120 may be formed of a transparent resin such as polycarbonate and epoxy / silicone, transparent glass, or a colored material.

  As shown in FIGS. 9A and 9B and FIGS. 10A to 10C, the case 122 of the light redirecting element 120 includes a recess 122a into which the holder piece 123 is fitted, and the holder piece 123 side. Two first positioning pins 122b and four second positioning pins 122c projecting to each other, a notch 122d through which the cable 14 is inserted, a resin-filled space portion 122e communicating with the notch 122d, and each space portion A board connecting space 122f communicating with 122e and a plurality (for example, four) of convex parts 122g that are locked to the locking pieces 112b of the mounting member 110 are provided. The space 122e is sealed by being filled with resin after assembling the light redirecting element 120, the circuit board 124, and the holder piece 123.

  The first positioning pin 122b is positioned in the vicinity of a recess 121a described later, and is fitted into a pin fitting hole (not shown) of the circuit board 124. The second positioning pins 122 c are located at the four corners on the back surface of the case portion 122 and are fitted into pin fitting holes (not shown) of the stepped portion 123 a of the holder piece 123.

The light direction changing portion 121 of the light direction changing element 120 is formed with a recess 121 a that houses the LED 20. The concave portion 121a includes a first light incident surface (bottom surface) 121 _b1 on which light emitted from the LED 20 is incident and a second light incident surface (bottom surface) 121 _b2 . Further, the light direction changing part 121 includes a light reflecting surface 121c that totally reflects the incident light from the first light incident surface 121 _b1, totally reflected laterally by refracting light at the light reflecting surface 121c, diagonally forward and A light exit surface 121d that exits obliquely rearward. The light incident surface 121b, the light reflecting surface 121c, and the light emitting surface 121d are mirror-finished.

A gap G (G≈0.3 mm) is formed between the first light incident surface 121 _{b 1} and the LED 20. Thereby, even if an external force is applied to the light redirecting element 120, no force is applied to the LED 20, and the LED 20 can be prevented from being damaged. In addition, light emitted from the side surface of the LED 20 is incident on the second light incident surface 121 _b2 . Thereby, the light (for example, yellow light) which _injects into the 2nd light-incidence surface _121b2 is spread | diffused, and color unevenness can be suppressed.

As shown in FIG. 11, the light reflecting surface 121c is formed in a funnel shape that gradually spreads toward the light emitting surface 12d of a substantially cylindrical body so as to totally reflect the light reaching the first light incident surface _121b1. Yes. The light reflecting surface 121c may be equivalently a part of a rotating quadratic surface, particularly a rotating paraboloid or rotating hyperboloid. Further, a metal film such as aluminum may be formed on the light reflecting surface 121c in order to increase the reflection efficiency. Further, part of light may be transmitted through the light reflecting surface 121c.

  As shown in FIG. 8, the light exit surface 121d is configured by a circumferential surface having a uniform outer diameter. In addition, you may form the light-projection surface 121d by the side surface of a polygonal column (a triangular prism, a quadrangular column, ...). In addition, the light exit surface 121d may be roughened to have light diffusibility. The light diffusibility can be improved even if a light diffusing agent is mixed in the light redirecting element 120 instead of the rough surface processing.

(Holder piece)
The holder piece 123 is provided with a stepped portion 123 a that holds the circuit board 124. The stepped portion 123a is provided with two pin insertion holes (not shown) opened in the vertical direction through which the second positioning pins 122c of the light direction changing element 120 shown in FIG. 10 are inserted. After holding the circuit board 124 on the stepped portion 123a, the holder piece 123 is inserted into the pin insertion hole through the second positioning pin 122c of the light direction changing element 120, and then the light direction changing element by an adhesive, welding, or the like. 120 is fixed.

(Circuit board)
As shown in FIGS. 9A and 9B, the circuit board 124 has a wiring pattern (not shown) electrically connected to the lead exposed on the back surface of the LED 20, as shown in FIG. 9B. As described above, an electronic component 125 such as a Zener diode is mounted and connected to another circuit board 124 or a power source by the cable 14. The circuit board 124 is provided with two pin insertion holes (not shown) through which the first positioning pins 122b of the light direction changing element 120 are inserted.

(LED)
FIG. 12 is a cross-sectional view of the LED 20. The LED 20 is formed of a white resin material, and includes a package 22 having a concave portion 21 formed of an inclined surface 21a and a bottom surface 21b serving as a reflector, and a pair of leads 23A and 23B led out from the bottom surface 21b of the concave portion 21; A blue LED element 24 that emits blue light that is electrically connected to the ends of the pair of leads 23A and 23B on the concave portion 21 side, and a yellow light that is filled in the concave portion 21 and excited by the blue light emitted from the blue LED element 24. And a sealing resin 26 containing a phosphor 25 that emits light and is mounted on a circuit board 124 by leads 23A and 23B, and is based on a mixture of blue light emitted from the blue LED element 24 and yellow light emitted from the phosphor 25. It is configured to emit white light.

  As the blue LED element 24, for example, an LED element made of a GaN-based semiconductor compound having an emission wavelength region of 450 nm to 460 nm can be used. As the phosphor 25, for example, a silicate phosphor or a garnet phosphor such as a YAG (Yttrium Aluminum Garnet) phosphor can be used.

  FIGS. 13A and 13B show circuit examples of the planar light emitting device 10, respectively. In the circuit example shown in FIG. 13A, all the circuits constituting the mounting unit 11 are configured by connecting the zener diode ZD in parallel to the blue LED element 24 indicated by L in the same figure, with the polarity reversed from that of the blue LED element 24. The board 124 is connected in series by the cable 14, the constant current power supply 15 </ b> A is connected to the input terminal 124 a of the first circuit board 124, and the output terminal 124 b of the last circuit board 124 is short-circuited. According to this configuration, by using a Zener diode that operates at a voltage slightly higher than the forward voltage (Vf) of the blue LED element 24, even if any of the blue LED elements 24 has an open failure, the corresponding Zener diode Is supplied with current, and the other blue LED elements 24 are also supplied with current and can be lit.

  In the circuit example shown in FIG. 13B, the cathode of the blue LED element 24 indicated by L in the figure is connected to one end of resistors R1 and R2 connected in parallel, and the anode of the blue LED element 24 and the resistors R1 and R2 are connected. All the circuit boards 124 constituting the mounting unit 11 are connected in series by the cable 14 so that a voltage is supplied to the other end of the circuit, and the DC power supply 15B is connected to the input terminal 124a of the first circuit board 124. The output terminal 124b of the tail circuit board 124 is opened. According to this configuration, even if one of the blue LED elements 24 fails to open, a voltage can be applied to the other blue LED elements 24 to light them.

(Operation of advertising billboard)
FIG. 14 shows light rays emitted from the light source module 12, (a) shows the light rays whose direction has been changed by the light direction changing element 120, and (b) shows the light rays inside the advertising billboard 1.

  When power is supplied to the planar light emitting device 10, white light is emitted from the LEDs 20 of each light source module 12, and the white light is laterally and obliquely upward by the light direction conversion element 120 as shown in FIG. The light is converted obliquely downward and emitted. As shown in FIG. 14B, the light a emitted from the light source module 12 reaches the advertisement display unit 3 directly, and the light b emitted diagonally forward or sideward. Is reflected by the inner surface of the side plate 2 c of the housing 2 and reaches the advertisement display unit 3. Further, the light c emitted obliquely rearward is reflected by the reflecting plate 13 and reaches the advertisement display unit 3 to display the advertisement content of the advertisement board 5.

(Change of light emitting area)
FIG. 15 is a plan view for explaining a method of changing the light emitting area. The figure shows a case where a total of 99 attachment members (blocks) 110 of 11 horizontal and 9 vertical are combined. In this case, four attachment units (seats) 11 are combined. First, as shown in FIG. 6A, the insertion convex portion 116 of the mounting unit 11 positioned at the upper right is inserted into the insertion concave portion 115 of the mounting unit 11 positioned at the upper left, and the mounting unit 11 positioned at the upper left. The insertion convex portion 116 of the mounting unit 11 located at the lower left is inserted into the insertion concave portion 115, and the insertion convex portion of the mounting unit 11 located at the lower right is inserted into the insertion concave portion 115 of the mounting unit 11 located at the lower left and upper right. 116 is inserted. After the four mounting units 11 are combined, the ten mounting members 110 on the upper end side are separated from the other mounting units 11, and the insertion convex portions 116 of the upper right and upper left mounting units 11 are inserted into the insertion concave portions 115. The left eight mounting members 110 are separated from the other mounting units 11, and the insertion protrusions 116 of the upper left and lower left mounting units 11 are inserted into the insertion recesses 115. The combination of the mounting units shown in FIG. 15 is completed by separating the mounting unit 11 and inserting the insertion protrusions 116 of the combined mounting member 110 into the insertion recesses 115.

<Effect of planar light-emitting device of this embodiment>
According to the planar light-emitting device 10 of this Embodiment, there exist the following effects.
(A) Since the light source module 12 can be detachably attached to the fitted portion 112 of the attachment member 110, the attaching operation of the light source module 12 becomes easy. Further, since the cable 14 can be easily attached to the locking portion 114, the attaching operation of the cable 14 is facilitated. As a result, the assembly work of the sheet issuing device 10 becomes easy.
(B) By inserting the insertion protrusions 116 into the insertion recesses 115 and using the required number of attachment units 11, or by separating the attachment members 110 from the connecting portions 113 and using the required number of attachment members 110, The light emitting area can be arbitrarily changed.
(C) Since the light incident on the light incident surface 121b of the light direction changing element 120 is converted to the side, obliquely forward, and obliquely rearward and emitted, the range irradiated by one LED 20 is expanded. Generation | occurrence | production can fully be suppressed.

  The present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit of the invention.

  For example, in the above embodiment, the case where the planar light emitting device is applied to an advertising billboard as a backlight has been described. However, the present invention can also be applied to a liquid crystal television or the like, and the planar light emitting device itself can be used according to an image signal. The light source module may be turned on or off to display an image.

  A plurality of LED elements may be incorporated in the light source module. In this case, color light emission can be obtained by incorporating LED elements of three colors of R, G, and B.

The advertising billboard which applied the planar light-emitting device concerning an embodiment of the invention is shown, (a) is a front view and (b) is an AA sectional view of (a). The top view of a planar light-emitting device. The top view which shows the state which removed the reflecting plate from the state of FIG. The disassembled perspective view of a planar light-emitting device. The top view of one set of attachment members and a light source module. (A) is a perspective view of an attachment member, (b) is FF sectional drawing of (a). BB sectional drawing of FIG. CC sectional drawing of FIG. (A) is DD sectional drawing of FIG. 5, (b) is EE sectional drawing of FIG. The light direction change element is shown, (a) is a perspective view, (b) is a plan view, and (c) is a bottom view. Sectional drawing of a light direction change element. Sectional drawing of LED. (A), (b) is a figure which shows the circuit example of a planar light-emitting device, respectively. (A) is a figure which shows the mode of the emitted light of a light direction change element, (b) is a figure which shows the state of the emitted light of a planar light-emitting device. The top view which shows the example of a combination of an attachment unit.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Advertisement billboard 2 Case 2a Opening 2b Back plate 2c Side plate 3 Advertisement display part 4 Transparent plate 5 Advertisement plate 6 Scatter plate 7 Screw 10 Planar light-emitting device 11 Mounting unit 12 Light source module 13 Reflecting plate 13a Opening 13b Positioning hole 14 Cable 14a Conductor 14b Coating member 15A Constant current power supply 15B DC power supply 20 LED
21 Recessed portion 21a Inclined surface 21b Bottom surface 22 Package 23A, 23B Lead 24 Blue LED element 25 Phosphor 26 Sealing resin 110 Mounting member 111 Opening 112 Fit portion 112a Recessed portion 112b Locking piece 113 Connection portion 113a V groove 114 Locking portion 114a Inclined surface 114b Cable holding piece 115 Insertion concave part 116 Insertion convex part 117 Positioning convex part 118A-118D Cable accommodating part 119 Concave peripheral part 119a Inclined surface 120 Light direction conversion element 121 Light direction conversion part 121a Concave part 121b Light incident surface 121 _b1 first light incident surface 121 _b2 second light incident surface 121c light reflecting surface 121d light emitting surface 122 case portion 122a concave portion 122b first positioning pin 122c second positioning pin 122d notch 122e space portion 122f space portion 122g convex portion 123 Holder 123a stepped portion 124 circuit board 124a input terminal 124b output terminal 125 electronic component

Claims (9)

A plurality of attachment members having a plurality of fitted portions into which a plurality of light source modules are detachably fitted;
A mounting unit comprising: a plurality of connecting portions that connect the plurality of mounting members arranged one-dimensionally or two-dimensionally so as to be separable for each light source module. The plurality of attachment members and the plurality of connecting portions are made of a resin material,
The mounting unit according to claim 1, wherein the plurality of connecting portions are formed to a thickness of 1 to 1.5 mm.   The mounting unit according to claim 1, wherein the mounting member includes a locking portion that locks a cable connected to the light source module.   The mounting unit according to claim 1, wherein the plurality of mounting members include a plurality of connection portions for connecting to other mounting units by fitting. A plurality of light source modules;
A plurality of attachment members having a plurality of fitted portions into which the plurality of light source modules are detachably fitted, and the plurality of attachment members arranged in a one-dimensional or two-dimensional manner are separated for each light source module. A planar light emitting device comprising: a mounting unit having a plurality of connecting portions that are connected to each other.   The light source module includes a circuit board, a light emitting element mounted on the circuit board, and a light redirecting element that emits light from the light emitting element to a bottom surface and exits sideways. The planar light emitting device described. The plurality of light source modules are connected in series via a cable,
The planar light-emitting device according to claim 5, wherein the attachment member includes a locking portion for locking the cable.   The planar light emitting device according to claim 5, wherein the light source module includes one or more LED chips. A plurality of light source modules each including a circuit board, a light emitting element mounted on the circuit board, and a light direction changing element that emits light from the light emitting element to a bottom surface, obliquely forward, and obliquely rearward;
A plurality of attachment members having a plurality of fitted portions into which the plurality of light source modules are detachably fitted, and the plurality of attachment members arranged in a one-dimensional or two-dimensional manner are separated for each light source module. An attachment unit having a plurality of connecting portions to be connected,
A planar light emitting device, comprising: a reflective surface that reflects forward light obliquely rearward from the plurality of light direction conversion elements.

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