JP2008226635A - Light source device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a new light source device suitable for efficiently illuminating a planar region. <P>SOLUTION: This light source device is provided with: a light guide member 120 having a body part 130 integrally formed of a resin, and extending in the longitudinal direction, and a first end 121 and a second end 122 formed at both ends of the body part; and LED light emitting devices 200 arranged oppositely to each other on at least either of the first end 121 and the second end 122. The body part 120 is meandered or bent in almost the same reference plane. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a light source device. This light source device relates to a device suitable for illuminating a planar area such as a backlight illumination device of a flat display device such as a liquid crystal display device.

  For example, Patent Document 1 discloses a liquid crystal display device. In such a liquid crystal display device, since the liquid crystal display panel itself does not emit light, a backlight is necessary. In this document, a cold cathode tube is used as a light source of such a backlight.

JP 2000-134413 A

  By the way, the reason why a cold cathode tube is adopted as a light source of a backlight in a liquid crystal display device is that it is considered to be optimal in consideration of the cost.

  However, the following problems still exist when using a cold cathode tube.

  First, in order to drive a cold cathode tube, it is necessary to boost the voltage using an inverter or the like in order to obtain a discharge voltage, which increases the cost of the power supply circuit.

  Second, cold cathode tubes are not suitable for the environment because harmful mercury vapor is contained inside.

  Third, the cold cathode tube emits light from the entire circumference, but since the direction to be illuminated is one direction, a lot of light is wasted and the efficiency is poor. Further, in order to solve this problem, it is necessary to take a measure such as disposing the reflecting member behind the cold cathode tube, which increases the cost.

  The present invention has been conceived under the circumstances described above, and solves the above-described problems in the case of using a cold cathode tube as a light source of a backlight of a liquid crystal display device or the like, and improves the efficiency of a surface area. It is an object of the present invention to provide a new light source device suitable for illumination.

  In order to solve the above problems, the present invention employs the following technical means.

  That is, the light source device provided by the present invention includes a main body portion that is integrally formed of resin and extends in the longitudinal direction, and a first end portion and a second end portion that are formed at both ends of the main body portion. A light source device comprising: a light guide member; and an LED light emitting device disposed to face at least one of the first end portion and the second end portion, wherein the main body portion is substantially It is characterized by meandering or bending in the same reference plane.

  In a preferred embodiment, the LED light emitting device has a plurality of concave portions or convex portions formed on an outer peripheral surface on one side of the main body portion with respect to the reference plane at least in a partial range in the longitudinal direction. In the range where the plurality of concave portions or convex portions are formed, the light incident on the main body portion tends to be emitted from the outer peripheral surface on the other side with respect to the reference plane of the main body portion.

  In a preferred embodiment, the main body includes a plurality of straight portions and a bent portion that connects the straight portions adjacent in the longitudinal direction.

  In a preferred embodiment, the bent portion connects the adjacent linear portions with an angle of 90 °, and reflects light from one adjacent linear portion toward the other adjacent linear portion. And a prism portion for forming a reflecting surface inclined at an angle of 45 ° with respect to the axis of each linear portion.

  In the light source device having the above-described configuration, the light incident on the light guide member from its end portion travels in the longitudinal direction of the main body portion of the light guide member while being totally reflected by the smooth surface. Such light is reflected by the plurality of concave portions or convex portions, so that the traveling direction is converted into a direction in which the light guide member is to be crossed. In general, the light travels inside the main body part toward a region facing the circumferential range in the peripheral surface where the concave portion or the convex portion is provided. In this region, the light is smaller than the total reflection critical angle. What reaches the peripheral surface at an angle is emitted to the outside.

  The main body is meandering or bent in substantially the same reference plane, and the plurality of recesses or projections are formed on one outer peripheral surface with respect to the reference plane. Therefore, by arranging the light guide member so that the reference plane is parallel to the liquid crystal display panel positioned on the other side, the light emitted from the main body as described above is emitted toward the liquid crystal display panel. be able to. Thus, the light source device having the above configuration can efficiently illuminate a planar irradiation region.

  Other features and advantages of the present invention will become more apparent from the detailed description given below with reference to the drawings.

  Hereinafter, a preferred embodiment of the present invention will be specifically described with reference to the drawings.

  1 to 6 show a first embodiment of a light source device 100 according to the present invention. The linear light source device 100 includes a light guide member 120 and LED light emitting devices 200 disposed at both ends of the light guide member 120.

  As shown in FIG. 1, the light guide member 120 includes a main body 130, and a first end 121 and a second end 122 at both ends of the main body 130. The main body 130 includes first and second linear light emitting units 130A and 130B extending in parallel with each other at a predetermined interval, and connecting the ends of these linear light emitting units 130A and 130B. An intermediate connecting portion 130E that extends orthogonally to the line 130B is provided. Therefore, the main body 130 is present in the same reference plane P (see FIG. 3). The light guide member 120 is integrally formed of a transparent resin such as PMMA or polycarbonate, and the peripheral surface has a smooth mirror surface.

  As shown in FIGS. 3, 5, 6, etc., the first and second linear light emitting portions 130 </ b> A and 130 </ b> B have a substantially cylindrical shape having a uniform circular cross section over the entire length, and the diameter is For example, it is about 4 mm. The intermediate connecting portion 130E also has a substantially cylindrical shape with a uniform circular cross section, and its diameter is, for example, about 4 mm. The bent portion that connects both the straight light emitting portions 130A and 130B and the intermediate connecting portion 130E has reflecting surfaces 140a and 141a that intersect the axes of the two straight light emitting portions 130A and 130B at an angle of 45 ° in the plan view shown in the figure. Prism portions 140 and 141 are formed.

  As is well understood from FIGS. 1, 2, and 6, a belt-like region 134 having a predetermined width and extending in the longitudinal direction is set on the peripheral surfaces of the first and second linear light emitting units 130 </ b> A and 130 </ b> B. A plurality of concave portions 131 and convex portions 132 arranged in the longitudinal direction are alternately and continuously formed in the region 134. As is well understood from FIG. 3, the band-like region 134 is formed at a position facing one side of the reference plane P among the peripheral surfaces of the two linear light emitting portions 130 </ b> A and 130 </ b> B. The upper surface 132a of each convex portion 132 is a flat surface, and each concave portion 131 is formed so as to have a uniform cross section and extend in the width direction of the belt-like region 134. The bottom of each recess 131 has a cylindrical inner surface, and the recess 131 and the upper surface 132a of the projection 132 are connected by a smooth cylindrical outer surface. Flat portions 135 are formed on both sides in the width direction of the belt-like region 134 so as to extend along the entire length. The flat portions 135 located on both sides of the belt-like region 134 are located in the same plane and are formed so as to be parallel to the center lines of the two linear light emitting portions 130A and 130B. As described above, the diameters of the first and second linear light-emitting portions 130A and 130B are 4 mm, for example, but the width of the band-shaped region 134 is 1.6 mm, for example, and the width of each flat portion 135 is 0.35 mm, for example. The height of the portion 132 with respect to the flat portion 135 is set to, for example, 0.19 mm, the depth of the concave portion 131 with respect to the upper surface 132a of the convex portion 132 is set to, for example, 0.18 mm, and the formation pitch of each concave portion 131 is, for example, Set to 1.5 mm. However, these dimensions can be variously set according to the diameters of the two linear light emitting portions 130A and 130B. In this embodiment, the recess 131 and the protrusion 132 are formed so as to extend in a uniform cross section in the width direction of the band-shaped region 134, but a concave spherical surface is formed on the flat surface formed in the band-shaped region 134. A dent or a convex spherical projection may be provided.

  On the other hand, the intermediate connecting portion 130E has a simple cylindrical shape in this embodiment, and the concave portion 131 or the convex portion 132 as provided in both the linear light emitting portions 130A and 130B is not formed.

  Further, the first and second end portions 121 and 122 of the light guide member, that is, the base end portions of the first and second linear light-emitting portions 130A and 130B are provided with square socket portions 121A and 122A. Are integrally formed.

  As the LED light emitting device 200, a package-type white LED mounted on a substrate 210 is preferably used, but red (R), green (G), and blue (B) LED bare chips are mounted on the substrate 210. May be. The substrate 210 has, for example, a long rectangular shape, and the LED light emitting device 200 is mounted on one end in the longitudinal direction, and the remaining area is used as an area for dissipating heat and wiring patterns. As the material of the substrate 210, it is desirable to employ aluminum nitride that is extremely excellent in thermal conductivity. In this embodiment, in order to further improve the heat dissipation performance of the substrate 210, a heat sink 220 made of aluminum or aluminum alloy having a predetermined thickness is bonded to the back side of the substrate 210 in a laminated form.

  Cooperation of the LED light emitting device 200 mounted on the substrate 210 with respect to the first end portion 121 and the second end portion 122 of the light guide member 120 accommodates the LED light emitting device 200 in the socket portions 121A and 122A. In this way, the socket portions 121A, 122A and the substrate 210 are connected by, for example, bonding.

  Next, the operation of the light source device 100 having the above configuration will be described.

  When the LED light-emitting device 200 is turned on at the first and second end portions 121 and 122 of the light guide member 120, the light emitted from the LED light-emitting device 200 is emitted from the first light guide member 120. It is made to inject into 1st and 2nd linear light emission part 130A, 130B from the edge part 121 and the 2nd edge part 122 (refer FIG. 4). The light incident on both linear light emitting portions 130A and 130B in this way travels in the longitudinal direction while being totally reflected on the smooth surfaces of both linear light emitting portions 130A and 130B, as schematically shown in FIG. To do. As schematically shown in FIG. 4, a part of such light is reflected by the recess 131 and the traveling direction is changed in a direction to cross both the linear light emitting units 130 </ b> A and 130 </ b> B. The light whose direction of travel has been changed in this manner is generally in a region facing the belt-like region 134 provided with the concave portion 131 and the convex portion 132 in both linear light emitting portions 130A and 130B, as schematically shown in FIG. In this region, what has reached the peripheral surfaces of both linear light emitting portions 130A and 130B at an angle smaller than the total reflection critical angle is emitted to the outside. Thus, both the linear light emitting portions 130A and 130B have a substantially cylindrical shape, that is, the band-like regions (the concave portion 131 and the convex portion 132 are formed on the peripheral surfaces of the linear light emitting portions 130A and 130B. (Region) 134 and the convex lens effect due to the portions excluding the flat surfaces 135 on both sides thereof having a cylindrical outer surface, it is possible to suppress the emitted light from spreading in the circumferential direction of the linear light emitting portions 130A and 130B. , The target area A can be concentrated.

  As described above, the belt-like region 134 where the concave portion 131 and the convex portion 132 provided in the first and second linear light emitting portions 130A and 130B are formed is formed so as to face one side of the reference plane P. The light emitted from both the linear light emitting units 130A and 130B can be concentrated and emitted toward the other side of the reference plane P.

  The light that reaches one end of one of the linear light emitting units 130A and 130B is reflected by the reflecting surfaces 140a and 141a of the prism units 140 and 141, travels in the longitudinal direction of the intermediate coupling unit 130E, and further, the prism unit 140. , 141 is reflected by the reflecting surfaces 140a, 141a, proceeds in the longitudinal direction from one end of the other linear light emitting portions 130A, 130B, and is emitted to the other side of the reference plane P in the same manner as described above.

  As described above, the light source device 100 configured as described above has no need to install a reflecting member behind (in one side of the reference plane) from the linear light emitting units 130A and 130B that are parallel to each other in the main body 130 that bends. Illumination light can be efficiently emitted toward one side, which is suitable as a light source device for illuminating a planar illumination area. Moreover, since mercury vapor is not used unlike a cold cathode tube, there is no environmental problem. Furthermore, since the light guide member 120 is a resin molded product, even if it collides with an external object, the light guide member 120 is not easily damaged like a cold cathode tube, so that the light source device 100 is extremely excellent in handleability.

  In addition, since the LED light emitting device 200 is arranged to face one end of both the linear light emitting portions 130A and 130B while including two linear light emitting portions 130A and 130B parallel to each other, Therefore, wiring for external connection is facilitated.

  Further, since the band-like region 134 in which the concave portion 131 and the convex portion 132 provided in the both linear light emitting portions 130A and 130B are formed is formed between the flat portions 135, the basics of the both linear light emitting portions 130A and 130B are formed. Even if the outer shape is substantially cylindrical, the width of the band-like region 134 can be clearly defined so as to extend with a constant width over the longitudinal direction of both the linear light emitting portions 130A and 130B. Therefore, the action of changing the direction of the light traveling in the longitudinal direction inside both the linear light emitting portions 130A and 130B and emitting the light from the outer surface on the opposite side of the belt-like region 134 is caused in the longitudinal direction of the both linear light emitting portions 130A and 130B. It becomes possible to carry out without variation in various places. In addition, when creating a mold for forming the light guide member 120, it is also easy to create a mold inner surface shape for forming the concave portion 131 and the convex portion 132.

  In addition, in the light source device 100 configured as described above, aluminum nitride is adopted as the material of the substrate 210 on which the LED light emitting device 200 is mounted, and the mounting region and the heat dissipation region of the LED light emitting device 200 are provided on the substrate 210. In addition, since the heat sink 220 made of aluminum or aluminum alloy is laminated and bonded to the back side of the substrate 210, the heat generated when the LED light emitting element 200 is turned on can be released to the outside very efficiently. . As a result, the LED light emitting device 200 can be continuously lit for a long time with high output, and the illumination light source is extremely efficient.

  FIG. 7 shows a modification of the first embodiment described above. In this modification, the first end portion 121 and the second end portion 122 of the light guide member 120 share the substrate 210 on which each LED light emitting device 200 is mounted and the heat sink 220 laminated on the substrate 210. ing. In this way, the distance between the first end portion 121 and the second end portion 122 of the light guide member 120 can be accurately defined to improve handling, and the substrate 210 and the heat sink 220 can The heat dissipation function can be further enhanced.

  FIG. 8 shows a second embodiment of the light source device according to the present invention. Compared with the light source device 100 according to the first embodiment illustrated in FIGS. 1 to 6, the light source device 100 </ b> A according to the second embodiment performs LED light emission only at the first end 121 of the light guide member 120. The difference is that the device 200 is opposed and the reflection means 250 is provided at the second end 122. As shown in FIG. 8, the reflecting means 250 has a second end 122 as a flat end surface orthogonal to the axis of the second linear light emitting unit 130B, and a white coating so as to cover the end surface. In addition to forming a reflective film 250a made of a film or a metal vapor-deposited film, the second end 122 is formed in a conical shape whose bus is inclined at an angle of 45 °, as shown in FIG. In this way, the light that has reached the end of the second linear light emitting unit 130B via the first linear light emitting unit 130A and the intermediate coupling unit 130E is reversely moved by the reflecting means 250 while In the second linear light emitting unit 130B and the first linear light emitting unit 130A, the light is emitted toward the other surface side of the reference plane P in the same manner as described above.

  FIG. 10 shows a third embodiment according to the present invention. In the light source device 100B according to the third embodiment, the light guide member 120 includes first to fourth linear light emitting units 130A, which are parallel to each other at a predetermined interval in the same reference plane P (FIG. 11). 130B, 130C, and 130D are provided with a configuration in which three intermediate connection portions 130E, 130F, and 130G are integrally connected in a zigzag manner. Two linear light emitting portions 130A and 130B are connected by one intermediate connection portion 130E. Different from the light source device 100 according to the first embodiment. That is, in the light source device 100B, one end portions of the first linear light emitting unit 130A and the second linear light emitting unit 130B are connected by the first intermediate connecting unit 130E, and the second linear light emitting unit 130B and the third linear light emitting unit 130B are connected. The other end portions of the linear light emitting portion 130C are connected by the second intermediate connecting portion 130F, and one end portions of the third linear light emitting portion 130C and the fourth linear light emitting portion 130D are connected by the third intermediate connecting portion 130G. It is connected. Each of the intermediate connecting portions 130E, 130F, and 130G has a cylindrical shape that extends orthogonally to each of the linear light emitting portions 130A, 130B, 130C, and 130D. The LED light-emitting device 200 mounted on the substrate 210 is preferably housed in the rectangular socket portions 121A and 122A at the first end portion 121 and the second end portion 122 of the series of light guide members 120, respectively. Are facing each other. A heat sink 220 is laminated on the substrate 210.

  The configuration of each of the linear light emitting portions 130A, 130B, 130C, and 130D is the same as that described above for the first embodiment, and the concave portion 131 and the convex portion 132 facing one side of the reference plane P form a band-like region 134. However, it is formed. In the connecting portions between the straight light emitting portions 130A, 130B, 130C, and 130D and the intermediate connecting portions 130E, 130F, and 130G, the reflective surfaces 140a, 141a, 142, and the like are the same as described above for the first embodiment. Prism portions 140, 141, 142, 143, 144, and 145 having 143a, 144a, and 145a are formed.

  In the light source device 100B according to the above configuration, the first end portion 121 and the second end portion 122 of the light guide member 120, that is, the longitudinal directions of the first linear light emitting portion 130A and the fourth linear light emitting portion 130D. The light from the LED light emitting device 200 incident on the one end is reflected by the concave portion 131 while traveling through the linear light emitting portions 130A and 130D, and the peripheral surface opposite to the belt-like region 134. It is emitted from. This point is the same as described in the first embodiment. The light traveling in the first and fourth linear light emitting units 130A and 130D as described above is reflected by the reflecting surfaces 140a and 145a of the prism units 140 and 145 to be reflected in the first and third intermediate coupling units 130E, The light travels in the interior of 130G and is reflected by the reflecting surfaces 141a and 144a of the prism portions 141 and 144 to travel through the second and third linear light emitting portions 130B and 130C. Thus, while traveling inside the second and third linear light emitting units 130B and 130C, the light is reflected by the recess 131 and is emitted from the peripheral surface opposite to the band-like region 134. Further, the light reaching the end portions of the second and third linear light emitting units 130B and 130C is connected to another linear light emitting unit adjacent to the second intermediate coupling unit 130F via the second intermediate coupling unit 130F. In the same manner as described above, the light is reflected from the recess 131, and is emitted from the side opposite to the side where the band-like region 134 is formed in the linear light emitting portion.

  That is, the light incident from the first end 121 of the light guide member 120 is the first linear light emitting unit 130A, the first intermediate coupling unit 130E, the second linear light emitting unit 130B, and the second intermediate coupling. While traveling in the portion 130F, the third linear light emitting portion 130C, the third intermediate connecting portion 130G, and the fourth linear light emitting portion 130D, in each linear light emitting portion, the side where the band-like regions 134 are formed The light emitted to the opposite side and incident from the second end 122 of the light guide member 120 is a fourth linear light emitting unit 130D, a third intermediate coupling unit 130G, a third linear light emitting unit 130C, While the second intermediate connecting portion 130F, the second linear light emitting portion 130B, the first intermediate connecting portion 130E, and the first straight light emitting portion 130A are traveling, the belt-like regions 134 are formed in each linear light emitting portion. On the opposite side It's brought Isa. Thereby, light irradiation is performed toward the other side of the reference plane P in the first to fourth linear light emitting units 130A, 130B, 130C, and 130D.

  FIG. 12 shows a modification of the light source device 100B according to the third embodiment of the present invention described above. In the light source device 100 </ b> B, the substrate 210 on which the LED light emitting device 200 is disposed so as to face the first end 121 of the light guide member 120 and the second end 122 of the light guide member 120 are opposed. And the substrate 210 on which the LED light emitting device 200 is mounted is integrally connected. As described above, if aluminum nitride having excellent thermal conductivity is adopted as the substrate 210, and a heat sink 220 made of aluminum or aluminum alloy is laminated on the substrate 210, the heat dissipation area is expanded. The heat generated when the LED light-emitting device 200 is turned on can be dissipated to the outside more quickly, and the temperature rise during the continuous lighting of the LED light-emitting device 200 can be suppressed to extend its life. Further, the positions of the first end portion 121 and the second end portion 122 of the light guide member 120 can be mechanically defined, and the handleability of the light source device 100B is improved and the position to be assembled is improved. Installation work is also easy.

  FIG. 13 shows a usage example of the light source device 100B according to the third embodiment. In the figure, reference numeral 300 denotes a liquid crystal display panel, and behind the light source device 100B, the reference plane P is parallel to the liquid crystal display panel 300, and the linear light emitting units 130A, 130B, and 130C. , 130D are arranged so that the band-like region 134 provided with the concave portion 131 and the convex portion 132 is located on the opposite side to the liquid crystal display panel 300. If necessary, a light diffusing member such as a light diffusing layer sheet can be disposed between the light source device 100B and the liquid crystal display panel 300.

  Illumination light is emitted toward the back surface of the liquid crystal display panel 300 from a plurality of linear light emitting units 130A, 130B, 130C, and 130D arranged at predetermined intervals on the back surface side of the liquid crystal display panel 300. In this case, since light is not emitted from the respective linear light emitting units 130A, 130B, 130C, and 130D to the entire circumference unlike a cold cathode tube, the liquid crystal can be obtained without arranging a reflection member behind the light source device 100B. The back surface of the display panel 300 can be illuminated sufficiently efficiently. In addition, the LED light emitting device 200 is disposed at both end portions 121 and 122 of the series of light guide members 120 while the plurality of linear light emitting units 130A, 130B, 130C, and 130D exist, and the linear light emitting units 130A, 130B, Since it is arrange | positioned at the longitudinal direction one side of 130C and 130D, the external connection wiring for LED light-emitting device 200 becomes easy. Further, the light source device 100B is extremely easy to handle because it is not easily damaged by an impact or the like unlike a cold cathode tube.

  Thus, the light source device having the above-described configuration is suitable for performing planar illumination efficiently and with excellent handling properties.

  Of course, the present invention is not limited to the above-described embodiments, and all modifications within the scope of the matters described in the claims are all included in the scope of the present invention.

  For example, in the above-described embodiment, the linear light emitting units 130A to 130D of the light guide member 120 have a substantially cylindrical shape. However, as long as the columnar shape is used, the shape is not limited to such a cylindrical shape. It is desirable not to form a clear ridge line as much as possible on the peripheral surface other than the flat portion 135, and for example, a substantially elliptic cylindrical shape may be used.

  In the above-described embodiment, the intermediate connecting portions 130E, 130F, and 130G are not provided with the concave portion 131 and the convex 132 portion. However, the intermediate connecting portions 130E, 130F, and 130G also have the linear light emitting portions 130A to 130D. Similarly, the concave portion 131 and the convex portion 132 may be provided. If it does in this way, light can be radiate | emitted also from each intermediate | middle connection part 130E, 130F, 130G similarly to each linear light emission part 130A-130D.

  Furthermore, in the said 3rd Embodiment, although the light guide member 120 is the structure which integrally cooperated four linear light-emitting parts 130A-130D in the zigzag form via intermediate | middle connection part 130E, 130F, 130G, May be further increased.

It is a front view which shows the whole structure of the light source device which concerns on 1st Embodiment of this invention. It is the A section enlarged view of FIG. It is an expanded sectional view which follows the III-III line of FIG. It is an expanded sectional view which follows the IV-IV line of FIG. It is sectional drawing which follows the VV line of FIG. It is an expansion perspective view for demonstrating the linear light emission part in the main-body part of a light guide member. It is a front view which shows the whole structure of the modification of the light source device which concerns on the said 1st Embodiment. It is a front view which shows the whole structure of the light source device which concerns on the 2nd Embodiment of this invention. It is a fragmentary sectional view which shows the modification of the light source device which concerns on the said 2nd Embodiment. It is a front view which shows the whole structure of the light source device which concerns on the 3rd Embodiment of this invention. It is an expanded sectional view which follows the XI-XI line of FIG. It is a front view which shows the whole structure of the modification of the light source device which concerns on the said 3rd Embodiment. It is explanatory drawing of the usage example of the light source device which concerns on this invention.

Explanation of symbols

100, 100A, 100B Light source device 120 Light guide member 121 First end portion 121A Socket portion 122 Second end portion 122A Socket portion 130 Body portion 130A to 130D Straight portion (straight light emitting portion)
130E to 130G Intermediate connecting part 131 Concave part 132 Convex part 134 Band-like area 135 Flat part 200 LED light emitting device 210 Substrate 220 Heat sink 250 Reflector 300 Liquid crystal display panel A Target area P Reference plane

Claims (4)

A main body formed integrally with the resin and extending in the longitudinal direction; a light guide member having a first end and a second end formed at both ends of the main body; and the first end An LED light emitting device disposed opposite to at least one of the second end portions, and a light source device comprising:
The light source device, wherein the main body is meandering or bent in substantially the same reference plane.   On the outer peripheral surface on one side with respect to the reference plane in the main body portion, a plurality of concave portions or convex portions are formed at least in a partial range in the longitudinal direction, so that the light enters the main body portion from the LED light emitting device. 2. The light source device according to claim 1, wherein light tends to be emitted from an outer peripheral surface on the other side of the main body portion with respect to the reference plane in a range where the plurality of concave portions or convex portions are formed.   The light source device according to claim 2, wherein the main body includes a plurality of straight portions and a bent portion that connects the straight portions adjacent in the longitudinal direction.   The bent portion connects the adjacent straight portions with an angle of 90 °, and reflects the light from one adjacent straight portion toward the other adjacent straight portion with respect to the axis of each straight portion. The light source device according to claim 3, further comprising a prism portion for forming a reflecting surface inclined at an angle of 45 °.

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