JP4404424B2 - Linear light source unit - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a linear light source unit used as a light source for a backlight of a display device such as a liquid crystal panel and an illumination light source for an image reading device used for a copying machine, an image scanner, a barcode reader, or the like.
[0002]
[Prior art]
In recent years, light-emitting diodes (hereinafter referred to as LEDs) have been widely used as light-emitting members of linear light source units used as backlight light sources for display devices and illumination light sources for image reading devices. The LED is most suitable for downsizing such a device, which is considered to lead to cost reduction.
[0003]
In a conventional linear light source unit having such a light emitting member such as an LED, a light guide member is used to reduce the number of light emitting members and to obtain uniform illumination intensity, and light emitted from the light emitting members is used. A configuration in which light is incident on a light guide member to guide light in a desired direction is known.
[0004]
6A and 6B are diagrams showing the configuration of such a conventional linear light source unit, where FIG. 6A is a perspective view, FIG. 6B is a top view, FIG. 6C is a front view, and FIG. FIG. In FIG. 6, the linear light source unit 110 has a long light guide member 120 made of transparent resin or the like, a light emitting member 133 made of LED, and a reflecting member 124. Here, in FIG. 6A, the illustration of the reflecting member 124 is omitted for convenience.
[0005]
The light guide member 120 has a first side surface 120 a that functions as a light exit surface, a second side surface 120 b that faces the first side surface, and the other end surface 120 c of the light guide member 120 that faces the light emitting member 133. The second side surface 120b of the second side surface 120b has an inclined surface 120b1 that gradually decreases in distance from the first side surface 120a toward the end surface 120d, and in the thickness direction of the light guide member 120 (or the end surface 120c). A plurality of concave grooves 122 having an arc-shaped cross section extending in a parallel direction are formed to form an uneven surface. The first side surface 120a and the second side surface 120b including the concave groove 122 have a mirror finish. The light emitting member 133 is made of an LED, is held on an LED substrate 131 that rises from a mother board (not shown), and is electrically connected to a light emitting member driving circuit (not shown). When a predetermined drive current flows from the light emitting member drive circuit to the light emitting member 133, the light emitting member 133 emits light.
[0006]
[Problems to be solved by the invention]
In the linear light source unit 110, the light emitted from the light emitting member 133 enters the light guide member 120 from the end face 120c, but a part of the light is emitted from the second side face 120b as shown in FIG. The light enters the concave groove 122, is totally reflected, and exits from the first side surface 120a. On the other hand, most of the light entering the light guide member 120 that is directly incident on the first side surface 120a is reflected into the light guide member 120 by total reflection. In this way, the light incident on the light guide member 120 shows the strongest reflection near the top of the concave groove 122 and is emitted to the outside. For this reason, the intensity of the corresponding emitted light is clearly separated between the portion with and without the concave groove 122.
[0007]
That is, as shown in FIG. 7, the light emitted from the light guide member 120 periodically changes in luminance in the longitudinal direction, resulting in striped luminance unevenness. In FIG. 7, the horizontal axis indicates the position in the longitudinal direction of the first side surface 120 a that is the emission surface extending from the end surfaces 120 c to 120 d, and the vertical axis indicates the luminance of illumination light emitted to the outside from the side surface 120 a. The reflecting member 124 shown in FIG. 6 is made of a metal plate or the like, and is disposed close to or opposite to the side surface other than the first side surface 120a, and transmits to the outside through the side surface other than the first side surface 120a. The reflected light is returned to the inside of the light guide member 120 by reflection.
[0008]
The illumination unevenness emitted from the linear light source 110 has the above-described luminance unevenness, which is not preferable when the linear light source is used directly as an illumination unit such as a scanner, for example, because the reading accuracy decreases. Of course, in addition to this, a planar light source configured by combining such a linear light source and a light guide plate has the following problems. FIG. 8 is a perspective view showing a planar light source 140 unit configured by directly coupling a linear light source unit 110 and a planar light guide plate 130 as shown in FIG. Here, one main surface 130a of the planar light guide plate 130 functions as a light exit surface and is mirror-finished. The other main surface 130b facing the one main surface 130a is a diffusing surface or a reflecting surface, and is subjected to roughening such as embossing.
[0009]
The first side surface 120a, which is the light exit surface of the linear light source unit 120, is coupled to one side surface of the planar light guide plate 130, and the light emitted from the first side surface 120a enters the planar light guide plate 130, The main light 130a is a light exit surface and the other main surface 130b which is a diffusing surface is repeatedly reflected and travels across the entire surface, and at the same time, a planar illumination from one main surface 130a. Light 145 is emitted. In this case, since the incident light itself from the first side surface 120a of the linear light source unit 120 to the planar light guide plate 130 has striped luminance unevenness, the influence is also exerted on the planar light guide plate 130. In addition, luminance unevenness also occurs in the planar illumination light 145 emitted from one main surface 130a of the planar light guide plate 130. Such luminance unevenness is particularly remarkable in the vicinity of the connection portion between the planar light guide plate 130 and the linear light source unit 120. If luminance unevenness occurs in the illumination light from the planar light guide plate, unintended brightness unevenness occurs in a display member such as a liquid crystal panel illuminated by the planar light source 140, and display quality deteriorates.
[0010]
Therefore, conventionally, it has been necessary to take the following measures. 9A and 9B are diagrams showing a configuration of a planar light source unit according to a known improvement in which measures are taken for the planar light source unit shown in FIG. 8, wherein FIG. 9A is a perspective view, and FIG. 9B is a perspective view from the light source 130 side. FIG. As shown in FIG. 9, in the planar light source unit 140 of this example, a light diffusion means 135 such as a diffusion sheet is provided between the light guide member 120 and the planar light guide plate 130 of the linear light source unit, and this portion is Luminance unevenness of the planar illumination light 145 emitted from one main surface 130a of the planar light guide plate 130 by diffusing the light to pass through and guiding the uniform light to the planar light guide plate 130 in advance. We are trying to reduce. However, the surface light source 140 increases the manufacturing cost by providing the diffusion means 135 such as a diffusion sheet. Further, since the diffusing unit 135 diffuses the light in various directions, some of the diffused light is not incident on the planar light guide plate 130, and as a result, the luminance level of the illumination light 145 emitted from the planar light source 140. Reduce.
[0011]
The present invention relates to a conventional linear light source including a long light guide member and a light emitting member such as an LED, and an object thereof is to improve the luminance unevenness in the emitted light. The present invention further eliminates the need for light diffusion means such as the above diffusion sheet in a planar light source formed by combining such a linear light source and a planar light guide plate, and reduces luminance unevenness without reducing the luminance of illumination light. It also improves and prevents an increase in manufacturing costs.
[0012]
[Means for Solving the Problems]
In order to solve the above problems, as a first means, the present invention includes an elongated light guide member which emits illumination light from the first side, the light emitting member which light enters the light guide member the provided, the second side opposite the first side surface of the light guide member, a plurality of linear light source unit provided with a concave groove that reflects incident light from the light emitting member, wherein the light emitting member, R, G, an LED of B, the longitudinal direction of the plurality of concave grooves characterized in that it interlinked direction obliquely incident light from the light emitting member.
[0013]
In order to solve the above problems, as a second means, the present invention includes a first side, a second side opposite to the side surface of the first out of the light beam, said first side and said A long light guide member provided with a third side surface and a fourth side surface, which is substantially orthogonal to the second side surface and extends in the horizontal direction to partition the vertical width thereof, and the longitudinal direction of the light guide member a light-emitting member which light enters the light guide member from the end face for partitioning, the to a second aspect, the plurality of linear light source unit provided with a concave groove that reflects incident light from the light emitting member, the light emitting member, R, G, an LED of B, the longitudinal direction of the plurality of concave grooves, characterized in that inclined 30 degrees to 60 degrees to the third aspect or fourth aspect.
[0014]
In order to solve the above problems, as a third means, the present invention includes a first side, a second side opposite to the side surface of the first out of the light beam, said first side and said A long light guide member provided with a third side surface and a fourth side surface, which is substantially orthogonal to the second side surface and extends in the horizontal direction to partition the vertical width thereof, and the longitudinal direction of the light guide member a light-emitting member which light enters the light guide member from the end face for partitioning, the to a second aspect, the plurality of linear light source unit provided with a concave groove that reflects incident light from the light emitting member, the light emitting member, R, is an LED of G, B, a longitudinal direction of the plurality of concave grooves, characterized in that inclined approximately 45 degrees relative to the third aspect or fourth aspect. In order to solve the above-mentioned problem, as a fourth means, the present invention relates to the R, G, B LEDs in a direction substantially parallel or perpendicular to the first side surface or the second side surface. It is characterized by being arranged in an overlapping manner.
[0015]
In order to solve the above problems, as a fifth means, the present invention, in any one of the first means to the fourth means, the cross-section of a plurality of concave grooves provided on the second side It is substantially arc-shaped or V-shaped.
[0016]
In order to solve the above problems, as a sixth aspect of the present invention, in any one of the first means to the fifth means, plate-like planar for emitting illumination light of the planar light source unit the linear light source unit on the side surface of the light guide plate as a direct bond or together, characterized in that for the incident light reflected from said second side to said planar light guide plate.
[0017]
In order to solve the above problems, as a seventh means, the present invention, in any one of the first means or the sixth means, said first side surface, said second side surface and the plurality of surface of the concave grooves characterized in that the diffusion treatment such as mirror finishing or grain is applied.
[0018]
In order to solve the above problems, as a eighth means, the present invention, in any one of the first means or the seventh means, the distance between the first side and the second side the As the distance from the light emitting member increases, the size decreases.
[0022]
In order to solve the above problems, as a ninth means, the present invention is any one of means of the first means to eighth, the second aspect, or the second aspect, the first third aspect and adhesion or close to the fourth aspect, characterized by being arranged a reflective member made of reflective tape or reflecting plate.
[0023]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of the present invention will be described with reference to the drawings. This embodiment relates to a linear light source unit. FIG. 1 is a diagram showing a configuration of a linear light source unit according to the present embodiment, where (a) is a perspective view, (b) is a top view, (c) is a front view, and (d) is a light emitting member described later. It is the side view seen from 3 side. In FIG. 1A, the reflection member 4 described later is omitted for convenience. In FIG. 1, reference numeral 1 denotes a linear light source unit, which has a long light guide member 2 made of a transparent resin or the like, a light emitting member 3 made of LEDs, and a reflecting member 4.
[0024]
The light guide member 2 has a first side surface 2a that functions as a light exit surface, a second side surface 2b that faces the first side surface, a first side surface, and a second side surface that are substantially orthogonal to each other and extend in the horizontal direction. A third side surface 2e and a fourth side surface 2f that partition the width in the vertical direction of the light source, the light emitting member 3 and one end surface 2c that partitions the longitudinal direction of the light guide member 2 and the other facing the one end surface End surface 2d. The second side face b is provided with a plurality of concave grooves 12 extending in a direction inclined by 30 to 60 degrees with respect to the third side face 2e or the fourth side face 2f. It has been. The flat surface portion 2b1 other than the plurality of concave grooves 12 on the second side surface 2b is located between the first side surface 2a and the end surface 2c of the light guide member 2 facing the light emitting member 3 toward the other end surface 2d. The distance becomes an inclined surface that gradually decreases. The surfaces of the first side surface 2a, the second side surface 2b, and the plurality of concave grooves 12 are mirror-finished.
[0025]
The light emitting member 3 is made of an LED, and is held at a position close to and facing the end surface 2c of the light guide member 2 by an LED substrate 31 rising from a mother board (not shown), and is electrically connected to a light emitting member driving circuit (not shown). When a predetermined drive current flows from the light emitting member drive circuit to the light emitting member 3, the light emitting member 3 emits light. As the light emitting member 3 made of an LED, for example, a white LED can be used.
[0026]
When the light emitting member 3 emits light, the light enters the light guide member 2 from the end face 2c. Most of the light entering the light guide member 2 is directly or after reflection by the first side surface 2a or after reflection between the flat portion 2b1 of the second side surface and the first side surface 2a. 2 reaches the surface of the plurality of concave grooves 12 provided on the second side surface 2b, is reflected toward the first side surface 2a by total reflection, and is emitted from the first side surface 2a as illumination light. At this time, since the plurality of concave grooves 12 exhibit the strongest reflection near the top of the groove, the illumination light is originally light-irradiated in a portion with and without the groove as in the conventional example shown in FIG. There is a nature that can be divided.
[0027]
However, in the present embodiment shown in FIG. 1, since the plurality of concave grooves 12 are provided obliquely, there is an effect as if the grooves are provided continuously. Thus, the separation of the intensity of the illumination light is greatly improved, and uniform illumination light with less luminance unevenness can be emitted. In addition, even if the oblique angle of the concave groove 12 is 30 degrees or less or 60 degrees or more with respect to the third side surface 2e or the fourth side surface 2f, the reflection efficiency for uniform illumination is lowered, and it takes 45 degrees. It has been recognized from the inventors' experience that it is most desirable for increasing the reflection efficiency and eliminating the luminance unevenness of the illumination light. FIG. 2 is a view showing the luminance distribution of the illumination light emitted from the first side surface 2 a along the longitudinal direction of the light guide member 120 when the oblique angle of the concave groove 12 is about 45 degrees. In FIG. 2, the horizontal axis indicates the position in the longitudinal direction of the first side surface 2a, which is the emission surface from the end surfaces 2c to 2d, and the vertical axis indicates the luminance of illumination light emitted from the side surface 2a to the outside. As shown in FIG. 2, in this case, the luminance is almost constant regardless of the location.
[0028]
As shown in FIG. 1, the reflecting member 4 is disposed adjacent to and opposite to the side surface of the light guide member 2 other than the first side surface 2a, that is, the second side surface 2b, the third side surface 2e, and the fourth side surface 2f. The light guide member 2 is made of a covering member made of a metal such as a U-shaped cross section and reflects light emitted to the outside from the second side surface 2b, the third side surface 2e, and the fourth side surface 2f. Play a role to return to. As a result, light that is wastedly transmitted to the outside is reduced, the optical path conversion efficiency is increased, and finally the amount of illumination light emitted from the first side surface 2a is further increased, thereby contributing to the improvement of the luminance of illumination light. . In this case, in particular, when the incident angle of the light incident from the inside of the light guide member 2 with respect to the surface of the concave groove 12 is equal to or smaller than the critical angle θc, the light is transmitted to the outside without being totally reflected. The effect that the transmitted light is reflected by the reflecting member 4 and reused is great. Even if the reflecting member is provided only on the second side surface 2b, there is a considerable effect. The reflection member may be a reflection tape or the like.
[0029]
In this way, the linear light source unit 1 according to the present embodiment can emit uniform illumination light with little luminance unevenness from the first side surface 2a of the light guide member that is the light output surface. Therefore, when such a linear light source unit 1 is directly used as an illumination means, the object can be illuminated with uniform brightness in a linear illumination region. For example, in a scanner, such a linear light source unit can be used as illumination light for an original, enabling illumination with a uniform brightness of a reading line, and contributing to improving reading fidelity and reproducibility as compared with conventional techniques. .
[0030]
As described above, in the present embodiment, the surfaces of the first side surface 2a, the second side surface 2b, and the plurality of concave grooves 12 of the light guide member 2 are mirror-finished. Not limited to these, even if these surfaces have been subjected to diffusion processing such as wrinkles, the same effects as described above are obtained due to the reflective action of the surfaces. Further, the cross-sectional shape of the plurality of concave grooves 12 is not limited to the circular arc shape as shown in FIG. 1, and even if it is V-shaped, it has substantially the same reflective action as described above due to the continuity of the grooves. Have almost the same effect.
[0031]
Next, according to the present invention, by combining such a linear light source unit and a planar light guide plate, an excellent planar light source unit used as a backlight or other illumination means for a planar display device such as a liquid crystal panel is obtained. Can be configured. FIG. 3 is a diagram showing the configuration of such a planar light source using a linear light source as another embodiment of the present invention, wherein (a) is a perspective view and (b) is a side view. In FIG. 3, 10 is a planar light source unit, and 7 is a planar light guide plate. The planar light source unit 10 is a combination of the planar light guide plate 7 and the linear light source unit 1 shown in FIG. 1, and the symbols of the constituent members relating to the linear light source unit 1 are the same as those in FIG. Here, the planar shape of the planar light guide plate 7 is a quadrangle, and one main surface 7a functions as a light exit surface and is mirror-finished. The other main surface 7b facing the one main surface 7a is a diffusing surface or a reflecting surface, and dots are formed by roughing such as embossing.
[0032]
The first side surface 2a which is the light exit surface of the linear light source unit 1 is coupled to one side surface of the planar light guide plate 7, and the emitted light from the first side surface 2a enters the planar light guide plate 7, A planar illumination from one main surface 7a while proceeding over the whole while repeating reflection between one main surface 7a which is a light output surface of the planar light guide plate 7 and the other main surface 7b which is a diffusion surface. Light 11 is emitted. In this case, since the incident light itself from the first side surface 1a of the linear light source unit 1 to the planar light guide plate 7 has uniform luminance with almost no luminance unevenness, the influence thereof is the planar light guide plate. 7, illumination light 11 having uniform brightness with almost no luminance unevenness is emitted from one main surface 7 a of the planar light guide plate 7.
[0033]
Thus, according to the planar light source unit 10 according to the present embodiment, a diffusion sheet is provided between the linear light source unit and the planar light guide plate as in the conventional planar light source unit (140) shown in FIG. Since the illumination light having uniform brightness with almost no luminance unevenness can be obtained without interposing the diffusion member (135), etc., the manufacturing cost can be reduced as compared with the conventional method. Further, the brightness of the illumination light caused by the diffusing means is not reduced, and illumination brighter than before is possible.
[0034]
In the case of the planar light source unit 10 shown in FIG. 3, after the light guide member 2 and the planar light guide plate 7 of the linear light source unit 1 are separately formed from transparent resin or the like, they are combined and integrated with an adhesive or the like. However, the present invention is not limited to this, and these can be integrally formed by molding or the like.
[0035]
Incidentally, in the linear light source 1 shown in FIG. 1 or the planar light source unit 10 shown in FIG. 3, the light emitting member 3 is composed of one LED. However, the present invention is not limited to this, and the light emitting members are arranged in a row. R, G, and B LEDs arranged can be used. FIG. 4 is a perspective view showing a configuration of a linear light source unit (1) including R, G, and B LEDs arranged in a row as the light emitting member 3. As shown in FIG. As shown in FIG. 4, the R, G, B LEDs 3r, 3g, 3b constituting the light emitting member 3 are supported by the LED substrate 31 at a position facing the end surface 2c of the linear light source unit, and the first side surface. They are arranged in a line in a direction perpendicular to 2a.
[0036]
When a predetermined drive current is individually supplied to the R, G, and B LEDs 3r, 3g, and 3b from a light-emitting member drive circuit (not shown), the LEDs 3r, 3g, and 3b individually emit light in R, G, and B colors. The light enters the light guide member 2 from the end face 2c. When the LEDs 3r, 3g, and 3b are arranged in this way, the vertical component of the incident angle with respect to the second side surface 2b is substantially the same for each color, and the light of each color that has entered the light guide member 2 has already been described. Based on the same principle as described above, the light path of each color is changed under substantially the same conditions, and illumination light with no unevenness of brightness is emitted from the first side surface 2a of the light guide member 2. The illumination light of each color of R, G, and B can illuminate the object by individually emitting a plurality of colors at the same time as necessary. As a result, it is possible to illuminate in various colors with no luminance unevenness.
[0037]
Next, FIG. 5 is a view showing a modification of the linear light source unit shown in FIG. 4, (a) is a front view, and (b) is a side view as seen from the light emitting member 3 side. As shown in FIG. 5, the R, G, and B LEDs 3r, 3g, and 3b constituting the light emitting member 3 are supported by the LED substrate 31 at a position facing the end surface 2c of the light guide member 2, and the first side surface. They are arranged in a line in a direction parallel to 2a. In the same manner as described above, the LEDs 3r, 3g, and 3b individually emit light in the colors R, G, and B, and the light enters the light guide member 2 from the end face 2c. When the LEDs 3r, 3g, and 3b are arranged in this way, the horizontal component of the incident angle with respect to the second side surface 2b is substantially the same for each color, and the light of each color that enters the light guide member 2 is the same. The light paths are changed under substantially the same conditions for each color, and the light is emitted from the first side surface 2a of the light guide member 2 as illumination light having no luminance unevenness. Thus, the linear light source 1 according to the present example also has the same effect as the linear light source (1) shown in FIG.
[0038]
【The invention's effect】
As described above, according to the present invention, in a linear light source including a long light guide member and a light emitting member such as an LED, uneven luminance of emitted light is improved, and illumination with uniform brightness is achieved. Can be possible. The present invention further eliminates the need for interposing a diffusion sheet or the like in a planar light source formed by combining such a linear light source and a planar light guide plate, improves luminance unevenness without reducing the luminance of illumination light, and is manufactured. An increase in cost can be prevented.
[Brief description of the drawings]
FIG. 1 is a diagram showing a configuration of a linear light source unit according to an embodiment of the present invention.
FIG. 2 is a diagram showing a distribution of luminance of illumination light emitted from the linear light source unit shown in FIG.
3 is a diagram showing a configuration of a planar light source unit using the linear light source unit shown in FIG. 1. FIG.
FIG. 4 is a diagram showing a configuration of a linear light source unit using R, G, and B LEDs according to another embodiment of the present invention.
FIG. 5 is a diagram showing a configuration of a modification of the linear light source unit shown in FIG. 4;
FIG. 6 is a diagram showing a configuration of a conventional linear light source unit.
7 is a diagram showing a luminance distribution of illumination light emitted from the linear light source unit shown in FIG. 6. FIG.
8 is a diagram showing a configuration of a planar light source unit using the linear light source unit shown in FIG.
FIG. 9 is a diagram showing a configuration of a known improved example related to the planar light source unit shown in FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Linear light source unit 2 Light guide member 2a 1st side surface 2b 2nd side surface 3 LED of light emitting member 3r R
3g G LED
3b B LED
4 reflective member 7 planar light guide plate 10 planar light source unit 10a first main surface 10b second main surface 11 illumination light 12 concave groove 31 LED substrate

Claims (9)

A long side light guide member that emits illumination light from the first side surface, and a light emitting member that makes light incident on the light guide member, and a second side surface that faces the first side surface of the light guide member , in a plurality of linear light source unit provided with a concave groove that reflects incident light from the light emitting member, said light emitting member is, R, G, an LED of B, the longitudinal direction of the plurality of concave grooves are the A linear light source unit characterized by crossing the direction of incident light from a light emitting member. First side for emitting illumination light, a second side opposite to the side surface of the first, the first and side surface and the second side face substantially perpendicular, these extend in a horizontal direction vertical width A long light guide member having a third side surface and a fourth side surface for partitioning the light source, and a light emitting member for making light incident on the light guide member from an end surface partitioning the longitudinal direction of the light guide member, the second aspect, the linear light source unit having a plurality of concave grooves that reflects incident light from the light emitting member, said light emitting member is, R, G, an LED of B, longitudinal of the plurality of concave grooves The linear light source unit , wherein the direction is inclined by 30 to 60 degrees with respect to the third side surface or the fourth side surface. First side for emitting illumination light, a second side opposite to the side surface of the first, the first and side surface and the second side face substantially perpendicular, these extend in a horizontal direction vertical width A long light guide member having a third side surface and a fourth side surface for partitioning the light source, and a light emitting member for making light incident on the light guide member from an end surface partitioning the longitudinal direction of the light guide member, the second aspect, the linear light source unit having a plurality of concave grooves that reflects incident light from the light emitting member, said light emitting member is, R, G, an LED of B, longitudinal of the plurality of concave grooves The linear light source unit characterized in that the direction is inclined by approximately 45 degrees with respect to the third side surface or the fourth side surface. 4. The R, G, and B LEDs are disposed so as to overlap each other in a direction substantially parallel or perpendicular to the first side surface or the second side surface. The linear light source unit described in 1. The linear light source unit according to any one of claims 1 to 4, wherein the cross-section of a plurality of concave grooves provided on the second side surface is substantially arc-shaped or V-shaped configuration. As a direct bond or integrally a flat planar light guide plate linear light source unit to the side of which emits illumination light of the planar light source unit to be incident reflected light from the second side to the planar light guide plate the linear light source unit according to any of claims 1 to 5, characterized in that. Said first side, said second side surface and the surface of said plurality of concave grooves is according to any one of claims 1 to 6, characterized in that the diffusion treatment such as mirror finishing or grain is applied Linear light source unit . The linear light source unit according to any one of claims 1 to 7 wherein the distance between the first side and the second side is characterized by a small as the distance from the light emitting member. Wherein said second side surface, or the second aspect, the adhesion or close to the third side and the fourth side, characterized in that disposed a reflective member made of reflective tape or reflecting plate the linear light source unit according to any one of claims 1 to 8.

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