JP2007314048A - Linear light emitting device - Google Patents

Abstract

An object of the present invention is to provide a linear light emitting device that emits linear light having a certain width.
A light source;
A linear light guide into which light from the light source is introduced from one end side, and includes a convex portion continuous along the longitudinal axis, and a light diffusing reflection portion over the entire width is provided on the upper surface of the convex portion at a predetermined interval. A linear light guide formed of
A linear light emitting device comprising
[Selection] Figure 4

Description

  The present invention relates to a linear light emitting device. Specifically, the present invention relates to an improvement in a light-emitting device that emits light by converting light from a light source into linear light using a light guide.

  Conventionally, a linear light-emitting device using a linear light guide is used for illumination or the like. When light is introduced into the linear light guide, the amount of light reaching the farther light source is usually smaller than in the vicinity of the light source. As a result, unevenness in the amount of light emission occurred, resulting in non-uniform linear light. Various studies have been made to solve this problem. For example, Patent Document 1 discloses an illumination device that emits linear light from the lower surface by introducing light from an end surface of a linear light guide and reflecting the light by its upper surface reflection surface. In this illuminating device, the light reflection / diffusion effect is enhanced by providing light diffuse reflection parts having a fixed shape on the upper surface reflection surface at regular intervals, or by providing light diffusion reflection parts that gradually widen away from the light source at regular intervals. . Furthermore, in order to compensate for the decrease in the amount of light reaching the light source farther, the linear light guide is made thinner as the distance from the light source increases. Other conventional techniques include linear light emitting devices disclosed in Patent Documents 2 and 3.

Japanese Patent No. 2900799 JP 2005-114894 A JP 2005-300852 A

In the conventional linear light emitting device, the light diffusive reflection action in the region away from the light source is enhanced to improve the light extraction efficiency in the region away from the light source, thereby reducing the light emission unevenness. However, the amount of light that reaches the region far from the light source is smaller than that in the vicinity of the light source. Therefore, there is a case where light emission unevenness cannot be sufficiently reduced only by enhancing the light diffusive reflection effect in a region away from the light source. This tendency becomes more remarkable as the linear light guide becomes longer. On the other hand, when the light diffusive reflecting portion is widened away from the light source, or the linear light guide is thinned away from the light source, the width of the linear light changes accordingly. That is, linear light having a certain width cannot be obtained. In addition, it is difficult to manufacture a linear light guide whose thickness changes continuously with high accuracy and high yield.
Accordingly, an object of the present invention is to solve the above problems and provide a linear light emitting device that emits linear light having a certain width. It is another object of the present invention to provide a linear light-emitting device that emits linear light having a certain width and can be manufactured with high accuracy and high yield.

In order to achieve at least one of the above objects, the present invention provides the following linear light-emitting device. That is,
A light source;
A linear light guide into which light from the light source is introduced from one end side, and includes a convex portion continuous along the longitudinal axis, and a light diffusing reflection portion over the entire width is provided on the upper surface of the convex portion at a predetermined interval. A linear light guide formed of
A linear light emitting device comprising

  In the linear light-emitting device of the present invention, light from the light source is first introduced into the linear light guide. The introduced light is reflected on the upper surface of the convex portion of the linear light guide. On the upper surface of the convex portion, light diffusing and reflecting portions over the entire width are formed at predetermined intervals. As a result, light having a certain width can be emitted from the side opposite to the convex portion. Since the light diffusing / reflecting part extends over the entire width of the upper surface of the convex part, the end (edge) in the width direction of the light diffusing / reflecting part coincides with the end of the upper surface of the convex part. Thereby, the edge of the light diffusive reflection part becomes clear. As a result, the edge of the emitted light becomes clear, that is, the cut-off of the emitted light becomes clear.

Hereinafter, components in the linear light emitting device of the present invention will be described in detail.
(light source)
Although the kind of light source is not specifically limited, It is preferable that it is an LED lamp. This is because the LED lamp is small and has advantages such as resistance to vibration and impact. The type of the LED lamp is not particularly limited, and various types such as a shell type and an SMD type can be adopted. Among them, it is preferable to use a bullet-type LED lamp. This is because the light from the cannonball type LED lamp has high directivity, so that the light can be more efficiently introduced into the linear light guide described later. The emission color of the LED lamp is not particularly limited, and an LED lamp having a desired emission color such as white, blue, red, or green can be used. A plurality of LED lamps may be used as the light source.

(Linear light guide)
Examples of the material of the linear light guide include light transmissive materials such as synthetic resins such as acrylic resin, polycarbonate resin, polyethylene terephthalate (PET), silicone resin, and epoxy resin, and inorganic materials such as glass. A linear light guide may be formed by combining these materials. Among these, it is preferable to employ an acrylic resin. This is because the acrylic resin has a small light diffusion effect and a high light guide effect. It is also preferable to employ a polycarbonate resin from the viewpoint of ensuring sufficient strength and impact resistance.

The linear light guide is arranged so that light from the light source enters from the end face thereof. The shape of the linear light guide is not particularly limited as long as it is linear with a certain width. For example, the longitudinal cross section of the linear light guide is substantially circular, substantially elliptical, triangular, quadrangular, pentagonal, hexagonal, or a combination of these shapes.
The linear light guide has a convex portion that continues along its longitudinal axis. The convex portion is composed of a side surface and an upper surface. The boundary between the side surface and the upper surface of the convex portion is preferably linear. This is because the edge of the light reflected and radiated by the upper surface of the convex portion becomes a straight line, and the parting off becomes clear as linear light. It is preferable that the convex portions are formed with the same width over the whole, and the light emitting surface of the linear light guide has a substantially circular curved cross section. That is, it is preferable that the upper surface of the convex portion is rectangular in plan view. This is because, if the width of the convex portion is made constant, the width of the light diffusing and reflecting portion also coincides with this, so that the light diffusing and reflecting portion having the same width can be formed accurately and easily. The upper surface of the convex portion may be a flat surface or a curved surface.
The size of the linear light guide and the size of the convex portion can be determined in consideration of the size of the target irradiation area. For example, the linear light guide can be formed in a cylindrical shape having a diameter of 8 mm and a length of 1 m, and the convex portion can have a constant width with an upper surface width of 2 mm. The linear light guide can be formed by a known method such as molding (extrusion molding or injection molding).

  A light diffuse reflection part is formed on the upper surface of the convex part. The light diffuse reflection portion can be formed by applying or printing a diffuse reflective paint, a light diffuse reflection process such as embossing, or applying a light diffuse reflection tape. In the case where the light diffusing and reflecting portion is formed by printing, acrylic paint, epoxy paint, urethane paint, or the like can be used. The light diffuse reflection part is formed so as to cover the entire width of the upper surface of the convex part. That is, it is formed continuously from one side parallel to the longitudinal axis to the other side of the upper surface of the convex portion. The light diffusing and reflecting portions are formed at predetermined intervals in the longitudinal axis direction. For example, it is formed so that the density of the light diffusive reflection portion increases as the distance from the light source increases. In addition, the density here refers to the ratio of the area in which the light diffusion reflection part exists in the unit region on the upper surface of the convex part. For example, when a plurality of light diffusing and reflecting portions having the same length are formed, the interval between two adjacent light diffusing and reflecting portions may be narrowed as the distance from the light source increases. If it does in this way, the density of a light diffusion reflection part will become large as it leaves | separates from a light source. The interval between two adjacent light diffusing / reflecting portions may be continuously changed or may be changed stepwise. The interval between two adjacent light diffusing and reflecting portions is not particularly limited, but can be, for example, about 0.5 to 10 mm. Further, the length of the light diffusive reflection part (the width in the longitudinal axis direction of the linear light guide) may be changed continuously or stepwise. When forming the light diffusive reflection part by embossing, the light diffuse reflection property of the light diffusive reflection part may be increased by increasing the density of the light diffusive reflection part on the distal side of the light source. In this way, it is possible to enhance the light diffusive reflection effect in the light source distal region where the amount of light tends to be insufficient, which contributes to the reduction of light emission unevenness.

  In one embodiment of the present invention, the main diffuse reflection region is formed on the upper surface of the convex portion. The main diffuse reflection region is a region including the central region in the longitudinal axis direction on the upper surface of the convex portion, and occupies most of the upper surface of the convex portion. In the main diffuse reflection region, it is preferable that the density of the light diffuse reflection portion is formed so as to increase as the distance from the light source increases. This is because, in the main diffuse reflection region, the light diffuse reflection effect in the region away from the light source is enhanced, and the luminance difference between the region near the light source and the region away from the light source is reduced. On the upper surface of the convex portion, it is preferable that the light diffuse reflection portion is not formed in the end region on the proximal side of the light source among the regions excluding the main diffuse reflection region. Since the end region on the proximal side of the light source has a large amount of light, if the light diffuse reflection part is formed in the end region on the proximal side of the light source, the light is excessively emitted and uneven light emission occurs. If the light diffuse reflection part is not formed in the end region on the light source proximal side, the light in the end region on the light source proximal side can be used as the light far from the light source, and the occurrence of such uneven light emission is prevented. Is done.

  In the linear light guide, it is preferable to provide a light reflecting layer on the end face on the distal side with respect to the light source (end face opposite to the end face where light is introduced). If the light reflection layer is provided, the light reaching the end face can be reflected into the linear light guide and used as the linear light of the linear light guide. Thereby, the utilization factor of light improves. The light reflection layer can be formed by coating or printing of a diffuse reflection material, light diffusion reflection treatment such as embossing, or applying a light diffusion reflection tape. When a light reflecting layer is provided on the end surface on the distal side of the light source, the density of the light diffusing / reflecting portion is set in the end region on the distal side of the light source in the region excluding the main diffused reflection region on the upper surface of the convex portion It is preferable to form so that it may become small as it leaves | separates. Since the light reflecting layer reflects light into the linear light guide, there is light traveling toward the end surface in the linear light guide and reflected light from the light reflecting layer at the distal end of the light source. Will be. As a result, the amount of light at the end on the distal side of the light source increases. Here, if the density of the light diffusing / reflecting portion is formed so as to decrease with increasing distance from the light source at the end portion on the distal side of the light source, the light diffusing / reflecting effect is reduced accordingly. As a result, excessive light emission at the distal end of the light source is prevented, and light emission unevenness is reduced.

  In addition to the colorless and transparent linear light guide, a colored linear light guide can also be used. For example, a colorant such as a pigment may be contained in the linear light guide. Or you may provide a color conversion layer in the lower surface (surface on the opposite side to a convex part) of a linear light guide. In this way, the light source can emit light having a color different from the original color. Instead of the entire lower surface of the linear light guide, a color conversion layer may be provided on a part thereof. The color conversion layer is formed by, for example, printing of a fluorescent material, application of a color conversion film, application of a translucent ink, application of a colored translucent tape, formation of a colored translucent resin layer, and the like. Can do.

In another embodiment of the present invention, a first light source, a second light source, a first linear light guide, and a second linear light guide are provided. The first linear light guide and the second linear light guide have the same configuration as the linear light guide described above. The first linear light guide and the second linear light guide are arranged such that their respective longitudinal axes are aligned on the same straight line and their one end faces are opposed to each other, and these opposing end faces are joined. The Furthermore, the light of the first light source is incident on the other end surface of the first linear light guide, and the light of the second light source is incident on the other end surface of the second linear light guide. With this configuration, a long linear light emitting device can be obtained. Furthermore, you may provide a light reflection layer in the junction part of a 1st linear light guide and a 2nd linear light guide.
Of the upper surface of the convex portion of the first linear light guide, the density of the light diffusive reflecting portion in the end region distal to the first light source is formed so as to decrease as the distance from the light source increases. Of the upper surface of the convex portion of the light guide, it is preferable that the density of the light diffusing / reflecting portion in the end region on the distal side with respect to the second light source is reduced so as to become smaller from the light source. That is, it is preferable to form the light diffusing and reflecting portion so as to decrease in density toward the joint portion. Since the light from both the first light source and the second light source reaches the vicinity of the joint and the amount of light increases, such a configuration prevents excessive light emission near the joint and reduces light emission unevenness.

In still another embodiment of the present invention, the light source is disposed so as to face both ends of the linear light guide. The linear light guide has a convex portion similar to that of the linear light guide described above, and a light diffusing reflection portion over the entire width is formed on the upper surface of the convex portion. The density of the light diffusing / reflecting portion is formed so as to increase from the both end faces of the linear light guide to the center of the linear light guide. According to such a light diffusing and reflecting portion, the light diffusion effect near the center with a small amount of light increases as the distance from the light sources arranged at both ends of the linear light guide increases, so that uneven light emission is reduced.
Examples of the present invention will be described below.

  FIG. 1 shows a perspective view of a vehicle 100 using a linear light emitting device 1 according to an embodiment of the present invention. The linear light emitting device 1 is installed along the side of the indoor ceiling of the vehicle 100. FIG. 2 shows a perspective view of the linear light emitting device 1. The linear light emitting device 1 includes a linear light guide 11 and a light source 2. The linear light guide 11 is made of acrylic. The light source 2 is a bullet-type white LED lamp. The light source 2 is arranged so that the light emission side faces the end face 12 of the linear light guide 11. The shape of the linear light guide 11 is a substantially cylindrical shape having a length of 1 m and a diameter of about 8 mm, and includes a convex portion 13 having a width of about 2 mm on the upper surface side as shown in the longitudinal section of FIG. The convex portion 13 is continuously formed along the longitudinal axis of the linear light guide 11. In addition, the upper surface 14 of the convex part 13 is a plane. The lower part of the linear light guide 11 (on the side opposite to the convex part 13) is a light emitting part 15. As shown in FIG. 3, the linear light emitting device 1 is installed in the casing 16. A lower portion of the casing 16 is opened, and light from the light emitting portion 15 is emitted through the opening. In addition, the linear light guide 11 is shape | molded by extrusion molding.

  FIG. 4 shows a top view of the linear light guide 11. The linear light guide 11 is directed from the light source 2 side end surface 12 toward the light source 2 distal side end surface 15 in the first section 10, the second section 20, the third section 30, the fourth section 40, the fifth section 50, the first section. It is divided into 6 sections, 7th section, 8th section, 9th section 90, 10th section 100, and 11th section 110. The lengths of the first to ninth sections 10 to 90 are each 10 cm in the longitudinal axis direction. Each of the tenth section 100 and the eleventh section 110 has a length of 5 cm in the longitudinal axis direction. The light diffuse reflection part is not formed on the upper surface 14 of the first section 10. On the upper surface 14 of the second section 20, six light diffusing and reflecting portions 21 having a length of about 8.0 mm are formed at intervals of about 8.7 mm. On the upper surface 14 of the third section 30, eight light diffusive reflecting portions 31 of about 8.0 mm are formed at intervals of about 4.5 mm. On the upper surface 14 of the fourth section 40 to the ninth section 90, ten light diffusive reflection portions 41 of about 8.0 mm are formed at intervals of 2.0 mm in each section. On the upper surface 14 of the tenth section 100, two light diffusive reflecting portions 101 of about 19.5 mm are formed at an interval of 5.5 mm. On the upper surface 14 of the eleventh section 110, two light diffuse reflection portions 111 of about 17.0 mm are formed at an interval of 8.0 mm. By forming each light diffusive reflection part as described above, if the ratio (that is, density) of the area occupied by the light diffusive reflection part in each section is seen, the ratio from the second section 20 toward the fourth section 40 Will increase. On the other hand, from the tenth section 100 to the eleventh section 110, the ratio of the area occupied by the light diffusive reflection portion decreases as the distance from the light source increases (that is, as the distance from the end face 15 increases). The light diffusing and reflecting portions 21 to 111 are formed by printing an epoxy white paint. The light diffusing and reflecting parts 21 to 111 are formed over the entire width of the convex upper surface 14 having a constant width. Thereby, the light diffuse reflection parts 21-111 can be easily made into the same width | variety, and can be accurately formed without position shift. On the other hand, no light diffuse reflection part is formed in the region indicated by the reference numerals 22, 32, 42, 102, and 112 in the upper surface 14. The end surface 15 of the linear light guide 11 opposite to the light source 2 is subjected to light reflection processing by printing with an epoxy white paint.

The light emission mode of the linear light emitting device 1 will be described below. The light emitted from the light source 2 enters the linear light guide 11 from the end face 12 of the linear light guide 11. Incident light is guided through the linear light guide 11 while being reflected by the upper surface 14. Among these, the light that has reached the light diffuse reflection parts 21 to 111 on the upper surface 14 is diffusely reflected and positively emitted from the light emission part 15 to the outside. As described above, since the light diffusing and reflecting portions 21 to 111 are accurately formed without positional deviation, the linear light diffused and reflected by the light diffusing and reflecting portions 21 to 111 has a constant line width. Furthermore, since the ends (edges) in the width direction of the light diffusive reflecting portions 21 to 111 coincide with the ends of the upper surface of the convex portion 13, the boundary in the width direction of the linear light becomes clear. Thereby, the edge of the light diffusive reflection part becomes clear. As a result, the edge of the emitted linear light becomes clear and the parting of the linear light becomes clear.
Moreover, the light diffusion reflection parts 21-41 are formed so that the ratio of the area which a light diffusion reflection part occupies from the 2nd division 20 to the 4th division 40 may be increased. Thereby, in the 2nd division 20 to the 4th division 40, the light diffusion reflection effect by the upper surface 14 will increase as it leaves | separates from the light source 2. FIG. As a result, the light extraction rate in a region far from the light source 2 where the amount of light reaching the light source is small is improved, and uneven light emission is reduced. Furthermore, since the end surface 15 is a reflecting surface, light that guides the linear light guide 11 toward the end surface 15 in the vicinity of the end surface 15 and is reflected into the linear light guide 11 by the end surface 15. There will be light and two types of light. Here, in the tenth section 100 and the eleventh section 110, which are the vicinity of the end face 15, the ratio of the area occupied by the light diffusion reflection portions 101 and 111 decreases as the end face 15 is approached. The reflection effect is reduced. Accordingly, excessive emission of light is prevented in the region near the end face 15 where two types of light exist, and light emission unevenness is reduced. Furthermore, the light diffusing reflection part is not provided in the first section 10 in the vicinity of the light source 2. As a result, light is not actively emitted to the outside in the region near the light source 2. The light that has not been emitted from the region near the light source 2 is guided through the linear light guide 11 and used as light in a region away from the light source 2. As a result, the amount of light emission in the region near the light source 2 with a large amount of light decreases, and the amount of light emission in a region away from the light source 2 with a small amount of light increases, thereby reducing light emission unevenness.

  Of the light diffusing and reflecting portions provided on the upper surface of the convex portion 13 of the linear light guide 11, the light diffusing and reflecting portions 21 to 41 have the same length, but may include light diffusing and reflecting portions having different lengths. good. Another embodiment of the length and arrangement of the light diffusing and reflecting portion is shown in FIG. As shown in FIG. 5, the linear light guide 11 has 10 cm from the end face 12 facing the light source 2 as the first section 510, and then, every 5 cm, the second section 520, the third section 530, the fourth section 540, It is divided into a fifth section 550 and a sixth section 560. The first section 510 is not formed with a light diffusing / reflecting portion. Three light diffusing and reflecting portions 521 of about 4.3 mm are formed on the upper surface 14 of the second section 520 at intervals of about 12.4 mm. Three light diffuse reflection portions 531 of about 4.8 mm are formed on the upper surface 14 of the third section 530 at intervals of about 11.9 mm. On the upper surface 14 of the fourth section 540, four light diffuse reflection portions 541 of about 3.0 mm are formed at intervals of about 9.5 mm. Four light diffusion reflection portions 551 of about 5.0 mm are formed on the upper surface 14 of the fifth section 550 at intervals of about 7.5 mm. Five light diffuse reflection portions 561 of about 4.8 mm are formed on the upper surface 14 of the sixth section 560 at intervals of about 5.2 mm. The light diffusing / reflecting parts 521 to 561 also have the same effects as the light diffusing / reflecting parts 21 to 41.

A linear light emitting device 600 according to another embodiment of the present invention will be described. In addition, the same code | symbol is attached | subjected to the member same as the linear light-emitting device 1, and the description is abbreviate | omitted. The linear light-emitting device 600 includes two linear light guides 11. FIG. 6 shows a top view of the two linear light guides 11. The two linear light guides 11 are arranged so that their longitudinal axes are on the same straight line. Further, the end faces 15 are joined to each other through the light reflecting layer 601 so that the convex portions 13 are continuous.
In the linear light emitting device 600, by using the two linear light guides 11 joined in the longitudinal axis direction, it is possible to emit longer linear light. In the vicinity of the joint between the two linear light guides 11, the light of the light source 2 is reflected into the linear light guide 11 by the light reflecting layer 201, so that the amount of light in the vicinity of the joint increases. In the tenth section 100 and the eleventh section 110, which are the vicinity of the end face 15, the ratio of the area occupied by the light diffusing and reflecting portion decreases as it approaches the end face 15, so that the light diffusing and reflecting effect decreases as it approaches the end face 15. Thus, excessive light emission is prevented in the vicinity of the end face 15. As a result, light emission unevenness is reduced.

  As still another embodiment, light may be introduced from both ends of one linear light guide 11. FIG. 7 shows the length and arrangement of the light diffusing / reflecting portions of the linear light emitting device 700 that introduces light from both ends of one linear light guide 11. The light emitting side of the light source 2 faces the end faces 12 and 15 of the linear light guide 11. The linear light guide 11 has a first section 710, a second section 720, a third section 730, a fourth section 740, a fifth section 750, a sixth section 760, a seventh section 770, approximately every 10 cm from the end face 12. It is divided into 10 sections of an eighth section 780, a ninth section 790, and a tenth section 800. In order from the both end faces 12 and 15 toward the center, the light diffusing / reflecting portion is not formed in the first section 710 and the tenth section 800. In the second section 720 and the ninth section 790, six light diffusion reflection portions 721 and 791 of about 8.0 mm are formed at intervals of about 8.7 mm. In the third section 730 and the eighth section 780, six light diffusion reflection portions 731 and 781 of about 9.5 mm are formed at intervals of about 7.2 mm. In the fourth section 740 and the seventh section 770, six light diffusion reflection portions 741 and 771 of about 11.0 mm are formed at intervals of about 5.7 mm. In the fifth section 750 and the sixth section 760, six light diffusion reflection portions 751 and 761 of about 12.5 mm are formed at intervals of about 4.2 mm. If formed in this way, the light diffusing and reflecting portions 721 to 791 are densely arranged stepwise from both ends 12 and 15 toward the center of the longitudinal axis of the linear light guide 11. The center of the longitudinal axis of the linear light guide 11 tends to have a small amount of light. However, if the light diffusing reflectors 721 to 791 are arranged in this way, the light diffuse reflection toward the center of the linear light guide 11 is performed. Since the effect is increased, unevenness in light emission is reduced.

  The linear light-emitting device of the present invention can be used as a light source for various illuminations.

FIG. 1 is a perspective view of a vehicle 100 using a linear light emitting device 1 according to an embodiment of the present invention. FIG. 2 is a perspective view of the linear light emitting device 1. FIG. 3 is a longitudinal section of the linear light guide 11. FIG. 4 is a top view of the linear light guide 11. FIG. 5 is a top view of the linear light guide 11 of another embodiment. FIG. 6 is a top view of two linear light guides 11 used in the linear light emitting device 600 of another embodiment. FIG. 7 is a top view of the linear light guide 11 of the linear light emitting device 700 of another embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 600 700 Linear light-emitting device 2 Light source 11 Linear light guide 13 Convex part 14 Upper surface 21 31 41 101 111 721 731 741 751 761 771 781 791 Light-diffusion reflection part

Claims (8)

A light source;
A linear light guide into which light from the light source is introduced from one end side, and includes a convex portion continuous along the longitudinal axis, and a light diffusing reflection portion over the entire width is provided on the upper surface of the convex portion at a predetermined interval. A linear light guide formed of
A linear light emitting device comprising:   2. The linear light-emitting device according to claim 1, wherein the convex portions are formed with the same width over the whole, and a light-emitting surface of the linear light guide has a substantially circular curved cross section.   A region excluding both ends of the linear light guide on the upper surface is a main diffuse reflection region, and in the main diffuse reflection region, the density of the light diffuse reflection portion increases continuously or stepwise as the distance from the light source increases. The linear light-emitting device according to claim 1 or 2.   The said linear light guide is a linear light-emitting device in any one of Claims 1-3 provided with a light reflection layer on the end surface of the distal side with respect to the said light source.   5. The density of the light diffusing / reflecting portion decreases continuously or stepwise as the distance from the light source increases at the end of the upper surface of the convex portion that is distal to the light source. The linear light-emitting device described in 1.   6. The linear light-emitting device according to claim 1, wherein the light diffusion reflection portion is not formed at an end portion proximal to the light source on the upper surface. A first light source;
A second light source;
A first linear light guide into which light of the first light source is introduced from one end side, the first linear light guide having a convex portion continuous along a longitudinal axis of the first linear light guide, and an upper surface of the convex portion A first linear light guide having first light diffusing and reflecting portions formed at predetermined intervals over the entire width thereof,
A second linear light guide into which light of the second light source is introduced from one end side, comprising a convex part continuous along a longitudinal axis of the second linear light guide, and an upper surface of the convex part A second linear light guide in which second light diffusing and reflecting portions over the entire width are formed at predetermined intervals,
With
An end surface distal to the first light source of the first linear light guide is joined to an end surface distal to the second light source of the second linear light guide. ,
Linear light-emitting device. A first light source;
A second light source disposed to face the first light source;
A linear light guide disposed between the first light source and the second light source, in which light from the first light source is introduced from one end side, and light from the second light source is introduced from the other end side. A convex portion continuous along the longitudinal axis, and an upper surface of the convex portion is formed with a light diffusing and reflecting portion over the entire width thereof, and the linear light guide is formed from both end faces of the linear light guide. A linear light guide whose density of the light diffusing and reflecting portion increases as it approaches the center;
A linear light emitting device comprising:

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