JP2002372631A - Wire-shaped luminous body - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a high-performance wire-shaped luminous body which is optimized in the angle distribution of exit light in a circumferential direction and is capable of radiating light from side peripheral surfaces with high directionality without loss. SOLUTION: This wire-shaped luminous body has at least a translucent rod-like body which has a light incident section at least at one end and is formed light reflecting channels having light reflecting surfaces facing this light incident section on the peripheral flank along an axial direction. The surface roughness (Ra) of the light reflecting surfaces at the light reflecting channels is <=0.5 μm. The embodiment that the light reflecting channels have the channel walls at both ends of the light reflecting surfaces is more preferable.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a linear luminous body capable of radiating light from a side peripheral surface with high directivity without loss, and more particularly, to a linear luminous light suitable as a vehicle lamp such as a room light and a vehicle tail lamp. About the body.

[0002]

2. Description of the Related Art Conventionally, neon tubes, fluorescent tubes, and the like have been known as light emitters capable of obtaining linear light emission. These neon tubes and fluorescent tubes require a high voltage, and there is a risk of electric shock or electric leakage.For example, they cannot be used in places where water, rain, or snow is present. Since the fluorescent tube is formed of a glass tube, it cannot be used in a place where a person, a car, or the like may be physically hit and damaged. In addition, when used in such a shape as to be curved into a curved surface, it is necessary to perform glasswork in accordance with the curvature, which requires skill, resulting in an increase in cost. Furthermore, neon tubes and fluorescent tubes consume a large power of about several tens of watts per meter. Therefore, when used for a long time, there is a problem that the neon tube and the fluorescent tube can be used only in a place where a commercial power supply can be used.

[0003] In recent years, to solve these problems, there has been proposed a twisted optical transmission tube or a plastic optical fiber in which a flexible tube is filled with a transparent core liquid or a flexible transparent polymer.

[0004] That is, the above proposal is to make light emitted from a light source incident on an optical transmission tube or the like and emit light from the side of the tube over a length of several tens of meters. Since it can be used, it can be used underwater, outdoors, or in an environment where there is a risk of explosion, and there is no risk of breakage. Further, complicated and cumbersome processing such as glass work is unnecessary, and workability is good. .

However, such a light transmission tube or the like emits light over a length of about several tens of meters.
A high power light source is required. In addition, for use in water or outdoors or in an environment where there is a risk of explosion for the purpose of side emission, protective measures for the light source are required, and accordingly the light source device itself becomes large and the storage space is greatly restricted. Problem.

On the other hand, as a linear luminous body that emits light from the side peripheral surface, the luminous body includes a tubular clad and a core made of a material having a higher refractive index than the constituent material of the tubular clad. A strip-shaped reflective layer is formed between the clad and the core along the longitudinal direction of the tubular clad, and light passing through the core is reflected and scattered by the reflective layer to form a tubular layer opposite to the reflective layer-formed side. In recent years, attention has been paid to an optical transmission tube that emits light from the cladding side peripheral surface (Japanese Patent Laid-Open No. 2000-3).
No. 9519).

In the light transmission tube, the reflection layer is formed in a band shape between the tubular cladding and the core along the length direction of the tube. The light is reflected by the layer and emitted as strong light with high directivity from the tube-side peripheral surface opposite to the reflective layer. Light-diffusing particles are used as a reflection layer of these linear light-emitting bodies. When light hits the light diffusing particles, the light is scattered in all directions (the length direction of the rod, the circumferential direction). In the circumferential direction, the directivity is enhanced by reducing the width of the reflective layer (the circumferential lens). Although the effect on the rod side is improved by this amount, the effect as expected was not obtained, and there was a problem that it could not be applied to products requiring extremely high luminance.

[0008]

The object of the present invention is to solve the conventional problems in such a situation and to achieve the following objects. That is, an object of the present invention is to provide a high-performance linear luminous body having improved directivity and improved luminance by reducing the surface roughness (Ra) of the light reflecting surface of the light reflecting groove and bringing it closer to a mirror surface. And

[0009]

The present invention provides the following linear illuminant to achieve the above object.

According to a first aspect of the present invention, there is provided a light transmitting apparatus having a light incident portion at at least one end and a light reflecting groove having a light reflecting surface facing the light incident portion on a circumferential side surface along the axial direction. In a linear light-emitting body having at least a conductive rod, a surface roughness (Ra) of a light reflection surface in the light reflection groove is 0.5 μm.
m or less. The invention according to claim 2 is the linear illuminator according to claim 1, wherein the surface roughness (Ra) of the light reflecting surface in the light reflecting groove is 0.3 μm or less. The invention according to claim 3 is the linear illuminator according to claim 1 or 2, wherein the light reflection groove has groove walls at both ends of the light reflection surface. According to a fourth aspect of the present invention, there is provided the linear illuminator according to any one of the first to third aspects, wherein the groove walls are arranged at both ends of the light reflecting groove so as to face each other in parallel with the axial direction of the linear illuminant. According to a fifth aspect of the present invention, there is provided the linear illuminator according to any one of the first to fourth aspects, wherein the groove wall is located in a direction substantially normal to the groove bottom. The invention according to claim 6 is the linear illuminator according to any one of claims 1 to 5, wherein the groove bottom extends substantially in the normal direction to the axial direction of the linear illuminant. The invention according to claim 7 is the linear light-emitting body according to any one of claims 1 to 6, wherein the light reflecting groove is one of a V-shaped groove and a V-shaped groove having both ends in an inverted conical shape. It is. The invention according to claim 8 is the linear light-emitting body according to any one of claims 1 to 7, wherein the apex angle of the light reflection groove is 60 to 120 degrees. According to a ninth aspect of the present invention, the linear light-emitting body has a light-transmitting clad that has a lower refractive index than the light-transmitting rod and covers the light-transmitting rod.
9. The linear light-emitting body according to any one of items 1 to 8, Claim 1
The invention according to claim 0 is the linear illuminator according to any one of claims 1 to 9, wherein the brightness of the light reflected from the light reflecting groove in a direction facing the light reflecting groove is 500 cd / m ² or more. In the invention according to claim 11, the shape of the side facing the light reflection groove side in the cross section in the direction orthogonal to the axial direction is one of a part of a perfect circle and a part of an ellipse. A linear light-emitting body according to any one of the above. The invention of claim 12 is
The linear light-emitting body according to any one of claims 1 to 11, further comprising a light-emitting body that irradiates a light incident portion of the light-transmitting rod with light. The invention according to claim 13 is the linear light-emitting body according to any one of claims 1 to 12 used as a vehicle lamp. The invention according to claim 14 is a multi-color invention.
3. The linear light-emitting body according to any one of 3.

According to the present invention, there is provided a light transmissive member having a light incident portion at at least one end and a light reflecting groove having a light reflecting surface facing the light incident portion on a peripheral side surface along the axial direction. A light reflecting surface of the light reflecting groove having a surface roughness (Ra) of 0.5 μm or less, preferably 0.3 μm or less;
By setting m or less, the light reflecting surface can be made closer to the mirror surface, and the directivity is enhanced. In particular, the angular distribution of the emitted light in the axial direction is optimized, and the line pattern with high directivity substantially perpendicular to the axial direction is obtained. And a linear illuminant excellent in safety, heat resistance, weather resistance, and cost performance can be obtained.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in more detail with reference to the drawings. FIG. 1 is a schematic cross-sectional view showing an example of a linear light-emitting body. The linear light-emitting body 10 is provided on a light-transmitting rod 1 and one end of the light-transmitting rod 1 in the longitudinal direction. The light source includes a reflector 7 and a light source 12 such as an LED arranged at the other end. In addition, 15 is a housing.

In this linear light-emitting body 10, a light source 12 (light-emitting body) is provided only at one end of the light-transmitting rod 1; in this case, it is preferable to provide a reflector 7 at the other end. In the present invention, light sources can be provided at both ends of the light-transmitting rod 1.

The shape of the side (lens portion) facing the light reflecting groove side in the cross section in the direction orthogonal to the axial direction of the light-transmitting rod 1 is appropriately determined according to the use and purpose of the linear light-emitting body. Although it can be selected, it is preferable to be either a part of a perfect circle or a part of an ellipse.

The translucent rod 1 is not particularly limited,
Although it can be appropriately selected according to the purpose, as shown in FIG. 2, a light-transmitting rod 1 having a light incident portion at at least one end, and a lower refractive index than the light-transmitting rod 1. And a light-transmitting clad 3 covering the light-transmitting rod.

As shown in FIG. 2, a large number of light reflecting grooves 8 for reflecting incident light from the light incident portion are provided on the outer peripheral surface of the light transmitting rod 1 at predetermined intervals. The light reflecting groove 8 is provided through the clad 3 so as to reach the translucent rod 1.

The light-reflecting groove 8 of the linear illuminant is shown in FIG.
As shown in (A) and (B), the light reflecting groove has a groove bottom 8.
It has both ends of the groove walls 8b, 8b intersecting a (that is, both ends of the light reflection groove are stopped). Further, it is preferable that the groove bottom 8a extends in a direction substantially normal to the axial direction of the light-transmitting rod, and the groove walls 8b, 8b are located in a direction substantially normal to the groove bottom 8a.

Further, as shown in FIGS. 4A and 4B, both ends of the groove have an inverted conical shape, and the groove walls 8b, 8b are displaced from a direction substantially normal to the groove bottom 8a. No problem.
Since the light reflecting groove has both ends having the groove wall crossing the groove bottom in this way, the groove width of the light reflecting groove 8 can be adjusted to be short, and the distribution of the emission angle in the circumferential direction can be optimized. .

As shown in FIG. 5, the light reflecting groove 8 of the linear luminous body has an axis perpendicular to the axial direction of the light transmitting rod 1 and
The angle θ between the light reflecting groove and the light reflecting surface 8c
(Degree) is preferably 30 ≦ θ ≦ 60, more preferably 40 ≦ θ ≦ 60, and still more preferably 45 ≦ θ ≦ 55. If the angle θ is too small, the distribution of the emitted light is biased toward the light source, while if too large, the distribution of the emitted light is biased toward the other end of the light source, and in any case, the directivity is reduced.
In some cases, the brightness becomes low and the object of the present invention cannot be achieved.

The cross-sectional shape of the light reflecting groove 8 is preferably a V-shape or an inverted conical shape. However, the cross-sectional shape is not necessarily required to be symmetrical in the normal direction. It is preferable to appropriately adjust the cross-sectional shape according to the number of arrangements and the like.

That is, when a light source is provided at one end of the light-transmitting rod, the angle θ (degree) gradually increases as the distance from the light incident portion increases (the light reflecting surface of the light reflecting groove is It is preferable that the inclination increases as the distance from the lens increases. Accordingly, the emission light amount distribution in the longitudinal direction of the linear light emitter is equalized.

Therefore, if the cross-sectional shape of the light reflecting groove is symmetrical in the normal direction, the apex angle of the light reflecting groove is
The angle θ is twice the angle θ. However, in the present invention, as described above, the angle formed by the light reflection groove and the normal to the light reflection surface of each light reflection groove is different, so that the apex angle of the light reflection groove is preferably Is preferably in the range of 60 ° to 120 °, particularly preferably 90 ° to 110 °.

When light sources are provided at both ends of the light-transmitting rod, the light-reflecting surface of the light-reflecting groove is preferably inclined toward the center of the light-transmitting rod. ,
The light emission distribution in the longitudinal direction of the linear light emitter is equalized.

The light reflecting groove 8 is usually provided in the state shown in FIG.
As shown in FIG. 7B, the light-transmitting rod 1 is formed so as to be located at a normal position in the axial direction of the light-transmitting rod 1. As shown in FIGS. It may be formed so as to have a slight angle from the normal line in the axial direction of the body 1. Although the light reflection groove is not shown, the light reflection groove may have an angle in a direction opposite to that of FIGS. 7A and 7B.

In the present invention, as shown in FIG.
When the light source 12 such as an LED is arranged on one side, it is preferable that the arrangement density of the light reflection grooves 8 be increased as the distance from the light source 12 increases. With this configuration, the light emission amount distribution in the longitudinal direction of the linear light-emitting body is easily equalized.

Also, as shown in FIG.
When the light sources 12 and 12 are arranged, it is preferable to increase the arrangement density of the light reflecting grooves 8 toward the center of the linear luminous body. The light emission distribution in the directions is easily equalized.

The width of the light reflecting groove is not particularly limited, but is preferably 2 to 8 mm, and the depth of the groove is preferably 0.1 to 5 mm. In this case, if a light source such as an LED is arranged on one side, the light reflection groove width increases as the distance from the light source increases,
Further, it is preferable to increase the groove depth. In addition, L
When a light source such as an ED is disposed, it is preferable that the light reflection groove width is increased and the groove depth is increased toward the center of the linear illuminant. Further, the groove interval is the position of the groove from the light source,
Although it depends on conditions such as the strength of the light source, whether the light source is provided at one end or both ends, and the length of the light-transmitting rod, it is usually preferably 0.2 to 4 mm.

The light reflecting groove can be formed by forming a convex portion corresponding to the light reflecting groove on the surface of the molding die by electric discharge machining or the like, and forming a light transmitting rod at the time of extrusion molding. Also, it can be formed by direct grinding.

In the present invention, the light reflection surface of the light reflection groove has a surface roughness (Ra) of 0.5 μm or less;
In particular, it is preferably 0.3 μm or less. in this case,
The lower limit is not particularly limited, but is preferably 0.01 μm or more. When the surface roughness (Ra) of the light reflecting surface in the light reflecting groove exceeds 0.5 μm, scattering in the length (or axis) direction of the rod becomes too large, and the object and operation and effect of the present invention can be achieved. Can not. The surface roughness (Ra) is measured according to JIS B0601.

The method for achieving the surface roughness of the light reflecting surface as described above can be achieved by polishing the light reflecting groove. The polishing method is not particularly limited, and a desired surface roughness can be obtained by sandpaper, an abrasive, or the like.

In the linear light-emitting body thus configured, light that enters from the left end face of the light-transmitting rod has a light reflection surface having a surface roughness (Ra) of 0.5 μm or less. The light is scattered by the reflection groove, and the loss from the side peripheral surface of the linear luminous body is small, the side light is efficiently radiated, and the luminance of the light reflected from the light reflection groove in the direction facing the light reflection groove is 500 cd / m ² or more. Preferably, high luminance of 600 cd / m ² or more, more preferably 800 cd / m ² or more, can be achieved.

Here, a transparent material having a higher refractive index than the material (cladding material) constituting the light-transmitting clad is used for the material constituting the light-transmitting rod-shaped body. It is appropriately selected and used according to the purpose.

Specifically, the material constituting the light-transmitting rod is preferably a solid material. For example, polystyrene, styrene / methyl methacrylate copolymer, (meth) acrylic resin, polymethylpentene, allyl Glycol carbonate resin, spirane resin, amorphous polyolefin, polycarbonate, polyamide, polyarylate, polysulfone, polyallylsulfone, polyethersulfone, polyetherimide, polyimide, diallylphthalate, fluororesin, polyestercarbonate, norbornene resin (ARTON) And a transparent material such as an alicyclic acrylic resin (Optrets), a silicone resin, an acrylic rubber, and a silicone rubber. One of these materials can be used alone, or two or more can be used in combination.

The clad material can be selected from transparent materials having a lower refractive index than the translucent rod, and examples thereof include organic materials such as plastics and elastomers.

Examples of the grading material include polyethylene, polypropylene, polymethyl (meth) acrylate, polymethyl (meth) acrylate, polyvinyl chloride, polyvinylidene chloride, polyvinyl acetate, polyethylene-vinyl acetate copolymer, and polyvinyl alcohol. ,
Polyethylene-polyvinyl alcohol copolymer, fluororesin, silicone resin, natural rubber, polyisoprene rubber, polybutadiene rubber, styrene-butadiene copolymer, butyl rubber, halogenated butyl rubber, chloroprene rubber, acrylic rubber, ethylene-propylene-diene copolymer Coalescence (EPDM), acrylonitrile-butadiene copolymer, fluororubber, silicone rubber, and the like,
One of these can be used alone or two or more can be used in combination.

Among the materials and cladding materials constituting the light-transmitting rod-shaped material, core materials such as polystyrene, polycarbonate, and styrene- (meth) are preferable in terms of transparency, optical characteristics such as refractive index, and workability. Acrylic copolymer (MS
Polymer) and the like, and as the cladding material, a (meth) acrylic polymer and the like are preferable.

The diameter of the light-transmitting rod 1 is not particularly limited, but is preferably about 2 to 30 mm, particularly preferably about 5 to 15 mm. The thickness of the translucent cladding 3 is usually preferably 0.05 to 4 mm, particularly preferably about 0.2 to 2 mm.

The method for producing such a light-transmitting rod-shaped linear light-emitting body is not particularly limited, and the light-transmitting rod-shaped material and the clad material are introduced into an extruder by a conventional method, and the light-transmitting rod is produced. It can be manufactured by an extrusion molding method or the like, in which the rod-like material is simultaneously extruded into a cylindrical shape and the clad material is extruded into a tube shape covering the light-transmitting rod-like material.

The linear luminous body of the present invention is used for the LE used for the light source.
By changing the color of D, light can be emitted in various colors, and multicoloring is possible. For example, RGB three-color LED
Is used, red (R), green (G), blue (B), white (R +
G + B), yellow (R + G), purple (R + B), and cobalt blue (G + B) can be changed in seven colors.

As described above, the linear luminous body of the present invention
The angular distribution of the emitted light in the circumferential direction is optimized, light can be radiated from the side peripheral surface with high directivity without loss, and line-shaped light emission with excellent safety, heat resistance, weather resistance, and cost performance Because the body can be realized, neon tube replacement (for example, game consoles, pachinko etc.), architectural lighting parts (for example, stairs, handrail lighting, bathtub handrails, etc.), road materials (for example, road signs, signs, stop lines, Road studs),
Auto parts (eg doors, steps, tail lamps,
Side mirrors, indoor and outdoor lighting, etc.) and toys. Among these, it is suitable for automobile parts.

Examples of use for the above-mentioned automobile parts include those shown in FIGS. FIG.
In FIG. 1 and FIG. 11, a linear light-emitting body 10 including a light-transmitting rod 1 is arranged on a side surface of a headlight 20 of an automobile. According to this, the linear light-emitting body 10 can perform multicolor display, and can also function as a blinker by blinking. In addition, 12 in FIG.
5 is a housing.

FIGS. 12 and 13 show an arrangement in which a linear light-emitting body 10 including a light-transmitting rod 1 is arranged on the back side of a folding side mirror 21 of an automobile. According to this, since the linear illuminant is excellent in design and can perform multicolor display, it can also function as a blinker by blinking. In FIG. 13, reference numeral 12 denotes a light source, and reference numeral 15 denotes a housing.

FIGS. 14 and 15 show a case where three linear light-emitting bodies 10 including the light-transmitting rods 1 are arranged in a backlight 22 of an automobile. Since the translucent rod 1 can be freely curved, it can be smoothly mounted according to the shape of the vehicle body. In addition, 12 in FIG.
Reference numeral 15 denotes a housing.

FIGS. 16 to 18 show an arrangement in which a linear light-emitting body 10 including a light-transmitting rod 1 formed in a ring shape is arranged on a headlight 23 of an automobile. FIG. 17 (A), (B)
As shown in (1), sockets 15 each having a light source 12 therein are attached to both ends of the ring-shaped translucent rod 1. Also, as shown in FIGS. 18A and 18B, cut portions are formed at two locations in the radial direction of the ring-shaped translucent rod 1, and the light source 12 is arranged in the cut portions. . 17 and 18, reference numeral 12 denotes a light source, and reference numeral 15 denotes a housing.

FIG. 19 and FIG. 20 show an example in which three linear light-emitting members 10 including the light-transmitting rod-shaped member 1 are arranged on a modified headlight 23 of a wagon vehicle. Since the translucent rod 1 can be freely curved, it can be smoothly mounted according to the shape of the vehicle body. In FIG. 20, reference numeral 12 denotes a light source, and reference numeral 15 denotes a housing.

FIGS. 21 and 22 show a high-mount stop lamp mounted on the rear of the vehicle. FIG. 21 shows a conventional high-mount stop lamp 30 of a lamp type.
FIG. 22 is a perspective view showing a state where the linear light-emitting body 10 is mounted as a high-mount stop lamp. In addition, 31 in the figure is a window glass. When the linear light-emitting body 10 of the present invention shown in FIG. 22 is used for a high-mount stop lamp, there is no protrusion compared to a conventional stop lamp, so that it takes up less space and is excellent in design.

Although the linear luminous body of the present invention has been described in detail above, the present invention is not limited to the above-described embodiment. For example, the light reflecting layer may be formed along the longitudinal direction of the outer peripheral surface of the translucent rod. May be provided, and various other changes may be made without departing from the scope of the present invention.

[0048]

EXAMPLES The present invention will be described below in detail with reference to Examples and Comparative Examples, but the present invention is not limited to the following Examples.

Example 1 and Comparative Example 1 Using a 200t injection molding machine, PMMA (polymethyl methacrylate) was used.
The pellets are placed in a rod mold having a convex portion for forming a light reflection layer along a length direction on a part of the inner surface having a diameter of 14 mm and a length of 20 cm, and a screw temperature of 220 to 240 ° C and a mold temperature of 60 ° C. Injection molding was performed to produce a translucent rod.

On the outer peripheral surface of the obtained translucent rod, a groove width of 5 mm, a groove depth of 0.5 mm, a groove interval of 3.5 mm, a number of grooves of 5
Seven V-shaped grooves are formed uniformly in the axial direction. This V-shaped groove is polished to have a surface roughness (Ra) of 0.4 μm,
One having a thickness of 0.2 μm (Example 1) and one having not been polished (surface roughness (Ra): 2 μm) (Comparative Example 1) were obtained. In addition,
The surface roughness was measured with a laser interference microscope (manufactured by Keyence Corporation).

Using four LEDs (red, HPWT-DH00) as light sources for the obtained light-transmitting rod, light was incident from one side, and the 29th groove position (10 cm from the light source side)
For the luminance viewing angle characteristic of
Degree) to ± 60 degrees from the luminance of the light emitting surface (cd
/ M ² ) was measured using a Minolta colorimeter CS100. The results are shown in Table 1 and FIG.

As for the brightness distribution (side brightness) in the axial direction (length direction), an LED (red, HPWT) is used as a light source.
−DH00), the light was incident from both ends, and the luminance of the light-emitting surface at a viewing angle of 0 ° was measured using a Minolta colorimeter CS100. The results are shown in Table 2 and FIG.

[0053]

[Table 1]

[0054]

[Table 2]

Example 2 and Comparative Example 2 The luminance viewing angle characteristics and the side luminance were measured in the same manner as in Example 1 except that an inverted conical groove was used instead of the V-shaped groove as the light reflecting groove. did. The results are shown in Tables 3 and 4 and FIGS. The inverted conical groove has a groove width of 3.0 to 4.0 mm, a groove depth of 0.5 mm,
The gap between the grooves was 3.5 mm, and the inverted conical grooves were polished to have a surface roughness (Ra) of 0.4 μm and 0.2 μm (Example 2), and were not polished (surface roughness (Ra): 2 μm) (Comparative Example 2).

[0056]

[Table 3]

[0057]

[Table 4]

[0058]

According to the present invention, by directing the light reflecting surface of the light reflecting groove to a mirror surface by polishing the light reflecting surface, the directivity is enhanced and the luminance is remarkably improved. In particular, the angular distribution of the emitted light in the axial direction is optimized. Thus, a linear luminous body with high directivity and substantially perpendicular to the axial direction can be obtained, and a linear luminous body excellent in safety, heat resistance, weather resistance and cost performance can be obtained.

[Brief description of the drawings]

FIG. 1 is a schematic sectional view showing an example of a linear illuminant of the present invention.

FIG. 2 is a schematic sectional view showing an example of a light-transmitting rod.

FIGS. 3A and 3B are a schematic cross-sectional view and a perspective view, respectively, for explaining the shape of the light reflecting groove.

FIG. 4 is (A) a schematic cross-sectional view and (B) a perspective view for explaining another shape of the light reflecting groove.

FIG. 5 is an explanatory diagram illustrating an angle between a light reflecting surface of a light reflecting groove and an orthogonal axis.

FIGS. 6A and 6B are a plan view and a side view showing an example of a light reflecting groove.

FIGS. 7A and 7B are a plan view and a side view showing an example of another light reflection groove.

FIG. 8 is a front view showing an example of the linear light-emitting body of the present invention.

FIG. 9 is a front view showing another example of the linear light-emitting body of the present invention.

FIG. 10 is a perspective view showing a usage example in which a linear illuminant is arranged on a side surface of a head ride of an automobile.

FIG. 11 is a partially enlarged view of a headlight part of FIG. 10;

FIG. 12 is a perspective view showing a usage example in which a linear illuminant is arranged on the back side of a folding side mirror of an automobile.

FIG. 13 is a partially enlarged view of a side mirror unit in FIG. 12;

FIG. 14 is a perspective view showing a usage example in which a linear light-emitting body is arranged in a backlight of an automobile.

FIG. 15 is a partially enlarged view of the backlight unit in FIG. 14;

FIG. 16 is a perspective view showing a usage example in which a ring-shaped linear light-emitting body is arranged on a headlight of an automobile.

17 (A) is an enlarged view of the linear illuminator of FIG. 16, and FIG. 17 (B) is a side view of the linear illuminator of FIG.

18A is an enlarged view of the linear illuminator of FIG. 16, and FIG. 18B is a side view of the linear illuminator of FIG.

FIG. 19 is a perspective view showing a usage example in which a linear light-emitting body is arranged in a side light of an automobile.

FIG. 20 is a partially enlarged view of a side portion in FIG. 19;

FIG. 21 is a schematic perspective view showing a conventional high mount stop lamp mounted on a rear portion of a car.

FIG. 22 is a schematic perspective view showing an example of a state in which the linear light-emitting body of the present invention is used as a high-mount stop lamp.

FIG. 23 is a graph showing a relationship between a viewing angle and luminance in Example 1 and Comparative Example 2.

FIG. 24 is a graph showing a relationship between an axial length and luminance in Example 1 and Comparative Example 2.

FIG. 25 is a graph showing a relationship between a viewing angle and luminance in Example 2 and Comparative Example 4.

FIG. 26 is a graph showing a relationship between an axial length and luminance in Example 2 and Comparative Example 4.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Translucent rod-shaped body 3 Cladding 8 Light-reflecting groove 8c Light-reflecting surface 10 Linear light-emitting body 12 Light source 15 Housing

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) F21Y 101: 02 F21Q 1/00 E

Claims (14)

[Claims] At least one light-transmissive rod-shaped body having a light incident portion at at least one end and a light reflecting groove having a light reflecting surface facing the light incident portion on a peripheral side surface along the axial direction is provided. The linear light-emitting device according to claim 1, wherein a surface roughness (Ra) of a light-reflecting surface in the light-reflecting groove is 0.5 μm or less. 2. The linear luminous body according to claim 1, wherein the surface roughness (Ra) of the light reflecting surface in the light reflecting groove is 0.3 μm or less. 3. The linear illuminator according to claim 1, wherein the light reflecting groove has groove walls at both ends of the light reflecting surface. 4. The linear illuminator according to claim 1, wherein the groove walls are disposed at both ends of the light reflecting groove so as to face each other in parallel with the axial direction of the linear illuminator. 5. The linear illuminator according to claim 1, wherein the groove wall is located in a direction substantially normal to the groove bottom. 6. The linear illuminator according to claim 1, wherein the groove bottom extends in a direction substantially normal to the axial direction of the linear illuminator. 7. The linear illuminator according to claim 1, wherein the light reflecting groove is one of a V-shaped groove and a V-shaped groove having both ends in an inverted conical shape. 8. The linear illuminant according to claim 1, wherein the apex angle of the light reflecting groove is 60 to 120 degrees. 9. The light-emitting device according to claim 1, wherein the linear light-emitting body has a light-transmitting clad that has a lower refractive index than the light-transmitting rod and covers the light-transmitting rod. A linear light-emitting body according to any one of the above. 10. The linear illuminator according to claim 1, wherein the luminance of the light reflected from the light reflecting groove in a direction facing the light reflecting groove is 500 cd / m ² or more. 11. The cross section in a direction perpendicular to the axial direction, wherein the shape of the side facing the light reflecting groove side is one of a part of a perfect circle and a part of an ellipse. 4. The linear luminous body according to 1. 12. The linear light-emitting body according to claim 1, further comprising a light-emitting body that irradiates a light incident portion of the light-transmitting rod with light. 13. The method according to claim 1, which is used as a vehicle lamp.
13. The linear light-emitting body according to any one of items 1 to 12. 14. The linear illuminant according to claim 1, which is polychromatic.