JP6809863B2 - Mounting structure of linear light guide and lighting device using it - Google Patents

Description

The present invention relates to a mounting structure of a linear light guide used for, for example, interior lighting of an automobile, and a lighting device using the same .

Conventionally, linear light emitting members have been used in, for example, lighting devices for vehicles. In such a light emitting member, light is incident from one end of a linear light guide body by a light source to cause the light guide body to emit light (for example, Patent Documents 1 and 2).

In order to emit light linearly using such a light guide, a method of arranging a light source on the end face of the light guide and emitting light incident from the end face of the light guide from the side surface of the light guide is available. There is (for example, Patent Document 3).

Further, in order to effectively inject light into such a linear body (optical fiber), a flat lens of a light emitting diode and an outer peripheral surface near the end face of the optical fiber are covered with a reflective member ( Patent Document 4).

Japanese Unexamined Patent Publication No. 2014-172449 Japanese Unexamined Patent Publication No. 2014-172450 Japanese Unexamined Patent Publication No. 2013-057294 Japanese Unexamined Patent Publication No. 2014-105563

The illuminance of the linear light guide decreases as the distance from the light source increases. Therefore, there is a limit to the length that can be used. Therefore, it has been difficult to use a long linear light guide while ensuring a desired illuminance. Moreover, it was difficult to increase the illuminance as a whole.

Further, when the linear light guide is a side-emitting optical fiber, in order to improve the efficiency of extracting light from the side-emitting optical fiber, is it possible to perform groove processing or prism processing on the light emitting portion? Alternatively, it is necessary to introduce light scattering particles into the clad layer or roughen the interface between the clad layer and the core layer. Therefore, there is a problem that man-hours are required to manufacture the linear light guide.

The present invention has been made in view of such a problem, and provides a mounting structure of a linear light guide capable of obtaining a longer emission length or improving illuminance, and a lighting device using the same. With the goal.

In order to achieve the above-mentioned object, the first invention is to fix a linear light guide in the space created by the instrument panel, the garnish, and the cover for the garnish of an automobile, and light is emitted from the gap of the resin panel for the garnish. It is a mounting structure of the linear light guide to be taken out, and the linear light guide has a covering portion in which a part of the outer peripheral surface of the side light emitting type light emitting body in the circumferential direction is covered with a flexible resin sheet, and the above. The flexible resin sheet comprises an opening in which the outer peripheral surface of the side light emitting body is exposed without being covered with the flexible resin sheet, and the flexible resin sheet is made of a material having light reflection characteristics and cushioning properties. The covering portion and the opening portion are formed continuously in parallel with the longitudinal direction of the side emitting light emitting body, respectively, and the covering portion exceeds a half circumference in the circumferential direction on the outer circumference of the side emitting light emitting body. The opening is formed to have a length of less than half the circumference in the circumferential direction on the outer circumference of the side light emitting body, and is a flexible resin sheet of the linear light guide or the linear light guide. There housed cases is the mounting structure of the linear light guide, characterized in Rukoto attached to the attachment portion of the structural member.
When the flexible resin sheet is attached to the structural member, at least a part of the flexible resin sheet is bent into a flange shape substantially perpendicular to the longitudinal direction of the side light emitting body and attached in a flat plate shape. The portion may be formed and attached to the attachment portion of the structural member by the plate-shaped attachment portion of the flexible resin sheet or the attachment hole of the flat plate-like attachment portion.
When the case is attached to a structural member, the side light emitting body of the linear light guide and the covering portion of the flexible resin sheet are covered from the outer periphery by the case, and the case is covered. A flange-shaped mounting portion is formed in the case, or a mounting hole is formed in the case, and a structural member is mounted by the flange-shaped mounting portion of the case or a mounting hole formed in the case. It may be attached to the part.
Further, the mounting structure of the linear light guide fixes the back surface of the case by the claw-shaped protrusions formed on the instrument panel and the inner surface of the cover, whereby the instrument panel, the garnish, and the cover can be attached. The linear light guide may be fixed in the space formed on the light extraction portion side by each member.
Further, the case may be housed in a state where a plurality of the side light emitting bodies are arranged side by side.

The side-emitting light emitting body may be either a side-emitting plastic optical fiber , a side-emitting glass optical fiber , or a transparent resin having a substantially circular cross section or a colored transparent resin round bar .

The side-emitting light emitter may be dispersed with fluorophore fine particles of any one of a blue phosphor, a green phosphor, a yellow phosphor, and a red phosphor.

The side light emitting body and the flexible resin sheet may be adhered to each other by a light-transmitting adhesive at the coating portion.

When the transparent resin round bar is a colored transparent resin round bar, it may be colored , for example, blue, green, yellow, or red. By coloring the round bar material of the transparent resin in this way, the design and the decorativeness can be enhanced. In particular, even when the linear light guide is not lit, it is colored with a highly decorative color, so it looks beautiful.

The surface of the opening of the side-emitting light emitter may be roughened. By roughening the surface of the opening, the efficiency of light extraction from the mounting structure of the linear light guide is improved.

It is desirable that the flexible resin sheet has a total reflectance of 90% or more and a diffuse reflectance of 90% or more as optical characteristics for visible light having a wavelength of 450 to 650 nm. As described above, since both the total reflectance and the diffuse reflectance are high, the illuminance of the linear light guide can be improved and the light can be effectively taken out from the opening of the linear light guide .

The flexible resin sheet may be a thermoplastic microfoam resin sheet made of any one of PET resin having fine bubbles, PC resin, flame-retardant PC resin, and acrylic resin.

The flexible resin sheet is made of a microfoamed resin having a foamed layer between the unfoamed layer and the unfoamed layer in the vicinity of the sheet surface of the flexible resin sheet, and the number density of bubbles in the portion excluding the unfoamed layer. Is in the range of 10 ⁹ to 10 ¹⁵ cells / cm ³ , and the average cell diameter can be in the range of 0.5 to 20 μm. The average cell diameter is preferably in the range of 0.5 to 10 μm.

The covering section, before Symbol flexible resin sheet or a portion wound around the side-emitting light-emitting element, cut-forming surface in which a plurality of cuts parallel linear is provided each other Tokoro Teifuka as the opposite Even if the opposite surface of the flexible resin sheet having the opposite surface is wound around the side light emitting body in parallel with the longitudinal direction of the side light emitting body in the direction of the notch. Good.

The flexible resin sheet is obtained by stretching a resin film containing at least inorganic particles in polyester or a resin film containing a resin incompatible with polyester to provide shock absorption to the resin film having fine bubbles inside. The soft resin sheet to be held may be attached and configured.

The side light emitting type light emitter has a bent portion at least in a part in the longitudinal direction, and the optical characteristic of the bent portion is as an optical characteristic when the coating portion is formed of a microfoamed resin sheet. The difference between the diffuse reflectance of the straight portion and the diffuse reflectance of the curved portion may be within ± 2% .

According to the first invention, since the outer peripheral surface of the side light emitting type light emitting body is covered with a flexible resin sheet having a light reflecting property so as to partially open, light is leaked from other than the opening. A linear light guide for preventing and collecting light in the opening by reflection by the flexible resin sheet wrapped around the coating, and at the same time covering the area other than the opening with the flexible resin sheet having light reflectivity. The amount of attenuation of light transmitted through the inside can be reduced. Thus, improved illumination of light to be extracted from the linear light guide, the light reaches the longer distances, the mounting structure of the linear light guide that can obtain light emission length not long is obtained.

Further, since the flexible resin sheet has a cushioning property, it is possible to prevent the occurrence of surface scratches due to contact with the object and damage due to impact when the linear light guide is installed.

Further, if the opening is formed in a straight line parallel to the longitudinal direction of the side light emitting body, the light emitting portion can be formed in a straight line. That may be a linear light guide of the mounting structure of a straight linear.

If the flexible resin sheet is any one of PET (polyethylene terephthalate) resin having fine bubbles, PC resin, flame-retardant PC resin, or microfoamed resin sheet which is a foam of acrylic resin, high reflectance is obtained. Obtainable. Further, since the flexible resin sheet has flexibility, it can be easily deformed according to the shape of the side emitting light emitting body. Further, when the flexible resin sheet is molded according to the outer shape of the side light emitting body, the side light emitting body can be easily fitted to the flexible resin sheet. Therefore, the side-emitting type illuminant can be stably held while maintaining an appropriate holding force. Further, regardless of whether the side light emitting body is a side light emitting plastic optical fiber, a side light emitting glass optical fiber, or a bar material having a substantially circular cross section of a transparent resin, scratches on the surface of the side light emitting optical fiber are prevented. be able to.

Further, as the flexible resin sheet, in terms of light reflection characteristics, a resin film-like resin sheet obtained by stretching a polyester resin sheet containing inorganic particles or a resin incompatible with polyester and having fine bubbles inside is used. You can also do it. As described above, the flexible resin sheet may be in the form of a thin film.

Further, if the covering portion is formed so as to exceed a half circumference in the circumferential direction of the side light emitting type light emitting body, light leakage from the outer peripheral portion of the side light emitting type light emitting body can be reduced and light reflection can be enhanced. Therefore, light can be effectively taken out from the opening as compared with the case where the covering portion is formed in less than half the circumference in the circumferential direction of the side emitting light emitting body. Further, when the flexible resin sheet is molded according to the outer shape of the side light emitting body, the side light emitting body can be easily held by the flexible resin sheet.

Further, as the side light emitting type light emitting body, a side light emitting type plastic optical fiber or a side light emitting type glass optical fiber can be used.

When the side light emitting type light emitter is a side light emitting type plastic optical fiber, the core material of the side light emitting type optical fiber is changed to a PMMA (Polymethyl methylate) resin having low heat resistance, and a polycarbonate (PC) resin or a modified PC is used. By using any of a resin, a nobornene resin, or a copolymerized PMMA resin which is a copolymerized resin of PMMA resin and isopropyl alcohol resin, a linear light guide having high heat resistance having a heat resistant temperature of 120 ° C. or higher can be obtained. Here, since the side-emitting plastic optical fiber having a high heat-resistant temperature tends to have a large transmission loss, it is necessary to select it in consideration of the balance between the heat-resistant temperature and the transmission loss.

When a side-emitting glass optical fiber is used as the side-emitting optical fiber, the above-mentioned plastic material is usually used as the core material of the side-emitting optical fiber, but silica-based glass can also be used. Further, as the clad material, silica-based glass or the like can be used in addition to fluororesin.

Further, by dispersing the phosphor fine particles of any one of a blue phosphor, a green phosphor, a yellow phosphor, and a red phosphor in the side-emitting type emitter, it is possible to emit light in a desired color, and the side emission can be performed. It is possible to obtain both the effects of the characteristic and the color effect that changes the color development.

When the side-emitting light emitting body is a side-emitting plastic optical fiber or a side-emitting glass optical fiber, the contact portion between the flexible resin sheet and the side-emitting optical fiber is coated with a light-transmitting adhesive. By adhering, the flexible resin sheet can efficiently reflect light.

Further, if a transparent resin round bar material is used as the side light emitting body, the cost of the side light emitting body can be significantly reduced. For this reason, a transparent resin bar having a substantially circular cross section is used as the side light emitting body, and the contact portion between the transparent resin round bar and the flexible resin sheet is adhered by a light-transmitting adhesive. It is preferable that it is. As the light-transmitting adhesive, any of acrylic, urethane, and epoxy can be applied. Here, the refractive index of the adhesive used is 1.50 for the acrylic adhesive, 1.49 for the urethane adhesive, and 1.55 for the epoxy adhesive. By using an adhesive, the presence of the air layer is eliminated, so that light can be easily taken out, and the light taken out from the transparent resin bar to the adhesive layer can be reflected by the flexible resin sheet.

Further, by coloring the round bar material of the transparent resin, both the side emission characteristics and the color rendering effect of changing the color development can be obtained. For example, a transparent resin round bar material in which any of a blue phosphor, a green phosphor, a yellow phosphor, and a red phosphor in which phosphor fine particles are dispersed can be used to color the transparent resin.

Further, the light extraction efficiency can be improved by roughening the surface of the opening of the side light emitting body.

Further, as the optical characteristics of the flexible resin sheet in the visible light region with a wavelength of 450 to 650 nm, the total reflectance is 90% or more and the diffuse reflectance is 90% or more, and both the total reflectance and the diffuse reflectance are increased. The optics of the linear light guide can be improved and the light can be effectively taken out from the opening.

Further, by using a thermoplastic microfoamed resin sheet made of any of PET resin having fine bubbles, PC resin, flame-retardant PC resin, and acrylic resin as the material of the flexible resin sheet, excellent light reflection is achieved. You can get the characteristics. From the viewpoint of cost and versatility, it is desirable to use PET resin.

The flexible resin sheet is made of a microfoamed resin having a foamed layer between the unfoamed layer and the unfoamed layer in the vicinity of the sheet surface of the flexible resin sheet, and the number density of bubbles in the portion excluding the unfoamed layer. Is in the range of 10 ⁹ to 10 ¹⁵ cells / cm ³ , and the average cell diameter can be in the range of 0.5 to 20 μm.

As for the thickness of the microfoamed resin sheet, the thickness of the flexible resin sheet can be used from 0.2 mm to 1.2 mm, and the reason is that the thickness of the flexible resin sheet is 0.2 mm or less. This is because the light transmission loss becomes large, and when the thickness of the flexible resin sheet is 1.2 mm or more, molding is difficult even if thermal roll molding or cutting processing is performed, and the material is wasted. In addition, thermal roll molding and cutting are performed at 0 . It is preferably 6 mm or less, and more preferably 0.4 mm or less. Further, since the unfoamed layer has higher rigidity than the foamed layer, the thickness of the unfoamed layer is preferably in the range of 10 to 35 μm, preferably 10 to 25 μm.

The flexible resin sheet is formed by a thermal roll in the shape of a side-emitting light emitting body, or is formed by providing a notch at a predetermined depth parallel to the back surface of the flexible resin sheet. In the case, the flexible resin sheet has a thickness of 1.2 mm because the covering portion can be easily formed by winding the flexible resin sheet around the outer periphery of the side light emitting body. It may be.

Further, by forming the flexible resin sheet by attaching a soft resin sheet having shock absorption to a stretched film having fine bubbles inside, the same effect as a resin sheet using microfoamed resin can be obtained. Can be done.

Further, if the side light emitting body of the linear light guide has a bent portion, the flexible resin sheet adheres to the side light emitting body. Further, since the reflectance of the flexible resin sheet hardly changes even if it is bent at a curved portion, even if it is a linear light guide having a curved portion, it is used in the same manner as a linear linear light guide. can do.

Further, if at least a part of the flexible resin sheet is bent into a flange shape substantially perpendicular to the longitudinal direction of the side light emitting body to form a flat plate-shaped mounting portion, the flat plate-shaped mounting portion or the flat plate-shaped mounting portion is formed. It can be easily attached to the attachment portion of the structural member by using the attachment hole of. Here, it is desirable that the flange-shaped mounting portion is provided at a predetermined angle substantially perpendicular to the center line of the opening of the side light emitting body.

Further, if the linear light guide is housed in a case having an opening that can be stored so as to cover the covering portion, the linear light guide can be easily arranged at a desired place. Further, by arranging a flexible resin sheet between the case and the side light emitting body, the light emitted from the side light emitting body is reflected by the flexible resin sheet, and the light is absorbed by the case. The intensity of the extracted light can be adjusted while preventing and controlling the area of the opening.

In this case, it is desirable that the case is made of a flexible soft resin, rubber, or a thermoplastic elastomer. For example, the linear light guide can be inserted in the longitudinal direction of the case, but the linear light guide can also be press-fitted by widening the opening of the case.
Further, by storing a plurality of side-emitting light emitters in a case, it is possible to improve the design and decoration. Further, since the flange-shaped mounting portion or the mounting hole is formed in the case, the linear light guide can be easily mounted.

The mounting structure of the linear light guide is a mounting structure for an automobile garnish, and the linear light guide is fixed in the space created by the instrument panel, the garnish, and the cover, and light is emitted from the gap of the resin panel for the garnish. It may be taken out.
According to the mounting structure of the linear light guide of the present invention, the linear light guide is provided by a flat plate-shaped mounting portion provided on the covering portion, a flange-shaped mounting portion provided on the case, or a mounting hole provided on the case. , It is securely attached to the attachment part of the structural member.
If the mounting structure of the linear light guide is a mounting structure for automobile garnish, the linear light guide takes out light from the gap of the resin panel for garnish in the space created by the instrument panel, garnish, and cover. Can be done. At this time, the linear light guide can be press-fitted into a gap in the installation space, or can be attached to a predetermined position with a screw using an attachment hole formed in the case body.

Further, the mounting structure of the linear light guide of the present invention is a mounting structure for an automobile garnish fixed to the space created by the instrument panel, the garnish, and the cover, and is attached to the inner surface of the instrument panel and the cover. The linear light guide is fixed to the space formed on the light extraction portion side by the instrument panel, the garnish, and each member of the cover by the formed claw-shaped protrusions, and the gap between the resin panels for the garnish is fixed. Light can be extracted from.
At this time, the space for accommodating the linear light guide is the space for the linear light guide when the linear light guide is arranged in the space by devising the shape of each member of the instrument panel, the garnish, and the cover. By designing to match the shape, the linear light guide can be made into a shape that does not shift. Further, the instrument panel and the cover may be provided with the claw-shaped protrusions, and may be fixed by the claw-shaped protrusions in the space formed by the claw-shaped protrusions and the three members. At this time, the space formed by the claw-shaped protrusions and each member matches the dimensions of the case.

The second invention is a lighting device using the mounting structure of the linear light guide according to the first invention , and the mounting structure includes the linear light guide and a light source, and the side light emitting type. From one or both end faces in the longitudinal direction of the illuminant, light of a predetermined wavelength is incident by the light source in accordance with the optical axis of the side illuminant type illuminant, and the light extracted from the opening is a resin panel for garnish. It is a lighting device using a mounting structure of a linear light guide, which is characterized in that it can be taken out from the gap between the two.

The end face of the side light emitting body and the light source are brought into contact with each other for direct optical connection , or a lens is arranged between the end face of the side light emitting body and the light source and optical connection is performed through the lens. You may.

When the side lighting end face of the light-emitting body and a lens between the light source is Ru is arranged, by placing such a lens, from the time the light source to be able to efficiently enter the light into the light guide Can efficiently absorb the heat of the lens.

The end portion of the light source and the side emitting light emitting body and the connecting portion extending from the light source to the end portion of the side emitting light emitting body may be covered with a light reflecting member.

The lighting device using the mounting structure of the linear light guide may be any of a decorative lighting device , an automobile interior lighting device, a railway vehicle lighting device, and an aircraft lighting device.

According to the second invention, it is possible to obtain a lighting device using a mounting structure of a linear light guide that is brighter and longer than the conventional one.

When light is incident from one of the longitudinal directions of the side light emitting body, a reflective film may be formed on the other end face. By forming a reflective film on the other end, it is possible to prevent light from leaking from the other end.

Further, by injecting light from both ends, a brighter and longer lighting device can be obtained.

Further, the light may be directly incident on the light source in contact with the end face of the side-emitting optical fiber, or may be emitted through a lens.

Further, by covering the connecting portion extending from the light source to the end portion of the side emitting light emitting body with a light reflecting member, light leakage from the connecting portion can be prevented and heat can be dissipated.

The lighting device using such a linear light guide mounting structure can be applied to any one of, for example, a decorative lighting device , an automobile interior lighting device, a railway vehicle lighting device, and an aircraft lighting device.

According to the present invention, it is possible to provide a mounting structure of a linear light guide capable of obtaining a longer emission length or improving the illuminance, and a lighting device using the same .

The exploded perspective view which shows the linear light guide 1. The assembly perspective view which shows the linear light guide 1. A cross-sectional view perpendicular to the longitudinal direction of the linear light guide 1. FIG. 5 is a cross-sectional view perpendicular to the longitudinal direction of the linear light guide 11. (A) is a perspective view showing the linear light guide 10, and (b) is a cross-sectional view perpendicular to the longitudinal direction of the linear light guide 10. (A) is a perspective view showing the linear light guide 10a, and (b) is a cross-sectional view perpendicular to the longitudinal direction of the linear light guide 10a. (A) is a perspective view showing the linear light guide 11a, and (b) is a cross-sectional view perpendicular to the longitudinal direction of the linear light guide 11a. (A) is a perspective view showing the linear light guide 11b, and (b) is a cross-sectional view perpendicular to the longitudinal direction of the linear light guide 11b. (A) is a perspective view showing a linear light guide 10b, and (b) is a perspective view showing a linear light guide 10c. (A) is a perspective view showing the linear light guide 10d, and (b) is a cross-sectional view perpendicular to the longitudinal direction of the linear light guide 10d. (A) is a perspective view showing the linear light guide 10e, and (b) is a cross-sectional view perpendicular to the longitudinal direction of the linear light guide 10e. The figure which shows the mounting structure 25 of a linear light guide. (A) is a diagram showing the lighting device 30, and (b) is a diagram showing the lighting device 30a. (A) is a diagram showing a lighting device 30b, and (b) is a diagram showing a lighting device 30c. The figure which shows the lighting apparatus 30d. The figure which shows the relationship between the distance from a light source and the illuminance.

<Linear light guide>
(First Embodiment)
Hereinafter, the linear light guide 1 according to the embodiment of the present invention will be described. FIG. 1 is an exploded perspective view of the linear light guide 1, FIG. 2 is an assembled perspective view of the linear light guide 1, and FIG. 3 is a cross-sectional view perpendicular to the longitudinal direction of the linear light guide 1.

The linear light guide 1 is mainly composed of a side light emitting body, a flexible resin sheet 5, and the like. In the present embodiment, the side-emitting optical fiber 3 is a side-emitting optical fiber 3 which has flexibility and in which light incident on the core 2a is emitted from the side surface via a clad 2b.

The side-emitting optical fiber 3 is an optical fiber that transmits visible light over a short distance, is inexpensive, has a large core diameter, is easily connected to a device connected to the optical fiber, and is relatively light for its diameter. , Side emitting plastic optical fiber can be used. In this case, polymethyl methacrylate resin (PMMA resin) or polycarbonate resin (PC resin) is used as the core material in consideration of high refractive index, transparency, strength and the like. When heat resistance is required, it is desirable to use PC resin instead of PMMA resin.

Further, as the clad material, a fluororesin (fluoride polymer) having a low refractive index is usually used. When the thickness of the clad layer is reduced, the light leakage from the core material tends to increase. Therefore, in order to extract light from the side surface as in the present invention, it is desirable that the clad layer is thin.

It is also possible to form a side-emitting plastic optical fiber using only PMMA, which is the core material, to form an air clad. In this way, when the side-emitting optical fiber is composed of only the core material, it is desirable to roughen the surface of the optical extraction portion of the side-emitting optical fiber in order to improve the light extraction efficiency from the surface. ..

As such a side-emitting plastic optical fiber, a multimode fiber which is an SI type (step index type) and uses PMMA having excellent light transmission as a core material is desirable in terms of cost and the like. Here, as the side-emitting optical fiber, an optical fiber in which the core material and the clad material are made of silica-based glass can also be used. Silica-based glass may be used as the core material, and a fiber using fluororesin may be used as the clad material.

Further, as the side-emitting plastic optical fiber, for example, a plastic optical fiber that roughens the surface of the core 2a to scatter light and extract light to the outside can be used.

Here, when the interface between the core 2a and the clad 2b is roughened, part of the light transmitted through the side-emitting plastic optical fiber is omnidirectional from the surface of the clad 2b in various directions due to the unevenness of the interface. It is released. Further, while a part of the light reaching the roughened portion is repeatedly reflected at the interface between the core 2a and the clad 2b, the reflection angle at the roughened portion of the interface changes, and the reflection angle changes the internal propagation angle. When the angle changes beyond that, it is released from the clad layer.

By using such a side-emitting plastic optical fiber, light can be efficiently extracted from the side surface (circumferential surface) of the side-emitting plastic optical fiber.

(Side emitting plastic optical fiber with irregularities formed at the interface between the core and clad)
As a method of roughening the interface between the core 2a and the clad 2b to form irregularities, a known method such as a hot stamping method, an ultrasonic stamping method, a blast forming method, or an etching method is used to form the core 2a and the clad 2b. A side-emitting plastic optical fiber having an uneven surface formed by roughening the interface can be obtained.

(Side emitting plastic optical fiber with a light diffusion layer between the core and clad)
It may be a plastic optical fiber in which a light diffusing layer is provided between the clad 2b on the outer periphery of the core 2a, or a plastic optical fiber in which a fine diffusing material is dispersed in the clad 2b.

Here, a side-emitting nanostructure is formed by forming a structural irregularity at the interface between the core 2a and the clad (outer circumference of the core 2a) or by providing a light diffusing layer on the clad 2b on the outer periphery of the core 2a. Can be done.

Further, in particular, by forming an oriented crystal structure in the clad 2b by a specific stretching process, light scattering can be caused, and thus improvement in side emission performance can be achieved. As the light diffusing resin forming the light diffusing layer, it is desirable to use a crystalline and translucent resin. In this case, by performing twisting in addition to stretching, microbend scattering can be generated at the interface, and light scattering at the inconsistent portion at the interface between the core 2a and the clad 2b can be increased.

(Side emitting plastic optical fiber with a diffusion layer in which a light diffusing material is dispersed in a clad)
As a method of forming a diffusion layer in which an inorganic light diffusing material is dispersed in the clad 2b, an inorganic light diffusing material such as titanium oxide, zinc oxide, calcium carbonate, silica, alumina, and talc having a particle size of about 1 to 5 μm is formed on the clad 2b. Can be added. It is also possible to add organic fine particles such as silicone resin.

Here, in general, it is desirable to form a diffusion layer on the clad 2b in order to extract light from the side surface of the optical fiber, but a diffusion layer is also formed on the core 2a and the light is scattered by the diffuser. The light passing through the clad 2b from the core 2a may be increased.

As the side-emitting optical fiber 3, a known side-emitting plastic optical fiber can be used, and for example, "Ray Milky Flex 35" (trade name) manufactured by Sumitomo 3M Ltd. can be used. Here, it is preferable to use a side-emitting optical fiber in which a light diffusing layer is provided between the core 2a and the clad 2b, or a diffusing layer in which a light diffusing material is dispersed is formed on the clad 2b.

(Side emitting glass optical fiber with a gas-filled layer between the core and clad)
Further, as the side-emitting optical fiber 3, a side-emitting glass optical fiber can also be used. In this case, in order to positively emit light from the surface of the optical fiber, a nanostructure that scatters light from the core 2a to the clad 2b in the optical fiber is introduced into the optical fiber, or a geometry is formed at the interface between the core 2a and the clad 2b. It is conceivable to provide a scientifically uneven structure.

In the case of a side-emitting glass optical fiber, it is difficult to process the glass surface, and it is difficult to apply a method of forming an uneven shape on the surface of the core 2a to roughen the surface. A method is adopted in which a light-diffusing gas-filled region is provided at the interface of the clad 2b to scatter light.

These gas-filled regions can be provided by drawing a gas-impregnated raw material. The size of the cross section in these gas-filled regions can be set, for example, in the range of 10 μm to 1 μm. Further, the length of the gas-filled region can be formed to a length of 1 mm to 50 m by drawing a line.

In the case of a side-emitting glass optical fiber, it is desirable to make the core diameter larger than that of a silica glass fiber for communication in order to increase the amount of light taken into the side-emitting glass optical fiber.

As the side-emitting glass optical fiber, a known side-emitting glass optical fiber can be used, and "Fibrance Light-Diffusing Fiber" (trade name), which is a light diffusing optical fiber manufactured by Corning Co., Ltd., can be used. .. In addition to the commercially available optical fiber described above, any side-emitting optical fiber can be used.

Further, by coloring the side-emitting plastic optical fiber or the side-emitting glass optical fiber, both the effects of the side-emitting characteristics and the color rendering effect of changing the color development can be obtained. For example, a side-emitting optical fiber in which any of a blue phosphor, a green phosphor, a yellow phosphor, or a red phosphor in which phosphor fine particles are dispersed can be applied.

(End face treatment of side-emitting plastic optical fiber)
Further, when a side light emitting plastic optical fiber is used as the side light emitting type optical fiber 3, it is desirable that the end face of the side light emitting plastic optical fiber is treated in advance. Further, in order to efficiently inject light into the side-emitting plastic optical fiber, the provided layer is provided by providing a layer having a refractive index different from that of the base material on the end surface of the side-emitting plastic optical fiber on the light source side. A known antireflection film that reduces the reflected light may be formed by reversing the phases of the reflected light on the surface and the reflected light at the interface between the base material and canceling each other out. Further, the optical axis of the light source and the end face of the side-emitting plastic optical fiber may be slightly shifted for optical connection.

As the end face treatment on the end face opposite to the light source of the side-emitting plastic optical fiber, there are a hot plate method and a polishing method in which the mirror surface of the metal plate is transferred to the hot plate. In addition, as the end face treatment method, there are a free cut method and a hot cut method in terms of finished surface accuracy. Here, the surface of the metal plate is usually plated in order to obtain high smoothness.

When using the light guide, the end of the side-emitting plastic optical fiber becomes the emission end of the light guided by the side-emitting plastic optical fiber, so that the end surface of the light guided through the side-emitting plastic optical fiber It is necessary to increase the reflectance of. Further, since the end portion of the side-emitting plastic optical fiber is also an incident end when viewed from the light source side, it is desirable to form an antireflection film at the end portion of the side-emitting plastic optical fiber treated with an end face.

(Transparent resin round bar as side-emitting light emitter)
A transparent resin round bar may be used as the side light emitting body. By using a transparent resin round bar material, it is possible to significantly reduce the cost of the side light emitting body. Acrylic resin is preferably used for the transparent resin round bar, but PET resin or PC resin can also be used.

Further, by coloring the round bar material of the transparent resin, both the side emission characteristics and the color rendering effect of changing the color development can be obtained. For example, a transparent resin round bar material in which any of a blue phosphor, a green phosphor, a yellow phosphor, and a red phosphor in which phosphor fine particles are dispersed can be used to color the transparent resin.

Further, as the side-emitting type illuminant, a transparent resin bar having a substantially circular cross section is used, and the contact portion between the transparent resin round bar and the flexible resin sheet is adhered with a light-transmitting adhesive. You may. As the light-transmitting adhesive, any of acrylic, urethane, and epoxy can be applied. Here, for example, the thickness of the adhesive applied to the surface of the transparent resin round bar is in the range of several tens of μm to 1.0 mm. The thickness of the adhesive layer is preferably 0.05 mm to 0.5 mm, and more preferably 0.1 mm to 0.2 mm.

Here, the difference in refractive index between the transparent resin round bar and the adhesive is preferably 0.15 or less, and more preferably 0.10 or less. If the difference between the two is too large, the light sent to the inside of the transparent resin will be too efficient to take out the light, and it will not be possible to take out the light while emitting a long distance to the tip of the linear light guide. Because. As long as the difference in refractive index of the transparent resin from the round bar material is within the above range, an adhesive other than the above can be used as the transparent adhesive having light transmittance.

In the present invention, as the side light emitting body, one having a diameter of 2 mm to 12 mm can be used. Considering that a bent portion of the side light emitting body is formed, the upper limit is 12 mm. The reason is that if it exceeds 12 mm, it becomes difficult to bend the side light emitting body. From the viewpoint of bendability, the diameter of the side light emitting body is preferably 4 to 10 mm, more preferably about 4 to 8 mm.

(Flexible resin sheet)
Next, the flexible resin sheet 5 will be described. The flexible resin sheet 5 is preformed into a shape corresponding to the outer surface shape of the side light emitting optical fiber 3. The flexible resin sheet 5 is formed of, for example, a microfoamed resin sheet (a porous member having a large number of fine bubbles). The flexible resin sheet 5 is made of a material having light reflection characteristics and cushioning properties.

(Micro foam resin sheet)
The flexible resin sheet 5 is a micro-foamed resin sheet having a foamed layer between the non-foamed layer and the non-foamed layer near the sheet surface, and the number density of bubbles in the foamed layer excluding the non-foamed layer is 10 ⁹ to 10 ^15. it is preferably in the range of / cm ^3. Here, the bubble number density of the foam layer is in the range of ¹⁰ 9 ^{to 10 15} / cm ³ has a reflectance bubble number density is less than 10 ⁹ / cm ³ is ^{lowered, 10} 15 cm ³ This is because if the number exceeds the number, light is transmitted and the reflectance is lowered.

Further, the microfoamed resin sheet preferably has an average cell diameter in the range of 0.2 μm to 40 μm. Here, if the average cell diameter is smaller than 0.2 μm, the light transmittance becomes high and the reflectance decreases. If the average cell diameter is larger than 40 μm, the diffuse reflectance will decrease, so the average cell diameter should be in the range of 0.2 μm to 40 μm. Further, the average cell diameter is preferably 0.5 μm to 20 μm, more preferably 0.5 μm to 10 μm.

Considering the wrapping property of the microfoamed resin sheet, the sheet thickness of the microfoamed resin is 0 in the usable range of 0.2 mm to 1.2 mm from the viewpoint of ease of forming the covering portion. A thickness of .2 mm to 0.6 mm is preferred.
If the thickness of the unfoamed layer of the microfoamed resin sheet is thick, the rigidity becomes high and molding becomes difficult. Therefore, it is desirable that the thickness of the unfoamed layer of the microfoamed resin sheet is thin. Therefore, the thickness of the unfoamed layer is preferably in the range of 10 to 35 μm, preferably in the range of 10 to 25 μm.

The thickness of the microfoamed resin sheet is preferably selected as appropriate according to the diameter of the side light emitting body. Needless to say, when the diameter of the side light emitting body is large in the range of 2 mm to 12 mm, the sheet thickness of the microfoamed resin sheet can also be thickened in the range of 0.2 mm to 1.2 mm.

The flexible resin sheet 5 can be formed into the shape of a side-emitting light emitting body by a heat roll. Further, it is also possible to form a plurality of cuts having a predetermined depth parallel to each other on the back surface of the flexible resin sheet 5. Even if the flexible resin sheet 5 provided with the notch is wound around the side light emitting body by aligning the notch direction parallel to the longitudinal direction of the side light emitting body and turning the surface opposite to the cut forming surface inside. Good. Even if the flexible resin sheet is thick, it can be easily wound around the outer periphery of the side-emitting light emitting body by molding with a thermal roll or forming a plurality of cuts, so that it can be used.

The microfoamed resin sheet is made of a thermoplastic resin, and has optical characteristics for visible light having a wavelength of 450 to 650 nm: total reflectance of 90% or more, diffuse reflectance of 90% or more, and wavelength dependence of reflectance of 2% or less. It is within the range of 1% or less. The total reflectance is preferably 95% or more, and the diffuse reflectance is also 95% or more. As described above, since both the total reflectance and the diffuse reflectance are high, the illuminance of the light guide can be improved and the light can be effectively taken out from the opening.

The microfoamed resin sheet is preferably composed of a thermoplastic microfoamed resin sheet made of any one of PET resin having fine bubbles, PC resin, flame-retardant PC resin, and acrylic resin.

As described above, by using the microfoamed resin sheet as the flexible resin sheet 5, the flexible resin sheet is used when the side light emitting optical fiber 3 is fitted into the molded flexible resin sheet 5. Due to the repulsive force (shape holding force) of 5, the side light emitting type optical fiber 3 can be stably held while maintaining an appropriate holding force. Further, even when the side-emitting plastic optical fiber is used as the side-emitting optical fiber 3, the microfoamed resin sheet covers the side-emitting optical fiber 3 because it has an appropriate holding force and cushioning property due to the foamed structure. It is possible to prevent the surface from being scratched when the surface is scratched. Further, even if the side-emitting optical fiber 3 is impacted for some reason, the side-emitting optical fiber 3 can be prevented from being damaged.

If the side-emitting optical fiber 3 can be held, the flexible resin sheet 5 and the side-emitting optical fiber 3 do not necessarily have to be adhered to each other. When the flexible resin sheet 5 and the side-emitting optical fiber 3 are adhered to each other, the flexible resin sheet 5 and the side-emitting optical fiber 3 have light transmission at a contact portion (coating portion 7). It may be adhered with a transparent adhesive. As the transparent adhesive, for example, acrylic type, urethane type, epoxy type and the like can be applied.

(Stretched resin sheet, etc.)
The flexible resin sheet applied in the present invention is not limited to the microfoamed resin sheet described above, and for example, a stretched polyester sheet containing inorganic particles or a polyester sheet containing a resin incompatible with polyester may be used. It may be a film-like resin sheet in which fine bubbles are formed by stretching. By stretching the resin sheet in which the inorganic substance is dispersed in this way, fine pores can be formed. In this case, since the resin film does not have sufficient rigidity, it is desirable to perform the above-mentioned adhesion.

That is, the flexible resin sheet is formed by stretching a resin film containing at least inorganic particles in polyester or a resin film containing a resin incompatible with polyester to form a resin film having fine bubbles inside. A soft resin sheet having shock absorption may be attached to the resin film. Here, as the polyester sheet containing the inorganic particles, for example, E60L manufactured by Toray Industries, Inc. can be used.

As the polyester sheet, it is desirable to use a polyester sheet having both total reflectance and diffuse reflectance of 90% or more, preferably 95% or more when the reflectance of the aluminum oxide standard plate is 100%. As a composite resin sheet in which a resin sheet having shock absorption such as a thermoplastic elastomer, a foamed resin sheet, or a soft resin sheet is attached to a stretched polyester sheet or an incompatible resin sheet containing these fine inorganic particles. Can be used.

Here, as shown in FIG. 3, a portion of the outer peripheral surface of the side-emitting optical fiber 3 (side-emitting light-emitting body) in the circumferential direction is covered with the flexible resin sheet 5. And. Further, the portion where a part of the outer peripheral surface of the side light emitting optical fiber 3 is exposed without being covered with the flexible resin sheet 5 is defined as the opening 9. At this time, it is desirable that the covering portion 7 is formed so as to exceed a half circumference in the circumferential direction on the outer circumference of the side light emitting optical fiber 3. That is, it is desirable that the length of the opening 9 in the circumferential direction is less than half of the circumference of the side light emitting optical fiber 3 in the circumferential direction.

If the covering portion 7 is formed so as to wrap the side light emitting type optical fiber 3 so as to exceed the circumferential half circumference of the side light emitting type optical fiber 3, the shape holding force of the flexible resin sheet 5 is utilized. , The flexible resin sheet 5 can be easily attached to the side light emitting optical fiber 3. Further, by narrowing the opening 9 to less than half a circumference, it is possible to limit the portion where light leaks from the outer peripheral surface of the side light emitting optical fiber 3. Further, the flexible resin sheet 5 having a high light reflectance is diffusely reflected toward the opening 9, so that the light extracted from the opening 9 can be uniformly extracted and the light having high illuminance can be extracted. Further, since it is possible to prevent light leakage from other than the opening 9, it is possible to guide the light guided to the side light emitting optical fiber 3 to a farther distance.

The coverage of the covering portion 7 on the outer peripheral surface of the side light emitting optical fiber 3 is preferably 60% or more and 80% or less. If the coverage is 60% or more, the side-emitting optical fiber 3 can be reliably gripped. Further, by increasing the coverage, the intensity of the light extracted from the side-emitting optical fiber 3 can be increased. On the other hand, by increasing the coverage, the width of the opening 9 is reduced accordingly. Therefore, the line width of the linear light guide 1 is narrowed, and the decorative effect is impaired. Therefore, it is desirable that the coverage of the covering portion 7 is 80% or less.

In the linear light guide 1, the covering portion 7 is formed in a substantially linear shape continuously parallel to the longitudinal direction of the side light emitting optical fiber 3. That is, the openings 9 are formed in a substantially linear shape continuously parallel to the longitudinal direction of the side light emitting optical fiber 3. Therefore, the linear light guide 1 can emit light in a linear manner.

As described above, the surface of the side-emitting optical fiber 3 in the opening 9 of the linear light guide 1 may be roughened in order to improve the light extraction property.

Further, a bent portion may be formed at least in a part in the longitudinal direction of the side light emitting optical fiber 3 (linear light guide 1). If the side-emitting optical fiber 3 has a bent portion, the flexible resin sheet 5 is in close contact with the side-emitting optical fiber 3. Further, even if the flexible resin sheet 5 is bent at the curved portion, the difference in the diffuse reflectance of the bent portion with respect to the diffuse reflectance of the straight portion fluctuates by about ± 2%, and there is almost no change. Even if the shape light guide 1 has a bent portion, it can be used in the same manner as in the case of a linear shape.

Here, if the side-emitting light emitting body is a side-emitting plastic optical fiber or a side-emitting glass optical fiber, the optical fiber itself has flexibility, so that it can be easily bent. Further, when the side light emitting type light emitting body is made of a bar material of a light transmitting resin, the bent portion of the linear light guide 1 can be easily bent by bending it in warm water of, for example, 70 to 80 ° C. Or may be formed by injection molding. It can also be bent by press bending or bender bending. For example, the linear light guide is formed to have a diameter of 2 to 12 mm, but in consideration of bendability, the diameter of the linear light guide is preferably 2 to 10 mm, more preferably 2 to 8 mm.

(Second Embodiment)
FIG. 4 shows a cross-sectional view perpendicular to the longitudinal direction of the linear light guide 11 using the transparent resin round bar member 4 in the second embodiment. In FIG. 4, instead of the side light emitting optical fiber 3, a light-transmitting transparent resin round bar 4 is used as the side light emitting body, and the covering portion 7 of the side light emitting body is a flexible resin sheet 5. It has a structure covered with.

In the first embodiment, the configuration, effects, and the like of the invention when the side-emitting optical fiber is used have been described, but in the second embodiment, instead of the side-emitting optical fiber, as shown in FIG. A light-transmitting transparent resin round bar 4 is used as a side-emitting light emitter. Further, in the covering portion 7, the flexible resin sheet 5 and the transparent resin round bar 4 are adhered to each other with a light-transmitting adhesive 6. With the above configuration, the light-transmitting transparent resin round bar 4 can be used as the linear light guide 11 of the present invention.

As described above, according to the present embodiment, the side light emitting optical fiber 3 is partially covered with the flexible resin sheet 5 so as to exceed a half circumference in the circumferential direction, so that the light passes through the linear light guide. Since the amount of attenuation due to light leakage is reduced, the illuminance as linear illumination can be improved. In addition, it can emit light up to a longer distance.

Further, by using the microfoamed resin sheet for the flexible resin sheet 5, since the flexible resin sheet 5 has a certain degree of shape retention, the side light emitting optical fiber 3 can be held with an appropriate holding force. it can. In particular, by coating the flexible resin sheet 5 so as to exceed a half circumference in the circumferential direction of the side-emitting optical fiber 3, the side-emitting optical fiber 3 can be easily fitted into the flexible resin sheet 5. At the same time, the side-emitting optical fiber 3 can be protected from impact and scratches.

(Third Embodiment)
Next, a third embodiment will be described. FIG. 5A is a perspective view of the linear light guide 10, and FIG. 5B is a cross-sectional view perpendicular to the longitudinal direction of the linear light guide 10. The linear light guide 10 has almost the same configuration as the linear light guide 1, except that the side-emitting optical fiber 3 and the like are housed in the case 13.

The linear light guide 10 is a case 13 in which various side-emitting light emitters described above are housed. In the illustrated example, the side emitting optical fiber 3 (linear light guide 1) is housed in the case 13, but any of the side emitting optical fibers 3 described above is housed in the case 13. You may. Further, the shape of the case 13 is not limited to the illustrated example.

The case 13 is made of a flexible soft resin. A groove is formed in the case 13 according to the outer shape of the side light emitting optical fiber 3. The side light emitting optical fiber 3 is housed in the groove of the case 13. In addition to the soft resin, rubber, a thermoplastic elastomer, or the like can also be used for the case 13.

Here, the flexible resin sheet 5 is always arranged between the case 13 and the side-emitting optical fiber 3. That is, the inner surface of the groove of the case 13 is entirely covered with the flexible resin sheet 5, the side light emitting type illuminant and the flexible resin sheet 5 are housed in the case 13, and the covering portion 7 is surrounded by the case 13. Covered from. Therefore, the light from the side-emitting optical fiber 3 is not applied to the inner surface of the case 13.

The case 13 and the linear light guide (flexible resin sheet 5) are adhered to each other with, for example, an adhesive.

It should be noted that the case 13 may contain not only one side-emitting optical fiber 3 but also a plurality of side-emitting optical fibers 3. FIG. 6A is a perspective view of the linear light guide 10a, and FIG. 6B is a cross-sectional view perpendicular to the longitudinal direction of the linear light guide 10a.

The linear light guide 10a is housed in the case 13 in a state where a plurality of (two as an example) side light emitting optical fibers 3 are attached. That is, in the present embodiment, a plurality of linear light guides 1 are provided side by side. A plurality of linear light guides 1 are installed side by side and adhered to each other. At this time, the respective openings 9 are arranged so as to face in the same direction. Therefore, a plurality of linear bodies are formed by the openings 9 of the plurality of linear light guides 1. When a plurality of side-emitting optical fibers 3 are made to emit light, a plurality of linear light can be emitted.

In the case of the linear light guides 10 and 10a provided with a plurality of side-emitting optical fibers 3, it is desirable to provide a resin cover on the light extraction portion.

According to the third embodiment, the same effects as those of the first embodiment and the second embodiment can be obtained. Further, since the side-emitting optical fiber 3 is held in the case 13, the linear light guides 10 and 10a can be easily installed in a desired portion. Further, since the light emitting portion has a structure similar to that of the plurality of linear light guides 1, it is possible to emit light in a wider range.

When the side light emitting optical fiber 3 is housed in the case 13, the flexible resin sheet 5 acts as a cushion layer at the time of fitting (press fitting). Therefore, the side-emitting optical fiber 3 can be stably held while maintaining an appropriate holding force, and the surface of the side-emitting optical fiber 3 can be prevented from being scratched.

(Fourth Embodiment)
Next, a fourth embodiment will be described. FIG. 7A is a perspective view of the linear light guide 11a using the transparent resin round bar material, and FIG. 7B is a perspective view of the linear light guide 11a using the transparent resin round bar material 4. It is sectional drawing which is perpendicular to the longitudinal direction. The linear light guide 11a has almost the same configuration as the linear light guide 10, but the transparent resin round bar 4 is housed in the case 13 instead of the side light emitting optical fiber 3, and the transparent resin round bar 4 is housed in the case 13. The difference is that the light-transmitting adhesive 6 is applied to the coating portion 7 covered with the flexible resin sheet 5 on the outer periphery of the fourth.

Other configurations such as the material of the case 13 and the shape of the groove formed in the case are the same as those of the second embodiment. As shown in FIGS. 8 (a) and 8 (b), a plurality of transparent resin round bar members 4 are housed in the case 13, and the flexible resin sheet 5 is fixed by the light-transmitting adhesive 6. May be done. According to the fourth embodiment, the same effect as that of the third embodiment can be obtained.

<Mounting structure of linear light guide I>
(Fifth Embodiment)
Next, a fifth embodiment will be described. FIG. 9A is a perspective view of the linear light guide 10b. The linear light guide 10b has almost the same configuration as the linear light guide 1, but differs in that a flat plate-shaped mounting portion 15 is provided. The side ends of the flexible resin sheet 5 are bent so as to open on both sides. That is, at least a part of the flexible resin sheet 5 is bent into a flange shape substantially perpendicular to the longitudinal direction of the side light emitting body to form the flat plate-shaped mounting portion 15.

The flat plate-shaped mounting portion 15 is formed on the outer peripheral surface of the side-emitting optical fiber 3 so as to face in opposite directions. It is desirable that the flat plate-shaped attachment portions 15 on both sides are formed on the same plane.

As described above, the linear light guide 10b having the flat plate-shaped mounting portion 15 can be attached to the mounting portion of the structural member by the flat plate-shaped mounting portion 15. That is, it is possible to obtain a mounting structure of a linear light guide in which the flat plate-shaped mounting portion 15 and the structural member in the installation target portion are joined by adhesion or the like.

As the mounting structure of the linear light guide, a mounting hole 17 formed in the flat plate-shaped mounting portion 15 may be used as in the linear light guide 10c shown in FIG. 9B. For example, the mounting hole 17 formed in the flat plate-shaped mounting portion 15 can be joined to the structural member in the installation target portion by using a fixing member such as a bolt.

According to the fifth embodiment, the same effect as that of the first embodiment can be obtained. Further, by bending a part of the flexible resin sheet 5 to provide the flat plate-shaped mounting portion 15, it is easy to mount the flexible resin sheet 5 on the installation target. In this way, the flexible resin sheet 5 can be used for protecting the reflector and the side-emitting optical fiber 3 and as a mounting portion at the time of mounting.

<Mounting structure of linear light guide II>
(Sixth Embodiment)
Next, the sixth embodiment will be described. 10 (a) is a perspective view of the linear light guide 10d, and FIG. 10 (b) is a cross-sectional view. The linear light guide 10d has almost the same configuration as the linear light guide 10a and the like, except that the case 13 is provided with a mounting hole 19.

The case 13 projects on both sides of the side-emitting optical fiber 3. That is, the width of the case 13 is sufficiently large with respect to the outer diameter of the side-emitting optical fiber 3. Mounting holes 19 are provided at predetermined intervals in the longitudinal direction at the portions protruding from both sides of the side light emitting optical fiber 3 of the case 13. The mounting hole 19 penetrates the case 13.

As described above, the linear light guide 10d having the attachment hole 19 can be attached to the attachment portion of the structural member by the attachment hole 19. For example, the mounting hole 19 allows a fixing member such as a bolt to be joined to the structural member in the installation target portion. That is, it is possible to obtain a mounting structure of a linear light guide in which the mounting hole 19 and the structural member in the installation target portion are joined by a bolt or the like.

Further, as in the linear light guide 10e shown in FIGS. 11A and 11B, flange-shaped mounting portions 23 may be provided at both ends in the width direction of the case 13. The flange-shaped mounting portion 23 is formed so as to project to both sides in the width direction of the case 13. The flange-shaped mounting portion 23 is thinner than the other portions of the case 13.

The flange-shaped mounting portion 23 is provided with mounting holes 19 at predetermined intervals in the longitudinal direction. The mounting hole 19 penetrates the flange-shaped mounting portion 23. The mounting hole 19 is not always necessary, and only the flange-shaped mounting portion 23 may be formed. By using the flange-shaped mounting portion 23, the flange-shaped mounting portion 23 and the structural member in the installation target portion can be joined by, for example, adhesion.

The flange-shaped mounting portion 23 may be provided on the lower surface side instead of being formed on the upper surface side of the case 13. That is, the upper surface of the flange-shaped mounting portion 23 may be formed on the same surface as the upper surface of the case 13, or the lower surface of the flange-shaped mounting portion 23 may be formed on the same surface as the lower surface of the case 13. Further, the flange-shaped mounting portion 23 may be formed in the middle of the case 13 in the thickness direction.

According to the sixth embodiment, the same effect as that of the fifth embodiment can be obtained. Further, by providing the flange-shaped mounting portion 23 or the mounting hole 19 in a part of the case 13, it is easy to mount the case 13 on the installation target.

As described above, in the fifth and sixth embodiments, the side light emitting optical fiber 3 has been described, but the transparent resin round bar 4 illuminates the covering portion 7 coated with the flexible resin sheet 5. Both may be fixed by applying a permeable adhesive 6. The same effect as that of the fifth and sixth embodiments can be obtained by having the structure in which the transparent resin round bar 4 is housed in the same case 13 as in each of the fifth and sixth embodiments. Therefore, even when these transparent round bar members 4 having light transmittance are used, they are included in the fifth and sixth embodiments.

The mounting structure of the linear light guide described above may be, for example, a mounting structure for an automobile garnish. FIG. 12 is a schematic view showing the mounting structure 25 of the linear light guide. The mounting structure 25 of the linear light guide is a mounting structure for an automobile garnish. The instrument panel 27 and the garnish 29 are arranged with a gap 26. The instrument panel 27 and the garnish 29 are, for example, resin panels.

A cover 28 is provided on the back side of the instrument panel 27. The linear light guide 11a is arranged in the space surrounded by the instrument panel 27, the garnish 29, and the cover 28. More specifically, the case 13 is formed into a shape suitable for the shape of the space 32 surrounded by the instrument panel 27, the cover 28, and the garnish 29. The shape of the space 32 is formed so that the linear light guide 11a does not shift by devising the shape of each member itself. If necessary, the linear light guide 11a may be fixed by providing the claw-shaped protrusions 12 on the inner surface of each member.

A transparent resin round bar member 4, a flexible resin sheet 5, and the like are housed in the case 13. In this state, the linear light guide 11a is arranged in the space 32. The linear light guide 11a may be pushed into the space 32 and fixed. At this time, it is desirable that the space 32 is formed in a shape that does not shift when the linear light guide 11a is arranged. Here, including the space formed by the claw-shaped projection 12 and each member, the shape of the space 32 is treated as being formed so as not to shift when the linear light guide 11a is arranged.

In the illustrated example, the case 13 containing the transparent resin round bar 4 is formed in a shape suitable for the space formed by the claw-shaped protrusion 12, the instrument panel 27, the garnish 29, and the cover 28. Although the example in which the linear light guide 11a fixed to the case 13 is applied is shown, other linear light guides can also be applied. For example, the linear light guide 10b having the flat plate-shaped mounting portion 15 described above may be used.

In this case, the flat plate-shaped mounting portion 15 of the linear light guide 10b may be fixed to the mounting portion on the back side of the instrument panel 27, which is the structure to be fixed, by adhesion or the like. Alternatively, the linear light guide to the instrument panel 27 or the like may be fixed by a method other than adhesion. In addition to the above, it goes without saying that the light guide mounting structure for automobiles can be mounted at different positions of different structures such as the inside of a door panel for automobiles.

In this state, when light is incident on the side-emitting optical fiber 3 of the linear light guide 10b, the light is emitted from the opening 9 of the linear light guide 10b. Since the opening 9 of the linear light guide 10b is directed in the direction of the gap 26, light is taken out from the gap between the instrument panel 27 and the garnish 29. That is, light can be extracted from the gaps in the resin panel for garnish.

<Lighting device using a linear light guide mounting structure >
Next, a lighting device using the mounting structure of the linear light guide will be described. Hereinafter, for the sake of simplicity, the lighting devices of FIGS. 13 to 15 using the mounting structure of the linear light guide will be simply referred to as a lighting device. FIG. 13A is a conceptual diagram showing the lighting device 30. The lighting device 30 includes a linear light guide 10 and a light source 31 and the like. In the following description, an example in which the linear light guide 10 is used will be described, but other linear light guides and the like can also be applied.

A light source 31 is provided on one end surface of the side light emitting optical fiber 3 in the longitudinal direction. The light source 31 incidents light having a predetermined wavelength on the side-emitting optical fiber 3 in accordance with the optical axis of the side-emitting optical fiber 3, and the incident light is repeatedly reflected inside the side-emitting optical fiber 3. However, some light is taken out of the opening 9 while propagating towards the other end face. The light source 31 comes into contact with the end surface of the side-emitting optical fiber 3 and is directly optically connected to the side-emitting optical fiber 3.

The light taken out from the side-emitting optical fiber 3 to the coating portion 7 is diffusely reflected by the coating portion 7 and returned to the side-emitting optical fiber 3, and as a result, scattered light is emitted from the opening 9. Can be taken out. That is, for example, by increasing the coverage of the covering portion 7, it is possible to confine the light in a narrow range in the circumferential direction and extract stronger light from the opening 9.

For example, a PMMA-based plastic optical fiber has a low loss at a wavelength of 570 nm to 650 nm, so it is desirable to use an LED light emitting element as the light source 31.

In addition to the LED light emitting element, the light source 31 includes, for example, a red semiconductor laser made of an AlGaInP-based quaternary mixed crystal that emits light in the visible light region of 650 nm, an AlGaInN-based blue laser using an AlGaInN-based mixed crystal, and the like. A semiconductor laser can be used.

As the LED light emitting element, it is desirable to use a bullet-shaped LED light emitting element having high directivity of LED light emission. For example, the orientation angle, which is the angular distribution of the light emission intensity of a flat LED, is generally 120 °, but the bullet-shaped LED has a lens-shaped resin mold, for example, the orientation angle is designed to be 20 to 30 °. It is preferable to use a bullet-shaped LED because it can be used.

Here, after the light source 31 and the linear light guide 10 are optically connected, it is desirable to fix them to each other while maintaining the positional relationship between them so that the light bonding efficiency does not decrease. Further, the light source 31 may be housed in the case 13.

Further, as in the lighting device 30a shown in FIG. 13B, a lens 35 is arranged between the light source 31 and the end surface of the side-emitting optical fiber 3, and the side-emitting optical fiber is interposed through the lens 35. 3 and the light source 31 may be optically connected. In this way, when the light emitted from the light source 31 is incident on the side light emitting optical fiber 3 by using the lens 35, the LED light emitting element does not have to be a bullet type, and a normal LED light emitting element is used. Can be used.

It is desirable to use a lens 35 and a multimode fiber having a large core diameter for the optical connection between the light source 31 and the linear light guide 10. The reason for this is that multimode fiber is less affected by axial misalignment than single mode fiber is used.

Further, for the linear light guide, in terms of transmission loss, it is preferable to use a fiber having a small reflection loss and a large diameter. As the large-diameter fiber, for example, a fiber having a diameter of 8 mmΦ to 12 mmΦ is used. However, the loss due to bending becomes larger as the bending radius is smaller (the degree of bending is larger) and the diameter of the core 2a is larger. Therefore, it is desirable to use a light guide having a bent portion in which the diameter of the side light emitting body is not so large.

A reflective film 33 is formed or end face treatment is applied to the other end face (the side where the light source 31 is not provided) in the longitudinal direction of the side light emitting optical fiber 3. The reflective film 33 is, for example, a metal film. By providing the reflective film 33, it is possible to prevent light leakage from the end face.

Further, light sources 31 may be arranged at both ends of the side-emitting optical fiber 3 as in the lighting device 30b shown in FIG. 14A. In this case, the reflective film 33 is not formed. In the lighting device 30b, each light source 31 comes into contact with each end surface of the side-emitting optical fiber 3 and is directly optically connected to the side-emitting optical fiber 3.

Further, as in the lighting device 30c shown in FIG. 14B, the light source 31 and the lens 35 may be arranged at both ends of the side-emitting optical fiber 3. Also in this case, the reflective film 33 is not formed. In the lighting device 30c, a lens 35 is arranged between the light source 31 and the end surface of the side-emitting optical fiber 3, and the side-emitting optical fiber 3 and the light source 31 are optically connected via the lens.

Also in the lighting devices 30b and 30c, light of a predetermined wavelength is incident on the end face of the side-emitting optical fiber 3 from the light source 31 in accordance with the optical axis of the side-emitting optical fiber 3, so that light is emitted from the opening 9. Can be taken out. That is, light can be emitted according to the shape of the opening 9.

At this time, in the lighting devices 30b and 30c in which the light sources 31 are arranged at both ends of the side emitting optical fiber 3, the respective lights from the light sources 31 arranged at both ends of the side emitting optical fiber 3 are directed to the opposite light sources 31. Since the light is guided toward the side and the light from each light source 31 is superimposed inside the side emitting optical fiber 3, the side emitting optical fiber is compared with the case where the light source 31 is arranged only at one end. It is possible to prevent a decrease in the light source in 3.

As described above, in the invention of the lighting device, although not particularly shown, the side-emitting optical fiber 3 of FIGS. 13 (a) and 13 (b), FIG. 14 (a), and FIG. 14 (b) side-emitting optical fiber 3 Instead of, a transparent resin round bar 4 is used, and a flexible resin sheet 5 is wound around a part of the outer periphery of the transparent resin round bar 4 to form a covering portion 7 and adhered to the covering portion 7. The agent 6 may be applied to fix the transparent resin round bar 4 and the flexible resin sheet 5. That is, the light source 31 may be arranged at one end or both ends of the transparent resin round bar 4 in the longitudinal direction. An LED lighting device having such a structure can also obtain the same effect as when a side-emitting optical fiber is used, and can be included in the lighting device of the present invention.

Further, as in the lighting device 30d shown in FIG. 15, the end portion of the light source 31 and the side emitting optical fiber 3 and the connecting portion extending from the light source 31 to the end portion of the side emitting optical fiber 3 are formed by the light reflective member 37. It may be covered. As such a light-reflecting member 37, for example, a thin plate made of stainless steel or aluminum can be used. Further, depending on the case, a resin material having silver or aluminum deposited on the surface or a resin material having silver plating or aluminum plating may be used.

In FIG. 15, instead of the side-emitting optical fiber 3, the outer periphery of the transparent resin round bar 4 is covered with a flexible resin sheet 5, and the covering portion 7 covered with the flexible resin sheet 5 transmits light. The same effect can be obtained by adhering with the sex adhesive 6.

Even in this case, the light source 31 may be arranged on one end surface of the side-emitting optical fiber 3 or may be arranged at both ends. Further, the lens 35 may be arranged between the light source 31 and the side-emitting optical fiber 3.

Also in the lighting device 30d, light is extracted from the opening 9 by injecting light of a predetermined wavelength from the light source 31 onto the end face of the side emitting optical fiber 3 in accordance with the optical axis of the side emitting optical fiber 3. Can be done. That is, light can be emitted according to the shape of the opening 9. Further, by covering the connecting portion extending from the light source 31 to the end portion of the side light emitting optical fiber 3 with the light reflecting member 37, light leakage from the connecting portion can be prevented and heat can be dissipated.

The LED light emitting element can be appropriately selected from white, yellow, red, blue, green and the like according to the purpose of use. The color development may be selected by directly changing the emission wavelength of the LED light emitting element or by using phosphor fine particles to obtain various colors.

Here, as described above, the color development may be changed by changing the emission wavelength of the LED light emitting element, but phosphor particles may be used.

As phosphor fine particles having a wavelength conversion function, for example, a green phosphor capable of converting blue light into yellow light, a yellow phosphor capable of converting blue light into yellow light, and blue light in order from the short wavelength side. Examples include a red phosphor capable of converting light into red light. In this way, the fluorophore fine particles of any of the blue phosphor, the green phosphor, the yellow phosphor, and the red phosphor may be dispersed in the core 2a or the clad 2b of the side-emitting optical fiber 3.

As the green phosphor, there is Ca ₃ Sc ₂ Si ₃ O ₁₂ , and the emission wavelength of the phosphor is 480 to 620 nm (peak wavelength 515 nm) with respect to the GAN-based blue LED light that emits the excitation light at 445 nm to 460 nm. It becomes. As the yellow _phosphor, there is Y ₃ Al _{5 O 12,} the emission wavelength of the phosphor becomes 520～680Nm (peak wavelength 540~570nm). Further, as the red phosphor, there is CaAlSiN ₃ , and the emission wavelength of the phosphor is 580 to 720 nm (emission peak wavelength 630 to 660 nm). In addition, for example, nitride phosphors such as CaAlSiN ₃ : Eu and CaSiN ₂ : Eu can be mentioned.

In addition to the above, an LED light emitting element having a light emitting peak at 360 nm to 480 nm is used, and a light conversion member such as a light transmissive paint or a light conversion sheet is used to convert the color tone from red to orange. There is a way. For example, here, the light conversion paint is a paint containing a red to orange pigment, an acrylic resin, an additive, and an organic solvent. Here, as a general coating film component, various resins such as acrylic resin, urethane resin, melamine resin, and polycarbonate resin can be used.

As described above, according to the lighting device of the present invention, the flexible resin sheet 5 prevents light leakage from the side-emitting optical fiber 3 and suppresses light attenuation, so that the illuminance is high and a long distance is emitted. It becomes possible to make it.

Further, various emission colors can be obtained by selecting the LED light emitting element and combining the phosphor fine particles.

The lighting device using the mounting structure of the linear light guide of the present invention is particularly suitable for , for example, decorative lighting measures , automobile interior lighting devices, railroad vehicle lighting devices, aircraft lighting devices, and the like.

The illuminance was evaluated for the lighting device using the linear light guide of the present invention and the lighting device using the linear light guide without the flexible resin sheet.

(Example 1)
As the side-emitting optical fiber, a side-emitting plastic optical fiber manufactured by PMMA was used. Specifically, Ray Milky Flex (trade name) (Φ3.5 mm ± 0.2 mm) manufactured by Sumitomo 3M Ltd. was used. The core is made of a special acrylic resin, and the clad is made of a fluororesin.

The flexible resin sheet is MC-PET (trade name) manufactured by Furukawa Denki Kogyo Co., Ltd. with a thickness of 0.3 mm, and the visible light region when the total reflectance of the aluminum oxide standard plate is 100%. As the light reflectance in the above, those having a total reflectance of 98% and a diffuse reflectance of 98% were used. As shown in FIG. 2, the flexible resin sheet is vertically attached at a coverage rate of 52% so that a part of the flexible resin sheet is opened on the outer periphery of the side light emitting optical fiber and the opening is formed substantially linearly. did.

An LED light emitting element was directly contacted with one end of the linear light guide without using a lens to make an optical connection. As the LED light emitting element, a model LP-B56A511A (blue 470 nm, 5φ cannonball type LED light emitting element, drive current of 20 mW) manufactured by LED & Application Technology was used. A reflective film is not formed on the other end of the side light emitting optical fiber.

(Comparison example)
The configuration was the same as that of Example 1 except that the flexible resin sheet was not used.

FIG. 16 is a diagram comparing the relationship between the distance from the light source and the illuminance for both Example 1 and Comparative Example. Line A in the figure is the result of Example 1, and line B in the figure is the result of Comparative Example.

In any case, the illuminance decreases as the distance from the light source increases, but the illuminance in Example 1 (line A) is higher in any position as compared with the comparative example (line B). That is, sufficient illuminance could be secured from a position far from the light source. For example, when compared at a distance that can secure an illuminance of 1.0 Lux or more, in the comparative example, the distance is about 30 cm, whereas in the first embodiment, the illuminance of 1.0 Lux or more is secured up to about 90 cm, which is about three times that distance. Was done. Comparing the illuminances of both Example 1 and Comparative Example 1 at the same distance from the light source, for example, at a distance of about 90 cm from the light source, the illuminance of Comparative Example 1 is 0.1 Lux. The illuminance of Example 1 was 1 Lux, which was 10 times the illuminance of Comparative Example 1.

(Example 2)
A multi-core plastic optical fiber was used instead of the side-emitting optical fiber of Example 1. Other conditions were the same as in Example 1. The sea part (resin surrounding each core) was made of vinylidene fluoride resin, and the clad was made of fluoride polymer of fluoride methacrylate polymer. The occupancy rate of the core in the optical fiber cross section was 80%. A light diffusing material was used between the core and the clad in order to improve the light extraction efficiency.

In Example 2, as in Example 1, when the illuminance with and without the flexible resin sheet was compared, the illuminance of the example of the present invention using the flexible resin sheet was higher at any position. Sufficient illuminance could be secured from the light source to a position far away.

(Example 3)
Instead of the side-emitting optical fiber of Example 1, a rod made of PMMA was used. The flexible resin sheet was vertically attached so as to cover a part of the outer circumference of the PMMA bar in the circumferential direction. Further, in the third embodiment, a red LED having a wavelength of 635 nm and a peak current of about 5 mW is used as the LED light source, and in order to improve the efficiency of extracting light from the PMMA bar, it is flexible with the PMMA bar. The conditions were the same as in Example 1 except that the sex resin sheet was bonded with a transparent adhesive.

In Example 3, as in Example 1, when the illuminance with and without the flexible resin sheet was compared, the example of the present invention using the flexible resin sheet had a PMMA rod as the light emitting body. The illuminance was high at any position, and sufficient illuminance could be secured from the position far from the light source.

(Example 4)
Instead of the flexible resin sheet of Example 1, a composite resin sheet in which a resin sheet having shock absorption was attached to a stretched polyester film manufactured by Toray Industries, Inc. in which inorganic particles were added to polyester was used. An aluminum oxide plate having a total reflectance of 95% and a diffuse reflectance of 95% was used.

In Example 4, as in Example 1, when the illuminance with and without the flexible resin sheet was compared, the illuminance of the example of the present invention using the flexible resin sheet was higher at any position. Sufficient illuminance could be secured from the light source to a position far away.

(Example 5)
The fluorophore particles were dispersed in the side-emitting optical fiber of Example 1. As the phosphor fine particles, Ca ₃ Sc ₂ S _i3 O ₁₂ was used to color the 460 nm blue LED to green. Similarly, the 460nm blue LED to rendering _yellow, was used Y ₃ Al _{5 O 12.} Evaluation was made using a linear light guide in which each fluorescent particle fine particle was dispersed.

In Example 5, as in Example 1, when the illuminance with and without the flexible resin sheet was compared, the illuminance in the example of the present invention using the flexible resin sheet was higher at any position. Sufficient illuminance could be secured from the light source to a position far away.

(Example 6)
A plurality of linear light guides of the first embodiment were arranged side by side and adhered to each other, and housed in a case to form a linear light guide as shown in FIG. A white LED was used as the LED light source.

In Example 6, as in Example 1, when the illuminance with and without the flexible resin sheet was compared, the illuminance of the example of the present invention using the flexible resin sheet was higher at any position. Sufficient illuminance could be secured from the light source to a position far away.

Although the embodiment of the present invention has been described above with reference to the attached drawings, the technical scope of the present invention does not depend on the above-described embodiment. It is clear that a person skilled in the art can come up with various modifications or modifications within the scope of the technical ideas described in the claims, and these are naturally within the technical scope of the present invention. It is understood that it belongs.

For example, it goes without saying that the configurations in each of the above-described modifications can be combined with each other.

1, 10, 10a, 10b, 10c, 10d, 10e, 11, 11a, 11b ……… Linear light guide 2a ……… Core 2b ……… Clad 3 ……… Side emitting optical fiber 4 ……… Transparent Resin round bar 5 ………… Flexible resin sheet 6 ………… Adhesive 7 ………… Coating 9 ………… Opening 12 ………… Claw-shaped protrusion 13 ………… Case 15 ………… Flat plate Mounting parts 17, 19 ………… Mounting holes 23 ………… Flange-shaped mounting part 25 ………… Linear light guide mounting structure 26 ………… Gap 27 ………… Instrument panel 28 ………… Cover 29 ………… Garnish 30, 30a, 30b, 30c, 30d ……… Lighting device 31 ………… Light source 32 ………… Space 33 ………… Reflective film 35 ………… Lens 37 ………… Light reflective member

Claims (19)

It is a mounting structure of the linear light guide that is fixed in the space created by the instrument panel, garnish, and cover for the garnish of the automobile, and the light is taken out from the gap of the resin panel for the garnish.
The linear light guide has a coating portion in which a part of the outer peripheral surface of the side light emitting body in the circumferential direction is coated with a flexible resin sheet and the side surface without being covered with the flexible resin sheet. It is provided with an opening in which the outer peripheral surface of the light emitting body is exposed.
The flexible resin sheet is made of a material having light reflection characteristics and cushioning properties.
The covering portion and the opening portion are formed continuously in parallel with the longitudinal direction of the side emitting light emitting body, respectively, and the covering portion exceeds a half circumference in the circumferential direction on the outer circumference of the side emitting light emitting body. The opening is formed to have a length of less than half the circumference in the circumferential direction on the outer circumference of the side light emitting body .
Flexible resin sheet or said linear light guide is a plastic case, a linear light guide mounting structures characterized by Rukoto attached to the attachment portion of the structural member of the linear light guide. When the flexible resin sheet is attached to the structural member, at least a part of the flexible resin sheet is bent into a flange shape substantially perpendicular to the longitudinal direction of the side light emitting body and attached in a flat plate shape. The linear light guide according to claim 1, wherein a portion is formed and the flexible resin sheet is attached to a mounting portion of a structural member by a flat plate-shaped mounting portion or a mounting hole of the flat plate-shaped mounting portion. Mounting structure. When the case is attached to a structural member, the side light emitting body of the linear light guide and the covering portion of the flexible resin sheet are covered from the outer periphery by the case.
The case is formed with a flange-shaped mounting portion, or the case is formed with a mounting hole.
The mounting structure for a linear light guide according to claim 1, further comprising mounting the case on a mounting portion of a structural member by means of the flange-shaped mounting portion or a mounting hole formed in the case. Mounting structure of the linear light guide, by the instrument panel and the inner surface formed claw-like projection of the cover, by fixing the back of the case, the instrument panel, the Ganishu, and each member of said cover The mounting structure for a linear light guide according to claim 1 , wherein the linear light guide is fixed in the space formed on the light extraction portion side. The mounting structure for a linear light guide according to any one of claims 2 to 4 , wherein a plurality of side-emitting light emitters are housed in a case. The side emitting light emitter is either a side emitting plastic optical fiber , a side emitting glass optical fiber , or a transparent resin having a substantially circular cross section or a colored transparent resin round bar. The mounting structure for the linear light guide according to any one of items 1 to 5. Wherein the side-emitting light-emitting element, a blue phosphor, a green phosphor, claim 1, or a fluorescent fine particle of the yellow phosphor, and red phosphor characterized in that it dispersed in claim 6 The mounting structure of the linear light guide described in either. The mounting structure for a linear light guide according to claim 6, wherein the side light emitting type light emitting body and the flexible resin sheet are adhered to each other by an adhesive having light transmittance at the covering portion. The mounting structure for a linear light guide according to any one of claims 1 to 8, wherein the surface of the opening of the side light emitting body is roughened. The flexible resin sheet has a total reflectance of 90% or more and a diffuse reflectance of 90% or more as optical characteristics for visible light having a wavelength of 450 to 650 nm, according to claims 1 to 9 . The mounting structure of the linear light guide described in either. The flexible resin sheet, according claim 1, wherein the PET resin, PC resin, a micro-foamed resin sheet of a thermoplastic consisting of any of the flame retardant PC resins or acrylic resins, having fine bubbles The mounting structure for the linear light guide according to any one of Item 10 . The flexible resin sheet is made of a microfoamed resin having a foamed layer between the unfoamed layer and the unfoamed layer in the vicinity of the sheet surface of the flexible resin sheet, and the number density of bubbles in the portion excluding the unfoamed layer. The linear light guide according to any one of claims 1 to 11 , wherein the number is in the range of 10 ⁹ to ¹⁵ cells / cm ³ , and the average cell diameter is in the range of 0.5 to 20 μm. Mounting structure . The covering section, before Symbol flexible resin sheet or a portion wound around the side-emitting light-emitting element, cut-forming surface in which a plurality of cuts parallel linear is provided each other Tokoro Teifuka as the opposite The opposite surface of the flexible resin sheet having the opposite surface is one of the portions wound around the side light emitting body in parallel with the longitudinal direction of the side light emitting body in the direction of the notch. The mounting structure of the linear light guide according to any one of claims 1 to 12 , which is characteristic. The flexible resin sheet is obtained by stretching a resin film containing at least inorganic particles in polyester or a resin film containing a resin incompatible with polyester to provide shock absorption to the resin film having fine bubbles inside. The mounting structure for a linear light guide according to any one of claims 1 to 10, wherein the soft resin sheet to be provided is attached to the structure . The side light emitting type light emitter has a bent portion at least in a part in the longitudinal direction, and the optical characteristic of the bent portion is as an optical characteristic when the coating portion is formed of a microfoamed resin sheet. linear light guide mounting structure according to claims 10 to claim 13 in which the difference in diffuse reflectance of the curved portion to the diffuse reflectance of the straight portion is characterized in der Rukoto within 2% ±. A lighting device using the mounting structure of the linear light guide according to any one of claims 1 to 15 , wherein the mounting structure includes the linear light guide and a light source.
Light of a predetermined wavelength is incident from one or both end faces of the side light emitting body in the longitudinal direction by the light source in accordance with the optical axis of the side light emitting body, and the light taken out from the opening is garnished. A lighting device using a linear light guide mounting structure, which is characterized in that it can be taken out from a gap in a resin panel for light . The end face of the side light emitting body and the light source are brought into contact with each other for direct optical connection , or a lens is arranged between the end face of the side light emitting body and the light source and is optical connected via the lens. A lighting device using the mounting structure of the linear light guide according to claim 16 . 16. The 16th or claim, wherein the end portion of the light source and the side emitting light emitting body and the connecting portion extending from the light source to the end portion of the side emitting light emitting body are covered with a light reflecting member. A lighting device using the mounting structure of the linear light guide according to any one of item 17 . Claim 16 according to claim 16, wherein the lighting device using the mounting structure of the linear light guide is any one of a decorative lighting device , an automobile interior lighting device, a railroad vehicle lighting device, and an aircraft lighting device. An illuminating device using the mounting structure of the linear light guide according to any one of Item 18 .

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