JP2012033278A - Manufacturing method of light guide body with light reflection pattern - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a manufacturing method of a light guide plate with a light reflection pattern in which a light reflection pattern well suited to a light guide plate of any dimensions or shape can be formed easily and light from a light-emitting face can be emitted uniformly.SOLUTION: In the case of manufacturing a light guide body 10 with a light reflection pattern in which a light reflection pattern 31 is formed on a light reflection surface αof the light guide body 20, an adhesive is coated in pattern shape on a light reflection surface βin the light reflection sheet 30, and the light reflection surface βof the light reflection sheet 30 is adhered to the light reflection surface αof the light guide body 20, thereby, the light reflection pattern 31 is formed by the adhesive.

Description

  The present invention relates to a method of manufacturing a light guide with a light reflection pattern that can be suitably used for various light emitting devices.

  In recent years, the demand for planar light emitting devices that can irradiate light in a planar manner is increasing as decorative panels, advertising signs, backlights of liquid crystal display panels, and the like. 2. Description of the Related Art A planar light emitting device is widely known in which a light source is arranged along a specific end surface of a light guide plate formed of a transparent resin or the like. In this type of planar light emitting device, light emitted from a light source is incident on the inside of the light guide plate from the specific end surface (light incident surface), and one of the front and back plate surfaces of the light guide plate. After being reflected inward by the (light reflecting surface), it is emitted from the other plate surface (light emitting surface) to the outside of the light guide plate. In this type of planar light emitting device, various devices are provided to allow uniform light to be emitted from the light emitting surface of the light guide plate.

  For example, Patent Documents 1 and 2 describe a light guide plate in which a plurality of concave portions and convex portions are formed on the light reflection surface of the light guide plate. Since the light can be reflected while being diffused by the concave portion or the convex portion, uniform light can be emitted from the light emitting surface. However, the light guide plates of Patent Documents 1 and 2 are formed by injection molding or press molding of the concave portions and the convex portions, and a mold and a mold plate corresponding to the shape and dimensions of the light guide plate are prepared each time. Has the disadvantage of having to do. In addition, the light guide plates of Patent Documents 1 and 2 also have a drawback in that light is not emitted uniformly from the light exit surface when cut into dimensions and shapes other than those specified by the light guide plate manufacturer. This is because the appropriate dimensions and arrangement of the recesses and protrusions vary depending on the dimensions and shape of the light guide plate.

  Patent Document 3 describes a light guide plate in which a plurality of grooves are formed on the light reflection surface of the light guide plate by laser processing. Thus, by providing a groove on the light reflecting surface, light can be reflected while being diffused. Although the light guide plate of Patent Document 3 does not require a mold or a template for processing the groove, there is a drawback that a laser processing facility is required. In addition, the processing time is longer than that of injection molding or press molding. In addition, as with the light guide plates of Patent Documents 1 and 2, the laser processing method also has a drawback that the light guide plate cannot be used after being cut into an arbitrary size or shape.

  Further, Patent Documents 4 and 5 describe a light guide plate in which ink is printed in a pattern on the light reflection surface of the light guide plate. In this way, it is also possible to reflect light while diffusing it by printing ink on the light reflecting surface. Since the light guide plates of Patent Documents 4 and 5 do not require a mold or a template, they can be manufactured at low cost. However, a special printer that can directly print ink on the light guide plate is required. In addition, the light guide plates of Patent Documents 4 and 5 are the same as the light guide plates of Patent Documents 1 to 3 with respect to the fact that the light guide plate cannot be cut into an arbitrary size or shape.

  By the way, in order to cut out and use the light guide plate in an arbitrary size and shape, for example, a light reflection sheet on which a light reflection pattern for reflecting light while diffusing light is printed on the light reflection surface of the light guide plate. A method of superimposing can be considered. When this method is employed, the light reflection pattern can be easily changed by simply changing the printing pattern. In addition, the light guide plate and the light reflecting sheet can be handled separately. Therefore, an appropriate light reflection pattern can be easily formed on a light guide plate cut into an arbitrary size or shape by simply superimposing a light reflection sheet printed with a light reflection pattern suitable for the light guide plate. become.

  However, the method of superimposing the light reflecting sheet on the light guide plate has the following drawbacks. That is, in the light guide plate obtained by this method, the light guide plate and the light reflection pattern are not completely adhered, and an air layer is likely to exist between them. For this reason, it is difficult to reflect the light reaching the light reflecting surface as assumed by the light reflecting pattern, and it has not always been possible to emit uniform light from the light emitting surface.

JP 2002-303734 A JP 2008-175996 A JP 2008-31157 A JP 2003-344661 A JP 2008-095103 A

  The present invention has been made to solve the above-described problems, and can form a light reflection pattern on a light reflection surface of a light guide plate without using a mold or a template, and can have an arbitrary size and shape. The present invention also provides a method for manufacturing a light guide plate with a light reflection pattern, which can easily form a light reflection pattern suitable for the light guide plate. In addition, the light reflecting pattern is brought into close contact with the light reflecting surface of the light guide plate so that the light reaching the light reflecting surface is directly reflected by the light reflecting pattern and the light is uniformly emitted from the light emitting surface of the light guide plate. It is also an object of the present invention to provide a method for manufacturing a light guide plate with a light reflecting pattern.

Above-mentioned problems, emits the light incident surface alpha ₁ for incident light, a light reflecting surface alpha ₂ for reflecting the light incident from the light incident surface alpha _1, the light reflected by the light reflecting surface alpha ₂ Manufacture of a light guide with a light reflection pattern in which a light reflection pattern for reflecting light is formed on a light reflection surface α ₂ in a light guide (superior concept of a light guide plate) having a light emission surface α ₃ for a method (including an adhesive.) the adhesive on the light reflecting surface beta ₁ in the light reflecting sheet having a light reflecting surface beta ₁ for reflecting the light is applied to the pattern, the light reflection of the light reflecting sheet By providing a method of manufacturing a light guide with a light reflection pattern, wherein the light reflection pattern is formed with the adhesive by bonding the surface β ₁ to the light reflection surface α ₂ of the light guide. Solved.

  Thereby, it becomes possible to manufacture a light guide with a light reflection pattern without requiring a special device such as a mold, a template, or a laser processing device. In addition, it is possible to later form a light reflection pattern suitable for a light guide cut into an arbitrary size or shape. Therefore, not only can the manufacturing cost of the light guide with the light reflection pattern be reduced, but also the degree of freedom in selecting the form of the light guide with the light reflection pattern can be increased.

In addition, in the manufacturing method of the light reflection patterned light guide of the present invention, brought into close contact with the light reflecting surface alpha ₂ of the light guide to form a light reflection pattern, between the light reflecting surface alpha ₂ and the light reflecting pattern It is also possible to eliminate the presence of an air layer. Therefore, is incident on inside of the light guide the light that has reached the position where the light reflection pattern is formed on the light reflecting surface alpha _2, directly is reflected by the light reflection pattern without passing through the air layer, the light emitting so it may be emitted from the surface alpha _3. Therefore, it is possible to reflect light as expected by the light reflection pattern, it is easy to uniformly emit light from the light emitting surface alpha _3.

In the manufacturing method of the light reflection patterned light guide of the present invention, a method of applying an adhesive on the light reflecting surface beta ₁ in the light reflecting sheet is not particularly limited, usually applied by printing. Among these, it is preferable to apply an adhesive by screen printing. Thereby, it becomes easy to form a light reflection pattern in a fine dot shape or a thin line shape. Therefore, the light reflection pattern becomes possible to achieved the desired reflecting action, it becomes more easy to uniformly emit light from the light emitting surface alpha ₃ of the light guide.

  For screen printing, there is a method using a metal mask plate in addition to a method using a screen plate (silk screen), but it is more preferable to use a metal mask plate in the method for producing a light guide with a light reflection pattern of the present invention. It is. This is because (1) the metal mask plate has no mesh in the opening through which the adhesive passes, so that the adhesive passage resistance can be kept lower than the screen plate. (2) The metal mask plate is deformed. Therefore, it is possible to print the light reflection pattern with higher accuracy than the screen plate. (3) By selecting the thickness of the metal mask plate, the thickness of the adhesive (light reflection pattern) can be increased with high accuracy. This is because there are advantages such as easy control.

Form of the light reflection pattern is different depending on the shape of the lightguide is not particularly limited, the area of the adhesive coated adhesive coated portion of the light reflecting surface beta ₁ is identified in the light reflecting surface beta ₁ It is preferable to make it widen intermittently or continuously as it moves away from the edge of the. Thus, also it is possible to reflect more light in locations distant from the light source, consisting of the light emitting surface alpha ₃ of the light guide so can be more uniformly emitted light.

  Specific examples of intermittently increasing the area of the adhesive application portion include: (1) A light reflection pattern is constituted by a plurality of dots, and the area of each dot increases as the distance from the specific edge increases. (2) The light reflection pattern is composed of a plurality of dots, and the arrangement pitch of each dot is narrowed (the dots are denser) as the distance from the specific edge increases. Further, as a specific example for continuously increasing the area of the adhesive application portion, (3) the light reflection pattern is configured by a line non-parallel to the specific edge, and the line width is the specific width For example, it is made wider as it gets away from the edge.

Light reflecting surface alpha ₂ of the light guide body is usually the substantially entire surface is covered with a light reflecting sheet, is depending on the application of the light emitting device may be covered only partially by the light reflecting sheet. For example, there is a request from a user or a consumer of a display panel such as a road sign or an advertising billboard to light only a specific part (for example, a character, a figure or a symbol written on the display panel). In such a case, the light reflecting sheet is cut into a shape (characters, figures or symbols, or a combination thereof) to be shined, and then the light reflecting surface β ₁ of the light reflecting sheet. preferably adhered to the light reflecting surface alpha ₂ of the light guide.

In this way, by using the light reflecting sheet as a cutting sheet, it becomes possible to form a light reflecting pattern locally on the light reflecting surface α ₂ of the light guide plate, and the light is reflected locally on the light reflecting surface α _2. after reflection, it becomes possible to locally emit the reflected light from the light emitting surface alpha _3. In the manufacturing method of the light reflection patterned light guide of the present invention, even when the shine the light emitting surface alpha ₃ of the light guide plate locally, shining portion can be illuminated uniformly without unevenness. Therefore, it is possible to make it easy to visually recognize characters, figures and symbols written on the display panel not only at daytime but also at night. The light reflecting sheet may be cut before applying the adhesive, but after applying the adhesive in consideration of the ease of applying the adhesive (printing, etc.) and the convenience of forming the light reflecting pattern. It is preferable to cut.

The form of the light guide used in the method for producing a light guide with a light reflection pattern of the present invention is not particularly limited. For example, using a plate-shape as a light guide, at least a portion of the end surface of the light guide body is used as a light incident surface alpha _1, the one of the pair of plate surfaces of the light guide as a light reflecting surface alpha ₂ use, it is preferable to use the other as light emitting surface alpha _3. Thereby, the obtained light guide with a light reflection pattern can be suitably used for a planar light emitting device or the like.

Further, a cylindrical light guide is used, and at least a part of the end face of the light guide is used as the light incident surface α1, and _one of the inner peripheral surface and the outer peripheral surface of the light guide (especially the inner peripheral surface). ) using as a light reflecting surface alpha _2, it is also preferable to use the other (particularly the outer circumferential surface) as the light emitting surface alpha _3. Thereby, it is also possible to provide a light emitting device of a different form in which the outer peripheral surface and the inner peripheral surface emit light. In the above-described method using a mold, a template, a laser processing apparatus, or a method of printing ink directly on a light guide, it is very difficult to provide a light reflection pattern on the inner peripheral surface of the cylindrical light guide. However, in the method for manufacturing a light guide with a light reflection pattern according to the present invention, the light reflection sheet on which the light reflection pattern is formed is inserted into the light guide in a cylindrical shape, and light reflection is performed. It is only necessary to bond the adhesive applied to the sheet to the inner peripheral surface of the light guide. The manufacturing method of the light guide with a light reflection pattern of the present invention can easily form a light reflection pattern even for a light guide having such a complicated shape.

Moreover, the problem is the light incident surface alpha ₁ for incident light, a light reflecting surface alpha ₂ for reflecting the light incident from the light incident surface alpha _1, the light reflected by the light reflecting surface alpha ₂ A method of manufacturing a light guide with a light reflection layer in which a light reflection layer for reflecting light is formed on a light reflection surface α ₂ in a light guide having a light emission surface α ₃ for emission, light reflecting surface of the over the entire surface of the light reflecting surface beta ₁ an adhesive is applied, the light reflecting sheet of the light reflecting surface beta ₁ a light guide in the light reflecting sheet having a light reflecting surface beta ₁ for reflecting light by adhering to the alpha _2, it is also solved by providing a method for producing a light-reflecting layer with the light guide body and forming the light reflective layer by the adhesive. At this time, after the light reflecting sheet is cut into characters, figures or symbols, or a combination thereof, the light reflecting surface β ₁ of the light reflecting sheet is bonded to the light reflecting surface α ₂ of the light guide, The cut-out portion can be substantially regarded as the light reflection pattern.

  As described above, according to the present invention, a light reflection pattern can be formed on a light reflection surface of a light guide without using a mold or a template, and a light guide having an arbitrary size and shape can be formed. It is possible to provide a method for manufacturing a light guide with a light reflection pattern, which can easily form a light reflection pattern suitable for the light reflection pattern. In addition, the light reflecting pattern is closely attached to the light reflecting surface of the light guide so that the light reaching the light reflecting surface is directly reflected by the light reflecting pattern and the light is uniformly emitted from the light emitting surface of the light guide. It is also possible to provide a method of manufacturing a light guide with a light reflection pattern that can be made to be.

It is the perspective view which showed the light guide with a light reflection pattern of a 1st embodiment. It is the perspective view which showed the state which decomposed | disassembled the light guide with a light reflection pattern of a 1st embodiment. It is the perspective view which showed the state which decomposed | disassembled the light guide with a light reflection pattern of 2nd embodiment. It is the perspective view which showed the state which decomposed | disassembled the light guide with a light reflection pattern of 3rd embodiment. It is the perspective view which showed the light reflection sheet used for the light guide with a light reflection pattern of a 3rd embodiment. It is the top view which showed the light-projection surface at the time of light emission of the light guide with a light reflection pattern of 3rd embodiment.

The manufacturing method of the light guide with a light reflection pattern of the present invention will be described more specifically with reference to the drawings. FIG. 1 is a perspective view showing a light guide 10 with a light reflection pattern of the first embodiment. FIG. 2 is a perspective view showing a state in which the light guide 10 with the light reflection pattern of the first embodiment is disassembled. FIG. 3 is a perspective view showing a state where the light guide 60 with the light reflection pattern of the second embodiment is disassembled. FIG. 4 is a perspective view showing a state in which the light guide 90 with the light reflection pattern of the third embodiment is disassembled. FIG. 5 is a perspective view showing the light reflecting sheet 110 used for the light guide 90 with the light reflecting pattern of the third embodiment. Figure 6 is a plan view showing a light emitting surface alpha ₃ when emitting light reflection patterned light guide 90 of the third embodiment. In the following, the light guide 10 with the light reflection pattern of the first embodiment and the manufacturing method thereof, the light guide 60 with the light reflection pattern of the second embodiment and the manufacturing method thereof, and the light reflection pattern of the third embodiment. The attached light guide 90 and the manufacturing method thereof will be described in order, but the technical scope of the present invention is not limited to these embodiments, and appropriate modifications can be made without departing from the spirit of the invention.

  First, the manufacturing method of the light guide 10 with the light reflection pattern of the first embodiment will be described. As shown in FIG. 1, the light guide 10 with a light reflection pattern manufactured by the manufacturing method of the first embodiment is for reflecting light on one side of a plate-shaped light guide plate 20 (subordinate concept of the light guide). A light reflection pattern 31 (a large number of circular portions indicated by broken lines in FIG. 1) is formed. In the light guide 10 with the light reflection pattern, a light source 40 is separately disposed on one end surface of the light guide plate 10 so as to emit light on the one end surface side. The type of the light source 40 is not particularly limited, but usually a substrate on which light emitting diodes are arranged is employed.

Light emitted from the light source 40 enters the light guide plate 20 from the light incident surface α ₁ of the light guide plate 20 (one end surface ABCD of the light guide plate 20; see FIG. 2). Are reflected by the light reflecting pattern 31 formed on the light reflecting surface α ₂ (one plate surface DCGH in the light guide plate 20; see FIG. 2). The light reflected by the light reflecting surface alpha _2, the light emitting surface alpha ₃ opposite the light reflecting surface alpha _{2 (in} the other end surface of ABFE the light guide plate 20 that. See Figure 2.) From the light guide plate 20 to the outside Is emitted. Light emitting surface alpha ₃ of the light guide plate 20, as shown in FIG. 2, preferably covered with a light diffusion sheet 50 for diffusing the light. Thus, the light emitting surface alpha ₃ of the light guide plate 20 it is possible to prevent shine locally.

  The shape of the light guide plate 20 is not particularly limited as long as the light guide plate 20 has a certain thickness, and may be a circular shape in a plan view or a triangular shape in a plan view. A rectangular shape in plan view is used. In addition, the material of the light guide plate 20 is not particularly limited as long as it has light guide properties, and glass or the like may be adopted, but considering the light weight of the light guide plate 20 and the ease of processing, It is preferable to form with the hard resin which has translucency. Suitable hard resins for forming the light guide plate 20 include polycarbonate resins, polyester resins (polyethylene terephthalate, etc.), methacrylic resins (acrylic resins), styrene resins, polyvinyl chloride resins, polyolefin resins. Examples thereof include polyamide-based resins. All of these resins are easily melt-molded. The light guide plate 20 may be formed by mixing two or more of these resins. Considering transparency, heat resistance, impact resistance, etc., among these resins, polycarbonate resins are preferable. The light guide plate 20 is usually supplied from a light guide plate manufacturer.

Next, a method for forming a light reflection pattern 31 on the light reflecting surface alpha ₂ of the light guide plate 20. In the manufacturing method of the first embodiment, as shown in FIG. 2, the light reflection sheet 30 on which the light reflection pattern 31 is formed is adhered to the light reflection surface α ₂ of the light guide plate 20, whereby the light reflection of the light guide plate 20. forming a light reflection pattern 31 on the surface alpha _2. The light reflecting sheet 30 has an adhesive applied on one surface thereof, and a light reflecting pattern 31 is formed by the adhesive. Hereinafter, the surface of the light reflecting sheet 30 on which the light reflecting pattern 31 is formed is referred to as “light reflecting surface β ₁ (see FIG. 2)”.

A method for applying the adhesive for forming the light reflection pattern 31 to the light reflection sheet 30 is not particularly limited, but printing is usually used. In the production method of the first embodiment, by screen printing using a metal mask plate, it is printing light reflection pattern 31 on the light reflecting surface beta ₁ of the light reflecting sheet 30. For this reason, even if it is a case where the fine point-like light reflection pattern 31 is formed like the manufacturing method of the first embodiment, it can be easily applied with high accuracy.

Although the form of the light reflection pattern 31 is not particularly limited, in the manufacturing method of the first embodiment, as shown in FIG. 2, the area of each point (adhesive application part) constituting the light reflection pattern 31 is light reflection. It is made to become wide intermittently as it leaves | separates from the specific edge part in surface (beta) ₁ . Here, the “specific edge” refers to an edge that is bonded along an edge that forms one end surface of the light guide plate 20 where the light source 40 is disposed, among the edges of the light reflecting sheet 30. That is. In this way, the position of the same degree of light it is possible to reflect closer to the light source also at a distance from the light source, so as to be able to light emitted from the light emitting surface alpha ₃ more uniform It has become.

  The material of the light reflection sheet 30 is appropriately determined in consideration of compatibility (adhesiveness) with the light reflection pattern 31. The light reflecting sheet 30 is typically exemplified by paper (including synthetic paper), a resin film, a metal film, and the like. As will be described later, when the light reflection pattern 31 is formed of an adhesive, any of these films can be used. If importance is attached to durability or difficulty in forming wrinkles, a resin film or a metal film may be used. On the other hand, if cost and ease of handling are considered rather than durability, paper may be used. Among these, synthetic paper such as YUPO (registered trademark) is suitable as the light reflecting sheet 30 because it has excellent durability. The light reflecting sheet 30 is more preferably flame retardant or non-flammable.

The color of the light reflecting surface beta ₁ in the light reflecting sheet 30 is also not particularly limited, at least a light reflecting surface beta ₁ is preferably kept as whitish color. This makes it possible to reflect at a high reflectivity while diffusing toward the light light reflection pattern 31 hits the portion not provided in the light guide plate 20 in the light reflecting surface beta ₁ of the light reflecting sheet 30, uniformity of the light emitted from the light exit surface alpha ₃ of the light guide plate 20 can be further increased.

The size and shape of the light reflecting sheet 30 differ depending on the size and shape of the light reflecting surface α ₂ of the light guide plate 20, and are not particularly limited, but are usually large enough to cover the entire surface of the light reflecting surface α ₂ with the light reflecting sheet 30. It is assumed. In the manufacturing method of the first embodiment, the light reflecting sheet 30 is rectangular in plan view, and the size and shape thereof are matched with the size and shape of the light reflecting surface α ₂ of the light guide plate 20. . The cutting of the light reflecting sheet 30 may be performed before the light reflecting pattern 31 is printed, or may be performed after the light reflecting pattern 31 is printed. Further, after the light reflecting sheet 30 is attached to the light guide plate 20, the edge of the light reflecting sheet 30 protruding from the light guide plate 20 may be cut off.

The adhesive forming the light reflection pattern 31 is not particularly limited as long as it has high transparency, can be bonded to both the light guide plate 20 and the light reflection sheet 30, and can reflect light. Among various adhesives such as a pressure-sensitive adhesive, a solid adhesive (hot melt adhesive), a reactive adhesive, a solution adhesive, and a water dispersion adhesive, those satisfying these conditions are adopted. Among these, it is preferable to employ a pressure-sensitive adhesive (adhesive) as the adhesive.
When the light reflection pattern 31 is formed with a pressure-sensitive adhesive,
(1) The light reflecting sheet 30 can be bonded to the light guide plate 20 simply by pressing the light reflecting surface β ₁ (adhesion surface) of the light reflecting sheet 30 against the light guide plate 20.
(2) When the light reflecting sheet 30 is bonded to the light guide plate 20, it is not necessary to heat the adhesive in particular, so that no special equipment is required.
(3) The open time (the time during which the adhesive can exert its adhesive force) is long, and the light reflecting sheet 30 is easy to handle.
(4) Since re-adhesion is possible, even if the adhesion position of the light reflection sheet 30 with respect to the light guide 20 is shifted, it can be re-applied.
(5) Until the light reflecting sheet 30 is bonded to the light guide plate 20, by covering the light reflecting surface β ₁ (adhesive surface) of the light reflecting sheet 30 with release paper or the like, it is possible to prevent a decrease in the adhesive force. .
There are advantages such as.
When the adhesive is printed on the light reflecting sheet 30, a printable one is selected. Specifically, the thixotropy (thixotropic property) is high, and it is required that the yarn is not pulled at the time of printing, or that the solvent is volatilized during printing and has a slow drying property that does not change the viscosity.

  The specific material of the adhesive that forms the light reflection pattern 31 is not particularly limited, but a synthetic resin adhesive is usually employed. Among these, an acrylic resin-based adhesive is preferable in consideration of adhesiveness with the material of the light guide plate 20. In particular, it is preferable to use an adhesive using an acrylic ester polymer as a main ingredient. This is because this type of adhesive is easy to handle and also adheres to a polycarbonate resin, an acrylic resin, or the like that can be employed as a material of the light guide plate 20 without any problem. In the manufacturing method of the first embodiment, an adhesive (vinyl acetate / acrylic acid ester copolymer resin adhesive “Baron T-100”) manufactured by Daiichi Paint Co., Ltd. is improved as the adhesive. Is adopted.

In the manufacturing method of the first embodiment, the light reflection pattern 31 is formed with an adhesive for a large reason other than the above. That is, the light reflecting surface alpha ₂ of the light guide plate 20, not the light reflection pattern 31 and is in close contact of the light reflecting sheet 30, the air layer is present, the uniform light from the light exit surface alpha ₃ emitted during There is a risk of disappearing. On the other hand, in the light guide 10 with the light reflection pattern of the first embodiment, since the light reflection pattern 31 is formed of an adhesive, the light reflection pattern 31 is brought into close contact with the light reflection surface α ₂ of the light guide plate 20. be able to. Accordingly, the light reflection pattern 31 of light reaching the light reflecting surface alpha ₂ it is possible to reflect while diffusing in a desired state in the light guide plate 20, a more uniform illumination from the light emitting surface alpha ₃ in the light guide 20 Light can be obtained.

By the way, it is also preferable that the adhesive forming the light reflection pattern 31 absorbs infrared rays and / or ultraviolet rays. In order to absorb infrared rays, infrared absorption such as cyanine dyes, polymethine dyes, squarylium dyes, porphyrin dyes, metal dithiol complex dyes, phthalocyanine dyes, diimonium dyes or inorganic oxide particles in adhesives An agent may be added. Thus, by absorbing infrared by the light reflection pattern 31, by reducing the amount of infrared rays emitted from the light emitting surface alpha ₃ of the light guide 31, it can be the temperature at the irradiation target is not increased become. This configuration is not particularly required when the light source 40 is cut from infrared rays, but the light source 40 is not cut from infrared rays and the irradiation target is refrigerated food, frozen food or cosmetics. For example, it is preferable to adopt it when it is difficult to get warm.

On the other hand, in order to absorb ultraviolet rays with the light reflection pattern 31, an ultraviolet absorber may be added to the resin composition constituting the adhesive. There are various types of ultraviolet absorbers. For example, salicylic acid ultraviolet absorbers, benzophenone ultraviolet absorbers, benzotriazole ultraviolet absorbers, cyanoacrylate ultraviolet absorbers, and benzoate ultraviolet absorbers are suitable. . Thus, by absorbing UV at the light reflection pattern 31, by reducing the amount of ultraviolet rays emitted from the light emitting surface alpha ₃ of the light guide 31, to be capable of preventing deterioration due to ultraviolet irradiation target Become. This configuration is not particularly required when the light source 40 is cut from ultraviolet rays, but the light source 40 is not cut from ultraviolet rays, and the irradiation target is made of ultraviolet rays such as paintings and clothes. It is suitable for use when it causes deterioration such as fading.

In the manufacturing method of the first embodiment, as described above, by adhering the light reflecting sheet 30 in the light guide plate 20, forming a light reflection pattern 31 on the light reflecting surface alpha ₂ of the light guide plate 20. For this reason, the assembler which adhere | attaches the light reflection sheet 30 on the light-guide plate 20 can cut out the board | plate material supplied from the material maker to arbitrary dimension shapes, and can use it as the light-guide plate 20. FIG. This is because the assembler side can arbitrarily determine the form of the light reflection pattern 31 adapted to the size and shape of the light guide plate 20. Further, since the light reflection pattern 31 is formed by a simple method of printing, it is not necessary to use a special and expensive apparatus such as a mold, a template, or a laser processing apparatus. Therefore, it is possible to supply a product according to the individuality of the assembler to the market at a low cost. The light guide 10 with a reflection pattern manufactured as described above can be suitably used as a decorative panel, an advertisement signboard, a backlight of a liquid crystal display panel, or the like.

Then, the manufacturing method of the light-guide plate 60 with a light reflection pattern of a 2nd embodiment is demonstrated. The light guide 60 with a light reflection pattern manufactured by the manufacturing method of the second embodiment uses a cylindrical light guide cylinder 70 (subordinate concept of the light guide) as shown in FIG. Of the pair of opening end face of the light guide tube 70, one is used as a light incident surface alpha ₁ for incident light. That is, a plurality of light emitters and light source not illustrated arranged annularly emission direction of the light is disposed to face the light incident surface alpha ₁ of the light guide 70.

Further, the inner circumferential surface of the light guide tube 70 is used as the light reflecting surface alpha ₂ for reflecting the light incident from the light incident surface alpha ₁ to the inside of the light guide 70. The light reflecting surface alpha ₂ of the light guide tube 70, adhered in a state of bending the light reflecting sheet 80 where the light reflection pattern 81 is formed in a cylindrical shape. About the light reflection sheet 80 and the light reflection pattern 81, since it is the same as that of the light reflection sheet 30 and its light reflection pattern 31 which were used with the light guide 10 with a light reflection pattern of 1st embodiment, description is omitted. Moreover, since the material of the light guide tube 70 and the like are the same as those of the light guide 10 with the light reflection pattern of the first embodiment, description thereof is omitted.

  In a conventional light guide with a light reflection pattern, when the light guide is cylindrical, it is impossible to form a light reflection pattern on the inner peripheral surface, and a light reflection pattern is formed on a curved surface. Although it is difficult to do, in the manufacturing method of the second embodiment, the light reflection pattern 81 can be easily formed on the inner peripheral surface of the light guide tube 70 simply by adhering the light reflection sheet 80.

The outer peripheral surface of the light guide tube 80 is used the light reflected while being diffused by the inner circumferential surface of the light guide tube 70 as the light emitting surface alpha ₃ for emitting to the outside. Similarly to the optical reflection pattern with the light guide 10 of the first embodiment, the light emitting surface alpha ₃ of the light guide tube 70 in the light reflection pattern with the light guide 60 of the second embodiment, the light for diffusing light A diffusion sheet (not shown) may be provided. The cylindrical light guide 60 with a light reflection pattern obtained by the manufacturing method of the second embodiment can be suitably used as illumination, various display boards, and the like that are excellent in decorativeness whose outer peripheral surface shines.

Finally, the light guide 90 with the light reflection pattern of the third embodiment will be described. As shown in FIG. 4, the light guide 90 with the light reflection pattern of the third embodiment is a light reflection pattern 111 (for reflecting light on one side of a plate-like light guide plate 100 (subordinate concept of the light guide)). A portion indicated by hatching in FIG. 4 is formed. In the light guide 90 with the light reflection pattern, the light source 120 is arranged on one end face (light incident surface α ₁ ) of the light guide plate 100 so as to emit light toward the light incident surface α ₁ . A light diffusion sheet 130 is disposed on one plate surface (light emitting surface α ₃ ) of the light guide plate 100.

In the light guide 90 with the light reflection pattern of the third embodiment, the light reflection pattern 111 is formed by converting the rectangular light reflection sheet 110 into letters (“Okayama”, “Okayama”, “Exit”, and “ EXIT ") and a figure (arrow). In this case, an adhesive may be applied to the light reflecting sheet 110 in a pattern like the light reflecting sheet 30 in FIG. 2, or may be uniformly applied over the entire surface. Light reflecting surface beta ₁ of each of the light reflection pattern 111 is disconnected, as shown in FIG. 4, it is bonded to the light reflection surface alpha ₂ of the light guide plate 100. Thus, by using a light reflecting sheet 110 as cutting sheet, locally it is possible to form the light reflection pattern 111 on the light reflecting surface alpha ₂ of the light guide plate 100, as shown in FIG. 6, the light It becomes possible to make the light guide 90 with a reflection pattern suitable for use as a display panel such as a road sign. In FIG. 6, a portion indicated by hatching is a non-light emitting portion that does not emit light, and a portion indicated by white is a light emitting portion that emits light. As a result, it is possible to obtain a display panel that emits light of characters and figures and is easily visible at night. The relationship between the light emitting part and the non-light emitting part may be reversed. Other configurations not described here are the same as those of the light guide 10 with the light reflection pattern of the first embodiment, and thus the description thereof is omitted.

As described above, in the method for manufacturing a light guide with a light reflection pattern according to the present invention, a material (plate material, cylinder, etc.) that serves as a light guide is supplied from the material manufacturer of the light guide (light guide plate, light guide cylinder, etc.) to the assembler. At this stage, the light reflection pattern is not formed on the material. For this reason, the assembler cuts out the supplied material into an arbitrary size and shape to form a light guide, and attaches a light reflection sheet on which a light reflection pattern is formed to the light guide to reflect light. A light guide with a pattern can be obtained. Further, the light reflection pattern, since the form in the adhesive, is excellent in adhesion to the light reflecting surface alpha ₂ of the light guide body. Therefore, desired uniform irradiation light can be obtained.

10 Light Guide with Light Reflection Pattern of First Embodiment 20 Light Guide Plate (Light Guide)
DESCRIPTION OF SYMBOLS 30 Light reflection sheet 31 Light reflection pattern 40 Light source 50 Light diffusion sheet 60 Light guide with light reflection pattern of 2nd embodiment 70 Light guide cylinder (light guide)
DESCRIPTION OF SYMBOLS 80 Light reflection sheet 81 Light reflection pattern 90 Light guide with a light reflection pattern of 3rd embodiment 100 Light guide plate (light guide)
110 light reflecting sheet 111 light reflecting pattern 120 light source 130 light diffusion sheet α ₁ light incident surface α ₂ light reflecting surface α ₃ light emitting surface β ₁ light reflecting surface

Claims (8)

The light incident surface alpha ₁ for incident light, a light reflecting surface alpha ₂ for reflecting the light incident from the light incident surface alpha _1, light emission for emitting the light reflected by the light reflecting surface alpha ₂ A method of manufacturing a light guide with a light reflection pattern in which a light reflection pattern for reflecting light is formed on a light reflection surface α ₂ in a light guide having a surface α ₃ ,
An adhesive is applied to the light reflecting surface beta ₁ in the light reflecting sheet having a light reflecting surface beta ₁ for reflecting light in a pattern,
By adhering the light reflecting surface β ₁ of the light reflecting sheet to the light reflecting surface α ₂ of the light guide,
The method for producing a light guide with a light reflection pattern, wherein the light reflection pattern is formed with the adhesive. The manufacturing method of the light guide with a light reflection pattern of Claim ₁ which apply | coats the said adhesive agent to the light reflection surface (beta) ₁ in a light reflection sheet by screen printing. Area of the adhesive bonding agent application unit that is applied is in the light reflecting surface beta ₁ is claim 1 or 2 was intermittently or continuously widens as the distance from the specific edge in the light reflecting surface beta ₁ The manufacturing method of the light guide with a light reflection pattern of description. Claim light reflecting sheet, characters, adhering the cut to shapes or symbols, or shapes a combination thereof, a light reflecting surface beta ₁ of the light reflecting sheet on the light reflecting surface alpha ₂ of the light guide 1-3 The manufacturing method of the light guide with a light reflection pattern of any one. Use a plate-shaped light guide,
At least a portion of the end face used as light incident surface alpha ₁ of the light guide body, using one of a pair of plate surfaces of the light guide as a light reflecting surface alpha _2, utilizing the other as the light emitting surface alpha ₃ The manufacturing method of the light guide with a light reflection pattern in any one of Claims 1-4. Use a cylindrical light guide,
At least a portion of the end face used as light incident surface alpha ₁ of the light guide body, using one of the inner and outer peripheral surfaces of the light guide as a light reflecting surface alpha _2, and the other as the light emitting surface alpha ₃ The manufacturing method of the light guide with a light reflection pattern in any one of Claims 1-4 utilized. The light incident surface alpha ₁ for incident light, a light reflecting surface alpha ₂ for reflecting the light incident from the light incident surface alpha _1, light emission for emitting the light reflected by the light reflecting surface alpha ₂ A method of manufacturing a light guide with a light reflection layer in which a light reflection layer for reflecting light is formed on a light reflection surface α ₂ in a light guide having a surface α ₃ ,
Applying an adhesive over the entire surface of the light reflecting surface β ₁ in the light reflecting sheet having the light reflecting surface β ₁ for reflecting light;
By adhering the light reflecting surface β ₁ of the light reflecting sheet to the light reflecting surface α ₂ of the light guide,
The method for producing a light guide with a light reflection layer, wherein the light reflection layer is formed with the adhesive. A light reflecting sheet, characters, from the cut to the shape or symbol, or shape combining these, according to claim 7, wherein bonding the light reflecting surface beta ₁ of the light reflecting sheet on the light reflecting surface alpha ₂ of the light guide Manufacturing method of light guide with light reflection pattern.

Images