JPH06118247A - Manufacture of edge light guide boy - Google Patents

Abstract

PURPOSE:To simply and quickly manufacture an edge light guide body not required to form the pattern of very fine, extremely precise irregular reflection portions in the process to form the irregular reflection portions into a roughened surface shape, having good irregular reflection efficiency, and capable of generating bright edge light. CONSTITUTION:Irregular reflection portions 9 are formed at least on one face 8 side of the surface and the back face of a plate body A made of a transparent or semi-transparent optical medium, the face 8 of the plate body A formed with the irregular reflection portions 9 is formed into a uniform or nearly uniform roughened surface shape over the whole, and attached objects 10 limiting the irregular reflection quantity are stuck at part of the roughened face 8.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention has a plate-like body made of a transparent or semi-transparent optical medium having a diffused reflection portion formed on at least one surface side of the plate-like body. The present invention relates to a method for manufacturing a light guide body for an edge light, in which the light guide surface to be introduced into is formed on the end surface of the plate body.

FIG. 1 shows an example of an edge light.
An ultra-thin light box is shown. In the ultra-thin light box, the upper surface side of the casing P is configured as an illuminating surface, and by arranging a positive image photograph (positive film) such as a slide photograph on the illuminating surface, the positive image photograph is transmitted light. It is configured so that it can be observed. Inside the casing P, there are provided a plate-like body A as a light guide for edge light, and two light sources L in a state of facing the light guide surface 2 formed on the end face of the plate-like body A. There is. The irregular reflection portion 9 is formed on the lower surface 8 side of the plate-shaped body A.

FIG. 2 shows the principle of the edge light. The edge lights are light b1, b2, b from the light source L.
The light source L and the plate-shaped body A are arranged in a state where 3, b4 are introduced into the plate-shaped body A from the light guide surface 2 of the plate-shaped body A, and are formed on the lower surface 8 side of the plate-shaped body A. The diffused light b1 or b2 is diffused at the diffused reflection portion 9a or 9b, so that the diffusely reflected light b1 or b2 is emitted to the outside of the plate-shaped body A. Irregular reflection portion 9a,
The light that does not strike 9b, for example, the lights b3 and b4, are included in the incident angle when introduced from the light guide surface 2, the plate thickness of the plate A, and the refractive index of the optical medium forming the plate A. Therefore, the incident angle θ when reaching the upper surface or the lower surface of the plate A is
Is totally reflected within the critical angle θ _c and is not emitted to the outside of the plate-shaped body A, and reaches the irregular reflection portion until the plate-shaped body A is reached.
Configured to continue propagating inside.

By the way, the amount of light emitted from the illumination surface of the ultra-thin light box per unit area (that is, illuminance) is determined by the irregular reflection portion 9 per unit area on the surface 8 on which the irregular reflection portion 9 is formed. The size of the area can be adjusted. Therefore, the diffused reflection portion 9 of the light guide for an edge light of this kind is adjusted so that the illuminance on the illuminated surface of the edge light is uniform, or the intensity of the illuminance is set at a specific position on the illuminated surface. In addition, for example, a set of dots, a set of lines, a triangle, or a comb-shaped graphic pattern is often formed in a dispersed state. In addition, these graphic patterns must be formed very finely and with high precision on the surface of the plate-shaped body A in order to eliminate the unevenness of the illuminance on the illuminated surface.

[0005]

2. Description of the Related Art Conventionally, in a method of manufacturing a light guide for an edge light of this type, a diffuse reflection portion formed on a plate-like body is a light-density white ink to which a diffuse reflection material such as glass beads is added. It has been formed by a method of applying a milky white paint or the like on the surface of the plate-like body by a printing technique such as printing by silk screening.

[0006]

According to the above-mentioned prior art, it is possible to easily and quickly form a very fine and ultra-precision graphic pattern of a diffused reflection portion on a plate-like body. However, in the light guide for an edge light manufactured by the above-mentioned conventional technique, some reflection occurs even at the interface between the plate and the ink, so that one of the light that propagates in the plate and is incident on the irregular reflection portion. The part is returned to the inner side of the plate again due to the reflection at the interface and can not reach the ink or paint, and the light diffusely reflected by the diffuse reflection part is reduced, or it reaches the ink or paint and is diffusely reflected. Light is also repeatedly diffused within the thickness of the ink or paint to be attenuated, or when it is ejected to the outside of the ink or paint again, a pigment or particles for diffuse reflection that are present on the optical path form a shadow. As a result, the diffuse reflection light is blocked, so that the diffuse reflection efficiency of the light guide for the edge light as a whole deteriorates, the illuminance of the edge light decreases, and a bright edge light is constructed. There is an inconvenience that can not.

On the other hand, in order to eliminate the above-mentioned inconvenience,
It is desirable to form the surface of the plate directly into a rough surface without using ink or paint to form the irregular reflection portion, but it is a very fine and ultra precise figure pattern of the irregular reflection portion. It was almost impossible to form a rough surface by, for example, cutting or sandblasting.

By the way, it is possible to form the irregular reflection portion in a rough surface shape by injection molding or mold forming such as solven casting, but in this method, the medium substance constituting the plate-like body is optically formed. In order to form isotropically and homogeneously, the pressure injection and curing process of the medium material must be performed gradually and statically over a very long period of time, which significantly deteriorates the production efficiency and production cost. Therefore, it could not be applied to the modern mass production type industrial production process.

An object of the present invention is to eliminate the above-mentioned conventional drawbacks.

[0010]

A first characteristic configuration of a method for manufacturing a light guide for an edge light according to the present invention is characterized in that, in forming the irregular reflection portion, a surface of the plate member on which the irregular reflection portion is formed is formed. , To form a uniform or almost uniform rough surface over the entire surface or almost the entire surface, and then attach a deposit that limits the amount of diffused reflection to a part of the surface formed into the rough surface. is there.

The second and third characteristic configurations of the method for manufacturing a light guide for an edge light according to the present invention specify a preferable specific configuration for implementing the first characteristic configuration. The constitution is that the rough surface is formed by sandblasting.

A third characteristic configuration is that the adhering substance is transparent ink and the adhering substance is adhered by printing.

[0013]

According to the first characteristic configuration of the present invention, in forming the diffused reflection portion, the surface of the plate-like body on which the diffused reflection portion is formed has a uniform or substantially uniform rough surface. Therefore, it is not necessary to form a very fine and ultra-precision pattern of irregular reflection portions in the course of forming a rough surface. In addition, next, since the adhered matter that restricts the diffused reflection amount is adhered to a part of the surface formed in the rough surface shape, depending on the part where the adhered matter is not adhered,
An irregular reflection portion can be formed.

According to the second characteristic configuration, since the rough surface is formed by sandblasting, the rough surface is formed uniformly or almost uniformly over the entire surface or the substantially entire surface of the plate member forming the irregular reflection portion. The surface can be formed easily and quickly.

According to the third characteristic configuration, since the adhered matter is the transparent ink, when the transparent ink is adhered to the rough surface, the amount of diffused reflection of the rough surface is obtained by the same effect as when the ground glass is spit. Since the transparent ink can be deposited by printing, it is possible to more easily and quickly form a very fine and ultra-precision graphic pattern of the irregular reflection portion.

[0016]

According to the first characteristic configuration, it is necessary to form a very fine and ultra-precise figure pattern of the irregular reflection portion in the course of forming the irregular reflection portion while forming the irregular reflection portion in the rough surface shape. Therefore, it is possible to provide a method for manufacturing a light guide for an edge light, which can easily and quickly produce a light guide for an edge light that has a high diffuse reflection efficiency and can form a bright edge light. it can.

Further, the low diffuse reflection portion may be formed by making the portion to which the adhered matter adheres to a state in which the diffused reflection due to the rough surface as the base remains to some extent even after the adhered matter is adhered. For example, it is possible to adjust the illuminance of the edge light depending on the distribution ratio of the diffuse reflection part and the low diffuse reflection part, but also diffuse reflection in the low diffuse reflection part. It is possible to provide a method for manufacturing a light guide for an edge light that can produce a light body.

According to the second characteristic configuration, the rough surface uniformly or substantially uniformly formed over the entire surface of the plate-like body forming the irregular reflection portion can be formed easily and quickly. It is possible to provide a method for manufacturing a light guide for an edge light, which can easily and quickly produce a light guide for an edge light with less unevenness of reflected light emitted from a sheet.

According to the third characteristic constitution, a very fine and ultra-precision irregular reflection portion graphic pattern can be formed easily and quickly. Therefore, the light guide for the edge light whose illuminance is adjusted more precisely. It is possible to provide a method for manufacturing a light guide body for an edge light, which can easily and quickly produce a body.

Furthermore, if transparent ink is applied by a printing technique such as photosensitive printing of photoresist or printing by silk screening, the surface of the applied transparent ink is formed by a mirror surface mold or a mirror surface roller. It does not look like a smooth surface, and in the case of printing by silk screening, the fine mesh after the silk screen will be left on the surface of the transparent ink,
It is formed into a rough surface in which diffuse reflection occurs to some extent. Therefore,
If the transparent ink is applied by printing, the low diffuse reflection portion can be easily configured, and thus a bright edge light guide body with an increased diffuse reflection amount can be easily produced. A method for manufacturing a light guide for an edge light can be provided.

[0021]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows an ultra-thin light box provided with a plate-like body A as an edge light guide manufactured by the method for manufacturing an edge light guide according to the present invention. In the ultra-thin light box, the upper surface side of the casing P is formed as an illuminating surface, and by arranging a positive image photograph (positive film) such as a slide photograph on the illuminating surface, the positive image photograph is transmitted light. It is configured so that it can be observed. A milky white and semi-transparent acrylic plate 1 is provided on the illuminated surface of the casing P, and the color temperature of the illuminated light emitted from the illuminated surface is, for example, 50.
It is configured to be adjusted to 00 degrees.

Inside the casing P, an acrylic plate A as a plate made of a transparent or semitransparent optical medium is used.
And two fluorescent tubes L as light sources provided in a state where light is introduced into the acrylic plate A from the light guide surface 2 formed on the end surface of the acrylic plate A, and for causing the fluorescent tube L to emit light. And the circuit device 3 of FIG.

The fluorescent tube L is a cold cathode fluorescent tube or a hot cathode fluorescent tube. A battery 5 is connected to the outside of the casing P via a pin jack 4 so that electric power is supplied to the fluorescent tube L.
Incidentally, if an A / C adapter is connected via the pin / jack 4, power can be supplied from a household AC power supply.

A reflecting mirror 6 is attached to the fluorescent tube L,
All the light emitted from the fluorescent tube L is the light guide surface 2 of the acrylic plate A.
Is configured to be introduced to. A reflection plate 7 having a mirror surface on the upper surface side is also provided below the acrylic plate A, and is configured to reflect light emitted from the lower surface side of the acrylic plate A toward the upper surface side.

A diffused reflection portion 9 is formed on the lower surface 8 side as one surface side of the acrylic plate A. In FIG. 3, the acrylic plate A is shown with the lower surface 8 side visible. The irregular reflection portion 9 is formed in a dispersed state in which a plurality of boat-shaped patterns are arranged side by side. The boat-shaped pattern has an acrylic plate A with its longitudinal direction oriented in the direction in which the fluorescent tubes L are arranged and along the longitudinal direction of the fluorescent tubes L.
A large number of them are arranged side by side over substantially the entire lower surface 8. That is, the irregular reflection portion 9 is farther from the light guide surface 2 than the portion 8a of the acrylic plate A that is closer to the light guide surface 2.
It is formed in a state in which b is larger. by the way,
As shown in FIG. 2, the light b radiated per unit area of the irregular reflection portion 9b formed in the portion far from the light guide surface 2.
The amount of 2 is that the distance from the light source L is long and the irradiation area per the same light source area is wide, and that the length of the optical path propagating inside the plate-like body A is long and the attenuation amount is increased. Therefore, the amount of the light b1 emitted per unit area of the irregular reflection portion 9a formed in the portion close to the light guide surface 2 is smaller than that of the irregular reflection portion 9a. The quantity is also decreasing. Therefore, the graphic pattern of the irregular reflection portion 9 shown in FIG. 3 is configured to adjust the irregular reflection amount of the irregular reflection portion 9 on the acrylic plate A so that the illuminance on the illuminated surface of the ultra-thin light box becomes uniform. There is.

In FIG. 3, the boat-shaped pattern forming the irregular reflection portion 9 is considerably larger than the overall size of the ultra-thin light box for the sake of clarity. However, in reality, they are extremely thin and numerous, and are formed with high precision.

The irregular reflection portion 9 is formed on the lower surface 8 side of the acrylic plate A as follows. A plate-shaped acrylic plate A (this type of acrylic plate is commercially available and easily available) formed of a smooth surface where almost no irregular reflection can be expected is formed into a desired size, and the end surface is provided with a light source. The light guide surface 2 having a smooth surface capable of introducing the light from is formed.

Next, by sandblasting, the lower surface 8 side of the acrylic plate A is formed into a uniform or substantially uniform rough surface over the entire surface as shown in FIG. 4 (A). The roughness of the rough surface formed by sandblasting can be adjusted by the size of the abrasive used for sandblasting, spraying strength, spraying time, and the like. Further, so-called diffusion plates and diffusion sheets having such a rough surface formed in advance are also commercially available, and those products may be used.

Next, as shown in FIG. 4 (B), the acrylic transparent ink 10 as an adhering substance that limits the irregular reflection amount is printed on the acrylic plate A formed into a rough surface by printing by silk screening. Apply on the lower surface 8. The transparent ink 10 is applied to the blank area according to the graphic pattern as shown in FIG. 3 while leaving the boat-shaped pattern. The application of the transparent ink 10 is not limited to printing by silk screening, but may be performed by other printing techniques, such as, for example, applying a photoresist polymer by swelling with a photoresist.

The transparent ink 10 reduces the amount of irregular reflection on the rough surface by the same effect as applying water to the frosted glass. Diffuse reflection can also be eliminated.

In the present embodiment, since the transparent ink 10 is applied by printing by silk screening, the silk screen mesh remains on the surface of the attached transparent ink 10 to give a rough surface having a certain degree of roughness. Is formed, and since the rough surface is also present in the underlayer, the diffuse reflection does not completely disappear in the portion of the lower surface 8 of the acrylic plate A where the transparent ink 10 is applied, and therefore, the moderate reflection does not occur. Diffuse reflection occurs and a low diffuse reflection portion is formed.

The rough surface left in the boat-shaped pattern is directly formed as the irregular reflection portion 9.

[Other Embodiments] FIGS. 5, 6, and 7 are enlarged views of a portion to which the transparent ink 10 is attached. When the transparent ink 10 is adhered to the rough surface, the transparent ink 10 may not completely soak into the concave portion of the rough surface, and bubbles 11 may remain as shown in FIG. Transparent ink 10
The surface may be formed by a rough surface 10a having a diffuse reflection effect, as shown in FIG.

Further, as shown in FIG. 7, the transparent ink 10 may be thinly applied in a state where the convex portions of the rough surface are exposed to some extent.

The attached matter is not limited to the acrylic transparent ink 10, but may be any substance that limits the amount of irregular reflection on the rough surface.
It can be changed appropriately. For example, a sheet-shaped body may be used, or a chemical agent that dissolves the convex portions of the rough surface to eliminate the irregularities may be used.

Further, the transparent ink 10 is not limited to being applied uniformly on the lower surface 8, but a plurality of types having different irregular reflection amounts can be obtained by appropriately changing the type of ink, the application method, the application form, and the like. The low diffuse reflection portions may be simultaneously provided in the lower surface 8 in a dispersed state.

The irregular reflection portion 9 is not limited to the boat-shaped pattern,
For example, it may be configured by triangles, a set of lines, dots, or the like. FIG. 8 and FIG. 9 show another embodiment of the irregular reflection portion 9 formed of a dot pattern. As shown in FIG.
The irregular reflection portion 9 is made up of large and small dots and is formed such that the closer it is to the end face 2, the smaller the diffuse reflection part 9 is. The irregular reflection portion 9 shown in FIG. 9 is composed of a dot pattern in which the transparent ink 10 is large and small and is applied with a plurality of dots. The dots of the transparent ink 10 are larger near the end face 2 and smaller as the distance from the end face 2 increases. Is formed. Therefore, the irregular reflection portion 9 shown in FIGS. 8 and 9 is formed such that the portion 8b farther from the end face 2 on the lower surface 8 has a larger amount of irregular reflection than the portion 8a close to the end face 2.

Further, the irregular reflection portion 9 is not limited to the one for making the illuminance of the illuminating surface of the light box uniform, and may be configured to make the illuminance strong or weak at a specific position on the illuminating surface.

The irregular reflection portions 9 may be formed on both front and back sides of the acrylic plate A.

The plate-like member made of a transparent or semi-transparent optical medium is not limited to the acrylic plate A, and can be changed appropriately. For example, glass materials and various synthetic resins (polyethylene, polyester, epoxy resin, etc.) may be used.

It should be noted that although reference numerals are given in the claims for convenience of comparison with the drawings, the present invention is not limited to the configurations of the accompanying drawings by the entry.

[Brief description of drawings]

FIG. 1 is a vertical sectional view showing the entire structure of an ultra-thin light box.

[Fig. 2] Operation diagram showing the principle of edge light

FIG. 3 is a perspective view showing the appearance of a plate-shaped body.

FIG. 4 is a cross-sectional view showing a method of forming a diffused reflection portion.

FIG. 5 is an enlarged view showing a portion to which an adhered matter is attached in the plate-shaped body of another embodiment.

FIG. 6 is an enlarged view showing a portion to which an adhered matter is attached in the plate-shaped body of another embodiment.

FIG. 7 is an enlarged view showing a portion to which an adhered matter is attached in the plate-shaped body of another embodiment.

FIG. 8 is a plan view showing another embodiment of the irregular reflection portion.

FIG. 9 is a plan view showing another embodiment of the irregular reflection portion.

[Explanation of symbols]

 A plate-like body L light source 2 light guide surface 8 surface 9 irregular reflection part 10 transparent ink

Claims (3)

[Claims] 1. A diffused reflection portion (9) is formed on at least one surface (8) side of a plate (A) made of a transparent or translucent optical medium, and light from a light source (L) is formed. A method for manufacturing a light guide body for an edge light, wherein a light guide surface (2) for introducing the inside of a plate-like body (A) is formed on an end surface of the plate-like body (A), the irregular reflection portion (9). ) Is formed, the surface (8) forming the irregular reflection portion (9) of the plate-like body (A) is formed into a uniform or almost uniform rough surface over the whole or almost the entire surface, and A method for manufacturing a light guide for an edge light, further comprising: attaching a deposit (10) that limits an amount of diffused reflection to a part of the rough surface (8). 2. The method for manufacturing a light guide for an edge light according to claim 1, wherein the roughened surface is formed by sandblasting. 3. The deposit (10) is transparent ink (1).
0), and the method of manufacturing an edge light guide according to claim 1 or 2, wherein the deposition of the deposit (10) is performed by printing.