JPH07210101A - Display body utilizing optical fiber and its production - Google Patents

Abstract

PURPOSE:To develop a wide angle display body utilizing an optical fiber. CONSTITUTION:The display body is constituted by arranging a transparent or semi-transparent surface plate 1 for plotting graphics, characters, etc., piercing a fiber hole 4 whose tip is conically formed within a range of 90 to 130 deg. center angle on the back of the plate 1, arranging a transparent or semi-transparent irradiation plate 3 made of synthetic resin and forming a reflection layer 6 on the back side of the plate 1, inserting an optical fiber 7 into the hole 4, filling a gap part formed by the tip of the hole 4 and the fiber 7 with a transparent bonding agent in a no-bubble state, and connecting a light source part to the fiber 7.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a display object such as an advertising signboard, a decorative plate, a sign light, a sign, a road sign, a guide light, and a warning light. The present invention relates to a display object capable of irradiating a surface plate on which characters and the like are drawn from the back side and a manufacturing method thereof.

[0002]

2. Description of the Related Art Conventionally, light emitting diodes have been used for display devices.
As a technique for diffusing light in the case of using a light source as a light source, (a) a lighting diode or a front lens provided with at least two light control units for diffusing or concentrating the light and changing the directivity of the light; Display device (actual fairness 2-83
35) or (b) a fish-eye lens-cut LED
A supplementary cut is made at the position corresponding to the central irradiation angle of the light source so as to increase the correction inclination angle from the center of each section toward the outer periphery, and the correction inclination angle is overlapped at the boundary of the section. Is proposed, and an LED railroad crossing lamp having a wide viewing angle and excellent visibility (Japanese Utility Model Publication No. 3-1844) is proposed.

However, if an attempt is made to manufacture such a display device using an optical fiber, the direction of light emission (orientation characteristic) of the optical fiber is very narrow, and when the front is set to 0 ° and the light is divided to the left and right, High brightness is maintained up to about ± 25 degrees to the left and right, but beyond that, it drops to 1/2 or less at about ± 45 degrees, and becomes almost invisible at ± 45 degrees or more. Therefore, it cannot be used for advertising signs, decorative boards, etc.
Various signs such as road signs that need to be visually recognized from a wide angle and signs for evacuation guidance also have a drawback that the use efficiency is poor because blind spots occur. Therefore, the optical fiber
At present, the display device using is rarely used in reality.

[0004]

SUMMARY OF THE INVENTION The present invention intends to develop a display object using an optical fiber based on the above-mentioned situation. The conventional narrow viewing angle is increased to about 180 degrees and the display is improved. Solves the problem that synthetic resin such as acrylic resin used as a plate and the end surface of the optical fiber become rough and light is scattered, resulting in poor utilization efficiency. The purpose is to increase efficiency.

[0005]

The display object of the present invention is a figure,
A transparent or semi-transparent surface plate on which characters and the like are drawn is arranged, and a fiber hole having a conical head portion with a central angle in the range of 90 to 130 degrees is formed on the back of the surface plate. , A transparent or translucent synthetic resin irradiation plate provided with a reflective layer on the back side is arranged, an optical fiber is inserted into the fiber hole of the irradiation plate, and the conical fiber-hole tip and light Fiber
It is characterized in that a void is formed with a transparent adhesive in a bubble-free state and a light source is connected to the optical fiber.

[0006]

The light emitted from the light source section passes through the inside of the optical fiber, is radiated from the tip toward the front, and once enters the diffusion layer of the irradiation plate through the transparent adhesive layer. Refractive index of transparent or translucent synthetic resin constituting the irradiation plate is 1.4 to 1.
6 and the shape of the head has a central angle of 90 to 1
Since it is a 30-degree conical shape, the incident angle is in the diverging direction, and is spread and radiated in the range of 360 degrees vertically and horizontally on the opposite side without any deflection.
A wide-angle orientation characteristic is obtained in the horizontal and vertical directions. The wide-angle light illuminates the surface plate on which figures, characters, etc. are displayed, so that the drawn figures, characters, etc. are clearly raised and the display effect is enhanced. At this time, the reflection layer re-emites the light leaking into the inside to the outside without going out to enhance the utilization efficiency of the light.

[0007]

EXAMPLES The present invention will be described below based on examples. As shown in FIGS. 1 and 2, a case where the present invention is used as an advertising lamp will be described as an example. Part 2
And an optical fiber-7 and a light source unit 8.

The surface plate 1 is formed by drawing figures and characters such as pictures and patterns, and is mainly used for advertisements, decorative plates, outside signs, signs,
It is intended to be used for road signs, guide lights, warning lights, etc., and its material must be a transparent or semi-transparent material that transmits light from the back, for example acrylic synthetic It is possible to use a resin in which a picture or a character is drawn, or a positive film of a photograph in which a landscape or the like is photographed or printed.

Next, as shown in FIGS. 3 and 4, the irradiation section 2 comprises an irradiation plate 3 having a fiber hole 4 formed therein, an adhesive layer 5 and a reflection layer 6, and first, the irradiation plate 3 is provided. Is a transparent or translucent synthetic resin such as polymethylmethacrylate called acrylic resin, styrene acrylonitrile, polycarbonate, polystyrene or the like, and is generally used as an irradiation plate having a thickness of about 2 to 10 mm. The thickness is set to maintain the physical strength of and colored as necessary.

Next, the irradiation plate 3 is provided with a fiber hole 4 for inserting the optical fiber 7 on the back side thereof, and a conical head 4a is formed at the tip of the fiber hole 4. The central angle of the conical head 4a is 90 to 130 degrees, most preferably 110 degrees. The transparent synthetic resin used for the irradiation plate 3 has a refractive index of, for example, acrylic resin nD.
= 1.492, polystyrene has nD = 1.59-1.
60, which is generally in the range of 1.40 to 1.60, and when it is formed into a conical shape, a wide-angle alignment characteristic that widely disperses the light from the optical fiber-7 is obtained. That is,
When the light from the optical fiber-7 enters the irradiation plate 3, n = sin θ ₁ / in accordance with the refractive index of the material forming the irradiation plate.
The light is refracted according to the law of sin θ ₂ (θ ₁ : incident angle θ ₂ : refraction angle), and at the time of incidence, if the shape of the irradiation plate 3 is made into a conical shape, it is changed to the dispersion direction by conversion of the incident angle, and its radiation direction Has a structure in which it spreads in the range of 360 degrees vertically and horizontally on the opposite side without deflection (see FIG. 5).

A diffusion layer 3a having a thickness of 0.1 to 2.0 mm, preferably 1.5 mm is formed between the conical head 4a and the surface of the irradiation plate 3. . This is because in order to diffuse the incident light by the conical head 4a and irradiate the entire surface plate 1 with light so as to bring up the figures and characters such as the pattern, pattern and the like drawn on the surface plate 1, the diffusion layer Since it is necessary to set 3a to an appropriate thickness and keep the amount of light to be irradiated at a certain level or more, if the thickness is 2.0 mm or more, the light from the optical fiber-is excessively dispersed and the amount of light is insufficient,
On the other hand, if the thickness is 0.1 mm or less, the physical strength of the layer cannot be maintained, so that 1.5 mm was most suitable experimentally.

Further, the reflection layer 6 is intended to improve the light efficiency by reflecting the light, which has come out from the optical fiber-7 and overflows to the back side of the irradiation plate, to the front surface, so that the reflection efficiency of the aluminum foil or the like is high. Use things.

Next, the optical fiber 7 to be mounted in the fiber hole 4 has a core 7a having a large refractive index and a clad 7b having a small refractive index, and has a high refractive index and goes outward. Accordingly, there are two modes, that is, a parabola becomes smaller, and either one may be used. Further, there are glass fibers and synthetic resin fibers as the materials, and the glass material has characteristics such as excellent transparency, and the synthetic resin material has excellent flexibility, etc., and is selected according to the purpose.
Also, there are various thicknesses, and diameters of around 0.8 mm are common, and it is economical to use such standard size, but of course, depending on the purpose, it can be freely used from thin to thick ones. Can be adopted.

Further, the conical head 4 of the fiber-hole 4
In the space between a and the optical fiber-7, a transparent adhesive is filled in a bubble-free state to form an adhesive layer 5, and the optical fiber-7 and the conical head 4a of the irradiation plate are formed. Are formed into a continuous body without voids. This is because when drilling the conical head 4a,
The end surface of the synthetic resin to be ground with a drill becomes a rough surface, and as a result, it becomes a frosted glass shape with reduced light transmittance, so by filling it with a liquid adhesive along the rough surface, This is because the irregularities of are smoothed and the light transmittance is improved. For the adhesive layer 5, it is desirable to use a transparent adhesive which is not a solvent-scattering type curing but a reactive type adhesive obtained by mixing a base material and a curing agent. An adhesive (trade name: Cemedine EP-330) can be used.

Further, the light source section 8 uses a light emitting diode, a white light bulb or the like as a light source, and collects the light source toward the end portion where the optical fibers 7 are bundled and transmits it to the fiber-fiber. or,
The light source unit 8 can adopt a mode of utilizing sunlight, and a light emitting diode is used as a power source in which a solar battery and a storage battery are combined.
It is also possible to connect the cables and collect the sun rays with a lens and send them directly to the optical fiber-7.

Explaining the manufacturing method, first, the irradiation plate 3 made of transparent or semitransparent synthetic resin is cut into a desired size,
A fiber hole 4 is bored from the back side of the irradiation plate with a tip angle of 100 to 130 degrees, leaving a diffusion layer 3a with a wall thickness of 0.1 to 2.0 mm (see FIGS. 6 and 7). . The tip of the drill should have a smooth surface with the highest possible accuracy, and in order to leave the diffusion layer 3a with a constant thickness, it should be drilled with a height-adjustable ball disk or the like.

Next, the main component of the reactive transparent liquid adhesive and the curing agent are mixed and defoamed to form a bubble-free state, which is inserted into the tip of the fiber hole 4 (see FIG. 8). ).
Defoaming is because the inclusion of bubbles hinders the progress of light. Therefore, defoaming can be easily performed by heating or vacuum suction in the liquid state before the curing proceeds. Further, before the adhesive is hardened, the tip 7c of the optical fiber 7 is mounted in the fiber hole 4 and fixed as it is to integrally form the irradiation plate 3 and the optical fiber 7 with the adhesive ( (See FIG. 9). Finally, such an optical fiber
7 are bundled into one, and the end portion of the optical fiber 7 is connected to the light source portion 8
Finish the production by facing the light source of.

The operation of this embodiment will be described. For example, in the case of an advertising lamp, first, when the switch of the light source unit 8 is turned on,
The light emitted from the light source unit 8 travels in the core 7a while being reflected by the cladding 7b, and is transmitted in the optical fiber 7 while being repeatedly refracted.

When the light reaches the tip 7c of the optical fiber 7, the light is radiated forward from there, and once enters the diffusion layer 3a of the irradiation plate 3 through the transparent adhesive layer 5. When the light enters the irradiation plate 3, it is refracted according to the refractive index of 1.4 to 1.6 of the transparent or semitransparent synthetic resin forming the irradiation plate 3, and the shape of the head 4a is conical, so that the incident angle is In the diffusion direction, it is radiated in the range of 360 degrees vertically and horizontally on the opposite side without being deflected (see FIG. 5). As a result, the orientation characteristic of the light emitted from the optical fiber changes, and a significantly wide-angled emission characteristic is obtained in the left-right and up-down directions.

Cone-shaped head 4 which obtains this wide-angle emission characteristic
As a result of the experiment, it was confirmed that the central angle θ of a is preferably in the range of 90 degrees to 120 degrees, and the most optimum value is 110 degrees.

When the light having the wide-angle emission characteristic obtained by the irradiation plate 3 is incident on the surface plate 1, it does not illuminate the entire surface plate due to its wide-angle property and does not cause spots of light and dark. Moreover, it is not too wide-angled to reduce the overall brightness. As a result, the pictures of people, landscapes, etc., and the letters representing advertising phrases and catch copies drawn on the surface plate 1 are clearly highlighted, and extremely high functions as advertising lights, decoration lights, and sign lights are exhibited. . Similarly, it is also suitable as a sign such as a road sign or a guide sign.

The light incident on the diffusion layer 3a is emitted in the diffusion direction.
Since it is formed in mm, the diffusion does not become excessive and the surface plate 1 is radiated while maintaining an appropriate irradiation amount. By the way,
When the diffusion layer 3a has a thickness of 2.0 mm or more, the amount of light is insufficient, and the overall feeling is dark.

By the way, when the conical head portion 4a is ground with a drill or the like at the time of punching, the end surface of the synthetic resin becomes a rough surface and becomes a frosted glass shape, and the light transmittance is greatly reduced. However, when the transparent adhesive layer 5 is inserted, the liquid resin flows into the rough surface and fills the irregularities, and the interface becomes a clean smooth surface,
The adhesive layer 5 and the conical head portion 4a become a continuous body having no void, and the light transmittance is remarkably improved. This effect also acts on the tip 7c of the optical fiber on the opposite side.

Most of the light incident on the diffusion layer 3a is emitted from the diffusion layer 3a to the outside as described above, but a part thereof is refracted inward and returns to the opposite side. When the light hits the reflective layer 6, the light is returned by the reflecting action and is emitted to the outside from the irradiation plate 3, so that the wasted light is not wasted and the light utilization efficiency is improved.

Further, in the manufacturing method, a fiber hole can be easily formed by drilling a hole on the irradiation plate 3 made of synthetic resin with a ball machine or the like, and a defoamed transparent adhesive is formed at the tip of the hole. Since it is sufficient to insert and attach the tip of the optical fiber to the adhesive layer and cure the adhesive integrally, mass production becomes easy.

[0026]

The present invention based on the above configuration and operation is
By improving the narrow orientation characteristics of the conventional optical fiber, it is extremely wide-angled and radiates 360 degrees in the left and right and up and down directions, so that the surface plate on which figures and characters such as pictures and patterns are drawn is the back side. It is possible to irradiate from above, and it is very suitable mainly for advertising lights, decoration lights, and sign lights, and also has a very useful effect that it can be widely applied to signs such as road signs and guide signs. Further, since a plurality of light emitting displays can be made by a single light source by using the optical fiber, the device becomes simple and economical. Further, the production thereof also has an excellent effect that mass production can be easily achieved.

[Brief description of drawings]

FIG. 1 is an overall perspective view of the display object of the present invention.

FIG. 2 is a side view of the display object of the present invention.

FIG. 3 is a partially cutaway vertical sectional view showing a main part of the display object of the present invention.

FIG. 4 is a partial cross-sectional view showing an irradiation unit and a fiber hole of the present invention.

FIG. 5 is a schematic vertical sectional view showing the action of the display object of the present invention.

FIG. 6 is a cross-sectional view showing a fiber-hole forming step of the manufacturing method of the present invention.

FIG. 7 is a cross-sectional view showing a state after a fiber-hole forming step of the manufacturing method of the present invention.

FIG. 8 is a sectional view of a step of bonding an adhesive layer and an optical fiber in the manufacturing method of the present invention.

FIG. 9 is a sectional view showing a state in which a surface plate and an irradiation unit are completed by the manufacturing method of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Surface plate 2 Irradiation part 3 Irradiation plate 3a Diffusion layer 4 Fiber-hole 4a Conical head 5 Adhesive layer 6 Reflective layer 7 Optical fiber-7a Core 7b Clad 7c Tip 8 Light source part

Claims (2)

[Claims] 1. A fiber in which a transparent or translucent surface plate on which figures, characters, etc. are drawn is arranged, and the head is formed on the back of the surface plate in a conical shape having a central angle in the range of 90 to 130 degrees. -A transparent or semi-transparent irradiation plate made of synthetic resin having a hole and a reflection layer on the back side is arranged, and an optical fiber is inserted into the hole of the irradiation plate and the conical shape A display object, characterized in that a transparent adhesive is filled in a void-free state in a void portion formed by a fiber-hole tip and an optical fiber, and a light source is connected to the optical fiber. 2. (a) A diffusion plate having a wall thickness of 0.1 to 2.0 mm and a conical drill having a head portion of 90 to 130 degrees on an irradiation plate made of a transparent or translucent synthetic resin. A fiber hole is bored, leaving (b) a reactive transparent adhesive in a bubble-free state at the head of the fiber hole, and (c) attaching the tip of the optical fiber to the fiber hole. , An irradiation plate and an optical fiber are integrally formed by a curing reaction of an adhesive, (d) the optical fiber and a light source are connected, and (e) a transparent or semi-transparent pattern in which a figure, a character or the like is drawn. A method of manufacturing a display object, which comprises sticking a transparent plate material.