JPS5938790A - Display employing optical fiber bundle - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a display device using an optical fiber bundle, and in particular,
The present invention relates to a display device that can constantly output light without requiring an external power source.

FIG. 1 is an explanatory diagram of a conventionally used display device.

In Figure 1(a), a transparent plate 2 is printed with an opaque dye (the letter C in Aljabet), and a white light source lamp 1 is printed on the transparent plate 2.
The object is illuminated with light that allows the viewer to recognize specific letters, numbers, signs, etc. by the contrast between the background and the letters. Although this method is a commonly used display device, it naturally requires a light source lamp 1.

FIG. 1(b) shows a display device using an optical fiber bundle, and the cross section 5 of the optical fiber bundle 4 is circular, with the letter C at the end.
A transparent display board 6 with colored portions is attached. When sunlight 6 or the like is introduced into the optical fiber bundle 4 from the other end and irradiated in this manner, the letter C can be clearly recognized from the other end.

FIG. 1(C) shows one end of the optical fiber bundle 7 itself transformed into the shape of the letter C. When sunlight 3 is introduced from the other end, the light is emitted from the C-shaped end face formed by the optical fiber bundle, so a bright letter C is observed. In this case, the display board 6 becomes unnecessary.

Above are six methods of conventional display devices, namely direct character illumination, optical fiber transmitted light control, and
This is a modification of the optical fiber bundle itself, which is a means of transmitting light. However, although such a conventional display device lights the constant light source lamp 1, it is necessary to take in sunlight, and lighting the constant light source lamp 1 increases the electricity cost, and it is impossible to use sunlight at night. We still have no choice but to rely on electricity.

As mentioned in item 1 above, display devices using optical fibers can be installed freely due to their flexibility and can also use sunlight, so they are suitable for areas where there is no electricity supply or on remote islands. However, it has the disadvantage that it cannot be used at night.

The present invention aims to eliminate the drawbacks of the above-mentioned prior art and provide a display device that can be used at all times even at night.The present invention is characterized by an optical fiber having a display board attached to one end and branched at the other end. A fiber bundle has a solar cell circuit that receives sunlight in a solar cell, stores electricity, and lights a light source lamp, and has one branch end face of the fiber bundle facing the sun and the other branch end face facing the light source lamp. The structure is such that the display board is illuminated by sunlight during the day and by light from a light source lamp at night.

FIG. 2 is an explanatory diagram of a display device that is an embodiment of the present invention. The branch end 8a of the optical fiber bundle 8 has its end face facing the sunlight A, and the branch end 8b has its end face facing the light source lamp 1. Further, a display plate 6 is attached to the end face of the unbranched end 8C of the optical fiber bundle 8.

The solar cell circuit in which the light source lamp 1 is incorporated includes a solar cell 10 exposed to sunlight, a resistor 9, a diode 11, a battery 12, and a PNP transistor 1.
6 and a light source lamp 1. When the sun is shining in the daytime, light is taken in from the branched end 8a of the optical fiber bundle 8 to directly illuminate the display board 6 attached to the unbranched end 8c. At the same time, the solar cell 10 receives sunlight 6 via a diode 11 for preventing backflow.

Charge the battery 12. In this way, during the daytime solar cells 10
During charging, the base voltage of the PNP transistor 13 is equal to the terminal voltage of the solar cell 10, and the emitter voltage is a little lower than the terminal voltage of the solar cell 10 due to the voltage drop of the diode 11. 1
6 is reverse biased between the base and emitter, turning off and no collector current flows.

Therefore, the light source lamp 1 connected to the collector does not light up when the solar cell 10 is receiving light. Further, when a light emitting diode is used in place of the light source lamp 1, no light is emitted. Note that the diode 11 has the function of preventing overcharging of the battery 12.

Next, at night or when the sunlight 6 is below a predetermined intensity, the terminal voltage of the solar cell 10 decreases, and isometrically, the state is as if the solar cell 10 were removed from the circuit in FIG. Become. As a result, a forward current flows from the emitter to the base to the resistor 26 between the base and emitter of the PNP transistor 16, so that a collector current flows and the light source lamp 1 is turned on.

Therefore, the light entering from the branched end 8b of the optical fiber bundle illuminates the display panel 6 attached to the end surface of the unbranched end 8c.

At the unbranched end 8c, the other ends of the optical fibers of the branched ends 8a and 8b are uniformly mixed and formed into a circular shape, as shown in FIG. 1(c). It is also possible to collect them in the shape of . Even in this case 8 a.

It is necessary that the strands of the optical fibers 8b are evenly arranged.

In the display device of this embodiment, the bare wires of the branched optical fiber bundle are uniformly mixed and arranged at the other end and a display board is attached, and the end of the branched optical fiber bundle is connected to sunlight and a light source lamp of a solar cell circuit. By configuring the display panel to face the display panel, it is possible to constantly illuminate the display board with a direct sunlight source during the day and with light from a light source lamp during the night.

FIG. 3 is an enlarged view of the end face of the unbranched optical fiber bundle in FIG.
A black dot p indicates the optical fiber strand of the branch portion 8b. Figure 6(a) shows the case where they are uniformly mixed as described in the example of Figure 2.When this arrangement is consciously concentrated to draw the letter C, the result is Figure 6(b), which is displayed. The plate 6 becomes unnecessary.

Also, when a different arrangement is made as shown in Figure 3 (C),
Different displays can be displayed during the day and at night. Furthermore,
When the light source lamp is a colored lamp, the display can be performed in different colors in the case shown in FIG. 6(b). In this case, if the colored light is on during the day, it is possible to know that the solar cell 10 is malfunctioning.

A display device using such an optical fiber bundle 8 has the advantage that construction is easy because the optical fiber bundle is flexible, and that an external power supply is not required and display can be performed for a long period of time regardless of day or night.

The display device using the optical fiber bundle of the present invention illuminates the display board with sunlight during the day to charge the solar cell, and at night the display board is illuminated by lighting a light source lamp using a battery charged during the day. The effect is that it operates automatically for a long period of time.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram of a conventionally used display device, and FIG. 2 is an explanation of a display device that is an embodiment of the present invention 4.7, 8:
Optical fiber bundle, 9: resistor, 10: solar cell, 11: diode, 12: battery, 13: PNP) transistor. 1st (21st Pier 2 l 6th r

Claims (1)

[Claims] 1. An optical fiber bundle with a display board attached to one end and branched at the other end, and a solar cell circuit that receives sunlight in a solar cell, stores electricity, and lights a light source lamp, The optical fiber bundle is installed with one branch end facing the sun and the other branch end facing the light source lamp, and the display board is illuminated by the sunlight during the day and by the light from the light source lamp at night. 1. A display device using an optical fiber bundle, characterized in that it is structured as follows. 2. A display device using an optical fiber bundle according to claim 1, wherein the optical fiber bundle is an optical fiber bundle having the other end in which the optical fibers of the pair of branched end faces are uniformly bundled together. . 3. A display using an optical fiber bundle according to claim 1, wherein the optical fiber bundle is an optical fiber bundle having the other end in which each optical fiber of the pair of branch end faces is arranged and tied in a predetermined arrangement method. Device.