JPS58146150A - Optical space transmission system - Google Patents

Abstract

PURPOSE:To make the movement of installing place of a terminal device easy and to protect human eyes from optical signals, by performing communication between an optical transmitter/receiver provided at the lower part of a terminal device and an optical transmitter/receiver provided on the wall of a room by means of optical signals. CONSTITUTION:The lower part of a terminal device T installed at an arbitrary position of an office 1 is provided with an optical transmitter/receiver SR. The lower part of a wall surface 3 of the office 1 is provided with many satellites S1-S9 including a light emitting element and a photodetector. Communication is performed by using a diffused light between the SR and the satellites S1- S9. Since the optical path of the light is formed along the floor, no light is made incident to a man in error. Further, even if an optical path of a certain part is intercepted by a pedestrian, the optical communication is continued with the optical paths of the other parts.

Description

Detailed Description of the Invention (1) Technical Field of the Invention The present invention relates to an improvement in an optical space propagation method that can eliminate the need for wiring communication cables to terminal devices. (2) Background of the Invention Recent years 2. Description of the Related Art Communication between terminal devices in an office and a center using optical signals is being considered.

In general terminal equipment, the original fiber cable and power cord are required for this purpose, but in offices, the layout is frequently changed, and the arrangement of the optical fiber cable and power cord is re-arranged each time such a change is made. For this reason, an optical space propagation method for optical communication through space has been developed. This method eliminates the need for at least the wiring of optical fiber cables to the terminal equipment, making it easier to respond to layout changes.
) Prior art and its problems Conventionally, the above-mentioned optical space propagation system has been considered to have the configuration shown in FIG. That is, a satellite s including a light emitting element and a light receiving element is installed on the ceiling 1 of an office, and a terminal T is installed on the floor 2.
Optical communication is carried out between the optical transceivers SR.

However, with this method, light is scattered in the air and there is a danger that it may enter the eyes, which poses a safety problem.

(4) Purpose of the Invention The present invention has been made in view of the above-mentioned problems, and an object of the present invention is to provide an optical space propagation system that is particularly safe for the eyes.

(5) An optical device characterized in that communication is performed by original signals through a space between the optical transmitter or optical receiver provided at the lower part of the W4 terminal device of the invention and the satellite provided at the lower part of the wall of the room. This is achieved by a spatial propagation method.

(6) Embodiment 8 of the invention An embodiment of the invention is shown in FIG. @S in figure 2! ~
S9 is a satellite, and the same members as in Fig. g1 are given the same reference numerals.

In the present invention, in order to improve the safety for eyes, Provided at the bottom of the wall surface 3, the terminal T[D
A transmitter/receiver SRi corresponding to this is provided protruding from the bottom of the device. and transmitter/receiver SR and satellite) 8□~S,
At the checkpoint, use diffused light.

As a result, the optical path of the light is formed along the floor surface, so
No light will accidentally enter your eyes.

Furthermore, even if a certain part of the optical path is blocked by a pedestrian, optical communication is possible using the other part of the optical path.

('7) Effects of the Invention As described above, according to the present invention, the optical path is formed near the floor surface, so safety for the eyes is improved.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing a conventional optical space propagation system, and FIG. 2 is a diagram showing an optical space propagation system according to the present invention. In the figure, SR is an optical transmitter/receiver, and 61 to S are satellite terminals.

Claims (1)

[Claims] An optical space propagation method characterized in that communication is performed by optical signals through space between an optical transmitter or optical receiver provided at the bottom of a terminal device and a satellite provided at the bottom of a wall of a room.