JPH02231823A - Digital data communication method using light ray - Google Patents

Abstract

PURPOSE:To decrease the occurrence of an error due to an erroneous ray by detection a binary signal mark ray irradiating in a mark area depending on a delimiter mark analogically so as to discriminate H, L of the binary signal mark. CONSTITUTION:A light emission side A stimulates a delimiter mark ray P and a binary signal mark ray Q and rays P, Q, R, S radiate to a light receiving side B. A mirror C is arranged as required between the light emission side A and the light receiving side B to select a transmission path properly. The delimiter mark ray P indicates lots of delimiter marks KP arranged at a prescribed interval in 2 directions. Then the binary signal mark ray Q indicates the binary signal mark KQ in the said mark area E depending on the range surrounded by the delimiter mark KP in an analog quantity. The added mark ray R indicates the delimiter mark KR representing the data transmission range and the 2nd added mark ray S indicates the 2nd added mark KS representing the reading direction.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to remote communication of binary data using light beams. More specifically, the present invention relates to a method of remotely communicating digital data consisting of 2'' pieces of binary data (for example, binary data representing kanji characters made up of 24 JIS codes) in two directions using light beams.

○Prior Art Conventional communication using light beams uses pulse waves formed by blinking a light source, intermittent shading of a laser beam, etc.

Since it is a single pulse wave caused by blinking of the light beam, changes in H and L levels, etc., there is a problem that errors may occur when receiving the noise light beam. In addition, when 2' (n≧2) light beams are emitted simultaneously and 2n (n≧2) binary data are simultaneously transmitted, the receiving position of 2'' (n≧2) light beams can be accurately determined. There is a problem that errors may occur due to changes in the conditions of the ray path.

○Problems to be Solved by the Present Invention The present invention utilizes light beams to accurately transmit digital data consisting of 2" (n≧2) binary data in two directions, thereby transmitting digital data such as English, numbers, and kanji. The object of the present invention is to enable accurate and rapid remote transmission of code signals.

O Means for Achieving the Aforesaid Problems The present invention displays 2'' (n≧2) division marks for determining mark areas on the light emitting side at appropriate intervals in two directions, and A predetermined binary signal mark is displayed on the display, the classification mark and the binary signal mark are irradiated to the light receiving side, and the receiving side determines the binary signal mark for each mark area determined by detecting the classification mark in an analog manner. By determining binary data for each mark area, digital data consisting of 2' (n≧2) or more binary data is transmitted in two directions using light beams.

○Example The following will explain the embodiments shown in the drawings.

Referring to FIG. 1 showing the basic principle of the present invention, on the light emission side (transmission side) The mark light lsS) is generated, and the light beams P, Q, R, and S are emitted toward the light receiving side (receiving side) B. By arranging a mirror (reflecting wall surface, reflecting plate) C between the light emitting side A and the light receiving side B, if necessary, the transmission path can be appropriately selected.

The division mark optical helix P displays a large number of division marks KP arranged at predetermined intervals in two directions (in the embodiment, the X-axis direction and the Y-axis direction). The binary signal mark light #IQ displays the binary signal mark KQ as an analog value within the mark area E determined by the range surrounded by the division mark KP.

The additional mark light beam R displays an additional mark KR (X-axis direction base @ K Rl and Y-axis direction base line KR2) indicating the data transmission range, and the second additional mark light beam S displays a second additional mark KS indicating the reading direction. However, the reading direction can be omitted because it can be replaced by the additional mark KR, and the second additional mark KS is used to check whether the number of bits for transmission error detection (the number of H level binary signal marks) is even or odd. It can also be used as a parity check mark. Also,
The second additional mark KS detects whether it is the front side or the back side,
When the light is irradiated onto a wall, when it passes through a screen such as frosted glass, or when it is reflected by a mirror during light transmission,
This can be made to correspond to the fact that the displayed content is reversed.

Furthermore, by blinking the light source 4, at regular intervals, for example, the JIS fuji code "426 7 ゜゜" corresponding to ゛大''``saka''``ta''゛ro''
"3A65""4 2 4 0 ゜゜"
4 F 3 A'' can be transmitted sequentially as shown in Fig. 3. In this case, a serial number display mark 6 having 2n (n≧2) display areas is added instead of the second additional mark 4. Therefore, 1,2.3...,A,
By detecting data numbers such as B, C, etc. on the light receiving side, it is possible to detect a transmission interruption due to light blocking by an obstructing book, and it is possible to request retransmission of only the communication content of the missing data number.

On the light emitting side A, a single light lsX is directed to the mark KP. K
The light beams P, Ql, Q2...Qn, R, S are generated by passing through the filter 1 having Q, KR, KS, and the screen (wall surface, frosted glass, etc.) on the light receiving side B is generated.
However, as shown in FIG. 2, the binary signal mark light #l Q 1
, Q 2...Qn are generated at a constant timing, and changes in the binary signal mark in the other direction (X-axis direction) are displayed with a delay in the generation timing to generate 2" or more binary data in the binary direction. It can also be digital data consisting of.Second
A filter 1 in the figure has a light shielding section 6 for a classification mark beam P, an additional mark beam R, and a second additional mark beam S.
It consists of a fixed mask IA and a variable mask IB for the binary signal mark beam KQ, and by changing the contents of the variable mask IB according to the binary signal data to be transmitted, the changed part can be marked as a binary signal mark. It can be limited to only the part corresponding to the optical helix Q. In this case, the variable mask IB can be a data recording paper with binary marks recorded in a square shape, a flashing light source arranged in a square shape, etc., but the input that should be displayed in black and white using a liquid crystal display panel It can also be controlled electronically according to data.

The binary signal mark beams Ql, Q2...Qn can also be generated by moving a single laser beam vertically or horizontally and scanning at a constant timing.
Each mark area (Ell, E12...; E21, E2
2...-;Eml,Em2.=), the wavelength of the passing light is changed by the prism 5, and the light is focused by the lens system 6, so that a single light source generates light rays containing many different wavelengths, and the light is received. The object of the present invention can also be achieved by performing spectroscopy on the side (see FIG. 4).

Furthermore, instead of the filter 1 shown in FIG. 2, data of infinite length can also be transmitted by moving the digital data recording paper 3 shown in FIG. 5 in the horizontal direction at a fixed timing.

On the light receiving side, the intensity of the binary signal mark beam within the mark area within a predetermined range determined by the point irradiated with the division mark beam is determined by comparing it with the area of the mark area determined by the division mark. Binary data (H, L) is determined by analog detection in comparison with the level setting value.

Even if an error light source, such as instantaneous pulsed light from flashing lighting equipment, illuminates a screen on the light receiving side, the integrated value of the incident light dose in a predetermined mark area will be below the set level and will be detected as L level. Even if the amount of incident light decreases due to water droplets adhering to the screen or light beams passing through the water droplets, if the integrated value is maintained above the set value, it will be detected as an H level and error reception will be prevented.

Furthermore, even if the incident position of the light beam changes due to a change in the curvature of the transmission path, a change in the irradiation direction, etc., the classification mark KP irradiated on the screen on the light receiving side B will change simultaneously with the position change of the binary signal mark KQ. Since the individual binary signal marks KQ
The relative position of mark area E to is always constant,
No errors occur due to changes in the incident position.

In carrying out the present invention, the light rays are not limited to visible light, but include ultraviolet light. Of course, invisible light such as infrared rays may also be used.

○Effects of the Invention The present invention detects in an analog manner the binary signal mark beam irradiated within the mark area determined by the division mark to determine H-L of the binary signal mark.
In addition to reducing the occurrence of errors due to error light beams, even if the position and area of the mark area change due to changes in the irradiation position of the light beam, no transmission errors occur, and accurate data transmission can always be performed.

Furthermore, 2n (n≧2) binary signal marks can be displayed simultaneously in one direction, thereby increasing the transmission speed and quickly transmitting the data of the Kanji code.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram illustrating the principle of an optical digital data communication method according to an embodiment of the present invention. FIG. 2 is a schematic diagram showing the relationship between a binary signal mark beam and a filter. FIG. 3 is an explanatory diagram in the case of continuous communication. FIG. 4 is a schematic diagram showing the principle of a second embodiment of the invention. FIG. 5 is an explanatory diagram of a digital data recording paper used in place of a filter on the light emitting side (transmission side). 1... Filter 2... Screen 3... Data recording paper A... Light emitting side B... Light receiving side KP...・Division mark KQ...Binary signal mark KR...Additional mark KS...Second additional mark P...Division mark beam Q...・Binary signal mark ray R...Additional mark ray S...Second additional mark ray

Claims (3)

[Claims] (1) On the light emitting side, 2^n (n≧2) division marks for determining the mark area are displayed at appropriate intervals in two directions, and a predetermined binary signal mark is displayed in each mark area. Then, the classification mark and the binary signal mark are irradiated to the light receiving side, and on the light receiving side, the binary signal mark for each mark area determined by the detection of the classification mark is judged in an analog manner, and the binary signal mark for each mark area is determined. A digital data communication method using light beams, characterized in that data is determined and digital data consisting of 2^n (n≧2) or more binary data is transmitted in two directions using light beams. (2) Additional marks that can function as auxiliary marks such as a reading direction mark, a baseline mark to limit the reading range, a data number, a bit check mark, etc., from the light emitting side to the light receiving side, along with the classification mark and binary signal mark. A digital data communication method using a light beam according to claim 1, characterized in that the method comprises: irradiating a light beam. (3) The digital data communication method using a light beam according to claim 1, characterized in that the light source is blinked for each transmitted data to erase the emitted light beam from the light emitting source.