JPS63176033A - Optical spatial data transmission system - Google Patents

Abstract

PURPOSE:To acturately and uniformly send a multiple address communication data by allowing a driving means to emit a fluorescent light in response to the multiple address communication data and a light receiving means to receive an optical signal superposed with the multiple address communication data from a fluorescent lamp. CONSTITUTION:The multiple address communication data is given to the fluorescent lamp driving circuit through a data interface 14 and the fluorescent light driving circuit 13 emits the fluorescent light 3 based on the multiple address communication data through modulation. The optical signal from the fluorescent lamp 3 propagates through a space and is received by a photodetector 2, where the signal is converted into an electric signal to attain demodulation or the like, and the message and data for multiple address communication are given to a data processing terminal equipment 1. The processing for the multiple communication data is subjected to interruption control. Thus, it is possible to send the message and data required to be sent simultaneously to plural data processing terminal equipments 1 without having the limitation of the installed location of the terminal equipment 1.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an optical spatial data transmission system that transmits data using light through space in an area (for example, a data processing room) where a plurality of data processing devices are installed. .

[Conventional technology]

Conventionally, as optical communication systems based on spatial propagation of optical signals, data transmission systems between a plurality of buildings, systems using spatial optical modems, etc. are known. In a data transmission system between buildings, an electrical/optical conversion element matched to the wavelength of the signal used is used in the transmitting section, and a condenser, optical/electrical converting element, etc. are used in the receiving section. It will be done. Further, in a data transmission system using a spatial optical modem, for example, an electric/optical conversion element whose emission wavelength is in the 0.8 μm band and an optical/electrical conversion element are used.

In such conventional systems, a typical electrical/optical conversion element used in the transmitter is, for example, 0.8μ.
There are m-band light emitting diodes (LEDs). If the optical signal output is insufficient, a semiconductor laser (LD)
) etc. are used. In addition, the light receiving part has a thickness of 0.8 μm.
A strip silicon photodiode (PD) is often used.

By configuring the space transmission system in this way, broadcast communication can be performed without using signal lines. Therefore, it is particularly suitable when a large number of data processing terminal devices are installed in a data processing area or when the number of data processing terminal devices is frequently increased or decreased.

(Problems to be Solved by the Invention) However, the above conventional system has the following problems.

The first problem is that the light emitting output of the optical transmitter (for example, an electrical/optical conversion element) in the conventional system is low. For this reason, data transmission may not be possible when the data processing terminal device is far from the transmitter, and noise is rarely introduced.

The second problem is that the optical transmitter in the conventional system has strong directivity in the output pattern.

For this reason, in an area where a large number of data processing terminal devices are installed, data cannot be sent evenly to each terminal device.

SUMMARY OF THE INVENTION An object of the present invention is to provide an optical spatial data transmission system that can accurately and evenly transmit broadcast communication data in an area where a plurality of data processing devices are installed.

[Means for solving problems]

The optical space data transmission system according to the present invention is provided with fluorescent lamps in an area where a plurality of data processing devices are installed, and a driving means for driving the fluorescent lamps to emit light based on predetermined broadcast communication data. Each of the data processing devices has a light receiving means for receiving an optical signal from a fluorescent lamp, and is characterized in that it performs data processing based on the received optical signal.

[Effect]

Since the optical space data transmission system according to the present invention is configured as described above, the driving means operates to drive the fluorescent lamp to emit light according to the broadcast communication data, and the light receiving means operates to drive the fluorescent lamp to emit light according to the broadcast communication data. It moves to receive optical signals that are heavily clouded with data.

〔Example〕

Hereinafter, the present invention will be described in detail with reference to FIGS. 1 and 2 of the accompanying drawings. In addition, in the description of the drawings, the same elements are given the same reference numerals, and redundant description will be omitted.

FIG. 1 is a perspective view of a system according to one embodiment. As shown in the figure, four data processing terminal devices 1A to 1D are installed in a data processing area (for example, a data processing area).

On top of these terminal devices 1A to 1D, light receivers 28 to 2D composed of, for example, photodiodes are installed (
is being pulled.

A fluorescent lamp 3, which is also used for illumination, is attached to the ceiling of the data processing area. This fluorescent lamp 3 is connected to a fluorescent lamp drive circuit (shown in FIG. 2) via a lead wire 4.

FIG. 2 is a block diagram showing the configuration of the embodiment shown in FIG. 1. However, in this figure, three of the four terminal devices shown in FIG. 1 are omitted. As shown in the figure, the data processing device 1 is connected to the light receiver 2 via a data connection line 11 and an interrupt control line 12. Fluorescent lamps also used for lighting 4
is connected to a fluorescent lamp drive circuit 13 via a lead wire 4, and the fluorescent lamp drive circuit 13 is connected to a host computer (not shown) via a data interface 14.

Next, the operation of the above embodiment will be explained.

Broadcast communication data sent from the host computer is sent to the fluorescent lamp drive circuit 13 via the data interface 14.
given to. Therefore, the fluorescent lamp drive circuit 13 modulates the fluorescent lamp 3 to emit light based on the broadcast communication data. Here, unlike an incandescent lamp, the fluorescent lamp 3 can be modulated at a frequency of about 10k)12. Therefore, transmission speeds of about 2.4 kBps, 4.8 kBps, or 9.5 k13 ps, which are used in normal data processing, are fully possible. Therefore, it is fully possible to use the fluorescent lamp 3, which is originally used for illumination, as an optical transmitter for data transmission.

The optical signal from the fluorescent lamp 3 propagates through space and is received by the light receiver 2, where it is converted into an electrical signal and demodulated.

In this way, messages and data for broadcast communication are provided to the data processing terminal device 1. Processing of this broadcast communication data is performed by interrupt control. That is, each terminal device 1 processes data provided via a data communication circuit (not shown), and when a broadcast message is received, an interrupt control signal is provided from the interrupt control line 12. Then, the terminal device 1 performs predetermined data processing based on the broadcast communication data provided via the data connection line 11.

According to this embodiment, by performing interrupt processing on each terminal device 12, multiple data can be transmitted independently of the data line connected to the data processing terminal device 12 and at the same transmission speed as a conventional modem. It becomes possible to transmit messages and data to be simultaneously transmitted to the processing terminal device 1 without being restricted by the installation location of the terminal device 1.

The present invention is not limited to the above embodiments, and various modifications are possible.

Broadcast communication data is not limited to that given from the host 1 to the computer. For example, by providing each terminal device within a data processing section (area) with a function of outputting broadcast communication data, broadcast communication may be performed between the terminal devices. Also, the number of fluorescent lights is not limited to one,
There may be two or more.

(Effects of the Invention) As described above in detail, according to the present invention, the driving means operates to drive the fluorescent lamp to emit light according to the broadcast communication data, and the light receiving means operates to drive the fluorescent lamp to emit light according to the broadcast communication data, and the light receiving means receives the broadcast communication data from the fluorescent lamp. Since it works to receive superimposed optical signals, it is possible to accurately and evenly transmit broadcast communication data in an area where a plurality of data processing devices are installed.

In particular, the present invention has the particular advantage of being able to meet diversified communication requests. In other words, the conventional data processing terminal equipment connects hosts 1 to 1 through double line or half duplex line.
It is connected to a large computer and performs data communication. Therefore, in a data processing department where a large number of data processing terminal devices are installed, there are many requests for messages to be simultaneously transmitted to each terminal device. However, according to the present invention,
In addition to the conventional data line, it becomes possible to set up a data transmission line that allows broadcast communication directly from the host computer to all terminal devices. Therefore, it is possible to respond to more diversified communication requests from users of data processing terminal devices than in the past.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of an optical spatial data transmission system according to an embodiment of the present invention, and FIG. 2 is a block diagram of the optical spatial data transmission system according to an embodiment of the present invention. 1.1A~1D...Data processing terminal device, 2.2A~
2D... Light receiver, 3... Fluorescent lamp, 11... Data connection line, 12... Interrupt control line.

Claims (1)

[Claims] 1. In an optical space data transmission system that transmits data by light through space in an area where a plurality of data processing devices are installed, there is provided a fluorescent lamp and a predetermined broadcast communication data transmission system using the fluorescent lamp. and a driving means for driving light emission based on the fluorescent lamp, and each of the plurality of data processing devices has a light receiving means for receiving an optical signal from the fluorescent lamp, and performs data processing based on the received optical signal. An optical spatial data transmission system featuring: 2. The optical space data transmission system according to claim 1, wherein the predetermined broadcast communication data is provided from a host computer. 3. Each of the plurality of data processing devices has an output means for outputting the broadcast communication data, as claimed in claim 1.
The optical spatial data transmission system described in Section 1.