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Free-space optical communication device

A space communication and optical signal technology, applied in the direction of free space transmission, short-distance systems, electrical components, etc.

Inactive Publication Date: 2008-12-24
SHARP KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] However, in conventional optical space communication devices, on the premise of peer-to-peer communication, only one kind of information can be transmitted through infrared signals

Method used

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Experimental program
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Embodiment 1

[0032] FIG. 1 is a block diagram showing Embodiment 1 of the optical space communication device of the present invention. The optical space communication device 11 of this embodiment includes a light receiving element 12 and a signal selection unit 13 . The light-receiving element 12 receives the communication signal L0, and photoelectrically converts the communication signal L0, which is the light-receiving signal, into an electrical signal S0. The communication signal L0 includes two kinds of infrared light signals L1 and L2 representing different information.

[0033] The infrared optical signals L1 and L2 are, for example, audio signals or music signals, and are optical signals pulse-width-modulated or pulse-density-modulated based on different pieces of information. Then, these infrared light signals L1 and L2 are time-divisionally synthesized to form a communication signal L0. Accordingly, the communication signal L0 includes infrared light signals L1 and L2 representi...

Embodiment 2

[0043] Fig. 3 is a block diagram showing Embodiment 2 of the optical space communication device of the present invention. The optical space communication device 21 of this embodiment includes a light receiving element 22 and a signal selection unit 23 . The light-receiving element 22 receives two kinds of infrared light signals L1 and L2 respectively representing different information, and photoelectrically converts these light-receiving signals, that is, the infrared light signals L1 and L2 into an electrical signal S0 . The signal selection unit 23 receives an electrical signal S0 from the light receiving element 22 , demodulates and separates the signal S1 and the signal S2 from the electrical signal S0 , and selectively outputs the signal S1 , the signal S2 , and the electrical signal S0 .

[0044] The illustrated signal selection unit 23 includes a signal switching unit 231 . Moreover, the signal switching unit 231 can select to output the signal S1 corresponding to the ...

Embodiment 3

[0049] Fig. 4 is a block diagram showing Embodiment 3 of the optical space communication device of the present invention. The optical space communication device 31 of this embodiment includes a light receiving element 32 and a signal selection unit 33 . The light-receiving element 32 receives two kinds of infrared light signals L1 and L2 respectively representing different information, and photoelectrically converts these light-receiving signals, that is, the infrared light signals L1 and L2 into an electrical signal S0 .

[0050] The signal selection unit 33 receives an electrical signal S0 from the light receiving element 32 , demodulates and separates the electrical signal S0 into a signal S1 and a signal S2 , and outputs the signal S1 , the signal S2 , and the electrical signal S0 .

[0051] The infrared optical signals L1 and L2 are optical signals subjected to pulse width modulation or pulse density modulation, and are transmitted respectively. Therefore, the modulation...

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Abstract

An optical space communication device comprise: an light receiving element, which receives a communication signal containing multiple infrared light signals respectively representing different information and converts the communication signal to an electrical signal by way of electro-optical conversion, and a signal selection unit, which receives the electrical signal from the light receiving element as input, extracts respective signals corresponding to the infrared light signals from this electrical signal, and individually outputs the electrical signal and the signals corresponding to the infrared light signals.

Description

[0001] This application claims priority based on Japanese Patent Application No. 20007-162782 filed in Japan on June 20, 2007 under Article 119(a) of the (Japanese) Patent Law. By mentioning here, its entire content is incorporated into this application. technical field [0002] The present invention relates to an optical space communication device used in electronic equipment. Background technique [0003] As is well known, IrDA 1.0 and IrDA 1.1 were standardized in 1994 by the so-called IrDA (Infrared Data Association) method of infrared space communication that enables wireless communication between different electronic devices using infrared light signals. In standard IrDA1.0, a physical layer of SIR (9.6K to 115Kbps) is specified, and in standard IrDA1.1, a physical layer of FIR (4Mbps) is specified. This enables high-speed communication (for example, refer to JP-A-2005-277054, JP-A-2005-318375, etc.). [0004] Furthermore, the Ir-Simple protocol, which simplifies the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B10/10H04B10/06H04B10/11H04B10/114H04B10/516H04B10/524H04B10/61
CPCH04B10/1149
Inventor 国江明守
Owner SHARP KK
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