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Optical space transmission device using image sensor

An image sensor, space transmission technology, applied in free space transmission, transmission system, line of sight transmission and other directions, can solve the problems of enlarged pixel area, reduced signal readout speed, difficult adjustment of optical axis, etc., to improve high-speed communication, improve Effect of signal readout speed

Inactive Publication Date: 2009-07-22
PANASONIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when the area of ​​each pixel is constant, it is difficult to adjust the optical axis because the area of ​​the light receiving area (pixel area) is reduced.
In addition, if the area of ​​the light-receiving area (pixel area) is kept constant and the number of pixels is reduced, the adjustment of the optical axis can be easily performed, but the area of ​​each pixel will be enlarged.
As a result, the parasitic capacity of each pixel increases and the signal readout speed per unit pixel decreases.

Method used

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Examples

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no. 1 approach

[0071] figure 1 It is a diagram showing a configuration example of the optical space transmission device 100 according to the first embodiment. Such as figure 1 As shown, the optical space transmission device 100 includes a transmitting device 101 and a receiving device 102 . The transmitting device 101 includes a first light emitting unit 103 and a light receiving unit 104 . The receiving device 102 includes an XY address system image sensor (hereinafter simply referred to as an image sensor) 105 , a classification unit 106 , a storage unit 107 , a control unit 108 and a second light emitting unit 109 .

[0072] figure 2 is a diagram specifically showing the first light emitting unit 103 and the image sensor 105 . Such as figure 2 As shown, the first light emitting unit 103 is composed of one light source 103-1. The image sensor 105 has a pixel area composed of a plurality of pixels. The following description will be made assuming that the image sensor 105 has 16 p...

no. 2 approach

[0105] In the first embodiment, a case where an optical signal is transmitted along one optical axis is described, while a case where an optical signal is transmitted along a plurality of optical axes will be described in the second embodiment. Here, in the operation period of each pixel of the image sensor, there are a signal accumulation period for accumulating a signal and a signal readout period for reading out the accumulated signal. That is, each pixel cannot accumulate a signal during the signal readout period. Thus, by transmitting optical signals along a plurality of optical axes, it is possible to accumulate signals for pixels of another group during a period in which signals of a certain group of pixels are collectively read out (signal readout period). That is, according to the second embodiment, when performing data communication, by transmitting optical signals along a plurality of optical axes, it is possible to avoid a decrease in transmission speed due to a si...

no. 3 approach

[0126] In the first and second embodiments, description has been made on the premise that the positional relationship between the transmitting device and the receiving device does not change. On the other hand, in the third embodiment, in the optical space transmission device of the first and second embodiments, even if the positional relationship between the transmitting device and the receiving device changes and the optical axis deviates, data communication can be performed correctly. The composition is explained. Hereinafter, the optical space transmission device 200 according to the second embodiment will be described as an example.

[0127] In the third embodiment, the transmitting device 201 further includes a guide light source as a light source for optical axis correction. In addition, the first light emitting part 203 may also be equipped with a guide light source. The guide light source irradiates the pixel region of the image sensor 105 with a guide light signal,...

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Abstract

The invention provides an optical space transmission device by using an image sensor, aiming at realizing the high-speed communication for improving the signal read-out speed of the image sensor in the optical space transmission device by using the image sensor to reduce the tight optical axis adjustment. The ptical space transmission device transmits the optical signal from a transmission device to a a reception device, where the transmission device includes a first light emission unit having a light source for emitting an optical signal, the reception device including an XY address type image sensor having a pixel domain formed by a plurality of pixels and receiving an optical signal in the pixel domain, a classification unit for creating classification information for classifying pixels to which an optical signal is applied, into pixel groups, and a control unit for controlling the XY address-type image sensor according to the classification information and simultaneously reading out signals of pixels belonging to a pixel group.

Description

technical field [0001] The invention relates to an optical space transmission device which adopts an image sensor to realize high-speed optical space transmission. Background technique [0002] The optical space transmission method can realize high-speed data transmission without using optical fibers, so it is used as part of communication between buildings and wiring in buildings. In addition, since the optical space transmission method can transmit a plurality of optical signals spatially separated from each other, light sources and wavelength filters of different wavelengths as in the wavelength multiplexing method in optical fiber communication are unnecessary. Due to such characteristics, the optical space transmission method can use laser light without wavelength selection, LED with a wide emission spectrum, etc. as a light source. As a result, the optical space transmission method can realize high-speed data transmission at low cost. [0003] Figure 13 The configur...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B10/10H04B10/105H04B10/22H04B10/11H01L31/10H04B10/112
CPCH04B10/1121
Inventor 新保努武笹井裕之中曾麻理子
Owner PANASONIC CORP
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