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Photo-detector, space information detection device using the photo-detector, and photo-detection method

A photoelectric detector and photoelectric conversion technology, applied in the direction of optical devices, measuring devices, photometry, etc., can solve the problems that the signal light cannot extract a large amount of received light output, the dynamic range of the signal light is reduced, and the control is complicated.

Inactive Publication Date: 2007-12-26
MATSUSHITA ELECTRIC WORKS LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, there is a problem that the control becomes complicated to obtain the received light output within an appropriate range by suppressing the dynamic range of the received light amount
However, in the presence of ambient light, the dynamic range of the signal light from the photodetector is reduced
When the photodetector is saturated, there is still the problem of not being able to extract a large amount of received light output for the signal light
In short, in the presence of ambient light, even when the amount of light emitted from the light emitting source is increased, or the light receiving time of the photodetector is prolonged, since the dynamic range of the signal light for the photodetector is reduced, and It is difficult to obtain a large enough signal-to-noise ratio

Method used

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  • Photo-detector, space information detection device using the photo-detector, and photo-detection method
  • Photo-detector, space information detection device using the photo-detector, and photo-detection method
  • Photo-detector, space information detection device using the photo-detector, and photo-detection method

Examples

Experimental program
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Effect test

no. 1 example

[0068] FIG. 1 shows a distance measuring device, which is a spatial information detection device using the photodetector 6 of this embodiment. In this distance measuring device, light is projected from a light emitting source 2 to a target space including an object 3 to be measured, and a photodetector 6 receives light including light reflected on the object from the target space, so as to obtain from the photodetector 6 a The received light output of the light quantity of reflected light. In order to measure the distance to the object by this configuration, a technique using the principle of triangulation, or a technique of measuring the flight time of light from the light emitting source 2 to the photodetector 6 is mainly utilized.

[0069] When the principle of triangulation is used, a parallel light beam of a predetermined pattern is projected from the light emitting source 2 to the target space, and the projected pattern on the target 3 is received by the photodetector 6 ...

no. 2 example

[0137] As shown in FIG. 6 , the present embodiment is characterized in that two accumulation electrodes ( 12 a , 12 b ) and two sustain electrodes ( 13 a , 13 b ) are formed for each of the photoelectric conversion portions 1 . That is, two accumulation electrodes (12a, 12b) and two sustain electrodes (13a, 13b) are defined as one group (or one pixel). Two sustaining electrodes (13a, 13b) are arranged spaced apart from each other. Two accumulating electrodes (12a, 12b) are arranged between the holding electrodes (13a, 13b). In addition, the accumulation electrodes (12a, 12b) are separated from each other by a gap "g", which is greater than the distance between each of the accumulation electrodes (12a, 12b) and the adjacent sustaining electrodes (13a, 13b). In this configuration, light is incident on the photosensitive portion 11a through the aperture between the light-shielding films 15 for covering the holding electrodes (13a, 13b). In addition, as shown in FIG. 7 , a light...

no. 3 example

[0169] In the second embodiment, since the gap "g" becomes wider, electrons and holes can be easily separated. In the case where the photodetector 6 is formed by arranging a plurality of photoelectric conversion parts 1 and the main functional layer 11 is also used as a vertical transfer transistor, since the accumulation electrodes (12a, 12b) and the holding electrodes (13a, 13b) ) and the potential well formed in the main functional layer 11 to transport carriers (electrons or holes), so there is a concern that when the gap "g" is excessively increased, the part for the gap "g" cannot be formed for Potential well for transporting charge carriers.

[0170] As shown in FIG. 9A, the present embodiment is characterized by forming a transfer electrode 22 between accumulation electrodes (12a, 12b). In this case, there is an advantage that electrons and holes are easily separated by increasing the distance between accumulation electrodes (12a, 12b), and also it is easy to transfer...

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Abstract

A photodetector is provided, which has the capability of preventing a reduction in dynamic range for a signal light even under a plenty of environmental light to stably obtain a received light output. This photodetector has an accumulation electrode and a holding electrode, which are formed on a photoelectric converting portion through an insulating layer, and a control unit for controlling timings of applying voltages to these electrodes and polarities of the voltages. One of electrons and holes generated in the photoelectric converting portion is accumulated in an accumulation region formed by applying the voltage to the accumulation electrode, and the other is accumulated in a holding region formed by applying the voltage to the holding electrode. Then, the electrons and holes accumulated in the accumulation region and the holding region are recombined, so that remaining electrons or holes not recombined are output.

Description

technical field [0001] The present invention relates to a technique for stably obtaining a received light output with respect to signal light as a detection object even in the presence of sufficient ambient light such as natural light from the sun and indoor lighting. Background technique [0002] In the past, various photodetectors such as photodiodes, phototransistors, and CCD image sensors were well known and widely used in the following applications: photosensors, which detect the presence or absence of objects based on changes in the amount of light received; optical communications, which use Light as a transmission medium; distance sensors for optically measuring distances by using the principle of triangulation or the time difference or phase difference between projected and received light; and image pickup devices for video and digital cameras. [0003] In such a photodetector, when the received light amount is within an appropriate range, a received light output hav...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01L31/10G01B11/00G01J1/02G01S17/32G01S17/89H01L27/146H01L27/148H01L31/00H03K17/945H04N25/00
Inventor 桥本裕介高田裕司
Owner MATSUSHITA ELECTRIC WORKS LTD
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