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Photodetection device

一种光检测装置、光电二极管的技术，应用在测量装置、光度测定法、光学辐射测量等方向，能够解决无法数字电路高精度信号处理等问题

Inactive Publication Date: 2010-11-24
SEIKO INSTR INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Second, since the output of the circuit is logarithmic, it is not possible to use a digital circuit for simple and high-precision subsequent signal processing

Method used

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Examples

Experimental program
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Embodiment Construction

[0020] figure 1 It is a figure for demonstrating the structure of the photodetection device 10 of this embodiment.

[0021] The photodetection device 10 is used, for example, as an illuminance meter for measuring ambient illuminance, and can be used, for example, to adjust the brightness of a backlight on a liquid crystal display screen of a mobile phone.

[0022] The photodiode 1 , which is a photoelectric conversion element generating a photocurrent corresponding to the illuminance of incident light, is connected in reverse bias, that is, its anode terminal is grounded, its cathode terminal is connected to an amplifier 13 , and is connected to a DC power supply 19 via a switch 17 . The switch 17 is composed of a switching element such as a transistor, and turns on or off the connection between the photodiode 1 and the DC power supply 19 according to a reset signal from the reset circuit 16 . The amplifier 13 is composed of an amplifier circuit such as an operational amplif...

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PUM

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Abstract

An electric charge storage method is used in which a photoelectric current generated in a photodiode is stored for a predetermined time period and the stored electric charge is amplified by an amplifier to obtain an output. Further, the storage time period is switched so that an output from the circuit has a characteristic of a piecewise linear approximation of a logarithm of an illuminance, permitting a sufficient resolution even in darkness.

Description

technical field [0001] The present invention relates to a photodetection device that converts photocurrent of a photoelectric conversion element into a voltage. Background technique [0002] The photodetection device converts photocurrent generated according to the illuminance of light into a voltage when light is incident on a photoelectric conversion element such as a photodiode or a phototransistor, and outputs the voltage. [0003] Photocurrent generated in photoelectric conversion elements such as photodiodes and phototransistors is proportional to illuminance. Therefore, in a conventional photoelectric conversion circuit that converts photocurrent into a voltage, there are output formats that output a voltage proportional to the illuminance of light and outputs that are proportional to the logarithm of the illuminance of light as output formats of the output voltage. form of voltage. [0004] For example, Figure 4 The photodetection device shown in Patent Document 1...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01J1/42G01J1/44H01L27/144
CPCG01J1/44H04N5/35527G01J2001/446H04N25/575
Inventor 藤井勇
Owner SEIKO INSTR INC
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