LIGHT RECEIVING DETECTION CIRCUIT

A light receiving detection circuit has a light receiving element configured to receive light emitted from a corresponding projection element, a current/voltage conversion circuit that converts a current signal passing through the light receiving element into a voltage signal, and a filter portion t...

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Bibliographic Details
Main Author DAIO MITSUAKI
Format Patent
LanguageEnglish
Published 09.09.2010
Subjects
AMPLIFIERS
BASIC ELECTRIC ELEMENTS
BASIC ELECTRONIC CIRCUITRY
DETECTING MASSES OR OBJECTS
ELECTRIC SOLID STATE DEVICES NOT OTHERWISE PROVIDED FOR
ELECTRICITY
GEOPHYSICS
GRAVITATIONAL MEASUREMENTS
MEASURING
PHYSICS
PULSE TECHNIQUE
SEMICONDUCTOR DEVICES
TESTING
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Summary:A light receiving detection circuit has a light receiving element configured to receive light emitted from a corresponding projection element, a current/voltage conversion circuit that converts a current signal passing through the light receiving element into a voltage signal, and a filter portion that has a plurality of stages. The filter portion has a high-pass filter and an amplifying circuit. The high-pass filter is able to be switched such that a time constant of the high-pass filter increases when the light receiving element receives light emitted by the corresponding projection element such that the time constant decreases when other projection elements except for the corresponding projection element emit the light.
Bibliography:Application Number: US20100712778