Pulse modulation light detection device, method, and electronic apparatus

A light detection device and pulse modulation technology, which can solve problems such as false detection, weakened light receiving intensity, and misoperation, etc.

A light detection device and pulse modulation technology, which can solve problems such as false detection, weakened light receiving intensity, and misoperation, etc.

CN1779489AInactive Publication Date: 2006-05-31SHARP KK
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  • Pulse modulation light detection device, method, and electronic apparatus
  • Pulse modulation light detection device, method, and electronic apparatus
  • Pulse modulation light detection device, method, and electronic apparatus

Examples

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Embodiment Construction

[0037] Below, refer to Figure 1 to Figure 5 , one embodiment of the pulse modulation type photodetection device and the pulse modulation type photodetection method of the present invention will be described. That is, in the pulse modulation type photodetection device of this embodiment, such as figure 1 As shown, there are provided: an oscillation circuit 11, which generates and outputs a reference clock (hereinafter, abbreviated as "CLK") signal (A1) of a predetermined wavelength by means of a crystal oscillator, etc.; and a synchronous timing circuit (pulse generation circuit) 12, which generates A pulse signal (B1) based on the above reference CLK signal.

[0038] In addition, in the pulse modulation type photodetection device, there are provided: a light-emitting element drive circuit 13 that generates a light-emitting element drive signal corresponding to the above-mentioned pulse signal; and a light-emitting element 14 that drives from the light-emitting element to L...

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Abstract

The invention provides a pulse modulation type light detection device. The pulse modulation type photodetection device has: a light emitting element emitting pulsed light synchronized with a pulse signal; a light receiving element receiving reflected light or transmitted light of an object to be detected by means of the pulsed light; a light-receiving signal of the light-receiving element to detect the presence or absence of an object; and a synchronous timing circuit to generate a pulse signal for causing pulsed light to be emitted multiple times in one cycle. The signal processing circuit detects the plurality of pulses, and outputs a detection signal indicating whether or not the object exists.

Description

technical field [0001] The present invention relates to a pulse-modulated photodetection device and a pulse-modulated photodetection method for emitting pulse-modulated light from a light-emitting element and detecting the presence or absence of an object, and more particularly to a FA (factory automation) and A pulse-modulated light detection device and a pulse-modulated light detection method suitable for OA (office automation) equipment and electronic equipment such as entertainment equipment for detecting coins and marbles. Background technique [0002] In FA and OA equipment such as copiers and printers, and electronic equipment such as entertainment equipment such as game machines, it is sometimes necessary to detect the passage of objects (such as recording paper, coins, marbles, etc.) in a predetermined path. A photodetection device that detects an object with light is relatively suitable for the above-mentioned detection because it does not touch the object. [000...

Claims

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Application Information

Patent Timeline
31 May 2006
Publication
CN1779489A
IPC
G01V8/10
CPC
G01S7/497; G01S17/10; G01S17/04
Inventors
丸山康弘