Title:
DISTANCE MEASURING DEVICE FOR CAMERA
Document Type and Number:
Japanese Patent JP3481994
Kind Code:
B2
Abstract:
PURPOSE: To provide a distance measuring device for a camera wherein a distance measurement time can be shortened.
CONSTITUTION: A control circuit 80 controls switches 65-67, capacitors 63, 64 as integrating elements of an integrating circuit 60 for integrating voltage in response to brightness of pulse light from IRED 14 reflected on an object to be photographed are connected in parallel and fixed distance measurement precision can be obtained due to sufficient capacitance of the capacitors 63, 64 connected in parallel. Furthermore, after the voltage Vi output from the integrating circuit 60 reaches reference voltage of a level discrimination circuit 70, thereafter an integration time is shortened and a distance measurement time can be reduced because the capacitors 63, 64 are connected in series, the capacitance of the integrating element is decreased and the integration time is increased. Thereby it has an advantage in a shutter chance.
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Inventors:
Hiroyuki Saito
Michio Kawai
Akira Ito
Michio Kawai
Akira Ito
Application Number:
JP4584494A
Publication Date:
December 22, 2003
Filing Date:
March 16, 1994
Export Citation:
Assignee:
Seiko Precision Co., Ltd.
International Classes:
G01C3/06; G01S17/46; G02B7/32; G03B13/36; (IPC1-7): G01C3/06; G02B7/32; G03B13/36
Domestic Patent References:
| JP5280973A | ||||
| JP5107054A | ||||
| JP3272413A | ||||
| JP6435520A | ||||
| JP63292717A | ||||
| JP60125813A | ||||
| JP713066A | ||||
| JP6249650A | ||||
| JP6194567A | ||||
| JP7253321A |
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