Multipoint autofocusing system

Photography – With exposure objective focusing means – focusing aid – or... – Having accumulation photoarray and time control means

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Details

396121, G03B 1332

Patent

active

058451552

ABSTRACT:
A multipoint autofocusing system has a plurality of light receiving devices each having a plurality of focus detection areas which receive light of object images and perform an integral operation in which the object light is converted to produce integrated electric charges. A detecting device is provided for detecting an integration time of each of the light receiving devices based upon commencement of the integral operation. An integration control device is provided for controlling the integration times to stop the integral operation of one of the light receiving devices when the integration time of the light receiving device reaches a predetermined integral value. The integration time of the light receiving device that first reaches the predetermined integral value is t1, and the integration time of the remaining light receiving devices that have not reached the predetermined integral value is t. The integration control device controls termination of the integral operation of the remaining light receiving devices in accordance with a ratio of t/t1.

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patent: 5664237 (1997-09-01), Watanabe
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patent: 5701524 (1997-12-01), Kusaka et al.
patent: 5721977 (1998-02-01), Yamawaki et al.
patent: 5731864 (1998-03-01), Hamada et al.

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