Automatic focusing device with low light contrast inhibiting mea

Details Automatic focusing device with low light contrast inhibiting mea Automatic focusing device with low light contrast inhibiting mea

1983-12-06

1986-10-14

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

250204, G01J 120

Patent

active

046174591

ABSTRACT:
When the disclosed automatic focusing device detects that a computed distance measurement is inaccurate, it shifts the lens a predetermined length to a new position for another measurement. A system senses when the inaccuracy arises from an overly dim scene, for which a distance cannot be properly measured in any case, and inhibits the successive shifts to avoid waste of energy.

REFERENCES:
patent: 4247762 (1981-01-01), Wilwerding
patent: 4250377 (1981-02-01), Wilwerding
patent: 4333007 (1982-06-01), Langlais et al.
patent: 4358675 (1982-11-01), Frazier et al.
patent: 4394569 (1983-07-01), Nakamura

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