Focus control system with dual scan

Details Focus control system with dual scan Focus control system with dual scan

1976-10-01

1977-11-22

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

250204, 354 25, 356 4, G01J 120

Patent

active

040597563

ABSTRACT:
An automatic focus system of the spatial image correlation type uses a dual scan technique. During a first scan, the amplitude of the major extremum in the correlation signal is stored. During the second scan, this stored amplitude is used to pick out the point of best focus.

REFERENCES:
patent: 3736057 (1973-05-01), Harvey
patent: 3967110 (1976-06-01), Rogers et al.
patent: 4004852 (1977-01-01), Pentecost
patent: 4011446 (1977-03-01), Swanberg

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