Digital continuous focus proportional controller

Details Digital continuous focus proportional controller Digital continuous focus proportional controller

1977-09-19

1979-07-10

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

250204, 354 25, G01J 120

Patent

active

041609042

ABSTRACT:
A digital continuous focus proportional controller for an automatic focus system of the spatial image correlation type determines whether focus correction is needed and in which direction and moves the primary optical member or lens with a proportional drive in accordance with these determinations.

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patent: 3274914 (1966-09-01), Biederman et al.
patent: 3684374 (1972-08-01), Humphrey
patent: 3783269 (1974-01-01), McConnell
patent: 3836772 (1974-09-01), Stauffer
patent: 3838275 (1974-09-01), Stauffer
patent: 3958117 (1976-05-01), Stauffer
patent: 4002899 (1977-01-01), Stauffer
patent: 4010479 (1977-03-01), Nobusawa
patent: 4078172 (1978-03-01), Wilwerding

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