Automatic focusing device with frequency weighted amplification

Details Automatic focusing device with frequency weighted amplification Automatic focusing device with frequency weighted amplification

1982-08-16

1985-04-09

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

250204, G01J 120

Patent

active

045103844

ABSTRACT:
An optical system is automatically focussed by deriving an electrical signal which has a frequency distribution corresponding to the spatial frequency distribution of an image received from a focussing lens; applying to the electrical signal an amplification which is greater at high frequencies than at low frequencies; and adjusting the optical system to maximize the amplified signal.

REFERENCES:
patent: 4155004 (1979-05-01), Schulz
patent: 4336450 (1982-06-01), Utagawa et al.

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