Auto focus system

Details Auto focus system Auto focus system

1984-08-28

1986-10-07

Rubinson, Gene Z.

Facsimile and static presentation processing

Facsimile

Recording apparatus

354407, G03B 708

Patent

active

046162640

ABSTRACT:
An autofocus system and method for automatically adjusting the focus of a lens system. The autofocus system selects video signals, having a frequency in a preselected range and drives the lens system until the voltage of the frequencies in the preselected range is maximized. The preselected frequency range has been found to be to 0.8 Mhz to 1 Mhz.

REFERENCES:
patent: 3896304 (1975-07-01), Aoki
patent: 4133606 (1979-01-01), Hosoe
patent: 4320417 (1982-03-01), Hanma
patent: 4354204 (1982-10-01), Kimura
patent: 4392726 (1983-07-01), Kimura
patent: 4411505 (1983-10-01), Sakai
patent: 4484225 (1984-11-01), Bishop
patent: 4500925 (1985-02-01), Hanma

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