Focusing apparatus for optical systems

Details Focusing apparatus for optical systems Focusing apparatus for optical systems

1975-06-30

1977-03-01

Adams, Jr., Russell E.

Radiant energy

Ionic separation or analysis

Static field-type ion path-bending selecting means

250201, 250204, 352140, 356 4, G03B 708

Patent

active

040104796

ABSTRACT:
Focusing apparatus for use in optical systems, such as photographing cameras, is disclosed. The focusing apparatus of the invention comprises an electronic system for developing, through either a single or two separate channels, pulse trains, the number of pulses contained in the pulse trains being related to the brightness of the image forming light received by the optical system as focused on photoconductive elements. The electronic system further includes a comparing subsystem for comparing the number of pulses included in the two pulse trains and, in accordance therewith, generating an information output signal related to the focus state of the optical system. Alternatively, the output signal may control a drive system adapted to move the imaging lens portion of the optical system toward focus.

REFERENCES:
patent: 3631785 (1972-01-01), Perlman et al.
patent: 3682071 (1972-08-01), Hosoe
patent: 3829866 (1974-08-01), Nobusawa
patent: 3849643 (1974-11-01), Takeda
patent: 3856392 (1974-12-01), Harrison
patent: 3856407 (1974-12-01), Takeda et al.
patent: 3898676 (1975-08-01), Hosoe et al.

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