Camera employing zone focusing

Details Camera employing zone focusing Camera employing zone focusing

1980-12-22

1982-06-29

Gellner, Michael L.

G03B 310

Patent

active

043369871

ABSTRACT:
A camera having a displaceable lens includes a lens position sensor and a converter for converting the sensor output into a representation of the in-focus distance associated with that lens position. The in-focus distance of the lens is then compared to the distance of the subject as determined by a rangefinder (e.g., an ultrasonic rangefinder). A visual indication is provided in the viewfinder prompting the user to manually change the position of the lens in a direction that improves the focus or, alternately, the relationship is used for controlling a motor to move the lens to a position at which the subject is in focus.

REFERENCES:
patent: 3522764 (1970-08-01), Biber et al.
patent: 4010479 (1977-03-01), Nobusawa
patent: 4124858 (1978-11-01), Erlichman
patent: 4178087 (1979-12-01), Shenk et al.
patent: 4182563 (1980-01-01), Biber et al.
patent: 4199244 (1980-04-01), Shenk
patent: 4199246 (1980-04-01), Miggli
patent: 4230401 (1980-10-01), Tokutomi et al.

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