Camera shutter

Details Camera shutter Camera shutter

1977-03-16

1978-02-14

Griffin, Donald A.

Optics: motion pictures

With automatic diaphragm control

G03B 1918

Patent

active

040735826

ABSTRACT:
A camera shutter has at least one diaphragm leaf which is mounted for angular displacement about a pivot axis. A cam element is mounted for rotation on the output shaft of a motor and is provided either with a planar surface formed with a spiral cam groove or with a conical surface formed with a conically spiral cam groove. A pin is fixed to the diaphragm leaf at a location laterally offset from the pivot axis and tracks the cam groove.

REFERENCES:
patent: 3024700 (1962-03-01), McClellan
patent: 3176312 (1965-03-01), Reinsch
patent: 3188935 (1965-06-01), Lieser et al.
patent: 3277803 (1966-10-01), Fukuoka
patent: 3542462 (1970-11-01), Bertram

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