Apparatus for varying picture size before or after film advance

Details Apparatus for varying picture size before or after film advance Apparatus for varying picture size before or after film advance

1978-02-02

1979-12-25

Gonzales, John

G03B 142

Patent

active

041803140

ABSTRACT:
The apparatus includes an image field limiting frame and at least one movable mask for the purpose of varying picture size in a line parallel to the direction of film travel and means to control film transport steps proportional to the picture window left open by the mask. It also includes means to directly transport the film in either the forward or reverse direction during picture size adjustment so that the forward edge of the film matches the forward edge of the picture window. In this manner, it is possible to execute picture size changes at anytime, even after operation of the film transport, without waste of film or overlap of sequential pictures.

REFERENCES:
patent: 2233238 (1941-02-01), Baumgartner
patent: 2247104 (1941-06-01), Takacs
patent: 2377341 (1945-06-01), Hannum

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