Equipment in film cameras

Details Equipment in film cameras Equipment in film cameras

1978-11-17

1980-08-19

Gellner, Michael L.

Optics: motion pictures

With sound accompaniment

Picture and sound synchronizing

G03B 3100

Patent

active

042181160

ABSTRACT:
An accessory apparatus for producing visible information on a film in a moving picture camera by exposure of the film through optical indicating elements comprises an actuating circuit arrangement for the optical indicating elements. The circuit arrangement includes a driving circuit for actuating the indicating elements and a control circuit associated with the driving circuit. The driving circuit is responsive to the control circuit and the control circuit is controllable in response to the picture frequency of the camera. It comprises an electrical signal transmitting stage, a signal recording stage connected to the transmitting state and directly receiving the signal therefrom, the driving circuit and the signal transmitting stage being energizable simultaneously, and a blocking circuit stage de-energizing the control circuit after passage of a pre-selectable number of picture frames after the standard picture frequency has been reached.

REFERENCES:
patent: 3188929 (1965-06-01), Higonnet et al.
patent: 3820076 (1974-06-01), Butts
patent: 3826566 (1974-07-01), Csontos
patent: 3838435 (1974-09-01), Mepham et al.
patent: 4050793 (1977-09-01), Hoadley

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