Moving picture camera in which constant speed zooming is effecte

Details Moving picture camera in which constant speed zooming is effecte Moving picture camera in which constant speed zooming is effecte

1981-07-02

1983-02-01

Gellner, Michael L.

Optics: motion pictures

With focus control

G03B 310

Patent

active

043712410

ABSTRACT:
This specification discloses a moving picture camera provided with a cam cylinder for transferring movable lens groups, a motor for rotating the cam cylinder, a rotary type resistor having its adjusting shaft coupled to a cam ring through a gear train and to which a constant voltage is applied, a differentiation circuit for differentiating the output voltage of the resistor to detect any variation in rotational speed of the cam cylinder, and an electric circuit for inputting the output signal of the differention circuit to the motor with a zooming speed indication signal, thereby eliminating any speed fluctuation during zooming.

REFERENCES:
patent: 3621136 (1971-11-01), Stanwood
patent: 3972056 (1976-07-01), Tsujimoto et al.

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