Nihon Beru-haueru Kabushiki Kaisha (bell and Howell Japan, Ltd.)

Nihon Beru-haueru Kabushiki Kaisha

Bell & Howell Japan, Ltd.

Fumio Saito

To eliminate the recording of undesirable sounds which can occur upon stang a sound motion picture camera in which sound is recorded simultaneously as the picture is recorded, a circuit shorting switch is installed in parallel with the sound recording head, and a film transport motor control switch is arranged to function opposite to the circuit shorting switch but in cooperation with that switch to stabilize the amplifier before film movement begins.

Short circuit for recording head of simultaneous recording cine camera

Disclosed is a motion picture camera adapted to expose silent film and so film and having a control mechanism control the rate of film transport by intermittent and constant transporting devices to maintain a standard film transport speed. A high frequency differential transformer couples a power source and control circuitry including a rectifier circuit so that rectified output voltage of the transformer adjusts the intermittent mechanism responsive to the film loop size as detected by a film loop sensor arranged between the transporting devices. The output voltage varies from zero to some value when the loop sensor actuator is displaced from a position corresponding to an orientation when the film loop is of a standard size to modify the intermittent film transporting device to feed film at a rate to re-establish the film loop at the standard size. By changing a switch from sound to silent condition, the control circuit responsive to the loop sensor and the constant transporting device are disabled permitting the intermittent transporting device to be operated at the standard rate. Another standard rate can be selected for either sound or silent operating by actuation of a single switch.

Cine camera

Disclosed is a film speed control device for a single-system sound camera capable of simultaneous picture/sound recording in which an intermittent film transport mechanism at the exposure station and a constant speed film transport mechanism at a sound station having a magnetic recording head are driven synchronously by separate drive motors. In the control device, the impedance of a high frequency coil is changed in response to changes in the size of a film loop between the stations to control the rate of operation of the intermittent film transport so as to maintain constant the size of the film loop. The output of the high frequency oscillator is used for AC bias for the magnetic recording head, and is rectified for use as a power source for the recording amplifier.

Growing community of inventors

Kawaguchi, Japan

Fumio Saito