Agfa-gevaert Ag

Norbert Burgermann

Alois Rieder

Horst Rossbach

A motion picture apparatus and preferably a motion picture projector. A rotary disc shutter is actuated by an electric drive and comprises a shutter sector. A claw mechanism controlled by the electric drive provides for transport of a film and the motion of the film is controlled by a solenoid having associated a solenoid plunger suitable for disengaging the claw transport mechanism after a frame transport phase. A position pulse generator provides a shutter position pulse depending on the position of the shutter sector. An output memory element connected to the electromagnet solenoid controls the energization of the electromagnet and in turn is connected to a switch and to the position pulse generator. Preferably additional memories are provided for performing functions such as controlling the advance and the reverse motion or providing for a timer or individual frame operation.

Memory controlled motion picture apparatus

The light-sensitive negative-feedback diaphragm control system of the motion-picture camera includes a stepper-motor coupled to the diaphragm, and a control circuit generating stepper-motor drive pulses. The control circuit includes an oscillator having a time-constant circuit which establishes the repetition frequency of the drive pulses. m different repetition frequencies can be established for the drive pulses, using m semiconductor switches each connected to the time-constant circuit. A program-step counter counts program-step-change signals generated during film transport, and a '1' signal appears on successive ones of the counter outputs. The outputs include, in succession, a fade-out output group, a rewind output group, and a fade-in output group. Each such output group contains m outputs. Logic circuitry connected to the outputs of the program-step counter imbalances the diaphragm control system and controls the film transport motor, to effect fade-out, then rewind, then fade-in in dependence upon the program-step count. The first through mth semiconductor switches are each connected to the first through mth outputs of the fade-out output group, respectively, and to the mth through first outputs of the fade-in output group, respectively. Accordingly, during fade-out, the repetition frequency of the drive pulses is progressively increased, and during fade-in decreased.

Motion-picture camera programmed for fadeover effects

The user selects a fadeover duration by selecting the number of pulses in a reference pulse packet registered by a reference counter. During film transport in either direction, a frame-pulse counter counts up a number of frame pulses equal to the number of pulses in the reference pulse packet, and then performs another frame-pulse counting cycle. Each frame-pulse counting cycle advances a program-step counter. Logic circuitry is responsive to the count on the program-step counter and, during the successive program steps, causes fade-out, film-rewind, and fade-in operations to be performed. The adjusting motor for the diaphragm operates at a speed inversely related to the number of pulses in the reference pulse packet, and the amount by which the adjusting motor changes the diaphragm setting during each frame-pulse counting cycle is always the same.

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Munich, Germany

Norbert Burgermann