Abstract: A laser driven computer output microfilmer is operable in an optical registration and focus monitoring mode at a higher than normal (recording) frame repetition rate, to thereby avoid flickering in the eyes of the observer. Such increased repetition rate is implemented by selectively feeding a preprogrammed, abbreviated test pattern to the system input, and the test pattern signal also contains instructions for controlling the vertical scan or deflection mirror in a multi-stepped manner such that the mirror advances through or skips over groups of omitted or blanked frame rows.

Abstract: In a laser beam scanning system for recording information on a recording material employing a rotating mirror, a photodetector is provided to receive a laser beam in the start position of rasters. The photodetector supplies a synchronizing signal for making a synchronization between the laser beam scanning and a video signal supplied to a light modulator to modulate the laser beam. The frequency of base clock pulses is several times as large as that of the video clock pulses, whereby the start positions of the effective rasters on the recording material are aligned with each other.

Abstract: A device for recording a cathode-ray tube image comprising means for detecting temperatures of a thermal developing device and means for controlling either brightness of the cathode-ray tube or light emission time or a combination thereof. The change in developing temperature may be corrected by electrical means. The device provides prints of uniform density.