Optical scanning device for scanning a record carrier with a sca

Details Optical scanning device for scanning a record carrier with a sca Optical scanning device for scanning a record carrier with a sca

1994-12-15

1996-08-20

Allen, Stephone

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

369 97, H01J 314

Patent

active

055481140

ABSTRACT:
An optical scanning device for scanning a tape-like record carrier. The device includes an optical system for focusing a radiation beam at the record carrier, which radiation beam causes a scanning spot to occur on the record carrier. The device also includes a rotary polygon mirror which causes the scanning spot to be displaced transversely to the direction of the tape with a specific repetition rate. The tape-like record carrier is moved with a certain velocity in the longitudinal direction of the tape relative to the scanning device. In this manner, the record carrier is scanned in accordance with a track pattern formed by a longitudinal path of substantially parallel tracks which have a substantially constant track pitch and a track direction transverse to the longitudinal direction of the record carrier. During operation, vibrations occur which cause displacements to occur of the scanning spot over the recording layer transverse to the scanning direction. The relation between velocity and repetition rate is selected such that the amplitude of the displacements of the scanning spot, which displacements have a frequency exceeding the repetition rate, is smaller than the track pitch. As a result, the track pitch throughout the length of the tracks remains substantially constant without use of a controller.

REFERENCES:
patent: 4901297 (1990-02-01), Komatsu et al.
patent: 5171984 (1992-12-01), Van Rosmalen
patent: 5237556 (1993-08-01), Pierce

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