Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1990-01-31
1990-08-07
Laroche, Eugene R.
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
350 67, 350 691, 350258, 358201, 358199, 358206, 358474, 346160, G02B 2608, G02B 1700, G02F 133, G01D 1506
Patent
active
049462334
ABSTRACT:
In a light scanning apparatus, such as in a laser printer, an optical switch is provided between a light source and an acousto-optic light-modulating element for modulating the light according to data to be printed. The optical switch may be an acousto-optic light-modulating element as well. The optical switch blocks or passes the continuously input light from the light source according to a predetermined schedule, such as eight bits prior to the start of black dots and eight bits after the end of the block dots, or during a stand-by period. The time during which a fine light spot is focused on the acousto-optic light-modulating element is thus shortened. Accordingly, the life of the acousto-optic light-modulating element is increased because of the shortened duration of the focusing of the input light. Achievement of the fine spot size allows finer print-out resolution without sacrificing scan speed or the life of the element. The light spot focused on the optical switch is broad enough in size for the element to obtain to also achieve a long life.
REFERENCES:
patent: 3984171 (1976-10-01), Hotchkiss
patent: 4170028 (1979-10-01), DeBenedictis et al.
Fujitsu Limited
LaRoche Eugene R.
Shingleton Michael R.
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