Photocopying – Including fiber optics
Patent
1975-12-18
1977-07-12
Moses, Richard L.
Photocopying
Including fiber optics
240 1EL, 355 67, G03G 1500
Patent
active
040350703
ABSTRACT:
Apparatus and method for providing a structured distribution for charge stored on a photoreceptor element. An optical element located adjacent to the photoreceptor, includes two generally parallel reflecting surfaces, one surface being partially reflecting and one surface being substantially totally reflecting. A narrow collimated beam of radiation, introduced at an angle to the reflecting surfaces, produces multiple reflections between the reflecting surfaces of the optical element. A portion of the collimated beam exits from the cavity through the partially reflecting surface with each reflection therefrom. The resulting array of substantially parallel light beams is arranged to scan a surface of a photoreceptor having a charge stored thereon. The photoreceptor charge in the region of the incident light beam is dissipated by the impinging radiation resulting in a modulation or structuring of the stored charge. This photoreceptor charge modulation can be utilized to improve image reproduction.
A filter can be interposed between the optical cavity and the photoreceptor to correct for the gradually decreasing intensity of each successive array beam exiting from the optical element, the decreasing beam intensity the result of loss during previous reflections.
A primary optical element can be utilized in conjunction with a plurality of secondary elements to reduce the total path length of the scanning radiation beam, thereby minimizing the spreading of the beams resulting from multiple reflections. Further, by the interlacing of secondary element beam arrays, the beam density from each secondary element can be greater than the beam density of the scanning radiation beam array.
When the collimated radiation beam is operated continuously, a line pattern is produced on the stored charge of the moving photoreceptor. When the collimated radiation beam is operated in an intermittent mode, a dot pattern can be formed on the stored photoreceptor charge.
REFERENCES:
patent: 2831453 (1958-04-01), Hardesty
patent: 3120790 (1964-02-01), Carlson et al.
patent: 3313623 (1967-04-01), Bixby
patent: 3936173 (1976-02-01), Kidd et al.
Moses Richard L.
Xerox Corporation
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