Holographic member for a real-time clock in a raster output scan

Details Holographic member for a real-time clock in a raster output scan Holographic member for a real-time clock in a raster output scan

1992-11-02

1994-03-01

Lerner, Martin

Optical: systems and elements

Holographic system or element

Using a hologram as an optical element

235457, 359205, 359572, 359575, G02B 518, G02B 2610, G02B 2744

Patent

active

052913180

ABSTRACT:
A grating having holographic properties is employed in a pixel clock for a raster-output scanner. A pilot beam, off-axis from the writing beam creating a latent image on the photoreceptor, is focused on the grating. The grating is adapted to direct a portion of the pilot beam to a photodetector in a fixed point location. The holographic properties of the grating ensure that a wave associated with a reflected interference pattern is always directed at the photodetector throughout the scan path of the pilot beam.

REFERENCES:
patent: 4003636 (1977-01-01), Goshima et al.
patent: 4106844 (1978-08-01), Bryngdahl et al.
patent: 4178064 (1979-12-01), Mrdjen
patent: 4585297 (1986-04-01), Hamaguchi et al.
patent: 4728789 (1988-03-01), Broockman et al.
patent: 4758058 (1988-07-01), Cato et al.

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