Light beam scanning device with curved grid pattern

Details Light beam scanning device with curved grid pattern Light beam scanning device with curved grid pattern

1981-05-01

1984-01-31

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

350 69, 250237G, H01J 314

Patent

active

044292201

ABSTRACT:
A light beam scanning device in which scanning speed irregularities of a light spot in a scanning plane are corrected using a signal which is generated in response to light passing through a grid pattern. First and second light beams are directed onto a scanning mirror, which may be an oscillating mirror or a rotary multi-surface mirror. The deflected first light beam is scanned on a recording surface while the deflected second light beam is directed through a grid pattern. An optical detector produces an output signal in response to light passing through the grid pattern which is used to control the movement of the beam deflecting device. Preferably, the grid pattern is curved to lie along a circle having the deflection point of the second light beam on the surface of the mirror as its center.

REFERENCES:
patent: 3658428 (1972-04-01), Voigtlaender-Tetzner
patent: 4178064 (1979-12-01), Mrdjen
patent: 4329011 (1982-05-01), Mori et al.

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