Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1985-02-14
1986-11-18
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
350 371, H01J 314
Patent
active
046237917
ABSTRACT:
An optical scanning device includes a grating disc for deflection which is provided with linear diffraction gratings in an annular arrangement and adapted to deflect a laser beam to optically scan a given plane by means of the deflected laser beam. The laser beam incident to the grating disc has an elliptical section in its incident position on the grating disc. The longer axis of the elliptical section extends in the radial direction of the grating disc.
REFERENCES:
patent: 4505537 (1985-03-01), Funato
Funato Hiroyoshi
Kaneko Yutaka
Nelms David C.
Ricoh & Company, Ltd.
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