Intensity control for the imaging beam of a raster scanner

Details Intensity control for the imaging beam of a raster scanner Intensity control for the imaging beam of a raster scanner

1984-09-04

1985-12-17

Tarcza, Thomas H.

Recorders

Printing, dotting, or punching marker

Ink transfer support or moving means

346108, 350371, G01D 1514

Patent

active

045595461

ABSTRACT:
A raster output scanner in which a twisted nematic liquid crystal is disposed in the path of the linearly polarized scanning beam incident on the scanner modulator to provide controlled rotation of the plane of polarization of the beam to maximize modulator diffraction efficiency and beam intensity, control over the crystal external electric field being either exercised manually or automatically, the latter through a feedback loop using a photodetector to monitor changes in beam intensity at the scanner photoreceptor. In an alternate embodiment, the liquid crystal is replaced by a magneto-optic cell.

REFERENCES:
patent: 3943369 (1976-03-01), Saeva
patent: 4246549 (1981-01-01), Carter et al.
patent: 4367925 (1983-01-01), Sprague et al.
patent: 4423927 (1984-01-01), Bly
patent: 4449153 (1984-05-01), Tschang
Zilberstein, A Proposal for a Magnetically Controlled Light-Beam Modulator and Shutter, IEEE Proc., vol. 52, No. 12, Dec. 1964, pp. 1751-1752.
De Benedictis et al., Optical Polarization Sensitivity of Lead Molybate, American Physics Letters, vol. 25, No. 1, Jul. 1, 1974, pp. 62-64.
"The Physics and Display Applications of Liquid Crystals", I. A. Shanks, Contemp. Phys. 1982, vol. 23, No. 1, 65-91.
"Voltage Dependent Optical Activity of a Twisted Nematic Liquid Crystal", M. Schadt & W. Helfrich, Applied Physics Letters, vol. 18, No. 4, 2/15/71, pp. 127-128.
"Faraday Rotation in Praseodymium, Terbium, and Dysprosium Alumina Silicate Glasses", C. G. Robinson & R. E. Graf, Applied Optics, vol. 3, No. 10, Oct. 1964, pp. 1190-1191.

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