Optical: systems and elements – Polarization without modulation – By relatively adjustable superimposed or in series polarizers
Patent
1994-12-12
1996-04-02
Shafer, Ricky D.
Optical: systems and elements
Polarization without modulation
By relatively adjustable superimposed or in series polarizers
359497, G02B 530, G02B 2728
Patent
active
055046193
ABSTRACT:
The present invention allows image recording with plural light beams while eliminating alignment changes of light spots on the inner face of a drum. A light beam output unit 212 combines two circularly polarized light beams having opposite handedness to each other to produce a composite light beam CB. A polarization beam splitter 203 and mirrors 205 and 207 change the course of the light beam towards the inner face of a drum 120. A quarter-wave plate 202 and the polarization beam splitter 203 splits the composite light beam to two separate light beams as a function of the handedness of the circularly polarized light. The optical elements 202, 203, 205, and 207 are integrally rotated around the axis of the drum 120 by a main scanning motor 230, thus scanning a photosensitive material 110 held on the inner face of the drum 120 with the light beams.
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Optics and Laser Technology vol. 18, No. 4, Aug. 1986, Guilford, Surrey, Great Britain; pp. 213-215; D. W. Swift "Rotation Prisms in Series" p. 214, Col. 1, line 30--Column 2, line 31; FIG. 2.
Dainippon Screen Mfg. Co,. Ltd.
Shafer Ricky D.
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