Optical: systems and elements – Optical modulator – Light wave temporal modulation
Patent
1993-11-01
1995-01-10
Lerner, Martin
Optical: systems and elements
Optical modulator
Light wave temporal modulation
353 20, 359 63, 359495, 359497, 359499, G02B 530, G02B 2728, G02F 11335, G03B 2114
Patent
active
053812786
ABSTRACT:
A polarization conversion unit is disclosed. In the unit, a definitely polarized light emitted from a light source is divided into a pair of lights differing in polarized state and are caused to be incident on the optical components including the polarizing beam splitter. The plane of polarization of one of the paired polarized light is rotated to be coincident with the plane of polarization of the other light by the optical components, so that the paired lights with the same plane of polarization are caused to be separately emitted. The optical component has a plano-convex lens which has a positive power and which is arranged at an exit side where the paired lights are separately emitted. The lens has a focal point at a position further than the position of the surface to be illuminated.
REFERENCES:
patent: 3677621 (1972-07-01), Smith
patent: 4560999 (1985-12-01), Tokuhara
patent: 4864390 (1989-09-01), McKechnie et al.
patent: 4989076 (1991-01-01), Owada et al.
patent: 5122895 (1992-06-01), Takanashi et al.
patent: 5124841 (1992-06-01), Oishi
Kimura Kazumi
Mitsutake Hideaki
Shingaki Junko
Canon Kabushiki Kaisha
Lerner Martin
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