Optical: systems and elements – Polarization without modulation – By relatively adjustable superimposed or in series polarizers
Patent
1994-12-08
1996-01-16
Shafer, Ricky D.
Optical: systems and elements
Polarization without modulation
By relatively adjustable superimposed or in series polarizers
359494, 359629, 353 82, G02B 530, G02B 2728
Patent
active
054853109
ABSTRACT:
A linear polarization/conversion apparatus includes a light source, a polarizing beam splitting means, first and second focusing lenses, and first to fourth total reflection mirrors. The light source includes a reflector having a paraboloid of revolution. The polarizing beam splitting means splits light from the light source into a linearly polarized transmission light component and a linearly polarized reflection light component. The first and second focusing lenses are respectively disposed to oppose exit surfaces, of the polarizing beam splitting means, from which the linearly polarized transmission and reflection light components emerge. The first and second total reflection mirrors are inclined at 45.degree. with respect to the exit surfaces, respectively, so as to totally reflect the linearly polarized transmission and reflection light components from the first and second focusing lenses. The third and fourth total reflection mirrors are respectively inclined at 45.degree. with respect to the reflection optical axes of the first and second total reflection mirrors to totally reflect the light, reflected by the first and second total reflection mirrors, in the same direction.
REFERENCES:
patent: 3508809 (1970-04-01), Wilder et al.
patent: 3677621 (1972-07-01), Smith
patent: 4722593 (1988-02-01), Shimazaki
patent: 4904061 (1990-02-01), Aruga
patent: 4963003 (1990-10-01), Hiiro
patent: 4978202 (1990-12-01), Yang
patent: 5073830 (1991-12-01), Loucks
patent: 5124841 (1992-06-01), Oishi
Nippon Avionics Co. Ltd.
Shafer Ricky D.
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