Polarization converting device and polarized-light illuminating

Details Polarization converting device and polarized-light illuminating Polarization converting device and polarized-light illuminating

1992-12-09

1995-02-07

Sikes, William L.

Optical: systems and elements

Holographic system or element

Using a hologram as an optical element

359 40, 359 49, 359 70, 359 73, 359487, 359496, 359499, G02F 1137, G02F 11335

Patent

active

053879910

ABSTRACT:
A polarization converting device for converting a light from a light source into a polarized light comprises a first prism having a first slant plane for receiving the light from the light source and dividing it into first and second lights with their polarized planes orthogonal, a first emergent surface from which the first light exits, and a second emergent surface from which the second light exits, a second prism having an incident surface opposed to the second emergent surface of the first prism, a second slant plane for reflecting and deflecting the second light from the incident surface so as to direct it to an optical path almost parallel to that of the first light, and a third emergent surface from which the second light reflected from the second slant plane exits, and a transparent layer carried between the second emergent surface of the first prism and the incident surface of the second prism, the transparent layer having a smaller refractive index than the first prism.

REFERENCES:
patent: 4516837 (1985-05-01), Soref et al.
patent: 4824214 (1989-04-01), Ledebuhr
patent: 4913529 (1990-04-01), Goldenberg et al.
patent: 4989076 (1991-01-01), Owada et al.
patent: 5042921 (1991-08-01), Sato et al.
Patent Abstract of Japan, vol. 9, No. 199 (P-380) [1922] Aug. 16, 1985.

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