Illumination optical system

Details Illumination optical system Illumination optical system

1994-10-04

1996-07-09

Shafer, Ricky D.

Optical: systems and elements

Polarization without modulation

Polarizarion by dichroism

359495, 359497, 362 19, 362296, G02B 530, G02B 2728

Patent

active

055350542

ABSTRACT:
An illumination optical system for supplying polarized illumination light to an object to be illuminated. The light from a light source is separated by a polarizing beam splitter into a first polarized light component as the illumination light and a second polarized light component which is different in polarizing direction from the first polarized light component. A first reflecting optical member for returning the second polarized light component to the light source side and a converging optical system are arranged in such a manner that a light source image due to the backward light from the first reflecting optical member is formed at a position apart from the light source in a direction substantially perpendicular to the optical axis of the converging optical system. The backward light is converted by a polarizing element to a polarized light of the same polarizing direction as the first polarized light component and it is again emitted from the polarizing beam splitter at an optical axis position adjacent to the first polarized light component.

REFERENCES:
patent: 3443858 (1969-05-01), Russa
patent: 3635552 (1972-01-01), de Lang
patent: 3682532 (1972-08-01), Myles
patent: 3704061 (1972-11-01), Travis
patent: 4007979 (1977-02-01), Coblitz
patent: 4963003 (1990-10-01), Hiiro
patent: 5048030 (1991-09-01), Hiiro
patent: 5155623 (1992-10-01), Miller et al.

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