Reflection type optical apparatus

Details Reflection type optical apparatus Reflection type optical apparatus

1989-04-05

1991-08-13

Arnold, Bruce Y.

Optical: systems and elements

Compound lens system

Microscope

359389, 359888, G02B 2106, G02B 522

Patent

active

050392140

ABSTRACT:
A beam splitter, a first polarizing plate and a quarterwave plate are provided in that order on the optical axis of an image formation lens between an image formation plane and an objective lens. The first polarizing plate comprises a non-polarizing region for transmitting illuminating light and reflected light and a polarizing region provided to enclose the non-polarizing region for transmitting the illuminating light but limiting the reflected light which is rendered out of phase with the illuminating light by the quarterwave plate. Thus, the angular aperture of the illuminating light can be increased and an irradiated plane can be observed with no hindrance even if the same is inferior in flatness, while illuminance of the irradiated plane can be sufficiently ensured. At the same time, the angular aperture of the objective lens can be reduced, and the depth of focus Q is increased.

REFERENCES:
patent: 2944463 (1960-07-01), Rantsch
patent: 3853398 (1974-12-01), Kano
patent: 3926500 (1975-12-01), Frosch et al.
patent: 4062623 (1977-12-01), Suzuki et al.
patent: 4599000 (1986-07-01), Yamada
patent: 4634240 (1987-01-01), Suzuki et al.
patent: 4694186 (1987-09-01), Onoda et al.
patent: 4814829 (1989-03-01), Kosugi et al.

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