Center masking illumination system and method

Details Center masking illumination system and method Center masking illumination system and method

1994-10-25

1997-11-04

Nguyen, Tnong

Optical: systems and elements

Compound lens system

Microscope

359385, 359387, 359834, G02B 2106, G02B 504

Patent

active

056846266

ABSTRACT:
Methods and apparatus for center masking a condenser lens of a transmitted light microscope to simultaneously maximize resolution, contrast and depth of field utilizing at a conjugate plane of the aperture plane where an image of the rear aperture of the condenser lens has been created, a plurality of light sources to illuminate two or more of the faces of a multi-face mirror in the shape of a pyramid which moves relative to the light sources to vary the amount of center masking continuously over a range including zero while directing multiple oblique beams of light onto the objective lens.

REFERENCES:
patent: 3161717 (1964-12-01), Barabas et al.
patent: 4407569 (1983-10-01), Piller et al.
patent: 4585315 (1986-04-01), Sincerbox et al.
patent: 5153621 (1992-10-01), Vogeley
patent: 5305139 (1994-04-01), Greenberg

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