Illumination optical system

Details Illumination optical system Illumination optical system

1997-04-07

1999-03-09

Henry, Jon

Optical: systems and elements

Holographic system or element

Using a hologram as an optical element

359385, 359599, G02B 502, G02B 2112, G02B 532

Patent

active

058808612

ABSTRACT:
An illumination optical system to be disposed between a light source and a specimen comprises, in order from a light source side, a collector lens, a diffusing plate having a diffusing surface, a light source image projecting lens, and a condenser lens. A field stop is arranged between the diffusing plate and the light source image projecting lens, and an aperture stop is arranged between the light source image projecting lens and the condenser lens. The illumination optical system can attain an ideal numerical aperture and provide uniform and bright illumination light over a predetermined area upon diffusion characteristics on the diffusing surface being adjusted.

REFERENCES:
patent: 3708217 (1973-01-01), McMahon
patent: 5046793 (1991-09-01), Hockley et al.
patent: 5418631 (1995-05-01), Tedesco
patent: 5671084 (1997-09-01), Kurtz
Wadle et al., Abstract. Holographic diffusers, Optical Engineering/Jan. 1994/vol. 33 No. 1/213.
"Methods for Providing Uniform Diffuse Illumination," IBM Tech. Dis. Bull., vol. 27, No. 11, pp. 6683-6685, Apr., 1985.

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