Transmission type illumination device for stereomicroscopes,...

Details Transmission type illumination device for stereomicroscopes,... Transmission type illumination device for stereomicroscopes,...

2006-11-07

2006-11-07

Amari, Alessandro (Department: 2872)

Optical: systems and elements

Compound lens system

Microscope

Reexamination Certificate

active

07133199

ABSTRACT:
The invention has for its object to provide a transmission type illumination device for a stereomicroscope capable of observing objects over a wide magnification range wherein a diffuser that provides a surface light source and an optical element having a periodical structure in a one-dimensional direction are used in combination thereby achieving illumination with reduced field variations. This device is at least made up of, in order from a light source, a collector lens, a diffuser and a convex lens4b. In the vicinity of the lens4blocated nearest to the side of a viewing surface5, there is provided an optical element having a periodical structure in a one-dimensional direction. With respect to the angle α for splitting the incident light beam, the optical element7having a periodical structure in a one-dimensional direction satisfies the condition 0.5D/L<tanα<0.9D/L where D is the effective diameter of the secondary light source, and L is the distance from the optical element having a periodical structure in a one-dimensional direction to the secondary light source.

REFERENCES:
patent: 6252717 (2001-06-01), Grosskopf
patent: 6396628 (2002-05-01), Osa et al.
patent: 6636363 (2003-10-01), Kaminsky et al.

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