Afocal zoom lens for microscopes

Details Afocal zoom lens for microscopes Afocal zoom lens for microscopes

2006-07-04

2006-07-04

Dang, Hung Xuan (Department: 2873)

Optical: systems and elements

Lens

Microscope objective

C359S763000, C359S764000

Reexamination Certificate

active

07072119

ABSTRACT:
An afocal zoom lens for microscopes includes five lens units having, in order from the object side, positive, negative, negative, positive, and negative refracting powers. When the magnification of the afocal zoom lens is changed in the range from a low-magnification position to a high-magnification position, a first lens unit and a fifth lens unit are fixed, a second lens unit is moved toward the image side, and a fourth lens unit is moved toward the object side. The afocal zoom lens satisfies the following condition:in-line-formulae description="In-line Formulae" end="lead"?0≦F2/F3≦2.5in-line-formulae description="In-line Formulae" end="tail"?where the focal length of the second lens unit is represented by F2and the focal length of a third lens unit is represented by F3. The third lens unit is constructed with at least one negative lens with a concave surface facing the object side.

REFERENCES:
patent: 5050972 (1991-09-01), Mukaiya et al.
patent: 59-038651 (1985-09-01), None
patent: 09-273317 (1999-04-01), None
patent: 11-333154 (2001-06-01), None

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