Objective lens

Details Objective lens Objective lens

2007-03-06

2008-11-04

Lester, Evelyn A. (Department: 2873)

Optical: systems and elements

Lens

Microscope objective

C359S656000, C359S686000, C359S739000, C359S740000, C359S808000, C359S811000, C359S822000, C359S823000

Reexamination Certificate

active

07446944

ABSTRACT:
An objective lens comprises a housing, an iris diaphragm and a plurality of lens groups. For focusing the objective lens while minimizing the variation of the image angle at least two lens groups are adapted to be moved relative to the housing. The one lens group is arranged in front of the iris diaphragm. The other lens group is arranged at least partially behind the iris diaphragm.

REFERENCES:
patent: 4249798 (1981-02-01), Moskovich
patent: 4284331 (1981-08-01), Tanaka
patent: 4336983 (1982-06-01), Tanaka et al.
patent: 4726669 (1988-02-01), Angenieux
patent: 5381268 (1995-01-01), Sato
patent: 79 08 085 (1979-08-01), None
Kazuo Tanaka, A Zoom Lens without Focus Breating Phenomena, 2001, pp. 63-67.
Iain A. Neil, High Performance Wide Angle Objective Lens Systems With Internal Close Focusing Optics and Multiple Aspheric Surfaces For The Visible Waveband, pp. 216-241.
Iain A. Neil et al., High Performance, Wide Angle, Marco Focus, Zoom Lens For 35 mm Cinematography, pp. 213-228.

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