Optical system

Details Optical system Optical system

2006-06-06

2006-06-06

Thompson, Timothy (Department: 2873)

Optical: systems and elements

Lens

Multiple component lenses

C359S691000, C359S680000

Reexamination Certificate

active

07057831

ABSTRACT:
An optical system of a telephoto type is disclosed, in which a refractive optical element made of a solid material that satisfiesνd<30, θgd<−3.333×10−3·νd+1.40 and θgF<−2.615×10−3·νd+0.67 is installed, νd representing an Abbe's number, and θgd and θgF representing partial dispersion ratios. A refractive power with adequate sign is given to the refractive optical element in accordance with its location. Thereby, an optical system, which can excellently correct various aberrations such as chromatic aberration, and can be manufactured easily, and has an excellent environment resistance, is realized.

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European Patent Office; “European Search Report”; of corresponding European Patent Application No. EP 05 25 0449; date of mailing Jun. 1, 2005; (4 pages).

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