Vari-focal polar alignment scope

Details Vari-focal polar alignment scope Vari-focal polar alignment scope

2005-08-16

2005-08-16

Spector, David N. (Department: 2873)

Optical: systems and elements

Compound lens system

Telescope

C359S399000, C359S423000, C359S430000, C359S689000

Reexamination Certificate

active

06930831

ABSTRACT:
A vari-focal polar alignment scope includes an objective optical system, a relay optical system, and an eyepiece optical system, in that order from the object side. The relay optical system includes an erecting vari-focal viewing optical system, including a positive condenser lens element, and positive second and third relay lens groups which relatively move in the optical axis direction so as to vary the magnification of the polar alignment scope, wherein the following conditions (1), (2) and (3) are satisfied:in-line-formulae description="In-line Formulae" end="lead"?6.0<fo/fe<10.0  (1);in-line-formulae description="In-line Formulae" end="tail"?in-line-formulae description="In-line Formulae" end="lead"?−4.0<M2L<−1.0  (2); andin-line-formulae description="In-line Formulae" end="tail"?in-line-formulae description="In-line Formulae" end="lead"?0.2<M3L<0.6  (3); whereinin-line-formulae description="In-line Formulae" end="tail"?fodesignates the focal length of the objective optical system; fe designates the focal length of the eyepiece optical system; M2Ldesignates the lateral magnification of the second lens group of the relay optical system at a low magnification; and M3Ldesignates the lateral magnification of the third lens group of the relay optical system at a low magnification.

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patent: 2004/0136061 (2004-07-01), Denpo et al.
patent: 9-281408 (1997-10-01), None

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