Keplerian finder optical system

Details Keplerian finder optical system Keplerian finder optical system

1989-03-06

1991-10-29

Arnold, Bruce Y.

Optical: systems and elements

Compound lens system

Telescope

359740, 359432, 359834, 359376, G02B 2300, G02B 908, G02B 504

Patent

active

050610546

ABSTRACT:
A Keplerian finder optical system composed of, in succession from the object side, an objective lens of a positive refractive power, a field lens of a positive refractive power positioned in the vicinity of the focal plane of the objective lens, and an eyepiece lens for observing an image of the object formed on the focal plane of the objective lens, comprises a field diaphragm positioned in the vicinity of the focal plane of the objective lens, a first reflecting device with two reflecting faces positioned in the optical path between the objective lens and the field diaphragm, and second reflecting device with two other reflecting faces, positioned between the field diaphragm and the eyepiece lens.

REFERENCES:
patent: 3468598 (1969-09-01), Ito
patent: 3558212 (1971-01-01), Ritchie
patent: 3751136 (1973-08-01), Kirchhoff
patent: 3788727 (1974-01-01), Abe
patent: 4009930 (1977-03-01), Abe et al.
patent: 4119982 (1978-10-01), Imura et al.
patent: 4309093 (1982-01-01), Kuwayama et al.
patent: 4643541 (1987-02-01), Matsubara
patent: 4673262 (1987-06-01), Tsui
patent: 4726667 (1988-02-01), Tachihara
patent: 4826302 (1989-05-01), Afsenius
patent: 4838672 (1989-06-01), Oonishi
patent: 4842395 (1989-06-01), Sato et al.
Fincham et al., Optics, Ninth Edition, University Press, Cambridge, 1980, Chapter 3, Section 3.9, pp. 31-32.

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