Re-imaging converter lens apparatus and method

Details Re-imaging converter lens apparatus and method Re-imaging converter lens apparatus and method

1995-08-24

1997-12-30

Nguyen, Thong

Optical: systems and elements

Compound lens system

Telescope

359423, 359434, G02B 2300, G02B 934

Patent

active

057037167

ABSTRACT:
Apparatus and methods are disclosed for re-imaging a primary image produced by a prime lens to form a positively demagnified secondary image at a secondary image plane, wherein the secondary image is smaller than, but has the same field angle as, the primary image. The apparatus comprises a field lens group and an optical relay. The optical relay can comprise a first lens group having negative refractive power, a second lens group having positive refracting power, and an erecting lens group interposed coaxially between the first and second lens groups. The apparatus also can comprise a beam-splitter imagewise to the optical relay to form multiple secondary images. The apparatus and methods have especial utility for adapting prime lens, designed for use on older, larger TV cameras, for use on newer, smaller TV cameras without sacrificing field angle.

REFERENCES:
patent: 4591901 (1986-05-01), Andrevski
patent: 4867549 (1989-09-01), Sekine
patent: 5132838 (1992-07-01), Ohshita
patent: 5563736 (1996-10-01), Lewis
patent: 5585965 (1996-12-01), Hayashi et al.

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