Projecting optical system

Details Projecting optical system Projecting optical system

1997-10-31

1999-10-19

Epps, Georgia

Optical: systems and elements

Lens

With field curvature shaping

G02B 300

Patent

active

059698756

ABSTRACT:
A projecting optical system includes, in order from the side of a screen, a first lens unit of positive refractive power of retrofocus type and a second lens unit composed of one positive lens, wherein parameters of the projecting optical system are determined such that an off-axial principal ray crosses an optical axis between the first lens unit and the second lens unit, and the following condition is satisfied:

REFERENCES:
patent: 5257134 (1993-10-01), Sugawara
patent: 5303088 (1994-04-01), Sugawara
patent: 5550679 (1996-08-01), Sugawara
patent: 5552938 (1996-09-01), Sugawara
patent: 5600490 (1997-02-01), Sugawara et al.

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