Variable magnification optical system

Details Variable magnification optical system Variable magnification optical system

1998-10-09

2000-01-11

Epps, Georgia

Optical: systems and elements

Lens

With variable magnification

359683, G02B 1514

Patent

active

060142677

ABSTRACT:
A variable magnification optical system includes, from the projection side, a negative first lens unit, a positive second lens unit and a positive third lens unit. The magnification is varied by moving the first and second lens units along the optical axis. A lens element in the first lens unit and a lens element in the third lens unit are aspherical lens elements of which aspherical deviation is defined. A positive lens element in the third lens unit is made of a material of which anomalous partial dispersibility and Abbe number are defined.

REFERENCES:
patent: 5646777 (1997-07-01), Ohshita
patent: 5872660 (1999-02-01), Kohno et al.
patent: 5889620 (1999-03-01), Furuta
patent: 5909318 (1999-06-01), Tanaka

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