Variable magnification optical system

Details Variable magnification optical system Variable magnification optical system

1997-11-25

2000-02-22

Epps, Georgia

Optical: systems and elements

Lens

With variable magnification

359683, G02B 1514

Patent

active

060287152

ABSTRACT:
A variable magnification optical system for projecting images from a small-sized, high-resolution display device consists of, from the projection side, a first lens unit having a positive optical power, a second lens unit having a negative optical power, a third lens unit having a negative optical power, and a fourth lens unit having a positive optical power and kept in a fixed position during magnification adjustment. The optical system achieves magnification adjustment by moving at least the second and third lens units along the optical axis, and has at least one negative lens element in the second lens unit, at least one negative lens element in the third lens unit, and at least one positive lens element in the fourth lens unit made of lens materials having predetermined anomalous dispersions and predetermined Abbe numbers.

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