Zoom optical system

Details Zoom optical system Zoom optical system

1998-01-27

2000-01-11

Dang, Hung Xuan

Optical: systems and elements

Lens

With variable magnification

359676, G02B 1514

Patent

active

060142650

ABSTRACT:
An optical system composed, in order from the object side, of a first lens unit which has a positive power or is powerless, a second lens unit which has a positive power, a third lens unit which has a positive power and a fourth lens unit which has a negative power, and configured to change its magnification by varying airspaces reserved between the lens unit. The fourth lens unit is composed of a single lens element or the optical system as a whole is composed of lens element in a number not exceeding twice a number of movable lens units. The optical system is composed of a small number of lens elements and compact.

REFERENCES:
patent: 5587840 (1996-12-01), Itoh
patent: 5805359 (1998-09-01), Yamanashi

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