Zoom lens system

A zoom lens system comprising, in order from the object side, a first positive lens unit, a second lens unit which is moved monotonously during zooming mainly for sharing a vari-focal function and has a positive power, a third positive lens unit, and a fourth lens unit which is moved during zooming...

Full description

Saved in:
Bibliographic Details
Main Author TAKADA; KATSUHIRO
Format Patent
LanguageEnglish
Published 09.02.1999
Edition6
Subjects
OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
OPTICS
PHYSICS
Online AccessGet full text

Cover

More Information
Summary:A zoom lens system comprising, in order from the object side, a first positive lens unit, a second lens unit which is moved monotonously during zooming mainly for sharing a vari-focal function and has a positive power, a third positive lens unit, and a fourth lens unit which is moved during zooming forward and backward mainly for correcting a location of an image surface and has a positive power; the third lens unit consisting of a first lens component which comprises at least one positive lens element and a second lens component which comprises at least one negative lens element, whereas the fourth lens unit consisting of a first lens component which comprises at least one negative lens element and a second lens component which comprises at least one positive lens element.
Bibliography:Application Number: US19960672543