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Title:
ZOOM LENS SYSTEM AND FOCUSING METHOD THEREFOR
Document Type and Number:
Japanese Patent JP2002006219
Kind Code:
A
Abstract:

To obtain a small-sized zoom lens system which is a telephoto type three-group zoom lens system, and capable of satisfactorily correcting aberration, even though the zoom lens system is constituted of a small number of lenses.

As for the zoom lens system which is constituted of a 1st positive lens group, a 2nd positive lens group and a 3rd negative lens group in order from an object side, and which is prepared for zooming by independently moving the three lens groups, that is, the 1st lens group to the 3rd lens group, in an optical axis direction, a focusing operation is performed by integrally moving the 1st lens group and the 2nd lens group, although the 1st and 2nd lens groups are separately moved at focusing.


Inventors:
ENOMOTO TAKASHI
Application Number:
JP2000189884A
Publication Date:
January 09, 2002
Filing Date:
June 23, 2000
Export Citation:
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Assignee:
ASAHI OPTICAL CO LTD
International Classes:
G02B15/20; G02B13/18; G02B15/16; (IPC1-7): G02B15/20; G02B13/18
Domestic Patent References:
JPH07120678A1995-05-12
JPH06230284A1994-08-19
JPH06294932A1994-10-21
JPH08179215A1996-07-12
JPH0210307A1990-01-16
JPH0234812A1990-02-05
Attorney, Agent or Firm:
Kunio Miura