ZOOM LENS AND IMAGING APPARATUS HAVING THE SAME

PROBLEM TO BE SOLVED: To provide a zoom lens 50 suppressing a flare ghost even if a pair of facing internal walls of a casing are arranged close to an optical axis for high magnification. SOLUTION: The zoom lens includes a lens-barrel 50k; a first lens group LG1 fixed to one end side of the lens-bar...

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Bibliographic Details
Main Authors ENDO TOSHIYA, WADA YUKI, KIMURA KAZUO
Format Patent
LanguageEnglish
Published 23.07.2009
Subjects
OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
OPTICS
PHYSICS
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Summary:PROBLEM TO BE SOLVED: To provide a zoom lens 50 suppressing a flare ghost even if a pair of facing internal walls of a casing are arranged close to an optical axis for high magnification. SOLUTION: The zoom lens includes a lens-barrel 50k; a first lens group LG1 fixed to one end side of the lens-barrel 50k; and a second lens group LG2 for variable power moving on an optical axis CL of the first lens group LG1 away from and close to the first lens group LG1. A first recess 11 and a second recess 12 made in a direction away from the optical axis CL are provided near the first lens group LG1 in the internal walls 50f, 50g of the lens-barrel 50k, in this order from the first lens group LG1 side, and a relationship between the depth t1 of the first recess 11, the depth t2 of the second recess 12 and the thickness t of the internal walls is t1>t>t2. COPYRIGHT: (C)2009,JPO&INPIT
Bibliography:Application Number: JP20080000410