Is a
Patent attributes
Current Assignee
Patent Jurisdiction
Patent Number
Patent Inventor Names
Tsutomu Uzawa0
Ken Kasai0
Takayuki Kato0
Date of Patent
August 1, 2006
0Patent Application Number
105131200
Date Filed
May 14, 2004
0Patent Citations Received
Patent Primary Examiner
Patent abstract
An objective lens includes, in order from the object side, a first lens (L1) with negative power, a second lens (L2) with positive power, an aperture stop (AS), and a third lens (L3) with positive power. A lens component located on the image side of the aperture stop (AS) is constructed with a positive single lens or a plurality of positive single lenses, and the objective lens satisfies the following conditions:45<vd1−vd2−0.6<f1/f2<−0.3where vd1 is the Abbe's number of the first lens, vd2 is the Abbe's number of the second lens, f1 is the focal length of the first lens, and f2 is the focal length of the second lens.
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