Is a
Patent attributes
Current Assignee
Patent Jurisdiction
Patent Number
Patent Inventor Names
Daisuke Koreeda0
Koichi Maruyama0
Naohito Sasaki0
Shuichi Takeuchi0
Date of Patent
October 9, 2007
0Patent Application Number
109372900
Date Filed
September 10, 2004
0Patent Primary Examiner
Patent abstract
An objective lens on which a beam having parallel light fluxes is incident includes a single element lens and a reflection suppressing coating formed on at least one surface of the single element lens. The reflection suppressing coating is formed such that the reflectivity across a radius of the objective lens exhibits a local maximal value, and the reflection suppressing coating is formed to achieve the following condition:0.6<h1/hmax<0.95,wherein h1 denotes a distance between an optical axis and a position at which the reflectivity exhibits the local maximal value, and hmax denotes a distance between the optical axis and an outermost position of the effective diameter of the objective lens.
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