Is a
Patent attributes
Current Assignee
Patent Jurisdiction
Patent Number
Date of Patent
February 2, 2010
Patent Application Number
11547686
Date Filed
March 24, 2005
Patent Primary Examiner
Patent abstract
An objective lens for at least one of recording and reproducing for an optical information recording medium includes in the order from a light source side: a first lens group having negative refracting power, which is in a meniscus shape having a concave surface facing the light source side; a second lens group having positive refracting power; and a third lens group having positive refracting power, which is in a meniscus shape having a concave surface facing an image side.
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