Is a
Patent attributes
Patent Jurisdiction
Patent Number
Date of Patent
July 12, 2011
Patent Application Number
12527931
Date Filed
February 26, 2008
Patent Primary Examiner
Patent abstract
An objective optical system includes, in order from the object side, a first unit having two lenses with negative refracting power and positive refracting power, a stop, and a second unit with positive refracting power to satisfy the following condition:3.0<fb/fL where fb is the back focus of the objective optical system in air and fL is the focal length of the entire objective optical system.
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