Objective optical system for endoscopes

Details Objective optical system for endoscopes Objective optical system for endoscopes

2011-07-12

2011-07-12

Thompson, Timothy J (Department: 2873)

Optical: systems and elements

Lens

Multiple component lenses

C359S794000, C359S795000

Reexamination Certificate

active

07978423

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:in-line-formulae description="In-line Formulae" end="lead"?3.0<fb/fLin-line-formulae description="In-line Formulae" end="tail"?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.

REFERENCES:
patent: 2007/0091456 (2007-04-01), Yamamoto
patent: 10-260347 (1998-09-01), None
patent: 10-260348 (1998-09-01), None
patent: 2000-039553 (2000-02-01), None
patent: 2000-047101 (2000-02-01), None
patent: 2000-089105 (2000-03-01), None
patent: 2003-222793 (2003-08-01), None
patent: 2005-148508 (2005-06-01), None
patent: 2006-521584 (2006-09-01), None
International Search report dated Jun. 3, 2008 for PCT/JP2008/053239.

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