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Objective optical system for endoscopes

  • US 5,198,931 A
  • Filed: 11/14/1991
  • Issued: 03/30/1993
  • Est. Priority Date: 04/19/1989
  • Status: Expired due to Fees
First Claim
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1. An objective optical system for endoscopes comprising:

  • in order from the object side, a first lens component being a negative meniscus lens, an aperture stop, a second lens component being a positive lens component, a third lens component being a positive lens component and a fourth lens component being a positive cemented doublet;

    wherein an object side surface of said first lens component and an image side surface of said third lens component are aspherical surfaces.

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