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DUAL FOCAL LENGTH LENS SYSTEM

  • US 20090135502A1
  • Filed: 11/27/2007
  • Published: 05/28/2009
  • Est. Priority Date: 11/27/2007
  • Status: Active Grant
First Claim
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1. A dual focal length optical system comprising:

  • a first optical system positioned along an optical axis, the first optical system including an optical structure having an object side surface and an image side surface, the object side surface and the image side surface including a refractive surface portion and a reflective surface portion, the first optical system having a focal length; and

    a second optical system positioned on the same optical axis, the second optical system having a focal length, the focal length of the first optical system being longer than the focal length of the second optical system.

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