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Optical device for making light converge

  • US 6,791,755 B2
  • Filed: 08/06/2002
  • Issued: 09/14/2004
  • Est. Priority Date: 08/08/2001
  • Status: Expired due to Fees
First Claim
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1. An optical device for making light shone into the optical device converge, comprising:

  • a plurality of diffracting portions each making light passing therethrough converge by diffraction, wherein optical axes of the plurality of diffracting portions coincide with one another, the light shone into the optical device is passed through one after another of the plurality of diffracting portions so that the light is made to converge to a higher degree every time the light passes through one of the diffracting portions, and at least one of the diffracting portions makes light converge by reflecting the light.

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