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Endoscope apparatus with lens for changing the incident angle of light for imaging

  • US 5,704,896 A
  • Filed: 04/19/1995
  • Issued: 01/06/1998
  • Est. Priority Date: 04/27/1994
  • Status: Expired due to Fees
First Claim
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1. An endoscopic apparatus having an endoscope with a head, the head comprising:

  • an optical system having an object lens and a prism, said object lens being coaxial with the endoscope, said prism having an incident surface for receipt of light from said object lens and an emission surface;

    a solid-state image pickup device having microlenses and a photosensitive chip composed of photosensitive elements, said microlenses adapted to condense light onto said photosensitive elements, an imaginary axis normal to said solid-state image pickup device being orthogonal to an axis of the endoscope, said emission surface of said prism being coaxial to said solid-state image pickup device; and

    a plano-convex lens arranged coaxial to said solid-state image pickup device, said plano-convex lens having a flat surface joined to said emission surface of said prism, said plano-convex lens adapted to change a path of light from said optical system to said microlenses depending upon an incident angle of light transmitted by said optical system to said microlenses.

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