×

Image pickup apparatus having a beam limiting member

  • US 7,170,559 B2
  • Filed: 02/05/2003
  • Issued: 01/30/2007
  • Est. Priority Date: 02/25/1999
  • Status: Expired due to Term
First Claim
Patent Images

1. An image pickup apparatus comprising:

  • an optical system for forming an image of an object;

    an image pickup device;

    a beam limiting member having a light-transmitting portion and a light blocking portion, said beam limiting member being positioned between said object and said image pickup device to limit a beam diameter, thereby generating a light beam having an aperture number not less than F4 at all times;

    said image pickup apparatus satisfying the following conditions;

    (1) 1.5<

    φ

    /P×



    {square root over ( )}(2.5/N)<

    8.0(2) 0.0015<

    P<

    0.0055 [millimeter](3) 2.4<

    N<

    20 [million]where Ø

    is a size (given in millimeters) of a diameter of 90% encircled energy of a point spread function by amplitude of the optical system approximately at a center of an image plane, exclusive of low-pass action by an optical low-pass filter, for a wavelength of e-line at an aperture number F5.6;

    N is the number of pixels (given in million) of the image pickup device; and

    P is a pixel pitch (given in millimeters) of the image pickup device.

View all claims
  • 3 Assignments
Timeline View
Assignment View
    ×
    ×