Patent ID: 6545714
Filing Date: 2003-04-08
Classification: G02B

Abstract:
An image pickup apparatus wherein an image of an object produced by an optical system is formed on an electronic image pickup device, thereby obtaining image information concerning the object, said optical system having a structure capable of obtaining an aperture number equal to or larger than F4 by reducing a beam diameter, said image pickup apparatus satisfying the following conditions:1.5Ã—{square root over ( )}(2.5/N)<8.0â€ƒâ€ƒ(1) 0.0015<P<0.0055 [millimeter]â€ƒâ€ƒ(2) 2.420 [million]â€ƒâ€ƒ(3) where &phgr; 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 of 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.