Patent
1988-07-18
1989-11-07
Sugarman, Scott J.
350432, 350477, 350478, 350480, G02B 934, G02B 1318, G02B 906, G02B 912
Patent
active
048787450
ABSTRACT:
Disclosed is a novel optical system for illuminating an object which provides an increased irradiance in the peripheral area of the object. The optical system includes a light source, an entrance pupil for receiving light from the light source, an exit pupil for passing the light received to the object, and an optical axis which extends through the optical system to the light source and the object, respectively, wherein the relationship among the incident height h to the entrance pupil, an illumination height H on the object, and a changing rate (dh/dH) of the incident height and the illumination height is defined by a function, f(H)=(h/H)(dh/dH). The optical system is designed so as to satisfy the following formula in the peripheral area of the object: f(0)<f(H). The function f(0) is represented by f(0)=[fa'/(a'-f)b'}].sup.2, where a' is a distance between the light source and the primary principal point of the optical system, and b' is a distance between the real image of the light source and the object.
REFERENCES:
patent: 4389100 (1983-06-01), Sugiyama et al.
patent: 4645311 (1987-02-01), Rothe
patent: 4730905 (1988-03-01), Takada
Endo Kenji
Nagata Shin-ichi
Uemura Haruo
Dainippon Screen Mfg. Co,. Ltd.
Sugarman Scott J.
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