Optical imaging system

Details Optical imaging system Optical imaging system

1994-11-15

1996-07-30

Dzierzynski, Paul M.

Optical: systems and elements

Absorption filter

359887, 359888, 359723, 359558, H04N 931, G02B 518, G02B 520, G02B 508

Patent

active

055417795

ABSTRACT:
An optical imaging system having a simple optical shading filter for reducing various aberrations is disclosed. The optical imaging system includes one or more lenses, a stop installed between the lenses, and an optical shading filter for reducing the extra axial aberrations. The optical shading filter is an gradual optical shading filter having a transmittance which deceases cuing toward the peripheral portions. The optical imaging system is simple in its structure, and is effective in its function. Further, the manufacturing is easy, and the manufacturing cost is low.

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patent: 4030817 (1977-06-01), Westell
patent: 4035062 (1977-07-01), Fletcher et al.
patent: 4454535 (1984-06-01), Machida
patent: 4906081 (1990-03-01), Yashuda
patent: 5013133 (1991-05-01), Buralli et al.
Xerox Disclosure Journal, Kenneth Altfalher and Jamer Law. vol. 4, No. 4, Jul./Aug. 1979.

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