Optical system with refracting and diffracting optical units, an

Details Optical system with refracting and diffracting optical units, an Optical system with refracting and diffracting optical units, an

1997-10-06

1999-07-27

Spyrou, Cassandra

Optical: systems and elements

Diffraction

From grating

359565, 359742, G02B 308

Patent

active

059300434

ABSTRACT:
A new optical system capable of correcting aberrations well by using a refracting optical element and a diffracting optical element in combination, and of increasing the aperture and the field angle. The optical system includes a first refracting optical unit placed on the object side with respect to a stop, a diffracting optical unit placed adjacent the stop to correct chromatic aberration, and a second refracting optical unit placed on the image side with respect to the stop. The first and second refracting optical units are substantially symmetrical with respect to the stop.

REFERENCES:
patent: 5042927 (1991-08-01), Ogawa et al.
patent: 5241421 (1993-08-01), Endo et al.
patent: 5268790 (1993-12-01), Chen
patent: 5528427 (1996-06-01), Tanaka et al.
patent: 5537259 (1996-07-01), Ogawa
patent: 5568321 (1996-10-01), Ogawa et al.
patent: 5576890 (1996-11-01), Tanaka et al.
patent: 5790321 (1998-08-01), Goto

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