Optical system of the Petzval type

Details Optical system of the Petzval type Optical system of the Petzval type

1988-01-11

1989-06-27

Corbin, John K.

G02B 300

Patent

active

048423840

ABSTRACT:
A catadioptric optical imaging system comprises a dioptric assembly (20) and a catoptric asembly (21), which are positioned with respect to each other to form an imaging system of long focal length. The dioptric assembly (20) comprises two confocal paraboloidal mirrors (22, 23) arranged to form a telescope of the Mersenne type. The catoptric assembly (21) comprises lens elements arranged in two groups, viz., a field group (25) and a relay group (26), which are coaxially disposed with respect to the dioptric assembly (20). Only two different optical materials, viz., calcium fluoride crystal and Hoya LAC7 glass, are used in making the lens elements of the dioptric assembly (20). The dioptric assembly (20) is color-corrected at five wavelengths and has only negligible secondary and higher-order spectra in a wavelength band extending from the ultraviolet region to the near infrared region of the optical spectrum.

REFERENCES:
patent: 4702569 (1987-10-01), Merrada et al.

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