Telescope objective system for the infrared range

Details Telescope objective system for the infrared range Telescope objective system for the infrared range

1983-12-29

1985-01-22

Corbin, John K.

350475, 350 11, G02B 1314

Patent

active

044948190

ABSTRACT:
A telescope objective system (10) is formed by a primary lens having a single lens element (A) aligned on a common optical axis (11) with a secondary lens having two lens elements (B,C) the shape and power distribution of lens elements (A,B,C) being such as to compensate for monochromatic aberration of the system, each lens element (A,B,C) being made of a material which has a useful spectral bandpass in the infrared wavelength region and lens elements (B,C) having refractive surfaces (16, 15, 14, 13) intercepting the optical axis (11) which are substantially spherical, the system having a planar image surface (11) and an effective focal length greater than the axial distance between the image surface (11) and the distal refractive surface (18) formed by the primary lens element (A). Primary lens element (A) is positively powered and made of germanium and at least one of the secondary lens elements (B,C) is made of a Chalcogenidae glass such that the system (10) is achromatic in the infrared wavelength region. Conveniently lens element (B) is made of Chalcogenide glass and is negatively powered. Lens element (C) may be negatively powered and made of germanium, or positively powered and made of a Chalcogenide glass.

REFERENCES:
patent: 3363962 (1968-01-01), Vogl
patent: 3778133 (1973-12-01), Tatian
patent: 3817604 (1974-06-01), Watt
patent: 3883214 (1975-03-01), Hoffman
patent: 4190324 (1980-02-01), Arai

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