Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1985-02-05
1986-07-08
Henry, Jon W.
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
350276R, 354479, 358222, G02B 1706, G03B 1104
Patent
active
045989818
ABSTRACT:
An unobscured three mirror wide-angle telescopic imaging system comprised of an input baffle which provides a 20.degree. (Y axis).times.30.degree. (X axis) field of view, a primary mirror having a convex spherical surface, a secondary mirror having a concave ellipsoidal reflecting surface, a tertiary mirror having a concave spherical reflecting surface. The mirrors comprise mirror elements which are offset segments of parent mirrors whose axes and vertices commonly lie on the system's optical axis. An iris diaphragm forming an aperture stop is located between the secondary and tertiary mirror with its center also being coincident with the optical axis and being further located at the beam waist of input light beams reflected from the primary and secondary mirror surfaces. At the system focus following the tertiary mirror is located a flat detector which may be, for example, a TV imaging tube or a photographic film. When desirable, a spectral transmission filter is placed in front of the detector in close proximity thereto.
REFERENCES:
patent: 3432219 (1969-03-01), Shenker et al.
patent: 3811749 (1974-05-01), Abel
patent: 3907401 (1975-09-01), Liu
patent: 3963328 (1976-06-01), Abel
patent: 4101195 (1978-07-01), Korsch
patent: 4265510 (1981-05-01), Cook
Dietrich Korsch, "Design . . . Three-Mirror Telescopes", App. Opt., vol. 19, No. 21, pp. 3640-3640, Nov. 1980.
Rubin Gelles, "Unobscured . . . Telescopes", Opt. Eng., vol. 13, Nov.-Dec. 1974, pp. 534-538.
W. B. King, "Unobscured . . . Mirrors", App. Opt., vol. 13, pp. 21-22, Jan. 1974.
Hallam Kenneth L.
Howell Barton J.
Wilson Mark E.
Henry Jon W.
Manning John R.
The United States of America as represented by the Administrator
Tresansky John O.
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