Planetary astrographic telescope

Details Planetary astrographic telescope Planetary astrographic telescope

1998-04-04

2000-09-12

Spyrou, Cassandra

Optical: systems and elements

Compound lens system

With curved reflective imaging element

359364, 359365, 359366, 359857, 359858, 359859, G02B 1700

Patent

active

061185795

ABSTRACT:
A planetary astrographic telescope of the Cassegrain type having a concave paraboloidal primary mirror and a convex secondary mirror located in the spherical zone between the primary mirror and said primary mirror's focal point. The spherical secondary mirror receives the light reflected from the primary mirror. The secondary mirror, in turn, reflects such light through an aperture in the primary mirror to a focal plane located behind the primary mirror. The spherical secondary mirror and its holder are in combination sized to be not more than twenty percent of the diameter of the primary mirror and positioned in the spherical zone of light reflected from the paraboloidal primary mirror. One embodiment of the present invention is a tube containing the concave paraboloidal primary mirror and convex spherical secondary mirror with said tube attached to and supported on a mount at a height above a support surface.

REFERENCES:
patent: 3942865 (1976-03-01), Rand
patent: 3968362 (1976-07-01), Mocker
patent: 4061420 (1977-12-01), Kaprelian et al.
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patent: 4571036 (1986-02-01), Gebelein et al.
patent: 4842384 (1989-06-01), Mercado
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patent: 5347401 (1994-09-01), Hugenell
patent: 5471346 (1995-11-01), Ames
patent: 5760979 (1998-06-01), Saito
J. Dragesco, High Resolution Astrophotography, Cambridge University Press (1995) pp.xiii, 17, 20-24.
J.B. Sidgwick, Amateur Astronomer's Handbook, Dover Publications, Inc. (1971) pp. 161-184, 363-367.
J. Texereau, How to Make a Telescope, 2nd Edition William-Bell, Inc. (1984) pp. 139-154.

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