Optical: systems and elements – Compound lens system – With curved reflective imaging element
Patent
1998-06-03
2000-05-09
Nguyen, Thong
Optical: systems and elements
Compound lens system
With curved reflective imaging element
359364, 359399, 359857, G02B 1700, G02B 508
Patent
active
060611758
ABSTRACT:
The invention is a multi-focal-ratio reflector telescope which uses a primary mirror which can be rotated or flipped and is surfaced on at least two sides. The invention is useful to expand viewing options for astronomy and terrestrial observing. There are two major features of the invention which vary from the current art: A) Primary mirror blank/s are cut, finished and polished on at least two surfaces (or previously finished mirrors are laminated back-to-back or attached to a common structure to achieve this effect) to allow for multi-focal-ratio use; and B) mechanical and/or optical structures are provided to allow adjustment of the effective scope length for resultant primary mirrors which have more than one focal length. Telescopes equipped with the invention reduce the need for using a large variety of viewing accessories such as eyepieces and finder scopes. Magnification accessories such as eyepieces and Barlow lenses can also be increased in utility as a result of this invention. The invention can be embodied in a number of ways as a Newtonian or Cassegrain type telescope.
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Nguyen Thong
Thompson David S.
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