Optical: systems and elements – Compound lens system – Telescope
Patent
1994-10-27
1996-07-30
Nguyen, Thong
Optical: systems and elements
Compound lens system
Telescope
359409, 359412, 359420, 351 41, 351 45, 351158, 351160R, G02B 2300, G02C 100
Patent
active
055417671
ABSTRACT:
A method and apparatus for allowing a user who wears spectacles including at least one lens having a positive magnification factor, to view a distant object through both the lens of the spectacles and a telescope. The method comprises the step of positioning a lens in the optical path of the telescope. The lens placed in the optical path of the telescope is adapted to cancel the positive magnification factor of the lens of the spectacles to maintain the afocal characteristic of telescope. The apparatus comprises at least one afocal telescope defining an optical path having a first lens oriented in the optical path for magnifying a distant object to be viewed through the afocal telescope system. The telescope further comprises a second lens oriented in the optical path for cancelling the positive magnification factor of the lens to maintain the afocal characteristic of the telescope.
REFERENCES:
patent: D296337 (1988-06-01), Caplan
patent: 4834525 (1989-05-01), Vansaghi
patent: 4865438 (1989-09-01), Wada
patent: 4929075 (1990-05-01), Eliakim
patent: 5428474 (1995-06-01), Murphy
Feinbloom Richard E.
Murphy Peter J.
Designs for Vision Inc.
Nguyen Thong
Sikder Mohammad
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