Optical: systems and elements – Compound lens system – With curved reflective imaging element
Patent
1990-10-30
1993-03-02
Sugarman, Scott J.
Optical: systems and elements
Compound lens system
With curved reflective imaging element
359399, 359425, 359432, 359435, G02B 2300
Patent
active
051914697
ABSTRACT:
In this system a module carries an afocal variator optical system, and to which module a front partially-obscured reflecting telescopical system and a rear system module can be substantially permanently connected in combination to vary the actual focal length of the front partially-obscured reflecting telescopical system in conjunction with a rear system module without the need to physically change the length dimension of any system, or without the need to change the mirror position or positions of the front module. A partially-obscured reflecting telescopical system is defined as any selected from the group Newtonian, Cassegrain, Ritchey-Chretien, Gregorian and any of their derivatives, including catadioptric derivatives, such as Maksutov and Schmidt types, in which the incoming light is obscured by a central disk with reflecting obverse side, diagonal mirror or pickoff mirror essentially on-axis to the incoming light.
REFERENCES:
patent: 3752559 (1973-08-01), Fletcher et al.
patent: 4318585 (1982-03-01), Matsumura
patent: 4718753 (1988-01-01), Gebelein
patent: 4988173 (1991-01-01), Margolis
patent: 5054896 (1991-10-01), Margolis
Margolis Donald W.
Sugarman Scott J.
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