Modular afocal variator optical focusing system

Details Modular afocal variator optical focusing system Modular afocal variator optical focusing system

1988-12-19

1991-01-29

Arnold, Bruce Y.

350422, G02B 1502, G02B 1515

Patent

active

049881736

ABSTRACT:
A modular optical system is provided in which a central element which carries an afocal variator optical system is provided, and to which central element both a front optical system and a rear optical system can be substantially permanently connected in optical series in combination. The modular optical system has the ability to vary the actual focal length of the front optical system in conjunction with the rear optical system without the need to physically change the length dimension or the lens position or the lenses of the front optical system. The afocal variator optical system includes in optical series a first positive lens, a negative lens, and a second positive lens. Within the afocal variator optical system the negative lens is so positioned and so controlled that it is capable of being moved continuously either towards and away from the first positive lens and towards and away from the second positive lens, all while the distance between the first positive lens and the second positive lens of the afocal variator optical system remains substantially constant. The afocal variator optical system is located and supported by a system which includes front and rear end connecting means for substantially permanently connecting it with the front optical system and rear optical system, respectively. Means are also provided in conjunction with the front optical system and the rear optical system to allow their susbstantially permanent connection to the afocal variator support system.

REFERENCES:
patent: 4426135 (1984-01-01), Hashiya

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