Method and apparatus for high energy propagation back focus cont

Details Method and apparatus for high energy propagation back focus cont Method and apparatus for high energy propagation back focus cont

1998-03-23

2000-07-04

Epps, Georgia

Optical: systems and elements

Lens

359718, G02B 300, G02B 302

Patent

active

060847182

ABSTRACT:
A method and apparatus for adjusting the location of the back focus of a lens while maintaining the primary focal point location thus eliminating the need to position external components around the back focus location. Instead, the back focus can be positioned around the external components. The shape of the first and second surfaces of the lens are altered to adjust the back focus to a desired location while maintaining the location of the primary focus.

REFERENCES:
patent: 3817604 (1974-06-01), Watt
patent: 4156209 (1979-05-01), Herbst
patent: 4525042 (1985-06-01), Muchel
patent: 5796523 (1998-08-01), Hall
patent: 5864128 (1999-01-01), Plesko

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