Image forming lens system

Details Image forming lens system Image forming lens system

1994-03-01

1996-10-22

Nelms, David C.

Optical: systems and elements

Lens

With variable magnification

359784, 359785, 359690, G02B 920

Patent

active

055683223

ABSTRACT:
An image forming lens system is provided which has at least three lens groups, wherein diameters of outer most circumferences of all of the lens groups are identical, and wherein positions of at least two of the lens groups in an optical axis direction is determined by direct contact of the two lens groups.

REFERENCES:
patent: 568052 (1896-09-01), Taylor
patent: 1937168 (1933-11-01), Repp
patent: 2538077 (1951-01-01), Blosse
patent: 2962930 (1960-12-01), Johnson

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