Lens system with master lens system and conversion lens

Details Lens system with master lens system and conversion lens Lens system with master lens system and conversion lens

1994-06-06

1996-04-30

Epps, Georgia Y.

Optical: systems and elements

Lens

Selective magnification by exchanging or adding a lens...

359756, 359757, G02B 1502

Patent

active

055130429

ABSTRACT:
A lens system includes a master lens system and a conversion lens system. The master lens system has a first lens, a second lens, a third lens, and a fourth lens, which are sequentially arranged from an object side of the lens system to an image side thereof, and has a first diaphragm which is arranged between the third lens and the fourth lens. The first lens is a positive meniscus lens having a convex surface toward the object side. The second lens is a negative lens. The third lens is a positive lens. The fourth lens is a negative meniscus lens having a concave surface toward the object side. The conversion lens system is arranged in such a manner that the conversion lens system can be freely inserted and removed between the third lens and the fourth lens of the master lens system. When the conversion lens system is inserted and removed between the third lens and the fourth lens, relative positions of the respective first, second, third and fourth lenses are fixed, and a focal length of the lens system becomes shorter than a focal length of the master lens system.

REFERENCES:
patent: 4368956 (1983-01-01), Yamada et al.
patent: 4596447 (1986-06-01), Yamada et al.
patent: 4708442 (1987-11-01), Fujii et al.

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