Offset projection zoom lens with fixed rear group for reflective

Details Offset projection zoom lens with fixed rear group for reflective Offset projection zoom lens with fixed rear group for reflective

1997-12-30

1999-12-28

Epps, Georgia

Optical: systems and elements

Lens

With variable magnification

359680, G02B 1515, G02B 1514

Patent

active

060089512

ABSTRACT:
An offset reverse telephoto projection zoom lens 300 comprising a moving zoom group 302, a moving compensation group 304, and a fixed rear lens group 306. According to one embodiment of the projection lens, the zoom group 302 has four lenses, the compensation group 304 has four lenses, and the fixed rear group 306 has three lenses. An aperture stop 308 is located in the fixed rear group 306. The fixed rear group 306 has a small diameter which helps alleviate interference with illumination optics. Additionally, a fixed rear group 306 does not require zoom mechanisms at the rear of the lens 300 where space is at a premium.

REFERENCES:
patent: 3819256 (1974-06-01), Bellows et al.
patent: 5619381 (1997-04-01), Anderson

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