Compact-size zoom lens system

Details Compact-size zoom lens system Compact-size zoom lens system

1990-12-05

1992-10-06

Sugarman, Scott J.

Optical: systems and elements

Lens

With variable magnification

359716, 359739, G02B 1514, G02B 1318

Patent

active

051537770

ABSTRACT:
A compact-size, light-weight, low-cost zoom lens system with high optical quality is achieved by using a ray restrictor placed at the most object side of the zoom lens system. In one type, the ray resistor shifts toward the object at a speed different from that of the most object side lens of the zoom lens system as the zoom lens system is zoomed toward the longest focal length, which effectively blocks harmful rays causing coma flare in the peripheral area. In another type, the aperture diameter of the ray restrictor varies according to a zooming operation. The ray restrictor of any type is especially effective when used in a zoom lens system composed of two lens groups. By introducing one or more aspherical surfaces satisfying a certain condition (or conditions) in the zoom lens system, various aberrations are further favorably corrected.

REFERENCES:
patent: 4705363 (1987-11-01), Ikemori
patent: 4838667 (1989-06-01), Ueda
patent: 4936661 (1990-06-01), Betensky et al.

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