Compact size zoom lens system

Details Compact size zoom lens system Compact size zoom lens system

1990-10-10

1994-07-05

Sugarman, Scott J.

Optical: systems and elements

Lens

With variable magnification

359684, 359689, 359715, 359716, 359717, G02B 1514, G02B 1318

Patent

active

053272900

ABSTRACT:
A new compact-size, light-weight and low-cost zoom lens system having a high optical quality with a very simple structure including, from the object side to the image side, a front lens group having a positive refractive power and a rear lens group having a negative refractive power. The zoom lens system is operated by changing the axial air distance between the front and rear lens groups during a zooming operation. The zoom lens system uses aspherical surfaces whose low-cost manufacturing has been enabled by the recent progresses in plastic molding technology and glass molding technology. Many embodiments of the lens compositions according to the present invention, and further more specific examples of the embodiments are described with figures and data that show compactness and high optical performance.

REFERENCES:
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patent: 4906077 (1990-03-01), Ito
patent: 4911539 (1990-03-01), Tsunashima et al.
patent: 4936661 (1990-06-01), Betensky et al.
"Study on the Optical Design of a Zoom Lens," by Keizo Yamaji, Cannon Research Report No. 3, 1965.

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