Zoom lens system for use with a compact camera

Details Zoom lens system for use with a compact camera Zoom lens system for use with a compact camera

1994-03-16

1995-07-18

Ben, Loha

Optical: systems and elements

Lens

With variable magnification

359676, 359691, G02B 1514

Patent

active

054347122

ABSTRACT:
A zoom lens system for use with a compact camera comprises, in order from the object side, a first lens group having a positive focal length and a second lens group having a negative focal length and which performs zooming by changing the distance between the first and second lens groups. The first lens group comprises, in order from the object side, a subgroup 1a of a small power that is composed of a positive first lens and a negative second lens and a subgroup 1b of a large positive power that has a cemented surface of a negative power on the image side. The subgroup 1a has at least one aspheric surface that has a divergent amount of asphericity with respect to a paraxial radius of curvature.

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Ulrich Greis, "Injection Molding of Plastic Optics," Symposium on Optical Surface Technology, Proceedings (Apr. 12-14, 1983), pp. 69-76.
Walter Besematter, "Zur Stabilisierung eingacer Variatoren mittels Aspharen," Optik, vol. 57, No. 1 (1980), pp. 123-124.
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