Patent
1977-09-21
1979-06-05
Clark, Conrad J.
G02B 1516
Patent
active
041572122
ABSTRACT:
A large aperture miniature wide-angle zoom lens system is constructed as a two component-type lens system comprising a front lens group which is movable relative to a rear lens group. The front lens group is composed of four lens elements, and the rear lens group is composed of either five or six lens elements. In order from the object side to the image side, the first lens is a positive lens having its surface of greater curvature directed toward the object. The second lens is a negative meniscus lens, and the third lens is a double concave lens. The surfaces of greater curvature of both the second and third lenses are directed toward the image. The fourth lens is a positive lens having its surface of greater curvature directed toward the object. The front lens group composed of the first, second, third and fourth lenses has a negative resultant focal length. The rear lens group has a positive resultant focal length and comprises a double concave lens and first and second positive lens components respectively positioned on the object and image sides of the double concave lens. The first positive lens component includes at least two positive lenses, one of which is a double convex lens. The second positive lens component includes two positive lenses, the surfaces of greater curvature of which are directed toward the image.
Asahi Kogaku Kogyo Kabushiki Kaisha
Clark Conrad J.
LandOfFree
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