Patent ID: 6308012
Filing Date: 2001-10-23
Classification: G02B

Abstract:
A two-focus switchable lens comprising a taking lens system selectively using a wide-angle-side lens and a telephoto-side lens having respective focal lengths different from each other; and a fixed shutter, disposed on an image surface side of said taking lens system, for determining an amount of exposure;said wide-angle-side lens comprising one or two positive lenses including a positive meniscus lens having a convex surface directed onto the image surface side;said telephoto-side lens comprising one positive meniscus lens having a convex surface directed onto an object side;said two-focus switchable lens satisfying the following conditional expression (1):1.2<f.sub.T /f.sub.W <2.1 (1)where f.sub.W is the focal length of said wide-angle-side lens, and f.sub.T is the focal length of said telephoto-side lens.