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    • 62. 发明授权
    • Catadioptric telephoto objective lens system
    • 有线电视目标镜头系统
    • US3632190A
    • 1972-01-04
    • US3632190D
    • 1969-09-19
    • NIPPON KOGAKU KK
    • SHIMIZU YOSHIYUKI
    • G02B17/08
    • G02B17/0852G02B17/0808G02B17/0856G02B17/0884
    • This invention provides a reflecting-refracting, i.e. catadioptric, telephoto lens of F/7 and having an angle of field of 5*. The lens system comprises a positive meniscus lens having a convex surface directing toward an object, a main reflecting mirror of concave back surface having a refracting surface and a reflecting surface, an additional mirror of convex back surface placed near to said positive meniscus and having a refracting surface and a reflecting surface, and a concave lens cemented to said reflecting mirror through a positive lens placed therebetween and having a concave surface directing toward the object. The central portion of the main reflecting mirror is not reflecting; it allows the passage of light. The composite focal length of the negative lens, positive lens and the main mirror is negative when the light rays pass therethrough and the assembled length of the system is less than 1/3.5 of the focal length of the whole system.
    • 本发明提供了F / 7的反射折射,即反折射远摄透镜,其角度为5度。 透镜系统包括具有朝向物体的凸表面的正弯月透镜,具有折射表面的反射表面和反射表面的凹背表面的主反射镜,靠近所述正弯月面设置的凸背表面的附加镜,并且具有 折射表面和反射表面,以及凹透镜通过位于其间的正透镜胶合到所述反射镜,并具有朝向物体的凹面。 主反射镜的中心部分不反映; 它允许光线通过。 当光线通过时,负透镜,正透镜和主镜的复合焦距为负,系统的组合长度小于整个系统焦距的1 / 3.5。