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    • 88. 发明授权
    • Lens system with attachment lens removably attached
    • 带附件镜头的透镜系统可拆卸地连接
    • US4318592A
    • 1982-03-09
    • US28442
    • 1979-04-09
    • Kazuo Tanaka
    • Kazuo Tanaka
    • G02B15/02
    • G02B15/02
    • In the rear of a zoom part consisting of a variator and a compensator, preceded by a focusing lens group, is a relay lens consisting of a front lens group and a rear lens group separated by an air space in which an attachment lens is removably positioned. This attachment lens is of positive power and has a primary principal plane which is dimensioned upon attachment to lie on the object side of a secondary principal plane of the zoom part. In one embodiment, the attachment lens is constructed in the form of a Galilean telescopic system which may include a meniscus lens convex toward the front.
    • 在由变倍器和补偿器组成的变焦部分的后部,在聚焦透镜组之前,是由前透镜组和后透镜组组成的中继透镜,该透镜组和后透镜组由空气间隔开,其中附接透镜可拆卸地定位 。 该附着透镜具有正的功率,并且具有初级主平面,该主平面在附着时被设计成位于变焦部分的次要主平面的物体侧上。 在一个实施例中,附件透镜被构造为伽利略伸缩系统的形式,其可以包括朝向前方凸起的弯月透镜。