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    • 3. 发明授权
    • Compact zoom lens
    • 紧凑型变焦镜头
    • US4854681A
    • 1989-08-08
    • US931537
    • 1986-11-14
    • Masatake KatoSadahiko TsujiMuneharu SugiuraKazuo Tanaka
    • Masatake KatoSadahiko TsujiMuneharu SugiuraKazuo Tanaka
    • G02B15/173
    • G02B15/173
    • A compact zoom lens comprising, from front to rear, a first lens unit of positive power for focusing, a second lens unit of negative power axially movable in one direction when zooming from one end of a range of image magnification to the other, a third lens unit of positive power axially movable in a path convex toward the rear to maintain the constant position of an image surface which shifts with zooming, and a fourth lens unit of positive power for forming an image which remains stationary during zooming, wherein a fixed diaphragm is arranged in a space between the second and third lens units.
    • 一种紧凑型变焦透镜,包括从前到后具有用于聚焦的正光焦度的第一透镜单元,当从一定范围的图像放大倍数的一端变焦到另一方向时可以沿一个方向轴向移动的负光焦度的第二透镜单元, 具有正向功率的透镜单元,其在朝向后方凸出的路径中可轴向移动,以保持图像表面随着变焦而移动的恒定位置,以及用于形成在变焦期间保持静止的图像的正电力的第四透镜单元,其中, 布置在第二和第三透镜单元之间的空间中。