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    • 10. 发明授权
    • Lighting fixture zoom device, and lighting fixture comprising said zoom device
    • 照明灯具变焦装置和包括所述变焦装置的照明器具
    • US08147096B2
    • 2012-04-03
    • US12783772
    • 2010-05-20
    • Yi Zhong
    • Yi Zhong
    • G02B15/14
    • F21V14/04F21V5/048F21W2131/406G02B15/173
    • A zoom device for a lighting fixture has a first lens assembly of positive refractive power; a second lens assembly of negative refractive power; and a third lens assembly of positive refractive power.The first lens assembly, second lens assembly, and third lens assembly are aligned along a longitudinal axis coincident with the axis of a light beam emitted by a light source of the lighting fixture, and are characterized by respective focal lengths, which are such as to effectively adjust the size of the images projected by the lighting fixture, while at the same time maintaining compactness of the zoom device.
    • 用于照明器具的变焦装置具有正屈光力的第一透镜组件; 负折射力的第二透镜组件; 以及具有正屈光力的第三透镜组件。 第一透镜组件,第二透镜组件和第三透镜组件沿着与由照明器材的光源发射的光束的轴线重合的纵向轴线对准,并且其特征在于各自的焦距,其等于 有效地调整由照明灯具投影的图像的尺寸,同时保持变焦装置的紧凑性。