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    • 7. 发明申请
    • ZOOM LENS SYSTEM HAVING IMAGING AND NON-IMAGING RANGES
    • 具有成像和非成像范围的变焦镜头系统
    • WO9918467A9
    • 1999-06-24
    • PCT/US9819982
    • 1998-09-24
    • VARI LITE INC
    • STEELE RICHARD K
    • G02B15/167F21S8/00F21S10/00G02B9/36G02B15/17F21P5/00
    • G02B15/173F21W2131/406G02B9/36
    • A project zoom les system is used in imaging and non-imaging modes for entertainment and architectural illumination, providing 8:1 zoom ratio in an imaging mode and 20:1 zoom ratio in a non-imaging mode. When coupled with a variable aperture iris, beam size control is obtained with 120:1 ratio. The lens system comprises four lens groups: a first group having a positive refractive power, a second group having a negative refractive power, a third group having a negative refractive power, and a fourth group having a positive refractive power. In the imaging mode, the third group is adjusted axially to vary magnification while the second group is adjusted axially to focus on the object. In the non-imaging mode, the second and third groups are brought into close proximity with each other and adjusted axially as a unit to vary magnification. The fourth group remains fixed and the first group can be adjusted axially to focus the image at different throw lengths.
    • 在娱乐和建筑照明的成像和非成像模式中使用项目缩放文件系统,在非成像模式下以成像模式提供8:1缩放比和20:1缩放比。 当与可变孔径光圈耦合时,以120:1的比率获得光束尺寸控制。 透镜系统包括四个透镜组:具有正折光力的第一组,具有负折光力的第二组,具有负折光力的第三组和具有正折光力的第四组。 在成像模式中,第三组轴向调节以改变放大倍数,而第二组被轴向调节以聚焦在对象上。 在非成像模式中,第二组和第三组彼此靠近并且作为一个单位被轴向地调节以改变放大率。 第四组保持固定,第一组可以轴向调节,以便以不同的投射长度聚焦图像。