Zoom lens capable of obtaining focal lengths beyond a variable focal
length range
    2.
    发明授权
    Zoom lens capable of obtaining focal lengths beyond a variable focal length range 失效
    变焦镜头能够获得超过可变焦距范围的焦距

    公开(公告)号:US4830477A

    公开(公告)日:1989-05-16

    申请号:US724280

    申请日:1985-04-17

    CPC分类号: G02B15/173

    摘要: A zoom lens comprising, from front to rear, a first zoom section and a second zoom section, the first zoom section having a plurality of movable lens units which simultaneously move to effect zooming, and the second zoom section having a plurality of axially movable lens units, the light beam exiting from the rearmost unit in the first section enters directly the frontmost unit in the second section, and the refractive powers of the front and rear lens units are made positive and negative respectively, whereby the front and rear lens units are simultaneously moved in such a way that the magnifying power of the rear lens unit remains positive when the focal length of the entire system varies.

    摘要翻译: 一种变焦透镜,包括从前到后的第一变焦部分和第二变焦部分,所述第一变焦部分具有同时移动以实现变焦的多个可移动透镜单元,并且所述第二变焦部分具有多个可轴向移动的透镜 在第一部分中从最后面单元排出的光束直接进入第二部分中的最前面的单元,并且前后透镜单元的折射力分别为正负透镜单元, 同时移动,使得当整个系统的焦距变化时,后透镜单元的放大倍率保持为正。

    Zoom lens
    4.
    发明授权
    Zoom lens 失效
    变焦镜头

    公开(公告)号:US4629294A

    公开(公告)日:1986-12-16

    申请号:US622713

    申请日:1984-06-20

    CPC分类号: G02B15/173

    摘要: A zoom lens includes, from front to rear, a positive first component, a negative second component, a positive third component and a positive or negative fourth component. The first, third and fourth components are movable to vary the focal length of the entire system. In the wide angle position, the image modification of the third component contributes to the ratio of the focal length of the third component to the focal length of the fourth component, and the ratio of that fraction of the zoom ration of the entire system which the second component assumes to the zoom ratio of the entire system, satisfies specific conditions such that minimization of the bulk and size of the zoom lens and a stabilized correction of aberrations are achieved.

    摘要翻译: 变焦透镜从前到后包括正的第一分量,负的第二分量,正的第三分量和正或负的第四分量。 第一,第三和第四组件可移动以改变整个系统的焦距。 在广角位置,第三分量的图像修正有助于第三分量的焦距与第四分量的焦距的比率,以及整个系统的变焦比率的比率 第二分量假定为整个系统的变焦比,满足特定条件,使得实现变焦透镜的体积和尺寸的最小化以及稳定的像差校正。

    High range zoom lens
    5.
    发明授权
    High range zoom lens 失效
    高范围变焦镜头

    公开(公告)号:US4695133A

    公开(公告)日:1987-09-22

    申请号:US717376

    申请日:1985-03-29

    CPC分类号: G02B15/173

    摘要: The disclosed zoom lens includes, from front to rear, a first lens unit of positive power, a second lens unit of negative power, a third lens unit of positive power, and a fourth lens unit. When zooming, the first and third lens units are axially moved independently of each other, the second lens unit remains stationary, and the fourth lens unit is axially moved but changes the direction of advance at an intermediate point in the zooming range.

    摘要翻译: 所公开的变焦镜头包括从前到后的正功率的第一透镜单元,负功率的第二透镜单元,正光焦度的第三透镜单元和第四透镜单元。 当变焦时,第一透镜单元和第三透镜单元彼此独立地轴向移动,第二透镜单元保持静止,并且第四透镜单元轴向移动,但是在变焦范围的中间点改变前进方向。

    Compact zoom lens
    6.
    发明授权
    Compact zoom lens 失效
    紧凑型变焦镜头

    公开(公告)号:US4666257A

    公开(公告)日:1987-05-19

    申请号:US705565

    申请日:1985-02-26

    CPC分类号: G02B15/173

    摘要: A compact zoom lens including, from front to rear, a first lens unit of positive power, a second lens unit of negative power, a third lens unit of positive power and, if desired, further a fourth lens unit, with the separations between the first and second units, between the second and third units and between the third and fourth units being made variable to vary the focal length of the entire system, wherein as the focal length is varied from the shortest to the longest value, the first and third units move axially forward, and the third unit is provided with a positive lens having an aspherical surface.

    摘要翻译: 一种紧凑型变焦透镜,包括从前到后具有正功率的第一透镜单元,负功率的第二透镜单元,正光焦度的第三透镜单元,以及如果需要的话,还具有第四透镜单元, 在第二单元和第三单元之间以及第三单元和第四单元之间的第一单元和第二单元是可变的,以改变整个系统的焦距,其中当焦距从最短到最长值变化时,第一和第三单元 单元轴向向前移动,并且第三单元设置有具有非球面的正透镜。

    Zoom lens capable of selecting a focal length beyond a standard focal
length range
    7.
    发明授权
    Zoom lens capable of selecting a focal length beyond a standard focal length range 失效
    变焦镜头能够选择超出标准焦距范围的焦距

    公开(公告)号:US4865434A

    公开(公告)日:1989-09-12

    申请号:US782584

    申请日:1985-10-01

    IPC分类号: G02B15/173

    CPC分类号: G02B15/173

    摘要: A zoom lens including, from front to rear, a first lens unit of positive power, a second lens unit of negative power and a third lens unit of positive power, wherein for a standard focal length range at least the first and second lens units move simultaneously and independently of each other, and to obtain a focal length beyond the standard range, at least the second lens unit moves, whereby the locus of movement of the first lens unit bends at an end of the standard range, and as the standard range is exceeded, the first lens unit either remains stationary or moves forward.

    摘要翻译: 一种变焦透镜,包括从前到后的正功率的第一透镜单元,负功率的第二透镜单元和正光焦度的第三透镜单元,其中对于标准焦距范围,至少第一和第二透镜单元移动 同时且彼此独立,并且为了获得超过标准范围的焦距,至少第二透镜单元移动,由此第一透镜单元的移动轨迹在标准范围的末端弯曲,并且作为标准范围 超过,第一个镜头单元保持静止或向前移动。

    Zoom lens
    9.
    发明授权
    Zoom lens 失效
    变焦镜头

    公开(公告)号:US5179473A

    公开(公告)日:1993-01-12

    申请号:US591264

    申请日:1990-10-01

    CPC分类号: G02B15/177

    摘要: A zoom lens includes, in succession from the greatly conjugate side to the little conjugate side, a first lens unit having negative refractive power, and a second lens unit having positive refractive power. Zooming from the wide angle side to the telephoto side is effected by at least the second lens unit being moved toward the greatly conjugate side. The zoom lens satisfies the following condition:bf.sub.w /f.sub.w >1.6,where f.sub.w is the focal length of the entire system at the wide angle end, and bf.sub.w is the distance from the last lens surface of the second lens unit to the little conjugate side.

    摘要翻译: 变焦透镜从大体积共轭侧依次包括具有负屈光力的第一透镜单元和具有正屈光力的第二透镜单元。 通过至少第二透镜单元向大的共轭侧移动,从广角侧向望远侧放大。 变焦透镜满足以下条件:bfw / fw> 1.6,其中fw是广角端处整个系统的焦距,bfw是从第二透镜单元的最后透镜表面到小共轭侧的距离 。

    Projection apparatus
    10.
    发明授权
    Projection apparatus 失效
    投影仪

    公开(公告)号:US5096288A

    公开(公告)日:1992-03-17

    申请号:US586135

    申请日:1990-09-21

    CPC分类号: H04N9/3185 G02B27/0025

    摘要: A projection display apparatus, which projects a magnified image onto a screen, comprises an image forming system, such as a display panel, a projector including a plurality of lenses for projecting the image onto the screen, and a decentering mechanism for decentering some lenses in the projector with respect to the optical axis. Even if the image is distorted by arrangement of the screen and the optical axis and so on, the distortion is compensated by decentering the lenses and producing a decentering distortion.

    摘要翻译: 将放大图像投影到屏幕上的投影显示装置包括诸如显示面板的图像形成系统,包括用于将图像投影到屏幕上的多个透镜的投影仪,以及用于使一些透镜偏心的偏心机构 投影仪相对于光轴。 即使图像通过屏幕的布置和光轴等而失真,通过使透镜偏心并产生偏心变形来补偿失真。