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42 条记录 (耗时 0.033 秒)

    Zoom lens system
    1.
    发明授权
    Zoom lens system 失效
    变焦镜头系统

    公开(公告)号：US5048939A

    公开(公告)日：1991-09-17

    申请号：US510284

    申请日：1990-04-17

    申请人： Masahiko Yatsu ,  Masaharu Deguchi ,  Takesuke Maruyama ,  Hironobu Satoh ,  Kenji Kobayashi ,  Kenji Sano

    发明人： Masahiko Yatsu ,  Masaharu Deguchi ,  Takesuke Maruyama ,  Hironobu Satoh ,  Kenji Kobayashi ,  Kenji Sano

    IPC分类号： G02B15/17

    CPC分类号： G02B15/17

    摘要： A zoom lens system comprises, from an objective sequentially, a first lens group (1) having a positive power, a second lens group and a third lens group (2) and (3) having negative power and performing a zooming function by moving along an optical axis, a fourth lens group (4) having a positive power and being always stationary, and a fifth lens group (5) having a positive power and having a triplet structure including, from an object side sequentially, a first lens (9) having a positive power, a second meniscus lens (10) having a negative power and a third lens (11) having a positive power, the fourth lens group including a lens at least one surface of which is aspherical, the first or the fifth lens group being movable as a whole or partially along an optical axis to perform a focusing function. The first, second and third lens groups satisfy the following conditions:2.7

    Automatic focusing system
    2.
    发明授权
    Automatic focusing system 失效
    自动对焦系统

    公开(公告)号：US4920420A

    公开(公告)日：1990-04-24

    申请号：US269699

    申请日：1988-11-10

    申请人： Kenji Sano ,  Takesuke Maruyama ,  Hironobu Satoh ,  Masaharu Deguchi ,  Toshio Murakami

    发明人： Kenji Sano ,  Takesuke Maruyama ,  Hironobu Satoh ,  Masaharu Deguchi ,  Toshio Murakami

    IPC分类号： H04N5/232

    CPC分类号： H04N5/23212

    摘要： There is provided an automatic focusing system which is used in a video camera or the like. A master lens is finely vibrated and moved by using a moving mechanism consisting of a stepping motor and a lead screw. A speed control circuit to set a moving speed of the master lens is provided. The moving speed of the master lens is set by an output signal of the speed control circuit and the master lens is moved by the moving mechanism. The moving speed of the master lens is optimally controlled and the out-of-step phenomenon in the stepping motor is eliminated. Since the master lens is accurately moved, the focusing operation is executed at a high accuracy. In addition, the influence by the unnecessary vibration (ringing) which is caused by the sudden change in moving speed of the master lens is eliminated. Therefore, since the master lens normally performs a predetermined micro vibration, the correct focusing can be accurately discriminated. Further, when a change in amount of the high frequency component of a video signal is large, since the moving speed of the master lens increases, the operating time until the correct focus is obtained is reduced.

    摘要翻译： 提供了一种用于摄像机等的自动对焦系统。 通过使用由步进电机和导螺杆组成的移动机构，将主镜片精细振动并移动。 提供用于设定主镜头的移动速度的速度控制电路。 主镜头的移动速度由速度控制电路的输出信号设定，主镜头由移动机构移动。 主镜头的移动速度被最佳地控制，并且消除了步进电机中的失步现象。 由于主镜头被精确地移动，所以以高精度执行聚焦操作。 此外，消除了由主镜片的移动速度的突然变化引起的不必要的振动（振铃）的影响。 因此，由于主镜头通常执行预定的微振动，因此可以准确地识别正确的聚焦。 此外，当视频信号的高频分量的变化量大时，由于主镜头的移动速度增加，所以获得正确对焦之前的操作时间被减少。

    Automatic focusing apparatus
    10.
    发明授权
    Automatic focusing apparatus 失效
    自动对焦装置

    公开(公告)号：US4782356A

    公开(公告)日：1988-11-01

    申请号：US98384

    申请日：1987-09-18

    申请人： Kenji Sano ,  Hironobu Satoh ,  Takesuke Maruyama ,  Takanori Hisada ,  Takashi Azumi

    发明人： Kenji Sano ,  Hironobu Satoh ,  Takesuke Maruyama ,  Takanori Hisada ,  Takashi Azumi

    IPC分类号： G02B7/32 ,  G02B7/30 ,  G03B13/36 ,  H04N5/232 ,  G03B3/00

    CPC分类号： G02B7/305

    摘要： An automatic focusing apparatus configured such that a projected light from a light emitting element is reflected on an object and the reflection light is passed through a flat plate so as to be received by a light receiving element. The position where the reflection light is received on the light receiving element varies depending on the distance between the apparatus and the object. This positional variation is corrected so as to receive the reflection light at the same position by changing an angle of inclination of the flat plate. A focusing lens is moved in cooperation with the adjustment of the inclination angle of the flat plate, thereby achieving the automatic focusing operation.

    摘要翻译： 一种自动对焦装置，被配置为使得来自发光元件的投影光在物体上反射并且反射光通过平板以被光接收元件接收。 反射光被接收在光接收元件上的位置根据装置和物体之间的距离而变化。 校正该位置变化，以便通过改变平板的倾斜角来接收在同一位置处的反射光。 与调整平板的倾斜角度一起移动聚焦透镜，从而实现自动聚焦操作。