公开(公告)号：US4176913A

公开(公告)日：1979-12-04

申请号：US900794

申请日：1978-04-27

申请人： Soichi Nakamura ,  Kiyoshi Hayashi

发明人： Soichi Nakamura ,  Kiyoshi Hayashi

IPC分类号： G02B9/62 ,  G02B9/64 ,  G02B13/02

CPC分类号： G02B13/02 ,  G02B9/62

摘要： A telephoto lens with large relative aperture comprises a first converging lens group, a diverging lens group and a second converging lens group arranged in this order as viewed from the object side. The first converging lens group has two positive lens components and a negative lens component spaced from each other by an air space, the group remaining fixed when focusing. The diverging lens group has a cemented negative lens component and a negative lens component with an air space therebetween which is larger than the sum of the center thickness of the former component and the center thickness of the latter component. The second converging lens group comprises a cemented lens component and remains fixed when focusing. The first converging lens group and the diverging lens group virtually form an afocal system for an object at infinity. The diverging lens group is movable along the optical axis toward the image side for focusing upon an object at a shorter distance and also toward the object side for focusing upon an object at a longer distance.

摘要翻译： 具有大的相对孔径的长焦镜头包括从物体侧观察的按顺序布置的第一会聚透镜组，发散透镜组和第二会聚透镜组。 第一会聚透镜组具有两个正透镜部件和通过空气间隔彼此隔开的负透镜部件，当聚焦时该组保持固定。 发散透镜组具有胶合负透镜部件和负透镜部件，其间具有大于前一部件的中心厚度和后一部件的中心厚度的总和的空隙。 第二会聚透镜组包括胶合透镜组件并且在聚焦时保持固定。 第一会聚透镜组和发散透镜组实际上形成无限远物体的无焦系统。 发散透镜组可以沿着光轴朝向像侧移动，用于聚焦在较短距离处的物体上，并且还朝向物体侧聚焦在较长距离处的物体上。

公开(公告)号：US4084768A

公开(公告)日：1978-04-18

申请号：US766544

申请日：1977-02-07

申请人： Kiyoshi Hayashi

发明人： Kiyoshi Hayashi

IPC分类号： B65H23/18 ,  G11B15/43 ,  G11B15/54 ,  G11B15/30

CPC分类号： G11B15/54 ,  G11B15/43

摘要： A method and apparatus for imparting a predetermined tension to a tape transported at a predetermined velocity from one to the other of reels mounted on a pair of reel spindles at least one of which is rotated by a motor to have a rotational torque imparted thereto. A signal is provided which has a frequency proportional to the number of revolutions of the reel spindle; an impulse is produced which has a frequency corresponding to the frequency of said signal; a reference voltage is integrated for a time corresponding to the period of said impulse; the peak value of a signal resulting from said integration is sample-held in accordance with said impulse; and a signal resulting from said sample-holding is applied to the motor, thereby imparting a predetermined tension to the tape.

摘要翻译： 一种将预定张力赋予预定张力的方法和装置，该预定张力以安装在一对卷轴上的卷轴的一个另一个传送到另一个卷轴，其中至少一个由马达旋转以具有赋予的旋转扭矩。 提供具有与卷轴主轴的转数成正比的频率的信号; 产生具有对应于所述信号的频率的频率的脉冲; 在与所述脉冲的周期相对应的时间内积分参考电压; 由所述积分产生的信号的峰值根据所述脉冲采样保持; 并且将由所述采样保持产生的信号施加到电动机，从而给带施加预定的张力。