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公开(公告)号：US4459475A
公开(公告)日：1984-07-10
申请号：US363181
申请日：1982-03-29
申请人： John R. Flint , Robert F. Johnston
发明人： John R. Flint , Robert F. Johnston
CPC分类号： H03G3/30 , H03G3/3015
摘要： A method and system for automatically calibrating a D.C. transducer are described in the environment of an illustrative film retrieval system. In this system, the output of a transducer such as a light sensor is amplified and the amplified output is compared to upper and lower limits within which it is desired to hold the transducer's amplified output. When either of the limits is exceeded, the amplification of the transducer's output is varied so as to shift its average value to a value which is between the upper and lower limits.
摘要翻译： 在说明性电影检索系统的环境中描述了用于自动校准直流传感器的方法和系统。 在该系统中，诸如光传感器的换能器的输出被放大，并且将放大的输出与希望保持换能器的放大输出的上限和下限进行比较。 当超过极限值时，换能器输出的放大变化，以将其平均值移动到上限和下限之间的值。
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公开(公告)号：US4448364A
公开(公告)日：1984-05-15
申请号：US366948
申请日：1982-04-09
CPC分类号： B65H20/38 , G11B15/444
摘要： A web drive system for automatically reversing the direction of travel of the web when the end of the web is reached. A reversible electric motor provides power to either the supply or take up spindles. An end of the web is affixed to each of the spindles so that either spindle can be provided with power to draw the web from the other spindle. A planetary gear system provides power to whichever spindle acts as the take up spindle until the end of the web is sensed. The motor is then reversed and the planetary gear then provides power to the other spindle, which was previously the supply spindle.
摘要翻译： 一种卷筒纸驱动系统，用于在纸幅末端到达时自动反转纸幅的行进方向。 可逆电动机为供应或卷绕主轴提供动力。 网的一端固定到每个主轴上，使得任一个主轴可以设置有从另一个主轴牵引卷材的动力。 行星齿轮系统为主轴作为卷取轴提供动力，直到感测到卷筒纸的末端。 然后马达被反转，然后行星齿轮向另一个主轴提供电力，这是以前的供应主轴。
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公开(公告)号：US4032934A
公开(公告)日：1977-06-28
申请号：US536666
申请日：1974-12-26
摘要： This invention relates to photographic apparatus having means for automatically moving a lens along an axis for properly focusing on an object. The apparatus includes a light emitter for transmitting a train of light signals toward the object at a constant angle relative to the axis, and a pair of movable photoreceptors disposed in spaced relationship with the emitter in the apparatus. The photoreceptors are adapted to receive the light signals upon reflection thereof from the object, and are further adapted to produce electrical signals corresponding to the amount of light received. An operational amplifier is adapted to receive the electrical signals produced by the photoreceptors, and produce a difference signal corresponding to the difference in strength of the electrical signals. The apparatus further includes an electric motor, responsive to the difference signal, adapted to cause the movement of the lens along the axis, and further adapted to cause the movement of the photoreceptors until the amount of light received at each of the photoreceptors is equalized to produce an absolute minimal difference signal indicative of the object being properly focused by the lens. A gain change device is provided to increase the amplitude of the difference signal when relatively far objects are focused on.
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公开(公告)号：US3984846A
公开(公告)日：1976-10-05
申请号：US538228
申请日：1975-01-02
CPC分类号： G02B7/32
摘要： A photographic apparatus having a lens movable along an axis for automatically focusing an object to be photographed is disclosed. The apparatus includes a rotatable sleeve controlled by electrical signals produced by photoreceptor means adapted to receive light emitted by the apparatus and reflected from the object. The sleeve effectuates the movement of the lens along an axis to bring the object into focus. The apparatus further includes assembly means, carrying the photoreceptor means, pivotably secured to the sleeve for adjusting the light received by the photoreceptor means by an amount corresponding to the rotation of the sleeve, thereby changing the electrical signals to maintain the object in focus.
摘要翻译： 公开了一种摄影装置，具有可沿轴线移动的透镜，用于自动聚焦被拍摄物体。 该设备包括由适于接收由该设备发射的光并从该物体反射的感光体产生的电信号控制的可旋转套筒。 套筒使镜片沿轴线移动，使物体聚焦。 该装置还包括组装装置，其携带感光器装置，可枢转地固定到套筒上，用于将由感光器装置接收的光调节到与套筒旋转相对应的量，从而改变电信号以保持物体聚焦。
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公开(公告)号：US4120573A
公开(公告)日：1978-10-17
申请号：US700704
申请日：1976-06-28
CPC分类号： G03B21/115
摘要： A microfiche reader stores a library file of microfiche in a cartridge which may be inserted into the reader, so that it is not necessary to manually manipulate the individual microfiche. The reader automatically extracts and feeds a selected microfiche from a cartridge and then returns it to the vacated cartridge location. A right angle rack and pinion causes the extractor mechanism to provide an automatic feed mechanism which moves over a horizontal advance, raise, drop and back path so that hooks may be removed from and then returned into notches in a microfiche carrier, without damaging them. An automatic elevator mechanism positions the cartridge so that any selected microfiche may be placed on display.
摘要翻译： 缩微胶片读取器将微胶卷的库文件存储在可以插入读取器中的墨盒中，使得不需要手动操作单个缩微胶片。 阅读器会自动从墨盒中提取并提取选定的缩微胶片，然后将其退回到空出的墨盒位置。 直角齿条和小齿轮使得提取机构提供自动进给机构，该自动进给机构在水平前进，上升，下降和后退路径上移动，使得钩可以在缩微胶片载体中被移除并且然后返回到凹槽中而不损坏它们。 自动升降机构定位盒，使得任何选定的缩微胶片可以放置在显示器上。
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