公开(公告)号：US3970845A

公开(公告)日：1976-07-20

申请号：US625048

申请日：1975-10-23

申请人： David L. Hollis ,  Richard G. Magner

发明人： David L. Hollis ,  Richard G. Magner

IPC分类号： G01N15/14 ,  G05D3/14 ,  H01J39/12

CPC分类号： G01N15/1468 ,  G05D3/14

摘要： A pulse discriminator circuit for use in a closed loop scanning and positioning system for finding and positioning white blood cells. The surface of a slide is scanned to produce an optical signal which is converted by a sensor into an electrical signal. This signal is applied to the pulse discriminator circuit which provides an output pulse only when a white blood cell is being scanned. The output of the pulse discriminator is coupled to a logic circuit which produces signals that are used to drive the microscope stage to cause the white blood cell to be positioned within a small aperture in the optical system.

摘要翻译： 一种用于发现和定位白细胞的闭环扫描和定位系统中的脉冲鉴别器电路。 扫描幻灯片的表面以产生由传感器转换成电信号的光信号。 该信号被施加到仅在扫描白细胞时提供输出脉冲的脉冲鉴别器电路。 脉冲鉴别器的输出耦合到逻辑电路，该逻辑电路产生用于驱动显微镜载物台以使白细胞位于光学系统的小孔内的信号。

公开(公告)号：US4761812A

公开(公告)日：1988-08-02

申请号：US807085

申请日：1985-12-10

申请人： David L. Hollis ,  John L. Reynolds, III

发明人： David L. Hollis ,  John L. Reynolds, III

IPC分类号： H04M19/00

CPC分类号： H04M19/008

摘要： A line circuit is described which provides isolated power to a subscriber telephone line in a manner that produces a constant power characteristic over the normal range of telephone line loop resistance. The isolated feed characteristic of the present invention simplifies protection against lightning and other transients. The constant power characteristic limits power dissipation under short loop, i.e. low resistance, or short circuit conditions yet allows enough current flow under short loop conditions to activate the voice level reducing varistor in the telephone sufficiently to prevent excessive loudness. This eliminates the need for additional circuits at the telephone central office for detecting short loops and for providing voice frequency (VF) level attenuation under such conditions.

摘要翻译： 描述了以在电话线路回路电阻的正常范围内产生恒定功率特性的方式向用户电话线路提供隔离电力的线路电路。 本发明的隔离进料特性简化了防雷击和其它瞬变的保护。 恒定功率特性限制了在短路环路（即低电阻或短路条件）下的功率耗散，但是在短路环境下允许足够的电流流动来激活电话中的语音电平，从而足以防止过大的响度。 这消除了在电话中心局需要额外的电路来检测短路环路，并且在这种条件下提供话音频率（VF）电平衰减。

公开(公告)号：US3967108A

公开(公告)日：1976-06-29

申请号：US543514

申请日：1975-01-23

申请人： David L. Hollis

发明人： David L. Hollis

IPC分类号： G01N15/14 ,  G02B27/16 ,  G05D3/18 ,  G01J1/20

CPC分类号： G01N15/1468 ,  G02B27/16 ,  G05D3/183

摘要： In a system which automatically analyzes laboratory slides, the adjustable objective lens is automatically focused. A beam splitter splits light from the slide into two parts. One slide image is projected to an actual image plane where it is converted into electrical signals representing the optical characteristics of the slide. The other slide image is projected to a parfocal image plane at which two light sensing devices for the focusing system are positioned. One light sensing device is in front of the parfocal image plane and the other is behind the parfocal image plane. These light sensing devices produce electrical signals representing the position of the actual image plane with respect to the desired image plane. The electric signals are differentiated and then applied to a comparator which supplies pulses to a stepping motor which moves the objective lens. The coupling between the stepping motor and the objective lens includes an eccentric member which translates the objective lens with no sliding friction. This allows very accurate positioning of the objective lens.

摘要翻译： 在自动分析实验室幻灯片的系统中，可调物镜自动聚焦。 分束器将来自滑块的光分成两部分。 将一张幻灯片图像投影到实际的图像平面，在其中将其转换为表示幻灯片的光学特性的电信号。 另一个幻灯片图像被投影到对焦图像平面，在该平面中用于聚焦系统的两个光感测装置被定位。 一个光感测装置在对焦图像平面的前方，另一个在对焦图像平面之后。 这些感光装置产生表示实际图像平面相对于所需图像平面的位置的电信号。 电信号被微分，然后施加到向移动物镜的步进电机提供脉冲的比较器。 步进电机和物镜之间的耦合包括偏心构件，其在不产生滑动摩擦的情况下平移物镜。 这允许物镜的非常精确的定位。