公开(公告)号：US4628298A

公开(公告)日：1986-12-09

申请号：US623843

申请日：1984-06-22

申请人： Ralph S. Hafle ,  Mark D. Love

发明人： Ralph S. Hafle ,  Mark D. Love

IPC分类号： H03M1/24 ,  G01D5/245 ,  H03M1/00

CPC分类号： G01D5/2455 ,  H03M1/282

摘要： A positional encoder which provides absolute position information from a single code track. A chain code track is positioned on a code disk to supply position words of N consecutive bits, each position word being unique and corresponding to a different position of the code disk. Means are provided for detecting the elements of the chain code as the code disk is rotated with respect to a fixed point. The position data are accumulated in the order received and N consecutive bits are examined to determine the position to which the bits correspond.

摘要翻译： 一个位置编码器，它提供单个代码轨道的绝对位置信息。 链码轨道位于码盘上以提供N个连续位的位置字，每个位置字是唯一的，并且对应于码盘的不同位置。 提供了用于在代码盘相对于固定点旋转时检测链码的元素的装置。 位置数据以接收的顺序累积，并且检查N个连续比特以确定比特对应的位置。

公开(公告)号：US3974428A

公开(公告)日：1976-08-10

申请号：US470166

申请日：1974-05-15

申请人： Ralph S. Hafle

发明人： Ralph S. Hafle

IPC分类号： G02B23/16 ,  G05D13/62 ,  H02P7/288 ,  H02P23/00 ,  H02P5/32

CPC分类号： H02P23/186 ,  Y10S388/902 ,  Y10S388/912

摘要： The disclosed system utilizes digital electronic programming to establish the rotational or translational speed of a motor driven member. The desired speed can be selected by manipulating a set of digital switches. A stable oscillator is employed to generate a high frequency signal which is processed by frequency dividers to produce a modulaton frequency signal. The modulation frequency is supplied to an optical encoder having a rotary shaft adapted to be connected to a rotary member, the speed of which is to be controlled. The encoder is constructed and arranged to produce a phase variable output signal at the modulation frequency, the phase of such output signal being variable as a function of the shaft angle. The high frequency signal is also processed by digital circuits under the control of the digital selector switches to produce a variable reference frequency signal having a frequency corresponding to the modulation frequency plus or minus a number which is established by the setting of the selector switches. The speed control system includes means for comparing the frequency of the phase variable signal with the frequency of the reference signal. This comparison circuit controls a motor operating circuit which increases or decreases the speed of the drive motor for the rotary member, until the phase variable signal has the same frequency and phase as the reference signal. The digital generation of the reference frequency signal insures that its frequency is established and maintained with an extremely high degree of accuracy.

摘要翻译： 所公开的系统利用数字电子程序来建立电动机驱动构件的旋转或平移速度。 可以通过操纵一组数字开关来选择所需的速度。 采用稳定的振荡器来产生由分频器处理以产生调制频率信号的高频信号。 调制频率被提供给具有旋转轴的光学编码器，旋转轴适于连接到旋转构件，其速度将被控制。 编码器被构造和布置成产生调制频率的相位可变输出信号，这种输出信号的相位可以作为轴角度的函数而变化。 高频信号也由数字电路在数字选择开关的控制下进行处理，以产生具有与调制频率相对应的频率的可变参考频率信号加上或减去由选择器开关的设置建立的数字。 速度控制系统包括用于将相位可变信号的频率与参考信号的频率进行比较的装置。 该比较电路控制电动机操作电路，其增加或减小用于旋转构件的驱动电动机的速度，直到相位可变信号具有与参考信号相同的频率和相位。 参考频率信号的数字生成确保其频率以非常高的精度建立和维持。

公开(公告)号：US3976997A

公开(公告)日：1976-08-24

申请号：US262596

申请日：1972-06-14

申请人： Ralph S. Hafle

发明人： Ralph S. Hafle

IPC分类号： H03M1/66 ,  G01D5/249 ,  H03M1/00 ,  H03K13/02

CPC分类号： H03M1/26

摘要： The disclosed encoder is adapted to produce both digital and analog output signals corresponding to the angular position of a rotary shaft, or the position of any other movable member. The digital signals comprise a series of binary signals constituting a multi-digit code word which defines the angular position of the shaft with a degree of resolution which depends upon the number of digits in the code word. The basic binary signals are produced by photocells actuated by a series of binary tracks on a code disc or member. The analog signals are in the form of a series of ramp signals which are related in length to the least significant bit of the digital code word. The analog signals are derived from sine and cosine tracks on the code disc. Such tracks are read by photocells which produce signals corresponding to the sine and cosine of the shaft angle. Such sine and cosine signals are modulated with cosine and sine timing signals produced by a free-running clock, and the modulated signals are then combined to produce a sine signal at the frequency of the clock but varying in phase in accordance with the shaft angle. By comparing the variable phase signal with hysteresis signals derived from the clock, the variable phase signal is converted into pulses of variable length corresponding to the shaft angle. The hysteresis signals are basically timing pulses as to which alternate pulses are subject to slight timing variations which produce a hysteresis effect. The hysteresis signals eliminate ambiguities in the generation of the analog signals. The variable length pulses are integrated to produce the ramp signals which constitute the analog output. The least significant bit of the digital output is produced by processing the variable phase signal from the analog circuit. All of the other digital signals are synchronized accurately with the least significant bit by correction circuits which insure that the accuracy of all of the binary signals is established by the signal for the least significant bit.

公开(公告)号：US5017772A

公开(公告)日：1991-05-21

申请号：US358831

申请日：1989-05-30

申请人： Ralph S. Hafle

发明人： Ralph S. Hafle

IPC分类号： G01D5/26

CPC分类号： G01D5/268

摘要： A fiber optic probe sensor for accurate measurement of displacement of a target over very small distances is disclosed. The probe sensor is comprised of plurality of light emitting fibers exclusively occupying a central region and connected to a light source for illuminating the target; a first and second plurality of light receiving fibers arrayed in two concentric regions exterior to and at two different distances from the central region, and means for measuring reflected light received from the target and for generating an output proportional to the light received and independent of target reflectivity or light source variation.

摘要翻译： 公开了一种用于在非常小的距离上精确测量目标的位移的光纤探针传感器。 探针传感器由多个发光纤维组成，其独占占据中心区域并连接到用于照射目标的光源; 排列在距离中心区域两个不同距离的两个同心区域中的第一和第二多个光接收光纤，以及用于测量从目标接收的反射光并用于产生与所接收的光并且独立于目标成比例的输出的装置 反射率或光源变化。

公开(公告)号：US4362358A

公开(公告)日：1982-12-07

申请号：US177832

申请日：1980-08-13

申请人： Ralph S. Hafle

发明人： Ralph S. Hafle

IPC分类号： H03M1/00 ,  G02B5/14

CPC分类号： H03M1/26

摘要： A multidigit fiber optic encoder having only one or two fiber optic cables between an active zone containing a light source and photodetectors, and a passive zone containing a multidigit code member having a multitude of code tracks. First and second sets of color filters are associated with the code tracks and the photodetectors, so that each code track modulates light of a different color, which is transmitted to only the corresponding photodetector. The light beams of the different colors are combined for transmission between the passive and active zones. A single fiber optic cable may be employed between the active and passive zones for transmitting light in both directions, by providing first and second beam splitters at the active and passive ends of the cable to split the transmitted and received light. Alternatively, two fiber optic cables may be employed to transmit light in the opposite directions, to obviate any need for the beam splitters. The light source provides white light or light containing multiple spectral lines, for illuminating all of the code tracks.

摘要翻译： 在包含光源的活动区域和光电检测器之间仅具有一条或两条光纤电缆的多位光纤编码器以及包含具有多个代码轨道的多位代码部件的被动区域。 第一和第二组滤色器与代码轨道和光电探测器相关联，使得每个码轨迹调制不同颜色的光，其仅发送到相应的光电检测器。 不同颜色的光束被组合以在被动和有源区域之间传输。 可以通过在电缆的主动和被动端处提供第一和第二分束器来分离发射和接收的光，在主动和无源区域之间采用单个光纤电缆，用于在两个方向上传输光。 或者，可以使用两条光纤电缆在相反的方向上透射光，以避免对分束器的任何需要。 光源提供包含多个光谱线的白光或光，用于照亮所有的码轨。