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公开(公告)号：EP0597705A1
公开(公告)日：1994-05-18
申请号：EP93309018.5
申请日：1993-11-11
CPC分类号： G01D5/34715
摘要： An encapsulated reflective sensor for use in conjunction with a code wheel (34) for determining the motion and position of a shaft has a light emitting device (8) and photo-detector array (12) contained within a transparent encapsulant (2). The encapsulant (2) has a convex curved surface (6,40,42) which prevents light from the light emitting device from impinging on the photodetector array (12). An emitter lens (40) is formed by the convex curved surface between the light emitting device (8) and the code wheel (34). The emitter lens (40) magnifies and concentrates the light toward the code wheel (34). As the code wheel (34) turns with the shaft, the light incident on the wheel is modulated and reflected toward the photodetector array (12). A second detector lens (42) may be used between the code wheel (34) and photodetector array (12) for concentrating the modulated light reflected from the code wheel (34) toward the photodetector array (12).
摘要翻译： 与用于确定轴的运动和位置的代码轮（34）一起使用的封装反射传感器具有包含在透明密封剂（2）内的发光器件（8）和光电检测器阵列（12）。 密封剂（2）具有凸起的弯曲表面（6,40,42），其防止来自发光器件的光照射在光电检测器阵列（12）上。 发光透镜（40）由发光装置（8）和编码轮（34）之间的凸曲面形成。 发射透镜（40）将光朝向码盘（34）放大并集中。 随着码轮（34）与轴一起转动，入射到车轮上的光被调制并朝向光电检测器阵列（12）反射。 可以在码盘（34）和光电检测器阵列（12）之间使用第二检测器透镜（42），用于将从码轮（34）反射的调制光集中到光电检测器阵列（12）。
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2.发明公开
公开(公告)号：EP0376538A2
公开(公告)日：1990-07-04
申请号：EP89312949.4
申请日：1989-12-12
CPC分类号： G01D5/249 , G01D5/24438 , H03M1/0678 , H03M1/301
摘要： An optical shaft angle encoder has a plurality of active photodiodes (26) in an array on a semiconductor chip. A rotating code wheel (3) has alternating areas (13, 15) for alternately illuminating or not illuminating the active photodiodes (26) in response to the rotation of the wheel (3). Errors in the duty cycle involving the end active photodiodes (26) in the array are largely avoided by having a plurality of inactive photodiodes (27) at each end of the array with width and electrical properties effectively the same as the active photodiodes (26) so that leakage current to each end active photodiode (26) of the array is substantially equal to the leakage current to active photodiodes (26) remote from the end of the array. Similarly, leakage current which may affect the duty cycle of individual photodiodes (26) may be minimized by surrounding the individual photodiodes with a reverse biased photodiode junction.
摘要翻译： 光轴角度编码器在半导体芯片上具有阵列中的多个有源光电二极管（26）。 旋转代码轮（3）具有交替的区域（13,15），用于响应于车轮（3）的旋转而交替地照亮或不照亮活动光电二极管（26）。 通过在阵列的每个端部具有多个非活性光电二极管（27），其宽度和电性能与有源光电二极管（26）有效地相同，从而大大避免了涉及阵列中末端有源光电二极管（26）的占空比的错误， 使得到阵列的每个端部有源光电二极管（26）的漏电流基本上等于远离阵列端部的有源光电二极管（26）的漏电流。 类似地，可以通过用反向偏置的光电二极管接头围绕各个光电二极管，可以最小化可能影响各个光电二极管（26）的占空比的漏电流。
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公开(公告)号：EP0376538B1
公开(公告)日：1995-08-09
申请号：EP89312949.4
申请日：1989-12-12
CPC分类号： G01D5/249 , G01D5/24438 , H03M1/0678 , H03M1/301
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公开(公告)号：EP0376538A3
公开(公告)日：1992-10-21
申请号：EP89312949.4
申请日：1989-12-12
CPC分类号： G01D5/249 , G01D5/24438 , H03M1/0678 , H03M1/301
摘要： An optical shaft angle encoder has a plurality of active photodiodes (26) in an array on a semiconductor chip. A rotating code wheel (3) has alternating areas (13, 15) for alternately illuminating or not illuminating the active photodiodes (26) in response to the rotation of the wheel (3). Errors in the duty cycle involving the end active photodiodes (26) in the array are largely avoided by having a plurality of inactive photodiodes (27) at each end of the array with width and electrical properties effectively the same as the active photodiodes (26) so that leakage current to each end active photodiode (26) of the array is substantially equal to the leakage current to active photodiodes (26) remote from the end of the array. Similarly, leakage current which may affect the duty cycle of individual photodiodes (26) may be minimized by surrounding the individual photodiodes with a reverse biased photodiode junction.
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