公开(公告)号：US5451776A

公开(公告)日：1995-09-19

申请号：US169474

申请日：1993-12-17

申请人： Bruce G. Kolloff ,  Jeffrey S. Schoenwald ,  Steve Beccue ,  Mohsen Khoshnevisan

发明人： Bruce G. Kolloff ,  Jeffrey S. Schoenwald ,  Steve Beccue ,  Mohsen Khoshnevisan

IPC分类号： G11B19/20 ,  G01D5/249 ,  G01D5/347 ,  G01D5/34

CPC分类号： G01D5/3473 ,  G01D5/2497

摘要： An interferometrically readable optical encoder for sensing linear position includes an optical medium movable in a linear direction and having a data storage layer, a plurality of uniformly sized sectors being defined in the layer. A linear absolute track is defined in the layer parallel to the linear direction and a plurality of absolute marks is formed in the layer in sequence along the absolute track within each sector, each such absolute mark being detectable by interferometric reflection of coherent light as representative of a binary 1 or a binary 0 and each such plurality of absolute marks defining a binary word. A linear incremental track is defined in the layer parallel to the linear direction with a series of incremental marks formed in the layer and evenly spaced along the first incremental track, each such incremental mark being detectable by interferometric reflection of coherent light. The binary word in a sector is read to identify the position of that sector in the linear direction and indicate the approximate position of the medium. The incremental marks refine the approximate position indication to provide a more precise position of the medium.

摘要翻译： 用于感测线性位置的干涉式可读光学编码器包括可沿线性方向移动并具有数据存储层的光学介质，在该层中限定多个均匀尺寸的扇区。 在平行于线性方向的层中定义线性绝对轨道，并且沿着每个扇区内的绝对轨迹顺序地在层中形成多个绝对标记，每个这样的绝对标记可以通过相干光的干涉反射来代表 二进制1或二进制0，并且每个这样的多个绝对标记定义二进制字。 在平行于线性方向的层中定义线性增量轨迹，并在层中形成一系列增量标记，并沿着第一增量轨迹均匀间隔，每个这样的增量标记可通过相干光的干涉反射检测。 读取扇区中的二进制字以识别该扇区在线性方向上的位置，并指示介质的大致位置。 增量标记改善了近似位置指示，以提供更精确的介质位置。

公开(公告)号：US5336884A

公开(公告)日：1994-08-09

申请号：US907412

申请日：1992-07-01

申请人： Mohsen Khoshnevisan ,  Jeffrey S. Schoenwald ,  Jonathan P. Rode ,  Raymond J. D. Smith ,  Bruce G. Kolloff ,  Steve Beccue

发明人： Mohsen Khoshnevisan ,  Jeffrey S. Schoenwald ,  Jonathan P. Rode ,  Raymond J. D. Smith ,  Bruce G. Kolloff ,  Steve Beccue

IPC分类号： G11B19/20 ,  G01D5/249 ,  G01D5/347 ,  G01D5/34

CPC分类号： G01D5/3473 ,  G01D5/2497

摘要： An optical encoder for sensing angular position includes a rotatable optical medium having a major surface and an axis of rotation perpendicular to the surface, with a plurality of uniformly sized angular sectors defined on the surface. An annular absolute track is defined on the surface concentric with the axis, a plurality of digital bits being formed on the surface in sequence along the absolute track within each sector. Each such bit is optically readable as a binary 1 or a binary 0, with each plurality of bits defining a binary word. A first series of optically detectable incremental marks are evenly spaced around a first incremental track on the surface. The binary word in a sector is optically read to identify the angular position of that sector and indicate the approximate angular position of the medium, while the first series of incremental marks can be optically detected to refine the approximate angular position indication. A source of light illuminates the surface along a fixed radius from the axis, while a digital track detector senses the illumination reflected from the absolute bits and a first incremental track detector senses the illumination reflected from the incremental marks. Signal processing and decoding means convert the output of the absolute track detector into a binary word and interpolate the precise angular position of the medium from the output of the first incremental track detector. An input absolute track optical fiber is connected between a absolute track optical coupler and proximate the surface of the medium, while a first input incremental track optical fiber is connected between a first incremental track optical coupler and proximate the surface. Output absolute track and first incremental track optical fibers are connected between the couplers and the track detectors for conveying reflected light from the tracks to the detectors.

摘要翻译： 用于感测角位置的光学编码器包括具有垂直于表面的主表面和旋转轴线的可旋转光学介质，其具有限定在表面上的多个均匀尺寸的角扇区。 在与轴同心的表面上限定环形绝对轨迹，沿着每个扇区内的绝对轨迹顺序地在表面上形成多个数字位。 每个这样的位是光学可读的，作为二进制1或二进制0，每个多个位定义二进制字。 第一系列可光学检测的增量标记围绕表面上的第一增量轨迹均匀间隔开。 扇区中的二进制字被光学读取以识别该扇区的角位置并且指示介质的近似角位置，而可以光学检测第一系列增量标记以改进近似角位置指示。 光源沿着轴的固定半径照亮表面，而数字轨道检测器感测从绝对位反射的照明，第一增量轨迹检测器感测从增量标记反射的照明。 信号处理和解码装置将绝对磁道检测器的输出转换为二进制字，并从第一增量磁道检测器的输出插入介质的精确角位置。 输入绝对轨迹光纤连接在绝对轨道光耦合器和介质表面附近，而第一输入增量轨道光纤连接在第一增量轨道光耦合器和靠近表面之间。 输出绝对轨道和第一增量轨道光纤连接在耦合器和轨道检测器之间，用于将来自轨道的反射光传送到检测器。