Patent application number | Description | Published |
20090195241 | Electromagnetic induction type encoder - The invention provides a highly accurate and inexpensive electromagnetic induction type encoder capable of acquiring strong signal intensity with the offset reduced by a short scale coil, and is durable against fluctuations in the yaw direction, which includes a number of scale coils | 08-06-2009 |
20130033257 | ELECTROMAGNETIC INDUCTION TYPE ABSOLUTE POSITION MEASURING ENCODER - An electromagnetic induction type absolute position measuring encoder having two or more rows of scale coils, each of the rows having a scale pitch different from that of another row; a transmitter coil and a receiver coil arranged on a grid that is movable relative to the scale in the measuring direction so as to face the scale coils; and the track is constituted by the scale coils, the transmitter coil and the receiver coil. The encoder is capable of measuring an absolute position of the grid with respect to the scale from a flux change detected at the receiver coil via the scale coils when the transmitter coil is excited, in which at least one loop-shaped additional scale coil is added between the scale coils in at least one of the tracks. | 02-07-2013 |
20130069637 | INDUCTIVE DETECTION ENCODER AND DIGITAL MICROMETER - An inductive detection encoder according to the present invention includes: first and second members which are oppositely disposed so as to relatively move in a measurement direction; a transmitting coil formed in the first member; a magnetic flux coupled body which is formed in the second member and coupled with a magnetic field generated by the transmitting coil; and a receiving coil formed in the first member and having receiving loops. At least one of the transmitting coil and the receiving coil has a specific pattern that impairs the uniformity and periodicity of a pattern; and a dummy pattern formed in a position corresponding to a specific phase relationship of a cycle generated by the track with respect to the specific pattern. | 03-21-2013 |
20140151539 | PHOTOELECTRIC ABSOLUTE ENCODER AND INSTALLATION METHOD THEREFOR - In a photoelectric absolute encoder including a scale having a plurality of tracks with different pitch patterns, and a detector having a light source and light receiving elements including a plurality of light receiving element arrays corresponding to the plurality of tracks, a light receiving element array is additionally arranged at a position in the detector corresponding to a boundary between the track having a pattern with a wide pitch and the track having a pattern with a narrow pitch adjacent to each other in the scale, and displacement of the detector relative to the scale in a lateral direction is detected from a signal amplitude of the added light receiving element array. In this manner, displacement of the detector relative to the scale in the lateral direction can be detected. | 06-05-2014 |