| 摘要 |
It is an object to provide a compact absolute encoder device, which is readily assembled and realizes high resolution. The present invention provides an absolute encoder device (1), including: a permanent magnet (4) including a first magnetic pattern 14 (bipolar) and a second magnetic pattern (16) (multipolar); a first magnetic sensor (5) for detecting a magnetic field of the first magnetic pattern (14); a second magnetic sensor (6) for detecting a magnetic field of the second magnetic pattern (16); and a signal processing circuit (7) for calculating an absolute rotation angle of a rotation shaft (2) based on output signals of the first and second magnetic sensors (5 and 6). The first and second magnetic sensors (5 and 6) and the signal processing circuit (7) are fixed to a single substrate (8). The first magnetic pattern (14) is formed on a plane extending in a direction crossing an axial direction inside the permanent magnet (4), and the second magnetic pattern (16) is formed on an outer peripheral surface of the permanent magnet (4). |
