Abstract: To reduce the influence of an unintended magnetic flux of a permanent magnet on detection accuracy. An absolute encoder (2) includes a magnet provided at a tip end side of any one of a first worm gear portion (11) and a second worm gear portion (22), and an angle sensor configured to detect a rotation angle of the magnet in response to a change in magnetic flux generated from the magnet. In the magnet, a first magnetic pole portion of a first polarity and a second magnetic pole portion of a second polarity different from the first polarity are formed adjacent to each other as viewed from an axial end surface of the magnet. The first magnetic pole portion and the second magnetic pole portion are formed adjacent to each other in a radial direction with a radial center of the magnet as a boundary, and the first magnetic pole portion and the second magnetic pole portion are formed adjacent to each other in an axial direction with an axial center as a boundary.

Abstract: A permanent magnet manufacturing method according to an embodiment includes a heating step of disposing a field magnet part near a to-be-magnetized object, the field magnet part having a plurality of permanent magnets for magnetization arranged at predetermined intervals to apply a magnetization magnetic field to the to-be-magnetized object and heating the to-be-magnetized object to a temperature equal to or higher than the Curie point of the to-be-magnetized object, and a magnetization step of cooling the to-be-magnetized object having reached the temperature equal to or higher than the Curie point to a temperature lower than the Curie point and continuously applying a magnetization magnetic field to the to-be-magnetized object by the field magnet unit, and the permanent magnets for magnetization are isotropic SmCo sintered magnets in a predetermined shape.

Abstract: To reduce the influence of an unintended magnetic flux of a permanent magnet on detection accuracy. An absolute encoder (2) includes a magnet provided at a tip end side of any one of a first worm gear portion (11) and a second worm gear portion (22), and an angle sensor configured to detect a rotation angle of the magnet in response to a change in magnetic flux generated from the magnet. In the magnet, a first magnetic pole portion of a first polarity and a second magnetic pole portion of a second polarity different from the first polarity are formed adjacent to each other as viewed from an axial end surface of the magnet. The first magnetic pole portion and the second magnetic pole portion are formed adjacent to each other in a radial direction with a radial center of the magnet as a boundary, and the first magnetic pole portion and the second magnetic pole portion are formed adjacent to each other in an axial direction with an axial center as a boundary.

Abstract: An absolute encoder preferable in being made compact is provided. The absolute encoder includes a worm gear, a permanent magnet (19) provided on a top end side of the worm gear, and magnetic sensors. In the permanent magnet (19), a given first polar portion (N) among first polar portions each having a first polarity and a given second polar portion (S) among second polar portions each having a second polarity different from the first polarity are formed adjacent to each other, when viewed from an end surface of the permanent magnet (19) in an axial direction thereof. A given first polar portion (N) and a given second polar portion (S) are formed to be adjacent in a radial direction, with a radial middle portion of the permanent magnet (19) that is a boundary. A given first polar portion (N) and a given second polar portion (S) are formed to be adjacent in an axial direction, with an axial middle portion of the permanent magnet (19) that is a boundary.

Abstract: A navigation device includes: a storage unit configured to store map information; a position detecting unit configured to detect a position of a moving body; a controller configured to generate drawing data; and a display unit configured to display the drawing data on a screen, the display unit includes a plurality of backlights. The controller is configured to control the plurality of the backlights such that luminance of a backlight that is arranged to irradiate a second region is lower than luminance of a backlight that is arranged to irradiate a first region. The first region corresponds to a traveling direction of the moving body, the second region is a region other than the first region, and the first region is configured to change according to a scale of the map information displayed on the display unit.