Title:
【発明の名称】回転検出器
Document Type and Number:
Japanese Patent JP2999640
Kind Code:
B2
Abstract:
PURPOSE:To reduce the power consumption of the detector by a method wherein a voltage is applied to a magnetism-reactive element for rotation-direction detection use only when the state of a magnetism-reactive element for rotation detection use is changed. CONSTITUTION:This detector is provided with a shaft 1 to which a permanent magnet 2 is attached, with a magnetism-reactive element 11, for rotation detection use, which is arranged and installed so as to be close to the permanent magnet 2 and with a magnetism-reactive element 21, for rotation-direction detection use, which is arranged and installed in a position whose phase is different from that of the magnetism-reactive element for rotation detection use. The detector detects the rotation of the shaft 1 from a change in the state of the magnetism-reactive element 11, and it detects a rotation direction from a change in the state of the magnetism-reactive element 21 A sampling voltage is applied to the magnetism-reactive element 11 from a power- supply circuit 30, the state of the magnetism-reactive element is monitored, a voltage is applied to the magnetism-reactive element 21 only when the state of the magnetism- reactive element for rotation detection use is changed. When the output of a latch circuit 90 is at a high level (i), it is judged that the shaft is turned forward. When the output is at a low level (j), it is judged that the shaft is turned in the reverse direction.
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Inventors:
Takeshi Iwata
Application Number:
JP31122092A
Publication Date:
January 17, 2000
Filing Date:
October 26, 1992
Export Citation:
Assignee:
Ricoh Elemex Co., Ltd.
International Classes:
G01D5/244; G01F15/075; G01P13/04; G01D5/245; (IPC1-7): G01P13/04; G01D5/245; G01F15/075
Domestic Patent References:
| JP5960320A |
Attorney, Agent or Firm:
Akichika Takano