Title:
MAGNETIZING APPARATUS FOR ROTARY ENCODER
Document Type and Number:
Japanese Patent JPS6491015
Kind Code:
A
Abstract:
PURPOSE:To perform highly accurate magnetization with a simple structure, by providing a judging circuit, which compares the time difference between the rise-up and the fall-down of a magnetizing signal, and providing a minute- angle adjusting mechanism for a moving stage of a magnetizing head. CONSTITUTION:First and second magnetizing heads 1 and 2, which magnetize first and second tracks, are mounted on sliding stages 3 and 4. The sliding stage 4 is fixed to a moving base stage 13. A thin film resistor 18 comprising a ferromagnetic body is provided on another sliding stage so as to monitor magnetizing signals. When a work 5 is magnetized with a reference encoder 14, whether the phase difference between the first and second tracks, i.e., the time difference between the rise-up and the fall-down of the signals, is smaller than the reference time or not is judged with the resistor 18 and a judging circuit. When the time difference is large, the moving base stage 13, on which the magnetizing head 2 is mounted, is displaced by a minute angle. The time difference is made to be within the reference time. Therefore, highly accurate magnetization is performed.
Inventors:
MATSUZAKI TAKASHI
KUBO SHOICHI
KUBO SHOICHI
Application Number:
JP24872187A
Publication Date:
April 10, 1989
Filing Date:
October 01, 1987
Export Citation:
Assignee:
MATSUSHITA ELECTRIC IND CO LTD
International Classes:
G01D5/245; H01F13/00; (IPC1-7): G01D5/245; H01F13/00
Attorney, Agent or Firm:
Akira Kobiji (2 outside)