Method of manufacturing a pair of pole pieces for a magnetic head
Abstract
Abstract A PAIR OF POLE PIECES HAVING A MAGNETIC HEAD WHICH HAVE TIPS OF A MAGNETIC ALLOY WITH A SPACER OF NON-MAGNETIC METAL BETWEEN THE TIP END PORTIONS OF SAID TIPS FOR FORMING A NON-MAGNETIC GAP. THE POLE PIECES ARE FORMED BY GROOVING THE FLAT SURFACES OF TWO MAGNETIC ALLOY BARS, DEPOSITING A NON-MAGNETIC METAL FILM ON THE FLAT TOP SURFACES OF THE BARS AND WETTING THE INSIDE OF THE GROOVES WITH A SOLDERING MATERIAL. THE THUS PREPARED BARS ARE BROUGHT TOGETHER DUE TO THE FLAT SURFACES ABUTTING EACH OTHER AND THEN THE SOLDERING MATERIAL IS HEATED SO AS TO ADJOIN THE ABUTTING BARS. THE THUS JOINED BARS ARE CUT ALONG A PLANE PERPENDICULAR TO THE ABUTTING SURFACES OF THE BARS AND THEN EACH OF THE CUT SURFACES IS CUT ALONG A PLANE PERPENDICULAR IN LONGITUDINAL AXES OF THE PARTS TO PRODUCE A PLURALITY OF PAIRS OF POLE PIECES.
Inventors
- 👤 Yoshio Tawara
- 👤 Yasumasa Komatsu
- 👤 Hozumi Hirota
Bibliographic Details
Claims Analysis
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| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1974-09-19 | 1975-03-21 | 1975-09-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-09-19 | 1979-03-21 | 1979-09-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-09-19 | 1983-03-21 | 1983-09-20 | $7700.00 | Window Closed / Lapsed |