Patent JPS5532428A successfully refreshed from Google Patents.
US4475137A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic transducer
Assignee: Sanyo Electric Co Ltd
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Filing: 1982-03-05
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Granted: 1984-10-02
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Expires: 2002-03-05
Abstract
Abstract A magnetic transducer includes sendust center core having an opening and a head gap extending from the opening to one side of the center core, and a pair of reinforcing cores. Each of the reinforcing cores includes a ferrite plate and a glass member mounted on one side of the ferrite plate. The center core is sandwiched between the two reinforcing cores such that the glass members are located on opposite sides, respectively, of the center core where the head gap is formed, and that one side of the center core is in flush with, or projects from, respective side faces of the glass member. The glass member is formed by a material having an abrasiveness resistivity which is smaller than that of said center core.
Inventors
- 👤 Isao Yasuda
- 👤 Yorinobu Yoshisato
- 👤 Yoshihiko Kawai
- 👤 Kazuaki Koyama
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 14:04
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/127; G11B5/187; G11B5/255; G11B5/1274
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
124 words
A magnetic transducer comprising: a center core made of a material having a large saturation flux density (B s ), said center core having an opening formed therein for winding coil means therethrough and a head gap extending from said opening to one side of said center core; a pair of reinforcing cores each comprising a glass member having an abrasiveness resistivity which is smaller than that of said center core, said pair of reinforcing cores sandwiching said center core such that the glass members are located on opposite sides, respectively, of the center core where said head gap is formed, and that said one side of the center core is in flush with, or projects from, respective side faces of said glass members.
Claim 2
Dependent Claim
124 words
A magnetic transducer comprising: a center core made of a material having a large saturation flux density (B s ), said center core having an opening formed therein for winding coil means therethrough and a head gap extending from said opening to one side of said center core; a pair of reinforcing cores each comprising a glass member having an abrasiveness resistivity which is smaller than that of said center core, said pair of reinforcing cores sandwiching said center core such that the glass members are located on opposite sides, respectively, of the center core where said head gap is formed, and that said one side of the center core is in flush with, or projects from, respective side faces of said glass members.
Claim 3
Dependent Claim
16 words
A magnetic transducer as claimed in claim 1, wherein said center core is made of sendust.
Claim 4
Dependent Claim
75 words
A magnetic transducer as claimed in claim 1, wherein each of said reinforcing core further comprising a plate made of magnetic material, said magnetic plate fixedly connected to said glass member and having a recess formed therein at an intermediate portion of a side which is held in contact with said glass member, said recess defining a window together with said glass member, said window being aligned with said opening for receiving said coil means.
Claim 5
Dependent Claim
32 words
A magnetic transducer as claimed in claim 3, wherein an imaginary line extending from said head gap traverses said window thereby preventing a shortcircuit across the head gap by said magnetic plate.
Claim 6
Dependent Claim
37 words
A magnetic transducer as claimed in claim 3, wherein said glass member includes a projection which engages in said recess formed in said magnetic plate for the rigid connection between the magnetic plate and the glass member.
Claim 7
Dependent Claim
22 words
A magnetic transducer as claimed in claim 3, wherein said connection between said glass member and magnetic plate is an adhesive connection.
Claim 8
Dependent Claim
21 words
A magnetic transducer as claimed in claim 3, wherein said connection between said glass member and magnetic plate is a weld.
Claim 9
Dependent Claim
15 words
A magnetic transducer as claimed in claim 7, wherein said projection is a melt form.
References Cited (Backward Citations)
US4115827A
Cited
US4404608A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-10-02 | 1988-04-02 | 1988-10-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-10-02 | 1992-04-02 | 1992-10-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-10-02 | 1996-04-02 | 1996-10-02 | $7700.00 | Window Closed / Lapsed |