US3763329A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Four-track magnetic head for tape recording devices
Assignee: Individual
•
Filing: 1971-09-30
•
Granted: 1973-10-02
•
Expires: 1991-09-30
Abstract
Abstract A four-track magnetic head for tape recording devices, particularly for cassette tape recording devices, which consists of two mainly identically designed housing parts and in which the housing exhibits inside a centre cross-piece being perpendicular to the magnet gaps and one double-track magnet system is pressed onto the centre cross-piece from each side and in which each double-track magnet system contains two magnet coils which are both wound onto a holder which has two square frames at its ends and in which hook-shaped magnetic sheets are inserted with their base legs in the frames.
Inventors
- 👤 S Linke
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 14:57
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/127; G11B5/29; G11B5/295; G11B5/10; G11B5/105; G11B5/17
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
198 words
A four-track magnetic head for tape recording devices comprising two housing parts adapted to house the magnetic systems for said magnetic head, each of said housing parts having a center cross-piece having two spaced-apart contact surfaces, four magnetic systems each consisting of at least one magnet coil and a plurality of magnetic sheets having at least one angular surface and arranged to form a magnetic circuit interrupted by a gap, means for joining two of said magnetic systems into one magnetic unit and the other two of said magnetic systems into another magnetic unit, at least one shielding sheet positioned between and adjacent to each of said magnetic systems, each of said magnetic units and adjacent at least one shielding sheet forming a double-track magnetic unit, and means joining said housing parts such that they contact each other along a plane which is parallel to the plane of said gap and such that said contact surfaces are perpendicular to the plane of said gap, each of said double-track magnetic units lying flush with one of the contact surfaces of each of said center cross-pieces and on opposite sides of the center cross-pieces of each of said housing parts.
Claim 2
Dependent Claim
198 words
A four-track magnetic head for tape recording devices comprising two housing parts adapted to house the magnetic systems for said magnetic head, each of said housing parts having a center cross-piece having two spaced-apart contact surfaces, four magnetic systems each consisting of at least one magnet coil and a plurality of magnetic sheets having at least one angular surface and arranged to form a magnetic circuit interrupted by a gap, means for joining two of said magnetic systems into one magnetic unit and the other two of said magnetic systems into another magnetic unit, at least one shielding sheet positioned between and adjacent to each of said magnetic systems, each of said magnetic units and adjacent at least one shielding sheet forming a double-track magnetic unit, and means joining said housing parts such that they contact each other along a plane which is parallel to the plane of said gap and such that said contact surfaces are perpendicular to the plane of said gap, each of said double-track magnetic units lying flush with one of the contact surfaces of each of said center cross-pieces and on opposite sides of the center cross-pieces of each of said housing parts.
Claim 3
Dependent Claim
41 words
The magnetic head of claim 1 in which each of said double-track magnetic units comprises a holder on which two magnet coils are wound, said holder comprising two spaced-apart square frames arranged parallel to one another and means connecting said frames.
Claim 4
Dependent Claim
34 words
The magnetic head of claim 2 in which said connecting means comprise two spaced-apart rectangular plates attached at their ends to said frames and in which said holder is formed from injection molded plastic.
Claim 5
Dependent Claim
40 words
The magnetic head of claim 1 in which an opening is formed in each of said housing parts which is perpendicular to said center cross-pieces and which is adapted to receive an auxiliary tool used in assembling said magnetic heAd.
Claim 6
Dependent Claim
42 words
The magnetic head of claim 2 in which said magnetic sheets are hook-shaped and have a sloped back portion and an isosceles rectangular triangular opening therein and in which each of said magnetic sheets comprises a base leg and a gap leg.
Claim 7
Dependent Claim
66 words
The magnetic head of claim 5 in which the base legs of said plurality of hook-shaped magnetic sheets of one of said magnetic systems is inserted in one end of said holder and in which the base legs of said plurality of hook-shaped magnetic sheets of another of said magnetic systems is inserted in the other end of said holder to form said double-track magnetic units.
Claim 8
Dependent Claim
27 words
The magnetic head of claim 5 in which said shielding sheets have the same general shape as said hook-shaped magnetic sheets but with said base legs omitted.
Claim 9
Dependent Claim
36 words
The magnetic head of claim 1 in which said center cross-pieces of said housing parts have openings therein and in which a plurality of sheets which function to provide magnetic shielding are inserted in said openings.
Claim 10
Dependent Claim
48 words
The magnetic head of claim 1 in which said center cross-pieces of said housing parts have openings therein and in which a plurality of sheets which function to form a contact to effect the movement of the tape of said tape recording device are inserted in said openings.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-10-01 | 1977-04-02 | 1977-10-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-01 | 1981-04-02 | 1981-10-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-01 | 1985-04-02 | 1985-10-02 | $7700.00 | Window Closed / Lapsed |