US3639698A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dual-gap magnetic flux responsive heads
Assignee: Sony Corp
•
Filing: 1969-11-12
•
Granted: 1972-02-01
•
Expires: 1989-11-12
Abstract
Abstract In a dual-gap magnetic flux responsive head comprised of a saturable magnetic core with coils thereon and a pair of magnetic yokes forming a loop path for magnetic flux in connection with the core disposed therebetween and having dual gaps defined between one end of the core and the adjacent ends of the yokes; the core includes a first member having a lateral portion or crosspiece at one end from which a plurality of parallel, spacedapart legs integrally extend to receive the coils wound apart from the core, and a second member in the form of a crosspiece joined to the free end portions of the legs after the coils have been mounted on the latter.
Inventors
- 👤 Saburo Uemura
- 👤 Toyohiko Fuse
- 👤 Yoshitaka Hashimoto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 18:40
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/127; G11B5/33; G01; G01D; G01D5/00; G01D5/12; G01D5/14; G01D5/20; G01D5/2006; G01D5/2033; G11B5/265
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
161 words
In a dual-gap magnetic flux responsive head comprising a saturable magnetic core with a plurality of coils thereon and a pair of generally C-shaped magnetic yokes disposed at opposite sides of said core and forming, with said core disposed therebetween, a loop path for magnetic flux, the opposite sides of one end portion of said core and adjacent ends of said yokes being spaced from each other to define dual gaps therebetween; said core including a first member having a latEral portion at one end constituting an end portion of the core and a plurality of parallel, spaced-apart legs extending integrally from said lateral portion and receiving said coils which are prewound apart from said core, and a second core member in the form of a crosspiece formed separate from said first member and joined to free end portions of said legs following the mounting of said coils on the respective legs to constitute the other end portion of the core.
Claim 2
Dependent Claim
161 words
In a dual-gap magnetic flux responsive head comprising a saturable magnetic core with a plurality of coils thereon and a pair of generally C-shaped magnetic yokes disposed at opposite sides of said core and forming, with said core disposed therebetween, a loop path for magnetic flux, the opposite sides of one end portion of said core and adjacent ends of said yokes being spaced from each other to define dual gaps therebetween; said core including a first member having a latEral portion at one end constituting an end portion of the core and a plurality of parallel, spaced-apart legs extending integrally from said lateral portion and receiving said coils which are prewound apart from said core, and a second core member in the form of a crosspiece formed separate from said first member and joined to free end portions of said legs following the mounting of said coils on the respective legs to constitute the other end portion of the core.
Claim 3
Dependent Claim
38 words
A dual-gap magnetic flux responsive head according to claim 1, in which the opposite end portions of said core constituted by said lateral portion of the first member and by said crosspiece are as wide as said yokes.
Claim 4
Dependent Claim
33 words
A dual-gap magnetic flux responsive head according to claim 1, in which at least one of said end portions of said core has a width substantially smaller than the width of said yokes.
Claim 5
Dependent Claim
65 words
A dual-gap magnetic flux responsive head according to claim 1, in which said second core member is secured to edges of said legs at the free ends of the latter and the combined length of said first and second core members, when thus secured, and measured in the direction between said end portions of the core, is equal to the corresponding dimension of said yokes.
Claim 6
Dependent Claim
41 words
A dual-gap magnetic flux responsive head according to claim 1, in which at least said first core member has an extension of said lateral portion projecting between said legs to act as a stop for locating said coils along said legs.
Claim 7
Dependent Claim
67 words
A dual-gap magnetic flux responsive head according to claim 1, in which said first core member has a length in the direction of said legs equal to the corresponding dimension of said yokes, and said second core member includes two parts which extend across, and are secured in facially abutting relation to opposite surfaces of said free end portions of the legs which face toward said yokes.
Claim 8
Dependent Claim
40 words
A dual-gap magnetic flux responsive head according to claim 1, in which magnetic reinforcing strips are secured along oppositely facing surfaces of each of said legs between said lateral portion of the first core member and said second core member.
Claim 9
Dependent Claim
21 words
A dual-gap magnetic flux responsive head according to claim 1, in which nonmagnetic gap spacers are provided in said dual gaps.
Claim 10
Dependent Claim
64 words
A dual-gap magnetic flux responsive head according to claim 8, in which said lateral portion of the first core member has an opening therethrough and said gap spacers and yokes have openings therethrough aligned with said opening of the first core member to constitute a bore for slidably receiving a magnetic rod having periodically alternating magnetization recorded therealong to be detected by the head.
Claim 11
Dependent Claim
51 words
A dual-gap magnetic flux responsive head according to claim 1, in which adjacent surfaces of said lateral portion of the first core member, said gap spacers and said yokes have aligned notches defining a groove extending across the dual gaps in a face of the head constituted by said adjacent surfaces.
Claim 12
Dependent Claim
76 words
A dual-gap magnetic flux responsive head according to claim 10 in combination with a substantially identical head, and in which the two heads are in opposing relation with said face of one head abutting said face of the other head and with said dual gaps and grooves of the heads registering so that the grooves define a bore for slidably receiving a magnetic rod having periodically alternating magnetization recorded therealong to be detected by the heads.
Claim 13
Dependent Claim
63 words
A dual-gap magnetic flux responsive head according to claim 1, in which at least said one end portion of said core has a width substantially less than the width of said yokes at said adjacent ends so that the latter project laterally beyond said one end portion of the core at said dual gaps to shield the core from undesired outside magnetic fluxes.
Claim 14
Dependent Claim
55 words
A dual-gap magnetic flux responsive head according to claim 12, in which shielding plates of magnetic material are attached to the opposite lateral faces of said yokes to eNclose the latter and extend across said dual gaps and across said core between said gaps to further shield the core from said undesired outside magnetic fluxes.
Claim 15
Dependent Claim
39 words
A dual-gap magnetic flux responsive head according to claim 12, in which said yokes have lateral flanks which form sidewalls meeting outside of said core to envelop said core and further shield the latter from said undesired magnetic fluxes.
Claim 16
Dependent Claim
43 words
A dual-gap magnetic flux responsive head according to claim 14, in which nonmagnetic spacers are disposed in said gaps and have angled end portions extending toward each other between said one end portion of the core and said lateral flanks of the yokes.
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) | 1975-01-31 | 1975-08-02 | 1976-02-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-31 | 1979-08-02 | 1980-02-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-31 | 1983-08-02 | 1984-02-01 | $7700.00 | Window Closed / Lapsed |