US3872507A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rotating air bearing head with shaped control slots
Assignee: Panasonic Holdings Corp
•
Filing: 1973-02-02
•
Granted: 1975-03-18
•
Expires: 1993-02-02
Abstract
Abstract A magnetic recording and reproducing device is disclosed in which one magnetic head or a plurality of magnetic heads are so disposed upon a rotary drum as to extend beyond the outer peripheral surface thereof with the slit gap or gaps in parallel with the axis of rotation of the rotary drum. Recesses are formed on both sides of the magnetic head in the outer peripheral surface of the rotary drum, and the point of the maximum thickness of the magnetic head which is generally similar in cross sectional configuration to an airfoil is located ahead of the midpoint or center of the magnetic head but behind the leading edge thereof. Both side edges of the magnetic head are rounded between the trailing edge and a point very close to the slit gap thereof.
Inventors
- 👤 Kazuhiko Sano
- 👤 Shoji Omiya
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:34
CPC Classifications
G; G11; G11B; G11B15/00; G11B15/60; G11B15/62; G11B15/64; G11B15/61; G11B5/00; G11B5/48; G11B5/52; G11B5/53
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
158 words
A device of the type in which a plurality of magnetic heads are juxtaposed in spaced apart relation in the direction of the axis of rotation of a rotary drum on the outer peripheral surface thereof, and a magnetic tape is wrapped around said rotary drum and is spaced apart therefrom through a thin air layer so that signals may be reecorded on and reproduced from said magnetic tape upon rotation of said rotary drum at high speed, the improvement wherein on both sides of each of said plurality of magnetic heads said outer peripheral surface of said rotary drum is provided with recesses along the length of said magnetic head, the bottom of said recesses being lower than said outer peripheral surface of said rotary drum and the leading edges of said recesses being lower than said outer peripheral surface of said rotary drum, and the bottom of said recesses becoming gradually shallower toward the trailing edges.
Claim 2
Independent Claim
158 words
A device of the type in which a plurality of magnetic heads are juxtaposed in spaced apart relation in the direction of the axis of rotation of a rotary drum on the outer peripheral surface thereof, and a magnetic tape is wrapped around said rotary drum and is spaced apart therefrom through a thin air layer so that signals may be reecorded on and reproduced from said magnetic tape upon rotation of said rotary drum at high speed, the improvement wherein on both sides of each of said plurality of magnetic heads said outer peripheral surface of said rotary drum is provided with recesses along the length of said magnetic head, the bottom of said recesses being lower than said outer peripheral surface of said rotary drum and the leading edges of said recesses being lower than said outer peripheral surface of said rotary drum, and the bottom of said recesses becoming gradually shallower toward the trailing edges.
Claim 3
Dependent Claim
27 words
A device as defined in claim 1, wherein the plurality of magnetic heads are juxtaposed each other between spacers and said recesses being formed on said spacers.
Claim 4
Dependent Claim
43 words
A device as defined in claim 1 where the depth of said recesses gradually increases from the ones located at the outermost sides toward the one located at the center of said plurality of magnetic heads juxtaposed and spaced apart by said recesses.
Claim 5
Dependent Claim
83 words
A device as defined in claim 1 wherein each magnetic head extends out of the peripheral surface of said rotary drum, wherein the point of maximum extension of said magnetic head is located ahead of the midpoint of each magnetic head but behind the leading edge thereof, and the extension of each magnetic head rapidly decreases from said point of the maximum extension toward said leading edge than from said point of the maximum extension toward the trailing edge of said magnetic head.
Claim 6
Dependent Claim
68 words
A device as defined in claim 1 wherein each magnetic head is provided with a slit gap and both side edges of each magnetic head between the leading edge and the point very close to the slit gap thereof are rounded, the curvature of said rounded side edges being gradually reduced from said leading edge toward the point very close to the slit gap of said magnetic head.
Claim 7
Dependent Claim
31 words
A device as defined in claim 1 wherein said recesses are deepest proximate the leading edge and wherein the bottom of said recesses become gradually shallower toward the trailing edge thereof.
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) | 1978-03-17 | 1978-09-16 | 1979-03-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-03-17 | 1982-09-16 | 1983-03-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-03-17 | 1986-09-16 | 1987-03-18 | $7700.00 | Window Closed / Lapsed |