US3673347A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High-frequency recordings device
Assignee: US Philips Corp
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Filing: 1970-06-23
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Granted: 1972-06-27
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Expires: 1990-06-23
Abstract
Abstract An apparatus for recording and/or reproducing video signals on or from a magnetic tape which is helically wound around a cylindrical drum. The drum comprises two axially aligned drum parts which are separated by a gap in which at least one magnetic head rotates during operation. The magnetic head is arranged on an arm which is pivotably mounted on a rotatable disc and which is in a retracted position when the disc is stationary and pivots outwards under the influence of the centrifugal forces when the disc is rotating. The magnetic head is positioned with respect to the tape by means of abutment faces which are provided on the inner surfaces of the drum parts adjacent the gap and cooperate with the pivoting arm. Drum parts and magnetic tape are preferably accommodated in a cassette which is placed on an apparatus which includes the head disc.
Inventors
- 👤 Johannes Joseph M Schoenmakers
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 04:50
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/48; G11B5/52; G11B5/53; G11B15/00; G11B15/60; G11B15/61; G11B15/615
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
242 words
An apparatus for reproducing and/or recording magnetic highfrequency recordings, in particular video signals, on or from a tape-shaped record carrier, comprising a spindle, a support rotatably mounted on said spindle, at least one magnetic head mounted on said support, said magnetic head being arranged for movement with respect to the support as a result of centrifugal forces produced on rotation of the support, biasing means connected to said support for urging said magnetic head in a direction opposite to that urged by the centrifugal forces, an arm for carrying said magnetic head pivotably mounted on the support and arranged for pivotal movement in a plane at right angles to the axis of rotation of the support, a cylindrical drum within which the support is concentrically rotatable, said record carrier being helically wound about said drum, a continuous gap provided in said drum so as to divide it into two parts, said movable magnetic head being arranged for movement through said gap so as to be brought into contact with the record carrier, an abutment face formed by an inner wall portion of aT least one drum part which is adjacent the gap, for limiting the radial outward movement of the arm, a bearing surface provided on one of the drum parts adjacent the gap which forms an abutment face for the outwardly pivoted arm in the axial direction, means for causing the outwardly pivoted arm to abut against the said bearing surface.
Claim 2
Independent Claim
242 words
An apparatus for reproducing and/or recording magnetic highfrequency recordings, in particular video signals, on or from a tape-shaped record carrier, comprising a spindle, a support rotatably mounted on said spindle, at least one magnetic head mounted on said support, said magnetic head being arranged for movement with respect to the support as a result of centrifugal forces produced on rotation of the support, biasing means connected to said support for urging said magnetic head in a direction opposite to that urged by the centrifugal forces, an arm for carrying said magnetic head pivotably mounted on the support and arranged for pivotal movement in a plane at right angles to the axis of rotation of the support, a cylindrical drum within which the support is concentrically rotatable, said record carrier being helically wound about said drum, a continuous gap provided in said drum so as to divide it into two parts, said movable magnetic head being arranged for movement through said gap so as to be brought into contact with the record carrier, an abutment face formed by an inner wall portion of aT least one drum part which is adjacent the gap, for limiting the radial outward movement of the arm, a bearing surface provided on one of the drum parts adjacent the gap which forms an abutment face for the outwardly pivoted arm in the axial direction, means for causing the outwardly pivoted arm to abut against the said bearing surface.
Claim 3
Dependent Claim
65 words
The apparatus as claimed in claim 1, wherein said radial abutment face is formed by an inclined wall portion of one of the drum parts and wherein the axial abutment is formed by the other drum part, whereby an axial component of the centrifugal force thrusts the arm into engagement with the bearing surface when the pivotable arm abuts against the inclined drum wall portion.
Claim 4
Dependent Claim
41 words
The apparatus as claimed in claim 2, further comprising abutment means formed by at least one inclined end face provided on the pivotable arm, the slope of said abutment means being substantially equal to that of the inclined drum wall portion.
Claim 5
Dependent Claim
50 words
The apparatus as claimed in claim 3 wherein the arm is mounted on the support in a V-groove mounting comprising a triangular aperture in one of the said two component parts and a pin of circular cross-section secured to the other component part and projecting into the said triangular aperture.
Claim 6
Dependent Claim
22 words
The apparatus as claimed in claim 1 further comprising means for damping the pivotal movement of the arm relative to the support.
Claim 7
Dependent Claim
76 words
The apparatus as claimed in claim 5, wherein said damping means comprises a leaf spring secured to a pivotable lever mounted on the arm and which exerts a pressure on the arm in a direction substantially at right angles to the direction of displacement of the arm, the support being provided with an abutment for the lever which stops the movement of the lever produced by the centrifugal forces before the arm reaches its maximum displacement.
Claim 8
Dependent Claim
20 words
The apparatus as claimed in claim 6, further comprising butyl rubber interposed between the leaf spring and the pivotable arm.
Claim 9
Dependent Claim
85 words
A cassette suitable for use in an apparatus as claimed in claim 1 comprising at least one tape-shaped record carrier and two co-axially arranged drum parts, which are separated by a gap and around which the record carrier is helically wound, characterized in that one of the drum parts is internally provided with an inclined wall portion adjacent the gap and the other drum part contains a bearing edge situated in a plane at right angles to the common axis of the two drum parts.
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) | 1975-06-27 | 1975-12-27 | 1976-06-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-06-27 | 1979-12-27 | 1980-06-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-06-27 | 1983-12-27 | 1984-06-27 | $7700.00 | Window Closed / Lapsed |