US3084225A - Device for recording and/or reproducing high-frequency signals, more particularly television signals - Google Patents

Device for recording and/or reproducing high-frequency signals, more particularly television signals Download PDF

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Publication number
US3084225A
US3084225A US802745A US80274559A US3084225A US 3084225 A US3084225 A US 3084225A US 802745 A US802745 A US 802745A US 80274559 A US80274559 A US 80274559A US 3084225 A US3084225 A US 3084225A
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United States
Prior art keywords
wheel
carrier
recording
signals
frequency signals
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Expired - Lifetime
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US802745A
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Backers Franciscus Theodorus
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US Philips Corp
North American Philips Co Inc
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US Philips Corp
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    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
    • G11B5/48—Disposition or mounting of heads or head supports relative to record carriers ; arrangements of heads, e.g. for scanning the record carrier to increase the relative speed
    • G11B5/52—Disposition or mounting of heads or head supports relative to record carriers ; arrangements of heads, e.g. for scanning the record carrier to increase the relative speed with simultaneous movement of head and record carrier, e.g. rotation of head
    • G11B5/53—Disposition or mounting of heads on rotating support
    • G11B5/531—Disposition of more than one recording or reproducing head on support rotating cyclically around an axis
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
    • G11B5/127—Structure or manufacture of heads, e.g. inductive
    • G11B5/17—Construction or disposition of windings
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
    • G11B5/48—Disposition or mounting of heads or head supports relative to record carriers ; arrangements of heads, e.g. for scanning the record carrier to increase the relative speed
    • G11B5/52—Disposition or mounting of heads or head supports relative to record carriers ; arrangements of heads, e.g. for scanning the record carrier to increase the relative speed with simultaneous movement of head and record carrier, e.g. rotation of head
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
    • G11B5/48—Disposition or mounting of heads or head supports relative to record carriers ; arrangements of heads, e.g. for scanning the record carrier to increase the relative speed
    • G11B5/52—Disposition or mounting of heads or head supports relative to record carriers ; arrangements of heads, e.g. for scanning the record carrier to increase the relative speed with simultaneous movement of head and record carrier, e.g. rotation of head
    • G11B5/53—Disposition or mounting of heads on rotating support

Definitions

  • This invention relates to devices for recording and/or reproducing high-frequency signals, more particularly television signals, by means of a fixed current conductor, which has the high-frequency signals derived from it or supplied to it by means of a quick-rotating wheel constituted by pole-pieces and magnetic yokes traversed by the magnetic flux.
  • a fixed current conductor which has the high-frequency signals derived from it or supplied to it by means of a quick-rotating wheel constituted by pole-pieces and magnetic yokes traversed by the magnetic flux.
  • a quick-rotating wheel constituted by pole-pieces and magnetic yokes traversed by the magnetic flux.
  • the device according to the invention is characterized in that the current conductor is passed as a single stretched wire through an aperture provided at the centre of the wheel, the magnetic flux being transmitted between the current conductor and the wheel solely through air.
  • the wheel is arranged on one extremity of a hollow shaft, the other extremity of which is provided with a driving roller (rope pulley) which causes the wheel to rotate, at for example, a speed of 48,000 revolutions/ min.
  • a driving roller rope pulley
  • the magnetic carrier must then be bent by 180 round the wheel.
  • a carrier of smaller Width which in this case is bent round the wheel by a correspondingly smaller angle.
  • the carrier is bent round the wheel locally in a manner known in the art.
  • the wheel In order to cause the wheel to rotate at the high speed mentioned above, it is necessary to use a wheel having a small diameter.
  • the device according to the invention is suitable more particularly for small size magnetic recorders intended for domestic use.
  • FIG. 1 shows a longitudinal section of the device according to the invention.
  • FIG. 2 is an elevation view of the quick-rotating wheel round which a magnetic carrier is bent.
  • FIG. 3 is a perspective view of the manner in which the carrier, which is initially fiat, is gradually bent as it approaches the wheel and,
  • FIG. 4 shows a device which may be used in combination with a flat carrier.
  • reference numeral 1 indicates the quick-rotating wheel according to the invention, which is mounted on a hollow shaft 2.
  • the shaft 2 which is journalled in a bearing block 3, also carries a small rope pulley 4 for driving the shaft at a speed of, for example, 48,000 revolutions per minute.
  • the wheel 1 has a central aperture which adjoins the cavity of the shaft 2. Passed through these cavities is a current conductor 5; the flux traversing the yokes arranged on the Wheel induces a potential difference in the conductor when a television program is reproduced and the flux supplies a potential difference when a television program is recorded.
  • FIG. 2 is an elevation view of the quick-rotating wheel 1 in which three gaps 6 are formed between the polepieces of the various magnetic yokes.
  • the current conductor 5 is arranged in the aperture of the wheel, and bent round the wheel is a magnetic carrier 7 which is moved in a direction at right angles to the plane of drawing.
  • FIG. 3 is a perspective view of the manner in which the flat carrier '7 gradually bends round the device of FIG. 1.
  • the Wheel 1 in this case has two gaps and the magnetic carrier must be bent round the wheel through 3180. If more gaps are formed on the Wheel, the carrier must be bent through a correspondingly smaller angle.
  • FIG. 4 shows a variant of the device of FIG. 1, in which the carirer 7 is moved as a flat carrier along the gaps of the wheel 1.
  • the carrier is bent so that it can be moved along the front surface of the wheel 1.
  • a magnetic head for recording or reproducing high frequency signals comprising a quick-rotating wheel having a flat front surface and containing a plurality of magnetic pole pieces separated by a plurality of gaps, means for rotating said wheel, said wheel having a hollow central aperture and an axis, a guide roller, a magnetic carrier moving around said guide roller and adjacent to said gaps along said fiat front surface in flat position, and a stationary single current conductor passing through said aperture at a substantially right angle to said fiat front surface and along said axis, high frequency signals being supplied to the wheel from said conductor for signal recording, high frequency signals being supplied to the conductor from said wheel during signal reproduction, said conductor being substantially parallel to the portion of said carrier at one side of said roller and substantially perpendicular to the portion of said carrier at the other side of said roller.

Description

Apnl 2, 1963 F. T. BACKERS 3,084,225
DEVICE FOR RECORDING AND/OR REPRODUCING HIGH-FREQUENCY SIGNALS, MORE PARTICULARLY TELEVISION SIGNALS Filed March 30. 1959 FIG.1 Fl 6.2
INVENTOR FRANCISCU 5 TH EODORUS BICKERS United States Patent 3,084,225 DEVICE FGR RECORDWG AND/R REPRODUC- ING HiGl-l-FREQUENQY SEGNALS, MGRE PAR- TICULARLY TELEVHSHGN SEGNALS Franciscus Theodor-us Backers, Eindhoven, Netherlands, assignor to North American Philips Company, lino, New York, N.Y., a corporation of Delaware Filed Mar. 30, 1959, Ser. No. 802,745 Claims priority, application Netherlands Apr. 12, 1958 1 Claim. ((31. l79100.2)
This invention relates to devices for recording and/or reproducing high-frequency signals, more particularly television signals, by means of a fixed current conductor, which has the high-frequency signals derived from it or supplied to it by means of a quick-rotating wheel constituted by pole-pieces and magnetic yokes traversed by the magnetic flux. Such a device is known, for example, from British patent specification No. 760,874. In this device, the magnetic flux coupled to the current conductor is transmitted to the wheel or derived therefrom, through a fixed yoke and an air gap.
The device according to the invention is characterized in that the current conductor is passed as a single stretched wire through an aperture provided at the centre of the wheel, the magnetic flux being transmitted between the current conductor and the wheel solely through air. When comparing the above-mentioned known device with the device according to the invention, in which only air is used as a medium instead of fixed yokes, it appears that the arrangement of the current conductor in the cavity is less critical than the positioning of the fixed yoke along the wheel.
In one practical embodiment of the device according to the invention, the wheel is arranged on one extremity of a hollow shaft, the other extremity of which is provided with a driving roller (rope pulley) which causes the wheel to rotate, at for example, a speed of 48,000 revolutions/ min. For writing about 16,000 lines of a television image per second, of which, for example, in each case '10 lines are on one line of the magnetic record carrier, two rotating gaps on the wheel would be sufiicient. The magnetic carrier must then be bent by 180 round the wheel. When use is made of more than two rotating gaps, it is possible to employ a carrier of smaller Width, which in this case is bent round the wheel by a correspondingly smaller angle. The carrier is bent round the wheel locally in a manner known in the art. In order to cause the wheel to rotate at the high speed mentioned above, it is necessary to use a wheel having a small diameter. In view of this fact, the device according to the invention is suitable more particularly for small size magnetic recorders intended for domestic use.
In order that the invention may be readily carried into effect, several embodiments will now be explained in detail, by way of example, with reference to the accompanying drawing, in which corresponding parts are provided with the same reference numerals.
FIG. 1 shows a longitudinal section of the device according to the invention.
FIG. 2 is an elevation view of the quick-rotating wheel round which a magnetic carrier is bent.
FIG. 3 is a perspective view of the manner in which the carrier, which is initially fiat, is gradually bent as it approaches the wheel and,
FIG. 4 shows a device which may be used in combination with a flat carrier.
Referring to FIG. 1, reference numeral 1 indicates the quick-rotating wheel according to the invention, which is mounted on a hollow shaft 2. The shaft 2 which is journalled in a bearing block 3, also carries a small rope pulley 4 for driving the shaft at a speed of, for example, 48,000 revolutions per minute. The wheel 1 has a central aperture which adjoins the cavity of the shaft 2. Passed through these cavities is a current conductor 5; the flux traversing the yokes arranged on the Wheel induces a potential difference in the conductor when a television program is reproduced and the flux supplies a potential difference when a television program is recorded.
FIG. 2 is an elevation view of the quick-rotating wheel 1 in which three gaps 6 are formed between the polepieces of the various magnetic yokes. The current conductor 5 is arranged in the aperture of the wheel, and bent round the wheel is a magnetic carrier 7 which is moved in a direction at right angles to the plane of drawing.
FIG. 3 is a perspective view of the manner in which the flat carrier '7 gradually bends round the device of FIG. 1. The Wheel 1 in this case has two gaps and the magnetic carrier must be bent round the wheel through 3180. If more gaps are formed on the Wheel, the carrier must be bent through a correspondingly smaller angle. Thus, in the case of FIG. 2, where three gaps are shown, the carrier need be bent round the wheel through only FIG. 4 shows a variant of the device of FIG. 1, in which the carirer 7 is moved as a flat carrier along the gaps of the wheel 1. By means of a guide roller 8, the carrier is bent so that it can be moved along the front surface of the wheel 1.
What is claimed is:
A magnetic head for recording or reproducing high frequency signals comprising a quick-rotating wheel having a flat front surface and containing a plurality of magnetic pole pieces separated by a plurality of gaps, means for rotating said wheel, said wheel having a hollow central aperture and an axis, a guide roller, a magnetic carrier moving around said guide roller and adjacent to said gaps along said fiat front surface in flat position, and a stationary single current conductor passing through said aperture at a substantially right angle to said fiat front surface and along said axis, high frequency signals being supplied to the wheel from said conductor for signal recording, high frequency signals being supplied to the conductor from said wheel during signal reproduction, said conductor being substantially parallel to the portion of said carrier at one side of said roller and substantially perpendicular to the portion of said carrier at the other side of said roller.
References Cited in the file of this patent UNITED STATES PATENTS 2,743,320 Daniels et a1 Apr. 24, 1956 2,835,743 Mufliey May 20, 1958 2,909,616 Marty Oct. 20, 1959 2,985,863 Buslik May 23, 1961 FOREIGN PATENTS 760,874 Great Britain Nov. 7, 1956 1,188,391 France Mar. 19', 1959
US802745A 1958-04-12 1959-03-30 Device for recording and/or reproducing high-frequency signals, more particularly television signals Expired - Lifetime US3084225A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL226773 1958-04-12

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US3084225A true US3084225A (en) 1963-04-02

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US (1) US3084225A (en)
CH (1) CH366067A (en)
DE (1) DE1137071B (en)
FR (1) FR1219936A (en)
GB (1) GB844050A (en)
NL (1) NL110074C (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2408892A1 (en) * 1977-11-09 1979-06-08 Lavrentiev Konstantin ROTARY MAGNETIC HEADS
EP0064765A1 (en) * 1981-05-11 1982-11-17 Kabushiki Kaisha Toshiba Rotary magnetic head

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL299624A (en) * 1962-10-24
NL144807B (en) * 1963-12-31 1975-01-15 Philips Nv PROCESS FOR MANUFACTURE OF A ROTATABLE MAGNETIC HEAD CARRIER AND MAGNETIC HEAD CARRIER, MANUFACTURED ACCORDING TO THE PROCESS.

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2743320A (en) * 1949-12-13 1956-04-24 Sperry Rand Corp Variable area magnetic recording system
GB760874A (en) * 1953-09-02 1956-11-07 Philips Electrical Ind Ltd Improvements in or relating to magnetic recording or reproducing heads
US2835743A (en) * 1956-02-16 1958-05-20 Ibm Magnetic transducer assembly
FR1188391A (en) * 1956-12-21 1959-09-22 Ibm Recording device on magnetic tape
US2909616A (en) * 1953-06-15 1959-10-20 Marty Rene Magnetic talking machine
US2985863A (en) * 1957-12-20 1961-05-23 Ibm Magnetic scanner

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE927999C (en) * 1953-07-01 1955-05-23 Telefunken Gmbh Apparatus for magnetic recording and reproduction of television images
DE1026781B (en) * 1956-12-20 1958-03-27 Telefunken Gmbh Arrangement for magnetic recording and sampling of television signals

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2743320A (en) * 1949-12-13 1956-04-24 Sperry Rand Corp Variable area magnetic recording system
US2909616A (en) * 1953-06-15 1959-10-20 Marty Rene Magnetic talking machine
GB760874A (en) * 1953-09-02 1956-11-07 Philips Electrical Ind Ltd Improvements in or relating to magnetic recording or reproducing heads
US2835743A (en) * 1956-02-16 1958-05-20 Ibm Magnetic transducer assembly
FR1188391A (en) * 1956-12-21 1959-09-22 Ibm Recording device on magnetic tape
US2985863A (en) * 1957-12-20 1961-05-23 Ibm Magnetic scanner

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2408892A1 (en) * 1977-11-09 1979-06-08 Lavrentiev Konstantin ROTARY MAGNETIC HEADS
EP0064765A1 (en) * 1981-05-11 1982-11-17 Kabushiki Kaisha Toshiba Rotary magnetic head

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FR1219936A (en) 1960-05-20
DE1137071B (en) 1962-09-27
NL110074C (en)
CH366067A (en) 1962-12-15
GB844050A (en) 1960-08-10

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