DE844676C - Magnetic sound head - Google Patents
Magnetic sound headInfo
- Publication number
- DE844676C DE844676C DEV73A DEV0000073A DE844676C DE 844676 C DE844676 C DE 844676C DE V73 A DEV73 A DE V73A DE V0000073 A DEV0000073 A DE V0000073A DE 844676 C DE844676 C DE 844676C
- Authority
- DE
- Germany
- Prior art keywords
- sound
- pole
- gap width
- head according
- carrier
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
- 230000008859 change Effects 0.000 claims description 2
- 238000000034 method Methods 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 230000035699 permeability Effects 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 1
- 239000000969 carrier Substances 0.000 description 1
- 239000004927 clay Substances 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 230000005389 magnetism Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000010355 oscillation Effects 0.000 description 1
- 239000010453 quartz Substances 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- 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
- G11B5/187—Structure or manufacture of the surface of the head in physical contact with, or immediately adjacent to the recording medium; Pole pieces; Gap features
-
- 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
- G11B5/02—Recording, reproducing, or erasing methods; Read, write or erase circuits therefor
-
- 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
- G11B5/187—Structure or manufacture of the surface of the head in physical contact with, or immediately adjacent to the recording medium; Pole pieces; Gap features
- G11B5/245—Structure or manufacture of the surface of the head in physical contact with, or immediately adjacent to the recording medium; Pole pieces; Gap features comprising means for controlling the reluctance of the magnetic circuit in a head with single gap, for co-operation with one track
- G11B5/2452—Structure or manufacture of the surface of the head in physical contact with, or immediately adjacent to the recording medium; Pole pieces; Gap features comprising means for controlling the reluctance of the magnetic circuit in a head with single gap, for co-operation with one track where the dimensions of the effective gap are controlled
-
- 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
- G11B5/40—Protective measures on heads, e.g. against excessive temperature
-
- 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
- G11B5/58—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 provision for moving the head for the purpose of maintaining alignment of the head relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Magnetic Heads (AREA)
Description
Magnetischer Tonkopf Die Erfindung betrifft einen magnetischen, vorzugsweise aus zwei Hälften sich aufbauenden, an einer Stoßstelle einen Spalt bildenden Tonkopf zur Aufzeichnung auf magnetisch beeinflußbare Band-oder drahtförmigen Tonträger. bzw. Wiedergabe. Der Spalt hat die Aufgabe, den magnetischen Fluß zu unterbrechen und ihn in die wirksame Schicht des Bandes oder in den Draht eindringen zu lassen. Dieser Vorgang ist abhängig von der magnetischen Potentialdifferenz an den beiden Spaltkanten und von dem Widerstand, den die magnetischen Kraftlinien sowohl im Kopfmaterial als auch in der magnetischem Schicht des Tonträgers finden, d. h. also von der , Permeabilität der magnetischen Schicht des Tonträgers. Da ferner aus bekannten Gründen die Spaltbreite nicht größer sein darf als die kleinste zu übertragende Wellenlänge und die Geschwindigkeit des Tonträgers einen Einfluß auf die übertragung des Magnetismus auf den Tonträger ausübt, ist hiermit eine Menge von Fakforen gegeben, die eine Funktion der Spaltbreite sind. Da, wie erwähnt, die Permeabilität des Tonträgers den magnetischen Widerstand beeinflußt, besteht bei konstanter Spaltbreite keine Möglichkeit, den Magnetkopf an verschiedene Tonträgerqualitäten anzupassen.Magnetic sound head The invention relates to a magnetic, preferably The clay head is made up of two halves and forms a gap at one joint for recording on magnetically influenceable tape or wire-shaped sound carriers. or playback. The job of the gap is to interrupt the magnetic flux and to let it penetrate into the effective layer of the tape or into the wire. This process depends on the magnetic potential difference between the two Gap edges and the resistance created by the magnetic lines of force both in the head material as well as in the magnetic layer of the sound carrier, d. H. so from the Permeability of the magnetic layer of the sound carrier. Because also for known reasons the slit width must not be larger than the smallest wavelength to be transmitted and the speed of the sound carrier has an influence on the transmission of magnetism exercises on the phonogram, a number of fac forums are hereby given, the one Function of the gap width are. Since, as mentioned, the permeability of the sound carrier influences the magnetic resistance, there is none with a constant gap width Possibility to adapt the magnetic head to different sound carrier qualities.
Es ist bereits vorgeschlagen worden, den Spalt des Magnetkopfes veränderbar zu gestalten. Dadurch wird es zwar ermöglicht, den vorhandenen Magnetkopf veränderten Bedingungen, z. B. durch ein verstellbares Glied innerhalb des Luftspaltes, anzupassen. Es bedarf dazu aber immer eines Eingriffes von außen und kann dadurch nicht während ein und desselben Aufnahme- bzw. Wiedergabevorganges durchgeführt werden. Vor allem kann mittels dieser Maßnahmen aus den oben angeführten Gründen der Tonumfang i,icht erweitert werden, d. h. die Spaltbreite wird innerhalb eines Aufnahme- oder Wiedergabevorganges nur für eine bestimmte kleinste Wellenlänge eingestellt werden können.It has already been proposed to change the gap of the magnetic head to design. This makes it possible to modify the existing magnetic head Conditions, e.g. B. by an adjustable member within the air gap to adapt. However, this always requires intervention from the outside and can thereby not performed during one and the same recording or playback process will. Above all, these measures can be used for the reasons given above the pitch range i, ot be expanded, d. H. the gap width is within one Recording or playback process is only set for a certain minimum wavelength can be.
Diese Nachteile werden erfindungsgemäß dadurch beseitigt, daß mindestens ein Pol des Magnetkopfes Ultraschallschwingungen ausführt, die die Spaltbreite veränderlich hält. ' Diese Schwingungen können beispielsweise durch einen Schwingquarz oder eine elektro- oder, magnetostriktive Einrichtung mittelbar oder unmittelbar auf den oder die Pole. des Magnetkopfes übertragen werden, z. B. durch eine -mechanische Kopplung des Ultraschallgebers mit den Schenkeln des Magnetkopfes. Dieser Magnetkopf besteht aus einem Polpaar, das winkelig gekrümmt oder kurven-, förmig ausgebildet sein kann. Ein oder beide Pole sind drehbar gelagert, um die auf sie übertragenen Schwingungen ausführen zu können. Je nach der Lage dieses Drehpunktes und/oder entsprechend der Formgebung der Schenkel schwingt der Pol nur in Richtung der Spaltbreite und,/oder in Richtung auf den Tonträger. So führt dieser beispielsweise bei einer Lagerung in dem Spalt entgegengesetzt der Lage der Pole nur Schwingungen in Richtung Spaltbreite aus. Wird die Lagerung der Pole in größerer Nachbarschaft des Gerätes ausgeführt, so schwingt der die Spaltbreite bestimmende Pol derart, daß sowohl die Spaltbreite geändert wird und gleichzeitig der Pol in Richtung des Tonträgers sich bewegt. Die Schwingungen in Richtung auf den Schallträger dienen in erster Linie dazu, einer guten Kontakt mit dem Tonträger herzustellen, wodurch eine Erweiterung des zu übertragenden Frequenzbereiches vorzugsweise bezüglith seiner höheren Frequenzen erreicht wird. Gleichzeitig wird das bisherige Abschleifen des Magnetkopfes durch den Tonträger verringert.These disadvantages are eliminated according to the invention in that at least one pole of the magnetic head carries out ultrasonic vibrations, which vary the gap width holds. 'These vibrations can, for example, by a quartz oscillator or a electro- or magnetostrictive device directly or indirectly on the or the poles. of the magnetic head, e.g. B. by a mechanical coupling of the ultrasonic transducer with the legs of the magnetic head. This magnetic head consists from a pair of poles, which can be bent at an angle or curve-shaped. One or both poles are rotatably mounted around the vibrations transmitted to them to be able to perform. Depending on the location of this pivot point and / or according to the Shaping the legs, the pole only swings in the direction of the gap width and / or towards the sound carrier. For example, this leads to storage in the gap opposite to the position of the poles only oscillations in the direction of the gap width the end. If the poles are stored in a larger vicinity of the device, so the pole determining the gap width oscillates in such a way that both the gap width is changed and at the same time the pole moves in the direction of the sound carrier. the Vibrations in the direction of the sound carrier serve primarily to a to establish good contact with the sound carrier, thereby expanding what is to be transmitted Frequency range is preferably reached with respect to its higher frequencies. At the same time, the previous grinding off of the magnetic head by the sound carrier is eliminated decreased.
Claims (6)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DEV73A DE844676C (en) | 1949-10-28 | 1949-10-28 | Magnetic sound head |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DEV73A DE844676C (en) | 1949-10-28 | 1949-10-28 | Magnetic sound head |
Publications (1)
Publication Number | Publication Date |
---|---|
DE844676C true DE844676C (en) | 1952-07-24 |
Family
ID=7568905
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DEV73A Expired DE844676C (en) | 1949-10-28 | 1949-10-28 | Magnetic sound head |
Country Status (1)
Country | Link |
---|---|
DE (1) | DE844676C (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2204843A1 (en) * | 1972-10-27 | 1974-05-24 | Philips Nv | |
DE4020353B4 (en) * | 1990-06-27 | 2005-11-24 | Grundig Multimedia B.V. | Method for improving the electromechanical properties of magnetic heads and complete magnetic head arrangements |
-
1949
- 1949-10-28 DE DEV73A patent/DE844676C/en not_active Expired
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2204843A1 (en) * | 1972-10-27 | 1974-05-24 | Philips Nv | |
DE4020353B4 (en) * | 1990-06-27 | 2005-11-24 | Grundig Multimedia B.V. | Method for improving the electromechanical properties of magnetic heads and complete magnetic head arrangements |
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