JP4258097B2 - Magnetic signal transmission device and rotating magnetic drum device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a magnetic signal transmission device arranged in a rotating magnetic drum device for reproducing a signal on a tape-shaped information recording medium or recording a signal on a tape-shaped information recording medium, and a rotation having the magnetic signal transmission device The present invention relates to a magnetic drum device.
[0002]
[Prior art]
Examples of apparatuses that record information on a magnetic tape and reproduce information on the magnetic tape include a video tape recorder and a tape streamer. This type of information recording apparatus includes a rotating magnetic drum device for recording a signal on a magnetic tape and reproducing a signal on the magnetic tape.
The rotating magnetic drum device is also called a rotating magnetic head device, and has a rotating drum and a fixed drum. For example, the rotating drum has a recording head and a reproducing head. The recording head is a head for recording a signal on a magnetic tape, and the reproducing head is used for reproducing a signal recorded on the magnetic tape.
[0003]
The rotating drum holds the recording head and the reproducing head, and rotates by rotating the motor with respect to the fixed drum, so that the recording head or the reproducing head is scanned with respect to the magnetic tape by, for example, a helical scan method. Information can be recorded on the tape and information on the magnetic tape can be reproduced. By adopting such a helical scan method, high-density recording of signals on a magnetic tape is possible.
In this type of rotating magnetic drum device, signal transmission between the rotating drum and the fixed drum is performed in a non-contact manner by magnetic coupling using a so-called rotary transformer which is a kind of magnetic signal transmitting device.
[0004]
[Problems to be solved by the invention]
By the way, there is a demand for a larger capacity and a higher transfer rate in the rotating magnetic drum device, and in order to meet this demand, the frequency of signals transmitted between the rotating drum and the magnetic drum will further increase in the future. is expected.
However, in the rotary transformer, resonance occurs between the inductance of the rotary transformer itself and the capacitance of the signal processing circuit provided at the end of the rotary transformer (input capacity of an integrated circuit (IC), etc.). It cannot be transmitted, and cannot meet the demand for higher capacity and higher transfer rate required in the market. Therefore, a magnetic signal transmission device such as a rotary transformer that can cope with such a large signal capacity and a high transfer rate is required.
SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a magnetic signal transmission device and a rotating magnetic drum device that can solve the above-described problems and can increase the signal capacity and transfer rate.
[0005]
[Means for Solving the Problems]
The invention of claim 1 is a magnetic signal transmission device arranged in a rotating magnetic drum device for reproducing a signal of a tape-shaped information recording medium or recording a signal on a tape-shaped information recording medium. A rotation transmission unit disposed on the rotating body of the device, and a fixed transmission unit disposed on the stationary body of the rotating magnetic drum device so as to face the rotation transmission unit. And a first magnetic field detection element for detecting a magnetic field, and the fixed transmission part generates a magnetic field and transmits it to the first magnetic field detection element of the rotation transmission part. And a magnetic field generated by the ring-shaped second coil disposed to face the first magnetic field detection element and the first coil of the rotation transmission unit. Together with the first coil. A second magnetic field detection element is provided. And the first magnetic field detecting element is , The second magnetic field detecting element is embedded and attached to the rotation transmission unit. , The magnetic signal transmission device is embedded in a fixed transmission unit.
[0006]
According to a first aspect of the present invention, the rotation transmission unit disposed in the rotating body of the rotary magnetic drum device includes a first coil that generates a magnetic field and transmits the magnetic field to the fixed transmission unit, and a first magnetic field detection element that detects the magnetic field. Yes. The fixed transmission unit disposed in the fixed body of the rotating magnetic drum device includes a second coil that generates a magnetic field and transmits the magnetic field to the first magnetic field detection element of the rotation transmission unit, and a magnetic field generated by the first coil of the rotation transmission unit. A second magnetic field detection element for detection is provided.
Thereby, unlike the prior art, signal transmission between the rotation transmission unit and the fixed transmission unit is not signal transmission by magnetic coupling of a transformer using coils, and thus transmission up to a high frequency band is possible. In addition, since the signal transmission between the rotation transmission unit and the fixed transmission unit is not a signal transmission of the magnetic coupling of the transformer between the coils, it is possible to transmit a DC signal (direct current signal) that does not change the magnetic field. Therefore, it is possible to increase the capacity and transfer rate of signal transmission between the rotary transmission unit and the fixed transmission unit.
Further, the first magnetic field detection element is connected to the fixed transmission unit. In The second magnetic field detecting element is embedded in the rotation transmission unit In Embedded. As a result, the magnetic paths of the fixed transmission unit and the rotary transmission unit are not saturated.
[0007]
According to a second aspect of the present invention, in the magnetic signal transmission device according to the first aspect, the first coil and the first magnetic field detection element of the rotation transmission unit are disposed in a disk-shaped core, and the first magnetic field detection The element is a Hall element or a magnetoresistive element.
According to a second aspect of the present invention, the first coil and the first magnetic field detection element of the rotation transmission unit are arranged in a disk-shaped core, and the first magnetic field detection element is a Hall element or a magnetoresistive element.
[0008]
According to a third aspect of the present invention, in the magnetic signal transmission device according to the first aspect, the second coil and the second magnetic field detection element of the fixed transmission unit are arranged in a disk-shaped core, and the second magnetic field detection The element is a Hall element or a magnetoresistive element.
According to a third aspect of the present invention, the second coil and the second magnetic field detecting element of the fixed transmission unit are disposed in a disk-shaped core, and the second magnetic field detecting element is a Hall element or a magnetoresistive element.
[0009]
According to a fourth aspect of the present invention, in the magnetic signal transmission device according to the first aspect, a reproduction signal of a reproducing head for reproducing a signal of the tape-shaped information recording medium is supplied to the first coil.
According to a fourth aspect of the present invention, the reproduction signal of the reproducing head for reproducing the signal of the tape-shaped information recording medium is supplied to the first coil.
[0010]
According to a fifth aspect of the present invention, in the magnetic signal transmission device according to the first aspect, a recording signal for recording a signal on the tape-shaped information recording medium is supplied to the second coil.
According to another aspect of the present invention, a recording signal for recording a signal on a tape-shaped information recording medium is supplied to the second coil.
[0011]
The invention according to claim 6 is a rotating magnetic drum device for reproducing a signal of a tape-shaped information recording medium or recording a signal on a tape-shaped information recording medium, the rotating body rotating relative to the fixed body. A reproducing head for reproducing a signal of a tape-shaped information recording medium, or a rotating body having a reproducing head and a recording head for recording a signal on a tape-shaped information recording medium, and a fixed body and a rotating body A magnetic signal transmission device for exchanging magnetic signals in a non-contact manner, and the magnetic signal transmission device is disposed so as to face the rotation transmission unit and the rotation transmission unit arranged in the rotating body The rotation transmission unit includes a ring-shaped first coil that generates a magnetic field and transmits the magnetic field to the fixed transmission unit side, and a first magnetic field detection element that detects the magnetic field. The fixed transmission unit is equipped with a rotating transmission unit that generates a magnetic field. Detecting a second coil ring-shaped, which is opposed to the first magnetic field detection element and conveyed to the first magnetic field detection element, the magnetic field generated by the first coil of the rotation transmitting portion Together with the first coil. A second magnetic field detection element is provided. The first magnetic field detection element is embedded and attached to the rotary transmission unit, and the second magnetic field detection element is embedded and attached to the fixed transmission unit. Device.
[0012]
According to a sixth aspect of the present invention, the rotation transmission unit disposed on the rotating body of the rotary magnetic drum device includes a first coil that generates a magnetic field and transmits the magnetic field to the fixed transmission unit, and a first magnetic field detection element that detects the magnetic field. Yes. The fixed transmission unit disposed in the fixed body of the rotating magnetic drum device includes a second coil that generates a magnetic field and transmits the magnetic field to the first magnetic field detection element of the rotation transmission unit, and a magnetic field generated by the first coil of the rotation transmission unit. A second magnetic field detection element for detection is provided.
Thereby, unlike the prior art, signal transmission between the rotation transmission unit and the fixed transmission unit is not signal transmission by magnetic coupling of a transformer using coils, and thus transmission up to a high frequency band is possible. In addition, since the signal transmission between the rotation transmission unit and the fixed transmission unit is not a signal transmission of the magnetic coupling of the transformer between the coils, it is possible to transmit a DC signal (direct current signal) that does not change the magnetic field. Therefore, it is possible to increase the capacity and transfer rate of signal transmission between the rotary transmission unit and the fixed transmission unit.
Further, the first magnetic field detection element is connected to the fixed transmission unit. In The second magnetic field detecting element is embedded in the rotation transmission unit In Embedded. As a result, the magnetic paths of the fixed transmission unit and the rotary transmission unit are not saturated.
[0013]
According to a seventh aspect of the present invention, in the rotary magnetic drum device having the magnetic signal transmission device according to the sixth aspect, the first coil and the first magnetic field detection element of the rotation transmission unit are disposed in a disk-shaped core. The first magnetic field detecting element is a Hall element or a magnetoresistive element.
According to a seventh aspect of the present invention, the first coil and the first magnetic field detecting element of the rotation transmission unit are arranged in a disk-shaped core, and the first magnetic field detecting element is a Hall element or a magnetoresistive element.
[0014]
According to an eighth aspect of the present invention, in the rotary magnetic drum device having the magnetic signal transmission device according to the sixth aspect, the second coil and the second magnetic field detection element of the fixed transmission unit are disposed in a disk-shaped core. The second magnetic field detecting element is a Hall element or a magnetoresistive element.
According to an eighth aspect of the present invention, the second coil and the second magnetic field detection element of the fixed transmission unit are disposed in a disk-shaped core, and the second magnetic field detection element is a Hall element or a magnetoresistive element.
[0015]
According to a ninth aspect of the present invention, in the rotating magnetic drum apparatus having the magnetic signal transmission device according to the sixth aspect, a reproduction signal of a reproducing head for reproducing a signal of the tape-shaped information recording medium is provided on the first coil. Supplied.
According to a ninth aspect of the present invention, the reproduction signal of the reproducing head for reproducing the signal of the tape-shaped information recording medium is supplied to the first coil.
[0016]
According to a tenth aspect of the present invention, in the rotary magnetic drum device having the magnetic signal transmission device according to the sixth aspect, a recording signal for recording a signal on the tape-shaped information recording medium is supplied to the second coil. Is done.
[0017]
The invention of claim 11 is a magnetic signal transmission device arranged in a rotating magnetic drum device for reproducing a signal of a tape-like information recording medium, and a rotation transmission unit arranged in a rotating body of the rotating magnetic drum device; A stationary transmission unit disposed on a stationary body of the rotating magnetic drum device so as to face the rotational transmission unit, and the rotational transmission unit generates a magnetic field and transmits the magnetic field to the stationary transmission unit side. The fixed transmission unit detects the magnetic field generated by the coil of the rotary transmission unit. Along with the coil A magnetic field detection element is provided. And the magnetic field detection element is , The magnetic signal transmission device is embedded in a fixed transmission unit.
[0018]
According to an eleventh aspect, the rotation transmission unit has a coil that generates a magnetic field and transmits the magnetic field to the fixed transmission unit side, and the fixed transmission unit includes a magnetic field detection element that detects a magnetic field generated by the coil of the rotation transmission unit.
Thereby, when reproducing the signal of the tape-shaped information recording medium, the signal of the reproducing head can be generated by the coil and transmitted to the magnetic field detecting element side of the fixed transmission unit in a non-contact manner by magnetic coupling.
As a result, unlike conventional transmissions, signal transmission is not performed by magnetic coupling of transformers between coils, so that signal transmission is possible up to a high frequency band as long as there is a current capability to flow through the coil on the rotary transmission unit side, and the magnetism between the coils Since it is not signal transmission by coupling, it is possible to transmit a DC signal in which the magnetic field does not change. Therefore, it is possible to cope with an increase in capacity and a transfer rate in signal transmission. In addition, since there is no coil on the fixed transmission unit side that is the receiving side, there is no inductance, so when there is an amplifier on the receiving side, the input capacity of the amplifier can be increased, and input noise can be reduced. .
Furthermore, the magnetic field detection element is connected to the fixed transmission unit. In Embedded. As a result, the magnetic path of the fixed transmission unit is not saturated.
[0019]
According to a twelfth aspect of the present invention, in the magnetic signal transmission device according to the eleventh aspect, the coil of the rotation transmission unit is disposed on a disk-shaped core, and the magnetic field detection element of the fixed transmission unit is a disk-shaped core. Arranged in the core, the magnetic field detecting element is a Hall element or a magnetoresistive element.
[0020]
According to a thirteenth aspect of the present invention, in the magnetic signal transmission device according to the eleventh aspect, a reproduction signal of a reproduction head for reproducing a signal of the tape-shaped information recording medium is supplied to the coil.
[0021]
DETAILED DESCRIPTION OF THE INVENTION
DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, preferred embodiments of the invention will be described in detail with reference to the accompanying drawings.
The embodiment described below is a preferred specific example of the present invention, and thus various technically preferable limitations are given. However, the scope of the present invention is particularly limited in the following description. Unless otherwise stated, the present invention is not limited to these forms.
[0022]
FIG. 1 shows a preferred embodiment of the rotating magnetic drum apparatus of the present invention. FIG. 2 shows an example of a cross-sectional structure of the rotating magnetic drum device 10 of FIG.
The rotating magnetic drum device 10 of FIGS. 1 and 2 is also called a rotating magnetic head device, a rotating magnetic reproducing device, or a rotating magnetic recording / reproducing device, and is applied to, for example, a video tape recorder, a data streamer, a digital audio system, etc. Is used for recording a signal on a magnetic tape TP, which is an information recording medium, and reproducing a signal recorded on the magnetic tape TP.
The rotating magnetic drum device 10 has one or more reproducing heads 20 for reproducing signals recorded on the magnetic tape TP. In addition to the magnetoresistive element head 20, the rotating magnetic drum device 10 has a magnetic tape TP. It also has one or more recording heads 21 for recording signals.
[0023]
The rotating magnetic drum device 10 in FIG. 2 includes a fixed drum 1, a rotating drum 2, a rotary transformer 3, and a motor M.
The head 20 and the recording head 21 are mounted on the rotary drum 2. The fixed drum 1 is a fixed body, and the rotating drum 2 is a rotating body. The rotating drum 2 is also called an upper drum, and the fixed drum 1 is also called a lower drum. The rotary transformer 3 is a power rotary transformer, for example, and is a so-called non-contact type magnetic signal transmission device.
As shown in FIG. 1, the magnetic tape TP enters from the tape traveling direction IN (inlet side), is guided along the lead guide portion 3 of the fixed drum 1, and then exits along the tape traveling direction OUT. It has become.
[0024]
First, the fixed drum 1 will be described.
The fixed drum 1 shown in FIG. 2 has a main body 1A, a stator core 3A, and a cylindrical portion 30. Two sets of bearings 32 and 34 are provided in the cylindrical portion 30. A spring 36 is disposed between the bearings 32 and 34. Balls 32A and 34A of the bearings 32 and 34 support the shaft 38 in a rotatable manner. A stator core 3 </ b> A of the rotary transformer 3 is fixed to the inner bottom surface of the fixed drum 1.
[0025]
Next, the rotating drum 2 will be described.
The rotating drum 2 shown in FIG. 2 includes a main body 2A, a circuit board 40, a reproducing head 20, a recording head 21, and the like.
Similar to the main body 1A of the fixed drum 1, the main body 2A of the rotating drum 2 is made of a material such as aluminum.
The head 20 is a reproducing head, and one or a plurality of heads 20 are arranged at a predetermined angle with respect to the rotating drum 2.
As the head 20, for example, a magnetoresistive element type reproducing head (MR head) can be adopted.
[0026]
This reproducing magnetoresistive element head always requires a bias current when a reproduction signal is obtained, and the magnetoresistive element head is a head that causes a change in resistance when the magnetic field changes. The change can be converted into a resistance change and extracted as a change in the reproduction output signal. The magnetoresistive element head is effective as a reproducing head because it obtains a high and stable reproducing output signal without depending on the speed of the magnetic tape.
[0027]
A circuit board 40 is fixed to the upper part of the main body 2 </ b> A of the rotary drum 2. A rotor core 3B of the rotary transformer 3 is fixed to the lower part of the main body 2A. The rotor core 3B is disposed to face the stator core 3A with a predetermined gap.
The rotary drum 2 is fixed to the upper portion of the shaft 38 by press-fitting, for example.
[0028]
Next, the motor M will be described.
The motor M has a rotor 70 and a stator 80. A housing 71 of the rotor 70 is held by a mounting portion 72. The housing 71 is ring-shaped or disc-shaped, and a ring-shaped magnet 73 is fixed inside the housing 71. The magnet 73 is obtained by alternately magnetizing S poles and N poles. The mounting portion 72 is fixed to the lower portion of the shaft 38 by press fitting.
[0029]
The stator 80 has a stator substrate 82, a coil 84, and an iron core 86.
By energizing the coil 84 in a predetermined pattern through the stator substrate 82, the rotor 70 continuously rotates with respect to the stator 80 by the magnetic action of the magnet 73 for driving the rotor 70 and the coil 84. When the rotor 70 is continuously rotated, the rotating drum 2 is continuously rotated about the shaft 38 with respect to the fixed drum 1 via the shaft 38.
When the rotating drum 2 is continuously rotated, the recording head 21 in FIG. 1 records information on the magnetic tape TP fed obliquely by a helical scan method. The reproducing head 20 can reproduce information recorded on the magnetic tape TP.
[0030]
Next, the rotary transformer 3 in FIG. 2 will be described.
The rotary transformer 3 is a non-contact type magnetic signal transmission device. As described above, the stator core 3A of the rotary transformer 3 is fixed to the fixed drum 1 side, and the rotor core 3B is fixed to the rotating drum 2 side. In the embodiment of FIG. 2, the stator core 3 </ b> A and the rotor core 3 </ b> B are disk-shaped cores made of a magnetically permeable material such as ferrite. The stator core 3A and the rotor core 3B face each other at a predetermined interval, and transmit signals by non-contact magnetic induction.
[0031]
3 shows an example of an electrical connection configuration of the rotary transformer 3, FIG. 4 shows an example of a sectional structure of the rotary transformer 3, FIG. 5 is a plan view of a rotor core 3B of the rotary transformer 3, and FIG. These are plan views of the stator core 3A.
[0032]
As shown in FIGS. 5 and 6, the rotor core 3 </ b> B and the stator core 3 </ b> A are disk-shaped cores having the same diameter. A hole 300 is formed in the center of the rotor core 3B, and a hole 310 is also formed in the center of the stator core 3A. 5 and 6, coils (also referred to as windings) 320 and 324 are formed on the surface 304 of the rotor core 3B. Coils 320 and 324 correspond to first coils, generate magnetic fields separately, and send magnetic signals to magnetic field detection elements 420 and 424 of stator core 3A in FIG.
One magnetic field detection element 330 is disposed between the coil 320 and the coil 324. The magnetic field detection element 330 corresponds to a first magnetic field detection element. The coil 320 and the coil 324 are formed concentrically on the surface 304 of the rotor core 3B, and the magnetic field detection element 330 is disposed therebetween.
[0033]
On the other hand, one coil 440 is formed on the surface 404 of the stator core 3A in FIG. The coil 440 corresponds to a second coil, and the coil 440 generates a magnetic field and sends a magnetic signal to the magnetic field detection element 330 in FIG. Magnetic field detection elements 420 and 424 are arranged inside and outside the coil 440, respectively. The magnetic field detection elements 420 and 424 correspond to second magnetic field detection elements.
[0034]
As shown in FIG. 4, the signal transmission coils 320 and 324 on the rotor core 3B side are at positions facing the magnetic field detection elements 420 and 424 of the stator core 3A. The coil 440 of the stator core 3A is in a position corresponding to the magnetic field detection element 330 of the rotor core 3B.
In FIG. 4, the magnetic field 360 between the coil 320 and the magnetic field detection element 420 is indicated by an arrow. Similarly, a magnetic field 364 between the coil 440 and the magnetic field detection element 330 is indicated by an arrow, and a magnetic field 366 between the coil 324 and the magnetic field detection element 424 is indicated by an arrow.
[0035]
The magnetic field 360 is generated when a current flows through the coil 320. The magnetic field 364 is generated when a current flows through the coil 440. The magnetic field 366 is generated when a current flows through the coil 324.
Referring to FIG. 3, as an example, two reproducing heads 20 are arranged on the rotary drum 2, and one recording head 21 is also arranged.
[0036]
The rotating drum 2 includes a reproducing head 20, a recording head 21, head amplifiers 500 and 510, and a VI converter (voltage-current converter) 600. The fixed drum 1 is provided with amplifiers 700 and 750.
In the rotary drum 2, the reproducing head 20 is connected to a coil 320 via a head amplifier 500 and a VI converter 600. As a result, when the reproducing head 20 reproduces a magnetic signal from the magnetic tape, the reproduced signal is amplified by the head amplifier 500 and then converted from a voltage value to a current value by the VI converter 600 to produce a coil. 320 is supplied.
[0037]
The recording head 21 is connected to the magnetic field detection element 330 via a head amplifier 510. Based on the magnetic signal detected by the magnetic field detection element 330 when the magnetic field of the coil 440 is sent, the head amplifier 510 can record a signal on the magnetic tape by the recording head 21.
The magnetic signal detected by the magnetic field detection element 420 of the fixed drum 1 is a current and is amplified by the amplifier 700 and then sent as a reproduction signal to the control unit 100.
The control unit 100 sends a recording signal to the amplifier 750, and the amplifier 750 amplifies the recording current signal and supplies it to the coil 440. As a result, a magnetic field generated when a recording signal current flows through the coil 440 is applied to the magnetic field detection element 330, so that the magnetic field detection element 330 can detect the magnetic signal.
As the magnetic field detection elements 330, 420, and 424, for example, a Hall element or a magnetoresistive element can be used.
The magnetoresistive element causes a change in resistance when the magnetic field changes, and can convert a change in signal magnetic field (input signal) into a resistance change and take it out as a change in output signal.
[0038]
As shown in FIGS. 4 to 6, the magnetic field detection element 330 of the rotor core 3 </ b> B has the rotor core 3 </ b> B so that the magnetic path is not easily saturated. In Embedded. Similarly, in the stator core 3A, the magnetic field detection elements 420 and 424 are provided in the stator core 3A so that the magnetic path is not easily saturated. In Embedded.
[0039]
Next, an example of transmission of a reproduction signal or transmission of a recording signal in a rotary magnetic drum apparatus using the rotary transformer 3 which is the above-described magnetic signal transmission apparatus will be described.
The motor M shown in FIGS. 1 and 2 operates, and the rotating drum 2 continuously rotates along the rotation direction R of FIG. 1 with respect to the fixed drum 1 to reproduce, for example, a signal recorded on the magnetic tape TP. When doing so, the reproducing head 20 reproduces the signal recorded on the magnetic tape TP. In this case, the reproducing head 20 shown in FIG. 3 detects the signal on the magnetic tape TP, amplifies it by the head amplifier 500, converts the voltage into a current signal by the VI converter 600, and then the coil 320. And a current is passed through the coil 324. When current flows through the coils 320 and 324 in this way, magnetic fields 360 and 366 are formed as shown in FIG. The magnetic fields 360 and 366 have a magnitude proportional to the magnitude of the current flowing through the coils 320 and 324. The generated magnetic fields 360 and 366 generate a magnetic path as indicated by an arrow between the rotor core 3B and the stator core 3A through a gap (gap) G in FIG. Therefore, the magnetic field detection elements 420 and 424 of the stator core 3A detect the magnetic fields 360 and 366, respectively, and amplify them by the amplifier 700 shown in FIG.
In this way, the reproduction signal of the reproduction head 20 can be magnetically transmitted from the rotary drum 2 to the fixed drum 1 in a non-contact manner.
[0040]
Further, when the motor shown in FIGS. 1 and 2 is operated and the rotary drum 2 continuously rotates along the rotation direction R, and a new signal is recorded on the magnetic tape TP by the recording head 21. 3 supplies a recording signal to the amplifier 750, and the amplifier 750 amplifies the recording signal and passes a current through the coil 440. As a result, a magnetic field 364 is formed around the coil 440 shown in FIG. 4 to generate a magnetic path.
The magnetic field detection element 330 supplies a recording signal to the recording head 21 by detecting the magnetic field 364 passing through the magnetic path and amplifying it by the head amplifier 510 shown in FIG. The recording head 21 newly records a signal on the magnetic tape TP based on the recording signal. In this way, a recording signal can be transmitted from the fixed drum 1 to the rotating drum 2 in a non-contact manner.
[0041]
In the case of reproducing a signal with the reproducing head 20 in FIG. 3 or when recording a signal with the recording head 21, non-contact magnetic signal transmission is performed by a combination of a coil and a magnetic field detecting element unlike the conventional case. It can be carried out.
Therefore, since it is not the conventional signal transmission by the magnetic coupling of the transformers between the coils, the signal transmission to the high frequency band is possible as long as the current supply capability to flow through the coils 320, 440, 324 on the transmission side is sufficient.
Further, unlike the prior art, since it is not signal transmission by magnetic coupling of transformers between coils, it is possible to transmit a DC signal (direct current signal) in which the magnetic field does not change.
This makes it possible to respond to the demand for a large capacity and high transfer rate of the magnetic signal transmission device in the rotating magnetic drum device, which is required by the market, and it can respond sufficiently even if the frequency of the transmitted signal increases in the future can do.
[0042]
7-9 show another embodiment of the present invention.
3 to 6, the rotating magnetic drum device can be used for both signal recording and signal reproduction.
On the other hand, the embodiment shown in FIGS. 7 to 9 is a rotating magnetic drum device having a function of only reproducing a signal recorded on a magnetic tape.
Therefore, as shown in FIG. 7, only the reproducing head 20 is mounted on the rotary drum 2, and the recording head 21 is not mounted. Elements corresponding to the recording head 21 are not mounted on the fixed drum 1, but magnetoresistive element heads 420 and 424 and an amplifier 700 corresponding to the reproducing head 20 are mounted.
[0043]
In the rotor core 3B of FIG. 8, the two coils 320 and 324 are formed in a ring shape, but no magnetic field detection element is provided. In the stator core 3A shown in FIG. 9, two magnetic field detecting elements 420 and 424 are mounted, but no coil is mounted. The coil 320 in FIG. 8 and the magnetic field detection element 420 in FIG. 9 are in corresponding positions, and the coil 324 in FIG. 8 and the magnetic field detection element 424 in FIG. 9 are in corresponding positions.
When the rotary transformer 3 for such a reproduction-only rotating magnetic drum device is employed, the magnetic field detection elements 420 and 424 in FIG. 9 are embedded on the surface 404 side of the stator core 3A, and a groove is formed. Absent.
[0044]
In the above-described embodiment, since the magnetic field detecting element is used on the receiving side for receiving the signal, since no coil is used on the receiving side of the rotor core and the stator core, there is no inductance. The input capacitance of the amplifier can be increased and input noise can be reduced.
In the embodiment described above, the rotor core and the stator core of the rotary transformer are both disc-shaped. However, the rotor core and the stator core are not limited to this, and both the rotor core and the stator core have a cylindrical shape and are vertically arranged on concentric circles. The one arranged can also be adopted.
The number of coils and the number of mounted magnetic field detecting elements employed in the illustrated embodiment are not limited to this, and the number of coils or the number of magnetic field detecting elements can be changed depending on the signal transmission capability and design requirements. Of course, the number can be increased or decreased.
[0045]
In signal transmission between the fixed part and the rotating part of the rotating drum, the rotary transformer uses a semiconductor magnetic field detecting element such as a magnetoresistive element (MR element) instead of a coil, so that a transmission band from direct current (DC) to high frequency can be obtained. Can have.
[0046]
【The invention's effect】
As described above, according to the present invention, the signal capacity can be increased and the transfer rate can be increased.
[Brief description of the drawings]
FIG. 1 is a perspective view showing a preferred embodiment of a rotating magnetic drum device of the present invention.
2 is a diagram showing an example of a cross-sectional structure of the rotating magnetic drum device of FIG.
FIG. 3 is a diagram showing an example of electrical connection between a rotating drum and a fixed drum.
FIG. 4 is a diagram showing an example of a cross-sectional structure of a rotor core and a stator core of a rotary transformer.
FIG. 5 is a plan view of a rotor core.
FIG. 6 is a plan view of a stator core.
FIG. 7 is a diagram showing another embodiment of the magnetic signal transmission device of the present invention.
8 is a plan view of a rotor core of the rotary transformer in FIG. 7;
9 is a plan view of a stator core of the rotary transformer in FIG. 7. FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Fixed drum (fixed body), 2 ... Rotary drum (rotary body), 3 ... Rotary transformer (magnetic signal transmission apparatus), 3A ... Stator core (fixed transmission part), 3B ... Rotor core (rotation transmission unit), 10... Rotating magnetic drum device, 20... Reproduction head, 21... Recording head, 320, 324 ... Coil (first coil), 330. Magnetic field detection element (first magnetic field detection element), 420, 424 ... Magnetic field detection element (second magnetic field detection element), 440 ... Coil (second coil), TP ... Magnetic tape (tape-shaped Information recording medium)

Claims (13)

A magnetic signal transmission device arranged in a rotating magnetic drum device for reproducing a signal of a tape-shaped information recording medium or recording a signal on a tape-shaped information recording medium;
A rotation transmission unit disposed on a rotating body of the rotating magnetic drum device;
A fixed transmission unit arranged on a fixed body of the rotary magnetic drum device so as to be arranged facing the rotary transmission unit;
Have
The rotation transmission unit includes a first coil that generates a magnetic field and transmits the magnetic field to the fixed transmission unit side, and a first magnetic field detection element that detects the magnetic field,
The fixed transmission unit generates a magnetic field and transmits the magnetic field to the first magnetic field detection element of the rotation transmission unit, and the ring-shaped second coil disposed to face the first magnetic field detection element, and the rotation transmission A second magnetic field detecting element disposed to face the first coil and detect a magnetic field generated by the first coil
Wherein the first magnetic field detection element is mounted embedded in the rotation transmission portion,
The second magnetic field detection element, a magnetic signal transmitting apparatus characterized by mounted embedded in the fixed transmission portion.   2. The magnetic signal transmission according to claim 1, wherein the first coil and the first magnetic field detection element of the rotation transmission unit are disposed in a disk-shaped core, and the first magnetic field detection element is a Hall element or a magnetoresistive element. apparatus.   2. The magnetic signal transmission according to claim 1, wherein the second coil and the second magnetic field detection element of the fixed transmission unit are disposed in a disk-shaped core, and the second magnetic field detection element is a Hall element or a magnetoresistive element. apparatus.   The magnetic signal transmission device according to claim 1, wherein a reproduction signal of a reproducing head for reproducing a signal of the tape-shaped information recording medium is supplied to the first coil.   The magnetic signal transmission device according to claim 1, wherein a recording signal for recording a signal on the tape-shaped information recording medium is supplied to the second coil. A rotating magnetic drum device for reproducing a signal of a tape-shaped information recording medium or recording a signal on a tape-shaped information recording medium;
A fixed body,
A reproducing head that rotates relative to the fixed body and reproduces a signal of the tape-shaped information recording medium, or a recording head that records a signal on the reproducing head and the tape-shaped information recording medium; A rotating body having
A magnetic signal transmission device for exchanging magnetic signals in a non-contact manner between the fixed body and the rotating body;
Have
The magnetic signal transmission device includes:
A rotation transmission unit disposed on the rotating body;
A fixed transmission unit arranged on the fixed body so as to be arranged facing the rotation transmission unit,
The rotation transmission unit includes a ring-shaped first coil that generates a magnetic field and transmits the magnetic field to the fixed transmission unit, and a first magnetic field detection element that detects the magnetic field,
The fixed transmission unit generates a magnetic field and transmits the magnetic field to the first magnetic field detection element of the rotation transmission unit, and the ring-shaped second coil disposed to face the first magnetic field detection element, and the rotation transmission A second magnetic field detecting element disposed to face the first coil and detect a magnetic field generated by the first coil
Wherein the first magnetic field detection element is mounted embedded in the rotation transmission portion,
The second magnetic field detection element, rotating magnetic drum device having a magnetic signal transmitting apparatus characterized by mounted embedded in the fixed transmission portion.   The magnetic signal transmission according to claim 6, wherein the first coil and the first magnetic field detection element of the rotation transmission unit are disposed in a disk-shaped core, and the first magnetic field detection element is a Hall element or a magnetoresistive element. Rotating magnetic drum device having the device.   The magnetic signal transmission according to claim 6, wherein the second coil and the second magnetic field detection element of the fixed transmission unit are disposed in a disk-shaped core, and the second magnetic field detection element is a Hall element or a magnetoresistive element. Rotating magnetic drum device having the device.   The rotary magnetic drum device having a magnetic signal transmission device according to claim 6, wherein a reproduction signal of a reproducing head for reproducing a signal of the tape-shaped information recording medium is supplied to the first coil.   The rotary magnetic drum device having a magnetic signal transmission device according to claim 6, wherein a recording signal for recording a signal on the tape-shaped information recording medium is supplied to the second coil. A magnetic signal transmission device disposed in a rotating magnetic drum device for reproducing a signal of a tape-shaped information recording medium;
A rotation transmission unit disposed on a rotating body of the rotating magnetic drum device;
A fixed transmission unit arranged on a fixed body of the rotary magnetic drum device so as to be arranged facing the rotary transmission unit;
Have
The rotation transmission unit has a ring-shaped coil that generates a magnetic field and transmits the magnetic field to the fixed transmission unit side,
The fixed transmission unit includes a magnetic field detection element disposed to face the coil while detecting the magnetic field generated by the coil of the rotation transmission unit,
The magnetic signal transmission device, wherein the magnetic field detection element is embedded and attached to the fixed transmission unit.   The coil of the rotation transmission unit is disposed in a disk-shaped core, the magnetic field detection element of the fixed transmission unit is disposed in a disk-shaped core, and the magnetic field detection element is a Hall element or a magnetoresistive element. Item 12. The magnetic signal transmission device according to Item 11.   The magnetic signal transmission device according to claim 11, wherein a reproduction signal of a reproducing head for reproducing a signal of the tape-shaped information recording medium is supplied to the coil.

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