JPH117618A - Rotary magnetic head device - Google Patents

Abstract

(57) [Problem] To reduce the size of a plurality of recording tracks recorded on a tape-shaped information recording medium using a plurality of reproducing heads regardless of the arrangement of the recording tracks on the information recording medium. Provided is a rotary magnetic head device that can be realized. SOLUTION: A rotary drum 2 having a rotating body 30 of a transmission device and a plurality of reproducing heads RH1, RH2, RH3, RH4, a fixed drum 1 having a fixed body 20 of the transmission device,
The reproduction signal R from each of the reproduction heads RH1, RH2, RH3, and RH4 is selected, and each reproduction head RH1, RH2, R
Reproduction signal selection means 200 for sequentially arranging reproduction signals R from H3 and RH4, and reproduction heads RH1, RH2, RH3 and RH4 arranged on the rotating body 30 of the transmission apparatus and transmitted from the reproduction signal selection means 200. And a rotating body reproduction signal wiring portion RR to which the reproduction signal RS is supplied, and a reproduction signal RS
A fixed-body reproduction signal wiring portion RR for receiving contactlessly;
Is provided.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary magnetic head device having a non-contact type transmission device used for an information recording device such as a video tape recorder, and more particularly to a magnetic recording device recorded on a tape-shaped information recording medium. The present invention relates to a rotating magnetic head device capable of reproducing signals of a plurality of recording tracks using a plurality of reproducing heads regardless of the arrangement of recording tracks on an information recording medium.

[0002]

2. Description of the Related Art As a device for recording information on a magnetic tape or reproducing information from a magnetic tape, there are a video tape recorder, a tape streamer and the like. Such a type of information recording apparatus includes a rotary magnetic head device for recording a signal on a magnetic tape and reproducing a signal from the magnetic tape. The rotating magnetic head device has a rotating drum and a fixed drum, and the rotating drum has a recording head and a reproducing head. The recording head is a head for recording a signal on the magnetic tape, and the reproducing head is used for reproducing a signal recorded on the magnetic tape.

The rotating drum holds the recording head and the reproducing head, and rotates the motor with respect to the fixed drum to scan the recording head or the reproducing head against the magnetic tape, for example, by a helical scan method. Thus, information can be recorded on the magnetic tape or the information on the magnetic tape can be reproduced. By employing such a helical scan method, high-density recording of signals on a magnetic tape is possible, and the relative speed between the magnetic tape and the magnetic head can be increased. In the helical scan type rotary magnetic head device, since the recording head and the reproducing head are housed in the rotary drum, it is necessary to exchange signals and power between the rotary drum and the fixed drum in a non-contact manner. . For example, there is a case where a reproduction signal obtained from the reproduction head is transmitted from the rotary drum side to the fixed drum side in a non-contact manner, or a power supply for a circuit board is supplied from the fixed drum side to the rotary drum side.

In recent years, by setting a plurality of reproducing heads on a rotating drum and rotating the plurality of reproducing heads at a high speed, a recording track recorded on a tape-shaped information recording medium is so-called non-recording. Reproduction is performed by a tracking method. The non-tracking reproduction method is as follows.

FIG. 16 shows a tape-shaped information recording medium, for example, a magnetic tape TP such as a video tape. The magnetic tape TP has a high density of recording tracks TC1 to TC1.
TCn are sequentially formed. As shown in FIG. 16A, information is recorded in adjacent TC1 to TCn in + azimuth and -azimuth. In a generally used tracking reproduction method, a plurality of reproduction heads set on a rotating drum of a magnetic head device are used to record each recording track T.
The information of each recording track is reproduced along the scan direction SC along C1 to TCn. However, in recent years, recording tracks have been narrowed to increase the recording density, and the width of each recording track has been reduced. Therefore,
In the case where each reproducing head reproduces information of each recording track by accurately tracing in the scanning direction SC of the recording track by a tracking method as in the related art, the accuracy of the guide of the reproducing head and the reproducing head of the rotating drum are required. Posture errors and the like have a great effect, and it is very difficult to accurately reproduce data by the tracking method.

In view of this, the above-mentioned non-tracking reproduction method has been proposed. For example, as shown in FIG. If the track is not parallel to the track forming direction DD and is inclined, that is, if the trace of the reproducing head when reproducing from the recording track is inclined, the area reproduced by a certain azimuth head is limited. Regardless, this method scans the rotating drum with the number of recording heads, for example, twice the number of recording heads, so that all the recording tracks can be recorded by the adjacent + azimuth reproducing head and -azimuth reproducing head. Can be traced. For example, paying attention to the reproduction trace of a certain recorded track, in the case of performing double-density scanning, where an odd azimuth scan has a small amplitude due to reverse azimuth and cannot be read, a portion of the next even scan is not read. At the same rotation phase, the azimuth is the same, and the information of the recording track can be read without fail. When this is repeated for several scans, the data of one recording track is divided into several times, and as shown in FIG. 16C, each recording section constituting all the data of the recording track, for example, RA1 and RA2. , The information IDs of all the recording tracks can be reproduced. Such a method is a non-tracking reproduction method.

[0007]

However, in order to realize such a non-tracking reproducing method, a plurality of reproducing heads, for example, four reproducing heads are required, and the rotating drum has a number of reproducing heads. With the increase, the number of signal transmission channels of the rotary transformer set in the rotary magnetic head device also increases to four.
Therefore, the size of the rotary drum and the fixed drum of the rotary magnetic head device is inevitably increased, which causes an increase in cost. Therefore, the present invention solves the above-mentioned problems, and a case where signals of a plurality of recording tracks recorded on a tape-shaped information recording medium are reproduced using a plurality of reproducing heads regardless of the arrangement of the recording tracks on the information recording medium. It is another object of the present invention to provide a rotary magnetic head device that can be downsized.

[0008]

SUMMARY OF THE INVENTION According to the present invention, there is provided a tape-shaped information recording apparatus comprising a transmission device for transmitting a power supply and a signal between a rotating body and a fixed body in a non-contact manner. A rotary magnetic head device that reproduces signals of a plurality of recording tracks recorded on a medium using a plurality of reproducing heads regardless of the arrangement of the recording tracks on the information recording medium. A rotating drum having a head, a fixed drum having a fixed body of the transmission device, a playback signal selecting means for selecting a playback signal from each playback head and sequentially arranging the playback signals from each playback head; A rotator reproduction signal wiring section that is arranged and receives a reproduction signal of each reproduction head sent from the reproduction signal selection means, and is disposed on a fixed body and disconnects the reproduction signal from the rotator reproduction signal wiring section. By and a fixed body reproduction signal wiring section for receiving a rotary magnetic head device is achieved.

According to the present invention, when signals of a plurality of recording tracks recorded on a tape-shaped information recording medium are reproduced using a plurality of reproducing heads irrespective of the arrangement of the recording tracks on the information recording medium, reproduction is performed. The signal selecting means selects the reproduction signal from each reproduction head and sequentially arranges the reproduction signals from each reproduction head. Then, the rotating body reproducing signal wiring section transmits the reproducing signal of each reproducing head sent from the reproducing signal selecting means to the fixed body reproducing signal wiring section in a non-contact manner. Thereby, when the rotating drum has a plurality of reproducing heads, and the reproducing signals are obtained from the reproducing heads, the reproducing signal selecting means sequentially arranges the reproducing signals from these reproducing heads and puts them together. Since the state is applied to the rotating body reproduction signal wiring section, the rotating body reproduction signal wiring section and the fixed body reproduction signal wiring section need only be for one channel, for example. Accordingly, the number of channels in the rotary magnetic head device can be greatly reduced, and the rotary magnetic head device can be downsized.

[0010]

Preferred embodiments of the present invention will be described below in detail with reference to the accompanying drawings. Note that the embodiments described below are preferred specific examples of the present invention,
Although various technically preferable limits are given, the scope of the present invention is not limited to these modes unless otherwise specified in the following description.

FIG. 1 shows a preferred embodiment of a rotary magnetic head device provided with a non-contact transmission device of the present invention. FIG. 2 shows an example of an information recording device provided with the rotary magnetic head device 10. The rotating magnetic head device 10 of the information recording apparatus employs a so-called non-tracking reproduction method in which reproduction is performed using a plurality of reproduction heads RH1 to RH4 regardless of the arrangement of recording tracks on a magnetic tape. The rotary magnetic head device 10 shown in FIGS. 1 and 2 is applied to a video tape recorder, a data streamer, a digital audio system, or the like, and records a signal on a magnetic tape TP which is a tape-shaped recording medium, It is used to reproduce information recorded in the TP.

The rotary magnetic head device 10 shown in FIGS.
It has a fixed drum 1, a rotating drum 2, and a motor M. The rotating drum 2 includes, for example, four reproduction heads RH1.
(R +), RH2 (R +), RH3 (R-) and RH4
(R-) and two recording heads WH1 and WH2. Each of the reproducing heads RH1, RH2, RH3, and RH4 has a phase difference of 90 degrees, and the recording heads WH1 and WH2 have a phase difference of 90 degrees.
It has a phase difference of 80 degrees. The rotating drum 2 rotates in the direction of arrow R with respect to the fixed drum 1 by the operation of the motor M. The rotating drum 2, the recording head, and the reproducing head have R
Rotate in the direction. The magnetic tape TP is sent obliquely from the inlet side IN to the outlet side OUT along the tape running direction E along the lead guide portion 3 of the fixed drum 1.

In the information recording apparatus shown in FIG. 2, the magnetic tape TP is brought into close contact with the rotary drum 2 and the fixed drum 1 from the supply reel 4 via the rollers 4a, 4b, 4c by approximately 180 degrees, and the rollers 4d, 4e, 4f, After 4 g, it can be wound on the take-up reel 5. In correspondence with roller 4f,
A capstan 4h is provided, and the capstan 4h is rotated by a capstan motor M1. As a result, when the motor M operates and the rotary drum 2 rotates in the R direction, the recording head and the reproducing head
Is contacted and guided by a helical scan method.
The magnetic tape TP runs obliquely along the lead guide 3 of the fixed drum 1.

FIGS. 3 and 4 show structural examples of the rotary magnetic head device 10. FIG. Rotary magnetic head device 10 shown in FIG.
Has a rotary transformer T which is a non-contact type transmission device, and the rotary transformer T is disposed between the rotary drum 2 and the fixed drum 1. That is, the rotary transformer T is built in the rotary magnetic head device 10. The rotating magnetic head device 10 is also called a rotating drum device, and includes two bearings 1 in a sleeve 1 a of the fixed drum 1.
b is arranged. The fixed drum 1 is fixed with a stator core 20 which is a fixed body of the rotary transformer T.

The rotary drum 2 has a flange 2a, which is fixed to the upper end of the shaft 5 by press-fitting or bonding. The lower end of the shaft 5 is the rotor MR of the motor M.
It is fixed to. The motor M has a rotor MR and a stator MS. For example, a driving magnet 6 is disposed on the rotor MR, and a driving coil 7 is disposed on the stator MS. By energizing the coil 7 in a predetermined pattern, the rotor MR of the motor M rotates continuously. The intermediate portion of the shaft 5 is rotatably supported by bearings 1b, 1b. Inside the flange 2a,
A rotor core 30, which is a rotating body of the rotary transformer T, is fixed.

The rotary transformer T shown in FIG. 3 comprises a stator core 20 (fixed body) and a rotor core 30 (rotary body), each of which is a disc-shaped core as shown in FIG. Made of material. The stator core 20 and the rotor core 30 are formed in a ring shape so that the sleeve 1a in FIG. Signal transmission channels CH1 to CH4 are arranged on the inner surface of stator core 20 (upper surface in FIG. 3) and the inner surface of rotor core 30 (lower surface in FIG. 3) about axis 5, respectively, as described later. Have been. The wiring portions forming these channels CH1 to CH4 can be formed by winding a normal insulated wire in a ring shape, or can employ a printed wiring board. Thus, when the coil 7 of the stator MS of the motor M is energized, the rotor MR of the motor M, the shaft 5, the flange 2a, the rotating drum 2 and the rotor core 30 of the rotary transformer T rotate with respect to the fixed drum 1 and the stator core 20. The rotor core 30 and the stator core 20 are arranged to face each other in a non-contact manner.

On the other hand, the rotary magnetic head device 10 shown in FIG.
A cylindrical stator core 120 as shown in FIG. 6 is fixed to the fixed drum 1. The rotor core 130 of the rotary transformer T1 is fixed to the flange 2a of the rotary drum 2. Stator core 120 and rotor core 13
Numerals 0 are arranged coaxially about the axis 5, and the outer diameter of the stator core 120 is set smaller than the inner diameter of the rotor core 130. Thereby, the stator core 120
And the inner surface of the rotor core 130 are arranged in a non-contact manner with a predetermined gap. The channels CH1 to CH4 of the rotary magnetic head device 10 of FIG. 4 are formed in a ring shape in the axial direction.

When current is applied to the coil 7 of the stator MS of the motor M in a predetermined energizing pattern, the rotor MR of the motor M, the shaft 5, the flange 2a, and the rotor core 130 of the rotary transformer T1 are fixed to the fixed drum 1 and the stator core 120.
And rotates in a non-contact manner at a predetermined interval. The non-contact type transmission device of the present invention can be applied to both a flat-type rotary transformer T as shown in FIGS. 3 and 5 and a cylindrical rotary transformer T1 as shown in FIGS. 4 and 6. It is.

Next, an example of the wiring structure of the rotary transformer T shown in FIGS. 3 and 5 will be described with reference to FIG.
The rotary transformer T shown in FIG.
0 are arranged to face each other, and a predetermined gap CM is set. On the inner surface 21 of the stator core 20, for example, four grooves 21a, 21b, 21c, and 21d are formed coaxially from the inner peripheral side to the outer peripheral side about the central axis CL. Similarly, the grooves 31 a, 31 b, 31 c, and coaxially around the center axis CL are also provided on the inner surface 31 of the rotor core 30.
31d are formed. These grooves 21a to 21d
And the grooves 31a to 31d are at positions facing each other.

A reproduction signal transmission ring RR is disposed in the grooves 21a and 31a, and a recording signal transmission ring WR is disposed in the grooves 21b and 31b. The recording signal transmission ring WR is disposed in the grooves 21c and 31c, and the power transmission ring PR is disposed in the grooves 21d and 31d. Each of the reproduction signal transmission ring RR, the recording signal transmission ring WR, the recording signal transmission ring WR, and the power transmission ring PR is formed by, for example, winding an insulated wire rod a plurality of times in a ring shape. The rotor core 30 and the stator core 20 themselves are made of a magnetically permeable material such as ferrite in a disk shape or a ring shape. The reproduction signal transmission ring RR and the recording signal transmission ring WR are signal transmission systems,
The power transmission ring is a power supply system.

Next, with reference to FIGS. 8 and 9, a description will be given of the rotary transformer T according to the first embodiment of the present invention and its peripheral functional parts. The rotary transformer T shown in FIG.
8 differs from that of the rotary transformer T, and the channels CH1 to CH4 are drawn in the vertical direction in FIG. As shown in FIGS. 8 and 7, the characteristic feature of the rotary transformer T is that the power supply region of the power transmission ring PR, the reproduction signal transmission ring RR and the recording signal transmission ring W
That is, two regions of the R signal region exist separately. The area of the power transmission ring PR and the reproduction signal transmission ring RR are two recording signal transmission rings W
R and WR are separated. The two recording signal transmission rings WR, WR serve as a crosstalk prevention unit of the rotor core 30 and a crosstalk prevention unit of the stator core 20 for preventing crosstalk between the power transmission ring PR and the reproduction signal transmission ring RR. Fulfill.

In FIG. 8, the power transmission ring PR of the stator core 20 in the power transmission ring PR of the channel CH4 is connected to the oscillator 4 via the power drive 40.
1 connected. The high frequency direct current generated by the oscillator 41 is converted into an alternating current, and the power drive 40 gives the alternating current to the power transmission ring PR of the stator core 20. The power transmission ring PR of the stator core 20 is
An AC current is transmitted to R in a non-contact manner, and the transmitted AC current is rectified by the rectifier 42 to become a DC current,
The DC current is set to a desired voltage by the regulator 43a. The current set to the voltage from the regulator 43a is preferably the read head RH1, RH2, RH
3, RH4 reproduction amplifiers 43A, 43B, 43C, 43
D and is used to amplify the read current obtained by the read head RH. Further, the current of the regulator 43a can be supplied to the reproduction signal selection means 200.

The four reproducing heads RH1, RH2, RH3 and RH4 set on the rotating drum are connected to reproducing amplifiers 43A to 43D, respectively, and can supply a reproducing signal RS to each of them. This playback amplifier 43
A to 43D separately amplify the applied reproduction signal RS. These reproduction amplifiers 43A to 43D can supply the reproduction signal transmission ring RR of the rotor core 30 arranged in the channel CH1 of the rotary transformer T. The reproduction signal transmission ring RR can transmit the reproduction signal to the reproduction signal transmission ring RR of the stator core 20 in a non-contact manner. The reproduction amplifiers 43A to 43D are connected to the reproduction signal selection unit 2
00, and the reproduction signal selecting means 200 supplies selection signals S1 to S4 to the respective reproduction amplifiers 43A to 43D.
Can be sent individually. Only the reproduction amplifiers 43A to 43D to which the reproduction signal is given can amplify the reproduction signal RS and send it to the reproduction signal transmission ring RR.

The reproduction signal selection means 200 includes, for example, a magnetic sensor 201, a shaping circuit 202, and a switching means 20.
3 and so on. The magnetic sensor 201 is set on the rotating drum 2 shown in FIG. 1, and the magnet detected by the magnetic sensor is fixed to the fixed drum 1. When the rotating drum 2 rotates with respect to the fixed drum 1, the magnetic sensor 201 detects the magnetism of the magnet of the fixed drum 1 for each rotation, sends a detection signal to the shaping circuit 202, shapes the waveform, and forms a rectangular wave. To the switching means 203. Switching means 203 generates selection signals S1 to S4 based on signal SM. The switching means 203 supplies a selection signal S to the reproduction amplifiers 43A to 43D.
1 to S4, the reproduction amplifier 43
A to 43D are at timings as shown in FIG.
FIG. 8 shows the reproduction signals RS from the reproduction heads RH1 to RH4.
To the reproduction signal transmission ring RR of the rotor core 30 of FIG. The four playback amplifiers 43A to 43D
Since the connection is made and sent to the reproduction signal transmission ring RR of the rotor core 30, the reproduction signals RSA arranged for one channel can be produced as shown in FIG. 9B.

As shown in FIG. 8, the reproducing head RH1
To RH4 each have a predetermined azimuth angle.
That is, the reproducing heads RH1 and RH2 each have a magnetic gap GP having a + azimuth angle θ, and the reproducing heads RH3 and RH4 have a magnetic gap GP having a −azimuth angle θ. Therefore, the reproducing head R shown in FIG.
The reproduction signals RS of H1 and RH2 and the reproduction signals RH3 and RH
The reproduction signal RS of No. 4 reproduces a reverse azimuth recording track. The reproducing head RH1 shown in FIGS.
(R +) and RH2 (R +) indicate that the magnetic gap GP has a + azimuth angle, and the read head RH3
(R−) and RH4 (R−) indicate that they have a −azimuth angle. The magnetic recording head W in FIG.
H1 (W +) indicates that it has a + azimuth angle, and the recording head WH2 (W-) indicates that it has a -azimuth angle.

As described above, in the embodiment of FIG. 8, the rotating drum 2 has a plurality of, for example, four reproducing heads RH1 to RH4.
For example, when the recording track recorded on the magnetic tape is reproduced by the non-tracking reproduction method by scanning at twice the normal density, the reproduction signal RS of each of the reproduction heads RH1 to RH4 is The reproduction signals RSA arranged in time series for one channel as shown in FIG. 9 by the selection signals S1 to S4 of the reproduction signal selection means 200.
Can be formed. Thereby, the reproduction signal transmission rings RR, RR in the rotary transformer T of FIG.
With one channel, the reproduction signal RSA can be sent to the reproduction amplifier 44 of the stator core 20 in a non-contact manner.

The correction circuit 100 shown in FIG. 8 converts the reproduction signal RS amplified by the reproduction amplifier 44 in this manner, for example, according to the characteristics of each of the reproduction heads RH1 to RH4.
Can be corrected. For example, the correction circuit 100 adjusts a signal level, adjusts a frequency characteristic, and adjusts and approximates a phase characteristic of a signal. However, the correction circuit 100 may be arranged at a stage before the reproduction signal transmission ring RR of the rotor core 30 in addition to the case where the correction circuit 100 is provided at the stage after the reproduction amplifier 44 of the stator core 20.

As shown in FIG. 9, the magnetic tape TP is
It is helically wound at an angle of about 90 degrees by the rollers 4c and 4d, but is not limited to this. The two reproducing heads RH1 and RH2 are arranged 90 degrees apart from the rotating drum 2 in FIG. 9, and the two reproducing heads RH1 and RH2 having a + azimuth angle perform track reproduction of a signal shifted by one track. Are aligned with the rotating drum 2. Similarly, the reproducing heads RH3 and RH4 having a negative azimuth angle are also aligned with respect to the rotating drum 2 so as to reproduce a signal shifted by one track.

The correction circuit 100 shown in FIG. 8 uses a reproduction signal R supplied from the reproduction amplifier 44 of the rotary transformer T.
S corrects the individual difference caused by the reproducing heads RH1 to RH4. The correction is performed, for example, by reproducing a reference signal written at a predetermined place, and adjusting the signal level or error at that time. A correction value is determined by detection or the like, and amplitude correction, frequency correction, phase correction, and the like of each reproduction signal can be performed. This correction circuit 100
The reproduced signal RS digitized by the above is detected in error for each block and stored in a memory. As a result, an on-track signal of the + azimuth track is selected from the two types of + azimuth reproduction signals RS, and reproduction is performed by a so-called non-tracking reproduction method.

Next, with reference to FIGS. 10 and 11, a rotary transformer T according to a second embodiment of the present invention and its peripheral functional parts will be described. In the embodiment shown in FIGS. 10 and 11, the magnetic tape TP is wound around the rotary drum 2 by the rollers 4c and 4d in a substantially 180-degree helical scan system as is apparent from comparison with FIG. The rotating drum 2 has four reproducing heads RH1, RH2, RH3, and RH.
4 and two recording heads WH1 and WH2.

As shown in FIG. 8, the reproducing heads RH1 and RH
2 supplies the reproduction signal R to the reproduction amplifiers 43A and 43B, respectively.
S is sent. Similarly, the reproduction heads RH3 and RH4 also transmit the reproduction signal RS to the reproduction amplifier 43.
C, 43D. The reproduction amplifiers 43A and 43B are connected to the reproduction signal transmission ring RR of the channel CH1-1 of the rotary transformer T. Similarly, the reproduction amplifiers 43C and 43D are also connected to the reproduction signal transmission ring RR of another reproduction channel CH1-2 of the rotary transformer T. There is a reproduction signal transmission ring RR of the stator core 20 facing the reproduction signal transmission ring RR on the rotor core 30 side of the reproduction channel CH1-1. The reproduction signal transmission ring RR is connected to the reproduction amplifier 44A. Similarly, the reproduction signal transmission ring RR of the stator core 20 faces the reproduction signal transmission ring RR of the rotor core 30 of the reproduction channel CH1-2. This reproduction signal transmission ring RR is connected to the reproduction amplifier 44B. These reproduction amplifiers 44A and 44B are connected to the processing unit 44a via the correction circuit 100.

By adopting such a configuration, FIG.
As shown in FIG. 11, the reproduction signals RS of the two reproduction signals RS1 and RS2 form a reproduction signal RSA1 arranged as shown in FIG.
1 to the correction circuit 100 side. Similarly, the reproduction signal RS of the reproduction heads RH3 and RH4
Also, as shown in FIG. 11C, the arranged reproduced signals RSA2 can be sent to the correction circuit 100 side. Thus, the reproduction signals R of the four reproduction heads RH1 to RH4 are
S can be transmitted to the outside via two reproduction channels CH1-1 and CH1-2.

Next, with reference to FIGS. 12 and 13, a description will be given of a rotary transformer T according to a third embodiment of the present invention and its peripheral functions. In the embodiment shown in FIGS. 12 and 13, the magnetic tape TP is wound around the drum 180 by a helical scan method by rollers 4c and 4d. In this case, the read head R
The reproduction amplifiers 43A and 43C of H1 and RH3 are connected to the reproduction signal transmission ring RR of the rotor core 30. Similarly, the reproduction amplifier 43 of the reproduction heads RH2 and RH4
B and 43D are connected to a reproduction signal transmission ring RR of another reproduction channel CH1-2. Reproduction head RH
1 and RH3 are shown in FIGS. 13A and 13B.
As shown in (1), the arranged reproduction signals RSA3 can be formed in time series and transmitted to the correction circuit 100 side through the reproduction channel CH1-1 in a non-contact manner. Similarly, the reproduction signal RS of the reproduction heads RH2 and RH4 is the reproduction channel CH
Via 1-2, the reproduced signals RSA4 arranged as shown in FIG. 13C can be formed and sent to the correction circuit 100 side.

Each reproducing head RH1, RH2, RH3, R
H4 reproduces the information on the magnetic tape TP of FIG. 1 and outputs the reproduction signal RS to the reproduction amplifiers 43A, 43B, 43C, 43D.
To the playback amplifiers 43A, 43B, 43C, 43D
The reproduction signal RS amplified in is transmitted to the reproduction signal transmission ring RR of the rotor core 30 of the channel CH1. The amplified reproduction signal RS is transmitted from the reproduction signal transmission ring RR of the rotor core 30 to the reproduction signal transmission ring RR of the stator core 20 in a non-contact manner, and the transmitted reproduction signal RS is reproduced on the stator core 20 side. The signal is further amplified by the amplifier 44. The amplified reproduction signal RS is supplied to the correction circuit 10
The signal is subjected to signal correction processing by 0, and is sent to the processing unit 44a outside the rotary magnetic head device.

The recording amplifier 45 on the fixed drum 1 side in FIG. 8 and the like applies a recording current from a recording signal source to the stator core 20.
Signal transmission ring WR of channels CH2 and CH3
Send to When the recording signal WS is transmitted from the recording signal transmission ring WR of the stator core 20 to the recording signal transmission ring WR of the rotor core 30, the recording current is transmitted directly from the recording signal transmission ring WR of the rotor core 30 to the recording head WH. . As described above, since the recording head WH is directly connected to the recording signal transmission ring WR of the rotor core 30, the recording head WH and the recording signal transmission ring WR of the rotor core 30 in the low frequency region have a low frequency band. Can be reduced. Recording signal transmission rings WR, WR arranged on channels CH2, CH3 are connected to channels CH1.
Of the power transmission system of the channel CH4 can be prevented. That is, the recording signal transmission rings WR, WR reduce crosstalk from the power transmission system of the channel CH4 to the reproduction signal system to the channel CH1.

Next, with reference to FIGS. 14 and 15, a description will be given of a rotary transformer T according to a fourth embodiment of the present invention and its peripheral parts. In the embodiment shown in FIGS. 14 and 15, the magnetic tape TP is wound around the drum 180 by a helical scan method by rollers 4c and 4d. The recording amplifier 45 on the fixed drum 1 sends the recording current from the recording signal source to the recording signal transmission ring WR of the channel CH2 of the stator core 20. When the recording signal WS is sent from the recording signal transmission ring WR of the stator core 20 to the recording signal transmission ring WR of the rotor core 30, the recording current is directly transmitted from the recording signal transmission ring WR of the rotor core 30 to the recording heads WH1 and WH2. Sent. The recording system has no circuit in the drum, and is connected in series from a one-channel rotor core 30 to a recording head WH1 having a + azimuth angle and a recording head WH2 having a -azimuth angle. The connection may be made in parallel, or the connection may be switched by an electronic switch provided in the drum.

The two recording heads WH1 and WH2 are disposed 180 degrees apart from the rotary drum 2, and the two recording heads WH1 and WH2 are provided every other rotation of the rotary drum 2.
2, recording current flows alternately, and tracks of both azimuths are recorded by two rotations. That is, the two recording heads WH1,
The WH2 is aligned with the rotating drum 2 such that tracks of both azimuths alternately form tracks on the magnetic tape TP. Therefore, the magnetic tape TP is
While the rotating drum 2 makes two rotations, it advances by two tracks. The recording signal WS of the recording heads WH1 and WH2 is
As shown in FIGS. 15A and 15B, the arranged recording signals WSA are formed in time series. Thus, the recording head W
H1 and WH2 are the recording signal transmission rings W of the rotor core 30.
Since it is directly connected to R, it is possible to reduce the impedance in the low frequency region of the recording signal system including the recording heads WH and WH2 and the recording signal transmission ring WR of the rotor core 30 in the low frequency region. The recording signal transmission ring WR arranged on the channel CH2 is
Crosstalk between the reproduction system of channel CH1 and the power transmission system of channel CH3 can be prevented. That is, the recording signal transmission ring WR reduces crosstalk from the power transmission system of the channel CH3 to the reproduction signal system of the channel CH1.

The reproducing amplifier 4 of the reproducing heads RH1 and RH2
3A and 43B are connected to a reproduction signal transmission ring RR of the rotor core 30. Two reproducing heads RH1 and RH
Numeral 2 is disposed 180 degrees apart from the rotating drum 2. A reproducing head RH1 having a positive azimuth angle and a reproducing head RH2 having a negative azimuth angle perform rotation reproduction of a signal shifted by one track. 2 are aligned. Reproduction head RH1, RH
As shown in FIGS. 15A and 15C, the reproduced signal RS of No. 2 forms the arranged reproduced signal RSA5 in time series,
Non-contact correction circuit 100 via reproduction channel CH1
Can be transmitted to the side.

Each of the reproducing heads RH1 and RH2 reproduces the information on the magnetic tape TP shown in FIG. 1 and sends a reproducing signal RS to the reproducing amplifiers 43A and 43B.
The reproduction signal RS amplified in B is sent to the reproduction signal transmission ring RR of the rotor core 30 of the channel CH1. The amplified reproduction signal RS is transmitted from the reproduction signal transmission ring RR of the rotor core 30 to the reproduction signal transmission ring RR of the stator core 20 in a non-contact manner, and the transmitted reproduction signal RS is reproduced on the stator core 20 side. The signal is further amplified by the amplifier 44. The amplified reproduction signal RS is supplied to the correction circuit 1
The signal is sent to a processing unit 44a outside the rotary magnetic head device after being subjected to signal correction processing by 00.

The tape speed and drum rotation speed during reproduction are
Same as those at the time of recording. However, while the rotary drum 2 makes one rotation, each of the reproducing heads RH1 and RH2 reproduces tracks of both azimuths. Are reproduced twice each. Although the recording heads WH1 and WH2 and the reproducing heads RH1 and RH2 are arranged 180 degrees apart from the rotary drum 2, the present invention is not limited to this. If contact, 1
It may be smaller than 80 degrees.

The switching means 50 shown in FIG. 8 and the like is a switching means for turning on / off the operation of the oscillator 41. The switching means 50 includes the oscillator 4
By turning 1 on or off, the oscillation operation for power supply is turned on or off. Thus, oscillator 4
1 is turned on / off for the following reason. That is, the switching means 50 is provided with the recording head W
When the magnetic head H is in contact with the magnetic tape TP (during signal recording), the oscillator 41 is turned off. When the magnetic head H is not in contact with the magnetic tape TP (during signal reproduction), the oscillator 41 is turned off. turn on. Recording head WH1, WH
When the recording head 2 is in contact with the magnetic tape TP, that is, when the recording heads WH1 and WH2 are recording signals on the magnetic tape TP, the reproducing head RH does not reproduce the signals on the magnetic tape TP. FIG. 8 from 41
The oscillator 41 is turned off because there is no need to supply power to the reproduction amplifier 43. On the other hand, when the recording heads WH1 and WH2 are not in contact with the magnetic tape T, that is, when the reproducing heads RH1 to RH4 are reproducing signals from the magnetic tape TP, the oscillator 41 is turned on and the regulator 43a is turned on. From playback amplifier 43A ~
Power can be supplied to 43D to amplify the reproduction signal RS of the reproduction head RH.

Therefore, when the recording head WH is the magnetic tape TP
Since the oscillator 41 is turned off in the state where the recording is performed while touching the channel, it is possible to reliably prevent the crosstalk from the power system of the channel CH4 to the reproduction signal system of the channel CH1 in FIG. When the DC current is converted into the AC current in the oscillator 41 and the AC current is converted again into the DC current in the rectifier 42, the AC current (A
C) so that the maximum frequency band of C) does not overlap the frequency band of the recording signal of channel CH2.
A method of preventing crosstalk from the power system No. 4 to the recording signal system of channel CH2 (the reproduction signal system of channel CH1) can also be adopted.

The embodiment of the present invention has been described with reference to the planar facing type rotary transformer T shown in FIG. However, the present invention is not limited to this, and the above-described embodiment can be applied to the cylindrical rotary transformer T1 shown in FIGS. A rotary transformer, which is a non-contact transmission device according to an embodiment of the present invention, includes both a signal area and a power area, and a crosstalk prevention unit is provided between them to ensure both signal and power. It can be transmitted without contact. This makes it possible to provide a first-stage regenerative amplifier in the drum of the rotary magnetic head device and prevent S / N from deteriorating.

In the illustrated embodiment, since power is supplied from the power system to the reproducing amplifiers 43A to 43D of the reproducing system, the reproducing head RH is, for example, a magnetoresistive element head (MR). ) Can be adopted. The reproducing magneto-resistive element head (MR) always needs a bias current to obtain a reproducing signal. However, the reproducing amplifiers 43A to 43D
, The reproducing signal can be obtained by operating the magnetoresistive element head. This magnetoresistive element head is a head that causes a change in resistance when a magnetic field changes. The head can convert a change in a signal magnetic field (input signal) into a change in resistance and extract it as a change in a reproduction output signal (voltage). It is. This magnetoresistive element head can obtain a high and stable reproduction output signal without depending on the speed of the magnetic tape TP.

In the embodiment of the present invention, the times at which the plurality of reproducing heads RH1, RH2, RH3, and RH4 are in contact with the tape-shaped information recording medium do not overlap with each other, and each of the reproducing heads RH1, RH2, RH3, RH
4 is connected to a reproduction amplifier. The reproduction signal RS is amplified by this amplifier and then sequentially arranged by the reproduction signal selection means 200 which functions as a switch circuit to become a reproduction signal of one channel. After the reproduction signal of the one channel is obtained, the reproduction signal of the one channel is transmitted to the signal processing unit side through the rotary transformer in a non-contact manner. That is, since the plurality of reproduction heads RH1, RH2, RH3, and RH4 have a temporally exclusive contact with the tape-shaped information recording medium, the reproduction signal RS is switched to one channel by switching after amplification. It is possible to

As described above, in the embodiment of the present invention, a recording track recorded on a tape-shaped information recording medium is read by a non-tracking reproducing method using a plurality of reproducing heads and one or a plurality of reproducing channels. When the information is reproduced by using the rotary transformer T, the switching of the reproduction signals from a plurality of reproduction heads is performed in the rotary drum, and the signals are aggregated into, for example, one channel or two channels. Transmit the signal. This eliminates the need to set a plurality of rotary transformers in the rotary magnetic head device, and achieves downsizing and cost reduction.

In the embodiment of the present invention,
Although four reproducing heads are described as an example, the present invention is not limited to this, and the present invention can be applied to a case where two, three, or five or more reproducing heads are provided. Although two recording heads are shown, the present invention is not limited to this, and the present invention can be applied to the case of three or more recording heads or only one recording head.

[0048]

As described above, according to the present invention,
In the case where signals of a plurality of recording tracks recorded on a tape-shaped information recording medium are reproduced using a plurality of reproducing heads regardless of the arrangement of the recording tracks on the information recording medium, downsizing can be achieved.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an embodiment of a rotary magnetic head device of the present invention.

FIG. 2 is a plan view showing an example of an information recording device including the rotary magnetic head device of FIG.

FIG. 3 is a diagram showing a configuration example of the rotary magnetic head device of FIG. 1 and showing a case where a built-in rotary transformer is of a flat facing type.

FIG. 4 is a diagram showing another configuration example of the rotary magnetic head device of FIG. 1 and showing a case where a built-in rotary transformer is a cylindrical type.

FIG. 5 is a perspective view showing the rotary transformer of FIG. 3;

FIG. 6 is a perspective view showing the rotary transformer of FIG. 4;

FIG. 7 is a partially omitted cross-sectional view showing a configuration example of the rotary transformer in FIG. 5;

FIG. 8 is a view showing a state of the rotary transformer and its peripheral portion of the first embodiment of the rotary magnetic head device of FIG. 1;

9 is a diagram showing an example of the arrangement of each reproducing head and recording head and an example of an arrangement of reproduced signals of the reproducing head in the embodiment of FIG. 8;

FIG. 10 is an exemplary view showing a state of a rotary transformer and its peripheral portion according to a second embodiment of the rotary magnetic head device of FIG. 1;

11 is a diagram showing an example of the arrangement of each reproducing head and recording head and an example of an arrangement of reproduced signals of the reproducing head in the embodiment of FIG. 10;

FIG. 12 is a view showing a state of a rotary transformer and its peripheral portion of a third embodiment of the rotary magnetic head device of FIG. 1;

13 is a diagram showing an example of the arrangement of each reproducing head and recording head and an example of the arrangement of reproduced signals of the reproducing head in the embodiment of FIG. 12;

FIG. 14 is a view showing a state of a rotary transformer and its peripheral portion of a fourth embodiment of the rotary magnetic head device of FIG. 1;

15 is a diagram showing an example of the arrangement of each reproducing head and recording head and an example of the arrangement of reproduced signals of the reproducing head in the embodiment of FIG. 14;

FIG. 16 is a view for explaining a conventional non-tracking reproduction method.

[Explanation of symbols]

1 ... fixed drum, 2 ... rotating drum, 10 ...
Rotating magnetic head device, 20: stator core (fixed body), 30: rotor core (rotating body), 41: oscillator (power stage oscillator), 200: reproduction signal selection means, 201 ... Magnetic sensor (rotation detecting means),
202: magnet (rotation detecting means), 205 ...
Selection signal generation means, T: rotary transformer (non-contact transmission device), T1: rotary transformer (non-contact transmission device), T: magnetic tape, RH1, RH
2, RH3, RH4 ... reproducing head, WH1, WH2
... Recording head, CH1 to CH5 ... Channel
RR: reproduction signal transmission ring (rotating body signal wiring section, fixed body signal wiring section), WR: recording signal transmission ring (rotating body signal wiring section, fixed body signal wiring section), PR: power transmission Ring (rotating body power wiring section, fixed body power wiring section)

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Takefuji Saito 6-7-35 Kita-Shinagawa, Shinagawa-ku, Tokyo Inside Sony Corporation (72) Inventor Mitsuteru Kamagaya 6-35, Kita-Shinagawa, Shinagawa-ku, Tokyo Sony Corporation

Claims (10)

[Claims] A transmission device for transmitting a power supply and a signal between a rotating body and a fixed body in a non-contact manner, and transmits signals of a plurality of recording tracks recorded on a tape-shaped information recording medium to information. A rotating magnetic head device for reproducing data using a plurality of reproducing heads regardless of the arrangement of recording tracks on a recording medium, comprising: a rotating body of a transmitting device, a rotating drum having a plurality of reproducing heads, and a stationary device having a fixed body of the transmitting device. A drum, a reproducing signal selecting means for selecting a reproducing signal from each reproducing head, and sequentially arranging the reproducing signals from each reproducing head; and a reproducing means arranged on the rotating body and transmitted from the reproducing signal selecting means. A rotating body reproduction signal wiring section to which a reproduction signal of the head is provided; a fixed body reproduction signal wiring section disposed on the fixed body for receiving a reproduction signal from the rotating body reproduction signal wiring section in a non-contact manner;
A rotary magnetic head device comprising: 2. The rotating magnetic head according to claim 1, wherein the reproduction signal selecting means sequentially arranges reproduction signals from a plurality of reproduction heads having + azimuth and reproduction signals from a plurality of reproduction heads having -azimuth. apparatus. 3. A reproduction signal selection means for arranging reproduction signals from a plurality of reproduction heads having + azimuth as a first arrangement signal and for reproducing signals from a plurality of reproduction heads having -azimuth as a second arrangement signal. 3. The rotary magnetic head device according to claim 2, wherein the rotary magnetic head device is arranged as: 4. The rotary magnetic head device according to claim 2, wherein the reproduction signal selection means sequentially arranges a reproduction signal from the reproduction head having + azimuth and a reproduction signal from the reproduction head having -azimuth. 5. The rotation according to claim 1, wherein the reproduction signal selection means arranges reproduction signals from a plurality of reproduction heads having + azimuth and arranges reproduction signals from a plurality of reproduction heads having -azimuth separately. Magnetic head device. 6. The rotating magnetic head device according to claim 1, wherein the rotating drum includes a plurality of recording heads. 7. The fixed body of the transmission device includes one fixed body reproduction signal wiring section, a fixed body power supply wiring section for transmitting power, and one fixed body reproduction signal wiring section and a fixed body power supply wiring section. And a fixed body recording signal wiring section provided between the fixed section and a recording signal for the recording head, wherein the rotating body of the transmission device includes one rotating body reproduction signal wiring section;
A rotating body power supply wiring section for transmitting power between the fixed body power supply wiring section of the fixed body and a fixed body recording signal wiring arranged between one rotating body reproduction signal wiring section and the rotating body power supply wiring section. 7. The rotating magnetic head device according to claim 6, further comprising: a rotating body recording signal wiring portion for receiving the recording signal from the rotating body in a non-contact manner. 8. The rotating drum has a plurality of recording heads, is arranged on a stationary body, has one stationary body recording signal wiring section to which a recording signal of the recording head is given, and is arranged on the rotating body. 2. The rotary magnetic head device according to claim 1, further comprising: one rotating body recording signal wiring section which receives a recording signal from the fixed body recording signal wiring section in a non-contact manner and supplies the recording signal to each recording head. 9. The rotating magnetic apparatus according to claim 8, wherein the recording head performs different azimuth recording while the rotating drum makes two rotations, and the reproducing head performs different azimuth reproducing while the rotating drum makes one rotation. Head device. 10. The rotating magnetic head device according to claim 9, wherein the recording heads having different azimuths contact the information recording medium at different timings.