JP2001101603A - Magnetic recording and reproducing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the performance of a device while the D-VHSHS mode is available by constituting a rotary transformer with the simple structure at a low cost capable of preventing the crosstalk between a control signal route and a video signal route. SOLUTION: On a preamplifier substrate 6 in a rotary cylinder 2, 1.2 pieces of magnetic heads 5A-5L including the magnetic head for the D-VHSHS mode are connected, and a recording/reproducing amplifier and a switch circuit are provided on the preamplifier substrate to control the changeover of the head by the switch circuit at the time of recording/reproducing operation, and video data or a reproducing/recording signal of the data are transmitted between the circuit means of a main body of the device through the transmission route of the 2nd rotary transformer 9 with two channnels, and a control signal for changing over the switch circuit, or the like, is similarly transmitted through the 1st rotary transformer 8 with two channels. Thus, the rotary transformers are manufactured with the simple structure at a low cost while reducing the number of channels and the number of short rings, then the crosstalk is prevented by dividing the respective transmission routes.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic recording / reproducing apparatus having a rotary cylinder on which a plurality of magnetic heads and a preamplifier board such as an amplifier and a switch circuit are mounted. The present invention relates to a magnetic recording / reproducing apparatus capable of easily improving the performance of a device at a low cost by preventing the above.

[0002]

2. Description of the Related Art In a helical scan type magnetic recording / reproducing apparatus such as a VTR, reproduced video signals and the like read by a plurality of rotary heads at the time of reproduction are each passed through a non-contact rotary transformer (hereinafter referred to as a rotary transformer). After transmitting the data through a preamplifier, the head is switched, and an effective reproduced signal is generally connected to obtain a reproduced signal.

[0003] In recent years, along with digitization in various video equipment and broadcasting fields, various proposals have been made for a magnetic recording / reproducing apparatus to cope with this. For example, VHS
With the standardization of D-VHS, which is a digital format, various modes of recording can be performed as compared with the current analog system, and the performance of the magnetic recording / reproducing apparatus is improved.

In such a D-VHS standard,
Further, it has been proposed that various modes such as a mode called a D-VHSHS mode be provided in order to support recording of high-definition (HD) digital video and multi-channel broadcasting. Accordingly, in the magnetic recording / reproducing apparatus, such a D-VHS is structurally or circuitically.
It is possible to execute all various modes according to the standard, and it is desired to improve device performance.

By the way, in order to execute various modes and improve the performance of equipment, it is necessary to increase the number of rotary heads. Therefore, in the recording or reproducing method in the magnetic recording / reproducing apparatus described above, as many rotary transformers as the number of rotary heads are required, and a member called a short ring for preventing mutual interference of signals (also referred to as crosstalk) is required. In addition to the increase, it is necessary to form a groove for installing the groove, so that the manufacturing process is complicated and the cost is eventually increased.

Therefore, a system is considered in which a preamplifier board such as a recording amplifier, a reproducing amplifier, and a switch circuit is mounted in a rotary cylinder, and signals are switched in the rotary cylinder, whereby the number of rotary transformers can be reduced. ing.

According to this system, a preamplifier substrate having a reproduction amplifier, a switch circuit, and the like is provided in a rotary cylinder, and head switching can be performed by transmitting a control signal (also referred to as a control signal) from a device body. Since it is possible, the number of channels required for the rotary transformer can be reduced by adjusting the video signal path and the like, and accordingly, there is a feature that members such as short rings are also reduced.

However, a magnetic recording / reproducing apparatus having such a system can execute a mode called the D-VHSHS mode of the D-VHS standard while maintaining the current executable mode in order to improve the device performance. In order to achieve this, at least twelve rotary heads corresponding to each mode are required, so that the number of channels of the rotary transformer increases, and between each channel having a role of a control signal path or a video signal path. The structure of the rotary transformer itself becomes complicated, for example, the number of short rings for preventing crosstalk increases, and the manufacturing process becomes complicated and costly. Therefore, D-
In order to improve the performance of the apparatus by enabling the VHSHS mode to be executed, there is a demand for an improvement in which the manufacturing process of a main member such as a rotary cylinder including a rotary transformer is easy and can be performed at low cost.

[0009]

As described above, in a conventional magnetic recording / reproducing apparatus, a preamplifier board such as a recording amplifier, a reproducing amplifier, and a switch circuit is mounted in a rotary cylinder, and signals are switched in the rotary cylinder. Therefore, a system that reduces the number of rotary transformers and the number of channels is adopted, but in order to improve device performance, while maintaining the current executable mode,
In order to be able to execute a mode called the D-VHSHS mode of the D-VHS standard, at least 12 rotary heads corresponding to each mode are required. Therefore, the number of channels of the rotary transformer increases, In addition, the structure of the rotary transformer itself becomes complicated, for example, the number of short rings for preventing crosstalk between channels each serving as a control signal path or a video signal path increases, which complicates the manufacturing process and reduces cost. There was a disadvantage that it became expensive.

In view of the above, the present invention has been made in view of the above problems, and a rotary transformer capable of preventing crosstalk between a control signal path and a video signal path with a simple configuration at low cost can be provided. It is an object of the present invention to provide a magnetic recording / reproducing apparatus capable of executing a VHSHS mode and improving device performance.

[0011]

A magnetic recording / reproducing apparatus according to the present invention comprises a fixed cylinder, a rotary cylinder rotatably disposed with respect to the fixed cylinder, and a plurality of magnetic heads provided on the rotary cylinder. And an information signal processing circuit material including at least a plurality of amplifiers attached to the rotating cylinder so as to rotate with the rotating cylinder and electrically connected to the plurality of magnetic heads, and at least an output of the amplifier. A switch circuit member including a switch circuit capable of leading the outputs of the plurality of magnetic heads to a common information signal output terminal, and a printed board provided with a control signal input terminal for switching and controlling the switch circuit; A rotor attached to the rotating cylinder and a stator attached to the fixed cylinder so as to face the rotor. A first and a second rotary transformer formed separately from each other, wherein the first rotary transformer is disposed on the rotor and connected to an information signal output end of the printed circuit board. A winding, and a stator winding disposed on the stator and connected to an output end of the information signal outside the cylinder, wherein the second rotary transformer is disposed on the rotor and controls the printed circuit board. It has a rotor winding connected to an input terminal and a stator winding connected to an input terminal outside the cylinder, which is provided on the stator and receives the control signal.

According to the present invention, in the magnetic recording / reproducing apparatus having the above-mentioned configuration, a rotor winding disposed on the rotor and connected to an information signal output terminal of the printed circuit board with respect to the first rotary transformer; A stator winding disposed on the stator and connected to an output terminal outside the cylinder of the information signal; and a control signal input terminal of the printed circuit board disposed on the rotor for the second rotary transformer. And a stator winding disposed on the stator and connected to an outside-cylinder input terminal to which the control signal is input,
Since the number of channels and the number of short rings can be reduced, these rotary transformers can be manufactured with a simple configuration and at low cost, and since each transmission path is divided, crosstalk can be prevented, so that signal reliability can be reduced. Can be improved. Further, since a magnetic head for D-VHSHS can be provided as a plurality of magnetic heads, the external mode can be executed with a simple configuration, that is, it is possible to improve device performance.

[0013]

Embodiments of the present invention will be described with reference to the drawings.

FIG. 1 shows an embodiment of a magnetic recording / reproducing apparatus according to the present invention, and is a cross-sectional view for explaining the structure of a rotary cylinder provided in the apparatus.

As shown in FIG. 1, the magnetic recording / reproducing apparatus 1 of this embodiment is provided with a rotary cylinder mechanism.

The rotary cylinder mechanism includes a rotary cylinder 3 that rotates in conjunction with the rotary shaft 2, a fixed cylinder 4 that supports the rotary shaft 2 and is fixed at a predetermined position in the apparatus main body, A plurality of magnetic heads 5A to 5L mounted so as to come into contact with a magnetic recording medium sliding on the outer peripheral surface of the rotary cylinder 3 and arranged at predetermined positions of the rotary cylinder 3 so as to protrude from the outer peripheral surface by a predetermined amount; A preamplifier board 6 including a group of electronic circuits such as a recording amplifier and a reproduction amplifier necessary for taking in signals supplied by the magnetic heads 5A to 5L or supplying a recording signal, and electrically connected to the preamplifier board 6; And first and second non-contact rotary transformers 8 and 9 serving as transmission paths for reproduction signals, recording signals, or control signals with the main circuit of the device main body. In it is configured.

The rotary cylinder 3 is configured to rotate by transmitting torque when the upper surface of the rotary cylinder 2 is axially mounted on the rotary shaft 2. The lower portion of the rotary cylinder 3 is firstly screwed by a mounting screw 14 via a member. The rotor 8b of the rotary transformer 8 and the preamplifier board 6 are mounted, and the rotor 9b of the second rotary transformer 9 is mounted on the bottom near the center where the rotating shaft 2 is located.

That is, when the rotary cylinder 3 rotates, each rotor 8 of the first and second rotary transformers 8 and 9 rotates.
b, 9b and the preamplifier substrate 6 rotate in conjunction with each other. The rotation of the rotary cylinder 3 is smoothly performed by a plurality of bearings 11 provided between the rotary cylinder 2 and the rotary shaft 2.

On the other hand, a fixed cylinder 4 is disposed below the rotary cylinder 3, and a cylinder motor rotor 3A is provided between the fixed cylinder 4 and the rotary cylinder. A first rotary transformer 8 is disposed inside the cylinder motor 3A, and a stator 8a of the rotary transformer 8 is mounted. Further, a second rotary transformer 9 is disposed in the upper portion near the center of the cylinder motor rotor portion 3A which is axially mounted on the rotating shaft 2, and a stator 9a of the rotary transformer 9 is attached.

The plurality of magnetic heads 5A to 5L are fixed to the bottom surface of the upper cylinder 3 by mounting screws 14a. A conductive brush 7a connects between the magnetic heads 5A to 5L and the preamplifier substrate 6, and a conductive brush connects between the preamplifier substrate 6 and the rotors 8B and 9B of the first and second rotary transformers 8 and 9. 7b and a connection line (not shown).

A connection line 14 is connected to each of the stators 8a and 9a of the first and second rotary transformers 8 and 9, and the connection line 14 is connected to a signal processing circuit and a control circuit (not shown) in an apparatus body. And so on.

FIG. 2 is a diagram showing an example of the arrangement of a plurality of magnetic heads.

As shown in FIG. 2, in the magnetic recording / reproducing apparatus 1 of the present embodiment, for example, in order to improve the performance of the apparatus, the D-VHSHS standard of the D-VHS standard is maintained while maintaining the currently executable form. At least 12 magnetic heads necessary for enabling a mode called a mode are provided.

The recording and reproducing methods that can be executed by the magnetic recording / reproducing apparatus 1 include the HiFi method, the S-VHS method, the SD mode and the HS mode in the D-VHS standard as shown in FIG. The magnetic heads 5A to 5L corresponding to the system are arranged as shown in the figure.

For example, HiFi magnetic heads 5A and 5A
B is a rotary cylinder 3 with two single heads each.
Magnetic head 5C for S-VHS
Reference numerals 5F to 5F denote double azimuth heads, which are similarly arranged at predetermined positions of the rotary cylinder 3. The magnetic heads 5J and 5I for D-VHSSD are two single heads, respectively, and the magnetic heads 5A and 5B for HiFi, respectively.
And are disposed so as to be adjacent to. Furthermore, D-VH
Magnetic heads 5G, 5H, 5 provided for SHS
K and 5L are two double azimuth heads, which are arranged at predetermined positions of the rotary cylinder 3 as shown in the figure. That is, in the helical scan method, since a recording medium (not shown) is wound around at least half of the outer peripheral surface of the rotary cylinder 3, the magnetic heads corresponding to the respective methods are opposed to each other via the center of the rotary cylinder 3. As a result, both types of magnetic heads can be used simultaneously.

Although not shown, the preamplifier substrate 6 includes a recording amplifier and a reproducing amplifier necessary for taking in the signals obtained by the plurality of magnetic heads 5A to 5L or supplying recording signals, a capacitor 13, a switch circuit 15a, Fifteen
b, etc., as described above, via the conductive brush 7b, the connection line (not shown), the first and second rotary transformers 8, 9 and the signal path formed through the connection destination 14, and the video signal ( Video data) or data, or a control signal is transmitted.

The first and second rotary transformers 8 and 9 include a stator 8a, 9a and a rotor 8b, respectively.
9b for transmitting video data or data or control signals during reproduction or recording by electromagnetic coupling of the first and second rotary transformers 8 and 9, respectively. Further, the second rotary transformer 9 is configured to be smaller than the outer diameter of the first rotary transformer 8, and the installation space inside the rotary cylinder 3 is also small.

The non-contact surfaces of the first and second rotary transformers 8 and 9 have three grooves 10a and 10a, respectively.
a, 10b are formed, and two grooves 10a, 10a
Is provided with a channel 10c for transmitting video data or data or a control signal, and the other groove 10b is provided with a short ring 16 for preventing crosstalk of signals between these channels. It has become. .

In the case of the present embodiment, the first rotary transformer 8 transmits video data or data exclusively during recording or reproduction, and the second rotary transformer 9 transmits the video data or data from the circuit means of the apparatus body. Are transmitted exclusively for use, and these rotary transformers 8 and 9 form respective transmission paths. Therefore, the first rotary transformer 8 can transmit a satisfactory control signal even if the parallelism between the stator 8a and the rotor 8b is not configured with strict accuracy, but transmits video data or data. The second rotary transformer 9 requires strict parallelism between the stator 9a and the rotor 9b.
That is, it is necessary to ensure a uniform gap between the non-contact surfaces of the stator 9a and the rotor 9b. For this reason, by providing a gap washer 12 as a gap management means between the stator 9a of the second rotary transformer 9 and the lower cylinder 3b, a sufficient parallelism can be obtained by always ensuring a predetermined amount of gap. ,
The reliability of control signal transmission is improved.

By the way, in the present embodiment, a system in which a preamplifier substrate is provided in a rotary cylinder and head switching is possible as in the prior art is adopted.
Further, it is possible to configure a rotary transformer that can prevent crosstalk between the control signal path and the video signal path with a simple configuration and at low cost, and is capable of executing the D-VHSHS mode to improve device performance. . That is, even if the number of D-VHSHS magnetic heads is increased, the circuit in the preamplifier substrate 6 is configured to cope with the increase, and further, each signal path by each rotary transformer is formed.

FIG. 3 is a block diagram showing a circuit diagram of the rotary cylinder portion having the above-mentioned structure mounted on the magnetic recording / reproducing apparatus.

As shown in FIG. 3, the preamplifier substrate 6
Are provided with first and second circuit portions 6a and 6b, and the above-described magnetic heads 5A to 5H are connected to the first circuit portion 6a. The magnetic heads 5I to 5L are connected to the second circuit section 6b. This second circuit section 6b
In this example, four magnetic heads are connected. However, when another mode is newly provided and the mode is adapted to execute this mode, four more magnetic heads can be connected.

Although not shown, the first and second circuit sections 6a and 6b are equipped with a reproduction amplifier and a recording amplifier required for reproduction or recording, respectively. Further, as shown in FIG. Switch circuits 15a and 15b for switching and transmitting signals from the magnetic head are mounted respectively.

These two switch circuits 15a, 15b
The switching is controlled by a control signal supplied from a circuit means of a device main body (not shown) via a signal path formed by two channels of the first rotary transformer 8.

On the other hand, the switch circuits 15a and 15b, whose switching is controlled by the control signal, switch to a magnetic head corresponding to a desired mode at the time of reproduction or recording. For example, at the time of reproduction, reproduction is amplified by a reproduction amplifier. Signal (video data or data) to the second
The signal is transmitted to circuit means (not shown) via a signal path formed by the two channels of the rotary transformer 9 and the recording signal (video data or data) supplied via the signal path is recorded. After being fetched and amplified by a recording amplifier or the like, it is transmitted to the magnetic head of the corresponding mode.

That is, the first rotary transformer 8 provided in the rotary cylinder 3 serves as a signal path for transmitting only control control signals, and the second rotary transformer 9 serves as a signal path for transmitting video data or data only. Become a route.

FIG. 4 is a specific circuit configuration diagram of a main part including the preamplifier substrate 6 shown in FIG. Although FIG. 4 shows the configuration of the first circuit section 6a, the description of the second circuit section 6b will be omitted since it has the same circuit configuration.

As shown in FIG. 4, one ends of the magnetic heads 5A to 5H are grounded via switches 22a to 22h, and the other ends of the magnetic heads 5A to 5H are connected to a switch 23.
a, 23c, 23d, and 23e, respectively. The other ends of the switches 22a and 22b, one ends of which are grounded, are connected to the fixed contacts 5aa and 5ab of the switch 5a via the amplifiers 4a and 4b, respectively.
The other end of the switch 22d is connected to the switch 5 via the amplifiers 4c and 4d.
The other ends of the switches 22c and 22d whose one ends are grounded to the fixed contacts 5ba and 5bb of the switch b are connected to the fixed contacts 5ba and 5bb of the switch 5b via the amplifiers 4c and 4d. The end is amplifier 4e,
4f, the fixed contacts 5ca, 5cb of the switch 5c
The other ends of the switches 22g and 22h whose one ends are grounded are connected to the fixed contacts 5 of the switch 5d via the amplifiers 4h and 4i.
da and 5db.

The movable contact 5ac of the switch 5a is connected to a coil 8b having one end on the rotary head side of the first rotary transformer 8 grounded via an amplifier 17 in the bidirectional transmission circuit 8A.
, And to the input of the amplifier 19. The output of the amplifier 19 is supplied to the HPF 20 and the LPF 21, and the output of the LPF 21 is connected to the other ends of the magnetic heads 5A and 5B via the current output amplifier 22. The output of the HPF 20 is supplied to the demodulation circuit 13 and its outputs 13a to 13
c, a recording / reproduction / control signal and a magnetic head reproduction output switching signal signal are output.

The movable contact 5bc of the switch 5b is connected to the fixed contact 51a of the switch circuit 51, and the movable contact 51d of the switch circuit 51 is connected to the first rotary transformer 8 via the amplifier 24 in the bidirectional transmission circuit 8B. Is connected to the other end of the grounded coil 8d and to the input of the amplifier 26. The output of the amplifier 26 is supplied to the movable contact 50d of another switch circuit 50. The fixed contact 50a of the switch 50
a, the output of the amplifier 26 is connected to the other ends of the magnetic heads 5C and 5D, and the fixed contact 50b is connected to the amplifier 27.
b, is connected to the other ends of the magnetic heads 5E, 5F, and the fixed contact 50c is connected to the magnetic heads 5G, 5F via an amplifier 4g.
The output from the amplifier 26 is similarly supplied by connecting to the other end of H.

The movable contact 5cc of the switch 5c is connected to the fixed contact 51b of the switch circuit 51, and the movable contact 51c of the switch circuit 51 is connected to the movable contact 5 of the switch 5d.
dc.

The other end of the coil 8a of the first rotary transformer 8 whose one end on the fixed cylinder side is grounded is supplied to an LPF 29 via a voltage output amplifier 28. LPF29
Is output to the movable contact 30a of the switch 30 and the switch 3
The fixed contact 30b of 0 outputs to the output terminal 31 as an audio FM reproduction signal, and the fixed contact 30c outputs to the output terminal 32 as an envelope comparison signal. An input terminal 33 supplies a control signal to the input terminal 33. The input terminal 33 is connected to one input of an adder 35 via a modulation circuit 34, and an input terminal 36 is used to supply an audio FM recording signal. , Input terminal 36 is connected to the other input of adder 35. Adder 35
Is connected via a current output amplifier 37 to the other end of the coil 8a, one end of which is grounded.

The other end of the coil 8c of the first rotary transformer 8 whose one end on the fixed cylinder side is grounded is connected via a voltage output amplifier 38 to an output terminal 39 for outputting a video reproduction signal. An input terminal 40 supplies a video reproduction signal. The input terminal 40 is connected to the other end of the coil 8c whose one end is grounded via a current output amplifier 41.

Then, the signals are output to the output terminals 32, respectively. Three
An input terminal 3 supplies a control signal to the input terminal 33. An input terminal 33 is connected to one input of an adder 35 via a modulation circuit 34, and an input terminal 36 is used to supply an audio FM recording signal. , Input terminal 36 is connected to the other input of adder 35. The output of the adder 35 is connected via a current output amplifier 37 to the other end of the coil 8a whose one end is grounded.

At the time of recording, if the format of the VHS system supplied to the input terminal 22 is 1.3 Mhz
And an audio FM recording signal of 1.7 Mh is a signal obtained by superimposing, by an adder 35, a signal obtained by modulating a control signal supplied to an input terminal by a modulation circuit 34 at a frequency as high as possible for transmission, for example, 10 Mhz to 12 Mhz. Is transmitted to the rotary cylinder side through the bidirectional transmission circuit 8A. In the rotating cylinder, an audio FM recording signal is extracted via an LPF 21 and a control signal is extracted via an HPF 20.

The control signals are the outputs 13 a to 1 of the demodulation circuit 13.
3c, the signals are converted into recording / reproduction / control reproduction signals, magnetic head reproduction output switching signals, and the like, and the respective signals are recorded / reproduction switching switches 22a-22h and 23a, 23.
c, 23d, 23e and the first and second switch circuits 5
0, 51 and 5a to 5d for switching the reproduction output of the magnetic head, and switches 23a to 23h are short-circuited.
c, 23d and 23e are open.

The audio FM recording signal is amplified by the amplifier 22 and recorded on the magnetic tape via the magnetic heads 5A and 5B. The video signal supplied to the input terminal 30 is transmitted to the rotating cylinder through the bidirectional transmission circuit 8B, and is amplified by, for example, the amplifier 27a in the long-time mode, and is recorded on the magnetic tape via the magnetic heads 5C and 5D. Also, D
In the −VHSHS mode, the signal is supplied to the amplifier 4g via the switch circuit 51, amplified, and recorded on the magnetic tape via the magnetic heads 5G, 5H.

At the time of reproduction, the control signal controls each switch as in the case of recording, and the switches 23a to 23h are open, and the switches 23a, 23c, 23d and 23e are short-circuited. The audio FM reproduced signal reproduced from the magnetic tape is input to the amplifiers 4a and 4b via the magnetic heads 5A and 5B and amplified. Then, a specific head output is selected by the switch 5a, transmitted to the fixed cylinder side by the bidirectional transmission circuit 8A, and output to the output terminal 31 via the LPF 29 and the switch 30.
The audio FM reproduction signal is taken out.

The video signal reproduced from the magnetic tape is input to the amplifiers 4c and 4d via the magnetic heads 5C and 5D and amplified in the long-time mode, for example. Then, a specific head output is selected by the switch 5b, transmitted to the fixed cylinder side by the bidirectional transmission circuit 8B, and a video signal is extracted through the output terminal 39. In the D-VHSHS mode, the amplifiers 4h and 4i are connected via the magnetic heads 5G and 5H.
And amplify it. Then, a specific head output is selected by the switch 5d, transmitted to the fixed cylinder side by the bidirectional transmission circuit 8B via the switch circuit 51, and the video signal is extracted via the output terminal 39.

A control signal for controlling switching of the magnetic head is fetched by a circuit group including the switch circuit 15a operating as described above, and a predetermined magnetic head is selectively switched from a plurality of channels using the control signal. Recording and reproduction can be performed by the selected magnetic head.

The above description shows the first circuit section 6a of the preamplifier board 6, but the second circuit section 6b mounted on the preamplifier board 6 has substantially the same configuration. Act on. In this case, the second
In the circuit section 6b, at least four magnetic heads, that is, the D-VHSSD magnetic heads 5I and 5J and the DVHSHS magnetic heads 6K and 5L, are provided. As a circuit configuration of FIG. 4, a part of a circuit part based on S-VHSSP shown in FIG. 4 is used, while a circuit configuration for D-VHSHS uses part of a circuit part based on S-VHSEP. May be configured.

Therefore, according to the above configuration, in a system in which a preamplifier substrate including a switch circuit is provided in a rotary cylinder and a plurality of magnetic heads can be switched,
Even when twelve magnetic heads including the D-VHSHS mode magnetic head are provided, the first and second rotary transformers 8 are provided by providing the second rotary transformer serving as a video data or data dedicated signal path. , 9 can each be composed of two channels,
Each signal can be transmitted reliably.

The signal path for video data or data by the second rotary transformer 9 and the signal path for control control signals by the first rotary transformer 8 are structurally separated from each other. So
Crosstalk between these signals can be prevented, and the reliability of the transmitted signal can be improved.

Since each of the first and second rotary transformers 8 and 9 has only two channels, the number of grooves for mounting these channels can be reduced, and the manufacturing process can be simplified. And also
Since the number of members such as short rings for preventing crosstalk between channels can be reduced, the cost of the entire device can be reduced.

Further, by providing a gap management means such as a gap washer, it is possible to easily improve the gap accuracy of the second rotary transformer which requires the gap management.

As described above, according to the present embodiment, a rotary transformer capable of preventing crosstalk between the control signal path and the video signal path with a simple configuration at a low cost can be configured, and the D-VHSHS mode Can be executed, and the device performance can be improved.

In this embodiment, the first rotary transformer 8 serving as a control signal transmission path is used.
And a second rotary transformer 9 serving as a video data or data transmission path has been described. However, the present invention is not limited to this configuration. A single rotary transformer having four channels may be used. In this case, the number of short rings for preventing crosstalk increases, but the same operation and effect as in the above embodiment can be obtained.

Although the present embodiment is adapted to a magnetic recording / reproducing apparatus for recording / reproducing normal video data, the D-VHSHS mode capable of high-density recording and high-speed recording / reproducing. Can be applied to a data streamer that records and reproduces other data at a high speed, which greatly contributes to expansion of a use range.

[0059]

As described above, according to the present invention, a rotary transformer capable of preventing crosstalk between a control signal path and a video signal path with a simple configuration at a low cost can be formed, and a D-VHSHS mode can be realized. And a magnetic recording / reproducing apparatus capable of improving device performance.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view illustrating an embodiment of a magnetic recording / reproducing apparatus according to the present invention and illustrating a configuration of a rotary cylinder portion provided in the apparatus.

FIG. 2 is a diagram showing an example of the arrangement of a plurality of magnetic heads provided in the apparatus.

FIG. 3 is a block diagram showing a circuit of a rotary cylinder mounted on the apparatus.

FIG. 4 is a specific circuit configuration diagram of a main part including a preamplifier substrate of FIG. 3;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Magnetic recording / reproducing apparatus, 2 ... Rotating shaft 3 ... Rotating cylinder, 3A ... Cylinder motor rotor part, 3b ... Lower cylinder, 4 ... Fixed cylinder, 5A-5L ... Magnetic head, 5a-5L ... Chip, 6 ... Preamplifier board, 6a: first circuit portion; 6b: second circuit portion; 7a, 7b: conductive brush; 8: first rotary transformer; 9: second rotary transformer; 8a, 9a: stator; 8b, 9b: rotor 10a, 10b groove, 10c channel, 15a, 15b switch circuit, 16 short ring.

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Shinichi Yamada 1-1-1 Shibaura, Minato-ku, Tokyo Inside Toshiba Video Products Japan Co., Ltd. (72) Takashi Fukagawa 3-3-9 Shimbashi, Minato-ku, Tokyo No. F-term (reference) in Toshiba BB Corporation 5D091 AA04 BB01 BB03 EE07 EE08 EE24 EE31 HH06 HH20

Claims (5)

[Claims] A fixed cylinder; a rotating cylinder rotatably disposed with respect to the fixed cylinder; a plurality of magnetic heads provided on the rotating cylinder; and a rotating cylinder rotating with the rotating cylinder. An information signal processing circuit material including at least a plurality of amplifiers attached to the plurality of magnetic heads and electrically connected to the plurality of magnetic heads; and at least an output of the amplifier is selected to output an output of the plurality of magnetic heads to a common information. A switch circuit member including a switch circuit that can be led to a signal output terminal; a printed circuit board provided with an input terminal for a control signal for switching and controlling the switch circuit; a rotor attached to the rotary cylinder; A first and a second body formed separately from each other and comprising a stator attached to the fixed cylinder so as to face each other; 2. The rotary transformer of claim 2, wherein the first rotary transformer is provided on the rotor and connected to an information signal output terminal of the printed circuit board, and a cylinder of the information signal provided on the stator. A stator winding connected to an external output end, wherein the second rotary transformer is provided on the rotor and connected to a control signal input end of the printed circuit board; And a stator winding connected to an input terminal outside the cylinder to which the control signal is input. 2. The first rotary transformer has a pair of magnetic disks having a first diameter, a rotor winding and a stator winding arranged in a circumferential direction so as to face each other on a plane, In the second rotary transformer, a rotor winding and a stator winding are arranged circumferentially on a pair of magnetic disks having a second diameter larger than the second rotary transformer so as to face each other in a plane. The magnetic recording / reproducing apparatus according to claim 1, wherein the magnetic recording / reproducing apparatus is formed so as to be provided. 3. The magnetic recording / reproducing apparatus according to claim 2, further comprising a gap management means for adjusting a gap between the rotor and the stator of the first rotary transformer. 4. The first rotary transformer is configured to transmit an output information signal by one channel to an output end of the printed circuit board that outputs the outputs of the plurality of magnetic heads in common, The second rotary transformer is connected to the control signal input terminal of the printed circuit board by one.
2. The magnetic recording / reproducing apparatus according to claim 1, wherein the control signal is transmitted on one channel. 5. The printed circuit board further includes a recording amplifier circuit for amplifying an information signal to be recorded and an information signal input terminal, and a rotor winding of the first rotary transformer is connected to the information signal input terminal and the information signal input terminal. 2. The magnetic recording / reproducing apparatus according to claim 1, wherein the magnetic recording / reproducing apparatus is commonly connected to a signal output terminal.