JPH07176001A - Magnetic recording and reproducing device - Google Patents

Abstract

PURPOSE:To perform recording and reproducing with a rotary transformer having a smaller number of channels than magnetic heads by reducing the number of channels of the rotary transformer in simple constitution. CONSTITUTION:A primary side coil 9 is wired in a groove in the lower surface of a primary side rotary transformer 5 to go half round on the side opposite to a primary side coil 8, and is passed through holes 9c and 9d to be led out to the upper surface. A terminal 9b is connected to a terminal 1b of a magnetic head 1, while a terminal 9a to a terminal 2a. The magnetic heads 1 and 2 are arranged on the outer periphery of the rotary drum on the sides opposite to each other by 180 degrees. The winding angle of a magnetic tape around the rotary drum is set to be <=180 degrees. Thus, a signal detected by the magnetic head 1 is transmitted via the primary side coil 8 and a secondary side coil 12 to a recording and reproducing circuit without being influenced by the head 2. The same is the case with the heads 2-4. In this constitution, since two concentric circular grooves having different radii can be formed opposite to each other, the primary side and secondary side coils can be constituted of two channels respectively, thus achieving miniaturization of the rotary transformer and the drum.

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 using a rotary head, and more particularly to the structure of a rotary transformer.

[0002]

2. Description of the Related Art In a magnetic recording / reproducing apparatus in which a magnetic head is mounted on a rotating drum, in order to transmit a signal between the magnetic head and the recording / reproducing circuit, generally, each magnetic head has a one-to-one correspondence. A corresponding rotary transformer is provided, and concentric circular coils are arranged to face the rotary transformer, and signals are transmitted through the coils.

However, in a rotary drum equipped with a large number of magnetic heads for high-density magnetic recording like a digital VTR, there is a limit to efficiently disposing a multi-channel rotary transformer on a small rotary drum. The number of magnetic heads that can be mounted on a small rotating drum is limited due to the restriction of the rotating transformer.

Conventionally, a structure for reducing the number of channels of a rotary transformer is disclosed in Japanese Patent Laid-Open No. 58-215705.
It is described in Japanese Patent Publication No. According to the publication, a switch for switching the two magnetic heads disconnects the circuit of the other magnetic head when one magnetic head is operating, and switches the signal derived from the one magnetic head. By transmitting to the rotary transformer through the switch,
The number of rotating transformers required is halved.

[0005]

In the configuration of the above-mentioned conventional example, the electronic parts of the changeover switch circuit must be mounted on the rotary drum, and the number of parts increases, and the magnetic head can be mounted on a small rotary drum. There is a limit to the number. Further, it is necessary to control the switching timing of the changeover switch, which causes a problem that the control circuit becomes complicated.

Therefore, according to the present invention, it is possible to reduce the number of channels of the rotary transformer with a simple structure, enable recording and reproduction with the rotary transformer having the number of channels smaller than the number of magnetic heads, and realize a small rotary drum. To aim.

[0007]

In order to achieve the above object, in a magnetic recording / reproducing apparatus of the present invention, a primary coil connected to a magnetic head and extending along at least a part of a circumference is provided. , A rotary transformer having a substantially ring-shaped secondary coil connected to a recording / reproducing circuit facing each other, and m (m is 2 or more) magnetic heads are provided on the outer circumference of the rotary drum. A magnetic recording / reproducing apparatus, which is arranged at predetermined intervals and in which a magnetic recording medium slides on the rotating drum, and is arranged on the rotating drum so that two or more magnetic heads do not slide simultaneously on the magnetic recording medium. With
The number of channels of the secondary coil is one, regardless of the number of channels of the primary coil.

In the structure of the primary coil according to the present invention, the circumference of the primary coil is divided into 360 / m degrees according to the number m of the magnetic heads, and the rotary transformer. And one end of one of the divided coils is connected to one terminal of the magnetic head.
The other end of the one coil is connected to one terminal of the other magnetic head, and both ends of the other divided coil are similarly connected to the remaining terminals of different magnetic heads. Preferably.

Further, in the primary side coil of the present invention, the primary side coil is formed into one substantially ring-shaped coil and disposed in the rotary transformer, and one end of the coil is connected to the one magnetic field. The head is connected to one terminal of the magnetic head, and the other terminal of the magnetic head is connected to one terminal of the other magnetic head. It is preferable that the terminal end of the terminal is connected to the other terminal of the coil.

Further, in the primary side coil, the above-mentioned 1
The secondary coil is formed into m substantially ring-shaped coils, and the secondary coils are arranged in the same concentric circle with respect to the secondary coil, and both ends of one coil of the primary coil are arranged. It is preferable that the terminals are connected to both terminals of the corresponding one of the magnetic heads.

In the primary coil, the circumference of the primary coil is divided into 360 / m degrees according to the number m of the magnetic heads, and the primary coil is arranged on the rotary transformer. It is preferable that both terminals of one divided coil are connected to both terminals of the corresponding one magnetic head, respectively.

Further, in the magnetic recording / reproducing apparatus of the present invention, a primary coil connected to the magnetic head and extending along at least part of the circumference, and a substantially ring-shaped coil connected to the recording / reproducing circuit. The rotary drum has a secondary side coil and a rotary transformer arranged to face each other. One set has n magnetic heads (n is 2 or more) and a plurality of m magnetic heads (m is 2 or more) are provided on the outer circumference of the rotary drum. A magnetic recording / reproducing apparatus in which a magnetic recording medium is slidably contacted with the rotating drum, the magnetic heads being arranged in a set at a predetermined interval for each of the magnetic heads so that two or more magnetic heads are not in sliding contact with the magnetic recording medium at the same time. In addition, the number of channels of the secondary coil is n, regardless of the number of channels of the primary coil.

In the structure of the primary side coil in the case where one set of magnetic heads comprises a plurality of magnetic heads, one magnetic head in each of the m sets is defined in any one of claims 2 to 5. The primary side coil and the magnetic head are connected in the same manner as the connecting configuration described above, and the primary side coil is arranged side by side in a concentric circle with n different radii on the rotary transformer. Preferably there is.

[0014]

In the magnetic recording / reproducing apparatus of the present invention, two or more magnetic heads are arranged on the rotary drum so as not to slide on the magnetic recording medium, for example, the magnetic tape at the same time. Only the magnetic head is transmitting the signal via the rotary transformer. For this reason,
By providing a rotary transformer corresponding to a magnetic head that is operating even if it is composed of a plurality of magnetic heads,
The number of channels of the secondary coil can be reduced, and since only one magnetic head is operating, the number of channels of the secondary coil can be one (claim 1).

In the primary coil of the present invention, as shown in FIG.
As shown in the explanatory view of (B), the circumferential length of the primary coil is divided into equal parts according to the number of magnetic heads, and both ends of one divided coil are separated. By connecting to the magnetic head, all the magnetic heads and the coils are connected in series, and the primary side coil can be configured by one channel (claim 2).

In the primary coil of the present invention,
As shown in the explanatory view of FIG. 6, the primary side coil is formed into one substantially ring-shaped coil, and both ends of this coil are connected to separate magnetic heads to connect the magnetic head and the coils in series. As a result, the primary side coil can be configured with one channel, and further, it is arranged inside the rotary transformer.
When the lead wires at both ends of the secondary coil are led out to the outside, for example, in the embodiment shown in FIG. 6, it is sufficient to pass through two lead holes, so that the manufacturing process is simplified (claim 3).

Then, as the primary side coils, substantially the same number of ring-shaped coils as the number of magnetic heads are formed. For example, when the number of magnetic heads is two, as shown in the explanatory view of FIG. 7B, two substantially ring-shaped coils are formed and arranged side by side, and each primary side coil is respectively arranged. Connect to the magnetic head. Then, the two coils are collectively arranged in one groove of the rotary transformer. In the present invention, 2 at the same time
Since one magnetic head is not operated, even if the primary side has a circuit configuration of two channels, the primary side rotary transformer can be configured with a groove for one channel (claim 4).

Further, as shown in the explanatory view of FIG.
By dividing the circumference of the primary side coil into equal parts according to the number of magnetic heads and arranging them on a rotary transformer, and connecting both ends of one divided coil to one magnetic head, Since the space of the primary coil of the rotary transformer is enough for one channel, the rotary transformer can be downsized (claim 5).

When switching between standard recording / reproducing and high-density recording / reproducing by changing the track width of the magnetic head, for example, one magnetic head is composed of two magnetic heads as shown in FIG. There is a need to. According to the present invention, in the case where the magnetic heads are composed of one set and two magnetic heads in this way, the magnetic heads of each set are mounted on the rotary drum so that two or more sets of magnetic heads do not come into sliding contact with the magnetic recording medium simultaneously. By arranging them, only the magnetic head in sliding contact transmits a signal via the rotary transformer.

As described above, in the magnetic head having a plurality of sets, by arranging the coils in concentric circles with different radii in parallel in the rotary transformer according to the number of the magnetic heads that are in sliding contact at the same time, The number of channels of the secondary coil and the secondary coil can be reduced (claim 6). For example, in FIG. 2, since there are two magnetic heads that are in sliding contact with the magnetic recording medium at the same time, the secondary side coil can be configured with two channels.

In the primary side coil of the magnetic head, which is composed of a plurality of sets, any one of the structures described in claims 2 to 5 is arranged side by side in concentric circles having different radii. As a result, the number of channels of the primary coil can be reduced, and the primary coil can have the same number of channels as the secondary coil (claim 7).

[0022]

EXAMPLES Examples of the present invention will be described below.

In general, the rotary drum is composed of two drums, an upper drum and a lower drum. The lower drum is fixed by attaching a magnetic head to the upper drum for rotation. The upper drum is provided with a magnetic head bar as a member for mounting the magnetic head, and the magnetic head bar is configured to rotate together with the upper drum.

FIG. 1 is a schematic plan view showing a connection state between a magnetic head and a rotary transformer according to the first embodiment of the present invention. In the case of switching between standard recording / reproducing and high density recording / reproducing by switching the magnetic head. 4 illustrates a 4-channel head in FIG. 1A is a schematic plan view of an upper surface portion of the primary side rotary transformer 5, and FIG. 1B is a schematic plan view of a lower surface portion. Actually, the magnetic head substrates 6 and 7 are fixed to the magnetic head bar, but the magnetic head bar is omitted in FIG.

The primary side rotary transformer 5 is fixed to a rotary drum (not shown). The tips of the magnetic heads 1 to 4 fixed to the magnetic head substrates 6 and 7 slightly project from the outer circumference of the rotary drum, and the tips of the magnetic heads 1 to 4 slide on a magnetic recording medium, for example, a magnetic tape to perform recording and reproduction. Be done. In the embodiment of the present invention, the magnetic head 1 and the magnetic head 2 are arranged on the outer circumference of the rotary drum on opposite sides of 180 degrees. Further, the winding angle of the magnetic tape on the rotary drum is set to 180 degrees or less.

FIG. 2A is a perspective view of the magnetic head substrate 6. A set of two magnetic heads 1 and 3 is fixed to the magnetic head substrate 6, and the conducting wire of the magnetic head 1 is fixed to the round terminals 1a and 1b formed on the substrate, and the magnetic head 3 of the magnetic head 3 is fixed. The lead wire is also round terminal 3a,
It is fixed to 3b. FIG. 2B is an enlarged view of the magnetic head portion. For example, the magnetic head 1 is a standard recording / reproducing head, and the magnetic head 3 is a high-density recording / reproducing head.

FIG. 3 is a vertical sectional view showing the structure of the rotary transformer. The rotor side primary coils 8 to 11 connected to the magnetic head and the stator side secondary coils 12 and 13 connected to the recording / reproducing circuit are shown, and the primary side coils 8 to 11 and the secondary side are shown. The coils 12 and 13 are arranged to face each other.

FIG. 4 is a circuit diagram showing the connection between the magnetic head and the rotary transformer in the first embodiment of the present invention. The terminal 1a of the magnetic head 1 is connected to the terminal 2b of the magnetic head 2 via the primary coil 8 of the rotary transformer 14, and the terminal 2a of the magnetic head 2 is connected to the terminal 1b of the magnetic head 1 via the primary coil 9. It is connected to the. The secondary coil 12 of the rotary transformer 14 is connected to a recording / reproducing circuit (not shown). The magnetic heads 3 and 4 are also the primary coil 1 in the same manner as above.
It is connected to 0 and 11 and a signal is transmitted through the secondary coil 13.

Next, the connection state of the rotary transformer and the magnetic head in one embodiment of the present invention will be described with reference to FIGS.

The primary coil 8 of the rotary transformer in FIG. 4 half-circulates in the groove provided on the lower surface of the primary rotary transformer 5 as shown in FIG. Is led out through the lead-out holes 8c and 8d. Figure 1
In (A), one terminal (8a in FIG. 4) of the primary coil 8 is connected to the terminal (1a in FIG. 4) of the magnetic head 1 provided on the magnetic head substrate 6 via the terminal 1a. . Further, the other end of the primary coil 8 (8b in FIG. 4) is connected to the magnetic head substrate 6 via the terminal 2b.
Is connected to a terminal (2b in FIG. 4) of the magnetic head 2 provided on the magnetic head substrate 7 arranged on the opposite side of the circumference by 180 degrees.

The primary coil 9 in FIG.
As shown in (B), the inside of the groove on the lower surface of the primary side rotary transformer 5 is half-circled on the side opposite to the primary side coil 8 and the lead-out holes 9c and 9d are formed.
Is led to the upper surface part. In FIG. 1A, one terminal (9b in FIG. 4) of the primary coil 9 is a terminal 1b.
Is connected to the terminal (1b in FIG. 4) of the magnetic head 1 via the terminal, and the other terminal (9a in FIG. 4) of the primary coil 9 is connected to the terminal (see FIG. 4) of the magnetic head 2 via the terminal 2a. 2a) in.

Primary coils 10 and 11 in FIG.
Is the primary coil 8 on the lower surface of the primary rotary transformer 5,
Half the circumference of the groove different from 9, and the primary side coil 8,
Similar to 9, the magnetic heads 3 and 4 are connected.

Next, the operation of this embodiment will be described.

Magnetic head 1 and magnetic head 2 in FIG.
And are arranged on the outer periphery of the rotary drum on the opposite side of 180 degrees. The winding angle of the magnetic tape on the rotating drum is set to 180 degrees or less. As a result, the magnetic head 1 and the magnetic head 2 do not slide on the magnetic tape at the same time.
Therefore, the signal detected by the magnetic head 1 is
It is transmitted to the recording / reproducing circuit through the primary side coil 8 and the secondary side coil 12 without being affected by the magnetic head 2.

Signals are also transmitted to the magnetic heads 2 to 4 through the rotary transformer without being affected by the other magnetic heads.

As described above, even in the four-channel magnetic head, the rotary transformer can be constructed by confronting two concentric grooves having different radii. Therefore, each of the primary coil and the secondary coil has two channels. It is possible to reduce the size of the rotary transformer and the rotary drum.

FIG. 5 is a partial circuit diagram in the first embodiment and an explanatory diagram showing the configuration of the magnetic head and the primary coil. FIG. 5A is a circuit diagram of the upper half of FIG. Is represented. In FIG. 5B, the magnetic heads 1 and 2 are arranged on the opposite sides of 180 degrees, and the primary coils 8 and 9 are arranged.
Shows a state in which the primary side rotary transformer 5 is divided into 180 degrees, and each half circle is arranged. In the figure, the number of magnetic heads is two, but when the number of magnetic heads is m, the primary side coil is divided into 360 / m degrees, and both ends of one divided coil are separated from each other. Connected to each head.

FIG. 6 is a circuit diagram showing a second embodiment of the present invention and an explanatory diagram showing the configuration.

In the figure, the primary side coil 17 is formed as one substantially ring-shaped coil and is arranged around the rotary transformer 14 once. The terminal 17a of the primary coil 17 is connected to the terminal 1a of the magnetic head 1, and the terminal 1a of this magnetic head 1 is connected.
b to the terminal 2b of the magnetic head 2 to connect the magnetic head 1,
2 are connected in series, and the terminal 2a of the magnetic head 2 is connected to the terminal 17b of the primary coil 17.

The magnetic head 1 and the magnetic head 2 are arranged on the outer periphery of the rotary drum on the opposite side of 180 degrees, as in the first embodiment. The winding angle of the magnetic tape on the rotating drum is set to 180 degrees or less. As a result, the signal detected by the magnetic head 1 is transmitted to the recording / reproducing circuit through the primary side coil 17 and the secondary side coil 12 without being affected by the magnetic head 2, and the primary side coil is used for one channel. Can be composed of In addition, since the lead-out holes 17c and 17d of the coil 17 are provided at two places, the manufacturing of the rotary transformer is simplified.

FIGS. 7A and 7B are a circuit diagram showing a third embodiment of the present invention and an explanatory diagram showing the configuration.

The primary side coils are formed into two substantially ring-shaped coils, and two primary side rotary transformers 5 are arranged side by side in one groove. Then, both ends of each of the primary coils 8 and 9 are connected to both terminals of the magnetic heads 1 and 2.

Similar to the first embodiment, the magnetic heads 1 and 2 are arranged on the outer circumference of the rotary drum on the opposite sides of 180 degrees. The winding angle of the magnetic tape on the rotating drum is set to 180 degrees or less.

The primary side coil is composed of two channels, but since the magnetic head 1 and the magnetic head 2 are not operated at the same time, the coils 8 and 9 are provided in one groove of the primary side rotary transformer 5. They can be arranged side by side, and the rotary transformer 14 can be configured by one channel.

FIGS. 7A and 7C are a circuit diagram showing a fourth embodiment of the present invention and an explanatory diagram showing the configuration.

The circumference of the primary side coil is divided into 180 degrees and arranged on the primary side rotary transformer 5, and both ends of the divided primary side coils 8 and 9 are connected to the magnetic heads 1 and 2, respectively. Connect to both terminals.

The magnetic head 1 and the magnetic head 2 are arranged on the outer circumference of the rotary drum on the opposite sides of 180 degrees, as in the first embodiment. The winding angle of the magnetic tape on the rotating drum is set to 180 degrees or less. Thereby, the primary side coil can be configured with one channel.

Although the second to fourth embodiments describe the two-channel magnetic head, the four-channel magnetic head is provided by providing the rotary transformer with two concentric grooves having different radii as in the first embodiment. It can be adapted to the head. Further, in the present invention, by reducing the winding angle of the magnetic tape, more magnetic heads can be arranged on the rotary drum, and a small number of rotary transformers can achieve multiple channels.

[0049]

As described above, according to the magnetic recording / reproducing apparatus of the present invention, a plurality of magnetic heads are arranged on the rotary drum so that two or more magnetic heads do not come into sliding contact with the magnetic recording medium at the same time. Only the magnetic head that is in sliding contact with and is operating transmits signals via the rotary transformer.
Therefore, since only one magnetic head is operating, the number of channels of the secondary coil is one. As a result,
The number of channels of the rotary transformer can be reduced with a simple configuration, and recording and reproduction can be performed with the rotary transformer having the number of channels smaller than the number of magnetic heads (claim 1).

In the second and fifth aspects, the circumference of the primary coil is divided into equal parts according to the number of magnetic heads, and the coils are arranged in the rotary transformer. This gives 1
The secondary coil can be configured with one channel, and the rotary transformer can be made even smaller.

Further, in the third aspect, the primary side coil is formed into one substantially ring-shaped coil, and the magnetic head and the coil are connected in series. Therefore, the primary coil can be configured by one channel, and the number of lead-out holes of the coil provided in the rotary transformer is small, so that the manufacturing process can be shortened.

Further, in the primary side coil of the fourth aspect, the same number of substantially ring-shaped coils as the number of magnetic heads are formed and the coils are arranged in parallel. Therefore, even if the circuit configuration is multi-channel, the rotary transformer can be provided with one channel, and the rotary transformer can be downsized.

According to the magnetic recording / reproducing apparatus of the present invention, in the case of a plurality of magnetic heads of one set, the magnetic heads of each set are prevented from slidingly contacting two or more sets at the same time with the magnetic recording medium. Is arranged on the rotary drum, and only the magnetic head that is in sliding contact with the magnetic tape and is operating transmits the signal via the rotary transformer. As a result, the number of channels of the secondary coil can be reduced, and a small rotary transformer and a small rotary drum can be realized (claim 6).

In the primary side coil of the magnetic head having a plurality of sets, any one of the structures described in claims 2 to 5 is arranged side by side in concentric circles having different radii. As a result, the number of channels of the primary coil can be reduced, and a smaller rotary transformer and a smaller rotary drum can be realized (claim 7).

[Brief description of drawings]

FIG. 1A is a schematic plan view showing a connection state of primary coils of a rotary transformer in a first embodiment of the present invention. (B) is a schematic plan view of the lower surface portion with respect to (A).

FIG. 2A is a perspective view of a magnetic head substrate.
(B) is a partially enlarged view of (A).

FIG. 3 is a vertical sectional view of a rotary transformer.

FIG. 4 is a circuit diagram showing a connection between a magnetic head and a rotary transformer in the first embodiment of the present invention.

FIG. 5A is a partial circuit diagram in the first embodiment. (B) is an explanatory view showing the configuration of (A).

FIG. 6A is a partial circuit diagram in the second embodiment. (B) is an explanatory view showing the configuration of (A).

FIG. 7A is a partial circuit diagram in another embodiment. (B) is an explanatory view showing a configuration of a third embodiment in the circuit diagram of (A). (C) is an explanatory view showing a configuration of a fourth embodiment in the circuit diagram of (A).

[Explanation of symbols]

1-4 magnetic head 5 primary side rotary transformer 6,7 magnetic head substrate 8-11 primary side coil (rotor side) 12,13 secondary side coil (stator side) 14 rotary transformer 1a, 1b, 2a, 2b magnetic Head terminals 8a, 8b, 9a, 9b, 17a, 17b Coil terminals

Claims (7)

[Claims] 1. A primary side coil connected to a magnetic head and extending along at least a part of a circumference, and a substantially ring-shaped secondary side coil connected to a recording / reproducing circuit are arranged to face each other. A magnetic recording / reproducing apparatus in which m (m is 2 or more) magnetic heads each having a rotating transformer are arranged at predetermined intervals on the outer circumference of a rotating drum, and a magnetic recording medium slides on the rotating drum. The two or more magnetic heads are arranged on the rotating drum so as not to come into sliding contact with the magnetic recording medium at the same time, and the number of channels of the secondary coil is equal to the number of channels of the primary coil. The magnetic recording / reproducing apparatus is characterized by being configured by one channel regardless. 2. The circumference of the primary side coil is divided into 360 / m degrees in accordance with the number m of the magnetic heads, the divided pieces are arranged in the rotary transformer, and one divided coil is formed. (8) One terminal (8a) is connected to one terminal (1a) of the magnetic head (1), and the one coil (8)
The other terminal (8b) is connected to one terminal (2b) of the other magnetic head (2), and the two terminals (9a, 9b) of the other divided coil (9) are also different. 2. The magnetic recording / reproducing apparatus according to claim 1, wherein the magnetic recording / reproducing apparatus is connected to the remaining terminals (2a, 1b) of the magnetic head. 3. The primary side coil is formed into one substantially ring-shaped coil and disposed on the rotary transformer, and one end (17a) of the coil is connected to one terminal (1a) of the magnetic head.
, The other terminal (1b) of the one magnetic head is connected to one terminal (2b) of the other magnetic head, and the m magnetic heads are sequentially connected in series, and the last magnetic field is connected. 2. The magnetic recording / reproducing apparatus according to claim 1, wherein the terminal end (2a) of the head is connected to the other end (17b) of the coil. 4. The primary side coil is formed into m substantially ring-shaped coils, and the primary side coils are arranged in parallel in the same concentric circle with respect to one secondary side coil. 2. The magnetic recording / reproducing apparatus according to claim 1, wherein both terminals of one coil are connected to both terminals of the corresponding one magnetic head, respectively. 5. The circumference of the primary side coil is divided into 360 / m degrees according to the number m of the magnetic heads and arranged in the rotary transformer, and one divided coil is provided. Both terminals of, to both terminals of the corresponding one of the magnetic head,
The magnetic recording / reproducing apparatus according to claim 1, wherein the magnetic recording / reproducing apparatus is configured to be connected to each other. 6. A primary side coil connected to a magnetic head and extending along at least a part of a circumference, and a substantially ring-shaped secondary side coil connected to a recording / reproducing circuit are arranged facing each other. A plurality of magnetic heads each having n (n is 2 or more) and m sets (m is 2 or more) each having a rotating transformer arranged on the outer periphery of the rotating drum at a predetermined interval. A magnetic recording / reproducing apparatus in which a magnetic recording medium slides on the rotating drum, wherein two or more sets of the magnetic heads are arranged on the rotating drum so as not to slide on the magnetic recording medium at the same time, and a secondary coil The magnetic recording / reproducing apparatus is characterized in that the number of channels is n regardless of the number of channels of the primary side coil. 7. The magnetic head according to claim 2, wherein one magnetic head in each of m sets is provided.
The primary side coil is connected to the rotary transformer in the same configuration as the secondary side coil and the magnetic head.
7. The magnetic recording / reproducing apparatus according to claim 6, wherein the magnetic recording / reproducing apparatus has a configuration in which they are arranged in concentric circles having different radii.