JPH11149601A - Rotary transformer and rotary head drum device using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rotary head drum device capable of multi-channelizing by a small diameter rotary drum and securing a crosstalk performance of simultaneous recording and reproducing. SOLUTION: This device is a rotary head drum device wherein a tape is made to run in diagonal contact with a rotary drum 2 and a fixed drum 3 for recording and reproducing, and a contact connector 12 using a coil spring is arranged on the rotor 8 of the rotary transformer for transmitting a signal to an underside of a magnetic head without contact so as to be opposed to a terminal 1b of the magnetic head 1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary head drum device used for a digital video tape recorder or a data streamer.

[0002]

2. Description of the Related Art Conventionally, a magnetic transformer is connected to a rotary transformer for transmitting electric signals to and from a recording / reproducing circuit of a rotary drum in a non-contact manner by connecting pins having windings of the rotary transformer to a flexible printed circuit board (hereinafter, referred to as a flexible printed circuit board). FPC), and the other end of the FPC is connected to a magnetic head using solder, or as described in JP-A-7-161004.
Phosphor bronze having a spring property is processed and arranged in a desired shape so as to face a terminal for soldering a winding of a magnetic head to secure contact. This example will be described with reference to the drawings. FIG. 9 is a sectional view of the vicinity of a magnetic head mounted on a rotating drum of a rotating head drum device, and FIG. 10 is a plan view of the same. The magnetic head 1 is mounted so as to protrude from the head window 2a of the rotating drum 2 by a predetermined amount, and transfers signals while contacting a tape (not shown) wound around the rotating drum 2. Phosphor bronze leaf spring 101 facing terminal 1a of magnetic head 1
Is arranged. The phosphor bronze 101 is soldered to the printed circuit board 103 for circuit, and the positioning member 1
02. The printed circuit board 103 for circuit
It is installed on a rotary transformer and is electrically connected to a conductor of a rotor of the rotary transformer. Usually, since the terminals 1a of the magnetic head 1 are arranged in the radial direction of the rotating drum, the leaf spring 101 made of phosphor bronze is generally arranged in a direction perpendicular to the radial direction of the rotating drum 2.

[0003]

As described above, when the rotary drum is mounted on the fixed drum, the use of a phosphor bronze spring extending from the rotary transformer eliminates the need for soldering after the mounting, which is excellent in assemblability. . However, it is necessary to increase the contact pressure to a certain degree in consideration of the set of the spring and the vibration resistance. Generally, several tens g or more per terminal is required. In order to secure this contact pressure, the thickness of the spring is also involved, but the length of the spring is generally required to be 3 mm or more, and this length has hindered downsizing of the drum and multi-channeling of the magnetic head. .

Further, in the case of a leaf spring type contact connector, since the volume occupied by the periphery of the magnetic head is large, there is a problem that electromagnetic waves leak from the recording head to the reproducing head and the crosstalk at the time of simultaneous recording and reproduction deteriorates. Was.

It is an object of the present invention to provide a small-sized rotary head drum device which solves the above-mentioned problems and which can be multi-channeled by a small-diameter rotary drum and capable of simultaneous recording and reproduction.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a rotary transformer having a reduced size of a contact connector in consideration of the above-mentioned problems of a conventional rotary head drum device. It is another object of the present invention to provide a rotary head drum device that can reduce the size of the rotary drum and / or increase the number of channels of the magnetic head by using the rotary transformer of the present invention.

[0007]

In order to solve the above-mentioned problems, the present invention according to claim 1 rotates around a predetermined axis,
A rotor having a groove, a stator having another groove opposing the groove on an opposing surface arranged at a predetermined interval on a surface of the rotor on which the groove is formed, and the rotor And a contact connector that rotates about the axis, and the rotor and the stator transmit an electric signal through a conductor formed in each of the groove portions,
The contact connector includes a coil spring, a hollow cylinder holding the coil spring inside, and a contact attached to a tip of the coil spring and electrically connected to the conductor formed in the groove. And a rotary transformer having:

The present invention according to claim 8 includes a rotary transformer according to the present invention, a rotary drum that rotates around the axis together with the rotor, and a magnetic head mounted on the rotary drum. A rotating head drum device electrically connected to the conductor formed in the groove via the contact connector.

Further, according to the present invention, there is provided a first rotary transformer having at least a first rotor and a first stator, and a second rotary transformer having at least a second rotor and a second stator. , A rotary drum, and a plurality of magnetic heads installed on the rotary drum and corresponding to one of the first rotary transformer and the second rotary transformer, wherein the first rotor, the second rotor And the rotary drum rotates together about the same axis, and the first rotary transformer and the second rotary transformer are disposed on the same axial side with respect to the rotary drum, The rotary transformer and / or the second rotary transformer is a rotary transformer of the present invention, and is a rotary head drum device.

[0010]

Embodiments of the present invention will be described below with reference to the drawings. It is to be noted that the same reference numerals are used for the same portions as those of the related art and portions common to the embodiments.

(First Embodiment) Hereinafter, a first embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a perspective view showing a configuration around a rotor of a rotary transformer according to a first embodiment of the present invention, and FIGS. 2 and 3 are magnetic heads and contacts of a rotary head drum device according to the first embodiment of the present invention. FIG. 4 is a cross-sectional view of the rotary head drum device according to the first embodiment of the present invention.

In FIG. 1, a conductor (not shown) for transmitting a signal is wound around a plurality of grooves 8a of a rotor 8 of a rotary transformer, and this conductor is soldered to a terminal 13a of a relay member 13. ing. A contact connector 12 made of a coil spring is disposed at a position away from the terminal 13a by a predetermined distance and at a position facing the terminal of the magnetic head. The configuration including the stator 9 shown in FIG. 4 in the above configuration is the rotary transformer according to the present embodiment.

As shown in FIG. 3, the contact connector 12 includes a coil spring 12a, a hollow cylinder 12b for holding the coil spring, and a contact 12 attached to the tip of the coil spring.
c.

Referring to FIG. 4, in a rotary head drum device according to the present embodiment, a magnetic head 1 bonded to a head base 1a is mounted around a rotary drum 2, and the rotary drum 2 is rotatable with respect to a fixed drum 3. It is arranged in. As a specific configuration, the rotating disk 4
Is shrink-fitted or press-fitted onto the rotating shaft 5,
Further, it is supported by a rolling bearing 7 attached to the fixed drum 3. The rotor 8 of the rotary transformer according to the present embodiment is attached to the rotating disk 4 below the rotation trajectory surface of the magnetic head 1, and is arranged at a position facing the terminal 1 b of the magnetic head 1. Further, the stator 9 of the rotary transformer according to the present embodiment is disposed on the fixed drum 3 so as to face the groove 8a of the rotor 8 of the rotary transformer.

By fixing the rotary drum 2 on which the magnetic head 1 is mounted to the rotary disk 4 with screws 6, signals from the recording / reproducing circuit of the drum unit of the rotary head and the magnetic head 1 can be transmitted in a non-contact manner. Becomes In addition, by using the positioning member 14 that holds the hollow cylinder 12b, it is possible to accurately ensure contact with the terminals of the magnetic head. With such a configuration,
The continuity between the magnetic head and the rotary transformer can be easily secured,
Moreover, since the area occupied by the contact connector is small, it is possible to cope with multi-channels.

Further, a contact connector using a coil spring is
Since the rotary transformer is attached to the relay member for soldering the conductor so as to face the terminals of the magnetic head, the number of components can be reduced.

The rotor and the stator according to the present invention are:
Although the present embodiment has been described as being cylindrical,
However, the present invention is not limited to this. For example, as shown in FIG. 11, a flat rotor 8 'attached to the end of the rotating shaft 5' and a stator 9 'attached opposite thereto may be used. In short, the rotor rotates around a predetermined axis and has a groove, and the groove is formed on a surface of the rotor where the groove is formed, and on an opposing surface that is arranged to face with a predetermined interval. What is necessary is just a stator having another opposed groove portion, and a rotor and a stator that transmit an electric signal through a conductor formed in each of the groove portions.

(Second Embodiment) Next, a second embodiment of the present invention will be described.
An embodiment will be described with reference to the drawings. FIGS. 5 and 6 are a plan view and a sectional view showing a contact connector of a rotary head drum device according to a second embodiment of the present invention. The rotary head drum device according to the present embodiment is the same as the rotary head drum device according to the above-described first embodiment except for the configuration of the contact connector. Therefore, in the present embodiment, the same reference numerals are given to the same components as those in the first embodiment, and the description will be omitted. Unless otherwise described, it is the same as the first embodiment.

In the rotary head drum device according to the present embodiment, as shown in FIGS. 5 and 6, a hollow tube 12b of a contact connector has a collar 12d having an outer diameter larger than its outer diameter.
And a part of the collar 12d is cut away.
The flange 12d is attached to the relay member 13 of the rotary transformer with reference to the surface on the side opposite to the contact 12c. Also, the collar 12d is mounted in a state where the cut-out portions of the collar 12d overlap in the radial direction of the rotating drum.
With such a configuration, the distance between the terminals of the magnetic head is short, and even when the contact connector is attached to the relay member, it is possible to perform soldering from the same direction, thereby improving workability. Further, the distance between the mounting reference surface and the magnetic head is shortened, so that downsizing is facilitated.

In the present embodiment, the notch portion of the collar according to the present invention has been described as two portions cut by two parallel strings across the center of a circle forming the collar. The shape and the number are not limited to this, and may be, for example, a short-cake-shaped partial circle cut out by two radii. In short, a part thereof is cut out, and a plurality of contact connectors are provided. In the case where there are a plurality of contact connectors, all or a part of the contact connector may be arranged so that a part of the notch portions overlaps with each other.

In addition, even if there is no notch in the collar of the present invention, soldering can be performed from the same direction, and the effect of improving workability can be obtained.

(Third Embodiment) Next, a third embodiment of the present invention will be described.
An embodiment will be described with reference to the drawings. FIG. 7 is a sectional view of a rotary head drum device according to a third embodiment of the present invention, and FIG. 8 shows a wiring state of a magnetic head on a rotary drum of the rotary head drum device according to the third embodiment of the present invention. It is a top view. The rotary head drum device according to the present embodiment is the same as the rotary head drum device according to the above-described first embodiment except that the rotary head drum device includes a plurality of rotary transformers and a plurality of magnetic heads.
Therefore, in the present embodiment, the same reference numerals are given to the same components as those in the first embodiment, and the description will be omitted. Unless otherwise described, it is the same as the first embodiment.

In the drum unit of the rotary head drum device according to the present embodiment, a magnetic head 1 adhered to a head base 1a is mounted around a rotary drum 2, and the rotary drum 2 is rotatably arranged with respect to a fixed drum 3. It was established. As a specific configuration, the rotating disk 4 is shrink-fitted or press-fitted and fixed to the rotating shaft 5, and furthermore, a rolling bearing 7 attached to the fixed drum 3.
It is supported by. A first rotary transformer having a cylindrical rotor 8 and a stator 9 is mounted below the rotation trajectory surface of the magnetic head 1 of the rotary disk 4, and the rotor is mounted on the same rotation axis as the rotor 8 of the first rotary transformer. A second rotary transformer having a cylindrical rotor 10 and a stator 11, which are spaced apart in the radial direction of a circle having a cross section perpendicular to the rotation axis of No. 8, is attached.

In the rotary head drum device according to the present embodiment, a rotary transformer having the same configuration as the rotary transformer according to the first embodiment is used as the first rotary transformer, and the first rotary transformer faces the terminal 1b of the magnetic head 1. Is arranged so that the contact connector 12 is located at the position. The wiring from the second rotary transformer to the magnetic head passes through the rotary drum 2 and the through holes 2b, 4b of the rotary disk 4, and is lifted to the upper part of the rotary drum 2. A through hole 2c is provided in the vicinity of the magnetic head 1 attached to the rotating drum 2, and a wire 2d is connected to the through hole 2c to connect to a wire above the rotating drum 2. The wiring 2d in FIG. 8 is connected from the top of the rotary drum 2, and the magnetic head perpendicular to the magnetic head is connected to the contact connector 12 of the rotary transformer 8 mounted on the rotary disk 4. In this case, the first
Are used for a reproducing head, and the second rotating transformer is used for a recording head or a recording head and an erasing head, and each of them is connected to a corresponding magnetic head, so that a reproducing signal level, a recording signal and an erasing signal are erased. Signals having signal levels as different as 70 dB can be handled simultaneously in a small-diameter drum, and the simultaneous recording / reproducing performance that is essential in a VTR for broadcasting business can be satisfied. Further, by covering the surface of the guide member 14 used for positioning of the contact connector 12 which is not in contact with the contact connector 12 with a conductive material, the simultaneous recording / reproducing performance is further improved. Further, by arranging a member made of a conductive material between the reproducing head, the recording head, and the erasing head, it is possible to obtain a level without any problem. Note that the conductive material is preferably copper or a copper alloy.

In the present embodiment, the first rotary transformer is used for a reproducing head, and the second rotary transformer is used for a recording and erasing head. However, the present invention is not limited to this, and may be reversed. .

In the first to third embodiments, the contact connector of the present invention has been described as being arranged so as to be in contact with the terminal of the substrate on which the magnetic head is installed. However, the present invention is not limited to this. For example, it may be electrically connected to the magnetic head via another terminal provided separately from the substrate.

In the first to third embodiments, the contact connector of the present invention has been described as being installed on the rotor via the relay member. However, the present invention is not limited to this. It may be installed directly on the rotor, or may be installed on another member that rotates synchronously with the rotor. In short, it only needs to rotate around the rotation axis of the rotor together with the rotor.

[0028]

As is apparent from the above description, the first aspect of the present invention can provide a rotary transformer having a reduced size of the contact connector.

Further, the present invention according to claim 8 can provide a rotary head drum device capable of reducing the size of the rotary drum and / or increasing the number of channels of the magnetic head.

Further, the present invention of claim 9 can provide a rotary head drum device capable of reducing simultaneous recording / reproducing crosstalk between a recording head and a reproducing head in addition to the invention of claim 8.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a configuration around a rotor of a rotary transformer according to a first embodiment of the present invention.

FIG. 2 is a plan view showing a connection relationship between a magnetic head and a contact connector of the rotary head drum device according to the first embodiment of the present invention.

FIG. 3 is a cross-sectional view showing a connection relationship between a magnetic head and a contact connector of the rotary head drum device according to the first embodiment of the present invention.

FIG. 4 is a cross-sectional view of the rotary head drum device according to the first embodiment of the present invention.

FIG. 5 is a plan view showing a contact connector of a rotary head drum device according to a second embodiment of the present invention.

FIG. 6 is a sectional view showing a contact connector of a rotary head drum device according to a second embodiment of the present invention.

FIG. 7 is a sectional view of a rotary head drum device according to a third embodiment of the present invention.

FIG. 8 is a plan view showing a wiring state of a magnetic head on a rotary drum of a rotary head drum device according to a third embodiment of the present invention.

FIG. 9 is a sectional view showing a leaf spring type contact connector for connecting a magnetic head and a rotary transformer of a conventional rotary head drum device.

FIG. 10 is a plan view showing a leaf spring type contact connector for connecting a magnetic head and a rotary transformer of a conventional rotary head drum device.

FIG. 11 is a perspective view showing a configuration of a modified example of the rotary transformer according to the first embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Magnetic head 1a Head base 1b Terminal 2 Rotating drum 2a Head window 2b, 2c Through hole 2d Wiring 3 Fixed drum 4 Rotating disk 4b Through hole 5 Rotating shaft 6 Screw 7 Rolling bearing 8 Rotor rotor 8a Groove 9 Rotor transformer stator DESCRIPTION OF SYMBOLS 10 Rotor of rotary transformer 11 Stator of rotary transformer 12 Contact connector 12a Coil spring 12b Hollow cylinder 12c Contact 13 Relay member 13a Terminal of relay member 14 Guide member 101 Leaf spring 102 Positioning member

Claims (14)

[Claims] 1. A rotor that rotates around a predetermined axis and has a groove, and a surface of the rotor where the groove is formed,
A stator having another groove portion facing the groove portion on an opposing surface arranged to face with a predetermined interval, and a contact connector that rotates around the axis together with the rotor, wherein the rotor and the stator are An electric signal is transmitted through a conductor formed in each of the grooves, and the contact connector is mounted on a coil spring, a hollow cylinder for holding the coil spring inside, and a tip of the coil spring. And
A rotary transformer comprising: a contact formed in the groove; and a contact electrically connected to the conductor. 2. The rotor is substantially a rotating body,
The rotary transformer according to claim 1, wherein the shaft is a rotary shaft of the rotating body, and the groove is formed on a rotating surface of the rotating body. 3. A plurality of said contact connectors, at least two of which are arranged substantially side by side in a plane perpendicular to said axis, radially and / or tangentially to a circle about said axis. The rotary transformer according to claim 1, wherein the rotary transformer is provided. 4. The cylinder has a circular flange at its outer periphery that is larger than the outer diameter of the cylinder, and is inserted into a hole formed in a predetermined mounting surface so that the collar contacts the mounting surface. The rotary transformer according to any one of claims 1 to 3, wherein the rotary transformer is in contact with and fixed to the rotary transformer. 5. A part of the brim is cut out, and when there are a plurality of the contact connectors, all or a part of the contact connector is formed such that a part of the cut parts overlaps with each other. The rotary transformer according to claim 4, wherein the rotary transformer is disposed in a position where 6. The contact connector is mounted on the mounting surface by a guide member formed on the mounting surface, and a portion of the surface of the guide member that is not in contact with the contact connector is electrically conductive. The rotary transformer according to any one of claims 1 to 5, wherein the rotary transformer is coated with a conductive material. 7. The rotary transformer according to claim 1, wherein the rotor has a relay member, and the contact connector is provided on the relay member. 8. A rotary transformer according to claim 1, further comprising: a rotary drum that rotates around said axis together with said rotor; and a magnetic head mounted on said rotary drum. A rotary head drum device electrically connected to the conductor formed in the groove via the contact connector. 9. A first rotary transformer having at least a first rotor and a first stator;
A second rotary transformer having a rotor and a second stator, a rotary drum, and a plurality of magnetic heads installed on the rotary drum and corresponding to one of the first rotary transformer and the second rotary transformer. Wherein the first rotor, the second rotor, and the rotary drum rotate together about the same axis, and the first rotary transformer and the second rotary transformer are arranged with respect to the rotary drum. ,
The said 1st rotary transformer and / or the said 2nd rotary transformer are arrange | positioned on the same side of the said axial direction, The said 1st rotary transformer.
A rotary head drum device, which is the rotary transformer according to any one of claims 1 to 7. 10. The magnetic head, wherein a plurality of magnetic heads are divided into a recording head and a reproducing head, the first rotary transformer is electrically connected to the recording head, and the second rotary transformer is The rotary head drum device according to claim 9, wherein the rotary head drum device is electrically connected to the reproducing head. 11. The magnetic head according to claim 1, wherein the plurality of magnetic heads are divided into a recording head, an erasing head, and a reproducing head.
10. The rotary head according to claim 9, wherein the rotary transformer is electrically connected to the recording head and the erasing head, and the second rotary transformer is electrically connected to the reproducing head. Drum equipment. 12. The rotary head drum device according to claim 10, wherein the recording head and / or the erasing head and the reproducing head are separated by a member made of a conductive material. 13. One of the first rotary transformer and the second rotary transformer, with respect to the other, is positioned radially inside a circle centered on the axis on a plane perpendicular to the axis. The wiring connecting the one rotary transformer and the corresponding magnetic head is arranged to pass through a through-hole of a rotary disk holding the rotary drum and a through-hole of the rotary drum, and 14. The rotary head drum device according to claim 10, wherein the rotary transformer is separated from another wiring connecting the rotary transformer and the corresponding magnetic head. 14. The magnetic head corresponding to the contact connector is mounted on the rotating drum via a substrate, and the contact of the contact connector is arranged to be in contact with a terminal of the substrate. The rotary head drum device according to any one of claims 8 to 13, wherein: