JPH09148159A - Non-contact signal transmission device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To dispense with a troublesome mounting of a coil and to make it possible to thin a non-contact signal transmission device by a method wherein a first support body is provided with first printed wiring parts, a second support body is arranged in opposition to the first support body and the second support body is provided with second printed wiring parts. SOLUTION: A rotor core 22 is provided with a housing 40 and a board 42 for circuit use and first printed wiring parts 46 are respectively formed in grooves 44 formed in the housing 40, while a stator core 24 has a housing 40 for transformer use, a board 52, second printed wiring parts 56 and the like. The housings 40 and 50 are formed of a magnetic material. The wiring parts 46 and the wiring parts 56 are respectively arranged in the grooves 44 and grooves 54 to make the wiring parts 46 and the wiring parts 56 oppose to each other. The wiring parts 46 respectively have first conductor patterns 60 and the patterns 60 are insulated from each other with an insulating layer. Second conductor patterns 70 of the wiring parts 56 are insulated from each other with an insulating layer to arrange. Thereby, the work of a winding is dispensed with and the reliability of a non-contact signal transmission device in view of a non-contact signal transmission operation is enhanced.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a non-contact signal transmission device for transmitting signals in a non-contact manner, and more particularly to a non-contact signal transmission device used for a rotary magnetic head device of a video tape recorder.

[0002]

2. Description of the Related Art An information recording / reproducing apparatus having a rotating portion and a fixed portion, for example, a rotary magnetic head device provided in a video tape recorder (VTR) has a rotating drum and a fixed drum. The rotating drum is adapted to rotate with respect to the fixed drum by driving a motor. One or more magnetic heads are set on this rotary drum, and when the magnetic head reads a video tape signal during playback of the video tape, the video tape is transferred to an external control unit via a rotary transformer and a fixed drum. Is supposed to convey information. When recording information on a video tape with a magnetic head, an external controller sends a signal corresponding to the information to the magnetic head via a fixed drum and a rotary transformer.

This type of rotary transformer comprises a rotor core and a stator core. The rotor core is attached to the rotary drum side and the stator core is attached to the fixed drum side. FIG. 11 shows a conventional rotary transformer 1, in which the rotary transformer 1 is a rotor core 2
And a stator core 3. The rotor core 2 is fixed to the rotating drum, and the stator core 3 is fixed to the fixed drum side. The rotor core 2 and the stator core 3 are
Both of them are disc-shaped, and the rotor core 2 has a transformer substrate 5 fixed to a phenol substrate 4. The stator core 3 has a transformer substrate 7 fixed to a phenol substrate 6.

Grooves 8 and 9 are concentrically provided in the transformer housings 5 and 7, respectively, and coils 8a and 9a are incorporated therein. The coil 8a is electrically connected to the magnetic head (video head) H via the soldered portion 4a of the phenol substrate 4. On the other hand, the coil 9a is electrically connected to the external control section C via the soldering section 6a of the phenol substrate 6. The rotor core 2 and the stator core 3 are arranged so as to face each other so that a predetermined gap GP is formed between the housings 5 and 7 in order to transmit a signal between the coils 8a and 9a in a non-contact manner.

[0005]

However, this type of flat-faced rotary transformer 1 has the following problems. The coils 8a and 9a are usually made of copper material having a circular cross section. To this end, the depth of the grooves 8, 9 is at least 1
It is necessary to be about mm or 1 mm or more. Therefore, the thickness of the housings 5 and 7 needs to be about 2.5 mm, and the total thickness of the housings 5 and 7 of the rotor core 2 and the stator core 3 needs to be at least 5.0 mm or more.
Moreover, the work of winding and disposing the coils 8a and 9a around the grooves 8 and 9 is very troublesome. Also coil 8
a and 9a require wiring to be led out and connected to the soldering part 4a of the phenol substrate 4 and the soldering part 6a of the phenol substrate 6, and the soldering process is troublesome and costly. It hangs.

When the coils 8a and 9a are fitted in the grooves 8 and 9 to be mounted as described above, the mechanical strength of the housings 5 and 7 is required. This is because when the coils 8a and 9a are mounted on the housings 5 and 7, cracks may occur if the housings 5 and 7 are thin. Therefore, as described above, the thickness of each of the housings 5 and 7 needs to be 2.5 mm or more.
Since the rotary magnetic head device as described above is required to be downsized, it is also necessary to downsize the rotary transformer 1. Therefore, the present invention has been made to solve the above problems, and an object of the present invention is to provide a non-contact signal transmission device that does not require a troublesome mount of a coil and can be thinned.

[0007]

According to the present invention, there is provided the above object between a conductor on one side and a conductor on the other side when a conductor on one side and a conductor on the other side relatively move. A non-contact signal transmission device for transmitting a signal in a non-contact manner, comprising: a first support made of a magnetic material; and a first printed wiring part provided on the first support and having a first conductor pattern. A second support body made of a magnetic material which is arranged so as to face the first support body made of a magnetic material, and a second support body which is provided so as to face the first printed circuit board. And a second printed wiring portion having a conductor pattern, which is achieved.

According to the present invention, the first support body made of a magnetic material has the first printed wiring portion. The second support body made of a magnetic material has a second printed wiring portion. When the first and second supports move relatively, the first conductor pattern of the first printed wiring part and the second conductor pattern of the second printed wiring part transmit signals in a non-contact manner. Is supposed to do.

By doing so, unlike the case where the coil is wound around the support and wiring is performed, even if the first support and the second support are thin, the first support and the second support are thin. The support can firmly hold the first printed wiring portion and the second printed wiring portion while maintaining their mechanical strength. Therefore, the width of the non-contact signal transmission device in the thickness direction or the axial direction can be reduced. Moreover, since the work of winding the coil is unnecessary, the processing cost can be reduced and the mass productivity can be improved.

[0010]

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

Embodiment 1 FIG. 1 is a plan view of a rotary magnetic head device of a video tape recorder equipped with a non-contact signal transmission device according to a first embodiment of the present invention, and FIG. 2 is a rotary magnetic head device thereof. FIG. 4 is a sectional view in the axial direction of FIG. First, the structure of this rotary magnetic head device will be described. In the rotary magnetic head device, the magnetic head H records a signal on the video tape or reproduces a signal on the video tape by rotating the rotary drum 10 while feeding the video tape in a predetermined direction. The rotary magnetic head device is an information recording / reproducing device for a recording / reproducing type video tape recorder, for example, and includes a rotating drum 10 and a fixed drum 12. The rotary drum 10 is also called an upper drum, and the fixed drum 12 is also called a lower drum.

A magnetic head H for recording / reproducing (or reproducing only, erasing only) is screwed to the rotary drum 10, for example. One or more magnetic heads H are set according to the type. Rotating drum 1
It is fixed to the flange 14 at 0. Flange 14
Are fixed to the upper end of the shaft 16 by press fitting. The rotor core 22 of the rotary transformer 20 is fixed to the lower portion of the flange 14 with an adhesive. Fixed drum 12
The cylindrical portion 12a of 2 is provided with two bearings 26, 26. The shaft 16 is rotatably supported by these bearings 26, 26. The motor M is, for example, a brushless motor, and the rotor yoke 30 of the motor M is fixed to the ring 32 by screws. The ring 32 fixes the lower end of the shaft 16 by press fitting. A drive coil 36, a drive circuit (not shown), and the like are formed on the stator substrate 34 of the motor M. On the other hand, the rotor yoke 3
Reference numeral 0 has a driving magnet 38. By energizing the drive coil 36 of the stator substrate 34, the rotor yoke 30, the shaft 16, the flange 14, and the rotary drum 10 are integrally rotated with respect to the fixed drum 12. Inside the fixed drum 12, the stator core 24 of the rotary transformer 20 is fixed with an adhesive or the like. A control unit 100 is connected to the stator board 34.

Next, the rotary transformer 20 will be described. The rotary transformer 20 is used as a non-contact signal transmission device for non-contact transmission of signals between the control unit 100 and each magnetic head H. The rotary transformer 20 is composed of a disk-shaped rotor core 22 and a stator core 24 as shown in FIGS. 2 and 3.

As shown in FIGS. 3 and 4, the rotor core 22
Has a hole 22h formed in the center, and similarly, a hole 24h is also formed in the center of the stator core 24. The rotor core 22 and the stator core 24 have holes 22h,
It is arranged concentrically with respect to the cylindrical portion 12a of FIG. 2 via 24h.

The rotor core 22 and the stator core 24 are both disk type and are arranged in a plane-opposing type as shown in FIG. 4, but unlike the conventional case, the use of circular coils is abolished. . That is, the rotor core 22 is
The housing 40 and the circuit board 42 are provided, and a first printed wiring portion 46 is formed in a groove 44 of the housing 40. On the other hand, the stator core 24 has a transformer housing 50, a substrate 52, a second printed wiring portion 56, and the like. The thickness W1 of the housing 40 and the thickness W2 of the housing 50 are each 1.5 m, for example.
m. The gap G between the housings 40 and 50 is, for example, about 0.2 mm. The housings 40 and 50 are made of a magnetic material, for example, soft ferrite.

The first printed wiring portion 46 and the second printed wiring portion 56 are arranged in the grooves 44 and 54 and face each other. The first printed wiring part 46 and the second
Each of the printed wiring portions 56 can employ the structure illustrated in FIG. The first printed wiring part 46 has a first conductor pattern 60. These first conductive wire patterns 60 are insulated by the insulating layer 61. Similarly, the second conductor pattern 70 of the second printed wiring part 56 is arranged insulated by the insulating layer 71. The first conductor pattern 60 and the second conductor pattern 70 have the number of conductors corresponding to the number of channels of the magnetic head.

The first conductive wire pattern 60 is electrically connected to a predetermined circuit portion of the substrate 42 via a lead-out portion 62 as shown in FIG. The lead-out portion 62 passes through a through hole 40a formed in the housing 40. Similarly, the second conductor pattern 70 is electrically connected to a predetermined circuit portion of the substrate 52 via the lead-out portion 72 of FIG. The lead-out portion 72 is provided in the housing 50.
Through the through hole 50a. Then, a predetermined circuit portion of the substrate 42 is electrically connected to the magnetic head H. Further, a predetermined circuit portion of the board 52 is connected to the control unit 100 described above.

FIG. 6 shows the rotary transformer 20 described above.
And the connection relationship between the magnetic head H and the control unit 100 is shown in a simplified manner. When the magnetic head H records information on the video tape T, the control section 100 sends a signal to the second printed wiring section 56 of the stator core 24, and the second printed wiring section 56 makes the first printed wiring section 56 first. The signal is transmitted to the printed wiring portion 46 by a magnetic action in a non-contact manner. Then, the first printed wiring part 46
The signal obtained in step 3 acts on the magnetic head H, and the magnetic head H records information on the video tape T.

On the contrary, when the information on the video tape T is reproduced by the magnetic head, the signal obtained by the magnetic head H from the video tape T is transmitted to the first printed wiring portion 46 and the first printed wiring portion 46. Transmits a signal by magnetic action in a non-contact manner with respect to the second printed wiring part 56. The second printed wiring section 56 can send the obtained signal to the control section 100 and reproduce the signal of the video tape T.

Next, the operation of the rotary magnetic head device shown in FIGS. 1 and 2 will be briefly described. When the motor M is driven,
The rotating drum 10 rotates about the shaft 16 with respect to the fixed drum 12. As a result, the magnetic head H records information on the video tape T moving in contact with the fixed drum 12 and the rotating drum 10 by a helical scan method, or the magnetic head H reproduces the information on the video tape T. It has become.

When the magnetic head H records information on the video tape T, a signal from the control unit 100 passes through the circuit portion of the stator substrate 34 and then the rotary transformer 2.
0 of the stator core 24 is sent to the second printed wiring portion 56 shown in FIG. Then, non-contact exchange of recording signals is performed between the second printed wiring portion 56 and the first printed wiring portion 46. In this case, the rotor core 22
Are rotating with respect to the stator core 24. When the first printed wiring portion 46 of the rotor core 22 receives the signal for recording, the signal is sent to the magnetic head H, and the magnetic head H records the signal on the video tape T.
On the contrary, when the magnetic head H reproduces the information recorded on the video tape T, the reproduction signal obtained by the magnetic head H is transmitted to the first printed wiring portion 46 of the rotor core 22 of FIG. The first printed wiring portion 46 transmits the reproduction signal to the second printed wiring portion 56 in a non-contact manner.
When the second printed wiring unit 56 receives the reproduction signal, it sends the reproduction signal to the control unit 100, so that the control unit 100 can reproduce a predetermined image and sound based on the reproduction signal.

Next, another embodiment of the present invention will be described with reference to FIG. The embodiment of FIG. 7 is a modification of the embodiment of FIG. In the first embodiment shown in FIG. 4, as shown in FIG. 4, the first printed wiring portion 46 is arranged in the groove 44 of the housing 40, and the second printed wiring portion 56 is arranged in the groove 54 of the housing 50. ing. In the embodiment shown in FIG. 7, this groove is omitted and the first printed wiring portion 46 is arranged directly on the lower surface of the housing 140 by adhesion. Similarly, the second printed wiring part 56
It is directly formed on the upper surface of the housing 150 by adhesion.

Then, these first printed wiring parts 46
The second printed wiring portion 56 and the second printed wiring portion 56 are the same as the first printed wiring portion 46 and the second printed wiring portion 56 of FIG.
2, 172 are electrically connected. In other respects, the embodiment of FIG. 7 is the same as the embodiment of FIG. By doing so, it is not necessary to form a groove in the housing, so the number of processing steps can be further reduced and the cost can be reduced. By the way, the thickness of the first printed wiring portion 46 and the second printed wiring portion 56 of the above-described embodiment is thin, for example, about 30 μm, and the thicknesses W1 and W2 of the housings 40 and 50 themselves are very thin. The axial thickness of the rotary transformer 20 can be made as small as possible.

Second Embodiment FIGS. 8 to 10 show a second embodiment of the present invention.
FIG. 8 shows a rotary magnetic head device for a video tape recorder including a rotary transformer 220 which is a non-contact signal transmission device according to the second embodiment of the present invention.

In FIG. 8, the rotary magnetic head device includes an upper drum 201, a middle drum (rotating drum) 202, a flange 203, a lower drum 204, a drum support 205, a rotary transformer 220, a drum shaft 207, a motor 208, and a power supply device. 209 and so on. The upper drum 201 is
Drum cover 201b via stator holder 201a
It is connected to the. A power supply device 209 is provided in the stator holder 201a and the drum cover 201b. The drum shaft 207 is fixed to the flange 203. The drum shaft 207 is rotatably supported by the lower drum 204 via bearings 207, 207. The flange 203 is provided integrally with the middle drum 202. The middle drum 202 is a rotating drum, and the magnetic head H and the rotor core 211 of the rotary transformer 206 are attached thereto. The stator core 212 of the rotary transformer 206 is fixed to the stator holder 201a.

The rotary transformer 206 includes the rotor core 2
11 and the stator core 212, the signals are exchanged in a non-contact manner. The rotary transformer 206 transmits the recording signal to the magnetic head H in a non-contact manner when recording the signal onto a video tape (not shown), and the signal obtained from the magnetic head H during the reproduction. It is designed to be transmitted to an external control unit in a non-contact manner.

The motor 208 includes a stator portion 208a and a rotor portion 208b, and when the coil 208c is energized, the rotor portion 208b rotates with respect to the stator portion 208a. The rotation of the rotor portion 208b causes the drum shaft 207 and the middle drum 202 to rotate with respect to the lower drum 204 and the upper drum 201. As a result, the magnetic head H records a signal on the video tape by a helical scan method or reproduces information on the video tape.

Unlike the first embodiment, the rotary transformer 220, which is a non-contact signal transmission device, has a cylindrical rotor core 211 and a cylindrical stator core 212 as shown in FIG.
It has. The outer diameter of the cylindrical rotor core 211 is set smaller than the inner diameter of the stator core 212.
As a result, the first printed wiring portion 2 of the rotor core 211 is
A gap G is formed between 46 and the second printed wiring portion 256. This gap G is, for example, 0.
It is about 2 mm. The first printed wiring part 246 is arranged on the outer peripheral surface of the rotor core 211 as shown in FIGS. 9 and 10. The first printed wiring portion 246 has the same structure as the above-mentioned first printed wiring portion 46,
The first conductor pattern 260 and the insulating layer 261 are provided.

The first printed wiring portion 246 of the rotor core 211 is arranged on the outer peripheral surface of the cylindrical housing 240, while the substrate 242 is arranged on the inner peripheral surface of the housing 240. And the first conductor pattern 2
60 is connected to a predetermined wiring portion of the substrate 246 via the lead-out portion 262. The lead-out portion 262 is arranged in the through hole 240 a of the housing 240. The housing 250 of the stator core 212 has a first inner peripheral surface with a first
The printed wiring portion 256 is disposed, and the substrate 252 is disposed on the outer peripheral surface thereof. The second conductor pattern 270 is electrically connected to a predetermined wiring portion of the substrate 252 via the lead-out portion 272. The lead-out portion 272 is arranged in the through hole 250a.

The substrate 242 is electrically connected to the magnetic head H, and the substrate 252 is connected to the controller 100. As a result, signals can be exchanged between the magnetic head H and the controller 100 via the rotary transformer 220 without contact.

As described above, in the embodiment of the present invention, as the non-contact signal transmission device, for example, the rotary transformer of the rotary magnetic head device is described as an example.
In this rotary transformer, it was abolished that it was necessary to wind a copper wire with a circular cross section in the groove of the housing in the past, and by printing a copper foil on the housing made of magnetic material, That is, by forming the printed wiring portion, as a result, the thickness in the axial direction can be reduced in the first embodiment shown in FIG. 9 and 10
In the embodiment, the diametrical thickness of the rotary transformer can be reduced.

Moreover, since the winding work which has been conventionally required is not necessary, the number of working steps and the cost can be reduced, and the method of using the printed wiring board of the present invention is not suitable as compared with the method of arranging the coil in the groove. The reliability of the contact signal transmission operation can be improved. In addition, the thickness of the housing, which is the first support and the second support made of magnetic material, can be reduced, so that the weight of the rotary transformer can be reduced. When connecting the first printed wiring part and the second printed wiring part to the substrate of the housing, by electrically connecting them through the through hole of the housing, a part of the coil that has been conventionally required This eliminates the need for the work of leading the substrate to the outside and connecting it to the substrate, thus reducing the number of processing steps and cost.

The present invention is not limited to the above embodiment. The non-contact signal transmission device of the present invention can be applied not only to the rotary magnetic head device of the video tape recorder described above but also to a rotary magnetic head device such as an audio tape recorder (DAT). Further, the non-contact signal transmission device of the present invention is not limited to being applied to an information recording / reproducing device such as a video tape recorder, but can of course be applied to other fields.

[0034]

As described above, according to the present invention,
A cumbersome mount for the coil is not required, and the thickness can be reduced.

[Brief description of the drawings]

FIG. 1 is a plan view showing a rotary magnetic head device for a video tape recorder provided with a first preferred embodiment of a non-contact signal transmission device of the present invention.

FIG. 2 is an axial sectional view of the rotary magnetic head device of FIG.

3 is a perspective view showing an example of a rotary transformer provided in the rotary magnetic head device of FIG.

FIG. 4 is a cross-sectional view showing the structure of the rotary transformer of FIG.

FIG. 5 is an enlarged sectional view showing a part of the rotary transformer of FIG.

FIG. 6 is a diagram simply showing a connection relationship between a magnetic head, a rotary transformer, and a control unit.

FIG. 7 is a sectional view showing another embodiment of the rotary transformer of the present invention.

FIG. 8 is an axial cross-sectional view showing a rotary magnetic head device for a video tape recorder provided with a second embodiment of the non-contact signal transmission device of the present invention.

9 is a diagram showing a rotary transformer provided in the rotary magnetic head device of FIG.

FIG. 10 is an enlarged sectional view showing a part of the rotary transformer of FIG.

FIG. 11 is a sectional view showing an example of a conventional rotary transformer.

[Explanation of symbols]

20 rotary transformer (non-contact signal transmission device) 22 rotor core 24 stator core 40 housing (first support body) 40a, 50a through hole 42, 52 substrate 46 first printed wiring part 50 housing (second support body) 56th 2 printed wiring part 60 1st conductor pattern 61,71 insulating layer 70 2nd conductor pattern 100 control part G gap H magnetic head

Claims (7)

[Claims] 1. A non-contact signal transmission device for transmitting a signal in a non-contact manner between a conductor on one side and a conductor on the other side when a conductor on one side and a conductor on the other side relatively move. A first support made of a magnetic material, a first printed wiring part provided on the first support and having a first conductor pattern, and arranged to face the first support made of a magnetic material A second support body made of a magnetic material, and a second printed wiring part provided on the second support body so as to face the first printed circuit board and having a second conductor pattern. A non-contact signal transmission device characterized by: 2. The first printed wiring portion is arranged in the groove of the first support body, and the second printed wiring portion is arranged in the groove of the second support body. Non-contact signal transmission device. 3. The first support and the second support are disc-shaped, and the first support is adapted to rotate with respect to the second support. Non-contact signal transmission device. 4. The first support is set on the rotary drum side of a rotary magnetic head device for recording and reproducing information on a tape-shaped recording medium, and the second support is fixed to the rotary magnetic head device. The non-contact signal transmission device according to claim 3, wherein the non-contact signal transmission device is set on the drum side. 5. The first support and the second support are cylindrical, the first support is concentrically arranged inside the second support, and the first support is the second support. The non-contact signal transmission device according to claim 1, which is adapted to rotate with respect to the support. 6. The first support is set on the rotary drum side of a rotary magnetic head device for recording and reproducing information on a tape-shaped recording medium, and the second support is a fixed drum of the rotary magnetic head device. The non-contact signal transmission device according to claim 5, which is set on the side. 7. The first conductor pattern is electrically connected through a through hole of the first support, and the second conductor pattern is electrically connected through a through hole of the second support. The non-contact signal transmission device according to.