JPH08315334A - Rotary magnetic head device - Google Patents

Abstract

PURPOSE: To decrease the number of parts and to drastically decrease man-hours by providing a rotary magnetic head device with a flexible wiring board for electrically connecting the lead wires of the coil of a rotating side rotary transformer core and a magnetic head. CONSTITUTION: A coil holder 11 as a holding means is fixed to the rear surface of a rotor core 6a. This coil holder 11 hooks and holds the lead wires 12 extending from the coil of the rotor core 6a. The lead wires 12 are positioned by the coil holder 1 with a recessed part which is the reference for the phase of the rotor core 6a as a reference. The lead wires 12 are held under the guide of the coil holder 11 and are drawn out in a specified direction (for example, nearly the radial direction of the rotor core 6a). The treatment of the lead wires 12 extending from the coil of the rotor core 6a involves merely hooking and holding of the lead wires 12 to the coil holder 11 without requiring the work to solder the lead wires to a terminal board, etc., in such a manner, thereby, the production cost of the rotor core is reduced.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary magnetic head device suitable for use in, for example, a video tape recorder (VTR), an 8 mm video tape recorder, a digital audio tape recorder (DAT), a data streamer, and the like.

[0002]

2. Description of the Related Art FIG. 12 is an assembled sectional view of a conventional rotary magnetic head device, and FIG. 13 is a plan view showing a magnetic head of this rotary magnetic head device. In FIG. 12, a cylindrical rotary drum 402 is rotatable with respect to the fixed drum 401. A magnetic head 403 shown in FIG. 13 is attached to the head supporting surface 402e at the lower edge of the rotary drum 402 so that the tip projects from the outer periphery. As shown in FIG. 13, the magnetic head 403 includes a head base 403a, a head chip 403b, and a thin film substrate 403c, and the head chip 403b and the thin film substrate 403c are electrically connected by soldering or the like. The fixed drum 402 is provided with a bearing 405, and the rotating shaft 404 is rotatably supported by the bearing 405. The rotating shaft 404 and the rotating drum 402 are fixed by overheat fitting or press fitting. A motor driving unit is provided below the rotary shaft 404. The power of this motor drives the rotary shaft 402 and the rotary drum 402 to rotate.

The rotary transformer 406 has a stationary stator core 406b and a rotating rotor core 406a. The stator core 406b is fixed to the fixed drum 401 by adhesion or the like. The rotor core 406a is
It is fixed to the rotary transformer support surface 402b of the rotary drum 402 by adhesion or the like. This rotor core 406
The a is opposed to the stator core 406b at a constant distance in a plane. Terminals 407 and 408
Are terminals in which the conductive material is covered with a non-conductive material such as resin. These terminals 40
Reference numerals 7 and 408 denote the magnetic head 403 and the rotor core 406a.
Make an electrical connection between. The printed circuit board 409 is mounted on the upper surface of the rotary drum 402. Terminal 4
Reference numeral 07 designates a hole 402c and a hole 4 formed in the rotary drum 402.
09a, and is fixed on the rotor core 406a. Moreover, one end of the terminal 407 has a rotor core 406.
It is soldered to the winding a and the other end of the terminal 407 is soldered to the conductive pattern on the printed board 409. The terminal 408 is attached to the hole 402d formed in the rotary drum 402 and the hole 409b of the substrate 409, and one end of the terminal 408 is attached to the thin film substrate 40 of the magnetic head 403.
3c (see FIG. 13) is soldered to the terminal 408.
The other end is soldered to a conductive pattern on the printed board 409. Thus, the rotor core 406a and the magnetic head 403 are connected to the terminal 407 and the printed circuit board 409.
The upper conductive pattern and the terminal 408 are electrically connected to each other.

[0004]

The conventional rotary magnetic head device as described above has the following problems. To electrically connect the rotor core 406a and the magnetic head 403,
Two terminals 407 and 408 and a printed circuit board 409 for relay are required. Therefore, in the conventional rotary magnetic head device, not only the number of parts is large, but also the number of soldering points is large, and the holes 402c, 402d, 409a, 409b formed in the rotary drum 402 and the printed board 409 are increased.
On the other hand, workability is poor, such as the work of passing the terminals 407 and 408 through. Further, the lead wire of the rotor core 406a requires a troublesome work such as a process of soldering the terminal portion of the terminal 407.

Therefore, the present invention has been made to solve the above problems, and an object of the present invention is to provide a rotary magnetic head device capable of reducing the number of parts, drastically reducing the man-hours and reducing the cost. .

[0006]

According to the invention of claim 1, the above-mentioned object is supported by a fixed drum, a rotary drum coaxially rotating with respect to the fixed drum, and a rotary drum. A magnetic head and a fixed rotary transformer core that is set on a fixed drum to transmit a signal reproduced by the magnetic head in a non-contact manner or to transmit a signal to the magnetic head in a non-contact manner, and Achieved by a rotary magnetic head device including a rotary transformer having a rotary rotary transformer core set on a drum, and a flexible wiring board for electrically connecting a lead wire of a coil of the rotary rotary transformer core and a magnetic head To be done. In the invention of claim 2, the lead wire of the coil is preferably held by the holding member. In the invention of claim 3, the holding member is preferably arranged on the surface of the rotary rotary transformer core on the rotary drum side. In the invention of claim 4, preferably, the holding means presses and fixes the land portion of the flexible wiring board and the lead wire of the coil to the surface of the rotary drum. In the invention of claim 5, preferably, the solder portion of the land portion of the flexible wiring board for connecting the lead wire of the coil is thickened.

[0007]

According to the first aspect of the invention, since the lead wire of the coil of the rotary transformer core on the rotating side is connected to the magnetic head by the flexible wiring board, a plurality of terminals as in the prior art and a print for relay are used. No board is required, and there are few soldering points and electrical connection is easy.
According to the inventions of claims 2 and 3, since the lead wire of the coil of the rotary transformer core on the rotating side need only be held by the holding member, the work is simple. According to the invention of claim 4, the land portion of the flexible wiring board and the lead wire of the coil only have to be pressed and fixed to the surface of the rotary side rotary transformer core of the rotary drum. According to the invention of claim 5, by increasing the thickness of the solder portion of the land portion of the flexible wiring board, soldering can be performed without requiring additional solder.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of the present invention will be described in detail below with reference to the accompanying drawings. The examples described below are
Since it is a preferred specific example of the present invention, various technically preferable limitations are attached, but the scope of the present invention is, unless otherwise stated to limit the present invention, in the following description.
It is not limited to these modes.

Embodiment 1 FIG. 1 is an axial sectional view showing a preferred embodiment 1 of the rotary magnetic head device of the present invention. FIG. 2 is a plan view showing an example of a magnetic head attached to the rotary magnetic head device of FIG. 3 is a bottom view showing a state in which a flexible wiring board is arranged on the bottom surface of the rotor R of the rotary magnetic head device of FIG. 1, FIG. 4 is a cross-sectional view of the rotor R of FIG. 3, and FIG. It is a top view of a transformer core.

Referring to FIG. 1, a rotary magnetic head device according to a first embodiment of the present invention includes a rotor R, a stator S, and a motor M.
have. The rotary drum 2 of the rotor R of FIG.
Is fixed against. One or a plurality of magnetic heads 3 (three magnetic heads 3 are shown in FIG. 3) are attached to the head supporting surface 2e of the rotary drum 2, and the tip of the magnetic head 3 is attached to the rotary drum 2. It is designed to project beyond the outer periphery of the. Support surface 2 of rotating drum 2
A rotary-side rotary transformer core (hereinafter referred to as a rotor core) 6a of the rotary transformer 6 is fixed to b by adhesion or the like. On the other hand, the fixed drum 1 of the stator S
A fixed-side rotary transformer core (hereinafter referred to as a stator core) 6b of the rotary transformer 6 is fixed to the support surface 1a of the device by adhesion or the like. Coils are arranged in the grooves of the rotor core 6a and the stator core 6b, respectively, and the coils of the rotor core 6a and the stator core 6b are arranged so that the rotor core 6a and the stator core 6b have a fixed shape in order to exchange signals in a non-contact manner. They face each other with a gap. The two bearings 5 and 5 of the fixed drum 1 are
The shaft 4 of the rotor R is rotatably supported. Motor M
Is a motor for rotating the shaft 4. The rotary drum 2 integrated with the shaft 4 by driving the motor M
Are adapted to rotate with respect to the fixed drum 1.

The magnetic head 3 shown in FIG.
The head chip 3b and the thin film substrate 3c are electrically connected to each other by soldering or the like. The thin film substrate material 3c has connecting portions 15 and 16.

The features of the first embodiment shown in FIG. 1 are as follows. That is, the lead wire 12 (12a, 12b) of the coil of the rotor core 6a shown in FIG. 5 and the thin film substrate 3c of the head chip 3b shown in FIG. 2 are electrically connected via a flexible wiring board (also referred to as a flexible wiring board) 10. Is connected to.

As shown in FIGS. 3 to 5, the flexible wiring board 10 is a wiring board that is normally used and is formed of a thin resin sheet that is easily deformed. On the surface of the flexible wiring board 10 of FIG. 3, a wiring pattern 1 for transmitting a signal of the head chip 3b is formed.
3, 14 are formed. These wiring patterns 13,
The lands 13a and 14a at one end of the rotary drum 2 are
When the flexible wiring board 10 is set with respect to the connection parts 15 and 16 of the thin film substrate 3c of the magnetic head 3 of FIG.
(See FIG. 2) are electrically connected to each other by soldering.

As shown in FIGS. 1 and 5, the rotor core 6a
On the back surface (upper surface) of the coil holder 1 as holding means
1 is fixed. The coil holder 11 is for hooking and holding the lead wire 12 extending from the coil of the rotor core 6a. The lead wire 12 is positioned by the coil holder 11 with reference to the recess 17 that serves as a reference for the phase of the rotor core 6a. Lead wire 1
2 is held by the guides 20, 21, 22 of the coil holder 11 and is drawn out in a fixed direction (for example, a substantially radial direction of the rotor core 6a). Thus, the rotor core 6a
In order to process the lead wire 12 extending from the coil, it is only necessary to hook the lead wire 12 on the coil holder 11 and hold the lead wire 12 without the need for soldering work to a terminal plate or the like, thereby reducing the manufacturing cost of the rotor core. . The coil holder 11 is adapted to connect and position the lead wire 12 extending from the coil of the rotor core 6a of FIG. 5 and the lands 13b and 14b of the flexible wiring board 10 of FIG.

6 and 7 show a state in which the rotor core 6a is fixed to the rotary drum 2 of the rotor R. As shown in FIG.
The rotor core 6a has a plurality of concentric grooves 6H,
The coil is fitted in the groove 6H. Similarly, the stator core 6b also has a plurality of concentric grooves, and the coil is fitted in the grooves. 6 and 7, the upper surface of the rotor core 6a (the surface in which the groove is not formed as shown in FIG. 5) is arranged so that the reference hole 18 of the rotary drum 2 and the reference concave portion 17 of the rotor core 6a are in phase with each other. It is fixed to the supporting surface 2b of the rotating drum 2 with an adhesive or the like. Thereby, the convex portion 1 of the coil holder 11 of FIG.
9 is the wiring patterns 13 and 1 of the flexible wiring board 10.
4 can be pressed against the back surface 2a of the rotary drum 2 to keep the land portions 13b and 14b at one end thereof from floating, and the lead wires 12a of the rotor core 6a shown in FIG.
12b is positioned with respect to the land portions 13b and 14b. That is, the land portions 13b and 14b of the flexible wiring board 10 and the lead wires 12a and 12b are electrically connected while ensuring the maximum space between the back surface 2a of the rotary drum 2 and the top surface of the rotor core 6a in FIG. it can. Therefore, the lead wire of the coil of the rotor core 6a and the head chip 3b can be electrically and reliably connected.

In the state shown in FIG. 7, the lead wires 12a and 12b of the rotor core 6a are landed on the land portion 13 with a soldering iron tip.
b, 14b, the lead wires 12a, 12
b is soldered by the solder-plated portions of the land portions 13b and 14b, and the head chip 3b and the rotor core 6 of FIG.
a is electrically connected. At this time, the solder plating thickness of the lands 13b, 14b of the flexible wiring board 10 is positively made thicker than a predetermined thickness, so that the lead wires 12a, 12b are soldered to the lands 13b, 14b. Since the soldering work can be performed without adding the solder by the bar solder, the solder workability is improved. Moreover, since no solder is added, variations in the rotational balance of the rotary drum 2 can be suppressed.

The rotary drum 2 assembled in this manner is incorporated into the fixed drum 1 shown in FIG.
Are rotatably supported by bearings 5 and 5. Then, the motor M is set on the shaft 4. By driving the motor M, the rotary drum 2 is rotated by the bearings 5 and 5 of the fixed drum 1 via the rotary shaft 4. When the magnetic head 3 is, for example, a recording head, information is recorded on a VTR tape in a predetermined recording track pattern by a helical scan method. When the magnetic head 3 is a reproducing head, the magnetic head 3 reproduces information along the recording track recorded on the tape by the helical scan method. Alternatively, when the magnetic head 3 is an erasing head, the magnetic head 3 erases the information recorded on the tape by the helical scan method.
When the magnetic head 3 records information on the tape, a signal is given to the stator core 6b from the external control means, and this signal is transmitted from the stator core 6b to the rotor core 6a in a non-contact manner. Then, the signal is transmitted from the rotor core 6a to the magnetic head 3 via the flexible wiring board 10. When reproducing the information on the tape, conversely, the reproduction signal obtained by the magnetic head 3 is transmitted to the external control means via the flexible wiring board 10 and the rotary transformer 6.

Embodiment 2 FIG. 8 shows Embodiment 2 of the rotary magnetic head device of the present invention. In the rotor R of the second embodiment of FIG. 8, the rotor core 6 a of the rotary transformer is attached to the rotary drum 52. The coil lead wire 12 of the rotor core 6a is
It is connected to a contact member 53 made of sheet metal. The contact member 53 is attached to the holding member 54, and the contact member 53 is connected to the flexible wiring board 10 by solder 55 by soldering. By doing so, the flexible wiring board 10 and the lead wire 12 can be easily connected. The structure of the stator, the motor, and the magnetic head of the second embodiment shown in FIG. 8 is the same as that shown in FIG.

Third Embodiment FIG. 9 shows a third embodiment of the present invention. The rotary drum 72 of the rotor R has a rotor core 6a. The coil lead wire of the rotor core 6a is connected to the flexible wiring board 1.
The flexible wiring board 10A is soldered to another flexible wiring board 10A on the holding member 74 for pressing 0 onto the back surface of the rotary drum 72. The flexible wiring board 10A and the flexible wiring board 10 are connected by solder 75. The space between the flexible wiring board 10 and the flexible wiring board 10A is very narrow, and the surface tension is used to make the solder 7
5 does not flow out. The stator, motor and magnetic head of the third embodiment shown in FIG. 9 are the same as those of the first embodiment shown in FIG.

Fourth Embodiment FIG. 10 shows a rotary magnetic head device according to a fourth embodiment of the present invention. The rotary drum 102 of the rotor R includes the rotor core 6
The rotor core 6a has a coil holder 111 as a holding means. Coil holder 111
Holds the lead wire 12 of the coil of the rotor core 6a, and this lead wire 12 is directly connected to the flexible wiring board 10 by soldering. Example 4 of FIG.
Since the stator and the motor are similar to those of the first embodiment shown in FIG. 1, the description thereof will be omitted.

Embodiment 5 The rotary drum 202 of the rotor R shown in FIG.
a. The rotor core 6a has a flexible wiring board 10 and a crimp connector for electrically connecting with the flexible wiring board 10a interposed therebetween. The crimp connector is composed of a connector housing 230 and a connector terminal 211. That is, the flexible wiring board 10 and the flexible wiring board 10a are mechanically sandwiched by the connector terminals 211, and the wiring pattern of the flexible wiring board 10 and the wiring pattern of the flexible wiring board 10a are electrically connected. The flexible wiring board 10 is electrically connected to the magnetic head,
a is electrically connected to the coil lead wire of the rotor core 6a. Since the stator and the motor shown in FIG. 11 are the same as those in the first embodiment shown in FIG. 1, the description thereof will be omitted.

The flexible wiring board 10 in each of the embodiments shown in FIGS. 8 to 11 is a flexible wiring board already electrically connected to the head chip of the magnetic head.

As described above, in the embodiment of the present invention, the flexible wiring board 10 in which the electrical connection between the magnetic head and the lead wire of the rotary side rotary transformer (rotor core) is arranged between the rotary drum and the rotor core in a slight gap. Is done using. For example, in the first embodiment of FIG. 1, the lead wire 12 of the rotor core is treated by the coil holder 11 that holds it.
All you have to do is hook it on and hold it. This coil holder 11
Is the connection land portions 13b, 1 of the flexible wiring board 10.
4b is pressed against the rear surface 2a side of the rotary drum 2,
The land portions 13b and 14b of the flexible wiring board 10 and the lead wire 12 of the rotor core 6a can be positioned to easily electrically connect the two. In the case of electrically connecting the rotor core and the magnetic head, the embodiment of the present invention can be achieved with a small number of parts, and the man-hours can be significantly reduced to reduce the cost. The processing of the lead wire extending from the coil of the rotor core does not require soldering work to a terminal or the like as in the related art, but only needs to be hooked on the holder beyond the lead wire, and the manufacturing cost of the rotor can be reduced. The positioning of the lead wire extending from the coil of the rotor core and the connection land portion of the flexible wiring board can be easily performed by the coil holder as described above. Moreover, this coil holder, as described above,
By simply pressing and fixing the land portion of the flexible wiring board against the back surface of the rotary drum, the soldering work can be performed on the lead wire, and the workability is improved.

Due to the demand for miniaturization of the rotary magnetic head device, even if the space between the head base and the rotor core of the magnetic head is extremely small, by using the flexible wiring board, the land portion of the flexible wiring board can be removed. By offsetting out of the head base and pressing the land portion against the back surface of the rotary drum as described above, a wide space for soldering work can be secured. By increasing the plating thickness of the land portion of the flexible wiring board, when connecting the land portion of the flexible wiring board and the lead wire of the rotor core by soldering, there is no need to perform additional soldering such as bar soldering The work becomes very easy. Therefore, since the soldering workability is improved and additional soldering is not required, it is possible to suppress variations in the balance of the rotary shaft of the rotary drum.

The present invention is not limited to the above embodiment. The embodiment of the rotary magnetic head device described above has one rotating drum (upper drum) and one fixed drum (lower drum).
It is an example of a so-called two-layer type rotary magnetic head device having a. However, the present invention can also be applied to a so-called three-layer rotary magnetic head device in which the upper drum and the lower drum are fixed drums and the middle drum is a rotating drum.

[0026]

As described above, according to the present invention, it is possible to reduce the number of parts, to significantly reduce the man-hours and the cost.

[Brief description of drawings]

FIG. 1 is a sectional view showing a first preferred embodiment of a rotary magnetic head device of the present invention.

FIG. 2 is a plan view showing an example of a magnetic head attached to a rotary drum of the rotary magnetic head device of FIG.

FIG. 3 is a bottom view showing an arrangement state of a flexible wiring board on a rotating drum of a rotor R of the rotary magnetic head device of FIG.

FIG. 4 is a sectional view taken along the line AA of FIG.

5 is a plan view of a rotor core of the rotary transformer of FIG.

6 is a bottom view showing a rotor R to which the rotor core of the rotary magnetic head device of FIG. 1 is mounted.

7 is a sectional view taken along line BB in FIG.

FIG. 8 is a diagram showing a rotor that is Embodiment 2 of the rotary magnetic head device of the present invention.

FIG. 9 is a diagram showing a rotor of Example 3 of the rotary magnetic head device of the present invention.

FIG. 10 is a diagram showing a rotor of Example 4 of the rotary magnetic head device of the present invention.

FIG. 11 is a diagram showing a rotor of Example 5 of the rotary magnetic head device of the present invention.

FIG. 12 is a sectional view of a conventional rotary magnetic head device.

13 is a plan view showing a magnetic head of the conventional rotary magnetic head device of FIG.

[Explanation of symbols]

1 Fixed Drum 2 Rotating Drum 3 Magnetic Head 6 Rotary Transformer 6a Rotation Side Rotary Transformer Core (Rotor Core) 6b Fixed Side Rotary Transformer Core (Stator Core) 10 Flexible Wiring Board 11 Coil Holder (Holding Means) 12 Rotor Core Coil Lead Wires 13a, 14a Land part 13b, 14b Land part of flexible wiring board R Rotor S Stator

Claims (5)

[Claims] 1. A fixed drum, a rotary drum that rotates coaxially with the fixed drum, a magnetic head supported by the rotary drum, and a signal reproduced by the magnetic head is transmitted in a non-contact manner. Alternatively, in order to transmit a signal to the magnetic head in a non-contact manner, a fixed side rotary transformer core set on the fixed drum, a rotary transformer including a rotating side rotary transformer core set on the rotating drum, and a rotating side rotary transformer. A rotary magnetic head device comprising: a lead wire of a coil of a transformer core; and a flexible wiring board for electrically connecting the magnetic head. 2. The rotary magnetic head device according to claim 1, wherein the lead wire of the coil is held by a holding member. 3. The rotary magnetic head device according to claim 1, wherein the holding member is disposed on the surface of the rotary rotary core on the rotary drum side. 4. The rotary magnetic head device according to claim 3, wherein the holding means presses and fixes the land portion of the flexible wiring board and the lead wire of the coil to the surface of the rotary drum. 5. The rotary magnetic head device according to claim 1, wherein the solder portion of the land portion of the flexible wiring board for connecting the lead wire of the coil is thickened.