JPH06111202A - Rotary magnetic head apparatus - Google Patents

Abstract

PURPOSE:To provide a rotary magnetic head apparatus requiring no special connecting terminal, improved in electric characteristic and simplified in the manufacturing process. CONSTITUTION:This apparatus is provided with a magnetic head 2 and a rotary substrate 7 for forming an electronic circuit on a rotating rotor 4a. A connecting terminal 9 connecting the magnetic head 2 and the circuit substrate 7 is provided generally on the same plane as the circuit substrate 7.

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 used in a magnetic recording / reproducing apparatus or the like.

[0002]

2. Description of the Related Art In recent years, rotary magnetic head devices used for VTRs and the like have been required to be smaller and lighter, and to have higher performance such as multiple heads and wider bandwidth. The number of mounted rotary magnetic head devices is also increasing.

FIG. 8 is a structural sectional view of a conventional rotary magnetic head device, FIG. 9 is a top view of a rotary rotor of a rotary transformer in the conventional rotary magnetic head device, and FIG. 10 is an assembled perspective view of the conventional rotary magnetic head device. . In the figure, 41 is an upper rotary drum, and the magnetic head 42 is a screw 4
It is fixed to the upper rotary drum 41 by 3. The rotary rotor 44a of the rotary transformer 44 is fixed to a flange 46 into which a rotary shaft 45 is inserted and fixed by an adhesive or the like, and the flange 46 is fixed to the upper rotary drum 41 by screwing or the like. Rotating rotor 4 at this time
A relay board 47 such as a glass epoxy board is mounted on 4a. The winding 48 of the rotary rotor 44a is connected to the relay board 47 by soldering or the like. Further, the upper rotary drum 4 is provided on the relay substrate 47.
A plurality of first connection terminals 49 insulated by resin molding so as to penetrate through 1 are mounted by soldering or the like. The winding 48 and the first connection terminal 49 are electrically connected by the relay board 47. On the upper rotary drum 41, a circuit board 50 having an electronic circuit such as an amplifier circuit for a recording signal and a reproducing signal is formed, and is connected to the first connecting terminal 49 by soldering or the like. The magnetic head 42 and the circuit board 50
Are connected by soldering or the like with a plurality of second connection terminals 51 insulated by a resin mold or the like that penetrates the upper rotary drum 41. Further, the rotary magnetic head device is constructed by inserting the rotary shaft 45 on the rotary drum side into the insertion hole in which the rotary bearing 53 of the lower fixed drum 52 to which the fixed side stator 44b of the rotary transformer 44 is bonded is attached. Is.

However, in such a structure, dedicated connection terminals 49 and 51 are required to connect the rotary rotor 44a, the magnetic head 42, and the circuit board 50, and the number of connection points is increased, resulting in electrical characteristics. And the manufacturing process was complicated.

Further, forming the electronic circuit on the rotary rotor 44a makes the rotary rotor 44a large and the rotary rotor 44a hides the magnetic head 42. Therefore, the magnetic head 42 and the circuit board 50 can be connected. There wasn't. Since the circuit board 50 is located outside the rotary drum 41, it is disadvantageous in widening the recording signal band.

[0006]

In the rotary magnetic head device having the conventional structure, a dedicated connection terminal is required for connecting the rotary rotor, the magnetic head and the circuit board, and more connection points are required. Electrical characteristics are reduced,
The manufacturing process was complicated.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a rotary magnetic head device that does not require a dedicated connection terminal, has improved electrical characteristics, and has a simple manufacturing process.

[0008]

In order to achieve the above object, a rotary magnetic head device according to the present invention comprises a magnetic head mounted on a rotary drum, a rotary rotor which rotates integrally with the rotary drum, and a rotary rotor above the rotary rotor. And a circuit board for forming an electronic circuit arranged in. Further, connection terminals for connecting the magnetic head and the circuit board are provided on substantially the same plane as the circuit board.

Further, the outer diameter of the rotor is smaller than the outer diameter of the circuit board provided with the connection terminals.

[0010]

As described above, since the magnetic head is directly connected to the circuit board forming the electronic circuit, the electric characteristics are good, a dedicated connection terminal is not required, and the manufacturing process can be simplified.

[0011]

Embodiments of the present invention will be described below with reference to the drawings. 1 is a sectional view of a rotary magnetic head device according to an embodiment of the present invention, FIG. 2 is a plan view of a rotary drum according to an embodiment of the present invention seen from below, and FIG. 3 is an embodiment of the present invention. It is an assembly perspective view of the rotary magnetic head device which concerns on.

In the figure, reference numeral 1 denotes a rotary drum, and a magnetic head 2 is fixed to the rotary drum 1 by screws 3.
The rotary rotor 4a of the rotary transformer 4 is fixed to a flange 6 into which a rotary shaft 5 is inserted and fixed by an adhesive or the like, and the flange 6 is fixed by screws or the like to the upper rotary drum 1
It is fixed to. At this time, a circuit board 7 such as a flexible board or a thin glass-epoxy board on which an electronic circuit is formed is mounted on the rotary rotor 4a as shown in the diagram of the electronic circuit according to one embodiment of the present invention. There is.

In FIG. 4, reference numeral 12 denotes a magnetic head for scanning / recording / reproducing on a magnetic tape (not shown), and 13
Is an amplifier circuit for amplifying the recording signal, and 14 is an amplifier circuit for amplifying the reproduction signal. Reference numeral 15 is a changeover switch for changing over the recording / reproducing signal of each magnetic head, and 16 is a control circuit for the changeover switch 15. Thus, by using the electronic circuit as shown in FIG. 4,
The number of transmission channels of the rotary transformer 4, which was required in the same number as the conventional magnetic head, can be greatly reduced.
The rotary transformer 4 having a smaller diameter than the conventional one can be obtained.

The winding 8 of the rotary rotor 4a is
It is directly connected to the circuit board 7 by soldering or the like. Also, the rotary transformer 4 is a thick type, and the circuit board 7 and the rotary drum 1 of the magnetic head 2 are used.
And the surface that is not in close contact with each other are almost the same surface.
Then, as shown in FIG. 2, a connection terminal 9 such as a copper foil extending from the circuit board 7 is directly bonded to the connection pad 10 on the magnetic head 2 on which solder plating is applied by thermocompression bonding or the like. Subsequently, as shown in FIG. 1, the rotary shaft 5 on the rotary drum side is inserted into the insertion hole in which the rotary bearing 12 of the lower fixed drum 11 to which the fixed side stator 4b of the rotary transformer 4 is adhered is attached to rotate the rotary magnetic field. It constitutes a head device.

With the above structure, the rotary rotor 4a, the magnetic head 2 and the circuit board 7 can be directly connected to each other with a short transmission distance, so that a dedicated connection terminal is eliminated and the manufacturing process is simplified. The electrical characteristics can be improved.

Next, another embodiment of the present invention will be described.

FIG. 5 is a sectional view of a rotary magnetic head according to another embodiment, FIG. 6 is a plan view of a rotary drum according to another embodiment as seen from the back side, and FIG. 7 is a rotary magnetic head device according to another embodiment. It is an assembly perspective view.

In the figure, reference numeral 21 is a rotary drum, and the magnetic head 22 is fixed to the rotary drum 21 by screws 23. Rotating rotor 24 of rotary transformer 24
The a is fixed to a flange 26 into which the rotary shaft 25 is inserted and fixed by an adhesive or the like, and the flange 26 is fixed to the upper rotary drum 21 by screwing or the like. At this time, a circuit board 27 such as a flexible board or a thin glass-epoxy board having an electronic circuit as shown in the electronic circuit diagram of FIG. 4 is mounted on the rotary rotor 24a. By using such an electronic circuit, the number of transmission channels of the rotary transformer 24, which was required in the same number as in the conventional magnetic head, can be significantly reduced, and the rotary transformer 24 having a smaller diameter than the conventional one can be obtained.

At this time, the circuit board 27 has a larger outer diameter than the rotary transformer 24, and the magnetic head 2
The structure is such that a notch is provided in a portion facing 2. Further, the magnetic head 22 is attached to the edge of the rotary drum 21.
The convex portion 28 is provided so as not to interfere with the mounting of the circuit board 27, and the edge portion of the circuit board 27 is fixed by a small screw 29 or an adhesive agent. Winding 30 of the rotary rotor 24a
Are directly connected to the rotating substrate 27 by soldering or the like. The rotary transformer 24 is of a thick type as in the above-described embodiment so that the circuit board 27 and the surface of the magnetic head 22 which is not in close contact with the rotary drum 21 are substantially flush with each other. To Then, as shown in FIG. 6, a connection terminal 31 such as a copper foil extending from the circuit board 27 is directly bonded to the connection pad 32 on the magnetic head 22 on which solder plating is applied by thermocompression bonding or the like. Subsequently, as shown in FIG. 5, the rotary shaft 35 on the rotary drum side is inserted into the insertion hole in which the rotary bearing 34 of the lower fixed drum 31 to which the fixed side stator 24b of the rotary transformer 24 is adhered is attached to rotate the rotary magnetic field. It constitutes a head device.

With the above-mentioned structure, the rotary rotor 24a, the magnetic head 22,
Since the circuit board 27 can be directly connected with a short transmission distance, a dedicated connection terminal is eliminated, the manufacturing process is simplified, and the electrical characteristics can be improved.

[0021]

As described above, according to the present invention, a circuit board on which an electronic circuit such as a recording signal / playback signal amplifying circuit is formed is arranged on a rotating rotor of a miniaturized rotary transformer.
Further, by making the circuit board and the electrical connection terminals of the magnetic head substantially flush with each other, the connection between the rotary rotor, the magnetic head and the circuit board is short and the connection distance is direct. As a result, a dedicated connection terminal is not required, the manufacturing process is simplified, and a rotary magnetic head device excellent in electrical characteristics can be obtained.

[Brief description of drawings]

FIG. 1 is a sectional view of a rotary magnetic head device according to an embodiment of the present invention.

FIG. 2 is a plan view of a rotary drum according to an embodiment of the present invention seen from below.

FIG. 3 is an assembled perspective view of a rotary magnetic head device according to an embodiment of the present invention.

FIG. 4 is a diagram of an electronic circuit according to an embodiment of the present invention.

FIG. 5 is a sectional view of a rotary magnetic head device according to another embodiment of the present invention.

FIG. 6 is a plan view of a rotary drum according to another embodiment of the present invention as viewed from the back side.

FIG. 7 is an assembled perspective view of a rotary magnetic head device according to another embodiment of the present invention.

FIG. 8 is a structural cross-sectional view of a conventional rotary magnetic head device.

FIG. 9 is a top view of a rotary rotor of a rotary transformer in a conventional rotary magnetic head device.

FIG. 10 is an assembled perspective view of a conventional rotary magnetic head device.

[Explanation of symbols]

1, 21 ... Rotary drum, 2, 22 ... Magnetic head, 4a,
24a ... Rotating rotor, 4b, 24b ... Fixed stator, 7, 27 ... Circuit board, 9, 31 ... Connection terminal, 11,
33 ... Fixed drum.

Claims (3)

[Claims] 1. A rotary comprising: a magnetic head mounted on a rotary drum; a rotary rotor which rotates integrally with the rotary drum; and a circuit board which is disposed on the rotary rotor and forms an electronic circuit. Magnetic head device. 2. The rotary magnetic head device according to claim 1, wherein connection terminals for connecting the magnetic head and the circuit board are provided on substantially the same plane as the circuit board. 3. The rotary magnetic head device according to claim 2, wherein an outer diameter of the rotor is smaller than an outer diameter of a circuit board provided with the connection terminal.