JP2884616B2 - Wiring device for rotating head - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic wiring device of a tape recorder capable of reciprocating recording and reproduction in which a track position of a magnetic tape is switched by rotating a magnetic head.

2. Description of the Related Art Recently, a tape recorder capable of reciprocating recording and reproduction, in which a magnetic head is rotated to switch a track position of a magnetic tape, has been proposed. , And the point of improving mechanical accuracy has become mainstream.

Conventionally, in a device of this type, a lead wire for transmitting a signal of a magnetic head is inserted through a hollow portion of a rotating shaft and pulled out to the outside of the back surface, or the lead wire is wound around a rotating member which rotates with the rotating shaft or the head. There is known a method of performing a lead wire process of drawing out to the outside of the side surface.

However, there have been many problems such as disconnection of the lead wire, rotational load due to torsional resistance, and low reliability of the soldered portion. For this reason, in recent years, a rotary head in which a lead wire is replaced by a flexible printed circuit board (hereinafter, referred to as FPC) has been devised.

Hereinafter, a magnetic head device of the above-described tape recorder will be described with reference to the drawings.

3 and 4 show a conventional example using an FPC, FIG. 3 is an exploded perspective view, and FIG. 4 is a partial sectional view seen from the back. Head mount 21 with rotating head 20 stored and fixed
Is a rotating body 22 having a head rotation switching gear 18a formed at the other end.
, And is supported by a rotation support shaft 12 provided on a base plate 25 fixed to a head base 27. The head rotation switching gear 18a is configured to mesh with a driving gear 28 supported on a shaft 27a on the head base 27.

Furthermore, FP whose one end is soldered to the terminal of the head 20
C19 is bent by 90 ° at the outlet of the head mount 21 to wind the FPC winding portion 19a around the rotating body 22 and fix the FPC end portion 19b to the head base 27.

Problems to be Solved by the Invention However, in the above conventional configuration, the FPC winding portion 1
As the number of rotations of the head increases at a place where the head contacts the FPC end face 19c inside the 9a, wear occurs, or the outlet of the FPC 19 from the head 20 is pulled only from the direction of the FPC wrapping portion 19a. There is a problem in the service life of the FPC and the head soldered part because torsional stress is generated in the FPC.

The present invention is a part of FPC, just add a protruding shape,
An object of the present invention is to provide a long life and high reliability wiring device for a rotary head without increasing the number of parts.

Means for Solving the Problems A magnetic head device of a tape recorder according to the present invention comprises: a magnetic head rotatable according to a tape running direction in each of a normal direction and a reverse direction; A member and an FPC connected to the magnetic head and wound around the rotating member with elasticity in the rotating direction, and near the magnetic head soldering portion of the flexible substrate on the side opposite to the winding direction. The protruding portion is provided, and the wound flexible printed circuit board comes into contact with the surface of the protruding portion and presses the protruding portion.

Function As described above, the present invention adds a projecting shape on the side opposite to the winding direction near the magnetic head soldering portion of the FPC for rotating head wiring, thereby increasing the number of parts and cost without increasing the number of parts. Long life as a signal line for operation,
This realizes a highly reliable rotary head wiring device.

Embodiments Hereinafter, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is an exploded perspective view, and FIG. 2 is a partial sectional view as viewed from the back.

1 to 3, a head mount 21 accommodating and fixing a rotating head 20 is fixed to a rotating body 23 having a head rotation switching gear 22 formed at the other end with a mounting screw 24, and provided on a base plate 25. The base plate is fixed to a head base 27, and the head base is attached to a head substrate (not shown) that advances during reproduction. The head rotation switching gear 22 is a driving gear.
The drive gear 28 is rotatably supported by a support shaft 27a on the head base.

Furthermore, FPC 29 connected to head 20 is head mount 2
It is bent 90 degrees at the outlet of 1 and passed through the opening 23a of the rotating body 23, and the winding part 29a of the FPC is wound around the drum part 23b of the rotating body 23 with a margin necessary for 180-degree rotation. I have. At the exit from the head mount 21, the FPC 29 is provided with a protruding portion 29c on the side opposite to the winding portion 29a, and the inside of the winding portion 29a presses the surface of the protruding portion 29c in the wound state. I have. Further, the FPC end portion 29b is fixed to the head base 27.

The fixing of the FPC end may be performed not on the head block but on a mechanical chassis or the like.

The operation of this embodiment configured as described above will be described below.

In FIG. 2, the initial state is due to the elasticity of FPC29 (a).
2 is rotated by the head switching drive means (not shown) to the position (b), and in conjunction therewith, the rotating body 23 is rotated 180 degrees while the PFC 29 is being wound. At this time, the track of the head rotates at a point symmetrical position with respect to the rotation center, and changes from the normal rotation state to the inversion state track position.

As described above, by providing the projections 29c on the FPC as in the present embodiment, the wrapped portion of the FPC does not contact the end surface of the FPC as shown in FIG. Even if the number of rotations increases, the inside of the winding portion 29a does not wear. Also, FPC
At the outlet from the head mount 21 of 29, stress is received along with the rotation of the head 20 in the direction of the FPC winding portion 29a, but at the same time, the projecting shape portion 29c also receives stress from the inside of the winding portion 29a. Since no torsional stress is applied at the outlet, FPC2
9 and the life of the soldered portion to the head terminal can be extended.

Effect of the Invention As described above, the present invention provides a magnetic head rotatable according to the tape running direction in each of a normal direction and a reverse direction, a rotating member that rotates with the magnetic head, and a magnetic head connected to the magnetic head. An FPC wound around the rotating member with elasticity in the rotating direction, and a protruding shape on the side opposite to the winding direction near the magnetic head soldering portion of the flexible substrate. Since the wound flexible printed circuit board comes into contact with the surface of the shape portion, and is configured to press the projecting shape portion, the winding portion of the flexible substrate comes into contact with the surface of the projecting shape portion, Even if the number of rotations increases, the inside of the flexible printed circuit does not wear out, and at the exit from the head mount of the flexible printed circuit, the projecting shape receives stress from the inside of the flexible printed circuit. Therefore, the service life of the soldered portion of the flexible substrate and the head terminal can be extended without applying torsional stress at the outlet portion. This makes it possible to realize a rotating head wiring device having a very long life for a rotating operation without increasing the number of parts and costs.

[Brief description of the drawings]

1 and 2 show an embodiment of a wiring device for a rotary head according to the present invention. FIG. 1 is an exploded perspective view of the device, and FIG. 2 is a partial sectional view of the device as viewed from the back. FIG. 3 and FIG.
FIG. 3 is a conventional example, FIG. 3 is an exploded perspective view, and FIG. 4 is a partial cross-sectional view as viewed from the back. 20 ... Rotating head, 23 ... Rotating body, 29 ... FPC.

Continuing on the front page (72) Inventor Masayuki Nagano 1006 Kazuma Kadoma, Osaka Prefecture Inside Matsushita Electric Industrial Co., Ltd. References JP-A-63-269316 (JP, A) JP-A-64-67744 (JP, A)

Claims (1)

(57) [Claims] A magnetic head rotatable in each of a normal direction and a reverse direction in which the tape runs, a rotating member rotating with the magnetic head, and a rotating member connected to the magnetic head. A flexible printed circuit board wound with elastic force in the rotation direction, and a protruding shape on the side opposite to the winding direction near the magnetic head soldering portion of the flexible board. A wiring device for a rotary head, wherein the wound flexible printed circuit board is brought into contact with the surface of the portion to press the protruding portion.