JPS61219116A - Rotary head - Google Patents

Abstract

PURPOSE:To extremely simplify the connection between a rotary head and a rotary transformer by providing an aperture in a rotary drum by corresponding to the position of the connection between a flexible printed circuit board and the terminal of the rotary transformer. CONSTITUTION:Flexible printed circuit boards 16a, 16b are extended from magnetic heads 14a, 14b attached to a rotary drum 11 and connected to the terminal patterns 130a, 130b, 131a, 131b of a rotary transformer 13. Corresponding to the positions of these connections, apertures 19a, 19b are formed in the rotary drum 11. This enables a soldering iron, etc. to abut on the connections through the apertures 19a, 19b from outside the rotary drum 11 in the state of assembly and a connection or a separation can be handled simply by using the bending of the flexible printed circuit boards 16a, 16b. Consequently, the construction requires no normal lead wires nor terminal boards.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a rotating head device.

[Summary of the invention]

The present invention extends a flexible printed wiring board from a rotating head and connects it to a terminal of a rotary transformer,
An opening is provided in the rotating drum so that connection (for example, soldering) or disconnection between the flexible printed wiring board and the terminal of the rotary transformer can be performed from the outside through the opening.

[Conventional technology]

Generally, a rotating head unit consists of a rotating drum and a stationary drum, and one or more magnetic heads are arranged around the periphery of the rotating drum. The head height is determined so that the tip of the head somewhat protrudes from the circumferential surface near the gap between the open surfaces of the rotating drum and the fixed drum, so the head is usually fixed to the bottom surface of the internal space of the cap-shaped rotating drum. Ru. On the other hand, signals are exchanged between the rotating part and the fixed part via a rotary transformer. The rotating part of this rotary transformer is arranged so as to cover or close the internal space of the rotating drum. Therefore, especially in a small-diameter rotary hemlock T unit, it is difficult to connect the head lead and the transformer lead with the magnetic head and rotary transformer assembled. That is, it is not possible to secure a space for inserting a soldering iron or the like.

Conventionally, a terminal board with insert-molded pin terminals was attached to each side of the rotary transformer and the head, and the pin terminals extending parallel to the rotating shaft were passed through small holes formed in the head mounting surface of the rotating drum to rotate the drum. The wires were led out to the upper surface of the outside of the drum, and mutual connections were made using a printed wiring board or the like placed on the upper surface.

[Problem that the invention seeks to solve]

Therefore, in the conventional rotary head unit, the wiring structure between the head base and the leads of the rotary transformer is very complicated, which hinders the reduction in diameter and thickness, and also causes a lack of reliability and high cost. Furthermore, since a large number of small holes through which the pin terminals of the connection terminal board pass must be made on the upper surface of the rotating drum, it has been difficult to provide multiple channels in the case of a small-diameter rotating head.

SUMMARY OF THE INVENTION An object of the present invention is to solve these problems and provide a rotary head device which has a simple wire connection structure suitable for reduction in diameter and thickness, and which can be manufactured with high reliability and at low cost.

Measures for Solving Problem c] As shown in the perspective view of the main parts of the rotary head device in FIG. Terminal patterns 130a and 130b of transformer 13
, 131a, 131b, and openings 19a, 19b are formed in the rotating drum 11 corresponding to these connection positions.

[For production]

Opening 19a from the outside of the rotating drum 1 in the assembled state.

A soldering iron or the like can be applied to the connecting portion through 19b, and connection or disconnection can be easily performed using the bending of the flexible printed wiring boards 16a and 16b. Therefore, it has a structure that completely eliminates the usual lead wires and terminal boards.

〔Example〕

FIG. 1 is a perspective view of the main parts of the rotary head device of the present invention, and FIG.
The figure is a longitudinal cross-sectional view of the entire structure. The rotating shaft 1 is a fixed drum 20
In the center through hole 21 of (lower drum), the bearing 22,
It is rotatably supported by 23. A rotating drum unit IO is fixed to the upper end of the rotating shaft I, and a motor unit 3° is arranged at the lower end.

The rotating drum unit 10 includes a rotating drum 11 (upper drum) and a flange member 12.
is press-fitted and fixed to the rotating shaft 1, and then the rotating drum 11 is fixed to the upper part of the fixed flange member 12 with screws or the like. Further, the flange lower surface 12 of the flange member 12
The rotating part 13a of the rotary transformer 13 is attached to a, and when the flange member 12 is press-fitted, the rotating part 13a is connected to the fixed part 13b of the rotary transformer 13 fixed to the upper surface of the fixed drum 20 with a small gap between the parts. faced.

3 and 4 are top and bottom views of the rotating drum 11. In this embodiment, a pair of magnetic heads 14a and 14b (head chips) spaced apart by 180° are mounted on a head base 1.
It is attached to the lower surface of the rotating drum 11 via 5a and 15b. Flexible printed wiring boards 16a, 1 on which lead patterns are printed are mounted on the head bases 15a, 15b.
6b is attached, and each winding lead of the head 14a<14b) is attached to a pair of lead patterns 17a, 17b (18
a, 18b). These lead patterns 17a, 17b (18a, 18b)
The head 14a is divided into two parts along the circumferential direction of the head 14a.
4b to a position approximately 90° away.

As shown in the top view of FIG. 3, a pair of oval openings 19a and 19b are formed at the periphery of the upper surface of the rotating drum 11 approximately 90'' away from the heads 14a and 14b.

Leads of flexible printed wiring boards 16a and 16b @16
aT, I 6 bT are these openings 19a, 19
terminal patterns 130a, 130b, 131a, 131b of the rotating part 13a of the rotary transformer 13, extending to the position of the lead ends 16aT, 16bT.
is located.

5 and 6 show the rotating part 1 of the rotary transformer 13.
The back side and the gap facing side of 3a are shown, respectively.

As shown in FIG. 5, a ring-shaped printed wiring board 133 is attached to the back surface 13aB of the rotating part 13a, and the above-mentioned terminal patterns 130a, 130b are formed on the upper surface of the ring-shaped printed wiring board 133.

131a and 131b are formed. In the case of 2 channels, as shown in FIG. 6, the gap facing surface 13aG has:
Two concentric coils 134a.

134b is wound, and each pair of lead wires 134aL
, 134bL are holes 135a drilled in the core.

135b and a hole 136a drilled in the printed wiring board 133
, 136b to the surface of the printed wiring board 133, and terminal patterns 130a, 130b.

131a and 13lb.

Therefore, according to the above-mentioned wiring structure, the opening 19a.

When a soldering iron is applied through 19b, lead patterns 17a, 17b, 18a□, 18b and terminal pattern 1 are connected using the flexibility of flexible printed wiring boards 16a, 16b.
30a, 130b, 131a.

131b can be easily connected. Note that the land pattern L and the terminal pattern 130a at the ends of the lead patterns 17a, 17b, 18a, and 18b.

130b, 131a, and 131b are preferably solder-plated in advance.

The motor unit 30 is of a well-known face-to-face type and includes a ring-shaped magnet 32 and a coil 34 facing the ring-shaped magnet 32. The magnet 32 is fixed to the rotor yoke 31, and the rotor yoke is fixed to the shaft 1 via a boss 37.
Further, a yoke plate 38 is attached to the boss 37 so as to sandwich the coil 34 therebetween. The coil 34 is attached to the fixed drum 20 in the gap between the magnet 32 and the yoke plate 38.
5 (three pieces) are disposed on the coil substrate 36 held through the coil board 36.

A ring-shaped FG magnet 39 is fixed to the upper part of the rotor yoke 31 and magnetized subdivided along the circumferential direction, and facing the FG detection board 4 on which an FG detection coil is printed and wired.
0 is fixed to a fixed drum 20.

Note that the entire rotary head unit is held on the chassis via a mounting plate 50 attached to the lower surface of the fixed drum 20.

As described above, according to the present invention, the connection between the head and the rotary transformer is extremely simple, reliability is improved, and manufacturing costs are reduced.

This is particularly effective when applied to a small-diameter rotary head, and contributes to making the rotary head unit thinner. In addition, since the rotary transformer and the head are connected during final assembly, while measuring the terminal impedance (inductance) on the fixed side of the rotary transformer with the head disconnected, the connection between the rotating part 13a and the fixed part 13b of the rotary transformer is measured. Gap adjustment can be performed based on inductance measurements. Furthermore, since it is easy to disconnect the wires, repairs are easy and the head can be easily replaced.

Although the above-mentioned embodiment is a case of two heads, the present invention may be applied to one head or even to a multi-channel head having four or more heads. Also, like a double azimuth head, there are two pairs (4 pairs) of lead wires coming out from one head.
Even in some cases, this can be addressed by increasing the number of branches at the lead ends of the flexible printed wiring board.

It can also be applied when the rotating drum is a medium drum.

Note that an opening 19a is formed in the rotating drum 11.

19b is convenient for balancing the force 5 rotations, which are arranged symmetrically with respect to the rotation axis 1. Opening 19a.

If dust entering through 19b becomes a problem, openings 19a and 19b may be closed with a sealing member. The seal member may be used as a plate for displaying the manufacturer, manufacturing type, serial number, etc.

〔Effect of the invention〕

According to the present invention, as described above, the connection between the rotary head and the rotary transformer is extremely simple, and a rotary head unit having a small diameter, thin shape, and high reliability can be manufactured at low cost.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing the main parts of a rotary head device according to the present invention, FIG. 2 is a longitudinal sectional view of the whole, FIG. 3 is a top view of the rotary drum, FIG. 4 is a bottom view of the rotary drum, and FIG. The figure is a rear view of the rotary transformer, and FIG. 6 is a side view of the rotary transformer facing the gap. In addition, in the symbols used in the drawings, 10--・-----1----- Rotary transformer 14a, 14b ・----- Magnetic head 16
a, 16b・-1----Flexible printed wiring board 1
9aJ9b -・----1 opening 20-------1-------m-Fixed drum 30----------1.- Motor units 130a, 130b One terminal pattern 131a, 131b One terminal pattern 133--------------m-Printed wiring board.

Claims (1)

[Claims] Electrical connection between the rotating head and the rotary transformer is made via a flexible printed wiring board, and openings are provided in the rotating drum corresponding to the connection positions between the flexible printed wiring board and the terminals of the rotary transformer. A rotating head device characterized by: