JPH0220805Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a rotary transformer device for transmitting signals between a magnetic head and a signal processing circuit.

Configuration of Conventional Example and its Problems The conventional device will be explained using FIGS. 1 to 5. Fig. 1 is a sectional view of the upper and lower drums and the rotating transformer device, Fig. 2 is a connection diagram between the magnetic head and the rotating transformer device, Fig. 3 is a plan view of the fixed side rotating transformer, and Fig. 4 is a bottom view of the same. FIG. 5 is a cross-sectional view of the fixed rotating transformer fixed to the lower drum.
1 is the upper drum, which is fixed to disk 2,
The disk 2 is rotatably fixed to the lower drum 3, and at the same time the upper drum 1 is also rotatable, a tape (not shown) is wound diagonally around the upper drum 1 and the lower drum 3, and the magnetic head 4 is rotated. This constitutes a so-called helical scan method in which an inclined recording track is formed on the tape and reproduced. The magnetic head 4 is fixed to the upper drum 1, and connected via a lead wire and a printed board 5 to a rotary side rotary transformer 6 which is glued to the disk 2, and is connected to the lower drum 3 by magnetic induction by gluing or the like. The signal is transmitted to the stationary rotary transformer 7 that is fixed. A groove 8 is provided on the bottom of the fixed side rotating transformer 7, and a tube is placed over both ends of the coil winding 9, and a lead wire 10 is inserted.
The lead wire 10 is fixed in the groove 8, and the other end of the lead wire 10 is soldered to a printed board 11, through which a signal is sent to a head amplifier (not shown). In this way, it is configured to transmit and receive signals between the rotary transformer device and the signal processing circuit. As shown in FIGS. 3 and 4, as the number of magnetic heads 4 increases, the number of coil grooves into which the coil winding 9 of the stationary rotary transformer 7 is inserted increases, and both ends of the coil winding 9 The number of twisted lead wires 10 is 4 in the magnetic head.
It increases in proportion to twice the number of. Using the lead wire 10 in this manner has poor soldering workability, causes wiring errors, and is difficult to handle in automation. Also, as is clear from Figure 5,
As the number of coil grooves increases, the fixed side rotating transformer 7
The outer diameter of the drum 3 increases, and the area of adhesion with the lower drum 3 increases. As a result, the amount of adhesive used increases, and the possibility of foreign matter getting involved increases.
Ensuring the mounting accuracy (surface wobbling, etc.) of the fixed side rotary transformer 7 was a problem.

Purpose of the invention The purpose of the present invention is to eliminate the above-mentioned conventional drawbacks, and to provide a rotating transformer device that has good workability in installation and wiring work, is easy to automate, and can easily ensure installation accuracy. do.

Structure of the Invention In order to achieve the above object, the rotary transformer device of the present invention includes a rotating plate-shaped annular core that rotates together with a magnetic head and has a coil winding connected to the magnetic head on one side. , an annular plate-shaped stationary core that faces the rotating core, has a coil winding mounted on its opposing surface, and has a half-moon-shaped stepped portion having a straight side on the opposite surface; The side core has a straight edge that can come into contact with the straight side of the step, and the straight edge is mounted opposite to the straight side of the step and is connected to the coil winding. A plurality of slits are provided along the radial direction of the surface on which the coil winding of the stationary side core is attached and at positions corresponding to the stepped portions, and the flexible printed board is provided with: A plurality of electrodes at one end of this flexible printed board are arranged at the same position as both ends of a plurality of coil windings of the fixed side core pulled out through the slit, and a plurality of electrodes at the other end are arranged at the same position as both ends of the plurality of coil windings of the fixed side core pulled out through the slit. It is formed so as to face the electrode part at the same pitch.

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. Figure 6 is a cross-sectional view of the stationary side rotating transformer attached to the lower cylinder, Figure 7 is a plan view of the stationary side rotating transformer, Figure 8 is a bottom view of the fixed side rotating transformer, and Figure 9 is a bottom view of the fixed side rotating transformer.
The figure is an exploded perspective view of the upper and lower cylinders and the rotary transformer device, and the same components as those shown in FIGS. 1 to 5 are given the same reference numerals and their explanations will be omitted. 6 to 9, 12 is a fixed rotating transformer, 13 is a flexible printed board, and the annular plate-shaped ferrite core 14 of the fixed rotating transformer 12 has a recess 14a on the bottom surface.
A plurality of slits 14b are formed along the radial direction at positions corresponding to the recesses 14a on the upper surface where the coil winding 9 is arranged. The flexible printed board 1 is placed in the recess 14a.
3 is installed, and the fixed side rotating transformer 1
Both ends of the second coil winding 9 are led out to the flexible printed board 13 side through the slit 14b, and are soldered to one end of an electrode of the flexible printed board 13.

Here, the recess 14a has a half-moon shape, and one end of the flexible printed board 13 has a linear edge that can come into contact with the linear side forming the recess 14a. is attached to face the linear side of the recess 14a.

The other end of the electrode of the flexible printed board 13 is formed to face the electrode of the printed board 11 at the same pitch, and is soldered to the electrode of the printed board 11 by means such as heat fusion, and the printed board 11 is connected to the shield wire. (not shown) to the head amplifier. In this way, signals are exchanged between the rotary transformer device and the head amplifier via the flexible printed board 13 and the printed board 11.

Effects of the invention As explained above, according to the invention, since a flexible printed board is used instead of the conventional lead wires, incorrect wiring is prevented and there is no fear of damage to the lead wires due to tension, etc. Since there is no lead wire, handling is very easy, and it is also possible to solder both ends of the coil winding of the fixed side core and the electrode part of one end of the flexible printed board from a fixed direction. Furthermore, it is now possible to connect the circuit board with heat fusion, etc., which improves the workability of the connection work and enables unmanned operation through automation, improving overall assembly efficiency. It is possible to realize cost reduction through improvements.

Furthermore, when attaching the flexible printed board to the fixed core, even if the position of the flexible printed board is shifted in the circumferential direction of the fixed core with respect to the fixed core, the flexible printed board The linear edge at one end comes into contact with the linear side forming the stepped portion of the fixed core, and the amount of positional deviation of the flexible printed board is regulated. The amount of relative positional deviation between the printed board and the electrodes is extremely small, making it easy to connect the flexible printed board to the fixed core, and to connect the electrodes of the coil winding of the fixed core to the electrodes of the flexible printed board. Work efficiency can be improved and automation can be achieved. In addition, by creating a recess in the ferrite core of the fixed-side rotating transformer to reduce the mounting area between the fixed-side rotating transformer and the lower drum, assembly accuracy such as surface wobbling is reduced due to a reduction in the amount of adhesive applied and a reduction in the interference of foreign objects. It is possible to improve the

[Brief explanation of the drawing]

Figures 1 to 5 show conventional examples, Figure 1 is a sectional view of the upper and lower drums and the rotating transformer device, Figure 2 is a connection diagram between the magnetic head and the rotating transformer device, and Figure 3 is the fixed side rotating FIG. 4 is a plan view of the transformer, FIG. 4 is a bottom view thereof, FIG. 5 is a sectional view of the stationary rotary transformer fixed to the lower drum, FIGS. The figure is a sectional view of the stationary side rotating transformer attached to the lower cylinder, Figure 7 is a plan view of the stationary side rotating transformer, and Figure 8 is a bottom view of the same.
FIG. 9 is an exploded perspective view of the upper and lower cylinders and the rotating transformer device. 4... Magnetic head, 6... Rotating side rotating transformer, 9... Coil winding, 12... Fixed side rotating transformer, 13... Flexible printed board, 14...
...Ferrite core, 14a... recess.

Claims (1)

[Scope of utility model registration request] An annular plate-shaped rotating core that rotates together with the magnetic head and has a coil winding connected to the magnetic head attached to one surface, and a coil winding that faces the rotating core and has a coil winding attached to the opposing surface. and an annular plate-shaped stationary core in which a half-moon-shaped stepped portion having a straight side portion is formed on the opposite surface, and a linear side core that can come into contact with the linear side portion of the stepped portion of the stationary side core. a flexible printed board having an edge, the linear edge facing the linear side of the stepped portion, and connected to the coil winding; A plurality of slits are provided along the radial direction on the mounting surface and at positions corresponding to the stepped portions, and the flexible printed board is fixed such that a plurality of electrodes at one end of the flexible printed board are drawn out through the slits. A rotary transformer device arranged at the same position as both ends of a plurality of coil windings of a side core, and formed so that a plurality of electrode portions at the other end face a plurality of electrode portions of a circuit side board at the same pitch.