JP2507581Y2 - Rotating transformer rotor structure - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary transformer which is one of the components of a rotary head device such as a VTR,
In particular, it relates to improvement of the structure on the rotor side centering on the rotor core.

[0002]

2. Description of the Related Art As is well known, in a general rotary head device of a VTR, an upper cylinder and a lower cylinder having the same outer diameter are coaxially arranged, and a magnetic head is attached to an upper cylinder side of a boundary portion between both cylinders. There is. The lower cylinder is fixed, and the upper cylinder is rotationally driven together with the magnetic head.

A rotary transformer is incorporated in the rotary head cylinder mechanism. A disk-shaped rotor core is attached to the upper cylinder, and a disk-shaped stator core is also attached to the lower cylinder. The two cores are opposed to each other in a coaxial state with a minute gap therebetween, and coil windings are laid on the respective opposed surfaces. The coil winding wire laid on the rotor core is connected to the magnetic head, and the lead wire of the coil winding on the stator core side is led out to be connected to the recording / reproducing circuit.

Here, the conventional rotor structure of the rotary transformer will be described in detail. The above-mentioned coil windings are laid in concentric grooves on the front side of the disk-type rotor core, and a donut-type relay board made of a printed wiring board is bonded to the back side on the opposite side of the rotor core. The lead wire end of the coil winding extended from the front side is soldered to a predetermined portion of the relay board on the rear side.

Also, a terminal base made by implanting a plurality of lead pins on a plastic base is prepared as a separate component, and this terminal base is positioned on the back side of the rotor core to which the relay board is adhered. Then, the tongue piece at the base of the lead pin comes into contact with the bonding land provided on the relay board. Therefore, the terminal block and the rotor core are properly positioned and bonded, and the tongue piece of the lead pin is soldered to the bonding land portion of the relay board.

The rotor assembly thus constructed is attached to the upper cylinder, and another lead wire is connected between the magnetic head also attached to the upper cylinder and the lead pin of the terminal block for soldering. ing.

[0007]

As described above, in the conventional rotary transformer rotor structure, the relay substrate and the terminal block are added to the rotor core for terminal treatment of the coil windings. The number of points was large and the structure was complicated, and the number of man-hours for these assembling operations was also large. Therefore, it is difficult to reduce the cost of the product, and there is an obstacle in terms of size reduction and weight reduction.

An object of the present invention is to make it possible to combine the processes from the external drawing of the coil winding of the rotor core to the magnetic head connection on the rotor side of the rotary transformer in the rotary head device with an extremely simple structure. .

[0009]

In order to achieve the above object, the present invention relates to a disc type rotor core in which coil windings are laid in concentric grooves formed on the front side, and the rotor core. A relay board which is adhered to the back side of the magnetic head in accordance with the mounting position of the magnetic head and has a tip portion protruding outward from the outer peripheral edge of the rotor core, the relay board including a pair of conductive lands provided at both ends. , Having a conductive pattern connecting between the conductive lands, the lead wire end of the coil winding is soldered to the one conductive land,
A terminal portion on the magnetic head side is directly connected to the other conductive land.

The other conductive land may have the other end of a conductive wire whose one end is fixed by soldering to the conductive land on the magnetic head side.

[0011]

The relay board is locally attached to the back side of the rotor core at a position corresponding to the mounting position of the magnetic heads in the same number as the magnetic heads. Moreover, the front end side of the relay board projects outward from the outer peripheral edge of the disk-shaped rotor core, and the conductive land provided on the projecting portion is directly connected to the magnetic head side terminal portion to rotate the magnetic head. The transformer rotor is electrically connected. Further, if the conductive wire is fixed to the conductive land of the relay board, the electrical connection between the magnetic head and the rotor becomes more reliable.

[0012]

1 and 2 show a rotary transformer rotor structure according to a first embodiment of the present invention. The rotor core 20 is
It is a ferrite component formed in a disk shape with a circular hole in the center. As shown in FIG. 1, a plurality of concentric coil grooves 21 are formed on the front side of the rotor core 20, and four lead wire drawing grooves 23 are formed in the radial direction.

This embodiment is a two-channel rotary transformer for a rotary head device having two magnetic heads, in which two coil grooves of a rotor core 20 are provided with coil windings 22 respectively. Lead wires 24 at both ends of the winding wire 22 are respectively wired to the outer peripheral edge of the rotor core 20 through the radial drawing grooves 23.

As shown in FIG. 2, two relay substrates 25 are attached to the back side of the rotor core 20 by adhesion. The relay board 25 is a component that is sufficiently smaller than the rotor core 20, and is formed in a generally U-shape as a whole, and is provided with a pair of L-shaped tip portions 25a facing the opening of the U-shape, and the central portion thereof. Is adhered near the outer periphery of the back surface of the rotor core 20, and the substantially L-shaped tip portion 25 a projects outward from the outer peripheral edge of the rotor core 20. The two relay boards 25 are positioned and mounted so as to face each other in the diametrical direction of the rotor core 20 in accordance with the position of the magnetic head 40 mounted on the upper cylinder (not shown) of the rotary head device. There is. Further, as shown in FIG. 1, the lead wire lead-out groove 23 on the front side of the rotor core 20 is arranged so as to extend toward both end portions 25a of the relay board 25 attached to the back side.

The relay board 25 is provided with a conductive pattern 27 having a predetermined shape and conductive lands 28 and 28a formed at the ends of the conductive pattern 27, and one conductive land 28 is inside the rotor core 20. While being located,
The other conductive land 28 a is provided on the tip portion 25 of the relay board 25.
It extends to a. One conductive land 2 of the relay board 25
As described above, the ends of the lead wires 24 of the coil winding 22 that are wired in the lead-out groove 23 and drawn to the outer peripheral edge portion of the rotor core 20 are soldered and fixed at 8.

On the other hand, a conductive land having a predetermined pattern is also printed and formed on the substrate 41 of the magnetic head 40, and the tip of the conductive land serves as the terminal portion 30. The magnetic head 40 is a substrate 41
It is attached to the above-mentioned upper cylinder (not shown) with a fixing screw 42 penetrating through. Further, when the rotor assembly centering on the rotor core 20 is positioned and attached to the cylinder, the conductive land 28a of the relay board 25 is in a positional relationship just facing the terminal portion 30 of the magnetic head board 41. Therefore, the relay board 25 and the board 41 are faced to each other and coupled by a mechanical means, or the conductive land 28a and the conductive land of the board 41 are tightened by interposing a conductive adhesive therebetween. Electrical connection is secured.

In the example shown in FIG. 2, the front surface side of the substrate 41 is shown for easy understanding, but the substrate 41 is actually placed on the relay substrate 25 in an inverted state. It Further, as the relay board 25, various printed wiring boards such as a glass epoxy board, a paper phenol board, and a flexible board can be used.

3 and 4 show another embodiment of the present invention. In the following description, the same or corresponding parts as those in the above embodiment are designated by the same reference numerals, and detailed description thereof will be omitted. In the relay board 25 of this embodiment, a part of the L-shaped tip portion of the above embodiment is removed and the whole is formed in a concave shape. Then, through holes (not shown) are provided in the conductive lands 28a provided in the concave facing portion 25b. One end of a relatively wide conductive wire 26 is inserted into each through hole and fixed by soldering. As shown in the figure, the conductive wires 26 are attached two by two and face each other facing inward.

On the other hand, the substrate 41 of the magnetic head 40 is the same as that in the above-mentioned embodiment, but its mounting is opposite to that in the above-mentioned embodiment. The magnetic head 40 is attached to the above-mentioned upper cylinder (not shown) by a fixing screw 42 penetrating the substrate 41. Further, when the rotor assembly centering on the rotor core 20 is positioned and attached to the cylinder, the tip end of the conductive wire 26 of the relay substrate 25 is in a positional relationship where it is just opposite to the terminal portion 30 of the magnetic head substrate 41. The tip of the conductive wire 26 and the magnetic head terminal portion 3 which face each other in this way
Solder 0 and.

When the board 41 and the relay board 25 are electrically connected with the above-mentioned structure, the connection becomes more reliable.
If the tip of the conductive wire 26 shown in this embodiment is bent upward, the soldering work can be simplified.

[0021]

In the rotary transformer rotor structure of the present invention, a small relay board is attached to the back side of the rotor core in accordance with the mounting position of the magnetic head, and the conductive land provided on the relay board and the terminal portion on the magnetic head side are attached. Since it is electrically connected directly or through a conductive wire, a large relay board covering almost the entire back side of the rotor core, a terminal block with lead pins planted in a plastic base, lead pins and magnetic heads as in the past Since a component such as a lead wire for connecting to and from is not required, the component cost is significantly reduced, the assembly process is extremely simple and easy, the productivity is improved, and the product cost can be reduced. In addition, since the structure for wiring and relay is very simple, it is effective in terms of downsizing and weight reduction of the rotary transformer and the rotary head device.

[Brief description of drawings]

FIG. 1 is a front view of a rotary transformer rotor assembly according to a first embodiment of the present invention.

FIG. 2 is a rear view of the same rotor assembly part.

FIG. 3 is a front view of a rotary transformer rotor assembly according to a second embodiment of the present invention.

FIG. 4 is a rear view of the same rotor assembly part.

[Explanation of symbols]

 20 rotor core 21 coil groove 22 coil winding 23 lead wire drawing groove 24 lead wire 25 relay board 26 conductive wire 27 conductive pattern 28 conductive land 30 terminal portion 40 magnetic head 41 magnetic head substrate 42 magnetic head fixing screw

Claims (2)

(57) [Scope of utility model registration request] 1. A disk-shaped rotor core, in which coil windings are laid in concentric grooves formed on the front side, and a back side of the rotor core, which is bonded according to a mounting position of a magnetic head and has a tip end. A relay board having a portion projecting outward from an outer peripheral edge of the rotor core, the relay board having a pair of conductive lands provided at both ends, and a conductive pattern connecting the conductive lands, A rotor structure of a rotary transformer, wherein a lead wire end of the coil winding is soldered to one conductive land, and a terminal portion on the magnetic head side is directly connected to the other conductive land. 2. The rotor structure of a rotary transformer, wherein the other conductive land has a conductive land on the magnetic head side and one end of a conductive wire whose one end is fixed by soldering. .