JPH0677213U - Rotary transformer of magnetic recording / reproducing device - Google Patents

Abstract

(57) [Summary] [Purpose] To facilitate the assembly work of the rotary transformer and prevent misconnection. [Structure] Four-channel concentric circular grooves 42 are formed in a stator-side core 40, and a coil 44 wound around each groove 42 is formed.
In order to pull out the lead wire of the same in the direction of the printed wiring board 48, the lead wire lead-out grooves 46-1 to 46
-4 is formed. A printed wiring board 48 is adhered to the back surface side of the core 40, and a lead wire connecting portion 52 is provided on the front surface side of the printed wiring board 48. The lead wire 54 has different lengths at the beginning and end of winding. The adhesive layer 50 is the core 4
0 and the printed wiring board 48 are not only adhered to each other but also applied to the vicinity of the lead wire connecting portion 52 so as to protrude.
Strengthening the strength of the printed wiring board 48, the printed wiring board 4
In order to prevent the lead wire 54 connected to 8 from being broken, a reinforcing plate 56 having high rigidity is attached to the back surface of the printed wiring board 48.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a rotary transformer incorporated in a head drum device in a magnetic recording / reproducing device such as a VTR to take out a detection signal of a rotary head such as a video head to the outside of the head drum device.

[0002]

[Prior art]

 FIG. 1 shows an example of the head drum device. A rotary shaft 6 is supported by the fixed drum 2 via a ball bearing 4, and a rotary drum 8 is fixed to the rotary shaft 6. A video head 10 is attached to the rotary drum 8, and a rotary transformer including a rotor 12 and a stator 14 is provided in order to extract a detection signal from the video head 10. The rotor 12 is fixed to the rotating drum 8, is connected to the video head 10, and rotates together with the video head 10. The stator 14 is fixed to the fixed drum 2. In order to take out a signal from the stator 14 to the outside, a printed wiring board 16 is attached to the stator 14, and the stator 14 and the wiring of the printed wiring board 16 are connected.

A motor is provided on the rotary shaft 6 in order to rotate the rotary drum 8 via the rotary shaft 6. In this example, the motor is mounted on the lower end side of the rotary shaft 6, and the motor is provided with a rotor cover 16 fixed to the rotary shaft 6, a rotor magnet 18 provided on the rotor cover 16, and a stator coil 20 fixed to the fixed drum 2. It consists of Reference numeral 22 is a motor printed wiring board for supplying a motor driving current to the stator coil 20.

A conventional example of the stator 14 of the rotary transformer will be described with reference to FIGS. 2 and 3. The core 24 of the stator 14 is formed with grooves 26 in which the coil windings 28 are concentrically formed, and the coil windings 28 are wound in the respective grooves 26. In this example, four grooves 26 are concentrically formed and a four-channel coil winding 28 is wound. In order to guide the lead wire of the coil winding 28 wound around the groove 26 to the printed wiring board 16, two lead wire lead-out grooves 30 extending in a direction crossing the groove 26 are formed. The printed wiring board 16 is attached to the back surface of the core 24 (the side where the groove 26 is formed is the front surface side), and the back surface of the printed wiring board 16 (the core 14 is attached to the printed wiring board 16). The lead wire connecting portion 32 is provided on the front side of the coil winding 28 and the lead wire 34 of the coil winding 28 wound around the groove 26 of the core through the lead wire drawing groove 30. It is drawn out to the wire connection portion 32, and is connected to a predetermined terminal of the printed wiring board 16 by soldering at the lead wire connection portion 32.

[0005]

[Problems to be solved by the device]

 With the structure of the conventional stator as shown in FIGS. 2 and 3, when the lead wire 34 of the coil winding wound in the groove of the core is connected to the printed wiring board 16, the lead wire of FIG. Since the lead wire 34 is connected to the printed wiring board 16 with the surface having the wire connection portion 32 facing upward, it is necessary to surely recognize which channel the lead wire 24 is. If the lead wire 34 is not identified, misconnection occurs.

Further, as shown in FIG. 2, since the lead wire connecting portion 32 faces the fixed drum 2 side, the lead wire connecting portion 32 comes into contact with the fixed drum 2 so as not to leak and is highly accurate. Wiring means are required. As a result, there is a drawback that the number of steps for assembling the rotary transformer increases. Therefore, an object of the present invention is to provide a rotary transformer having a structure capable of facilitating assembly work and reducing the possibility of misconnection.

[0007]

[Means for Solving the Problems]

 In the rotary transformer of the present invention, the stator has a printed wiring board attached to the back surface of the core, and has a lead wire connecting portion on the core-side surface of the printed wiring board. The lead wire from the coil winding is connected to this printed wiring board.

In a preferred embodiment, the adhesive application area for attaching the printed wiring board to the stator-side core is formed to extend from the adhesion area with the core to the vicinity of the lead wire connecting portion. The protruding adhesive application area is used to temporarily fix the lead wire protruding from the coil winding to the lead wire connection part of the printed wiring board to facilitate the connection work. It

In another preferred embodiment, a plurality of lead wire drawing grooves for drawing lead wires from the winding are formed on the surface side of the stator side core, and these lead wire drawing grooves are formed in the coil winding. It is provided independently for each channel and is oriented in the respective wiring direction. In addition, the lead wires extending from the coil windings of the respective channels wound around the stator-side core through the respective lead wire lead-out grooves have different lengths at the beginning and end of winding. In still another preferred embodiment, a reinforcing plate having high rigidity is attached to at least an area of the surface of the printed wiring board opposite to the core side, from the adhesion area to the core to the lead wire connecting portion. .

[0010]

【Example】

 An embodiment will be described with reference to FIGS. 4 and 5. The stator-side core 40 is formed with four concentric circular grooves 42 of four channels as in FIG. As shown in FIG. 5A, in order to draw out the lead wire of the coil 44 wound in each groove 42 toward the printed wiring board 48, the lead wire drawing grooves 46-1 to 46-for each channel are formed. 4 are formed.

A printed wiring board 48 for taking out signals to the outside is adhered to the back surface side of the core 40 (the side where the groove 42 is provided is the front surface side) with an adhesive 50. The lead wire connecting portion 52 is provided on the front surface side (the side where the core 40 is located) of the printed wiring board 48, and the lead wires 54 of the coil windings 44 of the respective channels are the lead wire lead-out grooves 46-1 to 46-. 4 and is taken out onto the printed wiring board 48 and soldered to the respective terminals of the printed wiring board 48 at the lead wire connecting portions 52. The lead wire 54 taken out from the lead wire take-out groove for each channel on the printed wiring board 48 has different lengths at the beginning and end of the winding so that the lead wire 54 has its respective terminals at the lead wire connecting portion 52. The positions of are arranged differently.

The adhesive layer 50 is applied not only in the bonding area between the core 40 and the printed wiring board 48 but also to the vicinity of the lead wire connecting portion 52, and the lead wire 54 is applied to the terminal of the lead wire connecting portion 52. When connecting by soldering, by temporarily fixing the lead wire 54 to the protruding adhesive region 50, the work of connecting the tip of the lead wire and the terminal of the printed wiring board can be facilitated.

As the printed wiring board 48, for example, a flexible printed wiring board can be used. At that time, in order to reinforce the strength of the printed wiring board 48 and prevent the lead wires 54 connected to the printed wiring board 48 from being broken, a reinforcing plate 56 having high rigidity is attached to the back surface of the printed wiring board 48. Has been. The reinforcing plate 56 is attached to the area from the back surface side of the core 40 to at least the lead wire connecting portion 52. A hard plastic sheet is used as the reinforcing plate 56, and for example, a PET (polyethylene terephthalate) sheet or the like can be used.

Although the embodiment has been described as an example in which the present invention is applied to the head drum device shown in FIG. 1, the head drum device to which the rotary transformer of the present invention is applied is limited to that shown in FIG. However, the present invention can be applied to a head drum device of various magnetic recording / reproducing devices such as a stationary VTR, a DAT (digital audio tape recorder) and a camera integrated VTR.

[0015]

[Effect of device]

 In the rotary transformer of the present invention, the printed wiring board is attached to the back surface of the core on the stator side, and the lead wire connecting portion is provided on the core side surface of the printed wiring board. Since the lead wire from the coil winding is connected, the work of connecting the lead wire of the coil winding of the core to the printed wiring board can be done on the same surface. There is no need to pull it around to the back side, and you will not make a mistake in the wiring. In addition, since the lead wire connecting part is on the core side of the printed wiring board, there is no defect in contact with other parts, and there is no need for a highly accurate connecting means, and the number of assembling steps is reduced accordingly.

The lead wire can be temporarily fixed by forming the adhesive application area where the printed wiring board is attached to the stator side core from the adhesion area with the core to near the lead wire connecting portion, Wiring work becomes easy. On the surface side of the stator side core, lead wire lead-out grooves for drawing out the lead wire from the coil winding are provided for each channel of the coil winding, and if it is oriented in each connection direction, the drawn lead wire can be Can be connected.

By winding the lead wires extending from the coil winding of each channel wound around the stator side core through the respective lead wire lead-out grooves, the lengths of the lead wires are made different at the start and end of winding. The start and end of the winding can be easily identified, and misconnection is eliminated. By attaching a reinforcing plate with high rigidity to at least the area from the bonding area to the core to the lead wire connection part on the surface of the printed wiring board opposite to the core side, it is possible to give that part rigidity. Yes, there is no disconnection of the connected lead wire.

[Submission date] August 11, 1993

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be corrected] 0003

[Correction method] Change

[Correction content]

A motor is provided on the rotary shaft 6 in order to rotate the rotary drum 8 via the rotary shaft 6. In this example, the motor is mounted on the lower end side of the rotary shaft 6, and the motor is a rotor cover 17 fixed to the rotary shaft 6, a rotor magnet 18 provided on the rotor cover 17 , and a stator coil 20 fixed to the fixed drum 2. It consists of Reference numeral 22 is a motor printed wiring board for supplying a motor driving current to the stator coil 20.

[Procedure Amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0004

[Correction method] Change

[Correction content]

A conventional example of the stator 14 of the rotary transformer will be described with reference to FIGS. 2 and 3. The core 24 of the stator 14 is formed with grooves 26 in which the coil windings 28 are concentrically formed, and the coil windings 28 are wound in the respective grooves 26. In this example, four grooves 26 are concentrically formed and a four-channel coil winding 28 is wound. In order to guide the lead wire of the coil winding 28 wound around the groove 26 to the printed wiring board 16, two lead wire lead-out grooves 30 extending in a direction crossing the groove 26 are formed. The printed wiring board 16 is attached to the back surface of the core 24 (the side where the groove 26 is formed is the front surface side), and the back surface of the print wiring board 16 (the core 24 is attached to the printed wiring board 16). The lead wire connecting portion 32 is provided on the front side of the coil winding 28 and the lead wire 34 of the coil winding 28 wound around the groove 26 of the core through the lead wire drawing groove 30. It is drawn out to the wire connection portion 32, and is connected to a predetermined terminal of the printed wiring board 16 by soldering at the lead wire connection portion 32.

[Brief description of drawings]

FIG. 1 is a vertical sectional view showing an example of a head drum device.

FIG. 2 is a partial sectional view showing a stator of a conventional rotary transformer together with a fixed drum.

3A and 3B are diagrams showing a stator of a conventional rotary transformer, in which FIG. 3A is a plan view of a coil winding side, and FIG.

FIG. 4 is a partial cross-sectional view showing a stator of a rotary transformer of one embodiment together with a fixed drum.

5A and 5B are views showing a stator of the rotary transformer of the embodiment, FIG. 5A is a plan view of a coil winding side, and FIG.

[Explanation of symbols]

 2 Fixed Drum 8 Rotating Drum 40 Core of Stator 42 Coil Winding Groove 44 Coil 46-1 to 46-4 Lead Wire Extracting Groove 48 Printed Wiring Board 50 Adhesive 52 Lead Wire Connecting Section 54 Lead Wire 56 Reinforcing Plate

Claims (5)

[Scope of utility model registration request] 1. A head drum device of a magnetic recording / reproducing apparatus, comprising: a stator mounted on a fixed drum; and a rotor mounted on a rotary drum, connected to a rotary head, and arranged to face the stator. In a rotary transformer in which cores of the stator and the rotor are opposed to each other on the surface side, concentric circular grooves are provided on the opposed surfaces, and coil windings are provided in the grooves, the stator is a core. The printed wiring board is attached to the back side of the, and the core side surface of the printed wiring board has a lead wire connecting part, and the lead wire connecting part is the lead wire protruding from the coil winding of the core of this stator. A rotary transformer that is connected to this printed wiring board. 2. The adhesive application area for adhering the printed wiring board to the core on the stator side is formed so as to protrude from the adhesion area with the core to near the lead wire connecting portion. Rotary transformer. 3. A plurality of lead wire drawing grooves for drawing lead wires from a winding are formed on the surface side of the stator side core, and the lead wire drawing grooves are independent for each channel of the coil winding. The rotary transformer according to claim 1 or 2, wherein the rotary transformers are provided so as to face each other in the connecting direction. 4. The lead wires extending from the coil winding of each channel wound around the stator side core through the respective lead wire lead-out grooves have different lengths at the beginning and end of winding. The rotary transformer according to item 3. 5. A reinforcing plate having high rigidity is attached to at least a region extending from a bonding region to the core to a lead wire connecting portion on a surface of the printed wiring board opposite to the core side. The rotary transformer described in 4.