JP2667797B2 - Printed circuit board fixing device for capstan motor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a printed circuit board fixing device applicable to a VCR capstan motor, and more particularly, to a printed circuit board on which a circuit element for driving a capstan motor is mounted. The present invention relates to a device fixed to a casing.

[0002]

2. Description of the Related Art Generally, capstan motors used in tape recorders, camcorders, etc., are shown in FIG.
A rotor yoke 11 is press-fitted and fixed to the upper outer peripheral surface in the figure of the rotor shaft 10 that rotates forward or reverse when a current is applied,
A magnetron 12 that forms a predetermined magnetic field is attached inside the rotor yoke 11.

The rotor shaft 10 is rotatably fixed by a bearing 13 which facilitates rotation, and the bearing 13 is supported and fixed by a bearing holder 14.

On the other hand, a stator core 15 is provided on the outer peripheral surface of the bearing holder 14 so as to maintain a predetermined distance from the magnetron 12 attached to the rotor yoke 11, and a coil 16 is wound around the stator core 15. Has been done.

[0005] The stator core 15 is supported and fixed by a support 17, and the support 17 is connected to and fixed to an upper portion of an iron plate 18 serving as a heat radiator in the drawing.

On the other hand, the iron plate 18 is
4, the iron plate 18 and the support 1
7 and the stator core 15 are connected together by a screw 19. A printed circuit board 20 is fixed to one side of the upper side of the iron plate 18 in the figure by rivets 21. To briefly summarize the above structure, the printed circuit board 20 directly
It can be seen that they are not connected to the motor casing but are connected through the iron plate 18.

[0007] The printed circuit board mainly uses a phenolic resin laminate, because when a screw is inserted, the printed circuit board is easily broken and the fastening force of the screw cannot be maintained.

Therefore, the structure shown in FIG. 4 shows a motor in which the printed circuit board 20 and the iron plate 18 are joined with a screwless rivet and then the iron plate 18 is mounted on the motor casing. That is, the motor casing and the printed circuit board 20 are coupled to each other through the iron plate 18.

[0009]

However, conventionally, when the pitch between the ridges of the screw 19 is, for example, 0.45 t and the thickness of the iron plate 18 is 0.5 t, the iron plate 18 has a thickness of 0.5 t. Has a problem that the fastening force of the screw 19 is reduced because only about one peak of the screw 19 enters.

As a result, there is a risk that the bonding force of the printed circuit board 20 is reduced, and the printed circuit board 20 is weakened against vibration and easily separated even with a small impact. In addition, there is a problem in that the production cost increases due to the complexity of the fastening structure (in this case, rivets and screws), the number of work steps in the joining process increases, and the productivity decreases.

An object of the present invention is to provide an apparatus for fixing a printed circuit board of a capstan motor in which a printed circuit board and an iron plate are joined together to a motor casing using one screw to simplify the operation and improve the fastening force. To do.

[0012]

In order to achieve the above object, a printed circuit board fixing device for a capstan motor according to a first aspect of the present invention has a through hole having a constant diameter as the printed circuit board. A tap hole having a constant diameter formed around a burr having a constant height formed by burring is formed in the iron plate, and the tap hole is formed in the through hole for coupling the printed circuit board and the iron plate. It is configured to be fastened by a screw while being inserted into the hole. Therefore, the printed circuit board and the iron plate are connected to the motor casing using one screw, so that the operation can be simplified and the fastening force can be improved.

A second aspect of the present invention is summarized in that the through hole of the printed circuit board is larger than the tap hole of the iron plate. Therefore, the fastening force can be increased, the reliability of the product can be increased, the work efficiency can be improved, and the productivity can be improved.

According to a third aspect of the present invention, in order to prevent a burr around a tap hole of the iron plate inserted in the through hole of the printed circuit board from shaking the printed circuit board, the through hole is formed in the through hole. The point is that they are inserted closely. Therefore, since the burrs formed on the iron plate are tightly coupled to the inside of the through holes of the printed circuit board, the fastening force between the printed circuit board and the iron plate can be improved.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A preferred embodiment of the apparatus for fixing a printed circuit board of a capstan motor according to the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a sectional view showing a capstan motor according to the present invention. When a current is applied to a capstan motor 30, a rotor yoke 32 is press-fitted and fixed to an upper outer peripheral surface of a rotating rotor shaft 31 in the drawing. Inside the rotor yoke 32, a magnetron 33 for forming a predetermined magnetic field is provided.
Is attached.

Bearings 34 are mounted above and below the outer peripheral surface of the rotor shaft 31. A bearing holder 35 is provided outside the bearing 34 to support and fix the bearing 34.

On the other hand, a stator core 36 is provided on the outer peripheral surface of the bearing holder 35 so as to maintain a predetermined distance from the magnetron 33 attached to the rotor yoke 32, and a coil 37 is wound around the stator core 36. There is.

The stator core 36 is supported and fixed by a support 38. A printed circuit board 39 and an iron plate 41 are connected to the support 38 by screws 42.

The printed circuit board 39 applies a predetermined current to the stator coil 37 to form a rotating magnetic field. The rotating magnetic field interacts with the magnetic field of the magnetron 33 attached to the rotor yoke 32 to rotate the rotor yoke 32.

On the other hand, the connection between the printed circuit board 39 and the iron plate 41 is as shown in FIG.
A predetermined size through hole 36a is formed in the stator core 36.
Are formed. Further, through holes 38a, 39a are also formed in the support base 38 and the printed circuit board 39.

The iron plate 41 is formed with a tap hole 41a having a diameter smaller than that of the through hole, and the screw 42 is ultimately fastened to the tap hole 41a of the iron plate.

Burrs can be artificially formed in the tap hole 41a during hole processing (this is referred to as burring). The shape and role of the burr are shown in FIG.
, (B).

FIG. 3A shows that burrs around the tap hole 41 have been inserted into the through holes 39 a of the printed circuit board 39. Therefore, the through hole 3
9a is required to be at least larger than the thickness of the burr than the tap hole 41a.

As described above, the thickness of the iron plate 41 is substantially increased (about 1.5 to 2 times), and an appropriate fastening force can be obtained at the time of screw fastening. FIG. 3B shows the state after the screw is fastened.

Further, if the processing is performed so that there is no gap between the burr and the through hole 39a of the printed circuit board 39, a secondary effect of preventing the printed circuit board 39 from swaying left and right after fastening the screw is also obtained. To be

According to the present invention, the stator core 36 and the support 3
8. Then, the iron plate 41 should be joined using one fastening structure, and the printed circuit board 39 should be joined to the iron plate 41 using one fastening structure. Solved using only one connecting member.

Further, the screw 42 is attached to the printed circuit board 39.
Is solved, the problem that the printed circuit board 39 cannot withstand the fastening force of the screw 42 due to the characteristics of the printed circuit board 39 and is easily broken.

As described above, according to the apparatus for fixing the printed circuit board 39 of the capstan motor 30 according to the present invention, the printed circuit board 39 and the iron plate 41 can be easily formed by one screw 42 without requiring a separate fixing member. By being connected, there is an effect that the fastening force can be enhanced, the reliability of the product can be increased, the work efficiency can be improved, and the productivity can be improved.

Further, since the burrs formed on the iron plate are closely bonded to the inside of the through holes of the printed circuit board, the fastening force between the printed circuit board and the iron plate can be improved.

[0031]

As described above, the printed circuit board fixing device for a capstan motor according to the first aspect of the present invention has a through hole having a fixed diameter formed in the printed circuit board, and a burr having a fixed height is formed around the printed circuit board. A tap hole having a constant diameter is formed in the iron plate, and the tap hole is inserted into the through hole and fastened by a screw, so that the printed circuit board and the iron plate are formed using one screw. There is an effect that the work can be simplified and the fastening force can be improved by connecting the motor and the motor casing together.

According to a second aspect of the present invention, since the through hole of the printed circuit board is larger than the tap hole of the iron plate, the fastening force is enhanced, the reliability of the product is improved, the work efficiency is improved, and the productivity is improved. be able to.

According to a third aspect of the present invention, a burr around a tap hole of the iron plate inserted into the through hole of the printed circuit board is closely inserted into the through hole to prevent the printed circuit board from shaking. Thus, the fastening force between the printed circuit board and the iron plate can be improved.

[Brief description of the drawings]

FIG. 1 is a sectional view of a printed circuit board fixing device according to the present invention.

FIG. 2 is an enlarged view of a portion X shown in FIG.

FIG. 3A is a state diagram before the printed circuit board and the iron plate are fastened, and FIG. 3B is a state diagram after the printed circuit board and the iron plate are fastened.

FIG. 4 is a sectional view of a conventional printed circuit board fixing device.

[Explanation of symbols]

 Reference Signs List 30 capstan motor 31 rotor shaft 32 rotor yoke 33 magnetron 34 bearing 35 bearing holder 36 stator core 36a, 38a, 39a through hole 37 coil 38 support base 39 printed circuit board 41 iron plate 41a tap hole 42 screw

Claims (3)

(57) [Claims] 1. A capstan motor having a housing, an iron plate attached to the housing, and a printed circuit board, wherein a through hole having a fixed diameter is formed in the printed circuit board and a fixed height formed by burring. A tap hole of a certain diameter having a burr around the iron plate is formed in the iron plate, and the tap hole is fastened by a screw in a state where the tap hole is inserted into the through hole to connect the printed circuit board and the iron plate. A printed circuit board fixing device for a capstan motor. 2. The printed circuit board fixing device for a capstan motor according to claim 1, wherein a through hole of the printed circuit board is larger than a tap hole of the iron plate. 3. The method according to claim 1, wherein a burr around a tap hole of the iron plate inserted into the through hole of the printed circuit board is closely inserted into the through hole to prevent the printed circuit board from shaking. The printed circuit board fixing device for a capstan motor according to claim 1.