JPH036140Y2 - - Google Patents

Description

[Detailed explanation of the invention] [Purpose of the invention] (Field of industrial application) This invention relates to a flat motor used in tape recorders, etc., and is designed to be ultra-flat while also achieving electrical neutral point adjustment. It is made easy to do.

(Prior Art) A conventional flat motor is shown in FIG. That is, a ring-shaped magnet 2 is placed on a disc-shaped bracket 1, and this magnet 2
A flat rotor 4 with an integrated armature coil is arranged in the gap formed between the upper surface and the inner ceiling of the case 3, and a commutator 5 is attached to the rotor 4 and the brush base 6 is connected to the bracket 1. A rectifying device 567 consisting of a pair of brushes 7, 7 fixed to each other is arranged inside the magnet 2. In the figure, 8, 9 are press-fitted into the case 3 and the bracket 1, and are connected through the shaft 10. This is an oil-impregnated bearing that supports the rotor 4.

(Problems to be Solved by the Invention) Although the flat motor having such a configuration has a simple structure, it has the disadvantage that the electrical neutral point cannot be adjusted, as can be seen from the drawings. In other words, the positions of the magnets and brushes are fixed, and therefore the positions of the commutator pieces and the armature coil of the rotor must be kept constant, but the motor itself is small (for example, the inside of a tape mechanism of the size of a compact cassette). In flat motors (such as those mounted on motors), the commutator was also made as small as possible, and it was extremely difficult to maintain a constant positional relationship during assembly, leading to a decline in yield.

In order to avoid such drawbacks, the applicant of the present application
First, as shown in FIG.
and the iron magnetic circuit board 12 between the bracket 11
By fixing the magnetic circuit board 12 and the ring-shaped magnet and adjusting the rotation of the bracket 11 on which the brush base 6 is placed, the relative position of the magnetic pole of the magnet 2 and the brushes 7, 7 can be changed. We have proposed a configuration in which the electrical neutral point is adjusted by

This configuration has been well-received as being extremely superior for flat motors with a height of about 8 mm, but when ultra-flat motors with a height of about 5 to 6 mm are required, magnetic circuit boards are becoming more popular. I'm getting used to it.

(Purpose) This invention aims to provide a flat motor in which an electrical neutral point can be easily obtained without using a magnetic circuit board.

[Structure of the invention] (Means for solving the problem) Therefore, the flat motor of this invention has a bracket 13.
A bearing 99 is provided in the center of the
A plurality of circular arc holes 16 consisting of an insertion portion 14 and a narrow width portion 15 following the insertion portion 14 are provided on the outside of the brush base 66, and a magnet 2 is fixed to the outside of the circular arc holes 16. .
The brush base 66 is semi-fixed to the bracket 13 by fitting the protrusion 17 into the insertion portion 14 and locking the locking portion 18 to the narrow width portion 15. The portion 15 is provided with a recess 166 in which the locking portion 18 is housed.

(Function) With this structure, the brush base can be partially attached to the bracket by fitting the protrusion into the insertion part and rotating it, and after taking the electrical neutral point, the locking part is locked in the narrow part. It can be fixed.

In addition, since the locking portion can be stored in the recess, it can be made flat for a better appearance.

(Example) Hereinafter, the configuration of this invention will be explained based on an example shown in the drawings.

Fig. 3 shows the bracket and brush base that are the features of this invention.The bracket 13 has a bearing 99 in the center, and an insertion part 14 and a predetermined length extending outside the bearing 99. A pair of circular arc holes 16, 16 each having a narrow width portion 15 are provided concentrically with the bearing, and a recess 166 having approximately the same size as the insertion portion 14 is provided around the narrow width portion 15.

A ring-shaped magnet 2 similar to the conventional one is fixed to the outside of the arcuate hole 16. on the other hand,
The ring-shaped brush base 66 has a pair of brushes 7, 7 planted on one side, and a protrusion 17 facing the circular arc hole on the other side. A locking portion 18 is provided. Then, this protrusion 17 is fitted into the insertion part 14 of the circular arc hole 16 arranged in the bracket 13 and rotated, and after the electrical neutral point is established, the locking part 18 is locked to the narrow width part 15. Accordingly, the brush base 66 is semi-fixed to the bracket 13.

To adjust the electrical neutral point, it is sufficient to change the relative position of the magnet 2 and the brush base 66, but as shown in FIG. This can be easily done by rotating the locking part 18 using the locking mechanism. At this time, it is more convenient to set the rotation of the brush base 66 a little more tightly in terms of holding power. In addition, if the holding force is a concern after adjusting the electrical neutral point,
Adhesive 19 may be filled into recess 166 as shown in FIG. In such a case, it is convenient to provide the recess 166, which has the advantage of not sacrificing appearance or posture. Furthermore, instead of adhesion, a brush base made of resin may be welded.

[Effects of the invention] Since the flat motor according to this invention is constructed as described above, the electrical neutral point can be easily adjusted without increasing the number of parts, and a magnetic circuit board is not required, making it extremely flat. can be converted into

Further, by providing a recess, the locking portion will not protrude outward even if fixed with adhesive, so a low posture and appearance can be maintained.

[Brief explanation of drawings]

Fig. 1 is a sectional view of the main parts showing the general configuration of a conventional flat motor, Fig. 2 is a sectional view of the main parts of another conventional embodiment, and Fig. 3 is an embodiment of the flat motor of the present invention. FIG. 4 is an enlarged perspective view of the main parts assembled, and FIG. 4 is an enlarged sectional view of the main parts. 2 is a magnet, 7 and 7 are brushes, 13 is a bracket, 14 is an insertion part, 15 is a narrow part, 16 is an arcuate hole, 17 is a protrusion, 18 is a locking part, and 99 is a bearing.

Claims (1)

[Claims for Utility Model Registration] (1) A bearing 99 is provided at the center of the bracket 13, and a plurality of circular arc holes 16 are provided outside of the bearing 99, each consisting of an insertion portion 14 and a narrow portion 15 following the insertion portion 14.
Further, the magnet 2 is fixed to the outside of the circular arc hole 16, and the brushes 7, 7 are installed on one side of the brush base 66, and the insertion portion of the circular arc hole 16 of the bracket 13 is installed on the other side. A protrusion 17 that fits into the 14 is provided, and the protrusion 17
The brush base 66 is provided with a locking portion 18 that locks on the narrow width portion 15, and by fitting the protrusion 17 into the insertion portion 14 and locking the locking portion 18 on the narrow width portion 15. Bracket 13
Flat motor semi-fixed to. (2) The narrow part 15 has a recess 1 in which the locking part 18 is stored.
Scope of Claims for Utility Model Registration No. 66
Flat motor described in section.