JPH0545090Y2 - - Google Patents

Description

[Detailed Description of the Invention] The coil unit of the present invention will be explained according to the following items.

A. Industrial application field B. Overview of the invention C. Prior art [Figures 7 and 8] D. Problems that the invention attempts to solve [Figures 7 and 8]
[Fig. 8] E Means for solving the problem F Example [Fig. 1 to Fig. 6] a Coil unit [Fig. 1 to Fig. 5] a-1 Coil body [Fig. 1, Fig. 2 , 5th
Figure] a-2 Connector unit [Figures 1 to 5
] a-3 Connection of coil body and connector unit [Fig. 2, Fig. 5] b Usage example [Fig. 5, Fig. 6] b-1 Fixed drum [Fig. 5] b-2 Rotating drum [Fig. Figure 5] c Printed circuit board [Figures 5 and 6] c-1 Connection between coil unit and printed circuit board [Figure 5] G Effects of the invention (A Field of industrial application) The present invention is a novel coil Regarding units. Specifically, the present invention relates to a coil unit suitable for use in a brushless motor, and aims to provide a new coil unit that can be made smaller in diameter and, therefore, the device itself that uses it can be made smaller. .

(B Overview of the invention) The coil unit of the invention is a means for supplying power to each coil of a coil body having a plurality of coils, such as a connector unit for connecting between a flexible printed circuit board and the coil body. is composed of a cylindrical holding body and a plurality of terminal pins held by the holding body, the terminal pin is formed so that the contact part and the pin part are continuous in an L-shape, and the pin part is connected to the holding body. is passed through in the axial direction of the holder, with its tip protruding from one end surface forming a flat surface of the holder, and the contact portion is placed along the other end surface of the holder in the tangential direction of a circle centered on the axis of the holder. This allows the contact portion of the terminal pin to fit within a small outer diameter, without reducing the effective area of the coil due to the smaller diameter of the contact portion of the terminal pin. The diameter of the unit can be reduced.

(C Prior Art) [Figures 7 and 8] For example, a video tape recorder (hereinafter referred to as
It's called "VTR." ), digital audio tape recorders (hereinafter referred to as "DAT"), etc., often use a flat so-called brushless motor as a motor for rotating a rotating drum in order to make the shape thinner.

7 and 8 show different examples of conventional rotary head devices equipped with such motors.

FIG. 7 shows an example of a rotary head device a of a so-called lower drum rotation type having a rotating drum on the lower side and a fixed drum on the upper side.

b is a rotating drum with a mounting hole c formed in its axial center, and bearings d, at both ends of the mounting hole c;
d is press-fitted.

Denoted at e is a support shaft fixed to a mechanical chassis (not shown), and its approximately middle portion is press-fitted into the bearing portions d, d, whereby the rotating drum b is attached to the support shaft e.
is rotatably supported.

A fixed drum f is fixed to the upper end of the support shaft e.

A rotor magnet g is fixed to the rotating drum b together with the back yoke.

A rotating yoke h is fixed to the rotating drum b in a state facing the rotor magnet g described above.

i, i is a coil body in which a plurality of coils (not shown) are arranged in an annular shape surrounding the support shaft e, and the coil arrangement portion is located between the rotor magnet g and the rotating yoke h, and the coil body is located between the rotor magnet g and the rotating yoke h, and Supported parts j, j, .

FIG. 8 shows an example of a so-called upper drum rotating type head device in which a rotating drum is arranged at the upper part and a fixed drum is arranged at the lower part.

Denoted by m is a rotating drum, and bearings o, o are press-fitted into both ends of a mounting hole n provided at the axial center of the drum.

P is a support shaft erected from a mechanical chassis (not shown), and the bearings o, o are press-fitted onto the support shaft p, whereby the rotary drum m is rotatably supported by the support shaft p.

q is a fixed drum whose center portion is fixed to a support shaft p.

r is a rotor magnet fixed to the rotating drum m.

A rotating yoke s is fixed to the upper end of the rotating drum m, and faces the rotor magnet r in parallel with a space therebetween.

t is a coil body in which a plurality of coils (not shown) are arranged so as to surround the support shaft p, and the coil arrangement part is located between the rotor magnet r and the rotating yoke, and the center part is connected to the support shaft p. It is fixed to the axis p.

u is a cylindrical connector unit, L
Letter-shaped terminal pins v, v, . . . are held, and horizontally extending contact portions w, w, . It protrudes outward from the outer periphery.

The connector unit u has terminal pins v,
The tips of the contact parts w, w, ... of v, ... are power feeding contacts x, x,
..., and the upper ends of the pin parts y, y, ... of the terminal pins v, v, ... are soldered to the contacts of the printed circuit board z, thereby connecting the coil of the coil body t and the printed board z. An electrical connection will be made between the two.

(D. Problem that the invention attempts to solve) [Figure 7,
[FIG. 8] However, in the case of conventional rotary head devices, there is a problem in that both types a and l described above can only be downsized to an outer diameter of about 30 mm at most.

That is, the lower drum rotating type rotary head device a
In this case, the coil support parts k, k, ... provided outside the outer diameter of the drum increase the outer diameter of the entire rotary head device, and the coil support parts k,
k, . . . imposes a positional restriction on the arrangement of other mechanisms, such as the loading mechanism.

In addition, the upper drum rotation type rotary head device l
In this case, there is no need to increase the outer diameter of the device as described above, but since the outer diameter of the coil body cannot be reduced, the drum cannot be made smaller in diameter.

In other words, the contact parts w, w, between the terminal pins v, v, ... provided on the coil body t and the connector unit u,
Since ... is soldered to the power supply contacts x, This is because, in order to avoid this, the outer diameter of the coil body t must be increased.

Furthermore, in this type l, the connector unit u
A space A is formed between the printed circuit board z and the printed circuit board z, and most of the connection parts of the printed circuit board z are in a floating state. Another problem is that the substrate cannot be held reliably near the center.

(E. Means for Solving Problems) Therefore, in order to solve the above-mentioned problems, the coil unit of the present invention provides a means for feeding power to each coil of a coil body including a plurality of coils, such as a flexible A connector unit for connecting between a printed circuit board and a coil body is composed of a cylindrical holder and a plurality of terminal pins held by the cylindrical holder. The pin part is passed through the holder in the axial direction, and its tip protrudes from one flat end face of the holder, and the contact part is connected to the other end of the holder. It is positioned so as to extend along the end face and in the tangential direction of a circle centered on the axis of the holder.

Therefore, according to the coil unit of the present invention, since the contact portion of the terminal pin can be accommodated within a small outer diameter, the effective area of the coil can be reduced by the smaller arrangement diameter of the contact portion of the terminal pin. It is possible to reduce the diameter of the coil unit without causing any damage.

Therefore, for example, when the coil unit of the present invention is used in a brushless motor, it is possible to downsize the device using the brushless motor. For example, when applied to a rotary head device such as the above-mentioned A and I, the outer diameter of the device, which was conventionally limited to about 30 mm, can be reduced to about half that diameter, 15 mm. Moreover, the brushless motor using the coil unit of the present invention can be applied to either a lower drum rotating type or an upper drum rotating type rotating head device.

Further, since one end of the connector unit is formed into a flat surface, the connecting portion of the power supply printed circuit board can be stably placed on the flat surface.

(Embodiment F) [Figs. 1 to 6] Details of the coil unit of the present invention will be described below with reference to the embodiments shown in the accompanying drawings.

(a Coil unit) [Figs. 1 to 5] Reference numeral 1 denotes a coil unit, which is composed of a coil body having a plurality of coils and a connector unit.

(a-1 Coil body) [Fig. 1, Fig. 2, Fig. 5] 2 is a coil body.

Reference numeral 3 denotes a circular belt-shaped connection part, and power supply contacts 5, 5, .

6, 6, . . . are coils arranged in a ring surrounding the connection portion 3, and each coil 6, 6, . It's summery.

The coil body 2 has a connecting portion 3 and a coil 6,
6,... are formed integrally or integrally combined.

There are various ways to manufacture such a coil body 2.
For example, several layers, for example, three
It can be formed by laminating layers. In addition, it is possible to form the coil base by various methods, such as preparing a coil base on which power supply contacts and the like are printed, and placing and fixing a coil formed by coiling a thin wire on the coil base.

(a-2 Connector unit) [Figures 1 to 5
Figure] 7 is a connector unit, which consists of a connector holder and a connector pin.

Reference numeral 8 designates a connector holder made of insulating synthetic resin, which is cylindrical in shape, with a central hole 9 formed in the center, and one surface 10 of which is flat.
The other surface 11 is formed into a substantially flat surface.

On the other surface 11 of the connector holder 8, there are shallow recesses 12, 1 extending from the outer edge to a position close to the center hole 9 at positions equally spaced apart in the circumferential direction.
2,... are formed.

13, 13, . . . are connector pins, which include pin portions 13a, 13a, . . . extending in the vertical direction and contact portions 13b, 13b, . are integrally formed in an L-shape. These connector pins 13, 13, . . . are the pin portions 13, 13, .
a, 13a, ... the other half is the connector holder 8
The pin portions 13a, 13a, . . .
a half of which protrudes from one side 10, and
The contact portions 13b, 13b, . . . are located within the recesses 12, 12, . and,
These contact portions 13b, 13b, . . . are arranged so as to extend in the tangential direction of a circle centered on the center of the connector holder 8 when viewed from above.

In addition, the connector holder 8 and the connector pin 13,
13, . . . are integrated by, for example, outsert molding.

(a-3 Coupling the coil body and connector unit) [Figures 2 and 5] Therefore, the connector unit 7 is stacked on one side of the coil body 2 so that the center holes 4 and 9 are aligned with each other. Then, connect the connector pins 13,1
The contact portions 13b, 13b, . . . of the coil body 2 are connected to power supply contacts 5, 5, .

Reference numeral 14 denotes a synthetic resin sleeve having a circular tube shape, which is press-fitted into the center hole 9 of the connector unit 7 and the center hole 4 of the coil body 2, and has one end protruding from one surface 10 of the connector unit 7. Also,
The other end also slightly protrudes from the coil body 2. Thereby, the coil body 2 and the connector unit 7 are reliably connected. The sleeve 14, the coil body 2, and the connector unit 7 can be connected not only by press fitting, but also by using adhesive means, ultrasonic heat fusion means, etc. Furthermore, the connector holder 8 and the sleeve 14 may be integrally formed.

(b. Example of use) [Figs. 5 and 6] Next, an example of use in which the coil unit 1 of the present invention is used in a rotary head device will be described.

15 is a rotary head device such as a VTR or DAT. The rotating head device comprises a fixed drum, a rotating drum provided with a magnetic head, a support shaft fixed to the fixed drum and supporting the coil unit 1 according to the present invention, a rotary transformer, etc.

(b-1 Fixed drum) [Figure 5] 16 is a fixed drum.

The fixed drum 16 is formed in the shape of a thick disk, and has a circular belt-shaped recess 17 that is open on the lower surface, and a boss 18 surrounded by the recess 17 is formed in the center. A mounting hole 19 is provided through the center of the fixed drum 16.
Further, an annular protrusion 20 is formed on the lower end surface of the boss portion 18 in proximity to the attachment hole 19.

Reference numeral 21 denotes a drum support that is erected from a mechanical chassis (not shown), and the upper surface of the fixed drum 16 is fixed to the upper piece 21a of the drum support 21.

Reference numeral 22 denotes a support shaft, the upper end of which is press-fitted into the mounting hole 19 of the fixed drum 16.

(b-2 Rotating drum) [Figure 5] 23 is a rotating drum.

The rotating drum 23 is formed into a thick disk shape, and has a shallow recess 24 formed on its upper surface, and
A boss portion 25 is provided protruding from the center of the lower surface. In addition, recesses 26 and 2 are provided at the center of the upper surface and the lower surface of the boss portion 25.
7 is formed, and ball bearings 28, 28' are supported in the respective recesses 26, 27. still,
The outer races 28a, 28'a of each ball bearing 28, 28' are press-fitted into the recesses 26, 27. Note that an insertion hole 23a is formed between the recesses 26 and 27, so that the recess 2
Outer races 28a, 28' between 6 and 27
A shelf portion 23b having a thickness of a is formed.

A head substrate 29 is disposed in a shallow recess 24 formed on the upper surface of the rotating drum 23, and magnetic heads 30, 30 for recording and reproduction are supported on the outer peripheral edge of the head substrate. The outer end of the rotary drum 23, that is, the portion where the head gap is formed, is located in substantially the same plane as the outer peripheral surface of the rotating drum 23.

31 is a back yoke whose outer diameter is slightly smaller than the outer diameter of the rotating drum 23;
The rotating drum 2 is fitted onto the boss portion 25 of 3.
It is fixed to the bottom surface of 3.

A main magnet 32 is fixed to the lower surface of the back yoke 31, and its outer diameter is slightly smaller than the outer diameter of the back yoke 31.

Reference numeral 33 denotes a cylindrical yoke holder, in which the rotating drum 2
3, and its height is the same as that of the back yoke 31 and the main magnet 32.
It is larger than the thickness of .

34 is a rotating yoke attached slightly above the lower end of the yoke holder 33;
The rotary yoke 34 extends from the inside of the magnet 3 toward the center and faces the main magnet 32 in parallel.
At a position slightly closer to the yoke holder 33 than the center part, there is a sensor for detecting the rotational phase of the rotating drum 23.
PG (pulse generator) magnet 35,3
5' is attached.

The above-mentioned rotating drum 23 is rotatably supported on the support shaft 22 by inserting the portion of the support shaft 22 protruding from the lower end of the boss portion 18 of the fixed drum 16 into the ball bearings 28, 28' supported thereon. be done. In addition, ball bearing 28,2
8' inner race 28b, 28'b and support shaft 2
2 is such that sliding is allowed between them.

The sleeve 14 of the coil unit 1 is fixed by adhesive below the portion of the support shaft 22 where the rotating drum 23 is supported. At this time, the sleeve 14 is pressed upward and pressurization is applied to the ball bearings 28, 28'. That is, when the sleeve 14 is pressed upward, the inner race 28b of the upper ball bearing 28 is pressed against the protrusion 2 formed at the lower end of the boss portion 18 of the fixed drum 16.
The outer race 28 is pushed downward by
a is prevented from moving downward by the shelf 23b between the recesses 26 and 27, and the inner race 28'b of the lower ball bearing 28' is prevented from moving upward by the upper end of the sleeve 14. Although pushed, the outer race 28'a is prevented from moving upward by the shelf 23b, so that pressurization is applied to the two ball bearings 28, 28'.

Note that 36 is a rotary transformer, and the rotary transformer 36 includes a fixed side coil part 37 provided in the recess 17 on the lower surface of the fixed drum 16 and a rotating side coil part provided on the head board 29 of the rotating drum 23. It consists of 38.

(c Printed circuit board) [Figures 5 and 6] Reference numeral 39 is a flexible printed circuit board as a means for feeding power to the coils 6, 6, . . . It consists of an extension part 41 (only a part of which is shown in the drawing) that extends continuously from a part of the periphery.

A center hole 40a approximately equal to the outer diameter of the sleeve 14 of the coil unit 1 is formed in the center of the connecting portion 40, and around the center hole 40a are pins of the connector pins 13, 13, . . . of the connector unit 7. The power supply conductor 4 is formed on the flexible printed circuit board 39 through which the portions 13a, 13a, . . . are inserted.
Connection holes 43, 43, . . . are formed to be electrically connected to 2, 42, .

The power supply conductors 42, 42, . . . are connected to a drive control circuit (not shown).

44 is connector unit 7 of coil unit 1
and the flexible printed circuit board 39, and its shape is similar to that of the printed circuit board 39.
The shape of the connecting portion 40 is approximately the same as that of the connecting portion 40 of
A center hole 44a and an insertion hole 4 are provided at positions corresponding to the center hole 40a and the connection holes 43, 43, . . . , respectively.
4b, 44b, . . . are formed.

(c-1 Connection between coil unit and printed circuit board) [Figure 5] Therefore, coil unit 1 and printed circuit board 3
Connection with 9 is made as follows.

First, the sleeve 14 of the coil unit 1 is inserted into the center hole 44a of the reinforcing plate 44, and the pin portions 13a, 13a, . . . of the connector pins 13 are inserted into the insertion holes 44b, 44b, . After the reinforcing plate 44 is attached to the connector holder 8
It is attached in close contact with one end surface 10.

Similarly, the center hole 40a of the connection part 40 of the flexible printed circuit board 39 and the connection hole 4
3, 43, . . . the sleeve 14 and the pin portions 13a, 13a, . . . of the connector pins 13, 13, .
After each of the connector pins 13, 13,
The pin parts 13a, 13a, ... and the connection hole 4
Power supply conductors 42, 42, around 3, 43, ...
... is soldered between.

In this way, the printed circuit board 39 is fixed to the coil unit 1, and the coils 6, 6, . . . are electrically connected to a drive control circuit (not shown).

(G. Effect of the invention) As is clear from the above description, the coil unit of the present invention has a plurality of coils arranged in a ring around the connection part located at the center, and each of the above-mentioned coils is arranged on one side of the connection part. It consists of a coil body in which a power supply contact to the coil is formed, and a plurality of terminal pins held in a cylindrical holding body.The terminal pin has a contact part and a pin part connected in an L-shape, and the pin part penetrates the holder in the axial direction, and its tip protrudes from one end surface forming a flat surface of the holder, and the contact portion extends in a circle centered on the axis of the holder along the other end surface of the holder. and a connector unit positioned so as to extend in the tangential direction of the coil body, and the coil body and the connector unit are fixed in a state in which the contact portion of the terminal pin of the connector unit is in contact with the power supply contact of the coil body.

Therefore, according to the coil unit of the present invention, since the contact portion of the terminal pin can be accommodated within a small outer diameter, the effective area of the coil can be reduced by the smaller arrangement diameter of the contact portion of the terminal pin. It is possible to reduce the diameter of the coil unit without causing any damage.

Therefore, for example, when the coil unit of the present invention is used in a brushless motor, it is possible to downsize the device using the brushless motor. For example, when applied to a rotary head device such as the above-mentioned A and I, the outer diameter of the device, which was conventionally limited to about 30 mm, can be reduced to approximately half that diameter, ie, 15 mm. Furthermore, the brushless motor using the coil unit of the present invention can be applied to either a lower drum rotation type or an upper drum rotation type rotary head device.

Further, since one end of the connector unit is formed into a flat surface, the connecting portion of the power supply printed circuit board can be stably placed on the flat surface.

In the above-described embodiments, the coil unit of the present invention is used in a rotary head device, but this does not mean that the coil unit of the present invention can be used only in a rotary head device.

[Brief explanation of drawings]

Figures 1 to 4 show an example of the implementation of the coil unit of the present invention, with Figure 1 being an exploded perspective view, Figure 2 being a perspective view, Figure 3 being a plan view of the connector unit, and Figure 4 being an exploded perspective view. A sectional view taken along the - line in Fig. 3, and Figs. 5 and 6 show examples of use of the coil unit of the present invention. Fig. 5 is a longitudinal sectional view, and Fig. 6 is a plan view of the power feeding means to the coil. 7 and 8 are vertical sectional views showing different examples of a conventional coil unit and its usage. Explanation of symbols, 1... Coil unit, 2... Coil body, 3... Connection section, 5... Power supply contact, 6...
Coil, 7... Connector unit, 8... Holder, 10... One end surface, 11... Other end surface,
13...terminal pin, 13a...pin part, 13b...
...Contact part.

Claims (1)

[Claims for Utility Model Registration] A coil body in which a plurality of coils are arranged in a ring around a connecting part located at the center, and a power supply contact to each of the coils is formed on one surface of the connecting part, and a cylinder. A plurality of terminal pins are held by a shaped holder, and the terminal pin has a contact part and a pin part connected in an L-shape, and the pin part passes through the holder in the axial direction, and its tip end is and a connector unit protruding from one end surface forming a plane of the holder, the contact portion being positioned so as to extend along the other end surface of the holder in a tangential direction of a circle centered on the axis of the holder. A coil unit characterized in that the coil body and the connector unit are fixed in a state in which a contact portion of a terminal pin of the connector unit is in contact with a power supply contact of the coil body.