JPH11219834A - Coil and clock - Google Patents

Abstract

PROBLEM TO BE SOLVED: To realize a coil which is easily built in an equipment without wasting a space in the equipment so as to lessen the equipment in size by a method wherein a spiral wiring pattern is formed on an electric circuit board, and the wiring patterns adjacent to each other in the thicknesswise direction of the electric circuit board are electrically connected together. SOLUTION: Wiring patterns 5 to 8 are each formed on the upper and lower sides of printed wiring boards 3 and 4, and the wiring patterns 5 to 8 are each formed like a spiral. The wiring patterns 5 and 6 formed on the upside and underside of the printted wiring board 3 are electrically connected together with a through-hole 9. The wiring pattern 6 formed on the underside of the printed wiring board 3 is connected to the wiring pattern 7 formed on the upside of the wiring board 4 through through-holes 10 and 11. A conductive plating layer 15 is connected to the wiring pattern 6 of the wiring board 3 with a connection pattern 16, and the conductive plating layer 15 is connected to the wiring pattern 7 of the printed wiring board 4 with a connection pattern 17. The wiring patterns 7 and 8 provided to the upside and underside of the printed wiring board 4 are connected together through a through-hole 12.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a coil used for electromagnetic induction and other uses, and a timepiece using the coil.

[0002]

2. Description of the Related Art FIG. 9 shows a cordless telephone to which electric power is supplied by electromagnetic induction. Such a power supply form by electromagnetic induction is used for various electronic devices such as an electric toothbrush and an electric shaver.

[0003] In the structure shown in FIG.
Is set in charger 110, cordless telephone 100 is charged. A primary coil 120 connected to a power source is provided inside the charger 100, and a secondary coil 130 corresponding to the primary coil 120 is provided inside the cordless telephone 100. When power is supplied to the primary coil 120, an electromotive force is generated in the secondary coil 130 by an electromagnetic induction action, and this power is charged in a secondary battery (not shown) inside the cordless telephone 100.

[0004] The coils 120 and 130 are formed in a donut shape by spirally winding a conductive wire made of copper or the like having a wire diameter of about 0.1 to 0.2 mm. is there. And each coil 12
The circuit is connected to the circuit by soldering a lead wire (not shown) at the tip of 0, 130 to the circuit board.

[0005]

However, in the above-described conventional structure, it is necessary to incorporate a coil into the case of each device such as a cordless telephone or a charger separately from the circuit board. The assembly process is increasing. And in addition to these built-ins,
The work of connecting the coil and the circuit board is required, and the assembly is troublesome.

In addition, it is necessary not only to form protrusions, hooks, and other structures for installing the coil on the case but also to provide a space for accommodating the coil. For this reason, a considerable portion of the case of the device is consumed for housing the coil, and there is a problem that the space in the case cannot be effectively used and the case cannot be miniaturized.

The present invention has been made in view of such conventional problems, and can be easily incorporated into a device, and can be downsized without consuming the space of the device. It is an object of the present invention to provide a coil capable of performing the following. Another object of the present invention is to provide a timepiece using such a coil.

[0008]

According to a first aspect of the present invention, there is provided a coil according to the first aspect of the present invention, wherein a spiral wiring pattern formed on an electric circuit board is adjacent to the coil in a thickness direction of the electric circuit board. Means for electrically connecting the wiring pattern.

In the present invention, the spiral wiring pattern formed on the electric circuit board constitutes one element of the coil, and the whole coil is constituted by connecting a plurality of these elements by the connection means. Such a coil is formed on the substrate at the same time as the formation of the land pattern for mounting the circuit pattern and other electronic components, so that the step of connecting to the electric circuit substrate is not required.

In addition, since the coil formed integrally with the electric circuit board is automatically incorporated into the device by incorporating the electric circuit substrate into the device, a step for incorporating the coil is not required. . In addition, the coil can be incorporated into the device only by the space for incorporating the electric circuit board, and a dedicated space for incorporating the coil is not required, so that the device can be downsized.

According to a second aspect of the present invention, there is provided the coil according to the first aspect, wherein the electric circuit board is composed of multiple layers, and the wiring pattern is formed on each electric circuit board.

According to the present invention, the required number of turns of the coil can be ensured by forming the wiring pattern on the multilayer electric circuit board.
Since it can be accommodated in the installation space of the multilayer electric circuit board, the device does not become large.

According to a third aspect of the present invention, there is provided the coil according to the first aspect, wherein the electric circuit board is composed of multiple layers, and the wiring pattern is formed on an inner layer portion of the electric circuit board.

In the present invention, since the wiring pattern is formed on the inner layer portion of the multilayer electric circuit board, the design for mounting the electronic parts is changed without affecting the mounting of the electronic parts on the electric circuit board. Eliminates the need.

According to a fourth aspect of the present invention, there is provided the coil according to any one of the first to third aspects, wherein a hollow is formed in the electric circuit board in a thickness direction, and the wiring pattern is formed of the hollow. It is characterized by being formed in a donut shape on the periphery.

According to the present invention, the electronic component can be arranged in the hollow formed in the electric circuit board. Therefore, the electronic components can be efficiently arranged in the small space.

A timepiece according to a fifth aspect of the present invention is characterized in that the coil according to the fourth aspect is disposed between the module and the back cover, and the wiring pattern is connected to the module by a connecting member. I do.

According to the present invention, by connecting the coil to the module, signals can be input and output between the coil and the module. The wiring pattern that constitutes the coil is placed around the hollow hole in the electric circuit board, and by arranging the electronic components in the hollow hole, the electronic components can be efficiently placed in the small space of the watch. It can be carried out.

According to a sixth aspect of the present invention, the coil according to the fourth aspect and the dial are integrally formed, and the wiring pattern is connected to the module by a connecting member.

According to the present invention, since the coil is formed integrally with the dial, manufacturing for individually forming the coil and the dial is simplified. Further, since the coil and the dial are integrated and can be arranged integrally in the watch case, the incorporation into the watch case is simplified. further,
In the state of being installed in the watch case, the wiring pattern is provided around the hollow, and the display member such as the liquid crystal display panel of the module can be read through the hollow.

According to a seventh aspect of the present invention, the watch case for housing the display member and the module is formed of plastic, and the watch case and the coil according to the fourth aspect are integrally formed, and the wiring pattern is formed by a connecting member. It is characterized by being connected to the module.

According to the present invention, the watch case and the coil made of plastic are integrally formed, and the coil can be incorporated into the watch case simultaneously with the formation of the watch case. For this reason, the incorporation of the coil into the watch case can be simplified.

[0023]

1 and 2 show a coil 1 according to a first embodiment of the present invention, and 2 is an electric circuit board.
The electric circuit board 2 is configured by a four-layered multilayer board in which two printed wiring boards 3 and 4 are stacked. Wiring patterns 5, 6, 7, 8 are formed on the upper and lower surfaces of these printed wiring boards 3, 4, respectively. 5 is a wiring pattern formed on the upper surface 3a of the upper printed wiring board 3, 6 is a wiring pattern formed on the lower surface 3b of the upper printed wiring board 3, and 7 is a wiring pattern formed on the upper surface 4a of the lower printed wiring board 4. The formed wiring pattern 8 is a wiring pattern formed on the lower surface 4b of the lower printed wiring board 4.

These wiring patterns 5, 6, 7, 8 are
Each is formed so as to have a spiral shape. In the illustrated example, none of the wiring patterns 5, 6, 7, and 8 is formed in a donut shape in a peripheral portion excluding the central portion without being formed in the central portion. In this case, the pitch between the inner spiral line and the outer spiral line is about 0.2 mm. With such a spiral shape, each of the wiring patterns 5, 6, 7, and 8 constitutes one element of the coil.

The spiral wiring patterns 5, 6, 7, 8 formed on the printed wiring boards 3, 4 are through holes 9, 1, which penetrate the printed wiring boards 3, 4 in the thickness direction.
0, 11, and 12 electrically connect sequentially.

That is, in FIG. 2, the wiring patterns 5 and 6 formed on the upper and lower surfaces of the upper printed wiring board 3 are:
They are connected by a through hole 9 on the right side penetrating the upper printed wiring board 3 in the thickness direction, whereby a current flows from the wiring pattern 4 to the wiring pattern 5 as shown by an arrow B in FIG. To make this connection, conductive plating 13 is applied inside the through hole 9, and a connection pattern 14 is formed between the conductive plating 13 and each of the wiring patterns 5 and 6 on both surfaces of the substrate 3. I have.

Next, the wiring pattern 6 on the lower surface of the upper printed wiring board 3 and the wiring pattern 7 on the upper surface of the lower printed wiring board 4 are formed through the through holes 10 and 11 formed on the left side of the printed wiring boards 3 and 4. The current flows in the direction indicated by the arrow C between them. In this case, the through holes 10 and 11 are formed at communication positions penetrating coaxially, and conductive plating 15 is formed in the inside thereof in a bridging manner. The conductive plating 15 and the wiring pattern 6 of the upper printed wiring board 3 are connected by a connection pattern 16, while the conductive plating 15 is connected to the wiring pattern 7 of the lower printed wiring board 4 by a connection pattern 17. I have.

The wiring patterns 7 and 8 on the upper and lower surfaces of the lower printed wiring board 4 are connected through through holes 12 penetrating to the right side of the printed wiring board 4. To make this connection, conductive plating 18 is applied inside the through-hole 12, and connection patterns 19 on both surfaces of the substrate 4 are connected to the conductive plating 18. With this connection, a current flows as indicated by an arrow D.

By the above connection, the spiral wiring patterns 5, 6, 7, 8 formed on the four layers of the printed wiring boards 3, 4 are electrically connected through the through holes 9, 10, 11, 12. Are connected, and the coil 1 is configured by this connection. Thereby, the coil 1 is formed on the electric circuit board 2 in a state of being integrated with the electric circuit board 2. In a state where the coil 1 and the electric circuit board 2 are integrated as described above, the coil 1 can be simultaneously incorporated by incorporating the electric circuit board 2 into the device, and it is not necessary to separately incorporate the coil 1, and the device is assembled. Can be simplified. In addition, a dedicated space for installing the coil is not required, and the size of the device can be reduced. Furthermore, since there are no independent coils, the number of components can be reduced.

In the present embodiment, the formation of each of the wiring patterns 5, 6, 7, and 8 is performed according to the manufacture of a normal printed wiring board. That is, it can be manufactured by punching a through hole in an insulating substrate on which a copper foil is laminated, printing a resist, exposing the resist, and then etching. In such a formation, the coil 1
Is formed on the electric circuit board 2, so that the coil 1 and the electric circuit board 2 can be connected at the same time when the coil 1 is formed. For this reason, a step for connecting the coil 1 and the electric circuit board 2 becomes unnecessary.

In this embodiment, the wiring patterns 5, 6, 7, and 8 are formed on each surface of the multilayer electric circuit board 2, and the wiring patterns 5, 6, 7, and 8 on each surface are formed through holes. The coil 1 is configured by being connected by 9, 10, 11, and 12. For this reason, the required number of turns of the coil can be ensured, and even a coil having a large number of turns can be accommodated in the installation space of the multilayer electric circuit board 2, and the size of the device is not increased.

In FIG. 1, reference numeral 20 denotes an electrode pattern serving as an input / output terminal of the coil 1. Reference numeral 21 denotes a land pattern for mounting electronic components (not shown) such as an LSI chip, a resistor chip, and a capacitor chip, and reference numeral 22 denotes a circuit pattern. In this embodiment, the application to the four-layer electric circuit board 2 has been described. However, the electric circuit board may be a multilayer other than the four layers, or may be a single-layer printed circuit board.

FIG. 3 shows a second embodiment of the present invention.
In this embodiment, a chip-on-board (hereinafter, COB) 23 is used as an electric circuit board. COB23
Is a board on which a bare chip not included in a package is directly mounted on a printed wiring board, and 24 is a chip-like electronic component directly mounted. Reference numeral 55 denotes an electrode portion patterned on the surface of the COB 23. This COB2
3 is also formed by laminating a large number of printed wiring boards.

For such a COB 23, a spiral wiring pattern 25 for forming a coil is formed only on the inner layer side. That is, the wiring pattern 25 is formed only on the opposing surface of the printed wiring board which is laminated and opposing, and is not exposed outside the COB 23. When the wiring pattern 25 is formed only in the inner layer portion as described above, the chip-shaped electronic component 2 provided on the surface of the COB 23
4 does not hinder the mounting of the electronic component 24, and the mounting of the electronic component 24 does not require a design change, so that efficient mounting can be ensured.

FIG. 4 shows a timepiece 26 according to a third embodiment of the present invention, and FIG. 5 shows a coil 27 incorporated in the timepiece 26. The coil 27 is similar to the first embodiment,
It is manufactured by forming a spiral wiring pattern 28 on an electric circuit board. In this case, the electric circuit board may be a multilayer or a single layer.

As shown in FIG. 5, the wiring pattern 28 of the coil 27 in this embodiment is formed in a donut shape around a hollow hole 29 formed in an electric circuit board. In FIG. 5, reference numeral 30 denotes a through hole for connecting the wiring pattern 28 of each layer, and 31 denotes an electrode pattern formed on the upper surface of the electric circuit board while being connected to the through hole 30.

As shown in FIG. 4, the watch 26 includes a watch case 32, a module 33 disposed inside the watch case 32, a watch glass 34 attached to the upper surface of the watch case 32, and a lower surface of the watch case 32. And a back cover 35 attached to the camera. The module 33 is configured by assembling a control circuit board 36 for controlling the operation of the entire timepiece and a display member 37 for displaying time and other information by liquid crystal or the like. A button switch 38 is attached to the side of the watch case 32, and the button switch 38 and the control circuit board 36 are connected by a flexible connection board 39.

The above-described coil 27 is fixed on the back cover 35 by an adhesive 40. Thereby, the coil 2
7 is disposed between the back cover 35 and the module 33. Then, a connection member 42 made of a conductive spring coil is interposed between the electrode pattern 31 and the electrode terminal 41 on the lower surface of the module 33, so that the coil 2
7 and the module 33 are connected, and signals are input / output between them.

Further, on the back cover 35, a piezo element 43 is provided.
Is glued. The piezo element 43 vibrates when a signal is input from the module 33, and the vibration notifies the time by sound. The piezo element 43 is fixed to the back cover 35 so as to be located inside the hollow hole 29 provided in the coil 27.

In such an embodiment, the wiring pattern 2
A hollow hole 29 is formed in the center of the coil 27 where the coil 8 is not formed, and the piezo element 43 is disposed in the hollow hole 29.
7 absorbs. Therefore, the piezo elements 43 can be efficiently arranged, and the timepiece case 32 can be made thin.

FIGS. 6 and 7 show a timepiece 44 according to a fourth embodiment of the present invention, and the same elements as those in FIGS. 4 and 5 are assigned the same reference numerals. In FIG. 6, 45
Is a dial. This dial 45 is, as shown in FIG.
It has a donut shape in which a hollow hole 29 is formed in the center portion, and a spiral wiring pattern 28 is formed in the inside thereof. This spiral wiring pattern 2
8 may be a multilayer or a single layer. Further, an electrode pattern 31 connected to the wiring pattern 28 via the through hole 30 is formed on the lower surface of the dial 45. The wiring pattern 28, the through hole 30, and the electrode pattern 31 form a coil.

By forming the spiral wiring pattern 28 on the dial 45 in this way, the coil and the dial 4
5 and are integrally formed. Therefore, it is not necessary to separately manufacture the coil and the dial, and the number of parts can be reduced. A piezo element 43 is adhered to the upper surface of the back cover 35, and the piezo element 43 and the module 33 are connected by another coil spring 46.

The dial 45 integrated with the coil as described above is arranged inside the watch case 32 so as to be located above the module 33. And the dial 45
By connecting the electrode pattern 31 on the lower surface and the electrode terminal 41 on the upper surface of the control circuit board 36 with a connecting member 42 such as a coil spring, signals are input and output between the coil of the dial 45 and the module 33.

In such an embodiment, the coil can be incorporated simultaneously by incorporating the dial 45 into the watch case 32, so that the assembly can be simplified. A hollow hole 29 is formed in the center of the dial 45, and the module 33 is inserted through the hollow hole 29.
Can be seen, and the display contents displayed by the display member 37 can be reliably read.

FIG. 8 shows a timepiece 50 according to a fifth embodiment of the present invention. In the timepiece 50 of this embodiment, the timepiece case 32 is formed of plastic. Also,
A coil 51 is embedded inside the watch case 32. The coil 51 has a donut shape similar to the structure shown in FIGS. 5 and 7, and has a spiral wiring pattern formed therein. In this case, the electrode pattern 31 is formed on the lower surface of the coil 51, and the electrode pattern 31 and the control circuit board 36 are connected by the connection member 42.

In this embodiment, the coil 51 is inserted into a mold for molding the watch case 32, and the coil 51 is formed by insert molding using the mold.
Can be manufactured.
Since the coil 51 and the watch case 32 are integrated by this molding, there is no need to incorporate the coil 51 into the watch case 32, and the coil 51 can be easily assembled.

[0047]

As described above, according to the first aspect of the present invention, since a land pattern for mounting a circuit pattern and other electronic components is formed on an electric circuit board at the same time, the electric circuit board is formed. It is not necessary to connect to the coil, and the electric circuit board is automatically incorporated into the device by incorporating the electric circuit board into the device. Furthermore, since a dedicated space for installing the coil is not required, the size of the device can be reduced.

According to the second aspect of the invention, the required number of turns of the coil can be ensured, and even if the coil has a large number of turns, the coil can be accommodated in the installation space of the electric circuit board, and the device is large-sized. No more.

According to the third aspect of the present invention, the wiring pattern does not affect the mounting of the electronic component on the electric circuit board, and there is no need to change the design for mounting the electronic component.

According to the fourth aspect of the present invention, since the electronic components can be arranged in the hollow, the electronic components can be efficiently arranged in a small space.

According to the fifth aspect of the present invention, since the wiring pattern forming the coil is arranged around the hollowed hole of the electric circuit board, the electronic component is arranged in the hollowed hole, so that the size of the timepiece can be reduced. The electronic components can be efficiently arranged in the space.

According to the sixth aspect of the present invention, since the coil is formed integrally with the dial, it is not necessary to form the coil and the dial individually, and since these can be integrally disposed in the watch case, Incorporation into the watch case is also simplified.

According to the seventh aspect of the present invention, since the watch case and the coil are formed integrally, the incorporation of the coil into the watch case can be simplified.

[Brief description of the drawings]

FIG. 1 is a perspective view of a coil according to a first embodiment of the present invention.

FIG. 2 is a sectional view taken along line AA in FIG.

3A and 3B show a second embodiment of the present invention, wherein FIG. 3A is a plan view and FIG. 3B is a side view.

FIG. 4 is a sectional view of a timepiece according to a third embodiment of the present invention.

FIG. 5 is a plan view of a coil used in a third embodiment.

FIG. 6 is a sectional view of a timepiece according to a fourth embodiment of the present invention.

FIG. 7 is a plan view of a dial integrated with a coil according to a fourth embodiment.

FIG. 8 is a sectional view of a timepiece according to a fifth embodiment of the present invention.

FIG. 9 is a perspective view of a conventional cordless telephone using a coil.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Coil 2 Electric circuit board 3 4 Printed wiring board 5 6 7 8 Wiring pattern 9 10 11 12 Through hole

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁶ Identification code FI H05K 1/16 H05K 1/16 B

Claims (7)

[Claims] 1. An electric circuit board comprising: a spiral wiring pattern formed on an electric circuit board; and connection means for electrically connecting the wiring patterns adjacent to each other in a thickness direction of the electric circuit board. Coil. 2. The coil according to claim 1, wherein the electric circuit board is composed of multiple layers, and the wiring pattern is formed on each electric circuit board. 3. The coil according to claim 1, wherein the electric circuit board has a multilayer structure, and the wiring pattern is formed on an inner layer of the electric circuit board. 4. The coil according to claim 1, wherein a hollow is formed in the electric circuit board in a thickness direction.
The coil is characterized in that the wiring pattern is formed in a donut shape around a hollow. 5. A timepiece, wherein the coil according to claim 4 is arranged between a module and a back cover, and wherein the wiring pattern is connected to the module by a connecting member. 6. A timepiece, wherein the coil and the dial according to claim 4 are integrally formed, and the wiring pattern is connected to the module by a connecting member. 7. A watch case accommodating the display member and the module is formed of plastic, and the watch case and the coil according to claim 4 are integrally formed, and the wiring pattern is connected to the module by a connection member. A watch characterized by the following.