TWI591667B - Flexible circuit board - Google Patents

Description

Flexible circuit board

The present invention relates to an electromagnet and to a flexible circuit board that can be applied to an electromagnet.

A commonly used electromagnet is wound around a core with a wire so that the wire is wound to form a coil. However, the commonly used electromagnet construction uses a metal wire to wrap the core, so that the volume of the common electromagnet is limited by the metal wire, and cannot be further reduced, and the production of the commonly used electromagnet also reduces the productivity due to the use of the metal wire. .

Accordingly, the inventors believe that the above-mentioned defects can be improved, and that the present invention has been put forward with great interest in designing and cooperating with the theory, and finally proposes a design which is reasonable in design and effective in improving the above defects.

The embodiment of the invention provides a flexible circuit board, which can effectively solve the problems existing in the common electromagnet.

The embodiment of the invention discloses a flexible circuit board, comprising: a substrate and a plurality of surrounding lines disposed on the substrate separately from each other, the opposite ends of the substrate are connected to form a tubular structure, and the plurality of said surrounding The lines are connected end to end to form at least one coil; wherein each of the surrounding lines includes two metal layers and at least one connecting portion connecting the two metal layers; two of each of the surrounding lines The metal layers are respectively formed on opposite plate faces of the substrate, and the at least one connecting portion of each of the surrounding wires is buried in the substrate.

In summary, the flexible circuit board disclosed in the embodiment of the present invention can pass the The coil formed by the line unit replaces the coil wound by the conventional metal wire, thereby facilitating the manufacture and miniaturization of the electromagnet.

For a better understanding of the features and technical aspects of the present invention, reference should be made to the accompanying drawings limits.

100‧‧‧electromagnet

1‧‧‧Soft circuit board

11‧‧‧Substrate (tubular structure)

111‧‧‧ surrounding area (tubular structure)

1111‧‧‧ first end

1112‧‧‧ second end

112‧‧‧Connected area

12‧‧‧Line unit

121‧‧‧ Around the line

1211‧‧‧ metal layer

1212‧‧‧Connecting Department

1213‧‧‧First pad

1214‧‧‧Second pad

122‧‧‧Connected lines

1221‧‧‧metal layer

1222‧‧‧Connecting Department

1223‧‧‧Connecting pads

13‧‧‧ bonding layer

2‧‧‧ core

L‧‧‧ Length direction

1 is a schematic top plan view of a first embodiment of an electromagnet according to the present invention.

2 is a side elevational view of the first embodiment of the electromagnet of the present invention.

3 is a schematic view showing the state in which the flexible circuit board of the first embodiment of the electromagnet of the present invention is in a planar state.

Figure 4 is a cross-sectional view taken along line IV-IV of Figure 3;

Figure 5 is a cross-sectional view of Figure 3 taken along line V-V.

Figure 6 is another cross-sectional view of Figure 3 taken along line V-V.

Figure 7 is a further perspective view of Figure 3 taken along line V-V.

FIG. 8 is a perspective view of a second embodiment of an electromagnet according to the present invention.

Fig. 9 is a schematic view showing the state in which the flexible circuit board of the second embodiment of the electromagnet of the present invention is in a planar state.

10 is a perspective view showing the flexible circuit board of FIG. 9 mounted on a core.

[Example 1]

Referring to FIG. 1 to FIG. 7 , which is a first embodiment of the present invention, it should be noted that the related numbers and appearances mentioned in the embodiments are only used to specifically describe the embodiments of the present invention. The scope of the present invention is not to be construed as limiting the scope of the present invention.

As shown in FIG. 1 and FIG. 2, the embodiment discloses an electromagnet 100 including a flexible circuit board 1 and a core 2, the flexible circuit board 1 is sleeved on the core 2, and the flexible circuit board 1 can A current is received to cause the core 2 to be magnetic. That is to say, in the present embodiment, the coil formed by the metal circuit is replaced by the flexible circuit board 1 to facilitate the manufacture and miniaturization of the electromagnet 100. To facilitate understanding of this reality The electromagnet 100 of the embodiment will be described below with a possible implementation of the flexible circuit board 1 in a planar state, but is not limited thereto.

As shown in FIG. 3, the flexible circuit board 1 includes a substrate 11 and a line unit 12 formed on the substrate 11. The material used in the embodiment of the substrate 11 is Polyimide (PI), and the substrate 11 has a plurality of surrounding regions 111 and is located between any two adjacent surrounding regions 111. A connection area 112. A plurality of the surrounding areas 111 are each elongated and parallel to each other, and corresponding portions of any two adjacent surrounding areas 111 are connected by one of the connecting areas 112. That is, any one of the connection regions 112 and the two surrounding regions 111 connected thereto form an H-shape.

The line unit 12 is made of copper in the embodiment, and the line unit 12 includes a plurality of surrounding lines 121 and a plurality of connecting lines 122 which are disposed apart from each other, that is, a plurality of the surrounding lines 121 and Any two of the plurality of connecting lines 122 do not contact each other. A plurality of the surrounding lines 121 are respectively formed on the plurality of surrounding areas 111, and each of the connecting areas 112 and two adjacent surrounding areas 111 are provided with one connecting line 122. It should be noted that the number of the surrounding lines 121 on each of the surrounding areas 111 is plural in the embodiment, but only a single of the surrounding lines 121 may be formed on each of the surrounding areas 111.

As shown in FIGS. 3 and 4, each of the surrounding lines 121 includes two metal layers 1211 and at least one connecting portion 1212 connecting the two metal layers 1211. Two of the metal layers 1211 surrounding the line 121 are respectively formed on opposite two plates of the substrate 11 (such as the top and bottom surfaces of the substrate 11 in FIG. 4), and each of the surrounding lines The connecting portion 1212 of 121 is buried in the substrate 11. Moreover, each of the two metal layers 1211 surrounding the line 121 can be vertically aligned (not shown) or misaligned, and is not limited herein. Thereby, the surrounding circuit 121 is transparent The two metal layers 1211 are respectively formed on opposite plate faces of the substrate 11 so that the processing difficulty around the line 121 can be effectively reduced, for example, the etching depth around the line 121 is lowered, and the surrounding line 121 is formed. It's easier.

Further, as shown in FIG. 5, any configuration may be formed on each of the two metal layers 1211 surrounding the wiring 121, thereby reducing the total thickness of the flexible circuit board 1. Therefore, the flexible circuit board 1 has a thickness of from 100 micrometers (μm) to 150 micrometers, and the flexible circuit board 1 of FIG. 5 has a thickness of 125 micrometers. Furthermore, as shown in FIG. 6, the flexible circuit board 1 may further include a bonding layer 13 disposed on one of the board faces of the substrate 11 and covering each corresponding one of the surrounding lines 121. The metal layer 1211 has a thickness of the above-mentioned flexible circuit board 1 of from 125 μm to 175 μm, and the flexible circuit board 1 of FIG. 6 has a thickness of 150 μm. Alternatively, as shown in FIG. 7, the flexible circuit board 1 may further include two bonding layers 13, which are respectively disposed on opposite plate faces of the substrate 11 and respectively cover a plurality of layers The metal layer 1211, and the flexible circuit board 1 has a thickness of 150 micrometers to 200 micrometers, and the flexible circuit board 1 of FIG. 7 has a thickness of 175 micrometers.

In addition, each of the connection lines 122 is configured as described above around the line 121, that is, each of the connection lines 122 also includes at least two of the opposite sides of the substrate 11 respectively. The metal layer 1221 and a connecting portion 1222 embedded in the substrate 11 and connected to the two metal layers 1221. Therefore, the configuration of the connection line 122 is not repeatedly described in this embodiment.

Referring to FIG. 3, each of the surrounding areas 111 has a first portion at opposite ends (such as the top end portion and the bottom end portion of the surrounding portion 111 in FIG. 3). The end portion 1111 and a second end portion 1112, and the first end portions 1111 of the plurality of surrounding regions 111 are linearly arranged, and the second end portions 1112 of the plurality of surrounding regions 111 are also linearly arranged. .

On each of the surrounding areas 111, each of the surrounding lines 121 is from the first One end portion 1111 extends to the second end portion 1112. A first pad 1213 and a second pad 1214 are respectively formed on opposite ends of each of the surrounding lines 121, and each of the first pad 1213 and the second pad 1214 surrounding the line 121 are respectively Located at the first end portion 1111 and the second end portion 1112. That is, a plurality of the first pads 1213 surrounding the line 121 are arranged in a row at the first end portion 1111, and a plurality of the second pads 1214 surrounding the line 121 are at the second end portion. 1112 is arranged in another column. In more detail, each of the surrounding lines 121 defines a virtual straight line (not shown) connecting the first pad 1213 and the second pad 1214, and the virtual straight line and the surrounding area A lengthwise L-phase clip of 111 forms an acute angle (not shown). That is to say, the first pad 1213 and the second pad 1214 surrounding any of the lines 121 are not simultaneously positioned in the length direction L.

Each of the connecting lines 122 extends from the first end 1111 of the surrounding area 111 of the two surrounding surrounding areas 111 through the connecting area 112 to the second end of the other surrounding area 111. Part 1112 (Figure 3). Furthermore, a connection pad 1223 is formed at each end of each connection line 122, and any of the connection pads 1223 is associated with one of the first pads 1213 (or one of the second pads 1214). Located in the length direction L. In addition, the connection line 122 of the present embodiment is not limited to the above type. In an unillustrated embodiment, each connection line 122 is surrounded by one of the two surrounding areas 111 provided. The first end portion 1111 extends through the connecting portion 112 to the first end portion 1111 of the other surrounding portion 111.

Further, referring to FIG. 1 to FIG. 3, opposite ends of each of the surrounding regions 111 can be joined to form a tubular structure 111 (ie, each of the surrounding regions 111 can be bent to make the first The end portion 1111 and the second end portion 1112 are stacked on each other, and the opposite ends of each of the connecting lines 122 are respectively connected to the two adjacent lines 121 which are not adjacent to the same tubular structure 111, so as to The plurality of surrounding lines 121 and the plurality of connecting lines 122 of the line unit 12 constitute at least one coil.

The above is a possible implementation configuration of the flexible circuit board 1 in the planar state of the present embodiment. The following describes the relationship between the flexible circuit board 1 and the core 2, and the technical features disclosed in the above description of the flexible circuit board 1 are It will not be repeated in the following description.

The core 2 is in a ring shape, and the core 2 of the present embodiment is described in a square ring shape, but is not limited thereto. For example, the core 2 may also be annular, triangular, elongated, or irregular. The core 2 is composed of an iron core and an insulating layer covering the outer surface of the iron core in the embodiment, and the core 2 has a thickness of approximately 400 μm.

The opposite ends of each of the surrounding regions 111 of the substrate 11 are joined to form a tubular structure 111, and opposite ends of each of the connecting lines 122 are respectively connected to two adjacent but not identical tubular structures 111. The above-mentioned surrounding circuit 121 is such that a plurality of surrounding lines 121 and a plurality of connecting lines 122 of the line unit 12 constitute at least one coil. Furthermore, each of the tubular structures 111 is wound around the core 2, and the core 2 of the embodiment is wound around the four sides of the tubular structure 111 so that the coils are wound around the core 2. . One end of the coil formed by the flexible circuit board 1 can be used to input current, and the other end can be used to output current to make the core 2 magnetic. Thereby, the electromagnet 100 replaces the coil wound by the conventional metal wire by the flexible circuit board 1 to facilitate the manufacture and miniaturization of the electromagnet 100.

Specifically, the first end portion 1111 and the second end portion 1112 of each of the tubular structures 111 are stacked on each other, and the pads on the first end portion 1111 are respectively connected (eg, soldered) in position. The pad of the second end portion 1112. Wherein, the plurality of surrounding lines 121 of each of the tubular structures 111 are connected end to end in sequence, that is, the first of the two adjacent surrounding lines 121 is the first around the line 121. The pad 1213 is connected and fixed to the other of the second pads 1214 surrounding the line 121. And any of the connection pads 1223 of the connection line 122 is in contact with the first pad 1213 (or the second pad 1214) located in the same length direction L.

Furthermore, a plurality of the connection regions 112 of the embodiment are disposed on the inner side of the core 2 Further, the inner side wall of the core body 2 faces the inner space of the core body 2, thereby contributing to reducing the volume of the electromagnet 100. Each of the tubular structures 111 preferably has an inner surface abutting against the surface of the core 2, thereby reducing the overall thickness of the electromagnet 100.

[Embodiment 2]

Referring to FIG. 8 to FIG. 10, which is a second embodiment of the present invention, the present embodiment is similar to the above-mentioned first embodiment, and the same portions are not described again, and the main differences between the two embodiments are as follows.

The electromagnet 100 disclosed in this embodiment includes a flexible circuit board 1 and a core body 2. The flexible circuit board 1 includes a substrate 11 and a plurality of surrounding lines 121 disposed apart from each other on the substrate 11. Wherein, the substrate 11 is substantially rectangular, and opposite ends of the substrate 11 (such as opposite short side ends of the substrate 11 in FIG. 9) are joined to form a tubular structure 11, and a plurality of the surrounding lines 121 are formed. At least one coil is formed by sequentially connecting the head and the tail. Furthermore, the core 2 is long and consists of an iron core and an insulating layer covering the outer surface of the core, the core 2 is inserted into the tubular structure 11, and the flexible circuit board One end of the formed coil can be used to input current, and the other end can be used to output current to make the core 2 magnetic.

Specifically, the substrate 11 has a first end portion 1111 and a second end portion 1112 at opposite ends (such as the opposite two short side ends of the substrate 11 in FIG. 9), each of which surrounds the line 121 extends from the first end portion 1111 to the second end portion 1112, and the first end portion 1111 and the second end portion 1112 of the tubular structure 11 are stacked one on another. Further, a first pad 1213 and a second pad 1214 are formed on opposite ends of each of the surrounding lines 121, and the first pad 1213 and the second pad 1214 surrounding the line 121 are respectively formed. Located at the first end portion 1111 and the second end portion 1112, respectively, and any one of the two adjacent surrounding wires 121 is connected to the first pad 1213 of the line 121 and is fixed to the second wire of the other of the wires 121. Pad 1214.

Furthermore, each of the surrounding lines 121 includes two metal layers 1211 and at least one connecting portion 1212 connecting the two metal layers 1211 (as in FIG. 4 of the first embodiment), each of which surrounds the line 121. Two metal layers 1211 are respectively formed on opposite plate faces of the substrate 11, and each of the connecting portions 1212 surrounding the wires 121 is buried in the substrate 11. Preferably, no configuration is formed on each of the two metal layers 1211 surrounding the line 121, and the flexible circuit board 1 has a thickness of between 100 micrometers and 150 micrometers.

[Technical Effects of Embodiments of the Invention]

In summary, the electromagnet and the flexible circuit board disclosed in the embodiments of the present invention can replace the coil formed by the conventional metal wire by the coil formed by the circuit unit of the flexible circuit board, thereby facilitating the electromagnet. Manufacturing and miniaturization. Furthermore, the surrounding line is formed by forming two metal layers on opposite plates of the substrate, so that the processing difficulty around the line can be effectively reduced, for example, the etching depth of the surrounding line is reduced, so that the surrounding line is made. Forming is easier.

The above are only the preferred embodiments of the present invention, and are not intended to limit the scope of the present invention. All changes and modifications made by the scope of the present invention should be construed as the scope of the present invention.

100‧‧‧electromagnet

1‧‧‧Soft circuit board

11‧‧‧Substrate (tubular structure)

12‧‧‧Line unit

2‧‧‧ core

Claims (4)

A flexible circuit board comprising: a substrate and a plurality of surrounding lines disposed on the substrate separately from each other, the opposite ends of the substrate are joined to form a tubular structure, and the plurality of surrounding lines are sequentially arranged Forming at least one coil; wherein each of the surrounding lines includes two metal layers and at least one connecting portion connecting the two metal layers; each of the two metal layers surrounding the circuit respectively Formed on opposite plate faces of the substrate, and the at least one connection portion of each of the surrounding wires is buried in the substrate. The flexible circuit board of claim 1, wherein the substrate has a first end and a second end at opposite ends, each of the surrounding lines extending from the first end to the a second end, and the first end and the second end of the tubular structure are stacked one on another. The flexible circuit board of claim 2, wherein each of the opposite ends of each of the surrounding lines is formed with a first pad and a second pad, and each of the first pads surrounding the line And the second pad is respectively located at the first end and the second end, and any one of the two adjacent ones of the surrounding lines is connected to the first pad surrounding the line The second pad is fixed to the other of the surrounding wires. The flexible circuit board of claim 1, wherein no configuration is formed on each of the two metal layers surrounding the wiring, and the flexible circuit board has a thickness of between 100 micrometers and 150 micrometers.