JP2002057415A - Circuit board for mounting air core coil - Google Patents

Abstract

PROBLEM TO BE SOLVED: To overcome the problem that conventionally that soldering the insula tion coated lead wire of the winding of an air core coil directly to a circuit board through a hole thereof that the work for passing the lead wire through a hole, is very inefficient and has risk of disconnection and that reliability of solder connection is low. SOLUTION: Reliability of soldering can be enhanced by binding the lead wires of an air core coil fixedly at a tongue-like stop side and providing the land face of a circuit board, along the temporarily stopped lead wire thereby positioning the lead wire and enlarging the soldering area thereof. Since cut grooves for passing the lead wires of the air core coil are made at two positions in the circuit board, insulation is ensured at the start-of-winding and the end-of- winding, routing work of the lead wire is facilitated, and the work efficiency can be enhanced.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a connection between an air core coil used in various electronic devices and a circuit board.

[0002]

2. Description of the Related Art In recent years, electronic devices, especially portable electronic devices, have become mainstream not only in size but also in thickness and weight, and the electronic components used in these devices have become thinner, smaller and lighter. Is being demanded. In particular, portable electronic devices such as video cameras, cordless telephones, portable telephones, and personal computers, and non-contact chargers and the like used in portable electronic devices have been increasingly regarded as being thin, small, and lightweight. .

[0003] Among them, the air-core coil has been widely used especially among electronic parts used for a non-contact charger.

[0004] A non-contact charger used in this portable electronic device will be described with reference to a schematic sectional view of FIG. The contactless charger includes a charging unit A and a charged unit B. The charging section A of the portable electronic device includes an input cord (not shown) connected to an AC power supply, includes a holding section 15 for holding the outer case 10 of the charged section on the surface of the outer case 4, The circuit board 3 has a primary coil 1 as an air core coil and other electronic components 2 constituting a circuit, and the primary coil 1 is arranged close to the surface of the holding portion 15. The part to be charged B is the outer case 1
0, and a secondary coil 11 of an air-core coil, which is supplied with charging power by electromagnetic induction from the primary coil 1 in the vicinity of the holding portion 15 of the outer case of the charging section, is provided for non-contact charging. It is configured to be able to. Reference numeral 12 denotes a circuit board on the side to be charged, on which the secondary coil 11 is provided.

[0005] As described above, air-core coils from which a ferrite core or the like is removed are incorporated and used as primary and secondary coils in a non-contact charging device of a portable electronic device as a primary coil and a secondary coil. Is coming. FIG. 5 shows the circuit board 3 of the charging section A to which the air-core coil is attached. A circuit pattern is printed on the bottom surface 3b. On the upper surface 3a, the air core coil 1 and other electronic components 2 constituting a circuit are mounted, and the lead wires 1a, 1b at the start and end of winding of the air core coil 1 are mounted.
Are fixed through predetermined holes 8a and 8b of the circuit board, and are electrically connected to the respective lands 9a and 9b of the circuit pattern by soldering directly on the bottom side.

[0006]

However, these air-core coils are wound with thin wires that have been subjected to insulation coating treatment, and it is difficult to remove the insulation coating from the lead wires drawn out from both ends of the winding. For this reason, it is connected to the circuit by soldering directly to the land of the circuit board without peeling. In this way, passing the winding lead wire that has been subjected to the insulation coating through the hole in the circuit board and soldering it directly to the circuit board requires a lot of work efficiency such as extremely low work efficiency and a high risk of disconnection. There was a problem that connection reliability was weak. The present invention aims to solve these problems.

[0007]

According to the present invention, there is provided a circuit board for mounting an air-core coil, comprising: a tongue for locking a lead wire having an extended winding of the air-core coil. Or a projecting locking piece provided on one edge of the circuit board, and the land surface of the circuit board for connecting the lead wire of the air-core coil is drawn from the lead-out portion of the lead wire of the air-core coil. The lead wire is extended in the direction of the locking piece for locking the lead wire.

Further, in the circuit board for mounting the air-core coil of the present invention, two grooves for passing lead wires of the air-core coil are provided on one edge of the circuit board, and one groove is formed from one edge of the circuit board. The groove is cut to the position of the inner periphery of the air-core coil, and the other groove is cut to the position of the outer periphery of the air-core coil from one edge of the circuit board.

[0009]

DETAILED DESCRIPTION OF THE INVENTION A circuit board for mounting an air-core coil according to the present invention is a tongue-shaped locking piece or one edge of the circuit board for locking a lead wire having an extended winding of an air-core coil. The land of the circuit board that connects the lead wire of the air-core coil has a projection-shaped locking piece provided in the portion, and the land of the circuit board that connects the lead wire of the air-core coil extends in the direction of the locking piece that locks the lead wire. By providing them along, the positioning of the lead wire can be performed, and the soldering area of the lead wire can be increased to increase the reliability of soldering.

[0010] Further, two grooves for passing the lead wire of the air-core coil are provided in one edge of the circuit board, and one groove is cut from the one edge of the circuit board to the position of the inner periphery of the air-core coil. The other groove is cut from one edge of the circuit board to the position of the outer periphery of the air-core coil, so that insulation at the start and end of winding is ensured, and the lead wire drawing operation is facilitated, and the working efficiency can be improved.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an embodiment of a circuit board for mounting an air-core coil according to the present invention will be described with reference to FIGS. 1 to 3 show conventional examples shown in FIGS.
The same symbols are used for the same items.

In FIG. 1 and FIG. 2, another electronic component 2 constituting a circuit excluding an air core coil is already mounted on a circuit board 3. Temporarily fix the lead wire of the air core coil 1,
The tongue-shaped locking piece 4 for locking to facilitate the work of soldering the lead wire is formed by providing a notch at one edge of the circuit board. FIG. 3 shows, as another embodiment, a locking piece 7 provided with a rectangular projection whose base is narrowed at one edge of a circuit board. The shape of the locking piece is not limited to this embodiment, but may be a trapezoidal shape, an inverted triangular shape, a circular shape, a shape in which a tip is split and sandwiched, or the like.

The circuit board 3 is also provided with respective notches 5a and 5b through which lead wires at the start and end of winding of the air core coil 1 can be easily passed. The notch groove 5a is cut from one edge of the circuit board to the position of the inner periphery of the air core coil 1 since the lead wire 1a at the beginning of winding of the air core coil 1 is drawn out from the inner periphery. . The notch groove 5b is cut from one edge of the circuit board to a position on the outer peripheral portion of the air core coil 1 since the winding end lead wire 1b of the air core coil 1 is drawn out from the outer peripheral portion. This is because power is supplied from an AC power source, and a high voltage is applied between the start and end of winding of the air-core coil 1, so that the respective lead wires do not cross each other to secure insulation. .

The lands 6a and 6b for connecting the lead wires at the start and end of the winding of the air-core coil 1 to the circuit board are locking pieces for locking the lead wires from the lead-out portion of the lead wire of the air-core coil. It is formed in a rectangle that can be extended in the direction of 4. Thereby, the soldering surface between the lead wire of the air-core coil and the land can be widened, and the reliability of soldering can be increased. Note that the shape of the land surface is not rectangular, but is preferably an oval, elliptical, or elliptical shape that allows a wide solder surface of the lead wire.

The work of mounting the air-core coil is as follows. First, the winding start lead wire 1a and the winding end lead wire 1b of the air-core coil 1 are passed through the respective notched grooves 5a, 5b, and then are fixed with an adhesive or the like. To the position. Then, the winding start lead wire 1a and the winding end lead wire 1b of the air-core coil 1 are wound or wound on the tongue-shaped locking piece 4, respectively. Then, the winding start lead wire 1a and the winding end lead wire 1b of the air-core coil 1 in contact with the respective lands 6a and 6b are soldered and connected to the circuit board. Then, the winding start lead wire 1a and the winding end lead wire 1b of the air core coil 1 wound on the locking piece 4 are removed from the locking piece 4, and the respective lands 6a, 6b
The work of mounting the air-core coil is completed by cutting and removing with a solder part.

[0016]

As described above, the air-core coil mounting circuit board of the present invention has a land surface for connecting the lead wire along the lead wire of the air-core coil fixed to the tongue-shaped locking piece. By widening, the positioning of the lead wire is facilitated, and the reliability of the soldering can be improved. By providing two cutout grooves on the circuit board for passing the lead wire of the air-core coil, insulation at the start and end of the winding is ensured, and the work of leading the lead wire is facilitated. An air-core coil mounting circuit board with improved efficiency can be provided.

[Brief description of the drawings]

FIG. 1 is an embodiment of a circuit board for mounting an air-core coil according to the present invention.

FIG. 2 is a working example of a circuit board for mounting an air-core coil according to the present invention.

FIG. 3 is another embodiment of a circuit board for mounting an air-core coil according to the present invention.

FIG. 4 is a sectional view of a contactless charger.

FIG. 5 shows an example of a conventional circuit board for mounting an air-core coil.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Air-core coil 1a, 1b Air-core coil lead wire 2 Electronic component which forms a circuit 3 Circuit board 4 Locking piece 5a, 5b Groove 6a, 6b Land

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 5E070 AA01 AB01 AB10 BA01 CA06 DB03 EA07 5E336 AA01 AA04 BB01 BC04 BC25 BC36 CC51 CC59 EE01 EE11 EE17 GG05 5E338 AA01 BB61 BB65 CC01 CD11 CD32 DD01 EE32 EE43 EE51

Claims (3)

[Claims] An air-core coil mounting circuit board has a tongue-shaped locking piece for locking an extended lead wire of an air-core coil. A circuit board for mounting an air-core coil, wherein a land surface of the circuit board to be connected is provided along a direction of a locking piece for locking a lead wire from a lead-out portion of a lead wire of the air-core coil. 2. A circuit board for mounting an air-core coil, the circuit board having, on one edge of the circuit board, a projection-shaped locking piece for locking a lead wire having an extended winding of the air-core coil. The land surface of the circuit board for connecting the lead wire of the core coil is provided along the direction of the locking piece for locking the lead wire from the lead-out portion of the lead wire of the air core coil, for mounting the air core coil Circuit board. 3. An air core coil has two grooves formed in a part of an end surface of the circuit board for passing lead wires of the air core coil, and one of the grooves extends from one edge of the circuit board to an inner peripheral portion of the air core coil. 3. The air-core coil mounting according to claim 1, wherein the other groove is cut from one edge of the circuit board to a position of an outer peripheral portion of the air-core coil. Circuit board.