JP3801850B2 - Circuit board for mounting air-core coil - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to connection between an air-core coil and a circuit board used in various electronic devices.
[0002]
[Prior art]
2. Description of the Related Art In recent electronic devices, particularly portable electronic devices, thinning and weight reduction have become mainstream as well as downsizing, and electronic components used for this have been required to be further thinned, downsized, and reduced in weight. ing. In particular, portable electronic devices such as video cameras, cordless telephones, cellular phones, personal computers, and non-contact chargers used in portable electronic devices have been emphasized as being thin, small, and light. .
[0003]
Among these, air-core coils have been frequently used among electronic components used in non-contact chargers.
[0004]
A non-contact charger used in this portable electronic device will be described with reference to the schematic cross-sectional view of FIG. The non-contact charger includes a charging unit A and a charged unit B. The charging unit A of the portable electronic device includes an input cord (not shown) connected to an AC power source, and includes a holding unit 15 that holds the outer case 10B of the charged portion on the surface of the outer case 10A. The circuit board 3 includes a primary coil 1 that is an air-core coil and another electronic component 2 that constitutes a circuit, and the primary coil 1 is disposed close to the surface of the holding portion 15. The charged part B includes an outer case 10B, and is close to the holding part 15 of the outer case 10A of the charging part, and the secondary side coil of the air-core coil that receives charging power from the primary side coil 1 by electromagnetic induction. 11 is provided so that it can be charged in a non-contact manner. Reference numeral 12 denotes a circuit board on the charged portion side where the secondary coil 11 is provided.
[0005]
As described above, non-contact charging devices for portable electronic devices have been incorporated and used as primary side coils and secondary side coils, in which an air core coil from which a ferrite core or the like is removed has been removed in order to reduce weight and thickness. .
FIG. 5 shows the circuit board 3 of the charging unit A to which an air-core coil is attached. A circuit pattern is printed on the bottom surface side 3b. On the upper surface side 3a, the air core coil 1 and other electronic components 2 constituting a circuit are mounted. Lead wires 1a, 1b at the start and end of winding of the air core coil 1 are placed in predetermined holes 8a, 8b of the circuit board. The bottom surface is electrically connected by soldering directly to the lands 9a and 9b of the circuit pattern.
[0006]
[Problems to be solved by the invention]
However, these air-core coils are wound with a thin wire treated with an insulation coating, and it is difficult to peel the insulation coating from the lead wire drawn from both ends of the winding. It is connected to the circuit by soldering to the land of the board. In this way, passing the insulation coating-treated winding lead wire through the hole in the circuit board and soldering it directly to the circuit board makes the hole-penetrating work extremely inefficient and has a high risk of disconnection. There was also a problem that connection reliability was weak. The present invention aims to solve these problems.
[0007]
[Means for Solving the Problems]
In order to solve the above-mentioned problems, the present invention provides a circuit board for mounting an air-core coil, a tongue-shaped locking piece for locking a lead wire in which a winding of the air-core coil is extended, or a circuit board. The land surface of the circuit board to which the lead wire of the air-core coil is connected is provided with a protrusion-like lock piece provided on one edge, and the lock piece for locking the lead wire from the lead-out portion of the air-core coil It is characterized by spreading in the direction of.
[0008]
Furthermore, the air core coil mounting circuit board of the present invention is provided with two grooves through which the lead wire of the air core coil is passed on one edge of the circuit board, and one of the grooves starts from one edge of the circuit board. The other groove is cut from one edge of the circuit board to the position of the outer periphery of the air-core coil.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
The circuit board for mounting an air-core coil according to the present invention has a tongue-shaped locking piece for locking a lead wire with an extended winding of an air-core coil or a protrusion-like shape provided on one edge of the circuit board. The circuit board land that has the locking piece and connects the lead wire of the air-core coil is provided along the direction of the locking piece that locks the lead wire from the lead-out portion of the lead wire of the air-core coil. It is possible to increase the reliability of soldering by positioning the wire and increasing the soldering area of the lead wire.
[0010]
Furthermore, two grooves are provided on one edge of the circuit board to pass the lead wire of the air core coil, and one groove is cut from one edge of the circuit board to the position of the inner periphery of the air core coil, and the other groove. By cutting from one edge of the circuit board to the position of the outer periphery of the air-core coil, it is possible to secure insulation at the start and end of winding and facilitate the work of drawing the lead wire, thereby improving the work efficiency.
[0011]
【Example】
Hereinafter, an embodiment of an air core coil mounting circuit board according to the present invention will be described with reference to FIGS. 1 to 3. 1 to 3, the same reference numerals are used for the same components as in FIGS. 4 and 5 of the conventional example.
[0012]
In FIG. 1 and FIG. 2, another electronic component 2 constituting the circuit excluding the air-core coil is already attached to the circuit board 3. The tongue-like locking piece 4 for temporarily fixing the lead wire of the air-core coil 1 and for facilitating the soldering work of the lead wire is made by providing a notch on one edge of the circuit board. It has been. FIG. 3 shows, as another embodiment, a locking piece 7 having a rectangular projection with a narrowed base at one edge of a circuit board. Note that the shape of the locking piece is not limited to this embodiment, and a trapezoidal shape, an inverted triangular shape, a circular shape, a shape in which a tip is split and sandwiched may be used.
[0013]
The circuit board 3 is also provided with respective notch grooves 5a and 5b through which lead wires at the beginning and end of winding of the air-core coil 1 can be easily passed. The notch groove 5a is cut from the edge of the circuit board to the position of the inner peripheral portion of the air-core coil 1 because the winding lead wire 1a of the air-core coil 1 is drawn from the inner peripheral portion. . The notch groove 5b is cut from the edge of the circuit board to the position of the outer peripheral portion of the air-core coil 1 because the winding end lead wire 1b of the air-core coil 1 is drawn from the outer peripheral portion. This is because electric power is supplied from an AC power source, so that a high voltage is applied between the start and end of winding of the air-core coil 1, so that insulation is ensured so that the respective lead wires do not cross each other. .
[0014]
Further, each land 6a, 6b connecting the lead wire at the start of winding and the end of winding of the air-core coil 1 to the circuit board is in the direction of the locking piece 4 for locking the lead wire from the lead-out portion of the lead wire of the air-core coil. It is formed in a rectangle that spreads for a long time. As a result, the lead wire of the air-core coil and the solder surface of the land can be widened, and the reliability of soldering can be increased. In addition, the shape of the land surface is not rectangular, but it is preferable that the solder surface of the lead wire be wide, such as an oval, an ellipse, or an ellipse.
[0015]
As an operation for attaching the air core coil, first, the winding start lead wire 1a and the winding end lead wire 1b of the air core coil 1 are passed through the notch grooves 5a and 5b, and then put into a predetermined position with an adhesive or the like. Fix it. Then, the winding start lead wire 1a and the winding end lead wire 1b of the air-core coil 1 are respectively wound or wound around the tongue-like locking pieces 4. Then, the winding start lead wire 1a and the winding end lead wire 1b of the air-core coil 1 in contact with the surfaces of the lands 6a and 6b are respectively 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 entangled with the locking piece 4 are detached from the locking piece 4, and cut and removed by the solder portions of the lands 6a and 6b. Finish installation of air-core coil.
[0016]
【The invention's effect】
Thus, the air-core coil mounting circuit board of the present invention can be obtained by expanding the land surface connecting the lead wire along the lead wire of the air-core coil fixed to the tongue-like locking piece. The positioning of the wire can be facilitated and the reliability of soldering can be improved. In addition, by providing two notch grooves through which the lead wire of the air-core coil passes through the circuit board, insulation of the start and end of winding is ensured and the lead wire can be easily routed. An air core coil mounting circuit board that can improve efficiency can be provided.
[Brief description of the drawings]
FIG. 1 is an example 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. Other Embodiments [FIG. 4] Cross-sectional view of a non-contact charger [FIG. 5] 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

Claims (2)

In the circuit board for air core coil mounting,
Two grooves for passing the lead wire of the air-core coil are provided in a part of the end face of the circuit board, and one groove is cut from 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, and a tongue-like engagement for locking the lead wire to which the winding of the air core coil is extended. The land surface of the circuit board having a stop piece and connecting the lead wire of the air-core coil is along the direction of the lock piece for locking the lead wire from the groove of the lead-out portion of the lead wire of the air-core coil. An air core coil mounting circuit board characterized by being provided. 2. The air core coil mounting circuit board according to claim 1, wherein the locking piece is provided with a protrusion on one edge of the circuit board.

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