JP2005129730A - Input plug of electric apparatus and connection structure with circuit board - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain an input plug engaging/connecting structure for facilitating connecting work at a lower cost as compared with a case using a leaf spring clip. <P>SOLUTION: A springy metal wire 14 is employed as a means for holding the rear end part 13c of an input plug 13 penetrating the through hole 17 of a circuit board 12 against the circuit board 12 on the rear surface side thereof. The metal wire 14 is folded into substantial U-shape and has one closed end side and the other open end side provided with a pair of arm parts 14b, 14b parallel with each other. One end side of the metal wire 14 is secured in the through hole of the circuit board 12, i.e. a fixing hole 18, the pair of arm parts 14b, 14b on the other end side are arranged in correspondence with the through hole 17, rear end part 13c of the input plug 13 passed through the through hole 17 is held between the pair of arm parts 14b, 14b, and the input plug 13 is connected electrically and mechanically with the circuit board 12. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to an input plug engagement connection structure, and more particularly to a connection structure between an input plug and a circuit board of an electric device that electrically and mechanically connects an input plug to be inserted into a power outlet and a circuit board.

  For example, as a conventional structure for electrically and mechanically connecting an input plug incorporated in a charger and a circuit board, a connection structure as shown in FIG. 9 or a connection structure as shown in FIGS. 10 and 11 is known. It has been.

  That is, FIG. 9 is a longitudinal sectional view showing an example of a conventional input plug connection structure. In this connection structure, the input plug 1 and the circuit board 2 are connected by a lead wire 3 covered with polyvinyl chloride (PVC), and further between the lead wire 3 and the input plug 1 and between the lead wire 3 and the circuit. It has a structure in which the substrate 2 is fixed by soldering.

  10 and 11, the connection structure of the input plug of the electrical device and the circuit board includes a plug main body 1a, a rear end 1b extending rearward from the plug main body 1a, and the rear end 1b and the plug. A rear end portion of the input plug 1 until the flange portion 1c abuts with the plate-shaped input plug 1 integrally including a positioning flange portion 1c projecting outward from between the main body and the body. A circuit board 2 having a through hole 6 for inserting 1b and a mounting hole 8 for a leaf spring clip, and attached to the back surface of the circuit board 2 corresponding to the through hole 6, and penetrates the through hole 6. The rear end 1b of the input plug 1 is provided with a leaf spring clip 7 that is press-fitted to prevent engagement.

  The leaf spring clip 7 is inserted into the mounting hole 8 after the pin-like portion 7a is inserted and soldered on the back surface side, and the pair of clip pieces 7b and 7b are arranged on both sides with the through hole 6 interposed therebetween. Yes.

  Therefore, in the connection structure between the input plug and the circuit board of the electric device configured as described above, the through hole 6 faces the rear end portion 1b of the input plug 1 and the case 9 in which the input plug 1 is attached is provided. When the circuit board 2 is inserted, after the rear end portion 1b passes through the through hole 6, the rear end portion 1b is interposed between the pair of clip pieces 7b and 7b on the back side of the circuit board 2. The clip pieces 7b, 7b are pressed and expanded. As a result, a mechanical and electrical connection between the circuit board 2 and the input plug 1 can be obtained via the leaf spring clip 7.

There are many structures in which the input plug and the electrical components are electrically connected by using a wire-shaped metal wire instead of the connection between the input plug and the circuit board (for example, Patent Document 1). reference). This connection structure does not have a function of holding the input plug on the circuit board.
Japanese Patent Laid-Open No. 10-40963

  However, in the conventional input plug connection structure shown in FIG. 9, the input plug 1 and the circuit board 2 are connected by the lead wire 3, and further between the lead wire 3 and the input plug 1, and between the lead wire 3 and the circuit. Since the space between the substrate 2 and the substrate 2 is fixed by soldering, there is a problem that man-hours are required and the cost is increased. Furthermore, depending on the location, soldering work is difficult, and there are problems such as melting the device case and causing defects.

  On the other hand, the input plug engaging and connecting structure using the conventional leaf spring clip 7 shown in FIGS. 10 and 11 has the merit of being easy to incorporate and reducing the man-hours. However, there is a problem that the unit cost of the material cost of the leaf spring clip is high, and a high mold cost may be generated, which increases the cost as a whole.

  Therefore, there is a technical problem to be solved in order to obtain a connection structure between the input plug and the circuit board which is easy to connect and is cheaper than using a leaf spring clip. The purpose is to solve the problem.

  The present invention has been proposed in order to achieve the above object, and the invention according to claim 1 is a connection between an input plug and a circuit board of an electric device that connects the input plug inserted into a power outlet and the circuit board. In the structure, the plate-like input plug integrally having a plug main body and a rear end portion extending rearward from the plug main body, and the through hole into which the rear end portion of the input plug is inserted. A circuit board is mechanically and electrically connected between the input plug and the circuit board by being engaged with the rear end of the input plug attached to the back surface of the circuit board and passing through the through hole. It is an object of the present invention to provide a connection structure between an input plug of an electric device and a circuit board.

  According to this configuration, instead of a plate spring clip made of a conventional metal plate, the metal plug can be used to reduce the material cost and the processing cost compared to making a metal plate material. The end portion is held, and the input plug and the circuit board can be mechanically and electrically connected via the metal wire.

  According to a second aspect of the present invention, the metal wire has a spring property, and is formed in a substantially U shape by providing a pair of arms closed at one end and parallel to the other end. The input plug in which the one end side of the wire is fixed to the mounting hole of the circuit board, the pair of arm portions are arranged in correspondence with the through hole, and the through hole is passed between the pair of arm portions. The input plug connection structure according to claim 1, wherein the rear end portion is press-fitted so that the input plug and the metal wire are engaged with each other.

  According to this configuration, on the back side of the circuit board, the rear end of the input plug that has passed through the through hole of the circuit board is clamped from both sides by the spring force of the pair of arm parts. The input plug and the circuit board can be mechanically and electrically connected via the wire.

  According to a third aspect of the present invention, an engagement hole is provided in the rear end portion of the input plug, and the engagement of the input plug that has passed through the through hole of the circuit board in at least one of the pair of arm portions. It is an object of the present invention to provide a connection structure between an input plug of an electric device and a circuit board, wherein a projecting portion that falls into the fitting hole and causes a click feeling simultaneously with the engagement is provided.

  According to this configuration, when the protrusion of the metal wire falls into the engagement hole, it is possible to give a click feeling to the installation worker. Moreover, after attachment, it becomes difficult to remove | deviate between a metal wire and an input plug by the said depression engagement.

  According to a fourth aspect of the present invention, there is provided a connection structure between an input plug of an electric device and a circuit board according to the second or third aspect, wherein the mounting hole of the circuit board for fixing the metal wire is a through hole.

  According to this configuration, the electrical connection between the metal wire and the circuit board can be simplified by attaching the metal wire to the attachment hole which is a through hole.

  According to a fifth aspect of the present invention, the rear end portion of the input plug has a wedge-shaped portion whose width gradually decreases toward the insertion distal end side, and the input that penetrates the through hole of the circuit board. The inclined surface of the wedge-shaped portion of the plug is brought into pressure contact with the metal wire to generate a reaction force on the metal wire, and the input plug and the metal wire are engaged by the reaction force of the metal material. It is an object of the present invention to provide a connection structure between an input plug of an electric device and a circuit board.

  According to this configuration, when the rear end portion of the input plug is inserted into the through hole of the circuit board, and the inclined surface of the wedge-shaped portion in the input plug collides with the metal wire, further pressing further causes the inclined surface of the wedge-shaped portion to The metal wire is in a state of biting into and receives a reaction force from the metal member side, and the reaction force of the metal wire increases the contact pressure between the metal wire and the wedge-shaped part, and this strong contact pressure is input. The plug and the metal wire can be engaged.

  According to a sixth aspect of the present invention, the metal wire is made as a coil spring, and a rear end portion of the input plug is sandwiched between adjacent coil winding portions to engage the input plug and the metal wire. According to another aspect of the present invention, there is provided a connection structure between an input plug of an electric device and a circuit board.

  According to this configuration, the metal wire and the input plug can be engaged only by setting the rear end portion of the input plug between the coil winding portion of the coil spring.

  The connection structure between the input plug and the circuit board of the electrical device according to claim 1 of the present invention uses a metal wire that can keep material costs and processing costs cheaper than the leaf spring clip used in the conventional structure. Therefore, the cost can be reduced, and it can be provided at a low cost.

  According to a second aspect of the present invention, there is provided a connection structure between the input plug and the circuit board of the electric device, wherein the rear end of the input plug is clamped from both sides by the spring force of the pair of arms. In addition to the effect of the first aspect of the invention, the mechanical connection and the electrical connection between the input plug and the circuit board can be simplified. it can.

  According to a third aspect of the present invention, there is provided a connection structure between an input plug and a circuit board of an electric device, wherein when the protruding portion of the metal wire falls into the engagement hole, the mounting operator is given a click feeling, and the click feeling provides a predetermined position. In addition to the effect of the invention of claim 2, the assembly work is easy, and after the attachment, the protrusion and the engagement hole are engaged with each other. Thus, it is possible to prevent the input plug and the circuit board from being easily separated.

  In the connection structure between the input plug and the circuit board of the electric device according to claim 4 of the present invention, the metal wire is attached to the attachment hole which is a through hole. In addition to the effect of the invention according to claim 2 or 3, The electrical connection work between the wire and the circuit board is further simplified.

  According to a fifth aspect of the present invention, there is provided a connection structure between an input plug and a circuit board of an electric device, wherein the input plug and the metal wire are formed by a reaction force generated between the inclined surface of the wedge-shaped portion of the input plug and the metal wire. In addition to the effect of the first aspect of the invention, reliable mechanical connection and electrical connection between the input plug and the circuit board can be achieved.

  According to a sixth aspect of the present invention, in addition to the effect of the first aspect of the invention, in addition to the effect of the first aspect of the invention, the connection structure between the input plug of the electric device and the circuit board is provided between the coil winding portion of the coil spring and the rear end of the input plug. Since the input plug and the circuit board can be engaged with each other through the metal wire, the mechanical connection between the input plug and the circuit board is added to the effect of the invention of claim 1. And electrical connection can be simplified.

  In order to achieve the purpose of obtaining an input plug connection structure that is easy to connect and is cheaper than using a leaf spring clip, the rear end of the input plug that has passed through the through hole of the circuit board is As a means for holding the circuit board, a metal wire having a spring property was used. The metal wire is bent in a substantially U shape, closed at one end, and opened at the other end with a pair of arms parallel to each other. And while fixing the said one end side of this metal wire to the attachment hole of the said circuit board, it arrange | positions a pair of arm part of the other end side corresponding to the said through hole, and the said input plug which passed the said through hole The rear end portion is sandwiched and held between the pair of arm portions.

  1 and 2 show a charger, particularly a plug-in unit such as an AC adapter and a battery charger, as a first embodiment to which a connection structure between an input plug and a circuit board of an electric device according to the present invention is applied. 1 is a longitudinal sectional view of the charger, and FIG. 2 is a sectional view taken along line AA of FIG. 1 and 2, a plug-in unit 10 includes a resin case 11 composed of a lower case half 11a and an upper case half 11b, a circuit board 12 housed in the case 11, An input plug 13 attached to the lower case half 11 a of the case 11 and a metal wire 14 for conducting electrical connection between the input plug 13 and the circuit board 12 are provided.

  More specifically, the input plug 13 is formed as an elongated metal plate having a cross shape as a whole by providing a flange portion 13a serving as a positioning portion protruding in the left-right direction at the intermediate portion, and is formed on the front side of the flange portion 13a. Is a plug body 13b to be plugged into a power outlet, and the rear side is a rear end portion 13c. The rear end 13c is provided with a penetrating engagement hole 15. Further, a taper portion 13d is provided on the front end side of the rear end portion 13c so as to gradually become thinner as it proceeds toward the rear end side.

  A plug body 13b is inserted into the lower case half body 11a from the inside until the flange 13a abuts the inner surface of the lower case half body 11a, and the front end side of the plug body 13b is located outside the lower surface of the lower case half body 11a. A mounting hole 16 is formed so as to protrude from the top. The input plug 13 may be integrated by being inserted when the lower case half 11a is molded.

  The circuit board 12 is provided with printed wiring (not shown), and various electric parts for charging are mounted on the printed wiring. A through hole 17 into which the rear end portion 13 c of the input plug 13 is inserted is provided at a position corresponding to the input plug 13, and a mounting hole 18 into which the metal wire 14 can be inserted around the through hole 17. Is provided. In the structure of the first embodiment, the mounting hole 18 is a through hole, but it does not necessarily have to be a through hole.

  FIG. 3 is an external perspective view of the metal wire 14. The metal wire 14 is formed by folding a wire-like metal material having a spring property into a substantially U shape, and folding a part 14a on the closed side (hereinafter referred to as “closed end side portion 14a”) at a substantially right angle to open. The side portions are a pair of arm portions 14b and 14b that serve as clamping portions for sandwiching the rear end portion 13c of the input plug 13 from both sides, and a part of the pair of arm portions 14b and 14b is mutually inward. Protruding protrusions 14c and 14c are provided. The distance between the pair of arm portions 14 b and 14 b is larger than the smallest thickness of the tapered portion 13 d of the input plug 13 and slightly smaller than the thickness of the input plug 13. The metal wire 14 is inserted into the mounting hole 18 of the circuit board 12 at the closed end side portion 14a, soldered to the mounting hole 18 and pre-installed in the circuit board 12, and the pair of arm portions 14b and 14b penetrate therethrough. The holes 17 are arranged on both sides of the hole 17. In FIG. 1, the part denoted by reference numeral 19 is solder that fixes the space between the mounting hole 18 and the closed end side part 14a.

  Next, an example of the assembly procedure of the plug-in unit 10 configured as described above will be described. First, the lower case half 11a with the input plug 13 attached and the circuit board 12 with the metal wire 14 already attached are prepared. Then, the rear end portion 13c of the input plug 13 faces the through hole 17 of the circuit board 12, and the circuit board 12 is inserted into the lower case half 11a. As a result, the rear end portion 13 c of the input plug 13 is inserted into the through hole 17. Further, after passing through the through hole 17, on the back side of the circuit board 12, the rear end portion 13c is press-fitted into the pair of arm portions 14b, 14b while expanding between the pair of arm portions 14b, 14b with a taper 14e. Is done. Further, when the rear end portion 13c is inserted to a predetermined position, that is, a position where the engaging hole 15 corresponds to the protruding portion 14c, the protruding portion 14c falls into the engaging hole 15, and the click feeling at the time of dropping is operated. One gets. As a result, the pair of arm portions 14b, 14b are brought into pressure contact with both side surfaces of the rear end portion 13c so that the rear end portion 13c and the metal wire 14 are engaged, and the engagement hole 15 and the projecting portions 14c, 14c are engaged. , The input plug 13 is prevented from being detached from the circuit board 12, and the assembly is completed.

  Therefore, in the structure of the plug-in unit 10 configured as described above, the wire-like metal wire 14 that can significantly reduce the material cost and the processing cost as compared with the leaf spring clip used in the conventional structure is used. Therefore, the cost can be reduced, and the electric device can be provided at a low cost.

  Further, since the rear end portion 13c of the input plug 13 is clamped by the spring-like contact pressure of the metal wire 14, the electrical connection between the input plug 13 and the metal wire 14 is performed simultaneously with the mechanical engagement. A connection is also obtained.

  Further, when the metal wire 14 is inserted to a predetermined position, that is, the position where the projecting portions 14c, 14c fall into the engagement hole 15, the projecting portions 14c, 14c of the metal wire 14 fall into the engagement hole 15 and work. Since the click feeling is given to the person, the attaching operator can easily know that the attachment is attached to the predetermined position from the click feeling, and the workability is improved.

  4 and 5 show a second embodiment of the charger to which the connection structure between the input plug and the circuit board of the electric device according to the present invention is applied, and FIG. 5 is from the direction along line BB in FIG. FIG. The structure of the charger in the second embodiment is different in the engagement structure between the rear end portion 13c of the input plug 13 and the metal wire 14, and the other configurations are the same as those in FIGS. The same components are denoted by the same reference numerals and description thereof is omitted.

  In this structure, a wedge-shaped portion 20 having a tapered shape whose width gradually decreases toward the insertion distal end side of the through hole 17 is integrally provided at the rear end portion 13 c of the input plug 13.

  As shown in a perspective view of the appearance of the metal wire 14 in FIG. 6, the metal wire 14 folds the wire-like metal material having a spring property into a substantially U shape, and closes the closed end on the closed side. The side portion 14a is bent at a right angle, and the open side portion is used as a pair of arm portions 14b and 14b for attachment. Then, the pair of arm portions 14b and 14b are respectively inserted into the mounting holes 18 of the circuit board 12, and the pair of arm portions 14b and 14b are soldered 19 to the mounting holes 18, so that the metal wire 14 is preliminarily attached to the circuit board 12. The closed end side portion 14 a that is attached in a loop shape is disposed in correspondence with the through hole 17. Further, the lower end of the closed end side portion 14a is positioned slightly above the root position of the wedge-shaped portion 20.

  Next, an example of the assembly procedure of the plug-in unit 10 in the structure of the second embodiment will be described. First, the lower case half 11a to which the input plug 13 is attached and the circuit board 12 to which the metal wire 14 is already attached are prepared. Then, the rear end portion 13c of the input plug 13 faces the through hole 17 of the circuit board 12, and the circuit board 12 is inserted into the lower case half 11a. As a result, the rear end portion 13 c of the input plug 13 is inserted into the through hole 17. When the rear end portion 13c passes through the through hole 17, the wedge-shaped portion 20 of the rear end portion 13c is press-fitted into the closed end side portion 14a while expanding the closed end side portion 14a. When the wedge-shaped portion 20 is inserted to a predetermined position, the lower side of the inclined surface of the wedge-shaped portion 20 abuts on the closed end side portion 14a of the metal wire 14. In this state, the wedge-shaped portion 20 bites into the metal wire 14, causes a reaction force to the metal wire 14, and the contact pressure between the metal wire 14 and the wedge-shaped portion 20 becomes stronger. Therefore, the input plug 13 and the metal wire 14 are mechanically and electrically coupled with each other with the strong contact pressure. As a result, the input plug 13 is mechanically engaged by the pressing to the through hole 17 and is prevented from coming off, and the mechanical and electrical connection between the circuit board 12 and the input plug 13 via the metal wire 14 is prevented. Connection is complete.

  Therefore, even in the structure of the plug-in unit 10 according to the second embodiment configured as described above, a wire shape that can significantly reduce the material cost and the processing cost as compared with the leaf spring clip used in the conventional structure. By using the metal wire 14, the cost can be reduced, and the metal wire 14 can be provided at a low cost. Further, the mechanical and electrical connection between the input plug 13 and the metal wire 14 is ensured by the contact pressure generated between the wedge-shaped portion 20 and the metal wire 14 as the circuit board 12 is inserted.

  7 and 8 show a third embodiment of the charger to which the connection structure between the input plug and the circuit board of the electric device according to the present invention is applied. FIG. 7 is a longitudinal sectional view thereof, and FIG. It is CC sectional view taken on the line. The structure of the charger in the third embodiment is different in the engagement structure between the rear end portion 13c of the input plug 13 and the metal wire 14, and the other configurations are the same as those in FIGS. The same components are denoted by the same reference numerals and description thereof is omitted.

  In this structure, a coil spring 21 as a metal wire is attached to the rear end portion 13 c of the input plug 13. The coil spring 21 is formed by forming a wire-like metal material having spring properties into a coil shape. When the rear end portion 13c of the input plug 13 is inserted between the adjacent coil winding portions 21a and 21a, the rear end portion 13c is sandwiched by the spring force of the coil itself, and mechanical and An electrical connection is obtained. A part of the coil spring 21 is soldered in advance to a wiring pattern (not shown) of the circuit board 12 and attached to a position corresponding to the through hole 17.

  Further, on the circuit board 12, the regulating wall member 22 is fixedly provided at both ends of the coil spring 21. The restriction wall member 22 receives the end of the coil spring 21 and restricts the coil spring 21 from spreading in the longitudinal direction when the coil spring 21 is about to extend a predetermined length or more in the longitudinal direction.

  Next, an example of the assembly procedure of the plug-in unit 10 in the structure of the third embodiment will be described. First, the lower case half 11a to which the input plug 13 is attached and the circuit board 12 to which the coil spring 21 has already been attached are prepared. Then, the rear end portion 13c of the input plug 13 faces the through hole 17 of the circuit board 12, and the circuit board 12 is inserted into the lower case half 11a. As a result, the rear end portion 13c of the input plug 13 is inserted into the through hole 17, and when passing through the through hole 17, on the back side of the circuit board 12, the taper portion 13d of the rear end portion 13c is adjacent to each other. It press-fits between the coil winding parts 21a and 21a while expanding between the parts 21a and 21a.

  Thereby, a pair of coil winding parts 21a and 21a are press-contacted to the both sides | surfaces of the rear-end part 13c, and the mechanical and electrical connection between the input plug 13 and the coil spring 21 is achieved. Further, in this state, both end sides of the coil spring 21 are brought into contact with the restriction wall member 22, respectively, and the movement of the coil spring 21 in the longitudinal direction is restricted by the restriction wall member 22, and contact with the rear end portion 13c of the input plug. Stabilize the pressure.

  Therefore, even in the structure of the third embodiment, the coil spring 21 made of a wire-like metal wire capable of remarkably reducing the material cost and the processing cost as compared with the leaf spring clip used in the conventional structure is used. As a result, the cost can be reduced and it can be provided at a low cost. Further, by inserting the rear end portion 13c of the input plug 13 between the coil winding portion 21a and the coil winding portion 21a of the coil spring 21 which is a metal wire material, the input plug 13 is connected to the circuit board via the coil spring 21. Since it can fix easily with respect to 12, workability | operativity improves.

  It should be noted that the present invention can be variously modified without departing from the spirit of the present invention, and the present invention naturally extends to the modified ones.

The longitudinal cross-sectional view of the charger which concerns on the 1st Example of this invention. AA sectional view taken on the line AA of FIG. The external appearance perspective view of the metal wire currently used with the charger of a 1st Example. The longitudinal cross-sectional view of the charger which concerns on the 2nd Example of this invention. BB sectional drawing of FIG. The external appearance perspective view of the metal wire currently used with the charger of a 2nd Example. The longitudinal cross-sectional view of the charger which concerns on the 3rd Example of this invention. CC sectional view taken on the line of FIG. The longitudinal cross-sectional view of the charger shown as an example of the conventional structure. The longitudinal cross-sectional view of the charger shown as another example of a prior art structure. The top view seen from the DD line | wire direction of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Plug-in unit 11 Case 12 Circuit board 13 Input plug 13b Plug main body 13c Rear end part 14 Metal wire 14a Closed end side part
14b Arm part 14c Projection part 14d Bending part 15 Engagement hole 16 Attachment hole 17 Through hole 18 Attachment hole 19 Solder 20 Wedge-like part 21 Coil spring (metal wire)
21a Coil winding part

Claims (6)

In the connection structure between the input plug and circuit board of the electrical equipment that connects the input plug plugged into the power outlet and the circuit board,
A plate-like input plug integrally having a plug body and a rear end extending rearward from the plug body;
The circuit board having a through hole into which the rear end of the input plug is inserted;
A metal wire that is attached to the back surface of the circuit board and is mechanically and electrically connected between the input plug and the circuit board by being engaged with the rear end portion of the input plug that has passed through the through hole;
A connection structure between an input plug of an electrical device and a circuit board.   The metal wire has a spring property and has a pair of arms that are closed at one end and parallel to the other end. The metal wire is substantially U-shaped, and the one end of the metal wire is connected to the circuit board. While fixing to the mounting hole, the pair of arm portions are arranged corresponding to the through hole, and the rear end portion of the input plug that has passed through the through hole is press-fitted between the pair of arm portions. 2. A connection structure between an input plug of an electric device and a circuit board according to claim 1, wherein the input plug and the metal wire are engaged with each other.   An engagement hole is provided in the rear end portion of the input plug, and at least one of the pair of arm portions falls into the engagement hole of the input plug that has passed through the through hole of the circuit board. 3. A connection structure between an input plug of an electrical device and a circuit board according to claim 2, further comprising a protrusion that causes a click feeling at the same time.   4. The connection structure between an input plug of an electric device and a circuit board according to claim 2, wherein the mounting hole of the circuit board for fixing the metal wire is a through hole.   The rear end portion of the input plug has a wedge-shaped portion whose width gradually decreases toward the insertion distal end, and the inclined surface of the wedge-shaped portion of the input plug that has passed through the through hole of the circuit board. 2. The metal wire is pressed against the metal wire to generate a reaction force, and the input plug and the metal wire are engaged with each other by the reaction force of the metal wire. Connection structure between the input plug of electrical equipment and the circuit board.   The metal wire is made as a coil spring, and a rear end portion of the input plug is sandwiched between coil winding portions adjacent to each other so as to be engaged with the input plug. A connection structure between the input plug of the electric device described above and the circuit board.

Images