WO2014034610A1

WO2014034610A1 - Ground sheet metal for ac inlet, grounding structure of ac inlet and grounding method for ac inlet

Info

Publication number: WO2014034610A1
Application number: PCT/JP2013/072745
Authority: WO
Inventors: 信之向野
Original assignee: Eizo株式会社
Priority date: 2012-08-29
Filing date: 2013-08-26
Publication date: 2014-03-06
Also published as: JP5723992B2; JPWO2014034610A1

Abstract

The purpose of the present invention is to provide a grounding structure of an AC inlet, the grounding structure being a structure which enables stable ground connection work without requiring familiarization of the work although at least double connection is used for safe grounding in an electronic device, and being also applicable to AC inlets on the market. The present invention is a grounding structure of an AC inlet (200), wherein a grounding terminal (203) of the AC inlet (200) and a chassis (100) are ground-connected, and bent ground sheet metal (10A) is used. A joint piece (16) which is inserted in a hole (213) of the grounding terminal (203) is formed at one end side of the ground sheet metal (10A), and a constriction (15) for inserting and fitting the joint piece (16) in the hole (213) of the grounding terminal (203) and soldering the joint piece and the hole to each other is formed in the joint piece (16). The joint piece (16) is inserted and fitted into the hole (213) of the grounding terminal (203), and the joint piece and the hole are soldered to each other by solder (33).

Description

Earth plate for AC inlet, AC inlet grounding structure, and AC inlet grounding method

The present invention relates to an AC inlet ground sheet metal, an AC inlet grounding structure, and an AC inlet grounding method.

In addition to electronic devices such as image display devices and personal computers, electrical and electronic devices such as electric appliances such as microwave ovens and water heaters generally have an AC-DC power supply circuit built therein. These electric / electronic devices are provided with a three-pole AC inlet. An AC cord with a three-terminal plug is inserted into the AC inlet, and a DC power source obtained by converting DC power from the AC power source is used. Various electronic circuits and electric circuits are configured to operate. In this specification, these electric / electronic devices are simply referred to as electronic devices.

FIG. 37 is a perspective view illustrating a conventional grounding structure of an AC inlet in an electronic device. The AC inlet 200 includes a main body portion 201 and three

terminals

202, 203, and 204 fitted and fixed to the main body portion 201. In a general AC inlet 200, the ground terminal 203 is arranged at a position between the AC power terminals 202 and 204 (see FIG. 37). Here, the AC inlet 200 is designed to conform to various safety standards such as the IEC standard.

Examples of the safety standard include IEC standard, UL standard, EN standard, CCC standard, PSE standard, KOSHA standard, and the like. The IEC standard is an international standard for electrical and electronic equipment by the International Electrotechnical Commission of the International Organization for Standardization. UL (Underwriters Laboratories Inc.) is a safety standard for electrical and electronic equipment in North America. EN (European Standard) is a safety standard for electrical and electronic equipment in Europe. CCC (China Compulsory Certification) is a safety standard for electrical and electronic equipment in China. PSE (Product Safety, Electrical, Appliances, and Materials) shows that it meets the Japanese Electrical Appliances Safety Law. KOSHA (Korea Occupational Safety and Health Agency) shows that it satisfies the Korean Industrial Health Law.

In these electronic devices, the AC inlet 200 is attached to the chassis 100 which is a part of the casing, and the ground terminal 203 and the chassis 100 are grounded by a predetermined ground lead 300 (FIG. 37). The chassis 100 has conductivity for ground connection. Examples of the chassis 100 include a ground metal plate made of a conductive metal, and a metal plate plated on a ground metal plate or a resin. In some cases, the conductive chassis 100 is simply referred to as the chassis 100. On the back side (or front side) of the chassis 100, for example, a substantially square mounting hole 101 for mounting the AC inlet 200 is formed, and a female screw hole 102 for M4 screw is formed on the side surface side of the chassis 100. A circuit board 91 constituting a predetermined power supply circuit is disposed on the lower side of the chassis 100 (FIG. 37). The AC inlet 200 is fitted and fixed to the chassis 100 by inserting the main body 201 from the chassis mounting hole 101 with the left and right engaging

portions

211 and 211 closed, and opening the left and right

engaging portions

211 and 211. The In the AC inlet 200,

AC power terminals

202 and 204 are attached to the mounting holes of the circuit board 91, fixed, soldered, and connected to a predetermined power circuit (see FIG. 37).

The ground connection is a ground potential so as not to get an electric shock when a person touches the chassis 100. In addition, since an electronic device may malfunction when electromagnetic waves or static electricity enter from the outside, the electronic device is shielded (shielded) by the ground connection.

In order to make the ground connection a connection that is regarded as a safety ground according to safety standards, in the configuration example shown in FIG. 37, the ground terminal 203 of the AC inlet 200 is grounded to the chassis 100 by a predetermined ground lead 300. More specifically, they are connected as follows.

FIG. 39 is a diagram showing a connection structure between the chassis 100 and the ground lead wire 300. For example, a female screw hole 102 for an M4 screw is formed on the side surface side of the chassis 100 (FIG. 38), and the ground lead wire 300 is formed by using a UL-AWM 1015- # 18 covered electric wire 301. The stranded wire 313 on one end side is fixed by caulking to the spectacle terminal 302, and the spectacle terminal 302 and the chassis 100 are coupled by the M4 screw 500 (FIG. 39). The M4 screw 500 uses a screw with a spring washer. In this configuration, the chassis 100 and the glasses terminal 302 are fastened so as not to be loosened by the M4 screw 500 with a spring washer so that the ground connection may not be disconnected. Therefore, it can be said to be a safety ground connection.

In order to establish a safety ground connection, the connection between the ground terminal 203 of the AC inlet 200 and the ground lead wire 300 can be performed by using a plurality of types of connection methods so that the ground lead wire 300 may not be disconnected. It is essential to make a “double connection”. In particular, as shown in FIG. 40, it is difficult to increase the terminal size of the ground terminal 203 because of its structure, and soldering is required to reduce the connection resistance value. The mechanical strength cannot be secured. Therefore, it is necessary to provide another fixing means in addition to soldering.

As shown in FIG. 40, the ground terminal 203 of the commercially available AC inlet 200 has a so-called lug plate shape and protrudes from the main body 201, and an elliptical long hole 213 is opened at the center thereof. The size of the ground terminal 203 is about 3.5 mm in width and about 7 mm in length, and the size of the long hole 213 is about 2 mm in width and about 4 mm in length.

41 and 42 are diagrams illustrating a conventional connection structure between the ground terminal 203 of the AC inlet 200 and the lead wire 300 for grounding. In this configuration, for example, the twisted wire 313 on the other end side of the covered electric wire 301 of the ground lead wire 300 is bent and passed through the long hole 213 of the ground terminal twice to be fixed by winding 1.5 times or more ( After that, in order to reduce the conduction resistance, the stranded wire 313 and the ground terminal 203 are soldered (FIG. 42). This method is intended to prevent the ground lead wire 300 from coming off. However, when soldering, the stranded wire 313 may be frayed by heating, and the stranded wire 313 may be frayed and behaved. It is necessary to confirm whether or not Further, depending on the arrangement configuration in the equipment, usage conditions, and the like, heat shrinkage may be performed so that the stranded wire 313 is not frayed due to heat, vibration, or the like and the safety distance from the

AC power terminals

202 and 204 is not insufficient. Covering the boundary portion between the soldering portion 303, the ground terminal 203, and the ground lead wire 300 with a tube (not shown).

As shown in FIGS. 41 and 42, in the conventional structure, the work of winding the stranded wire 313 of the grounding lead wire 300 around the ground terminal 203 of the AC inlet 200 is complicated and requires learning. There is a problem of stabilization. Further, by attaching a large earth lead 300, the space around the AC inlet 200 is occupied.

43 is a view showing another example of a conventional connection structure between the ground terminal 203 of the AC inlet 200 and the ground lead wire 300. FIG. In this configuration, for example, the ground terminal 203 is a Faston terminal # 250 MALE. Reference numeral 323 in FIG. 43 denotes a faston terminal # 250 FEMALE. The grounding lead wire 300 uses a wire 313 on the other end side of the covered electric wire 301 and a faston terminal 323 that are fastened by caulking. The grounding terminal 203 is inserted into the faston terminal 323 and fastened. . Further, depending on the arrangement configuration in the device, usage conditions, and the like, an insulation tube (not shown) may be used to fasten the safety distance from the

AC power terminals

202 and 204 due to vibration or the like. Covering terminal # 250 FEMALE is performed.

As shown in FIG. 43, since the conventional structure requires the Faston terminal 323, a dedicated tool is required and the number of work processes increases. Further, by attaching the large Faston terminal # 250 and the ground lead wire 300, the space around the AC inlet 200 is occupied.

Patent documents 1-4 have been published as AC inlet grounding structures.

Patent Document 1 describes a structure in which an AC inlet ground terminal is inserted into a hole having a predetermined shape formed in a tongue portion of a frame, and a tip portion thereof is twisted and fixed with a dedicated tool. The structure described in Patent Document 1 is a plate-like custom specification in which no hole is formed in the AC inlet ground terminal, and a dedicated tool for twisting and fixing is required.

Patent Document 2-3 describes a structure in which a mounting bracket and an AC inlet ground terminal are connected by soldering. The structure described in Patent Document 2-3 is intended to be connected and fixed by soldering, but mechanical strength cannot be ensured only by soldering, and it is not a safe earth connection.

Patent Document 4 describes a structure in which a mounting bracket and an AC inlet ground terminal are connected by screw fixing. In order to establish a safety ground connection in the structure described in Patent Document 4, it is necessary to fasten with an M4 screw with a spring washer. Therefore, the AC inlet grounding terminal has a plate-like shape with a large hole into which the M4 screw is inserted. It becomes a custom specification, and screwing on the ground terminal side is not workable because there is no work space.

JP 2001-332318 A Japanese Utility Model Publication No. 06-013081 Japanese Utility Model Publication No. 01-158678 Japanese Patent Laid-Open No. 06-243932

As described above, in order to establish a safety ground connection, the connection between the AC inlet ground terminal and the ground connection member (ground metal plate or lead wire) is made so that the ground connection member does not loosen and come off. "Double connection". Further, there is a demand for a structure that allows a double connection operation to be performed stably and relatively easily even if it is not a skilled worker. Further, as the AC inlet ground terminal, it is preferable to use a ground terminal having a so-called lug plate shape and provided with an elliptical oblong hole, which increases versatility. And the structure which can do a double connection without using a special tool is preferable.

However, in Patent Documents 1-4, the AC inlet ground terminal is a custom specification, and a tool is required. In Patent Document 2-3, connection is fixed by soldering. However, mechanical strength cannot be ensured only by soldering, and it is not safe ground connection. The structure in which the twisted wire of the ground lead wire wound around the AC inlet grounding terminal, which has been performed for a long time, is complicated and requires learning, and there is a problem that the quality becomes unstable due to work variations. In addition, the structure in which the faston terminal of the ground lead wire is attached to the AC inlet ground terminal has a problem that a dedicated tool is required and the number of work steps increases.

Accordingly, in view of the above-described problems, an object of the present invention is a structure that enables stable ground connection work in an electronic device, without requiring work proficiency, while providing at least a double connection as a safety ground. Another object of the present invention is to provide a grounding sheet metal for AC inlet, a grounding structure for AC inlet, and a grounding method for AC inlet which can be applied to a commercially available AC inlet.

The grounding sheet metal for AC inlet according to the present invention is a grounding sheet metal for AC inlet for grounding the grounding terminal of the AC inlet and the chassis, and is inserted into the hole of the grounding terminal at one end side of the grounding sheet metal. The joining piece is formed with a step or constriction for fitting with the ground terminal, and the joining piece is inserted into the hole of the ground terminal and joined. It is characterized by making it.

According to the present invention, the safety ground becomes a double connection of fitting and joining by inserting and joining the joining piece into the hole of the ground terminal. Further, a joining piece to be inserted into the hole of the grounding terminal is formed on one end side of the ground metal plate, and the joining piece has a step or constriction for fitting with the grounding terminal. Double connection work can be performed stably without the need for work learning and without the use of tools. That is, the ground sheet metal of the present invention has a novel structure different from either the ground lead wire or the faston terminal, and the ground sheet metal joint piece of the present invention is simply inserted into the hole of the ground terminal and joined. In this simple operation, the safety ground becomes a double connection of fitting and joining, and the work quality is also stable.

The earth sheet metal is made of a metal material. For example, the ground metal plate is formed by subjecting a conductive metal plate material such as iron, stainless steel, aluminum, brass, or copper to press processing or sheet metal processing. In order to improve conductivity and solderability, it is preferable to perform known surface treatments such as plating, vapor deposition, sputtering, and surface modification treatment on the ground metal plate. By bending the ground metal plate into an L shape, the shape stability is improved and the plate also functions as a leaf spring. That is, it is possible to increase the fitting force with the ground terminal by using the restoring force of the ground metal plate as a plate spring. The earth sheet metal also has a function of protecting an electronic component mounted on the substrate of the electronic device from static electricity by utilizing a shielding effect that suppresses external noise (electrical noise) of the metal material.

Examples of the bonding include brazing, thermocompression bonding, and adhesion using a conductive adhesive. As a result of the joining, the joining piece of the ground metal plate and the ground terminal of the AC inlet are electrically connected and mechanically joined.

When the step is formed in the joining piece, there are a configuration in which the step is fitted at a narrow width portion and a configuration in which the step is fitted at a wide portion beyond the step position. When the constriction is formed in the joining piece, the constriction position is used. For example, the constriction is formed by forming notches on both sides of the joining piece. For example, the constriction is formed by forming steps on both sides of the joining piece.

In the present invention, the joint piece is formed with a constriction for fitting with the ground terminal, and a head portion is formed on the distal end side of the joint piece. The width of the long hole of the ground terminal is larger than the width of the long hole of the ground terminal and smaller than the width of the long hole of the ground terminal.

Since the hole of the ground terminal is a long hole, the AC inlet does not have to be a custom specification, and a commercially available AC inlet can be applied. According to the present invention, the joint can be fitted in the short direction of the long hole of the ground terminal, and the head of the joint piece can be prevented from coming off, and then joined. Therefore, the safety ground can be a triple connection of fitting, retaining and joining.

The present invention is characterized in that one end side where the joining piece is formed is bent into an L shape in a direction intersecting with the ground terminal when extending from the chassis side.

According to the present invention, the routing of the ground from the ground terminal to the electronic device side is a compact and wasteful routing.

In the present invention, when the one end side on which the joining piece is formed is extended from the chassis side, the other end side of the ground sheet metal is bent into an L shape in a direction overlapping the chassis, and A through hole for screwing to the chassis is formed on the other end side of the ground metal plate.

According to the present invention, it is possible to easily make a safety ground of an existing electronic device a double connection or a triple connection.

An AC inlet grounding structure according to the present invention is an AC inlet grounding structure in which a grounding terminal of an AC inlet and a chassis are grounded. A grounding metal plate having a predetermined shape is used, and one end side of the grounding metal plate is connected to the grounding metal. A joining piece to be inserted into the hole of the ground terminal is formed, and the joining piece is formed with a step or a constriction for fitting the joining piece with the ground terminal, and the joining piece is formed in the hole of the ground terminal. It is inserted, fitted and joined.

According to the present invention, since the joining piece is inserted into the hole of the ground terminal and fitted and joined, the safety ground becomes a double connection of fitting and joining. Further, a joining piece to be inserted into the hole of the grounding terminal is formed on one end side of the ground metal plate, and the joining piece has a step or constriction for fitting with the grounding terminal. The structure is such that double connection work can be stably performed without using work learning and without using a tool. In other words, according to the present invention, neither a ground lead wire nor a faston terminal is used, and the joining piece is inserted into the hole of the ground terminal and is simply fitted and joined. Work quality is also stable.

According to the present invention, the joint piece is formed with a constriction for fitting the joint piece, and the joint is brazed, and the joint piece is inserted into a hole of the ground terminal and is placed in the constricted position. It is characterized by being fitted and brazed.

According to the present invention, by being fitted at the constricted position, the molten alloy spreads over the place where the joining piece is fixed to the hole of the ground terminal, and is soldered to form a strong bond. Examples of the brazing include soldering and brazing. In either case, an alloy having a melting point lower than that of the ground metal plate and the ground terminal is melted and joined.

The hole shape of the ground terminal is round, oval, elliptical, triangular, quadrangular, rounded square, trapezoid, pentagon, hexagon, octagon, slit, or any other shape. It is possible. For example, when the hole of the ground terminal is a round hole, the width dimension of the head formed on the tip side of the joint piece is larger than the width dimension of the constricted portion of the joint piece, and the ground terminal Smaller than the inner diameter of the round hole. And the width dimension of the base part of the said joining piece is made the same or slightly larger than the internal diameter dimension of the round hole of the said grounding terminal, and the base part of the said joining piece and the round hole of the said grounding terminal are fitted.

According to the present invention, the hole of the ground terminal is a long hole, the joining piece is formed to protrude in the width direction on one end side of the ground metal plate, and the joining piece is short of the long hole of the ground terminal. It is fitted in the hand direction.

According to the present invention, since the hole of the ground terminal is a long hole, the AC inlet does not have to be a custom specification, and a commercially available AC inlet can be applied. Further, the joining piece is formed so as to protrude in the width direction on one end side of the ground metal plate, and the constricted portion of the joining piece is fitted in the short direction of the long hole of the ground terminal, so that the joining is performed. It becomes easy to achieve a more stable fitting state, for example, by setting the base portion of the piece larger than the width dimension in the longitudinal direction of the long hole of the ground terminal. For example, the ground terminal can be sandwiched and fixed between the root portion and the head portion of the joining piece. Here, examples of the long hole include a long round shape, an elliptical shape, a rounded square shape, a trapezoidal shape, and a slit shape.

In the present invention, a head is formed on the distal end side of the joining piece, and the width dimension of the head is larger than the width dimension in the short direction of the long hole of the ground terminal and the ground terminal It is characterized by being smaller than the width dimension in the longitudinal direction of the long hole.

According to the present invention, the joint is fitted in the short direction of the long hole of the ground terminal, the head of the joint piece is prevented from coming off, and the joint is further joined. Therefore, the safety ground is a triple connection of fitting, retaining and joining.

The present invention is characterized in that one end side of the ground sheet metal extending from the chassis side is bent into an L shape so as to intersect the ground terminal, and the joining is soldering.

According to the present invention, since one end side of the ground metal plate extending from the chassis side is bent into an L shape so as to intersect the ground terminal, grounding from the ground terminal to the electronic device side is achieved. The routing is compact and lean. Moreover, work becomes easy because the said joining is soldering.

In the present invention, the ground sheet metal and the chassis can be integrally processed. By processing the earth sheet metal integrally with the chassis, the number of parts can be reduced and the space can be saved.

In the present invention, the ground sheet metal and the chassis can be combined and connected and fixed as separate constituent members. According to the present invention, an existing chassis can be applied as it is, and versatility is enhanced. The ground metal plate and the chassis are electrically connected and mechanically coupled by screwing, welding, fitting and brazing, and other known coupling and fixing methods.

In the present invention, the other end side of the ground sheet metal is bent into an L shape so as to overlap the chassis, and a through hole for screwing to the chassis is formed. The side and the chassis are screwed together.

According to the present invention, a safety ground of an existing electronic device can be made a double connection or a triple connection by using the ground metal plate without using a ground lead wire or a faston terminal. Easy to do.

An AC inlet grounding method according to the present invention is a grounding method of an AC inlet for grounding an AC inlet grounding terminal and a chassis, and a ground metal plate having a predetermined shape is used, and the grounding metal plate is connected to one end side of the ground metal plate. A joining piece to be inserted into the hole of the terminal is formed, and a step or constriction is formed on the joining piece for fitting the joining piece with the ground terminal, and the joining piece is inserted into the hole of the ground terminal. And fitting and joining.

According to the present invention, the safety ground is a double connection of fitting and joining by inserting and fitting and joining the joining piece into the hole of the ground terminal. In addition, a joining piece to be inserted into the hole of the ground terminal is formed on one end side of the ground metal plate, and a step or constriction for fitting the joining piece with the ground terminal is formed on the joining piece. As a result, it is possible to stably perform a double connection without using any skill and without using tools. That is, according to the present invention, without using either a grounding lead wire or a faston terminal, the joining piece can be simply inserted into the hole of the grounding terminal, fitted, and joined. Quality is stable.

The joint piece is formed with a constriction for fitting the joint piece, and the joint is brazed, and the joint piece is inserted into the hole of the ground terminal and fitted at the constricted position. It is characterized by being in contact with soldering.

According to the present invention, by fitting at the constricted position, it is easy to pour the molten alloy into a place where the joining piece is fixed to the hole of the ground terminal, and a strong bond is achieved by brazing.

According to the present invention, the hole of the ground terminal is a long hole, and the joining piece formed to protrude in the width direction on one end side of the ground metal plate is inserted into the elongated hole of the ground terminal, and the joining piece is rotated. It moves, It fits in the constriction position of the said joining piece in the transversal direction of the said long hole, It is characterized by the above-mentioned.

According to the present invention, the grounding plate is simply operated by simply inserting the joining piece projecting in the width direction on one end side of the ground metal plate into the long hole of the grounding terminal and rotating the joining piece. The joint piece can be fitted at the constricted position in the short direction of the long hole of the terminal.

In the present invention, a head is formed on the distal end side of the joining piece, and the width dimension of the head is larger than the width dimension in the short direction of the long hole of the ground terminal and the ground terminal It is set smaller than the width dimension of the long hole in the longitudinal direction, the head of the joint piece is inserted into the long hole of the ground terminal, and the joint piece rotates at the constricted position of the joint piece.

According to the present invention, since the ground terminal is sandwiched and fixed between the head portion and the root portion of the joint piece, the head portion of the joint piece is prevented from coming off, and further, a safety ground is obtained by joining. This is a triple connection of fitting, retaining and joining.

In the present invention, one end side of the ground sheet metal is bent into an L shape, the joining piece is inserted into a long hole of the ground terminal, and the joining piece and the grounding terminal intersect with each other. It rotates until it fits in the constricted position of a piece, It is characterized by the above-mentioned.

According to the present invention, the joining piece is inserted into the long hole of the grounding terminal, and is rotated until the joining piece and the grounding terminal intersect with each other at the constricted position of the joining piece. Thus, it is easy to make the fitting force between the two sufficient. The grounding from the ground terminal to the electronic device is a compact and wasteful ground wiring configuration.

The rotation angle for rotating the joining piece to fit the constricted portion of the joining piece in the short direction of the long hole of the ground terminal is preferably 45 degrees or more and 135 degrees or less. When the rotation angle is less than 45 degrees or exceeds 135 degrees, the fitting force becomes weak. The intersection angle between the joining piece and the ground terminal is preferably 70 degrees or more and 110 degrees or less, and more preferably 80 degrees or more and 100 degrees or less. When the crossing angle is approximately 90 degrees, the fitting force is maximized, which is particularly preferable.

In the present invention, the other end side of the ground metal plate is bent into an L shape and a through hole for screwing to the chassis is formed, and the joining piece is fitted in the constricted position. The other end side of the ground metal plate and the chassis are overlapped and screwed.

According to the present invention, by using the ground sheet metal without using a ground lead wire or a faston terminal, it is possible to make a safety ground of an existing electronic device a double connection or a triple connection. Easy to do.

According to the present invention, the joining is soldering, the joining piece is fitted at a constricted position, the other end side of the ground metal plate and the chassis are screwed, and then soldered at the constricted position. It is preferable. According to the present invention, since the soldering is performed, the joining operation becomes relatively easy, and after the screwing, the soldering is performed, so that there is no possibility that an external force is applied at the time of soldering, and stable and high quality joining is achieved.

The ground sheet metal of the present invention has a novel structure different from either the ground lead wire or the faston terminal, and it is easy to insert the ground sheet metal joint piece of the present invention into the hole of the ground terminal and join them together. In a simple operation, the safety ground becomes a double connection of fitting and joining, and the work quality is also stable.

According to the AC inlet grounding structure of the present invention, the joining piece is inserted into the hole of the grounding terminal and fitted and joined, so that the safety ground becomes a double connection of fitting and joining. According to the present invention, neither a grounding lead wire nor a faston terminal is used, and the joining piece is inserted into the hole of the grounding terminal and is simply fitted and joined. Is also stable. According to the present invention, since the joint piece is fitted at the constricted position of the joining piece, the molten alloy spreads over the place where the joining piece is fixed to the hole of the grounding terminal, and is joined by brazing. Become. According to the present invention, a commercially available AC inlet can be applied.

According to the AC inlet grounding method of the present invention, the joining piece formed to protrude in the width direction on one end side of the ground metal plate is simply inserted into the long hole of the grounding terminal, and the joining piece is simply rotated. With a simple operation, the joint piece can be fitted at the constricted position in the short direction of the long hole of the ground terminal. Then, by fixing the grounding terminal so as to be sandwiched between the head portion and the root portion of the joining piece, the head portion of the joining piece is prevented from coming off, and further, by joining, a safety ground is fitted. This is a triple connection between the stopper and the junction. Then, the joint piece is inserted into the long hole of the ground terminal, and rotated until the joint piece and the ground terminal intersect so that the joint piece is fitted at the constricted position of the joint piece. It is easy to make the fitting force sufficient. Then, the grounding from the grounding terminal to the electronic device side becomes a compact and wasteful grounding wiring form, the other end side of the grounding sheet metal and the chassis are screwed, and then soldered at the constricted position. By attaching, there is no fear that an external force is applied during soldering, and stable and high quality bonding is achieved.

It is a perspective view which shows the earthing | grounding structure of AC inlet of the 1st Embodiment of this invention. It is a front view which shows the earth sheet metal for AC inlets concerning the said 1st Embodiment. It is a rear view which shows the earth sheet metal for AC inlets concerning the said 1st Embodiment. It is a side view which shows the earth sheet metal for AC inlets concerning the said 1st Embodiment. It is a top view which shows the earth sheet metal for AC inlets concerning the said 1st Embodiment. It is a top view which shows the assembly | attachment procedure of the earthing | grounding structure of AC inlet of the said 1st Embodiment. It is a top view which shows the assembly | attachment procedure of the earthing | grounding structure of AC inlet of the said 1st Embodiment. It is a top view which shows the assembly | attachment procedure of the earthing | grounding structure of AC inlet of the said 1st Embodiment. It is a side view which shows the assembly | attachment procedure of the earthing | grounding structure of AC inlet of the said 1st Embodiment. It is a side view which shows the assembly | attachment procedure of the earthing | grounding structure of AC inlet of the said 1st Embodiment. It is a figure which shows typically the assembly | attachment procedure of the earthing | grounding structure of AC inlet of the said 1st Embodiment, (a) is a side view, (b) is a front view. It is a figure which shows typically the assembly | attachment procedure of the earthing | grounding structure of AC inlet of the said 1st Embodiment, (a) is a side view, (b) is a front view. It is a figure which shows typically the assembly | attachment procedure of the earthing | grounding structure of AC inlet of the said 1st Embodiment, (a) is a side view, (b) is a front view. It is a figure which shows typically the assembly | attachment procedure of the earthing | grounding structure of AC inlet of the said 1st Embodiment, (a) is a side view, (b) is a front view. It is a perspective view which shows the earthing | grounding structure of AC inlet of the 2nd Embodiment of this invention. It is a front view which shows the earth sheet metal which concerns on the said 2nd Embodiment. It is a rear view which shows the earth sheet metal which concerns on the said 2nd Embodiment. It is a side view which shows the earth sheet metal which concerns on the said 2nd Embodiment. It is a top view which shows the earth sheet metal which concerns on the said 2nd Embodiment. It is a top view which shows the assembly | attachment procedure of the earthing | grounding structure of AC inlet of the said 2nd Embodiment. It is a top view which shows the assembly | attachment procedure of the earthing | grounding structure of AC inlet of the said 2nd Embodiment. It is a top view which shows the assembly | attachment procedure of the earthing | grounding structure of AC inlet of the said 2nd Embodiment. It is a perspective view which shows the earthing | grounding structure of AC inlet of the 3rd Embodiment of this invention. It is a front view which shows the earth sheet metal which concerns on the said 3rd Embodiment. It is a rear view which shows the earth sheet metal which concerns on the said 3rd Embodiment. It is a side view which shows the earth sheet metal which concerns on the said 3rd Embodiment. It is a top view which shows the earth sheet metal which concerns on the said 3rd Embodiment. It is a top view which shows the assembly | attachment procedure of the earthing | grounding structure of AC inlet of the said 3rd Embodiment. It is a top view which shows the assembly | attachment procedure of the earthing | grounding structure of AC inlet of the said 3rd Embodiment. It is a top view which shows the assembly | attachment procedure of the earthing | grounding structure of AC inlet of the said 3rd Embodiment. It is a rear view which shows the assembly | attachment procedure of the earthing | grounding structure of AC inlet of the said 3rd Embodiment. It is a rear view which shows the assembly | attachment procedure of the earthing | grounding structure of AC inlet of the said 3rd Embodiment. It is a perspective view which shows the earthing | grounding structure of AC inlet of the 4th Embodiment of this invention. It is a top view which shows the earthing | grounding structure of AC inlet of the said 4th Embodiment. It is a front view which shows the other example of the earth sheet metal which concerns on the said 3rd Embodiment. It is a rear view which shows the other example of the earth sheet metal which concerns on the said 3rd Embodiment. It is a perspective view which shows the earthing | grounding structure of the conventional AC inlet. It is a figure which shows typically the side surface side of a known chassis. It is a figure which shows the conventional connection structure of a chassis and the lead wire for earth | ground. It is a perspective view which shows the earthing terminal of AC inlet. It is a figure which shows the conventional connection structure of the earthing terminal of AC inlet, and the lead wire for earthing. It is a figure which shows the conventional connection structure of the earthing terminal of AC inlet, and the lead wire for earthing. It is a figure which shows the other example of the conventional connection structure of the earthing terminal of AC inlet, and the earth lead wire. It is a perspective view which shows the other example of the earth sheet metal which concerns on the said 1st Embodiment.

Hereinafter, specific modes for carrying out the present invention will be described with reference to the drawings.

(First embodiment)
FIG. 1 is a perspective view showing a grounding structure of an AC inlet according to a first embodiment to which the present invention is applied.
The AC inlet grounding structure 1 of this embodiment is applied to an electronic device. In the electronic apparatus, an AC inlet 200 is attached to a chassis 100 which is a part of the casing, and the ground terminal 203 and the chassis 100 are grounded by a predetermined ground metal plate 10A (FIG. 1). In order to connect to the ground, the ground metal plate 10A and the chassis 100 have conductivity.

The ground metal plate 10A is made of a known metal material. For example, a ground metal plate 10A is formed by subjecting a conductive metal plate material such as iron, stainless steel, aluminum, brass, or copper to press working or ground metal plate processing. In order to improve conductivity and solderability, the ground metal plate 10A is subjected to known surface treatments such as plating, vapor deposition, sputtering, surface modification treatment, etc., but any metal material with good solderability may be used. If the surface treatment is not required, there is no problem. The ground metal plate 10A is bent into an L shape (FIG. 1 and the like), thereby improving the shape stability and functioning as a leaf spring. The ground metal plate 10A also has a function of protecting an electronic component mounted on the substrate 91 of the electronic device from static electricity by using a shielding effect that suppresses external noise (electrical noise) of the metal material. Similarly, the chassis 100 is made of a known metal material. For example, the chassis 100 is formed by subjecting a conductive metal plate material such as iron, stainless steel, aluminum, brass, or copper to press processing or ground sheet metal processing. In order to improve the conductivity and the like, the chassis 100 is subjected to a known surface treatment such as plating or a surface modification treatment, but there is no particular problem even if the surface treatment is not performed.

A substantially square mounting hole 101 for mounting the AC inlet 200 is formed on the rear side (or front side) of the chassis 100, and a female screw hole 102 for M4 screw is formed on the side surface side of the chassis 100. The circuit board 91 that constitutes a predetermined power circuit is disposed on the lower side of the chassis 100 (FIG. 1). The AC inlet 200 is a commercially available product, and the main body 201 is inserted from the chassis mounting hole 101 with the left and right engaging

portions

211 and 211 closed, and the left and right engaging

portions

211 and 211 are opened to the chassis 100. The fitting is fixed. In the AC inlet 200,

AC power terminals

202 and 204 are attached to the mounting holes of the circuit board 91, fixed, soldered, and connected to a predetermined power circuit (FIG. 1).

As shown in FIG. 40, the ground terminal 203 of the commercially available AC inlet 200 has a so-called lug plate shape and protrudes from the main body 201, and an elliptical long hole 213 is opened at the center thereof. The commercially available ground terminal 203 has a width of 3.5 mm and a length of about 7 mm, and the long hole 213 has a width of 2 mm and a length of about 4 mm.

In the configuration example shown in FIG. 1, the ground terminal 203 of the AC inlet 200 is grounded to the chassis 100 by a ground metal plate 10 A having a predetermined shape so that the ground connection is a safety ground connection. FIG. 2-5 is a diagram showing the ground metal plate 10A of the present embodiment. 2 is a front view showing the ground metal plate 10A, FIG. 3 is a rear view thereof, FIG. 4 is a side view thereof, and FIG. 5 is a plan view thereof.

The ground metal plate 10A of the present embodiment is obtained by punching a plate material having a thickness of about 0.2 mm to 2.0 mm and bending it into an L shape (FIG. 2-5). In the ground metal plate 10A, the main body 11 is bent at an angle of about 90 degrees on one end side to become one end portion 13, and the main body 11 is bent on the other end side at an angle of about 90 degrees in the same direction as described above. (Fig. 2-5). Near the tip of the one end 13 of the ground metal plate 10A, a joining piece 16 is formed to project in the width direction (FIG. 2-3). The joining piece 16 is formed so as to be inserted into the elongated hole 213 of the ground terminal 203, and here, is formed in a direction away from the other end portion 12 of the ground metal plate 10 A. The joint piece 16 has an arm shape, and notches 15 are formed on both sides of the middle of the arm-shaped joint piece 16 to form constrictions 15 and 15 (FIG. 2-3). The constricted portion 15 shown in FIGS. 2 and 3 has a trapezoidal shape at the recessed portion. Examples of the shape of the recessed portion of the constricted portion 15 include a trapezoidal shape, a semicircular shape, a triangular shape, a quadrangular shape, and a pentagonal shape. The constricted portion 15 is formed to fit the joining piece 16 in the short direction of the long hole 213 of the ground terminal 203. A head portion 14 is formed on the distal end side of the joining piece 16 and is formed so that the joining piece 16 does not come out of the ground terminal 203 after the fitting.

In this embodiment, an existing chassis 100 is used, and as shown in FIG. 38, a female screw hole 102 for an M4 screw is formed on the side surface side of the chassis 100. A through hole 19 for an M4 screw is formed near the center of the other end 12 of the ground metal plate 10A (FIG. 4). As shown in FIG. 5, the main body 11 of the ground sheet metal 10 A is bent into an L shape with one end side in front view and bent into an L shape, and is in an L shape with the other end side facing in plan view. The other end 12 is bent. The reason why the ground metal plate 10A has the above L shape is that one end side of the ground metal plate 10A extending from the chassis 100 side intersects the ground terminal 203, and the other end side of the ground metal plate 10A is the chassis 100. This is because it overlaps with.

The procedure for assembling the AC inlet grounding structure of the present embodiment will be described more specifically below. 6-8 is a plan view showing the procedure for assembling the AC inlet grounding structure of the present embodiment. FIG. 9-10 is a side view showing the procedure for assembling the AC inlet grounding structure of the present embodiment. FIGS. 11-14 are diagrams schematically showing a procedure for assembling the AC inlet grounding structure of the present embodiment, in which (a) is a side view and (b) is a front view.

As shown in FIG. 6, when the ground sheet metal 10A is inverted and the chassis 100 is viewed from above, the back side of the ground sheet metal 10A is directed upward, and the joining piece 16 of the ground sheet metal 10A is designated by reference numeral A1. It is moved in the insertion direction and inserted into the elongated hole 213 of the ground terminal 203 (FIGS. 7 and 9). Here, the joining piece 16 has a width dimension W1 of the head portion 14 larger than a width dimension W2 of the constricted portions 15 and 15 (W1> W2), and in the longitudinal direction of the long hole 213 of the ground terminal 203. It is set smaller than the width dimension L1 (W1 <L1) (FIGS. 6, 9, and 11A).

After the joining piece 16 is inserted into the long hole 213 of the ground terminal 203, the other end of the ground metal plate 10 A is viewed when the chassis 100 is viewed from above so that the constricted portion 15 of the joining piece 16 extends over the long hole 213. The ground metal plate 10A is rotated in the rotation direction of C1 so that the portion 12 is on the near side (FIGS. 7, 9, and 12A). Then, the ground metal plate 10A is rotated about 90 degrees in the rotation direction of the reference symbol C1, and the constricted

portions

15 and 15 of the joining piece 16 and the long hole 213 of the ground terminal 203 in the short direction of the long hole 213 (FIGS. 8, 13 (a) and (b)), and the other end 12 of the ground metal plate 10A and the side surface of the chassis 100 are overlapped with each other (FIGS. 8 and 10). Here, the joint piece 16 is set such that the width dimension W2 of the constricted

portions

15 and 15 is equal to or slightly larger than the width dimension L2 in the short direction of the long hole 213 of the ground terminal 203 (W2 ≧ L2) ( FIG. 11 (a), FIG. 13 (a)). Here, the width dimension W 2 of the constricted

portions

15 and 15 is the minimum distance between the

constricted portions

15 and 15. When the constricted

portions

15 and 15 of the joining piece 16 are fitted to the long hole 213 of the ground terminal 203, the constricted

portions

15 and 15 and the long hole 213 are slightly deformed depending on the size of both when fitting. However, the improvement of the fitting force can be expected depending on the deformation method. Since direct electrical connection is obtained by this fitting, connection with low resistance is possible, and a low resistance test that is an essential condition for safety grounding can be satisfied.

The

constrictions

15 and 15 of the joint piece 16 and the elongated hole 213 of the ground terminal 203 are fitted, and then, the M100 screw 500 with a spring washer is used to fasten the chassis 100 and the ground metal plate 10A so as not to loosen. (FIGS. 8 and 10). It can be said that the structure fastened with the M4 screw 500 with the spring washer is a safety ground connection. In the above configuration, the example in which the M4 screw 500 is inserted and screwed into the female screw hole 102 formed in the chassis 100 and the through hole 19 formed in the ground metal plate 10A has been described, but the present invention is not limited to this configuration. Instead, the internal thread hole 102 can be used as a through hole, the through hole 19 can be used as an internal thread hole, and both can be screwed together, or the chassis 100 and the ground metal plate 10A can be fastened using bolts and nuts. In addition to the above, the chassis 100 and the ground metal plate 10A need only be connected and fixed and electrically connected so as not to loosen. Moreover, since it should just be the fastening structure which satisfy | fills a predetermined safety standard, it is not limited to an M4 screw.

Then, after the constricted

portions

15 and 15 of the joining piece 16 and the elongated hole 213 of the ground terminal 203 are fitted, the molten solder 33 is poured into the fitting portion, and the joining piece 16 and the ground terminal 203 are connected. Soldering is performed (FIGS. 14A and 14B). In the present embodiment, soldering between the joining piece 16 and the ground terminal 203 is performed after the screwing. However, if there is no fear that an external force is applied during soldering, the joining piece 16 and the grounding terminal 203 are secured before the screwing. In some cases, soldering is performed.

According to this embodiment, the short side of the long hole 213 of the ground terminal 203 can be obtained by simply inserting the joint piece 16 of the ground metal plate 10A into the long hole 213 of the ground terminal 203 and rotating the joint piece 16. The constricted

portions

15 and 15 of the joining piece 16 are fitted in the direction. Then, the head 14 of the joining piece 16 is prevented from coming off and soldered, so that the safety ground becomes a triple connection of fitting, retaining and soldering. According to the present embodiment, the ground wiring from the ground terminal 203 to the electronic device side has a compact and useless structure.
Further, according to the present embodiment, when the plug of the power cord is inserted into and removed from the AC inlet 200, the ground metal plate 10A functions as a plate spring, so that the stress applied to the joint portion between the ground terminal 203 and the ground metal plate 10A is It is possible to escape.
Further, as shapes other than the ground metal plate 10A, as shown in FIG. 44, a locking portion 11A extending vertically from the central portion of the main body 11 and a locking portion 11B extending vertically from the one end portion 13 of the main body 11 are provided. Alternatively, the ground sheet metal 10F may be provided.
By adopting such a shape, the back surface 201A of the AC inlet 200 comes into contact with the engaging portions 11A and 11B of the ground metal plate 10F during assembly, and the ground terminal 203 of the AC inlet 200 and the head 14 of the ground metal plate 10F The positional relationship is regulated. Thereby, the edge surface distance on the safety standard of the earth sheet metal 10F and the terminal 202 of AC inlet 200 is securable. In addition, although the two locking portions 11A and 11B of the ground metal plate 10F are provided, only one of them may be provided.

(Second Embodiment)
FIG. 15 is a perspective view showing a grounding structure of an AC inlet according to the second embodiment to which the present invention is applied. Here, the same reference numerals represent the same functions, and description thereof will be omitted as appropriate. In the second embodiment, the direction of the arm-shaped joining piece 16 of the ground metal plate 10A in the first embodiment is opposite to the left and right when viewed from the front side (FIGS. 2 and 16). In the second embodiment, in order to make the above ground connection a safety ground connection, in the configuration example shown in FIG. 15, the ground terminal 203 of the AC inlet 200 is formed by a ground metal plate 10B (ground metal plate 10) having a predetermined shape. The chassis 100 is grounded. FIG. 16-19 is a view showing the ground metal plate 10B of the present embodiment. 16 is a front view showing the ground metal plate 10B, FIG. 17 is a rear view thereof, FIG. 18 is a side view thereof, and FIG. 19 is a plan view thereof.

In the ground metal plate 10B of the present embodiment, the main body 11 is bent at an angle of about 90 degrees on one end side to become one end portion 13, and the main body 11 is bent on the other end side at an angle of about 90 degrees in the same direction as described above. The other end 12 is formed (FIGS. 16-19). Near the tip of the one end portion 13 of the ground metal plate 10B, a joining piece 16 is formed protruding in the width direction, and here, it is formed in a direction approaching the other end portion 12 of the ground metal plate 10B. The joint piece 16 has an arm shape, and

constrictions

15 and 15 are formed on both sides in the middle of the arm-shaped joint piece 16 (FIGS. 16-19). Then, one end 13 of the ground metal plate 10B is extended so as to face the arm-shaped joining piece 16 to form a narrow portion 132, and a slit is formed by the joining piece 16 and the narrow portion 132 (FIG. 16). -17). The slit shape formed of the joining piece 16 and the narrow width portion 132 is to prevent the joining piece 16 from coming off from the slot 213 once inserted into the elongated hole 213 of the ground terminal 203. It is devised so that does not fall. In addition, when soldering, not only the joining piece 16 but also the narrow width portion 132 is soldered to increase the soldering strength.

The assembly procedure of the AC inlet grounding structure of the present embodiment is the same as the assembly procedure of the first embodiment described above. FIG. 20-22 is a plan view showing the procedure for assembling the AC inlet grounding structure of the present embodiment.

As shown in FIGS. 20 to 21, the ground sheet metal 10 B is inverted so that when the chassis 100 is viewed from above, the back side of the ground sheet metal 10 B is facing upward, B1 is moved in the insertion direction, and the elongated hole 213 of the ground terminal 203 is passed through the slit formed by the joining piece 16 and the narrow width portion 132, and then moved in the insertion direction of the symbol A2, and the joining piece 16 is grounded. It inserts in the long hole 213 of the terminal 203 (FIG. 20, FIG. 21).

After the joining piece 16 is inserted into the long hole 213 of the ground terminal 203, the other end of the ground metal plate 10 B is seen when the chassis 100 is viewed from the top so that the constricted portion 15 of the joining piece 16 is related to the long hole 213. The ground metal plate 10B is rotated about 90 degrees in the rotation direction of the reference C1 so that the portion 12 is on the near side, and the constricted

portions

15 and 15 of the joining piece 16 in the short direction of the long hole 213 The long hole 213 is fitted (FIGS. 21 and 22), and the other end portion 12 of the ground metal plate 10B and the side surface side of the chassis 100 are overlapped with each other, and an M4 screw 500 with a spring washer is used. The chassis 100 and the ground metal plate 10B are fastened so as not to loosen (FIG. 22).

Then, after the constricted

portions

15 and 15 of the joining piece 16 and the elongated hole 213 of the ground terminal 203 are fitted, the molten solder 33 is poured into a place including the fitting place, and the joining piece 16 and the ground are grounded. The terminal 203 is soldered (FIG. 15).

According to the present embodiment, the short side of the long hole 213 of the ground terminal 203 can be obtained simply by inserting the joint piece 16 of the ground metal plate 10B into the long hole 213 of the ground terminal 203 and rotating the joint piece 16. The constricted

portions

15 and 15 of the joining piece 16 are fitted in the direction. Then, the head 14 of the joining piece 16 is prevented from coming off and soldered, so that the safety ground becomes a triple connection of fitting, retaining and soldering. The slit shape composed of the joining piece 16 and the narrow width portion 132 is difficult to be detached from the joining piece 16 once it is inserted into the long hole 213 of the ground terminal 203. Since not only the piece 16 but also the narrow portion 132 is soldered, the soldering strength can be further increased, and high-quality soldering work can be stably and easily performed.

(Third embodiment)
FIG. 23 is a perspective view showing a grounding structure of an AC inlet according to a third embodiment to which the present invention is applied. Here, the same reference numerals represent the same functions, and description thereof will be omitted as appropriate. In the third embodiment, in order to use the above-described ground connection as a safety ground connection, in the configuration example shown in FIG. 23, the ground terminal 203 of the AC inlet 200 is connected to the chassis 100 by the ground metal plate 10C having a predetermined shape. Has been. 24-27 is a diagram showing the ground metal plate 10C of the present embodiment. 24 is a front view showing the ground metal plate 10C, FIG. 25 is a rear view thereof, FIG. 26 is a side view thereof, and FIG. 27 is a plan view thereof.

In the ground metal plate 10C of this embodiment, the main body 11 is bent at an angle of about 90 degrees on one end side to become one end portion 13, and the main body 11 is bent on the other end side at an angle of about 90 degrees in the same direction as described above. The other end 12 is formed (FIGS. 24-27). Near the tip of one end portion 13 of the ground metal plate 10C, a joining piece 16 is formed projecting in the width direction. The joining piece 16 is surrounded by one end 13 of the ground metal plate 10C. Thus, the current resistance value of the ground metal plate 10C is increased while protecting the joining piece 16. Further, since the joining piece 16 is surrounded by the one end portion 13 of the ground metal plate 10C, there is also an effect that the ground terminal 203 of the AC inlet 200 is not displaced outside from the enclosed range. The joining piece 16 has an arm shape, and narrow portions 17 and 17 (narrow portions 171 and 172) are formed on both sides in the middle of the arm-shaped joining piece 16 (FIGS. 24-27). A head 141 is formed on the distal end side of the joining piece 16. In the present embodiment, the head 141 and the

narrow portions

171 and 172 are formed so as to be shifted upward in the front view of FIG. 24 and the rear view of FIG. Then, the portion 171 is not constricted and is connected straight to the root (reference 18), and the constriction becomes large at the portion 172, resulting in a step 173 leading to the root (reference 18) (FIG. 24). -25). The rising from the portion indicated by reference numeral 171 to the head portion 141 is steep, and the corner portion indicated by reference numeral 142 is sharp and easily hooked. The joining piece 16 has a claw shape near the corner portion 142 of the head 141, and this claw shape makes it difficult to come off after the joining piece 16 is inserted into the elongated hole 213 of the ground terminal 203.

As shown in FIG. 27, the main body 11 of the ground metal plate 10C is bent into an L-shape with one end side in the front view and bent into an L-shaped portion 13 and is formed in an L-shape with the other end side facing in the plan view. The other end 12 is bent. The reason why the ground sheet metal 10C has the L shape is that one end side of the ground sheet metal 10C extending from the chassis 100 side intersects the ground terminal 203 and the other end side of the ground sheet metal 10C is the chassis 100. This is because it overlaps with.

As shapes other than the above-described ground metal plate 10C, for example, if the current resistance value and other necessary quality standards are satisfied, the joining piece 16 is not surrounded by the one end portion 13 of the ground metal plate 10E as shown in FIGS. The ground metal plate 10E having a narrow width may be used.

The procedure for assembling the AC inlet grounding structure of the present embodiment will be described more specifically below. 28-30 is a plan view showing the procedure for assembling the AC inlet grounding structure of the present embodiment. FIG. FIGS. 31-32 are rear views showing the procedure for assembling the AC inlet grounding structure in an enlarged manner according to the present embodiment.

As shown in FIG. 28, the AC inlet 201 is partly assembled in the chassis 100, and as shown in FIG. 31, the head 141 of the joining piece 16 of the ground metal plate 10C is inserted into the long hole 213 of the ground terminal 203. To do. Then, the chassis 100 and the ground metal plate 10C are fastened using an M4 screw 500 with a spring washer so as not to loosen. When the chassis 100 is viewed from above, the main body 201 of the AC inlet 200 is fitted and fitted to the chassis 100 on the side close to the ground metal plate 10C among the left and right engaging

portions

211 and 211 of the main body. The side away from the sheet metal 10C is not incorporated in the chassis 100 (see FIGS. 1 and 28). In addition to the above, for example, before the AC inlet 201 is incorporated into the chassis 100, the chassis 100 and the ground metal plate 10C are fastened, and the AC inlet 201 is incorporated into the chassis 100 halfway. As shown, the head 141 of the joining piece 16 of the ground metal plate 10 C may be inserted into the long hole 213 of the ground terminal 203. Here, it can be said that the structure fastened with the M4 screw 500 with the spring washer is a connection of safety ground. In addition, it is not limited to an M4 screw.

The head 141 of the joint piece 16 is inserted into the elongated hole 213 of the ground terminal 203, and then in the main body 201 of the AC inlet 200, the main body 201 left and right of the main body left and right engaging

portions

211 and 211 are separated from the ground metal plate 10C. When the existing side is assembled and fitted into the chassis 100, the main body 201 moves in the direction of reference D1, while the ground terminal 203 moves in the direction of reference D1 (FIG. 29). In plan view, reference numeral D1 rotates clockwise. This is because the main body 201 of the AC inlet 200 is tilted as shown in FIG. This corresponds to the amount of movement until it is assembled into the chassis 100, and is a slight amount of movement (rotation amount).

The operation in which the ground terminal 203 moves (rotates) in the direction of reference D1 shown in FIG. 29 will be described in detail. As shown in FIG. 31, the ground terminal 203 moves in the direction of reference A3, and the joined piece of the ground metal plate 10C. The ground terminal 203 is moved in the direction of reference B2 while moving in the direction of reference A3 beyond the step 173 of FIG. 16 (FIG. 32), and the

base portions

18 and 18 of the joining piece 16 and the ground terminal 203 are moved. The long hole 213 is fitted (FIGS. 30 and 32). The joint piece 16 is set such that the width dimension W5 of the

base portions

18 and 18 is equal to or slightly larger than the width dimension L2 in the short direction of the long hole 213 of the ground terminal 203 (W5 ≧ L2) (FIG. 31, FIG. 31). FIG. 32). Here, the

root portions

18 and 18 are intervals between positions that are wide beyond the lines of the

upper sides

171 and 172 of the steps. When the

base portions

18 and 18 of the joint piece 16 and the elongated hole 213 of the ground terminal 203 are fitted, the

root portions

18 and 18 and the elongated hole 213 are slightly deformed depending on the size of both when fitting. However, the improvement of the fitting force can be expected depending on the deformation method. Here, the joint piece 16 has a width dimension W4 of the head portion 14 smaller than a width dimension W5 of the root portions 18 and 18 (W4 <W5), and the short direction of the long hole 213 of the ground terminal 203 Is set smaller than the width dimension L2 (W4 <L2) (FIGS. 31, 32, and 25). And the width dimension W4 of the head 14 of the joining piece 16 is set larger than the width dimension W3 of the

narrow width parts

17 and 17 of the joining piece 16 (W4> W3) (FIG. 31, FIG. 32, FIG. 25). .

The joint piece 16 has a claw shape near the corner portion 142 of the head 141. With this claw shape, when the joint piece 16 is inserted into the long hole 213 of the ground terminal 203, it is difficult to be detached ( FIG. 32).

Then, after fitting the

base portions

18 and 18 of the joining piece 16 and the elongated hole 213 of the ground terminal 203, the molten solder 33 is poured into the fitting portion to connect the joining piece 16 and the ground terminal 203. Soldering is performed (FIG. 23).

According to the present embodiment, the AC inlet 200 is partially assembled into the chassis 100, and the joining piece 16 of the ground metal plate 10C (or the ground metal plate 10E) is inserted into the hole 213 of the ground terminal 203, and the AC inlet 200 is installed in the chassis. The

base portions

18 and 18 of the joining piece 16 are fitted in the short direction of the long hole 213 of the ground terminal 203 by a simple operation that is simply incorporated into the ground terminal 203. And the head 141 of the joining piece 16 is hooked in the vicinity of the claw-shaped corner 142 to prevent it from coming off, and by soldering, the safety ground becomes a triple connection of fitting, retaining and soldering. According to the present embodiment, the ground wiring from the ground terminal 203 to the electronic device side has a compact and useless structure.

(Fourth embodiment)
FIG. 33 is a perspective view showing a grounding structure of an AC inlet according to a fourth embodiment to which the present invention is applied. Here, the same reference numerals represent the same functions, and description thereof will be omitted as appropriate. In the fourth embodiment, the ground metal plate 10C (or the ground metal plate 10E) in the third embodiment and the chassis 100 are integrally processed, so that screwing by the screw 500 is eliminated. In the fourth embodiment, in the configuration example shown in FIGS. 33 and 34, the ground terminal 203 of the AC inlet 200 is grounded to the chassis 110 including the ground metal plate 10D having a predetermined shape. By using the chassis 110 provided with the ground metal plate 10D, the screw 500 is not necessary, so that the number of parts can be reduced and further space saving is achieved.

In the first embodiment and the second embodiment described above, the hole shape of the ground terminal 203 of the AC inlet 200 is set such that the width dimension L1 is larger than the width dimension L2, as shown in FIGS. As long as the shape is not limited to the long hole 213, the shape can be appropriately set by setting the shape and size of the joining piece 16. Further, in the third embodiment and the fourth embodiment described above, the hole shape of the ground terminal 203 of the AC inlet 200 is not limited to the long hole 213, but is a round hole, a triangular hole, a square hole, a pentagonal hole, a hexagonal hole. It can be a hole or any other shape.

As described above, the present invention is not limited to the embodiment described above. For example, in the first to fourth embodiments described above, the joining is described as soldering 33, but the joining is not limited to soldering, but brazing, thermocompression bonding, and electrical conduction. Adhesion with an adhesive is possible. By the joining, the joining piece 16 of the

ground metal plate

10A, 10B, 10C, 10D or 10E and the ground terminal 203 of the AC inlet 200 are electrically connected and mechanically joined. Further, for example, in the first to third embodiments described above, the

earth sheet metal

10A, 10B, 10C or 10E has been described as having two L-shaped bends. The bending is not limited to two L-shaped bendings, but may be one L-shaped bending or a plurality of bendings. Thus, it goes without saying that the present invention can be modified as appropriate without departing from the spirit of the present invention.
Needless to say, the locking portions 11A and 11B of the ground metal plate 10F are also applicable to the second to fourth embodiments.

1 AC inlet grounding structure of the present invention,
10A, 10B, 10C, 10D, 10E, 10F Earth sheet metal according to the present invention,
11 Earth sheet metal body,
14, 141 head of the joint piece,
15 Constriction (constriction part, notch),
16 joint pieces,
173 steps,
33 Soldering (solder, brazing, joining)
100 chassis,
200 AC inlet

Claims

A grounding sheet metal for AC inlet for grounding the grounding terminal of the AC inlet and the chassis, and a joining piece to be inserted into the hole of the grounding terminal is formed on one end side of the grounding sheet, The joint piece is formed with a step or constriction for fitting with the ground terminal, and the joint piece is inserted into the hole of the ground terminal and fitted to be joined. sheet metal.
The joint piece is formed with a constriction for fitting with the ground terminal, and a head portion is formed on the distal end side of the joint piece. 2. The earth sheet metal for an AC inlet according to claim 1, wherein the width of the long hole is larger than the width of the long hole in the short direction and smaller than the width of the long hole of the ground terminal in the long direction.
The one end side where the said joining piece is formed is bent by the L-shape in the direction which cross | intersects the said grounding terminal when it extends from the said chassis side, The Claim 1 or 2 characterized by the above-mentioned. Earth sheet metal for AC inlet.
When one end side where the joining piece is formed is extended from the chassis side, the other end side of the ground metal plate is bent into an L shape in a direction overlapping the chassis, and other than the ground metal plate 4. The grounding sheet metal for an AC inlet according to claim 1, wherein a through hole for screwing to the chassis is formed on an end side. 5.
A grounding structure of an AC inlet in which a ground terminal of an AC inlet and a chassis are grounded, a ground metal plate having a predetermined shape is used, and a joining piece to be inserted into a hole of the ground terminal is provided on one end side of the ground metal plate. The joint piece is formed with a step or a constriction for fitting the joint piece with the ground terminal, and the joint piece is inserted into the hole of the ground terminal and joined to be joined. An AC inlet grounding structure characterized by the above.
The joint piece is formed with a constriction for fitting the joint piece, and the joint is brazed, and the joint piece is inserted into the hole of the ground terminal and is fitted at the constricted position. The AC inlet grounding structure according to claim 5, wherein the AC inlet is grounded.
The hole of the ground terminal is a long hole, and the joining piece is formed to protrude in the width direction on one end side of the ground metal plate, and the joining piece is in the short direction of the long hole of the ground terminal. 7. The AC inlet grounding structure according to claim 5, wherein the AC inlet is grounded.
A head is formed on the distal end side of the joining piece, the width of the head is larger than the width of the long hole of the ground terminal in the short direction, and the length of the long hole of the ground terminal. The AC inlet grounding structure according to claim 7, wherein the grounding structure is smaller than a width dimension in a longitudinal direction.
9. The ground plate extended from the chassis side is bent into an L shape in a direction crossing the ground terminal, and the joining is soldering. An AC inlet grounding structure according to any one of the preceding claims.
The other end side of the ground metal plate is bent into an L shape in a direction overlapping the chassis, and a through hole for screwing to the chassis is formed, and the other end side of the ground metal plate and the chassis The AC inlet grounding structure according to any one of claims 5 to 9, characterized in that is screwed.
An AC inlet grounding method for grounding an AC inlet grounding terminal and a chassis, wherein a grounding metal plate having a predetermined shape is used, and a joining piece to be inserted into a hole of the grounding terminal is formed on one end side of the grounding metal plate. The joining piece has a step or constriction for fitting the joining piece with the ground terminal, and the joining piece is inserted into the hole of the ground terminal to be joined and joined. AC inlet grounding method.
The joint piece is formed with a constriction for fitting the joint piece, and the joint is brazed, and the joint piece is inserted into the hole of the ground terminal and fitted at the constricted position. 12. The method for grounding an AC inlet according to claim 11, wherein the contact is brazed.
The hole of the ground terminal is a long hole, the joint piece formed to protrude in the width direction on one end side of the ground metal plate is inserted into the long hole of the ground terminal, the joint piece is rotated, The AC inlet grounding method according to claim 12, wherein fitting is performed at a constricted position of the joining piece in a short direction of the long hole.
A head is formed on the distal end side of the joining piece, the width of the head is larger than the width of the long hole of the ground terminal in the short direction, and the length of the long hole of the ground terminal. 14. The AC according to claim 13, wherein the width is set to be smaller than a width dimension in a longitudinal direction, the head of the joint piece is inserted into a long hole of the ground terminal, and the joint piece is rotated at a constricted position of the joint piece. How to ground the inlet.
One end side of the ground metal plate is bent into an L shape, the joint piece is inserted into a long hole of the ground terminal, and the constriction position of the joint piece is such that the joint piece and the ground terminal intersect each other. The method for grounding an AC inlet according to claim 13, wherein the AC inlet is rotated until it is fitted.
The other end side of the ground metal plate is bent into an L shape, and a through hole for screwing to the chassis is formed. After the joining piece is fitted in a constricted position, the ground metal plate is The method for grounding an AC inlet according to any one of claims 11 to 15, wherein the other end side and the chassis are overlapped and screwed together.
The joining is soldering, the joining piece is fitted in a constricted position, the other end side of the ground metal plate and the chassis are screwed, and then soldered in the constricted position. The method for grounding an AC inlet according to claim 16.