JP5818632B2 - Ground coil fixing structure and equipment using the same - Google Patents

Description

  The present invention relates to a grounding coil fixing structure and a device using the same.

  In general, in equipment that requires ground connection, double or reinforced insulation is applied to the accessible conductive part, or the accessible conductive part is connected to the ground of the power plug by the internal wiring of the equipment. To protect. A touchable conductive part is a metal part that can be touched by a person. According to the IEC (International Electrotechnical Commission) standard, “a part or surface that can be touched by a test probe (a test finger assuming a human finger)” It is defined as In addition, the ground coil reduces noise components generated on the internal wiring from the grounded accessible conductive part to the power plug, and noise components entering from the outside of the device through the ground of the power plug. Equipment exists.

  This grounding coil for noise suppression is conventionally connected in the middle of the internal wiring of the earth connected to the accessible conductive part, and it is arranged inside the equipment without being completely fixed, or electrical parts are not A track (pattern) serving as a ground is formed on the mounted substrate, and a ground coil is connected to the substrate (see, for example, Patent Document 1).

Japanese Patent Laid-Open No. 02-155109 (FIGS. 1 and 4)

  However, in the case where the earth coil is arranged in the apparatus without being completely fixed by connecting the earth coil in the middle of the earth internal wiring, the insulating material for insulating the winding of the earth coil from the charged part etc. (For example, an insulating tape or the like) is required. In order to solve this problem, it is sufficient to secure a space in order to add a structure for fixing the ground coil. However, it may be difficult to secure this space depending on the device.

  In addition, in the case where a ground track (pattern) is formed on a substrate and a ground coil is connected to the substrate, the substrate is placed on the substrate in order to comply with the IEC (International Electrotechnical Commission) standard. In addition, it is necessary to form at least two tracks (patterns) to be grounded as independent soldering points. Therefore, it is necessary to take measures such as dividing the lead of the ground coil into at least two and mounting it on the board. However, it is difficult to divide the lead of the ground coil into at least two, It may be difficult to implement due to problems.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to enable a grounding coil to be fixed on a substrate even when a track (pattern) serving as a ground is not formed on the substrate. And

Fixing structure of the earth coil according to the present invention includes a ground coil connected to the middle of the ground internal wiring accessible conductive portions of the device, engaging holes are formed, a substrate on which electrical components are mounted, the A Sukoiru holds, comprising a spacer for mechanically securing the a Sukoiru on the substrate, the spacer is provided with a pedestal portion for holding the ground coils in the upper, ground coil in a state of being floated predetermined distance from the plate surface of the substrate A cylindrical portion to be held, and a locking claw that projects downward from the lower end portion of the cylindrical portion from the pedestal portion in the cylindrical portion and engages with an edge of an engagement hole formed in the substrate. A vent hole communicating with the engagement hole is provided.

In the ground coil fixing structure of the present invention, even if a track (pattern) serving as the ground of the accessible conductive portion of the device is not formed on the substrate, the ground coil has a locking claw that can be engaged with the substrate and is grounded. The ground coil can be fixed on the substrate using a spacer for holding the coil. For this reason, an insulating material (for example, insulating tape, etc.) is used to insulate from a charged part or the like that is necessary when an earth coil is connected in the middle of the earth internal wiring and placed inside the device without being completely fixed. Can be made unnecessary. In addition, it is easy to secure an installation space for the ground coil, and an efficient arrangement can be achieved in a limited space.
In addition, the spacer includes a pedestal portion that holds the ground coil at the top, a cylindrical portion that holds the ground coil in a state of floating a predetermined distance from the plate surface of the substrate, and a lower end portion of the cylindrical portion from the pedestal portion in the cylindrical portion. A locking claw that protrudes downward and engages with an edge of an engagement hole formed in the substrate, and the pedestal portion includes a vent hole that communicates with the engagement hole of the substrate. The generated heat of the earth coil at the time of occurrence can be cooled by the air passing through the vent hole, and the heat dissipation performance is improved.

It is a connection diagram of the apparatus (rice cooker) provided with the fixing structure of the earth coil which concerns on embodiment of this invention. It is a perspective view which shows the fixation structure of the earth coil which concerns on embodiment of this invention. It is a longitudinal cross-sectional view which shows the fixing structure of the earth coil which concerns on embodiment of this invention. It is a longitudinal cross-sectional view which shows the fixation structure of the earth coil which concerns on embodiment of this invention from the angle different from FIG. It is the perspective view which looked at the spacer used for the fixation structure of the earth coil which concerns on embodiment of this invention from the latching claw side. It is a bottom view of the spacer used for the fixing structure of the earth coil which concerns on embodiment of this invention. It is a top view of the spacer used for the fixation structure of the earth coil which concerns on embodiment of this invention.

FIG. 1 is a connection diagram of a device (rice cooker) having a ground coil fixing structure according to an embodiment of the present invention, FIG. 2 is a perspective view showing a ground coil fixing structure according to an embodiment of the present invention, and FIG. FIG. 4 is a longitudinal sectional view showing a ground coil fixing structure according to an embodiment of the present invention, and FIG. 4 is a longitudinal sectional view showing the ground coil fixing structure according to the embodiment of the present invention from an angle different from FIG.
The ground coil fixing structure according to the embodiment of the present invention uses the ground coil 2 and the spacer 3 even if a track (pattern) serving as a ground is not formed on the substrate 1 as shown in FIGS. It can be fixed mechanically. Electrical components including electronic components are mounted on the substrate 1.

  In other words, the ground coil 2 is provided mainly for noise suppression of a device having a touchable conductive part, for example, a rice cooker 10. The touchable conductive portion is a metal portion that can be touched by a person as described above. In the rice cooker 10, the body heater portion 4 for heating the inner pot from the side surface and the inner pot for heating from the upper surface. The lid heater part 5 becomes the accessible conductive part. Accordingly, the internal ground wires 6 and 7 are connected to the body heater unit 4 and the lid heater unit 5, respectively. These internal ground wires 6 and 7 are combined into a single ground internal wire 9 by the binding unit 8, It is connected to the ground 12 of the plug 11. A ground coil 2 is connected in the middle of a single ground internal wiring 9, and noise components generated on the internal wiring from the grounded body heater section 4 and lid heater section 5 to the power plug. In addition, the ground coil 2 can reduce noise components that enter from the outside of the device through the ground of the power plug. A main power line 13 of the power plug 11 is connected to the substrate 1.

  The spacer 3 holds the ground coil 2 and mechanically fixes the ground coil 2 on the substrate 1 as shown in FIGS. 3 and 4. The ground coil 2 is fixed to the substrate 1 from the plate surface. A cylindrical portion 31 for securing a gap for holding in a floating state, a pedestal portion 32 on which the ground coil 2 is placed and held, and an inner side of the cylindrical portion 31 and below the cylindrical portion 31 And a latching claw 34 that can be engaged with an edge of an engagement hole 33 formed in the substrate 1.

Next, details of the spacer 3 and details of the connecting portion between the ground internal wiring 9 and the lead wire of the ground coil 2 will be described with reference to FIGS. 1 to 4 using FIGS. FIG. 5 is a perspective view of the spacer used in the ground coil fixing structure according to the embodiment of the present invention as seen from the side of the locking claw, and FIG. 6 is a bottom view of the spacer used in the ground coil fixing structure according to the embodiment of the present invention. FIG. 7 is a top view of the spacer used in the ground coil fixing structure according to the embodiment of the present invention.
As shown in FIGS. 3, 4, 5, and 7, the spacer 3 is formed with a peripheral wall 35 that covers a part of the outer side surface of the ground coil 2 on the pedestal portion 32. Thus, the workability at the time of mounting the ground coil 2 on the substrate 1 can be improved. The peripheral wall 35 also has a function of preventing contact between the other components on the substrate 1 and the earth coil 2 and protecting the insulating film of the earth coil 2. Thereby, the reliability of the earth coil 2 can be improved.

  Further, the spacer 3 is formed with a notch 36 in the vicinity of the lead portion of the lead wire 21 of the earth coil 2. The lead wire 21 of the earth coil 2 and the earth internal wiring 9 are located at a notch 36 portion between the substrate 1 and the earth coil 2, that is, at a position lower than the core of the earth coil 2 (position closer to the plate surface of the substrate 1). It is connected by the fixing terminal 22 at the position of the notch 36 part. As a result, it is possible to prevent the fixing terminal 22 from interfering with the spacer 3 and the core of the earth coil 2 and to prevent the wiring from being damaged by the edge of the spacer 3 and the coil insulating film from being damaged by the fixing terminal 22. ing. Then, the ground coil 2 connected to the ground internal wiring 9 can be mounted on the substrate 1 by the spacer 3. This eliminates the need for an insulating material (for example, an insulating tape) for insulating the winding of the earth coil 2 from the charged part. In addition, it is easy to secure an installation space for the ground coil 2, and an efficient arrangement can be made in a limited space.

  Further, the end of the lead wire 21 of the earth coil 2 penetrating the fixing terminal 22 is extended and inserted into a soldering hole 37 formed in the substrate 1 as shown in FIG. That is, the ground coil 2 is temporarily fixed to the substrate 1 by the locking claws 34 of the spacer 3 that holds the ground coil 2 and is permanently fixed to the substrate 1 by soldering the end of the lead wire 21. In this manner, by using the locking claw 34 of the spacer 3, temporary fixing until the ground coil 2 and the substrate 1 are soldered can be performed, so that the assembly workability is improved. Further, the lead wire 21 of the ground coil 2 is arranged in the notch 36 of the spacer 3, and the extending portion of the lead wire 21 extends straight from there, so that the lead to the soldering hole 37 of the substrate 1 is provided. The insertability of the line 21 is improved.

  Further, the spacer 3 and the earth coil 2 are fixed to each other with an adhesive (not shown) (for example, silicon), thereby improving workability when the earth coil 2 is mounted on the substrate 1. Further, the friction between the spacer 3 and the earth coil 2 is eliminated, the damage of the insulating material of the earth coil 2 by the spacer 3 is prevented, and the stress on the solder part due to vibration or the like is further reduced.

  Further, as shown in FIGS. 5 to 7, the spacer 3 is formed with a vent hole 38 on at least the surface that holds the ground coil 2, that is, the pedestal portion 32. Thereby, the heat generation of the ground coil 2 when noise is generated during operation can be cooled by the air passing through the vent hole 38, and the heat dissipation performance is improved.

  It is desirable to provide an insulating material (not shown) in the gap between the fixing terminal 22 and the core of the earth coil 2. Thereby, damage to the coil insulating film by the fixing terminal 22 can be reliably prevented.

  As described above, according to the present invention, even if the track (pattern) serving as the ground of the accessible conductive portion of the rice cooker 10 is not formed on the substrate 1, the ground coil 2 is used as the substrate using the spacer 3. 1 could be implemented. For this reason, an insulating material (for example, an insulating material) is used to insulate the ground coil from the live part, etc., which is necessary when the ground coil is connected in the middle of the ground wiring of the equipment and placed inside the equipment without being completely fixed. Tape etc.) can be dispensed with. In addition, the installation space for the earth coil 2 can be easily secured, and the arrangement can be efficiently performed in the limited space.

  In addition, although the rice cooker 10 was mentioned as an example and applied here as an application apparatus of this invention, this invention is not restricted to this, For example, it applies to all the apparatuses which require a ground connection, such as an electromagnetic induction heating cooking appliance. It goes without saying that it is possible.

  1 substrate, 2 ground coil, 3 spacer, 4 body heater part (touchable conductive part), 5 lid heater part (touchable conductive part), 6, 7, 9 ground internal wiring, 8 binding part, 10 rice cooker (equipment) ), 11 power plug, 12 power plug ground, 13 power line, 21 ground coil lead wire, 22 fixing terminal, 31 cylinder, 32 pedestal, 33 engagement hole, 34 locking claw, 35 pedestal Peripheral wall, 36 notches, 37 soldering holes, 38 vent holes.

Claims (8)

A ground coil connected in the middle of the ground internal wiring of the accessible conductive part of the device;
A substrate on which an engagement hole is formed and an electrical component is mounted;
It holds the previous SL ground coil, a spacer for mechanically securing the pre-Symbol ground coil on the substrate,
Equipped with a,
The spacer is
A pedestal portion for holding the ground coil at the top, and a cylindrical portion for holding the ground coil in a state of floating a predetermined distance from the plate surface of the substrate;
A locking claw that projects downward from the lower end portion of the cylindrical portion from the pedestal portion in the cylindrical portion, and engages with an edge of the engagement hole formed in the substrate,
With
The grounding coil fixing structure , wherein the pedestal portion includes a vent hole communicating with the engagement hole of the substrate . Between the ground coil and the substrate that has been Ukasa by the tubular portion of the spacer, according to claim 1, wherein said grounding internal wiring and the lead wire of the ground coil is characterized in that it is connected in a fixed terminal Earth coil fixing structure. 3. The ground coil fixing structure according to claim 2 , wherein an end of a lead wire of the earth coil penetrating the fixing terminal is inserted into a hole formed in the substrate and soldered. The ground coil fixing structure according to any one of claims 1 to 3 , wherein the spacer covers at least a part of a side surface portion of the outer shell of the ground coil. The spacer is fixed structure of the ground coil according to any one of claims 1-4, characterized in that it is notch formed near the lead portion of the lead wire of the ground coil. The structure for fixing an earth coil according to any one of claims 1 to 5 , wherein the spacer and the earth coil are fixed to each other with an adhesive. The ground coil fixing structure according to any one of claims 2 to 6 , wherein an insulating material is provided in a gap between the fixing terminal and the ground coil. An apparatus comprising the ground coil fixing structure according to any one of claims 1 to 7 .

Images