JP3195884B2 - microwave - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a microwave oven provided with a ground inductor type noise filter.

[0002]

2. Description of the Related Art In a microwave oven, a ground terminal is generally provided on a rear surface portion of an outer wall portion of a microwave oven, and an external ground wire is connected to the ground terminal when the microwave oven is installed. I have to. Also, in a microwave oven, noise generated in an internal electric circuit propagates through a power supply line to an external AC power supply side and may adversely affect other electric devices. A filter is provided. In this case, for example, in a microwave oven employing a ground inductor type noise filter, an inductance element constituting a part of the noise filter is connected between the ground terminal and an outer wall portion of the range main body, that is, a metal plate portion.

In this configuration, since it is necessary to insulate the inductance element from the metal plate portion of the range main body, a holder made of an insulating material is attached to the outer wall of the range main body, and the holder is configured to hold the inductance element. ing. Such an earth structure is shown in FIG. This figure 1
In 3, an insulating plastic holder 1 for holding an inductance element is attached to a rear plate 2 which is a metal plate portion of the range main body. The holder 1 has a through hole 3 formed therein, and a hexagonal nut 4 is accommodated in a hexagonal large-diameter portion 3 a formed outside the through hole 3. A long screw 5 is inserted from the inside into the through hole 3 via a spring seat 6 and is fastened to the hexagon nut 4. In this case, the connection terminal 7a provided at the end of one of the lead wires 7 led from the winding of the inductance element is sandwiched between the head 5a of the long screw 5 and the spring seat 6 so as to be sandwiched. It is configured.

On the other hand, the tip of the long screw 5 is
, And is projected rearward, and is configured to connect a connection terminal 8 a provided at an end of the external ground wire 8 to the projected portion. Specifically, the connection terminal 8a of the external ground wire 8 is sandwiched and fixed between the hexagon nut 4 and the hexagon nut 9 for connection.

[0005]

In the above-described conventional configuration, when a microwave oven is installed at home or the like, the connection terminal 8a of the external ground wire 8 must be connected to the long screw 5 of the ground terminal. In this case, it is necessary to perform an operation of tightening the hexagon nut 9 for connection. Since this tightening work requires special tools such as a spanner and a box driver, which are not often prepared in ordinary households, the work of connecting the external ground wire 8 to the ground connection portion cannot be easily performed. was there.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a microwave oven which can easily execute an operation of connecting an external ground wire to a ground connection portion.

[0007]

A first aspect of the present invention is an electronic sensor provided with a ground-inductor type noise filter, wherein an inductance element which is attached to an outer wall of a range body and forms a part of the noise filter is provided. A holder made of an insulating material having a holding portion for holding, a winding constituting the inductance element and having one end connected to an outer wall of the range main body, and a hole for screwing a male screw member fixed to the holder by insert molding; A female screw member made of a conductive material having a portion and connected to the other end of the winding, and an external male screw member screwed into the hole of the female screw member and connecting an external ground wire. (The invention of claim 1).

A second means is the first means, wherein the whole shape of the female screw member is cylindrical, and a hole for screwing the male screw member into the inside of the female screw member in a direction communicating with the inside and outside of the outer wall of the range main body. The internal thread member is screwed to one end of the hole of the female screw member to connect the other end of the winding, and the other end of the hole of the female screw member is formed. A feature is that an external male screw member is screwed on the side to connect an external ground wire (the invention of claim 2).

A third means is an electronic sensor provided with a ground-inductor-type noise filter, which has a holding portion attached to an outer wall portion of the range main body and holding an inductance element constituting a part of the noise filter. A holder made of an insulating material, a fitting portion having an inner peripheral surface formed in a non-circular shape formed on the holder, and a winding having one end connected to an outer wall portion of the range main body which constitutes the inductance element;
The outer shape is a non-circular shape that substantially matches the inner peripheral surface of the fitting portion, is inserted and fitted in the fitting portion of the holder in a non-rotating state, and has a hole for screwing a male screw member. A female screw member made of a conductive material connected to the other end side, and an external male screw member for external connection which is screwed into the hole of the female screw member and connects an external ground wire. invention).

[0010] A fourth means is the third means, wherein the fitting portion of the holder is formed in a concave shape with a bottom, and the bottom portion of the fitting portion of the holder is smaller than the inner width of the fitting portion. Also, a narrow male screw member insertion hole is formed, and the internal male screw member passing through this male screw member insertion hole is screwed into the hole of the female screw member fitted to the fitting portion, so that The invention is characterized in that the female screw member is prevented from falling off and the other end of the winding is connected to the female screw member by the internal male screw member (the invention of claim 4).

According to a fifth aspect of the present invention, there is provided an electronic sensor having a noise filter of a ground inductor type, comprising a holding portion attached to an outer wall of the range main body and holding an inductance element constituting a part of the noise filter. A holder made of an insulating material, a winding that constitutes the inductance element and has one end connected to an outer wall of the range main body,
A lead-out hole formed in the holder and leading the other end of the winding to the opposite side of the holding portion; and a hole provided in the holder for screwing a male screw member on the opposite side of the holding portion. A female screw member made of a conductive material connected to the other end of the winding,
An external male screw member which is screwed into the hole of the female screw member and connects an external ground wire is provided (the invention of claim 5).

A sixth means is the fifth means, wherein a connection terminal having an insertion hole is provided at the other end of the winding, and a connection terminal having an insertion hole at the connected end of the external ground wire. A terminal is provided, and the external male screw member is inserted into these connection terminals and screwed into the hole of the female screw member, so that the connection terminal of the winding and the connection terminal of the external ground wire are jointly fastened to the female screw member. The present invention is characterized in that the connection is made (the invention of claim 6).

The seventh means is characterized in that in the fifth or sixth means, the holder has a fixing means for engaging and fixing the female screw member (the invention of claim 7).

[0014]

In the first means, a female screw member is provided on the holder, and an external ground wire is connected to the hole of the female screw member by the external male screw member. The wire may be screwed with the external male screw member. In this case, unlike the nut tightening, the external male screw member is simply tightened with an ordinary screwdriver, so that the connection operation can be easily performed. Moreover, since the female screw member is fixed to the holder by insert molding, the time and effort for mounting the female screw member can be omitted, and the efficiency of the connection operation can be improved.

In this case, in the second means, an internal male screw member is screwed into one end of the hole of the female screw member and the other end of the winding is connected to the female screw member. The connection between the other end and the female screw member may be performed by screwing with an ordinary screwdriver, and the connection operation can be performed more easily.

In the third means, a female screw member is provided in the holder, and an external ground wire is connected to the hole of the female screw member by the external male screw member. The wire may be screwed with the external male screw member. In this case, unlike the nut tightening, the external male screw member is simply tightened with an ordinary screwdriver, so that the connection operation can be easily performed.
In addition, the holder is formed with a fitting portion whose inner peripheral surface is non-circular, and the external shape of the female screw member is also formed in the same non-circular shape, and the female screw member is fitted into this fitting portion in a detented state. Since it is fixed, the fixing of the female screw member to the holder is relatively easy.

In this case, in the fourth means, the fitting portion of the holder is formed in a concave shape with a bottom, and the bottom portion of the fitting portion of the holder is narrower than the inner width of the fitting portion. Forming a male screw member insertion hole through the male screw member insertion hole, and screwing the internal male screw member through the male screw member insertion hole into the hole portion of the female screw member fitted to the fitting portion. And the other end of the winding is connected to the female screw member by the internal male screw member, so that the female screw member can be securely attached to the holder, and the attachment and the winding and the female screw member can be connected. Since both the connection and the internal thread are performed by the internal male screw member, the connection operation is further facilitated and the configuration can be simplified.

In the fifth means, a female screw member is provided on the holder, and an external ground wire is connected to the hole of the female screw member by an external male screw member. The wire may be screwed with the external male screw member. In this case, unlike the nut tightening, the external male screw member is simply tightened with an ordinary screwdriver, so that the connection operation can be easily performed.
In addition, the other end of the winding is led out to the side opposite to the holding portion in the holder, and the connection is made only at the part on the opposite side. Therefore, the connection must be made without disturbing the winding and the like. Will be able to

In this case, in the sixth means, a connection terminal having an insertion hole is provided at the other end of the winding, and a connection terminal having the insertion hole is provided at the connected end of the external ground wire. The external male screw member is inserted into these connection terminals and screwed into the hole of the female screw member so that the connection terminal of the winding and the connection terminal of the external ground wire are fastened together and connected to the female screw member. Therefore, the number of male screw members to be used can be reduced.

[0020] In the seventh means, the holder is provided with:
Since the fixing means for engaging and fixing the female screw member is provided, attachment of the female screw member to the holder becomes easy.

[0021]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described below with reference to FIGS. In FIG. 2 showing a schematic external view of the microwave oven from the rear side, a microwave oven body 11 constituting an outer shell of the microwave oven has a rectangular box shape as a whole, and a cooking chamber (not shown) is provided therein. . The range main body 11 has a substantially U-shaped cabinet 12 and a rear plate 13 so as to cover the upper surface and both side surfaces.
And a bottom plate (not shown). The cabinet 12, the rear plate 13 and the bottom plate are made of a metal plate. Further, a door 14 for opening and closing the front opening of the cooking chamber is provided on the front part of the range body 11 so as to be capable of opening and closing.

Further, a machine room (not shown) is provided on the right side of the cooking chamber in the range main body 11, and a magnetron 15 for range cooking is provided in the machine room.
(See FIG. 3). This magnetron 15
The high frequency (microwave) oscillated from is supplied to the cooking chamber, so that range cooking is performed in the cooking chamber. As shown in FIG. 2, an operation panel 16 is provided on the front side of the range main body 11 in front of the machine room. The operation panel 16 includes various switch keys and various indicators. It should be noted that a number of electric components constituting the electric configuration of the microwave oven are arranged in the machine room.

Next, an electric configuration of the microwave oven will be described with reference to FIG. One power terminal 17a of the plug 17 connected to the commercial AC power source and the other power terminal 1
7b, the first door switch 18, the primary coil 19a of the high voltage transformer 19, the main switch 20, and the second door switch 21 are connected in series. A voltage doubler rectifier circuit 22 for driving the magnetron 15 is connected to the secondary coil 19b of the high voltage transformer 19, and the anode of the magnetron 15 is connected to another secondary coil 19c of the high voltage transformer 19. ing. The two-door switches 18 and 21 are opened and closed in accordance with the opening and closing of the door 14. On the opposite side of the power supply of the two-door switches 18 and 21, the opening and closing operations of the two-door switches 18 and 21 are reversed. The short switch 23 is connected.

Also, one power supply terminal 17a of the plug 17
A capacitor 24 is connected between the power supply terminal 17b and the power supply terminal 17b on the power supply side of the two-door switches 18 and 21, and a capacitor 25 and a capacitor 26 are connected in parallel with the capacitor 24. Are connected in series.

The capacitors 25 and 26
Is electrically connected to the range main body 11 and is grounded via the inductance element 27. At this time, a noise filter 28 is constituted by the inductance element 27 and the capacitors 24-26. Further, the voltage doubler rectifier circuit 22 of the secondary coil 19b of the high voltage transformer 19 is
1 and grounded via the inductance element 27.

As shown in FIG. 1, the inductance element 27 has a winding 3 around a core 29 made of a ferrite ring.
0 is wound. Now, the structure of the inductance element 27 will be described with reference to FIG. The rear plate 13 serving as an outer wall of the range body 11 is provided with a holder arrangement opening 13a, and a holder 31 is attached by, for example, a screw 32 so as to close the holder arrangement opening 13a. The holder 31 is formed of a plastic made of an electrically insulating material. The holder 31 has a holding portion 33 for holding the inductance element 27 so as to be located inside the range main body 11. The female screw member 34 is fixed by insert molding.

The female screw member 34 is made of a conductive material, for example, metal and has a cylindrical shape, and has a cylindrical shape. The female screw member is a female screw which is a hole for screwing a male screw member in a direction communicating with the inside and outside of the rear plate 13 inside the female screw member 34. This is a configuration in which a portion 35 is formed.

A connecting terminal 36 having a screw insertion hole is provided at one end 30a of the winding 30 by, for example, caulking.
7, and one end 30a of the winding 30 is electrically connected to the rear plate 13. Further, a connection terminal 38 having a screw insertion hole is provided at the other end 30 b of the winding 30 by, for example, caulking, and the connection terminal 38 is attached to the internal side end of the female screw portion 35 of the female screw member 34 for internal use. The other end 30 b of the winding 30 is electrically connected to the female screw member 34 by screwing with a screw 39 serving as a male screw member.

On the other hand, a connection terminal 41 having a screw insertion hole is provided, for example, by caulking at one end 40a which is a connected portion of the external ground wire 40, and an earth rod embedded, for example, in the ground is provided at the other end 40b. 42 are connected. The external ground wire 40 is screwed to the connection terminal 41 at the outer end of the female screw portion 35 of the female screw member 34 with a screw 43 serving as an external male screw member, so that the external ground wire 40 is conductively connected to the female screw member 34. ing.

According to this embodiment, the holder 31
A female screw member 34 is provided on the female screw member 34, and an external ground wire 40 is
3, the external ground wire 40 may be screwed with the screw 43 when connecting the external ground wire 40. In this case, unlike a nut tightening, the external ground wire 40 is connected to the external ground wire with a common screwdriver. Since only the male screw member is tightened, the connection operation can be easily performed. Moreover,
Since the female screw member 34 is fixed to the holder 31 by insert molding, the labor for mounting the female screw member 34 can be omitted, and the efficiency of the connection operation can be improved.

In this case, a screw 39 serving as an internal male screw member is screwed into one end of the female screw portion 35 of the female screw member 34 and the other end 30b of the winding 30 is connected to the female screw member 34. The connection between the other end 30b and the female screw member 34 may be performed by screwing with an ordinary screwdriver, and the connection operation can be performed more easily.

Next, FIGS. 4 and 5 show a second embodiment of the present invention. This embodiment has the following features. That is, the holder 51 is formed with a concave fitting part 52 having a bottom with a non-circular inner peripheral surface, for example, a hexagonal shape, and the bottom part is narrower than the inner width of the fitting part 52. A screw insertion hole 53 is formed as a male screw member insertion hole. The female screw member 54 is formed so as to form a non-circular hexagon whose outer shape substantially matches the inner peripheral surface of the fitting portion 52.

Thus, the female screw member 54 is fitted into the fitting portion 52, and the screw 55, which is an internal male screw member, is passed through the screw insertion hole 53, and the female screw portion 56 as a hole of the female screw member 54 is inserted.
The screw 55 connects the other end 30 b of the winding 30 to the female screw member 54 by screwing the female screw member 54 from the fitting portion 52.

In the second embodiment, the holder 51
The inner peripheral surface is formed with a hexagonal fitting portion 52, and the external shape of the female screw member 54 is also formed in a similar hexagonal shape, and the female screw member 54 is fitted into the fitting portion 52 in a detent state. Since they are fixed together, the female screw member 54 can be fixed to the holder 51 relatively easily.

The fitting portion 52 of the holder 51 is formed in a concave shape with a bottom, and a screw having a width smaller than the inner width of the fitting portion 52 is inserted through the bottom of the fitting portion 52 of the holder 51. A hole 53 is formed, and the screw 5 passing through the screw insertion hole 53 is formed.
5 is screwed into the female screw portion 56 of the female screw member 54 fitted to the fitting portion 52, thereby preventing the female screw member 54 from coming off from the fitting portion 52, and Since the other end 30b is connected to the female screw member 54, the female screw member 54 is securely mounted to the holder 51, and both the mounting and the connection between the winding 30 and the female screw member 54 are performed by the screw 55. In addition, the connection work is further facilitated, and the configuration can be simplified.

FIGS. 6 to 9 show a third embodiment of the present invention. This embodiment has the following features. That is, the holder 61 is formed with the lead-out hole 62, and the concave portion 63 for arranging the connection terminals is formed in a portion opposite to the holding portion 33. Then, the recess 63
Are formed with claw portions 64, 64 as fixing means. A burring hole 66 is formed in the connection terminal 65 serving as a female screw member provided by caulking at the other end 30b of the winding 30 so as to screw a male screw member by burring. The holding portion 33 is formed with a cutout portion 33b through which the other end 30b of the winding 30 is inserted.

The other end 30 b of the winding 30, that is, the connection terminal 65 is inserted through the lead-out hole 62 and led out to the outside (the opposite side of the holding portion 33). And the claw portions 64, 64
Are engaged and fixed. The connection terminal 41 of the external ground wire 40 is screwed to the connection terminal 65 by a screw 43. In this case, the screw 43 acts as a tapping screw, that is, is forcibly screwed into the burring hole 66.

According to the third embodiment, the other end 30b of the winding 30 is led out to the side opposite to the holding section 33 in the holder 61, and the connection operation is performed only at the opposite side. Therefore, the connection can be made without disturbing the winding 30 or the like, and the winding 30 can be prevented from being damaged. Further, the connection terminal 65 serving as a female screw member is provided in the holder 61.
Since the claw portions 64 are provided as fixing means for engaging and fixing the connection terminal 65, the connection terminal 65 can be easily attached to the holder 61.

The connection terminal 65 and the other end 30 of the winding 30
The connection with b is not limited to caulking, but may be by soldering (a soldered portion is indicated by reference numeral 67) as shown in FIG. 10 shown as a fourth embodiment of the present invention.

FIG. 11 shows a fifth embodiment of the present invention. This embodiment has the following features. That is, the holder 71 is formed with the lead-out hole 72, and a cylindrical female screw member 73 is fixed to a portion opposite to the holding portion 33 by insert molding.

The other end 30 b of the winding 30, that is, the connection terminal 38 is inserted through the lead-out hole 72 and led to the outside (the opposite side of the holding portion 33). A screw 74 serving as an external male screw portion is inserted through the connection terminal 38 and screwed into the female screw portion 73 a serving as a male screw screw hole of the female screw member 73, thereby winding the connection terminal 41 of the external ground wire 40 with the winding. The female screw member 73 is fastened together with the connection terminal 38 on the other end 30b side of the connector 30.
Connected to According to the fifth embodiment, the number of screws used can be reduced.

The present invention may be modified as follows. Instead of the female screw member 34 shown in FIG. 1, a female screw member 81 of FIG. 12 shown as a sixth embodiment of the present invention may be used. This female screw member 81 has separate female screw portions 81 at both ends.
a, 81b. Further, it is also possible to constitute the inductance element by a winding alone.

[0043]

As apparent from the above description, the present invention has the following effects. According to the first aspect of the present invention, when connecting the external ground wire, the external ground wire may be screwed with the external male screw member, and unlike the nut tightening, the external male screw member is connected with an ordinary screwdriver. The connection operation can be easily performed because the connection operation is simply performed. In addition, since the female screw member is fixed to the holder by insert molding, the labor for mounting the female screw member can be omitted, and the efficiency of the connection operation can be improved.

According to the second aspect of the present invention, the connection between the other end of the winding and the female screw member can be performed by screwing with an ordinary screwdriver, and the connection operation can be performed more easily.

According to the third aspect of the present invention, when an external ground wire is connected, the external ground wire may be screwed with the external male screw member. Since only the male screw member is tightened, the connection operation can be easily performed. In addition, the holder is formed with a fitting portion whose inner peripheral surface is non-circular, and the external shape of the female screw member is also formed in the same non-circular shape, and the female screw member is fitted into this fitting portion in a detented state. Because it is fixed,
The fixing of the female screw member to the holder can be relatively easy.

According to the fourth aspect of the present invention, the fitting portion of the holder is formed in a concave shape with a bottom, and the bottom portion of the fitting portion of the holder is narrower than the inner width of the fitting portion. By forming a male screw member insertion hole and screwing the internal male screw member through the male screw member insertion hole into the hole of the female screw member fitted to the fitting portion, the female screw member from the fitting portion is Since the inner thread member is connected to the other end of the winding by the internal male screw member, the female screw member is securely attached to the holder, and the attachment and connection between the winding and the female screw member are prevented. Since both of these steps are performed by the internal male screw member, the connection operation is further facilitated and the configuration can be simplified.

According to the fifth aspect of the present invention, when an external ground wire is connected, the external ground wire may be screwed with an external male screw member. Since only the male screw member is tightened, the connection operation can be easily performed. In addition, the other end of the winding is led out to the side opposite to the holding portion in the holder, and the connection is made only at the part on the opposite side. Therefore, the connection must be made without disturbing the winding and the like. Can be.

According to the invention of claim 6, a connection terminal having an insertion hole is provided at the other end of the winding, and a connection terminal having an insertion hole is provided at a connected end of the external ground wire. By inserting the external male screw member into these connection terminals and screwing it into the hole of the female screw member, the connection terminal of the winding and the connection terminal of the external ground wire are fastened together and connected to the female screw member. Therefore, the number of male screw members to be used can be reduced.

According to the seventh aspect of the present invention, since the holder is provided with the fixing means for engaging and fixing the female screw member, the female screw member can be easily attached to the holder.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional side view of a ground structure portion showing a first embodiment of the present invention.

FIG. 2 is a perspective view of the whole as viewed from the back.

FIG. 3 is an electric circuit diagram

FIG. 4 is a view corresponding to FIG. 1, showing a second embodiment of the present invention;

FIG. 5 is a perspective view of a female screw member and a fitting portion.

FIG. 6 is a view corresponding to FIG. 1, showing a third embodiment of the present invention.

FIG. 7 is a perspective view of the other end of the winding.

FIG. 8 is a perspective view of a nail portion.

FIG. 9 is a longitudinal sectional side view showing an arrangement structure of connection terminals.

FIG. 10 is a view corresponding to FIG. 7, showing a fourth embodiment of the present invention;

FIG. 11 is a view corresponding to FIG. 1, showing a fifth embodiment of the present invention.

FIG. 12 is a longitudinal sectional side view of a female screw member showing a sixth embodiment of the present invention.

FIG. 13 is a longitudinal side view of an external ground wire connection portion showing a conventional example.

[Explanation of symbols]

11 is a range body, 13 is a rear plate (outer wall portion), 15 is a magnetron, 24, 25 and 26 are capacitors, 27 is an inductance element, 28 is a noise filter, 29 is a core, 30 is a winding, 31 is a holder, 33 Is a holding portion, 34 is a female screw member, 35 is a female screw portion (a hole portion for screwing a male screw member), 36 is a connection terminal, 38 is a connection terminal, 39 is a screw (internal male screw member), 40 is an external ground wire, 41 Is a connection terminal, 43 is a screw (external male screw member), 51 is a holder, 52 is a fitting portion, 53 is a screw insertion hole (male screw member insertion hole), 54 is a female screw member, 61 is a holder, and 62 is a lead hole. , 63 is a concave portion, 64 is a claw portion (fixing means), 65 is a connection terminal (female screw member), 66 is a burring hole (a hole portion for screwing a male screw member), 71 is a holder, 72 is a lead-out hole portion, 73
Is a female screw member, 73a is a female screw portion (a hole portion for male screw), 74 is a screw (external male screw member), and 81 is a female screw member.

Claims (7)

(57) [Claims] 1. An electronic device comprising a ground-inductor type noise filter, comprising: a holding member mounted on an outer wall portion of a range main body and holding a inductance element forming a part of the noise filter. A holder, a winding constituting the inductance element, one end of which is connected to an outer wall of the range main body; and a holder fixed to the holder by insert molding, having a hole for screwing a male screw member, and the other winding. A microwave oven comprising: a female screw member made of a conductive material connected to an end side; and an external male screw member screwed into the hole of the female screw member to connect an external ground wire. 2. The female screw member has a cylindrical shape in its entirety, and has a hole for screwing a male screw member in a direction communicating the inside and the outside of an outer wall portion of the range main body inside the female screw member. An external male screw member is screwed to one end of the internal thread member to connect the other end of the winding, and an external male screw member is screwed to the other end side of the hole of the female screw member to form an external ground wire. The microwave oven according to claim 1, wherein the microwave oven is connected. 3. An electronic device comprising a ground-inductor type noise filter, comprising: a holding member attached to an outer wall portion of a range main body and holding an inductance element forming a part of the noise filter. A holder, a fitting portion formed on the holder, the inner peripheral surface of which is non-circular; a winding forming the inductance element, one end of which is connected to an outer wall portion of the range main body; A non-circular shape that substantially matches the inner peripheral surface of the wire, is inserted into the fitting portion of the holder in a non-rotating state, and has a hole for screwing a male screw member, and is connected to the other end of the winding. A microwave oven comprising: a female screw member made of a conductive material; and an external male screw member that is screwed into the hole of the female screw member and connects an external ground wire. 4. The fitting portion of the holder is formed in a concave shape with a bottom,
In addition, a male screw member insertion hole narrower than the inner width of the fitting portion is formed in a bottom portion of the fitting portion of the holder, and an internal male screw member passing through the male screw member insertion hole is fitted. By screwing into the hole of the female screw member fitted to the part, while preventing the female screw member from coming off from the fitting part,
4. The microwave oven according to claim 3, wherein the other end of the winding is connected to the female screw member by the internal male screw member. 5. An electronic device comprising a ground inductor type noise filter, comprising: a holding member attached to an outer wall of a range main body, the holding member holding an inductance element constituting a part of the noise filter. A holder, a winding that constitutes the inductance element and has one end connected to an outer wall of the range main body, and a lead hole formed in the holder and leading the other end of the winding to an opposite side of the holding unit. A female screw member made of a conductive material which is provided on the holder and has a hole for screwing a male screw member on the opposite side of the holding portion and connected to the other end of the winding; and the hole portion of the female screw member And an external male screw member connected to an external ground wire and screwed into the microwave oven. 6. A connection terminal having an insertion hole is provided at the other end of the winding, and a connection terminal having an insertion hole is provided at a connected end of the external ground wire. By inserting these connection terminals and screwing into the holes of the female screw member, the connection terminal of the winding and the connection terminal of the external ground wire are jointly fastened and connected to the female screw member. The microwave oven according to claim 5. 7. The microwave oven according to claim 5, wherein the holder has fixing means for engaging and fixing the female screw member.