JP2551775Y2 - Noise filter - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a noise filter comprising electronic components such as a coil and a capacitor, and more particularly to a structure of a ground terminal coupled to the electronic components.

[0002]

2. Description of the Related Art In a conventional noise filter, a coil, a capacitor, a varistor and other electronic parts are placed in a resin base, and the electronic parts are connected to the ground via a lead wire to a ground terminal fixed to the resin base. And a structure for connecting the ground terminal to a device equipped with a noise filter.

[0003]

In this conventional noise filter, a ground terminal must be attached to a resin base, and the ground terminal needs to be connected to a device to be mounted via a lead wire. There is a problem that it takes time. In addition, since the electronic component is mounted on the resin case, there is a problem that heat radiation performance of the electronic component is insufficient.

SUMMARY OF THE INVENTION In view of the above problems, an object of the present invention is to provide a noise filter having a structure that can be easily assembled and has satisfactory performance in terms of heat radiation.

[0005]

The noise filter of the present invention comprises a resin base on which electronic components constituting the noise filter are mounted, and a metal ground plate combined with the base, and a mounting piece for equipment. And a ground mounting plate manufactured by punching and bending, wherein a ridge-shaped ridge is formed in the bottom plate of the base with an internal opening, and a portion located outside the ridge of the bottom plate. A hole or a groove for inserting a ground piece is formed in the base plate, a plurality of protrusions (or recesses) are formed on a side surface of the base, and a ridge is formed on a plate surface of the mounting plate. A plurality of connecting pieces are formed on the side edge perpendicular to the plate surface of the mounting plate, and locking holes (or projections) are provided in each of the connecting pieces, and the mounting plate is provided at an end of the mounting plate. Perpendicular to the board surface A ground piece is formed, a ridge of the mounting plate is fitted into a fold-shaped recess on the lower surface of the ridge, a coil is inserted into the ridge of the base, and the coil and the mounting plate are insulated at the opening in the ridge. An insulating plate to be interposed and filled with casting resin, the grounding piece of the mounting plate is inserted into the grounding piece insertion hole of the bottom plate portion of the base, and the grounding piece is connected to an electronic component in the base. Of the mounting plate is held between the plurality of connecting pieces of the mounting plate, and the mounting plate is connected to the base by locking the locking holes (or projections) of the connecting piece to the protrusions (or recesses) on the side surface of the base. It is characterized by the following.

[0006]

Since the noise filter of the present invention has the above-described structure, the electronic component is connected to the ground via the earthing piece and the mounting plate integrated with the earthing piece only by attaching the mounting piece to the mounted equipment. The ground piece is formed at the end of the mounting plate, that is, outside the ring-shaped ridge, and the hole on the base side for inserting the ground piece is provided outside the ridge of the mounting plate serving as a casting resin reservoir. As a result, the casting resin injected between the coil and the mounting plate in a flowing state does not leak at the ground piece.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings. 1A is a perspective view showing an embodiment of the present invention, FIG. 1B is a circuit diagram of a noise filter of the embodiment, FIG. 2 is an exploded perspective view of the embodiment, and FIG. FIG. 1B is a longitudinal sectional view of the embodiment, and FIG. 1B is a schematic plan view thereof. As shown in the circuit diagram of FIG. 2, the noise filter 1 of this embodiment is installed between a power supply terminal 2 and an electric equipment circuit 3 in an electric equipment such as a microwave oven, Is prevented from leaking to the outside through the power supply line (to prevent intrusion of external noise or to prevent both noises from entering and exiting).
, A capacitor 5, and a pair of capacitors 6 provided between the ground and the power supply line.
Alternatively, a varistor or a combination thereof may be used. Reference numeral 7 denotes a resin base on which these electronic components are mounted, and reference numeral 8 denotes a ground mounting plate.

As shown in FIGS. 2 and 3A, the base 7 has a ring-shaped and pleated ridge 7b for accommodating the coil 4 on the bottom plate 7a. The opening 7c is formed in the inside of the. Also, the bottom plate 7
A grounding piece insertion hole 7d (may be a groove) is formed at a position located outside the raised portion 7b, and a plurality of (two in this embodiment) projections 7e are formed on both side surfaces of the base. ,
A mounting hole 7f for the terminal 9 is provided so as to surround the raised portion 7b.

On the other hand, the mounting plate 8 is formed by stamping and bending a metal plate such as an iron plate, and also serves as an earth plate. As shown in FIG. 2 and FIG. A ridge portion 8a is formed, and on the side edge of the mounting plate 8,
A plurality of (two in each case, left and right in this embodiment) connecting pieces 8b are formed perpendicular to the plate surface of the mounting plate 8, and locking holes 8c are provided in each of the connecting pieces 8b. A ground piece 8d is formed by cutting and raising the end of the mounting plate 8 perpendicularly to the surface of the mounting plate 8 as shown by an arrow a in FIG. Also,
At the left and right edges where the coupling pieces 8b are formed, mounting pieces 8e for fixing to a case or a substrate serving as a ground of a microwave oven with screws or the like are formed.

Then, as shown in FIG. 3 (A), the ridge 8a of the mounting plate 8 is fitted into a fold-shaped recess 7g on the lower surface of the raised portion 7b of the base 7, and a ground piece is inserted into the bottom plate 7a. The earthing piece 8d of the mounting plate 8 is inserted into the through hole 7d, and the side surface of the base 7 is sandwiched by a plurality of connecting pieces 8b of the mounting plate 8, as shown in FIG. 8
The mounting plate 8 is connected to the base 7 by locking the locking hole 8c of b.

As shown in FIG. 3A, an insulating plate 10 slightly smaller than the opening 7c is inserted into the opening 7c of the base 7, and a casting resin 11 having good heat conductivity is injected. 4 is inserted into the raised portion 7b, the space between the coil 4 and the mounting plate 8 is filled with the casting resin 11, and the coil 4 is
Fixed to Here, since the ridge portion 8a is formed on the mounting plate 8, when the casting resin 11 having fluidity is injected,
There is no possibility that the casting resin 11 flows out of the mounting plate 8.

Also, capacitors 5 and 6 are mounted on the bottom plate portion 7a, and the coils 4 and 6 are arranged so as to constitute the circuit shown in FIG.
Are connected to the terminals 9 and soldered (not shown), the lead wires 5a at both ends of the capacitor 5 are connected to the two terminals 9, and The lead wire 6a at one end is also connected to the left and right terminals 9, and the lead wire 6a at the other end of each capacitor 6 is
d and soldered.

By the way, as shown in FIG.
In some cases, a cross-the-line capacitor 5 is provided on the side opposite to the case of (B). That is, depending on the model on which the noise filter is mounted, the circuit characteristics change depending on whether the capacitor 5 is mounted on the same side as the capacitor 6 or on the opposite side. On the side. in this case,
In this embodiment, the base 7 has a rectangular shape, and the coil 4 and other electronic components have a structure arranged in the long side direction of the base. Since a plurality of protrusions 7e for connecting the mounting plate are formed, the connecting pieces 8b are formed on both sides of the mounting plate 8, and the mounting pieces 8e for the equipment are formed on both sides. The mounting plate 8 can be commonly used for the arrangement shown in FIG. 3B and the arrangement shown in FIG. 3C, and the area occupied by the whole can be reduced without increasing the width W. Also, the earth piece insertion hole 7
Since d is provided in the bottom plate portion 7a, the length L of the mounting plate 8 can be made smaller than the length of the base 7, and the material of the mounting plate 8 can be saved.

FIG. 4A shows another example of the grounding piece 8g, which is formed by cutting and raising the grounding piece 8g from the side edge of the mounting plate 8 as indicated by an arrow a. If this is the case, material costs can be further reduced as compared with the above embodiment. FIG. 4B shows another example of the ground piece 8g.
By twisting the ground piece 8g of (A), the lead wire 4a
The soldering is facilitated by orienting the notch portion b sandwiching the in the electronic component arrangement direction. That is, due to the terminal 9, the insertion of the iron when soldering is easier in the direction in which the electronic components are arranged than in the direction perpendicular to the direction in which the electronic components are arranged.

A hole or a stepped recess is provided instead of the projection 7e in the above embodiment, and
It is also possible to provide a projection in the shape of a column or a hook on b, so that both are engaged.

[0016]

According to the first aspect of the present invention, the mounting plate is easily combined with the resin base, and the electronic component can be connected to the ground by mounting the mounting plate to the electric device. Therefore, the ground terminal is mounted on the base. No longer needed
As a result, assembling becomes easy, and since the metal mounting plate is joined to the coil via the casting resin, a satisfactory heat dissipation can be obtained.

According to the second aspect, even if the arrangement of the electronic components mounted on the base changes and the shape of the base changes, the mounting plate is displaced relative to the base, so that the common base can be used for different bases. Can be used, the manufacturing equipment can be simplified, and the total occupied area can be reduced.

[Brief description of the drawings]

FIG. 1A is a perspective view showing an embodiment of the present invention, and FIG. 1B is a circuit diagram of a noise filter of the embodiment.

FIG. 2 is an exploded perspective view of the present embodiment.

3A is a longitudinal sectional view of the present embodiment, FIG. 3B is a schematic plan view thereof, and FIG. 3C is a schematic plan view showing an arrangement of mounted electronic components changed.

FIGS. 4A and 4B are perspective views of a mounting plate showing another example of the ground piece of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Noise filter 2 Power supply terminal 3 Electric circuit 4 Coil 5 Capacitor 6 Capacitor 7 Base 7a Bottom plate 7b Raised portion 7c Opening 7d Ground piece insertion hole 7e Projection 7f Terminal mounting hole 7g Depression 8 Mounting plate 8a Protrusion 8b Coupling Piece 8c Locking hole 8d, 8f, 8g Ground piece 8e Mounting piece 9 Terminal 10 Insulating plate 11 Cast resin

 ──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-62-245713 (JP, A) JP-A-58-139724 (JP, U) JP-A-57-168318 (JP, U) JP-A-57-168318 166416 (JP, U)

Claims (2)

(57) [Scope of request for utility model registration] 1. A resin base on which electronic components constituting a noise filter are mounted, a metal ground plate combined with the base, a mounting piece for equipment, and a stamping and bending process. The base plate of the base is formed with a ridge having a pleated shape with an internal opening in the bottom plate of the base, and an earth piece insertion hole or groove is formed at a location located outside the ridge of the bottom plate. A plurality of projections (or recesses) are formed on the side surface of the base; and a ridge is formed on the plate surface of the mounting plate, on the side edge of the mounting plate, on the plate surface of the mounting plate. A plurality of connecting pieces are formed vertically with respect to each other, and locking holes (or projections) are provided in each of the connecting pieces, and cut and raised at the end of the mounting plate perpendicularly to the plate surface of the mounting plate. Forming a ground strip, a fold on the underside of the ridge The protrusions of the mounting plate are fitted into the portions, the coil is inserted into the protruding portion of the base, an insulating plate for insulating the coil and the mounting plate is interposed in the opening in the protruding portion, and the casting resin is filled. A ground piece of the mounting plate is inserted into a ground piece insertion hole of a bottom plate portion of the base, the ground piece is connected to an electronic component in the base, and a side portion of the base is connected to a plurality of connecting pieces of the mounting plate. Sandwiched between
A noise filter, wherein the mounting plate is connected to the base by locking the locking hole (or protrusion) of the connecting piece to the protrusion (or recess) on the side surface of the base. 2. The base according to claim 1, wherein the base has a rectangular shape, and the coil and another electronic component have a structure arranged in a long side direction of the base to form a long side of the base. A plurality of projections (or recesses) for connecting the mounting plate are formed on side surfaces, and the connecting pieces are formed on both sides of the mounting plate, and mounting pieces for equipment are formed on both sides. And a noise filter.