JPH0917655A - Electromagnetic apparatus - Google Patents

Abstract

PURPOSE: To provide a low-priced and low noise electromagnetic apparatus by reducing vibrations transmitted from an electromagnetic apparatus main body to a case main body and noise due to the vibrations without adding a member for reducing noise thereto. CONSTITUTION: An electromagnetic apparatus main body 1 having an iron core part is mounted on a case main body 8 by using a mounting part 3 and a fixing vis. A larger opening part 2 than the bottom area of the electromagnetic apparatus main body 1 is formed in the part of the case main body 8, which is opposite to the electromagnetic apparatus main body 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electromagnetic device used for a discharge lamp lighting device or the like.

[0002]

2. Description of the Related Art Conventionally, as an electromagnetic device used in a discharge lamp lighting device, there is, for example, a copper-iron type ballast as disclosed in Japanese Utility Model Publication No. 4-10327. As shown in FIG. 16, the electromagnetic device that constitutes this ballast is a holding device that holds a predetermined distance between the inner surface of the case 34 and an end plate 41 provided at one end of the case 34 and the electromagnetic device body 39. The parts 37 and 38 are made to project from the cap bodies 35 fitted to both ends of the iron core part 40 that constitutes the electromagnetic device body 39, and a gap is provided between the electromagnetic device body 39 and the case 34, and further the compound is formed. By filling 36 between the electromagnetic device body 39 and the inner surface of the case 34, the vibration of the electromagnetic device body 39 is prevented from being directly transmitted to the case 34, and the vibration and the noise due to the vibration are reduced.

Further, there is a discharge lamp lighting device including an electronic ballast as disclosed in Japanese Utility Model Publication No. 6-46012, and a transformer is an electromagnetic device used for the discharge lamp lighting device. As shown in FIG. 17, an electromagnetic device 43, which is a transformer used in this conventional example, includes a circuit board 4
The iron core portion 45 of the electromagnetic device 43 is penetrated through the substrate opening portion 48 formed in FIG.
By contacting and fixing the upper and lower inner surfaces of the case 42 via the and 47, the generation of noise due to the vibration of the electromagnetic device 43 is prevented.

Further, as shown in FIG. 18, a vibration-damping rubber 49 is attached to the bottom surface of the case 50 containing the electromagnetic device, so that the case 50 is attached to the vibration of the electromagnetic device through the case 50. It is made difficult to propagate to the device, and the vibration of the device in which the case 50 is mounted and the noise due to the vibration are reduced.

[0005]

By the way, in each of the above-mentioned conventional examples, in order to reduce the noise due to the vibration of the iron core portion of the electromagnetic equipment, it is necessary to fill the compound or attach the cushioning material. The number of parts has increased, and there have been problems of reduced productivity and increased costs. The present invention has been made in view of the above problems, and it is possible to reduce noise due to vibration of the iron core without adding a member for noise reduction such as filling of a compound or attachment of a buffer, and the like. The purpose is to provide an inexpensive and low-noise electromagnetic device.

[0006]

According to the present invention, in order to achieve the above object, an electromagnetic equipment body having an iron core portion, and an attachment portion attached to the electromagnetic equipment body for attaching the electromagnetic equipment body to a case, In an electromagnetic device including a case, an opening for noise reduction is formed in a case portion facing the main body of the electromagnetic device.

According to a second aspect of the present invention, in the invention of the first aspect, the opening is formed from a plurality of openings, and a case portion serving as a boundary between the adjoining openings is used as a support portion for contacting the electromagnetic device body and the case. There is. According to a third aspect of the present invention, in the second aspect of the present invention, a damping material having a vibration damping property is interposed between the support portion and the electromagnetic device body.

Further, according to a fourth aspect, in the invention of the second aspect, the convex portion is formed on the support portion or the surface of the main body of the electromagnetic device facing the support portion. According to a fifth aspect, in the invention according to the first or second aspect, a corrugated metal plate having good thermal conductivity is interposed between the position of the case other than the opening and the main body of the device to which the case is attached. ing.

[0009]

According to the first aspect of the present invention, the opening for noise reduction is formed in the case portion facing the main body of the electromagnetic device, so that the case is removed from the main body of the electromagnetic device without adding a member for noise reduction. It is possible to reduce the vibration propagating to and the noise due to the vibration, and it is possible to provide an apparatus having an inexpensive and low-noise electromagnetic device.

According to the second aspect of the present invention, the opening is formed by a plurality of openings, and the case portion serving as a boundary between the adjoining openings is used as a supporting portion for contacting the electromagnetic device body and the case. It is possible to increase the strength of the case while reducing the vibration and the noise due to the vibration. According to the third aspect of the present invention, the cushioning material having the vibration damping property is interposed between the support portion and the electromagnetic equipment body to increase the strength of the case and propagate from the electromagnetic equipment body to the case. Vibration and noise due to vibration can be reduced.

Further, according to the invention of claim 4, by forming the convex portion on the surface of the electromagnetic equipment body facing the supporting portion or the supporting portion, the electromagnetic noise can be further reduced without adding a member for noise reduction. It is possible to reduce vibrations transmitted from the device body to the case and noises due to the vibrations. Further, according to the invention of claim 5, between the position of the case other than the opening and the mounting portion and the apparatus main body to which the case is mounted,
By interposing a corrugated metal plate with good thermal conductivity, it is possible to reduce the vibration and noise caused by the vibration transmitted from the main body of the electromagnetic device to the main body of the device to which the case is attached. Can be obtained.

[0012]

EXAMPLES The present invention will be described with reference to examples. (Embodiment 1) FIG. 4 shows a configuration of a discharge lamp lighting device including an inverter circuit used in the present embodiment. This discharge lamp lighting device includes an AC power supply 20 and a distortion of an input current from the AC power supply 20. Filter circuit 2 for improving characteristics and power factor
1, a rectifier circuit 22 including a diode bridge DB that rectifies the output of the filter circuit 21 and converts it into a direct current, and a capacitor C that smoothes the output of the rectifier circuit 22 and doubles the voltage.
2, C3, diodes D1, D2, D3, and a smoothing circuit 23, and an inverter circuit 24 that receives the DC voltage output from the smoothing circuit 23 and obtains high-frequency power as an output.
And a discharge lamp 25 energized by the high frequency power output from the inverter circuit 24.

The filter circuit 21 comprises a distortion improving choke coil L1 and a power factor improving capacitor C1. The choke coil L1 has a magnetic steel sheet iron core and a metal shell. The choke coil L1 constitutes an electromagnetic equipment body corresponding to the present embodiment.
Next, based on FIGS. 1 to 3, the electromagnetic device of this embodiment used in the discharge lamp lighting device will be described.

This embodiment comprises an electromagnetic device body 1 which constitutes the choke coil L1 and a case 10. The case 10 has both side edges bent upward as shown in FIG. 2 or FIG. It is composed of a flat case body 8 and a case lid 9 attached to the upper surface of the case body 8. Here, the case body 8 is provided with the electromagnetic device body 1 on one upper surface thereof and the circuit board 18 on which electronic components constituting the inverter circuit 24 and the like are mounted on the other upper surface thereof, and further, the case body 8 is provided at both ends thereof. A ballast mounting hole 4 for mounting the main body 8 on a housing of a lighting fixture or the like is provided.

As shown in FIG. 3, the electromagnetic device body 1 has fixing screw insertion holes 7 for attaching the electromagnetic device body 1 to the case body 8 on both side surfaces located slightly above the bottom surface. The mounting portion 3 is provided so as to project. The case main body 8 forms a mounting seat 11 of the mounting portion 3 of the electromagnetic equipment main body 1 by recessing a part of the case main body 8 upward from the lower surface side, and a recess 5 formed on the back side of the mounting seat 11 is formed. Is used as a relief for the head of the fixing screw 6. Then, in the electromagnetic device body 1, the mounting portion 3 is placed on the mounting seat 11, and the fixing screw 6 and the nut 6a inserted through the mounting hole 11a provided in the mounting seat 11 and the mounting hole 7 of the mounting portion 3 are inserted. Is fixed to the case body 8. The fixing screw 6 may be a rivet.

Here, as shown in FIGS. 1 and 3, in order to prevent the electromagnetic equipment body 1 from coming into contact with the case body 8, the electromagnetic equipment body 1 is provided at a portion of the case body 8 facing the electromagnetic equipment body 1.
An opening 2 having a larger area than the bottom area of the electromagnetic device main body 1 to the mounting portion 6 is formed by the opening 2.
The vibration transmitted to the case main body 8 via and the noise due to the vibration are reduced.

As shown in FIG. 3, the circuit board 18
The front and rear ends of the case body 8 through the insulating base 15.
Fixed on top. Then, on the circuit board 18, the electronic component 1 that constitutes the filter circuit 21, the rectifying circuit 22, the smoothing circuit 23, and the inverter circuit 24 excluding the electromagnetic device body 1
4 has been implemented. In these electronic components 14, leads 16 protruding downward are inserted into a circuit board 18 and soldered to the conductive pattern surface thereof.

Here, in order to maintain insulation between the lead 16 and the case body 8, an insulating sheet 17 is attached to the upper surface of the case body 8 located below the circuit board 18, If a sufficient insulation distance is secured between 16 and the case body 8, the insulating sheet 17 is not necessary. The electromagnetic device body 1 is electrically connected to the terminal block 19a and the circuit board 18 by the lead wires 12 by using the lead pins 13, and the terminal block 19b is electrically connected to the circuit board 18 by the lead wires 12. Has been done.

(Second Embodiment) In the first embodiment, the electronic component 14
Was mounted on one circuit board 18, but in the present embodiment, in order to design the optimum arrangement of the electronic components 14,
As shown in FIG. 5, the electronic component 14 has two circuit boards 1
8, the electromagnetic device body 1 is arranged in the center of the case body 8, and two circuit boards 1 are arranged on the left and right sides of the electromagnetic equipment body 1.
8 and 18 are arranged.

Since the mounting structure of the electromagnetic device body 1 and the structure of the opening 2 of the case body 8 are the same as those in the first embodiment, the description thereof will be omitted. (Embodiment 3) In Embodiment 1, one opening 2 was provided, but in this embodiment, the opening 2 is divided into two parts as shown in FIG. Two openings 2a
In addition to the above, the portion of the case 10 located between the two openings 2a serves as the support portion 26 of the electromagnetic device body 1.

Here, when the electromagnetic equipment body 1 is attached to the case body 8, by supporting the bottom surface of the electromagnetic equipment body 1 by the support portion 26, vibrations and vibrations propagated from the electromagnetic equipment body 1 to the case body 8 are generated. It is intended to increase the strength of the case body 8 while reducing noise. still,
The mounting configuration of the electromagnetic device body 1 is the same as that of the first embodiment, and thus the description thereof is omitted.

(Embodiment 4) In Embodiment 1, one opening 2 was provided, but in this embodiment, as shown in FIG.
The opening 2 is composed of a plurality of mesh-shaped openings 2b, and the portion of the case 10 serving as a boundary of the openings 2b is formed by the support portion 2.
7 is set. Here, the electromagnetic device body 1 is replaced with the case body 8
When mounted on the electromagnetic device body 1, the electromagnetic device body 1 is supported by the supporting portion 27 as in the third embodiment.
It is intended to further increase the strength of the case body 8 while reducing the vibrations and the noise caused by the vibrations that propagate from the case body 8 to the case body 8.

Since the mounting structure of the electromagnetic device body 1 is the same as that of the first embodiment, the description thereof will be omitted. (Fifth Embodiment) In the third or fourth embodiment, the supporting portion 26 or 27 is used.
However, in the present embodiment, as shown in FIG. 8, a damping material 28 having a vibration damping property is interposed between the supporting portion 26 or 27 and the electromagnetic equipment body 1. By doing so, the strength of the case main body 8 is increased, and at the same time, the vibration transmitted from the electromagnetic equipment main body 1 to the case main body 8 via the support portion 26 or 27 and the noise due to the vibration are reduced.

The mounting structure of the electromagnetic device body 1 is the same as that of the first embodiment.
Since the configuration of the opening 2 is the same as that of the third or fourth embodiment, the description thereof will be omitted. (Embodiment 6) In Embodiment 3, the main body 1 of the electromagnetic device is the supporting portion 2
Although it is in surface contact with 6, the present embodiment provides two convex portions 29 on a portion of the bottom surface of the electromagnetic device body 1 facing the supporting portion 26, as shown in FIG. The electromagnetic device body 1 and the supporting portion are in point contact with each other. This point contact reduces the contact area between the electromagnetic device body 1 and the support portion 26 in the present embodiment compared to the third embodiment, and the vibration propagating from the electromagnetic device body 1 to the case body 8 through the support portion 26. Moreover, the noise due to vibration is further reduced.

The mounting structure of the main body 1 of the electromagnetic equipment is the first embodiment.
Since the configuration of the opening 2 is the same as that of the third embodiment, the description thereof will be omitted. (Embodiment 7) In the embodiment 3, the electromagnetic device body 1 is provided with the supporting portion 2
In this embodiment, as shown in FIG. 10, two convex portions 29 are provided on the support portion 26, and these convex portions 2 are in contact with each other.
9, the electromagnetic device body 1 and the case body 8 are in point contact with each other. Due to this point contact, the present embodiment is equivalent to the sixth embodiment.
Similarly, the contact area between the electromagnetic device body 1 and the support portion 26 is reduced, and the vibration and the noise due to the vibration propagating from the electromagnetic device body 1 to the case body 8 via the support portion 26 are further reduced.

The mounting structure of the electromagnetic device body 1 is the same as that of the first embodiment.
Since the configuration of the opening 2 is the same as that of the third embodiment, the description thereof will be omitted. (Embodiment 8) The case 10 incorporating the electromagnetic device body 1 as in each of the above-described embodiments is attached to the device body 32 such as a lighting fixture by using the ballast attachment hole 4 with the ballast attachment screw 31. In this case, there are the following issues. That is, due to the warp of the case body 8,
When a gap 33 is generated between the device body 32 and the device body 32, heat is not sufficiently radiated from the case body 8 to the device body 32,
The electronic components 14 in the case 10 become hot and the device body 3
The reliability of the operation of 2 decreases.

Therefore, in this embodiment, FIG. 13 or FIG.
As shown in FIG. 12, between the position of the lower surface of the case 10 substantially corresponding to the position where the circuit board 18 is arranged and the apparatus main body 32 to which the case 10 is attached, a cross section having good thermal conductivity as shown in FIG. By interposing the corrugated metal plate 30,
The vibration of the electromagnetic device body 1 propagating to the device body 32 through the metal plate 30 and the noise due to the vibration are reduced, and the heat radiation effect is obtained.

13 and 14 respectively correspond to the first or third embodiment, it goes without saying that this embodiment can be applied to other embodiments. (Ninth Embodiment) In the eighth embodiment, the metal plate 30 is interposed between the position of the case 10 other than the opening 2 and the mounting portion 3 and the apparatus main body to which the case 10 is mounted. As shown in FIG. 15, the metal plate 30 is provided only on the portion of the case 10 where the electronic component 14 having a particularly high temperature among the electronic components 14 mounted on the circuit board 18 mounted on the case 10 is arranged. By arranging them, the noise is reduced by the metal plate 30 having a small surface area as compared with the case of the eighth embodiment, and further the heat radiation effect is obtained.

Since the other construction is the same as that of the first embodiment, its explanation is omitted. In addition, the configuration of this embodiment is
Of course, it can be applied to other than the first embodiment.

[0030]

As described above, according to the first aspect of the present invention, the opening for noise reduction is formed in the case portion facing the main body of the electromagnetic device, so that the electromagnetic reduction can be achieved without adding a member for noise reduction. There is an effect that it is possible to reduce vibration propagating from the device body to the case and noise due to the vibration, and to provide an inexpensive device having an electromagnetic device.

According to the second aspect of the present invention, the opening is formed from a plurality of openings, and the case portion serving as a boundary between the adjoining openings serves as a support portion for contacting the electromagnetic device body and the case. There is an effect that the strength of the case is increased while reducing the vibration and the noise due to the vibration propagating from the device body to the case. Further, the invention of claim 3 increases the strength of the case by interposing a damping material having a vibration damping property between the support portion and the main body of the electromagnetic device, and
There is an effect of further reducing the vibration transmitted from the electromagnetic device body to the case and the noise due to the vibration.

Still further, according to the invention of claim 4, by forming a convex portion on the support portion or on the surface of the main body of the electromagnetic device facing the support portion, it is possible to add a member for noise reduction,
Further, there is an effect of reducing the vibration transmitted from the main body of the electromagnetic device to the case and the noise due to the vibration. Claim 5
According to the invention of claim 1, by interposing a metal plate having a corrugated section having good thermal conductivity between the position of the case other than the opening and the mounting portion and the device body to which the case is mounted, the electromagnetic device body is moved to the case. The vibration and the noise due to the vibration that are transmitted to the main body of the device to which the device is attached can be reduced, and a heat dissipation effect can be obtained.

[Brief description of the drawings]

FIG. 1 is a bottom view of the first embodiment.

FIG. 2 is an external perspective view of the same.

FIG. 3 is a transverse sectional view of the above.

FIG. 4 is a circuit block diagram of a discharge lamp lighting device using the present invention.

FIG. 5 is a cross-sectional view of the second embodiment.

FIG. 6 is a bottom view of the third embodiment.

FIG. 7 is an enlarged bottom view of the fourth embodiment with part omitted.

FIG. 8 is an enlarged transverse cross-sectional view of the fifth embodiment with part omitted.

FIG. 9 is a vertical sectional view of a sixth embodiment.

FIG. 10 is a vertical cross-sectional view of Example 7.

FIG. 11 is a side view of the eighth embodiment.

FIG. 12 is a side view of a metal plate used in the above.

FIG. 13 is a bottom view of the above.

FIG. 14 is a bottom view of another example of the above.

FIG. 15 is a bottom view of the ninth embodiment.

FIG. 16 (a) is a vertical sectional view of a conventional example. (B) It is a cross-sectional view of the above.

FIG. 17 is a cross-sectional view of another conventional example.

FIG. 18 is a side view of another conventional example.

[Explanation of symbols]

 1 Electromagnetic device main body 2 Opening part 3 Mounting part 6 Fixing screw 8 Case body 10 Case

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Katsunobu Hamamoto 1048, Kadoma, Kadoma, Osaka Prefecture Matsushita Electric Works Co., Ltd.

Claims (5)

[Claims] 1. A case including an electromagnetic device body having an iron core part, a mounting part attached to the electromagnetic device body for mounting the electromagnetic device body to a case, and the case, the case facing the electromagnetic device body. An electromagnetic device characterized in that an opening for noise reduction is formed in a part. 2. The opening is formed from a plurality of openings,
The electromagnetic device according to claim 1, wherein the case portion serving as a boundary between the openings that are adjacent to each other is a supporting portion in which the electromagnetic device body and the case are in contact with each other. 3. The electromagnetic device according to claim 2, wherein a damping material having a vibration damping property is interposed between the support portion and the electromagnetic device body. 4. The electromagnetic device according to claim 2, wherein a convex portion is formed on the surface of the supporting portion or the surface of the electromagnetic device body facing the supporting portion. 5. The position of the case other than the opening,
3. The electromagnetic device according to claim 1, wherein a corrugated metal plate having good thermal conductivity is interposed between the case and the main body of the device to which the case is attached.