JPH0646012Y2 - Discharge lamp lighting device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial field of application) The present invention relates to a discharge lamp lighting device including an electronic ballast built into a lighting fixture, and in particular, an arrangement structure of electromagnetic equipment. Regarding

(Prior Art) An example of a conventional electronic ballast will be described with reference to FIGS. 7 and 8.

The metal case 1 is composed of a lower case member 2 and an upper case member 3, and a printed circuit board 4 is fixedly supported on the lower surface of the lower case member 2. The printed circuit board 4 is supported so as to be slightly separated from the lower surface portion of the lower case member 2 by, for example, a board fixing convex portion 5 formed by cutting and raising the lower surface portion of the lower case member 2. Then, the transformer 6 which is an electromagnetic device and the other discrete electronic component 7 are mounted on the printed circuit board 4. These transformer 6 and electronic component 7
The lead protruding downward penetrates the printed circuit board 4 and is soldered to the conductive pattern surface thereof. In order to maintain the insulation between the lead and the lower case member 2,
An insulating paper 8 is arranged on the lower case member 2. In particular, the transformer 6 has a structure in which the leads are insulated from the lower case member 2 as described above, and also insulated by maintaining a spatial distance from the upper case member 3. A terminal block 9 for connecting an electric wire from the outside is mounted on the printed circuit board 4 located outside the upper case member 3.

(Problems to be solved by the invention) By the way, since the electromagnetic device such as the transformer 6 or the choke is generally larger than the other electronic components 7, the height of the case 1 depends on the height of the electromagnetic device. The size is limited and the height of the discharge lamp lighting device is fixed. However, in the above-described conventional structure, the transformer 6, which is an electromagnetic device, is mounted on the printed circuit board 4, and the spatial distance is maintained between the transformer 6 and the upper surface portion of the upper case member 3. There is a problem that the height of the discharge lamp lighting device becomes high.

Further, electromagnetic equipment that is relatively easy to generate heat can be downsized by reducing the temperature rise value. However, in the above-described conventional structure, the heat of the transformer 6 is not effectively dissipated.
It was necessary to use a large transformer 6 having a large heat capacity. As a result, the discharge lamp lighting device has become even larger.

On the other hand, there are market demands for shorter size, thinner size, and lighter weight.
A design issue is how to make the discharge lamp lighting device compact.

The present invention is intended to solve such a problem,
An object of the present invention is to provide a discharge lamp lighting device that can effectively dissipate heat from an electromagnetic device and therefore can reduce the size of the electromagnetic device, and that is also small in size and particularly low in height.

[Constitution of device]

(Means for Solving the Problem) The present invention comprises a case made of metal or the like, a circuit board built in the case, and an electromagnetic device such as a transformer or a choke having an iron core part built in the case. In order to achieve the above object, in the discharge lamp lighting device, an opening is formed in a part of the circuit board, the electromagnetic device is disposed in the opening, and the electromagnetic device is buffered with an iron core part. The inner surface of the case is brought into contact with an object.

(Operation) In the discharge lamp lighting device of the present invention, the electromagnetic device is arranged in the opening formed in the circuit board, and the iron core of the electromagnetic device is brought into contact with the inner surface of the case through the cushioning material to cause electromagnetic interference. It is designed to reduce the size of the case that houses the equipment and circuit board, especially to reduce the height. Since the cushioning material is interposed between the inner surface of the case and the iron core portion of the electromagnetic device, the iron core portion surely contacts the inner surface of the case even if the dimensions of the parts vary. Then, at the time of operation, the heat generated by the electromagnetic device is conducted from the iron core portion to the case via the buffer and is radiated to the outside of the case.

(Embodiment) The construction of one embodiment of the discharge lamp lighting device of the present invention will be described below.
A description will be given with reference to FIGS. The device of this example is an electronic ballast.

Reference numeral 11 denotes a case. The case 11 includes a lower case member 12 and an upper case member fixedly coupled to the lower case member 12.
It has a rectangular cross section and is formed in a rectangular tube shape with both front and rear end surfaces open. It should be noted that mounting holes 14 through which fixing screws for mounting a lighting fixture to a chassis or the like are inserted are formed at both front and rear ends of the lower surface of the lower case member 12. Then, a lower insulating paper 15 and an upper insulating paper 16 as cushioning materials are attached to the inner surfaces of the case members 12 and 13 having a substantially U-shaped cross section. These insulating papers 15 and 16 have insulation and have elasticity to some extent.

A printed circuit board 17 is built in the case 11. The printed circuit board 17 is fixedly supported substantially parallel to the lower surface of the lower case member 12 and with a slight gap between the lower surface and the lower surface. And the printed circuit board
An opening 18 is formed in a part of the middle of 17.

Various electronic components 21 are mounted on the printed circuit board 17. In these electronic components 21, the leads 22 protruding downward are penetrated through the printed circuit board 17 and soldered to the conductive patterns thereof. In particular, the printed circuit board 17
Terminal blocks 24, to which lead wires 23 from the outside are connected, are mounted on both front and rear ends, respectively. These terminal blocks 24
Is the case 11 by an appropriate means such as a fixing projection 25 formed by cutting and raising the lower surface of the lower case member 12 or a screw.
Is also fixedly supported, and supports the printed circuit board 17. Further, lead wire insertion holes 26 are formed in the outer end surface portions of the terminal blocks 24 located on the open end surface of the case 11. The electronic component 21 and the terminal block 24
The leads 22 such as are insulated from the lower case member 12 from metal or the like by the lower insulating paper 15.

31 is a transformer as an electromagnetic device. This transformer 31 is
The coil 33 includes a coil 33 wound around a coil bobbin 32, a ferrite core 34, and a plurality of lead pins 35 electrically connected to the coil 33. Both ends of the iron core portion 34 project above and below the coil bobbin 32 in the drawing, and the opening 18 of the printed circuit board 17 is formed.
And the planar shape thereof are substantially equal to each other, and the lower portion is fitted into the opening 18. The lead pin 35 projects downward from a lower flange of the coil bobbin 32 joined to the printed circuit board 17, and penetrates the printed circuit board 17 to be soldered to its conductive pattern. The upper and lower end surfaces of the iron core portion 34 are the case 11
The lower insulating paper 15 and the upper insulating paper 16 on the upper and lower surfaces of the inside are in close contact with each other. Thus, the transformer
31 is directly pressed by the upper and lower case members 12 and 13.

Next, the operation of the above embodiment will be described.

When operating as an electronic ballast, the transformer in case 11
The heat generated by 31 is conducted to the case 11 from the iron core portion 34 of the transformer 31 via the insulating papers 15 and 16, and is positively released to the outside of the case 11. At this time, the iron core portion 34 is in direct contact with the inner surface of the case 11 only through the insulating papers 15 and 16, and air having extremely poor heat conductivity is conventionally provided between the iron core portion 34 and the case 12. Is not present, heat dissipation is effectively performed. Specifically, the temperature rise value can be reduced by about 5 to 15 deg. Therefore, in manufacturing, it is possible to use a small transformer 31 having a small heat capacity.

Further, according to the above configuration, the transformer 31 that limits the height dimension of the case 11 is not arranged on the printed circuit board 17, but is arranged on the opening 18 formed on the printed circuit board 17. Since it is installed and housed between the upper and lower case members 12 and 13 without a gap, the transformer 31 and the printed circuit board 17 can be downsized together with the fact that the transformer 31 can be miniaturized due to good heat dissipation as described above. The built-in case 11 can be downsized, and its height can be greatly reduced.

Further, since the insulating papers 15 and 16 having elasticity are interposed between the iron core portion 34 of the transformer 31 and the upper and lower surfaces of the case 11, even if there are variations in component dimensions, the case 31
There is no gap between the inner surface of the core and the core 34, and the core 34 reliably contacts the case 31. At the same time, the interposition of the insulating papers 15 and 16 brings effects such as preventing generation of a growl noise due to the vibration of the transformer 31 in operation, and prevention of damage due to an impact applied to the discharge lamp lighting device from the outside.

The cushioning material to be interposed between the iron core portion 34 of the transformer 31 and the inner surface of the case 11 is the insulating paper 15, 16 of the above embodiment.
Besides, an insulating plate such as a rubber sheet, an adhesive by coating or a prepreg material can be used as a material. Further, the buffer may be made of a conductor.

By the way, in order to enhance the heat radiation effect of the transformer 34, the material of the case 11 is preferably made of metal. However,
If the case 11 is extremely thin as described above, the first
As shown in the figure, among the electronic components 21 other than the transformer 34, one having the full size of the case 11 comes out in the height direction. Therefore, when the case 11 is made of metal as described above, some of the electronic components 21 have a short insulation distance from the inner surface of the case 11.
It is necessary to interpose an insulator between the inner surface of 11 and the electronic component 21.

On the other hand, in the above-described embodiment, the insulating papers 15 and 16 that are the buffers for the transformer 31 are extended and the same insulating papers 15 and 16 are used.
Is used not only as the transformer 31 but also as an insulator for other electronic components 21, thereby improving the assembly workability and the like.

The opening of the printed circuit board where the transformer is installed is
As shown in FIG. 4, it may be formed as an independent hole inside the printed circuit board 17, but as shown in FIG. 5, a concave notch is formed in the side portion of the printed circuit board 41. The notch may be used as the opening 42. Also printed circuit board 4
Divided 3,44 into two, these printed circuit boards divided
The gap between 43 and 44 may be the opening 45.

Further, in the above embodiment, the electromagnetic device is the transformer 31, but the electromagnetic device may be a choke or the like. Also,
The iron core portion of the electromagnetic device is not limited to the ferrite iron core, and may be a laminated iron core or an amorphous iron core.

[Effect of device]

According to the present invention, an opening is formed in a part of a circuit board contained in a case, and an electromagnetic device is arranged in the opening.
Since the iron core of this electromagnetic device is brought into contact with the inner surface of the case via a buffer, the heat generated by the electromagnetic device is effectively dissipated through the case, so that the electromagnetic device has a small heat capacity. In addition to the fact that it is possible to use, it is possible to make the case small, especially thin.

[Brief description of drawings]

FIG. 1 is a longitudinal sectional view showing an embodiment of the discharge lamp lighting device of the present invention, FIG. 2 is an external perspective view of the same as above, FIG. 3 is an enlarged view of the electromagnetic equipment portion of FIG. 1 above, and FIG. Same as above, a plan view of a printed circuit board, FIG. 5 is a plan view of a printed circuit board showing another embodiment of the present invention, and FIG. 6 is a plan view of a printed circuit board showing still another embodiment of the present invention. FIG. 7 is a vertical sectional view showing an example of a conventional discharge lamp lighting device, and FIG. 8 is an external perspective view of the same. 11 …… Case, 15 …… Top insulating paper as a buffer, 16 ……
Lower insulating paper as a buffer, 17 …… printed circuit board, 18 ……
Opening part, 31 ... Transformer as electromagnetic equipment, 34 ... Iron core part, 41 ... Printed circuit board, 42 ... Opening part, 43,44 ... Printed circuit board, 45 ... Opening part.

Claims (1)

[Scope of utility model registration request] 1. A case, a circuit board built in the case, and an electromagnetic device having an iron core part built in the case, wherein an opening is formed in a part of the circuit board, and the opening is formed. The discharge lamp lighting device according to claim 1, wherein the electromagnetic device is disposed in the casing, and an iron core portion of the electromagnetic device is brought into contact with the inner surface of the case via a buffer.