JPH09298381A - Discharge lamp lighting circuit device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the leakage of noise by making the case body of conductive material, and covering the section excluding a cut or hole section where a high-pressure cord is positioned with a noise shielding member consisting of conductive material. SOLUTION: A discharge lamp lighting circuit 1 accommodates a circuit board mounted with electronic parts within a case 2 made of material having conductivity. A connection cord is led out of the case body 2. A cover 4 is made in plate form which has the same plane form and size as a bottom plate 5 of a box 3. A roughly U-shaped cut is made in the position a little to the front at the right flank of the cover 4. The case body 2 is charged with urethane resin 22 until it reaches the position a little under the top of a peripheral wall 6 of the box 3, covering a starter circuit board 20 and a ballast circuit board 21 from the bottom 5 of the box 3. Hereby, high frequency noise can be prevented from leaking to the outside.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to prevention of noise leakage in a discharge lamp lighting circuit device.

[0002]

2. Description of the Related Art A circuit device in which a circuit board on which electronic components are mounted is housed in a case body made of, for example, a substantially container-like synthetic resin or metal, and the opening is covered with a lid body made of the same material. There is. In such a circuit device, the case body is provided with a hole for leading out a cord and a notch for electrical connection with the outside.

[0003]

By the way, in the circuit device as described above, particularly in the discharge lamp lighting circuit device for supplying a high voltage to light the discharge lamp, high frequency noise (electromagnetic wave) leaking to the outside is generated. ) Is a problem. Therefore, the case body that houses the circuit board is made of metal, and the metal case body blocks high-frequency noise that tends to leak to the outside.

However, even if the case body is made of metal, since holes and cutouts for leading out the cords are indispensable in the case body, noise leaks out from the holes and the cutouts for leading out the cords. Incidentally, the cord lead-out hole or notch is generally covered with a synthetic rubber bushing or lid for waterproofing. However, it is assumed that the cord lead-out hole or notch is covered with the bushing or lid. However, noise leakage cannot be prevented.

[0005]

Therefore, in the discharge lamp lighting circuit device of the present invention, the case body is made of a conductive material, and the notch or hole for leading out the high voltage cord has a portion where the high voltage cord is located. The removed portion is covered with a noise shielding member made of a conductive material.

Therefore, since the high voltage cord of the discharge lamp lighting circuit device is entirely covered with the conductive material,
The high frequency noise generated in the discharge lamp lighting circuit device does not leak outside.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of a discharge lamp lighting circuit device of the present invention will be described below with reference to an example shown in the accompanying drawings.

FIGS. 1 to 7 show a first embodiment 1 of a discharge lamp lighting circuit device according to the present invention. The first embodiment 1 is a discharge lamp lighting circuit device according to the present invention including a ballast circuit and a ballast circuit. The present invention is applied to a discharge lamp lighting circuit device for a vehicle in which a starter circuit is housed in one case body 2.

Discharge lamp lighting circuit device (hereinafter, "circuit device")
Say. ) 1 is a rectangular box-shaped conductive material, for example, a case body 2 made of aluminum alloy die casting (ADC), in which a circuit board on which electronic components are mounted is housed. The case body 2 is composed of a container-shaped box body 3 that is open toward one side and has a substantially rectangular shape in a plan view, and a lid body 4 that covers the opening of the box body 3. And the case body 2
There are two connection cords, which will be described later, derived from the.

In the following description, when referring to the up, down, front, back, left and right directions, the up and down directions in FIG. 1 are the left and right directions, the left and right directions are the front and back directions, and the up and down directions in FIG. 2 are the up and down directions.

As shown in FIG. 2 and FIG. 3, the box body 3 is formed with a peripheral wall 6 which rises substantially vertically from the peripheral edge portion of the bottom plate 5 over the entire circumference and opens upward, and The depth is shallower than the length and the width, that is, the shape of the container is rectangular. A small step 6a facing outward is formed on the upper end surface of the peripheral wall 6 over the entire circumference.

The peripheral walls 6 are thickened at the four corners of the box body 3 so that screw holes 7a for fixing the lid body 4 to the box body 3 are formed.
Are formed, and boss portions 7, 7, ...
As shown in FIG. 3, a partition wall 8 having the same height as that of the peripheral wall 6 is formed inside the peripheral wall 6 in a substantially L shape from a position on the rear wall of the peripheral wall 6 toward the right side to a position on the front side toward the right side wall. Thus, the inside of the box body 3 is divided into two parts by the partition wall 8, and the starter circuit housing part 9 which is the right rear part and the ballast circuit housing part 10 which is the other part are formed. There is.

As shown in FIGS. 2 and 4, the lid 4 is formed in a substantially plate shape having substantially the same plane shape and size as the bottom plate 5 of the box body 3. Further, as shown in FIG. 4, a substantially U-shaped notch 12 is formed at a position near the front of the right edge of the lid body 4.

Further, screw insertion holes 13, 13, ... Are formed at the four corners of the lid body 4 corresponding to the positions of the boss portions 7, 7, ... Formed at the four corners of the box body 3, respectively. There is.

Then, the outer edge portion 14 of the lower surface 11a of the lid body 4
Is thicker than the other portions of the lid body 4 except the portion where the notch 12 is formed, and the outer edge portion 14 has a sealing groove 15 along the outer edge shape of the lid body 4. Are formed.

Furthermore, a circular opening 16 is provided at a position closer to the right side from the center of the lid 4. In addition, on the upper surface 11b of the lid 4, as shown in FIGS. 1 and 2, the standing wall 17 is doubled so as to surround the opening 16.
And 18 are concentrically provided, and the inner standing wall 17 protruding from the opening edge of the opening 16 is formed so that the protruding height from the upper surface 11b of the lid 4 is higher than that of the outer standing wall 18.
Then, the standing wall 17 has screw holes 19a, 1a that protrude toward the center of the opening 16 from three locations 120 degrees apart from each other.
Mounting earpieces 19, 19, 19 having 9a, 19a are formed.

The starter circuit housing 9 and the ballast circuit housing 10 in the case body 2 composed of the box body 3 and the lid body 4 having the above-mentioned structures are respectively mounted with appropriate electronic parts. 20 and a ballast circuit board 21 are housed and fixed to the bottom plate 5 of the box body 3 by an appropriate method. The circuit formed on the starter circuit board 20 includes a starting pulse generating circuit that applies a starting high-voltage pulse to the discharge lamp.

In the case body 2, as shown in FIG. 2, a sponge-like urethane resin 22 is placed on the bottom plate 5 of the box body 3.
From the starter circuit board 20 and the ballast circuit board 2
1 is filled up until it reaches a position slightly below the upper end of the peripheral wall 6 of the box 3. As will be described later, the urethane resin 22 is formed by filling a so-called gel state of a liquid (urethane gel) into the case body 2 and then curing it.

Further, cords 23, 23 and 24 for electrically connecting a discharge lamp and a battery as a power source (not shown) to the circuit boards 20 and 21, respectively.
24 are connected.

That is, the cords 23, 23 are high-voltage cords through which a high voltage flows, one end of which is connected to the starter circuit board 20, which is led out to the outside from the opening 16 of the lid 4, and the other end of which is shown in FIG. As shown, a connector 25 for connecting to the discharge lamp is connected.

In the middle portion of the cords 23, 23, the outer peripheral surface of a cylindrical tube made of synthetic resin such as synthetic rubber having flexibility and insulation is provided, for example, stainless steel (SUS) or the like. A tube body 26, which is a cover body of the cord, is fitted on the cord 23, which is covered with a metal mesh made of to block high frequency noise generated from the cords 23.

As shown in FIGS. 5 and 6, one end of the tube body 26 is fixed to the lid body 4 by using the holder 27 and the collar 28, and the other end portion is attached to the cords 23, 23 by appropriate taping. It is fixed.

The holder 27 made of a conductive metal such as cold rolled steel (SPCC) has a disk-shaped flange 29 and a substantially cylindrical shape protruding upward from a position eccentric from the center of the flange 29. Is formed integrally with a caulking portion 30 having a sawtooth shape with a plurality of notches formed in the upper end portion, and the flange 29 and the caulking portion 30.
And a flange 29 is provided with screw insertion holes 29a, 29a, 29a for inserting screws when the holder 27 is attached to the lid 4.

Further, the collar 28 is formed of a soft synthetic resin having insulation and heat resistance, and is prevented from coming off all around the outer peripheral surface of the fitting portion 31 having a substantially cylindrical shape near the upper end. And a flange 32 is integrally formed at the lower end of the fitting portion 31.

As shown in FIG. 6, the tube body 26 is fitted in the caulking portion 30 of the holder 27 from above and then passed through the hole of the holder 27 from below.
6 is fitted with the fitting portion 31 of the collar 28 and the tube body 2
6 is a crimping portion 30 of the holder 27 and a fitting portion 3 of the collar 28.
1, and then the caulking portion 3 of the holder 27
Holder 2 by crimping 0 to the tube body 26 side.
Fixed to 7.

Then, the flange 29 of the holder 27 is attached to the lid 4. That is, the flange 29 of the holder 27 to which the tube body 26 is fixed is butted against the upper end of the standing wall 17 of the lid body 4, and the screw insertion holes 29a, 29a, 2
Inserting the screws 33, 33, 33 into the 9a, the boss portions 19, 1
It is fixed to the lid body 4 by being screwed into the screw holes 19a, 19a, 19a of 9, 9 and at the same time, the tube body 26 and the lid body 4 (the case body 2) are electrically connected via the holder 27. Connect to.

As described above, the collar 28 is made of synthetic resin rather than metal. This is to prevent the collar 28 from coming into contact with the cord 28 to cause a short circuit or discharge if the insulating coating of the cords 23, 23 through which the high-voltage current flows is broken.

Further, one ends of the cords 24, 24 are connected to the ballast circuit board 21, and the case body 2 is provided with the notch 1 of the lid body 4.
A connector 34 that is led out of the case body 2 from a portion opened by 2 and is connected to a battery is connected to the other end. A flexible bushing 35 is fitted into the notch 12 of the lid 4 to close the opening and hold the cords 24, 24.

The starter circuit board 20 and the ballast circuit board 21 are electrically connected by a cord (not shown).

Next, the urethane resin 22 is put into the case body 2.
Will be described.

That is, first, a member such as the case body 2 that comes into contact with the urethane resin 22 is dried. This is because the urethane resin in the urethane gel state easily reacts with water.

Next, in order to prevent bubbles from forming in the urethane gel, the starter circuit board 20, the ballast circuit board 21, etc. are housed and fixed in the case body 2 in a reduced pressure atmosphere, and the cord 23, After 23, 24, and 24 are led out of the box body 3, the gel urethane resin 22 is poured into the box body 3 to the position shown in FIG. 2 (potting).

Then, after applying a liquid gasket using a silicone adhesive to the sealing groove 15 of the lid body 4, the opening of the box body 2 is covered and closed with the lid body 4, and the lid body 4 is screwed into the box body 3. Fix with a stop. The cords 23, 23 and 24, 24 are respectively the opening 16 and the notch 12 of the lid body 4.
And the outer peripheral edge portion 1 of the lid body 4 and the step portion 6a of the box body 3
4 and the sealing groove 15 are engaged.

Finally, in order to apply heat to cure the urethane gel, the case body 2 is placed in a curing oven and the temperature is 8 degrees Celsius.
When heat treatment is carried out at a temperature of 0 degree for 4 hours, the urethane gel is solidified into a sponge-like urethane resin as described above. The silicone adhesive applied as a liquid gasket to the sealing groove 15 of the lid 4 cures at room temperature, but also cures at a temperature of 80 degrees Celsius.

As described above, when the case body 2 is filled with the urethane resin 22 and each of the circuit boards 20 and 21 is enclosed in the urethane resin 22, the urethane resin absorbs the vibration, so that the violent vibration is generated. By each circuit board 2
It is possible to prevent the occurrence of cracks or the like in the soldered portions of the electronic components on the circuit boards 0 and 21 and disconnection, and the heat generated by the electronic components on the circuit boards 20 and 21 has a thermal conductivity higher than that of air. Since it is transmitted to the metal case body 2 by the good urethane resin 22, the heat dissipation inside the case body 2 is improved.

Then, as shown in FIG. 7, the circuit device 1 is attached to a headlamp 36 which is a vehicular lamp. The headlamp 36 uses a discharge lamp 37 as a light source. The discharge lamp 37 is attached to a reflecting mirror 39 arranged in a lamp body 38, and the discharge lamp 37 is connected to cords 23 and 23. The attached connector 25 is attached.

A fitting portion 40 is provided on the lower surface of the lamp body 38. The fitting portion 40 is provided with a rib 42 on the opening edge of the opening 41.
A fitting groove 43 is formed in the. The opening diameter of the opening 41 is slightly larger than the outer diameter of the standing wall 17 of the case body 2.

Therefore, the circuit device 1 has the headlamp 36.
In the fitting groove 43 in which the 0 ring 44 is fitted,
Are fitted and supported from below by a mounting holder 45, and are mounted by fixing the mounting holder 45 to the lamp body 38 with bolts (not shown).

As mentioned above, the standing wall 17 is the standing wall 18.
Since the protrusion height from the upper surface 11b of the lid body 4 is higher than that of the lid body 4, the upper end surface of the standing wall 17 is located further above the lower portion of the lamp body 38 and is located inside the lamp body 38 as shown in FIG. Even if the water droplets that have entered are collected in the lower portion of the lamp body 38, they will not enter the circuit device 1 through the opening 16 of the case body 2. Further, the water droplets collected in the lower portion of the lamp body 38 are located at a position lower than the lower portion of the lamp body 38 and the opening edge of the opening 41 and the standing wall 1.
It enters the gap between the circuit device 1 and 7, and is more difficult to enter in the circuit device 1.

Next, a modification of the method of fixing the tube body 26 to the case body 2 will be described with reference to FIGS. In this modification, instead of the collar 28, cold rolled steel (SPCC) or carbon tool steel (SK) has conductivity,
In addition, the coupler 50 made of a metal having elasticity is used.

In this modification, the tube body 2
Since the members other than the members used for fixing 6 to the case body 2 are the same members as those shown in the above-mentioned embodiment, the same reference numerals are given to the same parts in the above-mentioned embodiment. The description is omitted by giving the same reference numerals.

The coupler 50 is a main portion 51 having a substantially cylindrical shape.
And a holding portion 52 formed integrally from the lower end of the main portion 51.
It consists of and. Further, the main portion 51 is formed such that the outer diameter thereof becomes slightly smaller as the upper end portion goes upward, and a ridge 51a extending in the circumferential direction is formed on the outer peripheral surface near the upper end. In addition, the sandwiching portion 52
As shown in FIG. 8 and FIG. 9, originally, a substantially flange-shaped portion integrally formed from the lower end portion of the main portion 51 is directed obliquely upward, and then obliquely downward so that When viewed from below, the bending line is processed so as to draw a circle, that is, the bending line is bent so as to form a substantially crank shape. It should be noted that the sandwiching portion 52 is also formed with a ridge 52a that extends in the circumferential direction and projects toward the main portion 51 at a substantially intermediate position, and slits 53 that extend in radial directions at four positions at an angle of about 90 degrees from each other. , 53, ... Are formed.

The holder 54 made of metal such as cold rolled steel (SPCC) has a cylindrical connecting portion 55 and the connecting portion 5.
Screw hole 5 formed integrally so as to project from the lower end of
And a disc-shaped flange 56 having 6a, 56a, 56a.

Then, the tube body 26 is attached to the holder 54 as follows. First, the tube body 26 is fitted onto the main portion 51 of the coupler 50 from above. At this time, the protrusion 51a formed on the main portion 51 is
The strength of the tube body 26 is improved and the tube body 26 is prevented from coming off. Then, the coupler 50 together with the tube body 26 is attached to the connecting portion 5 of the holder 54 from the holding portion 52 side.
Press into 5. Then, in the sandwiching portion 52 of the coupler 50, the portions divided by the slits 53, 53, ... Are respectively bent to the tube body 26 side by the inner peripheral surface of the connecting portion 55 of the holder 54, whereby the tube The body 26 is sandwiched between the main portion 51 and the sandwiching portion 52 of the coupler 50, and at the same time, the ridges 52a of the sandwiching portion 52 bite into the metal mesh coating of the tube body 26, thereby making the tube body 26 stronger. It is held by the holder 54.

Then, the flange 56 of the holder 54 is attached to the lid 4. That is, the flange 56 of the holder 54 to which the tube body 26 is fixed is butted against the upper end of the standing wall 17 of the lid body 4, and the screw insertion holes 56a, 56a, 5
Insert the screws 33, 33, 33 into the 6a to insert the boss portions 19, 1,
9 and 19 are screwed into the screw holes 19a, 19a, 19a to be fixed to the lid body 4, and at the same time, the tube body 26 and the lid body 4 (case body 2) are interposed with the coupler 50 and the holder 54 interposed therebetween. Connect electrically.

In the modified example described above, as compared with the one shown in the first embodiment described above, the coupler 50 in which the tube body 26 is fitted on the main portion 51 is simply press-fitted into the holder 54. Since the tube body 26 can be attached to the holder 54 and caulking work is unnecessary,
There is an advantage that the work of fixing the tube body 26 to the case body 2 can be easily performed, which is advantageous in terms of cost.

Finally, the second embodiment of the discharge lamp lighting circuit device of the present invention.
Example 1A will be described with reference to FIGS. 11 to 13. The embodiment 1A is different from the embodiment described in the first embodiment in which the tube body is once fixed to the holder and then the holder is attached to the lid body. The tube body 26 is directly fixed to the.

Further, in the second embodiment 1A, a part of the lid of the case body and members other than the member used for fixing the tube body 26 to the case body are shown in the first embodiment. Since the same members as the members are used, the same reference numerals as those used for the same parts in the above-mentioned embodiment are given to the members, and the description thereof will be omitted.

The case body 2A made of a conductive metal such as aluminum alloy die cast (ADC) is composed of the box body 3 shown in the first embodiment and the lid body 4A.

As shown in FIGS. 11 and 12, the lid body 4A is formed in a substantially plate shape having substantially the same plane shape and size as the bottom plate 5 of the box body 3.

The lower surface 60a of the lid 4A has a wall thickness thicker than the other portions of the lid 4A except for the portion where the outer edge portion 14 is provided with the notch 12, and A sealing groove 15 is formed in the outer edge portion 14 along the outer edge shape of the lid body 4A.

A circular cord insertion hole 61 is provided at a position closer to the right side from the center of the lid 4A. Further, as shown in FIG. 12, a cylindrical portion 62 is provided on the upper surface 60b of the lid 4A along the opening edge of the cord insertion hole 61. The outer diameter of the tubular portion 62 is substantially the same as the inner diameter of the hole of the tube body 26. And
Similar to the standing wall 18 in the first embodiment, the tubular portion 6 is
2. A standing wall 63 is formed concentrically with the tubular portion 62 so as to surround the circumference of 2
Is provided. The standing wall 63 is formed so that the protruding height from the upper surface 60b of the lid 4A is slightly lower than that of the tubular portion 62.

The fixing ring 64 made of a conductive metal such as cold rolled steel (SPCC) is used as the tubular portion 6 of the lid 4A.
As shown in FIG. 13, the tube body 26 is fixed to the tube body 26. The shape of the tube body 26 is a short cylindrical shape, and the one end portion 64a is provided with a large number of notches and is formed in a sawtooth shape. It is said to be the caulking part.

Therefore, using the fixing ring 64,
The tube body 26 is attached to the lid body 4A as follows. That is, first, the tube body 26 is externally fitted (press-fitted) into the tubular portion 62 of the lid body 4A.

Then, the fixing ring 64 is attached to the tube body 26.
The other end 64b on the side opposite to the crimping portion 64a.
The outer ring 64 is externally fitted toward the upper surface 60 side of A, and as shown in FIG. 12, the fixing ring 64 is moved onto the part of the tube body 26 which is externally fitted around the tubular portion 62, so that the other end 64b. After making the end face of the contact with the upper surface 60b of the lid 4A, the crimp portion 64a is crimped to the tube body 26 side. Then
The tube body 26 includes the tubular portion 62 of the lid body 4A and the fixing ring 6.
It is sandwiched by 4 and fixed to the lid 4A, and at the same time,
The tube body 26 and the lid body 4A (the case body 2A) are electrically connected to each other via the fixing ring 64 that is in contact with the upper surface 60b of the lid body 4A.

Thus, as schematically shown in FIG.
The circuit device 1A includes a headlamp 36 and a lamp body 38.
The cylindrical portion 62 is located in the opening 41 of the above, the standing wall 63 is fitted in the fitting groove 43, and is supported from below by the mounting holder 45, and the mounting holder 45 is fixed to the lamp body 38 by a bolt (not shown). Mounted by.

As described above, the tube body 26 is attached to the lid body 4.
When it is directly fixed to the tubular portion 62 formed in A, the member necessary for fixing the tube body 26 is the fixing ring 6
4, the holders 27 and 54 shown in the first embodiment and the modification are not required, the number of parts can be reduced, and the cord insertion hole 61, which is a cord lead-out hole, can be made small. The noise shielding property is further improved at the derived portion of the high voltage cord. Further, the tube body 26 is fixed by simply fitting the tube body 26 onto the tubular portion 62 of the lid body 4A, and then fitting the fixing ring 64 onto the tubular portion 62 from above, and caulking the circuit body 1A. It also contributes to simplification of the assembly process.

The circuit device shown in each of the above embodiments has a starting pulse generating circuit for generating a high voltage pulse with a large emission amount of high frequency noise in the circuit formed on the starter circuit board. The circuit device of the present invention can effectively shield the leakage of high frequency noise to the outside even with such a circuit that emits a large amount of high frequency noise.

[0059]

As is apparent from the above description, in the discharge lamp lighting circuit device of the present invention, the circuit board on which the electronic parts are mounted is housed in the case body, and the high voltage for connecting the circuit board and the discharge lamp. A discharge lamp lighting circuit device having a cord, wherein the case body is provided with a notch or a hole for leading out the high-voltage cord to the outside, wherein the case body is made of a conductive material, and It is characterized in that the cutout or the hole is covered with a noise shielding member made of a conductive material, except for the portion where the high-voltage cord is located.

Therefore, since the circumference of the high voltage cord of the discharge lamp lighting circuit device is entirely covered with the conductive material,
The high frequency noise generated in the discharge lamp lighting circuit device does not leak outside.

It should be noted that the specific shapes and structures shown in the above-mentioned embodiments are merely examples of the implementation in carrying out the present invention, and the technical scope of the present invention is limited thereby. Must not be interpreted as.

[Brief description of drawings]

1 shows a first embodiment of a discharge lamp lighting circuit device of the present invention together with FIGS. 2 to 7, and is a plan view.

FIG. 2 is a sectional view taken along line II-II in FIG.

FIG. 3 is a plan view of a box.

FIG. 4 is a bottom view of the lid.

FIG. 5 is an exploded perspective view showing an attachment means of the high-voltage cord in an enlarged manner.

FIG. 6 is an enlarged side view showing a high voltage cord.

FIG. 7 is a cross-sectional view schematically showing a state of being attached to a vehicle lamp.

FIG. 8 is a view showing a modified example of the means for attaching the tube body to the lid body together with FIGS. 9 and 10, and this figure is a schematic exploded perspective view.

FIG. 9 is an enlarged cross-sectional view showing a process of attaching the tube body to the holder.

FIG. 10 is an enlarged cross-sectional view showing a state in which the coupler is attached to the holder.

FIG. 11 shows a second embodiment of the discharge lamp lighting circuit device of the present invention together with FIGS. 12 and 13, and is a plan view.

12 is an enlarged sectional view taken along line XII-XII in FIG.

FIG. 13 is a perspective view of a fixing ring.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Discharge lamp lighting circuit device, 2 ... Case body, 16 ... Hole (opening), 20 ... Circuit board, 21 ... Circuit board, 20 ... Resin, 23 ... High voltage cord, 26 ... Noise shielding member (tube body), 27 ... Noise shielding member (holder), 36 ... Vehicle lamp (headlamp), 37 ... Discharge lamp, 38 ... Lamp body, 50 ... Noise shielding member (coupler), 54 ... Noise shielding member (holder), 1A ... Electric lighting circuit device, 2
A ... Case body, 61 ... Groove (cord insertion hole), 64 ... Noise shielding member (fixing ring)

[Procedure amendment]

[Submission date] July 3, 1996

[Procedure amendment 1]

[Document name to be amended] Drawing

[Correction target item name] All figures

[Correction method] Change

[Correction contents]

FIG.

[Fig. 2]

[Figure 3]

[Figure 5]

FIG. 4

FIG. 6

FIG. 7

[Figure 9]

FIG. 13

[Figure 8]

FIG. 10

FIG. 11

FIG.

Claims (5)

[Claims] 1. A case is provided with a circuit board on which electronic components are mounted, and a high-voltage cord is provided for connecting the circuit board to a discharge lamp. Is a discharge lamp lighting circuit device provided with a notch or a hole, wherein the case body is made of a conductive material, and the part of the notch or the hole except the part where the high-voltage cord is located is made of a conductive material. A discharge lamp lighting circuit device, wherein the discharge lamp lighting circuit device is covered with a noise shielding member. 2. The discharge lamp lighting circuit device according to claim 1, wherein the circuit formed on the circuit board has a starting pulse generating circuit for applying a high voltage pulse for starting to the discharge lamp. 3. The high-voltage cord is covered with a cover body made of a material containing a conductive material, and the cover body is electrically connected to the case body. The discharge lamp lighting circuit device according to. 4. A discharge lamp is used as a light source of a vehicular lamp, an opening is provided in a lamp body of the vehicular lamp, and a high-voltage cord drawn from a case body is inserted into the opening, and a case is provided. The discharge lamp lighting circuit device according to claim 1, wherein the body is attached to the lamp body such that a part of the case body enters the inside of the lamp body through the opening. . 5. The discharge lamp lighting circuit device according to claim 4, wherein a gap is provided between an opening edge of the opening of the lamp body and a portion of the case body that is inside the lamp body. .