JP2000195685A - Discharge lamp lighting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a discharge lamp lighting device having a structure requiring no sheath connection formed on the cover of a ballast, by simplifying an earth connecting structure. SOLUTION: A shield sheath 27 to cover output wires 23, 24 is fixed to a bus bar case 21 by using a clip 128, and among terminals 120, earth connection 120c connected to the earth side of a power source are protruded from the bus bar case 21, the bus bar case 21 is assembled to a metal base 122, and with a metal cover 111 mounted on the base 122, the cover 111, the clip 128, the earth connecting part 120c and the base 122 are connected for grounding by a screw 126.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a discharge lamp lighting device for lighting a high-pressure discharge lamp, which can be used, for example, as a headlight of a vehicle.

[0002]

2. Description of the Related Art Conventionally, in a lighting device (hereinafter, referred to as a ballast) for a high pressure discharge lamp (hereinafter, referred to as a lamp), a high voltage is applied by using a starter transformer at the start of lighting of the lamp. Then, the high voltage causes a capacitive discharge between the electrodes of the lamp to form an arc, and thereafter, the operation is shifted to stable lighting.

[0003] The present inventors have prototyped and studied the following ballast as such a ballast. FIG.
FIG. 6 is a diagram showing an assembling configuration of the ballast, and FIG.
It is a figure showing the electric schematic composition of a ballast. As shown in FIG. 6, the ballast boosts the voltage of a power supply (hereinafter referred to as a battery) 1 by a DC / DC converter 2 and converts the boosted voltage into an AC voltage by an inverter circuit 3 to turn on a lamp 4. It is configured as follows. At the start of lighting of the lamp 4, a high voltage is generated by the starter transformer 12 in the starting circuit 5, a capacitive discharge is formed between the electrodes of the lamp 4 to form an arc, and thereafter, the operation is shifted to stable lighting. The above circuits 2 to 5 are controlled by a control circuit (not shown).

As shown in FIG. 5, the ballast includes a cover (cover member) 11, a starter transformer 12, a thyristor 13, a capacitor 14,
A hybrid IC (hereinafter, referred to as an HIC) 19 in which the transformer 15, the capacitors 16, 17, the inductor 18, the inverter circuit 3, and the circuit elements of the control circuit that constitute the C / DC converter 2 are integrated, and circuit elements 13 to 18
20, a resin busbar case (case member) for electrically connecting various circuit elements such as the HIC 19 and the like.
21 and a base (base member) 22.

[0005] The terminal 20 is integrally formed by insert molding with a bus bar case 21. After the circuit elements 13 to 18 are attached to the bus bar case 21, they are connected to the terminal 20 by welding, soldering, or the like. The HIC 19 is attached to the base 22, and after the bus bar case 21 is adhered to the base 22, each terminal of the HIC 19 and the terminal 20 are connected by wire bonding. And the above-mentioned HIC1
9, a terminal 20, and a bus bar case 21 constitute a circuit unit for controlling lighting of the lamp 4. Output lines 23 and 24 are connected between the circuit and the lamp 4. The output lines 23 and 24 are fixed to the bus bar case 21 by grommets 25 as shown in the figure.

In the above configuration, the terminal 20
Is in the connector portion 21a of the bus bar case 21.
Connected to wiring from battery 1. Here, the terminal 20 is a terminal unit 20 connected to the positive electrode side of the battery 1.
a and a terminal portion 20b connected to the negative electrode side of the battery 1, that is, the ground side, and the terminal portion 20b is further connected to a ground connection portion 20c for grounding the ballast. Then, the bus bar case 21 and the base 22 are screwed together with screws 26 at the ground connection portion 20c, so that the ground connection portion 20c and the base 22 are fixed.
Is grounded. The cover 11 is assembled to the base 22 with screws (not shown). By this assembling, the cover 11 is grounded to the ground connection portion 20c via the base 22.

FIG. 7 shows a base 22 and a busbar case 2.
1 shows a state where the cover 11 is assembled. Cover 11,
The base 22 has a semi-ring-shaped sheath connection portion 11a,
2a is formed. The output wires 23 and 24 are covered with a shield sheath (shield member) 27 made of a conductor.
A clip (fixing member) 28 is fixed to the outer periphery of 22a. As a result, the shield sheath 27 is grounded to the ground connection portion 20c via the base 22 and the cover 11.

The cover 11 and the base 22 are housing members for housing the circuit section, and are made of metal for the purpose of measures against radiation noise, and they are manufactured by die casting. The present inventors have conducted intensive studies on the prototypes described above. In the above configuration, the terminal 20
The base 22 and the cover 11 are grounded by screwing between the ground connection portion 20c and the base 22, and the shield sheath 27 is clipped to the sheath connection portion 11.
a, the shield sheath 27 is grounded to the ballast main body, the ground connection is bulky and takes a lot of man-hours, and the cover 11 is formed with the semi-ring-shaped sheath connection portion 11a. 11 also needs to be manufactured by die casting, and there is a problem that the cost is increased.

Therefore, an object of the present invention is to simplify the ground connection structure. Another object of the present invention is to provide a structure that does not require a sheath connection portion to be formed on a cover member.

[0010]

In order to achieve the above object, according to the first aspect of the present invention, a ground connected to a ground side of a power supply among wiring members in a state where a circuit portion is stored in a storage member. The connection part, the shield member, and the storage member are configured to be grounded at one place.

According to the present invention, since the ground connection can be made at one place, a discharge lamp lighting device with a simplified ground connection structure can be provided. In this case, the shield member can be provided via a fixing member that fixes the shield member to the case member, as in the second aspect of the present invention. According to the third aspect of the present invention, the shield member is fixed to the case member using a fixing member, and the circuit member and the cover member are assembled to the base member. The ground connection portion connected to the side, the fixing member, and the base member are connected to the ground by screwing.

According to the present invention, the ground connection structure can be simplified as in the first aspect of the present invention, and the shield member is fixed to the case member. There can be no structure. This makes it possible to produce a metal cover by pressing. In this case, as in the invention according to claim 4, a screwing portion is provided on the base member, and the ground connection portion, the fixing member, and the cover member are configured so as to be screwable with the screwing portion. Can be.

According to a fifth aspect of the present invention, the shield member is fixed to the case member by using a clip, and a ground connection portion of the terminal connected to the ground side of the power source is projected from the case member. A structure in which the circuit member is assembled to the base member, and furthermore, the cover member, the ground connection portion, the clip, and the base member are connected to the ground by screwing in a state where the cover member is attached to the opened portion of the base member. It is characterized by doing.

[0014] The present invention also has the same effect as the third aspect of the invention.

[0015]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing a first embodiment of the present invention. FIG. 1 shows a ballast assembly configuration showing one embodiment of the present invention. In this figure, FIG.
Are denoted by the same reference symbols as the same or equivalent. The electrical configuration of the ballast is the same as that shown in FIG.

In this embodiment, the ballast cover (metal cover member) 111 is a flat plate having a plurality of protrusions 111a and a screw mounting portion 111b on the outer periphery. It has been produced. The base (metal base member) 12
2 is basically the same as that shown in FIG. 5 and has a box shape with an opening at the top, but has a screwed portion (the opposite side to the one housing the bus bar case 21) projecting outward. This is different from the one shown in FIG. 5 in that it has an internal thread 122a) and is formed with an opening 122b for allowing the shield sheath 27 to be taken out. The base 122 and the cover 111 constitute a metal housing member for housing the circuit section.

In this embodiment, the shield sheath 27 is fixed to the bus bar case 21 by a clip (fixing member) 128. That is, as shown in FIG. 2, the distal end of the shield sheath 27 is fitted into the protruding portion 25 a of the grommet 25 attached to the bus bar case 21, and then the distal end is fixed to the grommet 25 by the clip 128.

A terminal (wiring member) electrically connected to various circuit elements for controlling lighting of the lamp 4.
Reference numeral 120 denotes a terminal portion having a shape as shown in FIG. 3 and a terminal portion 120a connected to the positive electrode side of the battery 1 and a terminal portion 1 connected to the negative electrode side of the battery 1, that is, the ground side.
20b and a ground connection portion 120c connected to the terminal portion 120b. As shown in FIG.
20a and 120b protrude inside the connector portion 21a of the bus bar case 21, and the ground connection portion 120c protrudes outside from the bus bar case 21 and is screwed.

In the above configuration, the ballast is assembled as follows. First, the circuit elements (electric components) 12 to 18 and the like are connected to the terminal 120 insert-molded in the bus bar case 21 by welding, soldering, or the like, and the bus bar case 21 is bonded to the base 122 to which the HIC 19 is attached. , HIC19 and terminal 120 are connected by wire bonding. Also,
The output wires 23 and 24 are connected to the terminal 120 by welding, soldering or the like, and the output wires 23 and 24 are fixed to the bus bar case 21 by the grommet 25.

Then, the shield sheath 27 is connected to the clip 1.
The grommet 25 is fixed to the grommet 25 using the cover 28, and then the cover 111 is attached from above the base 122 and assembled.
This assembling is performed by inserting a plurality of protrusions 111a provided on the cover 111 between the base 122 and the busbar case 21, and fitting holes formed in the protrusions 111a to protrusions (not shown) of the busbar case 21. .

Thereafter, the screw fixing portion 111 of the cover 111
(b) The screw attachment piece 128a of the clip 128, the ground connection part 120c of the terminal 120, and the screw part 122a of the base 122 are screwed using the screw 126. Thereby, the ballast having the external structure shown in FIG. 4 is completed. In this ballast,
The cover 111, the clip 128, the ground connection portion 120c of the terminal 120, and the base 122 are electrically connected and grounded. Therefore, the cover 111 and the base 122 are connected to the ground connection portion 120 of the terminal 120.
c, and the shield sheath 27 is connected to the clip 128 and the ground connection portion 1 of the terminal 120.
Grounded via 20c.

According to the above-described embodiment, the cover 11
1, base 122, ground connection 1 of terminal 120
Since the shield 20c and the shield sheath 27 are configured to be grounded at one location, the ballast can be easily assembled and the cost can be reduced. Further, since the shield sheath 27 is fixed to the bus bar case 21 in advance by the clip 128, the cover 111 does not need to be provided with a sheath connection portion. Can be achieved.

Although the bus bar case 21 is used as a mounting member for mounting circuit elements, a configuration using printed circuit board wiring may be used.

[Brief description of the drawings]

FIG. 1 is a diagram showing an assembling configuration of a ballast according to an embodiment of the present invention.

FIG. 2 is a view showing a state in which the shield sheath 27 is fixed to the bus bar case 21 with a clip 128.

FIG. 3 is a diagram showing a shape of a terminal 120.

FIG. 4 is a diagram showing an external configuration of a ballast according to an embodiment of the present invention.

FIG. 5 is a diagram showing an assembling configuration of a ballast that the present inventors prototyped earlier.

FIG. 6 is a diagram showing an electrical schematic configuration of the ballast shown in FIG. 1;

FIG. 7 is a diagram showing a state in which a shield sheath 27 is attached to a ballast body.

[Explanation of symbols]

11, 111 ... cover, 12 ... starter transformer, 13
... Thyristor, 14, 16, 17 ... Capacitor, 15 ...
Transformer, 18 ... inductor, 19 ... HIC, 20, 1
20: Terminal, 21: Busbar case, 22, 12
2 ... base, 23, 24 ... output line, 25 ... grommet,
26, 126: Screw, 27: Shield sheath, 28, 1
28 ... Clip.

Claims (5)

[Claims] 1. A circuit part comprising a wiring member connected to a power supply, and various circuit elements for controlling lighting of the high-pressure discharge lamp are connected to the wiring member, and between the circuit part and the high-pressure discharge lamp. An output line that connects the circuit member, a shield member that covers the output line, and a metal storage member that stores the circuit portion, wherein the circuit member is stored in the storage member, and A discharge lamp lighting device, wherein a ground connection portion connected to a ground side of the power supply, the shield member, and the housing member are connected to ground at one place. 2. The circuit section has a case member on which the various circuit elements are mounted, the shield member is fixed to the case member using a fixing member, and a ground connection of the shield member is A discharge lamp lighting device, which is performed via the fixing member. 3. A circuit part comprising a wiring member connected to a power supply, and various circuit elements for controlling lighting of the high-pressure discharge lamp are connected to the wiring member, and between the circuit part and the high-pressure discharge lamp. And a shield member for covering the output line; and a metal base member and a metal cover member for accommodating the circuit unit. A case member to be mounted, wherein the shield member is fixed to the case member using a fixing member, and the circuit member and the cover member are assembled to the base member, and the cover member and A ground connection portion connected to the ground side of the power supply among the wiring member, the fixing member, and the base member are connected to ground by screws. Lamp lighting device. 4. The base member has a screwing portion protruding outward, and the ground connection portion, the fixing member and the cover member have the circuit portion and the cover member assembled to the base member. The discharge lamp lighting device according to claim 3, wherein the discharge lamp lighting device is shaped so as to be screwed at the screwing portion. 5. A circuit section having a terminal connected to a power supply, and a circuit section having various terminals for controlling lighting of the high-pressure discharge lamp connected to the terminal, and connecting between the circuit section and the high-pressure discharge lamp. An output line, a shield member covering the output line, a box-shaped metal base member having an open top, and a plate-shaped metal cover member. It has a case member to be mounted, the shield member is fixed to the case member using a clip, and a ground connection portion connected to a ground side of the power source among the terminals protrudes from the case member. The circuit portion is assembled to the base member, and the cover member is attached to the open portion of the base member. A discharge lamp lighting device, wherein a continuation portion, the clip, and the base member are connected to ground by screwing.