JP3670144B2 - Discharge lamp lighting device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a discharge lamp lighting device mainly used for a vehicle headlamp, and more particularly to a discharge lamp lighting device in which components can be easily assembled.
[0002]
[Prior art]
A discharge lamp used for a vehicle headlamp requires a high voltage of about several tens of kV for lighting, and the lighting device boosts a power supply voltage to control a voltage supply to a transformer and a discharge lamp that generate the high voltage. It consists of a control circuit. FIG. 7 is a diagram showing an outline of a discharge lamp lighting device, in which 70 is a discharge lamp constituent part constituted by a discharge lamp and a lamp cover that protects the discharge lamp, and 70a is a high voltage that applies a high starting voltage to the discharge lamp. A lighting device unit including a voltage generation circuit and the like. Next, a conventional structure of the lighting device unit 70a will be described.
[0003]
FIG. 6 shows a configuration of a lighting device used in a conventional discharge lamp lighting device. In the figure, reference numeral 100 denotes a resin case in which a transformer unit 101 for generating a starting voltage is stored, and a resin is filled to insulate the peripheral part from the transformer unit 101. Reference numeral 102 denotes a high-voltage resistant cable that connects the transformer unit 101 and the discharge lamp, via which the starting voltage is transmitted to the discharge lamp. Reference numeral 103 denotes an electronic circuit board on which a control circuit for controlling generation of a high voltage by the transformer unit 101 and voltage supply to the discharge lamp is disposed. Separately from this, it is fixed to the bottom surface of the resin case 100 with fixing screws 104. A storage case 105 is generally made of an aluminum material in consideration of corrosion resistance and workability. The lighting device portion constituted by the resin case 100 and the electronic circuit board 103 is supported and fixed by a fixing screw 106 to a fixing portion 107 provided inside the storage case 105 via the electronic circuit board 103.
[0004]
As described above, the electronic circuit board 103 needs to be provided with a fixing space in order to be fixed to the storage case 105. In this fixing space, parts and circuit patterns cannot be arranged, and the board area is effectively used. I couldn't. In addition, screwing and fixing requires accuracy in assembling positions of each member, so that workability is poor, and the number of parts increases, which causes a problem in cost.
[0005]
Furthermore, the storage case 105 using a metal material having good thermal conductivity can release heat generated when the power supply voltage is boosted by the transformer 101 and heat during circuit operation to other members. Since the bad resin case 100 and the resin are thermally retained by the members and thermally expanded, a load is applied to the screw fixing portion with the electronic circuit board 103 to cause damage and cracks in the resin may occur. .
[0006]
[Problems to be solved by the invention]
Since the conventional discharge lamp lighting device is configured as described above, the electronic circuit board 103 constituting the lighting device section needs a space for screwing and fixing to the storage case 105, and the electronic circuit board area is effectively increased. There was a problem that it could not be used.
[0007]
In addition, fixing by screwing increases the number of parts, and further requires accurate positioning accuracy during assembly, resulting in poor workability.
[0008]
Furthermore, since the transformer unit 101 generates heat when a high voltage is generated and when the circuit is operated, the resin case 100 and the resin in which the transformer unit 101 is housed are thermally expanded, and a load is applied to the screw fixing portion with the electronic circuit board 103. There is a problem that the fixing portion is damaged, or cracks of the resin may occur.
[0009]
The present invention has been made to solve the above problems, and can be easily assembled without screwing and fixing, and can effectively utilize the area of the electronic circuit board. It aims at obtaining the discharge lamp lighting device provided with.
[0010]
[Means for Solving the Problems]
The discharge lamp lighting device according to the invention, the bottom surface of the resin case through the external electrode terminal of the transformer to be soldered to the electronic circuit board, are formed to extend laterally to the outer peripheral end portions of the tree butter case made Two support portions, a convex portion or a concave portion provided on one of the two support portions, a concave portion or a convex portion provided on the housing and fitting and fixing the convex portion or the concave portion of the support portion , provided in the housing, which the other support part of the two supporting portions and a fitting recess for fitting, the electronic circuit board is fixed to the bottom surface of the resin case by soldering the external electrode terminal It is.
[0011]
The discharge lamp lighting device according to the present invention is characterized in that a convex portion provided on a support portion or a casing has a tapered shape.
[0012]
The discharge lamp lighting device according to the present invention is characterized in that the other support portion of the resin case is fitted into a fitting recess in the housing by forming a stress relaxation gap in the end direction. is there.
[0013]
The discharge lamp lighting device according to the present invention is characterized in that a gap forming projection for receiving the electronic circuit board is provided on the inner bottom surface of the housing.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
An embodiment of the present invention will be described below.
Embodiment 1 FIG.
1A and 1B are diagrams schematically illustrating a discharge lamp lighting device according to Embodiment 1 of the present invention, in which FIG. 1A is a front view, FIG. 1B is a side view, and FIG. In the figure, 1 is a lamp cover for protecting a discharge lamp, 2 is a housing case (housing) that houses a lighting device component, 3 is a resin case that houses a transformer that generates a high voltage for lighting the discharge lamp, 4 Is an electronic circuit board on which a control circuit for controlling the generation of a high voltage of the transformer and the voltage supply to the discharge lamp is arranged, and these constitute the main part of the lighting device. Reference numeral 5 denotes a high voltage-resistant cable that connects the transformer and the discharge lamp and transmits the high voltage generated by the transformer to the discharge lamp. Reference numeral 6 denotes an upper cover of the storage case 2. Is intervened. The lighting device unit will be described in detail below.
[0015]
2 and 3 show the configuration of the lighting device portion of the discharge lamp lighting device according to Embodiment 1 of the present invention. In the figure, reference numeral 7 denotes a transformer portion made of a cylindrical transformer (transformer) 7a resin-molded in a resin case 3 with a resin or the like, and 7b denotes a cylindrical transformer 7a protruding through the bottom surface of the resin case 3 to the outside. The external electrode terminal 7c is a soldering portion (temporary fixing portion) in which the external electrode terminal 7b is inserted into a board hole provided in the circuit pattern of the electronic circuit board 4 and soldered and connected thereto. Reference numerals 8 and 9 are support portions formed by extending laterally at both ends of the outer periphery of the resin case 3, and 10 is a convex portion provided on the support portion 8 and has a tapered shape. Reference numeral 11 denotes a concave portion for fitting and fixing the convex portion 10, and is provided in the storage case 2. Note that the same parts as those in FIG.
[0016]
Next, an outline will be described.
The soldering portion 7c solders the insertion portion of the external electrode terminal 7b into the substrate hole of the electronic circuit board 4, and further bends the external electrode terminal 7b penetrating the substrate hole so that the tip portion is in contact with the circuit pattern. Soldering. As a result, the resin case 3, the resin, and the external electrode terminal 7 b are thermally expanded due to the heat generated by the transformer unit 7 and the circuit operation, and a tensile force is applied to the former soldering (stress is applied). Thus, even if damage occurs, electrical conduction and substrate support are achieved by the latter soldering. Further, the electronic circuit board 4 is temporarily fixed to the bottom surface of the resin case 3 only by the soldering portion 7c, and is not fixed by screwing in order to relieve stress during thermal expansion and simplify the assembly work. ing. The resin case 3 on which the electronic circuit board 4 is installed is inserted into the storage case 2 in the direction of the arrow shown in FIG. 2 and supported in the storage case 2 by the support portions 8 and 9.
[0017]
Next, an outline of assembly of the resin case 3 to the storage case 2 will be described.
FIG. 4 shows an outline of the storage case 2 after the resin case 3 is stored. (A) is a top view, (b) is a cross-sectional view taken along the line AA in (a), and (c) is an end face. FIG. 4D is a side view, and FIG. In the figure, reference numeral 12 denotes a support seat (fitting recess) that is recessed so that the support portion 9 of the resin case 3 fits. Reference numeral 13 denotes a gap (stress relaxation gap) formed in the end direction of the support portion 9 when the support portion 9 is fitted to the support seat 12. The same parts as those in FIG. 1 to FIG.
[0018]
Since the convex portion 10 provided on the support portion 8 has a tapered shape, the assembly position of the concave portion 11 in the storage case 2 can be easily determined. Since the opening and the peripheral surface of the convex portion 10 come into contact with each other, they are fitted and fixed without any difficulty. On the other hand, the support portion 9 is fitted to the support seat 12 in the storage case 2 so that both members are temporarily assembled. At this time, the depth of the storage case 2 is designed so that the distance from the electronic circuit board 4 can be secured so that the electronic circuit board 4 installed on the bottom surface of the resin case 3 does not contact the inner bottom surface of the storage case 2. Has been. Thereafter, the lamp cover 1 and the storage case 2 are fixed via the upper lid 6, and the discharge lamp lighting device is assembled. As described above, the resin case 3 and the electronic circuit board 4 can be assembled to the storage case 2 simply by fitting the support portions 8 and 9 of the resin case 3 into predetermined positions in the storage case 2. The mounting position is determined, and unlike the screw fixing that requires mounting position accuracy, the assembling work can be easily performed. Further, since the screw fixing is eliminated, the electronic circuit board 4 can be downsized and the board area can be effectively used.
[0019]
Further, since the gap 13 is formed in the end direction of the support portion 9, even if the resin case 3 and the resin undergo thermal expansion due to heat generation of the transformer and heat generation during circuit operation, the stress is relieved in the end direction. be able to.
[0020]
As described above, according to the first embodiment, the mounting position of the electronic circuit board 4 is determined simply by fitting the support portions 8 and 9 of the resin case 3 into predetermined locations in the storage case 2. Unlike screw fixing that requires mounting position accuracy, it is possible to easily perform assembly work. Further, since the fixing with screws is eliminated, there is an effect that the electronic circuit board 4 can be reduced in size and the board area can be effectively used.
[0021]
According to the first embodiment, since the convex portion 10 of the support portion 8 is tapered, the assembly position in the concave portion 11 in the storage case 2 can be easily determined, and the opening of the concave portion 11 can be determined. Since the portion and the peripheral surface of the convex portion 10 come into contact with each other, the fitting and fixing can be performed without any difficulty.
[0022]
According to the first embodiment, the support portion 9 of the resin case 3 and the support seat 12 in the storage case 2 are fitted to form the gap 13, so that the resin case 3 and the resin are thermally expanded. Stress can be relaxed in the end direction.
[0023]
Embodiment 2. FIG.
In the first embodiment, when the resin case 3 is stored, the depth of the storage case 2 is sufficiently large so that the electronic circuit substrate 4 does not contact the inner bottom surface of the storage case 2. Although designed, the second embodiment corresponds to the case where the support portions 8 and 9 of the resin case 3 are bent due to an unexpected situation.
[0024]
FIG. 5 is a side sectional view of a lighting device used in Embodiment 2 of the present invention. In the figure, 14 is a spacer (gap forming protrusion) provided on the inner bottom surface of the storage case 2. Note that the same parts as those in FIG. When the support portions 8 and 9 of the resin case 3 are bent due to an unexpected situation, the spacer 14 can be prevented from receiving the electronic circuit board 4 and coming into contact with the inner bottom surface of the storage case 2. Incidentally, the spacer 14 is installed so as to abut on a part of the electronic circuit board 4 where no component or circuit pattern is arranged.
[0025]
As described above, according to the second embodiment, since the spacer 14 is provided on the inner bottom surface of the storage case 2, even when the support portions 8 and 9 of the resin case 3 are bent due to an unexpected situation. An effect of preventing the circuit pattern of the electronic circuit board 4 from being short-circuited to the inner bottom surface of the storage case 2 can be obtained.
[0026]
【The invention's effect】
As described above, according to the present invention, the bottom surface of the resin case through the external electrode terminal of the transformer to be soldered to the electronic circuit board, extend laterally to the outer peripheral end portions of the tree butter case made form The two support portions, a convex portion or a concave portion provided on one of the two support portions, and a concave portion or a convex portion provided in the housing and fitting and fixing the convex portion or the concave portion of the support portion. provided in the housing, and a fitting recess other support portion of the two support portions are fitted, the electronic circuit board is fixed to the bottom surface of the resin case by soldering the external electrode terminal Therefore, the mounting position of the electronic circuit board is determined simply by fitting the support part of the resin case into a predetermined place in the housing, and it is easy to perform the assembly work unlike screw fixing that requires mounting position accuracy. That can be There is an effect capable of effective use of smaller and board area of the electronic circuit board from.
[0027]
According to the present invention, since the convex portion provided on the support portion or the casing is configured to have a tapered shape, the assembly position on the casing can be easily determined, and There is an effect that can be fitted and fixed without any problems.
[0028]
According to the present invention, since the other support portion of the resin case is configured to be fitted in the fitting recess in the housing by forming a stress relaxation gap in the end direction, the heat generation of the transformer and the circuit Even if the resin case or resin is thermally expanded due to heat generated during operation, the stress can be relaxed in the end direction.
[0029]
According to the present invention, since the housing includes the gap forming protrusion for receiving the electronic circuit board on the inner bottom surface portion, even if the support portion of the resin case is bent due to an unexpected situation, the circuit of the electronic circuit board This has the effect of preventing the pattern from shorting to the inner bottom surface of the housing.
[Brief description of the drawings]
1A and 1B are diagrams schematically illustrating a discharge lamp lighting device according to Embodiment 1 of the present invention, in which FIG. 1A is a front view, FIG. 1B is a side view, and FIG.
FIG. 2 is a perspective view showing a configuration of a lighting device portion of a discharge lamp lighting device according to Embodiment 1 of the present invention.
FIG. 3 is a perspective view showing the configuration of a resin case periphery used in the discharge lamp lighting device according to Embodiment 1 of the present invention, and a partial cross section is taken to show the internal configuration.
FIGS. 4A and 4B are diagrams schematically showing the periphery of a resin case used in the discharge lamp lighting device according to Embodiment 1 of the present invention, where FIG. 4A is a top view, and FIG. A sectional view along line A, (c) is an end view, (d) is a side view, and (e) is a side sectional view.
FIG. 5 is a side sectional view of the periphery of a resin case used in a discharge lamp lighting device according to Embodiment 2 of the present invention.
FIG. 6 is a perspective view showing a configuration of a lighting device used in a conventional discharge lamp lighting device.
7A and 7B are diagrams schematically illustrating a discharge lamp lighting device, in which FIG. 7A is a front view and FIG. 7B is a side view.
[Explanation of symbols]
2 Storage case (housing), 3 Resin case, 4 Electronic circuit board, 7a Cylindrical transformer (transformer), 7b External electrode terminal, 7c Soldering part (temporary fastening part), 8, 9 Support part, 10 Convex part , 11 recess, 12 support seat (fitting recess), 13
Gap (stress relief gap), 14 spacer (gap forming protrusion).

Claims (4)

A resin case storing a transformer for generating a high voltage for lighting a discharge lamp, an electronic circuit board on which an electronic circuit necessary for controlling the transformer is disposed, and a housing for storing the electronic circuit board and the resin case In a discharge lamp lighting device having:
An external electrode terminal of the transformer penetrating the bottom surface of the resin case and soldered to the electronic circuit board ;
Two support portions formed by extending laterally at both ends of the outer periphery of the resin case;
A convex portion or a concave portion provided on one of the two support portions;
A concave portion or a convex portion provided in the housing, for fitting and fixing the convex portion or concave portion of the support portion;
A fitting recess provided in the housing and into which the other of the two supporting portions is fitted ;
The discharge lamp lighting device , wherein the electronic circuit board is fixed to a bottom surface of the resin case by soldering the external electrode terminals . The discharge lamp lighting device according to claim 1, wherein the convex portion provided on the support portion or the casing has a tapered shape.   2. The discharge lamp lighting device according to claim 1, wherein the other support portion of the resin case is fitted in a fitting recess in the housing with a stress relaxation gap formed in an end direction thereof.   The discharge lamp lighting device according to claim 1, wherein the housing includes a gap-forming projection for receiving the electronic circuit board on the inner bottom surface portion.

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