JP2002109951A - Discharge lamp lighting device and lighting equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a discharge lamp lighting device which is easy to miniaturize, and reduce the thermal effect from a discharge lamp to the lighting device, and gives little thermal stress caused by the heat generated by the lighting device itself, to electronic components, and to provide a lighting equipment. SOLUTION: The discharge lamp lighting device comprises a discharge lamp 2 as a light source, a reflection mirror 3 with an opening 3a at one end, controlling a light distribution by surrounding the circumference of the discharge lamp 2, a lighting device 6 connected electrically to a socket 4 for mounting the light source and controlling the lighting of the discharge lamp 2, and a case 5 with frontal opening, supporting the reflection mirror 3, for the parts mounted on a circuit board 61 housed in the lighting device 6, the parts having high heat value by itself are mounted on the upper side of the case 5, and the parts liable to deteriorate by heating are mounted on the lower side of the case 5. The lighting device 6 is covered by a covering member 7, and mounted along a backside plate 51 of the case 5 so as to protrude from backside surface.

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 and an illuminating device using a discharge lamp such as an HID lamp used for store lighting, automobile headlights and the like as a light source.

[0002]

2. Description of the Related Art In recent years, replacement of incandescent lamps with high-pressure discharge lamps such as HID lamps has been progressing from the viewpoints of energy saving and long life in lighting devices for stores and vehicle lighting devices such as vehicle headlights. I have. This high-pressure discharge lamp requires a ballast as a lighting device. Conventionally, the ballast includes a copper iron type and an electronic type. Electronic ballasts are often used in the above-mentioned lighting devices because of their small size and light weight.

[0003] Electronic ballasts are often provided integrally with lighting devices, taking advantage of their small size and light weight. By the way, the electronic components constituting the lighting circuit of the electronic ballast have thermal restrictions in use conditions. For example, F
Semiconductors such as ET generally have an upper limit of the semiconductor junction temperature of about 150 ° C., and electrolytic capacitors generally have a 10 ° C. double ratio depending on the temperature conditions of the use environment. It is known that lifespan is halved. That is, when the use environment temperature rises by 10 ° C., the capacity of the electrolytic capacitor decreases at a speed of about twice due to deterioration of the electrolyte of the electrolytic capacitor.

A conventional discharge lamp lighting device 10 shown in FIG.
0, the lighting device is a discharge lamp 101 serving as a light source.
A lighting device that electrically connects to a reflector 103 having an opening on one side for light distribution control surrounding the discharge lamp 101 and a light source mounting socket 103 and controls lighting of the discharge lamp 101 An electronic ballast to which a power supply is connected, which corresponds to 105, and a housing 104 having a front opening supporting the reflecting mirror 102 are provided. This discharge lamp lighting device 100
When a power supply voltage is applied to the lighting device 105, the discharge lamp 101 is lit to emit light.
Of the discharge lamp lighting device 1
The light distribution is controlled to illuminate the front side of 00.

In this case, the lighting device 105 has a configuration shown in the circuit example of FIG. 7, and includes a DC-DC converter 106 and a low-frequency inverter 1 as circuit blocks of the lighting circuit.
07, an igniter 108, and a control circuit 109. The DC-DC converter 106 includes a power supply E
1 to convert the power supply voltage to the load voltage and control the load power. The low frequency inverter 107 enables rectangular wave lighting by alternating the polarity of the voltage to the discharge lamp 101 at a low frequency. The igniter 108 causes dielectric breakdown between the electrodes of the discharge lamp 101 when the power is turned on, so that the discharge lamp 101 is turned on.

The above circuit block comprises an electrolytic capacitor C
1, formed by passive components such as a film capacitor C2 and a transformer T1, active components such as FETs Q1 to Q5 as switching elements, and a control circuit 109 formed of an IC or the like for controlling and driving the active components. . And FIG.
As shown in (a), it is attached to the lower part of the housing 104 so as not to receive heat generated by the discharge lamp 101. In other words, of the energy supplied to the discharge lamp 101 from the lighting device 105, the energy that does not become light becomes heat in the discharge lamp and the temperature around the discharge lamp 101 becomes considerably high. This is for keeping away from this high temperature condition.

[0007]

However, in the configuration of the above-mentioned prior art in which heat from the discharge lamp 101 is hardly received as shown in FIG. 8A, the lighting device 105 is provided outside the housing 104. However, there are drawbacks such as poor handling properties and a relatively large outer shape of the lighting device itself.

The discharge lamp lighting device 1 shown in FIG.
When the lighting device 105 is installed inside the housing 104 as shown in FIG. 10, the handleability of the lighting device is improved, but the influence of the heat generated by the discharge lamp 101 on the lighting device 105 is reduced. It is necessary to arrange the lighting device 105 away from the discharge lamp 101. Therefore, there has been a defect that the housing 104 itself becomes larger. That is, according to this configuration, there is a problem that the entire lighting device becomes large.

By the way, in order to improve the waterproofness of the lighting device, it is sometimes desired that the housing 104 has a closed structure closed from the outside. In this case, it is difficult to dissipate heat inside the housing 104, and since the effect of heat becomes more remarkable as the housing 104 is made smaller, it is more difficult to reduce the size while maintaining waterproofness. There was a problem.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and has as its object to reduce the influence of heat from a discharge lamp to a lighting device and to reduce the effects of heat generated by the lighting device itself on electronic components. An object of the present invention is to provide a discharge lamp lighting device and a lighting device which have low thermal stress and can be easily miniaturized.

[0011]

In order to achieve the above-mentioned object, a discharge lamp lighting device according to the present invention comprises a discharge lamp serving as a light source, and a light-distribution control that surrounds the discharge lamp. A discharge lamp comprising: a reflector having an opening at a front end; a lighting device electrically connected to a socket for mounting a light source to control lighting of the discharge lamp; and a housing having a front opening supporting the reflector. In the lighting device, the lighting device is disposed such that a component that generates a large amount of self-heating of a mounted component on the circuit board is located on an upper side of the housing, and a component that is easily deteriorated by heating is located on a lower side of the housing. And projecting from the rear side along the rear plate of the housing.

With this configuration, the lighting device electrically connected to the discharge lamp mounting socket serving as the light source and controlling the lighting of the discharge lamp is provided on the circuit board in the cover member by the self-heating of the mounted component. A large component is formed on the upper side of the housing, and a component that is easily degraded by heating is arranged on the lower side of the housing, and has an opening on one surface that performs light distribution control around the periphery of the discharge lamp. It is provided on the rear side along the rear plate of the housing with the front opening that supports the reflector.

It is preferable to provide a small opening in the rear panel and a heat-insulating lid member for separating the lighting device side and the reflector side. In this case, the mounting component in the cover member of the lighting device and the reflector side are thermally separated by a lid member having thermal insulation across a small opening provided in the rear plate.

It is preferable that the circuit board is provided with a heat shielding member which is divided into an upper side and a lower side of the housing. In this case, the components that are arranged along the rear plate of the housing so as to protrude to the rear of the housing and have large self-heating on the upper side of the housing, and components that are easily deteriorated by heating on the lower side of the housing, It is thermally separated by the heat shielding member. Therefore, it is possible to further reduce the thermal stress on components that are easily deteriorated by heating, from the heat generated by the electronic components that generate large self-heating of the lighting device itself.

It is preferable that the heat shielding member is a separate circuit board on which components are mounted, which is provided on the circuit board. In this case, a component that generates a large amount of self-heating on the upper side of the housing,
Components that are easily deteriorated by heating on the lower side of the housing are thermally separated by another circuit board on which components are mounted, which is provided on a circuit board that also serves as a heat shield.

It is preferable that a supporting piece made of a sheet metal material having high heat conductivity is joined to the rear surface of the socket, and the supporting piece is held by the rear plate. In this case, the heat generated from the discharge lamp is radiated from the rear surface of the discharge lamp mounting socket provided on one surface side of the reflecting mirror to the housing via the support plate made of a sheet metal material having high heat conductivity and the rear plate.

Further, it is preferable to provide a radiation fin above the cover member. In this case, the heat of the mounting component that generates a large amount of self-heating of the lighting device itself is released outside the cover member via the heat radiation fins above the cover member.

Further, it is preferable that the supporting piece is held at a position above the rear plate or the cover member. In this case, the heat generated from the discharge lamp is radiated from the rear surface of the discharge lamp mounting socket provided on one surface side of the reflecting mirror to the upper part of the housing or the cover member through the support piece made of a highly heat conductive sheet metal material. You.

It is preferable that ventilation openings are provided above and below the lid member between the lighting device and the reflector. In this case, the lighting device side and the reflecting mirror side are ventilated through ventilation openings above and below the lid member that separates the reflecting mirror side and the lighting device side.

It is preferable that the cover member has a ventilation hole at least in an upper portion and a lower portion. In this case, the influence of the heat from the discharge lamp to the lighting device is reduced, and the heat of the mounted component that generates a large amount of self-heating of the lighting device itself is radiated to the upper and lower portions of the cover member through the ventilation holes.

It is preferable that the cover member is filled with a resin material having high heat conductivity. In this case, the heat of the mounting component that generates a large amount of self-heating of the lighting device itself is released to the outside of the cover member via the resin material having high heat conductivity filled in the cover member.

It is preferable that the socket is provided with a pulse generator for starting the discharge lamp. In this case, heat from the pulse generator for starting the discharge lamp is radiated to the outside without passing through the lighting device.

Further, in the lighting device of the present invention, the above-described discharge lamp lighting device is a headlight for an automobile.

[0024]

1 and 2 show a first embodiment of the present invention corresponding to all of the first to fourth and twelfth aspects, and FIG. 3 shows a first embodiment of the present invention. FIG. 4 shows a third embodiment corresponding to claim 8, FIG. 5 shows a fourth embodiment corresponding to claim 9, and FIG. FIG. 6 shows a fifth embodiment according to the tenth aspect.

[First Embodiment] FIG. 1 shows a schematic configuration of a discharge lamp lighting device according to a first embodiment of the present invention.
(A) is a side sectional view, and (b) is a plan view of a lighting device. FIG. 2 is an explanatory diagram of another embodiment of the discharge lamp lighting device.

The discharge lamp lighting device according to this embodiment includes a discharge lamp 2 serving as a light source, a reflecting mirror 3 surrounding the discharge lamp 2 and having an opening 3a on one surface for performing light distribution control, and a light source. In the discharge lamp lighting device 1 including a lighting device 6 electrically connected to the mounting socket 4 to perform lighting control of the discharge lamp 2 and a housing 5 having a front opening supporting the reflecting mirror 3, The lighting device 6 is arranged such that the component that generates a large amount of self-heating of the mounted components on the circuit board 61 is located on the upper side of the housing 5 and the component that is easily degraded by heating is located on the lower side of the housing 5. And project from the rear side along the rear plate 51 of the housing 5.

In the discharge lamp lighting device 1 of this embodiment, a small opening 52 is provided in the rear plate 51, and a heat insulating lid member 8 for separating the lighting device 6 side and the reflecting mirror 3 side is provided. I have. Further, in the discharge lamp lighting device 1 of the present embodiment, the circuit board 61 is provided with a heat shield member 62 that is divided into an upper side and a lower side of the housing 5. The discharge lamp lighting device 1 of the embodiment is a lighting device used as a headlight for an automobile.

More specifically, the discharge lamp lighting device 1 serves as a main body of an automotive headlamp, and has a substantially circular opening 3a.
A reflector having a substantially spindle-shaped cross section in which the discharge lamp 2 is mounted on the inside thereof, and an outer case for protecting the reflector 3, the cylinder having an open end on one end face on the front side. And a discharge lamp 2 mounted on a rear plate 51 of the housing 5.
And a lighting device 6 for turning on. The fixed portion of the reflecting mirror 3 is fixed to a fixing portion provided inside the housing 5 via a fixing tool such as a screw (details are not shown). The socket 4 is provided substantially integrally on the back surface. The socket 4 is provided with an internal electric wire 41 connected to a lighting device 6 to be described later, and the periphery thereof is mechanically connected to be able to be separated via a connecting mechanism provided on the reflecting mirror 3. ing.

The housing 5 is formed into a cylindrical shape by, for example, drawing a steel plate, and has a mounting portion for an automobile on an outer surface and the fixing portion on an inner surface. A front cover 11 made of a transparent resin material is fitted and fixed to an opening serving as one end surface of the cylinder via a fitting structure (not shown). The rear plate 51 of the housing 5 is provided with a small opening 52 having a substantially square shape, and a lighting device 6 described later is screw-fixed through a fixing hole provided around the lighting device 6.

The lighting device 6 is electrically connected to the socket 4 to control the lighting of the discharge lamp 2. In this case, a lighting circuit is formed inside a cover member 7 described later. Each electronic component of the circuit block described in the section is disposed on a mounting circuit board 61 such as a glass epoxy board and protruded rearward along the rear face plate 51 of the housing 5. . The circuit board 61
Is connected to a power supply line 63 for supplying DC power to the circuit block.

In the lighting device 6, components (FETs, transformers, etc.) that generate large self-heating of the mounted components in the cover member 7 are on the upper side of the housing 5 and are easily deteriorated by heating (electrolytic capacitors, films, etc.). A capacitor or the like is arranged on the circuit board 61 so as to be on the lower side of the housing 5. By adopting such an arrangement, it is possible to make it difficult to apply the influence of heat generated from the components that generate much self-heating to the components that are easily deteriorated by heating, and to effectively use the heat generated from the components that generate much self-heating. The lighting device 6 can radiate heat upward, compared to the case where the mounted components are randomly arranged.
Thermal stress on electronic components due to heat generated by itself can be reduced.

Further, on this circuit board 61, FIG.
As shown in detail in (b), a plate-like component that divides the mounted components on the circuit board 61 into the above-described components having large self-heating on the upper side of the housing 5 and the components that are easily deteriorated by heating on the lower side. A heat shield member 62 is provided, and these components are thermally separated from each other by the heat shield member 62. Therefore, it is possible to further reduce the thermal stress on components that are easily deteriorated by heating from the heat generated by the electronic components that generate large self-heating of the lighting device 6 itself.

The cover member 7 is a single-sided rectangular box made of synthetic resin or aluminum die-cast, and is a mounting piece 71 for mounting to the rear plate 51 of the housing 5 (see FIG. 1A).
Is protruded sideways around the periphery. The cover member 7 is a substantially square having an outer shape slightly larger than the small opening 52 provided in the rear plate 51 of the housing 5, and is screwed to the rear plate 51 via a mounting piece 71.

The lid member 8 is for thermally separating the lighting device 6 side and the reflecting mirror 3 side, and is formed of a synthetic resin plate such as an epoxy resin having heat insulation and heat resistance. I have. The lid member 8 has a through-hole penetrating the internal electric wire 41 led out from the socket 4, and is fitted and fixed inside the cover member 7.

In the discharge lamp lighting device 1 described above, first, a reflecting mirror 3 having an opening 3a on one surface for controlling light distribution surrounding the periphery of the discharge lamp 2 is provided inside a housing 5 having a front opening. A lighting device 6 that is fixedly supported and then controls the lighting of the discharge lamp 2 is electrically connected to the socket 4 for mounting the discharge lamp, and the cover member 7 is attached to the rear face plate 51 of the housing 5. Done. In this case, on the circuit board 61 in the cover member 7, a component that generates a large amount of self-heating is mounted on the upper side of the housing 5, and a component that is easily deteriorated by heating is mounted on the lower side of the housing 5. It is formed so as to protrude from the rear side of the housing 5 along the rear plate 51. Therefore, the influence of heat from the discharge lamp 2 to the lighting device 6 is most reduced, and the heat generated from the components that generate a lot of self-heating in the lighting device 6 is effectively radiated to the upper side of the lighting device 6, so that the electronic components are not affected. The thermal stress is reduced, and the size and weight are reduced.

At this time, the mounted components in the cover member 7 of the lighting device 6 and the side of the reflecting mirror 3 are heated by the lid member 8 having heat insulation properties through the small opening 52 provided in the rear plate 51. The influence of heat from the discharge lamp 2 to the lighting device 6 is further reduced.

Therefore, according to the discharge lamp lighting device 1 and the lighting device described above, the lighting device 6 that is electrically connected to the discharge lamp mounting socket 4 serving as a light source and controls the lighting of the discharge lamp 2 includes the cover. On the circuit board 61 in the member 7, a component having a large self-heating of the mounted component is disposed on the upper side of the housing 5, and a component which is easily deteriorated by heating is disposed on the lower side of the housing 5. Since the reflector 2 having the opening 3a on one side for surrounding the periphery of the electric light 2 and controlling the light distribution is supported, it is projected rearward along the rear plate 51 of the housing 5 having the front opening. In addition to reducing the influence of heat from the discharge lamp 2 on the lighting device 6, thermal stress on electronic components due to heat generated by the lighting device 6 itself can be reduced, and thus the discharge lamp lighting device can be easily reduced in size.

Then, the mounted components in the cover member 7 of the lighting device 6 and the side of the reflecting mirror 3 are thermally separated by the lid member 8 having heat insulating properties with the small opening 52 provided in the rear plate 51 interposed therebetween. Therefore, the influence of heat from the discharge lamp 2 to the lighting device 6 can be further reduced. Further, in this case, a component that generates a large amount of self-heating on the upper side of the housing 5 and is disposed along the rear plate 51 of the housing 5 so as to protrude to the back of the housing 5, and is used for heating the lower side of the housing 5. Since the components which are easily deteriorated are thermally separated by the heat shielding member 62, the thermal stress on the components which are easily deteriorated by heating is reduced from the heat generated by the electronic components having large self-heating of the lighting device 6 itself. Further reduction can be achieved, and the size can be further reduced.

In the present invention, in addition to the above-described ones, for example, as shown in FIG.
It is also preferable that 2 is another circuit board 64 mounted on the circuit board 61 and mounted with components. On this separate circuit board 64, as shown in the same figure, a case where an electrolytic capacitor having a high mounting height is mounted is shown. Thereby, the lighting device 6 can be efficiently mounted and the lighting device 6 can be made thinner, and the size of the entire lighting fixture can be more easily reduced. Further, according to the present invention, as shown in FIG. 2B, the circuit board 61 is formed so as to have an outer shape substantially matching the small opening 52 provided in the rear plate 51 of the housing 5 so that the mounting component side is formed. Various implementations, such as one in which the circuit board 61 is arranged on the side of the small opening 52 so as to protrude from the back of the housing 5 or one in which the above-mentioned lid member 8 is not provided as shown in FIG. It is needless to say that a form is included.

[Second Embodiment] FIG. 3 is a side view showing a schematic configuration of a discharge lamp lighting device according to a second embodiment.

The discharge lamp lighting device of this embodiment differs from the first embodiment only in the configuration of the socket and a part of the cover member, and the other components are the same as those of the first embodiment. In the discharge lamp lighting device 1 of this embodiment, a support piece 9 made of a sheet metal material having high heat conductivity is joined to the rear surface of the socket 4, and the support piece 9 is held by the rear face plate 51. Further, the discharge lamp lighting device 1 of the present embodiment also includes a radiation fin 72 provided above the cover member 7. In addition, the discharge lamp lighting device 1 according to the embodiment includes the support piece 9.
Is held at a position above the rear plate 51 or the cover member 7. Further, the discharge lamp lighting device 1 of the present embodiment also has the socket 4 provided with a pulse generator for starting the discharge lamp.

The supporting piece 9 supports the socket 4 together with the reflecting mirror 3 and is formed in a substantially step-like shape by a highly heat conductive sheet metal material such as aluminum or copper as shown in FIG. The housing 5 is joined to the rear surface of the socket 4 by screw fixing, and the upper portion is held by screw fixing at a position above the rear plate 51 of the housing 5. In this case, between the support piece 9 and the lighting device 6, in this case, the support piece 9 is heated by the heat generated by the discharge lamp 2, and the heating when radiating the heat toward the lighting device 6 side is reduced. Heat shield plate 1 for
0 is provided.

The socket 4 is provided with a pulse generator for starting the discharge lamp called an igniter, which is described in the section of the prior art. This igniter has several kV to several tens of kV to light the discharge lamp 2.
, And includes a pulse transformer, a switching element, a capacitor, and the like. Therefore, when the igniter and the discharge lamp 2 are connected by, for example, an internal electric wire, it is necessary to give a high level of electrical safety to the internal electric wire. It is possible to use a withstand voltage type. The influence of the heat generated by the discharge lamp 2 on the igniter is determined by the support piece 9 from the rear surface of the discharge lamp mounting socket 4 provided on one side of the reflecting mirror 3 to the rear plate 51.
The heat is dissipated to the housing 5 through the interface and is reduced.

Further, the cover member 7 is made of aluminum die-cast, and the heat radiation fin 72 is integrally formed at a position on the upper side of the housing 5. Therefore, the heat of the mounted component that generates a large amount of self-heating of the lighting device itself inside the cover member 7 is effectively released to the outside of the cover member 7 through the heat radiation fins 72.

Therefore, according to the discharge lamp lighting device 1 and the illuminating device described above, the heat generated from the discharge lamp 2 causes high heat transfer from the rear surface of the discharge lamp mounting socket 4 provided on one side of the reflecting mirror 3. Since the heat is radiated to the housing 5 via the supporting piece 9 made of a sheet metal material and the rear plate 51, the influence of heat from the discharge lamp 2 to the lighting device 6 can be further reduced. Since the heat is radiated to the upper part of the housing 5 or the cover member 7 via the piece 9, the influence of heat from the discharge lamp 2 to the lighting device 6 can be further reduced.

In addition, since the heat of the mounted components of the lighting device 6 which generate a large amount of self-heat is released outside the cover member 7 through the heat radiation fins 72 above the cover member 7, the electronic components are easily deteriorated by heating. Thermal stress can be reduced, and the discharge lamp lighting device 1 can be further miniaturized. Further, since the heat from the pulse generator for starting the discharge lamp is radiated to the outside without passing through the lighting device 6, the influence of the heat from the discharge lamp 2 to the lighting device can be further reduced.

[Third Embodiment] FIG. 4 is a side sectional view showing a schematic configuration of a discharge lamp lighting device according to a third embodiment.

The discharge lamp lighting device of this embodiment is different from the first embodiment only in the structure of the lid member, and the other components are the same as those of the first embodiment. In the discharge lamp lighting device 1 of the embodiment, ventilation openings 81, 81 between the lighting device 6 side and the reflecting mirror 3 side are provided above and below the lid member 8.

The cover member 8 is made of a synthetic resin such as epoxy resin and has heat insulation and heat resistance. In addition to the above-mentioned through holes, ventilation openings having rectifying pieces at the upper and lower ends, respectively, are provided. 81, 81 are provided above and below, and are fitted and fixed inside the cover member 7. Then, the lighting device 6 side and the reflecting mirror 3 side are separated by direct radiant heat, and the temperature difference between the upper and lower portions inside the lighting device 6 is used along the ventilation path indicated by the arrow A in FIG. Lighting device 6 via the internal space of the housing 5 on the side of the reflecting mirror 3
The air inside can be convected.

Therefore, according to the discharge lamp lighting device 1 and the lighting device described above, the lighting device 6 and the lighting device 6 are reflected through the ventilation openings 81 above and below the lid member 8 that divides the reflecting mirror 3 and the lighting device 6. Since the mirror 3 side is ventilated, the discharge lamp lighting device 1 can be more easily miniaturized.

[Fourth Embodiment] FIG. 5 is a side sectional view showing a schematic configuration of a discharge lamp lighting device according to a fourth embodiment.

The discharge lamp lighting device of this embodiment differs from the first embodiment only in the structure of the cover member.
The other components are the same as those of the first embodiment, and the discharge lamp lighting device 1 of the embodiment includes the cover member 7,
At least the upper and lower portions have ventilation holes 73, 73.

The cover member 7 is a rectangular box made of synthetic resin or aluminum die-cast and has a single-sided opening.
Above and below, substantially rectangular ventilation holes 73, 73 are provided, respectively, for ventilating the air inside the lighting device 6 along ventilation paths indicated by arrows B in FIG. Attached to. In this case, the upper vent 7
In order to prevent dust, rainwater, etc. from entering the inside of the lighting device 6, a breathable waterproof cloth called, for example, Gore-Tex is provided on the lighting device 3, and the lower ventilation hole 73 is opened. In order to prevent water from accumulating inside the lighting device 6 even when dew condensation occurs inside. The cover member 7 may be, in addition to the above-described configuration, a single-sided square box made of punched metal having a large number of minute openings on the entire surface.

Therefore, according to the discharge lamp lighting device 1 and the lighting device described above, the influence of the heat from the discharge lamp 2 to the lighting device 6 is reduced, and the heat of the mounted parts of the lighting device 6 that generate large self-heating is reduced. Since heat is radiated to the upper and lower portions of the cover member 7 through the vent holes 73, 73, thermal stress on the electronic component can be further reduced.

[Fifth Embodiment] FIG. 6 is a side sectional view showing a schematic configuration of a discharge lamp lighting device according to a fifth embodiment.

The discharge lamp lighting device of this embodiment is different from the first embodiment only in the configuration for filling with a resin material, and the other components are the same as those of the first embodiment. The discharge lamp lighting device 1 according to the embodiment includes a cover member 7.
The inside is filled with a resin material 65 having high heat conductivity.

More specifically, the lighting device 6 of this embodiment is similar to that of FIG.
As shown in FIG. 7, a resin material having high heat conductivity such as a silicon resin is provided inside the aluminum die-cast cover member 7 so that heat is easily transferred directly from the electronic components mounted on the circuit board 61 to the cover member 7. 65 are filled.

Therefore, according to the discharge lamp lighting device 1 and the lighting device described above, the heat of the mounting component that generates a large amount of self-heating of the lighting device 6 itself causes the resin material 65 filled in the cover member 7 to have high heat conductivity. Since the heat is released to the outside of the cover member 7 through the cover member 7, thermal stress on the electronic components that are easily deteriorated by heating can be reduced, and the discharge lamp lighting device 1 can be further reduced in size.

[0059]

The present invention is embodied as in the above-described embodiment, so that the influence of heat on the lighting device from the discharge lamp can be reduced and the thermal stress on the electronic components due to the heat generated by the lighting device itself can be reduced. Thus, the discharge lamp lighting device can be easily reduced in size.

[Brief description of the drawings]

FIG. 1 shows a schematic configuration of a discharge lamp lighting device according to a first embodiment of the present invention, where (a) is a side sectional view and (b) is a plan view of the lighting device.

FIG. 2 is an explanatory view of another embodiment of the discharge lamp lighting device.

FIG. 3 is a side view illustrating a schematic configuration of a discharge lamp lighting device according to a second embodiment.

FIG. 4 is a side sectional view showing a schematic configuration of a discharge lamp lighting device according to a third embodiment.

FIG. 5 is a side sectional view showing a schematic configuration of a discharge lamp lighting device according to a fourth embodiment.

FIG. 6 is a side sectional view showing a schematic configuration of a discharge lamp lighting device according to a fifth embodiment.

FIG. 7 is a schematic circuit diagram illustrating a circuit example of a discharge lamp lighting device.

FIG. 8 is an explanatory view showing a discharge lamp lighting device as a conventional example of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Discharge lamp lighting device 2 Discharge lamp 3 Reflecting mirror 3a Opening 4 Socket 5 Housing 51 Rear plate 52 Small opening 6 Lighting device 61 Circuit board 62 Heat shielding member 65 Resin material 7 Cover member 72 Radiating fin 73 Vent hole 8 Cover member 81 Ventilation opening 9 Support piece

Claims (12)

[Claims] 1. A discharge lamp serving as a light source, a reflecting mirror surrounding the periphery of the discharge lamp and having an opening on one side for performing light distribution control, and a discharge lamp electrically connected to a socket for mounting the light source. A lighting device for controlling the lighting of the discharge lamp, and a housing having a front opening that supports the reflecting mirror, wherein the lighting device includes a component having a large self-heating of a mounted component on a circuit board. On the upper side of the body, components that are likely to be degraded by heating are arranged at the lower side of the housing, covered with a cover member, and protruded from the back side along the rear plate of the housing. Discharge lamp lighting device. 2. The discharge lamp lighting device according to claim 1, wherein a small opening is provided in the rear plate, and a heat-insulating lid member for separating the lighting device side and the reflector side is provided. 3. The discharge lamp lighting device according to claim 1, wherein the circuit board is provided with a heat shielding member that is divided into an upper side and a lower side of the housing. 4. The discharge lamp lighting device according to claim 3, wherein the heat shielding member is a separate circuit board mounted on the circuit board and having components mounted thereon. 5. The discharge device according to claim 1, wherein a support piece made of a sheet metal material having high heat conductivity is joined to a rear surface of the socket, and the support piece is held by the rear face plate. Lighting device. 6. The discharge lamp lighting device according to claim 1, wherein a radiation fin is provided on an upper portion of the cover member. 7. The discharge lamp lighting device according to claim 5, wherein the support piece is held at a position above the rear plate or the cover member. 8. The discharge lamp lighting device according to claim 2, wherein ventilation openings for the lighting device side and the reflector side are provided above and below the lid member. 9. The discharge lamp lighting device according to claim 1, wherein the cover member has ventilation holes at least in upper and lower portions. 10. The discharge lamp lighting device according to claim 1, wherein the cover member is filled with a resin material having high heat conductivity. 11. The discharge lamp lighting device according to claim 1, wherein the socket is provided with a pulse generator for starting the discharge lamp. 12. An illuminating device using the discharge lamp lighting device according to any one of claims 1 to 11 as an automotive headlamp.