JP3193608B2 - Vehicle lamp having a discharge bulb - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicular lamp suitable for use in a headlight of an automobile, and more particularly to a vehicular lamp in which a discharge lamp is used as a light source to prevent the influence of electromagnetic waves.

[0002]

2. Description of the Related Art In recent years, as a headlight of an automobile, application of a lamp using a discharge bulb as a light source, which has good luminous efficiency and color rendering properties and has a long life, has been studied. However, this type of lamp requires a high voltage to generate a discharge at the discharge bulb, so it is necessary to attach a lighting circuit to the lamp to boost the on-vehicle battery voltage to the required high voltage. There is. In this lighting circuit, since a high voltage is generated on the secondary side, it is required to make the secondary wiring as short as possible for safety measures. Generally, the lighting circuit is integrated with the body of the lamp. Equipment is being done.

On the other hand, in order to downsize the lamp, that is, downsize the lamp body, in a lamp such as a headlight which requires a reflector optical axis adjustment mechanism, the reflector optical axis adjustment movement is performed inside the lamp body. It is necessary to reduce the size of the lamp body while securing an area necessary for the operation. Therefore, in this type of lamp, it is difficult to secure a space for mounting the above-described lighting circuit inside the lamp body, and the lighting circuit must be provided outside the lamp body.

[0004]

However, when the lighting circuit is provided outside the lamp body, an electromagnetic wave generated by the high voltage generated in the lighting circuit is radiated to the outside, and this electromagnetic wave is emitted as noise to various electronic devices of a vehicle. And affect the normal operation of these electronic devices. For example,
This causes noise on the radio or mixes the noise into the signal system of the microcomputer mounted on the car, causing so-called EMI interference. This is because when the lighting circuit is installed inside the lamp body, a film of aluminum or the like formed on the inner surface of the lamp body functions as a shield film, and electromagnetic waves radiated from the lighting circuit are radiated to the outside of the lamp body. However, one of the causes is that the shielding effect cannot be obtained by providing the lighting circuit outside the lamp body.

For this reason, the lighting circuit is housed in a metal case or the like having a shielding effect to prevent the emission of electromagnetic waves, but the cord connecting the lighting circuit and the discharge tube extends outside the lamp body. Therefore, radiation of electromagnetic waves from the cord occurs, and it becomes difficult to prevent the radiation of the electromagnetic waves. In addition, since there is radiation of electromagnetic waves from the connector portion connecting the cord and the discharge bulb and from the discharge bulb itself, it is required to prevent the radiation of these electromagnetic waves.

[0006] An object of the present invention is to provide an EM for a vehicle lamp using such a discharge bulb as a light source due to electromagnetic wave radiation.
It is an object of the present invention to provide a vehicular lamp that can be miniaturized while preventing I failure.

[0007]

SUMMARY OF THE INVENTION A vehicular lamp of the present invention comprises:
Metal on the opening on the back of the reflector inside the lamp body
Socket fixture is attached, and the discharge bulb is
Attached to the reflector via the socket fixture and released
The connector attached to the electrical valve socket has conductive coating
And this conductive coating is applied to the socket fixture.
It is characterized in that it is electrically contacted and shields the discharge bulb. Further, a discharge bulb, a code for electrically connecting the lighting circuit for lighting which was constituted by the shield covered wire, configured to electrically contact the shield covering the conductive coating of the connector. Et al is, are disposed on the front side of the discharge bulb forms a shade for regulating the irradiation range of light conducting material, electrically contacting the shade to the conductive coating. Preferably, the conductive coating is formed of a coating film of a conductive paint or a metal cap formed on the surface of the socket.

[0008]

Next, embodiments of the present invention will be described with reference to the drawings. FIGS. 1 and 2 are a front view and a rear view, respectively, showing a part of an embodiment in which the present invention is applied to a four-light type headlamp of an automobile. FIG. 3 is a sectional view taken along line AA in FIG. 1, and FIGS. 4 and 5 are lines BB and C in FIG.
It is sectional drawing which follows the C line. In these figures, an integrated reflector 2 in which two revolving parabolic reflectors 3 and 4 are continuously provided inside a lamp body 1 and is located outside the vehicle body when mounted on a vehicle A discharge bulb 5 is provided on the reflector 3 on the side of the passing beam lamp LL, and a halogen bulb 6 is provided on the reflector on the side of the traveling beam lamp HL located inside the vehicle body.
Each is detachably attached.

On the back surface of the lamp body 1 facing the bulbs 5 and 6, there are provided opening portions 1 for inserting the bulbs.
a, 1b are provided, and the valves 5, 6 can be attached and detached through the openings 1a, 1b. And
Opening 1 of discharge bulb 5 on low beam lamp LL side
a, a removable back cover 7 is mounted via a seal ring 8, and a rubber cover 9 is mounted on the opening 1b on the side of the traveling beam lamp HL, whereby these openings 1a, 1b are waterproof. It is sealed with. A connector 10 described later in detail is connected to the socket 5a of the discharge bulb 5 of the passing beam lamp LL, and a socket connector 6a of the halogen lamp 6 of the traveling beam lamp HL.
Is projected outside the rubber cover 9, and a connector (not shown) is connected thereto.

A reflective surface is formed by coating or depositing an aluminum film 11 on the inner surfaces of the integrated reflector 2, that is, the reflectors 3 and 4 (see FIG. 7). Further, aluminum films 12 and 13 are applied or deposited on each inner surface of the lamp body 1 and the back cover 7 (FIG. 7).
While this inner surface is used as a part of the reflection surface and a pseudo reflector, it is also configured as a shield film for electromagnetically shielding the inside of the lamp body 1. Further, in order to enhance the shielding effect, a shield plate 14 formed by bending a metal plate is fixedly supported at a position around the discharge bulb on the inner surface of the lamp body 1 by screws or adhesive. A lens 15 is attached to the front opening of the lamp body 1, and the lamps LL and LL are provided in the lamp body 1.
An HL lighthouse is defined. Further, a stud bolt 24 for attaching the lamp to the vehicle body of the automobile is provided upright on the rear surface of the lamp body 1.

On the other hand, FIG. 6 shows a partially exploded perspective view of a main part, and FIG. 7 shows an enlarged sectional view of the assembled state.
In the reflector 3 on which the discharge bulb 5 is mounted, a socket fixture 16 formed by processing a metal plate is fixed to the bulb mounting hole 3a on the back surface, and the discharge bulb 5 is mounted on the socket fixture 16. In the discharge bulb 5, a discharge tube 51 and a conductive support 52 are erected on the front surface of a cylindrical socket 5a, and one end of the discharge tube 51 is connected to a first electrode 53 provided at the center of the rear surface of the socket 5a. , One end of the support is located on a part of the circumference of the peripheral surface of the socket.
Connected to electrode 54. The other end of the discharge tube 51 is electrically connected to the other end of the support 52. Further, a transparent cylindrical shroud 55 is covered on the discharge tube 51, and a conductive light-shielding paint 56 is applied to a part of the shroud 55 to reduce the area of light emitted from the discharge tube 51. Has restricted.

The socket fixture 16 is formed in a substantially annular plate shape, and is screwed and fixed to the valve mounting hole 3a of the reflector 3 at tongue pieces 161 provided at a plurality of locations around the socket fixture. I have. A plurality of hooks 161 for engaging a retainer spring, which will be described later, are formed at a plurality of circumferential positions of the socket fixture 16, and a protruding piece 161 for making electrical contact with the connector 10 is provided. Have been.

Then, the socket 5a of the discharge bulb 5
Of the discharge bulb 5 is brought into contact with the socket fixture 16 and pressed by the elastic force of a retainer spring 17 hooked on a hook 161 of the socket fixture 16 to thereby allow the discharge bulb 5 to be reflected through the socket fixture 16. 3 and fixedly supported. A shade 18 for obtaining required light distribution characteristics is provided at a position on the front side of the discharge bulb 5.
Is arranged. The shade 18 is formed of a metal material capable of blocking light, and a leg 181 extending downward at a lower portion thereof has a screw 182 on a front surface of the reflector 3.
It is fixed at. In this case, it may be configured to be fixed to a part of the socket fixture 16 and electrically connected to the socket fixture 16.

Further, the socket 5a of the discharge bulb 5
The connector 10 has a circular recess 101 formed therein for accommodating a rear portion of the socket 5a, and a conductive portion is formed in a central portion and a part of an inner peripheral surface of the circular recess. First and second terminals 102 and 103 formed of a flexible spring material are arranged. Further, a metal cover 104 as a conductive coating formed by processing a metal material is integrally formed on a peripheral surface of the connector 10, and a peripheral portion 105 of a front opening of the metal cover 104 is positioned at a front position of the connector 10. It is projected up to.

Further, the lighting circuit 2 is connected to the connector 10.
The cord 19 drawn from 0 is connected. The cord 19 is configured as a shield wire in which a two-core internal conductive wire is shielded with a shield coating, and the internal conductive wire is connected to the first and second terminals 10 of the connector 10, respectively.
2, 103, and the shield coating is electrically connected to the metal cover 104 by being clamped from the periphery in the insertion hole of the metal cover 104. Then, by pushing the socket 5a of the discharge bulb 5 into the circular concave portion 101 of the socket 10, the socket 5a is fitted to the connector 10, and at the same time, the first and second electrodes 5 of the socket 5a are fitted.
3 and 54 are respectively in contact with the first and second terminals 102 and 103 of the connector 10 and are electrically connected to each other. At this time, the front opening peripheral edge portion 105 of the metal cover 104 is brought into contact with the protruding piece 163 of the socket fixture 16 and is electrically connected thereto.

The lighting circuit 20 for supplying a high voltage to the discharge bulb 5 is provided with a stabilizing circuit for inputting a vehicle-mounted battery voltage, and for lighting the discharge bulb 5 based on an output voltage of the stabilizing circuit. And a starter circuit for generating a high voltage are integrally formed in a metal case 21. The lighting circuit case 21 is fixedly supported by a bracket, a bolt, and the like (not shown) at the lower surface of the lamp body 1, particularly, at a position immediately below the passing beam lamp LL having the discharge bulb 5. A cord 19 connected to the discharge bulb 5 is drawn out of a lighting circuit case 21. Further, the cord 19 is inserted into a cord insertion hole formed in a part of the rear surface of the lamp body 1 through a rubber bushing 22 for waterproofing. , And the connector 10 is connected to a distal end located inside the lamp body 1. The shield coating of the cord 19 is electrically connected to a ground terminal provided in the lighting circuit 20. In addition,
From the lighting circuit case 21, a power cord 23 connected to a vehicle-mounted battery (not shown) is drawn out.

Here, a fulcrum 31 of the optical axis adjusting mechanism is provided substantially at the center of the upper part of the integrated reflector 2, and the vertical and horizontal optical axis adjusting sections 32 are located immediately below the optical axis adjusting mechanism, and the optical axis adjusting section 32 is located at a position further inside. Is provided with a vertical optical axis adjustment unit 33. As shown in FIG. 5, the optical axis adjustment fulcrum 31 has a pivot receiver 34 integrally attached to the back surface of the integrated reflector 2 and a pivot stud 35 on the lamp body 1 opposed thereto.
The pivot 36 at the tip of the pivot stud 35 is fitted to the pivot receiver 34 to constitute a fulcrum when the integrated reflector 2 is tilted up, down, left and right.

The upper, lower, left, and right optical axis adjusters 32 and 33 are respectively adjusted on the back of the integrated reflector 2, as shown by the upper, lower, left, and right optical axis adjusters 32 in FIG. A nut 37 is attached and an adjusting screw 38 is attached to the lamp body 1 facing the nut 37 in the front-rear direction.
Is rotatably supported, and the adjusting screw 38 is screwed into the adjusting nut 37. Thus, when the adjustment screw 38 is rotated, the screwing position of the adjustment nut 37 with respect to the adjustment screw 38 is changed in the front-rear direction, and the integrated reflector 2 is moved up, down, left, right, up, and down with the fulcrum 31 as a fulcrum. It is tilted and its optical axis is adjusted. In this embodiment, the adjusting screw 38 is connected to an optical axis adjusting shaft 40 protruding toward the front of the lamp body 1 by a gear mechanism 39, and the optical axis adjusting shaft 40 is rotated from the front of the lamp. By doing so, the optical axis adjustment can be performed.

According to the configuration of the lamp of this embodiment, since the lighting circuit 20 is shielded by the metal case 21, the electromagnetic wave from the lighting circuit 20 is not radiated to the outside. Further, a cord 19 which is drawn out of the lighting circuit case 21 and extended to the discharge bulb 5
Is constituted by a shielded wire covered with a shield, electromagnetic radiation from the cord 19 is also prevented. Further, in the discharge bulb 5, a metal cover 104 as a conductive coating provided on the connector 10 and a socket fixture 16 that is electrically contacted with the metal cover 104 allow the rear side of the discharge bulb 5 and the socket 5 a or the like. Since the surroundings are shielded, electromagnetic waves from these are prevented from being radiated toward the back of the lamp.

On the other hand, since the shade 18 made of a metal material is disposed on the front side of the discharge bulb 5, the shade 18 is also shielded in this direction, and the radiation of electromagnetic waves is suppressed. In this case, the conductive paint 56 formed on the shroud 55 surrounding the discharge tube 51 of the discharge bulb 5 also suppresses the emission of electromagnetic waves from the discharge tube 51 in this direction. Further, in this embodiment, the electromagnetic wave is radiated to the outside of the lamp body 1 also by the aluminum film 12 formed on the inner surface of the lamp body 1, the metal shield plate 14, and the aluminum film 13 formed on the inner surface of the back cover 7. Can be prevented from being performed.

Therefore, in this lamp, a necessary space is secured in the lamp body 1 to enable the optical axis of the integrated reflector 2 to be adjusted, while the lighting circuit 20 is used to reduce the size of the lamp body. , The electromagnetic waves generated from the lighting circuit 20, the cord 19, the discharge bulb 5 and the vicinity thereof are at least directed toward the rear of the lamp in which various electronic devices mounted on the automobile are present. Radiated toward the vehicle, and it is possible to prevent noise from being mixed into the radio of the automobile and the effect of electromagnetic waves on other electronic devices.

Here, in the above embodiment, the shade 18
Is electrically floating, but FIG.
The shade 18 may be grounded as shown in FIG. FIG. 8A is a partially exploded perspective view of the same, and FIG. 8B is a cross-sectional view of an assembled state, in which parts equivalent to those in the above embodiment are denoted by the same reference numerals. Here, a pair of stems 183 extending straight in the rear direction of the lamp are integrally provided on the metal shade 18, and a notch recess 3 b is provided at a diameter position of the valve mounting hole 3 a of the reflector 3. Are inserted in the valve mounting holes 3a from the front side of the reflector 3 and are respectively disposed in the concave portions 3b. Then, by fixing the socket fixture 16 to the valve mounting hole 3a with the screw 185 from the back side, the distal end portion 184 is sandwiched between the valve mounting hole 3a and the socket fixture 16, and as a result, the stem 183 is inserted through the stem 183. The shade 18 is electrically connected to the socket fixture 16. As a result, the shade 18 can be maintained at the ground potential, and the effect of preventing the emission of electromagnetic waves from the valve 5 can be enhanced. The retainer spring 17 is inserted into a concave groove 3c provided in a portion protruding in the radial direction from the valve mounting hole 3a, and the socket fixture 16 is inserted.
Is pressed.

The projecting piece 163 provided on the socket fixture 16 shown in FIG. 6 is constituted by a pair of tongue pieces 164 as shown in FIG.
The cord 19 connected to 0 may be fixed by winding. As a result, the shield coating of the cord 19 and the socket fixture 16 can be reliably electrically connected, whereby the shield coating is electrically connected at one end to the ground terminal provided in the lighting circuit 20 and at the other end. By being electrically connected to the socket fixture 16, both ends thereof are grounded, so that the shield coverage of the cord 19 is improved, and the radiation of electromagnetic waves from the cord 19 can be more effectively prevented.

Here, in the above-described embodiment, the metal cover is integrally provided on the outer surface of the connector. However, the metal cover may be formed by applying a conductive paint to the outer surface of the connector thicker. Alternatively, it may be formed separately from the connector. For example, as shown in FIG.
The connector 10 may be of a general resin-molded construction having no metal cover, and a connector cover 25 made of a metal material formed separately from the connector 10 may be covered on the outside thereof. In this example, connector cover 2
5 is formed in a container shape with one open side, and the protruding edge portions 252 provided on the peripheral portion of the opening are elastically fitted by locking pieces 165 provided at four circumferential positions of the socket fixture 16. , The reflector 3 outside the connector 10
Is supported by the valve mounting hole 3a.

Then, as shown in FIG. 9 (b), the cord 19 is inserted into a notch 251 provided on the lower surface thereof, and an electrical connection is made between the cord 19 and the peripheral edge of the socket fixture 16 at the opening edge. Connected to the cable 1
Nine shield coatings are also electrically connected. For example, this figure shows the case of the socket fixture 16 of FIG. 8, and the lower edge of the connector cover 25 is
Are electrically connected to the shield coating of the socket fixture 16 and the cord 19 by being elastically contacted.
Thus, even if the connector cover 25 formed separately from the connector 10 is used, as long as the connector 10 is surrounded, the same shielding effect as in the above embodiment can be obtained.

In the above-described embodiment, a shielded wire having a two-core structure is used for the cord. However, as shown in FIG. 10A, a shielded wire 19A having a single-core structure is used, and two shielded wires are used in parallel. May be used. Further, as shown in FIGS. 10B and 10C, a resin coating is further provided outside the shield coating.
A cord composed of shield wires 19B and 19C having a core structure or a two-core structure may be used. Here, an example is shown in which the shield coating is formed of a metal net formed by forming conductive wires in a mesh shape, but it is needless to say that the shield coating may be formed of metal foil.

In the case of a two-core structure, FIG.
After covering each shield core wire 191 with the inner layer water-resistant soft resin 192 and the outer layer heat-resistant soft resin 193, these core wires are placed in a hollow heat-resistant soft resin tube 194 having a sufficiently large inner diameter. A cord 1 in which a metal mesh 195 is disposed inside the tube 194 and inserted outside the tube.
9D may be used. In this cord 19D, the heat resistance is extremely high because the tube 194 made of a heat resistant resin and the coating 193 have a double structure, and the water resistance is also enhanced by the water resistant resin 192. Further, since a gap 196 is provided between the tube 194 and each core wire,
The dielectric strength of air also increases the withstand voltage. Of course, it is needless to say that the electromagnetic shield is secured by the metal mesh 195.

Further, in the lighting circuit 20 of the above embodiment, an example is shown in which the stabilizing circuit section and the starter circuit section constituting the lighting circuit are integrally provided in one lighting circuit case 21. As shown in (a) to (c), a configuration may be adopted in which the stabilizing circuit unit 201 and the starter circuit unit 202 are housed in separate circuit cases.
In FIG. 11A, the stabilizing circuit unit 201 configured separately is shown.
An example is shown in which both the starter circuit unit 202 and the starter circuit unit 202 are fixedly supported side by side on the bottom surface of the lamp body 1. FIG.
FIG. 3B shows an example in which the stabilizing circuit unit 201 is fixedly supported on the bottom surface of the lamp body 1 and the starter circuit unit 202 is fixedly supported on the back surface of the lamp body 1. Further, FIG.
3C shows an example in which the starter circuit unit 202 is fixedly supported on the back surface of the lamp body 1, and the stabilizing circuit unit 201 is fixedly supported on a part of the vehicle body or the like different from the lamp body 1.

In particular, in the example of FIG. 11B, the connection cord 26 for connecting the stabilizing circuit section 201 and the starter circuit section 202 is extended inside the lamp body 1 so that the connection cord 26 This prevents electromagnetic waves from being radiated to the outside of the lamp body 1 to enhance the shielding effect. On the other hand, in the example of FIG.
1 and starter circuit section 202 connecting cord 26
Is extended outside the lamp body 1. By using a shielded wire as shown in FIG. 9 as the connection cord 26, the radiation of electromagnetic waves from the connection cord 26 is suppressed and the shielding effect is obtained. Have gained.

Here, in the above-described embodiment, an example in which the present invention is applied to a four-lamp type headlamp is shown, but a two-lamp type headlamp or another lamp such as a fog lamp or a clearance lamp is integrated. It is also possible to apply to a combination type headlight.

[0031]

As described above, according to the present invention , the metal opening is formed in the opening on the back of the reflector provided inside the lamp body.
The socket fixture is attached and the discharge bulb is
Attached to the reflector via the
The connector attached to the lube socket is covered with conductive coating.
And this conductive coating is electrically connected to the socket fixture.
It is configured to shield the discharge bulb by contacting it in particular, so the discharge bulb, socket,
To effectively prevent the emission of electromagnetic waves from
EMI can be effectively prevented from affecting the radio and other electronic devices of the automobile. Therefore, even if the lighting circuit is arranged outside the lamp body to secure the necessary space for adjusting the optical axis of the reflector built in the lamp body, electromagnetic radiation from the lighting circuit is reliably prevented. This is advantageous in reducing the size of the lamp.

[Brief description of the drawings]

FIG. 1 is a partially cutaway front view of an embodiment of a headlight according to the present invention.

FIG. 2 is a rear view of FIG.

FIG. 3 is a sectional view taken along line AA in FIG.

FIG. 4 is a sectional view taken along line BB of FIG. 1;

FIG. 5 is a sectional view taken along line CC in FIG. 1;

FIG. 6 is a partially exploded perspective view of a main part.

FIG. 7 is a sectional view of the assembled state of FIG. 6;

FIG. 8 is a partially exploded perspective view of a main part showing another embodiment of the present invention and a sectional view of an assembled state thereof.

FIG. 9 is a sectional view of another embodiment of the connector cover and an assembled state thereof.

FIG. 10 is a perspective view and a sectional view showing a modified example of the cord.

FIG. 11 is a schematic configuration diagram showing a different modification of the lighting circuit.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Lamp body 2 Integrated reflector 5 Discharge bulb 6 Halogen bulb 7 Back cover 10 Connector 11, 12, 13 Aluminum film 14 Shield plate 15 Lens 16 Fixture 18 Shade 19 Cord (shield wire) 104 Metal cover LL Passing beam lamp HL Traveling beam lamp

──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Masahiro Kusaya 500 Kitawaki, Shimizu City, Shizuoka Prefecture Inside Koito Manufacturing Shizuoka Plant (72) Inventor Masatoshi Yoneyama 500 Kitawaki Shimizu City, Shizuoka Prefecture Koito Manufacturing Shizuoka Plant (56) References JP-A-5-89702 (JP, A) JP-A-5-211002 (JP, A) JP-A-6-86203 (JP, U) (58) Fields investigated (Int. ⁷ , DB name) F21S 8/10

Claims (8)

(57) [Claims] 1. A reflector is provided inside a lamp body ,
In a vehicle lighting device having a discharge bulb attached to the reflector, a metal source is provided in an opening on the back surface of the reflector.
A socket fixture is attached and the discharge bulb is
Attached to the reflector via a ket fixture,
The connector attached to the discharge bulb socket is conductive
And the conductive coating is covered with a conductive coating.
A vehicular lamp having a discharge bulb, wherein the discharge bulb is shielded by being electrically contacted with the light source. 2. A method according to claim wherein the discharge valve and the code for electrically connecting the lighting circuit for lighting which was constituted by the shield covered wire, electrically contacting the shield covering the conductive coating of the connector vehicle lamp having a discharge bulb as claimed in 1. Wherein the discharge valve is disposed on the front side of the form with the shade a conductive material for restricting the irradiation range of light, according to claim 1 or 2 comprising electrical contact causes the shade to the conductive coating vehicle lamp having a discharge valve according to. Wherein said conductive coating is a vehicle lamp having a discharge bulb as claimed in any one of constituted claims 1 to 3 in coating film or the metal cap formed on the surface of the socket conductive coating . 5. The method according to claim 2 , wherein the shield coating of the cord is formed of a wire mesh or a metal foil.
A vehicular lamp having the discharge bulb as described in the above . Wherein said lighting circuit vehicular lamp having a discharge bulb as claimed in any one of claims 2 to 5 is disposed outside of the lamp body. Wherein said lighting circuit is composed of a stabilizing circuit and a starter circuit, connecting cord that connects the stabilizing circuit and the starter circuit according to claim 6, which is housed in the lamp body A vehicle lamp having a discharge bulb. Wherein said lighting circuit is composed of a stabilizing circuit and a starter circuit, connecting cord for connecting the stabilizing circuit and the starter circuit according to claim 6 which is extended to the outside of the lamp body A vehicle lamp having a discharge bulb.