JPH09293403A - Lighting fixture for vehicle having discharge bulb - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lighting fixture for a vehicle suppressing increased total height dimensions and depth dimensions to eliminate a problem of heat in the lighting fixture having a lighting circuit of a discharge bulb. SOLUTION: In a headlamp integrally constituting a high beam lamp HHL for running and a low beam lamp LHL in a single lighting fixture body 1, providing a discharge bulb 16 as a light source of the low beam lamp and forming its depth dimension larger than that of the high beam lamp, behind the high beam lamp in a short side of the depth dimension, cases 30, 40 of a lighting circuit for lighting the discharge bulb 16 are arranged. The increased total depth dimension of a lighting fixture is suppressed, and weight balance of the lighting fixture itself is improved. The lighting circuit cases 30, 40 are formed to be divided into a primary/secondary side, so as to enhance respective heat radiation, a bad influence due to mutual interference of the heat between the lighting fixture and the lighting circuit is relaxed.

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 as an automobile headlight, and more particularly, to prevent the influence of electromagnetic waves in a lamp using a discharge bulb as a light source, while reducing the thickness of the lamp and heat dissipation. TECHNICAL FIELD The present invention relates to a vehicular lamp having improved property.

[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, since this type of lamp requires a high voltage to generate discharge at the discharge bulb, it is necessary to attach a lighting circuit to the vehicle to boost the on-vehicle battery voltage to the required high voltage. There is. In this case, if the lighting circuit and the lighting device are arranged at positions separated from each other, electromagnetic waves are generated by the high voltage generated on the secondary side of the lighting circuit, which is radiated to the outside and becomes noise to the radio of the car, or mounted on the car. Noise is mixed in the signal system of the microcomputer, causing so-called EMI failure.

Therefore, there has been considered a lamp in which the lighting circuit is integrally formed with the lamp to shorten the wiring length on the secondary side of the lighting circuit and suppress the emission of electromagnetic waves. For example, a configuration is conceivable in which the lighting circuit is integrally incorporated in the lighting circuit case, and the lighting circuit case is integrally attached to the lower surface of the lamp body. However, this type of lighting circuit usually requires a step-up transformer and a large-capacity capacitor, and thus tends to be heavy. Therefore, when considering the weight balance of the entire lighting fixture, attach it to the bottom of the lighting fixture body. Is preferred.

[0004]

However, in this case, when viewed from the front of the lamp, the lighting circuit case is projected below the lamp body, and the overall height of the lamp is large. . For this reason, when mounting this lamp on a vehicle, it is necessary to perform processing on the vehicle body side of the vehicle so that this portion is not exposed to the outside, but this processing requires a design change of the vehicle body of the vehicle. In addition, the design of the vehicle body is restricted, which is not preferable in terms of the degree of freedom in designing the vehicle. Also,
When the lighting circuit case is attached to the back side of the lamp body, the depth dimension of the lamp becomes large, and it cannot be applied to a lamp in which the increase in the depth dimension of the lamp reaches a limit.

Further, when attached to the lower surface of the lamp body, the heat generated in the lighting circuit is convected upward and transferred to the lamp, so that the lamp may be overheated and adversely affected. Regarding this heat problem, when the lighting circuit is arranged above the lamp, the heat generated in the lamp is transferred to the lighting circuit and the lighting circuit is overheated, and the electronic components that make up the lighting circuit are damaged by the heat. , Or life is shortened.

An object of the present invention is to provide a vehicular lamp that suppresses an increase in the total height dimension and an increase in the depth dimension of a lamp having such a lighting circuit of a discharge bulb and solves the problem of heat. is there.

[0007]

According to the present invention, a plurality of lamps are integrally formed in one lamp body, and at least one lamp is provided.
A discharge bulb is provided as the light source for the two lamps, and 1
In a vehicular lamp in which the depth dimension of one lamp is made larger than the depth dimension of another lamp, a lighting circuit for lighting a discharge bulb is arranged behind the lamp having a short depth dimension. The lighting circuit is separately formed by a primary side circuit section and a secondary side circuit section as a starter circuit section, and each circuit section is housed in an independent circuit case, and these circuit cases are arranged in the vertical direction of the lamp body. Is arranged opposite to. Further, it is preferable that each of the circuit cases of the primary side circuit section and the starter circuit section is arranged in an area excluding the position behind the bulb attachment / detachment port of a lamp having a short depth dimension. For example, as a preferred embodiment of the present invention, the lamp provided with the discharge bulb is formed of a projection lamp, and the depth dimension thereof is made larger than that of the adjacent lamp to form the lamp.

[0008]

Next, the present invention will be described with reference to the drawings. 1 (a) and 1 (b) are a front view and a rear view of an assembled state of an embodiment in which the lamp of the present invention is applied to a vehicle headlight, FIG. 2 is a horizontal sectional view taken along line AA, and FIG. 3 (a). ，
(B) is each vertical sectional view of a BB line and a CC line. Further, FIG. 4 is a perspective view from the back side, and FIG. 5 is a partially exploded perspective view. In these figures, headlights are a traveling beam lamp HHL and a passing beam lamp LHL.
It is configured as a left-side lamp of a so-called four-lamp type headlight in which the above are integrally configured. The lamp body 1 is formed by resin molding, and the rear surface thereof is the traveling beam lamp HH.
The depth dimension on the side of the passing beam lamp LHL is larger than that of L, and this portion is projected rearward to have an L-shaped planar shape. A lens 2 is attached to the front opening of the lamp body 1 to define a lamp chamber. This lamp body 1 has a stud bolt 8 provided on the back side.
Is attached to the car body (not shown).

A reflector 3A is provided in a region of the lamp chamber.
And the reflector 3A is configured as a reflector of the traveling beam lamp HHL. Further, the pseudo reflector 3B of the passing beam lamp LHL is arranged in the adjacent lamp chamber. The pseudo reflector 3B has a structure in which a conductive film is formed on the surface of a metal material or a resin molded product, and an opening 3a is provided in the pseudo reflector 3B. The passing beam unit 10 is installed inside the passing beam unit 10 and the lamp body. It is arranged to close the gap between them. Further, in the traveling beam lamp HHL, a bulb insertion hole 3b is formed on the back surface of the reflector 3A, and the bulb 5 is supported by the socket connector 4 attached thereto. A bulb insertion hole 1b is formed in the rear surface of the lamp body 1 at a position behind the socket connector 4 and is sealed by a back cover 6.

The passing beam unit 10 is configured as a projector lamp, and has a spheroidal reflector (condensing mirror) 11 formed of a metal material such as aluminum and a front opening flange of the reflector 11. A cylindrical lens holder 12 that is attached by a screw and is also formed of a metal material such as aluminum, and a lens 13 that is attached to the front end portion of the lens holder 12 constitute a housing, and the optical axis adjustment described later is performed. It is supported by the mechanism so that the optical axis can be adjusted in the up, down, left and right directions with respect to the lamp body 1. As the optical axis adjusting mechanism, for example, as shown in FIG. 1 (a), a fulcrum portion 21 of the optical axis adjusting mechanism is provided substantially in the center of the lower part of the lamp body 1, and the fulcrum portion 21 is sandwiched between the left and right upper parts. Up, down, left and right optical axis adjustment unit 22
A and 22B are provided.

The optical axis adjusting fulcrum portion 21 has a pivot receiver 24 integrally attached to an adjusting plate 23 fixed integrally with the reflector 11 as shown in FIG. 1, a pivot stud 25 is provided upright, and a pivot provided at the tip of the pivot stud 25 is fitted into the pivot receiver 24 to move the reflector 12, that is, the low beam unit 10 up and down.
It constitutes a fulcrum when tilting left and right. Further, in the vertical and horizontal optical axis adjusting parts 22A and 22B, as shown by the vertical and horizontal optical axis adjusting part 22A in the same figure (b), a ball receiver 26 is attached to the adjusting plate 23, and An optical axis adjusting screw 27 is screwed in the lamp body 1 facing to the front and rear direction, and a ball portion provided at the tip of the optical axis adjusting screw 27 is fitted to the ball receiver 26. As a result, when the optical axis adjusting screw 27 is rotated to change the front-rear position with respect to the lamp body 1, the ball receiver 26 is changed in the front-rear front-rear direction, and the reflector 11, that is, the passing beam unit 10 is moved. The optical axis is adjusted by inclining in different vertical and horizontal directions with the fulcrum portion 21 as a fulcrum.

Further, a socket connector 15 is attached to the valve insertion hole portion 14 formed in the rear surface of the reflector 11, and the discharge bulb 16 is attached by the socket connector 15.
Are supported at the focal position of the reflector 11. In addition,
A shade 17 and a heat shield plate 18 for satisfying a predetermined light distribution characteristic for the discharge bulb 16 are provided in the lens holder 1.
Supported by 2. Further, in the lamp body 1, an opening window 1a is formed on the rear surface of the lamp body 1 in which the passing beam unit 10 is installed, in which the discharge bulb 16 can be attached and detached together with the socket connector 15. Then, a starter circuit case 30 in which a starter circuit portion constituting a lighting circuit 50 for lighting the discharge bulb 16 is mounted is attached to the opening window 1a.

Here, the lighting circuit 50 is, as shown in FIG. 6, a DC-AC conversion circuit section (hereinafter, D / A conversion circuit section) for converting the DC voltage of the vehicle-mounted battery BT into an AC voltage.
51, and a starter circuit unit 52 that boosts the converted AC voltage to a voltage required for the discharge bulb 16 to start discharging. Further, here, each D / A conversion circuit section 51 and the starter circuit section 52 of the lighting circuit 50 are separately housed in separate circuit cases, that is, the D / A conversion circuit case 40 and the starter circuit case 30. .

The starter circuit case 30 accommodating the starter circuit portion 52 is composed of an upper case 31 and a lower case 32 made of a metal material such as aluminum as shown in the sectional structure taken along the line DD in FIG. 1 (b). It has a dividable structure and is attached to the lamp body 1 in the upper case 31. At this time, the lower case 32 is positioned at the rear side of the traveling beam lamp HHL and is located at a position equal to or slightly lower than the height of the back cover 6 with respect to the vertical direction of the lamp body 1. It is mounted in a slightly tilted position. The upper case 31 is formed in the shape of a laterally-oriented short cylindrical container with the cylinder axis shortened as much as possible, and a rectangular flange 33 provided on a part of the peripheral wall of the upper case 31 is opened by a screw 34 in the opening of the lower case 32. Are linked to. Further, an opening 35 is formed in a part of the peripheral wall located on the bottom surface of the upper case 31.
Is provided and communicates with the lower case 32. And
The upper case 31 is configured so as to be integrally fixed to and supported by the lamp body 1 with a bolt 37 via a seal ring 38 by utilizing a tongue-shaped screw insertion portion 36 provided at three peripheral portions thereof. On the other hand, the lower case 32 is formed as a rectangular container.

Most parts of the starter circuit portion 52 are housed in the lower case 32, and other small parts are arranged in a region along the inner peripheral surface of the upper case 31, although not shown. . Further, the cord 53 to which a high voltage is applied in the starter circuit portion 52 installed in the lower case 32 is extended from the lower case 32 to the upper case 31 through the opening 35 provided in the peripheral wall, and the upper case 31 is formed.
A connector 54 is connected to the tip of the connector inside, and the connector 54 is fitted into the socket connector 15. At this time, the cord 54 is connected via the connector 55. Further, the low-voltage primary wiring cord 56 of the starter circuit portion 52 is drawn out through a notch provided in a connecting portion of the upper edge of the lower case 32 with the upper case 31, and is connected to the conversion circuit case. .

On the other hand, the D / A conversion circuit case 40 is formed in the shape of a thin rectangular container having a relatively small height, and is located on the back side of the traveling beam lamp HHL and on the back cover 6. Bracket 41 in the upper position
Is fixed to the lamp body 1 by screws. This D / A
The conversion circuit case 40 is connected with the primary wiring cord 56 from the starter circuit case 30 and also with a power cord 57 for connecting to a vehicle-mounted power source (not shown). As a result, the D / A conversion circuit case 40 is arranged in the recess formed by the rear shape of the lamp body 1 being approximately L-shaped in a top view. Similarly, the lower case 32 of the starter circuit case 30 is also arranged in this recess. And these D / A
The conversion circuit case 40 and the lower case 32 of the starter circuit case 30 are arranged so as to face each other above and below the lamp body 1.

According to the vehicular lamp having this structure, the discharge bulb 16 connected to the starter circuit portion 52 via the cord 53 and the connector 54 is shielded by the metal starter circuit case 30 on the back side of the lamp body 1. Therefore, the electromagnetic waves generated in the discharge bulb 16, the cord 53, and the connector 54 are prevented from being radiated to their peripheral portions. On the other hand, in the starter circuit case 30, most of the components that make up the lighting circuit are housed in the lower case 32, and the upper case 31 is formed as thin as possible. Even when the lamp body 1 is attached to the lamp body 1 at the rear position of the beam lamp LHL, the depth dimension of the lamp body 1 is not so large. Further, in this case, the weight of the lamp having a large depth dimension is usually formed to be higher than that of the lamp side having a short depth dimension, but as described above, the weight of the D / A conversion circuit case 40 is By disposing the relatively large lower case 32 on the side having a shorter depth dimension, it is effective in improving the weight balance of the entire lamp in the left-right direction.

Further, the lower case 32 is L of the lamp body 1.
By being arranged in the concave portion of the character-shaped rear surface, even if the depth dimension of the starter circuit portion 52 is increased to accommodate the required components, the dimension is within the range of the concave portion described above. 1 can be increased in the front direction, the amount of protrusion of the lamp body 1 to the rear is suppressed, and the depth dimension of the lamp body 1 is not increased. Further, since the D / A conversion circuit case 40 is arranged in the concave portion of the L-shaped rear surface on the rear side of the traveling beam lamp HHL, the depth dimension of the entire lamp body 1 hardly increases. Furthermore, this D
Although the A / A conversion circuit case 40 is attached to the upper portion of the lamp body 1, the lower case 32 is located substantially directly below the D / A conversion circuit case 40 and relatively on the lower portion of the lamp body. Since the lamp body 1 is arranged, the upper and lower weights of the lamp body 1 are balanced by these two cases, and the weight is also stable.

Further, the D / A conversion circuit case 40 and the starter circuit case 30 are arranged immediately after the back cover 6 of the traveling beam lamp HHL, that is, immediately after the valve insertion hole 1b for attaching and detaching the valve 5. Since it does not exist, it does not hinder the attachment / detachment operation of the valve 5.
Further, since the circuit cases 30 and 40 are arranged apart from each other, the heat dissipation of the heat generated in the circuit parts 52 and 51 is improved, and the heat does not affect the lamps. Further, since the circuit cases 40 and 30 are vertically opposed to each other, the primary side cord 56 connecting both circuit parts can be shortened, and there is an advantage that it does not interfere with the work when mounting the lamp.

In this embodiment, since the lighting circuit case 30 is divided into the upper case 31 and the lower case 32, if it becomes necessary to inspect the starter circuit section 52 or replace parts, If the lower case 32 is removed from the upper case 31, the lower case 32 is removed from the lamp body 1 with the upper case 31 still attached to the lamp body 1, and the starter circuit portion 52 housed therein is inspected and parts are checked. Exchanges can be made. In this way, lighting circuit case 3
Since it is not necessary to remove the entire 0 from the lamp body 1,
The depth dimension of the lamp body is slightly reduced by mounting the starter circuit case, and the work can be easily performed even when the vehicle space on the rear side is narrowed. In this case, as shown in FIG. 7, since the cord 53 is connected inside the lower case 32 by the connector 55, the cord 53 can be separated at this portion, and the lower case 32 can be attached and detached very easily. As a result, it becomes possible to easily assemble the lighting circuit case 30 and the lamp.

The above embodiment shows an example in which the present invention is applied to a four-lamp type headlight of an automobile in which a traveling beam lamp and a passing beam lamp are integrated. The same can be applied to a lamp in which another auxiliary lamp such as a fog lamp is integrated, as long as it uses the discharge bulb as a light source. Further, in the above-described embodiment, an example in which a projector lamp is used as a passing beam lamp is shown, but the present invention can be similarly applied to a lamp including a general lamp including a reflector and a light source. it can.

[0022]

As described above, according to the present invention, a plurality of lamps are integrally formed in one lamp body, and the depth dimension of one lamp is larger than the depth dimension of another lamp. In the vehicle lamp having, since the lighting circuit for lighting the discharge bulb is arranged behind the lamp having a short depth dimension, the lighting circuit does not increase the height dimension and the depth dimension of the lamp, In addition to being able to favorably attach to the vehicle,
The weight balance of the entire lamp can be stabilized. Further, since the case of the lighting circuit is configured so that the primary side circuit section and the secondary side circuit section are independent of each other, the heat sources are distributed, the heat dissipation in each is improved, and the lighting fixture and the lighting circuit are separated. Thermal interference between the two is prevented.

[Brief description of drawings]

FIG. 1 is a front view and a rear view of an embodiment of a headlamp of the present invention.

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is a cross-sectional view taken along line BB and line CC of FIG.

FIG. 4 is a perspective view of the headlamp as viewed from the rear side.

FIG. 5 is an exploded perspective view of a part of FIG.

FIG. 6 is a circuit configuration diagram of a lighting circuit.

FIG. 7 is an enlarged cross-sectional view taken along line DD of FIG. 1 (b).

[Explanation of symbols]

 1 Lamp Body 2 Lens 3A Reflector 3B Pseudo Reflector 10 Passing Beam Unit 11 Reflector 12 Lens Holder 13 Lens 15 Socket Connector 16 Discharge Valve 30 Starter Circuit Case 31 Upper Case 32 Lower Case 40 D / A Conversion Circuit Case 50 Lighting Circuit 51 D / A conversion circuit section 52 Starter circuit section

Claims (4)

[Claims] 1. A plurality of lamps are integrally formed in one lamp body, a discharge bulb is provided as a light source of at least one lamp, and a depth dimension of one lamp is larger than a depth dimension of another lamp. A vehicle lamp having a discharge bulb, wherein a lighting circuit for lighting the discharge bulb is arranged behind the lamp having a short depth. 2. A lighting circuit is separately formed of a primary side circuit section and a secondary side circuit section as a starter circuit section, and each circuit section is housed in an independent circuit case, and these circuit cases are lit. A vehicular lamp having a discharge bulb according to claim 1, wherein the vehicular lamp is arranged so as to face each other in a vertical direction of a body. 3. A vehicular lamp having a discharge bulb according to claim 2, wherein each of the circuit cases of the primary side circuit section and the starter circuit section is arranged in an area excluding a position behind a bulb attaching / detaching port of a lamp having a short depth dimension. 4. A vehicle lamp having a discharge bulb according to claim 1, wherein the lamp provided with the discharge bulb is a projection lamp, and the depth dimension thereof is larger than that of an adjacent lamp.