JP2004342361A - Four-lamp system headlamp device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a four-lamp system headlamp device composed of discharge bulbs capable of switching between functions at a quick response speed without causing an enlargement of the device. <P>SOLUTION: The headlamp device has a pair of lighting fixtures in which two discharge bulbs 2, 2 are provided with each lighting fixture together with reflectors 4, 40, respectively. One of the two discharge bulbs 2, 2 is composed of at least a discharge bulb 20 having a passing beam function, and the other is composed of a discharge bulb 21 having other functions, and also the both discharge bulbs 20, 21 are supplied with power from one high-voltage generation circuit 11. Since the switching between the functions is performed after the stable light-on of the discharge lamp 20 having the passing beam function used frequently, the switching can be performed under a stable voltage of the generation circuit 11, so that the switching can be performed at the quick response speed. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a headlamp device which is provided with two discharge bulbs in each of a pair of lamps, is configured as a four-lamp type as a whole, and is provided with two different functions to each discharge bulb to provide a multifunctional headlamp apparatus.
[0002]
[Prior art]
FIG. 5 shows a headlamp device 100 provided with a discharge bulb 2 (for example, see Patent Document 1). The discharge bulb 2 is detachably attached to a socket 3, and the socket 3 is detachably attached to a reflector 4.
[0003]
The inner surface of the reflector 4 reflects a light L1 from the discharge bulb 2 to obtain a predetermined low-beam light distribution pattern LP shown in FIG. 6, and light L1 and L2 from the discharge bulb 2 Are reflected together with the first reflection surface 4a to obtain a predetermined high beam light distribution pattern HP shown in FIG.
[0004]
Here, the predetermined low beam light distribution pattern LP and the predetermined high beam light distribution pattern HP are referred to as European light distribution standard ECEReg. Or a light distribution pattern conforming thereto (for example, Japanese domestic type approval standard) or a light distribution standard such as FMVSS of the North American light distribution standard. In the low beam light distribution pattern LP described above, the light distribution is standardized so as to limit the dazzling light. As a result, as shown in FIG. 6, the low beam light distribution pattern LP has a light-dark boundary line LP1 that is considered for oncoming vehicles and pedestrians on the left side of the road.
[0005]
That is, the light-dark boundary line LP1 is located between the right end and substantially the center and is slightly below the horizontal line HL-HR, so as not to dazzle the oncoming vehicle. In order to make the left shoulder pedestrian visually recognizable without giving dazzling light to the pedestrian, it is composed of a gentle slope line part LP3 which is gently inclined from the horizontal line part LP2 substantially at the center, for example, 15 ° to the upper left. On the other hand, in the above-described high beam light distribution pattern HP, the light intensity distribution and the maximum light intensity band are standardized. As a result, as shown in FIG. 7, the above-described high beam light distribution pattern HP has a hot zone HZ (maximum luminous intensity zone including the maximum luminous intensity point) in the central portion.
In FIG. 5, the fixed shade 5 includes a cylindrical cover portion 5a having a closed front portion and an open rear portion, and a fixed leg portion 5b integrally projecting from the lower end of the opening of the cover portion 5a. Have been. The fixed leg 5b is fixed to the reflector 4 by a screw, and as a result, the cover 5a is arranged in front of the discharge bulb 2. The fixed shade 5 directly emits direct light (not shown) other than the reflected light (not shown) reflected by the first reflecting surface 4a and the second reflecting surface 4b of the light from the discharge bulb 2. ) To shield light.
[0006]
In FIG. 5, the movable shade 6 has a rectangular cylindrical shape, and a predetermined low beam light distribution pattern LP is obtained by the driving means 7 outside the discharge bulb 2 and inside the covering portion 5a of the fixed shade 5. 5 between a low beam position (position indicated by a solid line in FIG. 5) and a high beam position (position indicated by a dashed line in FIG. 5) at which a predetermined high beam light distribution pattern HP is obtained. It is arranged to be switchable in the direction of the arrow and the direction of the dashed-dotted arrow. The movable shade 6 switches between a predetermined low beam light distribution pattern LP and a predetermined high beam light distribution pattern HP.
Further, in FIG. 5, the driving means 7 includes a fixed-side base 7a, a solenoid 7b, a fixed guide rail 7c and a movable guide rail 7d, a movable-side bracket (or stay) 7e, and a tension coil as an elastic member. And a spring 7f. The movable shade 6 is always pulled toward the low beam position by the tension coil spring 7f.
[0007]
The headlamp device 100 thus configured is of a two-lamp type. When the discharge bulb 2 is turned on when the movable shade 6 is located at the low beam position, light L1 from the discharge bulb 2 is emitted. The light is reflected by the first reflecting surface 4a, and the reflected light is irradiated forward, so that a predetermined low-beam light distribution pattern LP shown in FIG. 6 is obtained.
[0008]
Next, when the solenoid 7b is energized, the movable shade 6 moves from the low beam position to the high beam position against the tensile force of the tension coil spring 7f, and is fixed and held at the high beam position by the attraction force of the solenoid 7b. . As a result, the light L1, L2 from the discharge bulb 2 is reflected by the first reflection surface 4a and the second reflection surface 4b, and the reflected light is radiated forward, and a predetermined high beam light distribution pattern HP shown in FIG. Is obtained.
[0009]
Then, when the power supply to the solenoid 7b is cut off, the movable shade 6 is pulled from the high beam position to the low beam position by the tensile force of the tension coil spring 7f and is fixed and held.
[0010]
[Patent Document 1]
Japanese Patent Application Laid-Open No. 2000-200509 (specification paragraph numbers [0009] to [0019], FIGS. 1, 7, and 8)
[0011]
[Problems to be solved by the invention]
As described above, the headlamp device 100 is of a two-lamp type. However, if the headlamp device 100 is increased to a four-lamp type by increasing the number of discharge bulbs in order to meet the demand for multifunctionality, the following problem arises.
[0012]
In other words, this type of lamp requires a high voltage to generate discharge at the discharge bulb, so a high voltage generation circuit for boosting the on-board battery voltage to the required high voltage is included with the lamp. Need to be done. For this reason, an increase in the number of discharge bulbs involves an increase in the number of high-voltage generating circuits, which in turn leads to an increase in the size of the headlamp device.
[0013]
Furthermore, the newly added high-voltage generation circuit is formed independently of the existing one. In this case, it takes time to boost the target high-voltage generation circuit when switching between functions. Therefore, there is also a problem that a delay occurs until lighting at a stable voltage and the response speed is reduced.
[0014]
Therefore, the present inventor has made various studies, and as a result, a four-lamp type all light source is constituted by a discharge bulb, and one of two discharge bulbs in each lamp is constituted by a discharge bulb having a passing beam function. At the same time, by controlling the lighting of the two discharge bulbs by one high-voltage generation circuit, it is possible to suppress an increase in the size of the device, and to switch between the functions by using a frequently used passing beam function. The present invention has been found to be performed after stable discharge of the discharge bulb to be performed, so that the discharge can be performed under a stable voltage of the high-voltage generating circuit, thereby achieving a high response speed, and the present invention has been completed.
[0015]
That is, an object of the present invention is to provide a four-lamp type headlamp device in which all light sources are constituted by discharge bulbs, which can switch between functions at a high response speed without increasing the size of the device. I have.
[0016]
[Means for Solving the Problems]
In order to achieve the above object, the invention according to claim 1 is a four-lamp type headlamp device in which two discharge bulbs are provided in each of a pair of lamps together with a reflector.
One of the two discharge bulbs is constituted by a discharge bulb having at least a passing beam function, and the other one is constituted by a discharge bulb having other functions. The discharge bulb is characterized by being fed by one high voltage generation circuit.
[0017]
For this reason, according to the first aspect of the present invention, one of the two discharge bulbs in the lamp is constituted by a discharge bulb having a passing beam function, and the two discharge bulbs are constituted by one high voltage. Since the lighting is controlled by the generation circuit, it is possible to suppress an increase in the size of the device.
[0018]
In addition, since the switching between the functions is performed after the stable lighting of the discharge bulb exhibiting the frequently used passing beam function, the switching can be performed under the stable voltage of the high-voltage generating circuit, so that the response can be performed at a high response speed. Can be.
[0019]
According to a second aspect of the present invention, there is provided the four-lamp headlamp device according to the first aspect,
The high-voltage generation circuit includes a circuit main body on which control electronic components and the like are mounted, and a lead wire portion connecting the circuit main body and the two discharge bulbs. The discharge bulb, which is provided at a substantially central portion between the two discharge bulbs and does not interfere with the reflector, and has the passing beam function, has a light emission center portion behind the circuit body portion. , Is provided so as to be displaced so as to be located at.
[0020]
For this reason, in the second aspect of the present invention, the discharge bulb having the passing beam function that is frequently used is provided such that its light emission center is displaced behind the circuit main body of the high voltage generation circuit. Therefore, the circuit body can minimize the influence of heat from the light emission center.
[0021]
According to a third aspect of the present invention, there is provided the four-lamp headlamp device according to the second aspect,
The lead wire portion is provided so as to be led out from a biased portion on the rear side of the circuit body portion, which is closer to the discharge bulb side and has the passing beam function.
[0022]
For this reason, according to the third aspect of the present invention, since the lead wire portion is led out from the biased portion closer to the discharge bulb side that performs the passing beam function, the lead wire portion on the discharge valve side that performs the passing beam function accordingly. Can be designed to be short, and the shortened lead wire portion can reduce the capture of noise during lighting of the discharge bulb having the passing beam function.
[0023]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings. Components having the same functions as those shown in FIGS. 5 to 7 are denoted by the same reference numerals, and detailed description thereof will be omitted.
[0024]
FIGS. 1 and 2 show a four-lamp headlamp device 1 according to a first embodiment of the present invention. In this headlamp device 1, two discharge bulbs 2 and 2 are provided in each of a pair of lamps with reflectors 4 and 40, respectively, and each discharge bulb 2 has a first shade 12 and a second shade 12 respectively. The entire structure is provided with a shade 13. In the drawing, only one of the pair of lamps is shown. In the drawing, reference numeral 8 indicates a front glass, reference numeral 9 indicates a lamp housing, and reference numeral 10 indicates a facing.
[0025]
At this time, one of the two discharge bulbs 2 and 2 is constituted by a first discharge bulb 20 having at least a passing beam function, and the two discharge bulbs 2 and 2 are connected to one high voltage Power is supplied by the generator circuit 11. The other one of the two discharge bulbs 2 is constituted by a second discharge bulb 21 having a function other than the passing beam function.
[0026]
The reflector 4 reflects light from the discharge bulb 20 to obtain a predetermined low beam light distribution pattern, and reflects light from the discharge bulb 20 together with the first reflection surface 4a to form a predetermined high beam. And the second reflection surface 4b from which the light distribution pattern described above can be obtained. Here, the low-beam light distribution pattern is the above-described low-beam light distribution pattern LP (see FIG. 6), and the high-beam light distribution pattern is the above-described high-beam light distribution pattern HP (see FIG. 7). That is. The reflector 40 has a uniform parabolic reflection surface 40a.
[0027]
Further, the shade 12 includes a fixed shade 5 that blocks direct light that is directly radiated forward in the light from the discharge bulb 20 other than light reflected by the first reflection surface 4a and the second reflection surface 4b, and a fixed shade 5. In the shade 5, the light distribution pattern of the low beam and the light distribution pattern of the high beam are arranged so as to be switchably movable between a low beam position where the light distribution pattern of the low beam is obtained and a high beam position where the light distribution pattern of the high beam is obtained. And a driving means (not shown) for switching the movable shade 6 between the low beam position and the high beam position. The fixed shade 5 and the movable shade 6 are attached with the above-described attachment structure. The driving unit has the same configuration as the driving unit 7 described above. The shade 13 is composed of only the fixed shade 5.
[0028]
The high-voltage generating circuit 11 supplies power to the discharge bulbs 20 and 21 via two first and second lead wires 14a and 14b constituting the lead wire portion 14, respectively.
[0029]
In the first embodiment, the two discharge bulbs 2 include a first discharge bulb 20 that switches between a traveling beam function and a passing beam function by switching the movable shade 6 in a lighting state, and another discharge bulb function other than the passing beam function. The second discharge bulb 21 has a function, for example, any one of a fog lamp, a daytime running lamp, and a bending lamp.
[0030]
In the four-lamp headlamp apparatus 1 configured as described above, the lighting control of the two discharge bulbs 20 and 21 is performed by one high-voltage generation circuit 11, so that the apparatus can be prevented from being enlarged. Can be.
[0031]
Further, in the first embodiment, the switching between the functions is performed between the traveling beam function and the passing beam function, or between the passing beam function and any one of the fog lamp, the daytime running lamp, and the bending lamp. Is what is done. The switching between these functions is performed after the stable lighting of the discharge bulb 20 having the frequently used passing beam function, so that the switching can be performed under the stable voltage of the high-voltage generating circuit 11, thereby performing the quick response speed. be able to.
[0032]
Further, in the first embodiment, any one of the functions such as a fog lamp, a daytime running lamp, and a bending lamp, which are more frequently used than the traveling beam function, is performed by the second discharge bulb 21. The frequency with which the four discharge lamps are turned on simultaneously with the first discharge bulb 20 having the function is increased, and the visibility and design at night are improved.
[0033]
Also, preferably, the four-lamp headlamp apparatus 1 is configured such that the positional relationship between the high-voltage generating circuit 11 and the first discharge bulb 20 having the passing beam function is set as follows, as in the present embodiment. You.
[0034]
That is, as shown in FIG. 2, the high voltage generation circuit 11 includes a circuit body 15 on which control electronic components and the like are mounted, the circuit body 15 and the two first and second discharge bulbs 20 and 21. And a circuit body 15 is provided in a substantially central portion between the two discharge bulbs 20 and 21 and at a portion that does not interfere with the reflectors 4 and 40. In addition, the first discharge bulb 20 having the passing beam function is provided so as to be displaced such that the light emission center portion 20a is located behind the circuit body portion 15.
[0035]
The circuit main body 15 is configured by mounting a circuit board or the like (not shown) on which control electronic components and the like are mounted in a metal case, and is covered with a facing 10 or the like to avoid visual recognition from the outside. It is installed in an appropriate position in the lamp housing 9 in a state. The lead wire portion 14 has a base end connected to the circuit body 15 and first and second lead wires 14a and 14b provided with connectors 16 and 17 at the respective distal ends. , 17 (see FIG. 1) are connected to the respective sockets 3, 3 of the first and second discharge bulbs 20, 21, respectively, to constitute a power supply structure.
[0036]
According to this configuration, the first discharge bulb 20 having a frequently used passing beam function is provided such that its emission center portion 20a is displaced behind the circuit main body portion 15 of the high voltage generation circuit 11. Therefore, the circuit main body 15 can minimize the influence of heat from the light emission center 20a. Thereby, thermal deterioration of the control electronic components and the like of the circuit main body 15 can be suppressed as much as possible, and the operation of these electronic components can be stabilized.
[0037]
More preferably, as in the present embodiment, the four-lamp headlamp apparatus 1 has a positional relationship between the lead wire portion 14 of the high-voltage generating circuit 11 and the first discharge bulb 20 having the passing beam function as follows. It is configured by setting.
[0038]
That is, as shown in FIGS. 1 and 2, the lead wire portion 14 is provided so as to be led out from a bias portion A on the rear side of the circuit body portion 15 near the first discharge bulb 20 which has a low beam function. ing.
[0039]
According to this configuration, since the lead wire portion 14 is led outward from the biased portion A closer to the first discharge bulb 20 having the passing beam function, the lead wire 14a on the first discharge bulb 20 side is shortened accordingly. The lead wire 14a can be designed, and the lead wire 14a can reduce the noise taken in when the first discharge bulb 20 is turned on, thereby suppressing the malfunction of the control and the decrease in the stability of the power supply voltage as much as possible. Therefore, stable operation of the high voltage generation circuit 11 can be ensured.
[0040]
FIG. 3 shows a four-lamp headlamp device 30 according to a second embodiment of the present invention. The headlamp device 30 has the same configuration as the above-described headlamp device 1 except that the functions of the two discharge bulbs 2 are different.
[0041]
That is, in the headlamp device 30, the two discharge bulbs 2 switch between a passing beam function and any one of a fog lamp, a daytime running lamp, and a bending lamp by switching the movable shade 6 in a lighting state. It comprises a third discharge bulb 22 and a fourth discharge bulb 23 having a traveling beam function.
[0042]
Since the headlamp device 30 configured as described above has a single configuration having only the traveling beam function using the fourth discharge bulb 23 and the reflector 40, it is easy to irradiate light to a distant place.
[0043]
FIG. 4 shows a four-lamp type headlamp device 31 as a third embodiment of the present invention. The headlamp device 31 has the same configuration as the above-described headlamp device 1 except that the functions performed by the two discharge bulbs 2 are different.
[0044]
That is, in the headlamp device 31, the two discharge bulbs 2 include a fifth discharge bulb 24 having a passing beam function, a running beam function by switching the movable shade 6 in a lighting state, a fog lamp, a daytime running lamp, and the like. And a sixth discharge bulb 25 that switches between any one of functions such as a bending lamp. At this time, the fifth and sixth discharge bulbs 24 and 25 are configured with reflectors 40 and 4, respectively.
[0045]
Since the headlamp device 31 configured as described above has a single configuration that performs only the passing beam function using the fifth discharge bulb 24 and the reflector 40, it is possible to secure light distribution performance equivalent to that of the related art, Since the sixth discharge bulb 25 performs the function of the traveling beam, which is used infrequently, and any one of the fog lamp, the daytime running lamp, and the bending lamp, the fifth discharge bulb 24 that performs the passing beam function is also provided. The frequency at which the lamps are turned on simultaneously increases, and the visibility and design at night are improved.
[0046]
Further, the headlamp devices 30 and 31 can suppress an increase in the size of the headlamp devices 30 and 31 and can provide a fast response speed when switching between functions, due to the same configuration as the headlamp device 1. In the same manner as in the headlamp device 1, the positional relationship between the high-voltage generating circuit 11 and the third (fifth) discharge bulb 22 (24) having a passing beam function and the passing beam function with the lead wire portion 14 are exhibited. Since it has a positional relationship with the third (fifth) discharge bulb 22 (24), it is possible to minimize thermal degradation of electronic components and noise pickup, and furthermore, the operation of the high voltage generation circuit 11 Can be stabilized.
[0047]
【The invention's effect】
As described in detail above, according to the first aspect of the present invention, one of the two discharge bulbs in the lamp is constituted by a discharge bulb having a passing beam function, and the two discharge bulbs are provided. Is controlled by a single high-voltage generating circuit, so that despite the multi-functionalization achieved by increasing the number of discharge bulbs, it is possible to suppress an increase in the size of the device and to reduce the number of functions. It is possible to provide a four-lamp type headlamp device capable of performing switching at a high response speed under a stable voltage of the high voltage generation circuit.
[0048]
According to the second aspect of the present invention, the discharge bulb having a frequently-used passing beam function is provided such that its emission center is displaced behind the circuit body of the high-voltage generating circuit. Therefore, in addition to the effect of the first aspect of the present invention, in addition to the effect of the first aspect, the circuit main body can minimize the influence of heat from the light emission center part, and further stabilize the operation of the high voltage generation circuit. it can.
[0049]
According to the third aspect of the present invention, since the lead wire portion is led out from the biased portion closer to the discharge bulb side that performs the passing beam function, the lead wire on the discharge valve side that performs the passing beam function. The length of the lead wire portion can be designed to be short, and the lead wire portion can reduce the intake of noise at the time of lighting of the discharge bulb having the passing beam function. In addition, it is possible to minimize noise pickup, and to stabilize the operation of the high-voltage generating circuit.
[Brief description of the drawings]
FIG. 1 is a front view of one lamp of a four-lamp type headlamp device as a first embodiment of the present invention.
FIG. 2 is a schematic cross-sectional view of one lamp of a four-lamp type headlamp device as a first embodiment of the present invention.
FIG. 3 is a schematic cross-sectional view of one lamp of a four-lamp headlamp device according to a second embodiment of the present invention.
FIG. 4 is a schematic cross-sectional view of one lamp of a four-lamp headlamp device according to a third embodiment of the present invention.
FIG. 5 is a schematic sectional view of one lamp of a conventional headlamp device.
FIG. 6 is a light distribution pattern of a low beam of the headlamp device of FIG. 5;
FIG. 7 is a light distribution pattern of a high beam of the headlamp device of FIG. 5;
[Explanation of symbols]
1,30,314 4-lamp type headlamp device (headlamp device)
2 Discharge bulbs 4, 40 Reflector 11 High voltage generation circuit 14 Lead wire 15 Circuit main body 20 First discharge bulb (discharge bulb)
20a Light emission center 21 Second discharge bulb (discharge bulb)
22 Third discharge bulb (discharge bulb)
23 4th discharge bulb (discharge bulb)
24 5th discharge bulb (discharge bulb)
25 6th discharge bulb (discharge bulb)
A bias part

Claims (3)

In a four-lamp headlamp device in which two discharge bulbs are provided with a reflector in each of a pair of lamps,
One of the two discharge bulbs is constituted by a discharge bulb having at least a passing beam function, and the other one is constituted by a discharge bulb having other functions. A four-lamp type headlamp device, wherein the discharge bulb is supplied with power by one high voltage generating circuit. The four-light headlamp device according to claim 1,
The high-voltage generation circuit includes a circuit main body on which control electronic components and the like are mounted, and a lead wire portion connecting the circuit main body and the two discharge bulbs. The discharge bulb, which is provided at a substantially central portion between the two discharge bulbs and does not interfere with the reflector, and has the passing beam function, has a light emission center portion behind the circuit body portion. A four-lamp type headlamp device, wherein the four-lamp headlamp device is provided so as to be displaced so as to be located at a position. The four-lamp headlamp device according to claim 2,
The four-lamp type headlamp device, wherein the lead wire portion is provided so as to be led out of a rearward portion of the circuit main body portion, which is closer to a discharge bulb side that performs the passing beam function.

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