JP4488633B2 - Irradiation direction variable headlamp device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an irradiation direction variable headlamp device in which a light irradiation direction is swung in a direction transverse to a traveling direction.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, as a headlamp device for an automobile, for example, a headlamp device provided with an auxiliary lamp adjacent to a fixed passing beam so that the light irradiation direction is swung laterally with respect to the traveling direction is known. .
[0003]
The headlamp device provided with such an auxiliary lamp is configured as shown in FIG. 10, for example.
In FIG. 10, the headlamp device 1 is disposed on both sides of the front part of the automobile (only one side, for example, the right side headlamp device is shown in FIG. 10). The lamps provided side by side, that is, the lamp 2 for the low beam and the auxiliary lamp 4 are provided.
[0004]
The above-mentioned low beam lamp 2 irradiates a so-called low beam, and is housed in the housing 3 and supplied with electric power from a lighting device (not shown), so that it moves slightly downward with respect to the front. To irradiate light.
[0005]
The auxiliary lamp 4 is disposed adjacent to the lower side of the lamp 2 in the housing 3.
The auxiliary lamp 4 is a so-called swivel lamp, and is supported in the housing 3 so as to be swingable around a rotating shaft 5 extending vertically.
Specifically, as shown in FIG. 11A, the auxiliary lamp 4 includes a bulb 4a and a reflector 4b disposed behind the bulb 4a, and the bulb 4a and the reflector 4b rotate integrally. It swings around the shaft 5.
The auxiliary lamp 4 is rotated around the rotation shaft 5 according to the steering angle θst of the automobile, for example, so as to irradiate light toward the traveling direction of the automobile according to the steering angle θst. Yes.
[0006]
According to the headlamp device 1 having such a configuration, the low beam lamp 2 is turned on during traveling, and as a whole irradiates light slightly downward from the horizon toward the front, thereby dazzling the oncoming vehicle. In order to avoid this, a low-pass beam is irradiated.
[0007]
Further, the auxiliary lamp 4 emits light at a swivel angle θsw of approximately 0 degrees toward the front as shown in FIG. 11A during normal driving, that is, when the automobile is traveling straight. When the vehicle is cornering or turning right or left, the vehicle is rotated around the rotation shaft 5 according to the steering angle θst of the vehicle. For example, in the case of a right turn, as shown in FIG. By moving the light irradiation direction in the horizontal direction, the light is irradiated toward the traveling direction of the vehicle at the steering angle θst.
Here, the swivel angle θsw is set to a maximum value of about 25 to 40 degrees, for example, and when the steering is operated to the right, the auxiliary lamp 4 of the right headlamp device 1 changes the light irradiation direction to the right. When the steering is operated to the left, the auxiliary lamp 4 of the left headlamp device 1 moves the light irradiation direction to the left. Alternatively, the auxiliary lamps 4 of both headlamp devices 1 may be moved regardless of which direction the steering is operated.
[0008]
[Problems to be solved by the invention]
By the way, in the headlamp device 1 having such a configuration, the light irradiation direction of the auxiliary lamp 4 moves in the horizontal direction when cornering or turning left and right, but the auxiliary lamp 4 is moved in any direction. It is comprised so that light may always be irradiated with the same lighting rate (illuminance).
[0009]
However, when the swivel angle θsw is small, the lamp 2 of the headlamp device 1 is turned on, and light is emitted toward the front of the automobile. Therefore, the auxiliary lamp 4 is substantially unnecessary. As a result, limited battery power is wasted.
On the other hand, when the vehicle is traveling straight ahead, the auxiliary lamp 4 can be turned off, and the auxiliary lamp 4 can be turned on when the swivel angle θsw exceeds a predetermined angle. Sudden lighting will cause the driver and other automobile drivers and pedestrians to feel uncomfortable.
[0010]
Further, the swing speed when the light irradiation direction by the auxiliary lamp 4 moves in the horizontal direction is always constant. For this reason, when the swivel angle θsw changes greatly when the vehicle enters a steep corner from straight running or when turning right or left, the time required from the current value of the swivel angle to the target value becomes longer. You may not be able to quickly irradiate light along the corner curves or along the shoulders of intersections.
[0011]
In view of the above, an object of the present invention is to provide an irradiation direction variable headlamp device that is turned off when traveling straight ahead and is turned on without a sense of incongruity during cornering or the like with a simple configuration.
[0012]
[Means for Solving the Problems]
According to the first aspect of the present invention, the above object is provided at the left and right ends of the front part of the automobile, the lamp for irradiating light substantially toward the front of the automobile, and the lamp on the rotating shaft. In an irradiation direction variable headlamp device comprising a drive control means that swings around and moves the light irradiation direction in a horizontal direction, and a lighting device that supplies power to the lamp, forward of the light irradiation direction by the lamp Detecting means for detecting a deviation angle (swivel angle) from the lamp, and the lighting device increases the lamp lighting rate in accordance with the size of the swivel angle detected by the detecting means. This is achieved by an irradiation direction variable headlamp device.
[0013]
In this first aspect, the lighting device controls the lighting of the lamp so that the swivel angle is 0 and the lamp is extinguished, and the swivel angle is the maximum and the lamp has the maximum lighting rate. Therefore, when the automobile is traveling straight ahead, light is irradiated to the front of the automobile by a low beam or the like, so that the lamp is turned off, and wasteful battery consumption can be prevented.
[0014]
Further, when the vehicle is cornering or turning right or left, the lamp is swung around the rotation axis by the drive control means and is controlled to be lit by the lighting device, and the swivel angle is increased according to the swivel angle by the drive control means. The higher the lighting rate of the lamp.
As a result, the driver can ensure safety more reliably by visually recognizing a visual object such as a road shoulder or a pedestrian illuminated by the lamp. At this time, since the lamp is lit brighter as the swivel angle increases, the lamp does not turn on suddenly and does not give an uncomfortable feeling to the driver, the driver of the other car or the pedestrian.
[0015]
The irradiation direction variable headlamp device according to the second aspect of the present invention is the irradiation direction variable headlamp device according to the first aspect, wherein the lamp rotates substantially perpendicular to the bulb in which the lamp is fixedly arranged. And a reflector supported so as to be swingable around an axis, and the drive control means moves the light irradiation direction in a horizontal direction by swinging the reflector around the rotation axis. Let
In this second aspect, only the reflector constituting the lamp is swung around the rotation axis by the drive control means, whereby the light irradiation direction is moved in the horizontal direction.
[0016]
The irradiation direction variable headlamp device according to the third aspect of the present invention is the irradiation direction variable headlamp device according to the first or second aspect, wherein the lighting device linearly switches the swivel angle from 0 to a maximum value. Control the lighting rate.
In this third aspect, since the lighting device linearly controls the lamp lighting rate, when the lamp is swung by the drive control means, the brightness of the lamp fluctuates smoothly in a stepless manner. The sense of incongruity given to the person or the like is completely eliminated.
[0017]
An irradiation direction variable headlamp device according to a fourth aspect of the present invention is the irradiation direction variable headlamp device according to the first or second aspect, wherein the lighting device has a swivel angle ranging from 0 to a maximum value stepwise. Control the lighting rate of the lamp
In the fourth aspect, since the lighting device controls the lamp lighting rate step by step, the configuration of the drive control means can be simplified and the cost can be reduced.
[0018]
The irradiation direction variable headlamp device according to the fifth aspect of the present invention is the irradiation direction variable headlamp device according to any one of the first to fourth aspects, wherein the drive control means changes the swivel angle. The current value of the swivel angle is compared with the target value, and the change speed of the swivel angle, that is, the ramp swing speed is controlled according to the difference between the current value and the target value.
In this fifth aspect, when the ramp is further swung by the drive control means from the current value of the swivel angle to the target value, if the difference between the current value and the target value is large, the lamp swings at high speed. As a result, the lamp is quickly swung to the swivel angle that is the target value, and the light from the lamp is quickly irradiated along the traveling direction of the automobile. It is possible to more reliably illuminate a visual object such as a road shoulder or a pedestrian. When the difference between the current value and the target value is small, the lamp is swung at a low speed, so that the lamp is swung slowly to the swivel angle that is the target value, and the light from the lamp is In response to the driver's steering turning at a minute angle, the driver does not shake quickly, so that the driver does not feel uncomfortable.
[0020]
The irradiation direction variable headlamp device according to the sixth aspect of the present invention is the irradiation direction variable headlamp device according to the fifth aspect, wherein the drive control means is configured to respond to a difference between a current value of the swivel angle and a target value. Control the ramp swing speed linearly. In the sixth aspect, since the drive control means linearly controls the swing speed of the lamp, the swing of the lamp is performed more smoothly, and the uncomfortable feeling given to the driver or the like is completely eliminated. It will be.
[0021]
The irradiation direction variable headlamp device according to the seventh aspect of the present invention is the irradiation direction variable headlamp device according to the fifth aspect, wherein the drive control means is configured to respond to the difference between the current value of the swivel angle and the target value. The ramp swing speed is controlled step by step. In the seventh aspect, since the drive control means controls the rocking speed of the lamp in a stepwise manner, the configuration of the drive control means can be simplified and the cost can be reduced.
[0022]
An irradiation direction variable headlamp device according to an eighth aspect of the present invention is the irradiation direction variable headlamp device according to any one of the fifth to seventh aspects, wherein the drive control means includes a current value and a target value of a swivel angle. The difference is calculated by the moving average value. In the eighth aspect, the drive control means calculates the difference between the current value of the swivel angle and the target value based on the moving average value, whereby the current value of the swivel angle fluctuates by a minute angle. However, the swivel angle changes in a stable state, and the uncomfortable feeling given to the driver or the like is reduced.
[0023]
An irradiation direction variable headlamp device according to a ninth aspect of the present invention is the irradiation direction variable headlamp device according to any one of the fifth to eighth aspects, wherein the drive control means includes a current value of a swivel angle and a target value. Based on the difference, the swing speed of the lamp is determined by calculation. In this ninth aspect, the drive control means determines the lamp swing speed by calculation based on the difference between the current value of the swivel angle and the target value, so that the lamp swing speed is always determined accurately. Can do.
[0024]
The irradiation direction variable headlamp device according to the tenth aspect of the present invention is the irradiation direction variable headlamp device according to any one of the fifth to eighth aspects, wherein the drive control means includes a current value and a target value of a swivel angle. Based on the difference, the ramp swing speed is determined by a preset table. In the tenth aspect, the drive control means determines the ramp swing speed based on the table set in advance based on the difference between the current value and the target value of the swivel angle. Can be determined.
[0025]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, preferred embodiments of the present invention will be described in detail with reference to FIGS. 1 to 9.
The embodiments described below are preferable specific examples of the present invention, and thus various technically preferable limitations are given. However, the scope of the present invention particularly limits the present invention in the following description. As long as there is no description of the effect, it is not restricted to these aspects.
[0026]
FIG. 1 shows a configuration of an embodiment of an irradiation direction variable headlamp device according to the present invention.
In FIG. 1, the irradiation direction variable headlamp device 10 is disposed on both sides of the front portion of the automobile, and each has two lamps arranged side by side, that is, a lamp for a low beam (not shown) and Auxiliary lamps 11L and 11R are provided.
Here, the lamp for the low beam irradiates a so-called low beam, and is housed in the housings 12L and 12R, and is supplied with electric power by a lighting device (not shown). Light is emitted toward the front slightly downward.
[0027]
The auxiliary lamps 11L and 11R are so-called swivel lamps, which are swingably supported around the rotation shafts 13L and 13R extending substantially vertically in the housings 12L and 12R, respectively. It is turned on when electric power is supplied.
Specifically, as shown in FIG. 2, each of the auxiliary lamps 11L and 11R includes a bulb 11a and a reflector 11b disposed behind the bulb 11a, and the bulb 11a and the reflector 11b rotate together. It swings around the shafts 13L and 13R.
The rotary shafts 13L and 13R are rotationally driven by motors 15L and 15R as driving means, respectively.
[0028]
Here, the motors 15L and 15R are driven and controlled by a control circuit 16 as drive control means.
Further, the drive control circuit 16 receives a signal indicating the steering angle θst from the steering angle detection means 17 for detecting the steering angle θst of the automobile.
[0029]
As a result, as shown in FIG. 2, the auxiliary lamps 11L and 11R are rotated around the rotary shafts 12L and 12R, for example, in accordance with the steering angle θst of the automobile, so that the optical axis of the bulb 11a is moved forward. Is moved sideways by the swivel angle θsw to irradiate light in the direction of travel of the vehicle according to the steering angle θst.
[0030]
The above configuration is the same as that of the conventional irradiation direction variable headlamp device 1, but the irradiation direction variable headlamp device 10 according to the embodiment of the present invention is different in the following points.
That is, the lighting device 14 is configured as shown in FIG.
In FIG. 3, the lighting device 14 includes a swivel angle detection unit 14a as a detection unit that detects the swivel angle θsw of the auxiliary lamps 11L and 11R, and the auxiliary lamps 11L and 11R based on the swivel angle θsw from the swivel angle detection unit 14a. An illuminance calculation unit 14b that determines the lighting rate (illuminance) of the light source and an illuminance output unit 14c that drives the auxiliary lamps 11L and 11R according to the lighting rate determined by the illuminance calculation unit 14b.
[0031]
The swivel angle detector 14a is configured to detect the amount of rotation of the rotating shafts 13L and 13R with a rotary encoder or the like, and a signal corresponding to the amount of rotation of the rotating shafts 13L and 13R, that is, the swivel angle θsw, or a calculated value. (Target value) is output.
[0032]
Based on the signal corresponding to the swivel angle θsw from the swivel angle detection unit 14a, the illuminance calculation unit 14b sets the lighting rates of the auxiliary lamps 11L and 11R to 0% when the swivel angle θsw is 0, as shown in FIG. , The lighting rates of the auxiliary lamps 11L and 11R are linearly calculated so that the lighting rates of the auxiliary lamps 11L and 11R become 100% when the swivel angle θsw is the maximum value.
The illuminance calculation unit 14b may determine the lighting rates of the auxiliary lamps 11L and 11R in a stepwise manner, as shown in FIG. 5, corresponding to the swivel angle θsw.
[0033]
The illuminance output unit 14c supplies each auxiliary lamp 11L, 11R to the auxiliary lamps 11L, 11R based on the lighting rate of the auxiliary lamps 11L, 11R determined by the illuminance calculation unit 14b. It is made to light at a predetermined lighting rate.
[0034]
Further, as shown in FIG. 6, the control circuit 16 as the drive control means includes a swivel angle calculation unit 16a, a moving average calculation unit 16b, a motor speed determination unit 16c, and an output circuit 16d. Yes.
[0035]
The swivel angle calculation unit 16a is configured to calculate the swivel angle θsw to be targeted based on the steering angle θst detected by the steering angle detection means 17.
[0036]
The moving average calculator 16b calculates a difference between the target value of the swivel angle θsw sequentially calculated by the swivel angle calculator 16a and the current value of the swivel angle θsw detected by the swivel angle detector 14a. Then, the moving average value A of the difference of the predetermined number of times (for example, 10 times) immediately before is calculated.
[0037]
Based on the moving average value A of the difference between the current value and the target value of the swivel angle θsw from the moving average calculating unit 16b, the motor speed determining unit 16c is configured to rotate the rotating shafts 13L and 13R as shown in the graph of FIG. The rotation speed V is set linearly by calculation.
For example, as shown in FIG. 8, the motor speed determination unit 16c divides the moving average value A into a plurality of ranges, where A1 <A2 <A3 <A4, and when A ≦ A1, the rotational speeds V1, A1 < Rotational speed V2 when A ≦ A2, rotational speed V3 when A2 <A ≦ A3, rotational speed V4 when A3 <A ≦ A4, and rotational speed V5 when A4 <A, that is, in the graph of FIG. As shown, the rotational speed V of the rotating shafts 13L and 13R may be set in a stepwise manner by calculation or based on a previously set table.
Here, the moving average values A1, A2, A3, A4 are set as appropriate, but the rotational speeds V1, V2, V3, V4, V5 are the maximum rotational speeds of the rotary shafts 13L, 13R by the motors 15L, 15R or It is set below that.
[0038]
The output circuit 16d drives and controls the motors 15L and 15R according to the rotation speed set by the motor speed determination unit 16c, thereby rotating the rotation shafts 13L and 13R and swinging the auxiliary lamps 11L and 11R, respectively. Let
[0039]
The irradiation direction variable headlamp device 10 according to the embodiment of the present invention is configured as described above. When the vehicle travels straight, both lamps, that is, lamps for a low beam (not shown) are turned on, so that the whole is slightly below the horizontal line. By irradiating light toward the vehicle, a low beam is emitted so as to avoid glare on the oncoming vehicle.
[0040]
Furthermore, the auxiliary lamps 11L and 11R are in a light-off state with a lighting rate of 0% as shown in the graph of FIG. 4 during normal driving, that is, when the automobile is traveling straight.
Here, when the vehicle is cornering or turning left or right, the steering angle θst is detected by the steering angle detection means 17 due to a change in the steering angle θst of the vehicle, and a detection signal is sent to the control circuit 16.
As a result, the control circuit 16 drives and controls the motor 15L or 15R in response to the detection signal, so that the rotary shaft 13L or 13R is rotationally driven, and the auxiliary lamp 11L or 11R is rotated around the rotary shaft 13L or 13R. Is swung.
[0041]
Accordingly, the swivel angle θsw is changed by the swing of the auxiliary lamp 11L or 11R, and the change of the swivel angle θsw is detected by the swivel angle detection unit 14a of the lighting device 14, and based on the swivel angle θsw. The illuminance calculation unit 14b of the lighting device 14 calculates the lighting rate of the auxiliary lamp 11L or 11R, and the illuminance output circuit 14c drives the auxiliary lamp 11L or 11R based on the calculated lighting rate.
As a result, the auxiliary lamp 11L or 11R is lit by the lighting device 14 at a lighting rate corresponding to the swivel angle θsw, that is, the auxiliary lamps 11L and 11R have a higher lighting rate as the swivel angle θsw increases. Lights on.
[0042]
Therefore, in the case of straight running, the auxiliary lamps 11L and 11R are turned off, and wasteful battery consumption can be prevented. In this case, the front of the automobile is irradiated with sufficient light by a passing beam or the like, and the driver can check the safety of the course.
[0043]
In the case of a left turn, the steering lamp is rotated counterclockwise, and accordingly, the auxiliary lamp 11L is also swung to the left, so that the light irradiation direction moves to the left. As a result, the auxiliary lamp 11L emits light in the direction of travel to the left side of the vehicle at the steering angle θst.
In this way, when the driver turns the steering wheel of the vehicle to the left when turning left or cornering to the left side, the light irradiation direction of the auxiliary lamp 11L moves to the left according to the steering angle θst, and Since the lighting rate is increased, it is possible to more reliably illuminate a visually recognized object such as a shoulder pedestrian or a road sign, and to ensure more reliable safe driving.
[0044]
Further, in the case of a right turn, when the steering wheel is rotated to the right, the auxiliary lamp 11R is also swung to the right, so that the light irradiation direction similarly moves to the right. As a result, the auxiliary lamp 11R emits light in the traveling direction toward the right side of the vehicle at the steering angle θst, and the lighting rate increases.
[0045]
In this way, when the driver turns the steering of the automobile left or right when turning left or right or driving in the left and right corners, the light irradiation direction of the auxiliary lamp 11L or 11R is left or right according to the steering angle θst. As the lighting rate increases, the auxiliary lamps 11L and 11R emit brighter light as they deviate from the light irradiation direction by the low beam. For example, left and right shoulder pedestrians and road signs Thus, it is possible to illuminate a visually recognized object such as a more reliable safe driving.
Further, since the auxiliary lamps 11L and 11R are not suddenly turned on when the vehicle is cornering or turning left or right, the auxiliary lamps 11L and 11R do not give an uncomfortable feeling to the driver, the driver of the other vehicle, or the pedestrian.
[0046]
Further, when the drive control means 16 rotates the rotary shafts 13L, 13R by the motors 15L, 15R, the drive is performed when the difference between the current value of the swivel angle θsw and the target value (here, the moving average value A) is large. The motor speed determination unit 16c of the control means 16 sets the rotation speed V to be high so that the auxiliary lamps 11L and 11R are swung at a high speed, but when the moving average value A is small, the drive control means 16 The motor speed determination unit 16c swings the auxiliary lamps 11L and 11R at a low speed by setting the rotation speed V low.
As a result, when the driver rotates the steering wheel greatly, the variation of the swivel angle θsw is large, and the difference between the current value of the swivel angle θsw and the target value is large, so that the auxiliary lamps 11L and 11R are the target value It is swung quickly to θ. Therefore, the light from the auxiliary lamps 11L and 11R is quickly radiated along the traveling direction of the automobile, and more reliably illuminates a visible object such as a road shoulder or a pedestrian in the traveling direction of the automobile. Can do.
[0047]
On the other hand, when the driver rotates the steering wheel at a slight angle, the fluctuation of the swivel angle θsw is small, and the difference between the current value of the swivel angle θsw and the target value is small, so the auxiliary lamps 11L and 11R are the target values. The swivel angle θ is swung at a low speed. Therefore, for example, even when the driver finely adjusts the steering by a minute angle, the difference between the current value of the swivel angle θsw and the target value is small, and the motor speed determination unit 16c has a moving average value A of the difference. Since the rotation speed V is set based on the above, the auxiliary lamps 11L and 11R do not swing finely, so that the driver does not feel uncomfortable.
[0048]
In the above-described embodiment, the auxiliary lamps 11L and 11R have been described with respect to the case where the bulb 11a and the reflector 11b are integrally formed and oscillated integrally. Obviously, the present invention can be applied to an auxiliary lamp having a configuration in which only the reflector is swung.
In the above-described embodiment, the auxiliary lamp is swung according to the steering angle θst. However, the present invention is not limited to this, and for example, the auxiliary lamp is swung according to the front wheel angle. It may be.
Furthermore, although one of the auxiliary lamps 11L and 11R is swung, both the auxiliary lamps 11L and 11R may be swung simultaneously.
[0049]
【The invention's effect】
As described above, according to the present invention, the lighting device controls the lighting of the lamp so that the swivel angle is 0 and the lamp is turned off, and the swivel angle is the maximum and the lamp has the maximum lighting rate. Therefore, when the automobile is traveling straight ahead, light is irradiated to the front of the automobile by a passing beam or the like, so that the auxiliary lamp is turned off, and wasteful battery consumption can be prevented.
[0050]
Further, when the vehicle is cornering or turning right or left, the lamp is swung around the rotation axis by the drive control means and is controlled to be lit by the lighting device, and the swivel angle is increased according to the swivel angle by the drive control means. The higher the lighting rate of the lamp.
As a result, the driver can ensure safety more reliably by visually recognizing a visual object such as a road shoulder or a pedestrian illuminated by the lamp. At this time, since the lamp is lit brighter as the swivel angle increases, the lamp does not turn on suddenly and does not give an uncomfortable feeling to the driver, the driver of the other car or the pedestrian.
[0051]
When the drive control means changes the swivel angle, the current value of the swivel angle is compared with the target value, and the change speed of the swivel angle, that is, the ramp swing speed is determined according to the difference between the current value and the target value. In the case of control, when the lamp is swung by the drive control means from the current value of the swivel angle to the target value, the lamp is swung at a high speed if the difference between the current value and the target value is large. As a result, the lamp is quickly swung to the swivel angle which is the target value, and the light from the lamp is quickly irradiated along the traveling direction of the automobile. It is possible to more reliably illuminate a visually recognized object such as a road shoulder or a pedestrian. When the difference between the current value and the target value is small, the lamp is swung at a low speed, so that the lamp is swung slowly to the swivel angle that is the target value, and the light from the lamp is In response to the driver's steering turning at a minute angle, the driver does not shake quickly, so that the driver does not feel uncomfortable.
[0052]
In this way, according to the present invention, an extremely excellent irradiation direction variable headlamp device can be provided which has a simple configuration and is turned off when traveling straight and turned on without feeling uncomfortable during cornering. .
[Brief description of the drawings]
FIG. 1 is a block diagram of an embodiment of an irradiation direction variable headlamp device according to the present invention.
2 is a schematic plan view showing the swing of an auxiliary lamp in the headlamp device of FIG. 1. FIG.
3 is a block diagram showing a configuration of a lighting device in the headlamp device of FIG. 1. FIG.
4 is a graph showing a relationship between a swivel angle θsw of an auxiliary lamp controlled by the lighting device of FIG. 3 and a lighting rate. FIG.
FIG. 5 is a graph showing a modification of the relationship between the swivel angle θsw of the auxiliary lamp and the lighting rate controlled by the lighting device of FIG. 3;
6 is a block diagram showing a configuration of a control circuit in the headlamp device of FIG. 1. FIG.
7 is a graph showing the relationship between the current value of the swivel angle θsw of the auxiliary lamp controlled by the control circuit of FIG. 6 and the difference between the target value and the swivel speed.
8 is a table showing a modification of the relationship between the current value of the swivel angle θsw of the auxiliary lamp controlled by the control circuit of FIG. 6 and the difference between the target value and the swivel speed.
9 is a graph showing the relationship of FIG.
FIG. 10 is a schematic front view showing a configuration of an example of a conventional irradiation direction variable headlamp device.
11 is a schematic plan view showing (A) a non-oscillation state and (B) an oscillation state of an auxiliary lamp in the headlamp device of FIG.
[Explanation of symbols]
10. Irradiation direction variable headlamp device
11L, 11R Auxiliary lamp (lamp)
12L, 12R housing
13L, 13R Rotating shaft
14 Lighting device
14a swivel angle detector
14b Illuminance calculation unit
14c Illuminance output circuit
15L, 15R motor
16 Control circuit (drive control means)
16a swivel angle calculator
16b Moving average calculator
16c Motor speed judgment part
16d output circuit
17 Steering angle detection means

Claims (10)

Equipped at the left and right ends of the front part of the car, a lamp that irradiates light substantially toward the front of the car, and the lamp oscillates around the rotation axis to move the light irradiation direction horizontally In an irradiation direction variable headlamp device comprising: a drive control means for driving; and a lighting device for supplying power to the lamp.
It has a detecting means for detecting a deviation angle (swivel angle) from the front of the light irradiation direction by the lamp,
An illumination direction variable headlamp device characterized in that the lighting device increases the lighting rate of the lamp in accordance with the swivel angle detected by the detecting means. The lamp is composed of a fixedly arranged bulb and a reflector supported so as to be swingable around a rotation axis substantially perpendicular to the direction of the bulb, and the drive control means controls the reflector. 2. The irradiation direction variable headlamp device according to claim 1, wherein the irradiation direction of light is moved in a horizontal direction by swinging around a rotation axis.   The irradiation direction variable headlamp according to claim 1 or 2, wherein the lighting device linearly controls the lamp lighting rate from a swivel angle of 0 to a maximum value.   The irradiation direction variable headlamp according to claim 1, wherein the lighting device controls the lighting rate of the lamp in a stepwise manner from a swivel angle of 0 to a maximum value.   When the drive control means changes the swivel angle, the current value of the swivel angle is compared with the target value, and the change speed of the swivel angle, that is, the ramp swing speed is determined according to the difference between the current value and the target value. The irradiation direction variable headlamp according to claim 1, wherein the irradiation direction variable headlamp is controlled. 6. The irradiation direction variable headlamp according to claim 5, wherein the drive control means linearly controls the swing speed of the lamp in accordance with the difference between the current value of the swivel angle and the target value. 6. The irradiation direction variable head lamp according to claim 5, wherein the drive control means controls the swing speed of the lamp in a stepwise manner in accordance with a difference between a current value of the swivel angle and a target value. 8. The irradiation direction variable headlamp according to claim 5, wherein the drive control means calculates a difference between a current value of the swivel angle and a target value based on a moving average value. 9. The irradiation direction variable according to claim 5, wherein the drive control means determines the lamp swing speed by calculation based on the difference between the current value of the swivel angle and the target value. head lamp. 9. The drive control unit according to claim 5, wherein the driving speed of the lamp is determined based on a difference between a current value of the swivel angle and a target value, according to a preset table. Irradiation direction variable headlamp described in 1.

Images