JP5260098B2 - Vehicle headlamp device - Google Patents

Vehicle headlamp device Download PDF

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Publication number
JP5260098B2
JP5260098B2 JP2008074442A JP2008074442A JP5260098B2 JP 5260098 B2 JP5260098 B2 JP 5260098B2 JP 2008074442 A JP2008074442 A JP 2008074442A JP 2008074442 A JP2008074442 A JP 2008074442A JP 5260098 B2 JP5260098 B2 JP 5260098B2
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Japan
Prior art keywords
lamp
distribution pattern
vehicle
light distribution
light
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JP2008074442A
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JP2009227088A (en
Inventor
聡志 山村
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株式会社小糸製作所
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60QARRANGEMENT OF SIGNALLING OR LIGHTING DEVICES, THE MOUNTING OR SUPPORTING THEREOF OR CIRCUITS THEREFOR, FOR VEHICLES IN GENERAL
    • B60Q1/00Arrangements or adaptations of optical signalling or lighting devices
    • B60Q1/02Arrangements or adaptations of optical signalling or lighting devices the devices being primarily intended to illuminate the way ahead or to illuminate other areas of way or environments
    • B60Q1/04Arrangements or adaptations of optical signalling or lighting devices the devices being primarily intended to illuminate the way ahead or to illuminate other areas of way or environments the devices being headlights
    • B60Q1/14Arrangements or adaptations of optical signalling or lighting devices the devices being primarily intended to illuminate the way ahead or to illuminate other areas of way or environments the devices being headlights having dimming means
    • B60Q1/1415Dimming circuits
    • B60Q1/1423Automatic dimming circuits, i.e. switching between high beam and low beam due to change of ambient light or light level in road traffic
    • B60Q1/143Automatic dimming circuits, i.e. switching between high beam and low beam due to change of ambient light or light level in road traffic combined with another condition, e.g. using vehicle recognition from camera images or activation of wipers
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21LIGHTING
    • F21SNON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S41/00Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
    • F21S41/60Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by a variable light distribution
    • F21S41/68Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by a variable light distribution by acting on screens
    • F21S41/683Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by a variable light distribution by acting on screens by moving screens
    • F21S41/689Flaps, i.e. screens pivoting around one of their edges
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60QARRANGEMENT OF SIGNALLING OR LIGHTING DEVICES, THE MOUNTING OR SUPPORTING THEREOF OR CIRCUITS THEREFOR, FOR VEHICLES IN GENERAL
    • B60Q2300/00Indexing codes for automatically adjustable headlamps or automatically dimmable headlamps
    • B60Q2300/05Special features for controlling or switching of the light beam
    • B60Q2300/056Special anti-blinding beams, e.g. a standard beam is chopped or moved in order not to blind
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60QARRANGEMENT OF SIGNALLING OR LIGHTING DEVICES, THE MOUNTING OR SUPPORTING THEREOF OR CIRCUITS THEREFOR, FOR VEHICLES IN GENERAL
    • B60Q2300/00Indexing codes for automatically adjustable headlamps or automatically dimmable headlamps
    • B60Q2300/40Indexing codes relating to other road users or special conditions
    • B60Q2300/41Indexing codes relating to other road users or special conditions preceding vehicle

Description

  The present invention relates to a vehicle headlamp device used in an automobile or the like.

  In general, a vehicle headlamp apparatus can switch between a low beam and a high beam. The low beam illuminates the neighborhood with a predetermined illuminance, and the light distribution regulation is determined so as not to give glare to the oncoming vehicle and the preceding vehicle, and is mainly used when traveling in an urban area. On the other hand, the high beam illuminates a wide area in the front and a distant area with a relatively high illuminance, and is mainly used when traveling at high speed on a road with few oncoming vehicles and preceding vehicles.

In the vehicle headlamp device, in order to improve the visibility of the road surface in front of the vehicle when the vehicle is turning, the lamp unit supported so as to be rotatable in the left-right direction or the up-down direction is controlled to rotate according to the vehicle traveling condition. (For example, patent document 1). By changing the direction of the beam irradiated from the lamp unit, it is possible to perform the beam irradiation with a light distribution pattern that immediately responds to the vehicle running condition.
JP 2003-123514 A

  The high beam is more visible to the driver than the low beam, but glare is given to the driver of the vehicle traveling in front of the vehicle (hereinafter referred to as the “front vehicle”). In order to avoid this, it is conceivable to change the direction of the beam emitted from the lamp unit so as to avoid the position of the front vehicle using a vehicle headlamp device as described in Patent Document 1 above. . However, if it does in this way, it will become impossible to irradiate the road surface ahead of vehicles sufficiently, and there is a problem that visibility will fall.

  The present invention has been made in view of such a situation, and an object of the present invention is to improve the visibility of the road by sufficiently irradiating the road surface ahead of the vehicle without giving glare to the driver of the preceding vehicle. It is to provide.

  One embodiment of the present invention is a vehicle headlamp device. This device shields a part of the light emitted from the light source of the first lamp and the second lamp and the first lamp that irradiates the region including the upper side from the cut-off line of the low beam light distribution pattern, and at least from the vertical line. A first variable shade means provided in the first lamp so as to form a first light distribution pattern having a light-shielding area on the left side and configured to be able to change the width of the light-shielding area, and emitted from the light source of the second lamp A second lamp is provided in the second lamp so as to form a second light distribution pattern having a light shielding region at least on the right side of the vertical line by shielding a part of the light, and configured to change the width of the light shielding region. The vehicle position where the variable shade means, the vehicle position detection means for detecting the vehicle position ahead, and the overall light distribution pattern obtained by superimposing the first light distribution pattern and the second light distribution pattern are detected by the vehicle position detection means. So as to form a light shielding region combined, and a control means for controlling the width of the light shielding region of the first variable shade means and the second variable shade means.

According to this aspect, in the headlamp device that forms the entire light distribution pattern by combining the two light distribution patterns irradiated from the first lamp and the second lamp, the light shielding region of the variable shade means provided in each lamp By controlling the width, the light shielding region is formed in accordance with the vehicle position ahead detected by the vehicle position detecting means. By doing so, it is possible to minimize the light shielding area without giving glare to the driver of the vehicle ahead. Therefore, the visibility of the road surface ahead of the vehicle is ensured.
The “light distribution pattern” refers to an image by irradiation light projected onto a virtual vertical screen in front of the light source. Therefore, the “pattern” is not a pattern woven by a plurality of objects, but may be an image of a single color by irradiation light.

  The control means may control the first variable shade means and the second variable shade means so that a light shielding region corresponding to the number of vehicles detected by the vehicle position detection means is formed in the entire light distribution pattern. According to this, even when a plurality of vehicles are traveling ahead, it is possible to minimize the light-shielding area without giving glare to the driver of the preceding vehicle.

  The first variable shade means and the second variable shade means may be movable shades that can move in the direction across the optical axis in the first lamp or the second lamp, respectively. According to this, it is possible to change the light shielding region finely following the vehicle position.

  The first variable shade means and the second variable shade means may be a switchable shade that can be used by switching a plurality of shades having different widths of the light shielding area. According to this, since the mechanism for moving the variable shade in the direction crossing the optical axis is not required as described above, a relatively simple configuration can be achieved.

  The first lamp and the second lamp may further include a low beam forming shade that shields part of light emitted from the light source to form a low beam light distribution pattern. In addition to the variable shade, each lamp has a shade for forming a low beam, so that one lamp can irradiate both the low beam distribution pattern and the light distribution pattern with variable light-shielding area, reducing the number of parts. it can.

  According to the present invention, since the light distribution pattern having the light shielding area matched with the vehicle position ahead detected by the vehicle position detecting means is formed, the road surface visibility can be ensured by minimizing the light shielding area. .

  FIG. 1 is a schematic vertical sectional view of a vehicle headlamp device 10 according to an embodiment of the present invention. The vehicular headlamp device 10 includes a left lamp provided on the left side of the front end of the vehicle body and a right lamp provided on the right side. FIG. 1 illustrates a left lamp 30L. Hereinafter, the left lamp will be described, but the right lamp basically has the same configuration.

  The vehicular headlamp apparatus 10 has a configuration in which a left lamp 30L is accommodated in a lamp chamber formed by a lamp body 12 and a translucent cover 14 attached to a front end opening of the lamp body 12. . The left lamp 30L is attached to the lamp body 12 by a support member (not shown).

  The left lamp 30L is a lamp called a projector type, and includes a bulb 86, a reflector 84, a projection lens 22, a low beam forming shade 24, and a high beam forming shade 26, which are light sources. The left lamp 30L is disposed in front of the lamp by reflecting the light emitted from the bulb 86 to the reflector 84 and shielding a part of the light traveling forward from the reflector 84 with the low beam forming shade 24 or the high beam forming shade 26. A light distribution pattern having a cut-off line is projected onto the virtual vertical screen.

  The reflector 84 has a substantially elliptical spherical reflecting surface with the optical axis Ax extending in the vehicle longitudinal direction as the central axis. The reflecting surface is set so that the cross-sectional shape including the optical axis Ax is an ellipse, and the eccentricity gradually increases from the vertical cross section toward the horizontal cross section. The bulb 86 is disposed at the first focal point of the ellipse that constitutes the vertical cross section of the reflecting surface, so that the light from the light source converges on the second focal point of the ellipse.

  The projection lens 22 is a plano-convex aspheric lens having a convex front surface and a flat rear surface, and is disposed on the optical axis Ax. The projection lens 22 is arranged so that the rear focal point coincides with the second focal point of the reflecting surface of the reflector 84, and is configured to project an image on the rear focal plane as an inverted image on the vertical virtual screen. ing. The periphery of the projection lens 22 is held in the front end annular groove of the holder 36.

  As the light source of the lamp, for example, an incandescent bulb, a halogen lamp, a discharge bulb, an LED, a neon tube, a laser light source, and the like can be used. However, in this embodiment, a bulb 86 composed of a halogen lamp is shown as an example. Yes. The bulb 86 is fitted and fixed to an opening formed in the approximate center of the reflector 84 and is supported by the lamp body 12.

  The vehicle headlamp device 10 includes a low beam forming shade 24 or a high beam forming shade 26 that can be individually driven, so that both a low beam light distribution pattern and a high beam light distribution pattern can be created. It is a type headlamp. The low beam forming shade 24 is connected to a low shade drive motor 34L and a gear mechanism (not shown). By operating the low shade drive motor 34L, the low beam forming shade 24 can be tilted forward or returned to the upright position, as indicated by an arrow 25 in the figure.

  The high beam forming shade 26 is connected to a high shade drive motor 32 </ b> L by a substantially L-shaped arm 37. The upper end of the arm 37 is fixed to the lower end of the high beam forming shade 26, and the lower end of the arm 37 is attached to the output shaft of the high shade drive motor 32L. When the high shade drive motor 32L operates and rotates as indicated by an arrow 35 in the drawing, the high beam forming shade 26 can turn around the output axis and move in a direction crossing the optical axis Ax. This movement will be further described with reference to FIGS.

  FIG. 2 is a conceptual diagram when the low beam forming shade 24 and the high beam forming shade 26 are observed from the direction of the arrow B shown in FIG. As shown in FIG. 2, the low beam forming shade 24 has a right side portion extending horizontally below a horizontal line crossing the optical axis on the right side in the vehicle width direction so that a so-called cut-off line is formed in the low beam light distribution pattern. And a left side portion extending horizontally at a position slightly above the right side portion on the left side in the vehicle width direction has a shape connected by a central portion inclined upward to the left. The inclination angle of the central portion is, for example, 45 °.

  The high beam forming shade 26 is disposed on the back surface of the low beam forming shade 24, that is, on the light source side. As shown in FIG. 3, the high beam forming shade 26 is disposed below the horizontal line crossing the optical axis and has a substantially rectangular shape. The vertical portion 26a of the shade 26 forms a vertical cut-off line in the high beam light distribution pattern.

  FIGS. 3A and 3B show a state in which the low beam forming shade 24 is tilted toward the near side with respect to the paper surface by the low shade drive motor 34L. By tilting the low beam forming shade 24, a space through which the light beam reflected by the reflector 84 can pass is created below the horizontal line of the optical axis, and a high beam light distribution pattern can be irradiated.

  The high beam forming shade 26 is movable in a direction crossing the optical axis Ax. As shown in FIG. 3A, in the initial state, the shade 26 is arranged so that the vertical portion 26a is located on the right side of the center line of the reflector 84. However, as shown in FIG. The portion 26 a is configured to be movable to a position on the left side of the center line of the reflector 84. It is preferable that the vertical portion 26a of the high beam forming shade 26 is continuously movable from the left end to the right end of the reflector 84 in a direction crossing the optical axis Ax.

  Note that the low beam forming shade 24 and the high beam forming shade 26 provided in the right lamp 30R are symmetrical to those of the left lamp 30L. That is, the high beam forming shade 26 provided in the right lamp 30R is arranged so that the vertical portion 26a is located on the left side of the center line of the reflector 84 in the initial state.

4A to 4C show high beam light distribution patterns formed on a virtual vertical screen arranged at a predetermined position in front of the lamp, for example, at a position 25 m ahead of the lamp.
FIG. 4A shows a right light distribution pattern RP formed by the right lamp 30R. The right light distribution pattern RP has a shape in which the second quadrant portion of the ellipse is cut out as a whole. The region above the HH line is slightly smaller than the region below the HH line. The three curves in the figure show the difference in illuminance, and the illuminance is higher at the center.

  The vertical line in the drawing represents the cut-off line RC formed in the right side light distribution pattern RP. As shown in FIG. 1, since the projection lens 22 composed of a plano-convex aspherical lens is disposed in front of each high beam forming shade 26 shade, the projected image formed by the high beam irradiation area is displayed on the virtual vertical screen. Note that it is upside down.

  The cut-off line RC can be moved in the horizontal direction across the optical axis Ax as indicated by an arrow in the figure. The cut-off line RC is located on the right side of the VV line in the initial state. The moving range of the cut-off line RC is determined by the movable range of the high beam forming shade 26. In FIG. 4A, it is drawn so as to move only in the first quadrant, but it is preferable that the cut-off line RC can be moved over the major part of the elliptical long axis.

  FIG. 4B shows a left light distribution pattern LP formed by the left lamp 30L. Similarly to the right side light distribution pattern RP, the left side light distribution pattern LP also has a first quadrant portion cut out as a whole, and the region above the HH line is lower than the region below the HH line. The shape is slightly smaller. The vertical cut-off line LC is positioned on the left side of the VV line in the initial state. Other configurations are the same as the cut-off line RC.

  FIG. 4C shows an overall light distribution pattern in which the right light distribution pattern RP and the left light distribution pattern LP are superimposed. The right side light distribution pattern RP and the left side light distribution pattern LP are configured to form an ellipse having the same size. Therefore, in the whole light distribution pattern in which both are superimposed, the illuminance below the HH line is twice as high as that of the single light, and the illuminance above the HH line is the same as that of the single light distribution. In accordance with the positions of the cut-off lines RC and LC of the respective light distribution patterns, a concave light shielding region S is formed above the HH line of the entire light distribution pattern. By changing the position of the cut-off line, the concave light-shielding region can be moved in the horizontal direction along the long axis of the ellipse. This will be described in detail later with reference to FIG.

  FIG. 5 is a functional block diagram showing the overall configuration of the vehicle headlamp device 10. Each block shown here can be realized in hardware by an element such as a computer CPU or memory, a mechanical device, and an electric circuit, and in software by a computer program or the like. It is drawn as a functional block realized by the cooperation. Therefore, those skilled in the art will understand that these functional blocks can be realized in various forms by a combination of hardware and software.

The headlamp device control unit 40 controls the lighting of the left lamp 30L and the right lamp 30R and the operation of each shade provided in the lamp. The headlamp device controller 40 issues a command to the power supply circuit 42 according to the operation of a headlamp switch (not shown) by the driver, and turns on or turns off the left lamp 30L and the right lamp 30R.
When the driver instructs the low beam with the headlamp switch, the shade driving unit 44 is instructed to move the low beam forming shade 24 to the upright position. The shade driving unit 44 includes the low shade driving motor 34L and the low shade driving motor 34L. Activate 34R. Thereby, irradiation is performed with the light distribution pattern for low beam. When the driver instructs the high beam, the shade driving unit 44 is instructed to incline the low beam forming shade 24, and the shade driving unit 44 operates the low shade driving motors 34L and 34R. As a result, the low beam forming shade 24 is tilted forward, and irradiation is performed with the high beam light distribution pattern.

  The cut-off line change unit 50 includes a vehicle position detection unit 52, a cut-off line position determination unit 54, and a shade movement amount instruction unit 56.

  The vehicle position detection unit 52 detects a position occupied by the preceding vehicle in the light distribution pattern based on an image acquired by a CCD (Charge Coupled Device) camera 90 installed in the vehicle so as to capture the front of the vehicle. Specifically, the vehicle position detection unit 52 detects a portion corresponding to the headlight or taillight of the vehicle in an image ahead of the vehicle acquired by the camera 90 according to a known algorithm, and distributes the light distribution pattern. The vehicle position is determined in light of the HH and VV lines. The vehicle position data is output to the cut-off line position determination unit 54. Since a technique for detecting a preceding vehicle from the captured image of such a camera is well known, detailed description is omitted here. Instead of the camera 90, the position of the preceding vehicle may be detected using other detection means such as a millimeter wave radar or an infrared radar.

  The cut-off line position determining unit 54 and the left side light distribution pattern RP are arranged on the left side so that a light-shielding region is formed in accordance with the vehicle position detected by the vehicle position detecting unit 52 when a high beam is instructed by the driver. The horizontal position of each cut-off line RC, LC in the light distribution pattern LP is determined. In other words, the cut-off line position is determined so that an appropriate light-shielding region that does not give glare to the preceding vehicle is formed in the entire light distribution pattern in which the right light distribution pattern RP and the left light distribution pattern LP are combined. . The cut-off line is preferably arranged so that the intersection of the cut-off line and the HH line is slightly outside the detected both ends of the preceding vehicle.

The shade movement amount instruction unit 56 is connected to the right lamp 30R and the left side so that the cut-off lines RC and LC of the right side light distribution pattern RP and the left side light distribution pattern LP are at the horizontal position determined by the cut-off line position determining unit 54. The movement amount of the high beam forming shade 26 in the lamp 30L is calculated, and an instruction is given to the shade driving unit 44.
The shade drive unit 44 sends a drive signal to the high shade drive motors 32L and 32R so that the movement amount instructed by the shade movement amount instruction unit 56 is realized.

  FIG. 6 is a flowchart showing a flow of light shielding control according to the vehicle position in the present embodiment. The camera 90 mounted on the vehicle takes an image in front of the vehicle (S10). The vehicle position detector 52 detects the position occupied by the preceding vehicle in the high beam light distribution pattern based on the captured image (S12). The cut-off line position determination unit 54 determines the cut-off line positions in the right light distribution pattern RP and the left light distribution pattern LP so that an overall light distribution pattern with the vehicle portion as a light shielding region is formed based on the detected vehicle position. Determine (S14). The shade movement amount instruction unit 56 determines the movement amount of the high beam forming shade 26 in the left lamp 30L and the right lamp 30R according to the determined cut-off line position (S16). The shade drive unit 44 transmits a control signal corresponding to the shade movement amount to the high shade drive motors 32R and 32L (S18).

  The operation of the present embodiment having the above configuration is as follows. When a preceding vehicle is detected, a high beam is generated in the left and right lamps so that a right light distribution pattern with a cut-off line located at the right end of the vehicle position and a left light distribution pattern with a cut-off line located at the left end of the vehicle are formed. Move the forming shade. By irradiating the entire light distribution pattern in which the left and right light distribution patterns thus created are superimposed, it is possible to achieve a light distribution that does not give glare to the driver of the preceding vehicle.

  Next, the shape of the light shielding area in the light distribution pattern corresponding to the vehicle position of the preceding vehicle will be described with reference to FIGS.

  FIG. 7 shows a state in which the preceding vehicle 70 is observed while the host vehicle is traveling on the straight road 72. The cut-off line position determination unit 54 determines the position of the cut-off line RC of the right side light distribution pattern so that the intersection with the HH line comes to the right end of the preceding vehicle 70, and HH at the left end of the preceding vehicle 70. The position of the cut-off line LC of the left light distribution pattern LP is determined so that the intersection with the line comes.

  FIG. 8 shows the overall light distribution pattern in which the right side light distribution pattern RP having the cutoff line determined by the position determination unit 54 and the left side light distribution pattern LP are superimposed. As shown in the drawing, a concave light shielding region S formed by the cut-off lines RC and LC is formed in the entire light distribution pattern in accordance with the position of the preceding vehicle 70. As a result, the road surface is irradiated with a light distribution pattern that does not give glare to the driver of the preceding vehicle 70 and minimizes the light shielding area.

  FIG. 9 shows a state in which the preceding vehicle 70 is observed while the host vehicle is traveling on the curved road 76. In this figure, unlike the case of FIG. 7, the forward traveling vehicle 70 is located on the left side away from the VV line. Even in such a case, the light shielding region can be moved in accordance with the vehicle position.

  The cut-off line position determination unit 54 arranges the intersection of the cut-off line RC and the H-H line according to the right end of the preceding vehicle 70, and also sets the cut-off line LC and the H-H line according to the left end of the preceding vehicle 70. Place the intersection with.

  FIG. 10 shows the overall light distribution pattern in which the right side light distribution pattern RP having the cutoff line determined by the position determination unit 54 and the left side light distribution pattern LP are superimposed. As shown in the drawing, even when the horizontal position of the preceding vehicle is shifted to the left, it is possible to form the entire light distribution pattern having the minimum light-shielding region S that matches the vehicle position.

  FIG. 11 shows a state in which the preceding vehicle 70a and the oncoming vehicle 70b are observed while the host vehicle is traveling on the curved road 78. When a plurality of vehicles are captured in the photographed image as in this time, the cut-off line position determining unit 54 arranges the intersection of the cut-off line RC and the HH line according to the right end of the rightmost vehicle. At the same time, the intersection of the cut-off line LC and the HH line is arranged in accordance with the left end of the leftmost vehicle.

  FIG. 12 shows an overall light distribution pattern in which the right side light distribution pattern RP having the cutoff line determined by the position determination unit 54 and the left side light distribution pattern LP are superimposed. As shown in the figure, when there are a plurality of preceding vehicles, the light shielding region S has a horizontally long rectangular shape. However, even at this time, it is possible to irradiate the road surface with a light distribution pattern that does not give glare to any driver of the preceding vehicle and minimizes the light shielding area.

  As described above, according to the present embodiment, in the headlamp device that creates a light distribution pattern for a high beam by superimposing the right light distribution pattern and the left light distribution pattern, the high beam in the right lamp and the left lamp. By driving the forming shade, the cut-off line position can be moved in the horizontal direction within the light distribution pattern. Accordingly, the light shielding region can be freely moved in the horizontal direction by a combination of the left and right cut-off lines. Therefore, an overall light distribution pattern in which only the front vehicle position is the light shielding region can be created. If the shade is configured so that it can move continuously, the cut-off line position also moves continuously within the light distribution pattern, so depending on the horizontal position and size of the preceding vehicle, and the number of vehicles Can be set optimally. Therefore, the illuminance on the road surface can be ensured with the light shielding range being minimized without giving glare to the driver of the preceding vehicle.

When the cut-off line is moved within the high beam light distribution pattern to form the light shielding region as in the present embodiment, there are the following advantages. That is, when switching from the high beam to the low beam so as not to give glare to the preceding vehicle, it becomes impossible to irradiate both sides of the preceding vehicle, resulting in a decrease in forward visibility. Then, forward visibility is hardly impaired.
In addition, if the lamp is swiveled so as to avoid the preceding vehicle, the light-shielding area will become larger than necessary, or both sides of the road will be unnecessarily illuminated in a wide range, and the vehicle will run on the left and right sides. There is a possibility of glare on vehicles and pedestrians. On the other hand, in this embodiment, since the direction of the light beam emitted from the lamp is unchanged, there is no such fear.
Further, when the lamp is swiveled, the light distribution on the road surface changes greatly, which may cause trouble for the driver. However, in this embodiment, at least H− regardless of the presence or position of the preceding vehicle. Since the illuminance does not change in the region below the H line, the light can be controlled with a natural feeling.

  The present invention has been described based on some embodiments. These embodiments are merely examples, and modifications such as any combination of the embodiments, each component of the embodiment, and any combination of each processing process are also within the scope of the present invention. It will be understood by those skilled in the art.

  The present invention is not limited to the above-described embodiments, and various modifications such as design changes can be added based on the knowledge of those skilled in the art. The configuration shown in each drawing is for explaining an example, and can be appropriately changed as long as the configuration can achieve the same function.

  For example, the lamp 30 in each embodiment is a so-called reflection type, but the lamp 30 may be a direct-light type in which the projection lens 22 is directly irradiated with light from the bulb 86.

  The cut-off line formed in the right light distribution pattern and the left light distribution pattern may be a curved line or an inclined line. Thereby, a U-shaped or V-shaped light shielding region can be formed in the entire light distribution pattern.

  In the embodiment, it has been described that the right lamp forms the right light distribution pattern and the left lamp forms the left light distribution pattern, but this relationship may be reversed. That is, the right lamp may form the left light distribution pattern, and the left lamp may form the right light distribution pattern.

  In the embodiment, the right lamp and the left lamp are described as being switchable between the low beam and the high beam, but these lamps may be dedicated to the high beam. That is, a configuration in which only the high beam forming shade is provided in the lamp may be employed.

  In the embodiment, it has been described that the cut-off line in the light distribution pattern is moved by driving the high beam forming shade in a direction crossing the optical axis. However, instead of this configuration, a so-called rotary shade in which a plurality of high beam forming shades, each having a different shielding area, are attached to the circumferential side surface of the rotating shaft with a space therebetween is provided in the lamp, and the shaft is rotated to either one of them. The cut-off line in the light distribution pattern may be moved by adjusting the shade to the focus of the reflector.

  Moreover, you may use the lamp | ramp which has the structure which can move the shade for high beam formation which concerns on embodiment in combination with a well-known swivel mechanism. Thereby, the irradiation control according to the curve of the vehicle can be performed while preventing glare to the driver of the preceding vehicle.

1 is a schematic vertical sectional view of a vehicle headlamp device according to an embodiment of the present invention. It is a conceptual diagram when the shade for low beam formation and the shade for high beam formation are observed from the arrow B shown in FIG. (A), (b) is a figure which shows a mode when the shade for low beam formation inclines to the near side with respect to the paper surface. (A)-(c) is a figure which shows the light distribution pattern for high beams formed on the virtual vertical screen ahead of a lamp. It is a functional block diagram which shows the whole structure of the vehicle headlamp apparatus. It is a flowchart which shows the flow of the light-shielding control according to a vehicle position. It is a figure which shows a mode that the preceding vehicle was observed while the own vehicle drive | worked the straight road. It is a figure which shows a mode when the right side light distribution pattern shown in FIG. 7 and the left side light distribution pattern are irradiated. It is a figure which shows a mode that the front vehicle was observed while the own vehicle drive | worked the curved road. It is a figure which shows a mode when the right side light distribution pattern shown in FIG. 9 and the left side light distribution pattern are irradiated. It is a figure which shows a mode that the preceding vehicle and the oncoming vehicle were observed while the own vehicle drive | worked the curved road. It is a figure which shows a mode when the right side light distribution pattern shown in FIG. 11 and the left side light distribution pattern are irradiated.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 Headlamp apparatus for vehicles, 12 Lamp body, 14 Translucent cover, 22 Projection lens, 24 Shade for low beam formation, 26 Shade for high beam formation, 30L Left lamp, 30R Right lamp, 32 High shade drive motor, 34 Low shade Drive motor, 36 holder, 40 headlight device control unit, 42 power supply circuit, 44 shade drive unit, 50 cut-off line change unit, 52 vehicle position detection unit, 54 cut-off line position determination unit, 56 shade movement amount indication unit, 70 Forward vehicle, 84 reflector, 86 bulb, 90 camera, Ax optical axis, RC right cutoff line, LC left cutoff line, RP right side light distribution pattern, LP left side light distribution pattern.

Claims (1)

  1. A first lamp and a second lamp that irradiate a region including the upper part from the cut-off line of the low beam light distribution pattern;
    A part of the light emitted from the light source of the first lamp is shielded, and is provided in the first lamp so as to form a first light distribution pattern having a light-shielding region above the horizontal line and at least on the left side of the vertical line, A first variable shade means configured to be movable in a direction across the optical axis in the first lamp to change the width of the light shielding region;
    A part of the light emitted from the light source of the second lamp is shielded, and is provided in the second lamp so as to form a second light distribution pattern having a light-shielding region on the upper side of the horizontal line and at least on the right side of the vertical line, A second variable shade means configured to be able to change the width of the light shielding region by moving in a direction across the optical axis in the second lamp ;
    A first low beam forming shade provided in the first lamp so as to shield a part of the light emitted from the light source of the first lamp and form a light distribution pattern for low beam;
    A second low beam forming shade provided in the second lamp so as to shield a part of the light emitted from the light source of the second lamp and form a light distribution pattern for low beam;
    Vehicle position detection means for detecting the vehicle position ahead;
    A light shielding area corresponding to the number of vehicles detected by the vehicle position detecting means is formed in the overall light distribution pattern, in which the overall light distribution pattern obtained by superimposing the first light distribution pattern and the second light distribution pattern is formed in the overall light distribution pattern. to so that a control means for controlling the width of the light shielding region of the first variable shade means the second variable shade means,
    A vehicle headlamp device comprising:
JP2008074442A 2008-03-21 2008-03-21 Vehicle headlamp device Expired - Fee Related JP5260098B2 (en)

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