Vehicle lamp and vehicle system
阅读说明:本技术 车辆用灯具及车辆系统 (Vehicle lamp and vehicle system ) 是由 小泽一嘉 于 2019-07-08 设计创作,主要内容包括:本发明提供将用于对规定区域进行照明的可见发光部和用于对与该区域不同的区域中所存在的对象进行检测的红外发光部形成为一体的、小型并且低成本的车辆用灯具、以及包含该车辆用灯具的车辆系统。该车辆用灯具具备:射出可见光的可见发光部(21);以及用从可见发光部(21)射出的可见光进行规定区域的照明的光学系统(23),该车辆用灯具进一步具备射出红外光的红外发光部(22),光学系统(23)具备反射件(24)(副反射件(242)),该反射件将从可见发光部(21)射出的可见光朝向规定区域反射,并使从红外发光部(22)射出的红外光朝向包含与该规定区域不同的区域在内的区域透过。(The invention provides a small-sized and low-cost vehicle lamp in which a visible light emitting section for illuminating a predetermined area and an infrared light emitting section for detecting an object existing in an area different from the area are formed integrally, and a vehicle system including the vehicle lamp. The vehicle lamp includes: a visible light emitting unit (21) that emits visible light; and an optical system (23) for illuminating a predetermined region with visible light emitted from the visible light emitting section (21), wherein the vehicle lamp further comprises an infrared light emitting section (22) for emitting infrared light, and the optical system (23) comprises a reflecting member (24) (sub-reflecting member (242)) for reflecting the visible light emitted from the visible light emitting section (21) toward the predetermined region and transmitting the infrared light emitted from the infrared light emitting section (22) toward a region including a region different from the predetermined region.)
1. A vehicle lamp includes: a visible light emitting unit that emits visible light; and an optical system for illuminating a predetermined area with the visible light emitted from the visible light emitting portion,
the vehicle lamp further includes an infrared light emitting portion that emits infrared light, and the optical system includes a reflecting member that reflects visible light emitted from the visible light emitting portion toward the predetermined region and transmits infrared light emitted from the infrared light emitting portion toward a region including a region different from the predetermined region.
2. The vehicle lamp according to claim 1, wherein a visible light source of the visible light emitting portion is disposed at a front position of the reflector, an infrared light source of the infrared light emitting portion is disposed at a rear position of the reflector, the visible light is reflected on a front surface of the reflector, and the infrared light is transmitted through the reflector from a rear side toward a front side.
3. The vehicular lamp according to claim 2, wherein the reflector is configured to include: a primary reflector that reflects the visible light; and a sub-reflector that reflects the visible light and transmits the infrared light.
4. A vehicle lamp according to claim 3, wherein the main reflector and the sub reflector are integrally formed, a front surface of the main reflector is configured as a light reflecting surface, and the sub reflector is configured by a member that transmits at least infrared light, and an infrared transmitting filter that reflects visible light and transmits infrared light is provided on a surface of the sub reflector.
5. The vehicular lamp according to claim 4, wherein the infrared transmission filter is constituted by a dielectric multilayer film.
6. The vehicle lamp according to any one of claims 1 to 5, wherein the predetermined region is a low beam light distribution region having a cutoff line at an upper edge, and the region different from the predetermined region is a region above the cutoff line.
7. The vehicle lamp according to claim 6, wherein the optical system includes a light blocking member for blocking a part of the visible light to form the low beam light distribution, and the light blocking member transmits infrared light transmitted through the reflector.
8. The vehicular lamp according to any one of claims 1 to 5, wherein the reflector is formed in a dome shape made up of a part of a rotational ellipse.
9. The vehicle lamp according to claim 7, wherein the shade is formed of a plate-shaped light-transmitting member having an inverted trapezoidal cross section.
10. A vehicle system characterized by being provided with the vehicle lamp according to any one of claims 1 to 9, and an object detection device that detects a first object illuminated with the visible light and a second object illuminated with the infrared light.
Technical Field
The present invention relates to a vehicle lamp capable of emitting infrared light for detecting an object such as another vehicle or a pedestrian, and a vehicle system including the vehicle lamp.
Background
In order to improve the traveling safety of vehicles such as automobiles, there has been proposed a technique of detecting objects such as a preceding vehicle, an oncoming vehicle, and a pedestrian existing in a front area of an automobile by using infrared light. For example, in a headlamp that performs ADB (adaptive driving Beam) light distribution control of a vehicle, the following light distribution control is performed: an object existing in a region other than the illumination region of the low beam light distribution, particularly in a region above the cutoff line of the low beam light distribution, is detected, and the region in which the detected object is present is selectively not illuminated.
Patent document 1 describes the following technique: the apparatus includes an infrared light emitting unit that irradiates infrared light onto a region to be controlled for ADB light distribution (hereinafter referred to as an ADB control region), and detects an object based on the infrared light reflected from the object existing in the ADB control region. The infrared light emitting unit for irradiating infrared light is configured as follows: the ADB control area is divided into a plurality of areas, and a plurality of infrared light emitting elements for irradiating infrared light to each divided area are provided.
Disclosure of Invention
Problems to be solved by the invention
Since the infrared light emitting part and the ADB light emitting part are integrally configured in the technique of reference 1, the technique of reference 1 is not preferable in terms of using the infrared light emitting part for applications other than ADB light emission control. For example, in recent years, an automatic driving technique has been proposed which requires an object detection means using infrared light, but when the technique of reference 1 is used as the detection means, an ADB light emitting section is not required, and therefore, the lamp becomes large in size and the cost becomes high.
The invention aims to provide a small-sized and low-cost vehicle lamp and a vehicle system including the vehicle lamp by integrating a visible light emitting part for illuminating a predetermined area and an infrared light emitting part capable of detecting an object existing in an area different from the area.
Means for solving the problems
The vehicle lamp of the present invention includes: a visible light emitting unit that emits visible light; and an optical system for illuminating a predetermined region with visible light emitted from the visible light emitting portion, wherein the vehicle lamp further includes an infrared light emitting portion for emitting infrared light, and the optical system includes a reflecting member for reflecting the visible light emitted from the visible light emitting portion toward the predetermined region and transmitting the infrared light emitted from the infrared light emitting portion toward a region including a region different from the predetermined region. Further, a visible light source of the visible light emitting portion is disposed at a position on the front side of the reflector, an infrared light source of the infrared light emitting portion is disposed at a position on the rear side of the reflector, the visible light is reflected on the front surface of the reflector, and the infrared light is transmitted through the reflector from the rear side toward the front side.
In a preferred embodiment of the present invention, the reflector includes: a main reflector that reflects visible light; and a sub-reflector that reflects visible light and transmits infrared light. In this case, for example, the main reflector and the sub reflector are integrally formed, the front surface of the main reflector is configured as a light reflecting surface, and the sub reflector is configured by a member that transmits at least infrared light, and an infrared transmitting filter that reflects visible light and transmits infrared light is provided on the surface of the sub reflector. Further, the infrared transmission filter is composed of a dielectric multilayer film.
In the present invention, for example, the predetermined region is a low beam light distribution region having a cutoff line at an upper edge, and the region different from the predetermined region is a region above the cutoff line. In the present invention, the optical system includes a light blocking member for blocking a part of visible light to form low beam light distribution, and the light blocking member is configured to transmit infrared light transmitted through the reflecting member. In the present invention, the reflector is formed in a dome shape made of a part of a rotational ellipse. In the present invention, the light blocking member is formed of a plate-shaped light transmissive member having an inverted trapezoidal cross section.
The vehicle system of the present invention further includes an object detection device that detects a first object illuminated with the visible light and a second object illuminated with the infrared light.
Effects of the invention
According to the present invention, since the visible light is reflected by the reflector included in the optical system to illuminate the predetermined region and the infrared light is transmitted to illuminate the region including the region different from the predetermined region, the object existing in the illuminated predetermined region and the object existing in the region different from the illuminated predetermined region can be detected separately. Thus, the vehicle lamp and the vehicle system including the vehicle lamp can be downsized and reduced in cost.
Drawings
Fig. 1 is a schematic horizontal cross-sectional view of a headlamp of a motor vehicle to which the present invention is applied.
Fig. 2 is a light distribution characteristic diagram of low beam light distribution and high beam light distribution.
Fig. 3 is a longitudinal sectional view of the low beam lamp unit.
Fig. 4 is an enlarged longitudinal sectional view of main components of the low beam lamp unit.
Fig. 5 is a schematic perspective view of main components of the low beam lamp unit.
Fig. 6 is a light distribution characteristic diagram of an irradiation region of infrared light.
Fig. 7 is a light distribution characteristic diagram for explaining ADB light distribution control.
Fig. 8 is a schematic perspective view of a modification of the scanning mirror in the ADB light distribution control.
Description of the reference numerals
1: a lamp housing;
2: a low beam light unit;
3: a high beam unit;
21: a white light emitting portion (visible light emitting portion);
22: an infrared light emitting section;
24: a reflector;
25: a selective light shield;
26: a projection lens;
31: a white LED;
32: a scanning mirror;
33: a projection lens;
211: white LEDs (visible light sources: white light sources);
221: infrared LEDs (infrared light sources);
241: a primary reflector;
242: a secondary reflector;
244: an infrared transmitting and filtering light part;
252: an infrared transmitting and filtering light part;
PL: a low beam light distribution region (predetermined region);
pH: an ADB control area;
PI: the infrared light illuminates an area.
Detailed Description
Next, embodiments of the present invention will be described with reference to the drawings. Fig. 1 is a schematic horizontal sectional view of a headlamp HL of a motor vehicle to which the present invention is applied. The headlamp HL includes a lamp body 11 and a lamp housing 1 including a
Further, an object detection device 4 is incorporated in the lamp housing 1. The object detection device 4 includes: an image pickup device 41 having sensitivity in a wavelength range from visible light to infrared light, and an
Further, a
The low
The visible
The high beam unit 3 is configured as a lamp unit for ADB light distribution control of a light scanning system. The high beam unit 3 includes: a light source emitting visible light, in this case, a white LED31 emitting white light as visible light; a
When the
The details of the low
The white LED211 has a light emitting surface that faces vertically upward and is disposed on the front side of the lamp with respect to the infrared
The
The
The
The inner surface of the
As shown in fig. 4, the sub-reflector 242 is formed of a light-transmitting
The selective light-shielding
In the headlamp HL configured as described above, when the occupant (driver) operates the lighting switch (not shown) to the "low beam", the low
At this time, since a part of the light reflected by the
When the occupant operates the lighting switch to "high beam", the
On the other hand, when the occupant operates the lighting switch to the "ADB control", the
Further, light emitted from the infrared LED221 that emits light is converted into a desired light flux by the
As a result, as shown in fig. 6, the infrared light is irradiated toward the upper region of the low beam distribution region composed of the white light, that is, toward the ADB control region PH. Here, the irradiation is performed on an area (dot-line area) PI slightly narrower than the ADB control area PH. Since the selective light-shielding
On the other hand, the object detection device 4 images the area in front of the vehicle by the imaging element 41, and detects the object from the image captured by the
When the object is detected, particularly by infrared light, the
The white LED31 continuously emits light for a long time and the light emitted therefrom is reciprocally scanned in the horizontal direction by the
Thus, when the ADB control is performed, as shown in fig. 7, the illumination with white light is restricted in the area where the target exists in the ADB control area PH, and illumination with a desired illuminance is performed with white light in the other areas. In this example, the illuminance is controlled to be substantially zero in a region where the oncoming vehicle CAR is present, and the illuminance is controlled to be reduced in regions where pedestrians M1, M2 are present. Thus, ADB light distribution control is realized which improves visibility in the front area of the automobile without dazzling the subject oncoming vehicle or pedestrian.
In this way, in this embodiment, the white
According to the present invention, a predetermined region is illuminated with visible light, and an area different from the region or an area partially overlapping the region is illuminated with infrared light, whereby an object that cannot be visually recognized with visible light or an object existing in the region that cannot be detected with visible light can be detected with infrared light. This makes it possible to reduce the size of the lamp required for a vehicle and to reduce the cost.
Although the foregoing embodiment has described the example in which ADB control is performed by the infrared light emitting unit, the present invention can detect an object by using infrared light emitted from the infrared light emitting unit, and thus can be applied to safe driving control or automatic driving control of a vehicle.
For example, when the visible light emitting portion of the low beam unit is turned on to illuminate with the low beam light distribution, infrared light is irradiated to a region where the low beam light distribution is not illuminated by turning on the infrared light emitting portion, and an object present in the non-illuminated region is detected by the object detection device, so that all objects present in a region in front of the vehicle, that is, the low beam light distribution region and other regions can be detected.
Therefore, for example, by displaying the object detected by the object detection device on a monitor of an automobile or the like, the driver can check the object existing in a region other than the near-light distribution region with low visibility, and therefore, the present invention is effective for safe driving. In addition, the automatic driving control can be realized by controlling the steering and the vehicle speed of the vehicle based on the detected object.
Alternatively, during daytime running, only the infrared light emitting unit of the low beam lamp unit may be turned on to irradiate a predetermined area with infrared light, and the object detection device may detect an object present in the irradiated area. In particular, it is possible to detect an object existing in a distant area or shadow in front of a motor vehicle that is difficult for a driver to visually recognize, and it is effective for safe driving. In addition, the present invention can also be applied to automatic driving control.
The object of the present invention is not limited to vehicles and pedestrians, and may be a road shape, a lane line, or the like that can be detected by infrared light. In particular, in the case of automatic driving control, it is effective to detect such an object.
The light emitting section in the present invention is not limited to the case where an LED is used as the light source as in the embodiment, and a semiconductor light emitting element such as an LD or an organic LED may be used as the light source, or a light source such as a bulb or a discharge lamp may be used.
The scanning unit in the high beam unit when the present invention is applied to the ADB control is not limited to the rotating reflector described in the embodiment. For example, as shown in fig. 8, a simple structure may be adopted in which light-reflecting
The high beam unit is not limited to a configuration in which light is scanned by a scanning mirror, and may be a lamp unit in which a plurality of light emitting elements are arranged and selectively turned on and off.
In the embodiment, the object detection device 4 is integrally configured with the headlamp HL, but the object detection device may be configured independently of the lamp. That is, the object may be detected by an object detection device provided separately from the lamp by using infrared light emitted by an infrared light emitting unit provided in the lamp.
In the present embodiment, the reflecting member is configured by the main reflecting member and the sub reflecting member, but may be configured as a reflecting member forming a region through which infrared light is transmitted on a part of the reflecting surface without particularly configuring the reflecting member to be different from the sub reflecting member.
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