JP2012006493A - Headlight - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a headlight that improves utilization efficiency of light and improves safety of eyes.SOLUTION: The headlight 2 emits a laser beam having coherence. The headlight 2 includes: a detection unit 20 for detecting a person in a detection area including at least part of areas S1 and S2 where the laser beam emitted from the headlight 2 pass; and a control unit 31 for decreasing or stopping an output of a laser generator 11 when the detection unit 20 detects the person in the detection area.

Description

  The present invention relates to a headlamp, and more particularly, to a headlamp using a laser generator as a light source.

  Conventionally, a headlamp using a laser generator as a light source is known (see, for example, Patent Document 1).

  Patent Document 1 discloses an ultraviolet LD element (laser generator) that functions as a light source, a phosphor that converts laser light emitted from the ultraviolet LD element into visible light, and visible light emitted from the phosphor in a predetermined direction. There is disclosed a light source device (headlamp) including a reflecting mirror for reflecting light.

  Since visible light emitted from the phosphor is emitted in all directions, this light source device is provided with a reflecting mirror that reflects the visible light emitted from the phosphor in a predetermined direction. Thereby, it is possible to suppress to some extent that the light utilization efficiency falls.

  However, the light source device disclosed in Patent Document 1 has a disadvantage that it is difficult to reduce the size of the light source device because it is necessary to provide a reflecting mirror. In addition, when the laser light emitted from the phosphor is reflected using a reflecting mirror, light loss is generated at the time of reflection because the light absorption by the reflecting mirror is not zero. For this reason, there is an inconvenience that it is difficult to sufficiently suppress a decrease in light utilization efficiency.

  Conventionally, a headlamp that can improve the above-described inconvenience is also known (see, for example, Patent Document 2).

  Patent Document 2 discloses a headlamp that includes a semiconductor laser array including a plurality of semiconductor laser elements functioning as a light source and emits laser light.

  This headlamp is configured to emit laser light emitted from the semiconductor laser array forward as it is. In other words, this headlamp is configured to emit laser light emitted from the semiconductor laser array forward in a coherent state without using a phosphor or the like.

  Since the laser light emitted from the semiconductor laser array (semiconductor laser element) travels in a predetermined direction with a predetermined spread angle, the headlamp of Patent Document 2 differs from the light source device of Patent Document 1 in that it emits light. There is no need to provide a reflecting mirror for reflecting in a predetermined direction. For this reason, in the said patent document 2, it is possible to miniaturize a headlamp.

  Moreover, in the headlamp of the said patent document 2, since the loss of light does not generate | occur | produce with a reflecting mirror, it is possible to fully suppress that the utilization efficiency of light falls.

JP 2003-295319 A JP-A-10-125106

  However, in the headlamp disclosed in Patent Document 2, the laser light emitted from the semiconductor laser array is emitted forward in a coherent state, so that the laser light emitted from the headlamp has an adverse effect on human eyes. There is a problem that it may affect.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to improve the light utilization efficiency and improve the safety for the eyes. It is to provide a possible headlamp.

  In order to achieve the above object, a headlamp according to one aspect of the present invention is a headlamp that emits laser light having coherence, and at least a region in which a laser beam emitted from the headlamp passes. An output that lowers or stops the output of the laser generator that functions as a laser light source when a detection unit for detecting a person existing in a detection region including a part and a detection unit detects a person existing in the detection region And an adjustment unit.

  The headlamp according to this aspect emits laser light having coherence as described above. That is, the headlamp according to this aspect is configured to emit laser light emitted from a laser generator functioning as a laser light source without using a phosphor or the like. Since the laser light travels in a predetermined direction with a predetermined spread angle, the headlamp according to this one aspect improves the light utilization efficiency without providing a reflecting mirror for reflecting the light in the predetermined direction. Can be made. Thereby, the utilization efficiency of light can be improved while reducing the size of the entire headlamp. Moreover, since it is not necessary to provide a reflecting mirror, it is possible to suppress the occurrence of light loss in the reflecting mirror. Thereby, the utilization efficiency of light can be improved more.

  Further, since it is not necessary to use a phosphor, it is not necessary to provide a heat radiating member for radiating heat generated in the phosphor. Thereby, compared with the case where fluorescent substance is used, a headlamp can be reduced more in size. In addition, since it is not necessary to use a phosphor, it is possible to prevent light loss from occurring in the phosphor, and it is possible to further improve the light utilization efficiency.

  Further, in the headlamp according to one aspect, as described above, a detection unit for detecting a person existing in a detection region including at least a part of a passage region of the laser light emitted from the headlamp, and detection And an output adjusting unit that lowers or stops the output of the laser generator when the unit detects a person existing in the detection region. Thereby, since it can suppress that the laser beam which has coherence property injects into a human eye with high intensity | strength, it suppresses that the laser beam radiate | emitted from the headlamp has a bad influence on a human eye. be able to.

  In the headlamp according to the above aspect, the detection unit preferably has a function of detecting a distance from the headlamp to the person, and the output adjustment unit is configured such that the distance from the headlamp to the person is a predetermined value or less. If this happens, the output of the laser generator is reduced or stopped. Since the laser light travels at a predetermined spread angle as described above, the intensity of the laser light incident on the human eye increases as the headlight is approached. For this reason, as described above, the detection unit is configured to detect the distance from the headlamp to the person, and when the distance from the headlamp to the person falls below a predetermined value, the output of the laser generator By configuring the output adjusting unit to reduce or stop the light, it is possible to easily suppress the laser light emitted from the headlamp from entering the human eye with high intensity. In addition, when the distance from the headlamp to the person is greater than a predetermined value, the output of the laser light is not reduced or stopped, so that the illumination area can be prevented from becoming dark. Thereby, it can suppress that a visual field worsens (it becomes dark).

  In the headlamp according to the above aspect, preferably, the detection unit has a function of detecting a position where a person exists, and the output adjustment unit outputs the output of the laser generator based on the position where the person exists. Reduce or stop. With this configuration, the laser light emitted from the headlamp can be easily prevented from entering the human eye with high intensity, so that the laser light can easily adversely affect the human eye. Can be suppressed. Moreover, since it can suppress that the output adjustment part reduces (or stops) the output of a laser generator more than necessary, it can suppress that an illumination area | region becomes dark. Thereby, it can suppress that a visual field worsens (it becomes dark).

  In the headlamp according to the above aspect, the output adjusting unit preferably reduces or stops the output of the laser generator based on the wavelength of the laser light emitted from the headlamp. Due to the difference in the wavelength of the laser beam, the intensity of the laser beam that adversely affects the human eye varies. For this reason, as described above, the output adjustment unit is configured to reduce or stop the output of the laser generator based on the wavelength of the laser light emitted from the headlamp, and is emitted from the headlamp. It is possible to easily suppress the laser light from entering the human eye with high intensity. Thereby, it can suppress easily that a laser beam has a bad influence on a human eye.

  The headlamp according to the above aspect preferably further includes a lens that emits laser light emitted from the laser generator from the headlamp at a predetermined spread angle. If comprised in this way, the light distribution pattern by the laser beam radiate | emitted from a headlamp can be easily set to a desired shape.

  In the headlamp provided with the lens, preferably, the lens transmits the laser light from the laser generator with at least a small divergence angle in the vertical direction. If comprised in this way, it can suppress that a headlamp irradiates the area | region above or below the front of a headlamp more than needed.

  In the headlamp including the lens, preferably, the lens transmits the laser light from the laser generator with a horizontal spread angle and a vertical spread angle different from each other. If comprised in this way, the light distribution pattern by the laser beam radiate | emitted from a headlamp can be easily set to a desired shape.

  In the headlamp according to the above aspect, the laser generator may include a plurality of laser generators having different oscillation wavelengths.

  In the headlamp according to the above aspect, the laser light emitted from the headlamp preferably includes green laser light and red laser light. If comprised in this way, visibility can be improved compared with the case where the laser beam radiate | emitted from a headlamp is comprised so that only a red laser beam and a blue laser beam may be included.

  In the headlamp according to the above aspect, the laser generator preferably includes a first laser generator and a second laser generator, and a first passage region through which laser light emitted from the first laser generator passes. When a person exists in the overlapping region where the laser beam emitted from the second laser generator and the second passing region through which the laser beam passes, the output adjusting unit is configured to both the first laser generator and the second laser generator. When the person is present in a region other than the overlapping region in the first passage region and the second passage region, the output adjustment unit is configured to output the first laser generator and the second laser generator. Reduce or stop at least one of the outputs. With this configuration, the laser light emitted from the headlamp can be easily prevented from entering the human eye with high intensity, so that the laser light can easily adversely affect the human eye. Can be suppressed.

  In the headlamp in which the laser generator includes the first laser generator and the second laser generator, preferably, a person is present in a region other than the overlapping region in the first passing region and the second passing region. The output adjusting unit increases or maintains the output of the other of the first laser generator and the second laser generator. If comprised in this way, since it can suppress that an illumination area | region becomes dark, it can suppress that a visual field becomes bad (dark).

  In the headlamp according to the above aspect, the detection unit preferably includes at least one of an infrared sensor, an ultrasonic sensor, a millimeter wave radar, and a visible light camera. If comprised in this way, the person who exists in a detection area | region can be detected easily.

  In the headlamp according to the aforementioned aspect, the laser generator preferably includes a semiconductor laser element. Since the semiconductor laser element is smaller and lighter and consumes less power than laser generators other than the semiconductor laser element, it is particularly effective to configure the laser generator to include the semiconductor laser element. . The semiconductor laser element has a higher output than the LED. For this reason, compared with the case where LED is used as a light source, the number of light sources can be reduced and a light source can be further reduced in size and weight.

  In the headlamp according to the above aspect, preferably, the output adjustment unit has a class 1 intensity determined by the safety standard of the laser product of JIS C 6802, in which the intensity of the laser beam emitted from the headlamp and incident on the human eye is The output of the laser generator is reduced or stopped so that it is below the intensity. If comprised in this way, it can fully suppress that the laser beam radiate | emitted from the headlamp has a bad influence on a human eye.

  As described above, according to the present invention, it is possible to easily obtain a headlamp capable of improving the light utilization efficiency and improving the safety for eyes.

1 is a block diagram showing an overall configuration of an automobile provided with a headlamp according to a first embodiment of the present invention. It is the figure which showed the structure of the irradiation unit of the headlamp by 1st Embodiment of this invention shown in FIG. It is the figure which showed the structure of the green laser beam generator of the headlamp by 1st Embodiment of this invention shown in FIG. It is the side view which showed the laser generator and lens of the headlamp by 1st Embodiment of this invention shown in FIG. It is the top view which showed the laser generator and lens of the headlamp by 1st Embodiment of this invention shown in FIG. It is the figure which showed the illumination area, passage area, etc. of the headlamp by 1st Embodiment of this invention shown in FIG. It is the figure which showed the illumination area, passage area, etc. of the headlamp by 1st Embodiment of this invention shown in FIG. It is the figure which showed the illumination area, passage area, etc. of the headlamp by 1st Embodiment of this invention shown in FIG. It is the figure which showed the structure of the irradiation unit of the headlamp by 2nd Embodiment of this invention. It is the figure which showed the illumination area, passage area, etc. of the headlamp by 2nd Embodiment of this invention shown in FIG. It is the figure which showed the structure of the irradiation unit by the 1st modification of this invention. It is the figure which showed the structure of the irradiation unit by the 2nd modification of this invention. It is the figure which showed the illumination area etc. of the irradiation unit by the 3rd modification of this invention.

  Embodiments of the present invention will be described below with reference to the drawings. In order to facilitate understanding, hatching may be applied even if it is not a cross-sectional view.

(First embodiment)
First, with reference to FIGS. 1-8, the structure of the motor vehicle 1 provided with the headlamp 2 by 1st Embodiment of this invention is demonstrated.

  As shown in FIG. 1, a vehicle 1 according to the first embodiment of the present invention includes a headlamp 2 that irradiates the front in the traveling direction when traveling at night, and a vehicle speed detector 3 that detects the vehicle speed of the vehicle 1. And.

  The vehicle speed detector 3 is configured to detect the vehicle speed of the automobile 1 from, for example, the rotational speed of the front wheels or the rear wheels.

  The headlamp 2 is a headlamp that is electrically connected to the irradiation unit 10 for emitting visible laser light having coherence, a detection unit 20 for detecting a person, and the irradiation unit 10 and the detection unit 20. 2 is provided with a control unit 31 that controls the whole and a memory 32 that is electrically connected to the control unit 31. The control unit 31 is an example of the “output adjustment unit” in the present invention.

  For example, one irradiation unit 10 is provided at each of the left and right front end portions of the automobile 1. As shown in FIG. 2, the irradiation unit 10 includes a plurality of laser generators 11 that function as laser light sources, and a lens 12 provided for each laser generator 11. The irradiation unit 10 (headlight 2) is not provided with a phosphor that diffuses the laser light emitted from the laser generator 11, and the laser light emitted from the irradiation unit 10 (laser generator 11) is , It proceeds in a predetermined direction with a predetermined spread angle. For this reason, the irradiation unit 10 (headlamp 2) is not provided with a reflecting mirror that reflects the laser light in a predetermined direction.

  The plurality of laser generators 11 include a red semiconductor laser element 111 that emits red laser light and a green laser light generator 112 that emits green laser light. The red semiconductor laser element 111 is an example of the “semiconductor laser element” in the present invention.

  The red semiconductor laser element 111 has a function of emitting red laser light having a center wavelength of about 630 nm. The red semiconductor laser element 111 can adopt a conventionally known structure. For example, the red semiconductor laser device 111 includes an n-type GaAs substrate, an n-type AlGaInP clad layer, a multiple quantum well (MQW) active layer, a p-type AlGaInP clad layer, and a p-type GaAs that are sequentially provided on the upper surface of the n-type GaAs substrate. The contact layer and the p-side electrode are formed by the n-side electrode provided on the lower surface of the n-type GaAs substrate.

  The laser beam emitted from the red semiconductor laser element 111 is emitted so as to spread in an elliptical cone shape. Here, since the light distribution pattern required as the headlamp 2 of the automobile 1 is a horizontally long (long in the horizontal direction) pattern, the long axis of the emitted laser light irradiation pattern is substantially horizontal. Thus, it is preferable to arrange the red semiconductor laser element 111.

  The green laser light generator 112 is a DPSS (Diode Pumped Solid State) laser, and as shown in FIG. 3, an infrared semiconductor laser element 112a that emits infrared laser light, a host crystal 112b, and a frequency-multiplied crystal 112c. The infrared semiconductor laser element 112a is an example of the “semiconductor laser element” in the present invention.

  The infrared semiconductor laser element 112a is a GaAs semiconductor laser element, and has a function of emitting infrared laser light having a center wavelength of about 808 nm. The host crystal 112b is made of Nd: YVO4 or the like and has a function of converting the laser light from the infrared semiconductor laser element 112a into infrared laser light having a center wavelength of about 1064 nm. The frequency doubling crystal 112c is formed of SHG (Second Harmonic Generation) crystal such as KTP, and converts the laser light having a center wavelength of about 1064 nm to a half wavelength and converting it to green laser light having a center wavelength of about 532 nm. It has the function to do. As a result, green laser light having a center wavelength of about 532 nm can be emitted from the green laser light generator 112.

  Further, the laser light emitted from the green laser light generator 112 is emitted so as to spread in a true cone shape. Note that the green laser light generator 112 may be configured such that the emitted laser light is a perfect circular parallel light.

  As shown in FIG. 2, the lens 12 includes a lens 121 disposed near the laser light emitting end of the red semiconductor laser element 111 and a lens 122 disposed near the laser light emitting end of the green laser light generating device 112. Including.

  Since the diameter of the laser beam at the laser beam emitting ends of the red semiconductor laser element 111 and the green laser beam generator 112 is very small (for example, smaller than 0.1 mm), the lens 12 (lenses 121 and 122). The diameter is very small. For example, the lens diameter of the lens 12 (lenses 121 and 122) can be about several mm.

  In addition, the lenses 121 and 122 have a light distribution pattern of laser light to be emitted (transmitted), a light distribution pattern of a low-beam headlight, which is defined in detail by law, and a headlight for traveling (high beam). It is formed so as to satisfy the light distribution pattern.

  Specifically, in order to obtain a desired light distribution pattern, when it is necessary to increase the spread angle of the laser light from the laser generator 11 (the red semiconductor laser element 111 and the green laser light generator 112), The lens 12 (lenses 121 and 122) is formed of a concave lens. On the other hand, when it is necessary to reduce the spread angle of the laser light from the laser generator 11, the lens 12 (lenses 121 and 122) is formed by a convex lens. Further, when the divergence angle of the laser beam in the vertical direction is reduced (or increased) and the divergence angle of the laser beam in the horizontal direction is increased (or decreased), the lens 12 becomes a convex lens (or a concave lens) in the vertical direction. It may be formed so as to be a concave lens (or convex lens) in the horizontal direction.

  Further, since the laser light emitted from the green laser light generator 112 spreads in a true cone shape (or is a perfect circular parallel light), in order to obtain a horizontally elongated light distribution pattern, the lens 122 is arranged in the vertical direction. And the horizontal curvature are different from each other. The lens 121 may also be formed such that the vertical curvature and the horizontal curvature are different.

  As shown in FIG. 4, the vertical spread angle of the laser light emitted from the lens 12 is set to θ1 (for example, about 4 degrees). Thus, when the vertical spread angle of the laser light emitted from the lens 12 is set to about 4 degrees, for example, the spread angle of the laser light emitted from the laser generator 11 is about 10 degrees or more, for example. If there is, the lens 12 is formed so as to transmit the laser light from the laser generator 11 with at least a small divergence angle in the vertical direction. In addition, the headlamp 2 irradiates a region above or below the front of the headlamp 2 more than necessary by transmitting the laser light from the laser generator 11 with a reduced vertical spread angle. It is possible to suppress this.

  Further, as shown in FIG. 5, the horizontal spread angle of the laser light emitted from the lens 12 is set to θ2 (for example, about 12 degrees).

  The spread angle of the laser light emitted from the lens 12 is equal to the spread angle of the light emitted from the irradiation unit 10.

  Here, the reason why the plurality of laser generators 11 are constituted by the red semiconductor laser element 111 and the green laser light generator 112 will be described.

  Road signs (traffic signs) are mainly guide signs displayed in green or blue, warning signs displayed in yellow or black, regulatory signs displayed in red or blue, indication signs displayed mainly in blue , There is an auxiliary sign displayed mainly in black.

  Of these, there are many regulatory signs that are important in the Road Traffic Law, such as traffic closure, entry prohibition, maximum speed and parking prohibition. For this reason, it is thought that it is preferable that red light and blue light are contained in the light emitted from the headlamp 2 so that red and blue used for the regulation sign can be correctly visually recognized. That is, when the headlamp 2 (laser generator 11) is configured to emit two kinds of light, the laser generator 11 (red semiconductor laser element 111) that emits red light and the blue light are emitted. It is considered that it is preferable to configure the laser generator 11 (such as a blue semiconductor laser element) that emits light.

  However, according to an experiment conducted by the inventors of the present application, the light emitted from the headlamp 2 is more visually recognized when red light and green light are included than when red light and blue light are included. It has been found that it is possible to improve the performance.

  Specifically, when red light and green light are included in the light emitted from the headlamp 2, in addition to good visibility of red and green, it is possible to sufficiently recognize blue. there were. Furthermore, it was possible to fully recognize yellow as well. Thus, by including red light and green light in the light emitted from the headlamp 2, the number (type) of colors that can be visually recognized can be increased. For this reason, in the first embodiment, a plurality (two) of laser generators 11 are configured by the red semiconductor laser element 111 and the green laser light generator 112.

  For example, one detection unit 20 (see FIG. 1) is provided at each of the left and right front end portions of the automobile 1. The detection unit 20 has a function of detecting a person existing in a predetermined area (a detection area described later) in front of the automobile 1. In addition, this predetermined area | region (detection area | region mentioned later) is an area | region including a part of passage areas S1 and S2 (refer FIG. 6) of the light radiate | emitted from the irradiation unit 10 (headlamp 2) so that it may mention later. is there. As shown in FIG. 1, the detection unit 20 includes a human sensor 21 for detecting a person and an analysis unit 22 connected to the human sensor 21 and the control unit 31.

  The human sensor 21 may be arranged inside the irradiation unit 10 as shown in FIG. In addition, the human sensor 21 may be arrange | positioned around the irradiation unit 10, and may be arrange | positioned around the motor vehicle 1, for example, the periphery of a room mirror (not shown).

  The human sensor 21 includes a sensor (infrared sensor, visible light camera, ultrasonic sensor, or millimeter wave sensor) that receives (receives) infrared light, visible light, ultrasonic waves, millimeter waves, or the like. When the human sensor 21 is configured by a sensor that receives (receives) near-infrared rays, ultrasonic waves, or millimeter waves, an emission unit (not shown) that emits near-infrared rays, ultrasonic waves, or millimeter waves is provided separately. May be.

  The analysis unit 22 has a function of determining (detecting) whether or not a person is present in a predetermined area (detection area) in front of the automobile 1 by receiving a detection signal from the human sensor 21. Furthermore, in 1st Embodiment, the analysis part 22 is comprised so that the detection signal received from the human sensitive sensor 21 may be analyzed, and the position (direction and distance) where a person (especially head) exists may be detected. .

  In addition, by providing the human sensor 21 and the analysis unit 22, it is possible to easily determine whether or not the object is a person.

  The control unit 31 receives the signal from the analysis unit 22 so that the intensity of the laser beam incident on the human eye always satisfies the class 1 defined by the safety standard (the safety standard of the laser product of JIS C 6802). And has a function of controlling the laser generator 11.

  Specifically, the control unit 31 adjusts the output of the laser light emitted from the laser generator 11 by adjusting the power supplied to the laser generator 11 via a power supply unit (not shown) or the like. Is configured to do.

  Moreover, the control part 31 is comprised so that the output of the laser generator 11 may be reduced or stopped when a person exists in the said predetermined | prescribed area | region (detection area | region mentioned later).

  Specifically, as will be described later, the control unit 31 reduces the output of the laser generator 11 based on the position (direction and distance) where a person exists and the wavelength of the laser light emitted from the headlamp 2. Or it is configured to stop. Further, as will be described later, the control unit 31 is configured to reduce or stop the output of the laser generator 11 when the distance from the headlamp 2 to the person becomes a predetermined value or less.

  The memory 32 stores power data and the like to be supplied to the laser generator 11 set corresponding to the position (direction and distance) where a person exists.

  Next, the light distribution pattern (illuminance standard) of the traveling headlamp (high beam) defined by law will be described.

  In the illuminance standard for a driving headlamp (high beam), as shown in FIG. 6, it is necessary to irradiate a region having a width L2 (= 4.5 m) in the horizontal direction in front of the distance L1 (= 25 m) of the automobile 1. is there. In this illuminance standard, there is no definition of the vertical direction, and here, description will be made assuming that a region having a height H1 (= 1 m) is irradiated in the vertical direction.

  This area (illumination area) includes a central illumination area A1 having a length of 1 m in the horizontal direction, and an illumination area A2 disposed outside the illumination area A1 and having a length of 0.625 m in the horizontal direction. The illumination area A3 is arranged outside the illumination area A2 and is divided into an illumination area A3 having a length of 1.125 m in the horizontal direction.

  The maximum illuminance needs to be 48 lx (lux) or more and 150 lx or less. In addition, the illumination area A1 requires an illuminance of 80% or more of the maximum illuminance. That is, for example, when the maximum illuminance is 48 lx, the illumination area A1 needs an illuminance of 38.4 lx or more, and when the maximum illuminance is 150 lx, the illumination area A1 needs an illuminance of 120 lx or more.

  The illumination area A2 requires illuminance of 24 lx or more, and the illumination area A3 requires illuminance of 6 lx or more.

  Next, the distance from the headlamp 2 to the person that needs to reduce or stop the output of the laser generator 11 will be described.

  First, the case where the laser beam emitted from the laser generator 11 is composed only of green will be described.

Assuming that the entire illumination area A1 has a maximum illuminance of 150 lx, the luminous flux incident on the illumination area A1 is 150 [lx] × 1 [m ² ] = 150 [lm]. Here, the relative luminous sensitivity of light having a wavelength of about 532 nm (green light) to light having a wavelength of 555 nm is about 0.88, and thus the radiant flux of the laser light incident on the illumination area A1 is 150 [lm]. / 683 [lm / W] /0.88=0.250 [W].

If the diameter of the human eye (pupil) is about 7 mm, the area of the human eye (pupil) is 3.85 × 10 ⁻⁵ m ² . The area of the illumination area A1 is 1 m ² . For this reason, the radiant flux of the laser beam incident on the human eye (pupil) in front of 25 m is 0.250 [W] × 3.85 × 10 ⁻⁵ [m ² ] / 1 [m ² ] = 9.63 [ΜW].

  If the safety standard class 1 of the laser product is 0.4 mW and 0.4 mW is divided by 9.63 μW, then 0.4 [mW] /9.63 [μW] = 41.5. That is, it means that the safety standard class 1 is satisfied even when a radiation flux of about 41.5 times is incident on the human eye (pupil) in front of 25 m.

  Here, consider a case where the distance from the headlamp 2 to the person (eye) is smaller than 25 m. Since the laser light travels at a predetermined spread angle, the radiant flux of the laser light incident on the person (eye) becomes smaller in inverse proportion to the square of the distance from the headlamp 2 to the person (eye). Therefore, the distance from the headlamp 2 to the person (eye) that satisfies the safety standard class 1 is 25 [m] /√41.5=3.9 [m]. That is, when it is assumed that the laser light emitted from the left and right headlamps 2 is incident on the human eye (pupil), the distance from the headlamp 2 to the human eye is greater than about 3.9 m (far). )There is a need.

  However, if it is assumed that the distance between the left and right irradiation units 10 (headlights 2) is about 1.6 m, the passage areas S1 and S2 of light emitted from the left and right irradiation units 10 (headlights 2) overlap. Is approximately 6.75 m forward (P1 in FIG. 6). For this reason, in the front of about 3.9 m, the laser light emitted from either the left or right irradiation unit 10 (headlight 2) enters the human eye (pupil). In this case, the distance from the irradiation unit 10 (headlight 2) to the person (eye) satisfying the safety standard class 1 is 25 [m] / √ (41.5 × 2) = 2.74 [m]. It becomes. That is, when the distance from the irradiation unit 10 (headlight 2) to the person (eye) is larger (far) than about 2.74 m, the output of the laser generator 11 (green laser light generator 112) is reduced or stopped. There is no need to let them.

  On the other hand, when the distance from the irradiation unit 10 (headlight 2) to the person (eye) is about 2.74 m or less (or when it is likely to be about 2.74 m or less), the laser generator 11 Output is reduced or stopped. For example, when the distance from the irradiation unit 10 (headlight 2) to the person (eye) is about 1.37 m (= about 2.74 m / 2), the output of the laser generator 11 is about 1 / 4 or less.

  Next, a case where the laser light emitted from the laser generator 11 is red and green will be described.

When the illuminance of the green laser light in the illumination area A1 is 75 lx and the illuminance of the red laser light in the illumination area A1 is 75 lx, the luminous flux of the green laser light incident on the illumination area A1 is 75 [lx] × 1 [ m ² ] = 75 [lm], and the luminous flux of the red laser light incident on the illumination area A1 is also 75 [lx] × 1 [m ² ] = 75 [lm].

  Here, since the specific luminous sensitivity of light having a wavelength of about 532 nm (green light) is about 0.88 as described above, the radiant flux of the green laser light incident on the illumination area A1 is 75 [lm]. / 683 [lm / W] /0.88=0.125 [W]. In addition, since the relative visibility of light having a wavelength of about 640 nm (red light) with respect to light having a wavelength of 555 nm is about 0.17, the radiant flux of the red laser light incident on the illumination region A1 is 75 [lm ] / 683 [lm / W] /0.17=0.646 [W]. From these, the total of the radiant flux of the laser light that irradiates the illumination area A1 is 0.125 [W] +0.646 [W] = 0.711 [W].

As described above, the area of the human eye (pupil) is 3.85 × 10 ⁻⁵ m ² , and the area of the illumination region A1 is 1 m ² . For this reason, the radiant flux of laser light incident on the human eye (pupil) in front of 25 m is 0.771 [W] × 3.85 × 10 ⁻⁵ [m ² ] / 1 [m ² ] = 29.7. [ΜW].

  If the safety standard class 1 of the laser product is 0.4 mW and 0.4 mW is divided by 29.7 μW, 0.4 [mW] /29.7 [μW] = 13.5. That is, it means that the safety standard class 1 is satisfied even when about 13.5 times the radiant flux is incident on a human eye (pupil) in front of 25 m.

  Therefore, the distance from the headlamp 2 to the person (eye) that satisfies the safety standard class 1 is 25 [m] /√13.5=6.8 [m]. That is, when it is assumed that the laser light emitted from the left and right irradiation units 10 (headlamp 2) is incident on the human eye (pupil), the distance from the irradiation unit 10 (headlamp 2) to the human (eye) is , It must be about 6.8m or more away.

  However, the intensity of the laser beam emitted from the laser generator 11 is in the vicinity of the position P1 where light passing regions S1 and S2 of the light emitted from the left and right irradiation units 10 (headlamps 2) begin to overlap approximately 6.75 m ahead. Is a relatively low area. Specifically, the intensity distribution of the laser light emitted from the laser generator 11 is a Gaussian distribution, and the radiant flux in the vicinity of the position P1 where the light passing regions S1 and S2 begin to overlap approximately 6.75 m ahead. Is smaller than the radiant flux of the laser light traveling toward the illumination area A1. For this reason, even if the distance from the irradiation unit 10 (headlight 2) to the person (eye) is smaller than about 6.8 m (about 6.75 m), the safety standard class 1 is satisfied.

  When the person (eye) is closer to the irradiation unit 10 (headlight 2) than about 6.75 m, the laser light emitted from either the left or right irradiation unit 10 (headlight 2) is the human eye. It will enter the (pupil). In this case, the distance from the irradiation unit 10 (headlight 2) to the person (eye) that satisfies the safety standard class 1 is 25 [m] / √ (13.5 × 2) = 4.81 [m]. It becomes. That is, when the distance from the irradiation unit 10 (headlight 2) to the person (eye) is greater than about 4.81 m, the output of the laser generator 11 (red semiconductor laser element 111 and green laser light generator 112) is output. There is no need to lower or stop.

  On the other hand, when the distance from the irradiation unit 10 (headlight 2) to the person (eye) is about 4.81 m or less (or when it is likely to be about 4.81 m or less), the laser generator 11 Output is reduced or stopped. For example, when the distance from the irradiation unit 10 (headlight 2) to the person (eye) is about 2.41 m (= about 4.81 m / 2), the output of the laser generator 11 is about 1 / 4 or less.

  The distance from the irradiation unit 10 (headlight 2) to the person (eye) is about 6.8 m or less without considering that the intensity distribution of the laser light emitted from the laser generator 11 is a Gaussian distribution. (Or when it is likely to be about 6.8 m or less), the output of the laser generator 11 may be reduced or stopped.

  From the above, in the first embodiment, as shown in FIG. 7, when a person is present in the area B1 (hatched area in FIG. 7) (or when a person is likely to enter the area B1), laser is generated. The output of the vessel 11 is reduced or stopped. In addition, as shown in FIG. 8, when a person exists in area | region B2 (hatching area | region of FIG. 8) larger than area | region B1, the output of the laser generator 11 may be reduced or stopped.

  Moreover, the detection area | region which the detection part 20 detects a person is the area | region C of FIG. 7, for example, and contains area | region B1.

  Note that the detection area in which the detection unit 20 detects a person may be an area smaller than the area C in FIG. 7 as long as it includes the area B1 (or area B2). For example, the detection area may be the same as the area B1 (or area B2).

  Next, the operation of the headlamp 2 will be described.

  While the automobile 1 is traveling at night, the illumination areas A1 to A3 are illuminated by the headlamp 2. At this time, the light emitted from the headlamp 2 passes through the passage areas S1 and S2. Further, the detection unit 20 determines (detects) whether or not there is a person in the detection area.

  When the detection unit 20 detects a person existing in the detection region, a detection signal including information on a position (direction and distance) where the person exists is transmitted to the control unit 31. Then, the control unit 31 adjusts (controls) the output of the laser generator 11 so that the intensity of the laser light incident on the human eye (pupil) satisfies the safety standard class 1.

  As a result, it is possible to prevent high-intensity laser light from entering the eyes of a person existing in the area B1 (or a person existing in the vicinity of the area B1).

  When there are a plurality of people in the region B1, control is performed so that the intensity of the laser light incident on the eyes (pupils) of the plurality of people closest to the headlamp 2 satisfies the safety standard class 1. The output of the laser generator 11 is adjusted (controlled) by the unit 31.

  Thereafter, when the detection unit 20 no longer detects a person existing in the region B1 (or in the vicinity of the region B1) (when a person moves outside the detection region), the laser light emitted from the laser generator 11 The laser generator 11 is controlled by the control unit 31 so that the output is restored. Thereby, the illumination intensity of illumination area | region A1-A3 is ensured.

  The headlamp 2 may be configured so that the output of the laser generator 11 is sufficiently low or stopped while the automobile 1 is stopped. If the automobile 1 is stopped, it is not necessary to illuminate a far region in front. Further, the headlamp 2 may be configured to reduce the output of the laser generator 11 while the automobile 1 is traveling at a low speed (for example, less than 20 km / h). If the automobile 1 is traveling at a low speed, there is no need to irradiate a far region in front of the automobile 1, so that it does not hinder the traveling.

  The possibility that a person is present around the headlamp 2 of the automobile 1 is high particularly when the automobile 1 is stopped or traveling at a low speed, so that laser generation occurs while the automobile 1 is stopped or traveling at a low speed. If the output of the container 11 is lowered or stopped, the safety for the eyes can be further improved. Further, whether or not the automobile 1 is stopped or traveling at a low speed can be easily determined (detected) by the vehicle speed detector 3.

  In the above description, the case where the laser generator 11 is used as a traveling headlamp (high beam) has been described. However, the same applies to the case where the laser generator 11 is used as a passing headlamp (low beam). .

  However, the passing headlight (low beam) has a smaller output of the emitted laser light than the traveling headlight (high beam), and the illumination area and passing area are in the lateral direction (vehicle width direction). wide. For this reason, when the laser generator 11 is used as a passing headlamp (low beam), the radiant flux of laser light incident on the human eye (pupil) causes the laser generator 11 to travel through the headlamp (high beam). It becomes smaller than the case where it uses as. As a result, when the laser generator 11 is used as a passing headlamp (low beam), the laser is generated until the distance from the irradiation unit 10 (headlamp 2) to the person (eye) is closer than the above-described distance. There is no need to reduce or stop the output of the vessel 11.

  In the first embodiment, as described above, the headlamp 2 is configured to emit the laser light emitted from the laser generator 11 without using a phosphor or the like. As a result, the laser light emitted from the laser generator 11 travels in a predetermined direction with a predetermined spread angle. Therefore, the headlamp 2 is not provided with a reflecting mirror for reflecting the light in a predetermined direction. , Light utilization efficiency can be improved. For this reason, the utilization efficiency of light can be improved while reducing the size of the entire headlamp 2. Moreover, since it is not necessary to provide a reflecting mirror, it is possible to suppress the occurrence of light loss in the reflecting mirror. Thereby, the utilization efficiency of light can be improved more.

  Further, since no phosphor is used, there is no need to provide a heat radiating member for radiating heat generated in the phosphor. Thereby, compared with the case where fluorescent substance is used, the headlamp 2 can be reduced more in size. Further, since no phosphor is used, it is possible to prevent light loss from occurring in the phosphor, and it is possible to further improve the light utilization efficiency.

  Moreover, in 1st Embodiment, as mentioned above, the detection part 20 which detects the person who exists in the detection area containing a part of passage area | region S1 and S2 of the laser beam radiate | emitted from the headlamp 2, and a detection part A control unit 31 is provided for reducing or stopping the output of the laser generator 11 when 20 detects a person existing in the detection region. Thereby, since it can suppress that the laser beam which has coherence property injects into a human eye with high intensity | strength, it suppresses that the laser beam radiate | emitted from the headlamp 2 has a bad influence on a human eye. can do.

  In the first embodiment, as described above, the control unit 31 is configured to reduce or stop the output of the laser generator 11 based on the position (direction and distance) where a person exists. Since the laser light travels at a predetermined spread angle as described above, the intensity of the laser light incident on the human eye increases as the headlight 2 is approached. For this reason, as described above, the detection unit 20 is configured to detect the position (direction and distance) where a person exists, and when the distance from the headlamp 2 to the person becomes a predetermined value or less, the laser By configuring the control unit 31 to reduce or stop the output of the generator 11, it is possible to easily suppress the laser light emitted from the headlamp 2 from entering the human eye with high intensity. . Moreover, since the output of a laser beam is not reduced or stopped when the distance from the headlamp 2 to a person is larger than a predetermined value, it can suppress that illumination area | region A1-A3 becomes dark. Thereby, it can suppress that a visual field worsens (it becomes dark).

  In the first embodiment, as described above, the control unit 31 is configured to reduce or stop the output of the laser generator 11 based on the wavelength of the laser light emitted from the headlamp 2. Due to the difference in the wavelength of the laser beam, the intensity of the laser beam that adversely affects the human eye varies. Therefore, as described above, by configuring the control unit 31 to reduce or stop the output of the laser generator 11 based on the wavelength of the laser light emitted from the headlamp 2, the headlamp is configured. It is possible to easily suppress the laser light emitted from 2 from entering the human eye with high intensity. Thereby, it can suppress easily that a laser beam has a bad influence on a human eye.

  In the first embodiment, as described above, the laser beam emitted from the laser generator 11 is emitted from the headlamp 2 by providing the lens 12 that emits the laser beam from the headlamp 2 at a predetermined spread angle. It is possible to easily set the light distribution pattern by the laser beam to a desired shape.

  In the first embodiment, the red semiconductor laser element 111 is used as the laser generator 11 as described above. Since the semiconductor laser element (red semiconductor laser element 111) is smaller and lighter and consumes less power than laser generators other than the semiconductor laser element, the red semiconductor laser element 111 is used as the laser generator 11. Is particularly effective. The semiconductor laser element (red semiconductor laser element 111) has a higher output than the LED. For this reason, compared with the case where LED is used as a light source, the number of light sources can be reduced and a light source can be further reduced in size and weight.

(Second Embodiment)
In the second embodiment, a case where the laser generator 11 also includes a blue semiconductor laser element 113 will be described with reference to FIGS. 9 and 10, unlike the first embodiment.

  In the irradiation unit 10a according to the second embodiment of the present invention, as shown in FIG. 9, the laser generator 11 includes a red semiconductor laser element 111, a green laser light generator 112, and a blue semiconductor that emits blue laser light. A laser element 113. Thereby, compared with the said 1st Embodiment, it is possible to improve visibility more. The blue semiconductor laser element 113 is an example of the “semiconductor laser element” in the present invention.

  The blue semiconductor laser element 113 has a function of emitting blue laser light having a center wavelength of about 450 nm. The blue semiconductor laser element 113 can adopt a conventionally known structure. For example, the blue semiconductor laser element 113 includes an n-type GaN substrate, an n-type AlGaN cladding layer, an InGaN multiple quantum well active layer, a p-type AlGaN cladding layer, and a p-type GaN contact layer provided in this order on the upper surface of the n-type GaN substrate. And a p-side electrode and an n-side electrode provided on the lower surface of the n-type GaN substrate.

  The laser light emitted from the blue semiconductor laser element 113 is emitted so as to spread in an elliptical cone shape. Since the light distribution pattern required for the headlamp 2 of the automobile 1 is a horizontally long pattern, the blue semiconductor laser element 113 is arranged so that the long axis of the emitted laser light irradiation pattern is substantially horizontal. It is preferable to do.

  In addition, a lens 123 (lens 12) is disposed in the vicinity of the laser light emitting end of the blue semiconductor laser element 113. Similarly to the lenses 121 and 122, the lens 123 also has a light distribution pattern by laser light to be emitted (transmitted), a light distribution pattern of a low-beam headlight (low beam) and a driving headlight that are defined in detail by law. It is formed so as to satisfy the light distribution pattern of the lamp (high beam).

  Here, the relative luminous efficiency of light having a wavelength of about 450 nm (blue light) to light having a wavelength of 555 nm is about 0.038, which is smaller than that of red light or green light (532 nm). For this reason, in the second embodiment, the output of the laser generator 11 is reduced or stopped even when the distance from the left and right irradiation units 10a (headlights 2) to the person (eye) is about 6.75 m or more. There may be a need.

  And in 2nd Embodiment, as shown in FIG. 10, when a person exists in the one part area | region B3 of the area | region where the passage area | region S1 and S2 of the light radiate | emitted from both irradiation units 10a overlap, both right and left The laser generator 11 is controlled by the control unit 31 so as to reduce or stop the output of the laser light emitted from the laser generator 11 of the irradiation unit 10a. The passing area S1 is an example of the “first passing area” in the present invention, and the passing area S2 is an example of the “second passing area” in the present invention. The region B3 is an example of the “superimposed region” in the present invention.

  On the other hand, when a person is present in the passage region B4 of light emitted from one of the left and right irradiation units 10a (for example, the left irradiation unit 10a), one of the left and right irradiation units 10a ( For example, the laser generator 11 is controlled by the control unit 31 so that the output of the laser light emitted from the laser generator 11 of the left irradiation unit 10a) is reduced or stopped. At this time, the control unit 31 increases or maintains the output of the laser light emitted from the laser generator 11 of the other irradiation unit 10a (for example, the right irradiation unit 10a) of the left and right irradiation units 10a. The laser generator 11 may be controlled. The passing area B4 is an example of the “area other than the overlapping area” in the present invention. Further, the laser generator 11 of one irradiation unit 10a of the left and right irradiation units 10a is an example of the “first laser generator” in the present invention. The laser generator 11 of the other irradiation unit 10a among the left and right irradiation units 10a is an example of the “second laser generator” in the present invention.

  Other structures and operations of the second embodiment are the same as those of the first embodiment.

  In the second embodiment, as described above, when a person is present in a partial region B3 of the region where the light passing regions S1 and S2 that are emitted from both the left and right irradiation units 10a overlap, The control unit 31 controls the laser generator 11 so that the output of the laser light emitted from the laser generator 11 is reduced or stopped. Thereby, since it can suppress easily that the laser beam radiate | emitted from the headlamp 2 injects into a human eye with high intensity | strength, it can suppress easily that a laser beam has a bad influence on a human eye. Can do.

  In the second embodiment, as described above, for example, when a person is present in the passage region B4 of the light emitted from the left irradiation unit 10a, the laser emitted from the laser generator 11 of the right irradiation unit 10a. The controller 31 controls the laser generator 11 so as to increase or maintain the light output. Thereby, since it can suppress that illumination area | region A1-A3 becomes dark, it can suppress that a visual field becomes bad (dark).

  Other effects of the second embodiment are the same as those of the first embodiment.

  The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is shown not by the above description of the embodiments but by the scope of claims for patent, and further includes all modifications within the meaning and scope equivalent to the scope of claims for patent.

  For example, in the above-described embodiment, an example in which the headlamp of the present invention is used in an automobile has been shown. However, the present invention is not limited to this, and the headlamp of the present invention is not limited to an airplane, a ship, a robot, a motorcycle, or a bicycle. Or, it may be used for other moving objects. Further, the headlamp of the present invention may be used as a flashlight, and in this case, it may be used as a headlight (flashlight) that is fixed to a human head. Since the headlamp of the present invention can be reduced in size and weight, it can also be used as a headlight (flashlight) that is fixed to a human head.

  In the above embodiment, an example in which a semiconductor laser element is used as a laser generator that emits red or blue laser light has been described. However, the present invention is not limited to this, and a laser generator other than the semiconductor laser element is used. It may be used.

  Further, in the above-described embodiment, an example in which the detection unit is configured to detect a position where a person (particularly the head) is present has been described. Part) may also be detected. The headlamp may be configured so that the output of the laser generator is not reduced or stopped when a person (particularly the head) is facing backward (when the rear side of the head is seen when viewed from the automobile). . Moreover, you may comprise a detection part so that the position of a human eye may be detected.

  Moreover, although the said embodiment demonstrated the example using 1 type of sensor which light-receives (receives) infrared rays, visible light, an ultrasonic wave, a millimeter wave, etc., this invention is not limited to this, infrared rays, visible light, super Two or more types of sensors that receive (receive) sound waves or millimeter waves may be used in combination.

  In the above-described embodiment, an example in which one irradiation unit is provided at each of the left and right front end portions of the automobile has been described. However, the present invention is not limited thereto, and only one irradiation unit may be provided. You may provide above. In addition, the headlamp of the present invention can be extremely downsized as compared with a general headlamp, and therefore can be arranged at any position.

  In the first embodiment, the headlamp is configured to emit red light and green light. In the second embodiment, the headlamp is configured to emit red light, green light, and blue light. Although an example of the configuration has been described, the present invention is not limited to this, and the headlamp may be configured to emit light of a combination color different from the above. The headlamp may be configured to emit monochromatic light. Further, the headlamp may be configured to emit light including, for example, yellow light other than red light, green light, and blue light.

  Moreover, although the example which provided the laser generator inside the irradiation unit was shown in the said embodiment, this invention is not limited to this, You may arrange | position a laser generator outside the irradiation unit. In this case, a light guide member such as an optical fiber that guides the light emitted from the laser generator to the lens may be disposed between the laser generator and the lens. If comprised in this way, a laser generator can be arrange | positioned in a desired position. For this reason, for example, a laser generator can also be attached to the existing heat radiating member. In this case, the heat dissipation of the laser generator can be improved without providing a new heat dissipation member.

  Moreover, in the said embodiment, in order to obtain a desired light distribution pattern with the light radiate | emitted from an irradiation unit, although shown about the example which provided the lens in the laser beam emission end vicinity of a laser generator, this invention is not limited to this. If a desired light distribution pattern can be obtained by the light emitted from the irradiation unit (laser generator), the lens need not be provided.

  In the above embodiment, an example in which the laser generator is arranged so that the long axis of the irradiation pattern of the emitted laser light is substantially horizontal has been described. However, the present invention is not limited to this, and the emitted laser is You may arrange | position a laser generator so that the long axis of light may become substantially vertical.

  In the above embodiment, an example in which a lens is provided in the vicinity of the laser light emitting end of the green laser light generating device has been described. May not be provided. In this case, a lens may be incorporated in the green laser light generator.

  In the above embodiment, an example in which a lens is provided so as to correspond to each of the plurality of laser generators has been described. However, the present invention is not limited to this, and the first modification of the present invention shown in FIG. One lens 12a or 12b may be provided for the plurality of laser generators 11, like the irradiation unit 10b according to FIG. 12 or the irradiation unit 10c according to the second modification of the present invention shown in FIG.

  Moreover, although the said embodiment showed about the example which comprised the irradiation unit so that illumination area | region A1-A3 of a width of 4.5 m may be irradiated to the horizontal direction in 25 m ahead of a motor vehicle, this invention is not limited to this. First, like the irradiation unit 10d according to the third modification of the present invention shown in FIG. 13, the illumination areas A1 to A4 having a width wider than 4.5 m are irradiated in the horizontal direction in front of the vehicle 1 25 m. It may be configured.

  Moreover, in the said embodiment, although the example which provided the human sensitive sensor and the analysis part in the detection part was shown, this invention is not limited to this, An analysis part is not provided in a detection part, A control part is used from a human sensitive sensor. The detection signal may be received to determine (detect) whether or not a person is present in the detection area in front of the automobile.

2 Headlamp 11 Laser generator 12, 12a, 12b Lens 20 Detection unit 31 Control unit 111 Red semiconductor laser element (semiconductor laser element)
112a Infrared semiconductor laser device (semiconductor laser device)
113 Blue semiconductor laser element (semiconductor laser element)
B3 area (overlapping area)
B4 area (areas other than the overlapping area)
C area (detection area)
S1 passing area (first passing area)
S2 passing area (second passing area)

Claims (14)

A headlamp that emits laser light having coherence,
A detection unit for detecting a person existing in a detection region including at least a part of a passage region of the laser light emitted from the headlamp;
A headlamp, comprising: an output adjustment unit that reduces or stops the output of a laser generator that functions as a laser light source when the detection unit detects a person existing in the detection region. The detector has a function of detecting a distance from the headlamp to the person,
The headlamp according to claim 1, wherein the output adjustment unit reduces or stops the output of the laser generator when a distance from the headlamp to the person becomes a predetermined value or less. light. The detection unit has a function of detecting a position where a person exists,
The headlamp according to claim 1, wherein the output adjustment unit reduces or stops the output of the laser generator based on a position where the person is present.   The said output adjustment part reduces or stops the output of the said laser generator based on the wavelength of the laser beam radiate | emitted from the said headlamp, The any one of Claims 1-3 characterized by the above-mentioned. Headlamps.   The headlamp according to any one of claims 1 to 4, further comprising a lens that emits laser light emitted from the laser generator from the headlamp at a predetermined spread angle.   The headlamp according to claim 5, wherein the lens transmits the laser light from the laser generator with at least a small vertical spread angle.   The headlamp according to claim 5 or 6, wherein the lens transmits laser light from the laser generator with a horizontal spread angle and a vertical spread angle different from each other.   The headlamp according to any one of claims 1 to 7, wherein the laser generator includes a plurality of laser generators having different oscillation wavelengths.   The headlamp according to any one of claims 1 to 8, wherein the laser beam emitted from the headlamp includes a green laser beam and a red laser beam. The laser generator includes a first laser generator and a second laser generator,
There is a person in the overlapping region where the first passing region through which the laser beam emitted from the first laser generator passes and the second passing region through which the laser beam emitted from the second laser generator passes are overlapped. In this case, the output adjusting unit reduces or stops the outputs of both the first laser generator and the second laser generator,
When a person is present in a region other than the overlapping region in the first passing region and the second passing region, the output adjusting unit is at least one of the first laser generator and the second laser generator. The headlamp according to any one of claims 1 to 9, wherein the output of the lamp is reduced or stopped.   When a person is present in an area other than the superimposition area among the first passage area and the second passage area, the output adjustment unit is configured to output the other of the first laser generator and the second laser generator. The headlamp according to claim 10, wherein the output is increased or maintained.   The headlamp according to any one of claims 1 to 11, wherein the detection unit includes at least one of an infrared sensor, an ultrasonic sensor, a millimeter wave radar, and a visible light camera.   The headlamp according to any one of claims 1 to 12, wherein the laser generator includes a semiconductor laser element.   The output adjusting unit generates the laser so that the intensity of laser light emitted from the headlamp and incident on the human eye is less than or equal to class 1 intensity defined by safety standards for laser products of JIS C 6802. The headlamp according to any one of claims 1 to 13, wherein the output of the instrument is reduced or stopped.

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