JP6445441B2 - Optical unit - Google Patents

Description

  The present invention relates to an optical unit, and more particularly to an optical unit used for a vehicular lamp.

  Conventionally, an optical unit including a rotating reflector that rotates around a rotation axis while reflecting light emitted from a light source has been devised (see Patent Document 1). In this optical unit, the rotating reflector is provided with a reflecting surface so that the light of the light source reflected while rotating forms a desired light distribution pattern.

International Publication No. 11/129105 Pamphlet

  By the way, the above-described optical unit can realize a rectangular high-beam light distribution pattern by scanning the front with reflected light as the rotating reflector rotates. Further, by controlling the timing of turning on and off the light source, a high beam light distribution pattern in which an arbitrary region is shielded can be realized.

  The present invention has been made in view of such a situation, and an object thereof is to provide a technique related to an optical unit capable of realizing a high-quality light distribution pattern.

  In order to solve the above problems, an optical unit according to an aspect of the present invention includes a light source and a rotating reflector that rotates around a rotation axis while reflecting light emitted from the light source. In this optical unit, the rotating reflector is provided with a reflecting surface so that the light of the light source reflected while rotating forms a light distribution pattern. The optical unit includes a first irradiation mode when the light emitted from the light source irradiates the central portion of the light distribution pattern, and a second irradiation mode when the light emitted from the light source irradiates the end portion of the light distribution pattern. And are configured differently. According to this aspect, it is possible to vary the irradiation aspect of a part of the light distribution pattern.

  The reflection surface may include a first region in which light that irradiates the central portion of the light distribution pattern is reflected, and a second region in which light that irradiates the end portion of the light distribution pattern is reflected. The reflectivity of the first region may be different from the reflectivity of the second region. Thereby, the brightness can be changed between the first region and the second region of the light distribution pattern.

  The reflection surface may include a first region in which light that irradiates the central portion of the light distribution pattern is reflected, and a second region in which light that irradiates the end portion of the light distribution pattern is reflected. The second region may include a wavelength conversion unit that emits light having a wavelength different from that of the light emitted from the light source. The wavelength conversion unit is, for example, a phosphor or a colored reflecting member. Thereby, the color of the light reflected by the 2nd area | region of a reflective surface can be varied with respect to the color of light source light.

  You may further provide the light-receiving part which receives a part of light reflected by the reflective surface, and the control part which controls the output of the light radiate | emitted from a light source based on the output of a light-receiving part. The light receiving unit may be arranged so as not to hinder the formed light distribution pattern. Thereby, the output of the light emitted from the light source can be stabilized.

  The light source and the rotating reflector form a light distribution pattern by scanning the light emitted from the light source by the rotation operation as an irradiation beam, and change the scanning speed in the first irradiation mode and the second irradiation mode, or You may be comprised so that the output of the light radiate | emitted from a light source may be changed. Thereby, the brightness of the light distribution pattern can be controlled.

  ADVANTAGE OF THE INVENTION According to this invention, the optical unit which can implement | achieve a high quality light distribution pattern can be provided.

It is a horizontal sectional view of the vehicle headlamp according to the present embodiment. It is the top view which showed typically the structure of the lamp unit containing the optical unit which concerns on this Embodiment. It is a side view at the time of seeing a lamp unit from the A direction shown in FIG. It is a schematic diagram which shows the state which irradiated the vehicle front with the vehicle headlamp which concerns on this Embodiment. It is a schematic diagram which shows an example of the light distribution pattern in the vehicle headlamp which concerns on 1st Embodiment. It is the figure which showed typically the control block in the vehicle provided with the vehicle headlamp which concerns on this Embodiment.

  Hereinafter, the present invention will be described based on embodiments with reference to the drawings. The same or equivalent components, members, and processes shown in the drawings are denoted by the same reference numerals, and repeated descriptions are omitted as appropriate. Further, the embodiments do not limit the invention but are exemplifications, and all features and combinations thereof described in the embodiments are not necessarily essential to the invention.

  The optical unit of the present invention can be used for various vehicle lamps. Below, the case where the optical unit of this invention is applied to the vehicle headlamp among vehicle lamps is demonstrated.

(First embodiment)
FIG. 1 is a horizontal sectional view of a vehicle headlamp according to the present embodiment. The vehicle headlamp 10 is a right-hand headlamp mounted on the right side of the front end portion of the automobile, and has the same structure except that it is symmetrical to the headlamp mounted on the left side. Therefore, in the following, the right vehicle headlamp 10 will be described in detail, and the description of the left vehicle headlamp will be omitted.

  As shown in FIG. 1, the vehicle headlamp 10 includes a lamp body 12 having a recess opening forward. The lamp body 12 has a front opening covered with a transparent front cover 14 to form a lamp chamber 16. The lamp chamber 16 functions as a space in which the two lamp units 18 and 20 are accommodated in a state of being arranged side by side in the vehicle width direction.

  Among the lamp units, the lamp unit 20 disposed on the outer side, that is, the upper side shown in FIG. 1 in the right vehicle headlamp 10 is a lamp unit having a lens so as to emit a variable high beam. It is configured. On the other hand, among these lamp units, in the vehicle headlamp 10 on the right side, the lamp unit 18 disposed on the lower side shown in FIG. 1 is configured to emit a low beam.

  The low beam lamp unit 18 includes a reflector 22, a light source bulb (incandescent bulb) 24 supported by the reflector 22, and a shade (not shown). The reflector 22 is a known means (not shown) such as an aiming screw and a nut. Is supported so as to be tiltable with respect to the lamp body 12.

  As shown in FIG. 1, the lamp unit 20 includes a rotary reflector 26, an LED 28, and a convex lens 30 as a projection lens disposed in front of the rotary reflector 26. Instead of the LED 28, a semiconductor light emitting element such as an EL element or an LD element, or a phosphor that emits light by excitation with light from the LD element can be used as the light source. In particular, a light source that can be turned on and off accurately in a short time is preferable for the control for shielding a part of a light distribution pattern described later. The shape of the convex lens 30 may be appropriately selected according to the light distribution characteristics such as a required light distribution pattern and illuminance distribution, but an aspherical lens or a free-form surface lens is used. In the present embodiment, an aspheric lens is used as the convex lens 30.

  The rotary reflector 26 is rotated in one direction around the rotation axis R by a drive source such as a motor (not shown). The rotating reflector 26 includes a reflecting surface configured to reflect the light emitted from the LED 28 while rotating to form a desired light distribution pattern. In the present embodiment, the rotary reflector 26 constitutes an optical unit.

  FIG. 2 is a top view schematically showing the configuration of the lamp unit 20 including the optical unit according to the present embodiment. FIG. 3 is a side view when the lamp unit 20 is viewed from the direction A shown in FIG.

  In the rotating reflector 26, three blades 26a having the same shape and functioning as a reflecting surface are provided around a cylindrical rotating portion 26b. A rotation axis R of the rotary reflector 26 is inclined with respect to the optical axis Ax, and is provided in a plane including the optical axis Ax and the LED 28. In other words, the rotation axis R is provided substantially parallel to the scanning plane of the light (irradiation beam) of the LED 28 that scans in the left-right direction by rotation. Thereby, thickness reduction of an optical unit is achieved. Here, the scanning plane can be regarded as, for example, a fan-shaped plane formed by continuously connecting the light traces of the LEDs 28 as scanning light. Further, in the lamp unit 20 according to the present embodiment, the LED 28 provided is relatively small, and the position where the LED 28 is disposed is also between the rotating reflector 26 and the convex lens 30 and deviated from the optical axis Ax. . Therefore, as compared with the case where the light source, the reflector, and the lens are arranged in a line on the optical axis as in a conventional projector-type lamp unit, the depth direction of the vehicle headlamp 10 (vehicle longitudinal direction) Can be shortened.

  Further, the shape of the blade 26 a of the rotary reflector 26 is configured such that the secondary light source of the LED 28 by reflection is formed near the focal point of the convex lens 30. The blade 26a has a shape twisted so that the angle formed by the optical axis Ax and the reflecting surface changes as it goes in the circumferential direction about the rotation axis R. As a result, as shown in FIG. 2, scanning using the light of the LED 28 becomes possible.

  Subsequently, when the rotating reflector 26 rotates, the light reflection direction of the LED 28 changes toward the other end of the left and right ends of the vehicle front area where the light distribution pattern is formed. The rotating reflector 26 according to the present embodiment is configured to be able to scan forward in one direction (horizontal direction) once by the light of the LED 28 by rotating 120 degrees. In other words, when one blade 26 a passes in front of the LED 28, a desired area in front of the vehicle is scanned once by the light of the LED 28.

  The number and shape of the blades 26a and the rotational speed of the rotary reflector 26 are appropriately set based on the results of experiments and simulations in consideration of the characteristics of the required light distribution pattern and the flicker of the scanned image. Moreover, a motor is preferable as a drive part which can change a rotational speed according to various light distribution control. Thereby, the scanning timing can be changed easily. As such a motor, a motor capable of obtaining rotation timing information from the motor itself is preferable. Specifically, a DC brushless motor is mentioned. When a DC brushless motor is used, rotation timing information can be obtained from the motor itself, so that devices such as an encoder can be omitted.

  Thus, the rotating reflector 26 according to the present embodiment can scan the front of the vehicle in the left-right direction using the light of the LED 28 by devising the shape and rotation speed of the blade 26a.

  The vehicular headlamp 10 according to the present embodiment can form a substantially rectangular high beam light distribution pattern by reflecting the light of the LED 28 with the rotating reflector 26 and scanning the front with the reflected light. it can. In this way, since a desired light distribution pattern can be formed by rotating the rotating reflector 26 in one direction, there is no need for driving by a special mechanism such as a resonant mirror, and the reflecting surface of the reflecting mirror is not required. There are few restrictions on size. Therefore, by selecting the rotating reflector 26 having a larger reflecting surface, the light emitted from the light source can be efficiently used for illumination. That is, the maximum luminous intensity in the light distribution pattern can be increased. Note that the rotating reflector 26 according to the present embodiment has substantially the same diameter as the convex lens 30, and the area of the blade 26a can be increased accordingly.

  In addition, the vehicle headlamp 10 including the optical unit according to the present embodiment can block any region by synchronizing the turn-on / off timing of the LED 28 and the change in luminous intensity with the rotation of the rotary reflector 26. A high beam light distribution pattern can be formed. Further, when the luminous intensity of the LED 28 is changed (turned on and off) in synchronization with the rotation of the rotary reflector 26 to form a high-beam distribution pattern, the distribution pattern itself is swiveled by shifting the phase of the luminous intensity change. Control is also possible.

  FIG. 4 is a schematic diagram showing a state in which the vehicle front is illuminated by the vehicle headlamp 10 according to the present embodiment. The low beam light distribution pattern PL shown in FIG. 4 is formed by the lamp unit 18 of the vehicle headlamp 10. The high beam light distribution pattern PH is formed by the lamp unit 20 of the vehicle headlamp 10. In the high-beam light distribution pattern PH, a part of the region R <b> 1 is shielded from light by synchronizing the turn-on / off timing of the LED 28 with the rotation of the rotary reflector 26. Thereby, it is reduced to give glare to the preceding vehicle 32 and the oncoming vehicle that travel in front of the host vehicle.

  As described above, the vehicle headlamp according to the present embodiment forms a light distribution pattern by scanning the light of the LED, and controls a change in the light emission intensity so as to be a part of the light distribution pattern. A light shielding portion can be arbitrarily formed. Therefore, as compared with the case where a part of the plurality of LEDs is turned off and the light shielding portion is formed, a desired area can be shielded with high accuracy by a small number of LEDs. In addition, since the vehicle headlamp 10 can form a plurality of light shielding portions, even if there are a plurality of vehicles ahead, it is possible to shield a region corresponding to each vehicle. Become.

  Moreover, since the vehicle headlamp 10 can perform the light shielding control without moving the basic light distribution pattern, it is possible to reduce a sense of discomfort given to the driver during the light shielding control. Moreover, since the light distribution pattern can be swiveled without moving the lamp unit 20, the mechanism of the lamp unit 20 can be simplified. For this reason, the vehicle headlamp 10 only needs to have a motor necessary for the rotation of the rotary reflector 26 as a drive unit for variable light distribution control, which simplifies the configuration, reduces costs, and reduces the size. It is illustrated.

  Next, the rotary reflector 26 that is an optical unit according to the present embodiment will be described in more detail. FIG. 5 is a schematic diagram illustrating an example of a light distribution pattern in the vehicle headlamp 10 according to the first embodiment. As shown in FIG. 5, the rotary reflector 26 according to the present embodiment includes a first irradiation mode when light emitted from the LED 28 irradiates (forms) a central region PH1 of the high beam light distribution pattern PH, and a light source. The emitted light is configured to be different from the second irradiation mode when the end region PH2 of the high beam light distribution pattern PH is irradiated (formed).

  That is, the lamp unit 20 can vary the irradiation mode of a part of the high beam light distribution pattern PH. The irradiation mode is a mode defined by, for example, whether or not it is diffused light, the color of each irradiation region, the brightness of each irradiation region, and the like.

  In the present embodiment, the blade 26a of the rotary reflector 26 is devised in order to realize different irradiation modes in the light distribution pattern. Specifically, as shown in FIG. 3, the reflection surface of the blade 26a includes a first region 26a1 where light that irradiates the central region PH1 of the high beam light distribution pattern PH is reflected, and an end of the high beam light distribution pattern. A second region 26a2 that reflects the light that irradiates the partial region PH2. The reflectance of the first region 26a1 and the reflectance of the second region 26a2 are different.

  In order to make the reflectance different, the material (metal) of the reflective film on the surface of the blade 26a is made different, the surface roughness is made of the same material, or some other substance (such as barium sulfate) is used. It becomes possible by applying. More specifically, when forming the undercoat agent for aluminum deposition, mask the areas where you want to roughen the surface, dare to make a poor quality film, change the thickness of aluminum, or part after forming the aluminum deposition film The reflectance can be changed by sandblasting. Thereby, the brightness can be changed between the central region PH1 and the end region PH2 of the light distribution pattern.

  Further, the light reflected by the second region 26a2 of the blade 26a irradiates the end region PH2 of the high beam light distribution pattern PH. In the case of the vehicle headlamp 10, the end region PH2 corresponds to sidewalks on both sides of the road, and therefore, the target irradiated in the end region PH2 is mainly a pedestrian, not a vehicle. Therefore, a light distribution pattern that does not give glare to the pedestrian is preferable. Therefore, the rotary reflector 26 according to the present embodiment can reduce the glare by reducing the brightness of the end region PH2 of the high beam light distribution pattern by reducing the reflectance of the second region 26a2 of the blade 26a.

  Further, in order to widen the irradiation region near the end of the high beam light distribution pattern PH, the shape of the reflection surface of the second region 26a2 of the blade 26a is made, for example, a concavo-convex structure so that the light emitted from the LED 28 diffuses on the reflection surface. It is good. At this time, assuming that the entire reflection surface of the blade 26a has a concavo-convex structure, in the control for shielding a part of the light distribution pattern for high beam, the light shielding part (region R1 shown in FIG. 4) and the irradiation part (shown in FIG. 4) are used. The boundary with the region R2) becomes unclear. Therefore, in order to ensure that glare is not given to vehicles such as the preceding vehicle 32, it is necessary to widen the light-shielding portion in the high-beam light distribution pattern. Will be invited.

  Accordingly, by mainly diffusing the reflected light from the second region 26a2 of the blade 26a, a wider range of light distribution can be realized while satisfying the visibility in the central region PH1 of the high beam light distribution pattern PH. Further, by forming the reflecting surface of the blade 26a so that light is diffused, even in the case of a point light source having a small spread such as laser light, for example, a wide range of light distribution patterns can be realized.

  As described above, by devising the surface state and surface shape of the blade 26a of the rotary reflector 26, the high-quality arrangement in which the irradiation mode is locally changed compared to the state where the surface of the blade 26a is uniform. A light pattern can be realized.

  The second region 26a2 of the reflecting surface of the blade 26a may include a phosphor as a wavelength conversion unit that is excited by light emitted from the LED 28 and emits light having a wavelength different from that of the LED 28. The phosphor may be disposed on the surface of the second region 26a2 or may constitute a part of the second region 26a2. Thereby, the color of the light reflected by the 2nd area | region of the blade 26a can be varied with respect to the color of the light of LED28. That is, the color of the high beam light distribution pattern can be changed in a partial region. In addition, as a wavelength conversion part, the structure comprised so that the reflectance of a specific wavelength may be reduced among the lights (for example, white light) from a light source, such as a colored reflective surface. That is, the colored reflecting surface emits light having a wavelength (color) different from that of the light emitted from the light source. Therefore, even when such a colored reflection surface is used as the wavelength conversion unit, the color of light reflected by the second region of the blade 26a can be made different from the color of light of the LED 28.

  The phosphor may be disposed not in the second region 26a2 but in the first region 26a1, or in both the first region 26a1 and the second region 26a2. Further, the phosphor may be of one type or a plurality of types, and the same type of phosphor may be arranged with the concentration varied depending on the region. Further, since the phosphor is Lambertian light emission, a condensing reflector may be disposed in front of the reflecting surface.

  In addition, the phosphors arranged on the surface of the second region 26a2 may be selected so that the color of the irradiation light of the end region PH2 of the high beam light distribution pattern PH becomes magenta. When a pedestrian is irradiated with light of magenta color, the skin of the pedestrian appears to be a strange color, so that the driver can easily notice the pedestrian.

  Next, control of the vehicle headlamp 10 according to the present embodiment will be described. FIG. 6 is a diagram schematically showing a control block in a vehicle provided with the vehicle headlamp according to the present embodiment.

  The vehicle 100 controls the vehicle headlamp 10, the lamp actuator 34, the drive module 36 that drives the LED 28, the camera 38 that captures the front of the vehicle, the vehicle information acquisition unit 40, and the vehicle headlamp 10. And a lamp ECU 42 for performing. The vehicle headlamp 10 and the lamp ECU 42 are connected by a cable 44 capable of LIN (Local Interconnect Network) communication. The lamp ECU 42, the camera 38, and the vehicle information acquisition unit 40 are connected by cables 46 and 48 capable of CAN (Controller Area Network) communication. The vehicle information acquisition unit 40 acquires the steering angle information from the steering angle sensor, the vehicle speed information from the vehicle speed sensor, and the acceleration information from the acceleration sensor, for example, and transmits them to the lamp ECU 42.

  For example, the vehicle 100 detects a forward vehicle, a pedestrian, or the like based on image information captured by the camera 38, determines light distribution conditions in the lamp ECU 42 to realize light distribution suitable for the situation, and The lighting state of the headlamp 10 can be controlled. Further, the lamp unit 20 of the vehicle headlamp 10 according to the present embodiment includes an optical sensor as a light receiving unit that receives a part of the light reflected by the blade 26a of the rotating reflector 26, as shown in FIG. 50. The optical sensor 50 is, for example, a photoelectric conversion element (brightness sensor), and may be arranged so as not to disturb the formed light distribution pattern.

  Then, the optical sensor 50 transmits information on the intensity of the received light to the lamp ECU 42 via the cable 44. The lamp ECU 42 controls the drive module 36 so that the output of light emitted from the LED 28 is stabilized based on the output of the optical sensor 50. Thereby, according to the temperature and degradation of LED28, the output of the light radiate | emitted from LED28 can be stabilized.

(Second Embodiment)
In the first embodiment, the first irradiation mode when the light emitted from the light source irradiates the central portion of the light distribution pattern, and the second when the light emitted from the light source irradiates the end of the light distribution pattern. In order to make the irradiation mode different, the surface form of the blade 26a of the rotary reflector 26 is partially different.

  In the lamp unit 20 according to the present embodiment, the LED 28 and the rotary reflector 26 form a light distribution pattern by scanning light emitted from the LED 28 by the rotation operation as an irradiation beam, and the first irradiation mode and the second irradiation mode. In the irradiation mode, the scanning speed is changed, or the output of light emitted from the LED 28 is changed. Thereby, the brightness of the light distribution pattern can be controlled.

  Specifically, the rotational speed of the rotary reflector 26 at the timing when a part of the light distribution pattern is formed by the reflected light from the first region 26a1 of the blade 26a of the rotary reflector 26, and the second region 26a2 of the blade 26a. The rotational speed of the rotary reflector 26 at the timing when a part of the light distribution pattern is formed by the reflected light is made different. In this case, even if the surface form of the reflecting surface of the blade 26a is uniform and the intensity of the emitted light from the LED 28 is constant, the brightness (luminance) of the light distribution pattern can be locally changed.

  Further, the output of light emitted from the LED 28 at the timing when a part of the light distribution pattern is formed by the reflected light from the first region 26a1 of the blade 26a of the rotary reflector 26, and the reflection from the second region 26a2 of the blade 26a. The output of light emitted from the LED 28 at the timing when a part of the light distribution pattern is formed with light may be different. In this case, even if the surface form of the reflecting surface of the blade 26a is uniform and the rotational speed of the rotary reflector 26 is constant, the brightness (luminance) of the light distribution pattern can be locally changed.

  These controls synchronize the distance or phase from the reference position where light is scanned with the scanning speed and the light output modulation, so that predetermined locations of the light distribution pattern have the same brightness. Further, the lamp ECU 42 determines the driving environment based on the steering information and vehicle speed information acquired from the vehicle information acquisition unit 40, the image information acquired from the camera 38, and the like so that the luminance distribution becomes an optimal light distribution pattern. The headlamp 10 is controlled. For example, when a signboard or the like having a high reflectance is detected based on image information captured by the camera 38, the lamp ECU 42 controls the vehicle headlamp 10 so as to lower the luminance of the area corresponding to the signboard in the light distribution pattern. By doing so, glare due to reflected light from the signboard can be reduced.

  In addition, the lamp actuator 34 that rotates the rotary reflector 26 has a shorter life than a semiconductor such as the LED 28. Therefore, when the ADB (Adaptive Driving Beam) function is stopped, such as when the vehicle is stopped, the operation of the actuator may be stopped. Thereby, the lifetime of the actuator can be extended. When stopping the operation of the actuator, the position of the blade 26a of the rotary reflector 26 is the same every time (for example, the position where the light of the LED 28 reflected by the blade 26a is incident on the optical sensor 50). It is good to stop. Thereby, the control at the time of forming the light distribution pattern by rotating the rotary reflector 26 again becomes easy.

(Third embodiment)
In the case of a so-called scanning optical unit that scans the front with the light reflected by the blade 26 a by the rotation of the rotating reflector 26, air circulation occurs in the lamp chamber 52 of the vehicle headlamp 10 because there is a movable part. . Therefore, an environment adjusting unit 54 may be provided in the lamp chamber 52 as shown in FIG.

  Examples of the environmental adjustment unit 54 include a static elimination device (soft X-ray lamp, corona discharge device), a device containing a desiccant, a dustproof filter, an adhesive sheet, and the like. In addition, a housing that separates a space area including a movable part such as the rotating reflector 26 from other space areas may be provided. Alternatively, the lamp chamber 52 may have a structure in which a spatial region including a heat source such as a semiconductor excitation light source such as an LED and a spatial region including a blade 26 a that emits fluorescence with semiconductor excitation light and the rotating reflector 26 are separated. Good.

  As described above, the present invention has been described with reference to the above-described embodiments. However, the present invention is not limited to the above-described embodiments, and the configurations of the embodiments are appropriately combined or replaced. Those are also included in the present invention. Further, it is possible to appropriately change the combination and processing order in each embodiment based on the knowledge of those skilled in the art and to add various modifications such as various design changes to each embodiment. Embodiments to which is added can also be included in the scope of the present invention.

  In each of the above-described embodiments, the case where the optical unit is applied to a vehicular lamp has been described. However, the application is not necessarily limited to this field. For example, the present invention may be applied to a lighting apparatus in a stage or entertainment facility where lighting is performed by switching various light distribution patterns. Conventionally, lighting fixtures in such fields require a large drive mechanism for changing the illumination direction. However, in the case of the optical unit according to the present embodiment, there are various types according to the rotation of the rotating reflector and the turning on / off of the light source. Since a simple light distribution pattern can be formed, a large driving mechanism is not required and the size can be reduced.

  In addition, the optical unit according to each of the above embodiments is a rotary reflector provided with a blade, but may be a galvanometer mirror or a biaxial scan mirror.

  DESCRIPTION OF SYMBOLS 10 Vehicle headlamp, 12 Lamp body, 14 Front cover, 16 Lamp chamber, 20 Lamp unit, 22 Reflector, 26 Rotating reflector, 26a Blade, 26a1 1st area | region, 26a2 2nd area | region, 26b Rotating part, 28 LED, 30 convex lens, 32 preceding vehicle, 34 lamp actuator, 36 drive module, 38 camera, 40 vehicle information acquisition unit, 42 lamp ECU, 50 light sensor, 52 lamp chamber, 54 environment adjustment unit, 100 vehicle.

  The present invention relates to an optical unit, and in particular, can be used for an optical unit used in a vehicular lamp.

Claims (4)

A light source;
A rotating reflector that rotates around a rotation axis while reflecting light emitted from the light source, and an optical unit comprising:
The rotating reflector is
The reflection surface is provided so that the light of the light source reflected while rotating forms a light distribution pattern for high beam ,
The optical unit includes a first irradiation mode when the light emitted from the light source irradiates the central portion of the high-beam light distribution pattern, and the second irradiation when the light emitted from the light source irradiates the end of the light distribution pattern. It is configured to differ from the aspect ,
The reflective surface is
A first region where light that irradiates the central portion of the high beam light distribution pattern is reflected; and a second region where light that irradiates the end portion of the high beam light distribution pattern is reflected;
The optical unit according to claim 1, wherein the reflectance of the second region is lower than the reflectance of the first region . The reflective surface is
A first region where light that irradiates the central portion of the light distribution pattern is reflected; and a second region where light that irradiates the end of the light distribution pattern is reflected;
The optical unit according to claim 1, wherein the second region includes a wavelength conversion unit that emits light having a wavelength different from that of light emitted from the light source. A light receiving unit for receiving a part of the light reflected by the reflecting surface;
A control unit for controlling the output of light emitted from the light source based on the output of the light receiving unit,
The optical unit according to claim 1, wherein the light receiving unit is arranged so as not to obstruct a light distribution pattern to be formed. The light source and the rotating reflector are:
The light distribution pattern is formed by scanning the light emitted from the light source by the rotation operation as an irradiation beam,
In the first irradiation mode and the second irradiation mode, the scanning speed is changed, or the output of light emitted from the light source is changed.
The optical unit according to any one of claims 1 to 3, characterized in that.

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