JP6162497B2 - Lamp unit and vehicle lamp - Google Patents

Description

  The present invention relates to a lamp unit, and more particularly to a lamp unit used in a vehicular lamp.

  An optical unit including a rotating reflector that rotates in one direction around a rotation axis while reflecting light emitted from a light source is known (see Patent Document 1). The rotating reflector is provided with a plurality of blades provided in the circumferential direction of the rotating shaft, provided with a reflecting surface on which the reflected light forms a desired light distribution pattern. Since such an optical unit can form a desired light distribution pattern by rotating the rotating reflector in one direction, there is an advantage that the burden on the rotation driving unit of the reflector is small.

JP 2012-227102 A

  In the above optical unit, when light is incident on both adjacent blades at the same time, two irradiation beams appear in different directions at the same time, so that both ends of the light distribution pattern shine simultaneously. In such a case, there is a problem that it is difficult to independently control the irradiation state at both ends of the light distribution pattern.

  The present invention has been made in view of such circumstances, and an object of the present invention is to provide a technique for suppressing or preventing light from simultaneously entering both adjacent blades in a lamp unit including a rotating reflector. .

  A lamp unit according to an aspect of the present invention includes a light source and a rotating reflector that rotates about a rotation axis. The rotating reflector has a plurality of blades having a reflecting surface that reflects light emitted from the light source while forming a desired light distribution pattern while rotating by a predetermined angle in the circumferential direction of the rotating shaft. The blade was twisted so that the angle between the optical axis and the reflecting surface did not change as it went from the inside to the outside of the blade, and the angle between the optical axis and the reflecting surface changed as it went in the circumferential direction around the rotation axis. At least one of the blades having a shape so that the light from the light source is not incident on the reflective surface of the other adjacent blade when the light from the light source is incident on the reflective surface of the adjacent blade A part of is cut out.

  According to this aspect, when light from the light source is incident on the reflective surface of one adjacent blade, the light is not incident on the reflective surface of the other adjacent blade, so that both end portions of the light distribution pattern are simultaneously illuminated. Can be suppressed or prevented.

  The circumferential length of the notch of the blade may be reduced from the inside to the outside of the blade.

  You may provide a 2nd light source behind the notch part of a braid | blade. According to this, a function different from a 1st light source can be exhibited using a 2nd light source.

  The second light source may be lit while the rotary reflector rotates and the notch of the blade is positioned forward. According to this, since the light emitted from the second light source passes through the notch and is projected, light that is not reflected by the reflecting surface of the blade can be emitted.

  You may further provide the 2nd reflector which has a reflective surface which reflects the light from a 2nd light source toward the notch part of a braid | blade. According to this, the utilization efficiency of the light from the second light source can be increased.

  The second light source may be an infrared light source. According to this, it is possible to irradiate the area where the first light source is turned off with infrared rays and take an image with the camera.

  The second light source may be a semiconductor laser light source or a light source that excites a phosphor with a semiconductor laser.

  Another aspect of the present invention is a vehicular lamp using the lamp unit described above.

  ADVANTAGE OF THE INVENTION According to this invention, in a lamp unit provided with a rotation reflector, it can suppress or prevent that a light injects into both adjacent blades simultaneously.

1 is a horizontal sectional view of a vehicle headlamp according to a first embodiment. It is the top view which showed typically the structure of the lamp unit containing the optical unit which concerns on 1st Embodiment. It is a side view at the time of seeing a lamp unit from the A direction shown in FIG. FIG. 4A to FIG. 4E are perspective views showing the state of the blade according to the rotation angle of the rotary reflector in the lamp unit according to the first embodiment. FIGS. 5A to 5E are diagrams showing projection images at the scanning position where the rotary reflector corresponds to the states of FIGS. 4F to 4J. FIG. 6A is a diagram showing a light distribution pattern when a range of ± 5 degrees to the left and right with respect to the optical axis is scanned using the vehicle headlamp according to the first embodiment. ) Is a diagram showing the luminous intensity distribution of the light distribution pattern shown in FIG. 6A, and FIG. 6C is one place in the light distribution pattern using the vehicle headlamp according to the first embodiment. 6 (d) is a diagram showing the luminous intensity distribution of the light distribution pattern shown in FIG. 6 (c), and FIG. 6 (e) is the front view for a vehicle according to the first embodiment. FIG. 6 (f) is a diagram showing a light intensity distribution of the light distribution pattern shown in FIG. 6 (e). It is a perspective view of the rotary reflector which concerns on 2nd Embodiment. It is the top view which showed typically the structure containing the lamp unit which concerns on 2nd Embodiment. It is a perspective view of the rotary reflector which concerns on 3rd 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 lamp unit of the present invention can be used for various vehicle lamps. Below, the case where the lamp 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 a first 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 may be used as a light source. Further, instead of the LED 28, a semiconductor laser, a light source that excites a phosphor with a semiconductor laser, or a combination of these and an LED may be used as a 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 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. As a result, as shown in FIG. 2, scanning using the light of the LED 28 becomes possible. This point will be further described in detail.

  FIG. 4A to FIG. 4E are perspective views showing the state of the blade according to the rotation angle of the rotary reflector 26 in the lamp unit according to the present embodiment. 4 (f) to 4 (j) are diagrams for explaining that the direction in which light from the light source is reflected changes corresponding to the states of FIGS. 4 (a) to 4 (e). .

  FIG. 4A shows a state where the LED 28 is arranged so as to irradiate the boundary region between the two blades 26a1 and 26a2. In this state, as shown in FIG. 4F, the light of the LED 28 is reflected in a direction oblique to the optical axis Ax by the reflecting surface S of the blade 26a1. As a result, one end region of the left and right ends of the vehicle front region where the light distribution pattern is formed is irradiated. Thereafter, when the rotary reflector 26 rotates and enters the state shown in FIG. 4B, the blade 26a1 is twisted, so that the reflection surface S (reflection angle) of the blade 26a1 that reflects the light of the LED 28 changes. As a result, as shown in FIG. 4G, the light from the LED 28 is reflected in a direction closer to the optical axis Ax than the reflection direction shown in FIG.

  Subsequently, when the rotating reflector 26 rotates as shown in FIGS. 4C, 4D, and 4E, the light reflection direction of the LED 28 is an area in front of the vehicle where the light distribution pattern is formed. Of these, it changes toward the other end of the left and right ends. 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. As shown in FIGS. 4F to 4J, the secondary light source (light source virtual image) 31 moves to the left and right in the vicinity of the focal point of the convex lens 30. 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. FIGS. 5A to 5E are diagrams showing projection images at the scanning position where the rotary reflector corresponds to the states of FIGS. 4F to 4J. The unit of the vertical axis and the horizontal axis in the figure is degree (°), and indicates the irradiation range and irradiation position. As shown in FIGS. 5A to 5E, the projection image moves in the horizontal direction by the rotation of the rotary reflector 26.

  FIG. 6A is a diagram showing a light distribution pattern when a range of ± 5 degrees to the left and right of the optical axis is scanned using the vehicle headlamp according to the present embodiment, and FIG. The figure which shows the luminous intensity distribution of the light distribution pattern shown to Fig.6 (a), FIG.6 (c) is the state which light-shielded one place among the light distribution patterns using the vehicle headlamp which concerns on this Embodiment. FIG. 6 (d) is a diagram showing the luminous intensity distribution of the light distribution pattern shown in FIG. 6 (c), and FIG. 6 (e) is a diagram using the vehicle headlamp according to the present embodiment. FIG. 6 (f) is a diagram showing a light intensity distribution of the light distribution pattern shown in FIG. 6 (e).

  As shown in FIG. 6A, the vehicular headlamp 10 according to the present embodiment reflects the light of the LED 28 with a rotating reflector 26 and scans the front with the reflected light to form a substantially rectangular shape. A high-beam light distribution pattern can be formed. 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 synchronizes the turn-on / off timing of the LED 28 and the change in the luminous intensity with the rotation of the rotary reflector 26, so that FIG. As shown in FIG. 6E, a high beam light distribution pattern in which an arbitrary region is shielded 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.

  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.

  Further, as shown in FIGS. 1 and 2, the rotating reflector 26 according to the present embodiment has an LED 28 disposed on the front surface thereof, and also serves as a cooling fan that sends air toward the LED 28. Therefore, it is not necessary to separately provide a cooling fan and a rotating reflector, and the configuration of the optical unit can be simplified. In addition, the LED 28 is air-cooled by the wind generated by the rotary reflector 26, whereby the heat sink for cooling the LED 28 can be omitted or reduced in size, and the optical unit can be reduced in size, cost, and weight. .

  Note that such a cooling fan does not necessarily have a function of directly sending wind toward the light source, and may be one that causes convection in a heat radiating part such as a heat sink. For example, even if the arrangement of the rotary reflector 26 and the heat sink is set so that the LED 28 is cooled by causing convection in the vicinity of a heat radiating part such as a heat sink provided separately from the LED 28 by the wind from the rotary reflector 26. Good. The heat radiating part may be a part of the light source as well as a separate member such as a heat sink.

(Second Embodiment)
In the lamp unit according to the first embodiment, when light is simultaneously incident on both adjacent blades, two irradiation beams appear simultaneously in different directions, so that both ends of the light distribution pattern are simultaneously illuminated. In such a case, it is difficult to independently control the irradiation state at both ends of the light distribution pattern. Therefore, the light source is turned off at a timing at which light is incident on both adjacent blades simultaneously, so that both ends of the light distribution pattern are not irradiated simultaneously. On the other hand, if the light source is temporarily turned off at the above timing, there is a problem that the brightness at both ends of the light distribution pattern is reduced to some extent.

  Therefore, in the rotary reflector according to the second embodiment, a notch is provided between adjacent blades so that light is not incident on both adjacent blades simultaneously.

  FIG. 7 is a perspective view of the rotary reflector 126 according to the second embodiment. The rotating reflector 126 includes a plurality of blades 126a having a reflecting surface that reflects light emitted from the light source while rotating by a predetermined angle to form a desired light distribution pattern in the circumferential direction of the cylindrical rotating portion 126b ( 3 in FIG. 7). The shapes of these blades 126a are configured such that a secondary light source by reflection is formed in the vicinity of the focal point of the convex lens 156 (see FIG. 8), similarly to the blade 26a of the rotary reflector 26 of the first embodiment. Yes. The blade 126a has a twisted shape so that the angle formed by the optical axis Ax and the reflecting surface changes in the circumferential direction about the rotation axis.

  Unlike the first embodiment, a notch 126c is provided at the end of one blade on the side where the two blades 126a are adjacent to each other. The notch 126c is formed so that the light from the light source is incident on the reflective surface of one blade while the vicinity of the boundary between the two adjacent blades 126a is located above the light source. The light from the light source is not incident on the light source and passes through the rotary reflector 126 through the notch 126c. As a result, when light is reflected by the reflecting surface of one adjacent blade, little or no light is reflected by the reflecting surface of the other blade.

  By doing this, the time from which the light from the light source is simultaneously incident on both adjacent blades becomes almost zero, so it is not necessary to turn off the light source or the turn-off time can be shortened accordingly. Reduction in irradiation efficiency can be minimized.

  Considering the path of light rays incident on the reflecting surface, it is preferable to form the circumferential length (L in FIG. 7) of the notch 126c of each blade 126a so as to decrease from the inside to the outside of the blade. .

  FIG. 8 is a top view schematically showing a configuration including the lamp unit 120 according to the second embodiment. The lamp unit 120 can replace the lamp unit 20 according to the first embodiment.

  The lamp unit 120 includes the rotary reflector 126 described above and a semiconductor light emitting element 130 such as an LED as a light source. In the lamp unit 120, the rotating reflector 126 is arranged so that the rotation axis R of the rotating reflector 126 is inclined with respect to the optical axis Ax of the lamp unit 120.

  In FIG. 8, in adjacent blades 126a1 and 126a2, a notch 126c is provided in the front blade 126a2. When the vicinity of the boundary between the adjacent blades 126a1 and 126a2 is positioned above the light emitting element 130, the light from the light emitting element 130 is reflected by the reflection surface of the blade 126a1 on the heel side, and the reflected light enters the convex lens 156 (FIG. 8). Middle light ray A1). On the other hand, in the front blade 126a2, the light from the light emitting element 130 passes through the notch 126c (light ray A2 in FIG. 8), so that it is possible to avoid the simultaneous incidence of light on both adjacent blades. .

  As the circumferential length of the cutout portion 126c increases, the brightness of the end portion of the projected light distribution pattern decreases. Therefore, the cutout portion 126c depends on the allowable reduction in brightness. It is preferable to select the circumferential length.

  You may provide the 2nd light emitting element 132 which functions as a 2nd light source in the position which hits behind the notch 126c of the braid | blade 126a seeing from the front side of a vehicle. The second light emitting element 132 is controlled to light up only while the notch 126c of the blade 126a is positioned in front of the second light emitting element 132 while the rotary reflector 126 is rotating. As a result, the light emitted from the second light emitting element 132 passes through the notch 126c and is directly incident on the convex lens 156 without being reflected by the reflecting surface of the blade 126a (the light beam in FIG. 8). B).

  The light from the second light emitting element 132 can be used for various purposes. For example, when the second light emitting element 132 is disposed in the vicinity of the focal point of the convex lens 156, it is a very short time only while the notch 126c of the blade 126a passes in front of the second light emitting element 132, but the arrangement is different. An optical pattern can be formed. The second light emitting element 132 may be an infrared light emitting element. In this case, infrared light can be used as night vision. Further, instead of the second light emitting element 132, a semiconductor laser or a light source that excites and emits phosphor with the semiconductor laser may be used as the second light source, or a combination of these and the LED may be used as the second light source. .

  You may further provide the 2nd reflector (not shown) which has a reflective surface which reflects the light from the 2nd light emitting element 132 toward the notch part 126c of the blade 126a. Thereby, the utilization efficiency of the light from the 2nd light emitting element 132 can be improved.

  Even if the light from the second light emitting element 132 is reflected by the reflecting surface of the blade 126a, if the light leakage or the like is not a problem, the second light emitting element 132 is always turned on while the rotating reflector 126 is rotating. Also good.

  FIG. 9 is a perspective view of the rotary reflector 226 according to the third embodiment. The rotating reflector 226 can replace the rotating reflector 126 described in FIG. 7 in the lamp unit 120 according to the second embodiment.

  The rotating reflector 226 includes a plurality of blades 226a having a reflecting surface that reflects light emitted from the light source while rotating by a predetermined angle to form a desired light distribution pattern in the circumferential direction of the cylindrical rotating portion 226b ( 3 in FIG. 9). The shape of these blades 226a is configured such that the secondary light source by reflection is formed near the focal point of the convex lens 156 (see FIG. 8), as with the blade 26a of the rotary reflector 26 of the first embodiment. Yes. The blade 226a has a twisted shape so that the angle formed by the optical axis Ax and the reflecting surface changes in the circumferential direction about the rotation axis.

  Unlike the first and second embodiments, at the side where the two blades 226a are adjacent to each other, the end portions of both blades are formed in a curved shape that bends in the same direction, and between the end portions of the blades. A notch 226c larger than the notch 126c in the second embodiment is formed. As in the second embodiment, the notch 226c allows light from the light source to enter the reflecting surface of one blade while the vicinity of the boundary between the two adjacent blades 226a is positioned above the light source. In this case, the light from the light source does not enter the reflecting surface of the other blade and passes through the rotary reflector 226 through the notch 226c. As a result, when light is reflected by the reflecting surface of one adjacent blade, little or no light is reflected by the reflecting surface of the other blade.

  By doing this, the time from which the light from the light source is simultaneously incident on both adjacent blades becomes almost zero, so it is not necessary to turn off the light source or the turn-off time can be shortened accordingly. Reduction in irradiation efficiency can be minimized.

  Considering the path of light rays incident on the reflecting surface, the circumferential length of each notch 226c is preferably formed so as to decrease from the inside toward the outside of the blade.

  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 lamp 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 lamp unit according to the above-described embodiment, the rotating reflector and the light source are turned on and off. Since various light distribution patterns can be formed, a large-scale driving mechanism is unnecessary, and the size can be reduced.

  DESCRIPTION OF SYMBOLS 10 Vehicle headlamp, 120 Lamp unit, 126 Rotating reflector, 126a Blade, 126c Notch, 130 Semiconductor light emitting element, 132 2nd light emitting element, 156 Convex lens.

Claims (8)

A light source;
A rotating reflector that rotates about a rotation axis;
The rotating reflector has a plurality of blades having a reflecting surface for reflecting a light emitted from the light source to form a desired light distribution pattern while rotating by a predetermined angle in the circumferential direction of the rotating shaft,
The blade has a shape that is twisted so that an angle formed by the optical axis and the reflective surface changes as it goes in the circumferential direction about the rotation axis, and the reflective surface of one of the adjacent blades from the light source. A lamp unit, wherein at least a part of one of the blades is cut off so that light from the light source does not enter the reflecting surface of the other adjacent blade when light is incident.   2. The lamp unit according to claim 1, wherein the circumferential length of the cutout portion of the blade decreases from the inside toward the outside of the blade.   The lamp unit according to claim 1, wherein a second light source is provided behind the notch of the blade.   4. The lamp unit according to claim 3, wherein the second light source is lit while the rotary reflector rotates and the notch of the blade is positioned forward. 5.   5. The lamp unit according to claim 3, further comprising a second reflector having a reflection surface that reflects light from the second light source toward the notch of the blade.   6. The lamp unit according to claim 3, wherein the second light source is an infrared light source.   6. The lamp unit according to claim 3, wherein the second light source is a semiconductor laser light source or a light source that excites a phosphor with a semiconductor laser.   A vehicular lamp using the lamp unit according to claim 1.