JP2012043656A - Headlight for vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a compact headlight for a vehicle capable of displacing a shading region formed in a light distribution pattern while securing distant place visibility by a high beam.SOLUTION: A movable shade mechanism 15 is provided with a rotating shade 20 which is placed further backward than a rear side focal point F of a projection lens 8 crossing an optical axis Ax and along a perpendicular axis line Vx extending in a vertical direction and is composed of a rotation axis member enabled to rotate around the perpendicular axis line Vx and of which a horizontal cross-section of a tip side outer circumferential face part 20A projecting frontward than the rear side focal point of the projection lens 8 in a shielding position is of an almost semicircular shape, and of which a base end side outer circumferential portion 20B extending from the tip side outer circumferential portion 20A to the perpendicular axis line Vx is constructed to be narrower in the horizontal cross-sectional width than the tip side outer circumferential portion 20A, and a rotation motor 30 which rotates the rotation shade 20 to displace in a horizontal direction the shading region of a light distribution pattern projected frontward of the vehicle.

Description

  The present invention relates to a vehicle headlamp, and in particular, a projector-type vehicle headlamp having a variable light distribution function capable of changing the light distribution of the headlamp according to the presence or absence of a preceding vehicle or an oncoming vehicle. About.

  Conventionally, light from a light source disposed on an optical axis extending in the vehicle longitudinal direction is condensed and reflected toward the front by a reflector toward the front of the optical axis, and this reflected light is passed through a projection lens provided in front of the reflector. There is known a vehicular headlamp including a projector-type lamp unit configured to irradiate the front of the lamp.

  When such a projector-type lamp unit is used, a shade capable of shielding a part of the reflected light from the reflector is provided between the projection lens and the reflector, for example, a required light distribution such as a passing light distribution pattern. By blocking unnecessary portions according to the pattern, a cut-off line can be formed at the upper end of the desired light distribution pattern.

  Further, for example, in Patent Document 1 and the like, the light source unit irradiates the left side of the vehicle with the light emitted from the first LED (semiconductor light emitting element) to form the left side irradiation pattern (reflector), and the second LED. A second reflector that irradiates the right side of the vehicle with light emitted from the vehicle to form a right illumination pattern, and a third reflector that irradiates with light emitted from the third LED to form a central illumination pattern. Vehicle lamps have been proposed.

  According to such a vehicular lamp, the control unit can be provided with a variable light distribution function by selectively turning on / off the left irradiation pattern, the right irradiation pattern, and the central irradiation pattern. Therefore, for example, when there is a preceding vehicle, the detection device detects the preceding vehicle, and the control unit turns off the third LED and controls the lighting of the first LED and the second LED according to the detection result. Thereby, the glare with respect to a preceding vehicle can be prevented, ensuring a far vision with a high beam.

JP 2007-179969 A

  However, in the configuration of the variable light distribution function provided in the vehicular lamp disclosed in Patent Document 1 and the like, three reflections facing in different directions to form the left side illumination pattern, the right side illumination pattern, and the center illumination pattern, respectively. Part is required. Therefore, there has been a problem that the vehicular lamp is increased in size.

  In addition, for example, a light shielding region formed by turning off the third LED that forms the central irradiation pattern in order to prevent glare of the preceding vehicle cannot displace the light shielding position. Therefore, in order to form an optimal light distribution pattern according to the relative position between the oncoming vehicle and the host vehicle, it is necessary to increase the number of light sources and reflection parts so that a large number of irradiation patterns can be formed. There was a problem of causing an increase in size.

  Accordingly, an object of the present invention is to solve the above-mentioned problems, and to provide a compact vehicular headlamp capable of displacing a light shielding area formed in a light distribution pattern while securing a far field of view by a high beam. It is.

An object of the present invention is to provide a projection lens disposed on an optical axis extending in the vehicle front-rear direction in a lamp chamber formed by a lamp body and a cover, a light source disposed on the rear side of the projection lens, and the light source. A reflector that reflects the light from the front toward the optical axis, a part of the reflected light from the reflector disposed between the projection lens and the light source, and a part of the direct light from the light source A vehicular headlamp comprising a movable shade mechanism capable of switching between a shielding state and a non-shielding state for shielding
The movable shade mechanism is
From a rotary shaft member that is arranged along a vertical axis that intersects the optical axis and extends in the vertical direction behind the focal point on the rear side of the projection lens, and that is configured to be rotatable about the vertical axis. And a base end side outer peripheral surface portion extending from the front end side outer peripheral surface portion protruding forward from the rear focal point of the projection lens to the vertical axis at the shielding position is narrowed with a narrower horizontal cross-sectional width than the front end side outer peripheral surface portion. A rotating shade,
An actuator that horizontally displaces the light shielding area of the light distribution pattern projected to the front of the vehicle by rotating the rotation shade;
It is achieved by a vehicle headlamp characterized by comprising:

According to the vehicle headlamp having the above-described configuration, the rotating shade arranged along the vertical axis shields a part of the reflected light from the reflector and a part of the direct light from the light source, thereby distributing the light. A light shielding region can be formed in the approximate center of the pattern (shielded state).
Further, by rotating the rotation shade at the shielding position, the distal end side outer peripheral surface portion protruding forward from the rear focal point of the projection lens moves in the horizontal direction. Therefore, the light shielding area of the light distribution pattern projected in front of the vehicle can be displaced in the horizontal direction.

  In addition, the base end side outer peripheral surface portion of the rotary shade is narrowed with a horizontal cross-sectional width narrower than the distal end side outer peripheral surface portion. Therefore, when the rotation shade is reversed to the non-shielding position, the base end side outer peripheral surface part located near the rear focal point of the projection lens may shield part of the light incident on the projection lens. No (unshielded state).

In the vehicle headlamp configured as described above, it is desirable that the outer peripheral surface portion of the distal end side of the rotating shade has a substantially semicircular horizontal cross section.
According to the vehicle headlamp having such a configuration, a change in the width of the light shielding region that is displaced in the horizontal direction can be minimized.

Also, a pair of the light sources arranged in the vehicle width direction across the optical axis, and light from each of the light sources is reflected toward the optical axis toward the front, whereby left and right single high beam light distribution It is desirable to include a pair of reflectors that form a pattern.
According to the vehicular headlamp having such a configuration, a light distribution pattern for one high beam can be easily obtained by controlling the lighting of the pair of light sources.

Further, in the vehicle headlamp configured as described above, a fixed light-shielding plate is provided at the boundary between the pair of reflectors so as to shield a gap from the distal-side outer peripheral surface portion of the rotating shade at the non-shielding position. Is desirable.
According to the vehicle headlamp having such a configuration, when the light distribution pattern for one high beam is formed, leakage light from the gap between the reflector and the rotating shade at the non-shielding position is projected onto the light shielding region. Can be prevented.

According to the vehicle headlamp of the present invention described above, it is possible to form a light-shielding region at the substantially central portion of the light distribution pattern without using a large number of three or more light sources and reflectors, and the light-shielding region. Can be displaced.
Therefore, it is possible to provide a compact vehicular headlamp that can displace the light shielding area formed in the light distribution pattern while securing the far field of view by the high beam.

It is a schematic longitudinal cross-sectional view of the vehicle headlamp which concerns on one Embodiment of this invention. It is a schematic perspective view of the lamp unit in the vehicle headlamp of FIG. It is a top view of the rotation shade shown in FIG. FIG. 3 is a horizontal cross-sectional view of a main part for explaining a state in which a rotation shade in the lamp unit shown in FIG. 2 shields a substantially central portion in a vehicle width direction in a high beam light distribution pattern. FIG. 3 is a horizontal cross-sectional view of a main part for explaining a state in which a rotating shade in the lamp unit shown in FIG. 2 generates a high beam light distribution pattern. It is a figure which shows perspectively the example of the light distribution pattern formed on the virtual vertical screen arrange | positioned in the position of 25 m ahead of a lamp | ramp by the light irradiated ahead from a vehicle headlamp, (a) is for normal high beams (B) shows a light distribution pattern for follow-up high beam, (c) shows a light distribution pattern for opposed high beam, and (d) shows a light distribution pattern for one side opposed high beam.

Hereinafter, a vehicle headlamp according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.
As shown in FIG. 1, a vehicular headlamp 1 according to the present embodiment has a lamp unit 5 housed in a lamp chamber 4 defined by a transparent transparent cover (cover) 2 and a lamp body 3. ing.

  As shown in FIGS. 1 and 2, the lamp unit 5 is a projector-type high beam lamp unit, and includes a projection lens 8 disposed on an optical axis Ax extending in the vehicle front-rear direction, and a rear focal point of the projection lens 8. A pair of left and right semiconductor light emitting elements (light sources) 10L and 10R arranged behind F, and a pair of left and right reflectors 13L that reflect light from the respective semiconductor light emitting elements 10L and 10R toward the optical axis Ax toward the front. 13R, a shielding state that is arranged between the projection lens 8 and the semiconductor light emitting elements 10L and 10R and shields part of the reflected light from the reflectors 13L and 13R and part of the direct light from the semiconductor light emitting elements 10L and 10R. And a movable shade mechanism 15 capable of switching between a non-shielding state.

  The lamp unit 5 is attached to the upper and lower support bases 11 a and 11 b of the support frame 11. The support frame 11 is supported by the lamp body 3 via an aiming mechanism 6 including an aiming screw 6a and an aiming nut 6b. The aiming mechanism 6 is a mechanism for finely adjusting the mounting position and the mounting angle of the lamp unit 5 by adjusting the tightening by the aiming nut 6b. At the stage of adjusting the aiming, the optical axis Ax of the lamp unit 5 is It extends in a direction substantially horizontal to the direction. Radiating fins 18 project from the rear surface of the support frame 11 to radiate heat generated in the semiconductor light emitting elements 10L and 10R.

  The projection lens 8 is a plano-convex lens having a convex front surface and a flat rear surface, and projects an image on the focal plane including the rear focus F forward as a reverse image.

  In the present embodiment, the semiconductor light emitting elements 10L and 10R are white diodes each having a light emitting unit 10a. The pair of semiconductor light emitting elements 10L and 10R are arranged on the left and right sides in the vehicle width direction with the optical axis Ax interposed therebetween, and the irradiation axes LxR and LxL are arranged so as to face the optical axis Ax side and face each other. More precisely, the semiconductor light emitting elements 10L and 10R are in a state of being slightly inclined toward the rear of the vehicle so that their irradiation axes LxR and LxL face the reflecting surfaces 13La and 13Ra of the reflectors 13L and 13R, respectively, from the state of facing each other. 7 (see FIGS. 4 and 5). The semiconductor light emitting elements 10L and 10R are controlled to be lighted independently by a lighting control device (not shown).

  As shown in FIGS. 2 and 4, the reflectors 13L and 13R according to the present embodiment have a pair of left and right reflecting surfaces 13La and 13Ra with the optical axis Ax as the center, and are connected and integrated with each other. is there. The reflecting surfaces 13La and 13Ra are substantially elliptical spherical reflecting surfaces formed on a part of the reflector body 7 made of an aluminum alloy, a resin, or the like by aluminum vapor deposition.

  The reflecting surfaces 13La and 13Ra are set to have a substantially elliptical shape in which the horizontal cross-sectional shape is the first focal point (F1) at the center position of the light emitting unit 10a and the second focal point is the vicinity of the rear focal point F of the projection lens 8. And arranged so as to face the left and right semiconductor light emitting elements 10L, 10R. Accordingly, the reflecting surfaces 13La and 13Ra are configured to condense and reflect the light from the light emitting unit 10a toward the front toward the optical axis Ax. Further, the eccentricity of the reflecting surfaces 13La and 13Ra is set so as to gradually increase from the vertical cross section toward the horizontal cross section.

  As shown in FIGS. 1 to 5, the movable shade mechanism 15 of the present embodiment is disposed along a vertical axis Vx extending in the vertical direction and intersecting the optical axis Ax behind the rear focal point F of the projection lens 8. In addition, the gap between the rotary shade 20 composed of the rotary shaft member configured to be rotatable around the vertical axis Vx and the reflector 13L, 13R is shielded from light. A fixed light shielding plate 12 and a rotation motor 30 as an actuator for rotating the rotation shade 20 are provided.

  The fixed light shielding plate 12 is disposed so as to extend along the optical axis Ax from the boundary between the reflectors 13L and 13R to the front side outer peripheral surface portion 20A of the rotary shade 20 at the non-shielding position shown in FIG. This is a light shielding member. The fixed light shielding plate 12 prevents light leaking from the gap between the reflectors 13L and 13R and the rotating shade 20 at the non-shielding position from being projected onto the light shielding region when the one-high beam light distribution pattern is formed.

  The rotation shade 20 of the present embodiment is composed of a metal column member having a substantially water droplet shape in a horizontal cross section having support shafts 21a and 21b arranged on a vertical axis Vx at both ends. A support shaft 21 a protruding from the lower end side of the rotary shade 20 is connected to the motor shaft 30 a of the rotary motor 30.

  3 and 4, the rotary shade 20 has a substantially semicircular horizontal cross section of the distal outer peripheral surface portion 20A that projects forward from the rear focal point F of the projection lens 8 at the shielding position shown in FIGS. The proximal-side outer peripheral surface portion 20B extending from the outer peripheral surface portion 20A to the vertical axis Vx has a narrowed shape having a horizontal cross-sectional width narrower than the width w of the distal-end outer peripheral surface portion 20A (in this embodiment, a triangular horizontal cross-sectional shape). ing. Further, a notch 20C for preventing interference with the reflectors 13L and 13R at the non-shielding position shown in FIG. 5 is formed below the distal end side outer peripheral surface portion 20A (see FIG. 2).

Further, parallel portions 20D are formed on both sides of the portion behind the rear focal point F that connects the distal outer peripheral surface portion 20A and the proximal outer peripheral surface portion 20B. And the outer peripheral surface whole periphery of these front end side outer peripheral surface parts 20A, base end side outer peripheral surface part 20B, and parallel part 20D is made into a reflective surface by performing aluminum vapor deposition.
Therefore, when the rotary shade 20 is in the shielding position, the parallel portions 20D reflect the direct light portions D1 and D2 from the semiconductor light emitting elements 10L and 10R toward the incident surface (rear side surface) of the projection lens 8. Since it can be projected forward, the light utilization rate can be increased and the light quantity of the irradiation pattern can be improved (see FIG. 4).

The actuator of the present embodiment includes a rotary motor 30 such as a step motor, and rotationally drives the rotary shade 20 via a support shaft 21a connected to the motor shaft 30a.
The rotary motor 30 is driven and controlled by a control unit (not shown) in accordance with the vehicle running condition or the beam changeover switch operation.

In the shielding position shown in FIG. 4, the rotary shade 20 that is located on the optical axis Ax and whose front end side outer peripheral surface portion 20A having a width w protrudes forward from the rear focal point F of the projection lens 8 is the semiconductor light emitting element 10L. , 10R is shielded to form a light-shielding region C1 at a substantially central portion of the normal high-beam light distribution pattern PH (see FIGS. 6A and 6B).
At this time, a part of the direct light D1 and D2 from the semiconductor light emitting elements 10L and 10R is reflected toward the incident surface of the projection lens 8 by the parallel portion 20D of the rotary shade 20 and projected forward. The light quantity of the pattern is improved.

  And the tip which protrudes ahead from the back side focus F of the projection lens 8 by rotating the rotation shade 20 continuously in the angle range of about 30 degree | times to the left-right direction centering | focusing on the optical axis Ax. The side outer peripheral surface portion 20A moves in the horizontal direction. Therefore, as shown in FIG. 6C, the light shielding region C1 of the normal high beam light distribution pattern PH projected in front of the vehicle can be displaced in the horizontal direction.

The outer peripheral surface portion 20A on the front end side of the rotary shade 20 has a substantially semicircular shape in which the radius r1 of the horizontal section is larger in curvature than the rotary radius R1 of the rotary shade 20, and the center of the radius r1 is the rear side. It is behind the focal point F. Therefore, it is possible to minimize the change in the left-right width of the light-shielding region C1 that is displaced in the horizontal direction as the rotation shade 20 rotates.
Further, in the case of the rotation shade 20 according to the present embodiment, when the rotation shade 20 is rotated within an angle range larger than about 30 degrees, the position of the light shielding region C1 does not change and the light distribution pattern is disturbed. do not do. However, as a matter of course, it is possible to use the rotating shade by rotating it within an angle range larger than about 30 degrees by appropriately changing the shapes of the rotating shade, the reflector and the like.

  Next, when the rotary motor 30 reverses the rotation shade 20 to the non-shielding position shown in FIG. 5, the distal end side outer peripheral surface portion 20 </ b> A moves rearward away from the rear focal point F of the projection lens 8. The end side outer peripheral surface portion 20B moves to the vicinity of the rear side of the rear side focal point F. That is, the rotary shade 20 moves to a non-shielding position where the reflected light from the reflectors 13L and 13R toward the incident surface of the projection lens 8 and the direct light from the semiconductor light emitting elements 10L and 10R are not shielded.

  Furthermore, the base end side outer peripheral surface portion 20B of the rotary shade 20 has a triangular horizontal cross-sectional shape in which the horizontal cross-sectional width narrows toward the vertical axis Vx. Therefore, the proximal end outer peripheral surface portion 20B located in the vicinity of the rear side of the rear side focal point F does not interfere with a part of the reflected light from the reflectors 13L and 13R and shield it.

FIG. 6A is a perspective view showing an example of a light distribution pattern formed on a virtual vertical screen disposed at a position 25 m ahead of the lamp by the light irradiated forward from the vehicle headlamp 1 at this time. FIG.
As shown in the drawing, this light distribution pattern includes the left high beam light distribution pattern PHL by the light B1 from the right semiconductor light emitting element 10R and the right high beam light distribution pattern PHR by the light B2 from the left semiconductor light emitting element 10L. Is a normal high beam light distribution pattern PH.

  That is, in the case of the present embodiment, the normal high beam light distribution pattern PH lights the left and right semiconductor light emitting elements 10L and 10R, and reflects light from the reflectors 13L and 13R and direct light from the semiconductor light emitting elements 10L and 10R. The front-end-side outer peripheral surface portion 20A of the rotary shade 20 can be formed on the rear side away from the rear-side focal point F of the projection lens 8 so as not to shield.

  When the rotary motor 30 reverses the rotation shade 20 to the shielding position shown in FIG. 4, the distal end side outer peripheral surface portion 20 </ b> A protrudes forward from the rear focal point F of the projection lens 8. Therefore, since the rotary shade 20 positioned on the optical axis Ax shields part of the light E1 and E2 from the semiconductor light emitting elements 10L and 10R, the normal high beam light distribution pattern PH projected forward from the projection lens 8 is used. The substantially central portion in the vehicle width direction will be removed.

FIG. 6B is a perspective view showing an example of a light distribution pattern formed on a virtual vertical screen arranged at a position 25 m ahead of the lamp by the light irradiated forward from the vehicle headlamp 1 at this time. FIG.
As shown in the figure, this light distribution pattern is synthesized by the left high beam light distribution pattern PHL by the light B1 from the semiconductor light emitting element 10R and the right high beam light distribution pattern PHR by the light B2 from the semiconductor light emitting element 10L. The high beam light distribution pattern is a follow-up high beam light distribution pattern PHM in which a light shielding region C1 is formed at a substantially central portion above the HH line. According to this follow-up high beam light distribution pattern PHM, the visibility of the host vehicle can be improved without giving glare to the preceding vehicle traveling in the center in front of the vehicle.

  Further, as indicated by an imaginary line in FIG. 4, the rotary motor 30 so that the front end side outer peripheral surface portion 20 </ b> A protruding forward from the rear focal point F of the projection lens 8 rotates about 30 degrees to the right from the optical axis Ax. When the rotation control is performed, the light shielding region C1 of the follow-up high beam light distribution pattern PHM projected forward of the vehicle is displaced to the left, and the left-side central portion in the vehicle width direction is removed.

FIG. 6C is a perspective view showing an example of a light distribution pattern formed on a virtual vertical screen disposed at a position 25 m ahead of the lamp by the light irradiated forward from the vehicle headlamp 1 at this time. FIG.
As shown in the figure, this light distribution pattern is synthesized by the left high beam light distribution pattern PHL by the light B1 from the semiconductor light emitting element 10R and the right high beam light distribution pattern PHR by the light B2 from the semiconductor light emitting element 10L. The high-beam light distribution pattern is a counter-high-beam light distribution pattern PHN in which a light-shielding region C1 is formed in the left central part above the HH line. According to the opposed high beam light distribution pattern PHN, the light shielding region C1 is formed on the left side of the follow high beam distribution pattern PHM, so that glare is not imparted to the oncoming vehicle traveling on the left side in front of the vehicle. The visibility of the own vehicle can be improved.

  Furthermore, the vehicle headlamp 1 according to the present embodiment includes a pair of semiconductor light emitting elements 10L and 10R arranged in the vehicle width direction with the optical axis Ax interposed therebetween, and lights B1 and B2 from the semiconductor light emitting elements 10L and 10R. And a pair of left and right reflectors 13L and 13R that reflect toward the front toward the optical axis Ax. Therefore, the light distribution pattern for one high beam can be easily obtained by controlling the lighting of the pair of semiconductor light emitting elements 10L and 10R.

  That is, after the rotation control of the rotary motor 30 is performed so that the distal end side outer peripheral surface portion 20A protruding forward from the rear focal point F of the projection lens 8 rotates about 30 degrees to the right from the optical axis Ax, The semiconductor light emitting element 10R is turned off and only the left semiconductor light emitting element 10L is turned on. Then, a part of the light B2 from the semiconductor light emitting element 10L is shielded, and the left portion in the vehicle width direction of the one-high beam light distribution pattern projected forward from the projection lens 8 is removed.

FIG. 6D is a perspective view showing an example of a light distribution pattern formed on a virtual vertical screen arranged at a position 25 m ahead of the lamp by the light irradiated forward from the vehicle headlamp 1 at this time. FIG.
As shown in the figure, this light distribution pattern is a one-side opposed high beam in which a light shielding region C1 is formed on the left side above the HH line in the right high beam light distribution pattern PHR by the light B2 from the semiconductor light emitting element 10L. This is a light distribution pattern PHR. According to this one-side opposed high beam light distribution pattern PHR, the visibility of the host vehicle can be improved without giving glare to the oncoming vehicle passing the left side in front of the vehicle.

  Thus, according to the vehicle headlamp 1 of the present embodiment, the rotation motor 30 is driven and controlled by a control unit (not shown) according to the presence or absence of a preceding vehicle or an oncoming vehicle, and the rotation shade 20 is controlled in the vehicle running state. Accordingly, the distal end side outer peripheral surface portion 20A protruding forward from the rear focal point F of the projection lens 8 can be moved in the horizontal direction. Therefore, the light shielding area C1 of the light distribution pattern projected in front of the vehicle by light irradiation from the lamp unit 5 can be displaced in the horizontal direction, and optimal visibility according to the traveling state can be obtained.

  Therefore, the vehicular headlamp 1 according to the present embodiment can form a light-shielding region at a substantially central portion of the light distribution pattern without using, for example, a large number of three or more light sources and reflectors. Can be displaced. Therefore, it is possible to provide a compact vehicular headlamp 1 that can displace a light shielding region formed in a light distribution pattern while securing a far field of view with a high beam.

The specific configurations of the projection lens, the light source, the reflector, the movable shade mechanism, the rotating shade, the distal end side outer peripheral surface portion, the proximal end outer peripheral surface portion, and the actuator in the above embodiment are also limited to the above embodiment. However, it goes without saying that various modifications are possible based on the gist of the present invention.
For example, in the above embodiment, an example in which a semiconductor light emitting element is used as a light source has been described, but a light source bulb such as a discharge bulb or a halogen bulb may be used. Moreover, a solenoid and a gear mechanism can also be used as an actuator for rotating the rotation shade.

In the above embodiment, the base end side outer peripheral surface portion has a triangular horizontal cross-sectional shape, but the base end side outer peripheral surface portion according to the present invention has a narrowed shape with a horizontal cross-sectional width narrower than the width of the front end side outer peripheral surface portion. Needless to say, various shapes can be adopted.
The vehicle headlamp 1 according to the embodiment includes a pair of semiconductor light emitting elements 10L and 10R arranged in the vehicle width direction with the optical axis Ax interposed therebetween, and a pair of reflectors 13L and 13R. However, it may be composed of a single light source and reflector.

1 Vehicle headlamp 2 Transparent cover (cover)
3 Lamp body 4 Lamp chamber 5 Lamp unit 8 Projection lens 10L, 10R Semiconductor light emitting element (light source)
DESCRIPTION OF SYMBOLS 10a Light emission part 12 Fixed light-shielding plate 13L, 13R Reflector 13La, 13Ra Reflective surface 15 Movable shade mechanism 20 Rotating shade 20A Front end side outer peripheral surface part 20B Base end side outer peripheral surface part 20C Notch part 20D Parallel part 21a, 21b Support shaft 30 Rotating motor (actuator)
Ax Optical axis Vx Vertical axis

Claims (4)

In a lamp chamber formed by a lamp body and a cover, a projection lens disposed on an optical axis extending in the vehicle front-rear direction, a light source disposed on the rear side of the projection lens, and light from the light source directed forward A reflector that reflects near the optical axis, and a shielding state that is disposed between the projection lens and the light source and shields part of the reflected light from the reflector and part of the direct light from the light source. A vehicle headlamp comprising a movable shade mechanism capable of switching between a shielding state,
The movable shade mechanism is
From a rotary shaft member that is arranged along a vertical axis that intersects the optical axis and extends in the vertical direction behind the focal point on the rear side of the projection lens, and that is configured to be rotatable about the vertical axis. And a base end side outer peripheral surface portion extending from the front end side outer peripheral surface portion protruding forward from the rear focal point of the projection lens to the vertical axis at the shielding position is narrowed with a narrower horizontal cross-sectional width than the front end side outer peripheral surface portion. A rotating shade,
An actuator for horizontally displacing a light-shielding region of a light distribution pattern projected to the front of the vehicle by rotating the rotation shade;
A vehicle headlamp characterized by comprising:   2. The vehicle headlamp according to claim 1, wherein the tip-side outer peripheral surface portion of the rotating shade has a substantially semicircular horizontal cross section.   A pair of the light sources arranged in the vehicle width direction across the optical axis, and light from each of the light sources is reflected toward the optical axis toward the front, whereby left and right single high beam light distribution patterns are respectively obtained. The vehicle headlamp according to claim 1, further comprising a pair of reflectors to be formed.   The fixed light-shielding plate which shields the clearance gap between the front-end | tip side outer peripheral surface part of the said rotation shade in the non-shielding position is provided in the boundary of a pair of said reflector. The vehicle headlamp according to item 1.

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