JP4547571B2 - Vehicle headlamp and light-shielding shutter driving device - Google Patents

Description

  The present invention relates to a projector-type vehicle headlamp used as, for example, a headlamp or an auxiliary headlamp provided at the front of an automobile, and a light-shielding shutter driving device used therefor.

  Conventionally, such a vehicle headlamp is configured, for example, as shown in FIG. That is, in FIG. 5, the vehicle headlamp 1 includes a bulb 2 as a light source, a reflection surface 3, a projection lens 4, and a light shielding shutter 5.

The reflective surface 3 is composed of an elliptical reflective surface having the bulb 2 as the first focal point (rear focal point) and the major axis extending substantially horizontally toward the front, and its inner surface is formed as a reflective surface. Yes.
Here, the elliptical reflecting surface includes not only a spheroid and an elliptic cylinder but also a free-form surface based on an ellipsoid.

The projection lens 4 is composed of a convex lens, and the focal point on the light source side (rear side) is arranged in the vicinity of the second focal position of the reflecting surface 3.
Thereby, the projection lens 4 collects light traveling forward from the bulb 2 or the reflecting surface 3 and irradiates it forward.

  The light-shielding shutter 5 is for giving a predetermined light distribution pattern for a low-pass beam to the light emitted toward the front, and is disposed in the vicinity of the second focal position of the reflective surface 3. In addition, in order to form a cut-off line in the light distribution pattern, the upper edge 5a is formed in a predetermined shape.

According to the vehicle headlamp 1 having such a configuration, when the bulb 2 is supplied with power and emits light, the light emitted from the bulb 2 is reflected directly or by the reflection surface 3, and the reflection surface 3. The light travels forward toward the vicinity of the second focal point, and is irradiated forward while being focused by the projection lens 4.
At that time, a part of the light irradiated forward is blocked by the light-shielding shutter 5, and a cut-off line is formed by the upper edge 5 a of the light-shielding shutter 5, and is emitted forward as a passing beam. Will be.

  As a result, the cut-off line is projected by the projection lens 5, and the light distribution pattern is, for example, horizontal from the center to the right side slightly below the horizontal line and horizontally from the center to the left side along the horizontal line. A cut-off line extending in a straight line is formed, and only light below the cut-off line is irradiated with light suitable for the low beam.

  In this way, in such a vehicle headlamp 1, in the case of a passing beam, a cut-off line is formed by the light shielding shutter 5, thereby forming a light distribution pattern for the passing beam.

  Further, according to Patent Document 1, for example, the light shielding shutter 5 is rotationally driven by an electromagnetic actuator as a whole. Thereby, the light-shielding shutter 5 is retracted from the optical path from the bulb 2 and the reflecting surface 3 to the projection lens 4 so that a light distribution pattern for a traveling beam is formed.

By the way, in the vehicle headlamp 1 described above, the light distribution pattern for the passing beam by the cut-off line is always constant.
On the other hand, in Patent Document 2, in order to improve the visibility by the passing beam as much as possible according to the situation around the vehicle when using the passing beam, the state around the vehicle is detected, and the vertical direction of the light-shielding shutter is detected. A vehicle headlamp is disclosed in which the top dead center position of the light-shielding shutter is changed in the vertical direction when a so-called light curtain phenomenon such as fog is likely to occur.
JP 2001-143505 A Japanese Patent No. 2861737

However, in the vehicle headlamp according to Patent Document 1, the entire light shielding shutter 5 is moved by a rotary electromagnetic actuator.
For this reason, since the position of the light-shielding shutter 5 changes according to the rotation angle of the rotating shaft of the electromagnetic actuator, a stopper for regulating the stop position is necessary.
Therefore, the number of parts is large, the configuration becomes complicated, and the assembly work becomes complicated.

Further, since the light shielding shutter 5 is disposed in the vicinity of the electromagnetic actuator, a space for arranging the electromagnetic actuator laterally in the vicinity of the light shielding shutter 5 between the light shielding shutter 5 and the reflecting surface 3, and the light shielding. A space for swinging the entire shutter 5 is required.
Thereby, the freedom degree of design of a vehicle headlamp will become small.

Furthermore, in the vehicle headlamp according to Patent Document 2, a cut-off line is formed by the upper edge of a substantially cylindrical shade (light-shielding shutter) having a cam shape in cross section, and the shade is rotated by a motor. The cut-off line is moved in the vertical direction by changing the height position of the upper edge of the shade based on the cross-sectional cam shape.
Therefore, in this case as well, the cut-off line, that is, the height position of the upper edge of the shade is determined based on the rotation angle of the shade, but the upper edge of the shade has a curvature in the front-rear direction. Therefore, it becomes impossible to form a sharp cut-off line.
In this case as well, a space for a motor for rotationally driving the substantially cylindrical shade is required, and the degree of freedom in designing the vehicle headlamp is reduced.

  In view of the above, the present invention can easily change the position of a light-shielding shutter in a projector-type vehicle headlamp while maintaining a large degree of freedom in designing a vehicle headlamp with a simple configuration. It is an object of the present invention to provide a driving device for a vehicle headlamp and a light shielding shutter.

  According to the first configuration of the present invention, the object is to include at least the upper edge of the plate-shaped light shielding shutter in which the upper edge is arranged near the light source side focal position of the projection lens in the projector type vehicle headlamp. A light-shielding shutter drive device that swings a part (movable part) around a horizontal axis, and a crankshaft rotatably supported around a vertical axis, and a first extending vertically from one end of the crankshaft A linear motion actuator having a drive shaft that engages with the tip of one arm, and the tip of the second arm of the crankshaft of the drive device moves up and down from the horizontal axis of the movable part of the light shielding shutter. This is achieved by a light-shielding shutter driving device characterized by being engaged at a position shifted in the distance.

  In the light-shielding shutter drive device according to the present invention, preferably, the drive shaft of the linear motion actuator is arranged in parallel to the optical axis of the projection lens.

  In the light-shielding shutter drive device according to the present invention, preferably, the drive shaft of the linear motion actuator is arranged perpendicular to the optical axis of the projection lens.

  In the light-shielding shutter driving device according to the present invention, preferably, the direct acting actuator is a solenoid.

  In the light-shielding shutter driving device according to the present invention, preferably, the length of each arm of the crankshaft is selected according to the moving distance of the driving shaft and the moving distance of the light-shielding shutter.

  In addition, according to the second configuration of the present invention, the first object is located near the light source so that the light from the light source and the light from the light source are reflected forward, and the second On the optical axis of the light source, in front of the reflecting surface, an elliptical reflecting surface that is concave toward the front and positioned so that the focal position is positioned on the optical axis of the light source that extends substantially horizontally forward. A convex projection lens disposed so that the focal position on the light source side is located near the second focal position of the reflecting surface, and the upper edge is disposed near the second focal position of the reflecting surface. A plate-shaped light shielding shutter formed so as to define a cut-off line, and at least a part (movable part) including the upper edge of the light shielding shutter extends horizontally with respect to the optical axis. The movable part of the shading shutter is supported so as to be swingable around A vehicle headlamp comprising a drive device that swings forward or rearward, wherein the drive device is the light-shielding shutter drive device described above. Is done.

  According to the above configuration, the light emitted from the light source of the vehicle headlamp is reflected directly or by the reflecting surface, converged toward the second focal position, and further forward through the projection lens. Irradiated.

At this time, the movable part of the light shielding shutter is inserted into the optical path by the light shielding shutter driving device. As a result, the upper edge of the light shielding shutter is brought near the focal position on the light source side of the projection lens.
Accordingly, a part of the irradiation light irradiated forward from the light source or the reflection surface is blocked by the light shielding shutter, and the upper edge of the light shielding shutter is projected forward. Thereby, a cut-off line in the light distribution pattern is formed.
In this way, an optimal light distribution pattern can be obtained for a passing beam that does not dazzle oncoming vehicles and pedestrians.

  At this time, when the movable part of the light shielding shutter is inserted into the light path from the light source or the reflecting surface to the projection lens, the entire light shielding shutter is formed in a plate shape, that is, relatively thin in the optical axis direction. An offline will be formed.

On the other hand, when the movable part of the light shielding shutter is retracted from the optical path by the light shielding shutter driving device, the irradiation light irradiated toward the front is not blocked by the light shielding shutter and is all irradiated toward the front.
Thereby, the cut-off line by the upper edge of the light shielding shutter is not formed in the light distribution pattern, and the optimum light distribution pattern for the traveling beam is obtained.

Further, the movable part of the light shielding shutter is retracted from the optical path by the light shielding shutter driving device, and the part (fixed part) excluding the movable part of the light shielding shutter partially blocks the optical path to the projection lens. In this case, the cut-off line formed by the upper edge of the fixed part of the light shielding shutter moves slightly upward compared to the cut-off line by the upper edge of the movable part.
Thereby, light is irradiated also in a higher angular direction. Therefore, when the distant visibility is improved, for example, a light distribution pattern suitable for traveling on an expressway can be obtained.

In this case, the light-shielding shutter driving device for moving the movable part of the light-shielding shutter in the vertical direction is composed of a direct acting actuator and a crankshaft. Therefore, even if the direct acting actuator is arranged parallel to the optical axis of the projection lens, or arranged perpendicularly to the optical axis, that is, horizontally, the direction in which the two arms of the crankshaft extend is appropriately selected. Thus, the movable part of the light shielding shutter can be swung in the front-rear direction.
Further, since the movement of the direct acting actuator drive shaft is transmitted to the movable part of the light shielding shutter via the crankshaft, the direct acting actuator can be arranged at a position relatively away from the light shielding shutter.
Accordingly, the degree of freedom of arrangement of the direct acting actuator and the degree of freedom of designing the vehicle headlamp are increased, and any vehicle headlamp design is possible.

  When the drive shaft of the direct acting actuator is arranged in parallel to the optical axis of the projection lens, the lateral length of the direct acting actuator is reduced, so that the vehicle headlamp is small in the lateral direction. Can be done.

  When the drive shaft of the linear motion actuator is arranged perpendicular to the optical axis of the projection lens, the linear motion actuator has a shorter length in the optical axis direction. Can be made compact in the optical axis direction.

  When the direct acting actuator is a solenoid, the light shielding shutter driving device can be configured relatively easily and at low cost.

When the length of each arm of the crankshaft is selected according to the moving distance of the drive shaft and the moving distance of the movable part of the light shielding shutter, it is necessary to swing the movable part of the light shielding shutter. There is no need to select the movement distance of the drive shaft of the direct acting actuator with respect to the movement distance. Further, in this case, by using a direct acting actuator having a drive shaft with an arbitrary moving distance and appropriately selecting the length of each arm of the crankshaft, the movable part of the light shielding shutter is moved to a desired moving distance. It is possible to drive only.
Therefore, the light-shielding shutter driving device can be configured easily and at low cost by using an easily available or low-priced direct acting actuator.

In this way, according to the present invention, a linear actuator is used as a drive source of a drive device for moving the movable part of the light shielding shutter, and a crankshaft is used as a transmission mechanism. In addition, the desired movement of the movable part of the light shielding shutter can be realized at low cost.
At this time, the movement of the drive shaft of the direct acting actuator is transmitted to the movable portion of the light shielding shutter via the crankshaft, so that the movable portion of the light shielding shutter is swung. The degree of freedom increases, and the degree of freedom in designing the vehicle headlamps also increases, enabling a novel design.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to FIGS.
The embodiments described below are preferable specific examples of the present invention, and thus various technically preferable limitations are given. However, the scope of the present invention particularly limits the present invention in the following description. As long as there is no description of the effect, it is not restricted to these aspects.

[Example 1]
FIG. 1 shows a configuration of an embodiment of a vehicle headlamp incorporating a light-shielding shutter driving device according to the present invention.
In FIG. 1, a vehicle headlamp 10 includes a bulb 11 as a light source, a reflection surface 12 that reflects light from the bulb 11 forward, and a projection lens 13 that is disposed in front of the reflection surface 12. The light shielding shutter 14 disposed between the reflecting surface 12 and the projection lens 13 and the light shielding shutter driving device 20 (see FIG. 2) for swinging the light shielding shutter 14 are configured.

  The bulb 11 is a bulb generally used for an automobile headlamp or an auxiliary headlamp. For example, a bulb such as an incandescent bulb, a halogen bulb, a halogen bulb with an infrared reflecting film, or a discharge lamp such as a metal halide lamp is used. In use, the optical axis O is arranged almost horizontally toward the front, is fixedly held by a socket (not shown), and is supplied with power from the outside.

  The reflecting surface 12 is formed in a concave shape so as to reflect the light from the bulb 11 forward, and the first focal position F1 is located in the vicinity of the light emitting point of the bulb 11, It is configured as an elliptical reflecting surface so that the second focal position F2 is positioned on the optical axis O extending forward from the bulb 11 on the front side. Here, the elliptical reflecting surface includes not only a spheroid and an elliptic cylinder but also a free-form surface based on an ellipsoid.

  The projection lens 13 is composed of a convex lens, and is arranged on the optical axis O so that the focal point on the light source side is located near the second focal position F2 of the reflecting surface 12. ing.

The light shielding shutter 14 is formed in a plate shape from an opaque material, and its upper edge 14a is near the focal position on the light source side of the projection lens 13, that is, near the second focal position F2 of the reflecting surface 12. It is arranged to be located in.
The light shielding shutter 14 has an upper edge 14a that forms a desired light distribution pattern.

Further, the light shielding shutter 14 is configured such that an upper part (movable part) 14b including an upper edge 14a thereof can swing with respect to another part (base) 14c. The apparatus 20 is configured to rotate and move from the insertion position A indicated by the solid line in FIG. 1 to the retreat position B indicated by the dotted line from the rear side.

  Specifically, as shown in detail in FIG. 2, the movable portion 14b of the light-shielding shutter 14 has both ends of a rotating shaft 14d extending horizontally in the horizontal direction with respect to the optical axis O on a base 14c fixedly arranged. It is supported so as to be rotatable.

  Here, as shown in FIG. 2, the light-shielding shutter driving device 20 includes a direct acting actuator 21 and a crankshaft 22.

The direct acting actuator 21 is composed of, for example, a solenoid, and its drive shaft 21a moves by a predetermined distance along the axial direction during operation.
The direct acting actuator 21 is fixedly arranged with respect to the base 14c.

The crankshaft 22 is composed of a shaft portion 23 extending vertically and two arms 24 and 25 extending vertically from the lower end and the upper end of the shaft portion 23, respectively.
The shaft portion 23 is rotatably supported by a bearing 23 a with respect to the base 14 c of the light shielding shutter 14.

The lower first arm 24 extends a predetermined distance L1 from the lower end of the shaft portion 23 toward one side, and is further bent downward.
The bent portion 24 a of the first arm 24 is engaged with the engagement hole 21 b provided in the drive shaft 21 a of the linear motion actuator 21 described above.

The upper second arm 25 extends from the upper end of the shaft portion 23 toward one side, that is, parallel to the first arm 24 by a predetermined distance L2, and is further bent upward.
The bent portion 25a of the second arm 25 is engaged with the engaging portion 14e provided on the movable portion 14b of the light shielding shutter 14 described above.
In the case shown in the drawing, the engaging portion 14e has an “inverted L” shape that protrudes forward from the movable portion 14b, and the second arm is disposed inside the inverted L shape. 25 bent portions 25a are loosely engaged.

  In this way, the light shielding shutter 14 forms a cut-off line for the low beam for traveling on a general road with the upper edge 14a at the insertion position A described above, and at the upper edge at the retreat position B described above. A cut-off line for the traveling beam is formed by 14a.

The vehicle headlamp 10 according to the embodiment of the present invention is configured as described above, and the bulb 11 is supplied with power from the outside to emit light. Thereby, light is emitted from the light emitting portion of the bulb 11.
Then, the light emitted from the bulb 11 is reflected directly or by the reflecting surface 12, travels forward toward the vicinity of the second focal point F 2 of the reflecting surface 12, and further converged by the projection lens 13. Irradiated towards.

Here, when the movable portion 14b of the light shielding shutter 14 is at the insertion position A as shown by a solid line in FIG. 1, a part of the light emitted from the bulb 11 is transmitted by the light shielding shutter 14. The cut-off line is formed by the upper edge 14a.
Therefore, since a cut-off line similar to the conventional passing beam is formed, an optimal light distribution pattern for the passing beam that does not dazzle oncoming vehicles and pedestrians can be obtained.

On the other hand, when the direct acting actuator 21 of the light-shielding shutter driving device 20 operates and the drive shaft 21a is moved in the suction direction (arrow P direction), the crankshaft 22 is Similarly, the tip of the arm 24 moves in the direction of the arrow P, and the crankshaft 22 is rotationally driven.
Then, the tip of the second arm 25 of the crankshaft 22 similarly moves in the direction of the arrow P, and the movable portion 14b of the light shielding shutter 14 swings around the horizontal rotating shaft 14d. As a result, the upper edge 14a of the movable portion 14b of the light shielding shutter 14 swings in the direction of the arrow Q and moves from the insertion position A to the retracted position B.

Therefore, the light from the bulb 11 or the reflecting surface 12 is irradiated forward through the projection lens 13 without being blocked by the light shielding shutter 14.
In this way, since the cut-off line is not formed by the upper edge 14a of the light shielding shutter 14, an optimum light distribution pattern can be obtained for a traveling beam with good distance visibility.

Here, when the movable portion 14b of the light shielding shutter 14 is in the retracted position B, the upper edge of the base 14c, which is a fixed portion of the light shielding shutter 14, is incident on the projection lens 13 from the bulb 11 or the reflecting surface 12. It may be inserted in the optical path. In this case, the upper edge of the base 14c is positioned slightly below the vicinity of the focal position F2 on the rear side of the projection lens 13. Therefore, the cut-off line formed by the upper edge of the base 14c is formed slightly above the cut-off line by the upper edge 14a of the light shielding member 14 located at the insertion position A.
Thereby, distant visibility is improved, and a light distribution pattern for a passing beam that is optimal for highway driving, for example, is formed.

In this way, when the light shielding shutter 14 is in the insertion position A, a cut-off line is formed by the upper edge 14a, so that it is not dazzling for oncoming vehicles and pedestrians and is optimal for general road driving. A light distribution pattern of passing beams can be obtained.
Further, when the light-shielding shutter 14 is in the retracted position B, the cut-off line is not formed by the upper edge thereof, or the cut-off line slightly rises, so that the light distribution pattern as a traveling beam or the distance visibility is good. The light distribution pattern of the passing beam that is optimal for highway driving is obtained.

Further, in this case, the light-shielding shutter driving device 20 includes a direct-acting actuator 21 and a crankshaft 22, and the direct-acting actuator 21 is relatively separated from the light-shielding shutter 14 via the crankshaft 22, Further, the drive shaft 21a is arranged in parallel with the optical axis O.
Therefore, the width of the light shielding shutter driving device 20 and the vehicle headlamp 10 can be made relatively small, and even if the space around the light shielding shutter 14 of the vehicle headlamp 10 is small, the shaft portion 23 of the crankshaft 22 Since the direct acting actuator 21 is disposed below the length, the direct acting actuator 21 can be disposed at a position relatively away from the light shielding shutter.
Therefore, the degree of freedom of arrangement of the direct acting actuator 21 and the degree of freedom of design of the vehicle headlamp 10 are increased, and any vehicle headlamp can be designed.

  Further, by appropriately selecting the lengths L1 and L2 of the arms 24 and 25 of the crankshaft 22, for example, a commercially available solenoid is used as the direct acting actuator 21, and the amount of movement of the drive shaft 21a is adjusted. Based on this, the amount of movement of the tip of the second arm 25 can be obtained. Therefore, it is not necessary to prepare a dedicated product as the direct acting actuator 21, so that the direct acting actuator 21 can be procured at a low cost.

[Example 2]
FIG. 3 shows a second embodiment of the light-shielding shutter driving device according to the present invention. In FIG. 3, the light-shielding shutter driving device 30 has the same configuration as that of the light-shielding shutter driving device 20 shown in FIG.
The light-shielding shutter driving device 30 is different from the light-shielding shutter driving device 20 shown in FIG. 2 only in that the movable portion 14b of the light-shielding shutter 14 is swung forward by the direct acting actuator 21. .
Correspondingly, in the light shielding shutter driving device 30, the crankshaft 22 has the second arm 25 extending on the side opposite to the first arm 24 and the movable portion 14 b of the light shielding shutter 14. The engaging portion 14e provided in the “F” has an “F” shape.
Thereby, the bent portion 25a of the second arm 25 is loosely engaged with the inside of the F-shape.

According to the light-shielding shutter driving device 30 configured as described above, the operation is the same as that of the light-shielding shutter driving device 20 described above, and the linear actuator 21 is operated so that the drive shaft 21a is in the suction direction (the direction of the arrow P). ), The tip of the first arm 24 of the crankshaft 22 similarly moves in the direction of the arrow P, and the crankshaft 22 is rotationally driven.
Then, the tip of the second arm 25 of the crankshaft 22 moves in the direction opposite to the arrow P direction, and the movable portion 14b of the light shielding shutter 14 swings around the horizontal rotation shaft 14d. As a result, the upper edge 14a of the movable portion 14b of the light shielding shutter 14 swings in the direction of the arrow R and moves from the insertion position A to the retracted position B.

[Example 3]
FIG. 4 shows a third embodiment of the light-shielding shutter driving device according to the present invention. 4, the light-shielding shutter driving device 40 has the same configuration as that of the light-shielding shutter driving device 20 shown in FIG. 3, and thus the same components are denoted by the same reference numerals and description thereof is omitted.
The light-shielding shutter driving device 30 differs from the light-shielding shutter driving device 20 shown in FIG. 3 only in that the direct-acting actuator 21 has a drive shaft 21a disposed laterally with respect to the optical axis O. It has become.
Correspondingly, in the light shielding shutter driving device 40, the crankshaft 22 has the first arm 25 extending forward in parallel to the optical axis O.

According to the light-shielding shutter driving device 40 configured as described above, the operation is the same as that of the light-shielding shutter driving device 30 described above, and the linear actuator 21 is operated so that the drive shaft 21a is in the suction direction (the direction of the arrow S). ), The tip of the first arm 24 of the crankshaft 22 is similarly moved in the arrow S direction, and the crankshaft 22 is rotationally driven.
Then, the tip of the second arm 25 of the crankshaft 22 moves rearward, and the movable portion 14b of the light shielding shutter 14 swings around the horizontal rotating shaft 14d. As a result, the upper edge 14a of the movable portion 14b of the light shielding shutter 14 swings in the direction of the arrow R and moves from the insertion position A to the retracted position B.

  Thus, according to the present invention, the movable portion 14 b of the light shielding shutter 14 is swung via the crankshaft 22 by the direct acting actuator 21. For this reason, even if the direct acting actuator 21 is arranged in parallel or laterally with respect to the optical axis O, by appropriately selecting the extending directions of the first arm 24 and the second arm 25 of the crankshaft 22 The movable part 14b of the light shielding shutter 14 can be reliably swung by the direct acting actuator 21.

  Further, by appropriately selecting the lengths L1 and L2 of the first arm 24 and the second arm 25 of the crankshaft 22, the second arm 25 can be moved in accordance with an arbitrary amount of movement of the drive shaft 21a. It is possible to adjust the amount of movement of the tip. Therefore, it is possible to swing the movable portion 14b of the light-shielding shutter 14 by a desired amount of movement using a commercially available direct acting actuator such as a solenoid.

In the embodiment described above, the direct acting actuator 21 is arranged along the optical axis O or laterally. However, the present invention is not limited thereto, and may be arranged obliquely with respect to the optical axis O. At that time, by appropriately selecting the extending direction of the arms 24 and 25 of the crankshaft 22, the movable portion 14b of the light shielding shutter 14 can be swung forward or backward.
In the above-described embodiment, the light shielding shutter 14 includes a part including the upper edge 14a as the movable part 14b. However, the present invention is not limited thereto, and the entire light shielding shutter 14 is configured as the movable part 14b. Obviously it may be.

  In this way, according to the present invention, the position of the light-shielding shutter in the projector-type vehicle headlamp can be easily changed with a simple configuration while maintaining a large degree of freedom in designing the vehicle headlamp. An extremely excellent vehicle headlamp and light-shielding shutter driving device can be provided.

1 is a schematic side view showing a configuration of a vehicle headlamp incorporating a first embodiment of a light-shielding shutter driving device according to the present invention. It is a schematic perspective view. It is the schematic perspective view seen from diagonally forward which shows the structure of the light-shielding shutter drive device in the vehicle headlamp of FIG. It is the schematic perspective view seen from diagonally forward which shows the structure of 2nd embodiment of the light-shielding shutter drive device by this invention. It is the schematic perspective view seen from diagonally forward which shows the structure of 3rd embodiment of the light-shielding shutter drive device by this invention. It is a schematic perspective view which shows the structure of an example of the conventional vehicle headlamp.

Explanation of symbols

10 Vehicle headlights 11 Bulb (light source)
DESCRIPTION OF SYMBOLS 12 Reflective surface 13 Projection lens 14 Light-shielding shutter 14a Upper edge 14b Movable part 14c Base 14d Rotating shaft 14e Engagement part 20 Light-shielding shutter drive device 21 Direct acting actuator 21a Drive shaft 21b Engagement hole 22 Crankshaft 23 Shaft part 23a Bearing 24 First arm 24a Bent part 25 Second arm 25a Bent part A Insertion position B Retraction position

Claims (6)

Oscillating a part (movable part) including at least the upper edge of a plate-shaped light-shielding shutter in which the upper edge is arranged near the light source side focal position of the projection lens in the projector type vehicle headlamp around a horizontal axis; A light-shielding shutter driving device,
A crankshaft rotatably supported around a vertical shaft, and a linear actuator having a drive shaft that engages with a tip of a first arm extending vertically from one end of the crankshaft. ,
The light-shielding shutter driving device, wherein the tip of the second arm of the crankshaft of the driving device is engaged with a position shifted vertically from the horizontal axis of the movable portion of the light-shielding shutter.   2. The light-shielding shutter driving device according to claim 1, wherein a drive shaft of the linear actuator is disposed in parallel with an optical axis of the projection lens.   2. The light-shielding shutter drive device according to claim 1, wherein a drive shaft of the linear motion actuator is disposed perpendicular to the optical axis of the projection lens.   The light-shielding shutter driving device according to claim 1, wherein the direct acting actuator is a solenoid.   5. The light-shielding shutter drive according to claim 1, wherein the length of each arm of the crankshaft is selected according to the movement distance of the drive shaft and the movement distance of the light-shielding shutter, respectively. apparatus. A light source;
Arranged so that the first focal position is located near the light source and the second focal position is located on the optical axis of the light source extending substantially horizontally forward so that the light from the light source is reflected forward A concave ellipsoidal reflective surface toward the front,
A convex projection lens arranged in front of the reflecting surface, on the optical axis of the light source, so that the focal position on the light source side is located near the second focal position of the reflecting surface;
A plate-shaped shading shutter disposed near the second focal position of the reflecting surface and formed so that the upper edge defines a cut-off line;
With
A part (movable part) including at least the upper edge of the light shielding shutter is supported so as to be swingable around a horizontal axis extending in a direction transverse to the optical axis,
A driving device for swinging the movable part of the light-shielding shutter to the front side or the rear side;
A vehicle headlamp,
A vehicle headlamp, wherein the driving device is the light-shielding shutter driving device according to any one of claims 1 to 5.

Images