KR100832515B1 - Lamp shield driving apparatus and lamp assembly using it - Google Patents

Abstract

A lamp shield driving apparatus and a lamp assembly using the same are provided to secure a view angle suitable for various road conditions by changing beam patterns of a head lamp according to a various driving environment. A lamp shield driving apparatus blocks a part of light provided from a light source with shields(130,140). A lens focuses the blocked light on the front. A housing accommodates the light source and the lamp shield driving apparatus. The shields have a cut-off pattern. A lead screw(150) is bolt-nut-coupled to the shields. An actuator rotates the lead screw. At least two different beam patterns are formed by a straight movement or a rotational movement of the shields according to the revolution of the lead screw. The lamp shield driving apparatus includes a shield cover. A guide slot(121) is formed on the shield cover(120). The guide slot guides a straight movement and a rotational movement of a slider(132) formed on the shield.

Description

Lamp shield driving apparatus and lamp assembly using it

1 is a schematic view showing the configuration of a headlamp of a general projection type.

2A-2D illustrate examples of implementing various beam irradiation patterns.

3 shows the motion of the first shield due to the torque of the step motor;

4 is a cross-sectional view showing the coupling between the lead screw and the first shield.

5A to 5B are free object diagrams illustrating the characteristics of the spiral motion .

FIG. 6 shows the force components formed in the lead screw and the shield actuator assembly connected thereto. FIG.

FIG. 7 is a view showing a motion component when disturbing the rotational motion of the first shield. FIG.

8 shows the motion components when the linear motion of the first shield is disturbed.

9 is a diagram showing that various classes can be represented through the linear motion of the first shield.

10 shows the principle of high beam implementation by enabling the first shield to rotate in the position of the open slot.

11 shows an emergency safety function according to an embodiment of the present invention.

12 illustrates the principle of implementing class C.

13 shows the principle of implementing a class V;

14 shows the principle of implementing class E;

15 shows a principle for implementing a high beam pattern.

FIG. 16 illustrates a downlight dynamic bending and additional reflection beam pattern of a vehicle traveling at an intersection. FIG.

17 illustrates a configuration for introducing an additional reflective surface to provide an additional beam pattern.

18 is a free body diagram showing the rotation and rotation of the planetary gears that make up the tooth gears and the sun gear.

19 shows a further beam irradiation direction of a lamp assembly according to an embodiment of the present invention.

20 is an exploded perspective view of a lamp assembly according to an embodiment of the present invention.

(Symbol description of main part of drawing)

100 lens 102 lens fixing portion

103: opening 104: light source

108a, 108b, 108c, 108d, 108e, 122, 182: bearing

110: return spring

112: reflector unit 113: main reflector

114: upper bracket 120: shield cover

121: guide slot 130: the first shield

131: female thread 132: slider

140: second shield 141, 142: hollow rotating guide portion

143: reverse reflector 150: lead screw

160: shield actuator assembly 161, 186: step motor

170: Additional reflector 175: Additional reflector shaft

176: planetary gear 180: lower bracket

181: sun gear 185: rotary actuator assembly

190: rotating frame 191: upper rotary shaft

192: lower rotating shaft 193: circular hole

195: side cover

The present invention relates to a headlamp for a vehicle, and more particularly to a lamp assembly that provides a variety of beam patterns according to the driving environment of the vehicle.

A head lamp, also known as a headlight, is a lamp that functions to shine ahead of a vehicle, and requires brightness that can identify obstacles on the road at a distance of 100 meters ahead at night. Standards of such headlamps are set differently from country to country, and in particular, the head lamp beam pattern configuration is set differently depending on whether it is a right traffic (left driving) or a left traffic (right driving).

In general, the headlamp of the left-hand drive (LHD) vehicle is adjusted to be directed farther to the right of the vehicle driving direction about the center line of the road, and the right-hand drive (RHD) is used. The vehicle is adjusted so that the beam of the vehicle is irradiated farther to the left of the travel direction. That is, regardless of whether it is left or right driving, the beam of the headlamp is adjusted to be irradiated more weakly in the direction adjacent to the center line on the vehicle traveling axis. In this way, it is legal to configure the beam pattern of the headlamp so as not to cause glare of the driver in the opposite vehicle.

Existing vehicle headlamps provide drivers with a fixed lighting pattern regardless of various road conditions, and automatically adjusts the direction of lamp irradiation according to the continuously changing road curvature to provide visibility for driving. A reliable dynamic bending lamp has been developed. The dynamic bending lamp has a function of swiveling left and right by receiving signals such as the angle of the steering wheel and the speed of the vehicle as the vehicle travels on a curved road. However, due to high-speed driving, which requires longer viewing distance than existing vehicles, the surrounding lighting is brighter than other roads, and the driving of the city is less dependent on the brightness of the headlamp, and the reflection is caused by rain, snow, or wet roads. When driving in bad weather, where the glare of the car is increased and the visibility is decreased, a proper view for the driver to drive safely is not obtained.

Therefore, there is a need to devise a technology that helps secure driving by ensuring proper visibility at all times by providing an illumination pattern optimized for environmental conditions such as various road conditions and climate compared to the existing fixed illumination pattern.

The technical problem to be achieved by the present invention is to enable the driver to secure a viewing angle suitable for various road conditions by automatically converting the lighting pattern to an optimal state according to the road conditions and climatic conditions continuously changing as the vehicle travels.

Technical problems of the present invention are not limited to the technical problems mentioned above, and other technical problems not mentioned will be clearly understood by those skilled in the art from the following description.

In order to achieve the above technical problem, a light source, a reflector for reflecting the light emitted from the light source, a lamp shield driving device for blocking a portion of the light reflected by the reflector, and is not blocked by the shield A projection lamp module comprising a lens that deflects the traveling light and concentrates in a forward direction; A rotary actuator for rotating the module about a predetermined drive shaft; And an additional reflector that rotates with the rotation of the module and re-reflects the light blocked by the shield, irradiating in a rotational direction proportional to the accompanying angle of rotation.

A lamp assembly comprising a housing for receiving the light source and the lamp shield driving device, the lamp shield driving device comprising: a shield having a predetermined cut-off pattern; A lead screw forming a bolt-nut coupling with the shield; And an actuator for rotating the lead screw, wherein at least three different beam patterns are formed by performing linear movement or rotational movement of the shield according to the rotation of the lead screw.

Advantages and features of the present invention and methods for achieving them will be apparent with reference to the embodiments described below in detail with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but will be implemented in various forms, and only the present embodiments are intended to complete the disclosure of the present invention, and the general knowledge in the art to which the present invention pertains. It is provided to fully convey the scope of the invention to those skilled in the art, and the present invention is defined only by the scope of the claims. Like reference numerals refer to like elements throughout.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a schematic diagram showing the configuration of a headlamp 10 of a general projection type. Such a projection type headlamp has a characteristic that light is collected in one place by the reflectors 12 and 13 and the lens 15, which is advantageous in the light distribution surface than the general clear type, It offers a sporty aesthetic.

The light emitted from the light source 11 is reflected by the mirror surface 12 of a predetermined shape (eg, ellipsoid) and concentrated at one point in all directions (focus) 16 of the light source 11. The concentrated light is refracted by the refraction lens 15 provided at the front side and irradiated substantially in all directions. However, due to the nature of the light reflected on the ellipsoid, the light emitted upward is reflected by the upper mirror surface 12 and proceeds downward, and the light emitted downward is lower mirror surface 13. Reflected by and proceeds upwards. By the way, except for the case of irradiating a high beam, the light reflected by the reflector is blocked by the shield 14 near the point 16 so as not to cause inconvenience to other drivers. have.

As described above, the projection type headlamp 10 is different from the clear type headlamp since the light reflected from the reflectors 12 and 13 is substantially concentrated at one point 16. 16) Various beam irradiation patterns can be formed even if the shape of the vicinity is slightly different. Therefore, a predetermined driving device is provided to drive the shield to provide various beam patterns.

2A to 2D are diagrams showing examples of implementing various beam irradiation patterns on a road. 2A shows class C among these. Class C is a beam pattern 21 suitable when the vehicle 20 is traveling in a general environment such as a country road. Class C is a pattern in which light quantity is improved while securing a view of an opposite lane, similar to a general low beam.

2B shows class V. Class V is a beam pattern suitable when the vehicle 20 travels in an environment where the brightness of the surrounding lights is secured to some extent, such as a city area. In particular, the left / right field of view is wider than that of class C 21, and a field of view that is somewhat shorter than the class C 21 (about 50 to 60 m in front) is secured. However, in order to widen the left / right field of view as shown in FIG. 2B, the direction of irradiation of the left / right headlamps is slightly tilted outward, and an auxiliary device such as additional reflection disclosed below may be further utilized. .

2C shows class E. Class E is a beam pattern that is suitable when the vehicle 20 is traveling at high speed on highways or on roads where substantial straight sections are maintained. Thus, the class E 23 has a characteristic that the front far field is somewhat longer than the class C 21.

Finally, FIG. 2D shows a class W. FIG. Class W 24 is a beam pattern suitable when the vehicle 20 is driving in rainy weather or on wet roads. Therefore, the brightness for securing the front view is somewhat similar to class E 23, but in order to reduce the reflective glare caused by the road surface to a certain distance in front of the vehicle, it is characterized by reducing the amount of light.

As shown in Figs. 2A to 2D, the actual vehicle 20 needs to change the beam pattern variably according to various driving environments. In particular, the use of a projection type headlamp is advantageous in the light distribution surface, and it is possible to change various beam patterns simply by changing the shield. However, the conventional beam pattern changing method has a problem in that its configuration is complicated, so that manufacturing cost is high or it is difficult to accurately control a shield pattern for forming a specific beam pattern.

To this end, in the present invention, two shields (the first shield and the second shield) are overlapped, and one of the shields is relatively moved in the horizontal direction, so that various downlight beam patterns (class C, class E, and class V are obtained). In addition, the present invention also proposes a technique for forming a high-light pattern by rotating the first shield and the second shield by a predetermined angle together. In addition, in order to eliminate the complexity of the device, a configuration is proposed in which the horizontal movement and rotational movements can be made by one actuator.

3 to 8 are diagrams showing the principle of moving the first shield according to an embodiment of the present invention. Referring to FIG. 3, the step motor 161 included in the shield actuator assembly 160 is directly connected to the lead screw 150, thereby rotating the lead screw 150 by an arbitrary angle. The lead screw 150 forms a bolt-nut coupling with the first shield 130 (see FIG. 4), and the end 151 opposite the step motor 161 is supported to be rotatable by the bearing 108e. .

The torque applied to the lead screw 150 by the step motor 161 causes the first shield 130 to rotate or linearly move according to the boundary condition. At this time, the fixing portions 162 and 163 of the shield actuator assembly 160 including the step motor 161 absorb and support the repulsive force due to the torque action.

FIG. 5A is a diagram illustrating a spiral motion in which a spiral motion can be physically represented by two types of motion components, a linear motion and a rotational motion. As shown in the free object diagram of FIG. The spiral motion in the direction can be divided into the velocity components of the two motions. That is, it can be represented by the linear motion speed component V _T traveling in the axial direction and the tangential speed component V _R of the motion rotating about the axis.

FIG. 6 illustrates forces acting on the lead screw 150 and the shield actuator assembly 160 connected thereto. Ultimately, the lead screw 150 has a helical tooth and generates a rotational motion by the actuator assembly 160. When rotating the lead screw 150 having a helical tooth, at one point on the lead surface of the lead screw 150, a rotational force P, which is a force in the rotational direction, and a thrust Q in the axial direction are generated. At this time, the reaction force against rotation is canceled by the drive torque T of the step motor 161, the reaction force R _Q against the thrust Q is formed in the fixed portion of the shield actuator assembly 160.

In general, the rotational force P and the thrust Q, which are the force components generated in the spiral surface of the bolt when the bolt-nut coupling is made, can be calculated by the following equation (1). Here, T, d, λ, and ρ represent drive torque, pitch diameter, lead angle and friction angle, respectively, and lead angle and friction angle are important factors for determining screw efficiency.

As described above, at any one point of the lead surface of the first shield 130 which makes the bolt-nut coupling with the lead screw 150 is subjected to the rotational force P and the thrust Q. At this time, the two-way force causes the first shield 130 to generate the motion components VT and VR in the two directions described with reference to FIG. 5B, and if one of the two motions is disturbed for any reason. Only one other movement remains.

FIG. 7 is a view showing the remaining movement direction when the rotational motion of the first shield 130 is disturbed. At this time, since the rotational force is canceled by the disturbing force, the lead screw 150 transmits only the thrust to the first shield 130. Therefore, the first shield 130 makes a linear movement along the axial direction of the lead screw 150.

On the contrary, FIG. 8 is a view showing the direction of movement remaining when the linear movement of the first shield 130 is disturbed. In this case, since the thrust is canceled by the disturbing force, the first shield 130 receives only the rotational force. Accordingly, the first shield 130 is simultaneously rotated about the axis of the lead screw 150 without any sliding movement with the lead screw 150 by the rotation force P.

FIG. 9 is a diagram illustrating that various classes C, E, and V may be represented through a linear movement of the first shield 130.

The lead screw 150 and the female threaded portion 131 of the first shield 130 form a bolt-nut coupling, and the end 151 of which the thread is not formed in the lead screw 150 is the lead screw bearing 108e. It is supported so that rotation is possible.

A slider 132 is formed at a lower end of the first shield 130, and the slider 132 is guided by the guide slot 121 of the shield cover 120. However, the guide slot 121 is a closed slot 121a for guiding only the linear movement of the slider 132 and an open slot that suppresses linear movement at the end of the guide slot 121 and allows only rotational movement. It may be made of (121b). When even a part of the slider 132 spans the closing slot 121a, since the rotational motion of the first shield 130 is restrained, only linear movement is allowed along the axial direction of the lead screw 150, and the slider 132 When the entire section of is located in the open slot 121b completely away from the closed slot 121a, the rotational movement starts.

The second shield 140 is coupled to the rotation guide bearings 108b and 108c on the shield cover 120 and the side cover 195 by the hollow rotation guide parts 141 and 142, and the rotation center thereof is the lead screw 150. Is the same as the axis of rotation. In addition, the first shield 140 is in contact with the surface, but if the contact surface is virtually extended so as to pass through the axis of rotation of the lead screw 150 so that the force is transmitted perpendicular to the contact surface during rotation. The second shield 140 is supported by the return spring 110 to maintain the surface contact with the first shield 130 unless a special external force is applied.

In the state of FIG. 9, when the step motor 161 is rotated in a certain direction, the first shield 130 is linearly moved along the guide slot 121 by the lead screw 150, using the slider 132. It is possible to form two or more downlight beam patterns within a range that does not leave the closed slot 121a.

If the slider 132 is located at the end of the guide slot 121, the slider 132 is located in the open slot 121b out of the closed slot 121a to receive the rotational force by the lead screw 150. Therefore, as shown in FIG. 10, the first shield 130 starts to rotate around the axis of rotation of the lead screw 150, and the second shield 140 receives a force perpendicular to the contact surface. At this time, if the received rotational force is greater than the rotational force of the return spring 110 supporting the second shield 140, the second shield 140 has the same rotational center axis as the first shield 130 and simultaneously rotates. Done.

As the shields 130 and 140 rotate in this manner, the height is reduced based on the vertical line. In this case, since the light irradiated from the lamp is no longer disturbed by the shields 130 and 140, the uplight pattern may be achieved.

However, there may be a situation in which a failure of the shield actuator assembly 160 occurs while driving in an uplight state as shown in FIG. 10. In this situation, however, continuing to run in the high beam state greatly threatens the safety of the driver or other drivers. Therefore, in an emergency situation in which the shield actuator assembly 160 does not operate, a function of automatically returning from the high light state to the low light state is required. When such a so-called emergency safe function is required, the configuration according to the present invention is mechanically downward by the rotational torque of the return spring 110 by cutting off the power of the step motor 161 as shown in FIG. The function of returning to the back state can also be provided.

12 to 15 are diagrams showing how beam patterns of each class are generated.

12 illustrates a principle of implementing class C. Various classes may be implemented according to which profile is formed at the point A where the light of the projection lamp is concentrated. The case where the first shield 130 and the second shield 140 are accurately overlapped represents class C. FIG. The class C is implemented by a cut off pattern of the first shield 130, and the second shield 140 is not directly involved in the implementation of the pattern. The shield pattern p _c of class C consists of a combination of two horizontal segments (upper segment and lower segment) and segments which connect them and are directed downward at an angle. The two horizontal line segments have a step size t _{1 in the} vertical direction.

13 shows a principle of implementing class V. FIG. In a class C state as shown in FIG. 12, when the first shield 130 moves more than a predetermined distance, the first shield 130 is in a class V state. At this time, at the point A where the light of the projection lamp is concentrated, at least a lower half or more of the shield of the class V is covered by the horizontal portion (the higher level horizontal portion of the two horizontal portions) of the first shield 130. The pattern p _v is formed. Therefore, class V has a shorter beam irradiation distance than class C or class E and has a function to prevent unnecessary glare in a city with sufficient ambient light such as a street lamp.

In addition, it is helpful to form a wider viewing angle in the left and right directions of the vehicle 20 in order to cope with the accidental or sudden situation that may occur on the side of the road or the road when driving in the city. To this end, it is additionally necessary to ensure the direction of irradiation of the left / right headlamps to be somewhat swiveled outward or to secure left and right illumination, such as additional reflections, which will be described below.

14 shows a principle of implementing class E. In the class C state as shown in FIG. 12, when the first shield 130 moves more than a predetermined distance in the direction opposite to the implementation direction of the class V, the first shield 130 is in the class E state. Class E is implemented by the cut off pattern of the second shield 140. The shield pattern p _e of class E, formed at the point A where the light of the projection lamp is concentrated, consists of two horizontal segments and a combination of two segments that connect them and right-down at a predetermined angle, as shown. The two horizontal segments have a step of a smaller size (t ₂ ) than the class C in the vertical direction, and the slope of the right downward segment is steeper than the right downward segment in the class C.

15 is a view illustrating a principle of implementing a high beam. When the linear motion is further passed through the class E state as shown in FIG. 14, that is, when the first shield 130 is moved as much as possible along the closed slot 121a, the first shield 130 and the second shield as shown in FIG. 10. 140 is rotated about the axis of the lead screw 150. As described above, the rotation of the shields 130 and 140 means that the height is lowered from the B position to the B ′ position based on the vertical line. In this case, since the light emitted from the light source is no longer disturbed by the shields 130 and 140, the upward light pattern may be achieved.

Up to now, the technique of implementing various beam patterns by moving the shield by driving one actuator has been described. However, as shown in FIG. 1, in the case of implementing a downlight, a part of the light emitted from the light source is inevitably lost by being blocked by the shield. Accordingly, the present invention is to disclose a configuration that provides an additional beam pattern to recycle the lost light, so as to secure a viewing angle when the vehicle travels on a curved road.

FIG. 16 illustrates a downlight beam pattern 31 and an additional beam pattern 32 of a vehicle 20 driving at an intersection. Techniques for making the downlight beam pattern 31 also rotate proportionally in accordance with the steering angle of the wheels of the vehicle traveling at intersections or curved roads, so-called dynamic bending techniques, are generally known. However, in the intersection or curve road with a very large curvature as shown in FIG. 16, the turning beam beam pattern 31 alone is not sufficient to secure the driver's view. Thus, an additional beam pattern 32 needs to be provided. At this time, as shown in Fig. 16, it is necessary to control the angle at which the additional beam is irradiated to be a predetermined multiple of the angle at which the downlight is irradiated.

17 is a diagram illustrating a configuration for introducing an additional reflector to provide an additional beam pattern. The reverse reflector 143 is provided on the rear surface of the second shield 140 (the direction of looking at the lamp). The reverse reflector 143 reflects the light blocked by the shields 130 and 140 from the light emitted from the lamp toward the additional reflector 170. The additional reflector 170 reflects forward the light provided from the reverse reflector 143 to form the additional beam pattern 32. The planetary gear mechanism is used in the present invention to automatically control the angle at which the additional beam is scanned to be a predetermined multiple of the angle at which the downlight is irradiated. The planetary gear 176 formed at the end of the shaft 175 of the additional reflector 170 has a structure capable of revolving and rotating around the sun gear 181 formed in the lower bracket 180.

At this time, the focus of the additional reflector 170 may be set to a virtual focus on an extension line of the light reflected by the retroreflective mirror, and the central axis of the planetary gear 176 and the shaft 175 may be the additional reflector 170. By configuring to pass through the focus of the additional reflector 170, even when rotating, the focus of the additional reflector is configured so that its position does not always change.

FIG. 18 is a view illustrating a planetary gear 176 that is tooth-connected with the sun gear 181 provided in the lower bracket 180 to rotate and rotate. Looking specifically at the planetary gear mechanism, the sun gear 181 forms a pitch circle centered on the lower axis of rotation (192 in FIG. 20) provided in the swivel unit 190 (FIG. 20), and the planetary gear ( 176 forms a pitch circle centered on the additional reflector shaft 175. An arm 99 is located between the centers of the two pitch circles. The arm 99 has a rotation frame (190 of FIG. 20) to play a role, and the distance between the centers of two pitch circles is the center of the lower rotation axis (192 of FIG. 20) and the circular hole (FIG. 20) of the rotation frame (190 of FIG. 20). 193) is the distance between the center of the axis. The arm 99 rotates about the pitch circle center of the fixed sun gear 181 to generate a planetary motion of the additional reflector shaft 175.

At this time, when the pitch circle radius of the sun gear 181 is R and the pitch circle radius of the planetary gear 176 is r, the distance between the two rotation centers is R + r. In addition, if the revolving angle of the additional reflector shaft 175 is θ and the rotating angle is φ, the following Equation 2 is satisfied.

R × θ = r × φ

Rewriting Equation 2 gives R / r = φ / θ. Here, the revolving angle θ is equal to the angle at which the rotating frame 190 rotates, and the rotating angle φ is equal to the angle at which the additional reflector shaft 175 rotates. Accordingly, by adjusting the ratio of R / r, it is possible to determine how much more the additional reflector 170 is to be rotated relative to the rotation frame 190. For example, when R / r is 3, the additional reflector 170 is rotated by 3 times more than the rotation frame 190. Even if the rotation frame 190 rotates only 15 degrees on the curved road, the additional reflector 170 has a rotation angle of 45 degrees, which results in a total rotation of 60 degrees in the vehicle traveling direction.

19 is a view showing a beam irradiation direction of the lamp assembly 1000 according to an embodiment of the present invention. Based on the traveling direction C of the vehicle 20, the downward light direction D is inclined by θ than the reference direction C, and the additional beam direction E is inclined by φ more than the downward light direction D. According to Equation 2, when the vehicle 20 goes straight and θ is 0, φ is also 0, but as the curvature of the driving road increases, the angle between φ, i.e., the turning direction D and the additional beam direction E becomes larger. It can be seen that. As a result, the additional beam direction can be dynamically adjusted according to the curvature of the driving road.

20 is an exploded perspective view of the lamp assembly 1000 according to an embodiment of the present invention. The lamp assembly 1000 includes a light source 104, a lamp shield driving device (not shown) for providing various beam patterns by actively blocking a part of the light provided by the light source 104 by the shield, a lens 100, It may be configured to include a lens fixing portion 102, the rotating frame 190, the reflector unit 112, the upper bracket 114, the additional reflector 170, the lower bracket 180 and the rotating actuator assembly 185. . The lamp shield driving apparatus includes at least shields 130 and 140, lead screws 150, and shield actuator assembly 160, and may further include a shield cover 120.

The light source 104 is a mechanism that emits light by receiving a voltage from a predetermined power source, and may include a high voltage discharge lamp (HID), a halogen bulb, a light emitting diode (LED), or the like. The light source 104 is received in the reflector unit 112.

The reflector unit 112 accommodates the light source 104 and reflects the light emitted from the light source 104 in all directions by the main reflector 113 therein. In general, the main reflector 113 of the projection type consists of part of an ellipsoid, where the light source 104 is located at one of the two foci of the ellipse (first focal point).

The shields 130 and 140 have a specific cut-off pattern and block a portion of the shield 130 to form a downward beam pattern of light reflected forward by the main reflector 113. The shields 130 and 140 are driven by the step motor 161 directly connected to the lead screw 150. The lead screw 150 forms a bolt-nut coupling with the female threaded portion 131 of the first shield 130, and the end portion 151 of which the thread is not formed in the lead screw 150 is the second shield 140. It is fitted to the shield cover 120 so as to be rotatable by the lead screw bearing (108e) passing through the inside of the hollow rotation guide portion (141, 142). In this case, the hollow rotation guide parts 141 and 142 are inserted into the circular hole 123 of the shield cover 120 and the circular hole 196 of the side cover 195 via the bearings 108b and 180c. In addition, the side cover 195 is fastened to the side of the shield cover 120 and the shield actuator assembly 160 by bolts. In addition, the slider 132 of the first shield 130 is fitted into the guide slot 121 of the shield cover 120 via the bearing 122.

In the downlight mode, the light reflected from the main reflector 113 and directed toward the lower side of the second focus (16 in FIG. 1) is blocked by the shields 130 and 140. Light that is not blocked by the shield forms a downlight pattern or an uplight pattern according to a cut off pattern of an appropriate shield. In the present invention, the shields 130 and 140 are inclined by a predetermined angle with respect to the optical axis, and in particular, an inverse reflector (143 in FIG. 17) is formed on the outer surface of the second shield 140, that is, the light source side surface. The light blocked by the shields 130 and 140 reflects toward the additional reflector 170.

The rotation frame 190 rotates about a rotation axis on a vertical line formed by the lower rotation shaft 192 and the upper rotation shaft 191. The lower axis of rotation 192 receives rotational force from the rotary actuator assembly 185. The upper rotating shaft 191 is inserted into the circular hole 115 of the upper bracket 114 via the bearing 108a.

A circular hole 193 is provided at a position separated by a predetermined offset (distance of the arm 99 in FIG. 18, R + r) from the lower rotating shaft 192, and the circular hole 193 has an additional reflector shaft. 175 is inserted through the bearing 108d.

On the other hand, an opening 103 is formed below the lens fixing part 102 to allow the light reflected from the additional reflector 170 to travel left or right. The lens 100 is coupled to the front of the lens fixing part 102. For example, the lens 100 is an aspherical lens, and is reflected by the main reflector 113 and refracts the light reached without being blocked by the shields 130 and 140 to be substantially forward. In addition, the four corners of the rear of the rotating frame 190 is provided with a screw hole for fastening the bolts with the rotating frame 190 and the reflector unit 112.

The lower rotation shaft 192 is directly connected to the step motor 186 included in the rotational actuator assembly 185 through the center hole 182 of the sun gear 181. Therefore, the rotation frame 190 may be rotated (by θ in FIG. 19) by the step motor 186. In addition, an additional reflector shaft 175 and a bearing 108d are fitted in the circular hole 193. By the same principle as in FIG. 18, the planetary gear 176 rotates and revolves around the sun gear 181 according to the rotation of the rotation frame 190. That is, the additional reflector 170 rotates at an angle greater than the angle at which the rotation frame 190 is rotated (θ + φ in FIG. 19), and the light reflected from the reverse reflector (143 in FIG. 17) is reflected in the additional reflector 170. ) Is reflected in the rotated direction.

Polymer bearings may be used as the bearings 108a, 108b, 108c, 108d, 108e, 122, and 182 in the lamp assembly 1000, but are not necessarily limited thereto. .

Although embodiments of the present invention have been described above with reference to the accompanying drawings, those skilled in the art to which the present invention pertains may implement the present invention in other specific forms without changing the technical spirit or essential features thereof. I can understand that. Therefore, it should be understood that the embodiments described above are exemplary in all respects and not restrictive.

As described above, according to the present invention, by changing the beam pattern of the headlamps appropriately according to the various driving environment in which the vehicle travels, and allowing the driver to secure a viewing angle suitable for various road conditions, safety during vehicle driving There is an effect that can be planned.

Claims (9)

A lamp shield driving device for shielding a part of the light provided by the light source with a shield, a lens for concentrating the blocked light forward, and a housing for accommodating the light source and the lamp shield driving device. The lamp shield driving device A shield having a predetermined cut off pattern; A lead screw forming a bolt-nut coupling with the shield; And An actuator for rotating the lead screw, And at least two different beam patterns are formed by linear or rotary movement of the shield as the lead screw rotates. The method of claim 1, And the shield includes a shield having two different cut-off shapes. The method of claim 2, wherein the lamp shield driving device The lamp assembly further comprises a shield cover is formed with a guide slot for guiding the linear and rotational movement of the slider provided in the shield. The method of claim 3, wherein the guide slot is A closed slot for guiding the linear movement of the slider; And And an open slot for guiding the rotational movement of the slider. The method of claim 4, wherein The current beam pattern forms two or more downlight beam patterns by the linear movement of the slider, and the lamp assembly is converted into an upright pattern by the rotational movement of the slider. The method of claim 5, One of the shields is supported by a return spring, and the lamp returns to the position of the downlight pattern by the elasticity of the return spring when the rotational force of the actuator is released at the position of the upward light pattern by the rotational motion. assembly. The method of claim 1, An inverse reflector reflecting the portion of the light provided from the light source by the shield substantially downward; And And a further reflector reflecting forwardly the light reflected by the reverse reflector. The method of claim 7, wherein And the additional reflector rotates at an angle greater than the angle at which the light source rotates according to the tooth ratio of the planetary gear provided on the shaft of the additional reflector and the sun gear that is tooth-connected with the planetary gear. A lamp shield driving apparatus for providing various beam patterns by actively blocking a part of light provided by a light source by a shield, A shield having a predetermined cut off pattern; A lead screw forming a bolt-nut coupling with the shield; And An actuator for rotating the lead screw, And at least two different beam patterns are formed by linearly or rotating the shield according to the rotation of the lead screw.

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