JP2827147B2 - Variable light distribution type lamp for reflector driven vehicle - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reflector-driven variable light distribution type lamp for a vehicle having a structure in which a turning operation of a vehicle is sensed and a headlamp is controlled so as to obtain a light distribution suitable for running conditions. is there.

[0002]

2. Description of the Related Art Conventionally, a turning operation of a vehicle is sensed by a steering sensor or the like, and a reflector of a projector lamp is moved right and left with respect to a lens and a shade.
Various light distribution variable headlamps having a structure in which the light distribution by the reflector is swung right and left to change are proposed. In this type of variable light distribution type headlamp, a structure is required to slightly change the direction of the irradiation light beam when the light distribution is swung right and left, and a guide rail and an inclined rotary support shaft are used. It constitutes a support structure for the reflector.

[0003] That is, the one shown in FIG.
Are supported so as to slide along guide grooves 53 formed in a guide wall 52, and the reflector 50 is swingably displaced in the direction of arrow A by a motor 54. The reflector 50 which bends the shape of the guide grooves 53, 53 in the vertical direction and slides and displaces along the guide grooves 53, 53 simultaneously in the horizontal direction (arrow A) and the vertical direction (arrow B). And the light distribution pattern of the irradiation light beam is controlled.

FIG. 8 shows a reflector 50.
Is pivotally supported in the direction of arrow A by a rotation shaft 55 inclined (inclination angle θ) with respect to the optical axis, and the reflector 50 is swingably driven by a motor 54. Alternatively, when swinging to the right (arrow A), a curved swing trajectory (arrow C) is formed which is simultaneously displaced in the vertical direction due to the inclination of the rotation shaft 55, and the light distribution pattern of the irradiation light beam is controlled. ing.

[0005]

However, this type of headlamp variable light distribution mechanism has a complicated structure, so that the movable portion becomes heavy, and the center of gravity is moved from the rotation center of the rotational movement. Since the distance is large, the moment of inertia becomes large, so that there is a disadvantage that the response time is delayed.
In addition, since it is necessary to ensure accurate movement, precise and high-precision processing accuracy is required, such as design processing of a guide groove and design processing of an inclination angle of a rotating shaft, and there has been a problem such as an increase in production cost. .

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and is a reflector-driven vehicle light distribution that is robust and simple in structure as a vehicle lamp, and that enables highly accurate light distribution control. It is an object of the present invention to provide a variable lamp.

[0007]

SUMMARY OF THE INVENTION In order to achieve the above object, a reflector-driven variable light distribution type vehicle lighting device according to the present invention comprises an illumination light beam at a position on an optical axis in front of a reflector provided with a lighting bulb. In a lamp in which a shade and a lens that partially block the light are arranged, and the reflector is displaced in a direction perpendicular to the optical axis with respect to the lens to change the direction of the irradiation light beam, the reflectors are arranged side by side. The gist of the present invention is that a suspension is swingably supported in a horizontal direction through a pair of links, and the reflector is driven to be displaced leftward or rightward by reflector driving means capable of driving control.

[0008]

According to the above structure, the reflector is suspended by the pair of links so as to be swingable in the left-right direction, and the swinging portion is driven and displaced by the reflector driving means. Displacement to the left and right according to the characteristics of the link causes displacement along an arc-shaped trajectory having a center point at the top. As a result, when the irradiation light beam is swung to the left or right, the larger the swing angle is, the more the irradiation light beam is deflected below the horizontal level, and the reflector drive that controls in conjunction with the rotation angle of the steering of the automobile When controlled by the means, it becomes possible to change the direction of the irradiation light beam in accordance with the running conditions of the automobile.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a reflector-driven vehicle variable light distribution type lamp according to the present invention will be described below with reference to FIGS. FIGS. 1 and 2 are perspective views of a principle device embodying the present invention, and a lamp frame 1a instead of a lamp housing 1 has a lens 2 such as a collimator lens located at the front end of an optical axis L. A lighting bulb 6, which is fixedly held via a lens frame 3, has a shade 4 erected behind the lens 2, and a light source 6 via a reflector frame 5 erected behind the shade 4. Is mounted to support the reflector 7.

The position of the lens 2, the shade 4 and the reflector 7 is determined by disposing a bulb 6 at a first focal position F1 of a parabolic reflecting mirror 8 formed on the inner surface of the reflector 7, And the focal position of the lens 2 substantially coincide with each other, and the shade 4 is arranged between the first focal position F1 and the second focal position F2 to block a part of the light beam emitted from the bulb 6. Has become.

The shade 4 includes a reflector frame 5
And a pair of links 9, 9 with respect to the upper frame portion.
And a support structure in which the lower end 7b is slidably sandwiched between the guide plates 10 and supported so as to swing freely in the left-right direction. Both ends of link rods 11 having the same length are rotatably connected via pin shafts 12.

Reference numeral 13 denotes a driving mechanism of the reflector 7, and a swing arm 15 is axially mounted on an output shaft end of an actuator 14 such as a rotary solenoid fixed to the reflector frame 5, and the swing is performed. Arm 15
And the front end of the reflector 7 is connected via a connecting rod 16 to drive the actuator 14 back and forth (arrow X).
Thereby, the reflector 7 is displaced along the locus indicated by the arrow Y.

The valve 6 is inserted into the reflector 7 through a through hole formed at the rear of the reflector 7, and is fixed by a set spring 17 so as to press the flange 6a against the outer edge of the through hole. And shade 4 again
Form a light-shielding edge 18 along the cut line of the light beam.

Next, the operation of the reflector-driven variable light distribution type vehicle lighting device having the above-described structure will be described with reference to FIGS. When the actuator 14 is driven (arrow X),
The reflector 7 suspended on the links 9, 9 via the swing arm 15 and the connecting rod 16 swings along an upwardly curved swing locus (arrow Y) due to the pivoting movement of the links 9, 9. Dynamically displaces. The oscillating trajectory Y has an arc shape having a center point on the upper side. Therefore, the irradiation light beam transmitted through the lens 2 has the center of the light beam drawn as an arc-shaped trajectory S having a center point on the lower side. Point P moves.

(1) Running on a straight road (see FIG. 3) When running on a straight road, the actuator 14 is driven to the neutral position so that the optical axis of the reflector 7 coincides with the axis of the lens 2. The pattern of the irradiation light beam is shown in FIG.
As shown in the figure, the center point P of the light beam is near the vertical axis V and the horizontal axis H. The shade 4 is located above the horizontal axis H.
It has been cut by.

(2) Traveling on a Left Curve Road (See FIG. 4) When traveling on a left curve road, the optical axis of the reflector 7 moves to the right with respect to the axis of the lens 2 (see FIG. 4A). In this way, the rotational drive of the actuator 14 is controlled in accordance with the rotation angle of the steering. Fig. 4
As shown in (b), since the center point P of the light beam is displaced leftward from the vertical axis V and moves along the locus indicated by S, the central point P is displaced downward from the horizontal axis H as the steering rotation angle increases. The portion above the horizontal axis H is cut by the shade 4. (In addition, when traveling on a right curve road, it operates in the opposite direction.)

The above-mentioned principle device is applicable to a headlamp as shown in FIGS. 5 and 6, for example.
The above-described structure is arranged in the housing 1 of the headlamp, and is housed in a lamp room 20 covered by an outer lens 19. (The description of the structure is omitted with the same reference numerals as in the description of the principle device described above.)

[0018]

According to the reflector-driven variable light distribution type vehicle lighting device of the present invention, as described above, the reflector is suspended by a pair of links so as to be swingable in the left-right direction, and the swing portion is driven and displaced by an actuator. With this configuration, when the reflector is displaced left and right according to the characteristics of the link, the reflector is displaced along an arc-shaped trajectory having a center point at the top. As a result, it is possible to obtain a preferable light distribution trajectory of the irradiation light beam with a very simple structure called a link, and when controlled by an actuator that is controlled in conjunction with the rotation angle of the steering of the vehicle, an optimum light distribution suitable for the driving conditions of the vehicle is obtained. It has a feature that light distribution can be secured, and the effect obtained by implementing the present invention is extremely large.

[Brief description of the drawings]

FIG. 1 is a front perspective view of an embodiment showing the structural principle of a reflector-driven vehicle variable light distribution type lighting device according to the present invention.

FIG. 2 is a perspective view as viewed from the rear.

FIG. 3A is a rear view of the lamp while traveling on a straight road, showing the operation of the lamp, and FIG.

FIG. 4 is a rear view of the lamp when traveling on a left curve road showing the operation of the lamp, and FIG.

FIG. 5 is a partially cutaway plan view showing one embodiment of a headlamp equipped with the reflector-driven vehicle variable light distribution type lighting device of the present invention.

FIG. 6 is a partially cutaway side view of the headlamp.

FIG. 7 is an exploded perspective view showing a first example of a conventional reflector-driven vehicle variable light distribution type lamp.

FIG. 8 is a plan sectional view showing a second example of a conventional reflector-driven vehicle variable light distribution type lamp.

[Explanation of symbols]

 2 Lens 4 Shade 5 Reflector frame 6 Valve 7 Reflector 9 Link 10 Guide plate 13 Reflector drive mechanism 14 Actuator 15 Swing arm 16 Link rod

Continuation of front page (56) References JP-A-5-139203 (JP, A) JP-A-1-286202 (JP, A) JP-A-2-5205 (JP, U) JP-A-2-16503 (JP) , U) Hikaru Hei 3-91611 (JP, U) (58) Field surveyed (Int. Cl. ⁶ , DB name) F21M 3/20

Claims (1)

(57) [Claims] 1. A shade and a lens which block a part of an irradiation light beam are arranged at an optical axis position in front of a reflector, and the direction of the irradiation light beam is changed by displacing the reflector with respect to the lens in a direction orthogonal to the optical axis. In the lighting device, the reflector is swingably supported in a lateral direction via a pair of links arranged side by side in a lateral direction, and the reflector is driven to be displaced left or right by reflector driving means capable of driving and controlling the reflector. A reflector-driven variable light distribution type vehicle light characterized by the above-mentioned configuration.