CZ297958B6 - Headlight for motor vehicles - Google Patents

Abstract

In the present invention, there is disclosed a headlight for motor vehicles comprising a reflector (1) for directing a light beam, a light source (2), an opaque shield (9) serving for screening a portion of the reflector (1) an adjustable actuating member (5), and an electromechanical fixing member (6) for fixing position of the light source (2) or the reflector (1), wherein said adjustable actuating member (5) is rotatably coupled with a light source (2) holder (3) rotatable about a mechanical axis (4), whereby said reflector (1) is fixedly coupled to said electromechanical fixing member (6) tat can be coupled with the light source (2) holder (3) in order to rotate the light source (2) in close proximity of the reflector (1) axis (8) or with a headlight housing (7) in order to rotate the light source (2) below the reflector (1) axis (8), whereby said opaque shield (9) is located on the light source (2) holder (3) or said reflector (1). Said adjustable actuating member (5) is represented by an electric motor, a stepping motor, a hydraulic or pneumatic drive and said electromechanical fixing member (6) is represented by an electromechanical brake or an electromagnet. Said light source (2) is represented by a halogen lamp spiral with transverse or axial location of fiber or transversely or axially situated gas tube arc.

Description

Technical field

BACKGROUND OF THE INVENTION The present invention relates to a headlamp of the reflector type for motor vehicles, in which a mechanical structure for changing the function of the headlamp in order to change the spatial distribution of light is solved.

In the function of the passing beam, the beam of converging light extends below a significant threshold of light and darkness; in the function of the driving beam, the light beam consists essentially of parallel rays.

BACKGROUND OF THE INVENTION

By changing the position of the light source relative to the reflector, it is possible to change the beam of rays emanating from the reflector. By moving the light source from the focus of the parabolic reflector, the reflected beam ceases to be collimated.

By changing the vertical position of the source relative to the parabolic reflector, the light beam coming from the parabolic reflector is also shifted vertically. Based on these physical principles, a series of double-filament lamps are used that utilize the geometric distribution of the filaments for the high beam and low beam functions. The headlamp function can be changed by changing the position of the light source relative to the reflector.

When using a gas-discharge light source, it is necessary to use an automatic adjustment system consisting of sensors evaluating the angle of inclination of the vehicle, a control unit that evaluates the input signals from the sensors and an adjusting actuator. The adjusting actuator swivels the entire reflector around the main point in order to maintain correct adjustment of the vertical inclination of the passing beam interface according to the requirements of the Regulation.

The prior art of mechanisms for changing the position of a light source with respect to a reflector is the solution of an additional adjusting actuator located in the headlight (U.S. Pat. Nos. 5,769,525, DE 19 741 377, DE 19 710 632). The disadvantage of these solutions is the use of two adjusting actuators, thereby increasing the installation space in the headlight necessary for mounting the external adjusting actuator, the need to simultaneously adjust both the parabolic reflector and the adjusting actuator itself. The adjusting actuator itself, which is not installed in the area of the parabolic reflector, is also prone to shock.

SUMMARY OF THE INVENTION

The disadvantage of an external adjusting actuator is eliminated according to the invention for a headlamp consisting of a reflector of approximately parabolic shape, a light source, an opaque aperture, an adjusting actuator allowing the vertical adjustment of the reflector to correct the headlamp according to the passing beam requirements and electromechanical fixation a member for mechanical fixation of the headlamp function. The change in the function of the headlamp is due to a change in the relative position of the light source and the reflector. Inside the reflector is located near its optical axis a light source, which is firmly attached to the light source holder. An opaque screen may be placed on the light source holder itself to prevent the rays from coming from the bottom of the light source to be incident, or the opaque screen may be fixedly attached to the reflector.

The whole system includes a mechanical axis around which the headlight reflector rotates and an axis around which the light source itself rotates, the two axes coinciding and therefore can be rotated with the light source or reflector by a single adjusting actuator so that the actuator is rotatable. The light source is rotatable by a mechanical axis, and a fixation member coupled to the reflector is coupled to the light source holder to rotate the light source near the reflector axis or the headlight housing to rotate the light source below the reflector axis. The adjusting actuator may be an electric motor, a stepper motor, a hydraulic or a pneumatic drive. The electromechanical fixation element is an electromechanical brake or electromagnet, acting as a mechanical lock for both headlamp functions.

For the dipped beam function, the electromagnet shaft is inserted into the light source holder, whereby the reflector is fixedly connected to the light source. This connection transmits movement from the adjusting actuator to the reflector, which can be used to properly adjust the vertical inclination of the passing beam interface according to the requirements of the regulation. The light source is near the optical axis of the reflector.

For the main beam function, the reflector is moved to a position where, after applying electrical voltage to the electromagnet, it can be moved by the shaft of the magnet to a predefined position to lock the parabolic reflector relative to the headlight housing while releasing the coupling between the light source holder and the reflector itself. Subsequent movement of the adjusting actuator results in movement of the light source relative to the parabolic reflector. The rotation of the light source is fast and smooth and there is no shaking of the light source. The light source is below the optical axis of the reflector.

The change of function from high beam to dipped beam is done by reversing the light source towards the reflector, then switching off the voltage on the electromagnet causes the light source holder to lock with respect to the reflector by means of a spring element acting on the magnet shaft.

BRIEF DESCRIPTION OF THE DRAWINGS

BRIEF DESCRIPTION OF THE DRAWINGS The invention is illustrated by the accompanying drawings. Fig. 1 shows a mechanical scheme of the positioning mechanism in the rear view in the function of the passing beam, Fig. 2 shows a side view of the mechanism in the same light function, Fig. 3 shows the positioning mechanism in the rear view in the function of the high beam 4 shows a side view of the mechanism with the same light function.

DETAILED DESCRIPTION OF THE INVENTION

Figure 1,2,3,4 shows a mechanical diagram of the headlight in the rear and side views for both headlamp functions. The system consists of a reflector 1 of approximately parabolic shape, a light source 2, an opaque orifice plate 9, an adjusting actuator 5 allowing the vertical adjustment of the reflector 1 to be adjusted correctly to meet the requirements of the passing beam regulations and the electromechanical fixation member 6 fixation of headlight function.

The change in function of the headlamp is given by changing the relative position of the light source 2 and the reflector 1. Inside the reflector 1 is located near its optical axis 8 a light source 2, which is fixed by means of resiliently deformable parts in the holder 3 of the light source 2. An opaque screen 9 can be placed on the light source holder 2 itself. from the bottom of the light source 2 or this opaque screen 9 can be fixedly attached to the reflector 1. The whole system comprises a mechanical axis 4 around which the headlight reflector 1 rotates and an axis around which the light source 2 itself rotates. rotate with the light source 2 or the reflector 1 by means of a single adjusting actuator 5 so that the actuator 5 is rotatably connected to the light source holder 2, rotatable about a mechanical axis 4, and the fixation member 6 is fixedly connected to the reflector 1 3 light sources 2 for

Rotating the light source 2 near the axis 8 of the reflector 1 or with the headlight housing 7 to rotate the light source below the axis 8 of the reflector f. Due to its precise positioning, the adjusting actuator 5 can rotate the light source holder 3 about the main axis. The rotation of the reflector 1 is made possible by an electromechanical fixation member 6 fixedly fixed to the reflector f. This electromechanical fixation member 6 may be an electromagnet performing a mechanical lock function for both headlamp functions.

For the dipped beam function, the electromagnet shaft is inserted into the light source holder 3, thereby firmly connecting the reflector 1 to the light source 2. This connection transmits movement from the adjusting actuator 5 to the reflector 7, which can be used to correctly adjust the vertical inclination of the passing beam as required by regulation. The light source 2 is near the optical axis 8 of the reflector 7.

For the main beam function, the reflector 1 is moved to a position where, after applying electrical voltage to the electromagnet, the shaft of the electromagnet can be moved to a predefined position in order to lock the parabolic reflector 1 relative to the headlight housing 7. and the reflector 1 itself. Subsequent movement of the adjusting actuator 5 results in the movement of the light source 2 relative to the parabolic reflector 1. The rotation of the light source 2 is fast and smooth and there is no shaking of the light source 2. The light source 2 is here below the optical axis 8 of the reflector .

The change of function from high beam to dipped beam is performed by reversing the light source 2 towards the optical axis 8 of the reflector 1, then switching off the voltage on the electromagnet causes the light source holder 3 to lock relative to the parabolic reflector 1 by a spring element acting on the electromagnet shaft. the vertical inclination of the interface as required by the Regulation.

PATENT CLAIMS

Claims (6)

PATENT CLAIMS A headlamp for a motor vehicle, comprising a reflector for directing a light beam, a light source, an opaque aperture for deflecting a part of the reflector, an adjusting actuator and an electromechanical fixture for fixing the position of the light source or reflector, characterized in that the actuator (5) is pivotally connected to a light source bracket (3), rotatable about a mechanical axis (4), and a fixation member (6) is fixedly coupled to the reflector (6) with the light source bracket (3) to rotate the light source (2) near the axis (8) of the reflector (1) or with the headlight housing (7) to rotate the light source (2) below the axis (8) of the reflector (1). Headlamp according to claim 1, characterized in that an opaque screen (9) is arranged on the light source holder (3) or on the reflector (1). Headlamp according to claim 1, characterized in that the adjusting actuator (5) is an electric motor, a stepper motor, a hydraulic or a pneumatic drive. Headlight according to claim 1, characterized in that the electromechanical fixing member (6) is an electromechanical brake or an electromagnet. Headlight according to claim 1, characterized in that the light source (2) is a spiral halogen lamp with a transverse or axial filament. Headlight according to claim 1, characterized in that the light source (2) is a transversely or axially arranged arc of the gas discharge lamp.