JP3752645B2 - Method and apparatus for measuring the deviation of a passing light of a headlight for an automobile - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention measures a cut line and an elbow point of a passing light of a headlight, draws a horizontal cut line and a rising virtual line of a predetermined angle, aligns the horizontal cut line with a horizontal line provided on a monitor screen, The present invention relates to a method and an apparatus for measuring a deviation of a passing light of a headlight for an automobile intended to be adjusted so as to match a vertical reference line on the monitor screen.
[0002]
[Prior art]
Conventional headlight testers have only measured the cut line for passing lights (No. 7-43632).
[0003]
As for the display of the cut line, a method of confirming the projected image on a light distribution screen or the like, a method of capturing the light distribution with a CCD camera and displaying it on a CRT, etc. Or a method of drawing light distribution data captured by a CCD camera or the like by computer processing or the like and expressing it on a CRT or the like.
[0004]
[Problems to be solved by the invention]
According to the conventional method, the cut line of the passing lamp is almost corrected, but the elbow point is not taken into consideration, so if there is a deviation of the elbow point, it will deviate from the cut line by the deviation amount. There is a problem that glare cannot be prevented depending on the position of the oncoming vehicle.
[0005]
Also, even if the cut line is projected on a light distribution screen or the like, the boundary between light and dark is not clear, so visual confirmation is poor in workability, and before the cut line is processed, the shape is insufficiently shaped and data processing takes time. In addition, there is a problem that the CPU processing and the like are accompanied with an increase in cost as well as being lost in real time.
[0006]
[Means for solving the problems]
However, according to the present invention, the elbow point of the cut line can be detected and corrected, so that the deviation of the elbow point is eliminated and the workability of checking and correcting the cut line is improved, thereby improving the conventional problems.
[0007]
That is, the invention of the method draws a horizontal line by detecting a horizontal cut sensor at a light distribution cut line position that is a predetermined distance away from a passing light of a headlight for an automobile, and obtains an elbow point by detecting an elbow point sensor. pull the rise imaginary line passing lamps at a predetermined angle, a method for measuring the deviation of the passing lamps of automobile headlights characterized by the Turkey to drawing on monitor, the angle of the rising imaginary line passing lamps Is optional. Further, the invention of the apparatus is an apparatus comprising a light distribution at a predetermined distance ahead of the headlight, a Fresnel lens capable of reproducing an approximate light distribution, and a screen plate for projecting the light distribution. A sensor for measuring the cut line and a sensor plate with a sensor for measuring the elbow point of the passing light, and means for drawing the rising virtual line at a predetermined angle on the monitor from the cut line and the elbow point. A device for measuring the deviation of a passing light of a headlight for an automobile, characterized in that the screen plate and the sensor plate are moved manually or automatically.
[0008]
The predetermined distance in the invention is, for example, 10 m.
[0009]
The movement for aligning the elbow point with the intersection of the reference lines is a screen plate or a sensor plate, and the point is to know the correction direction and distance accurately. Therefore, the amount of movement is displayed at a position that is easy to see, and a conventionally known device is used for movement of the screen and the display of the amount of movement.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
The present invention draws a horizontal line at the measured cut line position, draws a rising virtual line of the passing light at a predetermined angle at the measured elbow point, and determines the intersection point of the horizontal reference line and the vertical reference line on the screen. This is a method and an apparatus for measuring a deviation of a passing light of a headlight for an automobile that displays a deviation by combining with.
[0011]
【Example】
An embodiment of the present invention will be described with reference to the drawings. In FIG. 1, a projection light beam 10 of a passing light 1 of a headlight of an automobile is received by a Fresnel lens 2 and condensed, reflected by a reflection plate 3 and projected onto a screen plate 4. The screen plate 4 is provided with elbow point sensors 5a, 5b, and 5c at 45 degrees with respect to the horizontal line 6 so that the sensor 5b is arranged at the center point. The sensors 5a, 5b, and 5c are slightly spaced from each other. Have taken. On the horizontal line 6, horizontal cut sensors 7a, 7b, 7c are arranged close to each other at right angles (perpendicular). In the figure, 8a and 8b: 9a and 9b are measuring sensors for running lights.
[0012]
In the embodiment, the projection light beam 10 of the passing lamp 1 is reflected by the reflection plate 3 and projected onto the screen plate 4. Therefore, the horizontal line 11 is drawn at the position detected by the horizontal cut sensors 7a, 7b and 7c (FIG. 3), and then the virtual line 12 rising for 15 minutes is drawn from the elbow points obtained by the elbow point sensors 5a, 5b and 5c. The cut line 15 is used. The screen plate 4 is moved so that the elbow point L overlaps the cut line 15 at the intersection 0 of the horizontal reference line 13 and the vertical reference line 14 of the passing lamp 1 provided on the screen plate 4. The amount of movement of the screen plate 4 in the horizontal direction and the vertical direction until the position where the elbow point L and the intersection point 0 overlap as described above is the correction amount of the passing lamp 1.
[0013]
According to the embodiment, although the screen plate 4 is moved, the shift amount can be displayed even if the sensor plate to which each sensor is attached is moved.
[0014]
Since the isoillumination curve 16 shown in FIG. 5 is drawn on the screen plate 4, this is image-processed to obtain a cut line 15 having an elbow point L as shown in FIG.
[0015]
【The invention's effect】
Since the present invention measures and corrects the elbow point, there is an effect that there is no shift of the cut line due to the shift of the elbow point. In addition, a horizontal cut line and a virtual line based on elbow point measurement are provided, and this is aligned with the horizontal reference line and vertical reference line to detect the amount of misalignment of the passing lamp. And the structure is remarkably simplified.
[Brief description of the drawings]
FIG. 1 is a conceptual diagram showing the relationship between reflection of headlight light and a screen plate according to the present invention.
FIG. 2 is a diagram similarly showing each sensor arrangement.
FIG. 3 is an exemplary view of a cut line.
FIG. 4 is an exemplary view of a screen plate.
FIG. 5 is an isoilluminance curve of a passing lamp projected on a screen.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Passing light 2 Fresnel lens 3 Reflecting plate 4 Screen board 5a, 5b, 5c Elbow point sensor 6 Horizontal line 7a, 7b, 7c Horizontal cut sensor 8a, 8b, 9a, 9b Traveling light sensor 10 Projected light 11 Horizontal line 12 Virtual line 13 Horizontal reference line 14 Vertical reference line 15 Cut line

Claims (3)

A horizontal line is drawn by detecting the horizontal cut sensor at the cut line position of the light distribution that is a predetermined distance away from the passing light of the headlight for automobiles, and the elbow point is obtained by detecting the elbow point sensor , passing at a predetermined angle. pull the rising virtual line of the lamp, the measuring method of the deviation of passing lamps of automobile headlights characterized by the Turkey to drawing on monitor.   2. The method for measuring a deviation of a passing light of an automobile headlight according to claim 1, wherein the angle of the rising virtual line of the passing light is arbitrary. In a device comprising a light distribution at a predetermined distance ahead of the headlight, a Fresnel lens that can reproduce an approximate light distribution, and a screen plate that projects the light distribution, the cut line of the passing light is measured on the screen plate. A sensor and a sensor plate with a sensor for measuring the elbow point of a passing light, and have means for drawing a virtual line rising from the elbow point at a predetermined angle on the monitor. An apparatus for measuring the deviation of a passing light of a headlight for an automobile, wherein the sensor plate is moved manually or automatically.

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