JP2012127930A - Method for measuring vehicular headlight and device thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a headlight tester for simulating and confirming illumination distribution of a headlight, or a vehicular headlight, photographing a shape image of the headlight, determining a coordinate position of the headlight by moving the headlight tester and automatically facing the headlight to the vehicle.SOLUTION: The headlight tester for simulating and confirming the illumination distribution of the headlight, or the vehicular headlight, photographs the shape image of the headlight, finds the coordinates of the headlight shape from a screen on a monitor, determines the shape of the headlight based on moving information of the headlight tester and the coordinates to determine the face-to-face position, and automatically moves the headlight tester to the face-to-face position to perform the measurement.

Description

  The present invention relates to a headlamp shape grasping and facing method and apparatus for measuring irradiation light of a headlamp lamp as a headlight in a vehicle headlamp test apparatus (headlight tester).

  The vehicle headlight lamp measurement test is a photometer for a measurement reference in which a screen is arranged at a distance of 10 m in front of the reference headlight lamp, and a illuminance distribution pattern and illuminance projected from the reference light are fitted with a measurement reference filter. It is determined using the measured luminous intensity distribution as a reference value. The test measurement of the headlight of the vehicle to be measured by this method requires a large space. Therefore, a headlight tester for simulating and confirming the irradiation distribution of the headlight is separated from the vehicle to be inspected by 1 m, and the headlight tester is arranged and measured. The lamp illuminates and illuminates the condensing lens provided in front of the headlight tester, measures the lamp shape image and its illumination distribution, and moves the headlight tester to illuminate the lamp. Measuring the distribution has been put into practical use.

  In a headlight tester that simulates and confirms the light intensity distribution of a lamp that is a vehicle headlight, the method for measuring the illuminance distribution of the lamp is directed toward a condenser lens in front of the headlight tester that is disposed at a predetermined distance from the lamp that is a headlight. Turn on the lamp. At that time, the optical axis of the lamp to be measured needs to be perpendicularly incident on the condenser lens in front of the headlight tester, and the distance between the condenser lens in front of the headlight tester and the lamp to be measured is a predetermined 1 m. It is necessary. Setting the incident angle of the lamp with respect to the vehicle is called vehicle alignment, and the vehicle alignment operation is a headlight tester that confirms that the incident angle of the lamp is vertical incidence and the angle of the headlight tester according to the inclination of the vehicle It is a work to correct. The lamp facing operation is an operation for setting the distance between the measured lamp and the headlight tester to 1 m which is a predetermined distance after correcting the angle of the vehicle facing and arranging the measured lamp image at the center of the image. The light intensity distribution irradiated by the lamp after the work of the vehicle facing and the lamp facing is measured to contribute to a safe vehicle operation standard.

  Although the headlight tester is required to face the condenser lens provided on the front surface of the headlight tester with respect to the vehicle to be measured, the vehicle entering the vehicle is often non-facing. The deviation from the front of the vehicle is confirmed by visual confirmation of the front and rear tires, but in a vehicle with a wheelbase of 2.8 m, the deviation of the tire around 100 mm corresponds to 2 ° and an error occurs in the light intensity distribution 10 m ahead. Moreover, the visual confirmation of the shift is merely a guideline because the front-rear width of the vehicle changes depending on the front-rear tread width and tire width. There is a vehicle inspection place that is perpendicular to the condenser lens surface of the headlight tester, but it is limited to a part. Therefore, the headlight tester has a headlight tester micro-rotation mechanism for correcting the inclination of the vehicle to face the vehicle.

  Conventionally, the headlight tester has been devised for confronting this. (Patent Document 1, Patent Document 2, Patent Document 3).

  Patent Document 1 is a method in which a lamp is turned on and irradiated from a lamp toward a screen in a headlight tester, and the gantry is moved so that the optical axis thereof is at the center position of the screen. Patent Document 2 relates to the internal structure of a headlight tester, in which a light distribution image and a lamp image are separated by a half mirror. The image is captured by a video camera and visually recognized by a monitor. Patent Document 3 is characterized in that, apart from the video camera in the headlight tester, the optical axes of two cameras are mounted so as to intersect one point at a predetermined distance, and the predetermined measurement distance of the lamp is grasped. is there.

Japanese Unexamined Patent Publication No. 63-019529 JP 2001-013041 A JP 2004-340890 A

  The patent proposals of the conventional apparatus and method as described above are not sufficient as a function for setting the vehicle facing distance and the lamp facing angle of the headlight tester of the vehicle. The method using two cameras for distance setting has two functions: vehicle facing measurement distance setting and lamp facing angle, but two distance measuring cameras are required separately from the measuring camera in the headlight tester. Is complicated. An object of the present invention is to obtain the facing distance information and the lamp angle facing function at the same time without the need for a distance information capturing camera different from the camera that captures the illumination distribution of the lamp.

The present invention has been made in view of the necessity and situation as described above, and the vehicle that enters the vehicle is not directly facing the vehicle. Therefore, in order to correct the vehicle inclination to the headlight tester, It is necessary to obtain the tilt angle. A new headlight tester that has the function of slightly rotating the headlight to give a correction angle so as to face the vehicle according to the obtained vehicle tilt information and the function of moving and arranging the headlight tester at a predetermined measurement distance. It is characterized by the provision of a system that can be provided without adding devices and that can be automatically adjusted.

  In order to achieve the above object, the headlight tester is used to measure the irradiation characteristics of a headlight lamp with a headlight tester so that a lamp angle alignment function and a lamp measurement distance setting function can be obtained simultaneously. A three-axis movement of a device that moves in a direction parallel to the left and right lamps, a device that moves in a direction away from or approaches the left and right lamps, and a device that moves in the lamp height direction to match the lamp height of the vehicle It has a structure in which a headlight tester is mounted on a gantry, and has a mechanism that rotates slightly around the height direction adjusting shaft. It comprises a display and a control panel for monitoring a built-in video camera image that captures a lamp image when the lamp light is irradiated and a light distribution image of the lamp.

FIG. 1 shows an overall apparatus for measuring the lamp characteristics of a vehicle headlamp according to the present invention. The headlight tester 101 measures the irradiation light distribution characteristics of the lamps 112 and 113 that are headlamps of the vehicle 114 to be measured. The axis moving in parallel with the left and right headlamp lamps is the x-axis 104, the moving axis moving away from or approaching the lamp is the y-axis 105, and the axis for adjusting the height in the lamp height direction is the xy plane. The z axis 106 is orthogonal. The headlight tester is mounted on a gantry (103a, 103b) that freely moves on these three axes to measure the lamp. The ground has a structure with little unevenness, and the inclination of the vehicle may mainly take into account the angle around the z axis. For this reason, the headlight tester main body 101 has a mechanism that slightly rotates around the z axis. In FIG. 1, arrows (107, 108, 109) indicating respective coordinate axes and movable directions are shown. When measuring the lamps 112 and 113, the headlight tester 101 moves from the standby position to the viewpoints 111b and 111c in the x-axis direction for measurement. The viewpoint 111 a is a standby place, the viewpoint 111 b is a measurement viewpoint of the lamp 112, and the viewpoint 111 c is a measurement viewpoint of the lamp 113. FIG. 1 shows a state where the vehicle is directly facing the condensing Fresnel lens 102 on the front surface of the headlight tester without tilting. Moreover, the height of the headlamp shows a state where it matches the height of the optical axis of the headlight tester.
FIG. 2 shows the structure of the headlight tester 201. The front surface of the main body 203 includes a Fresnel lens 202, a control device 205, and a monitor display 204. Images captured by a video camera built in the main body 204 are displayed on the monitor display 204. In the example of FIG. 2, the outer shape 206 of the headlamp is displayed. The coordinate axis of the main body 203 has a structure that can be slightly rotated (210) around the z-axis by the x-axis 207, the y-axis 208, and the z-axis 209.

  FIG. 3 is an explanatory diagram of the vanishing point concept of the lamp image to be measured that is the basis of the present invention. An example of a state in which the vehicle under test 301 is directly facing the headlight tester without tilt and does not require angle correction of tilt around the z-axis is shown. The headlight tester can freely move on the gantry in the x-axis, y-axis, and z-axis, and images the lamp 302 with the video camera in the headlight tester at the headlight tester viewpoints 304, 305, 306, 307, 308, and 309. In addition, in the z-axis direction in the lamp height direction, the directly-facing viewpoint 319, the viewpoint 320 lower than the directly-facing viewpoint 319, and the viewpoint 321 higher than the directly-facing viewpoint were also imaged, and these images are shown in FIG. Pixel coordinates on the monitor are displayed with the v axis as the vertical axis and the w axis as the horizontal axis. The lamp image of the headlight tester at the viewpoint 304 at the height viewpoint 319 is 406, and the lamp image of the headlight tester at the viewpoint 307 is 407. Here, the image when the headlight tester is arranged at a distance of infinity converges to the image disappearance point 403 which is the imaging center of the video camera. Similarly, the images captured by the headlight tester at the viewpoints 305 and 308 are 404 and 405, respectively, and the image when the headlight tester is arranged at a distance of infinity converges to the image vanishing point 403. The same applies to the images picked up by the headlight tester at the viewpoints 306 and 309, and the vanishing line coincides with the w axis (401). For the video at the viewpoint 321 where the height viewpoint is higher than the directly-facing height viewpoint 319, the lamp images by the headlight testers at the viewpoints 304 and 307 are 408 and 409, respectively, and the vanishing lines are indicated by 410. Similarly, vanishing lines at the height viewpoint 320 are 412 and 413.

  FIG. 5 shows the lamp image coordinate relationship with the vanishing point which is the center of the image. The example of FIG. 5 shows the coordinate relationship of the lamp images of the height viewpoint 319 and the headlight tester imaging viewpoints 306 and 309 of FIG. The lamp image of the headlight tester viewpoint 306 is displayed as 501, the lamp image of the viewpoint 309 is displayed as 502, and the coordinate relationship between the vanishing point and the lamp images 501 and 502 is expressed by a relational expression 503.

  As described above, by applying the coordinate relationship between the vanishing point and the lamp image of the headlight tester, the measurement distance and the heading angle of the headlight tester can be determined from the relationship with the actual movement amount of the headlight tester.

  The invention described in claim 1 is an application of the concept of vanishing point, and an example thereof is shown in FIG. FIG. 6 shows an example in which the vehicle 601 has an inclination angle with the headlight testers 605 and 606. The condenser lens of the headlight tester 605 has an initial setting parallel to the x axis. The headlight tester is moved from the standby position and moved to the headlight tester position 605 at the viewpoint A. At this time, the distance between the lamp 602 to be measured and the condenser lens of the headlight tester may be a position near a predetermined measurement distance of 1 m. The captured image coordinates of the headlight tester at the viewpoint A are displayed as a display 701 in FIG. 7, and the coordinate information of the lamp image 704 at this time is acquired. In the monitor display, the horizontal coordinate axis is the w axis and the vertical coordinate axis is the v axis. The headlight tester is moved to the viewpoint B (607) at the movement distances 606 and 705 (Δx) in the x-axis direction. The lamp image of the headlight tester at viewpoint B moves to display 702 (706), and a lamp image 707 is obtained. At this time, the vehicle 601 has an angle of inclination with the condenser lens on the front surface of the headlight tester, the lamp width coordinate size on the monitor of the lamp image 707 is (w4-w3), and the coordinate size of the lamp image 704 is (w1- In the example of FIG. 7, the coordinate size is different from w2), which is an example of (w4-w3)> (w1-w2). The coordinate size of the video 704 is virtually displayed on the monitor of the video 702 by the method described in FIG. In the display 702, (w6-w5) = (w1-w2) is obtained. The coordinate values of (w4-w3) and (w1-w2) indicate the y-axis movement direction of the headlight tester 607. (W4-w3)> (w1-w2) indicates that the headlight tester is moved in a direction away from the lamp. The headlight tester 607 at the viewpoint B is moved along the optical axis 608 to shift the lamp image to the display 703 (709). The lamp image 710 overlaps the virtual image 708 by moving the headlight tester. The amount of movement in the y-axis direction at this time is represented by 609 (Δy). Δx and Δy are the inclination angles themselves of the vehicle 601 with the headlight testers 605 and 606, and the headlight tester at the viewpoint C is rotated around the z axis to give the headlight tester an angle that is directly opposite to the vehicle. This method makes it possible to make the headlight tester face the measured lamp directly to the vehicle.

  The means (1) of claim 1 is an operation of moving the headlight tester 605 from the standby position of the headlight tester to the viewpoint A in FIG. The position of the headlight tester at the viewpoint A is not limited as long as the measured lamp can capture an image in the vicinity of a predetermined measurement distance. The lamp image at this time is a display 701. The means (2) for obtaining coordinate information of the coordinates of the lamp image 704 and the headlight tester (605) at the viewpoint A are moved by Δx in the x-axis direction (means 3). A headlight tester is arranged at the viewpoint B which is the position. The image center of the vanishing point of the video camera according to FIG. 5 having means (4) for displaying the headlight tester image of the viewpoint B as the second position on the display 702 as the lamp image 707 and simultaneously obtaining the coordinate information of 707. Means (5) for virtually displaying the coordinate size of the image 704 according to the coordinate relationship is performed. The means (6) moves by determining the y-axis movement direction from the coordinate relationship between the images 704 and 707. Here, since the condenser lens of the headlight tester 605 is initially set in parallel to the x-axis, the y-axis direction and the optical axis of the headlight tester match. When the y-axis movement amount at this time is Δy (609), the correction angle θ of the vehicle is θ = It is determined by atan (Δy / Δx).

  The invention described in claim 2 is an application of the concept of vanishing point, and an example thereof is shown in FIG. FIG. 8 shows an example in which the vehicle 801 has an inclination angle θ with the headlight testers 805, 806, 808, 811 and the vehicle facing is completed. The inclination angle θ is a known angle obtained by the means described in claim 1 and also obtained by actual measurement. The headlight tester is moved from the standby position and moved to the headlight tester position 805 at the viewpoint α, then moved to the viewpoint β and the viewpoint γ, and moved to the viewpoint δ which is the lamp facing point, and the irradiation light distribution of the lamp is measured. System. The lamp facing position is obtained from the distance and direction of movement and the coordinate relationship between the displayed lamp images. A summary of the lamp images by the viewpoint movement and the vanishing point coordinate relationship of the lamp images are shown as a display 1000. In the display 1000, the ramp image 1007 is an image of the viewpoint α, the ramp image 1008 is an image of the viewpoint β, and the viewpoint 1009 is an image virtually displayed as a coordinate coefficient based on the coordinate size based on the image center coordinate relationship of the vanishing point of the image 1008. This state is displayed as a display 1002. The lamp image 1010 moves along the optical axis of the headlight tester, and an example in which the lamp image matches the image 1009 as a display 1003 is shown. A lamp image 1011 indicated by a display 1004 is an image at the lamp facing position. The headlight tester on the display 1003 is moved along a line orthogonal to the headlight tester optical axis on the xy plane, so that the lamp facing point is obtained.

It is explanatory drawing of the example of this invention of Claim 2 of FIG. An image related to the movement of the viewpoint of the headlight tester is shown in FIG. FIG. 10 shows the vanishing point coordinate relationship. The headlight tester is moved from the standby position and moved to the headlight tester position 805 at the viewpoint α, and coordinate information of the lamp image 1007 at the viewpoint α is obtained. At this time, the distance between the lamp under measurement 802 and the condenser lens of the headlight tester may be a position near a predetermined measurement distance of 1 m. The headlight tester is moved by a distance Δx1 in the x-axis direction and Δy1 in the y-axis direction. The movement distance of Δy1 is
Δy1 = Δx1 · tanθ
Have a relationship. θ is a known angle obtained by the method of claim 1 or the like. A lamp image 1008 at the viewpoint β is shown as a display 1002. Since this ramp image 1008 is directly facing the vehicle, the coordinate size is the same as that of the image 1007. Reference numeral 1009 denotes an image obtained by virtually displaying the image 1008 as a coordinate coefficient based on the coordinate size based on the image center coordinate relationship of the vanishing point. The reference coordinate coefficient may differ depending on the headlight tester, but if the same model is used, the reference coordinate coefficient is the same. The actual reference coordinate coefficient is 1.75 / mm in the horizontal direction when the measurement distance is a predetermined 1 m and the monitor is VGA. A lamp image 1009 is virtually displayed in the display 1002 based on the reference coordinate coefficient. At this time, the moving direction of the viewpoint γ is determined based on the coordinate sizes of the lamp image 1008 and the virtual lamp image 1009. In the example of FIG. 8, since the image 1008 has a larger coordinate value than the image 1009, the headlight tester moves in a direction away from the lamp 802 to be measured. The axis of movement moves along the headlight tester optical axis 807 at the viewpoint β. The lamp image overlaps the image 1009 as the headlight tester moves to the viewpoint γ. This position is the predetermined measuring distance 1 m of the lamp. This lamp image 1010 is displayed as 1003. In the display 1003, the coordinate distance between the center of the video 1010 and the video center that is the vanishing point is (d + e / 2), and since this video is a reference coordinate coefficient video, the distance 810 is the movement distance = (d + e / 2). ) / Reference coordinate coefficient = (d + e / 2) /1.75
It becomes. If this movement distance is moved along an axis (812) perpendicular to the optical axis of the headlight tester on the xy plane, as shown by a display 1004, a viewpoint δ which is a lamp facing position is obtained.

  The means described in claim 2 will be described using a specific example. The means (7) according to claim 2 moves the headlight tester from the standby position to the position of the viewpoint α which is the first position in FIG. An image of the measured lamp 802 from the viewpoint α is shown in a display 1001 in FIG. The lamp image 1007 is displayed on the monitor and its coordinate information is acquired (8). The movement (9) from the first position to the viewpoint β, which is the second position, becomes a known vehicle diagonal angle correction angle θ. Move according to the amount of movement indicated. It moves on a movement line 814 where the movement amount in the x-axis direction is Δx1 and the movement amount in the y-axis direction is Δy. A lamp image 1008 at the viewpoint β at the second position is shown at 1002 in FIG. The lamp image 1008 is shown as an image 1009 with a reference coordinate coefficient (10) based on the coordinate relationship that is the image vanishing point (11). Furthermore, the lamp image 1010 when moving along the axis 807 in the viewpoint γ direction which is the third position moves until it overlaps the virtual image 1009 (12). The point where the virtual lamp image 1009 and the lamp image 1010 overlap is the third position of the viewpoint γ. The position of the third viewpoint γ is a predetermined measurement distance 1 m between the measured lamp 802 and the condensing lens surface of the headlight tester of the viewpoint γ. Thereafter, the headlight tester is moved (13) along the axis 809 on the xy side surface and orthogonal to the optical axis of the headlight tester at the viewpoint γ to obtain the lamp facing position (14).

  FIG. 9 is an enlarged view of the viewpoint moving operation of FIG. Movement from the viewpoint α to β moves along the vehicle front angle correction axis, and movement from the viewpoint β to the viewpoint γ moves along the optical axis of the headlight tester and the tester at the viewpoint β. The movement from the viewpoint γ to the viewpoint δ moves along the axis 909 orthogonal to the optical axis 907 in the xy plane.

  This system provides functions related to the measurement of irradiation light distribution characteristics of vehicle headlamp lamps. However, in order to realize smooth functions, the system must be fully automated in order to maximize the performance of the equipment. Is required. The present invention can automatically and continuously perform vehicle facing and lamp facing and is an important means for realizing measurement of various devices.

  The present invention is effective as other embodiments within the scope of the invention, such as any combination and application of the constituent elements of the present invention. For example, VGA class imaging devices and displays are currently used, but the use of higher definition devices contributes to accurate measurement, and the analysis on the image by changing the viewpoint of the present invention is not limited to the scope of vehicle inspection. Absent.

With such a configuration, it provides a measurement support function related to the vehicle headlamp lamp,
・ No other equipment is added.
・ Everything from vehicle front to lamp front can be done automatically.
・ Provide a system that does not bear new costs.
Can be expected

  Thus, the headlight tester system of the present invention has an advantage that vehicle inspection and measurement can be performed efficiently and accurately. .

  This is a measurement system related to the proposal of the present invention.   It is a headlight tester block diagram in connection with this invention.   It is explanatory drawing of the measuring method in connection with this invention.   It is explanatory drawing of the display and coordinate in connection with this invention.   It is explanatory drawing of the display and coordinate in connection with this invention.   It is explanatory drawing of embodiment by this invention.   It is explanatory drawing of the display and coordinate of embodiment by this invention.   3 is an example embodiment according to the present invention.   It is an expansion explanatory view of the example of an embodiment by the present invention.   It is a display coordinate display and control example of an embodiment according to the present invention.

  FIG. 6 shows an embodiment of the present invention. The condenser lens in front of the headlight tester is parallel to the x axis by default. At the viewpoint A, the distance between the lamp 802 to be measured and the condenser lens need not be a predetermined distance of 1 m. The movement from the viewpoint A to the viewpoint B moves in parallel to the x-axis, the distance is Δx, and the image of the viewpoint B is the viewpoint A if the vehicle is in a directly facing state with no inclination with respect to the headlight tester. The coordinate values of the lamp image at and the viewpoint B are the same. When the vehicle is not facing the vehicle and there is an inclination, the size of the lamp image at the viewpoint A and the viewpoint B is different. If the lamp image at the viewpoint B is larger than the lamp image at the viewpoint A, the viewpoint B is closer to the measured lamp 802 than the viewpoint A, and if the opposite is true, the vehicle has a tilt away from it. This indicates a direction in which the distance to the lamp 802 at the viewpoint A is equal to the distance at the viewpoint B. Here, if the headlight tester is moved along the optical axis (y-axis direction) so that the sizes of the lamp images at the viewpoint B are equal, the distances of the lamps 802 to be measured are the same. The inclination of the vehicle can be known from the amount of movement in the x-axis direction and the amount of movement in the y-axis direction, and the headlight tester can be rotated like 611 to face the vehicle.

  FIG. 8 is an application of the ability to know the distance of the lamp to be measured from the coordinate relationship with the vanishing point described above and the actual moving distance. If the model of the headlight tester is the same, the movement distance and the coordinate movement of the headlight tester are the same. This means that if the reference coordinate coefficient at a predetermined measurement distance of 1 m is known, the distance between the lamp to be measured and the headlight tester can be grasped.

  The second aspect of the present invention enables the lamp to be directly opposed from this principle. FIG. 10 shows an actual lamp facing method as a monitor display screen.

100 Lamp Measurement System 101 Headlight Tester 102 Headlight Tester Condensing Fresnel Lens 103a Base 103b Base 104 x-axis 105 y-axis 106 z-axis 107 x-axis Movement Direction 108 y-axis Movement Direction 109 z-axis Movement Direction 110 Roller 111a Headlight Tester Viewpoint 111b Headlight tester viewpoint 111c Headlight tester viewpoint 112 Lamp 113 Lamp 114 Vehicle 115 Lamp 116 Roller 117 Rail 118 Measuring distance 200 Headlight tester system 201 Headlight tester 202 Headlight tester Condensing Fresnel lens 203 Headlight tester main body 204 Monitor 205 Control Unit 206 Lamp Image 207 x-axis 208 y-axis 209 z-axis 210 z-axis rotation direction 300 measurement system 301 vehicle 30 Lamp 303 Lamp 304 Headlight tester viewpoint 305 Headlight tester viewpoint 306 Headlight tester viewpoint 307 Headlight tester viewpoint 308 Headlight tester viewpoint 309 Headlight tester viewpoint 310 Measurement distance 311 Fresnel lens surface position 312 y-axis 313 Movement direction 314 Movement direction 315 Rail 316 Rail 317 z-axis 318 Movement direction 319 Viewpoint 320 Viewpoint 321 Viewpoint 400 Vanishing point display 401 w-axis 402 v-axis 403 Disappearance point 404 Lamp image 405 Lamp image 406 Lamp image 407 Lamp image 408 Lamp image 409 Lamp image 410 Vanishing line 411 Vanishing line 412 Vanishing line 413 Vanishing line 500 Vanishing point coordinates 501 Lamp image 502 Lamp image 503 Formula 600 Example 601 Vehicle 02 Lamp 603 Lamp 604 Inclination angle 605 Viewpoint A headlight tester 606 Movement amount 607 Viewpoint B headlight tester 608 Optical axis 609 Movement amount 610 Viewpoint C headlight tester 611 Viewpoint C headlight tester 701 Image display 702 Image display 703 Video display 704 Lamp image 705 Movement amount 706 Transition arrow 707 Lamp image 708 Lamp image 709 Transition arrow 710 Lamp image 800 Example 801 Vehicle 802 Lamp 803 Lamp 804 Inclination angle 805 Viewpoint α headlight tester 806 Viewpoint β headlight tester 807 Optical axis 808 Headlight tester 809 for viewpoint γ Movement axis 810 Movement direction 811 Headlight tester 812 for viewpoint δ Movement axis 813 Predetermined measurement distance 814 Movement axis 900 Example 901 View Headlight tester 902 at point α Inclination angle 903 Movement amount 904 Movement amount 905 Movement axis 906 Headlight tester 907 at viewpoint β Optical axis 908 Headlight tester 909 at viewpoint γ Movement axis 910 Optical axis 911 Headlight tester 1001 at viewpoint δ Video Display 1002 Video display 1003 Video display 1004 Video display 1005 w-axis 1006 v-axis 1007 Lamp video 1008 Lamp video 1009 Lamp video 1010 Lamp video 1011 Lamp video 1012 Movement amount 1013 Transition arrow 1014 Movement amount 1015 Transition arrow 1016 Movement amount 1017 Transition arrow

Claims (2)

  A headlight tester for inspecting irradiation light distribution characteristics of a lamp that is a headlight of a vehicle is a y-axis in a direction away from the lamp of a vehicle to be inspected, an x-axis indicating an axis that moves in the left and right headlight directions of the vehicle -Z axis on the vertical movement direction axis orthogonal to the y plane, and a structure that allows slight rotation around the z axis, and a function to freely move each of the three orthogonal axes and a function to output the movement distance value A video camera for holding and imaging the lamp shape is provided in the headlight tester. In the headlight tester for comparing the lamp-shaped coordinates and the movement distance of the headlight tester from the lamp image displayed on the monitor by the video camera and causing the headlight tester to face the vehicle to be inspected, The headlight tester is moved to the first position (1) where the distance between the condenser lens on the front of the light tester and the lamp is near the predetermined measurement distance, and the lamp-shaped image is displayed on the monitor. Then, the headlight tester is moved to the second position in the x-axis direction (movement amount Δx) (3) to display a lamp-shaped image on the monitor, and the x-axis direction movement amount A means (4) for obtaining the relationship of the lamp image coordinates on the monitor is provided, and the label at the second position is determined based on the image center coordinate relationship that is the image vanishing point of the video camera. A virtual display (5) function with the first coordinate as the first coordinate, and the y-axis movement direction is determined from the virtual coordinate and the coordinates on the monitor of the lamp image at the second position, and the y-axis movement direction Accordingly, the lamp image is moved in the y-axis direction (6) to a third position overlapping the lamp image virtually displayed at the second position. Obtain the tilt angle between the vehicle and the headlight tester from the y-axis direction movement amount Δy to the third position and the movement amount Δx, and slightly rotate it around the z-axis to bring the vehicle to be inspected and the headlight tester facing each other. And a control method thereof.   A headlight tester for inspecting irradiation light distribution characteristics of a lamp that is a headlight of a vehicle is a y-axis in a direction away from the lamp of a vehicle to be inspected, an x-axis indicating an axis that moves in the left and right headlight directions of the vehicle -Z axis on the vertical movement direction axis orthogonal to the y plane, and a structure that allows slight rotation around the z axis, and a function to freely move each of the three orthogonal axes and a function to output the movement distance value A video camera for holding and imaging the lamp shape is provided in the headlight tester. In the headlight tester for comparing the lamp-shaped coordinates and the movement distance of the headlight tester from the lamp image displayed on the monitor by the video camera and causing the headlight tester to face the lamp to be inspected, The first position (7) in which the distance between the condensing lens and the lamp on the front surface of the headlight tester slightly rotated around the z-axis in accordance with the vehicle heading correction angle obtained by the item 1 or actual measurement is near a predetermined measurement distance. ) To move the headlight tester to display the lamp-shaped image on the monitor and obtain the coordinates on the monitor (8), and then keep the headlight tester in the relationship of Δy1 = Δx1 · tanθ, Move to the second position by moving the movement distance Δx1 in the direction and the movement distance Δy1 in the y-axis direction (9), and display the lamp-shaped image on the monitor A video image of the second position is displayed, and a lamp image as a reference coordinate coefficient (10) is virtually displayed on the monitor (11) based on the video center coordinate relationship that is the video vanishing point of the video camera at the second position. . Further, the headlight tester is moved along the optical axis according to the vehicle facing correction angle until the lamp image overlaps the virtual display (11) which is the reference coordinate coefficient lamp image (12). This position is the third position. After that, it moves along the axis perpendicular to the headlight optical axis that is on the xy plane and forms the vehicle front-facing correction angle with the x-axis (13), and the measured lamp is centered on the video camera image as the fourth position. An apparatus and method for aligning a lamp at a predetermined measurement distance by aligning the image center (14) and the method thereof.

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