CN107063085A - A kind of automobile lamp mask dimension measuring device based on light scanning lens - Google Patents

Abstract

The invention provides a non-contact vehicle light mask measuring device based on an optical scanning mirror, which is characterized in that it includes six fixed pillars 1, the six fixed pillars are evenly distributed in a regular hexagon, and the center of the regular hexagon coincides with the center of the measuring platform. A vertically movable adjustable beam 2 is installed on each pillar. A laser 3, a miniature scanning mirror 4 and two CCD cameras 5 are installed on each beam 2. The centerline of the optical scanning mirror 4 falls on the vehicle under test. In the middle position of the lamp mask, the digital micro-scanning mirrors on each beam and the laser are symmetrically placed on the left and right relative to the center of the pillar. Compared with the contact measuring device, the present invention has the characteristics of simple operation and high precision, and can meet the size detection requirements of various types of automobile lamp masks.

Description

A Dimension Measuring Device for Automobile Lamp Mask Based on Optical Scanning Mirror

technical field

The invention relates to a non-contact three-dimensional size measuring device for a car light mask, in particular to a non-contact car light mask size detection device based on an optical scanning mirror. The invention belongs to the field of measurement technology.

Background technique

Car lights are tools for vehicle lighting and play an important role in the safe driving of vehicles. The size detection of the headlight mask is a main content of the quality control of the headlights. With the acceleration of automobile renewal, the development of a new method for the size detection of the headlight mask to replace the contact measurement has become a research hotspot in the field of inspection. The use of optical three-dimensional scanning measurement devices can achieve fast and accurate detection, which has become the development trend of the appearance detection of auto parts.

At present, the size inspection of the headlight mask adopts a three-coordinate measuring instrument to detect the surface quality of the headlight mask to check the assembly accuracy of the headlight. Measuring personnel need to select local points on the edge of the lamp mask and limited points on the mask for measurement, and the overall surface size of the lamp mask cannot be inspected. When performing contact measurement, the datum busbar must be leveled first. For the geometric elements that cannot be directly measured in the field of view: such as the center, midpoint, intersection, centerline and their mutual distance, shape and positional relationship, etc., a series of measurements are required. Complicated calculations are required. In order to improve the measurement accuracy, the car light manufacturer uses a inspection tool that matches the shape of the car light to measure the size of the car light. Each inspection tool can only test the corresponding type of car light. The development cycle of the inspection tool is long and the cost is high. Compared with contact measurement technology and the use of inspection tools, the non-contact 3D scanning system uses an optical scanning mirror to complete the surface measurement of the lamp mask, and the coordinate value of the size of the mask to be measured is obtained through computer calculation, which has the advantages of short scanning time and high accuracy. advanced features.

The non-contact three-dimensional car light mask measuring device proposed by the invention is based on laser measurement technology, has the characteristics of non-contact and self-adaptation, and can perform high-resolution detection on the car light mask. The sweeping movement of the scanning mirror is realized through the transmission system, and the position of the reflecting surface of the scanning mirror is constantly changing, changing the reflection direction of the incident light, and realizing the scanning of the headlight mask. With the maturity of photoelectric devices and laser technology, it is possible to develop a non-contact lamp mask size measurement system.

The measuring device proposed by the invention uses an automatic scanning and identification method to realize automatic scanning and detection of the car lamp mask. Scan the vehicle lights to be measured from multiple angles of view to complete the fusion of scanned data. The entire scanning process is fully automated without user intervention, providing users with a detection method that is easy to use and easy to operate. Scan the light mask to record data from left to right, so that the outline of the light mask can be displayed in the form of curved surface, point cloud, grid, etc.

The system is equipped with a computer-aided measurement operating system, which can accurately calculate the three-dimensional coordinates of the headlight mask, save the test results and generate test reports. During the measurement process, the coordinates of the scanning points are displayed on the computer in real time, and the conversion between rectangular coordinates and polar coordinates can be completed at any time. The actual measurement mask data is compared with the theoretical data of the lamp mask to obtain the detection results. All measurement results, calculation results and headlight mask outline graphics are saved in the computer as files, which can be recalled, edited and printed at any time. The three-dimensional coordinate measurement operating system using computer-aided measurement can complete image processing and coordinate calculation in real time, and is suitable for non-contact measurement of various car lamp mask sizes.

Contents of the invention

The object of the present invention is to provide a detection device with high detection accuracy and low cost, which is suitable for various types of headlight mask size detection devices, so as to solve the problems of limited measurement points, strict environmental requirements and measurement errors in the contact measurement method.

In order to solve the above problems, the technical solution of the present invention provides a non-contact vehicle light mask size detection device based on an optical scanning mirror, which is characterized in that it includes six fixed pillars evenly distributed in a regular hexagon, and the center of the regular hexagon is aligned with the The center of the measuring table coincides, and vertically movable beams are installed on each pillar, and a laser, a micro-scanning mirror and two CCD cameras are installed on each beam, and the center line of the micro-scanning mirror falls on the center of the measuring table The position, the digital micro-scanning mirror and the laser on each beam are symmetrically placed left and right relative to the center of the pillar, and the two CCD cameras on the beam are placed on the outside of the micro-scanning mirror and the laser at a specific angle.

Compared with the contact measurement technology, the present invention has the following significant advantages: the measurement array based on the optical micro-scanning mirror is adopted, and the swinging action of the micro-scanning mirror is realized through the stepping motor system, and then the laser emission direction is changed to realize the scanning of the mask area . It has the characteristics of small size, high precision, and can realize the continuous measurement of the whole headlight mask. The inspector places the lamp mask to be tested in the designated area of the instrument, and only requires that the lamp mask and the turntable remain relatively fixed during the scanning process. The invention has the advantages of simple operation and high precision, and can meet the measurement requirements of various automobile lamp masks.

Description of drawings

FIG. 1 is a top view of the structure of a non-contact headlight mask scanner based on a digital micro-scanning mirror provided by the present invention.

Fig. 2 is a schematic diagram of the coverage of the field of view of the car light mask by the CCD camera adopted in the present invention.

Fig. 3 is a diagram showing coverage of the visual field of the car lamp mask by the laser scanning line reflected by the digital micro-scanning mirror adopted in the present invention.

FIG. 4 is a schematic diagram of a micro-scanning mirror driven by a stepping motor used in the present invention.

FIG. 5 is an electrical connection diagram of the non-contact headlight mask scanner based on the digital micro-scanning mirror provided by the present invention. Fig. 6 is a schematic structural diagram of a device for measuring the size of an automobile lamp mask provided by the present invention.

detailed description

In order to make the implementation of the present invention more obvious and understandable, the detailed description is as follows in conjunction with the accompanying drawings:

As shown in Figures 1 to 3, a non-contact vehicle light mask size detection device based on an optical scanning mirror provided by the present invention mainly includes six fixed pillars 1, a beam 2, six line laser generators 3, six Optical scanning mirror 4, 12 CCD cameras 5, and a measuring table 6.

The six fixed pillars are evenly distributed in a regular hexagon, and the center of the regular hexagon coincides with the center of the measuring platform. A movable beam 2 is installed on each pillar, and a laser 3, a miniature scanning mirror 4 and two scanning mirrors 4 are installed on the beam 2. The center line of the CCD camera 5 and the optical scanning mirror 4 falls on the middle position of the car lamp mask under test, the optical scanning mirror on each crossbeam and the laser are placed symmetrically on the left and right relative to the center of the pillar, and the left and right sides of the CCD camera 5 are respectively placed at a specific angle. The outside of the miniature scanning mirror and laser.

In the present invention, the laser sweeping action is realized by the optical scanning mirror 4. The deflection angle range of the optical scanning mirror 4 is ±25°, and the deflection angle range of the reflected laser beam is ±50°. Assuming that the length of the car light mask under test is L, since the maximum opening angle of the laser beam reflected by the optical scanning mirror 4 is 50°, in order to ensure that the optical scanning mirror 4 can completely scan the car light mask from top to bottom, the measured car light The distance X>L/2tan25° between the mask and the pillar.

In the present invention, the initial deflection angle of the optical scanning mirror 4 is the same, all of which are 30° to the horizontal direction, and the line laser generator 3 from six different directions generates six beams of line laser light, which are reflected by the scanning mirror to the surface of the car lamp mask under test to form laser light For the halo, the CCD cameras 5 respectively located on the six pillars acquire images of the laser halo from different angles. By changing the mirror sweep angle 14 of the optical scanning mirror 4 , the reflection angle 15 of the incident laser light is sequentially changed. When the swing angle of the optical scanning mirror 4 reaches the specified value, the line laser generator 3 is triggered once to realize laser scanning at one position. During a complete laser scanning process of the headlight mask, the exposure time of all CCD cameras 5 is greater than the scanning time. The CCD camera 5 is fixed during the scanning process. The coverage 13 of the visual field of the CCD camera 5 in the measuring device to the lamp mask is shown in FIG. 2 , and the coverage 15 of the visual field of the laser scanning line to the lamp mask is shown in FIG. 3 . Using the image processing program to extract the center curve of the laser halo, combined with the calibration template of the CCD camera 5, according to the triangulation method, reconstruct the surface geometric information of the lamp mask, and calculate the three-dimensional coordinates of the measurement point.

The structure of the optical scanning 4 adopted in the present invention is shown in FIG. 4 . It is mainly composed of a transmission shaft 7 , a swing member 8 , a mirror 9 , a stepping motor 10 and a base 11 . The stepper motor 10 transmits the motion to the swing member 8 through the transmission shaft 7, the reflector 9 is fixed on the swing member 8, and the reflector 9 rotates as the swing member 8 rotates. The rotation of the stepper motor 10 is controlled by the pulse to realize the rotation angle of the transmission shaft 7, that is, to change the swing angle of the swing member 8, thereby controlling the deflection angle of the swing member 8, that is, the deflection angle of the mirror 9.

In conjunction with Fig. 5, the vehicle light mask measuring device provided by the present invention starts the control unit 13 by the computer 12 and guides it to complete various control tasks. The control unit 13 controls the rotation angle of the stepper motor 10, and realizes the optical scanning mirror 4 through the transmission link. Trigger the line laser generator 3 when the swing sweeps to a specified angle, so as to realize laser scanning at one position. The light signal of the laser scanning line is transmitted to the image acquisition card via the CCD camera 5 , and the image acquisition card returns the formed image to the computer 12 .

The present invention adopts the optical triangulation method, utilizes the edge detection technology to extract the laser center line, combines the calibration template of the CCD camera 5 to reconstruct the surface profile of the lamp mask, and obtains the coordinates of the measuring point of the lamp mask through calculation. Through the laser measurement of the lamp mask, the coordinate data of the surface of the lamp mask is quickly generated, which overcomes the shortcomings of the contact measurement method, such as limited data collection points and cumbersome calibration process. The measuring device provided by the invention is easy to operate, the measurement time is short, With high precision, it can meet the size detection requirements of various types of headlight masks.

Claims (3)

1. A non-contact car lamp mask size detection device based on an optical scanning mirror, characterized in that: it includes six fixed pillars (1), the six fixed pillars are evenly distributed in a regular hexagon, and the center of the regular hexagon coincides with the center of the measuring platform , vertically movable adjustable beams (2) are installed on each pillar, and a laser (3), a miniature scanning mirror (4) and two CCD cameras (5) are installed on each beam (2). The center line of the scanning mirror (4) falls in the middle of the lamp mask under test. The digital micro-scanning mirror on each beam and the laser are placed symmetrically on the left and right relative to the center of the pillar. The left and right sides of the CCD camera (5) are respectively placed The outside of the miniature scanning mirror and laser. 2. A non-contact vehicle light mask measuring device based on an optical scanning mirror as claimed in claim 1, characterized in that: the stepping motor drives the optical scanning mirror (4) to generate a sweep, and the sweep reaches a specified angle to trigger once Line laser generator (3), six line laser generators (3) in different directions generate six beams of line lasers, the laser beams are reflected by the optical scanning mirror (4) to the surface of the car light mask to form a laser halo, realizing the inspection of the car light mask full scan. 3. a kind of non-contact car lamp mask measuring device based on optical scanning mirror as claimed in claim 2, is characterized in that: collect the laser halo of measured car lamp mask surface by CCD camera (5), optical scanning mirror ( 4) Every time the specified angle is reached, the line laser generator (3) is triggered to scan at one position. During a complete laser scanning process of the headlight mask, the exposure time of all CCD cameras (5) is longer than the scanning time, and the scanning CCD camera (5) is fixed in the process.