KR102038227B1 - Apparatus for measuring quality of lens for vehicle and system for using the same - Google Patents

Abstract

According to the present invention, provided are a lens performance measurement apparatus for a vehicle, capable of measuring the performance of a measurement target lens by installing only the lens before assembling the lens with a head lamp assembly, and a measurement system using the same. To achieve the purpose, the lens performance measurement apparatus includes: a light source part outputting light; a reflector reflecting the light outputted from the light source part to emit the light in a predetermined direction; a cutoff shield forming a predetermined beam pattern by cutting off some of the light going to a lens part, which is a measurement target, after being reflected by the reflector; and an actuator enabling the lens part to be fixed to or separated from a predetermined position, and operated to move the lens part to control a focal distance. Therefore, according to the present invention, since the performance of a measurement target lens is measured by installing only the lens before assembling the lens with a head lamp assembly, the whole head lamp assembly can be prevented from becoming defective due to a defective lens.

Description

Automotive lens performance measuring apparatus and measuring system using same {APPARATUS FOR MEASURING QUALITY OF LENS FOR VEHICLE AND SYSTEM FOR USING THE SAME}

The present invention relates to a lens performance measuring apparatus for a vehicle and a measuring system using the same. More specifically, a lens performance measuring apparatus for a vehicle and a measurement using the same, in which a lens is measured by installing only a measurement target lens before assembling the headlamp assembly. It's about the system.

In general, automobiles are equipped with a plurality of lamps, such as headlights, turn signals, reverse lights, taillights, and interior lights.

The light distribution performance of the various lamps is provided to have a certain standard, and therefore, a process for measuring whether the light distribution performance of the lamp is in compliance with the specification is performed before assembling the lamp to the vehicle.

1 is an exemplary view illustrating a performance measurement process of a head lamp, in which a light source 10 is installed at one side of the reflector 20, and the light output from the light source 10 and the light reflected from the reflector 20 are transmitted. The lens unit 30 and the shield unit 40 which blocks a portion of the light reflected by the reflector 20 and proceeds to the lens unit 30 to form a predetermined beam pattern are disposed at one side. The performance is measured by checking the projected image by irradiating light to the screen 50 installed at a certain distance (for example, 25 m) away from the lens unit 30.

2 is a perspective view illustrating a headlamp assembly having a general projection lens, wherein the headlamp assembly 60 includes a light source, a reflector 61, a projection lens portion 62, and a shield portion 63. do.

On the other hand, the patterned projection lens portion 62 is slightly different patterning occurs for each projection lens portion 62 in the manufacturing process, such a difference, as shown in the red circle shown in Figure 3 (a), various light distribution patterns This difference in light distribution patterns leads to product defects that do not satisfy the preset product specifications.

In addition, micro-optic (patterning) slightly occurs for each of the projection lens units 62 in the process of manufacturing the patterned projection lens unit 62, so that chromatic aberration of light distribution is reduced as shown in the red circle shown in FIG. 3B. There is a problem that does not meet the product specifications.

However, the process of checking whether the light distribution pattern and chromatic aberration meets the standard is to select the defective parts while performing the inspection process before the final shipment of the headlamp assembly, and the light source, the reflector, the shield part, and the projection lens part are all When the measurement is performed in the assembled assembly state, when the product specification is not satisfied, there is a problem of disposing the assembled headlamp assembly as a defective product.

Korean Laid-Open Patent Publication No. 10-1998-039023 (Name of invention: Jig for measuring light distribution performance of automobile)

In order to solve this problem, it is an object of the present invention to provide a vehicle lens performance measurement apparatus and a measurement system using the same to measure the performance of the lens by installing only the measurement target lens before assembling the headlamp assembly.

The present invention to achieve the above object is a light source for outputting light; A reflector reflecting the light output from the light source unit in a predetermined direction; A cut-off shield that forms a predetermined beam pattern by blocking a part of light reflected by the reflector and traveling to the lens unit to be measured; And an actuator configured to fix or separate the lens unit to be measured at a predetermined position and move the lens unit to adjust a focal length.

In addition, at least one of the reflector and the cut-off shield according to the present invention is characterized in that the installation is changed to a different shape according to the performance measurement standard.

In addition, the actuator according to the present invention is characterized in that it operates to vary according to the diameter of the lens unit to be measured.

In addition, the present invention is provided with a lens unit to be measured, the light source unit for outputting light, a reflector for reflecting the light output from the light source unit to be irradiated in a predetermined direction, and a portion of the light reflected by the reflector and proceeds to the lens unit A lens measuring module including a cut-off shield for blocking a portion to form a predetermined beam pattern, and an actuator configured to fix or separate the lens portion at a predetermined position, and to move the lens portion to adjust a focal length; A measurement controller configured to output a light source unit, a cutoff shield, and an operation control signal of an actuator of the lens measurement module; A collimator for converting the light output from the lens unit of the lens measuring module into parallel light and outputting the parallel light; A photographing unit which photographs the parallel light converted by the collimator and outputs it as an image signal; And a performance measuring unit configured to receive the image signal photographed by the photographing unit and analyze the performance signal by using a preset performance analysis program to evaluate performance information of the lens unit.

In addition, the measurement control unit according to the present invention includes a light source control unit for outputting an on / off operation control signal of the light source unit; A cutoff controller configured to output a position control signal of the cutoff shield; And a lens position controller for outputting an operation control signal of the actuator.

In addition, the collimator may include a reflector reflecting light emitted from the lens measuring module so as to form and form a predetermined path; And a parabolic mirror for converting the light reflected by the reflector into parallel light and outputting the parallel light.

In addition, the performance measuring unit according to the present invention calculates a Contrast Threshold Function (CTF) using the image signal received through the photographing unit, and a modulation value (Modulation) obtained by dividing the calculated CTF by the angular distance φ of the measuring point ( M) is calculated and the performance of the lens unit is evaluated by comparing the inclination value in the cutoff line with a preset light distribution rule.

The present invention has an advantage of preventing the entire headlamp assembly from being treated as defective due to a defective lens by measuring the performance of the lens by installing only the measurement target lens before assembling the headlamp assembly.

1 is an exemplary view showing a process of measuring the performance of the headlamp.
Figure 2 is a perspective view of a headlamp assembly having a typical projection lens.
Figure 3 is an exemplary view showing the change in light distribution pattern and the generation of chromatic aberration in the measurement process of a general projection lens.
Figure 4 is a block diagram showing the configuration of a vehicle lens performance measurement apparatus and a measurement system using the same according to the present invention.
Figure 5 is a block diagram showing a lens performance measurement module of a vehicle lens performance measurement apparatus and a measurement system using the same according to the present invention.
6 is an exemplary view showing the configuration of a lens performance measurement module for a vehicle lens performance measurement apparatus and a measurement system using the same according to the present invention.
7 is a block diagram showing a configuration of a measurement control unit for a vehicle lens performance measurement apparatus and a measurement system using the same according to the present invention.
8 is an exemplary view showing a collimator structure of a vehicle lens performance measurement apparatus and a measurement system using the same according to the present invention.
9 is an exemplary view illustrating a process of calculating a Contrast Threshold Function (CTF) from an image captured by a camera of a vehicle lens performance measuring apparatus and a measuring system using the same according to the present invention.

Hereinafter, exemplary embodiments of a vehicle lens performance measuring apparatus and a measuring system using the same according to the present invention will be described in detail with reference to the accompanying drawings.

In this specification, the expression "comprising" a certain component means that it may further include other components rather than exclude other components.

In addition, the terms "... part", "... group", "... module" and the like refer to a unit for processing at least one function or operation, which may be divided into hardware, software, or a combination of the two.

4 is a block diagram illustrating a configuration of a vehicle lens performance measuring apparatus and a measuring system using the same according to the present invention, and FIG. 5 is a block diagram illustrating a lens performance measuring module of the vehicle lens performance measuring apparatus and the measuring system using the same. 6 is an exemplary view showing a configuration of a lens performance measurement module for a vehicle lens performance measurement apparatus and a measurement system using the same, and FIG. 7 is a vehicle lens performance measurement apparatus and a measurement system using the same according to the present invention. 8 is a block diagram illustrating a configuration of a measurement controller, and FIG. 8 is an exemplary view illustrating a collimator structure of a vehicle lens performance measuring apparatus and a measuring system using the same according to the present invention.

4 to 8, the vehicle lens performance measuring apparatus and measuring system according to the present invention includes a lens measuring module 110, a measuring control unit 120, a collimator 130, a photographing unit 140, And a performance measurement unit 150.

The lens measuring module 110 is configured to perform performance measurement by replacing only the lens unit 200 that is a measurement target, and includes a light source unit 111, a reflector 111a, and a housing having an accommodation space therein. And a cutoff shield 112 and an actuator 113.

The light source unit 111 is configured to output light, but a semiconductor light emitting device, for example, a light emitting diode (LED) is used. However, the light source unit 111 is not limited thereto, and a light source such as a bulb may be used. The number of light sources 111 or the color of irradiated light may vary depending on the application.

In addition, the light source unit 111 may be used together with a light source unit having a different color when two or more different uses.

In addition, the light source unit 111 may be installed on one surface of the circuit board. When the light source unit 111 includes a plurality of light sources, a plurality of circuit boards may be used, or may be shared with each other.

The reflector 111a is configured to reflect the light output from the light source 111 so as to be irradiated in a predetermined direction. The reflector 111a may be formed in an elliptic curved shape or a hemispherical shape in which one surface is opened, and the light source unit is focused on the reflector 111a. 111 may be installed.

In addition, the reflector 111a may be provided with a reflector having a shape that is a reference of the headlamp assembly, and may be installed as a reflector having a different shape according to a standard or performance measurement standard of the headlamp assembly product.

The cut-off shield 112 is configured to block a portion of the light reflected by the reflector 111a to the lens unit 200 to be measured to form a predetermined beam pattern. Cutoff lines are formed to protect.

In addition, the cut-off shield 112 may be configured in a flat plate shape formed in the horizontal direction, the front end is configured to have a curved shape that is gradually displaced to both sides of the lens unit 200 along the rear focal plane of the lens unit 200. May be

In addition, the cut-off shield 112 may be configured to form a step-off on the upper surface to form a cutoff line of left and right asymmetry, and may be changed to a cut-off shield of a different shape according to the specification of the headlamp assembly or the performance measurement standard. Can be.

The actuator 113 may fix the lens unit 200 to a predetermined position of a housing using a holder (not shown) to measure the performance of the lens unit 200 as a measurement target or the lens unit 200 in which the measurement is completed. The holder so that the holder is separated from the housing.

In addition, the actuator 113 is operated to move the lens unit 200 in the direction of light irradiation to adjust the focal length of the lens unit 200, the actuator 113 is a motor, hydraulic, pneumatic, It can be configured using various devices such as solenoids.

In addition, the actuator 113 is configured such that the size of the holder for tightly fixing the lens unit 200 is variable according to the diameter of the lens unit 200 to be measured so that lenses of various sizes are fixed to the lens measuring module 110. Performance measurement is possible.

The measurement control unit 120 outputs an operation control signal of the light source unit 111, the cutoff shield 112, and the actuator 113 of the lens measurement module 110, and includes a light source control unit 121 and a cutoff. The control part 122 and the lens position control part 123 are comprised.

The light source controller 121 outputs an on / off operation control signal of the light source unit 111 and controls the light source unit 111 to be turned on / off by a preset light source operation program.

The cutoff control unit 122 outputs a position control signal so that the light reflected by the reflector 111a through the cutoff shield 112 maintains a predetermined position or moves to an arbitrary position so as to form an arbitrary cutoff line. The cutoff shield 112 is controlled to operate by a set operation program of the cutoff shield.

The lens position controller 123 outputs an operation control signal to the actuator 113. The lens position controller 123 outputs an operation control signal to the actuator 113 according to the size and type of the lens to be measured 200.

In addition, the lens position controller 123 may further configure a plurality of position detection sensors (not shown) so as to confirm whether the lens unit 200, which is a measurement target, is moved to the correct position, and the feedback output from the position detection sensor. By outputting an operation control signal of the actuator 113 using a signal, the lens unit 200 can be moved to the correct position.

The collimator 130 is configured to convert light output from the lens unit 200 of the lens measuring module 110 into parallel light and output the parallel light. One side is opened, and the light output from the lens measuring module 111 is A hollow is formed to move and includes a reflecting mirror 132 and a parabolic mirror 133.

The reflector 132 provides a path to reflect the light output from the lens measuring module 110 through the light source inlet 131 to the parabolic mirror 133.

The parabolic mirror 133 converts the light reflected by the reflector 132 into parallel light and reflects it to be output to the opening side.

The photographing unit 140 is installed at the opening side of the collimator 130, and outputs an image signal by capturing the parallel light converted by the collimator 130. Is done.

In addition, the photographing unit 140 is not limited to a camera composed of the CCD sensor and the CMOS sensor, and may be formed of a photographing apparatus using photoelectric conversion means for converting an optical signal into an electrical signal and outputting an image signal.

The performance measuring unit 150 outputs an operation control signal of the measurement control unit 120 and an operation control signal to the photographing unit 140, and is output from the lens driving module 110 under the control of the measurement control unit 120. Receives an image signal of the photographing unit 140 taking light and analyzes it through a preset performance analysis program to evaluate the performance information of the lens unit 200. A PC having input means, arithmetic means, and output means. Is made of.

In addition, the performance measurer 150 calculates a Contrast Threshold Function (CTF) using the image signal received through the photographing unit 140.

That is, as shown in FIG. 9, the CTF, which is a transfer function for the first and second shaded bands 310 and 320, which are periodic patterns having the same width, is calculated from the image signal forming the cutoff line 300. The gradient of the cutoff line 300 is calculated.

The CTF may be calculated from a value obtained by dividing the brightness of the first shadow band by the brightness of the second shadow band (first shadow band brightness / second shadow band brightness).

In addition, by calculating a modulation value (M) obtained by dividing the calculated CTF by the angular distance (φ) of the measuring point, and comparing the gradient value at the cutoff line 300 with a preset value in the light distribution regulation, The performance of the lens unit 200 is determined by checking whether the performance of the lens unit 200 is satisfied.

The setting value according to the set light distribution rule may be different for each country and region, and thus the performance of the lens unit 200 may be determined by changing the setting value according to the region where the headlamp assembly is used.

Therefore, by assembling only the lens to be measured in the lens measuring module and measuring the performance of the lens before assembling the headlamp assembly, it is possible to prevent the entire headlamp assembly from being treated as defective due to the lens defect.

As described above, it has been described with reference to a preferred embodiment of the present invention, but those skilled in the art various modifications and changes of the present invention without departing from the spirit and scope of the invention described in the claims below I can understand that you can.

In addition, the reference numerals described in the claims of the present invention are not limited to the above described for clarity and convenience of the description, it is not limited to this, the thickness of the lines shown in the drawings or the size of the components in the process of explaining the embodiment May be exaggerated for clarity and convenience of the description, and the terms described above are terms defined in consideration of functions in the present invention, and may vary according to the intention or custom of the user or operator, and thus interpretation of these terms Will be made based on the contents throughout the specification.

100: vehicle lens performance measurement system 110: lens measurement module
111: light source 111a: reflector
112: cut off shield 113: actuator
120: measurement control unit 121: light source control unit
122: cutoff control unit 123: lens position control unit
130: collimator 131: light source inlet
132: reflector 133: parabolic mirror
140: recording unit 150: performance measurement unit
200: lens unit 300: cutoff line
310: first shade zone 320: second shade zone

Claims (7)

A light source unit 111 for outputting light;
A reflector (111a) reflecting the light output from the light source unit 111 to be irradiated in a predetermined direction;
A cutoff shield 112 for blocking a portion of light reflected by the reflector 111a and traveling to the lens unit 200 to be measured to form a predetermined beam pattern; And
The lens unit 200 to be measured is fixed or separated at a predetermined position, and is changed according to the diameter of the lens unit 200 to be measured, and the focal length is adjusted by moving the lens unit 200. Actuator 113 to include; including,
At least one of the reflector 111a and the cutoff shield 112 may be installed in a different shape according to a performance measurement standard.
The cut-off shield 112 has a flat plate shape formed in a horizontal direction, a curved shape where a front end is displaced to both sides of the lens unit 200 along the rear focal plane of the lens unit 200, and a cutoff line having left / right asymmetrical cutoff lines is formed. Vehicle lens performance measurement apparatus, characterized in that made of any one of the shape having a step on the upper surface. delete delete The lens unit 200, which is a measurement target, is installed to the light source unit 111 for outputting light, the reflector 111a reflecting the light output from the light source unit 111 in a predetermined direction, and the reflector 111a. The cutoff shield 112 which forms a predetermined beam pattern by blocking a part of the light which is reflected by the lens unit 200 to be measured, and the lens unit 200 to be measured are fixed or separated at a predetermined position. And an actuator 113 that is variable according to the diameter of the lens unit 200 as the measurement target, and moves to adjust the focal length by moving the lens unit 200, including the reflector 111a and the cutoff. At least one of the shield 112 is installed in a different shape according to the performance measurement standard, the cut-off shield 112 is a flat plate formed in the horizontal direction, the front end of the lens along the rear focal plane of the lens unit 200 One lens measurement module (110) comprising one of a shape having a step on the upper surface so that the curve-shaped, cut-off line of the left / right asymmetry is displaced to both sides of 200 to form;
A measurement control unit 120 for outputting an operation control signal of the light source unit 111, the cutoff shield 112, and the actuator 113 of the lens measurement module 110;
A collimator 130 for converting the light output from the lens unit 200 of the lens measuring module 110 into parallel light and outputting the parallel light;
A photographing unit 140 which photographs the parallel light converted by the collimator 130 and outputs the image signal as an image signal; And
And a performance measuring unit (150) for receiving the image signal photographed by the photographing unit (140) and analyzing the performance information of the lens unit (200) by analyzing it with a predetermined performance analysis program. The method of claim 4, wherein
The measurement control unit 120 may include a light source control unit 121 outputting an on / off operation control signal of the light source unit 111;
A cutoff controller 122 for outputting a position control signal of the cutoff shield 112; And
And a lens position control unit (123) for outputting an operation control signal of the actuator (113). The method of claim 4, wherein
The collimator 130 includes a reflector 132 reflecting the light output from the lens measuring module 110 to form a predetermined path and irradiated;
And a parabolic mirror (133) for converting the light reflected by the reflector (132) into parallel light and outputting the same. The method of claim 4
The performance measuring unit 150 calculates a Contrast Threshold Function (CTF) using the image signal received through the photographing unit 140, and modulates the calculated CTF by dividing the calculated CTF by the angular distance φ of the measurement point. And calculating the value (M) to evaluate the performance of the lens unit by comparing the inclination value in the cutoff line with a preset light distribution rule.

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