KR20130029681A - Auto focusing apparatus - Google Patents

Auto focusing apparatus Download PDF

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Publication number
KR20130029681A
KR20130029681A KR1020110093101A KR20110093101A KR20130029681A KR 20130029681 A KR20130029681 A KR 20130029681A KR 1020110093101 A KR1020110093101 A KR 1020110093101A KR 20110093101 A KR20110093101 A KR 20110093101A KR 20130029681 A KR20130029681 A KR 20130029681A
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KR
South Korea
Prior art keywords
lens assembly
inspection
reflected light
unit
rotating
Prior art date
Application number
KR1020110093101A
Other languages
Korean (ko)
Inventor
강성용
구자철
이현민
강민구
이상윤
임쌍근
Original Assignee
(주) 인텍플러스
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Publication date
Application filed by (주) 인텍플러스 filed Critical (주) 인텍플러스
Priority to KR1020110093101A priority Critical patent/KR20130029681A/en
Publication of KR20130029681A publication Critical patent/KR20130029681A/en

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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/84—Systems specially adapted for particular applications
    • G01N21/88—Investigating the presence of flaws or contamination
    • G01N21/8851—Scan or image signal processing specially adapted therefor, e.g. for scan signal adjustment, for detecting different kinds of defects, for compensating for structures, markings, edges
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
    • G02B7/28—Systems for automatic generation of focusing signals
    • G02B7/36—Systems for automatic generation of focusing signals using image sharpness techniques, e.g. image processing techniques for generating autofocus signals
    • G02B7/38—Systems for automatic generation of focusing signals using image sharpness techniques, e.g. image processing techniques for generating autofocus signals measured at different points on the optical axis, e.g. focussing on two or more planes and comparing image data
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/84—Systems specially adapted for particular applications
    • G01N21/88—Investigating the presence of flaws or contamination
    • G01N21/8851—Scan or image signal processing specially adapted therefor, e.g. for scan signal adjustment, for detecting different kinds of defects, for compensating for structures, markings, edges
    • G01N2021/8887—Scan or image signal processing specially adapted therefor, e.g. for scan signal adjustment, for detecting different kinds of defects, for compensating for structures, markings, edges based on image processing techniques
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/1306—Details
    • G02F1/1309—Repairing; Testing

Abstract

PURPOSE: An auto-focusing device is provided to change a test range on a real time basis, thereby improving productivity. CONSTITUTION: An auto-focusing device(100) comprises a lens assembly(110), a transmissive rotary part(120), a photographing part(130), a reader(140), and a distance control part(150). The lens assembly comprises a lens which transmits a reflected light which is reflected from a device being tested. The transmissive rotary part is arranged on a transmission route of the reflected light passing through a lens assembly and rotates in one direction eccentrically to the lens assembly. The rotary part prepares an inclination zone which gradually increases in thickness following a rotational direction and converts an optical density on a real time basis. The photographing part is arranged on the transmission route of the reflected light passing through the rotary part and obtains an image. The reader receives an image photographed from the photographing part and determines the existence of focus. The distance control part controls a distance between a camera for testing and the device being tested, depending on the determination of the reader.

Description

[0001]

The present invention relates to an auto focusing apparatus, and more particularly, to an auto focusing apparatus for precisely adjusting a focus by grasping a trend for each coordinate of an inspection object in real time.

In general, the test object in the form of a cell or module including various panels is characterized by low voltage driving, low power consumption, full color, light weight and small size, and can be used in clocks, calculators, PC monitors, notebook computers, TVs, aviation monitors, Its use is diversified to personal portable terminals, cellular phones, and the like.

Particularly, in order to manufacture an LCD panel, first, a TFT (Thin Film Transistor) plate and a color filter plate are manufactured, and then a TFT plate and a color filter plate are bonded through an assembling process. Then, when the TFT plate and the color filter plate are bonded, they are separated into individual unit panels through scribing and breaking. Subsequently, when the TFT plate and the color filter plate are bonded to each other and cut into LCD cells, a liquid crystal is injected between the TFT plate and the color filter plate and then sealed to seal the LCD panel.

In general, LCD panels are subjected to various quality tests after their manufacture. Among them, important quality tests are to perform vision tests on the surface of LCD panels including indentations caused by pressing. In the case where an indentation due to excessive pressing or the like is generated on the LCD panel, there arises a problem that the image quality is deteriorated due to the light refraction of the light passing through the LCD cell. As a result, the degree of indentation greatly affects the acceptance / The defect inspection on the surface of the LCD panel such as indentation is an important part of the inspection item.

Recently, many auto focus functions have been provided in an imaging device such as a camera to automatically adjust the focus of a subject for the convenience of a user. The autofocus method is mainly used with a TTL (Trough The Lens) autofocus method using light coming in through a photographing lens. The autofocus module detects whether the subject is in focus by using a contrast detection method, a phase difference detection method, or the like. In TTL autofocus, a submirror is used to guide the light coming through the shooting lens to the autofocus module.

Generally, the AF area indicating the area that can be measured by the auto focus module is smaller than the imaging area. This is because the size of the submirror must be structurally limited. Accordingly, studies are being made to increase the AF area. An error occurs in the autofocus due to manufacturing tolerances that arise in manufacturing the optical components used in the imaging device or assembly tolerances that occur in assembling the optical components. Accordingly, there is a need to develop a robust imaging device for manufacturing tolerances and assembly tolerances. As the auto focus module is used in the imaging device, the size of the imaging device increases. When a consumer purchases an imaging device, the size of the imaging device becomes a very important factor. Accordingly, attempts have been made to reduce the size of the auto focus module.

The present invention for solving the conventional problems as described above is an auto focusing device that enables the inspection apparatus to recognize the defect of the inspection object more clearly as the precise focus adjustment is made by real-time grasping the trend for each coordinate of the inspection object The purpose is to provide.

Another object of the present invention is to provide an autofocusing apparatus capable of changing the inspection range in real time while performing automatic focusing adjustment.

It is another object of the present invention to provide an autofocusing apparatus capable of increasing the size of an autofocusing region and realizing a compact inspection apparatus as a whole.

According to an aspect of the present invention provided to achieve the above object is to be mounted to the inspection apparatus for the automatic focus control of the inspection camera for performing the vision inspection, at least arranged to pass the reflected light reflected from the inspection object A lens assembly including one lens and an inclined section disposed on a traveling path of reflected light passing through the lens assembly and eccentric with the lens assembly to rotate in one direction, the thickness of which gradually increases along the direction of rotation; A light transmitting material rotating part configured to convert optical density in real time, a photographing part arranged on a traveling path of reflected light passing through the rotating part to obtain an image, and receiving an image photographed by the photographing part A reading unit that determines whether or not the image is focused, and the inspection camera according to the determination of the reading unit. Between the target object and including a distance adjustment for adjusting the distance.

According to the auto focusing apparatus according to the present invention, by combining the calculated values of the multiple coordinates to grasp the tendency of the inspection object in real time to achieve precise focus adjustment to achieve a stable vision inspection, if the auto focus adjustment is made, Since the inspection range can be changed, not only the productivity is significantly improved, but the size of the auto focusing area can be increased, and the inspection apparatus can be miniaturized as a whole.

1 is a schematic diagram of an auto focusing apparatus according to the present invention;
2 is a perspective view taken from the rotating part of FIG.
3 is a graph showing a tendency of the sum of the absolute values of the intensity (I) difference according to the sharpness of each coordinate of the image obtained by the photographing unit of FIG.
4 is a partially enlarged view showing coordinates of an image acquired by the photographing unit of FIG. 1.

Hereinafter, the configuration and operation of the present invention auto focusing apparatus according to the accompanying drawings in more detail.

1 is a schematic diagram of an auto focusing apparatus according to the present invention, FIG. 2 is a perspective view taken from the rotating unit of FIG. 1, and FIG. 3 is an intensity (I) according to the sharpness of each coordinate of an image obtained by the photographing unit of FIG. 1. ) Is a graph showing the tendency of the sum of the absolute values of the differences, and 4 is a partial enlarged view showing the coordinates of the image acquired by the photographing unit of FIG. 1.

The present invention relates to an auto focusing apparatus (100), and is mounted on an inspection apparatus (10) having an inspection camera (20) for performing vision inspection of inspection objects in cell and module forms including various panels. As described above, the auto focusing apparatus 100 according to the present invention may be applied to inspect an inspection object in a cell or module form including various panels. However, the vision inspection of the LCD panel 1 may be used as an example to help understand the invention. It will be described for example, but the present invention is not limited thereto.

As described above, the auto focusing apparatus 100 according to an exemplary embodiment of the present invention includes a lens assembly 110 including at least one lens 111 disposed to pass reflected light reflected from the LCD panel 1, and the lens. It is disposed on the traveling path of the reflected light passing through the assembly 110, is rotated in one direction eccentric with the lens assembly 110, there is provided an inclined section that gradually increases the thickness along the rotation direction optical density (optical density) ) Is a light transmitting material rotating part 120 to convert in real time, a photographing unit 130 is disposed on the traveling path of the reflected light passing through the rotating unit 120 to obtain the image, and the photographing unit 130 The readout unit 140 determines whether or not the focus is received by receiving the image captured by the control unit, and adjusts the interval between the inspection camera 20 and the LCD panel 1 in accordance with the determination of the readout unit 140 Including distance adjuster 150 .

First, the lens assembly 110 is arranged to pass through the reflected light output from the light source included in the inspection apparatus 10 and reflected from the LCD panel 1, and to collect the reflected light and output the parallel light. do.

The inspection apparatus 10 equipped with the auto focusing apparatus 100 is not only an inspection main camera for determining whether the reflected light reflected from the LCD panel 1 is defective in the LCD panel 1 as described above, Light splitting means 30, such as a beam splitter, may be mounted to be incident on the lens assembly 110, and the reflected light split through the light splitting means 30 may be reflected mirror 160, or the like. Reflected through the lens assembly 110 through.

The rotating part 120 is made of a light transmissive material, is disposed on the path of the reflected light passing through the lens assembly 110, eccentric with the lens assembly 110 to rotate in one direction, the thickness along the direction of rotation Is gradually provided to increase the optical density in real time.

That is, as the thickness of the rotating part 120 through which the reflected light passes while the rotating part 120 rotates is gradually changed, the light density of the reflected light may be increased or decreased. As described above, the rotation axis of the rotating unit 120 is eccentric with the center of the lens assembly 110. Therefore, when the rotating part 120 is rotated, the light density of the reflected light passing through the rotating part 120 may be changed by changing the thickness of the inclined section.

The photographing unit 130 is disposed on a traveling path of the reflected light passing through the rotating unit 120 to acquire the image. The photographing unit 130 may adopt a CCD as the photographing unit 130. The photographing unit 130 detects a signal of the reflected light and converts the signal into an electrical signal having the same information. CCD (Charge-Coupled Device) is a sensor that converts light into electric charge to obtain an image, which is also called a charge-coupled device. A CCD is composed of a circuit in which a plurality of capacitors are interconnected in pairs, and each capacitor in the circuit carries charge allotted to its surrounding accumulator. A CCD chip is a chip in which many photodiodes are gathered. When light is emitted to each photodiode, electrons are generated according to the amount of photons, and the amount of electrons of the photodiode represents the brightness of the light, thereby reconstructing the information to form image information that forms a screen. In addition, it is needless to say that CMOS may be applied to the photodetector instead of the CCD.

The reading unit 140 receives the image photographed by the photographing unit 130 and determines whether focus is achieved. According to a preferred embodiment of the present invention, the photographing unit 130 obtains two or more frames at regular intervals.

The reading unit 140 obtains the intensity I according to the sharpness of each of the x and y coordinates based on the image information acquired by the photographing unit 130, and calculates the difference of the intensity I according to the sharpness of the coordinates. Next, sum the absolute values. In other words, assuming that the coordinates are in the order of (x, y), (x + 1, y + 1), ... as shown in FIG. 4, the intensity (I) according to the sharpness of each coordinate is measured and After calculating the absolute value of the difference between the neighboring coordinates, the sum is finally summed to obtain the f value as in the following equation.

Figure pat00001

The photographing unit 130 acquires two or more frames at regular intervals, and the image obtained with the difference in time (T1, T2, T3 ...) as described above is operated by the rotating unit 120. Since the light density is different, different sharpnesses appear for each image. Accordingly, the f value also changes.

That is, when three images are acquired at the time points T1, T2, and T3 at regular time intervals, the value of f (T1), the value of f (T2), and the value of f (T3) are different from each other. These results are shown in the form of a normal distribution as shown in FIG. As a result, the f value becomes larger as the focal point fits better, and the normal distribution is exhibited. The f value has the normal distribution where the focal point fits the best one, and the f value gradually decreases before and after. Therefore, the value of f (T1), f (T2), and f (T3) over time are compared with the normal distribution graph, and the trend is determined. Prediction, through which the distance between the inspection camera 20 and the LCD panel 1 should be adjusted how much can be determined. Therefore, the normal distribution stored in the storage medium provided in the reading unit 140 is used as a comparison factor that serves as a reference value for the later auto focus adjustment.

The distance adjusting unit 150 is provided to adjust the distance between the inspection camera 20 and the LCD panel 1 according to the determination of the reading unit 140. The distance adjusting unit 150 may include a driving means such as a motor to move the inspection camera 20, and automatically adjusts the motor focus according to the determination of the reading unit 140. On the other hand, the inspection apparatus 10 includes a defect detection means for detecting a defect pattern in the LCD panel 1, and a laser oscillation that oscillates a laser beam in a shorted portion when a short circuit failure occurs in the LCD panel 1. According to a preferred embodiment of the present invention, the photographing unit 130 may include a camera having a shooting speed of 3000fps or more.

According to a preferred embodiment of the present invention, the rotating part 120 is a hollow shape of the rotary ring 121 of the light transmitting material provided to gradually increase in the thickness along the direction of rotation, and the rotation ring 121 in one direction It includes a motor 122 for driving rotation. First, the rotating ring 121 is made of a light transmissive material that is light transmissive, and is disposed on a path of the reflected light passing through the lens assembly 110. At this time, the rotation ring 121 is eccentric with the lens assembly 110, but is rotated in one direction, there is provided a slope section that gradually increases in thickness along the rotation direction to convert optical density in real time (optical density) Prepared.

The motor 122 is configured to rotate the rotation ring 121 in one direction. At this time, the rotation speed of the motor 122 is two or more images of the LCD panel while the photographing unit 130 is stopped. One round is made during the acquisition. That is, as the rotation ring 121 rotates by the action of the motor 122, the thickness of the rotation ring 121 through which the reflected light passes gradually changes, so that the light density of the reflected light may increase or decrease. As described above, the rotation shafts of the rotation ring 121 and the motor 122 are eccentric with the center of the lens assembly 110. Therefore, when the rotating ring 121 is rotated, the light density of the reflected light passing through the rotating ring 121 may be changed by changing the thickness of the inclined section.

According to the present invention as described above, by combining the calculated values of the multiple coordinates in real time to grasp the tendency of the inspection object, such as the LCD panel to achieve precise focusing to achieve a stable vision inspection, the action of the auto focusing device When the focus adjustment is made, the inspection range can be changed in real time, not only the productivity is remarkably improved, but the size of the auto focusing area can be increased, and the inspection apparatus can be miniaturized as a whole.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is clearly understood that the same is by way of illustration and example only and is not to be taken by way of limitation and that those skilled in the art will recognize that various modifications and equivalent arrangements may be made therein. It will be possible. Accordingly, the true scope of protection of the present invention should be determined only by the appended claims.

10: inspection device
20: inspection camera
100: auto focusing device
110: lens assembly
111: Lens
120:
121: rotating ring
122: motor
130: the shooting unit
140: reading unit
150: distance control unit

Claims (3)

In the auto focusing device mounted on the inspection device for the automatic focusing of the inspection camera for performing the vision inspection,
A lens assembly including at least one lens disposed to pass reflected light reflected from an inspection object;
It is disposed on the path of the reflected light passing through the lens assembly, and is rotated in one direction eccentric with the lens assembly, there is provided an inclined section that gradually increases in thickness along the rotational direction optical density (optical density) in real time Rotating part of the transparent material to convert;
A photographing unit disposed on a traveling path of the reflected light passing through the rotating unit to obtain an image thereof;
A reading unit which receives the image photographed by the photographing unit and determines whether focus is achieved;
And a distance adjusting unit for adjusting a distance between the inspection camera and the inspection object according to the determination of the reading unit. The method of claim 1, wherein the rotating unit
A rotating ring made of a light-transmissive material provided to gradually increase in thickness along a rotational direction in a hollow shape;
And a motor for rotating and rotating the rotary ring in one direction. The method of claim 1, wherein the photographing unit
An auto focusing apparatus, characterized in that at least two frames are acquired at regular intervals.
KR1020110093101A 2011-09-15 2011-09-15 Auto focusing apparatus KR20130029681A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
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Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20160108069A (en) 2015-03-06 2016-09-19 (주) 인텍플러스 auto focusing apparatus using slitbeam and auto focusing method using thereof

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20160108069A (en) 2015-03-06 2016-09-19 (주) 인텍플러스 auto focusing apparatus using slitbeam and auto focusing method using thereof

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