CN108037139A - A kind of CCD detection methods of light diffusing sheet - Google Patents
A kind of CCD detection methods of light diffusing sheet Download PDFInfo
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- CN108037139A CN108037139A CN201711006052.XA CN201711006052A CN108037139A CN 108037139 A CN108037139 A CN 108037139A CN 201711006052 A CN201711006052 A CN 201711006052A CN 108037139 A CN108037139 A CN 108037139A
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- diffusing sheet
- light diffusing
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- stain
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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
- G01N21/95—Investigating the presence of flaws or contamination characterised by the material or shape of the object to be examined
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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
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/59—Transmissivity
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Abstract
A kind of CCD detection devices of light diffusing sheet, including：Light diffusing sheet is transmitted to detection platform, position sensor detection diffusion Board position, opening LED light source, CCD camera collection image, image analyzer analysis image.Wherein sensor can accurately perceive the size of light diffusing sheet, according to the scan frequency of the size adjust automatically CCD camera of light diffusing sheet, accurately detect the light transmittance of light diffusing sheet, determine the size of the position of stain and stain in light diffusing sheet.The present invention is applied widely, easy to use, detection is accurate.
Description
Technical field
The invention belongs to the CCD detection devices of field of optical detection, specially a kind of light diffusing sheet.
Background technology
Light diffusing sheet is the diffusion layer for plastic basis material with PMMA/PC/PE/PS/PP/PVC/PFT etc., is added in the substrate
Inorganic or organic light diffusing agent, when light passes through light diffusing sheet, when running into the diffusion particle different with its refractive index, it may occur that
Multi-direction, multi-angle refraction, reflection and scattering phenomenon, optics diffusion effect is obtained with this.Light diffusing sheet has certain
Property requirements, such as antistatic property, light transmittance, mist degree, it requires that its material and diffusion particle therein mix a variety of material agent, its
The light transmittance of middle light diffusing sheet refers to the ratio between luminous flux for passing through the luminous flux of sample and being mapped on sample, is represented with percentage；
The mist degree of light diffusing sheet refers to pass through sample and deviate the ratio between scatter light flux and transmitted light flux of incident light direction, uses percentage
Number represents, under normal conditions the scatter light flux for deviateing more than 2.5 degree of incident light direction is used to calculate mist degree, mist degree and printing opacity
Rate is often inversely.
With commonly used, the normal conditions also higher and higher to the manufacturing technique requirent of diffuser plate of diffuser plate in recent years
Under, the detection of diffuser plate appearance predominantly detects bubble, salient point, impurity, the miscellaneous line in surface etc., for spreading board finished product under conventional situation
Detection be mostly the detection of artificial microscope method, not only labor intensive, detection time length, accuracy of detection also have this method
It is short of；In addition, the yields of finished product can only be also detected using automatic detection device, it is impossible to be accurately detected in each product
Underproof position and the size of unqualified position.
The content of the invention
In order to solve the above-mentioned technical problem, the present invention proposes a kind of CCD detection methods of light diffusing sheet, including：Transmit light
Diffuser plate to detection platform, position sensor detection diffusion Board position, opening LED light source, CCD camera collection image, image divides
Parser analyzes image.Wherein sensor can accurately perceive the size of light diffusing sheet, be adjusted automatically according to the size of light diffusing sheet
The scan frequency of whole CCD camera, accurately detects the light transmittance of light diffusing sheet, determines in light diffusing sheet the position of stain and black
The size of point.The present invention is applied widely, easy to use, detection is accurate.
A kind of CCD detection methods of light diffusing sheet, including：Light diffusing sheet to detection platform, position sensor is transmitted to detect
Spread Board position, open LED light source, CCD camera collection image, image analyzer analysis image.
Light diffusing sheet is transmitted to detection platform：Light diffusing sheet is sent in detection platform by transfer table, it is described
A length of 0.8m~1.2m of light diffusing sheet, width are 0.6m~0.8m；A length of 1.2m~1.5m of detection platform, width for 0.8m~
1.0m。
Position sensor detection diffusion Board position：Position sensor is mounted with detection platform, the sensor can be right
Accurately detected the position of light diffusing sheet.
Open LED light source：Using sensor as object of reference, when the rear end of light diffusing sheet is just through sensor, sensor
An acoustical signal is sent, LED light source is opened, and for gathering image light filling to CCD camera, is carried in addition to measurement light diffusing sheet light transmittance
For uniform source of light.Preferably, the LED light source is that line clears off at least one of source, strip source, point light source.
CCD camera gathers image：After LED light source is opened, CCD camera starts to carry out Image Acquisition to light diffusing sheet.CCD
It is charge coupled cell, optical image can be converted into digital signal, the small photoactive substance being implanted on CCD is known as pixel,
The pixel included on one piece of CCD is more, and the screen resolution that it is provided is higher.Under normal conditions, CCD camera 3 mainly has linear array
CCD camera and area array CCD camera, it is preferred that Image Acquisition mainly sweeps camera using line, and compared with area array cameras, line sweeps phase
Machine only has the photosensitive element of a line, therefore line sweeps camera has high scan frequency and high-resolution.Regard diffuser plate as one to put down
Space of planes, with a length of X-direction of diffuser plate, width is Y-direction, and X-direction and Y-direction are divided into equidistant section by scanning every time,
The length range in each section is 1 μm~5 μm, i.e. the minimum unit of the seizure that CCD camera scans every time for diffuser plate is 1 μ
m2~25 μm2.Line sweeps camera with X-axis (Y-axis) as fixed direction, is progressively scanned with Y-axis (X-axis) for scanning direction, camera
Scanned forward with the frequency of 7000 times/s~9000 time/s.
Image analyzer analyzes image:After CCD camera Image Acquisition is complete, image analyzer analyzes image, leads to
Cross and analyze the light transmittance of each point on image to sentence stain position on section diffuser plate, as light transmittance ＜ 55%, judge in light
There is stain in the place section of diffuser plate, and according to light transmittance all X-axis of ＜ 55% and Y-axis scope, to calculate the big of stain
It is small.
Using the CCD detection devices of light diffusing sheet as described above, clearly the black of light diffusing sheet can be found out from image
Point position and stain size.Specifically, irradiating light diffusing sheet by LED light source, CCD camera gathers the printing opacity of light diffusing sheet
Rate, image analyzer analyze the light transmittance for gathering image regional, and light transmittance is less than 55%, it is believed that stain is where there is,
The size of stain further is gone out to the contrast conting of picture element module.
Brief description of the drawings：
Fig. 1 is the overall structure figure of the present invention.
Primary structure number explanation
| LED light source | 1 |
| Detection platform | 2 |
| CCD camera | 3 |
| Sensor | 4 |
| Image analyzer | 5 |
| PLC programmable logic controller (PLC)s | 6 |
Following embodiment will combine above-mentioned attached drawing and further illustrate the present invention.
Embodiment
Case 1 is embodied：
A kind of CCD detection methods of light diffusing sheet, including：Light diffusing sheet to detection platform, position sensor is transmitted to detect
Spread Board position, open LED light source, CCD camera collection image, image analyzer analysis image.
Light diffusing sheet is transmitted to detection platform：Light diffusing sheet is sent in detection platform by transfer table.
Position sensor detection diffusion Board position：Position sensor is mounted with detection platform, the sensor can be right
Accurately detected the position of light diffusing sheet.
Open LED light source：Using sensor as object of reference, when the rear end of light diffusing sheet is just through sensor, sensor
An acoustical signal is sent, LED light source is opened.
CCD camera gathers image：After LED light source is opened, CCD camera starts to carry out Image Acquisition to light diffusing sheet.
Image analyzer analyzes image:After CCD camera Image Acquisition is complete, image analyzer analyzes image, leads to
Cross and analyze the light transmittance of each point on image to sentence stain position and stain size on section diffuser plate.
Wherein the length of light diffusing sheet is 1m, width 0.6m, by the X of light diffusing sheet and Y-direction segmentation minimum unit 1um
The space of × 1um, CCD camera carry out light diffusing sheet Image Acquisition, and impact analysis device analyzes diffuser plate light transmittance ＜'s 55%
Region is stain position, the position of stain one：X-direction scope 10um~12.8um, Y-direction scope 18.6um~19.6um are black
One size 2.8um of point2；The position of stain two：X-direction scope 900058um~900060um, Y-direction scope 500058um~
500060um, two size 4um of stain2。
Case 2 is embodied：
A kind of CCD detection methods of light diffusing sheet, including：Light diffusing sheet to detection platform, position sensor is transmitted to detect
Spread Board position, open LED light source, CCD camera collection image, image analyzer analysis image.
Light diffusing sheet is transmitted to detection platform：Light diffusing sheet is sent in detection platform by transfer table.
Position sensor detection diffusion Board position：Position sensor is mounted with detection platform, the sensor can be right
Accurately detected the position of light diffusing sheet.
Open LED light source：Using sensor as object of reference, when the rear end of light diffusing sheet is just through sensor, sensor
An acoustical signal is sent, LED light source is opened.
CCD camera gathers image：After LED light source is opened, CCD camera starts to carry out Image Acquisition to light diffusing sheet.
Image analyzer analyzes image:After CCD camera Image Acquisition is complete, image analyzer analyzes image, leads to
Cross and analyze the light transmittance of each point on image to sentence stain position and stain size on section diffuser plate.
Wherein the length of light diffusing sheet is 1m, width 0.78m, and the X of light diffusing sheet and Y-direction are split minimum unit
The space of 1um × 1um, CCD camera carry out light diffusing sheet Image Acquisition, and impact analysis device analyzes diffuser plate light transmittance ＜ 55%
Region be stain position, the position of stain one：X-direction scope 38um~45um, Y-direction scope 18.6um~19.6um are black
One size 7um of point2；The position of stain two：X-direction scope 900000um~900012um, Y-direction scope 16um~16.5um,
Two size 6um of stain2。
Case 3 is embodied：
A kind of CCD detection methods of light diffusing sheet, including：Light diffusing sheet to detection platform, position sensor is transmitted to detect
Spread Board position, open LED light source, CCD camera collection image, image analyzer analysis image.
Light diffusing sheet is transmitted to detection platform：Light diffusing sheet is sent in detection platform by transfer table.
Position sensor detection diffusion Board position：Position sensor is mounted with detection platform, the sensor can be right
Accurately detected the position of light diffusing sheet.
Open LED light source：Using sensor as object of reference, when the rear end of light diffusing sheet is just through sensor, sensor
An acoustical signal is sent, LED light source is opened.
CCD camera gathers image：After LED light source is opened, CCD camera starts to carry out Image Acquisition to light diffusing sheet.
Image analyzer analyzes image:After CCD camera Image Acquisition is complete, image analyzer analyzes image, leads to
Cross and analyze the light transmittance of each point on image to sentence stain position and stain size on section diffuser plate.
Wherein the length of light diffusing sheet is 0.85m, width 0.78m, by the X of light diffusing sheet and the minimum list of Y-direction segmentation
The space of first 1um × 1um, CCD camera carry out light diffusing sheet Image Acquisition, and impact analysis device analyzes diffuser plate light transmittance ＜
55% region is stain position, the position of stain one：X-direction scope 10um~10.5um, Y-direction scope 18um~20um,
One size 1um of stain2；The position of stain two：X-direction scope 800000um~800002um, Y-direction scope 16um~17um,
Two size 2um of stain2。
Embodiment described above only expresses the several embodiments of the present invention, its description is more specific and detailed, but simultaneously
Therefore the limitation to the scope of the claims of the present invention cannot be interpreted as.It should be pointed out that for those of ordinary skill in the art
For, without departing from the inventive concept of the premise, various modifications and improvements can be made, these belong to the guarantor of the present invention
Protect scope.Therefore, the protection domain of patent of the present invention should be determined by the appended claims.
Claims (6)
1. a kind of CCD detection methods of light diffusing sheet, including：
Light diffusing sheet is transmitted to detection platform：Light diffusing sheet is sent in detection platform by transfer table；
Position sensor detection diffusion Board position：Position sensor is mounted with detection platform, the sensor can expand light
Accurately detected the position fallen apart；
Open LED light source：Using sensor as object of reference, when the rear end of light diffusing sheet is just through sensor, sensor is sent
One acoustical signal, LED light source are opened.
CCD camera gathers image：After LED light source is opened, CCD camera starts to carry out Image Acquisition to light diffusing sheet.
Image analyzer analyzes image:After CCD camera Image Acquisition is complete, image analyzer analyzes image, by dividing
The light transmittance for separating out each point on image sentences stain position and stain size on section diffuser plate.
2. the CCD detection methods of light diffusing sheet as claimed in claim 1, it is characterised in that：The light diffusing sheet it is a length of
0.8m~1.2m, width are 0.6m~0.8m；A length of 1.2m~1.5m of detection platform, width are 0.8m~1.0m.
3. the CCD detection methods of light diffusing sheet as claimed in claim 1, it is characterised in that：The LED light source be used for pair
CCD camera gathers image light filling, provides uniform source of light to measurement light diffusing sheet light transmittance in addition.
4. the CCD detection methods of light diffusing sheet as claimed in claim 1, it is characterised in that：The LED light source is that line clears off
At least one of source, strip source, point light source.
5. the CCD detection methods of the light diffusing sheet as described in Claims 1 to 4, it is characterised in that：The image analyzer point
During analysing image, regard diffuser plate as a plane space, with a length of X-direction of diffuser plate, width is Y-direction, is swept every time
Retouch and X-direction and Y-direction are divided into equidistant section, the length range in each section is 1 μm~5 μm, i.e., CCD camera is for expansion
Fall apart the seizure scanned every time minimum unit be 1 μm2~25 μm2, line sweeps camera with X-axis (Y-axis) as fixed direction, with Y-axis
(X-axis) is progressively scanned for scanning direction, and camera is scanned forward with the frequency of 7000 times/s~9000 time/s.
6. the CCD detection methods of the light diffusing sheet as described in Claims 1 to 4, it is characterised in that：The image analyzer leads to
The light transmittance of light diffusing sheet is crossed to judge the position of stain and size, as light transmittance ＜ 55%, judges the institute in light diffusing sheet
There is stain in section, and according to light transmittance all X-axis of ＜ 55% and Y-axis scope, to calculate the size of stain.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711006052.XA CN108037139A (en) | 2017-10-25 | 2017-10-25 | A kind of CCD detection methods of light diffusing sheet |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711006052.XA CN108037139A (en) | 2017-10-25 | 2017-10-25 | A kind of CCD detection methods of light diffusing sheet |
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| Publication Number | Publication Date |
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| CN108037139A true CN108037139A (en) | 2018-05-15 |
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| CN201711006052.XA Pending CN108037139A (en) | 2017-10-25 | 2017-10-25 | A kind of CCD detection methods of light diffusing sheet |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111921883A (en) * | 2020-06-08 | 2020-11-13 | 嘉兴市品鼎电器有限公司 | Qualified product detection device for diffusion plate |
| CN111982475A (en) * | 2020-08-24 | 2020-11-24 | 宁波舜宇奥来技术有限公司 | Diffusion sheet detection device and control and processing method |
| CN116577348A (en) * | 2023-07-07 | 2023-08-11 | 深圳市诚誉兴光电有限公司 | Diffusion plate AOI detection device and detection method |
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| CN1689387A (en) * | 2002-10-01 | 2005-10-26 | 美陆技术株式会社 | Vision inspection apparatus using a full reflection mirror |
| CN1845985A (en) * | 2003-09-04 | 2006-10-11 | 3M创新有限公司 | Biological growth plate scanner with automated intake |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111921883A (en) * | 2020-06-08 | 2020-11-13 | 嘉兴市品鼎电器有限公司 | Qualified product detection device for diffusion plate |
| CN111982475A (en) * | 2020-08-24 | 2020-11-24 | 宁波舜宇奥来技术有限公司 | Diffusion sheet detection device and control and processing method |
| CN116577348A (en) * | 2023-07-07 | 2023-08-11 | 深圳市诚誉兴光电有限公司 | Diffusion plate AOI detection device and detection method |
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Application publication date: 20180515 |