CN104567737A - Axis determination method of panda-type polarization-maintaining optical fiber end surface - Google Patents
Axis determination method of panda-type polarization-maintaining optical fiber end surface Download PDFInfo
- Publication number
- CN104567737A CN104567737A CN201410817567.8A CN201410817567A CN104567737A CN 104567737 A CN104567737 A CN 104567737A CN 201410817567 A CN201410817567 A CN 201410817567A CN 104567737 A CN104567737 A CN 104567737A
- Authority
- CN
- China
- Prior art keywords
- opal
- marginal point
- fiber end
- circle
- point set
- Prior art date
- Legal status (The legal status 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 status listed.)
- Granted
Links
Landscapes
- Treatment Of Fiber Materials (AREA)
Abstract
The invention discloses an axis determination method of a panda-type polarization-maintaining optical fiber end surface. An end surface image of a panda-type optical fiber is collected, an optical fiber cladding circle parameter is obtained after binaryzation of the image, edge detection and circle fitting, edge points of two panda eyes are obtained through the cladding circle parameter as well as a geometric size and a distribution feature of the panda-type polarization-maintaining optical fiber end surface, circle center parameters of the two panda eyes are obtained through fitting, then the angle of a current polarization axis of the optical fiber is obtained through calculation, and axis determination of the panda-type polarization-maintaining optical fiber end surface is achieved. According to the axis determination method, the edge points of the two panda eyes can be accurately and quickly extracted from an edge image of the optical fiber end surface, fitting calculation of the parameters of the panda eyes can be directly performed, the calculation amount and the operation time of axis determination of the polarization-maintaining optical fiber are substantially reduced, the polarization axis of the panda-type polarization-maintaining optical fiber can be accurately and quickly determined, and the method applies to a situation with a higher requirement for instantaneity of an axis determination process.
Description
Technical field
The present invention relates to a kind of optical fiber axis fixation method of photoelectron technology, particularly relate to a kind of panda type polarization-preserving fiber end face axis fixation method of sensory field of optic fibre.
Background technology
Polarization maintaining optical fibre is the special optical fiber that a class has significant application value, has stronger polarization hold facility, be widely used in optical communication and sensory field of optic fibre to the polarized light vibrated along its polarization axis direction.
In the application of polarization maintaining optical fibre, in the manufacturing process of especially polarization-preserving optical fibre device, there is higher accuracy requirement to the coupling of two polarization maintaining optical fibre polarization axles or welding angle, therefore accurately determine that the polarization axle of polarization maintaining optical fibre is a gordian technique in its application.
Utilize the method for image processing techniques determination polarization maintaining optical fibre polarization axle to be divided into side-looking imaging method and end face imaging method two kinds, side-looking imaging method has imaging surface required distance strict, the shortcoming that dead axle error is large.
For end face imaging method dead axle, current domestic existing Patents relates to, and only mentions and carry out feature identification to polarization maintaining optical fibre end view drawing picture in patent CN103645537A, but does not set forth and to identify which feature and to carry out the step and method of feature identification; Patent CN103308978A proposes a kind of based on the method for end view drawing picture to panda type polarization-preserving fiber dead axle, Hough circle transformation is wherein used to carry out opal detection, there is operand large, the shortcoming that computing time is long, be unsuitable for the occasion higher to dead axle process requirement of real-time.
Summary of the invention
In order to solve Problems existing in background technology, the present invention proposes a kind of panda type polarization-preserving fiber end face axis fixation method, utilize the end view drawing picture of panda type polarization-preserving fiber, take into full account physical dimension and the distribution characteristics of panda type polarization-preserving fiber end face, dead axle precision is high, method real-time is good.
The technical solution used in the present invention is as follows:
1) Image semantic classification: panda type polarization-preserving fiber end view drawing, as ImSorce, with image upper left angle point for initial point sets up rectangular coordinate system, is converted to gray level image ImGray as ImSorce by the panda type polarization-preserving fiber end view drawing obtaining imaging clearly;
2) covering Circle Parameters detects: transfer gray level image ImGray to binary image ImBin by setting background gray threshold, wherein the gray-scale value of fiber section is 255, and the gray-scale value of background parts is 0; Carry out to the binary image ImBin obtained the covering marginal point that rim detection obtains fiber end face, recycling least square method is carried out justifying matching and is obtained the fiber end face covering center of circle (x
0, y
0) and radius r
0, x
0, y
0be respectively the horizontal stroke in the fiber end face covering center of circle, ordinate;
3) opal marginal point extracts: to step 1) the gray level image ImGray that obtains carries out Canny rim detection and obtains fiber end face edge image ImDetected, in scanning optical fiber end face edge image ImDetected, gray-scale value is all pixel (x of 255, y) and judge obtain opal marginal point set P, x, y are respectively horizontal stroke, the ordinate of pixel;
4) opal marginal point is separated: by judging the coordinate information of each opal marginal point, opal marginal point set P is divided into the first opal marginal point set P1 and the second opal marginal point set P2;
5) opal center of circle matching: utilize least square method to justify matching respectively to the first opal marginal point set P1 obtained and the second opal marginal point set P2, obtain the central coordinate of circle (x of the first opal respectively
1, y
1) and the central coordinate of circle (x of the second opal
2, y
2), x
1, y
1be respectively the horizontal stroke of the central coordinate of circle of the first opal, ordinate, x
2, y
2be respectively the horizontal stroke of the central coordinate of circle of the second opal, ordinate;
6) polarization axle angle is calculated: if x
1=x
2, then current polarization axle angle θ=90 ° of panda type polarization-preserving fiber; If
then adopt formula
calculate the current polarization axle angle θ of panda type polarization-preserving fiber, complete the dead axle of panda type polarization-preserving fiber end face.
Described step 3) in opal marginal point set P judge to obtain by with under type: if gray-scale value is any pixel (x, y) and the fiber end face covering center of circle (x of 255 in fiber end face edge image ImDetected
0, y
0) distance meet following formula, and with this pixel (x, y) with the fiber end face covering center of circle (x
0, y
0) a centrosymmetric pixel (2x
0-x, 2y
0-y) gray-scale value be 255, then this pixel (x, y) is opal marginal point, all opal marginal points composition opal marginal point set P:
Wherein, r
min=9 × r
0/ 125+5, r
max=95 × r
0/ 135, r
0for step 2) in the covering radius of circle of trying to achieve.
Described step 4) specifically adopt following methods: to calculate in opal marginal point set P all marginal points respectively to the covering center of circle (x
0, y
0) horizontal direction distance average d
1with vertical direction distance average d
2if: d
1<d
2, then allly in opal marginal point set P y>y is met
0opal marginal point form the first opal marginal point set P1, allly meet y≤y
0opal marginal point form the second opal marginal point set P2; If d
1>=d
2then allly in opal marginal point set P meet x>x
0opal marginal point form the first opal marginal point set P1, allly meet x≤x
0opal marginal point form the second opal marginal point set P2.
The invention has the beneficial effects as follows:
The present invention, by gathering the end view drawing picture of panda type polarization-preserving fiber and taking into full account physical dimension and the distribution characteristics of panda type polarization-preserving fiber end face, has the advantage that dead axle precision is high, operation time is few, is applicable to the occasion higher to dead axle process requirement of real-time.
Accompanying drawing explanation
Fig. 1 is panda type polarization-preserving fiber end face gray level image.
Fig. 2 is the bianry image for covering rim detection.
Fig. 3 is panda type polarization-preserving fiber covering marginal point image.
Fig. 4 is panda type polarization-preserving fiber end face edge image.
Fig. 5 is the opal marginal point image extracted.
Fig. 6 is isolated first opal marginal point image.
Fig. 7 is isolated second opal marginal point image.
Fig. 8 is opal parametric fitting results schematic diagram.
Embodiment
Below in conjunction with drawings and Examples, the invention will be further described.
Embodiments of the invention are as follows:
The present invention obtains the panda type polarization-preserving fiber end view drawing of imaging clearly as ImSorce, with image upper left angle point for initial point sets up rectangular coordinate system, panda type polarization-preserving fiber end view drawing is converted to gray level image ImGray as ImSorce, as shown in Figure 1.Transfer gray level image ImGray to binary image ImBin by setting background gray threshold, as shown in Figure 2, wherein the gray-scale value of fiber section is 255, and the gray-scale value of background parts is 0.Carry out to the binary image ImBin obtained the covering marginal point that rim detection obtains fiber end face, recycling least square method is carried out justifying matching and is obtained the fiber end face covering center of circle (149,149) and radius 135, and covering marginal point image as shown in Figure 3.
Canny rim detection is carried out to gray level image ImGray and obtains fiber end face edge image ImDetected, as shown in Figure 4.In scanning optical fiber end face edge image ImDetected, gray-scale value is all pixels (x, y) of 255 and judges to obtain opal marginal point set P, and x, y are respectively horizontal stroke, the ordinate of pixel.Opal marginal point set P judges to obtain by with under type:
If gray-scale value is that any pixel (x, y) of 255 meets with the distance in the fiber end face covering center of circle (149,149) in fiber end face edge image ImDetected
and with this pixel (x, y) with the fiber end face covering center of circle (149,149) a centrosymmetric pixel (298-x, gray-scale value 298-y) is 255, then this pixel (x, y) be opal marginal point, all opal marginal point composition opal marginal point set P.Such as, point (108 in the present embodiment, 71) and point (190,227) distance to the covering center of circle (149,149) is 88, and these 2 about the covering center of circle (149,149) Central Symmetry, therefore point (108,71) and point (190,227) are member in set P.The membership gathering P in the present embodiment is 422.Use geometric position residing for opal marginal point in this step simultaneously and about the symmetry in the covering center of circle as constraint condition, the opal marginal point extracted as shown in Figure 5, comparison diagram 4 can be found out, this process, while accurately extracting opal marginal point, effectively eliminates the circumocular noise spot of cat.
Calculate in opal point set P and arrive a little the covering center of circle (x
0, y
0) mean value of horizontal direction distance is 41, the mean value of vertical direction distance is 39, due to comparatively large apart from horizontal direction distance average, therefore meets x>x by all in opal marginal point set P
0opal marginal point form the first opal marginal point set P1, allly meet x≤x
0opal marginal point form the second opal marginal point set P2.Separation obtains the marginal point image of two opals as Fig. 6, shown in Fig. 7, can find out that the marginal point of two opals can be separated by this process rapidly and accurately, without the need to carrying out loop truss in edge image, be separated the marginal point obtained and can directly carry out the matching of opal Circle Parameters, so significantly decrease calculated amount and the operation time of the detection of opal Circle Parameters, improve opal Circle Parameters detection efficiency.
Least square method is utilized to justify matching respectively to the first opal marginal point set P1 obtained and the second opal marginal point set P2, obtain the central coordinate of circle (106.51 of the first opal respectively, 109.07) central coordinate of circle (187.79 of and the second opal, 189.29), fitting result signal as shown in Figure 8, adopts formula
calculating the current polarization axle angle of panda type polarization-preserving fiber is 44.62 °, completes the dead axle of panda type polarization-preserving fiber end face.In the present embodiment, the computing time of whole dead axle process is 26.71ms, compared to existing methodical dead axle process computing time about 500ms more fast effectively, can meet the occasion that some are higher to dead axle process requirement of real-time, such as panda type polarization-preserving fiber is fast to axle fusion process.
Thus, the present invention is by gathering the end view drawing picture of panda type polarization-preserving fiber and taking into full account physical dimension and the distribution characteristics of panda type polarization-preserving fiber end face, the marginal point of two opals can be extracted quickly and accurately respectively from the edge image of fiber end face, directly carry out the calculating of opal parameter fitting, significantly decrease calculated amount and the operation time of polarization-preserving fiber axis fixing, realize the polarization axle accurately determining panda type polarization-preserving fiber rapidly, be applicable to the occasion higher to dead axle process requirement of real-time.
Claims (3)
1. a panda type polarization-preserving fiber end face axis fixation method, is characterized in that step is as follows:
1) Image semantic classification: the panda type polarization-preserving fiber end view drawing obtaining imaging clearly, as ImSorce, is set up rectangular coordinate system, panda type polarization-preserving fiber end view drawing is converted to gray level image ImGray as ImSorce;
2) covering Circle Parameters detects: transfer gray level image ImGray to binary image ImBin, wherein the gray-scale value of fiber section is 255, and the gray-scale value of background parts is 0; Carry out to the binary image ImBin obtained the covering marginal point that rim detection obtains fiber end face, recycling least square method carries out justifying the center of circle (x that matching obtains fiber end face covering
0, y
0) and radius r
0, x
0, y
0be respectively the horizontal stroke in the fiber end face covering center of circle, ordinate;
3) opal marginal point extracts: to step 1) the gray level image ImGray that obtains carries out Canny rim detection and obtains fiber end face edge image ImDetected, in scanning optical fiber end face edge image ImDetected, gray-scale value is all pixel (x of 255, y) and judge obtain opal marginal point set P, x, y are respectively horizontal stroke, the ordinate of pixel;
4) opal marginal point is separated: by judging the coordinate information of each opal marginal point, opal marginal point set P is divided into the first opal marginal point set P1 and the second opal marginal point set P2;
5) opal center of circle matching: utilize least square method to justify matching respectively to the first opal marginal point set P1 obtained and the second opal marginal point set P2, obtain the central coordinate of circle (x of the first opal respectively
1, y
1) and the central coordinate of circle (x of the second opal
2, y
2), x
1, y
1be respectively the horizontal stroke of the central coordinate of circle of the first opal, ordinate, x
2, y
2be respectively the horizontal stroke of the central coordinate of circle of the second opal, ordinate;
6) polarization axle angle is calculated: if x
1=x
2, then current polarization axle angle θ=90 ° of panda type polarization-preserving fiber; If x
1≠ x
2, then formula is adopted
calculate the current polarization axle angle θ of panda type polarization-preserving fiber, complete the dead axle of panda type polarization-preserving fiber end face.
2. a kind of panda type polarization-preserving fiber end face axis fixation method according to claim 1, its step is as follows: described step 3) in opal marginal point set P judge to obtain by with under type:
If gray-scale value is any pixel (x, y) of 255 and the fiber end face covering center of circle (x in fiber end face edge image ImDetected
0, y
0) distance meet following formula, and with this pixel (x, y) with the fiber end face covering center of circle (x
0, y
0) a centrosymmetric pixel (2x
0-x, 2y
0-y) gray-scale value be 255, then this pixel (x, y) is opal marginal point, all opal marginal points composition opal marginal point set P:
Wherein, r
min=9 × r
0/ 125+5, r
max=95 × r
0/ 135, r
0for step 2) in the radius of fiber end face covering of trying to achieve.
3. a kind of panda type polarization-preserving fiber end face axis fixation method according to claim 1, its step is as follows: described step 4) specifically adopt following methods: to calculate in opal marginal point set P all marginal points respectively to the covering center of circle (x
0, y
0) horizontal direction distance average d
1with vertical direction distance average d
2:
If d
1<d
2, then allly in opal marginal point set P y>y is met
0opal marginal point form the first opal marginal point set P1, allly meet y≤y
0opal marginal point form the second opal marginal point set P2;
If d
1>=d
2then allly in opal marginal point set P meet x>x
0opal marginal point form the first opal marginal point set P1, allly meet x≤x
0opal marginal point form the second opal marginal point set P2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410817567.8A CN104567737B (en) | 2014-12-24 | 2014-12-24 | Axis determination method of panda-type polarization-maintaining optical fiber end surface |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410817567.8A CN104567737B (en) | 2014-12-24 | 2014-12-24 | Axis determination method of panda-type polarization-maintaining optical fiber end surface |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104567737A true CN104567737A (en) | 2015-04-29 |
| CN104567737B CN104567737B (en) | 2017-05-10 |
Family
ID=53084362
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410817567.8A Expired - Fee Related CN104567737B (en) | 2014-12-24 | 2014-12-24 | Axis determination method of panda-type polarization-maintaining optical fiber end surface |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104567737B (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104849800A (en) * | 2015-06-09 | 2015-08-19 | 长飞（武汉）光系统股份有限公司 | Method for side imaging and automatic alignment positioning of panda-type polarization-maintaining optical fiber |
| CN105676356A (en) * | 2016-03-15 | 2016-06-15 | 中国工程物理研究院激光聚变研究中心 | Fiber core positioning method and fiber core alignment calibration method for optical fiber fusion |
| CN109146968A (en) * | 2018-07-25 | 2019-01-04 | 武汉光迅科技股份有限公司 | A kind of panda type polarization-preserving fiber end face axis fixation method and device |
| CN113219589A (en) * | 2021-04-07 | 2021-08-06 | 南京邮电大学 | Hoff gradient descent-based panda eye polarization maintaining optical fiber self-adaption axis aligning method |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5719639A (en) * | 1980-07-09 | 1982-02-01 | Nippon Telegr & Teleph Corp <Ntt> | Measuring device for end surface angle of optical fiber |
| JP2001194130A (en) * | 2000-01-07 | 2001-07-19 | Japan Aviation Electronics Industry Ltd | Apparatus for measuring polished angle of end face of optical fiber |
| WO2010039951A1 (en) * | 2008-10-01 | 2010-04-08 | Afl Telecommunications Llc | Method of aligning polarization-maintaining optical fiber by image profile analysis |
| CN103292731A (en) * | 2013-05-16 | 2013-09-11 | 浙江大学 | Geometrical parameter testing device and method used for panda-shaped polarization maintaining optical fiber end faces |
| CN103308978A (en) * | 2013-05-29 | 2013-09-18 | 北京航空航天大学 | Automatic polarization-maintaining optical fiber axis positioning system |
| CN103645537A (en) * | 2013-11-28 | 2014-03-19 | 北京浦丹光电技术有限公司 | Device based on polarization maintaining optical fiber end surface fixed axis and re-welding method of polarization maintaining optical fiber end surface fixed axis |
| CN103954240A (en) * | 2014-04-10 | 2014-07-30 | 浙江大学 | Method for measuring torsion angle of polarization-maintaining optical fiber based on spectral-domain OCT imaging system |
-
2014
- 2014-12-24 CN CN201410817567.8A patent/CN104567737B/en not_active Expired - Fee Related
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5719639A (en) * | 1980-07-09 | 1982-02-01 | Nippon Telegr & Teleph Corp <Ntt> | Measuring device for end surface angle of optical fiber |
| JP2001194130A (en) * | 2000-01-07 | 2001-07-19 | Japan Aviation Electronics Industry Ltd | Apparatus for measuring polished angle of end face of optical fiber |
| WO2010039951A1 (en) * | 2008-10-01 | 2010-04-08 | Afl Telecommunications Llc | Method of aligning polarization-maintaining optical fiber by image profile analysis |
| US20100209049A1 (en) * | 2008-10-01 | 2010-08-19 | Afl Telecommunications Llc | Image profile analysis (ipa) method for pm fiber alignment |
| CN103292731A (en) * | 2013-05-16 | 2013-09-11 | 浙江大学 | Geometrical parameter testing device and method used for panda-shaped polarization maintaining optical fiber end faces |
| CN103308978A (en) * | 2013-05-29 | 2013-09-18 | 北京航空航天大学 | Automatic polarization-maintaining optical fiber axis positioning system |
| CN103645537A (en) * | 2013-11-28 | 2014-03-19 | 北京浦丹光电技术有限公司 | Device based on polarization maintaining optical fiber end surface fixed axis and re-welding method of polarization maintaining optical fiber end surface fixed axis |
| CN103954240A (en) * | 2014-04-10 | 2014-07-30 | 浙江大学 | Method for measuring torsion angle of polarization-maintaining optical fiber based on spectral-domain OCT imaging system |
Non-Patent Citations (5)
| Title |
|---|
| 刘振华_等: "Panda型保偏光纤偏振轴检测技术", 《红外与激光工程》 * |
| 游建民_等: "Panda型保偏光纤偏振轴图像识别算法", 《中国图象图形学报》 * |
| 王睿_等: "基于图像处理的保偏光纤偏振轴高精度检测法", 《光电子.激光 》 * |
| 胡慧珠_等: "三种保偏光纤几何参数测量算法", 《红外与激光工程》 * |
| 裘建新_等: "基于计算机视觉的保偏双尾纤装配精度检测", 《上海交通大学学报 》 * |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104849800A (en) * | 2015-06-09 | 2015-08-19 | 长飞（武汉）光系统股份有限公司 | Method for side imaging and automatic alignment positioning of panda-type polarization-maintaining optical fiber |
| CN105676356A (en) * | 2016-03-15 | 2016-06-15 | 中国工程物理研究院激光聚变研究中心 | Fiber core positioning method and fiber core alignment calibration method for optical fiber fusion |
| CN105676356B (en) * | 2016-03-15 | 2019-03-01 | 中国工程物理研究院激光聚变研究中心 | A kind of localization method of fibre core and the fibre core of fused fiber splice align calibration method |
| CN109146968A (en) * | 2018-07-25 | 2019-01-04 | 武汉光迅科技股份有限公司 | A kind of panda type polarization-preserving fiber end face axis fixation method and device |
| CN109146968B (en) * | 2018-07-25 | 2021-05-11 | 武汉光迅科技股份有限公司 | Panda type polarization maintaining optical fiber end face axis fixing method and device |
| CN113219589A (en) * | 2021-04-07 | 2021-08-06 | 南京邮电大学 | Hoff gradient descent-based panda eye polarization maintaining optical fiber self-adaption axis aligning method |
| CN113219589B (en) * | 2021-04-07 | 2022-05-13 | 南京邮电大学 | Hoff gradient descent-based panda eye polarization maintaining optical fiber self-adaption axis aligning method |
Also Published As
| Publication number | Publication date |
|---|---|
| CN104567737B (en) | 2017-05-10 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN107369159B (en) | Threshold segmentation method based on multi-factor two-dimensional gray level histogram | |
| CN104567737A (en) | Axis determination method of panda-type polarization-maintaining optical fiber end surface | |
| CN104700072B (en) | Recognition methods based on lane line historical frames | |
| CN106558080A (en) | Join on-line proving system and method outside a kind of monocular camera | |
| CN101650777B (en) | Corresponding three-dimensional face recognition method based on dense point | |
| Huang et al. | Lane detection based on inverse perspective transformation and Kalman filter | |
| CN105205458A (en) | Human face living detection method, device and system | |
| CN104408724A (en) | Depth information method and system for monitoring liquid level and recognizing working condition of foam flotation | |
| CN102509098A (en) | Fisheye image vehicle identification method | |
| CN104792312A (en) | Indoor automatic transport vehicle positioning system with three fixed balls as visual marker | |
| CN104597057A (en) | Columnar diode surface defect detection device based on machine vision | |
| CN103927509A (en) | Eye locating method and device | |
| CN103440785B (en) | One is traffic lane offset warning method fast | |
| CN105354856A (en) | Human matching and positioning method and system based on MSER and ORB | |
| CN108154114B (en) | Lane line detection method | |
| CN105891231A (en) | Carrot surface defect detection method based on image processing | |
| CN102737230B (en) | Non-local mean filtering method based on direction field estimation | |
| CN109657579A (en) | A kind of detection of fingerprint crackle and restorative procedure | |
| CN102073872A (en) | Image-based method for identifying shape of parasite egg | |
| CN110675442A (en) | Local stereo matching method and system combined with target identification technology | |
| CN109493377A (en) | A kind of Intelligent road curing system | |
| CN103971347A (en) | Method and device for treating shadow in video image | |
| CN109919027A (en) | A kind of Feature Extraction System of road vehicles | |
| CN103065137B (en) | A kind of license plate character recognition method | |
| CN104573703B (en) | Power transmission line method for quickly identifying with border strategy is distributed based on local derviation |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CB03 | Change of inventor or designer information | ||
| CB03 | Change of inventor or designer information |
Inventor after: She Xuan Inventor after: Hu Huizhu Inventor after: Xue Boyan Inventor after: Jiu Lijun Inventor after: Shu Xiaowu Inventor before: Hu Huizhu Inventor before: Xue Boyan Inventor before: Jiu Lijun Inventor before: She Xuan Inventor before: Shu Xiaowu |
|
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20170510 Termination date: 20201224 |