WO1999013321A1 - Optisches prüfverfahren, seine anwendung und dafür bestimmte beleuchtungsvorrichtung - Google Patents
Optisches prüfverfahren, seine anwendung und dafür bestimmte beleuchtungsvorrichtung Download PDFInfo
- Publication number
- WO1999013321A1 WO1999013321A1 PCT/EP1998/005608 EP9805608W WO9913321A1 WO 1999013321 A1 WO1999013321 A1 WO 1999013321A1 EP 9805608 W EP9805608 W EP 9805608W WO 9913321 A1 WO9913321 A1 WO 9913321A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- optical axis
- plastic card
- plane
- illuminated
- converging
- Prior art date
Links
- 230000003287 optical effect Effects 0.000 title claims abstract description 14
- 238000012956 testing procedure Methods 0.000 title 1
- 238000012360 testing method Methods 0.000 claims abstract description 27
- 238000000034 method Methods 0.000 claims description 15
- 230000005855 radiation Effects 0.000 claims description 9
- 238000001514 detection method Methods 0.000 claims description 4
- 238000005286 illumination Methods 0.000 claims description 4
- 239000011521 glass Substances 0.000 claims 1
- 239000008267 milk Substances 0.000 claims 1
- 210000004080 milk Anatomy 0.000 claims 1
- 235000013336 milk Nutrition 0.000 claims 1
- 238000011144 upstream manufacturing Methods 0.000 claims 1
- 238000002310 reflectometry Methods 0.000 abstract description 2
- 230000007547 defect Effects 0.000 description 3
- 238000010998 test method Methods 0.000 description 2
- 238000009792 diffusion process Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000005338 frosted glass Substances 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
Classifications
-
- G—PHYSICS
- G07—CHECKING-DEVICES
- G07F—COIN-FREED OR LIKE APPARATUS
- G07F7/00—Mechanisms actuated by objects other than coins to free or to actuate vending, hiring, coin or paper currency dispensing or refunding apparatus
- G07F7/08—Mechanisms actuated by objects other than coins to free or to actuate vending, hiring, coin or paper currency dispensing or refunding apparatus by coded identity card or credit card or other personal identification means
- G07F7/086—Mechanisms actuated by objects other than coins to free or to actuate vending, hiring, coin or paper currency dispensing or refunding apparatus by coded identity card or credit card or other personal identification means by passive credit-cards adapted therefor, e.g. constructive particularities to avoid counterfeiting, e.g. by inclusion of a physical or chemical security-layer
-
- 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
-
- G—PHYSICS
- G07—CHECKING-DEVICES
- G07D—HANDLING OF COINS OR VALUABLE PAPERS, e.g. TESTING, SORTING BY DENOMINATIONS, COUNTING, DISPENSING, CHANGING OR DEPOSITING
- G07D7/00—Testing specially adapted to determine the identity or genuineness of valuable papers or for segregating those which are unacceptable, e.g. banknotes that are alien to a currency
- G07D7/003—Testing specially adapted to determine the identity or genuineness of valuable papers or for segregating those which are unacceptable, e.g. banknotes that are alien to a currency using security elements
- G07D7/0032—Testing specially adapted to determine the identity or genuineness of valuable papers or for segregating those which are unacceptable, e.g. banknotes that are alien to a currency using security elements using holograms
-
- G—PHYSICS
- G07—CHECKING-DEVICES
- G07D—HANDLING OF COINS OR VALUABLE PAPERS, e.g. TESTING, SORTING BY DENOMINATIONS, COUNTING, DISPENSING, CHANGING OR DEPOSITING
- G07D7/00—Testing specially adapted to determine the identity or genuineness of valuable papers or for segregating those which are unacceptable, e.g. banknotes that are alien to a currency
- G07D7/06—Testing specially adapted to determine the identity or genuineness of valuable papers or for segregating those which are unacceptable, e.g. banknotes that are alien to a currency using wave or particle radiation
- G07D7/12—Visible light, infrared or ultraviolet radiation
Definitions
- the invention relates to a method for testing plastic cards with the features mentioned in the preamble of claim 1.
- the invention is also applicable to other flat objects in which a surface defect detection is to be carried out.
- the cards in question often consist of several laminated together Layers, of which at least one is usually printed. A desired alignment and quality of the printed image is of course part of the surface inspection. Therefore, the cards are so illuminated with diffuse light during the test that the video camera captures an image reflected from the surface of the test object.
- an optical test method is largely insensitive to small deflections of the flat test specimens, it has the major disadvantage that scratches and grooves are only imaged with low contrast.
- the object of the invention is therefore to develop a method according to the preamble of claim 1 such that even relatively small surface defects can be identified and the test cannot be falsified by printed images.
- Claims 5 and 7 name important applications of the method.
- Claims 8 to 17 relate to an illumination device with which the method according to the invention can be carried out.
- the contours and thus the location of the targeted flat changes in the card surface can be recognized with certainty.
- Another important advantage is that the position of the card surface is no longer so critical for the reflection of the card surface, so that the reflection is still sufficiently good even if the card bends.
- the diffuse light component provides a scatter reflection component, which leads to a lower position sensitivity of the reflection. A loss of contrast that occurs in this respect is slight.
- the viewing options are consequently significantly increased according to the invention. Further refinements and advantages of the invention can be found in the subclaims and the description below.
- FIG. 1 schematically shows a first exemplary embodiment of a lighting device in combination with a video camera
- Fig. 2 shows schematically a second embodiment of an illumination device in combination with a video camera.
- test objects 2 are conveyed as test objects 2 along a support for test objects, here a channel 4, which runs perpendicular to the plane of the drawing.
- a video camera of which only the entrance aperture 6 is indicated, "sees" the test objects 2 at an angle of their optical axis 8 of, for example, 30 °.
- the lighting device comprises a light source 10 which approximately corresponds to a point light source and illuminates a diffuser 12.
- the diffuser 12 is, for example, a plate made of frosted glass or a plastic with a corresponding opacity.
- the diffuser is fixed on a circuit board 14 which is provided with a bore 16.
- the bore 16 forms an aperture for the light exit.
- a lens arrangement 18 is provided, consisting of two plano-convex lenses 20, 22, the flat sides of which face outwards and which are accommodated in a common housing 24.
- the lens arrangement bundles the light from the aperture bore 16 onto the respective test specimen.
- Fresnel lenses can also be used.
- the light contains a diffuse component, and it has been shown that with such illumination, surfaces with good contrast are also imaged differently on the test specimens, in which the reflectivity of the surfaces shows only relatively slight differences. This applies in particular to signature strips which - with the same color as the card - are somewhat rougher than the surface of the card itself. Such stripes appear dark in the illustration against a light background.
- An embossed hologram appears bright against a dark background, with a prism structure present in a hologram also providing image information.
- the size of the bore 16, which represents an aperture, and the diffusion effect of the plate 12 can be optimized with a few experiments in order to adjust the diffuse portion of the light.
- All elements are arranged in a common optical axis 8, which forms an angle different from 0 ° and 90 ° with the plane of the surface to be tested of a test specimen 2 when arranged in the beam path, preferably the angle is between 30 ° and 60 °.
- the test specimens can be arranged in a parallel beam path.
- the converging lens system 18 consists of two separately arranged converging lenses 20, 22, which can be the same type of lenses as described for FIG. 1, only spatially separated and with the intermediate arrangement of the carrier 4 for the test objects 2. The rest apply the explanations for the first exemplary embodiment according to FIG. 1 correspondingly for the second exemplary embodiment according to FIG. 2.
- a method according to the invention for the optical testing of plastic card surfaces in which at least a partial area of a surface of the test specimens 2 is illuminated and an image recorded with a video camera is compared with a stored pattern, provision is therefore made for the test specimens 2 to focus into the video camera reflected light, which is a directional incident radiation containing a diffuse portion, so that the surface is reflected.
- This provides a contrast image of the surface in the light-dark area depending on the surface condition and its wanted (like embossed images) or unwanted (like scratches, grooves etc.) roughness.
- the diffuse proportion of the light can be adjusted via the size of an aperture of the directionally incident radiation.
- the test specimens 2 can be illuminated by parallel rays of the directionally incident radiation. Alternatively, the test specimens 2 can be illuminated by converging rays of the directionally incident radiation.
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- General Health & Medical Sciences (AREA)
- Engineering & Computer Science (AREA)
- Computer Security & Cryptography (AREA)
- Toxicology (AREA)
- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Investigating Materials By The Use Of Optical Means Adapted For Particular Applications (AREA)
- Credit Cards Or The Like (AREA)
- Holo Graphy (AREA)
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US09/297,779 US6243162B1 (en) | 1997-09-09 | 1998-09-04 | System for optically examining plastic card surfaces |
EP98947516A EP0937241A1 (de) | 1997-09-09 | 1998-09-04 | Optisches prüfverfahren, seine anwendung und dafür bestimmte beleuchtungsvorrichtung |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19739328.4 | 1997-09-09 | ||
DE19739328A DE19739328C2 (de) | 1997-09-09 | 1997-09-09 | Verfahren und Vorrichtung zum Prüfen von Kunststoffkartenoberflächen |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1999013321A1 true WO1999013321A1 (de) | 1999-03-18 |
Family
ID=7841617
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP1998/005608 WO1999013321A1 (de) | 1997-09-09 | 1998-09-04 | Optisches prüfverfahren, seine anwendung und dafür bestimmte beleuchtungsvorrichtung |
Country Status (4)
Country | Link |
---|---|
US (1) | US6243162B1 (de) |
EP (1) | EP0937241A1 (de) |
DE (1) | DE19739328C2 (de) |
WO (1) | WO1999013321A1 (de) |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
ITTO20011043A1 (it) * | 2001-11-02 | 2003-05-02 | Tetra Laval Holdings E Finance | Materiale di confezionamento in foglio per il confezionamento di prodotti alimentari versabili. |
DE102004018856A1 (de) * | 2004-04-19 | 2005-11-03 | Giesecke & Devrient Gmbh | Vorrichtung zur Prüfung von Banknoten |
JP6776815B2 (ja) * | 2016-10-31 | 2020-10-28 | 大日本印刷株式会社 | 積層体の検査装置,方法およびプログラム |
US11835330B2 (en) * | 2021-02-03 | 2023-12-05 | Quality Vision International Inc. | Partial coherence mitigation in video measurement systems via illumination apodization |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5155558A (en) * | 1990-09-19 | 1992-10-13 | E. I. Du Pont De Nemours And Company | Method and apparatus for analyzing the appearance features of a surface |
EP0735361A2 (de) * | 1995-03-31 | 1996-10-02 | LINTEC Corporation | Vorrichtung zur Prüfung von Halbleitersubstraten |
US5640237A (en) * | 1995-08-29 | 1997-06-17 | Kla Instruments Corporation | Method and apparatus for detecting non-uniformities in reflective surafaces |
Family Cites Families (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4202626A (en) * | 1978-02-24 | 1980-05-13 | A Patent Partnership | Signature verification and authentication systems |
JPS5712352A (en) * | 1980-06-26 | 1982-01-22 | Hajime Sangyo Kk | Light diffusion device |
CH653161A5 (de) * | 1981-10-27 | 1985-12-13 | Landis & Gyr Ag | Dokument mit einem sicherheitsmerkmal und verfahren zur echtheitspruefung des dokumentes. |
DE3811905A1 (de) * | 1988-04-09 | 1989-10-19 | Ewald Rollnik | Anordnung zum erkennen und sichern von gegenstaenden sowie deren verwendung |
DE4036456C2 (de) * | 1990-01-18 | 1995-07-27 | Reinhold Gleixner | Verfahren zum Auslesen und/oder Identifizieren und/oder Prüfen von in Hologrammen beliebiger Art gespeicherten Informationen oder Objekten |
DE4117011A1 (de) * | 1991-05-24 | 1992-11-26 | Gao Ges Automation Org | Optischer sensor |
AT401829B (de) * | 1992-02-25 | 1996-12-27 | Oesterr Nationalbank | Verfahren zur zustands-, qualitäts- bzw. passerkontrolle von optischen sicherheitsmerkmalenauf wertpapieren, insbesondere banknoten, und vorrichtung zur durchführung des verfahrens |
DE19542995A1 (de) * | 1995-11-18 | 1997-05-22 | Matschke Wolfgang Dipl Ing | Datenträger mit dazugehörigem Auswertegerät und Verfahren zur Echtheitsprüfung des Datenträgers |
-
1997
- 1997-09-09 DE DE19739328A patent/DE19739328C2/de not_active Expired - Fee Related
-
1998
- 1998-09-04 US US09/297,779 patent/US6243162B1/en not_active Expired - Fee Related
- 1998-09-04 WO PCT/EP1998/005608 patent/WO1999013321A1/de not_active Application Discontinuation
- 1998-09-04 EP EP98947516A patent/EP0937241A1/de not_active Withdrawn
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5155558A (en) * | 1990-09-19 | 1992-10-13 | E. I. Du Pont De Nemours And Company | Method and apparatus for analyzing the appearance features of a surface |
EP0735361A2 (de) * | 1995-03-31 | 1996-10-02 | LINTEC Corporation | Vorrichtung zur Prüfung von Halbleitersubstraten |
US5640237A (en) * | 1995-08-29 | 1997-06-17 | Kla Instruments Corporation | Method and apparatus for detecting non-uniformities in reflective surafaces |
Also Published As
Publication number | Publication date |
---|---|
DE19739328C2 (de) | 1999-07-01 |
US6243162B1 (en) | 2001-06-05 |
EP0937241A1 (de) | 1999-08-25 |
DE19739328A1 (de) | 1999-03-25 |
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