EP0234105A1 - Mold identification - Google Patents

Mold identification Download PDF

Info

Publication number
EP0234105A1
EP0234105A1 EP86309371A EP86309371A EP0234105A1 EP 0234105 A1 EP0234105 A1 EP 0234105A1 EP 86309371 A EP86309371 A EP 86309371A EP 86309371 A EP86309371 A EP 86309371A EP 0234105 A1 EP0234105 A1 EP 0234105A1
Authority
EP
European Patent Office
Prior art keywords
light
vessel
code
field optics
light beam
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.)
Withdrawn
Application number
EP86309371A
Other languages
German (de)
English (en)
French (fr)
Inventor
Reade Williams
Paul Frederick Scott
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Emhart Industries Inc
Original Assignee
Emhart Industries Inc
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.)
Filing date
Publication date
Application filed by Emhart Industries Inc filed Critical Emhart Industries Inc
Publication of EP0234105A1 publication Critical patent/EP0234105A1/en
Withdrawn legal-status Critical Current

Links

Images

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
    • B07C—POSTAL SORTING; SORTING INDIVIDUAL ARTICLES, OR BULK MATERIAL FIT TO BE SORTED PIECE-MEAL, e.g. BY PICKING
    • B07C5/00—Sorting according to a characteristic or feature of the articles or material being sorted, e.g. by control effected by devices which detect or measure such characteristic or feature; Sorting by manually actuated devices, e.g. switches
    • B07C5/34—Sorting according to other particular properties
    • B07C5/3412—Sorting according to other particular properties according to a code applied to the object which indicates a property of the object, e.g. quality class, contents or incorrect indication

Definitions

  • the present invention relates to the identification of a mold with a glass container or like molded article, and more particularly to the design of reliable inspection apparatus, suited to detecting "dot codes”.
  • any malformations of the mold are transferred onto the article. It is necessary in such applications to identify the mold in which a specific defective article has been produced and sort out all articles made in this mold. This need has been particularly acute in the high speed production of glass containers, in which the molds are subjected to destructive thermal and mechanical influences. The generally accepted approach to this problem has been to furnish each mold with a marking, to be transferred onto all articles molded thereby.
  • mold identification code markings have been adopted, among the most popular of which is the dot-code; the present invention is especially applicable to the accurate detection of this type of code.
  • Typical of the prior approaches to mold number reading is the system of commonly assigned U.S. Patent No. 4,201,338.
  • a light source illuminates an area of the bottle's heel large enough to account for variations of bottle shape, relative placement of the photodetector, and other geometric factors.
  • Light which has been reflected from a dot-­code marking on the bottle is focused into the photodetector using a imaging-type optical system, and processed to extract the mold identification information.
  • Such systems do not clearly discriminate between background light and the light produced by the code marking, and require elaborate filtering to minimize this problem. More significantly, such systems have a quite limited depth of field, and hence are very sensitive to variations in bottle motion and other disturbances.
  • Another object is to provide a durable system which is easily adapted to a variety of operating environments.
  • a further object is to achieve a high degree of accuracy in the face of possible sources of "noise" in the output signals of such apparatus. These devices should enjoy increased immunity to background light and other spurious signal sources.
  • the mold identification apparatus and method of the invention in which the pattern of protruding mold code marks in a predetermined sector of a molded vessel is detected using a field optics assembly.
  • the article sector containing an array of protruding mold code marks is illuminated with a substantially collimated light beam of limited cross section. This light beam creates a well defined area of illumination of high luminance in the mold code sector, which illumination is selectively reflected.
  • the light is reflected away from the field optics assembly, while a mold code mark if present reflects a detectable portion of the light to the field optics assembly.
  • a detectable light input to the field optics assembly provides a reliable indication that a code mark is present.
  • the mold code marks are essentially hemispherical "dot codes”.
  • the area of illumination is a narrow rectangle of substantially greater vertical dimension than the code mark diameter, but somewhat narrower than such diameter.
  • the illumination will at any given time be distinctly associated with at most a single code mark, as the direction of scanning is transverse to the long axis of the illuminated area. Due to the high luminance of such illumination, a clearly detectable signal will arise in the presence of a code mark.
  • This assembly captures light within a "zone of acceptance", which in the preferred embodiment is conical.
  • this assembly includes an objective lens which defines the zone of acceptance, and a field lens which focuses light onto a photodetector.
  • the photodetector provides a light energy signal representative of the amount of light collected by the field optics assembly. The variations over time of the photodetector output signal while scanning the mold code sector provides a reliable indication of the code mark pattern.
  • the light source provides a light energy output modulated at a high frequency, and the photodetector output is demodulated to extract the signal at the modulation frequency.
  • This heterodyned signal technique reduces the output signal noise due to background light and other sources.
  • Figure 1 gives a fragmentary perspective view of a mold identification system 5, including bottle handling apparatus 90 and code reader assembly 20.
  • the bottle handling apparatus 90 is designed to stop a glass container 10 at the inspection station and rotate it to present to the code reader system 20 an array of code markings 15 near the container's heel.
  • the bottle handling devices 90 include underlying conveyor 91 as well as side belt 95 and spring loaded rollers 92.
  • rollers 93 press the container against side belt 95 for rotation through at least one container circumference.
  • the code reader assembly 20 includes a movable base 22 carrying a light source assembly 21 and photodetector assembly 75.
  • Base 22 moves in conjunction with rollers 92 toward container 10 to bring assemblies 21 and 75 into a suitable position for inspection, as further discussed below.
  • container 10 includes a circumferential array of code marks 15 located in a sector 13 just above the bottle's heel 11.
  • code marks 15 illustratively comprises an essentially hemispherical protrusion from the container's side wall.
  • the light source assembly 21 provides a small, well defined illuminated area 45.
  • the illuminated area 45 takes the form of a narrow rectangle with its long sides of length L essentially parallel to the axis of symmetry of container 10 (i.e., vertical axis), such illuminated area extending well above and below the height of code marks 15.
  • the width W of illuminated zone 40 is advantageously somewhat narrower than the diameter of code markings 15.
  • the light source 25 advantageously consists of a laser diode.
  • light source 25 consisted of a Mitsubishi ML4102 or ML4402 laser diode, operating in fundamental transverse mode, with a limited astigmatism of around 4 micrometers (ML4102 and ML4402 are tradenames of Mitsubishi Electric Corporation).
  • This laser diode provides essentially a point source of near-infrared light with fan-out characteristics which depend on orientation relative to the junction diode.
  • Light emitted from laser diode 25 passes through plano-­cylindrical lenses 30 and 35, which are perpendicularly oriented (compare figures 2 and 3).
  • lens 30 is separated from the junction of laser diode 25 by one focal length.
  • Lenses 30 and 35 limit the divergence of light rays 41, 43 from the central axis 42 in the horizontal and vertical planes, respectively.
  • this lens system focuses the laser light to form a collinated beam 40 of high luminance and limited cross section.
  • lens 60 is a plano-convex spherical lens. Lens 60 converges the captured light to field lens 65, which in turn focuses the light onto photodetector 70.
  • photodetector 70 comprises a PIN photodiode, 508204200 series, of Hewlett Packard Corporation.
  • Figures 3 and 4 both taken along on axial plane of container 10, illustrate the difference in reflection of the incident light 40 depending on whether a code mark 15 is present or absent.
  • a code mark 15 With no code mark present, light will be reflected by the inclined container surface 13 generally downwardly within a zone of reflection 59 of angle ⁇ defined by boundaries 81a, 82a. Inasmuch as this zone of reflection 59 does not encompass the lens 60, none of this light will be captured by the field optics.
  • a code marking 15 if a code marking 15 is present, however, a portion 50 of the light reflected by mark 15 will be directed to lens 50 and captured by the field optics assembly.
  • dot-­code identification in which code marking 15 is essentially hemispherical, it will reflect the incident light over a broad, continuous zone (a "line out" pattern).
  • the light source assembly 21 and photodetector assembly 75 are each aligned at an angle ⁇ relative to the center line 47. Smaller values of ⁇ provide higher depths of field, but require more compact packaging and mounting of the components of assemblies 21, 75 ( Figure 1). It is a principal advantage of the present invention that the use of field optics in the photodetector 75 provides depths of field which are far superior to prior art, "imaging" systems.
  • FIG. 5 schematically illustrates a preferred heterodyned, design of electronics 100 for driving laser diode 25 and for processing the output of photodiode 70.
  • Laser diode 25 is driven by a square wave, current controlled oscillator driver 170. Modulating the light source 25 at a high frequency distinguishes the reflected light detected by photodiode 70 from ambient light.
  • the photodiode output is amplified at 110, demodulated at 120, reamplified at 130, and passed through a modulation frequency filter 140 to extract the radiometric signal representing the light reflected by a code marking 15. This is compared with a preset threshold by comparator 150 to determine whether a significant signal is present, indicating a code mark 15.
  • the comparator output is received by processor 160 to derive the identification code information.
  • Electronics 100 produces a series of signal peaks representing the individual marks 15 of the dot-code pattern, and interprets these using a suitable decoding algorithm.
  • the light source optics 21 may include an optical filter which is spectrally matched to the laser diode 25. This technique takes advantage of the fact that laser diode 25 emits light with a very narrow bandwidth.

Landscapes

  • Length Measuring Devices By Optical Means (AREA)
EP86309371A 1985-12-30 1986-12-02 Mold identification Withdrawn EP0234105A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US81485385A 1985-12-30 1985-12-30
US814853 1985-12-30

Publications (1)

Publication Number Publication Date
EP0234105A1 true EP0234105A1 (en) 1987-09-02

Family

ID=25216166

Family Applications (1)

Application Number Title Priority Date Filing Date
EP86309371A Withdrawn EP0234105A1 (en) 1985-12-30 1986-12-02 Mold identification

Country Status (4)

Country Link
EP (1) EP0234105A1 (zh)
JP (1) JPS62159288A (zh)
CN (1) CN86108879A (zh)
AU (1) AU579755B2 (zh)

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2654955A1 (fr) * 1989-11-28 1991-05-31 Escribano Carmen Identification des chaussures de securite.
WO2005073699A1 (en) * 2004-01-26 2005-08-11 Owens-Brockway Glass Container, Inc. Optical inspection for container lean
GB2462409A (en) * 2008-07-11 2010-02-10 Ingenia Holdings Signature of moulded article
US7812935B2 (en) 2005-12-23 2010-10-12 Ingenia Holdings Limited Optical authentication
US7853792B2 (en) 2004-03-12 2010-12-14 Ingenia Holdings Limited Authenticity verification methods, products and apparatuses
US8078875B2 (en) 2005-07-27 2011-12-13 Ingenia Holdings Limited Verification of authenticity
US8103046B2 (en) 2004-08-13 2012-01-24 Ingenia Holdings Limited Authenticity verification of articles using a database
US8615475B2 (en) 2008-12-19 2013-12-24 Ingenia Holdings Limited Self-calibration
US8699088B2 (en) 2004-03-12 2014-04-15 Ingenia Holdings Limited Methods and apparatuses for creating authenticatable printed articles and subsequently verifying them
US8892556B2 (en) 2009-11-10 2014-11-18 Ingenia Holdings Limited Optimisation
US9818249B1 (en) 2002-09-04 2017-11-14 Copilot Ventures Fund Iii Llc Authentication method and system
US10012598B2 (en) 2015-07-17 2018-07-03 Emhart S.A. Multi-wavelength laser check detection tool
CN111842177A (zh) * 2020-06-12 2020-10-30 天津扬天科技有限公司 一种基于结构光视觉的耐火砖检测控制方法
CN113333312A (zh) * 2021-06-03 2021-09-03 东莞市华越自动化设备有限公司 一种dfn微型器件测试分选设备

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP5993576B2 (ja) * 2012-01-05 2016-09-14 あおい精機株式会社 検体情報検出装置及び検体情報検出方法

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2234613A1 (zh) * 1973-06-21 1975-01-17 Platmanufaktur Ab
US4201338A (en) * 1976-06-14 1980-05-06 Emhart Zurich S. A. Mold identification

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU510808B2 (en) * 1976-06-14 1980-07-17 Emhart Zurich S.A. Method of mould identification
JPS5323652A (en) * 1976-08-17 1978-03-04 Toyo Glass Co Ltd Method of discriminating type number of glass bottle
EP0105715A3 (en) * 1982-10-01 1986-08-20 Emhart Zürich S.A. Apparatus for reading a line marking fixed to a carrier

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2234613A1 (zh) * 1973-06-21 1975-01-17 Platmanufaktur Ab
US4201338A (en) * 1976-06-14 1980-05-06 Emhart Zurich S. A. Mold identification

Cited By (23)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2654955A1 (fr) * 1989-11-28 1991-05-31 Escribano Carmen Identification des chaussures de securite.
US9818249B1 (en) 2002-09-04 2017-11-14 Copilot Ventures Fund Iii Llc Authentication method and system
WO2005073699A1 (en) * 2004-01-26 2005-08-11 Owens-Brockway Glass Container, Inc. Optical inspection for container lean
US7010863B1 (en) 2004-01-26 2006-03-14 Owens-Brockway Glass Container Inc. Optical inspection apparatus and method for inspecting container lean
US8502668B2 (en) 2004-03-12 2013-08-06 Ingenia Holdings Limited System and method for article authentication using blanket illumination
US8896885B2 (en) 2004-03-12 2014-11-25 Ingenia Holdings Limited Creating authenticatable printed articles and subsequently verifying them based on scattered light caused by surface structure
US9019567B2 (en) 2004-03-12 2015-04-28 Ingenia Holdings Limited Methods and apparatuses for creating authenticatable printed articles and subsequently verifying them
US7853792B2 (en) 2004-03-12 2010-12-14 Ingenia Holdings Limited Authenticity verification methods, products and apparatuses
US8421625B2 (en) 2004-03-12 2013-04-16 Ingenia Holdings Limited System and method for article authentication using thumbnail signatures
US8766800B2 (en) 2004-03-12 2014-07-01 Ingenia Holdings Limited Authenticity verification methods, products, and apparatuses
US8757493B2 (en) 2004-03-12 2014-06-24 Ingenia Holdings Limited System and method for article authentication using encoded signatures
US8749386B2 (en) 2004-03-12 2014-06-10 Ingenia Holdings Limited System and method for article authentication using signatures
US8699088B2 (en) 2004-03-12 2014-04-15 Ingenia Holdings Limited Methods and apparatuses for creating authenticatable printed articles and subsequently verifying them
US8103046B2 (en) 2004-08-13 2012-01-24 Ingenia Holdings Limited Authenticity verification of articles using a database
US8078875B2 (en) 2005-07-27 2011-12-13 Ingenia Holdings Limited Verification of authenticity
US7812935B2 (en) 2005-12-23 2010-10-12 Ingenia Holdings Limited Optical authentication
US8497983B2 (en) 2005-12-23 2013-07-30 Ingenia Holdings Limited Optical authentication
GB2462409A (en) * 2008-07-11 2010-02-10 Ingenia Holdings Signature of moulded article
US8615475B2 (en) 2008-12-19 2013-12-24 Ingenia Holdings Limited Self-calibration
US8892556B2 (en) 2009-11-10 2014-11-18 Ingenia Holdings Limited Optimisation
US10012598B2 (en) 2015-07-17 2018-07-03 Emhart S.A. Multi-wavelength laser check detection tool
CN111842177A (zh) * 2020-06-12 2020-10-30 天津扬天科技有限公司 一种基于结构光视觉的耐火砖检测控制方法
CN113333312A (zh) * 2021-06-03 2021-09-03 东莞市华越自动化设备有限公司 一种dfn微型器件测试分选设备

Also Published As

Publication number Publication date
CN86108879A (zh) 1987-08-26
AU6610686A (en) 1987-07-02
JPS62159288A (ja) 1987-07-15
AU579755B2 (en) 1988-12-08

Similar Documents

Publication Publication Date Title
EP0234105A1 (en) Mold identification
US5028769A (en) Device for reading a mold code on a glass bottle
US4713536A (en) Molded code mark reader with elongated read beam
US5610391A (en) Optical inspection of container finish dimensional parameters
US4727419A (en) Method and apparatus for detecting tire information mark
EP0710382B1 (en) Apparatus for non-contact reading of a relief pattern
US4700078A (en) Method and apparatus for detecting tire information mark
US4644151A (en) Identification of a molded container with its mold of origin
US4230266A (en) Method and apparatus of cavity identification of mold of origin of a glass container
US5515447A (en) Method and apparatus for locating an acquisition target in two-dimensional images by detecting symmetry in two different directions
US4783167A (en) Finger imaging apparatus using curved platen
US4816668A (en) Mold number reader with field optics photodetector
US3916160A (en) Coded label for automatic reading systems
US5461228A (en) Optical inspection of container dimensional parameters using a telecentric lens
EP1164536A2 (en) An apparatus for reading an optical code
CA2330793C (en) Container sealing surface area inspection
CN100565194C (zh) 用于容器倾斜的光学检测
EP0676633A1 (en) Container sealing surface inspection
EP0256804B1 (en) Code reader
EP0284347A2 (en) A device for inspecting the degree of vacuum in a sealed vessel
JPH03194673A (ja) 記号読取装置
JP2719287B2 (ja) 凹凸コード判読装置
EP0345368A1 (en) Finger imaging apparatus
JPH1083471A (ja) コイン識別装置
JPH06266871A (ja) ピクセルコードのマーキング方法

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): DE FR GB IT

17P Request for examination filed

Effective date: 19880202

17Q First examination report despatched

Effective date: 19890316

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN

18D Application deemed to be withdrawn

Effective date: 19890727

RIN1 Information on inventor provided before grant (corrected)

Inventor name: SCOTT, PAUL FREDERICK

Inventor name: WILLIAMS, READE