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WO1993008447A1 - Procede et dispositif de mesure du degre de cintrage d'une plaque de verre - Google Patents

Procede et dispositif de mesure du degre de cintrage d'une plaque de verre Download PDF

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Publication number
WO1993008447A1
WO1993008447A1 PCT/FI1992/000281 FI9200281W WO9308447A1 WO 1993008447 A1 WO1993008447 A1 WO 1993008447A1 FI 9200281 W FI9200281 W FI 9200281W WO 9308447 A1 WO9308447 A1 WO 9308447A1
Authority
WO
WIPO (PCT)
Prior art keywords
measuring
optical
ray
glass sheet
bending
Prior art date
Application number
PCT/FI1992/000281
Other languages
English (en)
Inventor
Ville HÄYRINEN
Original Assignee
Tamglass Engineering Oy
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 Tamglass Engineering Oy filed Critical Tamglass Engineering Oy
Priority to JP5507474A priority Critical patent/JPH06507722A/ja
Publication of WO1993008447A1 publication Critical patent/WO1993008447A1/fr

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B11/00—Measuring arrangements characterised by the use of optical techniques
    • G01B11/24—Measuring arrangements characterised by the use of optical techniques for measuring contours or curvatures
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B11/00—Measuring arrangements characterised by the use of optical techniques
    • G01B11/16—Measuring arrangements characterised by the use of optical techniques for measuring the deformation in a solid, e.g. optical strain gauge
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B11/00—Measuring arrangements characterised by the use of optical techniques
    • G01B11/26—Measuring arrangements characterised by the use of optical techniques for measuring angles or tapers; for testing the alignment of axes

Definitions

  • the present invention relates to a method for measuring the degree of bending in a glass sheet by using an optical measuring unit for directing to the surface of a glass sheet on the one hand an illuminating ray and on the other hand a measuring ray crossing the illuminating ray.
  • the invention relates also to a device for measuring the degree of bending in a glass sheet, said device including an optical measuring unit provided with first optical elements for emitting an illuminating ray and second optical elements for receiving a measuring ray crossing the illuminating ray and for focusing it on a light detector.
  • An object of the invention is to provide an improved method and device, which are based on a more simple and inexpensive design construction and which can thus be preferably used both for measuring the deflection and for control measuring after bending and possible tempering.
  • the object of the invention is achieved on the basis of the characterizing features set forth in the annexed claims.
  • fig. 1 shows the general design of a measuring device of the invention schematically in a side view
  • fig. 2 shows schematically the construction of an optical measuring head included in the device
  • fig. 3 shows a cross-section of optical elements for emitting an illuminating ray 4 (e.g. a laser beam);
  • an illuminating ray 4 e.g. a laser beam
  • fig. 4 shows a cross-section of optical elements for receiving a measuring ray 5
  • fig. 5 shows in a larger scale the use of a delimiter 16 provided with a rectangular slot 17 in front of a photodiode 15.
  • the device consists of three main components, which include an optical measuring unit 1, a measuring-unit manipulation mechanism 2, and operation controlling electronic measuring and control elements 3.
  • the degree of bending or deflection of a glass sheet surface 20 is monitored by measuring its distance by means of two mutually crossing optical rays 4 and 5.
  • One of the rays is an illuminating ray 4, which is generated by means of laser and optics 6 and which produces on the glass surface a small illuminated spot having a diameter of 300 - 500 ⁇ .
  • Criss-crossing with said illuminating ray 4 at a point 21 and at a fixed pre-selected angle is a measuring ray 5 for collecting the light reflected from the target on a detector, which in the present case comprises a photodiode 15 contained in an optical tube 7 (see fig. 4).
  • Optics 7 and detector 15 together produce or define said measuring ray 5.
  • a detector 15 associated with optics 7 is capable of detecting a light source (point 21) only and solely if the light source (point 21) is included in said volume. It is obvious that a photodiode is not the only plausible detector and that one and the same device can inlude a plurality of detectors.
  • the measuring ray 5 is restricted by means of a rectangular slot 17 included in a delimiter
  • a rectangular form is capable of providing a good measuring accuracy while avoiding alignment problems which would result from focusing two small rays on a single spot.
  • the delimitation of a ray can be effected by a variety of methods and the form need not be rectangular but it can be generally elongated.
  • the illuminating ray can be effected by a variety of methods and the form need not be rectangular but it can be generally elongated.
  • the delimitation relaxes the manufacturing tolerances and application of the device but is not essential in view of the operation and accuracy of the device.
  • Measuring the distance of target surface 20 is based on the fact that the reflection of light from illuminating ray 4 to measuring ray 5 is only possible if the object to be measured is located precisely at the crossing point 21 of these two rays 4, 5.
  • the question is about an optical triangulation method, wherein crossing point 21 of the rays and said optical elements 6 and 7 provide a measuring triangle.
  • lenses 11 and 12 included in laser optics 6 are fastened to a tubular member 13, which is also provided with a laser 10.
  • a delimiter 16 a lens 18 and a filter 19 included in photodiode optics 7 are fastened to a tube 14, which is also provided with a photodiode 15 behind said delimiter 16.
  • both tubular optical elements 6 and 7 are secured to a member 9 so as to provide an optical measuring head 1 that can be manipulated as a single unit.
  • the distance between the outset points of measuring -rays 4 and 5 can be e.g. 30 cm. That distance, however, as well as the angle between rays 4 and 5, can be preset at a certain fixed value.
  • a method of the invention is based on the fact that the position of optical measuring head 1 transmits data about the bending degree of a glass sheet and a manipulating mechanism 2 or the operator of a measuring device seeks to maintain said optical measuring head 1 at a constant distance or nearly at a constant distance from glass sheet 20 by means of said optical triangul tio .
  • the photodiode 15 is linked through the intermediary of an amplification electronic component 8 with measuring and control elements 3 for controlling said mechanism 2, capable of manipulating the optical measuring unit up and down in vertical direction.
  • said measuring and control elements 3 serve to control manipulating mechanism 2 and, on the other hand, to monitor an electric signal coming from photodiode 15.
  • One possible solution for measuring and control elements is a programmable logic, which includes analogical inputs and outputs and in which it is possible to program an access strategy required for searching said target 20.
  • the manipulating means 2 may comprise primarily direct- current or stepping-motor based linear motors. In principle, both are just as well suitable for the purpose but direct-current linear motors fitted with an attitude- or position-measuring potentiometer are more simple to control and more economical in terms of price.
  • the measuring and control elements 3 are in possession of data about the position or travelling distance of optical measuring unit 1 in relation to a preset value, which is selected e.g. in a manner that said crossing point 21 is located in alignment with the surface 20 of a glass sheet bent to a desired degree.
  • this data about the position or travelling distance can be transmitted from a sensor associated with manipulating means 2 or it can be obtained directly from control commands issued by control elements 3 (e.g. when using a stepping motor).
  • the degree of bending can hence be monitored constantly as the glass is-bending by lowering said optical measuring unit 1 so that the crossing point 21 of the rays follows the glass surface 20.
  • the measuring result is reported as a plus/minus deviation from a predetermined target value. In control measurements, it is sufficient to report whether the measuring result lies within an acceptable range.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Length Measuring Devices By Optical Means (AREA)

Abstract

Procédé et dispositif de mesure du degré de cintrage d'une plaque de verre. Une unité de mesure optique (1) émet un faisceau lumineux (4) et reçoit un faisceau de mesure (5). Les composantes optiques des faisceaux (4, 5) sont orientées de manière que lesdits faisceaux se croisent. Lorsque la surface (20) d'une plaque de verre se trouve au point exact de croisement des deux faisceaux, la lumière est réfléchie du faisceau lumineux au faisceau de mesure, ce dernier étant surveillé par des éléments électriques de mesure (3) servant également d'éléments de commande d'un mécanisme de man÷uvre (2) assurant le déplacement dans le sens vertical de ladite unité de mesure optique (1).
PCT/FI1992/000281 1991-10-22 1992-10-20 Procede et dispositif de mesure du degre de cintrage d'une plaque de verre WO1993008447A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP5507474A JPH06507722A (ja) 1991-10-22 1992-10-20 板ガラスの曲げ率を測定する方法及び装置

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FI914959A FI89583C (fi) 1991-10-22 1991-10-22 Foerfarande och anordning foer maetning av boejningsgraden hos en glasskiva
FI914959 1991-10-22

Publications (1)

Publication Number Publication Date
WO1993008447A1 true WO1993008447A1 (fr) 1993-04-29

Family

ID=8533336

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/FI1992/000281 WO1993008447A1 (fr) 1991-10-22 1992-10-20 Procede et dispositif de mesure du degre de cintrage d'une plaque de verre

Country Status (4)

Country Link
EP (1) EP0576636A1 (fr)
JP (1) JPH06507722A (fr)
FI (1) FI89583C (fr)
WO (1) WO1993008447A1 (fr)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0747664A2 (fr) * 1995-05-31 1996-12-11 Tamglass Engineering Oy Procédé de mesure du degré de cintrage d'une plaque de verre pliée
EP0884559A2 (fr) * 1997-06-10 1998-12-16 British Aerospace Public Limited Company Améliorations aux mesures de déflections de structures
WO2004106852A1 (fr) * 2003-06-02 2004-12-09 Tamglass Ltd. Oy Procede de mesure du ramollissage d'un panneau de verre a flechir sur un moule annulaire
WO2006005805A1 (fr) * 2004-07-14 2006-01-19 Tamglass Ltd. Oy Procede permettant de mesurer l'affaissement d'une plaque de verre
CN101685003B (zh) * 2008-09-25 2010-12-08 向熙科技股份有限公司 非接触式量测变形值的量测系统及其方法
CN109506597A (zh) * 2018-12-04 2019-03-22 四川金湾电子有限责任公司 一种半导体引线框架侧弯自动化检测方法及检测系统

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4660970A (en) * 1983-11-25 1987-04-28 Carl-Zeiss-Stiftung Method and apparatus for the contact-less measuring of objects
GB2205640A (en) * 1987-05-11 1988-12-14 Janusz Andrew Veltze Non-contact measurement of distance to and between surfaces of an object

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4660970A (en) * 1983-11-25 1987-04-28 Carl-Zeiss-Stiftung Method and apparatus for the contact-less measuring of objects
GB2205640A (en) * 1987-05-11 1988-12-14 Janusz Andrew Veltze Non-contact measurement of distance to and between surfaces of an object

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0747664A2 (fr) * 1995-05-31 1996-12-11 Tamglass Engineering Oy Procédé de mesure du degré de cintrage d'une plaque de verre pliée
EP0747664A3 (fr) * 1995-05-31 1997-07-30 Tamglass Eng Oy Procédé de mesure du degré de cintrage d'une plaque de verre pliée
EP0884559A2 (fr) * 1997-06-10 1998-12-16 British Aerospace Public Limited Company Améliorations aux mesures de déflections de structures
EP0884559A3 (fr) * 1997-06-10 2000-10-04 British Aerospace Public Limited Company Améliorations aux mesures de déflections de structures
WO2004106852A1 (fr) * 2003-06-02 2004-12-09 Tamglass Ltd. Oy Procede de mesure du ramollissage d'un panneau de verre a flechir sur un moule annulaire
WO2006005805A1 (fr) * 2004-07-14 2006-01-19 Tamglass Ltd. Oy Procede permettant de mesurer l'affaissement d'une plaque de verre
CN101685003B (zh) * 2008-09-25 2010-12-08 向熙科技股份有限公司 非接触式量测变形值的量测系统及其方法
CN109506597A (zh) * 2018-12-04 2019-03-22 四川金湾电子有限责任公司 一种半导体引线框架侧弯自动化检测方法及检测系统

Also Published As

Publication number Publication date
EP0576636A1 (fr) 1994-01-05
FI89583C (fi) 1994-07-06
JPH06507722A (ja) 1994-09-01
FI914959A0 (fi) 1991-10-22
FI914959L (fi) 1993-04-23
FI89583B (fi) 1993-07-15

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