EP0576636A1 - Method and device for measuring the degree of bending in a glass sheet - Google Patents
Method and device for measuring the degree of bending in a glass sheetInfo
- Publication number
- EP0576636A1 EP0576636A1 EP19920922188 EP92922188A EP0576636A1 EP 0576636 A1 EP0576636 A1 EP 0576636A1 EP 19920922188 EP19920922188 EP 19920922188 EP 92922188 A EP92922188 A EP 92922188A EP 0576636 A1 EP0576636 A1 EP 0576636A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- measuring
- optical
- ray
- glass sheet
- bending
- 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- Withdrawn
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)
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 |
---|---|
EP0576636A1 true EP0576636A1 (en) | 1994-01-05 |
Family
ID=8533336
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP19920922188 Withdrawn EP0576636A1 (en) | 1991-10-22 | 1992-10-20 | Method and device for measuring the degree of bending in a glass sheet |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP0576636A1 (ja) |
JP (1) | JPH06507722A (ja) |
FI (1) | FI89583C (ja) |
WO (1) | WO1993008447A1 (ja) |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FI98757C (fi) * | 1995-05-31 | 1997-08-11 | Tamglass Eng Oy | Menetelmä taivutetun lasilevyn taipumisasteen mittaamiseksi |
GB2326470B (en) * | 1997-06-10 | 1999-06-09 | British Aerospace | Improvements in structural deflection measurement |
FI117354B (fi) * | 2003-06-02 | 2006-09-15 | Tamglass Ltd Oy | Menetelmä reunamuotilla taivutettavan lasilevyn taivutuspussikkuuden mittaamiseksi |
FI118273B (fi) * | 2004-07-14 | 2007-09-14 | Tamglass Ltd Oy | Menetelmä lasilevyn taivutuspussikkuuden mittaamiseksi |
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 |
CN109506597B (zh) * | 2018-12-04 | 2021-03-23 | 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 |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3342675A1 (de) * | 1983-11-25 | 1985-06-05 | Fa. Carl Zeiss, 7920 Heidenheim | Verfahren und vorrichtung zur beruehrungslosen vermessung von objekten |
GB2205640A (en) * | 1987-05-11 | 1988-12-14 | Janusz Andrew Veltze | Non-contact measurement of distance to and between surfaces of an object |
-
1991
- 1991-10-22 FI FI914959A patent/FI89583C/fi not_active IP Right Cessation
-
1992
- 1992-10-20 WO PCT/FI1992/000281 patent/WO1993008447A1/en not_active Application Discontinuation
- 1992-10-20 EP EP19920922188 patent/EP0576636A1/en not_active Withdrawn
- 1992-10-20 JP JP5507474A patent/JPH06507722A/ja active Pending
Non-Patent Citations (1)
Title |
---|
See references of WO9308447A1 * |
Also Published As
Publication number | Publication date |
---|---|
JPH06507722A (ja) | 1994-09-01 |
FI914959A (fi) | 1993-04-23 |
WO1993008447A1 (en) | 1993-04-29 |
FI89583B (fi) | 1993-07-15 |
FI89583C (fi) | 1994-07-06 |
FI914959A0 (fi) | 1991-10-22 |
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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 |
|
17P | Request for examination filed |
Effective date: 19931028 |
|
AK | Designated contracting states |
Kind code of ref document: A1 Designated state(s): CH DE FR GB IT |
|
17Q | First examination report despatched |
Effective date: 19950126 |
|
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: 19950607 |
|
RBV | Designated contracting states (corrected) |
Designated state(s): CH DE FR GB IT LI |