WO2017056029A1 - Dispositif optique - Google Patents

Dispositif optique Download PDF

Info

Publication number
WO2017056029A1
WO2017056029A1 PCT/IB2016/055823 IB2016055823W WO2017056029A1 WO 2017056029 A1 WO2017056029 A1 WO 2017056029A1 IB 2016055823 W IB2016055823 W IB 2016055823W WO 2017056029 A1 WO2017056029 A1 WO 2017056029A1
Authority
WO
WIPO (PCT)
Prior art keywords
optical
light
tubular body
workpiece
central tubular
Prior art date
Application number
PCT/IB2016/055823
Other languages
English (en)
Inventor
Paolo Maioli
Original Assignee
Vici & C S.P.A.
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 Vici & C S.P.A. filed Critical Vici & C S.P.A.
Priority to EP16794733.2A priority Critical patent/EP3356764A1/fr
Publication of WO2017056029A1 publication Critical patent/WO2017056029A1/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
    • 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
    • G01N21/8806—Specially adapted optical and illumination features
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B21/00—Microscopes
    • G02B21/06—Means for illuminating specimens
    • G02B21/08—Condensers
    • G02B21/082—Condensers for incident illumination only
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B21/00—Microscopes
    • G02B21/36—Microscopes arranged for photographic purposes or projection purposes or digital imaging or video purposes including associated control and data processing arrangements
    • G02B21/362—Mechanical details, e.g. mountings for the camera or image sensor, housings
    • 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
    • G01N21/8806—Specially adapted optical and illumination features
    • G01N2021/8812—Diffuse illumination, e.g. "sky"
    • G01N2021/8816—Diffuse illumination, e.g. "sky" by using multiple sources, e.g. LEDs

Definitions

  • This invention relates to an optical device.
  • this invention relates to an optical device to be integrated in a machine for optical measurement.
  • the present invention relates to an optical device to be integrated in a machine for the optical measurement of workpieces which are mainly planar in extension.
  • optical (optoelectronic) measuring machines which comprise a workpiece supporting stage made of substantially transparent material and interposed between a light source and an image detector.
  • These machines typically comprise a fixed mount defining the (vitreous) supporting stage along which the optoelectronic measuring system is movable in the main X-Y directions.
  • Optical measuring machines which are equipped with a transparent measuring stage on which the workpiece to be measured is positioned, a fixed light source located under the measuring stage and facing upwards in order to illuminate the workpiece with a light beam, and a video capturing system equipped with a camera which is partly movable relative to the stage (along two main directions X-Y) in order to capture a plurality of frames which are then combined by means of specific software to produce a complete image of the measuring field and, therefore, of the workpiece.
  • the technical purpose of this invention is to provide an optical measuring machine and method which overcome the above mentioned drawbacks of the prior art.
  • the aim of this invention is to provide an optical measuring device which is able to optimise the lighting of the workpiece to be measured.
  • FIG. 1 is a schematic side elevation view, with some parts transparent and others in cross section, of a preferred embodiment of the optical measuring device made according to this invention
  • Figure 2 is a schematic perspective top view of the device of Figure 1 ,
  • FIG. 3 is a schematic cross section view through the line Ill-Ill of Figure 1 .
  • the numeral 1 denotes in its entirety an optical device according to this invention.
  • the optical device 1 is designed to be installed in a machine, not illustrated, for the optical measurement of workpieces.
  • These measuring machines are of the optoelectronic type, configured to measure mostly workpieces which are mainly planar or which, at least, do not vary significantly in shape along their thickness.
  • These machines also comprise a supporting frame, a supporting surface for the workpiece to be measured, extending preferably horizontal and made of substantially transparent material, a light source located below the supporting surface to illuminate the bottom of the workpiece and an optical device designed to allow the capturing of an optical image of the workpiece.
  • the machine also comprises, also not illustrated, a computerised unit for processing the image captured, as well as movement means configured to vary the relative position between the optical device and the supporting surface.
  • the optical device 1 comprises a tubular central body 2 having a partly cylindrical extension, with a respective central axis A1 .
  • the central tubular body 2 In a relative upper portion 2a, the central tubular body 2, hereinafter also referred to merely as the central body 2, has an inclined wall 3, in a plane incident at 45° with the central axis A1 .
  • a second cylindrical body 4 engages on the central body 2, having a respective central axis A2, at right angles to the above- mentioned central axis A1 of the central body 2.
  • the second cylindrical body 4 is connected to an optical video camera, schematically illustrated in Figures 1 and 2 with a cube 5.
  • the video camera 5 is designed for detecting images of a workpiece to be measured.
  • the device 1 Inside the central body 2 and the second cylindrical body 4, the device 1 comprises a plurality of optical lenses 6, illustrated only schematically in the accompanying drawings, and a mirror 7.
  • the mirror 7, shown in transparency also in Figure 2 is located on the above-mentioned inclined wall 3 and is configured to direct towards the second cylindrical body 4 and the video camera 5, diverting them by 45°, the images coming from the central body 2.
  • telecentric optical unit is used to mean an optical system which is able to convey images towards the video camera in a way which is substantially perpendicular to a relative sensor for capturing the images.
  • the axes A1 , A2 define, for the respective sections of the optical unit 8, the optical axis.
  • the optical axis passes through their centre of curvature and coincides with the rotational axis of symmetry.
  • the optical device 1 comprises a plurality of light sources 9 positioned inside the tubular central body 2 and interposed between lenses 6 of the optical unit 8. More specifically, in the preferred embodiment illustrated in Figures 1 and 2, the device 1 comprises four supporting elements 10, each carrying a respective light source 9, positioned alongside a cylindrical surface C inside the central body 2.
  • the supporting elements 10 have an outer wall cylindrical in shape in such a way as to be mounted closely adhering to the above-mentioned inner cylindrical surface.
  • the lighting sources 9 and, consequently, also the supporting elements 10 are positioned angularly equally distributed relative to the central axis A1 which, for the section of optical unit housed in the central body 2, defines a respective optical axis.
  • the images captured by the video camera 5 have a quadrangular shape and, therefore, advantageously, there are four light sources 9 and they are positioned outside the sides of a rectangle inscribed within a circumference which is concentric relative to the central tubular body 2, as shown by way of example in Figure 3.
  • the above-mentioned lighting sources 9 are of the LED (Light Emitting Diode) type.
  • the above-mentioned light sources 9 together form, for the optical device 1 , the means for illuminating the workpiece to be measured.
  • the central tubular body 2 has the above-mentioned inner cylindrical surface C made with a high light absorption for limiting the reflection of the light rays emitted by the light sources 9.
  • the inner cylindrical surface C is coated with suitable materials to absorb the visible light.
  • the light sources 9 are positioned, inside the optical unit 9, in a position such that the light beam F emitted from them strikes one or more optical lenses 6 of the unit 9.
  • the one or more lenses may be advantageously made for diffusing the light beam F emitted by the light sources 9 and achieve a substantially uniform illumination of the workpiece to be measured, not illustrated, but positioned below the light beam F with reference to Figures 1 and 2.
  • the one or more lenses 6 struck by the light beam F are also advantageously configured to rectify the rays of light which make up the beam F with, at the outlet from the optical unit 8, a limited inclination relative to the optical axis A1 .
  • the supporting elements 10 have, at the light sources 9, an "eyelid", not visible in the accompanying drawings, designed to screen the rays of light directed towards the centre of the central body 2 that is, towards the optical axis A1 .
  • the optical device 1 In use, the optical device 1 according to this invention allows optimum lighting of the workpieces, not illustrated, to be measured.
  • the light beam F produced by them which strikes the workpiece to be measured illuminates the latter at the top and eliminates the distortions in the image captured by the camera 5 caused by lateral lighting sources.
  • the beam F which strikes the workpiece to be measured is substantially parallel to the optical axis A1 , thereby contributing to the capturing of an image which corresponds particularly to the real shape of the workpiece.
  • the invention achieves the preset aims and brings major advantages.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Optics & Photonics (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Multimedia (AREA)
  • Health & Medical Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Biochemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Length Measuring Devices By Optical Means (AREA)
  • Glass Compositions (AREA)
  • Surgical Instruments (AREA)
  • Laser Surgery Devices (AREA)

Abstract

L'invention concerne un dispositif optique pour machines pour la mesure optique de pièces à usiner, comprenant un corps tubulaire central (2), une caméra vidéo (5) optique pour détecter des images d'une pièce à usiner à mesurer, une unité optique télécentrique (8) comprenant une pluralité de lentilles (6), au moins partiellement logée dans le corps tubulaire central (2) et conçue pour acheminer les images vers la caméra vidéo (2), des moyens d'éclairage configurés pour générer un faisceau lumineux (F) dirigé vers la pièce à usiner à mesurer.
PCT/IB2016/055823 2015-10-02 2016-09-29 Dispositif optique WO2017056029A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP16794733.2A EP3356764A1 (fr) 2015-10-02 2016-09-29 Dispositif optique

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT102015000057687 2015-10-02
ITUB2015A004085A ITUB20154085A1 (it) 2015-10-02 2015-10-02 Dispositivo ottico.

Publications (1)

Publication Number Publication Date
WO2017056029A1 true WO2017056029A1 (fr) 2017-04-06

Family

ID=55085790

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IB2016/055823 WO2017056029A1 (fr) 2015-10-02 2016-09-29 Dispositif optique

Country Status (3)

Country Link
EP (1) EP3356764A1 (fr)
IT (1) ITUB20154085A1 (fr)
WO (1) WO2017056029A1 (fr)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20040165759A1 (en) * 2003-02-26 2004-08-26 Leo Baldwin Coaxial narrow angle dark field lighting
US20120027307A1 (en) * 2010-07-29 2012-02-02 Keyence Corporation Image Measurement Device, Method For Image Measurement, And Computer Readable Medium Storing A Program For Image Measurement
US20120127468A1 (en) * 2010-11-18 2012-05-24 Quality Vision International, Inc. Through-the-lens illuminator for optical comparator
WO2013182960A1 (fr) * 2012-06-08 2013-12-12 Vici & C. - S.R.L. Machine et procédé de mesure optique

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20040165759A1 (en) * 2003-02-26 2004-08-26 Leo Baldwin Coaxial narrow angle dark field lighting
US20120027307A1 (en) * 2010-07-29 2012-02-02 Keyence Corporation Image Measurement Device, Method For Image Measurement, And Computer Readable Medium Storing A Program For Image Measurement
US20120127468A1 (en) * 2010-11-18 2012-05-24 Quality Vision International, Inc. Through-the-lens illuminator for optical comparator
WO2013182960A1 (fr) * 2012-06-08 2013-12-12 Vici & C. - S.R.L. Machine et procédé de mesure optique

Also Published As

Publication number Publication date
EP3356764A1 (fr) 2018-08-08
ITUB20154085A1 (it) 2017-04-02

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