WO2002067567A1 - VORRICHTUNG UND VERFAHREN ZUM ZEILENFÖRMIGEN BELEUCHTEN EINES OBJEKTES MITTELS LEDs UND EINES ELLIPTISCHEN SPIEGELS - Google Patents
VORRICHTUNG UND VERFAHREN ZUM ZEILENFÖRMIGEN BELEUCHTEN EINES OBJEKTES MITTELS LEDs UND EINES ELLIPTISCHEN SPIEGELS Download PDFInfo
- Publication number
- WO2002067567A1 WO2002067567A1 PCT/EP2002/001797 EP0201797W WO02067567A1 WO 2002067567 A1 WO2002067567 A1 WO 2002067567A1 EP 0201797 W EP0201797 W EP 0201797W WO 02067567 A1 WO02067567 A1 WO 02067567A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- mirror
- focal
- focal line
- radiation
- leds
- Prior art date
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
- H04N1/024—Details of scanning heads ; Means for illuminating the original
- H04N1/028—Details of scanning heads ; Means for illuminating the original for picture information pick-up
- H04N1/02815—Means for illuminating the original, not specific to a particular type of pick-up head
- H04N1/0282—Using a single or a few point light sources, e.g. a laser diode
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
- H04N1/024—Details of scanning heads ; Means for illuminating the original
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
- H04N1/024—Details of scanning heads ; Means for illuminating the original
- H04N1/028—Details of scanning heads ; Means for illuminating the original for picture information pick-up
- H04N1/02815—Means for illuminating the original, not specific to a particular type of pick-up head
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
- H04N1/024—Details of scanning heads ; Means for illuminating the original
- H04N1/028—Details of scanning heads ; Means for illuminating the original for picture information pick-up
- H04N1/02815—Means for illuminating the original, not specific to a particular type of pick-up head
- H04N1/0282—Using a single or a few point light sources, e.g. a laser diode
- H04N1/0284—Using a single or a few point light sources, e.g. a laser diode in combination with a light integrating, concentrating or diffusing cavity
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
- H04N1/024—Details of scanning heads ; Means for illuminating the original
- H04N1/028—Details of scanning heads ; Means for illuminating the original for picture information pick-up
- H04N1/02815—Means for illuminating the original, not specific to a particular type of pick-up head
- H04N1/02845—Means for illuminating the original, not specific to a particular type of pick-up head using an elongated light source, e.g. tubular lamp, LED array
- H04N1/0285—Means for illuminating the original, not specific to a particular type of pick-up head using an elongated light source, e.g. tubular lamp, LED array in combination with at least one reflector which is in fixed relation to the light source
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
- H04N1/024—Details of scanning heads ; Means for illuminating the original
- H04N1/028—Details of scanning heads ; Means for illuminating the original for picture information pick-up
- H04N1/02815—Means for illuminating the original, not specific to a particular type of pick-up head
- H04N1/02845—Means for illuminating the original, not specific to a particular type of pick-up head using an elongated light source, e.g. tubular lamp, LED array
- H04N1/02865—Means for illuminating the original, not specific to a particular type of pick-up head using an elongated light source, e.g. tubular lamp, LED array using an array of light sources or a combination of such arrays, e.g. an LED bar
Definitions
- the invention relates to a device for the cellular illumination of an object.
- the invention further relates to a method for the cellular illumination of an object and a scanning system.
- a typical application for a device for linearly illuminating an object is an image recording system in which a sensor, for example a camera, detects graphic elements of a template, these graphic elements are digitized and the image data are further processed.
- the quality of an image recording system depends directly on the amount of light that is available to the sensor during scanning to generate the corresponding signals. It is therefore desirable, especially in the area of fast line scanning systems, to provide a large amount of light, since this provides a high signal-to-noise ratio for the subsequent signal processing. Furthermore, it is necessary to use a light source with the lowest possible power loss, which has high time stability and temperature stability.
- LEDs Light-emitting diodes, so-called LEDs, have very good properties for use in image recording systems with regard to service life, time stability, temperature stability and efficiency of the light output.
- Known scanning systems that use LED lines focus the radiation using rod lenses or Fresnel lenses. Such systems are used for monochromatic light.
- an optical scanning system which works with a curved pivotable mirror.
- the radiation from a monochromatic LED is directed through the mirror as a light spot onto an object to be scanned.
- the received beam path of a light receiving diode is guided over the same mirror, so that the graphic elements illuminated in the light spot are scanned when the mirror is pivoted.
- US-A-5, 12, 205 describes a scanning system with a stationary mirror which is elliptical in cross section.
- An elongated fluorescent tube is arranged in the first focal line of the mirror, the document to be scanned in the second focal line.
- the radiation from the fluorescent tube is focused on the document in a cell-like manner by the mirror.
- an image reading device which uses an LED as the light source.
- This LED has an elliptical mirror, the LED being arranged in one focal point of the mirror and the other focal point of the mirror on the image to be read.
- a stationary mirror is used to concentrate the radiation.
- This mirror has two
- Focal lines Several LEDs are arranged along a focal line. The radiation detected by the mirror is focused in the second focal line.
- the device has a compact structure and further favorable properties with regard to the service life of the light source, time stability, temperature stability and light output.
- the beam path remains clear, as there are great degrees of freedom in the position of the two focal lines of the mirror.
- the mirror there are no wavelength-dependent chromatic aberrations, so that when using LEDs that emit white light, there are no color errors at the focus edges.
- the cylindrical section of the mirror has the shape of the inner circumferential surface of an elliptical cylinder.
- the elliptically shaped mirror has the property of completely focusing radiation that is emitted from the first focal point of the ellipse into the second focal point. No chromatic errors occur due to the geometric reflection of the mirror surface. Such a mirror system is therefore particularly well suited for polychromatic light.
- a focal line is created instead of a focal point, which enables optimal cellular illumination of an object. This cellular illumination is particularly advantageous when an object has to be scanned digitally.
- a method is specified using the device mentioned. Furthermore, a system for scanning an object using a sensor system, for example a camera, is specified.
- FIG. 1 shows an arrangement of an LED on a circuit board and the radiation characteristic of the LED
- FIG. 2 shows the principle of radiation reflection on an elliptical mirror
- Figure 3 shows an arrangement with several elliptical
- FIG. 4 shows an embodiment with LED rows arranged on both sides on a printed circuit board
- FIG. 5 shows a lighting arrangement with an LED
- FIG. 6 shows a symmetrical arrangement of two LED rows and two elliptical mirrors
- Figure 8 is a perspective view of a shaped sheet serving as an elliptical cylindrical mirror.
- FIG. 1 shows the arrangement of an LED 10 on a printed circuit board 12.
- This printed circuit board 12 carries conductor tracks and optionally also electronic components for controlling the LED 10.
- This LED 10 emits polychromatic light, in particular white light.
- the generation of polychromatic light is possible through the use of fluorescent conversion substances in the semiconductor structure of the LED.
- the problem with such polychromatic LEDs 10 is that the radiated power density is relatively low.
- FIG. 1 shows that the radiation, indicated by arrows 14, takes place in the half-space in the manner of a spherical light distribution curve 16.
- Figure 2 shows the principle used in the invention. If a polychromatic LED 10 is arranged in an elliptical mirror 18 with the two focal points 20, 22 in the focal point 20 net, which emits light according to the light distribution curve 16, this light is reflected on the elliptical mirror 18 and focused in the second focal point 22. In principle, this applies to all rays. However, this is only used for rays that are emitted into the half-space in the direction of the light distribution curve 16; The beam 24 is also theoretically focused in the focus 22. In general, it is sufficient to use only a section of the ellipse 18 as a mirror in order to achieve a sufficient concentration of the radiation emitted in the half-space.
- a skilful choice of the ellipse parameters enables a compact geometric arrangement with many degrees of freedom to be achieved. Due to the geometric reflection on the elliptical surface of the mirror 18, no chromatic aberration occurs; rather, the rays of different wavelengths are focused at the focal point 22 without color edges.
- a section of an inner circumferential surface of an elliptical cylinder is used as the mirror.
- the focal points 20, 22 are then points on focal lines 20, 22. If a plurality of LEDs 10 are arranged in the focal line 20, a line of light is produced in the focal line 22 which is particularly well suited for the optoelectronic scanning of originals.
- FIG. 3 now shows an extension of the principle shown in FIG. 2 by means of parallel focusing with the aid of several elliptical mirrors 26, 28, 30, with mirror sections again being sufficient to reflect the radiation.
- One or more LEDs in the manner of LED 10 are arranged in the respective first focal points or focal lines 32, 34, 36.
- the various mirrors 26, 28, 30 have a common second focal point 38 and a common focal line 38.
- This focal point 38 and the focal line 38 is again first focal point 38 or Br 'ennline 38 of another elliptical collecting mirror 40 having a second focal point 42 and fuels line 42 when the collecting mirror 40 is designed as an elliptical cylinder mirror.
- the radiation emanating from the first focal lines 32, 34, 36 is bundled in the second focal line 38 common to all mirrors 26, 28, 30.
- the radiation emanating from this focal line 38, which corresponds to the first focal line 38 of the mirror 40, is bundled in the second focal line 42 of the mirror 40.
- a rotating element for example a section of an ellipsoid
- a rotating element for example a section of an ellipsoid
- Such a mirror then has no focal lines but focal points.
- the radiation emanating from the focal points 32, 34, 36 is then focused on the ellipsoid mirror surfaces of the mirrors 26, 28, 30 into the focal point 38, which corresponds to the first focal point of the ellipsoid collecting mirror 40.
- the radiation emanating from the focal point 38 is then bundled into the focal point 42, where a light spot of high radiation density is created.
- FIG. 4 shows an arrangement of a device for illuminating an object 0 in the form of cells, the same parts being designated the same.
- LEDs 10 are arranged on the circuit board 12 in a row on both sides of the circuit board 12. These LEDs 10 are arranged along the first focal line of two elliptical cylindrical mirrors 46, 48. These mirrors 46, 48 focus the radiation into its second one Focal line 50, which coincide locally and illuminate object 0.
- the device shown has a compact structure, since the emission characteristic of the LED, which emits radiation only in one half-space, is linked to the favorable imaging properties of the elliptical mirrors 46, 48. In this way it is possible to record the entire emitted radiation with the aid of relatively small mirror elements. By choosing the ellipse parameters, a largely compact structure can be achieved, so that radiation can be focused on the object 0 even over a relatively large distance.
- FIG. 5 shows a structure with only one row of LEDs 10 on the printed circuit board 12.
- the elliptical mirror 52 is connected directly to the printed circuit board 12, which results in a structurally simple structure.
- the object 0 to be illuminated is tilted with respect to the vertical in which the printed circuit board 12 is located. From direction 54, the cell-illuminated object 0 is scanned using a camera (not shown).
- Figure 6 shows a structure symmetrical to an axis of symmetry 56 which is perpendicular to the object 0, e.g. a print template.
- the axis of symmetry 56 also forms the central axis of the viewing angle for a scanning camera.
- the elliptical mirrors 58, 60 each form a structural unit with the printed circuit board 12. From direction 56, the light line created on object 0 can be freely accessed. In the arrangement shown, shadows are largely avoided.
- FIG. 7 shows a cross section of the structure of the elliptical mirror cylinder 62. It is produced by shaping a sheet, for example a thickness of 0.5 mm.
- FIG. 8 shows a perspective illustration of the elliptical cylinder mirror 62, on the edges of which fastening holes 64 are provided.
- the devices shown can be used particularly advantageously for image scanning systems, digital scanners and copying systems.
Landscapes
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Facsimile Scanning Arrangements (AREA)
- Lenses (AREA)
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AT02716794T ATE527814T1 (de) | 2001-02-20 | 2002-02-20 | Vorrichtung und verfahren zum zeilenförmigen beleuchten eines objektes mittels leds und eines elliptischen spiegels |
US10/468,616 US7012241B2 (en) | 2001-02-20 | 2002-02-20 | Device and method for linear illumination of an object using LEDs and elliptical mirrors |
EP02716794A EP1362473B1 (de) | 2001-02-20 | 2002-02-20 | VORRICHTUNG UND VERFAHREN ZUM ZEILENFÖRMIGEN BELEUCHTEN EINES OBJEKTES MITTELS LEDs UND EINES ELLIPTISCHEN SPIEGELS |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE10108075A DE10108075A1 (de) | 2001-02-20 | 2001-02-20 | Vorrichtung und Verfahren zum zeilenförmigen Beleuchten eines Objektes mittels LEDs und eines elliptischen Spiegels |
DE10108075.1 | 2001-02-20 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2002067567A1 true WO2002067567A1 (de) | 2002-08-29 |
Family
ID=7674815
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP2002/001797 WO2002067567A1 (de) | 2001-02-20 | 2002-02-20 | VORRICHTUNG UND VERFAHREN ZUM ZEILENFÖRMIGEN BELEUCHTEN EINES OBJEKTES MITTELS LEDs UND EINES ELLIPTISCHEN SPIEGELS |
Country Status (5)
Country | Link |
---|---|
US (1) | US7012241B2 (de) |
EP (1) | EP1362473B1 (de) |
AT (1) | ATE527814T1 (de) |
DE (1) | DE10108075A1 (de) |
WO (1) | WO2002067567A1 (de) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE10249208A1 (de) * | 2002-10-22 | 2004-03-18 | Osram Opto Semiconductors Gmbh | Beleuchtungsvorrichtung und Lesegerät mit einer solchen Beleuchtungsvorrichtung |
DE102016109803B3 (de) * | 2016-05-27 | 2017-07-06 | Eyec Gmbh | Inspektionsvorrichtung und Inspektionsverfahren zur Inspektion des Oberflächenbildes einer einen Prüfling darstellenden Flachsache |
Families Citing this family (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1452010A2 (de) * | 2001-11-23 | 2004-09-01 | Oce Document Technologies Gmbh | Einrichtung und verfahren zum abtasten einer vorlage unter anwendung einer hebe- und drehbewegung einer kamera |
EP1653271B1 (de) * | 2004-10-29 | 2008-08-13 | Swarovski Optik KG | Strichplatte und deren Verwendung für ein Zielfernrohr |
CN100367072C (zh) * | 2004-12-21 | 2008-02-06 | 亚洲光学股份有限公司 | 具有高反射性反光层的扫描单元 |
US20060214123A1 (en) * | 2005-03-24 | 2006-09-28 | Eastman Kodak Company | Linear illumination using cylindrical elliptical reflective surface |
JP2007013913A (ja) * | 2005-05-30 | 2007-01-18 | Toyota Industries Corp | 照明装置および原稿読取装置 |
DE102005031647A1 (de) * | 2005-07-06 | 2007-01-11 | Chromasens Gmbh | Beleuchtungsvorrichtung zur Dunkelfeldbeleuchtung für eine optische Testvorrichtung und Verfahren zum optischen Abtasten eines Objektes |
DE102006017912B4 (de) | 2006-04-18 | 2009-04-16 | Chromasens Gmbh | Beleuchtungssystem zur zeilenförmigen Beleuchtung |
US8982125B1 (en) * | 2014-05-15 | 2015-03-17 | Chaos Software Ltd. | Shading CG representations of materials |
US11370231B2 (en) | 2017-04-07 | 2022-06-28 | Phoseon Technology, Inc. | Pivoted elliptical reflector for large distance reflection of ultraviolet rays |
Citations (3)
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US4287414A (en) * | 1979-06-29 | 1981-09-01 | International Business Machines Corp. | Illumination and pick up apparatus |
US4422100A (en) * | 1982-03-08 | 1983-12-20 | The Mead Corporation | Document scanning apparatus |
JPH08307610A (ja) * | 1995-05-12 | 1996-11-22 | Nikon Corp | 画像読取装置 |
Family Cites Families (10)
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FR1237467A (fr) * | 1959-10-08 | 1960-07-29 | Appareil pour la concentration de sources de rayonnement | |
DE2217421A1 (de) * | 1972-04-12 | 1973-10-25 | Willi Dost | Geraet zur buendelung von strahlen |
US4657721A (en) * | 1973-05-21 | 1987-04-14 | Kms Fusion, Inc. | Target illumination |
JPS56106257A (en) * | 1980-01-30 | 1981-08-24 | Ricoh Co Ltd | Illumination apparatus of copying machine |
JPH0312305A (ja) * | 1989-06-08 | 1991-01-21 | Sumitomo Metal Ind Ltd | 廃塩酸の回収方法 |
DE4123916C2 (de) * | 1990-07-19 | 1998-04-09 | Reinhard Malz | Verfahren und Vorrichtung zum beleuchtungsdynamischen Erkennen und Klassifizieren von Oberflächenmerkmalen und -defekten eines Objektes |
US5828050A (en) | 1990-08-03 | 1998-10-27 | Symbol Technologies, Inc. | Light emitting laser diode scanner |
US5412205A (en) | 1993-11-18 | 1995-05-02 | Logitech, Inc. | Scanner with a wing-shaped fluorescent tube housing and dual-faceted scan window |
DE19532877A1 (de) * | 1995-09-06 | 1997-03-13 | Giesecke & Devrient Gmbh | Vorrichtung zur linienförmigen Beleuchtung von Blattgut, wie z. B. Banknoten oder Wertpapiere |
US6133565A (en) * | 1997-08-12 | 2000-10-17 | Rohm Co., Ltd. | Image reading apparatus |
-
2001
- 2001-02-20 DE DE10108075A patent/DE10108075A1/de not_active Ceased
-
2002
- 2002-02-20 AT AT02716794T patent/ATE527814T1/de active
- 2002-02-20 WO PCT/EP2002/001797 patent/WO2002067567A1/de active Application Filing
- 2002-02-20 US US10/468,616 patent/US7012241B2/en not_active Expired - Lifetime
- 2002-02-20 EP EP02716794A patent/EP1362473B1/de not_active Expired - Lifetime
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4287414A (en) * | 1979-06-29 | 1981-09-01 | International Business Machines Corp. | Illumination and pick up apparatus |
US4422100A (en) * | 1982-03-08 | 1983-12-20 | The Mead Corporation | Document scanning apparatus |
JPH08307610A (ja) * | 1995-05-12 | 1996-11-22 | Nikon Corp | 画像読取装置 |
Non-Patent Citations (1)
Title |
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PATENT ABSTRACTS OF JAPAN vol. 1997, no. 03 31 March 1997 (1997-03-31) * |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE10249208A1 (de) * | 2002-10-22 | 2004-03-18 | Osram Opto Semiconductors Gmbh | Beleuchtungsvorrichtung und Lesegerät mit einer solchen Beleuchtungsvorrichtung |
DE102016109803B3 (de) * | 2016-05-27 | 2017-07-06 | Eyec Gmbh | Inspektionsvorrichtung und Inspektionsverfahren zur Inspektion des Oberflächenbildes einer einen Prüfling darstellenden Flachsache |
EP3258244A2 (de) | 2016-05-27 | 2017-12-20 | Eyec GmbH | Inspektionsvorrichtung und inspektionsverfahren zur inspektion des oberflächenbildes einer einen prüfling darstellenden flachsache |
US10215708B2 (en) | 2016-05-27 | 2019-02-26 | Eyec Gmbh | Inspection apparatus and inspection method for inspection of the surface appearance of a flat item that represents a test specimen |
Also Published As
Publication number | Publication date |
---|---|
EP1362473B1 (de) | 2011-10-05 |
ATE527814T1 (de) | 2011-10-15 |
US20040075047A1 (en) | 2004-04-22 |
EP1362473A1 (de) | 2003-11-19 |
US7012241B2 (en) | 2006-03-14 |
DE10108075A1 (de) | 2002-09-19 |
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