DE4020346A1 - Reflector for optical line scanner in imaging appts. - has window aligned with external reflection surface and spaced exit opening to provide two perpendicular beams - Google Patents

Reflector for optical line scanner in imaging appts. - has window aligned with external reflection surface and spaced exit opening to provide two perpendicular beams

Info

Publication number
DE4020346A1
DE4020346A1 DE19904020346 DE4020346A DE4020346A1 DE 4020346 A1 DE4020346 A1 DE 4020346A1 DE 19904020346 DE19904020346 DE 19904020346 DE 4020346 A DE4020346 A DE 4020346A DE 4020346 A1 DE4020346 A1 DE 4020346A1
Authority
DE
Germany
Prior art keywords
reflector
light source
line
light
exit opening
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.)
Granted
Application number
DE19904020346
Other languages
German (de)
Other versions
DE4020346C2 (en
Inventor
Kai Dipl Ing Spengler
Ernst-Ulrich Dr Rer Nat Berndt
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.)
Siemens AG
Original Assignee
Siemens AG
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 Siemens AG filed Critical Siemens AG
Priority to DE19904020346 priority Critical patent/DE4020346C2/en
Publication of DE4020346A1 publication Critical patent/DE4020346A1/en
Application granted granted Critical
Publication of DE4020346C2 publication Critical patent/DE4020346C2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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
    • H04N1/02845—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
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B27/00—Photographic printing apparatus
    • G03B27/32—Projection printing apparatus, e.g. enlarger, copying camera
    • G03B27/52—Details
    • G03B27/54—Lamp housings; Illuminating means
    • G03B27/542—Lamp housings; Illuminating means for copying cameras, reflex exposure lighting
    • 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
    • H04N1/02845—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
    • H04N1/0286—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 a light integrating, concentrating or defusing cavity

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Facsimile Scanning Arrangements (AREA)
  • Facsimile Heads (AREA)
  • Optical Elements Other Than Lenses (AREA)

Abstract

The reflector (A) encloses a light source (L) for providing a light intensity beam used for direct line scanning of an original (EA) and fed to a sensor device via a reading gap. The reflector (A) has an exit window (DC) aligned with an external reflector surface (C) and an exit opening (DC) which together provide 2 approximately perpendicular light beams directed onto a line of the scanned original (EA). The reflective surface (B) of the reflector (A) and the external reflector surface (C) each have a curvature corresponding to the radial distance from the light source (L). ADVANTAGE - Provides dual beam using single light source.

Description

Die Erfindung betrifft eine Reflektoreinrichtung für Zeilen­ sensoren von Abbildungseinrichtungen, bei denen eine Licht­ quelle mit der Reflektoreinrichtung eine Lichtintensitäts­ bündelung erzeugt, mit der die Zeile einer Abbildungsvorlage unmittelbar abtastbar und über einen Lesespalt einer Sensor­ einrichtung zuführbar ist.The invention relates to a reflector device for lines sensors of imaging devices where a light source a light intensity with the reflector device bundling with which the line of an illustration template immediately scanned and via a reading gap of a sensor device can be fed.

Eine derartige Reflektoreinrichtung ist aus der DE-35 27 300 A1 in Verbindung mit einer Bildlesevorrichtung zu entnehmen. Hier wird im Zusammenhang mit der Diskussion zum Stand der Technik dargelegt, daß zwei Lichtquellen mit Lichtintensitätsbündelung auf die abzubildende Zeile der Abbildungsvorlage zu lenken und mittels einer sogenannten Linsenzeile der Sensoreinrichtung, einem Fotosensor, zu übertragen sind.Such a reflector device is from DE-35 27 300 A1 to be taken in connection with an image reading device. Here becomes state of the art in connection with the discussion stated that two light sources with light intensity focusing to point to the line of the illustration to be reproduced and by means of a so-called lens line of the sensor device, a photo sensor to be transmitted.

Zur Verbesserung der Signalübertragung wird der Einsatz von Fotosensoren mit Signalaufspeicherungen vorgeschlagen, bei denen statt zwei Lichtquellen nur noch eine Lichtquelle erfor­ derlich ist. Durch diese Maßnahme sind die Kosten der Bildlese­ vorrichtung und auch die Betriebskosten insgesamt gesenkt, allerdings ist durch den Wegfall der zweiten Lichtquelle die Lichtintensität zur Abtastung der Zeile erheblich gemindert. Darüber hinaus ist durch die einseitige Beleuchtung der zu lesenden Zeile wegen des Schattenwurfes mit Abbildungsunschär­ fen zu rechnen, die insbesondere im Übergangsbereich zwischen Hell und Dunkel zu sogenannten Verschmierungen führen.To improve the signal transmission, the use of Photo sensors with signal storage suggested at which need only one light source instead of two is such. This measure means the cost of image reading device and also reduced the overall operating costs, however, by eliminating the second light source, the Light intensity for scanning the line significantly reduced. In addition, the one-sided lighting of the reading line because of the shadow cast with picture blur to be expected, particularly in the transition area between Light and dark lead to so-called smearing.

Die der Erfindung zugrundeliegende Aufgabe besteht darin, eine Reflek­ toreinrichtung zu definieren, mit der die Nachteile hinsicht­ lich der Verminderung der Lichtintensität vermieden und darüber hinaus der konstruktive Aufwand und die Betriebskosten solcher Reflektoreinrichtungen weiter zu optimieren sind. Erfindungs­ gemäß wird dies dadurch erreicht, daß die Reflektoreinrichtung durch auf die Zeile der Abbildungsvorlage fokussierende Reflek­ torteilbereiche eine Lichtintensitätsbündelung in zwei annä­ hernd rechtwinklig zueinander verlaufende Lichtbündel bewirkt, wobei die Reflektoreinrichtung die Lichtquelle mindestens teil­ weise umgibt und mit einer dem jeweiligen Reflektorbereich zugeordneten Durchtrittsöffnung versehen ist.The the The object underlying the invention is a reflect Define gate device with which the disadvantages are considered avoided and above the reduction in light intensity in addition, the design effort and the operating costs of such Reflector devices are to be further optimized. Invention  according to this is achieved in that the reflector device by reflecting on the line of the image template subareas a light intensity bundling in two approx causes light bundles running at right angles to one another, wherein the reflector device at least partially the light source surrounds wisely and with a respective reflector area assigned passage opening is provided.

Die in der erfindungsgemäßen Form angeordneten Reflektorteil­ bereiche mit ihrer zweifachen Lichtintensitätsbündelung gestat­ ten den Einsatz einer einzigen Lichtquelle. Trotzdem wird die abzubildende Zeile der Abbildungsvorlage in den zwei zueinander rechtwinklig stehenden Ebenen ohne Schattenwurf beleuchtet, da die Zeile das Licht der Lichtquelle durch die Durchtrittsöff­ nungen der Reflektoreinrichtung erhält.The reflector part arranged in the form according to the invention areas with their double light intensity concentration the use of a single light source. Nevertheless, the line of the image template to be mapped in the two to each other right-angled planes illuminated without shadows because the line the light from the light source through the passage opening receives the reflector device.

Gemäß einer vorteilhaften Ausgestaltung der Erfindung ist vor­ gesehen, daß die Durchtrittsöffnungen im Bereich des Hauptein­ strahlwinkels derart angeordnet sind, daß die Lichtintensitäts­ bündelung in unmittelbarem Bereich der Zeile der Abbildungs­ vorlage wirksam wird, so daß der Anteil von Streulicht weitgehend vermieden ist.According to an advantageous embodiment of the invention seen that the passage openings in the area of the main entrance beam angle are arranged such that the light intensity bundling in the immediate area of the line of the figures Template is effective, so that the proportion of stray light is largely avoided.

Dieser Effekt kann noch dadurch verstärkt werden, daß die Reflektorteilbereiche jeweils mit einem dem radialen Abstand zur Lichtquelle entsprechenden Krümmungsradius versehen sind, so daß die Fokussierung auf die Zeile noch wirkungsvoller ist.This effect can be reinforced by the fact that Partial reflector areas each with a radial distance are provided with a radius of curvature corresponding to the light source, so that focusing on the line is even more effective.

Die Erfindung wird durch ein figürlich dargestelltes Ausfüh­ rungsbeispiel näher erläutert, in dem lediglich die zum Ver­ ständnis notwendigen Teile auszugsweise schematisch darge­ stellt sind.The invention is illustrated by a figurative embodiment Example explained in more detail, in which only the ver parts of the necessary schematic diagram Darge represents are.

Die Reflektoreinrichtung A umgibt die Lichtquelle L bogenför­ mig, und bildet mit den Reflektorteilbereichen B, C eine gemein­ same Einrichtung zur Fokussierung des Lichts der Lichtquelle L auf die Zeile Z in der Ebene der Abbildungsvorlage EA. Die Ebene der Abbildungsvorlage EA ist mit der Außenkante der Glasplatte GP identisch. Der Reflektorteilbereich B ist ebenfalls bogenförmig um die Lichtquelle L angeordnet und bildet mit der Reflektoreinrichtung A und einer am Reflektor­ bereich B angeordneten Abdeckung die Durchtrittsöffnung DB zur Lichtintensitätsbündelung des Reflektorteilbereichs B. Deswei­ teren enthält die Reflektoreinrichtung A die Durchtrittsöffnung DC, mit der die Lichtintensitätsbündelung im Zusammenwirken mit dem Reflektorteilbereich C ebenfalls auf die Zeile Z der Abbil­ dungsvorlage realisiert ist. Weiterhin ist der nicht näher bezeichnete Lesespalt vorgesehen, der das reflektierte Licht von der Zeile Z der Ebene der Abbildungsvorlage EA in Pfeil­ richtung senkrecht zur nicht dargesellten Sensoreinrichtung SE überträgt. Die Durchtrittsöffnungen DB und DC sind so gewählt, daß die Lichtintensitätsbündelung durch die Reflektorteilbe­ reiche B, C in den unmittelbaren Bereich der Zeile Z der Abbil­ dungsvorlage wirksam wird.The reflector device A surrounds the light source L arc-shaped mig, and forms a common with the reflector sections B, C. same device for focusing the light of the light source L  on the line Z in the level of the illustration template EA. The The level of the illustration template EA is with the outer edge of the Glass plate GP identical. The reflector section B is also arranged in an arc around the light source L and forms with the reflector device A and one on the reflector Area B arranged cover the through opening DB Light intensity bundling of the reflector sub-area B. Deswei tere contains the reflector device A the passage opening DC, with which the light intensity bundle interacts with the reflector section C also on line Z of the figure template is realized. Furthermore, it is not closer designated reading gap provided the reflected light from line Z of the level of the illustration template EA in arrow direction perpendicular to the sensor device SE, not shown transmits. The through openings DB and DC are selected so that the light intensity concentration by the reflector part pass B, C in the immediate area of row Z of the fig template becomes effective.

Claims (3)

1. Reflektoreinrichtung für Zeilensensoren von Abbildungsein­ richtungen, bei denen eine Lichtquelle mit der Reflektorein­ richtung eine Lichtintensitätsbündelung erzeugt, mit der die Zeile einer Abbildungsvorlage unmittelbar abtastbar und über einen Lesespalt einer Sensoreinrichtung zuführbar ist, dadurch gekennzeichnet, daß die Reflek­ toreinrichtung (A) durch auf die Zeile (Z) der Abbildungsvorla­ ge fokussierende Reflektorteilbereiche (B, C) eine Lichtintensi­ tätsbündelung in zwei annähernd rechtwinklig zueinander verlau­ fende Lichtbündel bewirkt, wobei die Reflektoreinrichtung (A) die Lichtquelle (L) mindestens teilweise umgibt und mit einer dem jeweiligen Reflektorbereich zugeordneten Durchtrittsöffnung (DB, DC) versehen ist.1. reflector device for line sensors of Abbildein devices in which a light source with the Reflektorein device generates a light intensity bundle with which the line of an image template can be scanned directly and fed via a reading gap to a sensor device, characterized in that the reflector gate device (A) by on the line (Z) of the imaging template focusing reflector sub-regions (B, C) brings about a bundling of light intensities into two light bundles which are approximately perpendicular to one another, the reflector device (A) at least partially surrounding the light source (L) and with a passage opening assigned to the respective reflector region (DB, DC) is provided. 2. Reflektoreinrichtung nach Anspruch 1, dadurch gekennzeichnet, daß die Durchtrittsöffnungen (DB, DC) im Bereich des Haupteinstrahlwinkels derart angeordnet sind, daß die Lichtintensitätsbündelung im unmittelbaren Bereich der Zeile der Abbildungsvorlage wirksam wird.2. Reflector device according to claim 1, characterized characterized in that the passage openings (DB, DC) arranged in the area of the main angle of incidence are that the light intensity bundling in the immediate Area of the line of the picture template takes effect. 3. Reflektoreinrichtung nach Anspruch 1 und den Ansprüchen 1 und 2, dadurch gekennzeichnet, daß die Reflektorbereiche (B, C) jeweils mit einem dem radialen Abstand zur Lichtquelle (L) entsprechenden Krümmungsradius versehen sind.3. reflector device according to claim 1 and claims 1 and 2, characterized in that the reflector areas (B, C) each with a radial Distance to the light source (L) corresponding radius of curvature are provided.
DE19904020346 1990-06-22 1990-06-22 Reflector device for line sensors of imaging devices Expired - Fee Related DE4020346C2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE19904020346 DE4020346C2 (en) 1990-06-22 1990-06-22 Reflector device for line sensors of imaging devices

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19904020346 DE4020346C2 (en) 1990-06-22 1990-06-22 Reflector device for line sensors of imaging devices

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DE4020346A1 true DE4020346A1 (en) 1992-01-02
DE4020346C2 DE4020346C2 (en) 1996-06-20

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Citations (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR972902A (en) * 1941-06-06 1951-02-05 Combination reflector for image projection devices
DE1255476B (en) * 1965-01-07 1967-11-30 Rca Corp Device for illuminating a strip-shaped area of an object
DE2842104A1 (en) * 1977-09-27 1979-03-29 Tokyo Shibaura Electric Co EXPOSURE DEVICE FOR AN ELECTROPHOTOGRAPHIC COPIER
DE2913761A1 (en) * 1978-04-07 1979-10-11 Canon Kk SLIT LIGHTING DEVICE
DE3026952A1 (en) * 1979-07-16 1981-02-05 Canon Kk IMAGE GENERATION DEVICE
DE3000530A1 (en) * 1980-01-09 1981-07-16 Develop Dr. Eisbein Gmbh & Co, 7016 Gerlingen Glass fibre optic copier exposure system - has fibre parallel to exposure platen and deflection mirror input and output onto drum
DE3141452A1 (en) * 1980-10-20 1982-06-24 Xerox Corp., 14644 Rochester, N.Y. DOCUMENT SCANNER
DE3313186A1 (en) * 1983-04-12 1984-10-25 Computer Gesellschaft Konstanz Mbh, 7750 Konstanz LIGHTING DEVICE FOR AN ELECTROOPTIC SCANNER
EP0129289A2 (en) * 1983-06-15 1984-12-27 Philips Electronics Uk Limited A slit imaging system using two concave mirrors
US4518232A (en) * 1983-08-24 1985-05-21 Avco Everett Research Laboratory, Inc. Method and apparatus for optical beam shaping
DE3133168C2 (en) * 1980-08-23 1986-11-27 Ricoh Co., Ltd., Tokio/Tokyo Device for keeping constant the luminous flux supplied by a fluorescent tube of a fiber optic for a copier
DE3938355A1 (en) * 1988-11-17 1990-05-23 Asahi Optical Co Ltd Halogen light source for facsimile equipment or copier - has equalising reflector with different radii of curvature across width and low-reflectance areas along length

Patent Citations (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR972902A (en) * 1941-06-06 1951-02-05 Combination reflector for image projection devices
DE1255476B (en) * 1965-01-07 1967-11-30 Rca Corp Device for illuminating a strip-shaped area of an object
DE2842104A1 (en) * 1977-09-27 1979-03-29 Tokyo Shibaura Electric Co EXPOSURE DEVICE FOR AN ELECTROPHOTOGRAPHIC COPIER
DE2913761A1 (en) * 1978-04-07 1979-10-11 Canon Kk SLIT LIGHTING DEVICE
DE3026952A1 (en) * 1979-07-16 1981-02-05 Canon Kk IMAGE GENERATION DEVICE
DE3000530A1 (en) * 1980-01-09 1981-07-16 Develop Dr. Eisbein Gmbh & Co, 7016 Gerlingen Glass fibre optic copier exposure system - has fibre parallel to exposure platen and deflection mirror input and output onto drum
DE3133168C2 (en) * 1980-08-23 1986-11-27 Ricoh Co., Ltd., Tokio/Tokyo Device for keeping constant the luminous flux supplied by a fluorescent tube of a fiber optic for a copier
DE3141452A1 (en) * 1980-10-20 1982-06-24 Xerox Corp., 14644 Rochester, N.Y. DOCUMENT SCANNER
DE3313186A1 (en) * 1983-04-12 1984-10-25 Computer Gesellschaft Konstanz Mbh, 7750 Konstanz LIGHTING DEVICE FOR AN ELECTROOPTIC SCANNER
EP0129289A2 (en) * 1983-06-15 1984-12-27 Philips Electronics Uk Limited A slit imaging system using two concave mirrors
US4518232A (en) * 1983-08-24 1985-05-21 Avco Everett Research Laboratory, Inc. Method and apparatus for optical beam shaping
DE3938355A1 (en) * 1988-11-17 1990-05-23 Asahi Optical Co Ltd Halogen light source for facsimile equipment or copier - has equalising reflector with different radii of curvature across width and low-reflectance areas along length

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
JP 58-174937 A. In: Patents Abstracts of Japan. P-249, Jan.21, 1984 Vol.8/No.14 *

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