EP0031556B1 - Source d'éclairage pour analyse ligne par ligne d'un document - Google Patents

Source d'éclairage pour analyse ligne par ligne d'un document Download PDF

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Publication number
EP0031556B1
EP0031556B1 EP80108040A EP80108040A EP0031556B1 EP 0031556 B1 EP0031556 B1 EP 0031556B1 EP 80108040 A EP80108040 A EP 80108040A EP 80108040 A EP80108040 A EP 80108040A EP 0031556 B1 EP0031556 B1 EP 0031556B1
Authority
EP
European Patent Office
Prior art keywords
tube
document
source according
line
analysis
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.)
Expired
Application number
EP80108040A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0031556A1 (fr
Inventor
Gérard Biron
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.)
Alcatel CIT SA
Original Assignee
Compagnie Industrielle de Telecommunication CIT Alcatel SA
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 Compagnie Industrielle de Telecommunication CIT Alcatel SA filed Critical Compagnie Industrielle de Telecommunication CIT Alcatel SA
Publication of EP0031556A1 publication Critical patent/EP0031556A1/fr
Application granted granted Critical
Publication of EP0031556B1 publication Critical patent/EP0031556B1/fr
Expired legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J61/00—Gas-discharge or vapour-discharge lamps
    • H01J61/70—Lamps with low-pressure unconstricted discharge having a cold pressure < 400 Torr
    • H01J61/80—Lamps suitable only for intermittent operation, e.g. flash lamp

Definitions

  • the present invention relates to a light source for line-by-line analysis of a document in particular by a linear array of photodetectors, these photodetectors being in number equal to that of the image points of the line given by the desired definition of analysis. .
  • any system for analyzing a document line using a photodetector array requires uniform illumination of the document over the entire length of an analysis line.
  • a fluorescent tube slightly longer than the width of the document and used at a short distance from the document is used as the lighting source; the source can also be formed from two fluorescent tubes also of length slightly greater than the width of the document, these two tubes being arranged symmetrically on either side of the analysis zone, at a short distance from the document.
  • a reflector provided with a narrow slit along its entire length is associated with the tube so as to transversely restrict the dimen- s i ons of the beam incident on the document and / or prevent direct illumination of the strip of photodetectors from the tube.
  • the object of the present invention is to remedy these drawbacks in particular by making it possible, in particular, with scrolling at high continuous speed of the document, to allocate to the analysis time a time substantially equal to that of scrolling from one line to the next. 'other without affecting the results of analysis.
  • the subject of the present invention is a light source for line-by-line analysis of a document, constituted by a flash tube having an internal channel, the ends of which are respectively connected to two gas reserve chambers in which two electrodes are arranged. operation of the tube respectively, said tube being externally equipped with a priming electrode disposed between the two operating electrodes, characterized in that said inner channel is along the useful length of said tube intended to be opposite the document a capillary channel and that, over its useful length, said tube is thick-walled, the section of which is, on a portion facing the document, substantially V-shaped with rounded angle to form a magnifying glass incorporated in the wall of the tube.
  • the light source comprises a reflector on a part of the tube opposite to that forming a magnifying glass.
  • FIG. 1 there is illustrated a light source 1 of a document 2 to be analyzed line by line during its drive by a drive roller 3 carrying an end pinion 4 driven by a shaft pinion motor 5.
  • the light source 1 is connected to a supply circuit 6 having a control input 7.
  • the light source 1 is intended to illuminate the successive lines to be analyzed of the document, it belongs to a fac emitter -similar comprising, as is well known for the analysis of successive lines of the document, a linear array of photo-detectors, not shown, receiving the light beam returned by the lines successively illuminated by the source.
  • the source 1 illustrated in FIGS. 1 to 3 is a flash tube also designated by the general reference 1, the internal channel for the gas, for example Xenon, to be ionized is a capillary channel 10.
  • This capillary channel is of substantially length equal to the width of document 2 and defines the useful part of the tube. Over the length of the capillary channel, the wall of the tube is of considerable thickness.
  • the capillary canal 10 is connected to two gas reserve chambers 11 and 12, respectively at the two ends of the tube.
  • the tube is further equipped with two operating electrodes 13 and 14 inside the gas reserve chambers respectively and with a priming electrode constituted by a metal spiral 15 which is wound around the tube in the vicinity of one of the electrodes and which extends to the vicinity of the other electrode by a metallized track, not visible here, deposited on the external surface of the tube.
  • the section of the tube over its useful length is substantially triangular, it has here the shape of an isosceles triangle whose angles are rounded and the sides rounded.
  • this section may be of different shape, it will in any case have a portion, referenced 16 in FIG. 3, delimited in V with rounded angle on the part of the tube intended to be opposite the document, to form a magnifying glass incorporated into the wall of the tube over its useful length.
  • the part of the tube opposite to that forming a magnifying glass can be semi-cylindrical.
  • the tube is further equipped on the part opposite to that forming a magnifying glass with a reflector 17, formed by a layer of white paint, on the external wall of the tube in this part.
  • the operating electrodes 13 and 14 and the ignition electrode 15 are connected to the supply circuit 6 supplying the operating voltage to the operating electrodes and the ignition voltage to the ignition electrode at each control signal on input 7.
  • This circuit 6 is of known type and is therefore not described here.
  • the control signal applied to input 7 is of rhythm defined by the rhythm of scrolling of the successive lines of the document to be analyzed.
  • This flash tube with capillary channel and incorporated magnifying glass forms a light source of small transverse dimension which can be placed at a short distance from the document to illuminate the successive lines to be analyzed, this promoting the uniformity of the illumination along each line, and which can provide the power necessary for the analysis of each of the lines by the photodetector array in a very short time.
  • this light source allows, thanks to its capillary channel, to adjust without too much excess the amount of gas between the electrodes to that which will be ionized, this to ensure the almost total ionization of the gas contained in the capillary channel and thus to favor the production of a uniform flash along the tube, therefore of the line to be analyzed.
  • the thick wall of the tube gives good mechanical resistance to the light source which, when mounted in an analysis device or facsimile transmitter, is subjected to vibrations and allows, opposite the analysis line, to play the role of magnifying glass incorporated in the tube to focus the light from the tube on the document line.
  • the capillary channel will be chosen with a diameter between 0.2 and 1 mm and preferably from 0.25 to 0.5 mm, for a vertical definition of 4 to 8 analysis points. to the millimeter, and the tube of larger transverse dimension reduced to 5 or 6 mm.
  • This source allows the analysis of a document driven continuously or step by step, at fixed or variable speed and in particular at very high speed: successive flashes triggered in correspondence providing sufficient lighting power in very short durations, the running time of successive lines in front of the source can be used almost entirely for the analysis of the content of these lines respectively.
  • the rapidity of the lighting of each of the successive lines of document makes it possible to form a fixed image of each of these lines on the linear bar of analysis, the bar. "sees” then each of the lines as being fixed.

Landscapes

  • Facsimile Scanning Arrangements (AREA)
  • Investigating Or Analysing Materials By Optical Means (AREA)
  • Vessels And Coating Films For Discharge Lamps (AREA)
  • Investigating, Analyzing Materials By Fluorescence Or Luminescence (AREA)
EP80108040A 1979-12-27 1980-12-19 Source d'éclairage pour analyse ligne par ligne d'un document Expired EP0031556B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR7931746A FR2472833A1 (fr) 1979-12-27 1979-12-27 Source d'eclairage pour analyse ligne par ligne d'un document
FR7931746 1979-12-27

Publications (2)

Publication Number Publication Date
EP0031556A1 EP0031556A1 (fr) 1981-07-08
EP0031556B1 true EP0031556B1 (fr) 1983-06-29

Family

ID=9233186

Family Applications (1)

Application Number Title Priority Date Filing Date
EP80108040A Expired EP0031556B1 (fr) 1979-12-27 1980-12-19 Source d'éclairage pour analyse ligne par ligne d'un document

Country Status (5)

Country Link
EP (1) EP0031556B1 (show.php)
CA (1) CA1162969A (show.php)
DE (1) DE3063996D1 (show.php)
FR (1) FR2472833A1 (show.php)
IE (1) IE50763B1 (show.php)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE8800632U1 (de) * 1988-01-20 1989-05-18 Heimann Optoelectronics Gmbh, 65199 Wiesbaden Gasentladungslampe

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2284046A (en) * 1939-11-21 1942-05-26 Doane Products Corp Fluorescent lamp
FR2050868A5 (show.php) * 1969-06-27 1971-04-02 Meyer Yves
FR2139860A1 (show.php) * 1971-04-28 1973-01-12 Multiblitz Mannesmann Gmbh Co
FR2150908A1 (show.php) * 1971-08-28 1973-04-13 Philips Nv

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2284046A (en) * 1939-11-21 1942-05-26 Doane Products Corp Fluorescent lamp
FR2050868A5 (show.php) * 1969-06-27 1971-04-02 Meyer Yves
FR2139860A1 (show.php) * 1971-04-28 1973-01-12 Multiblitz Mannesmann Gmbh Co
FR2150908A1 (show.php) * 1971-08-28 1973-04-13 Philips Nv

Also Published As

Publication number Publication date
FR2472833A1 (fr) 1981-07-03
DE3063996D1 (en) 1983-08-04
FR2472833B1 (show.php) 1982-09-03
IE50763B1 (en) 1986-07-09
EP0031556A1 (fr) 1981-07-08
CA1162969A (fr) 1984-02-28
IE802724L (en) 1981-06-27

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