EP0031556A1 - Lichtquelle zur Zeilenanalyse eines Schriftstücks - Google Patents
Lichtquelle zur Zeilenanalyse eines Schriftstücks Download PDFInfo
- Publication number
- EP0031556A1 EP0031556A1 EP80108040A EP80108040A EP0031556A1 EP 0031556 A1 EP0031556 A1 EP 0031556A1 EP 80108040 A EP80108040 A EP 80108040A EP 80108040 A EP80108040 A EP 80108040A EP 0031556 A1 EP0031556 A1 EP 0031556A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- tube
- document
- line
- analysis
- source according
- 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
Links
Images
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 slot over its entire length is associated with the tube so as to limit transversely the dimensions of the beam falling on the document and / or avoid direct illumination of the photodetector array 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 analysis results.
- 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 connected respectively to two gas reserve chambers in which two electrodes are arranged. operating tube respectively, said tube being externally equipped with a priming electrode disposed between the two operating electrodes, characterized in that said inner channel is over the useful length of said tube intended to be opposite the document a capillary channel and that, over its useful length, said tube has a thick wall, the cross section of which, on a portion facing the document, is substantially V-shaped with a 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.
- a light source 1 of a document 2 has been illustrated 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 light the successive lines to analyze the document, it belongs to a facsimile transmitter 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 lit 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 channel 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 voltage of operation at the operating electrodes and the ignition voltage at the ignition electrode at each control signal on the 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 makes it possible, thanks to its capillary channel, to adjust without too much excess the quantity 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 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)
- Investigating, Analyzing Materials By Fluorescence Or Luminescence (AREA)
- Vessels And Coating Films For Discharge Lamps (AREA)
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 true EP0031556A1 (de) | 1981-07-08 |
EP0031556B1 EP0031556B1 (de) | 1983-06-29 |
Family
ID=9233186
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP80108040A Expired EP0031556B1 (de) | 1979-12-27 | 1980-12-19 | Lichtquelle zur Zeilenanalyse eines Schriftstücks |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP0031556B1 (de) |
CA (1) | CA1162969A (de) |
DE (1) | DE3063996D1 (de) |
FR (1) | FR2472833A1 (de) |
IE (1) | IE50763B1 (de) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0325157A1 (de) * | 1988-01-20 | 1989-07-26 | Heimann GmbH | Gasentladungslampe |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2284046A (en) * | 1939-11-21 | 1942-05-26 | Doane Products Corp | Fluorescent lamp |
FR2050868A5 (de) * | 1969-06-27 | 1971-04-02 | Meyer Yves | |
FR2139860A1 (de) * | 1971-04-28 | 1973-01-12 | Multiblitz Mannesmann Gmbh Co | |
FR2150908A1 (de) * | 1971-08-28 | 1973-04-13 | Philips Nv |
-
1979
- 1979-12-27 FR FR7931746A patent/FR2472833A1/fr active Granted
-
1980
- 1980-12-19 DE DE8080108040T patent/DE3063996D1/de not_active Expired
- 1980-12-19 EP EP80108040A patent/EP0031556B1/de not_active Expired
- 1980-12-23 IE IE272480A patent/IE50763B1/en unknown
- 1980-12-24 CA CA000367521A patent/CA1162969A/fr not_active Expired
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2284046A (en) * | 1939-11-21 | 1942-05-26 | Doane Products Corp | Fluorescent lamp |
FR2050868A5 (de) * | 1969-06-27 | 1971-04-02 | Meyer Yves | |
FR2139860A1 (de) * | 1971-04-28 | 1973-01-12 | Multiblitz Mannesmann Gmbh Co | |
GB1346521A (en) * | 1971-04-28 | 1974-02-13 | Multiblitz Mannesmann Gmbh Co | Flash lighting arrangement |
FR2150908A1 (de) * | 1971-08-28 | 1973-04-13 | Philips Nv |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0325157A1 (de) * | 1988-01-20 | 1989-07-26 | Heimann GmbH | Gasentladungslampe |
Also Published As
Publication number | Publication date |
---|---|
EP0031556B1 (de) | 1983-06-29 |
IE802724L (en) | 1981-06-27 |
FR2472833A1 (fr) | 1981-07-03 |
IE50763B1 (en) | 1986-07-09 |
FR2472833B1 (de) | 1982-09-03 |
DE3063996D1 (en) | 1983-08-04 |
CA1162969A (fr) | 1984-02-28 |
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Legal Events
Date | Code | Title | Description |
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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 |
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AK | Designated contracting states |
Designated state(s): BE DE GB IT LU NL |
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17P | Request for examination filed |
Effective date: 19811028 |
|
ITF | It: translation for a ep patent filed |
Owner name: JACOBACCI & PERANI S.P.A. |
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GRAA | (expected) grant |
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AK | Designated contracting states |
Designated state(s): BE DE GB IT LU NL |
|
REF | Corresponds to: |
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