EP1170140B1 - Wärmeempfindliches Aufzeichnungsmaterial mit einem uniformen Filmrand - Google Patents
Wärmeempfindliches Aufzeichnungsmaterial mit einem uniformen Filmrand Download PDFInfo
- Publication number
- EP1170140B1 EP1170140B1 EP01000013A EP01000013A EP1170140B1 EP 1170140 B1 EP1170140 B1 EP 1170140B1 EP 01000013 A EP01000013 A EP 01000013A EP 01000013 A EP01000013 A EP 01000013A EP 1170140 B1 EP1170140 B1 EP 1170140B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- sheet
- thermal
- roller
- image
- drum
- 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 - Lifetime
Links
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J11/00—Devices or arrangements of selective printing mechanisms, e.g. ink-jet printers or thermal printers, for supporting or handling copy material in sheet or web form
- B41J11/008—Controlling printhead for accurately positioning print image on printing material, e.g. with the intention to control the width of margins
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J13/00—Devices or arrangements of selective printing mechanisms, e.g. ink-jet printers or thermal printers, specially adapted for supporting or handling copy material in short lengths, e.g. sheets
- B41J13/02—Rollers
- B41J13/03—Rollers driven, e.g. feed rollers separate from platen
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
- B41J2/315—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective application of heat to a heat sensitive printing or impression-transfer material
- B41J2/32—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective application of heat to a heat sensitive printing or impression-transfer material using thermal heads
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J25/00—Actions or mechanisms not otherwise provided for
- B41J25/304—Bodily-movable mechanisms for print heads or carriages movable towards or from paper surface
- B41J25/312—Bodily-movable mechanisms for print heads or carriages movable towards or from paper surface with print pressure adjustment mechanisms, e.g. pressure-on-the paper mechanisms
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
- B41M5/00—Duplicating or marking methods; Sheet materials for use therein
- B41M5/26—Thermography ; Marking by high energetic means, e.g. laser otherwise than by burning, and characterised by the material used
Definitions
- the present invention relates to a thermal-sensitive film bearing a radiographic image.
- the present invention particularly relates to a thermal-sensitive sheet having a transparent support and bearing an image for medical diagnostic purposes.
- Thermal imaging or thermography is a recording process wherein images are generated by the use of image-wise modulated thermal energy.
- thermography two approaches are known :
- Common thermal printers comprise a rotatable drum and an elongate thermal head which is spring-biased towards the drum to firmly line-wise contact a heat-sensitive material which is passed between the head and the drum.
- the thermal head includes a plurality of heating elements and corresponding drivers and shift registers for these elements.
- the image-wise heating of a sheet is performed on a line by line basis, with the heating resistors geometrically juxtaposed along each other in a bead-like row running parallel to the axis of the drum.
- Each of these resistors is capable of being energised by heating pulses, the energy of which is controlled in accordance with the required density of the corresponding picture element.
- the sheet i.e. the image receiving sheet
- a dye donor sheet or web is conveyed by frictional contact with the rotating sheet past the thermal head.
- a single heat-sensitive sheet is conveyed between the thermal head and the drum, and the image is directly produced in the sheet.
- the sheet is not attached to the drum but is advanced between the head and the drum by frictional contact of its rearside with the drum.
- sheets that are printed in this way cause a problem when viewing the printed images on a light box.
- the images are often printed on a transparent support for diagnostic purposes, medical diagnosis in particular. Examples of medical diagnosis are echograms, CT scans and NMR images. These images are negative-type images, what means that their background is substantially black, the image details having lesser optical densities.
- These images are viewed on a light box and in this connection it is a drawback that the end of the sheet which was leading during image printing is transparent because it had to be freely passed between the thermal head and the print drum before the thermal head could be closed and image-wise printing could start. Radiologists are unfamiliar with such large open image margin which does not exist in conventional AgX X-ray images. Moreover, such open area has a dazzling effect.
- Patent US-A-4 996 537 discloses a heat sensitive recording material that is produced by means of a number of wet processing steps. When imaging this material, the unheated material is coloured and the thermally imaged area gets a lower density by heating.
- EP-A-0 846 565 discloses a thermal printer that solves the problem of insufficient control of the actual speed of advance mentioned above.
- the thermal printer of EP-A-0 846 565 has pressure means (17) for urging a section of the sheet against the print drum, in order to provide excellent control of the printing speed so that images of high quality can be produced.
- thermal printing on a transparent sheet, on a poly(ethylene terephthalate) support in particular is preferably done while keeping unprinted margins all around the sheet since the risk is great for damaging the head or reducing its lifetime by contact with the edges of a sheet. These edges are often sharp and destructive for any surface in sliding contact therewith.
- the width of a sheet to be printed is, in this application, slightly smaller than the length of the thermal head but the lateral sheet edges are not printed, and the head is put in contact with the sheet only after the front edge of the sheet has passed the head and is withdrawn before the trailing end of the sheet arrives. Further, the sheet is duly laterally aligned before the thermal head takes its printing position. The result of all this is a transparent marginal frame on the sheet with a uniform width which as such is not disturbing because it can be of the order of magnitude of 5 mm only.
- a thermal-sensitive film having the features as claimed in claim 1 is provided.
- Such a thermal-sensitive film may be obtained by a thermal printer as disclosed in EP-A-0 846 565. This printer is described in detail hereinafter.
- the printer disclosed in EP-A-0 846 565 suitably is operated in such a way that, as the thermal head is in its operative position but the pressure means is still inoperative, the leading margin of the sheet is printed at a high image density, i.e. pre-printing, to avoid dazzling effects and, after the pressure means became operative, image-wise printing as such is started.
- a high image density i.e. pre-printing
- the present invention includes a novel thermal print on a transparent support bearing a radiographic image.
- a radiographic image is characterised thereby that it has an unprinted peripheral margin.
- the radiographic image may have a black band on one of its side edges. This band may be provided, if desired, with identification data in the form of indicia of a lesser optical density.
- Preferred embodiments of the thermal printer according to EP-A-0 846 565 are as follows.
- the pressure means is formed by roller means which is displaceable towards the print drum in parallel relationship therewith.
- the mentioned roller means comprises a plurality of axially spaced roller sections mounted for individual biasing.
- the printer may comprise control means controlling the movements of the thermal head and of the pressure means in such a way that first the thermal head is moved from its rest to its operative position to engage the sheet, and next the pressure means is operated to urge the leading sheet end on the print drum.
- the print drum suitably is briefly rotated as the leading sheet end is introduced between the head and drum in order not to possibly hinder the sheet advance as the sheet is in frictional contact with the drum, and then the thermal head is urged towards the drum, the drum is started to advance the sheet, and the pressure means is closed to angularly deflect the sheet, in succession.
- Fig. 1 shows the general layout of one embodiment of a thermal printer according to EP-A-0 846 565.
- the apparatus is mounted in a housing 10 which comprises means for holding a stack 12 of sheets to be printed in an inwardly tilted position, a dispenser roller 13 for removing the sheets one by one from the stack and for conveying them upwardly, a print drum 15 as known in the art and driven by motor 23, a thermal head 16, a sheet pressure roller 17, sheet guides 18 and sheet driving rollers 19, a de-curl roller 20, an outlet tray 21, and control means 22 for controlling image acquisition and processing.
- Thermal head 16 is mounted on a rigid frame 24 which is pivotable about axis 25 running strictly parallel with the print drum axis. Frame 24 bears at its free end a follower roller 26 riding on a rotatable cam 27, see Fig. 2.
- a tension spring 28 urges the frame in the direction of the print drum.
- Pressure roller 17 is mounted for free rotation in a frame 29 which is pivotable about shaft 30 running likewise parallel to the print drum.
- Frame 29 bears at its free end a follower roller 31 riding on a cam 32.
- a tension spring 34 causes frame 29 to urge roller 17 towards the print drum.
- cams 27 and 32 are mounted in the angular relationship as shown on a common shaft 35 which is rotatable by a motor 36.
- Dispenser roller 13 is controlled to remove the upper sheet 38 from stack 12 and convey it upwardly until its leading end takes a position between print drum 15 and thermal head 16 as shown in Fig. 2.
- Sheet 38 is in this example a heat-sensitive sheet having a heat-sensitive layer coated on a poly(ethylene terephthalate) support.
- Suitable thermographic materials for medical imaging based on silver behenate in thermal working relationship with a reducing agent are disclosed in our co-pending EP patent applications 00 66 9875, 00 66 9876 and 00 72 6852.
- motor 36 is energised to rotate the cam mechanism counter-clockwise until cam 27 takes a position as shown in Fig. 3.
- roller 26 is free from cam 27 and thermal head 16 is with its array of printing elements 39 urged in contact with sheet 38 by spring 28.
- Printing array 39 slightly deflects leading end 38' of the sheet so that it extends almost vertical according to the figure. The width of unprinted leading end 38' amounts to a'.
- motor 23 is energised to rotate print drum 15 over a certain angle in anti-clockwise direction so that now the size of leading end 38' of the sheet is increased until the leading edge of the sheet reaches beyond pressure roller 17, see Fig. 4.
- thermal head 16 was energised to pre-print the sheet and this until the leading sheet end has increased to the size shown in Fig. 4.
- the described pre-printing action of the thermal head produces a black leading zone a on the sheet, except for the very leading margin a' which remains transparent since it was introduced past printing array 39 without any printing contact therewith. Black zone a is desirable for waiving the otherwise disturbing effect of a notable unprinted area of the sheet.
- black stands in the present example for an optical density which equals approximately the maximum density of the radiographic image, e.g. a density of 3.0 or slightly less.
- motor 36 is energised again to further rotate the cam mechanism in counter-clockwise direction so that cam 32 takes a position as shown in Fig. 5 allowing spring 34 to pull pressure roller 17 against the print drum by rotation of frame 29 round shaft 30, thereby deflecting the leading end of the sheet as shown.
- This deflection extends over an angle ⁇ and provides a substantial frictional engagement of the sheet by the print drum so that now the sheet advance by the driven print drum is well under control.
- Image-wise printing can start up from the moment pressure roller 17 is urged against the print drum, and the apparatus suitably comprises control means for controlling the printing operation as a function of the position of this pressure roller.
- roller 20 is a heated roller in contact with the rear side of the sheet in order to compensate for curling stresses which have been introduced in the sheet by the image-wise heating of its front side.
- EP 0 679 519 A2 entitled “Thermal dye transfer printing process” wherein the uniform heating of a sheet at its rear side to reduce curling is disclosed.
- the driving and the machining of the de-curl roller are in principle less accurate than those of the print drum and therefore it is desirable not to let interfere the sheet drive of roller 20 with that of drum 15.
- the length of the sheet path between 15 and 20 is larger than the length of the largest sheet to be printed in the apparatus, and the sheet transport between both said rollers can occur by driven pressure rollers 19 taking an open position as shown in Fig. 1, and being closed as the last image line on the sheet has been printed to take over the sheet drive from the print drum before the trailing sheet edge passes beyond printing array 39.
- pressure roller 17 may be a simple cylindrical metal roller covering the full width of the print drum, we have found that the precision of such roller should meet high standards in order to avoid damaging the newly printed image and/or disturbing the correct sheet drive.
- a suitable embodiment of this roller is one which is composed of a plurality of roller sections 42 mounted for free rotation in yokes 43 pivotally mounted on a stationary shaft 44 which is fitted in frame 29 and which bears helical springs 48 for individually biasing each roller section towards the print drum.
- a suitable embodiment of this roller is one which is composed of a plurality of roller sections 42 mounted for free rotation in yokes 43 pivotally mounted on a stationary shaft 44 which is fitted in frame 29 and which bears helical springs 48 for individually biasing each roller section towards the print drum.
- Fig. 6 showing a plan view of suchlike arrangement.
- the roller sections can be made from a suitable plastic.
- Fig. 7 shows an example of the image on a thermal-sensitive sheet in accordance with the invention, printed with the thermal printer disclosed in EP-A-0 846 565.
- Poly(ethylene terephthalate) sheet 45 has a transparent circumferential margin 46 with a width a' .
- the leading end of the sheet bears a black band 47 with a width a .
- the bodily displacement of the pressure means may occur by other mechanisms known in the art.
- the pressure means may comprise a second roller, or combination of roller sections, which is located angularly (with respect to the print drum) after a first pressure roller so as to obtain a larger angle of wrapping of the sheet about the print drum.
- Such second roller(s) can be moved simultaneously with, or with a small delay with respect to, the first pressure roller.
- the sheet advance over distance a before the pressure means are closed may be smaller than 10 mm and may suitably start up from 5 mm.
- the feeding of a sheet taken from a stack of sheets into the gap between print drum and thermal head can occur in various ways.
- a particularly interesting mechanism for obtaining this result is one based on the use of gravity to let a sheet, which has been forwarded upwardly beyond its intended position, fall back with its trailing edge on a reference stop, adjustable as the case may be.
- This arrangement provides under all circumstances a reliable sheet positioning, and is disclosed in patent application EP-A-0 855 284 entitled: "Thermal printer with sheet feeding means".
- This arrangement may occasionally comprise additional sheet driving rollers such as 49, see Fig.1, for moving a sheet slighly backwardly.
- a sheet pack which is particularly suited for loading a stack of sheets in a tilted position as shown in Fig.1, without risk for the stack of sheets to become disturbed as it is put in the magazine of the printer, is disclosed in patent application EP-A-0 846 564 entitled: "A pack of non light-sensitive sheets”.
Landscapes
- Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Electronic Switches (AREA)
- Handling Of Cut Paper (AREA)
- Common Mechanisms (AREA)
Claims (4)
- Wärmeempfindlicher Film (45) mit einem Röntgenbild, wobei der Film über seinem ganzen Umfang einen lichtdurchlässigen unbedruckten Rand (46) aufweist, dadurch gekennzeichnet, dass der Umfangsrand (46) eine gleichmäßige Breite (a') der Größenordnung von 5 mm aufweist, so dass der Film (45) bei Betrachtung auf einem Betrachtungsgerät keinen verblendenden Effekt hervorruft.
- Wärmeempfindlicher Film (45) nach Anspruch 1, dadurch gekennzeichnet, dass das Bild eine Seitenkante mit einem Band (47) mit hoher optischer Dichte aufweist.
- Wärmeempfindlicher Film (45) nach Anspruch 2, dadurch gekennzeichnet, dass das Band (47) eine optische Dichte von etwa 3,0 aufweist.
- Wärmeempfindlicher Film (45) nach Anspruch 2 oder 3, dadurch gekennzeichnet, dass das Band (47) Kennzeichnungsdaten in Form von Merkzeichen mit beschränkter optischer Dichte enthält.
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP01000013A EP1170140B1 (de) | 1996-11-28 | 1996-11-28 | Wärmeempfindliches Aufzeichnungsmaterial mit einem uniformen Filmrand |
DE69634643T DE69634643T2 (de) | 1996-11-28 | 1996-11-28 | Wärmeempfindliches Aufzeichnungsmaterial mit einem uniformen Filmrand |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP01000013A EP1170140B1 (de) | 1996-11-28 | 1996-11-28 | Wärmeempfindliches Aufzeichnungsmaterial mit einem uniformen Filmrand |
EP19960203361 EP0846565B1 (de) | 1996-11-28 | 1996-11-28 | Thermodrucker mit Blattandruckmittel |
Related Parent Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP96203361.9 Division | 1996-11-28 | ||
EP19960203361 Division EP0846565B1 (de) | 1996-11-28 | 1996-11-28 | Thermodrucker mit Blattandruckmittel |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1170140A1 EP1170140A1 (de) | 2002-01-09 |
EP1170140B1 true EP1170140B1 (de) | 2005-04-20 |
Family
ID=8224636
Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP01000013A Expired - Lifetime EP1170140B1 (de) | 1996-11-28 | 1996-11-28 | Wärmeempfindliches Aufzeichnungsmaterial mit einem uniformen Filmrand |
EP19960203361 Expired - Lifetime EP0846565B1 (de) | 1996-11-28 | 1996-11-28 | Thermodrucker mit Blattandruckmittel |
Family Applications After (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP19960203361 Expired - Lifetime EP0846565B1 (de) | 1996-11-28 | 1996-11-28 | Thermodrucker mit Blattandruckmittel |
Country Status (3)
Country | Link |
---|---|
EP (2) | EP1170140B1 (de) |
JP (1) | JPH10157228A (de) |
DE (1) | DE69616570T2 (de) |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE69616570T2 (de) | 1996-11-28 | 2002-06-27 | Agfa Gevaert Nv | Thermodrucker mit Blattandruckmittel |
US6666451B2 (en) | 2001-09-03 | 2003-12-23 | Agfa-Gevaert | Method and device for aligning sheets |
DE60109604T2 (de) * | 2001-09-03 | 2006-02-02 | Agfa-Gevaert | Methode und Vorrichtung zum Ausrichten von Blättern nach einer Kante |
DE60223349T2 (de) * | 2002-07-02 | 2008-08-28 | Agfa Healthcare Nv | Thermodruckverfahren |
US6972781B2 (en) | 2002-07-02 | 2005-12-06 | Agfa Gevaert N.V. | Thermal printing method |
CN113352780A (zh) * | 2021-06-18 | 2021-09-07 | 天津开发区精诺瀚海数据科技有限公司 | 一种面向快速转产的多方位轮毂打码装置 |
Family Cites Families (14)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS60131278A (ja) * | 1983-12-20 | 1985-07-12 | Nippon Digital Kenkyusho:Kk | 単票用紙の自動給紙時におけるプレスロ−ラの自動開閉機構 |
JPS60179276A (ja) * | 1984-02-10 | 1985-09-13 | Fujitsu Ltd | プリンタの用紙装着装置 |
US4996537A (en) * | 1988-08-31 | 1991-02-26 | Fuji Photo Film Co., Ltd. | Method of and apparatus for recording image |
DE3943227A1 (de) * | 1989-12-22 | 1991-07-04 | Mannesmann Ag | Vorrichtung fuer den transport von einzelblaettern oder papierbahnen wechselnder bzw. unterschiedlicher breite und/oder dicke |
US5214519A (en) * | 1991-04-29 | 1993-05-25 | E. I. Du Pont De Nemours And Company | Method and apparatus for producing a specified format output image from an arbitrary format source image |
US5363129A (en) * | 1991-10-31 | 1994-11-08 | Hewlett-Packard Company | Printing media feed and retaining apparatus for a thermal ink jet printer/plotter |
JPH068549A (ja) * | 1992-06-25 | 1994-01-18 | Sony Corp | ビデオプリンター |
EP0669875B1 (de) | 1992-11-16 | 1996-04-24 | Agfa-Gevaert N.V. | Wärmeempfindliches aufzeichnungsmaterial |
EP0669876B1 (de) | 1992-11-16 | 1996-04-24 | Agfa-Gevaert N.V. | Wärmeempfindliches aufzeichnungsmaterial |
US5710095A (en) | 1993-11-06 | 1998-01-20 | Agfa-Gevaert | Direct thermal imaging method using a protected heat-sensitive recording material |
EP0679519A3 (de) | 1994-04-29 | 1997-11-05 | Agfa-Gevaert N.V. | Thermisches Farbstoffübertragungsdruckverfahren |
JP3015281B2 (ja) * | 1994-07-04 | 2000-03-06 | キヤノン株式会社 | 画像形成装置 |
EP0694867A1 (de) * | 1994-07-21 | 1996-01-31 | Agfa-Gevaert N.V. | Verfahren zum Drucken eines elektronisch gespeicherten mehrfarbigen medizinischen Bildes |
DE69616570T2 (de) | 1996-11-28 | 2002-06-27 | Agfa Gevaert Nv | Thermodrucker mit Blattandruckmittel |
-
1996
- 1996-11-28 DE DE1996616570 patent/DE69616570T2/de not_active Expired - Fee Related
- 1996-11-28 EP EP01000013A patent/EP1170140B1/de not_active Expired - Lifetime
- 1996-11-28 EP EP19960203361 patent/EP0846565B1/de not_active Expired - Lifetime
-
1997
- 1997-11-27 JP JP34434997A patent/JPH10157228A/ja active Pending
Also Published As
Publication number | Publication date |
---|---|
EP0846565A1 (de) | 1998-06-10 |
EP1170140A1 (de) | 2002-01-09 |
EP0846565B1 (de) | 2001-10-31 |
DE69616570D1 (de) | 2001-12-06 |
DE69616570T2 (de) | 2002-06-27 |
JPH10157228A (ja) | 1998-06-16 |
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