CA2446880A1 - Thermal imaging system - Google Patents

Thermal imaging system Download PDF

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Publication number
CA2446880A1
CA2446880A1 CA002446880A CA2446880A CA2446880A1 CA 2446880 A1 CA2446880 A1 CA 2446880A1 CA 002446880 A CA002446880 A CA 002446880A CA 2446880 A CA2446880 A CA 2446880A CA 2446880 A1 CA2446880 A1 CA 2446880A1
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CA
Canada
Prior art keywords
image
thermal imaging
forming layer
forming
layer
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
CA002446880A
Other languages
French (fr)
Other versions
CA2446880C (en
Inventor
Jayprakash C. Bhatt
Brian D. Busch
Daniel P. Bybell
F. Richard Cottrell
Anemarie Deyoung
Chien Liu
Stephen J. Telfer
Jay E. Thornton
William T. Vetterling
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.)
Zink Imaging LLC
Original Assignee
Polaroid Corporation
Jayprakash C. Bhatt
Brian D. Busch
Daniel P. Bybell
F. Richard Cottrell
Anemarie Deyoung
Chien Liu
Stephen J. Telfer
Jay E. Thornton
William T. Vetterling
Zink Imaging, Llc
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 Polaroid Corporation, Jayprakash C. Bhatt, Brian D. Busch, Daniel P. Bybell, F. Richard Cottrell, Anemarie Deyoung, Chien Liu, Stephen J. Telfer, Jay E. Thornton, William T. Vetterling, Zink Imaging, Llc filed Critical Polaroid Corporation
Publication of CA2446880A1 publication Critical patent/CA2446880A1/en
Application granted granted Critical
Publication of CA2446880C publication Critical patent/CA2446880C/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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Classifications

    • 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
    • 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
    • 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
    • B41J2/35—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 providing current or voltage to the thermal head
    • B41J2/355—Control circuits for heating-element selection
    • B41J2/36—Print density control
    • 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
    • B41M5/34—Multicolour thermography
    • 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
    • B41M5/40—Thermography ; Marking by high energetic means, e.g. laser otherwise than by burning, and characterised by the material used characterised by the base backcoat, intermediate, or covering layers, e.g. for thermal transfer dye-donor or dye-receiver sheets; Heat, radiation filtering or absorbing means or layers; combined with other image registration layers or compositions; Special originals for reproduction by thermography
    • 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
    • B41M5/40—Thermography ; Marking by high energetic means, e.g. laser otherwise than by burning, and characterised by the material used characterised by the base backcoat, intermediate, or covering layers, e.g. for thermal transfer dye-donor or dye-receiver sheets; Heat, radiation filtering or absorbing means or layers; combined with other image registration layers or compositions; Special originals for reproduction by thermography
    • B41M5/42—Intermediate, backcoat, or covering layers
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03C—PHOTOSENSITIVE MATERIALS FOR PHOTOGRAPHIC PURPOSES; PHOTOGRAPHIC PROCESSES, e.g. CINE, X-RAY, COLOUR, STEREO-PHOTOGRAPHIC PROCESSES; AUXILIARY PROCESSES IN PHOTOGRAPHY
    • G03C1/00—Photosensitive materials
    • G03C1/52—Compositions containing diazo compounds as photosensitive substances
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M2205/00—Printing methods or features related to printing methods; Location or type of the layers
    • B41M2205/04—Direct thermal recording [DTR]
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M2205/00—Printing methods or features related to printing methods; Location or type of the layers
    • B41M2205/38—Intermediate layers; Layers between substrate and imaging layer
    • 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
    • B41M5/30—Thermography ; Marking by high energetic means, e.g. laser otherwise than by burning, and characterised by the material used using chemical colour formers
    • B41M5/323—Organic colour formers, e.g. leuco dyes
    • B41M5/327—Organic colour formers, e.g. leuco dyes with a lactone or lactam ring
    • B41M5/3275—Fluoran compounds
    • 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
    • B41M5/30—Thermography ; Marking by high energetic means, e.g. laser otherwise than by burning, and characterised by the material used using chemical colour formers
    • B41M5/333—Colour developing components therefor, e.g. acidic compounds
    • B41M5/3333—Non-macromolecular compounds
    • B41M5/3335—Compounds containing phenolic or carboxylic acid groups or metal salts thereof
    • 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
    • B41M5/30—Thermography ; Marking by high energetic means, e.g. laser otherwise than by burning, and characterised by the material used using chemical colour formers
    • B41M5/333—Colour developing components therefor, e.g. acidic compounds
    • B41M5/3333—Non-macromolecular compounds
    • B41M5/3335—Compounds containing phenolic or carboxylic acid groups or metal salts thereof
    • B41M5/3336—Sulfur compounds, e.g. sulfones, sulfides, sulfonamides
    • 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
    • B41M5/40—Thermography ; Marking by high energetic means, e.g. laser otherwise than by burning, and characterised by the material used characterised by the base backcoat, intermediate, or covering layers, e.g. for thermal transfer dye-donor or dye-receiver sheets; Heat, radiation filtering or absorbing means or layers; combined with other image registration layers or compositions; Special originals for reproduction by thermography
    • B41M5/42—Intermediate, backcoat, or covering layers
    • B41M5/426—Intermediate, backcoat, or covering layers characterised by inorganic compounds, e.g. metals, metal salts, metal complexes
    • 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
    • B41M5/40—Thermography ; Marking by high energetic means, e.g. laser otherwise than by burning, and characterised by the material used characterised by the base backcoat, intermediate, or covering layers, e.g. for thermal transfer dye-donor or dye-receiver sheets; Heat, radiation filtering or absorbing means or layers; combined with other image registration layers or compositions; Special originals for reproduction by thermography
    • B41M5/42—Intermediate, backcoat, or covering layers
    • B41M5/44—Intermediate, backcoat, or covering layers characterised by the macromolecular compounds

Abstract

A multicolor imaging system is described wherein at least two, and preferabl y three, different image-forming layers of a thermal imaging member are addressed at least partially independantly by a thermal printhead or printheads from the same surface of the imaging member by controlling the temperature of the thermal printhead(s) and the time thermal energy is appli ed to the image-forming layers. Each color of the thermal imaging member can be printed alone or in selectable proportion to the other color(s). Novel therm al imaging members are also described.

Claims (56)

1. A multicolor thermal imaging method comprising (a) addressing at least partially independently a first image-forming layer of a thermal imaging member, which includes at least two different image-forming layers, from a surface of said imaging member with a thermal printhead or printheads configured to form an image in said first image-forming layer by controlling the temperature of said thermal printhead or printheads configured to form an image in said first imsge-forming layer and the time interval during which thermal energy is applied to said first image-forming layer;

(b) addressing at Least partially independently a second image-forming Layer of said imaging member from the same surface of said imaging member with a thermal printhead or printheads configured to form an image in said second image-forming layer by controlling the temperature of said thermal printhead or printheads configured to form an image in said second image-forming layer and the time interval during which thermal energy is applied to said second image-forming layer.
2. The multicolor thermal imaging method as defined in claim 1 wherein said first and second image-forming layers are addressed by the same thermal printhead.
3. The multicolor thermal imaging method as defined in claim 1 wherein said first and second image-forming layers are addressed by different thermal printheads.
4. The multicolor thermal imaging method as defined in claim 1 wherein said first and second image-forming layers are addressed substantially independently.
5. The multicolor thermal imaging method as defined in claim 1 wherein said first and second image-forming layers are addressed independently.
6. The multicolor thermal imaging method as defined in claim 1 wherein said first and second image-forming layers are addressed by the same thermal printhead in a single pass of the printhead.
7. The multicolor thermal imaging method as defined in claim 1 wherein said thermal imaging member further includes a substrate having first and second opposed surfaces and said first and second image-forming layers are carried by the same surface of said substrate.
8. The multicolor thermal imaging method as defined in claim 1 wherein said thermal imaging member further includes a substrate having first and second opposed surfaces and at least one of said image-forming layers is carried by said first surface of said substrate and at least another of said image-forming layers is carried by said second surface of said substrate.
9. The multicolor thermal imaging method as defined in claim 1 wherein said thermal imaging member includes a third different image-forming layer and further including the step of (c) addressing at least partially independently said third image-forming layer with a thermal printhead or printheads configured to form an image in said third image-forming layer by controlling the temperature of said thermal printhead or printheads configured to form an image in said third image-forming layer and the time interval during which thermal energy is applied to said third image-forming layer.
10. The multicolor thermal imaging method as defined in claim 9 wherein said imaging member further includes a substrate having first and second opposed surfaces and said first and second image-forming layers are carried by said first surface of said substrate and said third image-forming layer is carried by said second surface of said substrate.
11.. The multicolor thermal imaging method as defined in claim 10 wherein said first and second image-forming layers are addressed by at least a first thermal printhead from the same surface of said imaging member and said third image-forming layer is addressed by at least a second thermal printhead from the opposing surface of said imaging member.
12. The multicolor thermal imaging method as defined in claim 9 wherein said imaging member further includes a substrate and said first, second and third image-forming layers are carried by the same surface of said substrate.
13. The multicolor thermal imaging method as defined in claim 12 wherein said first, second and third image-forming layers axe addressed by the same thermal printhead in a single pass of the printhead.
14. The multicolor thermal imaging method as defined in claim 13 wherein the activation temperature of said third image-forming layer is higher than the activation temperature of said second image-forming layer and the activation temperature of said second image-forming layer is higher than the activation temperature of said first image-forming layer.
15. The multicolor thermal imaging method as defined in claim 1 wherein at least one of said first and second image-forming layers comprises a leuco dye in combination with a developer.
16. The multicolor thermal imaging method as defined in claim 1 wherein at least one of said image-forming layers comprises a compound which forms color intramolecularly.
17. The multicolor thermal imaging method as defined in claim 1 wherein thermal energy is applied to said image-forming layers at a temperature of from about 50°C to about 450°C for a period of from about 0.01 to about 100 milliseconds.
18. The multicolor thermal imaging method as defined in claim 1 wherein at least one of said image-forming layers further includes a thermal solvent.
19. The multicolor thermal imaging method as defined in claim 18 wherein a plurality of said image-forming layers each include a thermal solvent and each thermal solvent has a different melting point.
20. The multicolor thermal imaging method as defined in claim 1 wherein at least one of said image-forming layers is initially substantially colorless and a colored image is formed therein.
21. The multicolor thermal imaging method as defined in claim 1 wherein at least one of said image-forming layers is initially colored and a less colored image is formed therein.
22. The multicolor thermal imaging method as defined in claim 1 wherein at least one of said image-forming layers is initially a first color and an image of a second color is formed therein.
23. The multicolor thermal imaging method as defined in claim 1 wherein the thermal energy applied to each said image-forming layer is controlled by supplying one or more pulses of electrical current to at least one heating element of said printhead or printheads configured to form an image in said image-forming layer during the time interval for forming a pixel of an image in the area of said image-forming layer in thermal contact with said heating element.
24. The multicolor thermal imaging method as defined in claim 1 wherein the thermal energy applied to said first image-forming layer by at least one of said printhead or printheads configured to form an image in said first image-forming layer is controlled by a first voltage applied to at least one of said printhead or printheads when forming an image in said first image-forming layer and the thermal energy applied to said second image-forming layer by at least one of said printhead or printheads configured to form an image in said second image-forming layer is controlled by a second voltage applied to at least one of said printhead or printheads when forming an image in said second image-forming layer, said first and second voltages being different.
25. The multicolor thermal imaging method as defined in claim 1 wherein the thermal energy applied to said first image-forming layer by at least one of said printhead or printheads configured to form an image in said first image-forming layer is controlled by a first voltage applied to at least one of said printhead or printheads when forming an image in said first image-forming layer and the thermal energy applied to said second image-forming layer by at least one of said printhead or printheads configured to form an image in said second image-forming layer is controlled by a second voltage applied to at least one of said printhead or printheads when forming an image in said second image-forming layer, said first and second voltages being substantially the same.
26. The multicolor thermal imaging method as defined in claim 1 wherein the thermal energy applied to at least one of said image-forming layers is controlled by separating the time interval for forming a single pixel of an image in an area of said image-forming layer in thermal contact with a heating element of said thermal printhead or printheads configured to form an image in said image-forming layer into a plurality of temporal subintervals; and activating said heating element by applying a single pulse of current during each of a group temporal sub-intervals selected from said plurality of temporal sub-intervals, wherein the proportion of the duration of said temporal sub-intervals during which said pulse of current is applied is a value between about 1% and 100%.
27. The multicolor thermal imaging method as defined in claim 26 further comprising the steps:
separating the time interval for forming a single pixel of an image in an area of said image forming layer in thermal contact with a heating element of said thermal printhead or printheads into first and second time intervals, said first time interval being shorter than said second time interval;
wherein said proportion of the duration of said temporal subintervals during which said pulse of current is applied is fixed at a substantially constant value, p1, during said first time interval and a substantially constant value, p2, during said second time interval, where p1 > p2.
28. The multicolor thermal imaging method as defined in claim 27 wherein said second time interval is at least two times as long as said first time interval.
29. The multicolor thermal imaging method as defined in claim 27 wherein p1 is at least two times greater than p2.
30. The multicolor thermal imaging method as defined in claim 26 further comprising the steps:

separating the time interval for forming a single pixel of an image in an area of said image forming layer in thermal contact with a heating element of said thermal printhead or printheads into first, second and third time intervals, said first time interval being shorter than said second time interval and said second time interval being shorter than said third time interval;
wherein said proportion of the duration of said temporal subintervals during which said pulse of current is fixed at a substantially constant value, p1, during said first time interval, a substantially constant value, p2, during said second time interval and a substantially constant value, p3 during said third time interval, where p1 > p2 > p3.
31. The multicolor thermal imaging method as defined in any one of claims 26 - 30 wherein the voltage applied to said printhead or printheads is maintained at a substantially constant value.
32. The multicolor thermal imaging method as defined in any one of claims 26 - 30 wherein each temporal subinterval of said plurality of subintervals is of substantially equal duration.
33. The multicolor thermal imaging method as defined in any one claims 26 - 30 wherein each temporal subinterval of said plurality of subintervals is of substantially equal duration and the voltage applied to said printhead or printheads is maintained at a substantially constant value.
34. The multicolor thermal imaging method as defined in claim 1 wherein the activation temperature of said second image-forming layer is higher than the activation temperature of said first image-forming layer.
35. A thermal imaging member comprising (a) a substrate having first and second opposed surfaces;
(b) first and second image-forming layers carried by said first surface of said substrate, said first image-forming layer being closer to said first surface of said substrate than said second image-forming layer, said first image-forming layer having a lower activation temperature than said second image-forming layer;
and (c) a first interlayer positioned between said first and second image-forming layers.
36. The thermal imaging member as defined in claim 35 wherein said interlayer comprises an inert material.
37. The thermal imaging member as defined in claim 35 wherein said interlayer includes a material which undergoes a phase change upon the application of heat thereto.
38. The thermal imaging member as defined in claim 35 wherein said first and second image-forming layers each has a thickness of from about 0.5 to about 4.0 µm.
39. The thermal imaging member as defined in claim 35 wherein at least one of said first and second image-forming layers has a thickness of about 2 µm.
40. The thermal imaging member as defined in claim 35 wherein said first interlayer has a thickness of from about 1 to about 40 µm.
41. The thermal imaging member as defined in claim 35 wherein said first interlayer has a thickness of from about 14 to about 25 µm.
42. The thermal imaging member as defined in claim 35 and further including:
(a) a third image-forming layer carried by said first surface of said substrate, said third image-forming layer being farther from said first surface of said substrate than said second image-forming layer and having a higher activation temperature than said second image-forming layer; and (b) a second interlayer positioned between said second and third image-forming layers.
43 The thermal imaging member as defined in claim 42 wherein said second interlayer is thinner than said first interlayer.
44. The thermal imaging member as defined in claim 42 wherein said first image-forming layer has a thickness of from about 0.5 to about 4 µm and comprises a leuco dye and a developer material, each having a melting point of from about 90°C to about 140°C , said second image-forming layer has a thickness of from about 0.5 to about 4 µm and comprises a leuco dye and a developer, each having a melting point of from about 150°C to about 250°C, said third image -forming layer having a thickness of from about 0.5 to about 4 µm and comprising a leuco dye having a melting point of at least 150°C and a developer having a melting point of at least 250°C.
45 The thermal imaging member as defined in claim 42 wherein said first image-forming layer has a thickness of from about 0.5 to about 4 µm and comprises a leuco dye and a developer material, each having a melting point of from about 90°C to about 140°C , said second image-forming layer has a thickness of from about 0.5 to about 4 µm and comprises a leuco dye and a developer, each having a melting point of from about 150°C to about 250°C, said third image -forming layer having a thickness of from about 0.5 to about 4 µm and comprising a compound which forms color intramolecularly at a temperature of at least 300°C in from about 0.1 to about 2 milliseconds.
46. The thermal imaging member as defined in claim 35 and further including a topcoat layer and a backcoat layer.
47. The thermal imaging member as defined in claim 46 and further including (c) a third image-forming layer carried by said second surface of said substrate.
48. The thermal imaging member as defined in claim 47 wherein said substrate is transparent and further including a reflective layer adjacent the surface of said third image-forming layer remote from said second surface of said substrate.
49. The thermal imaging member as defined in claim 35 wherein the thickness of said substrate is less than about 20µm.
50. The thermal imaging member as defined in claim 35 wherein said substrate has a thickness of about 5 µm.
51. A thermal imaging member comprising in succession:
a first image-forming layer, a first timing layer, a layer of a fixing material, a second timing layer and a second image-forming layer.
52. The thermal imaging member as defined in claim 51 wherein said first image-forming layer comprises a layer of a first leuco dye in combination with a layer of an acid developer material having a melting point T7, said second image-forming layer comprises a layer of a second leuco dye in combination with a layer of an acid developer material having a melting point T8, said fixing material has a melting point T9 and T7 < T8 and T9 < T7 and T8.
53. The thermal imaging member as defined in claim 52 wherein said first timing layer is thinner than said second timing layer.
54. The thermal imaging member as defined in claim 52 and further including a third image-forming layer comprising a layer of a third leuco dye in combination with a layer of an acid developer material having a melting point T10, where T10 > T7 and T8.
55. The thermal imaging member as defined in claim 54 wherein said first timing layer is thinner than said second timing layer.
56. A thermal imaging member comprising in succession:
a first layer of a decolorizer material, a first image-forming layer, a first timing layer, a layer of a fixing material, a second timing layer, a second image-forming layer and a second layer of a decolorizer material.
CA2446880A 2001-05-30 2002-05-20 Thermal imaging system Expired - Fee Related CA2446880C (en)

Applications Claiming Priority (7)

Application Number Priority Date Filing Date Title
US29448601P 2001-05-30 2001-05-30
US60/294,486 2001-05-30
US36419802P 2002-03-13 2002-03-13
US60/364,198 2002-03-13
US10/151,432 US6801233B2 (en) 2001-05-30 2002-05-20 Thermal imaging system
PCT/US2002/015868 WO2002096665A1 (en) 2001-05-30 2002-05-20 Thermal imaging system
US10/151,432 2002-05-20

Publications (2)

Publication Number Publication Date
CA2446880A1 true CA2446880A1 (en) 2002-12-05
CA2446880C CA2446880C (en) 2010-08-03

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Application Number Title Priority Date Filing Date
CA2446880A Expired - Fee Related CA2446880C (en) 2001-05-30 2002-05-20 Thermal imaging system

Country Status (10)

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US (4) US6801233B2 (en)
EP (1) EP1399318B1 (en)
JP (6) JP2004530576A (en)
KR (1) KR100632157B1 (en)
CN (1) CN100354136C (en)
AT (1) ATE353770T1 (en)
CA (1) CA2446880C (en)
DE (1) DE60218158T2 (en)
EA (2) EA008721B1 (en)
WO (1) WO2002096665A1 (en)

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