US Patent No: 6,168,903
Number of patents in Portfolio can not be more than 2000
Lithographic imaging with reduced power requirements
Stats
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Jan 2, 2001
Issued date -
Jan 21, 1999
filing date -
09/245,103
serial no -
In Force
status
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Abstract
Imaging of lithographic printing plates with reduced fluence requirements is accomplished using printing members that have a solid substrate, gas-producing and radiation-absorptive layers over the substrate, and a topmost layer that contrasts with the substrate in terms of lithographic affinity. Exposure of the radiation-absorptive layer to laser light causes this layer to become intensely hot. This, in turn, activates the gas-producing layer, causing rapid evolution and expansion of gaseous decomposition products. The gases stretch the overlying topmost layer to create a bubble over the exposure region, where the imaging layers have been destroyed. If this process is sufficiently explosive, the neck of the bubble expands beyond the diameter of the incident laser beam, tearing the topmost layer and the underlying imaging layers away from the substrate outside the exposed region. The entire affected area is easily removed during a post-imaging cleaning process, resulting in an image spot larger than the incident beam diameter.
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First Claim
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International Classification(s)
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Cited Art
| Patent Info | (Count) | # Cites | Year |
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| 5,339,737 Lithographic printing plates for use with laser-discharge imaging apparatus | 131 | 1993 | |
| 5,353,705 Lithographic printing members having secondary ablation layers for use with laser-discharge imaging apparatus | 68 | 1993 | |
| 5,819,661 Method and apparatus for laser imaging of lithographic printing members by thermal non-ablative transfer | 28 | 1995 | |
| 5,704,291 Lithographic printing members with deformable cushioning layers | 18 | 1996 | |
| 5,822,345 Diode-pumped laser system and method | 15 | 1996 | |
| 5,783,364 Thin-film imaging recording constructions incorporating metallic inorganic layers and optical interference structures | 19 | 1996 | |
| 5,786,129 Laser-imageable recording constructions utilizing controlled, self-propagating exothermic chemical reaction mechanisms | 24 | 1997 | |
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| 5,308,737 Laser propulsion transfer using black metal coated substrates | 99 | 1993 | |
| 5,756,689 Diazo compounds for laser-induced mass transfer imaging materials | 10 | 1997 | |
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| 5,506,085 Thermal imaging element | 11 | 1995 | |
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| 4,588,674 Laser imaging materials comprising carbon black in overlayer | 62 | 1983 | |
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| 5,395,729 Laser-induced thermal transfer process | 36 | 1993 | |
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| 5,156,938 Ablation-transfer imaging/recording | 186 | 1991 | |
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| 4,711,834 Laser-imageable assembly and process for production thereof | 38 | 1985 | |
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| 5,238,778 Method of forming printing plates by heat transfer | 42 | 1991 | |
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| 5,460,918 Thermal transfer donor and receptor with silicated surface for lithographic printing applications | 23 | 1994 | |
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| 5,171,650 Ablation-transfer imaging/recording | 210 | 1991 | |