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US5019486A
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Method for forming plate characters in a half-tone gravure platemaking process
Assignee: Think Laboratory Co Ltd
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Filing: 1990-02-08
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Granted: 1991-05-28
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Expires: 2010-02-08
Abstract
Abstract A method for forming plate characters in a half-tone gravure platemaking process in which a laser beam intermittently irradiates a photosensitive material, thus forming plate characters therein as a result of exposure by the laser beam. The outline portion of each character is made up of continuous groove-form cells and inner portion of the character (the filled portion) is made up of independent dot-form cells corresponding to the dot percentage of a shadow portion or with island-form projections to the extent that ink flow (running) does not occur when the cells are filled with ink as a result of the plate surface being wiped by a doctor blade. The outline portion of each character is made up of groove-form cells having a narrow width without causing ink flow (running) when the cells are filled with ink as a result of the plate surface being wiped by a doctor blade.
Inventors
- 👤 Koichi Takakura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 15:46
CPC Classifications
B; B41; B41C; B41C1/00; B41C1/02; B41C1/04; B41C1/05; B41B; B41B17/00; G; G03; G03F; G03F1/00; G03F5/00; G03F5/20
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
129 words
A method for forming plate characters in a half-tone gravure platemaking process, characterized in that a laser beam of a laser exposure apparatus is moved so that said laser beam irradiates a photosensitive material in spots, thus forming plate characters on said photosensitive material, each plate character being formed so that: an outline of each character is formed of continuous groove-shaped cells; an area inside said outline of said character is formed of independent dot-shaped cells which correspond to a dot percentage of a shadow portion; and said groove-shaped cells of said outline portion of each character have as narrow a width as possible without causing ink flow when said groove-shaped cells are filled with ink as a result of a plate surface being wiped by a doctor blade.
Claim 2
Independent Claim
129 words
A method for forming plate characters in a half-tone gravure platemaking process, characterized in that a laser beam of a laser exposure apparatus is moved so that said laser beam irradiates a photosensitive material in spots, thus forming plate characters on said photosensitive material, each plate character being formed so that: an outline of each character is formed of continuous groove-shaped cells; an area inside said outline of said character is formed of independent dot-shaped cells which correspond to a dot percentage of a shadow portion; and said groove-shaped cells of said outline portion of each character have as narrow a width as possible without causing ink flow when said groove-shaped cells are filled with ink as a result of a plate surface being wiped by a doctor blade.
Claim 3
Independent Claim
149 words
A method for forming plate characters in a half-tone gravure platemaking process, characterized in that a laser beam of a laser exposure apparatus is moved so that said laser beam irradiates a photosensitive material in spots, thus forming plate characters on said photosensitive material, each plate character being formed so that: an outline of each character is formed of continuous groove-shaped cells; an area inside said outline of said character is formed of independent island-shaped cells to an extent that ink flow does not occur when said island-shaped cells are filled with ink as a result of the plate surface being wiped by a doctor blade and, said groove-shaped cells of said outline portion of each character have as narrow a width as possible without causing ink flow when said groove-shaped cells are filled with ink as a result of the plate surface being wiped by a doctor blade.
Claim 4
Independent Claim
149 words
A method for forming plate characters in a half-tone gravure platemaking process, characterized in that a laser beam of a laser exposure apparatus is moved so that said laser beam irradiates a photosensitive material in spots, thus forming plate characters on said photosensitive material, each plate character being formed so that: an outline of each character is formed of continuous groove-shaped cells; an area inside said outline of said character is formed of independent island-shaped cells to an extent that ink flow does not occur when said island-shaped cells are filled with ink as a result of the plate surface being wiped by a doctor blade and, said groove-shaped cells of said outline portion of each character have as narrow a width as possible without causing ink flow when said groove-shaped cells are filled with ink as a result of the plate surface being wiped by a doctor blade.
References Cited (Backward Citations)
US3980018A
Cited
US3804622A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-05-27 | 1994-11-26 | 1995-05-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-05-27 | 1998-11-26 | 1999-05-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-05-27 | 2002-11-26 | 2003-05-28 | $7700.00 | Window Closed / Lapsed |