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US 5,019,486 AGranted
Method for forming plate characters in a half-tone gravure platemaking process
AssigneeThink Laboratory Co., Ltd.
InventorKoichi Takakura
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AssigneeThink Laboratory Co., Ltd.
InventorKoichi Takakura
Estimating the term…
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.
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:
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:
Dependencies are inferred from the claim text.