Seal carving apparatus and seal carving method
AssigneeShachihata Inc.
InventorsEiji Abe, Masayoshi Uchida
Life of this patent
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Abstract
A seal carving apparatus includes a thermal head having a plurality of heat generating elements disposed in lines, and thermal drive control means that performs a control process of selectively and thermally driving the individual heat generating elements while moving the thermal head and a porous material in relative to each other with the thermal head being in abutment with the porous material, thereby forming a seal face on the porous material. The thermal drive control means controls a pulse time width for thermally driving the individual heat generating elements of the thermal head under pulse width modulation control based on gradation image data having a gradation value, thereby forming a seal with a gradation on the porous material.
Claims6
A seal carving apparatus including a thermal head having a plurality of individual heat generating elements disposed in lines, loading means that moves the thermal head and a porous material in relative to each other with the thermal head being in abutment with the porous material, and thermal drive control means that performs a control process of selectively and thermally driving the individual heat generating elements line by line while making the relative movement to carry out melt-solidification of the porous material, thereby forming a seal,
- wherein the thermal drive control means performs pulse width modulation control on a pulse time width for thermally driving the individual heat generating elements based on gradation image data having a gradation value to form the seal on the porous material, and
- wherein the thermal drive control means performs pulse width modulation control on driving amounts of the individual heat generating elements with a duty ratio of the pulse time width for a period of a modulation base signal which differs from a period of a carving period signal for forming one line of the seal.
A porous stamp produced using a seal carving apparatus including a thermal head having a plurality of individual heat generating elements disposed in lines, and control means that performs a control process of selectively and thermally driving the individual heat generating elements while moving the thermal head and a porous material in relative to each other with the thermal head being in abutment with the porous material, thereby forming a seal on the porous material, wherein
- based on monochromatic image data representing a given seal pattern, the control means prepares gradation image data corrected in such a way that a pixel value monotonously changes stepwise in a boundary region where a value of the monochromatic image data is inverted, and
- the control means thermally drives the individual heat generating elements by a driving amount based on the gradation image data, thereby forming a seal with a gradation on the porous stamp.
Dependencies are inferred from the claim text.