Stamp-face platemaking device, medium holder, and medium holder manufacturing method

A stamp-face platemaking device capable of performing platemaking of a stamp face on stamp face materials of various sizes, the stamp-face platemaking device comprising:

• a plate insertion portion;
• a single sensor configured to detect at least two positions from among:
• a position of a top end portion of a medium holder on a sensor scanning line in an inserting direction, a position of one pattern end portion of a printing pattern printed on the medium holder on the sensor scanning line, and a position of the other pattern end portion of the printing pattern printed on the medium holder on the sensor scanning line, when the medium holder is inserted into the plate insertion portion, wherein the medium holder includes:
• a stamp face material capable of being made nonporous by being heated, and a holding unit configured to hold the stamp face material and provided with, at a side end portion thereof, the printing pattern that varies in accordance with a size of the held stamp face material;
• a processor configured to set the size of the held stamp face material based on a distance between at least two of the positions detected by the sensor;
• a platemaking unit configured to perform platemaking of the stamp face by heating the held stamp face material within the size of the stamp face material set by the processor;
• and
• a memory configured to store an image for platemaking;
• wherein the processor is configured to read the image for platemaking from the memory, and to determine whether a size of the image for platemaking is the same size as the set size of the stamp face material;
• and
• wherein the processor is configured to conduct the platemaking on the stamp face material when the size of the image for platemaking is determined to be the same size as the set size of the stamp face material, and the processor is configured not to conduct the platemaking on the stamp face material and to notify of a size mismatch when the size of the image for platemaking is determined not to be the same size as the set size of the stamp face material.