Stamp unit and method of preparing stamp unit

A stamp unit including a base material for stamp face formation using a liquid photosensitive resin which changes from a liquid to a solid upon receiving rays of light, said stamp unit comprising:

• a stamp stock;
• a liquid resin encapsulating section provided on a stamp face formation side of the stamp stock serving to encapsulate the liquid photosensitive resin in an exposable state;
• the liquid resin encapsulating section including an encapsulation front-plate member covering the stamp face formed of a translucent material, and an encapsulation side-plate member for encapsulating the liquid photosensitive resin between the encapsulation front-plate member and the stamp stock;
• the encapsulation front-plate member being formed so as to be capable of being removed after the stamp face formation;
• and
• the encapsulation side-plate member being formed by solidifying the liquid photosensitive resin through irradiation with light.

A stamp unit comprising:

• a stamp stock;
• a base material for forming a stamp face comprising a liquid photosensitive resin transformable from a liquid state to a solid state by irradiation;
• a resin encapsulating section comprising a translucent, detachable cover member having a grip portion, said cover member being secured to an encapsulating side plate member, said encapsulating side plate member being secured to said stamp face, said encapsulating section being secured to said stamp stock in a manner such that said liquid photosensitive resin is exposable to radiation, said cover member being water soluble and transformable from a solid state to a gel state by irradiation;
• at least one injection channel having a first end open to said encapsulating section and a second end open to the exterior of said stamp unit;
• and
• a stopping member sealingly engageable with said injection channel.