Patent ID: 7641943

Claim:
A coating method for forming a coat on a base material having at least one through-hole, the through-hole having an inner surface between one end and the other end thereof, the coat being formed on a predetermined partial region of the inner surface of the through-hole, the partial region of the inner surface running a predetermined length from the one end of the through-hole toward the other end, the method comprising the steps of: forming a coat preform to be processed into the coat, on a region including the partial region of the inner surface of the through-hole; closing up the one end of the through-hole by detachably attaching a sheet member onto the base material coated with the coat perform or by directly placing and fixing the base material coated with the coat perform onto a support stage which supports the base material during the formation of the coat; supplying a mask material having ultraviolet ray absorbability into the through-hole having the coat preform; irradiating ultraviolet rays onto the base material from a side at which the other end of the through-hole lies, to remove the coat preform irradiated by the ultraviolet rays while leaving intact the coat preform on the partial region, wherein the coat preform left through the irradiation forms the coat, and wherein the coat preform removal is conducted through the use of attenuation of the ultraviolet rays by means of the mask material or through the combined use of the ultraviolet ray attenuation and at least one of the presence and absence of the mask material; and removing the mask material in the through-hole and the sheet member or the support stage from the base material after the irradiation.