Yukinori NAKAKURA majored physics, in particular physical property of materials, at Department of Physics, Graduate School of Science, and then engaged in developing of semiconductor device, in particular optical semiconductor device, about eight years in a consumer electronics maker. Then, he has joined to this firm, and mainly engaged in invention excavation consultation, acquisition of patent right and appraisement of patent right for domestic clients. As arts of invention, he handle with the invention of various fields of electrical, electronic and mechanical, including household electrical appliances, industrial equipment, medical equipment, etc. He always tries to capture essence of invention from technical view points and exerts effort in acquiring wide, clear and effective rights of patent.