Abstract: A pinhole type imaging device of the present invention includes a pinhole type aperture stop which allows advancing of light ray into an optical system and imaging, and at least one lens which is attached to the pinhole type aperture stop. Accordingly, an imaging device where it is realized that all imaging results of subjects positioned at different photographing distances are sharp, which has a simple structure and can be reduced in size, and which is suitable for attachment or use in an information terminal such as a small-sized image pickup device, a portable phone (a cellular phone), or a mobile type computer, and an auxiliary device thereof.

Abstract: A first conductor is provided on an outer circumference of a central conductor with an insulator therebetween, a second conductor is provided on a concentric circle having the central conductor as its center and outside the first conductor with an insulator therebetween. A coaxial cable is formed by coating the outside of the second conductor, which is on the concentric circle having the central conductor as its center, with an insulating external coating. A DC voltage source is able to apply DC voltage having a predetermined voltage value between the first conductor and the second conductor such that the direct current flowing in the first conductor and the second conductor takes a desired value. A noise barrier zone formed by the electro-magnetic action of the desired current is formed in the part surrounded by the first conductor and the second conductor on the outer circumference of the central conductor.