Orc Manufacturing Co., Ltd.

Yosho Co., Ltd.

Chiaki Abe

Minoru Watanuki

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.

Coaxial cable

An exposure apparatus having upper and lower ultraviolet rays irradiating devices which are vertically symmetrically disposed above and below a pattern-forming board having through holes therein, and upper and lower light-transmissible plates which are disposed spacedly from each other in a light path of the ultraviolet rays irradiated to the board so as to be vertically symmetrically disposed with respect to the board and horizontally movable, each of the ultraviolet rays irradiating devices having an electric discharge lamp and a reflection mirror and each of the light-transmissible plates having an uneven surface of a sawtooth section. With this arrangement, a proper photochemical reaction can be induced to the photoresist on the surface of the board and the inner wall surfaces of the through holes to thereby improve a working efficiency of a pattern forming process.

Exposure apparatus for forming pattern on printed-wiring board

An improved alignment table employable for an automatic exposing apparatus used for producing a number of printed wiring boards, wherein the alignment table is designed in a flat and hollow box-shaped configuration comprising an upper plate, a lower plate and side plates, the upper plate and the lower plate are provided with transparent plates at positions located opposite to each other, respectively, and the upper surface of the transparent plate placed on the upper plate is provided in the form of a mat surface.

Growing community of inventors

Tokyo, Japan

Chiaki Abe