Uro Denshi Kogyo Kabushiki Kaisha

Uro Denshin Kogyo Kabushiki Kaisha

Hitoshi Komine

Michiharu Takahashi

Kiyozumi Chino

Yuji Ichikawa

A line radiation preventing element absorbs undesired radio waves superposed upon a wire or a coaxial cable by use of a magnetic substance, instead of reflection of the undesired radio waves and without increasing the cost thereof. The line radiation preventing element for preventing undesired radio waves superposed upon a wire led out of an electronic appliance from being radiated, has a conductive core wire (2) connected to the wire (5) led out of the electronic appliance; a conductive outer pipe (1) arranged concentrically with the conductive core wire (2), one end of the conductive outer pipe being shorted to the conductive core wire by use of at least one of a shorting plate (3) or an electric capacitance (14) and the other end of the conductive outer pipe being opened; and a magnetic substance (7) arranged between the conductive core wire and an inner wall of the conductive outer pipe.

Line radiation preventing element

A novel leakage radiation preventing element effectively prevents radio waves from being radiated from an electronic appliance, without depending upon a capacitor or a choke coil. The leaked current I.sub.os and I.sub.or generated from a hole or a gap formed in a casing or a chassis is introduced into a wave guide path and then attenuated by radio wave absorption function of a magnetic substance disposed therein. A coaxial conductor (2) is passed through a hole (107) formed in a chassis (3). The wave guide path (104) is formed between the chassis and a conductive disk (101) electrically floated from the chassis. A radially outward end of the wave guide path (i.e., the outer circumferential end of the conductive disk) is shorted to the chassis at high frequency, and further the inside of the wave guide path is filled with a ferrite ring (102). Therefore, when being propagated along the wave guide path, the high frequency current leaked from the hole or gap of the chassis is absorbed by the ferrite ring, without being radiated to the outside.

Leakage radiation preventing element

A shield case for a television signal branch distributor is so configured that a mesh element serving as a shield member, which is adhered to the lower surface of the cap member by means of an adhesive member having adhesive layers on its opposite sides, is tightly fitted between a case body and a cap member adapted to be combined with the case body. The mesh element is preferably made of brass or stainless steel, and is fixed to the case body by allowing the cap member to be forced into the case body.

Growing community of inventors

Bunkyo-ku, Japan

Hitoshi Komine