Mitsubishi Materials Corporation

Shinji Sakai

Yoshiomi Go

Akikazu Toyoda

Naoto Kitahara

Hiroaki Tanidokoro

Eiichirou Hirose

Eiichiro Hirose

Yoshiyuki Tanaka

Yoshitaka Mayuzumi

Ryoichi Sugimoto

Yoshinori Shinohara

Hiroshi Tomoto

Hidenao Matsushima

Kai Fujii

To provide a discharge tube having improved stability of operating voltage to repeated discharges. The discharge tube includes a cylindrical insulating hollow body having openings at least at both ends and at least a pair of sealing electrodes facing to each other for closing the openings so as to seal a discharge control gas inside the body, wherein a discharge trigger film made of a conductive material is formed on the inner circumferential surface of the insulating hollow body, each of the sealing electrodes has a convex portion projecting into the insulating hollow body and a discharge active layer(s) that is/are made of a material having higher electron emission characteristics than that of the sealing electrodes.

Discharge tube having discharge active layer(s)

Surge absorber

Antenna

An antenna assembly having patterned conductive films on the surfaces of a dielectric hexahedron with compatibility to mass-production, wherein the conductive films are formed on protuberances formed on the surface of the dielectric hexahedron on which protuberances and depressions are formed. In one embodiment, the dielectric hexahedron includes convex portions serving as the protuberances and concave portions serving as the depressions. A conductive film may be formed on the protuberances by roll coating, sputtering, evaporative deposition, and electroless deposition, thereby producing inexpensively a high quality antenna assembly having a circuit pattern formed thereon.

Method for antenna assembly and an antenna assembly with a conductive film formed on convex portions

The present invention relates to an antenna device to be used for portable communication sets and a method for reducing the manufacturing cost thereof. The antenna device includes a substrate having at least one of a dielectric material and a magnetic material and having upper and lower faces as well as a pair of side faces on which convex portions and concave portions are alternately formed. Also included is a helical conductor layer formed on the upper and lower faces, and on the concave portion or convex portion on a pair of the side faces of the substrate so as to spirally surround the entire substrate.

Antenna device and assembly of the antenna device

A dielectric composition for high frequencies, which comprises a ceramic component comprising Sr.sub.x (Ni.sub.1/3 Nb.sub.2/3).sub.y O.sub.3 (x/y=0.96-1.06), a ceramic component comprising Sr.sub.x (Ni.sub.1/3 Nb.sub.2/3).sub.y O.sub.3 (x/y=0.96-1.06) as the main constituent and one or more minor constituents which are selected from the group consisting of TiO.sub.2, SrTiO.sub.3 and CaTiO.sub.3 (TiO.sub.2 .ltoreq.25% by mole, SrTiO.sub.3 .ltoreq.6.5% by mole, and CaTiO.sub.3 .ltoreq.13.3% by mole), or a ceramic component comprising Sr.sub.x (Ni.sub.1/3 Nb.sub.2/3).sub.y O.sub.3 (x/y=0.96-1.06) and Ba(M.sup.II.sub.1/3 M.sup.v.sub.2/3)O.sub.3 (M.sup.II is Ni, Mg or Zn, and M.sup.v is Nb or Ta, provided that M.sup.II =Ni, Mg or zn when M.sup.v =Nb, and M.sup.II =Mg or Zn when M.sup.v =Ta) , and 0.1-50% by weight of glass added to the ceramic component.

Dielectric composition for high frequencies

Growing community of inventors

Naka, Japan

Shinji Sakai