Matsushita Electric Industrial Co., Ltd.

Yukio Kasahara

Tsuneharu Nitta

Shigeru Hayakawa

Ritsuo Inaba

Ziro Terada

Kiyotaka Wasa

Yoshinori Takeuchi

Hidehiko Negishi

Yoshihiko Honjoya

A fiber-optic coil for use as the sensor loop of a fiber-optic gyroscope includes a first optical fiber segment wound as radially successive coiled layers around a coil bobbin in a first region thereof, and a second optical fiber segment wound as radially successive coiled layers around the coil bobbin in an axially adjacent second region thereof. The first and second optical fiber segments are joined to each other through a longitudinal middle portion, which is positioned in the radially innermost coiled layers of the first and second optical fiber segments adjacent to a longitudinal center of said coil bobbin. Each of the first and second optical fiber segments is wound in alternate axial directions in the radially successive coiled layers. The first and second optical fiber segments may be integrally joined to each other by the longitudinal middle portion, or may be separate from, but joined to, each other by a depolarizer across the longitudinal middle portion.

Fiber-optic coil and method of manufacturing same

Infrared detector

An electrostatic voltage sensor which includes a surface acoustic wave propagating medium and transmitting and receiving transducers coupled to the medium. The voltage sensor is provided with a separate voltage collecting member different from the electrode for applying a voltage or electric field, and the voltage obtained in the voltage collecting member is varied by a predetermined frequency for being applied to the electrode so as to detect external voltage by the variation component of the oscillating frequency.

Electrostatic voltage sensor

A method of making a polycrystalline sulphide ceramic body by sulphurizing an oxide material in a carbon disulphide atmosphere at a temperature in the range of 400-1000.degree. C and less than the transforming temperature of the sulphide, which transforming temperature represents either the decomposition temperature or the sublimation temperature inherent to the sulphide. One of the advantages of this method is that sulphides can be easily made by the very strong reduction action of carbon disulphide. This application also relates to sulphides made thereby.

Method of making a sulphide ceramic body

A method of making a zinc sulphide ceramic body having a low electrical resistance characterized by sulphurizing a starting oxide material consisting essentially of zinc oxide and from 0.01 atomic % to 6.0 atomic % of at least one oxide of a metal selected from the group consisting of aluminum, magnesium, nickel, cobalt, cadmium, lead, indium, bismuth, antimony, titanium, zirconium, silicon, tin, niobium, tantalum, tungsten, and the rare earth element metals in a carbon disulphide atmosphere at a temperature in the range of 700.degree. C to 1000.degree. C. This zinc sulphide ceramic body can be formed into non-linear elements such as phosphors, photoconductors, luminescent elements, varistors, piezoelectric transducers, capacitors and combinations thereof. Particularly, by using this zinc sulphide body in light emitting elements, the luminous efficiency as well as the working voltage can be improved.

Growing community of inventors

Tokyo, Japan

Yukio Kasahara