Matsushita Electric Works, Ltd.

Sadaaki Kondo

Koji Ikeda

Katsuya Tsukamoto

Masayuki Matsuo

Yasuhiro Fujii

Yoshihiro Kitsuda

Kyoji Masamoto

Isao Shimada

Shinji Morino

Yoshihiro Tanigawa

Yasumasa Ogawa

Hajime Takeda

Hiroshi Yokota

Shuji Taniguchi

Shoji Miyanari

Kimitake Okugawa

Masafumi Morimoto

Masakatsu Niwa

A device used in a multimedia communication system is formed with a transceiver unit for transmitting and receiving information signal to and from the inside of a room and a base unit adapted to be mounted to a wall of the room to detachably support the transceiver unit. The transceiver unit has a plug surface on which a plug projects, a circular wall projecting on the plug surface to surround the plug, and a guide wall projecting on the plug surface inside the circular wall and around the plug. The base unit comprises a disk member which is provided with a receptacle exposed in a receptacle surface defined on the disk member. The disk member has a diameter slightly smaller than an inner diameter of the circular wall so that the disk member can fit within the circular wall when the transceiver unit is attached to the base. The disk member is formed in the receptacle surface with a guide groove of such a configuration that the guide wall is allowed to be inserted into the guide groove only when the guide wall opposes to the guide groove at a particular angular orientation where the plug comes to be connectable with the receptacle. The device can provide a safe and easy working condition for attaching the transceiver unit to the base unit.

Device for transmitting and receiving information signal in multimedia

A plane antenna comprises a power-supply circuit, a radiator circuit and an earthing conductor which are stacked respectively with a dielectric layer interposed between them, in which the power-supply and radiator circuits are made independent of each other as electromagnetically coupled to each other and at least one of the dielectric layers is formed with a foamed resin, whereby insertion loss can be reduced to remarkably improve the antenna characteristics. Only with the interposition of the foamed resin dielectric layer or layers, an effective separation is achieved between at least the power-supply circuit and the earthing conductor or the power-supply circuit and the radiator circuit, for a large extent improvement in the assembling ability.

Planar antenna

Growing community of inventors

Moriguchi, Japan

Sadaaki Kondo