Sony Corporation

Kabushiki Kaisha Seidenko

Katsumi Koshimura

Hitoshi Takahashi

Ichiro Hino

Kazuo Ichikiawa

Akio Koike

A communication terminal device is miniaturized in a shape handy to carry while maintaining the necessary operability. The terminal device is constituted by a first box for voice communication and a second box linked with the first box via short-distance radio link for data input and data display. The first box is provided with minimum functions necessary for the voice communication so as to be small, whereas the second box can be provided with a keyboard high in operability and a relatively large display means so that display and input for data communication can be made conveniently.

Communication terminal device

Combined tape recorder and radio receiver

A flat speaker device having a flat speaker unit fitted into a through-hole for mounting a speaker of a wall surface board having its back secured to a wall surface leaving a specific spacing therebetween, the flat speaker unit comprising a total-drive type flat speaker comprising a plurality of magnets juxtaposed on a plane and a diaphragm formed from a plurality of projections for respectively covering the plurality of magnets, a speaker frame with a mounting flange mounted on the flat speaker so as to encircle the outer periphery of the flat speaker, rod-like screw members mounted so as to pass through the speaker frame from the front surface towards the back, and swining blades each disposed on the back of the speaker frame with one end threadedly engaged with a respective rod-like screw member and having a length such that when the blade is swung outwardly of a diagonal line of the speaker frame, the tip portion of the blade extends outwardly from the speaker frame.

Flat speaker unit

Growing community of inventors

Tokyo, Japan

Katsumi Koshimura