Omron Corporation

Omron Tateisi Electronics Co.

Akimitsu Ogata

Norio Onji

Hisato Fujisaka

Masanobu Hirose

Sadao Igarashi

Katsura Onozato

Toshimitsu Nozu

Katsuji Miwa

A high frequency oscillation type proximity switch prevents mutual interference when it is mounted adjacent to other proximity switches. The switch includes a comparator having a threshold value at a level higher than an object detection level of the oscillation output of the proximity switch. When an output is continuously obtained from the comparator, a beat is generated and the generation of mutual interference is detected. Then, the generation is externally displayed, and mutual interference is alarmed and prevented by changing the oscillation frequency.

Proximity switch

A data transmission system includes a data carrier which has a memory for storing therein data including an identification code and which is attached to an object and a main apparatus having a microwave oscillator so as to conduct communications with the data carrier by use of a microwave, thereby writing data in or reading data from the memory of the data carrier. The main apparatus transmits a microwave modulated by a command or data and thereafter transmits a nonmodulated carrier for a predetermined period of time. On receiving a command, the data carrier executes a read/write operation on the memory and then generates a response. The data carrier receives the nonmodulated carrier sent from the main apparatus so as to conduct a modulation of quadrature phase-shift keying thereon by use of response data, thereby reflectively transmitting the modulated carrier with a plane of polarization shifted from a plane of polarization of the received wave by 90.degree..

Signal transmission system and method

Growing community of inventors

Takatsuki, Japan

Akimitsu Ogata