Omron Corporation

Hidetomo Ohtsuki

Toru Hosoda

Koyuru Nakano

Kohei Tomita

Takeshi Ashida

Yusuke Iida

Satoshi Motouji

Nobuhiro Fujimori

Controller with sensor for air cleaner

Transceiver for controller with sensor for air cleaner

An operation sectionis provided to a proximity sensor including: a detection section having an oscillation circuitand an amplification sectionhaving a function detecting a metal body using an oscillation amplitude of the oscillation circuitIn a set mode, when an operation to set an adjustment value for a sensitivity adjustment (a sensitivity adjustment value) is conducted in an operation sectionCPUgenerates a sensitivity adjustment signal in digital quantity indicating the sensitivity adjustment value and outputs the signal to a D/A converterThe sensitivity adjustment signal digital-to-analog converted by the D/A converteris given to a feedback circuitthrough a voltage adjustment circuitSince the feedback circuitis designed so as to change a feedback current quantity according to an applied voltage, a current with a magnitude matching a value the sensitivity adjustment signal is fed back to a resonance circuitto thereby control an oscillation amplitude.

Proximity sensor

A preamplifier portionis arranged between a head portioncontaining a detecting coil and an amplifier portionwherein a detecting circuit and a controlling circuit and the like are arranged. The preamplifier portionis connected to the head portionvia a shielded cableof fixed length, while connected to the amplifier portionvia multi core cablesandhaving connectorsand. In the preamplifier portionin addition to an oscillating circuit, an EEPROM containing a compensating table for compensating the relation between the oscillation output of the oscillating circuit and a detected distance is arranged. This EEPROM is connected to the controlling circuit at the side of the amplifier portion

Modular proximity sensor

A source table showing a standard relation between a detection object and a detection distance is stored in a memory ( ). A CPU ( ) receives inputs regarding distances to three measurement points from an input portion ( ) and recognizes an amplitude voltage corresponding to the input, as a measured value at the measurement point. Furthermore, the CPU ( ) extracts a range which corresponds to a difference between the farthest distance and the shortest distance, in which a ratio between voltages corresponding to measurement points closely resembles a ratio between the actually measured values, from the source table as a usage range, and creates a conversion table by correcting voltages in this extracted range.

Method of creating conversion table for distance detection and displacement sensor

Growing community of inventors

Fukuchiyama, Japan

Hidetomo Ohtsuki