Omron Corporation

Hidenobu Umeda

Atsushi Irie

Hiroshi Goto

Koichi Furusawa

Masaaki Ikeda

Kenji Takemura

Hiromi Totani

Yoshiyuki Morita

Norimasa Yamanaka

Atsushi Osada

Kiyotoshi Ookura

Masahiro Yoneda

Naoki Fujimoto

Yukio Ogawa

Kiyotoshi Okura

The object of this invention is to produce a monitor which can correctly distinguish normal from abnormal vibration using automatically selected monitoring features and algorithms. The monitor can be used with a variety of devices with different vibration characteristics. The monitor according to this invention has a sensor that detects the vibration of an object. The monitor is operated in learning mode when the object is vibrating normally. The waveform of the vibration detected by this sensor is sampled over an appropriate period and analyzed. The data for each sampling feature are subjected to statistical processing, and the data which evince slight change are extracted as monitoring features. A monitoring algorithm is automatically made for these monitoring features. The algorithm selected in learning mode are used to evaluate the vibration of an object when the monitor is in operating mode. The operator does not need to set up the algorithm, and can monitor the object with a more reliable algorithm than the conventional one selected by fixed monitoring features.

Vibration monitor and monitoring method

An optical scanner and an optical scanning device, an optical sensor unit, a coded data reader, and a POS system employing an optical scanner. The optical comprises an elastically deformable element, a vibrational input segment disposed at a first end of the elastically deformable element, a driven segment disposed at a second end of the elastically deformable element, a vibration source for inducing vibration in the vibrational input segment, whereby the vibration induced in the vibrational input segment produces elastic deformation of the elastically deformable element and consequent movement of the driven segment, and a stop for limiting a range of the movement of the driven segment.

Optical scanner and optical scanning device, optical sensor, coded data

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Ibaragi-ken, Japan

Hidenobu Umeda