Optex Co., Inc.

Cholmin Seo

Michinori Noguchi

Masatoshi Tsuji

According to one embodiment of a passive infrared sensor, a passive infrared sensorwhere an infrared sensing elementand an optical systemthat sets a detection area Aof the infrared sensing elementare covered with a cover. The passive infrared sensorincludes: a light emitting elementthat emits infrared light from the inside of the coverto the outside through the optical system; a reflective regionthat is disposed outside the coverand reflects at least some of the infrared light emitted from the light emitting element; and a light receiving elementthat receives the infrared light reflected by the reflective region, transmitted through the optical systemand reaching the inside of the cover

Passive infrared sensor and obstacle detection system used in the same

The combined sensor of the present invention is comprised of an MW sensor and a PIR sensor, in which the frequency difference of two microwaves transmitted by the MW sensor is set such that the phase difference between the IF signals received by the MW sensor is approximately 180&#xb0; when there is an object at the intermediate distance between the maximum detection distance within the target detection area and the maximum detection distance in the event of a deviation of the detection area attributable to mounting error of the infrared sensor

Combined sensor

To provide an intrusion detecting device capable of generating one of different warnings in proper timing dependent on the behavior of an intruder entering an alert region to thereby browbeat the intruder effectively, the intrusion detecting device () includes a plurality of sensor units (and), a sound generating device () capable of generating first and second warnings different from each other one at a time, and a warning generating unit (). The sensor units (and) have a plurality of alert areas (Ato A) defined from a site distant from and to another site near to a subject to be monitored for security purpose and operable to detect an intruder H entering any of the alert areas (Ato A). The warning generating unit () is operable to cause the sound generating device () to issue the first warning when detection is made by the sensor unit (), and also to cause the sound generating device () to issue the second warning when detection is made by at least the sensor unit () during a first predetermined length of time T1 subsequent to the detection by such sensor unit ().

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Otsu, Japan

Cholmin Seo