Active infrared sensor
AssigneeOptex Co., Ltd.
InventorMasashi Iwasawa
Life of this patent
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Abstract
Optical transmitter 2 is equipped with transmitted pulse modulator 23. at which a plurality of optical transmission patterns have previously been stored. The respective stored optical transmission patterns have mutually different ratios between infrared pulse ON times and OFF times. Optical output of infrared signal(s) transmitted from optical transmitter 2 is made variable as a result of the fact that infrared pulse(s) output during infrared output period(s) is or are output in accordance with an optical transmission pattern selected from among the plurality of optical transmission patterns.
Claims10
In the context of an active infrared sensor equipped with one or more optical transmitter means for transmitting one or more infrared signals toward one or more protected areas, entry of one or more objects into at least one of the protected area or areas being detected when at least one of the infrared signal or signals transmitted from at least one of the optical transmitter means is interrupted, an active infrared sensor characterized in that:
- at least one of the infrared signal or signals transmitted from at least one of the optical transmitter means is produced by repeated alternation between one or more infrared output periods and one or more infrared non-output periods, a plurality of infrared pulses being output during at least one of the infrared output period or periods;
- and
- it is equipped with one or more transmitted pulse modulation means capable of causing optical output of at least one of the infrared signal or signals transmitted from at least one of the optical transmitter means to be made variable as a result of adjustment of at least one ratio between infrared pulse ON time and OFF time during at least one of the infrared output period or periods.
Dependencies are inferred from the claim text.