Importance

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Abstract

The present invention relates to an optical barrier apparatus which scans a detection area with an optical beam, and when the scanning beam is blocked by an object so that a reflection beam is not received, notifies of object presence. An optical beam from an optical beam generating circuit (11) is reflected by a scan mirror (12) and a detection area (1) is scanned by a scanning beam (BM1). The scanning beam (BM1) is reflected by a reflector array (23) of another unit and received by a light receiving element (14), and the presence/absence of a pulse deficiency of light reception output is detected by a signal deficiency detection circuit (15). When the scanning beam (BM1) is blocked by an object (30) so that a part of the reflection beam from the reflector array (23) cannot be received and a pulse deficiency occurs in the light reception output, an output (Z1) from the signal deficiency detection circuit (15) becomes a logic value zero to thus notify of object presence.

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First Claim