Optical barrier apparatus
AssigneeNihon Shingo Kabushiki Kaisha
InventorsNorihiro Asada, Koichi Futsuhara
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Abstract
A laser beam generated from a laser beam generating means 201 is reflected on a semiconductor mirror galvanometer 102. A region 105 to be inspected is scanned with the reflected laser beam 106. The laser beam 106 passing through the region 105 to be inspected is received by a light receiving device array 130. A pulse train included in an output signal produced from the light receiving device array 130 are monitored by a signal processing circuit 206. If an obstacle intrudes into the region 105 to be inspected and induces a pulse deficiency in the pulse train, the deficiency is detected by use of a pulse deficiency detecting circuit 204. A constitution mentioned above provides an optical barrier apparatus capable of reducing manufacturing costs without endangering a fail-safe property.
Claims3
An optical barrier apparatus, comprising:
- a generating means for a laser beam;
- a laser scanning means which reflects said laser beam generated from said generating means so that an area including a region to be inspected is canned with said laser beam;
- a concave reflection mirror which reflects said laser beam incident from said laser scanning means through said area including said region to be inspected;
- a light receiving device array which receives said laser beam reflected from said concave reflection mirror and incident through said area including said region to be inspected;
- and
- a signal deficiency detecting means which detects a deficiency in an output signal produced from said light receiving device array.
Dependencies are inferred from the claim text.