Multiple-optical axis photoelectronic sensor
A photoelectric sensor, multi-optical axis technology, which is applied in the use of optical devices to transmit the direction of sensing components, circuits, discharge tubes, etc., can solve problems such as sensor abnormality
Inactive Publication Date: 2005-12-28
PANASONIC INDAL DEVICES SUNX
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In this way, in the synchronous mode, if the detection timing of the interference light accidentally coincides with the detection timing of the interference light in addition to the synchronization, the light projection and scanning operation will be performed in the original same cycle, and the interference light will be detected periodically, which may be judged as abnormality of the sensor. Happening
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[0017] pass below Figure 1 to Figure 5 An embodiment of the present invention will be described.
[0018] The multi-optical axis photoelectric sensor 1 of the present embodiment is as figure 1 As shown, the light projector 2 and the light receiver 3 are arranged to face each other, and have, for example, four optical axes L. On the surface of the light projector 2 facing the light receiver 3, one (4 in total) light-emitting diodes 21a-21d (hereinafter referred to as LED21a-21d) are arranged in a row in the vertical direction in each channel, and the light-receiver 3. On the surface facing the light projector 2, photodiodes 31a to 31d (referred to as PD31a to 31d) that form a pair with LED21 to 21d are arranged in the same vertical direction. Therefore, LED21a-21d corresponds to a light projecting element, PD31a-31d forms a pair with a light projecting element, and corresponds to the light receiving element which comprises an optical axis. In addition, in figure 1 The mu...
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The present invention relates to a multi-optical axis photoelectric sensor used for, for example, intrusion detection of a press device, and more particularly to a multi-optical axis photoelectric sensor that prevents misoperation due to mutual interference of other multi-optical axis photoelectric sensors. The detection of interference light is performed based on the interference light detection timing signal Si provided before the light-shielding detection timing signal Sr. If interference light is detected continuously at the interference light detection timing on the same optical axis, the pulse position of the light-shielding detection timing signal Sr is shifted by shortening the pause period tb and changing it to a pause period ta, thereby avoiding the pulse position of the light-shielding detection timing signal Sr The pulses of the interfering light overlap on the time axis and prevent mutual interference.
Description
technical field [0001] The present invention relates to a multi-optical axis photoelectric sensor used for, for example, intrusion detection of a press device, and more particularly to a multi-optical axis photoelectric sensor that prevents misoperation due to mutual interference of other multi-optical axis photoelectric sensors. Background technique [0002] As such a multi-optical axis photoelectric sensor, there is, for example, a multi-optical axis photoelectric sensor disclosed in (Japanese) Patent No. 2911369 . In this multi-optical axis photoelectric sensor, a light projector equipped with a plurality of light projecting elements and a light receiver in which a plurality of light receiving elements are arranged corresponding to each light projecting element are arranged oppositely, and each light projecting element and light receiving element constitute an optical axis. The light-emitting elements arranged in the light-emitter repeat the light-emitting scanning operat...
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IPC IPC(8): H03K17/78F16P3/14G01D5/34G01V8/20
Inventor 和气徹
Owner PANASONIC INDAL DEVICES SUNX