| 摘要 |
A multiple optical axis photoelectric sensor capable of performing muting processing adapted to a plurality of kinds of workpieces having different heights without the need for complicated pre-setting according to the kinds of workpieces, is provided. The multiple optical axis photoelectric sensor is provided with a light projecting device and a light receiving device, which forms a plurality of optical axes together with the light projecting device. In at least one portion of a detection area, which is set according to the optical axes, a muting area for nullifying the result of detection of blocked light is set up. A sensor system acquires a range of blocked light corresponding to the blocked optical axis during passage of a workpiece, and alters the muting area of the multiple optical axis photoelectric sensor from a first range to a second range. |
| 主权项 |
1. A multiple optical axis photoelectric sensor (SNS) for detecting an object to be detected, which is conveyed by a conveyance device, the multiple optical axis photoelectric sensor (SNS) comprising:
a light projecting device having a plurality of light projecting sections which are arrayed in a line, a light receiving device having a plurality of light receiving sections which are disposed to face the light projecting sections, a light blocking determination section configured to perform a light blocking determination of whether or not any optical axes formed between opposed light projecting sections and light receiving sections are in a light blocking state, an output section configured to output a detection signal on the basis of a result of the light blocking determination, and a muting processing section configured to perform muting so as not to output the detection signal even though a subset or all of the optical axes are in a light blocking state, wherein the muting processing section comprises: a muting initiating section configured to initiate the muting of the optical axes in a first range in response to a signal input from an external muting device indicating that the object to be detected is conveyed toward the multiple optical axis photoelectric sensor (SNS), and a muting altering section configured to select, as the optical axis to be muted thereafter, the optical axes in a second range that includes a range of a subset or all of the optical axes of the first range and includes at least all blocked optical axes of the first range, depending on the light blocking state of the optical axes in the first range while muting the optical axes in the first range. |
