Abstract: A light projector and a light receiver each includes a case body, a light transmission plate closing an opening in a front face of the case body, and a pair of caps closing openings in end faces of the case body. The case body includes first supports supporting side edges of the light transmission plate, the caps respectively include second supports supporting ends of the light transmission plate, the light transmission plate is supported by the first supports and the second supports with an elastic member interposed between the light transmission plate and the first and second supports, and the cap is fixed to the case body while the seal member abutting on the end face of the case body is interposed between the cap and the case body. A cured liquid sealing agent is interposed between leading ends of the seal member and the elastic member.

Abstract: A communication unit and a safety system, through which an increase in initial cost is minimized in constructing a safety system, are provided. In a communication unit of the invention, two input and output portions are configured to be directly connected to each other when a plurality of unit main bodies are connected to each other in series, and a notched portion forming a disposition space for a connection portion-side terminal of at least a cable is provided at an end of the unit main body.

Abstract: A robot control system comprising a plurality of robots and a worker terminal that is capable of sending operation commands to a plurality of robots, by using wireless communications. The worker terminal has: an identification part that identifies a target robot to be used for work, from among a plurality of robots; a reception part that receives operation instructions for the robot from a worker; and a wireless communications part that sends operation commands to only the robot identified as the target robot by the identification part, when an operation instruction is received by the reception part.

Abstract: A light projector and a light receiver each includes a case body, a light transmission plate closing an opening in a front face of the case body, and a pair of caps closing openings in end faces of the case body. The case body includes first supports supporting side edges of the light transmission plate, the caps respectively include second supports supporting ends of the light transmission plate, the light transmission plate is supported by the first supports and the second supports with an elastic member interposed between the light transmission plate and the first and second supports, and first engagement units engaging with each other to restrict inward displacements of the ends of the light transmission plate supported by the second supports in the longitudinal direction are respectively provided in the cap and the light transmission plate.

Abstract: A light projector and a light receiver each includes a case body, a light transmission plate closing an opening in a front face of the case body, and a pair of caps closing openings in end faces of the case body. The case body includes first supports supporting side edges of the light transmission plate, the caps respectively include second supports supporting ends of the light transmission plate, the light transmission plate is supported by the first supports and the second supports with an elastic member interposed between the light transmission plate and the first and second supports, and the cap is fixed to the case body while the seal member abutting on the end face of the case body is interposed between the cap and the case body. A cured liquid sealing agent is interposed between leading ends of the seal member and the elastic member.

Abstract: A light projector and a light receiver each include a case body, a light transmission plate closing an opening in a front face of the case body, caps closing openings in end faces of the case body, and cap covers attached slidably to each cap. The case body includes first supports partially supporting side edges of the light transmission plate, the caps respectively include second supports supporting ends of the light transmission plate, the light transmission plate is supported by the first and second supports with an elastic member interposed between the light transmission plate and the first and second supports, the cap cover includes a pressing unit pressing the ends of the light transmission plate toward the second supports, and second engagement units engaging with each other to maintain a state where the pressing unit presses the light transmission plate are provided in the cap and the cap cover.

Abstract: A robot control system comprising a plurality of robots and a worker terminal that is capable of sending operation commands to a plurality of robots, by using wireless communications. The worker terminal has: an identification part that identifies a target robot to be used for work, from among a plurality of robots; a reception part that receives operation instructions for the robot from a worker; and a wireless communications part that sends operation commands to only the robot identified as the target robot by the identification part, when an operation instruction is received by the reception part.