Abstract: To provide an object detecting device having a capability of sufficiently adjusting the detection areas to suit to the environment in which it is installed, the object detecting device includes an antenna AT for emitting a detecting beam to the detection areas and receiving a portion of the detecting beam which has been reflected from the detection areas, and adjusting covers 6 and 7 covering a front portion of the antenna AT and operable to adjust respective figurations of the detection areas. The adjusting covers 6 and 7 are selectively fitted one at a time to the front portion of the antenna AT for defining a different figuration of the detection areas. When one of the adjusting covers, that is, the cover 6 that is formed with a pair of cutouts 63 and 63 for suppressing the side lobe of the detecting beam is selectively used, the detection areas can be defined having no unnecessary detection areas.

Abstract: To provide an object detecting device having a capability of sufficiently adjusting the detection areas to suit to the environment in which it is installed, the object detecting device includes an antenna AT for emitting a detecting beam to the detection areas and receiving a portion of the detecting beam which has been reflected from the detection areas, and adjusting covers 6 and 7 covering a front portion of the antenna AT and operable to adjust respective figurations of the detection areas. The adjusting covers 6 and 7 are selectively fitted one at a time to the front portion of the antenna AT for defining a different figuration of the detection areas. When one of the adjusting covers, that is, the cover 6 that is formed with a pair of cutouts 63 and 63 for suppressing the side lobe of the detecting beam is selectively used, the detection areas can be defined having no unnecessary detection areas.

Abstract: A reflecting mirror includes an uncrystallized glass substrate and thin multilayer reflective coatings formed on a surface of the glass substrate by vapor deposition. The glass substrate contains 53 to 64 percent by weight of SiO2, 10 to 23 percent by weight of Al2O3, ZnO and MgO each in an amount of not less than 3 percent by weight and in a total amount of 8 to 20 percent by weight, Na2O and K2O in a total amount of 0.2 to 2 percent by weight, 1 to 8 percent by weight of B2O3, 0 to 4% by weight of TiO2, and As2O3 and Sb2O3 in a total amount of not more than 2 percent by weight. The glass substrate has an average expansion coefficient of not more than 35, and a distortion point of not less than 640 degrees C. Thus, the reflecting mirror can withstand a temperature of 615 degrees C. on its inner surface even though the substrate contains only a small amount of TiO2.

Abstract: Cameras take images of a predetermined area around a door. A distance measurement unit measures a distance from the cameras to each object in the taken images. Based on the measured distance, a floor detection unit detects a floor, and an object height/position detection unit detects a height and position of any object other than the floor. A door position detection unit and a door position identification unit 57 specify position of the door (i.e. open or closed) in the images taken by the cameras. A judgement unit judges presence or absence of an object which is neither the floor nor the door. If an object other than the floor and the door is observed in the images taken by the cameras, an output unit produces an object detection signal, so that the door is kept in an open state.

Abstract: Cameras 51, 52 take images of a predetermined area around a door. A distance measurement unit 53 measures the distance to each object in the taken images. Based on the measured distance, a floor detection unit 54 detects a floor, and an object height/position detection unit 55 detects the height and position of any object other than the floor. A door position detection unit 56 and the door position identification unit 57 specify the position of the door (i.e. open or closed) on the images. A judgement unit 58 judges the presence or absence of an object which is neither the floor nor the door. If an object other than the floor and the door is observed in the images, an output unit 59 produces an object detection signal, so that the door is kept in an open state.