Abstract: A lighting system includes a wireless controller, luminaires each configured to communicating with the wireless controller, and a storage. The wireless controller classifies a first luminaire among the luminaires, which is able to communicate using first transmission power, into a first group and stores the first luminaire on the storage, and classifies a second luminaire among the luminaires, which is able to communicate using second transmission power greater than the first transmission power, into a second group and stores the second luminaire on the storage.

Abstract: A system includes: a sensor that detects motions of a first portion and a second portion of a body of a user; a controller that sets a base point of the second portion in response to the motion of the first portion and receives a prescribed input in response to the motion of the second portion with respect to the base point; and a notification device that contactlessly notifies a third portion of the body that the base point is set.

Abstract: A disc tray includes a bottom wall including an outer periphery and an inner rib supporter supporting the lowermost disc from below. The bottom wall is thickened from the outer periphery toward the inner rib supporter. The lowermost disc includes a data recording area, an inner rib, and an outer rib. When the lowermost disc is stationary, the outer rib of the lowermost disc and the upper surface of the bottom wall are separated by a gap. When the lowermost disc is inclined in such a manner that part of the outer rib of the lowermost disc comes into contact with the upper surface of the bottom wall, the data recording area of the lowermost disc and the upper surface of the bottom wall are separated by a gap greater than thickness of the outer or inner rib.

Abstract: A dimming lighting circuit includes: a rectifier circuit; a phase detection circuit which outputs a dimming signal having a signal level corresponding to a conduction phase angle of an AC voltage; and a DC-DC converter which receives a DC voltage output from the rectifier circuit and supplies a light source with a DC current corresponding to the signal level of the dimming signal output from the phase detection circuit. If the conduction phase angle detected when the dimming lighting circuit receives the AC voltage at power-on is less than or equal to a predetermined angle, the phase detection circuit outputs, as the dimming signal, a substitute signal having a signal level corresponding to a conduction phase angle greater than the conduction phase angle of the AC voltage, for a predetermined time period.