Abstract: A vortex ring generation device includes a casing having a gas passage and a discharge port, and an extrusion mechanism that extrudes a gas in the gas passage such that the gas in a vortex ring shape is discharged from the discharge port. V (m3) represents an extrusion volume, D (m) represents a diameter of the discharge port, L (m) represents a length of a cylinder having the diameter D and the volume V, and Re represents a Reynolds number of the discharged gas. 500?Re?3000 and 0.5?L/D?2.0.

Abstract: A vibration motor includes a first vibrating body including a first projection and a second vibrating body including a second projection, the first vibrating body and the second vibrating body receiving electric power and vibrating to generate a driving force and transmitting the driving force to a driven section, a first coil spring configured to urge the first vibrating body and the second vibrating body in a driving direction and restrict positions of the first vibrating body and the second vibrating body in the driving direction, and a case housing the first vibrating body, the second vibrating body, and the first coil spring. The first vibrating body, the second vibrating body, and the first coil spring are arranged in the driving direction. The number of first coil springs is smaller than the number of first and second vibrating bodies in the urging direction.

Abstract: A vortex ring generation device is configured to release an airflow in a form of a vortex ring from a release port. The vortex ring generation device includes a plurality of gas chamber units, an actuator, and a communication path. Each gas chamber unit has an air chamber that communicates with the release port. Each gas chamber units includes a fixing member forming the air chamber, and a movable member moving to push air out of the air chamber. The movable members of all of the gas chamber units are coupled together to form one movable body. The actuator is connected to an end portion of the movable body and is configured to drive the movable body. The communication path allows the air chambers of the plurality of gas chamber units to communicate with each other.

Abstract: A vibration motor includes a first vibrating body including a first projection and a second vibrating body including a second projection, the first vibrating body and the second vibrating body receiving electric power and vibrating to generate a driving force and transmitting the driving force to a driven section, a first coil spring configured to urge the first vibrating body and the second vibrating body in a driving direction and restrict positions of the first vibrating body and the second vibrating body in the driving direction, and a case housing the first vibrating body, the second vibrating body, and the first coil spring. The first vibrating body, the second vibrating body, and the first coil spring are arranged in the driving direction. The number of first coil springs is smaller than the number of first and second vibrating bodies in the urging direction.

Abstract: A determination section of a sleep control apparatus determines an awakening point based on target data. The target data is time-series data of biological information of a target person in a target period. The target period is a period between wakefulness to failing asleep of the target person, or a period from the wakefulness of the target person to a time point at which a predetermined time has passed since the target person fell asleep. The controller controls a target device so that the target device stimulates the target person to wake up at the awakening point.

Abstract: A vortex ring generation device includes a casing having a gas passage and a discharge port, and an extrusion mechanism that extrudes a gas in the gas passage such that the gas in a vortex ring shape is discharged from the discharge port. V (m3) represents an extrusion volume, D (m) represents a diameter of the discharge port, L (m) represents a length of a cylinder having the diameter D and the volume V, and Re represents a Reynolds number of the discharged gas. 500?Re?3000 and 0.5?L/D?2.0.