The acoustic radiating membrane is provided to equip a musical watch or a striking watch. The dome-shaped membrane comprises an active central portion, a lateral wall and a peripheral edge portion for holding the membrane in a watch case. The central part is configured in a convex shape or a conical shape and with dimensions devised to amplify a first vibration mode of one or more notes within a frequency range of between 500 Hz and 3.5 kHz.

The acoustic radiating membrane is provided to equip a musical watch or a striking watch. The dome-shaped membrane comprises an active central portion, a lateral wall and a peripheral edge portion for holding the membrane in a watch case. The central part is configured in a convex shape or a conical shape and with dimensions devised to amplify a first vibration mode of one or more notes within a frequency range of between 500 Hz and 3.5 kHz.

A safety system for bicycles includes a radar, a controller, and a warning apparatus, which includes a tube, a vibrating motor, and an impact sounder. The vibrating motor includes a rotary shaft and an eccentric block. The impact sounder includes an elastic member and an impact block. The elastic member includes a first end fixed to the inner wall of the tube and a second end connected to the impact block. When the controller decides to issue a warning based on a radar signal, it outputs a control signal to drive the rotary shaft to rotate. The rotation of the rotary shaft drives the eccentric block to rotate and vibrate, and the eccentric block strikes the impact sounder to make the impact block hit the inner wall and thus generate an impact force and emit a sound. The warning apparatus simultaneously provides the bicycle rider with vibrating, impacting, and audible warning.

A safety system for bicycles includes a radar, a controller, and a warning apparatus, which includes a tube, a vibrating motor, and an impact sounder. The vibrating motor includes a rotary shaft and an eccentric block. The impact sounder includes an elastic member and an impact block. The elastic member includes a first end fixed to the inner wall of the tube and a second end connected to the impact block. When the controller decides to issue a warning based on a radar signal, it outputs a control signal to drive the rotary shaft to rotate. The rotation of the rotary shaft drives the eccentric block to rotate and vibrate, and the eccentric block strikes the impact sounder to make the impact block hit the inner wall and thus generate an impact force and emit a sound. The warning apparatus simultaneously provides the bicycle rider with vibrating, impacting, and audible warning.

A flow controlled sound generation system is disclosed that includes one or more fluid pumps to control air flow through a sound channel. The air flow is modulated through one or more valves to produce audible frequency pressure waves.

A flow controlled sound generation system is disclosed that includes one or more fluid pumps to control air flow through a sound channel. The air flow is modulated through one or more valves to produce audible frequency pressure waves.

Air horns and methods for their operation. Such an air horn includes a main body having a cavity, a base, an actuator housing, and a diaphragm housing and bell fluidically connected to the cavity and to a channel within the main body. The actuator housing has a wall, a cavity surrounded by the wall, and standoffs within the cavity that define first and second sets of gaps between pairs of the standoffs. An actuator is coupled to the actuator housing so as to have first and second rotational positions. The actuator includes a shaft received in the cavity and standoff guides that individually receive pairs of the standoffs. The standoffs and the standoff guides interact to only permit axial movement of the actuator relative to the actuator housing when the actuator is in the first and second rotational positions and not at any rotational position therebetween.

Air horns and methods for their operation. Such an air horn includes a main body having a cavity, a base, an actuator housing, and a diaphragm housing and bell fluidically connected to the cavity and to a channel within the main body. The actuator housing has a wall, a cavity surrounded by the wall, and standoffs within the cavity that define first and second sets of gaps between pairs of the standoffs. An actuator is coupled to the actuator housing so as to have first and second rotational positions. The actuator includes a shaft received in the cavity and standoff guides that individually receive pairs of the standoffs. The standoffs and the standoff guides interact to only permit axial movement of the actuator relative to the actuator housing when the actuator is in the first and second rotational positions and not at any rotational position therebetween.

A lamp for a vehicle including a lamp housing part configured to accommodate a light source in an internal lamp housing part space, an outer lens part coupled to the lamp housing part and to cover the internal lamp housing part space, and a vibration part fixed to the lamp housing part, the vibration part including a first module fixed to the first side of the lamp housing part and a second module configured to face the first module, the first module including a first magnet and a first magnet fixing portion, the second module including a second magnet configured to face the first magnet, a second magnet fixing portion configured to accommodate the second magnet, and a coil member provided at one side of the second magnet and accommodated in the second magnet fixing portion, and the first magnet fixing portion being fixed to the lamp housing part.

A lamp for a vehicle including a lamp housing part configured to accommodate a light source in an internal lamp housing part space defined therein, an outer lens part coupled to one side of the lamp housing part and configured to cover the internal lamp housing part space, and a vibration part fixed to the lamp housing part, the vibration part including a first module fixed to a first side of the lamp housing part and a second module fixed to a second side of the lamp housing part and configured to face the first module, the first module includes a first magnet, and the second module including a second magnet configured to face the first magnet, a second magnet fixing portion configured to accommodate the second magnet, and a coil member provided at one side of the second magnet and accommodated in the second magnet fixing portion.