Patent ID: 7467786

Claim:
A nebulizer for an-ultrasonic humidifier, comprising: a cylindrical heat sink holder in which a flange having a plurality of assembling holes is provided at an upper end portion of the heat sink holder so that the heat sink holder can be positioned on one side of the inner bottom plate directly under a nebulizing nozzle, the heat sink holder having an upwardly opened interior space (R); a heat sink stacked on and assembled with the upper end portion of the heat sink holder, the heat sink having a vibrator guide receiving recess formed at a central portion of an upper surface of the heat sink; a printed circuit board (PCB) having a portion fixed to a bottom surface of the heat sink by means of an assembling member (F) such as a bolt, so that the PCB is located in an interior space of the heat sink holder, the PCB including an ultrasonic oscillation circuit; a cylindrical vibrator guide inserted in the vibrator guide receiving recess of the heat sink in such a manner that an outer cylindrical surface of the cylindrical vibrator guide is in close contact with an inner cylindrical surface of the vibrator guide receiving recess, the vibrator guide having a vibrator holding groove formed along an inner cylindrical surface of a cylindrical hole which extends vertically through a central portion of the vibrator guide; a disc-shaped vibrator received in the vibrator guide in such a manner that an entire outer circumferential portion of the disc-shaped vibrator is tightly inserted in the vibrator holding groove formed at the inner cylindrical surface of the vibrator guide; a guide fixing ring having a bottom surface in close contact with an upper surface of the vibrator guide and having an outer peripheral surface in close contact with an upper portion of the inner cylindrical surface of the vibrator guide receiving recess, so as to hold the vibrator guide; and an inverted U-shaped water level sensor having two legs inserted in and engaged with a pair of water sensor holes formed on the upper surface of the heat sink so that the water level sensor stands erect.