Patent ID: 7332040

Claim:
A vaporizer which vaporizes a liquid material under a depressurized atmosphere, the vaporizer comprising: a liquid storing chamber temporarily storing the liquid material therein: a vaporizing chamber set in the depressurized atmosphere; a small aperture connecting between the liquid storing chamber and the vaporizing chamber so as to supply the liquid material to the vaporizing chamber; a vaporization valve body located on a side of said small aperture away from said vaporizing chamber so as to open and close an inlet port of said small aperture, said inlet port being located toward the liquid storing chamber; and an actuator independently controlling a degree of opening of the vaporization valve body, wherein said vaporization valve body is located outside of said vaporizing chamber and on a side opposite to said vaporizing chamber with respect to said small aperture, said vaporization valve body being entirely located outside said vaporizing chamber so that said small aperture is continuously open to the vaporizing chamber, thereby permitting uninhibited flow of vapor of the liquid material achieving a smooth flow of vapor of the liquid in said vaporizing chamber, with communication between said liquid storing chamber and said vaporizing chamber independently controlled by said actuator that opens and closes an end of said small aperture opening adjacent to said vaporizing chamber.