Patent ID: 7766021

Claim:
A substrate treatment apparatus, which treats a substrate with a treatment liquid that is ultrasonically vibrated, the apparatus comprising: an oscillator body which is rectangular-parallelepiped and has a plurality of guide grooves formed in a lower surface of the oscillator body and extending over an entire length in a longitudinal direction of the oscillator body and arranged substantially in parallel fashion with one another in a width direction of the oscillator body, a treatment liquid supply path extending through the oscillator body and having an opening on a lower surface thereof in a first end portion in the longitudinal direction thereof and inclining to a second end portion in the longitudinal direction thereof, and a diffusion groove formed in the lower surface of the oscillation body at one end portion thereof in the longitudinal direction, communicating with the treatment liquid supply path and extending over an entire length in the width direction of the oscillator body; a vibrator which is provided on an upper surface of the oscillator body and ultrasonically vibrates the oscillator body; and a cooling component for cooling the treatment liquid supplied to the treatment liquid supply path.