Patent ID: 8009846
Filing Date: 2011-08-30
Classification: B06B,G10K,H02N,H04R

Abstract:
1. An ultrasonic speaker, comprising: an ultrasonic transducer including: a first sound wave output surface; and a second sound wave output surface, that is opposite from and substantially parallel to the first sound wave output surface; a first sound wave reflection plate, that is disposed at an acute angle with respect to the first sound wave output surface; a second sound wave reflection plate, that is disposed on opposite sides of the ultrasonic transducer from the first sound wave reflection plate, the second sound wave reflection plate being disposed at an acute angle with respect to the second sound wave output surface; a moving mechanism operable to selectively move at least one of the first and second sound wave reflection plates relative to at least one of the first and second sound wave output surfaces; and a controller that calculates and controls an amount of movement for the moving mechanism to move the at least one of the first and second sound wave reflection plates relative to the at least one of the first and second sound wave output surfaces, the amount of movement calculated based on a wavelength of sound output by the ultrasonic speaker.