Patent ID: 7694890
Filing Date: 2010-04-13
Classification: G01S,G06K,H04B

Abstract:
1. A method for reading information by scanning a three-dimensional range of a passive ultrasonic tag ( 100 ) comprising: a tag body ( 102 ), and having two or more holes ( depth dimensions of at least two of the two or more holes are set to different values (d when a scan of ultrasonic waves is received across a three-dimensional range ( the two or more holes ( across a two-dimensional range at a first depth: a step of transmitting ultrasonic waves from a transmitter to the passive ultrasonic tag; and a step of receiving the reflected ultrasonic waves by a receiver; and a step of changing the first depth to a second depth; and across a two-dimensional range at a second depth: a step of transmitting ultrasonic waves from a transmitter to the passive ultrasonic tag; and a step of receiving the reflected ultrasonic waves by a receiver; and a step of making a comparison between a reception state of ultrasonic waves in the two-dimensional range at the first depth and a reception state of ultrasonic waves in the two-dimensional range at the second depth.