| 摘要 |
PURPOSE:To obtain the ultrasonic diagnosing device which can vary a focal position. CONSTITUTION:This device has a 1st variable gain amplifier group 3 consisting of 1st variable gain amplifiers 4-0 to 4-N connected to each of vibrators 2-0 to 2-N, a 2nd variable gain amplifier group 3' provided with 2nd variable gain amplifiers 4-0' to 4-N' connected to the vibrators in parallel with the 1st variable gain amplifiers 4-0 to 4-N for each of the vibrators, a delay adding means 8 consisting of small delay elements 9 connected in series, a 1st selecting switch group 6, and a 2nd selecting switch group 6'. The gains of the 1st variable gain amplifiers 4-0 to 4-N and the 2nd variable gain amplifiers 4-0' to 4-N' are respectively changed, by which the focal position of the received waves is varied. |
