| 摘要 |
PURPOSE:To offer a glass delay line having a large spurious attenuation by increasing virtually the length of an input and an output transducer provided respectively to an input and an output faces of a glass delay element. CONSTITUTION:The glass delay line of this invention is provided with a glass delay element 1 and an input transducer 2 and an output transducer 3 fitted respectively to input and output faces 1a, 1b at slope ends of both sides of the element. Both faces of the glass delay element 1 are provided with a spurious absorbing body 8 to regulate the spread of a signal beam along the path of an ultrasonic wave signal. A notch 4 prolonged in the broadwise direction is provided respectively along each end face of the input and the output transducers 2, 3 to the input and output faces 1a, 1b of the glass delay element 1. Thus, the effective length of the input and output transducers 2, 3 is increased by the width of the notch 4 according to the principle of mirror image. As a result, the path of the spurious (b) is as shown in broken lines of Figure. |
