JPS5910021A - Ultrasonic wave delay line - Google Patents

Abstract

PURPOSE:To obtain a transmission line of a double length with a delay means of the same size, by forming an ultrasonic wave delay line in such a way that the ultrasonic wave radiated from an input piezoelectric element is made incident to an output piezoelectric element after going and coming back the transmission line within a delay means. CONSTITUTION:Both input and output piezoelectric elements 11 and 12 are attached in parallel to the side surface 16 of a pair of side surfaces 16 and 17 which are formed by cutting obliquely with a 45 angle the corner parts at both sides of a side of a delay means 13 of glass, etc. The surface 16 is vertical to the main transmission surface of the medium 13. A transmission line 14 is provided within said main transmission surface, and a sound absorbing member 15 is provided. The ultrasonic wave radiated from the element 11 to the medium 13 is transmitted while reflected repetitively along the line 14 within the medium 13 and furthermore reflected by the other surface 17 to go back to the element 12 through the same line 14. In such a way, a double delay time is obtained with the same size of the delay medium.

Description

[Detailed description of the invention] Industrial applications The present invention relates to ultra-single wave delay lines.

Super 1-wave delay line is a color television receiver.

The configuration of a conventional example and its problems, which are used to create a delay of one horizontal operation period (approximately 64 μ5 ec) in yTR, etc. The configuration of a conventional ultrasonic delay line is explained in Fig. 1.
(1) C input pressure % element, <2) Vi output piezoelectric element, each of which is attached to a side surface of a pair of corners of a delay medium (3) such as glass cut out at 450 mm. (4) is the ultrasonic propagation path, and (5) is the @upper phase. By the way, the 3M waves radiated from the input electric element (7-0,), which has a simple configuration, propagate through one path (4) and go around the output piezoelectric element (2). ), a relatively large delay medium (3) is required to obtain a predetermined delay time. Therefore, if we try to increase the number of reflections to avoid miniaturization, the I\Il product that can be applied with the absorbing material (5) will decrease, and the level L of spurious will increase. I'd:+R1・( is η-sign.

In view of the problems, the present invention provides an ultrasonic delay line that can be miniaturized and that does not increase the spurious level. With the goal.

Structure of the Invention The present invention therefore has a delay/+! The input piezoelectric element and the output piezoelectric element are added to one 0Ii17'lil perpendicular to the body propagation main m, and the input pressure calculation 1. Hayako! i ship i'
The present invention also provides an ultrasonic delay line in which ultrasonic waves travel through a propagation path within a delay medium and are incident on an output piezoelectric element.

DESCRIPTION OF EMBODIMENTS The following embodiment of the present invention will be described with reference to FIGS. 2 and 6. α]) is an input pressure % element, 02 is an output piezoelectric collector,
Cut off the corners of the delay medium such as glass diagonally on both sides with a corner piece of 450.
I'm there. This side surface j is perpendicular to the main propagation surface 1 of the delay medium θ1. 0→F! , the propagation path of the ultrasonic wave in the principal plane of creation propagation, is 0■1 musical drama.

With such a configuration, the ultrasonic wave emitted from the input E-'RL element 01) to the delay medium 03 is repeatedly reflected and propagated along the propagation path 04) K within the delay medium 09, and further propagates along the other side surface α. It is reflected by the force and returns to the output piezoelectric element (2) through the same propagation path (14) in the propagating plane. Therefore,
A propagation path length twice as long can be obtained with the same size delay medium, and the application area of the sound absorbing material (1G) does not decrease.

Effects of the invention As is clear from Akira Shima above, the ultrasonic delay line of the present invention can obtain twice the delay time with the same size, and is half the size of the conventional one. It is possible to construct an ultrasonic delay line with a desired delay time, and since the area of the sound absorbing layer is not reduced, the level of individual distribution of Sufurial is not increased.

4.1 A simple view of sliM+ (bright Figure 1 is a 101 diagram of a conventional ultrasonic delay line, Figures 2 and 3N1 are an undeveloped example, and Figure 2 is a front view) ,
FIG. 6 ii is a side view.

0η is the input pressure %, element, (2) is the output piezoelectric element, α is the delay medium, 04) is the propagation path of the ultrasonic wave, OQ is the sound absorption wave,
The shame is that it takes 9 fil to install the input pressure % element and the output pressure frost 1 element.
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Claims (1)

[Claims] (1) An ultrasonic delay line in which an input piezoelectric element and an output piezoelectric element are added to one side surface perpendicular to the main propagation plane of a delay medium.