JPS5863217A - Ultrasonic delay line - Google Patents

Abstract

PURPOSE:To eliminate the disturbance of characteristics due to an external effect and to increase the reliability for a small-sized ultrasonic delay line, by forming a space between a delay medium and a molded sheathing and molding a lead terminal to the molded sheathing. CONSTITUTION:Input and output piezoelectric elements 11 and 12 are stuck to a delay medium 10. The tip of a lead wire 13 soldered to the electrode of the elements 11 and 12 respectively is exposed and sealed up with a plastic film 15 via a reflection suppressing matter 14 to be molded with a sheathing resin 18. A lead terminal 16 is soldered to the line 13, and the soldered side of the terminal 16 is burried into the molded sheathing resin. Thus the medium 10 has no contact with the sheathing, and therefore the characteristics has no disturbance due to an external effect. Furthermore the high moisture resistance is ensured since a plastic film is used for sealing. Thus a compact delay line is obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to improvements in ultrasonic delay lines. A conventional ultrasonic delay line, which is an object of improvement of the present invention, will be explained with reference to FIG. Reference numeral 1 denotes a delay medium made of glass or the like, to which piezoelectric elements 2.6 for input and output are attached. Reference numeral 4 denotes an insulating substrate, and a total of four terminals 5, one set of two terminals, are implanted on both sides of the board, and a delay medium 1 is fitted between the terminals of one set of two terminals. The electrodes of the piezoelectric element 2.6 are connected to the terminals 5 by lead wires 6. Reference numeral 7 denotes a buffer made of an elastic material fitted around the delay medium 1 to maintain a distance so that the case 8 does not come into contact with the delay medium 1. 9 is a delay medium 1 to suppress unnecessary reflection of ultrasonic waves.
This is an anti-reflection material attached to both sides of the screen.

By the way, in the above conventional structure, the bottom surface of the delay medium 1 is in contact with the insulating substrate 4, and the periphery of the delay medium 1 is in contact with the buffer body 7 which is in close contact with the case 8, so it is easily affected by external influences and the characteristics However, since the sealing in the case 8 is not sufficiently sealed, the reliability is low in terms of moisture resistance.

The object of the present invention is to create an ultrasonic delay line that does not have the drawbacks mentioned above. Examples thereof will be described below with reference to FIGS. 2 and 6. 10 is a delay medium j1 made of glass or the like; 12 is a piezoelectric element for input and output;
16 is a lead wire soldered to the electrodes of the piezoelectric elements 11 and 12, and 14 is a reflection suppressor attached to both sides of the delay medium 1. The delay medium 10 to which the piezoelectric elements 11 and 12 are attached and the lead wires 16 are soldered is covered with a plastic film 15 with the tips of the lead wires 16 exposed, and the periphery is sealed by heat welding or adhesive. be done. 16
are held at regular intervals by tape 17.
The exposed tip of the lead wire 16 is soldered to the - terminal. After the delay medium 10 is sealed with a plastic film 15 and the lead edges 16 are soldered to the lead terminals 16, its entire surface is molded with an exterior resin 1B.

As described above, the ultrasonic delay line of the present invention has piezoelectric elements 11 and 12 for input and output attached to the delay medium 101C, and a lead wire 1 soldered to the electrodes of the piezoelectric elements.
5 is exposed and sealed with a plastic film 15, and a lead terminal 1 is attached to the exposed tip of the lead wire 16.
6 is soldered and the whole is molded with exterior resin 18 to have an inverted structure, and the mJ lead terminals 16 are held by tape 17 at a distance of one foot, so that the following effects are obtained.

(1) Since the delay medium 10 is sealed with a plastic film 15 and molded with an exterior resin 18 with a space maintained by the anti-reflection body 14, there is no contact with exterior objects, and the characteristics are not affected by external influences. No disturbance. (2) Since it is completely sealed by the plastic film 15, it is highly reliable in terms of moisture resistance. (6) Since the lead terminals 16 are taped, continuous manufacturing is easy and automatic insertion of products is possible. (4) Compared to the conventional one shown in FIG. 1, the structure is simpler, smaller and more compact, and productivity is improved.

[Brief explanation of the drawing]

No. 11 is a diagram showing a conventional ultrasonic delay line, in which (a) is a front view of the case, ←) is a side view of (a), (c) is a front view of the delay element, and (b) is a front view of (c). Side view No. 21 is an exploded view of the ultrasonic delay line of the present invention, fl) is a plan view of the delay element, ←)
Figure 6 is a plan view of the lead terminal: An embodiment of the ultrasonic delay line of the present invention, 0) is a plan sectional view, ←) is a side view of 0) [Symbols] 10...Delay medium, 11.12 --Piezoelectric element, 16--Lead wire, 14...Reflection suppressor, 15
...Plastic film, 16...Lead terminal,
17...Tape, 18...Exterior resin O1 diagram (a)
(Su) Fang 2nd Sai 3rd drawing

Claims (2)

[Claims] (1) Piezoelectric elements for input and output are pasted on a delay medium, the tips of the lead wires soldered to the electrodes of these piezoelectric elements are exposed and sealed with a plastic film, and the tips of the exposed lead wires are sealed with a plastic film. Ultrasonic delay line with lead terminals soldered to and entirely molded with exterior resin (2) The ultrasonic delay line according to claim (1), wherein the lead terminals are held by taping at regular intervals.