JPH03280706A - Ultrasonic wave delay line - Google Patents

Abstract

PURPOSE:To evade a crack and chipping to improve the yield of a product by constituting a transducer of an organic chemical compound. CONSTITUTION:A pyramid shaped ultrasonic wave delay medium block 10 is formed by removing a corner along a center line to form a notch face 2, and a non-electrode forming part is provided to a middle part 12 on an upper face 1B and a side face 1C of the block 10 adjacent to the notch 2 to form earth electrodes 3, 3. The delay medium block 10 is cut off at a prescribed thickness to manufacture plural incomplete ultrasonic wave delay lines simultaneously. Tin is vapor-deposited to the upper face of plate shaped transducers 4, 5 on the electrodes 3, 3 formed on the transducer bonding face 2 of all the split incomplete ultrasonic wave delay lines to form electrodes 14, 14.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to ultrasonic delay lines, and more particularly to improvements in transducers.

[Prior Art] The mainstream ultrasonic delay line currently in widespread use is a multi-reflection type ultrasonic delay line using a rectangular ultrasonic delay medium in order to obtain a relatively long delay time while being compact. It becomes.

The ultrasonic delay line 60 shown in FIG. 1 is a multi-reflection type ultrasonic delay line, and has a transducer bonding surface 2 formed by cutting one side to 45@ along the center line with a thickness d.
The transducer 40 and the output transducer 50 are respectively bonded as shown on the transducer bonding surface 2 of the ultrasonic delay medium 20 provided with the ultrasonic delay medium 20.

On the transducer adhesive surface 2, grounding electrodes 3.3 separated in the center are provided, each electrode 3.
3, and electrodes 14 and 15 formed on the upper and lower surfaces of an inorganic compound (for example, lithium niobate) 40. An output juicer 50 is attached using a conductive adhesive (not shown). Further, lead wires 24.24, 34.34 are attached on the grounding electrodes 3, 3 and the electrode 14.15 using conductive adhesives A, A, . . . , A, respectively, as shown in the figure. It is connected.

Specifically, the ultrasonic delay line 6o configured in this way has the same shape through the following manufacturing process.

Things with the same characteristics are formed at the same time.

First, as shown in FIG. 7, a prismatic ultrasonic delay medium block (hereinafter referred to as 55 (referred to as "delay medium block"), and the cutout surface 2 of the
A grounding electrode 3.3 having a non-electrode forming portion is formed in the central portion 32 of each of the corner surface]-B and side surface]C of the delay medium block 55 adjacent to the cutout surface 2, as shown in the figure. In this conventional example, the electrodes 3, 3 are formed by vacuum evaporating tin.

Next, on the electrode 3 of the cutout surface 2, tin is vacuum-deposited on the upper and lower surfaces to form electrodes 14 and 15, respectively, to form plate-shaped input quadrature users 4 and 5, respectively, as shown in FIG.・) using conductive adhesive.

Next, this delay medium block 55 is cut to a certain thickness (approximately 2 to 3 mm) using a cutting machine 9 as shown in FIG.
), a plurality of ultrasonic delay lines 60, 60 . ..., 60 are manufactured.

[Problems to be Solved by the Invention] 17 However, ultrasonic delay line 60 according to conventional example
The transducer 40.50 is made of an inorganic compound, and the plate-shaped transducers 40, 50 that are attached to the delay medium block 55 are thin and brittle, so the transducer 40.50 is damaged. Also, when disconnecting the delay media block 55, the transducer 40.5
There are disadvantages in that the manufacturing process is prone to cracks and requires great care and skill, resulting in extremely low work efficiency.

[Object of the Invention] An object of the present invention is to provide an ultrasonic delay line which can improve the disadvantages of the above-mentioned conventional example and improve product retention with a relatively simple structure.

[Means for Solving the Problems] Therefore, in the present invention, an electroacoustic signal transducer and a transformer 17 functioning as an electroacoustic signal transducer are bonded to the adhesive surface of at least one transformer of a rectangular ultrasonic delay medium. In the ultrasonic delay line formed by the present invention, the transducer is made of an organic compound]2, thereby attempting to achieve the above object.

[Example] Hereinafter, one embodiment of the present invention will be described based on FIG.

Here, the same months are given to the same constituent members as in the above conventional example.

The ultrasonic delay line shown in FIG. 1 is an ultrasonic delay medium 20 having a thickness d [mm] and having a transducer adhesive surface 2 formed by cutting out a 45'' cutout on one side along the center line. On the adhesive surface 2 of the transducer, an input transducer 4 and an output transducer 5 are bonded as shown in FIG. 1, respectively.

On the transducer adhesive surface 2, grounding electrodes 3.3 separated in the center are provided, each electrode 3.
An electrode 14 is formed on the upper surface of a polymeric piezoelectric material (an organic compound with dielectric properties) on the input transformer 4.
An output voltage detector 5 is attached using a conductive adhesive (not shown). In addition, the earthing electrodes 3, 3
and electrodes 1-4, 14''-, respectively, using conductive adhesives A, A, . . .
, 2434.34 are connected.

Here, a method for manufacturing the ultrasonic delay line 1 configured as described above will be explained based on FIGS. 2 and 5.

First, as shown in FIG. 2, a prismatic ultrasonic delay medium block 10 is formed by cutting out the corners along the center line] 7 to form a cutout surface (transuser adhesive surface) 2. Grounding electrodes 3, 3 having non-electrode forming portions are formed on the upper surface IB and side IC of the delay medium block 10 adjacent to the notch surface 2, respectively, at the central portion 12 as shown in the figure.

In this embodiment, the electrodes 3, 3 are formed by vacuum evaporating tin.

Next, as shown in FIG. 3, this delay medium block 10 is cut into a certain thickness (approximately 2 to 3 [■m]) using a cutting machine 9.
As shown in the figure, a plurality of unfinished ultrasonic delay lines 11, 11 . ..., 11 are manufactured.

Subsequently, as shown in FIG. 4, the divided unfinished ultrasonic delay media 11, 11 . . . , 11 are put together, and plate-shaped transducers 4 and 5 are bonded to electrodes 3 and 3 formed on the respective transducer bonding surfaces 2. Then, tin is vacuum-deposited on the upper surface of each transducer 4, 5 to form an electrode 14.14.

In this case, the transducer 4.5 is not limited to a plate shape, but an organic compound is directly applied onto the transducer adhesive surface 2, and after curing, elliptical electrodes 14, 14.
..., 14 may be provided (Fig. 6 (a), (b) #
(see). Further, elliptical electrodes 14, 14, . ..., 14 may be formed.

Next, as shown in FIG. 5, the transducers 4.5 are inserted into each ultrasonic delay line 11.11. −．
A plurality of ultrasonic delay lines 1 as shown in FIG. 1 are manufactured at the same time.

According to this embodiment, since the transducers 4 and 5 are made of polymer piezoelectric elements (organic compounds), the transducers 4 and 5 may be cracked or cracked as in the above conventional example.
There are no cracks, and the product has good durability.

[Effects of the Invention] Since the present invention is configured as described above, it is possible to provide an ultrasonic delay line with good product retention with a relatively simple configuration.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of an ultrasonic delay line according to an embodiment of the present invention and a conventional example, and FIGS. Figure 6(a),
(b) is an explanatory diagram of the manufacturing process of a transducer, and FIGS. 7 to 9 are explanatory diagrams of the manufacturing process of an ultrasonic delay line according to a conventional example. 1... Ultrasonic delay line 2... Transducer adhesive surface 4...
・・・・・・Induction juicer 5・・・・・・・・・
・Output juicer 3rd seal

Claims (1)

[Claims] An ultrasonic delay line in which a transducer functioning as an electric-acoustic signal conversion element is bonded to at least one transducer bonding surface of a rectangular ultrasonic delay medium, wherein the transducer is made of an organic compound. An ultrasonic delay line characterized by: