JPS5863300A - Multifrequency oscillator - Google Patents

Abstract

PURPOSE:To extract the ultrasonic outputs of many different frequencies, by laminating the piezoelectric elements, leading a terminal out of each surface and using simultaneously plural terminals in series or in parallel. CONSTITUTION:The piezoelectric oscillators 1 and 2 are laminated together, and terminals 6, 7 and 8 are led out of an intermediate electrode 3, upper and lower electrodes 4, 5 respectively. The terminals 6 and 7 are connected to a variable frequency power supply and driven. Otherwise the terminals 6, 7 and 8 are driven in parallel, or the terminals 6 and 8 are driven in series. Thus the resonances of different frequencies can be obtained in accordance with the method of driving. As a result, it is possible to transmit and receive many ultrasonic waves of different frequencies. When this oscillator is used to a transducer of a fish detector, the frequency is switched in order to avoid the interference to other fish detectors.

Description

[Detailed description of the invention] This relates to a multi-frequency oscillator that outputs .

In recent years, most fish boats have been equipped with fish finders, which has improved the accuracy of catching fish. Some devices that can operate are also used. However, in any case, the frequency used is almost the same depending on the fish species, so in urgent areas where many fishing boats are operating, there is a problem that the fish finder cannot fully demonstrate its original performance and performance due to interference. is also happening.

To solve these problems, equipping multiple transducers with different wave numbers or housing multiple vibrators with different frequencies in one transducer are used, but these methods However, the disadvantage is that the transducer becomes larger and the price becomes significantly higher.

In addition, one method is to use vibrations in the thickness direction and radial direction of a disc-shaped piezoelectric vibrator and the high frequencies of these vibrations, or to use vibrations in the thickness direction, radial direction, and ring of a single ring-shaped piezoelectric vibrator. There are also transducers that use transverse vibrations and their harmonics.

However, the high-volume vibration of a piezoelectric vibrator can only effectively generate either even-order harmonics or odd-number harmonics depending on its vibration mode, and due to impedance, even with the method described above, a single vibrator is required. There are three frequencies that can be used effectively.
There are four.

In order to solve the drawbacks of the above-mentioned conventional example, the present invention stacks and integrates a plurality of piezoelectric elements, provides terminals on the piezoelectric elements, and connects one or more of the piezoelectric elements in series or in parallel. 4.17 The purpose is to make effective use of each frequency acquisition and their combined vibrations by operating on a multi-frequency vibration that can output a large number of different frequencies. It is something that provides children. Hereinafter, embodiments will be described in detail with reference to the drawings.

FIG. 1 shows a configuration diagram of a multi-frequency vibrator according to an embodiment of the present invention, in which two piezoelectric elements 1 and 2 are integrated through an electrode 3. Terminals 6, 7.8 are connected to electrodes 4, 5 on both sides of the terminal, respectively.

In the vibrator 9 configured in this way, a variable frequency power source is connected to the terminals 6 and 7 at both ends of one piezoelectric element l,
As the frequency is changed, A (
65,48KHz, 222Ω), H(85,37KI2
% 640Ω), C(156,09KH□, (j75Ω
), I) (192,37KHz, 750Ω), E (23
9°: 31. KIlz, 413 Ω), but frequencies with lower impedances can be used.

Furthermore, when the piezoelectric elements 1 and 2 are driven in parallel by connecting the terminals 6, 8 and 7 to a variable frequency power supply, as shown in Fig. 8, A, (66,62K Hz 168Ω)
, B (92,62KH2,183Ω), C (152,8
2/I(z.

127Ω), D (190,19KHz% 2220),
E (214°62KHz, 885.0), F (2i,
18KH2X129Ω), but E
Since the impedance is high at the frequency, AXB, %C
, D, and F frequencies can be used.

Furthermore, when the terminals 6 and 8 at both ends of the piezoelectric element 1.2 are connected to a variable frequency power source and the piezoelectric element 1.2 is driven in series, as shown in FIG. 25
Resonance is expected at 8Ω), resulting in low impedance.

However, when driving a single piezoelectric element, the fifth
As shown in the figure, A (78.2KHz, 97Ω), B
(148,84KHz, 4750), C (202,12
KHz, 1420), D (288,49KH2,395
Resonance can be obtained at frequencies A and C, which have low impedance, although resonance can be obtained at frequencies N) and E (251,92 KHz % 7250).

In this way, the multi-frequency vibrator according to the embodiment of the present invention is
Compared to a conventional single piezoelectric vibrator, it is difficult to transmit and receive ultrasonic waves of many different frequencies.

FIG. 6 shows a configuration diagram of a multi-frequency vibrator according to another embodiment of the present invention, in which 10.11.12 are piezoelectric elements;
18.14.15.16 are electrodes, 17.18.19.
20 is a terminal.

Even in the multi-frequency vibrator of this embodiment configured in this way, when the terminals 17, 18 or 19.degree. 20 are connected to the variable frequency power source and the piezoelectric element 10 or 12 is operated, as shown in FIG. A50, (14KH2,26
5Ω), B (70.01KHz, 419Ω), but a wave number with lower impedance can be used.

Next, when the terminals 18 and 19 are connected to a variable frequency power source to drive the piezoelectric element 11, as shown in FIG.
(50, 96K Hz, 218 n), B'(9
8,24Kllz, IKn), C(157,91KI
Iz, 750Ω), 1) (202,09KI-1,81
0Ω), E(246,45KIlz.

Resonance can be obtained at a frequency of 625 Ω), but it can be used at the same wave number where the impedance is low.

Next, by connecting the terminals 17 and 19 to one end of the variable frequency power supply and the terminal 18 to the other end, and driving the piezoelectric elements 10 and 11 in parallel, as shown in FIG.
2X285Ω), B (81,57KH2,4100)
, C (96,03, H2% 215Ω), D (1
Resonance was obtained at 55-40K"zz190Ω),
All of these frequencies can be used.

In addition, when terminals 17 and 20 are connected, a variable frequency power supply is connected to terminals 18 and 19, and piezoelectric elements 10 and 12 are driven in series and piezoelectric elements 11 are driven in parallel, as shown in Fig. 1θ, A (72°88KH2,370Ω), B (93
, 88KHz, 195ΩL, C (158, 42KHz1
196Ω), D (197, 52KHz Hz 210
Ω), and all these frequencies can be used.

Furthermore, the terminals 17.19 are connected to one end of the variable frequency power supply, and the terminals 18.20 are connected to the other end of the piezoelectric element], 0.
11. When 12 are driven in parallel, A (72-88KHz % 138Ω), B (93
,77KH2% 91.5Ω), C(1,58,19K
Hzs 81Ω), I) (197,39KHzs 10
0Ω), E (2B5.69KH2, 182Ω), and all of these wave numbers can be used.

By stacking piezoelectric elements in this way and driving each piezoelectric element in series, in parallel, or in series and parallel, it is possible to transmit and receive ultrasonic waves of a large number of different frequencies.

In the above description of the embodiment, an example was explained in which two or eight piezoelectric elements were laminated. However, even if four or more piezoelectric elements are laminated, ultrasonic waves of many frequencies can be generated as in the previous embodiment. can transmit and receive waves.

As explained above, 1. According to the present invention, 21 or more piezoelectric elements are stacked and integrated, and one or more of the piezoelectric elements is driven in series, in parallel, or in series-parallel. Vibrations and their combined vibrations can be used effectively, and ultrasonic waves of many different frequencies can be transmitted and received.

[Brief explanation of drawings]

FIG. 1 is a block diagram of a multi-dimensional circuit according to an embodiment of the present invention, and FIGS. 2 to 4 show the same wave number when each piezoelectric element in FIG. 1 is driven. Figure 5 is a diagram showing the relationship between impedance, and Figure 5 is a diagram showing the relationship between frequency and impedance when a conventional single piezoelectric element is driven. Figure 6 is a diagram showing the multi-frequency vibration of another embodiment of the present invention. The configuration diagrams of FIGS. 7 to 11 are diagrams showing the relationship between (4) wave number and impedance when each piezoelectric element in FIG. 6 is driven. 1, 2.10-12... vibrator, 8-5, 13-1 (
5... Electrode, 6-8, 17-20... Terminal, 9.2
1...Multi-frequency camera. Patent applicant: Keisuke Honta

Claims (1)

[Claims] A multi-frequency vibrator characterized in that a plurality of piezoelectric elements are stacked and integrated, terminals are brought out from each side of the piezoelectric elements, and one or more of the piezoelectric elements are driven in series, in parallel, or in series and parallel. .