Transducer

Patent metadata

Field	Value
Publication number	US-11035954-B2
Application number	US-201816164227-A
Country	US
Kind code	B2
Filing date	Oct 18, 2018
Priority date	Oct 19, 2017
Publication date	Jun 15, 2021
Grant date	Jun 15, 2021

Abstract

A transducer is provided, which includes an oscillator and a broadbanded matching circuit. In the oscillator, a peak frequency corresponding to a peak transmission sensitivity may separate from a center frequency in a given bandwidth, and a transmission sensitivity may increase as a frequency separates from the peak frequency with respect to the center frequency. The broadbanded matching circuit may be configured to perform an impedance matching so that the transmission sensitivity of the oscillator at the peak frequency becomes substantially equal to the transmission sensitivity of the oscillator at the center frequency.

First claim

What is claimed is:

1. A transducer, comprising:
an oscillator of which a peak frequency corresponding to a peak transmission sensitivity separates from a center frequency in a given bandwidth, and a transmission sensitivity increases as a frequency separates from the peak frequency with respect to the center frequency; and
a broadbanded matching circuit configured to perform an impedance matching so that the transmission sensitivity of the oscillator at the peak frequency becomes substantially equal to the transmission sensitivity of the oscillator at the center frequency.

2. The transducer of claim 1 , wherein the broadbanded matching circuit is comprised of a resistance connected in series with the oscillator, and an inductor connected in parallel with to the oscillator.

3. The transducer of claim 1 , wherein the broadbanded matching circuit is comprised of a resistance and a capacitor that are connected in series with the oscillator, and an inductor and a capacitor that are connected in parallel with the oscillator.

4. The transducer of claim 1 , wherein the peak frequency of the oscillator is set lower than the center frequency.

5. The transducer of claim 1 , wherein the oscillator is a BLT oscillator including a tail mass, and a front mass as an oscillating part.

6. The transducer of claim 5 , wherein the weight of the front mass is less than the weight of the tail mass.

7. The transducer of claim 2 , wherein the peak frequency of the oscillator is set lower than the center frequency.

8. The transducer of claim 3 , wherein the peak frequency of the oscillator is set lower than the center frequency.

9. The transducer of claim 2 , wherein the oscillator is a BLT oscillator including a tail mass, and a front mass as an oscillating part.

10. The transducer of claim 3 , wherein the oscillator is a BLT oscillator including a tail mass, and a front mass as an oscillating part.

11. The transducer of claim 4 , wherein the oscillator is a BLT oscillator including a tail mass, and a front mass as an oscillating part.

12. The transducer of claim 2 , wherein a resistance value of the resistance connected in series with the oscillator is larger than a resistance value of a resistance of an equivalent circuit corresponding to the oscillator.

13. The transducer of claim 12 , wherein the resistance value of the resistance connected in series with the oscillator is set to adjust the transmission sensitivity within a given attenuation width.

14. The transducer of claim 2 , wherein an inductor value of the inductor connected in parallel with to the oscillator is smaller than an inductor value of an inductor of an equivalent circuit corresponding to the oscillator.

15. The transducer of claim 14 , wherein the inductor value of the inductor connected in parallel with to the oscillator is set to adjust the transmission sensitivity within a given attenuation width.

16. The transducer of claim 3 , wherein a resistance value of the resistance connected in series with the oscillator is larger than a resistance value of a resistance of an equivalent circuit corresponding to the oscillator.

17. The transducer of claim 16 , wherein the resistance value of the resistance connected in series with the oscillator is set to adjust the transmission sensitivity within a given attenuation width.

18. The transducer of claim 3 , wherein an inductor value of the inductor connected in parallel with to the oscillator is smaller than an inductor value of an inductor of an equivalent circuit corresponding to the oscillator.

19. The transducer of claim 18 , wherein the inductor value of the inductor connected in parallel with to the oscillator is set to adjust the transmission sensitivity within a given attenuation width.

Assignees

• Furuno Electric Co

Inventors

• Murakami Eiji
• Miki Yasushi
• Tadokoro Masaaki

Classifications

• B06B1/0618 Primary

  of piezo- and non-piezoelectric elements, e.g. 'Tonpilz' · CPC title

• G01S7/527

  Extracting wanted echo signals {(Doppler systems G01S15/50)} · CPC title

• G01S7/524

  Transmitters · CPC title

• B06B1/0207 Primary

  Driving circuits (specially adapted for particular applications, see the relevant subclass, e.g. G01; circuits for steering transducer arrays G10K11/34; basic circuits H03) · CPC title

• G01S15/8954 Primary

  using a broad-band spectrum · CPC title