18458124. PIEZOELECTRIC ELEMENT AND ACTUATOR simplified abstract (FUJIFILM CORPORATION)

PIEZOELECTRIC ELEMENT AND ACTUATOR

Organization Name

FUJIFILM CORPORATION

Inventor(s)

Hiroyuki Kobayashi of Kanagawa (JP)

Seigo Nakamura of Kanagawa (JP)

Shinya Sugimoto of Kanagawa (JP)

Tsutomu Sasaki of Kanagawa (JP)

PIEZOELECTRIC ELEMENT AND ACTUATOR - A simplified explanation of the abstract

This abstract first appeared for US patent application 18458124 titled 'PIEZOELECTRIC ELEMENT AND ACTUATOR

Simplified Explanation

The patent application describes a piezoelectric element with specific characteristics in the composition and alignment of its piezoelectric films.

• The piezoelectric element includes a substrate and multiple electrodes and piezoelectric films arranged in a specific order.
• Both piezoelectric films contain PZT doped with a metal element M as the main component.
• One of the piezoelectric films has a spontaneous polarization aligned in the film thickness direction.
• The hysteresis curves of the polarization-voltage characteristics of the films must satisfy a specific relationship between coercive voltages.

Potential Applications

This technology can be applied in:

• Sensors
• Actuators
• Energy harvesting devices

Problems Solved

This technology addresses issues related to:

• Improving piezoelectric performance
• Enhancing device sensitivity
• Increasing energy efficiency

Benefits

The benefits of this technology include:

• Higher performance piezoelectric elements
• Improved device reliability
• Enhanced energy conversion efficiency

Potential Commercial Applications

The technology can be utilized in various commercial sectors such as:

• Aerospace
• Automotive
• Consumer electronics

Possible Prior Art

One possible prior art could be the use of PZT in piezoelectric elements, but the specific composition and alignment described in this patent application may be novel.

How does the alignment of the spontaneous polarization in the piezoelectric films affect the overall performance of the element?

The alignment of the spontaneous polarization in the piezoelectric films plays a crucial role in determining the efficiency and sensitivity of the piezoelectric element. By aligning the polarization in a specific direction, the element can exhibit enhanced piezoelectric properties, leading to improved performance in various applications.

What are the potential challenges in manufacturing piezoelectric elements with such specific composition requirements?

Manufacturing piezoelectric elements with the precise composition and alignment described in the patent application may pose challenges in terms of material synthesis, deposition techniques, and quality control. Ensuring uniformity and consistency in the properties of the piezoelectric films can be critical for achieving the desired performance characteristics in the final product.

Original Abstract Submitted

A piezoelectric element includes a substrate; and a first electrode, a first piezoelectric film, a second electrode, a second piezoelectric film, and a third electrode which are provided on the substrate in this order, in which both the first piezoelectric film and the second piezoelectric film contain PZT having a metal element M doped thereto, as a main component, one piezoelectric film of the first piezoelectric film and the second piezoelectric film has a spontaneous polarization aligned in a film thickness direction, and in a case where in a hysteresis curve showing polarization-voltage characteristics of the one piezoelectric film, a coercive voltage Vcf on a positive side and a coercive voltage Vcf on a negative side, and in polarization-voltage characteristics of the other piezoelectric film, a coercive voltage Vcr on a positive side and a coercive voltage Vcr on a negative sid, |Vcr+Vcr|<|Vcf+Vcf|−0.2 is satisfied.