# US 2014/0152144 A1 · Oriented piezoelectric ceramic, piezoelectric element, liquid discharge head, ultrasonic motor, and dust removing device

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- Number: US 2014/0152144 A1
- Document ID: US20140152144A1
- Status: Published application
- Kind: A1
- Application number: 14/118,495
- Filed: 2012-05-28
- Published: 2014-06-05
- Earliest claimed: 2011-05-31
- Assignees: University of Yamanashi; Canon Kabushiki Kaisha
- Inventors: Takayuki Watanabe; Shunsuke Murakami; Nobuhiro Kumada
- Web page: https://patentgrep.com/patent/US20140152144A1

## CPC

- H10N 30/8536: {Alkaline earth metal based oxides, e.g. barium titanates}
- B41J 2/14233: {of film type, deformed by bending and disposed on a diaphragm}
- C04B 35/495: based on vanadium, niobium, tantalum, molybdenum or tungsten oxides or solid solutions thereof with other oxides, e.g. vanadates, niobates, tantalates, molybdates or tungstates
- H02N 2/106: {Langevin motors}
- H02N 2/163: {Motors with ring stator}
- H10N 30/2047: {Membrane type}
- H10N 30/8542: {Alkali metal based oxides, e.g. lithium, sodium or potassium niobates}
- C04B 2235/3201: Alkali metal oxides or oxide-forming salts thereof
- C04B 2235/3215: Barium oxides or oxide-forming salts thereof
- C04B 2235/3236: Alkaline earth titanates
- C04B 2235/3281: Copper oxides, cuprates or oxide-forming salts thereof, e.g. CuO or Cu2O
- C04B 2235/5292: Flakes, platelets or plates
- C04B 2235/5296: with a defined aspect ratio, e.g. indicating sphericity
- C04B 2235/6025: Tape casting, e.g. with a doctor blade
- C04B 2235/72: Products characterised by the absence or the low content of specific components, e.g. alkali metal free alumina ceramics
- C04B 2235/725: Metal content
- C04B 2235/767: Hexagonal symmetry, e.g. beta-Si3N4, beta-Sialon, alpha-SiC or hexa-ferrites
- C04B 2235/768: Perovskite structure ABO3
- C04B 2235/79: Non-stoichiometric products, e.g. perovskites (ABO3) with an A/B-ratio other than 1
- H10N 30/097: by sintering
- H10N: ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- B41J: TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- C04B: LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE {(roofing granules E04D7/005)}; CERAMICS (devitrified glass-ceramics C03C10/00); REFRACTORIES; TREATMENT OF NATURAL STONE
- H02N: ELECTRIC MACHINES NOT OTHERWISE PROVIDED FOR

## Abstract

Provided is an oriented piezoelectric ceramic of satisfactory piezoelectricity, which includes a metal oxide represented by (1−x)NaNbO3-xBaTiO3. Also provided are a piezoelectric element using the oriented piezoelectric ceramic which includes the metal oxide represented by (1−x)NaNbO3-xBaTiO3, and a liquid discharge head, an ultrasonic motor, and a dust removing device which use the piezoelectric element. An oriented piezoelectric ceramic includes as a main component a metal oxide represented by the following general formula (1), in which the oriented piezoelectric ceramic has a lead content and a potassium content that are each 1,000 ppm or less: (1−x)NaNbO3-xBaTiO3 . . . General formula (1), where a relationship of 0<x<0.3 is satisfied.

## Claims

### Claim 1

An oriented piezoelectric ceramic, comprising as a main component a metal oxide represented by general formula (1),
wherein the oriented piezoelectric ceramic has a lead content and a potassium content that are each 1,000 ppm or less:
(1−x)NaNbO3-xBaTiO3 general formula (1),
where a relationship of 0<x<0.3 is satisfied.

### Claim 2 (depends on 1)

The oriented piezoelectric ceramic according to claim 1, wherein the oriented piezoelectric ceramic is (100) oriented in a pseudocubic system.

### Claim 3 (depends on 1)

The oriented piezoelectric ceramic according to claim 1, wherein the oriented piezoelectric ceramic has a degree of orientation expressed by a Lotgering factor that is 50% or more and 100% or less.

### Claim 4 (depends on 1)

The oriented piezoelectric ceramic according to claim 1, further comprising 0.05 mol % or more and 2 mol % or less of copper with respect to 1 mol of the metal oxide.

### Claim 5 (depends on 1)

A piezoelectric element, comprising:
the oriented piezoelectric ceramic according to claim 1; and
a pair of electrodes provided so as to be in contact with the oriented piezoelectric ceramic.

### Claim 6 (depends on 5)

A liquid discharge head, comprising:
a liquid chamber comprising a vibration portion including the piezoelectric element according to claim 5; and
a discharge port communicating with the liquid chamber.

### Claim 7 (depends on 5)

An ultrasonic motor, comprising:
a vibration body including the piezoelectric element according to claim 5; and
a moving body that is in contact with the vibration body.

### Claim 8 (depends on 5)

A dust removing device, comprising a vibration body including the piezoelectric element according to claim 5.