# US 2016/0355015 A1 · Liquid ejecting apparatus

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- Number: US 2016/0355015 A1
- Document ID: US20160355015A1
- Status: Published application
- Kind: A1
- Application number: 15/241,428
- Filed: 2016-08-19
- Published: 2016-12-08
- Earliest claimed: 2013-11-27
- Assignees: Seiko Epson Corporation
- Applicants: Seiko Epson Corporation
- Inventors: Toru KASHIMURA; Hiroshi SUGITA
- Web page: https://patentgrep.com/patent/US20160355015A1

## CPC

- B41J 2/14201: {Structure of print heads with piezoelectric elements}
- B41J 2/04541: {Specific driving circuit}
- B41J 2/04581: {controlling heads based on piezoelectric elements}
- B41J 2/04593: {Dot-size modulation by changing the size of the drop}
- B41J 2/04596: {Non-ejecting pulses}
- H01F 17/04: with magnetic core
- H01F 2017/048: {with encapsulating core, e.g. made of resin and magnetic powder}
- B41J: TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- H01F: MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES

## Abstract

A liquid ejecting apparatus includes a signal modulation section that causes an original drive signal to be pulse-modulated to generate a modulation signal, a signal amplification section that amplifies the modulation signal to generate an amplification modulation signal, a coil that smooths the amplification modulation signal to generate a drive signal, a piezoelectric element that deforms when the drive signal is applied thereto, a cavity that expands or contracts due to deformation of the piezoelectric element, and a nozzle that communicates with the cavity and ejects a liquid in accordance with increase and decrease of a pressure inside the cavity. The coil is a metallic alloy type.

## Claims

### Claim 1

A liquid ejecting apparatus comprising:
a signal modulator that modulates a first drive signal to generate a modulation signal;
a signal amplifier that amplifies the modulation signal to generate an amplified modulation signal;
a coil that smoothes the amplified modulation signal to generate a second drive signal;
a piezoelectric element that deforms when the second drive signal is applied thereto;
a cavity that expands or contracts due to deformation of the piezoelectric element; and
a nozzle that communicates with the cavity and ejects a liquid in accordance with increase and decrease of a pressure inside the cavity;
wherein the coil includes magnetic particles, and
wherein a product of a frequency of the amplified modulation signal measured in kHz and a size of a largest one of the magnetic particles measured in μm is equal to or less than 15,000.

### Claim 2 (depends on 1)

The liquid ejecting apparatus according to claim 1,
wherein the frequency of the amplified modulation signal is equal to or higher than 1 MHz.

### Claim 3 (depends on 1)

The liquid ejecting apparatus according to claim 1,
wherein the frequency of the amplified modulation signal is lower than 8 MHz.

### Claim 4 (depends on 1)

The liquid ejecting apparatus according to claim 1,
wherein the size of a largest one of the magnetic particles is less than 63 μm.

### Claim 5 (depends on 1)

The liquid ejecting apparatus according to claim 1,
wherein an average size of the magnetic particles ranges 5 μm to 25 μm.