# US 9,751,303 B2 · Liquid discharging apparatus, head unit, integrated circuit device for capacitive load driving, and capacitive load driving circuit

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- Number: US 9,751,303 B2
- Document ID: US9751303B2
- Status: Granted
- Kind: B2
- Application number: 15/362,184
- Filed: 2016-11-28
- Published: 2017-03-16
- Granted: 2017-09-05
- Earliest claimed: 2014-12-11
- Assignees: Seiko Epson Corporation
- Applicants: Seiko Epson Corporation
- Inventors: Takafumi Sano
- Web page: https://patentgrep.com/patent/US9751303B2

## CPC

- B41J 2/04541: {Specific driving circuit}
- B41J 2/04548: {Details of power line section of control circuit}
- B41J 2/04563: {detecting head temperature; Ink temperature}
- B41J 2/04581: {controlling heads based on piezoelectric elements}
- B41J 2/04586: {controlling heads of a type not covered by groups B41J2/04575 - B41J2/04585, or of an undefined type}
- B41J 2/04588: {using a specific waveform}
- B41J 2/04593: {Dot-size modulation by changing the size of the drop}
- B41J 2/04596: {Non-ejecting pulses}
- B41J 2/14233: {of film type, deformed by bending and disposed on a diaphragm}
- H03K 17/6871: {the output circuit comprising more than one controlled field-effect transistor}
- B41J 2002/14491: {Electrical connection}
- B41J: TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- H03K: PULSE TECHNIQUE (measuring pulse characteristics G01R; modulating sinusoidal oscillations with pulses H03C; transmission of digital information H04L; discriminator circuits detecting phase difference between two signals by counting or integrating cycles of oscillation H03D3/04; automatic control, starting, synchronisation or stabilisation of generators of electronic oscillations or pulses where the type of generator is irrelevant or unspecified H03L; coding, decoding or code conversion, in general H03M)

## Abstract

There is provided a driving circuit having a modulator which generates a modulation signal pulse-modulated from a source signal; a gate driver which generates an amplification control signal based on the modulation signal; a transistor which generates an amplification modulation signal amplified from the modulation signal based on the amplification control signal; a low pass filter which demodulates the amplification modulation signal and generates a driving signal; a first power source; and a temperature detection portion which detects temperature.

## Claims

### Claim 1

A driving circuit for driving a capacitive load, comprising:
a modulator which generates a modulation signal pulse-modulated from a source signal;
a gate driver which generates an amplification control signal based on the modulation signal;
a transistor which generates an amplification modulation signal amplified from the modulation signal based on the amplification control signal;
a low pass filter which demodulates the amplification modulation signal, generates a driving signal, and outputs the driving signal to the capacitive load;
a temperature detector which detects temperature; and
a boosting circuit which supplies a power source to the gate driver,
wherein a distance from the temperature detector to the boosting circuit is shorter than a distance from the temperature detector to the gate driver.

### Claim 2 (depends on 1)

The driving circuit for driving a capacitive load, according to claim 1,
wherein the boosting circuit is a charge pump circuit.

### Claim 3

A driving circuit for driving a capacitive load, comprising:
a modulator which generates a modulation signal pulse-modulated from a source signal;
a gate driver which generates an amplification control signal based on the modulation signal;
a transistor which generates an amplification modulation signal amplified from the modulation signal based on the amplification control signal; and
a low pass filter which demodulates the amplification modulation signal, generates a driving signal, and outputs the driving signal to the capacitive load,
wherein the oscillation frequency of the modulation signal is 1 MHz to 8 MHz.