# US 2014/0198145 A1 · Inkjet recording device and inkjet recording method

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- Number: US 2014/0198145 A1
- Document ID: US20140198145A1
- Status: Published application
- Kind: A1
- Application number: 14/240,685
- Filed: 2012-08-21
- Published: 2014-07-17
- Earliest claimed: 2011-08-24
- Assignees: Konica Minolta, Inc.
- Inventors: Kumiko Furuno
- Web page: https://patentgrep.com/patent/US20140198145A1

## CPC

- B41J 2/04581: {controlling heads based on piezoelectric elements}
- B41J 2/04525: {reducing occurrence of cross talk}
- B41J 2/04588: {using a specific waveform}
- B41J 2/04596: {Non-ejecting pulses}
- B41J 2202/10: Finger type piezoelectric elements
- B41J: TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS

## Abstract

An inkjet recording device may include a plurality of pressure-generating chambers compartmented by walls including electromechanical conversion devices for generating a pressure; nozzles connected to the pressure-generating chambers; an ink supply portion; and a drive pulse generation device for driving said electromechanical conversion devices. The pressure-generating chambers may be separated into a plurality of groups. The pressure-generating chambers in each group may be driven in series so as to eject ink drops from said nozzles.

## Claims

### Claim 1

An inkjet recording device comprising:
a plurality of pressure-generating chambers compartmented by walls comprising electromechanical conversion devices for generating a pressure by deforming said walls by operating said electromechanical conversion devices;
nozzles connected to the pressure-generating chambers for ejecting ink drops by operating the pressure;
an ink supply portion for supplying an ink containing a pigment to said pressure-generating chambers; and
a drive pulse generation device for driving said electromechanical conversion devices,
wherein by separating said pressure-generating chambers into a plurality of groups, one group consisting of adjacent 3 pressure-generating chambers sandwiching said walls, said pressure-generating chambers in each group are driven in series so as to eject ink drops from said nozzles, wherein said drive pulse generation device ejects an ink drop from said nozzle by applying a first drive pulse for generating a negative pressure in said pressure-generating chamber on condition that the applying pressure on a meniscus in said nozzle is set within a range of −20 cmAq or more and −5 cmAq or less, and a second drive pulse for subsequently generating a positive pressure in said pressure-generating chamber to said electromechanical conversion device and the pulse width W1 of said first drive pulse is set within a range of 1.4AL≦W1<1.8AL on condition that AL is one half of the acoustic resonance of a pressure wave in said pressure-generating chamber.

### Claim 2 (depends on 1)

The inkjet recording device according to claim 1, wherein the pulse width W2 of said second drive pulse is 2AL.

### Claim 3 (depends on 1)

The inkjet recording device according to claim 1, wherein said first drive pulse and said second drive pulse are a square wave.

### Claim 4 (depends on 1)

The inkjet recording device according to claim 1, wherein said drive pulse generation device applies said first drive pulse and said second drive pulse to said electromechanical conversion device of said pressure-generating chamber for ejecting an ink drop from said nozzle, and applies only said second drive pulse to said electromechanical conversion device of said pressure-generating chamber for ejecting no ink drop from said nozzle.

### Claim 5 (depends on 1)

The inkjet recording device according to claim 1, wherein the speed of an ink drop from said nozzle after 0.5 mm flight is 6 m/s or more and 8 m/s or less.

### Claim 6 (depends on 1)

The inkjet recording device according to claim 1, wherein said ink is an aqueous ink.

### Claim 7 (depends on 1)

The inkjet recording device according to claim 1, wherein said ink is a UV ink.

### Claim 8 (depends on 1)

An inkjet recording method, wherein an image is recorded by ejecting an ink on a non-absorbable recording material or a slightly absorbable recording material as a recording material using the inkjet recording device according to claim 1.

### Claim 9 (depends on 8)

The inkjet recording method according to claim 8, wherein a process of heating said recording material from a rear surface of an image-recording surface at least in any one of cases where said recording material is heated before, while and after recording an image is included.