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Liquid spraying head driving method and driving device thereof

A technology of a liquid nozzle and a driving method, which is applied to the inking device, printing, etc., can solve the problems of poor shooting accuracy and inability to combine multiple droplets.

Inactive Publication Date: 2003-04-16
CANON KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0018] However, in industrial inkjet, when the distance between the nozzle and the drawing substrate is extremely reduced in order to improve the injection accuracy, a plurality of liquid droplets cannot be merged in the air, and each of them is sprayed on the substrate separately.
That is to say, the separation of shot time occurs in the drawing of one point, and the shot state is not a perfect circle, resulting in poor shot accuracy.

Method used

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  • Liquid spraying head driving method and driving device thereof
  • Liquid spraying head driving method and driving device thereof
  • Liquid spraying head driving method and driving device thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0137] A nozzle assembly composed of actuators with shear strain as shown in FIG. 9 was prepared.

[0138] The length L1 of the ink channel 506 is 8.0 mm. The size of the nozzle 510 is 25 μm in diameter φ1 on the ink ejection side, 40 μm in diameter φ2 on the ink flow path side, and 50 μm in length (thickness of orifice plate 512 ) L2.

[0139] In addition, the viscosity of the ink used in the experiment was 6 mPa·s at 25° C., and the surface tension was 50 mN / m. The hydrodynamic resonance frequency Fr of the coupling vibration system with the ink in the ink flow path and the pressurizing tool was measured with an impedance meter, and the reciprocal obtained was Tr=20 μsec.

[0140] The liquid containing member was placed on the substrate holder, and the distance between its surface and the surface of the orifice plate of the shower head was set at 300 μm.

[0141] Then, the electrode 513 in the air chamber 508 is applied as Figure 8 Drive waveforms are shown. This drive ...

Embodiment 2

[0149] The ejection test was carried out by driving the head assembly in the same manner as in Example 1 above. The results will be described with reference to Table 1. Table 1 shows Figure 8 As a result of applying the first injection pulse and the second injection pulse in the drive waveform shown, the width of the injection pulse A is taken as a parameter. In addition, the viscosity of the ink used was 6 mPa·s at 25° C. and the surface tension was 50 mN / m, and a relatively high viscosity liquid was used as the viscosity of the ink.

[0150] T 1 (μs)

Injection amount

Ink droplets coalesce to form

The speed of the main drop

Accuracy of shot point

24

20

5.8

×

25

23

6.6

△

26

25

6.9

△

27

27.5

7

○

28

29

7.5

○

29

29.5

7.8

○

...

Embodiment 3

[0158] As in Example 2, the same evaluation was performed with the pulse width of the injection pulse B as a variable parameter.

[0159] In the case of this example, it can be seen that the pulse width T 2 For: 9μs≤T 2 ≤11μs.

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Abstract

In order that the volume of a liquid drop can increase and the drop can reach with high precision even if the distance between a head nozzle and a plotted base is short, there is provided a driving method for a liquid discharge head including: a discharge port for discharging liquid; a pressure-applying portion communicating with the discharge port, for applying a pressure for discharge to the liquid; and a pressure generating device for generating the pressure, the method including a step of applying a first discharge pulse for discharging liquid and a second discharge pulse for discharging liquid to the pressure generating device in a sequential manner in response to an instruction of one-dot discharge, in which the pulse width of the first discharge pulse, the pulse width of the second discharge pulse, and a rest time between the first discharge pulse and the second discharge pulse are determined so that a first liquid discharged in response to the first discharge pulse has a volume equal to or greater than that of a second liquid discharged in response to the second discharge pulse and the discharge speed of the first liquid is lower than the discharge speed of the second liquid.

Description

technical field [0001] The present invention relates to a driving method and a driving device for a liquid ejection head not only for printing but also for manufacturing color filters, thin film transistors, light emitting elements, DNA elements, and the like. Background technique [0002] Liquid ejection devices are not only used in the production of printed matter, but also in the production of patterning processes such as color filters, thin film transistors, light-emitting elements, and DNA elements. [0003] As such an industrial patterning method, a lithography photolithography process is widely used. However, the photolithography process has many steps and high device cost, and the utilization rate of materials is extremely low. In addition, lithographic printing is limited in use as an industrial patterning technology in terms of printing accuracy. [0004] Thus, a patterning method using a liquid ejection head, also called an inkjet method, is increasingly used. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B41J2/05
CPCB41J2/04596B41J2/04581B41J2202/06B41J2/04588B41J2202/10
Inventor 藤村秀彦堀江亮子
Owner CANON KK
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