CN103753958B - Printing head - Google Patents
Printing head Download PDFInfo
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- CN103753958B CN103753958B CN201410015263.XA CN201410015263A CN103753958B CN 103753958 B CN103753958 B CN 103753958B CN 201410015263 A CN201410015263 A CN 201410015263A CN 103753958 B CN103753958 B CN 103753958B
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Abstract
The invention provides a printing head. The printing head comprises a pressure chamber, a vibrating plate and a piezoelectric element. A spraying hole is formed in the bottom surface of the pressure chamber. The vibrating plate is arranged above the top surface of the pressure chamber. The piezoelectric element is arranged above the vibrating plate. A periodic control voltage is applied to the piezoelectric element and changes in a wave mode. An oscillogram of the control voltage in one period includes a first change stage and a second change stage; in the first change stage, the control voltage changes to the maximum value on one side of a 0-voltage horizontal axis from 0 so that the vibrating plate can move away from the pressure chamber; in the second change stage, the control voltage changes to the maximum value on the other side of the 0-voltage horizontal axis from the maximum value on one side of the 0-voltage horizontal axis so that the vibrating plate can move towards the pressure chamber; the ratio between the maximum value on the other side of the 0-voltage horizontal axis and the maximum value on one side of the 0-voltage horizontal axis is larger than 1: 0.5. The printing head improves printing quality.
Description
Technical field
The present invention relates to printing device technology, particularly relate to a kind of printhead.
Background technology
Existing piezoelectric print head print procedure is by being applied on piezoelectric element by specific driving voltage, cause piezoelectric element to produce effect of stress and produce deformation on oscillating plate, and then cause ink chamber to compress or expand, the expansion of ink chamber and contraction cause the flowing of ink in ink chamber, when the deformation of pressure chamber reaches particular value, ink is sprayed by from inkjet mouth, is ejected on print media and forms printed drawings picture.
The principle of printhead continous inkjet is: in print procedure, and printer has the driving voltage of some cycles to piezoelectric element input continuous print, under the cycle of each driving voltage, sprays a certain amount of ink.But after each cycle sprays ink, printhead orifice place ink shakes up and down due to capillary effect, if printed again when this concussion is not calmed down, will cause spray the change of ink droplet quantity next time, the uniformity of ink droplet quantity when this directly affects single hole duplicate printing, and then affect printing effect.
Summary of the invention
The invention provides a kind of printhead, to improve print quality.
The invention provides a kind of printhead, comprising:
Pressure chamber, described pressure chamber one end is provided with ink feed passage, and the described pressure chamber other end is provided with spray orifice, and described spray orifice is located at the bottom surface of described pressure chamber;
Oscillating plate, is arranged on the top of described pressure chamber end face;
Piezoelectric element, be arranged on the top of described oscillating plate, described piezoelectric element is applied with periodic control voltage, and described control voltage is used for making described piezoelectric element to produce effect of stress, moves or deviates from described pressure chamber move to drive described oscillating plate towards described pressure chamber;
The change in wave shape of described control voltage, comprises the first changes phase and the second changes phase in the oscillogram of described control voltage one-period;
In described first changes phase, described control voltage is changed to the maximum of 0 voltage levvl axle side by 0, deviates from described pressure chamber move to make described oscillating plate;
In described second changes phase, described control voltage is changed to the maximum of 0 voltage levvl axle opposite side by the maximum of 0 voltage levvl axle side, and described oscillating plate is moved towards described pressure chamber;
Wherein, the ratio of the maximum of 0 voltage levvl axle side and the maximum of 0 voltage levvl axle opposite side is greater than 1: 0.5.
Based on above-mentioned, the printhead that the embodiment of the present invention provides, periodic control voltage is applied with to piezoelectric element, wherein, control voltage change in wave shape, the first changes phase and the second changes phase is comprised in the oscillogram of described control voltage one-period, in described first changes phase, described control voltage is changed to the maximum of 0 voltage levvl axle side by 0, deviate from described pressure chamber to make described oscillating plate to move, thus increase the volume of pressure chamber, now ink is by ink feed passage, enter in pressure chamber, in described second changes phase, described control voltage is changed to the maximum of 0 voltage levvl axle opposite side by the maximum of 0 voltage levvl axle side, move towards described pressure chamber to make described oscillating plate, thus the volume of pressure chamber is reduced, ink now in pressure chamber is stressed increase, ink is caused to spray from spray orifice.Prove by experiment, when the ratio of the maximum of 0 voltage levvl axle side and the maximum of 0 voltage levvl axle opposite side is greater than 1: 0.5, the residual pressure force value of spray orifice can be effectively reduced, thus reduce the Oscillation Amplitude of spray orifice ink, simultaneously very little for the impact of ink ejection amount, and then improve print quality.
Accompanying drawing explanation
The structural representation of a kind of printhead that Fig. 1 provides for the embodiment of the present invention;
Fig. 2 is the control voltage in Fig. 1, piezoelectric element applied;
Fig. 3-6 is the oscillogram of control voltage and the comparison diagram of spray orifice pressue-graph;
Fig. 7 is the force value comparison diagram of the first valley and the second peak value in the spray orifice pressue-graph in Fig. 3-6.
Reference numeral:
101: pressure chamber; 102: ink feed passage; 103: spray orifice;
104: oscillating plate; 105: piezoelectric element.
Detailed description of the invention
Please refer to Fig. 1 and Fig. 2, the embodiment of the present invention provides a kind of printhead, comprising: pressure chamber 101, and described pressure chamber 101 one end is provided with ink feed path 10 2, described pressure chamber 101 other end is provided with spray orifice 103, and described spray orifice 103 is located at the bottom surface of described pressure chamber 101; Oscillating plate 104, is arranged on the top of described pressure chamber 101 end face; Piezoelectric element 105, be arranged on the top of described oscillating plate 104, described piezoelectric element 105 is applied with periodic control voltage, described control voltage is used for making described piezoelectric element 105 produce effect of stress, moves or deviates from described pressure chamber 101 move to drive described oscillating plate 104 towards described pressure chamber 101; The change in wave shape of described control voltage, comprises the first changes phase S1 and the second changes phase S2 at the oscillogram S of described control voltage one-period; In described first changes phase S1, described control voltage is changed to the maximum of 0 voltage levvl axle side by 0, deviates from described pressure chamber 101 move to make described oscillating plate 104; In described second changes phase S2, described control voltage is changed to the maximum of 0 voltage levvl axle opposite side by the maximum of 0 voltage levvl axle side, moves towards described pressure chamber 101 to make described oscillating plate 104; Wherein, the ratio of the maximum of 0 voltage levvl axle side and the maximum of 0 voltage levvl axle opposite side is greater than 1: 0.5.
In the present embodiment, periodic control voltage is applied with to piezoelectric element 105, wherein, control voltage change in wave shape, the first changes phase S1 and the second changes phase S2 is comprised at the oscillogram S of described control voltage one-period, in described first changes phase S1, described control voltage is changed to the maximum of 0 voltage levvl axle side by 0, deviate from described pressure chamber 101 to make described oscillating plate 104 to move, thus increase the volume of pressure chamber 101, now ink is by ink feed path 10 2, enter in pressure chamber 101, in described second changes phase S2, described control voltage is changed to the maximum of 0 voltage levvl axle opposite side by the maximum of 0 voltage levvl axle side, move towards described pressure chamber 101 to make described oscillating plate 104, thus the volume of pressure chamber 101 is reduced, ink now in pressure chamber 101 is stressed increase, ink is caused to spray from spray orifice 103.Prove by experiment, when the ratio of the maximum of 0 voltage levvl axle side and the maximum of 0 voltage levvl axle opposite side is greater than 1: 0.5, the residual pressure force value at spray orifice 103 place can be effectively reduced, thus reduce the Oscillation Amplitude of spray orifice 103 place ink, simultaneously very little for the impact of ink ejection amount, and then improve print quality.
Specifically test for one below and be further described.Wherein, in the printhead adopted, oscillating plate 104 width is 55 microns, and thickness is 1 micron, and material is silica, and pressure chamber 101 is highly 70 microns, and width is 55 microns, and spray orifice 103 diameter is 26 microns.
Please refer to Fig. 3, now, the ratio of the maximum of 0 voltage levvl axle side and the maximum of 0 voltage levvl axle opposite side is 1: 0.5, wherein, in spray orifice 103 place pressue-graph L, first 4 sections is L1-L4, there is between L1 and L2 the first peak value P1, there is between L2 and L3 the first valley P2, there is between L3 and L4 the second peak value P3, wherein ink droplet sprays and occurs on the time point of the first valley P2, (the second peak value P3 time point is comprised) and represents the residual pressure force value of spray orifice 103 after the second peak value P3 time point, wherein now spray orifice 103 place residual pressure force value is larger for the larger representative of the second peak value P3, and the larger Oscillation Amplitude of spray orifice 103 place ink that directly causes of residual pressure force value is larger.
Please refer to Fig. 4, under maximum in control voltage 0 voltage levvl axle side and the constant prerequisite of waveform, reduce the maximum of 0 voltage levvl axle opposite side, the ratio making the maximum of 0 voltage levvl axle side and the maximum of 0 voltage levvl axle opposite side is 1: 0.3, ensure that waveform frequency is constant simultaneously, the force value now comparing the first valley P2 shown in Fig. 3 is substantially constant, this does not affect single venting amount after adjustment waveform is described, and now the force value of the second peak value P3 reduces a lot compared with the force value of the second peak value P3 shown in Fig. 3, this illustrates that the drive waveforms residual pressure force value after adjustment reduces, thus reduce the Oscillation Amplitude of spray orifice 103 place ink, and then improve print quality.
Please refer to Fig. 5, under maximum in control voltage 0 voltage levvl axle side and the constant prerequisite of waveform, again reduce the maximum of 0 voltage levvl axle opposite side, the ratio making the maximum of 0 voltage levvl axle side and the maximum of 0 voltage levvl axle opposite side is 1: 0.2, now, the force value comparing the first valley P2 shown in Fig. 4 is substantially constant, single venting amount is not affected yet after adjustment waveform is described, and the force value of the second peak value P3 obviously reduces further compared with the force value of the second peak value P3 shown in Fig. 4, thus further reduce the Oscillation Amplitude of spray orifice 103 place ink, and then improve print quality.
Please refer to Fig. 6, under maximum in control voltage 0 voltage levvl axle side and the constant prerequisite of waveform, again reduce the maximum of 0 voltage levvl axle opposite side, the ratio making the maximum of 0 voltage levvl axle side and the maximum of 0 voltage levvl axle opposite side is 1: 0.1, now, the force value comparing the first valley P2 shown in Fig. 5 is substantially constant, single venting amount is not affected yet after adjustment waveform is described, and the force value of the second peak value P3 obviously reduces further compared with the force value of the second peak value P3 shown in Fig. 5, thus further reduce the Oscillation Amplitude of spray orifice 103 place ink, and then improve print quality.
Wherein, in this test, when the maximum of voltage levvl axle side is different from the ratio of the maximum of 0 voltage levvl axle opposite side, the force value of the first valley P2 and the force value of the second peak value P3 are with reference to table 1.
Table 1
| Ratio | 1∶0.1 | 1∶0.2 | 1∶0.3 | 1∶0.5 |
| The force value [pa] of the first valley P2 | 1.0355e5 | 1.081e5 | 1.1075e5 | 1.2375e5 |
| The force value [pa] of the second peak value P3 | 0.4935e5 | 0.7785e5 | 0.8245e5 | 0.9587e5 |
Please refer to Fig. 7, when the ratio of the maximum of 0 voltage levvl axle side and the maximum of 0 voltage levvl axle opposite side is 1: 0.1, the force value of the first valley P2 is 1.0355e5 [pa], and the force value of the second peak value p3 is 0.4935e5 [pa].When the ratio of the maximum of 0 voltage levvl axle side and the maximum of 0 voltage levvl axle opposite side is 1: 0.2, the force value of the first valley P2 is 1.081e5 [pa], and the force value of the second peak value p3 is 0.7785e5 [pa].When the ratio of the maximum of 0 voltage levvl axle side and the maximum of 0 voltage levvl axle opposite side is 1: 0.3, the force value of the first valley p2 is 1.1075e5 [pa], and the force value of the second peak value p3 is 0.82450e5 [pa].When the ratio of the maximum of 0 voltage levvl axle side and the maximum of 0 voltage levvl axle opposite side is 1: 0.5, the force value of the first valley p2 is 1.2375e5 [pa], and the force value of the second peak value p3 is 0.9587e5 [pa].When the ratio of the maximum of 0 voltage levvl axle side and the maximum of 0 voltage levvl axle opposite side changes to 1: 0.1 from 1: 0.5, force value decline 0.2 [pa] of the second peak value p2, force value decline 0.46 [pa] of the second peak value p3, when the ratio of the maximum of the visible maximum when 0 voltage levvl axle side and 0 voltage levvl axle opposite side is greater than 1: 0.5, the residual pressure force value at spray orifice 103 place can be effectively reduced, thus reduce the Oscillation Amplitude of spray orifice 103 place ink, simultaneously very little for the impact of ink ejection amount, and then improve print quality.
In the present embodiment, preferably, the ratio of the maximum of 0 voltage levvl axle side and the maximum of 0 voltage levvl axle opposite side is 1: 0.1.As can be seen from above-mentioned test, now the residual pressure force value at spray orifice 103 place is less, and therefore the Oscillation Amplitude of spray orifice 103 place ink is less, can ensure good printing effect.
In the present embodiment, preferably, in the oscillogram S of described control voltage one-period, the first sustained period S3 and the second sustained period S4 is also comprised; Described first sustained period S3 is between described first changes phase S1 and the second changes phase S2, in described first sustained period S3, described control voltage remains on the maximum of 0 voltage levvl axle side, now, oscillating plate 104 can not produce displacement, and the volume of pressure chamber 101 remains unchanged; After described second sustained period S4 is positioned at the second changes phase S2, in described second sustained period S4, described control voltage remains on the maximum of 0 voltage levvl axle opposite side, now, oscillating plate 104 can not produce displacement, and the volume of pressure chamber 101 remains unchanged.Can be remained unchanged at the volume of a period of time Nei Shi pressure chamber 101 by the first sustained period S3 and the second sustained period S4, add ink and enter the stability that pressure chamber 101 and ink spray by spray orifice 103, improve printing effect.
Last it is noted that above each embodiment is only in order to illustrate technical scheme of the present invention, be not intended to limit; Although with reference to foregoing embodiments to invention has been detailed description, those of ordinary skill in the art is to be understood that: it still can be modified to the technical scheme described in foregoing embodiments, or carries out equivalent replacement to wherein some or all of technical characteristic; And these amendments or replacement, do not make the essence of appropriate technical solution depart from the scope of various embodiments of the present invention technical scheme.
Claims (3)
1. a printhead, is characterized in that, comprising:
Pressure chamber, described pressure chamber one end is provided with ink feed passage, and the described pressure chamber other end is provided with spray orifice, and described spray orifice is located at the bottom surface of described pressure chamber;
Oscillating plate, is arranged on the top of described pressure chamber end face;
Piezoelectric element, be arranged on the top of described oscillating plate, described piezoelectric element is applied with periodic control voltage, and described control voltage is used for making described piezoelectric element to produce effect of stress, moves or deviates from described pressure chamber move to drive described oscillating plate towards described pressure chamber;
The change in wave shape of described control voltage, comprises the first changes phase and the second changes phase in the oscillogram of described control voltage one-period;
In described first changes phase, described control voltage is changed to the maximum of 0 voltage levvl axle side by 0, deviates from described pressure chamber move to make described oscillating plate;
In described second changes phase, described control voltage is changed to the maximum of 0 voltage levvl axle opposite side by the maximum of 0 voltage levvl axle side, moves towards described pressure chamber to make described oscillating plate;
Wherein, the ratio of the maximum of 0 voltage levvl axle side and the maximum of 0 voltage levvl axle opposite side is greater than 1: 0.5.
2. printhead according to claim 1, is characterized in that, the ratio of the maximum of 0 voltage levvl axle side and the maximum of 0 voltage levvl axle opposite side is 1: 0.1.
3. printhead according to claim 1 and 2, is characterized in that, in the oscillogram of described control voltage one-period, also comprise the first sustained period and the second sustained period;
Described first sustained period is between described first changes phase and the second changes phase, and in described first sustained period, described control voltage remains on the maximum of 0 voltage levvl axle side;
After described second sustained period is positioned at the second changes phase, in described second sustained period, described control voltage remains on the maximum of 0 voltage levvl axle opposite side.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410015263.XA CN103753958B (en) | 2014-01-13 | 2014-01-13 | Printing head |
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| CN201410015263.XA CN103753958B (en) | 2014-01-13 | 2014-01-13 | Printing head |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1345272A (en) * | 1999-01-28 | 2002-04-17 | 日本电气株式会社 | Ink jet recording head driving method and ink jet recording device |
| CN1553859A (en) * | 2001-09-11 | 2004-12-08 | ������������ʽ���� | Liquid ejecting head drive method and liquid ejection device |
| CN1950215A (en) * | 2004-03-15 | 2007-04-18 | 迪马蒂克斯股份有限公司 | High frequency droplet ejection device and method |
| CN101665022A (en) * | 2008-09-04 | 2010-03-10 | 精工爱普生株式会社 | Liquid discharging apparatus and method of controlling liquid discharging apparatus |
| CN102233728A (en) * | 2010-03-30 | 2011-11-09 | 精工爱普生株式会社 | Liquid ejecting apparatus |
| JP5126444B2 (en) * | 2012-07-05 | 2013-01-23 | セイコーエプソン株式会社 | Liquid ejecting drive device, and liquid ejecting head and liquid ejecting device including the same |
-
2014
- 2014-01-13 CN CN201410015263.XA patent/CN103753958B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1345272A (en) * | 1999-01-28 | 2002-04-17 | 日本电气株式会社 | Ink jet recording head driving method and ink jet recording device |
| CN1553859A (en) * | 2001-09-11 | 2004-12-08 | ������������ʽ���� | Liquid ejecting head drive method and liquid ejection device |
| CN1950215A (en) * | 2004-03-15 | 2007-04-18 | 迪马蒂克斯股份有限公司 | High frequency droplet ejection device and method |
| CN101665022A (en) * | 2008-09-04 | 2010-03-10 | 精工爱普生株式会社 | Liquid discharging apparatus and method of controlling liquid discharging apparatus |
| CN102233728A (en) * | 2010-03-30 | 2011-11-09 | 精工爱普生株式会社 | Liquid ejecting apparatus |
| JP5126444B2 (en) * | 2012-07-05 | 2013-01-23 | セイコーエプソン株式会社 | Liquid ejecting drive device, and liquid ejecting head and liquid ejecting device including the same |
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| CN103753958A (en) | 2014-04-30 |
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Owner name: ZHUHAI SEINE PRINTING TECHNOLOGY CO., LTD. Free format text: FORMER OWNER: ZHUHAI NASIDA ENTERPRISE MANAGEMENT CO., LTD. Effective date: 20150608 |
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Effective date of registration: 20150608 Address after: 519075, Guangdong, Xiangzhou District, Zhuhai Avenue, No. 01, building 1, 3883, 2, 4, 7, 02, 04, 1, 2, 3, 5, Zhuhai Patentee after: Zhuhai Seine Printing Technology Co., Ltd. Address before: 519075 Xiangzhou, Zhuhai, Pearl Road, North District, No. 63, No. Patentee before: Zhuhai Nasida Enterprise Management Co., Ltd. |
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Effective date of registration: 20200927 Address after: Room 105-60088, No. 6, Baohua Road, Hengqin New District, Zhuhai City, Guangdong Province Patentee after: Zhuhai Sanwei Technology Co.,Ltd. Address before: 519075, Guangdong, Xiangzhou District, Zhuhai Avenue, No. 01, building 1, 3883, 2, 4, 7, 02, 04, 1, 2, 3, 5, Zhuhai Patentee before: Zhuhai Saina Printing Technology Co.,Ltd. |