CN1103287C - Method of prolonging the service life of hot bubble type ink jet print head - Google Patents
Method of prolonging the service life of hot bubble type ink jet print head Download PDFInfo
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- CN1103287C CN1103287C CN98105195A CN98105195A CN1103287C CN 1103287 C CN1103287 C CN 1103287C CN 98105195 A CN98105195 A CN 98105195A CN 98105195 A CN98105195 A CN 98105195A CN 1103287 C CN1103287 C CN 1103287C
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Abstract
The present invention relates to a method for prolonging the service life of a hot bubble type ink jet print head. The method comprises the following procedures: designing a double-pulse voltage stage; analyzing the influences of various parameters of the double pulse; finding a group of parameters which can effectively prolong the service life of the hot bubble type ink jet print head. The double-pulse parameters comprise the width of a first pulse, the voltage of the first pulse, the width of the second pulse, the voltage of the second pulse, and delay time between the second pulse and the first pulse.
Description
Technical field
The present invention relates to a kind of hot bubble type ink jet print head method in service life that prolongs, particularly relate to a kind of influence that utilizes field Kou Shi analytical to conclude the various parameters of dipulse, and find out one group can increase effectively hot bubble type ink jet promptly service life parameter method.
Background technology
At present general hot bubble type (Thermal Bubble) ink-jet printer all is to supply pulse on the heater of printhead, make the ink (Ink) on heating resistor surface produce bubble (Bubble), and ink extruding is ejected on the paper, but because the bubble of heater surfaces disappears when breaking fully, the instantaneous pressure that the ink backfill is produced can make heater surfaces impaired, and reduce its service life, so, just can increase the service life (Life time) of ink-jet printing head (Ink-Jet Printhead) if can slow down the destruction of this instantaneous pressure to heater surfaces.
Summary of the invention
Thus, main purpose of the present invention provides a kind of hot bubble type ink jet print head method in service life that prolongs, and makes the lengthening in service life of at present general hot bubble type ink jet print head, still keeps original print quality simultaneously.
For reaching above-mentioned and other purposes of the present invention, a kind of hot bubble type ink jet print head method in service life that prolongs is proposed, described method comprises the voltage kenel that designs a dipulse, and analyze the influence of the various parameters of described dipulse, find out one group and can prolong the described hot bubble type ink jet print head parameter in service life effectively, the parameter of described dipulse comprises: the width of first pulse, and it approximately is 1～5 μ s; The voltage of first pulse, it approximately is 15～25V; The width of second pulse, its scope is greater than the width of described first pulse and less than 6 μ s; The voltage of second pulse, its scope greater than described first pulse voltage 1/3rd and also less than 4/5ths of described first pulse voltage; And second the time delay between pulse and first pulse, its scope approximately is 5～20 μ s.
Description of drawings
For above-mentioned and other purposes of the present invention, characteristics and advantage can be become apparent, a preferred embodiment cited below particularly, and conjunction with figs. elaborates, wherein:
Fig. 1 is known a kind of schematic diagram that can produce the PW-PV critical curve of ink droplet just;
Fig. 2 is known a kind of schematic diagram that can produce the PV-PW critical curve of bubble just;
Oscillogram and the bubble volume and the time relation schematic diagram of pulse width and pulse voltage when Fig. 3 A and Fig. 3 B are known a kind of pulses;
Fig. 4 is the factorial effect schematic diagram in service life when according to dipulse of the present invention printhead not being had nozzle piece; And
Fig. 5 is the factorial effect schematic diagram in service life when according to dipulse of the present invention printhead being contained nozzle piece.
The specific embodiment
At first, illustrate basic theories notion of the present invention.Theoretical foundation of the present invention is that first bubble is not also before the complete obiteration, volume is less, life period is long, slow bubble disappears to produce one, the instantaneous pressure that the ink backfill is produced during with the cushion gas follicular rupture is to the destruction of heater surfaces, reduce the loss of heater surfaces, increase the service life of ink-jet printing head.
According to above-mentioned basic conception, the emphasis of the present invention research is to inquire into the influence of various waveform parameters of dipulse and the method that how to design a dipulse.If it is improper to design, can makes heater produce high temperature and also more easily be damaged, or cause unsettled ink droplet shape, thereby reduce print quality.At present general added its pulse width of single pulse of hot bubble type ink jet printer (as HP) (Pulse Width; PW) be 3 μ s, pulse voltage (Pulse Voltage; PV) be 18V, bubble produces since 2 μ s, bubble volume maximum when 7～8 μ s, bubble collapse when 16～20 μ s.Produce and situation about disappearing according to above pulse bubble, can adjust five parameters of following dipulse:
The width of PW1-------first pulse
The voltage of PV1-------first pulse
The width of PW2-------second pulse
The voltage of PV2-------second pulse
Time delay between Delay Time (D-T)--second pulse and first pulse
At first, please refer to Fig. 1, what Fig. 1 illustrated is a kind of schematic diagram that can produce the PW-PV critical curve of ink droplet just, details are as follows for the waveform of its first pulse (PW1 and PV1): because the bubble that first pulse produced is for wanting squeezeout ink to spray from nozzle, so the size of PW1 and PV1 must produce a bubble that is enough to ink extruding ejection at heater surfaces, so can produce the PW-PV critical curve of ink droplet just according to Fig. 1, PW then, the scope of choosing of PV is the above bent territory of critical curve in the drawings, for example: if with PV1=18V PW 〉=1.4 μ s then.In addition, owing to be the kenel of dipulse, first pulse and second pulse all can provide heat energy, do not produce too much heat so do not wish first pulse meeting, condition when therefore PW1 should be less than the pulse operate as normal, for example above-mentioned HP hot bubble type ink jet printer, PV=18V, PW=3 μ s, i.e. PW1≤3 μ s.Comprehensive above-mentioned discussion, the gained result is: " 1.4 μ s≤PW1 during PV1=18V≤3 μ s ".
Secondly, please refer to Fig. 2, what Fig. 2 illustrated is a kind of schematic diagram that can produce the PV-PW critical curve of bubble just, details are as follows for the waveform of its second pulse (PW2 and PV2): because second pulse is the destruction of the generation one bubble instantaneous pressure that the ink backfill is produced during with the cushion gas follicular rupture to the hot heater surface, and the generation of this bubble does not influence the ink-jet quality, such as droplet profile, liquid drop speed, character such as drop size, so to PW2, the requirement of PV2 is " can make heater surfaces produce bubble ", but this bubble is not sufficient to ink is released nozzle, so according among Fig. 2 to PW2, the scope of choosing of PV2 should be in the drawings the bent territory of oblique line, wherein solid line is for producing the PW-PV critical curve of bubble just, and dotted line is for producing the PW-PV critical curve of ink droplet ejection just.
Then, is described in detail in detail: because when heater is covered by bubble fully the time delay (Delay Time) between the dipulse, air on the heater is very low because of its coefficient of heat conduction (Thermal Conductor Coeffcient), be almost the coefficient of heat conduction of heat insulation layer, make the heat of heater can't be passed to ink, so the heat energy that is added in during this period on the heater can make the temperature of heater sharply rise, and makes the thermal stress effects of each layer film of heater more obvious, so that easier damage; The time that can not dissipate fully time delay while greater than the bubble that first pulse produced, otherwise the instantaneous pressure that first bubble is produced when breaking has acted on the heater, second bubble that pulse produced do not cushion the effect of instantaneous pressure, increase the heating number of times of heater on the contrary, reduce its service life.So first pulse with should drop on the time delay between second pulse the bubble that produces by first pulse begin to disappear when partly contacting (be heater surfaces begin to have) with ink to the bubble complete obiteration, please refer to Fig. 3 A and Fig. 3 B.In addition after first pulse, when adding second pulse again through one period time delay, temperature on the heater surfaces is not got back to room temperature yet fully, so the scope of choosing of above-mentioned PV2 and PW2 should moderately offset downward according to the surface temperature of the big or small corresponding heater of time delay.
Five parameters (PV1, PW1, PV2, PW2 and D-T) selection principle by above-mentioned dipulse, the present invention makes the dipulse of two groups of different shapes, please refer to table 1A～1B and table 2A～2B, this table is designed according to field Kou Shi analytic approach, table 1A is each parameter value of bubble dipulse of the present invention, in the bubble experiment of table 1B according to the design of field Kou Shi analytic approach, line number and pairing factor data table; Table 2A is each parameter value of ink droplet dipulse of the present invention, and table 2B is the factor data table by line number and pairing in the designed ink droplet experiment of field Kou Shi analytic approach.It is applied to following " bubble experiment (Open Pool Testing) " respectively and tests with the service life of " ink droplet experiment (Close Pool Testing) " two class print head heaters.
Table 1A (PV1=18V)
| Parameter | (1) | (2) | (3) |
| A.PW1(μs) | 2 | 2.5 | 3 |
| B.PV2(vs) | 8 | 11 | 14 |
| C.PW2(μs) | 2 | 3 | 4 |
| D.D-T(μs) | 9 | 13 | 18 |
Table 1B (the unit of PW1, PW2, D-T: μ s)
| Parameter | PW1(A) | PV2(B) | PW2(C) | D-T(D) |
| 1 | 1(2.0) | 1(8V) | 1(2) | 1(9) |
| 2 | 1(2.0) | 2(11V) | 2(3) | 2(13) |
| 3 | 1(2.0) | 3(14V) | 3(4) | 3(18) |
| 4 | 2(2.5) | 1(8V) | 2(3) | 3(18) |
| 5 | 2(2.5) | 2(11V) | 3(4) | 1(9) |
| 6 | 2(2.5) | 3(14V) | 1(2) | 2(13) |
| 7 | 3(3.0) | 1(8V) | 3(4) | 2(13) |
| 8 | 3(3.0) | 2(11V) | 1(2) | 3(18) |
| 9 | 3(3.0) | 3(14V) | 2(3) | 1(9) |
Table 2A (PV1=18V)
| Parameter | (1) | (2) | (3) |
| A.PW1(μs) | 2 | 2.5 | 3 |
| B.PV2(vs) | 8 | 11 | 14 |
| C.PW2(μs) | 2 | 3 | 4 |
| D.D-T(μs) | 9 | 12 | 16 |
Table 2B (the unit of PW1, PW2, D-T: μ s)
| Parameter | PW1(A) | PV2(B) | PW2(C) | D-T(D) |
| 1 | 1(2.0) | 1(8V) | 1(2) | 1(9) |
| 2 | 1(2.0) | 2(11V) | 2(3) | 2(12) |
| 3 | 1(2.0) | 3(14V) | 3(4) | 3(16) |
| 4 | 2(2.5) | 1(8V) | 2(3) | 3(16) |
| 5 | 2(2.5) | 2(11V) | 3(4) | 1(9) |
| 6 | 2(2.5) | 3(14V) | 1(2) | 2(12) |
| 7 | 3(3.0) | 1(8V) | 3(4) | 2(12) |
| 8 | 3(3.0) | 2(11V) | 1(2) | 3(16) |
| 9 | 3(3.0) | 3(14V) | 2(3) | 1(9) |
The comprehensive printhead of being observed is divided into two classes: one for going up the complete ink gun (ink droplet experiment) of printer, and another then takes off nozzle piece (bubble experiment).The ink droplet experiment can also can be observed from screen is clear when the ink-jet quality deterioration from the forming process of the screen observation ink droplet that CCD connected; Bubble experiment is that the ink gun after nozzle piece is taken off stands upside down and drips and goes up transparent water, from top observation, can be from the growth situation of bubble on the screen observation heater, and can know the damage process of observation heater.These two kinds of tests all connect one and can read the counter that heater is finished the ink-jet cycle times, with the index of this numerical value as service life (Life Time).Relatively " ink droplet experiment " and " bubble experiment " two kinds of tests, because when containing nozzle piece, the bubble of heater surfaces retreats to fully and breaks, when the instantaneous pressure source ratio that the ink backfill is produced takes off nozzle piece away from heater surfaces, so, the bubble experiment is tested its easier quilt than ink droplet and is damaged, and service life is shorter.
The analysis-by-synthesis test result, condition and situation in the time of at first need understanding general printhead operate as normal are to compare in contrast; With regard to HP hot-bubble ink-jetting typewriter (Thermal Ink-Jet Pinter) 51626A type, added single impulsive condition is: PV=18V, PW=3 μ s, the ink droplet diameter that is produced is 60.5 μ m, jet speed is 11m/sec, and with the test of above-mentioned two kinds of metering systems, be respectively 3.4 * 10 its service life
8Inferior (ink droplet experiment), 2.6 * 10
8Inferior (bubble experiment).
Equally with the ink jet-print head of HP51626A type as the test specimens head, please refer to table 3, the bubble experiment is to be the experimental result of test parameter with table 1B in the table 3, the ink droplet experiment is to be the experimental result of test parameter with table 2B; The major part as a result of these two groups tests is less than the service life under the above-mentioned normal running conditions, but the service life that wherein respectively has one group is greater than the service life under the above-mentioned normal running conditions, as seen the parameter of dipulse is chosen and is arranged in pairs or groups extremely important, otherwise the instantaneous pressure that is produced when not only not reducing the ink backfill is to the destruction of heater, increase the temperature of heater on the contrary, make each layer film thermal stress effects obvious, so that service life is shorter.
Table 3
| Experiment numbers | Bubble result of experiment (observation) | Ink droplet result of experiment (observation) | ||
| Service life (inferior) | η(S/N) | Service life (inferior) | η(S/N) | |
| 1 | 1.0×10 8 | -80.00 | 3.43×10 8 | -85.35 |
| 2 | 1.2×10 8 | -80.61 | 3.18×10 8 | -85.02 |
| 3 | 3.4×10 8 | -85.30 | 4.75×10 8 | -86.77 |
| 4 | 1.9×10 7 | -72.99 | 1.50×10 8 | -81.76 |
| 5 | 5.8×10 7 | -77.63 | 2.08×10 8 | -83.18 |
| 6 | 7.5×10 7 | -78.75 | 2.50×10 8 | -83.98 |
| 7 | 2.0×10 7 | -73.01 | 7.41×10 7 | -78.70 |
| 8 | 6.0×10 6 | -67.78 | 1.02×10 7 | -70.09 |
| 9 | 2.2×10 7 | -73.42 | 9.02×10 7 | -79.55 |
This two groups of result of experiment separately are discussed: 1. bubble experiment (Open Pool Testing) then,
Can find out from the factorial effect of Fig. 4, " service life " is prolonged, then PW1 is unsuitable excessive in the design of dipulse, but will make the heating element surface produce bubble at least releases ink, PW2, PV2 should not be too little, at least to make second bubble that pulse produced enough big, the effect that the instantaneous pressure that is produced during the backfill of available buffer ink destroys heater, as if the influence as for time delay not too obvious, this means if time delay the scope chosen be that the bubble that produces in first pulse begins to disappear to the bubble mistake of dissipating fully, so be not the main factor that influences service life time delay, impact effect is apparent that PW1 most, next is PW2 and PV2, is time delay at last.2. ink droplet experiment (Close Pool Testing):
From factorial effect and above-mentioned Fig. 4 of Fig. 5 similar result is arranged, PW1 influences the most tangible parameter, is PV2 secondly, and PW2 and time delay, the effect of (D-T) was suitable, and its influence is all not obvious.
According to above-mentioned interpretation, from these two kinds of tests, respectively get the test that one group of most preferred condition continues to do service life, be respectively: 1. bubble experiment: PW1=2 μ s, PV2=14V, PW2=4 μ s, time delay
Delay Time=13 μ s, service life Life Time=3.4 * 10
8Inferior.2. ink droplet experiment: PW1=2 μ s, PV2=14V, PW2=4 μ s, time delay Delay
Time=12 μ s; Service life Life Time=4.8 * 10
8Inferior.Service life when its result uses single pulse than this printhead is big.Simultaneously the condition of this dipulse is done the ink-jet test, its ink-jet situation is similar to the situation of the single pulse of operate as normal, and drop speeds (approximately 14m/sec) and droplet size (about 65 μ m) are also suitable, so dipulse can't change the ink-jet quality, and can increase the service life of ink gun.In sum, purpose of the present invention is exactly to utilize the method for dipulse, to scheme to increase the service life of ink gun.Result of study shows, can increase service life if select suitable parameter; Otherwise, select unsuitable parameter reduction of service life or disturb the ink droplet form of ink-jet significantly.Therefore the present invention utilizes the influence of field Kou Shi analytic approach by the various parameters of conclusion pulse, successfully finds out one group of parameter that can increase service life effectively.
Though below disclosed the present invention in conjunction with a preferred embodiment; but it is not in order to limit the present invention; those skilled in the art; in the spirit and scope of the present invention of disengaging are arranged; can make various changes and retouching, so protection scope of the present invention should be limited by appending claims.
Claims (2)
1. one kind prolongs the hot bubble type ink jet print head method in service life, described method comprises the voltage kenel that designs a dipulse, and analyze the influence of the various parameters of described dipulse, find out one group and can prolong the described hot bubble type ink jet print head parameter in service life effectively, the parameter of described dipulse comprises:
The width of first pulse, it approximately is 1～5 μ s;
The voltage of first pulse, it approximately is 15～25V;
The width of second pulse, its scope is greater than the width of described first pulse and less than 6 μ s;
The voltage of second pulse, its scope greater than described first pulse voltage 1/3rd and also less than 4/5ths of described first pulse voltage; And
Time delay between second pulse and first pulse, its scope approximately is 5～20 μ s.
2. the method for claim 1, wherein said method comprises the voltage kenel that designs several pulses.
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| CN98105195A CN1103287C (en) | 1998-03-31 | 1998-03-31 | Method of prolonging the service life of hot bubble type ink jet print head |
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| CN98105195A CN1103287C (en) | 1998-03-31 | 1998-03-31 | Method of prolonging the service life of hot bubble type ink jet print head |
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| CN1103287C true CN1103287C (en) | 2003-03-19 |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4972211A (en) * | 1986-06-20 | 1990-11-20 | Canon Kabushiki Kaisha | Ink jet recorder with attenuation of meniscus vibration in a ejection nozzle thereof |
| US5204695A (en) * | 1987-04-17 | 1993-04-20 | Canon Kabushiki Kaisha | Ink jet recording apparatus utilizing means for supplying a plurality of signals to an electromechanical conversion element |
| US5305024A (en) * | 1990-02-02 | 1994-04-19 | Canon Kabushiki Kaisha | Recording head and recording apparatus using same |
-
1998
- 1998-03-31 CN CN98105195A patent/CN1103287C/en not_active Expired - Lifetime
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4972211A (en) * | 1986-06-20 | 1990-11-20 | Canon Kabushiki Kaisha | Ink jet recorder with attenuation of meniscus vibration in a ejection nozzle thereof |
| US5204695A (en) * | 1987-04-17 | 1993-04-20 | Canon Kabushiki Kaisha | Ink jet recording apparatus utilizing means for supplying a plurality of signals to an electromechanical conversion element |
| US5305024A (en) * | 1990-02-02 | 1994-04-19 | Canon Kabushiki Kaisha | Recording head and recording apparatus using same |
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| CN1230490A (en) | 1999-10-06 |
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