CN1103289C - Device and method for measuring frequency response of ink drops - Google Patents
Device and method for measuring frequency response of ink drops Download PDFInfo
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- CN1103289C CN1103289C CN98124127A CN98124127A CN1103289C CN 1103289 C CN1103289 C CN 1103289C CN 98124127 A CN98124127 A CN 98124127A CN 98124127 A CN98124127 A CN 98124127A CN 1103289 C CN1103289 C CN 1103289C
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Abstract
The present invention relates to a measuring device for the frequency response of ink droplets, which is installed at the front of a jet hole sheet of an ink jet printing head and is used for detecting the actual ink jet frequency of the ink jet printing head. The device comprises a metal sensing board, an insulating layer, a magnetic loop and a signal leading-out line, wherein the metal sensing board is positioned at the front of a jet hole sheet; the insulating layer is positioned between the metal sensing board and the jet hole sheet; the magnetic loop is coupled with one surface of the metal sensing board and is perpendicular to the metal sensing board; the signal leading-out line is coupled with the lower end of the metal sensing board. The present invention also relates to a measuring method for the frequency response of ink droplets.
Description
Technical field
The present invention relates to a kind of measurement mechanism and method thereof of frequency response of ink drops, and particularly relate to the device and method that a kind of utilization " magnetoelectricity method " is measured the frequency response of ink-jet printing head generation ink droplet.
Background technology
Ink-jet printer in the market is universalness more and more, and technology is also quite progressive.Ink-jet printer is to finish print job by ink-jet printing head basically, its basic function is that the electric energy that will import ink-jet printing head is sent to electric energy the thermoelectric resistance layer with heater function via its inner circuit loop, and convert electric energy to heat energy, make the ink vaporization produce bubble, growth by bubble provides the formation ink droplet required energy, it is sprayed by spray nozzle sheet, reach the purpose of printing.
For improving the print speed of ink-jet printing head, when the design ink-jet printing head, can focus on increases the frequency response that ink-jet printing head produces ink droplet, and therefore how measuring the frequency response that produces ink droplet just becomes a kind of important technology, and its result can be as the index of ink-jet printing head print speed.The measuring method of frequency response of ink drops is to detect the actual ink-jet number of times of ink-jet printing head earlier, and then drive number of times with the actual ink-jet that puts on the ink-jet printing head and compare, just can learn whether the ink-jet number of times can mate fully with the driving number of times under various driving frequency, and then learn the frequency response limit of this ink-jet printing head.Yet because the generation frequency of ink droplet is about thousands of hertz, even tens of kilo hertzs, so general image display system does not apply and uses, but then its cost is too expensive again if use high-speed motion picture camera, therefore develops the frequency response measurement device and method that some are applicable to ink-jet printing head generation ink droplet, as United States Patent (USP) the 4th, 484,199,4,590, No. 482.
Please refer to Fig. 1, what it illustrated is a kind of generalized section of frequency response of ink drops measurement mechanism of prior art.Before the metal spray nozzle sheet 100 of ink-jet printing head, install the sensing electrode plate 106 that a slice is parallel to metal spray nozzle sheet 100 additional, and between metal spray nozzle sheet 100 and sensing electrode plate 106, apply voltage.Because metal spray nozzle sheet 100 is minimum with the spacing of sensing electrode plate 106, its spacing is less than 100 μ m, but metal spray nozzle sheet 100 does not contact with sensing electrode plate 106, when ink droplet 104 sprays from spray orifice 102, when ink droplet 104 tail ends also do not break away from metal spray nozzle sheet 100 fully, ink droplet 104 front ends have touched sensing electrode plate 106, make conducting between metal spray nozzle sheet 104 and the sensing electrode plate 106.Therefore change by the electronic signal between metal spray nozzle sheet 100 and the sensing electrode plate 106 and just can detect actual ink-jet number of times.
Yet because the gap of metal spray nozzle sheet 100 and sensing electrode plate 106 is less than 100 μ m, when testing, be easy to generate long-pending black phenomenon, thereby influence signal between metal spray nozzle sheet 100 and the sensing electrode plate 106, even make between metal spray nozzle sheet 100 and the sensing electrode plate 106 and to continue conducting and can't measure the variation of electronic signal, cause measuring the frequency response that ink-jet printing head produces ink droplet really.
Please refer to Fig. 2, what it illustrated is the generalized section of the frequency response of ink drops measurement mechanism of another kind of prior art.Before the metal spray nozzle sheet 200 of ink-jet printing head, install the sensing electrode plate 206 that a slice is parallel to metal spray nozzle sheet 200 additional, and between metal spray nozzle sheet 200 and sensing electrode plate 206, add one group of high-field electrode 208, and on high-field electrode 208, apply high voltage generation high voltage electric field.After ink droplet 204 is by spray orifice 202 ejections, can make ink droplet 204 electrically charged during by high voltage electric field.And charged ink droplet 204 can be beaten at last on sensing electrode plate 206, is changed to detect actual ink-jet number of times by the electronic signal on the sensing electrode plate 206.
Yet because the volume of ink droplet 204 is very little, be about 100 skin liters (pico-Liter, pl), when ink droplet 204 during greater than 1000 volts high voltage electric field, can be split into many littler ink droplets by voltage.These little ink droplets are beaten when the sensing electrode plate, can produce many noises, thereby can't measure the ink droplet generation number of times of ink-jet printing head reality.
Summary of the invention
Therefore main purpose of the present invention is to provide a kind of measurement mechanism and method thereof of frequency response of ink drops, can detect the number of times of the actual ejection of ink-jet printing head ink droplet exactly, driving number of times with the actual ink-jet that puts on ink-jet printing head again compares mutually, can learn whether the ink-jet number of times can mate fully with the driving number of times under various driving frequency, and then learn the frequency response of ink drops limit of ink-jet printing head.
According to an aspect of the present invention, a kind of measurement mechanism of frequency response of ink drops is provided, a spray nozzle sheet that is installed in an ink-jet printing head is exerted pressure before and to this spray nozzle sheet, in order to detect the actual ink-jet number of times of this ink-jet printing head, this device comprises: a metal sensory panel, be positioned at before this spray nozzle sheet, and have the structure that rapid guiding one ink droplet is slipped over by this metal sensory panel surface vertical with this spray nozzle sheet; One insulating barrier between this metal sensory panel and this spray nozzle sheet, and has and will remain on the thickness that this ink droplet can be led to this metal sensory panel smoothly between this spray nozzle sheet and this metal sensory panel; One magnet ring has an opening, and this opening and this surface couple, and wherein, plane that this magnet ring constitutes is parallel with this spray nozzle sheet and vertical with this surface; And a signal lead-out wire, be coupled to the opposite side between this spray orifice and this magnet ring on this metal sensory panel, wherein, this signal lead-out wire changes the signal on this metal sensory panel guides out with the actual ink-jet number of times foundation as this ink-jet printing head.
According to a further aspect in the invention, provide a kind of measuring method of frequency response of ink drops, in order to detect the actual ink-jet number of times of an ink-jet printing head, this method comprises: the spray nozzle sheet at this ink-jet printing head applies voltage; Spray an ink droplet by this spray nozzle sheet, when the front end of this ink droplet contacts with one first device, this spray nozzle sheet, this ink droplet and this first device form a loop and produce a loop current, when this ink droplet tail end leaves this spray nozzle sheet, this spray nozzle sheet and this first device back form one and open circuit, wherein this loop current produces an induced field, and this first is installed on the induced-current that this back of opening circuit produces this induced field of opposing; Current signal on this first device is led to one second device, to judge the ink-jet number of times of this ink-jet printing head by this current signal.
According to the measurement mechanism and the method thereof of frequency response of ink drops of the present invention, utilize " magnetoelectricity method " and use metal sensory panel and magnet ring, can measure accurately the frequency response that ink-jet printing head produces ink droplet, to know the limit of its frequency response.
Description of drawings
For above-mentioned and other purposes of the present invention, feature and advantage can be become apparent, a preferred embodiment cited below particularly, and conjunction with figs. elaborates in the accompanying drawing:
Fig. 1 illustrates a kind of generalized section of frequency response of ink drops measurement mechanism of prior art;
Fig. 2 illustrates the generalized section of the frequency response of ink drops measurement mechanism of another kind of prior art;
Fig. 3 A illustrates according to a preferred embodiment of the present invention, a kind of side view of frequency response of ink drops measurement mechanism;
Fig. 3 B illustrates according to a preferred embodiment of the present invention, a kind of vertical view of frequency response of ink drops measurement mechanism;
Fig. 4 illustrates according to a preferred embodiment of the present invention, a kind of schematic diagram of frequency response of ink drops measurement mechanism;
Fig. 5 illustrates according to a preferred embodiment of the present invention, the measured signal waveforms of a kind of frequency response of ink drops measurement mechanism;
Fig. 6 illustrates according to a preferred embodiment of the present invention, the signal waveforms that a kind of frequency response of ink drops measurement mechanism is actual measured; And
Fig. 7 illustrates according to a preferred embodiment of the present invention, a kind of signal processing flow figure of frequency response of ink drops measurement mechanism.
The specific embodiment
Please refer to Fig. 3 A, Fig. 3 B and Fig. 4, what it illustrated is respectively according to the preferred embodiments of the present invention, a kind of side view of frequency response of ink drops measurement mechanism, vertical view and schematic diagram.This frequency response of ink drops measurement mechanism is made of metal sensory panel 306 and magnet ring 308.Because the ink droplet frequency that will detect is about thousands of conspicuous, even tens of kilo hertzs, for when carrying out the frequency response of ink drops measurement, can be smoothly with ink droplet 304 guiding metal sensory panel 306 belows and the long-pending China ink of eliminating, therefore adopting can be rapidly with the material structure and the shape of ink droplet 304 directed stream to metal sensory panel 306 belows, the metal sensory panel 306 that for example has metal net shaped structure, or metal sensory panel 306 lower ends are designed to have sharp-pointed shape etc., when ink comes together in metal sensory panel 306 belows when being accumulated into bigger ink droplet 304a, just can drip naturally.
Shown in Fig. 3 B, magnet ring 308 has magnet ring opening 318, and with magnet ring opening 318 towards metal sensory panel 306, utilize the both sides of magnet ring opening 318 and the surface of metal sensory panel 306 to couple, and magnet ring 308 is perpendicular to metal sensory panel 306 surfaces.The material of magnet ring 308 comprises that the formed thickness of Alperm thin plate that uses the ferromagnetism body is about the lamination sheet of 0.3mm, for example use and be about 78% nickel (Nickel by percentage by weight, Ni) be about 22% iron (Iron, Fe) alloy that is constituted with percentage by weight.In addition, the material of magnet ring 308 also comprises ferrite (Ferrite), sendust (Sandust) etc.The induction magnetic gap of magnet ring 308 (Air Gap) is about 100 μ m to 150 μ m.
As shown in Figure 4, above metal sensory panel 306, has insulating barrier 310, its position avoids metal sensory panel 306 and spray nozzle sheet 300 to produce unnecessary conducting between the metal spray nozzle sheet 300 of metal sensory panel 306 and ink-jet printing head, and the thickness of insulating barrier is about 10 μ m to 100 μ m.When this measurement mechanism surperficial when mobile at metal spray nozzle sheet 300, insulating barrier 310 can make between metal sensory panel 306 and the metal spray nozzle sheet 300 and be maintained fixed spacing, and its spacing less than ink droplet 304 by the spray orifice 302 ejection back distance that ink droplet 304 front ends are flown when ink droplet 304 tail ends break away from metal spray nozzle sheet 300, otherwise can't be connected and conducting by ink droplet 304 between metal spray nozzle sheet 300 and the metal sensory panel 306.
Having signal lead-out wire 312 below metal sensory panel 306 couples mutually with metal sensory panel 306, export other signal processing apparatus in order to the signal variation that ink droplet 304 is caused on metal sensory panel 306, after the number of signals value, promptly can accurately learn actual ink-jet number of times.In addition, also have magnet ring holder 314 and support arm 316 on metal sensory panel 306, its middle magnetic ring holder 314 is in order to fixing magnet ring 308, and support arm 316 is then in order to support and mobile entire measuring device.
Basic principle of the present invention abbreviates " magnetoelectricity method " as, when carrying out the measurement of frequency response of ink drops, as shown in Figure 3A, metal spray nozzle sheet 300 is applied voltage via the probe that contacts with metal spray nozzle sheet 300 (show and be shown among the figure), its voltage is about 30 volts, and current maxima is about 100 milliamperes.When ink droplet 304 by spray orifice 302 ejection, and ink droplet 304 tail ends are not when also breaking away from metal spray nozzle sheet 300 fully, ink droplet 304 front ends have touched metal sensory panel 306, make conducting between metal spray nozzle sheet 300 and the metal sensory panel 306.Form a loop because metal spray nozzle sheet 300 connect via ink droplet 304 with 306 moments of metal sensory panel this moment, so metal sensory panel 306 can the variations of generation electric currents, its loop current is I.
According to Lenz's law (Lenz ' s Law), the formation of loop electric current I can produce induced field on the metal sensory panel 306, and the magnetic conduction substance that the part magnetic line of force of induced field can be coupled on the magnet ring 308 of metal sensory panel 306 absorbs.Because the direction of loop current I is to be parallel to metal sensory panel 306, then can be by the induced field that loop current I is produced perpendicular to metal sensory panel 306, so magnet ring 308 must just can make the magnetic conduction substance that constitutes magnet ring 308 absorb the magnetic line of force effectively perpendicular to metal sensory panel 306.
Break away from gradually in the process of metal spray nozzle sheet 300 at ink droplet 304, loop current I and induced field also change thereupon.When ink droplet 304 tail ends break away from metal spray nozzle sheet 300 fully, because the variation of loop current I according to Lenz's law, can produce induced-current I ' on the metal sensory panel 306, with the change of induced field on the opposing magnet ring, wherein loop current I is identical with the sense of current of induced-current I '.Therefore, when ink droplet 304 after metal spray nozzle sheet 300 ejection, via the signal lead-out wire 312 that metal sensory panel 306 is drawn, can record the time dependent signal of voltage on the metal sensory panel 306.
Please refer to Fig. 5, what it illustrated is according to the preferred embodiments of the present invention, the measured signal waveforms of a kind of frequency response of ink drops measurement mechanism.The transverse axis representative is the time among the figure, and longitudinal axis representative is voltage, and signal mainly can be divided into two parts: preceding segment signal and back segment signal.Before segment signal be when connecting the formation loop via ink droplet 304 between metal spray nozzle sheet 300 and the metal sensory panel 306, I is caused by loop current, therefore before the ripple of segment signal wide promptly be that ink droplet 304 leading portions begin contacting metal sensory panel 306 to ink droplet 304 tail ends and begin to break away from gradually time between the metal spray nozzle sheet 300, just the leading portion signal time 500.When wherein the sectional area that contacts with metal spray nozzle sheet 300 of ink droplet 304 tail ends is maximum, for ink droplet 304 begins to break away from the zero-time of metal spray nozzle sheet 300 that is leading portion signal termination time.
Back segment signal is caused for the variation of resisting induced field makes metal sensory panel 306 produce induced-current I ' by magnet ring 308, so induced-current I ' is identical with the sense of current of loop current I.Then the ripple of segment signal is wide begins to break away from the time that spray nozzle sheet 300 to ink droplet 304 breaks away from spray nozzle sheet 300 fully for ink droplet 304, that is back segment signal time 502.When ink droplet 304 tail ends break away from metal spray nozzle sheet 300 fully, between metal sensory panel 306 and the metal spray nozzle sheet 300 no longer conducting and forming open circuit.
Because induced-current I ' is identical with the sense of current of loop current I, and the variation of the induced-current I ' that is caused because of magnet ring 308 comparatively relaxes, so afterwards segment signal 502 is detected quite easily.Otherwise, if magnet ring 308, the signal that then measured signal is only caused by loop current I are not installed.And begin to break away from spray nozzle sheet 300 at ink droplet 304 and break away from fully to ink droplet 304 in the time of spray nozzle sheet 300, very short sudden by the signal that loop current I is caused, so be difficult for detecting.
According to above-mentioned " magnetoelectricity method ", the frequency that ink-jet printing head is produced ink droplet under the different driving frequency is measured, and ink droplet of the every generation of spray orifice can obtain as the signal among Fig. 5.Please refer to Fig. 6, what it illustrated is according to the preferred embodiments of the present invention, the signal waveforms that a kind of frequency response of ink drops measurement mechanism is actual measured.The transverse axis representative is the time among the figure, longitudinal axis representative be voltage, measured signal after the number of signals value, just can accurately be learnt actual ink-jet number of times as shown in Figure 6 under the continous inkjet state.Compare with the actual driving ink-jet number of times that puts on ink-jet drive plate on the ink-jet printing head again, can learn whether the ink-jet number of times can mate fully with the driving number of times under various driving frequency, and then accurately learn the frequency response limit of ink-jet printing head.
Please refer to Fig. 7, what it illustrated is according to a preferred embodiment of the present invention, a kind of signal processing flow figure of frequency response of ink drops measurement mechanism.By the signal lead-out wire 312 that metal sensory panel 306 is drawn signal is exported, through the electrostatic field processor signal is carried out preliminary treatment, eliminate noise by wave filter (Filter) and retriever again,, on display, show the actual ink-jet number of times that is detected then and then with the number of signals value.The ink-jet number of times of reality is driven the ink-jet number of times and compares mutually with putting on ink-jet printing head, can learn under various driving frequency the ink-jet number of times and drive number of times and whether can mate fully, and then learn the frequency response limit of ink-jet printing head.
Insulating barrier in the measurement mechanism of the present invention can avoid metal sensory panel and spray nozzle sheet to produce unnecessary conducting, and the metal sensory panel can be guided ink droplet rapidly and flowed to sensory panel below, so can not continue conducting and can't not detect actual ink-jet number of times because of long-pending China ink cause between metal sensory panel and spray nozzle sheet.Use magnet ring to utilize the mode of electromagnetic induction can detect current signal slight change on the metal sensory panel, therefore can really accurate actual ink-jet number of times of detecting and frequency, drive number of times and frequency ratio than the frequency response of ink drops and the limit thereof that can learn ink-jet printing head with ink-jet.
By the invention described above preferred embodiment as can be known, use the actual ink-jet number of times that the present invention can accurately detect ink-jet printing head, drive number of times relatively with the ink-jet that puts on ink-jet printing head again, then can accurately measure the frequency response of ink drops of ink-jet printing head, and can know the limit of its frequency response.
Though the present invention discloses as above in conjunction with a preferred embodiment; but it is not in order to limit the present invention; those skilled in the art can make various changes and retouching without departing from the spirit and scope of the present invention, so protection scope of the present invention should be defined by accompanying Claim.
Claims (21)
1. the measurement mechanism of a frequency response of ink drops is installed in before the spray nozzle sheet of an ink-jet printing head and to this spray nozzle sheet and exerts pressure, and in order to detect the actual ink-jet number of times of this ink-jet printing head, this device comprises:
One metal sensory panel is positioned at before this spray nozzle sheet, and has the structure that rapid guiding one ink droplet is slipped over by this metal sensory panel surface vertical with this spray nozzle sheet;
One insulating barrier between this metal sensory panel and this spray nozzle sheet, and has and will remain on the thickness that this ink droplet can be led to this metal sensory panel smoothly between this spray nozzle sheet and this metal sensory panel;
One magnet ring has an opening, and this opening and this surface couple, and wherein, plane that this magnet ring constitutes is parallel with this spray nozzle sheet and vertical with this surface; And
One signal lead-out wire is coupled to another example between this spray orifice and this magnet ring on this metal sensory panel, and wherein, this signal lead-out wire changes the signal on this metal sensory panel guides out with the actual ink-jet number of times foundation as this ink-jet printing head.
2. the measurement mechanism of frequency response of ink drops as claimed in claim 1, wherein this metal sensory panel has metal net shaped structure.
3. the measurement mechanism of frequency response of ink drops as claimed in claim 1, wherein the lower end of this metal sensory panel has sharp-pointed shape.
4. the measurement mechanism of frequency response of ink drops as claimed in claim 1, wherein the thickness of this insulating barrier is about 10 μ m to 100 μ m.
5. the measurement mechanism of frequency response of ink drops as claimed in claim 1, wherein this magnet ring has a magnet ring opening.
6. the measurement mechanism of frequency response of ink drops as claimed in claim 5, wherein this magnet ring couples with the both sides of this magnet ring opening and this surface of this metal sensory panel.
7. the measurement mechanism of frequency response of ink drops as claimed in claim 1, wherein the material of this magnet ring comprises Alperm.
8. the measurement mechanism of frequency response of ink drops as claimed in claim 7, wherein the material of this magnet ring comprises that being about 78% nickel and percentage by weight by percentage by weight is about 22% the alloy that iron constituted.
9. the measurement mechanism of frequency response of ink drops as claimed in claim 1, wherein the material of this magnet ring comprises ferrite.
10. the measurement mechanism of frequency response of ink drops as claimed in claim 1, wherein the material of this magnet ring comprises sendust.
11. the measurement mechanism of frequency response of ink drops as claimed in claim 1, wherein this signal lead-out wire is to export a plurality of signal processing apparatus in order to the signal on this metal sensory panel is changed.
12. the measurement mechanism of frequency response of ink drops as claimed in claim 11, wherein these signal processing apparatus comprise electrostatic field processor, wave filter, retriever and display.
13. the measuring method of a frequency response of ink drops, in order to detect the actual ink-jet number of times of an ink-jet printing head, this method comprises:
Spray nozzle sheet at this ink-jet printing head applies voltage;
Spray an ink droplet by this spray nozzle sheet, when the front end of this ink droplet contacts with one first device, this spray nozzle sheet, this ink droplet and this first device form a loop and produce a loop current, when this ink droplet tail end leaves this spray nozzle sheet, this spray nozzle sheet and this first device back form one and open circuit, wherein this loop current produces an induced field, and this first is installed on the induced-current that this back of opening circuit produces this induced field of opposing;
Current signal on this first device is led to one second device, to judge the ink-jet number of times of this ink-jet printing head by this current signal.
14. the measuring method of frequency response of ink drops as claimed in claim 13, wherein this first device comprises a metal sensory panel, a magnet ring and a signal lead-out wire.
15. the measuring method of frequency response of ink drops as claimed in claim 14, wherein this induced field is absorbed by this magnet ring.
16. the measuring method of frequency response of ink drops as claimed in claim 14, wherein this induced-current produces on this metal sensory panel.
17. the measuring method of frequency response of ink drops as claimed in claim 14, wherein this signal lead-out wire is in order to export this current signal.
18. the measuring method of frequency response of ink drops as claimed in claim 13, wherein this current signal comprises this loop current.
19. the measuring method of frequency response of ink drops as claimed in claim 13, wherein this current signal comprises this induced-current.
20. the measuring method of frequency response of ink drops as claimed in claim 13, wherein this second device comprises electrostatic field processor, wave filter, retriever and display.
21. the measuring method of frequency response of ink drops as claimed in claim 13 comprises also that wherein relatively the actual ink-jet number of times and the ink-jet of this ink-jet printing head drive number of times.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN98124127A CN1103289C (en) | 1998-11-10 | 1998-11-10 | Device and method for measuring frequency response of ink drops |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN98124127A CN1103289C (en) | 1998-11-10 | 1998-11-10 | Device and method for measuring frequency response of ink drops |
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| CN1253076A CN1253076A (en) | 2000-05-17 |
| CN1103289C true CN1103289C (en) | 2003-03-19 |
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| CN98124127A Expired - Lifetime CN1103289C (en) | 1998-11-10 | 1998-11-10 | Device and method for measuring frequency response of ink drops |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4484199A (en) * | 1982-03-30 | 1984-11-20 | Konishiroku Photo Industry Co., Ltd. | Method and apparatus for detecting failure of an ink jet printing device |
| US4590482A (en) * | 1983-12-14 | 1986-05-20 | Hewlett-Packard Company | Nozzle test apparatus and method for thermal ink jet systems |
| CN1142438A (en) * | 1995-07-04 | 1997-02-12 | 佳能株式会社 | Ink jet recording apparatus |
| CN1172013A (en) * | 1996-06-25 | 1998-02-04 | 三星电子株式会社 | Method for checking nozzle contact status of recording head |
-
1998
- 1998-11-10 CN CN98124127A patent/CN1103289C/en not_active Expired - Lifetime
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4484199A (en) * | 1982-03-30 | 1984-11-20 | Konishiroku Photo Industry Co., Ltd. | Method and apparatus for detecting failure of an ink jet printing device |
| US4590482A (en) * | 1983-12-14 | 1986-05-20 | Hewlett-Packard Company | Nozzle test apparatus and method for thermal ink jet systems |
| CN1142438A (en) * | 1995-07-04 | 1997-02-12 | 佳能株式会社 | Ink jet recording apparatus |
| CN1172013A (en) * | 1996-06-25 | 1998-02-04 | 三星电子株式会社 | Method for checking nozzle contact status of recording head |
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| CN1253076A (en) | 2000-05-17 |
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