WO2004035316A1 - 液体吐出装置及び液体吐出方法 - Google Patents
液体吐出装置及び液体吐出方法 Download PDFInfo
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- WO2004035316A1 WO2004035316A1 PCT/JP2003/013316 JP0313316W WO2004035316A1 WO 2004035316 A1 WO2004035316 A1 WO 2004035316A1 JP 0313316 W JP0313316 W JP 0313316W WO 2004035316 A1 WO2004035316 A1 WO 2004035316A1
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- Prior art keywords
- liquid
- discharge
- distance
- ejection
- liquid ejection
- Prior art date
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
- B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
- B41J2/01—Ink jet
- B41J2/07—Ink jet characterised by jet control
- B41J2/075—Ink jet characterised by jet control for many-valued deflection
- B41J2/08—Ink jet characterised by jet control for many-valued deflection charge-control type
- B41J2/09—Deflection means
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
- B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
- B41J2/01—Ink jet
- B41J2/015—Ink jet characterised by the jet generation process
- B41J2/04—Ink jet characterised by the jet generation process generating single droplets or particles on demand
- B41J2/045—Ink jet characterised by the jet generation process generating single droplets or particles on demand by pressure, e.g. electromechanical transducers
- B41J2/04501—Control methods or devices therefor, e.g. driver circuits, control circuits
- B41J2/04526—Control methods or devices therefor, e.g. driver circuits, control circuits controlling trajectory
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
- B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
- B41J2/01—Ink jet
- B41J2/015—Ink jet characterised by the jet generation process
- B41J2/04—Ink jet characterised by the jet generation process generating single droplets or particles on demand
- B41J2/045—Ink jet characterised by the jet generation process generating single droplets or particles on demand by pressure, e.g. electromechanical transducers
- B41J2/04501—Control methods or devices therefor, e.g. driver circuits, control circuits
- B41J2/04533—Control methods or devices therefor, e.g. driver circuits, control circuits controlling a head having several actuators per chamber
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
- B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
- B41J2/01—Ink jet
- B41J2/015—Ink jet characterised by the jet generation process
- B41J2/04—Ink jet characterised by the jet generation process generating single droplets or particles on demand
- B41J2/045—Ink jet characterised by the jet generation process generating single droplets or particles on demand by pressure, e.g. electromechanical transducers
- B41J2/04501—Control methods or devices therefor, e.g. driver circuits, control circuits
- B41J2/04558—Control methods or devices therefor, e.g. driver circuits, control circuits detecting presence or properties of a dot on paper
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
- B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
- B41J2/01—Ink jet
- B41J2/015—Ink jet characterised by the jet generation process
- B41J2/04—Ink jet characterised by the jet generation process generating single droplets or particles on demand
- B41J2/045—Ink jet characterised by the jet generation process generating single droplets or particles on demand by pressure, e.g. electromechanical transducers
- B41J2/04501—Control methods or devices therefor, e.g. driver circuits, control circuits
- B41J2/04561—Control methods or devices therefor, e.g. driver circuits, control circuits detecting presence or properties of a drop in flight
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
- B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
- B41J2/01—Ink jet
- B41J2/015—Ink jet characterised by the jet generation process
- B41J2/04—Ink jet characterised by the jet generation process generating single droplets or particles on demand
- B41J2/045—Ink jet characterised by the jet generation process generating single droplets or particles on demand by pressure, e.g. electromechanical transducers
- B41J2/04501—Control methods or devices therefor, e.g. driver circuits, control circuits
- B41J2/0458—Control methods or devices therefor, e.g. driver circuits, control circuits controlling heads based on heating elements forming bubbles
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
- B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
- B41J2/01—Ink jet
- B41J2/07—Ink jet characterised by jet control
- B41J2/125—Sensors, e.g. deflection sensors
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
- B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
- B41J2/01—Ink jet
- B41J2/135—Nozzles
- B41J2/14—Structure thereof only for on-demand ink jet heads
- B41J2/14016—Structure of bubble jet print heads
- B41J2/14032—Structure of the pressure chamber
- B41J2/1404—Geometrical characteristics
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
- B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
- B41J2/01—Ink jet
- B41J2/135—Nozzles
- B41J2/14—Structure thereof only for on-demand ink jet heads
- B41J2/14016—Structure of bubble jet print heads
- B41J2/14032—Structure of the pressure chamber
- B41J2/14056—Plural heating elements per ink chamber
Definitions
- the liquid discharge deflection amount is determined according to the distance between the liquid discharge surface of the head and the surface of the liquid discharge target on which the liquid lands, and the liquid is deflected and discharged with the determined discharge deflection amount.
- the present invention relates to a liquid discharging apparatus and a liquid discharging method as described above. Background art
- an ink jet printer has been known as an example of a liquid ejection apparatus including a head in which a plurality of liquid ejection units having nozzles are arranged in parallel.
- a thermal method in which the ink is ejected using thermal energy is known.
- the thermal type ink discharge unit As a structure of the thermal type ink discharge unit, a structure including an ink liquid chamber, a heating resistor provided in the ink liquid chamber, and a nozzle provided on the ink liquid chamber is known. Then, the ink in the ink liquid chamber is rapidly heated by the heating resistor to generate bubbles in the ink on the heating resistor, and the ink (ink droplets) is ejected from the nozzle of the ink discharge unit by the energy at the time of the bubble generation. It is to discharge.
- a serial system in which the head is moved in the width direction of the photographic paper to perform printing, and a number of heads are arranged side by side in the width direction of the photographic paper, and a line corresponding to the photographic paper width is provided.
- a line method in which a head is formed can be cited.
- the structure of the line head there is known a structure in which a plurality of small head chips are arranged side by side so that the ends are connected to each other, and the liquid ejection portions of each head chip are arranged over the entire width of the photographic paper. (For example, Japanese Patent Publication No. 2002-36522).
- misalignment due to a difference in thermal expansion coefficient between the ink liquid chamber and the heating resistor and the nozzle sheet may occur.
- Ink ejected perpendicular to the ejection surface lands at an accurate position, but if it is not ejected perpendicular to the ejection surface, an ink landing position shift occurs.
- an ink landing position shift occurs, in the case of the serial method, it appears as an ink landing pitch shift between nozzles. You. Further, in the line method, in addition to the above-mentioned landing pitch deviation, the landing position deviation between the juxtaposed heads appears.
- FIGS. 17A to 17B are diagrams showing a state in which printing is performed on printing papers P1 and P2 having different paper thicknesses while deflecting the ink ejection angle by ⁇ .
- Fig. 17 ⁇ shows that when printing on photographic paper P1, the distance from the ink ejection surface (head end of head 1) to the ink landing surface of photographic paper P1 is L1.
- the ink ejection angle is deflected by only.
- the paper thickness is different from that of the photographic paper P 1 (thicker than the paper thickness of the photographic paper P 1).
- the distance between P2 and the landing surface of the ink changes from L1 to L2 ( ⁇ L1). In this state, if the ink ejection angle is deflected by ⁇ in the same manner as described above, there is a problem that the landing position of the ink is different from that of the photographic paper # 1.
- the surface height is partially different from that of other portions, such as a sheet having a folded portion such as an envelope or tack paper.
- the surface height may not be constant as in a printed circuit board having a circuit pattern.
- the curled tip may cause the tip to have a different surface height than other parts.
- the problem to be solved by the present invention is to provide a liquid ejection section having a plurality of liquid ejection sections arranged side by side and to be able to deflect the liquid ejection direction.
- the purpose is to enable an appropriate amount of deflection to be set even when the distance between the target and the liquid landing surface changes. Second, even if the surface height of a single liquid discharge target varies, an appropriate amount of deflection can be set accordingly.
- the present invention solves the above-mentioned problems by the following means.
- the present invention provides a head in which a plurality of liquid discharge units having nozzles are arranged in parallel, and a liquid discharge direction of the liquid discharged from the nozzles of each of the liquid discharge units described above.
- a liquid discharge apparatus comprising: a discharge direction deflecting unit that deflects a liquid in a direction in which protruding portions are arranged.
- a detection unit and a discharge deflection amount determination unit that determines a discharge deflection amount of the liquid by the discharge direction deflection unit based on a detection result by the distance detection unit.
- the distance detecting means detects the distance between the liquid ejection surface of the head and the surface on which the liquid of the liquid ejection target lands. Then, based on the detection result, the ejection deflection amount determination means determines the ejection deflection amount of the liquid.
- the amount of deflection can be set appropriately.
- the present invention also provides a head in which a plurality of liquid ejection units having nozzles are arranged in parallel, and the ejection direction of the liquid ejected from the nozzles of each of the liquid ejection units is set in a plurality of directions in the arrangement direction of the liquid ejection units.
- a liquid discharge device comprising: a discharge direction deflecting unit for deflecting the liquid; a head; and a relative movement unit for relatively moving a liquid discharge target on which liquid discharged from the nozzle of each of the liquid discharge units lands.
- the liquid ejecting unit is provided on a side where the liquid ejection target is carried into the head by the relative movement unit, emits a material wave to the liquid ejection target, and discharges the liquid from the liquid ejection unit based on the received reflected wave. Detecting the distance between the surface and the liquid landing surface of the liquid discharge target, and sequentially moving the head and the liquid discharge target by the relative movement means, Distance detecting means for detecting a distance, corresponding to the distance, and a landing target position of the liquid discharged from the nozzle of the liquid discharging unit.
- the data table is determined by referring to a data table that defines a discharge deflection amount of the liquid discharged from the nozzle of the liquid discharge unit, the distance detected by the distance detection unit, and a target landing position of the liquid. And a discharge deflection amount determining means for determining a discharge deflection amount of the liquid by the discharge direction deflecting means corresponding to each of the liquid discharge units.
- the distance detecting means detects the distance between the liquid ejection surface of the head and the surface on which the liquid of the liquid ejection target lands.
- the distance detecting means detects the distance by emitting a material wave to the liquid discharge target, and sequentially detects the distance along with the relative movement between the head and the liquid discharge target.
- the distance is detected in a non-contact manner with the liquid discharge target, so that, for example, the detection can be continuously performed. Then, by detecting the distance sequentially according to the relative movement between the head and the liquid discharge target, even when a change in the distance occurs, the change can be detected immediately.
- the ejection deflection amount determining means determines the ejection deflection amount corresponding to each liquid ejection unit from the detected distance and the target landing position of the liquid with reference to the data table. Therefore, even if the distance between the liquid ejection surface of the head and the surface of the liquid ejection target on which the liquid lands is changed due to the relative movement between the head and the liquid ejection target, an appropriate The amount of deflection can be set.
- the present invention provides a head having a plurality of liquid discharge units having nozzles arranged in parallel, and a discharge direction of liquid discharged from the nozzles of each of the liquid discharge units.
- Direction deflecting means for deflecting liquid in a plurality of directions in the direction in which the liquid discharge units are arranged, the head, and a liquid discharge target for landing liquid discharged from the nozzles of each of the liquid discharge units is relatively moved.
- a liquid ejecting apparatus comprising: a liquid ejecting apparatus, comprising: a liquid ejecting apparatus including a liquid ejecting apparatus, wherein the liquid ejecting apparatus includes a liquid ejecting surface and a liquid ejecting object.
- a distance information acquiring unit that acquires distance information between the liquid landing surface and the liquid, and a distance between the liquid discharge surface of the liquid discharge unit and the liquid landing surface of the liquid discharge target;
- a data table that defines a discharge deflection amount of the liquid ejected from the nozzle of the liquid ejection unit, the data table corresponding to a landing target position of the liquid ejected from the nozzle, and the distance information acquisition unit acquires the data table. From the distance information and the target landing position of the liquid, the discharge deflection amount determining means determines the liquid discharge deflection amount by the discharge direction deflecting means corresponding to each of the liquid discharge units with reference to the data table. Means.
- the liquid ejection device uses the distance information acquisition means to correspond to the relative movement between the head and the liquid ejection target, and the liquid ejection surface of the liquid ejection unit and the liquid ejection target. Information on the distance between the object and the landing surface of the liquid is obtained. For example, there is a case where the above-mentioned distance for each position of the liquid discharge target is wide as in a printed circuit board having a circuit pattern.
- the ejection deflection amount corresponding to the distance and the target landing position of the liquid ejected from the nozzle of the liquid ejection unit is defined.
- the ejection deflection amount determining means determines the ejection deflection amount corresponding to each liquid ejection unit with reference to the data table based on the acquired distance information and the liquid landing target position. Therefore, the above distance for each position of the liquid discharge target If the separation is known, the distance between the liquid ejection surface of the head and the surface where the liquid of the liquid ejection target lands is measured without detecting the distance. It is possible to set an appropriate amount of deflection even if it changes with the relative movement of. BRIEF DESCRIPTION OF THE FIGURES
- FIG. 1 is an exploded perspective view showing a head of an ink jet printer to which a liquid ejection device according to the present invention is applied.
- FIG. 2 is a plan view and a side sectional view showing the arrangement of the heating resistors in the ink discharge section in more detail.
- FIG. 3 is a diagram illustrating deflection of the ink ejection direction.
- FIG. 4A to 4B are graphs showing the relationship between the ink bubble generation time difference of the heating resistor divided into two and the ejection angle of the ink, and FIG. 4C shows the heating resistor divided into two.
- 5 shows actual measured value data of the bubble generation time difference of the ink of FIG.
- FIG. 5 is a circuit diagram embodying the ejection direction deflecting means.
- FIG. 7 is a side view showing a schematic configuration of a printing apparatus according to the second embodiment.
- FIG. 8 is a plan view of FIG. 7 with the photographic paper transport drive system omitted.
- FIG. 9 is a front view of FIG. 8, as viewed from the side where the photographic paper is loaded into the line head.
- FIG. 10 is a side view showing the positional relationship between the line head and the sensor in more detail.
- FIG. 11 is a block diagram showing a sensor (distance detecting means), a data table, and an ejection deflection amount calculation circuit as an ejection deflection amount determining means of the second embodiment.
- FIG. 12 is a diagram for explaining the data table.
- FIG. 13 is a front view showing a state in which ink is ejected from three liquid ejection units “N ⁇ 1”, “N”, and “N + 1” in the line head.
- FIG. 14 is a side view showing an example in which the distance changes even when the printing paper does not have a convex portion.
- FIG. 15 is a diagram illustrating a third embodiment of the present invention.
- FIG. 16 is a block diagram illustrating a fourth embodiment of the present invention.
- FIGS. 17A to 17B show a state in which, in the prior art, printing was performed by deflecting the ink ejection angle by ⁇ with respect to printing papers P 1 and P 2 having different paper thicknesses.
- FIG. 1 is an exploded perspective view showing a head 11 of an ink jet printer (hereinafter, simply referred to as “printer”) to which a liquid ejection apparatus according to the present invention is applied.
- the nozzle sheet 17 is bonded on the noori layer 16, and the nozzle sheet 17 is shown in an exploded manner.
- the substrate member 14 is composed of a semiconductor substrate 15 made of silicon or the like, and a heating resistor 13 deposited and formed on one surface of the semiconductor substrate 15 (corresponding to the energy generating means in the present invention). That do).
- the heat generating resistor 13 is electrically connected to a circuit described later via a conductor (not shown) formed on the semiconductor substrate 15.
- the parier layer 16 is made of, for example, an exposure-curable dry film resist. After being laminated on the entire surface of the semiconductor substrate 15 on which the heating resistor 13 is formed, unnecessary portions are formed by a photolithography process. Is formed by the removal of
- the nozzle sheet 17 has a plurality of nozzles 18 formed therein.
- the nozzle sheet 17 is formed by nickel-based electrode technology so that the position of the nozzle 18 matches the position of the heating resistor 13. That is, the nozzle 18 is bonded on the barrier layer 16 so as to face the heating resistor 13.
- the ink liquid chamber 12 (corresponding to the liquid chamber in the present invention) is composed of a substrate member 14, a barrier layer 16 and a nozzle sheet 17 so as to surround the heat generating resistor 13. . That is, the substrate member 14 forms the bottom wall of the ink liquid chamber 12 in the figure, the barrier layer 16 forms the side wall of the ink liquid chamber 12, and the nozzle sheet 17 forms the ink liquid chamber. Make up the top wall of 12. Thereby, the ink liquid chamber 12 has an opening surface on the right front surface in FIG. 1, and the opening surface communicates with the ink flow path (not shown).
- the above-mentioned one head 11 is usually provided with a plurality of heating resistors 13 in units of 100 and an ink liquid chamber 12 provided with each heating resistor 13.
- Each of these heating resistors 13 is uniquely selected according to a command from the nozzle, and the ink in the ink liquid chamber 12 corresponding to the heating resistor 13 is discharged from the nozzle 18 facing the ink liquid chamber 12.
- An ink having a volume substantially equal to that of the displaced ink at the portion in contact with 18 is ejected from the nozzle 18 as droplets and landed on photographic paper (liquid ejection target).
- the head 11 has a plurality of ink ejection units arranged in parallel.
- a plurality of heads 11 are arranged in the photographic paper width direction to form a line head.
- one nozzle sheet 17 (all ink liquids of each head chip) is arranged.
- the nozzle 18 is formed at the position corresponding to the chamber 12) to form a line head.
- FIG. 2 is a plan view and a cross-sectional side view showing the arrangement of the heating resistors 13 in the ink ejection section in more detail.
- the nozzle 18 is shown by a one-dot chain line.
- two divided heating resistors 13 are juxtaposed in one ink liquid chamber 12. Furthermore, the arrangement direction of the two divided heating resistors 13 is the arrangement direction of the nozzles 18 (the left-right direction in FIG. 2).
- the resistance value of the heating resistor 13 is doubled. become. If the two divided heating resistors 13 are connected in series, the heating resistor 13 having twice the resistance value is connected in series. Therefore, the resistance value is quadrupled (this value is a calculated value when the distance between the heating resistors 13 arranged side by side in FIG. 2 is not considered).
- the size of a transistor or the like for flowing a current can be reduced, and space can be saved.
- the thickness of the heating resistor 13 is reduced, the resistance value can be increased.
- the resistance value of the heating resistor 13 is increased by dividing the heating resistor 13 without reducing the thickness. Also, when the heating resistor 13 divided into two is provided in one ink liquid chamber 12, the time required for each heating resistor 13 to reach the temperature at which the ink boils (bubble generation) Time) at the same time. If a time difference occurs between the bubble generation times of the two heat generating resistors 13, the ink ejection angle is not vertical, and the ink ejection direction is deflected.
- FIG. 3 is a view for explaining the ink ejection direction.
- the ink i when the ink i is ejected perpendicular to the ejection surface of the ink i (the surface of the photographic paper P), the ink i is ejected without deflection as shown by the dotted arrow in FIG. .
- the ejection direction of ink i is deflected and the ejection angle deviates by ⁇ from the vertical direction (Z1 or Z2 direction in Fig. 3), the landing position of ink i becomes
- ⁇ L HX tan 0 Will be shifted.
- the distance H indicates the distance between the tip of the nozzle 18 and the surface of the printing paper P, that is, the distance between the ink discharge surface of the liquid discharge unit and the ink landing surface (the same applies hereinafter).
- FIGS. 4A to 4B are graphs showing the relationship between the bubble generation time difference of the ink of the heating resistor 13 divided into two and the ink ejection angle, and show the simulation results by the combination. is there.
- FIG. 4C shows the horizontal axis as the deflection current, which is 1/2 of the difference in the amount of current between the heating resistors 13 divided into two as the difference in the bubble generation time of the ink in the heating resistor 13 divided into two.
- the vertical axis indicates the amount of displacement at the ink landing position (measured assuming the distance from the ink ejection surface to the landing position of the photographic paper about 2 mm) on the vertical axis.
- the main current of the heating resistor 13 was set to 80 mA, and the deflection current was superimposed on one of the heating resistors 13 to deflect the ink.
- the heating resistor 13 divided into two is provided, and by changing the amount of current flowing through each heating resistor 13, air bubbles on the two heating resistors 13 are formed.
- the discharge direction of the ink is deflected by controlling the generation time so as to cause a time difference (discharge direction deflecting means).
- the resistance value of the heating resistor 13 divided into two is not the same value due to a manufacturing error or the like, a difference occurs in the bubble generation time between the two heating resistors 13, so that the ink The ejection angle is not vertical, and the ink landing position shifts from its original position.
- the bubble generation time on each heating resistor 13 is controlled, and the bubble generation time on the two heating resistors 13 is simultaneously reduced. For example, it is possible to make the ink ejection angle vertical.
- the ink ejection direction of one or more specific heads 11 is deflected with respect to the original ejection direction, so that the ink is perpendicular to the landing surface of the printing paper due to a manufacturing error or the like. It is possible to correct the ejection direction of the head 11 that is not ejected to the ink so that the ink is ejected vertically.
- one head 11 may deflect only the ink ejection direction from one or more specific ink ejection units. For example, in one head 11, if the direction of ink discharge from a specific ink discharge unit is not parallel to the direction of ink discharge from another ink discharge unit, the specific ink discharge unit By deflecting only the direction in which the ink is ejected from the ink, it can be adjusted so as to be parallel to the direction in which the ink is ejected from the other ink ejection sections. Further, the ink ejection direction can be deflected as follows.
- the ink when ink is ejected from the ink ejection section N and the ink ejection section (N + 1) adjacent thereto, when ink is ejected from the ink ejection section N and the ink ejection section (N + 1) without deflection, respectively.
- the landing positions are the landing position n and the landing position (n + 1), respectively.
- the ink can be ejected from the ink ejection section N without deflection to land at the landing position n, and the ink discharge direction is deflected so that the ink lands at the landing position (n + 1). You can also.
- the ink can be ejected from the ink ejection section (N + 1) without deflection to land at the landing position (n + 1), and the ink can be ejected at the landing position n by deflecting the ink ejection direction. it can.
- the ink discharge section (N + 1) should be moved to the landing position (n + 1) if it should be normal. Cannot land ink, causing dot dropout, and the head 11 is regarded as defective.
- the ink ejection portion N adjacent to one side of the ink ejection portion (N + 1) or the ink ejection portion (N + 2) adjacent to the ink ejection portion (N + 1) on the other side. This deflects the ink and ejects it, making it possible to land the ink at the landing position (n + 1).
- the ejection direction deflecting means in the present embodiment includes a current mirror circuit (hereinafter, referred to as a CM circuit).
- FIG. 5 is a circuit diagram embodying the ejection direction deflecting means of the first embodiment. First, elements used in this circuit and connection states will be described.
- the resistances Rh-A and Rh-B are the resistances of the heating resistor 13 divided into two as described above, and both are connected in series. resistance
- the power supply Vh is a power supply for applying a voltage to the resistors Rh-A and Rh-B.
- transistors M1 to M21 are provided as transistors, and transistors M4, M6, M9, Mil, M14, M16, M19, and M21 are provided as transistors. It is a PMOS transistor, and the others are NMOS transistors.
- a set of CM circuits is configured by transistors M2, M3, M4, M5, and M6, and a total of four CM circuits are provided.
- the gate and drain of the transistor M6 and the gate of M4 are connected.
- the drains of the transistors M4 and M3 and the transistors M6 and M5 are connected to each other. The same applies to other CM circuits.
- drains of the transistors M4, M9, M14 and Ml9 and the drains of the transistors M3, M8, Ml3 and M18 which form part of the CM circuit are Connected to the midpoint with R h— B.
- the transistors M2, M7, M12, and M17 each serve as a constant current source of each CM circuit, and the drains thereof are M3, M8, M13, and M13, respectively. Connected to 18 sources.
- the transistor Ml has its drain connected in series with the resistor Rh-B, becomes ⁇ N when the discharge execution input switch A is 1 (ON), and has the resistors Rh—A and R It is configured to pass current through h-B.
- the output terminals of the AND gates X1 to X9 are connected to the gates of the transistors M1, M3, M5,.
- the AND gates X1 to X7 are of a two-input type, while the AND gates X8 and X9 are of a three-input type.
- AND gate X1 ⁇ X9 At least one of the input terminals is connected to the discharge execution input switch A.
- one input terminal of the 1 ⁇ long gate 10, XI 2, XI 4 and XI 6 is connected to the deflection direction switching switch C, and the other input terminal is used for the deflection control. Connected to switches J1 to J3 or discharge angle correction switch S.
- the deflection direction switching switch C is a switch for switching to which side the ink ejection direction is deflected in the direction in which the nozzles 18 are arranged.
- the deflection direction switch C becomes 1 (ON)
- one of the inputs of the XNOR gate X 10 becomes 1.
- the deflection control switches J1 to J3 are switches for determining the amount of deflection when deflecting the ink ejection direction.For example, when the deflection control switch J3 is set to 1 (ON), the XNOR One of the inputs to gate X 10 goes to 1.
- the output terminals of the XNOR gates X10 to X16 are connected to one input terminal of the AND gates ⁇ 2, ⁇ 4, ⁇ X8, and the NOT gates ⁇ 11, ⁇ 13 ⁇ X 17 are connected to one input terminal of AND gates X 3, X 5, ⁇ X 9.
- One of the input terminals of the AND gates X8 and X9 is connected to the discharge angle correction switch K.
- the deflection amplitude control terminal B is a terminal for determining the amplitude of one step of deflection, and determines the current value of the transistors M2, M7, M17, which are constant current sources of each CM circuit. This is a terminal to determine, and is connected to the gates of the transistors M2, M7, M17. To set the deflection amplitude to 0, if this terminal is set to 0 V, the current of the current source becomes 0, the deflection current does not flow, and the amplitude can be set to 0. As this voltage is gradually increased, The current value gradually increases, allowing more deflection current to flow and increasing deflection amplitude.
- the appropriate deflection amplitude can be controlled by the voltage applied to this terminal.
- the sources of the transistor Ml connected to the resistor Rh-B and the sources of the transistors M2, M7,... Serving as constant current sources of the respective CM circuits are grounded to the ground (GND).
- “1" (Ml2 to M21) indicates that it has a standard element
- “X2" (M7 to M11) is equivalent to two standard elements connected in parallel. It shows that it has a simple element.
- “X N” indicates that the device has an element equivalent to a parallel connection of N standard elements.
- transistors M2, M7, Ml2, and Ml7 are "X4", “X2”, “XI”, and “XI”, respectively.
- the respective drain currents have a ratio of 4: 2: 1: 1.
- Discharge execution input switch A is set to 1 (ON) only when discharging ink.
- the deflection control switch J3 is set to ⁇ N / ⁇ FF. However, if the deflection control switches J2 and J1 are further turned on / off, the resistance Rh-A And the amount of current flowing through the resistor Rh-B can be set.
- the current flowing to the transistors M4 and M6 can be controlled by the deflection control switch J3, but the current flowing to the transistors M9 and M11 can be controlled by the deflection control switch J2. Furthermore, the current flowing through the transistors M14 and M16 can be controlled by the deflection control switch J1.
- the amount of current can be changed by changing the voltage applied between the gate and the ground of the transistors M2, M7, M12, and M17, so that the ratio of the drain current flowing through each transistor is 4: 2 : Deflection amount per step can be changed while keeping 1
- the deflection direction switching switch C allows the deflection direction to be switched to a position symmetrical with respect to the direction in which the nozzles 18 are arranged.
- a plurality of heads 11 are arranged in the width direction of the printing paper, and the adjacent heads 11 are opposed to each other (by rotating 180 degrees with respect to the adjacent head 11). Arranged), so-called staggered arrangement may be.
- the deflection direction switching switch C is provided so that the deflection direction of the entire head 11 can be symmetrically switched.
- the ejection angle correction switches S and K are similar to the deflection control switches J1 to J3 in that they are switches for deflecting the ink ejection direction, but are used for correcting the ink ejection angle. Switch
- the discharge angle correction switch S is a switch for determining in which direction the nozzle 18 is to be corrected.
- the correction is performed using two bits including the ejection angle correction switches S and K. However, if the number of switches is increased, more detailed correction can be performed.
- Jl, J2 and J3 are given +1 or 11; S is given +1 or 11; K is given +1 or 0.
- the deflection current can be set to eight levels by setting each of Jl, J2, and J3, and independently of the settings of J1 to J3, S and K Corrections can be made.
- the deflection current can be set in four steps as a positive value and in four steps as a negative value, so that the ink deflection direction can be set in both directions in the arrangement direction of the nozzles 18.
- it can be deflected by ⁇ to the left with respect to the vertical direction (Z1 direction in the figure), and can be deflected by ⁇ to the right (Z2 direction in the figure).
- the value of ⁇ that is, the amount of deflection can be arbitrarily set.
- the printer of the present embodiment is provided with a distance detecting means for detecting the distance between the ink ejection surface of the head 11 and the surface of the photographic paper on which the ink lands.
- the distance detecting means may directly detect the distance between the ink ejection surface and the surface on which the ink lands on the printing paper, or may detect the above-described distance by detecting the thickness (paper thickness) of the printing paper. What you do.
- the distance detection means performs the above detection using a sensor.
- the sensor may be any sensor that reads information of light, pressure, displacement, and other physical quantities, such as an optical sensor and a pressure-sensitive sensor.
- a light emitting element and a light receiving element are provided, and light is emitted from the light emitting element to the printing paper so that the reflected light is received.
- the distance from the ink ejection surface to the landing surface of the ink on the photographic paper, which is the light irradiation surface is measured.
- the pressure-sensitive sensor When a pressure-sensitive sensor is used, the pressure-sensitive sensor is pressed against the surface of the photographic paper (the ink landing surface), the pressure value obtained at that time is measured, and the measured value is compared with a predetermined reference value. Value (pressure value of the reference paper thickness) and calculate the paper thickness from the comparison result. Then, the distance between the ink discharge surface and the ink landing surface of the photographic paper is calculated (detected) from the paper thickness.
- the printer is provided with a discharge deflection amount determining means for determining the discharge deflection amount of the liquid by the discharge direction deflecting means based on the detection result by the distance detecting means.
- the ejection deflection amount determining means controls the voltage applied to the deflection amplitude control terminal B based on the above detection result (for example, it can be digitally controlled using a DZA comparator).
- the respective drain currents are as follows: It becomes 1. Therefore, the current amount can be changed in eight steps by the deflection amplitude control terminal B. This makes it possible to adjust the deflection amount at the time of ink ejection in eight steps. If the number of transistors is further increased, the amount of current can be changed more finely.
- FIG. 6A to 6B are diagrams illustrating a method of determining the deflection amount by the ejection deflection amount determining means.
- the voltage of the deflection amplitude control terminal B may be controlled so that the discharge angle] 3 satisfies the above expression.
- the ink ejection direction can be deflected.
- the distance detecting means is not limited to the method using the above-described sensor, but may be, for example, the following method.
- receives information that can be used to specify the attributes of photographic paper such as information about the type of photographic paper (plain paper, coated paper, photo paper, etc.), which is transmitted with the print data during printing, and receives the received information.
- the distance between the liquid ejection surface of the head 11 and the surface of the photographic paper P on which the ink lands may be detected based on the distance.
- the reference paper thickness is stored for each type of photographic paper, the stored paper thickness is specified based on the received information, and the distance is detected from the paper thickness.
- the printer receives information input to a computer or directly to a printer that can specify the attributes of photographic paper, and based on the received information, an ink ejection surface and photographic paper P
- the distance between the ink and the surface on which the ink lands may be detected.
- the paper thickness is specified in the same manner as described above. Detecting the distance from the paper thickness may be mentioned.
- the optimum ejection angle is determined, and the ink ejection direction is determined. Can be deflected.
- this method cannot cope with a case where the paper thickness changes in each ink landing area on one photographic paper. For this reason, in the second embodiment, the paper thickness is always detected, and if the paper thickness changes, for example, in the middle, the optimum ejection angle is determined again in response to the change.
- FIG. 7 is a side view showing a schematic configuration of the printer according to the second embodiment.
- Fig. 8 shows the plan view of Fig. 7 and the printing paper P3. It is the figure which omitted the conveyance drive system.
- FIG. 9 is a front view of FIG. 8, and is a view as seen from the side of loading the photographic paper P3 into the line head 10.
- the photographic paper P 3 used in the second embodiment has a surface height, that is, a paper thickness that is not constant, and is part of an area on the ink landing surface.
- the projection Q is provided.
- the line head 10 is formed by arranging the above-described heads 11 in a line shape in the width direction of the printing paper P3.
- the relative moving means for relatively moving the line head 10 and the printing paper P 3 is such that the line head 10 is fixed, and the printing paper P 3 is relatively moved with respect to the line head 10.
- the transport drive system for the photographic paper P3 corresponding to the relative moving means is configured as follows, as shown in FIG.
- four paper feed rollers 23 are provided on the upstream side of the line head 10 (the side on which the photographic paper P 3 is carried into the line head 10).
- two paper feed rollers 23 located on the lower surface side of the photographic paper P3 are driven to rotate by obtaining driving force from driving means (not shown) such as a motor.
- Two paper feed rollers 23 are also provided on the upper surface side (ink landing surface side) of the photographic paper P3.
- a fixing member 22 is provided on the upper surface side of the photographic paper P 3
- two springs 24 are mounted on the lower surface side of the fixing member 22, and lower ends of these springs 24 are provided.
- a paper feed roller 23 is rotatably provided in the section.
- the feed roller 23 located on the upper surface side of the photographic paper P3 can be moved in the vertical direction in the figure by the spring 24. Therefore, even if the convex portion Q on the photographic paper P 3 passes through the paper feed roller 23, only the panel 24 is compressed, and the paper feed roller 2 3 located on the upper surface side of the photographic paper P 3 Is always pressed against the photographic paper P3 with a substantially constant pressure.
- the photographic paper P 3 is sandwiched from both sides by the four paper feed rollers 23 described above, and is sent to the line head 10.
- a support roller 25 is provided substantially directly below the line head 10 and in the vicinity of the ink landing position. This is to support the photographic paper P3 from the lower surface side of the photographic paper P3 so that the distance (gap) between the ink discharge surface of the line head 10 and the photographic paper P3 does not fluctuate during printing. Is what you do.
- Downstream of the line head 10 is provided a pair of paper discharge rollers 26 arranged to pinch and transport the photographic paper P3.
- the paper discharge rollers 26 located on the lower surface side of the photographic paper P 3 are arranged in the same manner as the above-described paper feed roller 23 located on the lower surface side of the photographic paper P 3, and are driven by a driving means such as a motor (see FIG. (Not shown).
- the paper discharge port 26 located on the upper surface side of the photographic paper P3 has a panel attached to a predetermined member similarly to the above-described paper feed roller 23 located on the upper surface side of the photographic paper P3. It is rotatably attached to the tip of 24.
- a sensor 21 corresponding to a distance detecting means in the present invention is provided between the line head 10 and the paper feed roller 23 in the transport direction of the photographic paper P3.
- a plurality of sensors 21 are provided, and the sensors 21 are juxtaposed in the longitudinal direction of the line head 10 (the direction in which the liquid ejection sections are arranged). I have. Also, the sensing surface of sensor 21 and the line As shown in FIG. 7, the ink ejection surfaces of the heads 10 are mounted so as to coincide with each other.
- the sensor 21 emits one laser beam (pulse light) to the ink landing surface of the photographic paper P3, receives the reflected light, and generates a seventh light based on the wavelength of the received reflected light.
- the distance H between the ink ejection surface of the line head 10 and the landing surface of the printing paper P3 is detected.
- each sensor 21 of the present embodiment has a predetermined detection area in the direction in which the liquid ejection sections are arranged.
- a plurality of sensors 21 are provided in the line head 10, but can measure the distance H directly below all the liquid ejection sections of the line head 10.
- the senor 21 of the present embodiment is capable of scanning a region having a maximum width of 40 mm in the arrangement direction of the liquid discharge units at a high speed.
- one cycle can be collected at 30 ms, and 100 points can be collected at a width of 40 mm. Therefore, as shown in FIGS. 8 and 9, when six sensors 21 are provided, it is possible to collect 600,000 points in a width of 240 mm.
- FIG. 10 is a side view showing the positional relationship between the line head 10 and the sensor 21 in more detail.
- the line head 10 of the present embodiment has a line head formed by arranging the above-described heads 11 in the direction in which the liquid ejection units are arranged, in each color (in the example of FIG. 10, Y, M, C, and K) in parallel.
- the distance between the detection point by the sensor 21 and the ink landing position of the line head for each color (L1 in FIG. 10). 1 to L 14) are different from each other, these distances L 11 to L 14 are stored in advance, and the ink discharge from the liquid discharge part of the line head of each color is determined based on the transport speed of the printing paper P 3.
- the distance H at the time can be determined.
- FIG. 11 is a block diagram showing a sensor 21 (distance detecting means), a data table 31 and an ejection deflection amount calculation circuit 32 as an ejection deflection amount determining means of the present embodiment.
- the detection result is sent to the ejection deflection amount calculation circuit 32. Then, based on the detection result of the sensor 21, the discharge deflection amount calculation circuit 32 refers to the data table 31 to determine the discharge deflection amount for each liquid discharge unit.
- the data table 31 defines the ejection deflection amount of the ink ejected from the liquid ejection unit corresponding to the detected distance H and the landing target position of the ink ejected from the liquid ejection unit. It is.
- FIG. 12 is a diagram for explaining the data table 31.
- the distance between the ink discharge surface of the line head 10 and the ink landing surface (upper surface of the photographic paper P3) is H, and the line head 10 is
- the ink is ejected from the liquid ejecting portion of the ink directly below (perpendicular to the ink landing surface) (indicated by the dashed arrow in FIG. 12)
- the ink landing position and the ink are deflected.
- the distance from the ink landing position when ejected is defined as the deflection amount.
- the angle (ejection angle) between the ejection direction and the ejection surface of the ink when the ink is deflected and ejected is defined as a.
- the above angle was defined as the discharge angle a.
- the angle from the direction perpendicular to the landing surface of the ink (0 in FIG. 3) is also defined as the discharge angle.
- the ejection angle a can be obtained as a function of the distance H and the deflection amount ⁇ L.
- the data table 31 stores the relationship between the distance H, the deflection amount, and the discharge angle ⁇ in advance.
- the ejection deflection amount calculation circuit 32 refers to the data table 31 and calculates a corresponding ejection angle. Then, the data of the ejection angle is transmitted to the control circuit 33 as, for example, serial data.
- the control circuit 33 controls the ejection of the ink for each line head 10, that is, for each liquid ejection unit, based on the transmitted ejection angle data and the drive signal for ejecting the ink.
- control circuit 33 uses the deflection amplitude control terminal of the circuit shown in FIG. 5 to obtain the discharge angle based on the discharge angle data transmitted from the discharge deflection amount calculation circuit 32. Determine the voltage to be applied to B.
- the above control is always performed when the ink is continuously ejected. That is, while the photographic paper P3 continues to be conveyed, the sensor 21 constantly detects the distance H, and sequentially sends the detection result to the ejection deflection amount calculation circuit 32. Then, for each pixel line, it is always calculated which liquid ejection section should eject ink at which ejection angle, and sends it to the control circuit 33 in real time. At this time, as shown in FIG. 10, the distance (L11 to L14) between the ink ejection position of the line head of each color and the detection point of the sensor 21 is considered. And the detection result of sensor 21 and its The setting is made so that the pixel angle corresponds to the ejection angle a calculated as above.
- FIG. 13 is a front view showing a state in which ink is ejected from three liquid ejection units “N ⁇ 1”, “N”, and “N + 1” in the line head 10.
- the landing position of the ink from the liquid discharge portion “N-1” is a portion other than the convex portion Q
- the landing position of the ink from the liquid discharge portion “N” is This is an example in which the ink droplet landing position from the liquid discharge unit “N + 1” is the convex portion Q, which is the boundary.
- ink is ejected from each liquid ejecting section in a direction perpendicular to the surface of the photographic paper P3.
- the ink shall land on the shifted position.
- the deflection amount calculation circuit 32 calculates the discharge angle H when the deflection amount is shifted from the vertical position by the deflection amount.
- control circuit 33 determines the voltage to be applied to the deflection amplitude control terminal ⁇ that satisfies the discharge angle ⁇ , and controls the discharge of the ink from the liquid discharge unit “ ⁇ -1”.
- the ejection angle ⁇ when the liquid ejection section is shifted from the vertical position by the deflection amount A L to the left in the figure is calculated in the same manner as described above.
- ⁇ tan— 1 ( ⁇ L / H 2) It is calculated by: Then, the control circuit 33 determines the voltage to be applied to the deflection amplitude control terminal B that satisfies the ejection angle, and controls the ejection of the ink from the liquid ejection unit “N”.
- the ejection angle may be set to either ⁇ or Control may be unified on one side. In this way, control can be simplified.
- the ink is deflected rightward in the figure from the liquid ejection part “ ⁇ ”, even if the ejection angle is set to “H”, the deviation is inconspicuous with about 1 dot, It is also possible to simplify as described above.
- FIG. 14 is a side view showing an example in which the distance ⁇ ⁇ changes even when the printing paper does not have a convex portion, and is a diagram corresponding to FIG.
- the photographic paper # 4 is sent to the line head 10 with the leading end curled.
- the space between the bottom of the line head 10 and the upper surface of the photographic paper ⁇ 4 is a space through which the ejected ink passes, so the photographic paper ⁇ 4 is placed on the upper surface side. It is not possible to arrange a roller or holding member for holding down from above. For this reason, generally, just below the run head 10, only the support roller 25 (or other support member or the like) for supporting the photographic paper # 4 from the lower surface side is provided.
- a paper feed roller 23 is provided on the side of the line head 10 where the photographic paper # 4 is carried in, and the paper feed roller 23 carries the photographic paper # 4 into the line head 10.
- the ink receiving surface of photographic paper No. 4 By contacting the side, it functions as a holding member for keeping the distance H constant.
- the senor 21 emits a laser beam between the line head 10 and a holding member such as the paper feed port 23 in the transport direction of the photographic paper P4 (in the horizontal direction in the figure). It is provided so that one light and its reflected light pass. Therefore, when the leading end is curled as in the photographic paper P4, the distance H changes depending on the curling state.
- the distance H is detected by the sensor 21 disposed immediately before the photographic paper P 4 enters the line head 10, even if the photographic paper P 4 is curled. Even if it is, the distance H that fluctuates according to the state of the curl can be detected as accurately as possible.
- FIG. 15 is a diagram illustrating a third embodiment of the present invention.
- the third embodiment is a modification of the second embodiment, in which an ink is landed on a photographic paper P3 having a convex portion Q, but the sensor is different from that of the second embodiment.
- the senor 21 A of the third embodiment emits a pinpoint laser light.
- one sensor 21A is provided for each head 11. Thereby, for one head 11, the distance H at only one location is detected. Therefore, there is a non-detection range of distance H between the sensors 21A.
- the “N” th sensor 21 A (N) corresponding to the “N” th head 11 is, as shown in FIG. It is assumed that the distance H from the discharge surface to the ink landing surface of the photographic paper P3 is detected as H1.
- the distance at the position where the laser beam is actually emitted can be known, but the distance H located between them is unknown.
- the third embodiment includes a distance setting unit.
- the distance setting means has a non-detection range of the distance H, such as between the ⁇ N ''-th and ⁇ N + 1 ''-th sensors 21A, and a liquid ejection section corresponding to the non-detection range. If the distances H detected by the sensors 21 A (N) and 21 A (N + 1) (“N” th and “N + 1” th) on both sides of the non-detection range The distance H for the liquid ejection part corresponding to the detection range is determined by the distance detected by the “N” th sensor 21 A (N). This is set to a value (H2 ⁇ H ⁇ H1) between the separation H1 and the distance H2 detected by the "N + 1" th sensor 21A (N + 1).
- the detection position of the "N" th sensor 21A (N) and the detection position of the "N + 1" th sensor 21A (N + 1) A distance H corresponding to each liquid discharge unit is calculated such that the position is connected with a straight line and the distance H gradually changes for each liquid discharge unit.
- the change in the distance H is divided into multiple steps, the distance H between several liquid ejection sections is set to be constant, and the distance H is changed gradually for each of the several liquid ejection sections.
- a method for calculating the distance H is given below.
- the distance setting means may have its function in the ejection deflection amount calculation circuit 32 in the second embodiment, for example.
- the distance H corresponding to all the liquid ejection sections can be detected by the six sensors 21.For example, when the number of the sensors 21 is less than 6, A non-detection range is created between the sensors 21.
- the distance setting means may be provided to set the distance H corresponding to each liquid discharge unit so that the distance H does not suddenly change in the direction in which the liquid discharge units are arranged.
- the distance H can be accurately detected.
- the sensor 21 or 21 A is not accurately attached to the line head 10, a detection error of the distance H by the sensor 21 or 21 A occurs. Therefore, the ink of each liquid ejection part of the line head 10 is It is desirable that the discharge surface and the detection surface of the sensor 21 or 21 A be adjusted in advance.
- the ink ejection surface of each liquid ejection unit of the line head 10 has no positional deviation in the direction in which the liquid ejection units are arranged (the ink ejection surface is horizontal with respect to the ink landing surface).
- the sensor 21 or 21A detects the reference between the ink ejection surface and the ink deposition reference surface in the direction in which the liquid ejection portions of the line head 10 are arranged. Detect distance 'at multiple locations. In this case, in a state where no photographic paper is present, the above-described reference distance is detected, for example, using the upper end surface of the support opening roller 25 as an ink landing reference surface.
- correction value calculation means a correction value corresponding to each liquid ejection unit is calculated based on the detected reference distance.
- the calculation result is stored in advance (correction value storage means).
- the ejection deflection amount calculation circuit 32 calculates the data table 31 from the distance detected by the sensor 21 or 21 A, the target landing position of the liquid, and the correction value stored in the correction value storage means. With reference to, the discharge deflection amount of the liquid by the discharge direction deflecting means corresponding to each liquid discharge unit may be determined.
- the ink ejection angle is determined based on the distance H for each liquid ejection unit. This is because it is determined individually. Therefore, the same result as in the case where the convex portion Q exists on the ink landing surface of the photographic paper P3 is obtained.
- FIG. 16 is a block diagram illustrating a fourth embodiment of the present invention, and corresponds to FIG. 11 of the second embodiment.
- no distance detecting means such as the sensor 21 is provided. Instead, a distance information obtaining means 34 is provided.
- the distance information acquiring means 34 is adapted to correspond to the transport movement of the photographic paper and to provide distance information between the ink discharge surface and the ink landing surface of the line head 10 (information on the distance H, (Information that can specify the distance H).
- the distance information is transmitted from, for example, an external host computer or a paper thickness designation unit provided inside the printer.
- the distance information obtaining means 34 obtains the distance information, it sends the information to the ejection deflection amount calculation circuit 32 as in the second embodiment.
- the processing in the ejection deviation amount calculation circuit 32 is the same as in the second embodiment.
- the distance H is set based on an instruction from outside or inside the printer, instead of detecting the actual distance H using the sensor 21 or the like.
- the present embodiment can be applied to a case where a resist is drawn on a printed wiring board.
- the distance H at each position on the printed wiring board can be determined by the distance H at each position on the printed wiring board without actually measuring the distance H if the pattern on the printed wiring board is known. You may be able to know.
- the distance information acquisition means 34 acquires the distance information to obtain the ejection deflection amount calculation circuit 3 2 In this case, it is possible to obtain the same effect as detecting the distance sequentially by the sensor 21 in accordance with the conveyance of the printing paper.
- this invention is not limited to the said Embodiment, For example, the following various deformation
- the heating resistor 13 divided into two is provided, but the heating resistor 13 divided into three or more may be provided.
- the planar shape is substantially in a zigzag shape (such as a U-shape), and a conductor (electrode) is connected to the zigzag folded portion.
- the main part that generates thermal energy for discharging the ink is divided into at least two parts through the substantially zigzag folded part, and at least one main part and at least one other main part It is also possible to provide a difference in the generation of thermal energy, and to control the ink ejection direction to be deflected by the difference.
- the distance H is detected by one laser beam.
- various types of material waves electromagnétique waves, light waves, ultrasonic waves, etc.
- Distance H can be detected.
- pulse light such as laser light
- the distance H may be detected based on the wavelength difference between the emitted light and the reflected light.
- the distance H may be detected by measuring the time from when an ultrasonic wave is emitted to when the reflected wave is received.
- the ink ejection surface of each liquid ejection portion of the line head 10 and the laser light emission surface of the sensor 21 are made to be the same surface. Placed. However, an offset may be provided between the ink ejection surface of the line head 10 and the laser light emission surface of the sensor 21. In this case, the offset amount may be stored in advance, and the distance H may be calculated from the detection result of the sensor 21 and the offset amount. The same applies to the third embodiment.
- the detection area of the distance H is secured in substantially the entire range in the direction in which the liquid ejection sections of the line head 10 are arranged.
- the present invention is not limited to this, and in the case where printing is mostly performed on photographic paper with little unevenness, the number of sensors 21 may be reduced so that the detection area of the distance H is not necessarily secured in almost the entire range. good. Industrial applicability
- the liquid discharge direction when the liquid discharge direction is deflected, an appropriate amount of deflection is set even when the distance from the liquid discharge surface to the liquid landing surface of the liquid discharge target changes. can do. Therefore, the liquid can be landed at an appropriate position even on a liquid ejection target having various thicknesses.
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- Particle Formation And Scattering Control In Inkjet Printers (AREA)
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Abstract
Description
Claims
Priority Applications (7)
Application Number | Priority Date | Filing Date | Title |
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EP03756677.5A EP1555125B1 (en) | 2002-10-18 | 2003-10-17 | Liquid discharge apparatus and method |
US10/531,511 US20060197811A1 (en) | 2002-10-18 | 2003-10-17 | Liquid ejector and method for ejecting liquid |
US11/957,987 US7883167B2 (en) | 2002-10-18 | 2007-12-17 | Liquid ejector and method for ejecting liquid |
US11/958,002 US7891751B2 (en) | 2002-10-18 | 2007-12-17 | Liquid ejector and method for ejecting liquid |
US11/957,911 US8087741B2 (en) | 2002-10-18 | 2007-12-17 | Liquid ejector and method for ejecting liquid |
US11/957,928 US7883166B2 (en) | 2002-10-18 | 2007-12-17 | Liquid ejector and method for ejecting liquid |
US11/958,020 US8087742B2 (en) | 2002-10-18 | 2007-12-17 | Liquid ejector and method for ejecting liquid |
Applications Claiming Priority (4)
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JP2002-303913 | 2002-10-18 | ||
JP2002303913 | 2002-10-18 | ||
JP2003-153320 | 2003-05-29 | ||
JP2003153320A JP3695537B2 (ja) | 2002-10-18 | 2003-05-29 | 液体吐出装置及び液体吐出方法 |
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US10/531,511 A-371-Of-International US20060197811A1 (en) | 2002-10-18 | 2003-10-17 | Liquid ejector and method for ejecting liquid |
US11/957,928 Division US7883166B2 (en) | 2002-10-18 | 2007-12-17 | Liquid ejector and method for ejecting liquid |
US11/958,020 Division US8087742B2 (en) | 2002-10-18 | 2007-12-17 | Liquid ejector and method for ejecting liquid |
US11/957,987 Division US7883167B2 (en) | 2002-10-18 | 2007-12-17 | Liquid ejector and method for ejecting liquid |
US11/958,002 Division US7891751B2 (en) | 2002-10-18 | 2007-12-17 | Liquid ejector and method for ejecting liquid |
US11/957,911 Division US8087741B2 (en) | 2002-10-18 | 2007-12-17 | Liquid ejector and method for ejecting liquid |
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WO2004035316A1 true WO2004035316A1 (ja) | 2004-04-29 |
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JP3695537B2 (ja) * | 2002-10-18 | 2005-09-14 | ソニー株式会社 | 液体吐出装置及び液体吐出方法 |
US7222927B2 (en) | 2002-12-12 | 2007-05-29 | Sony Corporation | Liquid discharge device and liquid discharge method |
JP4632648B2 (ja) | 2003-10-02 | 2011-02-16 | ソニー株式会社 | 液体吐出装置及び液体吐出方法 |
JP2006264074A (ja) * | 2005-03-23 | 2006-10-05 | Fuji Xerox Co Ltd | 液滴吐出装置 |
JP4835018B2 (ja) * | 2005-03-25 | 2011-12-14 | ソニー株式会社 | 液体吐出ヘッド及び液体吐出装置 |
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- 2003-10-17 US US10/531,511 patent/US20060197811A1/en not_active Abandoned
- 2003-10-17 WO PCT/JP2003/013316 patent/WO2004035316A1/ja active Application Filing
- 2003-10-17 KR KR1020057006516A patent/KR101015723B1/ko not_active IP Right Cessation
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Also Published As
Publication number | Publication date |
---|---|
US7883166B2 (en) | 2011-02-08 |
JP3695537B2 (ja) | 2005-09-14 |
US8087742B2 (en) | 2012-01-03 |
US20080266344A1 (en) | 2008-10-30 |
KR101015723B1 (ko) | 2011-02-22 |
US7891751B2 (en) | 2011-02-22 |
EP1555125B1 (en) | 2013-12-04 |
EP1555125A4 (en) | 2009-09-09 |
US20060197811A1 (en) | 2006-09-07 |
US20080106563A1 (en) | 2008-05-08 |
US7883167B2 (en) | 2011-02-08 |
US20080100656A1 (en) | 2008-05-01 |
EP1555125A1 (en) | 2005-07-20 |
JP2004188956A (ja) | 2004-07-08 |
KR20050071583A (ko) | 2005-07-07 |
US20080106561A1 (en) | 2008-05-08 |
US20080106562A1 (en) | 2008-05-08 |
US8087741B2 (en) | 2012-01-03 |
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