Claims
- 1. An ink jet recording apparatus including an ink jet recording head provided with a discharge port for discharging ink, an ink flow path communicating with said discharge port, and at least two heat generating elements provided in said ink flow path along the direction thereof,wherein the ink is pigment-based ink and said recording head comprises drive signal supply means for varying supply timings of drive signals to said plural heat generating elements for ink discharge in such a manner that one of the drive signals is at first given to one of said heat generating elements at a discharge port side of said ink flow path at room temperature and the supply timings to said plural heat generating members become simultaneous or closer thereto with an increase in a temperature of said recording head, wherein each of the drive signals includes a preliminary drive signal and a main drive signal, and wherein said drive signal supply means is adapted, after the supply timings to said plural heat generating elements become simultaneous with the increase in the temperature, to reduce a pulse duration of the preliminary drive signals in response to a further increase in the temperature.
- 2. An ink jet recording apparatusincluding an ink jet recording head provided with plural discharge ports for discharging ink, plural ink flow paths respectively communicating with said plural discharge ports, and at least two heat generating elements provided in each of said ink flow paths along the direction thereof, wherein said ink jet recording head comprises a pigment-based ink discharge portion for discharging pigment-based ink and a dye-based ink discharge portion for discharging dye-based ink, and said ink jet recording apparatus comprises drive signal supply means for varying supply timings of drive signals for ink discharge to said heat generating elements of said pigment-based ink discharge portion in such a manner that the drive signals are at first given to ones of said heat generating elements at discharge port sides of said respective ink flow paths at room temperature and the supply timings to said plural heat generating members become simultaneous or closer thereto with an increase in a temperature of said recording head, wherein each of the drive signals includes a preliminary drive signal and a main drive signal, and wherein said drive signal supply means is adapted, after the supply timings to said plural heat generating elements become simultaneous with the increase in the temperature, to reduce a pulse duration of the preliminary drive signals in response to a further increase in the temperature.
- 3. An ink jet recording apparatus according to claim 2, wherein the drive signals for ink discharge given to said heat generating elements of said dye-based ink discharge portion are supplied in succession in such a manner that the drive signals are given later to ones of said heat generating elements at discharge port sides of said respective ink flow paths.
- 4. An ink jet recording apparatus according to claim 3, wherein, in said dye-based ink discharge portion, the supply timings of the drive signals for ink discharge to said plural heat generating elements are not made variable.
- 5. An ink jet recording apparatus capable of selectively mounting a first head provided with plural discharge ports for discharging ink, plural ink flow paths respectively communicating with said plural discharge ports, and at least two heat generating elements provided in each of said ink flow paths along the direction thereof and adapted to discharge pigment-based ink of a desired color, or a second head having a structure same as that of the first head and adapted to discharge dye-based ink of a color same as that of said pigment-based ink, wherein said ink jet recording apparatus comprises ID recognition means for recognizing an ID provided on each head, and a ROM including a supply timing table, for each ID, for the drive signals for the ink discharge by said plural heat generating elements, and the supply timing table of the ROM is selected according to the ID recognized by said recognition means to vary the supply timings of the drive signals for ink discharge by said plural heat generating elements in each head according to the kind of the ink thereby discharging ink droplets of a substantially constant amount in each head.
- 6. An ink jet recording apparatus according to claim 5, wherein the supply timings of the drive signals for said plural heat generating elements for discharging pigment-based ink are such that the drive signal is at first given to the heat generating element at the side of the discharge port, and the supply timings of the drive signals for said plural heat generating elements for discharging dye-based ink are such that the drive signal is given later to the heat generating element at the side of the discharge port.
- 7. An ink jet recording apparatus according to claim 5, wherein each of said first and second heads is capable of discharging, in addition to the ink of said desired color, ink of a different color, which is of a same kind.
- 8. An ink jet recording apparatus according to claim 5, further comprising drive signal supply means for varying the supply timing of drive signals to said plural heat generating elements of the first head for ink discharge in such a manner that the drive signal is at first given to the heat generating element at the side of the discharge port at a room temperature and the supply timings at the plural heat generating members become simultaneous or closer thereto with an increase in the temperature of the recording head.
- 9. An ink jet recording apparatus according to claim 8, wherein said drive signal includes a preliminary drive signal and a main drive signal.
- 10. An ink jet recording apparatus according to claim 9, wherein said drive signal supply means is adapted, after the supply timings at said plural heat generating elements become simultaneous with the increase in temperature, to reduce the pulse duration of said preliminary drive signal in response to a further increase in temperature.
- 11. An ink jet recording head provided with plural discharge ports for discharging ink, plural ink flow paths respectively communicating with said discharge ports, and at least two heat generating elements provided in each of said ink flow paths along the direction thereof, comprising:a ROM having a supply timing table for the drive signals for the ink discharge by said plural heat generating elements for compensating the change in physical properties of said ink depending on the head temperature; wherein the supply timings of the drive signals for ink discharge by said plural heat generating elements are varied according to the head temperature based on said supply timing table thereby discharging ink droplets of a substantially constant amount.
- 12. An ink jet recording head provided with plural discharge ports for discharging ink, a discharge port forming member provided with said plural discharge ports, plural ink flow paths respectively communicating with said plural discharge ports, and a heat generating element provided in each of said ink flow paths, the plural ink flow paths including an ink flow path in which ink of a different color is supplied;wherein said discharge port forming member has different thicknesses for the discharge ports for the inks of different colors and has a boundary portion between the discharge ports for discharging the inks of the different colors, and the thickness of the discharge port forming member is changed at said boundary portion.
- 13. An ink jet recording head according to claim 12, wherein said heat generating element is provided in at least two units in the ink flow path along the direction thereof.
- 14. An ink jet recording head according to claim 12, wherein the discharge amount is different for each color of the ink discharged by said ink jet recording head.
- 15. An ink jet recording head provided with plural discharge ports for discharging ink, a discharge port forming member provided with said plural discharge ports, plural ink flow paths respectively communicating with said plural discharge ports, and at least two heat generating elements provided in each of said ink flow paths along the direction thereof, said plural ink flow paths including an ink flow path in which ink of a different color is supplied and the discharge amount being different for each color of the ink discharged by said ink jet recording head;wherein said ink flow paths have a same length and a same height but are different in at least one of the heat generating element, the width of the ink flow path and the thickness of the discharge port forming member for each color of the ink to be discharged, thereby attaining a desired discharge amount for each color of the ink to be discharged.
Priority Claims (1)
Number |
Date |
Country |
Kind |
11-235758 |
Aug 1999 |
JP |
|
Parent Case Info
This application is a divisional of application Ser. No. 09/640,586, filed on Aug. 18, 2000.
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