Claims
- 1. An ink jet print head comprising:an ink supply path; an ink outlet communicating with the ink supply path; and discharge means disposed in said ink supply path for discharging a drop of ink from the ink outlet, wherein said ink supply path has a fluid resistance so that a relationship is established such that: 0<h<0.25 (q/A), where q is a quantity of the drop of the ink, A is a sectional area at an exit level of the ink outlet, and h is a maximum projection that a meniscus of the ink has when it projects from the ink outlet after it has restored the exit level from a retreat position it had after the drop of the ink had been discharged.
- 2. An ink jet print head according to claim 1, wherein another relationship is established such that:π{(3q)/(4π)}2/3≦A≦π{(3q)/(2π)}2/3.
- 3. An ink jet print head according to claim 1, wherein another relationship is established such that:0.9×t1<tmin<1.1×t1, where t1 is a time for the meniscus of the ink to restore the exit level from the retreat position, and tmin is a minimal period by which said ink jet print head discharges the drop of the ink.
- 4. The ink jet print head as recited in claim 1, wherein said fluid resistance of said ink supply path is established such that 0<h<0.24 (q/A).
- 5. The ink jet print head as recited in claim 1, wherein said fluid resistance of said ink supply path is established such that 0<h<0.21 (q/A).
- 6. The ink jet print head as recited in claim 1, wherein said fluid resistance of said ink supply path is established such that 0<h<0.2 (q/A).
- 7. An ink jet printing method for generating a drop of an ink from an ink outlet of an ink jet print head, said ink outlet being connected to an ink supply path formed with discharge means in said ink jet printing head, said method comprising the steps of:discharging the drop of the ink by said discharge means; and providing a fluid resistance in said ink supply path so that a relationship is established such that: 0<h<0.25 (q/A), where q is a quantity of the drop of the ink, A is a sectional area at an exit level of the ink outlet, and h is a maximum projection that a meniscus of the ink has when it projects from the ink outlet after it has restored the exit level from a retreat position it had after the drop of the ink had been discharged.
- 8. The ink jet printing method according to claim 7, wherein said fluid resistance of said ink supply path is established such that 0<h<0.24 (q/A).
- 9. The ink jet printing method according to claim 7, said fluid resistance of said ink supply path is established such that 0<h<0.21 (q/A).
- 10. The ink jet printing method according to claim 7, said fluid resistance of said ink supply path is established such that 0<h<0.2 (q/A).
Priority Claims (1)
Number |
Date |
Country |
Kind |
6-265294 |
Oct 1994 |
JP |
|
Parent Case Info
This is a division of application Ser. No. 08/549,053, filed Oct. 27, 1995, now U.S. Pat. No. 5,880,761.
US Referenced Citations (7)
Foreign Referenced Citations (6)
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Non-Patent Literature Citations (1)
Entry |
allen et al; Thermodynamics and Hydrodynamics of Thermal Ink Jets; Hewlett-Packard Journal, pp. 21-27, May 1985. |