USRE37453EExpiredUtility
Ink jet print head
Est. expiryOct 28, 2014(expired)· nominal 20-yr term from priority
B41J 2202/11B41J 2/01B41J 2002/14387B41J 2/1404B41J 2/1433B41J 2202/03B41J 2002/14475
33
PatentIndex Score
0
Cited by
4
References
20
Claims
Abstract
An ink jet print head comprises a substrate formed with a heating resistor, an ink path defining member for defining an ink supply path, and an orifice plate, and in the orifice plate, there is formed an ink outlet at the position opposing the heating resistor. Further, a heating zone surrounding the heating resistor is formed at the position corresponding to the heating resistor of the ink supply path. The channel resistance of the ink supply path is set so that a relationship is established between a quantity q of the discharged ink drop, a sectional area A of the ink outlet, and a maximal projection h 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 such that 0<h<0.3q/A 0<h<0.25q/A. Consequently, there is obtained a high-speed printing of high quality without dispersion.
Claims
exact text as granted — not AI-modifiedWhat is claimed is:
1. An ink jet print head comprising:
a substrate member formed with a heating resistor;
an ink path defining member provided on the substrate member, for defining an ink supply path including a heating zone in a vicinity of the heating resistor; and
an orifice plate member formed with an ink outlet communicating with the ink supply path and laminated on the substrate member, with the ink path defining member interposed therebetween coupled to the ink path defining member,
said ink jet print head generating heat from the heating resistor to discharge a drop of ink from the ink outlet,
said ink supply path having a fluid resistance so that a relationship is established such that:
0<h<0.3(q/A) 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 maximumal 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)} ⅔ ≦A<π{(3q/2π)} ⅔ .
3. An ink jet print head according to claim 1 , wherein another relationship is established such that:
0.9×t 1 <t min <1.1×t 1 ,
where t 1 is a time for the meniscus of the ink to restore the exit level from the retreat position, and t min is a minimal period by which said ink jet print head discharges the drop of the ink.
4. An ink jet print head comprising:
a substrate member formed with a heating resistor:
for defining an ink supply path including a heating zone in a vicinity of the heating resistor; and
an orifice plate member formed with an ink outlet communicating with the ink supply path and coupled to the ink path defining member,
said ink jet print head generating heat from the heating resistor to discharge a drop of the ink outlet,
said ink supply path having a fluid resistance so that a relationship is established such that:
0 <h< 0 . 24 ( 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.
5. The ink jet print head according to claim 4 , wherein another relationship is established such that:
π{( 3 q/ 4 π )} ⅔ ≦A≦ π{( 3 q/ 2 π)} {fraction ( 2 / 3 )} .
6. The ink jet print head according to claim 4 , wherein another relationship is established such that:
0 . 9 ×t 1 <t min < 1 . 1 ×t 1
where t
1
is a time for the meniscus of the ink to restore the exit level from the retreat position, and t
min
is a minimal period by which said ink jet print head discharges the drop of the ink.
7. An ink-jet print head comprising:
a substrate member formed with a heating resistor;
an ink path defining member provided on the substrate member for defining an ink supply path including a heating zone in a vicinity of the heating resistor; and
an orifice plate member formed with an ink outlet communicating with the ink supply path and coupled to the ink path defining member,
said ink jet print head generating heat from the heating resistor to discharge a drop of the ink outlet,
said ink jet print head generating heat from the heating resistor to discharge a drop of the ink outlet,
said ink supply path having a fluid resistance so that a relationship is established such that:
0 <h< 0 . 21 ( 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 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 print head according to claim 7 , wherein another relationship is established such that:
π{( 3 q/ 4 π)} ⅔ ≦A ≦π{( 3 q/ 2 π)} ⅔ .
9. The ink jet print head according to claim 7 , wherein another relationship is established such that:
0 . 9 ×t
1
<t
min
< 1 . 1 ×t
1
where t
1
is a time for the meniscus of the ink to restore the exit level from the retreat position, and t
min
is a minimal period by which said ink jet print head discharges the drop of the ink.
10. An ink jet print head comprising:
a substrate member formed with a heating resistor;
an ink path defining member provided on the substrate member, for defining an ink supply path including a heating zone in a vicinity of the heating resistor, and
an orifice plate member formed with an ink outlet communicating with the ink supply path and coupled to the ink path defining member,
said ink jet print head generating heat from the heating resistor to discharge a drop of the ink outlet,
said ink supply path having a fluid resistance so that a relationship is established such that:
0 <h≦ 0 . 2 ( 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.
11. The ink jet print head according to claim 10 , wherein another relationship is established such that:
π{( 3 q/ 4 π)} ⅔ ≦A ≦π{( 3 q/ 2 π)} ⅔ .
12. The ink jet print head according to claim 10 , wherein another relationship is established such that:
0 . 9 ×t
1
<t
min
< 1 . 1 ×t
1
where t
1
is a time for the meniscus of the ink to restore the exit level from the retreat position, and t
min
is a minimal period by which said ink jet print head discharges the drop of the ink.
13. 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 on an substrate formed with a resistor in said ink jet printing head, said method comprising the steps of,
heating said resistor for generating a bubble in said ink supply path to discharge the drop of the ink, 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.
14. The ink jet printing method according to claim 13 , wherein said relationship is established such that:
0 <h< 0 . 24 ( 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.
15. The ink jet printing method according to claim 13 , wherein said relationship is established such that:
0 <h< 0 . 21 ( q/A ),
where q is a quantity of the rop 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 had 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.
16. The ink jet printing method according to claim 13 , wherein said relationship is established such that:
0 <h≦ 0 . 2 ( 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.
17. An ink jet printing device for printing an image on a recording material by discharging a drop of an ink from an ink jet print head,
wherein said ink-jet print head comprises;
a substrate member formed with a heating resistor;
an ink path defining member provided on the substrate member, for defining an ink supply path including a heating zone in a vicinity of the heating resistor; and
an orifice plate member formed with an ink outlet communicating with the ink supply path and coupled to the ink path defining member,
said ink jet print head generating heat from the heating resistor to discharge a drop of the ink outlet,
said ink jet print head generating heat from the heating resistor to discharge a drop of the ink outlet,
said ink supply path having 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.
18. The ink jet printing device according to claim 17 ,
wherein said relationship is established such that;
0 <h< 0 . 24 ( 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.
19. The ink jet printing device according to claim 17 , wherein said relationship is established such that;
0 <h< 0 . 21 ( 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 at meniscus of the ink has when it projections from the ink outlet after it has restored the exit level form a retreat position it had after the drop of the ink had been discharged.
20. The ink jet printing device according to claim 17 , wherein said relationship is such that:
0 <h≦ 0 . 2 ( 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.Cited by (0)
No later patents cite this yet.
References (0)
No backward citations on record.