EP0488806A2
Expired / Lapsed
EP
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Ink jet recording head and driving circuit therefor
Assignee: Canon Inc
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Filing: 1991-11-29
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Granted: —
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Expires: 2011-11-29
Abstract
Abstract An ink jet recording head (55) includes a plurality of heat generating elements (62) for ejecting ink using thermal energy; a conductive line commonly connected to an end of each of the heat generating elements and to another end of adjacent heat generating element; a driving circuit for selectively providing positive or negative current to the common lines, the driving circuit actuates the heat generating elements by applying a high level potential and a low level potential to adjacent lines, respectively.
Inventors
- 👤 Yasuyuki C/O Canon Kabushiki Kaisha Tamura
- 👤 Masafumi C/O Canon Kabushiki Kaisha Wataya
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-09 16:19
CPC Classifications
B; B41; B41J; B41J2/00; B41J2/005; B41J2/01; B41J2/015; B41J2/04; B41J2/045; B41J2/04501; B41J2/04541; B41J2/04543; B41J2/0458; B41J2202/00; B41J2202/01; B41J2202/21
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
79 words
An ink jet recording head, comprising: a plurality of heat generating elements for ejecting ink using thermal energy; a conductive line commonly connected to an end of each of said heat generating elements and to another end of adjacent heat generating element; a driving circuit for selectively providing positive or negative current to the common lines, said driving circuit actuates said heat generating elements by applying a high level potential and a low level potential to adjacent lines, respectively.
Claim 2
Dependent Claim
29 words
A recording head according to Claim 1, wherein said heat generating elements are classified into at least two blocks, and wherein adjacent heat generating elements belong to different blocks.
Claim 3
Dependent Claim
30 words
A recording head according to Claim 1, further comprising a reference line for determining the potential level of the conductive lines, wherein the potential of the reference line is changeable.
Claim 4
Dependent Claim
30 words
A recording head according to Claim 1, wherein the ink is ejected by creation of a bubble caused by film boiling by thermal energy applied by said heat generating element.
Claim 5
Dependent Claim
74 words
An ink jet recording head, comprising: plural resistors connected in series, said resistors generating thermal energy; lines connected to the opposite ends of the resistors, said lines are common to adjacent resistors; a driving circuit for selectively providing positive or negative current to the common lines, said driving circuit applying a high level potential to one of the ends of said resistor and a low level potential to the other ends of said resistor.
Claim 6
Dependent Claim
25 words
A recording head according to Claim 5, wherein said resistors are classified into at least two blocks, and wherein adjacent resistors belong to different blocks.
Claim 7
Dependent Claim
30 words
A recording head according to Claim 5, further comprising a reference line for determining the potential level of the conductive lines, wherein the potential of the reference line is changeable.
Claim 8
Dependent Claim
28 words
A recording head according to Claim 5, wherein the ink is ejected by creation of a bubble caused by film boiling by thermal energy applied by said resistor.
Claim 9
Dependent Claim
93 words
An ink jet recording head, comprising: a plurality of heat generating elements for ejecting ink using thermal energy; a conductive line commonly connected to an end of each of said heat generating elements and to another end of adjacent heat generating element; a driving circuit for selectively providing positive or negative current to the common lines, said driving circuit actuates said heat generating elements by applying a high level potential and a low level potential to adjacent lines, respectively; and switching means for selectively applying the low level and the high level signals.
Claim 10
Dependent Claim
29 words
A recording head according to Claim 9, wherein said heat generating elements are classified into at least two blocks, and wherein adjacent heat generating elements belong to different blocks.
Claim 11
Dependent Claim
30 words
A recording head according to Claim 9, wherein the ink is ejected by creation of a bubble caused by film boiling by thermal energy applied by said heat generating element.
Claim 12
Dependent Claim
111 words
A recording apparatus, comprising: an ink jet recording head including a plurality of heat generating elements for ejecting ink using thermal energy; a conductive line commonly connected to an end of each of said heat generating elements and to another end of adjacent heat generating element; a driving circuit for selectively providing positive or negative current to the common lines, said driving circuit actuates said heat generating elements by applying a high level potential and a low level potential to adjacent lines, respectively; a recording head mounting portion for mounting said recording head; feeding means for feeding a recording material to be subjected to a recording operation by said recording head.
Claim 13
Dependent Claim
29 words
An apparatus according to Claim 12, wherein the ink is ejected by a creation of a bubble by film boiling by thermal energy generated by said heat generating element.
Claim 14
Dependent Claim
95 words
An ink jet recording apparatus, comprising: an ink jet recording head including plural resistors connected in series, said resistors generating thermal energy; lines connected to the opposite ends of the resistors, said lines are common to adjacent resistors; a driving circuit for selectively providing positive or negative current to the common lines, said driving circuit applying a high level potential to one of the ends of said resistor and a low level potential to the other ends of said resistor; and switching means for selectively applying the low level potential and the high level potential.
Claim 15
Dependent Claim
35 words
An apparatus according to Claim 14, wherein said driving circuit comprises a bi-directional current switching circuit including complementary switching elements and an impedance element for controlling on and off timing of the complementary switching elements.
Claim 16
Dependent Claim
24 words
A bi-directional current switching circuit, comprising: complementary switching elements; and an impedance element for controlling on and off timing of said complementary switching elements.
Claim 17
Dependent Claim
59 words
A driving circuit, comprising: a first bi-directional current switching circuit including complementary switching elements and an impedance element for controlling on and off timing of the complementary switching elements; a second bi-directional current switching circuit for effecting complementary switching operation with said first bi-directional current switching circuit; and a load connected between said first and second current switching circuits.
Claim 18
Dependent Claim
35 words
A driving circuit according to Claim 17, wherein said load is in the form of a heat generating resistor for producing a droplet of ink produced by state change of ink caused by thermal energy.
Claim 19
Dependent Claim
21 words
A driving circuit according to Claim 18, wherein a heat generating portion of said resistor is directly contacted to the ink.
Claim 20
Dependent Claim
45 words
A print head having a wiring pattern of comparable size to the number of print generating elements of the head, in which the electric current supplied to the printing elements is distributed through the wiring pattern and not concentrated on a particular wire or wires.
Claim 21
Dependent Claim
28 words
A head according to claim 20, in which the current supplied through the wiring pattern is of alternating polarity, so as to reduce corrosion of the wiring pattern.
Claim 22
Dependent Claim
20 words
A print head in which the driving elements are serially connected for energisation so as to reduce the wiring pattern.
Claim 23
Dependent Claim
9 words
A print head comprising a bidirectional current switching circuit.
References Cited (Backward Citations)
No citation records indexed.
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