EP0452119B1
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Discharge recovery method for an ink jet recording head and device for carrying out the same
Assignee: Canon Inc
•
Filing: 1991-04-10
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Granted: 1996-03-06
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Expires: 2011-04-10
Abstract
Abstract This invention provides a novel and effective recovery method and device for an ink jet recording head, which method or device has the step of or means for carrying out substantially at a time a condition for driving discharge energy generating elements to discharge ink from the discharge ports of the head and a condition for effecting the forced discharge of the ink by a suction or pressing pump. According to the present invention, the pump itself can be made compact and moreover, the recovery process of all the discharge ports can be carried out reliably within a short time. <IMAGE>
Inventors
- 👤 Norifumi C/O Canon Kabushiki Kaisha Koitabashi
- 👤 Hitoshi C/O Canon Kabushiki Kaisha Sugimoto
- 👤 Hiroshi C/O Canon Kabushiki Kaisha Tajika
- 👤 Miyuki C/O Canon Kabushiki Kaisha Matsubara
- 👤 Atsushi C/O Canon Kabushiki Kaisha Arai
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-09 00:39
CPC Classifications
B; B41; B41J; B41J2/00; B41J2/005; B41J2/01; B41J2/135; B41J2/165; B41J2/16517; B41J2/1652; B41J2/16523; B41J2/16505; B41J2/16508; B41J2/14; B41J2/14016
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
75 words
A method of carrying out recovery processing on an ink jet recording head provided with discharge energy generating elements associated with a plurality of discharge ports (108), comprising: effecting, concurrently, the driving of said elements with a drive frequency lower than the frequency of normal recording to discharge ink from said discharge ports, and additionally causing forcible discharge of ink from the head through said ports by a method which does not employ said elements.
Claim 2
Dependent Claim
34 words
A method according to claim 1 and including a first step of heating ink in said recording head in response to the start of recovery processing and prior to effecting discharge of the ink.
Claim 3
Independent Claim
26 words
A method according to either of the preceding claims, wherein said elements are heat generating elements forming bubbles in the ink in response to drive signals.
Claim 4
Independent Claim
26 words
A method according to any one of the preceding claims, wherein said additional discharge is caused by effecting suction through a cap (300) covering said ports.
Claim 5
Dependent Claim
36 words
A method according to claim 4, wherein said suction is initiated during the growth of bubbles generated by said elements and is controlled such that the maximum suctioned force acts during the extinction of the bubbles.
Claim 6
Dependent Claim
87 words
Ink jet apparatus comprising: an ink jet recording head (86) having a plurality of discharge energy generating elements associated with discharge ports (108); means for driving said elements to effect recording on a recording medium; and discharge means (300, 500) other than said elements for forcibly effecting discharge of ink from said ports, and characterised in that there is additionally provided: means (800) for effecting recovery processing by driving said elements at a frequency lower than the frequency of normal recording concurrently with operating said discharge means.
Claim 7
Dependent Claim
20 words
Apparatus according to claim 5, wherein said head has an integral container for ink which houses an ink absorbing member.
Claim 8
Dependent Claim
23 words
Apparatus according to either of claims 6 or 7, wherein said elements are heat generating elements for causing film boiling in the ink.
References Cited (Backward Citations)
No citation records indexed.
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