US4896172A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Liquid injection recording apparatus including recording liquid circulation control
Assignee: Canon Inc
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Filing: 1988-11-16
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Granted: 1990-01-23
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Expires: 2008-11-16
Abstract
Abstract A liquid injection recording apparatus comprises a recording head having discharge ports for discharging recording liquid therethrough, a liquid path communicating with the discharge ports, a liquid chamber communicating with the liquid path and energy generating elements utilized for discharging the recording liquid, a temperature sensor for detecting the temperature of the recording head and/or the recording liquid in the recording head, a storing tank for storing the recording liquid to be supplied to the recording head, a communicating path for switchably communicating between a supply system for supplying the recording liquid from the storing tank to the liquid chamber and a circulation system for circulating the recording liquid between the storing tank and the liquid chamber, a switching device for switching the communicating path to either of the supply system or the circulation system in accordance with temperature information from the temperature sensor, and a control circuit for controlling the switch.
Inventors
- 👤 Minoru Nozawa
- 👤 Yutaka Koizumi
- 👤 Toshihiro Mori
- 👤 Atsushi Saito
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 21:32
CPC Classifications
B; B41; B41J; B41J2/00; B41J2/005; B41J2/01; B41J2/135; B41J2/14; B41J2/14016; B41J2/1408; B41J2/17; B41J2/195; B41J2002/14379; B41J2202/00; B41J2202/01; B41J2202/08; B41J2202/12
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
152 words
A liquid injection recording apparatus comprising a recording head having discharge ports for discharging recording liquid therethrough, a liquid path communicating with said discharge ports, a liquid chamber communicating with said liquid path and energy generating elements utilized for discharging said recording liquid; a temperature sensor for detecting the temperature of said recording head and/or said recording liquid in said recording head; a storing tank for storing said recording liquid to be supplied to said recording head; a communicating path for switchably communicating between a supply system for supplying said recording liquid from said storing tank to said liquid chamber and a circulation system for circulating said recording liquid between said storing tank and said liquid chamber; switching means for switching said communicating path to either of said supply system or said circulation system in accordance with temperature information from said temperature sensor; and a control circuit for controlling said switching means.
Claim 2
Dependent Claim
152 words
A liquid injection recording apparatus comprising a recording head having discharge ports for discharging recording liquid therethrough, a liquid path communicating with said discharge ports, a liquid chamber communicating with said liquid path and energy generating elements utilized for discharging said recording liquid; a temperature sensor for detecting the temperature of said recording head and/or said recording liquid in said recording head; a storing tank for storing said recording liquid to be supplied to said recording head; a communicating path for switchably communicating between a supply system for supplying said recording liquid from said storing tank to said liquid chamber and a circulation system for circulating said recording liquid between said storing tank and said liquid chamber; switching means for switching said communicating path to either of said supply system or said circulation system in accordance with temperature information from said temperature sensor; and a control circuit for controlling said switching means.
Claim 3
Dependent Claim
16 words
A liquid injection recording apparatus according to claim 1, wherein said switching means includes a valve.
Claim 4
Dependent Claim
23 words
A liquid injection recording apparatus according to claim 1, wherein said liquid chamber is communicated with said communicating path at least two locations.
Claim 5
Dependent Claim
19 words
A liquid injection recording apparatus according to claim 1, wherein said temperature sensor is provided in said recording head.
Claim 6
Dependent Claim
23 words
A liquid injection recording apparatus according to claim 1, wherein said energy generating elements are electrothermal energy generating elements for generating thermal energy.
Claim 7
Dependent Claim
25 words
A liquid injection recording apparatus according to claim 1, wherein said communicating path includes a pump for circulating said recording liquid in said circulating system.
Claim 8
Dependent Claim
158 words
A liquid injection recording apparatus comprising: a recording head having discharge ports for discharging recording liquid therethrough, a liquid path communicating with said discharge ports, a liquid chamber communicating with said liquid path, energy generating elements utilized for discharging said recording liquid and a sub chamber provided at least opposed to said liquid path; a temperature sensor for detecting the temperature of said recording head and/or said recording liquid to be supplied to said recording head; a storing tank for storing said recording liquid to be supplied to said recording head; a communicating path for communicating said storing tank with said recording liquid and said sub-chamber; switching means for switching said communicating path to either of a supply system for supplying said recording liquid from said storing tank to said recording head and a circulation system for circulating said recording liquid between said storing tank and said recording head; and a control circuit for controlling said switching means.
Claim 9
Dependent Claim
158 words
A liquid injection recording apparatus comprising: a recording head having discharge ports for discharging recording liquid therethrough, a liquid path communicating with said discharge ports, a liquid chamber communicating with said liquid path, energy generating elements utilized for discharging said recording liquid and a sub chamber provided at least opposed to said liquid path; a temperature sensor for detecting the temperature of said recording head and/or said recording liquid to be supplied to said recording head; a storing tank for storing said recording liquid to be supplied to said recording head; a communicating path for communicating said storing tank with said recording liquid and said sub-chamber; switching means for switching said communicating path to either of a supply system for supplying said recording liquid from said storing tank to said recording head and a circulation system for circulating said recording liquid between said storing tank and said recording head; and a control circuit for controlling said switching means.
Claim 10
Dependent Claim
16 words
A liquid injection recording apparatus according to claim 7, wherein said switching means includes a valve.
Claim 11
Dependent Claim
19 words
A liquid injection recording apparatus according to claim 7, wherein said temperature sensor is provided in said recording head.
Claim 12
Dependent Claim
18 words
A liquid injection recording apparatus according to claim 7, wherein said temperature sensor is provided in said sub-chamber.
Claim 13
Dependent Claim
23 words
A liquid injection recording apparatus according to claim 7, wherein said energy generating elements are electrothermal energy generating elements for generating thermal energy.
Claim 14
Dependent Claim
25 words
A liquid injection recording apparatus according to claim 7, wherein said communicating path includes a pump for circulating said recording liquid in said circulating system.
Claim 15
Dependent Claim
26 words
A liquid injection recording apparatus according to claim 7, wherein said liquid chamber and said sub-chamber are communicated with said communicating path at least two locations.
Claim 16
Dependent Claim
129 words
A liquid injection recording apparatus comprising: a recording head having discharge ports for discharging recording liquid therethrough, a liquid path communicating with said discharge ports, a liquid chamber communicating with said liquid path and energy generating elements utilized for discharging said recording liquid; a temperature sensor for detecting the temperature of said recording head and/or said recording liquid in said recording head; a communicating path connected to said recording head at both ends thereof and having a storing tank for storing said recording liquid; a pump provided in said communicating path; switching means provided in said communicating path for substantially connecting/disconnecting the flow of said recording liquid in said communicating path; and a control circuit for switching said switching means in accordance with temperature information from said temperature sensor.
Claim 17
Dependent Claim
129 words
A liquid injection recording apparatus comprising: a recording head having discharge ports for discharging recording liquid therethrough, a liquid path communicating with said discharge ports, a liquid chamber communicating with said liquid path and energy generating elements utilized for discharging said recording liquid; a temperature sensor for detecting the temperature of said recording head and/or said recording liquid in said recording head; a communicating path connected to said recording head at both ends thereof and having a storing tank for storing said recording liquid; a pump provided in said communicating path; switching means provided in said communicating path for substantially connecting/disconnecting the flow of said recording liquid in said communicating path; and a control circuit for switching said switching means in accordance with temperature information from said temperature sensor.
Claim 18
Dependent Claim
169 words
A liquid injection recording apparatus comprising: a recording head having discharge ports for discharging recording liquid therethrough, a liquid path communicating with said discharge ports, a liquid chamber communicating with said liquid path, energy generating elements utilized for discharging said recording liquid and a sub-chamber provided at least opposed to said liquid path; a temperature sensor for detecting the temperature of said recording head and/or said recording liquid in said recording head; a first communicating path connected to said recording head at both ends thereof and having a storing tank for storing said recording liquid; a plurality of second communicating paths each having one end of which is connected to said sub-chamber of said recording head and another end of which is connected to said first communicating path; switching means respectively provided in said first communicating path and said second communicating path for substantially connecting/disconnecting the flow of said recording liquid; and a control circuit for switching said switching means in accordance with temperature information from said temperature sensor.
Claim 19
Dependent Claim
169 words
A liquid injection recording apparatus comprising: a recording head having discharge ports for discharging recording liquid therethrough, a liquid path communicating with said discharge ports, a liquid chamber communicating with said liquid path, energy generating elements utilized for discharging said recording liquid and a sub-chamber provided at least opposed to said liquid path; a temperature sensor for detecting the temperature of said recording head and/or said recording liquid in said recording head; a first communicating path connected to said recording head at both ends thereof and having a storing tank for storing said recording liquid; a plurality of second communicating paths each having one end of which is connected to said sub-chamber of said recording head and another end of which is connected to said first communicating path; switching means respectively provided in said first communicating path and said second communicating path for substantially connecting/disconnecting the flow of said recording liquid; and a control circuit for switching said switching means in accordance with temperature information from said temperature sensor.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-01-22 | 1993-07-24 | 1994-01-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-01-22 | 1997-07-24 | 1998-01-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-01-22 | 2001-07-24 | 2002-01-23 | $7700.00 | Window Closed / Lapsed |