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US4366489A
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Thermal recording apparatus
Assignee: Ricoh Co Ltd
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Filing: 1981-01-23
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Granted: 1982-12-28
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Expires: 2001-01-23
Abstract
Abstract A thermal recording apparatus for use in a facsimile recording apparatus or the like. Thermal resistors arranged in a thermal recording head are divided into a predetermined number of groups. By group-selection circuits which constitute constant-voltage circuits and which are provided correspondingly to the groups of thermal resistors, the thermal resistors are actuated in a time-divisional manner so as to record image information on a thermosensitive recording paper, whereby each constant voltage circuit with a relatively small capacity is actuated in a time-divisional manner for driving the recording head. Thus, a regulated power supply apparatus with a large capacity is not required, so that the power consumption of the recording apparatus can be reduced and the size thereof can be decreased.
Inventors
- 👤 Shingo Yamaguchi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 18:53
CPC Classifications
H; H04; H04N; H04N1/00; H04N1/40; H04N1/40025; H04N1/40031; B; B41; B41J; B41J2/00; B41J2/315; B41J2/32; B41J2/35; C; C01; C01D; C01D15/00; C01D15/10
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
148 words
A thermal recording apparatus for forming images on a thermosensitive record paper by selectively applying electric power to a plurality of thermal resistors arranged in a recording head in accordance with image information to be recorded, comprising: said plurality of thermal resistors divided into a predetermined number of groups; a predetermined number of transistor means each including at least one transistor for independently supplying power to respective groups of said thermal resistors; and a clamping circuit for maintaining the base voltage of said transistors at a predetermined constant voltage when said thermal transistors are controlled so as to be in an electrically conductive state; wherein said predetermined number of transistor means are actuated in a time-divisional manner so as to supply a predetermined, constant electric power from a non-regulated D.C. power source selected of said plurality of thermal resistors in accordance with the image information to be recorded.
Claim 2
Dependent Claim
148 words
A thermal recording apparatus for forming images on a thermosensitive record paper by selectively applying electric power to a plurality of thermal resistors arranged in a recording head in accordance with image information to be recorded, comprising: said plurality of thermal resistors divided into a predetermined number of groups; a predetermined number of transistor means each including at least one transistor for independently supplying power to respective groups of said thermal resistors; and a clamping circuit for maintaining the base voltage of said transistors at a predetermined constant voltage when said thermal transistors are controlled so as to be in an electrically conductive state; wherein said predetermined number of transistor means are actuated in a time-divisional manner so as to supply a predetermined, constant electric power from a non-regulated D.C. power source selected of said plurality of thermal resistors in accordance with the image information to be recorded.
Claim 3
Dependent Claim
32 words
A thermal recording apparatus as claimed in claim 1, wherein each of said transistors is actuated in a time-divisional manner in accordance with a group-selection drive signal of a facsimile recording apparatus.
Claim 4
Dependent Claim
22 words
A thermal recording apparatus as claimed in claim 1, wherein each of said transistor means comprises: a pair of Darlington interconnected transistors.
Claim 5
Dependent Claim
25 words
A thermal recording apparatus as claimed in claim 1, wherein said clamping circuit comprises: a Zener diode which is shared by all of said transistors.
Claim 6
Dependent Claim
25 words
A thermal recording apparatus as claimed in claim 1, wherein said clamping circuit comprises: a constant-voltage circuit which is shared by all of said transistors.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-12-27 | 1986-06-28 | 1986-12-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-12-27 | 1990-06-28 | 1990-12-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-12-27 | 1994-06-28 | 1994-12-28 | $7700.00 | Window Closed / Lapsed |