US4462704A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Thermal heat driving system
Assignee: Fujifilm Business Innovation Corp
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Filing: 1982-12-03
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Granted: 1984-07-31
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Expires: 2002-12-03
Abstract
Abstract A thermal head driving system having a plurality of thermal heads, an electric power source commonly used to drive the heads at the same voltage. A pulse generator provided between the power source and each of the heads for producing a driving pulse having a width determined in accordance with a ratio of a resistance value of each thermal head. The plurality of thermal heads are accordingly driven by the respective driving pulses corresponding thereto to effectuate thermal recording.
Inventors
- 👤 Masami Kurata
- 👤 Toshiharu Inui
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 05:22
CPC Classifications
B; B41; B41J; B41J2/00; B41J2/315; B41J2/32; B41J2/35
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
101 words
A thermal head driving system comprising: at least first and second thermal heads, an electric power source used to drive said heads at the same voltage, means disposed between said power source and each of said heads for producing first and second driving pulses for said first and second heads respectively each of said pulses having widths determined such that the ratio of pulse widths is directly proportional to the ratio of resistance values of each of said thermal heads, wherein said first and second thermal heads are driven by said respective first and second driving pulses to effect thermal recording.
Claim 2
Dependent Claim
101 words
A thermal head driving system comprising: at least first and second thermal heads, an electric power source used to drive said heads at the same voltage, means disposed between said power source and each of said heads for producing first and second driving pulses for said first and second heads respectively each of said pulses having widths determined such that the ratio of pulse widths is directly proportional to the ratio of resistance values of each of said thermal heads, wherein said first and second thermal heads are driven by said respective first and second driving pulses to effect thermal recording.
Claim 3
Dependent Claim
18 words
The thermal head driving system of claim 1, wherein said power source is a constant voltage d.c. source.
Claim 4
Dependent Claim
56 words
The thermal head driving system of claim 2, wherein said means disposed between said power source and said heads comprises a driver associated with each thermal head receiving the constant voltage output from said source, and pulse width setting means for each driver to adjust the width of a driving pulse to a respective thermal head.
Claim 5
Dependent Claim
56 words
The thermal head driving system of claim 1, wherein said means disposed between said power source and said head comprises a driver associated with each thermal head receiving the constant voltage output from said source, and pulse width setting means for each driver to adjust the width of a driving pulse to a respective thermal head.
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) | 1987-07-31 | 1988-01-30 | 1988-07-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-07-31 | 1992-01-30 | 1992-07-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-07-31 | 1996-01-30 | 1996-07-31 | $7700.00 | Window Closed / Lapsed |