Patent US4401993A successfully refreshed from Google Patents.
US4401993A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heat-sensitive type multi-gradation image recording apparatus
Assignee: Fujifilm Business Innovation Corp
•
Filing: 1981-08-24
•
Granted: 1983-08-30
•
Expires: 2001-08-24
Abstract
Abstract A heat-sensitive type multi-gradation image recording apparatus adapted for use with a conventional two-valued recording apparatus including a simple device for identifying image signal levels for recording multi-gradation images. A plurality of heat generating resistance elements are arranged one-dimensionally in correspondence to picture elements. A video signal is converted into a plurality of binary video signals using different threshold level values. Electrical energy is supplied to the heat generating elements controlled by the binary video signals to record and image in an overlap mode.
Inventors
- 👤 Haruhiko Moriguchi
- 👤 Takashi Ohmori
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 21:48
CPC Classifications
H; H04; H04N; H04N1/00; H04N1/40; H04N1/40025; H04N1/40031; H04N1/40043; H04N1/40087
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
116 words
A heat sensitive type multi-gradation image recording apparatus comprising: a plurality of heat generating resistance elements arranged one-dimensionally in correspondence to picture elements; means for converting a video signal into a plurality of binary video signals using different threshold values said means comprising a plurality of comparators being coupled commonly to receive said video signal, each of said comparators having a different threshold value, a switch having input contacts receiving outputs from said comparators, and a shift resistor having a serial input coupled to an output contact of said switch; and means for supplying electrical energy to said heat generating resistance elements controlled by said binary video signals to record an image in an overlap mode.
Claim 2
Dependent Claim
116 words
A heat sensitive type multi-gradation image recording apparatus comprising: a plurality of heat generating resistance elements arranged one-dimensionally in correspondence to picture elements; means for converting a video signal into a plurality of binary video signals using different threshold values said means comprising a plurality of comparators being coupled commonly to receive said video signal, each of said comparators having a different threshold value, a switch having input contacts receiving outputs from said comparators, and a shift resistor having a serial input coupled to an output contact of said switch; and means for supplying electrical energy to said heat generating resistance elements controlled by said binary video signals to record an image in an overlap mode.
Claim 3
Dependent Claim
24 words
The heat-sensitive type multi-gradation image recording apparatus of claim 1 wherein said switch has an input contact coupled to receive said video signal directly.
Claim 4
Dependent Claim
21 words
The heat-sensitive type multi-gradation image recording apparatus of claim 1 or 2 wherein said switch is sequenced among said input contacts.
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) | 1986-08-29 | 1987-02-28 | 1987-08-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-08-29 | 1991-02-28 | 1991-08-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-08-29 | 1995-02-28 | 1995-08-30 | $7700.00 | Window Closed / Lapsed |