US3913091A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Thermal sensitive printing head
Assignee: Suwa Seikosha KK
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Filing: 1973-12-19
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Granted: 1975-10-14
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Expires: 1993-12-19
Abstract
Abstract A thermal sensitive printing head for use with information storage and retrieval systems is provided. A thermal sensitive recording head including a base plate having a high resistance, and a plurality of exothermic elements disposed thereon are thermally activated by circuit elements coupled to the exothermic elements. The base plate is formed with certain properties whereby heat is accumulated to thereby raise the temperature of the exothermic elements so as to render same particularly suited for printing on a thermal sensitive recording medium in coordinate relationship therewith. The circuit means are further adapted to pulse the plurality of exothermic elements in a certain manner to improve the operation thereof.
Inventors
- 👤 Susumu Aizawa
- 👤 Yoshikiyo Futagawa
- 👤 Takemasa Shindo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 16:05
CPC Classifications
B; B41; B41J; B41J2/00; B41J2/315; B41J2/32; B41J2/35; B41J2/355; B41J2/345
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
113 words
An exothermic printing head adapted to print on a thermally sensitive recording element, comprising a base plate formed from electrically high-resistance material, a plurality of exothermic elements disposed thereon, and circuit means coupled to said elements to apply pulse signals thereto corresponding to information to be printed the pulse width of each said pulse being insufficient to heat said exothermic elements to print on said heat sensitive medium, said base plate having a thermal conductivity less than 0.006 cal/cm.sec.*C and being adapted in response to the application of at least two pulses to said exothermic elements to accumulate sufficient heat to effect printing by said exothermic elements on a thermally sensitive recording element.
Claim 2
Dependent Claim
113 words
An exothermic printing head adapted to print on a thermally sensitive recording element, comprising a base plate formed from electrically high-resistance material, a plurality of exothermic elements disposed thereon, and circuit means coupled to said elements to apply pulse signals thereto corresponding to information to be printed the pulse width of each said pulse being insufficient to heat said exothermic elements to print on said heat sensitive medium, said base plate having a thermal conductivity less than 0.006 cal/cm.sec.*C and being adapted in response to the application of at least two pulses to said exothermic elements to accumulate sufficient heat to effect printing by said exothermic elements on a thermally sensitive recording element.
Claim 3
Dependent Claim
29 words
An exothermic printing head as claimed in claim 1, wherein said base plate is formed from a member of the group consisting of mullite, silicon oxide and epoxy resins.
Claim 4
Dependent Claim
18 words
A thermally sensitive printing head as claimed in claim 2, wherein said base plate is formed from mullite.
Claim 5
Dependent Claim
30 words
A thermally sensitive printing head as claimed in claim 1, wherein said base plate is formed of a thickness selected to render the thermal conductivity thereof below 0.006 cal/cm. sec.*C.
Claim 6
Dependent Claim
40 words
An exothermic printing head as claimed in claim 1 wherein said plurality of pulses applied by said circuit means have a 1 millisec. pulse width and a duty cycle less than one-half in order to print the information corresponding thereto.
Claim 7
Dependent Claim
29 words
An exothermic printing head as claimed in claim 5, wherein the exothermic elements form a segmented digit which is adapted to print a letter, numeral, signal or the like.
Claim 8
Dependent Claim
17 words
An exothermic printing head as claimed in claim 5, wherein the duty cycle is less than 1/10.
Claim 9
Dependent Claim
38 words
A thermally sensitive printing head as claimed in claim 7, wherein said printing heads are coupled through said circuit means to the main register of a computer to thereby render same capable of printing the contents stored therein.
Claim 10
Dependent Claim
53 words
An exothermic printing head as claimed in claim 8, wherein the circuit means includes a segment driver disposed so as to receive signals from the main register and apply same to the segmented exothermic elements, and digit driver means for receiving signals from the main register for selecting the digits to be printed.
Claim 11
Dependent Claim
39 words
An exothermic printing head as claimed in claim 9, including a flip-flop and a logic gate adapted to control the information supplied from the main register to the printing head during a single cycle of the main memory register.
Claim 12
Dependent Claim
30 words
An exothermic printing head as claimed in claim 6, wherein the base plate is formed with concave and convex portions, the exothermic elements beinG disposed on the convex portions thereof.
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) | 1978-10-13 | 1979-04-14 | 1979-10-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-10-13 | 1983-04-14 | 1983-10-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-10-13 | 1987-04-14 | 1987-10-14 | $7700.00 | Window Closed / Lapsed |