US3813677A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heat-sensitive record
Assignee: Panasonic Holdings Corp
•
Filing: 1973-02-20
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Granted: 1974-05-28
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Expires: 1993-02-20
Abstract
Abstract A heat-sensitive recorder using a thermal head, which is furnished with power in accordance with the speed of its movement relative to the recording sheet for the thermal control so as to obtain a uniform record quality.
Inventors
- 👤 W Shimotsuma
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 22:30
CPC Classifications
G; G01; G01D; G01D15/00; G01D15/10
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
139 words
A heat-sensitive recorder comprising a. a thermal head furnished with electrical power for heating, b. a heat-sensitive recording sheet disposed in contacted with a heat generating surface of said thermal head, c. means to move said thermal head and said heat sensitive recording sheet respectively, d. first detecting means to detect the distance traveled by said thermal head and to produce first trigger signals at intervals proportional to said detected distance, e. second detecting means to detect the distance traveled by said heat-sensitive recording sheet and to produce second trigger signals at intervals proportional to said detected distance, f. a pulse generator receiving said first and second trigger signals and producing a pulse output at controlled average pulse frequencies, and g. means to control power supplied to said thermal head according to the pulse output from said pulse generator.
Claim 2
Dependent Claim
139 words
A heat-sensitive recorder comprising a. a thermal head furnished with electrical power for heating, b. a heat-sensitive recording sheet disposed in contacted with a heat generating surface of said thermal head, c. means to move said thermal head and said heat sensitive recording sheet respectively, d. first detecting means to detect the distance traveled by said thermal head and to produce first trigger signals at intervals proportional to said detected distance, e. second detecting means to detect the distance traveled by said heat-sensitive recording sheet and to produce second trigger signals at intervals proportional to said detected distance, f. a pulse generator receiving said first and second trigger signals and producing a pulse output at controlled average pulse frequencies, and g. means to control power supplied to said thermal head according to the pulse output from said pulse generator.
Claim 3
Dependent Claim
39 words
A heat-sensitive recorder according to claim 1, wherein said thermal head consists of silicon and is provided with a superficial heat generating resistive layer formed by selectively diffusing such an impurity as phosphorus and boron into the silicon material.
Claim 4
Dependent Claim
30 words
A heat-sensitive recorder according to claim 1, wherein the heat generating surface of said thermal head is formed in the shape of a smooth curved-surface having a U-shaped cross section.
Claim 5
Dependent Claim
38 words
A heat-sensitive recorder according to claim 1, wherein the area of the heat generating surface of said thermal head is no greater than about three times the area of contact between said thermal head and heat-sensitive recording sheet.
Claim 6
Dependent Claim
51 words
A heat-sensitive recorder according to claim 1, wherein said heat-sensitive recording sheet is capable of changing the color of recording or record density, and which further comprises a control means to control power supplied to said thermal head such as to obtain records in various colors or with various record densities.
Claim 7
Dependent Claim
39 words
A heat-sensitive recorder according to claim 5, which further comprises means to compare the level of signals to be recorded and a particular reference level, the output signal from said comparing means being used to control said control means.
Claim 8
Dependent Claim
49 words
A heat-sensitive recorder according to claim 5, wherein said heat-sensitive recording sheet is a multi-color heat-sensitive sheet consisting of a base sheet and one or more coating layers formed on said base sheet and containing a leuco-die and a phenol compound or an organic acid as heat-sensitive coloring components.
Claim 9
Dependent Claim
48 words
A heat-sensitive recorder according to claim 5, which further comprises one or more additional thermal heads, and means to cause the movement of the individual thermal heads according to different input signals and supply energy of different levels to the individual thermal heads for recording in different colors.
Claim 10
Dependent Claim
86 words
A heat-sensitive recorder according to claim 1, wherein the rate of pulse supply with respect to the movement of said thermal head is within a range between 1 and 5 pulses per millimeter of movement of said thermal head and the rate of pulse supply with respect to the progress of said heat-sensitive recording sheet is within a range between 102 and 105 pulses per millimeter of progress of said recording sheet, the energy in each pulse being within a range between 1 and 5 millijoules.
Claim 11
Dependent Claim
32 words
A heat-sensitive recorder according to claim 1, which further comprises means to increase the pulse energy supplied to the thermal head during an initial recording period until normal recording conditions set in.
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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) | 1977-05-27 | 1977-11-26 | 1978-05-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-05-27 | 1981-11-26 | 1982-05-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-05-27 | 1985-11-26 | 1986-05-28 | $7700.00 | Window Closed / Lapsed |