GB1284939A - Electronic thermal devices for producing thermal patterns representing characters - Google Patents
Electronic thermal devices for producing thermal patterns representing charactersInfo
- Publication number
- GB1284939A GB1284939A GB4992369A GB4992369A GB1284939A GB 1284939 A GB1284939 A GB 1284939A GB 4992369 A GB4992369 A GB 4992369A GB 4992369 A GB4992369 A GB 4992369A GB 1284939 A GB1284939 A GB 1284939A
- Authority
- GB
- United Kingdom
- Prior art keywords
- matrix
- voltage
- character
- printing
- temp
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/04—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of a single character by selection from a plurality of characters, or by composing the character by combination of individual elements, e.g. segments using a combination of such display devices for composing words, rows or the like, in a frame with fixed character positions
- G09G3/16—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of a single character by selection from a plurality of characters, or by composing the character by combination of individual elements, e.g. segments using a combination of such display devices for composing words, rows or the like, in a frame with fixed character positions by control of light from an independent source
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
- B41J2/315—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective application of heat to a heat sensitive printing or impression-transfer material
- B41J2/32—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective application of heat to a heat sensitive printing or impression-transfer material using thermal heads
- B41J2/35—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective application of heat to a heat sensitive printing or impression-transfer material using thermal heads providing current or voltage to the thermal head
- B41J2/355—Control circuits for heating-element selection
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
- B41J2/315—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective application of heat to a heat sensitive printing or impression-transfer material
- B41J2/32—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective application of heat to a heat sensitive printing or impression-transfer material using thermal heads
- B41J2/35—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective application of heat to a heat sensitive printing or impression-transfer material using thermal heads providing current or voltage to the thermal head
- B41J2/355—Control circuits for heating-element selection
- B41J2/36—Print density control
- B41J2/365—Print density control by compensation for variation in temperature
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D23/00—Control of temperature
- G05D23/19—Control of temperature characterised by the use of electric means
- G05D23/20—Control of temperature characterised by the use of electric means with sensing elements having variation of electric or magnetic properties with change of temperature
- G05D23/2033—Control of temperature characterised by the use of electric means with sensing elements having variation of electric or magnetic properties with change of temperature details of the sensing element
- G05D23/2034—Control of temperature characterised by the use of electric means with sensing elements having variation of electric or magnetic properties with change of temperature details of the sensing element the sensing element being a semiconductor
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Computer Hardware Design (AREA)
- Theoretical Computer Science (AREA)
- Automation & Control Theory (AREA)
- Electronic Switches (AREA)
- Control Of Indicators Other Than Cathode Ray Tubes (AREA)
- Cathode-Ray Tubes And Fluorescent Screens For Display (AREA)
Abstract
1284939 Thermal type printing; selective printing TEXAS INSTRUMENTS Inc 10 Oct 1969 [31 Dec 1968] 49923/69 Heading H2H [Also in Division B6] In a printing apparatus for printing on thermally sensitive paper wherein a plurality of print heads 10a, 10b, 10c (Fig. 1) each head comprising four character matrices 12a-12d and each matrix a plurality of printing elements E1-E35 (Fig. 2 not shown) which are selectively heated to form a desired character, the energizing voltage and hence power fed to each element is controlled during a printing cycle to control its temperature in dependence upon the temperature of an element sensed by a respective controlling transistor T18 (Fig. 4) during a preceding sampling cycle. Each element, for instance element E18 of matrix 12a, is heated by current through a respective resistor e.g. R18 (Fig. 4) when a respective controlling transistor T18 is turned ON by a signal from a character generator 24 on the appropriate line C18. Each resistor and transistor is diffusion formed on the inner surface of a respective element and the elements are mounted on a common ceramic substrate below which is a common heat sink Fig. 2 (not shown). All the emitters of transistors T1-T35 of a matrix are connected to a supply line 20a-20d exclusive to that matrix. Each matrix may then be separately enabled by a character select switch 22. Temperature control.-The power applied to those elements of the enabled matrix selected by the character generator is controlled in accordance with the temp. of the centre element E18 thereof, immediately preceding the print cycle, so that a 'print' pulse of predetermined length will result in a uniform temp. regardless of the temp. of the matrix before the print cycle. The sampling procedure is effected for each character immediately preceding the print cycle thereof. During the short sampling cycle a constant current from a source 26 is applied to the control line C18 and through the base-emitter diode of T18 of the enabled matrix e.g. 12a. The voltage on the control line C18 will then be related to the temp. of base-emitter diode and thus to the temp. of the enabled matrix. When a 'sample' pulse is applied to an input 34 the voltage on line C18 is amplified at 28 and stored by a capacitor in a unit 30. During a print cycle pulse applied to input 36 the stored voltage, which is significant of sampled temperature, is applied to the non- inverting input of an amplifier 32 and a switch 38 turns ON a series regulator 40 to apply a voltage to line C18. This voltage magnitude has a predetermined relationship to the voltage stored, by virtue of a feedback loop 41 to the inverting input of amplifier 32. The character generator 24 is also activated during the print cycle to produce a positive voltage on the appropriate control lines C1 to C35 to cause a desired character to be generated by the enabled matrix 12a. Fig. 3 (not shown), illustrates in more detail the circuit of Fig. 4.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US78824968A | 1968-12-31 | 1968-12-31 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB1284939A true GB1284939A (en) | 1972-08-09 |
Family
ID=25143898
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB4992369A Expired GB1284939A (en) | 1968-12-31 | 1969-10-10 | Electronic thermal devices for producing thermal patterns representing characters |
Country Status (10)
Country | Link |
---|---|
JP (1) | JPS493209B1 (en) |
BE (1) | BE740852A (en) |
BR (1) | BR6914548D0 (en) |
CH (1) | CH504310A (en) |
DE (1) | DE1964389A1 (en) |
ES (1) | ES372686A1 (en) |
FR (1) | FR2027415A1 (en) |
GB (1) | GB1284939A (en) |
NL (1) | NL6916957A (en) |
SE (1) | SE355884B (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2003037632A1 (en) * | 2001-10-29 | 2003-05-08 | Therics, Inc. | A method and system for controlling the temperature of a dispensed liquid |
Families Citing this family (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3934695A (en) * | 1974-09-23 | 1976-01-27 | Hewlett-Packard Company | Method and apparatus for enhancing and maintaining character quality in thermal printers |
JPS5779761A (en) * | 1980-11-05 | 1982-05-19 | Sony Corp | Drive method for thermo-sensing picture display device |
JPS5779763A (en) * | 1980-11-06 | 1982-05-19 | Sony Corp | Drive method of thermo-sensing picture display device |
DE3741799A1 (en) * | 1987-12-07 | 1989-06-15 | Siemens Ag | THERMAL PRINTING PROCESS |
US5121135A (en) * | 1989-08-25 | 1992-06-09 | Sharp Kabushiki Kaisha | Thermal head having integral analog drive compensation |
DE9106277U1 (en) * | 1991-05-22 | 1991-09-26 | Alfa Institut AG, Rotkreuz | Cabinet door |
DE4225027C1 (en) * | 1992-07-29 | 1993-07-22 | Agoform Gmbh August Ottensmeyer, 4972 Loehne, De | Lightweight moisture resistant flat sheet for furniture - consists essentially of recycled polystyrene foam core bonded to polystyrene facing sheets so that its' complete structure can be recycled |
-
1969
- 1969-10-10 GB GB4992369A patent/GB1284939A/en not_active Expired
- 1969-10-18 ES ES372686A patent/ES372686A1/en not_active Expired
- 1969-10-27 BE BE740852D patent/BE740852A/xx unknown
- 1969-11-11 NL NL6916957A patent/NL6916957A/xx unknown
- 1969-11-26 BR BR21454869A patent/BR6914548D0/en unknown
- 1969-12-08 JP JP9791569A patent/JPS493209B1/ja active Pending
- 1969-12-10 FR FR6942725A patent/FR2027415A1/fr not_active Withdrawn
- 1969-12-16 CH CH1865369A patent/CH504310A/en not_active IP Right Cessation
- 1969-12-22 SE SE1775769A patent/SE355884B/xx unknown
- 1969-12-23 DE DE19691964389 patent/DE1964389A1/en active Pending
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2003037632A1 (en) * | 2001-10-29 | 2003-05-08 | Therics, Inc. | A method and system for controlling the temperature of a dispensed liquid |
US6945638B2 (en) | 2001-10-29 | 2005-09-20 | Therics, Inc. | Method and system for controlling the temperature of a dispensed liquid |
Also Published As
Publication number | Publication date |
---|---|
CH504310A (en) | 1971-03-15 |
FR2027415A1 (en) | 1970-09-25 |
SE355884B (en) | 1973-05-07 |
DE1964389A1 (en) | 1970-07-23 |
NL6916957A (en) | 1970-07-02 |
BE740852A (en) | 1970-04-01 |
ES372686A1 (en) | 1971-11-01 |
BR6914548D0 (en) | 1973-04-12 |
JPS493209B1 (en) | 1974-01-25 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PS | Patent sealed | ||
PLNP | Patent lapsed through nonpayment of renewal fees |