WO2016107657A1 - A battery lifetime enhancement arrangement for a thermal printer - Google Patents
A battery lifetime enhancement arrangement for a thermal printer Download PDFInfo
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- WO2016107657A1 WO2016107657A1 PCT/EP2014/079492 EP2014079492W WO2016107657A1 WO 2016107657 A1 WO2016107657 A1 WO 2016107657A1 EP 2014079492 W EP2014079492 W EP 2014079492W WO 2016107657 A1 WO2016107657 A1 WO 2016107657A1
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- Prior art keywords
- battery
- unit
- thermal printer
- printer
- current
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- 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
Definitions
- the present invention relates to a thermal printer having a built-in battery with economic mode capabilities, dynamically adjusting the printer’s electrical parameters to benefit from its battery capacity more efficiently.
- thermal printers effect the printing operation by way of heating a thermal paper in the manner that heated areas of the paper turn black while the thermal print head generates heat and prints on the paper.
- the voltage range is typically 4.2V to 2.5V.
- a printer performing between 3.0 V to 2.5V reduces the lifetime of the battery dramatically since the range accounts for a very small part of total capacity of the battery. Therefore, the printers are commonly performed between the range of 4.2V and 3.0V to increase the lifetime of the batteries.
- a converter/amplifier is needed to drive the printer.
- the printer driver periodically draws high amplitude current from the battery. Nevertheless, quick pulses of high amplitude current cause decreases in the lifetime capacity of the battery.
- the internal resistance of the battery increases as the battery deteriorates over time and loses its capacity. In other words, the more current in the form of quick pulses of high amplitude current drawn from the battery, the shorter lifetime capacity the battery will have.
- the batteries conventionally perform at temperatures of 20 - 70 0 C; however, the optimum temperature for a battery to perform is between 20 and 40 0 C. Decrease in the operational temperature of the battery results with increase in the internal resistance and thus decreases the capacity and high discharge rate performance of the battery.
- single cell battery powered thermal printers voltage is supplied from a pulse amplifier.
- the printer supplies a certain fixed power from the battery and this causes more current drawn from the battery as the battery voltage decreases.
- US8553055 discloses a thermal printer operated to adjust the level of energy applied to print elements of a print head of the printer in response to selected changes in signals corresponding to the voltage from a power source used to provide energy to the printing elements. Voltage changes that occur during printing of a print can be ignored. In addition, voltage changes occurring when a printer is not being powered by a battery can be also ignored. Rapid decreases in voltage of the power source can be detected and accounted for. In addition, increasing voltages of the power source can also be determined and accounted for.
- the present invention provides a thermal printer featuring an economic mode of operation as defined by the characterizing features in Claim 1 and subsequent Claims.
- Primary object of the present invention is to provide a thermal printer comprising a built-in battery with an economic mode operation function effective in dynamically adjusting the printer’s parameters to benefit from its battery capacity more efficiently.
- the present invention proposes a thermal printer having a built-in battery involving a more economic mode of operation, the thermal printer comprising a battery control unit in the form of a processor to regulate battery current parameters during operation of the printer to benefit from the capacity of the battery in a more efficient manner.
- the present invention proposes a thermal printer with a printer driving unit electrically connected with a battery unit of the printer, whereby current pulses in the form of a pulse train are fed to a printer driving unit, the latter supplying power to the thermal printer.
- a battery control unit is provided in electrical communication with the printer driving unit and also electrically connected with the battery unit to monitor the battery voltage and the current being drawn by the printer driving unit on a continual basis to dynamically provide that the amplitude of rectangular wave pulse current drawn from the battery unit is decreased by the printer driving unit.
- the printer driving unit further provides that the pulse durations of the pulse train are increased as the amplitude of current pulses decreases.
- the battery voltage, the current amplitude and the pulse duration parameters hence being dynamically processed, the amount of energy delivered to the printing unit is maintained constant to ensure printing quality.
- the battery control unit additionally periodically obtains temperature readings from the battery unit and also executes the control method by adjusting the amplitude of the pulse current as well as the pulse duration
- Fig. 1 demonstrates a general graph of voltage and battery capacity with used and maximum capacities.
- Fig. 2 demonstrates a general graph of the internal resistance (m ⁇ ) of a Li-Ion battery voltage versus temperature.
- Fig. 3 demonstrates a general block diagram of the main components of the thermal printer driving system according to the present invention.
- Fig. 4 demonstrates a general graph of the impedance of the battery versus state of charge thereof.
- Fig. 5 demonstrates different sets of thermal printer current pulses with different amplitudes and pulse durations according to the present invention.
- Fig. 6 demonstrates a general graph of voltage versus battery capacity where the battery capacity is improved according to the present invention.
- the present invention relates to a thermal printer (1) as will be delineated below.
- thermal printers (1) effect the printing operation by way of heating a coated, thermally responsive paper in the manner that heated areas of the paper turn black while a thermal print head generates heat and prints on the paper.
- Thermal printers (1) use heated pins to burn onto heat-sensitive paper. More particularly a thermal printer (1) prints by burning dots when the coated paper passes over a set of heating elements.
- a thermal printer (1) is proposed; the thermal printer (1) having a battery unit (3) in the form of a single-cell Li-Ion battery.
- a battery control unit (4) oversees the operation of the thermal printer (1) by way of controlling a printer driving unit (2).
- the printer driving unit (2) periodically draws high amplitude current in the form of current pulses from the battery unit (3) in order for supplying the thermal printer (1).
- Fig. 5 demonstrates different sets of thermal printer current pulses with different amplitudes and pulse durations according to the present invention.
- a pulse train with a current amplitude of A 1 and a pulse duration of t 1 is seen.
- the amplitude of the current supplied by the battery unit (3) increases as the battery voltage decreases and the power being drawn from the battery unit (3) is constant, the amplitude of current can exceed the value of the instantaneous current that the battery unit (3) can supply. Due to the internal resistance of the battery unit (3), these high amplitude pulses cause decreases in the usable capacity of the battery unit (3). In other words, the more current in the form of quick pulses of high amplitude current drawn from the battery unit (3), the shorter lifetime capacity the battery unit (3) will have.
- the battery control unit (4) periodically monitors the battery voltage and the current being drawn on a continual basis.
- the battery control unit (4) in signal communication with the printer driving unit (2) provides that the amplitude of the rectangular wave pulse current drawn from the battery unit (3) is decreased by the printer driving unit (2), advantageously featuring a positive effect on the lifetime of the battery unit (3), also decreasing power losses on the internal resistance of the battery unit (3).
- the pulse train’s amplitude is decreased to enhance the capacity of the battery unit (3).
- the pulse durations are modified. In other words, as the amplitude of current pulses decreases, the printed material may come out faded and not dark black.
- the thermal printer (1) should supply an equal amount of energy to the paper.
- the printer driving unit (2) ensures that the pulse durations of the pulse train are increased.
- the battery control unit (4) evaluates the battery voltage, the current amplitude and the pulse duration parameters in order for calculating the amount of energy required to obtain an acceptable printing quality. Therefore, as the amplitude of the current is decreased, the pulse duration is dynamically proportionately increased. In spite of the fact that this would have a slight effect in extending the printing time, the added time is not seen as a quality problem as the capacity of the thermal printer’s (1) battery unit (3) is extended.
- the battery control unit (4) periodically obtains temperature readings from the surface of the battery unit (3) so as to adjust the amplitude of the pulse current as well as the pulse duration.
- the battery control unit (4) in signal communication with the printer driving unit (2) provides that the amplitude of the pulse current is decreased whereas the pulse duration is increased in a proportional manner.
- the present invention proposes a thermal printer (1) to effect the printing operation by heating a thermally responsive paper in the manner that heated areas of the paper are printed by a printing unit (5), the thermal printer (1) comprising a battery unit (3) powering the printing unit (5) and a printer driving unit (2) drawing current from the battery unit (3) in the form of current pulses to supply the printing unit (5).
- a battery control unit (4) in electrical communication with the printer driving unit (2) oversees the operation of the thermal printer (1) in the manner that it monitors the battery voltage and the current being drawn on a continual basis to provide that the amplitude of rectangular wave pulse current drawn from the battery unit (3) is decreased by the printer driving unit (2).
- the printer driving unit (2) provides that the pulse durations of the pulse train are increased as the amplitude of current pulses decreases.
- the battery voltage, the current amplitude and the pulse duration parameters are dynamically processed to maintain the amount of energy delivered to the printing unit (5) constant.
- the amplitude of the current is decreased and the pulse duration is dynamically proportionately increased.
- the battery control unit (4) additionally periodically obtains temperature readings from the battery unit (3) so as to adjust the amplitude of the pulse current as well as the pulse duration.
- the battery unit (3) is in the form of a single-cell Li-Ion battery.
- the present invention proposes a thermal printer (1) having a built-in battery unit (3) involving a more economic mode of operation, the thermal printer (1) comprising a battery control unit (4) in the form of a processor to regulate the battery unit (3) parameters such as the pulse current amplitude and the pulse duration during operation of the thermal printer (1) to benefit from the capacity of the battery in a more efficient manner.
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Abstract
The present invention relates to a thermal printer (1) having a built-in battery unit (3) with economic mode capabilities, dynamically adjusting the printer's electrical parameters to benefit from its battery capacity more efficiently. The present invention more particularly relates to a thermal printer (1) to effect the printing operation by heating a thermally responsive paper in the manner that heated areas of the paper are printed by a printing unit (5), the thermal printer (1) comprising a battery unit (3) powering the printing unit (5) and a printer driving unit (2) drawing current from the battery unit (3) in the form of current pulses to supply the printing unit (5).
Description
The present invention relates to a thermal printer having a built-in battery with economic mode capabilities, dynamically adjusting the printer’s electrical parameters to benefit from its battery capacity more efficiently.
As widely known, thermal printers effect the printing operation by way of heating a thermal paper in the manner that heated areas of the paper turn black while the thermal print head generates heat and prints on the paper.
In a thermal printer powered by a single cell Li-Ion battery power source, the voltage range is typically 4.2V to 2.5V. A printer performing between 3.0 V to 2.5V reduces the lifetime of the battery dramatically since the range accounts for a very small part of total capacity of the battery. Therefore, the printers are commonly performed between the range of 4.2V and 3.0V to increase the lifetime of the batteries.
In thermal printers operating with a single cell battery, a converter/amplifier is needed to drive the printer. The printer driver periodically draws high amplitude current from the battery. Nevertheless, quick pulses of high amplitude current cause decreases in the lifetime capacity of the battery. The internal resistance of the battery increases as the battery deteriorates over time and loses its capacity. In other words, the more current in the form of quick pulses of high amplitude current drawn from the battery, the shorter lifetime capacity the battery will have.
The batteries conventionally perform at temperatures of 20 - 700C; however, the optimum temperature for a battery to perform is between 20 and 40 0C. Decrease in the operational temperature of the battery results with increase in the internal resistance and thus decreases the capacity and high discharge rate performance of the battery.
In prior art applications, single cell battery powered thermal printers’ voltage is supplied from a pulse amplifier. In those applications, the printer supplies a certain fixed power from the battery and this causes more current drawn from the battery as the battery voltage decreases.
Among others, a prior art publication in the technical field of the invention may be referred to as US8553055, which discloses a thermal printer operated to adjust the level of energy applied to print elements of a print head of the printer in response to selected changes in signals corresponding to the voltage from a power source used to provide energy to the printing elements. Voltage changes that occur during printing of a print can be ignored. In addition, voltage changes occurring when a printer is not being powered by a battery can be also ignored. Rapid decreases in voltage of the power source can be detected and accounted for. In addition, increasing voltages of the power source can also be determined and accounted for.
The present invention provides a thermal printer featuring an economic mode of operation as defined by the characterizing features in Claim 1 and subsequent Claims.
Primary object of the present invention is to provide a thermal printer comprising a built-in battery with an economic mode operation function effective in dynamically adjusting the printer’s parameters to benefit from its battery capacity more efficiently.
The present invention proposes a thermal printer having a built-in battery involving a more economic mode of operation, the thermal printer comprising a battery control unit in the form of a processor to regulate battery current parameters during operation of the printer to benefit from the capacity of the battery in a more efficient manner.
The present invention proposes a thermal printer with a printer driving unit electrically connected with a battery unit of the printer, whereby current pulses in the form of a pulse train are fed to a printer driving unit, the latter supplying power to the thermal printer.
A battery control unit is provided in electrical communication with the printer driving unit and also electrically connected with the battery unit to monitor the battery voltage and the current being drawn by the printer driving unit on a continual basis to dynamically provide that the amplitude of rectangular wave pulse current drawn from the battery unit is decreased by the printer driving unit. The printer driving unit further provides that the pulse durations of the pulse train are increased as the amplitude of current pulses decreases.
The battery voltage, the current amplitude and the pulse duration parameters hence being dynamically processed, the amount of energy delivered to the printing unit is maintained constant to ensure printing quality. Moreover, the battery control unit additionally periodically obtains temperature readings from the battery unit and also executes the control method by adjusting the amplitude of the pulse current as well as the pulse duration
Accompanying drawings are given solely for the purpose of exemplifying a thermal printer with an economic mode of operation, whose advantages over prior art were outlined above and will be explained in brief hereinafter.
The drawings are not meant to delimit the scope of protection as identified in the Claims, nor should they be referred to alone in an effort to interpret the scope identified in the Claims without recourse to the technical disclosure in the description of the present invention.
Fig. 1 demonstrates a general graph of voltage and battery capacity with used and maximum capacities.
Fig. 2 demonstrates a general graph of the internal resistance (mΩ) of a Li-Ion battery voltage versus temperature.
Fig. 3 demonstrates a general block diagram of the main components of the thermal printer driving system according to the present invention.
Fig. 4 demonstrates a general graph of the impedance of the battery versus state of charge thereof.
Fig. 5 demonstrates different sets of thermal printer current pulses with different amplitudes and pulse durations according to the present invention.
Fig. 6 demonstrates a general graph of voltage versus battery capacity where the battery capacity is improved according to the present invention.
The following numerals assigned to different parts as demonstrated in the technical drawings are referred to in the detailed description:
1) Thermal printer
2) Printer driving unit
3) Battery unit
4) Battery control unit
5) Printing unit
The present invention relates to a thermal printer (1) as will be delineated below.
As widely known, thermal printers (1) effect the printing operation by way of heating a coated, thermally responsive paper in the manner that heated areas of the paper turn black while a thermal print head generates heat and prints on the paper. Thermal printers (1) use heated pins to burn onto heat-sensitive paper. More particularly a thermal printer (1) prints by burning dots when the coated paper passes over a set of heating elements.
According to the present invention, a thermal printer (1) is proposed; the thermal printer (1) having a battery unit (3) in the form of a single-cell Li-Ion battery. A battery control unit (4) oversees the operation of the thermal printer (1) by way of controlling a printer driving unit (2).
The printer driving unit (2) periodically draws high amplitude current in the form of current pulses from the battery unit (3) in order for supplying the thermal printer (1). Fig. 5 demonstrates different sets of thermal printer current pulses with different amplitudes and pulse durations according to the present invention.
According to Fig. 5, a pulse train with a current amplitude of A1 and a pulse duration of t1 is seen. As the amplitude of the current supplied by the battery unit (3) increases as the battery voltage decreases and the power being drawn from the battery unit (3) is constant, the amplitude of current can exceed the value of the instantaneous current that the battery unit (3) can supply. Due to the internal resistance of the battery unit (3), these high amplitude pulses cause decreases in the usable capacity of the battery unit (3). In other words, the more current in the form of quick pulses of high amplitude current drawn from the battery unit (3), the shorter lifetime capacity the battery unit (3) will have.
According to the present invention, the battery control unit (4) periodically monitors the battery voltage and the current being drawn on a continual basis. The battery control unit (4) in signal communication with the printer driving unit (2) provides that the amplitude of the rectangular wave pulse current drawn from the battery unit (3) is decreased by the printer driving unit (2), advantageously featuring a positive effect on the lifetime of the battery unit (3), also decreasing power losses on the internal resistance of the battery unit (3).
According to the invention, the pulse train’s amplitude is decreased to enhance the capacity of the battery unit (3). To compensate for this loss of energy delivered to the printer driving unit (2), which might have a direct impact on the printing quality and particularly the blackness of printed material, the pulse durations are modified. In other words, as the amplitude of current pulses decreases, the printed material may come out faded and not dark black. To maintain a high level of blackness, the thermal printer (1) should supply an equal amount of energy to the paper.
To address the above-mentioned problem according to the invention, the printer driving unit (2) ensures that the pulse durations of the pulse train are increased. In this regard, the battery control unit (4) evaluates the battery voltage, the current amplitude and the pulse duration parameters in order for calculating the amount of energy required to obtain an acceptable printing quality. Therefore, as the amplitude of the current is decreased, the pulse duration is dynamically proportionately increased. In spite of the fact that this would have a slight effect in extending the printing time, the added time is not seen as a quality problem as the capacity of the thermal printer’s (1) battery unit (3) is extended.
Additionally, it is known that decrease in the operational temperature of the battery units (3) will result with increase in the internal resistance thereof and will thus decrease the capacity and high discharge rate performance of the battery unit (3). According to the present invention, the battery control unit (4) periodically obtains temperature readings from the surface of the battery unit (3) so as to adjust the amplitude of the pulse current as well as the pulse duration. The battery control unit (4) in signal communication with the printer driving unit (2) provides that the amplitude of the pulse current is decreased whereas the pulse duration is increased in a proportional manner.
As the internal resistance of the battery unit (3) increases as it deteriorates over time and loses its capacity, decreasing the amplitude of the pulse current will further contribute to the lifetime of the battery unit (3) in the case of older batteries.
Consequently, the present invention proposes a thermal printer (1) to effect the printing operation by heating a thermally responsive paper in the manner that heated areas of the paper are printed by a printing unit (5), the thermal printer (1) comprising a battery unit (3) powering the printing unit (5) and a printer driving unit (2) drawing current from the battery unit (3) in the form of current pulses to supply the printing unit (5).
In one embodiment of the present invention, a battery control unit (4) in electrical communication with the printer driving unit (2) oversees the operation of the thermal printer (1) in the manner that it monitors the battery voltage and the current being drawn on a continual basis to provide that the amplitude of rectangular wave pulse current drawn from the battery unit (3) is decreased by the printer driving unit (2).
In a further embodiment of the present invention, the printer driving unit (2) provides that the pulse durations of the pulse train are increased as the amplitude of current pulses decreases.
In a further embodiment of the present invention, the battery voltage, the current amplitude and the pulse duration parameters are dynamically processed to maintain the amount of energy delivered to the printing unit (5) constant.
In a further embodiment of the present invention, the amplitude of the current is decreased and the pulse duration is dynamically proportionately increased.
In a further embodiment of the present invention, the battery control unit (4) additionally periodically obtains temperature readings from the battery unit (3) so as to adjust the amplitude of the pulse current as well as the pulse duration.
In a further embodiment of the present invention, the battery unit (3) is in the form of a single-cell Li-Ion battery.
Therefore, the present invention proposes a thermal printer (1) having a built-in battery unit (3) involving a more economic mode of operation, the thermal printer (1) comprising a battery control unit (4) in the form of a processor to regulate the battery unit (3) parameters such as the pulse current amplitude and the pulse duration during operation of the thermal printer (1) to benefit from the capacity of the battery in a more efficient manner.
Claims (6)
- A thermal printer (1) to effect the printing operation by heating a thermally responsive paper in the manner that heated areas of the paper are printed by a printing unit (5), the thermal printer (1) comprising a battery unit (3) powering the printing unit (5) and a printer driving unit (2) drawing current from the battery unit (3) in the form of current pulses to supply the printing unit (5), characterized in thata battery control unit (4) in electrical communication with the printer driving unit (2) oversees the operation of the thermal printer (1) in the manner that it monitors the battery voltage and the current being drawn on a continual basis to provide that the amplitude of rectangular wave pulse current drawn from the battery unit (3) is decreased by the printer driving unit (2).
- A thermal printer (1) as in Claim 1, characterized in that the printer driving unit (2) provides that the pulse durations of the pulse train are increased as the amplitude of current pulses decreases.
- A thermal printer (1) as in Claim 2, characterized in that the battery voltage, the current amplitude and the pulse duration parameters are dynamically processed to maintain the amount of energy delivered to the printing unit (5) constant.
- A thermal printer (1) as in Claim 3, characterized in that the amplitude of the current is decreased and the pulse duration is dynamically proportionately increased.
- A thermal printer (1) as in Claim 2, characterized in that the battery control unit (4) additionally periodically obtains temperature readings from the battery unit (3) so as to adjust the amplitude of the pulse current as well as the pulse duration
- A thermal printer (1) as in Claim 1, characterized in that the battery unit (3) is in the form of a single-cell Li-Ion battery.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/EP2014/079492 WO2016107657A1 (en) | 2014-12-31 | 2014-12-31 | A battery lifetime enhancement arrangement for a thermal printer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/EP2014/079492 WO2016107657A1 (en) | 2014-12-31 | 2014-12-31 | A battery lifetime enhancement arrangement for a thermal printer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO2016107657A1 true WO2016107657A1 (en) | 2016-07-07 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/EP2014/079492 WO2016107657A1 (en) | 2014-12-31 | 2014-12-31 | A battery lifetime enhancement arrangement for a thermal printer |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4590485A (en) * | 1983-07-29 | 1986-05-20 | Canon Kabushiki Kaisha | Thermal recorder |
| DE4003595A1 (en) * | 1990-02-02 | 1991-08-08 | Siemens Ag | Thermal printing system - has heating element period determined by load and internal resistance of battery |
| US20120098916A1 (en) * | 2010-10-22 | 2012-04-26 | Noriyoshi Shoji | Printing apparatus |
| US8553055B1 (en) | 2011-10-28 | 2013-10-08 | Graphic Products, Inc. | Thermal printer operable to selectively control the delivery of energy to a print head of the printer and method |
-
2014
- 2014-12-31 WO PCT/EP2014/079492 patent/WO2016107657A1/en active Application Filing
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4590485A (en) * | 1983-07-29 | 1986-05-20 | Canon Kabushiki Kaisha | Thermal recorder |
| DE4003595A1 (en) * | 1990-02-02 | 1991-08-08 | Siemens Ag | Thermal printing system - has heating element period determined by load and internal resistance of battery |
| US20120098916A1 (en) * | 2010-10-22 | 2012-04-26 | Noriyoshi Shoji | Printing apparatus |
| US8553055B1 (en) | 2011-10-28 | 2013-10-08 | Graphic Products, Inc. | Thermal printer operable to selectively control the delivery of energy to a print head of the printer and method |
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