CN1328061C - Print control equipment and method for printing with the same equipment - Google Patents
Print control equipment and method for printing with the same equipment Download PDFInfo
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- CN1328061C CN1328061C CNB021264309A CN02126430A CN1328061C CN 1328061 C CN1328061 C CN 1328061C CN B021264309 A CNB021264309 A CN B021264309A CN 02126430 A CN02126430 A CN 02126430A CN 1328061 C CN1328061 C CN 1328061C
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Abstract
The present invention relates to a printing control device and a method thereof. The printing control device comprises a heat sensing head, a control circuit, a circuit, an analog/digital conversion circuit, an adder, a comparator and a circuit, wherein the heat sensing head is provided with a set of micro heating elements and a driving circuit; the micro heating elements can be used as heating elements as well as can be used as temperature detectors; the driving circuit provides electric current to drive the heating elements; the control circuit is used for converting the electric current provided for all the heating elements between a heating driving state and a temperature detecting state; the circuit can convert the temperature values of all the heating elements into voltage values and can also utilize electric current flowing at the time of the temperature detecting state to detect a voltage value. The analog/digital conversion circuit is used for converting a voltage to a digital value; the adder used for cumulatively calculating a digital value obtained by the conversion of digital. The comparator is used for comparing the cumulated value obtained by the adder with a target printing density value of predefined point which is preset, is delivered by a previous-stage device, and is correspondingly to be printed; when the target printing density value detected by the comparator is reached, the circuit can stop the heating drive of the heating elements.
Description
Technical field
The present invention relates to print control unit and method, can be used for controlling the heat energy of the thermal head that offers print apparatus, thermal head can be according to the heat that applies Show Color on medium by different level, or the fusing transfer printing (fusion transfer) by utilizing the intermediate heat transfer film or sublimation transfer carry out image conversion and print.
Background technology
Traditionally, the method of controlling for the heat energy that is applied on the thermal recording material, usually use generally is called the method for " heat history control ", wherein the temperature of deciding the resistance heating element heater on the thermal head is to estimate according to the history of printing information in past, with this resistance element of deciding on thermal head is controlled the heat that produces.
The method is undertaken by estimating, therefore, because the heat radiation condition difference between cold-zone and hot-zone print, therefore the temperature of paper dielectric surface also changes, so exist the problem that is easy to generate departure.Therefore, because control is according to implementing based on the calculating of estimating to carry out, being difficult to obtain high accuracy and stable printing control.
Also have another kind of method, alloy wherein is as the material of its resistance of this class of chromium, aluminium or metalloid with temperature change, form thermal head as heating element heater, and during printing, its temperature is measured, made that being no longer dependent on history of printing prints control.Yet in this method, the control target is not the heat energy value that heating element heater produces, but utilizes detected temperature data to control, and therefore exists the problem that can not accurately control the colour developing density on the thermal recording media.
In addition, also be necessary the print density error that occurs is handled, because, the fact in road as known, the development properties of thermal recording material is called
There is not linear proportionate relationship in characteristic between heat energy that applies and colour developing density.
In addition, even also exist, therefore can have influence on the reliability of printing control having taken place all can not to detect the overheated problem of thermal head under the situation about damaging.For example, if with under the situation that the paper dielectric surface contacts do not add thermal control at thermal head, the temperature of the heating element heater of thermal head can rise to abnormal high level and therefore burn out heating element heater.
Summary of the invention
The objective of the invention is to solve the problems referred to above of conventional apparatus and method existence, proposed a kind of print control unit and method, can carry out high accuracy and stable printing control.
That is, according to the invention provides a kind of print control unit, it comprises:
Have the thermal head of a cover fine heating element and drive circuit, each described fine heating element not only can be used as heating member but also can be used as hygrosensor, and described drive circuit is used to provide electric current to drive described heating element heater;
Control circuit is used for the electric current that offers described each heating element heater is changed between heat driven state and temperature acquisition mode;
One circuit, the electric current that flows when utilizing the temperature detection state can be transformed into magnitude of voltage with the temperature value on described each heating element heater;
A/D conversion circuit is used for described voltage transitions to digital value;
Adder begins the digital value that accumulation calculating obtains by digital translation from heating;
Comparator, the accumulated value that described adder can be obtained compares with the predefined relative target print density value of being sent by last stage arrangement with the set point that prints, determines that thus that is bigger;
One circuit when aggregate-value reaches target print density value, can stop the heat driven of described heating element heater.
In addition, according to the present invention, for the colour developing medium being carried out suitable add thermal control to obtain having the print image of good image quality, to each heating element heater on thermal head, produce temperature measure, constantly carry out heat energy at interval with regular time and calculate, each colour developing point on the colour developing medium obtains desirable colour developing density.
Another aspect of the present invention relates to Method of printing, and it comprises step: the print control unit that comprises the thermal head that has a cover fine heating element and drive circuit is provided, and each described fine heating element not only can be used as heating element heater but also can be used as hygrosensor; Described drive circuit provides current drives described heating element heater; The electric current that offers described each heating element heater is changed between heat driven state and temperature acquisition mode, the mobile of electric current is transformed into magnitude of voltage with the temperature value on described each heating element heater during according to the temperature detection state, convert described magnitude of voltage to digital value, the additional calculation digital value obtains aggregate-value, described aggregate-value and target print density value compared determine that value is bigger, stop to provide electric current when having reached target print density value to described heating element heater.
Description of drawings.
Fig. 1 shows heat energy that is applied to common thermal recording material and the performance diagram that develops the color and concern between the density;
Fig. 2 explains in different initial temperatures to begin the heat colour developing that apply other chart of energy difference, wherein heating operation control continues to carry out the identical time;
Fig. 3 explains the temperature of heating element heater is repeatedly measured and accumulation calculating, thereby detects the chart of the method for the amount of thermal energy that applies;
Fig. 4 is the chart that saving of heat increases and print speed increases of explaining that the present invention realizes;
Fig. 5 is the line map that shows one embodiment of the invention;
Fig. 6 is the timing operation figure according to this embodiment.
Description of symbols:
100 fine heating elements
101 data registers
102 input terminals
109 phase inverters,
111 linear amplifier circuits
112 analog/digital converters
113 adders
117 comparators
120 driving transistors
The specific embodiment
Below, will be described in detail the present invention.The example that can use device of the present invention comprises fusing type thermal transfer printer and subliming type thermal transfer printer.Yet, except these devices, use the thermal printer of so-called thermal recording material also can use.
To the example of the thermal printer that uses thermal recording material be introduced.
Introducing the example that also will relate to the thermal head of use, comprise in the structure of this thermal head, for example, is the fine heating element of the array distribution of 200 or 300 word points with per inch density.
When being printed by this thermal head, when the word dot density was 200 words point/inch, thermal head moved transverse to medium with 1/200 inch character pitch, prints simultaneously.
Below, will print under the situation of operation a spacing at every turn, the heat control operation of a spacing is introduced.It is that the printing of a printing pitch is controlled that the present invention is different from the traditional print control program part that is called historical control method, the heat control that it does not need to relate to the spacing of having printed fully just utilizes the thermal head temperature decision that will at every turn measure when each spacing prints to print control.
That is, in the present invention, independently carry out for each spacing control, irrelevant with the history in past.
For the thermal recording material in the present embodiment, used the colour developing medium, as the heat sensitive color paper of so-called monochromatic electrothermal sensitive recording paper, two color thermal record-paper or the so-called TA medium producing by Fuji Photo Film Co., Ltd. and sell.
As for any the color development characteristic in these thermal recording materials, can be with reference to figure 1, wherein E is that heating element heater is applied to the heat energy on the thermal head, D is the colour developing density by the printing of E decision.These are announced at the performance diagram of the various types of electrothermal sensitive recording papers manufacturer by electrothermal sensitive recording paper.
Should remember the calorie value that on behalf of thermal head, the trunnion axis in the performance plot produce, provide heat energy value, not the representation temperature value to medium.Therefore, for the given little colour developing word point on Fig. 1 medium obtains desirable colour developing density " d1 ", control and make the heat energy that corresponding fine heating element produces on the thermal head equal " e1 ".But be to use the thermal head of deciding the resistance heating element heater that has that prior art partly mentions, the heat of generation is to estimate by the calculating of carrying out according to history of printing fully, and history of printing obtains according to the past print result.Therefore, when being printed the multipage medium continuously, thermal head has been accumulated heat, and temperature can rise.Therefore, along with the increase of number of print pages, the colour developing density on paper surface also increases unfriendly.The generation of this problem is owing to having used estimation to decide the current temperature of thermal head to cause error, and estimation produces thermal energy e1 as required and can obtain above-mentioned density d 1 and carry out.In other words, in traditional method, the temperature of heating element heater was not removed before heating element heater heating, thus when according to the definite heating element heater of estimation add heat the time, fail to reflect exactly under the situation of actual temperature in estimated temperature, just produced error.
In addition, as mentioning in the prior art, a kind of method has appearred in recent years, it has used the thermal head that has heating element heater, as the resistance value of the material of heating element heater according to the variations in temperature that produces, when printing, carry out temperature survey, therefore make and print the history that control need not rely on printing.
Thisly realize that by temperature survey the method for controlling is by producing heat when heating element heater, cause temperature to rise, record temperature t 1, the control of the density that develops the color thus can suppose t1 and print density d1 is proportional carries out.But this method has been brought error, because actual the printing is to carry out under the situation different with initial temperature along with continuous variation of time-temperature.
Explain that alternatively vertical axis representation temperature in Fig. 2 and trunnion axis is represented the time is heated that the back temperature increases and institute concern between time-consuming and checks that a kind of situation is to work as initial temperature " t to the fine heating element of thermal head
a" increase, arrive target control temperature " t
o" time, driving stopped in the time " Td ".Another kind of situation is temperature " t
b" increase, arrive target control temperature " t
o" time, driving stopped in the time " Td ".Both of these case is compared, and heating is at temperature " t
b" heat that produces is bigger under the situation of beginning, difference of its quantity and hachure part are proportional.Here it is produces reasons of error.
Here it is, corresponding to whole temperature change (t of each time variable TD
a-t
b) be error E.Change a mode and say that this error is shown E=K ó (t with energy meter
a-t
b) Td, wherein K is a proportionality constant, has comprised below with the specific heat capacity q that introduces.
Foregoing obtains confirming in reality is printed, therefore can determine to exist the difference of print density between two kinds of situation.
Operation
The inventor has carried out measurement as shown in Figure 3, wherein, at fine heating element medium is begun to heat the back and at interval the temperature of heating element heater is taken multiple measurements with regular time.Temperature value " tx " is the aggregate-value of each time measurement, and lasting heating reaches temperature to be set at " s0 " of desired value.Control then heat driven is stopped at the point that aggregate-value reaches s0.At that point, the density that can develop the color certainly is always identical, and is irrelevant with initial temperature.
Can be according to the whole heat energy s0 that follow temperature change to produce according to the following fact of calculating that is described, above-mentioned conclusion is self evident.
If the specific heat capacity of fine heating element is q, the temperature sometime is tx, and then the heat energy Ex that produces this moment can obtain Ex=q * tx according to following formula.
Therefore, be set at very short time T d when the cycle of measuring, then net quantity of heat value s0 is the aggregate-value of whole time, i.e. s0=ó Ex ' Td=q * ó tx ' Td
Wherein, Td is a constant, so s0=q ' Td * ó tx, when K=q ' Td, net quantity of heat value s0 finally becomes s0=K * ó tx.
According to this formula, very clear, the net quantity of heat value s0 that is applied on the medium is proportional with the temperature aggregate-value.Wherein temperature repeatedly measured at interval with regular time.
Therefore, can know that the temperature value that each time records adds together until s0=K * ó tx.Heating will last till that the multiplication of aggregate-value and proportionality constant k product equals target density value s0.
In other words, the following zone of temperature variation curve that this means Fig. 3 is proportional with print density.
Wherein, proportionality coefficient k is a constant, can determine according to the conversion range of the analog/digital converter in temperature measurement result voltage of signals amplification coefficient and the printing of introducing the below control circuit.
According to the present invention, can use above-mentioned formula to calculate the thermal energy that produces, energy as shown in Figure 1/colour developing density feature curve of making producer's announcement according to paper can carry out high-precision control to colour developing density.
Under the situation that traditional monochromatic heat is added lustre to, when carrying out the black and white printing, as shown in Figure 4, print white and need not heating, so do not apply heat energy, " A " is represented as point.On the other hand, black shows with maximum displaying color density, continue to be heated to Danone value e1, it gos deep into saturated colour developing density region S, represented as a B, point B be positioned at center S near, so can not take place and the departing from of saturated colour developing density region, even cause being used for showing in departure under the unnecessary or not enough situation of the quantity of heat energy of black.
In contrast to this, seldom such fluctuation in control according to the present invention, thus can stop heating at the energy value e2 place that is positioned at saturated colour developing density region S edge, such as with very high accuracy.As a result, energy difference, i.e. e1-e2, it is unnecessary to become.Therefore energy saving becomes possibility.Use under the situation of battery as battery at printer, it is favourable that the required gap length of battery altering becomes longer, when printing, can fulfil printing ahead of schedule, and the amount that shifts to an earlier date equals the oblique line part.Therefore, flying print becomes possibility.
Example
Below, embodiments of the invention are introduced in more detail.Fig. 5 has shown one embodiment of the present of invention.
At first, be provided with the heating element heater of lining up array on thermal head, heating element heater changes according to its resistance value of the temperature that adds thermosetting, and printing is to carry out when beginning to heat suddenly at each row.300 point/inches if if the word dot spacing of thermal head is said so, so for rescan or isochronous printing, line space is that 300 point/inches are normal equally.The thermal printing that carries out on the paper surface by thermal head repeats circularly with this spacing.
For the fine heating element among Fig. 5 100, use be the resistive element that is called electro-hot regulator, can be according to its resistance value of temperature change that produces.The metal component of electro-hot regulator should have between the change of the change of heating-up temperature and resistance value the composition of linear relationship to be selected.An operable component is the alloy of aluminium, chromium, boron and analogous components.To the operation of circuit be described below.Send data " 1 " from the last stage arrangement of data register 101 and write input terminal 102, wherein the point element of register correspondence in fine heating element according to timing signal 105.
After this, when signal " 0 " when last stage arrangement is input to input terminal 108,109 pairs of signals of converter are changed, this signal is taken as " 1 " and is input to and door 110.
With another input terminal of door 110, imported the output signal 106 of the conduct " 1 " of data register 101 above-mentioned, so but the logic product of generator gate 110, this driving transistors 120 enters the state of logical (opening).Notice that transistor 121 is in the state of pass, because control signal 108 is " 0 " during heat driven.Electric current flows to heating element heater 100 and transistor 120 as a result.As mentioned above, when heating element heater 100 is accepted electric current, begin to produce heat energy and its resistance value and change.According to embodiments of the invention, used the resistance that resistance value descends when temperature rises.The result is that the electric current of crossing transistor 120 when the temperature upwelling increases.
To discuss to the device that detects heating element heater 100 temperature propradations now.When the temperature rising, transistor 120 is logical, allows electric current to flow through.Yet in the timing of temperature detection, control signal 108 becomes " 1 ", so transistor 120 is transformed into the pass.Another transistor 121 converts to open from the pass.The result is, electric current flows to current sense resistor, and it is that to have the fixed resistance value be about 70 ohm fixed resistance 122 among this embodiment.
When heating element heater 100 produce heat with and temperature when rising, its resistance value descends and the current value rising.The result is that the electric current that flows to fixed resistance 122 increases, the voltage increase between resistance 122 terminals.The output voltage of resistance 122 amplifies by linear amplifier circuit 111, and amplifying signal is input to the analog/digital converter 112 of next stage then.The result is that the output valve of converter 112 converts digital value to, gives expression to the temperature value of the heating element heater 108 of thermal head with the numeral with eight-digit number.Detect then.
According to embodiments of the invention, the data of detection are with the gap periods of about 20 microseconds and be input to continuously cumulatively in the adder 113, therefore measure all to add up after the heating beginning at every turn.The result is by the numeral output of adder 113, can detect the heat energy value that produces in heating beginning back.Below, the heat energy value of generation will be reduced to the energy value " A " of detection.This " A " is proportional with the s0=K ó tx of operation part explanation in front.This detected value " A " is input to comparison circuit 117, so that compare.Notice that adder 113 is set signal 103 zero clearing before the printing control beginning of each row, each signal 108 is converted to " 1 " at the printing control period of each row from " 0 ", and the numeral output of analog/digital converter 112 is added to adder 113 by the signal 128 that is delayed circuit 127 slight delay.
Simultaneously, at this point, the designated value data that relate to controlled relatively fine heating element print density are delivered to input terminal 116 from last stage arrangement, and its form is that eight bit data can be expressed 256 levels.Concern between density that this data based Fig. 1 shows and the energy and calculate in advance that the density data value converts energy value to by the data conversion table 114 that produces.
The conversion table that is used for this purposes is a table of having set up corresponding relation between density value and the energy value, for example, and when digital value 128 this digital value behind the holding wire 116 of sending the indication level from last stage arrangement will convert energy value 2.56 to.
Be to consider as shown in Figure 1 the colour developing character of the paper that uses and the conversion table made in other words.Print density is the input data in this table, and the detected energy desired value is the output data.
In the printing, the conversion value 2.56 in this conversion table is stored in register 115 at the printing control period that little look produces part, is input to comparison circuit 117 as target energy controlling value " B " and compares with above-mentioned detected value " A ".
As long as detected value " A " less than desired value " B ", just continues heating, because control line 118 is " 0 ".Yet bit by bit, the energy value of accumulation increases, and detected value " A " becomes greater than desired value " B ".At these points, the control line 118 that is used for comparison circuit 117 outputs becomes " 1 " from " 0 ".The result is, logic add door 125 and 126 output become " 1 ".Therefore, register 101 resets, and the output of logic product 110 becomes " 0 ".Therefore, driving transistors 120 becomes the pass, and electric current stops to flow to the heating element heater 109 of electro-hot regulator, and heating stops.The energy that promptly applies has arrived predetermined density, stops so heating drives.This heating operation is carried out all fine heating elements of lining up array on thermal head.The control that these operations are carried out with independently and similarly mode above-mentioned is carried out.Yet, be used for having set very little desired value " B " with the heating element heater that hangs down the colour developing of colour developing density, therefore to compare the heating operation that is used for the dark element that develops the color naturally and finish earlier the heating operation of these elements.
Thereafter, even temperature detection signal 108 is imported from last stage arrangement, signal 106 will be " 0 ", because register 101 has resetted.Therefore logic product door 129 still is in " 0 ", and it causes transistor 121 also to become the pass, so electro-hot regulator 100 will no longer be driven the generation heat.
As a kind of prevent thermal head overheated and since when printing operating mistake cause the safeguard measure damaged; should carry out following operation: promptly when printing beginning; carry possible maximum temperature value to input terminal 200 from last stage arrangement; regularly 201 register 123 is set according to adjusting, utilizes comparator 124 and output to compare from analog/digital converter 112.Then, when the output valve of analog/digital converter 112 when being arranged on the value of register 123, through logic add door 125, the output as register 101 reset signals of 126 inputs becomes " 1 " from " 0 ", printing is as above introduced like that and is stopped, and this will prevent irregular overheated generation and the reliability of device is improved.
If the heating of all heating element heaters stops, the position of thermal head laterally the surface of paper move the distance of a spacing, the color operation that continues then starts at once, operating in of introducing above repeats on the medium to carry out continuously.Timing working table according to these explanations is drawn in Fig. 6.
Under the situation of using monochromatic electrothermal sensitive recording paper, for example, need on every page of medium, carry out aforesaid operations to a kind of color.Yet, under the situation of three look electrothermal sensitive recording papers, variant energy range is carried out altogether three times according to the thermal control that adds of three kinds of dissimilar color properties.
In each case, obtain being applied to the heat energy accumulated value of each row of surface repeatedly, detect surface temperature simultaneously, so on thermal recording material, can carry out very high-precision colour developing management.
For example, 256-gray scale polychrome density printed on the monochromatic electrothermal sensitive recording paper becomes possibility, and this is for adopting prior art to control to be very difficulty.Therefore, can flying print and the photographic image quality do not have the image of difference.Holographic film is printed becomes possibility, and this can only be undertaken and require heating in the high-temperature region with in very little temperature range by the printing technique that use is called the mould of brand traditionally.Use free printing model needn't use the Method of printing of fixed die to become a reality in addition.
Claims (6)
1. print control unit comprises:
Have the thermal head of a cover fine heating element and drive circuit, each described fine heating element not only can be used as heating member but also can be used as hygrosensor, and described drive circuit is used to provide electric current to drive described heating element heater;
Control circuit is used for the electric current that offers described each heating element heater is changed between heat driven state and temperature acquisition mode;
One circuit, the electric current that flows during according to the temperature detection state can convert the temperature value on described each heating element heater to magnitude of voltage;
A/D conversion circuit is used for described magnitude of voltage is transformed into digital value;
Adder begins the digital value that cumulative calculation obtains by digital translation from heating;
Comparator, the aggregate-value that described adder can be obtained compare with the predefined relative target print density value of being sent by last stage arrangement with the set point that prints determines which is bigger;
One circuit when aggregate-value reaches target print density value, stops the heat driven of described heating element heater.
2. print control unit according to claim 1 is characterized in that described print control unit also comprises a circuit, when finding that detected temperature value has surpassed predetermined value but during the aggregate-value of no show target still, can temporarily stop described heat driven.
3. print control unit according to claim 2 is characterized in that, described device comprises that also the development properties according to institute's working medium changes the device of described target aggregate-value.
4. method that adopts print control unit to print comprises step:
Be provided with the thermal head of a cover fine heating element, each described fine heating element not only can be used as heating member but also can be used as hygrosensor;
Provide current drives described heating element heater;
The electric current that offers described each heating element heater is changed between heat driven state and temperature acquisition mode;
The mobile of electric current is transformed into magnitude of voltage with the temperature value on described each heating element heater during according to the temperature detection state;
Convert described magnitude of voltage to digital value;
The described digital value of additional calculation obtains aggregate-value;
Described aggregate-value and target print density value compared determine which value is bigger;
When reaching target print density value, stop to provide electric current to described heating element heater.
5. method according to claim 4 is characterized in that described method also comprises step, has surpassed predetermined value when aggregate-value but than target aggregate-value hour, can temporarily stop the described heating element heater of current drives.
6. method according to claim 5 is characterized in that described method also comprises the step that changes described target aggregate-value according to the development properties of employed medium.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB021264309A CN1328061C (en) | 2002-07-11 | 2002-07-11 | Print control equipment and method for printing with the same equipment |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB021264309A CN1328061C (en) | 2002-07-11 | 2002-07-11 | Print control equipment and method for printing with the same equipment |
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| Publication Number | Publication Date |
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| CN1467090A CN1467090A (en) | 2004-01-14 |
| CN1328061C true CN1328061C (en) | 2007-07-25 |
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| CNB021264309A Expired - Fee Related CN1328061C (en) | 2002-07-11 | 2002-07-11 | Print control equipment and method for printing with the same equipment |
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| CN100584626C (en) * | 2006-12-26 | 2010-01-27 | 光宝科技股份有限公司 | Voltage regulation system and method capable of regulating driving voltage of thermal transfer printing head |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4567353A (en) * | 1977-04-07 | 1986-01-28 | Sharp Kabushiki Kaisha | High-accuracy temperature control |
| JPH06198943A (en) * | 1992-09-21 | 1994-07-19 | Nec Data Terminal Ltd | Thermal head |
| JP2001191577A (en) * | 2000-01-07 | 2001-07-17 | Seiko Instruments Inc | Thermal printer |
-
2002
- 2002-07-11 CN CNB021264309A patent/CN1328061C/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4567353A (en) * | 1977-04-07 | 1986-01-28 | Sharp Kabushiki Kaisha | High-accuracy temperature control |
| JPH06198943A (en) * | 1992-09-21 | 1994-07-19 | Nec Data Terminal Ltd | Thermal head |
| JP2001191577A (en) * | 2000-01-07 | 2001-07-17 | Seiko Instruments Inc | Thermal printer |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1467090A (en) | 2004-01-14 |
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