WO2011013295A1 - サーマルヘッドを制御するユニットを有する装置 - Google Patents
サーマルヘッドを制御するユニットを有する装置 Download PDFInfo
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- WO2011013295A1 WO2011013295A1 PCT/JP2010/004253 JP2010004253W WO2011013295A1 WO 2011013295 A1 WO2011013295 A1 WO 2011013295A1 JP 2010004253 W JP2010004253 W JP 2010004253W WO 2011013295 A1 WO2011013295 A1 WO 2011013295A1
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- strobe signal
- thermal head
- energization
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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
- B41J2/355—Control circuits for heating-element selection
- B41J2/36—Print density control
Definitions
- the present invention relates to an apparatus having a unit for controlling a thermal head.
- Japanese Patent Publication No. 2002-361921 discloses a sublimation type thermal head printer having a thermal head in which a plurality of heating resistors are arranged. This sublimation type thermal head printer is characterized in that the sublimation ribbon is preheated using energy higher than the energy applied during gradation expression until a predetermined temperature is reached.
- One embodiment of the present invention is an apparatus having a unit (control unit) for controlling a thermal head.
- the thermal head has n number of heating elements for generating dots arranged in a line.
- the controlling unit is a strobe signal for controlling the energization time of the heat generating element.
- a variable period strobe signal having a variable period is generated (m ⁇ 1) times to the thermal head.
- the cycle of the strobe signal can be varied according to the characteristics of the medium (for example, thermal paper or sublimation ink ribbon) used for printing (printing) with the thermal head. Therefore, the gradation expression (density change) can be made linear (linear) or nearly linear.
- the heating time for low gradation (low density) gradation expression is lengthened, and high gradation (high density) gradation.
- the heating time for expression can be shortened, and each dot can be output at a desired density from a low density to a high density.
- the period of the strobe signal is adjusted to the low density gradation expression, the heat generation of the heating element is saturated at the highest gradation part, or the period of the strobe signal is increased.
- the saturation in the high gradation part can be suppressed.
- This device further supplies a variable period (period variation type) latch signal that latches the next energization data in synchronization with the period variation type strobe signal.
- the period of the latch signal itself may be sequentially shortened, and the period for supplying the latch signal may be shortened in synchronization with the strobe signal.
- the waiting time of energization data for performing each gradation expression can be shortened.
- the time required for low density gradation expression and the time required for high density gradation expression are variable (variable). For this reason, even if the time required for low density gradation expression is lengthened, the time required for high density gradation expression can be shortened. Therefore, it is possible to reduce the time required for expressing gradations from low density to high density.
- an example of a periodic fluctuation type strobe signal is a strobe signal whose period is sequentially shortened. This is because a thermal type printing method using a sublimation ribbon or the like requires time for gradation expression (gradation printing) at a low density.
- the period variation type strobe signal is not limited to a signal whose period is sequentially shortened, but may be one whose period varies in units of a plurality of times.
- a signal having the same cycle may be output twice in succession, and then a signal having a shorter cycle may be continuously output a plurality of times.
- Another aspect of the present invention is an image generation apparatus, such as a printer, having the above-described apparatus and a thermal head.
- Yet another embodiment of the present invention is a method (control method) for controlling a thermal head having n dot generating heat generating elements arranged in a line.
- This method has the following steps.
- a strobe signal that controls the energization time of the heat generating element and is supplied to the thermal head (m-1) times as a variable period strobe signal having a variable period when generating an m-gradation image.
- Energization data for controlling the energization of each heating element by the strobe signal, and energization data including (m ⁇ 1) components for each heating element is applied to the thermal head in line units (m ⁇ 1). Supply in batches. -Synchronize with the period-variable strobe signal and supply a latch signal for latching the next energized data component to the thermal head in a variable period.
- Yet another embodiment of the present invention is to generate a multi-tone image using a thermal head having n heating elements for generating dots arranged in a line.
- This method has the following steps. -Controls the energization time of the heating element, and outputs the (i-1) -th strobe signal of the period-variable strobe signal that is output (m-1) times and has a variable period when generating an m-gradation image. Supply to the thermal head. Control the energization of each heating element by the strobe signal, and supply the i-th component of energization data including (m ⁇ 1) components to each heating element in units of lines. In synchronization with the end of the (i-1) -th strobe signal, a latch signal for latching the component of the i-th energization data is supplied to the thermal head in a variable cycle.
- the period of the strobe signal can be varied according to the characteristics of the media (for example, thermal paper or sublimation ink ribbon) used for printing (printing) with the thermal head. Can be.
- gradation expression density change
- the period of the latch signal the waiting time of the energization data can be shortened, and it is possible to suppress an increase in the printing time for each line.
- FIG. 2 is a diagram illustrating a schematic configuration of an example of a printer according to the invention.
- the block diagram which shows schematic structure of a thermal head and a control unit.
- FIG. 4A schematically shows waveforms of energization data, a strobe signal, and a latch signal of a printer that is an example of the present invention.
- FIG. 4B schematically shows the energization data and strobe signal waveforms of another printer.
- FIG. 5A is a diagram showing the color development characteristics of media, and is a diagram showing the relationship between the amount of heat and gradation.
- FIG. 5B is a diagram showing the relationship between the amount of heat and the number of energizations in a printer which is an example of the present invention.
- FIG. 5C is a diagram showing a lookup table included in a strobe signal generation circuit included in a printer which is an example of the present invention.
- FIG. 5D is a diagram showing the relationship between the number of energizations and gradation in a printer which is an example of the present invention.
- FIG. 6A is a diagram showing the color development characteristics of media, and is a diagram showing the relationship between the amount of heat and gradation.
- FIG. 6B is a diagram showing the relationship between the amount of heat and the number of energizations in a conventional printer.
- FIG. 6C is a diagram showing the relationship between the number of energizations and gradation in a conventional printer.
- FIG. 1 shows a schematic configuration of an example (printer) of an image generation apparatus according to the present invention.
- This image generation apparatus (printer) 1 is a sublimation type thermal printer, and is a line-type thermal head having n dot generation heating elements (heating elements, dot generation elements) 11 arranged in a line.
- a thermal print head) 10 a platen roller 32 for feeding a recording medium (paper) 31, a multi-sublimation ribbon 35 for multi-color printing on the paper 31, a motor 33 for driving the platen roller 32, and controlling these.
- Control unit (control unit, control device) 20 controls the platen roller 32.
- the control unit 20 acquires data for printing an image including various contents such as pictures and characters from a host device 90 such as a personal computer, and uses the thermal head 10 based on the data to record a recording medium (paper). ) 31 is printed.
- a sublimation type (thermal transfer, sublimation transfer) printer (image generation apparatus) 1 an ink ribbon (sublimation ribbon) 35 is heated as a medium by the heat energy of the heating element 11, and a recording medium 31 is discharged by ink discharged from the ribbon 35. Dots are formed (generated).
- Another example of the media heated by the thermal head 10 is thermal paper. If the medium is thermal paper, dots for forming an image on the surface of the thermal paper are formed (generated) by the thermal energy supplied from the heating elements 11 arranged in a line. That is, in this case, the thermal paper serves as both a medium and a recording medium.
- the control unit 20 has a plurality of functional units 21, 22, and 23.
- the first functional unit 21 generates (m ⁇ 1) energization data ⁇ 1 for expressing m gradations for the n heating elements (dot generation elements) 11, and supplies the thermal head 10 with line units.
- a unit (energization data generation unit, energization data generation circuit) including a function of (m-1) times serial transfer.
- the second functional unit 22 includes a function (strobe) that controls the energization time of the heating element 11 in units of lines and supplies a strobe signal ⁇ 2 for performing gradation representation in dot units in cooperation with the energization data ⁇ 1.
- Signal generation unit, strobe signal generation circuit ).
- the strobe signal generation unit 22 is a strobe signal ⁇ 2 for controlling the energization time of the heat generating element 11, and generates a periodic fluctuation type strobe signal ⁇ 2 having a variable cycle when generating an m-gradation image (m ⁇ 1) Supply to the thermal head 10 once.
- the energization data generating unit 21 is energization data ⁇ 1 for controlling energization of each of the heating elements 11 by the strobe signal ⁇ 2, and the energization data ⁇ 1 including (m ⁇ 1) components for each of the heating elements 11.
- the ink is supplied to the thermal head 10 in units of (m-1) times.
- the third functional unit 23 includes a function of supplying a latch signal ⁇ 3 for latching the energization data ⁇ 1 to the thermal head 10 in a variable cycle in synchronism with the periodically varying strobe signal ⁇ 2 (latch signal generation).
- Unit latch signal generation circuit
- the latch signal generation unit 23 supplies the thermal head 10 with a variable period latch signal ⁇ 3 that latches the next component of the energization data ⁇ 1 in synchronization with the period variation type strobe signal ⁇ 2.
- FIG. 2 is a block diagram showing a schematic configuration of the thermal head 10 and the control unit 20.
- the thermal head 10 is a line thermal head, and can form a plurality of dots arranged in the width direction (sub-scan direction) of the paper 31 in line units (scan units). Although the thermal head 10 may simultaneously form dots included in a plurality of lines, an example of printing (forming dots) for each line will be described below. Therefore, the thermal head 10 has a plurality (n pieces) of heating elements 11 arranged in a line. Each heating element 11 is supplied with electric power from a power source 19.
- the thermal head 10 includes a unit 15 that receives data including a plurality of binary components for controlling on / off of the heating elements 11.
- the receiving unit 15 includes a plurality (n) of shift registers (data holding elements) 12, a plurality (n) of latch circuits 13, and a plurality (n) of gate circuits 14.
- Each of the shift registers (data holding elements) 12 is a circuit that receives the on / off data component supplied to the heating element 11 and that is a component included in the energization data ⁇ 1 and performs serial-parallel conversion.
- the latch circuit 13 is a circuit that latches the components of the energization data ⁇ 1 converted in parallel by the shift register 12 in correspondence with the respective heating elements 11 by the latch signal ⁇ 3.
- the gate circuit 14 is a circuit that controls energization of each heating element 11 by each component of the energization data ⁇ 1 latched in each latch circuit 13 and a strobe signal ⁇ 2 supplied in units of lines.
- the gate circuit 14 supplies power to each heating element 11 to cause each heating element 11 to generate heat.
- the control unit 20 includes an energization data generation unit (energization data generation circuit) 21, a strobe signal generation unit (strobe signal generation circuit) 22, and a CPU 25 including a function as a latch signal generation unit 23 that outputs a latch signal ⁇ 3.
- the CPU 25 includes a function as the latch signal generation unit 23, and further includes a print control unit (print control function) 24.
- the print control function 24 sets the print data ⁇ 5 received from the host 90 in the energization data generation circuit 21 for each line, and outputs a reset signal ⁇ 6 for starting printing of one line.
- the print control unit 24 outputs a control signal (strobe control signal) ⁇ 7 for outputting the next strobe signal.
- the print data ⁇ 5 for each line for printing in this example is 4 bits ⁇ n (0 to n ⁇ 1) pieces of data realizing 16 gradations of 0 to 15. “N” represents a certain integer.
- Energization data generation circuit 21 outputs energization data ⁇ 1.
- the energization data generation circuit 21 has a holding register 41 for holding data including 4 bits ⁇ n (0 to n ⁇ 1) components, which is the original image data, and a predetermined dot in the line from the holding register 41.
- It includes a counter 44 and a comparator 45 for generating (0th to 14th) data in order.
- the comparator 45 compares the output (0 to 14) of the counter 44 with the 4-bit data (0 to 15) of each dot selected by the selector 42 from the holding register 41 and outputs 2 for gradation expression.
- Energization data ⁇ 1 including a plurality of components of values is generated.
- the print control function 24 of the CPU 25 sets the print data ⁇ 5 received from the host 90 in the holding register 41 of the energization data generation circuit 21 in units of lines. Thereafter, when the CPU 25 outputs the reset signal ⁇ 6, the counter 44 of the energization data generation circuit 21 is reset, and the first energization data ⁇ 1 ( ⁇ 1.1) is output.
- the energization data is generally indicated as energization data ⁇ 1
- the energization data ⁇ 1 is indicated as energization data ⁇ 1.1 when the energization data ⁇ 1 is divided into a plurality of times and sequentially output in line units. To do. The same applies to other data.
- the energization data ⁇ 1 is data including a plurality of on / off binary components, and is output (m ⁇ 1) times, that is, divided into 15 times.
- the dots that are turned on by the first energization data ⁇ 1.1 are dots in which the 4-bit data in the holding register 41 is 1 to 15, that is, 1 to 15 gradations out of 0 to 15 gradations.
- the 4-bit data component of the holding register 41 is 0, that is, white (off) dots are turned off in the first energization data ⁇ 1.1.
- the 4-bit data component of the holding register 41 is “1”, that is, the low-density dot with the lowest gray scale is turned off in the second energization data ⁇ 1.2.
- the 4-bit data component of the holding register 41 is “15”, that is, the high-density dot with the highest gray scale is turned on at the 15th energization data ⁇ 1.15, and the other grayscale dots are the 15th. It turns off in the energization data ⁇ 1.15.
- the strobe signal generation circuit 22 outputs a 15 times (1 to 15) periodically varying strobe signal ⁇ 2.
- the strobe signal ⁇ 2 is a signal common to one line, that is, n heating elements 11.
- the strobe signal generation circuit 22 includes a strobe time counter 51 that counts the output (continuation) time of the strobe signal ⁇ 2, a strobe number counter 52 that counts the number of energizations to determine the number of the strobe signal ⁇ 2, and the number of energizations
- the strobe signal ⁇ 2 is increased (off) by comparing the reference circuit 53 that outputs the estimated duration time of the strobe signal ⁇ 2 corresponding to the above and the estimated duration time output from the reference circuit 53 with the duration time measured by the counter 51. And a comparator 54.
- the reference circuit 53 includes a lookup table (LUT, see FIG. 5C) 53a that stores the relationship between the number of energizations and the amount of heat (strobe width).
- an energization frequency 53b and an energization time (strobe width) 53c are set in consideration of the coloring characteristics of the medium (ribbon) 35 to be heated.
- the coloring property of the sublimation ribbon 35 is nonlinear with respect to the amount of heat applied, and a large amount of heat is required to obtain a predetermined concentration at a low concentration, that is, at the beginning of heating. Is done.
- the amount of heat generated by the heating element 11 increases almost linearly with respect to the heating time (energization time).
- the LUT 53a is set with a condition that the energization time 53c is low when the concentration is low (the number of energizations is small) and the energization time 53c is short when the concentration is high (the number of energizations is large).
- the periodically varying strobe signal ⁇ 2 output from the strobe signal generation circuit 22 of this example is a strobe signal whose cycle is sequentially shortened.
- the latch signal generation unit 23 realized by the CPU 25 outputs the latch signal ⁇ 3 in synchronization with the period variation type strobe signal ⁇ 2 output from the strobe signal generation circuit 22. Specifically, the latch signal generation unit 23 outputs the first latch signal ⁇ 3 for latching the first energization data ⁇ 1.1 for gradation control following the reset signal ⁇ 6. In response to the reset signal ⁇ 6 and the first strobe control signal ⁇ 7 output from the print control unit 24, the first strobe signal ⁇ 2.1 is output from the strobe signal generation circuit 22. In response to the first strobe control signal ⁇ 7, the energization data generation circuit 21 generates and outputs the next energization data ⁇ 1.2.
- the latch signal generation unit 23 outputs the latch signal ⁇ 3 again when the period-variable strobe signal ⁇ 2.1 is up (turned off) and the energization time of the heating element 11 is completed. Accordingly, the latch signal ⁇ 3 is output from the latch signal generation unit 23 of the CPU 25 in a variable cycle, supplied to the thermal head 10, and the next energization data ⁇ 1.2 is latched. Subsequent to the latch signal ⁇ 3, the next strobe control signal ⁇ 7 is output, and the next strobe signal ⁇ 2.2 is output from the strobe signal generation circuit 22. At the same time, the energization data generation circuit 21 generates and outputs the next energization data ⁇ 1.3.
- FIG. 3 is a flowchart for explaining an example of the control method of the present invention.
- FIG. 4A shows energization data generated and output in the image generating apparatus (printer) 1 and output in a plurality of times, and energization data ⁇ 1.1 to 1.15, and a periodically varying strobe signal. The waveforms of ⁇ 2.1 to 2.15 and the latch signal ⁇ 3 are schematically shown.
- FIG. 4B schematically shows energization data and a strobe signal waveform of a printer using a fixed period strobe signal as information for comparison. In the printer 1, for example, dots included in the line are formed in units of lines as follows.
- the 0th density that is, white or off dots, is expressed by the fact that no component is included in the energization data ⁇ 1.
- the energization data generation circuit 21 outputs energization data ⁇ 1.1 for the first gradation (first gradation) supplied first.
- the latch signal generation unit 23 outputs a signal ⁇ 3 for latching the energization data ⁇ 1.1 of the first gradation.
- the strobe signal generation circuit 22 outputs the strobe signal ⁇ 2.1 for the first gradation.
- step 104 “i” is set to “2”.
- step 105 the energization data generation circuit 21 outputs energization data ⁇ 1.2 for the second gradation. This process starts with a strobe control signal ⁇ 7 for outputting the first strobe signal ⁇ 2.1.
- step 106 the latch signal generation unit 23 waits for the end of the first strobe signal, and in step 107, outputs a signal ⁇ 3 for latching the second gradation (next) energization data ⁇ 1.2 at time t1. .
- the strobe control signal ⁇ 7 is output, and in step 108, the strobe signal generation circuit 22 outputs the strobe signal ⁇ 2.2 of the second gradation.
- Steps 109 and 110 the condition of the parameter “i” is determined, and the processing from Step 105 to Step 108 is repeated (m ⁇ 1, “15” in this example).
- the energization data generation circuit 21 determines that the energization data ⁇ 1. i is output, and in step 106, the latch signal generation circuit 23 waits for the end of the (i ⁇ 1) -th strobe signal, and in step 107, the energization data ⁇ 1.
- a signal ⁇ 3 for latching i is output.
- the strobe control signal ⁇ 7 is output.
- the strobe signal generation circuit 22 outputs the strobe signal ⁇ 2. i is output.
- the printer 1 applies the energization data ⁇ 1 and the strobe signal ⁇ 2 to the dots of the 1st to 15th gradations (gray scales 1 to 15) according to the printing data ⁇ 5 stored in the holding register 41.
- drawing is performed so as to become darker in sequence.
- the printer 1 of this example has a low gradation portion (low density, strobe signal ⁇ 2.1) on-time (because it is configured with negative logic, the time when the strobe signal ⁇ 2.1 is low) T1.
- the gradation expression (gradation printing) is performed by using the periodic fluctuation type strobe signal ⁇ 2 longer than the ON time T15 of the high gradation portion (high density, strobe signal ⁇ 2.15).
- this printer 1 heats the sublimation ribbon 35 by causing the heating element 11 to generate heat using the strobe signal ⁇ 2 whose cycle is shortened in order from the low density expressed first to the high density expressed last. And gradation expression (gradation printing). Further, the printer 1 latches the next energization data ⁇ 1 using the variable cycle latch signal ⁇ 3 in synchronization with the strobe signal ⁇ 2 of each cycle (representation of each gradation) being up (finished).
- the period of the strobe signal ⁇ 2 is long when the low density portion in the initial stage in which the gradation expression is performed, and the printer 1 of this example has a low density.
- This process takes more time than conventional printers using a fixed period strobe signal.
- the periods of the strobe signal ⁇ 2 and the latch signal ⁇ 3 are variable, and the time is shortened as the processing becomes higher in sequence. For this reason, in the printer 1 of this example, the processing time for high density is shortened compared to the conventional printer.
- the total time for forming one dot of multi-gradation is shorter in the printing time (time t0 to time t16) of the printer 1 of this example than the printing time (time t100 to time t116) of the conventional printer.
- the time required for printing one line can be shortened.
- the printer 1 of this example can improve the resolution of the low density by spending time on the low density processing. Further, the printer 1 of this example can suppress the saturation of the density at high density and the inability to express gradation by shortening the processing time for high density.
- FIG. 5 shows data relating to characteristics of the printer (image generating apparatus) 1 which is an example of the present invention.
- FIG. 5A is a diagram illustrating the color development characteristics of the medium (sublimation ribbon) 35, and is a diagram illustrating the relationship between the amount of heat and the gradation.
- FIG. 5B is a diagram illustrating the relationship between the amount of heat and the number of energizations in the printer 1.
- FIG. 5C is a diagram illustrating the contents of the lookup table 53a included in the strobe signal generation circuit 22 included in the printer 1.
- FIG. 5D is a diagram illustrating the relationship between the number of energizations and the gradation in the printer 1.
- the printer 1 has a period variation type (variable period type) strobe signal ⁇ 2 having a different period (on time) for each number of energizations for expressing gradation.
- a period variation type (variable period type) strobe signal ⁇ 2 having a different period (on time) for each number of energizations for expressing gradation.
- control can be performed so that the relationship between the number of energizations and the amount of heat becomes nonlinear. Therefore, as shown in FIG. 5A, the density (gradation) is nonlinear with respect to the amount of heat, and the density (gradation) is linear with respect to the number of energizations as shown in FIG. 5D. In this way, a grayscale image with gradation expression can be printed according to the print data ⁇ 5.
- FIG. 6 is a diagram summarizing data relating to a conventional apparatus that prints using a strobe signal having a constant period.
- FIG. 6A is a diagram illustrating the color development characteristics of the medium (sublimation ribbon) 35, and is a diagram illustrating the relationship between the amount of heat and the gradation.
- FIG. 6B is a diagram showing the relationship between the amount of heat and the number of energizations in a conventional printer.
- FIG. 6C is a diagram showing the relationship between the number of energizations and gradation in a conventional printer.
- a strobe signal having a constant period is used, and the number of energizations and the amount of heat are in a proportional relationship. Therefore, if the medium 35 has a non-linear density (gradation) with respect to the amount of heat, as shown in FIG. 6C, the relationship between the number of energizations and the gradation becomes nonlinear, and the amount of heat is insufficient in the low gradation part. As a result, the change in density is small and the high gradation part is saturated, so that the change is substantially eliminated.
- the cycle of the strobe signal ⁇ 2 can be changed so as to correspond to the nonlinear characteristic of the medium 35 to be used. For this reason, since the medium 35 can be heated sufficiently in the low gradation part, the resolution (gray scale) of the dots in the low gradation part can be expressed more faithfully. In addition, since saturation of the color of the medium 35 in the high gradation part can be suppressed, the resolution (gray scale) of the dots in the high gradation part can be expressed more faithfully.
- the gray scale can be expressed more faithfully to the print data ⁇ 5 over all gradations.
- the cycle of the latch signal ⁇ 3 is varied in synchronization with the strobe signal ⁇ 2. For this reason, even if the strobe signal ⁇ 2 having a long on-time (long cycle) is used to faithfully represent the low gradation part, the time for forming one dot (one line) becomes long as a whole. Can be suppressed. On the contrary, the time for forming one dot (one line) can be shortened by setting the strobe signal ⁇ 2 for expressing the high gradation portion to a short period. Furthermore, the strobe signal ⁇ 2 for expressing the high gradation part can be expressed faithfully by setting the strobe signal ⁇ 2 to a short period.
- a sublimation type line thermal printer using a sublimation ribbon is described.
- a line for printing on a medium having a predetermined color development characteristic with respect to the amount of heat can also be applied to a thermal printer.
- the present invention can be applied not only to the line thermal printer but also to a serial type printer in which the head reciprocates in the scanning direction.
- the printer is not limited to a personal printer, and may be a multifunction machine or a business printing machine.
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Abstract
Description
・発熱素子の通電時間を制御するストローブ信号であって、m階調の画像を生成する際に周期が可変の周期変動型のストローブ信号を、(m-1)回、サーマルヘッドに供給すること。
・ストローブ信号による発熱素子のそれぞれの通電を制御する通電データであって、発熱素子のそれぞれに対して(m-1)個の成分を含む通電データをサーマルヘッドにライン単位で(m-1)回に分けて供給すること。
・周期変動型のストローブ信号に同期して、次回の通電データの成分をラッチするラッチ信号を可変周期でサーマルヘッドに供給すること。
・発熱素子の通電時間を制御し、m階調の画像を生成する際に(m-1)回出力され、周期が可変の周期変動型のストローブ信号の(i-1)番目のストローブ信号をサーマルヘッドに供給すること。
・ストローブ信号による発熱素子のそれぞれの通電を制御し、発熱素子のそれぞれに対して(m-1)個の成分を含む通電データのi番目の成分をサーマルヘッドにライン単位で供給すること。
・(i-1)番目のストローブ信号の終了に同期して、i番目の通電データの成分をラッチするラッチ信号を可変周期でサーマルヘッドに供給すること。
Claims (6)
- ライン状に配置されたn個のドット生成用の発熱素子を含むサーマルヘッドを制御するユニットを有する装置であって、
前記制御するユニットは、
前記発熱素子の通電時間を制御するストローブ信号であって、m階調の画像を生成する際に周期が可変の周期変動型のストローブ信号を(m-1)回、前記サーマルヘッドに供給するユニットと、
前記ストローブ信号による前記発熱素子のそれぞれの通電を制御する通電データであって、前記発熱素子のそれぞれに対して(m-1)個の成分を含む通電データを前記サーマルヘッドにライン単位で(m-1)回に分けて供給するユニットと、
前記周期変動型のストローブ信号に同期して、次回の前記通電データの成分をラッチする可変周期のラッチ信号を前記サーマルヘッドに供給するユニットとを有する、装置。 - 請求項1において、前記周期変動型のストローブ信号は、周期が順次短くなるストローブ信号である、装置。
- 請求項1または2に記載の装置と、
前記サーマルヘッドとを有する、画像生成装置。 - ライン状に配置されたn個のドット生成用の発熱素子を含むサーマルヘッドを制御する方法であって、
前記発熱素子の通電時間を制御するストローブ信号であって、m階調の画像を生成する際に周期が可変の周期変動型のストローブ信号を、(m-1)回、前記サーマルヘッドに供給することと、
前記ストローブ信号による前記発熱素子のそれぞれの通電を制御する通電データであって、前記発熱素子のそれぞれに対して(m-1)個の成分を含む通電データを前記サーマルヘッドにライン単位で(m-1)回に分けて供給することと、
前記周期変動型のストローブ信号に同期して、次回の前記通電データの成分をラッチするラッチ信号を可変周期で前記サーマルヘッドに供給することとを有する、方法。 - 請求項4において、前記周期変動型のストローブ信号は、周期が順次短くなるストローブ信号である、方法。
- ライン状に配置されたn個のドット生成用の発熱素子を有するサーマルヘッドを用いて多階調の画像を生成する方法であって、
前記発熱素子の通電時間を制御し、m階調の画像を生成する際に(m-1)回出力され、周期が可変の周期変動型のストローブ信号の(i-1)番目のストローブ信号を前記サーマルヘッドに供給することと、
前記ストローブ信号による前記発熱素子のそれぞれの通電を制御し、前記発熱素子のそれぞれに対して(m-1)個の成分を含む通電データのi番目の成分を前記サーマルヘッドにライン単位で供給することと、
前記(i-1)番目のストローブ信号の終了に同期して、前記i番目の前記通電データの成分をラッチするラッチ信号を可変周期で前記サーマルヘッドに供給することとを有する、方法。
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JP2011524627A JP5574347B2 (ja) | 2009-07-27 | 2010-06-28 | サーマルヘッドを制御するユニットを有する装置 |
US13/387,456 US20120176458A1 (en) | 2009-07-27 | 2010-06-28 | Apparatus including unit controlling a thermal head |
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Citations (3)
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JPH0226758A (ja) * | 1988-07-18 | 1990-01-29 | Canon Inc | サーマル記録装置 |
JPH09323439A (ja) * | 1996-06-06 | 1997-12-16 | Toshiba Corp | プリヒート機能付き昇華型印刷装置 |
JP2008018621A (ja) * | 2006-07-13 | 2008-01-31 | Toshiba Tec Corp | サーマルプリンタ、サーマルプリンタの制御方法 |
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JPS62234954A (ja) * | 1986-04-04 | 1987-10-15 | Ricoh Co Ltd | サ−マルヘツド駆動方式 |
JP2611197B2 (ja) * | 1986-05-01 | 1997-05-21 | ソニー株式会社 | 感熱ヘツドの駆動制御回路 |
JP2503589B2 (ja) * | 1988-05-24 | 1996-06-05 | 富士ゼロックス株式会社 | 画像記録装置 |
JPH02175264A (ja) * | 1988-12-28 | 1990-07-06 | Chinon Ind Inc | 記録装置 |
US5625399A (en) * | 1992-01-31 | 1997-04-29 | Intermec Corporation | Method and apparatus for controlling a thermal printhead |
JPH1016413A (ja) * | 1996-06-28 | 1998-01-20 | Dainippon Printing Co Ltd | 熱転写記録方法 |
US7319473B2 (en) * | 2005-12-22 | 2008-01-15 | Carestream Health, Inc. | Thermal recording system and method |
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- 2010-06-28 US US13/387,456 patent/US20120176458A1/en not_active Abandoned
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Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0226758A (ja) * | 1988-07-18 | 1990-01-29 | Canon Inc | サーマル記録装置 |
JPH09323439A (ja) * | 1996-06-06 | 1997-12-16 | Toshiba Corp | プリヒート機能付き昇華型印刷装置 |
JP2008018621A (ja) * | 2006-07-13 | 2008-01-31 | Toshiba Tec Corp | サーマルプリンタ、サーマルプリンタの制御方法 |
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