JP4366066B2 - Recording apparatus control method and recording apparatus - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to control of a recording position, and more particularly to generation of a timing signal that defines a driving timing of a recording element when recording is performed by scanning a carriage mounted with a recording head having a recording element on a recording medium. is there.
[0002]
[Prior art]
For example, as an information output device in a word processor, personal computer, facsimile, etc., in a recording device that records information such as desired characters and images on a sheet-like recording medium such as paper or film, the recording medium such as paper is fed. A serial recording system that performs recording by scanning a carriage mounted with a recording head having a recording element in a direction crossing the direction is generally widely used from the viewpoints of low cost and easy miniaturization.
[0003]
Various methods are known as recording methods of the recording apparatus. However, the inkjet method is used because of non-contact recording on a recording medium such as paper, easy colorization, and high quietness. In recent years, it has attracted particular attention.
[0004]
In such a recording apparatus, it is essential to match the scanning position of the recording head with the driving timing of the recording head. As a means for detecting the scanning position of the recording head, an encoder for detecting the moving position of the carriage on which the recording head is mounted is used.
[0005]
When an encoder is used, the resolution of carriage position detection by the encoder greatly affects the image recording resolution. Improving the image recording resolution (resolution) is an important issue, and in order to increase the image recording resolution in a recording apparatus using such an encoder, it is common to increase the resolution of the encoder. It is. However, at present, there is a demand for price reduction for an ink jet recording apparatus, and the use of a high-resolution, high-price encoder is a negative factor in terms of cost in commercializing the recording apparatus.
[0006]
In such a situation, in order to suppress an increase in the cost of the entire apparatus while achieving high resolution of the recorded image, a timing signal (kick pulse) with higher resolution is used based on the pulse-like encode signal output from the encoder. ) To drive the recording head based on this signal.
[0007]
As a method for generating a high-resolution signal, there is a method in which one period from the rising edge of the encoded signal output from the encoder to the next rising edge (or from the falling edge to the next falling edge) is divided into n equal parts. It is used. For example, if the measured value of the immediately preceding edge period is m and the number (number of divisions) of kick pulses generated within a preset edge period is n, the kick pulse interval is a quotient value of m / n, and n After the kick pulse is generated, it waits until the next edge period.
[0008]
FIG. 2 is a block diagram showing a configuration of a conventional kick pulse control circuit. Reference numeral 1 denotes an edge detector, which generates a start pulse when the edge interval of the encode signal is detected. Reference numeral 2 denotes a counter for measuring an edge interval (period). Reference numeral 3 denotes a shifter, which executes an operation corresponding to division when n is a power of 2. Reference numeral 4 denotes a register that holds edge intervals. A selector 5 selects a shifter value or a register value. Reference numeral 6 denotes a load counter for loading data by a load signal. Reference numeral 7 denotes a 1 detector, which outputs “H” when the value of the load counter is 1. A pulse controller 8 controls the number of kick pulses.
[0009]
In this circuit, when an edge of the encode signal is detected, a start pulse is generated by the edge detector 1. A value obtained by subtracting the margin value from one cycle of the edge measured by the counter 2 by the start pulse and dividing the number by the number of kick pulses generated between the slits is held in the register 4. The selector 5 outputs the output of the shifter 3 or the value of the register 4 according to a control signal generated from the pulse controller 8.
[0010]
The counter 6 loads data from the selector with a load signal output from the pulse controller 8 and decrements each time a clock is input until the loaded data becomes 1. This time becomes the kick pulse interval. When the value of the counter 6 is 1, the 1 detector 7 outputs an ON portion for one clock of the kick pulse. The pulse controller 8 outputs a load signal to the counter 6 when a pulse is generated. The number of pulses output at that time is counted, and a load signal is output to the counter 6 until the count value reaches the number of kick pulses generated between the slits.
[0011]
FIG. 1 is a timing chart showing the relationship between the two-phase encode signals S1 and S2 output from the encoder and the kick pulse P1 generated by the kick pulse control circuit as shown in FIG. In this example, a kick pulse corresponding to a recording resolution of 1200 dpi corresponding to 8 times is generated from an encoded signal of an encoder having a resolution of 150 dpi. The numbers in the figure indicate the clock count numbers.
[0012]
For example, when the interval of one period measured at the rising edge of the encoder signal S1 changes from 79 of the interval A from the time t0 to t1 to 84 of the interval B from the time t1 to t2, the kick pulse interval in the interval B (Cycle) is based on the previous interval A,
79/8 = 9 ... 7 more
Therefore, the kick pulse interval is 9. In this case, until the next kick pulse is output after the eighth kick pulse is output,
84-9 × 8 = 12 (clock)
The interval of will be free.
[0013]
As described above, when the recording operation is performed while the carriage is decelerating, a portion having a gap is generated.
[0014]
On the other hand, when the interval of one cycle measured at the rising edge of the encoder signal S1 changes from 84 in the interval B from time t1 to t2 to 76 in the interval C from time t2 to t3, the kick pulse interval in the interval C Is based on the previous interval B,
84/8 = 10 ... remainder 4
Thus, the kick pulse interval is 10. In this case, the eight kick pulses do not fit in the interval C. In the next interval D, the generation of the kick pulse is performed after the eighth kick pulse generated in the interval C is output, or before the kick pulse generated for the interval C is output, A kick pulse for the next interval D is output.
[0015]
As described above, when the recording operation is performed while the carriage is accelerating, there is a possibility that the recording cannot be performed at the target position.
[0016]
[Problems to be solved by the invention]
As shown in FIG. 1, the encoder outputs two signals, phase A (S1) and phase B (S2), but the phase B signal is essentially 90 ° out of phase with the phase A signal. Is. Therefore, if the edge interval between the A and B phases and the rise-fall interval are accurate, an accurate quadruple signal can be generated based on these two signals.
[0017]
However, in reality, errors occur in the duty ratio in the same phase and the spacing accuracy between the A and B phases due to the accuracy of encoder installation, the characteristics of the photodiode, the accuracy of the slits provided in the film, and so on. In addition, it is difficult to perform high resolution recording using a quadruple signal.
[0018]
For this reason, conventionally, as shown in FIG. 1, the kick pulse interval is calculated using the reliable edge interval of either the A phase or the B phase. During the measurement of one edge period from the encoded signal, it is considered that the carriage speed fluctuates in a short time shorter than the one edge period due to mechanical factors. However, in the conventional method, since one edge period is measured based on only one encoded signal, the time required for the period measurement becomes long, and the response to a change in the carriage speed is delayed.
[0019]
As described above, in the conventional method, the response of the kick pulse to the carriage speed fluctuation becomes slow, so that it is difficult to perform high-quality recording particularly during the acceleration / deceleration operation of the carriage.
[0020]
The present invention has been made in view of the above situation, and an object of the present invention is to update the period of the timing signal with high responsiveness to the speed variation of the carriage.
[0021]
[Means for Solving the Problems]
A control method of a recording apparatus according to an embodiment of the present invention that achieves the above object is based on a timing signal that defines a driving timing of the recording element by scanning a carriage mounted with a recording head having a recording element on the recording medium. And a recording apparatus control method for recording,
A measuring step of rising and falling edges the edge of each interval falling the rising edge and the falling of the pulse signal output from the encoder is measured every sensed according to the position in the scanning direction of the carriage,
Each time the edge interval for one cycle is measured in the measuring step, the period of the timing signal is obtained by dividing the result of the addition processing of the measured edge interval and the remainder generated by the division processing by a predetermined number. And a calculation step of outputting the timing signal based on the calculation result;
Including
The calculation step includes
When the edge interval for one period is measured, the measured edge interval is added to the remainder generated by the division processing at the previous cycle calculation of the timing signal, and the addition result is divided by the predetermined number. And a second operation for adding the measured edge interval and the remainder generated by the division processing at the time of the previous cycle calculation of the timing signal, and dividing the addition result by the predetermined number; An arithmetic processing step for performing
A selection step of selecting one of the first quotient obtained by the division process at the time of the first calculation and the second quotient obtained by the division process at the time of the second calculation and holding the selected quotient in the holding unit; ,
After the first and second calculations are performed in the calculation processing step, the second quotient obtained in the calculation processing step at the edge interval of the next cycle is held in the holding means. An update step of updating the value held in the holding means with the second quotient obtained at the edge interval of the next period,
An output step of outputting the timing signal at intervals based on the value held in the holding means;
It is characterized by including.
[0022]
That is, according to the present invention, when generating a timing signal that defines a timing signal that defines a drive timing of a recording element when performing recording by scanning a carriage mounted with a recording head having a recording element on the recording medium. Measuring the interval between the rising and falling edges of the pulse signal output from the encoder according to the position of the carriage in the scanning direction, and dividing the interval between the edges by a predetermined number to calculate the period of the timing signal; At this time, the remainder generated in the previous calculation is added to the period of the edge, and then division is performed, and the period of the timing signal is updated based on the calculation result.
[0023]
In this way, each time the rising and falling edges of the pulse signal output from the encoder are detected, the remainder from the previous calculation is added to the period of the detected edge and divided by a predetermined number. Then, the period of the timing signal is calculated and updated.
[0024]
Therefore, even when the acceleration / deceleration region where the carriage moving speed is not constant or when there is a speed fluctuation, the timing signal cycle is updated to an appropriate value with good response.
[0025]
DETAILED DESCRIPTION OF THE INVENTION
Preferred embodiments of the present invention will be described below in detail with reference to the accompanying drawings.
[0026]
In the embodiments described below, a printer using an ink jet recording method will be described as an example of a recording apparatus to which the present invention is applied.
[0027]
In this specification, “recording” (sometimes referred to as “printing”) is not only for forming significant information such as characters and graphics, but also for human beings, regardless of whether it is significant or not. Regardless of whether or not it has been manifested, it also represents a case where an image, a pattern, a pattern or the like is widely formed on a recording medium or the medium is processed.
[0028]
“Recording medium” refers not only to paper used in general recording apparatuses but also widely to cloth, plastic film, metal plate, glass, ceramics, wood, leather, and the like that can accept ink. Shall.
[0029]
Furthermore, “ink” (sometimes referred to as “liquid”) is to be interpreted broadly in the same way as the definition of “recording (printing)” above. It represents a liquid that can be used for forming a pattern or the like, processing a recording medium, or processing an ink (for example, solidification or insolubilization of a colorant in ink applied to the recording medium).
[0030]
In the following description, the expression “interval” of a signal or edge means the same time interval (period) as the period of the signal or edge.
[0031]
<Outline of the main unit>
FIG. 7 is an external perspective view showing an outline of the configuration of an inkjet printer IJRA suitable for applying the present invention. In FIG. 7, the carriage HC engaged with the spiral groove 5004 of the lead screw 5005 that rotates via the driving force transmission gears 5009 to 5011 in conjunction with the forward and reverse rotation of the drive motor 5013 has a pin (not shown). It is supported by the guide rail 5003 and reciprocates in the directions of arrows a and b. On the carriage HC, an integrated ink jet cartridge IJC incorporating a recording head IJH and an ink tank IT is mounted.
[0032]
Reference numeral 5002 denotes a paper pressing plate that presses the recording paper P against the platen 5000 in the moving direction of the carriage HC. Reference numerals 5007 and 5008 denote photo-couplers which are home position detectors for confirming the presence of the carriage lever 5006 in this region and switching the rotation direction of the motor 5013.
[0033]
Reference numeral 5016 denotes a member that supports a cap member 5022 that caps the front surface of the recording head IJH. Reference numeral 5015 denotes a suction unit that sucks the inside of the cap, and performs suction recovery of the recording head through the cap opening 5023. Reference numeral 5017 denotes a cleaning blade, and reference numeral 5019 denotes a member that enables the blade to move in the front-rear direction, and these are supported by a main body support plate 5018. Needless to say, the blade is not in this form, and a known cleaning blade can be applied to this example.
[0034]
Reference numeral 5021 denotes a lever for starting suction for suction recovery, which moves in accordance with the movement of the cam 5020 engaged with the carriage, and the driving force from the driving motor is controlled by a known transmission mechanism such as clutch switching. Is done.
[0035]
These capping, cleaning, and suction recovery are configured so that desired processing can be performed at their corresponding positions by the action of the lead screw 5005 when the carriage comes to the home position side region. As long as the above operation is performed, any of these can be applied to this example.
[0036]
<Description of control configuration>
Next, a control configuration for executing the recording control of the above-described apparatus will be described.
[0037]
FIG. 8 is a block diagram showing the configuration of the control circuit of the inkjet printer IJRA. In the figure, showing a control circuit, 1700 is an interface for inputting a recording signal, 1701 is an MPU, 1702 is a ROM for storing a control program executed by the MPU 1701, and 1703 is various data (the recording signal and recording data supplied to the head). Etc.). Reference numeral 1704 denotes a gate array (GA) that controls supply of recording data to the recording head IJH, and also performs data transfer control among the interface 1700, MPU 1701, and RAM 1703. Reference numeral 1710 denotes a carrier motor for conveying the recording head IJH, and 1709 denotes a conveyance motor for conveying the recording paper. Reference numeral 1705 denotes a head driver for driving the recording head, and reference numerals 1706 and 1707 denote motor drivers for driving the transport motor 1709 and the carrier motor 1710, respectively.
[0038]
The operation of the control configuration will be described. When a recording signal enters the interface 1700, the recording signal is converted into recording data for printing between the gate array 1704 and the MPU 1701. The motor drivers 1706 and 1707 are driven, and the recording head is driven according to the recording data sent to the head driver 1705 to perform recording.
[0039]
Here, the control program executed by the MPU 1701 is stored in the ROM 1702. However, an additional erasable / writeable storage medium such as an EEPROM is added, and the control program is changed from the host computer connected to the inkjet printer IJRA. It can also be configured to be able to.
[0040]
As described above, the ink tank IT and the recording head IJH may be integrally formed to constitute a replaceable ink cartridge IJC. However, the ink tank IT and the recording head IJH can be separated from each other. Then, only the ink tank IT may be exchanged when the ink runs out.
[0041]
<Kick pulse control circuit>
A kick pulse control circuit used in the ink jet printer having the above configuration will be described.
[0042]
FIG. 3 is a block diagram of a kick pulse control circuit for generating a heat pulse, which is a drive signal for the recording head in the ink jet printer. The kick pulse control circuit according to this embodiment includes an edge interval capturing unit 9 and a pulse interval calculating unit 10.
[0043]
Two signals of A phase and B phase are input from the encoder to the kick pulse control circuit, and the edge interval capturing unit 9 changes the rising edge interval of the A phase, the rising edge interval of the B phase each time the input edge changes, Values are output in the order of A-phase falling edge interval and B-phase falling edge interval. In this embodiment, a free-run counter is used as a counter for measuring the edge interval. The pulse interval calculation unit 10 takes in these edge interval values, and performs a process such as a surplus propagation process and a pulse interval update in the middle of generation by updating the edge interval value, and outputs a kick pulse.
[0044]
Hereinafter, the kick pulse control circuit of this embodiment will be described in detail with reference to FIGS. FIG. 4 is a block diagram showing a detailed configuration of the edge interval capturing unit 9, and FIG. 5 is a block diagram showing a detailed configuration of the pulse interval calculation unit 10. FIG. 6 is a timing chart showing the relationship between the A-phase and B-phase signals input to the kick pulse control circuit and the output kick pulses.
[0045]
In FIG. 4 showing the detailed configuration of the edge interval capturing unit 9, reference numeral 15 denotes a free-run counter, which starts counting up the clock simultaneously with the start of the kick pulse generation process. Reference numerals 11 to 14 denote edge detectors, which generate a start pulse when an A-phase rising edge, an A-phase falling edge, a B-phase rising edge, and a B-phase falling edge are detected in order. Reference numerals 17 to 20 denote registers provided corresponding to the edge detectors 11 to 14, respectively. When a start pulse is generated from the corresponding edge detector, the value of the free-run counter 15 at that time is held.
[0046]
Reference numeral 21 denotes a controller that outputs the value of a register connected to the edge detector that has generated the start pulse via the selector 22. For example, when an A-phase rising edge is detected, the controller 21 outputs the value of the register 17 via the selector 22 by a start pulse generated from the edge detector 11. Reference numeral 23 denotes a subtracter that subtracts the output value of the selector 22 from the output value of the free-run counter 15. A register 24 holds the value output from the subtractor 23. That is, every time an edge is measured, the value is stored in the register 24 in the order of A phase rising 1 cycle interval value, B phase rising 1 cycle interval value, A phase falling 1 cycle interval value, and B phase falling 1 cycle interval value. Will be retained.
[0047]
A comparator 16 compares the value of the register 17 and the value of the free-run counter 15, and when they match (when the range that can be measured by the free-run counter is exceeded), an overflow bit is set as error processing. Here, the values of the register 17 and the free-run counter 15 are compared, but the register to be compared may be any register 17-20.
[0048]
In FIG. 5 showing the detailed configuration of the pulse interval calculation unit 10, the register 25 holds the remainder generated from the calculation m / n for obtaining the previous kick pulse interval. The adder 26 adds the edge 1 period interval value output from the edge interval capturing unit 9 and the value held in the register 25. Then, the kick pulse interval value is obtained from the edge 1 period interval value by the register 25, the adder 26, and the shifter 27. In the division of m / n, which is a calculation for obtaining the kick pulse interval, the divisor is a power of 2, so the shifter 27 is used.
[0049]
The register 28 holds the remainder generated from the calculation m / n for obtaining the kick pulse interval two times before. The kick pulse being generated when the edge 1 period interval value is updated using the remainder obtained by the calculation for obtaining the edge 1 period interval value and the previous kick pulse interval by the adder 29, the register 28, and the shifter 30. An interval change value is determined.
[0050]
The register 32 holds a kick pulse interval value to be generated. The counter 33 is set to 1 by the comparator 34 and counts up every time a clock is input. The comparator 34 compares the value of the register 32 with the value of the counter 33, and outputs a signal corresponding to ON of the kick pulse when the counter value is 1, for one clock period. Thereafter, a signal corresponding to the OFF of the kick pulse is output until the value of the register 32 matches the counter value, and the value of the counter 33 is set to 1.
[0051]
The comparator 35 compares the generated kick pulse interval value held in the register 32 with the changed value of the kick pulse when the edge 1 period interval value from the shifter 30 is updated, and the value of the counter 33 indicates the changed value. If not exceeding, the value of the register 32 is changed to the value of the shifter 30 when the edge 1 period interval value is updated. However, when the value of the counter 33 is larger than the value of the shifter 30, this processing is performed after the next kick pulse is generated.
[0052]
That is, the kick pulse interval is changed after the next kick pulse is generated only when the change value is smaller than the current interval and the value of the counter 33 (current count value) is larger than the change value.
[0053]
The kick pulse is ANDed with the overflow signal output from the edge interval capturing unit 9, and is not output in the case of overflow.
[0054]
As described above, in this embodiment, the rising and falling edge interval values of the A phase and the B phase output from the encoder are fetched, and the remaining propagation processing, updating the pulse interval in the middle of generation by updating the edge interval value, etc. Process and output kick pulse.
[0055]
These processes will be described with reference to the timing chart of FIG. In FIG. 6, S3 and S4 are A-phase and B-phase signals output from the encoder, and P2 is an output kick pulse.
[0056]
When the B phase falling period interval measured from time t7 to t11 is 79 and the remainder is 2 according to the kick pulse interval calculation immediately before t11, the leading pulse at t11 is
(79 + 2) / 8 = 10 ... remainder 1
Thus, the first pulse interval at t11 is 10. Due to the excess propagation, the next pulse interval becomes
(79 + 1) / 8 = 10 ... remainder 0
Thus, the pulse interval is set to 10.
[0057]
While generating the pulse at this interval, the rising period interval of the A phase measured from t8 to t12 is measured, and since this value is 76, when the pulse interval is calculated again based on this value,
(76 + 1) / 8 = 9 ... remainder 5
It becomes. At this time, the pulse interval during generation is updated from 10 to 9 when the edge interval is updated at t12.
[0058]
Therefore, according to the embodiment described above, since a surplus propagation process is performed, it is possible to generate a kick pulse having a good response to a speed change even in a region where the carriage is accelerating / decelerating.
[0059]
In the above embodiment, the propagated remainder is reset at the start of carriage scanning. When recording by reciprocating scanning, the complement of the remainder at the time of generating the final pulse of the forward path is used as the remainder at the start position of the backward path. Further, when the pulse interval is equal to or less than the minimum pulse interval that is a threshold value for compensating all nozzle ejections, the pulse interval is set to the minimum pulse interval.
[0060]
<Other embodiments>
The embodiment described above applies the present invention to an ink jet recording apparatus, but the present invention adopts other systems as long as the recording apparatus performs recording by scanning a carriage having a recording head mounted thereon. It can also be applied to a recording apparatus.
[0061]
Further, the kick pulse interval may be obtained by dividing by a number other than the number of divisions (8) of the edge interval in the above embodiment. Alternatively, the kick pulse may be generated based on the rising and falling edge intervals of either the A phase or the B phase instead of both the A phase and the B phase of the encoder signal.
[0062]
The present invention can be realized as a recording apparatus control method and a recording apparatus as described above, and a computer program for causing the computer to execute the recording position control method and the recording apparatus , and a storage medium for storing the computer program. Specifically, even when applied to a system composed of a plurality of devices (for example, a host computer, an interface device, a reader, a printer, etc.), an apparatus (for example, a copy) composed of a single device The present invention may be applied to a machine, a facsimile machine, etc.
[0063]
Another object of the present invention is to supply a storage medium storing software program codes for implementing the functions of the above-described embodiments to a system or apparatus, and the computer (or CPU or MPU) of the system or apparatus stores the storage medium. Needless to say, this can also be achieved by reading and executing the program code stored in the.
[0064]
In this case, the program code itself read from the storage medium realizes the functions of the above-described embodiments, and the storage medium storing the program code constitutes the present invention.
[0065]
As a storage medium for supplying the program code, for example, a floppy disk, a hard disk, an optical disk, a magneto-optical disk, a CD-ROM, a CD-R, a magnetic tape, a nonvolatile memory card, a ROM, or the like can be used.
[0066]
Further, by executing the program code read by the computer, not only the functions of the above-described embodiments are realized, but also an OS (operating system) operating on the computer based on the instruction of the program code. It goes without saying that a case where the function of the above-described embodiment is realized by performing part or all of the actual processing and the processing is included.
[0067]
Further, after the program code read from the storage medium is written into a memory provided in a function expansion board inserted into the computer or a function expansion unit connected to the computer, the function expansion is performed based on the instruction of the program code. It goes without saying that the CPU or the like provided in the board or the function expansion unit performs part or all of the actual processing, and the functions of the above-described embodiments are realized by the processing.
[0068]
【The invention's effect】
As described above, according to the present invention, each time the rising and falling edges of the pulse signal output from the encoder are detected, the remainder in the previous calculation is added to the period of the detected edge. The period of the timing signal is calculated and updated by dividing it by a predetermined number.
[0069]
Therefore, even when the acceleration / deceleration region where the carriage moving speed is not constant or when there is a speed fluctuation, the timing signal cycle is updated to an appropriate value with good response.
[Brief description of the drawings]
FIG. 1 is a timing chart of kick pulses generated by a conventional method.
FIG. 2 is a block diagram showing a configuration of a conventional kick pulse control circuit.
FIG. 3 is a block diagram showing a schematic configuration of a kick pulse control circuit according to the present invention.
4 is a block diagram showing a configuration of an edge interval capturing unit in FIG. 3;
5 is a block diagram showing a configuration of a pulse interval calculation unit in FIG. 3. FIG.
FIG. 6 is a timing chart of kick pulses generated according to the present invention.
FIG. 7 is a view showing an appearance of an ink jet printer according to the present invention.
FIG. 8 is a block diagram showing a control configuration of the printer of FIG. 7;
[Explanation of symbols]
S1, S3 Encode signal (A phase)
S2, S4 Encode signal (B phase)
P1, P2 Kick pulse 1 Edge detector 2, 6 Counter 3 Shifter 4 Register 5 Selector 7 1 detector 8 Pulse controller 9 Edge interval capturing unit 10 Pulse interval calculating unit 11, 12, 13, 14 Edge detector 15 Free-run counter 16, 34, 35 Comparator 17-20, 24, 25, 28, 32 Register 21 Controller 22, 31, 36 Selector 23 Subtractor 26, 29 Adder 27, 30 Shifter

Claims (5)

A method for controlling a recording apparatus that scans a carriage mounted with a recording head having a recording element on a recording medium and performs recording based on a timing signal that defines drive timing of the recording element,
A measuring step of rising and falling edges the edge of each interval falling the rising edge and the falling of the pulse signal output from the encoder is measured every sensed according to the position in the scanning direction of the carriage,
Each time the edge interval for one cycle is measured in the measuring step, the period of the timing signal is obtained by dividing the result of the addition processing of the measured edge interval and the remainder generated by the division processing by a predetermined number. And a calculation step of outputting the timing signal based on the calculation result;
Including
The calculation step includes
When the edge interval for one period is measured, the measured edge interval is added to the remainder generated by the division processing at the previous cycle calculation of the timing signal, and the addition result is divided by the predetermined number. And a second operation for adding the measured edge interval and the remainder generated by the division processing at the time of the previous cycle calculation of the timing signal, and dividing the addition result by the predetermined number; An arithmetic processing step for performing
A selection step of selecting one of the first quotient obtained by the division process at the time of the first calculation and the second quotient obtained by the division process at the time of the second calculation and holding the selected quotient in the holding unit; ,
After the first and second calculations are performed in the calculation processing step, the second quotient obtained in the calculation processing step at the edge interval of the next cycle is held in the holding means. An update step of updating the value held in the holding means with the second quotient obtained at the edge interval of the next period,
An output step of outputting the timing signal at intervals based on the value held in the holding means;
A control method for a recording apparatus. A recording apparatus that scans a carriage mounted with a recording head having a recording element on a recording medium, and performs recording based on a timing signal that defines a driving timing of the recording element,
Measuring means the rising and falling edges during each interval rising edge and the falling edge of the pulse signal output from the encoder is measured every sensed according to the position in the scanning direction of the carriage,
Each time the edge interval for one cycle is measured by the measuring means, the period of the timing signal is obtained by dividing the result of the addition processing of the measured edge interval and the remainder generated by the division processing by a predetermined number. Calculating means for outputting the timing signal;
With
The computing means is
When the edge interval for one period is measured, the measured edge interval is added to the remainder generated by the division processing at the previous cycle calculation of the timing signal, and the addition result is divided by the predetermined number. And a second operation for adding the measured edge interval and the remainder generated by the division processing at the time of the previous cycle calculation of the timing signal, and dividing the addition result by the predetermined number; Arithmetic processing means for performing
Holding means for selecting and holding either the first quotient obtained by the division process at the time of the first calculation or the second quotient obtained by the division process at the time of the second calculation;
After the first and second calculations are performed by the calculation processing unit, the second quotient obtained by the calculation processing unit at the edge interval of the next cycle is held in the holding unit. An update means for updating the value held in the holding means with the second quotient obtained at the edge interval of the next period,
Output means for outputting the timing signal at intervals based on values held in the holding means;
A recording apparatus comprising: The computing means is
  Remainder holding means for holding a remainder generated by the division process at the time of the previous cycle calculation of the timing signal and a residue generated by the division process at the time of the previous cycle of the timing signal by the cycle calculation.
  The recording apparatus according to claim 2, further comprising: The computing means is
  Comparing means for comparing the value held in the holding means with the second quotient obtained at the edge interval of the next period
  The recording apparatus according to claim 2, further comprising: The measuring means includes
Billing before Kipa pulse signal of one period between the interval of the rising edge, claim 2, characterized in that it comprises a falling edge interval holding means for holding the interval of one period of an edge of the pulse signal Item 5. The recording device according to any one of items 4 to 6.

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