KR19990010995A - How to compensate the band width of shuttle scanner module - Google Patents

Abstract

The present invention relates to a band width twist compensation method of the shuttle scanner module, and more particularly, to a method for correcting a twist by automatically adjusting a band width by testing a twist of the shuttle scanner module. A test pattern printing and scanning step of printing a test pattern and scanning a printed test pattern, an ADC value storing step of converting and storing the data scanned in the test pattern printing and scanning step from analog data to digital data, and the ADC When the ADC value of the test pattern is stored in the value storing step, the number of dots is changed according to the misalignment calculation step of comparing the stored ADC values and calculating misalignment data and the misalignment data calculated in the misalignment calculation step. Dot and LF motor step number changing step to change the LF motor step number. Characterized in that configured.

Description

How to compensate for band width misalignment of the shuttle scanner module

The present invention relates to a band width twist compensation method of a shuttle scanner module, and more particularly, to a method of correcting a twist by automatically adjusting a band width by testing a twist of a shuttle scanner module.

Recently, with the development of electric and electronic technology, a multifunction device in which a scanner, a fax, and a printer, which are separately configured office automation devices, is combined and developed, has been developed. The multifunction printer, which is a combination of a scanner, a fax machine, and a printer, can minimize the space occupancy rate of office automation equipment, which has been individually installed and occupied a lot of space as office work is automated.

In addition, the use of a multi-function multifunction device that is used by a user in a variety of tasks dealing with many devices has resulted in an increase in work efficiency. In addition, manufacturers can reduce manufacturing costs by integrating common driving parts in scanners, fax machines and printers into one.

The scanning method in a multifunction printer, which combines a scanner, a fax and a printer, is divided into a sheet feed method and a flat bed method. The sheet feed method is a method of scanning information by moving only the document in which the information is recorded in the vertical direction while the scanner is fixed. In addition, the flat bed method is a method in which a scanner is modularized and scanned while moving a sheet on which information is recorded.

A more general scanning method is a scanning method commonly used as a sheet feed method. This sheet feed method has a problem in that the processing speed decreases as the scanning of the document on which the information is recorded is performed through a continuous operation. In addition, in order to mount the scanner to which the sheet feed method is applied to the multifunction apparatus, the multifunction apparatus becomes large due to taking up more space.

In order to solve this problem, the inkjet printer uses a shuttle scanner module mounted on one side of the inkjet printhead, thereby miniaturizing the overall size of the multifunction device. The shuttle scanner module configured to be mounted on one side of the inkjet printhead scans the document in which information is recorded into a predetermined band in order to further improve the scanning speed.

That is, as shown in Fig. 1, the shuttle scanner module 10 uses 27 pieces of one band area as 203.2 x 10.8 mm (2400 x 128 dots) when the document in which the information is recorded is A4 size. The scan is divided into bands. In this case, vertical scanning lines such as b slices are twisted and scanned in a slice normally scanned according to a process of mounting or detaching the shuttle scanner module 10 or a long time of use.

As such, when one slice is scanned incorrectly when scanning a document on which a information is recorded when scanning in a multifunction apparatus to which a shuttle scanner module is applied, a discontinuity occurs and an image scanned due to the generated discontinuity Printing data causes a problem that the print quality is rough.

Therefore, in order to solve the above-described problem, when scanning the information recorded in the document through a shuttle scanner module mounted on the multifunction device, smoothing by removing the discontinuity by adjusting the band (Band) width The purpose is to obtain image data.

In order to achieve the above object, the present invention provides a test pattern printing and scanning step for printing a test pattern and scanning a printed test pattern, and converting the data scanned in the test pattern printing and scanning step from analog data to digital data. A distortion-compensation calculation step for calculating misalignment data by comparing the stored ADC values when the ADC value storage step for storing the ADC value of the test pattern is stored in the ADC value storage step; It is characterized by consisting of a dot number and the LF motor step number changing step of changing the number of dots (dot) according to the data and the number of LF motor steps.

1 is a state diagram showing a distortion phenomenon during scanning using a shuttle scanner module,

2 is a flow chart showing a scanner distortion correction method according to the present invention;

3 is a distortion phenomenon during scanning using the shuttle scanner module according to the present invention

State diagram showing how to correct,

Figure 4 is a block diagram showing the internal circuit configuration of the multifunction device to which the present invention is applied,

5 is a perspective view showing a driving mechanism of the multifunction apparatus to which the present invention is applied.

Hereinafter, the present invention will be described with reference to FIGS. 2 to 2.

1 is a flow chart showing a scanner distortion correction method according to the present invention. As shown, the start step (S110) for driving the multifunction device to correct the misalignment during scanning in the multifunction device, and when the multifunction device is driven in the start step (S110), a test pattern (A) is printed and a printed test Test pattern printing and scanning step (S120) for scanning the pattern (A), and the data scanned in the test pattern printing and scanning step (S120) (Analog to digital conversion; hereinafter abbreviated as ADC) The ADC value storage step (S130) and the ADC value of the test pattern (A) are stored in the ADC value storage step (S130) to compare the stored ADC value by comparing the stored ADC value to calculate the distortion complement data (S140) and the number of dots and the LF for changing the number of dots and changing the number of LF motor steps according to the distortion supplement data calculated in the distortion supplement calculation step (S140). Scanning by compensating for the shift in accordance with the number of dots and the number of LF motor steps changed according to the shift complementary data in the number of motor step changing step S150 and the number of dots and the number of LF motor step changing step S150 And the end step (S160) of ending the work.

During this configuration, the test pattern printing and scanning step (S120) includes a test pattern printing step (S120a) for printing a test pattern A by transferring printing paper when the multifunction apparatus is driven in the start step (S110), and When the test pattern A is printed on the printing paper in the test pattern printing step S120a, a reverse feeding step S120b for reverse feeding the document on which the test pattern A is printed, and the reverse feeding ( Feeding) When the document on which the test pattern A is printed in step S120b is fed back to the scanning position, the test pattern scanning step S120c scans the test pattern A printed on the document. .

The misalignment calculation step (S140) includes an Nth ADC value read step (S140a) for reading an Nth ADC value from the ADC value stored in the ADC value storage step (S130), and the Nth When the N-th ADC value is read in the ADC value read step S140a, a step S140b for comparing whether the read N-th ADC value is smaller than 3FH, and the read-in N-th ADC value is greater than 3FH The dot position storing step S140c for storing the dot position and the read Nth ADC if the Nth ADC value is not smaller than 3FH as a result of the comparison of the step S140b for comparing the smallness. As a result of the comparison in step S140b of comparing the value less than 3FH, if the Nth ADC value is less than 3FH or the dot position is stored in the dot position storing step S140c, the ADC value is increased. When the ADC value is increased in the ADC value increasing step S140d and the ADC value increasing step S140d, the increased ADC value is 128. The comparison result of the step (S140e) of comparing the smaller than the dot (Dot) and the step (S140e) of comparing whether the increased ADC value is smaller than 128 dots (Dot) If the ADC value is smaller than 128 dots (Dot) ADC It is composed of a return step (S140f) that returns to the N-th ADC value read step (S140a) to increase the value by 128 dots.

Looking at this configuration in more detail with reference to Figures 4 to 5 as follows.

First, the general operation of the multifunction apparatus 100 will be briefly described. When a user turns on or executes a reset through an operation means (not shown), the CPU 120 may store a system control program stored in the system memory 110. Alternatively, the initialization operation is executed by reading the initial setting condition data and the like.

The printer driver and the extended capability port of the multifunction peripheral 100 for printing a data generated by the user selecting a program using the PC 200 and executing the selected program while the multifunction apparatus 100 is initialized. It is transmitted to the CPU 120 through the ECP 130b of the Extended Capability Port (hereinafter, abbreviated to ECP) 130. The print data transmitted to the CPU 120 is processed through the CPU 120 and applies a control signal accordingly to the print driver 130a. At this time, the ECP 130b is a bidirectional parallel interface module based on IEEE 1284, and is used to transmit and receive data generated by the PC 200 and the multifunction apparatus 100.

The print driver 130a receiving a control signal output from the CPU 120 receiving the print data transmitted through the ECP 130b controls the printhead 140a according to the applied control signal to execute a print job. To generate a control signal. That is, the print driver 130a may include a printhead 140a fire and an enable control signal, a phase and position control signal of the CR motor 140e, and a printhead required for a print job. Various control signals for controlling data handling and the LF motor 140g are generated and output.

The control signal generated by the print driver 130a is transmitted to the print mechanism 140 to prepare for the print job. That is, the printing paper stored in the paper feeder 100a storing the original or the printing paper is transferred to the printing position of the print head 140a.

In order to print the print paper at the printhead 140a bottom printing position, the LF motor 140f is rotated in accordance with a control signal applied from the print driver 130a to print the print paper by the frictional force of the LF roller 140g. Transfer to.

When the print paper is transferred to the print position on the bottom surface of the print head 140a, the CR motor 140e, which receives the control signal output from the print driver 130a, rotates according to the applied control signal and rotates through the time belt 140d. The carrier 140b on which the print head 140a is mounted is reciprocated left and right along the guide shaft 140c.

The printhead 140a mounted on the carrier 140b which performs the reciprocating motion along the guide shaft 140c by the CR motor 140a is ink according to the data generated by the CPU 120 on the transferred printing paper. Spraying to form a factor. Through this continuous operation, the multifunction apparatus 100 continuously prints the print data generated by the PC 200 to complete a print job.

In addition, the rasterizer 180 is used to transform the scanned raw data for transferring the scanned data scanned through the shuttle scanner module 160 to the print mechanism 140 or the PC 200, The matrix-converted converted data is modulated by the modem and the LIU unit 190 to process the fax signal to be transmitted to the outside via the PSTN network.

In this general operation, the user initializes the multifunction apparatus 100 in a start step S110 for correcting a misalignment of the shuttle scanner module 160. When the multifunction peripheral 100 is initialized, the CPU 120 executes the test pattern printing step S120a of the test pattern printing and scanning step S120 to print the test pattern A. FIG. That is, the test pattern is read from the system memory 110 in which the test pattern A is stored to generate a control signal for printing the test pattern A to the print driver 130a.

The print driver 130a receiving the control signal for printing the test pattern A transfers the print paper stored in the paper feeder 100a to the print position of the printhead 140a according to the applied control signal to print. do. At this time, the test pattern A prints one slice in one band in the 100th position of the printing paper as shown in FIG. When the test pattern A is printed by the printhead 140a, the printing paper on which the test pattern A is printed is fed back through the reverse feeding step S120b.

That is, the CPU 120 transmits a control signal for reversely rotating the LF motor 140f to the print driver 130a by printing the printed sheet on which the test pattern A is printed, and printing the printed sheet on which the test pattern A is printed. It feeds back to the scanning position. When the printed paper on which the test pattern A is printed is fed back to the scanning position and fed to the scanning position, the test pattern scanning step S120c transmits the control signal generated by the CPU 120 to the image processing unit 150. It transmits and scans the test pattern (A) printed on the printing paper through the shuttle scanner module 160 controlled by the image processing unit 150.

When the test pattern A is scanned through the shuttle scanner module 160, the test pattern A scanned in the ADC value storing step S130 is converted into analog data through an ADC means (not shown) in the image processing unit 150. The digital data is converted into digital data in the system memory 110. At this time, if the ADC means has an 8-bit (bit) sampling period, the data sampled with the digital data is sampled in 256 steps.

In other words, the data sampled as digital data has a black level of 00H in hexadecimal and a white level of FFH in hexadecimal. In this case, the black level is defined as the 00H to 3FH area in consideration of noise generated in the process of scanning the test pattern A and sampling the scanned analog data.

As described above, when the sampled DAC value is stored in the system memory 110 by scanning the test pattern A, the Nth, that is, the first sampled dot is selected in the N-th ADC value read step S140a. Read When the Nth dot representing the first sampled dot is read, in step S140b of comparing whether the read Nth ADC value is smaller than 3FH, the read Nth dot is black level 00H. It is compared with whether it exists in -3FH area | region.

As a result of the comparison, in the area of 00H to 3FH which is the black level, in the ADC value increasing step S140d, the Nth dot is increased to N + 1 in order to compare the next dot (N = N + 1). When the ADC value is increased, if the ADC value is increased in the ADC value increasing step S140d, a step S140e for comparing whether the increased ADC value is smaller than 128 dots is executed. S140f) is executed to read the next dot.

In step S140b of comparing whether the read Nth ADC value is smaller than 3FH, if the read Nth dot is not within the black level 00H to 3FH region, the dot position storing step S140c. The Nth dot position is checked through the memory, and the position is temporarily stored in the system memory 110. When the position of the dot is temporarily stored in the system memory 110, this operation is executed in successive 10 dots, and as a result, the data is stored in the system memory 110 unless it is within the black level 00H to 3FH area. Save it.

On the contrary, 10 dots (Dot) are executed in succession, and as a result, the data is erased in the system memory 110 when it is in the 00H to 3FH area which is the black level. This continuous operation is confirmed by comparing and successively through the ADC value increasing step S140d and the returning step S140f that returns. For data whose continuous 10 dots or more stored in the system memory 110 are not in the 00H to 3FH area of the black level, the number is checked through the dot number and the LF motor step number changing step (S150). Accordingly, the number of steps for controlling the LF motor 140f is changed, and the misalignment of the shuttle scanner module 160 is terminated through the termination step S150.

For example, as shown in FIG. 3, if the 1 slice deviation is 1/2, the first dot is OOH and the 128 dots are 1/2, and the half is black and the white is 1/2, respectively. Since it is a state, it has a value of 7FH. Therefore, the value of 3FH becomes the 64th dot (Dot), which is 1/2 of 128 dots, which is 5.4mm vertically.

In this way, you can see the band width that can be discontinuously seen by the band, and black can be recognized as black up to 64 dots. Therefore, since the width of the band showing the continuity obtained by the test pattern is 64 dots, change the value of the register related to the number of dot processing in the image processing unit to 64 dots, and change the value of the movement step of the LF motor to move by 5.4mm. By doing so, it is possible to prevent distortion of the image during scanning.

As described above, the present invention can solve the distortion of the scanned image during scanning of the shuttle scanner module by adjusting the band width, thereby eliminating discontinuities generated between bands, thereby obtaining a smooth image during scanning. It has an effect.

Claims (3)

A test pattern printing and scanning step of printing a test pattern and scanning a printed test pattern, An ADC value storage step of converting and storing the data scanned in the test pattern printing and scanning step from analog data to digital data; If the ADC value of the test pattern is stored in the ADC value storage step, the misalignment complementation calculation step of comparing the stored ADC value to calculate misalignment data; Band of the shuttle scanner module including a dot number for changing a dot number and a LF motor step number changing step and a LF motor step number changing step according to the distortion supplement data calculated in the distortion supplement calculation step. ) How to compensate for width skew. The method of claim 1, The test pattern printing and scanning step, A test pattern printing step of printing a test pattern by transferring printing paper; A reverse feeding step of feeding back the original on which the test pattern is printed, when the test pattern is printed on the printing paper in the test pattern printing step; Band of the shuttle scanner module, characterized in that the test pattern scanning step for scanning the test pattern printed on the document when the document printed with the test pattern in the reverse feeding (feeding step) is fed back to the scanning position How to compensate for width skew. The method of claim 1, The misalignment calculation step, An N-th ADC value read step of reading an N-th ADC value from the ADC value stored in the ADC value storing step; Reading the N-th ADC value from the N-th ADC value reading step, comparing the read-out N-th ADC value with less than 3FH, and A dot position storing step of storing a dot position if the N-th ADC value is not less than 3FH as a result of comparing the read N-th ADC value less than 3FH; As a result of comparing the read Nth ADC value is less than 3FH, the ADC value if the Nth ADC value is less than 3FH or the dot position is stored in the dot position storage step. ADC value increasing step to increase the, Comparing the increased ADC value to less than 128 dots when the ADC value is increased in the ADC value increasing step; As a result of comparing the step of comparing the increased ADC value to less than 128 dots, if the ADC value is smaller than 128 dots, the N-th ADC is increased to increase the ADC value by 128 dots. Compensating for the band width of the shuttle scanner module, characterized in that it comprises a return step of returning to the value read step (S140a).