JP2018205239A - Transfer amount detector and recording medium - Google Patents

Abstract

To provide a transfer amount detector that can accurately detect the transfer amount of a recording target medium while suppressing increase in the size and cost.SOLUTION: Light sources 1 and 2 and a collimator lens emit a first light and a second light to a recording target medium being carried. An imaging sensor 5 takes an image of the recording target medium and obtains the image, using light from the recording target medium according to the first light and the second light. The pattern matching unit 17 detects the transfer amount of the recording target medium, using a first partial image according to the first light contained in the taken image. A distance detection unit 60 detects a medium distance between the imaging means and the recording target medium, using a second image according to the second light contained in the taken image. A correction unit 21 corrects the transfer amount based on the medium distance.SELECTED DRAWING: Figure 6

Description

  The present invention relates to a conveyance amount detection apparatus and a recording apparatus that detect a conveyance amount of a recording medium.

A recording apparatus for recording on a recording medium includes a recording head capable of recording an image for a predetermined recording width (for example, 1 inch width), and records the recording medium every time the recording head performs a recording operation. There is a serial recording system that conveys the width. In a serial recording type recording apparatus, the actual transport amount transported due to slipping of the recording medium on the transport roller that transports the recording medium, or due to differences in conditions such as the material and thickness of the recording medium May deviate from the specified value. In this case, streaks are formed at the boundary portion of the image recorded in each recording operation, and the image quality of the image is degraded. For example, when the actual transport amount is shorter than a specified value, the images overlap at the boundary portion of the image recorded by each recording operation, and a dark streak is formed. When the actual transport amount is longer than the specified value, a gap is generated at the boundary portion of the image recorded by each recording operation, and a thin stripe is formed.
For this reason, the recording apparatus divides the image for the recording width into one recording operation and records the recording width for a plurality of recording operations in accordance with the desired image quality. What switches the multipath mode to perform is known. In the multi-pass mode, it is possible to reduce the deviation of the conveyance amount per time by conveying the recording medium a plurality of times with a conveyance amount shorter than the recording width. Can be reduced.
However, since the recording time becomes long in the multi-pass mode, it is required to adjust the transport amount of the recording medium to reduce the number of recording operations. For this purpose, it is necessary to detect the transport amount.
Patent Document 1 discloses a recording apparatus capable of detecting a conveyance amount. The recording apparatus captures a recording medium every time the recording medium is transported, and detects a transport amount by comparing a characteristic portion shown in the captured image before and after the transport. Further, in this recording apparatus, the medium distance between the imaging unit that performs imaging and the recording medium may vary due to floating or distortion of the recording medium. In this case, the imaging magnification by the imaging optical system that forms an image on the imaging unit changes, and as a result, the detection error of the carry amount becomes large. For this reason, in this recording apparatus, the same area on the recording medium is imaged using a plurality of imaging optical systems, and a plurality of captured images corresponding to each imaging optical system are compared, so that Detection errors caused by fluctuations are reduced.

Japanese Patent No. 5171486

  However, the recording apparatus described in Patent Document 1 requires a plurality of imaging optical systems, and thus has a problem of increasing the size and cost. It is also conceivable to use a telecentric optical system that can suppress a change in the imaging magnification instead of the imaging optical system. However, the telecentric optical system is expensive and requires a relatively long lens barrel. Even in this case, there is a problem in that the size and cost increase.

  The present invention has been made in view of the above problems, and provides a conveyance amount detection apparatus and recording capable of accurately detecting the conveyance amount of a recording medium while suppressing an increase in size and cost. The purpose is to do.

The conveyance amount detection device according to the present invention includes an irradiation unit that irradiates the recording medium being conveyed with first and second light, and the first and second light that is irradiated by the irradiation unit. An imaging unit that captures an image of the recording medium by using light from the recording medium to obtain a captured image, and a first image corresponding to the first light included in the captured image, A distance between the imaging unit and the recording medium is detected by using a detection unit that detects a conveyance amount of the recording medium and a second image corresponding to the second light included in the captured image. And a correction unit that corrects the transport amount based on the distance.
Further, the recording apparatus according to the present invention includes the transport amount detection device, a transport unit that transports the recording medium, and the recording target by the transport unit based on the transport amount corrected by the transport amount detection device. And a recording control means for adjusting the transport amount of the medium.
Another recording apparatus according to the present invention includes the conveyance amount detection device, a conveyance unit that conveys the recording medium, a recording unit that records on the recording medium based on recording data, and the conveyance amount detection. Recording control means for correcting the recording data based on the transport amount corrected by the apparatus.

  According to the present invention, the image pickup means and the recorded image in which the carry amount detected using the first image corresponding to the first light is detected using the second image corresponding to the second light Correction is performed based on the distance to the medium. Therefore, it is possible to correct the transport amount of the recording medium based on the distance between the image pickup means and the recording medium without using a plurality of imaging optical systems, thereby increasing the size and cost. It is possible to detect the transport amount of the recording medium with high accuracy while suppressing the above.

1 is a perspective view illustrating an appearance of a recording apparatus according to a first embodiment of the present invention. 1 is a block diagram illustrating a configuration of a recording apparatus according to a first embodiment of the present invention. It is a figure which shows the structure of a conveyance amount sensor. It is a figure for demonstrating the movement amount detection operation | movement by a conveyance amount sensor. It is a figure for demonstrating the distance detection operation | movement by a conveyance amount sensor. It is a block diagram which shows the structure of the conveyance amount detection apparatus of the 1st Embodiment of this invention. It is a figure which shows an example of a correction coefficient table. It is a figure for demonstrating an example of operation | movement of the conveyance amount detection apparatus of the 1st Embodiment of this invention. It is a flowchart for demonstrating an example of operation | movement of the conveyance amount detection apparatus of the 1st Embodiment of this invention. It is a block diagram which shows the structure of the conveyance amount detection apparatus of the 2nd Embodiment of this invention. It is a flowchart for demonstrating an example of operation | movement of the conveyance amount detection apparatus of the 2nd Embodiment of this invention.

Embodiments of the present invention will be described below with reference to the drawings. In addition, in each drawing, the same code | symbol is attached | subjected to what has the same function, and the description may be abbreviate | omitted.
(First embodiment)
FIG. 1 is a perspective view showing the appearance of the recording apparatus according to the first embodiment of the present invention. A recording apparatus 100 shown in FIG. 1 includes a recording head 101 that ejects liquid such as ink, a carriage 102 that includes the recording head 101, a tank 103 that stores liquid to be supplied to the recording head 101, and a recording medium P. A paper feeding mechanism 104 for feeding paper.
The recording head 101 includes a heater (not shown) that generates thermal energy as an energy generating element that generates energy for ejecting liquid, and according to a logic signal input from a host device (not shown in FIG. 1). The heater is driven to discharge the liquid. Further, the recording head 101 can record an image having a predetermined recording width (for example, 1 inch width) by one recording operation. The logic signal includes, for example, recording data indicating an image to be recorded.
The carriage 102 can reciprocate in the scanning direction A indicated by the arrow in the drawing. The scanning direction A in which the carriage 102 reciprocates and the direction in which the recording medium P is conveyed intersect each other (preferably orthogonally). In a recording operation in which an image is recorded by ejecting liquid, the recording apparatus 100 ejects liquid from the recording head 101 while reciprocating the carriage 102 in the scanning direction A. The recording apparatus 100 records the image on the recording medium P by transporting the recording medium P in accordance with the ejection of the liquid.
The tank 103 can be attached to and detached from the carriage 102. In this embodiment, in order to record a color image, the tank 103 stores a plurality of colors of ink as liquids. Specifically, the tank 103 has four tanks for storing magenta (M), cyan (C), yellow (Y), and black (K) inks, and each tank can be attached and detached independently. It is.
Further, the recording apparatus 100 includes a conveyance amount sensor 105 for detecting the conveyance amount of the recording medium P. In the illustrated example, the transport amount sensor 105 is provided on the side opposite to the recording surface side of the recording medium P, but may be provided on the recording surface side of the recording medium P.

FIG. 2 is a block diagram showing the configuration of the control system of the recording apparatus 100. As shown in FIG. 2, the recording apparatus 100 includes a recording head 101, a transport motor 201 that is a transport unit that transports the recording medium P, and a transport motor driver 202 that controls the transport motor 201. The recording apparatus 100 also includes a carriage motor 203 that drives the carriage 102, a carriage motor driver 204 that controls the carriage motor 203, and an interface unit 205 that is communicably connected to the host apparatus 200. The interface unit 205 receives a logic signal from the host device 200, for example.
Furthermore, the recording apparatus 100 includes a switch group 210, a sensor group 220, and a controller 230. The switch group 210 includes a plurality of switches that receive instructions from the user and output as switch signals. In the illustrated example, the switch group 210 is a power switch 211 for turning on power to the recording apparatus 100, a print switch 212 for instructing the start of a recording operation, and an instruction for executing a recovery process. The recovery switch 213 is included. The recovery process is a process for maintaining the ejection performance of the recording head 101 in a good state.
The sensor group 220 includes a plurality of sensors that detect the state of the recording apparatus 100 and output detection signals. The sensor group 220 includes a conveyance amount sensor 105 and a temperature sensor 221 that detects the temperature of the recording apparatus 100 in the example of the figure. The sensor group 220 may include a photo sensor (not shown) that detects the remaining amount of liquid in the tank 103 shown in FIG.

The controller 230 controls the entire recording apparatus 100. The controller 230 includes a ROM (Read Only Memory) 231, a RAM (Random Access Memory) 232, an A / D converter 233, an I / O unit 234, and a system bus 235. Further, the controller 230 includes an ASIC (Application Specific Integrated Circuit) 236 and an MPU (Micro-Processing Unit) 237.
The ROM 231 is a recording unit that records a program that can be read by the ASIC 236 and the MPU 237. The ROM 231 records control data for controlling the recording apparatus 100 such as various tables and fixed data, in addition to programs. The RAM 232 is used as a development area for logical signals input to the interface unit 205 and a work area for programs recorded in the ROM 231.
The A / D converter 233 converts the detection signal of the analog signal from the sensor group 220 into a digital signal and transmits it to the MPU 237.
The I / O unit 234 receives a switch signal from the switch group 210 and a digital signal detection signal from the sensor group 220. The system bus 235 connects the ROM 231, RAM 232, I / O unit 234, ASIC 236, and MPU 237 so that they can communicate with each other.
The ASIC 236 controls the carry motor 201 and the carriage motor 203 using the carry motor driver 202 and the carriage motor driver 204. The ASIC 236 controls the recording head 101 based on the logic signal received by the interface unit 205.
The MPU 237 is a recording control unit that performs a recording control process for controlling a recording operation via the ASIC 236 based on conveyance amount data that is a detection result of a conveyance amount detection device described later.

FIG. 3 is a diagram illustrating a detailed configuration of the carry amount sensor 105. As shown in FIG. 3, the carry amount sensor 105 includes light sources 1 and 2, a collimating lens 3, an imaging lens 4, and an imaging sensor 5.
The light sources 1 and 2 and the collimating lens 3 constitute irradiation means for irradiating the recording medium P being conveyed with the first light and the second light. Specifically, the light source 1 and the collimating lens 3 are first irradiation means for irradiating the recording medium P with the first light, and the light source 2 is the second light for the recording medium P. It is the 2nd irradiation means to irradiate. It is desirable that the light sources 1 and 2 can adjust the light amount and the irradiation time (lighting time).
The light source 1 is, for example, an LED (Light Emitting Diode). The collimating lens 3 converts the light from the light source 1 into parallel light and irradiates the recording medium P as first light. The light source 2 irradiates the recording medium P with the second light.
The irradiation area of the second light on the recording medium P is smaller than the irradiation area of the first light on the recording medium P. In this embodiment, the second light is spot light (spot-shaped light), and the size of the spot (spot light irradiation area) is about several pixels of the image sensor 5. For this reason, the light source 2 for irradiating the second light is preferably a semiconductor laser. The second irradiating means may have a configuration in which the light source 2 is an LED, and a condensing optical system (not shown) that condenses light from the light source 2 and converts it into spot light.
The first light is used to detect the transport amount (movement amount) of the recording medium P, and the second light detects the medium distance that is the distance between the recording medium P and the image sensor 5. Used to do. In FIG. 3, two recording media P1 and P2 having different media distances are shown as the recording media P. The recording medium P1 is a recording medium P in a normal state in which the medium distance is a standard value, and the recording medium P2 is a recording medium P in a proximity state in which the medium distance is shorter than the recording medium P1.

Light from the recording medium P corresponding to the first light and the second light is incident on the image sensor 5 through the imaging lens 4. In this embodiment, the light from the recording medium P is the reflected light of the first light and the second light by the recording medium P, but the first light and the second light are recorded by the recording medium P. It may be transmitted light. The imaging lens 4 is an imaging optical system that forms an image of light for imaging, and reflected light of the first light by the recording medium P;
The second light is shared by the reflected light from the recording medium P. When the imaging optical system is composed of a plurality of optical components, it is sufficient that at least the imaging lens in the imaging optical system is shared. Further, the magnification of the imaging lens 4 is not particularly limited, but is 1 × here.
The imaging sensor 5 is an imaging unit that captures an image of the surface of the recording medium P using the incident light from the recording medium P and acquires a captured image. The imaging sensor 5 is, for example, a charge-coupled device (CCD) image sensor or a complementary metal-oxide-semiconductor field-effect transistor (CMOS) image sensor.
The imaging sensor 5 has a pixel region 6 in which a plurality of pixels are arranged two-dimensionally. The pixel area 6 includes a first pixel area 6a for detecting the conveyance amount of the recording medium P and a second pixel area 6b for detecting the medium distance. In each configuration of the carry amount sensor 105, reflected light of the first light from the recording medium P is incident on the first pixel area 6a, and reflected light of the second light from the recording medium P is the second pixel area. It arrange | positions so that it may inject into 6b. The first pixel region 6a is preferably larger than the second pixel region 6b. In the present embodiment, the pixel area 6 is 320 pixels × 160 pixels, the first pixel area 6a is 320 pixels × 120 pixels, and the second pixel area 6b is 320 pixels × 40 pixels. Further, the pixel pitch of the pixel region 6 is 10 μm in this embodiment.

Hereinafter, the conveyance detection operation for detecting the conveyance amount by the conveyance amount sensor 105 and the distance detection operation for detecting the medium distance will be described. In the present embodiment, the conveyance detection operation and the distance detection operation are performed at the same time.
FIG. 4 is a diagram for explaining the conveyance detection operation. As shown in FIG. 4, the light 1 a emitted from the light source 1 is converted into parallel light 1 b which is the first light by the collimator lens 3 and is irradiated onto the surface of the recording medium P. The parallel light 1 b is reflected by the recording medium P, and the reflected light 1 c enters the first pixel region 6 a of the image sensor 5 through the imaging lens 4. Since the light incident on the first pixel region 6a is the reflected light 1c of the parallel light 1b, a relatively wide region of the recording medium P is imaged, and the image has features on the surface of the recording medium P. Part 7 is projected. In FIG. 4, a plurality of features 7 are shown. The carry amount can be detected based on the feature portion 7.
FIG. 5 is a diagram for explaining the distance detection operation. As shown in FIG. 5, the spot light 2 a that is the second light emitted from the light source 2 is incident on the surface of the recording medium P. The spot light 2 a is reflected by the recording medium P, and the reflected light 2 b enters the second pixel region 6 b of the image sensor 5 through the imaging lens 4. Since it is the reflected light 2b of the spot light 2a, the light incident on the second pixel area 6b is spot light and forms an image in a narrow area of the recording medium P. The pixel position of the image 8 that is the image formed, that is, the pixel position of the incident spot light (reflected light 2b) varies depending on the medium distance.
For example, if the reflected light 2b from two recording media P1 and P2 with different medium distances is the reflected light 2b1 and 2b2, and the image 8 corresponding to the reflected light 2b1 and 2b2 is the images 8a and 8b, the images 8a and 8b The pixel positions are different from each other. As described above, since the pixel position of the image 8 varies depending on the medium distance, the pixel position of the image 8 indicates the medium distance.
When the spot light 2a is irradiated to the recording medium P at an angle of 45 °, the amount of change in the medium distance and the amount of change in the pixel position of the image 8 can be made the same value. In the present embodiment, the components of the transport amount sensor 105 are arranged so that the amount of change in the medium distance and the amount of change in the pixel position of the image 8 have the same value. In this case, for example, when the medium distance fluctuates by 0.2 mm, the image 8 moves about 0.2 mm. In the present embodiment, in each configuration of the transport amount sensor 105, the reflected light 2b1 from the recording medium P1 whose medium distance is a standard value has a median value (160th pixel) in the longitudinal direction of the second pixel region 6b. It is set to be incident.
Although the image 8 is shown in black in the figure, it is a bright image because it is an image formed by spot light.

FIG. 6 is a block diagram illustrating a configuration of a transport amount detection device that detects the transport amount and corrects it by the medium distance. The configuration shown in FIG. 6 is a functional configuration, and the configuration of each unit may be realized by a storage device such as a ROM or a RAM, a processor such as an MPU, or the like. 2 may be used as a part or all of the storage device, or the MPU 237 of the recording apparatus 100 shown in FIG. 2 may be used as a part or all of the processor. May be used.
A conveyance amount detection apparatus 10 illustrated in FIG. 6 is built in the recording apparatus 100. The carry amount detection apparatus 10 includes a carry amount sensor 105, a control unit 11, a memory management unit 12, an image memory 13, a carry amount detection memory 14, a distance detection memory 15, and a template memory 16. Further, the carry amount detection apparatus 10 includes a pattern matching unit 17, a gravity center position detection unit 18, a distance conversion unit 19, a table storage unit 20, a correction unit 21, and an output unit 22.
FIG. 6 shows the light sources 1 and 2 and the imaging sensor 5 among the components of the carry amount sensor 105. The template memory 16, the pattern matching unit 17, the correction unit 21, and the output unit 22 constitute a conveyance detection unit 50 that detects and corrects the conveyance amount, and the gravity center position detection unit 18, the distance conversion unit 19, and the table storage unit 20 include The distance detector 60 for detecting the medium distance is configured.
The control unit 11 has a timer (not shown) that starts every predetermined reference period (for example, 1 msec), drives the image sensor 5 every time the timer is started, and images the image sensor 5. Get an image. Thereby, the imaging sensor 5 acquires a plurality of captured images at a plurality of different timings. At this time, the control part 11 may control the light quantity and lighting time of the light sources 1 and 2 so that the captured image of appropriate brightness may be acquired. For example, the control unit 11 may control the light amount and the lighting time according to the type of the recording medium P, or may control the light amount and the lighting time according to the captured image acquired at the previous timing. .
The memory management unit 12 temporarily stores image data indicating the captured image acquired by the imaging sensor 5 in the image memory 13. The memory management unit 12 stores the portion corresponding to the first pixel area 6 a in the image data stored in the image memory 13 in the transport amount detection memory 14 as the first partial image data. In addition, the memory management unit 12 causes the distance detection memory 15 to store a portion corresponding to the second pixel region 6b in the image data stored in the image memory 13 as second partial image data. Therefore, the first partial image data indicates a first image that is an image corresponding to the first light included in the captured image, and the second partial image data is included in the second light included in the captured image. The 2nd image which is a response image is shown.
The template memory 16 stores reference image data indicating a template that is a reference image for detecting the carry amount.

The pattern matching unit 17 is a detection unit that detects the transport amount of the recording medium P using the first partial image data stored in the transport amount detection memory 14. Specifically, the pattern matching unit 17 detects the carry amount by performing pattern matching between the first partial image data and the reference image data stored in the template memory 16. The pattern matching method is not particularly limited, and examples thereof include SSD (Sum of Squared Difference), SAD (Sum of Abusolute Difference), and ZNCC (Zero-means Normalized Cross-Correlation).
The distance detection unit 60 including the center-of-gravity position detection unit 18, the distance conversion unit 19, and the table storage unit 20 uses the second partial image data stored in the distance detection memory 15 to detect the medium distance. It is.
The center-of-gravity position detection unit 18 detects the pixel position of the spot light (the pixel position of the image 8 shown in FIG. 5) reflected in the second partial image data stored in the distance detection memory 15. At this time, since the spot light is usually reflected over a plurality of pixel positions, the barycentric position detection unit 18 calculates the pixel position of the barycenter of the spot light as the pixel position of the spot light. Hereinafter, the pixel position of the spot light is referred to as a center of gravity position.
The distance conversion unit 19 obtains a correction coefficient for correcting the transport amount detected by the pattern matching unit 17 based on the barycentric position calculated by the barycentric position detecting unit 18.
Specifically, first, the distance conversion unit 19 calculates the medium distance according to the distance between the gravity center position and the reference position. In this embodiment, the reference position is the barycentric position of the spot light from the recording medium P1 in the normal state where the medium distance is a standard value, and is set in the distance conversion unit 19 in advance. In the present embodiment, since the variation amount of the medium distance and the variation amount of the centroid position are the same value, the distance conversion unit 19 adds, for example, the distance between the centroid position and the reference position to the standard value. The medium distance can be calculated. Further, the distance conversion unit 19 may hold a table indicating the correspondence relationship between the gravity center position and the medium distance in advance, and calculate the medium distance using the table.
Subsequently, the distance conversion unit 19 uses the correction coefficient table stored in the table storage unit 20 to determine a correction coefficient from the medium distance. The correction coefficient table is a table showing the correspondence between the medium distance and the correction coefficient. For example, a dedicated jig is used at the time of manufacturing or shipping the recording apparatus 100 in the factory, or at the time of maintenance of the recording apparatus 100 in the market. Created using.

The correction coefficient table is created as follows, for example.
(Procedure 1) The recording medium P is arranged so that the medium distance becomes a standard value, and the recording medium P is moved in the transport direction by a predetermined distance X (here, 20 mm) using a dedicated jig or the like. Then, the carry amount detection device 10 is used to detect the carry amount x and the medium distance d.
(Procedure 2) From the transport amount x detected in Procedure 1, a correction coefficient k is calculated using the relational expression k = X / x (= 20 / x).
(Procedure 3) A record in which the medium distance d detected in the procedure 1 is associated with the correction coefficient k calculated in the procedure 2 is created.
(Procedure 4) While changing the medium distance (for example, changing the medium distance from the standard value of −0.5 mm to +0.5 mm by 0.1 mm in steps), the same processing as in Procedures 1 to 3 is repeated. Then, a plurality of records created in step 3 of each process are created as a correction coefficient table (step 5). The resolution of the correction coefficient table is improved by using a linear interpolation method or the like for the correction coefficient table created in step 4. . Note that step 5 may not be performed.
In the above creation procedure, the center of gravity position of the spot light may be detected as the medium distance in step 1, and information indicating the correspondence between the center of gravity position and the correction coefficient may be created as the correction coefficient table. In this case, the distance conversion unit 19 can directly calculate the correction coefficient from the barycentric position calculated by the barycentric position detecting unit 18 using the correction coefficient table.
FIG. 7 is a diagram illustrating an example of the correction coefficient table. FIG. 7 shows a correction coefficient table 700 created at a factory using a dedicated jig with a predetermined distance X of 25.4 mm (1 inch).
The correction coefficient table 700 shows an actual medium distance 701 that is an actual medium distance, a detected distance 702 that is a detected medium distance, a detected transport amount 703, and a correction coefficient 704. In the actual medium distance 701, the reference value of the medium distance is set to zero. The detection distance 702 indicates the centroid position of the spot light as the medium distance, and the centroid position corresponding to the reference position is set to the median value (160th pixel). The detection distance 702 becomes smaller than the median value when the medium distance becomes longer than the reference value, and becomes larger than the median value when the medium distance becomes shorter and longer than the reference value.
Since the detection distance 702 has a pixel pitch of 10 μm, when the medium distance is +0.2 mm, the detection distance 702 is 160 − (+ 0.2 / 0.01) ≈140. The detection distance 702 is 160 − (− 0.2 / 0.01) ≈160 when the medium distance is −0.2 mm. When the correction coefficient 704 is represented by k and the carry amount 703 is represented by L, the correction coefficient 704 is calculated as k = X / L = 25.4 / L.

Returning to the description of FIG. The correction unit 21 corrects the carry amount detected by the pattern matching unit 17 with the correction coefficient calculated by the distance conversion unit 19. Specifically, the correction unit 21 corrects the correction amount by multiplying the carry amount by a correction coefficient. Accordingly, since the correction coefficient changes according to the medium distance, the correction unit 21 functions as a correction unit that corrects the transport amount based on the medium distance.
The output unit 22 transmits conveyance amount data indicating the conveyance amount corrected by the correction unit 21 to the MPU 237 of the controller 230 illustrated in FIG. 2 as a detection result by the conveyance amount detection device 10.
When the MPU 237 receives the carry amount data, the MPU 237 performs a recording control process according to the carry amount data.
In the recording control process, the MPU 237 adjusts the transport amount of the recording medium P by the transport motor 201 based on the correction value that is the transport amount indicated by the transport amount data. Specifically, the MPU 237 adjusts based on the correction value so that the conveyance amount of the recording medium P by the conveyance motor 201 becomes a specified value. For example, when the correction value is larger than the specified value, the MPU 237 reduces the transport amount of the recording medium P by the transport motor 201 in accordance with the deviation amount that is the difference between the correction value and the specified value. Further, when the correction value is smaller than the specified value, the MPU 237 increases the transport amount of the recording medium P by the transport motor 201 according to the shift amount.
Further, the MPU 237 may perform a process of correcting the recording data included in the logical signal received by the interface unit 205 based on the carry amount data as the recording control process. For example, when the correction value indicated by the carry amount data is larger than a specified value, the MPU 237 corrects the recording data so that the boundary portion of the image recorded in each recording operation is dark. Further, when the correction value is smaller than the specified value, the MPU 327 corrects the recording data so that the boundary portion of the image recorded in each recording operation becomes thin.

Next, the operation of the carry amount detection device 10 will be described.
FIG. 8 is a diagram for explaining an example of the operation of the carry amount detection apparatus 10. In the example of FIG. 8, the imaging sensor 5 periodically images the surface of the recording medium P, and acquires captured images in the order of image a0, image a1, image a2, image a3,. Of these captured images, a portion corresponding to the first pixel region 6a is sequentially stored in the transport amount detection memory 14 as a first partial image, and a portion corresponding to the second pixel region 6b is a second partial image. Are stored in the distance detection memory 15 in order. In the example shown in the figure, the recording medium P shown in the captured image moves from the left side to the right side in the figure as the recording medium P is conveyed.
Processing for detecting and correcting the carry amount is performed as follows.
(Procedure 1) The pattern matching unit 17 creates an image of a pixel area of a predetermined size as a template b0 from the vicinity of the left end corresponding to the upstream side in the transport direction in the first partial image of the first image a0. The pattern matching unit 17 causes the template memory 16 to store the created template b0 and the reference position that is the pixel position of the template b0 in the image a0. The template b0 is a 4 × 4 pixel region in the present embodiment. As the template b0, a characteristic portion due to fibers, wrinkles or scratches on the recording medium P is selected.
(Procedure 2) The pattern matching unit 17 performs pattern matching between the first partial image of the next image a1 and the template b0, and conveys the pixel position of the region having the highest degree of coincidence with the template b0 in the first partial image. The pixel position is specified later. The pattern matching unit 17 detects the carry amount according to the distance between the pixel position after the carry and the reference position. Further, the pattern matching unit 17 creates an image of a pixel area having a predetermined size as a template b1 from the vicinity of the left end of the first partial image of the image a1. Then, the pattern matching unit 17 updates the template and the reference position by storing the created template b1 and the reference position that is the pixel position of the template b1 in the image a1 in the template memory 16.
(Procedure 3) At the same time as the procedure 2, the centroid position detector 18 detects the centroid position of the spot light from the second partial image of the image a1, and the distance converter 19 calculates a correction coefficient from the centroid position.
(Procedure 4) The correction unit 21 corrects the carry amount detected in the procedure 2 with the correction coefficient calculated in the procedure 3, and the output unit 22 outputs carry amount data indicating the carry amount corrected by the correction unit 21. To do.
(Procedure 5) Every time a captured image is acquired, the same procedure as the procedures 1 to 4 is periodically repeated.
With the above procedure, the pattern matching unit 17 detects the carry amount using the first partial images included in each of the plurality of captured images acquired at different timings. Then, the distance detection unit 60 detects the medium distance using the second partial image included in any of the plurality of captured images including the first partial image used by the pattern matching unit 17. More specifically, the distance detection unit 60 detects the medium distance using the second image included in the latest captured image among the plurality of captured images including the first image used by the pattern matching unit 17. To do.
In order to simplify the description, in the example of FIG. 8, each captured image is represented by binary values of black and white, but each captured image is a multi-value image (a grayscale image such as 256 gradations (8 bits)). ), It is possible to obtain transport amount data in the same procedure.

FIG. 9 is a flowchart for explaining the operation of the carry amount detection apparatus 10 of the present embodiment.
First, the control unit 11 turns on the light sources 1 and 2 by interrupt processing for each reference period using a timer set in itself (step S0). Note that the reference period may be determined longer than the exposure time of the image sensor 5 when pipeline processing is performed for imaging and various processes. However, in order to simplify the description of this example, the reference period is determined to be longer than the time taken from when the light sources 1 and 2 are turned on until the output unit 22 outputs the carry amount data.
Thereafter, the control unit 11 drives the imaging sensor 5. The imaging sensor 5 captures a predetermined exposure time, acquires a captured image, and outputs image data indicating the captured image to the memory management unit 12 (step S1). Note that the control unit 11 may adjust the light amounts and lighting times of the light sources 1 and 2 so that the captured image is acquired with an appropriate exposure amount.
The memory management unit 12 temporarily stores the image data output from the imaging sensor 5 in the image memory 13. The memory management unit 12 extracts the first partial image data from the image data stored in the image memory 13 and stores the first partial image data in the carry amount detection memory 14 (step S2). The second partial image data is extracted from the image data. Extracted and stored in the distance detection memory 15 (step S3).
The process of extracting the first partial image data from the image data is a process of cutting out a part corresponding to the first pixel area 6a from the image data or a part corresponding to the second pixel area 6b in the image data. Is a process of applying a mask to The process of extracting the second partial image data from the image data is a process of cutting out a part corresponding to the second pixel area 6b from the image data, or masking a part corresponding to the first pixel area 6a in the image data. It is a process to apply.
When the second partial image data is stored in the distance detection memory 15, the barycentric position detector 18 detects the barycentric position of the spot light reflected in the second partial image data (step S4). At this time, the barycentric position detector 18 may increase the resolution by detecting the barycentric position in units of subpixels.

The distance conversion unit 19 calculates the medium distance from the centroid position detected by the centroid position detection unit 18 (step S5). The distance conversion unit 19 obtains the difference between the medium distance calculated in step S5 and the previously calculated medium distance as a change amount of the medium distance, and determines whether the change amount is equal to or greater than a predetermined threshold (step S6). ). Note that in the case of immediately after the start of startup (first cycle), that is, when the previously calculated medium distance does not exist, the distance conversion unit 19 may determine that the amount of change is less than the threshold, and the previous medium distance is used as a reference. The amount of change may be calculated as a value.
When the amount of change is less than the threshold, the distance conversion unit 19 calculates a correction coefficient from the medium distance using the correction coefficient table stored in the table storage unit 20 (step S7).
On the other hand, when the amount of change is equal to or greater than the threshold, the distance conversion unit 19 determines that the medium distance is an abnormal value and performs error processing (step S8). In this embodiment, the error processing calculates the media distance as a media distance detected in the past (for example, the media distance detected last time) or a predetermined media distance, and a correction coefficient corresponding to the media distance is calculated. This is a calculation process. The error processing may be processing that interrupts this operation.
When the first partial image is stored in the carry amount detection memory 14 in step S2, the pattern matching unit 17 determines whether or not it is immediately after starting (step S9).
Immediately after the start of activation, the pattern matching unit 17 calculates the transport amount as 0 because the recording medium P is not transported (step S10). Then, the pattern matching unit 17 extracts a template from the first partial image data stored in the carry amount detection memory 14. The pattern matching unit 17 stores the reference image data indicating the template and the reference position that is the pixel position of the template in the template memory 16 (step S11).
If not immediately after the start of activation, the pattern matching unit 17 performs pattern matching between the first partial image data stored in the carry amount detection memory 14 and the reference image data stored in the template memory 16. The pattern matching unit 17 specifies the pixel position of the template in the first partial image as the pixel position after conveyance by the pattern matching (step S12). The pattern matching unit 17 calculates the carry amount based on the difference between the post-carry pixel position and the reference position stored in the template memory 16 (step S13). At this time, the pattern matching unit 17 may increase the resolution by calculating the transport amount in units of subpixels.

The pattern matching unit 17 updates the template and the reference position based on the first partial image stored in the carry amount detection memory 14. Specifically, the pattern matching unit 17 extracts a template from the first partial image data stored in the carry amount detection memory 14. The pattern matching unit 17 stores the reference image data indicating the template and the reference position which is the pixel position of the template in the template memory 16 (step S14).
The correction unit 21 corrects the conveyance amount by multiplying the conveyance amount calculated by the pattern matching unit 17 in step S10 or S13 by the correction coefficient calculated by the distance conversion unit 19 in step S7 or S8. (Step S15). If the carry amount is calculated to be 0 in step S10, the carry amount value does not change even if the carry amount is multiplied by the correction coefficient, and therefore the process of step S15 may be skipped.
Thereafter, the output unit 22 transmits conveyance amount data indicating the conveyance amount corrected by the correction unit 21 to the MPU 237 of the controller 230 illustrated in FIG. 2 (step S16), and ends the processing. When the MPU 237 receives the carry amount data, the MPU 237 performs a recording control process according to the carry amount data.
The operation described with reference to FIG. 9 is merely an example, and the operation of the carry amount detection apparatus 10 is not limited to the example of FIG. For example, in the example of FIG. 9, series processing in which imaging processing by the imaging sensor 5 and subsequent calculation output processing are sequentially performed is used. However, a pipe that performs imaging processing and calculation output processing in parallel is used. Line processing may be used.

As described above, according to the present embodiment, the light sources 1 and 2 and the collimating lens 3 irradiate the recording medium P being conveyed with the first and second lights. The imaging sensor 5 captures the recording medium P using the light from the recording medium P corresponding to the first and second lights and acquires a captured image. The pattern matching unit 17 detects the transport amount of the recording medium P using the first partial image corresponding to the first light included in the captured image. The distance detection unit 60 detects the medium distance between the imaging unit and the recording medium using the second image corresponding to the second light included in the captured image. The correction unit 21 corrects the carry amount based on the medium distance.
Therefore, the conveyance amount detected using the first partial image corresponding to the first light is corrected based on the medium distance detected using the second partial image corresponding to the second light. . Accordingly, the transport amount of the recording medium P can be corrected based on the medium distance without using a plurality of imaging optical systems, and thus the recording medium can be suppressed while suppressing an increase in size and cost. It becomes possible to accurately detect the transport amount of P.
In the present embodiment, the imaging sensor 5 includes the first pixel region 6a on which light from the recording medium P corresponding to the first light is incident, and the recording medium P corresponding to the second light. And a second pixel region 6b on which light is incident. The first partial image is an image corresponding to the first pixel area in the captured image, and the second partial image is an image corresponding to the second pixel area in the captured image. Therefore, the first partial image and the second partial image can be separated with high accuracy, and the transport amount of the recording medium P can be detected with high accuracy.
In the present embodiment, the pattern matching unit 17 detects the carry amount using the first partial images included in each of the plurality of captured images acquired at different timings. Then, the distance detection unit 60 detects the medium distance using the second partial image included in any of the plurality of captured images including the first partial image used by the pattern matching unit 17. Therefore, since it is possible to detect the medium distance for correcting the carry amount using the captured image used to detect the carry amount, the carry amount of the recording medium P is accurately detected. It becomes possible.
Moreover, in this embodiment, the control part 11 controls the light quantity and irradiation time of 1st and 2nd light separately. For this reason, since it becomes possible to obtain a captured image with appropriate brightness, it is possible to accurately detect the transport amount of the recording medium P.
In the present embodiment, the memory management unit 12a extracts the first partial image and the second partial image from the captured image. The pattern matching unit 17 uses the first partial image extracted by the memory management unit 12, and the distance detection unit 60 uses the second partial image extracted by the memory management unit 12. Therefore, the first partial image and the second partial image can be separated with high accuracy, and the transport amount of the recording medium P can be detected with high accuracy.
In the present embodiment, the distance detection unit 60 obtains a change amount of the medium distance, and when the change amount is equal to or greater than a threshold value, determines that an abnormality has occurred and performs error processing. For this reason, even if an abnormality occurs in the detection of the medium distance, it is possible to perform appropriate error processing.
Further, the error processing of the present embodiment includes processing for setting the medium distance to a medium distance detected in the past or a predetermined medium distance. In this case, since the carry amount can be corrected even if an abnormality occurs, the carry amount of the recording medium P can be accurately detected.
In the present embodiment, the imaging lens 4 is shared by the light from the recording medium corresponding to the first light and the light from the recording medium corresponding to the second light. For this reason, since it is not necessary to provide a plurality of imaging lenses 4, it is possible to suppress an increase in size and cost.

(Second Embodiment)
In the first embodiment, the conveyance detection process for detecting the conveyance amount and the distance detection process for detecting the medium distance are performed simultaneously. In the present embodiment, an example in which the conveyance detection process and the distance detection process are alternately performed in a time division manner will be described. FIG. 10 is a block diagram illustrating the configuration of the conveyance amount detection apparatus according to the present embodiment. The carry amount detection device 10a illustrated in FIG. 10 includes a carry amount sensor 105, a control unit 11a, a memory management unit 12a, an image memory 13, and a cutout memory 14a. Further, the carry amount detection apparatus 10 includes a pattern matching unit 17, a gravity center position detection unit 18, a distance conversion unit 19, a table storage unit 20, a correction unit 21, and an output unit 22. Further, the carry amount detection device 10 includes a NOT circuit 31 and a latch unit 32.
The template memory 16, the pattern matching unit 17, the correction unit 21, and the output unit 22 constitute a conveyance detection unit 50a that detects the conveyance amount. The center-of-gravity position detection unit 18, the distance conversion unit 19, the table storage unit 20, and the latch unit 32 constitute a distance detection unit 60a that detects the medium distance.
In addition to the function of the control unit 11 illustrated in FIG. 6, the control unit 11 a includes a frame counter that counts the number of times the timer is started, that is, a cycle (frame) number each time the timer is started. The counter value of the frame counter starts from 0.
The control unit 11a causes the distance detection unit 60a to execute distance detection processing when the counter value of the frame counter is an even number, and causes the conveyance detection unit 50a to execute conveyance detection processing when the counter value is an odd number. In the present embodiment, a signal indicating even / odd counter value is input to the transport detection unit 50a as an enable signal, and an inverted enable signal obtained by inverting the enable signal by the NOT circuit 31 is input to the distance detection unit 60a. Further, the control unit 11a turns on the enable signal when the counter value is odd, and turns off the enable signal when the counter value is even. Thereby, when the counter value is an even number, the distance detection unit 60a executes the distance detection process, and when the counter value is an odd number, the conveyance detection unit 50a executes the conveyance detection process.
The memory management unit 12 a temporarily stores image data indicating the captured image acquired by the imaging sensor 5 in the image memory 13. When the counter value of the frame counter of the control unit 11a is an even number, the memory management unit 12 extracts the second partial image data from the image data stored in the image memory 13 and stores it in the cut-out memory 14a. In addition, when the counter value is an odd number, the memory management unit 12 extracts the first partial image data from the image data stored in the image memory 13 and stores the first partial image data in the cut-out memory 14a.
The latch unit 32 latches (saves) the coefficient information indicating the correction coefficient calculated by the distance conversion unit 19.
The correction unit 21 corrects the carry amount detected by the pattern matching unit 17 with the correction coefficient latched by the latch unit 32.
With the above configuration, in the present embodiment, the distance detection unit 60a extracts the second partial image included in the captured image acquired at a timing different from the captured image including the first partial image used by the pattern matching unit 17. The medium distance is calculated using this. In particular, in the present embodiment, the conveyance detection process and the distance detection process are executed alternately. For this reason, the distance detection unit 60a calculates the medium distance by using the second partial image included in the captured image acquired at the timing closest to the captured image including the first partial image used by the pattern matching unit 17. Will be calculated.

FIG. 11 is a flowchart for explaining the operation of the carry amount detection apparatus 10a of this embodiment.
First, when the timer set in itself is started, the control unit 11a checks the counter value of the frame counter and determines whether or not the counter value is an even number (step S20). Note that the initial value of the counter value is set to zero.
When the counter value is an even number, the control unit 11a outputs an enable signal indicating OFF, further turns off the light source 1, and turns on the light source 2. The output enable signal is inverted by the NOT circuit 31 and input to the distance detection unit 60a as an inverted enable signal indicating ON. Thereby, the distance detection part 60a drives (step S21).
Then, the control unit 11a drives the imaging sensor 5. The imaging sensor 5 captures a predetermined exposure time, acquires a captured image, and outputs image data indicating the captured image to the memory management unit 12a (step S1a).
The memory management unit 12 a temporarily stores the image data output from the imaging sensor 5 in the image memory 13. The memory management unit 12a extracts the second partial image data from the image data stored in the image memory 13 and stores it in the cutout memory 14a (step S3a).
Thereafter, processing equivalent to steps S4 to S8 in FIG. 9 is executed. At this time, the distance detection memory 15 is replaced with the cutout memory 14a in steps S4 to S8.
When the process of step S8 ends, the latch unit 32 latches coefficient information indicating the correction coefficient calculated by the distance conversion unit 19 in step S7 or S8 (step S22).

When the counter value is an odd number, the control unit 11a outputs an enable signal indicating ON, further turns on the light source 1, and turns off the light source 2. The output enable signal is input to the conveyance detection unit 50a. Thereby, the conveyance detection unit 50a is driven (step S23).
Then, the control unit 11a drives the imaging sensor 5. The imaging sensor 5 performs imaging for a predetermined exposure time, acquires a captured image, and outputs image data indicating the captured image to the memory management unit 12a (step S1b).
The memory management unit 12 a temporarily stores the image data output from the imaging sensor 5 in the image memory 13. The memory management unit 12a extracts the first partial image data from the image data stored in the image memory 13 and stores it in the cutout memory 14a (step S3b).
Thereafter, processing equivalent to steps S9 to S14 in FIG. 9 is executed. At this time, the distance detection memory 15 is replaced with the cutout memory 14a in steps S4 to S8.
When the process of step S14 ends, the correction unit 21 corrects the carry amount calculated by the pattern matching unit 17 in step S10 or S13. Specifically, the correction unit 21 corrects the carry amount by multiplying the carry amount by a correction coefficient indicated by the coefficient information latched by the latch unit 32 in Step S22 (Step S15a).
Thereafter, the output unit 22 transmits transport amount data indicating the transport amount corrected by the correction unit 21 to the MPU 237 of the controller 230 illustrated in FIG. 2 (step S16). Then, the control unit 11a updates (increments) the counter value of the frame counter (step S23) and ends the process.

The operation described with reference to FIG. 11 is merely an example, and the operation of the carry amount detection device 10a is not limited to the example of FIG. For example, the frame counter included in the control unit 11a may be realized by software. In the above example, the distance detection process and the conveyance detection process are performed at the same frequency because the distance detection process or the conveyance detection process is performed according to whether the counter value is an even number or an odd number. However, the frequency with which the distance detection process and the conveyance detection process are performed may be different. For example, the control unit 11a may cause the distance detection process to be executed by the distance detection unit 60a when the counter value is a multiple of 3, and may cause the conveyance detection unit 50a to execute the conveyance detection process when the counter value is not a multiple of 3. Good.
In the above example, the reference period measured by the timer of the control unit 11 is determined to be longer than the longer processing time of the distance detection process and the conveyance detection process. However, the reference period may be different depending on whether the currently executed process is a distance detection process or a conveyance detection process. Specifically, since the distance detection process ends in a shorter time than the conveyance detection process, if the currently executing process is a distance detection process, the reference period is shortened, and the currently executing process is a conveyance detection process. The reference period may be lengthened.
In the present embodiment, since the imaging is performed at different timings in the distance detection process and the conveyance detection process, the pixel area 6a and the pixel area 6b in the imaging sensor 5 may not be separated.

As described above, also in the present embodiment, the carry amount detected using the first partial image corresponding to the first light is detected using the second partial image corresponding to the second light. Correction is made based on the medium distance. For this reason, it is possible to accurately detect the transport amount of the recording medium P while suppressing an increase in size and cost.
In the present embodiment, the distance detection unit 60a uses the second partial image included in the captured image acquired at a timing different from the captured image including the first partial image used by the pattern matching unit 17. Calculate the media distance. For this reason, it is not necessary to perform the process for detecting the carry amount and the process for detecting the medium distance at the same time. Accordingly, it is possible to share at least a part of a storage device, a processor, and the like for realizing the conveyance detection unit 50a and the distance detection unit 60a, thereby suppressing an increase in size and cost. Become.

In each embodiment described above, the illustrated configuration is merely an example, and the present invention is not limited to the configuration.
For example, in addition to the configuration illustrated in FIG. 2, the recording apparatus 100 may include a display unit that includes a liquid crystal display (LCD) or a light emitting diode (LED) as a user interface.
Further, although the pixel region 6 of one image sensor 5 is divided into the first pixel region 6a and the second pixel region 6b, the pixel region 6 includes the first pixel region 6a and the second pixel region 6b. Two imaging sensors 5 may be used. In this case, compared with the case where the image sensor 5 is configured, the pixel area of the two image sensors 5 can be made inexpensively.

1, 2 Light source (irradiation means)
3 Collimating lens (irradiation means)
4 Imaging lens (imaging optical system)
5 Imaging sensor (imaging means)
10, 10a Conveyance amount detection device 17 Pattern matching unit (detection means)
21 Correction part (correction means)
60, 60a Distance detection unit (distance detection means)
100 recording device

Claims (16)

Irradiating means for irradiating the recording medium being conveyed with the first and second lights;
An imaging unit that captures an image of the recording medium by using light from the recording medium corresponding to the first and second light irradiated by the irradiation unit;
Detecting means for detecting a conveyance amount of the recording medium using a first image corresponding to the first light included in the captured image;
A distance detection unit that detects a distance between the imaging unit and the recording medium using a second image corresponding to the second light included in the captured image;
And a correction unit that corrects the conveyance amount based on the distance. The imaging means includes a first pixel region where light from the recording medium corresponding to the first light is incident, and a second pixel where light from the recording medium corresponding to the second light is incident. And a pixel area of
The first image is a partial image corresponding to the first pixel region in the captured image, and the second image is a partial image corresponding to the second pixel region in the captured image. The conveyance amount detection device according to claim 1, wherein the conveyance amount detection device is a device.   The transport amount detection device according to claim 1, wherein an irradiation area of the second light on the recording medium is smaller than an irradiation area of the first light on the recording medium. The imaging means acquires a plurality of the captured images at different timings,
The detection means detects the transport amount using a first image included in each of the plurality of captured images,
The distance detecting unit detects the distance by using a second image included in any of a plurality of captured images including the first image used by the detecting unit. The conveyance amount detection device according to any one of 3.   5. The transport amount according to claim 4, wherein the distance detection unit uses a second image included in a latest captured image among a plurality of captured images including the first image used by the detection unit. Detection device. The imaging means acquires a plurality of the captured images at different timings,
The detection means detects the transport amount using a first image included in each of the plurality of captured images,
The distance detection unit calculates the distance using a second image included in a captured image acquired at a timing different from a plurality of captured images including the first image used by the detection unit. The conveyance amount detection device according to claim 1, wherein the conveyance amount detection device is a feature.   The distance detection unit uses a second image included in a captured image acquired at a timing closest to the latest captured image among a plurality of captured images including the first image used by the detection unit. The conveyance amount detection device according to claim 6, wherein   The transport amount detection device according to claim 1, further comprising a control unit that individually controls a light amount and an irradiation time of the first light and the second light. An extraction means for extracting the first image and the second image from the captured image;
The detection means uses the first image extracted by the extraction means,
The transport amount detection device according to claim 1, wherein the distance detection unit uses the second image extracted by the extraction unit.   10. The distance detection unit according to claim 1, wherein the distance detection unit obtains a change amount of the distance, and performs error processing by determining that an abnormality has occurred when the change amount is equal to or greater than a threshold value. The conveyance amount detection apparatus described in 1.   The transport amount detection apparatus according to claim 10, wherein the error process includes a process of setting the distance to a distance detected in the past or a predetermined distance. An imaging optical system for imaging light from the recording medium on the imaging means;
The imaging optical system is shared by the light from the recording medium corresponding to the first light and the light from the recording medium corresponding to the second light. Item 12. The conveyance amount detection device according to any one of Items 1 to 11.   The said irradiation means contains the 1st irradiation means which irradiates said 1st light, and the 2nd irradiation means which irradiates said 2nd light, The any one of Claim 1 thru | or 12 characterized by the above-mentioned. The conveyance amount detection device according to item.   14. The light according to claim 1, wherein light from the recording medium corresponding to the first and second lights is reflected light of the first and second lights from the recording medium. The conveyance amount detection device described. The conveyance amount detection device according to any one of claims 1 to 14,
Conveying means for conveying the recording medium;
And a recording control unit configured to adjust a conveyance amount of the recording medium by the conveyance unit based on the conveyance amount corrected by the conveyance amount detection device. The conveyance amount detection device according to any one of claims 1 to 14,
Conveying means for conveying the recording medium;
Recording means for recording on the recording medium based on recording data;
A recording apparatus comprising: a recording control unit that corrects the recording data based on the conveyance amount corrected by the conveyance amount detection device.

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