JP6896013B2 - Image reader - Google Patents

Description

The present invention relates to an image reading device including a reading unit that reads an image of a document conveyed by the conveying unit.

Patent Document 1 describes an example of an image reading device that transports a document set in a set unit to a predetermined reading position and reads an image of the document transported to the same scanning position by the scanning unit.

By the way, when transporting a color document, a transport defect such as a paper jam is more likely to occur than when transporting a monochrome document. Therefore, in the image reading device described in Patent Document 1, when reading an image of a color document, the document is conveyed at a lower speed than when reading an image of a monochrome document. Specifically, in the control device of the image reading device, when information based on the user operation is input, it is determined whether to read the image of the color original or the image of the monochrome original. Then, when scanning the image of the monochrome document, the normal transport mode is selected, and when scanning the image of the color document, the transport mode for slower transport than the normal transport mode is selected. The transport unit is operated in the transport mode selected in this way.

Japanese Unexamined Patent Publication No. 2003-128298

By the way, the image reading device may read images of various originals having different thicknesses. When transporting a thin document, transport defects such as paper jams are more likely to occur than when transporting a thick document. Therefore, when reading an image of a thin original, it is desirable to convey the original at a lower speed than when reading an image of a thick original.

However, in an image reading device that causes a reading unit to read an image of a document conveyed by the conveying unit, there is generally a correlation between the conveying speed of the document and the resolution of the acquired image. Specifically, the lower the transport speed of the document, the higher the resolution of the image data, that is, the image data is generated. Therefore, when the transport speed of the document is changed according to the thickness of the document, the generated image data is not necessarily the image data of the resolution desired by the user.

An object of the present invention is to provide an image reading device capable of generating image data having a resolution desired by a user even when the transport speed of a document is variable.

The image reading device for achieving the above object is a transporting unit for transporting a document, a scanning unit for reading an image of a document transported by the transporting unit, and an image data which is image data read by the scanning unit. In an image reading device including a control unit for generating, the reading unit reads an image of the original at predetermined timings when the original is conveyed by the conveying unit, and is specific. The operation of reading an image from a document when the setting information is not input to the control unit is set as the first scanning mode, and the operation of reading an image from the document when the specific setting information is input to the control unit. Is set to the second scanning mode, in the first scanning mode, the control unit reads an image from the document conveyed by the conveying unit into the reading unit at a speed corresponding to the required resolution. The image data of the image read by the scanning unit is generated, and in the second scanning mode, the image is read from the document conveyed by the conveying unit at a lower speed than in the case of the first scanning mode. By delaying the timing from the case of the first reading mode while causing the unit to read, the image data of the image having the same resolution as that of the first reading mode is generated. When the control unit starts reading an image based on the next job in a situation where the second reading mode is selected, the reading mode to be executed is changed from the second reading mode to the first reading mode. Switch to read mode.

According to the above configuration, when the reading of the image is instructed in the situation where the specific setting information is not input to the control unit, the first reading mode is executed. That is, when the user recognizes that the thickness of the document is not thin, the user instructs the image reading device to read the image without performing the user operation such that the specific setting information is input to the control unit. Will be done. At this time, the resolution of the image based on the generated image data can be selected by the user when the user inputs a reading instruction. Therefore, the document is conveyed at a transfer speed that correlates with the resolution requested by the user, and image data of the resolution requested by the user is generated. Therefore, it is possible to provide the user with image data having a resolution desired by the user.

On the other hand, when the reading of the image is instructed in the situation where the specific setting information is input to the control unit, the second reading mode is executed. That is, when the user recognizes that the thickness of the document is thin, the user instructs the image reading device to read the image after performing the user operation such that the specific setting information is input to the control unit. Will be done. At this time, although the original is conveyed at a lower speed than in the first scanning mode, image data of an image having the same resolution as in the first scanning mode is generated. That is, it is possible to provide the user with image data that does not depend on the transport speed of the original while suppressing transport defects such as paper jams. Therefore, even when the transport speed of the original is variable, it becomes possible to generate image data having a resolution desired by the user.

In the image reading device, when the control unit continuously reads images of a plurality of documents, the specific setting information is input while the transport unit is transporting one of the originals. If so, it is preferable to switch the scanning mode to be performed from the first scanning mode to the second scanning mode at the start of scanning the image of the next document of the one document.

According to the above configuration, when reading images of a plurality of originals in succession, if the specific setting information is input to the control unit while one of the originals is being conveyed, one original is used. The first reading mode is continued until the reading of the image of is completed. That is, the scanning mode is not changed during the transfer of one document, and the transfer speed of the same document is not changed. Therefore, it is possible to suppress an increase in the control load due to switching of the reading mode during image reading.

After that, when scanning the image of the next original, the second scanning mode is executed instead of the first scanning mode. That is, when scanning the images of the originals after the first original, the originals are conveyed at a low speed. Moreover, since the second scanning mode is used, even if the document is conveyed at a low speed, image data having the same resolution as that in the first scanning mode is generated. Therefore, when scanning the images of the originals after the first original, the originals are conveyed at a low speed to suppress the occurrence of transfer defects of the originals, and at the same time, the image data that does not depend on the transfer speed is provided to the user. It becomes possible.

Further, the image reading device for achieving the above object is a transport unit for transporting a document, a scanning unit for reading an image of a document transported by the transport unit, and an image which is image data read by the scanning unit. In an image reading device including a control unit for generating data, when the thickness of the document conveyed by the conveying unit is not thin, the operation of reading an image from the original is set as the first reading mode, and the conveying is performed. When the operation of reading an image from the original when the thickness of the document conveyed by the unit is thin is set to the second scanning mode, the control unit achieves the required resolution in the first scanning mode. An image is read by the reading unit from a document conveyed by the conveying unit at a corresponding speed, image data of the image read by the reading unit is generated, and in the second reading mode, the first reading is performed. While causing the reading unit to read an image from the document conveyed by the conveying unit at a lower speed than in the mode, image data of an image having the same resolution as in the first reading mode is generated. In addition, "when the thickness of the original is not thin" means that the thickness of the original is not thinner than the specified thickness, and "when the thickness of the original is thin" means that the thickness of the original is less than the specified thickness. This is the case when it is thin.

According to the above configuration, when the thickness of the document conveyed by the conveying unit is not thin, the first scanning mode is implemented. When the user instructs the image reading device to read the image of the original, the resolution of the image based on the generated image data can be selected by the user. Therefore, it is possible to provide the user with image data having a resolution desired by the user.

On the other hand, when the thickness of the document conveyed by the conveying unit is thin, the second scanning mode is implemented. In this case, the original is conveyed at a lower speed than in the first scanning mode, but image data having the same resolution as in the first scanning mode is generated. That is, it is possible to provide the user with image data that does not depend on the transport speed of the original while suppressing transport defects such as paper jams. Therefore, even when the transport speed of the original is variable, it becomes possible to generate image data having a resolution desired by the user.

The image reading device includes a sound wave sensor that outputs a sound wave to the document conveyed by the conveying unit and detects the attenuation rate of the sound wave, and the control unit conveys the document by the conveying unit. When the attenuation rate of the sound wave detected by the sound wave sensor is less than the determination attenuation rate under such circumstances, it is determined that the thickness of the document conveyed by the transfer unit is thin, and the second reading mode is performed. Is preferable.

The thinner the original, the smaller the attenuation rate of the sound wave detected by the sound wave sensor. Therefore, in the above configuration, when the attenuation rate of the sound wave detected by the sound wave sensor is less than the determination attenuation rate, it can be determined that the thickness of the conveyed document is thin, so the second reading mode is performed. I am trying to do it. By using the detection result by the sound wave sensor in this way, the second reading mode can be automatically selected and executed.

In the image reading device, the sound wave sensor is a sensor that detects whether or not a plurality of original documents are conveyed in an overlapping state, and is used to determine whether or not a plurality of original documents are conveyed in an overlapping state. As the threshold value of, a double feed detection attenuation rate larger than the determination attenuation rate is provided, and the control unit determines the attenuation rate of the sound wave detected by the sound wave sensor under the condition that the document is conveyed by the transfer unit. When it is equal to or higher than the determination attenuation factor and less than the double feed detection attenuation factor, the first reading mode is performed, and the sound wave detected by the sound wave sensor under the condition that the document is conveyed by the transfer unit. When the attenuation rate of is equal to or higher than the double feed detection attenuation rate, it is preferable to stop the transfer of the document by the transfer unit and the reading of the image by the reading unit.

When a plurality of original documents are conveyed in an overlapping state, the attenuation rate of the sound wave detected by the sound wave sensor tends to be larger than that when only one original document is conveyed. The sound wave attenuation rate when two thin documents are overlapped is larger than the sound wave attenuation rate when one non-thick document is conveyed. Therefore, according to the above configuration, the double feed detection attenuation factor, which is a threshold value for determining whether or not a plurality of documents are conveyed in an overlapping state, is determined to be a value larger than the determination attenuation factor. Then, by using this double feed detection attenuation factor, it is possible to determine whether one original document having a thin thickness is being conveyed or whether a plurality of original documents are being conveyed in an overlapping state. Then, by adopting such a discrimination result, it becomes possible to drive the image reading device appropriately according to the situation.

In the image reading device, the transport unit is arranged on a transport roller pair located upstream of the scanning unit in the transport direction of the document and on the upstream side of the transport roller pair in the transport direction of the document, and transports the document. It has a feeding roller that feeds toward the roller pair, and the sound wave sensor is preferably arranged between the feeding roller and the transport roller pair in the transport direction of the document.

According to the above configuration, it is possible to determine whether or not the thickness of the conveyed document is thin on the upstream side in the conveying direction from the reading unit.
In the image reading device, the control unit sets the reading mode to be executed from the second reading mode to the first reading mode when a predetermined end condition is satisfied under the condition that the second reading mode is selected. It is preferable to switch to the reading mode of.

According to the above configuration, when it is no longer necessary to carry out the second reading mode, the mode can be switched from the second reading mode to the first reading mode.
In the image reading device, the control unit reads the next image when the setting information to end the second reading mode is input while the second reading mode is selected. It is preferable to switch the reading mode sometimes performed from the second reading mode to the first reading mode.

According to the above configuration, when the setting information that the execution of the second reading mode is unnecessary is input, the first reading mode can be executed when the next image is read.
In the image reading device, when the control unit starts reading an image based on the next job in a situation where the second reading mode is selected, the second reading mode is executed. It is preferable to switch from the reading mode to the first reading mode.

According to the above configuration, when the image is read based on the next job, the first reading mode can be automatically executed.

The perspective view which shows the schematic structure of the 1st Embodiment of an image reader. The side view which shows the transport device of the image reader and the peripheral member thereof. A table for explaining a plurality of first read modes. The block diagram explaining the functional structure of the image reader. The flowchart explaining the processing procedure at the time of reading an image by the image reading apparatus. The flowchart explaining the processing procedure at the time of reading an image by the image reading apparatus of 2nd Embodiment. The block diagram explaining the functional structure of the image reading apparatus of 3rd Embodiment. The flowchart explaining the processing procedure at the time of reading an image by the image reading apparatus.

(First Embodiment)
Hereinafter, the first embodiment in which the image reading device is embodied will be described with reference to FIGS. 1 to 5.
As shown in FIG. 1, the image reading device 11 of the present embodiment includes a housing 12 and a cover member 13 rotatably supported by the housing 12. The cover member 13 is provided with a user interface 50 of the present device. That is, the user interface 50 has a plurality of buttons 51 and a plurality of lamps 52.

One of the buttons 51 is a identification button 51A that is operated when instructing the execution of image reading in the second reading mode described later. Further, one of the lamps 52 is a specific lamp 52A that is lit when the specific button 51A is in the ON state. The specific lamp 52A is turned off when the specific button 51A is in the off state.

Further, as shown in FIG. 2, the image reading device 11 is provided with a setting unit 14 in which a document MS for which an image has not yet been read is set. When a plurality of document MSs are set in the set unit 14, the document MSs are stacked on the set unit 14. Further, inside the housing 12, a transport device 20 as a transport unit for transporting the document MS and a reading device 30 for reading an image of the document MS transported by the transport device 20 are provided. Then, the document MSs set in the set unit 14 enter the housing 12 one by one and are transported along a predetermined transport path. Then, the image of the original MS is read while being conveyed, and the original MS for which the image reading is completed is discharged to the outside of the housing 12.

As shown in FIG. 2, the transport device 20 includes a feed roller 21, a feed roller pair 22, a transport roller pair 23, and a discharge roller pair 24, which are arranged in order from upstream to downstream in the transport direction of the document MS. There is. Further, the transfer device 20 includes a transmission motor 25 and a transfer motor 26 as a drive source for transporting the document MS. The driving force from the sending motor 25 is transmitted to the feed roller 21, and the driving force from the transport motor 26 is transmitted to the feed roller vs. 22, the transport roller vs. 23, and the discharge roller vs. 24.

The feed roller 21 feeds the lowest-ranked document MS among the plurality of document MSs set in the set unit 14 into the housing 12. Further, the guide member 27 is arranged above the feed roller 21. The guide member 27 restricts the entry of documents other than the lowest document MS into the housing 12.

The delivery roller pair 22 has a drive roller 221 that is driven and connected to the transfer motor 26, and a driven roller 222 that transmits the driving force from the transfer motor 26 through the drive roller 221. Then, as the drive roller 221 and the driven roller 222 rotate, the document MS is sandwiched between the rollers 221, 222, and the document MS is sent out toward the transport roller pair 23.

The driven roller 222 of the feeding roller vs. 22 is a retard roller to which a constant rotational load is applied by a torque limiting mechanism such as a torque limiter. Therefore, when a plurality of document MSs are fed into the housing 12 from the set unit 14 in an overlapping state, only one document MS is fed downstream in the transport direction by the delivery roller pair 22. In this respect, the two rollers 221 and 222 constituting the feeding roller pair 22 function as "feeding rollers" that feed the document MS toward the transport roller pair 23.

The transport roller pair 23 is arranged upstream of the reader 30 in the transport direction on the right side in the drawing. Such a transfer roller pair 23 has a drive roller 231 that is driven and connected to the transfer motor 26, and a driven roller 232 in which the driving force from the transfer motor 26 is transmitted through the drive roller 231. Then, as the drive roller 231 and the driven roller 232 rotate, the document MS is sandwiched between the rollers 231 and 232, and the document MS is conveyed toward the reading device 30.

The discharge roller pair 24 is arranged downstream of the reading device 30 on the left side in the drawing in the transport direction. Such a discharge roller pair 24 has a drive roller 241 that is driven and connected to the transfer motor 26, and a driven roller 242 that transmits the driving force from the transfer motor 26 through the drive roller 241. Then, as the drive roller 241 and the driven roller 242 rotate, the document MS is sandwiched between the rollers 241, 242, and the document MS is discharged to the outside of the housing 12.

The reading device 30 has two reading units 31 and 32 arranged on both upper and lower sides of the original MS that is conveyed along the conveying path. Of the reading units 31 and 32, the reading unit located on the lower side is the first reading unit 31, and the reading unit located on the upper side is the second reading unit 32. That is, the first reading unit 31 reads the image on one side (lower surface in the drawing) of the document MS, and the second reading unit 32 reads the image on the other side (upper surface in the drawing) of the document MS. As the reading unit, for example, a contact image sensor module (CISM) can be mentioned. Of course, a module other than CISM may be adopted as the reading unit.

As shown in FIG. 2, an end detection sensor 600 for detecting the end of the original MS is provided between the reading device 30 and the conveying roller pair 23 in the conveying direction of the original MS.
Further, a double feed detection sensor 610 is provided between the feed roller pair 22 and the transport roller pair 23 in the transport direction of the document MS to detect that a plurality of document MSs are being transported in an overlapping state. ing. The double feed detection sensor 610 is a sound wave sensor, and has an output unit 611 for outputting sound waves and an input unit 612 for inputting sound waves output from the output unit 611. Then, one of the output unit 611 and the input unit 612 is arranged above the document MS transported along the transport path in the drawing, and outputs below the document MS transported along the transport path. The other of the unit 611 and the input unit 612 is arranged. In the example shown in FIG. 2, the input unit 612 is arranged in the upper part of the figure, and the output unit 611 is arranged in the lower part of the figure.

Then, the double feed detection sensor 610 detects the attenuation factor α of the sound wave. When the output value of the sound wave output from the output unit 611 is "X1" and the input value of the sound wave input to the input unit 612 is "X2", the attenuation factor α is the relational expression (Equation 1) shown below. It is a value that can be calculated using.

α = (X1-X2) / X1 ... (Equation 1)
By the way, in the image reading device 11 of the present embodiment, the user can select the resolution of the image based on the image data output from the device. That is, the first reading mode, which is an example of the image reading mode, can be selected by the operation of the user interface 50 by the user or the operation by the user of the external device communicating with the image reading device 11.

Further, in the image reading device 11 in which the image of the transmitted document MS is read by the reading units 31 and 32, the lower the transport speed of the document MS, the higher the resolution of the image data is generated. To. Therefore, it can be said that the first reading mode for providing the user with high-resolution image data is a mode in which the document MS is conveyed at a speed that correlates with the resolution requested by the user.

FIG. 3 illustrates an example of a table showing a plurality of (three in this case) first read modes. As shown in FIG. 3, the first mode is a reading mode in which the original MS has a high transport speed and generates image data having a low resolution. The second mode is a scanning mode in which the original MS has a medium transport speed and generates image data having a medium resolution. The third mode is a reading mode in which the transport speed of the original MS is low and image data having high resolution is generated.

Then, when instructing the image reading device 11 to read the image, the user can select one reading mode (that is, the first reading mode) from the above three modes.

Here, the image reading device 11 of the present embodiment can read images of various document MSs having different thicknesses. The thinner the original MS is, the more likely it is that paper jams and other transport defects will occur during transport. In order to suppress the occurrence of such transport defects, it is desirable to transport the document MS at a low speed.

Therefore, as described above, the user interface 50 is provided with the identification button 51A. The identification button 51A is a button that is turned on when reading an image of a document MS, which is prone to transfer defects during transfer, such as a thin document MS. Then, when the identification button 51A is turned on by the user's operation, specific setting information which is information about the specific user operation is input to the control device 60 (see FIG. 4) as the control unit of the image reading device 11. Then, a second reading mode different from the first reading mode is implemented. The "specific user operation" referred to here is a button operation by the user for turning on the specific button 51A.

That is, the operation of reading the image from the original MS when the specific setting information is not input to the control device 60 is set as the first reading mode. Further, the operation of reading the image from the document MS when the specific setting information is input to the control device 60 is set as the second reading mode.

The second scanning mode is a mode for generating image data having the same resolution as in the first scanning mode while transporting the document MS at a lower speed than in the first scanning mode. For example, when the identification button 51A is turned on in a situation where the user has selected the execution of the first mode, that is, in a situation where the resolution requested by the user is low, the second mode shown below is shown. Read mode is implemented. -The original MS is conveyed at a lower speed than when the first mode is performed. For example, the original MS is conveyed at the transfer speed in the third mode, or at a speed similar to the transfer speed. -Generate image data with the same resolution as in the first mode.

Further, when the identification button 51A is turned on in a situation where the user has selected the execution of the third mode, that is, in a situation where the resolution requested by the user is high, the second mode shown below is used. Read mode is implemented. -The original MS is conveyed at a lower speed than when the third mode is performed. -Generate image data with the same resolution as in the third mode.

By implementing such a second scanning mode, the original MS is conveyed at a low speed, so that the occurrence of defective transfer of the original MS is suppressed even when scanning an image of a thin original MS. To. Moreover, even if the original MS is conveyed at a low speed in this way, the resolution of the image based on the generated image data is the resolution requested by the user, that is, the case of the first reading mode selected by the user. Equal resolution.

Next, the control device 60 of the image reading device 11 will be described with reference to FIG.
The control device 60 includes a microcomputer composed of a CPU, ROM, RAM, and the like, and various driver circuits. As shown in FIG. 4, such a control device 60 includes a transfer control unit 61, a mode selection unit 66, a data generation unit 64, and a data output unit 65 as functional units composed of at least one of software and hardware. I'm out.

The transport control unit 61 controls the transport device 20. That is, when the transfer start instruction of the document MS, that is, the instruction to read the image of the document MS is input, the transfer control unit 61 rotates the feed roller 21 by driving the delivery motor 25. As a result, one document MS is fed into the housing 12 from the set unit 14. Then, the transport control unit 61 stops the drive of the feed motor 25 when the document MS transported by the rotation of the feed roller 21 is sandwiched by the two rollers 221 and 222 constituting the feed roller pair 22. ..

Further, the transfer control unit 61 rotates each of the rollers 221,231, 241,222,232,242 of the delivery roller pair 22, the transfer roller pair 23, and the discharge roller pair 24 by driving the transfer motor 26. The drive start timing of the transfer motor 26 may be the same as the drive start timing of the transmission motor 25, or may be later than the drive start timing of the transmission motor 25. Then, the transfer control unit 61 stops the drive of the transfer motor 26 after the timing when the rear end of the document MS passes through the discharge roller pair 24.

Information regarding the transfer speed of the document MS is input to the transfer control unit 61 from the mode selection unit 66. Then, the transfer control unit 61 controls the drive of the transfer motor 26 so as to transfer the document MS at a speed based on the input information.

The mode selection unit 66 determines the reading mode to be executed based on the user information input when the image is read. That is, when the information for specifying the image resolution is input from the user interface 50 or the external device, the mode selection unit 66 selects the first reading mode according to the image resolution requested by the user. (See Fig. 3). For example, when the user requests a high resolution image, the mode selection unit 66 selects a third mode. Then, the mode selection unit 66 outputs the information regarding the selected reading mode to the transfer control unit 61 and the data generation unit 64. Further, when the identification button 51A is in the ON state, the mode selection unit 66 selects the second reading mode and outputs information regarding the reading mode to the transport control unit 61 and the data generation unit 64.

The data generation unit 64 controls the reading units 31 and 32 of the reading device 30, and acquires the images read by the reading units 31 and 32. Then, the data generation unit 64 generates image data which is the data of the image read by the reading units 31 and 32, and outputs this image data to the data output unit 65.

The resolution of the image based on the image data generated at this time is a resolution corresponding to the information regarding the resolution input from the mode selection unit 66. That is, when the identification button 51A is in the off state, the data generation unit 64 generates image data having a resolution corresponding to the transport speed of the original MS. On the other hand, when the identification button 51A is on, the data generation unit 64 generates image data having a resolution requested by the user even if the transport speed of the original MS is low.

Here, the acquisition of the image from the original MS is realized by having the reading units 31 and 32 read the image at predetermined timings while the original MS is being conveyed. Therefore, the resolution of the image acquired by the reading units 31 and 32 increases as the conveying speed of the document MS decreases. Therefore, the resolution of the image acquired when the second reading mode is performed may be higher than the resolution desired by the user. Therefore, in the second reading mode, the data generation unit 64 lowers the resolution of the acquired image to the resolution desired by the user, and generates data of the image having the same resolution.

Further, when the second reading mode is executed, the data generation unit 64 can acquire an image having a low resolution (that is, an image having a resolution assuming that the first reading mode is executed) so that the reading unit 31 can acquire the image. , 32 may be controlled. For example, by delaying the above-mentioned predetermined timing, it is possible to acquire an image having a resolution lower than the resolution according to the transport speed of the original MS. In this case, the data generation unit 64 can generate image data having a resolution requested by the user even if the transport speed of the original MS is low. That is, it is not necessary to carry out a process of lowering the resolution of the acquired image.

The data output unit 65 transmits the image data generated by the data generation unit 64 to the external device.
Next, the processing procedure for reading the image of the original MS will be described with reference to the flowchart shown in FIG.

As shown in FIG. 5, it is determined whether or not the identification button 51A is in the ON state when any one of the first mode, the second mode, and the third mode is selected. (Step S11). When the identification button 51A is in the off state (step S11: NO), the first reading mode is selected (step S12), and the process proceeds to step S14, which will be described later. On the other hand, when the identification button 51A is in the ON state (step S11: YES), the second reading mode is selected (step S13), the identification lamp 52A is turned on, and the process proceeds to the next step S14. To.

By starting the execution of the selected reading mode in step S14, the reading of the image is started. For example, when the identification button 51A is off and the second mode is selected, the transport device 20 transports the document MS at a medium speed to generate medium resolution image data. Further, when the identification button 51A is in the ON state and the second mode is selected, the original MS is conveyed at a low speed by the conveying device 20, and image data of an image having a medium resolution is generated.

Then, while the image is being read in this way, it is determined whether or not the attenuation factor α detected by the double feed detection sensor 610 is equal to or higher than the double feed detection attenuation factor αTh1 (step S15). .. The double feed detection attenuation factor αTh1 is a threshold value for determining whether or not a plurality of document MSs are conveyed in an overlapping state. For example, when only one original MS having a normal thickness is conveyed and this original MS is located between the output unit 611 and the input unit 612 of the double feed detection sensor 610, the attenuation factor α is set to "standard attenuation". Let's say "rate". In this case, the double feed detection attenuation factor αTh1 is set to a value larger than the standard attenuation factor.

When the attenuation factor α is equal to or higher than the double feed detection attenuation factor αTh1 (step S15: YES), it can be determined that the plurality of original MSs are being conveyed in an overlapping state, so that the reading of the image is stopped. (Step S16). In this case, the transport of the document MS is stopped, and the user interface 50 notifies the user of the error. After that, this process is terminated.

On the other hand, when the attenuation factor α is less than the double feed detection attenuation factor αTh1 (step S15: NO), it can be determined that only one document MS is being conveyed, so that the image reading is continued. Then, it is determined whether or not the reading of the image is completed (step S17).

The rear end of the document MS can be detected based on the scanning results of the scanning units 31 and 32. That is, based on the reading result by the reading units 31 and 32, it can be determined whether or not the rear end of the document MS is located downstream of the reading units 31 and 32 in the transport direction. Then, when the rear end of the document MS is located downstream of the reading units 31 and 32 in the transport direction, it can be determined that the reading of the image of the document MS is completed.

If the reading of the image of the original MS has not been completed yet (step S17: NO), the process proceeds to step S15 described above, and the reading of the image is continued. On the other hand, when the reading of the image of the original MS is completed (step S17: YES), the process proceeds to the next step S18.

In step S18, it is determined whether or not there is the next document MS for which the image should be read. If there is a next manuscript MS (step S18: YES), the process proceeds to step S14 described above, and the transfer of the next manuscript MS is started. In this case, the transport speed of the next document MS is equal to the transport speed of the previous document MS. On the other hand, when there is no next manuscript MS (step S18: NO), the image data generated by the data generation unit 64 is output by the data output unit 65 (step S19), and this process is terminated.

When reading images of a plurality of original MSs in succession, the identification button 51A may be operated by the user during continuous reading of a series of images. In the image reading device 11 of the present embodiment, the operation of the identification button 51A by such a user is invalidated. That is, even if the identification button 51A is operated during continuous scanning of images, the transport speed of one document is equal to the transport speed of the next document of the one document. In other words, the operation of the identification button 51A is valid until the execution of continuous reading of a series of images is started, that is, before the process described with reference to FIG. 5 is started.

As described above, according to the image reading device 11 of the present embodiment, the following effects can be obtained.
(1) When the reading of the image is instructed while the identification button 51A is in the off state, the first reading mode is executed. That is, when the user recognizes that the thickness of the document MS set in the set unit 14 is not thin, the user instructs the image reading device 11 to read the image without turning on the identification button 51A. To. At this time, the resolution of the image based on the generated image data can be selected by the user when the user inputs a reading instruction. Therefore, the document MS is transported at a transport speed corresponding to the resolution of the image requested by the user, and image data having the resolution requested by the user is generated. Therefore, it is possible to provide the user with image data having a resolution desired by the user.

On the other hand, when the reading of the image is instructed while the identification button 51A is on, the second reading mode is executed. That is, when the user recognizes that the thickness of the document MS set in the set unit 14 is thin, the user instructs the image reading device 11 to read the image after the identification button 51A is turned on. .. At this time, although the original MS is conveyed at a lower speed than in the first scanning mode, image data having the same resolution as in the first scanning mode is generated. That is, it is possible to provide the user with image data that does not depend on the transport speed of the original MS while suppressing transport defects such as paper jams. Therefore, even when the transport speed of the original MS is variable, it is possible to generate image data having a resolution desired by the user.

(Second embodiment)
Next, a second embodiment embodying the image reading device 11 will be described with reference to FIG. In the second embodiment, a part of the processing procedure when the identification button 51A is in the ON state is different from the first embodiment. Therefore, in the following description, the parts different from those of the first embodiment will be mainly described, and the same member configurations as those of the first embodiment will be designated by the same reference numerals and duplicate description will be omitted. To do.

FIG. 6 shows a flowchart illustrating a processing procedure when reading an image of the original MS.
As shown in FIG. 6, it is determined whether or not the identification button 51A is in the ON state when any one of the first mode, the second mode, and the third mode is selected. (Step S11). When the identification button 51A is in the off state (step S11: NO), the first reading mode is selected (step S12), and the process proceeds to step S14, which will be described later. On the other hand, when the identification button 51A is in the ON state (step S11: YES), the second reading mode is selected (step S13), and the process proceeds to the next step S14.

By starting the execution of the selected reading mode in step S14, the reading of the image is started. Then, when the attenuation factor α detected by the double feed detection sensor 610 becomes equal to or higher than the double feed detection attenuation factor αTh1 while the image is being read in this way (step S15: YES), a plurality of images are being read. Since it can be determined that the original MSs are being conveyed in an overlapping state, the reading of the images is stopped (step S16). In this case, the transport of the document MS is stopped, and the user interface 50 notifies the user of the error. For example, the identification lamp 52A is turned on. After that, this process is terminated.

On the other hand, when the attenuation factor α is less than the double feed detection attenuation factor αTh1 (step S15: NO), it can be determined that only one document MS is being conveyed, so that the image reading is continued. Then, when the reading of the image of the original MS is not completed yet (step S17: NO), the process shifts to the above-mentioned step S15, and the reading of the image of the original MS is continued. On the other hand, when the reading of the image of the original MS has already been completed (step S17: YES), the process proceeds to the next step S18.

In step S18, it is determined whether or not there is the next document MS for which the image should be read. If there is no next manuscript MS (step S18: NO), the image data generated by the data generation unit 64 is output by the data output unit 65 (step S19), and this process is terminated.

On the other hand, when there is the next manuscript MS (step S18: YES), the process shifts to the above-mentioned step S11, and the transfer of the next manuscript MS is started. That is, if the identification button 51A is changed during the reading of the previous image, the transport speed of the original MS is changed from the time of reading the current image, but the resolution of the image based on the generated image mode is the previous one. The resolution is the same as when the image is read.

For example, when the identification button 51A is changed from the off state to the on state during the reading of the previous image, the first reading mode is executed when the previous image is read, whereas the reading of the current image is performed. Sometimes a second read mode is implemented. That is, at the start of reading the image this time, the mode to be executed is switched from the first reading mode to the second reading mode.

On the other hand, when the identification button 51A is changed from the on state to the off state during the reading of the previous image, the second reading mode is executed at the time of reading the previous image, whereas the reading of the current image is performed. Sometimes a first read mode is implemented. That is, when the setting information to end the second reading mode is input in the situation where the second reading mode is selected, the mode to be executed at the start of reading the image this time is the second mode. The reading mode can be switched to the first reading mode. Therefore, in the image reading device 11 of the present embodiment, the transition of the identification button 51A from the on state to the off state by the operation of the identification button 51A by the user corresponds to the "predetermined end condition".

As described above, according to the image reading device 11 of the present embodiment, in addition to the same effect as the effect (1) in the first embodiment, the following effects can be further obtained.
(2) When scanning images of a plurality of original MSs in succession, if the identification button 51A is turned on while one of the originals of each original MS is being conveyed, the image of one original is displayed. The execution of the first reading mode is continued until the reading is completed. That is, the scanning mode is not changed during the transfer of one document, and the transfer speed of the same document is not changed. Therefore, it is possible to suppress an increase in the control load due to switching of the reading mode during image reading.

After that, when scanning the image of the next original, the second scanning mode is executed instead of the first scanning mode. That is, when scanning the images of the originals after the first original, the originals are conveyed at a low speed. Moreover, since the second scanning mode is used, even if the document is conveyed at a low speed, image data having the same resolution as in the first scanning mode is generated. Therefore, when scanning the images of the originals after the above-mentioned one original, the original MS is conveyed at a low speed to suppress the occurrence of the original MS, and the image data that does not depend on the conveying speed is provided to the user. Can be provided.

(3) However, if the identification button 51A is changed from the on state to the off state while the image of the original MS is being read in the second scanning mode, the second scanning mode is executed. It can be determined that the end condition is satisfied. Therefore, when the image of the next document MS is read, the first scanning mode is executed, and the document MS is conveyed at a speed defined by the first scanning mode. Therefore, when it is no longer necessary to carry out the second reading mode, the second reading mode can be appropriately switched to the first reading mode.

(Third Embodiment)
Next, a third embodiment embodying the image reading device 11 will be described with reference to FIGS. 7 and 8. In the third embodiment, the thickness of the original MS to be read of the image is automatically detected, and based on the detection result, whether to carry out the second reading mode or the first reading mode is determined. The point of judgment is different from each of the first and second embodiments. Therefore, in the following description, the parts different from the first and second embodiments will be mainly described, and the same member configurations as those of the first and second embodiments are designated by the same reference numerals. The duplicate explanation shall be omitted.

The control device 60 of the image reading device 11 will be described with reference to FIG. 7.
The control device 60 includes a microcomputer composed of a CPU, ROM, RAM, and the like, and various driver circuits. As shown in FIG. 7, such a control device 60 includes a transfer control unit 61, a mode selection unit 66, a data generation unit 64, and a data output unit 65 as functional units composed of at least one of software and hardware. I'm out.

The mode selection unit 66 determines whether or not the thickness of the conveyed document MS is thin based on the attenuation factor α detected by the double feed detection sensor 610. Then, when it is determined that the thickness of the original MS is not thin, the mode selection unit 66 selects the first scanning mode (see FIG. 3) according to the resolution of the image requested by the user, and selects the first. Information about the reading mode (for example, the third mode) is output to the transport control unit 61 and the data generation unit 64. On the other hand, when it is determined that the thickness of the original MS is thin, the mode selection unit 66 selects the second reading mode and outputs information regarding the selected second reading mode to the transport control unit 61 and the data generation unit 64. ..

Here, an example of a method for determining whether or not the thickness of the conveyed document MS is thin will be described.
That is, when the document MS is located between the output unit 611 and the input unit 612 of the double feed detection sensor 610, the sound wave output from the output unit 611 passes through the document MS and is input to the input unit 612. At this time, when the sound wave is transmitted through the document MS, the thinner the document MS is, the less the sound wave is attenuated. That is, the thickness of the original MS can be estimated to some extent based on the sound wave attenuation rate α. Therefore, a determination attenuation factor αTh2 is provided as an attenuation factor that serves as a criterion for determining whether or not the thickness of the original MS is thin, and when the attenuation factor α is less than the determination attenuation factor αTh2, the thickness of the conveyed original MS is thin. I am trying to judge.

It should be noted that a plurality of thin document MSs may be conveyed in an overlapping state. For example, when two document MSs overlap, the attenuation factor α detected by the double feed detection sensor 610 is larger than the attenuation rate when one document MS having a small thickness is conveyed. Therefore, the double feed detection attenuation factor αTh1 is set to a value larger than the attenuation factor when one document MS having a small thickness is conveyed. Thereby, when the attenuation factor α is the determination attenuation factor αTh2 or more and the double feed detection attenuation factor αTh1 or less, it can be determined that the thickness of the conveyed document MS is not thin. On the other hand, when the attenuation factor α is the double feed detection attenuation factor αTh1 or more, it can be determined that a plurality of document MSs are conveyed in an overlapping state.

Next, the processing procedure for reading the image of the original MS will be described with reference to the flowchart shown in FIG.
As shown in FIG. 8, the transfer of the original MS in the first scanning mode according to the resolution of the image requested by the user is started (step S31). Then, when the document MS is positioned between the output unit 611 and the input unit 612 of the double feed detection sensor 610, is the attenuation factor α detected by the double feed detection sensor 610 less than the determination attenuation factor αTh2? Whether or not it is determined (step S32). That is, in step S32, it is determined whether or not the thickness of the conveyed document MS is thin.

When the attenuation factor α is less than the determination attenuation factor αTh2 (step S32: YES), it is determined that the document MS having a thin thickness is being conveyed, and the reading mode is changed from the first reading mode to the second reading mode. Switching (step S33). As a result, the transport speed of the document MS is reduced. When the second reading mode is implemented in this way, the identification lamp 52A is turned on. Then, the process proceeds to the next step S34.

In step S34, it is determined whether or not the front end of the document MS is detected by the edge detection sensor 600. If the front end of the document MS has not yet been detected (step S34: NO), the process proceeds to step S32 described above. On the other hand, when the front end of the document MS is detected (step S34: YES), the process proceeds to step S37, which will be described later. That is, when the front end of the document MS passes through the end detection sensor 600 and reaches just before the reading device 30, the change of the reading mode is prohibited and the transport speed of the document MS is not changed.

On the other hand, in step S32, when the attenuation factor α is the determination attenuation factor αTh2 or more (NO), it can be determined that the thickness of the conveyed document MS is not thin, so that the attenuation factor α is double-fed. It is determined whether or not the detection attenuation factor is less than αTh1 (step S35). In this step S35, it is determined whether or not a plurality of document MSs are conveyed in an overlapping state. Then, when the attenuation factor α is less than the double feed detection attenuation factor αTh1 (step S35: YES), it can be determined that one document MS having a thin thickness is being conveyed, so that the process is the step described above. It is transferred to S34. In this case, the image is read by the reading units 31 and 32 while the document MS is being conveyed at the conveying speed specified in the first scanning mode. When the document MS is conveyed in the first scanning mode in this way, the identification lamp 52A is turned off.

On the other hand, when the attenuation factor α is the double feed detection attenuation factor αTh1 or more (step S35: NO), it can be determined that the plurality of document MSs are being conveyed in an overlapping state, so that the image reading is stopped. (Step S36). In this case, the transport of the document MS is stopped, and the user interface 50 notifies the user of the error. After that, this process is terminated.

In step S37, scanning of the image of the transmitted document MS is started. Then, it is determined whether or not the attenuation factor α detected by the double feed detection sensor 610 while the image is being read is less than the double feed detection attenuation factor αTh1 (step S38). .. When the attenuation factor α is the double feed detection attenuation factor αTh1 or more (step S38: NO), it can be determined that a plurality of original MSs are conveyed in an overlapping state, so that the process is performed in step S36 described above. Will be migrated. That is, when it is detected that a plurality of original MSs are being conveyed in an overlapping state, the reading of the image during the execution is stopped.

On the other hand, when the attenuation factor α is less than the double feed detection attenuation factor αTh1 (step S38: YES), it is determined whether or not the scanning of the image of the transmitted original MS is completed (step S39). If the reading of the image has not been completed yet (step S39: NO), the process proceeds to step S38 described above, and the reading of the image is continued. On the other hand, when the reading of the image is completed (step S39: YES), the process proceeds to the next step S40.

In step S40, it is determined whether or not there is the next document MS for which the image should be read. If there is a next manuscript MS (step S40: YES), the process proceeds to step S31 described above, and the transfer of the next manuscript MS is started. In this case, even after the image has been read in the second scanning mode, the transfer of the original MS in the first scanning mode is started. That is, the completion of scanning the image of the original MS corresponds to the "predetermined end condition" for switching the mode from the second scanning mode to the first scanning mode.

On the other hand, when there is no next document MS (step S40: NO), the image data generated by the data generation unit 64 is output by the data output unit 65 (step S41), and this process is completed.

As described above, according to the image reading device 11 of the present embodiment, the following effects can be obtained.
(4) When the thickness of the document MS transported by the transport device 20 is not thin, the first scanning mode is implemented. When the user instructs the image reading device 11 to read the image of the original MS, the resolution of the image based on the generated image data can be selected by the user. Therefore, it is possible to provide the user with image data which is image data having a resolution desired by the user.

On the other hand, when the thickness of the document MS transported by the transport device 20 is thin, the second scanning mode is implemented. In this case, although the original MS is conveyed at a lower speed than in the first scanning mode, image data having the same resolution as in the first scanning mode is generated. That is, it is possible to provide the user with image data that does not depend on the transport speed of the original MS while suppressing transport defects such as paper jams. Therefore, even when the transport speed of the original MS is variable, it is possible to generate image data having a resolution desired by the user.

(5) In the image reading device 11 of the present embodiment, when the attenuation factor α of the sound wave detected by the double feed detection sensor 610 is less than the determination attenuation factor αTh2, it is determined that the thickness of the conveyed document MS is thin. Therefore, the second reading mode is implemented. By using the detection result by the double feed detection sensor 610 in this way, the second reading mode can be automatically selected and executed.

(6) The double feed detection attenuation factor αTh1 which is a threshold value for determining whether or not a plurality of original MSs are conveyed in an overlapping state is determined to be a value larger than the determination attenuation factor αTh2. Then, by using this double feed detection attenuation factor αTh1, it is possible to determine whether only one original document having a thin thickness is being conveyed or whether a plurality of original documents are being conveyed in an overlapping state. Then, by adopting such a discrimination result, the image reading device 11 can be appropriately driven according to the situation.

(7) The double feed detection sensor 610 is arranged between the transport roller pair 23 and the feed roller pair 22 in the transport direction. Therefore, it is possible to determine whether or not the thickness of the conveyed document MS is thin before the tip of the document MS reaches the position of the reading device 30. Therefore, it is determined whether to switch the mode from the first reading mode to the second reading mode or to continue the first reading mode before the reading of the image by the reading units 31 and 32 is actually started. can do. Therefore, it is not necessary to change the transport speed of the document MS while the images are actually being read by the reading units 31 and 32.

(8) Then, when the transport of the document MS in the second scanning mode is completed, the end condition of the second scanning mode is satisfied, so that the transport of the document MS in the first scanning mode is started. Therefore, when scanning images of a plurality of original MSs in succession, if a part of each original MS is a thin original, the original is conveyed at a low speed only when the image of the thin original is read. can do. Therefore, even when reading an image of a document that is not thin, it is possible to suppress a decrease in the throughput of the image reading device 11 as compared with the case where the document is conveyed at a low speed.

Each of the above embodiments may be changed as follows.
-In the third embodiment, if the double feed detection sensor 610 is arranged upstream of the reading device 30 in the transport direction, the double feed detection sensor 610 is used for the feed roller pair 22 and the transport roller pair 23 in the transport direction. It may be placed in a position other than between and. For example, the double feed detection sensor 610 may be arranged between the reader 30 in the transport direction and the transport roller pair 23.

-If the sensor can detect whether the thickness of the transmitted document MS is thin and whether or not a plurality of document MSs are transported in an overlapping state, a sensor other than the sound wave sensor is double-fed. It may be applied as a detection sensor.

The current value flowing through the transport motor 26 during transport of the document MS increases as the load applied to the roller pair rotating with the transport motor 26 as the drive source increases. Then, such a load changes depending on the thickness of the transmitted document MS and the number of overlapping document MSs. Therefore, in the second embodiment, it is determined whether or not the thickness of the transmitted document MS is thin based on the current value flowing through the transfer motor 26 instead of the attenuation factor α detected by the double feed detection sensor 610. You may try to do it. Similarly, in each of the first and second embodiments, it may be determined whether or not a plurality of document MSs are conveyed in an overlapping state based on the current value flowing through the transfer motor 26.

In each of the first and second embodiments, the user operation for selecting the second reading mode is performed not by the user interface 50 of the image reading device 11 but by an external device capable of communicating with the image reading device 11. You may do so. In this case, the second reading mode is executed when the control device 60 of the image reading device 11 receives the specific setting information which is the information related to the user operation from the external device.

-In each of the first and second embodiments, when the reading of the image in the second reading mode is completed and the image is read based on the next job, the identification button 51A is turned off and specified. The lamp 52A may be turned off to perform the first reading mode. In this case, inputting an image reading instruction based on the next job to the control device 60 corresponds to the "end condition".

-In each of the above embodiments, the second reading mode is implemented as needed even when the third mode is selected by the user, but the third mode is not limited to this. The second read mode may not be performed when selected. In this case, for example, in each of the first and second embodiments, when the third mode is selected, the third mode is the third, regardless of whether the identification button 51A is on or off. The mode will be implemented. Further, in the third embodiment, when the third mode is selected, even if the attenuation rate α of the sound wave detected by the double feed detection sensor 610 is less than the determination attenuation rate αTh2, the third embodiment The mode will be implemented.

-In each of the first and second embodiments, the attenuation rate α of the sound wave detected by the double feed detection sensor 610 is the determination attenuation rate αTh2 or more even when the identification button 51A is in the ON state. Occasionally, the first read mode may be implemented. Further, when the identification button 51A is in the ON state and the attenuation rate α of the sound wave detected by the double feed detection sensor 610 is less than the determination attenuation rate αTh2, the second reading mode may be executed. Good.

Further, when the identification button 51A is in the off state, the first reading mode is executed even if the attenuation factor α of the sound wave detected by the double feed detection sensor 610 is less than the determination attenuation factor αTh2. You may.

The reading device 30 may be configured to include only one of the first reading unit 31 and the second reading unit 32.
The transport device 20 may be configured not to include the delivery motor 25. In this case, the feed roller 21 may be rotated by driving the transfer motor 26.

-The image reading device may be embodied in another device such as a facsimile machine as long as it is a device that generates image data related to the image of the original and outputs it to an external device.

11 ... Image reading device, 20 ... Conveying device as a transporting unit, 221,222 ... Roller functioning as a feeding roller, 23 ... Conveying roller pair, 31, 32 ... Reading unit, 60 ... Control device as a control unit, 600 ... Edge detection sensor composed of sound wave sensor, MS ... original, α ... attenuation factor, αTh1 ... double feed detection attenuation factor, αTh2 ... judgment attenuation factor.

Claims (6)

A transport unit that transports documents and
A reading unit that reads an image of a document conveyed by the conveying unit,
In an image reading device including a control unit that generates image data that is image data read by the reading unit.
When the document is transported by the transport unit, the scanning unit reads the image of the document at predetermined timings.
The operation of reading an image from a document when the user does not request the transfer of the document at a low speed is set as the first scanning mode, and the image is read from the document when the user requests the transfer of the document at a low speed. When the operation is set to the second read mode,
The control unit
In the first scanning mode, the scanning unit is made to read an image from the document transported by the transporting unit at a speed corresponding to the required resolution, and image data of the image read by the scanning unit is generated. ,
In the second scanning mode, the scanning unit reads an image from the document conveyed by the conveying unit at a lower speed than in the case of the first scanning mode, and the timing is set to the first scanning mode. By delaying the case or by lowering the resolution of the image read by the reading unit, the image data of the image having the same resolution as in the case of the first reading mode is generated.
The control unit
When the first scanning mode is selected as the operation for scanning the image from the document and the third mode in which the first resolution is set as the resolution is selected, the first scanning mode is selected. Is carried out, the original is conveyed by the conveying unit at the first conveying speed, and the image data of the image of the first resolution is generated by reading the image of the original by the reading unit.
When the first scanning mode is selected as an operation for scanning an image from a document, and a second mode in which a second resolution lower than the first resolution is set as a resolution is selected. Performs the first scanning mode , transports the document at a second transport speed higher than the first transport speed by the transport unit, and reads the image of the document by the scanning unit. It is designed to generate image data for images with a second resolution.
The control unit
When the second scanning mode is selected as the operation of scanning the image from the document and the third mode in which the first resolution is set is selected as the resolution, the second mode is selected. The scanning mode is not performed , the document is transported by the transport unit at the first transport speed, and the image data of the image of the first resolution is generated by scanning the image of the document by the scanning unit.
When the second scanning mode is selected as the operation of scanning the image from the document and the second mode in which the second resolution is set is selected as the resolution, the second mode is selected. A scanning mode is performed , the document is transported by the transport unit at a third transport speed lower than the second transport speed, and the image of the document is read by the scanning unit to obtain an image of the second resolution. An image reader characterized by generating image data. With a user interface
The image reading device according to claim 1, wherein the control unit selects the second reading mode when the transfer of the document at a low speed is required by the operation of the user interface. Claim 1 or claim that the control unit selects the second reading mode when it receives information from an external device capable of communicating with the image reading device that the original is required to be conveyed at a low speed. Item 2. The image reading device according to item 2. When the user requests that the original be transported at a low speed, the control unit selects the second scanning mode when scanning the image of the original until the scanning of the image of the original is completed. The image reading device according to any one of claims 1 to 3, wherein the image reading device is characterized in that. With a user interface
The user interface is selectably configured either one of the first of the third resolution is set mode and the second mode in which the as-resolution second resolution is set as the resolution Has been
When the control unit selects the second scanning mode as an operation for scanning an image from a document,
When the third mode in which the first resolution is set as the resolution by the operation of the user interface is selected, the document is conveyed by the conveying unit at the first conveying speed, and the reading unit transfers the document. By reading the image of the original, the image data of the image of the first resolution is generated, and the image data is generated.
When the second mode in which the second resolution is set as the resolution by the operation of the user interface is selected, the document is conveyed by the conveying unit at the third conveying speed, and the reading unit transfers the document. The image reading apparatus according to any one of claims 1 to 4, wherein image data of an image having the second resolution is generated by reading an image of a document. In communicable external apparatus and the image reading apparatus, any of the said second mode said as the third mode and the resolution of the first resolution is set as the resolution second resolution is set It is possible to choose either one,
When the control unit selects the second scanning mode as an operation for scanning an image from a document,
When the information to the effect that the third mode in which the first resolution is set as the resolution is selected is received from the external device, the document is conveyed by the conveying unit at the first conveying speed, and the reading is performed. By reading the image of the manuscript by the unit, the image data of the image of the first resolution is generated.
When the information to the effect that the second mode in which the second resolution is set as the resolution is selected is received from the external device, the document is conveyed by the conveying unit at the third conveying speed, and the reading is performed. The image reading device according to any one of claims 1 to 4, wherein the image data of the image of the second resolution is generated by reading the image of the original document by the unit.

Images