JP7396339B2 - Image reading device, image reading system, and image reading control method - Google Patents

Description

The present invention relates to an image reading device including a reading section that reads an image of a document being conveyed by a conveyance section. The present invention also relates to an image reading system and an image reading control method.

Patent Document 1 describes an example of an image reading device in which a document set in a setting section is conveyed to a predetermined reading position, and an image of the document conveyed to the reading position is read by a reading section.

By the way, when conveying a color document, conveyance defects such as paper jams are more likely to occur than when conveying a monochrome document. Therefore, in the image reading apparatus described in Patent Document 1, when reading an image of a color original, the original is conveyed at a lower speed than when reading an image of a monochrome original. Specifically, when information based on a user's operation is input, the control device of the image reading device determines whether to read an image of a color document or a monochrome document. Then, when reading an image of a monochrome original, a normal transport mode is selected, and when reading an image of a color original, a transport mode for slower transport than the normal transport mode is selected. The transport unit is operated in the transport mode selected in this manner.

Japanese Patent Application Publication No. 2003-128298

Incidentally, an image reading device may read images of various documents having different thicknesses. When transporting thin originals, transport defects such as paper jams are more likely to occur than when transporting thick originals. Therefore, when reading an image of a thin original, it is desirable to transport 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 section to read an image of a document being conveyed by a conveyance section, there is generally a correlation between the conveyance speed of the document and the resolution of the acquired image. Specifically, the lower the document conveyance speed, the more image data that is image data with higher resolution is generated. Therefore, when changing the document conveyance speed according to the thickness of the document, the generated image data does not necessarily have the resolution desired by the user.

An object of the present invention is to provide an image reading device , an image reading system, and an image reading control method that can generate image data with a resolution desired by a user even when the conveyance speed of a document is varied. There is a particular thing.

An image reading device for achieving the above object includes a transport section that transports a document, a reading section that reads an image of the document transported by the transport section, and an image data that is the data of the image read by the reading section. In the image reading device, the reading unit reads an image of the original at predetermined timing when the original is being transported by the transporting unit, and the reading unit reads the image of the original at predetermined timing. A first reading mode is an operation of reading an image from a document when setting information is not input to the control section, and an operation of reading an image from the document when the specific setting information is input to the control section. is set to the second reading mode, the control unit causes the reading unit to read an image from the document transported by the transport unit at a speed corresponding to the required resolution in the first reading mode. and generating image data of the image read by the reading section, and in the second reading mode, the image is read from the document transported by the transporting section at a lower speed than in the first reading mode. By delaying the timing from that in the first reading mode, image data of an image having the same resolution as in the first reading mode is generated. The control unit changes the reading mode to be executed from the second reading mode to the first reading mode when starting reading an image based on the next job in a situation where the second reading mode is selected. Switch to reading mode.

According to the above configuration, when image reading is instructed in a situation where the specific setting information is not input to the control unit, the first reading mode is executed. In other words, if the user recognizes that the thickness of the document is not thin, the user can instruct the image reading device to read the image without performing any user operations such as inputting the above-mentioned specific setting information to the control unit. 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 transported at a transport speed that correlates with the resolution requested by the user, and image data at the resolution requested by the user is generated. Therefore, it is possible to provide the user with image data of the resolution desired by the user.

On the other hand, when image reading is instructed under a situation where the above-mentioned specific setting information is input to the control unit, the second reading mode is implemented. In other words, if the user recognizes that the document is thin, the user performs an operation such as inputting the above specific setting information into the control unit, and then the user instructs the image reading device to read the image. be done. At this time, although the document is transported at a lower speed than in the first reading mode, image data of an image having the same resolution as in the first reading mode is generated. That is, it is possible to provide the user with image data that does not depend on the document conveyance speed while suppressing conveyance defects such as paper jams. Therefore, even if the document conveyance speed is varied, image data with the resolution desired by the user can be generated.

In the image reading device, the control unit may input the specific setting information while the transport unit is transporting one of the originals when sequentially reading images of a plurality of originals. In this case, it is preferable to switch the reading mode from the first reading mode to the second reading mode at the start of reading an image of a document subsequent to the one document.

According to the above configuration, when the images of a plurality of originals are read continuously, if the specific setting information is input to the control unit while one of the originals is being conveyed, The first reading mode continues until reading of the image is completed. That is, while one document is being conveyed, the reading mode is not changed and the conveyance speed of the same document is not changed. Therefore, it is possible to suppress an increase in control load caused by switching the reading mode during image reading.

Thereafter, when reading the image of the next document, the second reading mode is used instead of the first reading mode. That is, when reading images of originals after the first original, the originals are transported at a low speed. Moreover, since it is the second reading mode, even if the document is conveyed at a low speed, image data that is image data with the same resolution as in the first reading mode is generated. Therefore, when reading images of originals after the first original, the original is transported at a low speed to prevent the occurrence of transport failures of the same original, while providing the user with image data that does not depend on the transport speed. becomes possible.

Further, an image reading device for achieving the above object includes a transport unit that transports a document, a reading unit that reads an image of the document transported by the transport unit, and an image that is data of the image read by the reading unit. In the image reading apparatus, an operation of reading an image from the original document being transported by the transporting section when the thickness of the original document is not thin is set as a first reading mode; When the second reading mode is used to read an image from a thin original document being conveyed by the first reading mode, the control unit may be configured to read images from a thin original document in the first reading mode. causing the reading section to read an image from a document transported by the transporting section at a corresponding speed, and generating image data of the image read by the reading section; While causing the reading unit to read an image from a document transported by the transport unit at a slower speed than in the first reading mode, image data of an image having the same resolution as in the first reading mode is generated. Note that "when the thickness of the original is not thin" means when the thickness of the original is not thinner than the specified thickness, and "when the thickness of the original is thin" means when the thickness of the original is less than the specified thickness. This is also the case when it is thin.

According to the above configuration, when the document being transported by the transport section is not thin, the first reading mode is executed. Note that when a user instructs the image reading device to read an image of a document, the user can select the resolution of the image based on the generated image data. Therefore, it is possible to provide the user with image data of the resolution desired by the user.

On the other hand, when the document being transported by the transport section is thin, the second reading mode is implemented. In this case, although the document is transported at a slower speed than in the first reading mode, image data with the same resolution as in the first reading mode is generated. That is, it is possible to provide the user with image data that does not depend on the document conveyance speed while suppressing conveyance defects such as paper jams. Therefore, even if the document conveyance speed is varied, image data with the resolution desired by the user can be generated.

The image reading device includes a sonic sensor that outputs a sound wave to the document being transported by the transport section and detects an attenuation rate of the sound wave, and the control section is configured to control the control section when the document is being transported by the transport section. When the attenuation rate of the sound wave detected by the sonic sensor is less than the determination attenuation rate under the situation where the document is being conveyed by the conveyance unit, it is determined that the document being conveyed is thin, and the second reading mode is executed. It is preferable.

The thinner the document, the lower the attenuation rate of the sound waves detected by the sound wave sensor. Therefore, in the above configuration, when the attenuation rate of the sound waves detected by the sonic sensor is less than the determination attenuation rate, it can be determined that the document being conveyed is thin, so the second reading mode is implemented. That's what I do. By using the detection results from the sonic sensor in this way, the second reading mode can be automatically selected and executed.

In the image reading device, the sonic sensor is a sensor that detects whether or not a plurality of documents are being conveyed in an overlapping state; A double feed detection attenuation rate that is larger than the determination attenuation rate is provided as a threshold value, and the control unit is configured such that the attenuation rate of the sound wave detected by the sonic sensor under the situation where the document is being conveyed by the conveyance unit is the When the attenuation rate is equal to or higher than the judgment attenuation rate and less than the double feed detection attenuation rate, the first reading mode is executed, and the sound wave detected by the sonic sensor while the document is being conveyed by the conveyance unit is When the attenuation rate is equal to or higher than the double feed detection attenuation rate, it is preferable to stop conveying the document by the conveyance unit and to stop reading the image by the reading unit.

When a plurality of documents are conveyed in an overlapping state, the attenuation rate of the sound waves detected by the sonic sensor tends to be larger than when only one document is conveyed. The attenuation rate of sound waves when two thin documents are stacked on top of each other is greater than the attenuation rate of sound waves when one document that is not thin is being conveyed. Therefore, according to the above configuration, the double feed detection attenuation rate, which is a threshold value for determining whether or not a plurality of documents are being conveyed in an overlapping state, is determined to be larger than the determination attenuation rate. By using this double-feed detection attenuation rate, it can be determined whether a single document that is not thin is being conveyed, or whether a plurality of documents are being conveyed in an overlapping state. By employing such determination results, it becomes possible to drive the image reading device appropriately depending on the situation.

In the above image reading device, the transport unit includes a transport roller pair located upstream of the reading unit in the document transport direction, and a transport roller pair located upstream of the transport roller pair in the document transport direction, and the transport unit transports the original document. A feed-out roller that feeds the document toward the roller pair, and the sonic wave sensor is preferably disposed between the feed-out roller and the conveyance roller pair in the conveyance direction of the document.

According to the above configuration, it is possible to determine whether or not the thickness of the document being transported is thin on the upstream side of the reading section in the transport direction.
In the image reading device, the control unit changes the reading mode to be executed from the second reading mode to the first reading mode when a predetermined termination condition is satisfied in a situation where the second reading mode is selected. It is preferable to switch to the reading mode.

According to the above configuration, when implementation of the second reading mode becomes unnecessary, the mode can be switched from the second reading mode to the first reading mode.
In the above-mentioned image reading device, the control unit controls the next image reading when the setting information to end the second reading mode is input in a situation where the second reading mode is selected. It is preferable that the reading mode executed at the time is switched from the second reading mode to the first reading mode.

According to the above configuration, when setting information indicating that the second reading mode is not required is input, the first reading mode can be implemented when reading the next image.
In the above image reading device, the control unit sets the reading mode to be executed to the second reading mode when starting reading an image based on the next job in a situation where the second reading mode is selected. It is preferable to switch from the reading mode to the first reading mode.

According to the above configuration, when reading an image based on the next job, the first reading mode can be automatically implemented.
An image reading system for achieving the above purpose includes a transport unit that transports the original, and a reading unit that reads the image of the original transported by the transport unit, and the system has a transport unit that reads the image of the original that is transported by the transport unit, and the system is arranged on one side across the transport path along which the original is transported. an image reading device including a first reading portion located on the other side and a reading portion having a second reading portion located on the other side; and an external device capable of communicating with the image reading device. In the image reading system, when a document is being transported by the transport section, the reading section reads the image of the document at each predetermined timing, and by delaying the predetermined timing, the resolution of the image read by the reading section is adjusted. can be changed, and when generating image data of an image of the first resolution, specific setting information that is information indicating that the user is requested to transport the document at a low speed is input from the external device. In a state in which the document is not loaded, the transport unit transports the document at a first transport speed, and in a state in which the specific setting information is input from the external device, the transport unit transports the document at a speed lower than the first transport speed. When conveying a document at a second conveyance speed and generating image data of an image with a second resolution higher than the first resolution, whether the specific setting information is input from the external device. Regardless of whether or not the transport unit transports the document at a third transport speed that is lower than the first transport speed.
An image reading system for achieving the above purpose includes a transport unit that transports the original, and a reading unit that reads the image of the original transported by the transport unit, and the system has a transport unit that reads the image of the original that is transported by the transport unit, and the system is arranged on one side across the transport path along which the original is transported. an image reading device including a first reading portion located on the other side and a reading portion having a second reading portion located on the other side; and an external device capable of communicating with the image reading device. In the image reading system, it is possible to perform a process of lowering the resolution of the image read by the reading unit, and when generating image data of an image with a first resolution, the user can transport the document at a low speed from the external device. In a state where specific setting information, which is information indicating that a document is requested, is not input, the conveying section conveys the document at the first conveying speed, and when the specific setting information is input from the external device, the document is conveyed at the first conveying speed. In this state, the conveyance section conveys the document at a second conveyance speed that is lower than the first conveyance speed, and transfers image data of an image at a second resolution that is higher than the first resolution. When generating the document, the conveyance section conveys the document at a third conveyance speed that is lower than the first conveyance speed, regardless of whether or not the specific setting information is input from the external device.
An image reading control method for achieving the above purpose includes reading an image of a document conveyed by a conveyance section that conveys the document using a reading section, and generating image data that is data of the image read by the reading section in a control section. An image reading control method comprising: causing the reading section to read an image of the document at predetermined timings; and changing the resolution of image data generated by the control section by delaying the timing. , when specific setting information indicating that the user requests the document to be conveyed at a low speed is not input to the control section, causing the conveyance section to convey the document at a first conveyance speed; , causing the control unit to generate image data of an image with a first resolution, and when the specific setting information is input, at a second conveyance speed that is lower than the first conveyance speed. a step of causing the conveyance section to convey the document and causing the control section to generate image data of the image at the first resolution; a step of causing the conveyance section to convey the document at a third conveyance speed that is a low speed, and causing the control section to generate image data of an image having a second resolution that is higher than the first resolution; If setting information has been input, the method includes the step of causing the conveyance section to convey the document at the third conveyance speed, and causing the control section to generate image data of the image at the second resolution.
An image reading control method for achieving the above purpose includes reading an image of a document conveyed by a conveyance section that conveys the document using a reading section, and generating image data that is data of the image read by the reading section in a control section. An image reading control method comprising: changing the resolution of image data generated by the control unit by lowering the resolution of the image read by the reading unit; and requiring a user to transport the document at a low speed. If specific setting information, which is information indicating that a step of causing the control unit to generate the document; and when the specific setting information is input, causing the transport unit to transport the document at a second transport speed that is lower than the first transport speed; a step of causing the control unit to generate image data of an image with a resolution of a step of causing the control section to convey the document and causing the control section to generate image data of an image at a second resolution that is higher than the first resolution, and when the specific setting information is input, The method further includes the step of causing the conveyance unit to convey the document at the third conveyance speed, and causing the control unit to generate image data of the image at the second resolution.

FIG. 1 is a perspective view showing a schematic configuration of a first embodiment of an image reading device. FIG. 3 is a side view showing a conveying device and its peripheral members of the image reading device. A table for explaining a plurality of first reading modes. FIG. 2 is a block diagram illustrating the functional configuration of the image reading device. 2 is a flowchart illustrating a processing procedure when reading an image with the same image reading device. 7 is a flowchart illustrating a processing procedure when reading an image with the image reading device of the second embodiment. FIG. 7 is a block diagram illustrating the functional configuration of an image reading device according to a third embodiment. 2 is a flowchart illustrating a processing procedure when reading an image with the same image reading device.

(First embodiment)
A first embodiment of an image reading device will be described below with reference to FIGS. 1 to 5.
As shown in FIG. 1, the image reading device 11 of this embodiment includes a housing 12 and a cover member 13 rotatably supported by the housing 12. This cover member 13 is provided with a user interface 50 of the 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 specifying button 51A that is operated when instructing to read an image in a second reading mode, which will be described later. Further, one of the lamps 52 is a specifying lamp 52A that is turned on when the specifying button 51A is in the on state. Note that the identification lamp 52A is turned off when the identification button 51A is in the off state.

Further, as shown in FIG. 2, the image reading device 11 is provided with a setting section 14 in which a document MS whose image has not yet been read is set. When a plurality of originals MS are set on the setting section 14, the originals MS are stacked on the setting section 14. Further, inside the casing 12, a transport device 20 serving as a transport unit that transports the original MS, and a reading device 30 that reads an image of the original MS being transported by the transport device 20 are provided. Then, the originals MS set in the setting section 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 whose image has been completely read is discharged from the housing 12.

As shown in FIG. 2, the conveyance device 20 includes a feed roller 21, a pair of feed rollers 22, a pair of conveyance rollers 23, and a pair of discharge rollers 24, which are arranged in order from upstream to downstream in the conveyance direction of the document MS. There is. Further, the conveyance device 20 includes a delivery motor 25 and a conveyance motor 26 as drive sources for conveying the document MS. The driving force from the feed motor 25 is transmitted to the feed roller 21, and the driving force from the conveyance motor 26 is transmitted to the feed roller pair 22, the conveyance roller pair 23, and the discharge roller pair 24.

The feed roller 21 feeds the lowest original MS among the plurality of originals MS set in the setting section 14 into the housing 12 . Further, a guide member 27 is arranged above the feed roller 21. This guide member 27 restricts the entry of documents other than the lowest document MS into the housing 12.

The feed roller pair 22 includes a drive roller 221 that is drivingly connected to the transport motor 26 and a driven roller 222 to which the driving force from the transport motor 26 is transmitted through the drive roller 221. Then, as the drive roller 221 and the driven roller 222 rotate, the document MS is held between the rollers 221 and 222, and the document MS is sent toward the transport roller pair 23.

The driven roller 222 of the sending roller pair 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 original documents MS are sent into the casing 12 from the set section 14 in an overlapping state, only one original document MS is sent downstream in the conveying direction by the pair of sending rollers 22. In this respect, the two rollers 221 and 222 forming the pair of feed rollers 22 function as “feed rollers” that feed the document MS toward the pair of transport rollers 23.

The conveyance roller pair 23 is disposed upstream in the conveyance direction on the right side in the figure of the reading device 30. The transport roller pair 23 includes a drive roller 231 that is drivingly connected to the transport motor 26 and a driven roller 232 to which the driving force from the transport motor 26 is transmitted through the drive roller 231. Then, as the driving roller 231 and the driven roller 232 rotate, the original MS is held between the rollers 231 and 232, and the original MS is conveyed toward the reading device 30.

The ejection roller pair 24 is disposed on the left side of the reading device 30 in the figure, downstream in the conveyance direction. The discharge roller pair 24 includes a drive roller 241 that is drivingly connected to the transport motor 26 and a driven roller 242 to which the driving force from the transport motor 26 is transmitted through the drive roller 241. Then, as the driving roller 241 and the driven roller 242 rotate, the original MS is held between the rollers 241 and 242, and the original MS is ejected from the housing 12.

The reading device 30 has two reading sections 31 and 32 arranged on both sides of the upper and lower sides of the document MS transported along the transport path. Among the reading sections 31 and 32, the reading section located on the lower side is the first reading section 31, and the reading section located on the upper side is the second reading section 32. That is, the first reading unit 31 reads an image on one side of the original MS (the lower side in the figure), and the second reading unit 32 reads the image on the other side (the upper side in the figure) of the original MS. Note that, as the reading unit, for example, a contact image sensor module (CISM) can be used. Of course, other modules than the CISM may be employed as the reading section.

Note that, as shown in FIG. 2, an edge detection sensor 600 that detects the edge of the document MS is provided between the reading device 30 and the pair of conveyance rollers 23 in the conveyance direction of the document MS.
Further, a double feed detection sensor 610 is provided between the feed roller pair 22 and the conveyance roller pair 23 in the conveyance direction of the document MS to detect that a plurality of documents MS are conveyed in an overlapping state. ing. This double feed detection sensor 610 is a sonic sensor, and has an output section 611 that outputs a sound wave and an input section 612 into which the sound wave output from the output section 611 is input. One of the output unit 611 and the input unit 612 is arranged above the original MS transported along the transport route in the figure, and the output unit 611 and the input unit 612 are arranged lower in the figure than the original MS transported along the transport route. The other of the section 611 and the input section 612 is arranged. In the example shown in FIG. 2, the input section 612 is arranged in the upper part of the figure, and the output part 611 is arranged in the lower part of the figure.

Then, the double feed detection sensor 610 detects the attenuation rate α of the sound wave. When the output value of the sound wave output from the output section 611 is "X1" and the input value of the sound wave input to the input section 612 is "X2", the attenuation rate α is determined by the following relational expression (Formula 1) This is a value that can be calculated using

α = (X1-X2)/X1...(Formula 1)
By the way, in the image reading device 11 of this 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 an image reading mode, can be selected by the user's operation of the user interface 50 or by the user's operation of an external device communicating with the image reading device 11.

In addition, in the image reading device 11 that causes the reading sections 31 and 32 to read the image of the document MS being conveyed, the lower the conveyance speed of the document MS, the more image data that is image data with a higher resolution is generated. Ru. Therefore, the first reading mode for providing high-resolution image data to the user can also be said to be a mode in which the document MS is conveyed at a speed that correlates with the resolution requested by the user.

FIG. 3 shows an example of a table showing a plurality of (three in this case) first reading modes. As shown in FIG. 3, the first mode is a reading mode in which the document MS is transported at a high speed and image data with low resolution is generated. The second mode is a reading mode in which the conveyance speed of the document MS is medium and image data of medium resolution is generated. The third mode is a reading mode in which the transport speed of the document MS is low and high resolution image data is generated.

When instructing the image reading device 11 to read an image, the user can select one reading mode (ie, the first reading mode) from among the three modes described above.

Here, the image reading device 11 of this embodiment is capable of reading images of various manuscripts MS having different thicknesses. The thinner the document MS is, the more likely conveyance defects such as paper jams occur during conveyance. 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. This identification button 51A is a button that is turned on when reading an image of a document MS that is likely to have transport defects during transportation, such as a thin document MS. When the identification button 51A is turned on by a user's operation, specific setting information, which is information related to a specific user's operation, is input to the control device 60 (see FIG. 4) as a control unit of the image reading device 11. and a second reading mode different from the first reading mode is implemented. Note that the "specific user operation" here refers to a button operation by the user to turn on the specific button 51A.

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

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

In addition, if the specific button 51A is turned on under a situation where the user has selected implementation of the third mode, that is, under a situation where the user requests a high resolution, the second mode shown below reading mode is implemented.
- The original MS is transported at a lower speed than when implementing the third mode.
- Generate image data with the same resolution as in the third mode.

By implementing such a second reading mode, the document MS is conveyed at a low speed, so even when reading an image of a thin document MS, occurrence of a conveyance failure of the document MS is suppressed. Ru. Moreover, even if the document MS is transported 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, in the first reading mode selected by the user. The resolution will be the same.

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

The transport control unit 61 controls the transport device 20. That is, when an instruction to start conveying the document MS, that is, an instruction to read an image of the document MS is input, the conveyance control section 61 rotates the feed roller 21 by driving the feed motor 25 . As a result, one document MS is sent into the housing 12 from the setting section 14. Then, when the document MS transported by the rotation of the feed roller 21 comes to be held between the two rollers 221 and 222 forming the feed roller pair 22, the conveyance control unit 61 stops the drive of the feed motor 25. .

Further, the conveyance control unit 61 rotates each roller 221 , 231 , 241 , 222 , 232 , 242 of the feed roller pair 22 , the conveyance roller pair 23 , and the discharge roller pair 24 by driving the conveyance motor 26 . Note that the timing at which the transport motor 26 starts driving may be the same as the timing at which the delivery motor 25 starts driving, or may be after the timing at which the delivery motor 25 starts driving. Then, the conveyance control unit 61 stops driving the conveyance motor 26 after the timing when the trailing edge of the document MS passes the pair of discharge rollers 24 .

Note that information regarding the conveyance speed of the document MS is inputted to the conveyance control section 61 from the mode selection section 66. Then, the conveyance control unit 61 controls the drive of the conveyance motor 26 so as to convey the document MS at a speed based on the input information.

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

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

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

Here, the acquisition of images from the original MS is realized by causing the reading units 31 and 32 to read images at predetermined timings while the original MS is being transported. Therefore, the resolution of the images acquired by the reading units 31 and 32 increases as the transport speed of the document MS decreases. Therefore, the resolution of the image acquired when the second reading mode is implemented 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 image data of the same resolution.

In addition, when implementing the second reading mode, the data generation unit 64 generates an image from the reading unit 31 so that it can obtain an image with a low resolution (that is, an image with a resolution assuming that the first reading mode is implemented). , 32 may be controlled. For example, by delaying the above-mentioned predetermined timing, it is possible to obtain an image with a resolution lower than the resolution corresponding to the conveyance speed of the document MS. In this case, the data generation unit 64 can generate image data with the resolution requested by the user even if the conveyance speed of the document MS is low. That is, there is no need to perform processing to lower the resolution of the acquired image.

The data output section 65 transmits the image data generated by the data generation section 64 to an external device.
Next, with reference to the flowchart shown in FIG. 5, a processing procedure for reading an image of the document MS will be described.

As shown in FIG. 5, in a situation where any one of the first mode, second mode, and third mode is selected, it is determined whether the identification button 51A is in the on state. (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 moves to step S14, which will be described later. On the other hand, if 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 moves to the next step S14. Ru.

In step S14, reading of the image is started by starting implementation of the selected reading mode. For example, when the identification button 51A is in the off state and the second mode is selected, the document MS is transported by the transport device 20 at a medium speed, and image data with a medium resolution is generated. Further, when the identification button 51A is in the on state and the second mode is selected, the document MS is transported at a low speed by the transport device 20, and image data of an image with a medium resolution is generated.

While the image is being read in this way, it is determined whether the attenuation rate α detected by the double feed detection sensor 610 is equal to or greater than the double feed detection attenuation rate αTh1 (step S15). . The double feed detection attenuation rate αTh1 is a threshold value for determining whether or not a plurality of documents MS are being conveyed in an overlapping state. For example, when only one document MS of normal thickness is being transported and this document MS is located between the output section 611 and the input section 612 of the double feed detection sensor 610, the attenuation rate α is defined as "standard attenuation". %. In this case, the double feed detection attenuation rate αTh1 is set to a value larger than the standard attenuation rate.

If the attenuation rate α is greater than or equal to the double feed detection attenuation rate αTh1 (step S15: YES), it can be determined that multiple originals MS are being conveyed in an overlapping state, so image reading is stopped. (Step S16). In this case, conveyance of the document MS is stopped, and the user interface 50 notifies the user of the error. After that, this process ends.

On the other hand, if the attenuation rate α is less than the double feed detection attenuation rate αTh1 (step S15: NO), it can be determined that only one document MS is being conveyed, so image reading continues. Then, it is determined whether reading of the image is completed (step S17).

Note that the trailing edge of the document MS can be detected based on the results of reading by the reading sections 31 and 32. That is, based on the reading results by the reading sections 31 and 32, it can be determined whether the rear end of the document MS is located downstream of the reading sections 31 and 32 in the conveyance direction. Then, when the trailing edge of the document MS is located downstream of the reading units 31 and 32 in the conveyance direction, it can be determined that the reading of the image of the document MS is completed.

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

In step S18, it is determined whether there is a next document MS whose image should be read. If there is a next original MS (step S18: YES), the process moves to step S14 described above, and conveyance of the next original MS is started. In this case, the transport speed of the next original MS is equal to the transport speed of the previous original MS. On the other hand, if there is no next document MS (step S18: NO), the image data generated by the data generation section 64 is outputted by the data output section 65 (step S19), and this process is ended.

Note that when sequentially reading images of a plurality of documents MS, the user may operate the identification button 51A during the continuous reading of a series of images. In the image reading device 11 of this embodiment, such operation of the identification button 51A by the user is disabled. That is, even if the specifying button 51A is operated during continuous image reading, the conveyance speed of one document is made equal to the conveyance speed of the document following the one document. In other words, the operation of the specifying button 51A is valid until the start of continuous reading of a series of images, that is, before the start of the process described using FIG. 5.

As described above, according to the image reading device 11 of this embodiment, the following effects can be obtained.
(1) When an instruction is given to read an image in a situation where the identification button 51A is in an off state, the first reading mode is executed. That is, if the user recognizes that the thickness of the document MS set in the setting section 14 is not thin, the user instructs the image reading device 11 to read the image without turning on the identification button 51A. Ru. 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 image resolution 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 of the resolution desired by the user.

On the other hand, when an instruction to read an image is given in a situation where the identification button 51A is in an on state, the second reading mode is implemented. That is, if the user recognizes that the document MS set in the setting section 14 is thin, the identification button 51A is turned on and the user instructs the image reading device 11 to read the image. . At this time, although the document MS is transported at a lower speed than in the first reading mode, image data with the same resolution as in the first reading mode is generated. That is, it is possible to provide the user with image data that does not depend on the conveyance speed of the document MS while suppressing conveyance defects such as paper jams. Therefore, even when the transport speed of the document MS is varied, image data with the resolution desired by the user can be generated.

(Second embodiment)
Next, a second embodiment of the image reading device 11 will be described with reference to FIG. 6. Note that 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 explanation, parts that are different from the first embodiment will be mainly explained, and the same reference numerals will be given to the same member configurations as in the first embodiment, and redundant explanation will be omitted. do.

FIG. 6 shows a flowchart illustrating the processing procedure when reading the image of the document MS.
As shown in FIG. 6, in a situation where any one of the first mode, second mode, and third mode is selected, it is determined whether the identification button 51A is in the on state. (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 moves to step S14, which will be described later. On the other hand, if the identification button 51A is in the on state (step S11: YES), the second reading mode is selected (step S13), and the process moves to the next step S14.

In step S14, reading of the image is started by starting implementation of the selected reading mode. When the attenuation rate α detected by the double-feed detection sensor 610 becomes equal to or higher than the double-feed detection attenuation rate αTh1 while the image is being read in this way (step S15: YES), multiple Since it can be determined that the documents MS are being conveyed in an overlapping state, image reading is stopped (step S16). In this case, conveyance 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 ends.

On the other hand, if the attenuation rate α is less than the double feed detection attenuation rate αTh1 (step S15: NO), it can be determined that only one document MS is being conveyed, so image reading continues. If the reading of the image of the original MS is not completed yet (step S17: NO), the process moves to the aforementioned step S15, and reading of the image of the original MS is continued. On the other hand, if reading of the image of the original MS has already been completed (step S17: YES), the process moves to the next step S18.

In step S18, it is determined whether there is a next document MS whose image should be read. If there is no next document MS (step S18: NO), the image data generated by the data generation section 64 is outputted by the data output section 65 (step S19), and this process is ended.

On the other hand, if there is a next document MS (step S18: YES), the process moves to step S11 described above, and conveyance of the next document MS is started. That is, if the specifying button 51A is changed during reading of the previous image, although the transport speed of the document MS is changed from the time of reading the current image, the resolution of the generated image based on the image mode will be the same as the previous image. The resolution is the same as when reading the image.

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

On the other hand, if the identification button 51A is switched from the on state to the off state during the reading of the previous image, the second reading mode was executed when the previous image was read, but when the current image is read, Sometimes a first reading mode is implemented. In other words, if the setting information to end the second reading mode is input while the second reading mode is selected, the mode to be executed is changed to the second reading mode at the start of the current image reading. The reading mode is 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 user's operation of the identification button 51A corresponds to the "predetermined termination condition."

As described above, according to the image reading device 11 of this embodiment, in addition to the same effect as effect (1) in the first embodiment, the following effects can be further obtained.
(2) When sequentially reading images of multiple originals MS, if the identification button 51A is turned on while one of the originals is being conveyed, the image of one original The first reading mode continues to be performed until the reading is completed. That is, while one document is being conveyed, the reading mode is not changed and the conveyance speed of the same document is not changed. Therefore, it is possible to suppress an increase in control load caused by switching the reading mode during image reading.

Thereafter, when reading the image of the next document, the second reading mode is used instead of the first reading mode. That is, when reading images of originals after the first original, the originals are transported at a low speed. Moreover, since it is the second reading mode, image data with the same resolution as in the first reading mode is generated even if the document is conveyed at a low speed. Therefore, when reading images of originals after the first original, the original MS is transported at a low speed to suppress the occurrence of transport failures of the original MS, while still providing the user with image data that does not depend on the transport speed. can be provided.

(3) However, if the identification button 51A is shifted from the on state to the off state while the image of the document MS is being read in the second reading mode, the execution of the second reading mode is disabled. It can be determined that the termination condition has been met. Therefore, when reading the image of the next document MS, the first reading mode will be implemented, and the document MS will be conveyed at the speed specified by the first reading mode. Therefore, when the second reading mode becomes unnecessary, the second reading mode can be appropriately switched to the first reading mode.

(Third embodiment)
Next, a third embodiment of the image reading device 11 will be described with reference to FIGS. 7 and 8. Note that in the third embodiment, the thickness of the document MS that is the object of image reading is automatically detected, and based on the detection result, it is determined whether to implement the second reading mode or the first reading mode. This embodiment differs from the first and second embodiments in the point of determination. Therefore, in the following description, the parts that are different from the first and second embodiments will be mainly explained, and the same reference numerals will be given to the same member configurations as the first and second embodiments. Therefore, duplicate explanations will be omitted.

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

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

Here, an example of a method for determining whether or not the thickness of the document MS being transported is thin will be described.
That is, when the document MS is located between the output section 611 and the input section 612 of the double feed detection sensor 610, the sound waves output from the output section 611 pass through the document MS and are input to the input section 612. At this time, when the sound waves pass through the document MS, the thinner the document MS is, the less the sound waves are attenuated. That is, the thickness of the document MS can be estimated to some extent based on the attenuation rate α of the sound wave. Therefore, a judgment attenuation rate αTh2 is provided as an attenuation rate that serves as a criterion for determining whether or not the thickness of the document MS is thin, and when the attenuation rate α is less than the judgment attenuation rate αTh2, it is determined that the thickness of the document MS being conveyed is thin. I'm trying to judge.

Note that a plurality of thin documents MS may be conveyed in an overlapping state. For example, when two documents MS overlap, the attenuation rate α detected by double feeding detection sensor 610 is larger than the attenuation rate when one document MS, which is not thin, is being conveyed. Therefore, the double feed detection attenuation rate αTh1 is set to a value larger than the attenuation rate when one document MS that is not thin is being conveyed. Thereby, when the attenuation rate α is greater than or equal to the determination attenuation rate αTh2 and less than the double feed detection attenuation rate αTh1, it can be determined that the thickness of the document MS being conveyed is not thin. On the other hand, when the attenuation rate α is greater than or equal to the double feed detection attenuation rate αTh1, it can be determined that multiple documents MS are being conveyed in an overlapping state.

Next, with reference to the flowchart shown in FIG. 8, a processing procedure for reading an image of the document MS will be described.
As shown in FIG. 8, conveyance of the original MS is started in the first reading mode according to the image resolution requested by the user (step S31). Then, when the document MS comes to be located between the output section 611 and the input section 612 of the double feed detection sensor 610, the attenuation rate α detected by the double feed detection sensor 610 is less than the determined attenuation rate αTh2. It is determined whether or not (step S32). That is, in step S32, it is determined whether or not the thickness of the document MS being conveyed is thin.

If the attenuation rate α is less than the determined attenuation rate αTh2 (step S32: YES), it is determined that a thin document MS is being conveyed, and the reading mode is changed from the first reading mode to the second reading mode. It is switched (step S33). As a result, the conveyance speed of the document MS is reduced. When the second reading mode is implemented in this manner, the identification lamp 52A is turned on. Then, the process moves to the next step S34.

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

On the other hand, in step S32, if the attenuation rate α is equal to or greater than the determination attenuation rate αTh2 (NO), it can be determined that the thickness of the document MS being conveyed is not thin. It is determined whether the detected attenuation rate αTh1 is less than (step S35). In this step S35, it is determined whether a plurality of documents MS are being conveyed in an overlapping state. Then, if the attenuation rate α is less than the double feed detection attenuation rate αTh1 (step S35: YES), it can be determined that one document MS that is not thin is being conveyed, so that the process is performed in the steps described above. The process moves to S34. In this case, the images are read by the reading sections 31 and 32 while the original MS is transported at the transport speed specified in the first reading mode. Note that when the document MS is being transported in the first reading mode as described above, the identification lamp 52A is turned off.

On the other hand, if the attenuation rate α is greater than or equal to the double feed detection attenuation rate αTh1 (step S35: NO), it can be determined that multiple originals MS are being conveyed in an overlapping state, so image reading is stopped. (Step S36). In this case, conveyance of the document MS is stopped, and the user interface 50 notifies the user of the error. After that, this process ends.

In step S37, reading of the image of the document MS being conveyed is started. Then, it is determined whether the attenuation rate α detected by the double-feed detection sensor 610 while the image is being read in this way is less than the double-feed detection attenuation rate αTh1 (step S38). . If the attenuation rate α is greater than or equal to the double feed detection attenuation rate αTh1 (step S38: NO), it can be determined that multiple originals MS are being conveyed in an overlapping state, and the process proceeds to step S36 described above. will be migrated. That is, when it is detected that a plurality of documents MS are being conveyed in an overlapping state, the image reading in progress is stopped.

On the other hand, if the attenuation rate α is less than the double feed detection attenuation rate αTh1 (step S38: YES), it is determined whether reading of the image of the document MS being conveyed has been completed (step S39). If the image reading is not yet completed (step S39: NO), the process moves to the aforementioned step S38, and the image reading is continued. On the other hand, if the image reading has been completed (step S39: YES), the process moves to the next step S40.

In step S40, it is determined whether there is a next document MS whose image should be read. If there is a next original MS (step S40: YES), the process moves to step S31 described above, and conveyance of the next original MS is started. In this case, even after the image has been read in the second reading mode, conveyance of the original MS in the first reading mode is started. That is, the completion of reading the image of the document MS corresponds to a "predetermined end condition" for switching the mode from the second reading mode to the first reading mode.

On the other hand, if there is no next document MS (step S40: NO), the image data generated by the data generation section 64 is outputted by the data output section 65 (step S41), and this processing is ended.

As described above, according to the image reading device 11 of this embodiment, the following effects can be obtained.
(4) When the document MS being transported by the transport device 20 is not thin, the first reading mode is implemented. Note that when the user instructs the image reading device 11 to read the image of the document MS, the user can select the resolution of the image based on the generated image data. Therefore, it is possible to provide the user with image data that is image data with the resolution desired by the user.

On the other hand, when the document MS being transported by the transport device 20 is thin, the second reading mode is implemented. In this case, although the document MS is transported at a slower speed than in the first reading mode, image data with the same resolution as in the first reading mode is generated. That is, it is possible to provide the user with image data that does not depend on the conveyance speed of the document MS while suppressing conveyance defects such as paper jams. Therefore, even when the transport speed of the document MS is varied, image data with the resolution desired by the user can be generated.

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

(6) The double feed detection attenuation rate αTh1, which is a threshold value for determining whether or not multiple documents MS are being conveyed in an overlapping state, is determined to be larger than the determination attenuation rate αTh2. By using this double feed detection attenuation rate αTh1, it is possible to determine whether only one document, which is not thin, is being conveyed, or whether a plurality of documents are being conveyed in an overlapping state. By employing such determination results, it is possible to drive the image reading device 11 appropriately depending on the situation.

(7) Note that the double feed detection sensor 610 is arranged between the pair of conveyance rollers 23 and the pair of delivery rollers 22 in the conveyance direction. Therefore, before the leading edge of the document MS reaches the position of the reading device 30, it can be determined whether or not the thickness of the document MS being conveyed is thin. Therefore, before the reading units 31 and 32 actually start reading images, 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. can do. Therefore, it is not necessary to change the conveyance speed of the document MS while the image is actually being read by the reading sections 31 and 32.

(8) Then, when the conveyance of the original MS in the second reading mode is completed, the condition for ending the second reading mode is satisfied, and therefore the conveyance of the original MS in the first reading mode is started. Therefore, when reading the images of multiple originals MS continuously, if some of each original MS is a thin original, the same original is transported at low speed only when reading the image of the thin original. can do. Therefore, even when reading an image of a document that is not thin, a decrease in throughput of the image reading device 11 can be suppressed compared to when the document is conveyed at a low speed.

Note that each of the above embodiments may be modified as follows.
- In the third embodiment, if the double feed detection sensor 610 is arranged upstream of the reading device 30 in the conveyance direction, the double feed detection sensor 610 is arranged between the feed roller pair 22 and the conveyance roller pair 23 in the conveyance direction. It may be placed in a position other than between. For example, the double feed detection sensor 610 may be arranged between the reading device 30 and the pair of conveyance rollers 23 in the conveyance direction.

・If the sensor is capable of detecting whether the document MS being conveyed is thin or not, and whether multiple document MSs are being conveyed in an overlapping state, other sensors other than the sonic sensor can be used for double feeding. It may also be applied as a detection sensor.

- The value of the current flowing through the transport motor 26 when transporting the document MS increases as the load applied to the pair of rollers rotating with the transport motor 26 as a drive source increases. This load changes depending on the thickness of the document MS being conveyed and the number of overlapping documents MS. Therefore, in the second embodiment, instead of the attenuation rate α detected by the double feed detection sensor 610, it is determined whether or not the thickness of the document MS being transported is thin based on the value of the current flowing through the transport motor 26. You may also do so. Similarly, in each of the first and second embodiments, it may be determined based on the value of the current flowing through the transport motor 26 whether or not a plurality of documents MS are being transported in an overlapping state.

- 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 that can communicate with the image reading device 11. You can do it like this. In this case, the second reading mode will be implemented when the control device 60 of the image reading device 11 receives specific setting information that is information related to user operations from an external device.

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

- In each of the above embodiments, the second reading mode is implemented as necessary even when the third mode is selected by the user, but the third mode is not limited to this. The second reading mode may not be executed when it is selected. In this case, for example, in each of the first and second embodiments, when the third mode is selected, whether the identification button 51A is in the on state or the off state, the third mode is selected. 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 mode is selected. mode will be implemented.

- In each of the first and second embodiments, even if the identification button 51A is in the on state, the attenuation rate α of the sound wave detected by the double feed detection sensor 610 is equal to or higher than the determination attenuation rate αTh2. Sometimes, the first reading mode may be implemented. Further, the second reading mode may be implemented 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. good.

Further, when the identification button 51A is in the off state, the first reading mode is executed 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. It's okay.

- The reading device 30 may be configured to include only one of the first reading section 31 and the second reading section 32.
- The transport device 20 may be configured without the delivery motor 25. In this case, the feed roller 21 may be rotated by driving the conveyance motor 26.

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

DESCRIPTION OF SYMBOLS 11... Image reading device, 20... Conveyance device as a conveyance part, 221, 222... Roller which functions as a sending-out roller, 23... Conveyance roller pair, 31, 32... Reading part, 60... Control device as a control part, 600... An edge detection sensor composed of a sound wave sensor, MS...document, α...attenuation rate, αTh1...double feed detection attenuation rate, αTh2...judgment attenuation rate.

Claims (8)

A transport unit that can transport the original;
A reading section that reads an image of a document conveyed by the conveyance section, the first reading section being disposed on one side across the conveyance path along which the document is conveyed, and the second reading section being disposed on the other side. the reading section having a reading section;
a control unit that generates image data that is data of an image read by the reading unit,
The reading unit is configured to read an image of the original at predetermined timing when the original is being transported by the transporting unit,
The control unit includes:
By delaying the predetermined timing, it is possible to make the resolution of the image read by the reading section lower than the resolution according to the conveyance speed of the document,
When generating image data of an image of the first resolution,
If specific setting information indicating that the user is requested to transport the document at a low speed is not input, the document is transported by the transport section at the first transport speed, and the document is transported at the predetermined timing. generating image data of the image at the first resolution by causing the reading unit to read the image of the document at each time;
When the specific setting information is input, the document is transported by the transport section at a second transport speed that is lower than the first transport speed, and when the specific setting information is not input. generating image data of the image at the first resolution by causing the reading unit to read the image of the document by delaying the predetermined timing compared to
When generating image data of an image with a second resolution that is higher than the first resolution,
Regardless of whether or not the specific setting information is input, the document is conveyed by the conveyance section at a third conveyance speed that is lower than the second conveyance speed, and the document is conveyed at each of the predetermined timings. An image reading device characterized in that image data of the image of the second resolution is generated by causing the reading unit to read the image of the second resolution. A transport unit that can transport the original;
A reading section that reads an image of a document conveyed by the conveyance section, the first reading section being disposed on one side across the conveyance path along which the document is conveyed, and the second reading section being disposed on the other side. the reading section having a reading section;
a control unit that generates image data that is data of an image read by the reading unit,
The control unit includes:
It is possible to perform processing to lower the resolution of the image read by the reading unit,
When generating image data of an image of the first resolution,
If specific setting information indicating that the user is requested to transport the original at a low speed is not input, the original is transported by the transport section at the first transport speed, and the image of the original is generating image data of the image at the first resolution by causing the reading unit to read the image;
In a state where the specific setting information is input, the document is conveyed by the conveyance section at a second conveyance speed that is lower than the first conveyance speed, and the image of the document is read by the reading section. , generating image data of the image at the first resolution by performing processing to lower the resolution of the image;
When generating image data of an image with a second resolution that is higher than the first resolution,
Regardless of whether or not the specific setting information has been input, the document is conveyed by the conveyance section at a third conveyance speed that is lower than the second conveyance speed, and the image of the document is transferred to the reading section. An image reading device characterized in that the image reading device generates image data of the image of the second resolution by reading the image. Equipped with a user interface,
The image reading device according to claim 1 or 2, wherein the specific setting information is input to the control unit by operating the user interface. Can communicate with external devices,
The image reading device according to any one of claims 1 to 3 , wherein the specific setting information is input to the control unit by operating the external device. a transport unit that transports the original; a first reading unit that reads an image of the original transported by the transport unit, the first reading unit being disposed on one side across a transport path along which the original is transported; an image reading device comprising: a reading section having a second reading section disposed on the other side;
An image reading system comprising: an external device capable of communicating with the image reading device;
When a document is being transported by the transport section, the reading section reads an image of the document at predetermined timings;
By delaying the predetermined timing, it is possible to make the resolution of the image read by the reading section lower than the resolution according to the conveyance speed of the document,
When generating image data of an image of the first resolution,
In a state where specific setting information indicating that the user is requested to transport the original at a low speed from the external device is not input, the transport unit transports the original at a first transport speed, generating image data of the image at the first resolution by causing the reading unit to read the image of the document at each of the predetermined timings;
In a state where the specific setting information is input from the external device, the conveying section conveys the document at a second conveying speed that is lower than the first conveying speed, and the specific setting information is input. generating image data of the image at the first resolution by causing the reading unit to read the image of the document by delaying the predetermined timing compared to when the image is not read;
When generating image data of an image with a second resolution that is higher than the first resolution,
Regardless of whether or not the specific setting information is input from the external device, the conveyance section conveys the document at a third conveyance speed that is lower than the second conveyance speed, and the document is conveyed at the predetermined timing. An image reading system characterized in that image data of an image of the second resolution is generated by causing the reading section to read an image of the document at each time. a transport unit that transports the original; a first reading unit that reads an image of the original transported by the transport unit, the first reading unit being disposed on one side across a transport path along which the original is transported; an image reading device comprising: a reading section having a second reading section disposed on the other side;
An image reading system comprising: an external device capable of communicating with the image reading device;
It is possible to perform processing to lower the resolution of the image read by the reading unit,
When generating image data of an image of the first resolution,
In a state where specific setting information indicating that the user is requested to transport the original at a low speed from the external device is not input, the transport unit transports the original at a first transport speed, generating image data of the image at the first resolution by causing the reading unit to read the image of the document;
In a state in which the specific setting information is input from the external device, the conveyance section conveys the document at a second conveyance speed that is lower than the first conveyance speed, and reads the image of the document. generating image data of the image at the first resolution by causing the image to be read by the computer and performing processing to lower the resolution of the image;
When generating image data of an image with a second resolution that is higher than the first resolution,
Regardless of whether or not the specific setting information is input from the external device, the conveyance section conveys the document at a third conveyance speed that is lower than the second conveyance speed, and displays the image of the document. An image reading system characterized in that image data of the image of the second resolution is generated by causing the reading unit to read the image data. An image reading control method that causes a reading unit to read an image of a document conveyed by a conveyance unit that conveys the document, and causing a control unit to generate image data that is data of the image read by the reading unit, the method comprising:
a step of causing the reading unit to read the image of the document at each predetermined timing;
delaying the predetermined timing to make the resolution of the image data generated by the control unit lower than the resolution based on the conveyance speed of the document;
When causing the control unit to generate image data of an image of the first resolution, specific setting information indicating that the user is requested to transport the document at a low speed is not input to the control unit. In this case, the image data of the image of the first resolution is transferred to the image data of the image of the first resolution by causing the conveyance section to convey the document at a first conveyance speed and causing the reading section to read the image of the document at each of the predetermined timings. A step of causing the control unit to generate the
When causing the control unit to generate image data of an image with the first resolution, if the specific setting information is input, the controller generates the image data at a second conveyance speed that is lower than the first conveyance speed. By causing the conveyance unit to convey the document and causing the reading unit to read the image of the document by delaying the predetermined timing compared to the case where the specific setting information is not input, the image of the document is read by the reading unit. a step of causing the control unit to generate image data of the image;
When causing the control unit to generate image data of an image with a second resolution that is higher than the first resolution, if the specific setting information is not input, The image data of the image of the second resolution is transferred to the image data of the image of the second resolution by causing the conveyance section to convey the document at a third conveyance speed that is a low speed, and causing the reading section to read the image of the document at each of the predetermined timings. A step of causing the control unit to generate the
When causing the control unit to generate image data of an image of the second resolution, if the specific setting information is input, the document is conveyed by the conveyance unit at the third conveyance speed, and An image reading control method comprising the step of causing the control unit to generate image data of the image at the second resolution by causing the reading unit to read an image of the document at each timing. An image reading control method that causes a reading unit to read an image of a document conveyed by a conveyance unit that conveys the document, and causing a control unit to generate image data that is data of the image read by the reading unit, the method comprising:
a lowering step of lowering the resolution of image data generated by the control unit by lowering the resolution of the image read by the reading unit;
When causing the control unit to generate image data of an image of the first resolution, specific setting information indicating that the user is requested to transport the document at a low speed is not input to the control unit. in this case, causing the control unit to generate image data of the image at the first resolution by causing the conveyance unit to convey the document at a first conveyance speed and causing the reading unit to read the image of the document. and,
When causing the control unit to generate image data of an image with the first resolution, if the specific setting information is input, the controller generates the image data at a second conveyance speed that is lower than the first conveyance speed. a step of causing the control unit to generate image data of the image at the first resolution by causing the conveyance unit to convey the document, causing the reading unit to read the image of the document, and executing the lowering step;
When causing the control unit to generate image data of an image with a second resolution that is higher than the first resolution, if the specific setting information is not input, a step of causing the control unit to generate image data of the image at the second resolution by causing the conveyance unit to convey the document at a third low conveyance speed and causing the reading unit to read the image of the document; and,
When causing the control unit to generate image data of an image of the second resolution, if the specific setting information is input, the document is conveyed by the conveyance unit at the third conveyance speed, and the document is An image reading control method comprising: causing the control unit to generate image data of the image at the second resolution by causing the reading unit to read the image.