JP2021072512A - Image reading device - Google Patents

Abstract

To determine a cause of an error when abnormality occurs in alignment of an image reading device.SOLUTION: An image reading device 1000 includes a document platen 200, a scanner unit 202 for reading an image of a document placed on the document platen, an optical motor for moving reading means, an HP sensor 213 for outputting according to a position of the scanner unit 202, and a first controller. When abnormality occurs in alignment using output from the HP sensor 213, a CPU of a first controller drives the optical motor and controls the scanner unit 202 so as to move the scanner unit 202 while executing image reading by the scanner unit 202, and specifies a cause of abnormality by using the read-out image data.SELECTED DRAWING: Figure 1

Description

The present invention relates to an image reader that reads an image of a document.

As an image reading device, there is known one that scans an image of a document placed on a platen glass by scanning the document while the optical scanner unit moves at a constant speed in the sub-scanning direction. The image reading device in Patent Document 1 is provided with an HP sensor (home position sensor) for detecting that the optical scanner unit is located at a predetermined position. The position of the optical scanner unit can be adjusted based on the detection result of the HP sensor.

Japanese Unexamined Patent Publication No. 2016-178624

If the state in which the HP sensor does not detect the optical scanner unit continues for a predetermined time, the serviceman is notified that an abnormality has occurred in the image reading device. However, it takes time for the serviceman to identify the cause of the abnormality. Specifically, for example, it takes time to identify whether the drive motor for moving the optical scanner unit has failed or the HP sensor has failed. During that time, the user cannot use the image reading device, which may cause inconvenience to the user.

The present invention has been made in view of the above problems, and an object of the present invention is to identify the cause of an abnormality in an image reading device.

In order to solve the above problems, the image reading device of the present invention includes a platen, a reading means for reading an image of a document placed on the platen, a moving means for moving the reading means, and the reading means. A position detecting means that outputs according to a position and a control means that drives the moving means so as to move the reading means and aligns the reading means using the output from the position detecting means. The control means has the moving means so as to move the reading means while executing image reading by the reading means when an abnormality occurs in the alignment using the output from the position detecting means. It is characterized in that the driving of the above and the control of the reading means are performed, and the cause of the abnormality is determined by using the image data read by the reading means.

According to the present invention, the cause of the abnormality in the image reading device can be identified.

Sectional view of the image reader. Perspective view of the image reader. Configuration diagram of the control unit. Explanatory drawing of the moving position of a scanner unit. Explanatory drawing of a scanner unit and its drive configuration. Flowchart of scanner unit positioning control. Flowchart of HP error diagnosis processing. Explanatory drawing of the scanned image around a shading white plate. A graph showing the brightness of a scanned image around a shading white plate. Explanatory drawing of the display of the operation display part after the failure part determination. A flowchart showing control at the time of misalignment.

Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings.

<Configuration example of image reader 1000>
The image reading device 1000 will be described with reference to FIGS. 1 and 2. FIG. 1 is a cross-sectional view showing an example of an image reading device including the automatic document transporting device (ADF: Auto Document Feeder) of the present embodiment. FIG. 2 is a perspective view of the image reading device 1000. In FIG. 1, the platen cover 100 is described as a configuration included in the ADF, but in reality, the ADF includes a loading portion on which the original is loaded, a conveying roller for conveying the original, and a conveying original. It has a known configuration such as a reading unit that reads the image on the second surface.
The image reading device 1000 of the present embodiment includes an image reading unit 200 that reads an image of a document and a document base cover 100 (ADF) that is rotatably (opened and closed) attached to the image reading unit 200. The image scanning unit 200 includes an optical scanner unit 202 as a scanning unit that optically reads an image of a document. Further, the image reading unit 200 includes a scanning glass 201, a platen glass 209, a shading white plate 210, a sub-scanning size sensor 212, an open / close sensor 211 that detects opening / closing of the platen cover 100, and an HP (home position) sensor 213. ..

The scanner unit 202 reads the image of the original document with the depth direction of FIG. 1, that is, the direction perpendicular to the paper surface as the main scanning direction. The image reading unit 200 includes a fixed reading mode for reading an image of a document placed on a platen glass 209, and a scanning mode for reading an image of a document conveyed by an ADF.

When fixed reading is performed, the scanner unit 202 irradiates the document placed on the platen glass 209 with the light emitted from the LEDs 203a and 203b while moving in a predetermined direction at a constant speed. The reflected light from the document is guided to the image reading sensor 208 by the mirrors 204a to 204c. The image reading sensor 208 receives the reflected light and converts it into an electric signal. In the example of FIG. 1, the predetermined direction is the sub-scanning direction (direction of the arrow in FIG. 1) orthogonal to the main scanning direction.
When scanning is performed, the scanner unit 202 reads the image of the document conveyed by the ADF through the scanning glass 201.

The sub-scanning size sensor 212 is provided at a predetermined position in the sub-scanning direction, and detects the presence or absence of a document placed on the platen glass 209. The HP sensor 213 detects the position of the scanner unit 202 that moves by the rotation of the optical motor 820. The control for grasping the position of the scanner unit 202 will be described later. The positional relationship between the platen cover 100, the scanning glass 201, the scanner unit 202, the platen glass 209, the open / close sensor 211, and the sub-scanning size sensor 212 is shown in the perspective view of FIG.

<Control unit>
FIG. 3 is a configuration diagram of a control unit that controls the operation of the image reading device 1000. The control unit of the present embodiment is composed of the first controller 310 and the second controller 300, but these may be integrally configured. The first controller 310 mainly controls the scanner unit 202, and the second controller 300 mainly performs an image data generation process representing an image read by the scanner unit 202.

The first controller 310 is a computer system including a CPU (Central Processing Unit) 801 and a ROM (Read Only Memory) 802, and a RAM (Random Access Memory) 803. The ROM 802 stores the control program of the CPU 801 and the RAM 803 stores the input data and the work data used by the CPU 801. The CPU 801 reads the control program stored in the ROM 802 and executes the RAM 803 in the work area to control the operation of each part of the image reading device 1000.

A sub-scanning size sensor 212 and an open / close sensor 211 are connected to the CPU 801. The open / close sensor 211 is a flag-shaped sensor that operates in response to rotation (opening / closing) of the platen cover 100. The open / close sensor 211 detects whether or not the platen cover 100 is opened by a predetermined angle (for example, 1 °) or more with respect to the image reading unit 200 (document base glass 209). As shown in FIG. 2, a part of the open / close sensor 211 protrudes from the upper surface of the image reading unit 200 when the platen cover 100 is open with respect to the image reading unit 200. The open / close sensor 211 detects that the platen cover 100 is open.

When the platen cover 100 is closed, the protruding portion is pushed into the image reading unit 200 by the platen cover 100, and in this state, the open / close sensor 211 detects that the platen cover 100 is closed. Further, the sub-scanning size sensor 212 irradiates the platen glass 209 with light rays from the inside of the image reading unit 200. When the platen cover 100 is closed, the reflected light from the platen cover 100 is detected by the sub-scanning size sensor 212. When the document is above the sub-scan size sensor 212, the reflected light from the document is detected by the sub-scan size sensor 212.

In the present embodiment, when the reflected light is detected in this way, the sub-scanning size sensor 212 outputs ON. On the other hand, when the platen cover 100 is open and there is no document above the sub-scanning size sensor 212, the reflected light is not detected by the sub-scanning size sensor 212. In this case, in the present embodiment, the sub-scanning size sensor 212 outputs OFF. The CPU 801 can determine the size of the document in the sub-scanning direction by using the open / close sensor 211 and the sub-scanning size sensor 212.

An optical motor 820 and an LED 203 for irradiating a document are connected to the CPU 801. Further, the CPU 801 is connected to a fuse input port 220 which becomes Low when the fuse is blown in order to confirm whether or not the board that outputs various control signals is broken when an abnormality occurs in the image reading sensor 208. To.

The optical motor 820 is controlled by the CPU 801 to move the scanner unit 202 in the sub-scanning direction. The scanner unit 202 is moved in the sub-scanning direction by the optical motor 820 along, for example, a rail extending in the sub-scanning direction, which is the moving direction, or the guide shaft 250 shown in FIG. When reading the image of the original, the CPU 801 rotates the optical motor 820 to move the scanner unit 202 to a position directly below the shading white plate 210, and performs known image quality adjustment (shading correction).

After that, the scanner unit 202 moves at a constant speed in the sub-scanning direction shown by the arrow in FIG. 1 and reads the image of the document placed on the platen glass 209 by the method described above. The image reading sensor 208 inputs an electric signal based on the received reflected light to the CPU 801. The CPU 801 transmits the received electric signal from the image processing unit 833 to the second controller 300 via the image line 353.

The second controller 300 is a computer system including a CPU 901, a ROM 902, and a RAM 903. The CPU 901 reads the control program stored in the ROM 902 and executes the RAM 903 in the work area to generate image data. Data related to image reading control is exchanged via the communication line 354 with the CPU 801.

The CPU 901 generates image data representing the image of the read original by the signal received from the CPU 801 via the communication line 354 and the electric signal received by the image processing unit 905 via the image line 353. The data received from the image reading unit 200 is stored in the image memory 906. Further, the second controller 300 includes an operation display unit 904. The operation display unit 904 is a user interface, and the user gives an instruction to start reading the original. The CPU 901 displays a screen on the operation display unit 904 to support the input of instructions by the user. The CPU 801 and the CPU 901 may be physically the same CPU, and communication between the CPUs may be performed by inter-task communication.

<Drive configuration of scanner unit>
The drive configuration of the scanner unit will be described with reference to FIGS. 4 and 5. FIG. 4 is a diagram illustrating the relationship between the position of the scanner unit 202 and the output of the HP sensor 213. FIG. 5 is an explanatory diagram of the scanner unit 202 and its moving configuration. At the HP sensor edge position shown in FIG. 4, the output value of the HP sensor 213 is OFF due to the scanner unit 202 moving from the position of the right end portion to the position of the left end portion in the movable range of the scanner unit 202. It is the position to turn on from.

D1 is the distance between the HP sensor edge position and the position of the right end portion in the movable range of the scanner unit 202. Further, D2 is the distance between the leftmost position in the movable range of the scanner unit 202 and the HP sensor edge position. Further, L1 represents a range around the shading white plate 210. In the present embodiment, in FIG. 4, when the scanner unit 202 is located on the left side of the HP sensor edge position, the HP sensor 213 is turned on. Further, in FIG. 4, when the scanner unit 202 is located on the right side of the HP sensor edge position, the HP sensor 213 is turned off.

In FIG. 5, in addition to the scanner unit 202 and the HP sensor 213, the guide shaft 250 and the scanner belt 251 are shown. The scanner unit 202 is connected to the optical motor 820 via the scanner belt 251. When the optical motor 820 is rotated, the scanner belt 251 operates, and the scanner unit connected to the scanner belt 251 moves on the guide shaft 250. As a result, the scanner unit 202 moves in the sub-scanning direction.

After the power is turned on, it is unknown where the scanner unit 202 is located in the sub-scanning direction. Therefore, the CPU 801 moves the scanner unit 202 to the home position (performs alignment control) based on the output of the HP sensor 213. In addition, alignment may be called positioning, positioning, or the like. The details of the alignment control will be described in detail.

<Alignment control of scanner unit>
Hereinafter, the alignment control of the scanner unit 202 will be described. FIG. 6 is a flowchart of the scanner unit positioning control. When the user turns on the power of the image reader 1000 to use the image reader 1000, the CPU 801 aligns the scanner unit 202 driven by the optical motor 820 after performing the necessary initial settings. .. This is because, as described above, it is unknown at which position the scanner unit 202 is on the sub-scanning at the time after the power is turned on.

At the time of alignment, the CPU 801 first confirms the output of the HP sensor 213 (S101). When the output of the HP sensor 213 is OFF (S101: N), the CPU 801 determines that the scanner unit 202 is on the right side of the HP sensor edge position from the positional relationship shown in FIG. 4, and moves the scanner unit 202 to the left. (S106). The CPU 801 monitors whether or not the output of the HP sensor changes to ON while the scanner unit 202 is moving (S107). When it is determined in S107 that the output of the HP sensor 213 is OFF (S107: N), the CPU 801 confirms whether or not the scanner unit 202 has moved more than the ON error distance, which is a preset predetermined distance. (S111).

When the scanner unit 202 has not moved the ON error distance (S111: N), the CPU 801 returns to S107 and checks the HP sensor again. If the output of the HP sensor is not turned ON and the movement is longer than the ON error distance (S111: Y), the CPU 801 determines that an abnormality has occurred (S112) and ends the alignment control. Here, the ON error distance is the distance from the HP sensor edge position to the right end position, which is shown by D1 in FIG. D1 is a distance that reliably reaches the HP sensor edge position when the output of the HP sensor 213 is OFF, that is, when the scanner unit 202 is on the right side of the HP sensor 213. If the image reader 1000 is normal, moving the scanner unit 202 to the left at least D1 in FIG. 4 ensures that the scanner unit 202 reaches the HP sensor edge position.

Therefore, if the output of the HP sensor does not turn ON even though the optical motor 820 is driven to move the scanner unit 202 by D1 or more, the CPU 801 has an abnormality in at least one of the optical motor 820 and the HP sensor 213. Judge that it is. Next, a case where the output of the HP sensor is turned ON before the moving distance of the scanner unit 202 reaches D1, which is an ON error distance, will be described (S107: Y). In this case, the CPU 801 moves the scanner unit 202 to the left by a predetermined distance from the timing at which the sensor is switched and stops it (S108).

When the output of the HP sensor is ON in S101 (S101: Y), or when the scanner unit 202 is moved by a predetermined distance in S108, as can be seen from the positional relationship in FIG. 4, the scanner unit 202 is located from the HP sensor edge position. Located on the left side. Therefore, the CPU 801 controls the optical motor 820 to move the scanner unit 202 to the right in the drawing (S102).

Here, as in S106, abnormality detection is performed by moving the scanner unit 202 by a predetermined distance. That is, the CPU 801 determines whether or not the output of the HP sensor 213 is OFF (S103), and if the output is ON (S103: N), drives the optical motor 820 and causes the scanner unit 202 to make an OFF error. It is determined whether or not the vehicle has moved more than a distance (S109). When the scanner unit 202 has been moved to the right by the OFF error distance or more while the HP sensor is ON (S109: Y), the CPU 801 has an abnormality in at least one of the optical motor 820 and the HP sensor 213. (S110). As a result, the alignment process is completed.

Here, the OFF error distance is the distance from the HP sensor edge position to the left end position, which is shown by D2 in FIG. That is, D2 is a distance that ensures that the HP sensor edge position is reached when the output of the HP sensor 213 is ON (the scanner unit 202 is on the left side of the HP sensor 213). If the image reader 1000 is normal, moving the scanner unit 202 to the right in the drawing ensures that the scanner unit 202 reaches the HP sensor edge position.

When the image reader 1000 is normal and the HP sensor is turned off before the scanner unit 202 moves by the OFF error distance or more (S103: Y), the CPU 801 moves the scanner unit 202 a predetermined distance from the timing when the sensor is switched. Move. As a result, the scanner unit 202 stops at the shading position, which is the position directly below the shading white plate 210 in FIG. 4 (S104).

After that, the CPU 801 updates the current position of the scanner unit 202 held in the RAM 803 as the home position position (S105). When the CPU 801 grasps the current position of the scanner unit 202 as described above, the alignment control is completed.

<Identify the faulty part when the alignment is abnormal>
The control of the image reader 1000 when the alignment is abnormal will be described with reference to FIGS. 7 to 10. FIG. 7 is a flowchart of HP error diagnosis processing which is a failure location identification control, FIG. 8 is an explanatory diagram of a scanned image around a shading white plate, FIG. 9 is a graph showing the brightness of a scanned image around a shading white plate, and FIG. 10 is a fault location determination. It is explanatory drawing of the display of the operation display part later.

In the HP error diagnosis process, the CPU 801 confirms the failure of the electric board that outputs the operation signal of the HP sensor 213 and the optical motor 820 in order to determine the failed portion when an abnormality occurs in the alignment control (S201). ). In the flowchart of FIG. 5, since an abnormality occurs in the alignment control in S110 and S112, S201 is executed.

In this example, as an example of checking the failure of the electric board, it is assumed that the failure of the board is confirmed by checking the state of the fuse connected to the circuit on the electric board. In the present embodiment, the CPU 801 is connected to a fuse input port 220 configured to be Low when the fuse of the electric board is blown and High when the fuse is not blown. The CPU 801 confirms the failure of the board by referring to the output. In S201, the CPU 801 determines whether or not the output of the fuse input port 220 is Low, and if it is Low (S201: N), determines that the electric board is out of order (S210).

When the output of the fuse input port 220 is High and it is determined that there is no failure in the board (S201: Y), the CPU 801 turns on the image reading sensor 208 in the scanner unit 202 in preparation for reading the image (S202). ). After that, the CPU 801 turns on the LED 203 (S203). When the output of the HP sensor 213 is ON (S204: Y), the CPU 801 drives the optical motor 820 so that the scanner unit 202 moves to the right in FIG. 4 (S205). On the other hand, when the output of the HP sensor 213 is OFF (S204: N), the CPU 801 drives the optical motor 820 so that the scanner unit 202 moves to the left in FIG. 4 (S206).

Then, the CPU 801 determines whether or not there is an image change in the image acquired by the scanner unit 202 (S207).

The image of the range L1 of L1 (around the shading white plate) of FIG. 4 is an image as shown in FIG. 8 in the normal state. In FIG. 8, one apex of the scanning glass 201 is set as the origin, the horizontal axis represents the distance from the origin in the sub-scanning direction, and the vertical axis represents the distance from the origin in the main scanning direction. Further, the center position of the document in the main scanning direction is indicated as "M" in the drawing.

In FIG. 8, a region having a high brightness value that can be read as a color close to white appears, such as a shading white plate 210, a scanning glass 201, and a platen glass 209. Further, in FIG. 8, a region having a low luminance value that can be read as a color close to black, such as a region formed by other members such as a holding member, also appears. In the present embodiment, the image reading sensor 208 describes the process of determining the cause of the abnormality by using the value of the brightness of the read image, but the chromaticity and other physical property values are detected instead of the brightness. You can also determine the cause of the abnormality with.

With respect to the brightness value of the acquired image, the CPU 801 determines whether or not the brightness value is equal to or higher than a certain value. In FIG. 9, the horizontal axis represents the sub-scanning position and the vertical axis represents the brightness of the image data. As shown in the figure, in the present embodiment, the threshold value Th is set, and the brightness value of the main scanning center position M is equal to or higher than the threshold value Th in the horizontal axis direction in the figure, that is, the sub-scanning direction for the image for which the brightness value is acquired. When the value changes below the threshold value Th, it is determined that there is an image change. The fact that there is an image change means that the scanner unit 202 is moving. Therefore, the CPU 801 determines that the optical motor 820, the scanner belt 251 that transmits the drive thereof, and the like are operating normally. On the other hand, when it is determined that the brightness value does not change beyond the threshold Th and there is no image change as described above, the position of the scanner unit 202 has not moved and the optical motor 820 or the like. It is determined that the scanner belt 251 or the like that transmits the drive is not operating normally.

Returning to FIG. 7, when there is an image change in S207 (S207: Y), the CPU 801 determines that the scanner unit 202 is moving normally. Then, the CPU 801 determines that the failure of the HP sensor 213 is not a failure of the driving member such as the optical motor 820 or the scanner belt 251 that transmits the driving thereof (S209). As described above, if the optical motor 820 moves and the scanner unit 202 moves normally, an image as shown in FIG. 8 can be obtained, and the brightness of the center position M in the main scanning direction changes as shown in FIG. This is to get out.

When there is no image change in S207 (S207: N), the CPU 801 is in a state where the brightness value of the main scanning center position M of the acquired image does not change from the threshold value Th or more to less than the threshold value Th in the sub-scanning direction for a predetermined time. Determine if it has been done. If the predetermined time has not elapsed (S208: N), the CPU 801 executes S207 again. When the predetermined time has elapsed (S208: Y), the CPU 801 determines that there is no image change due to the fact that the scanner unit 202 has not moved. As a result, the CPU 801 determines that the optical motor 820 and the drive member that transmits the drive thereof have failed (S210). After determining the faulty part, the CPU 801 displays the wording indicating the faulty part on the operation display unit 904 (S212) as shown in FIG. 10, and ends the diagnosis. In this example, the operation display unit 904 in the figure displays "Stopped because an abnormality was detected", "Please contact the service in charge with the following code. E001", and "Failure location: HP sensor".

By the above processing, when the user makes a telephone call to the call center, the user can tell where the faulty part is by telling the faulty part from the display of the operation display unit 904. That is, the cause of the abnormality in the image reading device can be identified. Therefore, in the call center, it is possible to deal with the failure after identifying the failure location, and it is possible to achieve speedy response. Further, even when the serviceman reaches the image reading device 1000 in which the failure occurred during the repair, the failed part can be seen at a glance from the display of the operation display unit 904, so that the labor and time required for the repair can be shortened.

Second Embodiment Hereinafter, the second embodiment will be described. The image reading device 1000 configuration, the functional block diagram, the driving configuration of the scanner unit, the alignment control, and the like in the second embodiment are the same as those in the first embodiment.

<Identify the faulty part when the alignment is abnormal>
The control at the time of the misalignment of the image reading device 1000 in the second embodiment will be described. FIG. 11 is a flowchart showing control when the alignment is abnormal. When an abnormality occurs in the alignment control, the CPU 801 confirms whether the electrical board on which the CPU 801 itself is arranged and outputs the operation signal of the HP sensor 213 or the optical motor 820 is out of order in order to determine the location of the failure. (S301). The failure location determination in the case of a board failure (S301: Y) is the same as in the first embodiment.

On the other hand, when there is no board failure (S301: N), the CPU 801 determines whether or not the platen cover 100 is open with reference to the open / close sensor 211 (S302). When the platen cover 100 is open (S302: N), the CPU 801 starts driving the optical motor 820 (S303). Next, the CPU 801 starts monitoring whether or not there is a change in the output value of the sub-scanning size sensor 212 (S304). When the scanner unit 202 is located above the sub-scanning size sensor 212, the sub-scanning size sensor 212 detects the reflected light from the scanner unit 202 and outputs ON. On the other hand, if there is no scanner unit 202 above it, the reflected light from the scanner unit 202 is not detected, so OFF is output. From this, when the output value of the sub-scanning size sensor 212 does not change (S304: N), the CPU 801 determines whether the optical motor 820 has been driven by the time the scanner unit 202 moves a predetermined distance (S307). .. If the optical motor 820 is not driven by the time the optical motor 820 is moved by a predetermined distance (S307: N), S304 is executed again.

If the output of the sub-scanning size sensor 212 is changed from OFF to ON (S304: Y) before the scanner unit 202 completes the movement by a predetermined distance, the CPU 801 determines that the scanner unit 202 is moving normally. After that, the CPU 801 determines that there is no abnormality in the optical motor 820 and the drive members such as gears and pulleys. As a result, the CPU 801 executes the stop processing of the optical motor 820 (S305), and determines that the HP sensor has failed (S306).

Next, a case where the output value of the sub-scanning size sensor 212 does not change (S304: N) and the optical motor 820 is driven before the scanner unit 202 moves a predetermined distance in S307 (S307: Y) will be described. To do. In this case, the CPU 801 determines that the scanner unit 202 has not moved. As a result, the CPU 801 executes the stop processing of the optical motor 820 (S308), and determines that the drive members such as the optical motor 820 and the scanner belt 251 have a failure (S309).

When the platen cover 100 is closed in S302 (S302: Y), the subsequent processes (S310 to S319) until the failure location is determined are the same as the processes of S202 to S211 in FIG. 7. Is omitted. After determining the faulty part, the CPU 801 displays the wording indicating the faulty part on the operation display unit 904 (S320) as shown in FIG. 10, and ends the diagnosis.

By the above processing, even when the platen cover 100 is open, it is possible to determine the faulty part without making the user feel glare. Moreover, when the user makes a telephone call to the call center or when the serviceman makes a repair, the operation display unit 904 can tell where the defective part is, so it is troublesome to identify the faulty part. And time can be shortened.

As described above, in the image reading unit 200 of the present embodiment, when an alignment abnormality occurs, information indicating the cause of the abnormality is acquired and displayed on the operation display unit 904, thereby shortening the time required for the service person to respond to the abnormality. It is possible to reduce the time when the user cannot use the device.

In the first embodiment and the second embodiment, the alignment process for aligning the scanner unit 202 with the initial position has been described. However, the present invention is not limited to the initial position, and can be applied to a process for adjusting the scanner unit 202 to an arbitrary position by moving the scanner unit 202 while reading an image. Further, although the brightness value of the image data is used to determine the cause of the abnormality, it is possible to use an arbitrary value of the image data, for example, an arbitrary value or parameter such as chromaticity. ..

Claims (10)

The platen and
A reading means for reading an image of a document placed on the platen, and
A moving means for moving the reading means and
A position detecting means that outputs according to the position of the reading means, and a position detecting means.
An image reading device comprising a control means for driving the moving means so as to move the reading means and aligning the reading means using an output from the position detecting means.
The control means
When an abnormality occurs in the alignment using the output from the position detecting means, the moving means is driven and the reading means is controlled so as to move the reading means while executing the image reading by the reading means. And
The cause of the abnormality is determined by using the image data read by the reading means.
Image reader. In determining the cause of the abnormality, the control means causes a failure of the moving means when the value of the read image data in the moving direction of the reading means is smaller than a predetermined threshold value. It is characterized in that it is determined that
The image reading device according to claim 1. In determining the cause of the abnormality, the control means causes a failure of the moving means when the value of the read image data in the moving direction of the reading means is equal to or higher than a predetermined threshold value. It is characterized by determining that it is not.
The image reading device according to claim 1. In determining the cause of the abnormality, the control means causes the abnormality when the value of the read image data in the moving direction of the reading means is equal to or higher than a predetermined threshold value, the cause of the abnormality is the position detecting means. It is characterized by determining that it is a failure of
The image reading device according to claim 3. The value of the image data is a luminance value of the image data.
The image reading device according to any one of claims 2 to 4. The value of the image data is the chromaticity of the image data.
The image reading device according to any one of claims 2 to 4. Has more display means,
The control means is characterized in that the cause of the determined abnormality is displayed on the display means.
The image reading device according to any one of claims 1 to 6. It further has a document table cover that covers the document table and an open / close detecting means for detecting the opening / closing of the document table cover.
When an abnormality occurs in the alignment using the output from the position detecting means, or when the open / close detecting means detects that the platen cover is closed, the control means of the moving means. It is characterized by performing driving and control of the reading means.
The image reading device according to any one of claims 1 to 7. When an abnormality occurs in the alignment using the output from the position detecting means, or when the open / close detecting means detects that the platen cover is open, the control means moves the moving means. The driving of the reading means and the control of the reading means are not executed.
The image reading device according to claim 8. Further, it has a reflected light detecting means for irradiating the platen cover with a light beam and detecting the reflected light.
The reading means can be moved to a position between the reflected light detecting means and the platen cover.
When an abnormality occurs in the alignment using the output from the position detecting means, or when the open / close detecting means detects that the platen cover is open, the control means reads the reading means. Drives the moving means so as to reach a position between the reflected light detecting means and the platen cover, and when the reflected light is not detected by the reflected light detecting means, the cause of the abnormality is the moving means. It is characterized by determining that it is a failure of
The image reading device according to claim 9.

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