JP2017098896A - Image reading apparatus, reading method, and image forming apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an image reading apparatus capable of reading a document fed from an automatic document feeding apparatus and a document placed on a document table, the image reading apparatus improving user's convenience when reading a document.SOLUTION: In the image reading apparatus, when it is determined that a document is set on an automatic document feeder and it is determined whether the document is placed on a document table, the document to be determined later is read.SELECTED DRAWING: Figure 11

Description

  The present invention relates to an image reading apparatus capable of optically reading a document, a reading method, and an image forming apparatus.

  2. Description of the Related Art Conventionally, an image reading apparatus that optically reads an image of an original includes an original platen glass on which the original is placed, and a pressure plate for pressing the original against the original platen glass, and an automatic document feeder (ADF: Automatic Document Feeder). Things are known.

  Patent Document 1 describes an image reading apparatus having a document detection sensor for detecting the presence or absence of a document on a document table glass of the image reading device and a document placement table. According to Patent Document 1, when a document is placed on the document table, regardless of the presence of the document on the document table glass, when the user presses the reading start button and issues a reading instruction, The document is conveyed and read with priority.

JP 2003-78692 A

  However, even when a document is placed on the document table glass and the user gives a reading instruction with the document set on the document table, reading of the document on the document table is given priority. Therefore, a user who wants to read on the platen glass side issues a reading instruction again, which takes user man-hours.

  An object of the present invention is to solve such conventional problems. In view of the above, the present invention is an image reading apparatus capable of reading a document fed from an automatic document feeder and a document placed on a document table, and a user who reads a document. An object of the present invention is to provide an image reading apparatus, a reading method, and an image forming apparatus that improve the convenience of the image forming apparatus.

  In order to solve the above problems, an image reading apparatus according to the present invention includes a first determination unit that determines whether or not a document is set on an automatic document feeder, and whether or not a document is placed on a document table. A second determination unit that determines whether the document is set and the first determination unit determines that the document is set, and the second determination unit determines that the document is placed, Reading means for reading a document that is the object of later determination of both determinations.

  According to the present invention, it is possible to improve user convenience when reading a document.

1 is a diagram illustrating an internal configuration of an image forming apparatus. 1 is an external perspective view of an image forming apparatus. It is a figure which shows the structure of an open / close detection sensor. It is a figure which shows the structure of an ADF isolation | separation part periphery. It is a figure which shows the structure around an image sensor unit. It is a figure which shows the internal structure of an image sensor unit. It is a figure which shows the internal structure of an image sensor unit. It is a figure which shows the light quantity distribution of the light guide light source of an image sensor unit. It is a figure which shows the other example of an internal structure of an image sensor unit. It is a block diagram which shows the structure of an image signal processing part. It is a flowchart which shows an image reading process.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. The following embodiments do not limit the present invention according to the claims, and all combinations of features described in the embodiments are not necessarily essential to the solution means of the present invention. . The same constituent elements are denoted by the same reference numerals, and the description thereof is omitted.

  FIG. 1 is a diagram illustrating an internal configuration of an image forming apparatus according to the present embodiment. In this embodiment, the image forming apparatus is, for example, a copying machine, a printer, or a facsimile, and has an image reading function for optically reading an image. Further, the image forming apparatus may be a complex machine in which functions such as a copying machine, a printer, and a facsimile are compounded.

  An image forming apparatus 100 shown in FIG. 1 is roughly divided into an apparatus main body 101, an image reading apparatus 103 provided on the upper part of the apparatus main body 101, and an automatic document feeder (ADF) provided on the upper part of the image reading apparatus 103. An auto document feeder) 126 is included. The automatic document feeder 126 includes an ADF separation unit 115, a sheet discharge conveyance unit 116, a document discharge unit 117, a document pressing plate 118 that presses a book document, and a sheet document conveyance unit 121. The automatic document feeder 126 detects the sheet document D placed on the document table 106 by a document detection sensor 61 (not shown), separates the sheets one by one by the ADF separation unit 115, and supplies the separated image to the image reading device 103. To do. The image reading device 103 reads the sheet document D, which is fed onto the flow reading glass 109 by the automatic document feeder 126, with the image sensor unit 108 in a stopped state. The image reading apparatus 103 can also read a sheet document D or a book document placed on the document table glass 107 by the user.

  When the user places a document on the platen glass 107, the document is detected based on a difference in brightness when the automatic document feeder 126 is opened or closed. The image sensor unit 108 is a so-called line sensor, and optically reads the sheet document D and the book document while moving in the sub-scanning direction when the automatic document feeder 126 is opened and closed. The sub-scanning direction is a left-right direction in FIG. 1, and the main scanning direction is a direction intersecting the sub-scanning direction, that is, a direction indicated by an arrow B in FIG. When the user places a document on the platen glass 107, the image sensor unit 108 reads the end when the automatic document feeder 126 is opened and closed, and the document is detected based on the luminance difference. The document pressing plate 118 is formed by being laminated with a white sheet, sponge or the like in order to prevent the document placed on the document table glass 107 from floating. The document pressing plate 118 is extended until the left end 118a of the document pressing plate 118 is positioned on the left side of the book reading range start position 107a and the right end 118b is positioned on the right side of the book reading range end position 107b.

  The image reading apparatus 103 sends image reading information (read data) to the printing unit 104 of the apparatus main body 101. The apparatus main body 101 prints an image on the sheet P (recording medium) stacked on the cassette paper feeding unit 112 based on the image reading information read by the image reading apparatus 103. The printing unit 104 is, for example, an electrophotographic printing mechanism that uses an LED array. In that case, the apparatus main body 101 includes an LED head unit 110. In addition, the apparatus main body 101 includes a recording sheet discharge unit 113 and a cartridge cover unit 114 that are configured to be capable of stacking a plurality of sheets P on top of the image forming unit 111, the cassette sheet feeding unit 112, and the printing unit 104. including. Further, the apparatus main body 101 includes a joining unit 119 that joins the image reading apparatus 103 and the printing unit 104, a facsimile control unit 120, a double-sided transport unit cover 122, a transport direction switching unit 123, and a resist transport unit 124. Further, the apparatus main body 101 includes an MP (multi-paper) paper feeding unit 125 and a double-sided conveyance unit 150 in the printing unit 104.

  FIG. 2 is an external perspective view of the image forming apparatus 100. As illustrated in FIG. 2, the image forming apparatus 100 includes an operation unit 105. The operation unit 105 includes a display unit such as a display and input keys such as a numeric keypad. The operation unit 105 can receive various instructions from the user, or the user can check the state of the image forming apparatus 100 on the display. The ADF pressure plate 102 shown in FIG. 2 is rotatably attached to the image reading apparatus 103 by a hinge portion 102a, and the user can open and close the automatic document feeder 126 in the direction of a double arrow A in FIG. . One hinge portion 102a is provided on each of the left and right sides of the back side of the apparatus main body 101, and the user can open the ADF pressure plate 102 rearward by lifting the front side of the ADF pressure plate 102. The hinge portion 102a can hold the ADF pressure plate 102 in a state of being opened at a predetermined angle, for example, 70 degrees, by a combination of a damper, a cam, a spring member, and the like. The user places a document such as a sheet document or a book document on the document table glass 107 with the ADF pressure plate 102 opened.

  The hinge unit 102 a includes an open / close detection sensor that can detect the open / close operation of the automatic document feeder 126. The open / close detection sensor includes two angle detection sensors 302 and 303 shown in FIG. 3 and a flag 301, and can detect a plurality of open / close angles with respect to the original platen glass 107 of the automatic original feeder 126. For example, the open / close detection sensor automatically supplies four types of angles of 0 to 5 degrees, 5 to 15 degrees, 15 to 25 degrees, and 25 degrees or more based on the states of the two angle detection sensors 302 and 303 and the flag 301. It can be detected as an open / closed state of the feeding device 126.

  For example, when the angle detection sensor 302 is off (non-detection) and the angle detection sensor 303 is on (detection), the open / close angle of the automatic document feeder 126 is determined to be 0 to 5 degrees. When the angle detection sensor 302 is on and the angle detection sensor 303 is on, it is determined that the opening / closing angle of the automatic document feeder 126 is 5 to 15 degrees. When the angle detection sensor 302 is on and the angle detection sensor 303 is off, it is determined that the opening / closing angle of the automatic document feeder 126 is 15 to 25 degrees. When the angle detection sensor 302 is off and the angle detection sensor 303 is off, it is determined that the opening / closing angle of the automatic document feeder 126 is 25 degrees or more.

  In the present embodiment, the open / closed state of the ADF 102 is detected by a plurality of sensors as described above, but the open / closed state of the automatic document feeder 126 may be detected by a single sensor. Further, the open / close state of the automatic document feeder 126 in a predetermined angle unit is determined. However, the automatic document feeder 126 is detected as a continuous value and compared with a predetermined threshold value. The open / close state may be determined.

  In the following, referring to FIGS. 1, 2, and 4, a flow reading operation when the image forming apparatus 100 performs image reading will be described. As shown in FIGS. 1 and 2, the document placing table 106 is provided on the ADF pressure plate 102. A pair of sliders 106 a are provided on the document placing table 106 so as to be slidable in a direction orthogonal to the sheet document transport direction (that is, the sheet document width direction indicated by the arrow B). By this pair of sliders 106 a, both sides of the sheet document stacked on the document placing table 106 can be aligned. That is, the width alignment of the sheet original can be performed by the pair of sliders 106a. An original length sensor 106b is provided on the original placing table, and the length of the set sheet original can be detected.

  In FIG. 4, the ADF separation unit 115 is provided with a plurality of document width sensors 115d for detecting the presence and width of a sheet document in the width direction of the sheet document. Only one document width sensor 115d is shown in FIG. 4 because it appears to overlap in the depth direction. The image forming apparatus 100 can detect the document size and the document setting direction based on detection signals from the document width sensor 115d and the document length sensor 106b. In FIG. 4, the sheet document transport unit 121 is provided with a document feed sensor 121h and a document edge sensor 121i. The document feed sensor 121h can detect whether or not a sheet document has been fed from the ADF separation unit 115 or the passage of the rear end of the sheet document. The document edge sensor 121i can detect the passage of the leading edge and the trailing edge of the sheet document. The detection signal is used for image reading timing control. The ADF separation unit 115 includes a pickup roller 115a that moves up and down by an actuator (not shown), a separation roller 115b, a retard roller 115c that is pressed against the separation roller 115b and rotates in the reverse direction, and the like.

  The sheet original is first stacked on the original placement table 106 by the user with the reading surface (original surface) facing up. Then, the pickup roller 115a descends, presses the sheet document against the document placing table 106, and feeds it between the separation roller 115b and the retard roller 115c. The retard roller 115c and the separation roller 115b separate and convey the sheet document one by one. Next, the registration roller 121a, the lead roller 121b, and the reading and conveying roller 121c convey the sheet document onto the flow reading glass 109 along the U-turn paper path along the document guide 121d.

  A sheet document pressing plate 121e pressed by an unillustrated urging spring presses and conveys the conveyed sheet document to the reading glass 109. During this time, the sheet document is continuously conveyed. At that time, the image sensor unit 108 has already moved to the sheet document reading position 109a and stopped, and reads the image information of the sheet document passing over the sheet document reading position 109a. Next, the jump table 109b scoops up the sheet document continuously conveyed to the ADF pressure plate 102 side. A reading conveyance roller (not shown) pressed against the reading conveyance roller 121c by a not-illustrated pressing spring and the reading conveyance roller 121c convey the sheet document. Further, the sheet discharge roller 117a and the sheet discharge roller 117b pressed by the sheet discharge roller 117b by the pressing spring discharge the sheet document to the document sheet discharge tray 117c.

  5A and 5B are diagrams showing a configuration around the image sensor unit 108. FIG. 5A is a diagram viewed from the same direction as the diagram shown in FIG. 1, and FIG. 5B is a diagram viewed along the document conveyance direction. The image sensor unit 108 irradiates the image surface of the sheet original with light from a light source including an LED, a resin light guide, and the like, and reflects the reflected light reflected on the image surface with a SELFOC lens (registered trademark), Then, the image is formed on the one-dimensional sensor element array and the image of the sheet original is read. The image sensor unit 108 moves in the left-right direction in FIG. 5 along the guide shaft 103c by a timing belt 103a, a driving pulley 103b rotated by a driving motor (not shown), and a driven pulley 103f. The image sensor unit 108 is supported by the guide shaft 103c by the carriage 103d and is urged upward by the spring 103e. The timing belt 103a and the carriage 103d are connected by a connecting member 103g. A spacer 108 a is interposed between the image sensor unit 108 and the document table glass 107. The image sensor unit 108 optically moves the document while moving the image of the document placed on the document table glass 107 at a constant speed within the range from the book reading range start position 107a to the book reading range end position 107b in FIG. Read on.

  FIG. 6 is a diagram showing an internal configuration of the image sensor unit 108. The image sensor unit 108 irradiates a document with light from a light source including the LED 10 and the resin light guide 11. The reflected light is imaged on the light receiving sensor 13 which is a one-dimensional sensor element array by the Selfoc lens array 12 which is an imaging optical system, so that the image sensor unit 108 optically reads the image information of the document. Can do. The light source may be an axial lamp arranged in the main scanning direction. In the case of color reading, LEDs having different wavelength distributions of three colors of R (red), G (green), and B (blue), which are a plurality of colors, are used as a light source. For monochrome reading, for example, G (green) is used as a monochromatic light source. FIG. 6 shows only one LED for each light guide 11 to be described later for simplification.

  In the image sensor unit 108, a pair of light guide light sources including an LED 10 that is a light emitting element of a light source and a light guide 11 that guides light emitted from the LED 10 to a sheet document serves as an imaging optical system. The SELFOC lens array 12 is disposed on both sides. A light receiving sensor 13 is provided directly below the selfoc lens array 12. The image sensor unit 108 is disposed in the frame body 14. The light receiving sensor 13 has a plurality of light receiving elements 13 a arranged along the main scanning direction of the image sensor unit 108. As shown in FIG. 6, the LEDs 10 are respectively provided at one end of one light guide 11 and the other end of the other light guide 11. In the image sensor unit 108, the above-described constituent members are arranged at point-symmetrical positions with respect to the central axis C.

  Light emitted from each LED 10 travels in the sheet width direction (that is, the main scanning direction of the arrow B) while being repeatedly reflected in each light guide 11, and is emitted from the light emitting surface 11 a of the entire length of the light guide 11. To do. The light emitted from the light guide 11 irradiates the document E on the document table glass 107 as shown in FIG. 7, and is received by the light receiving sensor 13 through the Selfoc lens array 12. The light receiving sensor 13 as a photoelectric conversion element receives the reflected light of the document E and converts the reflected light into an electrical signal.

  FIG. 8 is a diagram showing the light amount distribution of the light guide light source of the image sensor unit 108. In FIG. 8, the light amount distribution based on the distance from the LED 10 on the one light guide 11 side is indicated by a solid line, and the light amount distribution based on the distance from the LED 10 on the other light guide 11 side is a dotted line. It is shown in The light amount distribution of the image sensor unit 108 as a whole is obtained by adding the light amounts of the respective LEDs 10 as indicated by a one-dot chain line. As shown in FIG. 8, the light quantity of the light guide light source is averaged with respect to the distance and becomes constant. As shown in FIG. 6, by providing each LED 10 between the two light guides 11 on the opposite side, a light amount distribution in which the light amounts complement each other is obtained. Good read data can be obtained. Note that the LEDs 10 may be provided at both ends of one light guide 11. Further, as shown in FIG. 9, the LED 10 and the light guide 11 may be provided only on one side with the selfoc lens array 12 interposed therebetween.

  FIG. 10 is a block diagram illustrating a configuration of an image signal processing unit that processes a read image signal. The contact image sensor (CIS) 21 performs photoelectric conversion on the detection signal detected by the light receiving sensor 13 of the image sensor unit 108 to generate an analog signal. The CIS 21 includes an LED 10, a light receiving sensor 13, and an AMP • A / D (amplifier / analog / digital) converter 23. The analog signal generated by the CIS 21 is amplified by the amplifier circuit of the AMP / A / D converter 23 and converted into a digital signal by the A / D converter circuit. The sub CPU 30 stores the digital data converted into the digital signal in the memory 27.

  The image processing circuit 41 rearranges the digital data according to the image information for one line of the sheet document, and executes various image processes. Here, the image processing is, for example, shading correction, filter correction, foreign matter detection processing on the reading unit, and foreign matter correction processing. The digital data that has been subjected to image processing is output to an image forming unit 111 that records an image on a recording medium via an interface (I / F) circuit 42, or the image data can be reproduced to an external host computer or the like. Sent for.

  The sub CPU 30 controls, for example, the lighting time of the LED drive circuit 25 by controlling the reading unit 50. Further, the sub CPU 30 controls the AMP / A / D converter 23 based on the set value transmitted from the main CPU 24. The reading unit common power supply 26 can turn on / off a power supply (not shown) of the reading unit 50. The operation unit 105 displays a status display of the image reading apparatus 103 and an operation state of the entire image forming apparatus 100, and accepts a reading instruction from a user. The LED driving circuit 25 is supplied with electric power from the reading unit common power supply 26 and drives each LED of the CIS 21 under the control of the sub CPU 30. The AMP / A / D converter 23 is also supplied with power from the reading unit common power supply 26 and operates under the control of the sub CPU 30.

  The sub CPU 30 can adjust the reading level (luminance level) of the image by setting a conversion level for converting the analog signal in the AMP / A / D converter 23 into a digital signal. The main CPU 24 transmits setting values and the like stored in the memory 27 to the reading unit 50 via the sub CPU 30 and the communication I / F 51. The set value includes the conversion level of the AMP / A / D converter 23 and each set value for controlling the reading unit 50. The sub CPU 30 adjusts the reading level of the AMP / A / D converter 23 based on the set value received from the main CPU 24 and controls the reading unit 50.

  The main CPU 24 controls power supply to the reading unit 50 by switching the reading unit common power supply 26 to ON / OFF. The main CPU 24 can detect a failure of the LED 10 or an abnormality of the AMP / A / D converter 23 based on digital data representing image information obtained at the time of shading correction or reading level adjustment. When the image reading apparatus 103 is integrated with the image forming apparatus 100, the main CPU 24 controls the entire image forming apparatus 100 according to a program stored in a ROM (not shown) or the like. .

  Hereinafter, an image reading process using the automatic document feeder 126 will be described with reference to FIG. Each process shown in FIG. 11 is realized, for example, when the main CPU 24 reads a program stored in a ROM (not shown) into a RAM (not shown) and executes the program.

  In S <b> 101, the main CPU 24 detects the presence / absence of a document on the document table 106 based on a detection signal from the document detection sensor 61.

  In S <b> 102, the main CPU 24 determines whether or not the automatic document feeder 126 is open with respect to the document table glass 107 based on the detection signals of the angle detection sensors 302 and 303 of the automatic document feeder 126. Determine. If it is determined that the automatic document feeder 126 is open (Yes in S102), the process proceeds to S103. If it is determined that the automatic document feeder 126 is not open (No in S102), the process proceeds to S112.

  In step S <b> 103, the main CPU 24 detects the presence or absence of a document on the platen glass 107 based on a read signal from the image sensor unit 108. However, the presence / absence detection of the document based on the read signal of the image sensor unit 108 is detected in a state where the automatic document feeder 126 is opened. This is based on the difference between the brightness value of the document placed on the platen glass 107 and the brightness value of the external light from the read signal of the image sensor unit 108 with the automatic document feeder 126 opened. This is for detection. Therefore, when the automatic document feeder 126 is closed, the presence / absence of the document on the platen glass 107 cannot be detected.

  In S <b> 104, the main CPU 24 determines whether or not the automatic document feeder 126 is closed with respect to the document table glass 107 based on the detection signals of the angle detection sensors 302 and 302 of the automatic document feeder 126. Determine. If it is determined that the automatic document feeder 126 is in the closed state (Yes in S104), the process proceeds to S105, and if it is determined that the automatic document feeder 126 is not closed (No in S105). , The process returns to S103, and the presence / absence detection of the document on the platen glass 107 is continued.

  In step S <b> 105, the main CPU 24 detects the presence / absence of a document on the document table 106 again. Thereafter, in S <b> 106, the main CPU 24 determines whether there is an instruction to read a document from the user via the operation unit 105. Here, if there is a reading instruction from the user (Yes in S106), the process proceeds to S107, and if there is no reading instruction from the user (No in S106), the process returns to S105 to check whether there is a document on the document table 106. Continue detection.

  In S107, the main CPU 24 determines whether or not the document on the document table 106 has changed from the detection result in S101 and the detection result in S105. If it is determined that there is no change in the document on the document table 106 (No in S107), the process proceeds to S108, and if it is determined that there is a change in the document on the document table 106 (Yes in S107). Advances to S111.

  In S <b> 108, the main CPU 24 determines whether or not there is a document on the platen glass 107 from the detection result in S <b> 103. If there is a document on the platen glass 107 (Yes in S108), the process proceeds to S109, and the image sensor unit 108 reads the document on the platen glass 107. If there is no document on the platen glass 107 (No in S108), the process proceeds to S110 and notifies the user that there is no document to be read via the operation unit 105.

  On the other hand, in S111, it is determined whether or not the document on the document table 106 has been changed from none to presence. Here, when the document on the document placement table 106 has not changed from “no” to “present” (No in S111), the main CPU 24 determines that the document on the document placement table 106 is not placed. , Go to S108. If the document on the document table 106 has changed from “no” to “present”, the document placed on the document table 106 is conveyed and read in S114.

  If the automatic document feeder 126 is not open (No in S102), the main CPU 24 determines whether or not there is a document reading instruction from the user via the operation unit 105 in S112. If there is no document reading instruction from the user (No in S112), the process returns to S101, and the presence / absence detection of the document on the document table 106 is continued. On the other hand, if there is a document reading instruction from the user (Yes in S112), the process proceeds to S113, where it is determined whether or not it is determined that there is a document on the document placement table 106 in S101 of the document detection sensor 61. If it is determined that there is a document on the document placement table 106 in S101 (Yes in S113), the main CPU 24 proceeds to S114 and executes conveyance and reading of the document on the document placement table 106. If it is not determined that there is a document on the document table 106 in S101 (No in S113), the process proceeds to S110, and the user is notified that there is no document to be read via the operation unit 105.

  In the present embodiment, the automatic document feeder 126 is opened to place a document on the document table glass 107, and the automatic document feeder 126 is closed to place a document on the document table 106. There must be.

  In S107, when it is determined that the detection result that there is a document on the document placing table 106 before and after the automatic document feeder 126 is opened and closed is not changed, in this embodiment, the document is placed on the document table glass 107. The placed document is to be read. This is because even when the presence of a document is detected on the document table 106 after the automatic document feeder 126 has been opened and closed to place the document on the document table glass 107, the automatic document feeder If the presence of the document is detected in the detection result before opening 126 (S101), the document detected on the document table 106 is placed before the document is placed on the document table glass 107. It is because it can be judged that it was. Therefore, even if there are documents on both the document table 106 and the document table glass 107, the document placed later can be preferentially read.

  Even when the detection result of the document on the document placing table 106 does not change from “no” to “present” before and after the automatic document feeder 126 is opened and closed (No in S109), the document is placed on the document table glass 107. A document is to be read. This is a case in which it is determined in S107 that there is a change in the document detection result on the document table 106 before and after the automatic document feeder 126 is opened and closed. This is the case. In this case, since there is no readable document on the document table 106, the document table glass 107 can be determined as a reading target. Therefore, even if it is detected that a document is present on the document placing table 106 before the automatic document feeding device 126 is opened, the document is placed on the document placing table 106 after the automatic document feeding device 126 is closed. When it is detected that there is no document, the document table glass platen 107 can be read.

  On the other hand, when the detection result of the document on the document placing table 196 changes from “no” to “present” before and after the automatic document feeder 126 is opened and closed (Yes in S109), the document on the document placing table 106 is set as a reading target. To do. Even when the automatic document feeder 126 is opened and a document is placed on the document table glass 107, the document is placed on the document table 106 after the automatic document feeder 126 is closed. This is because it can be determined that is placed. Therefore, even if there is a document on both the document table 106 and the document table glass 107, the document placed later can be preferentially read.

  Further, when the automatic document feeder 126 is not opened or closed (No in S102), there is a reading instruction from the user (Yes in S110), and a document is placed on the document placing table 106. (Yes in S111) sets the document on the document table 106 as a reading target. This is because the automatic document feeder 126 is not opened and closed, so that the presence or absence of the document on the platen glass 107 cannot be detected. However, since the automatic document feeder 126 is not opened and closed, the document is placed on the platen glass 107. It is because it can be judged that it is not placed. If there is a change in the document on the document table 106 (Yes in S107) and the document on the document table 106 has changed from being present to not present (No in S111), the document is read onto the document table 106. Since there is no target document, the presence or absence of the document on the document table glass 107 is detected in S108. If there is a document on the platen glass 107 (Yes in S108), the document on the platen glass 107 is read in S109, and if there is no document on the platen glass 107 (No in S108), an object to be read in S110. The user is notified that there is no original.

  As described above, in the present embodiment, for example, when a document exists on both the document table glass 107 and the document placement table 106, the document placed later is determined as a document to be read. As a result, it is possible to read a document that the user desires to read, and to prevent re-reading of a reading instruction or the like.

  24 Main CPU: 100 Image forming apparatus: 126 Automatic document feeder: 106 Document placement table: 107 Document table glass

Claims (8)

First determination means for determining whether or not a document is set on the automatic document feeder;
Second determination means for determining whether or not a document is placed on the document table;
When it is determined that the original is set by the first determination unit and the original is placed by the second determination unit, the determination is a later determination target. Reading means for reading a document;
An image reading apparatus comprising: The automatic document feeder is openable and closable with respect to the document table,
Detecting means for detecting an open / closed state of the automatic document feeder,
The second determination unit determines whether or not a document is placed on the document table when the detection unit detects an open state of the automatic document feeder.
The image reading apparatus according to claim 1. The first determination unit is provided in the automatic document feeder when the detection unit detects the open state of the automatic document feeder and when the automatic document feeder is closed. Determine whether a document is loaded,
The image reading apparatus according to claim 2. Receiving means for receiving a document reading instruction;
When the reading unit receives the reading instruction by the receiving unit, the reading unit starts reading the document placed on the document table or the document set on the automatic document feeder.
The image reading apparatus according to claim 1, wherein the image reading apparatus is an image reading apparatus. A detection sensor for detecting a document placed on a document placement table of the automatic document feeder;
The first determination unit determines whether or not a document is set on the automatic document feeder based on a detection signal of the detection sensor.
The image reading apparatus according to claim 1, wherein the image reading apparatus is an image reading apparatus. The reading means includes an image sensor unit,
The second determination means determines whether or not a document is placed on the document table based on a detection signal of the document placed on the document table by the image sensor unit.
The image reading apparatus according to claim 1, wherein the image reading apparatus is an image reading apparatus. The image reading apparatus according to any one of claims 1 to 6,
An image forming means for forming an image based on the read data read and generated by the reading means;
An image forming apparatus comprising: A reading method executed in an image reading apparatus capable of reading a document fed from an automatic document feeder and a document placed on a document table,
A first determination step for determining whether or not a document is set on the automatic document feeder;
A second determination step of determining whether or not a document is placed on the document table;
If it is determined in the first determination step that a document is set, and it is determined in the second determination step that a document is placed, the determination is a later determination target. A reading process for reading a document;
A reading method comprising:

Images