JP2008040200A - Image reading apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To more correctly detect a document size by suitably eliminating the effects of external light and the pressing face of a document holding cover. <P>SOLUTION: The reading width W1 of a placed document readable area 36A is narrower than the reading width W2 of a conveyed document readable area 35A. The document set reference position 37 of the placed document readable area 36A is set on the turning shaft 34A side. The part 36Ae of the placed document readable area 36A and the part 35Ae of the conveyed document readable area 35A, both of which are on the turning shaft 34A side, are disposed at almost the same distance from the turning shaft 34A in a direction almost perpendicular to the direction of the shaft. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an image reading apparatus capable of reading an image by both a flat bed method and a sheet feed method.

  As an image reading apparatus, there is one in which a contact glass is disposed on a side of a platen glass. The platen glass is a transparent plate-like member for placing a document when reading an image by a flat bed method. The contact glass is a transparent long member disposed so as to come into contact with a conveyed document when an image is read by a sheet feed method.

  In the image reading apparatus as described above, the document size is detected in advance when an image is read by the flat bed method. In a general image reading apparatus, after placing an original on the platen cover, the original size is detected based on the reflected light by irradiating the original on the platen glass while closing the original cover. It is carried out.

  Examples of prior art related to the present invention include those described in Patent Documents 1 to 3.

JP-A-9-307695 JP 2003-219120 A JP 2006-65289 A

  Incidentally, the pressing surface of the document pressing cover as described above is generally white and generally has the same color as the document. For this reason, if the boundary between the document placed on the platen glass and its surroundings is close to the rotation axis of the document pressing cover, the document and its surroundings are in the early stage of closing the document pressing cover. And the detection of the document size may be inaccurate.

  On the other hand, if the boundary between the document placed on the platen glass and its surroundings is located far from the rotation axis of the document pressing cover, the size of the document will be affected by external light. This is likely to cause inaccurate document size detection.

  Therefore, an object of the present invention is to appropriately eliminate the influence of the pressing surface of the document pressing cover portion and external light, and to detect the document size more accurately.

  In order to solve the above-described problem, the present invention provides a transported document reading unit having a transported document readable area capable of reading a transported document and a placed document with a width larger than the reading width of the transported document readable area. A placed document reading unit having a placed document readable area that can be read with a small scanning width, and supported on one side of the previously placed placed document reading unit around a rotation axis, and opening and closing the placed document reading unit. A document holding cover unit that freely covers, and a document size detection unit that detects the size of a document placed on the document reading unit described above while the document pressing cover unit is being closed. The document set reference position in the readable area is set to the position on the rotating shaft side, and the portion on the rotating shaft side of the placed document readable area and the conveyed document readable area The portion on the rotating shaft side is Characterized in that the Kikaido axis in which is arranged at a position substantially equidistant in axial direction substantially perpendicular of the pivot shaft.

  In this case, instead of the placed document reading unit, the placed document reading section has a substantially equal width placed document reading area where the placed document can be read with substantially the same reading width as the reading width of the transported document reading area. Another substantially equal-width placed document reading unit, wherein a document setting reference position is set to a position on the rotating shaft side in the substantially equal-width placed document readable region, and the substantially equal-width placed document reading unit. The portion of the placed document readable area on the rotating shaft side is substantially perpendicular to the portion of the transported document readable area on the rotating shaft side and the axial direction of the rotating shaft from the rotating shaft. It is good also as what can be arrange | positioned arrange | positioned so that it may arrange in the position of substantially equal distance in the direction to do.

  According to the invention configured as described above, since the document setting reference position in the above-described original document readable area is set to the position on the rotating shaft side, the original and its surroundings (that is, the original placement) The boundary with the placed document reading area (not placed) is disposed at a position relatively far from the rotation axis. Therefore, the pressing surface of the document pressing cover portion and the document can be separated as much as possible while the document pressing cover portion is being closed. Accordingly, the document size can be detected in a state where the influence of the pressing surface of the document pressing cover portion is eliminated as much as possible.

  In addition, a portion on the rotating shaft side in the above-described original document readable region and a portion on the rotating shaft side in the transported document readable region are connected from the rotating shaft to the rotating shaft. Since it is disposed at a substantially equidistant position in a direction substantially orthogonal to the axial direction, the entire placed document readable area can be disposed as close to the rotating shaft as possible. For this reason, it is possible to prevent the boundary between the document and the periphery thereof from being disposed at a position far away from the rotation shaft. Therefore, the great influence of external light can be eliminated.

  Accordingly, the influence of the pressing surface of the document pressing cover part and external light can be appropriately eliminated, and the document size can be detected more accurately.

  Further, in place of the placed document reading unit described above, another document having a substantially equal width placed document readable area in which a placed document can be read with substantially the same reading width as the read width of the transported document readable area. A substantially equal-width placed document reading unit, wherein a document setting reference position is set to a position on the rotating shaft side in the substantially equal-width placed document readable region, and the substantially equal-width placed document is A portion of the readable region on the rotating shaft side is substantially perpendicular to an axial direction of the rotating shaft from the rotating shaft to a portion on the rotating shaft side of the conveyed document readable region. In the configuration in which it is possible to install the ones that are arranged at substantially equal distance positions in FIG. 1, even when such a substantially equal width placed document reading unit is installed, the document setting reference position is the rotation axis. To a position substantially equidistant in a direction substantially perpendicular to the axial direction of the pivot shaft. It becomes Rukoto. For this reason, the document size detection unit or the like can detect the document size with substantially the same configuration, and is excellent in versatility.

  The image reading apparatus according to the embodiment will be described below. In this embodiment, an example in which the image reading apparatus is applied to a digital multi-function peripheral will be described.

<1. Overall configuration of digital multifunction device>
First, the overall configuration of this digital multi-function peripheral will be described. FIG. 1 is a perspective view showing an overall configuration of a digital multifunction peripheral according to an embodiment. For convenience of explanation, each figure is provided with coordinate axes indicating the vertical direction, the front-rear direction, and the left-right direction.

  The digital multifunction device 10 is functionally roughly provided with a document reading portion and an image forming portion. These functions are used under appropriate control to realize various functions such as a FAX function, a copy function, a scan function, and a print function.

  More specifically, in the digital multi-function peripheral 10, a reading unit 30 responsible for an image reading function is disposed above the recording unit 20 responsible for an image forming function.

  The recording unit 20 is configured to form a recording sheet by performing image formation, that is, a predetermined printing process on the sheet. More specifically, the recording unit 20 has a configuration in which a printing unit 24 as a recording device is disposed above at least one paper feed cassette 22. Then, after the paper stored in the paper feed cassette 22 is fed to the printing unit 24 and printed, it is discharged to the outside as recording paper.

  The reading unit 30 is configured to read an image, that is, read information on a document as image data. Here, the reading unit 30 is configured to read a document as a flatbed (FBS) scanner and to read a document as a seed feed scanner.

  Here, the flatbed scanner is a configuration in which the original is read by scanning the reading device 38 while the original is stationary. Further, the sheet feed type scanner has a configuration in which a document is read by conveying the document with the reading device 38 disposed at a fixed position.

  More specifically, the reading unit 30 has a configuration in which a document pressing cover unit 40 is provided above an image reading main body unit 32 provided above the recording unit 20.

  The image reading main body portion 32 is configured such that a main body cover portion 34 is attached above a housing portion 33 having a substantially square shape in plan view, and various elements for reading an image as described later are provided therein. An internal space for housing is formed.

  A contact glass attachment opening 34a and a platen glass attachment opening 34b are formed on the upper surface of the main body cover 34, and a contact glass 35 and a platen glass 36 are attached to the contact glass attachment opening 34a and the platen glass attachment opening 34b, respectively.

  The platen glass 36 is formed of a substantially rectangular plate-shaped transparent member having a sufficient width that allows a document to be placed to be spread and placed. The contact glass 35 is formed of a substantially rectangular transparent member having a length according to the width of the document to be conveyed, and is located on one side edge side (here, the left side edge side) of the platen glass 36. Is provided. The size, shape, arrangement relationship and the like of these contact glass 35 and platen glass 36 will be described in detail later.

  A reading device 38 and a light receiving unit 39 are mainly provided in the internal space of the image reading main body 32.

  The reading device 38 is configured to irradiate the placed document or the conveyed document with lamp light, guide the reflected light toward the light receiving unit 39, and form an image there for reading. Here, the reading device 38 has a light source that illuminates the document, a mirror that reflects light from the document (both not shown), and the like, and a moving means (not shown) below the contact glass 35 and the platen glass 36. It is arranged so as to be able to reciprocate while maintaining the readable condition under the driving force.

  The light receiving unit 39 is configured to be able to form an image of reflected light 39L from the original with a lens on a built-in CCD (line sensor) via the reading device 38 and the like. Thereby, the reflected light from the document is converted into an electric signal by photoelectric conversion.

  The reading center of the image using the reading device 38 and the light receiving unit 39 is set so as to substantially coincide with the longitudinal center of the reading device 38, that is, the center of the contact glass 35.

  The reflected light 39L from the document may travel from the reading device 38 to the light receiving unit 39 via other reflecting means.

  When reading a document by the sheet feed method, the document is conveyed so that the document is brought into contact with the contact glass 35 by the automatic document conveying device 45 while the reading device 38 is stationary below the contact glass 35. Thus, the original is read.

  When the original is read by the flat bed method, the original is placed on the platen glass 36, and the original holding cover 40 is closed so as to press the original. The original is read by scanning the reading device 38.

  The document pressing cover unit 40 includes a document pressing unit 40 a and an automatic document conveying device 45. The document pressing cover section 40 is supported on one side of the image reading main body section 32, in other words, on one side of the platen glass 36 so as to be rotatable about a predetermined rotation shaft 34A. And the contact glass 35 is opened and closed freely.

  More specifically, the document pressing cover portion 40 is connected to one side portion (here, the rear portion) of the upper portion of the image reading main body portion 32 through a hinge 31 so as to be opened and closed. Then, the document can be placed on or removed from the platen glass 36 with the document pressing cover 40 open, and the document on the platen glass 36 and the document can be placed on the platen glass 36 with the document pressing cover 40 closed. It is held at a fixed position so as to be sandwiched between the presser portion 40a. The pressing surface of the document pressing portion 40a is substantially the same color as the document, usually white.

  In addition, the automatic document feeder 45 is provided at a position on one side upper portion (here, the upper left portion) of the document pressing portion 40 a and just above the contact glass 35. The automatic document feeder 45 conveys the documents placed on the tray so that the documents are sequentially brought into sliding contact with the contact glass 35.

  An operation panel 50 is provided on one side (front) of the reading unit 30. The operation panel 50 is provided with various switches 72 and a touch panel 74 for performing various operations on the digital multifunction peripheral 10. The touch panel 74 also functions as a display unit that displays the operation status, operation contents, and the like of the digital multi-function peripheral 10.

<2. Details of contact glass and platen glass parts>
The configuration relating to the contact glass 35 and the platen glass 36 will be described in more detail. FIG. 2 is a plan view showing the digital multifunction peripheral, and FIG. 3 is a side view showing the digital multifunction peripheral.

  As shown in FIGS. 1 to 3, the contact glass 35 is in a posture along the side edge at a position spaced from one side edge of the platen glass 36, that is, the upper surface of the main body cover 34. Is provided along the front-rear direction. Then, the document transported by the automatic document transport device 45 is fed while sliding on the contact glass 35. At this time, after the light irradiated from the side of the reading device 38 stationary below the contact glass 35 is transmitted through the contact glass 35, it is reflected by the original and is transmitted again through the contact glass 35, via the reading device 38. The original is read by forming an image on the light receiving unit 39.

  The transported document reading unit is configured to include the contact glass 35 and the reading device 38, and an overlapping area between the contact glass 35 and the reading device 38 disposed below the upper surface of the main body cover unit 34, It is set as a transported document readable area 35A where a transported document can be read. Here, the arrangement area of the contact glass 35 substantially coincides with the conveyed document readable area 35A.

  The platen glass 36 is provided on the upper surface of the main body cover portion 34 in a substantially horizontal posture. Then, the original to be read is placed on the platen glass 36 in a spread state. In this state, while the reading device 38 moves below the platen glass 36, the light irradiated from the reading device 38 side passes through the platen glass 36, and then is reflected by the placed original and again causes the platen glass 36 to be moved. The light is transmitted and imaged by the light receiving unit 39 via the reading device 38. As a result, the document placed on the platen glass 36 is read.

  The placed document reading unit is configured to include the platen glass 36 and the reading device 38, and an overlapping region between the region where the platen glass 36 exists and the movable region of the reading device 38 is placed on the upper surface of the main body cover 34. This is set as a placed document readable area 36A from which the placed document can be read. Here, the arrangement area of the platen glass 36 substantially coincides with the placed document readable area 36A.

  In addition, the reading width W1 (see FIG. 2) of the placed document readable area 36A is set smaller than the reading width W2 (see FIG. 2) of the transported document readable area 35A. Here, the reading width W1 of the placed document readable area 36A means the size of the area in a direction substantially orthogonal to the moving direction of the reading device 38, and is the same as the reading width W2 of the conveyed document readable area 35A. The dimension of the region in a direction substantially orthogonal to the moving direction of.

  For example, a specific description will be given assuming that the reading device 38 is capable of reading a short width of A3 size. In this case, the contact glass 35 having a long dimension corresponding to the short width of the A3 size (approximately the same as the short width of the A3 size or a slight extra dimension added thereto) is used. Thus, the reading width W2 of the conveyed document readable area 35A is also set to a size corresponding to the short width of the A3 size. In this case, an A3-size original can be read in the sheet feed method.

  However, even in such a case, an A3-size document can be placed as the platen glass 36 due to size restrictions (particularly, size restrictions in the left-right direction) of the digital multifunction peripheral 10 in plan view. There is a case where the size cannot be used. In such a case, a platen glass 36 having a size slightly smaller than the A3 size and a size of B4 (see reference numeral B4 in FIGS. 2 and 3) may be used. In this case, the reading width W1 of the placed document readable area 36A corresponds to the short width of the B4 size according to the size of the platen glass 36 (substantially the same as the short width of the B4 size). Or a size with a slight margin added to it).

  Such a case is assumed as a case where the reading width W1 of the above-described placed document readable area 36A is set smaller than the reading width W2 (see FIG. 2) of the conveyed document readable area 35A.

  Further, a portion 36Ae on the rotating shaft 34A side of the above-described original document readable region 36A and a portion 35Ae on the rotating shaft 34A side of the transported document readable region 35A rotate from the rotating shaft 34A. It is disposed at a substantially equidistant position in a direction substantially orthogonal to the axial direction of the shaft 34A. In other words, the portion 36Ae on the rotating shaft 34A side of the above-described placed document readable region 36A and the portion 35Ae on the rotating shaft 34A side of the transported document readable region 35A are connected to the rotating shaft 34A. It is disposed at a position that is substantially parallel and aligned on the same straight line.

  Further, the document setting reference position 37 in the placed document readable area 36A is set to the position on the rotation shaft 34A side in the placed document readable area 36A. That is, normally, when detecting the size of the placed document and reading the document, various sizes and sizes standardized with respect to one of the four corners of the substantially square-shaped placed document readable area 36A and The document is read. The document set reference position 37 is a position that serves as a reference for such document size detection and reading. The user places the document on the platen glass 36 so that one corner of the document is aligned with the document set reference position 37. It is requested to be placed.

  Here, the document setting reference position 37 is set at the corner on the rotating shaft 34A side and the conveyed document readable region 35A side in the placed document readable region 36A. Normally, such a document setting reference position 37 is indicated by a mark 37M such as an arrow or a triangle mark.

<3. Configuration related to document size detection>
In this apparatus, when the document is read by the sheet feed method, when the document pressing cover 40 is to be closed, the size of the document placed on the platen glass 36 is detected in the middle of the operation. Here, a configuration relating to the document size detection, in particular, a configuration for detecting a size (hereinafter simply referred to as “document width”) in the reading widths W1 and W2 among the document sizes will be described. FIG. 4 is a block diagram showing a configuration relating to document size detection.

  That is, the cover open / close detection unit 64 is connected to the control unit 60, and the reading device 38 and the light receiving unit 39 are connected to the control unit 60.

  When the cover opening / closing detection unit 64 detects that the document pressing cover unit 40 has been opened, the reading device 38 moves to a predetermined document width detection position. The document pressing cover unit 40 is configured to detect a state during the closing operation of the document pressing cover unit 40 while the document pressing cover unit 40 is being closed and to output a detection signal corresponding thereto. Specifically, the cover open / close detection unit 64 includes a protruding portion that protrudes upward and downward from the main body cover portion 34, a micro switch, and the like. In the middle of closing the document pressing cover 40, the lower surface of the document pressing cover 40 pushes the protruding portion to turn on the micro switch. A detection signal corresponding to the ON signal is supplied to the control unit 60.

  The control unit 60 includes a CPU, a RAM, a RAM storage unit, and the like, and has a function as the document width determination unit 61 that determines the document width. That is, when the document width determination unit 61 determines that the document pressing cover unit 40 is in the process of being closed according to the detection signal from the cover open / close detection unit 64, the document reading operation is instantaneously performed by the reading device 38 and the light receiving unit 39. Give instructions to do. As a result, at least one line of original is read in the original width direction. Note that this one-line document reading is performed in the entire longitudinal direction of the reading device 38.

  In the standby state after reading the document for size determination as described above (in a state where the document can be read by the flat bed method and the document pressing cover portion 40 is closed), the reading device 38 is connected to the contact device 38. It moves below the glass 35 and stands by.

  Then, the document width determination unit 61 determines the boundary between the document existing region and the document existing region based on the intensity distribution of the image read signal for one line from the light receiving unit 39. Then, the document width is determined based on the determined boundary with reference to the portion 36Ae on the rotation shaft 34A side of the placed document readable area 36A. The control unit 60 uses the determined document width for various controls such as determination of a target area when reading a document and determination of magnification when copying.

  The cover opening / closing detection unit 64, the control unit 60, the reading device 38, and the light receiving unit 39 have a function as a document size detection unit that detects the size of a document placed while the document pressing cover unit 40 is being closed. is doing.

  The control unit 60 is connected to various configurations of the digital multifunction peripheral 10 and performs overall control of the digital multifunction peripheral 10.

<4. Operation explanation>
An operation of the digital multi-function peripheral 10 will be described. In the digital multi-function peripheral 10, as shown in FIG. 3, the document width of the placed document is determined while placing the document on the platen glass 36 and closing the document pressing cover 40.

  At this time, the document setting reference position 37 in the placed document readable area 36A is set to the position on the rotating shaft 34A side in the placed document readable area 36A. In many cases, it is assumed that the document width is more than half the reading width W1 of the placed document readable area 36A. For this reason, the boundary between the document and the periphery thereof is disposed at a position relatively far from the rotation shaft 34A. Therefore, when detecting the document size while closing the document pressing cover 40, the boundary between the document and its periphery and the pressing surface of the document pressing cover 40 can be separated by a relatively far distance D1. Therefore, the document size can be detected in a state where the influence of the pressing surface of the document pressing cover 40 is eliminated as much as possible.

  Incidentally, it is assumed that the document setting reference position 37 in the placed document readable area 36A is set at a position farther from the rotation shaft 34A in the placed document readable area 36A. In this case, in many cases, the boundary between the document and its surroundings is disposed at a position relatively close to the rotation shaft 34A. For this reason, the distance D2 between the boundary between the document and its periphery and the pressing surface of the document pressing cover 40 is relatively short. The pressing surface of the document pressing cover 40 is white with the same color as the normal document. Accordingly, when the document pressing cover 40 is quickly closed with respect to the document and its surroundings, the difference in the intensity of the image reading signal is reduced, and it may be difficult to detect the document size.

  In particular, as compared with such a case, when the document setting reference position 37 in the placed document readable area 36A is set to the position on the rotating shaft 34A side in the placed document readable area 36A, the document presser cover. It can be understood that the document size can be detected in a state where the influence of the pressing surface of the unit 40 is eliminated as much as possible.

  On the other hand, when the boundary between the document and its surroundings is at a position extremely away from the rotation shaft 34A side and is hardly covered by the document pressing cover 40, the external light L (see FIG. 3). Will be inserted at the boundary between the document and its surroundings. Such external light L makes it difficult to detect the document size. This is because the disturbance output by the external light L or the like increases the output of the area where there is no document, making it difficult to distinguish the boundary from the area where the document exists.

  Therefore, in this apparatus, the portion 36Ae on the rotating shaft 34A side of the placed document readable region 36A and the portion 35Ae on the rotating shaft 34A side of the transported document readable region 35A are connected to the rotating shaft. It is arranged at a substantially equidistant position in a direction substantially orthogonal to the axial direction of the rotation shaft 34A from 34A. For this reason, the entire placed document readable area 36A can be disposed as far back as possible near the rotation shaft 34A, and the boundary between the document and the periphery thereof is disposed at a position covered to some extent by the document pressing cover 40. Can be set. For this reason, the great influence of external light can be eliminated.

  By doing so, the boundary portion between the document and the surrounding area is appropriately separated from the pressing surface of the document pressing cover portion 40 in the middle of closing the document pressing cover portion 40 in many scenes assumed to be used. And can be disposed at an appropriate position covered to some extent by the document presser cover portion 40. Thereby, the influence of the pressing surface of the document pressing cover portion 40 and the external light can be appropriately eliminated, and the document size can be detected more accurately.

<5. Modification>
FIG. 5 is a plan view for showing a modification. In the above embodiment, the description has been given of the example in which the placed document reading unit in which the reading width W1 of the placed document readable area 36A is set smaller than the reading width W2 of the transported document readable area 35A is provided. Another substantially equal width placed document reading section having a substantially equal width placed document readable area 136A that can read a document to be read with a reading width W3 that is substantially the same as the reading width W1 of the conveyed document readable area 35A can be installed. It may be a simple configuration.

  That is, a configuration in which a substantially equal-width placed document reading unit is installed will be described. In the digital multifunction peripheral 110 according to the present modification, a platen glass mounting opening 134b larger than the platen glass mounting opening 34b as the main body cover unit 134. The thing which has is used. The other configuration of the main body cover portion 134 is substantially the same as that of the main body cover portion 34.

  Further, the platen glass 136 attached to the platen glass attachment opening 134b is substantially the same as the length of the contact glass 35 in the longitudinal direction of the contact glass 35. The dimensions are substantially the same.

  The substantially equal width placed original reading unit includes the platen glass 136 and the reading device 38. Then, an overlapping area between the platen glass 136 and the moving area of the reading device 38 disposed below the platen glass 136 is set as a substantially equal width placed original readable area 136A from which the placed original can be read. The reading width W3 of the substantially equal width placed original readable area 136A is substantially the same as the reading width W2 of the conveyed original readable area 35A.

  More specifically, when the reading width W2 of the conveyed document readable area 35A is set to a dimension that can read the short width of the A3 sheet, the reading width W3 of the substantially equal width placed document readable area 136A is also set. A3 (see symbol A3 in FIG. 5) The short width of the paper is set to a readable size.

  Further, the document setting reference position 137 in the substantially equal width placed document readable area 136A is set at the corner on the rotating shaft 34A side and the conveyed document readable area 35A side. Further, the portion 136Ae on the rotating shaft 34A side of the substantially equi-width placed document readable region 136A and the portion 35Ae on the rotating shaft 34A side of the conveyed document readable region 35A are from the rotating shaft 34A. In the direction substantially orthogonal to the axial direction of the rotating shaft 34A, they are arranged at substantially equal distance positions.

  That is, in this modification, instead of the main body cover portion 34, a main body cover portion 134 including the contact glass 35 similar to that of the above embodiment and the platen glass 136 as described above can be attached.

  Even in this case, the distance between the document setting reference position 137 and the rotation shaft 34A is substantially equal to the distance between the document setting reference position 37 and the rotation shaft 34A in the embodiment in a direction substantially orthogonal to the axial direction of the rotation shaft 34A. Arranged at the same position. For this reason, the document width determination unit 61 can detect the document size with reference to the same position as in the above embodiment. For this reason, as the configuration relating to the document size detection, it is possible to detect the document size with substantially the same configuration only by slightly changing the range of the document size detection width and the like.

  The explanation is as follows. That is, in the manufacturing stage, the main body cover portion 34 including the contact glass 35 and the platen glass 36 as described in the embodiment, and the main body including the contact glass 35 similar to the above embodiment and the platen glass 136 as described above. The cover part 134 is prepared. Then, the former main body cover portion 34 and the latter main body cover portion 134 can be alternatively selected, and assembly to other common parts can be performed. For this reason, it is possible to manufacture a plurality of types of digital multifunction peripherals 10 and 110 having a plurality of reading widths for reading a placed document by using many parts, particularly parts related to detection of the document size. .

  Further, the present invention is not limited to the above embodiment and the above modified examples, and various other modifications are possible.

  For example, although the contact glass 35 and the platen glasses 36 and 136 are attached to the main body cover portions 34 and 134 which are common parts in the above-described embodiment and the modification, they may be attached to separate parts.

  Further, the document size detection need not be performed using the reading device 38 as described above, but may be performed using a sensor dedicated to size detection.

  In this embodiment, the image reading apparatus is described as an example applied to a digital multi-function peripheral having various functions such as a FAX function, a copy function, a scan function, and a print function. However, the present invention is not necessarily limited thereto. In other words, the present invention can be applied to various reading devices capable of reading an image by both a flat bed method and a sheet feed method.

1 is a perspective view illustrating an overall configuration of a digital multifunction peripheral according to an embodiment. It is a top view which shows a digital multifunctional device same as the above. It is a side view which shows a digital multifunctional device same as the above. FIG. 3 is a block diagram illustrating a configuration related to document size detection. It is a top view for showing a modification.

Explanation of symbols

10, 110 Digital MFP 34A Rotating shaft 35 Contact glass 35A Transported document readable area 35Ae Rotating shaft side portion of transported document readable area 36,136 Platen glass 36A Placed document readable area 36Ae Placed document readable area Parts 37, 137 Document setting reference position 38 Reading device 39 Light receiving unit 40 Document pressing cover unit 45 Automatic document conveying device 60 Control unit 61 Document width determination unit 64 Cover open / close detection unit 136A Substantially uniform document reading area W1 Reading width of the placed document readable area W2 Reading width of the conveyed document readable area W3 Approximate width Reading width of the placed document readable area

Claims (2)

A transported document reading section having a transported document readable area capable of reading a transported document;
A placed document reading unit having a placed document readable area capable of reading a placed document with a reading width smaller than a reading width of the transported document readable area;
A document holding cover part supported on one side of the above-described placed document reading unit around a rotation axis, and covering the placed document reading unit so as to be freely opened and closed;
A document size detection unit that detects the size of a document placed on the placed document reading unit while the document pressing cover unit is being closed;
With
The document set reference position in the above-described original document readable area is set to the position on the rotating shaft side, and
The rotation axis side portion of the placed document readable area and the rotation axis side portion of the conveyed document readable area are axial directions of the rotation axis from the rotation axis. The image reading apparatus is disposed at a substantially equidistant position in a direction substantially perpendicular to the horizontal axis. The image reading apparatus according to claim 1,
In place of the document reading section described above,
Another substantially equal-width placed document reading unit having a substantially equal-width placed document readable area capable of reading a placed document with a reading width substantially the same as the reading width of the transported document readable area, A document set reference position is set to a position on the rotating shaft side in the substantially equal width placed document readable area, and a position on the rotating shaft side in the substantially equal width placed document readable area is set. The portion is arranged at a substantially equidistant position in the direction substantially perpendicular to the axial direction of the rotational shaft from the rotational shaft with respect to the portion on the rotational shaft side in the conveyed document readable region. An image reading apparatus characterized in that it can be installed.

Images