JP4232572B2 - Image reading device - Google Patents

Description

  The present invention relates to an image reading apparatus.

  There is known a so-called flatbed type image reading apparatus that includes a document table on which a document is placed on an upper wall portion of a housing and conveys an image sensor in a sub-scanning direction to read the document. Such an image reading apparatus includes an original holder that supports a transparent original such as a film, and reads an original that is supported by the original holder and placed on an original table (see, for example, Patent Document 1). ).

  A so-called multi-function machine in which an image reading device and a printer are integrated is known. According to such a multifunction machine, a document can be copied by reading the document with an image reading device and printing the created digital image with a printer. In this case, if reading and printing are performed in parallel, the time required for copying can be shortened.

JP 2003-5304 A

  When reading a document supported by the document holder, there is a problem that vibration is generated during reading due to rotation of a motor that conveys the image sensor or movement of a carriage, and the document holder is displaced due to the vibration. If the document holder is misaligned during reading, the created digital image will be miscolored and the image quality will deteriorate. Further, in the case of a multifunction machine, the vibration due to the reciprocating movement of the recording head during printing is large, so that it vibrates more intensely than in the case of the image reading apparatus alone. For this reason, when copying a document, if reading and printing are performed in parallel, the image quality of the digital image created on the image reading apparatus side will be further deteriorated.

  Further, when reading a document, unless the document is accurately positioned in the reading area on the document table, an area that should be read out of the reading area cannot be read, and an unnecessary area is generated in the digital image instead. Therefore, the document holder needs to accurately position the document in the reading area. Specifically, for example, the document holder is accurately positioned in the main scanning direction and the sub-scanning direction, the inclination of the document holder with respect to the document table is reduced, so-called skew is reduced, and the document positioning accuracy with respect to the document holder itself is improved. Is required.

  The present invention has been created in view of such problems, and an object of the present invention is to provide an image reading apparatus that accurately positions a document and prevents image quality deterioration due to vibration.

  In order to achieve the above object, an image reading apparatus according to the present invention includes a first document window in which a document is accommodated, and a first document support unit that positions and supports the document in the first document window. A holder, a transparent rectangular manuscript table provided on the upper wall portion of the housing for placing the manuscript holder, and the manuscript holder provided on the upper wall portion on the manuscript table Positioning means for positioning, a fitting portion provided in the vicinity of one side of the document table and an engaging portion provided in the vicinity of the one side, separated from the fitting portion by a predetermined distance along the one side Positioning means having an engaging portion provided; an image sensor that photoelectrically converts an optical image of a document supported on the document holder placed on the document table; and outputs an electrical signal; and the image Sensor in the sub-scan direction Sub-scanning means for feeding, and the document holder has first fitting means for fitting into the fitting portion and first engaging means for engaging with the engaging portion. Features. According to this image reading apparatus, since the fitting portion and the engaging portion are provided in the vicinity of the same one side of the document table, the positional accuracy of the engaging portion with respect to the fitting portion in the main scanning direction, or with respect to the engaging portion. It is easy to improve the position accuracy of the fitting portion in the main scanning direction. As a result, the positioning accuracy of the document holder in the main scanning direction can be improved, and the skew of the document holder with respect to the document table can be reduced. Therefore, the document positioning accuracy can be improved. Further, since the document holder can be fixed to the housing, the document holder is not displaced from the document table even if vibration occurs. For this reason, the influence of vibration on the digital image to be created can be reduced. Therefore, according to this image reading apparatus, it is possible to accurately position the document and to prevent deterioration in image quality due to vibration.

  Further, in the image reading apparatus according to the present invention, the first fitting means has a cylindrical boss, and the fitting portion is a circular hole provided near the origin of the document table. To do. According to this image reading apparatus, since the fitting portion is provided in the vicinity of the origin, the position accuracy of the fitting portion with respect to the origin can be improved, and the original can be positioned more accurately. In addition, when the boss and the hole are made circular, the accuracy of the boss and the hole is easily improved as compared with the case where the boss and the hole are made square, for example.

  Further, in the image reading apparatus according to the present invention, the first engagement means has a cylindrical boss, and the engagement portion is a groove extending along the one side and has a width in the short direction. It is a groove that matches the outer diameter of the boss of one engaging means. According to this image reading apparatus, since the document holder is positioned by the fitting portion in the direction parallel to the one side, the engaging portion may be positioned only in the direction intersecting the one side. When the engaging portion is provided as a groove, only the positioning accuracy in the intersecting direction needs to be ensured, so that the formation of the engaging portion is facilitated and the first engaging means is engaged as compared with the case where it is provided as a hole. It becomes easy to let.

  Furthermore, in the image reading apparatus according to the present invention, when the first fitting means is fitted to the fitting portion and the first engaging means is engaged to the engaging portion, the first fitting means The document support means supports the document substantially at the center of the document table in the main scanning direction. If the document is supported at the center of the document table, the image quality can be improved compared to the case where the document is supported at a position shifted from the center.

  Further, in the image reading apparatus according to the present invention, the first document window is formed in a rectangular shape, and the first document support means includes a frame member that supports the document and is fitted to the first document window; And a pressing means provided on an inner peripheral wall of the first document window for pressing and positioning the frame member toward the opposing inner peripheral wall. According to this image reading apparatus, the document can be accurately positioned with respect to the document holder.

  Further, in the image reading apparatus according to the present invention, the document holder positions and supports the document in a second document window in which a document of a different type from the first document window is accommodated, and the second document window. A second document supporting means; a second fitting means for fitting into the fitting portion; and a second engaging means for engaging with the engaging portion; When the means is fitted into the fitting portion and the second engagement means is engaged with the engagement portion, the second document support means causes the document to move substantially in the main scanning direction of the document table. It is supported at the center. According to this image reading apparatus, two types of documents can be supported at the center of the document table by one document holder. For this reason, the image quality can be improved for any type of document with fewer document holders than the document types.

The functions of the plurality of means provided in the present invention are realized by hardware resources whose functions are specified by the configuration itself, hardware resources whose functions are specified by a program, or a combination thereof. The functions of the plurality of means are not limited to those realized by hardware resources that are physically independent of each other.
The present invention can be specified not only as an apparatus invention but also as a program invention, a recording medium recording the program, and a method invention.

Hereinafter, embodiments of the present invention will be described based on examples. In this embodiment, a so-called multi-function machine in which an image reading apparatus and a printer are integrated will be described as an example.
FIG. 2 is a schematic diagram showing the multifunction machine 1 in which an image reading apparatus according to an embodiment of the present invention is integrated. The multifunction machine 1 includes a scanner unit 2 and a printer unit 3 as image reading devices. The document cover 11 is coupled to the housing 12 so as to be swingable from a posture in which the plate surface of the document table 61 is opened by a hinge to a posture in which the plate surface of the document table 61 is covered. The document cover 11 presses the document holder 80 placed on the surface of the document table 61, and light other than the radiated light from the transmissive document light source 33a (see FIG. 3) or the reflected document light source 33b (see FIG. 3) is emitted from the document. The document table 61 is covered so that the holder 80 is not illuminated. The multi-function device 1 can also read a reflective document placed directly on the document table.

FIG. 3 is a schematic diagram illustrating the configuration of the multifunction device 1, and FIG. 4 is a block diagram illustrating the hardware configuration of the multifunction device 1.
The linear image sensor 30 is mounted on the carriage 31 in such a manner that light receiving elements such as photodiodes are arranged in a straight line in the direction perpendicular to the paper surface in FIG. The linear image sensor 30 accumulates charges obtained by photoelectric conversion of light in a predetermined wavelength region such as visible light, infrared light, ultraviolet light, etc. in a light receiving element for a certain period of time, and performs an electric according to the amount of light received for each light receiving element. The signal is output using a CCD (Charge Coupled Device), a MOS transistor switch or the like.

  The reduction optical system 32 includes a transmissive original light source 33a, a reflective original light source 33b, a mirror 34, a lens 35, and the like. The reflective original light source 33 b, the mirror 34, and the lens 35 are mounted on the carriage 31, and the transparent original light source 33 a is accommodated in the original cover 11. The transmissive original light source 33a is constituted by a tube illumination device such as a fluorescent tube lamp. When reading a transparent document placed on the document holder 80, the light source 33a for the transparent document is turned on, and the mirror 34 and the lens 35 form a transmitted light image on the scanning line of the irradiated transparent document on the linear image sensor 30. Let As a result, the optical image on the main scanning line of the transparent original is input to the linear image sensor 30.

The first main scanning drive unit 36 (see FIG. 4) is a drive circuit that outputs drive pulses necessary for driving the linear image sensor 30 to the linear image sensor 30. The first main scanning drive unit 36 includes, for example, a synchronization signal generator, a driving timing generator, and the like.
A first sub-scanning drive unit 37 (see FIG. 4) as sub-scanning means is installed perpendicularly to the longitudinal direction of the linear image sensor 30 and has a slide shaft 38 slidably holding the carriage 31, a carriage motor 39, and a drive. A belt 40, a drive circuit, and the like are provided. Since the carriage motor 39 pulls the carriage 31 with the drive belt 40, the linear image sensor 30 and the document holder 80 move relative to each other in the direction W (sub-scanning direction) perpendicular to the scanning line, so that a two-dimensional image can be scanned. It becomes.

  An AFE (Analog Front End) unit 41 (see FIG. 4) includes an analog signal processing unit, an A / D converter, and the like. The analog signal processing unit subjects the electrical signal output from the linear image sensor 30 to analog signal processing such as amplification and noise reduction processing, and outputs the result. The A / D converter quantizes the electrical signal output from the analog signal processing unit into an output signal of a digital representation having a predetermined bit length, and outputs the output signal.

  The digital image processing unit 42 (see FIG. 4) performs processes such as gamma correction, interpolation of defective pixels by the pixel interpolation method, shading correction, and sharpening of the image signal on the output signal output from the AFE unit 41. Create a digital image. The various processes performed by the digital image processing unit 42 may be replaced with processes by a computer program executed by the control unit 56.

  The recording head 43 is provided on the carriage 44 and includes a plurality of nozzles 45 that eject ink, a piezo element 46, an ink passage 47 that guides ink, and the like. The piezo element 46 is provided at a position in contact with the side wall of the ink passage 47, and rapidly expands to deform the side wall of the ink passage 47 when a driving voltage is applied. The volume of the ink passage 47 contracts according to the expansion of the piezo element 46, and ink corresponding to the contraction is ejected from the nozzle 45 at a high speed.

The head drive unit 48 (see FIG. 4) is a circuit that applies a drive voltage to the piezo element 46 based on the print signal output from the control unit 56 (see FIG. 4).
The second main scanning drive unit 49 (see FIG. 4) includes a slide shaft 51 that is laid in parallel with the axis of the platen 50 and slidably holds the carriage 44, a carriage motor 52, a drive belt 53, a drive circuit, and the like. . When the carriage motor 52 pulls the carriage 44 by the drive belt 53, the recording head 43 reciprocates in the axial direction of the sliding shaft 51.

  The second sub-scanning drive unit 54 (see FIG. 4) includes a paper feed motor 55, a gear train that transmits the rotation of the paper feed motor 55 to the platen 50 and a paper transport roller (not shown), a drive circuit, and the like. As the paper feed motor 55 rotates the platen 50 and a paper transport roller (not shown), the printing paper M moves in a direction perpendicular to the paper surface (sub-scanning direction) in FIG. 3 intersecting the main scanning direction axis.

  As shown in FIG. 4, the control unit 56 includes a CPU 57, a ROM 58, and a RAM 59. The CPU 57 executes computer programs stored in the ROM 58 and controls each unit of the multifunction machine 1. The ROM 58 is a memory that stores various programs and data, and the RAM 59 is a memory that temporarily stores various programs and data.

  The operation unit 17 includes a read button, a copy button, a print button, and a plurality of buttons such as an upper button and a lower button for selecting an image to be copied from an image read by pre-scanning or selecting a setting item from a predetermined menu. A push button, a display device for displaying images and menus read by pre-scanning, an LED for notifying an error, and the like are provided. The user can input printing and other necessary instructions to the multifunction device 1 by operating these various buttons. The control unit 56 and the operation unit 17 function as both the scanner unit 2 and the printer unit 3.

Next, the positioning means will be described.
FIG. 5 is a top view of the housing 12. FIG. 5 shows a state where the document cover 11 is removed. In the figure, the X direction indicates the main scanning direction, and the Y direction indicates the sub scanning direction. A rectangular opening is formed in the upper wall 71 of the housing 12 and is closed by a document table 61 such as a transparent glass plate. A fitting portion 62 formed as a circular hole is provided in the upper wall portion 71 of the housing 12 in the vicinity of the origin Q of the document table 61. If the fitting portion 62 is formed in the vicinity of the origin Q, the distance between the origin Q and the fitting portion 62 is shortened. Therefore, compared to the case where the fitting portion 62 is away from the origin Q, the fitting portion 62 is closer to the main scanning direction and the sub-scanning direction. Easy to improve position accuracy. The position accuracy of the fitting portion 62 with respect to the origin Q affects the position accuracy of the document with respect to the origin Q. Therefore, if the position accuracy of the fitting portion 62 is improved, the document can be accurately positioned with respect to the origin Q as a result. . Further, when the fitting portion 62 is formed as a circular hole, the circular hole is more accurate than a square or the like, so that there is an effect that manufacture is facilitated. The engaging portion 63 is formed as a groove at a position in the vicinity of the document table 61 and spaced from the fitting portion 62 along one side 64 of the document table 61 by a predetermined distance. The engaging portion 63 has a width in the a direction, which is the short direction, of a cylindrical boss possessed by a first engaging means described later and an outer side of a cylindrical boss possessed by a second engaging means described later. It is formed to match the diameter. Since the document holder 80 is positioned by the fitting portion 62 in the direction parallel to the side 64, the engaging portion 63 only needs to ensure the positioning accuracy in the direction intersecting the side 64. When the engaging portion 63 is formed as a groove, it is only necessary to ensure the positioning accuracy in the intersecting direction, so that the engaging portion 63 can be easily formed. Further, when the engaging portion 63 is formed as a groove, there is an effect that the first engaging means described later can be easily engaged as compared with the case where the engaging portion 63 is formed as a circular hole. Further, when the engaging portion 63 is provided in the vicinity of the document table 61, it is easy to improve the positional accuracy of the engaging portion 63 with respect to the side 64 as compared with the case where the distance between the engaging portion 63 and the document table 61 is large. If the position accuracy of the engagement portion 63 with respect to the side 64 is low, the document holder 80 is inclined with respect to the side 64 due to the influence of the engagement portion 63 even if the document holder 80 is accurately formed. Position accuracy will be reduced. When the engaging portion 63 is provided in the vicinity of the document table 61, the positional accuracy of the engaging portion 63 can be improved, and the positional accuracy of the document can be improved.

Next, the document holder 80 will be described.
6A is a top view of the surface of the document holder 80, and FIG. 6B is a side view. FIG. 7 is a top view of the back surface of the document holder 80. The document holder 80 includes a holder body 81, a plurality of first document windows 82, a second document window 83, a first fitting portion 87 as a first fitting means, and a first as a first engaging means. An engagement portion 86, a second engagement portion 84 as a second engagement means, a second engagement portion 85 as a second engagement means, a frame member 88 as a first document support means, and a first A frame member 89 is provided as second document supporting means.

The plurality of first document windows 82 are rectangular openings provided in the holder main body 81. The inner peripheral shape of the first document window 82 is formed to substantially match the outer peripheral shape of the frame member 88. The first document window 82a is shown with the reference numerals of the respective parts omitted.
The first document support means is provided for each first document window 82, and each first document support means includes a frame member 88 and two claw portions 89 as pressing means. The frame member 88 is composed of an upper member and a lower member, and supports the transparent original M by holding the edge of the transparent original M between the upper member and the lower member. The frame member 88 is fitted to the first document window 82 in a state where the document holder 80 is placed on the document table 61. Two adjacent inner peripheral walls of the first document window 82 are provided with two concave portions 91, and the claw portion 89 is an inner peripheral wall facing the inner peripheral wall where the concave portion 91 is formed from the concave portion 91. It protrudes to the side and is formed in a shape that bends and extends in a direction that intersects the protruding direction. The front end portion of the claw portion 89 is provided with an abutting portion 90 that slightly protrudes to the opposing inner peripheral wall side. The claw portion 89 has elasticity, and when the frame member 88 is fitted to the first document window 82, the one abutment portion 90 presses against the opposing inner peripheral wall side, thereby causing the frame member 88 to be a. The frame member 88 is positioned in the b direction when the other claw portion 89 is pressed in the same manner. As a result, the transparent original M is accurately positioned with respect to the original holder 80. The abutting portion 90 is formed with a slope inclined in the direction a from the front end side in the direction intersecting the front surface to the back surface side, and when the frame member 88 is fitted to the first document window 82, the frame member 88. Will be guided to the slope. For this reason, it is easy to fit the frame member 88.

  The second document support means includes a frame member 89 and a step portion formed around the second document window 83. The second document window 83 is a rectangular opening for receiving a strip film. The step portion is formed as a recess having a shape that matches the shape of the frame member 89, and a plurality of protrusions 97 for engaging with a plurality of engagement holes provided in the strip film are formed on the second document window 83. It is formed along both sides in the longitudinal direction. Note that the reference numerals of the protrusions 97 are omitted in the figure except for one. The frame member 89 is provided with a plurality of fitting holes 92 corresponding to the protrusions 97 on the stepped portion, and the strip film is positioned so that the protrusions 97 on the stepped portion pass through the corresponding locking holes. The frame member 89 is positioned so that the protrusions 97 are fitted in the corresponding fitting holes 92 from above, and fitted into the stepped portions. Further, a locking claw 99 is provided in the step portion, and a locking hole 98 is provided in the frame member 89. When the frame member 89 is fitted into the stepped portion, the locking claw 99 is locked in the locking hole 98, whereby the strip film is supported by the document holder 80.

  The first fitting portion 87 is formed so as to protrude from the document holder 80 in the lateral direction of the document holder 80. The first engaging portion 86 protrudes in the same direction as the first fitting portion 87 from a position separated from the first fitting portion 87 by a predetermined distance in the longitudinal direction. As shown in FIG. 7, the first fitting portion 87 and the first engaging portion 86 include columnar bosses 94 and 93 protruding from the back surface side. The boss 94 of the first fitting portion 87 is fitted into the fitting portion 62, and the boss 93 of the first engaging portion 86 is engaged with the engaging portion 63. When the first fitting portion 87 is fitted and the first engaging portion 86 is engaged, the first document window 82 is positioned substantially at the center of the document table 61. Accordingly, the document is supported at the center of the document table 61 in the main scanning direction. When the reduction optical system is used, an image with no distortion is formed on the linear image sensor 30 as near the center of the document table 61, so that the image quality can be improved by supporting the document at the center.

  The second fitting portion 84 protrudes from the document holder 80 in a direction opposite to the first fitting portion 87 in the short direction of the document holder 80. The second engaging portion 85 protrudes in the same direction as the second fitting portion 84 from a position separated from the second fitting portion 84 by a predetermined distance in the longitudinal direction. Similarly, the second fitting portion 84 and the second engaging portion 85 are provided with bosses 95 and 96 projecting in a cylindrical shape from the back side as shown in FIG. The boss 95 of the second fitting portion 84 is fitted to the fitting portion 62, and the boss 96 of the second engaging portion 85 is engaged to the engaging portion 63.

  FIG. 1 is a perspective view showing a state in which the document holder 80 is positioned on the document table 61. FIG. 1 shows a case where the second fitting portion 84 is fitted to the fitting portion 62 and the second engaging portion 85 is engaged to the engaging portion 63. As shown in the drawing, when the document holder 80 is positioned by the second fitting portion 84 and the second engagement portion 85, the second document window 83 is positioned substantially at the center of the document table 61.

FIG. 8 is a flowchart showing the flow of processing of the multifunction device 1. In the following description, an example in which a document supported by the first document window 82 is copied will be described.
In S105, pre-scanning is executed to create a low-resolution digital image. After creation, an area on the digital image corresponding to the area inside the first document window 82 is cut out from the created digital image. That is, an area representing each original is cut out.
In S110, the user confirms the digital image created by the pre-scan on the LCD and selects an image to be printed. Specifically, the image of each document cut out in S105 is displayed on the LCD, and the user operates the operation unit 17 to select the document to be copied.

In steps S <b> 115 to S <b> 120, the printer unit 3 performs printing while the scanner unit 2 performs the main scan. Specifically, for example, in S120, the carriage motor 39 is first rotated by a predetermined step to move the linear image sensor 30 to the starting end in the sub-scanning direction of the reading area that is a predetermined distance away from the origin Q, and one line is read. The main scanning direction of the reading area is determined in advance by designating the range of the light receiving element used for reading. It should be noted that the reading area is determined according to the type of document by designating the type of document or by reading and determining the position of a mark formed on the document holder. When one line is read, the read one line data is subjected to predetermined image processing and binarization processing, and the second main scanning drive unit 49 and the second sub-scanning drive unit 54 are controlled to perform printing. Execute. In S120, printing may be performed every time a predetermined plurality of lines are read.
In S125, it is determined whether reading and printing for the entire reading area are completed. If completed, the process ends. If not completed, the process returns to S115 and repeats the processes from S115 to S120 until it is completed.

  According to the MFP 1 according to the embodiment of the present invention described above, the fitting portion 62 and the engaging portion 63 are provided along the same one side 64 of the document table 61. It is easy to improve the positional accuracy of the joint portion 63 in the main scanning direction or the positional accuracy of the fitting portion 62 with respect to the engaging portion 63 in the main scanning direction. Specifically, since the fitting portion 62 and the engaging portion 63 are along the same one side 64 extending in the sub-scanning direction of the document table 61, the sides of the fitting portion 62 and the engaging portion 63 are each side. If the accuracy of the distance in the main scanning direction from 64 is improved, as a result, the position accuracy of the engaging portion 63 with respect to the fitting portion 62 in the main scanning direction or the fitting portion 62 with respect to the engaging portion 63 in the main scanning direction is consequently obtained. Position accuracy will be improved. Since the fitting part 62 and the engaging part 63 are each provided in the vicinity of the document table 61, the distance from the document table 61 is short, and therefore the positional accuracy with respect to the document table 61 is easily improved. Accordingly, when the fitting portion 62 and the engaging portion 63 are provided along the same side of the document table 61, the positional accuracy of the engaging portion 63 with respect to the fitting portion 62 in the main scanning direction or the fitting portion 63 is fitted. It is easy to improve the position accuracy of the joining portion 62 in the main scanning direction. As a result, the positioning accuracy of the document holder 80 in the main scanning direction can be improved, and the skew of the document holder 80 with respect to the document table 61 can be reduced. Therefore, the document positioning accuracy can be improved. Further, according to the multifunction machine 1, since the document holder 80 can be positioned with respect to the document table 61, the relative relationship between the document holder 80 and the document table 61 even if vibration occurs due to the movement of the recording head during copying. The position does not change. For this reason, the influence of vibration on the digital image to be created can be reduced. Therefore, according to the multifunction device 1, it is possible to position the document with high accuracy and to prevent deterioration in image quality due to vibration.

  Further, according to the multifunction device 1, since the fitting portion 62 is provided in the vicinity of the origin Q, the positioning accuracy of the document holder 80 in the sub-scanning direction can be improved. The position accuracy in the main scanning direction and the position accuracy in the sub-scanning direction with respect to the origin Q are easier to improve as the origin Q is closer. Therefore, when the fitting portion 62 is provided in the vicinity of the origin Q, the sub-scanning direction of the fitting portion 62 with respect to the origin Q can be improved. For this reason, the document holder 80 can be accurately positioned in the sub-scanning direction, and therefore the document can be positioned more accurately.

  Further, according to the multifunction device 1, the document can be accurately positioned with respect to the first document window 82. Even if the document holder 80 is accurately positioned, if the document is not accurately positioned in the first document window 82, the position accuracy of the document with respect to the origin Q is lowered as a result. Since the multifunction device 1 has the claw portion 89, the document can be accurately positioned with respect to the first document window 82 by pressing the frame member 88. For this reason, the original can be more reliably positioned with respect to the origin Q.

  In the present embodiment, the multifunction device 1 has been described as an example of the image reading device. However, the image reading device may be a flatbed image scanner. In this case, it is possible to prevent deterioration in image quality due to vibration of the motor that conveys the image sensor.

1 is a perspective view of a document holder and a document table according to an embodiment of the present invention. 1 is a schematic diagram of an image reading apparatus according to an embodiment of the present invention. 1 is a schematic diagram illustrating a configuration of an image reading apparatus according to an embodiment of the present invention. 1 is a schematic diagram illustrating a configuration of an image reading apparatus according to an embodiment of the present invention. 1 is a top view of an image reading apparatus according to an embodiment of the present invention. (A) is a top view of the surface of the document holder according to one embodiment of the present invention, (B) is a side view. FIG. 6 is a top view of the back surface of the document holder according to the embodiment of the present invention. The flowchart which concerns on one Example of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Multifunctional device, 2 Scanner part (image reading apparatus), 12 Housing | casing, 30 Linear image sensor, 37 1st sub-scanning drive part (sub-scanning means), 61 Document stand, 62 Fitting part, 63 Engaging part, 71 Upper wall portion, 80 Document holder, 82 First document window, 83 Second document window, 84 Second fitting portion (second fitting means), 85 Second engagement portion (second engagement means) ), 86 First engaging portion (first engaging means), 87 First fitting portion (first fitting means), 88 Frame member (first document supporting means), 89 Claw portion (first Document supporting means, pressing means), 93 boss (first engaging portion), 94 boss (first fitting portion), 95 boss (second fitting portion), 96 boss (second engaging portion) Part)

Claims (3)

A first original window formed as a rectangular opening; a frame member fitted to the first original window while holding the original; and an inner peripheral wall associated with one side of the first original window A document holder having a pressing means that protrudes from and presses and positions the frame member against the inner peripheral wall of the opposite side of the one side ;
A transparent rectangular manuscript table provided on the upper wall portion of the housing, on which the manuscript holder is placed;
Positioning means provided on the upper wall for positioning the document holder on the document table, comprising a fitting portion provided in the vicinity of one side of the document table and an engagement portion provided in the vicinity of the one side. Positioning means having an engaging portion provided at a predetermined distance from the fitting portion along the one side;
An image sensor that photoelectrically converts an optical image of a document supported on the document holder placed on the document table and outputs an electrical signal;
Sub-scanning means for transporting the image sensor in the sub-scanning direction;
The image reading apparatus is characterized in that the document holder includes first fitting means for fitting into the fitting portion and first engaging means for engaging with the engaging portion. The image reading apparatus according to claim 1, wherein the pressing unit is provided corresponding to a first side and a second side orthogonal to each other in the first document window. The pressing means protrudes from the inner peripheral wall of the one side, has a shape extending in a direction intersecting with the protruding direction, and has a contact portion that slightly protrudes toward the opposite side. The image reading apparatus according to claim 1, wherein the image reading apparatus is a member having high elasticity.

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