Image reading device

Abstract

To solve the problem in which: pressing bends a lens array, and the lens array may not be located at an appropriate position.SOLUTION: An image reading device comprises: a mounting part; a reading unit including a second sensor unit 4a that reads an image of a medium; a carriage 7 that supports the reading unit movably along a movement axis; a rail 123 that supports the carriage 7; and a pressing support part that is arranged between the reading unit and the carriage 7 and presses the reading unit toward the mounting part. The reading unit has a long lens array, a base frame that supports the lens array, and a cover part that covers the base frame. The pressing support part is in contact with the cover part, and presses the cover part from a contact part where it is in contact with the cover part in a pressing application direction toward the mounting part. The base frame and the cover part are separated from each other in the pressing application direction.SELECTED DRAWING: Figure 4

Description

Technical Field

[0001] The present disclosure relates to an image reading device.

Background Art

[0002] Conventionally, as shown in Patent Document 1, there is known an image recording device that uses a rigid material such as aluminum for a frame of a long image sensor unit so that the frame does not sag due to its own weight and the focus between the lens array and the medium is not shifted.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, for example, in a configuration in which the image sensor unit of the image recording device of Patent Document 1 is pressed, the lens array may be bent by the pressing, and there is a risk that the lens array cannot be positioned appropriately.

Means for Solving the Problems

[0005] The image reading device of the present disclosure includes a placement unit having translucency on which a medium can be placed, a reading unit that reads an image of the medium placed on the placement unit via the placement unit, a carriage that movably supports the reading unit along a moving axis, a rail that is arranged along the moving axis and supports the carriage, and a pressing support unit that is arranged between the reading unit and the carriage and presses the reading unit toward the placement unit. The reading unit includes a long lens array, a base frame that supports the lens array, and a cover portion that covers the base frame. The pressing support unit contacts the cover portion and presses the cover portion in a pressing direction toward the placement unit from a contact portion that contacts the cover portion. In the pressing direction, the base frame and the cover portion are separated from each other.

Brief Description of the Drawings

[0006]

Figure 1

Figure 2

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Figure 4

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Figure 11

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Figure 17

Embodiments for Carrying Out the Invention

[0007] Hereinafter, the configuration of the image reading device 2 will be described. In this embodiment, taking the configuration of the multifunction machine 1 equipped with the image reading device 2 as an example, the description will be made with reference to the drawings. The directions in the drawings will be described using a three-dimensional coordinate system. For convenience of explanation, the positive direction of the Z-axis is referred to as the upward direction, the upper direction, or simply up, the negative direction is referred to as the downward direction, the lower direction, or simply down, the positive direction of the X-axis is referred to as the rearward direction, the rear direction, or simply rear, the negative direction is referred to as the forward direction, the front direction, or simply front, the positive direction of the Y-axis is referred to as the leftward direction, the left direction, or simply left, and the negative direction is referred to as the rightward direction, the right direction, or simply right for the description. Note that the image reading device 2 can be applied independently, not as the multifunction machine 1.

[0008] 1. Configuration of the Image Reading Device 2 As shown in FIG. 1, the multifunction machine 1 includes an image reading device 2 disposed on the upper side and an image recording device 3 disposed on the lower side. The multifunction machine 1 is also referred to as an image forming device. The multifunction machine 1 has an input / output unit 11. The input / output unit 11 outputs the menus of the image reading device 2 and the image recording device 3, and inputs the operations of the user related to the image reading device 2 and the image recording device 3. The input / output unit 11 is composed of, for example, a touch panel display, buttons, etc. The image recording device 3 includes a medium storage unit 31 in which the medium M is stored, a medium conveyance unit that conveys the medium M from the medium storage unit 31 and records an image with an inkjet head or the like (not shown), and a recording medium discharge unit 32 that discharges the medium M on which the image is recorded.

[0009] As shown in FIG. 1, the image reading apparatus 2 includes a medium placement unit 22, a medium discharge unit 23, an upper unit 21 on which they are mounted, and a lower unit 121 disposed below the upper unit 21. The upper unit 21 is openable and closable with respect to a document table 27 described later. As shown in FIG. 2, the upper unit 21 of the image reading apparatus 2 further includes a transport unit 24 including a transport path 26 of a medium M shown by a broken line and a feeding unit 25, a first sensor unit 4, and a first elastic member 51. Note that the medium M read by the image reading apparatus 2 is also referred to as a document. The transport path 26 is configured to include a bent bent path 320 that communicates from the upper right medium placement unit 22 to the lower right medium discharge unit 23. Hereinafter, in the transport direction of the medium M in the transport path 26, the side of the medium placement unit 22 is referred to as the upstream, and the side of the medium discharge unit 23 is referred to as the downstream. The placement detection unit 110 detects the medium M placed on the medium placement unit 22. The size detection unit 111 detects the size of the medium M placed on the medium placement unit 22. The regulation unit 50 regulates the feeding of the medium M placed on the medium placement unit 22 in the transport direction.

[0010] The feeding unit 25 is configured to include a retard roller 37 and the like. The feeding unit 25 can separate and feed out the media M one by one from a plurality of media M stacked on the media placement unit 22. The transport unit 24 includes a plurality of rollers such as rollers 81c, 82c, 83c, 84c disposed inside the transport path 26, and rollers 84a, 84b that constitute a roller pair 84. The transport unit 24 transports the medium M sent out from the feeding unit 25 in the transport direction along the transport path 26.

[0011] On the transport path 26, a second sensor unit 4a is disposed upstream and a first sensor unit 4 is disposed downstream. The first sensor unit 4 reads an image of the first surface of the medium M conveyed along the conveyance path 26 from above. The first elastic member 51, which is a pressing portion, presses the first sensor unit 4 toward the conveyance path 26 facing the first sensor unit 4. Hereinafter, pressing is also referred to as pushing. That is, the first elastic member 51 acts to push the first sensor unit 4 toward the conveyance path 26 side, and can hold the first sensor unit 4 at a predetermined position.

[0012] As a result, a predetermined distance can be set between the first sensor unit 4 and the medium M conveyed along the conveyance path 26 by the first elastic member 51. Further, the first elastic member 51 can position the first sensor unit 4, the CISM40 mounted on the first sensor unit 4, and the lens array 43 mounted on the CISM40 at appropriate positions. Upstream of the conveyance path 26 of the first sensor unit 4, the second surface, which is the opposite surface of the first surface of the medium M, is guided by the platen 27, which is a placement portion, from below. The platen 27 can support the medium M. The platen 27 has translucency. The platen 27 is made of, for example, glass that can transmit light.

[0013] The second sensor unit 4a can read an image of the second surface of the medium M conveyed along the conveyance path 26 from below through the platen 27. The second sensor unit 4a has a CISM40 that mounts a lens array 43, similar to the first sensor unit 4. The CISM40 mounted on the second sensor unit 4a has the same configuration as the CISM40 mounted on the first sensor unit 4. The second elastic member 51a acts to push the second sensor unit 4a toward the platen 27 side. Similar to the case of the first sensor unit 4 described above, a predetermined distance can be set between the second sensor unit 4a and the medium M by the second elastic member 51a. The second sensor unit 4a and the second elastic member 51a are arranged in the lower unit 121. Further, the second sensor unit 4a can be moved in the left - right direction along the platen 27 by a moving unit 125, which will be described later. The user opens the upper unit 21 and places the medium M on the platen 27. The upper unit 21 presses the medium M placed on the platen 27 from above. The second sensor unit 4a can also read an image of the placed medium M through the platen 27 while moving by the moving unit 125, which will be described later. The second sensor unit 4a corresponds to an example of a reading unit.

[0014] The first sensor unit 4 and the first elastic member 51 have the same functions as the second sensor unit 4a and the second elastic member 51a. Hereinafter, the second sensor unit 4a and the second elastic member 51a will be described, and the description of the first sensor unit 4 and the first elastic member 51 will be omitted.

[0015] 2. Configuration of the lower unit 121 FIG. 3 shows a schematic configuration of the lower unit 121. FIG. 3 shows a perspective view of the vicinity of the +Y - direction end of the lower unit 121. In the lower unit 121, a second sensor unit 4a, a carriage 7, a rail 123, and a moving unit 125 are arranged.

[0016] The second sensor unit 4a is arranged along the X - axis. The second sensor unit 4a is mounted on the carriage 7. The second sensor unit 4a faces the platen 27 arranged at a position in the +Z - direction.

[0017] The carriage 7 supports the second sensor unit 4a movably. The carriage 7 moves along the rail 123 by the driving force of the moving unit 125. By moving along the rail 123, the carriage 7 moves the second sensor unit 4a along the rail 123.

[0018] The rail 123 is arranged along the Y-axis which is a moving axis. The rail 123 supports the carriage 7. The carriage 7 moves in the +Y direction or the -Y direction along the Y-axis. When the carriage 7 moves along the Y-axis, the second sensor unit 4a reads the medium M placed on the platen 27.

[0019] The moving part 125 moves the carriage 7. The moving part 125 is arranged at the +Y direction end position of the lower unit 121. The moving part 125 has a moving part drive source 125a and a moving part drive transmission mechanism 125b.

[0020] The moving part drive source 125a generates a driving force to move the carriage 7. The moving part drive source 125a is constituted by a motor as an example. The moving part drive source 125a generates a rotational force as the driving force.

[0021] The moving part drive transmission mechanism 125b transmits the driving force generated by the moving part drive source 125a to the carriage 7. The moving part drive transmission mechanism 125b is constituted by gears, rollers, etc. As an example, the moving part drive transmission mechanism 125b transmits the driving force generated by the moving part drive source 125a to a belt that connects to the carriage 7. The belt rotates by the driving force. When the belt rotates, the carriage 7 moves in the +Y direction or the -Y direction along the rail 123.

[0022] Figure 4 shows the cross-sectional configuration of the lower unit 121. Figure 4 shows the A-A cross-section in Figure 3. Figure 4 shows the cross-sectional configuration of a part of the lower unit 121 including the second sensor unit 4a and the carriage 7. Figure 4 shows the cross-sectional configuration including the platen 27.

[0023] The second sensor unit 4a has a second sensor cover 5a and a CISM40. Here, CISM is an abbreviation for Contact Image Sensor Module. The configuration of the CISM40 will be described later. The second sensor unit 4a, the CISM40 included in the second sensor unit 4a, and the second sensor cover 5a are configured in an elongated shape along the X-axis.

[0024] The second sensor cover 5a covers the CISM40, a second sensor frame 6a to be described later, and the like. The second sensor cover 5a is supported by the carriage 7 by a support member 150 to be described later. The second sensor cover 5a corresponds to an example of a cover portion. The second sensor cover 5a is provided with a slider 151.

[0025] The slider 151 contacts the -Z direction surface of the platen 27 by the pressing force of the support member 150. When the carriage 7 moves along the Y-axis, the slider 151 slides with respect to the -Z direction surface of the platen 27. The slider 151 is provided at the +X direction end and the -X direction end of the second sensor cover 5a. By the slider 151 contacting the -Z direction surface of the platen 27, the distance between the second sensor unit 4a and the medium M is regulated to a predetermined distance. The slider 151 may be integrally formed with the second sensor cover 5a or may be formed as a separate member from the second sensor cover 5a.

[0026] The carriage 7 has a carriage engaging portion 7a. The carriage engaging portion 7a engages with the rail 123. When the carriage 7 moves along the Y-axis, the carriage engaging portion 7a slides with respect to the rail 123.

[0027] 3. Configuration of the Carriage 7 and the Second Sensor Unit 4a FIG. 5 shows the configuration of the second sensor unit 4a and the carriage 7. FIG. 5 shows the second sensor unit 4a and the carriage 7 in a perspective view. FIG. 5 shows an engaging protrusion 153 and an engaging hook 7b.

[0028] The engaging protrusion 153 is provided on the second sensor cover 5a. The engaging protrusion 153 is provided on the -Y-direction side surface of the second sensor cover 5a. The engaging protrusion 153 protrudes from the -Y-direction side surface of the second sensor cover 5a. The second sensor cover 5a has, as an example, the engaging protrusion 153 at the end position in the -X direction and the engaging protrusion 153 at the end position in the +X direction. The engaging protrusion 153 provided at the end position in the -X direction has a cylindrical portion protruding in the -X direction along the X-axis intersecting the Y-axis. The engaging protrusion 153 provided at the end position in the +X direction has a cylindrical portion protruding in the +X direction along the X-axis intersecting the Y-axis. The engaging protrusion 153 corresponds to an example of the engaged portion. The -X direction and the +X direction correspond to an example of the direction intersecting the moving axis.

[0029] The engaging hook 7b is provided on the -Y-direction side surface of the carriage 7. The engaging hook 7b is configured to be engageable with the engaging protrusion 153 from the -Z direction. The carriage 7 is provided with engaging hooks 7b that engage with each of the two engaging protrusions 153. The engaging hook 7b is configured to be deformable along the Z-axis. Due to the deformation of the engaging hook 7b, the engaging protrusion 153 can be moved along the Z-axis. By deforming the engaging hook 7b, the engaging protrusion 153 is movably engaged in the +Z direction, which is the direction approaching the platen 27, and the -Z direction, which is the direction away from the platen 27. When there are irregularities on the -Z-direction surface of the platen 27, the second sensor unit 4a can move along the irregularities.

[0030] The second sensor cover 5a has an engaging protrusion 153 protruding in the +X direction or the -X direction intersecting the Y-axis. The carriage 7 has an engaging hook 7b that engages with the engaging protrusion 153. The engaging hook 7b corresponds to an example of the engaging portion. The engaging hook 7b movably engages the engaging protrusion 153 in the +Z direction approaching the platen 27 and the -Z direction away from the platen 27. When there are steps, irregularities, etc. on the -Z-direction surface of the platen 27, the second sensor unit 4a can move along the steps and irregularities due to the deformation of the engaging hook 7b.

[0031] 4. Configuration of the second sensor unit 4a FIG. 6 shows a schematic configuration of the second sensor unit 4a. FIG. 6 shows the second sensor unit 4a in a perspective view. The second sensor unit 4a includes a second sensor cover 5a, a second sensor frame 6a, and CISM40.

[0032] The second sensor cover 5a has a slider 151, an engagement protrusion 153, and a pressing member 155.

[0033] The slider 151 has slider protrusions 151a that contact the -Z direction surface of the platen 27. The slider 151 shown in FIG. 6 has two slider protrusions 151a along the Y-axis. The number of slider protrusions 151a is not limited to two. The number of slider protrusions 151a may be one or a plurality. By providing a plurality of slider protrusions 151a along the Y-axis, the inclination of the second sensor unit 4a is reduced.

[0034] The pressing member 155 is attached to the +Z direction surface of the second sensor cover 5a. The pressing member 155 restricts the movement of the second sensor frame 6a disposed within the second sensor cover 5a toward the platen 27. The second sensor frame 6a will be described later. Four pressing members 155 are attached to the second sensor cover 5a shown in FIG. 6. The pressing members 155 are attached to the -X direction end position and the +X direction end position of the second sensor cover 5a.

[0035] The second sensor frame 6a supports the lens array 43 and the like included in CISM40. The configuration of CISM40 will be described later. The second sensor frame 6a is covered by the second sensor cover 5a. The second sensor frame 6a corresponds to an example of a base frame.

[0036] CISM40 includes a lens array 43. The lens array 43 is disposed at a position facing the platen 27. The lens array 43 is supported by the second sensor frame 6a. The lens array 43 is covered by the second sensor cover 5a.

[0037] FIG. 7 shows a cross-sectional configuration of the second sensor unit 4a. FIG. 7 shows a cross-section taken along line B-B in FIG. 6. FIG. 7 shows a second sensor cover 5a, a second sensor frame 6a, a pressing member 155, and a positioning member 157 included in the second sensor unit 4a.

[0038] The positioning member 157 regulates the position of the second sensor frame 6a along the Y-axis. The positioning member 157 is disposed at the -Y direction position of the second sensor frame 6a. The positioning member 157 is disposed at the -Z direction position of the pressing member 155. The second sensor unit 4a shown in FIG. 7 shows two positioning members 157. The two positioning members 157 are disposed at the +X direction end position and the -X direction end position of the second sensor unit 4a. The number of the positioning members 157 is not limited to two. One positioning member 157 may be provided, or a plurality of positioning members 157 may be provided.

[0039] FIG. 8 shows a cross-sectional configuration of the second sensor unit 4a. FIG. 8 shows an enlarged view of the vicinity of the pressing member 155 of the cross-section taken along line B-B in FIG. 6. FIG. 8 shows an enlarged view of the vicinity of the pressing member 155 disposed at the -X direction end position of the second sensor unit 4a.

[0040] The second sensor cover 5a has a frame support portion 159. The frame support portion 159 is provided on the -Z direction surface of the second sensor cover 5a facing the second sensor frame 6a. The frame support portion 159 supports the second sensor frame 6a from below. The frame support portion 159 is disposed below the pressing member 155.

[0041] The second sensor frame 6a is supported by the frame support portion 159. The second sensor frame 6a is supported by the second sensor cover 5a at the position of the frame support portion 159.

[0042] FIG. 8 shows the configuration in the vicinity of the pressing member 155 disposed at the -X direction end position of the second sensor unit 4a. The configuration in the vicinity of the pressing member 155 disposed at the +X direction end position of the second sensor unit 4a is the same as the configuration shown in FIG. 8. The frame support portion 159 is disposed below the pressing member 155 disposed at the +X direction end position of the second sensor unit 4a.

[0043] FIG. 9 shows an enlarged view of a part of the second sensor unit 4a. FIG. 9 shows the vicinity of the pressing member 155 disposed at the -X direction end position of the second sensor unit 4a. FIG. 9 shows an enlarged plan view from the +Z direction.

[0044] The second sensor frame 6a has a protruding portion 161. The protruding portion 161 protrudes in the +Y direction from the +Y direction side surface of the second sensor frame 6a. The +X direction side surface and the -X direction side surface of the protruding portion 161 are configured to be in contact with the second sensor cover 5a. When the +X direction side surface or the -X direction side surface of the protruding portion 161 comes into contact with the second sensor cover 5a, the position of the second sensor frame 6a along the X axis is restricted. The protruding portion 161 restricts the position of the second sensor frame 6a along the X axis.

[0045] FIG. 10 shows the schematic configuration of the second sensor unit 4a. FIG. 10 shows the C-C cross section in FIG. 6. FIG. 10 shows the second sensor cover 5a, the second sensor frame 6a, CISM40, and the pressing member 155 included in the second sensor unit 4a.

[0046] The frame support portion 159 of the second sensor cover 5a is provided on the +Y direction side surface and the -Y direction side surface of the second sensor cover 5a. The frame support portion 159 supports the second sensor frame 6a in the X-Y plane.

[0047] The CISM40 converts the image of the medium M into an electrical signal. The first sensor unit 4 and the second sensor unit 4a read the image of the medium M based on the electrical signal converted by the CISM40. The CISM40 includes a substrate 41, an LED array 42, and a lens array 43.

[0048] The substrate 41 mounts a plurality of sensors as photoelectric conversion elements. The substrate 41 arranges a plurality of sensors along the X-axis. The substrate 41 receives light via the lens array 43 and converts the received light into an electrical signal. The substrate 41 included in the CISM40 of the second sensor unit 4a is covered by the second sensor cover 5a. The substrate 41 included in the CISM40 of the second sensor unit 4a is supported by the second sensor frame 6a.

[0049] The LED array 42 has a plurality of LEDs as light sources. LED is the abbreviation of Light Emitting Diode. The LED array 42 irradiates light toward the medium M. The LED array 42 mounted on the second sensor unit 4a irradiates light toward the medium M placed on the platen 27. The LED array 42 included in the CISM40 of the second sensor unit 4a is covered by the second sensor cover 5a. The LED array 42 included in the CISM40 of the second sensor unit 4a is supported by the second sensor frame 6a.

[0050] The lens array 43 has a plurality of lenses as condensing bodies. The lens array 43 is configured as a rod lens array as an example. The lens array 43 condenses the light emitted by the LED array 42 and reflected by the medium M. The light condensed by the lens array 43 is received by the substrate 41. The lens array 43 included in the CISM40 of the second sensor unit 4a is covered by the second sensor cover 5a. The lens array 43 included in the CISM40 of the second sensor unit 4a is supported by the second sensor frame 6a.

[0051] FIG. 11 shows an enlarged view of a part of the second sensor unit 4a. FIG. 11 shows an enlarged view of the +X direction end of the second sensor unit 4a. FIG. 11 shows a plan view from the +Z direction. FIG. 11 shows a state where the pressing member 155 is removed. FIG. 11 shows the second sensor cover 5a, the second sensor frame 6a, CISM 40, and the positioning member 157 included in the second sensor unit 4a.

[0052] The positioning member 157 is disposed on the first cover side surface 5Sa which is the -Y direction inner side surface of the second sensor cover 5a. The first cover side surface 5Sa is a surface intersecting the Y-axis. The first cover side surface 5Sa shown in FIG. 11 is a surface orthogonal to the Y-axis. The positioning member 157 contacts the frame side surface 6S in the -Y direction of the second sensor frame 6a. The frame side surface 6S is a surface intersecting the Y-axis. The frame side surface 6S shown in FIG. 11 is a surface orthogonal to the Y-axis. The positioning member 157 presses the second sensor frame 6a toward the second cover side surface 5Sb which is the +Y direction inner side surface. The second sensor frame 6a is pressed against the second cover side surface 5Sb. The position of the second sensor frame 6a along the Y-axis is positioned by the second cover side surface 5Sb. The positioning member 157 regulates the position of the second sensor frame 6a along the Y-axis. By regulating the position of the second sensor frame 6a along the Y-axis, the reading position of the second sensor unit 4a along the Y-axis is stabilized.

[0053] It has a positioning member 157 disposed on the first cover side surface 5Sa of the second sensor cover 5a intersecting the Y-axis, and bringing the frame side surface 6S of the second sensor frame 6a intersecting the Y-axis into contact with the second cover side surface 5Sb facing the first cover side surface 5Sa. The positioning member 157 can stabilize the reading position of the second sensor unit 4a along the Y-axis.

[0054] 5. Support structure of the second sensor unit 4a FIG. 12 schematically shows the support configuration of the second sensor unit 4a. FIG. 12 shows the schematic configuration of the second sensor unit 4a and the carriage 7. FIG. 12 shows the X-Z cross section of the second sensor unit 4a and the carriage 7. FIG. 12 shows the support configuration of the second sensor unit 4a by the carriage 7.

[0055] A first support member 150a, which is one of the support members 150, is provided between the second sensor unit 4a and the carriage 7. The first support member 150a supports the second sensor unit 4a on the carriage 7. The first support member 150a supports the second sensor unit 4a so as to be able to press it in the +Z direction. The first support member 150a presses the second sensor unit 4a toward the platen 27. The first support member 150a is composed of an elastic member such as a spring. The first support member 150a corresponds to an example of a pressing support portion.

[0056] The first support member 150a has a first contact surface CS1 that contacts the second sensor cover 5a. The first contact surface CS1 is one of the contact surfaces CS and corresponds to an example of a contact portion. The first support member 150a contacts the second sensor cover 5a at the first contact surface CS1. The first support member 150a presses the second sensor cover 5a in the pressing application direction, which is the direction directly upward from the first contact surface CS1. The pressing force by the first support member 150a is transmitted to the slider 151 of the second sensor cover 5a. Due to the pressing force of the first support member 150a, the slider protrusion 151a of the slider 151 contacts the -Z direction surface of the platen 27.

[0057] FIG. 12 shows the support configuration for supporting the second sensor unit 4a by two support members 150. The two support members 150 are the first support member 150a and the second support member 150b. The first support member 150a has a first contact surface CS1 that contacts the second sensor cover 5a. The second support member 150b has a second contact surface CS2 that contacts the second sensor cover 5a. The second contact surface CS2 is one of the contact surfaces CS and corresponds to an example of a second contact portion.

[0058] The first support member 150a contacts the second sensor cover 5a at the first contact surface CS1. The first support member 150a presses the second sensor cover 5a in a first pressing application direction which is a direction straight up from the first contact surface CS1. The pressing force by the first support member 150a is transmitted to the slider 151 of the second sensor cover 5a.

[0059] The second support member 150b contacts the second sensor cover 5a at the second contact surface CS2. The second support member 150b presses the second sensor cover 5a in a second pressing application direction which is a direction straight up from the second contact surface CS2. The pressing force by the second support member 150b is transmitted to the slider 151 of the second sensor cover 5a. The second support member 150b corresponds to an example of the second pressing support portion.

[0060] The first support member 150a is disposed at a position in the -X direction from a virtual vertical line VL passing through the center along the X-axis of the second sensor unit 4a. The second support member 150b is disposed at a position in the +X direction from the virtual vertical line VL. The distance between the position where the first support member 150a is disposed along the X-axis and the virtual vertical line VL is the same or substantially the same as the distance between the position where the second support member 150b is disposed and the virtual vertical line VL.

[0061] The first support member 150a is disposed closer to the virtual vertical line VL than a frame support portion 159 provided at an end position in the -X direction of the second sensor cover 5a. The second support member 150b is disposed closer to the virtual vertical line VL than a frame support portion 159 provided at an end position in the +X direction of the second sensor cover 5a. The first support member 150a and the second support member 150b are disposed inside along the X-axis from the two frame support portions 159.

[0062] The two frame support portions 159 are arranged outside the two support members 150. The second sensor frame 6a is supported by the frame support portions 159. The lower surface of the second sensor frame 6a is arranged spaced apart from the second sensor cover 5a except at the position where it contacts the frame support portions 159. The second sensor frame 6a is arranged at a separation distance D from the second sensor cover 5a at a position in the direction directly above from the contact surface CS of the support member 150. In the direction directly above from the contact surface CS of the support member 150, the second sensor frame 6a and the second sensor cover 5a are separated. By separating the second sensor frame 6a and the second sensor cover 5a in the direction directly above from the contact surface CS of the support member 150, it is possible to suppress the direct application of the pressing force of the support member 150 to the second sensor frame 6a. The deformation of the second sensor frame 6a due to the pressing force of the support member 150 is suppressed.

[0063] The second sensor frame 6a is arranged at a first separation distance D1 from the second sensor cover 5a at a position in the direction directly above from the first contact surface CS1 of the first support member 150a. In the direction directly above from the first contact surface CS1 of the first support member 150a, the second sensor frame 6a and the second sensor cover 5a are separated.

[0064] The second sensor frame 6a is arranged at a second separation distance D2 from the second sensor cover 5a at a position in the direction directly above from the second contact surface CS2 of the second support member 150b. The second separation distance D2 is equal to or substantially equal to the first separation distance D1. In the direction directly above from the second contact surface CS2 of the second support member 150b, the second sensor frame 6a and the second sensor cover 5a are separated.

[0065] The support member 150 may be one or a plurality. Preferably, the support member 150 is two as an example. By providing the first support member 150a and the second support member 150b as the two support members 150, the deflection due to the own weight of the second sensor cover 5a is suppressed. When the support member 150 is one, the support member 150 is preferably arranged on the virtual vertical line VL.

[0066] The image reading device 2 preferably has a second support member 150b that contacts the second sensor cover 5a at a position different from the first support member 150a and presses the second sensor cover 5a in a second pressing direction applied from a second contact surface CS2 that contacts the second sensor cover 5a toward the platen 27. In the second pressing direction, the second sensor frame 6a and the second sensor cover 5a are separated from each other. By providing the first support member 150a and the second support member 150b, the deflection of the second sensor cover 5a due to its own weight can be suppressed.

[0067] The pressing member 155 is disposed at the +Z direction position of the frame support portion 159. The frame support portion 159 transmits the pressing force applied from the support member 150 to the second sensor frame 6a. The second sensor frame 6a moves or deforms in the +Z direction toward the platen 27 by the pressing force transmitted from the frame support portion 159. The pressing member 155 can suppress the movement and deformation of the second sensor frame 6a toward the platen 27 caused by the pressing force of the support member 150.

[0068] The image reading device 2 preferably has a pressing member 155 that is supported by the second sensor cover 5a and restricts the movement of the second sensor frame 6a toward the platen 27. The pressing member 155 can suppress the movement and deformation of the second sensor frame 6a toward the platen 27 caused by the pressing force of the support member 150.

[0069] FIG. 13 shows a cross section viewed from the -Y direction showing the deflection of the CISM40 and the lens array 43. FIG. 13 schematically shows the deflection of the lens array 43 and the like due to the pressing force of the support member 150.

[0070] When the deformation of the second sensor cover 5a or the pressing force of the support member 150 is applied to the second sensor frame 6a, the lens array 43 is warped by a warping distance S with respect to an array distance LA that is the length along the X axis of the lens array 43. The warp of the lens array 43 is formed in a convex curved shape toward the -Z direction.

[0071] The warpage ratio Wr of the lens array 43, which is the ratio of the deflection distance S to the array distance LA, is the value obtained by dividing the deflection distance S by the array distance LA. The warpage ratio Wr is represented by the following formula (1). Wr = S / LA (1)

[0072] By separating the second sensor frame 6a and the second sensor cover 5a in the direction directly above from the contact surface CS of the support member 150, it is possible to prevent the pressing force of the support member 150 from being directly applied to the second sensor frame 6a. By separating the second sensor frame 6a and the second sensor cover 5a in the direction directly above from the contact surface CS of the support member 150, the warpage ratio Wr can be suppressed within a predetermined range. By providing the pressing member 155, the warpage ratio Wr can be suppressed to 0.1% or less, for example.

[0073] The pressing member 155 can suppress the movement and deformation of the second sensor frame 6a in the +Z direction caused by the pressing force of the support member 150. By providing the pressing member 155, the deflection distance S of the lens array 43 becomes smaller. The warpage ratio Wr of the lens array 43 can be suppressed to an even smaller range.

[0074] The image reading device 2 includes a transparent platen 27 on which a medium M can be placed, a second sensor unit 4a that reads an image of the medium M placed on the platen 27 through the platen 27, a carriage 7 that supports the second sensor unit 4a so as to be movable along the Y-axis, a rail 123 that is arranged along the Y-axis and supports the carriage 7, and a support member 150 that is arranged between the second sensor unit 4a and the carriage 7 and presses the second sensor unit 4a toward the platen 27. The second sensor unit 4a includes a long lens array 43, a second sensor frame 6a that supports the lens array 43, and a second sensor cover 5a that covers the second sensor frame 6a. The support member 150 contacts the second sensor cover 5a and presses the second sensor cover 5a in a pressing direction toward the platen 27 from a contact surface CS that contacts the second sensor cover 5a. In the pressing direction, the second sensor frame 6a and the second sensor cover 5a are separated from each other. By separating the second sensor frame 6a and the second sensor cover 5a in a direction directly upward from the contact surface CS of the support member 150, the warping of the lens array 43 is suppressed. The second sensor unit 4a can maintain the reading accuracy.

[0075] The warping ratio Wr of the lens array 43 is preferably 0.1% or less. When the warping ratio Wr of the lens array 43 is 0.1%, the reading accuracy of the second sensor unit 4a is maintained.

[0076] 6. Configuration of the pressing member 155 FIG. 14 shows a schematic configuration of the pressing member 155. FIG. 14 shows the pressing member 155 in a perspective view. The pressing member 155 includes a pressing portion 155a and two screw holes 155b.

[0077] The pressing part 155a restricts the movement and deformation of the second sensor frame 6a. The pressing part 155a contacts the +Z-direction surface of the second sensor frame 6a. By contacting the +Z-direction surface of the second sensor frame 6a, the pressing part 155a suppresses the movement and deformation of the second sensor frame 6a toward the platen 27.

[0078] A screw is attached to the screw hole 155b. By attaching a screw to the screw hole 155b, the pressing member 155 is attached to the +Z-direction surface of the second sensor cover 5a.

[0079] FIG. 15 shows an enlarged view of a part of the second sensor unit 4a. FIG. 15 shows the end position of the second sensor unit 4a in the +X direction in a perspective view. FIG. 15 shows the attachment state of the pressing member 155.

[0080] The pressing member 155 is attached to the second sensor cover 5a by a screw. When the pressing member 155 is attached to the second sensor cover 5a, the pressing part 155a protrudes to the +Z-direction position of the second sensor frame 6a. The pressing part 155a is disposed at the +Z-direction position of the second sensor frame 6a. The pressing part 155a contacts the second sensor frame 6a and restricts the movement and deformation of the second sensor frame 6a in the +Z direction. By the pressing part 155a contacting the second sensor frame 6a, the pressing member 155 can suppress the movement and deformation of the second sensor frame 6a toward the platen 27.

[0081] 7. Configuration of the positioning member 157 FIG. 16 shows a schematic configuration of the positioning member 157. FIG. 16 shows a plan view from the +Z direction when the positioning member 157 is attached to the second sensor cover 5a. The positioning member 157 includes a frame contact part 157a and an elastic support part 157b. The positioning member 157 is made of an insulating resin. By the positioning member 157 being made of resin, the influence on the substrate 41 due to static electricity can be reduced.

[0082] The frame contact portion 157a contacts the frame side surface 6S of the second sensor frame 6a. The frame contact portion 157a presses the frame side surface 6S toward the second cover side surface 5Sb in the +Y direction.

[0083] The elastic support portion 157b presses the frame contact portion 157a against the frame side surface 6S. The elastic support portion 157b is configured to be elastically deformable. Due to the elasticity of the elastic support portion 157b, the frame contact portion 157a presses the frame side surface 6S.

[0084] FIG. 17 shows a cross-sectional configuration of the second sensor unit 4a. FIG. 17 shows a cross-sectional configuration at a position where the frame contact portion 157a contacts the frame side surface 6S. The positioning member 157 positions the second sensor frame 6a on the second cover side surface 5Sb by pressing the frame side surface 6S.

[0085] The positioning member 157 is preferably provided on the first cover side surface 5Sa and presses against the second cover side surface 5Sb. By providing the positioning member 157 only on the first cover side surface 5Sa, it is possible to suppress the widening of the width of the second sensor unit 4a along the Y axis.

Explanation of Reference Numerals

[0086] 1... Multifunction device, 2... Image reading device, 3... Image recording device, 4... First sensor unit, 4a... Second sensor unit, 5a... Second sensor cover, 5Sa... First cover side surface, 5Sb... Second cover side surface, 6a... Second sensor frame, 6S... Frame side surface, 7... Carriage, 7a... Carriage engagement part, 7b... Engagement hook, 11... Input / output unit, 21... Upper unit, 22... Media placement unit, 23... Media discharge unit, 24... Conveyor unit, 25... Feeding unit, 26... Conveyor path, 27... Document table, 31... Media storage unit, 32... Recorded media discharge unit, 37... Retard roller, 40... CISM, 41... Substrate, 42... LED array, 43... Lens array, 51... First elastic member, 51a... Second elastic member, 81c... Roller, 82c... Roller, 83c... Roller, 84... Roller pair, 84a... Roller, 84b... Roller, 84c... Roller, 110... Placement detection unit, 111... Size detection unit, 121... Lower unit, 123... Rail, 125... Moving part, 125a... Moving part drive source, 125b... Moving part drive transmission mechanism, 150... Support member, 150a... First support member, 150b... Second support member, 151... Slider, 151a... Slider protrusion, 153... Engagement protrusion, 155... Pressing member, 155a... Pressing part, 155b... Screw hole, 157... Positioning member, 157a... Frame contact part, 157b... Elastic support part, 159... Frame support part, 161... Protrusion, 320... Bending path, CS... Contact surface, CS1... First contact surface, CS2... Second contact surface, D... Separation distance, D1... First separation distance, D2... Second separation distance, LA... Array distance, M... Media, S... Deflection distance.

Claims

1. A placement part having translucency on which a medium can be placed, A reading unit that reads an image of the medium placed on the placement part via the placement part, A carriage that movably supports the reading unit along a moving axis, A rail that is arranged along the moving axis and supports the carriage, A pressing support part that is arranged between the reading unit and the carriage and presses the reading unit toward the placement part, and is provided with: The reading unit is A long lens array, A base frame that supports the lens array, And a cover part that covers the base frame, The pressing support part contacts the cover part and presses the cover part in a pressing application direction from the contact part that contacts the cover part toward the placement part, In the pressing application direction, the base frame and the cover part are separated from each other, An image reading apparatus.

2. It has a second pressing support part that contacts the cover part at a position different from the pressing support part and presses the cover part in a second pressing application direction from the second contact part that contacts the cover part toward the placement part, In the second pressing application direction, the base frame and the cover part are separated from each other, The image reading apparatus according to claim 1.

3. It has a pressing member that is supported by the cover part and restricts the movement of the base frame toward the placement part, The image reading apparatus according to claim 1.

4. It has a positioning member that is arranged on a first cover side surface of the cover part that intersects the moving axis and makes a frame side surface of the base frame that intersects the moving axis contact a second cover side surface that faces the first cover side surface, The image reading apparatus according to claim 1.

5. The cover part has an engaged part that protrudes in a direction intersecting the moving axis, The carriage has an engaging part that engages with the engaged part, The engaging part engages with the engaged part so as to be movable in a direction approaching the placement part and a direction away from the placement part, The image reading apparatus according to claim 1.

6. The warpage ratio of the lens array is 0.1% or less, The image reading apparatus according to claim 1.

Images