Image reading device

Abstract

To solve a problem where a lens array cannot be set at an appropriate position.SOLUTION: An image reading device comprises: a conveyance part that conveys a medium along a conveyance path; a sensor unit that is arranged onto the conveyance path, and reads an image of the medium to be conveyed; and a depression part that depresses the sensor unit toward the conveyance path facing the sensor unit. The sensor unit includes: a long lens array; a base frame that supports the lens array; and a cover part that is engaged with the base frame, and covers the lens array. The depression part is contacted to the cover part, and is depressed toward the conveyance path from the contact part contacted to the cover part. In a depression direction where the depression part depresses the cover part, the base frame and the cover part are separated.SELECTED DRAWING: Figure 3

Description

Technical Field

[0001] The present invention 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 droop 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 toward the conveyance path, there is a risk that the lens array may be bent by the pressing and the lens array may not be positioned appropriately.

Means for Solving the Problems

[0005] The image reading device includes a conveyance unit that conveys a medium along a conveyance path, a sensor unit that is disposed on the conveyance path and reads an image of the conveyed medium, and a pressing unit that presses the sensor unit toward the conveyance path facing the sensor unit. The sensor unit has a long lens array, a base frame that supports the lens array, and a cover portion that engages with the base frame and covers the lens array. The pressing unit abuts against the cover portion and presses from the abutting portion against the cover portion toward the conveyance path. In a pressing direction in which the pressing unit presses the cover portion, the base frame and the cover portion are separated from each other.

Brief Description of the Drawings

[0006]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Embodiments for Carrying Out the Invention

[0007] The configuration of the image reading device 2 will be described below. In the present embodiment, the configuration of the multifunction device 1 including the image reading device 2 will be described with reference to the drawings as an example. 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 backward 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 left direction, the left side, or simply left, and the negative direction is referred to as the right direction, the right side, or simply right for explanation. Note that the image reading device 2 can be applied independently, rather than as the multifunction device 1.

[0008] 1. Configuration of the Image Reading Device As shown in FIG. 1, the multifunction device 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 device 1 is also referred to as an image forming device. The multifunction device 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, and the like. The image recording device 3 includes a medium storage unit 31 in which the medium M is stored, a medium conveyance unit (not shown) that conveys the medium M from the medium storage unit 31 and records an image with an inkjet head or the like, 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 device 2 includes a medium placement unit 22, a medium discharge unit 23, and an upper unit 21 on which they are mounted. The upper unit 21 can be opened and closed with respect to a document table 27 described later. As shown in FIG. 2, the upper unit 21 of the image reading device 2 further includes a conveyance unit 24 including a conveyance path 26 of the 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 device 2 is also referred to as a document. The conveyance path 26 is configured to include a bent path 320 that communicates from the upper right medium placement unit 22 to the lower right medium discharge unit 23. Hereinafter, in the conveyance direction of the medium M in the conveyance 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 conveyance direction.

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

[0011] On the conveyance path 26, a second sensor unit 4a is arranged upstream, and a first sensor unit 4 is arranged downstream. The first sensor unit 4 reads an image of the first surface of the medium M conveyed in the conveyance path 26 from above. The first elastic member 51, which is a pressing part, 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, the first elastic member 51 can set a predetermined distance between the first sensor unit 4 and the medium M conveyed through the conveyance path 26. Further, the first elastic member 51 can position the first sensor unit 4 and the CISM40 (to be described later) mounted on the first sensor unit 4 and the lens array 43 (to be described later) 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 from below. 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 through the conveyance path 26 from below via the platen 27. 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, the second elastic member 51a can set a predetermined distance between the second sensor unit 4a and the medium M. Further, the second sensor unit 4a can be moved in the left - right direction along the platen 27 by a moving unit (not shown). 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 the placed medium M via the platen 27 while moving by the moving unit.

[0014] The second sensor unit 4a and the second elastic member 51a can have the same configuration as the first sensor unit 4 and the first elastic member 51 described above, except that the platen 27 replaces the guide 28 (to be described later). Hereinafter, the first sensor unit 4 and the first elastic member 51 will be described, and the description of the second sensor unit 4a and the second elastic member 51a will be omitted. Further, hereinafter, the first sensor unit 4 and the first elastic member 51 will be simply referred to as the sensor unit 4 and the elastic member 51.

[0015] 2. Configuration of the Sensor Unit Referring to FIGS. 3 to 8, the configuration of the sensor unit 4 will be described. As shown in FIG. 3, the sensor unit 4 is configured such that a CISM (Contact Image Sensor Module) 40 is supported by a frame 6 which is a base frame and covered by a cover 5 which is a cover portion. As shown in FIG. 4, the CISM 40 is fixed to the frame 6 by a plurality of hooks 63. The configuration of the CISM 40 will be described later with reference to FIG. 7. The CISM 40 includes a substrate 41, an LED array 42, and a lens array 43. The cover 5 can also cover these. The sensor unit 4, and the CISM 40, the cover 5, and the frame 6 included in the sensor unit 4 are also configured to be long. Hereinafter, the rear end in the front-rear direction which is the extending direction of these is also referred to as the rear end, and the front end in the front-rear direction is also referred to as the front end.

[0016] As shown in FIG. 3, a first engaging claw 64a at the rear end of the frame 6 and a second engaging claw 64b at the front end of the frame 6 are respectively engaged with a first engaging hole 55a and a second engaging hole 55b of the cover 5. The combination of these engaging claws and engaging holes is called a so-called snap fit. By the snap fit, the cover 5 is engaged with the frame 6 from the front and rear ends. The snap fit facilitates the assembly of the sensor unit 4. The position at the rear end where the first engaging claw 64a of the frame 6 is engaged with the first engaging hole 55a of the cover 5 is defined as a first position A. The position at the front end where the second engaging claw 64b of the frame 6 is engaged with the second engaging hole 55b of the cover 5 is defined as a second position B.

[0017] The first position A and the second position B are also positions for positioning the cover 5 on the frame 6. The first position A and the second position B where the snap fit is engaged are located above the ends of the cover 5. By configuring a snap fit on the upper side of the cover 5, for example, the first engaging claw 64a of the rear end frame 6 can be formed longer in the vertical direction, and the first engaging hole 55a of the cover 5 can also be formed longer in the vertical direction. By forming the first engaging claw 64a and the first engaging hole 55a longer, the strength of the engagement can be increased and breakage can be suppressed. The same applies to the second engaging claw 64b of the front end frame 6 and the second engaging hole 55b of the cover 5.

[0018] There are two elastic members 51 (not shown in FIGS. 3 to 7), and each can push the cover 5 from above with a pressing force P. Hereinafter, unless otherwise distinguished, the two elastic members and their respective pressing forces P are collectively referred to simply as the elastic member 51 and the pressing force P. The direction in which the pressing force P acts is the pressing direction, and in this example, the pressing direction is downward. That is, the pressing direction is the direction in which the elastic member 51 pushes the cover 5. The elastic member 51 is, for example, a compression coil spring. The elastic member 51 may be other types of springs or rubbers. In FIGS. 3 to 8, for the sake of convenience, the pressing direction of the elastic member 51 is taken as the downward direction of the Z axis, and the configuration such as the sensor unit 4 will be shown.

[0019] On the upper surface of the cover 5, there are provided a first receiving portion 52a located at the rear and a second receiving portion 52b located at the front. The first receiving portion 52a and the second receiving portion 52b are recessed in a circular shape so as to receive the elastic member 51 at a predetermined position. The positions where the first receiving portion 52a and the second receiving portion 52b receive the pressing force P of the elastic member 51 are defined as the fifth position E and the sixth position F, respectively. The pressing force P of each elastic member 51 applied to the cover 5 from above is transmitted from the first receiving portion 52a at the fifth position E and the second receiving portion 52b at the sixth position F, which are located at the front and rear of the cover 5, to the first position A and the second position B configured by the above-mentioned snap fit.

[0020] On the upper surface of the frame 6, a first frame end 61a is formed at the rear end and a second frame end 61b is formed at the front end. On the other hand, on the cover 5, a first cover end 53a extending downward from the rear end and a second cover end 53b extending downward from the front end are formed. The first frame end 61a, the second frame end 61b, the first cover end 53a, and the second cover end 53b may be configured, for example, in a trapezoidal shape or a protruding shape such that the contacting portions protrude.

[0021] At the rear end, the cover 5 and the frame 6 are in contact with each other at the first cover end 53a and the first frame end 61a, and at the front end, they are in contact with each other at the second cover end 53b and the second frame end 61b. In the cover 5 and the frame 6, let the contact position at the rear end be the third position C and the contact position at the front end be the fourth position D. The third position C and the fourth position D are also the positions for positioning the cover 5 on the frame 6. In this way, at the upper fifth position E and sixth position F and the lower third position C and fourth position D, the frame 6 can fix the cover 5. The pressing force P of the elastic member 51 is transmitted from the fifth position E and sixth position F in the cover 5 to the first position A and second position B, and is transmitted from the third position C and fourth position D to the frame 6.

[0022] By the way, as shown in FIGS. 3 and 6, the conveyance path 26 of the medium M is constituted by the upper frame 6 and the lower guide 28. At the front and rear ends of the guide 28, a first guide end 28a and a second guide end 28b extending upward are formed. The front-rear direction of the conveyance path 26, which is the width direction of the medium M, is defined by the first guide end 28a and the second guide end 28b of the guide. The first guide end 28a at the rear end and the second guide end 28b at the front end of the guide 28 respectively support the frame 6 from below and can also receive the pressing force P of the elastic member 51. Note that, as will be described later, a cover glass 65 is provided below the frame 6.

[0023] In this way, at the rear end of the sensor unit 4, the first position A and the third position C are in a vertical positional relationship. And below the third position C, the first guide end 28a is located. That is, from top to bottom, the first position A, the third position C, and the first guide end 28a are located. On the other hand, at the front end of the sensor unit 4, the second position B and the fourth position D are in a vertical positional relationship. And below the fourth position D, the second guide end 28b is located. That is, from top to bottom, the second position B, the fourth position D, and the second guide end 28b are located.

[0024] The pressing force P of the elastic member 51 is transmitted from the fifth position E of the cover 5 at the rear of the sensor unit 4 to the frame 6 via the first position A and the third position C which are in the vertical positional relationship as described above. And the pressing force P is received by the first guide end 28a located below the third position C. On the other hand, the pressing force P of the elastic member 51 is transmitted from the sixth position F of the cover 5 at the front of the sensor unit 4 to the frame 6 via the second position B and the fourth position D which are in the vertical positional relationship as described above. And the pressing force P is received by the second guide end 28b located below the fourth position D. That is, the two elastic members 51 abut against the cover 5 and push from the fifth position E and the sixth position F which are the abutting portions abutting against the cover 5 respectively toward the conveying path 26.

[0025] Referring to FIG. 5, the second position B, the fourth position D, and the sixth position F in front of the cover 5 and the frame 6 will be described in detail. As described above, the pressing force P of the elastic member 51 is transmitted to the second receiving portion 52b which is the sixth position F. At the front end of the cover 5, the second engaging claw 64b of the frame 6 engages with the second engaging hole 54b of the cover 5 and is fixed as a snap fit to be the second position B.

[0026] The position where the second cover end 53b below the front end of the cover 5 abuts against the second frame end 61b above the front end of the frame 6 is defined as the fourth position D. In the example of FIG. 5, the second cover end 53b abuts against the second frame end 61b at two locations in the left-right direction. The second position B and the fourth position D are in an up-down positional relationship. The pressing force P of the elastic member 51 is transmitted in the order of the sixth position F which is slightly closer to the center from the front end of the cover 5, the second position B which is the front end of the cover 5 and the frame 6, and the fourth position D below the second position B.

[0027] As shown in FIG. 5, the cover 5 has a cover side 56 that extends back and forth downward, and the frame 6 has a frame side 62 that extends back and forth upward. The cover side 56 and the frame side 62 are in a positional relationship facing each other. The cover side 56 and the frame side 62 are configured such that there is a gap of distance H1 and they are separated in the up-down direction. The cover side 56 and the frame side 62 will not come into contact. That is, in the pressing direction of the pressing force P, the frame 6 and the cover 5 will be separated.

[0028] As a result, as shown in FIG. 6, the cover 5 is spanned between the first frame end 61a and the second frame end 61b of the frame 6 by the first cover end 53a and the second cover end 53b. In other words, the cover 5 is spanned between the third position C and the fourth position D. That is, the cover 5 and the frame 6 do not come into contact below except at the third position C at the rear end and the fourth position D at the front.

[0029] Also, the cover 5 and the frame 6 do not come into contact above except at the first position A at the rear end and the second position B at the front, which are the positions engaged by the snap fit. As a result, the pressing force P of the elastic member 51 is transmitted from above downward from the first position A to the third position C at the rear end with respect to the cover 5 and the frame 6, and is not transmitted otherwise. Further, the pressing force P of the elastic member 51 is transmitted from above downward from the second position B to the fourth position D at the front end with respect to the cover 5 and the frame 6, and is not transmitted otherwise.

[0030] With such a configuration, the pressing force P of the elastic member 51 is not applied to other than the front and rear ends of the frame 6. The frame 6 is suppressed from bending in the front-rear direction, which is the stretching direction, by the pressing force P of the elastic member 51. Similarly, the CISM40 mounted on the frame 6 is also suppressed from bending in the front-rear direction by the pressing force P. By the way, the cover 5 may be deformed by the pressing force P, temperature change, etc. Also in this case, the force due to the deformation of the cover 5 is transmitted to the frame 6 through the same path as the pressing force P of the elastic member 51. Therefore, the frame 6 and the CISM40 mounted on the frame 6 are also suppressed from bending in the front-rear direction by the force due to the deformation of the cover 5.

[0031] Further, the gap of the distance H1 shown in FIG. 5 can absorb the amount of deformation when the cover 5 is deformed, and the direct pressing load from the cover 5 to the frame 6 is suppressed. That is, even if the cover 5 is deformed, the cover side 56 and the frame side 62 do not come into contact with each other due to the gap of the distance H1. Therefore, the bending of the frame 6 is reduced, and as will be described later, the bending of the lens array 43 of the CISM40 supported by the frame 6 can also be reduced. Note that the descriptions of the first position A, the third position C, the fifth position E, etc. at the rear ends of the cover 5 and the frame 6 are the same as those of the front ends of the cover 5 and the frame 6 described above, and thus the descriptions are omitted.

[0032] FIG. 6 shows the positional relationship of the first position A, the second position B, the third position C, the fourth position D, and the fifth position E in the front-rear direction with reference to the rear end of the sensor unit 4. The front-rear direction is also the stretching direction of the sensor unit 4 and the CISM40, the cover 5, and the frame 6 included in the sensor unit 4. Also, as described above, since the first position A and the third position C, and the second position B and the fourth position D are in an up-and-down positional relationship, they are in the same position in the front-rear direction.

[0033] The distance LA between the first position A and the third position C to the second position B and the fourth position D is also the length of the sensor unit 4, and the CISM40, cover 5, and frame 6 included in the sensor unit 4. The distance LB, which is half of the distance LA, is also half of these lengths. Also, the position of the distance LB is the central position between the first position A and the second position B, and is also the central position between the third position C and the fourth position D. The distance LC from the first position A and the third position C to the fifth position E is shorter than the distance LB.

[0034] Note that, with reference to the front end of the sensor unit 4, the positional relationship of the first position A, second position B, third position C, fourth position D, and fifth position E in the front-rear direction is also the same as described above. That is, the distance between the first position A and the third position C to the second position B and the fourth position D is the distance LA. The position of the distance LB is the central position between the first position A and the second position B, and is also the central position between the third position C and the fourth position D. The distance LC from the second position B and the fourth position D to the sixth position F is shorter than the distance LB.

[0035] Figure 7 is a perspective view of a cross-section taken along the line I-I in Figure 6. As shown in Figure 7, the sensor unit 4 is composed of a CISM40, a cover 5, and a frame 6. The CISM40 includes a substrate 41 on which a plurality of sensors as photoelectric conversion elements are mounted, an LED array 42 having a plurality of LEDs as light sources, and a lens array 43 having a plurality of lenses as condensing bodies. These are configured in a long shape and extend in the front-rear direction. That is, the sensor unit 4 has a long lens array 43, a frame 6 that supports the lens array 43, and a cover 5 that engages with the frame 6 and covers the lens array 43.

[0036] The frame 6 is provided with a cover glass 65 below. As described above, the upper part of the conveyance path 26 is constituted by the frame 6, and a part thereof is constituted by the cover glass 65 provided on the frame 6. The medium M conveyed through the conveyance path 26 can be read by the sensor unit 4 from above through the cover glass 65 provided on the frame 6.

[0037] The configuration in which the CISM40 of the sensor unit 4 reads the image of the medium M will be described. Light is irradiated from the LED array 42 of the CISM40 onto the medium M (not shown in FIG. 7) conveyed under the cover glass 65 of the frame 6. The light irradiated from the LED array 42 is reflected by the medium M through the cover glass 65. The light reflected from the medium M is imaged on the sensor of the substrate 41 through the lens array 43, converted into an electrical signal, and acquired as image information.

[0038] As described above, the pressing force P of the elastic member 51 is transmitted through the sixth position F, the second position B, and the fourth position D in the cover 5 and the frame 6. The pressing force P acts to push the sensor unit 4 fixed to the frame 6 through the cover 5 toward the conveyance path 26 side, and the sensor unit 4 can be placed at a predetermined position. The elastic member 51 can set a predetermined distance between the first sensor unit 4 and the medium M conveyed through the conveyance path 26.

[0039] That is, the elastic member 51 can place the lens array 43 mounted on the first sensor unit 4 at an appropriate position. A predetermined distance can also be set between the lens array 43 mounted on the sensor unit 4 and the medium M in the conveyance path 26, the medium M can be focused, and the image of the medium M can be correctly imaged on the sensor of the substrate 41.

[0040] If the position of the lens array 43 of the sensor unit 4 changes, the focus may shift and the image of the medium M may not be correctly imaged on the sensor of the substrate 41. With the above configuration, the pressing force P of the elastic member 51 is not applied except at the front and rear ends of the frame 6. The pressing force P is not directly applied to the CISM40 attached to the frame 6 and the lens array 43 mounted on the CISM40. Also, the force when the cover 5 is deformed due to the pressing force P or temperature change or the like is transmitted through the same path as the pressing force P of the elastic member 51.

[0041] In this way, the frame 6 is suppressed from bending in the front - rear direction due to the deformation force of the cover 5, the pressing force P of the elastic member 51, etc. The CISM40 attached to the frame 6 and the lens array 43 mounted on the CISM40 are similarly suppressed from bending. As a result, the change in the position of the lens array 43 of the sensor unit 4 can be suppressed, and it can be set at an appropriate position. The lens array 43 can focus on the medium M, and the image of the medium M can be correctly imaged on the sensor of the substrate 41.

[0042] As shown in FIG. 7, the substrate 41 is disposed above the lens array 43 of the CISM40, and the vertical gap between the cover - facing surface 57 of the cover 5 and the substrate - facing surface 41a of the substrate 41 is the distance H2. In other words, in the vertical direction, with the position of the cover glass 65 as a reference, the distance from the cover glass 65 to the cover - facing surface 57 is longer than the distance from the cover glass 65 to the substrate - facing surface 41a. Thus, the substrate 41 and the cover 5 do not contact each other. Due to the distance H2, the substrate 41 does not directly receive the pressing force P of the elastic member 51 from the cover 5, and damage to the substrate 41 due to the pressing force P can be suppressed.

[0043] With the above configuration, as shown in FIG. 8, even when the deformation force of the cover 5 and the pressing force P of the elastic member 51 are applied, the lens array 43 can be within the range of the warping deflection distance S with respect to the above - mentioned distance LA which is the length of the lens array 43. Note that the lens array 43 bends in a downward - convex curved shape. The deflection ratio, which is the ratio of the deflection distance S of the lens array 43 to the distance LA that is the length of the lens array 43, is calculated by S / LA, which is the value obtained by dividing the deflection distance S by the distance LA that is the length of the lens array 43. The deflection ratio of the lens array 43 can be, for example, 0.1% or less. Similarly, the deflection ratio of the CISM 40 can also be suppressed and can be, for example, 0.1% or less.

[0044] According to the above-described embodiment, the image reading apparatus 2 includes a conveyance unit 24 that conveys the medium M along the conveyance path 26, a sensor unit 4 that is disposed on the conveyance path 26 and reads an image of the conveyed medium M, and an elastic member 51 that is a pressing unit that presses the sensor unit 4 toward the conveyance path 26 facing the sensor unit 4. The sensor unit 4 includes a long lens array 43, a frame 6 that is a base frame that supports the lens array 43, and a cover 5 that is a cover portion that engages with the frame 6 and covers the lens array 43. The elastic member 51 abuts against the cover 5 and presses toward the conveyance path 26 from a fifth position E and a sixth position F that are abutting portions that abut against the cover 5. In the pressing direction in which the elastic member 51 presses the cover 5, the frame 6 and the cover 5 are separated by a distance H1.

[0045] With the above-described configuration, even when there are forces such as the deformation force of the cover 5 and the pressing force P of the elastic member 51, the bending of the frame 6 is suppressed, and the CISM 40 fixed to the frame 6 and the lens array 43 mounted on the CISM 40 are also suppressed from bending. That is, the position change of the lens array 43 is suppressed, and the focus shift is suppressed. The position of the lens array 43 can be set to an appropriate position. As a result, in the sensor unit 4, the image of the medium M can be correctly imaged on the sensor of the substrate 41 by the lens array 43. The image reading apparatus 2 can correctly read the image of the medium M.

[0046] As described above, the embodiments have been described in detail with reference to the drawings. However, the specific configuration is not limited to the embodiments, and may be changed, replaced, deleted, etc., as long as the gist of the present invention is not deviated from. For example, a multifunction device 1 to which the above-described image reading device 2 is applied may be used. Further, there may be one elastic member 51, and in the front-rear direction, it may be arranged to push the cover 5 from the position of the distance LB shown in FIG. 6.

Explanation of Reference Numerals

[0047] 1... Multifunction device, 2... Image reading device, 3... Image recording device, 4... First sensor unit, 5... Cover, 6... Frame, 24... Conveying unit, 26... Conveying path, 27... Document table, 28... Guide, 40... CISM, 41... Substrate, 41a... Substrate facing surface, 43... Lens array, 51... First elastic member, 52a... First receiving portion, 52b... Second receiving portion, 53a... First cover end, 53b... Second cover end, 55a... First engaging hole, 55b... Second engaging hole, 56... Cover side, 57... Cover facing surface, 61a... First frame end, 61b... Second frame end, 62... Frame side, 63... Hook, 64a... First engaging claw, 64b... Second engaging claw, 65... Cover glass, A... First position, B... Second position, C... Third position, D... Fourth position, E... Fifth position, F... Sixth position, H1, H2, LA, LB, LC, S... Distances, M... Medium, P... Pushing force.

Claims

1. A conveying unit that conveys a medium along a conveying path, A sensor unit that is disposed on the conveying path and reads an image of the medium being conveyed, A pressing unit that presses the sensor unit toward the conveying path from a contact portion that contacts the cover portion, and is provided with: The sensor unit includes: A long lens array, A base frame that supports the lens array, An engaging portion that engages with the base frame and a cover portion that covers the lens array; The pressing unit contacts the cover portion and presses from the contact portion that contacts the cover portion toward the conveying path, An image reading apparatus, characterized in that the base frame and the cover portion are separated from each other in a pressing direction in which the pressing unit presses the cover portion.

2. The image reading apparatus according to claim 1, A substrate is disposed above the lens array, An image reading apparatus having a gap between the substrate and the cover portion.

3. The image reading apparatus according to claim 1, The base frame and the cover portion are engaged by a snap fit. An image reading apparatus.

4. The image reading apparatus according to claim 3, The location where the snap fit is engaged is above the end of the cover portion. An image reading apparatus.

5. The image reading apparatus according to claim 1, The ratio of the warp to the length of the lens array is 0.1% or less. An image reading apparatus.

Images