JP2017011639A - Image reading device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an image reading device that is configured to perform transmission/reception of signals through FFC and enhances the lifetime of FFC with a simple configuration.SOLUTION: An image reading device includes a scan unit that moves in the longitudinal direction of a document, a chassis member, a controller that does not move with movement of the scan unit, and FFC 22 that connects the scan unit and the controller. Further, one end of the FFC 22 is fitted to a portion on the chassis member side of the scan unit, and a position other than one end is set as a fixed position which does not move with the movement of the scan unit, and a range from the fixed position to one end side is parallel to the moving direction of the scan unit, and arranged so as to be bent in an U-shape and reach the fixed position. Further, an elastic sheet member 29 for pressing the FFC 22 against the chassis member is provided, and the elastic sheet member 29 has a site located at the inside of the curvature of the FFC 22 and a site located at the outside of the curvature of the FFC 22.SELECTED DRAWING: Figure 5

Description

  The present invention relates to an image reading apparatus that reads an image of a document and acquires an image signal. More specifically, the present invention relates to an image reading apparatus that reads a statically placed document image by a scanning unit that reads a scan unit that moves in the longitudinal direction of the document.

  As an example of a conventional image reading apparatus of this type, Patent Document 1 can be cited. In the image reading apparatus of Patent Document 1, an image of a document is read by reciprocating a long reading unit in the main scanning direction in the sub scanning direction. Here, the exchange of electrical signals between the reading unit, which is a moving body, and the casing that does not move is performed by a flexible flat cable (hereinafter referred to as “FFC”).

JP 2012-108424 A JP 2004-348074 A

  However, the conventional techniques described above have the following problems. That is, the life of the FFC is short. This is because the FFC is curved and arranged, and the movement of the reading unit reverses the direction of the curvature at a part of the FFC.

  This will be described with reference to FIGS. FIG. 1 is a sectional view of this type of reading unit 100. Although details are omitted in this figure, the direction perpendicular to the paper surface is the longitudinal direction (main scanning direction) of the reading unit 100. A horizontal arrow X direction in the figure is a moving direction of the reading unit 100. Although not shown in the drawing, the document to be read is placed above the reading unit 100 in the drawing with the reading surface facing downward. An FFC 102 is connected to the reading unit 100. The FFC 102 is disposed between the reading unit 100 and the housing 101 in a U-shaped curved state. FIG. 1 shows a situation in which the reading unit 100 is located at the leftmost position of the movement range. In this state, the portion of the range B in the figure of the FFC 102 is curved in a U shape. The FFC 102 in the curved section is curved in a convex direction with respect to the reading unit 100 and the casing 101.

  FIG. 2 shows a cross-sectional view of the reading unit 100 moved to the right with respect to the state shown in FIG. In FIG. 2, the reading unit 100 is displaced to the right as compared with FIG. Accordingly, the FFC 102 is greatly curved in a U shape when it protrudes to the left in the drawing relative to the reading unit 100. Here, when the FFC 102 in FIG. 2 is viewed in detail, it can be seen that the portion of the range C is curved in the direction opposite to that described so far. That is, the FFC 102 in the range C is curved in a concave shape with respect to the reading unit 100. Of course, the FFC 102 in the range C is also curved in a convex shape when the reading unit 100 is located at the left end as shown in FIG. For this reason, the FFC 102 within this range is reversed in the direction of bending due to the movement of the reading unit 100. By repeating this reversal of the curve, the FFC 102 is fatigued and disconnection occurs.

  Further, when the FFC 102 is made of a strong material, the resistance to bending is strong, so that “51” (corresponding to the reading unit 100) is moved as indicated by “54” in FIG. Therefore, the FFC 102 tends to swing greatly. Although this shake can be suppressed by providing “13” (suppressing portion) in FIG. 1 of the same document, when “12” (corresponding to the reading unit 100) is moved to the tip, FIG. It is necessary to elastically deform the holding portion 13 as shown in FIG. Although it appears to be deformed without any problem in the same figure, it may actually buckle and the restraining part 13 may be damaged. Although it can be considered that the holding portion is movable as shown as “32” in FIGS. 4 and 5 of the same document, this complicates the mechanism.

  The present invention has been made to solve the above-described problems of the prior art. That is, an object of the present invention is to provide an image reading apparatus that is configured to exchange signals with a scan unit by FFC and that has a simple structure and has a long FFC life.

  An image reading apparatus according to an aspect of the present invention is an apparatus that reads an image of a document and obtains an image signal, and is provided across the entire width direction of the document so as to face a placement surface on which the document is placed. A scanning unit that irradiates light on the document and receives reflected light from the document while moving in the longitudinal direction of the document, a chassis member that is located on the opposite side of the placement surface across the scan unit, and a scan unit in the chassis member The controller provided at a position that does not move with the movement of the FFC, the FFC that connects the scan unit and the controller, and one end that is attached to the scan unit and elastic that presses the FFC toward the chassis member at a portion other than the one end The FFC has one end attached to a portion of the scan unit on the chassis member side. In both cases, the position other than one end is a fixed position fixed at a position where it does not move with the movement of the scan unit in the chassis member, and the range on one end side of the fixed position is parallel to the movement direction of the scan unit. The elastic sheet member is disposed so as to be bent from the one end toward the one side in the moving direction of the scan unit, curved in a U-shape, enter between the scan unit and the chassis member, and reach a fixed position. And a pressing section corresponding to a section in which the FFC is pressed against the chassis member when the scanning unit is moved to the most side, the inner surface side of the U-shaped curve of the FFC And at least a part of the root section between the tip section and the one end, and the intersection section between the tip section and the pressing section, and F Those located on the outer surface side of the U-shaped curvature of the C.

  In the image reading apparatus according to the aspect described above, there is a portion that is curved in a U shape in a part of the FFC, and a reverse curved portion is generated depending on the position of the scan unit. For this reason, by performing the reading operation, a part of the FFC repeats reversal between the normal curve and the reverse curve. However, the reverse curvature of the FFC is suppressed by the elasticity of the elastic sheet member. This is because the base section of the elastic sheet member resists FFC reverse bending. For this reason, even if the inversion of the curvature of the FFC is repeated, the stress applied to the FFC is small. Therefore, FFC has a long life. Further, the pressing section of the elastic sheet member presses the FFC against the chassis member from the inner surface side of the U-shaped curve of the FFC. By this pressing, the slip between the FFC and the chassis member is prevented, and the FFC is prevented from being pushed up. Furthermore, since the tip end section of the elastic sheet member is located on the inner surface side of the U-shaped curve of the FFC, even if the scan unit is moved, the tip end of the elastic sheet member is not caught elsewhere. For this reason, the elastic sheet member does not buckle when the scan unit moves.

  The scan unit in the image reading apparatus of the above aspect has a rear surface that stands up away from the chassis member on the side where the FFC faces from the attachment position of one end of the FFC, and one end of the elastic sheet member is the rear surface of the scan unit. The elastic sheet member is bent by the FFC so that the surface on the side attached to the rear surface becomes a convex surface except for the situation where the scan unit has moved to the most side. It is desirable that the FFC is arranged so as to be pressed against the chassis member in a situation other than the situation where the scan unit is moved to the most side due to the reaction force. With such an arrangement of the elastic sheet member, the FFC can be favorably pressed toward the chassis member by the base section of the elastic sheet member.

  An image reading apparatus according to another aspect of the present invention is an apparatus that reads an image of a document and acquires an image signal, and is provided across the entire width direction of the document so as to face a placement surface on which the document is placed. A scan unit that irradiates light on the document and receives reflected light from the document while moving in the longitudinal direction of the document, a chassis member that is located on the opposite side of the placement surface across the scan unit, and a scan on the chassis member A control unit provided at a position that does not move with the movement of the unit, an FFC that connects the scan unit and the control unit, one end is attached to the scan unit, and the FFC is pressed toward the chassis member at a portion other than the one end The FFC has an elastic sheet member, and one end of the FFC is attached to the chassis member side of the scan unit. In addition, a position other than one end is a fixed position that is fixed to a position that does not move with the movement of the scan unit in the chassis member, and a range on one end side of the fixed position is parallel to the movement direction of the scan unit, The elastic sheet member is disposed so as to be bent from the one end toward the one side in the moving direction of the scan unit, curved in a U-shape, enter between the scan unit and the chassis member, and reach a fixed position. The tip section including the tip on the opposite side is bonded to the outer surface of the U-shaped curve of the FFC.

  In the image reading apparatus according to any one of the above aspects, the chassis member is disposed at a position where the outer surface of the U-shaped curve of the FFC is pressed when the scan unit is moved to the one side. It is desirable to have a friction member that prevents the FFC from sliding against the chassis member when the unit is moved in the opposite direction to the one side. Thereby, the slip between FFC and a chassis member is prevented more favorably.

  According to this configuration, there is provided an image reading apparatus that is configured to exchange signals with a scan unit by FFC and that has a simple configuration and has a long FFC life.

It is sectional drawing which shows an example of a reading unit. It is sectional drawing which shows the condition which moved the reading unit of FIG. 1 is a perspective view of an image reading apparatus according to a first embodiment. It is a cross-sectional schematic diagram explaining the positional relationship between a scan unit and a document. It is an expanded sectional view showing the situation of the lower part of a scan unit. It is a top view which shows an elastic sheet member. It is sectional drawing which shows the condition which moved the scanning unit of FIG. FIG. 6 is a cross-sectional view showing a situation when the scan unit is moved from the state of FIG. 5 in the image reading apparatus of the comparative example. It is a width direction sectional view of FFC used in an embodiment. FIG. 6 is an enlarged cross-sectional view corresponding to FIG. 5 in an image reading apparatus according to a second embodiment. FIG. 6 is an enlarged cross-sectional view corresponding to FIG. 5 in an image reading apparatus according to a third embodiment.

[First embodiment]
DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments embodying the present invention will be described below in detail with reference to the accompanying drawings. In this embodiment, the present invention is applied to the image reading apparatus 1 shown in FIG. The image reading apparatus 1 includes a housing 10 and a scan unit 11. The casing 10 is a container-like member that is generally rectangular in shape and open on the upper side. The rectangular short side direction Y of the casing corresponds to the width direction of the document to be read, and the long side direction X corresponds to the longitudinal direction of the document. However, the width direction and the longitudinal direction of the original document here are for convenience, and the width direction dimension may be longer than the longitudinal dimension.

  The scan unit 11 is a long member provided over the entire width dimension of the original. As shown in the schematic sectional view of FIG. 4, an LED light emitting element 12, reflecting mirrors 13 and 14, and a CCD light receiving element 15 are arranged inside the scan unit 11. That is, in this embodiment, the CCD light receiving element 15 is mounted on the scan unit 11. A slit 16 is formed on the upper surface of the scan unit 11. Further, the FFC 22 is attached to the lower portion of the scan unit 11, and the elastic sheet member 29 is attached to the rear surface 28. The FFC 22 is pressed by the elastic sheet member 29. 3 corresponds to a direction perpendicular to the paper surface in FIG.

  Returning to FIG. 3, the housing 10 is provided with rails 17 and 18 parallel to the long side direction X. The scan unit 11 is slidable with respect to the rails 17 and 18. That is, the scan unit 11 is movable in the long side direction X. The housing 10 is further provided with a motor 19 and a belt 20. Thereby, the scan unit 11 is driven in the long side direction X. An FFC 22 is disposed on the bottom surface 21 (chassis member) of the housing 10. A control board 23 is provided outside the housing 10. The scan unit 11 and the control board 23 are connected by the FFC 22.

  The image reading apparatus 1 is mounted on a reading unit of a copier. Or it is mounted on a scanner machine. In a state in which the image reading apparatus 1 is mounted on these devices, the document table glass 24 is positioned above the scan unit 11 as shown in FIG. Then, the downward surface in FIG. 4 of the document 25 placed on the document table glass 24 is the surface to be read. That is, the CCD light receiving element 15 outputs an image signal based on the light emitted from the LED light emitting element 12 and reflected by the reading target surface of the document 25. Of course, this image signal is sent from the scan unit 11 to the control board 23 via the FFC 22. On the other hand, a signal for operating the light emission state of the LED light emitting element 12 is sent from the control board 23 to the scan unit 11 via the FFC 22.

  As shown in FIG. 3, there is a bent portion 26 in the middle of the FFC 22. At the bent portion 26, the FFC 22 is bent obliquely and its longitudinal direction is changed. In the bent portion 26 in FIG. 3, the longitudinal direction of the FFC 22 is changed by 90 °. In FIG. 3, three bent portions are seen, but only one configuration is possible. At the bent portion 26, the FFC 22 is fixed to the bottom surface 21. Further, the FFC 22 in the section between the bent portion 26 and the scan unit 11 is arranged so that the longitudinal direction thereof is parallel to the long side direction X. However, the portion of the FFC 22 closer to the scan unit 11 than the bent portion 26 is arranged so as to crawl on the bottom surface 21, but is not fixed to the bottom surface 21.

  Note that the scan unit 11 visible in FIG. 3 is located closest to the left in the drawing within the movable range. That is, the FFC 22 is moved to the farthest position as viewed from the bent portion 26. Hereinafter, the movement of the scan unit 11 from right to left in FIG. 3 is referred to as forward movement, and the movement from left to right is referred to as backward movement. Further, the position of the scan unit 11 in FIG.

  The enlarged cross-sectional view of FIG. 5 shows the situation of the FFC 22 at a location between the scan unit 11 and the bottom surface 21. In FIG. 5, the upper part and internal components of the scan unit 11 are omitted. As shown in FIG. 5, one end of the FFC 22 is attached to a connector 27 provided at a lower portion of the scan unit 11, that is, a portion on the bottom surface 21 side. The FFC 22 can be inserted into and removed from the connector 27. The connector 27 is connected to the LED light emitting element 12 and the CCD light receiving element 15. FIG. 5 shows a situation in which the scan unit 11 is at the leftmost position of the movement range, that is, the foremost position, as in FIG.

  The FFC 22 is directed from the connector 27 to the left side in the long side direction X (slightly upward in FIG. 5 but from the upper side toward the left side in the long side direction X). It is arranged in a U-shape, passing between the scan unit 11 and the bottom surface 21, and scooping over the bottom surface 21 while heading to the above-described bent portion 26.

  Further, a rear surface 28 is formed on a part of the scan unit 11. The rear surface 28 is a surface that stands up away from the bottom surface 21 on the side where the FFC 22 faces the connector 27 in the scan unit 11. An elastic sheet member 29 is attached to the outer surface of the rear surface 28.

  The elastic sheet member 29 is an elastic resin film (for example, one supplied under the trade name “Mylar”), and is a strip-shaped sheet as shown in FIG. One end of the elastic sheet member 29 is a pasting portion 30 to the rear surface 28. The elastic sheet member 29 has slits 31, 50, 51 formed at three locations. The slit 31 is located near the middle of the elastic sheet member 29 in the longitudinal direction, and the slit 51 is located near the end portion on the opposite side to the attachment location 30. The slit 50 is located between the slit 31 and the slit 51. Thereby, the elastic sheet member 29 is divided into four sections. The proximal end portion 32 on the pasting side from the slit 31, the first middle abdominal portion 52 between the slit 31 and the slit 50, the second middle abdominal portion 53 between the slit 50 and the slit 51, and the distal end on the distal side from the slit 51 Part 33. Each of the slits 31, 50, 51 has a shape for passing the FFC 22. Therefore, when viewed in FIG. 5, the first middle abdomen 52 and the tip 33 of the elastic sheet member 29 are located on the curved inner surface side of the FFC 22. On the other hand, the proximal end portion 32 and the second middle abdominal portion 53 are located on the outer surface side of the curved shape of the FFC 22.

  When the scan unit 11 as described above is moved rightward from the position shown in FIG. 5, the state shown in FIG. 7 is obtained. FIG. 7 shows a state corresponding to FIG. Of course, the main difference between FIG. 7 and FIG. 2 is the presence of the elastic sheet member 29. In FIG. 7, due to the presence of the elastic sheet member 29, the reverse curve of the portion shown as the range C in FIG. This point will be described. In FIG. 7, compared to FIG. 5, the FFC 22 protrudes to the left larger than the scan unit 11 and is curved in a U shape as the scan unit 11 moves to the right. For this reason, the elastic sheet member 29 is curved. That is, the elastic sheet member 29 in FIG. 7 is curved so that the surface attached to the rear surface 28 is convex. The elastic sheet member 29 presses the FFC 22 toward the bottom surface 21 at the base end portion 32 by the reaction force of the curve. Accordingly, in FIG. 7, the reverse curvature of the FFC 22 as shown in FIG. 2 is alleviated.

  When the scan unit 11 is moved leftward from the state of FIG. 7, the state naturally returns to the state of FIG. That is, the distal end portion 33 of the elastic sheet member 29 is not caught between other places. Further, the elastic sheet member 29 is not buckled. Of course, this is because the leading end 33 of the elastic sheet member 29 enters the inner surface side of the FFC 22 by the slit 31.

  5, the FFC 22 is pressed against the bottom surface 21 by the first middle part 52 of the elastic sheet member 29. For this reason, in the range where the 1st middle part 52 exists, the frictional force between FFC22 and the bottom face 21 is strong. Therefore, the FFC 22 is less likely to slip with respect to the bottom surface 21 in this range. Therefore, when the scan unit 11 is moved rightward (backward) from the position in FIG. 5, the FFC 22 does not move away from the bottom surface 21 on the right side (rear side) of the scan unit 11.

  If there is no pressing by the first middle abdomen 52, the FFC 22 is slidable with respect to the bottom surface 21 in the state of FIG. For this reason, when the scan unit 11 is moved backward from that state, the FFC 22 that is curved in a U shape under the scan unit 11, as shown in FIG. On the other hand, it may move with the scan unit 11 while sliding. In such a case, as indicated by an arrow A in FIG. 8, the FFC 22 is swung up on the right side (rear side) of the scan unit 11. Then, the FFC 22 in the portion that has been pushed up may be sandwiched between the scan unit 11 and the housing 10. In addition, the FFC 22 in the portion that has been pushed up may come into contact with other portions (such as the document table glass 24 in FIG. 4) in the image reading apparatus 1. For this reason, since FFC22 is worn out, it is not preferable.

  In this embodiment, the above disadvantages are eliminated by the first middle abdomen 52. In addition, a second middle abdomen 53 is provided between the first middle abdomen 52 and the tip part 33 in the elastic sheet member 29. Unlike the first middle abdomen 52 and the distal end 33, the second middle abdomen 53 is located on the outer surface side of the curved shape of the FFC 22. In other words, the elastic sheet member 29 intersects the FFC 22 twice between the first middle part 52 and the tip part 33. Accordingly, the tip 33 of the elastic sheet member 29 is not so far away from the FFC 22 regardless of the movement state of the scan unit 11.

  The FFC 22 in this embodiment may be the same as the FFC 102 shown in FIGS. 1 and 2, or may be as shown in FIG. The FFC 22 shown in the cross-sectional view in the width direction of FIG. 9 has a multilayer structure. The transmission unit 34 is located substantially at the center in the thickness direction of the FFC 22. A large number of conducting wires 35 are arranged in the transmission unit 34 at intervals in the width direction of the FFC 22. In addition, the transmission unit 34 has a filling resin 36 that insulates between the conductive wires 35. Both surfaces of the transmission unit 34 are covered with a coating layer 37. This transmission unit 34 is the original FFC. In this example, the conductive wire 35 has a thickness T of about 35 μm, a width W of about 320 μm, and a pitch P of about 500 μm.

  The FFC 22 has an impedance adjustment layer 38 and a shield layer 39 on one side thereof (the outward side of the U-shaped curve). The impedance adjustment layer 38 is a layer for adjusting the impedance of the FFC 22, and is a layer for transmitting a high BPS signal (about 1 to 2 GBPS) such as an image signal output from the CCD light receiving element 15 with high efficiency. It is. The shield layer 39 is a layer for preventing noise from leaking from the FFC 22 to the outside. Both the impedance adjustment layer 38 and the shield layer 39 are known. In this example, an adhesive layer 40 is provided between the impedance adjustment layer 38 and the transmission unit 34, and a coating layer 41 is provided on the surface of the shield layer 39.

  On the other hand, a PET layer 42 is provided on the other side (inward side of the U-shaped curve) of the transmission unit 34. The PET layer 42 is a layer for adjusting the position of the bending neutral plane of the FFC 22 as a whole, although it is a mere PET resin layer. That is, due to the presence of the PET layer 42, the bending neutral plane N is set within a certain range of the conducting wire 35. By doing so, even when the FFC 42 is curved, the conductor 35 is not subjected to much stress (tensile or compressive). For this reason, even when the inversion of the curve is repeated, the conductor 35 is hardly broken and has a relatively long life.

  The material of the PET layer 42 may be replaced with another resin other than PET. Further, in the above-described example, the thickness of the PET layer 42 is determined so that the bending neutral plane N is located within a certain range of the conductive wire 35. However, the present invention is not limited to this. Although slightly wider than this, even if the bending neutral surface N is located within the range of the filling resin 36 or within the range of the transmission portion 34, there is a certain effect. Further, instead of paying attention to the bending neutral plane N, the center of the entire thickness of FFC 22 (including the impedance adjustment layer 38, the shield layer 39, and the PET layer 42) is located within a certain range of the conducting wire 35. Even if there is, there is some effect.

  Further, even if the FFC 22 has only one of the impedance adjustment layer 38 and the shield layer 39, there is an effect obtained by providing the PET layer 42 and the elastic sheet member 29. For example, when the CCD light receiving element 15 is not mounted on the scan unit 11 and is fixedly disposed on the housing 10, the necessity of providing the impedance adjustment layer 38 on the FFC is not so high. This is because the image signal is not transmitted by the FFC. Even in such a case, the present invention can be applied.

  As described above in detail, according to the first embodiment, by moving the scan unit 11, in the image reading apparatus 1 that reads the image of the placed document, the stress caused by the reversal of the curvature of the FFC 22 is reduced. Measures are being taken. Specifically, an elastic sheet member 29 is provided in the scan unit 11. As a result, reverse bending of the FFC 22 is suppressed. Further, the elastic sheet member 29 is provided with a first middle part 52 and a tip part 33. The first middle part 52 prevents slipping between the FFC 22 and the bottom surface 21. The tip 33 prevents the elastic sheet member 29 from buckling when the scan unit 11 is moved forward. As a result, the image reading apparatus 1 that realizes reading while curving the FFC 22 and has a long lifetime of the FFC 22 is realized.

[Second form]
In the second embodiment of the present embodiment, a friction member 60 shown in FIG. 10 is added to the first embodiment. The other points are not particularly different from those of the first embodiment. FIG. 10 is a diagram corresponding to FIG. 5 in the first embodiment. As shown in FIG. 10, the friction member 60 is a sheet-like member attached on the bottom surface 21. As the friction member 60, a material having a high friction coefficient such as cork, non-woven fabric, silicon rubber, silicon foam, urethane foam or the like is used. Thereby, a stronger frictional force acts between the FFC 22 and the friction member 60 than between the FFC 22 and the bottom surface 21 in the case of the first embodiment.

  In the present embodiment, in the state shown in FIG. 10, that is, with the scan unit 11 in the foremost position, the FFC 22, the bottom surface 21, and the FFC 22 are pressed against the bottom surface 21 by the first middle part 52 of the elastic sheet member 29. Is more intense than in the first embodiment. This is because the friction member 60 has a high coefficient of friction. For this reason, when the scan unit 11 is moved rightward (backward) from the position in FIG. 10, the FFC 22 does not easily rise on the right side (rear side) of the scan unit 11.

  From the above, as far as the long side direction X in FIG. 3 is concerned, the friction member 60 is provided at least in the range where the FFC 22 is pressed by the first middle part 52 with the scan unit 11 in the foremost position. Good. More preferably, with respect to more than half of the range in which the FFC 22 contacts the bottom surface 21 with the scan unit 11 in the foremost position (the range from the bent portion 26 in FIG. 3 to the lower end position of the range B in FIG. 10). The friction member 60 should just be provided. If there is only this, even if the FFC 22 is swung up, it will be after the scan unit 11 has moved a considerable amount backward. This is because, at that time, the scan unit 11 has already advanced ahead of the FFC 22 that has been pushed up, so that the FFC 22 is not caught by the scan unit 11. Further, as far as the short side direction Y in FIG. 3 is concerned, it is sufficient that the FFC 22 is provided in a range where it can be pressed against the bottom surface 21.

[Third embodiment]
In the third embodiment, the elastic sheet member is stopped from intersecting with the FFC 22 and the tip of the elastic sheet member is attached to the FFC 22 instead of the first embodiment. That is, as shown in FIG. 11, in this embodiment, an elastic sheet member 61 is used instead of the above-described elastic sheet member 29. The elastic sheet member 61 is the same as the elastic sheet member 29 except that the slits 31, 50, 51 shown in FIG. 6 are not formed.

  As shown in FIG. 11, the elastic sheet member 61 is affixed to the rear surface 28 of the scan unit 11 at the affixing point 64 on the base end side, as in the first and second embodiments. And the area | region 63 of the front end side from the location 62 of a mid-abdominal part is affixed on the outer surface of the U-shaped curve in FFC22 entirely. Even in such a form, the reverse bending of the FFC 22 and the buckling prevention of the elastic sheet member 61 are realized in substantially the same manner as in the first form. Also, the friction member 60 of the second embodiment can be applied to this embodiment. In that case, slippage between the FFC 22 and the bottom surface 21 is also prevented.

  Note that this embodiment is merely an example, and does not limit the present invention. Therefore, the present invention can naturally be improved and modified in various ways without departing from the gist thereof.

  For example, the elastic sheet member 29 may be modified in how it is attached. In the above-described example, as shown in FIG. 7, the elastic sheet member 29 (the same applies to the elastic sheet member 61 of the third embodiment) is provided on the rear surface 28 of the scan unit 11. It is conceivable to attach the elastic sheet member 29 (61) to the lower surface of the sheet. In this case, the elastic sheet member 29 (61) is attached to the lower surface of the connector 27. In this case, another slit is provided in the elastic sheet member 29, and the elastic sheet member 29 is arranged so that it once exits outside the FFC 22 and then returns to the inside again at the tip 33. The elastic sheet member 61 is also provided with one slit. In this case, when the FFC 22 tries to bend backward, the elastic sheet member 29 (61) is also bent in the same direction. Therefore, reverse bending is suppressed by the reaction force. In addition, a configuration in which the elastic sheet member 29 (61) is attached by being sandwiched between the lower surface of the scan unit 11 and the FFC 22 is also possible.

DESCRIPTION OF SYMBOLS 1 Image reading apparatus 10 Housing 11 Scan unit 21 Bottom face 22 FFC
23 Control board 26 Bending point (fixed position)
28 Rear surface 29 Elastic sheet member 30 Affixing location 31 Slit 32 Base end (root section)
33 tip 52 first middle abdomen (pressing section)
53 Second middle abdomen (intersection)
60 Friction member 61 Elastic sheet member 63 Region

Claims (4)

An image reading device that reads an image of a document and obtains an image signal,
A scanning unit that is provided across the entire width direction of the document so as to face the placement surface on which the document is placed, and that performs light irradiation on the document and reception of reflected light from the document while moving in the longitudinal direction of the document;
A chassis member located on the opposite side of the mounting surface across the scan unit;
A controller provided at a position that does not move with the movement of the scan unit in the chassis member;
A flexible flat cable connecting the scan unit and the control unit;
One end is attached to the scan unit and has an elastic sheet member that presses the flexible flat cable toward the chassis member at a portion other than the one end.
The flexible flat cable is
One end is attached to a portion of the scan unit on the chassis member side, and a position other than the one end is a fixed position fixed at a position where the scan unit does not move with the movement of the scan unit,
The range on the one end side of the fixed position is parallel to the moving direction of the scan unit,
From one end to the one side in the moving direction of the scan unit, it is arranged so as to be bent in a U shape and enter between the scan unit and the chassis member to reach the fixed position,
The elastic sheet member is
The flexible section includes a tip section including a tip opposite to the one end and a pressing section corresponding to a section in which the flexible flat cable is pressed against the chassis member when the scan unit is moved to the one side most. Located on the inner side of the U-shaped curve of the flat cable,
The intersection section between the tip section and the pressing section and at least a part of the root section between the pressing section and the one end are located on the outer surface side of the U-shaped curve of the flexible flat cable. An image reading apparatus. The image reading apparatus according to claim 1,
The scan unit has a rear surface that is erected in a direction away from the chassis member on the side toward which the flexible flat cable is directed from the attachment position of the one end of the flexible flat cable.
The one end of the elastic sheet member is attached to the rear surface of the scan unit;
The elastic sheet member is
Except for the situation where the scan unit has moved to the one side most, it is curved by the flexible flat cable so that the surface attached to the rear surface becomes a convex surface,
Due to the reaction force of the curve, the flexible flat cable is arranged to be pressed against the chassis member in a situation other than the situation where the scan unit is moved to the one side most. Image reading device. An image reading device that reads an image of a document and obtains an image signal,
A scanning unit that is provided across the entire width direction of the document so as to face the placement surface on which the document is placed, and that performs light irradiation on the document and reception of reflected light from the document while moving in the longitudinal direction of the document;
A chassis member located on the opposite side of the mounting surface across the scan unit;
A controller provided at a position that does not move with the movement of the scan unit in the chassis member;
A flexible flat cable connecting the scan unit and the control unit;
One end is attached to the scan unit and has an elastic sheet member that presses the flexible flat cable toward the chassis member at a portion other than the one end.
The flexible flat cable is
One end is attached to a portion of the scan unit on the chassis member side, and a position other than the one end is a fixed position fixed at a position where the scan unit does not move with the movement of the scan unit,
The range on the one end side of the fixed position is parallel to the moving direction of the scan unit,
From one end to the one side in the moving direction of the scan unit, it is arranged so as to be bent in a U shape and enter between the scan unit and the chassis member to reach the fixed position,
The image reading apparatus according to claim 1, wherein the elastic sheet member has a tip section including a tip opposite to the one end bonded to the outer surface of the U-shaped curve of the flexible flat cable. An image reading apparatus according to any one of claims 1 to 3, wherein
The chassis member is disposed at a position where the outer surface of the U-shaped curve of the flexible flat cable is pressed in a state where the scan unit is moved to the one side most, and the scan unit is placed on the one side. An image reading apparatus comprising: a friction member that prevents the flexible flat cable from slipping with respect to the chassis member when moved in the opposite direction.

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