JP2015177384A - Image reading apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To appropriately hold a reflection member which performs reflection multiple times, so as to suppress vibration of the reflection member without enlarging the reflection member when positioning and holding the reflection member.SOLUTION: In a reading unit 4 in which an illumination member 5, a plurality of reflection members 9-13, an image forming member 7 and an imaging device 6 are packaged, when positioning and holding the reflection members 10 and 11 which reflect reflection light 8 from a document 2 multiple times, with support members 41 and 42 including three abutting parts 41a, 42a and 43a abutted to one side of the reflection member and a pressing member 43 pressing the reflection member to the three abutting parts from a surface at an opposite side to a surface to which the abutting parts are abutted, at least one of the three abutting parts is disposed inside of a length direction end portion of a reflection area 8a with a maximum length in a length direction in the reflection member.

Description

  The present invention relates to an image reading apparatus such as an image recording apparatus or a scanner. In particular, an illumination member, a plurality of reflecting members, an image forming member, and an image sensor are mounted on the reading unit, and reflected light from the document is reflected by the plurality of reflecting members a plurality of times and guided to the image forming member. In the image reading apparatus in which the reflected light is reduced and imaged on the image pickup device, the feature is that the vibration of the reflecting member can be appropriately suppressed without increasing the size of the reflecting member. It is.

  The scanning method of the scanner using the reduction optical system includes a mirror scanning method in which reading is performed by scanning two sliders equipped with three reflecting members, an illumination member such as an LED, and a plurality of reflections. There are known two types of units, a unit scan method, in which a member, an imaging member such as a lens, and an image pickup device such as a CCD are mounted, and this reading unit is scanned to perform reading.

  Here, the mirror scan method is mainly used in high-speed machines with a high reading speed because the weight of the slider to be scanned is light and the slider can be easily scanned at a high speed. On the other hand, the unit scan method reads a document while maintaining a constant optical path, and has excellent image quality stability. However, since the scanning unit to be scanned is heavy, the reading speed is relatively slow. It was adopted for low speed machines.

  However, in recent years, downsizing of imaging members such as CCDs and imaging members such as lenses has progressed due to reduction in pixel size in imaging devices such as CCDs and higher illumination of LEDs serving as illumination members. For this reason, it is possible to reduce the size and weight of the reading unit, and it is considered that the adoption of the unit scan method will progress even in the high-speed machine area where the mirror scan method has been mainstream.

  Here, in the unit scan method, reflected light from the document is folded and reflected in the reading unit using a plurality of reflecting members. In order to reduce the size and weight of the reading unit, It is necessary to use a thin reflective member.

  However, if a thin reflective member is used, the reflective member is likely to vibrate, and if the reflective member vibrates, reading unevenness called pitch unevenness, line fluctuation of the read image, and the like are caused, and the quality of the read image is deteriorated. In the unit scan method, a countermeasure for suppressing the vibration of the reflecting member is an important issue.

  Here, the reflecting member used in the reading unit is generally elongated, and when fixing the reflecting member, both end portions in the longitudinal direction are pressed and fixed to the support portion by an elastic member such as a leaf spring. It is common.

  However, when pressing and fixing to the support portion at both ends in the longitudinal direction of the reflecting member in this way, the central portion in the longitudinal direction is likely to bend, and the sensitivity to the quality of the read image is generally considered to be high at 100 Hz to 500 Hz. The reflecting member is likely to vibrate in the frequency band. For this reason, with respect to a thin reflective member used in the unit scan method, the method in which both end portions in the longitudinal direction are pressed and fixed to the support portion has a problem that vibration is likely to occur in the reflective member.

  And in patent document 1, in order to prevent a vibration of a reflection member, two support members are provided in the position inside the longitudinal direction both ends of a long reflection member, and the transversal direction both sides of a reflection member are provided by each support member. A structure for supporting this part is shown.

  In Patent Document 2, the length of the reflective member in the longitudinal direction is increased, and two support members are provided at positions on both sides of the writing utilization range and at both ends in the longitudinal direction of the reflective member. The supporting member is supported at three locations by one supporting member, and two supporting members are provided at both ends in the longitudinal direction of the reflecting member that are extended by the two supporting members on both sides in the longitudinal direction, and reflected by the two supporting members. Shown is one that supports both ends in the longitudinal direction of the member.

  Here, in what was shown by the said patent documents 1 and 2, in order to support a reflective member in the position inside the longitudinal direction both ends of a reflective member, a reflective member is supported in the longitudinal direction both ends of a reflective member. Compared to the case, the amplitude of the reflecting member can be suppressed by shifting the frequency at which the reflecting member vibrates to a high frequency region.

  Here, in what is shown in Patent Document 1, a structure in which the two supporting members support the parts on both sides in the short direction of the reflecting member, that is, two supporting parts on each of both sides in the longitudinal direction of the reflecting member, The reflection member is supported by a total of four support portions. However, when the reflection member is supported by the four support portions in this way, if the positions, sizes, etc. of the four support portions are not uniform, the reflection member may rattle or the reflection member may be impossible. There is a problem that force is applied and the reflecting member is deformed to reduce flatness.

  Moreover, in what is shown by patent document 2, in order to support a reflective member in three places by two support members in the position which is the both sides of the writing utilization range and inside the longitudinal direction both ends, it is reflective. The member is pressed and positioned at these three locations, and the reflection member is prevented from rattling. However, the two support members are provided on both sides of the writing utilization range as described above, and the reflection member is further extended on both sides in the longitudinal direction than the two support members. Since two supporting members are provided at both ends in the longitudinal direction of the reflecting member, the length of the reflecting member in the longitudinal direction becomes very long and its weight increases, the reading unit becomes larger, and the reading unit becomes smaller and lighter. There was a problem of going backwards.

JP-A-5-297260. JP 2000-241735 A.

  In the present invention, an illumination member, a plurality of reflecting members, an imaging member, and an image sensor are mounted on a reading unit, and reflected light from a document is reflected by a plurality of reflecting members a plurality of times to guide the imaging member to form an image. It is an object of the present invention to solve the above-described problems in an image reading apparatus in which reflected light is reduced by a member to form an image on the image sensor.

  SUMMARY OF THE INVENTION An object of the present invention is to make it possible to appropriately suppress vibration of a reflecting member without increasing the size of the reflecting member in the image reading apparatus as described above.

  In the present invention, in order to solve the above-described problems, an illumination member, a plurality of reflecting members, an imaging member, and an image sensor are mounted on a reading unit, and reflected light from a document is reflected by the plurality of reflecting members. In an image reading apparatus that reflects a plurality of times by a member and guides it to the imaging member, and reduces the reflected light by the imaging member to form an image on the imaging device, at least one of the plurality of reflecting members is reflected The member performs a plurality of reflections on the reflection surface, and the plurality of reflection regions that perform the plurality of reflections are arranged in the short direction of the reflection member, and the reflection member that performs the plurality of reflections is Positioning by means of a support member having three abutting portions that abut one side of the reflecting member, and a pressing member that presses the reflecting member against the three abutting portions from the surface opposite to the surface abutting the abutting portion Retained and before At least one of abutment, were arranged on the inner side of the longitudinal end of one of the reflection region in the reflective member.

  As such an image reading apparatus, a support member having one abutting portion that abuts on a reflecting surface on one end side in the longitudinal direction of the reflecting member that performs the plurality of reflections is provided, and the reflecting member A support member having two contact portions that contact the reflection surface on the other end side in the longitudinal direction is provided, and the support member having the one contact portion has a reflection member along the short direction of the reflection member. The leg extending to the reflecting surface of the reflecting member is provided at a position inside the end of the reflecting region having the longest longitudinal length so as not to intersect the reflecting region of the reflecting member. The thing provided with the contact part can be used.

  In addition, as such an image reading apparatus, a support member having one abutting portion that abuts on a reflecting surface on one end side in the longitudinal direction of the reflecting member that performs the plurality of reflections is provided, and the reflecting member A supporting member having two abutting portions that abut on the reflecting surface on the other end side in the longitudinal direction of the reflecting member is provided, and the supporting member having the two abutting portions is opposed along the short direction of the reflecting member. In this way, the two leg portions extended to the reflecting surface of the reflecting member are provided at a position inside the end of the reflecting region having the longest length in the longitudinal direction so as not to intersect the reflecting region of the reflecting member. These two leg portions each having the abutting portion can be used.

  Further, the support member having one abutting portion as described above is configured so that the leg portion extending to the reflecting surface of the reflecting member along the short direction of the reflecting member does not intersect the reflecting area of the reflecting member. And provided at a position inside the end of the reflection region having the longest length in the longitudinal direction, the abutting portion is provided on the leg portion, and the supporting member having two abutting portions is provided on the supporting member. The ends of the reflective region with the longest length in the longitudinal direction so that the two legs extending on the reflective surface of the reflective member so as to face each other along the short direction do not intersect the reflective region of the reflective member It is possible to use one provided at a position on the inner side of the part and provided with the contact part on each of the two leg parts.

  Further, as described above, a support member having one abutting portion that abuts on the reflection surface on one end side in the longitudinal direction of the reflection member that performs the reflection a plurality of times is provided, and on the other end side in the longitudinal direction of the reflection member. In an image reading apparatus provided with a support member having two abutting portions that abut against the reflecting surface, when the reflecting member is pressed against each abutting portion by the pressing member, the abutting is performed via the reflecting member. A notch for attaching the pressing member to the support member is provided so as to face the portion, and the reflecting surface of the reflecting member is pressed against the contact portion by the pressing member attached to the notch. Can be.

  In addition, the image reading apparatus includes a contact portion that is in contact with a surface opposite to the reflection surface on one end side in the longitudinal direction of the reflection member that performs the plurality of reflections. A support member provided with two abutting portions that abut on the surface opposite to the reflecting surface on the other end side in the longitudinal direction of the at least one side of the one abutting portion and the two abutting portions. The contact portion is provided at a position inside the end portion of the reflection region having the longest length in the longitudinal direction in the reflection member, and the pressing member that presses the reflection member against the contact portion is It is possible to use one that extends to the reflecting surface of the reflecting member along the short direction of the reflecting member so as not to intersect the reflecting region of the reflecting member.

  Further, the one abutting portion and the two abutting portions are provided at a position inside the end portion of the reflecting region having the longest length in the longitudinal direction in the reflecting member, and the pressing member is disposed in the longitudinal direction. Extending to the reflecting surface of the reflecting member along the short direction of the reflecting member so as not to intersect the reflecting area of the reflecting member at a position inside the end of the reflecting region having the longest length in the direction. You can also

  In the image reading apparatus according to the present invention, the reflecting member that performs reflection a plurality of times on the reflecting surface, the support member having three abutting portions that abut on one surface of the reflecting member, and the surface on which the abutting portion abuts. Since the reflecting member is positioned and held by the pressing member that presses the reflecting member against the three abutting portions from the opposite surface, it is possible to prevent the reflecting member from rattling.

  In addition, since at least one of the three abutting portions is arranged on the inner side from the longitudinal end portion of one reflective region in the reflective member, without increasing the longitudinal size of the reflective member, The vibration of the reflecting member can be appropriately suppressed.

1 is a schematic explanatory diagram of an image reading apparatus according to an embodiment of the present invention. FIG. 5 is a schematic explanatory diagram illustrating a state in which reflected light from a document is guided to an image sensor in the reading unit in the image reading apparatus according to the embodiment. In the above-described reading unit, in the reflecting member that reflects reflected light twice, the longitudinal direction of the reflecting area where the reflected light is reflected the second time is larger than the width in the longitudinal direction of the reflecting area where the reflected light is reflected first. It is the schematic front view which showed the state from which the width | variety becomes small. It is explanatory drawing which showed the optical path expansion | deployment of a reduction optical system in the reading unit in the image reading apparatus which concerns on the said embodiment. In the image reading apparatus according to the embodiment, it is a schematic perspective view showing a first holding form in which a reflecting member that reflects reflected light twice is positioned and held by two supporting members. In the said 1st holding | maintenance form, it is the schematic front view seen from the reflective surface side of the reflective member positioned and hold | maintained at two support members. FIG. 5 is a schematic side view of the first holding configuration as viewed from the support member side in which one contact portion is brought into contact with a reflection surface of a reflection member where reflected light is reflected twice. FIG. 6 is a schematic side view of the first holding configuration as viewed from a support member side in which two contact portions are brought into contact with a reflection surface of a reflection member that reflects reflected light twice. In the first holding configuration, (A) is a schematic perspective view showing a state in which a pressing member is attached to a supporting member provided with one abutting portion, and (B) shows a pressing member from the supporting member. It is the schematic perspective view which showed the state removed. In the first holding configuration, (A) is a schematic perspective view showing a state in which a pressing member is attached to a supporting member provided with two abutting portions, and (B) shows a pressing member from the supporting member. It is the schematic perspective view which showed the state removed. It is the schematic front view which showed the prior art example which supported two reflection members by the some support part in performing reflection twice. In the image reading apparatus according to the above-described embodiment, a schematic perspective view showing a second holding configuration in which a reflecting member that reflects reflected light twice is positioned and held by two supporting members. In the said 2nd holding | maintenance form, it is the schematic front view seen from the reflective surface side of the reflective member positioned and hold | maintained at two support members. In the second holding configuration, it is a schematic side view seen from the support member side in which one contact portion is brought into contact with the reflection surface of the reflection member where reflected light is reflected twice. In the second holding configuration, it is a schematic side view seen from the support member side in which two contact portions are brought into contact with the reflection surface of the reflection member where reflected light is reflected twice. In the image reading apparatus according to the embodiment, a schematic perspective view showing a third holding configuration in which a reflecting member that reflects reflected light twice is positioned and held by one supporting member. In the said 3rd holding | maintenance form, it is the schematic front view which showed the supporting member which provided the three contact part in the wall surface of the base part which mounts the reflective member in which reflected light is reflected twice. In the said 3rd holding | maintenance form, it is the schematic front view seen from the reflective surface side of the reflective member positioned and hold | maintained at one support member. In the said 3rd holding | maintenance form, it is the schematic side view which showed the state which made the said supporting member position and hold | maintain the reflecting member in which reflected light is reflected twice.

  Next, an image reading apparatus according to an embodiment of the present invention will be specifically described with reference to the accompanying drawings. Note that the image reading apparatus according to the present invention is not limited to those shown in the following embodiments, and can be implemented with appropriate modifications within a range not changing the gist thereof.

  In the image reading apparatus 1 of this embodiment, as shown in the schematic explanatory diagram of FIG. 1, a reading unit 4 that is movably attached is located below the document 2 placed on the platen glass 3. Is scanned in the direction of the arrow to read an image on the document 2.

  Here, as shown in the schematic explanatory diagram of FIG. 2, the reading unit 4 reflects the illumination member 5 composed of an LED or the like that irradiates light on the document 2 and the reflected light 8 from the document 2 a plurality of times. The imaging member 7 including the first to fifth reflecting members 9 to 13, a lens or the like to which the reflected light reflected by the first to fifth reflecting members 9 to 13 is guided, and the imaging member 7 reduce the size. An imaging element 6 comprising a CCD or the like that reads the image by forming reflected light is mounted.

  In the reading unit 4, the reflected light 8 from the document 2 is reflected from the first reflecting member 9 to the second reflecting member 10 and then reflected from the second reflecting member 10 to the third reflecting member 11. After being reflected from the third reflecting member 11 so as to be folded back to the second reflecting member 10 and reflected so as to be folded back from the second reflecting member 10 to the third reflecting member 11, the third reflecting member 11 to the fourth reflecting member After being reflected by the reflecting member 12 and further reflected from the fourth reflecting member 12 to the fifth reflecting member 13, it is guided from the fifth reflecting member 13 to the imaging member 7, and the reflected light 8 is reflected by the imaging member 7. Is reduced so that an image is formed on the light receiving surface of the image sensor 6.

  Here, in this embodiment, as described above, the reflected light 8 is reflected twice by the second reflecting member 10 and the third reflecting member 11, respectively. 11 is performed on the lower side in the short direction, and the second reflection is performed on the upper side in the short direction of the reflecting members 10 and 11.

  When the reflected light 8 is reflected twice in each of the reflecting members 10 and 11 in this way, as shown in FIG. 3, the shortness of each reflecting member 10 (11) where the reflected light 8 is reflected first is shown. The longitudinal width of the first reflective region 8a on the lower side in the hand direction is increased, and the length of the second reflective region 8b on the upper side in the short direction of each reflecting member 10 (11) where the reflected light 8 is reflected the second time. The direction width becomes smaller.

  Here, when the reflected light 8 is reflected twice in this way, the width in the longitudinal direction of the reflective region 8a where the reflected light 8 is reflected first is large, and the reflected light 8 is reflected the second time. The reason why the width in the longitudinal direction of the region 8b is reduced will be described with reference to an explanatory diagram showing the optical path development of the reduction optical system shown in FIG.

  Although a plurality of reflecting members are not shown in FIG. 4, the reflected light reflected from the document 2 as described above is guided to the imaging member 7 while being reflected by the plurality of reflecting members. 7, the reflected light 8 is reduced and imaged on the image pickup device 6. In such a reduction optical system, as the optical path length x of the reflected light reflected from the document 2 becomes longer. Thus, the optical path width y of the reflected light gradually decreases.

  For this reason, in each reflecting member 10 (11) in which the reflected light 8 is reflected twice, the reflected light 8 is reflected at the position where the reflected light 8 is reflected first when the optical path length x of the reflected light 8 from the document 2 is short. 8 at the position where the optical path width y is increased and the longitudinal width of the reflection area 8a is increased, and the optical path length x from the original 2 is longer than the position of the first reflection, and the second reflection is performed. The optical path width y of the reflected light 8 is reduced, and the longitudinal width of the reflective region 8b is reduced.

  Next, the 1st holding | maintenance form which positions and hold | maintains each reflection member 10 (11) in which reflection is performed twice as mentioned above is demonstrated based on FIGS.

  In this first holding configuration, as shown in FIGS. 5 and 6, the reflective region in which the longitudinal width is reduced at the one end side in the longitudinal direction of the reflecting member 10 (11) is reduced. The reflecting member 10 (11) is located at a position closer to the end in the longitudinal direction than the reflecting member 10 (11), at a position on the inner side in the longitudinal direction from the reflecting region 8a where the first reflecting is performed. A longitudinal direction in which the first reflection is performed on the other end side in the longitudinal direction of the reflecting member 10 (11) while the supporting member 41 for supporting the abutting portion 41a in contact with the reflecting surface of (11) is provided. The two abutting portions 42a and 42b are brought into contact with the reflecting surface of the reflecting member 10 (11) at a position closer to the end in the longitudinal direction of the reflecting member 10 (11) than the reflecting region 8a having a larger width. A supporting member 42 for supporting is provided.

  Here, in the supporting member 41 that supports the reflecting member 10 (11) on one end side in the longitudinal direction by bringing one abutting portion 41a into contact with the reflecting surface of the reflecting member 10 (11), FIG. As shown in FIGS. 9A and 9B, a mounting portion 41c having a space into which the reflecting member 10 (11) is inserted is provided, and the reflecting member 10 (11) is shorted from the upper side of the mounting portion 41c. The leg portion 41d along the hand direction is extended to the central portion of the reflecting surface of the reflecting member 10 (11) that does not intersect the reflecting region 8a having a larger width in the longitudinal direction, and the leg portion 41d has a convex shape. The abutting portion 41a is provided, and the abutting portion 41a is abutted against the reflecting surface of the reflecting member 10 (11).

  Further, a notch 44 is provided at a position of the mounting portion 41c facing the one abutting portion 41a via the reflecting member 10 (11), and a pressing member 43 made of a leaf spring is attached to the notching 44, and this pressing member 43, the reflecting surface of the reflecting member 10 (11) is pressed against the abutting portion 41a from the surface opposite to the reflecting surface of the reflecting member 10 (11), and one end of the reflecting member 10 (11) in the longitudinal direction is pressed. The support member 41 is positioned and held on the side. In attaching the pressing member 43 to the notch 44, the pressing member 43 is provided with a cut-and-raised piece 43a, and the cut-and-raised piece 43a is engaged with the edge of the notch 44 so that the pressing member 43 is attached to the notch 44. I have to.

  On the other hand, in the supporting member 42 that supports the reflecting member 10 (11) on the other end side in the longitudinal direction by bringing the two abutting portions 42a and 42b into contact with the reflecting surface of the reflecting member 10 (11), FIG. 8 and FIGS. 10A and 10B, a mounting portion 42c into which the reflecting member 10 (11) is inserted is provided, and the mounting portion 42c is provided along the short direction of the reflecting member 10 (11). A leg portion 42e continuous from the upper side to the lower side is provided at a position closer to the end in the longitudinal direction than the reflection region 8a having a larger longitudinal width where the first reflection is performed, and the leg portion 42e is convex. The two abutting portions 42a and 42b are provided in the short direction of the reflecting member 10 (11) with a required interval, and the two abutting portions 42a and 42b are provided on the reflecting surface of the reflecting member 10 (11). It is made to contact.

  Further, a notch 44 is provided at a position of the mounting portion 42c facing the central portion of the two contact portions 42a and 42b via the reflecting member 10 (11), and a pressing member 43 made of a leaf spring is provided in the notch 44. The reflection member 10 (11) is pressed against the reflection surface of the reflection member 10 (11) from the surface opposite to the reflection surface of the reflection member 10 (11) by the pressing member 43, and the reflection member 10 (11) is pressed. The other end side in the longitudinal direction of 10 (11) is positioned and held by this support member 42. In attaching the pressing member 43 to the notch 44, similarly to the case described above, the pressing member 43 is provided with the cut and raised piece 43a, and the cut and raised piece 43a is engaged with the edge of the notch 44 to thereby press the pressing member 43. 43 is attached to the notch 44.

  And in this 1st holding | maintenance form, the reflection member 10 (11) in which reflection twice is performed as mentioned above, the mounting part 41c of the support member 41 in which one contact part 41a was provided, and 2 The support member 42 provided with two contact portions 42a and 42b is inserted and attached to the mounting portion 42c, and the reflection member 10 is connected to a total of three contact portions 41a, 42a and 42b provided on the support members 41 and 42. The reflecting surface of the reflecting member 10 (11) is brought into contact with the reflecting member 10 (11) by the pressing members 43 and 43 from the surface opposite to the reflecting surface of the reflecting member 10 (11). The reflecting members 10 (11) are positioned and held by the two support members 41 and 42 by pressing the portions 41a, 42a and 42b.

  In this way, the reflecting member 10 (11) that performs the reflection twice is positioned in an appropriate state by being pressed by a total of three contact portions 41a, 42a, 42b provided on the support members 41, 42. If the position and size of the four support portions are not uniform as in the conventional case where the reflection member is supported by the four support portions, the reflection member will rattle. Or the reflective member is deformed and the flatness is lowered, thereby causing no focus shift or worsening the depth of focus.

  Next, as shown in FIG. 11, the two reflection members 100 and 101 are used for the second reflection, and the first reflection is performed on the lower reflection member 100, while the second reflection is performed on the upper reflection member 101. Comparison is made between the conventional one that reflects the light and the first holding form.

  Here, in the one shown in FIG. 11, the width in the longitudinal direction of the reflecting region 8a in the reflecting member 100 located below is larger than the width in the longitudinal direction of the reflecting region 8b in the reflecting member 101 located above. The reflection member 100 is supported by the support portions 110 and 111 at a position closer to the end in the longitudinal direction than the reflection region 8a in the reflection member 100 positioned below, and from the reflection region 8b in the reflection member 101 positioned above. Also, the reflection member 101 is held by the support portions 112 and 113 at the position on the end side in the longitudinal direction.

  Then, in the reflection member 100 positioned below the longitudinal width of the reflection region 8a as described above, when held by the support portions 110 and 111 at a position on the end side in the longitudinal direction from the reflection region 8a, It is necessary to lengthen the length of the reflecting member 100 in the longitudinal direction. In particular, in order to suppress the vibration of the reflecting member 100 held by the supporting portions 110 and 111, in general, from the supporting portions 110 and 111, It is preferable that the length of the reflecting member 100 extended to the end portion in the longitudinal direction is 0.1 to 0.3 times the entire length of the reflecting member 110, and for this reason, the reflecting member 100 located below. It is necessary to make the length in the longitudinal direction very long.

  In contrast, in the first holding configuration, one support member 41 that supports the reflection member 10 (11) on one end side in the longitudinal direction is provided with a reflection region in which the width in the longitudinal direction is increased. 8a is provided at a position on the inner side in the longitudinal direction, and the length from which one end side of the reflecting member 10 (11) in the longitudinal direction protrudes from the support member 41 is increased. Even if the length in the direction is shorter than the reflecting member 100 located below shown in FIG. 11, the reflecting member 10 (11) can be appropriately held without vibration, and FIG. The reflecting member 10 (11) can be made smaller and lighter than the size of the two reflecting members 100 and 101 shown in FIG.

  Next, the 2nd holding | maintenance form which positions and hold | maintains each reflection member 10 and 11 in which reflection twice is performed is demonstrated based on FIGS.

  In the second holding configuration, as shown in FIGS. 12 and 13, the second reflection is performed at one end in the longitudinal direction of the reflecting member 10 (11), as in the first holding configuration. The position of the reflecting member 10 (11) is closer to the end in the longitudinal direction than the reflecting region 8b having a reduced longitudinal width, and the reflecting region 8a having a larger longitudinal width in which the first reflection is performed. Also, a support member 41 is provided at a position on the inner side in the longitudinal direction to support one of the contact portions 41a against the reflection surface of the reflection member 10 (11). The reflective surface of the reflective member 10 (11) is pressed by the pressing member 43 so that one end side in the longitudinal direction of the reflective member 10 (11) is positioned and held by the support member 41.

  On the other hand, in this second holding configuration, as shown in FIGS. 12 and 13, the width in the longitudinal direction where the second reflection is performed becomes small on the other end side in the longitudinal direction of the reflecting member 10 (11). At the position on the longitudinal end side of the reflecting member 10 (11) with respect to the reflecting area 8b and at the position on the inner side in the longitudinal direction with respect to the reflecting area 8a in which the width in the longitudinal direction where the first reflection is performed is increased, A support member 45 for supporting the two contact portions 45a and 45b in contact with the reflection surface of the reflection member 10 (11) is provided.

  Here, in the support member 45, as shown in FIGS. 12, 13, and 15, a mounting portion 45c having a space into which the reflecting member 10 (11) is inserted is provided, and the upper portion of the mounting portion 45c is provided. The leg portion 45d extends in the short direction of the reflecting member 10 (11) downward, and extends in the short direction of the reflecting member 10 (11) upward from the lower side of the mounting portion 45c. The leg portions 45e are extended so that the leg portions 45d and 45e do not intersect with the reflection region 8a having a large longitudinal width, and the leg portions 45d and 45e are convexly abutting portions 45a. 45b, and these abutting portions 45a, 45b are brought into contact with the reflecting surface of the reflecting member 10 (11).

  Further, a notch 44 is provided at the position of the mounting portion 45c facing the central portion of the two contact portions 45a and 45b via the reflecting member 10 (11), and a pressing member 43 made of a leaf spring is provided in the notch 44. The reflection member 10 (11) is pressed against the reflection surface of the reflection member 10 (11) by the pressing member 43 from the surface opposite to the reflection surface of the reflection member 10 (11) to the two contact portions 45a and 45b. The other end side in the longitudinal direction of 10 (11) is positioned and held by the support member 45.

  In this way, the reflecting member 10 (11) that performs reflection twice is positioned in an appropriate state by being pressed by a total of three contact portions 41a, 45a, 45b provided on the supporting members 41, 45. If the position and size of the four support portions are not uniform as in the conventional case where the reflection member is supported by the four support portions, the reflection member will rattle. Or the reflective member is deformed and the flatness is lowered, thereby causing no focus shift or worsening the depth of focus.

  Further, in this second holding configuration, the support members 41 and 45 are arranged at positions on the inner side in the longitudinal direction with respect to the reflection region 8a having a larger longitudinal width where the first reflection is performed, and the longitudinal direction. The reflection surface of the reflection member 10 (11) is provided on the support members 41 and 45 by the pressing members 43 and 43 at a position on the inner side in the longitudinal direction of the reflection region 8a having a larger width. The three contact portions 41a, 45a and 45b are pressed and positioned and held so that the reflecting member 10 (11) protrudes from the support members 41 and 45 to both sides in the longitudinal direction.

  For this reason, in this 2nd holding | maintenance form, even if it did not lengthen the length of the longitudinal direction of reflective member 10 (11), the reflective surface of reflective member 10 (11) was provided in the supporting members 41 and 45. The length of the reflecting member 10 (11) protruding from both sides in the longitudinal direction of the reflecting member 10 (11) is increased from the position pressed and held by the three contact portions 41a, 45a, 45b, It is possible to more appropriately suppress the vibration of the reflecting member 10 (11) than the first holding form.

  In the first holding configuration, the support member 41 that supports the support member 41 by contacting one contact portion 41a with the reflection surface of the reflection member 10 (11) has a longer width in the longitudinal direction. While the support member 42 is disposed at a position on the inner side in the longitudinal direction from 8a and supports the two contact portions 42a and 42b on the reflection surface of the reflection member 10 (11), the width in the longitudinal direction is increased. The reflecting member 10 (11) is disposed at a position closer to the end in the longitudinal direction than the reflecting region 8a. However, one abutting portion 41a is brought into contact with and supported by the reflecting surface of the reflecting member 10 (11). The supporting member 41 is disposed at a position closer to the end in the longitudinal direction of the reflecting member 10 (11) than the reflecting region 8a having a larger width in the longitudinal direction, while the reflecting member as shown in the second holding form. Two contact portions 4 on the reflecting surface of 10 (11) a, a support member 45 which supports by contact with 45b, it is also possible to be disposed longitudinally inward position than the reflection region 8a in the longitudinal direction of the width is large.

  Next, the 3rd holding | maintenance form which positions and hold | maintains each reflecting member 10 and 11 in which reflection twice is performed is demonstrated based on FIGS.

  In this third holding configuration, as shown in FIGS. 16 to 18, the reflecting member 10 (11) is placed on the pedestal 47 of the support member 46, and the reflecting surface of the reflecting member 10 (11) On the wall 47a of the pedestal 47 facing the opposite surface, a convex contact portion 46a is provided on one end in the length direction of the reflecting member 10 (11), and the reflecting member 10 (11 ) On the other end side in the longitudinal direction of the projection member, two contact portions 46b and 46c having a convex shape are provided in the short direction of the reflecting member 10 (11) with a required interval.

  Here, in the third holding mode, as shown in FIG. 18, the one abutting portion 46a on one end side in the length direction of the reflecting member 10 (11) and the reflecting member 10 (11). The two abutting portions 46b and 46c on the other end side in the length direction are respectively arranged on the inner side in the longitudinal direction with respect to the reflection region 8a having a larger width in the longitudinal direction where the first reflection is performed in the reflection member 10 (11). This is provided at a position closer to the end in the longitudinal direction than the reflection region 8b in which the width in the longitudinal direction where the second reflection is performed is reduced.

  In the third holding configuration, a pressing member 49 made of a U-shaped leaf spring is provided at a position corresponding to the one contact portion 46a, and the two contact portions 46b and 46c are provided. A pressing member 49 made of a U-shaped leaf spring is provided at a position corresponding to the above.

  Then, as shown in FIG. 19, one end side of each pressing member 49 is inserted into the locking groove portion 48 provided in the supporting member 46 and locked, while the other end of each pressing member 49 is The side is guided from above the reflecting member 10 (11) placed on the pedestal 47 of the supporting member 46 to the reflecting surface of the reflecting member 10 (11) along the short direction of the reflecting member 10 (11). ing.

  Further, as shown in FIG. 18, the center of the reflecting surface of the reflecting member 10 (11) that does not intersect with the reflecting region 8a having a larger width in the longitudinal direction at the other end side of each pressing member 49, 49 is provided. The reflecting surface of the reflecting member 10 (11) is pressed toward the wall surface 47 a of the pedestal portion 47 in the support member 46 by the pressing members 49 and 49.

  If it does in this way, the reflective member 10 (11) in which the surface on the opposite side to the reflective surface of the said reflective member 10 (11) was provided in the wall surface 47a of the base part 47 in the support member 46 by each press member 49,49. ) Is pressed by one abutting portion 46a on one end side in the length direction and two abutting portions 46b and 46c on the other end side in the length direction of the reflecting member 10 (11), and the reflecting member 10 (11). Is positioned and held by the support member 46 on both sides in the longitudinal direction.

  As a result, also in the third holding configuration, the reflection member 10 (11) that performs reflection twice is provided on the support member 46 in a total of 3 as in the first and second holding configurations. The four support members are pressed by the point contact portions 46a, 46b, and 46c to be positioned and held in an appropriate state, and the reflection member is supported by the four support portions as in the conventional case. If there is variation in the position or size of the part, the reflective member will rattle, or the reflective member will be deformed and the flatness will be reduced, causing focus shift or worsening the focus depth. This is no longer the case.

  Further, in the third holding form, the reflection is performed by the pressing members 49 and 49 arranged at positions on the inner side in the longitudinal direction from the reflective region 8a having a larger longitudinal width where the first reflection is performed. The surface opposite to the reflection surface of the member 10 (11) is pressed and held by the three contact portions 46a, 46b, 46c provided on the support member 46, and the reflection member 10 (11) Projecting from the pressing members 49, 49 to both sides in the longitudinal direction.

  Therefore, in this third holding configuration, the reflecting surface of the reflecting member 10 (11) is supported by the pressing members 49, 49 without increasing the length in the longitudinal direction of the reflecting member 10 (11). The reflecting member 10 (11) projecting on both sides in the longitudinal direction of the reflecting member 10 (11) from the position held by being pressed by the three contact portions 46a, 46b, 46c on both sides in the longitudinal direction of the member 46. The length is increased, and the vibration of the reflecting member 10 (11) can be more appropriately suppressed than the first holding form, similarly to the second holding form.

2 Document 3 Platen Glass 4 Reading Unit 5 Illumination Member 6 Imaging Element 7 Imaging Member 8a First Reflection Area 8b Second Reflection Area 9 First Reflective Member 10 Second Reflective Member 11 Third Reflective Member 12 Fourth Reflective Member 13 Fifth reflecting member 41 Support member, 41a contact part, 41c mounting part, 41d leg part 42 Support member, 42a, 42b contact part, 42c mounting part, 42d leg part 43 pressing member, 43a cut and raised piece 44 notch 46 support Member, 46a, 46b, 46c Contact part 47 Base part, 47a Wall surface 48 Locking groove part 49 Pressing member

Claims (6)

An illumination member, a plurality of reflecting members, an imaging member, and an image sensor are mounted on the reading unit, and the reflected light from the document is reflected a plurality of times by the plurality of reflecting members and guided to the imaging member, In the image reading apparatus that reduces the reflected light by the imaging member and forms an image on the imaging element,
At least one of the plurality of reflecting members performs a plurality of reflections on the reflecting surface, and the plurality of reflection regions for performing the plurality of reflections are arranged in the short direction of the reflecting member. ,
The reflecting member that performs the plurality of reflections includes three supporting members having three abutting portions that abut one surface of the reflecting member, and three reflecting members from a surface opposite to the surface that the abutting portion abuts. It is positioned and held by a pressing member that presses the abutting part,
At least one of the contact portions is disposed on the inner side of a longitudinal end portion of one reflection region of the reflection member. The image reading apparatus according to claim 1,
A supporting member having one abutting portion that abuts on the reflecting surface on one end side in the longitudinal direction of the reflecting member that performs the plurality of reflections is provided and contacts the reflecting surface on the other end side in the longitudinal direction of the reflecting member. A support member having two abutting portions in contact with each other is provided;
In the supporting member having the one abutting portion, the leg portion extending to the reflecting surface of the reflecting member along the short direction of the reflecting member does not intersect with the reflecting area in the reflecting member in the longitudinal direction. The image reading apparatus is provided at a position inside the end of the reflection region having the longest length, and the contact portion is provided on the leg portion. The image reading apparatus according to claim 1 or 2,
A supporting member having one abutting portion that abuts on the reflecting surface on one end side in the longitudinal direction of the reflecting member that performs the plurality of reflections is provided and contacts the reflecting surface on the other end side in the longitudinal direction of the reflecting member. A support member having two abutting portions in contact with each other is provided;
The supporting member having the two abutting portions has two legs extending on the reflecting surface of the reflecting member so as to face each other along the short direction of the reflecting member, and a reflecting region in the reflecting member. The image reading device is characterized in that it is provided at a position inside the end portion of the reflection region having the longest length in the longitudinal direction so as not to intersect, and the abutting portions are provided on the two leg portions, respectively. apparatus. The image reading apparatus according to any one of claims 1 to 3,
A notch for attaching the pressing member to the support member is provided so as to face the abutting part via the reflecting member, and the reflecting member is provided with the notch by attaching the pressing member to the notch. An image reading apparatus, wherein a reflection surface of a member is pressed against the contact portion. The image reading apparatus according to claim 1,
One abutting portion that abuts the surface opposite to the reflecting surface is provided on one end side in the longitudinal direction of the reflecting member that performs the plurality of reflections, and the reflecting surface is provided on the other end side in the longitudinal direction of the reflecting member. A supporting member provided with two abutting portions that abut against the opposite surface is used, and at least one abutting portion of the one abutting portion and the two abutting portions is long in the reflecting member. It is provided at a position inside the end of the reflection region having the longest length in the direction,
The pressing member that presses the reflecting member against the abutting portion extends to the reflecting surface of the reflecting member along the short direction of the reflecting member so as not to intersect the reflecting region of the reflecting member. An image reading apparatus. The image reading apparatus according to claim 5.
The one abutting portion and the two abutting portions are provided at a position inside the end portion of the reflecting region having the longest length in the longitudinal direction in the reflecting member,
Reflection of the reflective member along the short direction of the reflective member so that the pressing member does not intersect the reflective region of the reflective member at a position inside the end of the reflective region having the longest length in the longitudinal direction. An image reading device that extends to a surface.

Images