JP2017134431A - Image reading device and image forming apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an image reading device and an image forming apparatus, capable of effectively preventing both spots that may occur in a read image of a document due to interference of light waves in a gap between the document and a transparent plate, and shadows that may occur in the read image of the document due to floating of the document with respect to the transparent plate.SOLUTION: The image reading device including an image reading part including a document placing table and a document pressing part for pressing the document includes a rotation support part for openably/closably supporting the document pressing part on one end side with respect to the image reading part. The image reading part has a first non-document placing area toward the rotation support part from the document placing table outside the document placing table and a second non-document placing area orthogonal to the first non-document placing area. The document pressing part includes a support piece for supporting the document pressing part, while coming into partial contact with the first non-document placing area and the second non-document placing area, when the document pressing part is closed.SELECTED DRAWING: Figure 4

Description

The present invention also relates copier, the image reading apparatus and an image forming equipment such as an image scanner provided in the image forming apparatus such as a facsimile device or a multifunction machine.

  2. Description of the Related Art Conventionally, in image forming apparatuses such as copying machines, facsimile machines, and multifunction machines, in general, a document placed on a transparent plate of a document placing table having a transparent plate such as transparent glass is reliably used as a document placing table. A document pressing device is provided so as to obtain an image with good image quality by being in close contact.

  The document pressing device includes a pressing member that covers and holds the document. The pressing member generally includes a document pressing member and an elastic member that is provided on the document pressing side of the document pressing member and presses the document. The document pressing device has a function of uniformly pressing an elastic member against a document placed on a transparent plate of a document placement table.

  However, in a conventional document pressing device, when an image of a document (especially a glossy document such as a photographic document) is read, if the pressing force of the elastic member on the document is increased, the gap between the document and the transparent plate is reduced. Spots in the scanned image of the original are generated by interference of light waves reflected on both sides (so-called Newton ring). On the other hand, if the pressing force of the elastic member on the original is weakened to prevent spots due to this interference, There is an inconvenience that a shadow is generated in the read image of the document due to floating.

  In this regard, Patent Document 1 discloses that the thickness of the central portion of this surface is formed on the surface facing the contact glass (transparent plate of the document placement table) of the document pressing plate (document pressing member), and By disposing an elastic member in which the thickness around the central portion is continuously reduced in a stepwise or linear manner, a document pressing plate (document pressing member) is opened in Patent Document 2. It has been proposed to provide a plurality of elastic members that protrude when the document is closed and that are in close contact with the document when the document is in the closed state, thereby preventing the document from being displaced or rolled up when the document pressing member is opened or closed.

  Further, in Patent Document 3, at least one of the compression amount and the elastic modulus of the pressing member is gradually reduced from the side closer to the hinge portion toward the side farther from the hinge portion, so that the opening / closing side end portion of the document pressing member can be reduced. It has been proposed to prevent floating.

Japanese Patent Laid-Open No. 5-27339 Japanese Utility Model Publication No. 62-91635 JP 2008-152185 A

  However, the inventions described in Patent Documents 1 and 2 prevent the document from being displaced and wound when the document pressing member is opened and closed, and the invention described in Patent Document 3 is a floating of the opening and closing side end of the document pressing member. In any case, spots that may occur in the read image of the original due to light wave interference in the gap between the original and the transparent plate, and the read image of the original due to the floating of the original with respect to the transparent plate No consideration is given to preventing both possible shadows.

Accordingly, the present invention provides both spots that may occur in a read image of a document due to light wave interference in the gap between the document and the transparent member, and shadows that may occur in the read image of the document due to the floating of the document with respect to the transparent member. and to provide an image reading apparatus and an image forming equipment which can be effectively prevented.

  In order to solve the above-mentioned problems, the present inventor has intensively studied and as a result, a plurality of types of prescribed sizes (for example, A3 size, B4 size, A4) placed on the transparent member of the document placing table having the transparent member. In an image reading apparatus provided with a document pressing device that presses a document of a size, B5 size, A5 size, 2L size, B6 size, A6 size, L size), a document pressing area for pressing a plurality of types of specified size documents In the non-original pressing area of the pressing member having a non-original pressing area outside the original pressing area, the pressing force of the original pressing area to the original is partially restricted (reduced) so that the original pressing area of the pressing member Can be made appropriate for both the portion restricted by the restriction member and the portion not restricted by the restriction member, so that the light wave in the gap between the original and the transparent member can be reduced. Spots that may occur in the document image read by Wataru, and found that can effectively prevent both the shadow that may occur in the document image read by the floating of the document to the transparent member, and completed the present invention.

The present invention is based on such a finding, it provides a next image reading apparatus and an image forming equipment.

(1) Image reading device
An image reading apparatus comprising: an image reading unit including an original document placing table made of a transparent member for placing an original; and an original document pressing unit configured to press the original document placed on the original document placing table. A rotation support unit that supports the document pressing unit so as to be openable and closable at one end side with respect to the reading unit, and the image reading unit is arranged on the outside of the document mounting table from the document mounting table to the rotation supporting unit. A first non-document placement area that faces the first non-document placement area and a second non-document placement area that is orthogonal to the first non-document placement area. And a supporting piece for supporting the document pressing portion while being in partial contact with the first non-document placing area and the second non-document placing area when the cover is closed. An image reading apparatus.

(2) Image forming apparatus An image forming apparatus comprising the image reading apparatus according to the present invention .

According to the present invention, by the support piece, the pressing force of the non-document pressing region odor Te to the document of originals pressing region can be partially restricted (reduced). Therefore, the pressing force in the original pressing area can be made appropriate in both the portion restricted by the support piece and the portion not restricted, and thereby the space between the original and the transparent member can be made. It is possible to effectively prevent both spots that may occur in the read image of the document due to interference of light waves in the gap and shadows that may occur in the read image of the document due to the floating of the document with respect to the transparent member. . Moreover, it said document pressing region can be a region for pressing the original maximum size of the provisions size, thereby not only applicable to a small predetermined prescribed size than the maximum size, the maximum size This can also be applied to the above document. These are particularly effective when the original is a glossy original such as a photographic original (for example, a glossy paper original).

In the present invention, it is possible to exemplify an aspect in which the support piece is provided so as to come into contact with a support region that supports the document placing table when the document pressing portion is closed .

In the present invention, one or a plurality of the support pieces are provided in each of a region corresponding to the first non-document placement region and a region corresponding to the second non-document placement region in the document pressing portion. The aspect currently described can be illustrated .

In the present invention, the second non-document placement region is a pair of second non-document placement regions on one side and the other side with the document placement table in the rotation axis direction of the rotation support portion. In this case, one or a plurality of the support pieces may be provided in regions corresponding to the pair of second non-document placement regions of the document pressing portion .

In the present invention, each of the support pieces provided in a region corresponding to the pair of second non-document placement regions of the document pressing portion is in a direction orthogonal to the rotation axis direction of the rotation support portion. The aspect provided in the same position or substantially the same position can be illustrated.

In the present invention, it is possible to exemplify a mode in which the support piece is provided outside the rotation support portion in the rotation axis direction of the rotation support portion in the document pressing portion .

In the present invention, it is possible to exemplify a mode in which the rotation support unit is supported so as to be movable in the vertical direction with respect to the image reading unit .

In the present invention, it is possible to exemplify an aspect in which an elastic member that is provided in the document pressing portion and presses the document is provided, and the support piece is a protrusion-like member having rigidity .

In the present invention, the first non-document placement area and the second non-document placement area can be exemplified as being provided around the document placement table in the image reading unit .

As described on the following, according to the present invention, spots may occur in reading the image of the original by the interference of light waves in the gap between said transparent member and the original, and, by lifting of the document relative to said transparent member Both shadows that can occur in the read image of the original can be effectively prevented.

1 is a schematic cross-sectional view of an image forming apparatus including an image reading apparatus according to an embodiment of the present invention when viewed from the front. FIG. 2 is a schematic plan view of the image reading apparatus mounted on the image forming apparatus shown in FIG. 1 as viewed from above. FIG. 3 is a schematic cross-sectional view of the image reading apparatus shown in FIGS. 1 and 2 when viewed from the front. FIG. 4 is a schematic perspective view of a state in which a document pressing device of the image reading apparatus shown in FIGS. FIG. 4 is a schematic cross-sectional view showing a contact glass, a support portion, and a regulating member portion in a state where a document pressing device of the image reading device shown in FIGS. 1 to 3 is closed. FIG. 4 is a schematic cross-sectional view showing a restricting member portion provided in the image reading apparatus, where (a) is a view showing a state where a document is not pressed at a portion where the pressing force is not restricted by the restricting member; FIG. 9 is a diagram showing a state where the original is pressed by the elastic member through the contact member at a portion where the pressing force is not restricted by the restricting member, and (c) is a portion where the pressing force is restricted by the restricting member. (D) is a figure which shows the state by which the original is pressed by the elastic member via the contact member in the part by which the pressing force is controlled by the control member. It is the schematic bottom view which looked at the original pressing device concerning Example 1 of this embodiment from the bottom. It is the schematic plan view which looked at the state where the original document pressing device shown in FIG. FIG. 9 is a schematic cross-sectional view illustrating a state in which the document pressing device illustrated in FIG. 7 is separated from the image reading apparatus main body, and (a) is a diagram illustrating a state viewed from the A direction illustrated in FIG. These are figures which show the state seen from the B direction shown in FIG. It is the schematic bottom view which looked at the original pressing device concerning Example 2 of this embodiment from the bottom. It is the schematic plan view which looked at the state where the manuscript pressing device shown in Drawing 10 is pushing a manuscript from the plane. FIG. 11 is a schematic cross-sectional view showing a state in which the document pressing device shown in FIG. 10 is separated from the image reading device main body, and (a) is a view showing a state seen from the direction A shown in FIG. These are figures which show the state seen from the B direction shown in FIG. It is the schematic bottom view which looked at the original pressing device concerning Example 3 of this embodiment from the bottom. It is the schematic plan view which looked at the state where the original document pressing device shown in FIG. FIG. 15 is a schematic cross-sectional view illustrating a state in which the document pressing device illustrated in FIG. 13 is separated from the image reading apparatus main body, and is a diagram illustrating a state viewed from the A direction illustrated in FIG. 14. FIG. 7 is a schematic view showing a state in which the restricting member is a hard protrusion-shaped member and the pressing member is closed in the document pressing device, and FIG. FIG. 5B is a diagram illustrating an example in which the regulating member is provided on a support portion in an outer region of the document placing table, and FIG. It is a figure which shows an example provided in both the non-original press area | region of a member, and the support part in the outer side area | region of a document mounting base. Evaluation of the occurrence state of speckles that can occur in a scanned image of a document due to light wave interference in the gap between the document and the contact glass, and shadows that can occur in the scanned image of the document due to the floating of the document with respect to the contact glass It is a chart which shows a result.

  Embodiments according to the present invention will be described below with reference to the drawings. The following embodiment is an example embodying the present invention, and does not limit the technical scope of the present invention.

  FIG. 1 is a schematic cross-sectional view of an image forming apparatus 400 provided with an image reading apparatus 100 according to an embodiment of the present invention as viewed from the front.

  An image forming apparatus 400 shown in FIG. 1 reads an image of an original G, and records an image of the original G read by the image reading apparatus 100 or an image received from the outside in color or single color on plain paper or the like. An image forming apparatus main body 400d for recording and forming on a sheet is provided, and the image reading apparatus 100 is mounted on the upper surface of the image forming apparatus main body 400d.

[Overall Configuration of Image Forming Apparatus]
The image forming apparatus main body 400d includes an exposure device 1, a developing device 2 (2a, 2b, 2c, 2d), a photosensitive drum 3 (3a, 3b, 3c, 3d) that acts as an image carrier, and a charger 5 (5a, 5d). 5b, 5c, 5d), cleaner device 4 (4a, 4b, 4c, 4d), intermediate transfer belt device 8 including intermediate transfer roller 6 (6a, 6b, 6c, 6d) acting as a transfer portion, fixing device 12, A sheet transport device 50, a paper feed tray 10 that functions as a paper feed unit, and a paper discharge tray 15 that functions as a paper discharge unit are provided.

  The image data handled in the image forming apparatus main body 400d corresponds to a color image using each color of black (K), cyan (C), magenta (M), yellow (Y), or a single color (for example, black). This corresponds to a monochrome image using. Accordingly, the developing device 2 (2a, 2b, 2c, 2d), the photosensitive drum 3 (3a, 3b, 3c, 3d), the charger 5 (5a, 5b, 5c, 5d), and the cleaner device 4 (4a, 4b, 4c, 4d) and four intermediate transfer rollers 6 (6a, 6b, 6c, 6d) are provided so as to form four types of images corresponding to the respective colors. Is associated with black, b with cyan, c with magenta, and d with yellow to form four image stations. Hereinafter, the description will be made with the suffixes a to d omitted.

  The photoconductive drum 3 is disposed substantially at the center in the vertical direction of the image forming apparatus main body 400d. The charger 5 is a charging means for uniformly charging the surface of the photosensitive drum 3 to a predetermined potential, and a charger type charger is used in addition to a contact type roller type or brush type charger. .

  Here, the exposure apparatus 1 is a laser scanning unit including a laser diode and a reflection mirror, and exposes the surface of the charged photosensitive drum 3 in accordance with image data, and electrostatically in accordance with the image data on the surface. A latent image is formed.

  The developing device 2 develops the electrostatic latent image formed on the photosensitive drum 3 with (K, C, M, Y) toner. The cleaner device 4 removes and collects toner remaining on the surface of the photosensitive drum 3 after development and image transfer.

  The intermediate transfer belt device 8 disposed above the photosensitive drum 3 includes an intermediate transfer belt 7, an intermediate transfer belt drive roller 21, a driven roller 22, a tension roller 23, and an intermediate transfer belt cleaning in addition to the intermediate transfer roller 6. A device 9 is provided.

  Roller members such as the intermediate transfer belt drive roller 21, the intermediate transfer roller 6, the driven roller 22, and the tension roller 23 stretch and support the intermediate transfer belt 7, and the intermediate transfer belt 7 is supported in a predetermined sheet conveyance direction (in the drawing). Move around in the direction of the arrow).

  The intermediate transfer roller 6 is rotatably supported inside the intermediate transfer belt 7 and is pressed against the photosensitive drum 3 via the intermediate transfer belt 7.

  The intermediate transfer belt 7 is provided so as to be in contact with each photoconductive drum 3, and a color toner image (each color is transferred by sequentially superimposing and transferring the toner image on the surface of each photoconductive drum 3 onto the intermediate transfer belt 7. Toner image).

  The transfer of the toner image from the photosensitive drum 3 to the intermediate transfer belt 7 is performed by the intermediate transfer roller 6 that is in pressure contact with the inner side (back surface) of the intermediate transfer belt 7. A high voltage transfer bias (for example, a high voltage having a polarity (+) opposite to the toner charging polarity (−)) is applied to the intermediate transfer roller 6 in order to transfer the toner image.

  The image forming apparatus main body 400d further includes a secondary transfer device 11 including a transfer roller 11a that functions as a transfer unit. The transfer roller 11a is in contact with the opposite side (outside) of the intermediate transfer belt 7 from the intermediate transfer belt drive roller 21.

  As described above, the toner images on the surfaces of the photosensitive drums 3 are stacked on the intermediate transfer belt 7 and become a color toner image indicated by the image data. The stacked toner images of the respective colors are transported together with the intermediate transfer belt 7 and transferred onto the recording sheet by the secondary transfer device 11.

  The intermediate transfer belt 7 and the transfer roller 11a of the secondary transfer device 11 are pressed against each other to form a nip region. The transfer roller 11a of the secondary transfer device 11 has a voltage (for example, a polarity (+) opposite to the toner charging polarity (-)) for transferring the toner image of each color on the intermediate transfer belt 7 to the recording sheet. Is applied).

  Further, the secondary transfer device 11 removes and collects the residual toner remaining on the intermediate transfer belt 7 without the toner image being completely transferred onto the recording sheet. The intermediate transfer belt cleaning device 9 includes, for example, a cleaning blade that comes into contact with the intermediate transfer belt 7 as a cleaning member, and residual toner can be removed and collected by the cleaning blade.

  The paper feed tray 10 is a tray for storing recording sheets, and is provided below the image forming unit 110 of the image forming apparatus main body 400d. A paper discharge tray 15 provided on the upper side of the image forming unit 110 is a tray for placing printed recording sheets face down.

  Further, the image forming apparatus main body 400d is provided with a sheet conveying device 50 for sending the recording sheet on the paper feed tray 10 to the paper discharge tray 15 via the secondary transfer device 11 and the fixing device 12. The sheet conveying device 50 has an S-shaped sheet conveying path S, and along the sheet conveying path S, a pickup roller 16, a first separating roller 14a, a second separating roller 14b, each conveying roller 13, and a pre-registration roller Conveying members such as the roller pair 19, the registration roller pair 106, the fixing device 12, and the paper discharge roller 17 are arranged.

  The pickup roller 16 is a draw-in roller that is provided at the downstream end of the sheet feeding tray 10 in the sheet conveying direction and supplies recording sheets from the sheet feeding tray 10 to the sheet conveying path S one by one. The first separation roller 14a passes the recording sheet between the second separation roller 14b and conveys it to the sheet conveyance path S while separating the recording sheets one by one. Each conveyance roller 13 and the pre-registration roller pair 19 are small rollers for promoting and assisting conveyance of the recording sheet. Each conveying roller 13 is provided at a plurality of locations along the sheet conveying path S. The pre-registration roller pair 19 is provided in the immediate vicinity of the registration roller pair 106 on the upstream side in the sheet conveyance direction, and conveys the recording sheet to the registration roller pair 106.

  The fixing device 12 includes a heat roller 31 and a pressure roller 32. The heat roller 31 and the pressure roller 32 sandwich and convey the recording sheet.

  The temperature of the heat roller 31 is controlled so as to be a predetermined fixing temperature, and the recording sheet is thermocompression bonded together with the pressure roller 32 to melt, mix, and press the toner image transferred to the recording sheet. On the other hand, it has a function of heat fixing. The fixing device 12 is provided with an external heating belt 33 for heating the heat roller 31 from the outside.

  The recording sheet after fixing the toner images of the respective colors is discharged onto the paper discharge tray 15 by the paper discharge roller 17.

  It is also possible to form a monochrome image using at least one of the four image forming stations and transfer the monochrome image to the intermediate transfer belt 7 of the intermediate transfer belt device 8. Similarly to the color image, this monochrome image is also transferred from the intermediate transfer belt 7 to the recording sheet and fixed on the recording sheet.

  In addition, when performing image formation on both the front side and the front side of the recording sheet, the image on the surface of the recording sheet is fixed by the fixing device 12, and then the recording sheet is discharged on the sheet conveying path S in the sheet discharge roller 17. In the middle of the conveyance, the paper discharge roller 17 is stopped and then reversely rotated, the recording sheet is passed through the front / back reversing path Sr, the recording sheet is reversed, and the recording sheet is transferred to the registration roller pair 106 again. As in the case of the front surface of the recording sheet, the image is recorded and fixed on the back surface of the recording sheet, and the recording sheet is discharged to the paper discharge tray 15.

  In the image reading apparatus 100 shown in FIG. 1, the reference numerals not described among the reference numerals attached will be described later.

[Overall configuration of image reading apparatus]
FIG. 2 is a schematic plan view of the image reading apparatus 100 mounted on the image forming apparatus 400 shown in FIG. FIG. 3 is a schematic sectional view of the image reading apparatus 100 shown in FIGS. 1 and 2 as viewed from the front. 1 and 3, the illustration of a regulating member 370 described later is omitted.

  As shown in FIGS. 2 and 3, the image reading apparatus 100 is a reduction optical system type image reading apparatus, and uses an original fixing method to provide an original G (for example, in addition to a general normal original, glossiness). The document image is read with the document having an image of a document) fixed. The image reading apparatus 100 includes a plurality of types of prescribed sizes (here, A3 size, B4) placed on the contact glass 201a of the document placement table 201 having the image reading apparatus main body 100d and the contact glass 201a which is an example of a transparent plate. A document pressing device 300 that presses a document G of a size, A4 size, B5 size, A5 size, 2L size, B6 size, A6 size, L size). Here, the 2L size and the L size are sizes mainly used for photographic documents. The 2L size is 127 mm (5 inches) × 178 mm (7 inches), and the L size is 89 mm (3.5 inches) × 127 mm ( 5 inches).

  As shown in FIG. 3, the image reading apparatus main body 100d illuminates the document G placed on the contact glass 201a while moving the light source unit 210 to one side Y1 in the sub-scanning direction Y through the contact glass 201a. The document reading unit 200 reads the document image by scanning the reflected light from the document G illuminated by the light source unit 210 in the main scanning direction X orthogonal to both the sub-scanning direction Y and the vertical direction Z.

  Specifically, the document reading unit 200 includes a contact glass 201a, a light source unit 210 that functions as a scanning body, an optical system driving unit (not shown) that moves the light source unit 210, a mirror unit 203, a condenser lens 204, and photoelectric conversion. An element (CCD in this case) 205 is provided, and these members are accommodated in a metal frame 202. The light source unit 210 includes a light source 211 that irradiates light toward the original G, and a first mirror 230 that guides reflected light from the original G to the mirror unit 203. The light source 211 includes two light emitting element rows 212a and 212b in which a plurality of light emitting elements are arranged in the main scanning direction X, and light source substrates 213a and 213b on which the two light emitting element rows 212a and 212b are respectively mounted.

  The contact glass 201 a on which the document G is placed is made of a transparent glass plate, and both end portions in the main scanning direction X are placed on the frame body 202. The document pressing device 300 includes an opening / closing axis Q1 (see FIG. 7 and the like described later), and is one end side (specifically, relative to the image reading device main body 100d or the image forming device main body 400d (here, the image reading device main body 100d)). The operation side where the operation unit 101 (see FIG. 2) of the image reading apparatus main body 100d is provided, the front side (front side) is the other end side opposite to the one end side (specifically, the operation side is openable and closable). Is supported by an opening / closing axis Q1 on the opposite side and the back side (back side). The document pressing device 300 will be described in detail later with reference to FIGS.

  The mirror unit 203 includes a second mirror 203a, a third mirror 203b, and a support member (not shown). The support member supports the second mirror 203a so that the light from the first mirror 230 in the light source unit 210 is reflected and guided to the third mirror 203b. Further, the support member supports the third mirror 203b so that the light from the second mirror 203a is reflected and guided to the condenser lens 204. The condensing lens 204 condenses the light from the third mirror 203b on the light receiving surface 205d of the photoelectric conversion element 205. The photoelectric conversion element 205 repeatedly scans light (original image light) from the condenser lens 204 in the main scanning direction X, and outputs an analog signal of one scanning line each time.

  Here, the optical system drive unit includes a moving mechanism such as a scanner motor (not shown) and a pulley and a wire (not shown). The scanner motor and the moving mechanism move the light source unit 210 at a constant speed in the sub-scanning direction Y. And the mirror unit 203 is also moved in the sub-scanning direction Y at a movement speed that is ½ of the movement speed of the light source unit 210.

  In the image reading apparatus 100 described above, the light source unit 210 is fixed while irradiating the light from the light source 211 to the original G placed on the contact glass 201a in the original placement table 201 through the contact glass 201a. At the same time, it moves to one side Y1 in the sub-scanning direction Y to scan the image of the original G. At the same time, the mirror unit 203 is also one side in the sub-scanning direction Y at a moving speed that is ½ of the moving speed of the light source unit 210. Move to Y1.

  The reflected light that is illuminated by the light source unit 210 and reflected from the original G is reflected by the first mirror 230 provided in the light source unit 210 and then 180 by the second mirror 203a and the third mirror 203b of the mirror unit 203. ° The optical path is changed. The light reflected from the third mirror 203b forms an image on the light receiving surface 205d of the photoelectric conversion element 205 via the condenser lens 204, where the original image light is read and converted into an analog signal.

  In this embodiment, the image reading apparatus main body 100d includes an automatic document feeder that automatically conveys the document G and also serves as the document pressing device, instead of the document pressing device 300. The original G is moved by the moving method to read the original image. In this case, the image reading apparatus 100 causes the document reading unit 200 to read a document G conveyed to one side Y1 in the sub-scanning direction Y so as to pass over the document reading glass 201b by the automatic document feeder. The original image is read by scanning the light reflected from the original G illuminated by the light source unit 210 in the main scanning direction while illuminating through the original reading glass 201b with the light source unit 210 positioned below the glass 201b. Can do.

[Original Press]
The document pressing device 300 includes a pressing member 360 that covers and holds the document G of a plurality of types of specified sizes (here, A3, B4, A4, B5, A5, 2L, B6, A6, and L). ing. The pressing member 360 includes a document pressing member (specifically, a document pressing plate) 310 and an elastic member 320 that is provided on the document pressing side of the document pressing member 310 and presses the document G having a plurality of types of specified sizes. Yes.

  In the document pressing device 300 shown in FIGS. 2 and 3, the reference numerals not described among the reference numerals attached are described later.

  4 to 16 are schematic views for explaining the document pressing device 300 in the image reading device 100. FIG. 4 to 16, FIG. 4 is a schematic perspective view of the state in which the document pressing device 300 of the image reading apparatus 100 shown in FIGS. In FIG. 4, the position of the regulating member 370 is a position of Example 1 described later. FIG. 5 is a schematic cross-sectional view showing the contact glass 201a, the support portion 340, and the regulating member 370 in a state where the document pressing device 300 of the image reading device 100 shown in FIGS. 1 to 3 is closed. .

  In the document pressing device 300 shown in FIGS. 4 to 16, the document pressing member 310 is a plate-like housing member, and is formed of a resin material such as ABS (Acrylonitrile Butadiene Styrene). The document pressing member 310 supports the elastic member 320 and has a size larger than the maximum size (here, A3 size) of the document G placed on the contact glass 201a. Specifically, the document pressing member 310 includes a document pressing member main body 311 (see FIG. 5 and the like) and a plurality of ribs 312 to 312 (see FIG. 5 and the like) erected from the document pressing member main body 311 on the document pressing side. It has. Each rib 312 to 312 extends along the sub-scanning direction Y, and an elastic member 320 is provided on each rib 312 to 312. The document pressing member main body 311 and the ribs 312 to 312 are integrally formed.

  The document pressing member 310 is pivotally supported by an opening / closing axis Q1 on the back side so that the front side can be opened and closed.

  In the present embodiment, the document pressing device 300 further includes a hinge portion 330 that acts as a rotation support portion that supports the document pressing member 310 so as to be opened and closed.

  The hinge part 330 is a pair of ones provided on one side Y1 and the other side Y2 in the sub-scanning direction Y, and main body side members provided on the heel side (back side) of the image reading apparatus main body 100d, respectively. 331 and a document pressing side member 332 that is provided on the heel side (rear side) of the document pressing member 310 and rotates in the opening / closing direction W (see FIG. 9 and the like) with respect to the main body side member 331.

  The document pressing member 310 is provided in the image reading apparatus main body 100d such that the opening / closing axis Q1 is movable in the vertical direction Z.

  Specifically, the main body side member 331 is provided to be detachable with respect to the image reading apparatus main body 100d. The document pressing side member 332 is pivotally supported by the main body side member 331 so as to be rotatable by an opening / closing axis Q1 along the sub-scanning direction Y. Specifically, the main body side member 331 is a rod-like member that is inserted through an insertion hole 206 (see FIG. 9 and the like) provided in the image reading apparatus main body 100d along the vertical direction Z. The document pressing side member 332 is fixed to the document pressing member 310. The document pressing side member 332 and the document pressing member 310 may be integrally formed.

  The hinge 330 is configured to urge the document pressing member 310 toward the document pressing side by a biasing member such as a coil spring. As a configuration for urging the document pressing member 310 toward the document pressing side, a conventionally known configuration can be used, and detailed description thereof is omitted here.

  In the document pressing device 300 having such a configuration, the main body side member 331 of the document pressing member 310 is inserted into the insertion hole 206 (see FIG. 9 and the like) in the image reading device main body 100d and is mounted on the image reading device main body 100d. As a result, the main body side member 331 rotates with respect to the original pressing side member 332 while being attached to the image reading apparatus main body 100d, so that the original pressing member 310 opens and closes on the front side with respect to the image reading apparatus main body 100d. be able to. Then, the document pressing device 300 applies a pressing member 360 composed of the document pressing member 310 and the elastic member 320 to the contact glass 201 a in the document mounting table 201 by the biasing force of the document pressing member 310 to the document pressing side by the hinge part 330. Can be pressed.

  Further, in the present embodiment, the pressing member 360 is the central portion of the document pressing area α1 (see the hatched portion in FIG. 4) in the direction from the near side to the far side (here, the main scanning direction X in the closed state). Or it is set as the double fold structure which can be bend | folded on the boundary of the approximate center part (here center part C, refer FIG. 4). Here, the document pressing area α1 is an area (specifically, the elastic member 320) that presses the document G of each specified size (specifically, the maximum size among the specified sizes, here, the A3 size).

  Specifically, the pressing member 360 is a central portion or a substantially central portion (here, the central portion in the main scanning direction X in the closed state) of the original pressing member 310 from the near side to the far side of the original pressing region α1. It has a bent structure with the part C) as a boundary. Specifically, the document pressing member 310 includes a first document pressing member 310a (see FIG. 4 and the like) positioned on the back side and a second document pressing member 310b (see FIG. 4 and the like) positioned on the near side. ing. The first document pressing member 310a is provided with a document pressing side member 332 in the hinge portion 330, and is opened and closed on the front side by the hinge portion 330 with respect to the image reading apparatus main body 100d. The second document pressing member 310b can be bent up and down around a rotation axis Q2 (see FIG. 4 and the like) along the sub-scanning direction Y with respect to the front end portion of the first document pressing member 310a. The elastic member 320 is provided on the first document pressing member 310a and the second document pressing member 310b so as to straddle the central portion or the substantially central portion (here, the central portion C) as the center. Note that the bending angle of the second document pressing member 310b with respect to the first document pressing member 310a can be, for example, an angle of about ± 45 °.

  Further, in the present embodiment, the document placing table 201 includes the first side (short side) G1 and the first side along the direction from the near side to the far side of the prescribed size document G placed on the contact glass 201a. A support portion 340 (see FIG. 4 and the like) that supports a second side (long side) G2 (see FIG. 4 and the like) orthogonal to the side G1 (see FIG. 4 and the like), and a frame body 202 (the document placing table 201). And an exterior cover member 380 (see FIG. 4 and the like) that is positioned outside the support portion 340 so as to cover it. The exterior cover member 380 is formed of a resin material such as ABS.

  On the support unit 340, characters (in FIG. 8, etc.) indicating the size of the document G at positions indicating the size of the document G (here, A3, B4, A4, B5, A5, 2L, B6, A6, and L). (See S1). In FIG. 8 and the like, illustration of the size display of the B column is omitted.

  In addition, the support portion 340 is provided with an arrow (see symbol S2 in FIG. 8 and the like) indicating the intersection at a position indicating the intersection of the first side (short side) G1 and the second side (long side) G2. Yes.

  Specifically, the support unit 340 abuts the first side G1 of the document G and contacts one side in the direction along the second side G2, specifically, the other side Y2 in the sub-scanning direction Y (here, document reading start) The first support portion 341 that restricts the movement to the side) and the second side G2 of the document G are brought into contact with each other, and one side in the direction along the first side G1, specifically, the other side in the main scanning direction X And a second support portion 342 that restricts movement to X2 (here, the back side). Thus, the support unit 340 can support the document G on the basis of the other side Y2 in the sub-scanning direction Y (here, the document reading start side) and the other side X2 in the main scanning direction X (here, the back side).

  The first support portion 341 and the second support portion 342 are provided with characters S1 indicating the size of the document G, and the first support portion 341 has a first side (short side) G1 and a second side (long side). Side) An arrow S2 indicating the intersection of G2 is provided.

  In the present embodiment, the first support portion 341 not only regulates the movement of the document G to one side in the direction along the second side G2, but also causes the first side of the contact glass 201a to contact the first side. The second support portion 342 also serves as a support portion that restricts movement to one side in the direction along the second side perpendicular to one side, and the second support portion 342 is directed to one side in the direction along the first side G1 of the document G. In addition to restricting the movement of the contact glass 201a, the second side of the contact glass 201a is brought into contact with the support glass 201a so as to serve as a support part for restricting movement in one direction along the first side. Further, the support portion 340 abuts the third side opposite to the first side of the contact glass 201a and contacts the other side in the direction along the second side, specifically, one side Y1 in the sub-scanning direction Y (here The third support portion 343 that restricts the movement to the document reading end side) and the fourth side opposite to the second side of the contact glass 201a are brought into contact with each other, specifically the other side in the direction along the first side. Is provided with a fourth support portion 344 for restricting movement to one side X1 (here, the front side) in the main scanning direction X.

  In the present embodiment, the document pressing device 300 is a sheet-shaped contact member 350 that contacts the document G placed on the contact glass 201a when the elastic member 320 is pressed against the document G (see FIG. 4 and the like). Is further provided. The contact member 350 is a member having a predetermined color, and is a white member here.

  The contact member 350 is formed of a resin film material such as polypropylene. The elastic member 320 is provided on the document pressing side of the document pressing member 310 (specifically, affixed), and has the same size as the elastic member 320. The thickness of contact member 350 (here, 0.1 mm) is uniform.

  Further, the shape of the document pressing member 310, the elastic member 320, and the contact member 350 is the same rectangular shape (rectangular shape) as the shape of the document G.

  The pressing member 360 includes a document pressing area α1 (see FIG. 4) that presses the document G of a predetermined size, and a non-document pressing area α2 (see the hatched portion in FIG. 4) outside the document pressing area α1. doing. Here, the non-document pressing area α <b> 2 is an area on the inner side (near side) than the portion where the document pressing member 310 is supported by the hinge part 330. The document pressing device 300 further includes a regulating member 370. The regulating member 370 partially applies a pressing force F (see FIG. 9 and the like) to the document G in the document pressing area α1 in the non-document pressing area α2 of the pressing member 360. Are now regulated. Specifically, the restricting member 370 is an outer region outside the document region β1 (see the hatched portion in FIG. 4) corresponding to the non-document pressing region α2 of the pressing member 360 and the document pressing region α1 of the document table 201. (A region that is not involved in the pressing of the pressing member 360 against the document G) An overlapping region (overlapping region) γ (see the shaded portion in FIG. 8) of β2 (see the shaded portion in FIG. 4) of the document pressing region α1 The pressing force F (see FIG. 9 and the like) on the original G is partially restricted.

  Specifically, the regulating member 370 includes an outer region β2 (here, the support portion 340 located in the outer region β2) of the document placing table 201 and a non-document pressing region α2 of the pressing member 360 (here, the elastic member of the document pressing member 310). (Region other than 320).

  FIG. 6 is a schematic cross-sectional view showing a restricting member 370 portion provided in the image reading apparatus 100. FIG. 6A shows a state where the original G is not pressed at a portion where the pressing force F is not restricted by the regulating member 370. FIG. 6B shows a state where the document G is pressed by the elastic member 320 via the contact member 350 at a portion where the pressing force F is not controlled by the regulating member 370. FIG. 6C shows a state where the document G is not pressed at a portion where the pressing force F is restricted by the regulating member 370. FIG. 6D shows a state where the document G is pressed by the elastic member 320 via the contact member 350 at the portion where the pressing force F is controlled by the regulating member 370.

  In the present embodiment, the regulating member 370 is a support piece that partially supports the non-document pressing area α2 of the pressing member 360 (specifically, the overlapping area γ of the non-document pressing area α2 and the outer area β2). Yes. Specifically, the restricting member 370 presses the document pressing region α1 against the document G on the back side (specifically, on the back side of the central portion C) of the non-document pressing region α2 (specifically, the overlapping region γ). F is partially restricted.

  Specifically, the regulating member 370 has a predetermined thickness h1 (see FIGS. 6C and 6D), and is a cube-shaped member here. The restriction member 370 has a length d1 (see FIG. 7) in the vertical direction (main scanning direction X in the closed state) of the restriction member 370 of 20 mm, and a length d2 in the horizontal direction (sub-scanning direction Y) of the restriction member 370. (Refer to FIG. 7) is 20 mm, and the thickness h1 of the restricting member 370 (h1a, see FIG. 6C) is 6.75 mm in an uncompressed state (state in which the document G is not pressed).

  In addition, the distance D (see FIG. 6A) between the upper surface of the contact glass 201a and the upper surface of the support portion 340 is 1.4 mm, and the thickness t (FIG. 6A) of the original (here, the photographic original). The thickness h2 (see h2a, see FIGS. 6A and 6C), which is the sum of the thickness of the elastic member 320 and the thickness of the contact member 350, is not compressed (document G). Is not pressed) and is 8.3 mm.

  The thickness h1 (h1b, see FIG. 6 (d)) of the regulating member 370 is 6.7 mm (in a state where the original G is pressed by the elastic member 320 via the contact member 350). The compression distance is 0.05 mm, and the thickness h2 that is the sum of the thickness of the elastic member 320 and the thickness of the contact member 350 is compressed (the original G is pressed by the elastic member 320 via the contact member 350). In the state), the portion where the pressing force F is not regulated by the regulating member 370 (thickness h2b, see FIG. 6B) is 7.9 mm (compression distance 0.4 mm). The restricted portion (thickness h2c, see FIG. 6 (d)) is 8.1 mm (compression distance 0.2 mm).

  The regulating member 370 may be provided between the exterior cover member 380 and the document pressing member 310.

  The elastic member 320 is a mat-like member, and is formed of a foamed (foamed) foamed resin material such as urethane foam or a porous resin material having a porous shape. Here, as the elastic member 320, urethane foam of F-2 (manufactured by Inoac Corporation) is used. The elastic member 320 is attached to the document pressing side of the document pressing member 310 (specifically, affixed), is smaller than the size of the document pressing member 310, and is placed on the contact glass 201a. The maximum size (here, A3 size) or larger than the maximum size (here, A3 size). The thickness of the elastic member 320 is uniform.

  The regulating member 370 can be formed of a foamed (foamed) foamed resin material such as urethane foam or a porous resin material having a porous shape. Here, as the regulating member 370, urethane foam of L-32 (manufactured by Roger Sinoac Co., Ltd.) is used.

  In the document pressing device 300 according to the present embodiment, the regulating member 370 is provided at a position facing at least two sides (here, two sides) of the document G placed on the contact glass 201a in the document placement table 201. ing. A plurality of regulating members 370 may be provided along the side of the original G.

  The restricting member 370 is provided so as to include a position where the side of the document G having a predetermined size (here, 2L size) faces. That is, the restricting member 370 is provided at a position facing the side of the document G having a predetermined size (here, 2L size). Here, the position facing the side of the original G is an area having a predetermined width m1 (see FIG. 8) from the side of the original G to the outside. In addition, the area | region of the back | inner side of the width | variety m1 is made into the area | region inside the opening-and-closing axis Q1.

  Next, details of the document pressing device 300 (300A to 300C) according to the first to third embodiments of the present embodiment will be described with reference to FIGS.

Example 1
7 to 9 are schematic diagrams for explaining the document pressing device 300 (300A) according to Example 1 of the present embodiment. FIG. 7 is a schematic bottom view of the document pressing device 300 (300A) according to Example 1 of the present embodiment as viewed from the bottom. FIG. 8 is a schematic plan view of a state in which the document pressing device 300 (300A) shown in FIG. FIG. 9 is a schematic cross-sectional view showing a state in which the document pressing device 300 (300A) shown in FIG. 7 is separated from the image reading device main body 100d. FIG. 9A shows a state viewed from the A direction shown in FIG. 8, and FIG. 9B shows a state viewed from the B direction shown in FIG.

  In Example 1 shown in FIGS. 7 to 9, the regulating member 370 has a first regulating member 371 provided on the second side G2 side among positions facing the first side G1, and a position facing the second side G2. The second regulating member 372 provided on the side of the third side G3 facing the first side G1. Here, the second side G2 side is a position closer to the second side G2 than the center in the main scanning direction X. The same applies to Example 2 and Example 3 described later. The third side G3 side is a position closer to the third side G3 than the center in the sub-scanning direction Y.

  In the example shown in FIGS. 7 to 9, the first restriction member 371 and the second restriction member 372 are provided on the document pressing member 310 so as to be positioned on the upper surfaces of the first support part 341 and the second support part 342, respectively. However, the first restricting member 371 may be provided at a position outside the first support portion 341 (specifically, so as to be located on the upper surface of the exterior cover member 380). The regulating member 372 may be provided at a position outside the second support portion 342 (specifically, located on the upper surface of the exterior cover member 380).

(Example 2)
FIGS. 10 to 12 are schematic diagrams for explaining the document pressing device 300 (300B) according to Example 2 of the present embodiment. FIG. 10 is a schematic bottom view of the document pressing device 300 (300B) according to Example 2 of the present embodiment as viewed from the bottom. FIG. 11 is a schematic plan view of a state in which the document pressing device 300 (300B) shown in FIG. 12 is a schematic cross-sectional view showing a state in which the document pressing device 300 (300B) shown in FIG. 10 is separated from the image reading apparatus main body 100d. 12A shows a state viewed from the A direction shown in FIG. 11, and FIG. 12B shows a state viewed from the B direction shown in FIG.

  In Example 2 shown in FIGS. 10 to 12, the regulating member 370 includes a third regulating member 373 provided on the second side G2 side of the position facing the third side G3 facing the first side G1, Among the positions facing the second side G2, a fourth regulating member 374 provided on the first side G1 side is provided. Here, the first side G1 side is a position closer to the first side G1 than the center in the sub-scanning direction Y.

  10 to 12, the third restriction member 373 and the fourth restriction member 374 are provided on the document pressing member 310 so as to be positioned on the upper surfaces of the third support portion 343 and the second support portion 342, respectively. However, the third restricting member 373 may be provided at a position outside the third support portion 343 (specifically, so as to be located on the upper surface of the exterior cover member 380). The regulating member 374 may be provided at a position outside the second support portion 342 (specifically, so as to be located on the upper surface of the exterior cover member 380).

(Example 3)
FIGS. 13 to 15 are schematic diagrams for explaining the document pressing device 300 (300C) according to Example 3 of the present embodiment. FIG. 13 is a schematic bottom view of the document pressing device 300 (300C) according to Example 3 of the present embodiment as viewed from the bottom. FIG. 14 is a schematic plan view of a state in which the document pressing device 300 (300C) shown in FIG. 15 is a schematic cross-sectional view showing a state in which the document pressing device 300 (300C) shown in FIG. 13 is separated from the image reading device main body 100d. FIG. 15 is viewed from the A direction shown in FIG. Indicates the state.

  In Example 3 shown in FIGS. 13 to 15, the regulating member 370 is opposed to the first regulating member 371 provided on the second side G2 side of the position facing the first side G1 and the first side G1. A third regulating member 373 provided on the second side G2 side of the position facing the third side G3 is provided.

  In the example shown in FIGS. 13 to 15, the first restriction member 371 and the third restriction member 373 are provided on the document pressing member 310 so as to be positioned on the upper surfaces of the first support portion 341 and the third support portion 343, respectively. However, the first restriction member 371 may be provided at a position outside the first support portion 341 (specifically, located on the upper surface of the exterior cover member 380), or the third restriction member 373 may be provided at a position outside the third support portion 343 (specifically, so as to be positioned on the upper surface of the exterior cover member 380).

(Configuration common to Examples 1 to 3)
In Examples 1 to 3 of this embodiment, the restriction member 370 (the first restriction member 371, the second restriction member 372, the third restriction member 373, and the fourth restriction member 374) has a higher density than the elastic member 320. Alternatively, the physical properties are high in hardness.

  Specifically, examples of the physical property values include the expansion ratio of the foamed resin material in addition to the density and hardness. Here, as a hardness, the value of Asker C (ASKER C) which shows the hardness prescribed | regulated to the Japan Rubber Association standard (SRIS0101) can be illustrated. The expansion ratio can be the ratio of the volume after foaming to the volume before foaming of the foamable material.

And at least one of the hardness and density of the regulating member 370 (371-374) can be made larger than the physical property value of the elastic member 320 corresponding to it. Alternatively / further, the expansion ratio of the elastic member 320 can be made smaller than the expansion ratio of the regulating member 370 (371 to 374). For example, the density of the elastic member 320 and ^{23kg / m 3 ~27kg / m 3} , the density of the regulating member 370 (371 to 374) may be 320 kg / m ^3.

  In the first to third embodiments, the regulating member 370 (371 to 374) may be attached to at least one of the outer region β2 of the document table 201 and the non-document pressing region α2 of the pressing member 360. Further, the regulating member 370 (371 to 374) may be formed integrally with at least one of the outer region β2 of the document placing table and the non-document pressing region α2 of the pressing member 360. Specifically, the regulating member 370 (371 to 374) may be bonded to the document pressing member 310 via an adhesive member (for example, an adhesive or a double-sided pressure-sensitive adhesive sheet). The member 370 (371-374) may be integrally formed. Alternatively / further, the regulating member 370 (371 to 374) is an adhesive member (for example, an adhesive or a double-sided pressure-sensitive adhesive sheet) with respect to members constituting the outer region β2 of the document placing table 201 such as the support portion 340 and the exterior cover member 380. The members constituting the outer region β2 of the document placing table 201 such as the support portion 340 and the exterior cover member 380 and the regulating member 370 (371 to 374) may be integrally formed. .

(About this embodiment)
As described above, according to the present embodiment, the regulation member 370 (the first regulation member 371, the second regulation member 372, the third regulation member 373, and the fourth regulation member 374) allows each prescribed size (specifically, Indicates a document pressing area α1 for pressing a document G (for example, a glossy document such as a photographic document) of the maximum size among the prescribed sizes, here, A3 size, and non-document pressing outside the document pressing area α1. The document in the document pressing area α1 in the non-document pressing area α2 of the pressing member 360 having the area α2 (specifically, the non-document pressing area α2 of the pressing member 360 and the overlapping area γ of the outside area β2 of the document table 201). The pressing force F to G can be partially restricted (reduced). Therefore, the pressing force of the pressing member 360 in the original pressing area α1 can be made appropriate for both the portion restricted by the restricting member 370 and the portion not restricted, and thereby the original G and the contact glass. Effectively prevents both speckles that may occur in the read image of the original G due to interference of light waves in the gap with the 201a and shadows that may occur in the read image of the original G due to the floating of the original G against the contact glass 201a. can do. In addition, the original pressing area α1 can be an area where the original G having the maximum size (here, A3 size) is pressed out of the prescribed sizes, and thereby a predetermined size (here, A3 size) smaller than the maximum size (here, A3 size). Can be applied to a document G having a maximum size (here, A3 size). These are particularly effective when the original G is a glossy original such as a photo original (for example, a glossy paper original).

  Further, in the present embodiment, the regulating member 370 includes the outer region β2 (here, the support portion 340) of the document placing table 201 and the non-document pressing region α2 of the pressing member 360 (here, other than the elastic member 320 of the document pressing member 310). Between the outer region β2 of the document placing table 201 and the non-original pressing of the pressing member 360, and the non-document pressing region α2 of the pressing member 360. The space between the region α2 and the region α2 can be partially ensured, and thereby the partial restriction of the pressing force F in the document pressing region α1 (here, the elastic member 320) of the pressing member 360 is surely performed. Can do.

  By the way, when the pressing member 360 is configured to be pivotally supported by the opening / closing shaft Q1 on the back side so that the front side can be opened and closed as in the present embodiment, the pressing member 360 has a pressing force on the back side of the document pressing region α1. F tends to increase.

  In this regard, in the present embodiment, even if the pressing member 360 is configured to be pivotally supported by the opening / closing axis Q1 on the back side so that the front side can be opened and closed, the regulating member 370 has a non-document pressing area α2 (specifically Specifically, by partially restricting the pressing force F of the document pressing region α1 to the document G on the back side of the overlapping region γ) of the non-document pressing region α2 and the outer region β2, the back side of the document pressing region α1 is controlled. The pressing force F, which tends to increase, can be reliably regulated (weakened) on the back side, and both spots and shadows can be effectively prevented.

  Further, as in the present embodiment, the pressing member 360 has a double-folded structure that can be folded at the central portion or the substantially central portion (here, the central portion C) of the document pressing region α1. In this case, the pressing force F in the document pressing area α1 tends to be larger on the back side than on the near side.

  In this regard, in the present embodiment, the pressing member 360 has a double-folded structure that can be folded at the central portion or the substantially central portion (here, the central portion C) of the document pressing region α1. However, the restricting member 370 partially restricts the pressing force F applied to the document G in the document pressing region α1 on the back side of the non-document pressing region α2 (specifically, the overlapping region γ), so that The pressing force F in the document pressing area α1 that tends to increase on the back side can be reliably regulated (weakened) on the back side, and both spots and shadows can be effectively prevented.

  Further, when the opening / closing axis Q1 is movable in the vertical direction Z as in the present embodiment, the pressing member 360 has a pressing force F in the document pressing area α1 on the far side rather than the near side. Easy to grow.

  In this regard, in the present embodiment, the pressing member 360 has a non-document pressing area α2 (specifically, an overlapping area γ) even if the opening / closing axis Q1 is movable in the vertical direction Z. By partially restricting the pressing force F on the document G in the document pressing area α1 on the back side of the document, the pressing force F in the document pressing area α1 that tends to be larger on the back side than on the near side can be reliably ensured on the back side. It can be regulated (weakened), and both spots and shadows can be effectively prevented.

  In the present embodiment, the regulating member 370 is provided at a position facing at least two sides of the document G placed on the contact glass 201a, so that the pressing force in the document pressing region α1 of the pressing member 360 is increased. F can be partially restricted on the back side of at least two sides of the document G, whereby the partial restriction of the pressing force F in the document pressing area α1 (here, the elastic member 320) of the pressing member 360. Can be performed stably.

  Specifically, in the first embodiment, the first regulating member 371 is provided on the second side G2 side among the positions facing the first side G1, and the third among the positions where the second regulating member 372 faces the second side G2. Since it is provided on the side of the side G3, the pressing force F in the document pressing area α1 (here, the elastic member 320) of the pressing member 360 is set to the second of the positions facing the first side G1 by the first regulating member 371. In addition to being partially restricted on the side G2 side, the second regulating member 372 can be partially regulated on the third side G3 side among the positions facing the second side G2, and the pressing member 360 can be restricted to that extent. Partial restriction of the pressing force F in the document pressing area α1 can be performed stably.

  In the second embodiment, the third regulating member 373 is provided on the second side G2 side among the positions facing the third side G3, and the first side among the positions where the fourth regulating member 374 faces the second side G2. Since it is provided on the G1 side, the first side of the positions where the pressing force F in the document pressing area α1 (here, the elastic member 320) of the pressing member 360 faces the second side G2 by the fourth regulating member 374. In addition to being partially restricted on the G1 side, the third restricting member 373 can be partially restricted on the second side G2 side of the position facing the third side G3, and the original of the pressing member 360 can be increased accordingly. Partial restriction of the pressing force F in the pressing region α1 can be performed stably.

  Moreover, in Example 3, it is provided in the 2nd edge | side G2 side among the positions where the 1st control member 371 faces the 1st edge | side G1, and the 2nd edge | side among the positions where the 3rd restriction member 373 faces the 3rd edge | side G3. Since it is provided on the G2 side, the pressing force F in the document pressing region α1 (here, the elastic member 320) of the pressing member 360 is set to the second side of the positions facing the first side G1 by the first regulating member 371. In addition to being partially restricted on the G2 side, the third restricting member 373 can be partially restricted on the second side G2 side of the position facing the third side G3, and the original of the pressing member 360 can be increased accordingly. Partial restriction of the pressing force F in the pressing region α1 can be performed stably.

  Incidentally, a document G (especially a glossy document such as a photographic document) placed on the contact glass 201a of the document placement table 201 is generally larger than a maximum size (A3 size in this case) among specified sizes. The frequency of small originals is high.

  In this regard, in the present embodiment, the restriction member 370 is provided so as to include a position facing a side of a document of a predetermined size (for example, 2L size), so that the document pressing region α1 (here, elastic) of the pressing member 360. The pressing force F on the member 320) can be partially restricted by the regulating member 370 on the side of the side of the document G having a predetermined size (for example, 2L size), whereby the document pressing region α1 of the pressing member 360 can be controlled. Of these, partial restriction of the pressing force F in an area where a document G having a predetermined size (for example, 2L size) is pressed can be reliably performed.

  Here, at least one of the outer region β2 (here, the support portion 340) of the document table 201 and the non-document pressing region α2 of the pressing member 360 (here, the region other than the elastic member 320 of the document pressing member 310) is a restricting member. 370 may be provided. That is, when the restricting member 370 is provided only in the non-document pressing region α2 of the pressing member 360, when the restricting member 370 is provided only in the outer region β2 of the document placing table 201, and the outer region β2 and the pressing member of the document placing table 201. A case where the restricting member 370 is provided in both of the 360 non-document pressing areas α2 can be illustrated. When the restricting member 370 is provided only in the non-document pressing area α2 of the pressing member 360, when the pressing member 360 is closed, the restricting member 370 provided in the non-document pressing area α2 is disposed in the outer area of the document placing table 201. It can be brought into contact with β2. When the restriction member 370 is provided only in the outer region β2 of the document table 201, when the pressing member 360 is closed, the restriction member 370 provided in the outer region β2 is used as the non-document pressing region α2 of the pressing member 360. It can be made to contact. Further, when the regulating member 370 is provided in both the non-document pressing area α2 of the pressing member 360 and the outer area β2 of the document placing table 201, the restriction member 370 is provided in the non-document pressing area α2 when the pressing member 360 is closed. The regulating member 370 and the regulating member 370 provided in the outer region β2 can be brought into contact with each other.

  Here, the regulating member 370 includes at least one of the outer region β2 (here, the support portion 340) of the document placing table 201 and the non-document pressing region α2 (here, the region other than the elastic member 320 of the document pressing member 310) of the pressing member 360. In the case where it is provided in the outer region β2 of the document placing table 201, the regulating member 370 may become an obstacle when an operator such as a user places the document G on the contact glass 201a of the document placing table 201. , Causing inconvenience such as peeling or breakage.

  In this regard, as in the present embodiment, the regulating member 370 includes the outer region β2 (here, the support portion 340) of the document table 201 and the non-document pressing region α2 of the pressing member 360 (here, the elastic member of the document pressing member 310). In the area other than 320), the restriction member is provided when an operator such as a user places the document G on the contact glass 201a of the document placement table. It is possible to suppress the occurrence of inconvenience such as 370 getting in the way, peeling off, or being damaged.

  Further, in the present embodiment, since the regulating member 370 is an elastic member, when the pressing member 360 is closed, damage to the counterpart side (here, the support portion 340) of the regulating member 370 is prevented. Can be suppressed.

  By the way, if the density of the regulating member 370 is equal to or smaller than the density of the elastic member 320, or the hardness is equal to or smaller than the hardness of the elastic member 320, the original pressing area α1 of the elastic member 320 will be described. It is difficult to partially restrict the pressing force F at

  In this regard, as in the present embodiment, the restricting member 370 has a physical property value that is higher in density or higher in hardness than the elastic member 320, so that the pressing force of the elastic member 320 in the document pressing region α <b> 1. The partial restriction of F can be performed reliably.

  In the present embodiment, the restricting member 370 may be a protrusion-like member having rigidity (for example, a hard resin member). In this case, the regulating member 370 can be formed of a member similar to the exterior cover member 380 and the document pressing member 310, for example, a resin material such as ABS.

  FIG. 16 is a schematic view showing a state in which the regulating member 370 is a hard protrusion-shaped member and the pressing member 360 is closed in the document pressing device 300 (300A to 300C). FIG. 16A shows an example in which the regulating member 370 is provided in the non-document pressing area α2 of the document pressing member 310. FIG. 16B shows an example in which the regulating member 370 is provided on the support portion 340 in the outer region β <b> 2 of the document table 201. FIG. 16C shows an example in which the regulating member 370 is provided in both the non-document pressing area α2 of the document pressing member 310 and the support portion 340 in the outer area β2 of the document placing table 201.

  As shown in FIG. 16 (a) to FIG. 16 (c), the restricting member 370 is a projection-like member having rigidity, so that the restricting member 370 is made as small as possible. The partial restriction of the pressing force F in the document pressing area α1 of the document pressing member 310 can be reliably performed. Further, the regulating member 370 and at least one of the non-document pressing area α2 of the document pressing member 310 and the support portion 340 in the outer area β2 of the document placing table 201 can be easily formed integrally. In the example shown in FIG. 16, the shape at the tip of the regulating member 370 is a planar shape, but a space between the outer region β2 of the document table 201 and the non-document pressing region α2 of the document pressing member 310 is ensured. Any shape may be used as long as it can be performed, for example, a convex curved surface shape may be used.

  In the present embodiment, the configuration of the centimeter specification is described, but of course, the configuration of the inch specification may be used.

[Evaluation of spots and shadows]
Next, in Examples 1 to 3 of the present embodiment, spots that may occur in the read image of the original G due to light wave interference in the gap between the original G and the contact glass 201a, and the original G with respect to the contact glass 201a Since the state of occurrence of shadows (fogging) that may occur in the read image of the original G due to the floating of the image is examined, the following description will be made together with a comparative example in which the regulating member 370 is not provided.

  FIG. 17 shows spots that may occur in the read image of the original G due to interference of light waves in the gap between the original G and the contact glass 201a, and the read image of the original G due to the floating of the original G with respect to the contact glass 201a. It is a graph which shows the evaluation result of the generation | occurrence | production state of the shadow (fogging) to obtain. In FIG. 17, “◎” indicates that a sufficiently acceptable read image is obtained, “◯” indicates that an acceptable read image is obtained, and “×” indicates that This indicates that the read image is unacceptable.

  The spots and shadows (fogging) evaluation in Examples 1 to 3 and Comparative Example of the present embodiment are all based on an image read in a photographic mode using a white photographic paper having a thickness of 0.2 mm as the original G. This was done by confirming the printed image printed on.

  As shown in FIG. 17, in the comparative example, both the speckles and the shadows (fogging) are unacceptable read images, whereas in Examples 1 to 3 of the present embodiment, the speckles and the shadows (fogging). In both cases, the read image was sufficiently acceptable or acceptable.

100 Image Reading Device 201 Document Placement Table 201a Contact Glass (Example of Transparent Plate)
300 Document pressing device 310 Document pressing member 320 Elastic member 330 Hinge portion 340 Support portion 341 First support portion 342 Second support portion 350 Contact member 360 Press member 370 Restriction member 371 First restriction member 372 Second restriction member 373 Third restriction Member 374 fourth regulating member 400 image forming apparatus C central portion F pressing force G document G1 first side G2 second side G3 third side Q1 opening / closing axis Q2 rotation axis S1 character S2 arrow X main scanning direction Y sub-scanning direction Z Vertical direction α1 Document pressing area α2 Non-document pressing area β1 Document area β2 Outside area γ Overlapping area

Claims (10)

An image reading apparatus including an image reading unit including an original document placement table made of a transparent member for placing an original document, and an original document pressing unit configured to press the original document placed on the original document placement table,
A rotation support part that supports the image reading part so that the document pressing part can be opened and closed on one end side,
The image reading unit includes a first non-document placement region that is directed from the document placement table toward the rotation support unit and is orthogonal to the first non-document placement region on the outside of the document placement table. A second non-document placing area is provided,
The document pressing portion supports the document pressing portion while partially contacting the first non-document placing area and the second non-document placing area when the document pressing section is closed. An image reading apparatus comprising a supporting piece for performing the above operation. The image reading apparatus according to claim 1,
The image reading apparatus according to claim 1, wherein the support piece is provided so as to come into contact with a support region that supports the document table when the document pressing portion is closed. The image reading apparatus according to claim 1 or 2,
One or a plurality of the support pieces are provided in each of the area corresponding to the first non-document placement area and the area corresponding to the second non-document placement area in the document pressing portion. An image reading apparatus. The image reading apparatus according to claim 3,
The second non-document placement area is a pair of second non-document placement areas on one side and the other side with the document placement table in the rotation axis direction of the rotation support portion,
The image reading apparatus according to claim 1, wherein one or a plurality of the support pieces are provided in areas corresponding to the pair of second non-document placement areas of the document pressing portion. The image reading apparatus according to claim 4,
Each of the support pieces provided in a region corresponding to the pair of second non-document placement regions of the document pressing unit is at the same position or substantially in the direction orthogonal to the rotation axis direction of the rotation support unit. An image reading apparatus provided at the same position. An image reading apparatus according to any one of claims 1 to 5,
The image reading apparatus according to claim 1, wherein the support piece is provided outside the rotation support portion in the rotation axis direction of the rotation support portion in the document pressing portion. An image reading apparatus according to any one of claims 1 to 6,
The image reading apparatus, wherein the rotation support unit is supported so as to be movable in the vertical direction with respect to the image reading unit. An image reading apparatus according to any one of claims 1 to 7,
An elastic member that is provided in the document pressing portion and presses the document;
The image reading apparatus according to claim 1, wherein the support piece is a protrusion-like member having rigidity. An image reading apparatus according to any one of claims 1 to 8,
The image reading apparatus, wherein the first non-document placement area and the second non-document placement area are provided around the document placement table in the image reading section.   An image forming apparatus comprising the image reading apparatus according to claim 1.

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