Image reading device and image forming apparatus

Abstract

To prevent static electricity from entering from a gap between a transparent member and a case of a reading part.SOLUTION: An image reading device comprises: a conveying part that conveys a document through a lower conveyance path 11b; and a second reading unit 307 that reads an image of the document conveyed through the lower conveyance path 11b. The second reading unit 307 has a CIS 311 that reads the image of the document, a first case member 400 that accommodates the CIS 311 and has an edge 402a forming an opening 402 causing an optical path of the CIS 311 to pass toward the lower conveyance path 11b, a second skim reading glass 313 that is attached to the first case member 400 and closes the opening 402, and a glass grounding sheet 1400 that is pasted to the second skim reading glass 313, has conductivity, and is grounded.SELECTED DRAWING: Figure 4

Description

[Technical field]

[0001] The present invention relates to an image reading device that reads an image from a document, and an image forming apparatus to which the image reading device is applied. [Background technology]

[0002] Conventionally, image reading devices mounted on image forming devices such as copiers and printers are widely used that are equipped with an automatic document feeder that separates and feeds documents (hereinafter also referred to as sheets) placed on a document tray one by one as a sheet conveying device. As such an image reading device, a device has been developed that is equipped with a second reading unit on the automatic document feeder side in addition to a first reading unit on the reader side having a glass on which the document is placed (see Patent Document 1). With such a configuration, it is possible to realize a function called one-pass double-sided scanning that can read image information on both sides of a double-sided document without reversing the document, and it is possible to increase the productivity of reading double-sided documents.

[0003] The second reading unit has a case, a reading element such as a CIS attached to the case, and a transparent member such as a glass plate that closes the opening of the case. The glass plate is attached to the case with double-sided tape or adhesive. Here, in the vicinity of the second reading unit, there are cases where jam processing or cleaning work of dirt attached to the running reading glass is performed. For this reason, in the image reading device, a configuration that allows the second reading unit to be opened by opening a cover may be adopted. Specifically, for example, there is a configuration in which a user can open the cover and rotate the second reading unit to open the lower conveying path. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2018-125752 A Summary of the Invention [Problem to be solved by the invention]

[0005] In a configuration where the user can access the glass plate provided in the second reading unit, there is a risk that static electricity will jump from the user's fingertips onto the glass plate. Even if the user does not have access to the glass plate, when a document is transported, the document itself may become charged during transport, causing static electricity to jump from the document to the glass plate.

[0006] However, in the image reading device described in the above-mentioned Patent Document 1, the glass plate is attached to the case with double-sided tape or adhesive. Therefore, a small gap is generated between the glass plate and the case, and static electricity from the user's fingertip or the document may fly through the gap to electrical components such as LEDs provided inside the second reading unit. When double-sided tape is used as a means for attaching the glass plate, even if it appears to be attached in close contact with the double-sided tape, the double-sided tape is electrically the same as an air layer, so there is a risk that static electricity may enter the inside of the second reading unit through the double-sided tape. This is the same even if the glass plate is mechanically attached to the case with a claw structure or the like. As a result, there is a risk that the electrical components constituting the image reading device may break down.

[0007] An object of the present invention is to provide an image reading device and an image forming device that are capable of preventing static electricity from entering through a gap between a transparent member of a reading unit and a case. [Means for solving the problem]

[0008] One aspect of the present invention is an image reading device comprising a transport unit that transports a document along a transport path, and a reading unit that reads an image of the document transported along the transport path, wherein the reading unit comprises a reading element that reads the image of the document, a housing that houses the reading element and has an opening forming portion that forms an opening through which the optical path of the reading element passes toward the transport path, a transparent member attached to the housing and closing the opening, and a shielding member that is affixed to the transparent member and is conductive and grounded.

[0009] One aspect of the present invention is an image forming apparatus including the image reading device described above, and an image forming section that forms an image read by the image reading device on a sheet. Effect of the Invention

[0010] According to the present invention, it is possible to prevent static electricity from entering through the gap between the transparent member of the reading unit and the case. [Brief description of the drawings]

[0011] [Figure 1] 1 is a schematic diagram showing an image forming apparatus according to an embodiment of the present invention. [Diagram 2] FIG. 1 is a perspective view showing an image reading device according to an embodiment of the present invention. [Diagram 3] FIG. 1 is a cross-sectional view showing an image reading device according to an embodiment of the present invention. [Figure 4] FIG. 4 is a cross-sectional view of a second reading unit according to the embodiment. [Diagram 5] FIG. 4 is a front view showing a state in which the second reading unit and the inner cover are in a closed position according to the embodiment. [Figure 6] FIG. 4 is a front view of the inner cover according to the embodiment in a rotated state. [Figure 7] FIG. 11 is a front view showing a state in which the inner cover according to the embodiment is pushing up the second reading unit. [Figure 8] FIG. 4 is a front view showing a state in which the second reading unit and the inner cover according to the embodiment are in an open position. [Figure 9] FIG. 2 is a perspective view showing a second reading unit and an FFC according to the embodiment. [Figure 10] 1 is a perspective view showing a position of an FFC exposed portion inside the ADF according to the embodiment. FIG. [Figure 11] FIG. 2 is a perspective view showing the arrangement of an FFC grounding sheet inside the ADF according to the embodiment. [Figure 12] FIG. 2 is a cross-sectional view showing the arrangement of the FFC earth sheet according to the embodiment. [Figure 13] 1 is a perspective view showing the arrangement of the FFC grounding sheet in the second reading unit according to the embodiment. FIG. [Figure 14] FIG. 4 is an exploded perspective view showing a second reading unit according to the embodiment. [Figure 15] FIG. 2 is an exploded perspective view showing the glass earth sheet according to the embodiment. [Figure 16] FIG. 11 is a perspective view showing a glass earth sheet according to a modified example of the embodiment. [Figure 17] FIG. 11 is a perspective view showing a glass earth sheet according to another modified example of the embodiment. [Figure 18] FIG. 2 is a perspective view showing the FFC cover member according to the embodiment. [Figure 19] FIG. [Figure 20] FIG. 4 is an exploded perspective view showing a separation guide member and a cam member according to the embodiment. [Figure 21] FIG. 4 is an exploded perspective view showing a front side plate and a separation guide member according to the embodiment. [Figure 22] FIG. 4 is a front view showing the rotation restricting means and the first convex portion in the closed state according to the embodiment. [Figure 23] FIG. 4 is a front view showing the rotation restricting means and the first convex portion in the open position according to the embodiment. [Figure 24] FIG. 11 is a front view showing a rotation restricting means according to a modified example of the embodiment. [Diagram 25] 1A and 1B are plan views showing the arrangement of LEDs in a CIS according to the present embodiment, where (a) is an LED array and (b) is an edge LED. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0012] Hereinafter, this embodiment will be described with reference to Figs. 1 to 25. First, a schematic configuration of an image forming apparatus according to this embodiment will be described with reference to Fig. 1. Fig. 1 is a cross-sectional view showing an image forming apparatus 1 according to this embodiment. Note that this embodiment is applied to a full-color copying machine having a plurality of photosensitive drums. However, the present invention is not limited to this, and can also be applied to a monochrome or mono-color copying machine or printer having one photosensitive drum, or an inkjet printer.

[0013] [Image forming device] The image forming apparatus 1 will be described with reference to FIG. 1. The image forming apparatus 1 is configured to include an image reading device 10 above an image forming apparatus main body 2. The image forming apparatus 1 conveys a sheet P conveyed from a sheet cassette 105 to an image forming unit 106, and forms a toner image on the sheet P. The image forming apparatus 1 conveys the sheet P on which the toner image has been formed in the image forming unit 106 to a fixing device 107, and fixes the unfixed toner on the sheet P to the sheet P by applying heat and pressure. That is, the image forming unit 106 forms an image read by the image reading device 10 on a sheet. The sheet P includes paper such as thin paper and thick paper, plastic film such as an overhead projector sheet (OHP), surface-treated paper such as coated paper, sheets of special shapes such as envelopes, and cloth.

[0014] The image forming unit 106 includes stations 111, 112, 113, and 114. The image forming apparatus 1 includes an intermediate transfer belt 115 and a secondary outer transfer roller 116. The stations 111, 112, 113, and 114 form yellow, magenta, cyan, and black toner images on the intermediate transfer belt 115, respectively. The configurations of the stations 111, 112, 113, and 114 are common to each other except for the different toner colors. The toner images formed by the stations 111, 112, 113, and 114 are transferred onto the intermediate transfer belt 115. The secondary outer transfer roller 116 transfers the toner image on the intermediate transfer belt 115 onto the sheet P conveyed from the sheet cassette 105. The fixing device 107 applies heat and pressure to the sheet P to fix the toner image transferred onto the sheet P to the sheet P. The sheet P on which the toner image has been fixed is discharged to a discharge tray 119.

[0015] [Image reader] FIG. 2 is a perspective view showing the image reading device 10. As shown in FIG. 2, the image reading device 10 has a reader 103 for reading an image of a document set by a user and an ADF 102 (Auto Document Feeder) above the image forming apparatus main body 2. FIG. 3 is a cross-sectional view showing the image reading device 10. As shown in FIG. 3, in the ADF 102, a plurality of documents set in a document tray 200 are transported into the inside, so that the document images can be read by a first reading unit 306 and a second reading unit 307 mounted therein. Specifically, the document placed on the document tray 200 is transported through the transport path 11 by the transport section 14. The transport section 14 has a feed roller 300, a transport roller 301, a transport roller 302, a transport roller 303, a transport roller 304, a discharge roller 305, and a guide member forming the transport path 11.

[0016] Image information of the first side of the document is read by a first reading unit 306 mounted inside the reader 103 through a first flow reading glass 312. Furthermore, the document is transported by transport rollers 304, and image information of the second side opposite to the first side is read by a second reading unit 307 mounted inside the ADF 102 through a second flow reading glass 313. The second reading unit 307 reads the image of the document at a position fixed relatively to the transport section 14. The document after reading is discharged to the discharge tray 201 by discharge rollers 305. The reader 103 also has a document table glass 104, and by opening and closing the ADF 102, the image of the document placed on the document table glass 104 can be read by moving and scanning the first reading unit 306 in the sub-scanning direction.

[0017] In this embodiment, the ADF 102 has an outer cover 12 which is an example of a first cover, a transport guide member 507, a separation guide member 500, a second reading unit 307, and a reading guide member 403 which is an example of a third unit. The outer cover 12 can be opened and closed between a first closed position in which an upper transport path 11a which is an example of a first region of the transport path 11 is formed between the transport guide member 507 and the second reading unit 307, and a first open position in which the upper transport path 11a is opened. In this embodiment, the outer cover 12 forms the upper transport path 11a between the transport guide member 507 and the separation guide member 500 in the first closed position. The reading guide member 403 is disposed on the opposite side of the second reading unit 307 from the separation guide member 500, and forms a lower transport path 11b which is continuous with the upper transport path 11a of the transport path 11 between the second reading unit 307 and the second reading unit 307.

[0018] [Second reading unit] FIG. 4 is a cross-sectional view of the second reading unit 307. As shown in FIG. 4, the second reading unit 307 is an example of a reading unit and a second reading unit, and includes a first case member 400 and a second case member 401, which are an example of a housing, a CIS 311, which is a contact type image sensor, and a second running reading glass 313. The second reading unit 307 moves relative to the transport guide member 507 (see FIGS. 5 to 8) by rotation and linear movement. In this embodiment, the second reading unit 307 moves relative to the transport guide member 507 by rotation and linear movement, but is not limited thereto, and may move only by rotation, only by linear movement, or other relative movement. The CIS 311 is an example of a reading element that reads an image of a document, and is housed in the first case member 400 and the second case member 401. The CIS 311 is connected to an FFC 9, which will be described later, and reads an image of a sheet transported on a lower transport path 11b of the transport path 11.

[0019] An opening 402, which is an example of an opening, is provided on the transport path side of the first case member 400 in order to read the transported image information. That is, the first case member 400 has an edge portion 402a, which is an example of an opening forming portion that forms the opening 402 that passes the optical path of the CIS 311 toward the lower transport path 11b. The second running reading glass 313 is attached to the edge portion 402a so as to cover the opening 402. That is, the second running reading glass 313 is an example of a transparent member, and is attached to the first case member 400 to close the opening 402. On the other hand, a reading guide member 403 is disposed on the outer side of the second running reading glass 313, i.e., on the transport path side, as a transport guide member. The reading guide member 403 has a white sheet 405 and a protective glass 404 for the white sheet 405 provided so as to face the CIS 311. The white sheet 405 is provided to perform shading correction of the CIS 311 before reading the image information of the original, and the protective glass 404 is provided to prevent the surface of the white sheet 405 from being scratched by the transported original.

[0020] Next, the manner in which the second reading unit 307 rotates inside the ADF 102 of this embodiment will be described with reference to Figs. 5 to 8. Figs. 5 to 8 are front views showing the rotational configuration of the second reading unit 307 of this embodiment. As shown in Fig. 5, inside the ADF 102, a transport guide is configured by a separation guide member 500, a transport guide member 507, a reading guide member 403, and the like. The separation guide member 500 is an example of a second cover, and forms a transport guide on one side of the feeding and separation section. That is, the separation guide member 500 is disposed on the upper transport path 11a side of the second reading unit 307. The separation guide member 500 can be opened and closed between a second closed position (Fig. 5) that covers the second reading unit 307 and the exposed section 90, and a second open position (Fig. 8) that opens the second reading unit 307 and the exposed section 90. The second reading unit 307 is configured to be rotatable about a rotation shaft 314. The second reading unit 307 is rotatable between a reading position where the second flow reading glass 313 faces the reading guide member 403 and an exposed position where the second flow reading glass 313 is exposed to the outside of the device when viewed from above. Here, the reading position is a position when the second reading unit 307 reads an image of a document. As shown in FIG. 3, the outer cover 12 covers the upper side of the separation guide member 500 in the first closed position. Therefore, by opening the outer cover 12 to the first open position, the separation guide member 500 can be rotated.

[0021] The transport guide member 507 is an example of a first unit, which guides the document downstream of the separation guide member 500 and forms one side of the bent transport guide. The reading guide member 403 forms a transport guide on the opposite side of the second reading unit 307. The separation guide member 500 is provided with a rotating shaft 502, and is configured to be rotatable by a user for the purpose of removing a jam or cleaning the second running reading glass 313 provided in the second reading unit 307 and the protective glass 404 of the white sheet 405. Note that in this embodiment, a schematic configuration is described, focusing on the members necessary to explain the configuration of the present invention.

[0022] As shown in FIG. 5, a state in which the second reading unit 307 and the separation guide member 500 are in the closed position will be described. At this time, the pressing portion 505 provided on the separation guide member 500 presses the pressed portion 506 provided on the second reading unit 307 downward from above. As a result, the second running reading glass 313 of the second reading unit 307 abuts against the opposing reading guide member 403 with a predetermined gap therebetween, forming a conveying path. Furthermore, a cam member 501 is provided on the rotation shaft 502 of the separation guide member 500 as an interlocking member. A first contact portion 503 and a second contact portion 504 are provided on each of the separation guide member 500 and the cam member 501.

[0023] Fig. 6 is a front view of the separation guide member 500 rotated in the D1 direction. When the separation guide member 500 rotates by a certain angle or more, the cam member 501 can also rotate in synchronization with the separation guide member 500 (see Figs. 6 to 8). Furthermore, the separation guide member 500 is provided with a first convex portion 510, and when the separation guide member 500 rotates by a certain angle or more, the first convex portion 510 comes into contact with a second convex portion 1901 (described later), thereby maintaining the rotated state.

[0024] On the other hand, the second reading unit 307 is provided with a rotation shaft 314. Fig. 7 is a front view showing a state in which the separation guide member 500 pushes up the second reading unit 307 in the direction D2. As shown in Fig. 7, when the separation guide member 500 rotates beyond a certain angle, a cam portion 509 of the cam member 501 that rotates in synchronization with the separation guide member 500 comes into contact with the second reading unit 307. As a result, the second reading unit 307 starts to rotate in the direction D2 around the rotation shaft 314 in conjunction with the rotation of the separation guide member 500.

[0025] 8 is a front view of the second reading unit 307 and the separation guide member 500 in the open position. As shown in FIG. 8, when the second reading unit 307 rotates to a certain angle, the pressed portion 506 provided on the second reading unit 307 abuts against the angle restricting portion 508 provided on the transport guide member 507, and the second reading unit 307 is unable to rotate. The second reading unit 307, whose rotation is restricted, slides in the D3 direction by the cam member 501. The state shown in FIG. 8 finally becomes a state in which the separation guide member 500 is held in a rotated state by the second convex portion 1901, which is the rotation restricting means, and the second reading unit 307 is also held in a rotated state.

[0026] In this way, when the document is transported, the second running reading glass 313 and the protective glass 404 of the white sheet 405 are inaccessible to the user as shown in Fig. 5. In contrast, by rotating the second reading unit 307 and the separation guide member 500, the user can access both the second running reading glass 313 and the protective glass 404 of the white sheet 405 as shown in Fig. 8. In particular, as shown in Fig. 8, the second reading unit 307 slides in the D3 direction in the latter half of the rotation operation, so that a cleaning space 801 for cleaning the protective glass 404 of the white sheet 405 can be secured.

[0027] [FFC] Next, the configuration of the FFC 9 connected to the second reading unit 307 will be described with reference to Fig. 9 to Fig. 13. Fig. 9 is a perspective view showing the positional relationship between the second reading unit 307 and the FFC 9. Figs. 10 to 12 are diagrams showing the position of the FFC exposed portion 90 with respect to the FFC 9 and the arrangement of the FFC earth sheet 3 as a conductive sheet member.

[0028] As shown in FIG. 9, an FFC9, which is an example of a flexible cable, is connected to a CIS311 provided inside the second reading unit 307, and is covered with an FFC cover member 901 so as to hide the connection portion of the FFC9. As shown in FIG. 10, by configuring the second reading unit 307 to be rotatable inside the ADF 102, when both the outer cover 12 and the separation guide member 500 are open, a part of the FFC9 is exposed to the outside of the device as shown in the exposed portion 90 when viewed from above. That is, the FFC9 is hung between the conveying guide member 507 and the second reading unit 307 at the exposed portion 90, which is an example of a bridging portion, to transmit an electric signal. If a part of the FFC9 is exposed to the outside of the device, there is a risk that static electricity will jump from the user's fingertip to the exposed portion 90 of the FFC9 when the user works, which may lead to a breakdown of an electric component. The exposed portion 90 is the area where the FFC 9 is exposed from the gap between the transport guide member 507 and the second reading unit 307 when the outer cover 12 is positioned in the first open position and the separation guide member 500 is positioned in the second open position.

[0029] In this embodiment, as shown in FIG. 11, the FFC earth sheet 3, which is a conductive sheet member, is provided on the side where the FFC 9 is exposed, so as to cover the exposed portion 90 from above, as viewed from the user. One end of the FFC earth sheet 3 is electrically connected to the ground by a ground wire 1101. That is, the FFC earth sheet 3 is an example of a shield member that is conductive and grounded, and is disposed on the upper transport path 11a side of the exposed portion 90. The FFC earth sheet 3 is conductive and grounded, and is provided so as to release static electricity applied to the exposed portion 90 from the outside. For this reason, the width of the FFC earth sheet 3 is set to be equal to that of the FFC 9. However, this is not limited thereto, and the width may be narrower or wider than that of the FFC 9.

[0030] 12 is a cross-sectional view of the ADF 102 seen from the front, illustrating the arrangement of the FFC grounding sheet 3. In this embodiment, the configuration is such that the user accesses the ADF 102 from above, so the FFC grounding sheet 3 is provided on the exposed portion 90 so as to cover the upper side of the FFC 9.

[0031] As shown in Figs. 5 to 8, since the second reading unit 307 performs a rotational operation, both the FFC 9 and the FFC earth sheet 3 are bent in the area of ​​the FFC exposed portion 90 the same number of times as the expected rotational operation. Therefore, the FFC earth sheet 3 needs to be made of a material that can withstand the expected number of bendings, and in this embodiment, a metal foil composite film is used as the material for the FFC earth sheet 3. The metal foil composite film is a composite material in which aluminum foil is bonded to a PET base material made of polyester film. In other words, the FFC earth sheet 3 is a film having laminated metal layers and polyester layers.

[0032] It is desirable to arrange the FFC earth sheet 3 in the direction from which static electricity is expected to fly, that is, in this embodiment, so that the aluminum foil surface is arranged on the upper side of the FFC 9 in Fig. 12, and the PET base material faces the FFC 9. That is, in this embodiment, the FFC earth sheet 3 is arranged with the polyester layer on the FFC 9 side rather than the metal layer. This allows the FFC earth sheet 3 to function as a shield against static electricity while improving bending durability compared to when a simple aluminum sheet or the like is used.

[0033] Next, with reference to FIG. 13, the FFC cover member 901 provided on the second reading unit 307 is removed, and how the FFC earth sheet 3 is provided on the second reading unit 307 side will be described. FIG. 13 is a diagram showing the arrangement of the FFC earth sheet 3 inside the second reading unit 307. A positioning protrusion 1302 is provided on the second case member 401 constituting the second reading unit 307. The positioning protrusion 1302 is arranged at a position corresponding to a positioning hole portion 1305 of an FFC positioning sheet 1304 attached to the FFC 9 for positioning the FFC 9, and a positioning hole portion 1303 provided on the FFC earth sheet 3. In this embodiment, two each of the positioning holes 1303, 1305 and the positioning protrusions 1302 are provided at a distance in the width direction so that the FFC 9 and the FFC earth sheet 3 do not tilt during the rotation operation of the second reading unit 307.

[0034] The FFC 9 is attached by inserting (fitting) the positioning hole 1305 of the FFC positioning sheet 1304 into the positioning protrusion 1302. Because the top side of the FFC 9 needs to be covered with the FFC earth sheet 3, after the FFC 9 is attached, the positioning hole 1303 of the FFC earth sheet 3 is attached to the positioning protrusion 1302 from above in the same manner.

[0035] The FFC cover member 901 as a fixing member is provided with an FFC fixing surface 1300 for sandwiching and fixing the FFC 9 and the FFC earthing sheet 3 between the top surface of the second case member 401 and the FFC cover member 901. With this configuration, the FFC 9 and the FFC earthing sheet 3 are positioned and fixed inside the second reading unit 307.

[0036] [Second skimming glass] Next, the mounting configuration of the second scanning glass 313 provided in the second reading unit 307 will be described with reference to Figs. 14 to 17. Figs. 14 to 17 are diagrams showing the configuration of a glass earth sheet 1400 provided in the portion of the second scanning glass 313 in this embodiment. As shown in Figs. 14 and 15, the first case member 400 constituting the second reading unit 307 uses a glass earth sheet 1400 having a shape that avoids the opening 402 of the first case member 400 so as not to block the opening 402. The second scanning glass 313 is attached via such a glass earth sheet 1400. The glass earth sheet 1400 is an example of a shield member, and is attached to the second scanning glass 313 and is electrically conductive and grounded. In this embodiment, the glass earth sheet 1400 is interposed between the first case member 400 and the second scanning glass 313.

[0037] The glass earth sheet 1400 is a conductive sheet member having adhesive properties, and may be a conductive double-sided tape, or may be a member in which an aluminum foil tape having an adhesive layer on one side and a double-sided tape are combined. In this embodiment, the glass earth sheet 1400 has adhesive properties on both sides, and the second skimming glass 313 is attached to the first case member 400 by pasting. Alternatively, as shown in FIG. 15, a configuration may be used in which a conductive sheet member 1501 is pasted on a double-sided tape as a first adhesive means 1500, and further a double-sided tape is pasted on the conductive sheet member 1501 as a second adhesive means 1502. Alternatively, an adhesive may be used on both sides of the conductive sheet member 1501 to attach the second skimming glass 313 to the first case member 400. Alternatively, the conductive sheet member 1501 may be sandwiched directly between the second skimming glass 313 and the first case member 400, and the second skimming glass 313 may be attached using a tab formed on the first case member 400, or the second skimming glass 313 may be attached by screwing.

[0038] As described later, in order to electrically connect to the ground via the FFC cover member 901, the glass earth sheet 1400 has an electrical connection portion 1401 that functions as an electrical contact. That is, in the configuration shown in FIG. 15, the first adhesive means 1500 is provided to adhere the first case member 400 and the conductive sheet member 1501. Therefore, the first adhesive means 1500 and the conductive sheet member 1501 have the same shape, and it is possible to attach the first case member 400 including the electrical connection portion 1401 of the conductive sheet member 1501. As for the second adhesive means 1502, since it is only necessary to attach the second skimming glass 313 to the conductive sheet member 1501, it does not have a shape corresponding to the electrical connection portion 1401 of the conductive sheet member 1501 like the first adhesive means 1500.

[0039] In this embodiment, the conductive sheet member 1501 employs the above-mentioned metal foil composite film. That is, the metal foil composite film as the conductive sheet member 1501 is a composite material in which aluminum foil is bonded to a PET base material made of polyester film, and the conductive sheet member 1501 is a film having a laminated metal layer and a polyester layer. The reason for this is that the glass earth sheet 1400 has a shape 1503 that avoids the opening 402, and therefore, if the sheet does not have a certain degree of hardness when it is attached to the first case member 400, it is difficult to attach the sheet. However, if the sheet can be attached easily by using a jig or tool, a simple metal foil may be used instead of the metal foil composite film.

[0040] Here, if the glass earth sheet 1400 is not provided, the following phenomenon may occur. When a user works near the second scanning glass 313, such as removing a jam or cleaning the second scanning glass 313, static electricity may fly from the user's fingertips and enter through a small gap between the second scanning glass 313 and the first case member 400. Similarly, static electricity may fly from a document being transported and enter through a small gap between the second scanning glass 313 and the first case member 400. If such static electricity enters through a small gap between the second scanning glass 313 and the first case member 400, it may flow to electrical components such as LED elements provided in the CIS 311, causing the electrical components to break down. Conventionally, there is a configuration in which the second scanning glass 313 is attached using a simple non-conductive double-sided tape. However, from an electrical standpoint, double-sided tape is the same as an air space, and even if there appear to be no gaps at first glance, static electricity can pass through the double-sided tape, causing electrical components to fail.

[0041] In contrast, in this embodiment, as shown in Fig. 15, the second skidding glass 313 is attached all around its periphery via a conductive sheet member 1501, making it possible to avoid such risks due to static electricity. That is, the glass earth sheet 1400 is provided on the edge portion 402a so as to surround the entire periphery of the opening 402. As a result, the glass earth sheet 1400 dissipates static electricity applied to the second skidding glass 313 from the side of the lower transport path 11b.

[0042] The relationship between the size of the glass earth sheet 1400 and the opening 402 will be described. In this embodiment, the glass earth sheet 1400 is formed to match the size and width of the edge 402a. This allows the adhesive area of ​​the double-sided tape to be widened, and the force with which the second skim-reading glass 313 is attached and held can be increased. In contrast, the glass earth sheet 1400 may be in the form of a thin line in order to release static electricity. However, in this case, the adhesive area of ​​the double-sided tape becomes narrow, so it is necessary to provide a means for holding the second skim-reading glass 313 in addition to the glass earth sheet 1400. Also, even if the glass earth sheet 1400 enters the opening 402, it does not matter as long as it does not interfere with reading by the CIS 311.

[0043] In addition, depending on the layout of the electrical elements and other reasons, there may be cases where it is not necessary to cover the entire circumference of the second scanning glass 313 with the conductive sheet member 1501. In that case, for example, as shown in FIG. 16, a part of the glass earth sheet 1400 may be cut out. That is, the glass earth sheet 1400 may be provided on the edge portion 402a so as to follow a part of the opening 402. Furthermore, for example, if necessary from the viewpoint of assembly, the glass earth sheet 1400 may be composed of a plurality of glass earth sheets provided at different positions as shown in FIG. 17. That is, the edge portion 402a has a first region 402b and a second region 402c different from the first region 402b. A first glass earth sheet 1700, which is an example of a first shielding member, is provided on the first region 402b, and a second glass earth sheet 1701, which is an example of a second shielding member, is provided on the second region 402c. The configuration of the first glass grounding sheet 1700 and the second glass grounding sheet 1701 is the same as that of the glass grounding sheet 1400 except for the shape.

[0044] However, as shown in Figures 16 and 17, when the glass earth sheet 1400 does not cover the entire circumference of the opening 402, a corresponding configuration is required. That is, since the area of ​​the adhesive double-sided tape is reduced, it is desirable to thoroughly consider whether the second skim reading glass 313 will peel off, and to use double-sided tape or the like in addition to the glass earth sheet as necessary. Also, in the area where the glass earth sheet 1400 is not attached, there is a risk of foreign matter entering between the second skim reading glass 313 and the edge 402a, so for this reason it is desirable to fill the gap with double-sided tape or the like.

[0045] Here, the relationship between the arrangement of the LED elements of the CIS 311 and the shape of the glass earth sheet 1400 will be described with reference to Figs. 25(a) and (b). The glass earth sheet 1400 is provided at a predetermined distance from the electric elements, such as LEDs, of the CIS 311, thereby reducing the risk of static electricity being applied to the electric elements. The predetermined distance here is, for example, about 10 mm to 20 mm, about 15 mm, etc. For this reason, as shown in Fig. 25(a), when the LED array 315 is used in the CIS 311, it is desirable that the glass earth sheet 1400 is provided around the entire circumference of the opening 402. Also, as shown in Fig. 25(b), when the LED 316 arranged at the edge is used in the CIS 311, the glass earth sheet 1400 may be provided around the LED 316 within a predetermined distance. In this embodiment, the LED arrangement shown in Fig. 25(b) is used as the arrangement of the LEDs, but the glass earth sheet 1400 provided around the entire circumference of the opening 402 shown in Fig. 25(a) is applied. This is to reduce the possibility of a decrease in the adhesive strength for attaching the second scanning glass 313 and of foreign matter entering through gaps in areas where the glass earth sheet 1400 is not present.

[0046] Next, a configuration in which the electrical connection portion 1401 of the glass earth sheet 1400 is electrically connected to the ground via the FFC cover member 901 will be described with reference to Fig. 18. Fig. 18 is a diagram showing the configuration of the FFC cover member 901 that covers the FFC earth sheet 3 of this embodiment. As shown in Fig. 18, the FFC cover member 901 is provided with a surface 1801 for abutting against the first case member 400, and is configured to abut against the electrical connection portion 1401 of the glass earth sheet 1400. The abutting surface 1801 is formed with a hook portion 1800 for hooking into a hole portion provided in the first case member 400. The FFC cover member 901 is provided with an FFC fixing surface 1300 for sandwiching and fixing the FFC 9 and the FFC earth sheet 3 between the top surface of the second case member 401.

[0047] The FFC cover member 901 is provided with a snap fit portion 1301, which, together with the hook portion 1800, is detachable from the second reading unit 307. A total of four sponges 1802 are provided as elastic members, two on each of the abutting surface 1801 and the FFC fixing surface 1300 of the FFC cover member 901. In addition, two conductive sheet members 1803 are provided to connect the sponges 1802 attached to the abutting surface 1801 and the FFC fixing surface 1300. In this embodiment, the conductive sheet member 1803 does not need to be particularly hard or durable against bending, so an aluminum tape in which an adhesive layer is formed on aluminum foil is used.

[0048] With this configuration, when FFC cover member 901 is attached, one end of conductive sheet member 1803 is pressed against electrical connection portion 1401 of glass earth sheet 1400 by the elastic force of sponge 1802. The other end of conductive sheet member 1803 is pressed against FFC earth sheet 3. As a result, glass earth sheet 1400, FFC earth sheet 3, and earth wire 1101 are all electrically connected, and are also electrically connected to the ground. With this configuration, it is possible to reduce the number of parts compared to a configuration in which glass earth sheet 1400 and FFC earth sheet 3 are separately connected to the ground.

[0049] [Independent operation] Next, with reference to Figs. 19 to 24, it will be described that when the separation guide member 500 is rotated to the open state shown in Figs. 23 and 24, the rotation of the separation guide member 500 and the second reading unit 307 is restricted and the separation guide member 500 and the second reading unit 307 are in a self-supporting state. Fig. 19 is a diagram showing a second convex portion 1901 provided on the front side plate 1900 of this embodiment. Fig. 20 is a diagram showing the relationship between the separation guide member 500 and the cam member 501 of this embodiment. Fig. 21 is a diagram showing the relationship between the separation guide member 500 and the front side plate 1900 of this embodiment. Figs. 22 to 24 are diagrams showing the relationship between the second convex portion 1901 and the first convex portion 510 of this embodiment.

[0050] 19, a front side plate 1900 constituting a frame of the ADF 102 is provided with a fitting groove 1003 for the rotation shaft 314 corresponding to the front side rotation shaft 314 provided in the second reading unit 307. The front side plate 1900 also has a fitting hole 1002 for the rotation shaft 502 corresponding to the front side rotation shaft 502 provided in the separation guide member 500. The front side plate 1900 is provided with a second convex portion 1901 in the vicinity of the fitting hole 1002 as a rotation restriction means for abutting against a first convex portion 510 of the separation guide member 500 to hold the rotational position of the separation guide member 500 which attempts to return to its original position.

[0051] 20, a cam member 501 is attached to a rotation shaft 502 portion of the separation guide member 500 on the front side plate 1900 side, and is provided in a state where it can rotate around the rotation shaft 502 by fitting to the rotation shaft 502. When the separation guide member 500 rotates by a certain angle or more, a first contact portion 503 provided on the separation guide member 500 and a second contact portion 504 provided on the cam member 501 come into contact with each other, and the separation guide member 500 and the cam member 501 rotate synchronously. A first convex portion 510 is provided near the rotation shaft 502 of the separation guide member 500.

[0052] 21 to 23, the fitting hole 1002 of the front side plate 1900 and the rotation shaft 502 of the separation guide member 500 are assembled so as to fit together. Even if the user releases the separation guide member 500, the separation guide member 500 does not return to its original position and can maintain the rotated position by the first convex portion 510 of the separation guide member 500 climbing over the second convex portion 1901 provided on the front side plate 1900.

[0053] The first contact portion 503 of the separation guide member 500 and the second contact portion 504 of the cam member 501 are in contact with each other, so that the rotational posture of the cam member 501 is also maintained. The cam portion 509 of the cam member 501 supports the second reading unit 307, so that the second reading unit 307 is also maintained in a rotational posture. This allows the user to perform cleaning work on the second running glass 313 and the protective glass 404 protecting the white sheet 405 provided on the second reading unit 307 and jam processing work while releasing the separation guide member 500. Note that, in this embodiment, the case where the second convex portion 1901 is used as the rotation restriction means has been described, but is not limited thereto. For example, as shown in FIG. 24, the rotation restriction means corresponding to the first convex portion 510 may be a concave portion 2400 to which the first convex portion 510 corresponds. In addition, at the rear side of the ADF 102, a rear side panel (not shown) is arranged, which has a fitting groove portion and a fitting hole portion similar to those of the front side panel 1900, and the rear side panel supports the second reading unit 307 and the separation guide member 500, similar to the front side panel 1900.

[0054] As described above, according to the image forming apparatus 1 of the present embodiment, the glass earth sheet 1400 is interposed between the second moving glass 313 and the edge portion 402a of the first case member 400. Therefore, even if static electricity attempts to enter between the second moving glass 313 and the edge portion 402a, the static electricity is grounded via the glass earth sheet 1400. This can reduce the possibility that the electrical components constituting the image reading apparatus will break down due to static electricity.

[0055] Furthermore, according to the image forming apparatus 1 of this embodiment, since the glass earth sheet 1400 has adhesiveness on both sides, the second scanning glass 313 can be attached to the edge portion 402a without using any other member. This makes it possible to suppress an increase in the number of parts and assembly steps.

[0056] Moreover, according to the image forming apparatus 1 of this embodiment, a film having a laminated metal layer and a polyester layer is applied as the glass earth sheet 1400. Therefore, since an appropriate rigidity can be obtained, the work of attaching the glass earth sheet 1400 can be facilitated.

[0057] In the above embodiment, the glass earth sheet 1400 is interposed between the second skimming glass 313 and the edge 402a of the first case member 400, but the present invention is not limited to this. That is, the glass earth sheet 1400 may be attached to another position as long as it is configured to release static electricity applied to the second skimming glass 313 from the lower transport path 11b side. For example, the glass earth sheet 1400 may be attached to the surface of the second skimming glass 313 on the lower transport path 11b side, or to the edge of the second skimming glass 313. However, in these cases, the second skimming glass 313 cannot be attached to the edge 402a by the glass earth sheet 1400, so a separate double-sided tape or the like must be used.

[0058] In the above embodiment, the second reading unit 307 is used as the reading section, but the present invention is not limited to this. For example, the second reading unit 307 may be used as a reading sensor of an adjustment device that reads an image on a fixed sheet in order to perform image adjustment in the image forming apparatus 1.

[0059] The present technology can also be configured as follows. (1) a conveying unit that conveys the document to a conveying path; a reading unit that reads an image of a document conveyed through the conveying path, The reading unit includes a reading element that reads an image of a document, a housing that houses the reading element and has an opening forming part that forms an opening through which an optical path of the reading element passes toward the transport path, a transparent member that is attached to the housing and closes the opening, and a shielding member that is attached to the transparent member, has conductivity, and is grounded. Image reading device. (2) The shielding member is interposed between the housing and the transparent member. The image reading device according to (1) above. (3) The shielding member has adhesive on both sides, and the transparent member is attached to the housing by sticking. The image reading device according to (2) above. (4) The shielding member has a film including a laminated metal layer and a polyester layer. The image reading device according to any one of (1) to (3). (5) The shield member is provided at the opening forming portion so as to surround the entire periphery of the opening. The image reading device according to any one of (1) to (4). (6) The shield member is provided in the opening forming portion so as to extend along a portion of the opening. The image reading device according to any one of (1) to (4). (7) the opening formation portion has a first region and a second region different from the first region, the shielding member is a first shielding member provided in the first region, the reading unit is attached to the transparent member, has a conductive and grounded second shield member, and is provided in the second region; The image reading device according to (6) above. (8) the shielding member dissipates static electricity applied to the transparent member from the transport path side; The image reading device according to any one of (1) to (7). (9) a conveying unit that conveys the document to a conveying path; a first reading unit that reads an image on a first side of a document; a second reading unit that reads an image on a second surface of the document opposite to the first surface; a document table glass on which a document is placed, the first reading unit is capable of reading an image of an original placed on the original platen glass while moving in a sub-scanning direction; the second reading unit is the reading unit, and reads an image of the document at a position fixed relatively to the conveying unit; The image reading device according to any one of (1) to (8). (10) the second reading unit is provided rotatably between a reading position for reading an image of a document and an exposure position for exposing the transparent member to the outside. The image reading device according to (9) above. (11) The image reading device according to any one of (1) to (10), and an image forming unit that forms an image read by the image reading device on a sheet. Image forming device. [Explanation of symbols]

[0060] 1...image forming apparatus, 10...image reading apparatus, 11...transport path, 14...transport section, 104...original platen glass, 306...first reading unit (first reading section), 307...second reading unit (reading section, second reading section), 311...CIS (reading element), 313...second running reading glass (transparent member), 400...first case member (housing), 401...second case member (housing), 402...opening (opening), 402a...edge (opening forming section), 1400...glass earth sheet (shielding member), 1700...first glass earth sheet (first shielding member, shielding member), 1701...second glass earth sheet (second shielding member), P...sheet

Claims

1. a conveying unit that conveys the document to a conveying path; a reading unit that reads an image of a document conveyed through the conveyance path, The reading unit includes a reading element that reads an image of a document, a housing that houses the reading element and has an opening forming portion that forms an opening through which an optical path of the reading element passes toward the transport path, a transparent member that is attached to the housing and closes the opening, and a shielding member that is disposed between the transparent member and the housing, has conductivity, and is grounded. An image reading device characterized by:

2. the shielding member has adhesive on both sides, and the transparent member is attached to the housing by sticking.

2. The image reading device according to claim 1, wherein:

3. The shielding member has a film including a laminated metal layer and a polyester layer.

3. The image reading device according to claim 1, wherein the image reading device is a scanning device.

4. The shield member is provided at the opening forming portion so as to surround the entire periphery of the opening.

2. The image reading device according to claim 1, wherein:

5. The shield member is provided in the opening forming portion so as to extend along a part of the opening.

2. The image reading device according to claim 1, wherein:

6. the opening forming portion has a first region and a second region different from the first region, the shielding member is a first shielding member provided in the first region, the reading unit is attached to the transparent member, has a second shield member that is conductive and grounded, and is provided in the second region; 6. The image reading device according to claim 5, wherein:

7. the shielding member dissipates static electricity applied to the transparent member from the transport path side; 2. The image reading device according to claim 1, wherein:

8. a conveying unit that conveys the document to a conveying path; a first reading unit that reads an image on a first side of a document; a second reading unit that reads an image on a second surface of the document opposite to the first surface; a document table glass on which a document is placed, the first reading unit is capable of reading an image of a document placed on the document platen glass while moving in a sub-scanning direction; the second reading unit is the reading unit, and reads an image of the document at a position fixed relatively to the conveying unit; 2. The image reading device according to claim 1, wherein:

9. the second reading unit is provided rotatably between a reading position where the second reading unit reads an image of a document and an exposure position where the second reading unit exposes the transparent member to the outside.

9. The image reading device according to claim 8, wherein:

10. The image reading device according to claim 1; an image forming unit that forms an image read by the image reading device on a sheet, An image forming apparatus characterized by:

Images