Image reading apparatus

Abstract

To suppress the occurrence of interference fringes without using special parts.SOLUTION: The downstream side guide members 22 are arranged along a region further downstream of a downstream adjacent region adjacent to the downstream side of the reading region 16b on the first surface of the transparent plate member 16. The upstream adhesive layer 25a is formed in an upstream adjacent area 162 adjacent to the upstream side of the reading area 16b. The downstream side adhesive layers 25b and 25c are formed on the downstream side adjacent regions and the surfaces of the downstream side guide members 22. The transparent sheet 24 is bonded to the first face of the transparent plate member 16 and the surfaces of the downstream side guide members 22 by the upstream side adhesive layer 25a and the downstream side adhesive layers 25b, 25c. The upstream side adhesive layer 25a and the downstream side adhesive layers 25b, 25c form a gap between the reading area 16b of the transparent plate member 16 and the transparent sheet 24.SELECTED DRAWING: Figure 4

Description

[Technical Field]

[0001] The present invention relates to an image reading device equipped with a document transport device. [Background technology]

[0002] The image reading device may include a document transport device that transports a document along a transport path that passes through a reading area on the surface of a transparent glass plate. The image reading device reads an image of the document passing through the reading area by irradiating light through the glass plate toward the reading area and detecting the amount of reflected light.

[0003] In the image reading device, it is known that a transparent sheet is placed on the surface of the glass plate, and the surface of the transparent sheet is subjected to a surface treatment for suppressing surface reflection (see, for example, Patent Document 1).

[0004] The transparent sheet covers a step formed by members arranged in an area adjacent to the reading area on the surface of the glass plate, and smoothly guides the document passing through the reading area.

[0005] The surface treatment of the transparent sheet suppresses the occurrence of interference fringes due to light reflected from the surface of the glass plate and light reflected from the surface of the transparent sheet. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Japanese Patent Application Laid-Open No. 2010-41481 Summary of the Invention [Problem to be solved by the invention]

[0007] However, the transparent sheet that has been subjected to the surface treatment is a special component, which increases costs. It is therefore desirable to be able to suppress the occurrence of the interference fringes without using special components.

[0008] The object of the present invention is to provide an image reading device that can suppress the occurrence of interference fringes caused by reflected light on the surface of a transparent plate member and reflected light on the surface of a transparent sheet placed on the surface of the transparent plate member without using special parts. [Means for solving the problem]

[0009] According to one aspect of the present invention, an image reading device includes a transparent plate member, a document transport device, a main optical device, a downstream guide member, an upstream adhesive layer, a downstream adhesive layer, and a transparent sheet. The document transport device transports a document along a transport path that passes through a reading area on a first surface of the transparent plate member. The main optical device is disposed on the second surface side of the transparent plate member and reads an image on the first reading surface of the document passing through the reading area by irradiating light toward the reading area and detecting the amount of reflected light. The downstream guide member is disposed along an area further downstream in the document transport direction than a downstream adjacent area that is adjacent to the reading area on the first surface of the transparent plate member on the downstream side in the document transport direction, and guides the document that has passed through the reading area. The upstream adhesive layer is formed in the upstream adjacent area that is adjacent to the reading area on the first surface of the transparent plate member on the upstream side in the document transport direction. The downstream adhesive layer is formed on the downstream adjacent region on the first surface of the transparent plate member and on the surface of the downstream guide member. The transparent sheet is disposed from the upstream adjacent region on the first surface of the transparent plate member to the surface of the downstream guide member and is adhered to the first surface of the transparent plate member and the surface of the downstream guide member by the upstream adhesive layer and the downstream adhesive layer. The upstream adhesive layer and the downstream adhesive layer form a gap between the reading region on the first surface of the transparent plate member and the transparent sheet. [Effects of the Invention]

[0010] According to the present invention, it is possible to provide an image reading device that can suppress the occurrence of interference fringes caused by reflected light on the surface of a transparent plate member and reflected light on the surface of a transparent sheet placed on the surface of the transparent plate member without using any special parts. [Brief explanation of the drawings]

[0011] [Figure 1] FIG. 1 is a diagram showing the configuration of an image reading apparatus according to an embodiment. [Figure 2] FIG. 2 is a configuration diagram of a CIS unit in the image reading apparatus according to the embodiment. [Figure 3] FIG. 3 is a top view of the main body of the image reading device according to the embodiment. [Figure 4] FIG. 4 is a cross-sectional view of the upper part of the main body of the image reading device according to the embodiment. [Figure 5] FIG. 5 is a cross-sectional view of the reading area of ​​the transparent plate member and its surrounding area in the image reading device according to the embodiment. [Figure 6] FIG. 6 is a plan view of an adhesive layer in the image reading device according to the embodiment. [Figure 7] FIG. 7 is a configuration diagram of a scanning unit according to a modified example of the image reading device according to the embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0012] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. Note that the following embodiment is an example of the present invention, and does not limit the technical scope of the present invention.

[0013] [Configuration of image reading device 1] The image reading device 1 according to the first embodiment executes image reading processing to read an image of a document 9. For example, the image reading device 1 may be configured as a part of an image processing device such as a copying machine, a facsimile machine, or a multifunction peripheral.

[0014] In the following description, the image read from the document 9 by the image reading process of the image reading device 1 will be referred to as a read image.

[0015] 1, the image reading device 1 includes a main body 101 and a main body cover 102. The main body 101 includes a scanning unit 10, an AFE (Analog Front End) 14x, a transparent plate member 16, and a unit driving device 17. The main body cover 102 includes a document transport device 15.

[0016] The image reading device 1 further includes a user interface device 3 and a control device 5. In the example shown in FIG.

[0017] The longitudinal direction of the scanning unit 10 is the main scanning direction D1. The scanning unit 10 includes a first CIS unit (Contact Image Sensor Unit) 1x and a carriage 100 that supports the first CIS unit 1x.

[0018] 1, the direction into the drawing is the main scanning direction D1, and the direction to the left and right is the sub-scanning direction D2, which is a direction perpendicular to the main scanning direction D1.

[0019] 1, 3, and 5, the second direction D22 is one direction along the sub-scanning direction D2, and the first direction D21 is the other direction along the sub-scanning direction D2. That is, the first direction D21 is the opposite direction to the second direction D22.

[0020] The transparent plate member 16 is, for example, a glass plate. The transparent plate member 16 constitutes a part of the upper surface of the main body 101. The transparent plate member 16 is arranged in the horizontal direction. A first surface 16x of the transparent plate member 16 is the upper surface of the transparent plate member 16, and a second surface 16y of the transparent plate member 16 is the lower surface of the transparent plate member 16.

[0021] The first surface 16x of the transparent plate member 16 includes a document placement area 16a and a reading area 16b (see FIGS. 1 and 3). The document placement area 16a is an area where the document 9 is placed. The reading area 16b is an area through which the document 9 passes when it is transported.

[0022] The reading area 16b is an area on the second direction D22 side of the document placement area 16a. In other words, the document placement area 16a is an area on the first direction D21 side of the reading area 16b.

[0023] The main body 101 further includes a plate surface cover member 18 disposed along the first surface 16x of the transparent plate member 16. The plate surface cover member 18 is made of a synthetic resin material.

[0024] A first opening 18a and a second opening 18b are formed in the plate surface cover member 18 (see FIGS. 1, 3, and 4). The first opening 18a exposes a portion of the transparent plate member 16, including the document placement area 16a. The second opening 18b exposes another portion of the transparent plate member 16, including the reading area 16b.

[0025] 3, the first opening 18a is a notch formed by cutting inward from the front side and the side side in the first direction D21 of the main body 101. This allows the original 9 to be easily removed from the transparent plate member 16 by sliding it from above the original placement area 16a to the front side or the side side. The first opening 18a is a rectangular hole.

[0026] The first opening 18a may be a rectangular notch formed by cutting inward from the front side of the main body 101. In this case, the original 9 can be removed from the transparent plate member 16 by sliding the original 9 from the original placement area 16a toward the front side.

[0027] The main body 101 further includes a first white reference member 21 and a second white reference member 22 arranged along the first surface 16x of the transparent plate member 16 (see FIGS. 3 and 4). In this embodiment, the first white reference member 21 is arranged on the first direction D21 side of the reading area 16b. The second white reference member 22 is arranged on the second direction D22 side of the first white reference member 21.

[0028] The scanning unit 10 is supported so as to be movable in the second direction D22 and the first direction D21 in a movable area along the second surface 16y of the transparent plate member 16. The movable area extends from an area facing the document placement area 16a to an area facing the reading area 16b.

[0029] The unit driving device 17 moves the scanning unit 10 in the second direction D22 or the first direction D21 within the movable range. The unit driving device 17 includes a unit support 17a, a motor 17b, a power transmission mechanism 17c, and a motor driving circuit 17d.

[0030] The unit support portion 17a supports the scanning unit 10 so that it can move along the sub-scanning direction D2. The motor 17b is a drive source for a mechanism that moves the scanning unit 10. The power transmission mechanism 17c converts the rotational force of the motor 17b into a force along the sub-scanning direction D2 and transmits the force to the scanning unit 10.

[0031] When the motor 17b rotates in the first rotation direction or the second rotation direction, the scanning unit 10 moves in the second direction D22 or the first direction D21.

[0032] The motor drive circuit 17d rotates the motor 17b in accordance with a control command from the control device 5. The control device 5 operates the unit drive device 17 by outputting the control command.

[0033] The body cover 102 is supported so as to be rotatable between a closed position where it covers the body surface and an open position where it exposes the body surface. The body surface is a surface portion of the body 101 that is aligned with the first surface 16x of the transparent plate member 16. In the closed position, the body cover 102 covers the document placement area 16a and the reading area 16b.

[0034] The image reading device 1 is capable of executing a stationary document reading process. In the stationary document reading process, the scanning unit 10 moves along the document placement area 16a, and the first CIS unit 1x reads an image of the surface of the document 9 placed on the document placement area 16a that faces the transparent plate member 16.

[0035] The document transport device 15 sends out the document 9 on the supply tray 151 to the transport path 150. The document transport device 15 then transports the document 9 along the transport path 150 passing through the reading area 16b. The document transport device 15 then discharges the document 9 from the transport path 150 onto the discharge tray 152.

[0036] The image reading device 1 can perform a transported document reading process with the main body cover 102 closed. In the transported document reading process, the unit drive device 17 holds the scanning unit 10 in a position facing the reading area 16b, and the document transport device 15 transports the document 9 along the transport path 150. Furthermore, the first CIS unit 1x reads an image of the first reading surface of the document 9 passing through the reading area 16b.

[0037] The image reading device 1 further includes a second CIS unit 1y provided on the body cover 102 (see FIGS. 1 and 4). The second CIS unit 1y is disposed opposite the second white reference member 22 across the transport path 150 (see FIG. 4). That is, the second CIS unit 1y is disposed on the first direction D21 side of the reading area 16b.

[0038] In the transported document reading process, the second CIS unit 1y reads an image on the second reading surface of the document 9 that has passed through the reading area 16b.

[0039] As shown in FIG. 2, each of the first CIS unit 1x and the second CIS unit 1y includes a light emitting unit 11, a lens 13, and an image sensor .

[0040] The light-emitting unit 11, the lens 13, and the image sensor 14 are arranged along the main scanning direction D1. The longitudinal direction of the light-emitting unit 11, the lens 13, and the image sensor 14 is the main scanning direction D1.

[0041] The light-emitting unit 11 emits light. The light-emitting unit 11 of the first CIS unit 1x emits light toward the document placement area 16a or the reading area 16b through the transparent plate member 16 (see FIG. 4). The light-emitting unit 11 of the second CIS unit 1y emits light toward the second white reference member 22 (see FIG. 4).

[0042] When the scanning unit 10 moves along the document placement area 16a, the light-emitting unit 11 of the first CIS unit 1x emits light toward the document placement area 16a. When the scanning unit 10 is held at a position facing the reading area 16b, the light-emitting unit 11 of the first CIS unit 1x emits light toward the reading area 16b.

[0043] Light emitted by the light-emitting unit 11 is reflected by the original 9. For example, the light-emitting unit 11 includes a light source and a light-guiding member arranged along the main scanning direction D1. The light-guiding member guides the light from the light source incident from one end of the light-guiding member in the main scanning direction D1 and radiates the light in a direction intersecting the main scanning direction D1. For example, the light-guiding member is a synthetic resin member.

[0044] The lens 13 is a condenser lens that guides reflected light of light emitted from the light-emitting unit 11 to the image sensor 14. The reflected light is light that is diffusely reflected by the original 9. The reflected light may also be light that is diffusely reflected by a first white reference member 21 or a second white reference member 22, which will be described later.

[0045] The image sensor 14 receives the reflected light and detects the amount of the reflected light. Furthermore, the image sensor 14 outputs a line image signal Ia0 representing the detection result of the amount of the reflected light to the AFE 14x (see FIG. 1).

[0046] In this embodiment, the image sensor 14 is a CMOS type line sensor. The lens 13 is an example of a light guide member that guides the reflected light to the image sensor 14.

[0047] As described above, the first CIS unit 1x reads an image on one side of the document 9 placed in the document placement area 16a by irradiating the document placement area 16a with light and detecting the amount of reflected light.

[0048] Furthermore, the first CIS unit 1x irradiates light toward the reading area 16b and detects the amount of reflected light to read an image on the first reading surface of the document 9 passing through the reading area 16b. The first CIS unit 1x is an example of a main optical device.

[0049] The unit drive device 17 is an example of a scanning mechanism that changes the light irradiation position of the main optical device between the reading area 16b and the document placement area 16a by moving part or all of the main optical device along the second surface 16y of the transparent plate member 16.

[0050] In this embodiment, the unit driving device 17 moves the entire first CIS unit 1x along the second surface 16y of the transparent plate member 16.

[0051] On the other hand, the second CIS unit 1y irradiates light onto the surface of the second white reference member 22 and detects the amount of reflected light, thereby reading an image on the second reading surface of the document 9 passing over the surface of the second white reference member 22. The second CIS unit 1y is an example of a secondary optical device.

[0052] The AFE 14x converts the analog line image signal Ia0 into digital line image data Id0 and outputs the line image data Id0 to the control device 5. The line image data Id0 includes a plurality of pixel data for one line in the main scanning direction D1.

[0053] The line image data Id0 for a plurality of lines corresponding to one page of the document 9 is the data of the read image corresponding to one page of the document 9.

[0054] The image sensor 14 reads the image of the document 9 as a color image. Therefore, the data of the read image is color image data that represents the amount of reflected light of the three colors of red, green, and blue.

[0055] In this embodiment, the light-emitting unit 11 includes a red light-emitting unit 11R, a green light-emitting unit 11G, and a blue light-emitting unit 11B that emit red, green, and blue light, respectively (see FIG. 2). Three-color line image data Id0 obtained when the red light-emitting unit 11R, the green light-emitting unit 11G, and the blue light-emitting unit 11B emit light sequentially constitutes the data of the read image.

[0056] The user interface device 3 includes an operation device that accepts user operations and a display device that can display images and other information. For example, the operation device includes operation buttons and a touch panel. The display device includes a display panel such as a liquid crystal panel.

[0057] The control device 5 controls various electrical devices included in the image reading device 1. For example, the control device 5 controls the motor drive circuit 17d and the first CIS unit 1x to cause the image reading device 1 to execute the stationary document reading process. Furthermore, the control device 5 controls the document transport device 15, the first CIS unit 1x, and the second CIS unit 1y to cause the image reading device 1 to execute the transported document reading process.

[0058] Furthermore, the control device 5 executes various image processes on the line image data Id0 obtained by the stationary document reading process or the conveyed document reading process.

[0059] The surface of the first white reference member 21 facing the first CIS unit 1x is a uniform white surface 21a with high diffuse reflectance. The surface of the second white reference member 22 facing the second CIS unit 1y is a uniform white surface 22a with high diffuse reflectance. For example, the first white reference member 21 and the second white reference member 22 are each a sheet or plate made of synthetic resin.

[0060] The first white reference member 21 is disposed on the underside of the portion between the first opening 18a and the second opening 18b in the plate surface cover member 18 (see FIG. 4). That is, the first white reference member 21 is disposed in the region between the document placement region 16a and the reading region 16b in the sub-scanning direction D2.

[0061] The second white reference member 22 is disposed at an end in the first direction D21 of the region within the second opening 18b of the plate surface cover member 18 on the first surface 16x of the transparent plate member 16 (see FIG. 4).

[0062] In this embodiment, the second white reference member 22 is disposed at a distance from the first white reference member 21 in the second direction D22.

[0063] The control device 5 sets shading correction data for the first CIS unit 1x based on the read data of the surface of the first white reference member 21 by the first CIS unit 1x. Similarly, the control device 5 sets shading correction data for the second CIS unit 1y based on the read data of the surface of the second white reference member 22 by the second CIS unit 1y.

[0064] The main body 101 of the image reading device 1 further includes a transparent sheet 24 arranged along an area including the reading area 16b on the first surface 16x of the transparent plate member 16 (see FIGS. 3 and 4).

[0065] The transparent sheet 24 covers the step formed at the boundary between the first surface 16x of the transparent plate member 16 and the second white reference member 22, and smoothly guides the document 9 passing through the reading area 16b (see FIGS. 4 and 5).

[0066] In the image reading device 1, it is necessary to suppress the occurrence of interference fringes caused by light reflected from the first surface 16x of the transparent plate member 16 and light reflected from the surface of the transparent sheet 24. The interference fringes adversely affect the data of the read image.

[0067] It is known that the surface of the transparent sheet 24 is subjected to a surface treatment to suppress surface reflection. However, a surface-treated sheet is a special component, which increases costs. It is desirable to be able to suppress the occurrence of the interference fringes without using special components.

[0068] The image reading device 1 has a configuration for suppressing, without using any special parts, the occurrence of interference fringes caused by light reflected from the first surface 16x of the transparent plate member 16 and light reflected from the surface of the transparent sheet 24. The configuration will be described below.

[0069] In the following description, the area adjacent to the reading area 16b on the first surface 16x of the transparent plate member 16 on the downstream side in the document transport direction will be referred to as a downstream adjacent area 161 (see FIGS. 4 and 5).

[0070] Moreover, an area adjacent to the reading area 16b on the first surface 16x of the transparent plate member 16 on the upstream side in the document transport direction is referred to as an upstream adjacent area 162 (see FIGS. 4 and 5).

[0071] In this embodiment, the document transport direction when the document 9 passes through the reading area 16b is a first direction D21 (see FIGS. 1, 3 to 5). In the following description, the downstream side of the document transport direction is referred to as the first direction D21 side, and the upstream side of the document transport direction is referred to as the second direction D22 side.

[0072] The second white reference member 22 is arranged along an area on the first surface 16x of the transparent plate member 16 further in the first direction D21 than the downstream adjacent area 161. In this embodiment, the second white reference member 22 also serves as a downstream guide member that guides the document 9 that has passed through the reading area 16b. It can be said that the downstream guide member also serves as the second white reference member 22.

[0073] The main body 101 of the image reading device 1 further includes an adhesive layer 25 that adheres the transparent sheet 24 to the first surface 16x of the transparent plate member 16 and the surface of the second white reference member 22 (see FIGS. 4 and 5). The adhesive layer 25 includes an upstream adhesive layer 25a and downstream adhesive layers 25b and 25c. In this embodiment, the downstream adhesive layers 25b and 25c include a first downstream adhesive layer 25b and a second downstream adhesive layer 25c.

[0074] The upstream adhesive layer 25a is formed in an upstream adjacent region 162 on the first surface 16x of the transparent plate member 16 (see FIGS. 4 and 5). The downstream adhesive layers 25b and 25c are formed in a downstream adjacent region 161 on the first surface 16x of the transparent plate member 16 and on the surface of the second white reference member 22.

[0075] In this embodiment, the first downstream adhesive layer 25b is formed in the downstream adjacent region 161, and the second downstream adhesive layer 25c is formed on the surface of the second white reference member 22 (see FIGS. 4 and 5).

[0076] The transparent sheet 24 is disposed from the upstream adjacent region 162 on the first surface 16x of the transparent plate member 16 to the surface of the second white reference member 22 (see FIGS. 4 and 5). For example, the thickness of the transparent sheet 24 is approximately 0.1 to 0.2 millimeters. The transparent sheet 24 is adhered to the first surface 16x of the transparent plate member 16 and the surface of the second white reference member 22 by an upstream adhesive layer 25a and downstream adhesive layers 25b and 25c.

[0077] The upstream adhesive layer 25a and the first downstream adhesive layer 25b form a gap G1 between the reading area 16b on the first surface 16x of the transparent plate member 16 and the transparent sheet 24 (see FIG. 5).

[0078] For example, the thickness of the upstream adhesive layer 25a and the first downstream adhesive layer 25b is about 0.1 to 0.15 mm, which forms a gap G1 of about 0.1 to 0.15 mm between the reading area 16b of the transparent plate member 16 and the transparent sheet 24.

[0079] Generally, the interference fringes are likely to occur when the distance between the first surface 16x of the transparent plate member 16 and the transparent sheet 24 is about 1 micron. The gap G1 between the transparent plate member 16 and the transparent sheet 24 prevents the occurrence of the interference fringes.

[0080] For example, the upstream adhesive layer 25a and the downstream adhesive layers 25b and 25c are each a double-sided adhesive sheet. In this embodiment, the adhesive layer 25 is composed of a first double-sided adhesive sheet 251 and a second double-sided adhesive sheet 252 (see FIG. 6).

[0081] An opening 251a that exposes the reading area 16b is formed in the first double-sided adhesive sheet 251. The portion of the first double-sided adhesive sheet 251 on the second direction D22 side of the opening 251a is the upstream adhesive layer 25a. The portion of the first double-sided adhesive sheet 251 on the first direction D21 side of the opening 251a is the first downstream adhesive layer 25b. The second double-sided adhesive sheet 252 is the second downstream adhesive layer 25c.

[0082] By employing the image reading device 1, it is possible to suppress the occurrence of the interference fringes without using any special parts.

[0083] The image reading device 1 further includes a non-transparent sheet cover member 26 (see FIGS. 4 and 5). The sheet cover member 26 is adhered to the surface of the upstream adjacent region 162 of the transparent sheet 24. For example, the sheet cover member 26 is a sheet or plate made of synthetic resin.

[0084] A step is formed at the boundary between the downstream edge of the sheet cover member 26 in the document conveying direction and the transparent sheet 24. For example, the thickness of the sheet cover member 26 is about 0.1 to 0.2 mm.

[0085] The leading edge of the document 9 heading toward the reading area 16b comes into contact with the sheet cover member 26, and then comes into contact with a portion of the sheet cover member 26 that is downstream in the document transport direction from the portion along the reading area 16b.

[0086] That is, the sheet cover member 26 prevents the leading edge of the document 9 from directly hitting the portion of the transparent sheet 24 that is along the reading area 16b. This makes it less likely that the portion of the transparent sheet 24 that is along the reading area 16b will be damaged, and the data of the read image will be adversely affected by the damage to the transparent sheet 24.

[0087] Furthermore, by providing the non-transparent sheet cover member 26, it is possible to prevent the upstream adhesive layer 25a from being visible through the transparent sheet 24, which would impair the aesthetic appearance.

[0088] The image reading device 1 also includes an upstream guide member 18c and a rear guide member 18d (see FIGS. 4 and 5).

[0089] The upstream guide member 18c is disposed along a region upstream in the document transport direction with respect to the upstream adjacent region 162 on the first surface 16x of the transparent plate member 16. The upstream guide member 18c guides the document 9 to the surface of the sheet cover member 26 and the reading region 16b of the transparent plate member 16.

[0090] In this embodiment, the upstream guide member 18c is a portion of the plate surface cover member 18 that is upstream of the second opening 18b in the document transport direction.

[0091] The rear guide member 18d is disposed along an area downstream in the document transport direction from the second white reference member 22 on the first surface 16x of the transparent plate member 16. The rear guide member 18d guides the document 9 that has passed over the surface of the second white reference member 22.

[0092] In this embodiment, the rear guide member 18d is a portion of the plate surface cover member 18 that is downstream of the second opening 18b in the document transport direction.

[0093] The upstream guide member 18c and the rear guide member 18d smoothly guide the document 9 on the upstream and downstream sides of the transparent sheet 24 in the document transport direction.

[0094] [First Modification] Hereinafter, a first modified example of the image reading device 1 will be described with reference to FIG.

[0095] The image reading device according to the first modification has a configuration in which the scanning unit 10 of the image reading device 1 is replaced with a scanning unit 10A shown in FIG.

[0096] The scanning unit 10A includes a light emitting unit 11, one or more mirrors 12, a lens 13, an image sensor 14a, and a carriage 100. The carriage 100 supports the light emitting unit 11, the mirror 12, the lens 13, and the image sensor 14a.

[0097] The mirror 12 and the lens 13 are an example of a light guide member that guides the reflected light to the image sensor 14a. The image sensor 14a is a CCD (Charge Coupled Device) type line sensor.

[0098] In this modification, the scanning unit 10A is an example of the main optical device. In this modification, the unit driving device 17 is an example of a scanning mechanism that moves the entire main optical device along the second surface 16y of the transparent plate member 16.

[0099] Like the image sensor 14, the image sensor 14a also receives light guided by the light-guiding member and outputs a line image signal Ia0 that represents the amount of received light. When this modified example is adopted, the same effects as when the image reading device 1 is adopted can be obtained.

[0100] [Second Modification] Next, a description will be given of a second modified example of the image reading device 1. This modified example is a modification of the first modified example.

[0101] In this modification, the carriage 100 is divided into a first carriage and a second carriage that move at different speeds. The first carriage supports the light-emitting unit 11 and some of the mirrors 12, and the second carriage supports the remaining part of the mirrors 12.

[0102] Furthermore, the lens 13 and the image sensor 14 a are fixed inside the main body 101 .

[0103] The mirror 12 supported by the first carriage guides the light reflected by the original 9 to the mirror 12 supported by the second carriage, and the mirror 12 supported by the second carriage guides the light to the lens 13 and image sensor 14a fixed within the main body 101.

[0104] In this modification, the first carriage, the second carriage, the light emitting unit 11, the plurality of mirrors 12, the lens 13, and the image sensor 14a are an example of the main optical device.

[0105] In this modified example, the unit driving device 17 moves the first carriage and the second carriage along the second surface 16y of the transparent plate member 16. That is, in this modified example, the unit driving device 17 is an example of a scanning mechanism that moves a part of the main optical device along the second surface 16y of the transparent plate member 16.

[0106] When this modification is adopted, the same effects as when the first modification is adopted can be obtained.

[0107] [Notes on the Invention] The following is a summary of the invention extracted from the above-described embodiment. Note that the configurations and processing functions described in the following supplementary notes can be selected and combined as desired.

[0108] <Appendix 1> A transparent plate member; a document transport device that transports a document along a transport path that passes through a reading area on a part of the first surface of the transparent plate member; a main optical device disposed on the second surface side of the transparent plate member, which irradiates light toward the reading area and detects the amount of reflected light to read an image of the first reading surface of the document passing through the reading area; a downstream guide member that is arranged along a region further downstream in the document transport direction than a downstream adjacent region that is adjacent to the reading region on the first surface of the transparent plate member on the downstream side in the document transport direction, and that guides the document that has passed through the reading region; an upstream adhesive layer formed in an upstream adjacent region adjacent to the reading region on the first surface of the transparent plate member on the upstream side in the document conveying direction; a downstream adhesive layer formed on the downstream adjacent region on the first surface of the transparent plate member and on the surface of the downstream guide member; a transparent sheet disposed across the upstream adjacent region on the first surface of the transparent plate member and the surface of the downstream guide member, and adhered to the first surface of the transparent plate member and the surface of the downstream guide member by the upstream adhesive layer and the downstream adhesive layer, The upstream adhesive layer and the downstream adhesive layer form a gap between the reading area on the first surface of the transparent plate member and the transparent sheet.

[0109] <Appendix 2> The image reading device according to claim 1, further comprising a non-transparent sheet cover member adhered to the surface of the upstream adjacent region of the transparent sheet.

[0110] <Appendix 3> The image reading device described in Appendix 2 is provided with an upstream guide member arranged along an upstream region in the document transport direction relative to the upstream adjacent region on the first surface of the transparent plate member, and guiding the document to the surface of the sheet cover member and the reading region.

[0111] <Appendix 4> 4. The image reading device according to claim 1, wherein each of the upstream adhesive layer and the downstream adhesive layer is a double-sided adhesive sheet.

[0112] <Appendix 5> a secondary optical device disposed opposite the downstream guide member across the transport path, irradiating a surface of the downstream guide member with light and detecting an amount of reflected light to read an image of a second reading surface of the document passing through the surface of the downstream guide member; 5. The image reading device according to claim 1, wherein a surface of the downstream guide member is white.

[0113] <Appendix 6> a main body including the transparent plate member, the main optical device, the downstream guide member, the upstream adhesive layer, the downstream adhesive layer, and the transparent sheet; An image reading device described in any one of Supplementary Note 1 to Supplementary Note 5, comprising the document transport device and a body cover supported movably between a closed position that covers a body surface portion along the first surface of the transparent plate member in the body and an open position that opens the body surface portion.

[0114] <Appendix 7> The image reading device described in Appendix 6, further comprising a scanning mechanism disposed in the main body and configured to move part or all of the main optical device along the second surface of the transparent plate member, thereby changing the light irradiation position of the main optical device between the reading area and a document placement area other than the reading area on the first surface of the transparent plate member. [Explanation of symbols]

[0115] 1: Image reader 1x: 1st CIS unit 1y: 2nd CIS Unit 5: Control device 10: Scanning unit 10A: Scanning unit 11: Light emitting part 12: Mirror 13: Lens 14: Image sensor 14a: Image sensor 15: Document transport device 16: Transparent plate member 16a: Document placement area 16b: Reading area 16x: First surface of transparent plate 16y: Second surface of transparent plate member 17: Unit drive device 18: Panel cover member 18a: 1st opening 18b: 2nd opening 18c: Upstream guide member 18d: Rear guide member 21: First white reference member 22: Second white reference member (downstream guide member) 24: Transparent sheet 25: Adhesive layer 25a: Upstream adhesive layer 25b: 1st downstream adhesive layer 25c: 2nd downstream adhesive layer 26: Seat cover material 101: Main unit 102: Main body cover 161: downstream adjacent region 162: Upstream adjacent region 251: First double-sided adhesive sheet 251a:Aperture 252: Second double-sided adhesive sheet D1: Main scanning direction D2: Sub-scanning direction G1: Gap

Claims

1. A transparent plate member; a document transport device that transports a document along a transport path that passes through a reading area that is a part of the first surface of the transparent plate member; a main optical device disposed on the second surface side of the transparent plate member, which irradiates light toward the reading area and detects the amount of reflected light to read an image of the first reading surface of the document passing through the reading area; a downstream guide member disposed along a region further downstream in the document transport direction than a downstream adjacent region adjacent to the reading region on the first surface of the transparent plate member on the downstream side in the document transport direction, and configured to guide the document that has passed through the reading region; an upstream adhesive layer formed in an upstream adjacent region adjacent to the reading region on the first surface of the transparent plate member on the upstream side in the document conveying direction; a downstream adhesive layer formed on the downstream adjacent region on the first surface of the transparent plate member and on a surface of the downstream guide member; a transparent sheet disposed across the upstream adjacent region on the first surface of the transparent plate member and the surface of the downstream guide member, and adhered to the first surface of the transparent plate member and the surface of the downstream guide member by the upstream adhesive layer and the downstream adhesive layer, The upstream adhesive layer and the downstream adhesive layer form a gap between the reading area on the first surface of the transparent plate member and the transparent sheet.

2. 2. The image reading device according to claim 1, further comprising a non-transparent sheet cover member adhered to a surface of the transparent sheet in the upstream adjacent region.

3. 3. The image reading device of claim 2, further comprising an upstream guide member arranged along an upstream region of the document transport direction relative to the upstream adjacent region on the first surface of the transparent plate member, and guiding the document to the surface of the sheet cover member and the reading region.

4. The image reading device according to claim 1 , wherein each of the upstream adhesive layer and the downstream adhesive layer is a double-sided adhesive sheet.

5. a secondary optical device disposed opposite the downstream guide member across the transport path, irradiating a surface of the downstream guide member with light and detecting an amount of reflected light to read an image on a second reading surface of the document passing through the surface of the downstream guide member; 4. The image reading device according to claim 1, wherein a surface of the downstream guide member is white.

6. a main body including the transparent plate member, the main optical device, the downstream guide member, the upstream adhesive layer, the downstream adhesive layer, and the transparent sheet; 4. An image reading device as described in any one of claims 1 to 3, comprising the document transport device and a body cover supported movably between a closed position that covers a body surface portion along the first surface of the transparent plate member in the body and an open position that opens the body surface portion.

7. 7. The image reading device according to claim 6, further comprising a scanning mechanism disposed on the main body and configured to move a part or all of the main optical device along the second surface of the transparent plate member, thereby changing the light irradiation position of the main optical device between the reading area and a document placement area other than the reading area on the first surface of the transparent plate member.

Images