WO2016147270A1

WO2016147270A1 - Image reading device

Info

Publication number: WO2016147270A1
Application number: PCT/JP2015/057582
Authority: WO
Inventors: 高畠　昌尚; 雅彦小箱; 寛史白岩
Original assignee: 株式会社Pfu
Priority date: 2015-03-13
Filing date: 2015-03-13
Publication date: 2016-09-22
Also published as: JPWO2016147270A1; JP6293970B2

Abstract

In order to provide an image reading device 1 capable of suppressing image quality deterioration due to regular reflection of external light E without deteriorating workability during reading operations, the present invention is provided with: an image pickup unit 22, which has a charge coupled device (CCD) 27, which picks up an image of a part of a placing surface 2 on which a medium S is placed, and reads the image; a drive device 31 that moves a reading line L of the CCD 27 in one direction; a light blocking unit 60, which is disposed above the placing surface 2, and blocks light; a motor 71 that moves the light blocking unit 60 in one direction; and a control unit 80 that drive-controls at least the motor 71. When the image pickup unit 22 picks up an image, the control unit 80 controls the movement of the light blocking unit 60 by means of the motor 71 in conjunction with the reading line L movement made by the drive device 31, and in the movement control of the light blocking unit 60, the light blocking unit 60 is moved to a light blocking position where external light E is blocked before the external light reaches the reading line L, said external light generating, when reflected by the reading line L, reflected light R, i.e., reflected light to be inputted to the CCD 27.

Description

Image reading device

The present invention relates to an image reading apparatus.

Some image reading apparatuses that capture an image of a medium that is a subject at the time of imaging by an imaging apparatus such as a camera, and the like, have an imaging apparatus disposed above the medium and image the medium from above. As described above, when an image is captured using the image reading apparatus, the medium is irradiated from a light source such as a fluorescent lamp or an LED regardless of whether the image reading apparatus has illumination for imaging. External light such as light and natural light is irradiated. However, when external light is irradiated on the medium, depending on the material of the medium, the external light is regularly reflected on the surface of the medium and is incident on the imaging device, so that the quality of the image captured by the imaging device is degraded. There is. For this reason, in the conventional image reading apparatus, in order to prevent the external light regularly reflected by the medium from entering the imaging apparatus, the light irradiated from the outside toward the medium is provided around the imaging apparatus. Some have a light shielding member for shielding light (for example, Patent Document 1).

Japanese Patent No. 3759887

However, when a light shielding member is provided around the imaging device, when the user reads the medium using the image reading device, the light shielding member blocks the user's field of view when the user visually recognizes the medium from above the light shielding member. It will be. For this reason, there is a possibility that the working efficiency at the time of performing the reading work may be significantly lowered. In this way, the deterioration of image quality due to regular reflection of external light on the medium is suppressed without causing deterioration in workability at the time of reading the medium due to the field of view being blocked by the light shielding member. It was very difficult.

The present invention has been made in view of the above, and an image reading apparatus capable of suppressing deterioration in image quality due to regular reflection of external light without reducing workability during reading work. The purpose is to provide.

In order to solve the above-described problems and achieve the object, an image reading apparatus according to the present disclosure captures an image of a part of a mounting surface on which a medium is mounted and includes an imaging element that reads an image; A first actuator that moves the imaging position of the imaging device in one direction; a light-shielding portion that is disposed above the placement surface and shields light; and a second actuator that moves the light-shielding portion in the one direction A control unit that drives and controls at least the second actuator, and the control unit moves the image pickup position by the first actuator in conjunction with the movement of the image pickup position by the image pickup unit. The movement control of the light-shielding part is performed by controlling the movement of the light-shielding part with respect to the outside light that is reflected when the reflected light is reflected at the imaging position and becomes incident on the image sensor. A blocking position for blocking before reaching the position, moving the light shielding portion.

In addition, an image reading apparatus according to the present disclosure captures an image of a part of a placement surface on which a medium is placed, and moves an imaging position of the imaging element in one direction, with an imaging unit having an imaging element that reads the image. A first actuator, a light-shielding part that is disposed above the placement surface and shields light; and a light source for the light-shielding part that is provided in the light-shielding part and emits light to the imaging position during imaging by the imaging unit And a second actuator that moves the light-shielding part and the light source for the light-shielding part in the one direction, and a control unit that drives and controls at least the second actuator, the light source for the light-shielding part at the imaging position The light source that irradiates the imaging position with light so that the reflected reflected light does not enter the imaging element, and the light source that irradiates the imaging position with light is only the light source for the light-shielding unit, and the control unit By department During imaging, the movement of the light shielding part by the second actuator is controlled in conjunction with the movement of the imaging position by the first actuator. The movement control of the light shielding part is performed when reflected at the imaging position. The light-shielding part is moved to a light-shielding position where external light that becomes reflected light incident on the imaging element is shielded before reaching the imaging position.

The image reading apparatus according to the present disclosure has an effect that it is possible to suppress deterioration in image quality due to regular reflection of external light without reducing workability during reading work.

FIG. 1 is a perspective view of the image reading apparatus according to the first embodiment. FIG. 2 is a side view of the image reading apparatus main body shown in FIG. 3 is a perspective view of the image reading apparatus main body shown in FIG. FIG. 4 is a detailed view of the light source. FIG. 5 is a detailed view when the light shielding device is viewed from the rear side in the sub-scanning direction. FIG. 6 is an explanatory diagram of the position of the light shielding portion in the sub-scanning direction. FIG. 7 is a detailed view of the light shielding portion shown in FIG. FIG. 8 is a block diagram illustrating a main configuration of the image reading apparatus according to the first embodiment. FIG. 9 is an explanatory diagram when the medium is pressed by the pressing plate. FIG. 10 is a side view showing a state in which reading of an image on a medium is started by the image reading apparatus. FIG. 11 is a flowchart showing the control procedure of the light shielding device when the image reading device reads an image on a medium. FIG. 12 is an explanatory diagram illustrating a state in which the light shielding unit is moved in conjunction with the movement of the reading target line. FIG. 13 is a block diagram illustrating a main configuration of the image reading apparatus according to the second embodiment. FIG. 14 is a flowchart illustrating a control procedure of the light-shielding device when the image reading device according to the second embodiment reads an image on a medium. FIG. 15 is a block diagram illustrating a main configuration of the image reading apparatus according to the third embodiment. FIG. 16 is a flowchart illustrating a control procedure of the light-shielding device when the image reading device according to the third embodiment reads an image on a medium. FIG. 17 is a perspective view of a modification example of the image reading apparatus 1 according to the first embodiment, in which a shielding portion frame is provided in the light shielding device. FIG. 18 is a side view of a modification of the image reading apparatus 1 according to the first embodiment in the case where a light source is provided in the light shielding portion.

Hereinafter, embodiments of an overhead image reading apparatus according to the present invention will be described in detail with reference to the drawings. In addition, this invention is not limited by this embodiment. In addition, constituent elements in the following embodiments include those that can be easily replaced by those skilled in the art or those that are substantially the same.

[Embodiment 1]
FIG. 1 is a perspective view of the image reading apparatus according to the first embodiment. An image reading apparatus 1 shown in FIG. 1 is an apparatus that reads a medium S placed on a placement surface 2 from above. The image reading device 1 includes an image reading device main body 5 that picks up an image of the medium S and reads the image, and external light is picked up by the image reading device main body 5 when the image reading device main body 5 reads the image. And a light-shielding device 50 that prevents the light from being reflected and incident on the image pickup unit 22 at the image pickup position in FIG. The image reading device main body 5 and the light shielding device 50 are mounted on the mounting surface 2 independently. The mounting surface 2 is a flat surface such as an upper surface of a desk, for example.

FIG. 2 is a side view of the image reading apparatus main body shown in FIG. 3 is a perspective view of the image reading apparatus main body shown in FIG. The image reading device main body 5 includes a casing 10 and an optical unit 20, and can read an image of the medium S placed on the placement surface 2 below the optical unit 20 in the vertical direction. . The housing 10 includes a pedestal 11, an arm 12, a support 13, and a cover 14. The pedestal portion 11 is placed on the placement surface 2 or the like and supports the entire housing 10, and is a base portion of the housing 10. Operation members such as a power switch (not shown) of the image reading apparatus main body 5 and a scan switch 45 (see FIG. 8) that is a switch for instructing start of image reading are disposed on the pedestal 11, for example. The pedestal portion 11 is formed in, for example, a flat shape, and is installed such that the bottom surface 11 d faces the placement surface 2.

For example, the medium S is placed on the mounting surface 2 in such a direction that one side of the medium S faces the front surface 11a which is one of the four surfaces on the side of the pedestal 11 and is parallel to the front surface 11a. Placed. In the description of the image reading apparatus 1 according to the first embodiment, the direction parallel to one side of the front surface 11a of the medium S when the side of the rectangular medium S is placed in a direction parallel to the front surface 11a is referred to as “width direction”. Or “main scanning direction”. In addition, a direction parallel to a side orthogonal to one side on the front surface 11a side of the medium S is referred to as a “depth direction” or a “sub-scanning direction”. That is, the depth direction is a direction in which the user and the image reading apparatus main body 5 face each other when the user faces the image reading apparatus main body 5 with the medium S interposed therebetween. In the depth direction, the direction from the back surface 11c to the front surface 11a is described as front, and the direction from the front surface 11a to the back surface 11c is described as rear. In addition, the back surface 11c is a surface located on the opposite side to the side where the front surface 11a is located in the depth direction among the four surfaces on the side of the pedestal 11.

The arm portion 12 is connected to the pedestal portion 11 and extends upward from the pedestal portion 11 in the vertical direction. The support portion 13 is connected to an end portion in the vertical direction of the arm portion 12 and protrudes forward from the upper end of the arm portion 12 in the sub-scanning direction. Moreover, the support part 13 protrudes from the upper end of the arm part 12 to the both sides of the width direction. That is, the support portion 13 protrudes from the arm portion 12 to the placement side on which the medium S is placed, and extends from the arm portion 12 to both sides in the width direction. For this reason, when the medium S is placed on the placement surface 2 so that one side of the medium S is parallel to the front surface 11 a of the pedestal 11, at least a part of the support portion 13 is mutually perpendicular to the medium S. opposite.

The cover unit 14 covers at least the rotation axis X of the optical unit 20 and covers the support unit 13 and the optical unit 20. The cover portion 14 covers the rotation axis X, the support portion 13 and the optical unit 20 from above in the vertical direction, and forms an outer shell on the top of the housing 10 including the support portion 13 and the optical unit 20. In the description of the image reading apparatus 1 according to the first embodiment, unless otherwise specified, the “radial direction” indicates a radial direction orthogonal to the rotation axis X, and the “view in the axial direction” indicates the rotation axis. An axial view of X shall be indicated.

The optical unit 20 provided in the housing 10 is a rotating unit that can rotate around the rotation axis X with respect to the housing 10. The rotation axis X extends horizontally in the width direction, that is, in a direction parallel to the front surface 11 a of the pedestal portion 11. That is, the rotation axis X is orthogonal to the vertical axis V that coincides with the normal line of the placement surface 2. The optical unit 20 includes a light source 21, an imaging unit 22, a main body 23, a shaft unit 24, and an illumination blocking unit 25. The shaft portion 24 has a substantially cylindrical shape, and is supported rotatably around the rotation axis X by the support portion 13 via a bearing or the like. Since the shaft portion 24 is supported by the support portion 13, the rotation axis X is located at a position protruding from the upper end in the vertical direction of the arm portion 12 to the mounting side with respect to the pedestal portion 11. The main body 23 is connected to the shaft portion 24 and extends from the shaft portion 24 outward in the radial direction of the rotation axis X. For example, the main body 23 is a hollow member having a rectangular cross-sectional shape when viewed in the axial direction, and the light source 21 and the imaging unit 22 are mounted in the main body 23.

The illumination blocker 25 is provided to lower the upper end position of the light emitted from the light source 21 and is connected to the main body 23. Specifically, the illumination blocking unit 25 is located on the opposite side of the main body 23 to the side where the arm unit 12 is located in the sub-scanning direction than the position where the light source 21 is mounted.

A driving device 31 (see FIG. 8), which is a rotation mechanism, is disposed on the support portion 13 constituting the housing 10. The drive device 31 can cause the optical unit 20 to rotate about the rotation axis X and swing by applying a driving force about the rotation axis X to the optical unit 20. The drive device 31 includes, for example, a drive source such as an electric motor, and a transmission unit that connects the rotation shaft of the motor and the optical unit 20. The motor is, for example, a stepping motor, and can accurately control the rotation angle of the optical unit 20. Further, the transmission unit includes, for example, a combination of a pulley, a belt, a worm gear, and the like, and reduces the rotation of the motor and transmits it to the optical unit 20.

FIG. 4 is a detailed view of the light source. The light source 21 includes a light emitting unit 21a such as an LED (Light Emitting Diode), and can irradiate the medium S with light from above in the vertical direction. The light source 21 has a function of irradiating the medium S with slit-shaped light. For example, the light source 21 includes a lens 21b that is disposed below the light emitting unit 21a and can irradiate light in a slit shape. . The light source 21 may include a plurality of illumination modules including the light emitting unit 21a and the lens 21b. For example, illumination modules may be disposed on both sides in the main scanning direction with the imaging unit 22 interposed therebetween.

The lens 21b disposed below the light emitting unit 21a is formed of a transparent member having a curved surface that is convex downward and curved. This lens 21b changes the direction of the light into a slit shape that is narrow in the sub-scanning direction and widens in the main scanning direction when light from the light emitting portion 21a disposed above the lens 21b is transmitted. Irradiate in the direction of.

The light source 21 and the imaging unit 22 are arranged so as to overlap in the axial direction view. More specifically, the optical axis A1 of the light source 21 and the optical axis A2 of the imaging unit 22 overlap in the axial direction and are coaxial. The light source 21 and the imaging unit 22 are disposed on the same virtual line W extending radially outward from the rotation axis X. For example, when a radial line connecting the rotation axis X and a light receiving surface 27a of the CCD 27 described later is drawn as the virtual line W, the light source 21 is disposed on the virtual line W.

The imaging unit 22 is an image sensor having a CCD (Charge Coupled Device), for example, and can image the medium S placed on the placement surface 2 of the optical unit 20 on the lower side in the vertical direction from above. Yes. Specifically, the imaging unit 22 converts the reflected light reflected by the read image on the reading target line L that is the imaging position and incident on the imaging unit 22 into electronic data by photoelectric conversion, and image data of the read image Can be generated. The imaging unit 22 includes a reading lens 26 and a CCD 27. The CCD 27 is an image sensor that reads an image, and is a line sensor in which a plurality of pixels that read an image are arranged in the main scanning direction. The CCD 27 is disposed in the optical unit 20 with the main scanning direction being parallel to the rotation axis X. The reading lens 26 images the reflected light from the medium S on the light receiving surface 27 a of the CCD 27. Each pixel of the CCD 27 receives the light of the read image formed on the light receiving surface 27a by the reading lens 26, and outputs an electric signal corresponding to the received light. The CCD 27 can read an image on the reading target line L of the medium S and generate line image data in the main scanning direction. That is, the CCD 27 that is a line sensor can image a part of the mounting surface 2. The number of lines of the CCD 27 may be singular or plural.

The light source 21 is disposed so as to be able to irradiate light onto the medium S during imaging by the imaging unit 22, and irradiates the image on the reading target line L on the medium S, that is, the scanned image with light. The light source 21 is adjusted so that the irradiation light spreads at a predetermined angle with respect to the optical axis A1. This angle is determined so that the width of the irradiation light on the medium S in the sub-scanning direction becomes a predetermined value. The light source 21 is adjusted so that the irradiation light can spread from one end to the other end of the medium S in the main scanning direction.

The light shielding device 50 (see FIG. 1) placed on the placement surface 2 together with the image reading device main body 5 configured as described above is configured to place the medium S placed on the placement surface 2 from above. A pressing plate 55 that presses toward the side, a pressing plate support portion 51 that supports the pressing plate 55 so as to be openable and closable with respect to the mounting surface 2, and a light shielding portion 60 that prevents the reflected light from entering the imaging unit 22. is doing. In the following description, the main scanning direction of the image reading apparatus main body 5 in the normal usage pattern when the light shielding apparatus 50 is used together with the image reading apparatus main body 5 will be described as the main scanning direction also in the light shielding apparatus 50. The sub-scanning direction of the apparatus body 5 will be described as the sub-scanning direction in the light shielding device 50 as well.

The shading device 50 is formed so that the pressing plate 55 is positioned on the front side of the image reading device main body 5 in the sub-scanning direction of the image reading device main body 5 in the usage form of the image reading device 1 used together with the image reading device main body 5. Has been. As described above, the pressing plate 55 located on the front side in the sub-scanning direction is disposed between the placement surface 2 and the light shielding portion 60, and has a substantially rectangular plate shape, a transparent resin material, or the like. The transmission part 56 having transparency by being made of, and the frame part 57 provided around the transmission part 56 are configured.

The transmission portion 56 is formed in a rectangular shape larger than the reading range when the medium S placed on the placement surface 2 is read by the image reading apparatus body 5. The frame portion 57 provided around the transmission portion 56 is provided as a reinforcing member that reinforces the transmission portion 56 formed in a plate shape. One side of the rectangular four sides of the pressing plate 55 is rotatably connected to the pressing plate support portion 51. Thus, the pressing plate 55 that is rotatably connected to the pressing plate support portion 51 can be in a state parallel to the placement surface 2, and the medium S is placed on the placement surface 2. In this state, the medium S can be pressed from above by being parallel to the placement surface 2 above the medium S.

Further, a handle 58 is provided in a portion corresponding to a side located on the side opposite to the side connected to the pressing plate support portion 51 in the frame portion 57 of the pressing plate 55. The handle 58 is provided so as to protrude upward from the frame portion 57 in a state where the pressing plate 55 is parallel to the placement surface 2, and when the user rotates the pressing plate 55 with respect to the pressing plate support portion 51. In addition, it is a part that can be grasped by hand.

Further, the light shielding part 60 is disposed above the pressing plate 55, whereby the light shielding part 60 is disposed above the placement surface S. The light shielding portion 60 is made of a non-translucent material and is formed to have a predetermined height in the vertical direction, and in a direction along the side where the pressing plate 55 is connected to the pressing plate support portion 51. It is formed as an elongated member that extends. That is, the light shielding unit 60 has a predetermined height and extends in the main scanning direction.

The light shielding portion 60 is movable between the side where the pressing plate support portion 51 is located and the side where the handle 58 is located, and above the pressing plate 55 is a carrier that regulates the moving direction of the light shielding portion 60. A shaft 73 is disposed. The carrier shafts 73 are disposed at both ends in the main scanning direction above the holding plate 55, and are formed in an axial shape extending in the sub scanning direction. The light shielding portion 60 is connected to the carrier shaft 73 so as to be movable in the axial direction of the carrier shaft 73, and thus the light shielding portion 60 moves along the carrier shaft 73 above the pressing plate 55. Is possible.

FIG. 5 is a detailed view when the light shielding device is viewed from the rear side in the sub-scanning direction. The light shielding device 50 is provided with a drive mechanism 70 that can move the light shielding portion 60 along the carrier axis 73 in the sub-scanning direction. The drive mechanism 70 includes a motor 71 that is a second actuator that moves the light shielding unit 60 in one direction, and a timing belt 72 that transmits the power generated by the motor 71 to the light shielding unit 60. As the motor 71, for example, a stepping motor capable of accurately controlling the rotation angle is used. The motor 71 is disposed at a position near one end in the main scanning direction near the portion of the pressing plate 55 connected to the pressing plate support portion 51.

The timing belt 72 is disposed on both sides of the pressing plate 55 in the main scanning direction on the side where the motor 71 is disposed. It is wound between a pair of pulleys arranged near both ends in the scanning direction. For this reason, the timing belt 72 is provided in a state in which a portion positioned on the upper side of the pulley and a portion positioned on the lower side of the pulley both extend in the sub-scanning direction and are aligned in parallel in the vertical direction.

The motor 71 can transmit power to a pulley disposed on the end side of the pair of pulleys on the side where the presser plate support portion 51 is located. 72 can be rotated between pulleys by the power generated by the motor 71. The light shielding part 60 is connected to the upper part of the part of the timing belt 72 arranged in the vertical direction. For this reason, when the timing belt 72 rotates, the light shielding unit 60 can move in one direction on the holding plate 55 along with the movement of the upper portion of the timing belt 72. Specifically, the light shielding unit 60 60 is movable in the sub-scanning direction.

The pressing plate 55 is connected to the pressing plate support 51 in the vicinity of the end on the side where the motor 71 is located in the sub-scanning direction by a rotation fulcrum 52 so as to be rotatable. The rotation fulcrum 52 is provided as a rotation axis whose axial direction extends in the main scanning direction, and the pressing plate 55 is rotatable about the rotation fulcrum 52 so as to be rotatable with respect to the pressing plate support 51. It has become.

Further, a position sensor 75 for detecting the position of the light shielding unit 60 is disposed in the vicinity of the pulley on the side where the power from the motor 71 is transmitted among the pair of pulleys around which the timing belt 72 is wound. The position sensor 75 includes non-contact detection means such as an infrared sensor and a proximity switch, and detection means for detecting the light shielding part 60 by contacting the light shielding part 60, and the position of the light shielding part 60 in the sub-scanning direction is predetermined. It is possible to detect whether or not the position is.

Further, the holding plate support 51 is provided with an illuminance sensor 53 for detecting the illuminance of the light irradiated on itself. The illuminance sensor 53 is disposed in the vicinity of the position where the image reading apparatus main body 5 is disposed in the holding plate support 51. That is, the image reading when the light shielding device 50 is used together with the image reading apparatus main body 5. It is disposed near the pedestal 11 of the apparatus body 5. Specifically, the illuminance sensor 53 is disposed at a position where light emitted from the light source 21 of the optical unit 20 is irradiated when the image reading in the image reading apparatus body 5 is started. 51 on the optical axis A1 of the light source 21 at the start of reading by the image reading apparatus main body 5. In other words, in the illuminance sensor 53, the optical unit 20 is disposed on the optical axis A1 of the light source 21 in a state of the last reading position described later.

FIG. 6 is an explanatory diagram regarding the position of the light shielding portion in the sub-scanning direction. The light shielding unit 60 is provided as a member for shielding external light E such as light emitted from an illumination 85 provided in a room where the image reading apparatus 1 is installed. Specifically, the light-shielding unit 60 reads the external light E, which is reflected light R that is incident on the CCD 27 (see FIG. 2) of the image reading apparatus main body 5 when the reflected light R is reflected by the reading target line L. It is a member that shields light before reaching the line L. That is, the light-shielding unit 60 reflects the reflected light R when the external light E applied to the reading target line L is regularly reflected on the surface of the transmission unit 56 of the medium S or the pressing plate 55. The external light E, which is the reflected light R that substantially coincides with the optical axis A2 of the imaging unit 22 that is included, is shielded before reaching the reading target line L.

Specifically, in the light shielding unit 60, the angle of the optical axis A2 of the imaging unit 22 with respect to the orthogonal axis C orthogonal to the surface of the medium S or the pressing plate 55 at the position of the reading target line L is θ (y). In this case, the external light E incident on the reading target line L from the front side in the sub-scanning direction at an angle θ (y) can be prevented from reaching the reading target line L. . Note that the angle θ (y) of the optical axis A2 of the imaging unit 22 with respect to the orthogonal axis C and the angle θ (y) of the external light E are both angles in the sub-scanning direction (y) with respect to the orthogonal axis C. ing.

FIG. 7 is a detailed view of the light shielding portion shown in FIG. The light shielding unit 60 has a shape that allows the reflected light R when reflected by the reading target line L out of the external light E irradiated to the reading target line L to block the external light E that becomes reflected light incident on the CCD 27. It is formed with. That is, the light shielding unit 60 is formed in a shape that can block such external light E from reaching the reading target line L. Specifically, for the height h2 from the medium S to the upper end 62 of the light shielding unit 60, the distance from the light shielding unit 60 to the reading target line L in the sub-scanning direction is d, and the thickness of the pressing plate 55, that is, the transmission When the thickness of the portion 56 is g, h2> [{d + g. tan θ (y)} / tan θ (y) + g].

In addition, g. tan θ (y) is a distance in the sub-scanning direction from the position of the reading target line L on the medium S when the external light E is reflected light R which is regularly reflected on the surface of the transmission unit 56 and enters the CCD 27. It has become. The light shielding portion 60 has a height h2 from the medium S to the upper end 62 of the light shielding portion 60 such that h2> [{d + g. tan θ (y)} / tan θ (y) + g] is formed at a height that satisfies the relationship: tan θ (y)} / tan θ (y) + g], thereby preventing outside light E from reaching the reading target line L through the upper end 62 of the light shielding unit 60. It is possible to be formed.

Further, the height h1 from the medium S to the lower end 61 of the light shielding unit 60 is a height that satisfies the relationship g <h1 <{d / tan θ (y)}. The light shielding portion 60 is formed such that the height h1 from the medium S to the lower end 61 of the light shielding portion 60 satisfies the relationship g <h1 <{d / tan θ (y)}, so that the external light E is generated. It is formed so as to be able to prevent the reading target line L from reaching through the lower end 61 of the light shielding unit 60.

FIG. 8 is a block diagram illustrating a main configuration of the image reading apparatus according to the first embodiment. Of the image reading device main body 5 and the light shielding device 50 constituting the image reading device 1 according to the first embodiment, the image reading device main body 5 includes a control unit 30, and the control unit 30 executes various processes. A computer (Central Processing Unit) that functions as a controller, a RAM (Random Access Memory) that functions as a memory that stores various information, a ROM (Read Only Memory), and the like. All or part of each function of the control unit 30 is realized by reading and writing data in the RAM or ROM by loading an application program held in the ROM into the RAM and executing it by the CPU. .

The control unit 30 has a function of controlling the light source 21, the imaging unit 22, and the driving device 31 when reading an image. The control unit 30 is connected to the light source 21, the imaging unit 22, the driving device 31, and the scan switch 45 via the input / output interface unit 33. The control unit 30 can be connected to an external device 40 such as a PC (Personal Computer) or an information terminal via the input / output interface unit 33. The image reading apparatus main body 5 can be controlled by the external device 40, for example, a function of reading the medium S in response to an input operation to the scan switch 45 or a reading command from the external device 40, or the read medium S The image data is output to the external device 40.

The control unit 30 can control the turning on / off of the light source 21 by adjusting the power supply to the light source 21. Further, the control unit 30 may have a function of controlling the light emission amount of the light source 21. The control unit 30 turns on the light source 21 when the image capturing unit 22 reads an image, and irradiates the reading target line L with light. Further, the control unit 30 can drive the imaging unit 22 to read the medium S and acquire the image data generated by the imaging unit 22.

The control unit 30 can control the driving device 31 to swing the optical unit 20 around the rotation axis X. The driving device 31 is provided as a first actuator that moves the reading target line L, which is the imaging position of the CCD 27, in one direction. Specifically, the driving device 31 moves the reading target line L in the sub-scanning direction. The optical unit 20 can be swung in the direction of movement. The control unit 30 can read the line image using the arbitrary position in the sub-scanning direction on the medium S as the reading target line L by adjusting the rotational position of the optical unit 20 around the rotation axis X. Yes.

The image reading apparatus main body 5 can acquire the image data of the entire medium S by repeating the acquisition of the line image data and the position adjustment of the reading target line L by rotating the optical unit 20. Yes. In other words, the image reading apparatus main body 5 scans the medium S when the irradiation light of the light source 21 scans the original surface in the sub-scanning direction and the image of the reading target line L irradiated with the light is read by the imaging unit 22. It is possible to generate images. For example, the image reading apparatus main body 5 generates the two-dimensional image data of the medium S by reading the line image of each reading target line L while sequentially moving the position of the reading target line L from the rear to the front in the depth direction. be able to.

In the image reading apparatus main body 5 according to the first embodiment, the imaging unit 22 rotates together with the optical unit 20, and scans and images the medium S while rotating around the rotation axis X about the rotation axis X. . Thereby, the fluctuation | variation of the optical path length with the imaging part 22 and the reading target line L which is an imaging position is suppressed. Further, the light shielding device 50 has a control unit 80, and the illuminance sensor 53, the motor 71, and the position sensor 75 are electrically connected to the control unit 80. Therefore, the detection results of the illuminance sensor 53 and the position sensor 75 can be transmitted to the control unit 80, and the motor 71 is driven by the control signal transmitted from the control unit 80 to drive the light shielding unit 60. It can be moved.

The control unit 80 is a computer having an MPU (Micro Processing Unit) 81 used as a CPU that functions as a controller that executes various processes, and a RAM and a ROM that function as memories that store various types of information. All or part of each function of the control unit 80 is realized by reading and writing data in the RAM or ROM by loading an application program held in the ROM into the RAM and executing it by the MPU 81. . The control unit 80 controls the operation of the light shielding device 50 when reading an image with the image reading device body 5 by controlling the driving of the motor 71 based on the detection results of the illuminance sensor 53 and the position sensor 75. It is possible.

The image reading apparatus 1 according to the first embodiment is configured as described above, and the operation thereof will be described below. FIG. 9 is an explanatory diagram when the medium is pressed by the pressing plate. In the image reading apparatus 1, the image reading apparatus main body 5 and the light shielding device 50 are detachable. Therefore, the housing 10 of the image reading apparatus main body 5 is detachable with respect to the light shielding device 50, and is detachable with respect to the light shielding portion 60, the motor 71 and the like of the light shielding device 50. Therefore, when reading the image of the medium S using the image reading device 1, the image reading device main body 5 and the light shielding device 50 are both placed on the placement surface 2. The orientation of the image reading apparatus main body 5 with respect to the arm portion 12 is such that the direction in which the support portion 13 protrudes and the direction in which the pressing plate 55 is positioned with respect to the pressing plate support portion 51 are the same. 22 is placed in a positional relationship where the pressing plate 55 is positioned on the reading target line L.

When reading the image of the medium S using the image reading device 1 on which the image reading device main body 5 and the light shielding device 50 are placed in this way, first, the presser plate 55 of the light shielding device 50 is raised upward and pressed. The plate 55 is separated from the placement surface 2. That is, for example, when the user grasps the handle 58 of the presser plate 55 and lifts the handle 58 upward, the presser plate 55 is rotated with respect to the presser plate support portion 51 around the rotation fulcrum 52, and the presser plate 55 is moved. It is spaced apart from the mounting surface 2 upward.

When the pressing plate 55 is separated upward from the mounting surface 2, the medium S for reading an image is mounted below the pressing plate 55 on the mounting surface 2 so that the surface on the image reading side becomes the upper surface side. . When the medium S is placed on the placement surface 2, the pressing plate 55 is lowered by rotating the pressing plate 55 around the rotation fulcrum 52. Accordingly, the medium S placed on the placement surface 2 is sandwiched between the placement surface 2 and the pressing plate 55. In other words, the medium S placed on the placement surface 2 is pressed from above by the pressing plate 55.

FIG. 10 is a side view showing a state in which reading of an image on a medium is started by the image reading apparatus. When the medium S is sandwiched between the placement surface 2 and the pressing plate 55, the user performs an input operation on the scan switch 45 provided in the image reading apparatus main body 5, whereby the image reading apparatus main body 5 is moved to the image. Start reading operation. When the image reading device main body 5 starts reading an image of the medium S placed on the placement surface 2, the rotation position of the optical unit 20 is such that the optical axis A1 of the light source 21 and the optical axis A2 of the imaging unit 22 are aligned. Both of these are rotational positions that are closer to the back surface 11c than the front surface 11a of the pedestal 11 in the sub-scanning direction.

In the following description, this rotational position of the optical unit 20 is also described as “last reading position”. The last reading position is also a standby position of the optical unit 20, and this standby position is a rotation position of the optical unit 20 when the imaging unit 22 does not read the medium S. That is, when the image is not read, the optical unit 20 is placed at the last reading position and waits until an image read start command is issued. Note that the standby position may be a position different from the last reading position, and the optical unit 20 rotates after an instruction to start reading an image is issued by performing an input operation on the scan switch 45. The rotation position may be configured to be the last reading position.

When the reading of the medium S is started from the state in which the optical unit 20 is at the rearmost reading position, first, the drive device 31 of the image reading device body 5 controls the optical unit 20 to control the light source. 21 is turned on, irradiated with irradiation light, and energized to the CCD 27 to prepare for the imaging unit 22 to read an image. After a predetermined time has passed in this state, the drive unit 31 is operated to rotate the optical unit 20 around the rotation axis X (see FIG. 2) in the delivery direction Y1. As a result, the inclination angle θ1 of the optical axis A1 of the light source 21 and the optical axis A2 of the imaging unit 22 with respect to the vertical axis V increases, and both the optical axis A1 of the light source 21 and the optical axis A2 of the imaging unit 22 are sub-scanned. Move forward in the direction.

On the other hand, when the light shielding device 50 reads an image with the image reading device main body 5, the reflected light R of the external light E reflected by the reading target line L is directed toward the imaging unit 22 of the image reading device main body 5. The light shielding unit 60 is moved to a position where the outside light E can be shielded so as not to go. When the image is read by the image reading apparatus main body 5, the optical unit 20 rotates while reading, and accordingly the image reading apparatus main body 5 also moves the light shielding unit 60.

FIG. 11 is a flowchart showing a control procedure of the light-shielding device when the image reading device reads an image on a medium. The movement control of the light shielding unit 60 in the light shielding device 50 when an image is read by the image reading device main body 5 will be described. When the image reading device main body 5 is waiting for an input operation to the scan switch 45, the light shielding device 50 The home position of the light shielding unit 60 is detected (step ST11). Note that the home position here is such that when the rotation position of the optical unit 20 is the rearmost reading position, the distance d of the light shielding unit 60 to the reading target line L by the optical axis A2 of the imaging unit 22 is h2> [{ d + g. tan θ (y)} / tan θ (y) + g] and a position where the distance can satisfy both the relationship of g <h1 <{d / tan θ (y)}.

Whether the light shielding unit 60 is at the home position is detected by detecting the position of the light shielding unit 60 in the sub-scanning direction with the position sensor 75. The detection result of the position sensor 75 is transmitted to the control unit 80, and when the light shielding unit 60 is located at the home position, it waits in that state.

On the other hand, when the detection result of the position sensor 75 indicates that the position of the light shielding unit 60 is not the home position, the control unit 80 moves the light shielding unit 60 in the direction in which the light shielding unit 60 approaches the home position. Thus, the motor 71 of the drive mechanism 70 is operated. When the motor 71 is operated, the power of the motor 71 is transmitted to the timing belt 72 so that the timing belt 72 rotates. Therefore, the light shielding unit 60 moves in the sub-scanning direction as the timing belt 72 rotates. To do. Thus, the light shielding unit 60 moves to the home position and stands by in this state.

The control unit 80 of the light shielding device 50 determines whether or not the illuminance sensor 53 is ON in the state where the light shielding unit 60 is located at the home position (step ST12). Specifically, the illuminance sensor 53 normally outputs an OFF signal to the control unit 80, and detects the illuminance to the extent that the light emitted from the light source 21 of the optical unit 20 is emitted to the illuminance sensor 53. When this occurs, an ON signal is output. Since the illuminance sensor 53 is disposed at a position where the light emitted from the light source 21 of the optical unit 20 at the last reading position can be detected, when the illuminance sensor 53 outputs an ON signal, the image reading is performed. It can be determined that the apparatus body 5 has started reading an image.

When the illuminance sensor 53 provided in this way is not ON (step ST12, No determination), this determination is repeated until the illuminance sensor 53 is turned on and waits. If the control unit 80 determines that the illuminance sensor 53 has been turned on based on a signal transmitted from the illuminance sensor 53 to the control unit 80 (step ST12, Yes determination), a specified time is delayed (step ST13). That is, at the start of image reading by the image reading device main body 5, since the optical unit 20 rotates after a lapse of a predetermined time after the light source 21 is turned on and irradiation of irradiation light is started, the light shielding device 50 is The same time as the predetermined time is set as the specified time, and the operation is delayed for the specified time to wait.

When the designated time is delayed, the control unit 80 causes the motor 71 to rotate forward with the designated pulse (step ST14). Note that the normal rotation in this case is rotation in a direction in which the light shielding unit 60 is moved forward in the sub-scanning direction. The control unit 80 of the light shielding device 50 can perform movement control of the light shielding unit 60 by the motor 71 in conjunction with the movement of the reading target line L by the driving device 31 during imaging by the imaging unit 22.

FIG. 12 is an explanatory diagram showing a state in which the light shielding portion is moved in conjunction with the movement of the reading target line. Specifically, when reading the image of the medium S, the image reading apparatus main body 5 captures the reading target line L irradiated with the light emitted from the light source 21 with the imaging unit 22 while imaging the optical axis of the light source 21. The optical unit 20 is rotated in a direction in which both A1 and the optical axis A2 of the imaging unit 22 are moved from the rear side to the front side in the sub-scanning direction. At that time, since the pressing plate 55 that presses the medium S presses the medium S by the transmission part 56, the light emitted from the light source 21 passes through the transmission part 56 and is applied to the medium S. The imaging unit 22 captures the reading target line L by receiving the light transmitted through the transmission unit 56 from the medium S side by the CCD 27. As described above, the image reading apparatus main body 5 rotates the optical unit 20 in the direction in which the reading target line L is moved forward in the sub-scanning direction while imaging the reading target line L, thereby scanning the medium S with the main scanning. Reading in the two-dimensional direction of the direction and the sub-scanning direction. The image reading device main body 5 transmits the image read in the two-dimensional direction to the external device 40, and the external device 40 stores the image data transmitted from the image reading device main body 5 in the external device 40 (not shown). ) To save.

The light shielding device 50 moves the light shielding unit 60 in the sub-scanning direction in conjunction with the image reading device body 5 that reads an image while moving the reading target line L in the sub-scanning direction in this way. In the movement control of the light shielding unit 60 in the light shielding device 50, the external light E, which is reflected light incident on the CCD 27 when reflected by the reading target line L, is shielded before reaching the reading target line L. The light shielding unit 60 is moved to the light shielding position. That is, the light shielding device 50 has a distance d of the light shielding unit 60 with respect to the moving reading target line L such that h2> [{d + g. tan θ (y)} / tan θ (y) + g] and the read target line L so that the distance becomes a distance that can satisfy both the relationship g <h1 <{d / tan θ (y)}. The light shielding unit 60 is moved to the front side in the sub-scanning direction in accordance with the movement.

In other words, the light shielding device 50 moves the reading speed L of the scanning target line L with the light shielding portion 60 positioned slightly forward in the sub-scanning direction with respect to the scanning target line L that moves forward in the sub-scanning direction. y) The light shielding portion 60 is moved at the same moving speed V (y) as that (see FIG. 6). Thereby, the light-shielding unit 60 becomes the reflected light that is incident on the CCD 27, regardless of the rotational position of the optical unit 20 that is rotated to move the read target line L. The external light E can be shielded before reaching the reading target line L.

The control unit 80 has a designated pulse that can operate the motor 71 to move the light shielding unit 60 at the same movement speed V (y) as the movement speed V (y) of the reading target line L on the placement surface 2. Is stored in advance, and the motor 71 is operated with this designated pulse when the light shielding unit 60 is moved in accordance with the reading target line L. As a result, the light shielding unit 60 moves in the sub-scanning direction slightly forward of the reading target line L in the sub-scanning direction at the same moving speed V (y) as the moving speed V (y) of the reading target line L.

When the image reading device main body 5 rotates the optical unit 20 until the reading target line L is positioned at the front end of the moving range in the sub-scanning direction, the control unit 30 of the image reading device main body 5 determines that the reading target line L is the sub-scanning line L. The optical unit 20 is rotated in the direction of moving from the front side to the rear side in the scanning direction. Accordingly, the control unit 80 of the light shielding device 50 rotates the motor 71 in the reverse direction with the designated pulse (step ST15). That is, the control unit 80 operates the motor 71 in the direction in which the light shielding unit 60 moves from the front side to the rear side. As a result, the light shielding unit 60 is moved to the home position, and the light shielding unit 60 waits at the home position until the next reading is performed by the image reading apparatus body 5.

In the image reading device 1 according to the first embodiment described above, the light shielding unit 60 is provided with the light shielding unit 60, and when the medium S is imaged by the image reading device main body 5, the reflected light of the external light E on the reading target line L. Since the light-shielding part 60 is moved so that R does not enter the CCD 27, it is possible to suppress deterioration in the quality of the captured image. In addition, since the light shielding unit 60 is disposed on the placement surface 2 in the vicinity of the placement surface 2, it is possible to prevent the user's view from being obstructed when the medium S is read. As a result, it is possible to suppress deterioration in image quality due to regular reflection of the external light E without reducing workability during the reading operation.

In addition, the medium S is pressed to the placement surface 2 side and has a pressing plate 55 having transparency, and the light shielding unit 60 moves on the pressing plate 55 in the same direction as the moving direction of the reading target line L. In addition, it is possible to suppress the incidence of the reflected light R on the CCD 27 when the external light E is regularly reflected while capturing the medium S clearly. As a result, it is possible to suppress a decrease in image quality due to regular reflection of the external light E and to obtain a higher quality image.

Further, since the pressing plate 55 is provided with a pressing plate support portion 51 that supports the pressing plate 55 so as to be openable and closable with respect to the mounting surface 2, when pressing the medium S with the pressing plate 55, the pressing plate 55 is opened and closed. The medium S can be disposed between the plate 55 and the placement surface 2. As a result, workability in the case where the pressing plate 55 is provided can be improved.

In addition, the imaging unit 22 and the driving device 31 used for imaging the medium S are provided in the housing 10 of the image reading device main body 5 placed on the placement surface 2. Since it is detachable with respect to the light shielding part 60 and the motor 71 used for light shielding, it can be made compact when the image reading apparatus 1 is not used. As a result, the usability of the image reading apparatus 1 can be improved.

Further, the height h2 up to the upper end 62 of the light-shielding part 60 is considered in consideration of the thickness g of the transmission part 56, and h2> [{d + g. tan θ (y)} / tan θ (y) + g] is defined so as to satisfy the relationship, so that when the reflected light R blocks the external light E that becomes the reflected light incident on the CCD 27, External light E that is reflected by the surface of the transmitting portion 56 and becomes reflected light that enters the CCD 27 can also be shielded. Thereby, the regular reflection light with respect to CCD27 can be suppressed more reliably. As a result, it is possible to more reliably suppress deterioration in image quality due to regular reflection of the external light E.

Further, since the light shielding device 50 moves the light shielding unit 60 based on the illuminance detected by the illuminance sensor 53, the image reading device main body is not provided between the image reading device main body 5 and the light shielding device 50. The light shielding unit 60 can be moved in conjunction with the reading operation in FIG. As a result, it is possible to suppress deterioration in image quality due to regular reflection of the external light E with a simple configuration.

[Embodiment 2]
The image reading device 1 according to the second embodiment has substantially the same configuration as the image reading device 1 according to the first embodiment, but is characterized in that the light shielding device 50 operates based on a signal from the image reading device body 5. is there. Since other configurations are the same as those of the first embodiment, the description thereof is omitted and the same reference numerals are given.

FIG. 13 is a block diagram illustrating a main configuration of the image reading apparatus according to the second embodiment. Similar to the image reading apparatus 1 according to the first embodiment, the image reading apparatus 1 according to the second embodiment includes an image reading apparatus main body 5 and a light shielding device 50. Among these, the image reading apparatus main body 5 includes a control unit 30. Based on an input operation to the scan switch 45, the control unit 30 drives the light source 21, the imaging unit 22, and the drive via the input / output interface unit 33. The device 31 can be controlled. Thereby, the image reading apparatus main body 5 can read the medium S while rotating the optical unit 20. Further, the light shielding device 50 also includes a control unit 80, and the light shielding unit 60 can be moved by controlling the motor 71, and the motor 71 is controlled based on the detection result of the position sensor 75. The light shielding unit 60 can be positioned at the home position.

In the image reading apparatus 1 according to the second embodiment, when an input operation is performed on the scan switch 45 of the image reading apparatus body 5, the image reading apparatus body 5 not only starts the operation of the optical unit 20, The scan signal is configured to be transmitted to the light shielding device 50. For this reason, at least the light shielding device 50 is configured to be able to receive a signal transmitted from the image reading device body 5. Transmission / reception of signals between the image reading device main body 5 and the light shielding device 50 may be performed by wireless communication. The image reading device main body 5 and the light shielding device 50 are connected by an electrical contact or using codes. Or may be performed by electrical connection.

The image reading apparatus 1 according to the second embodiment is configured as described above, and the operation thereof will be described below. When the image reading device 1 according to the second embodiment reads an image on the medium S, the image reading device 1 according to the first embodiment places the image on the placement surface 2 as in the case of reading the image on the medium S. The medium S is read by the image reading device main body 5 while being pressed by the pressing plate 55 of the light shielding device 50. In order to read an image with the image reading apparatus main body 5, when the user performs an input operation on a scan switch 45 provided in the image reading apparatus main body 5, the image reading apparatus main body 5 starts a reading operation. At that time, a scan signal is transmitted from the image reading apparatus main body 5 to the light shielding device 50, and the light shielding device 50 operates based on the scan signal.

FIG. 14 is a flowchart showing a control procedure of the light shielding device when the image reading device according to the second embodiment reads an image on a medium. The movement control of the light shielding unit 60 in the light shielding device 50 when the image reading device main body 5 according to the second embodiment reads an image will be described. When the image reading device main body 5 is waiting for an input operation to the scan switch 45, The light shielding device 50 detects the home position of the light shielding unit 60 (step ST11). The light shielding device 50 positions the light shielding unit 60 at the home position by operating the motor 71 by the control unit 80 based on the detection of the home position by the position sensor 75.

Next, it is determined whether or not there is a scan signal (step ST21). That is, the control unit 80 determines whether or not a scan signal transmitted from the image reading apparatus main body 5 has been received. If it is determined by this determination that there is no scan signal (No determination at step ST21), this determination is repeated until there is a scan signal, and the process waits.

If it is determined by the control unit 80 that there is a scan signal (step ST21, Yes determination), it is determined that an input operation has been performed on the scan switch 45 of the image reading apparatus body 5, and the specified time Delay (step ST13). That is, the image reading apparatus main body 5 waits until the optical unit 20 is actuated to start reading, and when the specified time has elapsed, the control unit 80 rotates the motor 71 forward with the specified pulse (step ST14). As a result, the moving speed V (y) of the reading target line L is determined in a state where the light shielding unit 60 is positioned slightly forward in the sub-scanning direction with respect to the reading target line L moving in the sub-scanning direction. Move at the same moving speed V (y).

The operation for reading the medium S in the image reading device main body 5 is completed, and the image reading device main body 5 starts to rotate the optical unit 20 in the direction of moving the reading target line L from the front side to the rear side in the sub-scanning direction. Then, the control part 80 of the light-shielding apparatus 50 reversely rotates the motor 71 with a designated pulse (step ST15). As a result, the light shielding unit 60 is moved to the home position, and the light shielding unit 60 waits at the home position until the next reading is performed by the image reading apparatus body 5.

Since the image reading apparatus 1 according to the second embodiment uses the scan signal transmitted from the image reading apparatus body 5 as a trigger for moving the light shielding unit 60 by the light shielding device 50, the light shielding unit 60 is The image reading apparatus body 5 can be moved in accordance with the reading operation more reliably. As a result, it is possible to more reliably suppress the deterioration of the image quality caused by the regular reflection of the external light E without reducing the workability during the reading operation.

[Embodiment 3]
The image reading apparatus 1 according to the third embodiment has substantially the same configuration as the image reading apparatus 1 according to the first embodiment, but the image reading apparatus main body 5 starts a reading operation based on a signal from the light shielding device 50. There is a feature. Since other configurations are the same as those of the first embodiment, the description thereof is omitted and the same reference numerals are given.

FIG. 15 is a block diagram illustrating a main configuration of the image reading apparatus according to the third embodiment. Similar to the image reading apparatus 1 according to the first embodiment, the image reading apparatus 1 according to the third embodiment includes an image reading apparatus body 5 and a light shielding device 50. The image reading apparatus body 5 includes a scan switch. The light source 21, the imaging unit 22, and the driving device 31 can be controlled by the control unit 30 based on an input operation or the like to 45. Thereby, the image reading apparatus main body 5 can read the medium S while rotating the optical unit 20. Further, the light shielding device 50 also includes a control unit 80, and the light shielding unit 60 can be moved by controlling the motor 71, and the motor 71 is controlled based on the detection result of the position sensor 75. The light shielding unit 60 can be positioned at the home position.

In the image reading apparatus 1 according to the third embodiment, the light shielding device 50 is provided with an open / close switch 90 that detects opening / closing of the presser plate 55. The open / close switch 90 is provided on the presser plate support 51 as a switch for detecting the mechanical movement of the presser plate 55, for example, and the detection result can be transmitted to the control unit 80. When the opening / closing switch 90 detects the opening / closing of the holding plate 55, the light shielding device 50 transmits a scan start signal for starting the reading operation by the image reading device body 5 to the image reading device body 5. It is configured. For this reason, at least the light shielding device 50 is configured to be able to transmit a scan start signal to the image reading device main body 5. Transmission / reception of signals between the image reading device main body 5 and the light shielding device 50 may be performed by wireless communication. The image reading device main body 5 and the light shielding device 50 are connected by an electrical contact or using codes. Or may be performed by electrical connection.

The image reading apparatus 1 according to the third embodiment is configured as described above, and the operation thereof will be described below. When the image reading device 1 according to the third embodiment reads an image on the medium S, when the pressing plate 55 of the light shielding device 50 is opened and closed, the light shielding device 50 issues a scan trigger, and the scan trigger reads the image. When the image is received by the apparatus main body 5, the image reading apparatus main body 5 performs a reading operation. That is, when the image of the medium S is read by the image reading apparatus main body 5, the user opens the pressing plate 55 of the light shielding device 50, mounts the medium S on the mounting surface 2, and closes the pressing plate 55. . At that time, the shading device 50 acquires the opening / closing of the pressing plate 55 by the opening / closing switch 90 and detects that the pressing plate 55 is closed after being opened.

The control unit 80 of the light shielding device 50 that has received a signal indicating that the pressing plate 55 has been closed after being opened issues a scan trigger and transmits it to the input / output interface unit 33 of the image reading device body 5. The image reading apparatus body 5 starts the reading operation when receiving this scan trigger. When one reading operation is completed, the image reading apparatus main body 5 stands by until the next scan trigger is transmitted from the light shielding device 50. When the scan trigger is transmitted from the light shielding device 50, the image reading device body 5 performs the reading operation again.

FIG. 16 is a flowchart illustrating a control procedure of the light shielding device when the image reading device according to the third embodiment reads an image on a medium. The movement control of the light shielding unit 60 in the light shielding device 50 when the image reading device body 5 according to the third embodiment reads an image will be described. When the image reading device body 5 is not performing a reading operation, the light shielding device 50 is Then, the home position of the light shielding unit 60 is detected (step ST11). The light shielding device 50 positions the light shielding unit 60 at the home position by operating the motor 71 by the control unit 80 based on the detection of the home position by the position sensor 75.

Next, it is determined whether or not the open / close switch 90 is ON (step ST31). That is, the control unit 80 determines whether or not the opening / closing switch 90 is performing ON output when it is detected that the pressing plate 55 has been closed after being opened. If it is determined by this determination that the opening / closing switch 90 is not outputting ON (step ST31, No determination), this determination is repeated until the opening / closing switch 90 outputs ON and waits.

On the other hand, when it is determined that the opening / closing switch 90 is ON (step 31, Yes determination), that is, when the opening / closing switch 90 detects that the holding plate 55 is closed after being opened, it is turned ON. If it is determined that the output is performed, a scan trigger is issued (step ST32). This scan trigger is issued to the image reading apparatus body 5. The image reading apparatus body 5 starts the reading operation of the medium S by receiving this scan trigger.

On the other hand, the shading device 50 that has issued the scan trigger delays for a specified time (step ST13). That is, the image reading apparatus main body 5 that has received the scan trigger waits until the optical unit 20 is actuated to start reading, and when the specified time has elapsed, the control unit 80 rotates the motor 71 forward with the specified pulse ( Step ST14). As a result, the moving speed V (y) of the reading target line L is determined in a state where the light shielding unit 60 is positioned slightly forward in the sub-scanning direction with respect to the reading target line L moving in the sub-scanning direction. Move at the same moving speed V (y).

The operation for reading the medium S in the image reading device main body 5 is completed, and the image reading device main body 5 starts to rotate the optical unit 20 in the direction of moving the reading target line L from the front side to the rear side in the sub-scanning direction. Then, the control part 80 of the light-shielding apparatus 50 reversely rotates the motor 71 with a designated pulse (step ST15). Thereby, the light shielding unit 60 is moved to the home position, and the light shielding unit 60 is kept in the home position until the pressing plate 55 is opened and closed and the next reading is performed by the image reading apparatus body 5.

In the image reading apparatus 1 according to the third embodiment described above, when the opening / closing switch 90 detects that the presser plate 55 has been opened and closed, the image reading apparatus 1 issues a scan trigger to the image reading apparatus main body 5 to generate an image. The reading device main body 5 performs a reading operation. As a result, the image reading apparatus body 5 can read the medium S at the timing when the pressing plate 55 of the light shielding device 50 is opened and closed to replace the medium S placed on the placement surface 2. Thereby, when reading the image of the medium S, it is not necessary to perform an input operation on the scan switch 45, and the image of the replaced medium S can be replaced by merely opening and closing the press plate 55 and replacing the medium S. It can be read by the main body 5. As a result, it is possible to simplify the work procedure at the time of reading work, and it is possible to improve convenience when reading an image in which deterioration in quality is suppressed.

[Modification]
In the image reading apparatus 1 according to the first to third embodiments, the light shielding device 50 is provided with the pressing plate 55, but the light shielding device 50 may not be provided with the pressing plate 55. FIG. 17 is a perspective view of a modification example of the image reading apparatus 1 according to the first embodiment, in which a shielding portion frame is provided in the light shielding device. For example, as illustrated in FIG. 17, the light shielding device 50 included in the image reading apparatus 1 does not have a function of pressing the medium S, and includes only a function of moving the light shielding unit 60 in the sub-scanning direction. 95 may be provided. The shielding portion frame portion 95 has a configuration in which the transmission portion 56 is removed from the pressing plate 55 provided in the light shielding device 50 included in the image reading apparatus 1 according to the embodiment. That is, the shielding portion frame portion 95 is connected to the holding plate support portion 51 so as to be openable and closable, and the timing belt 72 and the carrier shaft 73 for moving the shielding portion 60 are attached to the shielding portion frame portion 95. It has been.

By providing the light shielding device 50 with a shielding portion frame portion 95 that does not include the transmission portion 56, the shielding portion frame portion is configured to open and close the pressing plate 55 when the medium S on the placement surface 2 is placed. The medium S can be placed on the placement surface 2 without opening and closing 95. That is, since the shielding portion frame portion 95 is not provided with the transmission portion 56, when the light shielding device 50 having the shielding portion frame portion 95 is placed on the placement surface 2, the placement surface 2 is It will be in the state exposed from the inner side of the frame part 95 for shielding parts formed in a rectangular shape. For this reason, when the medium S is placed on the placement surface 2, the medium S is placed on the placement surface 2 by placing it on the placement surface 2 exposed from the inside of the shielding portion frame portion 95. It can be easily mounted. Thereby, it is possible to simplify the work procedure at the time of reading work, and it is possible to improve convenience when reading an image in which deterioration in quality is suppressed.

In the image reading device 1 according to the first to third embodiments, only the light source 21 provided in the optical unit 20 of the image reading device body 5 is used as a light source for imaging the medium S placed on the placement surface 2. Although used, a light source other than the light source 21 of the optical unit 20 may be used as a light source for imaging the medium S. FIG. 18 is a side view of a modification of the image reading apparatus 1 according to the first embodiment in the case where a light source is provided in the light shielding portion. As a light source for capturing an image of the medium S, a light shielding unit light source 100 that irradiates light to the reading target line L may be provided in the light shielding unit 60 of the light shielding device 50. The light source 100 for the light shielding part is composed of a linear light source that extends in the main scanning direction, such as an LED light guide, an LED array, and a cold cathode tube, and is disposed on the rear surface of the light shielding part 60 in the sub scanning direction. Light can be irradiated on the rear side in the sub-scanning direction and in the direction of the placement surface 2.

Specifically, the light source 100 for the light-shielding part provided in the light-shielding part 60 located slightly in front of the reading target line L in the sub-scanning direction reads so that the reflected light reflected from the reading target line L does not enter the CCD 27. The target line L can be irradiated with light. For example, when irradiating light to the reading target line L from the light shielding unit 60 side, the reflected light reflected from the reading target line L becomes reflected light incident on the CCD 27 and the angle between the mounting surface 2 and the mounting surface 2. The light source 100 for the light shielding part is disposed at a position where the irradiation light can be emitted from a position where the angle with respect to the mounting surface 2 becomes small.

The light shielding device 50 provided with the light source 100 for the light shielding portion and the image reading device main body 5 provided in this way can transmit and receive signals by wireless communication or electrical connection. The partial light source 100 is turned on when the image capturing unit 22 captures an image. That is, when the image reading device main body 5 performs a reading operation, the image reading device main body 5 transmits a lighting instruction signal for the light source 100 for the light shielding unit to the light shielding device 50, and receives the light shielding instruction signal. The device 50 turns on the light source 100 for the light-shielding part using this lighting instruction signal as a trigger. Thereby, the light source 100 for light shielding part irradiates the reading target line L.

Further, when the image is read by the image reading apparatus main body 5, as the image capturing unit 22 picks up an image while rotating the optical unit 20 so as to move the reading target line L in the sub-scanning direction, The light shielding unit 60 is moved in the sub-scanning direction. For this reason, the light source 100 for the light shielding part provided in the light shielding part 60 also continues to irradiate the reading target line L.

Even if the irradiation light emitted from the light source 100 for the light-shielding part is regularly reflected by the medium S or the holding plate 55, it is not reflected in the direction of the imaging part 22, so that the imaging part 22 does not receive regular reflection light. The medium S irradiated with the irradiation light from the light source 100 for the light shielding unit and the irradiation light from the light source 21 of the optical unit 20 is imaged. Thereby, the imaging unit 22 can image the reading target line L irradiated with the irradiation light from the light source 21 included in the optical unit 20 and the irradiation light from the light source 100 for the light shielding unit. The medium S placed on 2 can be imaged more clearly.

Further, since the light source 100 for the light shielding unit irradiates the irradiation light from the direction opposite to the direction in which the light source 21 of the optical unit 20 irradiates the reading target line L in the sub scanning direction, the light source 21 of the optical unit 20 The image quality such as shading can be adjusted by the combination with the irradiation light. For example, by making the illuminance from the light source 21 of the optical unit 20 equal to the illuminance from the light source 100 for the light-shielding portion, shadows can be reduced even when the medium S has a three-dimensional shape such as an embossed card. As a result, it is possible to suppress a decrease in image quality due to regular reflection of the external light E and obtain a higher quality image.

Further, since the light shielding unit light source 100 is disposed in the vicinity of the reading target line L, when the light shielding unit light source 100 irradiates the reading target line L, the reading target even if it is irradiated with a small amount of light. The illuminance at the line L can be increased. For this reason, for example, by making the light quantity of the light source 100 for the light-shielding part relatively small, the total light quantity of the light source 21 of the optical unit 20 and the light source 100 for the light-shielding part can be suppressed, and the electric consumption can be reduced. it can.

When the light shielding unit light source 100 is provided in the light shielding unit 60, the light source unit 20 of the image reading apparatus body 5 is not provided with the light source 21, and the light source that irradiates the reading target line L is the light source for the light shielding unit. 100 may be sufficient. Since the light source 100 for the light shielding unit is close to the reading target line L, the illuminance necessary for imaging by the imaging unit 22 can be obtained with a small amount of light. Thereby, electricity consumption can be reduced more reliably.

In the image reading device 1 according to the first to third embodiments, the image reading device main body 5 and the light shielding device 50 are configured to be detachable, but the image reading device main body 5 and the light shielding device 50 are configured integrally. It may be. By integrally configuring the image reading device main body 5 and the light shielding device 50, the position of the reading target line L and the position of the light shielding portion 60 of the light shielding device 50 when the imaging unit 22 of the image reading device main body 5 captures an image. The relationship can be made more appropriate. As a result, it is possible to more reliably suppress deterioration in image quality due to regular reflection of the external light E.

In the image reading apparatus 1 according to the second and third embodiments, the image reading apparatus body 5 and the light shielding device 50 can perform the reading operation by performing direct communication between the image reading apparatus body 5 and the light shielding apparatus 50. However, the image reading apparatus main body 5 and the light shielding device 50 do not have to communicate directly with each other. For example, both the image reading device main body 5 and the light shielding device 50 are provided so as to be able to communicate with the external device 40, and communication is performed between the image reading device main body 5 and the light shielding device 50 via the external device 40. By doing so, the image reading device main body 5 and the light shielding device 50 may be interlocked.

In the image reading apparatus 1 according to the first to third embodiments, during the reading operation of the image reading apparatus main body 5, the light shielding device 50 moves the light shielding unit 60 at a predetermined moving speed. The movement control of the light shielding unit 60 may be performed while detecting the speed of the reading operation of the image reading apparatus main body 5. For example, a sensor that detects a reading target line L that is brightened by the irradiation light from the light source 21 of the image reading apparatus body 5 is provided in the light shielding unit 60, and reading is performed while detecting the position of the reading target line L with this sensor. The movement control of the light shielding unit 60 may be performed in accordance with the movement speed of the target line L. Thereby, the movement control of the light shielding unit 60 can be performed while the positional relationship of the light shielding unit 60 with respect to the reading target line L is set to a more desirable positional relationship. As a result, it is possible to more reliably suppress deterioration in image quality due to regular reflection of the external light E.

DESCRIPTION OF SYMBOLS 1 Image reader 2 Mounting surface 5 Image reader main body 10 Case 20 Optical unit 21 Light source 22 Imaging part 27 CCD (imaging element)
30, 80 Control unit 31 Drive device (first actuator)
DESCRIPTION OF SYMBOLS 50 Light-shielding device 51 Pressure plate support part 53 Illuminance sensor 55 Pressure plate 56 Transmission part 60 Light-shielding part 70 Drive mechanism 71 Motor (2nd actuator)
72 Timing belt 73 Carrier shaft 75 Position sensor 90 Open / close switch 100 Light source for light-shielding part E External light L Read target line (imaging position)
R Reflected light S Medium

Claims

An imaging unit having an imaging device that images a part of the placement surface on which the medium is placed and reads the image;
A first actuator for moving the imaging position of the imaging device in one direction;
A light-shielding portion that is disposed above the placement surface and shields light;
A second actuator for moving the light shielding portion in the one direction;
A control unit that drives and controls at least the second actuator;
With
The control unit performs movement control of the light shielding unit by the second actuator in conjunction with movement of the imaging position by the first actuator during imaging by the imaging unit.
The movement control of the light-shielding part is performed by the light-shielding part at a light-shielding position that shields external light that is reflected light that is reflected at the image-capturing position before entering the image-capturing element before reaching the image-capturing position. An image reading apparatus characterized by moving.
The image reading apparatus according to claim 1,
Between the mounting surface and the light-shielding portion, the medium placed on the mounting surface is pressed against the mounting surface side, and further includes a pressing plate having transparency,
The light-shielding portion moves in the one direction on the pressing plate;
Image reading device.
The image reading apparatus according to claim 2,
A pressing plate supporting portion that supports the pressing plate so as to be openable and closable with respect to the mounting surface;
Image reading device.
The image reading apparatus according to any one of claims 1 to 3,
A light source for a light shielding part that is provided in the light shielding part and irradiates light to the imaging position;
The light source for the light shielding unit irradiates the imaging position with light so that reflected light reflected at the imaging position does not enter the imaging element,
The light source for the light-shielding part is turned on when imaging by the imaging unit.
Image reading device.
The image reading apparatus according to any one of claims 1 to 4,
The imaging unit and the first actuator are provided in a housing placed on the placement surface,
The housing is detachable with respect to the light shielding portion and the second actuator.
Image reading device.
An imaging unit having an imaging device that images a part of the placement surface on which the medium is placed and reads the image;
A first actuator for moving the imaging position of the imaging device in one direction;
A light-shielding portion that is disposed above the placement surface and shields light;
A light source for a light-shielding part that is provided in the light-shielding part and that irradiates light to the imaging position during imaging by the imaging unit;
A second actuator for moving the light shielding part and the light source for the light shielding part in the one direction;
A control unit that drives and controls at least the second actuator;
With
The light source for the light shielding unit irradiates the imaging position with light so that reflected light reflected at the imaging position does not enter the imaging element,
The light source that irradiates the imaging position with light is only the light source for the light shielding part,
The control unit performs movement control of the light shielding unit by the second actuator in conjunction with movement of the imaging position by the first actuator during imaging by the imaging unit.
The movement control of the light-shielding part is performed by the light-shielding part at a light-shielding position that shields external light that is reflected light that is reflected at the image-capturing position before entering the image-capturing element before reaching the image-capturing position. Move
An image reading apparatus.