JP6750939B2 - Image reader - Google Patents

Description

The present invention relates to an image reading device that reads a document while conveying the document.

Conventionally, there has been an image reading apparatus in which images on both front and back sides of a document are read by two image reading units, and both white and black background members are mounted. If the original is thin and you want to suppress show-through, place a black side on the back side of the original, and if you want to prevent the original from being irregularly sized and read black around the original, place a white side on the back side of the original.

A movable mechanism is required to switch the background color. In the image reading device described in Patent Document 1, a method is proposed in which either the front or back reading unit is moved along the transport direction by a movable mechanism to change the position of the image reading unit and switch the background color. When the reading unit moves, a white background plate or a black background plate is arranged so as to face the reading positions of the image reading units on both front and back sides.

JP, 2001-16412, A

However, when the technique described in Patent Document 1 is applied to the background switching of an image reading apparatus having two image reading units, the housing itself including the optical system is moved to read the white background plate and the black background plate, respectively. It is necessary to secure a space for this, and the size of the entire device becomes large.

According to the invention, for example,
An apparatus main body having a feeding unit that feeds a sheet,
A first reading sensor which is provided in the first reading unit and which reads one side of the sheet moving along the conveyance path;
A second reading sensor which is provided in a second reading unit which is provided so as to face the first reading sensor with the conveyance path interposed therebetween, and which reads an image on the other surface of the sheet;
A first background portion provided at a position readable by the first reading sensor and serving as a reading background of the first reading sensor;
A second background portion provided at a position readable by the second reading sensor and serving as a reading background of the second reading sensor;
A moving unit that integrally moves the first reading sensor and the second background unit along the transport path;
The first background portion has a third background portion on the side opposite to the second reading sensor in the moving direction of the sheet,
The second background portion has a fourth background portion on the side opposite to the first reading sensor in the moving direction,
The fourth background portion has an inclined surface that is inclined with respect to the conveyance path, and is configured such that the light emitted to the sheet does not directly enter the second reading sensor .

According to the present invention, it is possible to provide a technique for downsizing the apparatus by enabling the background switching with the structure in which the reading unit is fixed to the main body of the image reading apparatus.

1 is a schematic diagram of an image reading apparatus according to an embodiment of the present invention. 2 is a block diagram of a control unit of the image reading apparatus in FIG. 1. FIG. 1 is a front view of an image reading apparatus according to an embodiment of the present invention. FIG. 6 is another front view of the image reading apparatus according to the embodiment of the present invention. FIG. 3 is a top view of the image reading apparatus according to the embodiment of the present invention. FIG. 6 is another top view of the image reading apparatus according to the embodiment of the present invention. 1 is a schematic sectional view of an image reading device according to an embodiment of the present invention. FIG. 3 is another schematic cross-sectional view of the image reading device according to the embodiment of the present invention. 1 is a side view of an image reading device according to an embodiment of the present invention. 1 is a side view of an image reading device according to an embodiment of the present invention. 1 is a schematic sectional view of an image reading device according to an embodiment of the present invention. 1 is a schematic sectional view of an image reading device according to an embodiment of the present invention. The perspective view of CIS. (A), (b) is sectional drawing of the reading unit 70. FIG.

FIG. 1 is a schematic diagram of an image reading apparatus A according to an embodiment of the present invention.

<Device configuration>
The image reading apparatus A is an apparatus that conveys one or a plurality of conveyance media S loaded on the mounting table 1 one by one into the apparatus via a route RT, reads the image, and discharges the image onto a discharge tray 2. The transport medium S to be read is, for example, a sheet of OA paper, check, check, business card, card, etc., and may be a thick sheet or a thin sheet. Examples of cards include insurance cards, licenses, credit cards, and the like. The transport medium S also includes a booklet such as a passport. When targeting a booklet, a holder can be used. By accommodating the booklet in the spread state in the holder and mounting it on the mounting table 1, the booklet is conveyed together with the holder, and the image can be read.

<Paper feeding>
A first transport unit 10 is provided as a feeding mechanism that feeds the transport medium S along the route RT. In the case of the present embodiment, the first transport unit 10 includes a feed roller 11 and a separation roller 12 arranged to face the feed roller 11, and sequentially transports the transport medium S on the mounting table 1 one by one in the transport direction D1. .. A driving force is transmitted from the drive unit 3 such as a motor to the feed roller 11 via the transmission unit 5, and is rotationally driven in the direction of the arrow in the drawing (the forward direction in which the transport medium S is transported along the route RT). The transmission unit 5 is, for example, an electromagnetic clutch, and disconnects the driving force from the driving unit 3 to the feed roller 11.

<Drive unit>
For example, in the present embodiment, the transmission unit 5 that connects the drive unit 3 and the feed roller 11 is in a state in which the driving force is normally transmitted, and shuts off the driving force when the transport medium S is fed backward. When the transmission of the driving force is interrupted by the transmission unit 5, the feed roller 11 is in a freely rotatable state. Note that such a transmission unit 5 may not be provided when the feed roller 11 is driven in only one direction.

<Separation structure>
The separation roller 12 arranged to face the feed roller 11 is a roller for separating the transport medium S one by one, and is in pressure contact with the feed roller 11 at a constant pressure. In order to ensure this pressure contact state, the separation roller 12 is provided so as to be swingable and is biased to the feed roller 11. The driving force is transmitted from the drive unit 3 to the separation roller 12 via the torque limiter 12a, and the separation roller 12 is rotationally driven in the direction indicated by the solid line arrow (the direction opposite to the forward direction of the feed roller 11).

Since the driving force transmission of the separation roller 12 is restricted by the torque limiter 12a, when the separation roller 12 is in contact with the feed roller 11, the separation roller 12 rotates in a direction that rotates with the feed roller 11 (a direction indicated by a broken arrow). As a result, when a plurality of transport media S are transported to the pressure contact portion between the feed roller 11 and the separation roller 12, two or more transport media S, except for one, are restrained from being transported downstream. ..

In the present embodiment, the separation mechanism is composed of the separation roller 12 and the feed roller 11, but such a separation mechanism does not necessarily have to be provided, and the feeding medium for sequentially feeding the transport medium S one by one to the route RT. Any sending mechanism may be used. Further, in the case of providing the separating mechanism, instead of the structure such as the separating roller 12, a separating pad for giving a frictional force to the transport medium S is brought into pressure contact with the feed roller 11 so that the same separating work is performed. May be.

<Transfer structure>
The second transport unit 20 as a transport mechanism on the downstream side in the transport direction of the first transport unit 10 includes a drive roller 21 and a driven roller 22 that is driven by the drive roller 21, and is transported from the first transport unit 10. The transport medium S is transported to the downstream side. A driving force is transmitted from the driving unit 4 such as a motor to the driving roller 21, and is rotationally driven in the direction of the arrow in the figure. The driven roller 22 is pressed against the drive roller 21 at a constant pressure and is rotated by the drive roller 21. The driven roller 22 may be biased against the drive roller 21 by a biasing unit (not shown) such as a spring.

The third transport unit 30 located downstream of the second transport unit 20 in the transport direction includes a drive roller 31 and a driven roller 32 that is driven by the drive roller 31, and is transported from the second transport unit 20. The transported medium S is transported to the discharge tray 2. That is, the third transport unit 30 functions as a discharge mechanism. A driving force is transmitted from the driving unit 4 such as a motor to the driving roller 31, and is rotationally driven in the direction of the arrow in the figure. The driven roller 32 is pressed against the drive roller 31 at a constant pressure and is entrained by the drive roller 31. The driven roller 32 may be biased against the drive roller 31 by a biasing unit (not shown) such as a spring.

The discharge tray 2 is pivotally supported via a first hinge 101 provided below the image reading apparatus A so as to be rotatable with respect to the image reading apparatus A. Further, it is composed of a first discharge tray 2a on the side of the first hinge 101 and a second discharge tray 2b connected to the tip side thereof, and the second discharge tray 2b is rotatable with respect to the first discharge tray 2a. Is supported by.

<Image reading structure and control>
Here, in the image reading apparatus A of the present embodiment, since the image is read by the image reading units 70 and 71 arranged between the second transport unit 20 and the third transport unit 30, the second transport unit 20 is read. The third transport unit 30 transports the transport medium S at a constant speed. By always setting the transport speed to be equal to or higher than the transport speed of the first transport unit 10, it is possible to reliably avoid the situation in which the subsequent transport medium S catches up with the preceding transport medium S. For example, in the present embodiment, speed control is performed such that the transport speed of the transport medium S by the second transport unit 20 and the third transport unit 30 is faster than the transport speed of the transport medium S by the first transport unit 10. did.

Even when the transport speed of the transport medium S by the second transport unit 20 and the third transport unit 30 and the transport speed of the transport medium S by the first transport unit 10 are the same, the drive unit 3 is controlled. It is also possible to form the minimum interval between the preceding transport medium S and the subsequent transport medium S by intermittently shifting the feeding start timing of the subsequent transport medium S.

<Double feed detection>
In the double feed detection sensor 40 arranged between the first transport unit 10 and the second transport unit 20, when the transport media S such as papers are brought into close contact with each other due to static electricity or the like and have passed through the first transport unit 10 ( That is, this is an example of a detection sensor (a sensor that detects the behavior and state of the sheets) for detecting this in the case of a double feed state where the sheets are conveyed in an overlapping manner. As the double feed detection sensor 40, various ones can be used, but in the case of the present embodiment, it is an ultrasonic sensor, and is provided with an ultrasonic wave transmission section 41 and its reception section 42, and a conveyance medium such as paper. The double feed is detected on the principle that the attenuation amount of the ultrasonic waves passing through the transport medium S is different between the case where the S is double-fed and the case where the S is transported one by one.

<Registration sensor>
The medium detection sensor 50 arranged on the downstream side of the double feed detection sensor 40 in the conveyance direction is located on the upstream side of the second conveyance section 20 and on the upstream side of the first conveyance section 10. This is an example of a detection sensor (a sensor that detects the behavior or state of the sheet), and is the position of the transport medium S transported by the first transport unit 10, more specifically, the transport medium S at the detection position of the medium detection sensor 50. Detects whether the edge has reached or passed. As the medium detection sensor 50, various types can be used, but in the case of the present embodiment, the medium detection sensor 50 is an optical sensor, and is provided with a light emitting unit 51 and a light receiving unit 52 thereof. The carrier medium S is detected on the principle that the intensity (the amount of received light) changes.

In the case of the present embodiment, when the leading edge of the transport medium S is detected by the medium detection sensor 50, the transport medium S reaches the position where the double feed detection sensor 40 can detect the double feed. The detection sensor 50 is provided near the double feed detection sensor 40 and on the downstream side thereof. The medium detection sensor 50 is not limited to the above-mentioned optical sensor, and for example, a sensor (image sensor or the like) that can detect the end portion of the transport medium S may be used, or a lever type that projects to the route RT. It may be a sensor.

A medium detection sensor 60 different from the medium detection sensor 50 is arranged upstream of the image reading units 70 and 71. This is an example of a downstream detection sensor arranged on the downstream side of the second transport unit 20, and detects the position of the transport medium S transported by the second transport unit 20. Although various types of medium detection sensors 60 can be used, in the case of the present embodiment, the medium detection sensor 60 is an optical sensor like the medium detection sensor 50, and includes a light emitting unit 61 and a light receiving unit 62, and the medium S The carrier medium S is detected on the principle that the received light intensity (amount of received light) changes due to arrival or passage. In the present embodiment, the medium detection sensors 50 and 60 are arranged on the upstream side and the downstream side of the second transport unit 20 in the transport direction, but only one of them may be disposed.

<CIS placement>
The image reading units 70 and 71 on the downstream side of the medium detection sensor 60, for example, optically scan, convert into electric signals and read as image data, and internally include a light source such as an LED, an image sensor, and the like. It is equipped with a lens array.

<Explanation of block diagram>
The control unit 80 will be described with reference to FIG. FIG. 2 is a block diagram of the control unit 8 of the image reading apparatus A.

The control unit 80 includes a CPU 81, a storage unit 82, an operation unit 83, a communication unit 84, and an interface unit 85. The CPU 81 executes the program stored in the storage unit 82 to control the entire image reading apparatus A. The storage unit 82 is composed of, for example, a RAM and a ROM. The operation unit 83 includes, for example, a switch and a touch panel, and receives an operation from the operator.

The communication unit 84 is an interface that performs information communication with an external device. When a PC (personal computer) is assumed as the external device, the communication unit 84 can be, for example, a USB interface or a SCSI interface. In addition to such a wired communication interface, the communication unit 84 may be a wireless communication interface, and may have both wired communication and wireless communication interfaces.

The interface unit 85 is an I/O interface that inputs and outputs data to and from the actuator 86 and the sensor 87. The actuator 86 includes the drive unit 3, the drive unit 4, the transmission unit 5, and the like. The sensor 87 includes the double feed detection sensor 40, the medium detection sensors 50 and 60, the image reading units 70 and 71, and the like.
<Drive by receiving start instruction from PC>
The basic operation of the image reading apparatus A will be described. For example, when the control unit 80 receives an image reading start instruction from an external personal computer to which the image reading apparatus A is connected, the control unit 80 starts driving the first transport unit 10 to the third transport unit 30. The transport media S loaded on the mounting table 1 are transported one by one from the transport media S located at the lowest position. Alternatively, the reading operation is started by receiving the start time provided in the image reading apparatus A.

<Control during double feeding>
In the middle of the conveyance, the conveyance medium S determines whether or not there is a multifeed, and the conveyance is continued if it is determined that there is no multifeed. When it is determined that there is a double feed, the conveyance is stopped, or the succeeding transport medium S is not taken in by the first transport unit 10 and the transport medium S in the double feed state is discharged as it is. You can
<Starting reading according to the output of the registration sensor>
The control unit 80 starts the image reading by the image reading units 70 and 71 of the carrying medium S carried by the second carrying unit 20 at the timing based on the detection result of the medium detection sensor 60, and reads the read image. Primary memory is stored and sequentially sent to an external computer. The transport medium S from which the image is read is discharged to the discharge tray 2 by the third transport unit 30, and the image reading process of the transport medium S is completed.

<Paper discharge structure>
FIG. 3 is a front view of the image reading apparatus A according to the embodiment of the present invention in a state where the discharge tray 2 is unfolded.

A display screen 93 is provided on the display panel 90 on the upper front, and operation keys 122 are provided at adjacent positions.

The lower panel 91 on the lower front side is provided with a discharge opening 92, and the transport medium S transported by the third transport unit 30 is discharged.

FIG. 4 is a front view of the image reading apparatus A according to the embodiment of the present invention in a state in which the discharge tray 2 is stored.

The discharge tray 2 is rotatably supported by the first hinge 101 provided below the image reading apparatus A so as to be rotatable with respect to the image reading apparatus A. The discharge tray 2b is configured to cover the front surface of the main body.

The first discharge tray 2a is attached to the main body 100 of the image reading apparatus A so as to be rotatable around the first hinge 101 as a fulcrum. The first discharge tray 2a is formed with the same size as the combined area of the lower panel 91 and the discharge opening 92, and is rotated about the first hinge 101 as a fulcrum when the discharge tray 2 is stored as shown in FIG. It is folded so as to cover the lower panel 91 and the discharge opening 92.

The second discharge tray 2b is formed to have the same size as the display panel 90, and when the discharge tray 2 is stored as shown in FIG. 4, the second discharge tray 2b is rotated about the second hinge 102 provided at the tip of the first discharge tray 2a. It moves and is folded so as to overlap the display panel 90.

FIG. 5 is a top view of the image reading apparatus A according to the embodiment of the present invention in a state where the discharge tray 2 is unfolded.

The transport medium S transported by the third transport unit 30 is discharged to the first discharge tray 2a through the discharge opening 92, and reaches the second discharge tray 2b depending on the size of the transport medium S and is guided.

A discharge position adjusting member 120 is rotatably provided on the first discharge tray 2a, and when a transport medium S having a smaller size than the first discharge tray 2a such as a business card is discharged, By rotating the carrier medium S to the upright position, the position where the carrier medium S stops can be adjusted, and the discharged carrier medium S can be made less likely to be scattered.

Further, the second discharge tray 2b is provided with a light transmitting portion 121, and is arranged at a position overlapping the operation key 122 provided on the display panel. The operation key 122 is a power button for turning on/off the power of the main body, and is configured to light up when the power is on. The light-transmitting portion 121 arranged at a position overlapping the operation key 122 can confirm whether the operation key 122 is in a lighting state or a non-lighting state even when the discharge tray 2 is housed. You can check the power status of.

<Display panel configuration>
A display screen 93 is arranged on the display panel 90 provided at a position overlapping the second discharge tray 2b when the second discharge tray 2b is stored.

The display screen 93 is arranged so that the feeding tray 110, the width W of the conveyance path, and the center line X are at the same position. The image reading apparatus A according to the embodiment of the present invention is configured to be able to feed an A4 letter size as the maximum conveyance path width Wmax, and the width is Wmax=216 mm. The width of the display screen 93 is 224 mm, which is a length exceeding Wmax.

Thereby, for example, the read image can be displayed on the display screen 93 in an actual size, and the finished state can be easily confirmed, so that the convenience for the user can be improved.

<Details of feeding structure>
FIG. 6 is a top view of the image reading apparatus A according to the embodiment of the present invention in a state in which the discharge tray 2 is stored.

The loading platform 1 is provided with a regulation member 111 that is slidably attached in a direction orthogonal to the transport direction according to the size of the transport medium S to be placed.

<Details of upper unit>
FIG. 7 is a schematic sectional view of the image reading apparatus A according to the embodiment of the present invention.

The main body 100 is composed of an upper unit 103 and a lower unit 104, and the upper unit 103 is rotatably attached to the lower unit 104 with a main body hinge 105 as a fulcrum.

The upper unit 103 includes a display screen 90 having a width exceeding the maximum conveyance path width Wmax on the display panel 90, and a supporting frame sheet metal of the display screen 93. Therefore, as shown in FIG. Is largely displaced to the front side in the transport direction as compared with the state in which the upper unit 103 is housed as shown in FIG.

Therefore, if there is momentum when the upper unit is unfolded, the image reading apparatus A may tip over, but in the image reading apparatus A according to the present embodiment, the upper unit 103 has the protrusion 130. It is possible to prevent the image reading device A from tipping over even if the center of gravity moves due to the expansion of the image. The protrusion amount of the protrusion 130 is such that the protrusion amount can be set below the discharge tray 2 when the upper unit 103 and the discharge tray 2 are stored as shown in FIG. In the unfolded state, the amount of protrusion is such that it is located further forward than the center of gravity of the upper unit 103 in the transport direction. As a result, it is possible to prevent the image reading apparatus A from falling over due to the unfolding of the upper unit 103, and to prevent the image reading apparatus A from unnecessarily protruding in the housed state in which the discharge tray 2 is housed so as not to disturb the user.

<Adjusting the discharge tray angle>
Further, on the upper surface of the projecting portion 130, a tray support portion 131 is rotatably provided so as to come into contact with the lower surface of the ejection tray 2 when the ejection tray 2 is unfolded.

As shown in FIG. 9, the discharge tray 2 is supported by the protrusions 130 and can receive the discharge medium S to be discharged in the expanded state. As shown in FIG. 10, when the tray supporting portion 131 is rotated so as to project upward from the upper surface of the projecting portion 130, it comes into contact with the lower surface side of the discharging tray 2 to support the discharging tray 2, and thus the projecting portion 130. The angle of the discharge tray 2 can be adjusted from the state of FIG.

For example, in the state of FIG. 10, the discharge tray 2 is lifted upward in the vertical direction as compared with the state of FIG. 9, and the position where the leading end of the transport medium S lands on the upper surface of the discharge tray 2 can be changed. .. As a result, in the state of FIG. 9, in the case where the leading end of the discharged transport medium S abuts against the rear end of the already discharged transport medium S and pushes it out, as shown in FIG. By changing the angle, in addition to the action of moving the rear end of the already discharged transport medium S to the lower unit 104 side, the tip of the succeeding transport medium S is surely placed on the upper surface of the already discharged transport medium S. Can be landed. With such a configuration, the alignment of the discharged transport medium S on the discharge tray 2 can be significantly improved.

The tray support portion 131 may be configured to support the discharge tray 2 even in the middle of the rotation range, and the angle of the discharge tray 2 may be adjustable in a plurality of steps. In that case, each transport medium S can receive the transport medium S at an angle having the highest alignment on the discharge tray 2, and the usability can be improved.

<Reading sensor configuration>
The image reading units 70 and 71 are covered with sensor cases 70a and 71a made of a mold member, and have a structure in which glass is provided on the document transport surface side. The image reading unit 71 is movable in the direction perpendicular to the carrying direction, and the image reading unit 70 is fixed to the lower unit 104.

Here, the configuration inside the sensor cases 70a and 71a of the image reading units 70 and 71 will be described with reference to FIG.

CISs 72 and 73 as reading sensors and white reference plates 74 and 75 are provided in the sensor cases 70a and 71a. The photoelectric conversion element installed on the line and the light emitting elements 150 and 151 for irradiating the carrier medium S are provided. The CIS 72 in the image reading unit 70 reads the surface of the transport medium S. The CIS 73 in the image reading unit 71 reads the back surface of the transport medium S.

The CIS 72 and the CIS 73 are the same member and are arranged point-symmetrically with respect to the transport surface. Since the same member is used, there is an effect on cost reduction, and the structure can be simplified because the front surface and the back surface can be made common.

The white reference plates 74 and 75 are attached to the CIS 72 and 73. The light that illuminates the original through the light guide is reflected by the white reference plates 74 and 75 and enters the lenses 152 and 153, so that the background color is white. The black background portions 76 and 77 are a part of the housing in which the CIS 72 and 73 and the white reference plates 74 and 75 are arranged. When the CIS moves, there is no surface to reflect the light that illuminates the document through the light guide. In addition, even if the light reaches the black background portion, the inclined surface is angled so that the reflected light does not directly enter the facing lens. As a result, the background color becomes black. The inner walls of the sensor cases 70a and 71a of the image reading units 70 and 71 are made of a material for absorbing the light reflected by the black background portions 76 and 77. Alternatively, a member that absorbs light and does not reflect light may be arranged, but it is provided so as to include a position facing the black background portions 76 and 77 in the direction parallel to the conveyance path, and The inclination is also made to form an angle of 45 degrees or more with respect to the conveyance path so that the incident light is not reflected by the inner walls of the sensor cases 70a and 71a and guided to the opposing lens. Is preferred.

Although the white reference plate and the black background portion are separated in FIG. 11, the black background portion may be adjacent to the white reference plate.

As shown in FIG. 11, the white reference plate 74 is attached so that a part of it projects from the CIS 72 toward the light emitting/receiving element side. This is because the white reference plate 74 blocks the light traveling from the light emitting element 151 to the light receiving element 154 of the counter sensor. That is, it functions not only as a white reference plate but also as a light blocking plate. The white reference plate 75 of the opposite sensor is also configured in the same manner and has the same effect.

In order to enhance the effect of blocking the light traveling from the light emitting element 151 to the light receiving element 154 of the CIS 72 which faces the light emitting element 151, it is preferable that the light emitting element 151 is adjacent to the white reference plate 74 when viewed from the transport path side. In other words, it is preferable that the light emitting element 151 and the white reference plate 75 are arranged so that the projections on the conveyance path are adjacent to each other.

When the white reference plate 75 and the light emitting element 151 are close to each other, the white reference plate 75 is provided in the direction toward the lens 152 and the light receiving element 154 of the CIS 72 that face each other, so that the light blocking effect is improved. Therefore, it is preferable that the white reference plate 75, the light emitting element 151, and the light receiving element 155 be arranged in this order along the transport path. The same applies to the white reference plate 75 of the opposite sensor.

<Background switching configuration>
Next, the background color switching configuration will be described. FIG. 11 is a top view of the image reading unit according to the present embodiment.

FIG. 12 is a sectional view taken along the section Y of FIG. FIG. 12A corresponds to the position in the white background color, and FIG. 12B corresponds to the position in the black background color.

The CIS 72 of the image reading unit 70 is attached to the CIS 72 and the CIS by transmitting the driving force of the CIS sliding motor 79 arranged in the lower unit 104 via the transmission member 78 provided in the image reading unit 70. The white reference plate 74 is movable in parallel with the carrying direction.

When the background color of the read image is white, the white background can be read by arranging the reading position of the CIS 72 at the position of the white reference plate 75 which faces the reading position. At this time, since the CIS 72 and the white reference plate 74 move integrally, when the CIS 72 is placed at the white background position, the white reference plate 74 is placed at a position facing the reading position of the CIS 73, and the white background can be read. Become.

When the background color of the read image is set to black, the black background can be read by arranging the reading position of the CIS 72 at the position of the black background portion 77 facing the CIS 72.

The light emission of the light emitting element 150 in CIS72 is diffused at the slope of the black background portion 77, to achieve a reading of the black background by not incident to the light receiving element 154.

When the CIS on one side moves, the opposing sensor also moves relatively, and the background can be switched over in a short distance. Further, the background color of the first reading sensor 70 and the second reading sensor 71 can be switched at the same time by moving the CIS on one side.

Based on the reading position of the white background, when the black background is read, it is necessary to adjust the tip margin according to the movement of the CIS. Since the amount of CIS movement is fixed, when the CIS 72 moves to the black background reading position, the reading start timing is changed according to the amount of movement of the CIS 72, and the leading edge margin is adjusted.

Here, as a conventional technique, there is a black reference plate, and black background reading is realized by arranging the CIS reading position at the position of the black reference plate. However, if dust or paper dust adheres to the black reference plate, it becomes dirty and the reference value cannot be maintained. Therefore, correction control is required. In this patent, since the background color image is not affected even if the black background portion becomes dirty, the black reference can be maintained, and stable black reference can be acquired without performing correction or the like.

The arrangement in the CIS 72 is a black reference portion 76, a color reference plate 74, and a light emitting/receiving portion 154 from the left of the drawing. By arranging this arrangement, the movement distance of the CIS can be minimized.

Since the black background portion 77 needs to cover the entire surface in the device width direction, it is preferable that the transmission member connecting portion 140 be on the side opposite to the black background portion.

Next, a configuration in which the CIS 72 moves in the transport direction within the image reading unit 70 will be described with reference to FIGS. 13 and 14. FIG. 13 is a perspective view of the CIS, and FIGS. 14A and 14B are cross-sectional views of the reading unit 70, which are cross-sectional views in cross-section A and cross-section B in FIG. 11, respectively.

Bosses 141 are provided at both ends of the CIS 72, and are sandwiched by the inner wall member of the image reading unit 70 and the guide member 142. When switching the background by driving the CIS sliding motor 79, the CIS 72 moves along this guide in parallel with the transport direction. The CIS has a characteristic of having a short focal length, and in order to improve the positional accuracy in the transport direction, which is the reading direction, and the vertical direction, the parallel movement along the guide as described above is preferable. The material of the boss 141 is preferably a material having good slidability different from the sensor case 70a of the image reading unit 70 and the like.

In the present embodiment, the image reading units 70 and 71 are arranged in a sensor case so as to surround the CISs 72 and 73 as reading sensors, but this is not always necessary, and the reading sensor and the reference plate, the black reference portion, or other parts may be used. It suffices if the color reference portion has a movable unit.

In the description of the above embodiment, it is preferable to configure the CIS 73 to be the same in the description of only the CIS 72.

A image reading apparatus S transport medium 1 mounting table 2 discharge tray 2a first discharge tray 2b second discharge tray 3, 4 drive unit 5 transmission unit 10 first transport unit 11 feed roller 12 separation roller 20 second transport unit 21 drive roller 22 Driven Roller 30 Third Transport Portion 31 Drive Roller 32 Driven Roller 40 Driven Roller 40 Double Feed Detection Sensor 50, 60 Medium Detection Sensor 70, 71 Image Reading Unit 70a, 71a Case 72, 73 Contact Image Sensor (CIS)
74, 75 Color reference plates 76, 77 Black background color part 78 Transmission member 79 CIS sliding motor 80 Control part 84 Communication part 90 Display panel 91 Lower panel 93 Display screen 100 Main body 101 First hinge 102 Second hinge 103 Upper unit 104 Lower unit 105 Main body hinge 111 Restricting member 120 Ejection position adjusting member 121 Light transmitting part 122 Operation key 130 Projecting part 131 Tray supporting part 140 Transmission member connecting part 141 Boss 142 Guide member 150, 151 Light emitting element 152, 153 Lens 154, 155 Light receiving element

Claims (7)

An apparatus main body having a feeding unit that feeds a sheet,
A first reading sensor which is provided in the first reading unit and which reads one side of the sheet moving along the conveyance path;
A second reading sensor which is provided in a second reading unit which is provided so as to face the first reading sensor with the conveyance path interposed therebetween, and which reads an image on the other surface of the sheet;
A first background portion provided at a position readable by the first reading sensor and serving as a reading background of the first reading sensor;
A second background portion provided at a position readable by the second reading sensor and serving as a reading background of the second reading sensor;
A moving unit that integrally moves the first reading sensor and the second background unit along the transport path;
The first background portion has a third background portion on the side opposite to the second reading sensor in the moving direction of the sheet,
The second background portion has a fourth background portion on the side opposite to the first reading sensor in the moving direction,
The fourth background portion has an inclined surface that is inclined with respect to the conveyance path, and is configured so that the light emitted to the sheet does not directly enter the second reading sensor. Reader. By moving the first reading sensor and the second background portion integrally along the transport path by the moving unit,
The first reading sensor moves out of a position where the first background portion can be read, and at the same time, the second reading sensor moves out of a position where the second background portion can be read. The image reading device described. The second reading sensor, the first background portion, the third background portion, and
The image reading apparatus according to claim 1 , wherein the first reading sensor, the second background portion, and the fourth background portion are arranged adjacent to each other in that order in the movement direction . The background color of the first background portion and the second background portion is white,
The image reading apparatus according to claim 3, wherein the third background portion and the fourth background portion are black. The image reading apparatus according to claim 4, wherein the fourth background portion is a wall surface of a fixing member to which the second background portion is attached. Said first reading unit, a wall surface facing the conveying path in parallel with the fourth background portion image reading apparatus according to claim 1, characterized in that a dark surface. The first reading unit and the second reading unit, according to any one of claims 1 to 6, characterized in that said a conveying path of the same structure arranged point symmetrical with respect to the Image reading device.

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