JP2004007239A - Double-sided image reader - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a double-sided image reader which reads images on the double-sides of a sheet-shaped original 31 passing on an original platen glass 16 one time by making a CCD reading unit 11 and a CIS 21 face to the front and back faces of the original respectively and in which the stable transport of the original 31 is maintained while the influence of illumination on reading is removed. <P>SOLUTION: An original platen glass 16 is notched so as to be split into a first guide supporting part 16a facing to a CCD reading unit 11 and arranged at the relatively upstream side and a second guide supporting part 16b facing to a CIS 21 and arranged at the downstream side in a transport direction 32. Thus, the two guide supporting parts 16a and 16b are provided with mutually equal friction coefficients μ, and the stable transport of the original 31 is maintained while illumination for reading is reflected on split faces 16A and 16B to reduce the influence of illumination on the other reading means. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention is suitably realized as a copier, a scanner, or the like, in which a sheet-shaped document is conveyed on a guide supporting means such as a platen glass, and two reading units read images on both sides. The present invention relates to a double-sided image reading device.
[0002]
[Prior art]
The double-sided image reading device can read the images on both the front and back surfaces of the document by passing the sheet-shaped document only once on the guide supporting means. Therefore, the double-sided image reading device does not need to provide an ADF (automatic document feeder) for feeding the document with a reversing conveyance path for turning over the document, so that the ADF can be simplified. It has a number of advantages such as the time required can be shortened and the document is less damaged.
[0003]
A typical prior art of such a double-sided image reading apparatus is disclosed in Japanese Patent Laid-Open No. 4-234258. However, this conventional technique simply includes two optical reading means, and has problems that the size is increased and the cost is increased. As another conventional technique, JP-A-11-27444 has been proposed.
[0004]
FIG. 6 is a cross-sectional view schematically showing a configuration near a reading area according to the related art. In this prior art, a CCD (Charge Coupled Device) optical reading means 52, which is conventionally used in a copying machine and is disposed below a platen glass 51, is fixed at a predetermined position, and a document 53 is conveyed by the ADF. In addition to the configuration for reading the front surface of the original 53, a small and space-saving CIS (contact image sensor) 54 which has been conventionally used in a facsimile apparatus or the like is further placed above the original platen glass 51. The reading of the double-sided image is realized by reading the back surface of the document 53.
[0005]
However, if the document conveying path becomes longer, the apparatus body becomes larger. Therefore, the distance between the first reading position by the CCD optical reading means 52 and the second reading position by the CIS 54 is close to about 20 to 30 mm. It is arranged. For this reason, the irradiation light for reading in each of the CCD optical reading means 52 and the CIS 54 propagates through the platen glass 51 and affects the other adjacent reading means. That is, on the CCD optical reading means 52 side, the image on the front side of the document 53 is overexposed, and on the CIS 54 side, the image on the back side of the document 53 is shown as see-through. A large impact.
[0006]
Conventionally, in order to solve such a problem, the influence of the irradiation light of the other reading unit is suppressed by controlling the amount of light from the light source and partially correcting the images on the front and back surfaces of the read document. Have been. However, there is a limit to such measures, and if these measures are forcibly performed, the image quality of the read image may be adversely affected.
[0007]
Therefore, as another conventional technique that can solve such a problem, there is a double-sided image reading apparatus disclosed in Japanese Patent Application Laid-Open No. H11-32164. FIG. 7 is a cross-sectional view schematically showing a configuration near a reading area according to the related art. 7, portions corresponding to the above-described configuration of FIG. 6 are denoted by the same reference numerals. In this prior art, as in the case of Japanese Patent Application Laid-Open No. H11-27444 in FIG. I have.
[0008]
It is noteworthy in this prior art that the CIS 54 first reads the back side of the original 53, and then reads the front side of the original 53 by the CCD optical reading means 52. A back plate 55 made of metal or the like is provided behind the CIS 54. In this manner, the propagation of the illumination light by the platen glass 51 is prevented, and the overexposure and show-through are prevented without taking the above-described special measures such as the control of the light amount and the correction of the image.
[0009]
[Problems to be solved by the invention]
However, in such a conventional technique, since the material of the guide support means for guiding the document facing the reading means is different, there is a problem that stable conveyance of the document cannot be guaranteed due to the difference in the friction coefficient μ. In particular, it is expected that various types of originals will be used depending on the use environment of the apparatus, and if it is ensured that the originals of all types are stably transported, it is difficult to set a transport system such as torque and timing. is there.
[0010]
SUMMARY OF THE INVENTION It is an object of the present invention to provide a double-sided image reading apparatus capable of removing the influence of each reading illumination light while maintaining stable document conveyance.
[0011]
[Means for Solving the Problems]
In the double-sided image reading apparatus of the present invention, a sheet-shaped document is guided by a plate-shaped guide supporting means having translucency, and reading means for reading an image on one surface is opposite to the document with respect to the guide supporting means. The reading means for reading the document image transmitted through the guide supporting means facing from one side and reading the image on the other side directly reads the document image facing the guiding support means from the same side as the document. In the double-sided image reading apparatus configured to read both front and back images of the original, the guide support unit is provided with a first reading unit disposed relatively upstream in the transport direction and a downstream reading unit. A groove is formed between the second reading means and the second reading means from the surface opposite to the side of the document or the document.
[0012]
According to the above configuration, two reading units are disposed substantially opposite to each other in the document conveying path, and the document is passed between them, so that the image on both sides of the document is read by one reading scan. In the image reading apparatus, the main scanning direction, that is, the document conveying direction, between the first reading means and the second reading means with respect to a single plate-like guide support means such as a platen glass. Make a cut in the vertical direction and cut. Alternatively, a groove is formed on a surface opposite to the original. That is, the document is cut at least on the side opposite to the original.
[0013]
Therefore, the two reading means are provided with guide support means having the same transfer conditions (mainly friction coefficient μ), specifically, the same material and the same guide surface condition such as the same surface roughness. , And the reading light can be reflected on a section plane while maintaining the stable conveyance of the original so as not to affect the other reading means.
[0014]
Further, in the double-sided image reading apparatus of the present invention, for a sheet-shaped document conveyed on the document conveying path, two reading units face each of the front and back surfaces, and the sheet is conveyed once in the document conveying path. In a two-sided image reading apparatus configured to read images on both sides of a document, a guide surface of a first guide supporting unit facing a first reading unit disposed relatively upstream in the document conveying direction. And the guide surface of the second guide support means facing the second reading means arranged on the downstream side is formed under the same transport conditions.
[0015]
According to the above configuration, two reading units are disposed substantially opposite to each other in the document conveying path, and the document is passed between them, so that the image on both sides of the document is read by one reading scan. In the image reading apparatus, the guide supporting means facing the reading means such as a platen glass is provided with a first guiding supporting means corresponding to the first reading means and a second guiding supporting means corresponding to the second reading means. Are formed so that the transfer conditions (mainly the friction coefficient μ) of the guide surface are equal to each other. Specifically, for example, the same material is used, and the state of the guide surface such as the same surface roughness is made the same.
[0016]
Therefore, it is possible to reflect the irradiation light for each reading on the end face of each of the guide supporting means and to keep the other reading means from affecting while maintaining the stable conveyance of the original.
[0017]
Furthermore, the double-sided image reading apparatus according to the present invention is characterized in that a light blocking member is provided between the first guide support means and the second guide support means.
[0018]
According to the above configuration, a light-shielding member is provided between the two guide and support means, and the light-shielding member reliably blocks the irradiation light for reading by the other reading means. This is effective for preventing show-through by a reading unit that directly reads an original image from the same side as the above, and the influence of the irradiation light of the other reading unit can be further reduced.
[0019]
Further, in the double-sided image reading apparatus of the present invention, at least one of the first and second guide and support means is subjected to a roughening treatment on an end face adjacent to the other guide and support means. .
[0020]
According to the above configuration, since the roughening treatment is performed on at least one adjacent end face of the two guide support means, the irradiation light for reading of the other reading means is reflected or scattered on the roughened end face. Is done.
[0021]
Therefore, it is particularly effective for preventing the show-back in the reading means for reading the document image directly from the same side as the document with respect to the guide supporting means, and further reduces the influence of the irradiation light of the other reading means. can do. Further, similar effects can be obtained without using a light shielding member, which is effective in terms of assembly work and manufacturing cost.
[0022]
Still further, the double-sided image reading apparatus according to the present invention is characterized in that at least one of two reading means adjacent to each other, the radiation direction of the irradiation light for reading is a direction away from each other.
[0023]
According to the above configuration, in at least one of the two reading units, the direction of the light source that emits the irradiation light for reading is set to be opposite to the direction of the other reading unit.
[0024]
Therefore, the influence of the illumination light from the light source of the other reading means adjacent to each other can be reduced.
[0025]
BEST MODE FOR CARRYING OUT THE INVENTION
The first embodiment of the present invention will be described below with reference to FIGS.
[0026]
FIG. 1 is a longitudinal sectional view showing the entire configuration of a two-sided image reading apparatus 1 according to a first embodiment of the present invention. The double-sided image reading apparatus 1 generally includes an optical system 2 and an ADF 3 disposed above the optical system 2, and is used as a scanner of the copying machine or the facsimile apparatus.
[0027]
The optical system 2 includes a CCD reading unit 11 serving as a first reading unit. The optical system 2 is placed on a platen glass 12 and an image of a document supported on a plane is scanned by a light source unit 13 and a mirror unit 14. An image is formed on the CCD reading unit 11 provided at a fixed position, and reading is performed. The CCD reading unit 11 includes an imaging lens 11a and a CCD image sensor 11b. The light source unit 13 includes a light source 13a, a mirror 13b for condensing illumination light for reading from the light source 13a at a predetermined reading position on the document table glass 12, and a slit for passing only reflected light from the document. 13c and a mirror 13d for changing the optical path of the light passing through the slit 13c by 90 °. The mirror unit 14 includes a pair of mirrors 14a and 14b for changing the optical path of the light from the light source unit 13 by 180 °. Assuming that the speed of the light source unit 13 is V, the mirror unit 14 is displaced at the speed of V / 2 in the direction of the arrow 15 (sub-scanning direction) as indicated by reference numerals 13e, 13f; Thus, a document image can be read.
[0028]
Further, the optical system 2 is provided with another platen glass 16 which is separated from the platen glass 12 in the sub-scanning direction and is characterized by the present invention as described later. In a state where the light source unit 13 is displaced to a position below the platen glass 16 and is stationary, an image of one surface (hereinafter referred to as a front surface) of the document conveyed on the platen glass 16 is formed. Can be read. A discharge tray 17 is provided near the exit of the conveyed document.
[0029]
On the other hand, the ADF 3 includes a CIS 21 serving as a second reading unit, and takes in the documents placed in a stacked state on the document placing tray 22 one by one. (Hereinafter referred to as the back surface). For this reason, generally, it further includes various rollers R1 to R10, sensors S1 to S6, a curved conveyance path 23, and a registration / skew correction area 24.
[0030]
The original placing tray 22 is an electric tray. When the original placing sensor S1 including an actuator S1a and a sensor main body S1b detects that an original is set on the original placing tray 22, the original placing tray 22 is moved at a predetermined timing. When the loading tray 22 starts to be lifted and the uppermost document of the loaded document stack pushes up the pickup roller R1 supported by the arm 25 so as to be able to move up and down, and when this is detected by the sensor S2, The ascent is stopped temporarily, and in this state, a standby state is set.
[0031]
When a document is set on the document placing tray 22 and the document placing tray 22 rises as described above to be in a standby state, and then is left for a predetermined time, the document loading to a predetermined level is performed. The tray 22 descends and waits.
[0032]
Then, when a document feed start signal is input, the paper feed roller R1 is driven to rotate, and is sequentially taken in from the topmost document of the document bundle. A document separating roller R2 and a document separating plate 26 are disposed downstream of the sheet feeding roller R1, and the document separating plate 26 is urged toward the document separating roller R2 by a spring 27. Therefore, even when a plurality of originals are taken in by the paper feed roller R1, only the uppermost original that is in close contact with the original separating roller R2 is taken in and conveyed to the curved conveyance path 23. Whether or not the document is reliably separated and supplied by the document separating roller R2 is detected by a sensor S3 including an actuator S3a and a sensor main body S3b. Then, at a predetermined timing, it is guided to the curved conveyance path 23 on the downstream side.
[0033]
In the curved conveyance path 23, the original is conveyed by conveyance rollers R3 to R7, and whether or not the document is guided without difficulty includes an actuator S4a and a sensor main body S4b, and a sensor for detecting discharge from the curved conveyance path 23. It is detected by S4. The curved conveyance path 23 has a curvature that allows the manufacturer to guarantee a stable supply of all types of documents, and has a curvature that allows the thickest, that is, the tallest document among the readable documents to be smoothly conveyed. I have.
[0034]
The original discharged from the curved conveyance path 23 is conveyed to the registration / skew correction area 24, and the leading end thereof is located in front of the registration rollers R8 and R9 near the exit of the registration / skew correction area 24. When the detection is made in S5, the registration rollers R8 and R9 are stopped and collided with the conveying force from the upstream side for a predetermined time to correct the registration and the skew. The sensor S5 includes an actuator S5a and a sensor body S5b.
[0035]
The registration / skew correction area 24 is formed as described above in the registration / skew correction area 24 from the last pair of conveyance rollers R6 and R7 to the pair of registration rollers R8 and R9 of the curved conveyance path 23. In order to correct the registration and skew, it is considered that the state of the document is substantially linear between these rollers R6, R7; R8, R9 and is as free as possible from the guide surface of the transport path. This is particularly effective when conveying a stiff original such as a thick original, and is effective when the original is curved, that is, when the side of the curved original is pressed against a part of the conveyance guide. Since it is difficult to correct the resist and the skew, it is attempted to reduce friction by setting the guide surface of the transport path as free as possible as described above.
[0036]
The distance between the rollers R6, R7; R8, R9 may be set so that the length of the smallest document in the transport direction among the documents that can be processed as a document feeder is set to a minimum. That is, the smaller the trailing end portion of the document remaining in the curved conveyance path 23, the smoother the registration and skew correction of the document can be performed.
[0037]
Next, the document on which registration and skew correction has been performed is restarted at a predetermined timing, and is guided to a first reading position for exposing and scanning the surface of the document. Further, the document passes through a second reading position for exposing and scanning the back surface of the document. The light source unit 13 faces the first reading position, and the CIS 21 faces the second reading position.
[0038]
Then, the originals from which the images on the front and back sides of the original have been read are discharged from the original reading apparatus 1 at a position lower than the original discharge point by discharge rollers R10 and R11 (the discharge roller R11 is provided on the optical system 2 side). The paper is discharged onto the paper discharge tray 17 supported on the side of the paper tray. Confirmation of the document discharging operation is detected by a sensor S6 including an actuator S6a and a sensor main body S6b.
[0039]
The above operation is repeated until there are no more documents set on the document tray 22, and all the documents that have been read are sequentially discharged onto the discharge tray 17. Here, the document discharged onto the paper discharge tray 17 is not covered by the document placing tray 22 on the paper discharge tray 17, and the operator can easily visually check the document, and The operation of taking out the processed document from the tray 17 can be easily performed.
[0040]
Further, since the height of the document bundle is lowered each time the document is sequentially fed, the document placing tray 22 is raised by the position of the paper feed roller R1 to be lowered, so that the document bundle is always The uppermost surface and the paper feed roller R1 are monitored so as to maintain a predetermined state. The movement of the document placing tray 22 is controlled by processing the output of the sensor S2 as a level signal.
[0041]
Further, the document placement tray 22 is formed by a curved transport path 23 which is inevitably formed by the curved transport path 23 set so as to guarantee the stable transport of the original as described above. Is vertically movable within the range of the height of the document. By displacing the document vertically, a large amount of documents can be placed, and a large amount of documents placed on the document placing tray 22 can be placed. The uppermost surface of the document is raised to a state in which the document can be fed to the entrance of the curved conveyance path 23, and the document is sequentially fed.
[0042]
FIG. 2 is a cross-sectional view schematically showing a configuration near the double-sided document reading area in the double-sided image reading apparatus 1 configured as described above, that is, near the document table glass 16. 2, parts corresponding to those in FIG. 1 are denoted by the same reference numerals. The document 31 is transported in the transport direction 32 on the platen glass 16 by the ADF 3, and the image of the surface transmitted through the platen glass 16 is firstly read by the CCD reading unit 11 arranged below the platen glass 16. The configuration is the same as that of FIG. 6 in that reading is performed, and then the CIS 21 disposed above the platen glass 16 directly reads the image on the back surface of the document 31 to read a double-sided image. is there.
[0043]
It should be noted that, in the present invention, the platen glass 16 cuts and cuts a single plate-shaped glass in the main scanning direction, that is, in a direction perpendicular to the transport direction 32, thereby forming a CCD. It is configured to be divided into a first guide support 16a facing the reading unit 11 and a second guide support 16b facing the CIS 21.
[0044]
Therefore, the two reading means are provided with guide support portions 16a and 16b having the same transport conditions (mainly friction coefficient μ), specifically, the same material and the same guide surface such as the same surface roughness. The guide support unit in the same state appears, and while maintaining the stable conveyance of the document 31, the respective irradiation light for reading is reflected by the dividing planes 16A and 16B so that the other reading unit is not affected. be able to. As a result, overexposure on the CCD reading unit 11 side and show-through on the CIS 21 side can be prevented, which is particularly effective in preventing show-through. It is desirable that the dividing planes 16A and 16B of the platen glass 16 be rounded or chamfered so that the document 31 is not caught.
[0045]
The CIS 21 has a structure in which a light source 21a that emits illumination light for reading is provided on the upstream side in the transport direction 32, and a CCD line image sensor 21b for reading is provided on the downstream side. Therefore, the radiation direction of the irradiation light from the light source 21a is in a direction away from the CCD reading unit 11, and the influence of the illumination light from the light source 21a on the CCD reading unit 11 can be reduced.
[0046]
A second embodiment of the present invention will be described below with reference to FIG.
[0047]
FIG. 3 is a cross-sectional view schematically showing a configuration near a double-sided document reading area in a double-sided image reading apparatus according to a second embodiment of the present invention. 3, parts corresponding to those in FIG. 2 are denoted by the same reference numerals. The entire configuration of the double-sided image reading apparatus can be realized by, for example, the same configuration as that of FIG. 1 described above, and description thereof will be omitted.
[0048]
It should be noted that in this double-sided image reading apparatus, a light-shielding member 33 is provided between the guide supports 16a and 16b of the document table glass 16. Therefore, since the irradiation light passing through the divisional sections 16A and 16B is reliably blocked, the influence on the other reading means can be further reduced, which is particularly effective in preventing the show-through.
[0049]
A third embodiment of the present invention will be described below with reference to FIG.
[0050]
FIG. 4 is a cross-sectional view schematically showing a configuration near a reading area of a double-sided document in a double-sided image reading apparatus according to a third embodiment of the present invention. In FIG. 4 as well, portions corresponding to FIGS. 2 and 3 are denoted by the same reference numerals. The overall configuration of the double-sided image reading apparatus can also be realized by the same configuration as that of FIG. 1 described above, and a description thereof will be omitted.
[0051]
It should be noted that, in this double-sided image reading apparatus, at least one guide support portion (indicated by reference numeral 36a in FIG. 4) of the platen glass 36, rough surface treatment such as satin finish is applied to the adjacent dividing plane 36A. That is being done. Therefore, the irradiation light for reading from the other reading means is reflected or scattered by the roughened end face. Also in this case, the irradiation light passing through the dividing planes 36A and 16B can be suppressed. Further, the same effect can be obtained without using the above-described light shielding member 33, which is effective in terms of assembly work and manufacturing cost.
[0052]
A fourth embodiment of the present invention will be described below with reference to FIG.
[0053]
FIG. 5 is a cross-sectional view schematically showing a configuration near a reading area of a double-sided document in a double-sided image reading apparatus according to a fourth embodiment of the present invention. In FIG. 5 as well, portions corresponding to FIGS. 2 to 4 are denoted by the same reference numerals.
[0054]
It should be noted that in this double-sided image reading apparatus, the original platen glass 46 is attached to one plate-like glass from the surface opposite to the original 31 in the main scanning direction, that is, perpendicular to the transport direction 32. The groove 47 is formed with a cut in the direction. As a result, the platen glass 46 is attached to the first guide support 46a facing the CCD reading unit 11 on the surface opposite to the original 31, that is, the surface facing the CCD reading unit 11, and to the CIS 21. It is divided into an opposing second guide support portion 46b.
[0055]
Therefore, the same effects as those of the double-sided image reading apparatuses shown in FIGS. 2 to 4 can be obtained, and the guide of the original 31 is continuous, so that the original 31 can be transported more stably.
[0056]
Further, by flowing ink and the like into the groove 47 and solidifying the same, the same effect as the light shielding member 33 can be obtained.
[0057]
【The invention's effect】
As described above, the two-sided image reading apparatus according to the present invention has two reading units arranged substantially opposite to each other in the document conveying path, and the document is passed between the two reading means, so that a single reading scan can be performed on both sides of the document. In an image reading apparatus configured to read an image, a plate-like guide supporting means such as a platen glass is moved between the first reading means and the second reading means in the main scanning direction. That is, a cut is made in a direction perpendicular to the direction in which the document is transported, and the document is separated. Alternatively, a groove is formed on a surface opposite to the original. That is, the document is cut at least on the side opposite to the original.
[0058]
Therefore, the two reading means are provided with guide support means having the same conveyance conditions (mainly friction coefficient μ), specifically, the same material and the same surface roughness such as the same surface roughness. With the same guide and support means, the reading light can be reflected on a section plane while maintaining the stable conveyance of the original so that the other reading means is not affected.
[0059]
Further, as described above, the two-sided image reading apparatus of the present invention arranges two reading means substantially opposite to each other in the document conveying path, and passes the document between them so that the reading of the document can be performed by one reading scan. In an image reading apparatus for reading images on both front and back sides, a guide supporting means such as a platen glass, which faces the reading means, is provided with first guiding support means corresponding to the first reading means and second reading means. The second guide support and the second guide support corresponding to the means are provided so that the transfer conditions (mainly the friction coefficient μ) of the guide surface between them are equal to each other. Specifically, for example, the same material is used, and the state of the guide surface such as the same surface roughness is made the same.
[0060]
Therefore, while maintaining the stable conveyance of the original, it is possible to reflect the irradiation light for each reading on the end face of each of the guide and support means and not to affect the other reading means.
[0061]
Further, as described above, the double-sided image reading apparatus of the present invention provides a light blocking member between the first guide supporting means and the second guide supporting means, and performs another reading by the light blocking member. The illumination light for reading the means is reliably blocked.
[0062]
Therefore, it is particularly effective to prevent the show-back by reading means for reading the document image directly from the same side as the document with respect to the guide supporting means, and to further reduce the influence of the irradiation light of the other reading means. Can be smaller.
[0063]
Further, as described above, the double-sided image reading apparatus of the present invention performs the roughening process on the adjacent end face of at least one of the two guide support means.
[0064]
Therefore, the irradiation light for reading of the other reading means is reflected or scattered at the roughened end face, and particularly, the reading which directly reads the original image facing the guide supporting means from the same side as the original. This is effective in preventing back reflection by means, and the influence of the irradiation light of the other reading means can be further reduced. Further, similar effects can be obtained without using a light shielding member, which is effective in terms of assembly work and manufacturing cost.
[0065]
Furthermore, in the double-sided image reading apparatus of the present invention, as described above, in at least one of the two reading units, the direction of the light source that emits the irradiation light for reading is opposite to the direction of the other reading unit. To do.
[0066]
Therefore, the influence of the illumination light from the light source of the other reading means adjacent to each other can be reduced.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view showing the entire configuration of a double-sided image reading apparatus according to a first embodiment of the present invention.
FIG. 2 is a cross-sectional view schematically showing a configuration near a reading area of a two-sided original in the two-sided original reading apparatus shown in FIG.
FIG. 3 is a cross-sectional view schematically showing a configuration near a reading area of a two-sided document in a two-sided image reading apparatus according to a second embodiment of the present invention.
FIG. 4 is a cross-sectional view schematically showing a configuration near a reading area of a two-sided document in a two-sided image reading apparatus according to a third embodiment of the present invention.
FIG. 5 is a sectional view schematically showing a configuration near a reading area of a two-sided document in a two-sided image reading apparatus according to a fourth embodiment of the present invention.
FIG. 6 is a cross-sectional view schematically showing a configuration in the vicinity of a typical conventional reading area.
FIG. 7 is a cross-sectional view schematically showing a configuration near a reading area according to another conventional technique.
[Explanation of symbols]
1 Double-sided image reader
2 Optical system
3 ADF
11 CCD reading unit (first reading means)
11a Imaging lens
11b CCD image sensor
12 Platen glass
13 Light source unit
13a light source
14 Mirror unit
16,36,46 Platen glass (guide support means)
16a, 36a, 46a First guide support
16b, 46b Second guide support
16A, 36A; 16B section
17 Output tray
21 CIS (second reading means)
21a light source
21b CCD line image sensor
22 Document loading tray
23 Curved transport path
24 Resist / Skew Correction Area
26 Document separation plate
31 manuscript
32 Transport direction
33 Light shielding member
47 grooves
R1 pickup roller
R2 Document separation roller
R3 ~ R7 Transport roller
R8, R9 Registration roller
R10, R11 discharge roller
S1 Document placement sensor
S2 to S6 sensor

Claims (5)

The sheet-shaped document is guided by a plate-shaped guide supporting means having translucency, and reading means for reading an image on one surface faces the guide supporting means from the opposite side of the document to the guide supporting means. The reading means for reading the original image transmitted through the means and reading the image on the other side reads the original image directly from the same side as the original with respect to the guide support means, so that the image on both sides of the original can be read. In a double-sided image reading device that reads
The guide supporting means is provided between the first reading means disposed relatively upstream in the transport direction and the second reading means disposed downstream, and is divided or opposite to the original. A double-sided image reading device, wherein a groove is formed from a surface. Two reading means face the front and back surfaces of a sheet-shaped document conveyed through the document conveyance path, and read the images on both sides of the document in one pass of the document conveyance path. In a double-sided image reading device,
A guide surface of the first guide support means opposed to the first reading means arranged relatively upstream in the document conveying direction, and a second guide face opposed to the second reading means arranged downstream. Wherein the guide surfaces of the guide support means are formed under the same transport conditions. 3. The double-sided image reading apparatus according to claim 2, wherein a light-blocking member is provided between the first guide and support means and the second guide and support means. 3. A double-sided image reading apparatus according to claim 2, wherein at least one of said first and second guide supporting means is subjected to a roughening treatment on an end face adjacent to said other guide supporting means. 3. The double-sided image reading apparatus according to claim 1, wherein at least one of two reading units adjacent to each other emits irradiation light for reading in a direction away from each other.

Images