JP6531720B2 - Image reader - Google Patents

Description

  The present invention relates to an image reading apparatus that reads an image based on reflected light from a document.

  2. Description of the Related Art Conventionally, image forming apparatuses such as a copying machine, a facsimile, a scanner, an MFP, and the like provided with an image reading apparatus that reads an image based on reflected light from a contact glass are known. Generally, this type of image reading apparatus is roughly divided into an image reading apparatus of a reduction optical system type and an image reading apparatus of an equal magnification optical system type.

  A reduction optical system type image reading apparatus usually includes a plurality of mirrors and one optical lens, and the reflected light from the contact glass is guided to the optical lens by the mirror, and the reduction optical system is an image sensor that functions as a photoelectric conversion unit. The image is formed to perform image reading. The length in the main scanning direction of the image sensor used in the image reading apparatus of the reduction optical system type is about 1/5 to 1/9 of the length of the image reading area in the main scanning direction of the contact glass.

  On the other hand, an image reader of the same magnification optical system type usually comprises a rod lens array in which a plurality of rod lenses are arranged in an array, and reflected light from the contact glass is a rod lens array adjacent to the contact glass. An image sensor is made to form an equal-magnification optical image for image reading (see Patent Document 1). In the image sensor used in the image reader of the same magnification optical system type, when the distance between the document and the image sensor changes, the image magnification of each rod lens is different, and the image blur due to the image blur occurs in the read image. It is easy for trouble to occur. When a lens is used as the imaging optical system, the length of the rod lens array in the main scanning direction is approximately the same as the length of the image reading area in the main scanning direction of the contact glass.

  The image reading apparatus of the equal magnification optical system type is a reduction optical system type in which the conjugate length TC represented by the distance from the document to the image sensor at the image reading position is as short as about 10 to 20 mm and the conjugate length TC is about 200 to 500 mm. As compared with the image reading apparatus of the present invention, the apparatus can be miniaturized. On the other hand, since the same magnification optical system type image reading apparatus uses a rod lens array as an imaging optical system, the rod lens array should have a misaligned portion such as a portion where the document floats from the contact glass at the image reading position. The light of the wavelength using the light is focused at a different distance from the difference in refractive index, so the color blurs, and the magnification is different at the central portion and the peripheral portion, and chromatic aberration occurs. In order to suppress the occurrence of such chromatic aberration, a plurality of lenses for chromatic aberration correction are required, and the number of parts constituting the optical system increases.

  As an image reading apparatus which solves the above-mentioned problem, an image reading apparatus using a reflection mirror array in which a plurality of reflection mirrors are arranged in an array form has been proposed (see Patent Document 2). The image reading device disclosed in Patent Document 2 performs image reading by forming a reduced inverted image on the image sensor by reflecting light from the contact glass with a reflection mirror array.

JP 2003-121608 A US Patent Application Publication No. 2010/0002273

  Since the light reflected from the contact glass is scattered in various directions, the light reaching the reflection mirror array is incident on each reflection mirror at various angles. The light incident at a specific angle on the boundary between a reflection mirror in the reflection mirror array and the reflection mirror adjacent to the reflection mirror is reflected by the boundary at the light reception surface of the image sensor. It may be incident on a light receiving area corresponding to the reflection mirror. Thus, when light generated at the boundary with the reflection mirror adjacent to the one reflection mirror enters the light reception area corresponding to the one reflection mirror on the light reception surface of the image sensor, the light is imaged in the light reception area. In the read image based on the optical image, an image blur occurs due to the flare phenomenon.

  An object of the present invention is to suppress generation of chromatic aberration in an imaging optical system and to suppress generation of an image blur due to a flare phenomenon in a read image in an image reading apparatus for reading an image based on reflected light. Providing an image reading apparatus capable of

An image reading apparatus according to one aspect of the present invention is an image reading apparatus that reads an image based on reflected light from a document in a predetermined image reading area, and light that irradiates light to the document in the image reading area It comprises: an irradiation unit; an optical system for forming an image of reflected light from a document irradiated with light by the light irradiation unit; and a photoelectric conversion unit for converting an optical image formed by the optical system into an electric signal . The optical system is a reflection mirror unit that reflects light reflected from a document to the photoelectric conversion unit and forms an image on the photoelectric conversion unit, and the first reflection area and the second reflection area provided continuously in the main scanning direction A reflection mirror portion having a reflection area, a first diaphragm portion disposed on an imaging light path from the reflection mirror portion to the photoelectric conversion portion, a first light shielding portion having a light shielding property, and the first light shielding portion A first diaphragm having a first light passage hole and a second light passage hole, which are formed to penetrate the portion, and through which light reflected by each of the first reflection region and the second reflection region is allowed to pass; A second diaphragm unit disposed between the first diaphragm unit and the photoelectric conversion unit on the imaging light path, and passing through a second light shielding unit having a light shielding property and the second light shielding unit. And each of the first light passage hole and the second light passage hole are formed. The includes a third light passage hole and the fourth light transmission hole for passing a second narrowed portion having, a. The photoelectric conversion portion is a light receiving surface in which a first light receiving area and a second light receiving area for receiving light passing through each of the third light passing hole and the fourth light passing hole are provided along the main scanning direction. And a line image sensor that converts each of an optical image based on light received by each of the first light receiving area and the second light receiving area into an electrical signal. The shape of each of the first light passing hole and the second light passing hole in the first stop is a rectangular shape, and the third light passing hole and the fourth light pass in the second stop are Each shape is circular.

  According to this image reading apparatus, the image reading is performed based on the reflected light from the original in the image reading area. An optical system for focusing light reflected from a document in an image reading area on a photoelectric conversion unit includes: a reflection mirror unit; a first diaphragm unit disposed on an imaging light path from the reflection mirror unit to the photoelectric conversion unit; The imaging optical path includes a second diaphragm disposed between the first diaphragm and the photoelectric conversion unit. Since the reflected light from the original in the image reading area is reflected to the photoelectric conversion section by each of the first reflection area and the second reflection area in the reflection mirror section, the imaging optical system using the lens of the prior art It is possible to suppress the occurrence of such chromatic aberrations.

  Further, since the first stop is disposed on the imaging light path from the reflection mirror to the photoelectric conversion unit, the light generated at the boundary between the first reflection area and the second reflection area in the reflection mirror is The light can be blocked by the first light blocking portion of the first stop. Therefore, light generated at the boundary between the first reflection region and the second reflection region in the reflection mirror portion passes through the first light passing hole and the second light passing hole of the first diaphragm portion, and further, It is possible to restrict the light from entering the light receiving surface of the photoelectric conversion unit through the third light passage hole and the fourth light passage hole of the diaphragm. As a result, it is possible to suppress the occurrence of image blurring due to the flare phenomenon in the read image based on the optical image formed on the light receiving surface of the photoelectric conversion unit.

Further, in the above-described image reading apparatus, each of the first light passing hole and the second light passing hole in the first apertured portion has a rectangular shape, and the third light passing in the second apertured portion each of the shape of the hole and the fourth light passage hole, Ru circular der.

  According to this image reading apparatus, only the light that causes the image blurring due to the flare phenomenon, which is generated at the boundary between the first reflection area and the second reflection area in the reflection mirror, is the first light shielding of the first diaphragm. Light-receiving holes of the first diaphragm and the third light-passing hole of the second diaphragm and the fourth light-passing hole of the second diaphragm. It is possible to pass imaging light for forming an optical image on a surface.

In the above image reading apparatus, wherein the first diaphragm portion and the second diaphragm portion, it is preferably formed on one body. In the image reading apparatus described above, wherein the first throttle portion and said reflecting mirror portion and the second diaphragm portion, it is preferably formed on one body.

  According to this image reading apparatus, in the optical system for forming an optical image on the photoelectric conversion unit, the positional relationship among the three members of the reflection mirror unit, the first diaphragm unit, and the second diaphragm unit can be maintained with high accuracy. At the same time, when a temperature change occurs according to the use situation of the image reading apparatus, it is possible to suppress the occurrence of a difference in thermal expansion or thermal contraction between the three parties. Therefore, in the optical system including the reflection mirror unit, the first stop unit, and the second stop unit, it is possible to suppress the deterioration of the imaging performance with respect to the photoelectric conversion unit.

  In the above-described image reading apparatus, it is desirable that the reflection mirror unit is a telecentric optical system that causes an image of light reflected from a document to be inverted.

  According to this image reading apparatus, since the reflection mirror portion is a telecentric optical system, the light is reflected by each of the first reflection region and the second reflection region of the reflection mirror portion, and the first light passing hole and the first light passage of the first diaphragm portion are The chief ray, which is light passing through the centers of the second light passage hole and the third light passage hole and the fourth light passage hole of the second diaphragm, is parallel to the optical axis (that is, with respect to the light receiving surface of the photoelectric conversion unit Vertical). Therefore, even if there is an original position offset portion such as a floating portion of the original in the image reading area, an image is formed on each of the first light receiving area and the second light receiving area on the light receiving surface of the photoelectric conversion unit. There is less difference in the imaging magnification of the optical image. As a result, the occurrence of image blurring due to image blurring can be suppressed in the read image, and an image reader with a deep depth of field can be obtained.

  In the above-described image reading apparatus, each of the first reflection area and the second reflection area in the reflection mirror portion is an optical image formed of an inverted image reduced at a predetermined reduction ratio, the first image on the light receiving surface. A light blocking wall having a light blocking property is provided at the boundary between the first light receiving area and the second light receiving area on the light receiving surface, which is configured to form an image on each of the light receiving area and the second light receiving area. Is desirable.

  According to this image reading apparatus, the light blocking wall is provided at the boundary between the first light receiving area and the second light receiving area on the light receiving surface of the photoelectric conversion unit. To prevent part of the light having passed through the first light passing hole of the first stop and the third light passing hole of the second stop from being incident on the second light receiving area, and the second of the reflection mirror A part of the light that is reflected by the reflection area and has passed through the second light passage hole of the first diaphragm and the fourth light passage hole of the second diaphragm is prevented from entering the first light receiving region it can. Therefore, the formation of a ghost image in the read image can be suppressed.

  In the above-described image reading apparatus, in an image recorded on a document according to an electrical signal by the photoelectric conversion unit based on each of the optical image formed in each of the first light receiving area and the second light receiving area. The image processing apparatus further comprises an image data generation unit that generates corresponding image data. The image data generation unit is a processing unit that performs processing on each of the optical images formed in each of the first light receiving region and the second light receiving region, and performs enlargement with an enlargement ratio that is the reciprocal of the reduction ratio. It is desirable to include an enlargement processing unit, an inversion processing unit that inverts the inverted image to form an erect image, and a combining processing unit that combines the images processed by the enlargement processing unit and the inversion processing unit. .

  According to this image reading apparatus, in the image data generation unit, the enlargement processing unit calculates the inverse of the reduction ratio for each of the optical images formed in the first light receiving area and the second light receiving area of the photoelectric conversion unit. Magnification is performed at the magnification ratio, and a reverse processing unit reverses the inverted image into an erect image, and a combining processing unit combines the respective images after the enlargement and reverse processing. Image data corresponding to the image recorded on the original can be generated by each process in the image data generation unit.

  According to the present invention, in an image reading apparatus that reads an image based on reflected light from a document, generation of chromatic aberration in the imaging optical system is suppressed, and image blurring due to flare phenomenon occurs in the read image. It is possible to provide an image reader which can be suppressed.

FIG. 1 is a cross-sectional view showing a schematic configuration of an image reading apparatus according to an embodiment of the present invention. It is a perspective view which shows the structure of the optical structure in the image reading apparatus shown in FIG. 1, and a photoelectric conversion part. It is the perspective view seen from the side which opposes the photoelectric conversion part of the optical structure shown in FIG. FIG. 2 is a light path diagram showing an imaging light path in the image reading apparatus shown in FIG. 1; It is a schematic diagram for demonstrating the relationship of the imaging light and flare light which were reflected by the reflective mirror array in an optical structure. It is a graph which shows the relationship between the deviation | shift amount from the reference position of the flare light control aperture | diaphragm part in an optical structure, and the light quantity ratio with respect to the reference | standard imaging light quantity.

  Hereinafter, an image reading apparatus according to an embodiment of the present invention will be described based on the drawings. FIG. 1 is a cross-sectional view showing a schematic configuration of an image reading apparatus 1 according to an embodiment of the present invention. The image reading apparatus 1 according to the present embodiment is an apparatus for reading an image based on reflected light from a document in a predetermined image reading area. In the example shown in FIG. 1, the image reading device 1 reads an image based on the reflected light from the document 8 placed in the image reading area on the document placement surface 71 of the contact glass 7. The contact glass 7 is formed in a rectangular plate shape, and is supported by a frame-shaped contact glass support portion 72. In a state where the contact glass 7 is supported by the contact glass support portion 72, the inner region of the contact glass support portion 72 becomes an image reading region on the document placement surface 71 of the contact glass 7. The image reading apparatus 1 is mounted as an apparatus for executing an image reading mechanism in an image forming apparatus such as, for example, a copying machine, a multifunction machine, a facsimile, a scanner, and an MFP.

  The image reading apparatus 1 includes a carriage 2, a light irradiation unit 3, an optical system 4, a photoelectric conversion unit 5, and an image data generation unit 6.

  The carriage 2 is a molded product made of, for example, a synthetic resin. Carriage 2 is disposed opposite to document placement surface 71 of contact glass 7, and has a predetermined first direction along document placement surface 71 (for example, in the sub-scanning direction, along the long side of contact glass 7). Can move in the The carriage 2 is configured to be movable in the first direction by a moving mechanism using a driving device such as a stepping motor. The carriage 2 includes a carriage body 21 and a lid 22. The carriage body 21 is open at the upper side and has an internal space, and is formed in a rectangular parallelepiped shape which is long in a second direction (main scanning direction) parallel to the document placement surface 71 and perpendicular to the first direction. The carriage body 21 accommodates the light emitting unit 3, the optical system 4, and the photoelectric conversion unit 5.

  In the carriage 2, the lid 22 is attached to the peripheral end of the opening so as to close the opening on the upper side of the carriage body 21. The lid 22 is formed with narrow first slits 221 and second slits 222 extending in the longitudinal direction (the same direction as the second direction). The first slit 221 is a through hole for guiding the light emitted from the light irradiation unit 3 described later to the outside of the carriage 2. The second slit 222 receives the reflected light from the document 8 placed in the image reading area on the document placement surface 71 of the contact glass 7 into the inside of the carriage 2 and makes the first flat mirror 42 in the optical system 4 described later It is a through hole which leads.

  The light emitting unit 3 is disposed in the carriage body 21 of the carriage 2. The light emitting unit 3 applies light to the document 8 placed in the image reading area on the document placement surface 71 of the contact glass 7 through the first slit 221. The light irradiator 3 includes, for example, a plurality of light emitting diodes (LEDs) arranged along the second direction.

  The optical system 4 is disposed in the carriage body 21 of the carriage 2. The optical system 4 causes the reflected light from the document 8 placed on the image reading area of the document placement surface 71 to which light is emitted by the light emitting unit 3 to form an image on the photoelectric conversion unit 5 described later. In the present embodiment, the optical system 4 includes an optical structure 41, a first flat mirror 42, and a second flat mirror 43. In the optical system 4, the optical structure 41 includes a reflection mirror array 411 which is an example of a reflection mirror, a flare light restriction diaphragm 413 which is an example of a first diaphragm, and a light flux restriction which is an example of a second diaphragm. And an aperture portion 412.

  The first flat mirror 42 is a flat reflection mirror extending along the second direction, and is placed on the image reading area of the document placement surface 71 to be incident after passing through the second slit 222. The reflected light from the original 8 is reflected and guided to the reflection mirror array 411. The second flat mirror 43 is a reflecting mirror formed in a planar shape extending along the second direction, reflects the light reflected by the reflecting mirror array 411, and guides the light to the flare light regulation stop 413.

  The configurations of the optical structure 41 and the photoelectric conversion unit 5 in the image reading device 1 of the present embodiment will be described in detail with reference to FIGS. 2 to 4. FIG. 2 is a perspective view showing the configuration of the optical structure 41 and the photoelectric conversion unit 5 in the image reading device 1 shown in FIG. FIG. 3 is a perspective view of the optical structure 41 shown in FIG. 2 as viewed from the side facing the photoelectric conversion unit 5. FIG. 4 is a light path diagram showing an imaging light path in the image reading apparatus 1 shown in FIG. In the optical structure 41, the reflection mirror array 411 reflects light, but in the optical path diagram shown in FIG. 4, the reflection mirror array 411 is shown as transmitting light.

  In the optical structure 41, the reflection mirror array 411 reflects the second flat mirror 43 from the reflected light from the original 8 placed on the image reading area of the original placement surface 71 and guided by the first flat mirror 42. The light is reflected to the photoelectric conversion unit 5, and an image is formed on the photoelectric conversion unit 5. As shown in FIG. 2, the reflection mirror array 411 has a plurality of curved reflection regions provided continuously in an array in the second direction. The reflective mirror array 411 may be configured to have at least a first reflective area 411a and a second reflective area 411b as reflective areas, and the number of reflective areas is not limited. In the example shown in FIG. 2, the reflection mirror array 411 includes six of the first reflection area 411a, the second reflection area 411b, the third reflection area 411c, the fourth reflection area 411d, the fifth reflection area 411e, and the sixth reflection area 411f. One reflection area is continuously provided in the form of an array in the second direction.

  Since the reflected light from the document 8 placed in the image reading area of the document placement surface 71 is scattered in various directions, the light reflected by the first plane mirror 42 and reaching the reflection mirror array 411 is the first The light is incident on each of the sixth to sixth reflection areas 411a to 411f at various angles. The light incident on each of the first to sixth reflection areas 411 a to 411 f of the reflection mirror array 411 and reflected by each of the first to sixth reflection areas 411 a to 411 f is the first light on the light receiving surface 51 of the photoelectric conversion unit 5. Images are formed on each of the first to sixth light receiving areas 51a to 51f. However, the light incident at a specific angle on the boundary between the one reflection area in the reflection mirror array 411 and the reflection area adjacent to the one reflection area, and the light reflected by the boundary is received by the photoelectric conversion unit 5 In some cases, light may be incident on the light receiving area corresponding to the one reflection area on the surface 51. Thus, the light (hereinafter referred to as “flare light”) generated at the boundary with the reflection area adjacent to the one reflection area corresponds to the one reflection area on the light receiving surface 51 of the photoelectric conversion unit 5. When the light is incident on the light receiving area, an image blur due to the flare phenomenon occurs in the read image based on the optical image formed on the light receiving area. Therefore, the optical structure 41 of the present embodiment includes the flare light regulation diaphragm 413 for regulating the incidence of flare light on each of the first to sixth light reception areas 51a to 51f in the light reception surface 51 of the photoelectric conversion unit 5. Prepare.

  In the optical structure 41, the flare light regulation stop 413 is disposed on the imaging light path from the reflection mirror array 411 to the photoelectric conversion unit 5.

  The flare light restricting portion 413 is formed to extend through the flare light restricting light shielding portion 413A (first light shield portion) having a light shielding property, which is formed extending along the second direction, and the flare light restricting light shielding portion 413A. And a plurality of light passage holes. The flare light regulation stop portion 413 may be configured to have at least a first flare light regulation passage hole 413a (first light passage hole) and a second flare light regulation passage hole 413b (second light passage hole) as light passage holes. The number of light passing holes is not limited. In the example shown in FIG. 2, the flare light regulation stop portion 413 has the same number of six light passage holes as the reflection area of the reflection mirror array 411, the first flare light restriction passage hole 413 a and the second flare light restriction passage hole The third flare light regulation passage hole 413c, the fourth flare light regulation passage hole 413d, the fifth flare light regulation passage hole 413e, and the sixth flare light regulation passage hole 413f penetrate the flare light regulation light shielding portion 413A. It arranges along the said 2nd direction.

  FIG. 5 is a schematic view for explaining the relationship between the imaging light reflected by the reflection mirror array 411 in the optical structure 41 and the flare light. The flare light regulation diaphragm 413 blocks flare light of the light reflected by the reflection mirror array 411 and guided by the second plane mirror 43 by the flare light regulation light block 413A, and regulates passage of the flare light. . In the flare light restricting portion 413, the first flare light restricting hole 413a, the second flare light restricting hole 413b, the third flare light restricting hole 413c, the fourth flare light restricting hole 413d, and the fifth flare light. The regulation passage hole 413e and the sixth flare light regulation passage hole 413f are respectively the first reflection region 411a, the second reflection region 411b, the third reflection region 411c, the fourth reflection region 411d, and the fifth reflection region in the reflection mirror array 411. The flare light of the light reflected by each of 411 e and the sixth reflection area 411 f and guided by the second plane mirror 43 passes the cut imaging light.

  Specifically, as shown in FIG. 5A, the first flare light regulation passage hole 413a is flare light generated at the boundary portion of the second reflection area 411b of the reflection mirror array 411 with the first reflection area 411a. The image forming light reflected by the first reflection area 411a in the reflection mirror array 411 is allowed to pass while the light is blocked by the flare light regulation and shielding portion 413A. In the second flare light regulation passage hole 413b, flare light generated at the boundary between the first reflection area 411a of the reflection mirror array 411 and the second reflection area 411b of the third reflection area 411c is blocked by the flare light regulation light shielding portion 413A. In this state, the imaging light reflected by the second reflection area 411b in the reflection mirror array 411 is allowed to pass. In the third flare light regulation passage hole 413c, flare light generated at the boundary between the second reflection area 411b of the reflection mirror array 411 and the third reflection area 411c of the fourth reflection area 411d is blocked by the flare light regulation light shielding portion 413A. In this state, the imaging light reflected by the third reflection area 411c in the reflection mirror array 411 is allowed to pass. In the fourth flare light regulation passage hole 413d, flare light generated at the boundary between the third reflection area 411c of the reflection mirror array 411 and the fourth reflection area 411d of the fifth reflection area 411e is blocked by the flare light regulation light shielding portion 413A. In this state, the imaging light reflected by the fourth reflection area 411 d in the reflection mirror array 411 is allowed to pass. In the fifth flare light regulation passage hole 413e, flare light generated at the boundary between the fourth reflection area 411d of the reflection mirror array 411 and the fifth reflection area 411e of the sixth reflection area 411f is blocked by the flare light regulation light shielding portion 413A. In this state, the imaging light reflected by the fifth reflection area 411e in the reflection mirror array 411 is allowed to pass. The sixth flare light regulation passage hole 413 f is reflected in a state where flare light generated at the boundary portion of the fifth reflection region 411 e of the reflection mirror array 411 with the sixth reflection region 411 f is blocked by the flare light regulation light shielding portion 413 A. The imaging light reflected by the sixth reflection area 411 f in the mirror array 411 is allowed to pass.

  The light having passed through each of the first to sixth flare light regulation passage holes 413 a to 413 f in the flare light regulation diaphragm 413 is guided to the light beam regulation diaphragm 412. The light beam restriction diaphragm 412 is disposed between the flare light restriction diaphragm 413 and the photoelectric conversion unit 5 on the imaging light path from the reflection mirror array 411 to the photoelectric conversion unit 5.

  The light beam restriction diaphragm 412 includes a plurality of light beam restriction light shields 412A (second light shields) having a light shielding property formed extending along the second direction, and a plurality of light flux restriction light shields 412A. And a light passage hole of The light beam restriction diaphragm part 412 may be configured to have at least a first light beam restriction passage hole 412a (third light passage hole) and a second light beam restriction passage hole 412b (fourth light passage hole) as light passage holes, The number of light passing holes is not limited. In the example shown in FIG. 3, the light beam restriction diaphragm 412 has the same number of six light passage holes as the reflection area of the reflection mirror array 411, ie, the first light beam restriction passage hole 412a, the second light beam restriction passage hole 412b, The three light flux restriction passing holes 412c, the fourth light flux restriction passing holes 412d, the fifth light flux restriction passing holes 412e, and the sixth light flux restriction passing holes 412f are arrayed along the second direction through the light flux restriction light shielding portion 412A. It will be done. In the light flux restricting portion 412, the first light flux restricting through hole 412a, the second light flux restricting through hole 412b, the third light flux restricting through hole 412c, the fourth light flux restricting through hole 412d, the fifth light flux restricting through hole 412e and the fifth Each of the six light flux regulation passage holes 412f has a circular shape in plan view.

  The light beam restriction diaphragm 412 blocks part of the light passing through each of the first to sixth flare light restriction passage holes 413a to 413f in the flare light restriction diaphragm 413 by the light beam restriction light shield 412A to restrict the light flux. Do. Then, in the light beam restriction diaphragm 412, the first light beam restriction passage hole 412a, the second light beam restriction passage hole 412b, the third light beam restriction passage hole 412c, the fourth light beam restriction passage hole 412d, the fifth light beam restriction passage hole 412e and the fifth The six light flux restriction passage holes 412 f respectively pass the light having passed through each of the first to sixth flare light restriction passage holes 413 a to 413 f in the flare light restriction diaphragm 413. Each of the first light flux restriction passing hole 412a, the second light flux restriction passing hole 412b, the third light flux restriction passing hole 412c, the fourth light flux restriction passing hole 412d, the fifth light flux restriction passing hole 412e and the sixth light flux restriction passing hole 412f The transmitted light is imaged on the photoelectric conversion unit 5.

  The photoelectric conversion unit 5 is disposed in the carriage body 21 of the carriage 2. The photoelectric conversion unit 5 converts an optical image formed by the optical system 4 into an electrical signal. The photoelectric conversion unit 5 is a line image sensor extending along the second direction. The photoelectric conversion unit 5 includes a first light flux regulation passage hole 412a, a second light flux regulation passage hole 412b, a third light flux regulation passage hole 412c, a fourth light flux regulation passage hole 412d, a fifth light flux regulation passage hole 412e and a sixth light flux regulation. The first light receiving area 51a, the second light receiving area 51b, the third light receiving area 51c, the fourth light receiving area 51d, the fifth light receiving area 51e, and the sixth light receiving area 51f receive the light passing through each of the passage holes 412f. It has a light receiving surface 51 provided along two directions. The photoelectric conversion unit 5 is based on light received by each of the first light receiving area 51a, the second light receiving area 51b, the third light receiving area 51c, the fourth light receiving area 51d, the fifth light receiving area 51e, and the sixth light receiving area 51f. Each of the images is converted to an electrical signal.

  In the light receiving surface 51 of the photoelectric conversion unit 5, the first to sixth light receiving regions 51a to 51f may be provided at predetermined intervals along the second direction, but in the present embodiment, the first to sixth light receiving regions 51a to 51f are provided. It is provided continuously along two directions. Furthermore, in the photoelectric conversion unit 5 of the present embodiment, the length of the light receiving surface 51 in the second direction is the length of the image reading area on the document placement surface 71 of the contact glass 7 in the second direction. Is set above.

  The photoelectric conversion unit 5 includes the light receiving elements constituting each of the first light receiving area 51a, the second light receiving area 51b, the third light receiving area 51c, the fourth light receiving area 51d, the fifth light receiving area 51e, and the sixth light receiving area 51f. It arranges continuously along the said 2nd direction. As a light receiving element, for example, a complementary metal oxide semiconductor (CMOS) image sensor or a charge coupled device (CCD) image sensor is used. In the image reading device 1 of the present embodiment, the conjugate length TC represented by the distance from the document placement surface 71 of the contact glass 7 to the photoelectric conversion unit 5 is about 10 to 20 mm.

  In the image reading apparatus 1 configured as described above, the carriage 2 is moved in the first direction by the drive device with respect to the document 8 in a state where the document 8 is placed on the document placement surface 71 of the contact glass 7 Ru. Then, the light emitted from the light emitting unit 3 to the image reading area on the document placement surface 71 of the contact glass 7 while the carriage 2 is moving is scanned in the first direction. Reflected light from the document 8 placed on the image reading area of the document placement surface 71 irradiated with light by the light irradiation unit 3 is directed to the reflection mirror array 411 of the optical structure 41 by the first flat mirror 42. It is reflected. The light reaching the reflection mirror array 411 is reflected toward the second plane mirror 43 by the first to sixth reflection areas 411a to 411f. The light that has reached the second flat mirror 43 is reflected toward the flare light restriction diaphragm 413 of the optical structure 41. Of the light reaching the flare light regulation diaphragm 413, the light having passed through each of the first to sixth flare light regulation passage holes 413a to 413f is the first to sixth light flux regulation passage holes 412a of the luminous flux restriction diaphragm 412. The light beams pass through each of the light-receiving regions 51 a to 51 f of the light-receiving surface 51 of the photoelectric conversion unit 5. The photoelectric conversion unit 5 converts each of the optical images based on the light received by each of the first to sixth light receiving areas 51a to 51f into an electrical signal, whereby the image of the document 8 is read.

  According to the image reading apparatus 1 of the present embodiment, the optical system 4 for forming the reflected light from the document 8 placed on the image reading area on the document placement surface 71 of the contact glass 7 on the photoelectric conversion unit 5 is The optical structure 41 includes a reflection mirror array 411, a flare light restriction diaphragm 413, and a light beam restriction diaphragm 412. The configuration is such that the reflected light from the document 8 placed in the image reading area on the document placement surface 71 is reflected to the photoelectric conversion unit 5 by each of the first to sixth reflection areas 411a to 411f in the reflection mirror array 411. Therefore, it is possible to suppress the occurrence of the chromatic aberration as in the imaging optical system using the lens of the prior art.

  In addition, since the flare light regulation stop 413 is disposed on the imaging light path from the reflection mirror array 411 to the photoelectric conversion unit 5, one reflection area in the reflection mirror array 411 and the one reflection area are adjacent to each other. Flare light generated at the boundary with the reflection area can be blocked by the flare light regulation light shielding portion 413A. Therefore, it is restricted that flare light generated at the boundary with the reflection area adjacent to the one reflection area is incident on the light reception area corresponding to the one reflection area on the light receiving surface 51 of the photoelectric conversion unit 5. Can. As a result, it is possible to suppress the occurrence of image blurring due to the flare phenomenon in the read image based on the optical image formed on each of the first to sixth light receiving areas 51a to 51f in the light receiving surface 51 of the photoelectric conversion unit 5. it can.

  Here, in the image reading apparatus of the prior art disclosed in Patent Document 2, the light reflected by each reflection mirror constituting the reflection mirror array is received, and the cell size corresponding to the reduction magnification of the imaging optical image is used. A special image sensor is used in which a plurality of photoelectric conversion elements are discretely disposed on a base substrate. The use of a special image sensor in the image reading apparatus raises the cost as compared with the case of using a highly versatile line image sensor in which a plurality of light receiving areas are continuously provided. In addition, when it is set as said special image sensor, since the photoelectric conversion element is discretely arrange | positioned, the light reception area with respect to the light reflected by each reflection mirror will become small. Therefore, in order to maintain the image reading speed in the image reading apparatus at a high level, it is necessary to use a light source capable of irradiating the contact glass with light with high illuminance, and it is difficult to provide an apparatus configuration for energy saving. It becomes.

  In the image reading apparatus 1 according to the present embodiment, the photoelectric conversion unit 5 reflects light reflected by each of the first to sixth reflection areas 411a to 411f of the reflection mirror array 411 as compared to the image reading apparatus according to the related art. The first to sixth light receiving areas 51a to 51f for receiving light have a light receiving surface 51 which is continuous along the second direction. In the photoelectric conversion unit 5, the length of the light receiving surface 51 along the second direction is set to be equal to or longer than the length of the image reading area on the document placement surface 71 along the second direction. That is, the photoelectric conversion unit 5 is not a special image sensor used in a conventional image reading apparatus in which photoelectric conversion elements are discretely disposed on a base substrate, but is a highly versatile line image sensor. In the photoelectric conversion unit 5, since the first to sixth light receiving areas 51a to 51f constituting the light receiving surface 51 are continuously arranged, the special image sensor of the prior art in which the photoelectric conversion elements are discretely arranged In comparison, the light receiving area for light reflected by each of the first to sixth reflection areas 411a to 411f in the reflection mirror array 411 is large. Therefore, it is not necessary to form the light irradiation unit 3 capable of irradiating light with high illuminance to the document placement surface 71, and it is possible to obtain the image reading apparatus 1 capable of achieving energy saving.

  Furthermore, since the flare light regulation stop unit 413 and the light beam regulation stop unit 412 are disposed on the imaging optical path from the reflection mirror array 411 to the photoelectric conversion unit 5, the first to sixth of the reflection mirror array 411 are provided. First to sixth flare light regulation passage holes 413a to 413f of flare light regulation diaphragm 413 and first to sixth light flux regulation passage of luminous flux regulation diaphragm 412 of the light reflected by each of reflection regions 411a to 411f It can be led to each of the first to sixth light receiving areas 51a to 51f of the light receiving surface 51 of the photoelectric conversion unit 5 by passing through the holes 412a to 412f. Therefore, as the photoelectric conversion unit 5 on which an optical image is formed by the optical system 4, a highly versatile line image sensor having a light receiving surface 51 on which the first to sixth light receiving regions 51a to 51f are continuously arranged. Even when it is used, the light reflected by each of the first to sixth reflection areas 411a to 411f of the reflection mirror array 411 can be imaged in each of the first to sixth light receiving areas 51a to 51f.

  In addition, since each of the first to sixth light flux regulating passage holes 412a to 412f in the light beam regulating stop portion 412 has a circular shape in plan view, it passes through each of the first to sixth light flux regulating passage holes 412a to 412f. The spot shape of the formed imaging light is circular. However, the spot shape of the imaging light corresponding to the boundary between the one reflection area in the reflection mirror array 411 and the reflection area adjacent to the one reflection area is a semicircular shape as shown in FIG. 5 (B). It becomes. At the boundary between one reflection area of the reflection mirror array 411 and the reflection area adjacent to the one reflection area, flare light is generated in contact with the semicircular chord in the imaging light. Therefore, when the planar view shape of each of the first to sixth flare light regulation passage holes 413a to 413f in the flare light regulation aperture 413 is set to a circular shape, a part of the flare light may be transmitted, or It blocks part of the image light. Therefore, as shown in FIG. 2, it is desirable that the shape of each of the first to sixth flare light regulation passage holes 413 a to 413 f in the flare light regulation aperture 413 be rectangular. By this, it is possible to pass the imaging light in a state where only the flare light generated at the boundary between the one reflection area in the reflection mirror array 411 and the reflection area adjacent to the one reflection area is blocked.

  Also, as described above, flare light is generated in contact with the semicircular chord of the imaging light at the boundary between the one reflection area of the reflection mirror array 411 and the reflection area adjacent to the one reflection area. Therefore, in order to block only the flare light without blocking the imaging light, the arrangement position of the flare light regulation diaphragm 413 on the imaging optical path from the reflection mirror array 411 to the photoelectric conversion unit 5 is made with high accuracy. It is necessary to set it. FIG. 6 is a graph showing the relationship between the amount of deviation from the reference position of the flare light restriction diaphragm 413 in the optical structure 41 and the ratio of the amount of light to the amount of reference imaging light.

  As is apparent from the graph of FIG. 6, a position (in the horizontal axis of the graph) at which the flare light restricting portion 413 has moved by +0.1 mm from the reference position (the position where the shift amount in the horizontal axis of the graph is “0”). When the displacement amount is arranged at “+0.1”, a part of the imaging light is blocked, and the light amount of the imaging light is reduced by about 20%. In addition, when the flare light regulation stop portion 413 is disposed at a position moved by “−0.1 mm” from the reference position (a position where the shift amount in the horizontal axis of the graph is “−0.1”), one of the flare light Department passes. Therefore, in order to block only the flare light without blocking the imaging light, it is necessary to set the arrangement position of the flare light restricting portion 413 with high accuracy.

Therefore, in this embodiment, the flare light restricting aperture portion 413 in the optical structure 41 is preferably formed on the beam restricting aperture section 412 one body. Furthermore, the optical structure 41, a beam restricting aperture section 412 and the flare light restricting aperture section 413 and the reflection mirror array 411 is preferably formed on one body. In the present embodiment, beam restricting aperture section 412 and the flare light restricting aperture 413, as shown in FIGS. 2 and 3, the upper surface of the reflection mirror array 411, are formed in a body and the reflection mirror array 411. Reflection mirror array 411 by beam restricting aperture section 412 and the flare light restricting aperture section 413 is an optical structure 41 formed on one body, the optical system 4 which forms an optical image on the photoelectric conversion unit 5, the reflection The positional relationship among the mirror array 411, the light beam restriction diaphragm 412, and the flare light restriction diaphragm 413 can be maintained with high accuracy, and a temperature change occurs according to the usage of the image reading device 1. It is possible to suppress the occurrence of a difference in thermal expansion or thermal contraction between the three parties. Therefore, in the optical system 4 including the optical structure 41 including the reflection mirror array 411, the light beam restriction diaphragm 412, and the flare light restriction diaphragm 413, it is possible to suppress the deterioration of the imaging performance with respect to the photoelectric conversion unit 5.

  Further, in the image reading device 1 of the present embodiment, the reflection mirror array 411 of the optical structure 41 upsets the reflected light from the document 8 placed on the image reading area on the document placement surface 71 of the contact glass 7. It is desirable to be a telecentric optical system for imaging. Since the reflection mirror array 411 is a telecentric optical system, it is reflected by each of the first to sixth reflection areas 411a to 411f of the reflection mirror array 411, and the first to sixth flare light regulation passing of the flare light regulation diaphragm 413 is performed. A principal ray, which is light passing through the centers of the holes 413a to 413f and the first to sixth light beam regulation passage holes 412a to 412f of the light beam regulation diaphragm 412, is parallel to the optical axis (that is, the light receiving surface of the photoelectric conversion unit 5). Perpendicular to 51). Therefore, the first to sixth light receiving areas 51a on the light receiving surface 51 of the photoelectric conversion unit 5 are present even when there is an original position displacement portion such as a floating portion of the original 8 on the document mounting surface 71 of the contact glass 7. It is hard to produce a difference in the imaging magnification of the optical image imaged by each of -51f. As a result, the occurrence of image blurring due to image blurring can be suppressed in the read image, and the image reading device 1 can be made deep in the depth of field.

  Further, in the image reading device 1 of the present embodiment, each of the first to sixth reflection areas 411a to 411f in the reflection mirror array 411 of the optical structure 41 is an optical image formed of an inverted image reduced at a predetermined reduction ratio. It is desirable to be configured to form an image on each of the first to sixth light receiving areas 51 a to 51 f in the light receiving surface 51 of the photoelectric conversion unit 5. Then, as shown in FIGS. 2 and 4, on the light receiving surface 51 of the photoelectric conversion unit 5, the boundary portions of the respective light receiving regions of the first to sixth light receiving regions 51a to 51f and both end portions in the second direction. Preferably, a light shielding wall having a light shielding property is provided. Specifically, on the light receiving surface 51 of the photoelectric conversion unit 5, the first light shielding wall 52a is provided at one end in the second direction, and the second light receiving region 51a and the second light receiving region 51b are secondly separated. A light shielding wall 52b is provided, a third light shielding wall 52c is provided at the boundary between the second light receiving area 51b and the third light receiving area 51c, and a fourth at the boundary between the third light receiving area 51c and the fourth light receiving area 51d. A light shielding wall 52d is provided, and a fifth light shielding wall 52e is provided at a boundary between the fourth light receiving region 51d and the fifth light receiving region 51e, and a sixth at a boundary between the fifth light receiving region 51e and the sixth light receiving region 51f. A light shielding wall 52f is provided, and a seventh light shielding wall 52g is provided at the other end opposite to the one end in the second direction.

  By providing the first to seventh light shielding walls 52a to 52g on the light receiving surface 51 of the photoelectric conversion unit 5, the light is reflected by each of the first to sixth reflection regions 411a to 411f of the reflection mirror array 411. A part of the light having passed through each of the first to sixth light flux regulating passage holes 412 a to 412 f of the light beam regulating stop portion 412 is transmitted to the first to sixth light flux regulating passage holes 412 a to the light receiving surface 51 of the photoelectric conversion unit 5. Incident light to the light receiving area adjacent to the light receiving area corresponding to each of 412 f can be suppressed. Therefore, the formation of a ghost image in the read image can be suppressed.

  Specifically, a part of the light that is reflected by the first reflection area 411a of the reflection mirror array 411 and passes through the first light flux regulation passage hole 412a of the light flux regulation stop section 412 of the first light shielding wall 52a is photoelectrically Advancing outward from the first light receiving area 51 a on the light receiving surface 51 of the conversion unit 5 is suppressed. The second light shielding wall 52 b is reflected by the first reflection area 411 a of the reflection mirror array 411, and a part of the light that has passed through the first light beam restriction passing hole 412 a of the light beam restriction diaphragm 412 is received by the photoelectric conversion unit 5. It prevents the second light receiving area 51 b adjacent to the first light receiving area 51 a in the surface 51 from being incident. The third light shielding wall 52 c is reflected by the second reflection area 411 b of the reflection mirror array 411, and part of the light that has passed through the second light flux regulation passage hole 412 b of the light flux regulation diaphragm 412 is received by the photoelectric conversion unit 5. Incident to the third light receiving area 51c adjacent to the second light receiving area 51b in the surface 51 is suppressed. The fourth light shielding wall 52 d is reflected by the third reflection region 411 c of the reflection mirror array 411, and part of the light that has passed through the third light beam restriction passing hole 412 c of the light beam restriction diaphragm 412 is received by the photoelectric conversion unit 5. Incident to the fourth light receiving area 51 d adjacent to the third light receiving area 51 c in the surface 51 is suppressed. The fifth light shielding wall 52 e is reflected by the fourth reflection area 411 d of the reflection mirror array 411, and part of the light that has passed through the fourth luminous flux restriction passing hole 412 d of the luminous flux restriction diaphragm 412 is received by the photoelectric conversion part 5. The light is prevented from being incident on the fifth light receiving region 51e adjacent to the fourth light receiving region 51d in the surface 51. The sixth light shielding wall 52 f is reflected by the fifth reflection area 411 e of the reflection mirror array 411, and a part of the light that has passed through the fifth light flux regulation passage hole 412 e of the light flux regulation diaphragm 412 is received by the photoelectric conversion unit 5. Incident to the sixth light receiving region 51 f adjacent to the fifth light receiving region 51 e in the surface 51 is suppressed. The seventh light shielding wall 52 g is reflected by the sixth reflection region 411 f of the reflection mirror array 411, and part of the light that has passed through the sixth light beam restriction passing hole 412 f of the light beam restriction diaphragm 412 is received by the photoelectric conversion unit 5. Advancing outward from the sixth light receiving region 51 f in the surface 51 is suppressed.

  Further, as shown in FIG. 1, the image reading apparatus 1 of the present embodiment includes an image data generation unit 6. The image data generation unit 6 responds to the electrical signal from the photoelectric conversion unit 5 based on each of the optical images formed on each of the first to sixth light reception areas 51a to 51f in the light reception surface 51 of the photoelectric conversion unit 5. Image data corresponding to the image recorded on the document 8 is generated. In the present embodiment, the image data generation unit 6 is a processing unit that performs processing on each of the optical images formed on each of the first to sixth light receiving areas 51 a to 51 f on the light receiving surface 51 of the photoelectric conversion unit 5. , An enlargement processing unit, an inversion processing unit, and a combining processing unit. In the image data generation unit 6, the enlargement processing unit sets the reciprocal of the reduction ratio set in the optical image formed on each of the first to sixth light receiving areas 51 a to 51 f on the light receiving surface 51 of the photoelectric conversion unit 5. Perform enlargement processing with In the image data generation unit 6, the reversal processing unit reverses an inverted image to be an optical image formed on each of the first to sixth light receiving areas 51 a to 51 f on the light receiving surface 51 of the photoelectric conversion unit 5. Do the process you want. In the image data generation unit 6, the combination processing unit combines the images processed by the enlargement processing unit and the reversal processing unit and generates image data corresponding to the image recorded on the document 8.

  In the image data generation unit 6, for each of the optical images formed in each of the first to sixth light receiving areas 51a to 51f of the photoelectric conversion unit 5, the enlargement processing unit enlarges by an enlargement ratio that is the inverse of the reduction ratio. The inversion processor inverts the inverted image into an erect image, and the combination processor combines the enlarged and inverted images. Image data corresponding to the image recorded on the document 8 can be generated by each process in the image data generation unit 6 as described above.

  The image reading apparatus 1 according to the embodiment of the present invention has been described above, but the present invention is not limited to this, and for example, the following modified embodiments can be adopted.

  In the embodiment described above, the carriage 2 in which the light irradiation unit 3, the optical system 4, and the photoelectric conversion unit 5 are accommodated with respect to the document 8 placed in the image reading area on the document placement surface 71 of the contact glass 7. Has been described with reference to the configuration of the image reading apparatus 1 that reads an image based on the reflected light from the document 8 by moving the document reading apparatus 1 in the first direction (sub scanning direction). The present invention is not limited to such a configuration. For example, the reflected light from the original 8 which conveys the original 8 in the first direction (sub scanning direction) and passes through the image reading area (original reading position) Based on the above, an image reading apparatus (hereinafter referred to as “image reading apparatus 1A”) configured to read an image by the light irradiation unit 3, the optical system 4 and the photoelectric conversion unit 5 may be used.

  The image reading apparatus 1A having such a configuration does not include the contact glass 7 described above, and includes a transport mechanism that transports the document 8 in the first direction. The image reading apparatus 1A includes a storage case fixedly disposed instead of the carriage 2 movable in the first direction, and the light irradiation unit 3, the optical system 4 and the photoelectric conversion unit are included in the storage case. 5 are arranged.

  In the image reading apparatus 1A, the light emitting unit 3 applies light to the document 8 which is conveyed in the first direction by the conveyance mechanism and passes through the image reading area. Then, the optical system 4 forms an image on the photoelectric conversion unit 5 with the reflected light from the document 8 irradiated with light by the light irradiation unit 3 and the photoelectric conversion unit 5 converts the formed optical image into an electric signal. . Thus, the image of the document 8 can be read.

DESCRIPTION OF SYMBOLS 1 Image reading apparatus 2 Carriage 3 Light irradiation part 4 Optical system 41 Optical structure 411 Reflection mirror array (reflection mirror part)
411a first reflection area 411b second reflection area 411c third reflection area 411d fourth reflection area 411e fifth reflection area 411f sixth reflection area 412 light flux restricting diaphragm (second diaphragm)
412A luminous flux regulating light shielding portion (second light shielding portion)
412a first light flux regulation passage hole (third light passage hole)
412b Second light flux regulation passage hole (fourth light passage hole)
412c third light flux regulation passage hole 412d fourth light flux regulation passage hole 412e fifth light flux regulation passage hole 412f sixth light flux regulation passage hole 413 flare light regulation diaphragm (first diaphragm unit)
413A Flare light regulation light shielding part (first light shielding part)
413a 1st flare light regulation passage hole (1st light passage hole)
413b Second flare light regulation passage hole (second light passage hole)
413c third flare light regulation passage hole 413d fourth flare light regulation passage hole 413e fifth flare light regulation passage hole 413f sixth flare light regulation passage hole 5 photoelectric conversion portion 51 light receiving surface 51a first light reception region 51b second light reception region 51c Third light receiving region 51d fourth light receiving region 51e fifth light receiving region 51f sixth light receiving region 52a first light shielding wall 52b second light shielding wall 52c third light shielding wall 52d fourth light shielding wall 52e fifth light shielding wall 52f sixth light shielding wall 52g Seventh light shield wall 6 Image data generator 7 Contact glass 71 Original placement surface

Claims (6)

An image reading apparatus for reading an image based on reflected light from a document in a predetermined image reading area, comprising:
A light irradiator that irradiates light to a document in the image reading area;
An optical system for forming an image of reflected light from a document irradiated with light by the light irradiation unit;
A photoelectric conversion unit that converts an optical image formed by the optical system into an electrical signal;
The optical system is
A reflection mirror unit for reflecting light reflected from a document to the photoelectric conversion unit and forming an image on the photoelectric conversion unit, the reflection having a first reflection area and a second reflection area provided continuously in the main scanning direction Mirror part,
A first stop disposed on an imaging light path from the reflection mirror to the photoelectric conversion unit, the first stop being formed to penetrate the first light blocking portion having a light blocking property and the first light blocking portion; A first diaphragm unit having a first light passage hole and a second light passage hole for transmitting the light reflected by each of the first reflection region and the second reflection region;
It is a second diaphragm unit disposed between the first diaphragm unit and the photoelectric conversion unit on the imaging light path, and penetrates a second light shielding unit having a light shielding property and the second light shielding unit. And a second diaphragm unit having a third light passage hole and a fourth light passage hole for passing light passing through each of the first light passage hole and the second light passage hole. ,
The photoelectric conversion portion is a light receiving surface in which a first light receiving area and a second light receiving area for receiving light passing through each of the third light passing hole and the fourth light passing hole are provided along the main scanning direction. the a, Ri said first light receiving region and the line image sensor der each of said second light receiving region is converted into an electric signal to each of the optical image based on the received light,
The shape of each of the first light passing hole and the second light passing hole in the first stop portion is a rectangular shape,
The image reader according to claim 1 , wherein each of the third light passage hole and the fourth light passage hole in the second aperture section has a circular shape . In the image reading apparatus according to claim 1 ,
Wherein the first diaphragm portion and the second diaphragm portion, formed on one body, an image reading apparatus. In the image reading apparatus according to claim 2 ,
Wherein the first diaphragm portion and the said reflective mirror and the second diaphragm portion, formed on one body, an image reading apparatus. In the image reading apparatus according to claim 3 ,
The image reading apparatus, wherein the reflection mirror unit is a telecentric optical system that forms an inverted image of light reflected from a document. In the image reading apparatus according to claim 4 ,
Each of the first reflection area and the second reflection area in the reflection mirror portion is an optical image composed of an inverted image reduced at a predetermined reduction ratio, and the first light reception area and the second light reception in the light reception surface. Configured to be imaged in each of the regions,
The image reader according to claim 1, wherein a light shielding wall having a light shielding property is provided at a boundary portion between the first light receiving area and the second light receiving area on the light receiving surface. In the image reading apparatus according to claim 5 ,
Image data corresponding to an image recorded on a document is generated according to an electrical signal by the photoelectric conversion unit based on each of the optical image formed on each of the first light receiving area and the second light receiving area. Further comprising an image data generation unit;
The image data generation unit is a processing unit that performs processing on each of the optical images formed on each of the first light receiving area and the second light receiving area.
An enlargement processing unit that performs enlargement with an enlargement factor that is the reciprocal of the reduction factor;
A reverse processing unit that reverses the inverted image to form an erect image;
An image processing apparatus including: an enlargement processing unit; and a combination processing unit configured to combine the images processed by the inversion processing unit.

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