WO2015146470A1 - Image reading apparatus and image forming apparatus comprising same - Google Patents

Image reading apparatus and image forming apparatus comprising same Download PDF

Info

Publication number
WO2015146470A1
WO2015146470A1 PCT/JP2015/055692 JP2015055692W WO2015146470A1 WO 2015146470 A1 WO2015146470 A1 WO 2015146470A1 JP 2015055692 W JP2015055692 W JP 2015055692W WO 2015146470 A1 WO2015146470 A1 WO 2015146470A1
Authority
WO
WIPO (PCT)
Prior art keywords
light
organic
image
scanning direction
reading apparatus
Prior art date
Application number
PCT/JP2015/055692
Other languages
French (fr)
Japanese (ja)
Inventor
佳彦 黒津
Original Assignee
京セラドキュメントソリューションズ株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 京セラドキュメントソリューションズ株式会社 filed Critical 京セラドキュメントソリューションズ株式会社
Publication of WO2015146470A1 publication Critical patent/WO2015146470A1/en

Links

Images

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
    • H04N1/024—Details of scanning heads ; Means for illuminating the original
    • H04N1/028—Details of scanning heads ; Means for illuminating the original for picture information pick-up
    • H04N1/02815—Means for illuminating the original, not specific to a particular type of pick-up head
    • H04N1/02845—Means for illuminating the original, not specific to a particular type of pick-up head using an elongated light source, e.g. tubular lamp, LED array
    • H04N1/02865—Means for illuminating the original, not specific to a particular type of pick-up head using an elongated light source, e.g. tubular lamp, LED array using an array of light sources or a combination of such arrays, e.g. an LED bar

Definitions

  • the present invention relates to an image reading apparatus that optically reads an image of a document, and an image forming apparatus including the image reading apparatus.
  • an illumination unit using an LED (Light Emitting Diode) instead of a xenon lamp or the like has begun to be adopted as a light source of an image reading apparatus that optically reads an image of a document.
  • an illumination unit a type in which a large number of LED chips are arranged in the main scanning direction and a type using a high-intensity LED module and a light guide are known.
  • an LED module is disposed at an end in the main scanning direction, illumination light is incident on one end of the light guide, and the illumination light is emitted from the peripheral surface of the light guide (see, for example, Patent Document 1). ).
  • This configuration has the advantage that the light source itself is simple and low in cost.
  • the high-intensity LED module generates heat appropriately with light emission, it is necessary to arrange a heat dissipation mechanism such as a heat sink on the LED mounting board.
  • the light guide that guides the illumination light from one end to the other in the main scanning direction requires extremely fine processing in order to make the amount of illumination light constant in the main scanning direction.
  • the light guide body thermally expands due to the heat generated by the LED module, a structural measure to avoid warping of the light guide body based on the thermal expansion is also required. These complicate the structure of the lighting unit and increase the cost.
  • An object of the present invention is to provide an image reading apparatus having an illumination unit having a structure as simple as possible, and an image forming apparatus including the image reading apparatus.
  • An image reading apparatus is an image reading apparatus that reads an image of a document, an image sensor that converts light into an electrical signal, and a document reading surface on which the document is placed or passed.
  • An illumination unit that is disposed below the document reading surface and irradiates illumination light on the document on the document reading surface; and an optical system that forms an image of reflected light from the document on the image sensor,
  • the illumination unit has a light emitting surface that emits the illumination light and a back surface opposite to the light emitting surface, and has a flat organic EL light emitter that is long in the main scanning direction of the document and a mounting surface that faces the document reading surface. And a frame member that holds the organic EL light emitter along the back surface along the mounting surface.
  • An image forming apparatus includes the above image reading apparatus and an image forming unit that forms an image on a sheet based on image data output from the image reading apparatus.
  • the illumination system of the image reading apparatus can be constructed with a simple configuration in which the organic EL light emitter is disposed along the attachment surface facing the document reading surface. it can.
  • the organic EL illuminator itself emits surface light and hardly generates heat due to light emission, so that it is not necessary to apply a heat sink or a light guide. Therefore, according to the present invention, it is possible to provide an image reading apparatus having an illumination unit with a simple structure, and an image forming apparatus including the image reading apparatus.
  • FIG. 1 is a cross-sectional view illustrating a schematic configuration of an image reading apparatus and an image forming apparatus according to an embodiment of the present invention.
  • FIG. 2 is a perspective view showing an illumination unit according to an embodiment of the present invention.
  • FIG. 3 is a partially enlarged perspective view of the illumination unit.
  • 4 is a cross-sectional view taken along line IV-IV in FIG.
  • FIG. 5A is a plan view showing an example of a light emitting surface shape of an organic EL light emitter.
  • FIG. 5B is a graph showing a light amount distribution after passing through the imaging lens.
  • FIG. 5C is a graph showing a preferable light amount distribution of the light source.
  • FIG. 5A is a plan view showing an example of a light emitting surface shape of an organic EL light emitter.
  • FIG. 5B is a graph showing a light amount distribution after passing through the imaging lens.
  • FIG. 5C is a graph showing a preferable light amount distribution of the light source.
  • FIG. 6A is a plan view showing an example of a light emitting surface shape of an organic EL light emitter applicable to the present invention.
  • FIG. 6B is a plan view showing another example of the light emitting surface shape.
  • FIG. 6C is a plan view showing another example of the light emitting surface shape.
  • FIG. 6D is a plan view showing another example of the light emitting surface shape.
  • FIG. 6E is a plan view showing another example of the light emitting surface shape.
  • FIG. 7 is a plan view showing an organic EL light emitter provided with a cover member.
  • FIG. 8A is a plan view showing an organic EL light emitter held by a claw member.
  • 8B is a cross-sectional view taken along line VIIIB-VIIIB in FIG. 8A.
  • FIG. 9A is a cross-sectional view showing an embodiment including an attachment surface having a concave shape in the sub-scanning direction.
  • FIG. 9B is a cross-sectional view showing an embodiment including an attachment surface having a concave shape in the sub-scanning direction.
  • FIG. 10A is a cross-sectional view showing an embodiment including an attachment surface having a concave shape in the main scanning direction.
  • FIG. 10B is a cross-sectional view showing an embodiment including an attachment surface having a concave shape in the main scanning direction. It is a schematic diagram which shows the modification of an illumination unit.
  • FIG. 1 is a cross-sectional view showing a schematic configuration of an image forming apparatus 1 according to an embodiment of the present invention.
  • an in-body discharge type monochrome copying machine including a scanner device 13 (image reading device) is illustrated as the image forming apparatus 1.
  • the apparatus to which the present invention is applied is not limited to the present embodiment, and may be, for example, a color copying machine, a scanner apparatus, a facsimile apparatus, or a multifunction apparatus.
  • the image forming apparatus 1 includes a substantially rectangular parallelepiped main body housing 10 and an automatic document feeder 11 disposed on the upper surface of the main body housing 10.
  • the main body housing 10 is a housing that houses various devices that perform image forming processing on sheets.
  • the automatic document feeder 11 automatically conveys a document sheet to be copied via an image reading position set on the upper surface of the main body housing 10 (upper surface of the second contact glass 132).
  • a document sheet conveying device 12 is incorporated in the left side of the automatic document feeder 11.
  • a scanner device 13 for optically reading an image of a document sheet is accommodated in the upper part of the main body housing 10.
  • the scanner device 13 will be described in detail later.
  • an in-body sheet discharge unit 14 that can store a sheet after image formation is provided below the scanner device 13.
  • a paper feed cassette 15 that accommodates a sheet on which image forming processing is performed is detachably attached to the lower portion of the main body housing 10.
  • a manual feed tray 16 is attached to the right side wall of the main body housing 10.
  • the main body housing 10 includes a first discharge port 141 and a second discharge port 142 that open toward the space of the in-body discharge unit 14.
  • a sheet discharged from the first discharge port 141 is received by the in-body discharge tray 143.
  • a sub discharge tray 144 is mounted above the in-body discharge tray 143.
  • a sheet discharged from the second discharge port 142 is stacked on the sub discharge tray 144, or a sheet to be printed on both sides is temporarily discharged for switchback conveyance.
  • an image forming unit 20 In the main body housing 10, in addition to the scanner device 13 and the paper feed cassette 15 described above, an image forming unit 20, a fixing unit 30, and a sheet conveyance path are accommodated.
  • the image forming unit 20 forms an image on a sheet based on the image data output from the scanner device 13.
  • the image forming unit 20 includes a photosensitive drum 21, and a charger 22, an exposure device 23, a developing device 24, a transfer roller 25, and a cleaning device 26 disposed around the photosensitive drum 21.
  • the photosensitive drum 21 rotates around its axis and includes a peripheral surface on which an electrostatic latent image and a toner image are formed.
  • the charger 22 uniformly charges the peripheral surface of the photosensitive drum 21.
  • the exposure device 23 irradiates the peripheral surface of the photosensitive drum 21 with laser light in order to form an electrostatic latent image.
  • the developing device 24 supplies toner to the peripheral surface of the photosensitive drum 21 in order to develop the electrostatic latent image formed on the photosensitive drum 21.
  • the transfer roller 25 forms a transfer nip portion with the photosensitive drum 21 and transfers the toner image on the photosensitive drum 21 to a sheet.
  • the cleaning device 26 cleans the peripheral surface of the photosensitive drum 21 after the toner image is transferred.
  • a toner container 27 for supplying toner to the developing device 24 is disposed adjacent to the developing device 24.
  • the fixing unit 30 includes a fixing roller 31 with a built-in heat source, and a pressure roller 32 that forms a fixing nip portion together with the fixing roller 31.
  • the fixing unit 30 performs a fixing process by heating and pressurizing the sheet on which the toner image is transferred in the transfer nip portion in the fixing nip portion.
  • the fixed sheet is discharged from the first discharge port 141 or the second discharge port 142 toward the in-body discharge unit 14.
  • the sheet conveyance path includes a main conveyance path P1 extending in the vertical direction from the vicinity of the lower part of the main body housing 10 to the vicinity of the upper part via the image forming unit 20 and the fixing unit 30. Near the downstream end of the main transport path P1, a first discharge transport path P2 that leads the sheet to the first discharge port 141 is branched. A second discharge conveyance path P3 that guides the sheet to the second discharge port 142 is connected to the most downstream end (upper end) of the main conveyance path P1. Further, a reverse conveyance path P4 that reverses and conveys the sheet during duplex printing extends from the most downstream end of the main conveyance path P1 to the vicinity of the upstream end.
  • the paper feed cassette 15 includes a sheet storage unit 151 that stores a sheet bundle.
  • a pickup roller 152 that feeds out the uppermost sheet of the sheet bundle one by one and a paper feed roller pair 153 that feeds the sheet to the upstream end of the main transport path P1 are provided near the upper right of the sheet storage unit 151. Yes.
  • the sheet placed on the manual feed tray 16 is sent out to the upstream end of the main transport path P1 by the manual feed roller 161.
  • a registration roller pair 154 that feeds the sheet to the transfer nip portion at a predetermined timing is disposed upstream of the image forming unit 20 in the main conveyance path P1.
  • the sheet When a single-sided printing process is performed on a sheet, the sheet is sent out from the sheet storage unit 151 or the manual feed tray 16 to the main conveyance path P1, and the transfer process of the toner image is transferred to the sheet in the image forming unit 20 in the fixing unit 30. A fixing process for fixing the toner to the sheet is performed. Thereafter, the sheet is discharged from the first discharge port 141 onto the in-body discharge tray 143 through the first discharge conveyance path P2. On the other hand, when the double-sided printing process is performed on the sheet, after the transfer process and the fixing process are performed on one side of the sheet, the sheet passes through the second discharge conveyance path P3 and is then discharged from the second discharge port 142 to the sub discharge. A part is discharged onto the paper tray 144.
  • the sheet is conveyed in a switchback manner, and returned to the vicinity of the upstream end of the main conveyance path P1 through the reverse conveyance path P4. Thereafter, a transfer process and a fixing process are performed on the other surface of the sheet, and the sheet is discharged from the first discharge port 141 onto the in-body discharge tray 143 through the first discharge conveyance path P2. .
  • the scanner device 13 includes a scanner housing 130, and a first contact glass 131 for manual reading and a second contact glass 132 for automatic reading that are fitted on the upper surface of the scanner housing 130.
  • the upper surface of the first contact glass 131 serves as a document reading surface of a document sheet placed by the user.
  • the upper surface of the second contact glass 132 serves as a document reading surface through which a document sheet automatically fed from the automatic document feeder 11 passes.
  • the scanner device 13 includes an illumination unit 5, a mirror unit 73, a condenser lens unit 8 (optical system), and an image sensor 9 housed in a scanner housing 130.
  • the illumination unit 5 irradiates the original sheet on the original reading surface with illumination light.
  • the illumination unit 5 includes an organic EL light emitter 6 as a light source that emits the illumination light toward the document reading position, a reflector 71 that directs the illumination light toward the document reading position, and a document irradiated with the illumination light.
  • a first reflection mirror 72 that reflects light reflected from the sheet is mounted.
  • the mirror unit 73 is equipped with a second reflecting mirror 731 and a third reflecting mirror 732 in order to reverse the optical path of the reflected light.
  • the illumination unit 5 reciprocates in the left-right direction (sub-scanning direction) along the lower surfaces of the first and second contact glasses 131 and 132 (below the document reading surface).
  • the mirror unit 73 reciprocates in the left-right direction with a movement amount 1 ⁇ 2 that of the illumination unit 5.
  • the illumination unit 5 moves immediately below the second contact glass 132 and becomes stationary. In this stationary state, illumination light is emitted from the organic EL light emitter 6 toward the document sheet.
  • the illumination unit 5 moves to the right according to the size of the document sheet from directly below the left end of the first contact glass 131. During this movement, illumination light is emitted from the organic EL light emitter 6 toward the document sheet.
  • the mirror unit 73 follows the lighting unit 5 and moves to the right by a movement amount that is 1 ⁇ 2 of that of the lighting unit 5.
  • the organic EL light emitter 6 irradiates the original sheet with linear illumination light that is long in the main scanning direction.
  • the organic EL light emitter 6 is disposed to face the first and second contact glasses 131 and 132 with a predetermined angle.
  • the normal line of the light emitting surface of the organic EL light emitter 6 substantially intersects the original reading position so that the illumination light emitted from the organic EL light emitter 6 is oriented to the original reading position.
  • the reflection plate 71 is disposed substantially symmetrically with the organic EL light emitter 6 with a vertical plane including the image reading position interposed therebetween. Part of the diffused light of the illumination light is reflected by the reflecting plate 71 and travels toward the document reading position.
  • the first reflecting mirror 72 reflects the reflected light of the illumination light emitted from the organic EL light emitter 6 toward the document sheet so as to be directed toward the second reflecting mirror 731 of the mirror unit 73.
  • the second reflection mirror 731 reflects the reflected light reflected toward the left by the first reflection mirror 72 toward the third reflection mirror 732.
  • the third reflection mirror 732 reflects the reflected light to the right so as to go to the condenser lens unit 8.
  • the condensing lens unit 8 forms an optical image of the reflected light reflected by the third reflecting mirror 732 on the imaging surface of the imaging element 9.
  • the image sensor 9 is composed of a CCD (charge coupled device) or the like, and receives the reflected light and photoelectrically converts it into an analog electric signal.
  • the analog electrical signal is converted into a digital electrical signal by an A / D conversion circuit (not shown), and then input to the exposure device 23 as image data.
  • FIG. 2 is a perspective view of the illumination unit 5
  • FIG. 3 is an enlarged perspective view of the end of the illumination unit 5 in the main scanning direction
  • FIG. 4 is a sectional view taken along line IV-IV in FIG.
  • the illumination unit 5 includes the organic EL light emitter 6 and the reflection plate 71 (reflector) described above, and a frame member 50 that holds them.
  • An organic EL (Electro-Luminescence) light emitter 6 includes a thin light-emitting layer made of an organic compound, and an anode and a cathode disposed with the light-emitting layer sandwiched therebetween, and has a flat plate shape that is long in the main scanning direction of the original sheet. It is a light emitting body for illumination having flexibility.
  • the organic EL light emitter 6 includes a light emitting surface 6F that emits illumination light and a back surface 6B opposite to the light emitting surface 6F, and is held by the frame member 50 so that the light emitting surface 6F faces the document reading position RA of the document reading surface R. ing.
  • the reflection plate 71 is an elongated flat plate member having a mirror surface that reflects illumination light and having substantially the same length as the organic EL light emitter 6 in the main scanning direction.
  • the reflecting plate 71 is held by the frame member 50 so that the normal line of the reflecting plate 71 is generally directed to the document reading position RA.
  • the frame member 50 is made of a sheet metal working member, and has a horizontal plate 501 that is long in the front-rear direction (main scanning direction), a first holding unit 51 and a second holding unit 52 that are erected upward from the horizontal plate 501, And a slit 53 that is long in the front-rear direction and is perforated in the plate 501.
  • Engaging portions 502 formed of bent portions are provided at both ends of the horizontal plate 501 in the main scanning direction. To the engaging portion 502, pulleys for smoothly moving the frame member 50 (illumination unit 5) in the sub-scanning direction are attached.
  • the first holding unit 51 is provided to hold the organic EL light emitter 6.
  • the first holding portion 51 is a frame frame disposed on the right side of the horizontal plate 501, and forms a first inclined surface that forms an attachment surface 54 ⁇ / b> S for holding the organic EL light emitter 6.
  • a portion 54 is provided.
  • the attachment surface 54S is a plane inclined substantially 45 degrees with respect to the horizontal plane in the sub-scanning section, and faces the document reading surface R (document reading position RA).
  • the organic EL light emitter 6 is attached to the first inclined surface portion 54 so that the back surface 6B thereof is along the attachment surface 54S.
  • a bonding member 54A is interposed between the back surface 6B and the attachment surface 54S, and the organic EL light emitter 6 is firmly held on the attachment surface 54S.
  • the joining member 54A is, for example, a double-sided tape or an organic adhesive layer.
  • the second holding part 52 is provided for holding the reflection plate 71.
  • the second holding portion 52 is a drawing processed portion disposed on the left side of the horizontal plate 501, and includes a second inclined surface portion 55 that forms a support surface 55 ⁇ / b> S (the other attachment surface) for holding the reflecting plate 71.
  • the support surface 55S is a plane that is inclined at approximately 45 degrees with respect to the horizontal plane in the sub-scan section, and faces the document reading surface R (document reading position RA).
  • the support surface 55S is substantially at a height position with respect to the attachment surface 54S, and the inclination directions are opposite to each other.
  • the horizontal plate 501, the support surface 55 ⁇ / b> S, and the attachment surface 54 ⁇ / b> S form a generally mortar-shaped recess.
  • the reflection plate 71 is held by the second inclined surface portion 55 with the back surface thereof being in close contact with the support surface 55S.
  • the slit portion 53 is a slit for guiding reflected light from the original sheet to the lower side of the horizontal plate 501.
  • FIG. 4 shows the optical paths of the illumination lights L1 and L2 and the reflected light L3.
  • the illumination light L1 emitted from the light emitting surface 6F of the organic EL light emitter 6 goes to the document reading position RA.
  • the diffuse illumination light L2 emitted from the light emitting surface 6F is reflected by the reflecting plate 71 and travels toward the document reading position RA.
  • These illumination lights L1 and L2 are reflected by the original sheet placed or passed at the original reading position RA, and become reflected light L3 and travel vertically downward.
  • the reflected light L3 passes through the slit portion 53 and is reflected by a first reflecting mirror 72 (not shown in FIG. 4).
  • the organic EL light emitter 6 includes a central portion 61 having a relatively narrow width of the light emitting surface 6F and a pair of end portions 62 having a relatively wide width of the light emitting surface 6F. That is, the area per unit length in the main scanning direction of the light emitting surface 6F is set to be larger at the end 62 than at the central portion 61 in the main scanning direction. As a result, the end 62 has a larger light emitting surface 6F, and the amount of emitted light is greater at the end 62 than at the center 61.
  • the significance of such a configuration will be described.
  • FIG. 5A is a plan view showing the shape of the light emitting surface 6F of the organic EL light emitting body 601 applicable to the present invention.
  • the organic EL light emitter 601 includes a rectangular light emitting surface 6F having a uniform width over the entire length in the main scanning direction. In this case, the amount of light emitted from the light emitting surface is substantially uniform from the end to the center in the main scanning direction.
  • the organic EL light emitter 6 having the wide end 62 is used. Is desirable.
  • FIG. 5B is a graph showing a light amount distribution after passing through the condenser lens unit 8 when the organic EL light-emitting body 601 is used as a light source.
  • the light quantity at the end in the main scanning direction tends to decrease due to the characteristics of the lens. This is because less light passes through the lens near the + end and ⁇ end of the scanning width in the main scanning direction. Therefore, even if the light source itself emits illumination light with a uniform light amount over the entire length of the scanning width, when the reflected light passes through the condenser lens unit 8, the light amounts near the + end and ⁇ end are centered. It will be lower than the vicinity. When such light enters the image sensor 9, there is a concern that the exposure of the end portion in the main scanning direction becomes insufficient.
  • FIG. 5C is a graph showing a preferable light amount distribution as a light source of the illumination unit 5.
  • This graph has a light amount distribution in which the light amount near the + end and ⁇ end in the main scanning direction is higher than that near the center. If the light source has such a light amount distribution, it is possible to compensate for the decrease in the light amount at the end when the condenser lens unit 8 passes. Accordingly, the amount of light incident on the image sensor 9 can be made uniform over the entire length in the main scanning direction.
  • an organic EL light emitter is used as a light source.
  • An organic EL light emitter generally emitting uniform light per unit area, the amount of light emission depends on the area of the light emitting surface. Therefore, in the light amount distribution as shown in FIG. 5C, by adjusting the area of the light emitting surface, specifically, the area of the light emitting surface near the + end and ⁇ end in the main scanning direction is made larger than that near the center. Therefore, it can be easily obtained.
  • FIG. 6A to 6E are plan views showing various examples of the light emitting surface shape of the organic EL light emitter that can obtain the light quantity distribution as shown in FIG. 5C.
  • FIG. 6A shows the planar shape of the light emitting surface 6F of the organic EL light emitter 6 illustrated in FIGS.
  • the organic EL light emitter 6 can compensate for the light amount decrease at the end when the condenser lens unit 8 passes through the central portion 61 having a width (standard width) that can emit a light amount necessary for exposure.
  • the area per unit length in the main scanning direction is larger at the end portion 62 than at the central portion 61.
  • the taper portion 621 the area per unit length increases with increasing toward the + or ⁇ off-axis direction in the main scanning direction.
  • the organic EL illuminator 602 does not have the tapered portion 621 as in the organic EL illuminator 6 described above, and the boundary between the central portion 61A and the end portion 62A has a step based on the difference in width. ing.
  • the organic EL light emitter 603 of FIG. 6C includes a central portion 61B having the standard width, and an end portion 62B whose area per unit length increases toward the + or ⁇ off-axis direction in the main scanning direction. It has.
  • the end portion 62B has a trapezoidal shape, and the upper base is the same width as the central portion 61B, and the lower base is wider than the central portion 61B.
  • FIG. 6D shows the organic EL light-emitting body 604 in a state in which the central portion and the end portion are not integrated, but are separated.
  • the organic EL light emitter 604 has a central portion 61C made of the first light emitter having the standard width and a pair of end portions 62C made of the second light emitter having the increased width.
  • FIG. 6E shows an organic EL light emitting body 605 using two kinds of light emitting bodies having different light emission amounts in a state where the central portion and the end portion are separated.
  • the organic EL light emitter 605 has the standard width and a central portion 61D made of a first light emitter that emits a light beam having a predetermined first light emission amount, the standard width, and the first width. And a pair of end portions 62D made of a second light emitter that emits a light beam having a second light emission amount larger than the light emission amount. According to the organic EL light emitter 605, it is possible to obtain a light amount distribution in which the light emission amount at the end portion is increased while the width of the light emitting surface is the same at the end portion and the central portion.
  • a light amount distribution as shown in FIG. 5C may be obtained by covering part of the light emitting surface of the organic EL light emitter.
  • the organic EL light emitter 606 shown in FIG. 7 includes a cover member 63 that covers a part of the light emitting surface.
  • the light emitting surface of the organic EL light emitter 606 has a rectangular shape that is long in the main scanning direction, and the width thereof is longer than the standard width.
  • the cover member 63 covers the vicinity of both sides of the light emitting surface in the main scanning direction (near the edges of the two long sides) except for the vicinity of the end in the main scanning direction.
  • the cover member 63 a light shielding tape or film, a light shielding paint, a light shielding plate, or the like can be used. By covering a part of the light emitting surface with the cover member 63, the central portion 61E having the standard width and the pair of end portions 62E having the increased width can be formed. With such an organic EL light emitter 606, a light emitting area difference can be provided between the central portion and the end portion in the main scanning direction of the light emitting surface while using a simple rectangular organic EL light emitter. .
  • the cover member 63 as described above also serves as a claw member for holding the organic EL light emitter 607 on the frame member 50.
  • 8A is a plan view showing the organic EL light emitter 607 held by the claw member 541 (holding member), and FIG. 8B is a sectional view taken along line VIIIB-VIIIB in FIG. 8A.
  • a claw member 541 made of a hook-shaped protrusion is provided on the first inclined surface portion 54 ⁇ / b> A provided in the first holding portion 51 of the frame member 50.
  • the claw members 541 are erected in pairs on the attachment surface 54AS of the first slope portion 54A with an interval corresponding to the width of the organic EL light emitter 607.
  • the pair of claw members 541 covers the vicinity of both sides in the sub-scanning direction of the light emitting surface of the organic EL light emitting body 607 except for the vicinity of the end in the main scanning direction, and holds the organic EL light emitting body 607 at the portion. is doing. By covering a part of the light emitting surface with the claw member 541, a central portion 61F having the standard width and a pair of end portions 62F having the increased width are formed. According to this embodiment, since the claw member 541 also serves as the cover member when the light emitting surface has the light emitting area difference, the number of parts can be reduced.
  • FIG. 9A illustrates a preferred embodiment that takes advantage of this merit.
  • the organic EL light emitter 608 is attached to the first inclined surface portion 54B having an attachment surface in a curved state in the cross section in the sub-scanning direction.
  • the first inclined surface portion 54B is an arc surface having a concave shape toward the document reading surface R in the cross section in the sub-scanning direction.
  • the organic EL light emitter 608 is attached to the attachment surface of the first slope portion 54B along the concave shape. According to this embodiment, the organic EL light emitter 608 is held by the frame member 50 in a form having a concave shape toward the document reading surface R in the cross section in the sub-scanning direction. Therefore, the illumination light emitted from the organic EL light emitter 608 can be condensed toward the document reading position RA that is a target point. This contributes to increasing the amount of illumination light at the document reading position RA.
  • FIG. 9B is illustrated as another embodiment for providing a light collecting effect.
  • the first slope portion 54C having a concave surface formed by bending is used in the cross section in the sub-scanning direction.
  • the first inclined surface portion 54C is formed by bending the flat plate member at two locations along a bending line extending in the main scanning direction, and has three inclined surface portions 54C1, 54C2, and 54C3 having different inclination angles with respect to the document reading surface R. .
  • the organic EL light emitters 609, 610, and 611 are attached with the surfaces of the slope portions 54C1, 54C2, and 54C3 as attachment surfaces. Also in such an aspect, the illumination light emitted from the three organic EL light emitters 609, 610, and 611 can be concentrated toward the document reading position RA.
  • FIG. 10A and FIG. 10B are cross-sectional views showing an embodiment including an attachment surface having a concave shape in the main scanning direction. These embodiments are also embodiments capable of obtaining a preferable light amount distribution shown in FIG. 5C.
  • the first inclined surface portion 54D having a mounting surface includes a central flat portion 54D1, an end flat portion 54D2, and a curved portion 54D3 between them.
  • the attachment surface of the first inclined surface portion 54D has a distance to the document reading surface R.
  • the central flat portion 54D1 is a predetermined distance d1
  • the end flat portion 54D2 is a distance d2 shorter than the distance d1. It is. That is, the attachment surface is a surface having a concave shape with a distance from the document reading surface R that is shorter at the end than at the center in the main scanning direction.
  • the organic EL light emitter 612 is attached to the attachment surface of the first slope portion 54D along the concave shape.
  • the light amount at the end is increased by the amount closer to the document reading surface R at the end than at the center. be able to. Therefore, it is possible to create a desirable light amount distribution without making the light emitting area different between the end portion and the central portion.
  • the first inclined surface portion 54E having the attachment surface includes a central flat portion 54E1 and end inclined portions 54E2 extending from both ends of the central flat portion 54E1.
  • the attachment surface of the first slope portion 54E has a constant distance to the document reading surface R at a predetermined distance d1 in the central flat portion 54E1.
  • the distance from the distance d21 to the distance d22 is gradually shortened toward the off-axis.
  • the organic EL light emitter 613 is attached to the attachment surface having such a concave shape. Even in this embodiment, similarly, in the light amount distribution of the illumination light, the end portion can be made larger than the center portion.
  • the present invention is not limited to the above embodiments.
  • the attachment surface 54S of the first slope portion 54 and the support surface 55S (attachment surface) of the second slope portion 55 are provided in a pair in the sub-scanning direction across the reading position RA, and are attached to the attachment surface 54S.
  • a plurality of organic EL light emitters 6 may be arranged in the sub-scanning direction across the reading position RA.
  • FIG. 11 is a schematic diagram showing a modification of the lighting unit 5.
  • two first inclined surface portions 54 having attachment surfaces are arranged to face each other across the reading position RA in the sub-scanning direction.
  • the organic EL light emitter 6 is attached to each of these two attachment surfaces. According to this embodiment, the amount of illumination light can be increased.
  • the scanner device 13 (image reading device) according to the present invention, the scanner device has a simple configuration in which the organic EL light emitter 6 is disposed along the attachment surface 54S facing the document reading surface R. Thirteen illumination systems can be constructed.
  • the organic EL light-emitting body 6 has an advantage that it itself emits surface light and hardly generates heat due to light emission, so that it is not necessary to apply a heat sink or a light guide.

Abstract

An image reading apparatus (13), which reads the image of a source document, comprises: an image capture element (9) that converts a light to an electric signal; a source document reading plane (R) on which the source document is put or along which the source document passes; an illumination unit (5) that is placed below the source document reading plane and that irradiates an illumination light onto the source document on the source document reading plane; and an optical system (8) that causes a reflected light from the source document to form an image on the image capture element. The illumination unit (5) includes: a planar organic EL light emitter (6) that is long in the main scan direction for the source document and that has a light emission plane (6F) for emitting the illumination light and a back plane (6B) opposite to the light emission plane; and a frame member (50) that has a mounting plane opposed to the source document reading plane and that supports the organic EL light emitter in such a manner that the back plane of the organic EL light emitter lies on the mounting plane of the frame member.

Description

画像読取装置、及びこれを備えた画像形成装置Image reading apparatus and image forming apparatus having the same
　本発明は、原稿の画像を光学的に読み取る画像読取装置、及びこれを備えた画像形成装置に関する。 The present invention relates to an image reading apparatus that optically reads an image of a document, and an image forming apparatus including the image reading apparatus.
　近年、原稿の画像を光学的に読み取る画像読取装置の光源として、キセノンランプ等に代えてＬＥＤ（Ｌｉｇｈｔ　Ｅｍｉｔｔｉｎｇ　Ｄｉｏｄｅ）を用いた照明ユニットが採用されはじめている。このような照明ユニットとして、多数のＬＥＤチップを主走査方向に配列したタイプ、高輝度ＬＥＤモジュールと導光体とを用いたタイプとが知られている。後者のタイプでは、ＬＥＤモジュールを主走査方向の端部に配置し、照明光を導光体の一端に入射させ、該導光体の周面から前記照明光を出射させる（例えば特許文献１参照）。この構成は、光源自体はシンプルであり、低コストであるという利点がある。 In recent years, an illumination unit using an LED (Light Emitting Diode) instead of a xenon lamp or the like has begun to be adopted as a light source of an image reading apparatus that optically reads an image of a document. As such an illumination unit, a type in which a large number of LED chips are arranged in the main scanning direction and a type using a high-intensity LED module and a light guide are known. In the latter type, an LED module is disposed at an end in the main scanning direction, illumination light is incident on one end of the light guide, and the illumination light is emitted from the peripheral surface of the light guide (see, for example, Patent Document 1). ). This configuration has the advantage that the light source itself is simple and low in cost.
　しかし、高輝度ＬＥＤモジュールは発光と共に相応に発熱するため、ＬＥＤの搭載基板にヒートシンク等の放熱機構を配置する必要がある。また、照明光を主走査方向の一端から他端へ導く導光体は、照明光量を主走査方向に一定とするために極めて微細な加工を要する。さらに、導光体がＬＥＤモジュールの発熱の影響で熱膨張するため、該熱膨張に基づく導光体の反りを回避する構造的な対策も必要となる。これらは、照明ユニットの構造を複雑にすると共に、コストアップの要因となる。 However, since the high-intensity LED module generates heat appropriately with light emission, it is necessary to arrange a heat dissipation mechanism such as a heat sink on the LED mounting board. Further, the light guide that guides the illumination light from one end to the other in the main scanning direction requires extremely fine processing in order to make the amount of illumination light constant in the main scanning direction. Furthermore, since the light guide body thermally expands due to the heat generated by the LED module, a structural measure to avoid warping of the light guide body based on the thermal expansion is also required. These complicate the structure of the lighting unit and increase the cost.
特開２００８―２１６４０９号公報JP 2008-216409 A
　本発明の目的は、可及的に簡易な構造の照明ユニットを有する画像読取装置、及びこれを備えた画像形成装置を提供することにある。 An object of the present invention is to provide an image reading apparatus having an illumination unit having a structure as simple as possible, and an image forming apparatus including the image reading apparatus.
　本発明の一の局面に係る画像読取装置は、原稿の画像を読み取る画像読取装置であって、光を電気信号に変換する撮像素子と、前記原稿が載置される又は通過する原稿読取面と、前記原稿読取面の下方に配置され、前記原稿読取面上の原稿に照明光を照射する照明ユニットと、前記原稿からの反射光を前記撮像素子に結像させる光学系と、を備え、前記照明ユニットは、前記照明光を発する発光面と、その反対側の裏面とを有し、前記原稿の主走査方向に長い平板状の有機ＥＬ発光体と、前記原稿読取面に対向する取り付け面を備え、該取り付け面に前記裏面を沿わせて前記有機ＥＬ発光体を保持するフレーム部材と、を備える。 An image reading apparatus according to an aspect of the present invention is an image reading apparatus that reads an image of a document, an image sensor that converts light into an electrical signal, and a document reading surface on which the document is placed or passed. An illumination unit that is disposed below the document reading surface and irradiates illumination light on the document on the document reading surface; and an optical system that forms an image of reflected light from the document on the image sensor, The illumination unit has a light emitting surface that emits the illumination light and a back surface opposite to the light emitting surface, and has a flat organic EL light emitter that is long in the main scanning direction of the document and a mounting surface that faces the document reading surface. And a frame member that holds the organic EL light emitter along the back surface along the mounting surface.
　本発明の他の局面に係る画像形成装置は、上記の画像読取装置と、前記画像読取装置から出力される画像データに基づいて、シートに画像を形成する画像形成部と、を備える。 An image forming apparatus according to another aspect of the present invention includes the above image reading apparatus and an image forming unit that forms an image on a sheet based on image data output from the image reading apparatus.
　上記の画像読取装置若しくは画像形成装置によれば、原稿読取面に対向する取り付け面に沿わせて前記有機ＥＬ発光体を配置するという簡単な構成で、画像読取装置の照明系を構築することができる。有機ＥＬ発光体は、それ自身が面発光し、また発光に伴う発熱も殆ど無いので、ヒートシンクや導光体を適用する必要もない。従って、本発明によれば、簡易な構造の照明ユニットを有する画像読取装置、及びこれを備えた画像形成装置を提供することができる。 According to the image reading apparatus or the image forming apparatus, the illumination system of the image reading apparatus can be constructed with a simple configuration in which the organic EL light emitter is disposed along the attachment surface facing the document reading surface. it can. The organic EL illuminator itself emits surface light and hardly generates heat due to light emission, so that it is not necessary to apply a heat sink or a light guide. Therefore, according to the present invention, it is possible to provide an image reading apparatus having an illumination unit with a simple structure, and an image forming apparatus including the image reading apparatus.
　本発明の目的、特徴及び利点は、以下の詳細な説明と添付図面とによって、より明白となる。 The objects, features and advantages of the present invention will become more apparent from the following detailed description and the accompanying drawings.
図１は、本発明の一実施形態に係る画像読取装置及び画像形成装置の概略構成を示す断面図である。FIG. 1 is a cross-sectional view illustrating a schematic configuration of an image reading apparatus and an image forming apparatus according to an embodiment of the present invention. 図２は、本発明の一実施形態に係る照明ユニットを示す斜視図である。FIG. 2 is a perspective view showing an illumination unit according to an embodiment of the present invention. 図３は、前記照明ユニットの一部拡大斜視図である。FIG. 3 is a partially enlarged perspective view of the illumination unit. 図４は、図２のＩＶ－ＩＶ線断面図である。4 is a cross-sectional view taken along line IV-IV in FIG. 図５Ａは、有機ＥＬ発光体の発光面形状の一例を示す平面図である。FIG. 5A is a plan view showing an example of a light emitting surface shape of an organic EL light emitter. 図５Ｂは、結像レンズ通過後の光量分布を示すグラフである。FIG. 5B is a graph showing a light amount distribution after passing through the imaging lens. 図５Ｃは、光源の好ましい光量分布を示すグラフである。FIG. 5C is a graph showing a preferable light amount distribution of the light source. 図６Ａは、本発明に適用可能な、有機ＥＬ発光体の発光面形状の一例を示す平面図である。FIG. 6A is a plan view showing an example of a light emitting surface shape of an organic EL light emitter applicable to the present invention. 図６Ｂは、前記発光面形状の他の例を示す平面図である。FIG. 6B is a plan view showing another example of the light emitting surface shape. 図６Ｃは、前記発光面形状の他の例を示す平面図である。FIG. 6C is a plan view showing another example of the light emitting surface shape. 図６Ｄは、前記発光面形状の他の例を示す平面図である。FIG. 6D is a plan view showing another example of the light emitting surface shape. 図６Ｅは、前記発光面形状の他の例を示す平面図である。FIG. 6E is a plan view showing another example of the light emitting surface shape. 図７は、カバー部材を備えた有機ＥＬ発光体を示す平面図である。FIG. 7 is a plan view showing an organic EL light emitter provided with a cover member. 図８Ａは、爪部材で保持された有機ＥＬ発光体を示す平面図である。FIG. 8A is a plan view showing an organic EL light emitter held by a claw member. 図８Ｂは、図８ＡのＶＩＩＩＢ－ＶＩＩＩＢ線断面図である。8B is a cross-sectional view taken along line VIIIB-VIIIB in FIG. 8A. 図９Ａは、副走査方向に凹の形状を有する取り付け面を備える実施形態を示す断面図である。FIG. 9A is a cross-sectional view showing an embodiment including an attachment surface having a concave shape in the sub-scanning direction. 図９Ｂは、副走査方向に凹の形状を有する取り付け面を備える実施形態を示す断面図である。FIG. 9B is a cross-sectional view showing an embodiment including an attachment surface having a concave shape in the sub-scanning direction. 図１０Ａは、主走査方向に凹の形状を有する取り付け面を備える実施形態を示す断面図である。FIG. 10A is a cross-sectional view showing an embodiment including an attachment surface having a concave shape in the main scanning direction. 図１０Ｂは、主走査方向に凹の形状を有する取り付け面を備える実施形態を示す断面図である。FIG. 10B is a cross-sectional view showing an embodiment including an attachment surface having a concave shape in the main scanning direction. 照明ユニットの変形例を示す模式図である。It is a schematic diagram which shows the modification of an illumination unit.
　以下、図面に基づいて、本発明の実施形態につき詳細に説明する。図１は、本発明の一実施形態に係る画像形成装置１の概略構成を示す断面図である。本実施形態では、画像形成装置１として、スキャナー装置１３（画像読取装置）を備えた胴内排紙型のモノクロ複写機を例示する。なお、本発明が適用される装置は本実施形態に限られるものではなく、例えばカラー複写機、スキャナー装置、ファクシミリ装置、或いは複合機であってもよい。 Hereinafter, embodiments of the present invention will be described in detail based on the drawings. FIG. 1 is a cross-sectional view showing a schematic configuration of an image forming apparatus 1 according to an embodiment of the present invention. In the present embodiment, as the image forming apparatus 1, an in-body discharge type monochrome copying machine including a scanner device 13 (image reading device) is illustrated. The apparatus to which the present invention is applied is not limited to the present embodiment, and may be, for example, a color copying machine, a scanner apparatus, a facsimile apparatus, or a multifunction apparatus.
　画像形成装置１は、略直方体の本体ハウジング１０と、本体ハウジング１０の上面に配置された自動原稿給送装置１１とを含む。本体ハウジング１０は、シートに画像形成処理を行う各種の機器を収容する筐体である。自動原稿給送装置１１は、複写対象となる原稿シートを、本体ハウジング１０の上面に設定されている画像読取位置（第２コンタクトガラス１３２の上面）を経由して自動搬送する。自動原稿給送装置１１の左方内部には、原稿シートの搬送装置１２が組み込まれている。 The image forming apparatus 1 includes a substantially rectangular parallelepiped main body housing 10 and an automatic document feeder 11 disposed on the upper surface of the main body housing 10. The main body housing 10 is a housing that houses various devices that perform image forming processing on sheets. The automatic document feeder 11 automatically conveys a document sheet to be copied via an image reading position set on the upper surface of the main body housing 10 (upper surface of the second contact glass 132). A document sheet conveying device 12 is incorporated in the left side of the automatic document feeder 11.
　本体ハウジング１０の上部には、原稿シートの画像を光学的に読み取るためのスキャナー装置１３が収容されている。スキャナー装置１３については、後記で詳述する。スキャナー装置１３の下方には、画像形成後のシートを収容可能な胴内排紙部１４が設けられている。本体ハウジング１０の下部には、画像形成処理が施されるシートを収容する給紙カセット１５が、着脱自在に装着されている。本体ハウジング１０の右側壁には、手差しトレイ１６が取り付けられている。 A scanner device 13 for optically reading an image of a document sheet is accommodated in the upper part of the main body housing 10. The scanner device 13 will be described in detail later. Below the scanner device 13, an in-body sheet discharge unit 14 that can store a sheet after image formation is provided. A paper feed cassette 15 that accommodates a sheet on which image forming processing is performed is detachably attached to the lower portion of the main body housing 10. A manual feed tray 16 is attached to the right side wall of the main body housing 10.
　本体ハウジング１０は、胴内排紙部１４の空間に向けて開口した第１排出口１４１及び第２排出口１４２を含む。第１排出口１４１から排紙されるシートは、胴内排紙トレイ１４３で受け取られる。胴内排紙トレイ１４３の上方には、サブ排紙トレイ１４４が装着されている。サブ排紙トレイ１４４には、第２排出口１４２から排出されるシートが積載される、若しくは、両面印刷されるシートが、スイッチバック搬送のため一時的に排紙される。 The main body housing 10 includes a first discharge port 141 and a second discharge port 142 that open toward the space of the in-body discharge unit 14. A sheet discharged from the first discharge port 141 is received by the in-body discharge tray 143. A sub discharge tray 144 is mounted above the in-body discharge tray 143. A sheet discharged from the second discharge port 142 is stacked on the sub discharge tray 144, or a sheet to be printed on both sides is temporarily discharged for switchback conveyance.
　本体ハウジング１０内には、上述のスキャナー装置１３及び給紙カセット１５に加えて、画像形成部２０、定着部３０及びシート搬送路が収容されている。画像形成部２０は、スキャナー装置１３から出力される画像データに基づいてシートに画像を形成する。画像形成部２０は、感光体ドラム２１と、この感光体ドラム２１の周囲に配置された、帯電器２２、露光装置２３、現像装置２４、転写ローラー２５及びクリーニング装置２６とを含む。感光体ドラム２１は、その軸回りに回転し、静電潜像及びトナー像が形成される周面を備える。帯電器２２は、感光体ドラム２１の前記周面を均一に帯電する。露光装置２３は、静電潜像を形成するために、感光体ドラム２１の前記周面にレーザー光を照射する。現像装置２４は、感光体ドラム２１上に形成された静電潜像を現像するために、感光体ドラム２１の周面にトナーを供給する。転写ローラー２５は、感光体ドラム２１と転写ニップ部を形成し、感光体ドラム２１上のトナー像をシートに転写する。クリーニング装置２６は、トナー像転写後の感光体ドラム２１の周面を清掃する。現像装置２４にトナーを補給するトナーコンテナ２７が、現像装置２４に隣接して配置されている。 In the main body housing 10, in addition to the scanner device 13 and the paper feed cassette 15 described above, an image forming unit 20, a fixing unit 30, and a sheet conveyance path are accommodated. The image forming unit 20 forms an image on a sheet based on the image data output from the scanner device 13. The image forming unit 20 includes a photosensitive drum 21, and a charger 22, an exposure device 23, a developing device 24, a transfer roller 25, and a cleaning device 26 disposed around the photosensitive drum 21. The photosensitive drum 21 rotates around its axis and includes a peripheral surface on which an electrostatic latent image and a toner image are formed. The charger 22 uniformly charges the peripheral surface of the photosensitive drum 21. The exposure device 23 irradiates the peripheral surface of the photosensitive drum 21 with laser light in order to form an electrostatic latent image. The developing device 24 supplies toner to the peripheral surface of the photosensitive drum 21 in order to develop the electrostatic latent image formed on the photosensitive drum 21. The transfer roller 25 forms a transfer nip portion with the photosensitive drum 21 and transfers the toner image on the photosensitive drum 21 to a sheet. The cleaning device 26 cleans the peripheral surface of the photosensitive drum 21 after the toner image is transferred. A toner container 27 for supplying toner to the developing device 24 is disposed adjacent to the developing device 24.
　定着部３０は、熱源が内蔵された定着ローラー３１と、定着ローラー３１と共に定着ニップ部を形成する加圧ローラー３２とを含む。定着部３０は、前記転写ニップ部においてトナー像が転写されたシートを、前記定着ニップ部において加熱及び加圧することで、定着処理を施す。定着処理されたシートは、第１排出口１４１又は第２排出口１４２から胴内排紙部１４に向けて排出される。 The fixing unit 30 includes a fixing roller 31 with a built-in heat source, and a pressure roller 32 that forms a fixing nip portion together with the fixing roller 31. The fixing unit 30 performs a fixing process by heating and pressurizing the sheet on which the toner image is transferred in the transfer nip portion in the fixing nip portion. The fixed sheet is discharged from the first discharge port 141 or the second discharge port 142 toward the in-body discharge unit 14.
　シート搬送路は、本体ハウジング１０の下部付近から上部付近まで、画像形成部２０及び定着部３０を経由して、上下方向に延びるメイン搬送路Ｐ１を含む。メイン搬送路Ｐ１の下流端付近において、シートを第１排出口１４１に導く第１排出搬送路Ｐ２が分岐している。また、メイン搬送路Ｐ１の最下流端（上端）には、シートを第２排出口１４２に導く第２排出搬送路Ｐ３が接続されている。さらに、両面印刷の際にシートを反転搬送する反転搬送路Ｐ４が、メイン搬送路Ｐ１の最下流端から上流端付近まで延設されている。 The sheet conveyance path includes a main conveyance path P1 extending in the vertical direction from the vicinity of the lower part of the main body housing 10 to the vicinity of the upper part via the image forming unit 20 and the fixing unit 30. Near the downstream end of the main transport path P1, a first discharge transport path P2 that leads the sheet to the first discharge port 141 is branched. A second discharge conveyance path P3 that guides the sheet to the second discharge port 142 is connected to the most downstream end (upper end) of the main conveyance path P1. Further, a reverse conveyance path P4 that reverses and conveys the sheet during duplex printing extends from the most downstream end of the main conveyance path P1 to the vicinity of the upstream end.
　給紙カセット１５は、シート束を収容するシート収容部１５１を備える。シート収容部１５１の右上付近には、前記シート束の最上層のシートを１枚ずつ繰り出すピックアップローラー１５２と、そのシートをメイン搬送路Ｐ１の上流端に送り出す給紙ローラー対１５３とが備えられている。手差しトレイ１６に載置されたシートは、手差し給紙ローラー１６１によって、メイン搬送路Ｐ１の上流端に送り出される。メイン搬送路Ｐ１の画像形成部２０よりも上流側には、所定のタイミングでシートを転写ニップ部に送り出すレジストローラー対１５４が配置されている。 The paper feed cassette 15 includes a sheet storage unit 151 that stores a sheet bundle. A pickup roller 152 that feeds out the uppermost sheet of the sheet bundle one by one and a paper feed roller pair 153 that feeds the sheet to the upstream end of the main transport path P1 are provided near the upper right of the sheet storage unit 151. Yes. The sheet placed on the manual feed tray 16 is sent out to the upstream end of the main transport path P1 by the manual feed roller 161. A registration roller pair 154 that feeds the sheet to the transfer nip portion at a predetermined timing is disposed upstream of the image forming unit 20 in the main conveyance path P1.
　シートに片面印刷処理が行われる場合、シート収容部１５１又は手差しトレイ１６からシートがメイン搬送路Ｐ１に送り出され、該シートに画像形成部２０においてトナー像の転写処理が、定着部３０において転写されたトナーをシートに定着させる定着処理が、各々施される。その後、該シートは、第１排出搬送路Ｐ２を経て、第１排出口１４１から胴内排紙トレイ１４３上に排紙される。一方、シートに両面印刷処理が行われる場合、シートの片面に対して転写処理及び定着処理が施された後、該シートは、第２排出搬送路Ｐ３を経て、第２排出口１４２からサブ排紙トレイ１４４上に一部が排紙される。その後、該シートはスイッチバック搬送され、反転搬送路Ｐ４を経て、メイン搬送路Ｐ１の上流端付近に戻される。しかる後、シートの他面に対して転写処理及び定着処理が施され、該シートは、第１排出搬送路Ｐ２を経て、第１排出口１４１から胴内排紙トレイ１４３上に排紙される。 When a single-sided printing process is performed on a sheet, the sheet is sent out from the sheet storage unit 151 or the manual feed tray 16 to the main conveyance path P1, and the transfer process of the toner image is transferred to the sheet in the image forming unit 20 in the fixing unit 30. A fixing process for fixing the toner to the sheet is performed. Thereafter, the sheet is discharged from the first discharge port 141 onto the in-body discharge tray 143 through the first discharge conveyance path P2. On the other hand, when the double-sided printing process is performed on the sheet, after the transfer process and the fixing process are performed on one side of the sheet, the sheet passes through the second discharge conveyance path P3 and is then discharged from the second discharge port 142 to the sub discharge. A part is discharged onto the paper tray 144. Thereafter, the sheet is conveyed in a switchback manner, and returned to the vicinity of the upstream end of the main conveyance path P1 through the reverse conveyance path P4. Thereafter, a transfer process and a fixing process are performed on the other surface of the sheet, and the sheet is discharged from the first discharge port 141 onto the in-body discharge tray 143 through the first discharge conveyance path P2. .
　続いて、スキャナー装置１３について詳述する。スキャナー装置１３は、スキャナー筐体１３０と、このスキャナー筐体１３０の上面に嵌め込まれた、手置き読取用の第１コンタクトガラス１３１と自動読取用の第２コンタクトガラス１３２とを備える。第１コンタクトガラス１３１の上面は、ユーザーが載置する原稿シートの原稿読取面となる。第２コンタクトガラス１３２の上面は、自動原稿給送装置１１から自動給送される原稿シートが通過する原稿読取面となる。 Subsequently, the scanner device 13 will be described in detail. The scanner device 13 includes a scanner housing 130, and a first contact glass 131 for manual reading and a second contact glass 132 for automatic reading that are fitted on the upper surface of the scanner housing 130. The upper surface of the first contact glass 131 serves as a document reading surface of a document sheet placed by the user. The upper surface of the second contact glass 132 serves as a document reading surface through which a document sheet automatically fed from the automatic document feeder 11 passes.
　スキャナー装置１３は、スキャナー筐体１３０に収容された、照明ユニット５、ミラーユニット７３、集光レンズユニット８（光学系）及び撮像素子９を含む。照明ユニット５は、前記原稿読取面上の原稿シートに照明光を照射する。照明ユニット５には、前記照明光を原稿読取位置に向けて発する光源としての有機ＥＬ発光体６と、前記照明光を原稿読取位置に向かわせる反射板７１と、前記照明光が照射された原稿シートからの反射光を反射する第１反射ミラー７２とが搭載されている。ミラーユニット７３には、前記反射光の光路を反転させるために、第２反射ミラー７３１及び第３反射ミラー７３２が搭載されている。 The scanner device 13 includes an illumination unit 5, a mirror unit 73, a condenser lens unit 8 (optical system), and an image sensor 9 housed in a scanner housing 130. The illumination unit 5 irradiates the original sheet on the original reading surface with illumination light. The illumination unit 5 includes an organic EL light emitter 6 as a light source that emits the illumination light toward the document reading position, a reflector 71 that directs the illumination light toward the document reading position, and a document irradiated with the illumination light. A first reflection mirror 72 that reflects light reflected from the sheet is mounted. The mirror unit 73 is equipped with a second reflecting mirror 731 and a third reflecting mirror 732 in order to reverse the optical path of the reflected light.
　照明ユニット５は、第１、第２コンタクトガラス１３１、１３２の下面（原稿読取面の下方）に沿って、左右方向（副走査方向）に往復移動する。ミラーユニット７３は、照明ユニット５の１／２の移動量で左右方向に往復移動する。照明ユニット５は、原稿シートが自動原稿給送装置１１から自動給送されるとき、第２コンタクトガラス１３２の直下に移動し、静止状態となる。この静止状態において、有機ＥＬ発光体６から原稿シートに向けて照明光が発せられる。一方、原稿シートが第１コンタクトガラス１３１上に載置されるとき、照明ユニット５は、第１コンタクトガラス１３１の左端直下から原稿シートのサイズに応じて右方へ移動する。この移動の際に、有機ＥＬ発光体６から原稿シートに向けて照明光が発せられる。ミラーユニット７３は、照明ユニット５の１／２の移動量で、照明ユニット５に追従して右方に移動する。 The illumination unit 5 reciprocates in the left-right direction (sub-scanning direction) along the lower surfaces of the first and second contact glasses 131 and 132 (below the document reading surface). The mirror unit 73 reciprocates in the left-right direction with a movement amount ½ that of the illumination unit 5. When the document sheet is automatically fed from the automatic document feeder 11, the illumination unit 5 moves immediately below the second contact glass 132 and becomes stationary. In this stationary state, illumination light is emitted from the organic EL light emitter 6 toward the document sheet. On the other hand, when the document sheet is placed on the first contact glass 131, the illumination unit 5 moves to the right according to the size of the document sheet from directly below the left end of the first contact glass 131. During this movement, illumination light is emitted from the organic EL light emitter 6 toward the document sheet. The mirror unit 73 follows the lighting unit 5 and moves to the right by a movement amount that is ½ of that of the lighting unit 5.
　有機ＥＬ発光体６は、原稿シートに対し、主走査方向に長いライン状の照明光を照射する。有機ＥＬ発光体６は、第１、第２コンタクトガラス１３１、１３２に対して所定の角度を持って対向配置されている。有機ＥＬ発光体６の発光面の法線は、該有機ＥＬ発光体６が発する照明光が原稿読取位置に配向するよう、概ね原稿読取位置と交差している。反射板７１は、画像読取位置を含む垂直面を挟んで有機ＥＬ発光体６と概ね対称に配置されている。前記照明光の拡散光の一部は、反射板７１により反射されて前記原稿読取位置に向かう。第１反射ミラー７２は、有機ＥＬ発光体６が原稿シートに向けて発した照明光の反射光を、ミラーユニット７３の第２反射ミラー７３１へ向わせるように反射する。 The organic EL light emitter 6 irradiates the original sheet with linear illumination light that is long in the main scanning direction. The organic EL light emitter 6 is disposed to face the first and second contact glasses 131 and 132 with a predetermined angle. The normal line of the light emitting surface of the organic EL light emitter 6 substantially intersects the original reading position so that the illumination light emitted from the organic EL light emitter 6 is oriented to the original reading position. The reflection plate 71 is disposed substantially symmetrically with the organic EL light emitter 6 with a vertical plane including the image reading position interposed therebetween. Part of the diffused light of the illumination light is reflected by the reflecting plate 71 and travels toward the document reading position. The first reflecting mirror 72 reflects the reflected light of the illumination light emitted from the organic EL light emitter 6 toward the document sheet so as to be directed toward the second reflecting mirror 731 of the mirror unit 73.
　第２反射ミラー７３１は、第１反射ミラー７２が左方に向けて反射した前記反射光を、第３反射ミラー７３２に向けて下方へ反射する。第３反射ミラー７３２は、前記反射光を集光レンズユニット８に向かうように右方へ反射する。集光レンズユニット８は、第３反射ミラー７３２において反射された反射光の光像を、撮像素子９の撮像面に結像させる。撮像素子９は、ＣＣＤ（ｃｈａｒｇｅ　ｃｏｕｐｌｅｄ　ｄｅｖｉｃｅ）等からなり、前記反射光を受光してアナログ電気信号に光電変換する。このアナログ電気信号は、Ａ／Ｄ変換回路（図略）によってデジタル電気信号に変換された後、上述の露光装置２３に画像データとして入力される。 The second reflection mirror 731 reflects the reflected light reflected toward the left by the first reflection mirror 72 toward the third reflection mirror 732. The third reflection mirror 732 reflects the reflected light to the right so as to go to the condenser lens unit 8. The condensing lens unit 8 forms an optical image of the reflected light reflected by the third reflecting mirror 732 on the imaging surface of the imaging element 9. The image sensor 9 is composed of a CCD (charge coupled device) or the like, and receives the reflected light and photoelectrically converts it into an analog electric signal. The analog electrical signal is converted into a digital electrical signal by an A / D conversion circuit (not shown), and then input to the exposure device 23 as image data.
　次に、照明ユニット５について詳細に説明する。図２は、照明ユニット５の斜視図、図３は、照明ユニット５の主走査方向端部の拡大斜視図、図４は、図２のＩＶ－ＩＶ線断面図である。照明ユニット５は、上述の有機ＥＬ発光体６及び反射板７１（反射体）と、これらを保持するフレーム部材５０とを含む。 Next, the lighting unit 5 will be described in detail. 2 is a perspective view of the illumination unit 5, FIG. 3 is an enlarged perspective view of the end of the illumination unit 5 in the main scanning direction, and FIG. 4 is a sectional view taken along line IV-IV in FIG. The illumination unit 5 includes the organic EL light emitter 6 and the reflection plate 71 (reflector) described above, and a frame member 50 that holds them.
　有機ＥＬ（Ｅｌｅｃｔｒｏ－Ｌｕｍｉｎｅｓｃｅｎｃｅ）発光体６は、有機化合物からなる薄肉の発光層と、この発光層を挟んで配置された陽極及び陰極とを備え、原稿シートの主走査方向に長い平板状で、可撓性を有する照明用の発光体である。有機ＥＬ発光体６は、照明光を発する発光面６Ｆと、その反対側の裏面６Ｂとを備え、発光面６Ｆが原稿読取面Ｒの原稿読取位置ＲＡと対向するようにフレーム部材５０で保持されている。反射板７１は、照明光を反射するミラー面を備え、主走査方向において有機ＥＬ発光体６とほぼ同じ長さを備えた細長い平板状部材である。反射板７１の法線が概ね原稿読取位置ＲＡに向かうように、反射板７１はフレーム部材５０で保持されている。 An organic EL (Electro-Luminescence) light emitter 6 includes a thin light-emitting layer made of an organic compound, and an anode and a cathode disposed with the light-emitting layer sandwiched therebetween, and has a flat plate shape that is long in the main scanning direction of the original sheet. It is a light emitting body for illumination having flexibility. The organic EL light emitter 6 includes a light emitting surface 6F that emits illumination light and a back surface 6B opposite to the light emitting surface 6F, and is held by the frame member 50 so that the light emitting surface 6F faces the document reading position RA of the document reading surface R. ing. The reflection plate 71 is an elongated flat plate member having a mirror surface that reflects illumination light and having substantially the same length as the organic EL light emitter 6 in the main scanning direction. The reflecting plate 71 is held by the frame member 50 so that the normal line of the reflecting plate 71 is generally directed to the document reading position RA.
　フレーム部材５０は、板金の加工部材からなり、前後方向（主走査方向）に長い水平板５０１と、水平板５０１から上方に立設された第１保持部５１及び第２保持部５２と、水平板５０１に穿孔された前後方向に長いスリット部５３とを含む。水平板５０１の主走査方向の両端には、折り曲げ部分からなる係合部５０２が設けられている。この係合部５０２には、フレーム部材５０（照明ユニット５）を副走査方向へスムースに移動させるための滑車類が取り付けられる。 The frame member 50 is made of a sheet metal working member, and has a horizontal plate 501 that is long in the front-rear direction (main scanning direction), a first holding unit 51 and a second holding unit 52 that are erected upward from the horizontal plate 501, And a slit 53 that is long in the front-rear direction and is perforated in the plate 501. Engaging portions 502 formed of bent portions are provided at both ends of the horizontal plate 501 in the main scanning direction. To the engaging portion 502, pulleys for smoothly moving the frame member 50 (illumination unit 5) in the sub-scanning direction are attached.
　第１保持部５１は、有機ＥＬ発光体６を保持するために設けられている。図４に示すように、第１保持部５１は、水平板５０１の右方側に配置されたフレーム枠体であり、有機ＥＬ発光体６を保持するための取り付け面５４Ｓを形成する第１斜面部５４を有している。取り付け面５４Ｓは、副走査断面において、水平面に対して概ね４５度傾斜した平面であり、原稿読取面Ｒ（原稿読取位置ＲＡ）に対向している。有機ＥＬ発光体６は、その裏面６Ｂが取り付け面５４Ｓに沿うようにして、第１斜面部５４に取り付けられている。なお、裏面６Ｂと取り付け面５４Ｓとの間には接合部材５４Ａが介在されており、有機ＥＬ発光体６は強固に取り付け面５４Ｓに保持されている。接合部材５４Ａは、例えば両面テープ、有機接着剤層などである。 The first holding unit 51 is provided to hold the organic EL light emitter 6. As shown in FIG. 4, the first holding portion 51 is a frame frame disposed on the right side of the horizontal plate 501, and forms a first inclined surface that forms an attachment surface 54 </ b> S for holding the organic EL light emitter 6. A portion 54 is provided. The attachment surface 54S is a plane inclined substantially 45 degrees with respect to the horizontal plane in the sub-scanning section, and faces the document reading surface R (document reading position RA). The organic EL light emitter 6 is attached to the first inclined surface portion 54 so that the back surface 6B thereof is along the attachment surface 54S. Note that a bonding member 54A is interposed between the back surface 6B and the attachment surface 54S, and the organic EL light emitter 6 is firmly held on the attachment surface 54S. The joining member 54A is, for example, a double-sided tape or an organic adhesive layer.
　第２保持部５２は、反射板７１を保持するために設けられている。第２保持部５２は、水平板５０１の左方側に配置された絞り加工部分であり、反射板７１を保持するための支持面５５Ｓ（他方の取り付け面）を形成する第２斜面部５５を有している。支持面５５Ｓは、副走査断面において、水平面に対して概ね４５度傾斜した平面であり、原稿読取面Ｒ（原稿読取位置ＲＡ）に対向している。支持面５５Ｓは、取り付け面５４Ｓと概ね高さ位置にあり、傾斜方向は互いに逆である。副走査断面において、水平板５０１、支持面５５Ｓ及び取り付け面５４Ｓにより、概ねすり鉢状の凹部が形成されている。反射板７１は、その裏面が支持面５５Ｓに密接した状態で、第２斜面部５５に保持されている。 The second holding part 52 is provided for holding the reflection plate 71. The second holding portion 52 is a drawing processed portion disposed on the left side of the horizontal plate 501, and includes a second inclined surface portion 55 that forms a support surface 55 </ b> S (the other attachment surface) for holding the reflecting plate 71. Have. The support surface 55S is a plane that is inclined at approximately 45 degrees with respect to the horizontal plane in the sub-scan section, and faces the document reading surface R (document reading position RA). The support surface 55S is substantially at a height position with respect to the attachment surface 54S, and the inclination directions are opposite to each other. In the sub-scanning cross section, the horizontal plate 501, the support surface 55 </ b> S, and the attachment surface 54 </ b> S form a generally mortar-shaped recess. The reflection plate 71 is held by the second inclined surface portion 55 with the back surface thereof being in close contact with the support surface 55S.
　スリット部５３は、原稿シートからの反射光を水平板５０１の下方へ導くためのスリットである。図４には、照明光Ｌ１、Ｌ２、及び反射光Ｌ３の光路が記載されている。有機ＥＬ発光体６の発光面６Ｆから発せられた照明光Ｌ１は、原稿読取位置ＲＡに向かう。一方、発光面６Ｆから発せられた拡散照明光Ｌ２は、反射板７１により反射されて、原稿読取位置ＲＡに向かう。これら照明光Ｌ１、Ｌ２は、原稿読取位置ＲＡに載置若しくは通過する原稿シートによって反射され、反射光Ｌ３となって鉛直下方に向かう。反射光Ｌ３は、スリット部５３を通過し、図４では図略の第１反射ミラー７２で反射される。 The slit portion 53 is a slit for guiding reflected light from the original sheet to the lower side of the horizontal plate 501. FIG. 4 shows the optical paths of the illumination lights L1 and L2 and the reflected light L3. The illumination light L1 emitted from the light emitting surface 6F of the organic EL light emitter 6 goes to the document reading position RA. On the other hand, the diffuse illumination light L2 emitted from the light emitting surface 6F is reflected by the reflecting plate 71 and travels toward the document reading position RA. These illumination lights L1 and L2 are reflected by the original sheet placed or passed at the original reading position RA, and become reflected light L3 and travel vertically downward. The reflected light L3 passes through the slit portion 53 and is reflected by a first reflecting mirror 72 (not shown in FIG. 4).
　本実施形態において有機ＥＬ発光体６は、発光面６Ｆの幅が比較的狭い中央部６１と、発光面６Ｆの幅が比較的広い一対の端部６２とを備えている。すなわち、発光面６Ｆの主走査方向における単位長さ当たりの面積が、主走査方向の中央部６１よりも端部６２の方が大きく設定されている。これにより、端部６２の方が発光面６Ｆの面積が大きいことに伴い、発光量が中央部６１よりも端部６２の方が多くなる。以下、かかる構成の意義について説明する。 In the present embodiment, the organic EL light emitter 6 includes a central portion 61 having a relatively narrow width of the light emitting surface 6F and a pair of end portions 62 having a relatively wide width of the light emitting surface 6F. That is, the area per unit length in the main scanning direction of the light emitting surface 6F is set to be larger at the end 62 than at the central portion 61 in the main scanning direction. As a result, the end 62 has a larger light emitting surface 6F, and the amount of emitted light is greater at the end 62 than at the center 61. Hereinafter, the significance of such a configuration will be described.
　図５Ａは、本発明に適用可能な有機ＥＬ発光体６０１の発光面６Ｆの形状を示す平面図である。有機ＥＬ発光体６０１は、主走査方向の全長に亘って均一な幅を有する長方形の発光面６Ｆを備える。この場合、発光面からの発光量は、主走査方向の端部から中央部にかけてほぼ均一となる。本発明において、このような有機ＥＬ発光体６０１を照明ユニット５に組み付けることは勿論可能である。しかしながら、主走査方向の全長に亘って均一な光量の光を撮像素子９に入射させるという観点からは、図２に示すように、端部６２が幅広とされた有機ＥＬ発光体６を用いることが望ましい。 FIG. 5A is a plan view showing the shape of the light emitting surface 6F of the organic EL light emitting body 601 applicable to the present invention. The organic EL light emitter 601 includes a rectangular light emitting surface 6F having a uniform width over the entire length in the main scanning direction. In this case, the amount of light emitted from the light emitting surface is substantially uniform from the end to the center in the main scanning direction. In the present invention, it is of course possible to assemble such an organic EL light emitting body 601 to the illumination unit 5. However, from the viewpoint of allowing light with a uniform light amount to enter the image sensor 9 over the entire length in the main scanning direction, as shown in FIG. 2, the organic EL light emitter 6 having the wide end 62 is used. Is desirable.
　図５Ｂは、有機ＥＬ発光体６０１を光源として用いた場合における、集光レンズユニット８の通過後の光量分布を示すグラフである。このグラフに示すように、原稿シートからの反射光を撮像素子９へレンズ光学系にて結像させる構成では、レンズの特性上、主走査方向の端部の光量が低下する傾向がある。これは、主走査方向の走査幅の＋端部及び－端部付近では、レンズを通過する光が少なくなるからである。従って、光源自体が前記走査幅の全長に亘って均一な光量の照明光を発していても、その反射光が集光レンズユニット８を通過すると、＋端部及び－端部付近の光量が中央付近に比べて低下してしまう。このような光が撮像素子９へ入射すると、主走査方向の端部の露光が不十分となる懸念がある。 FIG. 5B is a graph showing a light amount distribution after passing through the condenser lens unit 8 when the organic EL light-emitting body 601 is used as a light source. As shown in this graph, in the configuration in which the reflected light from the document sheet is imaged onto the image sensor 9 by the lens optical system, the light quantity at the end in the main scanning direction tends to decrease due to the characteristics of the lens. This is because less light passes through the lens near the + end and − end of the scanning width in the main scanning direction. Therefore, even if the light source itself emits illumination light with a uniform light amount over the entire length of the scanning width, when the reflected light passes through the condenser lens unit 8, the light amounts near the + end and − end are centered. It will be lower than the vicinity. When such light enters the image sensor 9, there is a concern that the exposure of the end portion in the main scanning direction becomes insufficient.
　図５Ｃは、照明ユニット５の光源としての好ましい光量分布を示すグラフである。このグラフは、主走査方向の＋端部及び－端部付近の光量が中央付近に比べて高い光量分布を備えている。このような光量分布を備える光源であれば、集光レンズユニット８の通過時における端部の光量低下分を補うことができる。従って、撮像素子９に入射させる光量を、主走査方向の全長に亘って均一にすることができる。 FIG. 5C is a graph showing a preferable light amount distribution as a light source of the illumination unit 5. This graph has a light amount distribution in which the light amount near the + end and − end in the main scanning direction is higher than that near the center. If the light source has such a light amount distribution, it is possible to compensate for the decrease in the light amount at the end when the condenser lens unit 8 passes. Accordingly, the amount of light incident on the image sensor 9 can be made uniform over the entire length in the main scanning direction.
　本実施形態においては、光源として有機ＥＬ発光体が用いられる。有機ＥＬ発光体、一般に単位面積当たりで均一な光線を発し、その発光量は発光面の面積に依存する。従って、図５Ｃのような光量分布は、発光面の面積を調整することにより、具体的には主走査方向の＋端部及び－端部付近の発光面の面積を中央付近に比べて大きくすることにより、容易に得ることができる。 In the present embodiment, an organic EL light emitter is used as a light source. An organic EL light emitter, generally emitting uniform light per unit area, the amount of light emission depends on the area of the light emitting surface. Therefore, in the light amount distribution as shown in FIG. 5C, by adjusting the area of the light emitting surface, specifically, the area of the light emitting surface near the + end and − end in the main scanning direction is made larger than that near the center. Therefore, it can be easily obtained.
　図６Ａ～図６Ｅは、図５Ｃのような光量分布を得ることが可能な、有機ＥＬ発光体の発光面形状の各種の例を示す平面図である。図６Ａは、図２～図４に例示した有機ＥＬ発光体６の発光面６Ｆの平面形状を示している。有機ＥＬ発光体６は、露光に必要な光量を発することができる幅（標準幅）を有する中央部６１と、集光レンズユニット８の通過時における端部の光量低下分を補填することができるよう増加された幅（増加幅）を有する一対の端部６２と、中央部６１と端部６２の間に各々設けられたテーパ部６２１とを備えている。当然、主走査方向の単位長さ当たりの面積は中央部６１より端部６２の方が大きい。テーパ部６２１においては、単位長さ当たりの面積は、主走査方向の＋又は－の軸外方向に向かうに連れて大きくなっている。 6A to 6E are plan views showing various examples of the light emitting surface shape of the organic EL light emitter that can obtain the light quantity distribution as shown in FIG. 5C. FIG. 6A shows the planar shape of the light emitting surface 6F of the organic EL light emitter 6 illustrated in FIGS. The organic EL light emitter 6 can compensate for the light amount decrease at the end when the condenser lens unit 8 passes through the central portion 61 having a width (standard width) that can emit a light amount necessary for exposure. A pair of end portions 62 having such an increased width (increased width), and tapered portions 621 provided between the central portion 61 and the end portion 62, respectively. Naturally, the area per unit length in the main scanning direction is larger at the end portion 62 than at the central portion 61. In the taper portion 621, the area per unit length increases with increasing toward the + or − off-axis direction in the main scanning direction.
　図６Ｂの有機ＥＬ発光体６０２は、前記標準幅を有する中央部６１Ａと、前記増加幅を有する矩形の端部６２Ａとを備えている。有機ＥＬ発光体６０２には、上掲の有機ＥＬ発光体６のようなテーパ部６２１が存在せず、中央部６１Ａと端部６２Ａとの境界部には、幅員の相違に基づく段差を有している。図６Ｃの有機ＥＬ発光体６０３は、前記標準幅を有する中央部６１Ｂと、単位長さ当たりの面積が、主走査方向の＋又は－の軸外方向に向かうに連れて大きくなる端部６２Ｂとを備えている。端部６２Ｂは台形型の形状を有し、上底が中央部６１Ｂと同幅であり、下底が中央部６１Ｂよりも幅広である。 6B includes a central portion 61A having the standard width and a rectangular end portion 62A having the increased width. The organic EL illuminator 602 does not have the tapered portion 621 as in the organic EL illuminator 6 described above, and the boundary between the central portion 61A and the end portion 62A has a step based on the difference in width. ing. The organic EL light emitter 603 of FIG. 6C includes a central portion 61B having the standard width, and an end portion 62B whose area per unit length increases toward the + or − off-axis direction in the main scanning direction. It has. The end portion 62B has a trapezoidal shape, and the upper base is the same width as the central portion 61B, and the lower base is wider than the central portion 61B.
　図６Ｄは、中央部と端部とが一体型のものではなく、分離された態様の有機ＥＬ発光体６０４を示している。有機ＥＬ発光体６０４は、前記標準幅を有する第１の発光体からなる中央部６１Ｃと、前記増加幅を有する第２の発光体からなる一対の端部６２Ｃとを有している。 FIG. 6D shows the organic EL light-emitting body 604 in a state in which the central portion and the end portion are not integrated, but are separated. The organic EL light emitter 604 has a central portion 61C made of the first light emitter having the standard width and a pair of end portions 62C made of the second light emitter having the increased width.
　図６Ｅは、中央部と端部とが分離された態様であって、発光量が異なる２種の発光体を用いてなる有機ＥＬ発光体６０５を示している。有機ＥＬ発光体６０５は、前記標準幅を有し、且つ所定の第１の発光量の光線を発する第１の発光体からなる中央部６１Ｄと、前記標準幅を有し、且つ前記第１の発光量よりも多い第２の発光量の光線を発する第２の発光体からなる一対の端部６２Ｄとを有している。この有機ＥＬ発光体６０５によれば、端部と中央部とで発光面の幅員を同一としながらも、端部の発光量が大きくなる光量分布を得ることができる。 FIG. 6E shows an organic EL light emitting body 605 using two kinds of light emitting bodies having different light emission amounts in a state where the central portion and the end portion are separated. The organic EL light emitter 605 has the standard width and a central portion 61D made of a first light emitter that emits a light beam having a predetermined first light emission amount, the standard width, and the first width. And a pair of end portions 62D made of a second light emitter that emits a light beam having a second light emission amount larger than the light emission amount. According to the organic EL light emitter 605, it is possible to obtain a light amount distribution in which the light emission amount at the end portion is increased while the width of the light emitting surface is the same at the end portion and the central portion.
　他の実施形態として、有機ＥＬ発光体の発光面の一部を覆い隠すことによって、図５Ｃのような光量分布を得るようにしても良い。図７に示す有機ＥＬ発光体６０６は、その発光面の一部を覆い隠すカバー部材６３を備えている。有機ＥＬ発光体６０６の発光面は主走査方向に長い長方形の形状を有し、その幅は前記標準幅よりも長いものが用いられる。カバー部材６３は、主走査方向の端部付近を除いて、前記発光面の主走査方向の両側辺近傍（２つの長辺の端縁近傍）を帯状に覆っている。 As another embodiment, a light amount distribution as shown in FIG. 5C may be obtained by covering part of the light emitting surface of the organic EL light emitter. The organic EL light emitter 606 shown in FIG. 7 includes a cover member 63 that covers a part of the light emitting surface. The light emitting surface of the organic EL light emitter 606 has a rectangular shape that is long in the main scanning direction, and the width thereof is longer than the standard width. The cover member 63 covers the vicinity of both sides of the light emitting surface in the main scanning direction (near the edges of the two long sides) except for the vicinity of the end in the main scanning direction.
　カバー部材６３としては、遮光テープ又はフィルム、遮光ペイント、又は遮光板などを用いることができる。発光面の一部がカバー部材６３で覆われることによって、前記標準幅を有する中央部６１Ｅと、前記増加幅を有する一対の端部６２Ｅとを形成することができる。このような有機ＥＬ発光体６０６であれば、単純な長方形の形状の有機ＥＬ発光体を用いつつ、前記発光面の主走査方向の中央部と端部とにおいて発光面積差を具備させることができる。 As the cover member 63, a light shielding tape or film, a light shielding paint, a light shielding plate, or the like can be used. By covering a part of the light emitting surface with the cover member 63, the central portion 61E having the standard width and the pair of end portions 62E having the increased width can be formed. With such an organic EL light emitter 606, a light emitting area difference can be provided between the central portion and the end portion in the main scanning direction of the light emitting surface while using a simple rectangular organic EL light emitter. .
　上記のようなカバー部材６３が、有機ＥＬ発光体６０７をフレーム部材５０に保持するための爪部材を兼ねることは、好ましい実施形態の一つである。図８Ａは、爪部材５４１（保持部材）で保持された有機ＥＬ発光体６０７を示す平面図、図８Ｂは図８ＡのＶＩＩＩＢ－ＶＩＩＩＢ線断面図である。この実施形態では、フレーム部材５０の第１保持部５１に備えられている第１斜面部５４Ａに、フック状の突起からなる爪部材５４１が設けられる。爪部材５４１は、第１斜面部５４Ａの取り付け面５４ＡＳに、有機ＥＬ発光体６０７の幅員に応じた間隔を置いて、一対で立設されている。 It is one of preferred embodiments that the cover member 63 as described above also serves as a claw member for holding the organic EL light emitter 607 on the frame member 50. 8A is a plan view showing the organic EL light emitter 607 held by the claw member 541 (holding member), and FIG. 8B is a sectional view taken along line VIIIB-VIIIB in FIG. 8A. In this embodiment, a claw member 541 made of a hook-shaped protrusion is provided on the first inclined surface portion 54 </ b> A provided in the first holding portion 51 of the frame member 50. The claw members 541 are erected in pairs on the attachment surface 54AS of the first slope portion 54A with an interval corresponding to the width of the organic EL light emitter 607.
　一対の爪部材５４１は、主走査方向の端部付近を除いて、有機ＥＬ発光体６０７の発光面の副走査方向の両側辺近傍を帯状に覆うと共に、当該部位において有機ＥＬ発光体６０７を保持している。発光面の一部が爪部材５４１で覆われることによって、前記標準幅を有する中央部６１Ｆと、前記増加幅を有する一対の端部６２Ｆとが形成されている。この実施形態によれば、発光面に前記発光面積差を具備させる場合において、爪部材５４１が上記カバー部材の役目を兼用するので、部品点数を減少させることができる。 The pair of claw members 541 covers the vicinity of both sides in the sub-scanning direction of the light emitting surface of the organic EL light emitting body 607 except for the vicinity of the end in the main scanning direction, and holds the organic EL light emitting body 607 at the portion. is doing. By covering a part of the light emitting surface with the claw member 541, a central portion 61F having the standard width and a pair of end portions 62F having the increased width are formed. According to this embodiment, since the claw member 541 also serves as the cover member when the light emitting surface has the light emitting area difference, the number of parts can be reduced.
　有機ＥＬ発光体は一般に可撓性を有するので、有機ＥＬ発光体を曲面に沿わせて組み付けることが可能である。図９Ａは、このメリットを利用した、好ましい実施形態を例示している。有機ＥＬ発光体６０８は、副走査方向の断面において湾曲した状態で、取り付け面を備えた第１斜面部５４Ｂに取り付けられている。 Since the organic EL light emitter is generally flexible, the organic EL light emitter can be assembled along a curved surface. FIG. 9A illustrates a preferred embodiment that takes advantage of this merit. The organic EL light emitter 608 is attached to the first inclined surface portion 54B having an attachment surface in a curved state in the cross section in the sub-scanning direction.
　第１斜面部５４Ｂは、副走査方向の断面において、原稿読取面Ｒに向けて凹の形状を有する円弧面である。有機ＥＬ発光体６０８は、前記凹の形状に沿って第１斜面部５４Ｂの取り付け面に取り付けられている。この実施形態によれば、有機ＥＬ発光体６０８は、副走査方向の断面において原稿読取面Ｒに向けて凹の形状を有する態様で、フレーム部材５０に保持される。従って、有機ＥＬ発光体６０８が発する照明光を、ターゲットとするポイントである原稿読取位置ＲＡに向けて集光させることができる。このことは、原稿読取位置ＲＡにおける照明光量を大きくすることに寄与する。 The first inclined surface portion 54B is an arc surface having a concave shape toward the document reading surface R in the cross section in the sub-scanning direction. The organic EL light emitter 608 is attached to the attachment surface of the first slope portion 54B along the concave shape. According to this embodiment, the organic EL light emitter 608 is held by the frame member 50 in a form having a concave shape toward the document reading surface R in the cross section in the sub-scanning direction. Therefore, the illumination light emitted from the organic EL light emitter 608 can be condensed toward the document reading position RA that is a target point. This contributes to increasing the amount of illumination light at the document reading position RA.
　集光効果を持たせる他の実施形態として、図９Ｂを例示する。この実施形態では、副走査方向の断面において、折り曲げによって形成された凹面を有する第１斜面部５４Ｃが用いられている。第１斜面部５４Ｃは、平板部材を主走査方向に延びる折り曲げ線に沿って２箇所で折り曲げることによって形成され、原稿読取面Ｒに対する傾斜角度が互いに異なる３つの斜面部分５４Ｃ１、５４Ｃ２、５４Ｃ３を有する。各斜面部分５４Ｃ１、５４Ｃ２、５４Ｃ３の表面を取り付け面として、有機ＥＬ発光体６０９、６１０、６１１がそれぞれ取り付けられている。このような態様によっても、３つの有機ＥＬ発光体６０９、６１０、６１１が発する照明光を、原稿読取位置ＲＡに向けて集中させ得る。 FIG. 9B is illustrated as another embodiment for providing a light collecting effect. In this embodiment, the first slope portion 54C having a concave surface formed by bending is used in the cross section in the sub-scanning direction. The first inclined surface portion 54C is formed by bending the flat plate member at two locations along a bending line extending in the main scanning direction, and has three inclined surface portions 54C1, 54C2, and 54C3 having different inclination angles with respect to the document reading surface R. . The organic EL light emitters 609, 610, and 611 are attached with the surfaces of the slope portions 54C1, 54C2, and 54C3 as attachment surfaces. Also in such an aspect, the illumination light emitted from the three organic EL light emitters 609, 610, and 611 can be concentrated toward the document reading position RA.
　図１０Ａ及び図１０Ｂは、主走査方向に凹の形状を有する取り付け面を備える実施形態を示す断面図である。これら実施形態もまた、図５Ｃに示す好ましい光量分布を得ることが可能な実施形態である。図１０Ａでは、取り付け面を有する第１斜面部５４Ｄは、中央平坦部５４Ｄ１と、端部平坦部５４Ｄ２と、これらの間の湾曲部５４Ｄ３とを備えている。 FIG. 10A and FIG. 10B are cross-sectional views showing an embodiment including an attachment surface having a concave shape in the main scanning direction. These embodiments are also embodiments capable of obtaining a preferable light amount distribution shown in FIG. 5C. In FIG. 10A, the first inclined surface portion 54D having a mounting surface includes a central flat portion 54D1, an end flat portion 54D2, and a curved portion 54D3 between them.
　第１斜面部５４Ｄの取り付け面は、主走査方向の断面において、原稿読取面Ｒに対する距離が、中央平坦部５４Ｄ１は所定の距離ｄ１であり、端部平坦部５４Ｄ２は距離ｄ１よりも短い距離ｄ２である。つまり、前記取り付け面は、原稿読取面Ｒに対する距離が、主走査方向の中央部よりも端部の方が短い凹の形状を有する面である。有機ＥＬ発光体６１２は、前記凹の形状に沿って、第１斜面部５４Ｄの取り付け面に取り付けられている。この実施形態によれば、主走査方向における有機ＥＬ発光体６１２が発する照明光の光量分布において、中央部よりも端部の方が原稿読取面Ｒに近い分だけ、端部の光量を多くすることができる。従って、発光面積を端部と中央部とで異ならせずとも、望ましい光量分布を作ることが可能である。 In the cross section in the main scanning direction, the attachment surface of the first inclined surface portion 54D has a distance to the document reading surface R. The central flat portion 54D1 is a predetermined distance d1, and the end flat portion 54D2 is a distance d2 shorter than the distance d1. It is. That is, the attachment surface is a surface having a concave shape with a distance from the document reading surface R that is shorter at the end than at the center in the main scanning direction. The organic EL light emitter 612 is attached to the attachment surface of the first slope portion 54D along the concave shape. According to this embodiment, in the light amount distribution of the illumination light emitted from the organic EL light emitter 612 in the main scanning direction, the light amount at the end is increased by the amount closer to the document reading surface R at the end than at the center. be able to. Therefore, it is possible to create a desirable light amount distribution without making the light emitting area different between the end portion and the central portion.
　図１０Ｂに示す実施形態では、取り付け面を有する第１斜面部５４Ｅは、中央平坦部５４Ｅ１と、中央平坦部５４Ｅ１の両端から延出する端部傾斜部５４Ｅ２とを備えている。第１斜面部５４Ｅの取り付け面は、主走査方向の断面において、原稿読取面Ｒに対する距離が、中央平坦部５４Ｅ１においては所定の距離ｄ１で一定である。一方、端部傾斜部５４Ｅ２では、軸外に向かうに連れて、距離ｄ２１から距離ｄ２２まで徐々に短くなっている。有機ＥＬ発光体６１３は、このような凹の形状を有する取り付け面に取り付けられている。当該実施形態であっても、同様に照明光の光量分布において、中央部よりも端部の方を多くすることができる。 In the embodiment shown in FIG. 10B, the first inclined surface portion 54E having the attachment surface includes a central flat portion 54E1 and end inclined portions 54E2 extending from both ends of the central flat portion 54E1. In the cross section in the main scanning direction, the attachment surface of the first slope portion 54E has a constant distance to the document reading surface R at a predetermined distance d1 in the central flat portion 54E1. On the other hand, in the end inclined portion 54E2, the distance from the distance d21 to the distance d22 is gradually shortened toward the off-axis. The organic EL light emitter 613 is attached to the attachment surface having such a concave shape. Even in this embodiment, similarly, in the light amount distribution of the illumination light, the end portion can be made larger than the center portion.
　以上、本発明の各種実施形態につき説明したが、本発明は上記実施形態に限定されるものではない。例えば、図４では、第１斜面部５４の取り付け面５４Ｓと第２斜面部５５の支持面５５Ｓ（取り付け面）とを、読み取り位置ＲＡを挟んで副走査方向に一対で設け、取り付け面５４Ｓには有機ＥＬ発光体６を、支持面５５Ｓには反射板７１を各々取り付ける例を示した。これに代えて、複数の有機ＥＬ発光体６を、読み取り位置ＲＡを挟んで副走査方向に複数配置しても良い。 Although various embodiments of the present invention have been described above, the present invention is not limited to the above embodiments. For example, in FIG. 4, the attachment surface 54S of the first slope portion 54 and the support surface 55S (attachment surface) of the second slope portion 55 are provided in a pair in the sub-scanning direction across the reading position RA, and are attached to the attachment surface 54S. Shows an example in which the organic EL luminous body 6 is attached and the reflecting plate 71 is attached to the support surface 55S. Instead of this, a plurality of organic EL light emitters 6 may be arranged in the sub-scanning direction across the reading position RA.
　図１１は、照明ユニット５の変形例を示す模式図である。この実施形態では、取り付け面を備えた２つの第１斜面部５４が、副走査方向に読み取り位置ＲＡを挟んで対向して配置されている。これら２つの取り付け面に、それぞれ有機ＥＬ発光体６が取り付けられている。この実施形態によれば、照明光量を増加させることができる。 FIG. 11 is a schematic diagram showing a modification of the lighting unit 5. In this embodiment, two first inclined surface portions 54 having attachment surfaces are arranged to face each other across the reading position RA in the sub-scanning direction. The organic EL light emitter 6 is attached to each of these two attachment surfaces. According to this embodiment, the amount of illumination light can be increased.
　以上の通り、本発明に係るスキャナー装置１３（画像読取装置）によれば、原稿読取面Ｒに対向する取り付け面５４Ｓに沿わせて有機ＥＬ発光体６を配置するという簡単な構成で、スキャナー装置１３の照明系を構築することができる。有機ＥＬ発光体６は、それ自身が面発光し、また発光に伴う発熱も殆ど無いので、ヒートシンクや導光体を適用する必要もないという利点がある。 As described above, according to the scanner device 13 (image reading device) according to the present invention, the scanner device has a simple configuration in which the organic EL light emitter 6 is disposed along the attachment surface 54S facing the document reading surface R. Thirteen illumination systems can be constructed. The organic EL light-emitting body 6 has an advantage that it itself emits surface light and hardly generates heat due to light emission, so that it is not necessary to apply a heat sink or a light guide.

Claims (10)

  1. 　原稿の画像を読み取る画像読取装置であって、
    　光を電気信号に変換する撮像素子と、
    　前記原稿が載置される又は通過する原稿読取面と、
    　前記原稿読取面の下方に配置され、前記原稿読取面上の原稿に照明光を照射する照明ユニットと、
    　前記原稿からの反射光を前記撮像素子に結像させる光学系と、を備え、
    　前記照明ユニットは、
    　　前記照明光を発する発光面と、その反対側の裏面とを有し、前記原稿の主走査方向に長い平板状の有機ＥＬ発光体と、
    　　前記原稿読取面に対向する取り付け面を備え、該取り付け面に前記裏面を沿わせて前記有機ＥＬ発光体を保持するフレーム部材と、
    を備える画像読取装置。     An image reading apparatus for reading an image of a document,
    An image sensor that converts light into an electrical signal;
    A document reading surface on which the document is placed or passed;
    An illumination unit that is disposed below the document reading surface and irradiates the document on the document reading surface with illumination light;
    An optical system that focuses reflected light from the original on the image sensor,
    The lighting unit is:
    A flat organic EL light emitter having a light emitting surface for emitting the illumination light and a back surface opposite to the light emitting surface, and being long in a main scanning direction of the original;
    A frame member that has an attachment surface facing the document reading surface, and holds the organic EL light emitter along the back surface with the attachment surface;
    An image reading apparatus comprising:
  2. 　請求項１に記載の画像読取装置において、
    　前記有機ＥＬ発光体は、前記発光面の前記主走査方向における単位長さ当たりの面積が、前記主走査方向の中央部よりも端部の方が大きく設定されている、画像読取装置。     The image reading apparatus according to claim 1,
    The organic EL illuminator is an image reading apparatus in which an area per unit length in the main scanning direction of the light emitting surface is set to be larger at an end portion than at a central portion in the main scanning direction.
  3. 　請求項２に記載の画像読取装置において、
    　前記発光面は、前記主走査方向に長い長方形の形状を有し、
    　前記主走査方向の端部付近を除いて、前記発光面の前記主走査方向と直交する副走査方向の側辺近傍を覆うカバー部材をさらに備える、画像読取装置。     The image reading apparatus according to claim 2,
    The light emitting surface has a long rectangular shape in the main scanning direction,
    An image reading apparatus, further comprising: a cover member that covers the vicinity of the side of the light emitting surface in the sub-scanning direction perpendicular to the main scanning direction, except for the vicinity of the end in the main scanning direction.
  4. 　請求項３に記載の画像読取装置において、
    　前記フレーム部材は、前記有機ＥＬ発光体を前記取り付け面において保持する保持部材を備え、
    　前記保持部材が前記カバー部材を兼ねている、画像読取装置。     The image reading apparatus according to claim 3.
    The frame member includes a holding member that holds the organic EL light emitter on the attachment surface,
    The image reading apparatus, wherein the holding member also serves as the cover member.
  5. 　請求項１に記載の画像読取装置において、さらに、
    　前記有機ＥＬ発光体の裏面と前記取り付け面との間に介在される接合部材を備える、画像読取装置。     The image reading apparatus according to claim 1, further comprising:
    An image reading apparatus comprising a bonding member interposed between a back surface of the organic EL light emitter and the mounting surface.
  6. 　請求項１に記載の画像読取装置において、
    　前記有機ＥＬ発光体は可撓性を有し、
    　前記取り付け面は、前記主走査方向と直交する副走査方向の断面において、前記原稿読取面に向けて凹の形状を有する面であり、
    　前記有機ＥＬ発光体は、前記凹の形状に沿って前記取り付け面に取り付けられている、画像読取装置。     The image reading apparatus according to claim 1,
    The organic EL light emitter has flexibility,
    The attachment surface is a surface having a concave shape toward the document reading surface in a cross section in the sub-scanning direction orthogonal to the main scanning direction,
    The organic EL light emitter is attached to the attachment surface along the concave shape.
  7. 　請求項１に記載の画像読取装置において、
    　前記有機ＥＬ発光体は可撓性を有し、
    　前記取り付け面は、前記主走査方向の断面において、前記原稿読取面に対する距離が、前記主走査方向の中央部よりも端部の方が短い凹の形状を有する面であり、
    　前記有機ＥＬ発光体は、前記凹の形状に沿って前記取り付け面に取り付けられている、画像読取装置。     The image reading apparatus according to claim 1,
    The organic EL light emitter has flexibility,
    The attachment surface is a surface having a concave shape in which the distance from the document reading surface in the cross section in the main scanning direction is shorter at the end than at the center in the main scanning direction;
    The organic EL light emitter is attached to the attachment surface along the concave shape.
  8. 　請求項１に記載の画像読取装置において、
    　前記取り付け面は、前記原稿読取面における前記原稿の画像の読み取り位置を挟んで、副走査方向に一対で設けられ、
    　各取り付け面に前記有機ＥＬ発光体がそれぞれ保持されている、画像読取装置。     The image reading apparatus according to claim 1,
    The attachment surfaces are provided in a pair in the sub-scanning direction across the reading position of the image of the document on the document reading surface,
    An image reading apparatus in which the organic EL light emitter is held on each mounting surface.
  9. 　請求項１に記載の画像読取装置において、
    　前記取り付け面は、前記原稿読取面における前記原稿の画像の読み取り位置を挟んで、副走査方向に一対で設けられ、
    　いずれか一方の取り付け面に前記有機ＥＬ発光体が保持され、他方の取り付け面には前記照明光を前記読み取り位置に向かわせる反射体が保持されている、画像読取装置。     The image reading apparatus according to claim 1,
    The attachment surfaces are provided in a pair in the sub-scanning direction across the reading position of the image of the document on the document reading surface,
    The image reading apparatus, wherein the organic EL light emitter is held on one of the mounting surfaces, and a reflector that holds the illumination light toward the reading position is held on the other mounting surface.
  10. 　請求項１に記載の画像読取装置と、
    　前記画像読取装置から出力される画像データに基づいて、シートに画像を形成する画像形成部と、
    を備える画像形成装置。     An image reading apparatus according to claim 1;
    An image forming unit that forms an image on a sheet based on image data output from the image reading device;
    An image forming apparatus comprising:
PCT/JP2015/055692 2014-03-28 2015-02-26 Image reading apparatus and image forming apparatus comprising same WO2015146470A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2014068916 2014-03-28
JP2014-068916 2014-03-28

Publications (1)

Publication Number Publication Date
WO2015146470A1 true WO2015146470A1 (en) 2015-10-01

Family

ID=54195001

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2015/055692 WO2015146470A1 (en) 2014-03-28 2015-02-26 Image reading apparatus and image forming apparatus comprising same

Country Status (1)

Country Link
WO (1) WO2015146470A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2017038110A (en) * 2015-08-07 2017-02-16 三菱電機株式会社 Image sensor

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60181960U (en) * 1984-05-14 1985-12-03 株式会社リコー Illumination unit holding device for image reading device
JP2008141405A (en) * 2006-11-30 2008-06-19 Toshiba Design & Manufacturing Service Corp Image sensor and image forming apparatus
JP2009225035A (en) * 2008-03-14 2009-10-01 Konica Minolta Business Technologies Inc Image reading apparatus and light source
JP2009239434A (en) * 2008-03-26 2009-10-15 Fuji Xerox Co Ltd Lighting device for reading document image, image reading unit, and image forming apparatus

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60181960U (en) * 1984-05-14 1985-12-03 株式会社リコー Illumination unit holding device for image reading device
JP2008141405A (en) * 2006-11-30 2008-06-19 Toshiba Design & Manufacturing Service Corp Image sensor and image forming apparatus
JP2009225035A (en) * 2008-03-14 2009-10-01 Konica Minolta Business Technologies Inc Image reading apparatus and light source
JP2009239434A (en) * 2008-03-26 2009-10-15 Fuji Xerox Co Ltd Lighting device for reading document image, image reading unit, and image forming apparatus

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2017038110A (en) * 2015-08-07 2017-02-16 三菱電機株式会社 Image sensor

Similar Documents

Publication Publication Date Title
JP4633159B2 (en) Illumination apparatus, image reading apparatus, and image forming apparatus
JP5117068B2 (en) Image reading apparatus and image forming apparatus
JP6528989B2 (en) Illuminating device, image reading device and image forming apparatus
JP4530939B2 (en) Image forming apparatus
EP2706743B1 (en) Image reading apparatus and image forminng apparatus having the same
JP5699808B2 (en) Light guide member, document illumination device, image reading device, and image forming device
JP2011176786A (en) Image reader, and image forming apparatus provided with the same
JP5856994B2 (en) Illumination device, and image reading apparatus and image forming apparatus provided with the same
JP4717107B2 (en) Illumination apparatus, image reading apparatus, and image forming apparatus
WO2015146470A1 (en) Image reading apparatus and image forming apparatus comprising same
JP5811595B2 (en) Document illumination device, image reading device, and image forming device
JP5724374B2 (en) Document illumination device, image reading device, and image forming device
JP4928598B2 (en) Line-shaped illumination device and image reading device
JP5622672B2 (en) Image reading apparatus and image forming apparatus having the same
JP2011023869A (en) Image reading apparatus, and image forming apparatus
JP6256307B2 (en) Lighting device
JP2010136348A (en) Linear illumination device, and image reading apparatus employing same
JP2008205843A (en) Image reader and image forming apparatus
JP6205458B2 (en) Image reading apparatus and image forming apparatus
JP6623923B2 (en) Image reading apparatus and image forming apparatus
JP6212916B2 (en) Document illumination device, scanning optical unit, image reading device, and image forming device
JP2016025404A (en) Imaging unit, image reading device, and image forming apparatus
JP5168243B2 (en) Image reading apparatus and image forming apparatus
JP5951565B2 (en) Image reading apparatus and image forming apparatus
JP2015072294A (en) Illumination device, electricity removing device, and image forming apparatus

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 15768399

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE

NENP Non-entry into the national phase

Ref country code: JP

122 Ep: pct application non-entry in european phase

Ref document number: 15768399

Country of ref document: EP

Kind code of ref document: A1