WO2015059997A1 - Dispositif d'éclairage, unité capteur d'image, dispositif d'identification de feuilles de papier, dispositif de lecture d'image, et dispositif de formation d'image - Google Patents

Dispositif d'éclairage, unité capteur d'image, dispositif d'identification de feuilles de papier, dispositif de lecture d'image, et dispositif de formation d'image Download PDF

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Publication number
WO2015059997A1
WO2015059997A1 PCT/JP2014/072146 JP2014072146W WO2015059997A1 WO 2015059997 A1 WO2015059997 A1 WO 2015059997A1 JP 2014072146 W JP2014072146 W JP 2014072146W WO 2015059997 A1 WO2015059997 A1 WO 2015059997A1
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WIPO (PCT)
Prior art keywords
light source
light
image sensor
sensor unit
image
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Application number
PCT/JP2014/072146
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English (en)
Japanese (ja)
Inventor
順矢 木下
Original Assignee
キヤノン・コンポーネンツ株式会社
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Publication date
Application filed by キヤノン・コンポーネンツ株式会社 filed Critical キヤノン・コンポーネンツ株式会社
Priority to JP2014553373A priority Critical patent/JP5813253B2/ja
Publication of WO2015059997A1 publication Critical patent/WO2015059997A1/fr

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    • 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
    • H04N1/0282—Using a single or a few point light sources, e.g. a laser diode
    • H04N1/02835—Using a single or a few point light sources, e.g. a laser diode in combination with a light guide, e.g. optical fibre, glass plate

Definitions

  • the present invention relates to an illumination device, an image sensor unit, a paper sheet identification device, an image reading device, and an image forming device.
  • Patent Document 1 discloses a configuration in which light sources are arranged at both ends in the longitudinal direction of a light guide in an illumination device of an image sensor unit. In such a configuration, light incident surfaces on which light from the light source is incident are formed at both ends of the light guide. And a light source is each arrange
  • Patent Document 2 discloses a white light emitting device including a printed circuit board on which a surface mount type LED package is mounted. And this patent document 2 is disclosing the structure by which this white light-emitting device is connected to the printed circuit board for CIS.
  • the problem to be solved by the present invention is to make the circuit boards arranged at both ends of the light guide common and to reduce the types of components.
  • the illuminating device of the present invention includes two light source modules and a light guide that is formed in a rod shape and whose both end faces in the longitudinal direction are incident surfaces on which light emitted from each of the two light source modules is incident.
  • the light source module includes a light source and a circuit board on which the light source is mounted.
  • the circuit boards of the two light source modules have a common configuration, and the light source is disposed on both surfaces of the circuit board.
  • a terminal for mounting is provided, and the circuit board applied to one of the two light source modules has a light source mounted on one surface, and the other of the two light source modules.
  • the circuit board applied to the light source module is characterized in that a light source is mounted on a surface opposite to the one surface.
  • the circuit boards disposed at both ends of the light guide can be shared, so that the types of components constituting the lighting device can be reduced.
  • FIG. 1 is an exploded perspective view schematically illustrating a configuration example of a lighting device.
  • FIG. 2A is an external perspective view schematically showing a configuration of one light source module (first light source module).
  • FIG. 2B is an external perspective view schematically showing the configuration of the other light source module (second light source module).
  • FIG. 3 is a diagram schematically showing an electrical connection configuration between terminals and LED elements in the LED package.
  • FIG. 4A is a diagram schematically showing the configuration of one surface (A surface) of the light source substrate.
  • FIG. 4B is a diagram schematically showing the configuration of the surface (B surface) on the side opposite to FIG. 4A of the light source substrate.
  • FIG. 5 is a diagram schematically illustrating a wiring configuration of the light source module.
  • FIG. 1 is an exploded perspective view schematically illustrating a configuration example of a lighting device.
  • FIG. 2A is an external perspective view schematically showing a configuration of one light source module (first light source module).
  • FIG. 2B is
  • FIG. 6 is a diagram schematically illustrating an electrical connection configuration between the external connection pad of the light source substrate and the LED module.
  • FIG. 7 is a perspective view schematically showing a configuration example in the vicinity of the end of the illumination device in the main scanning direction.
  • FIG. 8 is an exploded perspective view illustrating a configuration example of the image sensor unit.
  • FIG. 9 is an external perspective view showing a configuration example of the image sensor unit.
  • FIG. 10 is a cross-sectional view schematically showing the internal configuration in the vicinity of the end of the image sensor unit in the main scanning direction.
  • FIG. 11 is a cross-sectional view schematically showing the configuration of the paper sheet identification device.
  • FIG. 12 is a cross-sectional view schematically showing a configuration of a paper sheet identification device having a transmission illumination device.
  • FIG. 13 is a cross-sectional view schematically showing a configuration of a paper sheet identification apparatus having two sets of image sensor units.
  • FIG. 14 is an external perspective view schematically showing the configuration of a flatbed scanner.
  • FIG. 15 is a schematic cross-sectional view illustrating a configuration of a sheet feed type scanner.
  • FIG. 16 is an external perspective view of the image forming apparatus.
  • FIG. 17 is a perspective view showing the image forming unit provided inside the housing of the image forming apparatus.
  • An embodiment of the present invention is an illumination device, an image sensor unit having the illumination device, a paper sheet identification device, an image reading device, and an image forming device having the image sensor unit.
  • three-dimensional directions are indicated by X, Y, and Z arrows.
  • the X direction is the main scanning direction of the image sensor unit to which the illumination device is applied.
  • the Y direction is the sub-scanning direction of the image sensor unit.
  • the Z direction is the vertical direction of the image sensor unit.
  • the side of the object to be illuminated is the upper side.
  • the illuminating device which is embodiment of this invention is integrated and used for an image sensor unit.
  • the image sensor unit irradiates the illuminated body with light by the illumination device while moving relative to the illuminated body in the sub-scanning direction, and reads an image of the illuminated body with the reflected light or transmitted light.
  • light includes not only visible light but also electromagnetic waves in a wavelength band other than visible light such as ultraviolet rays and infrared rays.
  • FIG. 1 is an exploded perspective view schematically showing a configuration example of the illumination device 2.
  • the illuminating device 2 includes a light guide 21 and two light source modules 3a and 3b disposed at both ends of the light guide 21 in the main scanning direction (longitudinal direction). And a light guide cover 22 attached to the light body 21.
  • the light guide 21 is an optical member that linearizes light emitted from the light source modules 3a and 3b.
  • the light guide 21 has a rod-like configuration elongated in the main scanning direction as a whole.
  • the light guide 21 is made of a transparent resin material such as acrylic resin, and is integrally formed by injection molding or the like.
  • Light incident surfaces 211 on which light emitted from the light source modules 3a and 3b is incident are formed on both end surfaces of the light guide 21 in the main scanning direction.
  • a strip-shaped light diffusion surface 212 and a light emission surface 213 that are elongated in the main scanning direction are provided.
  • the light diffusion surface 212 is a surface for diffusing the light incident from the light incident surface 211.
  • a prism-like structure for diffusing light is formed on the light diffusion surface 212.
  • the light diffusion surface 212 may be configured such that a pattern for diffusing light is printed on the surface.
  • the light emitting surface 213 is a surface that emits the light incident from the light incident surface 211 toward the illumination target P.
  • an engaging portion 214 for positioning with the light guide cover 22 is provided at the end of the light guide 21 in the main scanning direction. As the engaging portion 214, for example, a protruding structure projecting in the sub-scanning direction can be applied.
  • the light guide cover 22 has a function of diffusing light and a function of improving light utilization efficiency.
  • the light guide cover 22 has a bar-like configuration elongated in the main scanning direction, and a cross-sectional shape cut along a plane perpendicular to the main scanning direction is formed in a substantially “U” shape.
  • the light guide cover 22 is provided with a light reflecting surface 221.
  • the light reflection surface 221 is a surface for reflecting the light emitted to the outside from the light diffusion surface 212 of the light guide 21 and entering the light guide 21 again.
  • a part or all of the inner surface of the “U” character of the light guide cover 22 is a light reflecting surface 221.
  • the light guide cover 22 is formed of a material having a high light reflectance such as polycarbonate mixed with titanium oxide powder.
  • the light reflecting surface 221 is formed in an elongated strip shape extending in the main scanning direction, like the light diffusing surface 212 of the light guide 21.
  • the light reflecting surface 221 covers the light diffusion surface 212 of the light guide 21 or faces the light diffusion surface 212 of the light guide 21 with the light guide cover 22 attached to the light guide 21. .
  • an engaged portion 222 that engages with the engaging portion 214 of the light guide 21 is provided. If the engaging portion 214 of the light guide 21 is a protrusion protruding in the sub-scanning direction, the engaged portion 222 of the light guide cover 22 is a through-hole penetrating in the sub-scanning direction or a recess recessed in the sub-scanning direction. Applies. Further, positioning portions 223 for positioning light source modules 3a and 3b, which will be described later, are provided on both end surfaces of the light guide cover 22 in the main scanning direction.
  • a protrusion that protrudes outward from the both end faces of the light guide cover 22 toward the main scanning direction is applied.
  • two columnar protrusions are provided as the positioning portion 223 so as to be arranged at a predetermined interval in the sub-scanning direction.
  • 2A and 2B are external perspective views schematically showing the configuration of the two light source modules 3a and 3b.
  • one of the two light source modules is referred to as a first light source module 3a, and the other is referred to as a second light source module 3b.
  • the overall configuration of the two light source modules 3a and 3b is as follows.
  • the two light source modules 3a and 3b include a light source 31 and a light source substrate 32 on which the light source 31 is mounted.
  • the light source substrate 32 is a double-sided wiring type circuit board on which the light source 31 can be mounted on both sides, and has a configuration common to the two light source modules 3a and 3b.
  • 2A and 2B examples of element pads 321a to 321f for mounting the light source 31 and external connection terminals for connecting to the external main circuit board 13 are provided on the surface of the light source substrate 32. External connection pads 322a to 322f are provided.
  • the light source substrate 32 is provided with a wiring pattern 323 and a through hole 324 for connecting predetermined element pads 321a to 321b and predetermined external connection pads 322a to 322f.
  • the light source 31 mounted on the light source substrate 32 emits light by receiving power from outside via the external connection pads 322a to 322f, the wiring patterns 323 and the through holes 324, and the element pads 321a to 321f.
  • a positioning portion 325 for positioning the light guide 21 is formed on the light source substrate 32.
  • a notch 316 is formed near one side of the lower scanning direction of the light source substrate 32. Therefore, the light source substrate 32 is formed in a substantially “L” shape when viewed in the main scanning direction.
  • the first light source module 3a is configured by mounting a light source on a predetermined one side surface of the light source substrate 32
  • the second light source module 3b is configured by mounting a light source on the one side surface opposite to the light source substrate 32. Composed. That is, the two light source modules 3a and 3b are separately formed depending on which one side surface of the light source substrate 32 is mounted with the light source 31.
  • the light source 31 can also have a common configuration for the two light source modules 3a and 3b, but may have a different configuration.
  • a surface mount type LED package is applied to the light source 31.
  • the light source 31 As an example of the light source 31, four LED elements 311R (red (R)), 311G (green (G)), 311B (blue (B)), 311I (infrared (Ir)) (see FIG. 5).
  • a surface mount type LED package having six terminals 312 is shown.
  • a configuration in which a common light source 31 (LED package) is applied to the two light source modules 3a and 3b is shown.
  • FIG. 3 is a table showing electrical connections between the LED elements 311R, 311G, 311B, 311I and the terminals 312 in the light source 31 (LED package) applied to the present embodiment. As shown in FIG.
  • the terminal 312 having the terminal number # 1 is connected to the cathode of the green LED element 311G.
  • Terminal 312 of terminal number # 2 is connected to the cathode of red LED element 311R.
  • Terminal 312 of terminal number # 3 is connected to the anodes of red LED element 311R and infrared LED element 311I.
  • Terminal 312 of terminal number # 4 is connected to the cathode of infrared LED element 311I.
  • Terminal 312 of terminal number # 5 is connected to the cathode of blue LED element 311B.
  • Terminal 312 with terminal number # 6 is connected to the anodes of green LED element 311G and blue LED element 311B.
  • this structure is an example and the light source 31 of this invention is not limited to the LED package of such a structure.
  • a double-sided wiring type circuit board is applied to the light source board 32.
  • a predetermined number of element pads 321a to 321f for connecting each of the terminals 312 of the light source 31 (LED package) are provided on both surfaces of the light source substrate 32. If the LED package having the six terminals 312 is applied to the light source 31, six element pads 321 are provided on both surfaces of the light source substrate 32.
  • the light source board 32 is provided with a predetermined number of external connection pads 322a to 322f for connection to wiring patterns provided on the main circuit board 13 (described later) of the image sensor unit 1. In the present embodiment, the same number of external connection pads 322a to 322f as the terminals 312 of the light source 31 to be mounted are provided.
  • the external connection pads 322a to 322f may be configured to be distributed on both surfaces of the light source substrate 32, or may be configured to be concentrated on only one surface.
  • a configuration is shown in which six external connection pads 322a to 322f are provided separately on each side of the light source substrate 32 by three (ie, half).
  • the light source substrate 32 is provided with wiring patterns 323 and through holes 324 for electrically connecting predetermined element pads 321a to 321f and predetermined external connection pads 322a to 322f.
  • FIGS. 4A and 4B are plan views schematically showing the configuration of the light source substrate 32, and are views showing surfaces opposite to each other.
  • the one side surface shown in FIG. 4A is referred to as “A surface”
  • the one side surface shown in FIG. 4B is referred to as “B surface”.
  • FIG. 4A on the A surface of the light source substrate 32, there are six element pads 321a to 321f (pad numbers # A1 to # A6) and three of the six external connection pads 322a to 322c (pads).
  • Numbers # 1 to # 3 are provided.
  • the six element pads 321a to 321f (pad numbers # B1 to # B6) and the remaining three external connection pads 322d to the B surface, which is the surface opposite to the A surface, are also provided.
  • 322f (pad numbers # 4 to # 6) is provided.
  • the external connection pad 322a with the pad number # 1 on the A side is electrically connected to the element pad 321b with the pad number # A2 on the A side by the wiring pattern 323. Further, it is also electrically connected to the element pad 321b of the pad number # B2 on the B surface through the through hole 324 and the wiring pattern 323.
  • the external connection pad 322b with the pad number # 2 on the A side is electrically connected to the element pad 321c with the pad number # A3 on the A side by the wiring pattern 323. Further, it is also electrically connected to the element pad 321a of the pad number # B1 on the B surface via the through hole 324 and the wiring pattern 323.
  • the external connection pad 322c with the pad number # 3 on the A side is electrically connected to the element pad 321a with the pad number # A1 on the A side by the wiring pattern 323. Further, it is also electrically connected to the element pad 321c of the pad number # B3 on the B surface through the through hole 324 and the wiring pattern 323.
  • the external connection pad 322d with the pad number # 4 on the B surface is electrically connected to the element pad 321d with the pad number # B4 on the B surface by the wiring pattern 323. Further, it is also electrically connected to the element pad 321f of the pad number # A6 on the A surface via the through hole 324 and the wiring pattern 323.
  • the external connection pad 322e with the pad number # 5 on the B surface is electrically connected to the element pad 321e with the pad number # B5 on the B surface by the wiring pattern 323. Further, it is also electrically connected to the element pad 321e of the pad number # A5 on the A side through the through hole 324 and the wiring pattern 323.
  • the external connection pad 322f with the pad number # 6 on the B surface is electrically connected to the element pad 321f with the pad number # B6 on the B surface by the through hole 324 and the wiring pattern 323. Further, it is also electrically connected to the element pad 321d of the pad number # A4 on the A side through the through hole 324 and the wiring pattern 323.
  • the predetermined external connection pads 322a to 322f are electrically connected to the predetermined element pads 321a to 321f on the A and B surfaces.
  • the external connection pads 322a to 322f are shared by the A-side and B-side element pads 321a to 321f.
  • FIG. 5 is a diagram schematically showing a circuit configuration of the light source modules 3a and 3b on which the light source 31 is mounted.
  • FIG. 6 is a table showing an electrical connection configuration between the external connection pads 322a to 322f and the LED elements 311R, 311G, 311B, and 311I of the light source 31.
  • FIG. 5 in order to demonstrate two light source modules 3a and 3b collectively, the structure in case an LED package is mounted in both A surface and B surface is shown.
  • the light source 31 is selectively mounted on one surface of the light source substrate 32.
  • the external connection pads 322a to 322f are shared between the case where the light source 31 is mounted on the A surface and the case where it is mounted on the B surface.
  • element pads 321a to 321f with pad numbers # A1 to # A6 and terminals 312 with terminal numbers # 1 to # 6 are paired in ascending order of pad numbers and terminal numbers. Are connected to correspond to each other.
  • the element pads 321a to 321f with the pad numbers # B1 to # B6 and the terminals 312 with the terminal numbers # 1 to # 6 correspond one-to-one in ascending order of the pad numbers and terminal numbers. Connected to.
  • the electrical connection configuration between the external connection pads 322a to 322f and the terminal 312 is partially different between the A side and the B side.
  • the difference in pin assignment is handled by the wiring pattern provided on the main circuit board 13 of the image sensor unit 1.
  • the external connection pads 322a to 322f can be shared between the case where the light source 31 is mounted on the A surface and the case where the light source 31 is mounted on the B surface.
  • the external connection pad 322a with the terminal number # 1 has a red LED element 311R cathode when the light source 31 is mounted on the A surface and a red electrode when mounted on the B surface. It is shared with the cathode of the LED element 311R.
  • the external connection pad 322b with terminal number # 2 is the anode of the red LED element 311R and the infrared LED element 311I when the light source 31 is mounted on the A surface, and the green LED element when mounted on the B surface. Shared with 311G cathode.
  • the external connection pad 322c with the terminal number # 3 includes the cathode of the green LED element 311G when the light source 31 is mounted on the A surface, and the red LED element 311R and the infrared LED element when mounted on the B surface. Shared with 311I cathode.
  • the external connection pad 322d with the terminal number # 4 includes the anodes of the green LED element 311G and the blue LED element 311B when the light source 31 is mounted on the A surface, and the infrared LED element when mounted on the B surface. Shared with 311I cathode.
  • the external connection pad 322e of terminal number # 5 is shared by the cathode of the blue LED element 311B when the light source 31 is mounted on the A surface and the cathode of the blue LED element 311B when mounted on the B surface. Is done.
  • the external connection pad 322f with the terminal number # 6 is a cathode of the infrared LED element 311I when the light source 31 is mounted on the A surface, and a green LED element 311G and a blue LED element when mounted on the B surface. Shared with 311B anode.
  • the said structure is an example of a common structure, and is not limited to this structure.
  • the light source substrate 32 is provided with a positioning portion 325 for positioning the light guide cover 22.
  • a configuration in which a through hole 325b and a notch 325a into which the positioning part 223 of the light guide cover 22 is fitted is applied as the positioning part 325 (FIGS. 2A, 2B, 4A, and 4B). reference).
  • the through hole 325b is provided closer to one side in the sub-scanning direction when viewed in the main scanning direction, and the notch 325a is provided closer to one side opposite to the sub-scanning direction.
  • the positioning portion 223 of the light guide cover 22 can be fitted into each of the through hole 325b and the notch portion 325a which are the positioning portions 325 of the light source substrate 32. Then, in the fitted state, the light source 31 is positioned at a position where light is irradiated toward the light incident surface 211 of the light guide 21 (a position facing the light incident surface 211 of the light guide 21).
  • the 1st light source module 3a is comprised by mounting the light source 31 on the predetermined
  • the 2nd light source module 3b is comprised by mounting the light source 31 on the one side surface (for example, B surface) of an other side.
  • a double-sided wiring type circuit board is applied to the light source board 32, and an LED package as the light source 31 is selectively mounted on one of the surfaces of one side.
  • the first light source module 3a and the second light source module 3b can be made separately by the common light source substrate 32. Therefore, the light source substrate 32 can be shared by the two light source modules 3a and 3b. For this reason, reduction of the component cost of the illuminating device 2 can be aimed at.
  • FIG. 7 is a perspective view schematically showing a state in which the light guide cover 22 is attached to the light guide 21, and is a view showing the vicinity of the end in the main scanning direction.
  • a light guide cover 22 is attached to the light guide 21.
  • the light guide cover 22 is positioned on the light guide 21 by engaging the engaging portion 214 of the light guide 21 with the engaged portion 222 of the light guide cover 22 (see FIG. 1). .
  • the light diffusion surface 212 of the light guide body 21 and the light reflection surface 221 of the light guide body cover 22 face each other (or contact).
  • each of the two light source modules 3a and 3b is arranged so that light can be applied to each of the light incident surfaces 211 at both ends of the light guide 21 in the main scanning direction.
  • the positioning portion 223 of the light guide cover 22 is fitted into each of the through hole 325 b and the notch portion 325 a which are the positioning portions 325 of the light source substrate 32.
  • the LED package as the light source 31 of the light source modules 3a and 3b and the light incident surface 211 of the light guide 21 are positioned.
  • FIG. 8 is an exploded perspective view schematically showing a configuration example of the image sensor unit 1.
  • FIG. 9 is an external perspective view showing a configuration example of the image sensor unit 1.
  • FIG. 10 is a cross-sectional view schematically showing an internal configuration example in the vicinity of the end portion in the main scanning direction of the image sensor unit 1.
  • the image sensor unit 1 reads the object to be illuminated P by irradiating the object to be illuminated P with the illumination device 2 and detecting the light from the object to be illuminated P.
  • the image sensor unit 1 as a whole has a rod-like configuration that is long in the main scanning direction.
  • the image sensor unit 1 includes a lighting device 2, a frame 10, a cover member 11, a light collector 12, and a main circuit board 13.
  • An image sensor 14 is provided on the upper surface of the main circuit board 13.
  • a connector 15 for electrically connecting to the outside is mounted on the lower surface of the main circuit board 13.
  • the connector 15 mounted on the lower surface of the main circuit board 13 can connect the image sensor unit 1 to a predetermined device (for example, a circuit board) such as a paper sheet identification device 5 so as to be able to transmit and receive power and electric signals.
  • a predetermined device for example, a circuit board
  • a paper sheet identification device 5 so as to be able to transmit and receive power and electric signals. Any specific configuration may be used, and the specific configuration is not limited.
  • the frame 10 is a housing of the image sensor unit 1.
  • the frame 10 is formed of a resin material that is colored black and has a light shielding property.
  • polycarbonate can be used as the resin material.
  • the frame 10 has a rectangular shape that is long in the main scanning direction when viewed from above.
  • a light guide housing chamber 101 capable of housing the light guide 21 to which the light guide cover 22 is attached
  • a light collector housing chamber 103 capable of housing the light collector 12 are formed.
  • the A circuit board housing chamber 104 capable of housing the main circuit board 13 is formed below the frame 10 (see FIG. 10).
  • the light collector housing chamber 103 and the circuit board housing chamber 104 are connected by an opening through which light can pass.
  • light source accommodation chambers 102 that can accommodate the two light source modules 3a and 3b are formed at both ends of the frame 10 in the main scanning direction.
  • screw holes 105 for attaching the image sensor unit 1 to other devices are formed on both end faces of the frame 10 in the main scanning direction.
  • the screw holes 105 are formed below both end faces in the main scanning direction and in the vicinity of both end parts in the sub scanning direction.
  • the cover member 11 is disposed so as to cover the upper side of the frame 10.
  • the cover member 11 is a transparent, rectangular plate-like member that is long in the main scanning direction when viewed from above.
  • the cover member 11 has a function of protecting the light guide body 21 and the light collector 12 and a function of maintaining a flat surface in contact with the body P to be illuminated.
  • the cover member 11 may not be provided.
  • the cover member 11 is provided.
  • the cover member 11 can be a member in which a hard coat is applied to the surface of a transparent resin material such as glass or acrylic or polycarbonate so as to have a strength equivalent to that of glass.
  • the condenser 12 is an optical member that forms an image of light from the illuminated object P on the surface of an image sensor 14 (described later).
  • a rod lens array is applied to the light collector 12.
  • a general rod lens array has a configuration in which a plurality of erecting equal-magnification imaging type imaging elements (rod lenses) are linearly arranged in the main scanning direction.
  • the light collector 12 may have any configuration as long as the imaging elements are arranged linearly, and the specific configuration is not limited.
  • the light collector 12 may have a configuration in which a plurality of rows of imaging elements are arranged.
  • Various known optical members having a condensing function such as various known microlens arrays, can be applied to the light collector 12.
  • the main circuit board 13 is a circuit board having a rectangular configuration that is long in the main scanning direction.
  • an image sensor 14 is mounted and two light source modules 3a and 3b are attached.
  • long holes 131 into which the light source modules 3a and 3b can be fitted are formed at both ends of the main circuit board 13 in the main scanning direction. These long holes 131 penetrate vertically and extend in the sub-scanning direction.
  • the light source substrates 32 of the two light source modules 3a and 3b are fitted into the respective long holes 131, and pads (external connection pads 322 of the light source substrate 32 and pads of a predetermined wiring pattern provided on the main circuit board 13 ( Are connected by soldering.
  • the external connection pads 322a to 322f provided on the light source board 32 of the two light source modules 3a and 3b and the predetermined terminals of the connector 15 mounted on the lower surface of the main circuit board 13 are connected to the main circuit board 13. It is electrically connected by the wiring pattern provided. As described above, the difference in pin assignment between the two light source modules 3 a and 3 b corresponds to the wiring pattern provided on the main circuit board 13.
  • the image sensor 14 converts the light imaged by the light collector 12 into an electrical signal.
  • the image sensor 14 is mounted with the light receiving surface facing upward so that the light from the light collector 12 can be received.
  • an image sensor IC array is applied to the image sensor 14.
  • the image sensor IC array is configured by mounting a plurality of image sensor ICs on the surface of the main circuit board 13 so as to be linearly arranged in the main scanning direction.
  • the image sensor IC includes a plurality of light receiving elements (sometimes referred to as photoelectric conversion elements) corresponding to the reading resolution of the image sensor unit 1.
  • the image sensor 14 is configured by arranging a plurality of image sensor ICs in a straight line in the main scanning direction.
  • the image sensor 14 only needs to have a configuration in which a plurality of image sensor ICs are linearly arranged, and other configurations are not particularly limited.
  • the image sensor ICs may be arranged in a plurality of rows like a staggered arrangement.
  • various well-known image sensor ICs can be applied to the image sensor IC constituting the image sensor IC array as the image sensor 14.
  • the assembly structure of the image sensor unit 1 is as follows.
  • the two light source modules 3a and 3b are housed in the light source housing chamber 102 of the frame 10, respectively.
  • the lower portions of the two light source modules 3a and 3b are fitted into elongated holes 131 formed in the main circuit board 13, and external connection pads 322a to 322f of the light source board 32 are predetermined wirings provided on the main circuit board 13. Soldered to pattern pad.
  • each LED element 311R, 311G, 311B, 311I of the light source 31 will be in the state which can receive electric power feeding through the main circuit board 13.
  • FIG. A cover member 11 is attached to the upper side of the frame 10.
  • the protrusions that are the positioning portions 223 of the light guide cover 22 are the through holes 325 b and the notches 325 a that are the positioning portions 325 of the light source substrate 32 of the light source modules 3 a and 3 b.
  • the light sources 31 of the two light source modules 3 a and 3 b are positioned so as to face the light incident surfaces 211 provided on both end surfaces of the light guide 21. For this reason, the light emitted from the two light source modules 3 a and 3 b is incident on the light incident surface 211 of the light guide 21.
  • the two light source modules 3a and 3b sequentially turn on the LED elements 311R, 311G, 311B, and 311I of the respective colors and infrared rays in synchronization.
  • Light emitted from the two light source modules 3a and 3b is incident on the light incident surface 211 of the light guide 21 and propagates in the light diffusion surface 212, for example. Then, the light is emitted from the light emitting surface 213 of the light guide 21 toward the reading line O of the illumination target P.
  • the condenser 12 and the image sensor 14 face each other with a predetermined interval.
  • the reflected light from the reading line O of the illumination object P is imaged on the surface of the image sensor 14 by the condenser 12.
  • the image sensor 14 converts the optical image formed by the light collector 12 into an electrical signal.
  • the image sensor unit 1 periodically repeats the operation of irradiating the illuminated object P with light and detecting the reflected light in a short time.
  • the image sensor unit 1 reads a predetermined pattern (for example, a hologram) provided on the illuminated object P as a visible light image and reads the illuminated object P as an infrared image.
  • a predetermined pattern for example, a hologram
  • the frame 10 which is a casing of the image sensor unit 1 is attached to other devices such as a paper sheet identification device 5 and image reading devices (scanners 7a and 7b) by screws.
  • screw holes 105 for attachment are formed on both end faces of the frame 10 in the main scanning direction.
  • these screw holes 105 are formed in the vicinity of both ends in the sub-scanning direction and in the vicinity of the bottom of both end faces in the main scanning direction.
  • a thick part protrudes inside the frame 10 (particularly, the light source housing chamber 102) at a position corresponding to the screw hole 105 (specifically, at the lower part of the four corners).
  • the light guide 21 and the light collector 12 are arranged side by side in the sub-scanning direction, the light guide 21 and the two light source modules 3a and 3b are biased toward one side in the sub-scanning direction. It is arranged. For this reason, the lower side of the light source substrate 32 closer to one side in the sub-scanning direction approaches the four corners of the frame 10. Therefore, in the light source substrate 32 of the light source modules 3a and 3b of the present embodiment, a cutout portion 316 is formed near one side of the lower sub-scanning direction in order to avoid interference with the thick portion corresponding to the screw hole 105.
  • each light source substrate 32 has a left-right asymmetric shape when viewed in the vertical direction (viewed in the main scanning direction) from the surface side where the light source 31 is mounted. More specifically, the light source substrate 32 is formed in a substantially “L” shape as a whole when viewed in the main scanning direction. The notch 325a is formed closer to one side in the sub-scanning direction when viewed in the main scanning direction.
  • the light source substrate 32 cannot be shared. That is, the two light source modules 3a and 3b are arranged so that the surfaces on which the light source 31 is mounted face each other with the light guide 21 interposed therebetween. For this reason, when the two light source modules 3a and 3b are respectively viewed from the side where the light source 31 is mounted, the notch 316 is positioned on the left and right opposite sides of the two light source modules 3a and 3b. Accordingly, in a configuration in which a single-sided circuit board is applied to the light source board 32 of the two light source modules 3a and 3b, the light source board 32 must be axisymmetric (laterally symmetric). Cannot be configured.
  • the light source substrate 32 can be shared by the two light source modules 3a and 3b. That is, the first light source module 3 a is configured by mounting the light source 31 on a predetermined one-side surface (for example, A surface) of the light source substrate 32.
  • the second light source module 3b is configured by mounting the light source 31 on the other one-side surface (for example, B surface) of the light source substrate 32.
  • the light source 31 is mounted on the opposite surface of the light source substrate 32 by the two light source modules 3a and 3b.
  • the two light source modules 3a and 3b are symmetric when viewed from the side where the light source 31 is mounted (see FIGS. 2A, 2B, 4A, and 4B). Therefore, the light source substrate 32 can be shared by the two light source modules 3a and 3b.
  • the dimension of the light source substrate 32 in the sub-scanning direction differs between the upper part and the lower part.
  • element pads 321a to 321f for mounting the light source 31 are provided in a portion having a large upper dimension.
  • external connection pads 322a to 322f for connection to the main circuit board 13 are provided in a portion having a small lower dimension.
  • the positioning portion 325 is provided in the vicinity of the boundary between a portion having a large upper dimension and a portion having a smaller lower dimension.
  • this invention is not limited to such a structure.
  • the structure which avoids interference with structures and members other than such a thick part may be sufficient.
  • the present invention can be applied to a configuration in which the shape of the light source substrate 32 is different between the two light source modules 3a and 3b (particularly, a configuration that is line symmetric). In such a case, the light source substrate 32 can be easily shared.
  • FIG. 11 is a cross-sectional view schematically showing the configuration of the paper sheet identification device 5 and is a cross-sectional view taken along a plane perpendicular to the main scanning direction.
  • the paper sheet identification device 5 irradiates a bill or the like that is the object P to be illuminated with light, reads light from the bill, and identifies the type or authenticity of the bill using the read light.
  • the paper sheet identification device 5 includes an image sensor unit 1, a conveyance roller 51 that conveys banknotes, and an image identification unit 52 as identification means connected to the connector 15 by wiring.
  • a conveyance path A for conveying the image sensor unit 1 in the reading direction (sub-scanning direction) via the cover member 11 with the banknotes sandwiched by the conveyance roller 51 is set.
  • the focal point on the banknote side of the condenser 12 is set at the center of the transport path A.
  • the operation of the paper sheet identification device 5 having such a configuration is as follows.
  • the image sensor unit 1 applied to the paper sheet identification device 5 reads the predetermined pattern provided on the banknote as a visible light image and reads the banknote as an infrared image by the above-described operation.
  • the image identification part 52 is a genuine note banknote image obtained by irradiating a bill which is a genuine note prepared in advance with visible light and infrared rays, and a visible light image and red of a bill to be determined at the time of authenticity determination.
  • the authenticity of the banknote is determined by comparing the outside image. This is because bills that are genuine bills are provided with regions in which images obtained from visible light and infrared light are different from each other.
  • the image identification unit 52 may be provided on the main circuit board 13.
  • FIG. 12 is a cross-sectional view schematically showing the configuration of the paper sheet identification device 5 further including the transmission illumination device 53.
  • the transmitted illumination device 53 includes a light source module 531 and a light guide 532. The same configuration as that of the light source modules 3 a and 3 b and the light guide 21 described above is applied to the light source module 531 and the light guide 532 of the transmissive illumination device 53.
  • the transmitted illumination device 53 is provided at a position facing the image sensor unit 1 so that light can be emitted toward the banknote.
  • the transmissive illumination device 53 is disposed so that the optical axis of light emitted from the exit surface of the light guide 532 coincides with the optical axis of the light collector 12 of the image sensor unit 1.
  • the operation of the paper sheet identification device 5 having such a configuration is as follows.
  • the light source modules 3a and 3b incorporated in the image sensor unit 1 and the light source module 531 of the transmissive illumination device 53 sequentially turn on the visible and infrared LED elements of each color.
  • the light irradiated to the banknote from the light guide 21 of the illumination device 2 of the image sensor unit 1 is reflected by the surface of the banknote, enters the light collector 12, and forms an image on the surface of the image sensor 14.
  • the image sensor 14 acquires a visible light image and an infrared image by reflected light from a banknote by converting the formed optical image into an electrical signal.
  • the light irradiated on the banknote from the transmission illumination device 53 passes through the banknote and enters the light collector 12 of the image sensor unit 1, and forms an image on the surface of the image sensor 14.
  • the image sensor 14 obtains a visible light image and an infrared image by transmitted light from a banknote by converting the formed optical image into an electrical signal.
  • the illumination device 2 and the transmission illumination device 53 of the image sensor unit 1 alternately repeat the operation of irradiating the bill with light and detecting the reflected light and the transmitted light in a short time.
  • the image sensor unit 1 reads a predetermined pattern (for example, a hologram) provided on the banknote as a visible light image and reads the banknote as an infrared image.
  • the paper sheet identification device 5 can read a visible light image and an infrared image by reflected light and transmitted light of a bill.
  • FIG. 13 is a cross-sectional view schematically showing the configuration of a paper sheet identification device 5 having two sets of image sensor units 1. As shown in FIG. 13, the two sets of image sensor units 1 are disposed so as to face each other with the conveyance path A for banknotes interposed therebetween. The two sets of image sensor units 1 are arranged so that light irradiated from the light guide 21 of one image sensor unit 1 and transmitted through the banknote enters the light collector 12 of the other image sensor unit 1. Established.
  • the operation of the paper sheet identification device 5 having such a configuration is as follows.
  • the light source modules 3a and 3b of the illumination device 2 incorporated in the two sets of image sensor units 1 sequentially turn on the visible light and infrared LED elements of each color.
  • the light irradiated on the banknote from the illumination device 2 of the one image sensor unit 1 is reflected by the surface of the banknote and is incident on the light collecting body 12 of the one image sensor unit 1.
  • 14 is imaged.
  • the image sensor 14 of one image sensor unit 1 acquires a visible light image and an infrared image by reflected light from a banknote by converting the formed optical image into an electrical signal.
  • the light irradiated to the banknote from the illuminating device 2 of one image sensor unit 1 passes through the banknote and enters the light collecting body 12 of the other image sensor unit 1, and the image sensor of the other image sensor unit 1. 14 is imaged.
  • the image sensor 14 of the other image sensor unit 1 acquires a visible light image and an infrared image by transmitted light from a banknote by converting the formed optical image into an electrical signal.
  • the paper sheet identification device 5 can read the reflection image on both sides of the banknote and can read the transmission image.
  • the structure which reads a banknote as a visible light image and an infrared image by irradiating visible light and infrared rays was shown, it is not limited to this structure. For example, it may be configured to irradiate ultraviolet rays.
  • the structure to which a banknote is applied as the to-be-illuminated body P was shown, the kind of paper sheet is not limited. For example, various securities and ID cards can be applied.
  • FIG. 14 is a perspective view showing a configuration of a flatbed scanner 7a as an image reading apparatus to which the image sensor unit 1 according to the embodiment of the present invention can be applied.
  • the scanner 7 a includes a housing 71 a, a platen glass 72 as an illuminated body placement unit, the image sensor unit 1, a drive mechanism that drives the image sensor unit 1, a circuit board 73 a, and a platen cover 74.
  • the platen glass 72 as the illumination object mounting portion is made of a transparent plate such as glass and is attached to the upper surface of the housing 71a.
  • the platen cover 74 is attached to the casing 71a so as to be openable and closable via a hinge mechanism or the like so as to cover the illuminated object P placed on the platen glass 72.
  • the image sensor unit 1, the drive mechanism for driving the image sensor unit 1, and the circuit board 73a are accommodated in the housing 71a.
  • the drive mechanism includes a holding member 750, a guide shaft 751, a drive motor 752, and a wire 754.
  • the holding member 750 holds the image sensor unit 1 so as to surround it.
  • the guide shaft 751 guides the holding member 750 so as to be movable along the platen glass 72 in the reading direction (sub-scanning direction).
  • the drive motor 752 and the holding member 750 are connected via a wire 754, and the holding member 750 that holds the image sensor unit 1 is moved in the sub-scanning direction by the driving force of the drive motor 752.
  • the image sensor unit 1 reads a document or the like that is the object P placed on the platen glass 72 while moving in the sub-scanning direction by the driving force of the driving motor 752.
  • the to-be-illuminated body P is read, moving the image sensor unit 1 and the to-be-illuminated body P relatively.
  • the circuit board 73a has an image processing circuit that performs predetermined image processing on the image read by the image sensor unit 1, a control circuit that controls each part of the scanner 7a including the image sensor unit 1, and power to each part of the scanner 7a.
  • a power supply circuit to be supplied is constructed.
  • FIG. 15 is a schematic cross-sectional view showing a configuration of a sheet feed type scanner 7b as an image reading apparatus to which the image sensor unit 1 according to the embodiment of the present invention can be applied.
  • the scanner 7 b includes a housing 71 b, the image sensor unit 1, a transport roller 76, a circuit board 73 b, and a cover glass 77.
  • the conveyance roller 76 is rotated by a driving mechanism (not shown) and conveys the object P to be illuminated.
  • the cover glass 77 is provided so as to cover the upper side of the image sensor unit 1.
  • On the circuit board 73b a control circuit that controls each part of the scanner 7b including the image sensor unit 1, a power supply circuit that supplies power to each part of the scanner 7b, and the like are constructed.
  • the scanner 7b reads the object to be illuminated P by the image sensor unit 1 while conveying the object to be illuminated P in the reading direction (sub-scanning direction) by the conveying roller 76. That is, the object to be illuminated P is read while relatively moving the image sensor unit 1 and the object to be illuminated P.
  • FIG. 15 shows an example of the scanner 7b that reads one side of the illuminated object P, but the two image sensor units 1 are provided so as to face each other with the conveyance path A of the illuminated object interposed therebetween, and the illuminated object The structure which reads both surfaces of P may be sufficient.
  • the scanners 7a and 7b have been described as examples of the image reading apparatus using the image sensor unit 1 to which the present invention can be applied with reference to FIGS.
  • the configuration and type are not limited to these.
  • FIG. 16 is an external perspective view of the image forming apparatus 9 according to the embodiment of the present invention.
  • FIG. 17 is a perspective view showing an extracted image forming unit 92 provided in the housing 91 of the image forming apparatus 9 according to the embodiment of the present invention.
  • the image forming apparatus 9 is a multi function printer (MFP) including a flat bed type scanner and an ink jet type printer.
  • MFP multi function printer
  • the image forming apparatus 9 includes an image reading unit 93 as an image reading unit that reads an image, and an image forming unit 92 as an image forming unit that forms an image.
  • the image sensor unit 1 is incorporated in the image reading unit 93 of the image forming apparatus 9. Note that the image reading unit 93 of the image forming apparatus 9 can be configured in common with the above-described image reading apparatus. Therefore, the description of the configuration common to the image reading apparatus is omitted.
  • the image forming apparatus 9 is provided with an operation unit 94.
  • the operation unit 94 includes a display unit 941 that displays an operation menu and various messages, and various operation buttons 942 for operating the image forming apparatus 9.
  • an image forming unit 92 is provided inside the housing 91 of the image forming apparatus 9.
  • the image forming unit 92 includes a conveyance roller 921, a guide shaft 922, an ink jet cartridge 923, a motor 926, and a pair of timing pulleys 927.
  • the conveyance roller 921 is rotated by the driving force of the driving source, and conveys the printing paper R as a recording medium in the sub scanning direction.
  • the guide shaft 922 is a rod-shaped member, and is fixed to the housing 91 of the image forming apparatus 9 so that the axis thereof is parallel to the main scanning direction of the printing paper R.
  • the inkjet cartridge 923 can reciprocate in the main scanning direction of the printing paper R by sliding on the guide shaft 922.
  • the ink jet cartridge 923 includes, for example, ink tanks 924 (924C, 924M, 924Y, 924K) having inks of cyan C, magenta M, yellow Y, and black K, and ejection heads 925 provided in these ink tanks 924, respectively. (925C, 925M, 925Y, 925K).
  • One of the pair of timing pulleys 927 is attached to the rotating shaft of the motor 926.
  • the pair of timing pulleys 927 are provided at positions separated from each other in the main scanning direction of the printing paper R.
  • the timing belt 928 is wound around the pair of timing pulleys 927 in parallel, and a predetermined portion is connected to the ink jet cartridge 923.
  • the image reading unit 93 of the image forming apparatus 9 converts the image read by the image sensor unit 1 into an electrical signal in a format suitable for printing. Then, the image forming unit 92 of the image forming apparatus 9 drives the transport roller 921, the motor 926, and the ink jet cartridge 923 based on the electrical signal converted by the image sensor unit 1 of the image reading unit 93, and the image is printed on the printing paper R. Form. In addition, the image forming unit 92 of the image forming apparatus 9 can form an image based on an electrical signal input from the outside. In the image forming apparatus 9, the configuration and operation of the image forming unit 92 can be the same as those of various conventionally known printers. Therefore, detailed description is omitted. Although an image forming apparatus using an ink jet method has been described as the image forming unit 92, any method such as an electrophotographic method, a thermal transfer method, or a dot impact method may be used.
  • the image reading apparatus is not limited to the image scanner having the configuration described in the above embodiment.
  • the image forming apparatus is not limited to the ink jet system, and may be any system such as an electrophotographic system, a thermal transfer system, and a dot impact system, and is limited to the multifunction device described in the above embodiment. is not.
  • a copying machine or a facsimile to which the image sensor unit according to the present invention is applied is also included in the image reading apparatus of the present invention.
  • the illumination device 2 including the light source and the light guide 21 is used as a light source for reflection with respect to the original P, it may be used as a light source for transmission.
  • the present invention relates to an illuminating device, an image sensor unit to which the illuminating device is applied, and an image reading apparatus and an image forming apparatus to which the image sensor unit is applied (for example, an image scanner, a facsimile machine, a copier, a multifunction machine, etc.). It can be used effectively.

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  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Facsimile Scanning Arrangements (AREA)
  • Facsimile Heads (AREA)
  • Light Sources And Details Of Projection-Printing Devices (AREA)
  • Inspection Of Paper Currency And Valuable Securities (AREA)

Abstract

L'invention concerne un dispositif d'éclairage (2), comprenant : deux modules de source lumineuse (3a, 3b) ; et un corps de guide de lumière (21) ayant la forme d'une tige pourvue de faces d'entrée de lumière (211) sur ses deux faces d'extrémité dans le sens de la longueur, dans lesquelles pénètre une lumière émise respectivement par les deux modules de source lumineuse (3a, 3b). Les deux modules de source lumineuse (3a 3b) comprennent également des sources lumineuses (31), et des substrats de sources lumineuses (32) sur lesquels sont montées les sources lumineuses (31). Les substrats de sources lumineuses (32) des deux modules de source lumineuse (3a, 3b) ont la même configuration.
PCT/JP2014/072146 2013-10-24 2014-08-25 Dispositif d'éclairage, unité capteur d'image, dispositif d'identification de feuilles de papier, dispositif de lecture d'image, et dispositif de formation d'image WO2015059997A1 (fr)

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JP2017112454A (ja) * 2015-12-15 2017-06-22 コニカミノルタ株式会社 画像読取装置および画像形成システム

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JPH10216084A (ja) * 1997-02-10 1998-08-18 Fuji Photo Optical Co Ltd 内視鏡用撮像装置
JP2008147847A (ja) * 2006-12-07 2008-06-26 Rohm Co Ltd 線状光源装置および画像読み取り装置

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JPH06261175A (ja) * 1993-03-08 1994-09-16 Canon Inc 回路基板、原稿読取装置、及び情報処理装置
JPH10216084A (ja) * 1997-02-10 1998-08-18 Fuji Photo Optical Co Ltd 内視鏡用撮像装置
JP2008147847A (ja) * 2006-12-07 2008-06-26 Rohm Co Ltd 線状光源装置および画像読み取り装置

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JP2017112454A (ja) * 2015-12-15 2017-06-22 コニカミノルタ株式会社 画像読取装置および画像形成システム
CN107018265A (zh) * 2015-12-15 2017-08-04 柯尼卡美能达株式会社 图像读取装置以及图像形成系统
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CN107018265B (zh) * 2015-12-15 2019-06-18 柯尼卡美能达株式会社 图像读取装置以及图像形成系统

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