WO2022260102A1 - 光学部材および画像読取装置 - Google Patents

光学部材および画像読取装置 Download PDF

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Publication number
WO2022260102A1
WO2022260102A1 PCT/JP2022/023184 JP2022023184W WO2022260102A1 WO 2022260102 A1 WO2022260102 A1 WO 2022260102A1 JP 2022023184 W JP2022023184 W JP 2022023184W WO 2022260102 A1 WO2022260102 A1 WO 2022260102A1
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WO
WIPO (PCT)
Prior art keywords
lens
lens body
optical
light
transmissive
Prior art date
Legal status (The legal status 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 status listed.)
Ceased
Application number
PCT/JP2022/023184
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English (en)
French (fr)
Japanese (ja)
Inventor
秀樹 松井
陽平 野上
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mitsubishi Electric Corp
Original Assignee
Mitsubishi Electric Corp
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 Mitsubishi Electric Corp filed Critical Mitsubishi Electric Corp
Priority to CN202280039667.5A priority Critical patent/CN117413509A/zh
Priority to DE112022002971.4T priority patent/DE112022002971T5/de
Priority to US18/566,754 priority patent/US12105303B2/en
Priority to JP2022572298A priority patent/JP7337292B2/ja
Publication of WO2022260102A1 publication Critical patent/WO2022260102A1/ja
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B3/00—Simple or compound lenses
    • G02B3/0006—Arrays
    • G02B3/0037—Arrays characterized by the distribution or form of lenses
    • G02B3/0062—Stacked lens arrays, i.e. refractive surfaces arranged in at least two planes, without structurally separate optical elements in-between
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B3/00—Simple or compound lenses
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B3/00—Simple or compound lenses
    • G02B3/0006—Arrays
    • G02B3/0037—Arrays characterized by the distribution or form of lenses
    • G02B3/0056—Arrays characterized by the distribution or form of lenses arranged along two different directions in a plane, e.g. honeycomb arrangement of lenses
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • 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
    • 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
    • H04N1/03—Details of scanning heads ; Means for illuminating the original for picture information pick-up with photodetectors arranged in a substantially linear array
    • 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
    • H04N1/03—Details of scanning heads ; Means for illuminating the original for picture information pick-up with photodetectors arranged in a substantially linear array
    • H04N1/0306—Details of scanning heads ; Means for illuminating the original for picture information pick-up with photodetectors arranged in a substantially linear array using a plurality of optical elements arrayed in the main scan direction, e.g. an array of lenses
    • 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
    • H04N1/03—Details of scanning heads ; Means for illuminating the original for picture information pick-up with photodetectors arranged in a substantially linear array
    • H04N1/031—Details of scanning heads ; Means for illuminating the original for picture information pick-up with photodetectors arranged in a substantially linear array the photodetectors having a one-to-one and optically positive correspondence with the scanned picture elements, e.g. linear contact sensors
    • H04N1/0318—Integral pick-up heads, i.e. self-contained heads whose basic elements are a light-source, a lens array and a photodetector array which are supported by a single-piece frame
    • 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
    • H04N1/04—Scanning arrangements, i.e. arrangements for the displacement of active reading or reproducing elements relative to the original or reproducing medium, or vice versa
    • H04N1/19—Scanning arrangements, i.e. arrangements for the displacement of active reading or reproducing elements relative to the original or reproducing medium, or vice versa using multi-element arrays
    • H04N1/191—Scanning arrangements, i.e. arrangements for the displacement of active reading or reproducing elements relative to the original or reproducing medium, or vice versa using multi-element arrays the array comprising a one-dimensional array, or a combination of one-dimensional arrays, or a substantially one-dimensional array, e.g. an array of staggered elements
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B3/00—Simple or compound lenses
    • G02B2003/0093—Simple or compound lenses characterised by the shape
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N2201/00—Indexing scheme relating to scanning, transmission or reproduction of documents or the like, and to details thereof
    • H04N2201/0077—Types of the still picture apparatus
    • H04N2201/0081—Image reader

Definitions

  • the present disclosure relates to an optical member and an image reading device.
  • the image reading device irradiates an object to be read with light, converges transmitted light or reflected light from the object to be read by a plurality of lens bodies arranged in an array, and includes a plurality of optical sensors arranged in a line. There is something that can be read by the device.
  • An example of this type of image reading apparatus is disclosed in Patent Documents 1 and 2.
  • a lens array of an erect equal-magnification optical system specifically a rod lens array or a microlens array having a plurality of cylindrical lens bodies is used.
  • the image reading devices disclosed in Patent Documents 1 and 2 are provided with overlap limiting members provided between the lens elements. By limiting the overlap of images by the plurality of lens elements with the overlap limiting member, it is possible to control the imaging diameter of each lens element and expand the depth of field.
  • the image reading device disclosed in Patent Document 2 includes a light-transmitting cylindrical array having a plurality of light-transmitting cylindrical portions.
  • the light-transmitting cylindrical portion is arranged between the lens array and the sensor element array for each optical axis of the lens body, and emits light incident on one end face of the lens body toward the sensor element from the other end face.
  • the image reading device disclosed in Patent Document 2 includes lens bodies that are in contact with each other, and light-transmitting cylindrical portions that are provided for each lens body and are in contact with each other.
  • the optical axis of the lens body deviates from the center axis of the light-transmitting cylindrical portion, the light emitted from the lens body enters the light-transmitting cylindrical portion adjacent to the light-transmitting cylindrical portion corresponding to the lens body.
  • images formed by adjacent lens bodies may overlap.
  • An object of the present invention is to provide an optical member and an image reading device in which overlapping of images formed by a lens body is suppressed.
  • An optical member includes a lens array and a plurality of transmissive members.
  • the lens array has a plurality of lens bodies that are arranged in a row in the main scanning direction and converge the light from the object to be read.
  • the plurality of transmissive members is formed of a member having a uniform refractive index, and is provided at a position closer to the object to be read than the corresponding lens body or at a position farther from the object to be read than the lens body. It has a columnar shape extending along the , and allows light incident from one end face to emerge from the other end face. At least one of the plurality of lens bodies and the plurality of transmission members are arranged with a spacing therebetween that is greater than the alignment error of the plurality of lens bodies and the plurality of transmission members.
  • An optical member includes a plurality of lens bodies and a plurality of transmissive members corresponding to the respective lens bodies and allowing light incident from one end surface to exit from the other end surface.
  • overlapping of images formed by lens bodies adjacent in the main scanning direction is suppressed.
  • At least one of the plurality of lens bodies and the plurality of transmission members is arranged with a spacing larger than the arrangement error of the plurality of lens bodies and the plurality of transmission members. It is possible to obtain an optical member in which overlapping of images formed by the lens body is suppressed even if an error occurs in any of the array positions.
  • FIG. 1 is a perspective view of a transmissive member according to Embodiment 1.
  • FIG. 4 is a diagram showing the positional relationship between the optical member and the sensor array according to Embodiment 1;
  • FIG. 4 is a diagram showing the positional relationship between the lens body and the transmissive member included in the optical member according to Embodiment 1;
  • FIG. 10 is a diagram showing a positional relationship between an optical member and a sensor array according to Embodiment 2;
  • FIG. 10 is a diagram showing the positional relationship between the lens body and the transmissive member included in the optical member according to the second embodiment;
  • Cross-sectional view of an image reading device according to Embodiment 3 Perspective view of an optical member according to Embodiment 3
  • FIG. 11 is a diagram showing the positional relationship between an optical member and a sensor array according to Embodiment 3; Sectional view of the first modification of the image reading device according to the embodiment Sectional view of the second modification of the image reading device according to the embodiment Sectional view of the third modification of the image reading device according to the embodiment Sectional view of the fourth modification of the image reading device according to the embodiment FIG.
  • FIG. 10 is a diagram showing the positional relationship between an optical member and a sensor array included in a fourth modification of the image reading device according to the embodiment
  • FIG. 5 is a diagram showing another example of the positional relationship between the optical member and the sensor array according to the embodiment
  • FIG. 4 is a diagram showing another example of the positional relationship between the lens body and the transmissive member included in the optical member according to the embodiment
  • FIG. 4 is a diagram showing another example of the positional relationship between the lens body and the transmissive member included in the optical member according to the embodiment
  • an image reading device that reads information such as images, characters, patterns, etc. on the surface of the reading object D, which is a sheet-like member including documents, banknotes, securities, etc., a substrate, a web that is a sheet-like fiber, etc.
  • the image reading device 2 according to the first embodiment will be described with reference to the drawings.
  • the main scanning direction is set as the X-axis
  • the sub-scanning direction is set as the Y-axis
  • the reading depth direction is set as the Z-axis.
  • the main scanning direction and the sub-scanning direction intersect, preferably perpendicular to each other.
  • the X-axis, Y-axis, and Z-axis are orthogonal to each other. The same applies to subsequent figures.
  • the image reading device 2 includes a light source 9 that emits light to an object D to be read, and a light source 9 that emits the light. It comprises a transmission plate 10 for transmission, and an optical member 1 having a plurality of lens bodies for converging the light reflected by the object D to be read.
  • the image reader 2 further includes a sensor array 4 having a plurality of sensor elements 3 that receive light converged by the optical member 1, and a sensor substrate 11 on which the sensor array 4 is mounted.
  • the image reader 2 further includes a housing 12 to which the transmission plate 10 and the sensor substrate 11 are attached and which accommodates the light source 9, the optical member 1, and the sensor array 4 inside.
  • the light source 9 is a linear light source that irradiates linear light as indicated by the dashed arrow in FIG. Formed with a light source.
  • a sidelight light source is a light source having a light guide extending in the X-axis direction and a light source element arranged at the end of the light guide in the X-axis direction.
  • the light emitted from the light source 9 and used for reading the information on the reading object D is, for example, visible light.
  • the transmission plate 10 is attached to the housing 12 so as to block the opening 12a of the housing 12 facing the object D to be read.
  • the transmission plate 10 transmits light emitted by the light source 9 .
  • a member such as transparent glass or transparent resin, which has a high transmittance so that the light can be received by the sensor element 3 .
  • the transmission plate 10 has a flat plate-like shape extending in the main scanning direction and the sub-scanning direction and having both flat surfaces.
  • the surface of the transmission plate 10 opposite to the surface that closes the opening 12a of the housing 12 forms a reading surface of the object D to be read.
  • the reading surface regulates the reading position of the object D to be read.
  • the housing 12 has a box-like shape with an opening 12a facing the reading object D and an opening 12b facing the opposite side of the opening 12a.
  • the housing 12 is made of a member that blocks light from the outside, for example, a metal including aluminum, iron, or the like, a resin, or the like.
  • the light source 9, the optical member 1, and the sensor array 4 housed in the housing 12 are directly or indirectly attached to and held by the housing 12.
  • the housing 12 prevents light from entering the light receiving section, specifically the sensor element 3 , from the outside of the image reading device 2 . Further, the housing 12 prevents foreign matter such as dust and moisture from entering the inside of the image reading device 2 .
  • the sensor substrate 11 is a substrate made of resin such as glass epoxy.
  • the sensor substrate 11 is provided with a plurality of sensor elements 3 and other components (not shown) such as a drive circuit and a signal processing circuit.
  • the sensor substrate 11 is attached to the housing 12 in a state in which the opening 12b is closed in such a manner that the sensor element 3 is positioned in the opening 12b at the bottom of the housing 12 in the vertical direction.
  • a plurality of sensor elements 3 are arranged in the main scanning direction and fixed to the sensor substrate 11 by a fixing member such as an adhesive.
  • Each sensor element 3 is provided for each lens body 5 and receives light converged by the corresponding lens body 5 .
  • each sensor element 3 is formed by a sensor IC (Integrated Circuit).
  • the sensor element 3 receives the light converged by the corresponding lens body 5, photoelectrically converts the light into an electric signal, and outputs the electric signal.
  • the electrical signal output by the sensor element 3 is converted into image information by a signal processing circuit.
  • the optical member 1 includes a lens array 6 having a plurality of lens bodies 5 arranged in a line in the main scanning direction, and a plurality of lenses for allowing light incident from one end surface to exit from the other end surface.
  • a transmissive member array 8 having transmissive members 7 of .
  • the lens array 6 has a plurality of lens bodies 5 and two side plates 56 sandwiching the plurality of lens bodies 5 .
  • the plurality of lens bodies 5 are arranged at intervals in the main scanning direction.
  • the distance between the plurality of lens bodies 5 is larger than the alignment error of the plurality of lens bodies 5 and the plurality of transmissive members 7 .
  • Each lens body 5 converges the light from the object D to be read.
  • the extending direction of the optical axis AX1 of the lens body 5 is orthogonal to each of the main scanning direction and the sub-scanning direction. In other words, the optical axis AX1 of the lens body 5 extends parallel to the Z axis.
  • the lens body 5 converges the light emitted from the light source 9 and reflected by the object D to be read.
  • the lens body 5 preferably has a cylindrical shape, has a different refractive index in the radial direction, and is preferably formed of a rod lens that is a graded refractive index lens that forms an erect equal-magnification image.
  • the two side plates 56 face each other across the plurality of lens bodies 5 in the Y-axis direction.
  • the side plate 56 is formed of a plate-shaped member having a light-shielding property, for example, a metal containing aluminum, iron, or the like, a resin, or the like.
  • the space between the two side plates 56 is preferably filled with a light-shielding adhesive. This suppresses the relative positional deviation between each lens body 5 and each side plate 56 .
  • the transmission member array 8 prevents the images formed by the lens bodies 5 adjacent to each other from overlapping, in other words, separates the optical paths of the light converged by the lens bodies 5 adjacent to each other.
  • the transmission member array 8 has a plurality of transmission members 7 and two side plates 78 sandwiching the plurality of transmission members 7 .
  • the plurality of transmissive members 7 are arranged at intervals in the main scanning direction. The distance between the plurality of transmissive members 7 is larger than the alignment error of the plurality of lens bodies 5 and the plurality of transmissive members 7 .
  • Each transparent member 7 is provided for each lens body 5 , and is provided at a position closer to the reading object D than the corresponding lens body 5 or at a position farther from the reading target D than the corresponding lens body 5 .
  • the transmissive member 7 is located farther from the object D to be read than the lens body 5 , in other words, located between the lens body 5 and the sensor element 3 .
  • Each transmissive member 7 is provided in contact with the end portion of the lens body 5 in the direction of the optical axis AX1, specifically, the end portion on the Z-axis negative direction side.
  • the transmissive member 7 is formed of a member having a uniform refractive index regardless of the position, and has a columnar shape extending along the optical axis AX1 of the lens body 5.
  • a member with a uniform refractive index means that the refractive index at any position of the member is within a defined range that allows manufacturing errors.
  • the transmissive member 7 is a columnar member made of glass or resin having uniform refractive index and transmittance regardless of position.
  • the transmission member 7 is preferably formed of a member with sufficiently small strain, for example, a member with no strain. In Embodiment 1, the transmissive member 7 has a cylindrical shape with the same diameter as the lens body 5 .
  • the transmission member 7 transmits light emitted from the light source 9 .
  • the transmissive member 7 allows light to enter from one end face and emit light from the other end face.
  • the transmissive member 7 transmits light incident on the end face facing the lens body 5 from the lens body 5, that is, the end face facing the positive Z-axis direction, to the end face facing the sensor element 3, that is, the negative Z-axis direction. emitted from the end face facing the
  • the two side plates 78 face each other across the plurality of transmissive members 7 in the Y-axis direction.
  • the side plate 78 is made of a plate-like light-shielding member, such as a metal containing aluminum, iron, or the like, a resin, or the like.
  • the space between the two side plates 78 is preferably filled with a light-shielding adhesive. This prevents the transmission members 7 and the side plates 78 from being displaced relative to each other.
  • the side surface of the transmissive member 7, in other words, the outer peripheral surface of the transmissive member 7 around the Z axis is treated to suppress diffuse reflection of light incident on the side surface from the outside and to suppress specular reflection of light incident on the side surface from the outside.
  • the transmissive member 7 includes a cylindrical member 71 and a reflection suppressing member 72 formed of a cylindrical member whose inner peripheral surface contacts the outer peripheral surface of the cylindrical member 71 . have.
  • the transmissive member 7 is formed by applying a reflection suppressing member 72 made of black resin to the outer peripheral surface of the cylindrical member 71 .
  • the reflection suppressing member 72 is made of black resin and suppresses reflection of light from the side surface of the transmissive member 7 . Furthermore, the anti-reflection member 72 absorbs light from the inside of the transmissive member 7 to the outside through the side surface. A light shielding adhesive filled between the two side plates 78 may be used as the reflection suppressing member 72 .
  • FIG. 6 which is a view of the lens array 6 viewed in the positive direction of the Z axis, the central axis C1 of each transmissive member 7 and the optical axis AX1 of the lens body 5 are deviated from each other, and the end face of the transmissive member 7 and the corresponding end face of the lens body 5 may be misaligned.
  • An example in which an error occurs in the arrangement position of at least one of the lens body 5 and the transmissive member 7, specifically an example in which the lens bodies 5 are arranged at equal intervals and the transmissive members 7 are arranged at unequal intervals. are shown in FIGS. In FIG.
  • the outer shape of the lens body 5 is indicated by a solid line, and the outer shape of the transmissive member 7 is indicated by a dotted line.
  • the central axis C1 of the leftmost transparent member 7 and the optical axis AX1 of the leftmost lens body 5 coincide, but the central axis C1 of the other transparent member 7 and the optical axis AX1 of the corresponding lens body 5 does not match the Therefore, as shown in FIG. 6, the end face of the leftmost transmitting member 7 and the corresponding end face of the lens body 5 are aligned, but the end faces of the other transmitting members 7 and the corresponding end faces of the lens body 5 are shifted. To position.
  • the central axis C1 of the transmissive member 7 and the optical axis AX1 of the lens body 5 are not aligned, part of the light emitted from the lens body 5 is directed toward the lens body 5 as indicated by the dotted arrow in FIG. , i.e., the transparent member 7 in contact with the lens body 5 , and proceeds toward the adjacent transparent member 7 . Since the reflection suppressing member 72 is provided on the side surface of the transmissive member 7 as described above, the light reaching the side surface of the adjacent transmissive member 7 is absorbed.
  • the transmissive members 7 are arranged at intervals and the reflection suppressing members 72 are provided on the side surfaces of the transmissive members 7, even if the central axis C1 of the transmissive member 7 and the optical axis AX1 of the lens body 5 are deviated from each other, , optical paths of light converged by adjacent lens bodies 5 are separated.
  • part of the light incident on one end surface of the transmission member 7 from the lens body 5 travels straight through the transmission member 7 and reaches the sensor element 3 .
  • Another part of the light that has entered one end surface of the transmissive member 7 from the lens body 5 reaches the side surface of the transmissive member 7 . If the incident angle when reaching the side surface of the transmissive member 7 is greater than or equal to the critical angle, the light is totally reflected, travels straight through the transmissive member 7 , and reaches the sensor element 3 .
  • the incident angle on the side surface of the transmissive member 7 is small, so that the light does not undergo total reflection. , is refracted, enters the reflection suppression member 72 provided on the side surface of the transmission member 7, and is absorbed.
  • the light incident from one end surface of the transmissive member 7 reaches the side surface of the transmissive member 7. Therefore, direct emission from the other end surface is suppressed.
  • the light incident on one end face of the transmissive member 7 at a large tilt angle with respect to the central axis C1 does not reach the other end face of the transmissive member 7 and is not emitted from the other end face of the transmissive member 7 .
  • the light emitted from the transmissive member 7 is light whose incident angle on the side surface of the transmissive member 7 is equal to or greater than the critical angle.
  • a plurality of lens bodies 5 are arranged at intervals, and a plurality of transmissive members 7 are arranged at intervals. For this reason, as shown in FIG. 5, a plurality of sensor elements 3 are provided for each lens body 5 and arranged at intervals.
  • the sensor elements 3 are arranged at such intervals that they do not reach other sensor elements 3 adjacent to the .
  • the sensor elements 3 are spaced apart so that the light emitted from the transmissive member without reaching the side surface of the transmissive member 7 does not reach another sensor element 3 adjacent to the sensor element 3 facing the transmissive member 7 . should be left blank. As a result, as indicated by dashed arrows, light emitted from different transmission members 7 is prevented from reaching the same sensor element 3 .
  • the amount of light received by the sensor element 3 when the central axis C1 of the transparent member 7 and the optical axis AX1 of the lens body 5 are deviated is such that the central axis C1 of the transparent member 7 and the optical axis AX1 of the lens body 5 are aligned. is smaller than the amount of light received by the sensor element 3 at that time.
  • the deviation between the central axis C1 of the transmissive member 7 and the optical axis AX1 of the lens body 5 must be adjusted so that the amount of light received by the sensor element 3 can read the information on the object D to be read. It is preferable that the amount of light is within a range that provides the required amount of light.
  • the central axis C1 of at least one of the transmissive members 7 coincide with the optical axis AX1 of the corresponding lens body 5 .
  • the optical member 1 included in the image reading apparatus 2 according to Embodiment 1 includes a plurality of lens bodies 5 arranged at intervals and corresponding to the lens bodies 5 arranged at intervals. and a plurality of transmissive members 7 . Since the plurality of lens bodies 5 are arranged at intervals and the plurality of transmissive members 7 are arranged at intervals, the plurality of sensor elements 3 provided corresponding to the lens bodies 5 are also arranged at intervals. are spaced apart. Therefore, even if the optical axis AX1 of the lens body 5 and the central axis C1 of the transmissive member 7 do not match, the light emitted from the lens body 5 can be detected by the sensor element corresponding to the other lens body 5 adjacent to the lens body 5.
  • At least the interval in the main scanning direction is larger than the arrangement error of the plurality of lens bodies 5. At least the interval in the main scanning direction is larger than the arrangement error of the plurality of transmissive members 7 among the plurality of transmissive members 7 .
  • "Larger than the alignment error” means larger than the maximum possible alignment error.
  • At least one of the plurality of lens bodies 5 and the plurality of transmission members 7 may be arranged with a space therebetween that is larger than the arrangement error of the plurality of lens bodies 5 and the plurality of transmission members 7 .
  • the reflection suppressing member 72 on the side surface of the transmissive member 7, the optical paths of the light converged by the lens bodies 5 adjacent to each other are separated.
  • the shape and arrangement method of the lens body 5 and the transmissive member 7 are not limited to the above examples.
  • the optical member 1 having a shape different from that of the first embodiment and having the lens body 5 and the transmission member 7 arranged in a different manner, and the image reading device 2 having the optical member 1 are mainly different from the first embodiment. will be described in a second embodiment.
  • One of the plurality of lens bodies 5 and the plurality of transmission members 7 included in the optical member 1 included in the image reading device 2 according to Embodiment 2 is arranged with a space between each other, and the plurality of lens bodies 5 and the plurality of transmission members The other of 7 are arranged in abutment with each other.
  • the interval is larger than the arrangement error of the multiple lens bodies 5 and the multiple transmissive members 7 .
  • FIG. 7 and FIG. 8 which is a view of the lens array 6 viewed in the positive direction of the Z axis
  • the plurality of lens bodies 5 are arranged in contact with each other, and the plurality of transmitting members are arranged. 7 are spaced apart from each other.
  • the interval in the main scanning direction is larger than the arrangement error of the plurality of lens bodies 5 and the plurality of transmissive members 7 .
  • the lens body 5 and the transmission member 7 each have a cylindrical shape, and the diameter of the lens body 5 and the diameter of the transmission member 7 are different.
  • the diameter of lens body 5 is larger than the diameter of transmissive member 7 .
  • the lens bodies 5 are in contact with each other, that is, they are arranged at regular intervals, and the transmissive members 7 are arranged at irregular intervals. Therefore, in FIG. 7, the central axis C1 of the leftmost transmissive member 7 coincides with the optical axis AX1 of the corresponding lens body 5, but the central axis C1 of the other transmissive members 7 coincides with the optical axis AX1 of the corresponding lens body 5. is deviated from
  • the transmission member 7 Since the diameter of the transmission member 7 is smaller than the diameter of the lens body 5, part of the light emitted from the lens body 5 passes through the transmission member 7 corresponding to the lens body 5, as indicated by the dotted arrow in FIG. In other words, the light does not enter the transmitting member 7 that is in contact with the lens body 5 and proceeds toward the adjacent transmitting member 7 . While the lens bodies 5 are arranged in contact with each other, the transmission members 7 are arranged with a space therebetween. The light that has not entered the member 7 travels toward the side surface of the transparent member 7 without entering the transparent member 7 adjacent to the transparent member 7 . Since the side surface of the transmissive member 7 is provided with the reflection suppressing member 72 as in the first embodiment, the light reaching the side surface of the adjacent transmissive member 7 is absorbed.
  • the transmission member 7 is preferably provided at a position where the entire end surface of the transmission member 7 with a small diameter faces the end surface of the lens body 5 with a large diameter. Moreover, it is preferable that the central axis C1 of at least one of the transmissive members 7 coincide with the optical axis AX1 of the corresponding lens body 5 .
  • the optical member 1 included in the image reading apparatus 2 according to the second embodiment corresponds to the plurality of lens bodies 5 provided in contact with each other, and the lens bodies 5, which are spaced apart from each other. and a plurality of transparent members 7 provided. Since the transmissive members 7 are spaced apart from each other, light emitted from the lens body 5 and not entering the transmissive member 7 in contact with the lens body 5 passes through the transmissive member adjacent to the transmissive member 7. It reaches the side of 7 and is absorbed.
  • the optical member 1 and the image reader 2 in which overlapping of images formed by the lens body 5 is suppressed even if an error occurs in the arrangement position of at least one of the lens body 5 and the transparent member 7. .
  • the optical member 1 may further include a light shielding member.
  • the optical member 1 further including the light shielding member provided between the lens body 5 of the lens array 6 and the transmissive member 7 of the transmissive member array 8 and the image reading device 2 including the optical member 1 are different from those in the first embodiment.
  • a third embodiment will be described with a focus on points.
  • the optical member 1 included in the image reading device 2 shown in FIG. 9 is provided adjacent to a lens array 6 having a plurality of lens bodies 5 adjacent to each other as shown in FIGS. and a transparent member array 8 having a plurality of transparent members 7 .
  • the diameter of the lens body 5 and the diameter of the transmissive member 7 are the same, and each has a cylindrical shape.
  • the lens array 6 and the transmissive member array 8 are spaced apart in the Z-axis direction as shown in FIGS. Specifically, the lens body 5 and the transmissive member 7 are provided at an end portion in the extending direction of the optical axis AX1 of the lens body 5, that is, in the Z-axis direction, with a gap therebetween.
  • the optical member 1 further comprises at least one light blocking member 13 provided between the lens body 5 and the transmission member 7 and at a position having a predetermined distance from a straight line extending the optical axis of the lens body.
  • a plurality of light blocking members 13 are provided between the lens array 6 and the transmission member array 8.
  • the light shielding member 13 is made of a member having a light shielding property, for example, a black resin.
  • each light shielding member 13 is provided at a position in contact with each of two transmissive members 7 adjacent to each other.
  • Each light blocking member 13 is also provided in contact with the lens body 5 .
  • the central axis C1 of each transmissive member 7 and the optical axis AX1 of the corresponding lens body 5 do not match. Therefore, a part of one end face of the transmissive member 7 faces another lens body 5 adjacent to the lens body 5 to which the transmissive member 7 corresponds in the Z-axis direction.
  • the light shielding member 13 is provided at a position abutting on the two mutually adjacent transmissive members 7, as indicated by the dotted arrow in FIG. Light traveling toward other transmissive members 7 adjacent to the transmissive member 7 reaches the light shielding member 13 and is absorbed. Therefore, the optical paths of the light converged by the two lens bodies 5 adjacent to each other are separated by the light blocking member 13 .
  • the optical member included in the image reading device 2 according to Embodiment 3 includes the light shielding member 13 provided between the lens body 5 and the transmissive member 7 .
  • the light shielding member 13 separates the optical paths of the light converged by the lens bodies 5 adjacent to each other.
  • the optical axis AX1 of the lens body 5 and the central axis C1 of the transmissive member 7 do not match, the light emitted from the lens body 5 is transmitted through other transmissive members adjacent to the transmissive member 7 corresponding to the lens body 5. 7, the light is suppressed from being received by another sensor element 3 adjacent to the sensor element 3 corresponding to the lens body 5 .
  • the optical member 1 and the image reading device 2 are obtained in which overlapping of images formed by the lens body 5 is suppressed even if an error occurs in the arrangement position of at least one of the lens body 5 and the transparent member 7 .
  • the present disclosure is not limited to the examples of the embodiments described above.
  • the arrangement of the constituent elements of the optical member 1 is not limited to the above example.
  • the lens array 6 and the transparent member array 8 may be spaced apart in the Z-axis direction and held by the housing 12 .
  • the transparent member array 8 may be provided at a position closer to the object D to be read than the lens array 6 is.
  • the optical member 1 includes a transmission member array 8 having a plurality of transmission members 7 for emitting light incident on one end face from the reading object D from the other end face, and a transmission member array 8 having a plurality of transmission members 7 . and a lens array 6 having a plurality of lens bodies 5 for converging the light emitted from the other end surface of 7 and forming an image on each sensor element 3 .
  • the other end face of the transparent member 7 of the transparent member array 8 and the end face of the lens body 5 of the lens array 6 are in contact with each other, but the transparent member 7 and the lens body 5 are shown in FIG. , may be spaced apart from each other.
  • the distance between the plurality of lens bodies 5 and the distance between the plurality of transmissive members 7 are larger than the alignment error of the plurality of lens bodies 5 and the plurality of transmissive members 7 .
  • a light blocking member 13 may be provided between the transmitting member array 8 and the lens array 6, as shown in FIG. As indicated by the dotted arrow in FIG. 17, when the light shielding member 13 is provided, the light from the object D to be read passes through the transparent member 7 and is not directed to the lens body 5 corresponding to the transparent member 7. reaches the light shielding member 13 and is absorbed.
  • the method of arranging the lens body 5 and the transparent member 7 is not limited to the above example. As shown in FIGS. 18 and 19, the lens bodies 5 may be arranged at uneven intervals and the transmissive members 7 may be arranged at regular intervals.
  • the transmissive member 7 may have a cylindrical shape with a larger diameter than the lens body 5 .
  • the plurality of transmissive members 7 may be arranged in contact with each other, and the plurality of lens bodies 5 may be arranged at intervals.
  • the distances between the plurality of lens bodies 5 should be larger than the arrangement error of the plurality of lens bodies 5 and the plurality of transmissive members 7 .
  • an adhesive mixed with carbon black may be applied to the transmissive member 7 .
  • the material of the transmissive member 7 is not limited to the above examples.
  • the transmissive member 7 may be formed of any member that transmits light emitted from the light source 9 and used for reading the object D to be read.
  • the transmissive member 7 may be made of germanium, acrylic resin, glass, or the like.
  • the material of the reflection suppressing member 72 is not limited to the above examples.
  • the reflection suppressing member 72 may be formed of any member that suppresses reflection of light emitted from the light source 9 and used to read the object D to be read.
  • the object D to be read moves relative to the fixed image reading device 2, but the image reading device 2 moves relative to the fixed object D to read.
  • the information on the object D to be read may be read.
  • Conveyance of the reading object D in the sub-scanning direction, that is, the conveyance direction may be realized by conveying the reading object D itself, or may be realized by moving the image reading device 2 .
  • the position of the light source 9 is not limited to the above example.
  • the image reading device 2 may include the light source 9 located on the Z-axis positive direction side of the transparent plate 10 .
  • the object to be read D may be conveyed between the light source 9 and the transparent plate 10 .
  • the light source 9 may be provided outside the image reading device 2 . Specifically, in both the case where the optical member 1 converges the reflected light reflected by the reading object D and the case where the optical member 1 converges the transmitted light transmitted through the reading object D, the light source 9 is It may be provided outside the housing 12 .
  • the transmission plate 10 transmits the light emitted by the light source 9, and the transmitted light is not limited to visible light.
  • the transmission plate 10 may be formed of a member that transmits infrared rays, ultraviolet rays, or the like, for example. Even if it is made of a member that does not transmit visible light, it can be used as the transmission plate 10 as long as it transmits the light emitted by the light source 9 .
  • the transmissive plate 10 does not have to be attached to the image reading device 2, more specifically, the housing 12, if it is not necessary to form a transport surface for the object D to be read.
  • the configuration of the light source 9 is not limited to the above example, and as an example, includes a plurality of LEDs (Light Emitting Diodes) and an LED substrate extending in the main scanning direction and formed with each LED. good too. In this case, the plurality of LEDs should be arranged in an array along the main scanning direction. Although two light sources 9 are arranged with the optical member 1 therebetween in FIG. 1, one light source 9 may be arranged.
  • LEDs Light Emitting Diodes
  • the position where the sensor substrate 11 is provided is not limited to the example described above, and may be any position as long as the sensor array 4 provided on the sensor substrate 11 can receive light converged by the lens array 6 .
  • the lens body 5 may be any lens body for an erect equal-magnification optical system.
  • a microlens may be used as the lens body 5 .
  • the structure of the transmissive member 7 is not limited to the above example, and may be arbitrary as long as the light incident from one end surface can be emitted from the other end surface.
  • the transmissive member 7 may have a columnar shape in which a through-hole is formed penetrating in the extending direction of the central axis C1. In other words, the transmissive member 7 may have a cylindrical shape.
  • D read object 1 optical member, 2 image reading device, 3 sensor element, 4 sensor array, 5 lens body, 6 lens array, 56 side plate, 7 transparent member, 71 cylindrical member, 72 antireflection member, 8 transparent member array , 78 side plate, 9 light source, 10 transmission plate, 11 sensor substrate, 12 housing, 12a, 12b opening, 13 light shielding member, AX1 optical axis, C1 central axis.

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Facsimile Heads (AREA)
  • Facsimile Scanning Arrangements (AREA)
  • Optical Elements Other Than Lenses (AREA)
PCT/JP2022/023184 2021-06-09 2022-06-08 光学部材および画像読取装置 Ceased WO2022260102A1 (ja)

Priority Applications (4)

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CN202280039667.5A CN117413509A (zh) 2021-06-09 2022-06-08 光学部件以及图像读取装置
DE112022002971.4T DE112022002971T5 (de) 2021-06-09 2022-06-08 Optisches Element und Bildlesevorrichtung
US18/566,754 US12105303B2 (en) 2021-06-09 2022-06-08 Optical member and image reading device
JP2022572298A JP7337292B2 (ja) 2021-06-09 2022-06-08 光学部材および画像読取装置

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JP2021-096275 2021-06-09

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US (1) US12105303B2 (enExample)
JP (1) JP7337292B2 (enExample)
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WO (1) WO2022260102A1 (enExample)

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JPH06342131A (ja) * 1992-11-04 1994-12-13 Canon Inc レンズアレイ及びそれを用いた密着型イメージセンサー
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US20240264337A1 (en) 2024-08-08
CN117413509A (zh) 2024-01-16
US12105303B2 (en) 2024-10-01
DE112022002971T5 (de) 2024-06-06
JP7337292B2 (ja) 2023-09-01

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