WO2016043048A1 - Capteur de position - Google Patents

Capteur de position Download PDF

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Publication number
WO2016043048A1
WO2016043048A1 PCT/JP2015/074904 JP2015074904W WO2016043048A1 WO 2016043048 A1 WO2016043048 A1 WO 2016043048A1 JP 2015074904 W JP2015074904 W JP 2015074904W WO 2016043048 A1 WO2016043048 A1 WO 2016043048A1
Authority
WO
WIPO (PCT)
Prior art keywords
core
light
lattice
outer peripheral
position sensor
Prior art date
Application number
PCT/JP2015/074904
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English (en)
Japanese (ja)
Inventor
良真 吉岡
裕介 清水
柴田　直樹
Original Assignee
日東電工株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 日東電工株式会社 filed Critical 日東電工株式会社
Publication of WO2016043048A1 publication Critical patent/WO2016043048A1/fr

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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/10—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings of the optical waveguide type
    • G02B6/12—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings of the optical waveguide type of the integrated circuit kind
    • G02B6/122—Basic optical elements, e.g. light-guiding paths
    • G02B6/125—Bends, branchings or intersections
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
    • G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
    • G06F3/042—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by opto-electronic means

Definitions

  • the present invention relates to a position sensor that optically detects a pressed position.
  • the present applicant has proposed a position sensor that optically detects the pressed position (see, for example, Patent Document 1).
  • this has a rectangular sheet-shaped optical waveguide W ⁇ b> 1 in which a sheet-shaped core pattern member is sandwiched between a rectangular sheet-like under cladding layer 11 and an over cladding layer 13.
  • the core pattern member includes a lattice-shaped portion 12A formed by arranging a plurality of linear optical path cores 12 vertically and horizontally, and extends from the core 12 of the lattice-shaped portion 12A to the outer periphery of the lattice-shaped portion 12A.
  • positioned in the state along is provided.
  • a light emitting element 14 is connected to one end face of the core 12 of the outer peripheral portion 12B of the core pattern member, and a light receiving element 15 is connected to the other end face of the core 12.
  • the light emitted from the light emitting element 14 passes through the core 12 from the outer peripheral portion 12B connected to the light emitting element 14 through the lattice portion 12A and the outer peripheral portion 12B on the opposite side. It is designed to receive light.
  • a surface portion of the over clad layer 13 corresponding to the lattice portion 12A (a rectangular portion indicated by a one-dot chain line in the center of FIG. 4) is an input region 13A of the position sensor.
  • the input area 13A When inputting, the input area 13A is pressed with, for example, an input pen tip. Thereby, the core 12 of the pressed portion is deformed, and the light propagation amount of the core 12 is reduced. Therefore, in the core 12 of the pressing portion, the light receiving level at the light receiving element 15 is lowered, so that the pressing position can be detected.
  • a light emitting element and a light receiving element are mounted on an electric circuit board. From the viewpoint of reducing the manufacturing cost by making the electric circuit board as compact as possible, the light emitting element and the light receiving element are combined. It is common technical knowledge to place them close together. In fact, in the position sensor shown in FIG. 4, both the light emitting element 14 and the light receiving element 15 are provided on one side (the lower end side in FIG. 4) of the rectangular sheet-shaped optical waveguide W ⁇ b> 1. Are placed close together.
  • the spectral intensity of the propagating light is made substantially equal between the vertical core 12 and the horizontal core 12, It is necessary to make the difference small. Therefore, the arrangement and the like of the core 12 of the outer peripheral portion 12B are designed so as to be so. However, the spectral intensity of the light may differ greatly between the vertical direction and the horizontal direction due to variations in the quality of the forming material such as the core 12 and variations in dimensions during the manufacturing process. If the difference in spectral intensity of the light exceeds the allowable range, the pressed position may not be detected properly. In that case, the vertical and horizontal spectral intensities are adjusted by redesigning the arrangement of the core 12 in the outer peripheral portion 12B of the core pattern member, and the difference is made within an allowable range.
  • the redesign and the like require a cost.
  • the arrangement of the light emitting element 14 and the light receiving element 15 is limited, and therefore there is a limit to the device for arranging the core 12 of the outer peripheral portion 12B. Therefore, it takes time to adjust the vertical and horizontal spectral intensity. In these respects, the position sensor has room for improvement.
  • the present invention has been made in view of such circumstances, and provides a position sensor capable of easily reducing the difference between the vertical direction and the horizontal direction of the spectral intensity of light propagating through the lattice-shaped core. Is the purpose.
  • the position sensor of the present invention has a lattice-shaped portion composed of a plurality of linear cores, and extends along the outer periphery of the lattice-shaped portion extending from the core of the lattice-shaped portion.
  • a position sensor including an element, wherein one end surface and the other end surface of a core in an outer peripheral portion where a longitudinal core of the lattice portion is extended, and a lateral core of the lattice portion is extended.
  • One end face and the other end face of the core in the outer peripheral portion are positioned on one side of the rectangular shape of the substantially rectangular sheet-shaped optical waveguide, and one light emitting element is connected to each of the two end faces of the core in the outer peripheral portion.
  • the outer circumference One light receiving element is connected to each of the two other end surfaces of the core, and light emitted from the light emitting element is received by the light receiving element through the core of the optical waveguide, and the core pattern member
  • the surface portion of the position sensor corresponding to the lattice portion is used as an input region, and the pressing position in the input region is specified by the light propagation amount of the core changed by the pressing.
  • the position sensor of the present invention breaks down the conventional common sense, and even if the manufacturing cost is sacrificed, priority is given to the detection of the pressed position, and two light emitting elements and two light receiving elements are used. Yes. And, one light emitting element is connected to one end face of the core of the outer peripheral part where the longitudinal core of the lattice-like part is extended, and one light receiving element is connected to the other end face of the core, The remaining one light-emitting element is connected to one end face of the core in the outer peripheral part where the horizontal core of the grid-like part is extended, and the remaining one light-receiving element is connected to the other end face of the core. ing.
  • the spectral intensity of light can be individually adjusted in the vertical direction and the horizontal direction, the difference between the two is reduced, and the detectability of the pressed position is improved.
  • two light emitting elements and two light receiving elements are used, respectively, and one light emitting element is provided on one end face of the core in the outer peripheral portion where the longitudinal core of the lattice-like portion is extended.
  • One light-receiving element is connected to the other end face of the core, and the remaining one light-emitting element is attached to one end face of the core in the outer peripheral part where the horizontal core of the lattice-like part is extended.
  • the remaining one light receiving element is connected to the other end face of the core. Therefore, the spectral intensity of the light propagating through the core of the lattice portion can be individually adjusted in the vertical direction and the horizontal direction of the lattice portion.
  • the two light-emitting elements and the light-receiving elements are connected to the core from the two light-emitting elements and the light-receiving elements. It is arranged on one side of the rectangular shape of the optical waveguide.
  • these elements are arranged at positions close to each other. For this reason, even if the number of elements is increased, the electric circuit board on which the elements are mounted can be made compact, and the manufacturing cost can be suppressed.
  • (A) is a top view which shows typically one Embodiment of the position sensor of this invention
  • (b) is an expanded sectional view of the center part.
  • (A) to (f) are enlarged plan views schematically showing the crossing form of the cores of the lattice-like portion in the position sensor.
  • (A), (b) is an enlarged plan view which shows typically the course of the light in the cross
  • FIG. 1 (a) is a plan view showing an embodiment of the position sensor of the present invention
  • FIG. 1 (b) is an enlarged view of the cross section of the central portion thereof.
  • the position sensor of this embodiment includes a substantially rectangular sheet-shaped optical waveguide W and two light-emitting elements 4 and 2 arranged on one side of the optical waveguide W (the lower side in FIG. 1A).
  • the number of the elements 4 and 5 is a major feature of the present invention.
  • the optical waveguide W is extended on the surface of the substantially quadrilateral sheet-like under cladding layer 1 from a lattice portion 2A composed of a plurality of linear optical path cores 2 and the core 2 of the lattice portion 2A.
  • a sheet-like core pattern member provided with an outer peripheral portion 2B arranged along the outer periphery of the lattice-like portion 2A is formed, and the surface of the under-cladding layer 1 is covered with the core pattern member.
  • the over clad layer 3 is formed.
  • One end surface and the other end surface of the core 2 of 2B are positioned on one side of the substantially rectangular sheet-shaped optical waveguide W [lower side in FIG. 1A].
  • the core 2 is indicated by a chain line
  • the thickness of the chain line indicates the thickness of the core 2
  • the number of the cores 2 in the lattice-like portion 2A is omitted.
  • the arrow of Fig.1 (a) has shown the direction where light travels.
  • one light emitting element 4 is connected to one end surface of the core 2 of the outer peripheral portion 2B where the longitudinal core 2 of the lattice-shaped portion 2A of the core pattern member is extended, and the other end surface of the core 2 is connected to the other end surface of the core 2
  • One light-receiving element 5 is connected, and the remaining one light-emitting element 4 is connected to one end surface of the core 2 of the outer peripheral part 2B in which the horizontal core 2 of the lattice-like part 2A extends.
  • the remaining one light receiving element 5 is connected to the other end surface of the core 2.
  • the light emitted from the light emitting element 4 passes through the core 2 through the outer peripheral part 2B on the opposite side from the outer peripheral part 2B connected to the light emitting element 4 through the lattice part 2A.
  • the light receiving element 5 receives light.
  • the surface portion of the over clad layer 3 corresponding to the lattice-like portion 2A of the core pattern member [rectangular portion indicated by a one-dot chain line in the center of FIG. 1A] is an input region 3A.
  • the position sensor uses two light emitting elements 4 and two light receiving elements 5, respectively.
  • the vertical direction and the horizontal direction of the lattice-shaped portion 2A two directions ( The light emitting element 4 and the light receiving element 5 are connected to each other (XY direction). Therefore, the light in these two directions can be individually controlled. As a result, even if a difference in the spectral intensity of light occurs between the vertical direction and the horizontal direction, the difference can be easily reduced, and the pressed position can be detected appropriately.
  • the difference in spectral intensity is preferably 1 dB or less.
  • the elements 4 and 5 are substantially rectangular sheet-shaped light guides They are arranged on one side of the rectangular shape of the waveguide W and are close to each other. Therefore, even if the number of the elements 4 and 5 increases, the electric circuit board (not shown) on which the elements 4 and 5 are mounted can be made compact, and the manufacturing cost can be suppressed.
  • the position sensor when the input area 3A of the position sensor is widened or the detection accuracy of the pressed position in the input area 3A is improved, it is necessary to increase the number of cores 2.
  • the light emitting element 4 and two light receiving elements 5 are used, respectively, and the increase in the number of cores 2 can be easily accommodated without weakening the spectral intensity of light propagating through the cores 2. That is, the position sensor can easily cope with the enlargement of the input area 3A and the improvement of the detection accuracy of the pressed position.
  • the input of characters or the like to the position sensor is performed by writing the characters or the like in the input area 3A directly or via a resin film or paper with an input body such as a pen.
  • the input area 3A is pressed with a pen tip or the like, the core 2 of the pressed portion is deformed, and the light propagation amount of the core 2 is reduced. Therefore, in the core 2 of the pressing portion, the light receiving level at the light receiving element 5 is lowered, so that the pressing position (XY coordinate) can be detected.
  • the elastic modulus of the core 2 is preferably set to be larger than the elastic modulus of the under cladding layer 1 and the over cladding layer 3. The reason is that if the elastic modulus is set in the opposite direction, the periphery of the core 2 becomes hard, so that the optical waveguide having an area considerably larger than the area of the pen tip or the like that presses the input region 3A portion of the over clad layer 3 This is because the W portion is recessed and it is difficult to accurately detect the pressed position.
  • each elastic modulus for example, the elastic modulus of the core 2 is set within a range of 1 GPa or more and 10 GPa or less, and the elastic modulus of the over clad layer 3 is set within a range of 0.1 GPa or more and less than 10 GPa
  • the elastic modulus of the under cladding layer 1 is preferably set within a range of 0.1 MPa to 1 GPa.
  • the elastic modulus of the core 2 is large, the core 2 is not crushed by a small pressing force (the cross-sectional area of the core 2 is not reduced), but the optical waveguide W is recessed by the pressing, and therefore corresponds to the recessed portion.
  • Light leakage (scattering) occurs from the bent portion of the core 2, and in the core 2, the light receiving level at the light receiving element 5 decreases, so that the pressed position can be detected.
  • Examples of the material for forming the under cladding layer 1, the core 2 and the over cladding layer 3 include a photosensitive resin, a thermosetting resin, and the like, and the optical waveguide W can be manufactured by a manufacturing method corresponding to the forming material.
  • the refractive index of the core 2 is set to be larger than the refractive indexes of the under cladding layer 1 and the over cladding layer 3.
  • the refractive index and the elastic modulus can be adjusted by, for example, selecting the type of each forming material and adjusting the composition ratio.
  • each layer is set, for example, in the range of 10 to 500 ⁇ m for the under cladding layer 1, in the range of 5 to 100 ⁇ m for the core 2, and in the range of 1 to 200 ⁇ m for the over cladding layer 3.
  • a rubber sheet may be used as the undercladding layer 1 and the cores 2 may be formed in a lattice shape on the rubber sheet.
  • each of the intersecting portions of the core 2 of the lattice-shaped portion 2A is normally formed in a state in which all of the four intersecting directions are continuous, as shown in an enlarged plan view in FIG. Others are acceptable.
  • FIG. 2B only one intersecting direction may be divided by the gap G and discontinuous.
  • the gap G is formed of a material for forming the under cladding layer 1 or the over cladding layer 3.
  • the width d of the gap G exceeds 0 (zero), and is usually set to 20 ⁇ m or less.
  • two intersecting directions two opposing directions in FIG. 2 (c) and two adjacent directions in FIG.
  • the three intersecting directions may be discontinuous, or as shown in FIG. 2 (f), all the four intersecting directions may be discontinuous. It may be discontinuous.
  • the light crossing loss can be reduced. That is, as shown in FIG. 3 (a), in an intersection where all four intersecting directions are continuous, if one of the intersecting directions (upward in FIG. 3 (a)) is noted, the light incident on the intersection Part of the light reaches the wall surface 2a of the core 2 orthogonal to the core 2 through which the light has traveled, and the incident angle at the wall surface is smaller than the critical angle, so that the light passes through the core 2 [FIG. )) Such transmission of light also occurs in the direction opposite to the above (downward in FIG. 3A). On the other hand, as shown in FIG.
  • Component a 60 parts by weight of an epoxy resin (Mitsubishi Chemical Corporation YL7410).
  • Component b 40 parts by weight of epoxy resin (manufactured by Daicel, EHPE3150).
  • Component c 4 parts by weight of a photoacid generator (manufactured by Sun Apro, CPI101A).
  • Component d 90 parts by weight of an epoxy resin (manufactured by Daicel Corporation, EHPE3150).
  • Component e 10 parts by weight of an epoxy resin (manufactured by Mitsubishi Chemical Corporation, Epicoat 1002).
  • Component f 1 part by weight of a photoacid generator (manufactured by ADEKA, SP170).
  • Component g 50 parts by weight of ethyl lactate (manufactured by Wako Pure Chemical Industries, Ltd., solvent).
  • a core forming material was prepared by mixing these components d to g.
  • an under clad layer was formed by spin coating using the under clad layer forming material.
  • the thickness of this under cladding layer was 25 ⁇ m.
  • the elastic modulus was 240 MPa and the refractive index was 1.496.
  • the elastic modulus was measured using a viscoelasticity measuring device (TA instruments Japan Inc., RSA3).
  • a sheet-like core pattern member having a lattice-shaped portion composed of a plurality of linear cores and an outer peripheral portion is formed on the surface of the under-cladding layer by the photolithography method using the core forming material.
  • the size of the grid portion (input area) was 210 mm long ⁇ 297 mm wide.
  • the width of the core was 100 ⁇ m, the thickness was 50 ⁇ m, and the width of the gap between adjacent parallel linear cores in the lattice portion was 500 ⁇ m.
  • the elastic modulus was 1.58 GPa and the refractive index was 1.516.
  • an over clad layer was formed on the surface of the under clad layer by spin coating using the over clad layer forming material so as to cover the core pattern member.
  • the thickness of this over clad layer was 40 ⁇ m.
  • the elastic modulus was 240 MPa and the refractive index was 1.496. In this way, a sheet-like optical waveguide was produced.
  • one light emitting element and one light receiving element are provided, and one light emitting element is connected to one end face of both cores of the outer peripheral part in which the vertical direction and the horizontal direction of the lattice-shaped part are extended, One light receiving element was connected to the other end faces of the cores (see FIG. 4).
  • the above example and the comparative example were compared with respect to the spectral intensity of light received by the light receiving element.
  • the difference between the vertical direction and the horizontal direction of the spectral intensity of the light of the lattice-shaped portion of the core pattern member is 1 dB in the example and 5 dB in the comparative example, and the example is smaller than the comparative example. It was.
  • the position sensor of the present invention can be used to reduce the difference between the vertical direction and the horizontal direction of the spectral intensity of propagating light in the lattice-like core of the optical waveguide constituting the position sensor.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • General Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Optics & Photonics (AREA)
  • Human Computer Interaction (AREA)
  • Optical Integrated Circuits (AREA)

Abstract

L'invention concerne un capteur de position permettant de réduire facilement la différence entre les intensités spectrales, dans les directions verticale et horizontale, de la lumière se propageant à travers un cœur de réseau. Ce capteur de position comprend : un guide d'ondes optiques de type feuille sensiblement rectangulaire (W) comprenant un élément de motif de cœur de type feuille pourvu d'une section de réseau (2A) comprenant une pluralité de cœurs linéaires (2) ; une section périphérique extérieure (2B) qui s'étend à partir de chaque cœur (2) de la section de réseau (2A) et qui est disposée le long de la périphérie extérieure de la section de réseau (2A) ; deux éléments d'émission de lumière (4) ; et deux éléments de réception de lumière (5). Une surface d'extrémité et une autre surface d'extrémité du cœur (2) de la section périphérique extérieure (2B) à partir de laquelle s'étendent les cœurs en direction verticale (2) de la section de réseau (2A), et une surface d'extrémité et une autre surface d'extrémité du cœur (2) de la section périphérique extérieure (2B) à partir de laquelle s'étendent les cœurs en direction horizontale (2) de la section de réseau (2A), sont positionnées d'un côté de la forme rectangulaire du guide d'ondes optique (W). L'un des éléments d'émission de lumière (4) est connecté respectivement aux surfaces d'extrémité des deux cœurs (2) de la section périphérique extérieure (2B). L'un des éléments de réception de lumière (5) est connecté respectivement aux autres surfaces d'extrémité des deux cœurs (2) de la section périphérique extérieure (2B).
PCT/JP2015/074904 2014-09-16 2015-09-02 Capteur de position WO2016043048A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2014187704A JP2016062159A (ja) 2014-09-16 2014-09-16 位置センサ
JP2014-187704 2014-09-16

Publications (1)

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WO2016043048A1 true WO2016043048A1 (fr) 2016-03-24

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JP (1) JP2016062159A (fr)
TW (1) TW201614457A (fr)
WO (1) WO2016043048A1 (fr)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2013073276A (ja) * 2011-09-26 2013-04-22 Nitto Denko Corp 入力デバイス
WO2014136481A1 (fr) * 2013-03-08 2014-09-12 日東電工株式会社 Sous-couche électronique

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2013073276A (ja) * 2011-09-26 2013-04-22 Nitto Denko Corp 入力デバイス
WO2014136481A1 (fr) * 2013-03-08 2014-09-12 日東電工株式会社 Sous-couche électronique

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TW201614457A (en) 2016-04-16
JP2016062159A (ja) 2016-04-25

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