WO2015151860A1 - Capteur de position - Google Patents

Capteur de position Download PDF

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Publication number
WO2015151860A1
WO2015151860A1 PCT/JP2015/058470 JP2015058470W WO2015151860A1 WO 2015151860 A1 WO2015151860 A1 WO 2015151860A1 JP 2015058470 W JP2015058470 W JP 2015058470W WO 2015151860 A1 WO2015151860 A1 WO 2015151860A1
Authority
WO
WIPO (PCT)
Prior art keywords
core
cladding layer
optical waveguide
layer
position sensor
Prior art date
Application number
PCT/JP2015/058470
Other languages
English (en)
Japanese (ja)
Inventor
良真 吉岡
裕介 清水
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 WO2015151860A1 publication Critical patent/WO2015151860A1/fr

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Classifications

    • 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
    • G06F3/0421—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by opto-electronic means by interrupting or reflecting a light beam, e.g. optical touch-screen
    • 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
    • G02B6/1221—Basic optical elements, e.g. light-guiding paths made from organic materials
    • 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
    • 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
    • G02B6/24—Coupling light guides
    • G02B6/26—Optical coupling means
    • G02B6/35—Optical coupling means having switching means
    • G02B6/3596—With planar waveguide arrangement, i.e. in a substrate, regardless if actuating mechanism is outside the substrate

Definitions

  • the present invention relates to a position sensor that optically detects a pressed position.
  • a position sensor that optically detects a pressed position has been proposed (see, for example, Patent Document 1).
  • a plurality of linear cores serving as optical paths are arranged in the vertical and horizontal directions, and a sheet-like optical waveguide is formed by covering the peripheral edge portions of the cores with a clad.
  • the light that has propagated through each core is detected by the light receiving element at the other end surface of each core.
  • the pressed part is recessed in the pressing direction and the core is crushed (the cross-sectional area of the core in the pressing direction is reduced).
  • the detection level of light at the light receiving element is lowered at the core of the pressing portion, the vertical and horizontal positions (coordinates) of the pressing portion can be detected.
  • the conventional position sensor has a problem that the core or the under clad layer is plastically deformed by a strong pressure (for example, a load of 13 N) and does not return to its original shape even when the pressure is released.
  • the present invention has been made in view of such circumstances, and even when a strong pressure of 13N is applied to the optical waveguide, the core and the under cladding layer of the optical waveguide are not plastically deformed, and when the pressure is released,
  • the purpose of the present invention is to provide a position sensor that quickly recovers to its original shape.
  • a position sensor of the present invention includes a plurality of linear cores formed in a lattice shape, an under cladding layer that supports the cores, and an over cladding layer that covers the cores.
  • a position comprising: a sheet-like optical waveguide; a light emitting element connected to one end face of the core of the optical waveguide; and a light receiving element connected to the other end face of the core and emitted from the light emitting element and reaching the core through the core
  • the core is set in an elastic range of 3 to 10% tensile elongation
  • the under cladding layer supporting the core is set in an elastic range of 5 to 140% tensile elongation.
  • the surface portion of the optical waveguide corresponding to the lattice-shaped core portion is formed in the input region, and the pressed portion in the input region is used to attenuate the received light intensity in the light receiving element due to the pressing.
  • Ri adopt a configuration that is specified.
  • the inventors of the present invention are able to release the optical waveguide core and the under-cladding layer when the pressure on the optical waveguide is released.
  • the core and the undercladding layer are defined as described above, and the core and the undercladding layer are quickly restored.
  • the over clad layer is also formed on the under clad layer so as to cover the core. However, if the core and the under clad layer return to the original shape, the light propagation in the core is also restored to the original state. Therefore, even if the over clad layer remains deformed, it can be prepared for the next pressing.
  • the position sensor of the present invention has a sheet-like optical waveguide in which a lattice-like core is supported by an under-cladding layer, and the core is set in an elastic range of a tensile elongation of 3 to 10%.
  • the undercladding layer is set to have an elastic range of 5 to 140% tensile elongation. Therefore, even when a strong pressure of 13 N is applied to the optical waveguide, the core and the under cladding layer of the optical waveguide are not plastically deformed, and can be quickly restored to the original shape when the pressure is released. That is, the position sensor of the present invention can quickly prepare for the next pressing, and is excellent in continuous detection of the pressing position.
  • the core and the undercladding layer are made of epoxy resin, it is easy to set the core and the undercladding layer in the elastic range within the range of the tensile elongation.
  • the over clad layer when the over clad layer is set in an elastic range of tensile elongation of 5 to 140%, the over clad layer is not plastically deformed even when a strong pressure of 13 N is applied to the optical waveguide. When the pressure is released, the original shape can be quickly recovered. For this reason, when the pressure is released, the trace of the pressure can be quickly eliminated from the surface of the optical waveguide (the surface of the over clad layer).
  • the 1st Embodiment of the position sensor of this invention is shown typically, (a) is the top view, (b) is the expanded sectional view. It is sectional drawing which shows the use condition of the said position sensor typically, (a) is a press state, (b) is the state which canceled the press. (A)-(d) is explanatory drawing which shows the manufacturing method of an optical waveguide typically. It is an expanded sectional view showing typically a 2nd embodiment of a position sensor of the present invention. (A) to (f) are enlarged plan views schematically showing a crossing form of lattice-like cores 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 a first embodiment of the position sensor of the present invention
  • FIG. 1 (b) is an enlarged cross-sectional view of the central portion thereof.
  • the position sensor of this embodiment includes a rectangular sheet-shaped optical waveguide W in which a lattice-shaped core 2 is supported by a rectangular sheet-shaped underclad layer 1 and covered with an overcladding layer 3, and the lattice-shaped core 2.
  • the light emitting element 4 connected to the one end surface of the linear core 2 to comprise, and the light receiving element 5 connected to the other end surface of the said linear core 2 are provided.
  • the core 2 is in the elastic region in the range of 3 to 10% tensile elongation
  • the under cladding layer 1 is in the elastic region in the range of 5 to 140% tensile elongation.
  • the over clad layer 3 is also in the elastic region in the range of 5 to 140% tensile elongation, like the under clad layer 1.
  • the light emitted from the light emitting element 4 passes through the core 2 and is received by the light receiving element 5.
  • the surface part of the over clad layer 3 corresponding to the part of the lattice-like core 2 is an input region.
  • the core 2 is indicated by a chain line, and the thickness of the chain line indicates the thickness of the core 2.
  • the number of cores 2 is omitted.
  • the arrow of Fig.1 (a) has shown the direction where light travels.
  • the core 2 has a tensile elongation of 3 to 10%. It is a major feature of the present invention that the undercladding layer 1 is in the elastic region and in the elastic region in the range of 5 to 140% tensile elongation.
  • the core 2 is preferably in the elastic region in the range of 5 to 10% tensile elongation
  • the undercladding layer 1 is in the elastic region in the range of 15 to 100% tensile elongation. That is.
  • the over clad layer 3 is also in the elastic region in the range of 5 to 140% tensile elongation, like the under clad layer 1, and therefore when the pressure is released, the surface of the optical waveguide W is released. From the (surface of the over clad layer 3), it is possible to quickly eliminate a pressing mark.
  • the position sensor detects the pressed position so that the back surface of the under clad layer 1 is in contact with the surface of a hard object such as a desk 30.
  • the pressing position is detected.
  • the core 2 and the under cladding layer 1 are recessed while maintaining elasticity.
  • the position sensor when the pressing is released, the optical waveguide W is caused by the specific elastic regions of the core 2, the under cladding layer 1 and the over cladding layer 3 as described above. Since the position sensor quickly recovers to the original flat shape, the position sensor can be quickly prepared for the next pressing, and is excellent in continuous detection of the pressing position.
  • the pressing position may be detected on the surface of the input area via a resin film, paper, or the like.
  • Examples of the material for forming the core 2, the under cladding layer 1 and the over cladding layer 3 having the above characteristics include, for example, an epoxy resin from the viewpoint of ease of setting the elastic region. From the viewpoint of ease of manufacturing the optical waveguide W, the epoxy resin or the like is preferably a photosensitive resin.
  • the refractive index of the core 2 is set larger than the refractive indexes of the under cladding layer 1 and the over cladding layer 3.
  • the refractive index can be adjusted by, for example, selecting the type of each forming material and adjusting the composition ratio.
  • a lattice-like core 2 is embedded in the surface portion of the sheet-like underclad layer 1, and the surface of the underclad layer 1 and the top surface of the core 2 face each other.
  • the sheet-like over clad layer 3 is formed in a state where the surface of the under clad layer 1 and the top surface of the core 2 are covered. Since the optical waveguide W having such a structure can make the over clad layer 3 have a uniform thickness, it is easy to detect the pressing position in the input region.
  • the thickness of 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.
  • the elastic modulus of the core 2 is preferably set to be equal to or higher 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 W having a considerably larger area than the area of the pen tip or the like that presses the input region portion of the over clad layer 3. This is because the above-mentioned 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 to 10 GPa, and the elastic modulus of the over cladding layer 3 is set within a range of 0.1 to 10 GPa.
  • the elastic modulus of the layer 1 is preferably set within a range of 0.1 to 1 GPa.
  • the over clad layer 3 is formed into a sheet having a uniform thickness.
  • the core 2 is formed in a predetermined pattern on the upper surface of the over clad layer 3 in a protruding state.
  • the under cladding layer 1 is formed on the upper surface of the over cladding layer 3 so as to cover the core 2.
  • the obtained structure is turned upside down so that the under cladding layer 1 is on the lower side and the over cladding layer 3 is on the upper side. In this way, the optical waveguide W is obtained.
  • the under cladding layer 1, the core 2 and the over cladding layer 3 are produced by a manufacturing method corresponding to each forming material.
  • FIG. 4 is an enlarged view of the cross section of the central portion of the second embodiment of the position sensor of the present invention.
  • the structure of the optical waveguide W is upside down with respect to the first embodiment shown in FIG. That is, the surface of the under-cladding layer 1 having a uniform thickness is formed in a predetermined pattern with the core 2 protruding, and the over-cladding layer is formed on the surface of the under-cladding layer 1 with the core 2 covered. 3 is formed.
  • the other parts are the same as those of the first embodiment shown in FIG. 1B, and the same reference numerals are given to the same parts.
  • the position sensor of this embodiment also has the same operations and effects as those of the first embodiment shown in FIG.
  • each intersection of the lattice-like core 2 is normally formed in a state where all four intersecting directions are continuous, as shown in an enlarged plan view in FIG.
  • 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 (it is sufficient if the gap G is formed) and is usually set to 20 ⁇ m or less.
  • two intersecting directions are discontinuous. As shown in FIG.
  • the three intersecting directions may be discontinuous, or as shown in FIG. 5 (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. 6 (a), in an intersection where all four intersecting directions are continuous, when light is focused on one intersecting direction (upward in FIG. 6 (a)), 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 is transmitted through the core 2 because the reflection angle at the wall surface is large [two points in FIG. (See chain line arrow). Such light transmission also occurs in the direction opposite to the above (downward in FIG. 6A). On the other hand, as shown in FIG. 6 (b), when one intersecting direction (upward in FIG.
  • the over clad layer 3 is also in the elastic region in the range of tensile elongation of 5 to 140%, similar to the under clad layer 1, but the over clad layer 3 has other elastic characteristics. May be used.
  • an elastic layer such as a rubber layer may be provided on the lower surface of the under cladding layer 1.
  • the under-cladding layer 1, the core 2 and the over-cladding layer 3 recover not only to their own restoring force but also to the original shape by utilizing the elastic force of the elastic layer. be able to.
  • the under clad layer 1 may be made of the same material as that of the elastic layer, and a laminate including the under clad layer 1 and the elastic layer may be handled as one layer.
  • an over clad layer was formed on the surface of a glass substrate by spin coating using the above clad forming material.
  • the over cladding layer had a thickness of 25 ⁇ m.
  • a lattice-like core was formed on the surface of the over clad layer by photolithography using the core forming material.
  • the core had a width of 30 ⁇ m and a thickness of 50 ⁇ m. Note that the core could not be patterned with a material having a tensile elongation exceeding 10%.
  • an under clad layer was formed on the upper surface of the over clad layer by spin coating using the clad forming material so as to cover the core.
  • the thickness of this under cladding layer was 500 ⁇ m.
  • the over clad layer was peeled off from the glass substrate.
  • the under cladding layer was bonded to the surface of the aluminum plate via an adhesive.
  • the optical waveguide was produced on the surface of the aluminum plate via the adhesive.
  • a light emitting element (Optowell, XH85-S0603-2s) is connected to one end face of the core of the optical waveguide, and a light receiving element (Hamamatsu Photonics, s10226) is connected to the other end face of the core.
  • a light receiving element (Hamamatsu Photonics, s10226) is connected to the other end face of the core.
  • CMOS scan speed CMOS scan speed
  • CMOS scan speed CMOS scan speed
  • results were evaluated as inferior to continuous detection (shape recoverability) of the position sensor, and x was shown in Table 1 below.
  • plastic deformation was caused by applying the above load, and the shape did not recover even when the load was released.
  • the optical waveguide is shown in a sectional view in FIG. 1B.
  • the optical waveguide is shown in the sectional view in FIG. 4 as in the first to fifth embodiments.
  • An evaluation result showing the tendency was obtained.
  • the position sensor of the present invention can be used to quickly eliminate a pressing mark when detecting a pressing position and to improve continuous detection.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Human Computer Interaction (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optical Integrated Circuits (AREA)

Abstract

La présente invention concerne un capteur de position tel que, même si un fort contact présentant une charge de 13 N est appliqué à un guide d'ondes optiques, les cœurs dudit guide d'ondes optiques et une couche de gaine inférieure ne subissent aucune déformation plastique et reprennent assez rapidement leur forme originale. Ledit capteur de position comprend les éléments suivants : un guide d'ondes optiques de type feuille quadrangulaire (W) dans lequel un réseau de cœurs (2) est supporté par une couche de gaine inférieure de type feuille quadrangulaire (1) et recouvert d'une couche de gaine supérieure (3) ; un élément d'émission de lumière (4) relié à une surface d'extrémité de chaque cœur linéaire (2) constituant le réseau de cœurs (2) ; et un élément de réception de lumière (5) relié à l'autre surface d'extrémité de chaque cœur linéaire (2). Les cœurs (2) sont constitués de manière à présenter une région élastique se situant dans la plage d'allongement en traction de 3 % à 10 %. La couche de gaine inférieure (1) est constituée de manière à présenter une région élastique se situant dans la plage d'allongement en traction de 5 % à 140 %.
PCT/JP2015/058470 2014-04-03 2015-03-20 Capteur de position WO2015151860A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2014076893A JP2015197878A (ja) 2014-04-03 2014-04-03 位置センサ
JP2014-076893 2014-04-03

Publications (1)

Publication Number Publication Date
WO2015151860A1 true WO2015151860A1 (fr) 2015-10-08

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Application Number Title Priority Date Filing Date
PCT/JP2015/058470 WO2015151860A1 (fr) 2014-04-03 2015-03-20 Capteur de position

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JP (1) JP2015197878A (fr)
TW (1) TW201543309A (fr)
WO (1) WO2015151860A1 (fr)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2005107804A (ja) * 2003-09-30 2005-04-21 Japan Aviation Electronics Industry Ltd 光導波路型タッチパネル
JP2013015736A (ja) * 2011-07-05 2013-01-24 Hitachi Chem Co Ltd フレキシブル光導波路及びフレキシブル光電気複合基板

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2005107804A (ja) * 2003-09-30 2005-04-21 Japan Aviation Electronics Industry Ltd 光導波路型タッチパネル
JP2013015736A (ja) * 2011-07-05 2013-01-24 Hitachi Chem Co Ltd フレキシブル光導波路及びフレキシブル光電気複合基板

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Publication number Publication date
JP2015197878A (ja) 2015-11-09
TW201543309A (zh) 2015-11-16

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