WO2015159754A1 - Capteur de position - Google Patents

Capteur de position Download PDF

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Publication number
WO2015159754A1
WO2015159754A1 PCT/JP2015/060791 JP2015060791W WO2015159754A1 WO 2015159754 A1 WO2015159754 A1 WO 2015159754A1 JP 2015060791 W JP2015060791 W JP 2015060791W WO 2015159754 A1 WO2015159754 A1 WO 2015159754A1
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WO
WIPO (PCT)
Prior art keywords
sheet
core
position sensor
protective sheet
layer
Prior art date
Application number
PCT/JP2015/060791
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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 WO2015159754A1 publication Critical patent/WO2015159754A1/fr

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    • 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.
  • Patent Document 1 a position sensor that optically detects a pressed position (input position) has been proposed (see, for example, Patent Document 1).
  • a plurality of cores serving as optical paths are arranged in the vertical and horizontal directions, and the peripheral portions of the cores are covered with a clad to form a sheet, and light from the light emitting element is incident on one end surface of each of the cores, The light transmitted through each core is detected by the light receiving element at the other end surface of each core.
  • the core of the pressed portion (input position) is crushed (the cross-sectional area of the core in the pressing direction is reduced), and the core of the pressed portion is Since the light detection level at the light receiving element is lowered, the pressed position can be detected.
  • the pressing is released, the part returns to the original flat state to prepare for the next pressing.
  • the present inventors mount a PET (polyethylene terephthalate) sheet material as a protective sheet on the surface of the position sensor. I put it. And the character etc. were input with the writing implements, such as a pen, from the surface of the protection sheet. However, it may not be detected as entered.
  • a PET polyethylene terephthalate
  • the input mark when the input mark is not detected as input, the input mark (press mark by the tip of the writing instrument) does not return to the original flat state, but remains in a groove shape. I found out that it was in a state. At that time, it was also found that although the protective sheet was not adhered to the surface of the position sensor, the recessed portion locally adhered to the surface of the position sensor. That is, as shown in a cross-sectional view in FIG. 5A, the protective sheet S1 is recessed together with the position sensor W1 by pressing with the writing instrument 10 during the input, but the recessed portion of the protective sheet S1 is the position sensor W1.
  • the position sensor W1 can be used even when the pressure is released, as shown in a sectional view in FIG. This deformation is constrained, and the dents are not restored to the original flat state. The dent is in a state of pressing the surface of the position sensor W1. Therefore, even if the tip of the writing instrument 10 moves to another position, the dent of the movement trace (pressing trace) that does not need to be detected is always detected (noise). It is not detected on the street.
  • reference numeral 51 denotes a cladding
  • reference numeral 52 denotes a core.
  • the present invention has been made in view of such circumstances, and an object thereof is to provide a position sensor that can normally detect an input position (as input) even if a protective sheet is provided on the surface. .
  • 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 sheet-like position sensor comprising a sheet-shaped optical waveguide, a light emitting element connected to one end face of the core, and a light receiving element connected to the other end face of the core, on the surface of the over clad layer,
  • a protective sheet of the following (A) is placed, and a configuration is adopted in which a pressing portion is specified by a change in the amount of light propagation of the core due to pressing on an arbitrary portion of the surface of the position sensor.
  • the protective sheet in which the arithmetic average roughness Ra of the contact surface with the over cladding layer is set to 10 ⁇ m or more.
  • the above-described conventional technique is used.
  • the reason why the input part (pressing part) of the protective sheet sticks to the surface of the position sensor was investigated.
  • the cause was that the surface roughness of the contact surface of the protective sheet in contact with the surface of the position sensor was small (arithmetic average roughness Ra was less than 10 ⁇ m). That is, it has been found that the contact area of the protective sheet with the position sensor is large and sticks due to the initial adhesiveness (tack) of the surface of the position sensor.
  • the present inventors even if the surface of the over clad layer of the sheet-shaped optical waveguide constituting the position sensor of the present invention has initial adhesiveness (tack), the input portion (pressing portion) in the protective sheet
  • the surface roughness of the contact surface of the protective sheet As a result, when the arithmetic average roughness Ra of the contact surface of the protective sheet with the over clad layer is set to 10 ⁇ m or more, the input portion (pressed portion) of the protective sheet does not stick to the surface of the over clad layer. I found out.
  • the protective sheet when pressing the protective sheet during input, the protective sheet is recessed with the sheet-shaped optical waveguide, and when the pressing is released, the protective sheet quickly returns to the original flat state together with the sheet-shaped optical waveguide. Become. As a result, the present inventors have found that the input position is normally detected (as input) and reached the present invention.
  • a protective sheet in which the arithmetic average roughness Ra of the contact surface with the over clad layer is set to 10 ⁇ m or more is placed on the surface of the over clad layer of the sheet-like optical waveguide.
  • the input part (pressing part) in the protective sheet can be prevented from sticking to the surface of the over clad layer.
  • the protective sheet can be recessed together with the sheet-shaped optical waveguide, and when the pressing is released, the protective sheet is quickly returned to the original flat shape together with the sheet-shaped optical waveguide. It will be possible to return to the state. Therefore, the position sensor of the present invention can detect the input position normally (as input). Furthermore, the position sensor of the present invention has excellent durability due to the provision of the protective sheet.
  • FIG. 1 An embodiment of the position sensor of the present invention is schematically shown, (a) is a plan view thereof, and (b) is an enlarged sectional view of a central portion thereof. 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) 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 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 according to this embodiment includes a rectangular sheet-like optical waveguide W in which a lattice-like core 2 is sandwiched between a rectangular sheet-like underclad layer 1 and an overclad layer 3, and the lattice-like core 2.
  • the light emitting element 4 connected to the one end surface of the linear core 2 to perform and the light receiving element 5 connected to the other end surface of the linear core 2 are provided.
  • the sheet-like optical waveguide W, the light emitting element 4 and the light receiving element 5 are provided on the surface of a rigid plate 7 such as a resin plate or a metal plate.
  • a protective sheet S made of resin or the like is placed on the surface of the over clad layer 3.
  • the arithmetic average roughness Ra of the contact surface (back surface) with the overcladding layer 3 is set to 10 ⁇ m or more
  • the arithmetic average roughness Ra of the opposite surface (front surface) is set in this embodiment.
  • FIG. 1B the rough surfaces of the front and back surfaces of the over clad layer 3 are exaggerated for easy understanding.
  • 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 surface portion of the sheet-like optical waveguide W corresponding to the lattice-shaped core 2 portion (the surface portion of the over clad layer 3 in this embodiment) It is a great feature of the present invention to place the protective sheet S in which the arithmetic average roughness Ra of the contact surface with the over clad layer 3 is set to 10 ⁇ m or more.
  • the input portion (pressing portion) in the protective sheet S is prevented from sticking to the surface of the over clad layer 3. Can detect the input position normally (as input).
  • FIG. 2A when characters or the like are input from the surface of the protective sheet S with a writing instrument such as a pen, the writing pressure by the pen tip 10a or the like is exceeded via the protective sheet S.
  • the sheet-shaped optical waveguide W is pressed through the cladding layer 3.
  • the protective sheet S is recessed together with the sheet-like optical waveguide W.
  • the core 2 is deformed at the pressed portion by the pen tip 10a and the like, the propagation of light inside the core 2 is hindered, and the detection level of light at the light receiving element 5 is lowered. Is detected.
  • the input portion (pressing portion) in the protective sheet S is not attached to the surface of the over clad layer 3 as described above.
  • the protective sheet S normally has a restoring force, but even if it does not have a restoring force, it uses the restoring force of the sheet-like optical waveguide W to quickly return to the original flat state as described above. Return to. Thereby, the said position sensor can be quickly prepared for the next input (press).
  • the protective sheet S has an arithmetic average roughness Ra of a contact surface (back surface) with the over clad layer 3 set to 10 ⁇ m or more. It has become.
  • the arithmetic average roughness Ra is preferably set to 40 ⁇ m or less.
  • the arithmetic average roughness Ra may be set by a polishing process, or a sheet material set in advance to such an arithmetic average roughness Ra may be purchased and used as the protective sheet S. .
  • the thickness of the protective sheet S is preferably set in the range of 15 to 200 ⁇ m from the viewpoint of properly detecting input. If the thickness is too thin, it tends to be difficult to set the arithmetic average roughness Ra, and if it is too thick, the sensitivity for detecting input (pressing) tends to decrease.
  • Examples of the material for forming the protective sheet S include resins such as PET (polyethylene terephthalate), PI (polyimide), and PEN (polyethylene naphthalate), rubbers such as silicone rubber and acrylic rubber, and metals such as stainless steel and aluminum. Or paper.
  • resins such as PET (polyethylene terephthalate), PI (polyimide), and PEN (polyethylene naphthalate), rubbers such as silicone rubber and acrylic rubber, and metals such as stainless steel and aluminum. Or paper.
  • the sheet-like optical waveguide W has a lattice-like core 2 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.
  • 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.
  • the sheet-like optical waveguide W having such a structure can easily detect the pressing position in the input region because the over clad layer 3 can have a uniform thickness.
  • 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.
  • Examples of the material for forming the core 2, the under cladding layer 1 and the over cladding layer 3 include photosensitive resin, thermosetting resin, and the like, and the sheet-like optical waveguide W is manufactured by a manufacturing method corresponding to the forming material. Can do.
  • 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 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.
  • the elastic modulus of the core 2 is preferably set 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 sheet shape has a considerably larger area than the area of the pen tip 10a or the like that presses the input region portion of the over clad layer 3. This is because the portion of the optical waveguide W 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 clad layer 3 is set within a range of 0.1 GPa or more and less than 10 GPa.
  • the elastic modulus of the cladding layer 1 is preferably set within the range of 0.1 to 1 GPa.
  • the elastic modulus of the core 2 is large, the core 2 is hardly crushed by a normal pressing force (the cross-sectional area of the core 2 hardly changes), but the core 2 sinks into the under cladding layer 1 by the pressing. 2 (see FIG. 2A), light leakage (scattering) occurs from the bent portion of the core 2 corresponding to the recessed portion.
  • the light receiving element 5 [FIG. Since the light detection level in [Ref.] Decreases, the pressed position can be detected.
  • the arithmetic average roughness Ra of the protective sheet S is set to be the same on the contact surface (back surface) with the over clad layer 3 and on the opposite surface (front surface). If the arithmetic average roughness Ra of the contact surface (back surface) is set to 10 ⁇ m or more, the arithmetic average roughness Ra of the opposite surface (front surface) is an arbitrary value regardless of the arithmetic average roughness Ra of the back surface. It's okay.
  • lattice-like core 2 is normally formed in the state where all the four directions which cross
  • Others are acceptable.
  • only one intersecting direction may be divided by the gap G to be 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 are discontinuous.
  • the three intersecting directions may be discontinuous, or as shown in FIG. 3 (f), all the four intersecting directions may be discontinuous. It may be discontinuous.
  • FIGS. 3B to 3F if at least one intersecting direction is discontinuous, light crossing loss can be reduced. That is, as shown in FIG. 4 (a), in an intersection where all four intersecting directions are continuous, if one of the intersecting directions [upward in FIG. 4 (a)] is focused, 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 is transmitted through the core 2 because the reflection angle on the wall surface is large [two points in FIG. (See chain line arrow). Such light transmission also occurs in a direction opposite to the above intersecting direction (downward in FIG. 4A). On the other hand, as shown in FIG.
  • the rigid plate 7 is provided to support the sheet-like optical waveguide W or the like, but the rigid plate 7 may not be provided. In that case, the input is performed in a state where the sheet-like optical waveguide W of the position sensor is placed on a hard flat table such as a table.
  • an elastic layer such as a rubber layer may be provided on the back surface of the under cladding layer 1.
  • the elastic layer Using the elastic force, the weak restoring force is assisted, and after the pressing by the pen tip 10a or the like is released, the original state can be restored.
  • Component a 75 parts by weight of an epoxy resin (Mitsubishi Chemical Corporation, YL7410).
  • Component b 25 parts by weight of an epoxy resin (manufactured by Mitsubishi Chemical Corporation, JER1007).
  • Component c 2 parts by weight of a photoacid generator (manufactured by Sun Apro, CPI101A).
  • Component d 75 parts by weight of an epoxy resin (manufactured by Daicel Corporation, EHPE3150).
  • Component e 25 parts by weight of epoxy resin (KI-3000-4, manufactured by Tohto Kasei Co., Ltd.)
  • 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 over clad layer was formed on the surface of the glass substrate by spin coating using the over clad layer forming material.
  • the over cladding layer had a thickness of 25 ⁇ m, an elastic modulus of 3 MPa, and a refractive index of 1.503.
  • the elastic modulus was measured using a viscoelasticity measuring device (TA Instruments Japan Inc., RSA3).
  • the core had a thickness of 100 ⁇ m, the core width of the lattice portion was 100 ⁇ m, the pitch was 600 ⁇ m, the elastic modulus was 2 GPa, and the refractive index was 1.523.
  • an under clad layer was formed on the surface of the over clad layer by spin coating using the under clad layer forming material so as to cover the core.
  • the thickness of the under cladding layer was 500 ⁇ m, the elastic modulus was 3 MPa, and the refractive index was 1.503.
  • Example 1 [Production of position sensor] Thereafter, a sheet material made of PET (Eigami Industry Co., Ltd., Z mat film: thickness 50 ⁇ m, arithmetic average roughness Ra 35.1 ⁇ m on the front and back surfaces) was directly placed on the surface of the over clad layer as a protective sheet. In addition, arithmetic average roughness Ra was measured using the laser microscope (Lasertec company make, OPTELICS H300).
  • a light emitting element (Optowell, XH85-S0603-2s) is connected to one end face of the core, and a light receiving element (Hamamatsu Photonics, s10226) is connected to the other end face of the core.
  • a position sensor was prepared.
  • Example 2 A sheet material made of PET (manufactured by Unitika Ltd., Emblet AT: thickness 38 ⁇ m) was prepared, and one surface thereof was polished with sandpaper of No. 800 and set to arithmetic average roughness Ra 12.4 ⁇ m. Then, the polished sheet material was used as a protective sheet, and the polished surface was placed in contact with the surface of the over clad layer. The other parts were the same as in Example 1.
  • Example 3 A sheet material made of PET (manufactured by Mitsubishi Chemical HD, Diafoil S100: thickness 50 ⁇ m) was prepared, and one side thereof was polished with an 800th sandpaper, and the arithmetic average roughness Ra was set to 10.5 ⁇ m. Then, the polished sheet material was used as a protective sheet, and the polished surface was placed in contact with the surface of the over clad layer. The other parts were the same as in Example 1.
  • Example 1 In the position sensor of Example 2, the sheet material was placed on the surface of the over clad layer as a protective sheet without being polished. The arithmetic average roughness Ra of the front and back surfaces of the sheet material (protective sheet) was 5.9 ⁇ m. The other parts were the same as in Example 2.
  • Example 2 In the position sensor of Example 3, the sheet material was placed on the surface of the over clad layer as it was as a protective sheet without polishing. The arithmetic average roughness Ra of the front and back surfaces of the sheet material (protective sheet) was 3.1 ⁇ m. The other parts were the same as in Example 3.
  • the position sensor of the present invention can be used to detect the input position normally (as input) when inputting characters or the like with a writing instrument such as a pen.

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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

L'invention concerne un capteur de position apte à détecter une position d'entrée normalement (exactement telle qu'entrée) même si une surface est équipée d'un film de protection. Le capteur de position de la présente invention comprend : un guide d'ondes optique (W) en forme de feuille dans lequel une grille de cœurs (2) sont pris en sandwich entre une couche intérieure en forme de feuille (1) et une couche superposée (3) ; un élément d'électroluminescent (4) connecté à une surface d'extrémité de cœurs linéaires (2) qui forment la grille de cœurs (2) ; et un élément de réception de lumière (5) connecté à l'autre surface d'extrémité des cœurs linéaires (2). Un film de protection (S) comprenant une résine est positionné sur la couche superposée (3), et la rugosité moyenne arithmétique Ra de la surface du film de protection (S) en contact avec la couche superposée (3) est réglée de façon à être supérieure ou égale à 10 µm.
PCT/JP2015/060791 2014-04-17 2015-04-07 Capteur de position WO2015159754A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2014-085459 2014-04-17
JP2014085459A JP2015207046A (ja) 2014-04-17 2014-04-17 位置センサ

Publications (1)

Publication Number Publication Date
WO2015159754A1 true WO2015159754A1 (fr) 2015-10-22

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PCT/JP2015/060791 WO2015159754A1 (fr) 2014-04-17 2015-04-07 Capteur de position

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JP (1) JP2015207046A (fr)
TW (1) TW201543274A (fr)
WO (1) WO2015159754A1 (fr)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH03256111A (ja) * 1990-03-06 1991-11-14 Fujitsu Ltd 光学式座標入力装置
JPH08234895A (ja) * 1995-02-27 1996-09-13 Canon Inc 座標入力方法及びその装置
WO2010024008A1 (fr) * 2008-08-29 2010-03-04 シャープ株式会社 Détecteur de coordonnées, dispositif électronique, dispositif d'affichage et unité de réception lumineuse

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH03256111A (ja) * 1990-03-06 1991-11-14 Fujitsu Ltd 光学式座標入力装置
JPH08234895A (ja) * 1995-02-27 1996-09-13 Canon Inc 座標入力方法及びその装置
WO2010024008A1 (fr) * 2008-08-29 2010-03-04 シャープ株式会社 Détecteur de coordonnées, dispositif électronique, dispositif d'affichage et unité de réception lumineuse

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JP2015207046A (ja) 2015-11-19
TW201543274A (zh) 2015-11-16

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