WO2015151858A1 - Capteur de position - Google Patents

Capteur de position Download PDF

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Publication number
WO2015151858A1
WO2015151858A1 PCT/JP2015/058468 JP2015058468W WO2015151858A1 WO 2015151858 A1 WO2015151858 A1 WO 2015151858A1 JP 2015058468 W JP2015058468 W JP 2015058468W WO 2015151858 A1 WO2015151858 A1 WO 2015151858A1
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WIPO (PCT)
Prior art keywords
core
optical waveguide
layer
elastic
cladding layer
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PCT/JP2015/058468
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English (en)
Japanese (ja)
Inventor
良真 吉岡
裕介 清水
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日東電工株式会社
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Publication of WO2015151858A1 publication Critical patent/WO2015151858A1/fr

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    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G59/00—Polycondensates containing more than one epoxy group per molecule; Macromolecules obtained by polymerising compounds containing more than one epoxy group per molecule using curing agents or catalysts which react with the epoxy groups
    • C08G59/18—Macromolecules obtained by polymerising compounds containing more than one epoxy group per molecule using curing agents or catalysts which react with the epoxy groups ; e.g. general methods of curing
    • C08G59/20—Macromolecules obtained by polymerising compounds containing more than one epoxy group per molecule using curing agents or catalysts which react with the epoxy groups ; e.g. general methods of curing characterised by the epoxy compounds used
    • 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

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.
  • a position sensor using an optical waveguide in order to increase the pressure detection sensitivity, it is necessary to form a thin core so that the core can be quickly crushed.
  • the core is thin, there is little light propagating in the core, and even if the light detection level at the light receiving element decreases due to pressing, the degree of the decrease is small, so the light receiving element cannot sense it and press May not be detected. That is, the conventional position sensor cannot sufficiently increase the pressure detection sensitivity.
  • the thickness of the optical waveguide of the position sensor is generally very thin, about 1 mm or less, when the optical waveguide is in direct contact with a hard object such as a desk, It is difficult to dent.
  • the optical waveguide is required to be recessed with a small pressing force.
  • 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 has excellent detection sensitivity for pressing, and the optical waveguide is recessed with a small pressing force, and even when a strong pressing with a load 13N is applied, the optical waveguide
  • An object of the present invention is to provide a position sensor in which the core and the undercladding layer are not plastically deformed and can be quickly restored to the original shape when the pressure is released.
  • 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 sensor 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, wherein the optical waveguide is the following ( A surface portion of the optical waveguide that satisfies A) to (D), is received by the light receiving element through the core of the optical waveguide, and corresponds to the lattice-shaped core portion.
  • the elastic modulus of the core is set to be larger than the elastic modulus of the under-cladding layer and the elastic modulus of the over-cladding layer, and in the pressed state of the surface of the sheet-like optical waveguide, The deformation rate of the cross section is smaller than the deformation rates of the cross sections of the over cladding layer and the under cladding layer.
  • the ratio (T / L) between the thickness (T) and the width (L) of the core is 2 or more.
  • An elastic layer having a durometer hardness of 20 to 40 and a rebound resilience of 70% or more is provided on the back surface portion of the optical waveguide corresponding to the lattice-shaped core portion.
  • the core is set in an elastic region in the range of 3 to 10% tensile elongation, and the undercladding layer supporting the core is set in the elastic region in the range of 5 to 140% tensile elongation. Yes.
  • the “deformation rate” in the above (A) is the ratio of the amount of change of each thickness at the time of pressing to the thickness before pressing of the core, the over cladding layer and the under cladding layer in the pressing direction.
  • the present inventors first conducted research on light propagation in the deformed portion of the core.
  • the core is not crushed by the above-mentioned pressing, rather than the core being crushed by the pressing as in the past. Therefore, the elastic modulus of the core was set to be larger than the elastic modulus of the under cladding layer and the over cladding layer. Then, the over clad layer was deformed so as to be crushed in the pressing direction, and the core was bent so as to sink into the under clad layer with almost no change in the cross-sectional shape (almost no crushed). And it was found that light leakage (scattering) from the core occurs due to the bending of the core.
  • the pressing position can be detected by increasing the elastic modulus of the core and preventing the core from being crushed by pressing so that the core is bent by pressing.
  • the present inventors conducted research on light leakage (scattering) at the portion where the core is bent as described above. As a result, it has been found that the thicker the core thickness (T), the easier it is for light to leak (easy to scatter).
  • the ratio (T / L) of the core thickness (T) to the width (L) is set to 2 or more, the core thickness (T) becomes relatively thick with respect to the width (L). Thus, it was found that light easily leaks (is easily scattered) at the portion where the core is bent as described above by pressing.
  • the inventors of the present invention are configured such that when the optical waveguide is recessed with a small pressing force and the pressing is released, the optical waveguide quickly recovers to the original shape. Therefore, the idea was to provide an elastic layer on the back surface of the optical waveguide. That is, by utilizing the elasticity of the elastic layer, it is easy to dent as described above, and the shape recovery is accelerated. And in order to optimize the characteristic, research was repeated about the hardness and rebound resilience of the elastic layer.
  • the durometer hardness of the elastic layer is set to a low value in the range of 20 to 40 and the rebound resilience of the elastic layer is set to a high value of 70% or more, the optical waveguide on the elastic layer is reduced in size. It was found that the optical waveguide quickly recovered to its original shape when the pressure was depressed and the pressure was released.
  • the inventors of the present invention are such that even when the above-described pressing is a strong pressing with a load of 13 N, the core and the under cladding layer of the optical waveguide are not plastically deformed, and when the pressing is released, the original shape is quickly recovered. Therefore, research was repeated focusing on the tensile elongation of the core and the undercladding layer.
  • 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 elastic modulus of the linear core is set to be larger than the elastic modulus of the under cladding layer and the over cladding layer, the core and the under cladding layer are set to a specific elastic region, and It was found that the intended purpose was achieved by forming a thick core and providing an elastic layer having a specific durometer hardness and rebound resilience on the back surface of the optical waveguide.
  • the elastic modulus of the core is set larger than the elastic modulus of the under cladding layer and the elastic modulus of the over cladding layer. Therefore, when the surface of the over clad layer of the optical waveguide is pressed, the deformation rate of the cross section of the core in the pressing direction is smaller than the deformation rate of the cross section of the over clad layer and the under clad layer, and the core is almost crushed. And can be bent so as to sink into the undercladding layer. Since the ratio (T / L) of the core thickness (T) to the width (L) is set to 2 or more, the core thickness (T) is relatively set to the width (L). Light is easily leaked (scattered) at a thick portion where the core is bent as described above by pressing. Therefore, the position sensor of the present invention has excellent pressure detection sensitivity.
  • an elastic layer is provided on the back surface portion of the optical waveguide corresponding to the lattice-shaped core portion, and the durometer hardness of the elastic layer is set to be as low as 20 to 40. ing. Therefore, when the surface portion of the optical waveguide corresponding to the lattice-shaped core portion, which is the input region, is pressed, the optical waveguide is easily recessed in the pressing direction even if the pressing force is small. That is, also in this respect, the position sensor of the present invention is excellent in pressing detection sensitivity. Furthermore, the elastic layer has a high impact resilience of 70% or higher. Therefore, when the pressing is released, the optical waveguide quickly recovers to the original flat shape, and can be quickly prepared for the next pressing. That is, the position sensor of the present invention is excellent in continuous detection of the pressed position.
  • 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 3 to 10% in tensile elongation.
  • the undercladding layer is set in an elastic range of 5 to 140% in 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, also in this respect, the position sensor of the present invention can be quickly prepared for the next pressing, and is excellent in continuous detection of the pressing position.
  • the position sensor of the present invention is excellent in press detection sensitivity and continuous detection while being thinned.
  • 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 core forming material is a resin composition in which an epoxy resin containing 70 to 100% by weight of an epoxy resin having a softening point of 70 to 130 ° C. as a main component and an epoxy equivalent of 100 to 1200 g / eq is prepared.
  • the epoxy equivalent is as low as 100 to 1200 g / eq
  • the main component epoxy resin is an epoxy resin having a high softening point of 70 to 130 ° C. Since it is contained in a large amount of 70 to 100% by weight, the forming material hardly flows when the core is formed. Therefore, a core having a ratio (T / L) of 2 or more between the thickness (T) and the width (L) has an appropriate shape.
  • 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), (b) is an expanded sectional view which shows typically the reflection angle of the light in the part where the core bent.
  • (A)-(e) is explanatory drawing which shows typically the manufacturing method of the optical waveguide with an elastic layer. 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 on the surface of a rectangular sheet-shaped underclad layer 1 and covered with an overclad layer 3, and the optical waveguide W
  • the elastic layer R provided on the back surface of the under-cladding layer 1, the light emitting element 4 connected to one end face of the linear core 2 constituting the lattice-like core 2, and the other end face of the linear core 2
  • a light receiving element 5 connected to the.
  • the light emitted from the light emitting element 4 passes through the core 2 and is received by the light receiving element 5. And 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 elastic modulus of the core 2 is set to be larger than the elastic modulus of the under cladding layer 1 and the elastic modulus of the over cladding layer 3.
  • the elastic layer R has a durometer hardness as low as 20 to 40 and a rebound resilience as high as 70% or more. This is also one of the major features of the present invention.
  • the low durometer hardness of the elastic layer R is used to press the input region.
  • the optical waveguide W is easily dented, and when the pressure is released, the optical waveguide W quickly recovers to its original flat shape by utilizing the high resilience modulus of the elastic layer R. ing.
  • 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. This is also one of the major features of the present invention. Since the optical waveguide W includes the core 2 and the under cladding layer 1, the core 2 and the under cladding layer 1 maintain elasticity even when a strong pressing load of 13N is applied to the input region. When it is deformed in a state and the pressing is released, the original shape can be quickly recovered by its own restoring force.
  • the core 2 is preferably in the elastic region in the range of 5 to 10% tensile elongation, and 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. Therefore, when the pressing is released, the pressing trace can be quickly removed from the surface of the optical waveguide W (the surface of the over clad layer 3).
  • the detection of the pressing position by the position sensor is performed in a state where the position sensor is placed so that the elastic layer R is in contact with the surface of a hard object such as the desk 30 as shown in a sectional view in FIG.
  • the pressing position is detected.
  • the core 2 bends so as to sink into the undercladding layer 1 with almost no change in the cross-sectional shape (without being almost crushed).
  • light leakage (scattering) from the core occurs due to the bending.
  • the light detection level at the light receiving element 5 is reduced, and the pressed position by the pen tip 10a or the like can be detected from the reduction in the light detection level.
  • the pressing position may be detected on the surface of the input area via a resin film, paper, or the like.
  • the gap between the adjacent linear cores 2 can be set narrow. Furthermore, when the width (L) of the linear cores 2 is set to be thin, the arrangement density of the linear cores 2 can be increased, and the position accuracy of the detected pressed position can be increased.
  • the plurality of linear cores 2 includes a relay portion from the light emitting element 4 to the lattice portion, and a light receiving element from the lattice portion.
  • Up to 5 relay portions are arranged along the outer periphery of the lattice-like portion.
  • the gap between the adjacent linear cores 2 is set to be narrow and the width (L) of the core is set to be narrow, whereby the lattice shape is set.
  • the width of the relay part (frame-like part) arranged on the outer periphery of the part can be reduced, and the space of the position sensor can be saved.
  • the width of the relay portion in which 247 cores 2 are arranged in parallel from the lattice-shaped portion to the light receiving element 5 can be very narrow, about 3 cm in this embodiment.
  • the core 2 is thick (see the enlarged sectional view of FIG. 3A) and thin (see the enlarged sectional view of FIG. 3B). ].
  • the reflection angle ⁇ of the light shown by a chain line
  • the aspect ratio (T / L) between the thickness (T) and the width (L) of the core 2 is set to be 2 or more in order to increase the pressure detection sensitivity. This is also one of the major features of the present invention.
  • the position sensor has excellent pressure detection sensitivity.
  • the optical waveguide W recovers to an original flat shape rapidly using the high impact resilience rate of the elastic layer R. Therefore, the position sensor can be quickly prepared for the next pressing, and is excellent in continuous detection of the pressing position.
  • the core 2 and the under cladding layer 1 are elastic due to the specific elastic regions of the core 2, the under cladding layer 1 and the over cladding layer 3. Recessed while maintaining.
  • the optical waveguide W quickly recovers to the original flat shape by the specific elastic regions of the core 2, the under cladding layer 1 and the over cladding layer 3 as described above. Yes. Therefore, also in this respect, the position sensor can be quickly prepared for the next pressing, and is excellent in continuous detection of the pressing position.
  • the elastic modulus of the core 2 is preferably in the range of 1 GPa to 10 GPa, more preferably in the range of 2 GPa to 5 GPa. If the elastic modulus of the core 2 is too small, the core 2 may be crushed by the pressure of the pen tip 10a or the like due to the shape of the pen tip 10a or the like, and the position of the pen tip 10a or the like may not be detected properly. On the other hand, if the elastic modulus of the core 2 is too high, the core 2 may not bend sufficiently due to the pressure of the pen tip 10a or the like. Therefore, light leakage (scattering) from the core 2 does not occur, and the light detection level at the light receiving element 5 does not decrease, so that the position of the pen tip 10a may not be detected properly.
  • the elastic modulus of the over clad layer 3 is preferably in the range of 0.1 MPa to less than 10 GPa, more preferably in the range of 1 MPa to less than 5 GPa. If the elastic modulus of the overcladding layer 3 is too small, the overcladding layer 3 is too soft and may be damaged by the pressure of the pen tip 10a due to the shape of the pen tip 10a or the like, and the core 2 cannot be protected. On the other hand, when the elastic modulus of the over clad layer 3 is too high, the core 2 is crushed and the position of the pen tip 10a or the like cannot be detected properly even if the pen tip 10a or the like is pressed.
  • the elastic modulus of the under cladding layer 1 is preferably in the range of 0.1 MPa to 1 GPa, more preferably in the range of 1 MPa to 100 MPa. If the elastic modulus of the underclad layer 1 is too small, the undercladding layer 1 is too soft and may not be continuously performed after being pressed with the pen tip 10a or the like and not returned to its original state. On the other hand, if the elastic modulus of the undercladding layer 1 is too high, even if the pen tip 10a or the like is pressed, it does not deform so as to be crushed, and the core 2 may be crushed and the position of the pen tip 10a or the like may not be detected properly.
  • Examples of the material for forming the core 2, the under cladding layer 1 and the over cladding layer 3 having the above-described 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.
  • the material for forming the core 2 is, for example, an epoxy resin having a softening point in the range of 70 to 130 ° C. in the range of 70 to 100 from the viewpoint of facilitating formation of the aspect ratio of 2 or more as described above.
  • a resin composition containing an epoxy resin contained in the range of% by weight as the main component and having an epoxy equivalent in the range of 100 to 1200 g / eq is preferred. That is, when the epoxy equivalent is low in the range of 100 to 1200 g / eq, the forming material is rapidly cured during core formation, and the main component epoxy resin has a high softening point in the range of 70 to 130 ° C.
  • a more preferable material for forming the core 2 is mainly composed of an epoxy resin containing an epoxy resin having a softening point of 70 to 100 ° C. within a range of 80 to 100% by weight, and an epoxy equivalent of 100 to 400 g / eq. It is the resin composition prepared in the inside.
  • the said main component means the component which occupies the majority of the whole formation material of the core 2, and is the meaning including the case where the whole consists only of a main component.
  • examples of the material for forming the elastic layer R having the above-described characteristics include silicone rubber and epoxy rubber.
  • the thickness of the elastic layer R is set within a range of 0.02 to 2.00 mm from the viewpoint of making the dent and shape recoverability of the optical waveguide W better while reducing the thickness of the elastic layer R itself. It is preferred that The reason is that if the elastic layer R is too thin, the effects of the dent and shape recovery of the optical waveguide W tend to be small. Even if the elastic layer R is too thick, the dent and shape of the optical waveguide W are recoverable. This is because the effect of is not sufficiently improved and tends to be excessive quality.
  • 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 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, and the optical waveguide W is manufactured.
  • an elastic layer R is formed on the upper surface of the under cladding layer 1. Thereafter, as shown in FIG.
  • the obtained structure is turned upside down so that the elastic layer R is on the lower side and the over clad layer 3 is on the upper side.
  • the optical waveguide W provided with the elastic layer R is obtained.
  • the under-cladding layer 1, the core 2, the over-cladding layer 3, and the elastic layer R are manufactured by a manufacturing method corresponding to each forming material.
  • FIG. 5 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 of the intersecting portions of the lattice-like core 2 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.
  • 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.
  • the three intersecting directions may be discontinuous, or as shown in FIG. 6 (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. 7 (a), in an intersection where all four intersecting directions are continuous, if one of the intersecting directions (upward in FIG. 7 (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 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 transmission of light also occurs in the direction opposite to the above (downward in FIG. 7A).
  • FIG. 7B when one intersecting direction (the upward direction in FIG.
  • the elastic layer R is provided on the back surface of the undercladding layer 1.
  • the undercladding layer 1 is made of the same material as that of the elastic layer R, and the undercladding layer 1 is elastic. You may treat the laminated body which consists of the layer R as one layer.
  • 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.
  • a photoacid generator manufactured by ADEKA, Sp-170
  • ethyl lactate manufactured by Wako Pure Chemical Industries, Ltd., solvent
  • the softening point of the core-forming epoxy resin was determined by the ring and ball method using an automatic softening point tester (Tanaka Kagaku Kogyo Seisakusho, ASP-5).
  • the epoxy equivalent after preparation of the core-forming material was determined by potentiometric titration using a potentiometric titrator (manufactured by Kyoto Electronics Co., Ltd., AT-610). The results are shown in Table 1 below.
  • an over clad layer was formed on the surface of a glass substrate by spin coating using the above clad forming material.
  • a lattice-like core was formed on the surface of the over clad layer by the photolithography method using the core forming material.
  • 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.
  • an elastic layer was formed on the surface of the under cladding layer by heating using the elastic layer forming material. Thereafter, the over clad layer was peeled off from the glass substrate.
  • the elastic layer was bonded to the surface of the aluminum plate via an adhesive.
  • optical waveguides with elastic layers of Examples 1 to 7 and Comparative Examples 1 to 5 were produced on the surface of an aluminum plate via an adhesive.
  • These optical waveguides with an elastic layer include any one of the implementation optical waveguides 1 to 5 and the comparison optical waveguides 1 and 2 in Table 1 above, and any one of the implementation elastic layers 1 to 4 and the comparison elastic layers 1 to 3 in Table 2 above.
  • the combinations are shown in Tables 3 and 4 below.
  • the dimensions and elastic modulus of the core and the like in the optical waveguide with elastic layer are shown in Tables 3 and 4 below.
  • a light emitting element (Optowell, XH85-S0603-2s) is connected to one end face of the core of the optical waveguide with the elastic layer, and a light receiving element (Hamamatsu Photonics, s10226) is connected to the other end face of the core.
  • the position sensors of Examples 1 to 7 and Comparative Examples 1 to 5 were produced.
  • CMOS scan speed those whose recovery time is less than 7.1 ms are evaluated as being excellent in continuous detection (shape recovery) of the position sensor, and those whose recovery time is 7.1 ms or more.
  • the evaluation was evaluated as inferior to the continuous detection (shape recoverability) of the position sensor.
  • Comparative Example 1 the light reception spectrum did not recover even after a lapse of time, and the depression due to pressing did not recover to the original shape. This is because the durometer hardness and the rebound resilience of the elastic layer are too low. In Comparative Examples 4 and 5, plastic deformation was caused by applying the load, and the shape did not recover even when the load was released. The reason is that in Comparative Example 4, the tensile elongation of the core in the elastic region is too low, and in Comparative Example 5, the tensile elongation of the under cladding layer in the elastic region is too low.
  • the position sensors of Examples 1 to 7 are superior in pressure detection sensitivity, dent property, continuous detection (shape recovery property), and elasticity maintaining property. It can be seen that one of the position sensors 1 to 5 is inferior. The difference in the results depends on either the durometer hardness and the rebound resilience of the elastic layer, the tensile elongation in the elastic region of the core and the cladding, and the thickness of the core.
  • the width (L) of the linear core is actually less than 20 ⁇ m and the gap between adjacent cores is less than 20 ⁇ m.
  • an optical waveguide having a high core arrangement density in which the aspect ratio (T / L) between the core thickness (T) and the width (L) is 2 or more could be produced.
  • the formation state of the core was confirmed with an optical microscope after the core was formed.
  • Example 1 to 7 the detection sensitivity (dentation) and continuous detection (shape recovery) were evaluated with paper placed on the surface of the input region of the position sensor via a PET film. However, even when the PET film and paper were not placed, evaluation results showing the same tendency as in Examples 1 to 7 were obtained.
  • Examples 1 to 7 the optical waveguide is shown in a sectional view in FIG. 1B, but the optical waveguide is shown in the sectional view in FIG. 5 as in Examples 1 to 7. An evaluation result showing the tendency was obtained.
  • the position sensor of the present invention detects the pressed position, the position accuracy of the detected pressed position is increased, the detection sensitivity of the pressed pressure is increased, and the continuous detection is improved by quickly eliminating the pressing marks. Is available.

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Abstract

La présente invention concerne un capteur de position qui excelle en termes de précision des positions de contact détectées et de sensibilité de détection de contact, dans lequel même si un guide d'onde optique fléchit sous une faible force de contact et même si un contact énergique présentant une charge de 13 N est appliqué, des cœurs dans ledit guide d'onde optique et une sous-couche de gainage ne subissent pas de déformation plastique et reprennent rapidement leurs formes originales lorsque ledit contact est rompu. Dans ce capteur de position, la surface inférieure d'un guide d'onde optique (W), dans lequel un treillis de cœurs (2) est soutenu par une sous-couche de gainage (1) du type feuille et recouvert par une sur-couche de gainage (3), est pourvue d'une couche élastique (R) qui présente une dureté au duromètre comprise entre 20 et 40 inclus et une élasticité de rebondissement d'au moins 70 %, et un élément électroluminescent (4) et un élément récepteur de lumière (5) sont connectés aux faces d'extrémité des cœurs (2). Les modules élastiques des cœurs (2) sont supérieurs à ceux des couches de gainage (1 et 3), et le rapport épaisseur/largeur de chaque cœur (2) est supérieur ou égal à 2 : 1. Les cœurs (2) sont conçus de manière à avoir une plage d'élasticité sur des allongements en traction de 3 % à 10 %, et la sous-couche de gainage (1) est conçue de manière à avoir une plage d'élasticité sur des allongements en traction de 5 % à 140 %.
PCT/JP2015/058468 2014-04-03 2015-03-20 Capteur de position WO2015151858A1 (fr)

Applications Claiming Priority (2)

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JP2014-076895 2014-04-03
JP2014076895A JP2015197880A (ja) 2014-04-03 2014-04-03 位置センサ

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WO2015151858A1 true WO2015151858A1 (fr) 2015-10-08

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Cited By (1)

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CN109885375A (zh) * 2019-03-05 2019-06-14 百度在线网络技术（北京）有限公司 一种列表滑动显示方法及移动终端

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113301753B (zh) * 2021-06-01 2024-09-13 Oppo广东移动通信有限公司 盖板的制备方法、盖板以及电子设备

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Publication number Priority date Publication date Assignee Title
JPH1091348A (ja) * 1996-09-19 1998-04-10 Toshiba Corp 座標入力装置および液晶表示装置
JP2008181411A (ja) * 2007-01-25 2008-08-07 Nitto Denko Corp タッチパネル用光導波路
JP2013073276A (ja) * 2011-09-26 2013-04-22 Nitto Denko Corp 入力デバイス

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH1091348A (ja) * 1996-09-19 1998-04-10 Toshiba Corp 座標入力装置および液晶表示装置
JP2008181411A (ja) * 2007-01-25 2008-08-07 Nitto Denko Corp タッチパネル用光導波路
JP2013073276A (ja) * 2011-09-26 2013-04-22 Nitto Denko Corp 入力デバイス

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109885375A (zh) * 2019-03-05 2019-06-14 百度在线网络技术（北京）有限公司 一种列表滑动显示方法及移动终端
CN109885375B (zh) * 2019-03-05 2022-03-08 百度在线网络技术（北京）有限公司 一种列表滑动显示方法及移动终端

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TW201543310A (zh) 2015-11-16

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