WO2015056474A1 - 位置センサの製法およびそれによって得られた位置センサ - Google Patents
位置センサの製法およびそれによって得られた位置センサ Download PDFInfo
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- WO2015056474A1 WO2015056474A1 PCT/JP2014/069291 JP2014069291W WO2015056474A1 WO 2015056474 A1 WO2015056474 A1 WO 2015056474A1 JP 2014069291 W JP2014069291 W JP 2014069291W WO 2015056474 A1 WO2015056474 A1 WO 2015056474A1
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- position sensor
- photosensitive resin
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Classifications
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- G—PHYSICS
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- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
- G01D5/26—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light
- G01D5/32—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light
- G01D5/34—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells
- G01D5/353—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells influencing the transmission properties of an optical fibre
- G01D5/3537—Optical fibre sensor using a particular arrangement of the optical fibre itself
- G01D5/3538—Optical fibre sensor using a particular arrangement of the optical fibre itself using a particular type of fiber, e.g. fibre with several cores, PANDA fiber, fiber with an elliptic core or the like
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- 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
- G02B6/13—Integrated optical circuits characterised by the manufacturing method
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- G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
- G03F7/00—Photomechanical, e.g. photolithographic, production of textured or patterned surfaces, e.g. printing surfaces; Materials therefor, e.g. comprising photoresists; Apparatus specially adapted therefor
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- 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
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- 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
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Definitions
- the present invention relates to a method of manufacturing a position sensor that optically detects a pressed position and a position sensor obtained thereby.
- Patent Document 1 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 core of the pressed part is crushed (the cross-sectional area of the core in the pressing direction is reduced), and In the core, since the detection level of light in the light receiving element is lowered, the vertical and horizontal positions (coordinates) of the pressed portion can be detected.
- the optical path from the light emitting element to the vertical and horizontal portions of the core is substantially linear, and the distance between the two is long, and the position sensor itself requires a large space. It has become a thing.
- This position sensor has a core portion formed in a lattice shape, and the core portion from the light emitting element to the lattice portion and the core portion from the lattice portion to the light receiving element are arranged on the outer periphery of the lattice portion.
- the position sensor is saved in space by being arranged at the peripheral edge of the optical waveguide in a bent state.
- the surface portion of the optical waveguide corresponding to the lattice portion of the core is an input region.
- the outer peripheral portion along the outer periphery of the lattice portion of the core is bent, light may leak (scatter) from the bent portion.
- the bent portion becomes steep (the radius of curvature is small), and the possibility of light leaking (scattering) increases.
- the light detection level at the light receiving element also decreases. In this case, it is impossible to determine whether the decrease in the light detection level is due to pressing at the grid-like part (input area) or the bending part at the other outer peripheral part, so the accurate pressing position is detected. become unable. There is room for improvement in that respect.
- the present invention has been made in view of such circumstances, can save space, and can prevent unnecessary leakage (scattering) of light in a portion other than the lattice portion of the core. It is an object of the present invention to provide a method for manufacturing a position sensor and to provide a position sensor obtained thereby.
- the present invention is patterned into a lattice-shaped portion and an outer peripheral portion that extends from the lattice-shaped portion and is arranged so as to be bent along the outer periphery of the lattice-shaped portion.
- the production of the optical waveguide includes a step of forming a first cladding layer, a step of forming a first photosensitive resin layer for forming a core on the surface of the first cladding layer, and the core formation.
- the first photosensitive resin layer is exposed to a predetermined pattern, and in the region corresponding to the lattice-shaped portion, the portion cured by the exposure is formed in the core for the optical path and corresponds to the outer peripheral portion. In the area to be cured by the above exposure.
- Forming a core portion for the optical path and a dummy core for the non-optical path, and after the exposure, the core and the dummy core composed of the exposed portion of the first photosensitive resin layer for forming the core, and the surface of the unexposed portion A step of coating with a second photosensitive resin layer for forming a second cladding layer, and heating the first and second photosensitive resin layers to thereby form the first photosensitive resin layer for forming the core.
- the manufacturing method of the position sensor provided with the process used as a 3rd clad layer is made into the 1st summary.
- the present invention is a position sensor obtained by the above-described method of manufacturing a position sensor, wherein the region corresponding to the outer peripheral portion arranged in a state bent along the outer periphery of the core-like lattice portion is used for a non-optical path.
- the difference in refractive index between the optical path core and the third cladding layer around the core is larger in the region corresponding to the outer peripheral portion than in the region corresponding to the lattice-shaped portion.
- the position sensor is a second gist.
- the present inventors have arranged the core portion that optically connects the lattice portion and the optical element around the outer periphery of the lattice portion of the core in a bent state so as to be along.
- Research was conducted on the space-saving design in order to prevent light from leaking (not scattering) from parts other than the grid-like part of the core. Therefore, the position of the refractive index difference between the core and the cladding around the core is conceived to be larger in the region corresponding to the outer peripheral portion of the lattice portion than in the region corresponding to the lattice portion. Research on the manufacturing method of the sensor was repeated.
- the resin in the unexposed portion of the first photosensitive resin layer for core formation and the resin in the second photosensitive resin layer for formation of the second cladding layer are mixed by coating with a photosensitive resin layer and heating.
- the mixed layer is exposed and cured to form a third cladding layer, the refractive index difference between the core and the third cladding layer is greater in the region corresponding to the outer peripheral portion than in the lattice-shaped portion. Is larger than the area corresponding to It found that it is possible to prevent leakage (scattering), thereby achieving the present invention.
- the refractive index of the mixed material is a value between the two, which is close to the refractive index on the side where the mixed volume ratio is large. Therefore, in the present invention, the mixed volume ratio of the unexposed portion of the first photosensitive resin layer for forming the core is equal to the lattice-shaped portion because the dummy core is formed in the region corresponding to the outer peripheral portion. Therefore, the refractive index of the third cladding layer is smaller in the region corresponding to the outer peripheral portion than in the region corresponding to the lattice-shaped portion. The value approaches the refractive index of the photosensitive resin layer.
- the refractive index difference between the core and the third cladding layer is larger in the region corresponding to the outer peripheral portion than in the region corresponding to the lattice-shaped portion, and light is unnecessary in the outer peripheral portion. Leakage (scattering) can be prevented.
- the region corresponding to the outer peripheral portion is formed on the photosensitive resin layer.
- the resin of the unexposed portion of the first photosensitive resin layer for forming the core and the second photosensitive resin layer for forming the second cladding layer are formed.
- the resin is mixed to form a mixed layer, in the region corresponding to the outer peripheral portion, the mixed volume ratio of the resin in the unexposed portion for core formation can be reduced.
- the refractive index of the third cladding layer obtained by exposing and curing the mixed layer can be made smaller in the region corresponding to the outer peripheral portion than in the region corresponding to the lattice-shaped portion. Therefore, the refractive index difference between the core and the third cladding layer can be made larger in the region corresponding to the outer peripheral portion than in the region corresponding to the lattice-shaped portion. In addition, the difference in refractive index difference between the regions can be expressed simultaneously. As a result, it is possible to obtain a position sensor that can prevent unnecessary leakage (scattering) of light at the outer peripheral portion, that is, a position sensor that can properly sense the pressed position.
- the position sensor of the present invention is obtained by the above-described position sensor manufacturing method, a non-optical path dummy core is formed in a region corresponding to the outer peripheral portion, and the optical path core and the third cladding around the core are provided.
- the refractive index difference with the layer is larger in the region corresponding to the outer peripheral portion than in the region corresponding to the lattice portion. Therefore, the position sensor of the present invention can prevent unnecessary leakage (scattering) of light at the outer peripheral portion, and can appropriately detect the pressed position.
- FIG. 1 An embodiment of the position sensor of the present invention is schematically shown, wherein (a) is a plan view thereof, (b) is an enlarged sectional view of a central portion thereof, and (c) is an enlarged view of a peripheral portion thereof. It is sectional drawing. (A)-(d) is explanatory drawing which shows typically the manufacturing method of the optical waveguide which comprises the said position sensor. It is an enlarged partial sectional view showing typically the use state of the position sensor. (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. 1A is a plan view showing an embodiment of the position sensor of the present invention
- FIG. 1B is an enlarged view of the cross section of the center portion thereof
- FIG. It is the figure which expanded the cross section of the peripheral part.
- the position sensor of this embodiment includes a rectangular sheet-shaped optical waveguide W, a light emitting element 5, and a light receiving element 6.
- a plurality of linear optical path cores 2 are formed in a lattice shape on the surface of a rectangular sheet-like underclad layer (first clad layer) 1 and arranged in the central portion of the optical waveguide W.
- the outer circumferential portion C is patterned and the outer circumferential portion S that is extended from the grid-like portion C and arranged in a bent state along the outer circumference of the lattice-like portion C.
- a non-optical path dummy core D (not shown in FIG. 1A) made of the same material as that of the core 2 with a gap between the core 2 and the surface of the under cladding layer 1 corresponding to S.
- the over clad layer (third clad layer) 4 is formed on the surface of the under clad layer 1 with the core 2 and the dummy core D covered.
- the refractive index difference between the optical path core 2 and the overcladding layer 4 in contact with the core 2 is larger in the region corresponding to the outer peripheral portion S than in the region corresponding to the lattice portion C. Is also getting bigger.
- the light emitting element 5 is connected to one end surface of the core 2 of the outer peripheral portion S on one side, and the light receiving element 6 is connected to the other end surface of the core 2 of the outer peripheral portion S on the other side.
- the light emitted from the light emitting element 5 passes through the core 2 from the outer peripheral portion S on one side to the outer peripheral portion S on the other side through the lattice portion C.
- Light is received by the light receiving element 6.
- the surface portion of the over clad layer 4 corresponding to the lattice portion C of the 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 substrate 7 (see FIG. 2A) is prepared.
- the material for forming the substrate 7 include glass, metal, resin, quartz, and silicon.
- the under cladding layer 1 is formed on the surface of the substrate 7.
- the under cladding layer 1 can be formed by, for example, a photolithography method using a photosensitive resin as a forming material.
- the thickness of the under cladding layer 1 is set within a range of 20 to 2000 ⁇ m, for example.
- a core-forming photosensitive resin layer (uncured) 2A is formed on the surface of the under-cladding layer 1.
- the formation of the photosensitive resin layer 2A is performed by, for example, a spin coating method, a dipping method, a casting method, an injection method, an ink jet method, or the like.
- the core forming photosensitive resin is made of a material having a higher refractive index than the under cladding layer forming photosensitive resin and the second cladding layer forming photosensitive resin described later.
- the adjustment of the refractive index can be performed by, for example, selecting the type of each photosensitive resin and adjusting the composition ratio.
- the core-forming photosensitive resin layer 2A is exposed to a predetermined pattern through a photomask (not shown) (the exposed portion is indicated by two-dot chain hatching).
- the exposed portion is indicated by two-dot chain hatching.
- the lattice-like portion C of the core 2 left side of FIG. 2B
- the outer peripheral portion S right side of FIG. 2B
- the exposed portion is cured by the exposure and formed on the core 2 and the dummy core D.
- the thicknesses of the core 2 and the dummy core D are set, for example, in the range of 5 to 100 ⁇ m, and the widths of the core 2 and the dummy core D are set, for example, in the range of 5 to 100 ⁇ m.
- the surface of the exposed portion (core 2 and dummy core D) and the unexposed portion (uncured) 2a of the photosensitive resin layer 2A for core formation is formed on the second cladding layer.
- the coating of the photosensitive resin layer 3A is performed in the same manner as the method for forming the photosensitive resin layer 2A for core formation described with reference to FIG.
- a mixed layer 4A is formed as shown in FIG.
- the heat treatment is preferably performed within a range of 100 to 200 ° C. ⁇ 5 to 30 minutes from the viewpoint of mixing so that the components of the mixed layer 4A to be formed become more uniform.
- the temperature of the heat treatment is too low or the time is too short, the mixing becomes insufficient, and the components of the over clad layer 4 obtained by curing the mixed layer 4A in a later step become non-uniform, The light propagation loss of the core 2 increases. If the temperature of the heat treatment is too high or the time is too long, the core 2 may melt.
- the mixed layer 4 ⁇ / b> A is exposed and cured to form the over clad layer 4.
- the over clad layer 4 is in contact with the top surface and side surfaces of the core 2.
- the thickness of the over clad layer 4 is set, for example, within a range of 1 to 200 ⁇ m from the viewpoint of easy detection of the pressed position.
- the optical waveguide W composed of the under cladding layer 1, the core 2, the dummy core D, and the over cladding layer 4 is manufactured on the surface of the substrate 7.
- the optical waveguide W is used in a state where it is formed on the surface of the substrate 7 or is peeled off from the substrate 7. Thereafter, the light emitting element 5 is connected to one end surface of the core 2 of the outer peripheral portion S on one side, and the light receiving element 6 is connected to the other end surface of the core 2 of the outer peripheral portion S on the other side portion. A sensor is obtained.
- the refractive index of the over clad layer 4 is a value between the refractive index of the photosensitive resin layer 2A for forming the core and the refractive index of the photosensitive resin layer 3A for forming the second cladding layer by the mixing.
- the value approaches the refractive index on the side where the mixing volume ratio is large. From this, in the optical waveguide W, since the dummy core D is formed in the region corresponding to the outer peripheral portion S, the mixing volume ratio of the unexposed portion 2a of the photosensitive resin layer 2A for core formation is as described above.
- the refractive index of the overcladding layer 4 is smaller than the region corresponding to the lattice portion C, the refractive index of the overcladding layer 4 is higher in the region corresponding to the outer peripheral portion S than in the region corresponding to the lattice portion C.
- the value approaches the refractive index of the photosensitive resin layer 3A for layer formation. That is, the refractive index difference between the core 2 and the overcladding layer 4 is larger in the region corresponding to the outer peripheral portion S than in the region corresponding to the lattice portion C. Unnecessary leakage (scattering) can be prevented.
- the difference in refractive index between the above regions can be manifested simultaneously (when the over clad layer 4 is formed).
- the side surface of the core 2 may be rough due to exposure through a photomask.
- the rough side surface of the core 2 adversely affects the light propagation in the core 2.
- development is performed after the exposure to dissolve and remove the unexposed portion 2a, so that the side surface roughness of the core 2 remains.
- the optical waveguide W of this embodiment is As described above, the unexposed portion 2a is left without development, and is heated and mixed with the resin of the photosensitive resin layer 3A for forming the second cladding layer. A layer in which both are mixed is formed at the interface with the photosensitive resin layer 3A, and the surface roughness of the side surface of the core 2 is eliminated. Thereby, there is an effect that the loss of light propagation can be reduced.
- the elastic modulus of the core 2 is set larger than the elastic modulus of the under cladding layer 1 and the elastic modulus of the over cladding layer 4.
- the position sensor is placed on a flat table 30 such as a table and the surface portion of the over clad layer 4 (input) corresponding to the lattice portion C of the core 2.
- information such as characters is written by the input body 10 such as a pen.
- the tip input part 10a such as a pen tip.
- the core 2 bends so as to sink into the underclad layer 1 along the tip input portion 10a such as the pen tip at the pressing portion by the tip input portion 10a such as the pen tip.
- the tip input part 10a such as a pen tip
- the light detection level at the light receiving element 6 [see FIG. 1 (a)] is reduced, and the pen tip is reduced due to the reduction in the light detection level. It is possible to detect the position (coordinates) of the tip input unit 10a and the movement trajectory thereof.
- the over clad layer 4 is a resin of the unexposed portion 2a of the photosensitive resin layer 2A for core formation. Since the mixed layer 4A in which the resin of the photosensitive resin layer 3A for forming the second cladding layer is mixed is cured, the refractive index of the over-cladding layer 4 is the photosensitive index for forming the second cladding layer.
- the refractive index of the core 2 is closer to the refractive index of the conventional cladding layer made of only the resin of the conductive resin layer 3A. That is, the refractive index difference between the core 2 and the over clad layer 4 is smaller than that of the prior art. Therefore, as described above, light is easily leaked (scattered) from the core 2 at the pressing portion by the tip input unit 10a (see FIG. 3) such as a pen tip, and the detection of the pressing position is made with higher sensitivity. can do.
- the position sensor When the position sensor is connected to a display or a personal computer (hereinafter referred to as “personal computer”) wirelessly or via a connection cable, when information such as characters is written to the input area of the position sensor with the input body 10 such as a pen,
- the position of the tip input unit 10a such as a pen tip and the movement locus thereof can be displayed on the display (including a display of a personal computer).
- the position sensor is provided with a storage means such as a memory, the information such as the characters can be stored as digital data in the storage means, and a playback terminal (such as a personal computer or a mobile device) is used later. Can be played (displayed). It can also be stored in the playback terminal.
- the optical waveguide W of the position sensor may be other than that of the above-described embodiment, for example, the optical waveguide W shown in FIGS. 1B and 1C may be upside down.
- the thickness of the clad layer located on the upper side of the core 2 is set to be as thin as, for example, in the range of 1 to 200 ⁇ m, like the over clad layer 4.
- 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 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 [FIG. 4C is two opposing directions, and FIG. 4D is two adjacent directions] are discontinuous.
- the three intersecting directions may be discontinuous, or as shown in FIG. 4 (f), all the four intersecting directions may be discontinuous. It may be discontinuous.
- a lattice shape having two or more kinds of intersections among the intersections shown in FIGS. 4 (a) to 4 (f) may be used. That is, in the present invention, the “lattice shape” formed by the plurality of linear cores 2 means that a part or all of the intersections are formed as described above.
- the light crossing loss can be reduced. That is, as shown in FIG. 5 (a), in an intersection where all four intersecting directions are continuous, if one of the intersecting directions [upward in FIG. 5 (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. 5A). On the other hand, as shown in FIG.
- Formation material of under cladding layer 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).
- a material for forming the under cladding layer was prepared.
- the under-cladding layer forming material had a refractive index of 1.496 at a wavelength of 830 nm. The refractive index was measured using a prism coupler (SAIRON TECHNOLOGY, SPA-4000) (the same applies hereinafter).
- Component d 10 parts by weight of epoxy resin (manufactured by Mitsubishi Chemical Corporation, JER1002).
- Component e 90 parts by weight of an epoxy resin (manufactured by Daicel, EHPE3150).
- 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.
- the refractive index of the core forming material at a wavelength of 830 nm was 1.516.
- Component h 100 parts by weight of an epoxy resin (Mitsubishi Chemical Corporation, YL7410).
- Component i 4 parts by weight of a photoacid generator (manufactured by Sun Apro, CPI101A).
- a material for forming the second cladding layer was prepared by mixing these components h and i.
- the material for forming the second cladding layer had a refractive index of 1.472 at a wavelength of 830 nm.
- optical waveguide An optical waveguide was fabricated in the same manner as in the above embodiment.
- the mixing volume ratio of the unexposed portion of the core forming material and the forming material of the second cladding layer is 25/18 in the region corresponding to the lattice portion of the core, The corresponding area was 10/21.
- the refractive index of the formed overcladding layer was 1.496 in the region corresponding to the lattice portion of the core and 1.486 in the region corresponding to the outer peripheral portion. From this, it can be seen that the refractive index difference between the core and the overcladding layer is larger in the region corresponding to the outer peripheral portion than in the region corresponding to the lattice portion.
- the refractive index difference between the core and the over clad layer (second clad layer) is the same in the region corresponding to the outer peripheral portion and the region corresponding to the lattice portion.
- the position sensor of the present invention can be used to save space and to prevent unnecessary leakage (scattering) of light and to detect an accurate pressing position.
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Abstract
Description
成分a:エポキシ樹脂(三菱化学社製、YL7410)60重量部。
成分b:エポキシ樹脂(ダイセル社製、EHPE3150)40重量部。
成分c:光酸発生剤(サンアプロ社製、CPI101A)4重量部。
これら成分a~cを混合することにより、アンダークラッド層の形成材料を調製した。このアンダークラッド層の形成材料の、波長830nmにおける屈折率は1.496であった。なお、屈折率の測定には、プリズムカプラー(SAIRON TECHNOLOGY 社製、SPA-4000)を用いた(以下同様)。
成分d:エポキシ樹脂(三菱化学社製、JER1002)10重量部。
成分e:エポキシ樹脂(ダイセル社製、EHPE3150)90重量部。
成分f:光酸発生剤(ADEKA社製、SP170)1重量部。
成分g:乳酸エチル(和光純薬工業社製、溶剤)50重量部。
これら成分d~gを混合することにより、コアの形成材料を調製した。このコアの形成材料の、波長830nmにおける屈折率は1.516であった。
成分h:エポキシ樹脂(三菱化学社製、YL7410)100重量部。
成分i:光酸発生剤(サンアプロ社製、CPI101A)4重量部。
これら成分h,iを混合することにより、第2クラッド層の形成材料を調製した。この第2クラッド層の形成材料の、波長830nmにおける屈折率は1.472であった。
上記実施の形態と同様にして、光導波路を作製した。オーバークラッド層を形成する際、コアの形成材料の未露光部分と、第2クラッド層の形成材料との混合体積比は、コアの格子状部分に対応する領域では、25/18、外周部分に対応する領域では、10/21であった。
上記実施例において、コア形成の際に、コア部分のみ露光し、ダミーコア部分は露光しなかった。そして、その露光後、現像により、未露光部分を溶解除去した。オーバークラッド層の形成は、上記第2クラッド層の形成材料を塗布した後、露光することより形成した。それ以外は、上記実施例と同様とした。すなわち、ダミーコアは形成せず、また、コアの形成材料の未露光部分と、第2クラッド層の形成材料との混合は行わなかった。
S 外周部分
D ダミーコア
2 コア
2A コア形成用の感光性樹脂層
2a 未露光部分
3A 第2クラッド層形成用の感光性樹脂層
4 オーバークラッド層
4A 混合層
Claims (2)
- 格子状部分と、この格子状部分から延設されてその格子状部分の外周に沿うよう曲げられた状態で配置された外周部分とにパターン形成された複数の線状のコアを、2層のシート状のクラッド層で挟持した状態で、シート状の光導波路を作製した後、上記外周部分のコアの端面に光素子を接続する位置センサの製法であって、上記光導波路の作製が、第1クラッド層を形成する工程と、この第1クラッド層の表面に、コア形成用の第1の感光性樹脂層を形成する工程と、このコア形成用の第1の感光性樹脂層に対して所定パターンの露光を施し、上記格子状部分に対応する領域では、上記露光により硬化させた部分を光路用のコアに形成し、上記外周部分に対応する領域では、上記露光により硬化させた部分を光路用のコアおよび非光路用のダミーコアに形成する工程と、上記露光後、上記コア形成用の第1の感光性樹脂層の露光部分からなるコアおよびダミーコアならびに未露光部分の表面を、第2クラッド層形成用の第2の感光性樹脂層で被覆する工程と、上記第1および第2の感光性樹脂層を加熱することにより、上記コア形成用の第1の感光性樹脂層の未露光部分の樹脂と第2クラッド層形成用の第2の感光性樹脂層の樹脂とを混合し混合層にする工程と、上記混合層を露光し、その露光により硬化させた混合層を第3クラッド層とする工程とを備えていることを特徴とする位置センサの製法。
- 上記請求項1記載の位置センサの製法によって得られた位置センサであって、コアの格子状部分の外周に沿うよう曲げられた状態で配置された外周部分に対応する領域に、非光路用のダミーコアが形成され、光路用のコアとそのコア周辺の第3クラッド層との屈折率差が、上記外周部分に対応する領域の方が、上記格子状部分に対応する領域よりも、大きくなっていることを特徴とする位置センサ。
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KR1020167005193A KR20160074453A (ko) | 2013-10-17 | 2014-07-22 | 위치 센서의 제법 및 그에 의해 얻어진 위치 센서 |
US15/024,562 US20160238416A1 (en) | 2013-10-17 | 2014-07-22 | Position sensor production method, and position sensor produced by the method |
CN201480051515.2A CN105556441A (zh) | 2013-10-17 | 2014-07-22 | 位置传感器的制造方法及由此得到的位置传感器 |
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JP2013216587 | 2013-10-17 | ||
JP2013-216587 | 2013-10-17 | ||
JP2014101372A JP2015099580A (ja) | 2013-10-17 | 2014-05-15 | 位置センサの製法およびそれによって得られた位置センサ |
JP2014-101372 | 2014-05-15 |
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Also Published As
Publication number | Publication date |
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KR20160074453A (ko) | 2016-06-28 |
US20160238416A1 (en) | 2016-08-18 |
TW201516810A (zh) | 2015-05-01 |
JP2015099580A (ja) | 2015-05-28 |
CN105556441A (zh) | 2016-05-04 |
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