WO2021065503A1 - 温度センサフィルム、導電フィルムおよびその製造方法 - Google Patents
温度センサフィルム、導電フィルムおよびその製造方法 Download PDFInfo
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- WO2021065503A1 WO2021065503A1 PCT/JP2020/035026 JP2020035026W WO2021065503A1 WO 2021065503 A1 WO2021065503 A1 WO 2021065503A1 JP 2020035026 W JP2020035026 W JP 2020035026W WO 2021065503 A1 WO2021065503 A1 WO 2021065503A1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K1/00—Details of thermometers not specially adapted for particular types of thermometer
- G01K1/02—Means for indicating or recording specially adapted for thermometers
- G01K1/026—Means for indicating or recording specially adapted for thermometers arrangements for monitoring a plurality of temperatures, e.g. by multiplexing
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B5/00—Non-insulated conductors or conductive bodies characterised by their form
- H01B5/14—Non-insulated conductors or conductive bodies characterised by their form comprising conductive layers or films on insulating-supports
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K7/00—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements
- G01K7/16—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using resistive elements
- G01K7/18—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using resistive elements the element being a linear resistance, e.g. platinum resistance thermometer
- G01K7/183—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using resistive elements the element being a linear resistance, e.g. platinum resistance thermometer characterised by the use of the resistive element
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K7/00—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements
- G01K7/16—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using resistive elements
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C14/00—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material
- C23C14/06—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material characterised by the coating material
- C23C14/10—Glass or silica
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C14/00—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material
- C23C14/06—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material characterised by the coating material
- C23C14/14—Metallic material, boron or silicon
- C23C14/20—Metallic material, boron or silicon on organic substrates
- C23C14/205—Metallic material, boron or silicon on organic substrates by cathodic sputtering
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K7/00—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements
- G01K7/16—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using resistive elements
- G01K7/18—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using resistive elements the element being a linear resistance, e.g. platinum resistance thermometer
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K7/00—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements
- G01K7/16—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using resistive elements
- G01K7/22—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using resistive elements the element being a non-linear resistance, e.g. thermistor
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B1/00—Conductors or conductive bodies characterised by the conductive materials; Selection of materials as conductors
- H01B1/02—Conductors or conductive bodies characterised by the conductive materials; Selection of materials as conductors mainly consisting of metals or alloys
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B13/00—Apparatus or processes specially adapted for manufacturing conductors or cables
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B13/00—Apparatus or processes specially adapted for manufacturing conductors or cables
- H01B13/0026—Apparatus for manufacturing conducting or semi-conducting layers, e.g. deposition of metal
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K7/00—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements
- G01K7/16—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using resistive elements
- G01K2007/163—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using resistive elements provided with specially adapted connectors
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K2217/00—Temperature measurement using electric or magnetic components already present in the system to be measured
Definitions
- the present invention relates to a temperature sensor film provided with a metal thin film patterned on a resin film base material, a conductive film used for producing the temperature sensor film, and a method for producing the same.
- thermocouple or a chip thermistor is generally used.
- thermocouple or chip thermistor is generally used.
- in order to measure the in-plane temperature distribution it is necessary to arrange a large number of sensors on the substrate, which causes an increase in cost.
- Patent Document 1 proposes a temperature sensor film in which a metal film is provided on a film base material and the metal film is patterned to form a resistance temperature detector and a lead portion.
- a metal film is provided on a film base material and the metal film is patterned to form a resistance temperature detector and a lead portion.
- a film base material since a film base material is used, it has an advantage that it has excellent flexibility and can easily cope with a large area.
- Patent Document 2 describes that nickel is about twice as sensitive to temperature (change in resistance) as copper.
- Metals such as nickel exhibit a characteristic (positive characteristic) that the resistance increases as the temperature rises, and bulk nickel has a resistance change rate (resistance temperature coefficient; TCR) of about 6000 ppm / ° C. with respect to temperature rise.
- TCR resistance temperature coefficient
- the temperature coefficient of resistance (TCR) was about half that of bulk nickel, and the film was used as a temperature sensor film. It turned out that sufficient temperature measurement accuracy for this was not obtained.
- an object of the present invention is to provide a conductive film provided with a metal thin film having a large resistance temperature coefficient on a resin film base material, and a temperature sensor film.
- the present inventors have found that there is a high correlation between the surface spacing of the (111) plane of the nickel thin film and the TCR, and have reached the present invention.
- the conductive film for a temperature sensor is provided with a nickel thin film on one main surface of a resin film base material.
- the surface spacing of the nickel (111) planes is preferably less than 0.2040 nm.
- a temperature sensor film can be manufactured by patterning the nickel thin film of this conductive film.
- the temperature sensor film includes a nickel thin film patterned on one main surface of a resin film base material, and the nickel thin film is patterned on a resistance temperature measuring resistance portion and a lead portion.
- Nickel thin films may be provided on both sides of the resin film base material.
- the resistance temperature detector is provided in the part where the temperature is measured and is patterned into thin lines.
- the lead portion is patterned with a line width larger than that of the resistance temperature detector, and one end of the lead portion is connected to the resistance temperature detector. The other end of the lead portion is connected to an external circuit or the like.
- a connector may be connected to the lead portion and connected to an external circuit via the connector.
- the temperature coefficient of resistance of the nickel thin film is preferably 4000 ppm / ° C. or higher.
- the thickness of the nickel thin film is preferably 100 to 500 nm.
- An underlayer may be provided between the resin film base material and the nickel thin film.
- an inorganic material such as a silicon-based thin film is preferable.
- FIG. 1 is a cross-sectional view showing a laminated configuration example of a conductive film used for forming a temperature sensor film, in which a nickel thin film 10 is provided on one main surface of a resin film base material 50.
- a nickel thin film 10 is provided on one main surface of a resin film base material 50.
- the conductive film includes a nickel thin film 10 on one main surface of the resin film base material 50. As shown in FIG. 1, the conductive film may include a base layer 20 between the resin film base material 50 and the nickel thin film 10.
- the resin film base material 50 may be transparent or opaque.
- the resin film base material 50 may be made of only a resin film, or may have a hard coat layer (cured resin layer) 6 on the surface of the resin film 5 as shown in FIG.
- the thickness of the resin film base material is not particularly limited, but is generally about 2 to 500 ⁇ m, preferably about 20 to 300 ⁇ m.
- An easy-adhesive layer, an antistatic layer, and the like are provided on the surface of the resin film base material 50 (when the hard coat layer 6 is provided, the surface of the resin film 5 and / or the surface of the hard coat layer 6). You may be.
- the surface of the resin film base material 50 may be subjected to treatments such as corona discharge treatment, ultraviolet irradiation treatment, plasma treatment, and sputtering etching treatment for the purpose of improving the adhesion to the base layer 20 and the like.
- the arithmetic average roughness Ra of the nickel thin film 10 forming surface of the resin film base material 50 is preferably 5 nm or less, more preferably 3 nm or less, still more preferably 2 nm or less.
- the arithmetic mean roughness Ra is obtained from an observation image of 1 ⁇ m square using a scanning probe microscope.
- the resin material of the resin film 5 examples include polyester such as polyethylene terephthalate, polyimide, polyolefin, cyclic polyolefin such as norbornene, polycarbonate, polyether sulfone, polyarylate and the like. Polyimide or polyester is preferable from the viewpoints of heat resistance, dimensional stability, electrical properties, mechanical properties, chemical resistance properties, and the like.
- the thickness of the resin film 5 is not particularly limited, but is generally about 2 to 500 ⁇ m, preferably about 20 to 300 ⁇ m.
- the hard coat layer 6 By providing the hard coat layer 6 on the surface of the resin film 5, the hardness of the conductive film is improved and the scratch resistance is enhanced.
- the hard coat layer 6 can be formed, for example, by applying a solution containing a curable resin onto the resin film 5.
- the curable resin examples include thermosetting resins, ultraviolet curable resins, and electron beam curable resins.
- the curable resin examples include various resins such as polyester-based, acrylic-based, urethane-based, acrylic-urethane-based, amide-based, silicone-based, silicate-based, epoxy-based, melamine-based, oxetane-based, and acrylic urethane-based.
- acrylic resins, acrylic urethane resins, and epoxy resins are preferable because they have high hardness, can be cured by ultraviolet rays, and have excellent productivity.
- an acrylic resin and an acrylic urethane resin are preferable because they have high adhesion to the chromium oxide thin film contained in the base layer.
- the UV curable resin includes UV curable monomers, oligomers, polymers and the like. Examples of the ultraviolet curable resin preferably used include those having an ultraviolet polymerizable functional group, and among them, those containing an acrylic monomer or oligomer having 2 or more, particularly 3 to 6 of the functional groups as a component.
- the hard coat layer 6 may contain fine particles.
- the fine particles include various metal oxide fine particles such as silica, alumina, titania, zirconia, calcium oxide, tin oxide, indium oxide, cadmium oxide, and antimony oxide, glass fine particles, polymethylmethacrylate, polystyrene, polyurethane, and acrylic-styrene common weight.
- Crosslinked or uncrosslinked organic fine particles, silicone-based fine particles, etc. made of a polymer such as coalesced, benzoguanamine, melamine, or polycarbonate can be used without particular limitation.
- the average particle size (average primary particle size) of the fine particles is preferably about 10 nm to 10 ⁇ m.
- the surface of the hard coat layer 6 (resin film base material 50) is formed by the hard coat layer containing fine particles having a submicron or ⁇ m order average particle size of about 0.5 ⁇ m to 10 ⁇ m, preferably about 0.8 ⁇ m to 5 ⁇ m.
- protrusions having a diameter on the order of submicron or ⁇ m are formed, and the slipperiness, blocking resistance, and scratch resistance of the conductive film tend to be improved.
- the hard coat layer contains fine particles having an average particle size of about 10 nm to 100 nm, preferably about 20 nm to 80 nm, fine irregularities are formed on the surface of the hard coat layer 6 (the surface of the resin film base material 50). , The adhesion between the hard coat layer 6 and the base layer 20 and the nickel thin film 10 tends to be improved.
- the solution for forming the hard coat layer contains an ultraviolet polymerization initiator.
- the solution may contain additives such as a leveling agent, a thixotropy agent, and an antistatic agent.
- the thickness of the hard coat layer 6 is not particularly limited, but in order to achieve high hardness, 0.5 ⁇ m or more is preferable, 0.8 ⁇ m or more is more preferable, and 1 ⁇ m or more is further preferable. Considering the ease of formation by coating, the thickness of the hard coat layer is preferably 15 ⁇ m or less, more preferably 10 ⁇ m or less.
- a base layer 20 may be provided between the resin film base material 50 and the nickel thin film 10.
- the base layer 20 may be a single layer, or may be a laminated structure of two or more thin films 21 and 22 as shown in FIG.
- the base layer 20 By providing the base layer 20 on the resin film base material 50 and forming the nickel thin film 10 on the base layer 20, plasma damage to the resin film base material 50 at the time of forming the nickel thin film 10 can be suppressed.
- the base layer 20 it is possible to block water, organic gas and the like generated from the resin film base material 50 and suppress the mixing of impurities into the nickel thin film 10.
- the base layer 20 is preferably an inorganic material.
- the base layer 20 may be conductive or insulating.
- the base layer 20 may be patterned together with the nickel thin film 10 when the temperature sensor film is produced.
- the base layer 20 is an insulating inorganic material (inorganic dielectric)
- the base layer 20 may or may not be patterned.
- Inorganic materials include Si, Ge, Sn, Pb, Al, Ga, In, Tl, As, Sb, Bi, Se, Te, Mg, Ca, Sr, Ba, Sc, Y, Ti, Zr, Hf, V. , Nb, Ta, Cr, Mo, W, Mn, Tc, Re, Fe, Ru, Os, Co, Rh, Ir, Pd, Pt, Cu, Ag, Au, Zn, Cd and other metallic or metalloid elements. , And these alloys, nitrides, oxides, nitrogen oxides and the like.
- a material for the base layer As, a silicon-based material, a chrome-based material, or the like is preferable. Silicon oxide is particularly preferable as the silicon-based material, and chromium oxide is particularly preferable as the chromium-based material.
- Silicon oxide may have a stoichiometric composition (SiO 2 ) or a non-stoichiometric composition (SiO x ; x ⁇ 2).
- the silicon oxide (SiO x ) having a non-stoichiometric composition preferably has 1.2 ⁇ x ⁇ 2.
- the silicon oxide thin film 22 may be formed on the silicon thin film 21. Further, the silicon oxide thin film 22 may be formed on the inorganic thin film 21 made of various metals, conductive oxides, ceramics and the like.
- the surface spacing of the nickel (111) planes tends to be small, and the TCR tends to be large.
- the base layer 20 contains a silicon-based thin film
- the TCR of the nickel thin film tends to be large, and this tendency is remarkable when the silicon oxide thin film is provided directly under the nickel thin film 10.
- the base layer 20 has a laminated structure of a chromium-based thin film 21 and a silicon oxide thin film 22
- the TCR of the nickel thin film tends to be large, and in particular, the thin film 21 in contact with the resin film base material is the chromium oxide thin film. In some cases, the tendency is remarkable.
- a chromium-based thin film such as chromium oxide tends to form a dense and highly smooth film, and the surface smoothness of the inorganic thin film 22 formed on the film is easily improved, which is one of the reasons for the improvement in TCR of the nickel thin film 10. Is considered to be.
- the thickness of the base layer is not particularly limited. From the viewpoint of reducing plasma damage to the resin film base material and enhancing the effect of blocking outgas from the resin film base material, the thickness of the base layer is preferably 1 nm or more, more preferably 3 nm or more, still more preferably 5 nm or more. From the viewpoint of improving productivity and reducing material cost, the thickness of the base layer is preferably 200 nm or less, more preferably 100 nm or less, still more preferably 50 nm or less. When the base layer 20 is composed of a plurality of layers, the total thickness is preferably in the above range.
- the method of forming the base layer 20 is not particularly limited, and either dry coating or wet coating can be adopted.
- the nickel thin film is formed by the sputtering method
- it is preferable that the base layer 20 is also formed by the sputtering method from the viewpoint of productivity. Further, it is preferable to form the base layer 20 by a sputtering method because a dense film is easily formed and the effect of suppressing the mixing of water and organic substances from the resin film base material 50 to the nickel thin film 10 is excellent.
- the target When forming the base layer by the sputtering method, the target may be selected according to the material of the base layer. For example, when forming a silicon thin film, a silicon target is used. A silicon oxide target may be used for forming the silicon oxide thin film, or silicon oxide may be formed by reactive sputtering using the silicon target. In the reactive sputtering, it is preferable to adjust the amount of oxygen so as to be an intermediate transition region between the metal region and the oxide region.
- the nickel thin film 10 provided on the resin film base material 50 plays a central role in temperature measurement in the temperature sensor. By patterning the nickel thin film 10, the lead portion 11 and the resistance temperature measuring resistance portion 12 are formed as shown in FIG.
- the nickel thin film 10 is preferably a thin film composed of nickel and unavoidable impurities, and the proportion of nickel is preferably 99% by weight or more, preferably 99.9% by weight or more.
- sputter film formation using a nickel target forms a thin film composed of nickel and unavoidable impurities.
- the thickness of the nickel thin film 10 is not particularly limited, but from the viewpoint of reducing the resistance (particularly, from the viewpoint of reducing the resistance of the lead portion), 20 nm or more is preferable, 40 nm or more is more preferable, and 50 nm or more is further preferable. On the other hand, from the viewpoint of shortening the film formation time and improving the patterning accuracy, the thickness of the nickel thin film 10 is preferably 500 nm or less, more preferably 300 nm or less, still more preferably 250 nm or less.
- the temperature coefficient of resistance (TCR) of the nickel thin film 10 is preferably 3000 ppm / ° C. or higher, more preferably 3500 ppm / ° C. or higher, and even more preferably 4000 ppm / ° C. or higher.
- TCR is the rate of change of resistance with respect to temperature rise.
- Nickel has a property (positive property) in which the resistance linearly increases as the temperature rises.
- TCR material having positive characteristics, and the resistance value R 0 in the temperature T 0, the resistance value R 1 at a temperature T 1, is calculated by the following equation.
- TCR ⁇ (R 1- R 0 ) / R 0 ⁇ / (T 1- T 0 )
- the larger the TCR the larger the change in resistance to temperature changes, and the higher the temperature measurement accuracy in the temperature sensor film. Therefore, the larger the TCR of the nickel thin film, the more preferable, but it is difficult to make the TCR larger than that of bulk nickel, and the TCR of the nickel thin film is generally 6000 ppm / ° C. or less.
- the nickel thin film 10 preferably has a surface spacing of nickel (111) planes determined by X-ray diffraction of less than 0.2040 nm.
- the incident optical system (X-ray source) and the light receiving optical system (detector 9) are arranged so as to be symmetrical with respect to the normal direction of the film surface of the nickel thin film.
- a 2 ⁇ / ⁇ scan is performed with an optical system, and the lattice spacing of the crystal 1c whose normal of the lattice plane is parallel to the thin film plane is measured.
- the anisotropy of the transport tension in the roll-to-roll process and the dimensional change rate and Young's modulus of the film substrate can be factors that cause anisotropy in the surface spacing.
- the interplanar spacing d 1 measured by applying X-rays from an arbitrary first direction, measured incident X-rays from a second direction perpendicular to the first direction
- the average value (d 1 + d 2 ) / 2 with the surface spacing d 2 is defined as the surface spacing of the crystals of the nickel thin film.
- the interplanar spacing of the (111) planes of nickel may be 0.2039 nm or less, 0.2038 nm or less, or 0.2037 nm or less.
- the interplanar spacing of the (111) planes of nickel is generally 0.2030 nm or more.
- the nickel single crystal is a cubic crystal having a lattice constant of 0.3524 nm, and the (111) plane spacing is 0.2035 nm.
- the nickel thin film formed on the resin film base material tends to have a larger lattice constant than a single crystal and a larger plane spacing of the (111) plane. In particular, when the interplanar spacing is 0.2040 nm or more, it can be said that the crystal strain is large.
- the resistance value of a substance is affected by the electron density and electron mobility in the substance, and the smaller the electron density and the smaller the electron mobility, the higher the resistance. Since metals such as nickel are rich in free electrons, electron mobility is a factor that controls resistance. Scattering mechanisms include scattering due to collision with atomic nuclei (lattice vibration scattering), scattering due to impurities and lattice defects (impurity scattering), magnetic scattering, etc. Among these, lattice vibration scattering and magnetic scattering are temperature-dependent. Is large, and it is known that impurity scattering has a small temperature dependence.
- the interplanar spacing of the (111) planes is less than 0.2040 nm and the interplanar spacing of the (111) planes of the Ni single crystal is close to 0.2035 nm, which means that the crystal disorder (lattice defect) is small. That is, when the surface spacing of the (111) planes of the nickel thin film is small, the influence of impurity scattering is small, and the influence of lattice vibration scattering and magnetic scattering is relatively large, so that the temperature dependence (TCR) of the resistor is large. Is expected to increase.
- the base layer 20 acts as a buffer layer for alleviating the mismatch of nickel lattice spacing, and has an action of promoting nickel crystallization and reducing lattice defects, thereby reducing the lattice spacing. It is thought that it contributes to this.
- the thickness of the nickel thin film is preferably 80 nm or more, more preferably 100 nm or more, still more preferably 120 nm or more.
- the method for forming the nickel thin film is not particularly limited, and for example, a deposition method such as a sputtering method, a vacuum vapor deposition method, an electron beam vapor deposition method, a chemical vapor deposition method (CVD), a chemical solution deposition method (CBD), or a plating method can be used. Can be adopted. Among these, the sputtering method is preferable because a thin film having excellent film thickness uniformity can be formed. The productivity of the conductive film is enhanced by forming a film while continuously moving a long resin film base material in the longitudinal direction using a roll-to-roll sputtering apparatus.
- the inside of the sputtering apparatus is exhausted before the start of sputtering film formation to create an atmosphere in which water and organic gas impurities generated from the resin film base material are removed. Is preferable.
- the degree of vacuum (reached vacuum degree) in the sputtering apparatus before the start of sputtering film formation is, for example, 1 ⁇ 10 ⁇ 2 Pa or less, preferably 5 ⁇ 10 -3 Pa or less, and more preferably 1 ⁇ 10 -3 Pa or less.
- 5 ⁇ 10 -4 Pa or less is more preferable
- 5 ⁇ 10 -5 Pa or less is particularly preferable.
- a metallic Ni target is used for sputter film formation of a nickel thin film, and film formation is performed while introducing an inert gas such as argon.
- the film forming conditions of the nickel thin film are not particularly limited, but it is preferable to select the film forming conditions so as to reduce the mixing of impurities caused by water and organic gas from the resin film base material.
- the resin film base material is treated under vacuum before sputter film formation to remove water and organic gas in the resin film base material.
- (3) Provide a base layer such as a silicon oxide thin film on the resin film base material to provide moisture and organic gas from the resin film base material. , Etc. can be mentioned.
- Examples of methods for reducing damage to the resin film substrate during sputter film formation include lowering the substrate temperature during film formation and lowering the discharge power density.
- the substrate temperature is preferably 80 ° C. or lower, more preferably 60 ° C. or lower, from the viewpoint of suppressing the generation of water and organic gas from the resin film base material. , 50 ° C. or lower is more preferable.
- the base layer When a base layer is provided on the resin film base material and a nickel thin film is formed on the base layer, the base layer has a function of blocking water and organic gas from the resin film base material even when the substrate temperature is high. Therefore, the substrate temperature at the time of forming the nickel thin film can be appropriately set within a range in which the resin film substrate has heat resistance. Further, the higher the substrate temperature, the smaller the surface spacing of the nickel (111) planes tends to be. Therefore, when a base layer is provided on the resin film base material and a nickel thin film is formed on the base layer, the substrate temperature is preferably 30 ° C. or higher, more preferably 50 ° C. or higher, and even more preferably 70 ° C. or higher. The substrate temperature may be 100 ° C. or higher, 120 ° C. or higher, or 130 ° C. or higher.
- the discharge power density is preferably 0.1 ⁇ 5.0W / cm 2, 1.0 ⁇ 3.5W / cm 2 Gayori preferable.
- heat treatment may be carried out.
- the crystallinity of nickel is enhanced, the surface spacing of the (111) plane is reduced, and the TCR tends to be improved. It is considered that as the crystallization of nickel progresses by heating, the reduction of lattice defects due to the rearrangement of atoms contributes to the reduction of the lattice spacing.
- the heating temperature is preferably 80 ° C. or higher, more preferably 100 ° C. or higher, and even more preferably 120 ° C. or higher.
- the upper limit of the heating temperature may be determined in consideration of the heat resistance of the resin film base material, and is generally 200 ° C. or lower or 180 ° C. or lower.
- the heating temperature may exceed the above range.
- the heating time is preferably 1 minute or longer, more preferably 5 minutes or longer, and even more preferably 10 minutes or longer.
- the timing of the heat treatment is not particularly limited as long as the nickel thin film is formed. For example, the nickel thin film may be patterned and then heat-treated.
- a temperature sensor film is formed by patterning the nickel thin film 10 of the conductive film. As shown in FIG. 3, in the temperature sensor film, the nickel thin film has a lead portion 11 formed in a wiring shape and a resistance temperature measuring resistance portion 12 connected to one end of the lead portion 11. The other end of the lead portion 11 is connected to the connector 19.
- the resistance temperature detector 12 is a region that acts as a temperature sensor, and the temperature is measured by applying a voltage to the resistance temperature detector 12 via the lead portion 11 and calculating the temperature from the resistance value.
- the resistance temperature detector 12 is a region that acts as a temperature sensor, and the temperature is measured by applying a voltage to the resistance temperature detector 12 via the lead portion 11 and calculating the temperature from the resistance value.
- FIG. 4A is an enlarged view of the vicinity of the resistance temperature detector in the 2-wire temperature sensor.
- the resistance temperature detector 12 is formed by sensor wirings 122 and 123 in which a nickel thin film is patterned in a fine line shape.
- the sensor wiring has a zigzag pattern in which a plurality of vertical electrodes 122 are connected at their ends via horizontal wiring 123 to form a hairpin-shaped bent portion.
- the area of the resistance temperature detector 12 can be small and the length of the sensor wiring (the line length from one end 121a to the other end 121b) can be increased.
- the pattern shape of the sensor wiring of the temperature measuring unit is not limited to the shape shown in FIG. 4, and may be a spiral pattern shape or the like.
- the line width of the sensor wiring 122 (vertical wiring) and the distance (space width) between adjacent wirings may be set according to the patterning accuracy of photolithography.
- the line width and space width are generally about 1 to 150 ⁇ m.
- the line width is preferably 3 ⁇ m or more, and preferably 5 ⁇ m or more.
- the line width is preferably 100 ⁇ m or less, more preferably 70 ⁇ m or less.
- the space width is preferably 3 to 100 ⁇ m, more preferably 5 to 70 ⁇ m.
- Both ends 121a and 121b of the sensor wiring of the resistance temperature detector 12 are connected to one ends of the lead portions 11a and 11b, respectively.
- the two lead portions 11a and 11b are formed in an elongated pattern with a slight gap between them, and the other end of the lead portion is connected to the connector 19.
- the lead portion is formed wider than the sensor wiring of the resistance temperature detector 12 in order to secure a sufficient current capacity.
- the widths of the lead portions 11a and 11b are, for example, about 0.5 to 10 mm.
- the line width of the lead portion is preferably 3 times or more, more preferably 5 times or more, still more preferably 10 times or more the line width of the sensor wiring 122 of the temperature measuring resistance unit 12.
- the connector 19 is provided with a plurality of terminals, and the plurality of lead portions are connected to different terminals.
- the connector 19 is connected to an external circuit, and by applying a voltage between the lead portion 11a and the lead portion 11b, a current flows through the lead portion 11a, the resistance temperature measuring resistor portion 12, and the lead portion 11b.
- the resistance value is calculated from the current value when a predetermined voltage is applied or the applied voltage when the voltage is applied so that the current becomes a predetermined value.
- the temperature is calculated from the resistance value based on the relational expression between the obtained resistance value and the temperature obtained in advance, or a table or the like in which the relationship between the resistance value and the temperature is recorded.
- the resistance value obtained here includes the resistance of the lead portion 11a and the lead portion 11b in addition to the resistance of the resistance temperature measuring resistor portion 12, but the resistance of the resistance temperature measuring resistor portion 12 is the resistance of the lead portions 11a and 11b. Since it is sufficiently larger than that of the resistance temperature detector 12, the obtained measured value may be regarded as the resistance of the resistance temperature detector 12. From the viewpoint of reducing the influence of the resistance of the lead portion, the lead portion may be a 4-wire type.
- FIG. 4B is an enlarged view of the vicinity of the resistance temperature detector in the 4-wire temperature sensor.
- the pattern shape of the resistance temperature detector 12 is the same as in FIG. 4A.
- four lead portions 11a1, 11a2, 11b1, 11b2 are connected to one resistance temperature detector 12.
- the lead portions 11a1 and 11b1 are voltage measurement leads, and the lead portions 11a2 and 11b2 are current measurement leads.
- the voltage measurement lead 11a1 and the current measurement lead 11a2 are connected to one end 121a of the sensor wiring of the temperature measurement resistance unit 12, and the voltage measurement lead 11b1 and the current measurement lead 11b2 are the sensors of the temperature measurement resistance unit 12. It is connected to the other end 121b of the wiring.
- the resistance value of only the resistance temperature detector 12 can be measured by excluding the resistance of the lead portion, so that the measurement with less error is possible.
- a 3-wire system may be adopted.
- the patterning method of the nickel thin film is not particularly limited. Since patterning is easy and the accuracy is high, it is preferable to perform patterning by a photolithography method. In photolithography, an etching resist corresponding to the shapes of the lead portion and the temperature measuring resistance portion is formed on the surface of the nickel thin film, and the nickel thin film in the region where the etching resist is not formed is removed by wet etching and then etched. Peel off the resist.
- the patterning of the nickel thin film can also be performed by dry etching such as laser processing.
- a nickel thin film 10 is formed on the resin film base material 50 by a sputtering method or the like, and by patterning the nickel thin film, a plurality of lead portions and resistance temperature measuring resistance portions can be formed on the substrate surface. ..
- a temperature sensor element can be obtained by connecting the connector 19 to the end of the lead portion 11 of the temperature sensor film.
- the lead portions are connected to the plurality of resistance temperature detectors, and the plurality of lead portions may be connected to one connector 19. Therefore, it is possible to easily form a temperature sensor element capable of measuring the temperature at a plurality of locations in the plane.
- the nickel thin film is provided on one main surface of the resin film base material, but nickel thin films may be provided on both sides of the resin film base material. Further, a nickel thin film may be provided on one main surface of the resin film base material, and a thin film made of another material may be provided on the other main surface.
- connection method between the lead portion of the temperature sensor film and the external circuit is not limited to the form via the connector.
- a controller for applying a voltage to the lead portion to measure the resistance may be provided on the temperature sensor film.
- the lead portion and the lead wiring from the external circuit may be connected by soldering or the like without using a connector.
- the temperature sensor film has a simple structure in which a thin film is provided on a resin film base material, has excellent productivity, is easy to process, and can be applied to curved surfaces. Further, since the interplanar spacing of Ni crystals in the nickel thin film is small and the TCR is large, more accurate temperature measurement can be realized.
- Example 1 A roll of a polyethylene terephthalate (PET) film (Toray's "Lumirror 149UNS", surface arithmetic average roughness Ra: 1.6 nm) with a thickness of 150 ⁇ m is set in a roll-to-roll sputtering device, and the degree of vacuum reached inside the sputtering device. After exhausting until the thickness becomes 5.0 ⁇ 10 -3 Pa, a silicon thin film having a thickness of 5 nm, a silicon oxide thin film having a thickness of 10 nm, and a nickel thin film having a thickness of 270 nm are sequentially placed on a PET film at a substrate temperature of 150 ° C.
- PET polyethylene terephthalate
- a film was formed by DC sputtering.
- a B-doped Si target was used to form the Si layer and the SiO 2 layer.
- Argon was introduced as a sputtering gas into the Si layer, and a film was formed under the conditions of a pressure of 0.3 Pa and a power density of 1.0 W / cm 2.
- the film was formed under the conditions.
- a metallic nickel target was used to form the nickel thin film, and the film was formed under the conditions of a pressure of 0.25 Pa and a power density of 5.6 W / cm 2.
- Example 2 The conductive film of Example 1 was heated in a hot air oven at 155 ° C. for 60 minutes to prepare a conductive film.
- Example 1 A conductive film having a 230 nm-thick nickel thin film formed on a PET film under the same conditions as in Example 1 without forming a silicon thin film and a silicon oxide thin film, and contacting the PET film with the nickel thin film. was produced.
- Comparative Example 2 A conductive film was produced in the same manner as in Comparative Example 1 except that the thickness of the nickel thin film was changed to 180 nm.
- Example 3 A conductive film was produced in the same manner as in Example 1 except that the thickness of the nickel thin film was changed to 160 nm.
- Example 3 The conductive film of Comparative Example 3 was heated in a hot air oven at 155 ° C. for 60 minutes to prepare a conductive film.
- Example 4 A conductive film provided with a nickel thin film on a PET film via a chromium thin film as an underlayer and a silicon oxide thin film in the same manner as in Example 3 except that a metallic chromium thin film having a thickness of 5 nm was formed in place of the silicon thin film.
- a metallic chromium target was used to form the chromium thin film, argon was introduced as a sputtering gas, and the film was formed under the conditions of a pressure of 0.25 Pa and a power density of 0.74 W / cm 2.
- Example 5 The conductive film of Example 4 was heated in a hot air oven at 155 ° C. for 60 minutes to prepare a conductive film.
- Example 4 Conductive with a nickel thin film via a chromium oxide thin film as an underlayer and a silicon oxide thin film on a PET film in the same manner as in Example 3 except that a chromium oxide thin film having a thickness of 5 nm was formed in place of the silicon thin film.
- a film was made.
- a film was formed under the condition of cm 2.
- Example 6 The conductive film of Comparative Example 4 was heated in a hot air oven at 155 ° C. for 60 minutes to prepare a conductive film.
- AZO aluminum-doped zinc oxide
- X-ray source CuK ⁇ ray (wavelength: 0.1548nm), 45KV, 200mA
- Optical system Parallel beam optical system
- Incident slit 1.0 mm
- Incident PSA 0.5 ° Length limiting slit: 10 mm
- Received PSA 0.114 °
- Light receiving slit 1 20 mm
- Light receiving slit 2 20.1 mm
- Scan axis 2 ⁇ / ⁇ Step width: 0.04 ° Scan range: 40 ° to 46 °
- TCR Temporal coefficient of resistance
- the conductive film was cut into a size of 10 mm ⁇ 200 mm, and the nickel layer was patterned into a stripe shape having a line width of 30 ⁇ m by laser patterning to form a resistance temperature detector having the shape shown in FIG. 4A.
- the length of the pattern was adjusted so that the overall wiring resistance was about 10 k ⁇ and the resistance of the resistance temperature detector was 30 times the resistance of the lead, and a temperature sensor film was produced.
- the resistance temperature detectors of the temperature sensor film were set to 5 ° C, 25 ° C, and 45 ° C.
- the two-terminal resistance at each temperature was measured by connecting one tip and the other tip of the reed portion to a tester, passing a constant current, and reading the voltage.
- the average value of the TCR calculated from the resistance values of 5 ° C. and 25 ° C. and the TCR calculated from the resistance values of 25 ° C. and 45 ° C. was taken as the TCR of the nickel layer.
- Table 1 shows the laminated structure of the conductive films of Examples and Comparative Examples, the heat treatment conditions after the film formation, and the characteristics of the conductive film (plane spacing and TCR of Ni (111) planes).
- the lattice spacing of nickel crystals becomes smaller due to the formation of an underlayer on the resin film substrate, the increase in the thickness of the nickel thin film, the heat treatment after the formation of the nickel thin film, etc., resulting in a high TCR.
- a conductive film having excellent applicability to a temperature sensor film can be obtained.
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Abstract
Description
導電フィルムは、樹脂フィルム基材50の一主面上にニッケル薄膜10を備える。図1に示すように、導電フィルムは、樹脂フィルム基材50とニッケル薄膜10との間に下地層20を備えていてもよい。
樹脂フィルム基材50は、透明でも不透明でもよい。樹脂フィルム基材50は、樹脂フィルムのみからなるものでもよく、図1に示すように、樹脂フィルム5の表面にハードコート層(硬化樹脂層)6を備えるものでもよい。樹脂フィルム基材の厚みは特に限定されないが、一般には、2~500μm程度であり、20~300μm程度が好ましい。
樹脂フィルム5の樹脂材料としては、ポリエチレンテレフタレート等のポリエステル、ポリイミド、ポリオレフィン、ノルボルネン系等の環状ポリオレフィン、ポリカーボネート、ポリエーテルスルフォン、ポリアリレート等が挙げられる。耐熱性、寸法安定性、電気的特性、機械的特性、耐薬品特性等の観点から、ポリイミドまたはポリエステルが好ましい。樹脂フィルム5の厚みは特に限定されないが、一般には、2~500μm程度であり、20~300μm程度が好ましい。
樹脂フィルム5の表面にハードコート層6が設けられることにより、導電フィルムの硬度が向上し、耐擦傷性が高められる。ハードコート層6は、例えば、樹脂フィルム5上に、硬化性樹脂を含有する溶液を塗布することにより形成できる。
図1に示すように、樹脂フィルム基材50とニッケル薄膜10の間には下地層20が設けられていてもよい。下地層20は単層でもよく、図1に示すように2層以上の薄膜21,22の積層構成でもよい。樹脂フィルム基材50上に下地層20を設け、その上にニッケル薄膜10を形成することにより、ニッケル薄膜10成膜時の樹脂フィルム基材50へのプラズマダメージを抑制できる。また、下地層20を設けることにより、樹脂フィルム基材50から発生する水分や有機ガス等を遮断して、ニッケル薄膜10への不純物の混入を抑制できる。ニッケル薄膜への有機物の混入を抑制する観点から、下地層20は無機材料であることが好ましい。
樹脂フィルム基材50上に設けられるニッケル薄膜10は、温度センサにおける温度測定の中心的な役割を果たす。ニッケル薄膜10をパターニングすることにより、図3に示すように、リード部11および測温抵抗部12が形成される。
TCR={(R1-R0)/R0}/(T1-T0)
ニッケル薄膜の形成方法は特に限定されず、例えば、スパッタ法、真空蒸着法、電子ビーム蒸着法、化学気相蒸着法(CVD)、化学溶液析出法(CBD)、めっき法等の成膜方法を採用できる。これらの中でも、膜厚均一性に優れた薄膜を成膜できることから、スパッタ法が好ましい。ロールトゥロールスパッタ装置を用い、長尺の樹脂フィルム基材を長手方向に連続的に移動させながら成膜を行うことにより、導電フィルムの生産性が高められる。
ニッケル薄膜を成膜後に、加熱処理を実施してもよい。樹脂フィルム基材上にニッケル薄膜を備える導電フィルムを加熱することにより、ニッケルの結晶性が高められるとともに、(111)面の面間隔が小さくなり、TCRが向上する傾向がある。加熱によるニッケルの結晶化が進むと、原子の再配列により格子欠陥が減少すること等が、格子間隔を小さくすることに寄与していると考えられる。
導電フィルムのニッケル薄膜10をパターニングすることにより、温度センサフィルムが形成される。図3に示すように、温度センサフィルムにおいて、ニッケル薄膜は、配線状に形成されたリード部11と、リード部11の一端に接続された測温抵抗部12を有する。リード部11の他端は、コネクタ19に接続されている。
ロールトゥロールスパッタ装置内に、厚み150μmのポリエチレンテレフタレート(PET)フィルム(東レ製「ルミラー 149UNS」、表面の算術平均粗さRa:1.6nm)のロールをセットし、スパッタ装置内を到達真空度が5.0×10-3Paとなるまで排気した後、基板温度150℃にて、PETフィルム上に、厚み5nmのシリコン薄膜、厚み10nmの酸化シリコン薄膜、および厚み270nmのニッケル薄膜を、順に、DCスパッタにより成膜した。Si層およびSiO2層の形成には、BドープSiターゲットを用いた。Si層は、スパッタガスとしてアルゴンを導入し、圧力0.3Pa、パワー密度1.0W/cm2の条件で成膜した。SiO2層は、スパッタガスとしてのアルゴンに加えて反応性ガスとして酸素を導入し(O2/Ar=0.12/1.0)、圧力0.3Pa、パワー密度1.8W/cm2の条件で成膜した。ニッケル薄膜の形成には金属ニッケルターゲットを用い、圧力0.25Pa、パワー密度5.6W/cm2の条件で成膜した。
実施例1の導電フィルムを、155℃の熱風オーブン中で60分加熱して、導電フィルムを作製した。
シリコン薄膜の成膜および酸化シリコン薄膜の成膜を行わず、実施例1と同一の条件で、PETフィルム上に厚み230nmのニッケル薄膜を形成し、PETフィルム上に接してニッケル薄膜を備える導電フィルムを作製した。
ニッケル薄膜の厚みを180nmに変更したこと以外は比較例1と同様にして、導電フィルムを作製した。
ニッケル薄膜の厚みを160nmに変更したこと以外は実施例1と同様にして、導電フィルムを作製した。
比較例3の導電フィルムを、155℃の熱風オーブン中で60分加熱して、導電フィルムを作製した。
シリコン薄膜に代えて厚み5nmの金属クロム薄膜を形成したこと以外は、実施例3と同様にして、PETフィルム上に、下地層としてのクロム薄膜および酸化シリコン薄膜を介してニッケル薄膜を備える導電フィルムを作製した。クロム薄膜の形成には金属クロムターゲットを用い、スパッタガスとしてアルゴンを導入し、圧力0.25Pa、パワー密度0.74W/cm2の条件で成膜した。
実施例4の導電フィルムを、155℃の熱風オーブン中で60分加熱して、導電フィルムを作製した。
シリコン薄膜に代えて厚み5nmの酸化クロム薄膜を形成したこと以外は、実施例3と同様にして、PETフィルム上に、下地層としての酸化クロム薄膜および酸化シリコン薄膜を介してニッケル薄膜を備える導電フィルムを作製した。酸化クロム薄膜の形成には金属クロムターゲットを用い、スパッタガスとしてアルゴンに加えて酸素を導入し(O2/Ar=0.12/1.0)、圧力0.19Pa、パワー密度1.82W/cm2の条件で成膜した。
比較例4の導電フィルムを、155℃の熱風オーブン中で60分加熱して、導電フィルムを作製した。
シリコン薄膜に代えて厚み5nmのアルミニウムドープ酸化亜鉛(AZO)薄膜を形成したこと以外は、実施例3と同様にして、PETフィルム上に、下地層としてのAZO薄膜および酸化シリコン薄膜を成膜し、その上にニッケル薄膜を成膜した。AZO薄膜の形成には酸化アルミニウムドープ酸化亜鉛の焼結ターゲットを用い、スパッタガスとしてアルゴンに加えて酸素を導入し(O2/Ar=0.12/1.0)、圧力0.19Pa、パワー密度1.82W/cm2の条件で成膜した。得られた導電フィルムを、155℃の熱風オーブン中で60分加熱した。
<X線回折>
粉末X線回折装置(リガク製「SmartLab」)を用い、下記の条件で、図2に示す光学系により、膜面の法線方向をθ=0°として2θ/θスキャンを実施して、格子面の法線がニッケル薄膜の膜面に向いた(111)面の面間隔を測定した。X線の照射方向(X線の入射光学系と受光光学系を含む平面)が、MD方向(スパッタ成膜時の搬送方向)と平行となるようにしてMD方向の測定を行い、さらに、試料ステージを90°回転してTD方向(MD方向と直交する方向)の測定を行った。MD方向およびTD方向のそれぞれについて、得られたX線回折パターンの2θ=44.5°付近の回折ピーク(Ni(fcc)の(111)面回折ピーク)のピーク角度から、(111)面の面間隔を算出した。
X線源:CuKα線(波長:0.15418nm)、45KV、200mA
光学系:平行ビーム光学系
入射スリット:1.0mm
入射PSA:0.5°
長手制限スリット:10mm
受光PSA:0.114°
受光スリット1:20mm
受光スリット2:20.1mm
スキャン軸:2θ/θ
ステップ幅:0.04°
スキャン範囲:40°~46°
(温度センサフィルムの作製)
導電フィルムを、10mm×200mmのサイズにカットし、レーザーパターニングにより、ニッケル層を線幅30μmのストライプ形状にパターン加工して、図4Aに示す形状の測温抵抗部を形成した。パターニングに際しては、全体の配線抵抗が約10kΩ、測温抵抗部の抵抗がリード部の抵抗の30倍となるように、パターンの長さを調整し、温度センサフィルムを作製した。
小型の加熱冷却オーブンで、温度センサフィルムの測温抵抗部を5℃、25℃、45℃とした。リード部の一方の先端と他方の先端をテスタに接続し、定電流を流し電圧を読み取ることにより、それぞれの温度における2端子抵抗を測定した。5℃および25℃の抵抗値から計算したTCRと、25℃および45℃の抵抗値から計算したTCRの平均値を、ニッケル層のTCRとした。
実施例および比較例の導電フィルムの積層構成および成膜後の加熱処理条件、ならびに導電フィルムの特性(Ni(111)面の面間隔およびTCR)を表1に示す。
5 樹脂フィルム
6 ハードコート層
20 下地層
10 ニッケル薄膜
11 リード部
12 測温抵抗部
122,123 センサ配線
19 コネクタ
102 導電フィルム
110 温度センサフィルム
Claims (8)
- 樹脂フィルム基材の一主面上にニッケル薄膜を備え、
前記ニッケル薄膜は、ニッケルの(111)面の面間隔が0.2040nm未満である、温度センサ用導電フィルム。 - 前記樹脂フィルム基材と前記ニッケル薄膜の間に無機下地層を備える、請求項1に記載の温度センサ用導電フィルム。
- 前記無機下地層は、少なくとも1層のシリコン系薄膜を含む、請求項2に記載の温度センサ用導電フィルム。
- 前記下地層が酸化シリコン薄膜を含み、前記ニッケル薄膜が、前記酸化シリコン薄膜に接している、請求項2または3に記載の温度センサ用導電フィルム。
- 前記ニッケル薄膜の厚みが、100~500nmである、請求項1~4のいずれか1項に記載の温度センサ用導電フィルム。
- 前記ニッケル薄膜の抵抗温度係数が4000ppm/℃以上である、請求項1~5のいずれか1項に記載の温度センサ用導電フィルム。
- 請求項1~6のいずれか1項に記載の導電フィルムを製造する方法であって、
前記ニッケル薄膜をスパッタ法により成膜する、導電フィルムの製造方法。 - 樹脂フィルム基材の一主面上にパターニングされたニッケル薄膜を備え、
前記ニッケル薄膜が、細線にパターニングされており温度測定に用いられる測温抵抗部と、前記測温抵抗部に接続され、前記測温抵抗部よりも大きな線幅にパターニングされているリード部とにパターニングされており、
前記ニッケル薄膜は、ニッケルの(111)面の面間隔が0.2040nm未満である、温度センサフィルム。
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| CN202080069058.5A CN114467151A (zh) | 2019-10-01 | 2020-09-16 | 温度传感器膜、导电膜及其制造方法 |
| US17/764,594 US12146799B2 (en) | 2019-10-01 | 2020-09-16 | Temperature sensor film, conductive film and method for producing same |
| KR1020227014207A KR102954674B1 (ko) | 2019-10-01 | 2020-09-16 | 온도 센서 필름, 도전 필름 및 그 제조 방법 |
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| EP4040129A1 (en) | 2022-08-10 |
| TWI867055B (zh) | 2024-12-21 |
| EP4040129A4 (en) | 2023-10-04 |
| TW202124925A (zh) | 2021-07-01 |
| EP4040129B1 (en) | 2025-07-09 |
| CN114467151A (zh) | 2022-05-10 |
| JP2021056160A (ja) | 2021-04-08 |
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