JP2006042240A - Transfer type antenna and its manufacturing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a transfer type antenna and its manufacturing method in which a film antenna can be configured without requiring a base material conventionally having a significant role, conductivity or appearance is hardly changed by deterioration due to the passage with time, such as oxidation and only a fine pattern portion can be easily constructed in the case of construction. <P>SOLUTION: A transfer antenna comprises a conductive pattern layer for forming antenna wiring between a protection pattern layer and an adhesion pattern layer, a protecting film or carrier support is provided at the side of the protection pattern layer, a release film is provided at the side of the adhesion pattern layer and after the release film is peeled and the adhesion pattern layer is adhered on a surface of a transparent substrate, the protecting film is peeled, so that an antenna can be imparted to the transparent substrate. In comparison with a conventional film antenna, there is no support and antenna design of thin line is enabled, thereby improving visibility for a driver or the like. Furthermore, since no base material is included, there is also effect of suppressing deterioration of light-resistance appearance and beautiful appearance. Moreover, high-temperature heating treatment can be performed during manufacturing steps, thereby improving characteristics of a conductive pattern layer and the protection pattern layer, improving antenna characteristics and durability and widening degrees of freedom in material selection and patter design. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an antenna device suitable for being retrofitted on an automobile window glass or the like, and more particularly to a transfer type antenna capable of providing an antenna on a car glass by transfer and a manufacturing method thereof.

  In recent years, automobiles are equipped with antenna devices for receiving various radio waves such as AM / FM radio, radio, telephone, TV, and GPS. As one of such radio wave receiving antennas, there is a type of film antenna that is attached to a window glass of a car. This film antenna has a receiving element surface provided with a radio wave receiving portion composed of a linear receiving conductive pattern on a transparent film substrate, and the conductive pattern has a shape suitable for a desired radio wave. As a forming method, it is formed by printing or dispenser using conductive ink such as pattern etching of Cu foil or Ag paste. On the other hand, a transparent adhesive pattern layer or double-sided tape is provided on the back surface of the receiving element surface of the transparent base material, and is used by being attached together with the transparent base material on the window glass surface of the car. Therefore, in the conventional film antenna, it is necessary to select a highly transparent material and increase the transparency of the film antenna in order not to disturb the driver's view. Further, the substrate other than the reception conductive pattern portion is removed by removal or the like to provide an opening so that the field of view is not hindered. For example, Patent Documents 1 and 2 describe such a film antenna.

  FIG. 6 is an enlarged cross-sectional model view illustrating the structure of a transfer body that can provide such a conventional film antenna configuration. As schematically shown in FIG. 6, this conventional transfer body includes a conductive pattern layer 2 and a protective pattern layer 3 that provide an antenna pattern on the upper surface of the transparent substrate 1, and an adhesive layer 4 on the lower surface of the transparent substrate 1. The protective film 5 is provided on the protective pattern layer 3 side, and the release film 6 is provided on the adhesive layer 4 side. In such a conventional transfer body, the peeling film 6 is peeled off, the transparent substrate 1 is attached to the window glass of the car via the adhesive layer 4, and the protective film 5 is peeled off. Can be provided.

  In Patent Document 3, the first conductor pattern layer, the second insulator pattern layer, and the third conductor pattern layer, which are sequentially laminated on the transfer film, are arranged on the vehicle interior side of the in-vehicle glass plate. Describes a vehicle-mounted antenna formed by a transfer printing method.

Japanese Patent Application No. 2003-249807 JP 2003-115713 A JP 2001-211020 A

  In the case of a conventional film antenna, there are limitations on the configuration and dimensions of the antenna pattern, the selection of materials used, etc. so as not to hinder the driver's view. Moreover, Article 29 of the safety standard for automobile window glass states that “the visible light transmittance in the portion related to the field of view can be ensured to be 70% or more”. Therefore, the sticking part other than the wiring part has a visible light transmittance of 70% or more as transparency. In addition, regarding the radio wave receiving antenna attached to the front glass in Appendix 1 of JASO M 501-94, the mounting portion of the antenna is within 100 mm from the outer periphery of the glass opening.

  Since the wiring portion of the antenna configuration is made of a metal material and is opaque, the wiring width is set to 0.25 mm or less so as not to disturb the driver's field of view.

  Particularly in the antenna configuration, the base material plays an important role as a support at the time of manufacture and after construction, and requires a certain amount of thickness, so that the influence on transparency is great. Therefore, it is necessary to select a base material having a high transmittance and a low haze value.

  In the film antenna manufacturing process, the conductive pattern is formed by etching a Cu foil, printing a conductive paste, a dispenser, or the like. At this time, heat treatment or chemical immersion may be performed in the pattern forming step, which may deteriorate the transparency of the substrate. Especially when using conductive paste by printing, high conductive properties can be obtained by high-temperature heat treatment, and the mechanical properties of the coating can be improved, but if you use a transparent flexible resin substrate such as PET, In the high-temperature heat treatment region, a low-molecular oligomer in the base material is precipitated, and a phenomenon that the transparency of the base material is lowered occurs.

  As in the example described above, it is necessary to pay attention so as not to impair the transparency of the transparent substrate in the manufacturing process of the film antenna, and there is a problem that the selection of the material to be used and the degree of freedom in the manufacturing process are low.

  Also, in order not to obstruct the driver's field of view, when the portion along the antenna reception conductive pattern is made into an opening by punching and only the conductive pattern portion is attached, the width of the antenna configuration after extraction is as narrow as possible For example, it is desirable that the width is 0.5 mm or less because it does not interfere with the field of view, but it is difficult to cut with a width of 0.5 mm or less in the punching process using a blade mold, etc. The construction of only the pattern portion causes a problem that it requires a technician's skill. Also, after the antenna is attached to the glass, wipe the paper with a cloth or paper, and the paper or other fibers will adhere to the edge of the adhesive layer. Adhering to the aesthetics and visibility may be reduced. When a wide antenna pattern is used, this phenomenon tends to cause deterioration in visibility, appearance, and aesthetics because the attached dirt is conspicuous.

  Patent Document 3 discloses a transfer-type antenna configuration useful for solving the above-described problems. However, the proposed transfer-type antenna configuration is effective when the antenna is installed from the beginning at the time of manufacturing the car, but it is difficult for general users to perform the sintering process when the antenna is required later. There is a problem in workability. Moreover, since sintering is performed by high-temperature treatment, the supportability after construction is good, but it cannot be said that the manufacturing method is simple. In addition, since the conductive pattern layer is exposed, there is a problem in that the conductivity and appearance change due to deterioration with time such as oxidation.

  Therefore, the object of the present invention is to form a film antenna that does not require a base material that has played an important role in the past, and hardly changes in conductivity and appearance due to deterioration over time such as oxidation. It is an object of the present invention to provide a transfer antenna that can be easily constructed and a method for manufacturing the same.

  In order to solve the above-mentioned problems, the transfer antenna according to the present invention has a characteristic configuration in which the transparent substrate serving as a support, which has played an important role in the past, is removed from the antenna configuration, and the conductive pattern layer forming the antenna wiring is protected. It has a transfer type antenna structure sandwiched between a pattern layer and an adhesive pattern layer. A protective film is provided on the protective pattern layer side of this transfer type antenna structure, and a release film is provided on the adhesive pattern layer side. The transfer antenna is characterized in that the protective film is peeled off after the antenna structure is bonded to the surface of a transparent substrate such as car glass. For this reason, it is not included in the structure after the base material is applied to the glass for a vehicle, and the layer structure is simple, the interface is small, and high transparency is easily obtained as compared with the conventional film antenna structure.

According to an embodiment of the present invention, the linear expansion coefficient of the protective pattern layer is 1 × 10 ⁻³ / K or less at 25 to 80 ° C. in order to suppress the occurrence of deterioration such as cracks with respect to temperature changes in the vehicle interior environment. It is a transfer type antenna characterized by being.

The car interior is expected to undergo large temperature changes from high temperatures (about 80 ° C) to low temperatures (-40 ° C) throughout the year. For this reason, in the present invention, the linear expansion coefficient of the protective pattern layer is set to 1 × 10 ⁻³ / K or less, thereby suppressing disconnection and deterioration of the durability of the protective pattern layer due to deformation of the coating film due to heat shock.

  According to another embodiment of the present invention, the transfer type antenna is characterized in that a support pattern layer is provided between the conductive pattern layer and the adhesive pattern layer.

  By forming the support pattern layer so as to cover the conductive pattern layer, it is possible to enhance the adhesion of the adhesive pattern layer and to impart mechanical strength to the antenna configuration. Further, by providing the protective pattern layer and the support pattern layer, not only the supportability after construction but also the supportability against pressure by squeegee at the time of construction is improved, and the workability is also improved.

According to another embodiment of the present invention, the transfer type antenna is characterized in that a linear expansion coefficient of the support pattern layer is 1 × 10 ⁻³ / K or less at 25 to 80 ° C.

  Similar to the protective pattern layer, the support pattern layer must be able to withstand changes in the vehicle environment, and at the same time, has an effect of suppressing shape deformation of the laminated film due to heat shock when an adhesive or the like is used for the adhesive pattern layer. In the case of the conventional antenna configuration, the transparent base material alleviates the influence of the adhesive pattern layer, but since the configuration of the present invention does not have a transparent base material, the support pattern layer suppresses the influence of the adhesive pattern layer and is stable. Improve sexiness.

  Further, according to one embodiment of the present invention, the protective film or the carrier support has flexibility, and a dimensional change rate is 0.3% or less at 150 ° C. for 30 minutes. It is a transfer type antenna.

  The rate of dimensional change is 0.3% or less under an exposure condition of 150 ° C. for 30 minutes. In the manufacturing process of the transfer antenna according to the present invention, the protective film is a carrier film during the manufacturing process. In order to fulfill its role, it suppresses dimensional changes due to thermal shrinkage of the base material, is effective for alignment and pattern accuracy when laminating patterns of each layer, and also deteriorates during storage when it is used as a product, such as curls and wrinkles. There is an effect to prevent the occurrence of.

  The present invention also intends to provide a method for manufacturing a transfer antenna. According to the present invention, the protective pattern layer is patterned on the protective film, and the conductive pattern layer and the adhesive pattern layer are sequentially patterned thereon, or the conductive pattern layer, the support pattern layer, and the adhesive pattern layer are sequentially patterned. After the formation, a transfer antenna manufacturing method is provided in which a release film is attached. By selecting a material having high heat resistance and chemical resistance for the protective film, the degree of freedom in the manufacturing process is increased. In addition, when forming a conductive pattern using a conductive paste, the protective film is subjected to a high-temperature treatment using a flexible material such as PET. Is not a problem to be removed. Moreover, since it can be heat-treated at a high temperature, a coating film having high conductivity and good mechanical properties can be formed, so that it is possible to increase the antenna characteristics and reliability after construction.

  The use of a thin material for the protective film has the advantage of ease of construction. In response to this requirement, the carrier support is bonded to the protective film, and the rigidity is increased, thereby improving the transportability during the manufacturing process and the carrier support bonded at the end of the manufacturing process. By peeling off, a transfer type antenna having a thin protective film can be formed. When using the carrier support, in order to secure the positional accuracy at the time of lamination, it is necessary to suppress the difference in the stipulated dimensional ratio at 150 ° C. between the protective film and the carrier support to 0.3% or less. In this case, since the carrier support is peeled off, the peel strength between the protective film and the carrier support is set to be weaker than the peel strength between the protective film and the protective pattern layer.

  Further, according to the present invention, after the conductive pattern layer is formed on the carrier support, the adhesive pattern layer is formed on the conductive pattern layer, or the support pattern layer and the adhesive pattern layer are formed on the conductive pattern layer and bonded. A transfer characterized by laminating a release film on a pattern layer, then peeling off the carrier support, forming a protective pattern layer on a conductive pattern layer, and laminating a protective film on the protective pattern layer Another method of manufacturing a mold antenna is provided. In this case, since the carrier support does not require transparency, the degree of freedom in selecting the carrier support in the manufacturing process is high.

  According to the present invention, only the pattern portion of the protective pattern layer, the conductive pattern, and the adhesive pattern layer is formed, and only the pattern portion is transferred. The removal process becomes unnecessary, the manufacturing process is simplified, and the yield is improved. Further, the formation accuracy of only the pattern portion can be easily ensured because the pattern width can be easily narrowed by a forming method such as printing.

  Construction of the transfer type antenna of the present invention peels off the release film, presses it over the protective film and attaches it to the car glass surface, and peels off the protective film, so that only the pattern part is attached, This saves you the trouble of removing parts that obstruct the field of view other than the pattern. Moreover, since it is not necessary to provide an opening in the protective sheet, there is no problem in construction even if the pattern width is narrow.

  The present invention will be described in detail below.

  FIG. 1 is an enlarged cross-sectional model view illustrating the structure of a transfer antenna according to Example 1 described later of the present invention. As shown in FIG. 1, the transfer type antenna according to an embodiment of the present invention has an antenna configuration in which a conductive pattern layer 12 forming an antenna wiring is sandwiched between a protective pattern layer 13 and an adhesive pattern layer 14, and is peeled off. By peeling off the film 16 and bonding the adhesive pattern layer 14 to the car glass surface by transfer, and peeling off the protective film or carrier support 15, an antenna can be provided to the car glass. However, such a transfer-type antenna configuration has a problem due to the absence of a substrate as compared with an antenna configuration using a conventional transparent substrate as a support.

  One is support after construction. After being attached to the glass surface for a car, a disconnection is considered as one of the causes for deteriorating the resistance value of the conductive pattern layer 12 in the car interior environment. When a car window is wiped with a cloth or the like after construction, it is assumed that the antenna is also rubbed at the same time. In this case, it is necessary to protect the wiring from being torn by an impact.

  In the protective pattern layer 13 of the present invention, the protective pattern layer is formed in consideration of the support in such a case. Further, the protective pattern layer 13 is formed in order to prevent the wiring from being exposed and the appearance defect and conductivity deterioration due to the metal surface oxidation.

  The type of resin used for the protective pattern layer 13 is not particularly limited. For example, thermoplastic resins such as polyester, acrylic, methacrylic, polycarbonate, polypropylene, polyimide, thermosetting resins such as phenol and epoxy, and UV curing. Resins, silicone resins, and the like can be used, and one or more of the above materials may be used in combination.

Protective pattern layer 13, a temperature change in the vehicle environment, in order to suppress the deterioration occurrence of cracks, it necessary to linear expansion coefficient of less than 1 × 10 ^-3 / K, preferably 5 × 10 ^{- 4} / K or less. The linear expansion coefficient can be determined in accordance with JIS K 7197 using a thermomechanical analyzer in the range of 25 ° C. to 80 ° C. Furthermore, the Tg of the protective pattern layer is desirably 80 ° C. or higher. The film thickness is not particularly limited as long as the mechanical strength as the protective pattern layer can be obtained, but is preferably 3 μm or more, and more preferably 5 μm or more.

  Further, for the purpose of improving the appearance, weather resistance, mechanical strength, preventing oxidation of the conductive pattern layer 12 and adjusting the linear expansion coefficient, a filler or a low molecular weight additive may be mixed.

  The transparency of the protective pattern layer 13 is preferably 85% or more, and more preferably 90% or more so as not to interfere with vision. The haze is preferably 5% or less, and more preferably 2% or less.

  The conductive pattern layer 12 is a material that can be patterned, and is not particularly limited as long as it is a conductive material, and Al, Cu foil, and the like can be used if the pattern is formed by etching. If the pattern is formed by printing or the like, a conductive paint or the like can be used.

  The conductive paint may be mixed with resin or the like in addition to the conductive particles and the dispersion solvent. Alternatively, it is possible to use a coating mainly composed of a conductive polymer. Carbon, Ag, Au, Cu, Ni, ITO, etc. can be used as the conductive particles, and an alloy system or a mixed system of various conductive particles may be used. In order to have high conductivity, a conductive paint mainly composed of Ag is particularly desirable.

  Higher conductivity is preferable because the degree of freedom in pattern design increases. In order to improve conductivity, the higher the film thickness, the better. However, it is set according to the balance between flexibility and coating strength. Usually, it is 3 to 25 μm, preferably 7 to 18 μm.

  The pattern shape is not particularly limited as long as it has a shape suitable for receiving a desired radio wave, and is preferably a small and narrow width shape so as not to obstruct the driver's field of view.

  The adhesive pattern layer 14 is not particularly limited as long as it is a material that is in close contact with the glass surface of a vehicle. A water-based adhesive, a solvent-type adhesive, an emulsion-type adhesive, a latex-type adhesive, a mastic adhesive, a composite adhesive, and the like. Adhesives such as layer adhesives, paste adhesives, foam adhesives, supported film adhesives can be selected, and the curing system is low temperature, medium temperature, high temperature solidified adhesive, hot melt adhesive, heat activated adhesive, heat Sealing adhesives, low temperature, medium temperature, high temperature curable adhesives, self-curing adhesives, contact adhesives, pressure sensitive adhesives, polymerization adhesives, solvent active adhesives, anaerobic adhesives, silicate adhesives, etc. And a thermosetting system, a thermoplastic system, an elastomer system, and a mixed system can be selected.

  The film thickness is not particularly limited as long as the adhesive strength can be obtained, and is usually 5 to 30 μm, preferably about 10 to 25 μm.

  Also, fillers and low molecular weight additives may be mixed for the purpose of improving the appearance, weather resistance, mechanical strength, antioxidant of the conductive pattern layer, and the like.

  The transparency of the adhesive pattern layer 14 is preferably 85% or more, and more preferably 90% or more. The haze is preferably 5% or less, and more preferably 2% or less.

  FIG. 3 is an enlarged cross-sectional model view illustrating the structure of a transfer antenna according to a third embodiment of the present invention which will be described later. FIG. 4 is an enlarged view illustrating the structure of a transfer antenna according to a fourth embodiment of the present invention which will be described later. FIG. As shown in FIGS. 3 and 4, when the support pattern layer 11 is provided between the conductive pattern layer 12 and the adhesive pattern layer 14, the influence of the adhesive pattern layer 14 can be suppressed and the stability can be improved. . The resin type used for the support pattern layer 11 is not particularly limited. For example, thermoplastic resins such as polyester, acrylic, methacrylic, polycarbonate, polypropylene, and polyimide, thermosetting resins such as phenol and epoxy, and UV curable resins. Silicone resin or the like can be used, and one or more of the above materials may be used in combination.

In order to suppress the occurrence of cracks and the like with respect to temperature changes in the vehicle interior environment, a linear expansion coefficient of 1 × 10 ⁻³ / K or less is required, and 5 × 10 ⁻⁴ / K or less is particularly desirable. The Tg of the coating film is desirably 80 ° C. or higher. The linear expansion coefficients of the support pattern layer 11 and the protective pattern layer 13 are preferably approximated. By providing the support pattern layer 11, the adhesive pattern layer 14 can be widely selected from an adhesive system to a thermoplastic resin and a curable resin.

  In addition, fillers and low molecular weight additives may be mixed for the purpose of improving the appearance, weather resistance, mechanical strength, preventing oxidation of the conductive pattern layer, and adjusting the linear expansion coefficient.

  The transparency of the support pattern layer 11 is preferably 85% or more, and more preferably 90% or more.

  The protective film 15 is preferably a flexible film from the viewpoint of workability. The material is not particularly limited as long as it is a flexible plastic substrate, and films such as polyethylene, PP, PC, acrylic, PET, PEN, PEI, and polyimide can be used. As long as the protective film has a peelability from the laminated coating film, the film may be a single film, or a slightly adhesive layer or a release layer such as a silicone-based or acrylic-based layer may be provided to improve the peelability.

  In consideration of passing the high temperature treatment step during the manufacturing process, high dimensional stability of the transport film 15 (protective film or carrier support) is required. According to the dimensional stability evaluation method of the base material of JISC2151, the dimensional stability factor of the support must be 0.3% or less, preferably 0.1% or less, at 150 ° C. for 30 minutes. The method for setting the dimensional standardization rate to 0.3% or less is not particularly limited, and a method of exposing a film sheet to a thermostatic bath, passing through a high temperature furnace such as an IR furnace in a roll shape, Shrinkage can improve dimensional stability.

  The release film 16 has a role of protecting the adhesion of the adhesive pattern layer 14 due to tucking and the antenna configuration, and is preferably a flexible film from the viewpoint of workability. The flexible film material is not particularly limited, and films such as polyethylene, PP, PC, acrylic, PET, PEN, PEI, and polyimide can be used. The release film 16 may be a single film as long as it has a peelability from the laminated coating film, and may be provided with a slightly adhesive layer or a release layer such as a silicone-based or acrylic-based layer in order to improve the peelability.

  Next, a method for manufacturing the on-vehicle transfer type antenna of the present invention having the above-described structure will be described. According to the manufacturing method of the present invention, the protective pattern layer 13 is patterned on the protective film 15, and in the case of the structure shown in FIG. 1, the conductive pattern layer 12 and the adhesive pattern layer 14 are sequentially patterned thereon. In the case of forming or the structure as shown in FIG. 3, the conductive pattern layer 12, the support pattern layer 11, and the adhesive pattern layer 14 are sequentially formed, and then the release film 16 is bonded.

  The protective film 15 is preferably subjected to a heat treatment in order to improve dimensional stability. As a heat treatment method for the protective film 15, the same method, temperature and time conditions as the highest heat treatment temperature conditions when forming the protective pattern layer 13, the conductive pattern layer 12, the support pattern layer 11, and the adhesive pattern layer 14 are set. Is preferred.

  In the case where a material having a thin thickness of the protective film 15 is used, a carrier support is bonded to the protective film 15 to increase the rigidity and can be used at the time of manufacture. The carrier support does not need transparency because it is peeled off after production or during production. Since a highly rigid film is easy to handle during conveyance in the manufacturing process, manufacturing is facilitated by bonding and using a carrier film having a thickness of 50 μm or more.

  Further, according to another manufacturing method of the present invention, after forming the conductive pattern layer 13 on the carrier support, in the case of the structure shown in FIG. 1, the adhesive pattern layer 14 is formed on the conductive pattern layer 12. In the case of forming or a structure as shown in FIG. 3, the support pattern layer 11 and the adhesive pattern layer 14 are formed on the conductive pattern layer 12, and the release film 16 is bonded onto the adhesive pattern layer 14. The carrier support is peeled off, the protective pattern layer 13 is formed on the conductive pattern layer 12, and the protective film 15 is bonded to the protective pattern layer 13. FIG. 4 shows a cross-sectional structure of a structure manufactured by such another manufacturing method when the support pattern layer 11 is provided as in the structure of FIG.

  In the present invention, only the pattern portions of the protective pattern layer, the conductive pattern, and the adhesive pattern layer are formed on the protective film or the carrier support.

  The method for forming the protective pattern layer, the conductive pattern layer, the support pattern layer, and the adhesive pattern layer is not particularly limited, but is effective because the film forming method by printing is simple and can be manufactured at low cost. . The printing machine can use screen printing, and the form of the film may be either a sheet form or a roll form. When the rigidity of the film is required, a film on which a carrier film is bonded is used.

  The film is preheated to stabilize the dimensions. In the case of a sheet, it can be exposed to a thermostat, etc., and the films can be laminated and heat-treated in a lump. When a roll-shaped film is used, it is possible to obtain dimensional stability by passing the roll through a heat treatment furnace in advance. A printing plate for each layer is formed by an antenna pattern shape suitable for a desired received radio wave.

  A protective pattern layer is formed by pattern printing on a carrier film or a protective film by screen printing, and a coating solvent is volatilized through a drying furnace to form a coating film. If UV curable resin is used, cure by UV irradiation. Similarly, the conductive pattern layer, the support pattern layer, and the adhesive pattern layer are sequentially printed, and the coating solvent is volatilized through a drying furnace to form a coating film. When a material that requires thermosetting is selected for each layer, a method of curing by heat-curing treatment after forming each layer or by forming a heat treatment in a lump after forming all the layers can be employed.

  After forming the adhesive pattern layer, the release film is laminated on the adhesive pattern layer surface. The laminate can be laminated in various forms such as sheet-to-sheet, roll-to-sheet, roll-to-roll. Finally, cutting or punching to a desired size is performed. A transfer antenna can be formed by the above method.

Examples Specific examples of the present invention will be described below. The present invention is not limited to these examples.

Example 1
As the protective film, a PET film “T60” (manufactured by Toray Industries, Inc.) was heat-treated at 160 ° C. for 30 minutes and used with a dimensional stability of 0.01 to 0.1%. For protection pattern layer, UV curing resin paint "Reicure GA4100" (manufactured by Jujo Chemical Co., Ltd.), width: 0.5mm, size: 10mm x 300mm rectangular antenna pattern, size: 50mm x 50mm transparency Pattern for evaluation, size: 50mm x 50mm pencil hardness evaluation pattern patterned printing plate for protective layer (Fig. 2), screen printing to form a thickness of 5μm, and UV curing with UV irradiation device It was. The linear expansion coefficient of the protective pattern layer after curing was 1.03 × 10 ⁻⁴ / K at 80 ° C. The conductive pattern uses conductive paint "DW351H30" (manufactured by Toyobo Co., Ltd.), width: 0.25mm, size: 100mm x 300mm antenna pattern, size 1mm x 100mm resistivity evaluation pattern, size 50mm x 50mm Using a printing plate for conductive layer on which a pattern for pencil hardness evaluation was patterned, a conductive layer printing plate was formed with a thickness of 12 μm by screen printing, and heat treatment was performed in a hot air dryer at 160 ° C. for 30 minutes. The adhesive pattern layer uses "Epicron EXA-192" (Dainippon Ink Industries Co., Ltd.) as a thermoplastic resin, width: 0.5mm, size: 100mm x 300mm antenna pattern, size: 50mm x 50mm transparency Using an adhesive layer printing plate on which the pattern for evaluation was patterned, it was formed with a thickness of 15 μm by screen printing. Further, a PET film “LE952” (manufactured by Toyo Ink Manufacturing Co., Ltd.) having a slightly adhesive layer as a release film on the adhesive pattern layer was bonded to the entire surface to produce a transfer antenna. FIG. 1 shows a schematic cross-sectional view of the produced sample.

Example 2
A conductive type “XA-9053” (manufactured by Fujikura Kasei Co., Ltd.) having a low resistivity was used as the conductive pattern, and a transfer type antenna was prepared in the same manner as in Example 1 with a thickness of 5 μm.

Example 3
After the protective pattern layer and the conductive pattern layer were formed by the same method as in Example 1, UV curable resin paint “Reicure GA4100” (manufactured by Jujo Chemical Co., Ltd.) was screen printed as the support pattern layer. mm, size: 100 mm x 300 mm antenna pattern, size: 50 mm x 50 mm transparency evaluation support pattern patterned printing plate for support layer (Fig. 2), and screen printing to form a thickness of 12 μm respectively. Then, UV curing was performed with a UV irradiation device. The linear expansion coefficient of the support pattern layer after curing was 1.03 × 10 ⁻⁴ / K. The adhesive pattern layer was formed in a thickness of 15 μm using the adhesive “SK Dyne 1429F” (manufactured by Soken Chemical Co., Ltd.) in the same manner as in Example 1. Next, a release film was formed by the same method as in Example 1 to produce a transfer antenna. FIG. 3 shows a schematic cross-sectional view of the prepared sample.

Example 4
Transparent PET “T60” (manufactured by Toray Industries, Inc.) was heat-treated with a hot air drier at 160 ° C. for 30 minutes on the carrier support to obtain a dimensional stability of 0.01 to 0.1%. A conductive paint “XA-9053” (manufactured by Fujikura Kasei Co., Ltd.) was used on the carrier support and formed in the same manner as in Example 2. A UV curable resin paint “Reicure VX4700” (manufactured by Jujo Chemical Co., Ltd.) is formed as a supporting pattern layer in the same manner as in Example 3 with a thickness of 12 μm, and UV curing is performed with a UV irradiation device. It was. The linear expansion coefficient of the support pattern layer after curing was 9.0 × 10 ⁻⁴ / K. Furthermore, after providing an adhesive pattern layer and a release film in the same manner as in Example 3, the carrier support described above was peeled from the conductive pattern layer, and a UV curable resin paint “Reicure VX4700” was formed as a protective pattern layer on the conductive pattern layer. Screen printing using a printing plate for protective layer (made by Jujo Chemical Co., Ltd.) with a pattern of antenna pattern of width: 0.6mm, size: 100mm x 300mm, and pattern for transparency evaluation of size: 50mm x 50mm by screen printing With a thickness of 12 μm, UV curing was performed with a UV irradiation device. The linear expansion coefficient of the protective pattern layer after curing was 9.0 × 10 ⁻⁴ / K. “LE952” (manufactured by Toyo Ink Mfg. Co., Ltd.) in which a slightly adhesive layer was provided on PET as a protective film on the surface of the protective pattern layer was bonded to produce a transfer antenna. FIG. 4 shows a schematic cross-sectional view of the produced sample.

Comparative Example 1
Transparent PET “T60” (manufactured by Toray Industries, Inc.) was used as the substrate. Since the heat treatment temperature that can be used without impairing the transparency of the transparent PET is 130 ° C. or less, the dimensional stability was set to 0.05 to 0.15% by exposure to a hot air dryer at 120 ° C. for 30 minutes. A conductive pattern layer was formed on the transparent PET by heat treatment at 120 ° C. for 30 minutes by the same method as in Example 1. Next, a protective pattern layer was formed by the same method as in Example 1. Next, “LE952” (manufactured by Toyo Ink Mfg. Co., Ltd.) in which a slight adhesion layer was provided on PET as a protective film on the protective pattern layer surface was bonded. Next, on the PET surface opposite to the conductive pattern layer, an adhesive “SK Dyne 1429F” (manufactured by Soken Chemical Co., Ltd.) was used as the adhesive layer, and then applied to the entire surface of the PET with a Mayer bar, then 120 ° C-30 min It formed by heat-processing on condition of this. Next, a PET release film “A31” (manufactured by Teijin Limited) having a release layer on the adhesive layer surface was bonded to the entire surface. Finally, a 2 mm wide antenna pattern was punched out with a big blade to produce a film antenna. FIG. 6 shows a schematic cross-sectional view of the manufactured sample.

Comparative Example 2
A conductive paint “XA-9053” (manufactured by Fujikura Kasei Co., Ltd.) was used on the transparent PET, and the film antenna was formed by the same method as in Comparative Example 1.

Comparative Example 3
In the same manner as in Example 4, a UV curable resin paint “Reicure SL6100” (manufactured by Jujo Chemical Co., Ltd.) was used as the protective pattern layer and support pattern layer paint, and the thickness was 12 μm. The linear expansion coefficient at 55 ° C. of the protective layer and the support layer was 8.76 × 10 ⁻³ / K. A transfer antenna was formed in the same manner as in Example 4.

  After peeling off the produced release film of each antenna, pressure was applied with a plastic squeegee through the protective film, and the protective film was attached to a glass plate having a thickness of 3 mm.

  Transparency evaluation pattern samples were measured for transmittance and haze by Big Chemie Japan: haze-gard dual, and used as antenna transparency.

  The resistivity evaluation pattern was measured by Taly Hobson: Form Talysurf PGI800, the cross-sectional area was measured.

  A pencil scratch test of the conductive film and the protective film was performed using the pencil hardness evaluation pattern.

  The ease of construction when the release film was peeled off and attached to the glass plate was judged by the antenna evaluation pattern.

  After the construction, the cotton fabric “BEMCOT” (manufactured by Asahi Kasei Co., Ltd.) was used to wipe the entire surface of the antenna 5 times, and then the visibility was visually determined from a location 30 cm away from the glass plate.

  The antenna after construction was subjected to 20 cycles of a thermal shock test at 80 ° C. for 30 minutes to −40 ° C. for 30 minutes, and the appearance of the sample surface after the test was visually confirmed.

  The evaluation results in each example and comparative example are shown in Table 1 in FIG.

  From Table 1 of FIG. 5, since Comparative Examples 1 and 2 include a base material (transparent PET) in the antenna configuration, after performing wiping and cleaning with a cloth after construction, fibers adhere to the pattern edge portion, and aesthetics and visibility Is reduced. By reducing the manufacturing temperature in order to suppress the whitening of PET as a base material as in Comparative Example 1 and Comparative Example 2, the conductivity decreases, and the hardness of the conductive pattern layer and the protective pattern layer also decreases. Yes.

  In Comparative Example 3, since the material having a large linear expansion coefficient is used for the protective pattern layer, the hardness of the protective layer is low and the linear expansion coefficient of the support layer is also high. Therefore, the distortion of the pattern after the thermal shock test is large.

  The sample of Comparative Example 3 was subjected to a punching process for the patterning of the film antenna, and the width was only 2 mm for punching accuracy, so the field of view was not good compared to the transfer type of the Example.

  In the samples of Examples 1 to 4, the protective film and carrier support used as the transport film were whitened by heat treatment at 160 ° C. However, since it peels off at the time of construction or manufacture, the transparency of the antenna after construction is high and the visibility is good because it is a narrow antenna pattern.

  Moreover, since the sample of an Example can heat-process each layer at high temperature, since it is easy to obtain high electroconductivity and high coating-film intensity | strength is obtained, it has the durability after construction.

  Since the antenna samples of Comparative Examples 1 and 2 were subjected to a punching process, the antenna pattern was distorted when being applied to the glass plate, so that the installation was difficult. However, in the sample of the example, the workability was good because the protective film was in a sheet form and only the pattern was transferred in spite of the narrow pattern.

  In the above examples and comparative examples, the dimensional draft rate of the base material (transparent PET), protective film, and carrier support used as the transport film was set to 0.3% or less. I was able to. However, when using a transport film with a dimensional draft ratio of 0.3% or more, after forming the first narrow pattern at 160 ° C, it was difficult to match the position accuracy when printing the second narrow pattern, and many defects occurred. . Moreover, since the antenna configuration including the base materials of Comparative Examples 1 and 2 required a punching process, defects such as protrusion of the adhesive in the adhesive layer and transfer of the adhesive to the blade occurred frequently.

  In the above-described example, the transfer type antenna transferred to the vehicle window glass has been described. However, the transfer type antenna of the present invention is not limited to this and is also applied to the case where the antenna is provided on the same transparent substrate. Similar effects can be obtained.

  The transfer type antenna configuration of the present invention has no support as compared with a conventional film antenna and can be designed with a narrow line antenna. An antenna including a conventional base material has a tendency that the base material is yellowed and whitened in long-term weather resistance. However, the transfer type antenna of the present invention does not include a base material, and thus has an appearance and aesthetics in light resistance. There is also an effect of suppressing deterioration of the material. In addition, since the heat treatment can be performed at a high temperature during the manufacturing process, the characteristics of the conductive pattern layer and the characteristics of the protective pattern layer can be improved, and the antenna characteristics and durability can be improved. Of freedom.

1 is an enlarged cross-sectional model view illustrating the configuration of a transfer antenna according to an embodiment of the present invention. It is the schematic which illustrates the patterning for characteristic evaluation. It is an expanded sectional model diagram which illustrates the structure of the transfer type | mold antenna of another Example of this invention. It is an expanded sectional model diagram which illustrates the structure of the transcription | transfer type antenna of another Example of this invention. It is a figure which shows Table 1 which put together the evaluation result in each Example and a comparative example. It is an expanded section model diagram illustrating the composition of the conventional film antenna.

Explanation of symbols

11 Support Pattern Layer 12 Conductive Pattern Layer 13 Protective Pattern Layer 14 Adhesive Pattern Layer 15 Protective Film or Carrier Support 16 Release Film

Claims (10)

  Between the protective pattern layer and the adhesive pattern layer, provided with a conductive pattern layer forming an antenna wiring, provided with a protective film or carrier support on the protective pattern layer side, and a release film on the adhesive pattern layer side, A transfer type antenna having a configuration in which an antenna can be imparted to the transparent substrate by peeling off the protective film and then bonding the adhesive pattern layer to the surface of the transparent substrate and then peeling off the protective film. 2. The transfer type antenna according to claim 1, wherein a linear expansion coefficient of the protective pattern layer is 1 × 10 ⁻³ / K or less at 25 to 80 ° C. ³ .   The transfer type antenna according to claim 1, further comprising a support pattern layer between the conductive pattern layer and the adhesive pattern layer. 4. The transfer type antenna according to claim 3, wherein a linear expansion coefficient of the support pattern layer is 1 × 10 ⁻³ / K or less at 25 to 80 ° C. 5.   5. The protective film or carrier support has flexibility and a dimensional change rate of 0.3% or less under conditions of 150 ° C. and 30 minutes. 5. The transfer type antenna described.   The transfer antenna according to any one of claims 1 to 5, wherein the transparent substrate is glass for vehicles.   A method for producing a transfer antenna, comprising: forming a protective pattern layer on a protective film; sequentially forming a conductive pattern layer and an adhesive pattern layer thereon; and then bonding a release film to the adhesive pattern layer side.   A transfer mold comprising: forming a protective pattern layer on a protective film; sequentially forming a conductive pattern layer, a support pattern layer, and an adhesive pattern layer thereon; and then bonding a release film to the adhesive pattern layer side. Antenna manufacturing method.   After forming a conductive pattern layer on the carrier support, an adhesive pattern layer is formed on the conductive pattern layer, a release film is bonded to the adhesive pattern layer side, and then the carrier support is peeled off. A method for producing a transfer antenna, comprising: forming a protective pattern layer on a conductive pattern layer; and bonding a protective film to the protective pattern layer side.   After forming a conductive pattern layer on the carrier support, a support pattern layer and an adhesive pattern layer are sequentially formed on the conductive pattern layer, a release film is bonded to the adhesive pattern layer side, and then the carrier support A method for producing a transfer antenna, comprising: peeling a body, forming a protective pattern layer on the conductive pattern layer, and bonding a protective film to the protective pattern layer side.

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