JP5268690B2 - Antenna-integrated heating film - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an antenna integrated type heat generating film having excellent evenness of heat generation. <P>SOLUTION: The antenna integrated type heat generating film 10 includes a band-shaped antenna part 14 formed on a surface of a transparent film body 12 along a longitudinal direction, and a band-shaped heat generating part 16 formed beneath the antenna part 14 along a longitudinal direction of the antenna part 14. The antenna part 14 is formed so as to occupy a predetermined width along one longitudinal side 12A of the film body 12, and includes an antenna conductive layer 18 formed of a metal linear part 19. The heat generating part 16 includes a conductive layer 20 for heat generation arranged in a band shape. The conductive layer 20 for heat generation includes a mesh pattern 24 having many intersections of a grid formed of conductive metal fine wires 22, and a first electrode 26 and second electrode 28 formed approximately parallel and in an approximately same length on both end parts of the mesh pattern 24. A power supply 30 is connected to the first electrode 26 and second electrode 28. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

  The present invention relates to an antenna-integrated heat generating film excellent in heat generation.

  In recent years, there is an increasing need for computerization in the automobile industry. A technology indispensable for realizing information technology of a vehicle is a communication technology with the outside of the vehicle. In the past, AM / FM radio was the mainstream, but as media information such as TV and digital broadcasting has been diversified, it has expanded to ITS-related two-way communication systems such as GPS and ETC, and simply received from the situation. , It is changing to an environment where information can be exchanged. Thus, with the development of in-vehicle media, various types of in-vehicle antennas are used, and a film antenna is known as an antenna that has a small thickness and can be installed on an automobile window glass or the like. (See Non-Patent Document 1 and Patent Document 1).

  On the other hand, as a defroster for automobiles, a method in which an electric resistance wire is put in glass and electricity is passed through is generally used. However, this method has a problem that the electric resistance wire is too conspicuous and the visibility is poor. As a conductive film with excellent transparency, a silver halide photosensitive material is used, and a silver halide emulsion layer is formed so as to have a pattern shape having a conductive part of silver for conductivity and an opening part for ensuring transparency. There are silver salt type conductive films manufactured by pattern exposure (see, for example, Patent Documents 2 to 7). Studies have also been made to use this silver salt type conductive film in a defroster for automobiles.

2004 Patent Distribution Support Chart Electric 30 Vehicle-mounted Planar Antenna http://www.ryutu.inpit.go.jp/chart/H16/denki30/frame.htm

JP 2000-342020 A JP 2004-221564 A JP 2004-221565 A JP 2007-95408 A JP 2006-228469 A JP 2006-332459 A JP 2008-244067 A

  From the above background, there has been a need to integrally form an in-vehicle antenna film and a heat generating film. However, when the antenna portion is provided on a part of the heat generating film, there is a problem that a portion that hardly generates heat is generated, and the heat generation property is not uniform.

  The present invention has been made in view of such problems, and an object of the present invention is to provide an antenna-integrated heat generating film excellent in heat generation uniformity.

As a result of diligent investigations by the present inventors to solve the above-mentioned problems, by forming the heat generating portion into a predetermined shape, an exothermic heat generating film with excellent uniformity of heat generation can be obtained. As a result, the present invention has been completed.
The invention according to claim 1 is an antenna-integrated heat generating film provided on a window glass of a vehicle, wherein the film main body is attached to the window glass, and the film main body is formed along one side of the film main body. and strip-shaped antenna portion which is, together with the film and heating part of the strip that is formed along the antenna portion to the body, was closed, and a mesh pattern in which the heating portion is formed of a thin metal wire, the antenna portion A plurality of linear portions thicker than the thin metal wires, and between the plurality of linear portions and in a region around the plurality of linear portions are made of fine metal wires and do not energize electricity. A pattern is formed.

According to the first aspect of the present invention, the film main body is provided with a band-shaped antenna portion formed along one side of the film main body, and the film main body includes a band-shaped heat generating portion formed along the antenna portion. Is provided. This makes it difficult for the difference in conductivity to occur depending on the portion of the belt-like heat generating portion, and the heat generating portion can generate heat almost uniformly.
In addition, the heating part includes a mesh pattern made of fine metal wires, and the antenna part includes a plurality of linear parts that are thicker than the fine metal wires of the heating part. Between the plurality of linear portions of the antenna portion and in the area around the plurality of linear portions, a non-energized mesh pattern that is made of a thin metal wire and does not energize electricity is formed. It is visually recognized that a non-energizing mesh pattern is formed around the entire periphery. For this reason, compared with the case where the non-energizing mesh pattern is not formed, the antiglare property is improved and the appearance is improved.

  The invention according to claim 2 is the antenna-integrated heat generating film according to claim 1, wherein the heat generating portion includes a heat generating conductive layer provided with electrodes at both ends, and the electrode is one side of the film main body. The electrodes are formed in parallel and the same length.

  According to the invention of claim 2, the heat generating portion includes a heat generating conductive layer provided with electrodes at both ends, and the electrodes at both ends are arranged in a direction intersecting with one side of the film body, They are parallel and have the same length. As a result, a difference in the amount of conductivity is more unlikely to occur depending on the portion of the heat generating conductive layer, and the uniformity of heat generation is further improved.

  According to a third aspect of the present invention, in the antenna-integrated heat generating film according to the first or second aspect, at least one of the heat generating portion and the antenna portion exposes a silver salt-containing layer containing silver halide. And having a number of continuous fine metal wires formed by developing, the width of the fine metal wires being 1 μm or more and 40 μm or less, and the arrangement interval of the fine metal wires being 0.1 mm or more and 50 mm or less To do.

  According to the third aspect of the present invention, at least one of the heat generating portion and the antenna portion includes a large number of continuous metal fine wires formed by exposing and developing a silver salt-containing layer containing silver halide. Have. For example, both the heat generating portion and the antenna portion can be formed by exposing and developing at the same time, thereby improving the production efficiency and reducing the cost. In addition, by setting the width of the fine metal wires and the arrangement interval of the fine metal wires in the above range, the fine metal wires become difficult to see, and the transparency of the antenna-integrated heat generating film is improved.

According to a fourth aspect of the present invention, in the antenna-integrated heat generating film according to any one of the first to third aspects, the surface resistance of the heat generating portion is 10 ohm / sq or more and 500 ohm / sq or less. It shall be.

According to the fourth aspect of the present invention, the heat generating portion can be raised to an appropriate temperature by setting the surface resistance of the heat generating portion within the above range.

  According to the antenna-integrated heat generating film of the present invention, the heat generating portion can generate heat almost uniformly.

It is a top view which shows the whole structure of the antenna integrated heat generating film which concerns on 1st Embodiment. It is a perspective view which shows the state which formed the mesh-shaped pattern on the transparent film. It is a perspective view which shows the state which formed the 1st electrode and the 2nd electrode in the both ends of the mesh-shaped pattern on a transparent film. FIGS. 4A to 4E are process diagrams showing an example (first method) of forming a mesh pattern of the heat generating portion or a conductive layer of the antenna portion according to the first embodiment. It is a top view which shows the whole structure of the antenna integrated heat generating film which concerns on a 1st comparative example. It is a top view which shows the whole structure of the antenna integrated heat generating film which concerns on a 2nd comparative example. It is a top view which expands and shows a part of antenna part of the antenna integrated heat generating film which concerns on 2nd Embodiment. It is a top view which expands and shows a part of antenna part of the antenna integrated heat generating film which concerns on 3rd Embodiment. It is a top view which shows the whole structure of the antenna integrated heat generating film which concerns on 4th Embodiment.

[First Embodiment]
Hereinafter, an antenna-integrated heat generating film according to a first embodiment of the present invention will be described with reference to FIGS.

  As shown in FIG. 1, the antenna-integrated heat generating film 10 includes a transparent film body 12 formed in a rectangular shape and a longitudinal side 12 </ b> A of the film body 12 on the upper surface of the film body 12. A formed strip-shaped antenna unit 14 and a strip-shaped heat generating unit 16 formed along the antenna unit 14 below the antenna unit 14 in the figure are provided.

  The antenna portion 14 is formed to occupy a predetermined width along one side 12 </ b> A in the longitudinal direction of the film body 12, and includes an antenna conductive layer 18 formed of a metal linear portion 19. In the antenna conductive layer 18, a plurality of horizontal line portions 18B are arranged at substantially equal intervals along the longitudinal direction inside the rectangular frame portion 18A, and at one end of the upper side of the frame portion 18A, An extending portion 18C extending to the side edge portion is provided. A power supply terminal (not shown) is connected to the end of the extending portion 18C. In the present embodiment, the overall length in the longitudinal direction of the frame portion 18 </ b> A of the antenna conductive layer 18 is formed slightly shorter than the length of one side 12 </ b> A in the longitudinal direction of the film body 12.

  The antenna unit 14 receives radio waves in a predetermined frequency band. For example, the antenna unit 14 can receive radio waves in the FM band of 76 to 90 MHz with a center frequency of 83 MHz. The antenna unit 14 is not limited to the FM band, and may be one that receives radio waves such as AM, TV, and ETC. Further, the width of the linear portion 19 constituting the antenna conductive layer 18 is preferably, for example, 5 μm or more and 2 mm or less, and more preferably 10 μm or more and 1 mm or less.

  The heat generating portion 16 includes a heat generating conductive layer 20 arranged in a belt shape. The heat generating conductive layer 20 has a mesh pattern 24 having intersections of a large number of lattices composed of conductive thin metal wires 22, and a pair of opposing ends (mesh pattern 24) of the mesh pattern 24. The first electrode 26 and the second electrode 28 are formed on both ends.

  The first electrode 26 and the second electrode 28 are formed along the edges of both end portions of the film body 12 and are arranged in a direction orthogonal to the one side 12 </ b> A of the film body 12. Further, the first electrode 26 and the second electrode 28 are formed in substantially parallel and substantially the same length. A power supply 30 is connected to the first electrode 26 and the second electrode 28. The mesh pattern 24 constituting the heat generating conductive layer 20 is formed in a rectangular region between the first electrode 26 and the second electrode 28, and the lower end portion of the mesh pattern 24 in the figure is the film body 12. To the edge of one side 12A. That is, the area surrounded by the entire outer shape of the heat generating conductive layer 20 has the mesh pattern 24 and becomes the heat generating area 34 of the heat generating portion 16.

  As shown in FIG. 3, the antenna-integrated heat generating film 10 includes an adhesive layer 44 on the surface opposite to the surface on which the antenna portion 14 and the heat generating portion 16 of the film body 12 are formed, and covers the adhesive layer 44. A release sheet 46 is provided. The antenna-integrated heat generating film 10 is used by peeling the release sheet 46 and attaching the adhesive layer 44 to a vehicle window glass (for example, a rear glass of a vehicle).

  Conventionally, the surface heating element used in the rear glass and the headlamp cover is usually heated by using one linear heating element for a small heater such as a headlamp cover, and no more than 10 linear heating elements for a rear glass having a large heater area. The wire heating element was drawn around the entire surface. Since the current flows along the line from one end of the wire heating element to the other end, if all the wire heating elements are the same material and have the same line width and thickness, the amount of heat generated depends on the existence density of the lines. Is decided. In other words, if a heating element is provided so as to have the same density everywhere, a uniform heat generation can be obtained regardless of the shape of the region to be heated.

  However, when the wire heating element is routed as described above, there is a problem that the line heating element can be easily visually recognized with the naked eye and obstructs the field of view when used in a window glass of a vehicle. Therefore, in the present embodiment, the mesh pattern 24 is formed to constitute the heat generating portion 16 having high transparency. However, in the highly transparent heat generating portion 16 having such a mesh pattern 24, there are an infinite number of paths through which current flows, and current concentrates on paths that have low resistance and are easy to flow. For this reason, it is necessary to devise in order to uniformly heat the region where heat generation is desired.

  The method for uniformly heating the heat generating portion 16 having high transparency could be achieved as follows.

  That is, the mesh pattern 24 of the heat generating conductive layer 20 is formed so that the heat generating region 34 has a substantially rectangular shape, and the strip-shaped first electrode 26 and the second electrode 28 are provided at both ends of the mesh pattern 24. A voltage is applied between the first electrode 26 and the second electrode 28 to pass a current. By making the mesh pattern 24 substantially rectangular, heat can be generated almost uniformly.

  Further, in the case of the configuration in which the linear heating element is drawn in a zigzag manner, there is a problem in that a potential difference occurs between adjacent conductive wires, which causes migration, but in the present embodiment, the conductive metal thin wire 22 is used. A mesh-like pattern 24 having intersections of a large number of lattices is formed. Since adjacent metal thin wires are short-circuited from the beginning, there is no problem even if migration occurs.

  Further, in the case of the heat generating part 16 having high transparency, the electric resistance increases in proportion to the distance between the first electrode 26 and the second electrode 28 facing each other. When the voltage is constant, the calorific value changes in inverse proportion to the electrical resistance. That is, the greater the electrical resistance, the smaller the amount of heat generated. Therefore, it is ideal that the first electrode 26 and the second electrode 28 are arranged in parallel.

  The reason that snow and frost become a problem is considered that the environmental temperature is mainly between minus 10 ° C. and plus 3 ° C. This is because, at minus 10 ° C. or lower, there is almost no moisture in the atmosphere, so frost as well as snowfall are reduced. In order to raise the surface temperature of the window glass (not shown) of the vehicle from minus 10 ° C. to a minimum temperature of 3 ° C. which is preferable for melting frost and snow, if the heat generation distribution (variation) is zero, the temperature can be raised by an average of 13 ° C. However, if the heat generation distribution (variation) is assumed to be plus or minus 5 ° C, even if the temperature rises by 13 ° C on average, the minimum temperature of the cover surface is below 3 ° C, so it is necessary to raise the temperature by 18 ° C on average. is there. That is, as the heat generation distribution (variation) is reduced, it is possible to contribute to energy saving.

  For example, if the heating increase temperature (temperature increase width) by the heat generating part 16 having high transparency can be reduced to a minimum of 13 ° C., a maximum of 19 ° C., and an average of 16 ° C., the energy can be reduced by about 2 ° C. compared to the above-described example. It is advantageous and preferable for energy saving.

  The surface resistance of the heat generating portion 16 is preferably 10 ohm / sq or more and 500 ohm / sq or less. Moreover, it is preferable that the electrical resistance of the heat generating part 16 is 12 ohms or more and 120 ohms or less. Thereby, the average heating rise temperature by the heat generation part 16 can be made into suitable temperature (for example, 16 degreeC), and the snow cover etc. which adhered to the heat generation part 16 of the antenna integrated heat generating film 10 can be removed.

  Moreover, in this embodiment, it is preferable that the width | variety of the metal fine wire 22 of the mesh-shaped pattern 24 is 1 micrometer or more and 40 micrometers or less. Thereby, it becomes difficult to see the mesh pattern 24, and transparency can be improved.

  The pitch of the fine metal wires 22 of the mesh pattern 24 is preferably 0.1 mm or more and 50 mm or less. This is because the width of the fine metal wire 22 of the mesh pattern 24 is 1 μm or more and 40 μm or less, the surface resistance of the heat generating portion 16 is 10 ohm / sq or more and 500 ohm / sq or less, and the electric resistance of the heat generating portion 16 is 12 This is a preferable numerical range in the case of ohms or more and 120 ohms or less.

  Next, a method for manufacturing the antenna-integrated heat generating film 10 will be described with reference to FIGS.

  First, as shown in FIG. 2, a mesh pattern 24 having intersections of a large number of lattices composed of conductive thin metal wires 22 is formed on an insulating transparent film 40. In addition, the rectangular antenna conductive layer 18 formed of the metal linear portions 19 is formed on the transparent film 40.

  Then, as shown in FIG. 3, the 1st electrode 26 and the 2nd electrode 28 are formed in the both ends of the direction orthogonal to the longitudinal direction of the mesh-like pattern 24 of the transparent film 40. As shown in FIG. For example, the 1st electrode 26 and the 2nd electrode 28 are formed by sticking conductive copper tape 42A (it becomes a strip electrode).

  Thereafter, an adhesive layer 44 made of an adhesive is applied to the back surface of the transparent film 40 (the surface opposite to the surface on which the mesh pattern 24 and the antenna conductive layer 18 are formed), and the entire surface of the adhesive layer 44 is applied to the release sheet 46. Cover with. Thereby, the antenna-integrated heat generating film 10 including the antenna portion 14 and the heat generating portion 16 on the transparent film 40 is completed.

  The antenna-integrated heat generating film 10 is attached to the vehicle window glass by peeling off the release sheet 46 and bonding the adhesive layer 44 to the vehicle window glass (for example, rear glass). The connection of the power supply 30 to the first electrode 26 and the second electrode 28 of the heat generating part 16 and the connection of a power supply terminal (not shown) to the antenna conductive layer 18 of the antenna part 14 are performed by connecting the antenna-integrated heat generating film 10 to the vehicle window. This is performed after being attached to glass (not shown).

  Here, several methods (first method to fourth method) for forming the mesh pattern 24 by the fine metal wires 22 and the antenna conductive layer 18 by the metal linear portions 19 on the transparent film 40 are shown in FIGS. This will be described with reference to FIG. Since the method of forming the conductive layer 18 for the antenna by the fine metal wire 22 and the metal linear portion 19 is the same, the mesh pattern 24 and the antenna pattern are used for easy understanding in FIGS. The conductive layer 18 is shown as the same layer. Although not shown, in practice, the line width of the linear portion 19 constituting the antenna conductive layer 18 is larger than the line width of the fine metal wire 22 constituting the mesh pattern 24.

  The first method is a method of forming the mesh pattern 24 and the antenna conductive layer 18 with a metallic silver portion formed by exposing, developing and fixing a silver salt photosensitive layer provided on the transparent film 40. is there.

  Specifically, as shown in FIG. 4A, a silver salt photosensitive layer 58 obtained by mixing silver halide 54 (for example, silver bromide grains, silver chlorobromide grains or silver iodobromide grains) with gelatin 56, as shown in FIG. Is applied onto the transparent film 40. 4A to 4C, the silver halide 54 is expressed as “grains”, but is exaggerated to help the understanding of the present invention. It does not indicate sheath density.

  Thereafter, as shown in FIG. 4B, the silver salt photosensitive layer 58 is subjected to exposure necessary for forming the mesh pattern 24 and the antenna conductive layer 18. In the present embodiment, exposure for forming the mesh pattern 24 and the antenna conductive layer 18 is simultaneously performed. The exposure for forming the mesh pattern 24 and the antenna conductive layer 18 may be performed separately. The silver halide 54 is exposed to light energy and generates minute silver nuclei called “latent image” that cannot be observed with the naked eye.

  Thereafter, development processing is performed as shown in FIG. 4C in order to amplify the latent image into a visualized image that can be observed with the naked eye. Specifically, the silver salt photosensitive layer 58 on which the latent image is formed is developed with a developing solution (both alkaline solution and acidic solution, but usually alkaline solution is large). In this development process, silver ions supplied from silver halide grains or a developer are reduced to metallic silver by using a latent image silver nucleus as a catalyst nucleus by a reducing agent called a developing agent in the developer, and as a result Image silver nuclei are amplified to form a visualized silver image (developed silver 60).

  After the development processing is completed, silver halide 54 that can be exposed to light remains in the silver salt photosensitive layer 58. In order to remove this, a fixing processing solution (acid solution and alkaline solution is used as shown in FIG. 4D). Fixing is performed by using both solutions but usually there are many acidic solutions.

  By performing this fixing process, the metal silver portion 62 is formed in the exposed portion, and only the gelatin 56 remains in the non-exposed portion to become the light transmissive portion 64. That is, the mesh pattern 24 and the antenna conductive layer 18 are formed on the transparent film 40 by a combination of the metallic silver portion 62 and the light transmissive portion 64.

The reaction formula of the fixing process when silver bromide is used as the silver halide 54 and the fixing process is performed with thiosulfate is shown below.
AgBr (solid) + 2 S ₂ O ₃ ions → Ag (S ₂ O ₃ ) ₂
(Easily water-soluble complex)

That is, two thiosulfate ions S ₂ O ₃ and silver ions in gelatin 56 (silver ions from AgBr) form a silver thiosulfate complex. Since the silver thiosulfate complex is highly water-soluble, it is eluted from the gelatin 56. As a result, the developed silver 60 is fixed and remains as the metallic silver portion 62. The metallic pattern 62 and the antenna conductive layer 18 are constituted by the metal silver portion 62.

  The developing process is a process of causing the developing agent to react with the latent image to precipitate the developed silver 60, and the fixing process is a process of eluting the silver halide 54 that has not become the developed silver 60 into water. For details, see T.W. H. James, The Theory of the Photographic Process, 4th ed. , Macmillan Publishing Co. , Inc, NY, Chapter 15, pp. 438-442. See 1977.

  Since the development process is often performed with an alkaline solution, when entering the fixing process from the development process, the alkaline solution adhering to the development process is brought into the fixing process solution (in many cases, an acidic solution). Therefore, there is a problem that the activity of the fixing processing solution changes. Further, there is a concern that an unintended development reaction may further progress due to the developer remaining in the film after leaving the development processing tank. Therefore, it is preferable to neutralize or acidify the silver salt photosensitive layer 58 with a stop solution such as an acetic acid (vinegar) solution after the development processing and before entering the fixing processing step.

  Of course, as shown in FIG. 4E, after forming the metallic silver portion 62 as described above, for example, a plating process (single or combined electroless plating or electroplating) is performed to obtain the metallic silver portion 62. By carrying the conductive metal 66 only on the metal silver part 62 and the conductive metal 66 carried on the metal silver part 62, the mesh pattern 24 and the antenna conductive layer 18 may be formed. .

  Next, in the second method, for example, a photoresist film on a copper foil formed on a transparent film is exposed and developed to form a resist pattern, and the copper foil exposed from the resist pattern is etched to form a copper film. A mesh-like pattern made of foil and an antenna conductive layer are formed.

  Next, the third method is a method of forming a mesh pattern and an antenna conductive layer by printing a paste containing metal fine particles on a transparent film. Of course, by performing metal plating on the printed paste, a mesh-like pattern and an antenna conductive layer may be formed by the paste and metal plating.

  The fourth method is a method of forming a mesh pattern and an antenna conductive layer by printing a metal thin film on a transparent film with a screen printing plate or a gravure printing plate.

  The antenna-integrated heat generating film 10 provided with the antenna portion 14 and the heat generating portion 16 formed by the above method can improve the uniformity of heat generation of the heat generating portion 16 and can eliminate the concern about migration. it can. Moreover, since the antenna part 14 and the heat-emitting part 16 can be formed in the single transparent film 40, cost reduction is realizable. Further, in the first method, the antenna part 14 and the heat generating part 16 can be formed by simultaneous exposure, so that the production efficiency is increased and further cost reduction can be realized. In the antenna-integrated heat generating film 10, the antenna portion 14 composed of the wire-shaped portion 19 that is thicker than the thin metal wire 22 is formed above the heat generating portion 16 composed of the thin metal wire 22. As a window glass, for example, when attached to a rear glass, the field of view on the rear side of the vehicle is not blocked.

  Next, in the heat generating part 16 and the antenna part 14 according to the present embodiment, the method of forming the mesh pattern 24 and the antenna conductive layer 18 using the silver halide photographic light sensitive material which is a particularly preferable aspect will be mainly described. . The fine metal wires 22 of the mesh pattern 24 and the linear portions 19 of the antenna conductive layer 18 can be formed of the same material.

  As described above, the mesh pattern 24 and the antenna conductive layer 18 according to the present embodiment are exposed to a photosensitive material having an emulsion layer containing a photosensitive silver halide salt on the transparent film 40 and subjected to development processing. Thereby, it can form by forming the metal silver part 62 and the light transmissive part 64 in an exposure part and an unexposed part, respectively (refer FIG. 4). If necessary, the metallic silver portion 62 may be further subjected to physical development and / or plating treatment to support the conductive metal 66 on the metallic silver portion 62.

The method of forming the mesh pattern 24 and the antenna conductive layer 18 includes the following three modes depending on the photosensitive material and the form of development processing.
(1) An embodiment in which a photosensitive silver halide black-and-white photosensitive material that does not contain physical development nuclei is chemically or physically developed to form a metallic silver portion 62 on the photosensitive material.
(2) A mode in which a photosensitive silver halide black-and-white photosensitive material containing physical development nuclei in a silver halide emulsion layer is physically developed to form a metallic silver portion 62 on the photosensitive material.
(3) A photosensitive silver halide black-and-white photosensitive material that does not contain physical development nuclei and an image-receiving sheet having a non-photosensitive layer that contains physical development nuclei are overlaid and diffused and transferred to develop a non-photosensitive image of the metallic silver portion 62. Form formed on a sheet.

  The aspect (1) is an integrated black-and-white development type, and a light-transmitting conductive film such as a light-transmitting electromagnetic wave shielding film or a light-transmitting conductive film is formed on the photosensitive material. The resulting developed silver is chemically developed silver or physical developed silver, and is highly active in the subsequent plating or physical development process in that it is a filament with a high specific surface.

  In the above aspect (2), the light-transmitting conductive film is formed on the photosensitive material by dissolving the silver halide near the physical development nucleus and depositing it on the development nucleus in the exposed portion. This is also an integrated black-and-white development type. Although the development action is precipitation on the physical development nuclei, it is highly active, but the specific surface of developed silver is a small sphere.

  In the aspect (3), the light-transmitting conductive film is formed on the image receiving sheet by dissolving and diffusing the silver halide in the unexposed area and depositing on the development nuclei on the image receiving sheet. This is a so-called separate type in which the image receiving sheet is peeled off from the photosensitive material.

  In either embodiment, either negative development processing or reversal development processing can be selected (in the case of the diffusion transfer method, negative development processing is possible by using an auto-positive type photosensitive material as the photosensitive material). .

  The chemical development, thermal development, dissolution physical development, and diffusion transfer development mentioned here have the same meanings as are commonly used in the industry, and are general textbooks of photographic chemistry such as Shinichi Kikuchi, “Photochemistry” (Kyoritsu Publishing) (Published in 1955), C.I. E. K. It is described in "The Theory of Photographic Processes, 4th ed." Edited by Mees (Mcmillan, 1977). Although this case is an invention related to liquid processing, a technique of applying a thermal development system as another development system can also be referred to. For example, the techniques described in Japanese Patent Application Laid-Open Nos. 2004-184893, 2004-334077, and 2005-010752, and Japanese Patent Application Nos. 2004-244080 and 2004-085655 can be applied. it can.

(Photosensitive material)
[Transparent film 40]
As the transparent film 40 used in the manufacturing method of this embodiment, a flexible plastic film can be used.

  Examples of the raw material for the plastic film include polyethylene terephthalate (PET), polyethylene naphthalate (PEN), polyvinyl chloride, polyvinylidene chloride, polyvinyl butyral, polyamide, polyether, polysulfone, polyethersulfone, polycarbonate, and polyarylate. , Polyetherimide, polyetherketone, polyetheretherketone, polyolefins such as EVA, polycarbonate, triacetylcellulose (TAC), acrylic resin, polyimide, or aramid can be used.

  In the present embodiment, polyethylene terephthalate film is suitable as the plastic film from the viewpoint of translucency, heat resistance, ease of handling, and price, but it is appropriately selected depending on the necessity of heat resistance, thermoplasticity, etc. .

[Protective layer]
The photosensitive material used may be provided with a protective layer on the emulsion layer described later. In the present embodiment, the “protective layer” means a layer made of a binder such as gelatin or a high molecular polymer, and is formed in an emulsion layer having photosensitivity in order to exhibit an effect of preventing scratches and improving mechanical properties. The protective layer is preferably not provided for the plating treatment, and even if provided, the protective layer is preferably thin. The thickness is preferably 0.2 μm or less. The formation method of the coating method of the said protective layer is not specifically limited, A well-known coating method can be selected suitably.

[Emulsion layer]
The photosensitive material used in the manufacturing method of the present embodiment preferably has an emulsion layer (silver salt photosensitive layer 58) containing a silver salt as a photosensor on the transparent film 40. In addition to the silver salt, the emulsion layer in this embodiment may contain a dye, a binder, a solvent, and the like as necessary.

<Silver salt>
The silver salt used in this embodiment is preferably an inorganic silver salt such as silver halide, and the silver salt is particularly preferably used in the form of silver halide grains for a silver halide photographic light-sensitive material. Silver halide is excellent in characteristics as an optical sensor.

  The silver halide preferably used in the form of a photographic emulsion of the silver halide photographic light-sensitive material will be described.

  In this embodiment, it is preferable to use silver halide in order to function as an optical sensor, and the technology used in silver halide photographic film, photographic paper, printing plate-making film, photomask emulsion mask, etc. relating to silver halide is used. The present embodiment can also be used.

  The halogen element contained in the silver halide may be any of chlorine, bromine, iodine and fluorine, or a combination thereof. For example, silver halide mainly composed of AgCl, AgBr, and AgI is preferably used, and silver halide mainly composed of AgBr or AgCl is preferably used. Silver chlorobromide, silver iodochlorobromide and silver iodobromide are also preferably used. More preferred are silver chlorobromide, silver bromide, silver iodochlorobromide and silver iodobromide, and most preferred are silver chlorobromide and silver iodochlorobromide containing 50 mol% or more of silver chloride. Used.

  Here, “silver halide mainly composed of AgBr (silver bromide)” refers to silver halide in which the molar fraction of bromide ions in the silver halide composition is 50% or more. The silver halide grains mainly composed of AgBr may contain iodide ions and chloride ions in addition to bromide ions.

  The silver halide emulsion used in this embodiment may contain a metal belonging to Group VIII or Group VIIB. In particular, it is preferable to contain a rhodium compound, an iridium compound, a ruthenium compound, an iron compound, an osmium compound or the like in order to obtain a gradation of 4 or more or to achieve low fog.

The amount of these compounds added is preferably 10 ⁻¹⁰ to 10 ⁻² mol / mol Ag per mol of silver halide, more preferably 10 ⁻⁹ to 10 ⁻³ mol / mol Ag.

  In this embodiment, in order to further improve the sensitivity as an optical sensor, chemical sensitization performed with a photographic emulsion can be performed. As the chemical sensitization method, sulfur sensitization, selenium sensitization, chalcogen sensitization such as tellurium sensitization, noble metal sensitization such as gold sensitization, reduction sensitization and the like can be used. These are used alone or in combination. When the above chemical sensitization methods are used in combination, for example, sulfur sensitization method and gold sensitization method, sulfur sensitization method and selenium sensitization method and gold sensitization method, sulfur sensitization method and tellurium sensitization. A combination of a method and a gold sensitization method is preferable.

<Binder>
In the emulsion layer, a binder can be used for the purpose of uniformly dispersing silver salt grains and assisting the adhesion between the emulsion layer and the support. In the present invention, as the binder, both a water-insoluble polymer and a water-soluble polymer can be used as a binder, but a water-soluble polymer is preferably used.

  Examples of the binder include polysaccharides such as gelatin, polyvinyl alcohol (PVA), polyvinyl pyrrolidone (PVP), starch, cellulose and derivatives thereof, polyethylene oxide, polysaccharides, polyvinylamine, chitosan, polylysine, polyacrylic acid, poly Examples include alginic acid, polyhyaluronic acid, and carboxycellulose. These have neutral, anionic, and cationic properties depending on the ionicity of the functional group.

  The content of the binder contained in the emulsion layer is preferably adjusted so that the Ag / binder volume ratio in the silver salt-containing layer is 1/4 or more, and is adjusted to be 1/2 or more. Is more preferable.

<Solvent>
The solvent used for the formation of the emulsion layer is not particularly limited. For example, water, organic solvents (for example, alcohols such as methanol, ketones such as acetone, amides such as formamide, dimethyl sulfoxide, etc. Sulphoxides, esters such as ethyl acetate, ethers, etc.), ionic liquids, and mixed solvents thereof.

  The content of the solvent used in the emulsion layer of the present invention is in the range of 30 to 90% by mass and in the range of 50 to 80% by mass with respect to the total mass of silver salt, binder and the like contained in the emulsion layer. Preferably there is.

  Next, each process for forming the mesh pattern 24 and the antenna conductive layer 18 will be described.

[exposure]
In the present embodiment, the photosensitive material having the silver salt photosensitive layer 58 provided on the transparent film 40 is exposed. The exposure can be performed using electromagnetic waves. Examples of the electromagnetic wave include light such as visible light and ultraviolet light, and radiation such as X-rays. Furthermore, a light source having a wavelength distribution may be used for exposure, or a light source having a specific wavelength may be used.

  As an exposure method for forming a pattern image, a surface exposure method for irradiating a photosensitive surface with uniform light through a mask pattern to form a mask pattern imagewise, and a pattern irradiation unit by scanning a beam such as a laser beam There is a scanning exposure method in which is formed on the photosensitive surface.

  The exposure can be performed using various laser beams. For example, the exposure in this embodiment is a monochromatic light source such as a gas laser, a light emitting diode, a semiconductor laser, a semiconductor laser, or a second harmonic light source (SHG) that combines a solid state laser using a semiconductor laser as an excitation light source and a nonlinear optical crystal. A scanning exposure method using high-density light can be preferably used, and a KrF excimer laser, ArF excimer laser, F2 laser, or the like can also be used. In order to make the system compact and inexpensive, exposure is more preferably performed using a semiconductor laser, a semiconductor laser, or a second harmonic generation light source (SHG) that combines a solid-state laser and a nonlinear optical crystal. In particular, in order to design a compact, inexpensive, long-life and high-stability device, it is most preferable to perform exposure using a semiconductor laser.

  The method of exposing the silver salt photosensitive layer 58 in a pattern is preferably scanning exposure using a laser beam. In particular, a capstan type laser scanning exposure apparatus described in Japanese Patent Application Laid-Open No. 2000-39677 is preferable. Further, in this capstan method, a DMD described in Japanese Patent Application Laid-Open No. 2004-1224 is optically used instead of beam scanning by rotation of a polygon mirror. It is also preferable to use it for a beam scanning system. In particular, when a long flexible film heater having a length of 3 m or more is produced, it is preferable to perform exposure with a laser beam while conveying the photosensitive material on a curved exposure stage.

  As will be described later, the mesh pattern 24 includes lattice patterns such as triangles, quadrilaterals (diamonds, squares, etc.) and hexagons formed by intersecting substantially parallel straight thin lines, parallel straight lines, zigzag lines, and wavy lines. For example, the structure is not particularly limited as long as a current can flow between electrodes to which a voltage is applied.

[Development processing]
In this embodiment, after the emulsion layer is exposed, further development processing is performed. The development processing can be performed by a normal development processing technique used for silver salt photographic film, photographic paper, printing plate-making film, photomask emulsion mask, and the like. The developer is not particularly limited, but a PQ developer, MQ developer, MAA developer and the like can also be used. Commercially available products include, for example, CN-16, CR-56, CP45X, and FD prescribed by FUJIFILM Corporation. -3, Papitol, a developer such as C-41, E-6, RA-4, D-19, D-72, etc. formulated by KODAK, or a developer included in the kit can be used. A lith developer can also be used.

  As the lith developer, D85 or the like prescribed by KODAK can be used. In the present invention, a metal silver portion, preferably a patterned metal silver portion, is formed in the exposed portion by performing the above exposure and development processing, and a light transmissive portion described later is formed in the unexposed portion.

  The developer used in the development process can contain an image quality improver for the purpose of improving the image quality. Examples of the image quality improver include nitrogen-containing heterocyclic compounds such as benzotriazole. Further, when a lith developer is used, it is particularly preferable to use polyethylene glycol.

  The mass of the metallic silver contained in the exposed portion after the development treatment is preferably a content of 50% by mass or more, and 80% by mass or more with respect to the mass of silver contained in the exposed portion before exposure. More preferably. If the mass of silver contained in the exposed portion is 50% by mass or more based on the mass of silver contained in the exposed portion before exposure, it is preferable because high conductivity can be obtained.

  The gradation after the development processing in this embodiment is not particularly limited, but is preferably more than 4.0. When the gradation after the development processing exceeds 4.0, the conductivity of the conductive metal portion can be increased while keeping the light transmissive property of the light transmissive portion high. Examples of means for setting the gradation to 4.0 or higher include the aforementioned doping of rhodium ions and iridium ions.

[Physical development and plating]
In the present embodiment, for the purpose of improving the conductivity of the metal silver portion 62 formed by the exposure and development processing described above, physical development and / or plating treatment for supporting the conductive metal particles on the metal silver portion 62 is performed. You may go. In this embodiment, the conductive metal particles can be supported on the metal silver portion 62 by only one of physical development and plating. However, the combination of physical development and plating is used to convert the conductive metal particles into metal. It can also be carried on the silver part 62.

  “Physical development” in the present embodiment means that metal particles such as silver ions are reduced with a reducing agent on metal or metal compound nuclei to deposit metal particles. This physical phenomenon is used for instant B & W film, instant slide film, printing plate manufacturing, and the like, and the technology can be used in the present invention.

  Further, the physical development may be performed simultaneously with the development processing after exposure or separately after the development processing.

  In addition, this invention can be used in combination with the technique of the public number described below suitably. JP 2004-221564 A, JP 2004-221565 A, JP 2007-200902 A, JP 2006-352073 A, International Publication No. 2006/001461 pamphlet, JP 2007-129205 A, JP 2007-235115, JP 2007-207987, JP 2006-012935, JP 2006-0110795, JP 2006-228469, JP 2006-332459, JP 2007. JP-A-207987, JP-A-2007-226215, WO2006 / 088059, JP-A-2006-261315, JP-A-2007-072171, JP-A-2007-102200, JP-A-2006. 228473 Gazette, JP 2006-26995 A, JP 2006-267635 A, JP 2006-267627 A, WO 2006/098333 pamphlet, JP 2006-324203 A, JP 2006-228478 A. JP, 2006-228836, JP, 2006-228480, WO 2006/098336, WO 2006/098338, JP 2007-009326, JP 2006-336057, JP, 2006-339287, JP, 2006-336090, JP, 2006-336099, JP, 2007-039738, JP, 2007-039739, JP, 2007-039740, JP 2 JP 07-002296 A, JP 2007-088886 A, JP 2007-092146 A, JP 2007-162118 A, JP 2007-200902 A, JP 2007-197809 A, JP 2007-2007 A. No. 270353, No. 2007-308761, No. 2006-286410, No. 2006-283133, No. 2006-283137, No. 2006-348351, No. 2007-270321. JP, 2007-270322, WO 2006/098335 pamphlet, JP 2007-088218, JP 2007-201378, JP 2007-335729, WO 2006/098334. Pamphlet, JP 2007-134439 A, JP 2007-149760 A, JP 2007-208133 A, JP 2007-178915 A, JP 2007-334325 A, JP 2007-310091 A, JP JP 2007-31646 A, JP 2007-013130 A, JP 2006-339526 A, JP 2007-116137 A, JP 2007-088219 A, JP 2007-207883 A, JP 2007-2007 A. No. 207893, JP 2007-207910, JP 2007-013130, WO 2007/001008, JP 2005-302508, JP 2005-197234.

[Comparative Example]
Next, a first comparative example and a second comparative example of the antenna integrated heat generating film will be described below. In addition, the same code | symbol is attached | subjected to the member substantially the same as 1st Embodiment, and the overlapping description is abbreviate | omitted.

  As shown in FIG. 8, the antenna-integrated heat generating film 100 of the first comparative example includes an antenna portion 102 that occupies about a half width on the right side of the longitudinal side 12 </ b> A of the film body 12 in the drawing. And a heat generating portion 104 disposed so as to surround the lower portion of the antenna portion 102 and the left side portion in the drawing. The antenna portion 102 includes a rectangular antenna conductive layer 106 made of a metal linear portion 19.

  The heat generating portion 104 includes a heat generating conductive layer 108 in which an upper edge portion 108A is formed in a substantially L shape so as to surround the lower portion of the antenna portion 102 and the left side portion in the drawing. The heat generating conductive layer 108 has a mesh pattern 114 having intersections of a large number of lattices formed of conductive thin metal wires 22, and the first electrode 116 and the pair of opposite ends of the mesh pattern 114 are connected to the first electrode 116. A second electrode 118 is formed. The first electrode 116 and the second electrode 118 are provided along the short side portion of the film body 12, and the first electrode 116 on the left side in the drawing is longer in the longitudinal direction than the second electrode 118 on the right side in the drawing. Is long. Although not shown, a power source is connected to the first electrode 116 and the second electrode 118.

  In such an antenna-integrated heat generating film 100, the upper edge portion 108A of the heat generating conductive layer 108 is cut out in a substantially L shape so as to surround the lower portion of the antenna portion 102 and the left side portion in the drawing. The conductive amount of the left upper end portion 108B, which is a portion where the length in the longitudinal direction of the conductive layer 108 is short, becomes low (electricity does not flow easily), and the left upper end portion 108B hardly generates heat. This is because electricity tends to flow through the shortest distance between the first electrode 116 and the second electrode 118.

  As shown in FIG. 9, the antenna-integrated heat generating film 120 of the second comparative example includes an antenna portion 102 that occupies about half the width on the right side of the longitudinal side 12 </ b> A of the film body 12 in the drawing. And a heat generating portion 124 having an upper edge portion formed obliquely on the lower side of the antenna portion 102.

  The heat generating portion 124 includes a heat generating conductive layer 128 in which an upper edge portion 128A is disposed in an oblique direction in a range from the left side portion in the drawing to the lower right portion in the drawing along the longitudinal direction of the film body 12. ing. The heat generating conductive layer 128 has a mesh pattern 130 having intersections of a large number of lattices formed of conductive fine metal wires 22, and the first electrode 132 and the pair of opposite ends of the mesh pattern 130. A second electrode 134 is formed. The first electrode 132 and the second electrode 134 are provided along the short side portion of the film body 12, and the first electrode 132 on the left side in the drawing is longer in the longitudinal direction than the second electrode 134 on the right side in the drawing. Is long. Although not shown, a power source is connected to the first electrode 132 and the second electrode 134.

  In such an antenna-integrated heat generating film 120, the upper edge portion 128A of the heat generating conductive layer 128 is disposed in an oblique direction, and the lengths of the left and right first electrodes 132 and second electrodes 134 are different. The left upper end 128B, which is a portion of the layer 128 that is disposed in the oblique direction, has a low electrical conductivity (it becomes difficult for electricity to flow), and the left upper end 128B hardly generates heat. This is because electricity tends to flow through the shortest distance between the first electrode 132 and the second electrode 134.

  In contrast, in the antenna-integrated heat generating film 10 according to the first embodiment, as shown in FIG. 1, the antenna is formed below the antenna portion 14 formed along one side 12 </ b> A in the longitudinal direction of the film body 12. A belt-like heat generating portion 16 is provided along the longitudinal direction of the portion 14, and the first electrode 26 and the second electrode 28 are substantially parallel and have the same length. For this reason, the difference in the amount of conductivity due to the portion of the heat generating portion 16 is less likely to occur, and the heat generating portion 16 can generate heat almost uniformly.

[Second Embodiment]
Next, the antenna-integrated heat generating film according to the second embodiment of the present invention will be described below. In addition, the same code | symbol is attached | subjected to the member substantially the same as 1st Embodiment, and the overlapping description is abbreviate | omitted.

  As shown in FIG. 10, the antenna-integrated heat generating film 150 includes a rectangular frame portion 18A of the antenna conductive layer 18 constituting the antenna portion 14 on the surface of the film body 12, a frame portion 18A and a horizontal line portion 18B. And a region between the plurality of horizontal line portions 18B are provided with a non-conducting mesh pattern 152 having intersections of a large number of grids formed of conductive thin metal wires 154. The non-energizing mesh pattern 152 has the same configuration as the mesh pattern 24 of the heat generating portion 16 shown in FIG. 1, but no electrode is provided and electricity is not energized. That is, the non-energizing mesh pattern 152 is a dummy fine metal wire 154.

  In such an antenna-integrated heat generating film 150, a mesh pattern 152 for non-energization is provided on the outside and inside regions of the antenna conductive layer 18 constituting the antenna portion 14, so that the entire appearance of the film body 12 is meshed. It can be visually recognized as if a pattern is formed. As a result, the antiglare property is improved and the appearance of the antenna-integrated heat generating film 150 is improved as compared with the film body 12 without the non-energizing mesh pattern 152.

[Third Embodiment]
Next, the antenna-integrated heat generating film according to the third embodiment of the present invention will be described below. In addition, the same code | symbol is attached | subjected to the member substantially the same as 1st Embodiment and 2nd Embodiment, and the overlapping description is abbreviate | omitted.

  As shown in FIG. 11, the antenna-integrated heat generating film 160 includes an antenna portion 162 that occupies a predetermined width along one side 12 </ b> A in the longitudinal direction of the film body 12. The rectangular frame part 164A and the plurality of horizontal line parts 164B of the antenna conductive layer 164 constituting the antenna part 162 are formed in a mesh pattern having intersections of a large number of lattices made of conductive thin metal wires 166. The mesh pattern of the antenna conductive layer 164 has the same configuration as the mesh pattern 24 of the heat generating portion 16 shown in FIG.

  In such an antenna-integrated heat generating film 160, by forming the antenna conductive layer 164 constituting the antenna portion 162 in a mesh pattern, the metal thin wire 166 of the antenna portion 162 becomes difficult to see and the transparency is improved. Can do. Further, by forming the antenna conductive layer 164 in a mesh pattern, the antenna conductive layer 164 can be manufactured in the same pattern as the mesh pattern 24 of the heat generating part 16 shown in FIG. For this reason, it becomes easy to manufacture the antenna-integrated heat generating film 160, and cost reduction can be realized.

[Fourth Embodiment]
Next, an antenna-integrated heat generating film according to a fourth embodiment of the present invention will be described below. In addition, the same code | symbol is attached | subjected to the member substantially the same as 1st Embodiment-3rd Embodiment, and the overlapping description is abbreviate | omitted.

  As shown in FIG. 12, the antenna-integrated heat generating film 170 includes a band-shaped antenna portion 172 formed along the direction orthogonal to the longitudinal direction on the left side of the surface of the film body 12 in the drawing, and the antenna portion 172 side. And a belt-like heat generating part 174 formed along the direction.

  The antenna part 172 occupies a predetermined width along one side 12 </ b> B in a direction orthogonal to the longitudinal direction of the film body 12, and includes an antenna conductive layer 176 made of a metal linear part 19. The antenna conductive layer 176 has a plurality of vertical line portions 176B formed at substantially equal intervals along the longitudinal direction of the antenna conductive layer 176 inside the rectangular frame portion 176A. One end of the upper portion of the frame portion 176A is formed. On the side, an extending portion 176C extending to the upper edge portion of the film body 12 is provided. A power supply terminal (not shown) is connected to the end of the extended portion 176C.

  The heat generating portion 174 includes a heat generating conductive layer 178 arranged in a belt shape. The heat generating conductive layer 178 has a mesh pattern 24 having intersections of a large number of lattices formed of conductive thin metal wires 22, and the first electrode 180 and the both ends of the mesh pattern 24 in the vertical direction. The second electrode 182 is formed.

  The first electrode 180 and the second electrode 182 are formed on the edge portion along the one side 12A of the film body 12, and the first electrode 26 and the second electrode 28 are substantially parallel and have the same length. ing. The mesh pattern 24 is formed in a rectangular region between the first electrode 180 and the second electrode 182.

  In such an antenna-integrated heat generating film 170, a belt-shaped heat generating portion 174 is formed along the antenna portion 172 on the side of the antenna portion 172 formed along one side 12B in the direction orthogonal to the longitudinal direction of the film body 12. The first electrode 26 and the second electrode 28 are substantially parallel and have substantially the same length. For this reason, the difference in the amount of conductivity due to the portion of the heat generating portion 174 is less likely to occur, and the heat generating portion 174 can generate heat almost uniformly. Further, in the antenna-integrated heat generating film 170, the antenna portion 172 is provided in the vertical direction on the left side of the film body 12, so that the antenna-integrated heat generating film 170 is disposed along the edge of the front windshield of the vehicle. When pasted, it is possible to prevent the antenna unit 172 from obstructing the view of the passenger in the passenger seat.

  Hereinafter, the present invention will be described more specifically with reference to examples of the present invention. In addition, the material, usage-amount, ratio, processing content, processing procedure, etc. which are shown in the following Examples can be changed suitably unless it deviates from the meaning of this invention. Accordingly, the scope of the present invention should not be construed as being limited by the specific examples shown below. In this example, a method for producing the antenna-integrated heat generating film 160 shown in FIG. 11 will be described as an example.

<Formation of Mesh Pattern 24 and Antenna Conductive Layer 164 (Exposure / Development of Silver Salt Photosensitive Layer)>
An emulsion containing silver iodobromide grains (I = 2 mol%) having an average equivalent spherical diameter of 0.05 μm and containing 7.5 g of gelatin per 60 g of Ag (silver) in an aqueous medium was prepared. At this time, the Ag / gelatin volume ratio was 1/1, and a low molecular weight gelatin having an average molecular weight of 20,000 was used as the gelatin species.

In this emulsion, K ₃ Rh ₂ Br ₉ and K ₂ IrCl ₆ were added so as to have a concentration of 10 ⁻⁷ (mol / mol silver), and silver bromide grains were doped with Rh ions and Ir ions. . After adding Na ₂ PdCl ₄ to this emulsion and further performing gold-sulfur sensitization with chloroauric acid and sodium thiosulfate, together with the gelatin hardener, the coating amount of silver is 1 g / m ^2. It was coated on polyethylene terephthalate (PET). The PET used was hydrophilized before application. A grid-like photomask (line / space = 285 μm / 15 μm (pitch 300 μm)) capable of providing a developed silver image of line / space = 15 μm / 285 μm for forming the heat generating part 16 and the antenna part 162 on the dried coating film , A photomask having a grid-like space) and exposure using an ultraviolet lamp, development with the following developer at 25 ° C. for 45 seconds, and further fixing solution (Super Fuji Fix: manufactured by Fuji Film) After performing development processing using this, it was rinsed with pure water. The surface resistance of the completed transparent film 40 (the transparent film 40 on which the mesh pattern 24 and the antenna conductive layer 164 were formed) was 40 ohm / sq. As a result, an antenna portion 162 including the antenna conductive layer 164 was manufactured. The antenna conductive layer 164 is formed of a mesh pattern having intersections of a large number of lattices.

[Developer composition]
The following compounds are contained in 1 liter of developer.
Hydroquinone 0.037 mol / liter N-methylaminophenol 0.016 mol / liter Sodium metaborate 0.140 mol / liter Sodium hydroxide 0.360 mol / liter Sodium bromide 0.031 mol / liter Potassium metabisulfite 0.187 mol / liter

<Formation of the first electrode 26 and the second electrode 28>
A conductive copper tape (copper tape 42A) having a width of 12.5 mm and a length of 70 mm is applied to opposite ends of the mesh pattern 24 formed on the transparent film 40 so as to be approximately parallel to each other, and a pair of electrodes ( A first electrode 26 and a second electrode 28) were formed. As a result, the heat generating portion 16 including the first electrode 26 and the second electrode 28 on the short side portions on both sides of the mesh pattern 24 was produced. Further, the power source 30 is connected to the first electrode 26 and the second electrode 28 of the heat generating portion 16 (see FIG. 1), and a power supply terminal (not shown) is connected to the antenna portion 162, thereby producing the antenna integrated heat generating film 160. did.

(Evaluation)
By applying a DC voltage between the first electrode 26 and the second electrode 28 of the antenna-integrated heat generating film 160 according to Example 1, and measuring the cover surface temperature distribution after 10 minutes of energization with an infrared thermometer, the temperature distribution It was confirmed. This measurement was performed at room temperature of 20 ° C.

  As a result, in Example 1, the difference between the minimum temperature and the maximum temperature is about 5 ° C., and the temperature increase range is 13 ° C., 18 ° C. maximum, and 15.5 ° C. on average. It was found that the energy can be reduced by about 2.5 ° C. compared with the case where the temperature is raised by 18 ° C., and that is advantageous for energy saving. Further, when the temperature distribution of the heat generating portion 16 was measured, it was found that heat was generated substantially uniformly throughout the heat generating portion 16.

  In addition, the manufacturing method of the antenna-integrated heat generating film and the antenna-integrated heat generating film according to the present invention is not limited to the above-described embodiment, and various configurations can be adopted without departing from the gist of the present invention. It is.

DESCRIPTION OF SYMBOLS 10 Antenna-integrated heat generating film 12 Film body 12A One side 12B One side 14 Antenna portion 16 Heat generating portion 19 Linear portion 20 Heating conductive layer 22 Metal thin wire 24 Mesh pattern 26 First electrode (electrode)
28 Second electrode (electrode)
150 Antenna-integrated heat generating film 152 Non-energizing mesh pattern 154 Metal thin wire 160 Antenna integrated heat-generating film 162 Antenna portion 166 Metal thin wire 170 Antenna-integrated heat generating film 172 Antenna portion 174 Heat-generating portion 178 Heat-generating conductive layer 180 First electrode ( electrode)
182 Second electrode (electrode)

Claims (4)

An antenna-integrated heat generating film provided on a window glass of a vehicle,
A film body adhered to the window glass;
A band-shaped antenna portion formed along one side of the film body on the film body;
A belt-like heat generating portion formed along the antenna portion on the film body;
I have a,
The heating unit includes a mesh pattern made of fine metal wires, and the antenna unit includes a plurality of linear portions thicker than the fine metal wires,
An antenna-integrated heat generating film, which is formed of a thin metal wire and is formed with a non-energizing mesh pattern that is not energized between the plurality of linear portions and around the plurality of linear portions . The heat generating portion includes a heat generating conductive layer provided with electrodes on both ends,
The antenna-integrated heat generating film according to claim 1, wherein the electrodes are arranged in a direction intersecting with one side of the film body, and the electrodes are formed in parallel and in the same length. At least one of the heat generating part and the antenna part has a large number of continuous metal wires formed by exposing and developing a silver salt-containing layer containing silver halide,
The width of the thin metal wire is 1 μm or more and 40 μm or less,
The antenna-integrated heat generating film according to claim 1 or 2, wherein an arrangement interval of the thin metal wires is 0.1 mm or more and 50 mm or less. 4. The antenna-integrated heat generating film according to claim 1, wherein a surface resistance of the heat generating portion is 10 ohm / sq or more and 500 ohm / sq or less . 5.

Images