JP2006159091A - Dehumidification device and optical appliance - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a dehumidification device possible to be made compact and an optical appliance using the device. <P>SOLUTION: The dehumidification device 10 comprises a dehumidification film 1, an anode power supply body 2, a cathode power supply body 3, a housing 4 made of a thermoplastic resin, and a flange 5 made of a thermoplastic resin. The housing 4 is provided with male screws in the outer face for screwing in screw holes formed in the wall of an appliance which requires dehumidification to fix the dehumidification device 10. The housing 4 and the flange 5 are both made of thermoplastic organic polymers and the dehumidification device is unitedly joined by ultrasonic welding while the dehumidification film 1 is held between 4 and 5. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a dehumidifying element suitable for removing or reducing the amount of water vapor, water droplets, or other forms of water (hereinafter collectively referred to as “water”) from a space such as the atmosphere. More particularly, the present invention relates to an optical apparatus such as a dehumidifying element that performs electrochemical dehumidification and a surveillance camera for outdoor installation that includes the dehumidifying element.

  As the dehumidifying element, a solid polymer electrolyte membrane, an anode made of a gas-permeable conductor formed on one surface of the solid polymer electrolyte membrane, and the other surface of the solid polymer electrolyte membrane A dehumidifying element comprising a cathode made of a gas-permeable conductor formed so as to face the anode, and a peripheral portion of the anode so as to be electrically connected to the anode, A frame-shaped anode-side lead electrode for electrical connection with the positive electrode of the power supply, and provided in the peripheral part of the cathode so as to be electrically connected with the cathode, and electrically connected with the negative electrode of the external power supply A frame-like cathode-side extraction electrode, a first insulating outer layer film provided so as to cover the anode-side extraction electrode, and a second insulation provided so as to cover the cathode-side extraction electrode Outer layer film and the first insulating outer film And a resin layer sandwiched between the second insulating outer layer film, the dehumidifying element, the anode-side extraction electrode, the cathode-side extraction electrode, the first insulating outer layer film, and the second insulating film. A dehumidifying element module in which an insulating outer layer film is integrated by the resin layer is conventionally known from Patent Document 1 described later.

  In paragraph No. 12 of FIG. 1 and FIG. 1, as an example of the embodiment of the dehumidifying element module, a dehumidifying element module 20 in which components of the dehumidifying element are integrated with a PET film is disposed on the upper surface of the presser plate 23. A configuration is illustrated in which the set plate 21 and the set screw 22 are tightly clamped and operated by a power source 24 on the holding plate 23.

By the way, the above-mentioned conventional dehumidifying element module dehumidifying element has the following various problems. That is, as a first problem, since the dehumidifying film is integrated using four PET films, there are many parts and production processing steps, which is disadvantageous in terms of product cost and productivity. In addition, since there are a large number of parts and processing steps in production, there are also problems of quality variation and yield. As a second problem, since the dehumidifying element produced through the above steps is a dehumidifying element module using a set plate, a holding plate, and a set screw, the number of parts for modularization is again here. Many. As a third problem, set screws are used for modularization, but the outer diameter of the screw part is about 1 mm even with the smallest set screw. There is a limit to downsizing.
JP 2004-33884 A (Claim 1, FIG. 1, paragraph number 12).

  In the field of optical equipment such as surveillance cameras, particularly outdoor installation surveillance cameras, there is a problem that the inner surface of the lens is fogged due to condensation, so that the present inventors use a dehumidifying element to dehumidify the inside of the optical equipment. An attempt to install was started. However, as described above, the conventional dehumidifying element module has various problems such as cost, variation in quality, and limit of miniaturization. Since a small dehumidifying element is essential, it has been difficult to adopt.

  Therefore, in view of the above problems in the field, the present invention has an object to propose a dehumidifying element that can be miniaturized and an optical apparatus using the dehumidifying element.

  The dehumidifying element of the present invention includes a dehumidifying film having an anode for electrolyzing water and a cathode for generating water, a first dehumidifying film holding member having an opening that allows the anode to contact the dehumidified space, The first dehumidifying membrane holding member includes the second dehumidifying membrane holding member having an opening that holds the dehumidifying membrane in cooperation with the first dehumidifying membrane holding member and allows the cathode to contact the water discharge space. The attachment part attached to the apparatus which needs dehumidification was provided in either one or both of a part and said 2nd dehumidification film holding member, It is characterized by the above-mentioned.

  The optical device of the present invention is an optical device including a lens having a surface in contact with a space requiring dehumidification, wherein the anode of a dehumidifying element including an anode for electrolyzing water and a cathode for generating water is the space. It is provided so that it may touch.

The dehumidifying element of the present invention has a simple structure that is held between the first dehumidifying film holding part and the second dehumidifying film holding member provided with an element attaching part for attaching the dehumidifying element to the device. Therefore, there is no need for a set plate, a holding plate, a set screw, or the like for mounting on the device, and effects such as reduction in the number of parts, simplification of mounting, and downsizing can be obtained. In addition, the upper outer film, lower outer film, inter-anode film, inter-cathode film, etc. that were used for integral molding are no longer necessary. From this point of view, the number of parts can be reduced and the workability when manufacturing dehumidifying elements can be reduced. There are remarkable effects such as reduction in cost by improvement and the like.
Further, the optical device of the present invention can be miniaturized because the dehumidifying element used in the optical device can be miniaturized as described above, and the desired small space of the optical device can be effectively obtained. Can be dehumidified.

  In the following, parts having the same function are denoted by the same reference numerals, and description of the parts may be omitted in some subsequent drawings.

Embodiment 1 FIG.
1 to 5 illustrate Embodiment 1 of the dehumidifying element of the present invention. FIG. 1 is a perspective view of the dehumidifying element, and FIG. 2 is a schematic cross section of a dehumidifying film included in the dehumidifying element. 3 is a cross-sectional view taken along the line AA of FIG. 1, FIG. 4 is a cross-sectional view of the dehumidifying element attached to another member, and FIG. 5 is another perspective view of the dehumidifying element.

  1 to 5, the dehumidifying element 10 includes a circular dehumidifying film 1, an anode feeder 2, a cathode feeder 3, a housing 4 as an example of the first dehumidifying film holding member, and the second element. The flange 5 is included as an example of the dehumidifying film holding member.

As is well known, the dehumidifying film 1 includes an anode 11 composed of a catalyst layer 111 and a porous conductor 112, a cathode 12 composed of a catalyst layer 121 and a porous conductor 122, and the electrodes 11, 12. The anode 11 and the cathode 12 are filled with a solid polymer electrolyte. As a specific example of the dehumidifying membrane 1, a 120 mm × 120 mm titanium mesh (thickness: 150 μm) as an example of the porous conductor 112, a solid polymer electrolyte membrane (trade name: Nafion, thickness: 175 μm) manufactured by DuPont and a porous material A carbon paper (thickness: 300 μm) as an example of the conductor 122, except that a platinum catalyst layer as an example of the catalyst layer 121 is interposed between the solid polymer electrolyte membrane and the carbon paper. After forming into a thickness of 450 to 550 μm by hot pressing under the conditions of 50 ° C., 50 kgf / cm ² and holding time of 5 minutes, platinum as an example of the catalyst layer 111 was supported on the surface of the titanium mesh in a range of 106 mm × 106 mm. What applied the carbon powder catalyst and shape | molded to (phi) 8.2mm with the metal mold | die is used. In addition, as said solid polymer electrolyte membrane, the catalyst which consists of 1 type, or 2 or more types of platinum group on both surfaces may be plated or apply | coated.

  The housing 4 is configured integrally with a donut-shaped portion 41 and a cylindrical portion 42, and the cylindrical portion 42 is coupled to the outer surface of the donut-shaped portion 41, and the dehumidifying element 10 is dehumidified on the outer surface thereof. A male screw 43 is provided for screwing into a screw hole provided in a wall of a necessary device. Thus, the cylindrical portion 42 serving as the body portion of the housing 4 functions as the attachment portion for attaching the dehumidifying element 10 to a device that requires dehumidification, that is, the element attaching portion. A part of the doughnut-shaped portion 41 is provided with a feed leg through hole for inserting a feed leg 22 of the anode feeder 2 and a feed leg 32 of the cathode feeder 3 described later. The positions where the through holes are provided are not particularly limited as long as no short circuit occurs between the feeding legs 22 and 32. However, in the first embodiment and the subsequent embodiments, the positions are provided at positions 180 degrees apart from each other. It has been. The doughnut-shaped portion 41 and the cylindrical portion 42 are both graft copolymers obtained by graft copolymerization of styrene and acrylonitrile with an ethylene propylene copolymer (technopolymer AES resin, trade name: AESW 240 black is used). The housing 4 is formed by injection molding using the copolymer.

  The flange 5 has a configuration in which a donut-shaped portion 52 is integrally coupled to one end of a cylindrical portion 51, and a concentric ring-shaped concave portion 53 and radial spaces are provided on the outer surface of the donut-shaped portion 52. 4 recesses 54 are provided. The four recesses 54 are used as holes into which a screwing machine is fitted when the dehumidifying element 10 is screwed into a screw hole provided in the wall of the device that needs to be dehumidified. As with the housing 4, the flange 5 is formed by injection molding using the AESW 240 black.

  The anode power feeder 2 is composed of a circular ring-shaped power feeding portion 21 in contact with the peripheral edge of the circular dehumidifying film 1 and an elongated plate-shaped power feeding foot portion 22 extending from the power feeding portion 21. 23 is provided. Examples of the anode power supply 2 include an electrolytic corrosion-resistant metal material, for example, a platinum-plated titanium surface, and 20 pieces of titanium roll material are punched in a state of being connected in a tie-down manner by a molding die, and bending molding is performed. After that, sandblasting and platinum plating (thickness: 0.5 μm) are applied to the surface, and the product is decomposed into a single product in the cutting process. Since platinum plated titanium has poor solderability, the eyelet 23 in which brass is plated with gold is used to connect the anode 11 and the power source.

  The cathode power supply 3 has the same shape as the anode power supply 2, and includes a circular ring-shaped power supply portion 31 that contacts the peripheral edge of the circular dehumidifying film 1, and an elongated plate-shaped power supply foot portion 32 extending from the power supply portion 31. The eyelet 33 is provided in the vicinity of one end thereof. Examples of the cathode power supply 3 include a corrosion-resistant metal material such as various stainless steels, and a SUS304 roll material that has been punched and bent using a molding die is used. Since stainless steel 304 has poor solderability, eyelet 33 in which brass is plated with gold is used for connection between cathode 12 and the power source.

Next, a method for assembling the dehumidifying element 10 will be described. One of the two feed leg through holes is inserted into the feed leg 22 of the anode feeder 2 so that the feed part 21 has a donut shape of the housing 4. It installs so that the inner surface of the part 41 may be touched, and the dehumidification film | membrane 1 is installed on the said electric power feeding part 21. FIG. Next, the power feeding foot 32 of the cathode power feeder 3 is inserted into the remaining one of the two power feeding foot through holes so that the power feeding portion 31 contacts the dehumidifying film 1. Next, the doughnut-shaped packing 34 is installed on the power supply unit 31, and the flange 5 is installed on the doughnut so that the bottom surface of the cylindrical portion 51 of the flange 5 is in contact with the top surface of the packing 34. The portion where the top surface portion of 42 and the back surface of the donut-shaped portion 52 are in contact with each other is integrally formed by fusing under the condition of holding the ultrasonic wave at 40 kHz and the applied pressure of 5 kgf / cm ² for 0.2 seconds. As the packing 34, a silicon sheet having a thickness of 0.5 mm formed by a molding die is used.

  When each eyelet 23 and eyelet 33 of the power feed foot 22 and the power feed foot 32 have dimensions that cannot pass through the power feed foot through hole, the eyelets are inserted after passing through the power feed foot 22 and the power feed foot 32. Provided. In any case, the gold-plated eyelet 23 and eyelet 33 are soldered to the lead wire 8 with solder 81 as shown in FIG.

  The dehumidifying element 10 assembled in this way, together with the watertight O-ring 6, as shown in FIG. 4, an outer wall 7 a of an optical device such as a dehumidifying target device requiring dehumidification, for example, a surveillance camera 7 for outdoor installation. (The surveillance camera 7 shows only the outer wall 7a.) Insert the female screw 43 provided on the outer surface of the cylindrical portion 42 of the housing 4 into the female screw of the perforation provided in the perforated female screw provided in the housing 4 and screw it into the female screw. The anode 11 and the cathode 12 are connected to a power source (not shown) for driving the surveillance camera 7. Since the housing 4 is configured by the donut-shaped portion 41, the opening 44 is formed, and the lower surface side of the dehumidifying film 1 in FIG. 4 is in contact with the dehumidified space S 1 of the monitoring camera 7 through the opening 44. It becomes possible. On the other hand, the flange 5 is constituted by the cylindrical portion 51 and the donut-shaped portion 52 to have the opening 55, and the upper surface side of the dehumidifying film 1 in FIG. 4 is connected to the monitoring camera 7 through the opening 55. It becomes possible to contact the water discharge space S2. As a result, as will be described later in Embodiment 6, fogging due to condensation on the objective lens of the monitoring camera 7 can be prevented.

Next, the dehumidifying mechanism of the dehumidifying film 1 will be described. When a voltage is applied between the anode 11 and the cathode 12 of the dehumidifying element 10, water is electrolyzed at the anode 11 and the reaction of the following formula (1) occurs. As a result, the humidity of the dehumidified space S1 decreases.
_{2H 2 O → O 2 + 4H} + + 4e - ······ (1)
Protons (H +) generated at this time pass through the solid polymer electrolyte membrane 13, and electrons (e−) pass through an external circuit and reach the cathode 12 composed of the catalyst layer 121 and the porous conductor 122. Oxygen is consumed by the reaction (2) to generate water. The generated water is discharged into the water discharge space S2.
O ₂ + 4H ⁺ + 4e ⁻ → 2H ₂ O (2)
Further, water having an average of about 3 molecules moves from the anode 15 to the cathode 16 together with the proton (H +). Therefore, at the cathode 12, excess water moves from the anode 11 together with the water generated by the reaction of the formula (2), and the humidity of the dehumidified space S1 is lowered.

Embodiment 2. FIG.
FIG. 6 is for explaining the second embodiment of the dehumidifying element of the present invention, and is a cross-sectional view of the dehumidifying element attached to another member corresponding to FIG. 4 in the first embodiment. The second embodiment is different from the first embodiment in that the cylindrical portion 42 of the housing 4 is not provided with the male screw 43 on the outer surface, and the outer wall 7a of the monitoring camera 7 (the monitoring camera 7 is only the outer wall 7a). It is different in that it is adhered to the inner wall surface of the through hole provided in FIG. Examples of the adhesive 45 include those similar to or close to the SP value of the AES resin forming the housing 4 and the flange 5, for example, various acrylic resin adhesives.

Embodiment 3 FIG.
FIG. 7 is a perspective view of the dehumidifying element corresponding to FIG. 1 in the first embodiment for explaining the fourth embodiment of the dehumidifying element of the present invention. The fourth embodiment is different from the first embodiment in that the power supply foot portion 22 of the anode power supply body 2 and the power supply foot portion 32 of the cathode power supply body 3 both have a lead wire 8 having a plug 82 at the tip. It is different in that it is inserted and connected to the plug 82, and other points are the same.

Embodiment 4 FIG.
FIG. 8 is a perspective view of a dehumidifying element corresponding to FIG. 1 in the first embodiment for explaining the fifth embodiment of the dehumidifying element of the present invention. The fifth embodiment is different from the first embodiment in that the power feeding foot portion 22 of the anode power feeding body 2 and the power feeding foot portion 32 of the cathode power feeding body 3 each have a caulking portion 83 capable of caulking connection at the tip. The difference is that the caulking portion 83 of the lead wire 8 is caulked and the other points are the same.

Embodiment 5. FIG.
9 and 10 illustrate a sixth embodiment of the surveillance camera as an example of the optical apparatus of the present invention, and in particular, a surveillance camera for outdoor installation. FIG. 9 shows a part of the surveillance camera 7. FIG. 10 is a perspective view including a fracture portion, and FIG. 10 is a cross-sectional view taken along the line CC in FIG.

  9 and 10, the surveillance camera 7 includes a surveillance camera body 71, a housing 72 that houses the surveillance camera body 71, and a clear dome cover 73 that protects the distal end portion of the surveillance camera body 71. The monitoring camera body 71 is held in the housing 72 so that the direction of monitoring can be freely changed within a certain angle, and an objective lens 712 is installed at the tip of the tip tube portion 711, and the objective lens 712 is clear. A lens outer surface 713 exposed in the dome cover 73 and a lens inner surface 714 exposed in the distal end tube portion 711 are provided. The dehumidifying element 10 of the present invention, such as the one shown in the first to fifth embodiments, is described in the first to fifth embodiments on the outer wall 715 of the distal end cylindrical portion 711. It is installed airtight. The anode feeder 2 and the cathode feeder 3 of the surveillance camera body 71 are connected to a lead wire 8 connected to a power source (not shown) that drives the surveillance camera 7. The inside of the clear dome cover 73 communicates with the atmosphere through a plurality of vent holes 721 provided in the housing 72, and the lens outer surface 713 is in contact with the atmosphere. On the other hand, the lens inner surface 714 is in contact with the air in the surveillance camera body 71.

  The monitoring camera 7 is usually kept installed for a long period of time, during which the inner and outer surfaces 714 and 713 of the objective lens 712 may be clouded by condensed water. At this time, the lens outer surface 713 can be easily cleared by removing the clear dome cover 73 and wiping away the condensed water, but the lens inner surface 714 cannot actually be wiped off. With respect to such a problem, a space where the lens inner surface 714 is in contact, that is, a space inside the tip tube portion 711 is a dehumidified space S1, and a space where the lens outer surface 713 is in contact, ie, a space outside the tip tube portion 711 is a water discharge space S2. The dehumidifying element 10 is installed on the outer wall of the distal end cylindrical portion 711 so that the anode 11 is in contact with the dehumidified space S1 and the cathode 12 is in contact with the water discharge space S2. Thus, the inner surface 714 of the lens is always kept in a clear state when the space in the distal end cylindrical portion 711 is kept in a low humidity state.

  As mentioned above, although this invention was demonstrated in detail by Embodiment 1-Embodiment 6, this invention is not restrict | limited to those embodiments, In accordance with the subject of this invention and the spirit of the solution means. Various embodiments described below are included.

  The dehumidifying film in the present invention may be one known or known in the art, for example, those disclosed in JP-A-6-63343, JP-A-2004-33884, or other related documents.

  The first dehumidifying film holding member and the second dehumidifying film holding member in the present invention may have shapes other than the housing 4 and the flange 5, and the point is that the anode can be in contact with the dehumidified space. An element for attaching the dehumidifying element of the present invention to a device that needs to be dehumidified, having an opening that allows the opening and the cathode to contact the water discharge space, and the second dehumidifying film holding member such as the flange 5 You may have an attaching part.

  As each forming material of the first dehumidifying film holding member and the second dehumidifying film holding member, it is a structural material having a mechanical strength capable of preventing a short circuit between the anode and the cathode and constituting the dehumidifying element of the present invention. However, it is not necessary to form the whole with an electrically insulating structural material, but in general, it is more industrially produced with the dehumidifying element 10 to form the whole with various electrically insulating structural materials. Preferred from above. Examples of such electrically insulating structural materials include the following thermoplastic organic polymers, thermoset organic polymers, crosslinked or vulcanized rubbers, and inorganics.

Examples of thermoplastic organic polymers include polyolefins such as polyethylene, polypropylene, polybutene, and poly-4-methylpentene, and well-known thermoplastic resins such as polystyrene, nylon, thermoplastic polyester, and acrylic resin, and polytetrafluoroethylene. , Fluorine resins such as polychlorotrifluoroethylene, silicone resins, ethylene-vinyl acetate copolymer, acrylonitrile-styrene copolymer, acrylonitrile-butadiene copolymer, polystyrene thermoplastic Elastomers, thermoplastic elastomers such as polyolefin-based thermoplastic elastomers, polyamide-based thermoplastic elastomers, high impact polystyrene (HIPS), ABS resin, technopolymer AES resin used in Embodiment 1, etc. Graft copolymers such as graft copolymer (AES resin) obtained by graft copolymerization of styrene and acrylonitrile on ethylene propylene copolymer, engineering plastics such as liquid crystal polymer, polycarbonate, polysulfone, polyethersulfone, polyphenylene oxide, Etc. are exemplified.
Examples of thermosetting organic polymers include epoxy resins, melamine resins, phenol resins, and the like, which are reinforced with reinforcing materials such as glass fibers, ceramic fibers, metal fibers, mica, and carbon black. It may be a thing.
Examples of crosslinked or vulcanized rubber include ethylene-propylene copolymer rubber, ethylene-propylene-diene copolymer rubber, acrylonitrile-butadiene rubber, chloroprene rubber, epichlorohydrin rubber, silicon rubber, and the like. Is exemplified.
Examples of inorganic materials include glass, synthetic quartz, and ceramics.
Note that the first dehumidifying film holding member and the second dehumidifying film holding member do not necessarily need to be formed of the same material, and are different materials whose characteristics such as linear expansion coefficient, heat resistance, and deformation temperature are similar to each other. It may be.

  The connection between the first dehumidifying membrane holding member and the second dehumidifying membrane holding member may be arbitrary as long as stable airtightness is ensured. For example, the forming material of both the holding members is a thermoplastic organic polymer. In some cases, a method of welding by ultrasonic welding or the like, and in the case where the forming material is a non-heat-meltable material such as a thermosetting organic polymer or inorganic material, an adhesive, especially a water-resistant adhesive The method of adhering is exemplified. In particular, it is particularly preferable that both the first dehumidifying membrane holding member and the second dehumidifying membrane holding member are thermoplastic organic polymers because they can be easily and reliably hermetically connected by fusion such as ultrasonic welding. .

  The packing 34 may be formed of any of the various electrically insulating rubbers described above. In the first embodiment, a silicon rubber sheet having a thickness of 0.5 mm formed by a molding die is used. Has been. Examples of the O-ring 7 include those excellent in water resistance and airtightness, for example, those formed of various electrically insulating rubbers.

  Recently, the demand for surveillance cameras has been increasing rapidly due to the increase in crime for 24-hour monitoring in ATMs, shopping streets, and private houses of banks. The present invention is highly likely to be used for preventing fogging of the inner surface of the lens in such a surveillance camera.

It is a perspective view of Embodiment 1 in a dehumidification element of the present invention. 2 is a schematic cross-sectional view of a dehumidifying film included in the dehumidifying element of Embodiment 1. FIG. It is sectional drawing along the AA line of FIG. It is sectional drawing in the state which attached the dehumidification element of Embodiment 1 to the other member. FIG. 10 is another perspective view of the first embodiment. It is sectional drawing of Embodiment 2 in the dehumidification element of this invention. It is a perspective view of Embodiment 3 in the dehumidification element of this invention. It is a perspective view of Embodiment 4 in the dehumidification element of this invention. It is sectional drawing of Embodiment 6 in the surveillance camera as an example of the optical apparatus of this invention. FIG. 10 is a cross-sectional view taken along the line CC in FIG. 9.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Dehumidification element, 1 Dehumidification film | membrane, 11 Anode, 111 Catalyst layer, 112 Porous conductor, 12 Cathode, 121 Catalyst layer, 122 Porous conductor, 13 Solid polymer electrolyte membrane,
2 Anode feeder, 21 Feeder, 22 Feeder foot, 23 Eyelet, 3 Cathode feeder,
31 Feeding part, 32 Feeding foot part, 33 Eyelet, 34 Packing, 4 Housing,
41 donut-shaped part, 42 cylindrical part, 43 male thread, 44 opening part, 45 adhesive,
5 flange, 51 cylindrical portion, 52 donut-shaped portion, 53 ring-shaped recess, 54 recess, 55 opening, 6 O-ring, 7 surveillance camera, 7a outer wall, 71 surveillance camera body,
711 tip tube, 712 objective lens, 713 lens outer surface, 714 lens inner surface,
715 outer wall, 72 housing, 721 vent hole, 73 clear dome cover,
8 lead wire, 81 solder, 82 plug, 83 caulking, S1 dehumidified space,
S2 Water discharge space.

Claims (7)

  A dehumidifying membrane comprising an anode for electrolyzing water and a cathode for generating water, a first dehumidifying membrane holding member having an opening that allows the anode to contact the dehumidified space, and the first dehumidifying membrane holding member The first dehumidifying film holding part and the second dehumidifying film are provided with a second dehumidifying film holding member having an opening that cooperates to hold the dehumidifying film and allows the cathode to contact the water discharge space. A dehumidifying element characterized in that either or both of the holding members are provided with a mounting portion to be attached to a device requiring dehumidification.   2. The dehumidifying element according to claim 1, wherein the attachment portion is a body portion that can be inserted into a through hole provided in a wall of the device.   The first dehumidifying film holding member and the second dehumidifying film holding member are both formed of a thermoplastic organic polymer, and the both holding members are melted while holding the dehumidifying film between the two holding members. The dehumidifying element according to claim 1, wherein the dehumidifying element is worn.   The dehumidifying element according to any one of claims 1 to 3, wherein the device is an optical device including a lens having a surface in contact with a space in the device.   The dehumidifying element according to claim 4, wherein the optical device is a surveillance camera.   An optical apparatus having a lens having a surface in contact with a space requiring dehumidification, wherein the anode of a dehumidifying element having an anode for electrolyzing water and a cathode for generating water is provided in contact with the space. Optical equipment characterized by.   The optical apparatus according to claim 6, wherein the optical apparatus is a surveillance camera.

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