JP2017029890A - Dehumidifier and apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To avoid a problem due to housing inner pressure change, and to improve the dehumidification efficiency of a dehumidification element, as compares with a case which is not provided with means for ventilating the inside of a housing and the outside of the housing, in a dehumidifier equipped with the dehumidification element.SOLUTION: A dehumidification ventilation unit 10 attached to a housing 2 has an electrolysis dehumidification element 30 which decomposes humidity in an inner space S1 of the housing 2, and a ventilation hole 30a ventilating the inner space S1 of the housing 2 and an outer space S2 of the housing 2. The dehumidification ventilation unit 10 further has a ventilation film 40 which suppresses the entry of liquid water from the outer space S2 of the housing 2 to the inner space S1 of the housing 2 through the ventilation hole 30a.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a dehumidifying device and a device.

2. Description of the Related Art Conventionally, in an optical device such as an in-vehicle camera and a lamp such as a vehicle lamp, there has been a problem of moisture condensation in a casing that accommodates components such as an image pickup device and fogging of a lens associated therewith.
Patent Document 1 discloses a technique for attaching a dehumidifying device having a dehumidifying element for decomposing water vapor to a headlamp casing in order to prevent condensation in the headlamp casing.

Special table 2013-175538 gazette

In a dehumidifying device equipped with a dehumidifying element, if no means for venting the inside of the housing and the outside of the housing is provided, the generation of stress due to the pressure change inside the housing accompanying the temperature change of the surrounding environment, the deformation of the housing In addition to damage and damage, gas may stay on the surface of the dehumidifying element, and the dehumidifying efficiency of the dehumidifying element may be reduced.
In the dehumidifying device provided with the dehumidifying element, the present invention avoids problems associated with changes in the internal pressure of the housing as compared with the case where a means for ventilating the inside of the housing and the outside of the housing is not provided. It aims at improving dehumidification efficiency.

For this purpose, the present invention is a dehumidifying device (10, 12) attached to the housing (2), and is a dehumidifying element (30) for decomposing moisture inside the housing (2) (S1). And a dehumidifying device (10, 12) having a ventilation hole (30a) for ventilating the inside (S1) of the casing (2) and the outside (S2) of the casing (2).
Here, the suppression member (40) which suppresses that liquid water penetrate | invades into the inside (S1) of the said housing | casing (2) from the exterior (S2) of the said housing | casing (2) via the said vent hole (30a). It can be characterized by further having.
Further, the suppressing member (40) may be a gas permeable membrane that suppresses intrusion of liquid water into the inside (S1) of the casing (2), though it is ventilated.
Furthermore, the cross-sectional area of the vent hole (30a) may be smaller than the area of the dehumidifying element (30).

From another point of view, the present invention relates to an engagement portion (122) whose interior (S1) engages with the casing (2) to be dehumidified, and the interior of the casing (2) ( A dehumidifying device (10, 12) having a dehumidifying element (30) for decomposing moisture of S1) and a pressure adjusting unit (30a, 40) for adjusting the pressure inside (S1) of the housing (2). .
Here, although the said pressure adjustment part (30a, 40) ventilates, it is provided with the suppression member (40) which suppresses the penetration | invasion of the liquid water to the inside (S1) of the said housing | casing (2), The said housing | casing ( The moisture inside (S2) of 2) is decomposed by the dehumidifying element (30) and discharged to the outside (S2) of the casing (2).

Further, from another point of view, the present invention relates to a dehumidification target part (4), a case (2) having the dehumidification target part (4) inside (S1), and the case (2). In addition, the moisture inside the casing (2) (S1) is decomposed by the dehumidifying element (30), and the inside (S1) of the casing (2) and the outside (S2) of the casing (2) And a dehumidifying device (10, 12) having a function of suppressing the passage of liquid water between them and venting.
Here, the dehumidifying device (10, 12) may be further provided with a protective member (11).

  According to the present invention, in the dehumidifying device provided with the dehumidifying element, it is possible to avoid problems associated with changes in the internal pressure of the housing and to dehumidify compared to a case where no means for ventilating the inside of the housing and the outside of the housing is provided. The dehumidifying efficiency by the element can be improved.

It is the figure which showed the whole structure of the vehicle-mounted camera to which this Embodiment is applied. It is a figure for demonstrating the structure of the dehumidification ventilation unit of this Embodiment. It is a figure for demonstrating the structure of the dehumidification ventilation unit of this Embodiment. It is the figure which showed the state which is performing dehumidification operation | movement and ventilation operation | movement in a dehumidification ventilation member. (A)-(b) is a figure for demonstrating the structure of the dehumidification ventilation member of Embodiment 2. FIG. It is the figure which showed the state which is performing the dehumidification operation | movement and ventilation | gas_flowing operation | movement in the dehumidification ventilation member of Embodiment 2. FIG. (A)-(b) is a figure for demonstrating the structure of the dehumidification ventilation member of Embodiment 3. FIG. FIG. 10 is a diagram illustrating a state where a dehumidifying operation and a venting operation are performed in the dehumidifying and venting member of the third embodiment. (A)-(b) is a figure for demonstrating the structure of the dehumidification ventilation member of Embodiment 4. FIG. FIG. 10 is a diagram illustrating a state where a dehumidifying operation and a venting operation are performed in the dehumidifying and venting member of the fourth embodiment. It is a figure explaining the structure of the dehumidification ventilation member to which Embodiment 5 is applied. It is the figure which showed the state which is performing the dehumidification operation | movement and ventilation | gas_flowing operation | movement in the dehumidification ventilation member of Embodiment 5. FIG. (A)-(b) is a figure for demonstrating the structure of the dehumidification ventilation member to which Embodiment 6 is applied. FIG. 10 is a diagram showing a state where a dehumidifying operation and a venting operation are performed in the dehumidifying and venting member of the sixth embodiment. FIG. 10 is a diagram showing a state where a dehumidifying operation and a venting operation are performed in the dehumidifying and venting member of the sixth embodiment. FIG. 10 is a diagram showing a state where a dehumidifying operation and a venting operation are performed in the dehumidifying and venting member of the sixth embodiment.

<Embodiment 1>
Embodiments of the present invention will be described below in detail with reference to the accompanying drawings.
[Overall configuration of in-vehicle camera]
FIG. 1 is a diagram showing an overall configuration of an in-vehicle camera 1 to which the present embodiment is applied.
The in-vehicle camera 1 to which the present embodiment is applied is attached to a vehicle such as an automobile, and is used for imaging the rear of the vehicle, for example. Here, FIG. 1 is a cross-sectional view of the in-vehicle camera 1 that images the rear of the vehicle along the traveling direction of the vehicle, and the left side in FIG. The right side corresponds to the front of the vehicle.

A vehicle-mounted camera 1 shown in FIG. 1 includes a housing 2 that houses and protects components such as an image sensor 4 to be described later, a lens 3 that is attached to the housing 2 and collects light from the outside of the vehicle-mounted camera 1 onto the image sensor 4, It has. In the vehicle-mounted camera 1 according to the present embodiment, the housing 2 and the lens 3 constitute an internal space S1 that is closed from the external space S2 of the vehicle-mounted camera 1, and is waterproof to each component housed in the housing 2. Enhances dust resistance.
The housing 2 is formed with an opening 2a that opens from the internal space S1 of the in-vehicle camera 1 toward the external space S2. In the present embodiment, the opening 2a is configured by a cylindrical convex portion 2b that protrudes from the housing 2 toward the external space S2 side.

  The in-vehicle camera 1 is a circuit in which an image sensor 4 that is an example of a dehumidification target part that images the rear of the vehicle via the lens 3 and a circuit for controlling the image sensor 4 mounted with the image sensor 4 are formed. And a substrate 5. The image sensor 4 and the circuit board 5 are accommodated in an internal space S <b> 1 surrounded by the housing 2 and the lens 3.

Further, the in-vehicle camera 1 of the present embodiment discharges water vapor or the like in the internal space S1 of the in-vehicle camera 1 to the external space S2 to dehumidify the internal space S1, and there is a pressure difference between the internal space S1 and the external space S2. A dehumidifying ventilation unit 10 that eliminates the pressure difference by ventilation when it occurs is provided.
The dehumidifying and aeration unit 10 of the present embodiment is attached to an opening 2 a (convex portion 2 b) formed in the housing 2.

[Configuration of dehumidification ventilation unit]
Then, the dehumidification ventilation unit 10 of this Embodiment is demonstrated. FIG. 2 is a diagram for explaining the configuration of the dehumidifying and aeration unit 10 according to the present embodiment, and the dehumidifying and aeration unit 10 is cut along the thickness direction of the casing 2 and an electric component release dehumidifying element 30 described later. FIG.

  As shown in FIG. 2, the dehumidifying and aeration unit 10 of the present embodiment is an example of a dehumidifying device that is attached to the housing 2 and performs dehumidification of the internal space S1 and ventilation between the internal space S1 and the external space S2. The dehumidification ventilation member 12 is provided. The dehumidifying and aeration unit 10 includes a covering member 11 as an example of a protective member that covers the outer periphery of the dehumidifying and aeration member 12 and protects the dehumidifying and aeration member 12. In the present invention, the dehumidifying and aeration unit 10 that combines the dehumidifying and aeration member 12 and the covering member 11 may be regarded as a dehumidifying device.

  The covering member 11 includes a disk-shaped bottom surface 11a and a cylindrical side surface 11b, and has a bottomed cylindrical shape as a whole. The covering member 11 is provided with a protrusion 111 protruding from the inner peripheral surface of the side surface 11b on a mounting portion 121 described later of the dehumidifying ventilation member 12, so that a predetermined gap is formed between the covering member 11 and the dehumidifying ventilation member 12. It is attached to form. That is, the covering member 11 is provided with a plurality of protrusions 111 protruding from the inner peripheral surface of the side surface 11b with a gap in the circumferential direction of the side surface 11b. Thereby, in the part where the protrusion 111 is not provided, a path for the passage of gas and water vapor is formed between the inner peripheral surface of the side surface 11b and the dehumidifying ventilation member 12 (attachment portion 121).

[Configuration of dehumidifying ventilation member]
Then, the structure of the dehumidification ventilation member 12 of this Embodiment is demonstrated. 3A and 3B are diagrams for explaining the configuration of the dehumidifying and aeration unit 10 according to the present embodiment. FIG. 3A is a perspective view of the dehumidifying and aeration member 12, and FIG. It is sectional drawing which cut | disconnected the ventilation member 12 in the thickness direction of the housing | casing 2 and the electric component cancellation | release moisture element 30 mentioned later.

  As shown in FIGS. 3A to 3B, the dehumidifying ventilation member 12 of the present embodiment is an electrolysis as an example of a dehumidifying element that dehumidifies the internal space S1 by electrolyzing water vapor in the internal space S1. A dehumidifying element 30 is provided. Moreover, the dehumidification ventilation member 12 is provided with the ventilation film 40 as an example of the suppression member or pressure adjustment part which ventilates between internal space S1 and external space S2. Furthermore, the dehumidifying ventilation member 12 includes an attachment portion 121 that supports the electric component release moisture element 30 and the ventilation film 40 and is attached to the convex portion 2 b (see FIG. 2) of the housing 2.

As shown in FIGS. 2 and 3 (a) to 3 (b), in the dehumidifying ventilation member 12 of the present embodiment, the attachment portion 121 has a cylindrical shape in which a columnar space is formed. ing.
The attachment part 121 of this Embodiment is comprised by thermoplastic elastomer, a thermoplastic resin, etc., for example.

A method for attaching the attachment portion 121 to the convex portion 2b of the housing 2 is not particularly limited. For example, the convex portion 2b and the attachment portion 121 are threaded, and the attachment portion 121 is screwed into the convex portion 2b. A method of attaching, a method of attaching the convex portion 2b by press fitting to the attachment portion 121, or the like can be appropriately employed.
In addition, the electrical release moisture element 30 is attached to the attachment portion 121 so as to close the opening formed at one end.

[Regarding the configuration of the electric component release moisture element]
The electric component release wet element 30 of the present embodiment has a vent hole 30a for ventilating the internal space S1 and the external space S2 at the center, and has an annular shape as a whole. Although details will be described later, a ventilation film 40 is attached to the electric component release moisture element 30 so as to close the ventilation hole 30a. Thereby, in the vehicle-mounted camera 1 (refer FIG. 1) of this Embodiment, internal space S1 and external space S2 are divided | segmented by the electric component release | release moisture element 30 and the ventilation film 40. FIG.

  Moreover, in the dehumidification ventilation unit 10 (dehumidification ventilation member 12) of this Embodiment, the movement direction (air flow direction) of the gas in the ventilation hole 30a and the movement direction (dehumidification direction) of the water vapor by the electric component release moisture element 30 are parallel. It has become. In other words, in the dehumidification ventilation unit 10 (dehumidification ventilation member 12) of this Embodiment, the electric component release | release moisture element 30 is provided perpendicular | vertical with respect to the ventilation direction in the ventilation hole 30a.

  Here, in the dehumidification ventilation unit 10 (dehumidification ventilation member 12) of this Embodiment, the area of the vent hole 30a is the area of the electric component release moisture element 30 (the portion of the electric component release moisture element 30 excluding the vent hole 30a). Area). By adopting such a configuration, for example, compared with a case where the area of the vent hole 30a is larger than the area of the electric component release moisture element 30, the water vapor to the internal space S1 via the vent hole 30a and the vent film 40 can be obtained. While suppressing the inflow, it becomes possible to effectively discharge water vapor from the internal space S1 to the external space S2.

  The electrical component releasing wet element 30 of the present embodiment has an electrolyte layer 31 made of an electrolyte and one surface of the electrolyte layer 31 (a surface facing the internal space S1 side when the dehumidifying ventilation member 12 is attached to the housing 2). A first electrode layer 32 to be laminated and a second electrode layer 33 to be laminated on the other surface of the electrolyte layer 31 (a surface opposite to the one surface) are provided. Thereby, the electrolyte layer 31 is sandwiched between the first electrode layer 32 and the second electrode layer 33. In other words, the electric component release moisture element 30 of the present embodiment has a structure in which the first electrode layer 32, the electrolyte layer 31, and the second electrode layer 33 are sequentially stacked from the inner space S1 side to the outer space S2 side. doing.

The electrolyte layer 31 of the present embodiment has a film shape or a plate shape.
The electrolyte layer 31 is made of, for example, an electrolyte having proton conductivity or an electrolyte having anion conductivity. Here, a case where an electrolyte having proton conductivity is used as the electrolyte layer 31 will be described. In addition, it does not specifically limit as an electrolyte which has anion conductivity, For example, the material described in Unexamined-Japanese-Patent No. 2014-143197 etc. can be used.
Examples of the electrolyte having proton conductivity that constitutes the electrolyte layer 31 include fluoric proton conductive electrolytes such as perfluoroalkyl sulfonic acid resins, sulfonic acid groups such as polyether ketone, polyether ether ketone, and polyether sulfone. Or a polymer electrolyte material into which a proton conductive group such as a phosphate group is introduced.
The electrolyte layer 31 has a property of adsorbing moisture (water vapor) contained in the air. Further, the electrolyte layer 31 has a property of not transmitting gas.

Further, a catalyst layer (not shown) for promoting an electrolysis reaction in the electrolyte layer 31 is formed on the surface of the electrolyte layer 31 (a surface facing the first electrode layer 32 and the second electrode layer 33). Yes. Examples of the catalyst layer include simple metals of platinum group elements such as Pt, Ru, Rh, Ir, Os, and Pd, and alloys containing these platinum group elements. Among them, it is preferable to use Pt having a high catalytic activity.
In the electric component release moisture element 30 of the present embodiment, by forming a catalyst layer on the surface of the electrolyte layer 31, the electrolysis of water in the electrolyte layer 31 is more likely to proceed, and the dehumidification of the internal space S1 is performed more quickly. To be done.

  The first electrode layer 32 and the second electrode layer 33 are used for applying a predetermined voltage to the electrolyte layer 31. In the electric component release moisture element 30 of the present embodiment, the first electrode layer 32 is electrically connected to one surface of the electrolyte layer 31 facing the inner space S1 and serves as an anode. The second electrode layer 33 is electrically connected to the other surface of the electrolyte layer 31 facing the external space S2 (the surface opposite to the one surface to which the first electrode layer 32 is connected), and serves as a cathode. Work.

  The first electrode layer 32 and the second electrode layer 33 are made of a conductive material. As the first electrode layer 32 and the second electrode layer 33, for example, a mesh-like or fibrous metal material can be used. By using the first electrode layer 32 as a mesh-like or fibrous metal material, moisture (water vapor) in the internal space S1 easily passes through the first electrode layer 32 and is adsorbed on the electrolyte layer 31. In addition, by using a mesh-like or fibrous metal material for the second electrode layer 33, hydrogen, water vapor, and the like generated by a reduction reaction in the second electrode layer 33 described later pass through the second electrode layer 33. It becomes easy to be discharged to the external space S2.

Moreover, you may comprise the 1st electrode layer 32 and the 2nd electrode layer 33 with the metal plate in which the several small hole was formed. In this case, the air permeability of the first electrode layer 32 and the second electrode layer 33 is ensured by the small holes formed in the metal plate.
Furthermore, you may comprise the 1st electrode layer 32 and the 2nd electrode layer 33 with the porous material which has electroconductivity and air permeability. Examples of such a porous material include a porous carbon sheet carrying metal particles.

Moreover, in order to improve the decomposition efficiency of water vapor by the electric component release moisture element 30, it is preferable that the water vapor in the internal space S1 is effectively brought into contact with the surface of the electric component release moisture element 30.
As a method for effectively bringing water vapor into contact with the surface of the electric component release moisture element 30, for example, by forming minute protrusions or irregularities on the surface of the first electrode layer 32 of the electric component release moisture element 30, The method of generating a turbulent flow on the surface of 30 is mentioned.

[Operation of electrical release moisture element]
Next, the dehumidifying operation by the electric component release moisture element 30 will be described. In the in-vehicle camera 1 according to the present embodiment, a DC voltage is applied to the electrical release moisture element 30 by the power supply 50 at a predetermined timing. Specifically, the power source 50 continuously or intermittently between the first electrode layer 32 and the second electrode layer 33 of the electric component release moisture element 30 via the first conductor 25 and the second conductor 26. A DC voltage is applied.

Thereby, in the 1st electrode layer 32 which acts as an anode, as shown by the following reaction formula (1), the water supplied from internal space S1 is electrolyzed. That is, in the first electrode layer 32, water (H ₂ O) is electrolyzed to generate protons (hydrogen ions H ⁺ ) and oxygen (O ₂ ).
H ₂ O → 1 / 2O ₂ + 2H ⁺ + 2e ⁻ (1)
Oxygen generated in the first electrode layer 32 is released from the surface of the first electrode layer 32 into the internal space S1.
Protons (hydrogen ions) generated in the first electrode layer 32 are diffused in the electrolyte layer 31 and move to the second electrode layer 33 side.

In the second electrode layer 33 serving as the cathode, protons (hydrogen ions) supplied from the first electrode layer 32 via the electrolyte layer 31 are oxygen contained in the air as shown in the following reaction formula (2). And water vapor is generated.
1 / 2O ₂ + 2H ⁺ + 2e ⁻ → H ₂ O (2)
In the second electrode layer 33, protons (hydrogen ions) supplied from the first electrode layer 32 through the electrolyte layer 31 are directly reduced to generate hydrogen as shown in the following reaction formula (3). Sometimes it is done.
2H ⁺ + 2e ⁻ → H ₂ (3)
Then, the water vapor or hydrogen generated in the second electrode layer 33 moves in the second electrode layer 33 by diffusion and is released from the surface of the second electrode layer 33 to the external space S2.

[Configuration of the ventilation membrane]
As described above, the gas permeable membrane 40 of the present embodiment is attached on the second electrode layer 33 in the electric component release moisture element 30 so as to block the vent hole 30a formed in the electric component release moisture element 30.

  The ventilation film 40 of the present embodiment is a film that prevents liquids such as liquid water and solids such as dust from entering the internal space S1 and allows gas such as air and water vapor to circulate. The gas permeable membrane 40 can be composed of a porous membrane having a plurality of pores produced by a stretching method, an extraction method, or the like. Examples of the porous membrane used for the gas permeable membrane 40 include a polytetrafluoroethylene (PTFE) porous membrane. The PTFE porous membrane is preferable because it can maintain air permeability even in a small area and has a high ability to prevent passage of water, dust and the like.

Further, when a porous membrane is used as the gas permeable membrane 40 of the present embodiment, the average pore diameter of pores formed in the porous membrane is usually in the range of 0.01 μm to 100 μm, and 0.1 μm to 50 μm. Preferably, the range is 0.5 μm or more and 10 μm or less.
When the average pore diameter of the porous membrane used as the gas permeable membrane 40 is less than 0.01 μm, it becomes difficult for air to pass through the gas permeable membrane 40. In this case, when the air in the internal space S1 expands due to the temperature rise of the in-vehicle camera 1, the housing 2, the lens 3, and the like are easily damaged. On the other hand, when the average pore diameter of the porous membrane used as the gas permeable membrane 40 exceeds 100 μm, dust or the like easily enters the internal space S1 through the gas permeable membrane 40.

Although the thickness of the ventilation film 40 is not specifically limited, For example, it can be set as the range of 10 micrometers or more and 1000 micrometers or less.
When the thickness of the gas permeable membrane 40 is excessively thin, the strength of the gas permeable membrane 40 tends to be lowered. Moreover, when the thickness of the air permeable membrane 40 is excessively large, the dehumidifying and aeration unit 10 (dehumidification aeration member 12) is likely to be large.

Moreover, it is preferable to perform liquid repellency treatment such as water repellency treatment or oil repellency treatment on the surface of the gas permeable membrane 40. By applying a liquid repellent treatment to the gas permeable film 40, adhesion of dirt and the like to the gas permeable film 40 is suppressed. As a result, clogging of the gas permeable membrane 40 is suppressed, and a decrease in air permeability is suppressed.
The liquid repellent treatment of the gas permeable membrane 40 includes, for example, a compound containing a hydrocarbon group (perfluoroalkyl group) saturated with fluorine in the side chain and having a main chain of acrylic, methacrylic, silicone or the like as a component. This can be done by applying a liquid repellent to the surface of the gas permeable membrane 40. The method for applying the liquid repellent to the surface of the gas permeable membrane 40 is not particularly limited, and for example, gravure coating, spray coating, kiss coating, dipping, etc. can be employed.

[About dehumidification operation and ventilation operation]
By the way, conventionally, in the vehicle-mounted camera 1, condensation or cloudiness of the lens 3 may occur due to moisture in the internal space S <b> 1 (a phenomenon in which the lens 3 becomes cloudy white due to adhesion of fine water droplets). As a method of suppressing moisture in the internal space S1 of the in-vehicle camera 1, it is effective to seal the internal space S1, but since the material such as plastic constituting the housing 2 has a hygroscopic property, the internal space S1 is moved to the internal space S1. It is difficult to completely prevent moisture from entering. In such a vehicle-mounted camera 1, for example, when the outside air temperature is low or when the humidity of the internal space S1 is high, condensation or cloudiness of the lens 3 is likely to occur.

  In addition, when the internal space S1 is sealed with the housing 2 and the lens 3 in the in-vehicle camera 1, the air in the internal space S1 expands and the pressure in the internal space S1 increases rapidly, or the air in the internal space S1 contracts. If the pressure in the internal space S1 drops rapidly, the housing 2 and the lens 3 may be damaged.

Therefore, in the in-vehicle camera 1 of the present embodiment, the dehumidifying and aeration unit 10 (dehumidifying aeration member 12) discharges the water vapor that has entered the internal space S1 to the external space S2, and the pressure between the internal space S1 and the external space S2. Eliminate the difference.
Subsequently, a dehumidifying operation and a ventilation operation performed by the in-vehicle camera 1 of the present embodiment will be described. FIG. 4 is a diagram showing a state where the dehumidifying and venting member 12 is performing a dehumidifying operation and a venting operation. In FIG. 4, the solid line arrow indicates the movement of gas, and the broken line arrow indicates the movement of water vapor. Moreover, in FIG. 4, the description of the first conductor 25 and the second conductor 26 is omitted.

  In the in-vehicle camera 1 (see FIG. 1) of the present embodiment, for example, the pressure in the internal space S1 may become lower than the pressure in the external space S2 as the temperature of the internal space S1 decreases. In this case, as shown in FIG. 4, in the dehumidifying ventilation member 12, the external space S <b> 2 is connected to the internal space S <b> 1 via the ventilation hole 30 a formed in the electric component release moisture element 30 and the ventilation film 40 attached to the ventilation hole 30 a. Gas flows into the. Thereby, in the vehicle-mounted camera 1, the pressure difference between the internal space S1 and the external space S2 is eliminated.

  Here, when the humidity of the external space S2 is higher than that of the internal space S1, the humidity from the external space S2 to the internal space S1 is high via the vent hole 30a and the vent film 40 as shown in FIG. Air (water vapor) flows in.

As described above, in the dehumidifying and aeration member 12, the electric component release moisture element 30 decomposes the water vapor in the internal space S1 and discharges it to the external space S2.
Further, as described above, in the dehumidifying and aeration member 12 of the present embodiment, the vent hole 30 a and the aeration film 40 are provided in the electric component release moisture element 30. In other words, in the dehumidifying and aeration member 12 of the present embodiment, the electric component release moisture element 30 is provided adjacent to the movement path of the water vapor when the water vapor flows from the external space S2 into the internal space S1.

Thereby, in the dehumidification ventilation member 12 of this Embodiment, even if it is a case where water vapor | steam flows in into internal space S1 by the pressure difference of internal space S1 and external space S2, water vapor | steam is rapidly carried out by the electric component cancellation | release moisture element 30. And is discharged into the external space S2. More specifically, even when water vapor flows into the internal space S1, for example, before the water vapor reaches the lens 3 (see FIG. 1), the water is discharged into the external space S2 by the electric component release moisture element 30. .
For this reason, in the vehicle-mounted camera 1 of this Embodiment, it is suppressed that the water vapor | steam which flowed into internal space S1 adheres to the lens 3, and becomes a water droplet, and generation | occurrence | production of the dew condensation and cloudiness of the lens 3 is suppressed.

  On the other hand, when the pressure in the internal space S1 is higher than the pressure in the external space S2, in the dehumidifying ventilation member 12, the ventilation holes 30a and the ventilation holes formed in the electrical component releasing moisture element 30 are provided as shown in FIG. Gas flows out from the internal space S1 to the external space S2 through the gas permeable membrane 40 attached to 30a. Thereby, in the vehicle-mounted camera 1, the pressure difference between the internal space S1 and the external space S2 is eliminated.

Here, when gas flows out from the internal space S1 from the external space S2 through the vent hole 30a and the vent film 40, an air flow from the internal space S1 to the vent film 40 is generated in the internal space S1 as the gas flows out. . Further, as described above, in the dehumidifying ventilation member 12 of the present embodiment, the gas permeable membrane 40 is attached to the surface of the electric component release moisture element 30.
By having such a configuration, when gas flows out from the internal space S1 to the external space S2, water vapor existing in the internal space S1 is easily adsorbed to the electric component release moisture element 30 due to the airflow generated in the internal space S1. Thereby, in the vehicle-mounted camera 1 of this Embodiment, water vapor | steam is discharged | emitted effectively from internal space S1 to external space S2.

<Embodiment 2>
Next, a second embodiment of the present invention will be described. In the following description, the same reference numerals are used for the same configurations as in the first embodiment, and detailed description thereof is omitted here. In the following description, the description of the covering member 11 that covers the outside of the dehumidifying ventilation member 12 is omitted, but the covering member 11 may be further provided outside the dehumidifying ventilation member 12 in the following embodiments.
FIGS. 5A to 5B are views for explaining the configuration of the dehumidifying ventilation member 12 of the second embodiment. FIG. 5A is a perspective view of the dehumidifying ventilation member 12 viewed from the external space S2 side, and FIG. 5B is a perspective view of the dehumidifying ventilation member 12 viewed from the internal space S1 side. In FIGS. 5A to 5B, the description of the first conductor 25 and the second conductor 26 is omitted.

  As shown in FIGS. 5A to 5B, the dehumidifying and aeration member 12 of the present embodiment vents between the electric component release moisture element 30 that dehumidifies the internal space S1, and the internal space S1 and the external space S2. And a mounting portion 121 that supports the electrical release moisture element 30 and the ventilation membrane 40 and is attached to the convex portion 2b (see FIG. 2) of the housing 2.

  As shown in FIGS. 5A to 5B, the attachment portion 121 of the present embodiment has an engagement portion 122 that has a cylindrical shape and engages with the convex portion 2 b of the housing 2, and the engagement portion 122. And a support portion 123 that supports the electric component release moisture element 30 and the gas permeable membrane 40.

The support part 123 has a disk shape, and the electric component release moisture element 30 is provided on one surface facing the external space S2 in a state in which the dehumidifying ventilation member 12 is attached to the housing 2 (see FIG. 1). Support.
The support 123 has an element through-hole 123a through which water vapor moves toward the electrical release moisture element 30. In other words, the support portion 123 is formed with an element through-hole 123a for exposing the first electrode layer 32 of the electric component release moisture element 30 to the internal space S1 side. In the support portion 123 shown in FIG. 5B, four element through holes 123a arranged in the circumferential direction of the support portion 123 are formed.

Further, the support portion 123 is formed with a ventilation path 123b through which a gas flowing between the internal space S1 and the external space S2 passes. The ventilation path 123b has a cylindrical shape that protrudes toward the opposite side (inside the internal space S1) of the support portion 123 to the surface on which the electric component release moisture element 30 is supported. The ventilation passage 123b is formed with a cylindrical ventilation membrane through-hole 123c through which gas passes.
Here, in the support portion 123 of the present embodiment, the cross-sectional area of the ventilation film through hole 123c in the ventilation path 123b is smaller than that of the element through hole 123a.

Moreover, as shown to Fig.5 (a), the electric component cancellation | release moisture element 30 of this Embodiment has the ventilation hole 30a which ventilates in a center part, and has an annular | circular shape as a whole.
In the dehumidifying ventilation member 12 of the present embodiment, the ventilation film 40 is attached to the surface of the support portion 123 that faces the external space S2 so as to close the ventilation film through-hole 123c, and the ventilation film 40 is in communication with the ventilation film 40. The electric component release moisture element 30 is attached so that the air holes 30a overlap.

Next, a dehumidifying operation and a venting operation performed by the dehumidifying / venting member 12 of the present embodiment will be described. FIG. 6 is a diagram illustrating a state where the dehumidifying and venting operations are performed in the dehumidifying and venting member 12 according to the second embodiment, in which the dehumidifying and venting member 12 is arranged in the thickness direction of the housing 2 and the electrical component releasing moisture element 30. It is sectional drawing cut | disconnected by. In FIG. 6, a solid line arrow indicates the movement of gas, and a broken line arrow indicates the movement of water vapor. Moreover, in FIG. 6, the description of the first conducting wire 25 and the second conducting wire 26 is omitted.
As in the first embodiment, in the dehumidifying ventilation member 12, the electric component release moisture element 30 decomposes the water vapor in the internal space S1 and discharges it to the external space S2. As a result, the humidity of the internal space S1 is reduced, and the occurrence of condensation and fogging of the lens 3 (see FIG. 1) is suppressed.

  Further, when a pressure difference is generated between the internal space S1 and the external space S2 of the in-vehicle camera 1 (see FIG. 1), the ventilation film 40 and the ventilation film through-hole 123c formed in the support portion 123 are used. Thus, the gas moves between the internal space S1 and the external space S2. Thereby, also in the vehicle-mounted camera 1 to which the dehumidification ventilation member 12 of this Embodiment is applied, the pressure difference of internal space S1 and external space S2 is eliminated similarly to Embodiment 1. FIG.

  Here, in the dehumidification ventilation member 12 of this Embodiment, when the support part 123 has the ventilation path 123b, when the pressure of internal space S1 becomes low compared with the pressure of external space S2, for example, external space The gas from S2 flows into the internal space S1 through the ventilation path 123b. For this reason, in the dehumidification ventilation member 12 of this Embodiment, compared with the case where it does not have the ventilation | gas_flowing path | route 123b, the gas which flowed in from external space S2 is hard to spread | diffuse in internal space S1.

By adopting such a configuration, the dehumidifying ventilation member 12 of the present embodiment does not have the ventilation path 123b, for example, when the pressure in the internal space S1 is lower than the pressure in the external space S2. Compared to the case, water vapor is less likely to flow into the internal space S1.
Thereby, in the vehicle-mounted camera 1 to which the dehumidifying ventilation member 12 of the present embodiment is applied, an increase in humidity in the internal space S1 is suppressed and dew condensation and fogging of the lens 3 are suppressed compared to the case where this configuration is not adopted. Is done.

<Embodiment 3>
Subsequently, Embodiment 3 of the present invention will be described.
FIGS. 7A to 7B and FIG. 8 are views showing the dehumidifying ventilation member 12 of the third embodiment. Here, FIGS. 7A and 7B are views for explaining the configuration of the dehumidifying ventilation member 12 of the third embodiment, and FIG. 7A shows the dehumidifying ventilation member 12 on the external space S2 side. FIG. 7B is a perspective view of the dehumidifying ventilation member 12 as viewed from the internal space S1 side. FIG. 8 is a diagram showing a state where the dehumidifying and venting operations are performed in the dehumidifying and venting member 12 according to the third embodiment. It is sectional drawing cut | disconnected by the direction. In FIG. 8, a solid line arrow indicates the movement of gas, and a broken line arrow indicates the movement of water vapor. Further, in FIGS. 7A to 7B and FIG. 8, the description of the first conductive wire 25 and the second conductive wire 26 is omitted.

In the first embodiment and the second embodiment, one electric component releasing wet element 30 is provided, but a plurality of electric component releasing wet elements 30 may be provided. As shown in FIGS. 7A to 7B, the dehumidifying / breathing member 12 according to the third embodiment includes four electrical component releasing moisture elements 30. In addition, the dehumidification ventilation member 12 of Embodiment 3 has the structure similar to the dehumidification ventilation member 12 of Embodiment 2 except the shape of the support part 123, and the number of the electric component release moisture elements 30. FIG.
As shown in FIG. 8, water vapor is decomposed by the respective electric component release moisture elements 30, and water vapor is discharged from the internal space S1 to the external space S2.

  In the case where a plurality of electrical component release moisture elements 30 are provided as in the dehumidifying ventilation member 12 of the present embodiment, the timing for switching on / off of energization may be different for each electrical component release moisture element 30. For example, when the humidity of the internal space S1 is high, all the electric component release moisture elements 30 are energized, and when the humidity of the internal space S1 is low, any of the electric component release moisture elements 30 is turned off. Also good.

<Embodiment 4>
Next, a fourth embodiment of the present invention will be described.
FIGS. 9A and 9B are diagrams for explaining the configuration of the dehumidifying and aeration member 12 of the fourth embodiment. FIG. 9A is a perspective view of the dehumidifying ventilation member 12 viewed from the external space S2 side, and FIG. 9B is a perspective view of the dehumidifying ventilation member 12 viewed from the internal space S1 side. In FIGS. 9A to 9B, the first conductive wire 25 and the second conductive wire 26 are not shown.

The dehumidifying ventilation member 12 according to the fourth embodiment is different from the first to third embodiments in that a ventilation hole (a ventilation hole 125b described later) through which a gas flowing between the internal space S1 and the external space S2 passes, and ventilation. The positional relationship between the film 40 and the electric component release wet element 30 is different.
Specifically, as shown in FIGS. 9A to 9B, the attachment portion 121 of the fourth embodiment has a cylindrical shape and engages with the protrusion 2 b of the housing 2. And a disc-shaped support portion 125 that is provided so as to block the cylindrical space formed inside the engagement portion 122 and supports the electric component release moisture element 30.

The support portion 125 includes an element through hole 125a for moving water vapor toward the electric component release moisture element 30, a vent hole 125b for passing a gas flowing between the internal space S1 and the external space S2, have.
Here, the element through-hole 125a is provided in the central portion of the support portion 125, and the vent hole 125b is provided on the peripheral edge side of the support portion 125 as compared to the element through-hole 125a. In the present embodiment, the cross-sectional area of the vent hole 125b is smaller than that of the element through hole 125a.

  Moreover, in the dehumidification ventilation member 12 of this Embodiment, the electric component release | release moisture element 30 is attached to the surface which faces the external space S2 side in the support part 125 in the attachment part 121 so that the element through-hole 125a may be plugged up. Yes. Thereby, in the state where the dehumidification ventilation member 12 is attached to the housing 2, the first electrode layer 32 of the electric component release moisture element 30 is opposed to the internal space S1 through the element through hole 125a. .

  Further, in the dehumidifying ventilation member 12 of the present embodiment, the ventilation film 40 is attached to the end portion on the external space S2 side of the engagement portion 122 in the attachment portion 121. Specifically, the ventilation film 40 is attached so as to block the opening formed at the end of the engaging portion 122 on the external space S2 side and to face the second electrode layer 33 of the electric component release moisture element 30. ing.

  Unlike the dehumidification ventilation member 12 of Embodiment 1- Embodiment 3, the dehumidification ventilation member 12 of this Embodiment differs from the dehumidification ventilation member 12 of Embodiment 1-Embodiment 3, Is provided at a position shifted in the moving direction (venting direction) of the gas flowing between the internal space S1 and the external space S2. In addition, the dehumidifying ventilation member 12 of the present embodiment has the above-described configuration, so that the electric component release moisture element 30 is attached and the ventilation hole 125b is provided between the support portion 125 and the ventilation film 40. A space 125S (see FIG. 10 to be described later) for gas to stay is formed.

Next, a dehumidifying operation and a venting operation performed by the dehumidifying / venting member 12 of the present embodiment will be described. FIG. 10 is a diagram illustrating a state where the dehumidifying and venting operations are performed in the dehumidifying and venting member 12 according to the fourth embodiment, in which the dehumidifying and venting member 12 is arranged in the thickness direction of the casing 2 and the electric component release dehumidifying element 30. It is sectional drawing cut | disconnected by. In FIG. 10, solid line arrows indicate movement of gas, and broken line arrows indicate movement of water vapor. Moreover, in FIG. 10, the description of the first conductor 25 and the second conductor 26 is omitted.
As in the first embodiment, in the dehumidifying ventilation member 12, water vapor in the internal space S <b> 1 is decomposed by the electric component release moisture element 30. And the water vapor | steam decomposed | disassembled in the electric component cancellation | release moisture element 30 and discharged | emitted from the 2nd electrode layer 33 of the electric component cancellation | release moisture element 30 passes along the gas permeable membrane 40, and is discharged | emitted to external space S2. As a result, the humidity of the internal space S1 is reduced, and the occurrence of condensation and fogging of the lens 3 (see FIG. 1) is suppressed.

Further, when a pressure difference is generated between the internal space S1 and the external space S2, the internal space S1 and the external space S2 are interposed through the vent hole 125b formed in the vent film 40 and the support portion 125. The gas circulates.
Specifically, when the pressure in the internal space S1 is higher than the pressure in the external space S2, as shown in FIG. 10, the vent hole 125b and the vent film formed in the support portion 125 of the attachment portion 121 Via 40, the gas is discharged from the internal space S1 to the external space S2. Thereby, in the vehicle-mounted camera 1 (refer FIG. 1), the pressure difference of internal space S1 and external space S2 is eliminated.

  On the other hand, when the pressure in the internal space S1 is lower than the pressure in the external space S2, as shown in FIG. 10, the gas flows from the external space S2 to the internal space S1 through the gas permeable membrane 40 and the air holes 125b. Inflow. Here, as described above, in the dehumidifying and aeration member 12 of the present embodiment, the space 125 </ b> S is formed between the aeration film 40 and the support portion 125. Further, the cross-sectional area of the vent hole 125 b is formed smaller than the area of the electric component release moisture element 30.

  By adopting such a configuration, in the dehumidifying ventilation member 12 of the present embodiment, for example, when the humidity of the external space S2 is higher than the humidity of the internal space S1, the humidity flowing in through the ventilation film 40 is high. Air (water vapor) tends to stay in the space 125S. Thereby, in the dehumidification ventilation member 12 of this Embodiment, compared with the case where this structure is not employ | adopted, while increasing the humidity of internal space S1 does not occur easily, water vapor | steam may flow into internal space S1. It is suppressed. As a result, in the in-vehicle camera 1 of the present embodiment, an increase in the humidity of the internal space S1 is suppressed.

  In addition, although it was set as the structure which provided the ventilation film 40 which consists of a PTFE porous film etc. in the dehumidification ventilation member 12, it replaces with the ventilation film 40, for example, and may use the porous body which has the open-cell structure in which several holes were mutually connected. Good. In this case, for example, even when the covering member 11 (see FIG. 2) is not provided outside the dehumidifying ventilation member 12, the electrical component releasing moisture element 30 can be protected by the porous body.

<Embodiment 5>
Next, a fifth embodiment of the present invention will be described. FIG. 11 is a diagram for explaining the configuration of the dehumidifying ventilation member 12 to which the fifth embodiment is applied, and is a cross-sectional view of the dehumidifying ventilation member 12 cut in the thickness direction of the housing 2 and the electric component release moisture element 30. . In addition, in FIG. 11, description of the 1st conducting wire 25 and the 2nd conducting wire 26 is abbreviate | omitted.

The dehumidifying ventilation member 12 of the fifth embodiment is different from the first to fourth embodiments in the moving direction (venting direction) of the gas flowing between the internal space S1 and the external space S2, and the electric component releasing moisture element. The relationship with the moving direction (dehumidifying direction) of water vapor decomposed by 30 is different.
That is, in the dehumidification ventilation member 12 of the first to fourth embodiments, the ventilation direction between the internal space S1 and the external space S2 and the dehumidification direction by the electric component release moisture element 30 are parallel. In the dehumidifying / breathing member 12 of the fifth embodiment, the dehumidifying direction by the electrical release moisture element 30 is perpendicular to the aeration direction between the internal space S1 and the external space S2. In other words, in the dehumidifying and aeration member 12 of the fifth embodiment, the electric component release moisture element 30 is provided in parallel to the aeration direction between the internal space S1 and the external space S2.

  More specifically, as shown in FIG. 11, the dehumidifying and aeration member 12 of the fifth embodiment has a support 130 that supports the electrical component releasing moisture element 30 and the ventilation film 40. The support body 130 has a rectangular parallelepiped shape as a whole, and is attached so as to penetrate the rectangular opening 2 a formed in the housing 2.

  In addition, the support 130 has a ventilation path 131 that penetrates from the internal space S1 side to the external space S2 side. The ventilation path 131 is configured by a rectangular parallelepiped space, and has an internal opening 131a that opens toward the internal space S1 and an external opening 131b that opens toward the external space S2. Thus, the air passage 131 is connected to both the internal space S1 and the external space S2.

  Furthermore, the support body 130 has a water vapor discharge path 132 for discharging the water vapor released from the electric component release moisture element 30 to the external space S2. The water vapor discharge path 132 is configured by a rectangular parallelepiped space, and has a discharge opening 132b that opens toward the external space S2. Thereby, the water vapor discharge path 132 is connected to the external space S2. The water vapor discharge path 132 is not open to the internal space S1 side, and the end of the water vapor discharge path 132 on the internal space S1 side is closed by the support 130.

Moreover, in the dehumidification ventilation member 12 of this Embodiment, as shown in FIG. 11, the electric component release | release moisture element 30 is attached to the boundary of the ventilation path 131 and the water vapor | steam discharge path 132 in the support body 130. As shown in FIG. In other words, in the dehumidifying and aeration member 12 of the present embodiment, the ventilation path 131 and the water vapor discharge path 132 of the support 130 are separated by the electric component release moisture element 30.
More specifically, in the dehumidifying and aeration member 12 of the present embodiment, the first electrode layer 32 of the electric component release moisture element 30 faces the ventilation path 131 and the second electrode layer 33 faces the water vapor discharge path 132. As described above, the electric component release moisture element 30 is attached to the support 130.

  Furthermore, in the dehumidifying ventilation member 12 of the present embodiment, the ventilation film 40 is attached to the support 130 so as to block the external opening 131b of the ventilation path 131 and the discharge opening 132b of the water vapor discharge path 132.

  Next, a dehumidifying operation and a venting operation performed by the dehumidifying / venting member 12 of the present embodiment will be described. FIG. 12 is a diagram illustrating a state where the dehumidifying and venting operations are performed in the dehumidifying and venting member 12 according to the fifth embodiment, in which the dehumidifying and venting member 12 is arranged in the thickness direction of the casing 2 and the electric component release moisture element 30. It is sectional drawing cut | disconnected by. In FIG. 12, a solid line arrow indicates the movement of gas, and a broken line arrow indicates the movement of water vapor. Moreover, in FIG. 12, the description of the first conductor 25 and the second conductor 26 is omitted.

In the dehumidifying ventilation member 12 of the present embodiment, water vapor contained in the gas flowing into the ventilation path 131 from the internal space S <b> 1 or the external space S <b> 2 is decomposed by the electric component release moisture element 30. Then, the water vapor decomposed by the electric component release moisture element 30 and released from the second electrode layer 33 of the electric component release moisture element 30 moves through the water vapor discharge path 132, passes through the discharge opening 132 b and the gas permeable membrane 40, and is external space. It is discharged to S2.
Further, when a pressure difference occurs between the internal space S1 and the external space S2, gas flows between the internal space S1 and the external space S2 via the air passage 131 and the gas permeable membrane 40. Thereby, the pressure difference between the internal space S1 and the external space S2 is eliminated.

For example, when the pressure in the internal space S1 is higher than the pressure in the external space S2, as shown in FIG. 12, gas flows into the ventilation path 131 from the internal space S1, and the external space from the internal space S1 side. The ventilation path 131 is moved toward the S2 side (from left to right in the figure). And the gas which moved the ventilation path 131 is discharged | emitted to external space S2 via the external opening 131b and the ventilation film 40, and the pressure difference of internal space S1 and external space S2 is eliminated.
In addition, the gas that has flowed into the air passage 131 from the internal space S <b> 1 moves along the first electrode layer 32 of the electrical component releasing wet element 30 provided to face the air passage 131. For this reason, water vapor contained in the gas is adsorbed by the first electrode layer 32, decomposed by the electric component release moisture element 30, and discharged to the external space S <b> 2 through the water vapor discharge path 132 and the gas permeable membrane 40.

  By adopting such a configuration, the dehumidifying and aeration member 12 of the fifth embodiment is configured so that the internal space S1 and the external space S2 can be obtained when the pressure in the internal space S1 is higher than the pressure in the external space S2. And the water vapor in the internal space S1 can be effectively discharged to the external space S2.

On the other hand, when the pressure in the internal space S1 is lower than the pressure in the external space S2, as shown in FIG. 12, gas flows from the external space S2 into the ventilation path 131 via the ventilation film 40, The air passage is moved from the space S2 side toward the internal space S1 side (right to left in the figure). And the gas which moved the ventilation path 131 flows in into internal space S1, and the pressure difference of internal space S1 and external space S2 is eliminated.
In addition, the gas that has flowed into the ventilation path 131 from the external space S <b> 2 moves along the first electrode layer 32 of the electrical component releasing wet element 30 provided to face the ventilation path 131. As a result, water vapor contained in the gas is adsorbed by the first electrode layer 32, decomposed by the electric component release moisture element 30, and discharged to the external space S <b> 2 through the water vapor discharge path 132 and the ventilation film 40.

In the dehumidifying ventilation member 12 of the fifth embodiment, by adopting such a configuration, when the pressure in the internal space S1 becomes lower than the pressure in the external space S2, the gas from the external space S2 is It is possible to dehumidify before flowing into the internal space S1. In other words, the dried gas that has been dehumidified by the electrical release moisture element 30 flows into the internal space S1.
Thereby, for example, even when the humidity of the external space S2 is high, the flow of gas (water vapor) with high humidity into the internal space S1 is suppressed, and an increase in humidity of the internal space S1 is suppressed.

<Embodiment 6>
Subsequently, Embodiment 6 of the present invention will be described. FIGS. 13A to 13B are views for explaining the configuration of the dehumidifying ventilation member 12 to which the sixth embodiment is applied. FIG. 13A is a perspective view of the dehumidifying ventilation member 12 according to the sixth embodiment as viewed from the internal space S1 side, and FIG. 13B is a cross-sectional view taken along line XIIIB-XIIIB in FIG. In FIGS. 13A to 13B, the first conductive wire 25 and the second conductive wire 26 are not shown.
Unlike the first to fifth embodiments, the dehumidifying and aeration member 12 of the sixth embodiment is a check valve (first and later described) that is switched according to the pressure relationship between the internal space S1 and the external space S2. A check valve 161 and a second check valve 162). Further, the dehumidifying ventilation member 12 of the sixth embodiment is different from the dehumidifying ventilation member 12 of the first to fifth embodiments attached to the housing 2 from the external space S2 side, and the in-vehicle camera 1 (FIG. 1). The protrusion 2b protruding from the housing 2 to the internal space S1 side is attached to the internal space S1 side.
This will be specifically described below.

The dehumidifying / breathing member 12 of the fifth embodiment has an attachment portion 150 that supports the electric component release moisture element 30 and the ventilation film 40 and is attached to the convex portion 2 b of the housing 2.
As shown in FIGS. 13A to 13B, the mounting portion 150 of the sixth embodiment includes an engaging portion 151 that has a cylindrical shape and engages with the convex portion 2 b of the housing 2. In addition, the attachment portion 150 is connected to the end portion of the engagement portion 151 on the inner space S1 side, and protrudes from the first ventilation portion 152 toward the inner space S1 side. 30 includes a cylindrical dehumidifying part 153 that performs dehumidification by 30 and a disk-shaped second ventilation part 154 connected to an end of the dehumidifying part 153 on the inner space S1 side.

In the dehumidifying and aeration member 12 of the present embodiment, the cylindrical electric component release moisture element 30 is provided between the first ventilation portion 152 and the second ventilation portion 154 and on the inner periphery of the dehumidification portion 153. Specifically, the electric component release moisture element 30 formed so that the first electrode layer 32 is on the outer peripheral side and the second electrode layer 33 is on the inner peripheral side is provided on the inner periphery of the dehumidifying unit 153.
Further, in the dehumidifying ventilation member 12 of the present embodiment, the ventilation film 40 is provided on the surface of the first ventilation portion 152 of the attachment portion 150 on the external space S2 side.

  In the dehumidifying part 153 of the attachment part 150 of the present embodiment, an element through-hole 153 a for allowing water vapor to move toward the electric component releasing wet element 30 is formed. In this example, two through-holes 153a for elements are provided at positions facing each other with the electric component release wet element 30 in between.

  In the first ventilation part 152 in the mounting part 150 of the present embodiment, the first ventilation hole 152a through which the gas moving between the internal space S1 and the external space S2 passes, and the electric component release moisture element 30 Water vapor discharge holes 152b through which the decomposed and released water vapor is discharged are formed. Specifically, as shown in FIG. 13B, a water vapor discharge hole 152b is formed at the center of the disk-shaped first ventilation part 152, and the first ventilation part 152 is formed with respect to the water vapor discharge hole 152b. A first vent hole 152a is formed at a position shifted to the outer peripheral side. In this example, the first ventilation hole 152a is provided to be positioned vertically below the water vapor discharge hole 152b when the dehumidifying ventilation member 12 is attached to the housing 2.

  The second ventilation part 154 in the attachment part 150 of the present embodiment is formed with a second ventilation hole 154a for allowing a gas moving between the internal space S1 and the external space S2 to pass therethrough. In this example, as shown in FIG. 13B, a second vent hole 154a is formed at the center of the disc-shaped second vent portion 154.

  In addition, the dehumidifying ventilation member 12 of the present embodiment is attached to the first ventilation hole 152a in the first ventilation part 152, and is a first check valve that is switched between open and closed according to the pressure difference between the internal space S1 and the external space S2. 161. Furthermore, the dehumidifying ventilation member 12 includes a second check valve 162 that is attached to the second ventilation hole 154a in the second ventilation portion 154 and that is switched between open and closed according to the pressure difference between the internal space S1 and the external space S2. Yes.

  Next, a dehumidifying operation and a venting operation performed by the dehumidifying / venting member 12 of the present embodiment will be described. 14-16 is the figure which showed the state which is performing the dehumidification operation | movement and ventilation | gas_flowing operation | movement in the dehumidification ventilation member 12 of Embodiment 6. FIG. Here, FIG. 14 is a diagram illustrating a state in which no pressure difference is generated between the internal space S1 and the external space S2, and FIG. 15 illustrates that the pressure in the internal space S1 is lower than the pressure in the external space S2. FIG. 16 is a diagram illustrating a state in which the pressure in the internal space S1 is higher than the pressure in the external space S2. 14-16, the solid line arrow has shown the movement of gas, and the broken line arrow has shown the movement of water vapor | steam. Moreover, in FIGS. 14-16, description of the 1st conducting wire 25 and the 2nd conducting wire 26 is abbreviate | omitted.

  First, the case where the pressure difference between the internal space S1 and the external space S2 does not occur in the in-vehicle camera 1 (see FIG. 1) will be described.

In the dehumidifying ventilation member 12 of the present embodiment, when there is no pressure difference between the internal space S1 and the external space S2, the first check valve 161 is externally moved from the internal space S1 side by the urging force of the spring member 161a. It is biased toward the space S2 side (from the left side to the right side in the figure). Thereby, when there is no pressure difference between the internal space S1 and the external space S2, the first vent hole 152a is closed by the first check valve 161.
Similarly, when there is no pressure difference between the internal space S1 and the external space S2, the second check valve 162 is moved from the external space S2 side to the internal space S1 side (from the right side in the drawing) by the urging force of the spring member 162a. (Left side) Thereby, when there is no pressure difference between the internal space S <b> 1 and the external space S <b> 2, the second vent hole 154 a is closed by the second check valve 162.

Therefore, when there is no pressure difference between the internal space S1 and the external space S2, only the dehumidifying operation by the electric component release moisture element 30 is performed.
Specifically, the water vapor in the internal space S1 is adsorbed and electrolyzed by the first electrode layer 32 provided on the outer peripheral side of the electric component release moisture element 30 through the element through hole 153a of the dehumidifying part 153. And water vapor | steam is discharge | released from the 2nd electrode layer 33 provided in the inner peripheral side of the electric component cancellation | release moisture element 30. FIG.
The water vapor released from the second electrode layer 33 of the electrical release moisture element 30 is discharged to the external space S2 through the water vapor discharge hole 152b of the first ventilation part 152 and the gas permeable membrane 40.

Here, when water vapor is decomposed in the electric component release moisture element 30, the first conductive wire 25 connected to the electric component release moisture element 30 and the electric component release moisture element 30 by energization of the electric component release moisture element 30. The second conductive wire 26 (both see FIG. 3) generates heat. Thereby, in the dehumidification part 153, the rising airflow which goes upwards from the downward direction of the electric component cancellation | release moisture element 30 arises with the warmed gas.
In the dehumidifying ventilation member 12 of the present embodiment, the rising air current makes it easier for water vapor contained in the internal space S1 to enter the dehumidifying part 153 via the element through-hole 153a, and the water vapor that has entered the dehumidifying part 153. However, it becomes easy to pass the vicinity of the electric component release moisture element 30.

  As a result, even if no pressure difference is generated between the internal space S1 and the external space S2 and ventilation is not performed between the internal space S1 and the external space S2, the water vapor in the internal space S1 is removed. It is possible to effectively discharge to the external space S2.

  Subsequently, in the in-vehicle camera 1, a case where the pressure in the internal space S1 is lower than the pressure in the external space S2 will be described.

When the pressure in the internal space S1 is lower than the pressure in the external space S2, the first check valve 161 is pushed against the urging force of the spring member 161a due to the pressure difference between the internal space S1 and the external space S2. . As a result, as shown in FIG. 15, the first check valve 161 moves to the inner space S1 side (left side in the figure), and the first vent hole 152a is opened.
When the pressure in the internal space S1 is lower than the pressure in the external space S2, the second check valve 162 is kept biased by the spring member 162a and the second vent hole 154a remains closed. Maintained.

Thereby, when the pressure in the internal space S1 is lower than the pressure in the external space S2, the gas in the external space S2 enters the dehumidifying part 153 via the first vent hole 152a. As described above, when the electricity release moisture element 30 is energized, the dehumidifying unit 153 generates an upward airflow from below to above. The gas that has entered the dehumidifying part 153 from the first ventilation hole 152a by the ascending air current passes through the vicinity of the electric component release dehumidifying element 30 and passes through the element through-hole 153a provided vertically above the dehumidifying part 153 to the internal space. It flows into S1.
As a result, the pressure difference between the internal space S1 and the external space S2 is eliminated.

  Moreover, in this Embodiment, the gas which penetrate | invaded from external space S2 with the updraft produced in the dehumidification part 153 passes the vicinity of the electric component release | release moisture element 30, and the water vapor | steam contained in gas is the electric component release | release moisture element 30 of Adsorbed to the first electrode layer 32. Then, the water vapor adsorbed on the first electrode layer 32 is decomposed by the electric component release moisture element 30 and discharged to the external space S2 through the water vapor discharge hole 152b and the gas permeable membrane 40.

In the dehumidifying ventilation member 12 of the present embodiment, by adopting such a configuration, when the pressure in the internal space S1 is lower than the pressure in the external space S2, the gas from the external space S2 is transferred to the internal space. It is possible to dehumidify before flowing into S1. In other words, in the dehumidifying and aeration member 12 of the present embodiment, the gas after being dehumidified by the electric component release dehumidifying element 30 flows into the internal space S1.
Thereby, for example, even when the humidity of the external space S2 is high, the flow of gas (water vapor) with high humidity into the internal space S1 is suppressed, and an increase in humidity of the internal space S1 is suppressed.

  In addition, since the second check valve 162 is maintained in a state of being biased by the spring member 162a and the second vent hole 154a is maintained in a closed state, the second check valve 162 is maintained from the second electrode layer 33 of the electric component release moisture element 30. The discharged water vapor is discharged into the external space S2 through the water vapor discharge hole 152b without entering the internal space S1 through the second ventilation hole 154a. Thereby, in the dehumidification ventilation member 12 of this Embodiment, it becomes possible to dehumidify internal space S1 efficiently.

  Subsequently, in the in-vehicle camera 1, a case where the pressure in the internal space S1 becomes higher than the pressure in the external space S2 will be described.

When the pressure in the internal space S1 is higher than the pressure in the external space S2, the second check valve 162 is pushed against the biasing force of the spring member 162a due to the pressure difference between the internal space S1 and the external space S2. . Thereby, as shown in FIG. 16, the second check valve 162 moves to the external space S2 side (right side in the figure), and the second vent hole 154a is opened.
When the pressure in the internal space S1 is higher than the pressure in the external space S2, the state where the first check valve 161 is biased by the spring member 161a is maintained, and the first vent hole 152a remains closed. Maintained.

  Thereby, when the pressure of the internal space S1 is higher than the pressure of the external space S2, the gas in the internal space S1 is supplied to the dehumidifying element 30 provided in the dehumidifying part 153 via the second vent hole 154a. It is discharged to the inner circumference. And the gas discharged | emitted by the inner periphery of the electric component cancellation | release moisture element 30 passes the water vapor | steam discharge hole 152b and the ventilation film 40, and is discharged | emitted by the external space S2. Thereby, the pressure difference between the internal space S1 and the external space S2 is eliminated.

In addition, even when the pressure in the internal space S1 is higher than the pressure in the external space S2, the electricity release moisture element 30 is energized, and as described above, the dehumidifying unit 153 includes the electricity release moisture element 30. Ascending airflow is generated from below to above.
Thereby, even when the pressure in the internal space S1 is higher than the pressure in the external space S2, the water vapor contained in the internal space S1 easily passes through the vicinity of the electric component release moisture element 30, and the internal space S1 Water vapor can be effectively discharged to the external space S2.

As described above, in the sixth embodiment, the passage route of the gas flowing between the internal space S1 and the external space S2 is switched according to the relationship between the pressure in the internal space S1 and the pressure in the external space S2.
By adopting such a configuration, the dehumidifying and aeration member 12 of the present embodiment suppresses an increase in the humidity of the internal space S1 when a pressure difference occurs between the internal space S1 and the external space S2. However, the pressure difference between the internal space S1 and the external space S2 can be eliminated.

  In this example, the first check valve 161 and the second check valve 162 are configured to switch the gas passage route according to the relationship between the pressure in the internal space S1 and the pressure in the external space S2. The means for switching is not limited to the check valve.

As described above, according to the first to sixth embodiments, the function of dehumidifying the internal space S1 of the housing 2 and the function of adjusting the pressure in the internal space S1 (the internal space S1 and the external space S2 It is possible to realize the dehumidification ventilation unit 10 (dehumidification ventilation member 12) capable of realizing both the function of performing ventilation.
In other words, for example, by attaching the dehumidifying ventilation unit 10 of the present embodiment to a device such as the in-vehicle camera 1, clouding and condensation of the lens 3 in the in-vehicle camera 1 can be suppressed, and the internal space S 1 and the external space S 2. The damage of the housing 2 and the lens 3 due to the pressure difference between them can be suppressed.

  In addition, the function which ventilates the internal space S1 and the external space S2 of the dehumidification ventilation unit 10 (dehumidification ventilation member 12) is not limited to the form described in this Embodiment. For example, you may implement | achieve by comprising the support member itself which supports the electric component cancellation | release moisture element 30 and engages with the housing | casing 2 with the porous body which has the open-cell structure where several hole connected. In this case, ventilation between the internal space S1 and the external space S2 can be performed through the inside of the support member formed of the porous body.

  In the first to sixth embodiments, the in-vehicle camera 1 having the imaging element 4 in the housing 2 is taken as an example of a device to be dehumidified and ventilated by the dehumidifying and aeration unit 10. The applied device is not limited to the in-vehicle camera 1. In other words, the present invention is applied to devices such as a surveillance camera, a digital camera, and a vehicle lamp that have electronic components or the like inside the housing 2 and the lens 3 is likely to cause dew condensation or fogging in addition to the in-vehicle camera 1. can do.

DESCRIPTION OF SYMBOLS 1 ... Car-mounted camera, 2 ... Housing | casing, 2a ... Opening, 2b ... Convex part, 3 ... Lens, 4 ... Imaging element 5, 6 ... Circuit board, 10 ... Dehumidification ventilation unit, 11 ... Case, 12 ... Dehumidification ventilation member 25 ... 1st conductor, 26 ... 2nd conductor, 30 ... Electric component cancellation | release moisture element, 40 ... Breathable film, S1 ... Internal space, S2 ... External space

Claims (8)

A dehumidifying device attached to a housing,
A dehumidifying element that decomposes moisture inside the housing;
A dehumidifying device having a ventilation hole for ventilating the inside of the housing and the outside of the housing.   The dehumidifying device according to claim 1, further comprising a suppression member that suppresses liquid water from entering the inside of the casing from the outside of the casing through the vent hole.   The dehumidifying device according to claim 2, wherein the suppressing member is a ventilation film that vents but prevents liquid water from entering the inside of the casing.   The dehumidifying device according to any one of claims 1 to 3, wherein a cross-sectional area of the vent hole is smaller than an area of the dehumidifying element. An engaging portion that engages with a casing whose inside is to be dehumidified;
A dehumidifying element that decomposes moisture inside the housing;
A dehumidifying device having a pressure adjusting unit that adjusts the pressure inside the housing. The pressure adjusting unit includes a suppressing member that vents but suppresses intrusion of liquid water into the housing.
The dehumidifying device according to claim 5, wherein moisture inside the housing is decomposed by the dehumidifying element and discharged to the outside of the housing. A dehumidifying part,
A housing having the dehumidifying target portion therein;
A function that engages with the housing and decomposes moisture inside the housing with a dehumidifying element, and suppresses the passage of liquid water between the inside of the housing and the outside of the housing but performs ventilation. And a dehumidifying device comprising:   The device according to claim 7, further comprising a protective member for protecting the dehumidifying device.

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