Moisture-proof device configured to be mounted on a closed housing

Abstract

A moisture-proofing device is provided that is configured to be mounted on a closed housing. [Solution] A moisture-proof device configured to be attached to a closed housing. The moisture-proof device 1 comprises at least one casing 2 and a desiccant, the casing 2 having walls defining a chamber, the casing 2 being attached to the closed housing such that a first part 4 of the casing 2 is located within the sealed space and a second part 5 of the casing 2 is located outside the closed housing, the desiccant is contained within the chamber, the first part 4 includes a communication port between the chamber and the sealed space, and the second part 5 includes an exhaust port 8 which is closed by a valve 9, the valve 9 being configured to allow the desiccant to flow out of the chamber through the exhaust port 8 when the desiccant exerts a pressure on the valve 9 above a predetermined pressure.

Description

[[Technical Field]]

[0001] The present disclosure relates to a moisture-proof device configured to be attached to a closed housing. This device is particularly suitable for use in removing moisture from a vehicle headlamp housing. [[Background Art]]

[0002] In many fields of activity, it is necessary to arrange items of equipment in a closed housing for various reasons. For example, a closed housing can be used to protect the device from external threats. However, closed housings are prone to generating moisture inside, especially in outdoor applications, which may adversely affect the devices accommodated in the housing.

[0003] For example, a vehicle headlamp includes a closed housing containing glass (or transparent plastic) and a light source within the closed housing. Generally, the closed housing is made of plastic. Moisture can diffuse through plastic. The plastic of the headlamp housing absorbs ambient moisture and diffuses it inside. This allows moisture to enter the interior of the headlamp housing. This moisture can be dangerous for the electrical components of the headlight. The moisture may also condense on the lens or glass of the headlamp. This condensation can affect the illumination of the headlight and reduce the efficiency of the headlight.

[0004] One solution is to use a device that removes moisture from the headlight. Such devices generally include a desiccant that adsorbs moisture from the air. The desiccant is often placed in a sachet and installed in the casing of the device. When the desiccant adsorbs moisture from the air, the volume of the desiccant increases. When the desiccant reaches a volume exceeding the capacity of the casing containing it, the casing may rupture, causing the desiccant to spill into the headlight housing.

[0005] Similar problems can occur with camera devices that can be mounted on the windshield inside the passenger compartment to observe the scene in front of the vehicle, particularly camera devices for autonomous vehicles. Such camera devices consist of a housing in which a camera or other vision instruments are installed. Mist may be generated inside the housing due to the temperature difference between the inside and outside of the passenger compartment, and this mist may interfere with or render the vehicle inoperable in autonomous driving mode. [Overview of the initiative]

[0006] One object of this disclosure is to overcome, at least partially, the shortcomings of the prior art by providing an improved moisture-proof device.

[0007] According to the present invention, the moisture-proofing device comprises at least, A casing having walls that define the chamber and configured to be attached to a closed housing, A desiccant contained within a chamber and configured to absorb moisture, A first component of the casing includes a communication opening configured to allow gasous communication between the chamber and a sealed space when the moisture-proof device is installed in a closed housing, wherein the communication opening is configured to allow moisture formed in the sealed space to pass into the chamber so that the desiccant can take in the moisture, A second component of the casing includes at least one exhaust port closed by a valve, the valve configured to allow the moisture-absorbing desiccant to flow out of the chamber through the exhaust port when the moisture-absorbing desiccant exerts a pressure on the valve above a predetermined pressure, Includes.

[0008] Therefore, as a result of the valve, when the moisture-absorbing desiccant reaches a predetermined amount in the chamber, it can be released through the valve, preventing the casing from bursting and allowing the desiccant to enter the closed housing.

[0009] A moisture-proof device may have one or more of the following characteristics, either individually or in combination:

[0010] For example, the valve is an umbrella valve, which includes a rod and a dome-shaped head having a base, a second component of the casing including a bore penetrating the wall of the casing, the rod including a shoulder that holds the head at the height of the base of the dome in contact with the at least one exhaust port, and the head completely closes the at least one exhaust port as long as the pressure exerted on the head by the moisture-absorbing desiccant is below a predetermined pressure.

[0011] Furthermore, the moisture-proof device includes at least two, preferably four, exhaust ports, specifically in the form of arcs, the exhaust ports being arranged to at least partially surround the bore.

[0012] Furthermore, the at least one exhaust port is positioned, for example, at the top of the second component of the casing when the moisture-proof device is installed.

[0013] The moisture-proof device includes a pressure balancing channel isolated from the chamber between the outside of the closed housing and the sealed space, the pressure balancing channel having a first orifice opening to the outside of the closed housing and a second orifice configured to open to the sealed space of the closed housing when installed.

[0014] For example, the ratio of the diameter to the length of the pressure equilibrium channel is 0.5 or less, specifically 0.4 or less, and more specifically 0.1 or less, in order to prevent water splashes or external moisture from diffusing into the sealed space.

[0015] Alternatively, the moisture-proof device may include a removable operculum configured to close the communication opening when the moisture-proof device is not attached to the enclosed housing.

[0016] Advantageously, the moisture-proof device includes, specifically, a mounting ring surrounding the casing between a first part of the casing and a second part of the casing, and the moisture-proof device includes a mounting interface configured to surround the opening of the closed housing, and the mounting ring is configured to mount the moisture-proof device to the mounting interface.

[0017] Specifically, the mounting ring and mounting interface form a bayonet attachment system.

[0018] According to one embodiment, a first part of the casing and a second part of the casing each have walls in the form of a straight cylinder with a first end closed and a second end open, the first part and the second part are assembled together at their respective second ends, the second end of the cylinder of the second part of the casing includes a cylindrical shoulder, and the second end of the first part abuts against the cylindrical shoulder.

[0019] Furthermore, the mounting ring extends the second part of the casing around the cylindrical shoulder, surrounding the second end of the first part of the casing, and the moisture-proof device includes a circular sealing gasket between the mounting ring and the second end of the first part of the casing, the sealing gasket (19) being configured to provide a sealed mounting between the moisture-proof device and the closed housing.

[0020] In another arbitrary embodiment, a first orifice of the pressure equilibrium channel opens to the outside of the closed housing through a cylindrical shoulder, and a second orifice of the pressure equilibrium channel opens into a diffusion chamber that is in gas communication with the sealed space of the closed housing, the diffusion chamber being a recess formed in a first part of the casing, and the pressure equilibrium channel extending between the first and second orifices within the thickness of the straight cylindrical wall of the first part of the casing.

[0021] Furthermore, the diffusion chamber may be separated from the sealed space by a first membrane configured to allow air to pass between the diffusion chamber and the sealed space and prevent moisture from passing from the exterior of the closed housing toward the sealed space.

[0022] Furthermore, the communication port of the first component of the casing includes a second membrane configured to allow moisture contained in the sealed space to pass toward the chamber, for example.

[0023] The present invention also relates to a vehicle headlamp including at least one closed housing that accommodates a light source in a sealed space.

[0024] According to the present invention, the vehicle headlamp includes the moisture-proof device defined above, and the moisture-proof device is installed in an opening of the closed housing such that the first component of the casing is located inside the sealed space and the second component of the casing is located outside the closed housing.

[0025] The present invention also relates to an image pickup device including at least one closed housing that accommodates a camera in a sealed space.

[0026] According to the present invention, the image pickup device includes the moisture-proof device defined above, and the moisture-proof device is installed in an opening of the closed housing such that the first component of the casing is located inside the sealed space and the second component of the casing is located outside the closed housing.

[0027] Upon reading the description provided below with reference to the accompanying drawings, the present disclosure, exemplified herein, as well as the features and advantages thereof, will become more apparent. Brief Description of the Drawings

[0028] [Figure 1] It is a perspective view of the moisture-proof device. [Figure 2A] It is a longitudinal sectional view of the moisture-proof device containing a desiccant in a new state before being exposed to moisture. [Figure 2B]This is a longitudinal cross-sectional view of a moisture-proof device containing a moisture-containing gel-like desiccant after exposure to moisture. [Figure 3] This is an enlarged perspective view of a bore configured to receive an exhaust port and a valve. [Figure 4] This is a magnified perspective view of the exhaust port and valve. [Figure 5] This is an enlarged perspective view of the exhaust port and the valve that allows the desiccant to pass through and be discharged from the chamber. [Figure 6] This is a perspective view of a moisture-proof device equipped with a removable cover that closes the communication opening. [Figure 7] This is a perspective view of the moisture-proof device with the removable cover removed from the communication port. [Figure 8] This is a schematic perspective view of a closed housing with a moisture-proof device installed, specifically a vehicle headlight. [Figure 9] This figure shows a moisture-proof device and a mounting interface configured to surround the opening of the enclosed housing for attaching the moisture-proof device to the enclosed housing using mounting rings. [Modes for carrying out the invention]

[0029] The results are examples only. While this specification refers to one or more embodiments, this does not necessarily mean that each reference relates to the same embodiment. Other embodiments may also be provided by combining or substituting simple features of different embodiments without departing from the scope of the invention as defined by the claims.

[0030] The following explanation will be based on the diagrams above. In these diagrams, identical elements have the same reference number.

[0031] In this specification, the adjectives “top” and “low” are defined according to gravity. The adjective “low” describes the direction in which an object is pulled by gravity, and the adjective “top” describes the opposite direction.

[0032] The present invention relates to a moisture-proof device 1 configured to be attached to a closed housing 13 that defines a sealed space 14, as shown in Figures 1 and 2A. The moisture-proof device 1 is suitable for dehumidification, that is, for removing moisture from or preventing the appearance of moisture within any of the closed housings 13.

[0033] The moisture-proof device 1 is particularly suitable for implementation in a vehicle headlamp 29, as shown in the specific embodiment in Figure 8.

[0034] Similarly, although not explicitly stated, the moisture-proof device 1 is also adapted to be implemented in an imaging device that includes, in particular, at least one closed housing that houses a camera or optical detection sensor within a sealed space.

[0035] The moisture-proof device 1 includes at least one casing 2 having walls that define a chamber 3, and a desiccant 6 contained within the chamber 3.

[0036] The casing 2 is configured to be attached to the closed housing 13. The desiccant 6 is configured to adsorb moisture.

[0037] For example, the desiccant 6 is a mixture of magnesium chloride and carboxymethylcellulose (CMC) gelled powder.

[0038] As shown in Figure 2A, the chamber 3 of the casing 2 contains the desiccant 6 in bulk, not in one or more small bags.

[0039] The first component 4 of the casing 2 includes a communication port 7, which is configured to allow the chamber 3 to communicate with the sealed space 14 when the moisture-proof device 1 is attached to the closed housing 13. The communication port 7 is configured to allow moisture formed in the sealed space 14 to pass into the chamber 3 so that the desiccant 6 can take in moisture.

[0040] In this specification, the phrase "when the moisture-proof device is attached to the closed housing" is equivalent to the phrase "in the state in which the moisture-proof device is installed."

[0041] A second component 5 of the casing 2 includes at least one exhaust port 8 which is closed by a valve 9. The valve 9 is configured to allow the moisture-absorbing desiccant 6 to flow out of the chamber 3 through the exhaust port 8 when the moisture-absorbing desiccant 6 exerts a pressure on the valve 9 that exceeds a predetermined pressure.

[0042] In embodiments shown in Figures 1, 2A, and 2B, the valve 9 corresponds to an umbrella valve. As shown in Figures 2A, 2B, and 4, the umbrella valve includes a rod 23 and a dome-shaped head 24 with a base 25. As shown in Figure 3, a second component 5 of the casing 2 includes a bore 26 that penetrates the wall of the casing 2. As shown in Figures 4, 2A, and 2B, the rod 23 includes a shoulder 27 that holds the head 24 in contact with the at least one exhaust port 8 and at the height of the base 25 of the dome. The head 24 completely closes the at least one exhaust port 8 as long as the pressure exerted on the head 24 by the moisture-absorbing desiccant 6 is below a predetermined pressure. If the moisture-absorbing desiccant 6 exerts a pressure on the head 24 that exceeds the predetermined pressure, the head 24 deforms, allowing the moisture-absorbing desiccant 6 to flow out of the chamber 3 through the exhaust port 8 (Figure 5). The head may be made of silicone, which is easily deformable when the pressure applied to the head exceeds a predetermined pressure.

[0043] As can be seen in Figure 3, the moisture-proof device may include at least two, preferably four, exhaust ports 8. Each exhaust port 8 may be arranged in an arc shape. The exhaust ports 8 may be arranged to at least partially surround the bore 26 (Figure 3).

[0044] In a preferred embodiment, the at least one exhaust port 8 is positioned at the top of the second component 5 of the casing 2, as shown in Figures 1, 2A, 2B, and 9, when the moisture-proof device 1 is installed. Specifically, this top portion is the part located above the axis A (see Figure 2A) that passes through the moisture-proof device 1 and defines the center relative to the communication port 7.

[0045] In this embodiment of Figure 2A, the desiccant 6 has not yet absorbed any moisture and is located at the bottom of the chamber 3. Therefore, the filling level of the desiccant 6 is at the bottom of the chamber 3. Consequently, the filling level of the desiccant 6 has not reached the height of at least one exhaust port 8. As the desiccant 6 absorbs moisture, it gradually occupies more and more space within the chamber 3. The filling level rises towards the top of the chamber 3 until it reaches at least one exhaust port 8, as shown in Figure 2B. As soon as the desiccant 6 reaches at least one exhaust port 8 (Figure 2B), it can exert pressure on the valve 9. When the moisture-absorbing desiccant 6 exerts a pressure on the valve 9 that exceeds a predetermined pressure, the valve 9 releases the desiccant 6 from the chamber 3 through at least one exhaust port 8.

[0046] As a non-limiting example, the height of at least one exhaust port 8 and a predetermined pressure are selected such that the volume of the moisture-absorbing desiccant 6 reaches 90% of the volume of the chamber 3.

[0047] Advantageously, the moisture-proof device 1 includes a pressure-equalizing channel 10 isolated from the chamber 3 between the outside of the closed housing 13 and the sealed space 14. The pressure-equalizing channel 10 has a first orifice 11 that opens to the outside of the closed housing 13 when the moisture-proof device 1 is installed, and a second orifice 12 configured to open into the sealed space 14 of the closed housing 13. The pressure-equalizing channel 10 can circulate air between the outside of the closed housing 13 and the sealed space 14. By isolating the pressure-equalizing channel 10 from the chamber 3, the operating time of the desiccant 6 can be extended by preventing moisture that may be present in the air passing through the pressure-equalizing channel 10 (equalizing the pressure between the outside of the closed housing 13 and the sealed space 14) from being absorbed by the desiccant 6.

[0048] The pressure equilibrium channel 10 has a diameter and length (of the cross-section of the channel) that depend on the following equation, which follows Fick's laws at a constant temperature: JPEG2026143348000002.jpg13150 Here, - F is the flow of moisture (water vapor) circulating within the pressure equilibrium channel 10. - D is the diffusion coefficient of moisture in the air (unit: m 3 It supports / s. - d corresponds to the diameter of the pressure equilibrium channel 10 (in mm), - l is the length of the pressure equilibrium channel 10 (in mm), - P ext This corresponds to the partial pressure (in kPa) of moisture outside the enclosed housing 13. - P int This corresponds to the partial pressure of moisture (unit: kPa) inside chamber 3.

[0049] Therefore, the diameter d and length l are determined to minimize the flow of moisture F.

[0050] In a non-limiting embodiment, the ratio of the diameter to the length of the pressure equilibrium channel 10 is 0.5 or less, specifically 0.4 or less, and more specifically 0.1 or less, in order to prevent external moisture from entering the sealed space 14 by splashing or diffusion.

[0051] As a non-limiting example, the diameter of the pressure equilibrium channel 10 is 1 mm (at least 0.8 mm) and its length is 15 mm (at least 2 mm).

[0052] Thus, the pressure equilibrium channel 10 allows for a sufficiently large exchange of air to maintain pressure equilibrium, but this exchange of air is small enough not to be a significant source of external moisture diffusion into the sealed casing 13.

[0053] According to the embodiments shown in Figures 6 and 7, the moisture-proof device 1 includes a removable lid 16 configured to seal the communication opening 7 when the moisture-proof device 1 is not installed in the closing casing 13. This removable lid 16 prevents the desiccant from absorbing moisture before installation in the closing housing 13. Normally, the moisture-proof device is sealed in a waterproof bag when not installed in the closing housing 13 to prevent the desiccant from absorbing moisture. The use of a removable lid 16 eliminates the need for a plastic bag. The removable lid 16 can also be reused in other moisture-proof devices 1. For example, the removable lid 16 can be removed to fit a headlamp and then returned to the manufacturer for reuse.

[0054] In one embodiment, the device includes a mounting ring 17 that surrounds the casing 2 between a first component 4 of the casing 2 and a second component 5 of the casing 2. The moisture-proof device 1 includes a mounting interface 28 (see Figure 9) configured to surround an opening 15 within the closed housing 13. Thus, the mounting ring 17 is configured to attach the moisture-proof device 1 to the mounting interface 28.

[0055] As a non-limiting example, the mounting ring 17 and mounting interface 28 form a bayonet mounting system. In Figure 9, a second component 5 of the casing 2 includes lugs 31a configured to engage with a notch 31b. When the casing 2 is rotated around its longitudinal axis A, the lugs 31a are held by a portion 31c of the mounting interface 28. To facilitate the rotation of the casing, the moisture-proof device 1 may include gripping elements 32 that allow the casing to be held and rotated around the longitudinal axis after the lugs 31a have passed the notch 31b. The gripping elements 32 may be located on the mounting ring 17.

[0056] Furthermore, the moisture-proof device 1 may also include locking elements 33a, 33b, 33c, and 33d. The locking elements 33a, 33b, 33c, and 33d are configured to prevent unintended rotation of the casing 2 when the casing 2 is attached to the mounting interface 28. For example, the mounting ring 17 may include first locking elements 33a, 33c configured to engage with second locking elements 33b, and 33d when the lug 31a is held by the portion 31c of the mounting interface 28.

[0057] As shown in Figure 9, the locking element 33b includes a safety lug 330 that protrudes vertically from the mounting interface 28. The locking element 33a, configured to engage with the locking element 33b, includes cat-ear shaped projections 331, 332 that protrude radially from the mounting ring 17. When lug 31a engages with the notch 31b, the safety lug 330 is positioned on the projection between the two cat ears 331, 332. When the casing 2 rotates, the safety lug 330 moves onto the cat ears 331 and is no longer positioned on the projection. If someone attempts to remove the casing 2 by rotating it, the safety lug 330 will strike and break against the cat ears 331. Therefore, if the safety lug 330 is broken, it can be assumed that the casing 2 has been removed from the mounting interface 28 at least once.

[0058] The locking elements 33c and 33d prevent the casing 2 from rotating when it is attached to the mounting interface 28.

[0059] In one embodiment, the first part 4 and the second part 5 of the casing 2 each have walls in the form of straight cylinders P1 and P2, with first ends E14 and E15 closed and second ends E24 and E25 open (Figures 2A and 2B). The first part 4 and the second part 5 are assembled together at their respective second ends E24 and E25. The second end E25 of the cylinder of the second part 5 of the casing 2 may include a cylindrical shoulder 18. The second end E24 of the first part 4 can abut against the cylindrical shoulder 18. The longitudinal axis A can correspond to the axis of rotation of the straight cylindrical walls P1 and P2.

[0060] In one embodiment, the mounting ring 17 extends the second part 5 of the casing 2 around the cylindrical shoulder 18 to surround the second end E24 of the first part 4 of the casing 2. Advantageously, the moisture-proof device 1 includes a circular sealing gasket 19 between the mounting ring 17 and the second end E24 of the first part 4 of the casing 2. The sealing gasket 19 is configured to provide a sealed fit between the moisture-proof device 1 and the closing housing 13.

[0061] According to one embodiment, the first orifice 11 of the pressure equilibrium channel 10 opens to the outside of the closed housing 13 through a cylindrical shoulder 18. The second orifice 12 of the pressure equilibrium channel 10 opens into a diffusion chamber 20 that is in gas communication with the sealed space 14 of the closed housing 13. The diffusion chamber 20 can be a recess in the first part 4 of the casing 2. In Figures 2A and 2B, the diffusion chamber 20 corresponds to a recess in the straight cylindrical wall P1 of the first part 4 of the casing 2. Advantageously, the pressure equilibrium channel 10 extends between the first orifice 11 and the second orifice 12 within the wall thickness of the straight cylinder P1 of the first part 4 of the casing 2.

[0062] The diffusion chamber 20 can be separated from the sealed space 14 by a first membrane 21 configured to allow air to pass between the diffusion chamber 20 and the sealed space 14, preventing moisture from passing from the outside of the closed housing 13 into the sealed space 14.

[0063] For example, the first membrane 21 is formed from a non-woven polyethylene fiber fabric.

[0064] Similarly, the communication port 7 of the first component 4 of the casing 2 may include a second membrane 22 configured to allow moisture contained in the sealed space 14 to pass towards the chamber 3 and to prevent the desiccant, which has absorbed moisture and deformed into a gel, from spilling into the sealed space 14.

[0065] As a non-limiting example, the second membrane 22 is formed from woven polyvinyl chloride.

[0066] The present invention also relates to a vehicle headlamp 29 including at least one closed housing 13 that houses a light source 30 within a sealed space 14 (Figure 8). For example, the closed housing 13 may include walls 44 and windows 45 configured to face the outside of the vehicle. The vehicle headlamp 29 includes the moisture-proof device 1 described above. The moisture-proof device 1 is installed within the opening 15 of the closed housing 13 such that a first component 4 of the casing 2 is located within the sealed space 14 and a second component 5 of the casing 2 is located outside the closed housing 13. [Explanation of symbols]

[0067] 1. Moisture-proof device 2 Casing 4. First part of the casing 5. Second part of the casing 8 exhaust vents 9 valves 11. First Orifice 17 Mounting ring 18 Cylindrical Shoulder Bag 21 The first membrane 32 Gripping element

Claims

1. A moisture-proof device (1) configured to be attached to a closed housing (13) that defines a sealed space (14), wherein at least, A casing (2) having a wall that defines the chamber (3) and configured to be attached to the closed housing (13), A desiccant (6) is housed in the chamber (3) and configured to adsorb moisture, The first component (4) of the casing (2) includes a communication port (7) configured such that when the moisture-proof device (1) is attached to the closed housing (13), the chamber (3) is in gas communication with the sealed space (14), and the communication port (7) is configured to allow moisture formed in the sealed space (14) to pass into the chamber (3) so that the desiccant (6) can take in the moisture, A second component (5) of the casing (2) includes at least one exhaust port (8) closed by a valve (9), wherein the valve (9) is configured to allow the moisture-absorbing desiccant (6) to flow out of the chamber (3) through the exhaust port (8) when the moisture-absorbing desiccant (6) exerts a pressure on the valve (9) of a predetermined pressure or higher, A device characterized by being equipped with the following features.

2. The valve (9) corresponds to an umbrella valve, the umbrella valve includes a rod (23) and a dome-shaped head (24) having a base (25), the second part of the casing includes a bore (26) penetrating the wall of the casing (2), the rod (23) includes a shoulder (27) that brings the head (24) into contact with the at least one exhaust port (8) and holds it at the height of the base (25) of the dome, The head (24) completely closes the at least one exhaust port (8) as long as the pressure exerted on the head (24) by the desiccant that has absorbed moisture is less than a predetermined pressure. The apparatus according to feature 1.

3. It comprises at least two, preferably four, specifically arc-shaped exhaust ports (8), the exhaust ports (8) being arranged to at least partially surround the bore (26), The apparatus according to feature 2.

4. The at least one exhaust port (8) is positioned at the top of the second component (5) of the casing (2) when the moisture-proof device (1) is installed. The apparatus according to any one of claims 1 to 3.

5. A pressure balancing channel (10) is provided between the outside of the closed housing (13) and the sealed space (14), the pressure balancing channel (10) having a first orifice (11) opening to the outside of the closed housing (13) and a second orifice (12) configured to open to the sealed space (14) of the closed housing (13) in the installed state. The apparatus according to any one of claims 1 to 4.

6. The ratio of the diameter to the length of the pressure equilibrium channel (10) is 0.5 or less in order to prevent water splashes or external moisture from diffusing into the sealed space (14). The apparatus according to feature 5.

7. The moisture-proof device (1) is provided with a mounting ring (17) surrounding the casing (2) between the first component (4) and the second component (5) of the casing (2), and the moisture-proof device (1) is provided with a mounting interface (28) configured to surround the opening (15) of the closing housing (13), and the mounting ring (17) is configured to attach the moisture-proof device (1) to the mounting interface (28). The apparatus according to item 1 to 6, characterized by

8. The first part (4) and the second part (5) of the casing (2) each have walls in the form of straight cylinders (P1, P2) with first ends (E14, E15) closed and second ends (E24, E25) open, and the first part (4) and the second part (5) are assembled together at their respective second ends (E24, E25), the second end (E25) of the cylinder of the second part (5) of the casing (2) includes a cylindrical shoulder (18), and the second end (E24) of the first part (4) abuts against the cylindrical shoulder (18). The apparatus according to item 1 to 7, characterized by

9. The mounting ring (17) extends the second part (5) of the casing (2) around the cylindrical shoulder (18) and surrounds the second end (E24) of the first part (4) of the casing (2). The moisture-proof device (1) is provided with a circular sealing gasket (19) between the mounting ring (17) and the second end (E24) of the first component (4) of the casing (2), and the sealing gasket (19) is configured to provide a sealed mounting between the moisture-proof device (1) and the closing housing (13). The apparatus according to feature 8.

10. The first orifice (11) of the pressure equilibrium channel (10) opens to the outside of the closed housing (13) through the cylindrical shoulder (18), and the second orifice (12) of the pressure equilibrium channel (10) opens into a diffusion chamber (20) which is in gas communication with the sealed space (14) of the closed housing (13), the diffusion chamber (20) being a recess formed on the first component (4) of the casing (2), and the pressure equilibrium channel (10) extends between the first orifice (11) and the second orifice (12) within the thickness of the wall of the straight cylinder (P1) of the first component (4) of the casing (2). The apparatus according to claim 5 or 6 and claim 8 or 9, characterized by the features described herein.

11. The diffusion chamber (20) is separated from the sealed space (14) by a first membrane (21) configured to allow air to pass between the diffusion chamber (20) and the sealed space (14) and to prevent moisture from passing from outside the closed housing (13) toward the sealed space (14). The apparatus according to feature 10.

12. The communication port (7) of the first component (4) of the casing (2) includes a second membrane (22) configured to allow moisture contained in the sealed space (14) to pass toward the chamber (3). The apparatus according to item 1 to 11, characterized by

13. A vehicle headlamp (29) comprising at least one closed housing (13) housing a light source (30) within a sealed space (14), wherein the vehicle headlamp (29) comprises a moisture-proof device (1) according to any one of claims 1 to 12, wherein the moisture-proof device (1) is mounted within the opening (15) of the closed housing (13) such that the first component (4) of the casing (2) is located within the sealed space (14) and the second component (5) of the casing (2) is located outside the closed housing (13), A vehicle headlamp (29) characterized by the following features.

14. An imaging device comprising at least one closed housing (13) housing a camera within a sealed space (14), wherein the imaging device comprises a moisture-proof device (1) according to any one of claims 1 to 12, the moisture-proof device (1) being mounted within the opening (15) of the closed housing (13) such that the first component (4) of the casing (2) is located within the sealed space and the second component (5) of the casing (2) is located outside the closed housing (13), An imaging device characterized by the following features.

Images