KR102371068B1 - Device for removing moisture for headlamp using latent heat storage material and method for removing moisture for headlamp using the same - Google Patents

Abstract

Disclosed are an apparatus for preventing moisture in a headlamp using a latent heat storage material and a method for preventing moisture in a headlamp using the same. An apparatus for preventing moisture in a headlamp using a latent heat storage material and a method for preventing moisture in a headlamp using the same according to an embodiment of the present invention include: a case fixed to a bezel and accommodating the latent heat storage material; and a gasket interposed between the bezel and the case and a metal fin coupled to the case, wherein the latent heat storage material absorbs heat generated by the vehicle and releases it when the vehicle is stopped to prevent moisture from occurring in the lamp.

Description

DEVICE FOR REMOVING MOISTURE FOR HEADLAMP USING LATENT HEAT STORAGE MATERIAL AND METHOD FOR REMOVING MOISTURE FOR HEADLAMP USING THE SAME

The present invention relates to a device for preventing moisture in a headlamp using a latent heat storage material, and more particularly, to a device for preventing moisture in a headlamp using a latent heat storage material that can prevent moisture generation on a lens surface of a headlamp using a latent heat storage material it's about

The vehicle is equipped with a headlamp so that the driver can monitor the driving direction at night. The headlamp is composed of a headlamp, a turn indicator lamp, a fog lamp, and a reflector that reflects the light of the lamp in a specific direction inside the transparent front cover and the rear cover.

Such a headlamp is preferably kept in a clean state in which moisture does not condense on the lens to ensure good visibility, but moisture in the air may condense on the inner surface of the front cover due to the temperature difference between the inside and the outside. As such, when moisture condenses on the front cover, the light of the headlamp is scattered due to the moisture condensed on the front cover. Because these vehicle headlamps are installed so that the lens part is exposed to the outside of the vehicle body, frost or moisture is generated inside depending on rain, fog, and the surrounding environment. .

1 is a cross-sectional view of a conventional headlamp structure.

Referring to FIG. 1 , the structure of the headlamp includes a high beam 130 located inside the vehicle, that is, on the radiator grill side, and a low beam 150 located outside the vehicle, and the high beam 130 and the low beam 150 are provided. ) along the outer peripheral surface of the periphery is provided with reflectors (140, 160), respectively. In addition, a plurality of bezels 110 including the bezels 111 on the side of the downlights around the reflectors 160 of the downlights 150 are provided. In addition, a lens 120 made of a transparent material that embeds and protects the components of the headlamp and allows light to pass therethrough is provided.

The high beam 130 and the low beam 150 are connected through a power source (not shown) and a wire to emit light, and the reflectors 140 and 160 are emitted from the high beam 130 and the low beam 150 . It is a configuration for collecting the collected light and efficiently emitting it to the outside of the lens 120 . And the plurality of bezels 110 cover the components other than the high beam 130, the low beam 150, and the reflectors 140 and 160 so that they are not visible from the outside, so that the headlamp side can be seen from the outside of the lens 120 It is a composition that makes the exterior look beautiful when

However, such a structure of the conventional headlamp has a problem in that moisture is easily generated. In some cases, moisture occurs due to natural dew condensation, but in some cases, the area where moisture occurs may differ depending on the moisture content or moisture absorption rate of the material inside the headlamp.

Due to the temperature difference between the parts adjacent to the high beam 130 and the low beam 150 and the parts not adjacent to them, moisture (condensation) is generated in the low temperature part (the part having a temperature of about 25° C. or less). This occurs because the air heated by the high beam 130 and the low beam 150 convects in the headlamp and condenses on the low temperature side, where the temperature is low. Specifically, the side indicated by the reference numeral 'A' in FIG. 1 There is a problem that a lot of moisture occurs in the

In addition, although anti-fogging coating is applied to prevent moisture in the headlamp, it is a technology that makes it difficult to observe the generated moisture with the naked eye rather than for the purpose of preventing moisture generation.

As described above, the vehicle headlamp must properly remove moisture generated when it rains or snows in order to secure sufficient night driving visibility at night. There is a problem in that the generated moisture cannot be completely removed.

2 is a graph showing a latent heat storage material.

When the latent heat storage material is described with reference to FIG. 2, the latent heat storage material increases in temperature when it receives heat, and absorbs a lot of heat as the phase changes from a solid to a liquid without a change in temperature at a specific temperature (melting temperature). In this way, when the temperature is lowered as the heat supplied in the state of changing the phase to liquid disappears, heat is released as the phase changes from liquid to solid at a specific temperature (melting temperature).

Here, heat absorbed or emitted while maintaining the same temperature during phase change is called latent heat, and latent heat has tens to hundreds of times the energy storage and release ability compared to sensible heat. The principle of the headlamp moisture prevention device using this latent heat storage material is that the phase changes from solid to liquid due to heat transfer due to engine heat and lamp heat during vehicle driving, storing a lot of heat, and then storing a lot of heat from liquid to solid when the heat source is gone It takes advantage of the phenomenon of releasing a lot of heat as it transforms into

Referring to the table, the melting temperature and latent heat of the latent heat storage material are shown. Considering the internal temperature of the headlamp, it can be seen that Na2S3O3 5H2O and NaCH3COO 3H2O having a melting temperature of 40°C to 50°C are preferable.

Republic of Korea Patent Application No. 10-0737026

In order to overcome the problems of the prior art, an embodiment of the present invention provides a headlamp moisture prevention device using a latent heat storage material that can prevent moisture generation on the lens surface of the headlamp by emitting stored heat using the latent heat storage material. would like to provide

According to an aspect of the present invention, the case is fixed to the bezel for accommodating the latent heat storage material; a gasket interposed between the bezel and the case and a metal fin coupled to the case, wherein the latent heat storage material absorbs heat generated from the vehicle and releases it when the vehicle is stopped or when the engine is turned off to prevent moisture from occurring in the lamp can do.

The case may be bent multiple times to form an open inner space at one side.

A latent heat storage material may be filled in the inner space formed by the case and the bezel.

When the latent heat storage material is heated, a phase change is made from a solid to a liquid, and latent heat may be stored.

When heating of the latent heat storage material is stopped, a phase change is made from a liquid to a solid, and heat may be released.

The case may have a structure in which through holes through which a plurality of protrusions formed on a metal pin pass are perforated.

The through-holes may have a structure in which they are spaced apart from each other.

The case may be located on an outboard of the headlamp.

The gasket may have a structure that is seated in the indentation groove of the bezel.

The case may have a structure in which coupling holes for screwing with the bezel are perforated.

The metal pin may have a plate-like shape.

The metal fin may have a structure in which a plurality of protrusions for heat transfer are formed.

The protrusions may be formed to be spaced apart from each other.

Ends of the protrusions may be located in a space formed by the bezel and the case.

The bezel may have a structure in which fastening holes for screwing with the case are perforated.

The bezel, the gasket, and the case may be coupled by screwing them together.

According to another aspect of the present invention, the case is fixed to the bezel for accommodating the latent heat storage material; and a gasket interposed between the bezel and the case and a metal fin coupled to the bezel, wherein the latent heat storage material absorbs heat generated from the vehicle and releases it when the vehicle is stopped to prevent moisture from occurring in the lamp.

The bezel may have a structure in which through-holes through which the protrusions formed on the metal pins pass are perforated.

According to another aspect of the present invention, in a method for preventing moisture in a headlamp, (a) starting a vehicle driving step, (b) turning on the headlamp and operating the engine, (c) the headlamp lighting heat and the engine heat are latent heat It may include a step of transferring the heat storage material, (d) stopping and starting the vehicle off, and (e) preventing and removing moisture from the lens surface of the headlamp.

Between the steps (c) and (d), (f) the latent heat storage material may include a phase change from a solid to a liquid.

The step of changing the phase from the solid to the liquid may be made in the range of 40 ℃ to 50 ℃.

In step (f), latent heat may be stored during a phase change.

Between the steps (d) and (e), (g) the latent heat storage material may include a phase change from a liquid to a solid.

In step (g), heat may be applied to the lens surface in the range of 5 to 10 minutes.

The phase change from liquid to solid may be performed in a range of 40°C to 50°C.

Step (e) may be made by increasing the temperature of the lens surface above the dew point temperature.

According to one embodiment of the present invention, in the headlamp moisture prevention device using a latent heat storage material, the latent heat storage material is placed in a moisture generating area such as the lower part of the lens surface, and the phase changes from liquid to solid when the vehicle is stopped. It is possible to prevent the occurrence and provide an effect of removing moisture.

In addition, the temperature inside the headlamp decreases due to the heat storage ability of the latent heat storage material, which reduces the dew point temperature.

In addition, the latent heat storage material operates through a cycle of heat storage and heat release due to phase change during driving and stopping, so it can be used semi-permanently, so there is no need for replacement or repair. Unlike driving a fan for an increase, a separate power source is not required, and thus the configuration is simple, thereby achieving a compact structure and reducing costs.

1 is a cross-sectional view of a conventional headlamp structure.
2 is a graph showing a latent heat storage material.
3 is a schematic diagram showing the overall configuration of a headlamp moisture prevention device using a latent heat storage material according to an embodiment of the present invention.
4 is a schematic diagram illustrating a structure in which a headlamp moisture prevention device using a latent heat storage material is installed according to an embodiment of the present invention.
FIG. 5 is a view showing a cross section AA of FIG. 4 .
FIG. 6 is an enlarged view of part B of FIG. 5 .
7 is a schematic diagram illustrating a heat transfer and storage path of a headlamp moisture prevention device using a latent heat storage material according to an embodiment of the present invention.
8 is a side view of a headlamp moisture prevention device using a latent heat storage material installed in a partial area of the bezel.
9 is a side view of a headlamp moisture preventing device using a latent heat storage material installed on the entire lower end of the bezel.
10 is a side view of a headlamp moisture prevention device using a latent heat storage material installed on the entire lower end of the bezel.
11 is a side view of a headlamp moisture prevention device using a latent heat storage material installed in a part of the bezel.
12 is a coupling diagram illustrating a detailed configuration of a headlamp moisture prevention device using a latent heat storage material according to an embodiment of the present invention.
13 is an exploded perspective view of a headlamp moisture preventing device using a latent heat storage material according to an exemplary embodiment of the present invention of FIG. 12 .
14 is a schematic diagram illustrating heat-conducting media made of a metal material.
15 is a flowchart illustrating an operation sequence of an apparatus for preventing moisture in a headlamp using a latent heat storage material according to an embodiment of the present invention.

The embodiments described below are provided so that those skilled in the art can easily understand the technical spirit of the present invention, and the present invention is not limited thereto. In addition, matters expressed in the accompanying drawings may be different from the forms actually implemented in the drawings schematically for easy explanation of the embodiments of the present invention.

When a component is referred to as being connected or connected to another component, it may be directly connected or connected to the other component, but it should be understood that another component may exist in between.

And, "connection" herein includes direct connection and indirect connection between one member and another member, and may refer to all physical connections such as adhesion, attachment, fastening, bonding, and bonding.

In addition, expressions such as 'first, second', etc. are used only for distinguishing a plurality of components, and do not limit the order or other characteristics between the components.

The singular expression includes the plural expression unless the context clearly dictates otherwise. Terms such as “comprising” or “having” are intended to mean that a feature, number, step, action, component, part, or combination thereof described in the specification exists, and one or more other features or numbers, It may be construed that steps, operations, components, parts, or combinations thereof may be added.

3 is a schematic diagram showing the overall configuration of a headlamp moisture prevention device using a latent heat storage material according to an embodiment of the present invention.

Referring to FIG. 3 , an overall system configuration of a headlamp moisture prevention device using a latent heat storage material according to an embodiment of the present invention is schematically shown. It is a principle of removing moisture by increasing the temperature on the lens surface due to convection by installing a moisture prevention device (B) equipped with a latent heat accumulating material on the lower part of the lens surface and the inboard outboard. As shown in the figure, when the lamp is turned on, melting starts from the latent heat storage material of the lamp lighting unit, and as shown by the arrow, the heat transfer and melting to the side part through the metal heat-conducting medium occurs.

4 is a schematic diagram showing a structure in which a device for preventing moisture in a headlamp using a latent heat storage material according to an embodiment of the present invention is installed, FIG. 5 is a view showing a cross section AA of FIG. 4 , and FIG. It is an enlarged view of a portion, and FIG. 7 is a schematic diagram illustrating a heat transfer and storage path of a headlamp moisture prevention device using a latent heat storage material according to an embodiment of the present invention.

4 to 7, the latent heat storage material moisture prevention device is located on the outboard of the headlamp, which is a major area where moisture occurs due to the relatively low temperature of the lens surface of the outboard part, so heat is applied to this part It is possible to prevent moisture from occurring if the temperature is raised by transmission.

Here, referring to cross section AA in which the latent heat storage material moisture prevention device is located, the upper case 110 of the latent heat storage material moisture prevention device assembled with the bezel 140 , and latent heat between the upper case 110 and the bezel 140 . It has a structure in which a metal heat-conducting medium for improving heat transfer between the heat storage material 150 and the latent heat storage material 150 is located, and a more detailed structure will be described later.

According to the present invention, the bezel 140 and the upper case 110 of the latent heat storage material are coupled by bolts or heat fusion bonding, and a gasket 120 for preventing the leakage of the latent heat storage material in a liquid state is inserted and coupled to the bonding portion. The structure of the latent heat storage material moisture prevention device will be described in detail below.

Referring back to FIG. 7 , a heat transfer and storage path is shown when the vehicle is driving. When engine heat and lamp lighting heat are transferred to the existing bezel 140 , the latent heat storage material 150 in contact with the bezel 140 is When the heat is transferred and the latent heat storage material 150 is in the range of 40° C. to 50° C. while the temperature rises, a phase change starts from a solid to a liquid, and a lot of latent heat is stored at this time.

When the engine is turned off when the vehicle is stopped, heat is no longer transferred to the latent heat storage material moisture prevention device, so when the temperature of the latent heat storage material 150 decreases and decreases to 40 to 50° C., the phase change from liquid to solid begins. A lot of heat (40-50°C) is released.

8 is a side view of a headlamp moisture prevention device using a latent heat storage material installed in a partial area of the bezel, FIG. 9 is a side view of a headlamp moisture prevention device using a latent heat storage material installed on the entire lower end of the bezel, and FIG. 10 is a bezel A side view of a headlamp moisture prevention device using a latent heat storage material installed on the entire lower end of the It is a coupling diagram showing a detailed configuration of a headlamp moisture prevention device using a latent heat storage material according to an embodiment, and FIG. 13 is an exploded view of the headlamp moisture prevention device using a latent heat storage material according to an embodiment of the present invention of FIG. 12 is a perspective view.

8 to 13 , the device for preventing moisture in a headlamp using a latent heat storage material according to the present invention is located on the outboard of the headlamp, and is fixed to the bezel 140 to accommodate the latent heat storage material 150 . It is configured to include a case 110, a gasket 120 interposed between the bezel 140 and the case 110, and a metal pin 130 coupled to the case 110, and the latent heat storage material ( 150) absorbs heat generated from the vehicle and releases it when the vehicle is stopped to prevent moisture from occurring in the lamp.

In one specific example, the case 110 is bent multiple times to form an inner space with one side open, and is combined with the bezel 140 to form an inner space, and the case 110 and the bezel 140 ), the latent heat storage material 150 is filled in the inner space formed by. When the latent heat storage material 150 is heated, a phase change is made from a solid to a liquid to store latent heat, and when the heating of the latent heat storage material 150 is stopped, a phase change is made from a liquid to a solid and heat is released.

The case 110 of the headlamp moisture prevention device according to the present invention is located on the outboard of the headlamp, and in the case 110, through holes through which the projections formed on the plate-shaped metal pin 130 pass are perforated. and the through holes are drilled to be spaced apart from each other.

On the other hand, the gasket 120 has a structure that is seated in the indentation groove of the bezel 140, and the case 110 is provided with coupling holes for screwing with the bezel 140, and similarly, the bezel 140 has a structure. The case 110 and screw fastening holes are drilled so that the bezel 140, the gasket 120, and the case 110 are screwed and coupled.

Protrusions for heat transfer are formed on the metal fin 130 , the protrusions are spaced apart from each other, and ends of the protrusions are located in the space formed by the bezel 140 and the case 110 .

The metal fin 130 is made of a metal material such as aluminum as a heat conductive medium of a metal material. Such a heat-conducting medium is located in a direction in which heat is transmitted and may be implemented in a form in which the case 110 is perforated and inserted, or may be implemented in a form in which the case 110 is perforated and inserted into the existing bezel 140 as in another embodiment below. The metal fin 130 having the above structure promotes phase change by evenly transmitting the engine room and lamp lighting heat to the latent heat storage material.

Here, referring to FIG. 11 , an apparatus for preventing moisture in a headlamp using a latent heat storage material according to another exemplary embodiment of the present invention is illustrated.

As described above, the headlamp moisture preventing device using the latent heat storage material is fixed to the bezel 140 and interposed between the case 110 accommodating the latent heat storage material 150 and the bezel 140 and the case 110 . It is configured to include a gasket 120 and a metal fin 130 coupled to the case 110 to improve heat transfer of the latent heat storage material 150 .

Through-holes through which the protrusions formed on the metal pins 130 pass are perforated in the bezel 140 . That is, the headlamp moisture prevention device using the latent heat storage material of FIG. 10 has a structure in which the metal pin 130 is coupled to the case 110, but the headlamp moisture prevention device using the latent heat storage material of FIG. 11 has a bezel 140 As a structure in which the metal fin 130 is coupled to the metal fin 130, the overlapping description of the same structure will be omitted except for such a difference.

14 is a schematic diagram illustrating heat-conducting media made of a metal material.

Referring to FIG. 14 , the metal fin 130 is made of a metal material such as aluminum, and may be formed in various forms such as a mesh structure, a honeycomb structure, and metal powder. This is to prevent the phase change of only the portion receiving heat due to the low thermal conductivity of the latent heat storage material itself and to promote the phase change of the latent heat storage material as a whole.

15 is a flowchart illustrating a method for preventing moisture in a headlamp using a device for preventing moisture in a headlamp using a latent heat storage material according to an embodiment of the present invention.

Referring to FIG. 15 , a series of processes according to an embodiment of the method for preventing moisture in the headlamp is shown. First, (a) the vehicle starts driving, (b) the headlamp is turned on and the engine is operated. (c) Headlamp lighting and engine heat are transferred to the latent heat storage material when the headlamp is turned on and the engine is operated. If the vehicle's heat is transferred to the latent heat storage material while driving, (d) the vehicle is stopped and the engine is turned off to stop.

Here, between the steps (c) and (d), (f) the latent heat storage material is configured to include a phase change from a solid to a liquid. Specifically, the step of changing the phase from the solid to the liquid is performed in the range of 40 °C to 50 °C, and latent heat is stored during the phase change. That is, during the phase change of the latent heat storage material, the latent heat storage material can store tens to hundreds of times more heat than sensible heat (heat that increases without a phase change) while maintaining a uniform temperature of 40°C to 50°C due to latent heat storage. there will be When the phase change is made, the temperature of the latent heat storage material is also increased (rising sensible heat, 40°C to 50°C).

Subsequently, (d) stopping and starting the vehicle is stopped by turning it off, and (e) moisture is prevented and removed from the lens surface of the headlamp. Between the steps (d) and (e), (g) the latent heat storage material is configured to include a phase change from a liquid to a solid. In step (g), heat is applied to the lens surface in the range of 5 to 10 minutes, and the phase change from liquid to solid is performed in the range of 40°C to 50°C. Here, in step (e), the temperature of the lens surface rises above the dew point temperature.

Specifically, when the vehicle is stopped and the ignition is off, the engine and headlamp lighting heat is no longer transmitted, so the phase change from liquid to solid starts when the temperature of the latent heat storage material drops to 40°C to 50°C while the temperature of the latent heat storage material also decreases. and the latent heat storage material discharges heat to the outside while maintaining 40 to 50 °C until the phase change is completed. At this time, the heat emitted to the outside (the lower part of the lens surface, inboard and outboard, etc.) raises the temperature of the lens surface. Moisture does not occur on the surface, and even if moisture occurs, heat of 40° C. to 50° C. is continuously transmitted for a certain period of time, so it can be quickly removed. Therefore, when such a cycle is regarded as one cycle, semi-permanent use is possible as a continuous cycle.

Therefore, according to one embodiment of the present invention, the headlamp moisture prevention device using the latent heat storage material places the latent heat storage material in the moisture generating area, such as the lower part of the lens surface, so that the phase changes from liquid to solid when the vehicle is stopped. Due to this, it is possible to provide an effect of preventing moisture generation.

In addition, due to the heat storage capacity of the latent heat storage material, the temperature inside the headlamp decreases, reducing the possibility of moisture on the headlamp lens surface, and the latent heat storage material can be used semi-permanently, so replacement and repair are unnecessary. , a separate power source is not required, unlike a heated sheet inside the headlamp, a heating film, and a fan drive to increase flow.

Those of ordinary skill in the art to which the present invention pertains will understand that the present invention may be embodied in other specific forms without changing the technical spirit or essential characteristics thereof. Therefore, the embodiments described above are only presented by selecting and presenting the most preferred embodiments in order to help those skilled in the art understand from among various possible embodiments, and the technical spirit of the present invention is not necessarily limited or limited only by the presented embodiments. No, it is pointed out that various changes, additions, and changes are possible within the scope of the present invention without departing from the technical spirit of the present invention, as well as other equivalent embodiments are possible. The scope of the present invention is indicated by the following claims rather than the above detailed description, and all changes or modifications derived from the meaning and scope of the claims and their equivalent concepts are included in the scope of the present invention. should be interpreted In addition, on the basis of the principle that the inventor can appropriately define the concept of a term to describe his invention in the best way, the terms or words used in the present specification and claims are defined, and conventional or dictionary It should not be construed as being limited only in meaning. In addition, the order of the components described in the above process does not necessarily have to be performed in a time series order, and even if the execution order of each component and step is changed, if the gist of the present invention is satisfied, such a process may fall within the scope of the present invention. of course there is

110: case 120: gasket
130: metal pin 140: bezel
150: latent heat storage material

Claims (26)

a case fixed to the bezel and accommodating the latent heat storage material;
a gasket interposed between the bezel and the case; and
a metal pin coupled to the case;
including,
The latent heat storage material absorbs heat generated by the vehicle and releases it when the vehicle is stopped or when the engine is turned off to prevent moisture from occurring in the lamp. The method of claim 1,
The case is bent a number of times to form a headlamp moisture preventing device, characterized in that one side is in a shape to form an open inner space. 3. The method of claim 2,
The headlamp moisture prevention device, characterized in that the inner space formed by the case and the bezel is filled with a latent heat storage material. The method of claim 1,
The headlamp moisture prevention device, characterized in that the latent heat storage material undergoes a phase change from a solid to a liquid when heated to store latent heat. The method of claim 1,
The latent heat storage material undergoes a phase change from liquid to solid when heating is stopped, and heat is emitted. The method of claim 1,
The headlamp moisture prevention device, characterized in that the case has through-holes through which a plurality of projections formed on the metal pins pass. 7. The method of claim 6,
The headlamp moisture prevention device, characterized in that the through holes are drilled to be spaced apart from each other. The method of claim 1,
The case is a headlamp moisture prevention device, characterized in that located on the outboard of the headlamp. The method of claim 1,
The headlamp moisture prevention device, characterized in that the gasket is seated in the indentation groove of the bezel. The method of claim 1,
The headlamp moisture prevention device, characterized in that the case is perforated with coupling holes for fastening the bezel and screws. The method of claim 1,
The headlamp moisture prevention device, characterized in that the metal pin has a plate-like shape. The method of claim 1,
The headlamp moisture prevention device, characterized in that the metal fin is formed with a plurality of projections for heat transfer. 13. The method of claim 12,
The headlamp moisture prevention device, characterized in that the projections are formed to be spaced apart from each other. 13. The method of claim 12,
The headlamp moisture preventing device, characterized in that the ends of the projections are located in the space formed by the bezel and the case. The method of claim 1,
The headlamp moisture prevention device, characterized in that the bezel is perforated with fastening holes for screwing the case and the screw. The method of claim 1,
The headlamp moisture prevention device, characterized in that the bezel, the gasket, and the case are screwed together. a case fixed to the bezel and accommodating the latent heat storage material;
a gasket interposed between the bezel and the case; and
a metal pin coupled to the bezel;
including,
The latent heat storage material absorbs heat generated by the vehicle and releases it when the vehicle is stopped to prevent moisture from occurring in the lamp. 18. The method of claim 17,
The headlamp moisture prevention device, characterized in that the bezel is perforated through holes through which the projections formed on the metal pins pass. 17. A method for preventing moisture in a headlamp of the device according to any one of claims 1 to 16, comprising:
(a) starting to drive the vehicle;
(b) headlamp lighting and engine operation phase;
(c) transferring headlamp lighting heat and engine heat to a latent heat storage material;
(d) stopping the vehicle and turning off the ignition, and
(e) preventing and removing moisture from the lens surface of the headlamp
Headlamp moisture prevention method comprising a. 20. The method of claim 19,
Between the steps (c) and (d), (f) a phase change of the latent heat storage material from a solid to a liquid. 21. The method of claim 20,
The step of changing the phase from the solid to the liquid is a headlamp moisture prevention method, characterized in that made in the range of 40 ℃ to 50 ℃. 21. The method of claim 20,
In the step (f), the headlamp moisture prevention method, characterized in that the latent heat is stored during the phase change. 20. The method of claim 19,
A method for preventing moisture in a headlamp, characterized in that, between steps (d) and (e), (g) phase change of the latent heat storage material from a liquid to a solid. 24. The method of claim 23,
In step (g), heat is applied to the lens surface in the range of 5 to 10 minutes. 24. The method of claim 23,
The step of changing the phase from the liquid to the solid is a headlamp moisture prevention method, characterized in that made in the range of 40 ℃ to 50 ℃. 20. The method of claim 19,
The step (e) is a headlamp moisture prevention method, characterized in that the temperature of the lens surface rises above the dew point temperature.

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