KR20170116352A - Cellular phone case having a function of liquid spray - Google Patents

Abstract

The present invention relates to a liquid crystal display comprising a rear cover mounted on a rear surface of a cellular phone so that a front display part of the cellular phone can be opened, And a liquid spraying means for spraying the liquid spraying means.
According to the present invention, when the mobile phone case is used, it is easy to use and carry, and the liquid can be sprayed to the outside at the same time while containing various liquids such as perfume, hand sanitizer, liquid soap, fiber perfume, mobile phone disinfectant, toilet cover disinfectant, It can be used in various forms such as toiletries, cleaning products, and hygiene products.

Description

TECHNICAL FIELD [0001] The present invention relates to a cellular phone case having a liquid injection function,

The present invention relates to a mobile phone case having a liquid spraying function, and more particularly, to a mobile phone case having a liquid spraying function, and more particularly, to a mobile phone case having a liquid spraying function, The present invention relates to a mobile phone case having a liquid jetting function, which is advantageous in that it can be used in various forms such as beauty products, cleanliness products and sanitary products.

2. Description of the Related Art Generally, a light / soft cellular phone case is used as a means for safely protecting a cellular phone from external impacts or infiltration of foreign substances, and as a means for expressing a user's individuality,

Generally, a mobile phone case is manufactured in the same size and shape as the outer appearance of a mobile phone and must be tightly adhered to the mobile phone. Therefore, a protruding locking protrusion, which is resiliently fitted in various locking grooves formed on the side of the mobile phone, .

On the other hand, there are a myriad of products available for general spray sizes and applications. Among them, bulky spray used in the home occupies a large part, and small and medium spray which can be carried around in a bag or the like is widely used.

However, as described above, there is a problem that the spray used at home is not portable because it is bulky and portable. If you inevitably carry it, you need a separate bag. In addition, although the size of a small / medium spray is small, it is inconvenient to use it as a portable device since it is bulky to carry in pants or pocket bags. Thus, there is a need for a portable and easy-to-use spray, such as a mobile phone case that people can conveniently carry and use.

In addition, there is a demand for a technique that can be conveniently carried and sprayed through various liquids such as perfume, hand sanitizer, liquid soap, fiber perfume, cell disinfectant, toilet cover disinfectant, and the like.

Korean Patent Publication No. 10-2015-0141092 (published on Dec. 17, 2015) Korean Patent Laid-Open No. 10-2015-0066443 (Publication date: 201.06.06)

It is an object of the present invention to provide a cosmetic composition containing various liquids such as a perfume, a hand sanitizer, a liquid soap, a fiber perfume, a mobile phone disinfectant, a toilet cover disinfectant, Which can be used in the form of a liquid.

In order to accomplish the above object, a mobile phone case having a liquid ejecting function according to the present invention includes a rear cover mounted on a rear surface of a mobile phone so that a front display portion of the mobile phone can be opened, And liquid spraying means mounted on the rear cover for spraying the liquid in the liquid storage space to the outside.

In order to accomplish the above object, a mobile phone case having a liquid injection function according to the present invention includes a liquid storage space mounted on a rear surface of the mobile phone so as to open a front display part of the mobile phone, And a liquid spraying means attached to the rear cover and spraying the liquid inside out, and the liquid spraying means may be configured to spray liquid to the rear surface of the mobile phone.

In order to accomplish the above object, a mobile phone case having a liquid injection function according to the present invention includes a liquid storage space mounted on a rear surface of the mobile phone so as to open a front display part of the mobile phone, And a liquid spraying means mounted on the rear cover and the rear cover so as to inject the liquid inside out, including an inlet valve, an outlet valve, a valve stopper, a piston and a spring.

In order to accomplish the above object, a mobile phone case having a liquid injection function according to the present invention includes a liquid storage space mounted on a rear surface of the mobile phone so as to open a front display part of the mobile phone, And a liquid spraying means mounted on the rear cover for spraying the liquid in the liquid storage space to the outside, wherein the liquid spraying means is slidable in the vertical direction of the rear cover, And a switch for injecting the liquid in the storage space to the outside may be formed.

In order to accomplish the above object, a mobile phone case having a liquid injection function according to the present invention includes a liquid storage space mounted on a rear surface of the mobile phone so as to open a front display part of the mobile phone, And a liquid spraying means mounted on the rear cover and spraying the liquid in the liquid storage space to the outside, wherein the rear cover is coated with a binder of an adhesive component on an opposite surface facing the rear surface of the mobile phone, As shown in FIG.

The rear cover may be provided with a liquid spraying device mounting groove for mounting the liquid spraying means.

The liquid spraying means may be formed with a suction pipe inserted into the liquid storage space and sucking the liquid.

The liquid spraying means may include a switch for injecting the liquid in the liquid storage space to the outside, and a protruding support portion connected to the switch and inserted and fixed into the rear cover.

The back cover may be provided with a flow rate check part capable of checking the amount of liquid in the liquid storage space.

A glossy or non-glossy spray coating layer may be formed on the outer surface of the rear cover.

In order to accomplish the above object, a mobile phone case having a liquid injection function according to the present invention includes a liquid storage space mounted on a rear surface of the mobile phone so as to open a front display part of the mobile phone, And a liquid spraying unit mounted on the rear cover and spraying the liquid in the liquid storage space to the outside, wherein the rear cover is made of a polycarbonate (PC) resin and an ABS (Acrylonitrile Butyl Terephthalene Hybrid Polymer Resin) resin.

In order to accomplish the above object, a mobile phone case having a liquid injection function according to the present invention includes a liquid storage space mounted on a rear surface of the mobile phone so as to open a front display part of the mobile phone, And a liquid spraying means mounted on the rear cover and spraying the liquid in the liquid storage space to the outside, wherein a spray coating layer may be formed on the rear cover with a metal powder containing aluminum, .

The coating layer may further include a metal powder selected from the group consisting of silver (Ag) and copper.

The coating layer may be formed to a thickness of 0.2 to 0.8 mu m.

A boron carbide coating layer may be further formed on the rear cover.

The mobile phone case having a liquid spraying function according to the present invention is easy to use and portable and includes various liquids such as perfume, hand sanitizer, liquid soap, fiber perfume, mobile phone disinfectant, toilet cover disinfectant, So that it can be used in various forms such as beauty products, cleaning products and sanitary products.

1 is a schematic view showing a front surface and a right side surface of a mobile phone case having a liquid ejecting function according to an embodiment of the present invention.
2 is a schematic view showing a state in which a liquid spraying means is separated from a mobile phone case having a liquid spraying function according to an embodiment of the present invention.
3 is a schematic view showing a state in which a liquid inside the rear cover is sprayed by a switch movement of a liquid spraying means in a mobile phone case having a liquid spraying function according to an embodiment of the present invention.
4 is an enlarged view of an enlarged view of a state in which a liquid is sprayed by a switch movement of a liquid spraying means in a mobile phone case having a liquid spraying function according to an embodiment of the present invention.
5 is an enlarged view of an enlarged view of a switch portion of a liquid spraying means in a mobile phone case having a liquid spraying function according to an embodiment of the present invention.
6 is a schematic view showing a spray pump structure of a liquid spraying means in a mobile phone case having a liquid spraying function according to an embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear. In the following description of the embodiments of the present invention, specific values are only examples.

FIG. 1 is a schematic view showing a front face and a right side face of a mobile phone case having a liquid jetting function according to an embodiment of the present invention. FIG. 3 is a schematic view showing a state in which the liquid inside the rear cover is sprayed by the movement of the switch of the liquid spraying means in the mobile phone case having the liquid spraying function according to the embodiment of the present invention Fig.

FIG. 4 is an enlarged view showing an enlarged view of a state in which a liquid is sprayed by a switch movement of a liquid spraying means in a mobile phone case having a liquid spraying function according to an embodiment of the present invention. FIG. 6 is an enlarged view of an enlarged view of a switch portion of a liquid spraying means in a mobile phone case having a liquid spraying function according to an example of the present invention. A schematic diagram showing a spray pump structure is shown.

Referring to these drawings, a mobile phone case 100 having a liquid-jetting function according to the present invention is mounted on a rear surface of a mobile phone so that a front display portion of the mobile phone can be opened, and includes a liquid storage space 111 And a liquid spraying means 120 mounted on the rear cover 110 for spraying the liquid in the liquid storage space 111 to the outside.

That is, in the mobile phone case 100 having the liquid injection function according to the present invention, the liquid storage space 111 is formed in the rear cover 110, and the liquid storage space 111, which is mounted on the rear cover 110, And a liquid spraying means 120 for spraying the liquid inside thereof to the outside so that the liquid can be sprayed to the outside while containing various liquids such as perfume, hand sanitizer, liquid soap, fiber perfume, mobile phone disinfectant, toilet cover disinfectant, So that it can be used in various forms such as beauty products, cleaning products, and sanitary products.

Here, the user of the mobile phone case 100 having the liquid injection function can use a perfume liquid suitable for his or her taste into the liquid storage space 111. In addition, since it is formed in a structure in which it is closely attached to the rear surface of the cellular phone H as a whole, it is advantageous in that a liquid storage space is easily secured and space utilization is excellent as a compact and stable structure.

The perfume may be, for example, a bergamot liquid, a neroli liquid, a jasmine liquid, a ylang ylang liquid, a rosewood liquid, a petitgrain liquid, a grapefruit grapefruit juice, sweet orange juice, lemon juice, Frankincense juice, neroli juice, melissa juice, bergamot juice, lavenere juice, lime juice, a lemon solution, a cedarwood atlantica solution, a ginger solution, a rosemary solution, a sandalwood solution, a bergamot (Bergamot solution), a lemon solution, a lemongrass solution, ), Chamomile roman liquid, mandarin liquid, and the like.

The mobile phone case 100 having the liquid injection function according to the present invention is mounted on the rear surface of the mobile phone so that the front display portion of the mobile phone H can be opened and has a liquid storage space 111 for storing liquid therein And a liquid spray means (120) mounted on the rear cover (110) for spraying liquid inside the liquid spray means (120), wherein the liquid spray means (120) May be formed to inject liquid.

That is, the mobile phone case having the liquid spraying function may be formed such that the liquid spraying means 120 injects liquid in a side or up and down direction of the mobile phone H, but a compact and stable structure of the mobile phone case 100 The liquid may be sprayed onto the rear surface of the cellular phone H, preferably in consideration of convenience when using the spraying means.

A mobile phone case 100 having a liquid injection function according to the present invention includes a rear cover 110 mounted on a rear surface of the mobile phone so that a front display portion of the mobile phone can be opened, A liquid spraying means 120 including an inlet valve 123b, an outlet valve 123a, valve stoppers 122a and 122b, pistons 126a and 126b and a spring 124 so as to inject the liquid to the outside Lt; / RTI > At this time, the pistons 126a and 126b are connected to the switch 126 and may be formed of a spring 124 pressure plate 126b and a pressing rod 126b.

The liquid spray means 120 including the inlet valve 123b, the outlet valve 123a, the valve stoppers 122a and 122b, the pistons 126a and 126b and the spring 124 has a simple and compact structure And at the same time, the liquid spraying function is exhibited stably even when repeatedly used.

The mobile phone case 100 having a liquid injection function according to the present invention is mounted on the rear surface of the mobile phone so that the front display portion of the mobile phone can be opened and has a liquid storage space 111 for storing liquid therein, (110) and liquid spraying means (120) mounted on the rear cover (110) and spraying liquid in the liquid storage space (111) to the outside, and the liquid spraying means (120) And a switch 126 for ejecting the liquid in the liquid storage space 111 to the outside by pressurization may be formed.

That is, since the switch 126 for ejecting the liquid in the liquid storage space 111 is formed by sliding in the vertical direction of the rear cover 110, The liquid spraying means 120 can be driven by the switch 126, which is formed in a flat structure on the rear surface of the mobile phone case, is compact, has excellent space utilization, and is easy to use.

A mobile phone case having a liquid ejecting function according to the present invention includes a rear cover 110 mounted on a rear surface of a cellular phone so that a front display part of the mobile phone can be opened and having a liquid storage space 111 for storing liquid therein, And liquid spray means (120) mounted on the rear cover (110) and spraying liquid in the liquid storage space (111) to the outside, wherein the rear cover (110) A binder of an adhesive component may be applied to the first and second electrodes 116a and 116b and may be detachably coupled to the mobile phone.

That is, the mobile phone case 100 having a liquid-jetting function according to the present invention is provided with facing surfaces 116a and 116b facing the rear surface of the mobile phone so that the mobile phone can be easily attached or detached without depending on a separate jaw, ) With a binder of an adhesive component. Therefore, it is possible to prevent scratches caused by attaching the jaws to the outer surface of the mobile phone, to eliminate the troubles when attaching or detaching the mobile phone, and to improve the aesthetics of the mobile phone case.

The rear cover 110 may be provided with a liquid spraying means mounting groove 120 on which the liquid spraying means 120 is mounted. The groove portion may be formed in various shapes such as a thickness direction groove portion of the rear cover 110, a planar direction groove portion extending vertically or horizontally, etc. Preferably, a planar groove portion is additionally formed in the thickness direction groove portion, The groove portion of the structure can be formed.

The liquid spraying unit 120 may be formed with a suction pipe 125 extending into the liquid storage space 111 and sucking the liquid. The suction pipe 125 may be formed as a long tube-shaped suction pipe 125 so as to extend into the liquid storage space 111. The long tube-shaped suction pipe 125 facilitates the positional designing of mounting the liquid spraying means 120 on the rear cover 110 and allows the liquid in the liquid storage space 111 to be stably stored (120). ≪ / RTI > The suction pipe is coupled to the liquid inlet 125a of the liquid spraying means 120 and inserted into the inlet 111a of the liquid storage space 111 of the rear cover 110. [

The liquid spraying means 120 is provided with a switch 126 for injecting the liquid in the liquid storage space 111 to the outside and a protruding support portion 127 connected to the switch 126 and inserted and fixed into the rear cover . That is, when the switch 126 of the liquid spraying means 120 slides in the vertical direction of the rear cover 110, when the liquid spraying means 120 is used, the liquid spraying means 120 is moved to the rear cover The protruding support portion 127 may be formed on the switch 126 so as to serve as a fixing means for stably fixing the protruding portion 127 to the protruding support portion 110.

3, when the switch 126 of the liquid spraying means 120 is fixed to the upper portion of the liquid spraying means 120, a sealing means (not shown) for sealing the liquid outlet 121 of the liquid spraying means 120 When the switch 126 is slid and moves to the lower portion of the liquid spraying means 120, the switch 126 is moved downward as the protrusion support portion 127, 112 so that the liquid spraying means 120 can stably be mounted on the rear cover 110 even when the liquid spraying means 120 is driven by the pressure of the switch 126 have.

The rear cover 110 may include a flow rate check unit 113 for checking the amount of liquid in the liquid storage space 111. It is possible to use the mobile phone case having the liquid jetting function more efficiently by checking the amount of the liquid inside through the flow rate check unit 113 and using the liquid spraying unit 120. [

A glossy or non-glossy spray coating layer may be formed on the outer surface of the rear cover 110. Such a coating layer has an advantage of remarkably improving the scratch resistance and durability of the cellular phone case.

The material of the mobile phone case can be manufactured by injection molding, for example, by pouring a slurry in which a PC (Polycarbonate) resin and an ABS (Acrylonitrile butadiene styrene resin) resin are appropriately blended into a mold for a mobile phone. Thereafter, the cell phone case is subjected to a drying process, spray coating is carried out with a metallic powder containing aluminum on the outside of the cell phone case, and aluminum or silver or copper conductive material And spray-coating the coating to a thickness of approximately 1 to 30 mu m.

In addition, the spray coating layer formed on the cell phone case is formed to have a thickness of several tens of 탆 to protect the case. After a certain period of time, the cell phone case exposed to the outside is partially worn or partly worn on the edge of the cell phone, The coating layer is peeled off. Therefore, if the boron carbide coating layer is formed on the surface of the base material and the spray coating layer of the mobile phone case, the scratch resistance can be improved and the durability of the mobile phone case can be further improved even if the mobile phone case is exposed to the use environment.

The deposition of the boron carbide coating layer is performed by a sputtering method which is one of PVD (physical vapor deposition method) methods. This is because the PVD method can produce various compositions including low-temperature deposition (room temperature deposition), coating without pollutant discharge, coating on a simple shape base material, deposition only in the plasma (8) region, smooth surface shape and amorphous phase , It is preferable to deposit a film on the base material 1 of the cellular phone case by a sputtering method, which is close to a flat surface rather than a complicated shape.

Preferably, the boron carbide coating layer 3 on which the base material is deposited by the sputtering method is formed to a thickness of 0.02 to 1 탆 and can be used semi-permanently without being peeled while maintaining a high hardness.

When the boron carbide coating layer 3 is deposited on the surface of the base material on which the spray coating layer is formed, the inside of the sputtering apparatus is in a plasma state in a hydrocarbon gas atmosphere containing argon (Ar) gas or reactive methane (CH 4) gas.

Hereinafter, a method for manufacturing a mobile phone case according to the present invention will be described in detail.

First, the base material of the cellular phone case is prepared through a step of forming the base material by a manufacturing apparatus and then applying a glossy or non-light spray coating layer to the base material surface.

A boron carbide target is prepared as a sputtering material for enhancing scratch resistance and adhesiveness of a mobile phone case material to the sputtering apparatus, and the inside of the apparatus is maintained in a vacuum state. At this time, the deposition of the boron carbide coating layer is performed while controlling the deposition time within 1 hour at a process pressure of 1 to 10 mtorr without heating the substrate.

As a specific deposition condition, the substrate holder of the sputtering apparatus is maintained at an ultrahigh vacuum (10-7 torr) or more by using a vacuum pump or the like, argon and methane gas are introduced into the argon gas inlet 13 at 5 to 80 scm and methane 0.4 to 1.6 vol% at a gas inlet, and a DC power source 11 of 0.5 to 5.5 W / cm < 2 > When the base material is placed in the sputtering apparatus under the above conditions, the surface of the base material 1 is cleaned (cleaned) by RF bias.

The mechanical properties show a maximum critical load of up to 40 N at a methane ratio of about 0.8% when the reactive gas is 0.4 to 1.6% (based on the thickness of the coating film of 0.1 μm) when it is deposited at room temperature and 100 ° C. This result means that even if the film is scratched with a force of 40 N, the film can survive without any damage. Further, when the methane gas ratio is further increased to 1.2% at a deposition temperature of 100 ° C or lower, the critical load is decreased, while at 200 ° C, the methane ratio continues to increase, reaching from 1.6% to 32N, have. Therefore, it is understood that methane gas is preferably in the range of 0.4 to 1.6%.

The boron carbide atoms in the target are vacuum deposited on the surface that is polished or matte coated under the plasma state, which is a group of positive ions and electrons charged by the electric discharge of the incoming gases, to form a scratch resistant protective film layer. In this case, the temperature of the base material is not heated because the temperature at which the PC or ABS resin, which is the base material, is resistant to heat is about 80 ° C.

Therefore, in order to increase the quality of the film because the internal temperature of the sputtering apparatus 10 can not be raised due to the characteristics of the base material, the carbon atoms are absorbed into the aluminum (AL) material of the spray coating by the addition of the reactive gas, So that the adhesive property is improved. Since the crystallinity is formed when the temperature is increased, the surface friction coefficient is better when the amorphous phase is formed at the room temperature where the amorphous phase is formed. In order to increase the adhesion, the adhesion is improved when the reactive gas is mixed.

In the sputtering apparatus, since the substrate holder rotates and the carbon particles (C), which are statistically smaller than the boron (B) particles, are uniformly distributed in the coating film by the addition of the reactive gas and the adjustment of the applied power, A boron carbide coating layer having strong adhesion to the base material of the cellular phone case can be obtained. Further, by increasing the density of the plasma, the deposition rate of the boron carbide forming the scratch resistant boron carbide coating layer is increased, so that the coating film having a high crystallinity can be produced more rapidly.

Also, the injection of methane (CH 4) as a reaction gas is used to adjust the chemical composition of boron carbide to improve the strength, durability, adhesion and the like according to a matte or luminescent spray coating layer. In fact, even if a B4C target is used depending on the kind of the substrate material, an amorphous crystal phase (B8C, B12C, B25C, etc.) is often obtained without the B4C crystal phase having the same composition of the boron carbide deposited thereon.

If a reactive gas containing hydrocarbon such as CH 4, acetylene (C 2 H 2), or ethane (C 2 H 6) is injected while depositing the boron carbide coating layer 3 on the spray coating layer 2, Thereby obtaining a stoichiometric B4C crystal phase.

Experiments to improve the scratch resistance of the mobile phone case were made by cutting a 2 × 2 cm2 cell phone case coated with a luminous flux on the surface of a specimen, which is a base material of PC and ABS mixed resin, and depositing a boron carbide coating layer by a sputtering method.

At this time, the deposition conditions are DC power 0.5-5.5 W / cm 2, Ar flow 5 ~ 80 scm, and CH 4 flow 0.4 ~ 0.8 vol%.

As described above, the present invention has been described with reference to particular embodiments, such as specific elements, and specific embodiments and drawings. However, it should be understood that the present invention is not limited to the above- And various modifications and changes may be made thereto by those skilled in the art to which the present invention pertains.

Accordingly, the spirit of the present invention should not be construed as being limited to the embodiments described, and all of the equivalents or equivalents of the claims, as well as the following claims, belong to the scope of the present invention .

100: Cell phone case
110: Rear cover
120: liquid spraying means
111: liquid storage space
126: Switch

Claims (15)

A rear cover mounted on a rear surface of the cellular phone so that a front display portion of the cellular phone can be opened and having a liquid storage space for storing liquid therein; And
Liquid spraying means mounted on the rear cover for spraying liquid in the liquid storage space to the outside;
And a liquid ejecting function.
A rear cover mounted on a rear surface of the cellular phone so that a front display portion of the cellular phone can be opened and having a liquid storage space for storing liquid therein; And
A liquid spraying means mounted on the rear cover for spraying liquid inside;
Wherein the liquid spraying means has a liquid spraying function which is formed to spray liquid onto the rear surface of the mobile phone.
A rear cover mounted on a rear surface of the cellular phone so that a front display portion of the cellular phone can be opened and having a liquid storage space for storing liquid therein; And
A liquid spraying means mounted on the rear cover for spraying the liquid inside out, comprising: an inlet valve, an outlet valve, a valve stopper, a piston and a spring;
And a liquid ejecting function.
A rear cover mounted on a rear surface of the cellular phone so that a front display portion of the cellular phone can be opened and having a liquid storage space for storing liquid therein; And
Liquid spraying means mounted on the rear cover for spraying liquid in the liquid storage space to the outside;
Wherein the liquid spraying means has a liquid spraying function capable of sliding in a vertical direction of the rear cover and having a switch for spraying the liquid in the liquid storage space to the outside by pressurization.
A rear cover mounted on a rear surface of the cellular phone so that a front display portion of the cellular phone can be opened and having a liquid storage space for storing liquid therein; And
Liquid spraying means mounted on the rear cover for spraying liquid in the liquid storage space to the outside;
Wherein the rear cover has a liquid spraying function in which a binder of an adhesive component is applied to an opposite surface of the rear cover facing the rear surface of the mobile phone and is detachably coupled to the mobile phone.
6. The method according to any one of claims 1 to 5,
Wherein the rear cover has a liquid spraying device mounting groove portion on which the liquid spraying means is mounted.
6. The method according to any one of claims 1 to 5,
Wherein the liquid spraying means has a liquid spraying function which is inserted into the liquid storage space and inserted into the suction port to suck the liquid.
6. The method according to any one of claims 1 to 5,
Wherein the liquid spraying means is provided with a switch for spraying the liquid in the liquid storage space to the outside and a liquid spraying function connected to the switch and formed with a protruding support portion inserted and fixed into the rear cover.
6. The method according to any one of claims 1 to 5,
Wherein the rear cover is provided with a flow rate check part capable of checking the amount of liquid inside the liquid storage space.
6. The method according to any one of claims 1 to 5,
And a liquid spraying function of forming a glossy or non-glossy spray coating layer on the outer surface of the rear cover.
A rear cover mounted on a rear surface of the cellular phone so that a front display portion of the cellular phone can be opened and having a liquid storage space for storing liquid therein; And
Liquid spraying means mounted on the rear cover for spraying liquid in the liquid storage space to the outside;
Wherein the rear cover has a liquid injection function comprising a polycarbonate (PC) resin and an ABS (Acrylonitrile butadiene styrene resin) resin.
A rear cover mounted on a rear surface of the cellular phone so that a front display portion of the cellular phone can be opened and having a liquid storage space for storing liquid therein; And
Liquid spraying means mounted on the rear cover for spraying liquid in the liquid storage space to the outside;
Wherein the back cover has a liquid spraying function in which a spray coating layer is formed with a metal powder containing aluminum in a glossy or non-glossy state.
13. The method of claim 12,
Wherein the coating layer further comprises a metal powder selected from the group consisting of silver (Ag) and copper.
The method of claim 12, wherein
Wherein the coating layer is formed to a thickness of 0.2 to 0.8 占 퐉.
13. The method according to any one of claims 11 to 12,
And a liquid spraying function in which a boron carbide coating layer is further formed on the rear cover.

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