TRANSPARENT FILM HAVING IMPROVED LIGHTING PERFORMANCE, AND MANUFACTURING METHOD THEREFOR

A transparent film having improved lighting performance, and a manufacturing method therefor are disclosed. According to a preferable embodiment of the present invention, the transparent film having improved lighting performance has a plurality of transmission and refraction parts formed at predetermined intervals on the surface of a support film, a cross-section of each of the transmission and refraction parts comprises a flat part, which has a predetermined height from the planar surface of the support film, and an inclined part extended from one end of the flat part to the plane of the support film, and the flat part is bonded to a glass window by an adhesive. Sunlight directly entering through the glass window is refracted and then is directed toward the bottom surface or is reflected at the inclined part and then is directed toward the ceiling, thereby entering deeply into an indoor place, and thus lighting effects are improved. In addition, since light entering perpendicularly to the flat part is transmitted in the same direction without being refracted, an indoor person can observe an outside landscape or an outside object as is, and thus the frustration of being incapable of observing the outside when using a window blind has been solved.

TECHNICAL FIELD

The present invention relates to a transparent film and a manufacturing method thereof, and more particularly, to a transparent film having improved lighting performance and a manufacturing method thereof.

BACKGROUND ART

As the desire for quality of life increases recently, the desire to increase in natural light also increases at the same time. However, the difficulty of adjusting a room temperature due to an influx of sunlight and the difference in amount of light is remarkable in the vicinity of the window and far from the window. In addition, in the case of an office having a large window, there is a problem that a worker has a difficulty to see an LCD monitor due to the direct influx of outside sunlight when the worker is placed in the vicinity of the window, and a problem that that the outsider's eyes are not blocked additionally occurs. To solve this problem, many households and offices have been controlling the lighting by using blinds and barrier films.

However, in the case of the blinds and the barrier films, all the blinds and barrier films may not effectively use the incident natural light and generate their effects by completely blocking, partially blocking, or attenuating the sunlight. However, in this case, since an amount of light introduced into the room is reduced, electric energy is used for the lighting using room lights from the daytime. In the case of the blinds, there is a problem that people who live indoors feel uncomfortable due to the fact that gaze is blocked by 100% to make it impossible to view the scenery outside the window through the window.

DISCLOSURE OF THE INVENTION

Technical Problem

An object to be solved by the present invention is to provide a transparent film having lighting performance, in which people's gaze to a room from the outside is blocked while allowing outdoor natural light to be introduced into a depth region of an indoor place, and light transmittance to the outside in indoors is improved to solve stuffy due to invisibility of indoor residents while saving electric energy for indoor lighting, and a manufacturing method thereof.

Technical Solution

A transparent film according to a preferred embodiment of the present invention for solving the above problem includes: a support film; and a plurality of transmission and refraction parts formed on one plane of the support film and disposed at a predetermined interval to adhere to a glass window, wherein a cross-section of each of the transmission and refraction parts includes: a flat part having a predetermined height from the plane of the support film; and an inclined part extending from the flat part to the plane of the support film, wherein the flat part adheres to the glass window by an adhesive.

Also, the inclined part may extend from one end of the flat part to the plane of the support film.

Also, the inclined parts of the transmission and refraction parts may be formed in the same direction.

Also, the interval between the plurality of transmission and refraction parts may be 50% of a length of the flat part.

A transparent film according to another preferred embodiment of the present invention for solving the above problem is a transparent film, in which a plurality of flat parts and inclined parts are alternately formed on one surface thereof, wherein the plurality of inclined parts extend from one end of the flat part to the inside of the transparent film and formed in the same direction, and the flat part adheres to a glass window by an adhesive.

Also, projected lengths of the inclined parts and the flat parts may be the same.

Also, an angle between each of the inclined parts and the plane of the support film may range of 30 degrees to 60 degrees.

Also, the adhesive may be applied to the flat part.

Also, the transparent film may further include an adhesive transfer film which has one surface coated with the adhesive, of which the surface coated with the adhesive adheres to the flat part, and by which the adhesive is transferred to the flat part when being detached from the flat part.

Also, the support film may be a polyester film, and the plurality of transmission and refraction parts may be made of a UV-curable resin.

Also, the transparent film may further include an adhesion film including: a transparent support member preventing yellowing of the transmission and refraction parts; a first adhesion layer formed on one surface of the transparent support member; a second adhesion layer formed on the other surface of the transparent support member; and a protection film protecting the first adhesion layer, wherein the second adhesion layer adheres to the flat part, and the first adhesion layer adheres to the glass window by removing the protection film.

A method for manufacturing a transparent film according to a preferred embodiment of the present invention for solving the above problem includes: (a) applying a ultraviolet (UV)-curable resin to a support film; (b) forming a plurality of transmission and refraction parts, which are disposed on the UV-curable resin at a predetermined interval by using a roller, on which patterns of flat parts and inclined parts are formed, to adhere a glass window; and (c) irradiating UV rays onto the UV-curable resin to cure the UV-curable resin, wherein a cross-section of each of the plurality of transmission and refraction parts includes a flat part having a predetermined height from a plane of the support film and an inclined part extending from the flat part to the plane of the support film, and the inclined parts provided in the plurality of transmission and refraction parts extend from one cross-section of two cross-sections of the flat part to the plane of the support film and are formed in the same direction.

Also, the interval between the plurality of transmission and refraction parts may be 50% a length of the flat part.

A method for manufacturing a transparent film according to another preferred embodiment of the present invention for solving the above problem includes: (a) heating a polymethylmethacrylate (PMMA) film; (b) performing processing to alternately form a plurality of flat parts and inclined parts on a plane of the heated PMMA film by using a roller on which patterns of the flat part and the inclined part are formed; and (c) cooling the PMMA film on which the plurality of flat parts and inclined parts are alternately formed on the plane to cure the PMMA film, wherein the plurality of inclined parts extend from one cross-section of two cross-sections of the flat part to the inside of the PMMA film and are formed in the same direction.

Also, projected lengths of the inclined parts and the flat parts may be the same.

Also, an angle between each of the inclined parts and the plane of the support film may range of 30 degrees to 60 degrees.

Also, the method may further include allowing an adhesive transfer film, which has one surface coated with the adhesive, of which the surface coated with the adhesive adheres to the flat part, and by which the adhesive is transferred to the flat part when being detached from the flat part, to adhere to the flat part.

Also, the method may further include allowing a second adhesion layer of an adhesion film, which comprises: a transparent support member preventing yellowing of the transmission and refraction parts; a first adhesion layer formed on one surface of the transparent support member; the second adhesion layer formed on the other surface of the transparent support member; and a protection film protecting the first adhesion layer, to adhere to the flat part, wherein the first adhesion layer may adhere to a glass window by removing the protection film.

Advantageous Effects

In the transparent film having the improved lighting performance according to the preferred embodiment of the present invention, the plurality of transmission and refraction parts may be formed at a predetermined interval on the support film surface. The cross-section of each of the transmission and refraction parts may include the flat part having the predetermined height from the plane of the support film and the inclined part extending from the one end of the flat part to the plane of the support film. Here, the flat part may adhere to the glass window by the adhesive. In the case of sunlight that is directly incident through the glass window, since the sunlight is refracted to be directed to the floor surface or reflected by the reflection part to face the ceiling, the sunlight may be introduced up to the deep place of the room to improve the lighting effect. Also, when the light is incident to be perpendicular to the flat part, the light may be transmitted in the same direction without being refracted. Thus, the person in the room may observe the external scenery and the external objects at it is to solve the stuffiness that occurs when the person does not observe the outside due to the blind.

MODE FOR CARRYING OUT THE INVENTION

Preferred embodiments of the present invention will be described below in more detail with reference to the accompanying drawings.

FIG. 1ais a view illustrating a structure of a transparent film having improved lighting performance according to a first preferred embodiment of the present invention.

Referring toFIG. 1a, a transparent film having improved lighting performance according to a first preferred embodiment of the present invention includes a support film110and a plurality of transmission and refraction parts120disposed on one plane of the support film110and disposed at a predetermined interval to adhere to a glass window500.

The support film110may perform a function of supporting the plurality of transmission and refraction parts120so that the transmission and refraction parts120are maintained at the predetermined interval with respect to each other and may be provided as a polyester film.

Each of the transmission and refraction parts120has a cross-section including a flat part121disposed at a predetermined height from the plane of the support film110and an inclined part122extending from one end of the flat part121to the plane of the support film110. The flat part121may adhere to the glass window500by an adhesive211so that the transmission and refraction parts120are installed on the glass window500. In the preferred embodiment of the present invention, the transmission and refraction part120is made of a transparent ultraviolet-curable resin.

The inclined part122of the transmission and refraction part120extends from the one end of the flat part121to the plane of the support film110. In the preferred embodiment of the present invention, all the inclined parts122are formed in the same direction. The top and bottom of the transparent film according to the preferred embodiment of the present invention is specified. When a user purchases the transparent film of the present invention, an end of the film that is indicated as the bottom is installed to face the ground. In this case, the inclined part122may extend in a direction of the ground.

Furthermore, an angle θ defined between the inclined part122and the support film110may preferably range of 30 degrees to 60 degrees. The transparent film of the present invention may be produced as a separate film for each season. That is, the angle between the inclined part122and the support film110is differently set for each seasonal product. This is done because the altitude of the sun is changed according to the season. In the preferred embodiment of the present invention, although the angle between the inclined part122and the support film110is set to 37 degrees to 55.5 degrees, it will be appreciated by those skilled in the art that the angle applied to the actual product is set differently according to the latitude of the place at which the product is installed.

Also, it is preferable that lengths of the inclined part122and the flat part121projected to the plane of the support film110are the same. However, it is clear that the projected length of the inclined part122and the projected length of the flat part121are designed to be different from each other according to design specifications.

The transparent film according to the first preferred embodiment of the present invention is sold in a state in which an adhesive transfer film212adheres as illustrated at a right side ofFIG. 1a(seeFIG. 1a(a)). Here, the user may remove the adhesive transfer film212to attach the transparent film to the glass window500.

An adhesive211is applied to one surface of the adhesive transfer film212. The surface coated with the adhesive211adheres to the flat part121. When the user removes the adhesive transfer film212, the adhesive211applied to the one surface of the adhesive transfer film212may be transferred to the flat part121to remain on the flat part121. The user may attach the transparent film to the glass window500by using the adhesive211remaining on the flat part121.

In a modified embodiment of the first embodiment of the present invention, the adhesive film fixedly adheres to the flat part121and then is attached to the glass window500, instead of a method in which the adhesive211is transferred to the flat part121by using the adhesive transfer film212illustrated inFIG. 1ato attach the transparent film to the glass window500.

FIG. 1bis a view for explaining the structure of the transparent film according to a modified example of the first preferred embodiment of the present invention.

Referring toFIG. 1b, the transparent film according to the modified embodiment is sold in a state in which the adhesive film fixedly adheres to the flat part121.

Here, the adhesive film includes a transparent support member222, which prevents yellowing of the transmission and refraction part120, a first adhesion layer221formed on one surface of the transparent support member222, a second adhesion layer223formed on the other surface of the transparent support member222, and a protection film224protecting the first adhesion layer221. The second adhesion layer223fixedly adheres to the flat part121of the transmission and refraction part120formed on the support film110.

When the transparent and refraction part120made of an ultraviolet-curable resin is exposed to the sunlight for a long time, a yellowing phenomenon that gradually changes to a yellow color may occur. Here, the transparent support member222of the adhesive film may prevent the yellowing phenomenon from occurring. The transparent support member222may be formed through a combination of polyester (PET) and polymethylmethacrylate (PMMA) resins.

The user purchases the corresponding transparent film and then remove the protection film224to attach the first adhesion layer221to the glass window500, thereby installing the transparent film of the present invention on the glass window500.

Although the plurality of transparent and refraction parts120described with reference toFIG. 1amay contact each other, the plurality of transparent and refraction parts120may be spaced a predetermined distance from each other as illustrated inFIG. 1b. Here, the spaced distance may preferably range of 0 to the length of the plane of the flat part121(or the inclined part122). As the spaced distance decreases more and more, the transparent and refraction parts120may have a cross-sectional shape in which the transparent and refraction parts120contact each other. However, the example illustrated inFIG. 1billustrates an example in which the distances of the planes of the flat part121and the inclined part122are the same, and 50% of the distance of the plane is set to the spaced distance. The spaced distance may be set to be larger according to the design specifications.

FIG. 2is a process view for explaining a method for manufacturing the transparent film having the improved lighting performance according to the first preferred embodiment of the present invention.

The method for manufacturing the transparent film according to the first preferred embodiment of the present invention will be described with reference toFIG. 2. First, the UV-curable resin is applied to the support film110(seeFIG. 2(a)). The polyester film may be applied as the support film110as described above.

Thereafter, a roller600on which patterns of the flat part121and the inclined part122are formed rotates to allow the support film110to pass therethrough, thereby forming the patterns of the surface of the roller600on the UV-curable resin (seeFIG. 2(b)). The plurality of transparent and refraction parts120, which are disposed at a predetermined interval to adhere to the glass window500, are formed on the UV-curable resin by the roller600.

When the transparent and refraction parts120are formed at the predetermined interval, ultraviolet rays are irradiated onto the transparent and refraction parts120to cure the transparent and refraction parts120(seeFIG. 12(c)).

When the transmission and refraction parts120formed on the support film110are cured, the adhesive transfer film212, which are previously prepared, adheres to the support film110on which the transmission and refraction parts120are formed so that the adhesive211is transferred to the flat part121of each of the transmission and refraction parts120(seeFIG. 2(d)). As illustrated inFIG. 2 (d), the transparent film of the present invention is sold in the state in which the adhesive transfer film212and the support film110, on which the transmission and refraction parts120are formed, adhere to each other. In order to prevent the adhesive211from being cured, the transparent film may be sold in a sealed state.

Thereafter, when the user needs to use the transparent film of the present invention after purchasing the transparent film, if the adhesive transfer film212is detached as illustrated inFIG. 2(e), the adhesive211applied to the adhesive transfer film212may remain on the transmission and refraction parts120. Thus, the user may attach the corresponding surface to the glass window500to install the transparent film of the present invention to the glass window500.

The transparent film according to the first preferred embodiment of the present invention has been described.

FIG. 3is a view illustrating a structure of a transparent film having improved lighting performance according to a second preferred embodiment of the present invention.

In the case of the first embodiment, the transmission and refraction parts120are formed on the support film110by using the UV-curable resin. However, a transparent film according to a second preferred embodiment of the present invention is different from the transparent film according to the first embodiment in that the transparent film is integrally formed by using a PMMA film310.

Referring toFIG. 3, the transparent film according to the second embodiment has one surface on which a plurality of flat parts311and inclined parts312are alternately formed. Each of the plurality of inclined parts312extends from one end of each of the flat parts311to the inside of the transparent film. Thus, the plurality of inclined parts312are formed in the same direction. Also, the flat part311may be a surface that adheres to a glass window500by an adhesive211. Like the first embodiment, it is preferable that the flat part311has substantially the same length as a projected length on a plane of the inclined part312. However, this may be changed according to design specifications.

The transparent film according to the second embodiment is generally the same as that according to the first embodiment except that the transparent film is integrally formed. For example, an angle θ defined by the inclined surface and the horizontal plane of the transparent film may preferably range of 30 degrees to 60 degrees. However, the angle may be changed according to the latitude of the installed position of the transparent film.

Also, the transparent film according to the second embodiment may be sold in a state of adhering to an adhesive transfer film212(seeFIG. 3(a)). When the user removes the adhesive transfer film212so as to install the transparent film on a glass window500, the adhesive211may remain on the flat part311. Then, when the transparent film is attached so that the flat part311faces the glass window500, the transparent film may be installed on the glass window500by the adhesive211(seeFIG. 3(b)).

FIG. 4is a process view for explaining a method for manufacturing the transparent film having the improved lighting performance according to the second preferred embodiment of the present invention.

A method for manufacturing the transparent film having improved lighting performance according to the second preferred embodiment of the present invention will be described with reference toFIG. 4. First, as illustrated inFIG. 4(a), the PMMA film310is prepared and then heated by a heating unit to make it possible to form a pattern.

Thereafter, a roller600on which patterns of the flat part311and the inclined part312are formed rotates to allow the heated PMMA film310to pass therethrough, thereby forming the patterns of a surface of the roller600on a surface of the PMMA film310(seeFIG. 4(b)). The patterns of the flat part311and the inclined part312are alternately formed on the PMMA film310by the roller600.

When the flat part311and the inclined part312are formed on the PMMA film310, the flat part311and the inclined part are cooled by using a cooling unit to cure the patterns of the flat part311and the inclined part312, which are formed on the surface of the PMMA film310, as it is (seeFIG. 4(c)). When the patterns are cured, an adhesive transfer film212, on which an adhesive211is applied, adheres to the transparent film310made of a PMMA material to complete a product (seeFIG. 4(d)).

FIG. 5is a view illustrating a path of light when the transparent film according to the preferred embodiment of the present invention is installed.

Referring toFIG. 5, light, which is obliquely incident into the flat part121, of light incident into the transparent film is expressed as reference numeral501. The light is primarily refracted by the flat part121and then refracted again by the surface of the support film110so as to be directed to a floor surface.

Furthermore, light incident into a surface perpendicular to the flat part121is expressed as reference numeral502. The light is totally reflected by the inclined part122so as to be directed to a ceiling in an indoor place.

Also, in the case of the light that is incident to be perpendicular to the flat part121, the light is expressed as reference numeral503. The light is directed in the incident direction without being refracted. Thus, the person located in the indoor place may directly recognize an external object as it is in a front direction through the transparent film.

As illustrated inFIG. 5, in the case of the sunlight that is directly incident through the glass window500, the light is refracted to be directed to the floor surface or the ceiling. Thus, since the sunlight is introduced up to the deep place of the indoor place, a lighting effect may be improved.

In addition, in the case of the light incident to be perpendicular to the flat part121, the light may be transmitted in the same direction without being refracted. Thus, the person in the room may observe the external scenery and the external objects at it is to solve the stuffiness that occurs when the person can not observe the outside due to the blind.