Abstract:
An electromagnetic wave shielding layer structure is mainly comprised of transparent substrate and mesh, wherein the transparent substrate has first face and second face, and the mesh also has first face and second face, and wherein the second face of mesh is pasted upon the first face of transparent substrate; particularly, the first face of mesh has a pressure sensitive adhesive with an appropriate thickness to replace the ultraviolet (UV) transparency processing adhesive.

Description:
FIELD OF THE INVENTION  
         [0001]    The invention relates to an electromagnetic wave shielding layer structure, and in particular, to an electromagnetic wave shielding layer structure that replaces UV transparency processing adhesive with pressure sensitive adhesive.  
         BACKGROUND OF THE INVENTION  
         [0002]    Plasma TV is mainly comprised of a piece of plasma display panel (abbreviated as PDP), which applies inert gases, that is, plasma (e.g., mixture of Neon gas and Xenon gas) that is sealed between two pieces of glass plates. When electronic discharge is created from outside electric field, the ultraviolet rays converted from the energy, of inert gas, created from electronic discharge will excite fluorescent powders, of red, blue, and green colors, coated upon the glass plates to emit light through front glass and visible by human eyes, so these emitted visible lights construct the colorful pictures viewed by the user.  
           [0003]    General speaking, when the user is watching plasma TV, in order to make him feel natural and comfortable in facing the light emitted from plasma TV and to avoid the radiation of electromagnetic wave, a piece of filter is usually arranged in front of plasma display panel disposed in the plasma TV.  
           [0004]    Basically, this filter is mainly comprised of electromagnetic wave shielding layer (EMI), color compensating layer, anti-reflecting layer (AR), and glass layer, etc., each of which has its specific function. For example, after the light enters the filter, the metal mesh of electromagnetic wave shielding layer will remove the radiation of electromagnetic wave carried by the light, and the light will also make spectrum calibration for itself by the dye in color compensating layer. As for the glass layer, its main function is to enforce the structure of entire piece of filter. Furthermore, when outside light (ultraviolet ray) is incident upon the filter facing the user, the outside light will be reflected into the user&#39;s eyes to make him dizzy, so the anti-reflecting layer is designed to prevent this situation happening. So, when the user is facing the colorful pictures shown by the light that is emitted from the front glass of plasma TV, he will feel natural and comfortable without the threat of electromagnetic wave radiation.  
           [0005]    Aiming at this electromagnetic wave shielding layer, the inventor proposes this invention. The prior electromagnetic wave shielding layer is very complicated, and the process for manufacturing the structure of electromagnetic wave shielding layer is divided into two parts of major body and surface layer. Please refer to FIG. 1A, which shows the structure of major body that is the first manufactured part of prior electromagnetic wave shielding layer. Since this major body structure is designed to filter out the electromagnetic wave carried by the light itself by the mesh  110 , so the mesh  110  is first pasted upon a transparent glass substrate  120  (usually made of Polyethylene Terephthalate, abbreviated as PET). However, the mesh  110  is a layer structure woven complicatedly so, in considering that, when light passes through the mesh  110 , the mesh  110  will greatly reduce the penetrating possibility of light to cause the transmittance of light to be insufficient during passing through this mesh  110 . Since the transmittance of frosted glass will be increased after the frosted glass soaks water so, by this principle, the mesh  150  is coated with a layer of UV transparency processing adhesive to expect that the transmittance will be increased when the light passes through the mesh  110 . Later on, considering the adhesion ability of UV transparency processing adhesive layer  140  and the protection of UV transparency processing adhesive  140  before its combination with the surface structure of electromagnetic wave shielding layer, a piece of transparent glass substrate  130  is pasted upon the UV transparency processing adhesive  140 .  
           [0006]    After the major body structure  105  of the electromagnetic wave shielding layer is completed, the manufacturing process of the surface layer structure of electromagnetic wave shielding layer is started next. Except for protecting the major body structure  105 , this surface layer structure must also have the characteristic of easy removal, such that it is easy for the major body structure of electromagnetic wave shielding layer to be combined with other layers in the filter. Please refer to FIG. 1B, which shows a simple illustration for the combination between the major body structure and the surface layer structure of the electromagnetic wave shielding layer. After the major body structure  105  is completed, the arrangement of the surface layer structure  145  is that, by pressure sensitive adhesives  150 ,  160  and in pressure sensitive adhesive manner, the mold-releasing films  170 ,  180  are respectively pasted upon the outer surfaces  143 ,  117 , of transparent glass substrates  120 ,  140  in the major body structure  105 , corresponding to other layers of pasting faces, such that the major body structure  105  is protected. The match-up between the mold-releasing films  170 ,  180  and the pressure sensitive adhesives  150 ,  160  will make it easy to remove the mold-releasing films  170 ,  180  from the major body structure  105 . At last, after the combination of major body structure  105  and surface layer structure  145 , a complete electromagnetic wave shielding layer structure  100  is constructed.  
           [0007]    The prior electromagnetic wave shielding layer structure and manufacturing manner have following shortcomings:  
           [0008]    1. Since there are too many structural layers in the prior electromagnetic wave shielding layer, so the transmittance of light to pass through the prior electromagnetic wave shielding layer is poor.  
           [0009]    2. Since there are too many structural layers in the prior electromagnetic wave shielding layer, so the electromagnetic wave shielding layer is too thick and its cost is relatively high.  
           [0010]    3. Since the manufacturing process for the prior electromagnetic wave shielding layer is divided into two structure parts to manufacture separately, so its manufacturing efficiency is poor.  
           [0011]    4. Since the manufacturing process for the prior electromagnetic wave shielding layer is divided into two structural parts to manufacture separately so, when the electromagnetic wave shielding layer responding to the match-up of other layers in the filter, the improvement of electromagnetic wave shielding layer structure will be involved with the manufacture of its two parts, such that it is uneasy to improve the structure of this electromagnetic wave shielding layer.  
           [0012]    Accordingly, the invention proposes an electromagnetic wave shielding layer structure and manufacturing method, which may simplify the number of structural layer, such that its cost may be lowered down and its producing efficiency will be increased.  
         SUMMARY OF THE INVENTION  
         [0013]    The main objective of the invention is to provide an electromagnetic wave shielding layer structure, which mainly includes transparent substrate and mesh. Wherein, the transparent substrate has first face and second face, and the mesh also has first face and second face. The second face of mesh is pasted with the first face of transparent substrate. Particularly, there is a pressure sensitive adhesive having an appropriate thickness upon the first face of mesh.  
           [0014]    In the preferable embodiment according to the invention, for protecting the pressure sensitive adhesive on the surface of mesh from outside damage, a piece of mold-releasing film is disposed upon the surface of pressure sensitive adhesive layer corresponding to the pasting face between the pressure sensitive adhesive layer and the mesh.  
           [0015]    For protecting the surface of transparent substrate corresponding to the pasting face between the transparent substrate and the mesh from scratching during transportation, a layer of mold-releasing film is also disposed upon this surface of transparent substrate. To make this surface of transparent substrate be smoothly pasted upon and removed from the mold-releasing film, a layer of pressure sensitive adhesive is disposed between this surface of transparent substrate and the mold-releasing film to press and adhere both together.  
           [0016]    The secondary objective of the invention is to provide a manufacturing method for electromagnetic wave shielding layer. This method includes the step to paste mesh upon the surface of transparent substrate and to coat a layer of pressure sensitive adhesive having appropriate thickness upon the mesh&#39;s surface corresponding to the pasting face between the mesh and the transparent substrate.  
           [0017]    In the preferable embodiment according to the invention, this manufacturing method for electromagnetic wave shielding layer further includes the step to paste a piece of mold-releasing film on the surface of pressure sensitive adhesive layer corresponding to the pasting face between the pressure sensitive adhesive layer and the mesh.  
           [0018]    In the preferable embodiment according to the invention, this manufacturing method for electromagnetic wave shielding layer further includes the step to paste another piece of mold-releasing film on the surface of transparent substrate corresponding to the pasting face between the transparent substrate and the mesh.  
           [0019]    Additionally, in the preferable embodiment according to the invention, this manufacturing method for electromagnetic wave shielding layer further includes a pasting step for another piece of mold-releasing film and the transparent substrate. The step is that a layer of pressure sensitive adhesive is coated between the pasting face of another piece of mold-releasing film and transparent substrate to smoothly press and paste both together.  
           [0020]    In summarizing aforementioned description, the invention proposes an electromagnetic wave shielding layer structure and manufacturing method, wherein a pressure sensitive adhesive having an appropriate thickness is coated upon mesh to replace the prior UV transparency processing adhesive, such that the structure and manufacturing method of an electromagnetic wave shielding layer structure are simplified, the manufacturing cost is lowered down, and the production efficiency is increased. 
       
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS  
       [0021]    In order to make your esteemed members of reviewing committee further recognize and understand the characteristics, objectives, and functions of the present invention, a detailed description in accordance with corresponding drawings are presented as follows.  
         [0022]    [0022]FIG. 1A shows the major body structure manufactured first of prior electromagnetic wave shielding layer.  
         [0023]    [0023]FIG. 1B shows a simple illustration for the combination between the major body structure and the surface layer structure of the electromagnetic wave shielding layer.  
         [0024]    [0024]FIG. 2 shows a simple illustration for the major body structure of the electromagnetic wave shielding layer of the preferable embodiment according to the invention.  
         [0025]    [0025]FIG. 3 shows a simple illustration for the complete structure of an electromagnetic wave shielding layer of the preferable embodiment according to the invention.  
         [0026]    [0026]FIG. 4 shows a table for comparing the structures and optical properties between the electromagnetic wave shielding layer structure according to the preferable embodiment of the invention and the electromagnetic wave shielding layer structure according to prior arts. 
     
    
     DETAILED DESCRIPTION OF THE INVENTION  
       [0027]    The prior electromagnetic wave shielding layer structure has too many layers and is divided into two parts during manufacturing process, such that the prior electromagnetic wave shielding layer structure has many shortcomings: the thickness is increased, the transmittance is lowered down, the improvement and design are difficult, and the consuming cost is higher, etc. Therefore, the invention applies pressure sensitive adhesive to replace UV transparency processing adhesive, because the pressure sensitive adhesive itself is transparent and has same function as UV transparency processing adhesive, that is, it has the characteristic to increase the transmittance of mesh. If the pressure sensitive adhesive replaces the UV transparency process adhesive, then the structure of electromagnetic wave shielding layer is simplified, the production procedure is relatively simplified, and it is unnecessary to divide the electromagnetic wave shielding layer structure into two parts to manufacture.  
         [0028]    Accordingly, in the electromagnetic wave shielding layer structure of a preferable embodiment according to the present invention, a layer of pressure sensitive adhesive is directly coated upon the surface of mesh corresponding to pasting face between the mesh and the transparent substrate. Please refer to FIG. 2, which shows a simple illustration for the major body structure of the electromagnetic wave shielding layer of the preferable embodiment according to the invention. In this electromagnetic wave shielding layer  200 , its major body structure is mainly comprised of: transparent substrate  210  (its made materials may be triacetate or polyethylene terephthalate; abbreviated as TAC or PET), mesh  220  positioned above the surface of transparent substrate  210 , and a layer of pressure sensitive adhesive  230  that has X thickness and is coated upon the surface of mesh  220  corresponding to the pasting face between the mesh  220  and the transparent substrate  215 .  
         [0029]    To prove that the pressure sensitive adhesive  230  coated upon the surface  225  of mesh  220  may really replace the UV transparency processing adhesive applied in prior electromagnetic wave shielding layer structure, the invention makes an optical experiment on the electromagnetic wave shielding layer  200  according to a preferable embodiment of the invention. In the experiment, when the thickness X of the pressure sensitive adhesive  230  reaches a specific value, the pressure sensitive adhesive  230  has the same function as that of UV transparency processing adhesive layer and may increase the transmittance of the mesh.  
         [0030]    Therefore, it is expected that the pressure sensitive adhesive  230  coated upon the surface  225  of the mesh  220  may indeed replace the prior UV transparency processing adhesive and may be acted as materials for improving the transmittance of the mesh  220  in the electromagnetic wave shielding layer  200 .  
         [0031]    When the major body structure of the electromagnetic wave shielding layer is simplified as shown in FIG. 2, the manufacturing procedure of the surface layer of the electromagnetic wave shielding layer  200  may also be simplified. Please refer to FIG. 3, which shows a simple illustration for the complete structure of an electromagnetic wave shielding layer of the preferable embodiment according to the invention. When the surface  225  of the mesh  220  is coated with pressure sensitive adhesive  230 , the electromagnetic wave shielding layer structure may be formed by directly pressing a mold-releasing film  310  upon the surface  235  of the pressure sensitive adhesive  230  corresponding to the surface  225 . After coating a layer of pressure sensitive adhesive  320  upon the surface  305  of the transparent substrate  210  corresponding to the pasting face  215 , the mold-releasing film  330  is pressed upon. After the mold-releasing films  310 ,  330  are added to the major body structure  105 , a complete electromagnetic wave shielding layer structure  300  is formed.  
         [0032]    If the complete electromagnetic wave shielding layer  300  structure according to the preferable embodiment of the invention is compared to the electromagnetic wave shielding layer  100  structure according to the prior arts, it may find that, under the situations of simplified structural layer and manufacturing process, the electromagnetic wave shielding layer  300  according to the preferable embodiment of the invention still has the same optical properties as and the better transmittance than those of the electromagnetic wave shielding layer  100  structure according to prior arts.  
         [0033]    Please refer to FIG. 4, which shows a table for comparing the structures and optical properties between the electromagnetic wave shielding layer structure according to the preferable embodiment of the invention and the electromagnetic wave shielding layer structure according to prior arts. In FIG. 4, after a layer of UV transparency processing adhesive and a layer of transparent substrate according to prior arts are removed, the optical properties of the invention is not worse than those of the prior arts, such as: the L value, a value, b value, and resistance value, etc., which are all same for both cases. As for transmittance (T %), the preferable embodiment according to the invention is better than the prior arts by 2˜3%. Therefore, under the situations of simplified structural layer and manufacturing process, the electromagnetic wave shielding layer  300  according to the preferable embodiment of the invention still has the same optical properties as and the better transmittance than those of the electromagnetic wave shielding layer  100  structure according to prior arts.  
         [0034]    The invention has following advantages:  
         [0035]    1. Since the invention has removed a layer of UV transparency processing adhesive and a layer of transparent substrate from the prior arts so, not only the thickness of structure itself is thinned (70˜80 micrometers thinner), but also the materials, the manufacturing steps, and the cost of these two layers are saved.  
         [0036]    2. The invention applies pressure sensitive adhesive to replace UV transparency processing adhesive, so those familiar with such arts should know that, because of the material characteristic of pressure sensitive adhesive itself, the pressure supporting degree of entire electromagnetic wave shielding layer is promoted.  
         [0037]    3. The invention is a layer of structure often used in filter so, when the invention is applied in the eye-protecting glasses of plasma TV, the thickness of plasma TV may be reduced and the cost of plasma TV may also be lowered down.  
         [0038]    In summary, the invention proposes an electromagnetic wave shielding layer structure and manufacturing method, which coats pressure sensitive adhesive layer having an appropriate thickness upon the mesh to replace the UV transparency processing adhesive according to prior arts, such that the structure and the manufacturing method of the electromagnetic wave shielding layer is simplified, the manufacturing cost is lowered down, and the production efficiency is increased.  
         [0039]    However, aforementioned description is only preferable embodiment according to the present invention and is not any limitation constrained upon the scope of the invention. Any equivalent variation and modification made according to the claims of the invention are still not departed from the merits of the invention, and are also within the spirit and scope of the invention, so they are all regarded as further executable situations of the invention.