Abstract:
The invention provides an electronic device housing with solar paint and a manufacturing method thereof. Solar-powered paint layers are transferred onto the housing by the IMD technology. Therefore, the housing of the electronic device can generate electric energy via solar power to prolong the operation time of the electronic device and achieve environmental protection and energy conservation effects.

Description:
BACKGROUND OF THE INVENTION 
     1. Field of Invention 
     The invention relates to an electronic device housing and, more particularly, to an electronic device housing with solar paint. 
     2. Related Art 
     As oil energy crisis and abnormality and deterioration of the climate become more and more serious, people begin to avoid their over-reliance on natural energy. People also change their ideas about misunderstanding that natural resources are inexhaustible, and increasingly pay attention to environmental protection and energy conservation. Consequently, many companies gradually trend to develop and utilize the so-called green energy. 
     For the green energy, the ones most easily to be obtained are wind power and solar power. The wind power is generated as long as climate changes. The solar power exits in any place with sunshine. If the green energy can be utilized, damage caused by other polluting energy to the earth may be decreased. Furthermore, the green energy almost may be regarded as exhaustless energy. 
     However, an application of wind power needs to utilize large blades blown by the wind power to drive a generator to generate and supply energy. The equipment is usually very huge, and the place with enough wind power is also rather limited. Therefore, the application of wind power is narrow and hardly applied at a general electronic device. Consequently, the solar power becomes the quite hot alternative energy presently. 
     A solar chip is cut according to a current determined in a design, and it is soldered with foil wires. Then, soldered chips are connected in series to be a group via the foil. Afterward, the group and a protection material such as EVA (Ethylene vinyl acetate), tedlar, and low-iron toughened glass are put in a laminator to be vacuum encapsulated to be a solar panel as a module. However, the solar panel is expensive, occupies space, and provides low efficiency. Therefore, it is difficult to widely apply the solar panel in the general electronic device. Recent years, Berkeley University in the US publishes a product called solar paint. The solar paint is directly coated on an outer wall to absorb the solar power and replace the solar panel. However, this paint is still at an undeveloped stage, and how to apply the paint in a practical electronic device still may be improved considerably. 
     SUMMARY OF THE INVENTION 
     According to a method for manufacturing an electronic device housing with solar paint, a film is provided, and a solar-powered paint layer is formed on the film. The film with the solar-powered paint layer is placed in a mold, and the housing is formed in a mode such as in-mold decoration (IMD) and is combined with the film. The solar-powered paint layer on the film is thus combined with the housing. The film is removed to make the solar-powered paint layer disposed on a surface of the housing. The solar paint may be effectively applied in products largely via the IMD technology. 
     On the other hand, an electronic device housing with solar paint according to the invention includes a housing, an adhesive layer, and a solar-powered paint layer. The solar-powered paint layer and the adhesive layer are pre-formed on a film. Then, the solar paint layer is transferred onto the housing via the IMD technology. The solar-powered paint layer may be transparent or colorful, and it may form a special pattern and be disposed on a surface of the housing. Thus, it can absorb solar power to generate electric energy to prolong the operation time of the electronic device, and further to achieve environmental protection and energy conservation effects. 
     These and other features, aspects and advantages of the present invention will become better understood with regard to the following description, appended claims, and accompanying drawings. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1A  to  FIG. 1E  are schematic diagrams showing a patterned film of an electronic device housing with solar paint and a manufacturing method thereof according to an embodiment of the invention; 
         FIG. 2A  to  FIG. 2C  are schematic diagrams showing the IMD of an electronic device housing with solar paint and a manufacturing method thereof according to an embodiment of the invention; 
         FIG. 3  is a schematic diagram showing an electronic device housing with solar paint formed a pattern layer and a manufacturing method thereof according to an embodiment of the invention; and 
         FIG. 4  is a schematic diagram showing an electronic device housing with solar paint and a manufacturing method thereof according to another embodiment of the invention. 
     
    
    
     DETAILED DESCRIPTION OF THE INVENTION 
     According to an electronic device housing with solar paint and a manufacturing method thereof of the invention, solar paint is transferred to the housing via the in-mold decoration (IMD). The IMD is divided into in-mold rolling (IMR), in-mold forming (IMF), and in-mold label (IML) according to its application range. 
     The electronic device housing with the solar paint and the manufacturing method thereof in an embodiment of the invention are illustrated with the most common IMR. First, as shown in  FIG. 1A , a film  10  is provided. The film  10  is usually composed of polyester (PET). Second, as shown in  FIG. 1B , a stripping layer  20  is formed on the film  10 . Third, as shown in  FIG. 1C , a hardened layer  21  is formed on the stripping layer  20  to protect a pattern to be formed afterward. Fourth, as shown in  FIG. 1D , a solar-powered paint layer  30  is formed on the hardened layer  21 . The solar-powered paint layer  30  includes carbon nano tubes and carbon fullerene, and it is energy-storage material made by mixing at least two kinds of paint. The energy-storage material can absorb light with different wavelengths, and it is taken as a coating material to replace a conventional solar panel. The carbon fullerene is a micro-nano-particle composed of sixty carbon atoms, and it also may be called buckminsterfullerene, fullerene, or buckyball. 
     The solar-powered paint layer  30  may be combined with the stripping layer  20  on the film  10  via screen printing, gravure printing, or relief printing. As a result, the solar-powered paint layer  30  may be colorless and transparent, and it also may form different kinds of colors mixed together to present the color with the pattern. As shown in  FIG. 1E , a process of producing a patterned film is finished after an adhesive layer  40  is disposed on the solar-powered paint layer  30 . 
     As shown in  FIG. 2A , the finished film  10  which is the film  10  orderly combined with the stripping layer  20 , the solar-powered paint layer  30 , and the adhesive layer  40  is put in a mold  90 . As shown in  FIG. 2B , the injection molding technology is utilized to form the housing  50  in the mold  90  and combine the housing  50  with the film  10 . The housing  50  and the film  10  are combined using the adhesive layer  40 . The film  10  and the solar-powered paint layer  30  are easily to be combined and fixed with the housing  50  via the adhesive layer  40 . Then, the film  10  is removed to form the housing (as shown in  FIG. 2C ). Since the stripping layer  20  is formed between the film  10  and the solar-powered paint layer  30 , the film  10  together with the stripping layer  20  may be easily removed without affecting the solar-powered paint layer  30 . Besides the IMD, the solar paint  30  may be combined with the housing  50  in a transfer mode such as heat transfer and water transfer. 
     At the time, the hardened layer  21  may be used as a protection layer for the solar-powered paint layer  30  to prevent the solar-powered paint layer  30  from being detached and abraded after a long term use. On the other hand, since the solar-powered paint layer  30  needs to absorb sunshine to be acted, the hardened layer  21  needs to be a transparent layer or a translucent layer allowing the light to penetrate to provide enough light to pass through. 
     As a result, the solar-powered paint layer  30  may be easily attached to the housing  50 . When the housing  50  is used at the electronic device, the solar power is absorbed via the solar-powered paint layer  30 , and it is converted into electric energy needed in the operation of the electronic device. Since the conversion procedure and structures are conventional technology which may be easily achieved by persons having ordinary skill in the art, they are not described herein for a concise purpose. 
     The solar-powered paint layer  30  may be a blending color with a special pattern, and it may replace a conventional pattern layer. It also may be colorless and transparent without affecting the existing pattern layer  60  (as shown in  FIG. 3 ). As a result, the solar paint may be smoothly commercialized to be effectively applied in products and mass-produced via the IMD technology. 
     Beside the IMR shown in  FIG. 2A  to  FIG. 2C , the IML and the IMF also may be used. As shown in  FIG. 4 , since the film  10  does not need to be removed in the IML and the IMF, the stripping layer  20  and the hardened layer  21  are not disposed. Additionally, the film  10  is molded under high pressure before it is disposed in the mold  90  to form the pattern with two-dimensional (2D) curves (IML) or the pattern with three-dimensional (3D) curves (IMF). 
     Although the present invention has been described in considerable detail with reference to certain preferred embodiments thereof, the disclosure is not for limiting the scope of the invention. Persons having ordinary skill in the art may make various modifications and changes without departing from the scope and spirit of the invention. Therefore, the scope of the appended claims should not be limited to the description of the preferred embodiments described above.