ENHANCED BLIND COVER AND METHOD FOR FABRICATING THE SAME

An enhanced blind cover and a method for fabricating the same is disclosed. Firstly, a cover having at least one blind hole is provided. Then, liquidized protection glue is formed on an inner sidewall and an inner bottom surface of the blind hole. Finally, the liquidized protection glue is solidified to form solidified protection glue.

This application claims priority for China patent application no. 201510768301.3 filed on Nov. 11, 2015, the content of which is incorporated by reference in its entirely.

BACKGROUND OF THE INVENTION

Field of the Invention

The present invention relates to a cover fabrication technology, particularly to an enhanced blind cover and a method for fabricating the same.

Description of the Related Art

With technological advancements, hand-held electronic devices such as smart phones or tablet computers have widely applied to daily life. Although the hand-held electronic devices are more and more popular, the hand-held electronic devices have the opportunity to drop to the ground compared with desk-top computers. As a result, the hardness of the external cover of the hand-held electronic device becomes very important. If the hardness is not insufficient, the external cover will break to affect its appearance when the hand-held electronic device drops to the ground.

In the traditional technology, a touch module is composed of a sensor glass, a cover glass and a sensing circuit between them. In general, the cover glass has blind holes. The blind hole is inserted with a fixed pillar to combine with other elements. In order to improve the hardness of the cover glass, an enhanced fabrication process is performed on the cover glass one time whereby compression stress of the surface of the cover glass increases. For example, after the glass is heated to softening temperature, the glass cools down rapidly so that the surface of the glass is compressed to improve its hardness. This is because the compression stress of the glass surface and a central layer of the glass are balanced to form sufficient tension. However, even if the enhanced fabrication process is performed, broken points appear on the edge of the blind holes. Thus, the hardness of the cover glass is not sufficient and the cover glass is not used.

To overcome the abovementioned problems, the present invention provides an enhanced blind cover and a method for fabricating the same, so as to solve the afore-mentioned problems of the prior art.

SUMMARY OF THE INVENTION

A primary objective of the present invention is to provide an enhanced blind cover and a method for fabricating the same, which forms solidified protection glue on an inner sidewall and an inner bottom surface of the blind hole of a cover, thereby improving hardness of the blind hole.

To achieve the abovementioned objectives, the present invention provides an enhanced blind cover, which comprises a cover and solidified protection glue. The cover has at least one blind hole. The solidified protection glue is arranged on an inner sidewall and an inner bottom surface of the blind hole.

The present invention also provides a method for fabricating an enhanced cover. Firstly, a cover having at least one blind hole is provided. Then, liquidized protection glue is formed on an inner sidewall and an inner bottom surface of the blind hole. Finally, the liquidized protection glue is solidified to form solidified protection glue.

DETAILED DESCRIPTION OF THE INVENTION

The first embodiment of the present invention is introduced as below. Refer toFIG. 1andFIG. 2. The enhanced cover of the present invention comprises a cover12and solidified protection glue14, wherein the cover12has at least one blind hole10. The solidified protection glue14is arranged on an inner sidewall and an inner bottom surface of the blind hole10. For design, the solidified protection glue14arranged on the inner sidewall and the inner bottom surface of the blind hole10has a thickness dl of larger than 0 μm and less than 50 μm. Besides, the cover12comprises glass, polymethylmethacrylate (PMMA), plastic, or sapphire, wherein the plastic is exemplified by poly(ether sulfones), polyethylene terephthalate or poly naphthalene two formic acid glycol ester. The solidified protection glue comprises resin and is colorful. For water adsorption, the solidified protection glue14has water adsorption of less than 1% at 25° C. in one day. For humidity, the solidified protection glue14has humidity of less than 100 g/m2in one day. For hardness, the solidified protection glue14has pencil hardness of larger than 450 g in one day. For thermal endurance, the solidified protection glue14has thermal endurance of larger than 200° C. in one day. Since the edge of the blind hole10is easily-broken positions, the solidified protection glue14is coated on the inner sidewall and the inner bottom surface of the blind hole10to effectively improve hardness of the blind hole10lest the blind hole10break.

The fabrication process of the first embodiment of the present invention is introduced as below. Refer toFIGS. 3(a)-3(d). Firstly, as shown inFIG. 3(a), a cover plate16is provided, wherein the cover plate16comprises glass, polymethylmethacrylate, plastic, or sapphire, and the plastic can be poly(ether sulfones), polyethylene terephthalate or poly naphthalene two formic acid glycol ester. Then, as shown inFIG. 3(b), the blind hole10is formed in the cover plate16using an etching method or a polishing method, thereby forming the cover12. The material of the cover plate16is the same to that of the cover12. Then, as shown inFIG. 3(c), liquidized protection glue18is formed on the inner sidewall and the inner bottom surface of the blind hole10using a spray coating method or a dispenser coating method. The liquidized protection glue18comprises resin. Finally, as shown inFIG. 3(d), the liquidized protection glue18is solidified to form the solidified protection glue14by irradiating ultraviolet light or high-temperature treatment. In the first embodiment, the present invention is exemplified by irradiating ultraviolet light.

In addition, the steps ofFIGS. 3(a)-3(b)are replaced with a step of directly providing the cover12having the blind hole10to simplify the fabrication process, as shown inFIG. 3(b).

The second embodiment of the present invention is introduced as below. Refer toFIG. 4andFIG. 5. The enhanced cover of the present invention comprises a cover12and solidified protection glue14, wherein the cover12has at least one blind hole10. The solidified protection glue14is arranged on an inner sidewall and an inner bottom surface of the blind hole10whereby the blind hole10is filled with the solidified protection glue14. Besides, the cover12comprises glass, polymethylmethacrylate (PMMA), plastic, or sapphire, wherein the plastic is exemplified by poly(ether sulfones), polyethylene terephthalate or poly naphthalene two formic acid glycol ester. The solidified protection glue comprises resin and is colorful. For water adsorption, the solidified protection glue14has water adsorption of less than 1% at 25□ in one day. For humidity, the solidified protection glue14has humidity of less than 100 g/m2in one day. For hardness, the solidified protection glue14has pencil hardness of larger than 450 g in one day. For thermal endurance, the solidified protection glue14has thermal endurance of larger than 200° C. in one day. Since the edge of the blind hole10is easily-broken positions, the solidified protection glue14is coated on the inner sidewall and the inner bottom surface of the blind hole10to effectively improve hardness of the blind hole10lest the blind hole10break.

The fabrication process of the second embodiment of the present invention is introduced as below. Refer toFIGS. 6(a)-6(d). Firstly, as shown inFIG. 6(a), a cover plate16is provided, wherein the cover plate16comprises glass, polymethylmethacrylate, plastic, or sapphire, and the plastic can be poly(ether sulfones), polyethylene terephthalate or poly naphthalene two formic acid glycol ester. Then, as shown inFIG. 6(b), the blind hole10is formed in the cover plate16using an etching method or a polishing method, thereby forming the cover12. The material of the cover plate16is the same to that of the cover12. Then, as shown inFIG. 6(c), liquidized protection glue18is formed on the inner sidewall and the inner bottom surface of the blind hole10using a spray coating method or a dispenser coating method, whereby the blind hole10is filled with the liquidized protection glue18. The liquidized protection glue18comprises resin. Finally, as shown inFIG. 6(d), the liquidized protection glue18is solidified to form the solidified protection glue14by irradiating ultraviolet light or high-temperature treatment. In the second embodiment, the present invention is exemplified by irradiating ultraviolet light.

In addition, the steps ofFIGS. 6(a)-6(b)are replaced with a step of directly providing the cover12having the blind hole10to simplify the fabrication process, as shown inFIG. 6(b).

The third embodiment of the present invention is introduced as below. Refer toFIG. 7andFIG. 8. The enhanced cover of the present invention comprises a cover12and solidified protection glue14, wherein the cover12has at least one blind hole10. The solidified protection glue14is arranged on an inner sidewall and an inner bottom surface of the blind hole10whereby the blind hole10is filled with the solidified protection glue14, and the solidified protection glue14spills from the blind hole10and is arranged on the surface of the cover12. For design, the solidified protection glue14arranged on the surface of the cover12has a thickness d2of larger than 0 μm and less than 250 μm, and the solidified protection glue14arranged on the surface of the cover12has a maximum width d3of larger than 0 μm and less than 250 μm. Besides, the cover12comprises glass, polymethylmethacrylate (PMMA), plastic, or sapphire, wherein the plastic is exemplified by poly(ether sulfones), polyethylene terephthalate or poly naphthalene two formic acid glycol ester. The solidified protection glue comprises resin and is colorful. For water adsorption, the solidified protection glue14has water adsorption of less than 1% at 25° C. in one day. For humidity, the solidified protection glue14has humidity of less than 100 g/m2in one day. For hardness, the solidified protection glue14has pencil hardness of larger than 450 g in one day. For thermal endurance, the solidified protection glue14has thermal endurance of larger than 200° C. in one day. Since the edge of the blind hole10is easily-broken positions, the solidified protection glue14is coated on the inner sidewall and the inner bottom surface of the blind hole10to effectively improve hardness of the blind hole10lest the blind hole10break.

The fabrication process of the third embodiment of the present invention is introduced as below. Refer toFIGS. 9(a)-9(d). Firstly, as shown inFIG. 9(a), a cover plate16is provided, wherein the cover plate16comprises glass, polymethylmethacrylate, plastic, or sapphire, and the plastic can be poly(ether sulfones), polyethylene terephthalate or poly naphthalene two formic acid glycol ester. Then, as shown inFIG. 9(b), the blind hole10is formed in the cover plate16using an etching method or a polishing method, thereby forming the cover12. The material of the cover plate16is the same to that of the cover12. Then, as shown inFIG. 9(c), liquidized protection glue18is formed on the inner sidewall and the inner bottom surface of the blind hole10using a spray coating method or a dispenser coating method, whereby the blind hole10is filled with the liquidized protection glue18, and the solidified protection glue14spills from the blind hole10and is arranged on the surface of the cover12. The liquidized protection glue18comprises resin. Finally, as shown inFIG. 9(d), the liquidized protection glue18is solidified to form the solidified protection glue14by irradiating ultraviolet light or high-temperature treatment. In the third embodiment, the present invention is exemplified by irradiating ultraviolet light.

In addition, the steps ofFIGS. 9(a)-9(b)are replaced with a step of directly providing the cover12having the blind hole10to simplify the fabrication process, as shown inFIG. 9(b).

In conclusion, the present invention coats the blind hole of the cover with the protection glue to improve hardness of the blind hole lest the cover break when the cover drops.