JP6279213B2 - External protective cover glass for electronic devices - Google Patents

Description

  The present invention relates to an outside of an electronic device that is detachably attached to an electronic device such as a mobile phone (smart phone), a portable game machine, a PDA (Personal Digital Assistant), a digital still camera, a video camera, or a PC (Personal Computer). The present invention relates to an attached protective cover glass.

  For example, as shown in Patent Document 1, an exterior cover glass is attached to an electronic device such as a portable device so as to form a part of the exterior of the electronic device on the front surface of the display screen. As shown in FIG. 10 of Patent Document 2, the exterior cover glass is attached to the bezel (frame portion of the casing) of the casing of the electronic device. Based on the bezel.

  Here, there is a high demand from users of electronic devices such as portable devices in recent years to further suppress scratches and dirt generated on the exterior of an electronic device including an exterior cover glass. In response to such demands, a resin-made external protective film such as a PET film as shown in Patent Document 3 has been generally known as an external protective material for electronic devices. On the other hand, there is an increasing demand for an external protective cover glass that is a glass material in that it is hard and hard to be damaged, and has a higher texture than a resin material.

JP 2009-167086 A JP 2008-271192 A Utility Model Registration No. 315538

  The external protective cover glass is usually affixed by a user of the electronic device, but the bezel of the casing of the electronic device generally protrudes outward in the thickness direction of the casing from the cover glass for the exterior. Since there is almost no convex structure on the surface of the electronic device, not the structure, the user (end user) must perform the alignment when attaching the external protective cover glass to the electronic device. . For this reason, in the external protective cover glass, a sticking position shift with respect to the exterior of the electronic device tends to occur. In particular, in an electronic device having a voice input / output function such as a call function, it is necessary to align an external protective cover glass so as to correspond to the position of a microphone, a speaker, or the like on the front surface of the electronic device.

  In order to correct the above-described misalignment of the external protective cover glass, the user needs to re-paste, and in order to re-paste, the external protective cover glass needs to be peeled off. . In particular, a glass material has a higher rigidity than a film material and is difficult to be deformed. Therefore, a peelability that is not recognized by a flexible film material having a low rigidity is a problem. However, there has been no conventional technique for improving the peelability when reattaching the external protective cover glass.

  Then, an object of this invention is to provide the external protection cover glass for electronic devices which can improve the peelability in the case of affixing again.

  In order to solve the above-described problems, a typical configuration of the present invention is an external protective cover glass for an electronic device that can be attached and detached so as to cover a part of the exterior of the electronic device. A second main surface that is a back surface with respect to the main surface of the first electronic device and is arranged toward the exterior of the electronic device, and an end surface that connects the first main surface and the second main surface, At least a part of the outer periphery of the main surface is provided with a recessed portion that is recessed from the end surface toward the inner side in the surface direction of the second main surface.

  According to the above configuration, when the external protective cover glass for electronic device is attached to the electronic device, a gap is generated between the external protective cover glass for electronic device and the electronic device due to the recess. Since the user can detach the external protective cover glass for electronic devices by hooking a nail or the like into the gap, it is possible to realize an external protective cover glass for electronic devices made of glass with good peelability.

  The glass plate having the first main surface, the second main surface, and the end surface, and the second main surface, and at least a part of the outer peripheral end is formed on the second main surface rather than the end surface. It is good to provide the sticking part which is arrange | positioned at intervals at the surface direction inside, makes a hollow part, and makes a glass plate removable to the exterior of an electronic device.

  According to the above configuration, at least a part of the outer peripheral end of the sticking portion is arranged at an interval on the inner side in the plane direction of the second main surface with respect to the end surface to form the recess. Therefore, a hollow part can be formed easily.

  The depth from the end surface of the recess is preferably in the range of 0.1 mm to 0.3 mm.

  According to the said structure, coexistence of peelability and aesthetics can be aimed at. That is, when the depth from the end face is 0.1 mm or more, the peelability can be further exhibited. When the depth from the end surface exceeds 0.3 mm, dust or the like accumulates in the recessed portion with the passage of time, which may impair the beauty.

  When the glass plate having the first main surface, the second main surface, and the end surface is provided, and an interposed surface forming at least a part of the recess is formed between the end surface and the second main surface. Good.

  According to the said structure, a part of hollow part can be formed with the structure of a glass plate. This configuration also makes it easier for the user to hook a nail or the like into the gap, so that the peelability of the external protective cover glass for electronic devices can be improved.

  The end face may be an inclined face that is inclined so as to taper from the second main surface side toward the first main surface side and forms a straight line or a curve in a sectional view.

  According to the said structure, catching of a user's finger | toe etc. can be prevented in the edge of a glass plate. Therefore, it is particularly effective in the case of a smartphone having a touch panel display.

  The external protective cover glass for electronic devices may be detachable so as to cover the main surface of the cover glass for exterior that forms part of the exterior of the electronic device.

  According to the said structure, it can prevent that a damage | wound and dirt are attached to the cover glass of an electronic device.

  ADVANTAGE OF THE INVENTION According to this invention, the external protection cover glass for electronic devices which can improve the peelability in the case of re-sticking can be provided.

It is a figure which shows the state which affixed the external protection cover glass for electronic devices concerning 1st Embodiment to the electronic device. It is a typical cross-sectional view after affixing the external protective cover glass for electronic devices of FIG. 1 to an electronic device. FIG. 3 is an enlarged view of a range X in FIG. 2. It is a figure which shows the layer structure of the external protection cover glass for electronic devices of FIG. It is a figure shown about the procedure which forms the external protection cover glass for electronic devices of FIG. It is explanatory drawing about the range which forms the hollow part of FIG. It is a figure which shows the outer peripheral part of the external protection cover glass for electronic devices concerning 2nd Embodiment. It is a figure which shows the other example of the external protection cover glass for electronic devices concerning 2nd Embodiment. It is a figure which illustrates the processing method of the outer peripheral part of the glass plate of FIG. 7, FIG.

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. The dimensions, materials, and other specific numerical values shown in the embodiments are merely examples for facilitating understanding of the invention, and do not limit the present invention unless otherwise specified. In the present specification and drawings, elements having substantially the same function and configuration are denoted by the same reference numerals, and redundant description is omitted, and elements not directly related to the present invention are not illustrated. To do.

[First embodiment]
FIG. 1 is a diagram illustrating a state in which an external protective cover glass for electronic devices (hereinafter referred to as a protective cover glass) 100 according to the first embodiment is attached to an electronic device. As shown in FIG. 1, the protective cover glass 100 is an external protective cover glass that is detachably attached so as to cover a part of the exterior of the electronic device. In the first embodiment, the smartphone 300 is exemplified as the electronic device. However, the electronic device is not limited to this, and other mobile phones, portable game machines, PDAs (Personal Digital Assistants), digital still cameras, video cameras, Alternatively, a slate PC (Personal Computer) or the like may be used.

  The smartphone 300 includes a touch panel display 302 and an exterior cover glass (electronic device cover glass) 304 that covers the surface of the touch panel display 302. The exterior cover glass 304 is attached to the inside of the bezel of the housing 306 so as to form a part of the exterior of the smartphone 300.

  The protective cover glass 100 includes a glass plate 102. The protective cover glass 100 is attached by the user of the smartphone 300 so as to cover the outer main surface of the exterior cover glass 304 in order to protect the exterior cover glass 304.

  FIG. 2 is a schematic cross-sectional view after the protective cover glass 100 of FIG. 1 is attached to an electronic device (smart phone 300). In FIG. 2, the exterior cover glass 304 is illustrated for the smartphone 300, and components other than the exterior cover glass 304 are schematically illustrated as the smartphone body 300 </ b> A.

  As shown in FIG. 2, the protective cover glass 100 is provided on the back side of the glass plate 102 for protecting the electronic device (for example, the smartphone 300) and the glass plate 102. The glass plate 102 is used as the electronic device (the smartphone 300). An attaching portion (attachment layer) 104 for attaching in a detachable manner is included. The glass plate 102 includes a front surface 102B (first main surface), a back surface 102C (second main surface) for placement toward the exterior of the electronic device, and an end surface 102A that connects the front surface 102B and the back surface 102C. Have. Moreover, the thickness of the glass plate 102 is 0.2-0.5 mm. Further, as shown in FIG. 1, an opening is formed in the glass plate 102 so as to correspond to a position of a microphone, a speaker, a button, or the like of the electronic device. The affixing portion 104 is formed over the entire surface other than the opening portion and the outer peripheral portion of the back surface 102C of the glass plate 102 in plan view.

  FIG. 3 is an enlarged view of a range X in FIG. As shown in FIG. 3, the protective cover glass 100 has, as an overall structure, a recess 106 that is recessed toward the inside in the surface direction on the back surface side of the outer peripheral portion thereof. In the first embodiment, the recess 106 is arranged so that the outer peripheral edge 104A of the sticking part 104 is arranged on the inner side in the plane direction (left and right direction in FIG. 3) with respect to the back surface 102C from the end surface 102A of the glass plate 102. Are formed as a space surrounded by the outer peripheral portion 104A, the outer peripheral end 104A of the sticking portion, and the cover glass 304 for exterior.

  By forming the recess 106 as described above, when the protective cover glass 100 is attached to the smartphone 300, a gap is generated between the protective cover glass 100 and the smartphone 300 by the recess 106. Therefore, the user can detach the protective cover glass 100 by hooking a nail or the like into the gap. Therefore, the protective cover glass 100 made of glass with good peelability can be realized.

  In particular, by forming the recess 106 by arranging the outer peripheral edge 104A of the affixing portion 104 at a distance from the end face 102A, the recess 106 can be easily formed without processing the glass with high hardness. Can do.

  FIG. 4 is a diagram showing a layer structure of the protective cover glass 100 of FIG. 1, and FIG. 5 is a diagram showing a procedure for forming the protective cover glass 100 of FIG. As shown in FIG. 5, the protective cover glass 100 is subjected to (1) a glass plate forming step S400, (2) a chemical strengthening step S402, (3) an antifouling coat forming step S404, and (4) a pasting part forming step S406. Manufactured.

In the glass plate forming step S400, the glass plate 102 having a desired shape is formed by machining or etching. The glass plate _102, SiO 2: 58-75 _{wt%, Al} 2 O 3: _{4~20 wt%,} Li 2 O: _{3~10 wt%,} Na 2 O: _4~13 alumina silicate containing wt% Although it is preferable to use glass, not only this but soda lime glass etc. may be used.

  In the chemical strengthening step S402, the glass plate 102 obtained in step S400 is chemically strengthened. In the chemical strengthening treatment, the glass plate 102 is brought into contact with the melted chemical strengthening salt, whereby an alkali metal ion having a relatively large atomic radius in the chemical strengthening salt and a relatively small atomic radius in the glass plate 102 are obtained. This is a treatment for exchanging the alkali metal ions and causing the alkali metal ions having a large ion radius to permeate into the surface layer of the glass plate 102 to generate compressive stress.

  As the chemically strengthened salt, it is preferable to use an alkali metal nitrate such as potassium nitrate or sodium nitrate. Further, as a method of chemical strengthening treatment, a low temperature type ion exchange method in which ion exchange is performed in a temperature range not exceeding the temperature of the glass transition point, for example, a temperature of 300 to 500 degrees Celsius is preferable. Since the chemically strengthened glass plate 102 has improved strength and is excellent in impact resistance, the glass plate 102 for the external protective cover glass 100 can be a sufficient external protective cover, for example, even with a thickness of about 0.3 mm. The effect as glass can be demonstrated.

  In the antifouling coating forming step S404, the antifouling coating 110 is formed on the glass plate 102 chemically strengthened in step S402. The antifouling coating 110 is applied and formed on the surface of the glass plate 102 by, for example, a spray method, a dip method, a vapor deposition method, or a brush coating method. The coating material is preferably a perfluoropolyether compound (fluorine resin) having a hydroxyl group at the terminal group. Thereby, it can couple | bond firmly with functional groups, such as a hydroxyl group and a carboxyl group in the surface of the glass plate 102, and can exhibit high durability. Further, by forming the antifouling coat 110, it is possible to suppress the adhesion of dirt such as fingerprints, and to easily wipe off even if dirt such as fingerprints adheres.

  In the pasting part forming step S <b> 406, the pasting part 104 is formed on the glass plate 102. The affixing part 104 is formed of a silicon adhesive. Here, the affixing part 104 affixes the reinforcing film for reinforcing the glass plate 102, the first adhesive layer for adhering the back surface 102C and the reinforcing film, and the reinforcing film to the cover glass 304 for exterior. The structure which has the 2nd contact bonding layer which consists of this silicon type adhesive agent (all of each layer is not shown in figure) may be sufficient. By providing such a reinforcing film, the glass plate 102 can be reinforced from the back side. Moreover, it is preferable that the thickness of the sticking part 104 exists in the range of 0.02-0.2 mm from a viewpoint which makes compatible the exhibit of peelability and thickness reduction of the protective cover glass 100, More preferably, it is 0.00. It is in the range of 05-0.1 mm.

  Refer to FIG. 3 again. As shown in FIG. 3, the length L1 (the depth dimension from the end surface 102A of the recess 106) L1 that is recessed toward the inside of the recess 106 is 0.1 mm to 0.3 mm than the end surface 102A of the glass plate 102. It is good to be in the range. Thereby, coexistence of peelability and aesthetics can be aimed at. That is, when length L1 is 0.1 mm or more, peelability can be exhibited more. When the length L1 exceeds 0.3 mm, dust, sebum, etc. accumulate in the hollow part 106 with the passage of time, and there is a possibility that the aesthetic appearance of the smartphone 300 may be impaired. In particular, portable electronic devices such as a mobile phone including the smartphone 300 are often placed in a pocket of a user's clothes, and therefore, clothes fibers and the like tend to collect in the recess 106 as dust.

  FIG. 6 is an explanatory diagram of a range in which the recess 106 in FIG. 3 is formed. FIG. 6A is a diagram showing a first example, and FIG. 6B is a diagram showing a second example. 6 (a) and 6 (b), the range of the depression 106 is indicated by a dotted line.

  As shown in FIG. 6A, a recess 106 may be provided on the entire back surface of the outer periphery of the protective cover glass 100. Moreover, as shown in FIG.6 (b), you may provide the recessed part 106 only in the one part edge | side of the back surface side of the outer peripheral part of the protective cover glass 100. FIG. In FIG. 6B, the depression 106 is provided on one side of the pair of short sides of the smartphone 300 (the upper side of FIG. 6B). However, the depression 106 is not limited to this. The depression 106 may be provided in at least a part of the outer peripheral portion of the protective cover glass 100, such as providing a depression in the shape of a circular arc in plan view, or in a corner portion of the protective cover glass 100 in plan view. .

[Second Embodiment]
In the said 1st Embodiment, although demonstrated so that the hollow part 106 might be formed according to the position of 104 A of outer peripheral ends of the sticking part 104, as for the protective cover glass 200 concerning 2nd Embodiment, the back surface side of the outer peripheral part of the glass plate 202 is inside. It is different from the protective cover glass 100 according to the first embodiment in that it is recessed toward the surface and forms a part of the recessed portion 106.

  FIG. 7 is a view showing an outer peripheral portion of the protective cover glass 200 according to the second embodiment, and FIG. 8 is a view showing another example of the second embodiment. 7 and 8 are diagrams corresponding to FIG. 3 of the first embodiment.

  In the protective cover glass 200 shown in FIG. 7, an interposition surface 202 </ b> D is formed between the end surface 202 </ b> A and the back surface 202 </ b> C of the glass plate 202, which is inclined toward the inner side (the inner side in the surface direction of the back surface 202 </ b> C). Yes. The interposed surface 202D may be formed on the entire circumference of the outer periphery of the glass plate 202, or may be formed only on a part of the outer periphery, a part of the outer periphery, or a corner of the glass plate 202 in plan view. May be. The interposed surface 202D constitutes a part of the contour of the recess 106.

  With such a configuration, a gap generated between the protective cover glass 200 and the smartphone 300 can be made larger than the thickness of the pasting portion 104. This makes it easier for the user to hook a nail or the like into the gap of the recess 106. Therefore, the peelability of the protective cover glass 200 can be enhanced as compared with the first embodiment.

  In the protective cover glass 210 shown in FIG. 8, the glass plate 212 includes a front surface (first main surface) 212B, a back surface (second main surface) 212C, an end surface 212E that is an inclined surface that forms a curve in cross-sectional view, and a back surface. An interposition surface 212D is provided between 212C and the end surface 212E. The end surface 212E is inclined so as to taper from the back surface 212C side to the front surface 212B side. Further, a boundary portion 212F between the surface 212B and the end surface 212E of the glass plate 212 has a rounded shape. Further, the boundary portion 212A between the end surface 212E and the interposition surface 212D (the outermost peripheral portion of the end surface 212E) is also rounded.

  In addition, in the height of the thickness direction of the glass plate 212, it is preferable that the height of the end surface 212E is higher than the height of the interposition surface 212D. This is because the smoothness when touched is more important than the ease of hooking during normal use (after completion of the pasting operation).

  As described above, since the end surface 212E is inclined so as to taper from the back surface 212C side to the front surface 212B side, it is possible to prevent the user's finger or the like from being caught when operating the user's electronic device. . Further, by rounding the boundary portion 212A between the surface 212B and the end surface 212E of the glass plate 212, the tactile sensation when the user touches the boundary portion with a finger can be made smoother. Therefore, it is particularly effective in the case of the smartphone 300 having the touch panel display 302.

  FIG. 9 is a diagram illustrating a method for processing the outer peripheral portions of the glass plates 202 and 212 in FIGS. 7 and 8.

  FIG. 9A is a diagram for processing the glass plate 202 by machining. When forming the intervening surface 202D having a straight cross-sectional shape like the glass plate 202 of FIG. 7, the machining (for example, processing using the rotating grindstone 308) illustrated in FIG. 9A is effective. .

  FIG. 9B is a diagram for processing the glass plate 212 by etching. When forming the intervening surface 212D having a curved cross-sectional shape like the glass plate 212 of FIG. 8, the processing by etching illustrated in FIG. 9B is effective. Further, in the case where the end surface 212E is formed in addition to the intervening surface 212D and the boundary portion 212F is rounded, it is advantageous because it can be formed at a time by etching. Specifically, the region other than the region to be etched of the glass plate 212 is masked with the resist material 310, and the front surface side is etched more than the back surface side, whereby the interposition surface 212D, the end surface 212E of FIG. In addition, the shapes of the boundary portions 212A and 212F can be suitably formed.

  In addition, in each said embodiment, the structure which affixes the protective cover glass 100,200,210 on the cover glass 304 for exterior | packing of the smart phone 300 was demonstrated. However, the present invention is not limited to this, and for example, a configuration in which the smartphone 300 is attached to the back side of the housing 306 may be used.

  As an example, as shown in FIG. 3 of the first embodiment, only the outer peripheral end 104A of the sticking part 104 is arranged at a distance from the end face 102A to form the recessed part 106, and the length L1 of the recessed part 106 is changed. Then, testing and evaluation were performed. The thickness of the glass plate 102 was 0.3 mm, and the height of the recess 106 was 0.1 mm.

Each of the protective cover glasses 100 having the length L1 of the hollow portion 106 of Samples 1 to 10 shown in Table 1 was prepared, and the following test was performed. That is, each protective cover glass of samples 1 to 10 was actually attached to the smartphone 300, and it was tested how many times the test subject could peel off the protective cover glass with a finger. The criteria for evaluation are as follows.
◎… Success in 1 time, ○… Success in 2 to 3 times, △… Success in 4 to 5 times, ×… Success in 6 times or more

  Furthermore, in order to investigate the product property of each protective cover glass of Samples 1 to 10, after each protective cover glass was attached to the smartphone 300, the state after 30 days of use was examined. In the present embodiment, as the smartphone 300, a smartphone whose outer periphery is covered with black paint is used.

[result]
From Table 1 above, it was found that the length L1 (depth dimension from the end face 102A of the recess 106) L1 should be in the range of 0.1 mm to 0.3 mm.

  As mentioned above, although preferred embodiment of this invention was described, it cannot be overemphasized that this invention is not limited to the example which concerns. It will be apparent to those skilled in the art that various changes and modifications can be made within the scope of the claims, and these are naturally within the technical scope of the present invention. Understood.

  In particular, in the first and second embodiments described above, the description has been made centering on the configuration in which the outer peripheral end of the pasting portion is arranged at a distance from the end surface of the glass plate on the inner side in the surface direction of the rear surface of the glass plate. However, a notch structure may be provided between the second main surface and the end surface of the glass plate, and only this notch structure may be used as the depression. For example, in this case, in the cross-sectional view, the position of the outer peripheral edge of the sticking part and the position of the end face of the glass plate may be matched so that the outer peripheral part of the sticking part follows the inner surface of the notch structure of the glass plate. Good. Thereby, a clearance gap is formed between the outer peripheral part of a sticking part and the exterior of an electronic device, and this clearance gap can be made into a hollow. In such a configuration, a process of reducing the adhesiveness of the outer peripheral portion of the pasting portion may be performed in advance.

  The present invention is an external device for an electronic device that is detachably attached to an electronic device such as a mobile phone (smart phone), a portable game machine, a PDA (Personal Digital Assistant), a digital still camera, a video camera, or a PC (Personal Computer). It can be used for protective cover glass.

100, 200, 210 ... protective cover glass, 102, 202, 212 ... glass plate, 102A, 202A ... end face, 102B, 202B, 212B ... front surface (first main surface), 102C, 202C, 212C ... back surface (second) ), 202D, 212D ... interposition surface, 212E ... end surface, 212A, 212F ... boundary portion, 104 ... sticking portion, 104A ... outer peripheral edge, 106 ... dented portion, 110 ... antifouling coat, 300 ... smart phone, 300A ... Smartphone body, 302 ... Touch panel display, 304 ... Cover glass for exterior, 306 ... Housing, 308 ... Rotary grindstone, 310 ... Resist material

Claims (5)

An external protective cover glass for an electronic device that can be attached and detached so as to cover a part of the exterior of the electronic device,
A first main surface, a second main surface that is a back surface with respect to the first main surface and is arranged toward the exterior of the electronic device, and the first main surface and the second main surface. A glass plate having end faces to be joined;
Attaching part for making the glass plate detachable on the exterior of the electronic device,
An intervening surface is formed between the end surface of the glass plate and the second main surface,
An external attachment for an electronic device, wherein a gap is provided between an exterior of the electronic device and the interposition surface by a recess formed by at least a part of an outer peripheral end of the interposition surface and the sticking portion. Protective cover glass.   2. The external protective cover glass for an electronic device according to claim 1, wherein the glass plate has a thickness in a range of 0.2 to 0.5 mm and is chemically strengthened.   3. The external protective cover glass for an electronic device according to claim 1, wherein a depth of the hollow portion from the end surface is in a range of 0.1 mm to 0.3 mm.   The end face is an inclined surface that is inclined so as to be tapered from the second main surface side toward the first main surface side, and forms a straight line or a curve in a sectional view. 4. The external protective cover glass for electronic equipment according to any one of 3 above.   The external protective cover for an electronic device according to any one of claims 1 to 4, wherein the external protective cover for an electronic device is detachable so as to cover a main surface of an exterior cover glass that forms a part of the exterior of the electronic device. Glass.

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