Mobile phone cover plate

Abstract

The utility model discloses a mobile phone cover plate which is composed of a ceramic flat sheet, a ceramic crater and a solder layer, and the ceramic crater is fixedly connected with the ceramic flat sheet through the solder layer. The ceramic crater is a conical crater-like protrusion on the mobile phone cover plate and can enlarge the space for containing electronic components in the intelligent mobile phone, and a camera module, a flash lamp, a fingerprint recognition module and other components on the intelligent mobile phone can be integrated in the ceramic crater.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the field of communication equipment accessories manufacturing, concretely relates to a mobile phone ceramic cover plate. BACKGROUND

[0002] With the popularity of smart phones, people like to use smart phones to take pictures more and more, and the requirements for the picture taking of smart phones are also higher and higher. In order to achieve better picture taking effect, the structure of the camera module is more and more complex, the number of lenses is more and more, and the sensor is also more and more large. The original mobile phone body space cannot carry all the camera components, in order to solve this problem, only the camera protrudes from the body, and the crater structure on the mobile phone cover plate emerges as the times require. The crater structure refers to a kind of conical shape on the mobile phone cover plate, which is similar to the crater. The protrusion increases the space for accommodating electronic components in the smart phone. The camera module, flash, fingerprint recognition module and other components on the smart phone can be integrated in the protrusion. In order to accommodate larger and more complex camera modules, the height and angle of the crater structure have become a new trend, but with the increase of the height and angle of the crater structure, the difficulty and cost of processing the mobile phone cover plate also increase.

[0003] In the high-end market of smart phones, especially flagship models, ceramic mobile phone cover plates are usually used. The mobile phone ceramic cover plate with crater structure is usually made by dry pressing combined with isostatic pressing, and then processed by high temperature sintering. This process can complete the processing of the crater complex structure ceramic cover plate, but it has the problems of high material consumption, long processing time and high cost, which limits its large-scale application in the smart phone market. With the increase of the height and angle of the crater, the contradiction between processing efficiency and production cost is intensified, the practicability is poor, and commercial application cannot be realized.

[0004] The existing processing method has the following problems: 1. A thick ceramic needs to be removed by removing the excess part to obtain a ceramic cover plate with a camera lens and a battery cover, which has a very high cost due to the cost of ceramic and equipment processing. There is no effective method to reduce the cost in the industry, so this design is only suitable for positioning high-end mobile phones; 2. Some ceramic back covers have frosted design, and the camera lens position is generally mirror surface effect. The problem of how to ensure that the camera lens is still mirror surface after the frosted treatment of the back cover needs to be solved. The current solution is to print a protective coating at the camera lens position, and then remove the coating after the frosted treatment to obtain a light and frosted integrated cover plate. However, this improvement increases two processes of printing protective coating and removing coating, which increases the cost. SUMMARY

[0005] In order to overcome the deficiencies in the prior art, the utility model provides a mobile phone cover plate, and the specific technical scheme is as follows:

[0006] A mobile phone cover plate is composed of a ceramic flat sheet, a ceramic crater and a solder layer, and the ceramic crater is fixedly connected with the ceramic flat sheet through the solder layer. The ceramic crater refers to a conical protrusion on the mobile phone cover plate, which is similar to a crater, and can increase the space for accommodating electronic components inside the smart phone. The camera module, flash, fingerprint identification module and other components on the smart phone can be integrated in the crater.

[0007] The ceramic flat sheet is matched with the mobile phone body in shape and size, and the ceramic flat sheet is provided with a hole matched with the shape of the ceramic crater. The thickness of the ceramic flat sheet is 0.2-0.7 mm. The ceramic crater is a conical protrusion, and the height of the protrusion is 0.1-3 mm. The thickness of the solder layer is 0.01-0.2 mm.

[0008] Further, the thickness of the ceramic flat sheet is 0.2 mm or 0.3 mm or 0.4 mm or 0.5 mm or 0.6 mm or 0.7 mm or any value between two values in these values. The height of the protrusion of the ceramic crater is 0.1 mm or 0.5 mm or 1 mm or 1.5 mm or 2 mm or 2.5 mm or 3 mm or any value between two values in these values. The thickness of the solder layer is 0.01 mm or 0.05 mm or 0.1 mm or 0.15 mm or 0.2 mm or any value between two values in these values.

[0009] Further, the solder layer is an active metal brazing material of silver copper titanium (AgCuTi).

[0010] The surfaces of the ceramic flat sheet and the ceramic crater for welding are non-flat smooth interfaces, and are provided with an abrasive layer. The roughness R a of the abrasive layer is 0.05-1 µm. The roughness is for vacuum welding of the solder. The design can facilitate the contact and penetration of the active metal solder in the welding area of the ceramic flat sheet and the ceramic crater, form a rich interface layer and increase the interface bonding force.

[0011] The ceramic flat sheet and the ceramic crater are fixedly connected in a vacuum welding manner by using the active metal brazing material of silver copper titanium, the cavity rate of the solder in a liquid state is reduced, the welding strength is improved, and the application of the mobile phone ceramic cover plate with the crater in the mobile phone back cover is solved.

[0012] Compared with the prior art, the mobile phone ceramic cover plate has the following beneficial effects:

[0013] First, the processability is strong. The ceramic flat sheet and the ceramic crater are connected through vacuum brazing of the brazing material, the ceramic flat sheet and the ceramic crater are prepared respectively, and the processing difficulty caused by integral molding is effectively avoided. Moreover, the mobile phone ceramic cover plate obtained by active metal brazing has high reliability.

[0014] Second, the comprehensive performance is excellent, through the test, the mobile phone ceramic cover plate brazing material with the crater obtained by the utility model has low cavity rate, large peeling strength, good cold and hot impact and improved drop height of 50% compared with the drop height of the glass cover plate.

[0015] Compared with the ceramic cover plate integrated forming process, the welding technology in the utility model can ensure product quality, significantly improve the yield of the ceramic cover plate and reduce the cost. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 is the exploded structural schematic diagram of the mobile phone cover plate of the embodiment 1 of the application;

[0017] Figure 2 is the structural schematic diagram of the ceramic crater of the mobile phone cover plate of the embodiment 1 of the application;

[0018] Figure 3 is the structural schematic diagram of the ceramic flat sheet of the mobile phone cover plate of the embodiment 1 of the application.

[0019] Among them, 1-ceramic flat sheet, 2-solder layer, 3-ceramic crater. DETAILED DESCRIPTION

[0020] The specific embodiments of the utility model will be further described in detail below in combination with the drawings and the embodiments. The following embodiments are used to illustrate the utility model, but not to limit the scope of the utility model.

[0021] In the description of the utility model, it should be understood that the orientation or position relationship indicated by the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like in the utility model are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the utility model and simplifying the description, and therefore cannot be understood as indicating or implying that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the utility model. In addition, the terms "first", "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance.

[0022] In the description of the utility model, it should be pointed out that, unless otherwise explicitly specified and limited, the terms "mounting", "connection" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication inside two elements. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0023] Example 1

[0024] like Figures 1-3 As shown, this embodiment provides a mobile phone cover plate, including a ceramic flat plate 1, a solder layer 2, and a ceramic crater 3. The ceramic flat plate 1 and the ceramic crater 3 are brazed together by the solder layer 2. The composition of the solder layer 2 is a metal active solder, which can improve the bonding strength and impact resistance of the ceramic flat plate 1 and the ceramic crater 3. It can be used for welding various ceramic materials without affecting the quality of the mobile phone cover plate.

[0025] The ceramic flat plate 1 and the ceramic crater 3 are made of silicon nitride or zirconium oxide.

[0026] The ceramic flat sheet 1 can be formed by a casting process. Specifically, ceramic powder and binder can be mixed and cast in a casting machine, and then sintered at high temperature and pressure to obtain a sintered blank, which is then machined to obtain the ceramic flat sheet 1.

[0027] The ceramic volcano 3 can be formed by dry pressing. Specifically, ceramic powder and binder can be mixed, pressed and formed by mechanical press and green blank processing, and then sintered by high temperature and pressure to obtain sintered blank. The sintered blank is then machined to obtain the ceramic volcano 3.

[0028] Compared to other ceramic flat sheet materials, the ceramic flat sheet 1 made of silicon nitride has higher drop performance. In a preferred embodiment, both the ceramic flat sheet 1 and the ceramic crater 3 are made of silicon nitride.

[0029] The solder layer 2 is an AgCuTi (silver-copper-titanium) active metal brazing solder. By using AgCuTi active metal brazing solder, the bonding strength and impact resistance of the ceramic flat sheet 1 and the ceramic crater 3 can be improved.

[0030] The thickness of the solder layer 2 is 0.01~0.2mm, the thickness of the ceramic flat sheet 1 is 0.20~0.70mm, and the height of the ceramic crater 3 is 0.1~3mm.

[0031] In a preferred embodiment, the thickness of the solder layer 2 is 0.010~0.015mm, the thickness of the ceramic flat sheet 1 is 0.30~0.40mm, and the height of the ceramic crater 3 is 1.5~2.5mm.

[0032] The mobile phone cover plate of this embodiment is compared with existing mobile phone cover plates. The comparison results are shown in Table 1.

[0033] Table 1 compares the mobile phone cover plate of this embodiment with existing mobile phone cover plates.

[0034] Product Example 1 product Existing product Flat piece and crater connection mode Welding One-piece molding Production time 24h 72h Yield 95% 80% Overall drop height 1.8m 1.5m Weight 20g 50g Structural diversity Flat piece as thin as 0.2 mm, crater as high as 3 mm Flat piece thickness ≥ 0.6 mm, crater height ≤ 2 mm, shape limited Cost 100 yuan per piece 400 yuan per piece

[0035] The above merely is the preferred implementation form of the present application, and it should be noted that, for the ordinary skilled in the art, without departing from the technical principles of the present application, a number of improvements and substitutions can be made, and these improvements and substitutions should also be considered as the protection scope of the present application.

Claims

1. A cell phone cover plate, characterized by, It is composed of a ceramic flat sheet, a ceramic crater and a solder layer, and the ceramic crater is fixedly connected with the ceramic flat sheet through the solder layer.

2. The cell phone cover of claim 1, wherein, The ceramic flat sheet is matched with the mobile phone body in shape and size, and is provided with a hole matched with the ceramic crater in shape, and the thickness of the ceramic flat sheet is 0.2-0.7 mm; the ceramic crater is a conical convex shaped like a crater, and the height of the convex is 0.1-3 mm; and the thickness of the solder layer is 0.01-0.2 mm.

3. The handset cover plate of claim 1 or 2, wherein, The surfaces of the ceramic flat sheet and the ceramic crater for welding are provided with an abrasive layer.

4. The cell phone cover of claim 3, wherein, The roughness Rz of the said abrasive layer is comprised between 0.05 and 1 µm. a 0.05 and 1 µm.

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