CN1436036A - Screen protection cover of portable electronic device and mfg. method thereof - Google Patents

Abstract

A screen protective cover for a portable electronic device and a processing method thereof, wherein the screen protective cover is composed of a plastic substrate and a silicon oxide coating covering the surface of the substrate, and the wear resistance, adhesion and scratch resistance of the silicon oxide coating surface are Compared with the existing substrate surface coated with ultraviolet curable paint, the comprehensive performance such as damage is significantly improved, and the coating layer is thinner. The processing method of the screen protection cover includes the following steps: (1) injection molding a plastic substrate; (2) pretreating the substrate, the pretreatment process mainly including cleaning and preheating; (3) passing a plasma chemical vapor phase on the surface of the substrate Deposit to form a layer of silicon oxide film. The method is easy to operate, the adhesion between the film and the substrate is firm, and the product yield is high.

Description

Portable electronic device screen protection cover and processing method thereof

【Technical field】

The present invention relates to a portable electronic device, especially a personal digital assistant (Personal Digital Assistant, PDA) screen protection cover. In addition, the present invention also relates to a processing method of the screen protection cover.

【Background technique】

There are a variety of portable electronic devices currently on the market, such as the Personal Digital Assistant (PDA), which is a new type of portable electronic device developed in recent years. It is small in size and can be operated on the palm of your hand. .

With the advancement of consumer electronics technology and the improvement of people's consumption concepts, consumers not only require more functions of personal digital assistants, but also require their production to be exquisite and beautiful.

Personal digital assistants have many functions: they can store a large amount of personal information, and can also be connected with computers for data transmission. When combined with wireless communication devices, they can be used as wireless communication tools, bringing many conveniences to workers outside the home.

However, there is no protective device installed on the periphery of the existing general personal digital assistant, so the PDA body is easy to wear and tear, especially in the process of carrying, the PDA body is more likely to be damaged due to factors such as collisions, especially the display screen is easy to wear and tear , causing confusion to the user.

Although some personal digital assistants are equipped with protection devices, such as a cover on the display screen, etc., which can protect the PDA body, these protection devices are rough in processing, resulting in poor surface quality and affecting the appearance, while PDA screen protection Because the cover is in direct contact with the user, its surface quality and aesthetics are particularly important.

In order to solve the above problems, some manufacturers arrange a protective device on the periphery of the PDA body, and coat the surface of the cover with ultraviolet curable varnish in order to improve the appearance and wear resistance of the cover. However, the appearance quality of the PDA screen protective cover processed by this method is difficult to reach the ideal situation, such as the surface is still easily scratched, and the wear resistance is poor, and the uniformity of the UV-curable paint coating on the substrate is technically difficult to control. , the coating is thicker, and the adhesion of the coating is poor. In addition, if the PDA screen protective cover is made of a transparent material, the UV-curable paint coating will affect the light transmittance of the protective cover and cause its transparency to decrease.

【Content of invention】

An object of the present invention is to provide a protective cover for a screen of a portable electronic device with excellent comprehensive properties such as wear resistance and scratch resistance.

Another object of the present invention is to provide a method for processing a screen protection cover of a portable electronic device. The processing method is simple and convenient, and the obtained screen protection cover is of high quality and beautiful appearance.

In order to achieve the above object: a screen protective cover for a portable electronic device disclosed by the present invention is composed of a plastic substrate and a silicon oxide coating. The overall performance is significantly improved compared with the surface of the substrate with the existing ultraviolet curing paint, and the coating is thinner. The screen protection cover, the protection jacket and the elastic body constitute a protection device, in which the portable electronic device can be accommodated.

In order to manufacture the screen protective cover of the above-mentioned portable electronic device, the processing method disclosed in the present invention includes the following steps: (1) injection molding the plastic substrate; (2) pretreatment to the substrate, the pretreatment mainly includes cleaning and preheating; (3) A layer of silicon oxide film is formed on the surface of the substrate by plasma chemical vapor deposition. The method is easy to operate, the adhesion between the film and the substrate is firm, and the product yield is high.

Compared with the prior art, the present invention has the advantages that: the portable electronic device screen protective cover of the present invention is made of a plastic substrate and a silicon oxide coating, and the hardness, wear resistance, adhesion, and shielding properties of the silicon oxide coating are Compared with the prior art, the comprehensive properties of uniformity and scratch resistance are significantly improved, and the coating layer is thinner. Moreover, the processing method of the present invention has the advantages of simple process, high product yield and excellent product surface performance. In addition, the transparent screen protection cover of the portable electronic device is manufactured by using the above processing method, and the cover body has good light transmission and smooth surface.

【Description of drawings】

FIG. 1 is an exploded perspective view of a portable electronic device applying the present invention.

Fig. 2 is a sectional view along line II-II of Fig. 1 .

Fig. 3 is a schematic diagram of a plasma chemical vapor deposition device used in the present invention.

【Detailed ways】

Please refer to FIG. 1 , the portable electronic device disclosed in the present invention refers to a personal digital assistant (PDA) in this embodiment, and its screen protection cover 111 and elastic body 112 are formed as a whole by combining an insert-molding method (Insert-Moulding) front cover 11. The front cover 11 and the protective jacket 13 are detachably connected through a pivot assembly (not shown) to form the protective device 1 for accommodating the PDA body 3 . When the PDA body 3 was placed in the protection device 1, the screen protection cover 111 was positioned above the display screen of the PDA body 3. If the screen protection cover 111 was a transparent material, the display of the PDA body 3 could be observed through the screen protection cover 111. content.

Referring to FIG. 2 , the screen protection cover 111 is composed of a base 1110 and a coating 1113 . The substrate 1110 is polycarbonate (Polycarbonate, PC), and the plating layer 1113 is silicon oxide, so the screen protection cover 111 is transparent. The above-mentioned silicon oxide coating 1113 can improve the properties of the polycarbonate substrate 1110, such as surface hardness, scratch resistance, wear resistance, light transmittance, smoothness and so on.

The processing method of the screen protection cover 111 includes the following steps:

(1) Injection molding polycarbonate substrate 1110;

(2) Carry out pretreatment to above-mentioned substrate 1110, and pretreatment mainly includes cleaning and preheating:

Body 1110 was alcohol cleaned and blow dried to remove dust, then put it in the oven at

Bake at 105-130°C for 20-40 minutes to remove low-molecular substances in the matrix 1110 and make

The substrate 1110 is preheated, and then taken out for plasma chemical vapor deposition;

(3) Put the pretreated substrate 1110 into the reaction chamber 6 for plasma chemical vapor deposition

Accumulation.

Please refer to Fig. 3 plasma chemical vapor deposition device, this device comprises: reaction chamber 6, two opposite electrode plates 63a, 63b that are arranged in reaction chamber 6, wherein electrode plate 63a is connected with radio frequency high-voltage power supply 64, and electrode plate 63b is grounded, The inlet pipes 65a, 65b are connected to the reaction chamber 6 to feed the working gas into the reaction chamber 6. The vacuum pump 68 is also connected to the reaction chamber 6 to evacuate the reaction chamber 6. The exhaust valve 66 is used for the plasma chemical gas phase. After the deposition, the remaining gas in the reaction chamber 6 is removed. The substrate 1110 to be plasma treated is placed on the electrode plate 63b in the reaction chamber 6 . The plasma chemical vapor deposition process includes the following steps:

(1) Vacuuming: the pretreated polycarbonate substrate 1110 is placed on the electrode plate in the reaction chamber 6

On 63b, close reaction chamber 6, vacuumize reaction chamber 6 by vacuum pump 68, make

The vacuum degree in the reaction chamber 6 is below 5mTorr;

(2) Introduce working gas: introduce reaction monomer 1,1,3,3- in reaction chamber 6 through inlet pipe 65a

Tetramethyldisiloxane (Tetramethyldisiloxane, TMDS), the control monomer flow is

50～150SCCM (Standard Cubic Centimeter per Minute, standard cubic centimeter/

Minutes), connect the RF high-voltage power supply 64, its power is 300W, and the RF frequency is controlled at

298 ~ 300MHz, to form a monomer layer around the substrate 1110 to improve plasma chemistry

Vapor deposition efficiency, after 5 minutes, O ₂ is introduced into the reaction chamber from the inlet pipe 65b, and O ₂ is controlled

The flow rate is 200~300SCCM;

(3) Preset pressure: set the air pressure in the reaction chamber 6 to 50-55mTorr, stop introducing the working gas,

At this time, the volume percentage of ₀₂ is 65-75%, and the volume of monomer 1,1,3,3-tetramethyldisiloxane is 100%.

The proportion is about 15-25%, and the volume percentage of other impurity gases is controlled within 10%;

(4) Excite plasma: adjust the power of the radio frequency power supply 64 to 600W, and the radio frequency is

598～600MHz, the working gas forms plasma under the excitation of high frequency voltage, plasma

The active group O ^* in the body chemically reacts with the Si-H bond to form silicon oxide, which is deposited on the base

A protective film 1113 is formed on the surface of the body 1110, and this process lasts for 20 to 35 minutes;

(5) Exhaust: cut off the power supply 64, and when the temperature in the reaction chamber 6 drops below 80°C, turn on the exhaust

Valve 66, to get rid of the residual gas in the reaction chamber 6, then take out the product.

The quality of the prepared product can be tested: uniform coating coverage, smooth surface, high transparency; film thickness of 3.5 ~ 4.0 μm; excellent wear resistance through the wear tester; 3M strong adhesive for Baige experiment On the surface of the film, there is no release phenomenon after the 3M super glue is peeled off, which proves that the film and the substrate have a strong bonding effect.

In the present invention, under the premise of ensuring that the PDA screen protection cover is processed according to the above method, the screen protection cover 111 can be directly connected with the protection jacket 13 through a pivotal assembly or integrally formed to form the protection device 1, or only by The screen protection cover 111 constitutes the protection device 1, and the protection device 1 can be used to protect the PDA body or other portable electronic devices. The protection device 1 and the protected portable electronic device can be separated or assembled together through a pivot assembly.

Portable electronic device screen protective cover of the present invention, except can be used for protecting PDA, also can be used for protecting other portable electronic devices, as pager, mobile phone etc. The protective cover is the same and will not be described in detail here.

Claims (11)

1. a portable electron device screen protection is covered, and matrix is plastics, it is characterized in that: be coated with one deck Si oxide coating at least at surface of plastic matrix.

2. portable electron device screen protection lid as claimed in claim 1 is characterized in that: this screen protection lid is a transparent material.

3. portable electron device screen protection lid as claimed in claim 1, it is characterized in that: this Si oxide thickness of coating is 3.5～4.0 μ m.

4. portable electron device screen protection lid as claimed in claim 2, it is characterized in that: the material of this plastic substrate is Merlon (Polycarbonate).

5. the processing method of portable electron device screen protection lid may further comprise the steps:

(1) ejection formation one plastic substrate;

(2) plastic substrate is carried out preliminary treatment, wherein preprocessing process comprises cleaning and preheating;

(3) pretreated matrix is put into reative cell and carry out plasma activated chemical vapour deposition, at it

The surface forms Si oxide coating.

6. the processing method of portable electron device screen protection lid as claimed in claim 5; it is characterized in that: this preprocessing process is earlier matrix to be carried out alcohol wash and dry up; put it into then in the baking oven and toasted 20～40 minutes down, take out in order to plasma activated chemical vapour deposition afterwards at 105～130 ℃.

7. the processing method of portable electron device screen protection lid as claimed in claim 5, it is characterized in that: above-mentioned reative cell ionic medium body chemical vapor phase growing technology further may further comprise the steps:

(1) vacuumizes;

(2) import working gas;

(3) preset pressure;

(4) activated plasma;

(5) exhaust.

8. the processing method of portable electron device screen protection lid as claimed in claim 7 is characterized in that: in vacuumizing operation, vacuum degree is below the 5mTorr in the reative cell.

9. the processing method of portable electron device screen protection lid as claimed in claim 7; it is characterized in that: in importing the working gas operation; at first in reative cell, import monomer 1,1,3; the 3-tetramethyl disiloxane; the flow of control monomer is 50～150SCCM (Standard Cubic Centimeter per Minute, a standard cubic centimeters per minute), and it is 300W that the high-voltage radio-frequency power is set; rf frequency is 298～300MHz, imports O after 5 minutes in reative cell ₂, O ₂Flow is 200～300SCCM.

10. the processing method of portable electron device screen protection lid as claimed in claim 7, it is characterized in that: in the pressure operation was set, the reative cell internal pressure was 50～55mTorr; wherein monomer 1,1, and 3; 3-tetramethyl disiloxane percent by volume is about 65～75%, O ₂Be about 15～25%, other foreign gas percents by volume are controlled in 10%.

11. the processing method of portable electron device screen protection lid as claimed in claim 7; it is characterized in that: in the activated plasma operation; it is 600W that the high-voltage radio-frequency power is set, and rf frequency is 598～600MHz, and the plasma activated chemical vapour deposition time is 20～35 minutes.

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