Upper electrode device

An upper electrode device applied to the film coating process has a splitter chamber and at least three gas diversion plates; a gas inlet is set on the splitter chamber; the at least three gas diversion plates were fixed on the inside walls of the splitter chamber and used for diverting and outputting the gas introduced into the splitter chamber through the gas inlet. By using the upper electrode device provided by the present disclosure can uniformize the gas used for coating in the film coating process, especially uniformize the gas in the perimeter area and the center area. Consequently, the uniformity of the thickness of the whole film coated is improved.

CROSS-REFERENCE TO RELATED APPLICATIONS

The present application claims priority to and the benefit of Chinese Patent Application No. CN201310229521.X, filed on Jun. 8, 2013, the entire content of which is incorporated herein by reference.

BACKGROUND OF THE INVENTION

1. Field of the Invention

The present disclosure relates to a device in the technology field of film coating, more specifically, to an upper electrode device.

2. Description of the Related Art

In the related art of film coating, the upper electrode device in the gas diffusion system on the process machine generally comprises the gas diversion plate which is a three-layers structure.FIG. 1Ashows a side view of the upper electrode device in the related art;FIG. 1Bshows a vertical view of the upper electrode device in the related art. As shown inFIG. 1A, the upper electrode device comprises three gas diversion plates. From the top to the bottom, there is First Gas Diversion Plate1′, Second Gas Diversion Plate2′ and Third Gas Diversion Plate3′ in sequence, and hole(s) with the same size were formed on the surface of each gas diversion plate. As shown inFIGS. 1A and 1B, the holes were distributed in forms of matrix on the surface of each gas diversion plate. Holes41′ on the surface of First Gas Diversion Plate1′ was vertically staggered from Holes42′ on the surface of Second Gas Diversion Plate2′. Likewise, Holes42′ on the surface of Second Gas Diversion Plate2′ was vertically staggered from Holes43′ formed on the surface of Third Gas Diversion Plate3′. To some extent, the upper electrode device can divert the gas and makes the film coated more uniform, but in the actual process of coating film, effect of the gas diversion is not ideal. When the gas was diverted into the lowest layer during the process of film coating, the gas near the centre part is sufficient but the gas near the edge or the corners is insufficient, which causes that the thickness of the film coated is not uniform, i.e., the thickness in the center area of the film coated is thick and the thickness in the edge of the film coated is thin. Consequently, the performance of the device is low.

A related art has provided a sputtering coating equipment for improving the uniformity of the film, which comprises a square air inlet pipe and a round air inlet pipe. Twenty-two gas spray nozzles are installed on the surface of the square air inlet pipe, which faces to a target, and three hanging pieces are installed above the square air inlet pipe and used for fixing the whole air inlet device. The sputtering coating equipment is used for solving the problem that the thickness of the film coated by the device is uneven because of an uneven air supply device in the related art. However, the multiple gas spray nozzles cause a complicated structure of the device, and it is not easy to control the consistency between the gas spray nozzles. Hence, it is not easy to be applied in the actual manufacturing processes.

Another related art provides a coating device for a dispersion plate which is used for the dispersion of gas. The coating device comprises a hollow type shell body provided with a coating chamber, an electrode unit with a plurality of electrode plates which are separated arranged inside the coating chamber, a gas delivery pipe which delivers the coating gas into the coating chamber of the shell body, a suction unit of a pump which is communicated with the coating chamber, and a dispersion plate with a plurality of relief holes which are separated and close to the bottom side of the electrode plate. The relief holes are arranged on the most area of the bottom side of the electrode plate. With the relief holes, the coating gas can be uniformly distributed on the coating chamber, so the coating yield is increased and the overall coating efficiency is improved. Although the film coating device disclosed in this patent has the effect to disperse the gas, it did not relate to promoting the uniformity of the film at the area of the edges and the corners after the gas was dispersed.

Hence, there is no effective solution for solving the problem in the related arts.

SUMMARY OF THE INVENTION

An embodiment of the present disclosure is directed toward an upper electrode device capable of dispersing the gas for coating and uniformizing the film coated.

The upper electrode device comprises: a splitter chamber provided with a gas inlet; and at least three gas diversion plates fixed on the inside walls of the splitter chamber for diverting and outputting the gas introduced into the splitter chamber through the gas inlet.

According to one embodiment of the present disclosure, a plurality of blowholes are set on each gas diversion plate, and the bore diameter of the blowholes on the same gas diversion plate are the same.

According to one embodiment of the present disclosure, the gas inlet is set on the top of the splitter chamber;

the gas diversion plate is set below the gas inlet, and each gas diversion plate is parallel to the top surface of the splitter chamber.

According to one embodiment of the present disclosure, two gas diversion plates adjacent to each other and the inside walls between the two gas diversion plates together constitute a unit chamber;

the gas exchanged from a unit chamber to an adjacent unit chamber through the blowholes.

According to one embodiment of the present disclosure, the bore diameters of the blowholes on each gas diversion plate are larger than the bore diameters of the blowholes on the gas diversion plates below.

According to one embodiment of the present disclosure, the blowholes set on the gas diversion plates adjacent to each other are vertically, refer to the direction of the surface of the gas diversion plate, staggered.

According to one embodiment of the present disclosure, the at least three gas diversion plates comprise a top gas diversion plate, a bottom gas diversion plate and at least one middle gas diversion plate;

the gas introduced into the splitter chamber through the gas inlet diverted through the top gas diversion plate, the middle gas diversion plate and the bottom gas diversion plate in sequence; the gas gets out of the splitter chamber through the bottom gas diversion plate.

According to one embodiment of the present disclosure, a plurality of blowholes on the top gas diversion plate is distributed on the top gas diversion plate;

a plurality of blowholes on each middle gas diversion plate is distributed on the middle gas diversion plate;

the density of the blowholes on the bottom gas diversion plate gradually increases in direction from the geometrical center of the bottom gas diversion plate to its edge.

According to one embodiment of the present disclosure, the bottom gas diversion plate comprises a center area and a perimeter area; the density of the blowholes in the perimeter area is 1.1 to 1.2 times as the density of the blowholes in the center area.

According to one embodiment of the present disclosure, the perimeter area is the area within a distance of lower than 50 mm to the edge of the bottom gas diversion plate.

According to one embodiment of the present disclosure, the bore diameter of the blowholes on the top gas diversion plate ranges from 5 mm to 10 mm.

According to one embodiment of the present disclosure, the bore diameter of the blowholes on the bottom gas diversion plate ranges from 0.2 mm to 0.6 mm.

According to one embodiment of the present disclosure, the blowholes are extending through the upper surface and lower surface of each gas diversion plate.

DETAILED DESCRIPTIONS

As used herein, the term “plurality” means a number greater than one.

Hereinafter, certain exemplary embodiments according to the present disclosure will be described with reference to the accompanying drawings.

The upper electrode device in the present disclosure will be further illustrated based on the embodiments and the figures.

In the present disclosure, the upper electrode device comprises a splitter chamber and at least three gas diversion plates. The three gas diversion plates are set inside the splitter chamber and divide the internal space of the splitter chamber into at least three parts vertically. The spaces adjacent to each other are separated by one of the gas diversion plates.

A gas inlet is set on the top of the splitter chamber, through which the gas for coating can pass into the splitter chamber. The bottom of the splitter chamber is provided with a gas diversion plate for outputting the gas. The other parts of the splitter chamber are sealed with no opening. In another word, when the coating gas is led in through the gas inlet on the top of the splitter chamber, it can outflow only from the bottom of the splitter chamber.

The number of the gas diversion plates internally set in the splitter chamber usually can be three, four, five, six and so on.

FIG. 2shows a side view of the upper electrode device in the present disclosure. As shown inFIG. 2, in this embodiment, the number of the gas diversion plates is three, and the three gas diversion plates are set inside the splitter chamber and parallel to each other. From the bottom to the top in sequence, there is a Bottom Gas Diversion Plate1, a Middle Gas Diversion Plate2and a Top Gas Diversion Plate3. Bottom Gas Diversion Plate1is set in the bottom of the splitter chamber. The flat shape of Bottom Gas Diversion Plate1is the same as the cross section of the splitter chamber. The side of Bottom Gas Diversion Plate1was sealed up and fixed on the inside walls of the bottom of the splitter chamber. The Middle Gas Diversion Plate2is set above Bottom Gas Diversion Plate1. Similarly, the flat shape of Middle Gas Diversion Plate2is the same as the cross section of the splitter chamber. Meanwhile, the side of Middle Gas Diversion Plate2was sealed up and fixed on the inside walls of the splitter chamber. Top Gas Diversion Plate3is set above Middle Gas Diversion Plate2. Similarly, the flat shape of Top Gas Diversion Plate3is the same as the cross section of the splitter chamber. Meanwhile, the side of Top Gas Diversion Plate3was sealed up and fixed on the inside walls of the splitter chamber. After setting Bottom Gas Diversion Plate1, Middle Gas Diversion Plate2and Top Gas Diversion Plate3, the internal space of the splitter chamber is divided into three chambers. From the bottom to the top in sequence, there is a First Unit Chamber11, a Second Unit Chamber12and a Top Unit Chamber13. First Unit Chamber11is constituted by Bottom Gas Diversion Plate1, Middle Gas Diversion Plate2and the inside walls of the splitter chamber between Bottom Gas Diversion Plate1and Middle Gas Diversion Plate2. Second Unit Chamber12is constituted by Middle Gas Diversion Plate2, Top Gas Diversion Plate3and the inside walls of the splitter chamber between Middle Gas Diversion Plate2and Top Gas Diversion Plate3. Top Unit Chamber13is constituted by Top Gas Diversion Plate3, the top of the splitter chamber and the inside walls of the splitter chamber between Top Gas Diversion Plate3and the top of the splitter chamber.

As shown inFIG. 2, blowholes are set on the surface of Bottom Gas Diversion Plate1, Middle Gas Diversion Plate2and Top Gas Diversion Plate3. The blowholes are the holes extending through the upper surface and lower surface of each gas diversion plate. These blowholes are set for connecting the unit chambers in the different parts of the splitter chamber. First Unit Chamber11is connected to the outside area of the splitter chamber through Blowholes41set on Bottom Gas Diversion Plate1. Second Unit Chamber12is connected to First Unit Chamber11through Blowholes42set on Middle Gas Diversion Plate2. Top Unit Chamber13is connected to Second Unit Chamber12through Blowholes43set on Top Gas Diversion Plate3. Hence, after that the gas are introduced into the splitter chamber through the gas inlet and pass through the top unit chamber, the second unit chamber and the first unit chamber in sequence, the gas can get out of the splitter chamber through Blowholes41on Bottom Gas Diversion Plate1.

FIG. 3shows a vertical view of the top gas diversion plate in the upper electrode device of the present disclosure;FIG. 4shows a vertical view of the middle gas diversion plate in the upper electrode device of the present disclosure;FIG. 5shows a vertical view of the bottom gas diversion plate in the upper electrode device of the present disclosure. As shown inFIGS. 3 to 4, Blowholes42set on Middle Gas Diversion Plate2are distributed in matrix on the surface of Middle Gas Diversion Plate2. As shown inFIG. 3, Blowholes43set on Top Gas Diversion Plate3are distributed in matrix on the surface of Top Gas Diversion Plate3. This means that the blowholes on Middle Gas Diversion Plate2and on Top Gas Diversion Plate3are distributed uniformly. However, the bore diameters of the blowholes on the three gas diversion plates are different. Specifically, the bore diameters of the blowholes set on Bottom Gas Diversion Plate1are smaller than the bore diameters of the blowholes set on Middle Gas Diversion Plate2; the bore diameters of the blowholes set on Middle Gas Diversion Plate2are smaller than the bore diameters of the blowholes set on Top Gas Diversion Plate3. The blowholes on the gas diversion plates adjacent to each other are vertically staggered. In another word, the geometrical centers of the blowholes on the gas diversion plates adjacent to each other are not coincided in vertical direction. The geometrical centers of Blowholes41set on Bottom Gas Diversion Plate1are not coincided with the geometrical center of Blowholes42set on Middle Gas Diversion Plate2. The geometrical centers of Blowholes42set on Middle Gas Diversion Plate2are not coincided with the geometrical center of Blowholes43set on Top Gas Diversion Plate3in vertical direction.

Moreover, the density of Blowholes43set on Top Gas Diversion Plate3can be either the same as or the different from the density of Blowholes42set on Middle Gas Diversion Plate2, as long as Blowholes43set on Top Gas Diversion Plate3do not align with Blowholes42set on Middle Gas Diversion Plate2directly. As shown inFIG. 5, the distribution of Blowholes41set on Bottom Gas Diversion Plate1is different from the distribution of the blowholes set on Middle Gas Diversion Plate2or the on Top Gas Diversion Plate3. The blowholes set on Middle Gas Diversion Plate2and on Top Gas Diversion Plate3are distributed uniformly, i.e., the density of Blowholes42set on Middle Gas Diversion Plate2in any area on the gas diversion plate is the same; the density of Blowholes43set on Top Gas Diversion Plate3in any area on the gas diversion plate is the same. However, the density of Blowholes41set on Bottom Gas Diversion Plate1is gradually increased in the direction from the geometrical center of the gas diversion plate to the edge of it. In particular, the blowholes can be set as the follows: the density of Blowholes41in the perimeter area of Bottom Gas Diversion Plate1, which are within the distance of 50 mm from the edge of the bottom gas diversion plate1, is 1.1 to 1.2 times of the density of the blowholes in the center area of Bottom Gas Diversion Plate1, such as 1.1 times, 1.11 times, 1.12 times, 1.15 times, 1.2 times.

According to the difference of the positions where each of the gas diversion plate is located in the upper electrode device, from the top to the bottom, the bore diameters of the blowholes are decreased in sequence. In particular, the bore diameters of the blowholes43set on the top gas diversion plate3range from 5 mm to 10 mm, and the bore diameters of Blowholes41set on Bottom Gas Diversion Plate1range from 0.2 mm to 0.6 mm, such as 0.2 mm, 0.3 mm, 0.4 mm, 0.5 mm, 0.6 mm. The bore diameters of Blowholes42set on Middle Gas Diversion Plate2is between the bore diameters of Blowholes43set on Top Gas Diversion Plate3and the bore diameters of Blowholes41set on Bottom Gas Diversion Plate1.

The operation principle of the upper electrode device in the embodiment will be further illustrated based on the figures.

As shown inFIG. 2, when the gas for coating passes into the splitter chamber through the gas inlet set on the top of the upper electrode device, the gas gradually fulfills Top Unit Chamber13. When the gas is introduced into the splitter chamber continuously, the gas in Top Unit Chamber13will be squeezed to Second Unit Chamber12through Blowholes43set on Top Gas Diversion Plate3. Likewise, the gas gradually fulfills Second Unit Chamber12, than the gas will be squeezed to First Unit Chamber11through Blowholes42set on Middle Gas Diversion Plate2. The gas gradually fulfills First Unit Chamber11and passes out of the upper electrode device through Blowholes41set on Bottom Gas Diversion Plate1for coating film on the surface of the object below.

During the process, as the bore diameters of the blowholes set on the gas diversion plates where the gas passes through are gradually decreased, the distribution of the gas will be more uniform when the gas has passed through a gas diversion plate into another unit chamber. After the diversion for several times, the uniformity of the distribution of the gas is greatly promoted. Moreover, the density of Blowholes41in the perimeter area of Bottom Gas Diversion Plate1is 1.1 to 1.2 times of the density of the blowholes41in the center area of Bottom Gas Diversion Plate1which is the last gas diversion plate that the gas passes through, which makes the gas not easily be obstructed in the perimeter area of Bottom Gas Diversion Plate1when passing through. Consequently, the surface of the object below can be coated with the smooth flow of the gas and the thickness of the film coated can be more uniform.

In conclusion, the present disclosure starts from the problem occurs in the usage of the upper electrode device in film coating system. Based on the problem that the gas is easily obstructed in the perimeter area of the last gas diversion plate when passing through and the problem that the distribution of the gas for coating is not uniform causing the uniform thickness of the film, the present disclosure provides the technical solution of setting at least three gas diversion plates in the upper electrode device. Moreover, from the top to the bottom, a plurality of blowholes are set on each gas diversion plate, and the bore diameter of the blowholes on the gas diversion plate below is smaller than that of the blowholes on the gas diversion plate above, which makes the gas more uniform when passing through the gas diversion plate. The density of the blowholes in the perimeter area of the bottom gas diversion plate is larger than the density of the blowholes in the center area of the bottom gas diversion plate, which makes the distribution of the gas more uniform. Consequently, the problem in the related art that the distribution of the gas is not uniform can be solved.

Hence, the upper electrode device in the present disclosure can effectively solve the problem of the uniformity of the distribution of the gas for coating, especially the problem of the uniformity of the distribution of the gas in the edge and corners of the gas diversion plate.