A coating method for a mobile phone back panel with five coating surfaces

Abstract

The present invention discloses a coating method for a mobile phone back plate with five coating surfaces, wherein the mobile phone back plate is rectangular and has four sides, namely, two long sides and two short sides. A revolution plate is arranged in a coating room for coating the mobile phone back plate, and a plurality of coating fixtures are installed around the center of the revolution plate. The mobile phone back plate to be coated is hung on the coating fixture; during the coating process, the coating fixture and the mobile phone back plate thereon are made to revolve together through the revolution plate, and the mobile phone back plate is made to rotate along its symmetry center and swing in different directions and angles through the coating fixture, so that the side of the mobile phone back plate is tilted toward the target surface in turn for coating, and finally uniform coating is achieved. The present invention tilts the side of the mobile phone back plate toward the target surface in turn, so as to achieve better uniform coating of the mobile phone back plate with five coating surfaces.

Description

Technical Field

[0001] The invention relates to the technical field of coating of a mobile phone back plate with five coating surfaces, and in particular to a coating method suitable for a mobile phone back plate with five coating surfaces. Background Art

[0002] Mobile phones have become an indispensable communication tool for people in modern life, and mobile phone products are constantly being updated. In addition to the continuous upgrading of functions, the appearance of mobile phones, especially the colors, are rich and colorful, from imitation gold, imitation rose gold, black, black with blue, etc., and gradually develop into blue, pink, green, fantasy colors, gradient colors, etc.

[0003] The color of a mobile phone is related to the film layer of its shell. Currently, the film layer of a mobile phone shell is mostly prepared by magnetron sputtering reactive coating technology, or ion plating technology. The colors displayed by ion plating are mainly divided into two categories: the original color of the film layer and the interference color of the film layer. The former is an opaque film layer, and its color is determined by the composition and structure of the film layer; the latter is a transparent or translucent film layer, and its color is the interference color generated by the refractive index and film thickness of the film layer. At present, the color of the opaque film layer that can be synthesized by ion plating is not rich enough. Some manufacturers use the interference color of the transparent film superimposed on the original color of the opaque film to obtain richer colors. Whenever interference color development is used, it is related to the film thickness.

[0004] The mobile phone casing is basically a special-shaped workpiece with a complex appearance. During the coating process, the target plasma emitted from the sputtering target surface is fired at the surfaces of the special-shaped workpiece in different directions. Due to the different incident angles, the target-substrate distance is also different, which will inevitably affect the different deposited film thicknesses and lead to different interference colors. This is a difficult problem currently encountered by the industry and must be solved as soon as possible. The solution to this problem is generally achieved by improving the workpiece hanger. A fixture has been developed that can automatically move back and forth to keep the surface to be plated of the workpiece with a constant target / substrate distance. A fixture has also been developed that can tilt the surface to be plated of the workpiece to change the incident angle with the target surface. The above-mentioned improved fixture has a certain improvement effect on the plating of the mobile phone middle frame, but it cannot fully meet the coating requirements of more complex mobile phone cover plates.

[0005] Recently, it is required to coat interference film on the back cover of mobile phones with four sides. The back cover of the mobile phone is rectangular, with a large flat surface, narrow side surfaces, two short and two long sides, and four corners with arc transitions. The outward surface is the surface to be plated, that is, there are five surfaces to be plated in different directions. In the coating of interference film, it is quite difficult to ensure that all the surfaces to be plated of the above-mentioned back cover can be deposited evenly. Because it is affected by many factors, including the target-base distance of the plated surface, the incident angle, the time of crossing the target surface, and the non-conformal effect of the plasma sheath. Therefore, it is necessary to design a fixture suitable for the above-mentioned back cover of the mobile phone. It is necessary to make the fixture rotate and swing at the same time to make multi-dimensional motion. This will inevitably complicate the fixture and reduce the load of the workpiece. For the above-mentioned back cover of the mobile phone with four sides, we propose a multi-dimensional motion coating technology solution to solve the problem of uniform coating. Summary of the invention

[0006] The purpose of the present invention is to provide a coating method for a mobile phone back plate with five coating surfaces, which can coat the mobile phone back plate with five coating surfaces more uniformly.

[0007] The purpose of the present invention is achieved through the following technical solutions:

[0008] A coating method for a mobile phone back panel with five coating surfaces, wherein the mobile phone back panel is rectangular and has four sides, namely, two long sides and two short sides, and is characterized in that: a revolution disk is arranged in a coating room for coating the mobile phone back panel, and a plurality of coating fixtures are installed on the revolution disk around its center, and the mobile phone back panel to be coated is hung on the coating fixture; during the coating process, the coating fixture and the mobile phone back panel thereon are made to revolve together through the revolution disk, and at the same time, the mobile phone back panel is made to rotate along its symmetry center and swing in different directions and angles through the coating fixture, so that the sides of the mobile phone back panel are tilted toward the target surface for coating in turn, and finally uniform coating is achieved.

[0009] Furthermore, the coating fixture is fixedly installed on the revolving disk; during the coating process, when the short side of the back panel of the mobile phone rotates to the upper part or the lower part, the coating fixture drives the back panel of the mobile phone to swing, so that the upper part of the back panel of the mobile phone tilts forward and the lower part tilts backward, or the lower part tilts forward and the upper part tilts backward, and the back panel of the mobile phone tilts at a first angle; when the long side of the back panel of the mobile phone rotates to the upper part or the lower part, the coating fixture drives the back panel of the mobile phone to swing, so that the upper part of the back panel of the mobile phone tilts forward and the lower part tilts backward, or the lower part tilts forward and the upper part tilts backward, and the back panel of the mobile phone tilts at a second angle; the second angle is equal to or greater than the first angle.

[0010] Furthermore, the coating fixture is installed on the rotating disk through a translation bracket, and the translation bracket can drive the mobile phone back panel to translate forward and backward; during the coating process, when the short side of the mobile phone back panel rotates to the upper side or the lower side, the coating fixture drives the mobile phone back panel to swing, so that the upper part of the mobile phone back panel tilts forward and the lower part tilts backward, or the lower part tilts forward and the upper part tilts backward, and the mobile phone back panel tilts at a first angle; when the long side of the mobile phone back panel rotates to the upper side or the lower side, the coating fixture drives the mobile phone back panel to swing, so that the upper part of the mobile phone back panel tilts forward and the lower part tilts backward, or the lower part tilts forward and the upper part tilts backward, and the mobile phone back panel tilts at a second angle;

[0011] The second angle is equal to the first angle, and when the long side of the back panel of the mobile phone is rotated upward or downward, the back panel of the mobile phone is moved forward by the translation bracket, so that the back panel of the mobile phone is closer to the target surface.

[0012] Furthermore, during the coating process, the coating fixture drives the back panel of the mobile phone to swing, so that one of the upper and lower parts of the back panel of the mobile phone swings forward and tilts, and at the same time, one of the left and right parts of the back panel of the mobile phone also swings forward and tilts, so that each time the two sides of the back panel of the mobile phone are tilted toward the target surface at the same time.

[0013] Furthermore, when the short side of the back panel of the mobile phone rotates to the forward tilted position, the tilt angle of the back panel of the mobile phone is a third angle, and the tilt angle of the back panel of the mobile phone is maintained at a fourth angle at other times; the fourth angle is equal to or greater than the third angle.

[0014] Furthermore, each time the coating fixture moves from a previous target position to a next target position, or each time it completes one revolution and enters the next revolution, the back panel of the mobile phone also changes its tilt direction accordingly.

[0015] Furthermore, the coating fixture includes a revolving workpiece frame, a fixture bracket, a rotating mechanism, an angle adjustment mechanism, a universal joint and a product hanging plate. The fixture bracket is directly supported by the revolving workpiece frame, or supported by a translation bracket slidably installed on the revolving disk. The rotating mechanism and the angle adjustment mechanism are both installed on the fixture bracket. The rotating output shaft of the rotating mechanism is connected to the symmetry center of the back of the product hanging plate through a universal joint. The rotating mechanism can drive the product hanging plate to rotate. The angle adjustment mechanism includes a plurality of telescopic components, which are arranged around the rotating output shaft. The back of the product hanging plate is pushed by the telescopic components, so that the product hanging plate swings along with the movable joint of the universal joint.

[0016] Furthermore, telescopic components are arranged on the four sides of the rotating output shaft respectively, and the telescopic components include a telescopic motor and a telescopic rod. The telescopic rod is slidably arranged on the clamp bracket, and the telescopic motor drives the telescopic rod to perform telescopic movement. The end of the telescopic rod is against the back of the product hanging plate, and the product hanging plate can be swung in different directions and angles through the telescopic cooperation of the telescopic rod.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] During the coating process, the present invention realizes the common revolution of the coating fixture and the mobile phone back plate thereon through the revolution plate, and at the same time, the coating fixture realizes the self-rotation of the mobile phone back plate and the swinging in different directions and angles, so that the mobile phone back plate can perform multi-dimensional movement. During the self-rotation and swinging of the mobile phone back plate, the side surfaces of the mobile phone back plate can be tilted toward the target surface in turn for coating, so that the mobile phone back plate with five coating surfaces can be better coated evenly. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is a cross-sectional schematic diagram of a coating fixture according to Embodiment 1 of the present invention;

[0020] Figure 2 1 is a three-dimensional schematic diagram of a coating fixture according to a first embodiment of the present invention, in which a rotating driving component is hidden;

[0021] Figure 3 1 is a schematic rear view of a coating fixture according to the first embodiment of the present invention, in which the rotating drive component is hidden;

[0022] Figure 4 1 is a top view schematic diagram of a coating fixture according to a first embodiment of the present invention, in which the rotating driving component is hidden;

[0023] Figure 5 is a cross-sectional schematic diagram of a coating fixture according to a second embodiment of the present invention;

[0024] Figure 6 It is a schematic diagram of the area and space division when the back panel of the mobile phone is upright;

[0025] Figure 7 This is a schematic diagram of the area and space division when the back panel of the mobile phone is horizontal;

[0026] Figure 8 It is a schematic diagram of the plane coordinates of the rotation of the back panel of a mobile phone formed by division;

[0027] Fig. 9 This is one of the schematic diagrams of the rotation position of the back plate of a mobile phone in the coating method of an embodiment of the invention;

[0028] Fig.10 This is the second schematic diagram of the rotation position of the back plate of a mobile phone in the coating method of the embodiment of the invention;

[0029] Fig.11 This is the third schematic diagram of the rotation position of the back plate of a mobile phone in the coating method of the embodiment of the invention;

[0030] Fig.12 This is the fourth schematic diagram of the rotation position of the back plate of a mobile phone in the coating method of the embodiment of the invention;

[0031] Fig.13 This is the fifth schematic diagram of the rotation position of the back plate of a mobile phone in the coating method of the embodiment of the invention;

[0032] Fig.14 This is the sixth schematic diagram of the rotation position of the back plate of a mobile phone in the coating method of the embodiment of the invention;

[0033] Fig.15 This is the seventh schematic diagram of the rotation position of the back plate of a mobile phone in the coating method of the embodiment of the invention;

[0034] Fig.16 This is the eighth schematic diagram of the rotation position of the back plate of a mobile phone in the coating method of the embodiment of the invention;

[0035] Fig.17 This is the ninth schematic diagram of the rotation position of the back panel of a mobile phone in the coating method of an embodiment of the invention.

[0036] Meaning of reference numerals in the figure:

[0037] 1-screw; 2-slider; 3-telescopic motor; 4-product hanging plate; 5-telescopic rod; 6-universal joint; 7-second bevel gear; 8-second deep groove ball bearing; 9-elastic retaining ring for second shaft; 10-elastic retaining ring for second hole; 11-support plate; 12-first bevel gear; 13-first deep groove ball bearing; 14-elastic retaining ring for first hole; 15-gear bracket; 16-elastic retaining ring for first shaft; 17-hanging rod; 18-dust cover; 19-elastic retaining ring for fourth hole Retaining ring; 20-hexagonal bolt; 21-sleeve; 22-bearing seat; 23-third deep groove ball bearing; 24-elastic retaining ring for the third hole; 25-rotating shaft; 26-rotating gear; 27-flat key; 28-washer; 29-hexagonal nut; 30-revolving plate; 31-middle support plate; 32-upper turntable; 33-oil-free bushing; 34-round head; 35-rotating output shaft; 36-mobile phone back plate; 37-upper translation plate; 38-middle translation plate; 39-lower translation plate. DETAILED DESCRIPTION

[0038] The present invention is further described below in conjunction with embodiments.

[0039] In the description of the present invention, it should be understood that descriptions involving orientations, such as up, down, front, back, left, right, etc., and orientations or positional relationships indicated are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0040] In the description of the present invention, "several" means one or more, "more" means more than two, "greater than", "less than", "exceed" etc. are understood as not including the number itself, and "above", "below", "within" etc. are understood as including the number itself. If there is a description of "first" or "second", it is only used for the purpose of distinguishing the technical features, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0041] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0042] The coating method of the present invention is applicable to a mobile phone back plate with five coating surfaces, wherein the mobile phone back plate 36 to be coated is rectangular, has four sides, namely, two long sides and two short sides, and four corners are arc transitions. Therefore, the mobile phone back plate 36 has five coating surfaces to be coated, namely, four side surfaces and one back surface.

[0043] The coating method of the present invention provides a revolution disk 30 in a coating room for coating the mobile phone back panel 36, and a plurality of coating fixtures are installed around the center of the revolution disk 30, and the mobile phone back panel to be coated is hung on the coating fixture; during the coating process, the coating fixture revolves together with the revolution disk 30, and at the same time, the mobile phone back panel is rotated and swung in different directions and angles through the coating fixture, so that the side surfaces of the mobile phone back panel 36 are tilted toward the target surface for coating in turn, so that the mobile phone back panel 36 with five coating surfaces can be better coated evenly.

[0044] The specific embodiments of the coating method of the present invention will be described below.

[0045] Since the mobile phone back plate 36 is rectangular and has four sides, the mobile phone back plate 36 can rotate around its symmetry center during coating, and can also swing back and forth and left and right. The movement posture is relatively complex. The directions and distances of various parts of the mobile phone back plate 36 to the target surface are different. For the convenience of description, the mobile phone back plate 36 is first divided and numbered, and the space where the mobile phone back plate 36 is located is also divided and numbered. The specific process is as follows:

[0046] like Figure 6 As shown, first, the back plate 36 of the mobile phone is erected with one short side facing upwards, and two diagonal lines are drawn through the symmetry center of the back plate 36 of the mobile phone, with the symmetry center being O, and the four corner semi-diagonal lines being OA, OB, OC, and OD lines, dividing the back plate 36 of the mobile phone into four triangular areas Ⅰ, Ⅱ, Ⅲ, and Ⅳ. At this time, the space corresponding to the areas Ⅰ, Ⅱ, Ⅲ, and Ⅳ is divided into areas 1, 2, 3, and 4, respectively. Areas 1, 2, 3, and 4 are four fixed space partitions that do not rotate with the mobile phone, and the lines oa, ob, oc, and od are marked in space corresponding to the lines OA, OB, OC, and OD at this time.

[0047] like Figure 7 As shown, the back panel 36 of the mobile phone is placed horizontally with one long side facing upwards. The back panel 36 of the mobile phone is still divided into areas Ⅰ, Ⅱ, Ⅲ, and Ⅳ by semi-diagonal lines OA, OB, OC, and OD. At this time, the space corresponding to areas Ⅰ, Ⅱ, Ⅲ, and Ⅳ is divided into areas 5, 6, 7, and 8, respectively. Areas 5, 6, 7, and 8 are fixed space partitions that do not rotate with the mobile phone. The oe, of, og, and oh lines are marked in space corresponding to the OA, OB, OC, and OD lines at this time.

[0048] Figure 8 It shows the position of the above-mentioned OA, OB, OC, OD, EO, OF, OG, and OH lines together after removing the back panel 36 of the mobile phone, which forms a Figure 8 Shown are the coordinates of the plane on which a mobile phone back panel will rotate.

[0049] Embodiment 1:

[0050] In order to better understand the coating method, a specific coating fixture applicable to the coating method of the first embodiment is first described.

[0051] like Figures 1 to 4 The coating fixture of the present embodiment is suitable for a mobile phone back panel with five coating surfaces, which includes a revolving workpiece frame, a fixture bracket, a rotating mechanism, an angle adjustment mechanism, a product hanging plate 4 and a universal joint 6.

[0052] There is a revolution disk 30 in the coating chamber. When in use, multiple coating fixtures are installed around the revolution disk 30. The coating fixtures are installed on the revolution disk 30 through a revolution workpiece holder. During the coating process, the revolution disk 30 drives the coating fixtures to revolve as a whole. Multiple targets are arranged around the revolution disk 30 in the coating chamber, and the surface of the target facing the revolution disk 30 is the target surface.

[0053] The revolving workpiece frame of this embodiment includes an upper turntable 32 and a middle support plate 31. The upper turntable 32, the middle support plate 31 and the revolving plate 30 are respectively located at the upper, middle and lower positions. The upper turntable 32 and the middle support plate 31 are fixedly connected to the revolving plate 30 through a central axis column (the central axis column is not shown in the figure), and revolve together with the revolving plate 30.

[0054] The fixture bracket of this embodiment includes a gear bracket 15 and a support plate 11. The gear bracket 15 is horizontally arranged and fixedly connected to the middle support plate 31 by bolts. The support plate 11 is vertically fixedly connected to the outwardly extending end of the gear bracket 15.

[0055] The rotating mechanism includes a rotating output shaft 35, a first bevel gear 12, a hanging rod 17, a second bevel gear 7 and a rotating driving component. The first bevel gear 12 is rotatably mounted on the gear bracket 15 through a first deep groove ball bearing 13. The first deep groove ball bearing 13 is limited in the mounting hole through a first hole elastic retaining ring 14. The boss on the first bevel gear 12 abuts against the top of the first deep groove ball bearing 13. The lower end of the first bevel gear 12 is limited by a first shaft elastic retaining ring 16. The second bevel gear 7 is fixed on the rotating output shaft 35. The second bevel gear 7 is rotatably mounted in the middle of the support plate 11 through a second deep groove ball bearing 8. The position of the second deep groove ball bearing 8 is limited by a second hole elastic retaining ring 10. The position of the second bevel gear 7 is limited by a second shaft elastic retaining ring 9. The rotation center axis of the first bevel gear 12 is in a vertical state, and the rotation center axis of the second bevel gear 7 is in a horizontal state. The first bevel gear 12 is meshed with the second bevel gear 7.

[0056] The rotating output shaft 35 is connected to the convex column at the symmetric center of the back of the product hanging plate 4 through the universal joint 6, so that the rotating output shaft 35 can drive the product hanging plate 4 to rotate, and the product hanging plate 4 can also swing freely during the rotation process. The universal joint 6 of this embodiment is a single fixed pin universal joint.

[0057] The hanging rod 17 passes through the first bevel gear 12 and is fixedly connected to the first bevel gear 12. The upper end of the hanging rod 17 passes through the sliding hole on the upper turntable 32. The rotating drive component is installed on the public turntable 30, and the lower end of the hanging rod 17 is connected to the rotating drive component.

[0058] The rotary drive component of this embodiment includes a bearing seat 22, a rotating shaft 25 and a self-rotating gear 26. The bearing seat 22 is fixedly mounted on the male rotating disk 30 by a hexagonal bolt 20. The bearing seat 22 is provided with an inner cavity, in which two third deep groove ball bearings 23 are installed. The two third deep groove ball bearings 23 are separated by a sleeve 21. The third deep groove ball bearing 23 at the upper end passes through a fourth hole elastic circlip 19, and a dust cover 18 is covered on the inner cavity. The rotating shaft 25 passes through the two third deep groove ball bearings 23, and the boss at the upper end of the rotating shaft 25 abuts against the upper third deep groove ball bearing 23 on the upper side. A third hole elastic circlip 24 is also installed on the rotating shaft 25, and the third hole elastic circlip 24 is located below the third deep groove ball bearing 23 on the lower side. The lower end of the hanging rod 17 is inserted into the stepped hole of the rotating shaft 25 for fixed connection. The self-rotating gear 26 is arranged at the lower end of the rotating shaft 25. The boss at the lower end of the rotating shaft 25 abuts against the self-rotating gear 26. The self-rotating gear 26 is locked with the rotating shaft 25 through a flat key 27. The lower end of the rotating shaft 25 is also connected with a washer 28 and a hexagonal nut 29, and the self-rotating gear 26 is fixed by the washer 28 and the hexagonal nut 29. A fixed gear coaxial with the revolving disk 30 is provided in the coating chamber (the fixed gear is not shown in the figure). The fixed gear does not rotate with the revolving disk 30, and the self-rotating gear 26 will mesh with the fixed gear. When the rotating frame drives the coating fixture to revolve as a whole, the self-rotating gear 26 will rotate under the action of the fixed gear, thereby driving the hanging rod 17 to rotate, and then driving the product hanging plate 4 to rotate.

[0059] The angle adjustment mechanism of this embodiment includes four telescopic components, which are respectively mounted on the support plate 11 and can perform telescopic motion independently. The four telescopic components are respectively arranged on the upper, lower, left and right sides of the rotating output shaft 35.

[0060] The telescopic assembly includes a telescopic motor 3, a telescopic rod 5, a screw 1 and a slider 2. An opening is provided on the support plate 11 corresponding to each telescopic assembly. An oil-free bushing 33 is embedded and installed in the opening. The telescopic rod 5 cooperates with the oil-free bushing 33, and the telescopic rod 5 can slide back and forth in the oil-free bushing 33. A round head 34 is provided at the front end of the telescopic rod 5, and the round head 34 is pressed against the back of the product hanging plate 4. When in use, the product hanging plate 4 can be pushed by the telescopic rod 5 to make the product hanging plate 4 swing. When the product hanging plate 4 rotates, the round head 34 will slide relative to the back of the product hanging plate 4. The slider 2 is vertically fixed at the rear end of the telescopic rod 5, and the slider 2 extends outward. An internal threaded hole is provided on the extended part of the slider 2. The telescopic motor 3 is fixedly installed on the side of the support plate 11, next to the telescopic rod 5. The screw 1 is provided at the output end of the telescopic motor 3, and the screw 1 is parallel to the telescopic rod 5. The screw 1 cooperates with the internal threaded hole on the slider 2 for threaded connection. During operation, the lead screw 1 can be driven to rotate by the telescopic motor 3, thereby driving the slider 2 and the telescopic rod 5 to move forward and backward. The product hanging plate 4 can be swung by the telescopic cooperation of the four side telescopic rods 5. For example, the upper telescopic rod 5 extends forward, the telescopic rods 5 on the left and right sides of the middle do not move, and the lower telescopic rod 5 retracts backward, so that the upper part of the product hanging plate 4 can be tilted forward and swung, and the lower part can be tilted backward.

[0061] During the coating process, the mobile phone back panel 36 is mounted on the product hanging plate 4, and the turntable 30 in the coating room will drive multiple coating fixtures and the mobile phone back panel 36 around it to revolve simultaneously. During the revolution, the mobile phone back panel 36 is rotated by the rotating mechanism, and the angle adjustment mechanism drives the product hanging plate 4 to swing so that the sides of the mobile phone back panel 36 are tilted toward the target surface in turn, so as to better and evenly coat the mobile phone back panel 36 with five coating surfaces.

[0062] The following will describe the specific four coating methods of Example 1.

[0063] The first coating method:

[0064] During the coating process, when the short side of the mobile phone back plate 36 rotates upward, the angle adjustment mechanism drives the product hanging plate 4 to swing so that the upper part of the mobile phone back plate 36 tilts forward and the lower part tilts backward. At this time, the mobile phone back plate 36 tilts at a first angle; when the long side of the mobile phone back plate 36 rotates upward, the angle adjustment mechanism drives the product hanging plate 4 to swing so that the upper part of the cover plate tilts forward and the lower part tilts backward. At this time, the mobile phone back plate tilts at a second angle. In this coating method, the first angle and the second angle are both 45°, that is, the side of the mobile phone back plate is tilted at an angle of 45° to the target surface for deposition in turn. The specific operation process can be as follows:

[0065] The telescopic motor 3 on the upper side rotates forward, pushing the telescopic rod 5 on the upper side forward, causing the upper part of the product hanging board 4 to tilt forward; at the same time, the telescopic motor 3 on the lower side rotates in the opposite direction, causing the telescopic rod 5 on the lower side to retreat, causing the lower part of the product hanging board 4 to tilt backward. The telescopic rods 5 on the left and right sides do not move, and are pressed against the horizontal center axis of the product hanging board 4. Finally, the product hanging board 4 is adjusted to have the upper half along the horizontal center axis tilted forward and the lower half tilted backward, tilted 45° toward the target surface. The back panel 36 of the mobile phone that needs to be coated is mounted on the product hanging board 4, and the center points of the two coincide with each other. During coating, the back panel 36 of the mobile phone first rotates counterclockwise along with the product hanging board 4 tilted at a 45° angle. When the back plate 36 of the mobile phone is rotated to the horizontal position of its long central axis, a long side surface is directly above, and the long side surface and the adjacent part are inclined at a 45° angle to the target surface. The two have similar deposition amounts, but the part near the horizontal central axis is far away from the target surface, and the deposition amount is reduced; and there are two short side surfaces on the left and right sides, both of which are in a vertical target surface state, and can only accept oblique incidence and diffraction deposition of particles emitted by the target surface, and the deposition amount is small; the lower part of the back plate 36 of the mobile phone is far away from the target, and the deposition amount is very small; the lower long side surface is facing away from the target, and the deposition amount is even smaller. In the following, as the product hanging plate 4 rotates, the side surfaces on the back plate 36 of the mobile phone will continuously change positions, and each lateral area on each side surface will sequentially pass through the corresponding position, so the deposition amount obtained in the end will be roughly the same and tend to be uniform; and the back of the back plate 36 of the mobile phone is also roughly uniform through rotation scanning deposition.

[0066] The second coating method:

[0067] During the coating process, when the short side of the mobile phone back plate 36 rotates to the top, the angle adjustment mechanism drives the product hanging plate 4 to swing so that the upper part of the mobile phone back plate 36 tilts forward and the lower part tilts backward. At this time, the mobile phone back plate 36 tilts at a first angle; when the long side of the mobile phone back plate 36 rotates to the top, the angle adjustment mechanism drives the product hanging plate 4 to swing so that the upper part of the mobile phone back plate 36 tilts forward and the lower part tilts backward. At this time, the mobile phone back plate 36 tilts at a second angle. However, in this coating method, the first angle is 45°, and the second angle is greater than the first angle, that is, the short side of the mobile phone back plate 36 is tilted at a 45° angle to the target surface for deposition, and the long side is tilted at an interference angle of 45° to the target surface for deposition. The specific operation process can be as follows:

[0068] Taking into account that when the long and short sides are both inclined at 45°, the target-base distance of the long side is farther than that of the short side, and the deposition amount is relatively less. In order to compensate for this difference, when coating on a single side, the short side is still deposited facing the target at a 45° inclination, and when the back panel 36 of the mobile phone is rotated so that the long side faces the target, deposition is performed with an interference of 45°. In this way, the long side is slightly rotated in the direction parallel to the target surface, and a larger deposition amount can be obtained than the 45° inclination, which can make up for the deposition loss due to the farther target-base distance. The interference angle is determined in the plating test. The specific operation is: when the back panel 36 of the mobile phone is rotated so that the OA line of zone Ⅰ is close to the ob line of zone 1 (such as Fig. 9 ), adjust the telescopic assembly on the upper side to make the upper part of the back plate 36 of the mobile phone tilt forward 45 degrees, and keep it until the OB line turns to the OA line position (as shown in the figure). Fig.10 Then adjust the telescopic assembly on the upper side to make the upper part of the back plate 36 of the mobile phone tilt forward by 45 degrees, and keep it until the OC line is close to the ob line (such as Fig.11 Then, the upper part of the mobile phone back plate 36 is restored to a forward tilt of 45 degrees, and this is maintained until the OD line turns to the OA line position (as shown in FIG. Fig.12 The upper telescopic assembly is then adjusted to allow the upper part of the mobile phone back plate 36 to tilt forward by 45 degrees. This is repeated. In order to make the coating conditions at each point equal, when the total coating time is half, the mobile phone back plate 36 is changed from counterclockwise rotation to clockwise rotation, and the above operation is also reversed, that is, each partition of the mobile phone back plate 36 enters and passes through the corresponding fixed space in the opposite direction, so that the unevenness caused by the movement in the first half of the time will be compensated and offset.

[0069] The third coating method:

[0070] During the coating process, the angle adjustment mechanism drives the mobile phone back plate 36 to make its upper part swing forward and tilt, and the left part also swings forward and tilts, so that each time the two sides of the mobile phone back plate 36 tilt toward the target surface, thereby improving the coating efficiency. The specific operation process can be as follows:

[0071] The product hanging plate 4 and the mobile phone back plate 36 mounted thereon are initially in an upright position, and the short side of the mobile phone back plate 36 is in an upper and lower position. First, the telescopic motor 3 located on the upper side and the left side is started to extend the telescopic rod 5 forward, pushing the upper part of the mobile phone back plate 36 to tilt forward and the left part to turn right, that is, the left part also tilts forward, and at the same time, the telescopic motor 3 located on the lower side and the right side is started to make the telescopic rod 5 retreat, so that the lower part of the mobile phone back plate 36 can adapt to the forward tilt of its upper part and tilt backward to make way, and at the same time, in order to adapt to the right turn of the left part of the mobile phone back plate 36, the right part of the mobile phone back plate 36 follows the right turn, and the telescopic rod 5 on the right side retreats to make way. The upper side of the mobile phone back plate 36 is set to tilt forward 45 degrees and the left side to turn right 45 degrees. Accordingly, the lower side of the mobile phone back plate 36 is tilted backward at an angle of 135 degrees to the target surface, and the right side is turned right at an angle of 135 degrees to the target surface, and both are facing away from the target surface. Through the rotation of the back plate 36 of the mobile phone, each side and the rear back plate surface have the opportunity to face the target surface at a 45-degree forward tilt for deposition. At this time, relative to the target surface, the upper side of the back plate 36 of the mobile phone is tilted forward 45 degrees and the left side is turned right 45 degrees, that is, it is inclined to the target surface and close to the target surface; while the lower side of the back plate 36 of the mobile phone is tilted back 45 degrees and the right side is turned right 45 degrees. The lower side and the right side are in a backward state, away from and obliquely facing the target surface, and can only rely on diffraction deposition, and the deposition amount will be relatively small. However, in the following, with the rotation of the back plate 36 of the mobile phone, the four sides of the back plate 36 of the mobile phone and the upper and lower parts of the back surface constantly change direction and position, so that different positions can have equal opportunities to face the target surface, and each surface is in an inclined state, especially the four sides have the opportunity to face the target surface at a close distance at a 45-degree angle, so in general, the deposition uniformity everywhere is relatively close.

[0072] The fourth coating method:

[0073] During the coating process, the angle adjustment mechanism drives the back plate 36 of the mobile phone so that its upper part swings forward and tilts, and the left part also swings forward and tilts, so that the two side surfaces of the back plate 36 of the mobile phone are tilted toward the target surface each time. When the short side surface of the back plate 36 of the mobile phone rotates to the forward tilting position, the tilt angle of the back plate 36 of the mobile phone is the third angle, and the tilt angle of the back plate 36 of the mobile phone is maintained at the fourth angle at all other times, and the fourth angle is greater than the third angle. The third angle of this embodiment is 45 degrees, and the fourth angle is an interference of 45 degrees (i.e., greater than 45 degrees), so that the long side surface of the back plate 36 of the mobile phone can be tilted toward the target surface at a larger angle for coating, thereby compensating for the difference in target-base distance between the long and short sides, and making the coating more uniform. The specific operation process can be as follows:

[0074] The four sides of the mobile phone back plate 36 receive plasma deposition emitted from the target surface mainly at the position of 45 degrees forward tilt and 45 degrees right turn. For the same side rotated to the top, due to the relationship of forward tilt and right turn, the left end of the side is closer to the target surface than the right end, so the deposition amount obtained at the left end is more than that at the right end; similarly, when the same side is rotated to the left position, the upper part tilts forward and the lower part tilts backward, and the deposition amount of the upper part is also more than that of the lower part. However, due to the rotation of the mobile phone back plate 36, the above-mentioned left and right parts and the upper and lower parts will all experience the same deposition path process, and the deposition opportunities are similar, and the deposition amount will be flattened. However, considering that the long and short sides are tilted to the target surface at the same 45-degree angle, because the respective target / base distances are different, for example, when the long and short sides are tilted forward at the top, the short side will be closer to the target than the long side, and similarly, when the left part of the two is tilted at 45 degrees right, the short side will be closer to the target than the long side, so the deposition amount of the short side will be larger. When calculating the deposition amount more accurately, the deposition on the short side is slightly more than that on the long side. In order to compensate for the difference in deposition amount caused by the difference in target / substrate distance, the short side is inclined at 45 degrees and the long side is inclined at slightly more than 45 degrees. In this way, the long side can be more parallel to the target surface relative to the short side, which is more conducive to receiving more deposition particles emitted from the target surface, making the deposition on the long and short sides more uniform.

[0075] Due to the rotation of the mobile phone back panel 36, zones Ⅰ, Ⅱ, Ⅲ, and Ⅳ on the mobile phone back panel 36 will continuously change positions in the above-mentioned 1-4 (5-8) fixed space partitions, and the inclination angles of the long and short sides can be driven and adjusted in time to achieve more uniform deposition. The specific operation is as follows: At the beginning, the upper part of the mobile phone back panel 36 is tilted forward 45 degrees, and the left part of the mobile phone back panel 36 turns right 45 degrees along the central axis. The mobile phone back panel 36 first rotates counterclockwise, and the partitions of the mobile phone back panel 36 enter and pass through the corresponding fixed space partitions in sequence. At this time, the inclination states of the partitions on the mobile phone back panel 36 entering and passing through the fixed space partitions are adjusted respectively. When the area where the short side is located enters the fixed space of zone 1, that is, when the OA line is close to the ob line (such as Fig.13 The forward tilt angle of the upper portion of the mobile phone back plate 36 is maintained at 45 degrees until the OB line leaves the oa line (as shown in FIG. Fig.14 In addition, when the OA line enters zone 5, that is, when the OA line is close to the OF line, the left part of the back plate 36 of the mobile phone keeps turning right at an angle of 45 degrees until the OB line leaves the oe line (as shown in FIG. Fig.17As shown in the position). Correspondingly, when the III zone of the mobile phone back plate 36 enters and passes through the fixed space of zones 1 and 5, it is adjusted as described above to maintain an inclination of 45 degrees. That is to say, when the short side passes through the fixed space of zones 1 and 5, the inclination is 45 degrees throughout the whole process, and in the rest of the operation time, the upper part and the left part of the mobile phone back plate 36 are both inclined at an interference angle of 45 degrees toward the target surface, that is, this period of time is more conducive to the deposition of the long side, so that the deposition loss of the long side slightly away from the target can be compensated, and the uniformity of the coating can be improved.

[0076] Embodiment 2:

[0077] In order to better understand the coating method, a specific coating fixture applicable to the coating method of the second embodiment is described here.

[0078] The coating fixture of the second embodiment differs from that of the first embodiment in the revolving workpiece frame and the rotating driving component.

[0079] like Figure 5 As shown, the revolution workpiece rack of the second embodiment includes a translation bracket, and a translation bracket is respectively set corresponding to each fixture bracket, that is, the translation bracket drives the fixture bracket and its upper components to translate back and forth toward the target surface, and the forward and backward translation of each fixture bracket can be performed independently. The revolution disk 30 in the coating chamber is still retained, and the translation bracket is installed on the revolution disk 30, and is driven by the revolution disk 30 to revolve together. (The second embodiment of Figure 5 The rotating disk 30, the self-rotating servo motor and the sliding mechanism are not shown.

[0080] The upper, middle and lower positions of the translation bracket of this embodiment are respectively provided with an upper translation plate 37, a middle translation plate 38 and a lower translation plate 39, which are connected together by separate columns and are integrally mounted on the public rotating disk 30 through a sliding mechanism, and the sliding mechanism is driven by a driving device of the sliding mechanism to drive the translation bracket to translate forward and backward. The sliding mechanism adopts a conventional slide rail mechanism, which is driven by respective servo motors to perform translational motion.

[0081] The rotating mechanism of this embodiment includes a first bevel gear 12, a hanging rod 17, a second bevel gear 7 and a rotating drive component, wherein the rotating drive component includes a bearing seat 22, a rotating shaft 25 and a self-rotating servo motor, and the self-rotating gear 26 of the first embodiment is replaced by a self-rotating servo motor. The self-rotating servo motor allows the self-rotating speed of the mobile phone back plate 36 on the product hanging plate 4 to be independently controlled, and is no longer controlled by the revolution speed as in the first embodiment. The solution of replacing the self-rotating gear 26 with a self-rotating servo motor can save the cost of fixing the large gear.

[0082] The gear bracket 15 is fixed on the middle translation plate 38, and the installation of the first bevel gear 12 and the second bevel gear 7 is the same as that of the first embodiment, the first bevel gear 12 is rotatably mounted on the gear bracket 15, the second bevel gear 7 is arranged on the rotation output shaft 35, and the first bevel gear 12 is meshed with the second bevel gear 7. The hanging rod 17 passes through the first bevel gear 12 and is fixedly connected to the first bevel gear 12, and the upper end of the hanging rod 17 passes through the sliding hole on the upper translation plate 37.

[0083] The rotating shaft 25 of the rotating driving component is installed on the lower translation plate 39 through the bearing seat 22. The upper end of the rotating shaft 25 is connected to the hanging rod 17. The self-rotating servo motor is fixedly installed under the lower translation plate 39 and connected to the lower end of the rotating shaft 25. The rotating shaft 25 and the hanging rod 17 are driven to rotate by the self-rotating servo motor.

[0084] The coating method of the second embodiment is:

[0085] During the coating process, when the short side of the mobile phone back panel 36 rotates upward, the angle adjustment mechanism drives the product hanging plate 4 to swing so that the upper part of the mobile phone back panel 36 tilts forward and the lower part tilts backward; when the long side of the mobile phone back panel 36 rotates upward, the angle adjustment mechanism drives the product hanging plate 4 to swing so that the upper part of the mobile phone back panel 36 tilts forward and the lower part tilts backward, and at this time, the clamp bracket and the components thereon are driven to move forward as a whole through the translation bracket, so that the mobile phone back panel 36 is closer to the target surface. In this coating method, the short side and the long side of the mobile phone back panel 36 are deposited at an angle of 45° to the target surface in turn, but when the long side is deposited at an angle of 45° to the target surface, the clamp bracket and the components thereon are driven to move forward as a whole through the translation bracket, thereby compensating for the difference in target-base distance between the long and short sides, so that the coating is uniform. The specific operation process can be as follows:

[0086] When the short side rotates to the top, the upper part of the mobile phone back panel 36 tilts forward and the lower part tilts backward, tilting forward at a 45-degree angle to the target surface. At this time, the mobile phone back panel 36 is at the best target-base distance (the best target-base distance is determined by experiments). This is used as a reference to adjust the subsequent forward position of the mobile phone back panel 36. When the mobile phone back panel 36 rotates to its long side to the top, the mobile phone back panel 36 still maintains the upper part tilting forward and the lower part tilting backward, tilting forward at a 45-degree angle to the target surface. At this time, the clamp bracket and the components thereon are driven to move forward as a whole through the translation bracket, so that the mobile phone back panel 36 is closer to the target surface to compensate for the difference in the target-base distance between the long and short sides. The specific operation is as follows: The mobile phone back panel 36 always maintains the upper part tilting forward and the lower part tilting backward, tilting forward at a 45-degree angle to the target surface. When the mobile phone back panel 36 rotates counterclockwise until the OA line is close to the ob line (such as Fig.13 The front and rear positions of the mobile phone back plate 36 are at the optimal target base distance, and the mobile phone back plate 36 continues to rotate until the OB line leaves the oa line (as shown in FIG. Fig.14The fixture bracket and its components are then driven to move forward as a whole until the long side is at the optimal target-base distance position, and the mobile phone back panel 36 continues to rotate until the OC line is close to the fixed space ob line (such as Fig.15 The mobile phone back plate 36 continues to rotate until the OD line leaves the fixed space oa line position (as shown in the figure). Fig.16 The process is repeated. In order to make the coating conditions at each point equal, when the total coating time is half, the rotating disk 30 changes from counterclockwise rotation to clockwise rotation, and the above operation is also reversed, that is, each partition of the back plate 36 of the mobile phone enters and passes through the corresponding fixed space in the opposite direction, so that the unevenness caused by the movement in the first half of the time can be compensated and offset.

[0087] Embodiment three:

[0088] The coating method of the third embodiment is:

[0089] Each time the coating fixture moves from the previous target position to the next target position, or each time it completes a circle and enters the next circle, the mobile phone back plate 36 also changes its tilt direction accordingly. The specific operation process may be as follows:

[0090] In order to achieve more uniform deposition conditions, after the mobile phone back plate 36 leaves the first target position, the original tilt direction of the mobile phone back plate 36 is changed from the upper part of the mobile phone back plate 36 tilting forward, the left part turning right, the lower part leaning back, and the right part turning right, to the tilt direction of the lower part tilting forward, the right part turning left, the upper part leaning back, and the left part turning left, and then the second target position is entered after the tilt direction is changed. In the future, the tilt direction is changed once each time from the previous target position to the next target position to make the coating of the mobile phone back plate more uniform. Another way is also: after the mobile phone back plate 36 revolves in one tilt direction for one circle, before entering the second circle, the tilt direction of the mobile phone back plate 36 is changed, and the tilt direction is changed once after each circle of plating, which will also be more conducive to uniform coating.

[0091] The coating methods of the above-mentioned embodiments 1 to 3 can be used in combination according to actual needs.

[0092] The above embodiments of the present invention are not intended to limit the protection scope of the present invention, and the implementation modes of the present invention are not limited thereto. All other modifications, replacements or changes made to the above structures of the present invention based on the above contents of the present invention, in accordance with common technical knowledge and customary means in the art, without departing from the above basic technical ideas of the present invention, should fall within the protection scope of the present invention.

Claims

1. A coating method for a mobile phone back plate with five coating surfaces, wherein the mobile phone back plate is rectangular and has four sides, namely, two long sides and two short sides, characterized in that: A revolution plate is arranged in a coating chamber for coating the back plate of a mobile phone, and a plurality of coating fixtures are installed around the center of the revolution plate, and the back plate of the mobile phone to be coated is hung on the coating fixture; during the coating process, the coating fixture and the back plate of the mobile phone on it are made to revolve together through the revolution plate, and the back plate of the mobile phone is made to rotate along its symmetry center and swing in different directions and angles through the coating fixture, so that the side of the back plate of the mobile phone is tilted toward the target surface in turn for coating, and finally a uniform coating is achieved; The coating fixture is installed on the rotating disk through a translation bracket, and the translation bracket can drive the back panel of the mobile phone to translate forward and backward; during the coating process, when the short side of the back panel of the mobile phone rotates to the upper side or the lower side, the coating fixture drives the back panel of the mobile phone to swing, so that the upper part of the back panel of the mobile phone tilts forward and the lower part tilts backward, or the lower part tilts forward and the upper part tilts backward, and the back panel of the mobile phone tilts at a first angle; when the long side of the back panel of the mobile phone rotates to the upper side or the lower side, the coating fixture drives the back panel of the mobile phone to swing, so that the upper part of the back panel of the mobile phone tilts forward and the lower part tilts backward, or the lower part tilts forward and the upper part tilts backward, and the back panel of the mobile phone tilts at a second angle; The second angle is equal to the first angle, and when the long side of the mobile phone back panel is rotated upward or downward, the mobile phone back panel is moved forward by the translation bracket, so that the mobile phone back panel is closer to the target surface.

2. The coating method according to claim 1, characterized in that: During the coating process, the coating fixture drives the back panel of the mobile phone to swing, so that one of the upper and lower parts of the back panel of the mobile phone swings forward and tilts, and at the same time, one of the left and right parts of the back panel of the mobile phone also swings forward and tilts, so that each time the two side surfaces of the back panel of the mobile phone are tilted toward the target surface at the same time.

3. The coating method according to claim 1, characterized in that: Each time the coating fixture moves from a previous target position to a next target position, or each time it completes one revolution and enters the next revolution, the back panel of the mobile phone also changes its tilt direction accordingly.

4. The coating method according to claim 1, characterized in that: The coating fixture includes a revolving workpiece frame, a fixture bracket, a rotating mechanism, an angle adjustment mechanism, a universal joint and a product hanging plate. The fixture bracket is directly supported by the revolving workpiece frame, or supported by a translation bracket slidably installed on the revolving disk. The rotating mechanism and the angle adjustment mechanism are both installed on the fixture bracket. The rotating output shaft of the rotating mechanism is connected to the symmetry center of the back side of the product hanging plate through the universal joint. The rotating mechanism can drive the product hanging plate to rotate. The angle adjustment mechanism includes a plurality of telescopic components, which are arranged around the rotating output shaft. The back side of the product hanging plate is pushed by the telescopic components, so that the product hanging plate swings along with the movable joint of the universal joint.

5. The coating method according to claim 4, characterized in that: The telescopic components are arranged on four sides of the rotating output shaft respectively, and the telescopic components include a telescopic motor and a telescopic rod. The telescopic rod is slidably arranged on the clamp bracket, and the telescopic motor drives the telescopic rod to perform telescopic movement. The end of the telescopic rod abuts against the back side of the product hanging plate, and the product hanging plate can be swung in different directions and angles through the telescopic cooperation of the telescopic rod.

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