阅读说明：本技术 多通路式蒸发源 (Multi-channel evaporation source ) 是由 艾金虎 于 2020-07-03 设计创作，主要内容包括：本发明提供了一种多通路式蒸发源,所述多通路式蒸发源包括：多组独立蒸发通道,被配置为分别对镀膜对象提供蒸发操作；集成罩,被配置为将所述多组独立蒸发通道的顶端集成在一封闭空间内,所述多组独立蒸发通道通过其顶端将蒸发的靶材传送至所述镀膜对象；组合挡板,被配置为位于所述集成罩与所述镀膜对象之间,通过开启动作和关闭动作,使所述多组独立蒸发通道与所述镀膜对象之间连通或隔断；安装法兰,被配置为将所述多组独立蒸发通道与挡板驱动集成在一起；挡板驱动,被配置为控制并驱动所述组合挡板的开启动作和关闭动作。(The invention provides a multi-pass evaporation source, comprising: a plurality of groups of independent evaporation channels configured to provide evaporation operation to the film-coated object, respectively; an integrated cover configured to integrate the top ends of the plurality of groups of independent evaporation channels, which deliver the evaporated target to the coating object through the top ends thereof, in a closed space; the combined baffle is configured to be positioned between the integrated cover and the film coating object, and the plurality of groups of independent evaporation channels are communicated or separated from the film coating object through opening and closing actions; a mounting flange configured to integrate the plurality of sets of independent evaporation channels with a baffle drive; a shutter drive configured to control and drive opening and closing motions of the combined shutter.)

1. A multi-pass evaporation source, comprising:

a plurality of groups of independent evaporation channels configured to provide evaporation operation to the film-coated object, respectively;

an integrated cover configured to integrate the top ends of the plurality of groups of independent evaporation channels, which deliver the evaporated target to the coating object through the top ends thereof, in a closed space;

the combined baffle is configured to be positioned between the integrated cover and the film coating object, and the plurality of groups of independent evaporation channels are communicated or separated from the film coating object through opening and closing actions;

a shutter drive configured to control and drive opening and closing motions of the combined shutter;

a mounting flange configured to integrate the plurality of sets of independent evaporation channels with the baffle drive.

2. The multi-pass evaporation source of claim 1, wherein the states between the sets of independent evaporation channels and the coating object include:

the multiple groups of independent evaporation channels are communicated with the film coating object;

the multiple groups of independent evaporation channels are isolated from the film coating object;

one or more of the independent evaporation channels are communicated with the film coating object;

one or more of the independent evaporation channels are isolated from the coating object.

3. The multi-pass evaporation source of claim 1, wherein the combined baffle comprises a first baffle and a second baffle, wherein:

the first baffle and the second baffle are overlapped, the bottom surface of the second baffle is over against the top ends of the multiple groups of independent evaporation channels, and the top surface of the first baffle is over against the coating object;

the first baffle and the second baffle are provided with a plurality of openings;

the number of the openings is set according to the number of the independent evaporation channels;

when the open pore of the first baffle plate and the open pore of the second baffle plate are superposed above the top end of one independent evaporation channel, the independent evaporation channel is communicated with the film coating object, otherwise, the independent evaporation channel is separated from the film coating object.

4. The multi-pass evaporation source of claim 3, wherein each set of independent evaporation channels comprises a filament, a crucible support, a moving device, and a high-pressure source interface, wherein:

the filament is arranged above the crucible and is fixedly connected with the integrated cover;

the opening of the crucible is towards the top end of the independent evaporation channel where the crucible is located, and the crucible support is fixed below the crucible and extends out of the integrated cover;

the mounting flange clamps the plurality of crucible supports;

the moving device is fixed below the mounting flange and penetrates through the mounting flange to be connected with the crucible support, and the moving device adjusts the length of the crucible support so as to adjust the distance between the crucible and the filament;

the high-voltage source interface is positioned below the moving device and connected with the crucible support through the moving device, and the high-voltage source interface provides positive voltage for the crucible through the crucible support.

5. The multi-pass evaporation source of claim 4, wherein the integrated cap has a water cooling function, wherein:

the integrated cover comprises an inner wall and an outer wall, the inner wall wraps the outer surface of the heat insulation layer, the outer wall and the inner wall are of concentric cylinder structures, and cooling liquid is contained between the inner wall and the outer wall.

6. The multi-pass evaporation source of claim 5, wherein the integrated cap further comprises a base carrying the integrated cap.

7. The multi-pass evaporation source of claim 4, wherein the baffle drive comprises a magnetic coupling drive, a first drive rod, and a second drive rod, wherein:

the second transmission rod is of a hollow structure, and the first transmission rod is wrapped in the second transmission rod; the first transmission rod and the second transmission rod penetrate through the mounting flange and extend to the lower part of the moving device;

one end of the first transmission rod is connected with the first baffle plate, and the other end of the first transmission rod is connected with the magnetic coupling driver and is used for transmitting torque between the magnetic coupling driver and the first baffle plate;

one end of the second transmission rod is connected with the second baffle, and the other end of the second transmission rod is connected with the magnetic coupling driver and used for transmitting torque between the magnetic coupling driver and the second baffle.

8. The multi-pass evaporation source of claim 1, wherein the number of the independent evaporation channels is 3, three of the independent evaporation channels are uniformly distributed at 120 degrees, and one of the first baffle plate and the second baffle plate has 4 openings and the other has 5 openings.

Technical Field

The invention relates to the technical field of semiconductors, in particular to a multi-channel evaporation source.

Background

In the production of semiconductor integrated circuits, sensors and solar panels, many structures require vacuum coating techniques to be created. Therefore, the quality of products such as semiconductors and solar panels is directly determined by vacuum coating. The research and application of vacuum coating can not be separated from the generation equipment, so the research and development of the evaporation source have important significance.

At present, the main vacuum coating technologies at home and abroad comprise vacuum evaporation coating, vacuum sputtering coating and vacuum ion coating, wherein the most applied technology is vacuum evaporation coating. Vacuum evaporation coating technology, namely, a film material (such as metal or compound) is evaporated by heating an evaporation source in a high vacuum chamber or an ultrahigh vacuum chamber. The evaporated particles escape from the surface of the film material, and when the mean free path of the evaporated molecules is larger than the linear size between the evaporation source and the substrate, the particles can directly reach the surface of the substrate and condense to form a film.

The electron beam heating evaporation source has the principle that kinetic energy obtained by electrons under the action of an electric field is converted into heating heat energy, so that a film material is heated, evaporated and condensed into a required film. It is mainly composed of cathode, anode, beam-bunching pole and magnetic field. The electron beam heating source has the characteristics of energy concentration, capability of quickly obtaining extremely high temperature on the surface of a film material, higher film material evaporation rate and film deposition rate, capability of being cooled by water and large adjustable temperature range. Most of the existing electron beam heating evaporation sources utilize high-temperature electrons to bombard a film material, melt metal (or compound) by huge energy, evaporate the metal (or compound) and coat the film. The method comprises the following specific steps: the filament is energized and generates heat and hot electrons. The filament is grounded and at ground potential. The evaporation rod/crucible is about 5-10mm from the filament and is connected to a positive high pressure (e.g. + 800V). Under the action of the electric field, electrons are accelerated to bombard the top end of the evaporation rod/crucible, and the evaporation rod/crucible is heated by the high-energy electron beam. The evaporation rod/target material in the crucible is heated, evaporated and deposited on the substrate. The beam monitoring device monitors the growing beam in real time. The evaporation rod assembly needs to be provided with a linear moving assembly for adjusting the distance between the top end of the evaporation rod and the filament.

The main factors affecting the performance of the evaporation coating are the evaporation rate, the residual gas and the evaporation temperature. The evaporation rate directly determines the quality of the film, the corresponding film material corresponds to the corresponding evaporation rate and deposition rate, and the evaporation coating has higher deposition rate compared with other coating methods, and can evaporate most metal and compound films. When a coating process requires a plurality of metals or compounds to jointly form a film material/target material, it is difficult to simultaneously and respectively control different materials so as to meet the process requirements.

Disclosure of Invention

The invention aims to provide a multi-channel evaporation source to solve the problem that the process is difficult to control due to complex film material composition in the existing film coating process.

In order to solve the above technical problem, the present invention provides a multi-pass evaporation source, comprising:

a plurality of groups of independent evaporation channels configured to provide evaporation operation to the film-coated object, respectively;

an integrated cover configured to integrate the top ends of the plurality of groups of independent evaporation channels, which deliver the evaporated target to the coating object through the top ends thereof, in a closed space;

the combined baffle is configured to be positioned between the integrated cover and the film coating object, and the plurality of groups of independent evaporation channels are communicated or separated from the film coating object through opening and closing actions;

a shutter drive configured to control and drive opening and closing motions of the combined shutter;

a mounting flange configured to integrate the plurality of sets of independent evaporation channels with the baffle drive.

Optionally, in the multi-pass evaporation source, the states between the multiple groups of independent evaporation channels and the coating object include:

the multiple groups of independent evaporation channels are communicated with the film coating object;

the multiple groups of independent evaporation channels are isolated from the film coating object;

one or more of the independent evaporation channels are communicated with the film coating object;

one or more of the independent evaporation channels are isolated from the coating object.

Optionally, in the multi-pass evaporation source, the combined baffle includes a first baffle and a second baffle, wherein:

the first baffle and the second baffle are overlapped, the bottom surface of the second baffle is over against the top ends of the multiple groups of independent evaporation channels, and the top surface of the first baffle is over against the coating object;

the first baffle and the second baffle are provided with a plurality of openings;

the number of the openings is set according to the number of the independent evaporation channels;

when the open pore of the first baffle plate and the open pore of the second baffle plate are superposed above the top end of one independent evaporation channel, the independent evaporation channel is communicated with the film coating object, otherwise, the independent evaporation channel is separated from the film coating object.

Optionally, in the multi-pass evaporation source, each group of independent evaporation channels includes a filament, a crucible support, a moving device, and a high-pressure source interface, wherein:

the filament is arranged above the crucible and is fixedly connected with the integrated cover;

the opening of the crucible is towards the top end of the independent evaporation channel where the crucible is located, and the crucible support is fixed below the crucible and extends out of the integrated cover;

the mounting flange clamps the plurality of crucible supports;

the moving device is fixed below the mounting flange and penetrates through the mounting flange to be connected with the crucible support, and the moving device adjusts the length of the crucible support so as to adjust the distance between the crucible and the filament;

the high-voltage source interface is positioned below the moving device and connected with the crucible support through the moving device, and the high-voltage source interface provides positive voltage for the crucible through the crucible support.

Optionally, in the multi-pass evaporation source, the integrated cover has a water cooling function, wherein:

the integrated cover comprises an inner wall and an outer wall, the inner wall wraps the outer surface of the heat insulation layer, the outer wall and the inner wall are of concentric cylinder structures, and cooling liquid is contained between the inner wall and the outer wall.

Optionally, in the multi-pass evaporation source, the integrated cover further includes a base, and the base carries the integrated cover.

Optionally, in the multi-pass evaporation source, the baffle driver includes a magnetic coupling driver, a first driving rod and a second driving rod, wherein:

the second transmission rod is of a hollow structure, and the first transmission rod is wrapped in the second transmission rod; the first transmission rod and the second transmission rod penetrate through the mounting flange and extend to the lower part of the moving device;

one end of the first transmission rod is connected with the first baffle plate, and the other end of the first transmission rod is connected with the magnetic coupling driver and is used for transmitting torque between the magnetic coupling driver and the first baffle plate;

one end of the second transmission rod is connected with the second baffle, and the other end of the second transmission rod is connected with the magnetic coupling driver and used for transmitting torque between the magnetic coupling driver and the second baffle.

Optionally, in the multi-pass evaporation source, the number of the independent evaporation channels is 3, three independent evaporation channels are uniformly distributed at 120 degrees, one of the first baffle plate and the second baffle plate has 4 openings, and the other one has 5 openings.

In the multi-channel evaporation source provided by the invention, evaporation operation is respectively provided for a film-coated object through a plurality of groups of independent evaporation channels, an integrated cover integrates the top ends of the plurality of groups of independent evaporation channels into a closed space, the plurality of groups of independent evaporation channels transmit evaporated target materials to the film-coated object through the top ends of the independent evaporation channels, a combined baffle plate is positioned between the integrated cover and the film-coated object, the plurality of groups of independent evaporation channels and the film-coated object are communicated or separated through opening and closing actions, the plurality of groups of independent evaporation channels and the baffle plate are integrated through a mounting flange in a driving way, and the baffle plate drives and drives the opening action and the closing action of the combined baffle plate, so that a plurality of different evaporation sources respectively provide different process conditions for the film-coated object according to film materials/target materials, and simultaneously, time-divisionally, different materials, the independent evaporation channels are adjusted according to different process steps and different process conditions (voltage, time or evaporation rate and the like), so that the whole process flow is simple, easy to operate, flexible and changeable, and the quality of a coating object product is guaranteed.

Drawings

FIGS. 1 to 9 are schematic structural views of a multi-pass evaporation source according to an embodiment of the present invention;

shown in the figure: 1-independent evaporation channel; 2-an integrated cover; 3-a combined baffle; 4-installing a flange; 5, driving a baffle; 6-a first baffle; 7-a second baffle; 8-opening the hole; 9-the top end of the independent evaporation channel; 10-molybdenum rod; 11-a crucible; 12-crucible support; 13-a mobile device; 14-high voltage source interface; 15-a magnetically coupled driver; 16-a first transfer lever; 17-a second transmission rod; 18-baffle base bolt holes; 191-a copper module; 192 a ceramic module; 20-inner wall; 21-outer wall; 22-tubular shielding case; 23-coolant delivery lines; 24-a base; 25-an integrated hood baffle; 26-a diaphragm base; 27-a robust ceramic; 28-securing the ceramic fixture.

Detailed Description

The multi-pass evaporation source according to the present invention will be described in detail with reference to the accompanying drawings and specific embodiments. Advantages and features of the present invention will become apparent from the following description and from the claims. It is to be noted that the drawings are in a very simplified form and are not to precise scale, which is merely for the purpose of facilitating and distinctly claiming the embodiments of the present invention.

The core idea of the invention is to provide a multi-channel evaporation source to solve the problem that the process is difficult to control due to the complex composition of film materials in the existing film coating process.

In order to achieve the above idea, the present invention provides a multi-pass evaporation source, comprising: a plurality of groups of independent evaporation channels configured to provide evaporation operation to the film-coated object, respectively; an integrated cover configured to integrate the top ends of the plurality of groups of independent evaporation channels, which deliver the evaporated target to the coating object through the top ends thereof, in a closed space; the combined baffle is configured to be positioned between the integrated cover and the film coating object, and the plurality of groups of independent evaporation channels are communicated or separated from the film coating object through opening and closing actions; a mounting flange configured to integrate the plurality of sets of independent evaporation channels with a baffle drive; a shutter drive configured to control and drive opening and closing motions of the combined shutter.

< example one >

This embodiment provides a multichannel formula evaporation source, multichannel formula evaporation source includes: a plurality of sets of independent evaporation channels 1 configured to provide evaporation operations to the coating object, respectively; an integrated cover 2 configured to integrate the top ends 9 of the plurality of groups of independent evaporation channels 1 into a closed space, wherein the plurality of groups of independent evaporation channels 1 convey evaporated targets to the coating object through the top ends 9 thereof; the combined baffle 3 is arranged between the integrated cover 2 and the coating object, and the multiple groups of independent evaporation passages 1 are communicated or separated from the coating object through opening and closing actions; a mounting flange 4 configured to integrate the plurality of sets of independent evaporation channels 1 with a baffle drive; the mounting flange also serves as a standard mounting interface for mounting the multi-pass evaporation source to other systems (e.g., a vacuum chamber). A shutter drive 5 configured to control and drive the opening and closing actions of the combined shutter 3.

As shown in fig. 7, in the multi-pass evaporation source, the communication state between the plurality of independent evaporation channels 1 and the coating object includes: the multiple groups of independent evaporation channels 1 are communicated with the film coating object; the plurality of groups of independent evaporation channels 1 are isolated from the coating object; one or more of the independent evaporation channels 1 are communicated with the film coating object; one or more of the independent evaporation channels 1 are isolated from the coating object.

As shown in fig. 2, in the multi-pass evaporation source, the combined baffle 3 includes a first baffle 6 and a second baffle 7, wherein: the first baffle 6 and the second baffle 7 are overlapped, the bottom surface of the second baffle 7 is over against the top ends 9 of the multiple groups of independent evaporation channels 1, and the top surface of the first baffle 6 is over against the coating object; as shown in fig. 5 to 6, the first baffle 6 and the second baffle 7 are provided with a plurality of openings 8; the number of the openings 8 is set according to the number of the independent evaporation channels 1; as shown in fig. 2 and 7, when the openings 8 of the first baffle 6 and the openings 8 of the second baffle 7 coincide above the top end 9 of one of the individual evaporation passages 1, the individual evaporation passage 1 communicates with the coating object, otherwise the individual evaporation passage 1 is blocked from the coating object.

As shown in fig. 2, a molybdenum rod 10 is used to fix a filament (not shown). The copper block 191 and the ceramic block 192 are used to fix the filament and the filament assembly formed of the molybdenum rod 10. The molybdenum rod 10 is fixed on the ceramic module 192 by brazing, and the ceramic module 192 is made of ceramic, so that the filament can be insulated from the ground. The copper module 191 is made of copper and mainly functions to be fixed with the integrated cover 2 to form a cooling closed space, the crucible/target material is arranged in the cooling closed space, most of heat radiated from the heated crucible/target material is absorbed by the integrated cover 2, the upper copper module 192 and the lower base 24, and the heat is prevented from being radiated to heat other parts in the vacuum chamber, so that the temperature of the parts is increased, gas is released, and the vacuum is influenced. The tubular shield 22 is a shield/shield for wrapping the filament connection joint, as can be seen in fig. 2, the molybdenum rod 10 is bent into an L-shape, the short rod part at the top perpendicular to the axial direction is used for connecting with the cable for power supply, and the tubular shield 22 is used for wrapping the connection assembly to play a certain protection role (preventing the material from growing on the connection assembly to cause short circuit when other evaporation sources in the system are evaporated and coated).

As shown in fig. 1, 2 and 3, in the multi-pass evaporation source, each set of independent evaporation channels 1 includes a filament (not shown), a molybdenum rod 10, a crucible 11, a crucible support 12, a moving device 13 and a high-voltage source interface 14, wherein: the molybdenum rod 10 (connected with a filament to form a filament assembly) is arranged above the crucibles 11 and is fixedly connected with the tube-mounted shielding cover 22 in the integrated cover 2, the tube-mounted shielding cover 22 is fixedly connected with the combined baffle base through the baffle base bolt hole 18, the plurality of crucibles 11 are integrated in a module formed by the integrated cover 2, and the tube-mounted shielding cover 22 is fixedly connected with the integrated cover 2; the opening of the crucible 11 faces the top end 9 of the independent evaporation channel 1 where the crucible 11 is located, the crucible supports 12 are fixed below the crucible 11 and extend out of the integrated cover 2, or the integrated cover 2 further comprises a base 24, the base 24 is used for fixing a plurality of crucible supports 12, the base 24 clamps the stable ceramics 27, and the stable ceramics 27 clamps the crucible supports 12 (made of molybdenum rods); the base 24 extending from the crucible support 12 is integrated by the mounting flange 4; the moving device 13 is fixed below the mounting flange 4 and penetrates through the mounting flange 4 to be connected with the crucible support 12, and the moving device 13 adjusts the length of the crucible support 12 so as to adjust the distance between the crucible 11 and the molybdenum rod 10; the high-voltage source interface 14 is positioned below the moving device 13 and is connected with the crucible support 12 through the moving device 13, and the high-voltage source interface 14 provides positive voltage to the crucible 11 through the crucible support 12.

As shown in fig. 2, in the multi-pass evaporation source, the integrated cap 2 has a water cooling function, in which: the integrated cover 2 comprises an inner wall 20 and an outer wall 21, the outer wall 21 and the inner wall 20 are of a concentric cylindrical structure, cooling liquid is accommodated between the inner wall 20 and the outer wall 21, as shown in fig. 1, two cooling liquid conveying pipelines 23 inject the cooling liquid into a space between the inner wall 20 and the outer wall 21 or guide the cooling liquid out, and the two cooling liquid conveying pipelines 23 input one way and output the other way. In the multi-pass evaporation source, the base 24 is also used to carry the integrated cap.

As shown in fig. 1, 2 and 4, in the multi-pass evaporation source, the baffle plate driver 5 includes a magnetic coupling driver 15, a first driving rod 16 and a second driving rod 17, wherein: the second transmission rod 17 is a hollow structure, and the first transmission rod 16 is wrapped in the second transmission rod 17; the first transmission rod 16 and the second transmission rod 17 penetrate through the mounting flange 4 and extend to the lower part of the moving device 13; one end of the first transmission rod 16 is connected with the first baffle 6, and the other end is connected with the magnetic coupling driver 15, so that torque can be transmitted between the magnetic coupling driver 15 and the first baffle 6; one end of the second transmission rod 17 is connected to the second baffle 7, and the other end is connected to the magnetic coupling driver 15, and is configured to transmit torque between the magnetic coupling driver 15 and the second baffle 7.

As shown in fig. 3 and 4, in the multi-pass evaporation source, the number of the independent evaporation channels 1 is 3, three independent evaporation channels 1 are uniformly distributed at 120 degrees, and correspondingly, one of the first baffle plate 6 and the second baffle plate 7 has 4 openings 8, and the other one has 5 openings 8.

As shown in FIG. 8, an integrated hood spacer ring 25 was placed in the cylindrical space in the middle of the integrated hood, and this cylindrical space was divided into 3 equal parts, each of which was filled with one evaporation source module. Therefore, the heat radiated from the heated crucible/evaporator rod can be taken away by the integrated cover, and other parts in the heating system are prevented from influencing the vacuum of the system. As shown in fig. 3, the partition base 26 is carried on the base 24, and three grooves with an angle of 120 ° are formed on the partition base 6 for clamping the partition 25 therein.

As shown in fig. 9, in the path between the crucible/evaporation rod 104 and the substrate 101, there is a beam detecting device 102 configured as a ring. The filament 103 is energized and emits thermal electrons. The filament 103 is grounded, the crucible/evaporation rod 104 is connected with high voltage, and the target material is heated under the action of the electric field and grows in the form of atoms/molecules. The grown target atomic beam (red small dots in the upper drawing) diffuses towards the substrate. When target material atoms diffuse to the substrate, the diffusion direction is opposite to the movement direction of electrons, and partial atoms are bombarded and ionized by the electrons to become ions. The beam current detection device 102 is grounded, and an ammeter is connected in series in the middle. Under the influence of the electric field, the partially ionized ions will bombard the beam detector 102, and thus the current meter will have a current reading. Under the same condition (the same beam detection mechanism structure, material and high voltage), the current is in direct proportion to the size of the growing target atomic beam. Thus, the magnitude of the growing beam can be monitored in real time by monitoring the magnitude of the current of the beam detecting device 102.

In principle, the diffusion angle of the target material grown from the same point is large, in order to limit the growth angle and prevent the material from growing on other parts in the system, a limiting/guiding hole is generally added at the top of the crucible, i.e. an independent evaporation channel 1 is formed, and the purpose of the independent evaporation channel 1 is to only keep the beam current growing towards the substrate.

The crucible support 12, made of molybdenum rod, is held by a stabilizing ceramic 27, which has the following functions: 1, the crucible support 12 is prevented from shaking, and the stabilizing effect is achieved; 2, insulating; 3, when the crucible is required to move up and down, the stable ceramic 27 has a certain lubricating effect. The fixing ceramic holder 28 is to fix the fixing ceramic 27 to the crucible support 12, and to prevent the fixing ceramic 27 from sliding up and down.

In the multi-channel evaporation source provided by the invention, evaporation operation is respectively provided for a film-coated object through a plurality of groups of independent evaporation channels 1, an integrated cover 2 integrates the top ends 9 of the plurality of groups of independent evaporation channels 1 into a closed space, the plurality of groups of independent evaporation channels 1 transmit evaporated target materials to the film-coated object through the top ends 9 of the independent evaporation channels, a combined baffle plate 3 is positioned between the integrated cover 2 and the film-coated object, the plurality of groups of independent evaporation channels 1 are communicated or separated with the film-coated object through opening and closing actions, the plurality of groups of independent evaporation channels 1 are integrated with a baffle plate drive through a mounting flange 4, the baffle plate drive 5 controls and drives the opening and closing actions of the combined baffle plate 3, so that a plurality of different evaporation sources respectively provide different process conditions for the film-coated object according to film materials/target materials, meanwhile, the independent evaporation channels 1 can be adjusted according to different materials, different process steps and different process conditions (voltage, time or evaporation rate and the like) in a time-sharing manner, so that the whole process flow is simple and easy to operate, is flexible and changeable, and ensures the quality of the product of the film-coated object.

In summary, the above embodiments have described the different configurations of the multi-pass evaporation source in detail, but it is understood that the present invention is not limited to the configurations described in the above embodiments, and any modifications based on the configurations provided in the above embodiments are within the scope of the present invention. One skilled in the art can take the contents of the above embodiments to take a counter-measure.

The above description is only for the purpose of describing the preferred embodiments of the present invention, and is not intended to limit the scope of the present invention, and any variations and modifications made by those skilled in the art based on the above disclosure are within the scope of the appended claims.