CN113235063A

CN113235063A - Observation window structure of vacuum evaporation machine

Info

Publication number: CN113235063A
Application number: CN202110738870.9A
Authority: CN
Inventors: 薛蒙晓
Original assignee: Suzhou Youlun Vacuum Equipment Technology Co ltd
Current assignee: Suzhou Youlun Vacuum Equipment Technology Co ltd
Priority date: 2021-06-30
Filing date: 2021-06-30
Publication date: 2021-08-10

Abstract

The application provides a vacuum evaporation machine's observation window structure, the observation window structure sets up on vacuum evaporation machine's cavity door, the observation window structure includes from the extroversion to the inside: the outer layer glass and the mounting frame are fixed on the cavity door, the extending piece is connected with the mounting frame and is positioned in a main cavity of the vacuum evaporation machine, an inclination angle a is formed between the extending piece and a vertical line of the inner wall of the cavity door, the inclination angle a is 0-180 degrees, and the mounting frame is provided with a first through hole; the two extending pieces are arranged on the mounting frame up and down, the inclination angles a of the two extending pieces are the same or different, and one or two of the extending pieces have a reflection function; light in the main cavity chamber of vacuum evaporation plating machine passes first through-hole arrival outer glass after extending the reflection of piece, and the coating by vaporization material who sets up in the crucible on main cavity body bottom plate is the upwards evaporation of cone form with scattering angle b when the coating film, and the extension piece blocks the coating by vaporization material of evaporation and prevents that coating by vaporization material from passing first through-hole.

Description

Observation window structure of vacuum evaporation machine

Technical Field

The invention relates to the technical field of vacuum evaporation machines, in particular to an observation window structure of a vacuum evaporation machine.

Background

The vacuum evaporation plating machine is used for evaporating and gasifying a coating material (or called a coating material) by means of current heating, electron beam bombardment heating, ion source bombardment and the like under a vacuum condition, and then enabling gasified particles to fly to the surface of a substrate to be condensed, and finally forming a thin film. The vacuum evaporation has the advantages of simple film forming method, high film purity and compactness, unique film structure and performance and the like, thereby being widely applied. In the processing technique of vacuum evaporation, a crucible is adopted to gasify a coating material under the vacuum condition, and the crucible comprises: the evaporation coating device comprises an evaporation coating cavity and an evaporation coating source arranged in the evaporation coating cavity, wherein the evaporation coating source is heated to evaporate evaporation coating materials evaporated in the evaporation coating source, the evaporation coating materials are upwards evaporated in a fan-shaped structure, a coating pot with an umbrella-shaped structure for bearing a coated workpiece is arranged above a crucible, and the coated workpiece is fixed on the coating pot, so that evaporation coating material molecules are deposited on the coated workpiece to form a coated film.

In the process of coating, the operation condition in the main cavity of the vacuum evaporation machine, the condition of evaporation materials in the crucible, the rotation condition of the plating pot, the state of the heating lamp and the like can be visually observed through the observation window structure. The observation window structure of the existing vacuum evaporator comprises a handle, a rotating shaft, outer layer glass and rotating glass from outside to inside, wherein the rotating glass rotates synchronously along with the rotating shaft, and then the condition in a cavity of the vacuum evaporator is observed through an observation hole on a defending plate. And because the place that gyration glass is facing to the observation hole can be by the coating film, will turn around glass and not observe by the place of coating film facing to the observation hole in next observation, it can not observe by whole coating films again to use gyration glass after several times, just need often to change the gyration glass in the cavity door, gyration glass is called the consumable article, material cost and the processing cost of change are all great, and prevent that the observation hole on the board is very little, it is narrow to observe the inside vision angle of main cavity body, and it is not very convenient that the human body will lie prone and observe on the cavity door.

In view of the above, the present invention provides an observation window structure of a vacuum evaporation machine, which completely subverts the observation window structure of the prior art, and has a simpler structure, and more importantly, the observation glass of the observation window structure is not coated with an evaporation material, has no parts needing to be replaced due to coating, and has a large visual angle, and is comfortable for human observation.

Disclosure of Invention

The invention aims to provide an observation window structure of a vacuum evaporator, which completely subverts the observation window structure in the prior art and has simpler structure, more importantly, the observation glass of the observation window structure cannot be coated by evaporation materials, has no parts needing to be replaced due to coating, has large visual angle and is comfortable for human body observation.

The observation window structure of the vacuum evaporation machine has the advantages that the extending pieces positioned in the main cavity have the double functions of reflecting light rays so as to facilitate the observation of the condition in the main cavity by human eyes and preventing evaporated evaporation materials from passing through the first through hole of the mounting frame, the evaporation materials are completely blocked by the two extending pieces, the evaporated evaporation materials are blocked by the lower surfaces of the upper extending piece and the lower surface of the lower extending piece, no evaporation materials pass through the first through hole of the mounting frame and the through hole of the cavity door, so that the outer glass cannot be coated, the outer glass does not need to be replaced, it can take several years without problems, while at the same time the lower surface of the upper extension and/or the upper surface of the lower extension act as a reflector, wherein, the lower surface of the upper extending piece is plated with the film more brightly without influencing the reflection effect, therefore, the observation glass of the observation window structure of the vacuum evaporator cannot be coated by the evaporation material and has no part needing to be replaced due to coating; and, through the inside outer glass direct observation main cavity body of large tracts of land, compare through preventing observing the hole observation on the board with prior art, the increase of visual angle is a lot of, simultaneously, light directly gets into people's eye or/and light and gets into people's eye through extending a reflection back, and is comfortable during human observation, need not lie prone and observe on the cavity door, and it also can to have certain interval observation with the cavity door. The present applicant has completed the present application on this basis.

The utility model provides a vacuum evaporation machine's observation window structure, the observation window structure sets up on vacuum evaporation machine's cavity door, the observation window structure includes from the outside inwards: the outer glass 1 is fixed on a cavity door, the mounting frame 2 is fixed on the cavity door, the extension piece 3 is connected with the mounting frame 2, the extension piece 3 is positioned in a main cavity of a vacuum evaporation machine, an inclination angle a is formed between the extension piece 3 and a vertical line of the inner wall of the cavity door, the inclination angle a is 0-180 degrees, and the mounting frame 2 is provided with a first through hole 21; the number of the extending pieces 3 is two, the two extending pieces 3 are arranged on the mounting frame 2 up and down, the inclination angles a of the two extending pieces 3 are the same or different, and one or two of the extending pieces 3 have a reflecting function; light in vacuum vapor deposition machine's the main cavity room passes first through-hole 21 and reachs outer glass 1 through extending 3 reflection back, consequently people's eye can observe the inside condition of main cavity body in the outside of outer glass 1, and the coating by vaporization material who sets up in the crucible on main cavity body bottom plate is the upwards evaporation of cone form with scattering angle b when the coating film, and extension 3 blocks the coating by vaporization material of evaporation and prevents that coating by vaporization material from passing first through-hole 21.

In some embodiments, when the distance between the surface of the evaporation material in the crucible and the bottom plate of the main cavity is H, the distance between the center point of the surface of the evaporation material in the crucible and the cavity door is L, and when the distance between the lowest point of the upper extension piece 31 of the observation window structure and the bottom plate of the main cavity is greater than H + L × cotb, the extension piece 3 plays a dual role of reflecting light rays to facilitate human eyes to observe the conditions in the main cavity and block the evaporated evaporation material from passing through the first through hole 21; when the distance between the lowest point of the upper extension piece 31 of the observation window structure and the bottom plate of the main cavity is less than or equal to H + L multiplied by cotb, the extension piece 3 plays a role in reflecting light rays to facilitate human eyes to observe the conditions in the main cavity, and the requirement is met at the same time, by connecting a line between the leftmost point of the surface of the evaporation material in the crucible and the rightmost point of the upper edge of the crucible, an included angle between the connecting line and a vertical line of the inner wall of the cavity door is c, the distance between the leftmost point of the surface of the evaporation material in the crucible and the cavity door is L1, and the distance between the highest point of the upper extension piece 31 of the observation window structure and the bottom plate of the main cavity is greater than H + L1 multiplied by cotc.

When the distance between the lowest point of the upper extension piece 31 of the observation window structure and the bottom plate of the main cavity is less than or equal to H + L multiplied by cotb, the evaporation material which is not required to be blocked by the extension piece 3 and is not evaporated passes through the first through hole 21, a small amount of evaporation material except the scattering angle b can be ignored, and the outer glass 1 is not required to be replaced for several years, but the surface of the evaporation material in the crucible is lower than the upper surface of the crucible, the crucible is bowl-shaped, the side wall of the crucible can cause visual influence when observing the evaporation material in the crucible, when the distance between the highest point of the upper extension piece 31 of the observation window structure and the bottom plate of the main cavity is less than or equal to H + L1 multiplied by cotc, human eyes can not observe any evaporation material in the crucible through the observation window structure, the sight is completely blocked by the right side wall of the crucible, therefore, in order to observe the condition of the evaporation material in the crucible, the height of the observation window structure on the cavity door is required to be the lowest, and the distance between the highest point of the upper extension piece 31 of the observation window structure and the bottom plate of the main cavity is larger than H + L1 multiplied by cotc.

Further, when the distance between the lowest point of the upper extending member 31 of the observation window structure and the bottom plate of the main cavity is greater than H + L × cotb, the lower surface of the lower extending member 32 and the lower surface of the upper extending member 31 block the evaporated evaporation material, and it is satisfied that, by using a connection line between the center point of the evaporation material surface in the crucible and the highest point of the lower extending member 32, an included angle between the connection line and a vertical line of the inner wall of the cavity door is d, the length of the lower extending member 32 is M, and the distance between the upper extending member 31 and the lower extending member 32 on the mounting bracket 2 is equal to or less than M × cosa + M × sina × cotd.

If the distance between the upper extending member 31 and the lower extending member 32 on the mounting frame 2 is greater than M × cosa + M × sina × cotd, the evaporated evaporation material may pass through the first through hole 21 and the cavity door through hole to be coated on the inner surface of the outer glass 1, and after the inner surface of the outer glass 1 is coated, the human eye cannot observe the main cavity through the outer glass 1, and the outer glass 1 needs to be replaced periodically, so when the distance between the lowest point of the upper extending member 31 of the observation window structure and the bottom plate of the main cavity is greater than H + L × cotb, it is necessary to satisfy that the distance between the upper extending member 31 and the lower extending member 32 on the mounting frame 2 is less than or equal to M × cosa + M × sina × cotd.

Further, when observing the evaporation material in the crucible by human eyes, light is reflected to the upper surface of the lower extension piece 32 through the lower surface of the upper extension piece 31, the upper surface of the lower extension piece 32 is reflected and then passes through the first through hole 21 to reach the outer layer glass 1, the lower surface of the upper extension piece 31 and the upper surface of the lower extension piece 32 both have a reflection function, or the light is reflected through the lower surface of the upper extension piece 31 and then directly passes through the first through hole 21 to reach the outer layer glass 1, and the lower surface of the upper extension piece 31 has a reflection function; when people observe the plating pot above the main cavity, light directly passes through the first through hole 21 to reach the outer glass 1 after being reflected by the upper surface of the lower extension piece 32, the upper surface of the lower extension piece 32 has a reflection function, or/and the light directly passes through the first through hole 21 to reach the outer glass 1.

In some embodiments, the observation window structure has one or more observation window structures, one observation window structure is arranged in the middle of the cavity door, the plurality of observation window structures are regularly distributed on the cavity door, and the position of the observation window structure, the length of the extension piece 3, the inclination angle a of the extension piece 3, the reflection function of the extension piece 3, and the distance between the upper extension piece 31 and the lower extension piece 32 on the mounting frame 2 are adjusted according to actual needs.

In some embodiments, the cavity door is provided with a through hole, the outer glass 1 is fixed at a position corresponding to the through hole of the cavity door, and the outer glass 1 is fixed on the outer wall of the cavity door outside the through hole of the cavity door, or fixed on the inner wall of the cavity door inside the through hole of the cavity door, or fixed inside the through hole of the cavity door.

Further preferably, the outer layer glass 1 is fixed on the outer wall of the cavity door outside the through hole of the cavity door or fixed inside the through hole of the cavity door.

Further, the first through holes 21 of the cavity door through hole, the outer layer glass 1 and the mounting rack 2 are one of square, rectangle, circle or ellipse, and the shapes of the cavity door through hole, the outer layer glass 1 and the mounting rack 2 are the same or different.

Further, the observation window structure further comprises a hollow fixing piece 4, the hollow fixing piece 4 is used for fixing the outer layer glass 1 with the cavity door, the hollow fixing piece 4 is fixed with the cavity door through a screw, and the shape of the hollow part of the hollow fixing piece 4 is the same as that of the outer layer glass 1.

In some embodiments, the mounting bracket 2 further includes a cavity door fixing portion 22 and an extension fixing portion 23, the first through hole 21 is disposed on the cavity door fixing portion 22, the cavity door fixing portion 22 is fixed to the cavity door, the extension fixing portion 23 is located in the main cavity, and the extension fixing portion 23 is connected to the extension 3.

Further, the extension fixing part 23 and the extension 3 are fixed by screws or bolts, and the inclination angle a of the extension 3 can be adjusted by external force by adjusting the tightness of the screws or bolts.

Drawings

Fig. 1 is a front view of an observation window structure and a main cavity door of a vacuum evaporator according to the present invention.

Fig. 2 is a schematic structural view of an observation window structure and a main cavity door of the vacuum evaporator of the present application.

Fig. 3 is a schematic structural view of a cross-sectional view of an observation window structure and a main cavity door of the vacuum evaporator of the present application.

Fig. 4 is a schematic view of an observation window structure of a vacuum evaporator according to the present invention for blocking an evaporation material.

Fig. 5 is a schematic view of the structure of the observation window of the vacuum evaporator according to the present invention for reflecting light.

Description of the main element symbols:

outer glass 1, mounting bracket 2, extension piece 3, hollow fixing piece 4, first through hole 21, cavity door fixed part 22, extension piece fixed part 23, top extension piece 31, below extension piece 32.

Detailed Description

The following examples are described to aid in the understanding of the present application and are not, and should not be construed to, limit the scope of the present application in any way.

In the following description, those skilled in the art will recognize that components may be described throughout this discussion as separate functional units (which may include sub-units), but those skilled in the art will recognize that various components or portions thereof may be divided into separate components or may be integrated together (including being integrated within a single system or component).

Also, connections between components or systems within the figures are not intended to be limited to direct connections. Rather, data between these components may be modified, reformatted, or otherwise changed by the intermediate components. Additionally, additional or fewer connections may be used. It should also be noted that the terms "coupled," "connected," or "input" and "fixed" are understood to encompass direct connections, indirect connections, or fixed through one or more intermediaries.

In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "side", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on orientations or positional relationships shown in the drawings or orientations or positional relationships commonly recognized in the product of the application, and are only used for convenience in describing the present application and simplifying the description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present application. Furthermore, the terms "first," "second," "third," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.

Example 1:

an observation window structure of a vacuum evaporator, as shown in fig. 1-5, the observation window structure is arranged on a cavity door of the vacuum evaporator, and the observation window structure comprises from outside to inside: the outer glass 1 is fixed on a cavity door, the mounting frame 2 is fixed on the cavity door, the extension piece 3 is connected with the mounting frame 2, the extension piece 3 is positioned in a main cavity of a vacuum evaporation machine, an inclination angle a is formed between the extension piece 3 and a vertical line of the inner wall of the cavity door, the inclination angle a is 0-180 degrees, and the mounting frame 2 is provided with a first through hole 21; the number of the extending pieces 3 is two, the two extending pieces 3 are arranged on the mounting frame 2 up and down, the inclination angles a of the two extending pieces 3 are the same or different, and one or two of the extending pieces 3 have a reflecting function; light in vacuum vapor deposition machine's the main cavity room passes first through-hole 21 and reachs outer glass 1 through extending 3 reflection back, consequently people's eye can observe the inside condition of main cavity body in the outside of outer glass 1, and the coating by vaporization material who sets up in the crucible on main cavity body bottom plate is the upwards evaporation of cone form with scattering angle b when the coating film, and extension 3 blocks the coating by vaporization material of evaporation and prevents that coating by vaporization material from passing first through-hole 21.

As shown in the upper observation window of fig. 4, the position of the upper observation window structure is a critical point where the evaporation material in the crucible is evaporated upwards in a cone shape at a scattering angle b during film coating, the distance between the lowest point of the upper extension piece 31 of the upper observation window structure and the bottom plate of the main cavity is equal to H + L × cotb, the distance between the surface of the evaporation material in the crucible and the bottom plate of the main cavity during film coating is H, the distance between the center point of the surface of the evaporation material in the crucible and the cavity door is L, and when the distance between the lowest point of the upper extension piece 31 of the upper observation window structure and the bottom plate of the main cavity is greater than H + L × cotb, the extension piece 3 plays a dual role of reflecting light to facilitate human eyes to observe the conditions in the main cavity and block the evaporated evaporation material from passing through the first through hole 21; when the distance between the lowest point of the upper extending piece 31 of the observation window structure and the bottom plate of the main cavity is less than or equal to H + L multiplied by cotb, the extending piece 3 plays a role in reflecting light rays to facilitate human eyes to observe the conditions in the main cavity. When the distance between the lowest point of the upper extension piece 31 of the observation window structure and the bottom plate of the main cavity is less than or equal to H + L multiplied by cotb, the evaporation material which is not required to be blocked by the extension piece 3 and is not evaporated passes through the first through hole 21, a small amount of evaporation material except the scattering angle b can be ignored, and the outer glass 1 is not required to be replaced for several years, but the surface of the evaporation material in the crucible is lower than the upper surface of the crucible, the crucible is bowl-shaped, the side wall of the crucible can cause visual influence when observing the evaporation material in the crucible, when the distance between the highest point of the upper extension piece 31 of the observation window structure and the bottom plate of the main cavity is less than or equal to H + L1 multiplied by cotc, human eyes can not observe any evaporation material in the crucible through the observation window structure, the sight is completely blocked by the right side wall of the crucible, therefore, in order to observe the condition of the evaporation material in the crucible, the height of the observation window structure on the cavity door is required to be the lowest, and the distance between the highest point of the upper extension piece 31 of the observation window structure and the bottom plate of the main cavity is larger than H + L1 multiplied by cotc. Taking a connecting line between the leftmost point of the surface of the evaporation material in the crucible and the rightmost point of the upper edge of the crucible, the included angle between the connecting line and the vertical line of the inner wall of the cavity door is c, and the distance between the leftmost point of the surface of the evaporation material in the crucible and the cavity door is L1, as shown by the lower observation window in FIG. 4, the position of the lower observation window structure is a critical point where the distance between the highest point of the upper extension piece 31 of the observation window structure and the bottom plate of the main cavity body is equal to H + L1 Xcotc, that is, the critical point where the highest point of the upper extension piece 31 and the connecting line just contact, and the distance between the highest point of the upper extension piece 31 of the observation window structure and the bottom plate of the main cavity body is greater than H + L1 Xcotc.

When the distance between the lowest point of the upper extending piece 31 of the observation window structure and the bottom plate of the main cavity is larger than H + L × cotb, the lower surface of the lower extending piece 32 and the lower surface of the upper extending piece 31 block the evaporated evaporation material, and at the same time, it is satisfied that, by a connecting line between the central point of the evaporation material surface in the crucible and the highest point of the lower extending piece 32, an included angle between the connecting line and a vertical line of the inner wall of the cavity door is d, the length of the lower extending piece 32 is M, and the distance between the upper extending piece 31 and the lower extending piece 32 on the mounting frame 2 is smaller than or equal to M × cosa + M × sina × cotd. If the distance between the upper extension 31 and the lower extension 32 on the mounting frame 2 is greater than M × cosa + M × sina × cotd, as shown in the middle observation window structure of fig. 5, the evaporated evaporation material may pass through the first through hole 21 and the cavity door through hole to be coated on the inner surface of the outer glass 1, and after the inner surface of the outer glass 1 is coated, the human eye cannot observe the main cavity through the outer glass 1, and the outer glass 1 needs to be replaced periodically, so when the distance between the lowest point of the upper extension 31 and the bottom plate of the main cavity of the observation window structure is greater than H + L × cotb, it is necessary to satisfy that the distance between the upper extension 31 and the lower extension 32 on the mounting frame 2 is less than or equal to M × cosa + M × sina × cotd.

When the human eye observes the evaporation material in the crucible, as shown in the upper and lower observation window structures shown in fig. 5, light is reflected to the upper surface of the lower extension piece 32 through the lower surface of the upper extension piece 31, the upper surface of the lower extension piece 32 passes through the first through hole 21 to reach the outer layer glass 1 after being reflected, both the lower surface of the upper extension piece 31 and the upper surface of the lower extension piece 32 have a reflection function, or the light directly passes through the first through hole 21 to reach the outer layer glass 1 after being reflected by the lower surface of the upper extension piece 31, and the lower surface of the upper extension piece 31 has a reflection function; when people observe the plating pot above the main cavity, light is reflected by the upper surface of the lower extension piece 32 and then reaches the outer glass 1 through the first through hole 21, the upper surface of the lower extension piece 32 has a reflection function, or/and the light directly reaches the outer glass 1 through the first through hole 21.

The observation window structure is provided with one or more observation window structures, the observation window structure is arranged in the middle of the cavity door with one observation window structure, the observation window structures are regularly distributed on the cavity door with a plurality of observation window structures, and the position of the observation window structure, the length of the extension piece 3, the inclination angle a of the extension piece 3, the reflection function of the extension piece 3, and the distance between the upper extension piece 31 and the lower extension piece 32 on the mounting frame 2 are adjusted according to actual needs. The cavity door is provided with a through hole, and the outer layer glass 1 is fixed on the outer wall of the cavity door outside the through hole of the cavity door or fixed inside the through hole of the cavity door. The through hole of the cavity door and the outer layer glass 1 are circular, and the first through hole of the mounting rack 2 is square. The observation window structure further comprises a hollow fixing piece 4, the hollow fixing piece 4 is used for fixing the outer layer glass 1 with the cavity door, the hollow fixing piece 4 is fixed with the cavity door through screws, and the shape of the hollow part of the hollow fixing piece 4 is the same as that of the outer layer glass 1. The mounting rack 2 further comprises a cavity door fixing portion 22 and an extension piece fixing portion 23, the first through hole 21 is formed in the cavity door fixing portion 22, the cavity door fixing portion 22 is fixed to the cavity door, the extension piece fixing portion 23 is located in the main cavity, and the extension piece fixing portion 23 is connected with the extension piece 3. The extension fixing part 23 is fixed to the extension 3 by a screw or a bolt, and the inclination angle a of the extension 3 can be adjusted by an external force by adjusting the tightness of the screw or the bolt.

While various aspects and embodiments have been disclosed herein, it will be apparent to those skilled in the art that other aspects and embodiments can be made without departing from the spirit of the disclosure, and that several modifications and improvements can be made without departing from the spirit of the disclosure. The various aspects and embodiments disclosed herein are presented by way of example only and are not intended to limit the present disclosure, which is to be controlled in the spirit and scope of the appended claims.

Claims

1. The utility model provides a vacuum evaporation machine's observation window structure, the observation window structure sets up on vacuum evaporation machine's cavity door, its characterized in that, the observation window structure includes from outside to inside: the vacuum evaporation coating machine comprises outer glass (1), an installation frame (2) and an extension piece (3), wherein the outer glass (1) is fixed on a cavity door, the installation frame (2) is fixed on the cavity door, the extension piece (3) is connected with the installation frame (2), the extension piece (3) is positioned in a main cavity of the vacuum evaporation coating machine, an inclination angle a is formed between the extension piece (3) and a vertical line of the inner wall of the cavity door, the inclination angle a is 0-180 degrees, and the installation frame (2) is provided with a first through hole (21); the two extending pieces (3) are arranged on the mounting frame (2) up and down, the inclination angles a of the two extending pieces (3) are the same or different, and one or two of the extending pieces (3) have a reflection function; light in vacuum evaporation machine's the main cavity room passes first through-hole (21) through extending piece (3) reflection back and reachs outer glass (1), consequently people's eye can observe the inside condition of main cavity body in the outside of outer glass (1), and the coating by vaporization material in the crucible of setting on main cavity body bottom plate is the upwards evaporation of cone form with scattering angle b when the coating film, and extension piece (3) block the coating by vaporization material of evaporation and prevent that coating by vaporization material from passing first through-hole (21).

2. The observation window structure of vacuum evaporation machine according to claim 1, wherein the distance between the surface of evaporation material in the crucible and the bottom plate of the main cavity body during coating is H, the distance between the center point of the surface of evaporation material in the crucible and the cavity door is L, and when the distance between the lowest point of the upper extension piece (31) of the observation window structure and the bottom plate of the main cavity body is greater than H + L × cotb, the extension piece (3) plays a dual role of reflecting light rays to facilitate human eyes to observe the conditions in the main cavity body and to block the evaporated evaporation material from passing through the first through hole (21); when the distance between the lowest point of the upper extension piece (31) of the observation window structure and the bottom plate of the main cavity body is less than or equal to H + L multiplied by cotb, the extension piece (3) plays a role in reflecting light rays to facilitate human eyes to observe the situation in the main cavity body, and at the same time, the distance between the leftmost point of the surface of the evaporation material in the crucible and the rightmost point of the upper edge of the crucible is satisfied, the included angle between the connecting line and the vertical line of the inner wall of the cavity door is c, the distance between the leftmost point of the surface of the evaporation material in the crucible and the cavity door is L1, and the distance between the highest point of the upper extension piece (31) of the observation window structure and the bottom plate of the main cavity body is greater than H + L1 multiplied by cotc.

3. The observation window structure of vacuum evaporation machine according to claim 2, wherein when the distance between the lowest point of the upper extension piece (31) of the observation window structure and the bottom plate of the main cavity is greater than H + L × cotb, the lower surface of the lower extension piece (32) and the lower surface of the upper extension piece (31) block the evaporated evaporation material, and it is satisfied that the distance between the upper extension piece (31) and the lower extension piece (32) on the mounting frame (2) is equal to or less than M × cosa + M × sina × cotd, where the connecting line between the center point of the evaporation material surface in the crucible and the highest point of the lower extension piece (32) is d, the length of the lower extension piece (32) is M, and the angle between the connecting line and the vertical line of the inner wall of the cavity door is M.

4. The observation window structure of a vacuum evaporator according to any one of claims 2 to 3, wherein when observing the evaporation material in the crucible with the human eye, the light is reflected to the upper surface of the lower extension member (32) through the lower surface of the upper extension member (31), the upper surface of the lower extension member (32) is reflected to reach the outer glass (1) through the first through hole (21), the lower surface of the upper extension member (31) and the upper surface of the lower extension member (32) both have a reflection function, or the light is reflected by the lower surface of the upper extension member (31) and then directly passes through the first through hole (21) to reach the outer glass (1), the lower surface of the upper extension member (31) has a reflection function; when people observe the plating pot above the main cavity body, light directly passes through the first through hole (21) to reach the outer glass (1) after being reflected by the upper surface of the lower extension piece (32), the upper surface of the lower extension piece (32) has a reflection function, or/and the light directly passes through the first through hole (21) to reach the outer glass (1).

5. The observation window structure of the vacuum evaporator according to claim 1, wherein the observation window structure comprises one or more observation window structures, one observation window structure is arranged in the middle of the chamber door, the plurality of observation window structures are regularly distributed on the chamber door, and the position of the observation window structure, the length of the extension member (3), the inclination angle a of the extension member (3), the reflection function of the extension member (3), and the distance between the upper extension member (31) and the lower extension member (32) on the mounting frame (2) are adjusted according to actual needs.

6. The observation window structure of the vacuum evaporation machine according to claim 1, wherein the cavity door is provided with a through hole, the outer layer glass (1) is fixed at a position corresponding to the through hole of the cavity door, and the outer layer glass (1) is fixed on the outer wall of the cavity door outside the through hole of the cavity door, or on the inner wall of the cavity door inside the through hole of the cavity door, or inside the through hole of the cavity door.

7. The observation window structure of the vacuum evaporation machine according to claim 6, wherein the cavity door through hole, the outer glass (1) and the first through hole (21) of the mounting bracket (2) are one of square, rectangle, circle or ellipse, and the shapes of the cavity door through hole, the outer glass (1) and the mounting bracket (2) are the same or different.

8. The observation window structure of vacuum evaporation machine according to claim 6, further comprising a hollow fixing member (4), wherein the hollow fixing member (4) is used for fixing the outer glass (1) to the cavity door, the hollow fixing member (4) is fixed to the cavity door by screws, and the shape of the hollow portion of the hollow fixing member (4) is the same as the shape of the outer glass (1).

9. The observation window structure of a vacuum evaporation machine according to claim 1, wherein the mounting frame (2) further comprises a chamber door fixing portion (22) and an extension member fixing portion (23), the first through hole (21) is disposed on the chamber door fixing portion (22), the chamber door fixing portion (22) is fixed to the chamber door, the extension member fixing portion (23) is located in the main chamber, and the extension member fixing portion (23) is connected to the extension member (3).

10. The observation window structure of a vacuum evaporator according to claim 9, wherein the extension fixing part (23) and the extension member (3) are fixed by screws or bolts, and the inclination angle a of the extension member (3) can be adjusted by an external force by adjusting the tightness of the screws or bolts.