Method for coating metal film on C-shaped edge of planar optical window

Abstract

The invention discloses a plane optical window sheet C-shaped edge metal film coating method, which relates to the technical field of optics and comprises the steps of pretreatment, adhesive connection, rotary positioning, shielding, film coating and window sheet taking-out and storage. According to the method, disc coating can be achieved, the positioning structures correspond to the window pieces one to one, and batch window piece positioning can be achieved. During coating, the positioning ring is controlled to ascend and descend in a rotating mode, operation is convenient and fast, double-face chamfering and cylindrical surface leakage are guaranteed to complete metallization coating, and the coating efficiency is improved.

Description

Technical Field

[0001] The present invention relates to the field of optical technology, and in particular to a method for coating a C-shaped edge metal film on a plane optical window. Background Art

[0002] Edge metal film fabrication technology has been widely used in a variety of fields, including aerospace, defense, healthcare, and semiconductor manufacturing. In practical applications, metal films are applied to the edges of planar optical windows to impart electrical conductivity to optical lenses. Combined with the conductive film coated on the surface of the planar optical windows, these films can defrost and defrost in harsh weather conditions such as frost and fog. Furthermore, planar optical windows are often welded to the device to prevent water from entering the mirror cavity and achieve a hermetic seal.

[0003] Patent CN116855889A, "A Method for Preparing Spherical Conductive Films and Electrodes on Optical Glass Substrates," describes an electrode plating tooling method in which a spherical bulge matching the optical glass is fixedly mounted in the center of a circular through-hole in the coating tooling. Two symmetrical electrode holes are defined around the edge of the bulge to expose the electrode plating locations. While this method enables electrode fabrication, it fails to metallize the side surfaces and chamfers of the component. Patent CN115064599B, ​​"A Method for Preparing a Metal Film Layer for a Metallized Window for Infrared Detectors," utilizes a dispensing process to combine the window with a protective film and a pressure plate. This ensures optical film protection for the window, solves clamping issues, and fully metallizes the window's edges. While the metal film layer prepared by this method covers the window's surface and sides, the dispensing process is prone to irregular morphology in the metallized area due to glue overflow, affecting product consistency. Furthermore, the use of auxiliary tools to position the protective film during the dispensing process can result in positioning errors. Displacement of the protective film due to glue fluidity during the initial curing phase further affects positioning accuracy. Patent CN217839100U, "An Auxiliary Tooling for Metallizing Optical Windows," describes an auxiliary tooling system that sequentially places a protective film, a window to be plated, and a fixed pressure plate into corresponding slots. The protective film and the window to be plated, as well as the fixed pressure plate, are then connected using adhesive. While this method achieves precise installation of the film, window to be plated, and fixed pressure plate, achieving complete metallization of the window side, it can only position and install the protective film one part at a time, resulting in low production efficiency.

[0004] Therefore, a method for coating C-shaped edges of planar optical windows with a metal film is provided. This method can be used for disc coating, with the positioning structure corresponding to the window piece on a one-to-one basis, enabling batch positioning of windows. During coating, a rotational method is used to control the raising and lowering of the positioning ring, providing convenient and quick operation. This method ensures double-sided chamfering and cylindrical surface exposure for complete metallization coating, improving coating efficiency. Summary of the Invention

[0005] The purpose of the present invention is to provide a method for coating a C-shaped edge metal film on a planar optical window, so as to solve the problem that the metallized area of ​​the existing coating device cannot cover the double-sided chamfer, the metallized area has black edges, and affects the quality of the metal film layer and the transparency of the light-transmitting area.

[0006] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0007] A method for coating a C-shaped edge metal film on a planar optical window comprises the following steps:

[0008] Step a) Pre-treatment: Cleaning the surface of the planar optical window, the surface of the mother tray, the surface of the daughter tray, and the cylindrical surface of the supporting column;

[0009] Step b) Glue connection: A positioning ring is placed on the edge of the supporting column, and the cleaned flat optical window is placed on the positioning ring on the upper part of the supporting column. A sub-tray outside the supporting column is provided with a sunken groove, and the rectangular teeth of the positioning ring are placed in the sunken groove. The positioning ring is located on the outer side of the supporting column, and the lower surface of the flat optical window is connected to the upper surface of the supporting column by glue;

[0010] Step c) Rotational positioning: rotating the positioning ring so that the positioning ring sinks into the sinking groove, and the position of the positioning ring rises and falls in the vertical direction;

[0011] After rotation and positioning, the height of the positioning ring is below the lower surface of the flat optical window, exposing the cylindrical surface and chamfer of the flat optical window, that is, the C-shaped metallized area is required;

[0012] Step d) shielding: placing a shielding member on the surface of the planar optical window, the shielding member shielding the non-metallized area;

[0013] Step e) coating: using a sputtering coating method, controlling the sputtering power, sputtering pressure, sputtering temperature, sputtering angle, and tray speed, coating in a coating device, and coating a metal film layer on the C-shaped area at the edge of the planar optical window;

[0014] Step f) removing and storing the window: after the coating is completed, remove the shielding member, remove the flat optical window from the supporting column, and store the removed flat optical window in a drying cabinet.

[0015] Furthermore: in step a), the mother tray and the child tray are both configured as circular plate structures, the mother tray is provided with a plurality of detachable child trays, and the child trays are arranged in a honeycomb array, and the child trays are provided with a plurality of supporting columns adapted to the aperture of the flat optical window.

[0016] Further: in the step b), the lower side wall of the positioning ring is configured as a rectangular tooth knot.

[0017] Furthermore: in the step b), the bearing columns are symmetrically arranged on both sides of the sinking trough, and the bearing columns are coaxially arranged with the sinking trough;

[0018] Furthermore: in the step b), when the adhesive connection is performed, after the positioning ring is placed, a high-temperature double-sided tape is affixed to the supporting column, and then the optical window is placed in the positioning ring.

[0019] Furthermore: in the step d), the shielding member includes: a shielding sheet, a connecting rod, a positioning ring, and a bracket;

[0020] The positioning ring is set as a hollow circular ring, and connecting rods are symmetrically arranged on the positioning ring. A shielding piece is connected to one end of the connecting rod, and the shielding piece is set as a circular plate. A protrusion is set on the opposite edge of the positioning ring, and the protrusion is a bracket. The bracket is set on the outer wall of the positioning ring at the connecting rod.

[0021] Furthermore: the connecting rod is configured as a broken line, and the bending angle of the connecting rod is 60°±10°.

[0022] Furthermore: the positioning ring is embedded in the positioning groove, the positioning groove is set on the sub-tray outside the sinking groove, the edge of the positioning groove is opened with a fixing groove, and the card tray is placed in the groove for fixing.

[0023] Compared with the prior art, the present invention has at least one of the following beneficial effects:

[0024] (1) In the present invention, a positioning ring is put on the edge of the supporting column, and the cleaned flat optical window is placed on the positioning ring. The lower surface of the flat optical window is connected to the upper surface of the supporting column by adhesive. The positioning ring is rotated to sink the positioning ring into the sinking groove, and the position of the positioning ring rises and falls in the vertical direction; after rotation and positioning, the height of the positioning ring is below the lower edge of the flat optical window, exposing the cylindrical surface and chamfer of the flat optical window, that is, a C-shaped metallized area is required, and the shielding member covers the non-metallized area, and a metal film layer is plated on the C-shaped area of ​​the edge of the flat optical window; the positioning is positioned by rotation to ensure that the chamfer and cylindrical surface are exposed to complete the metallization coating, and the positioning groove set at the coaxial position of the supporting column is used to position the shielding member, ensuring the high coaxiality of the flat optical window and the shielding member, realizing the coating of the metallized area covering the double-sided chamfer, and improving the position accuracy of the metallized area; at the same time, the metallized film layer of multiple parts can be prepared, which significantly improves the production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a schematic diagram of the mother pallet structure of this application;

[0026] Figure 2 This is a schematic diagram of the sub-tray of this application;

[0027] Figure 3 This is a schematic diagram of the positioning ring of this application;

[0028] Figure 4 This is a schematic diagram of the shielding structure of the present application;

[0029] Figure 5 This is a schematic diagram of the coating operation process of this application.

[0030] In the figure: 1-mother pallet, 2-sub-pallet, 3-bearing column, 4-positioning ring, 5-shielding member, 501-shielding piece, 502-connecting rod, 503-positioning ring, 504-card holder, 6-sinking groove, 7-positioning groove, 8-groove. DETAILED DESCRIPTION

[0031] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0032] Example 1:

[0033] See also Figure 1-5 The present invention provides a method for coating a C-shaped edge metal film on a planar optical window, comprising the following steps:

[0034] Step a) Pretreatment: Clean the surface of the planar optical window, the surface of the mother tray 1, the surface of the child tray 2, and the cylindrical surface of the supporting column 3 to improve the firmness of the plated metal film layer; wherein, the mother tray 1 and the child tray 2 are both configured as circular plate structures, and a plurality of detachable child trays 2 are provided on the mother tray 1, and the child trays 2 are arranged in a honeycomb array, and a plurality of supporting columns 3 adapted to the aperture of the planar optical window are provided on the child tray 2.

[0035] Step b) Glue connection: Place a positioning ring 4 on the edge of the supporting column 3 on the sub-tray 2. The positioning ring 4 is adapted to the outer diameter of the flat optical window. The lower side wall of the positioning ring 4 is configured as a rectangular tooth structure. The sub-tray 2 is provided with a sinking groove 6 outside the supporting column 3. The sinking groove 6 is symmetrically distributed, and the supporting column 3 and the sinking groove 6 are coaxially arranged. Figure 3 , the rectangular tooth portion of the positioning ring 4 is in the sinking groove 6.

[0036] When the cleaned flat optical window is placed on the positioning ring 4, the rectangular teeth at the lower end of the positioning ring 4 are not in the sinking groove 6. The positioning ring 4 is located outside the supporting column 3. The height of the positioning ring 4 is the same as the height of the flat optical window. The lower surface of the flat optical window is connected to the upper surface of the supporting column 3 by adhesive. When the adhesive is connected, the positioning ring 4 is placed first. The flat optical window and the upper surface of the supporting column 3 are not easy to adhere. After the positioning ring 4 is placed, high-temperature double-sided tape is attached to the supporting column, and then the optical window is placed in the positioning ring 4.

[0037] Step c) Rotational positioning: Rotate the positioning ring 4 so that the positioning ring 4 sinks into the sinking groove 6, that is, the rectangular teeth at the lower end of the positioning ring 4 sink into the sinking groove 6. After the positioning ring 4 is rotated, the rectangular teeth at the lower end of the positioning ring 4 are now in the sinking groove 6. This process realizes the vertical rise and fall of the positioning ring 4.

[0038] After rotation and positioning, the height of the positioning ring 4 is below the lower surface of the planar optical window, exposing the cylindrical surface and chamfer of the planar optical window, that is, the C-shaped metallized area is required.

[0039] Step d) shielding: a shielding member 5 is placed on the surface of the planar optical window, the shielding member 5 is located above the supporting pillar 3, and the shielding member 5 shields the non-metallized area.

[0040] The shielding member 5 includes: a shielding piece 501, a connecting rod 502, a positioning ring 503, and a bracket 504. The positioning ring 503 is set as a hollow circular ring structure. The connecting rod 502 is symmetrically arranged on the positioning ring 503. The connecting rod 502 is set as a broken line type. The bending angle of the connecting rod 502 is 60°±10°. One end of the connecting rod 502 is connected to the shielding piece 501, and the shielding piece 501 is set as a circular plate. The shielding piece 501 and the positioning ring 503 are set in parallel and the shielding piece 501 and the positioning ring 503 are set coaxially. The relative edges of the positioning ring 503 are provided with protrusions, and the protrusions are the brackets 504. The brackets 504 are set on the outer wall of the positioning ring 503 at the connecting rod 502.

[0041] The diameter of the shielding piece 501 is equal to the diameter of the non-metallized area on the surface of the planar optical window, that is, the shape and size of the shielding piece 5 are the same as the shape and size of the non-metallized area.

[0042] A positioning groove 7 is provided on the sub-tray 2 outside the sinking groove 6 , and a fixing groove 8 is provided on the edge of the positioning groove 7 .

[0043] The positioning ring 503 is embedded in the positioning groove 7, and the shielding member 5 is connected to the positioning groove 7 with a clearance fit. The bracket 504 is fixed to the groove 8 to ensure that the shielding member 5 and the surface of the flat optical window are in contact without displacement or gaps during the coating process. In other words, the shielding member 5.1 is in contact with the flat optical window, the positioning ring 503 is embedded in the positioning groove 7, and the bracket 504 is placed in the groove 8 to fix it, so that the shielding member 5.1 covers the non-metallized area of ​​the flat optical window.

[0044] Step e) Coating: A sputtering coating method is used, and the sputtering power, sputtering pressure, sputtering temperature, sputtering angle, and tray speed are controlled. The coating process is completed in a coating device. During the entire process, the coating device automatically operates after setting the corresponding sputtering parameters, and a metal film layer is deposited in the C-shaped area at the edge of the flat optical window.

[0045] Step f) removing and storing the window: after the coating is completed, remove the shielding member 5 and remove the flat optical window from the supporting column 3 . The removed flat optical window can be stored in a drying cabinet.

[0046] When coating is performed using this method, a sinking groove is provided at the bottom of the supporting column of the sub-tray, and a rotation method is used for positioning, which is convenient and quick to operate, ensuring that the chamfers and cylindrical surfaces are exposed to complete metallization coating. The positioning groove provided at the coaxial position of the supporting column is used to position the shielding member, ensuring high coaxiality between the flat optical window and the shielding member, achieving 100% coating of the metallized area covering the double-sided chamfers, and improving the position accuracy of the metallized area; at the same time, the metallized film layer of multiple parts can be prepared simultaneously, significantly improving production efficiency.

[0047] Although the present invention has been described herein with reference to a number of illustrative embodiments thereof, it will be understood that numerous other modifications and implementations may be devised by those skilled in the art that fall within the scope and spirit of the principles disclosed herein. More specifically, within the scope of the present disclosure, the drawings, and the claims, numerous variations and modifications may be made to the components and / or layout of the subject combination arrangement. In addition to variations and modifications to the components and / or layout, other uses will also be apparent to those skilled in the art.

Claims

1. A method for coating a C-shaped edge metal film on a planar optical window, characterized in that: The method comprises the following steps: Step a) pre-treatment: cleaning the surface of the planar optical window, the surface of the mother tray (1), the surface of the child tray (2), and the cylindrical surface of the supporting column (3); Step b) adhesive connection: a positioning ring (4) is put on the edge of the bearing column (3), the cleaned flat optical window is placed on the positioning ring (4) on the upper part of the bearing column (3), a sinking groove (6) is provided on the sub-tray (2) outside the bearing column (3), the rectangular tooth portion of the positioning ring (4) is in the sinking groove (6), the positioning ring (4) is located outside the bearing column (3), and the lower surface of the flat optical window is connected to the upper surface of the bearing column (3) by adhesive; Step c) Rotational positioning: rotating the positioning ring (4) so ​​that the positioning ring (4) sinks into the sinking groove (6), and the position of the positioning ring (4) rises and falls in the vertical direction; After rotation and positioning, the height of the positioning ring (4) is below the lower side of the planar optical window, exposing the cylindrical surface and chamfer of the planar optical window, that is, the C-shaped metallized area is required; Step d) shielding: a shielding member (5) is placed on the surface of the planar optical window, and the shielding member (5) shields the non-metallized area; Step e) coating: using a sputtering coating method, controlling the sputtering power, sputtering pressure, sputtering temperature, sputtering angle, and tray speed, coating in a coating device, and coating a metal film layer on the C-shaped area at the edge of the planar optical window; Step f) taking out and storing the window: after the coating is completed, the shielding member (5) is removed, and the flat optical window is removed from the supporting column (3). The removed flat optical window is stored and placed in a drying cabinet.

2. The method for coating a C-shaped edge metal film on a planar optical window according to claim 1, wherein: In the step a), the mother pallet (1) and the child pallet (2) are both configured as circular plate structures, a plurality of detachable child pallets (2) are provided on the mother pallet (1), the child pallets (2) are arranged in a honeycomb array, and a plurality of supporting columns (3) are provided on the child pallets (2).

3. The method for coating a C-shaped edge metal film on a planar optical window according to claim 1, wherein: In the step b), the lower side wall of the positioning ring (4) is configured as a rectangular tooth structure.

4. The method for coating a C-shaped edge metal film on a planar optical window according to claim 1, wherein: In the step b), the sinking grooves (6) are symmetrically distributed on both sides of the bearing column (3).

5. The method for coating a C-shaped edge metal film on a planar optical window according to claim 1, wherein: In the step b), when the adhesive connection is performed, after placing the positioning ring (4), a high-temperature double-sided adhesive tape is affixed to the supporting column, and then the optical window is placed in the positioning ring (4).

6. The method for coating a C-shaped edge metal film on a planar optical window according to claim 1, wherein: In the step d), the shielding member (5) includes: a shielding sheet (501), a connecting rod (502), a positioning ring (503), and a bracket (504); The positioning ring (503) is configured as a hollow circular ring. A connecting rod (502) is symmetrically provided on the positioning ring (503). One end of the connecting rod (502) is connected to a shielding piece (501). The shielding piece (501) is configured as a circular plate. A protrusion is provided on the opposite edge of the positioning ring (503). The protrusion is a bracket (504). The bracket (504) is provided on the outer wall of the positioning ring (503) at the connecting rod (502).

7. The method for coating a C-shaped edge metal film on a planar optical window according to claim 6, wherein: The connecting rod (502) is configured as a broken line, and the bending angle of the connecting rod (502) is 60°±10°.

8. The method for coating a C-shaped edge metal film on a planar optical window according to claim 6, wherein: The positioning ring (503) is embedded in the positioning groove (7), which is arranged on the sub-tray (2) outside the sinking groove (6). A fixing groove (8) is provided on the edge of the positioning groove (7), and the card holder (504) is placed in the groove (8) for fixing.

Images