Lens glue injection method and device

Abstract

The application discloses a lens glue injection method and device, and belongs to the technical field of lens production and manufacturing. The lens glue injection method specifically comprises the following steps: S1, a glue injection needle of a glue injection mechanism sucks glue liquid in a glue liquid buffer cylinder; S2, the glue injection needle injects the glue liquid into a lens forming cavity of a forming mold; S3, when a glue injection liquid surface in the lens forming cavity reaches a preset position, a glue suction pump of the glue suction mechanism is started; and S4, a glue suction needle sucks excess glue liquid above the preset position in the lens forming cavity, and a glue suction rate of the glue suction needle is greater than a glue injection rate of the glue injection needle. The lens glue injection method can effectively avoid the occurrence of glue overflow by sucking the excess glue liquid above the preset position in the lens forming cavity by the glue suction mechanism and making the glue suction rate of the glue suction needle greater than the glue injection rate of the glue injection needle, and is favorable for improving the quality of lens products.

Description

Technical Field

[0001] This invention relates to the field of lens manufacturing technology, and in particular to a lens adhesive injection method and apparatus. Background Technology

[0002] The manufacturing process of resin lenses involves steps such as monomer formulation, mold assembly, casting, polymerization and curing, mold opening, and coating. The casting process is the key step that determines the quality of resin lenses. During casting, a liquid colloid is injected into the assembled mold, ensuring the mold is completely filled. Any issues after casting, such as incomplete filling, air bubbles in the colloid, or colloid overflow, will directly affect the quality of the finished lens, potentially rendering it a defective product.

[0003] Most existing technologies employ manual-assisted glue injection methods. During casting, operators need to visually confirm the height of the glue level to control the amount of glue injected and prevent glue overflow. This method not only has low automation and low production efficiency, but also relies heavily on the operator's experience. If the operator lacks sufficient experience, glue overflow is likely to occur, leading to a lower pass rate for eyeglass lenses and increased manufacturing costs.

[0004] Therefore, how to propose a lens glue injection method and device with a high degree of automation, high production efficiency, and the ability to avoid glue overflow is a technical problem that urgently needs to be solved. Summary of the Invention

[0005] One object of the present invention is to provide a lens adhesive injection method that can avoid adhesive overflow.

[0006] To achieve this objective, the present invention adopts the following technical solution:

[0007] A lens coating method includes the following steps:

[0008] S1: The dispensing needle of the dispensing mechanism draws the adhesive from the adhesive buffer cylinder;

[0009] S2: The injection needle injects the adhesive into the lens forming cavity of the molding mold;

[0010] S3: When the level of the adhesive liquid in the lens forming cavity reaches the preset position, start the adhesive suction pump of the adhesive suction mechanism;

[0011] S4: The suction needle draws up excess adhesive from the lens forming cavity at a preset position, and the suction rate of the suction needle is greater than the injection rate of the injection needle.

[0012] Preferably, step S3 specifically includes the following steps:

[0013] S31: The testing agency detects the level of the adhesive liquid in the lens forming cavity and determines whether the level of the adhesive liquid in the lens forming cavity has reached the preset position;

[0014] S32: If the level of the adhesive liquid in the lens forming cavity reaches a preset position, the adhesive suction pump of the adhesive suction mechanism is started.

[0015] Preferably, the following step is included after step S4:

[0016] S5: Excess adhesive flows from the adhesive suction needle into the adhesive recovery mechanism.

[0017] Preferably, the following step is included after step S5:

[0018] Start the return pump of the adhesive return mechanism, and excess adhesive will flow back from the adhesive recovery mechanism to the adhesive buffer cylinder.

[0019] Preferably, the following step is included after step S5:

[0020] Start the collection pump of the adhesive collection mechanism, and excess adhesive flows from the adhesive recovery mechanism to the collection container for temporary storage;

[0021] Excess adhesive in the collection container is manually replenished into the adhesive buffer cylinder.

[0022] Preferably, the following steps are included before step S2:

[0023] The first mold and the second mold are combined to form the molding mold.

[0024] Preferably, the following steps are included before step S2:

[0025] The height adjustment mechanism adjusts the glue injection needle and the glue suction needle to the same height position at a preset distance from the glue injection port of the lens forming cavity.

[0026] Preferably, the following step is included after step S4:

[0027] Pause the glue injection mechanism and the glue suction mechanism;

[0028] The tape bonding structure is activated, which covers the glue injection port of the lens forming cavity with tape to form a lens to be cured.

[0029] Preferably, after the tape bonding structure covers the glue inlet of the lens forming cavity with tape, the following step is further included:

[0030] The lens transfer mechanism is activated, which transfers the lens to be cured to the lens curing device.

[0031] Another objective of this invention is to provide a lens gluing device that is not only highly automated and efficient, but also avoids glue overflow.

[0032] To achieve this objective, the present invention adopts the following technical solution:

[0033] A lens gluing device that uses the above-described lens gluing method.

[0034] The beneficial effects of this invention are:

[0035] This invention provides a lens gluing method, which specifically includes the following steps: S1: The gluing needle of the gluing mechanism draws glue from the glue buffer cylinder; S2: The gluing needle injects the glue into the lens forming cavity of the molding mold; S3: When the glue level in the lens forming cavity reaches a preset position, the glue suction pump of the suction mechanism is activated; S4: The glue suction needle draws up excess glue above the preset position in the lens forming cavity, and the suction rate of the suction needle is greater than the injection rate of the glue injection needle. This lens gluing method, by utilizing the glue suction mechanism to draw up excess glue above the preset position in the lens forming cavity and ensuring that the suction rate of the suction needle is greater than the injection rate of the glue injection needle, can effectively avoid glue overflow and improve the quality of the finished lens. Attached Figure Description

[0036] Figure 1 This is a schematic diagram of the lens glue injection device provided in Embodiment 1 of the present invention;

[0037] Figure 2 This is a schematic diagram of the lens coating device provided in Embodiment 2 of the present invention;

[0038] Figure 3 This is a flowchart of the lens coating method provided in Embodiment 3 of the present invention.

[0039] In the picture:

[0040] 1. Molding mold; 101. First mold; 102. Second mold; 103. Adhesive tape;

[0041] 2. Glue dispensing mechanism; 201. Glue buffer cylinder; 202. Glue dispensing needle; 203. Glue dispensing tube; 204. Glue replenishment tube;

[0042] 3. Adhesive suction mechanism; 301. Adhesive suction pump; 302. Adhesive suction needle; 303. First adhesive suction tube; 304. Second adhesive suction tube; 305. Filtering mechanism;

[0043] 4. Adhesive recycling facility;

[0044] 5. Adhesive liquid reflux mechanism; 501. Reflux pump; 502. Reflux pipe;

[0045] 6. Adhesive collection mechanism; 601. Collection pump; 602. Collection pipe; 603. Collection container. Detailed Implementation

[0046] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0047] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. The terms "first position" and "second position" refer to two different positions.

[0048] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to fixed connections or detachable connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal connections between two components. Those skilled in the art can understand the specific meaning of these terms in this invention based on the specific circumstances.

[0049] Example 1

[0050] This embodiment provides a lens adhesive injection device that automatically injects adhesive into a molding mold 1 used to form lenses. After a certain amount of adhesive is injected, it solidifies in the molding mold 1 to form a lens. This lens adhesive injection device not only has a high degree of automation and high lens production efficiency, but also avoids adhesive overflow during the injection process.

[0051] like Figure 1As shown, the lens injection device includes a molding mold 1, an injection mechanism 2, and an injection suction mechanism 3. Specifically, the molding mold 1 is the main molding mechanism for forming the lens, and it has a lens molding cavity with an injection port to facilitate the entry of adhesive. The shape of the lens molding cavity needs to match the design shape of the lens. In this embodiment, the shape of the lens molding cavity is circular. Of course, in other embodiments, since the lens can be made into other shapes such as ellipse or polygon, the shape of the lens molding cavity can also be set to ellipse or polygon or other shapes according to the design shape of the lens.

[0052] After the lens has cured and molded, in order to facilitate lens demolding, such as Figure 1 As shown, the molding die 1 includes a first die 101 and a second die 102 disposed opposite to each other. Each of the first die 101 and the second die 102 has a molding half-cavity on its opposite side. The two molding half-cavities can be joined together to form the aforementioned lens molding cavity. Furthermore, to prevent glue leakage at the gap between the first die 101 and the second die 102, as... Figure 1 As shown, an adhesive tape 103 is also provided circumferentially around the first mold 101 and the second mold 102. The width of the adhesive tape 103 is greater than the width of the gap between the first mold 101 and the second mold 102. A portion of the adhesive tape 103 is adhered to the side wall of the first mold 101, and another portion is adhered to the side wall of the second mold 102. It should be noted that the free end of the adhesive tape 103 should be avoided from the glue injection port when being applied to avoid affecting the glue injection.

[0053] like Figure 1 As shown, the glue injection mechanism 2 is a mechanism for injecting glue into the lens forming cavity. In this embodiment, the glue injection mechanism 2 includes a glue buffer cylinder 201, a glue injection needle 202, and a glue injection tube 203. The glue buffer cylinder 201 is used to hold the glue. One end of the glue injection tube 203 is connected to the glue buffer cylinder 201, and the other end is connected to the glue injection needle 202. The glue injection needle 202 is located at the glue injection port. In this embodiment, the height of the glue buffer cylinder 201 is greater than the height of the glue injection needle 202, so that the glue can automatically flow from the glue buffer cylinder 201 into the glue injection tube 203 under the action of gravity, and finally flow into the glue injection needle 202. Of course, in other embodiments, a glue injection pump can also be installed on the glue injection tube 203 to pump the glue into the glue injection needle 202.

[0054] Optionally, the dispensing tube 203 has a smooth inner wall and a tubular structure to prevent adhesive from adhering to the inner wall of the dispensing tube 203 and causing blockage. Alternatively, a lubricating coating can be applied to the inner wall of the dispensing tube 203 to increase the flow rate of the adhesive and prevent blockage.

[0055] Further optional, such as Figure 1As shown, the glue dispensing mechanism 2 also includes a glue replenishment tube 204. One end of the glue replenishment tube 204 extends into the glue buffer cylinder 201, and the other end is connected to the glue source (not shown in the figure) so as to replenish the glue when the glue in the glue buffer cylinder 201 is insufficient. Of course, the glue can also be replenished by replacing the glue buffer cylinder 201.

[0056] like Figure 1 As shown, the adhesive suction mechanism 3 is designed to prevent adhesive from overflowing from the lens forming cavity. Specifically, the adhesive suction mechanism 3 includes an adhesive suction pump 301, an adhesive suction needle 302, and an adhesive suction tube. One end of the suction tube is connected to the adhesive suction needle 302, and the other end is connected to the adhesive suction pump 301. The adhesive suction needle 302 is also located at the adhesive suction port. When the adhesive injection needle 202 injects a preset amount of adhesive into the lens forming cavity, the adhesive level in the lens forming cavity reaches a preset position. The needle of the adhesive suction needle 302 is precisely located at this preset position. If the adhesive injection needle 202 continues to inject excess adhesive into the lens forming cavity, the adhesive suction pump 301 operates, generating a negative pressure environment. Under this negative pressure environment, the adhesive suction needle 302 can suction away the excess adhesive above the preset position, thereby preventing adhesive overflow.

[0057] Optionally, the lens gluing device further includes a height adjustment mechanism. This mechanism adjusts the height of the suction needle 302, enabling the device to suction glue from molding dies 1 of different sizes and shapes, thus expanding its application range. In this embodiment, the height adjustment mechanism can be a miniature cylinder connected to the suction needle 302 to adjust its height. Of course, other mechanisms capable of automatically adjusting height, besides miniature cylinders, are also applicable to this embodiment.

[0058] Of course, in addition to adjusting the height of the suction needle 302, the height adjustment mechanism can also adjust the height of the injection needle 202, thereby enabling the lens injection device to inject glue into molding molds 1 of different specifications and shapes, increasing the applicability of the lens injection device. In this embodiment, it is preferable to set the injection needle 202 and the suction needle 302 at the same height at the injection port to improve the quality of the final lens product.

[0059] Furthermore, to more precisely control the adhesive suction mechanism 3, the lens adhesive injection device also includes a detection mechanism. This detection mechanism detects the adhesive level within the lens forming cavity and sends an adhesive suction signal to control the adhesive suction mechanism 3 when the adhesive level reaches a preset position. This arrangement avoids the adhesive suction pump 301 of the adhesive suction mechanism 3 from being constantly operational, thus saving energy. Optionally, the detection structure can be a photoelectric sensor, infrared sensor, etc., located at a preset position.

[0060] To temporarily store excess adhesive, such as Figure 1 As shown, the lens injection device also includes an adhesive recovery mechanism 4, which is connected to the suction tube and used to recover excess adhesive absorbed by the suction needle 302 from the lens forming cavity. Specifically, in this embodiment, the suction tube includes a first suction tube 303 and a second suction tube 304. One end of the first suction tube 303 is connected to the suction needle 302, and the other end is connected to the adhesive recovery mechanism 4. One end of the second suction tube 304 is connected to the adhesive recovery mechanism 4, and the other end is connected to the suction pump 301.

[0061] Optionally, a filter mechanism 305 is provided on the second suction tube 304. This filter mechanism 305 can filter out moisture and impurities, thereby ensuring the normal operation of the suction pump 301 and the entire device. The filter mechanism 305 can adopt a structure that can filter moisture and impurities in the prior art, which will not be described in detail here.

[0062] Furthermore, in order to achieve the reuse of excess adhesive and thus avoid adhesive waste, such as... Figure 1 As shown, the lens adhesive filling device also includes an adhesive return mechanism 5, which includes a return pump 501 and a return pipe 502. One end of the return pipe 502 is connected to the adhesive recovery mechanism 4, and the other end is connected to the adhesive buffer cylinder 201. The return pump 501 is mounted on the return pipe 502. Under the action of the return pump 501, the adhesive temporarily stored in the adhesive recovery mechanism 4 can re-enter the adhesive buffer cylinder 201 through the return pipe 502, replenishing the adhesive in the adhesive buffer cylinder 201 while avoiding waste of adhesive.

[0063] Furthermore, the lens injection device also includes a tape bonding structure (not shown in the figure). After the injection is completed in the lens molding cavity, the tape bonding structure can attach the free end of the tape 103 located at the injection port to the injection port to avoid glue overflow during the transfer of the molding mold 1 to the glue curing device.

[0064] In this embodiment, the lens gluing device also includes a control mechanism, which can be a centralized or distributed controller. For example, the controller can be a single microcontroller or a combination of multiple distributed microcontrollers. The microcontroller can run a control program to control the glue suction pump 301, the return pump 501, the height adjustment mechanism, the tape bonding structure, and the detection mechanism to achieve their functions.

[0065] Example 2

[0066] This embodiment provides a lens gluing device, which is basically the same as the lens gluing device in Embodiment 1, except that the lens gluing device in this embodiment uses a glue collection mechanism 6 instead of a glue return mechanism 5.

[0067] Specifically, such as Figure 2 As shown, the adhesive collection mechanism 6 includes a collection pump 601, a collection pipe 602, and a collection container 603. One end of the collection pipe 602 is connected to the adhesive recovery mechanism 4, and the other end is connected to the collection container 603. The collection pump 601 is mounted on the collection pipe 602. Under the action of the collection pump 601, excess adhesive flows from the adhesive recovery mechanism 4 into the collection container 603 through the collection pipe 602. Once the amount of adhesive in the collection container 603 reaches a certain level, the adhesive in the collection container 603 can be manually poured into the adhesive buffer cylinder 201 to replenish the adhesive in the adhesive buffer cylinder 201.

[0068] Example 3

[0069] Based on Embodiments 1 and 2, this embodiment provides a lens adhesive injection method, such as... Figure 3 As shown, the lens coating method specifically includes the following steps:

[0070] S1: The glue injection needle 202 of the glue injection mechanism 2 draws glue from the glue buffer cylinder 201;

[0071] S2: The glue injection needle 202 injects the glue into the lens forming cavity of the molding mold 1;

[0072] S3: When the level of the adhesive liquid in the lens forming cavity reaches the preset position, start the adhesive suction pump 301 of the adhesive suction mechanism 3;

[0073] S4: The suction needle 302 draws up excess adhesive from the lens forming cavity above a preset position. The suction rate of the suction needle 302 is greater than the injection rate of the injection needle 202.

[0074] By utilizing the above-described lens gluing method, after the glue level in the glue-filling mechanism 2 reaches a preset position during the glue-filling process into the lens forming cavity, the suction mechanism 3 promptly removes any excess glue injected by the glue-filling mechanism 2, thereby preventing glue overflow within the lens forming cavity. Furthermore, compared to manual glue filling in the prior art, the above-described lens gluing method has a high degree of automation, does not depend on the experience level of the glue-filling worker, and is beneficial for improving the glue filling rate and the quality of the finished lens.

[0075] Optionally, the following steps may be included before step S2 above:

[0076] The first mold 101 and the second mold 102 are combined to form the molding mold 1.

[0077] This step can occur between steps S1 and S2, or before step S1, as long as it occurs before the dispensing needle 202 begins dispensing.

[0078] Optionally, the following steps may be included before step S2 above:

[0079] The height adjustment mechanism adjusts the glue injection needle 202 and the glue suction needle 302 to the same height position as the preset distance from the glue injection port of the lens forming cavity.

[0080] By adjusting the dispensing needle 202 and the suction needle 302 using a height adjustment mechanism, the dispensing needle 202 and the suction needle 302 can be positioned at a preset level of the dispensing liquid, thereby improving the quality of the final lens product. Optionally, the height adjustment mechanism can be a miniature cylinder connected to the dispensing needle 202 and the suction needle 302.

[0081] This step can occur at any step before step S2, as long as it is before the glue injection needle 202 injects glue and the glue suction needle 302 suctions glue.

[0082] Optionally, S3 specifically includes the following steps:

[0083] S31: The testing agency detects the level of the adhesive liquid in the lens forming cavity and determines whether the level of the adhesive liquid in the lens forming cavity has reached the preset position;

[0084] S32: If the level of the adhesive liquid in the lens forming cavity reaches the preset position, the adhesive suction pump 301 of the adhesive suction mechanism 3 will be activated.

[0085] Using a detection mechanism to obtain the adhesive level is not only convenient and highly precise, but also minimizes adhesive overflow and energy waste. The detection mechanism communicates with the control mechanism, sending information about the adhesive level. The control mechanism can control the opening and closing of the suction pump 301, ensuring timely operation and preventing energy waste. The detection mechanism can be a photoelectric sensor or infrared sensor located at the position; these are existing sensors, and their specific structures are not detailed here. Alternatively, without a detection mechanism, the suction pump 301 can remain continuously operational, and when the adhesive level in the lens forming cavity exceeds a preset position, the suction needle 302 at the preset position will directly begin suction.

[0086] Furthermore, following step S4 above, the following steps are also included:

[0087] S5: Excess adhesive flows from the suction needle 302 into the adhesive recovery mechanism 4.

[0088] By setting up an adhesive recycling mechanism 4, excess adhesive can be recycled for later reuse, avoiding waste of adhesive, which is not only environmentally friendly but also reduces the manufacturing cost of lenses.

[0089] Furthermore, the following steps are included after S5:

[0090] Start the return pump 501 of the adhesive return mechanism 5, and the excess adhesive flows back from the adhesive recovery mechanism 4 to the adhesive buffer cylinder 201.

[0091] If the adhesive return mechanism 5 is not activated, the following steps can be added after S5:

[0092] Start the collection pump 601 of the adhesive collection mechanism 6, and the excess adhesive flows from the adhesive recovery mechanism 4 to the collection container 603 for temporary storage;

[0093] Excess adhesive in collection container 603 is manually replenished into adhesive buffer cylinder 201.

[0094] Both the adhesive return mechanism 5 and the adhesive collection mechanism 6 can add excess adhesive from the adhesive recovery mechanism 4 back into the adhesive buffer cylinder 201 to replenish the adhesive in the adhesive buffer cylinder 201.

[0095] Optionally, the following steps may be included after S4:

[0096] Suspend glue injection mechanism 2 and glue suction mechanism 3;

[0097] The tape bonding structure is activated, which covers the glue injection port of the lens forming cavity with tape 103 to form the lens to be cured.

[0098] After the glue dispensing mechanism 2 and the glue suction mechanism 3 stop, the glue dispensing port is covered with tape 103 to prevent glue overflow at the dispensing port during the subsequent transfer of the lens to be cured. Optionally, the tape bonding structure includes a push-pull mechanism and a bonding roller. The push-pull mechanism drives the bonding roller to move, thereby bonding the tape 103 to the glue dispensing port.

[0099] Further, the lens transfer mechanism is activated, which transfers the lens to be cured to the lens curing device.

[0100] Alternatively, the lens transfer mechanism can be a gripping mechanism such as a robotic arm. The specific structure of the robotic arm is existing technology and will not be described in detail here.

[0101] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. A method for applying adhesive to lenses, characterized in that, Includes the following steps: S1: The dispensing needle (202) of the dispensing mechanism (2) draws the adhesive liquid from the adhesive liquid buffer cylinder (201); S2: The injection needle (202) injects the adhesive into the lens forming cavity of the molding mold (1); S3: When the level of the adhesive liquid in the lens forming cavity reaches the preset position, start the adhesive suction pump (301) of the adhesive suction mechanism (3); S4: The suction needle (302) sucks up the excess glue in the lens forming cavity above the preset position, and the suction rate of the suction needle (302) is greater than the injection rate of the injection needle (202). S5: Excess adhesive flows from the adhesive suction needle (302) into the adhesive recovery mechanism (4); S3 specifically includes the following steps: S31: The testing agency detects the level of the adhesive liquid in the lens forming cavity and determines whether the level of the adhesive liquid in the lens forming cavity has reached the preset position; S32: If the level of the adhesive liquid in the lens forming cavity reaches a preset position, the detection mechanism sends an adhesive suction signal to control the adhesive suction mechanism (3) to start the adhesive suction pump (301) of the adhesive suction mechanism (3).

2. The lens coating method according to claim 1, characterized in that, The following steps are included after S5: Start the return pump (501) of the adhesive return mechanism (5), and the excess adhesive flows back from the adhesive recovery mechanism (4) to the adhesive buffer cylinder (201).

3. The lens coating method according to claim 1, characterized in that, The following steps are included after S5: Start the collection pump (601) of the adhesive collection mechanism (6), and the excess adhesive flows from the adhesive recovery mechanism (4) to the collection container (603) for temporary storage; Excess adhesive in the collection container (603) is manually replenished into the adhesive buffer cylinder (201).

4. The lens coating method according to claim 1, characterized in that, The following steps are included before S2: The first mold (101) and the second mold (102) are joined together to form the molding mold (1).

5. The lens coating method according to claim 1, characterized in that, The following steps are included before S2: The height adjustment mechanism adjusts the glue injection needle (202) and the glue suction needle (302) to the same height position at a preset distance from the glue injection port of the lens forming cavity.

6. The lens coating method according to claim 1, characterized in that, The following steps are included after S4: Pause the glue injection mechanism (2) and the glue suction mechanism (3); The tape bonding structure is activated, which covers the glue injection port of the lens forming cavity with tape (103) to form a lens to be cured.

7. The lens coating method according to claim 6, characterized in that, After the tape bonding structure covers the glue inlet of the lens forming cavity with tape (103), the following steps are also included: The lens transfer mechanism is activated, which transfers the lens to be cured to the lens curing device.

8. A lens coating device, characterized in that, Use the lens coating method according to any one of claims 1-7.

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