Method of bonding a parabolic mirror

Abstract

The present application relates to a kind of bonding method of parabolic mirror, comprising: bonding isolation band on the inner wall of main mirror chamber, placing parabolic mirror in main mirror chamber, and adjusting the gap between main mirror chamber and parabolic mirror;The gap between main mirror chamber and parabolic mirror is injected glue;Remove isolation band, and then glue injection is carried out again.The method of the present application avoids the change of parabolic mirror surface caused by the shrinkage tension of glue solution during glue drying process, so as to ensure that the bonded parabolic mirror wavefront surface meets the design requirements.

Description

Technical Field

[0001] This invention relates to the field of optical instrument assembly and adjustment technology, and specifically to a bonding method for a parabolic mirror. Background Technology

[0002] In a coaxial reflective system consisting of a primary and secondary mirrors, an interferometer is generally used to measure the wavefront aberration of the system for adjustment. If the wavefront aberration of the primary mirror is poor during the adjustment process, it will directly affect the overall wavefront aberration of the system.

[0003] To ensure the wavefront aberration of the telescope system, it is crucial to maintain the correct wavefront profile of the primary mirror after assembly and adjustment. Current methods involve directly bonding the parabolic mirror to the primary mirror chamber using adhesive. However, directly connecting the primary mirror chamber and the parabolic mirror with adhesive can cause changes in the parabolic mirror's surface profile due to the shrinkage and tension of the adhesive during drying. This affects the wavefront profile of the parabolic mirror, leading to poor bonding quality and making it difficult to guarantee that the bonded objective mirror meets the wavefront profile requirements.

[0004] Therefore, a bonding method for parabolic mirrors is needed to solve the above problems. Summary of the Invention

[0005] This invention provides a method for bonding a parabolic objective lens. The method involves isolating the primary mirror chamber and the parabolic objective lens with a separating tape, injecting adhesive into the gap between them, removing the separating tape, and then injecting different types of adhesive through the injection hole. This allows the two adhesives to bond together, thus avoiding changes in the parabolic objective lens's surface shape caused by shrinkage tension during adhesive drying. This solves the problem of existing methods that directly connect the primary mirror chamber and the parabolic objective lens with adhesive, which lead to changes in the parabolic objective lens's surface shape due to adhesive shrinkage tension during drying, affecting the wavefront profile of the parabolic objective lens and resulting in poor bonding quality, making it difficult to ensure that the bonded objective lens meets the wavefront profile requirements.

[0006] The bonding method for a parabolic mirror according to the present invention adopts the following technical solution: including:

[0007] The isolation tape is adhered to the inner wall of the endoscope chamber, leaving a hole for glue injection;

[0008] Apply the first adhesive primer to the outer peripheral surface of the parabolic mirror;

[0009] Place the parabolic mirror in the master mirror chamber and adjust the parabolic mirror to make the gap between the parabolic mirror and the master mirror chamber uniform;

[0010] After mixing the first adhesive solution with its catalyst, inject it into the gap between the outer periphery of the parabolic mirror and the inner wall of the main mirror chamber until the gap is filled; after the adhesive dries, remove the parabolic mirror with adhesive spots on its outer periphery.

[0011] Remove the isolation strip and place the parabolic mirror with adhesive spots into the main mirror chamber. Inject the second adhesive and wait for the adhesive to dry to obtain the bonded parabolic mirror.

[0012] The first adhesive and the second adhesive are different.

[0013] Preferably, the first adhesive solution is RTV88 adhesive, and the RTV88 adhesive and its catalyst are mixed at a ratio of 200:1.

[0014] Preferably, the second adhesive is made of 703 silicone rubber.

[0015] Preferably, at least three shims of the same thickness are placed in the gap between the parabolic mirror and the main mirror chamber to adjust the position of the parabolic mirror so that the gap between the parabolic mirror and the main mirror chamber is uniform.

[0016] Preferably, the gasket is a polytetrafluoroethylene gasket.

[0017] Preferably, after removing the parabolic objective lens with adhesive spots on its outer periphery, the adhesive in the glue injection hole of the main mirror chamber is removed.

[0018] Preferably, the isolation strip is paper tape.

[0019] The beneficial effects of this invention are:

[0020] By using two different adhesives in combination, the maximum performance of both adhesives is achieved, resulting in a more reliable bond between the parabolic mirror and the primary mirror chamber. First, the primary mirror chamber and the parabolic mirror are isolated with a barrier tape, and adhesive is injected into the gap between them. Then, the barrier tape is removed, and different types of adhesives are injected through the injection hole, bonding the two different adhesives together. This avoids changes in the parabolic mirror's surface shape caused by shrinkage tension during adhesive drying, thus preventing the parabolic mirror bonded using this method from being affected by changes in its surface shape due to shrinkage tension during adhesive drying. This ensures that the wavefront shape of the parabolic mirror meets design requirements. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is a flowchart of a method for bonding a parabolic mirror according to the present invention;

[0023] Figure 2 This is a schematic diagram of the main mirror chamber in a bonding method for a parabolic mirror according to the present invention.

[0024] Figure 3 This is a schematic diagram of the structure of a parabolic mirror in a bonding method for a parabolic mirror according to the present invention.

[0025] Figure 4 This is a schematic diagram of the structure of the RTV88 adhesive spot 3 and the 703 silicone rubber adhesive spot formed after adhesive injection in the bonding method of a parabolic mirror of the present invention.

[0026] In the diagram: 1. Primary mirror chamber; 2. Parabolic mirror; 3. RTV88 adhesive spot; 4. Silicone rubber adhesive spot; a. Inner wall surface; b. Outer peripheral surface; c. Injection hole. Detailed Implementation

[0027] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. 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.

[0028] An embodiment of the bonding method for a parabolic mirror according to the present invention, such as... Figure 1 As shown, it includes:

[0029] S1. Adhere isolation tape to the inner wall of the main endoscope chamber;

[0030] Specifically, the isolation tape is adhered to the inner wall of the endoscope chamber, leaving a hole for glue injection.

[0031] S2. Place the parabolic mirror in the master mirror chamber and adjust the gap between the master mirror chamber and the parabolic mirror;

[0032] Specifically, a first adhesive primer is applied to the outer peripheral surface of the parabolic mirror. In this embodiment, it is RTV88 adhesive primer, and the type of RTV88 adhesive primer is SS4004P. The parabolic mirror is then placed in the main mirror chamber, and the parabolic mirror is adjusted to make the gap between the parabolic mirror and the main mirror chamber uniform. In this embodiment, three shims of the same thickness are placed in the gap between the parabolic mirror and the main mirror chamber to adjust the position of the parabolic mirror so that the gap between the parabolic mirror and the main mirror chamber is uniform. Specifically, the shims are polytetrafluoroethylene shims.

[0033] S3. Fill the gap between the primary mirror chamber and the parabolic mirror with glue;

[0034] Specifically, the first adhesive (RTV88 adhesive) is mixed with its catalyst and then injected into the gap between the outer periphery of the parabolic mirror and the inner wall of the main mirror chamber until the gap is filled. After the adhesive dries, the parabolic mirror with adhesive spots on its outer periphery is removed. In this embodiment, the RTV88 adhesive and its catalyst are mixed at a ratio of 200:1, and after the parabolic mirror with adhesive spots on its outer periphery is removed, the adhesive in the injection hole of the main mirror chamber is cleaned.

[0035] S4. Remove the isolation strip and then apply adhesive.

[0036] Specifically, the isolation strip is removed, and the parabolic mirror with adhesive spots is placed into the main mirror chamber. The second adhesive is injected, and after the adhesive dries, the bonded parabolic mirror is obtained. The second adhesive is made of 703 silicone rubber. The first and second adhesives are different.

[0037] Furthermore, this embodiment takes the primary mirror in the telescope system as an example. In the specific telescope system, the primary mirror is a parabolic mirror, so it is referred to as a parabolic mirror in this embodiment.

[0038] Step 1, as follows Figure 2 As shown, a 0.1mm thick paper tape is adhered to the inner wall surface a of the master lens chamber 1 to ensure uniformity and flatness and expose the glue injection hole c.

[0039] Step 2, as follows Figure 3 As shown, an RTV88 primer is applied to the outer peripheral surface b of the parabolic mirror 2. The parabolic mirror 2 coated with the RTV88 primer is then placed into... Figure 2 In the primary mirror chamber 1, a 0.3mm thick polytetrafluoroethylene gasket is inserted into the gap between the parabolic mirror 2 and the primary mirror chamber 1 to make the gap between the parabolic mirror 2 and the primary mirror chamber 1 uniform.

[0040] Step 3: Mix the RTV88 adhesive and its catalyst at a ratio of 100g:0.5g, then... Figure 2 The adhesive is injected into the injection hole c, filling the gap between the parabolic mirror 2 and the main mirror chamber 1; after the adhesive dries, it forms a shape like... Figure 4 After the RTV88 adhesive spot 3 has dried for 24 hours, the parabolic lens 2 with the RTV88 adhesive spot 3 attached to its outer periphery can be removed.

[0041] Step 4, Figure 2 Remove the masking tape from the inner wall surface a of the primary mirror chamber 1, and clean the adhesive from the injection hole c. Then, place the parabolic objective lens 2, with the RTV88 adhesive spot 3 adhered to its outer periphery, into the chamber and use a 1ml syringe to... Figure 2 0.08 ml of 703 silicone rubber adhesive is injected into the injection hole c shown. After the adhesive dries, it forms a shape like... Figure 4 The silicone rubber adhesive spot 4 in the middle, the finally bonded parabolic lens as shown Figure 1As shown, when using an interferometer to measure the wavefront profile of a bonded parabolic mirror, the root mean square (RMS) of the wavefront profile needs to meet the design requirement of RMS≤0.02λ, that is, the root mean square of the wavefront profile is less than or equal to 0.02λ, where λ represents the measurement wavelength of the interferometer (i.e., the wavelength of visible light).

[0042] Specifically, a comparison of the wavefront shape measurement results of the bonded parabolic mirror obtained using this embodiment with the wavefront shape measurement results of the parabolic mirror obtained using existing bonding techniques is shown in Table 1:

[0043] Table 1

[0044]

[0045]

[0046] As shown in Table 1, the root mean square (RMS) of the wavefront profile of the bonded parabolic mirror obtained by the existing technical methods is greater than 0.02λ, while the RMS of the wavefront profile of the parabolic mirror obtained by the method of the present invention is less than or equal to 0.02λ. That is, the bonding method of the present invention ensures that the wavefront profile of the bonded parabolic mirror meets the design requirements, thus ensuring the bonding quality of the parabolic mirror.

[0047] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A method for bonding a parabolic mirror, characterized in that, include: The isolation tape is adhered to the inner wall of the endoscope chamber, leaving a hole for glue injection; Apply the first adhesive primer to the outer peripheral surface of the parabolic mirror; Place the parabolic mirror in the master mirror chamber and adjust the parabolic mirror to make the gap between the parabolic mirror and the master mirror chamber uniform; After mixing the first adhesive with its catalyst, it is injected into the gap between the outer periphery of the parabolic mirror and the inner wall of the main mirror chamber until the gap is filled. After the glue dries, remove the parabolic lens with glue spots on its outer periphery; Remove the isolation strip and place the parabolic mirror with adhesive spots into the main mirror chamber. Inject the second adhesive to bond the first and second adhesives together. After the adhesive dries, you will get the bonded parabolic mirror. The first adhesive and the second adhesive are different.

2. The bonding method for a parabolic mirror according to claim 1, characterized in that, The first adhesive solution uses RTV88 adhesive, which is mixed with its catalyst at a ratio of 200:

1.

3. The bonding method for a parabolic mirror according to claim 1, characterized in that, The second adhesive uses 703 silicone rubber.

4. The bonding method for a parabolic mirror according to claim 1, characterized in that, Place at least three shims of the same thickness in the gap between the parabolic mirror and the primary mirror chamber to adjust the position of the parabolic mirror so that the gap between the parabolic mirror and the primary mirror chamber is uniform.

5. The bonding method for a parabolic mirror according to claim 4, characterized in that, The gasket is made of polytetrafluoroethylene.

6. The bonding method for a parabolic mirror according to claim 1, characterized in that, After removing the parabolic objective lens with adhesive residue on its outer periphery, remove the adhesive residue from the glue injection hole in the main mirror chamber.

7. The bonding method for a parabolic mirror according to claim 1, characterized in that, The isolation tape is made of paper tape.

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