A primary mirror cone sleeve bonding optical axis positioning device and positioning method

Abstract

A main mirror cone sleeve bonding optical axis positioning device and positioning method belongs to the field of optical precision instrument assembly and adjustment technology. The present invention processes a plane at the edge of the main mirror reflection surface so that the plane is parallel to the optical axis processing reference plane; and provides bosses on the upper and lower end faces of the positioning fixture, the lower end face boss contacts the marble table, and the upper end face boss is connected to the main mirror triangular back plate fixture. Through the parallelism of the upper end face boss and the lower end face boss, the main mirror optical axis processing reference plane is transferred to the main mirror triangular back plate fixture connection surface, thereby transferring the main mirror optical axis processing reference plane to the main mirror three-point flexible joint end face, and by providing a boss on the main mirror triangular back plate fixture so that it is connected and fixed with the flexible joint cone sleeve assembly, the three-point flexible joint is realized to be coplanar. At the same time, it is ensured that the flexible joint end face is parallel to the main mirror processing reference plane, the verticality of the main mirror optical axis and the back plate end face is controlled, and the reference transfer of the optical axis is realized. The present invention is suitable for positioning the main mirror cone sleeve bonding optical axis of a telescopic system.

Description

Technical Field

[0001] The invention belongs to the technical field of optical precision instrument assembly and adjustment, and particularly relates to a main mirror cone sleeve bonding optical axis positioning device and a positioning method. Background Art

[0002] The primary mirror support structure for the telescope system of an aerial camera can be implemented in a variety of ways, primarily encompassing three types: peripheral support, central support, and three-point back support. Regardless of the support method, the primary mirror and supporting structure are essentially secured by adhesive bonding. The primary mirror serves as the reference for system assembly and adjustment, and its optical axis forms the basis of the system's optical axis. Therefore, the bonding process between the primary mirror and the supporting structure requires the use of a positioning device to maintain optical axis alignment.

[0003] The existing patent document published on October 29, 2024: CN118859442A, discloses a main mirror cone sleeve bonding positioning device and method. This method uses the inner limit of the double-layer annular groove to realize the positioning of the flexible joint end face mounting hole. However, the device and method have certain defects and deficiencies, mainly including: First, it cannot ensure that the three-point flexible joint end faces are coplanar, and after the main mirror back plate is installed, the mirror will be pulled, causing the mirror surface shape to deteriorate. Second, it cannot ensure that the plane established by the three-point flexible joint end faces is parallel to the main mirror back processing reference plane, the reference transfer of the optical axis is not realized, and the position relationship between the main mirror optical axis and the triangular back plate mounting surface cannot be controlled. In response to the above shortcomings, the present invention provides a bonding device and method, which can ensure the precise positioning of the optical axis and the triangular back plate mounting surface during the cone sleeve bonding process. Summary of the Invention

[0004] The purpose of the present invention is to provide a main mirror cone sleeve bonding optical axis positioning device and positioning method, which can achieve the coplanarity of the three-point flexible joint end faces, and at the same time ensure that the flexible joint end face is parallel to the main mirror processing reference plane, control the verticality of the main mirror optical axis and the back plate end face, and realize the reference transfer of the optical axis.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] The present invention provides a primary mirror cone sleeve bonding optical axis positioning device, the positioning device comprises a marble platform, a positioning tool, a curved surface positioning block, a flat surface positioning block, a primary mirror, a flexible cone sleeve assembly and a primary mirror triangular back plate tool;

[0007] The positioning fixture is a closed ring structure consisting of two straight lines and two semicircles, and a curved positioning block is installed on each of the two semicircles, and a flat positioning block is installed on any straight line;

[0008] The primary mirror is used to be set in the positioning fixture through the arc positioning block and the plane positioning block;

[0009] The flexible cone sleeve assembly is installed in the cone hole corresponding to the primary mirror;

[0010] The upper and lower end faces of the positioning fixture are respectively provided with three bosses. The three bosses on the lower end face are used to be placed on the marble platform, and the three bosses on the upper end face are used to connect with the primary mirror triangular back plate fixture.

[0011] There are 6 bosses on the triangular back plate tooling of the primary mirror, including 3 circular bosses and 3 rectangular bosses. The 3 circular bosses correspond to the positions of the cone holes of the primary mirror, and the 3 rectangular bosses correspond to the positions of the 3 bosses on the upper end face of the positioning tooling.

[0012] Furthermore, the three bosses on the upper end face of the positioning tooling are coplanar, forming plane C, and the flatness is within 0.003mm; the three bosses on the lower end face are coplanar, forming plane D, and the flatness is within 0.003mm; taking plane D as the reference, the parallelism between plane C and plane D is less than 0.01mm.

[0013] Furthermore, the positioning fixture forms a combination with the arc surface positioning block and the plane positioning block, the verticality of the positioning surface of the combination to the plane D is within 0.01mm, and the gap between the positioning surface and the outer circle of the primary mirror is 0.05mm.

[0014] Furthermore, the outer circle of the primary mirror cooperates with the arc-surface positioning block, and the straight edge of the primary mirror cooperates with the plane positioning block.

[0015] Furthermore, the materials of the arc surface positioning block and the plane positioning block are both polytetrafluoroethylene, which prevents the positioning blocks from damaging the primary mirror.

[0016] Furthermore, the back of the primary mirror is a machining reference plane, namely plane A, and with plane A as the reference, the vertical deviation between the optical axis of the primary mirror and plane A does not exceed 30″;

[0017] The edge of the primary mirror's reflective surface is chamfered without affecting the clear aperture, and the parallelism between the chamfered plane B and plane A is within 0.01 mm.

[0018] Furthermore, the three circular bosses are coplanar, namely plane F, with a flatness within 0.003 mm; the three rectangular bosses are coplanar, namely plane E, with a flatness within 0.003 mm; taking plane E as a reference, the parallelism between plane E and plane F is less than 0.01 mm.

[0019] Furthermore, the device also includes a cone sleeve bonding rod tooling;

[0020] The cone sleeve bonding rod tooling is used to install the flexible cone sleeve assembly in the corresponding cone hole of the primary mirror.

[0021] The present invention also provides a positioning method based on the above-mentioned primary mirror cone sleeve bonding optical axis positioning device, the method comprising the following steps:

[0022] Step 1: Clean the marble surface and the D plane of the positioning tool with alcohol. Place the positioning tool on the marble platform, with the plane D of the lower end face of the positioning tool in contact with the upper end face of the marble platform.

[0023] Step 2: Install the primary mirror into the positioning fixture, and ensure that plane B of the primary mirror is in full contact with the marble surface;

[0024] Step 3: Fix the positioning fixture and the marble platform, and transfer the primary mirror optical axis reference plane to plane C of the positioning fixture;

[0025] Step 4: Use the cone sleeve bonding rod tooling to install the flexible cone sleeve assembly in the corresponding cone hole of the primary mirror;

[0026] Step 5: Fix the primary mirror triangular back plate fixture and the flexible cone sleeve assembly;

[0027] Step 6: Press down the primary mirror triangular back plate fixture until plane E is confirmed to be in full contact with plane C on the upper end face of the positioning fixture;

[0028] Step 7: The primary mirror optical axis reference plane is transferred to plane E;

[0029] Step 8: Plane E and plane F of the primary mirror back plate fixture are parallel, so that the optical axis reference plane is transferred to plane F. At the same time, plane F is in full contact with the end face of the three-point flexible cone sleeve assembly, completing the coplanarity of the end faces of the three-point flexible cone sleeve assembly.

[0030] Step 9: The plane H established by the end face of the three-point flexible cone sleeve assembly is parallel to the primary mirror processing reference plane A, completing the reference transfer perpendicular to the primary mirror optical axis and the plane established by the end face of the three-point flexible cone sleeve assembly.

[0031] Compared with the prior art, the present invention has the following beneficial effects:

[0032] 1. The present invention provides a primary mirror cone sleeve bonding optical axis positioning device and positioning method thereof. The device includes a primary mirror, a positioning tool, a combination of a curved surface positioning block and a flat surface positioning block, a flexible cone sleeve assembly, and a primary mirror triangular back plate tool. The flexible cone sleeve assembly is installed in the corresponding conical hole of the primary mirror. A plane is machined on the edge of the primary mirror's reflective surface to make the plane parallel to the optical axis machining reference plane. Bosses are provided on the upper and lower end faces of the positioning tool, the lower end face boss contacts a marble table, and the upper end face boss is connected to the primary mirror triangular back plate tool. The parallelism of the upper and lower end face bosses transfers the primary mirror optical axis machining reference plane to the primary mirror triangular back plate tool connection surface, thereby transferring the primary mirror optical axis machining reference plane to the primary mirror three-point flexible end face.

[0033] Furthermore, by providing a boss on the primary mirror triangular back plate tooling, it is connected and fixed with the flexible cone sleeve assembly, thereby achieving the coplanarity of the three-point flexible joint.

[0034] Furthermore, the plane H established by the end face of the three-point flexible cone sleeve assembly is parallel to the main mirror back processing reference plane A, and the reference transfer perpendicular to the plane established by the three-point flexible joint end face is achieved.

[0035] The invention is suitable for positioning the bonding optical axis of the main mirror cone sleeve of the telescopic system in an aerial camera. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following is a brief introduction to the drawings required for use in the specific embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0037] Figure 1 This is a schematic diagram of the taper sleeve bonding and positioning according to the present invention;

[0038] Figure 2 It is a schematic diagram of the optical axis processing reference surface of the present invention;

[0039] Figure 3 This is a schematic diagram of the combination of the positioning fixture and the positioning block of the present invention;

[0040] Figure 4 Schematic diagram of the lower end face boss of the positioning tooling of the present invention;

[0041] Figure 5 Schematic diagram of the cone sleeve bonding according to the present invention;

[0042] Figure 6 It is a schematic diagram of the primary mirror support structure after installation according to the present invention.

[0043] Among them, 1 represents the marble platform, 2 represents the positioning tooling, 3 represents the arc positioning block, 4 represents the plane positioning block, 5 represents the main mirror, 6 represents the flexible cone sleeve assembly, 7 represents the cone sleeve bonding rod tooling, and 8 represents the main mirror triangular back plate tooling. DETAILED DESCRIPTION

[0044] In the following description, specific details such as specific system structures and technologies are provided for illustration rather than limitation to facilitate a thorough understanding of the embodiments of the present application. However, it should be clear to those skilled in the art that the present application may be implemented in other embodiments without these specific details. In other cases, detailed descriptions of well-known systems, devices, circuits, and methods are omitted to avoid obstructing the description of the present application with unnecessary details.

[0045] The specific embodiments of the present invention are further described in detail below with reference to the accompanying drawings and examples. The following examples will help those skilled in the art to further understand the present invention, but are not intended to limit the present invention in any form. It should be noted that, for those skilled in the art, several changes and improvements can be made without departing from the scope of the present invention, and these all fall within the scope of protection of the present invention.

[0046] Implementation Method 1: Combination Figure 1 、 Figure 3 as well as Figure 5 This embodiment is described. The purpose of this embodiment is to provide a main mirror cone sleeve bonding optical axis positioning device, through which the three-point flexible joint end faces can be made coplanar, and at the same time, the flexible joint end face can be ensured to be parallel to the main mirror processing reference plane, the verticality of the main mirror optical axis and the back plate end face can be controlled, and the reference transfer of the optical axis can be realized.

[0047] The primary mirror cone sleeve bonding optical axis positioning device comprises a marble platform 1, a positioning tool 2, a curved surface positioning block 3, a flat surface positioning block 4, a primary mirror 5, a flexible cone sleeve assembly 6 and a primary mirror triangular back plate tool 8;

[0048] The positioning fixture 2 is a closed ring structure consisting of two straight lines and two semicircles, and a curved positioning block 3 is installed on each of the two semicircles, and a flat positioning block 4 is installed on any straight line;

[0049] The primary mirror 5 is used to be set in the positioning fixture 2 through the arc positioning block 3 and the plane positioning block 4;

[0050] The flexible cone sleeve assembly 6 is installed in the cone hole corresponding to the primary mirror 5;

[0051] The upper and lower end surfaces of the positioning fixture 2 are respectively provided with three bosses. The three bosses on the lower end surface are used to be placed on the marble platform 1, and the three bosses on the upper end surface are used to connect with the main mirror triangular back plate fixture 8;

[0052] There are 6 bosses on the primary mirror triangular back plate tooling 8, including 3 circular bosses and 3 rectangular bosses. The 3 circular bosses correspond to the positions of the tapered holes of the primary mirror 5, and the 3 rectangular bosses correspond to the positions of the 3 bosses on the upper end face of the positioning tooling 2.

[0053] The specific structure of the main mirror cone sleeve bonding optical axis positioning device proposed in this embodiment is as follows Figure 1 and Figure 5 As shown, the positioning device includes a marble platform 1, a positioning tool 2, a curved positioning block 3, a flat positioning block 4, a primary mirror 5, a flexible cone sleeve assembly 6, a cone sleeve bonding rod tool 7 and a primary mirror triangular back plate tool 8.

[0054] Among them, such as Figure 3As shown, the positioning tool 2 forms a combination with the arc surface positioning block 3 and the plane positioning block 4. The positioning tool 2 is a closed ring structure composed of two straight lines and two semicircles, and one arc surface positioning block 3 is installed on each of the two semicircles, and one plane positioning block 4 is installed on any straight line.

[0055] Furthermore, the upper and lower end faces of the positioning fixture 2 are respectively provided with three bosses, the three bosses on the lower end face are used to be placed on the marble platform 1, and the three bosses on the upper end face are used to be connected to the main mirror triangular back plate fixture 8.

[0056] The primary mirror 5 is arranged in the positioning fixture 2 through the arc surface positioning block 3 and the plane positioning block 4 to ensure that the outer circle of the primary mirror 5 cooperates with the arc surface positioning block 3 and the straight edge of the primary mirror 5 cooperates with the plane positioning block 4.

[0057] like Figure 5 As shown, the taper sleeve bonding rod fixture 7 is used to install the flexible taper sleeve assembly 6 in the corresponding tapered hole of the primary mirror 5. Specifically, the taper sleeve bonding rod fixture 7 and the flexible taper sleeve assembly 6 are connected and fixed with screws. Epoxy resin is injected around the outer circumference of the taper sleeve of the flexible taper sleeve assembly 6, and the taper sleeve is inserted into the corresponding tapered hole of the primary mirror. After installation, the taper sleeve is rotated clockwise to ensure an even adhesive layer. At the same time, the threaded hole of the flexible joint is rotated to approximately align with the theoretical design position. Repeat these steps to install the second and third sets of taper sleeve assemblies.

[0058] There are 6 bosses on the main mirror triangular back plate tooling 8, including 3 circular bosses and 3 rectangular bosses. The 3 circular bosses correspond to the positions of the tapered holes of the main mirror 5, and the 3 rectangular bosses correspond to the positions of the 3 bosses on the upper end face of the positioning tooling 2, so that the positioning tooling 2 is connected to the 3 rectangular bosses on the main mirror triangular back plate tooling through the 3 bosses on the upper end face.

[0059] This embodiment proposes a primary mirror cone sleeve bonding optical axis positioning device, comprising a primary mirror 5, a positioning fixture 2, a combination of a curved surface positioning block 3, and a flat surface positioning block 4, a flexible cone sleeve assembly 6, and a primary mirror triangular back plate fixture 8. The flexible cone sleeve assembly 6 is installed in the corresponding conical hole of the primary mirror 5. A plane is machined on the edge of the reflective surface of the primary mirror 5 so that the plane is parallel to the optical axis machining reference plane. Bosses are provided on the upper and lower end faces of the positioning fixture 2, respectively. The lower end face boss contacts a marble table, and the upper end face boss connects to the primary mirror triangular back plate fixture 8. The parallelism of the upper and lower end face bosses transfers the optical axis machining reference plane of the primary mirror 5 to the connection surface of the primary mirror triangular back plate fixture 8, thereby transferring the optical axis machining reference plane of the primary mirror 5 to the three-point flexible end face of the primary mirror.

[0060] Implementation method 2, see Figures 2 to 6This embodiment is to further specifically describe the optical axis positioning device for bonding the primary mirror cone sleeve proposed in the first embodiment above.

[0061] like Figure 2 As shown, the back of the primary mirror 5 is the machining reference plane, which is plane A. With plane A as the reference, the vertical deviation between the optical axis of the primary mirror 5 and plane A does not exceed 30". The edge of the reflective surface of the primary mirror 5 is chamfered without affecting the light aperture, and the parallelism of the chamfered plane B with plane A is within 0.01mm, so that the machining reference of the optical axis of the primary mirror 5 is transferred to plane B, and the optical axis is perpendicular to plane B.

[0062] like Figure 3 and Figure 4 As shown, positioning fixture 2 has three bosses machined on each of its upper and lower end faces. The three bosses on the upper end face are defined as plane C, which is coplanar and flat within 0.003mm. The three bosses on the lower end face are defined as plane D, which is flat within 0.003mm. With plane D as the reference, the parallelism between planes C and D is less than 0.01mm.

[0063] Furthermore, the positioning tooling 2, the arc surface positioning block 3 and the plane positioning block 4 form a combination, and the positioning surfaces of the arc surface positioning block 3 and the plane positioning block 4 are combined and processed so that the perpendicularity between the positioning surface and the plane D is within 0.01 mm, and the gap between the positioning surface and the outer circle of the main mirror 5 is 0.05 mm, so that the main mirror 5 can be accurately positioned.

[0064] like Figure 5 As shown, the cone sleeve bonding rod tooling 7 and the flexible cone sleeve assembly 6 are fixedly connected using screws.

[0065] like Figure 6 As shown, six bosses are machined on one side of the weight-reducing groove of the primary mirror triangular back plate fixture 8. Three of these circular bosses are coplanar, defined as Plane F, with a flatness within 0.003mm. Three other rectangular bosses are coplanar, defined as Plane E, with a flatness within 0.003mm. With Plane E as the reference, the parallelism between Plane E and Plane F is less than 0.01mm.

[0066] Implementation Method 3: Combination Figures 1 to 6 This embodiment describes a positioning method implemented by a primary mirror cone sleeve bonding optical axis positioning device based on the first or second embodiment described above. The method is as follows:

[0067] Step 1: Place the positioning tool on the marble platform, with the plane D of the lower end surface of the positioning tool in contact with the upper end surface of the marble platform;

[0068] Step 2: Install the primary mirror into the positioning fixture, and ensure that plane B of the primary mirror is in full contact with the marble surface;

[0069] Step 3: Fix the positioning fixture and the marble platform, and transfer the primary mirror optical axis reference plane to plane C of the positioning fixture;

[0070] Step 4: Use the cone sleeve bonding rod tooling to install the flexible cone sleeve assembly in the corresponding cone hole of the primary mirror;

[0071] Step 5: Fix the primary mirror triangular back plate fixture and the flexible cone sleeve assembly;

[0072] Step 6: Press down the primary mirror triangular back plate fixture until plane E is confirmed to be in full contact with plane C on the upper end face of the positioning fixture;

[0073] Step 7: The primary mirror optical axis reference plane is transferred to plane E;

[0074] Step 8: Plane E and plane F of the primary mirror back plate fixture are parallel, so that the optical axis reference plane is transferred to plane F. At the same time, plane F is in full contact with the end face of the three-point flexible cone sleeve assembly, completing the coplanarity of the end faces of the three-point flexible cone sleeve assembly.

[0075] Step 9: The plane H established by the end face of the three-point flexible cone sleeve assembly is parallel to the primary mirror processing reference plane A, completing the reference transfer perpendicular to the primary mirror optical axis and the plane established by the end face of the three-point flexible cone sleeve assembly.

[0076] In practical application, this embodiment Figure 2 As shown, plane A is the machining datum for the optical axis of primary mirror 5. Plane B is machined at the edge of the primary mirror 5's reflective surface, where it does not affect the aperture. Plane B must be parallel to datum plane A within 0.01 mm, and its flatness must be within 0.01 mm. Furthermore, the optical axis machining datum is transferred to plane B, and the optical axis of primary mirror 5 is perpendicular to plane B.

[0077] like Figure 3 As shown, the upper end surface of the positioning fixture 2 is designed with three bosses. The plane defined by these three bosses is defined as Plane C, with a flatness within 0.003 mm. The curved positioning block 3 is connected to the positioning fixture 2 with screws. The flat positioning block 4 is also connected to the positioning fixture 2 with screws. The curved positioning block 3 and the flat positioning block 4 are made of polytetrafluoroethylene to prevent damage to the mirror body during assembly with the primary mirror 5.

[0078] like Figure 4 As shown, the lower end surface of positioning fixture 2 is designed with three bosses. The plane defined by these three bosses is defined as plane D, with a flatness within 0.003mm. Positioning fixture 2 uses plane D as a reference, with plane C parallel to plane D within 0.01mm. Geometric tolerances are guaranteed by machining.

[0079] Furthermore, the positioning tooling 2, the arc surface positioning block 3 and the plane positioning block 4 form a combination, and the positioning surfaces of the arc surface positioning block 3 and the plane positioning block 4 are combined and processed. The perpendicularity of the positioning surface to the plane D is within 0.01 mm, and the gap between the positioning surface and the outer circle of the main mirror 5 is 0.05 mm, so that the main mirror 5 can be accurately positioned.

[0080] like Figure 5 As shown, use alcohol cotton to clean the upper end surface of the marble platform 1. Furthermore, place the positioning fixture 2 horizontally on the marble platform 1, with the plane D of the positioning fixture 2 in contact with the upper end surface of the marble platform 1. Furthermore, install the primary mirror 5 into the positioning fixture 2, ensuring that the outer circle of the primary mirror 5 matches the curved positioning block 3, and the straight edge of the primary mirror 5 matches the flat positioning block 4. The plane B of the primary mirror 5 is in full contact with the surface of the marble platform 1. Ensure that the plane D of the positioning fixture 2 is coplanar with the chamfered corner B of the primary mirror 5.

[0081] Furthermore, hot melt adhesive is applied to the outer circumferential edge of the positioning tool 2 to fix the positioning tool 2 and the marble platform 1 .

[0082] Furthermore, the optical axis reference plane of the primary mirror 5 is transferred to the plane C of the positioning fixture 2 .

[0083] Furthermore, the cone sleeve bonding rod fixture 7 and the flexible cone sleeve assembly 6 are screwed together. Epoxy resin is injected around the outer periphery of the cone sleeve in the flexible cone sleeve assembly, and the cone sleeve is inserted into the corresponding conical hole of the primary mirror 5. After installation, rotate the cone sleeve clockwise to ensure a uniform adhesive layer. Simultaneously, rotate the threaded hole of the flexible joint to approximately match the theoretical design position. Repeat the above steps to install the second and third sets of cone sleeves. Simultaneously, use a height gauge to check the height difference of the three components to ensure that the height difference of the three flexible cone sleeve assemblies is within 0.01 mm.

[0084] Furthermore, the cone sleeve bonding rod tooling 7 is removed.

[0085] Furthermore, the primary mirror triangular back plate tooling 8 is processed to have the same hole positions as the original triangular back plate.

[0086] like Figure 1 As shown, further, the primary mirror triangle back plate tooling 8 and the flexible cone sleeve assembly 6 are trial-assembled to check the correspondence between the flexible joint threaded hole and the primary mirror triangle back plate tooling optical hole. At this time, the glue has not yet cured (the glue takes 24 hours to cure), and the cone sleeve and the primary mirror hole can still move relative to each other. If the position of the flexible joint threaded hole and the primary mirror back plate tooling optical hole deviates, the position of the flexible joint assembly threaded hole is adjusted in time until the two hole positions are completely matched. The primary back plate tooling 8 and the flexible cone sleeve assembly are screwed together and fixed.

[0087] Furthermore, the primary mirror triangular back plate fixture 8 is pressed down until it is confirmed that the plane E is in full contact with the upper end surface C of the positioning fixture 2, and then fixed with screws.

[0088] Furthermore, the optical axis reference of the primary mirror 5 is transferred to the plane E.

[0089] like Figure 6 As shown, plane E of the primary mirror triangular back plate tooling 8 is parallel to plane F, further transferring the optical axis reference of the primary mirror 5 to plane F.

[0090] Furthermore, the plane F is in full contact with the end surface of the three-point flexible cone sleeve assembly 6 , thereby achieving the coplanarity of the end surfaces of the three-point flexible cone sleeve assembly 6 .

[0091] Furthermore, the plane H established by the end face of the three-point flexible cone sleeve assembly 6 is parallel to the back processing reference plane A of the primary mirror 5, and the reference transfer perpendicular to the plane established by the end face of the three-point flexible joint is achieved.

[0092] In the above description, it should be understood that when used in this specification and the appended claims, the term "comprising" indicates the presence of the described features, wholes, steps, operations, elements and / or components, but does not exclude the presence or addition of one or more other features, wholes, steps, operations, elements, components and / or their collections.

[0093] The foregoing description is merely an embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention are intended to be within the scope of the claims.

Claims

1. A primary mirror cone sleeve bonding optical axis positioning device, characterized in that: It comprises a marble platform (1), a positioning tool (2), a curved surface positioning block (3), a flat surface positioning block (4), a primary mirror (5), a flexible cone sleeve assembly (6) and a primary mirror triangular back plate tool (8); The positioning fixture (2) is a closed ring structure consisting of two straight lines and two semicircles, and a curved positioning block (3) is installed on each of the two semicircles, and a flat positioning block (4) is installed on any straight line; The positioning fixture (2) forms a combination with the arc surface positioning block (3) and the plane positioning block (4), wherein the verticality between the positioning surface of the combination and the plane D is within 0.01 mm, and the clearance between the positioning surface and the outer circle of the primary mirror (5) is 0.05 mm; The back of the primary mirror (5) is a processing reference plane, which is plane A, and with plane A as the reference, the vertical deviation between the optical axis of the primary mirror (5) and plane A does not exceed 30", and the edge of the reflecting surface of the primary mirror (5) is chamfered without affecting the light aperture, and the parallelism of the chamfered plane B and plane A is within 0.01mm; The primary mirror (5) is used to be arranged in the positioning fixture (2) through the arc surface positioning block (3) and the plane positioning block (4); The flexible cone sleeve assembly (6) is installed in the cone hole corresponding to the primary mirror (5); The upper and lower end faces of the positioning fixture (2) are respectively provided with three bosses. The three bosses on the upper end face of the positioning fixture (2) are coplanar, forming a plane C, and the flatness is within 0.003 mm; the three bosses on the lower end face are coplanar, forming a plane D, and the flatness is within 0.003 mm. With plane D as a reference, the parallelism between plane C and plane D is less than 0.01 mm. The three bosses on the lower end face are used to be placed on the marble platform (1), and the three bosses on the upper end face are used to be connected to the primary mirror triangular back plate fixture (8); The primary mirror triangular back plate fixture (8) is provided with 6 bosses, which are 3 circular bosses and 3 rectangular bosses. The 3 circular bosses correspond to the positions of the cone holes of the primary mirror (5), and the 3 rectangular bosses correspond to the positions of the 3 bosses on the upper end face of the positioning fixture (2). The three circular bosses are coplanar, namely plane F, with a flatness within 0.003 mm; the three rectangular bosses are coplanar, namely plane E, with a flatness within 0.003 mm; with plane E as the reference, the parallelism between plane E and plane F is less than 0.01 mm.

2. The primary mirror cone sleeve bonding optical axis positioning device according to claim 1, characterized in that: The outer circle of the main mirror (5) matches the arc surface positioning block (3), and the straight edge of the main mirror (5) matches the plane positioning block (4).

3. The primary mirror cone sleeve bonding optical axis positioning device according to claim 2, characterized in that: The materials of the arc surface positioning block (3) and the plane positioning block (4) are both polytetrafluoroethylene.

4. The primary mirror cone sleeve bonding optical axis positioning device according to claim 1, characterized in that: The device also includes a cone sleeve bonding rod tool (7); The cone sleeve bonding rod tooling (7) is used to install the flexible cone sleeve assembly (6) in the cone hole corresponding to the primary mirror (5).

5. A positioning method for a primary mirror cone sleeve bonding optical axis positioning device, characterized in that: The positioning device is a primary mirror cone sleeve bonding optical axis positioning device according to any one of claims 1 to 4, and the method is: Step 1: Place the positioning tool on the marble platform, with the plane D of the lower end surface of the positioning tool in contact with the upper end surface of the marble platform; Step 2: Install the primary mirror into the positioning fixture, and ensure that plane B of the primary mirror is in full contact with the marble surface; Step 3: Fix the positioning fixture and the marble platform, and transfer the primary mirror optical axis reference plane to plane C of the positioning fixture; Step 4: Use the cone sleeve bonding rod tooling to install the flexible cone sleeve assembly in the corresponding cone hole of the primary mirror; Step 5: Fix the primary mirror triangular back plate fixture and the flexible cone sleeve assembly; Step 6: Press down the primary mirror triangular back plate fixture until plane E is confirmed to be in full contact with plane C on the upper end face of the positioning fixture; Step 7: The primary mirror optical axis reference plane is transferred to plane E; Step 8: Plane E and plane F of the primary mirror back plate fixture are parallel, so that the optical axis reference plane is transferred to plane F. At the same time, plane F is in full contact with the end face of the three-point flexible cone sleeve assembly, completing the coplanarity of the end faces of the three-point flexible cone sleeve assembly. Step 9: The plane H established by the end face of the three-point flexible cone sleeve assembly is parallel to the primary mirror processing reference plane A, completing the reference transfer perpendicular to the primary mirror optical axis and the plane established by the end face of the three-point flexible cone sleeve assembly.

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