A high-precision reflector assembly and adjustment method

Abstract

The present invention relates to a high-precision reflector assembly and adjustment method, which belongs to the field of optical engineering. The method comprises the following steps: bonding the reflector to a reflector frame using an adhesive, and then mounting the reflector frame on a mounting seat using a mirror mount bracket; adjusting the reflector surface profile so that the reflector surface profile changes by less than 0.01λ, where λ=632.8nm; adjusting the autocollimator for self-alignment; and adjusting the mounting angle of the mirror mount bracket so that the autocollimator is aligned with the plane reflector, thereby completing the high-precision assembly and adjustment of the reflector. The present invention uses a wavefront testing device 7 to measure the reflector surface profile in real time, and uses a surface profile adjustment pad 5 to adjust the reflector surface profile online. The stress generated by the deformation of the mirror frame is offset by the stress generated by the adhesive, ensuring that the reflector surface profile change is less than 0.01λλ=632.8nm.

Description

Technical Field

[0001] The invention belongs to the field of optical engineering, and in particular relates to a high-precision reflector assembly and adjustment method. Background Art

[0002] At present, the reflector and the frame are fixed together by gluing. The assembly of the frame and the reflector is directly mounted on the mounting seat, and the angle requirements of the reflector are ensured by grinding the mounting surface of the frame.

[0003] Large-aperture mirrors have a large diameter-to-thickness ratio, and the materials used are prone to deformation. This is especially true for semi-transparent, semi-reflective mirrors made of zinc sulfide or zinc selenide. Adhesive bonding of the mirror to the frame can cause deformation during the curing process, generating stress and significant surface shape variation. This makes it difficult to maintain a surface shape variation of less than 0.01λ (λ = 632.8nm). Furthermore, mirrors have strict angle requirements. When adjusting the mirror angle, the frame deforms, generating stress that further affects the mirror's surface shape. Using traditional mirror assembly and adjustment methods, it is difficult to maintain a surface shape variation of less than 0.01λ (λ = 632.8nm) while also ensuring that the mirror angle meets the required requirements. Summary of the Invention

[0004] Technical issues to be solved:

[0005] To overcome the shortcomings of existing technologies, the present invention provides a high-precision reflector assembly and adjustment method that utilizes an autocollimator, specialized tooling, specialized adjustment pads, and wavefront testing equipment to achieve high-precision reflector assembly and adjustment. By designing specialized adjustment pads, the reflector's surface shape and angle can be adjusted online. Furthermore, the structure of the reflector components is optimized, and the original mounting base is replaced with a mirror base bracket and mounting base. This allows for adjustment of the reflector's angle without affecting the reflector's surface shape, thereby improving the reflector's surface shape accuracy and angular assembly accuracy.

[0006] The technical solution of the present invention is: a high-precision reflector installation method, characterized by the following specific steps:

[0007] Step 1: Use adhesive to bond the reflector to the reflector frame, and then install the reflector frame on the mounting base through the mirror base bracket;

[0008] Step 2: Adjust the reflector surface shape so that the reflector surface shape change is less than 0.01λ, λ=632.8nm;

[0009] Step 3: Adjust the autocollimator;

[0010] Step 4: Adjust the installation angle of the mirror mount bracket to align the autocollimator with the plane reflector to complete the high-precision installation of the reflector.

[0011] A further technical solution of the present invention is: the adjustment method of step 2 is to place the assembly of step 1 into the wavefront testing equipment and place the standard reflector in the reflection light path of the reflector; adjust the standard reflector and measure the surface shape of the reflector; and adjust the surface shape of the reflector to meet the requirements by installing surface adjustment pads of different thicknesses between the reflector frame and the mirror base bracket.

[0012] A further technical solution of the present invention is: in the adjustment method of step 3, the assembly in which the reflector surface shape adjustment is completed in step 2 is installed in the angle adjustment tool 8; and a reference plane reflector 10 and a plane reflector 11 are installed on the reference surface of the angle adjustment tool 8; an autocollimator is placed in front of the reference plane reflector 10, and the plane reflector 11 is located in the reflection light path of the reflector; and the angle of the autocollimator is adjusted so that the autocollimator is aligned with the reference plane reflector 10.

[0013] A further technical solution of the present invention is: in the adjustment method of step 4, the reference plane reflector is first removed, and the thickness of the angle adjustment pad installed between the mirror base bracket and the mounting seat is adjusted, and the mirror base bracket is twisted to complete the installation angle adjustment of the mirror base bracket.

[0014] A further technical solution of the present invention is that the mirror base bracket includes a hollow bottom plate and a bracket with a light-transmitting structure, and the bracket is coaxially fixed to the bottom plate; so that the light path can pass through the mirror base bracket to reach the reflecting surface of the reflector.

[0015] A further technical solution of the present invention is that: the upper and lower surfaces of the bottom plate are parallel; the bottom surface of the bracket is fixed parallel to the upper surface of the bottom plate, and the top surface thereof is an inclined surface, serving as a mounting surface for the reflector frame;

[0016] A further technical solution of the present invention is that the surface adjustment pad is a U-shaped pad installed between the reflector frame and the mirror base bracket, and its size is smaller than the installation surface size of the reflector frame; the surface adjustment pad includes a series of specifications of various thicknesses.

[0017] A further technical solution of the present invention is: the angle adjustment tooling is a frame structure, and an interface for installing a mounting seat is provided on one side wall thereof, so that the assembly installed therein and the plane reflector meet the reflector folding angle design, ensuring that the angle between the mounting surface of the reference plane reflector and the mounting surface of the plane reflector is equal to the angle at which the reflector folds the light.

[0018] A further technical solution of the present invention is that the angle adjustment pad is a series of pads with different angles; the angle of the angle adjustment pad can be adjusted by grinding the angle to meet the requirements.

[0019] Beneficial effects

[0020] The beneficial effects of the present invention are as follows: the present invention uses a wavefront testing device 7 to measure the surface shape of the reflector 1 in real time, and uses a surface shape adjustment pad 5 to adjust the surface shape of the reflector 1 online, and uses the stress generated by the deformation of the frame to offset the stress generated by the adhesive, thereby ensuring that the surface shape change of the reflector is less than 0.01λ, λ=632.8nm.

[0021] The mirror base bracket 3 of the present invention is used to connect the reflector base 2 and the mounting base 4. The angle requirement of the reflector is ensured by adjusting the angle between the mirror base bracket and the mounting base. This structure transfers the angle adjustment link to the end away from the reflector, reducing the influence of the stress generated by the deformation of the structural parts when adjusting the angle on the surface shape of the reflector, thereby ensuring that the surface shape change of the reflector is less than 0.01λ, λ=632.8nm, while also ensuring the angle of the reflector. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 Schematic diagram of reflector bonding;

[0023] Figure 2 Schematic diagram for online adjustment of reflective mirror surface type;

[0024] Figure 3 This is a schematic diagram of the installation of the reflector angle adjustment tooling;

[0025] Figure 4 Establish a reference diagram for online adjustment of the reflector angle;

[0026] Figure 5 Schematic diagram for online adjustment of the reflector angle;

[0027] Explanation of the accompanying reference numerals: 1. Reflector, 2. Reflector frame, 3. Mirror mount bracket, 4. Mounting seat, 5. Surface adjustment pad, 6. Standard reflector, 7. Wavefront testing equipment, 8. Angle adjustment tooling, 9. Autocollimator, 10. Reference plane reflector, 11. Plane reflector, 12. Angle adjustment pad. DETAILED DESCRIPTION

[0028] The embodiments described below with reference to the accompanying drawings are exemplary and are intended to explain the present invention, but should not be construed as limiting the present invention.

[0029] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0030] The adjustment equipment used in the high-precision reflector adjustment method of this embodiment includes a reflector 1, a reflector frame 2, a mirror base bracket 3, a mounting base 4, a surface adjustment pad 5, a standard reflector 6, a wavefront testing device 7, an angle adjustment tool 8, an autocollimator 9, a reference plane reflector 10, a plane reflector 11, and an angle adjustment pad 12.

[0031] The specific operation steps of this embodiment are as follows:

[0032] 1) If Figure 1 As shown, a simulation tool is used to calculate the bonding position and the amount of adhesive, and the reflector 1 is bonded to the reflector frame 2 with the adhesive.

[0033] 2) If Figure 2 As shown, the reflector frame 2 equipped with the reflector 1 is mounted on the mirror base bracket 3, then mounted on the mounting base 4, and placed on the wavefront testing device 7; the standard reflector 6 is adjusted to measure the surface shape of the reflector 1; by installing surface shape adjustment pads 5 of different thicknesses between the reflector frame 2 and the mirror base bracket 3, and grinding the thickness of the surface shape adjustment pads 5 when necessary, the stress generated by the deformation of the mirror frame and the stress generated by the adhesive are offset, ensuring that the surface shape change of the reflector 1 is less than 0.01λ, where λ=632.8nm;

[0034] The mirror base bracket 3 is a light-transmitting structure in the middle, which is used to connect the reflector base 2 and the mounting base 4. It can rotate around the Z axis and the Y axis, that is, the mirror base bracket 3 can rotate and tilt relative to the mounting base 4.

[0035] 3) If Figure 3 As shown, the assembly of the reflector 1, the reflector frame 2, the mirror base bracket 3, the mounting base 4, and the surface adjustment pad 5 is installed on the angle adjustment fixture 8;

[0036] 4) If Figure 4 As shown, the reference plane reflector 10 and the plane reflector 11 are mounted on the reference surface of the angle adjustment fixture 8; the angle adjustment fixture 8 is then placed in front of the autocollimator 9, and the angle of the autocollimator 9 is adjusted so that the autocollimator 9 is aligned with the reference plane reflector 10;

[0037] The angle adjustment tooling 8 is designed according to the interface of the mounting base 4 and the deflection angle of the reflector. The tooling 8 needs to be able to install the assembly of the reflector 1, the reflector frame 2, the mirror base bracket 3, the mounting base 4, the surface adjustment pad 5 and the angle adjustment pad 12, and ensure that the angle between the mounting surface of the reference plane reflector 10 and the mounting surface of the plane reflector 11 is equal to the angle at which the reflector deflects the light.

[0038] 5) If Figure 5 As shown, remove the reference plane reflector 10, select a suitable angle adjustment pad 12, grind the thickness of the angle adjustment pad 12 if necessary, and twist the mirror base bracket 3 to align the autocollimator with the plane reflector 11, thereby completing the high-precision adjustment of the reflector.

[0039] Preferably, in order to ensure stability, a special surface adjustment pad 5 and an angle adjustment pad 12 are designed. The surface adjustment pad 5 can be but is not limited to a "U"-shaped gasket, which is slightly smaller than the mounting surface size of the reflector frame and includes various thickness specifications; the angle adjustment pad 12 is a series of gaskets with different angles. If necessary, the angle of the adjustment pad can be sharpened to ensure that the angle meets the requirements.

[0040] Although the embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and are not to be construed as limitations on the present invention. A person skilled in the art may change, modify, replace and modify the above embodiments within the scope of the present invention without departing from the principles and purpose of the present invention.

Claims

1. A high-precision reflector assembly method, characterized in that The specific steps are as follows: Step 1: Use adhesive to bond the reflector to the reflector frame, and then install the reflector frame on the mounting base through the mirror base bracket; Step 2: Adjust the reflector surface shape so that the reflector surface shape changes by less than 0.01λ, where λ = 632.8nm. The adjustment method is to place the assembly from step 1 into the wavefront test equipment and place the standard reflector in the reflective light path of the reflector; adjust the standard reflector and measure the reflector surface shape; and adjust the reflector surface shape to meet the requirements by installing surface adjustment pads of different thicknesses between the reflector frame and the mirror mount bracket. Step 3: Adjust the autocollimator self-alignment; the adjustment method is to install the assembly in which the reflector surface shape adjustment is completed in step 2 into the angle adjustment tool (8); and install the reference plane reflector (10) and the plane reflector (11) on the reference surface of the angle adjustment tool 8; place the autocollimator in front of the reference plane reflector (10), and the plane reflector (11) is located in the reflection light path of the reflector; adjust the angle of the autocollimator so that the autocollimator is aligned with the reference plane reflector (10); Step 4: Adjust the installation angle of the mirror base bracket to align the autocollimator with the plane reflector and complete the high-precision installation of the reflector. The adjustment method is to first remove the reference plane reflector, adjust the thickness of the angle adjustment pad installed between the mirror base bracket and the mounting seat, and twist the mirror base bracket to complete the installation angle adjustment of the mirror base bracket.

2. The high-precision reflector assembly and adjustment method according to claim 1, characterized in that: The mirror base bracket includes a hollow base plate and a bracket with a light-transmitting structure, and the bracket is coaxially fixed to the base plate, so that the light path can pass through the mirror base bracket to reach the reflecting surface of the reflector.

3. The high-precision reflector assembly and adjustment method according to claim 2, characterized in that: The upper and lower surfaces of the bottom plate are parallel; the bottom surface of the bracket is fixed parallel to the upper surface of the bottom plate, and the top surface is an inclined surface, which serves as the mounting surface of the reflector frame.

4. The high-precision reflector assembly and adjustment method according to claim 1, characterized in that: The surface adjustment pad is a U-shaped pad installed between the reflector frame and the mirror base bracket, and its size is smaller than the installation surface size of the reflector frame; the surface adjustment pad includes a series of specifications of various thicknesses.

5. The high-precision reflector assembly and adjustment method according to claim 1, characterized in that: The angle adjustment tooling is a frame structure, and an interface for installing a mounting seat is provided on one side wall thereof, so that the assembly installed therein and the plane reflector meet the reflector deflection angle design, ensuring that the angle between the mounting surface of the reference plane reflector and the mounting surface of the plane reflector is equal to the angle at which the reflector deflects the light.

6. The high-precision reflector assembly and adjustment method according to claim 1, characterized in that: The angle adjustment pads are a series of pads with different angles; the angles of the angle adjustment pads can be adjusted to meet the requirements.

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