Collimator

Abstract

The utility model discloses a collimator which comprises a primary lens assembly, a secondary lens assembly, a right lens barrel, supporting legs, a shape-preserving support and a left lens barrel. The primary mirror assembly is arranged at one end of the right lens cone, the other end of the right lens cone is connected with one end of the left lens cone in a buckling manner and is fixed through a plurality of locking pieces, the secondary mirror assembly is arranged at the other end of the left lens cone, the primary mirror assembly is used for realizing light incidence, and the secondary mirror assembly is used for realizing light emergence; conformal supports are arranged on the periphery of the right lens cone and the periphery of the left lens cone in a surrounding mode, and height-adjustable supporting legs are symmetrically arranged on the two sides of the bottom of each conformal support so that the pitching angle of the collimator can be adjusted. The parallel light tube has the characteristics of compact structure, convenience in installation and adjustment, high stability, strong environmental practicability and the like, and overcomes the limitation that the existing parallel light tube is high in installation and adjustment difficulty and high in manufacturing cost.

Description

Technical Field

[0001] The utility model relates to the technical field of optical instruments, and particularly relates to a collimator. Background Art

[0002] A collimator is composed of components such as a lens barrel, primary and secondary mirror objective lens groups, etc. It is mainly an optical instrument used to generate parallel light beams and is used for the optical axis alignment and performance testing of an optical system. The collimator has the advantages of a large measurement aperture, a wide spectral range, a wide working temperature range, and strong environmental adaptability. It is a special instrument for the multi-optical axis alignment of spaceborne / ground laser communication systems and optical instruments, and can mainly be used for the optical axis parallelism alignment and performance testing between the laser optical axis, the television optical axis, and the visual optical axis. With other accessories equipped, other parameters of the optical system can also be measured.

[0003] Existing collimators mostly use optical glass materials. Optical glass is widely used due to its high material hardness and good stability. As the lenses of a Cassegrain collimator, both the primary and secondary mirrors need to be processed into aspherical surfaces. The optical processing process needs to go through process links such as material forming, spherical opening, rough polishing, fine polishing, and coating, and the manufacturing process is relatively cumbersome. For a collimator designed with optical glass, the primary mirror and the Invar back structure need to be adjusted and qualified first, and the secondary mirror and the three brackets need to be adjusted and qualified before the primary and secondary mirrors can be jointly adjusted. Moreover, due to the brittle material characteristics of optical glass, it is impossible to process a precision fitting structure, resulting in difficulty in determining the debugging accuracy and increasing the debugging time. In addition, most collimators designed with optical glass are used in a laboratory environment. If they need to adapt to the outdoor environment, an athermalization design needs to be done with Invar materials. However, after using Invar as the back structure, its stability is not suitable for field use and transportation. To sum up, optical glass has problems such as difficult aspherical processing, the need for expensive Invar materials as a temperature compensation structure for athermalization, high density, and high material costs. Summary of the Utility Model

[0004] The technical problem to be solved by the utility model is to provide a collimator with a compact structure, convenient assembly and adjustment, low manufacturing cost, and good environmental adaptability in view of the deficiencies of existing collimators.

[0005] To solve the above technical problem, the technical solution adopted by the utility model is as follows:

[0006] A collimator, comprising: a primary mirror assembly, a secondary mirror assembly, a right lens barrel, support feet, a conformal bracket, and a left lens barrel; the primary mirror assembly is disposed at one end of the right lens barrel, the other end of the right lens barrel is snap-connected to one end of the left lens barrel and fixed by a plurality of locking members, and the secondary mirror assembly is disposed at the other end of the left lens barrel. The primary mirror assembly is used to achieve light incidence, and the secondary mirror assembly is used to achieve light emission; conformal brackets are disposed around the outer periphery of the right lens barrel and the outer periphery of the left lens barrel, and support feet with adjustable heights are symmetrically provided on both sides of the bottom of the conformal bracket to achieve the pitch angle adjustment of the collimator.

[0007] As a further improvement of the present utility model, a primary mirror observation hole is provided on the side wall of the right lens barrel, and a secondary mirror observation hole is provided on the side wall of the left lens barrel.

[0008] As a further improvement of the present utility model, observation hole covers are provided on both the primary mirror observation hole and the secondary mirror observation hole, and the observation hole covers are connected to the right lens barrel and the left lens barrel through wing nuts.

[0009] As a further improvement of the present utility model, the end of the right lens barrel and the end of the left lens barrel are snap-connected through a concave-convex structure and locked and fixed by a plurality of first connecting bolts.

[0010] As a further improvement of the present utility model, the conformal bracket includes an upper bracket and a lower bracket. The upper bracket surrounds the upper parts of the right lens barrel and the left lens barrel, and the lower bracket surrounds the lower parts of the right lens barrel and the left lens barrel. The upper bracket and the lower bracket are locked and fixed through second connecting bolts; support feet with adjustable heights are symmetrically provided on both sides of the bottom of the lower bracket.

[0011] As a further improvement of the present utility model, the primary mirror assembly includes: a primary mirror, a rear cover, and a fine adjustment device; the rear cover is disposed at the end of the right lens barrel, the primary mirror is installed inside the rear cover, and a fine adjustment device is provided on the outer cylindrical surface of the rear cover to adjust the incident light beam.

[0012] As a further improvement of the present utility model, the fine adjustment device includes a moving threaded barrel, a moving ring, and a threaded pin; the moving threaded barrel and the moving ring are assembled and then screwed into the outer cylindrical surface of the rear cover, and the threaded pin is screwed into the side part of the outer cylindrical surface to form the fine adjustment device.

[0013] As a further improvement of the present utility model, the secondary mirror assembly includes a secondary mirror and a secondary mirror frame; the secondary mirror frame is disposed at the end of the left lens barrel, and the middle of the secondary mirror frame is recessed for installing the secondary mirror; the secondary mirror is coaxially disposed with the primary mirror, and the reflecting surfaces of the primary mirror and the secondary mirror are oppositely disposed.

[0014] As a further improvement of the present utility model, the primary mirror, the secondary mirror, the secondary mirror frame, the right lens barrel, and the left lens barrel are all made of aluminum alloy materials.

[0015] As a further improvement of the present utility model, the reflecting surfaces of the main mirror and the secondary mirror are both aspherical surfaces, and the optical surface accuracy of the aspherical surface is PV better than 1 / 8λ, and RMS better than 0.02λ@632.8nm.

[0016] Compared with the prior art, the advantages of the present utility model are as follows:

[0017] For the collimator of the present utility model, by buckling and connecting one end of the right barrel with one end of the left barrel and fixing them with a plurality of locking parts, a detachable barrel structure is formed, which is beneficial to reducing the assembly difficulty of the barrel. The main mirror assembly is arranged at the other end of the right barrel, and the secondary mirror assembly is arranged at the other end of the left barrel. The main mirror assembly is used to realize the incident of light, and the secondary mirror assembly is used to realize the outgoing of light. Connecting the main mirror assembly to the beam analyzer realizes the acquisition of parallel light beams. At the same time, conformal brackets are arranged around the outer periphery of the right barrel and the outer periphery of the left barrel, and the conformal brackets are used to support and fix the barrel structure in a circular shape to ensure the reliable stability of the entire collimator. Further, by symmetrically arranging adjustable-height support feet on both sides of the bottom of the conformal bracket and adjusting the height of the support feet, the pitch and yaw angles of the collimator can be quickly adjusted to reach the preset values, simplifying the debugging process of the collimator, and having the advantages of large measurement aperture, wide spectral range, wide working temperature range, and strong environmental adaptability. Description of the Drawings

[0018] Figure 1 It is a schematic cross-sectional structure principle diagram of the collimator in a specific embodiment of the present utility model;

[0019] Figure 2 It is a schematic three-dimensional structure principle diagram of the collimator with the rear cover removed in a specific embodiment of the present utility model;

[0020] Legend: 1. Main mirror; 2. Rear cover; 3. Moving screw barrel; 4. Moving ring; 5. Threaded pin; 6. Main mirror observation hole; 7. Right barrel; 8. Support foot; 9. First connecting bolt; 10. Conformal bracket; 101. Upper bracket; 102. Lower bracket; 11. Fixed bolt; 12. Secondary mirror observation hole; 13. Secondary mirror; 14. Secondary mirror frame; 15. Left barrel; 16. Observation hole cover; 17. Wing nut; 18. Second connecting bolt. Specific Embodiments

[0021] The following further describes the present utility model in conjunction with the accompanying drawings of the specification and specific preferred embodiments, but does not limit the protection scope of the present utility model thereby.

[0022] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by terms such as "side", "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model 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. Therefore, it should not be construed as a limitation to the present utility model.

[0023] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present utility model, the meaning of "a plurality" is two or more unless otherwise specifically defined.

[0024] Embodiment

[0025] As Figure 1 and Figure 2 As shown, the collimator of the present utility model includes: a primary mirror assembly, a secondary mirror assembly, a right lens barrel 7, support feet 8, a conformal bracket 10, and a left lens barrel 15. The primary mirror assembly is disposed at one end of the right lens barrel 7. The other end of the right lens barrel 7 is snap-connected to one end of the left lens barrel 15 and fixed by a plurality of locking members. The secondary mirror assembly is disposed at the other end of the left lens barrel 15. The primary mirror assembly is used to achieve the incidence of light, and the secondary mirror assembly is used to achieve the emergence of light. Conformal brackets 10 are disposed around the outer peripheries of both the right lens barrel 7 and the left lens barrel 15. Support feet 8 with adjustable heights are symmetrically provided on both sides of the bottom of the conformal bracket 10 to achieve the adjustment of the pitch angle of the collimator.

[0026] In this embodiment, one end of the right lens barrel 7 is buckled and connected to one end of the left lens barrel 15 and fixed by a plurality of locking members, forming a detachable lens barrel structure, which is beneficial to reducing the assembly difficulty of the lens barrel. The main mirror assembly is arranged at the other end of the right lens barrel 7, and the secondary mirror assembly is arranged at the other end of the left lens barrel 15. The main mirror assembly is used to realize the incident of light, and the secondary mirror assembly is used to realize the exit of light. Connecting the main mirror assembly to the beam instrument realizes the acquisition of parallel light beams. At the same time, conformal brackets 10 are arranged around the outer periphery of the right lens barrel 7 and the outer periphery of the left lens barrel 7. The conformal brackets 10 are used to annularly support and fix the lens barrel structure to ensure the reliable stability of the entire collimator, and it is also beneficial to set the outer shape of the lens barrel longer. Further, support feet 8 with adjustable heights are symmetrically arranged on both sides of the bottom of the conformal bracket 10. By adjusting the height of the support feet 8, the pitching and yaw angles of the collimator can be quickly adjusted to the preset values, simplifying the debugging process of the collimator.

[0027] As Figure 1 shown, a main mirror observation hole 6 is provided on the side wall of the right lens barrel 7, and a secondary mirror observation hole 12 is provided on the side wall of the left lens barrel 15. During the installation and adjustment process, it is convenient for the operator to use a color display card to align the light spot on the surfaces of the main mirror and the secondary mirror.

[0028] As Figure 2 shown, observation hole covers 16 are provided on both the main mirror observation hole 6 and the secondary mirror observation hole 12. The observation hole covers 16 are connected to the right lens barrel 7 and the left lens barrel 15 through wing nuts 17 to achieve the effects of protection and light shielding.

[0029] As Figure 1 shown, the end of the right lens barrel 7 and the end of the left lens barrel 15 are buckled and connected through a concave-convex structure and locked and fixed by a plurality of first connecting bolts 9.

[0030] As Figure 2 shown, the conformal bracket 10 includes a semi-circular upper bracket 101 and a semi-circular lower bracket 102. The upper bracket 101 surrounds the upper parts of the right lens barrel 7 and the left lens barrel 15, and the lower bracket 102 surrounds the lower parts of the right lens barrel 7 and the left lens barrel 15. The upper bracket 101 and the lower bracket 102 are locked and fixed through a second connecting bolt 18, that is, the conformal bracket 10 is supported around the outer peripheries of the right lens barrel 7 and the left lens barrel 15. Support feet 8 with adjustable heights are symmetrically arranged on both sides of the bottom of the lower bracket 102.

[0031] As Figure 1As shown in the figure, the main mirror assembly includes: a main mirror 1, a rear cover 2, and a fine-tuning device. The rear cover 2 is arranged at the end of the right lens barrel 7. The main mirror 1 is installed inside the rear cover 2. A fine-tuning device is provided on the outer cylinder of the rear cover 2. The beam instrument is connected to the fine-tuning device in the form of a special interface, and the beam can be adjusted according to actual needs, and then the corresponding parallel beam can be obtained, which is convenient and reliable. It can be known that a light-transmitting through hole is opened at the center of the main mirror 1, and a light incident port is opened at the center of the outer cylinder of the rear cover 2. The light-transmitting through hole and the light incident port are arranged opposite to each other.

[0032] Further, the fine-tuning device includes a moving threaded barrel 3, a moving ring 4, and a threaded pin 5. After the moving threaded barrel 3 and the moving ring 4 are assembled, they are screwed into the outer cylinder of the rear cover 2, and the threaded pin 5 is screwed into the side of the outer cylinder, that is, the fine-tuning device is formed. An internal thread is provided in the moving threaded barrel 3, and an external thread is provided on the outer cylinder of the rear cover 2. By screwing the moving threaded barrel 3 into or out of the outer cylinder of the rear cover 2, the function of fine-tuning the focal length of the main mirror 1 is achieved.

[0033] As Figure 1 shown in the figure, the secondary mirror assembly includes a secondary mirror 13 and a secondary mirror frame 14. The secondary mirror frame 14 is arranged at the end of the left lens barrel 15. The middle of the secondary mirror frame 14 is recessed for installing the secondary mirror 13. The secondary mirror 13 is coaxially arranged with the main mirror 1, and the reflecting surfaces of the main mirror 1 and the secondary mirror 13 are arranged opposite to each other.

[0034] In this embodiment, the main mirror 1, the secondary mirror 13, the secondary mirror frame 14, the right lens barrel 7, and the left lens barrel 15 are all made of aluminum alloy material. The aluminum alloy material has the characteristics of light weight, making the overall weight of the collimator relatively light and convenient to carry. The aluminum alloy lens can be processed by a single-point diamond lathe to obtain a mating reference with a micron-level or even sub-micron-level accuracy, greatly reducing the alignment time. Compared with the collimator made of optical glass, the alignment time is reduced by more than 50%. Since the main body structure of the collimator is made of the same material, it expands or contracts proportionally when the temperature changes, so no additional athermalization design is required. At the same time, there is no complex back structure design, which can meet the needs of the field and transportation.

[0035] Further, the main mirror 1 is used to guide the light to the required direction to ensure the parallelism of the light; the secondary mirror 13 is used to focus the target light source and the detection light source to reduce the scattering of the light. The reflecting surfaces of the main mirror 1 and the secondary mirror 13 are both aspherical surfaces, and the optical surface accuracy PV of the aspherical surface is better than 1 / 8λ, and the RMS is better than 0.02λ@632.8nm, where λ is the beam wavelength.

[0036] In this embodiment, the assembly process of the collimator includes the following steps:

[0037] Step 1: Screw the two sets of support feet 8 to the bottom of the lower bracket 102 respectively, with the screwing thread depth of about 1 / 2 of the total length, ensuring that the exposed length error of the support feet 8 at all four sides is ±0.5mm; later, the pitch and elevation viewing angles can be quickly obtained to the preset values by adjusting the screwing height of the bolts of the support feet 8.

[0038] Step 2: Use the first connecting bolt 9 to fix the left lens barrel 15 and the right lens barrel 7 into an integrated lens barrel; use a bolt torque meter during the tightening process, set the locking force to about 10KN, and tighten the bolts diagonally in sequence. The side walls of the left lens barrel 15 and the right lens barrel 7 are respectively provided with a secondary mirror observation hole 12 and a primary mirror observation hole 6. The primary mirror observation hole 6 and the secondary mirror observation hole 12 facilitate the operator to use the color card to align the light spot on the surface of the primary mirror 7 and the secondary mirror 15 during the entire installation process.

[0039] Step 3: Install the lens barrel assembled in step 2 onto the lower bracket 102, install the upper bracket 101, and lock and fix the upper bracket 101 and the lower bracket 102 through the second connecting bolt 18. The locking force is set to about 10KN to ensure that the lens barrel is reliably fixed.

[0040] Step 4: Fit the mounting surface of the secondary mirror frame 14 processed by single-point turning to the mounting surface of the left mirror barrel 15, and use the fixing bolts 11 to fix the secondary mirror frame 14 to the end of the left mirror barrel 15. Use a bolt torque meter during the tightening process, and set the locking force to about 10KN to ensure that the secondary mirror frame 14 is reliably fixed.

[0041] Step 5: Fit the mounting surface of the secondary mirror 13 processed by single-point turning to the middle mounting surface of the three-claw support of the secondary mirror frame 14, and fix them with hexagon socket screws. Use a bolt torque meter during the tightening process, and set the locking force to about 1.5KN to ensure that the secondary mirror 13 is reliably fixed.

[0042] Step 6: Fit the mounting surface of the main mirror 1 processed by single-point turning with the mounting surface of the right lens barrel 7, and use the hexagon socket screw to fix the main mirror 1 to one end of the right lens barrel 7. Use a bolt torque meter during the tightening process, and set the locking force to about 10KN to ensure that the main mirror 1 is reliably fixed.

[0043] Step 7: Use the hexagon socket screw to fix the rear cover 2 to the end of the right lens barrel 7, assemble the moving ring 4 and the moving threaded barrel 3 together and screw them into the rear cover 2, and screw the threaded pin 5 into the cylinder at the end of the rear cover 2 to form a fine-tuning device; the operator can change the focal length and the appropriate light beam by adjusting the fine-tuning device.

[0044] Step 8: Place the observation hole covers 16 on the left and right observation holes respectively, and use butterfly nuts 17 to fix the observation hole covers 16 to achieve protection and shading effects.

[0045] The above are only the preferred embodiments of the present utility model. The protection scope of the present utility model is not limited to the above embodiments. All technical solutions falling within the concept of the present utility model belong to the protection scope of the present utility model. It should be noted that for those of ordinary skill in the art, several improvements and refinements made without departing from the principle of the present utility model should also be regarded as within the protection scope of the present utility model.

Claims

1. A collimator, characterized in that, Including: A primary mirror assembly, a secondary mirror assembly, a right lens barrel (7), support feet (8), a conformal bracket (10), and a left lens barrel (15); the primary mirror assembly is arranged at one end of the right lens barrel (7), the other end of the right lens barrel (7) is buckled and connected to one end of the left lens barrel (15) and fixed by a plurality of locking members, a secondary mirror assembly is arranged at the other end of the left lens barrel (15), the primary mirror assembly is used to realize the incidence of light, and the secondary mirror assembly is used to realize the exit of light; the conformal bracket (10) is arranged around the outer periphery of the right lens barrel (7) and the outer periphery of the left lens barrel (15), and adjustable-height support feet (8) are symmetrically arranged on both sides of the bottom of the conformal bracket (10) to realize the pitch angle adjustment of the collimator.

2. The collimator according to claim 1, wherein A primary mirror observation hole (6) is arranged on the side wall of the right lens barrel (7), and a secondary mirror observation hole (12) is arranged on the side wall of the left lens barrel (15).

3. The collimator according to claim 2, characterized in that, Observation hole covers (16) are arranged on the primary mirror observation hole (6) and the secondary mirror observation hole (12), and the observation hole covers (16) are connected to the right lens barrel (7) and the left lens barrel (15) through wing nuts (17).

4. The collimator according to claim 2, characterized in that, The end of the right lens barrel (7) is buckled and connected to the end of the left lens barrel (15) through a concave-convex structure and locked and fixed by a plurality of first connecting bolts (9).

5. The collimator according to any one of claims 1 to 4, characterized in that The conformal bracket (10) includes an upper bracket (101) and a lower bracket (102), the upper bracket (101) surrounds the upper parts of the right lens barrel (7) and the left lens barrel (15), the lower bracket (102) surrounds the lower parts of the right lens barrel (7) and the left lens barrel (15), and the upper bracket (101) and the lower bracket (102) are locked and fixed through second connecting bolts (18); adjustable-height support feet (8) are symmetrically arranged on both sides of the bottom of the lower bracket (102).

6. The collimator according to any one of claims 1 to 4, characterized in that, The primary mirror assembly includes: a primary mirror (1), a rear cover (2), and a fine adjustment device; the rear cover (2) is arranged at the end of the right lens barrel (7), the primary mirror (1) is installed inside the rear cover (2), and a fine adjustment device is arranged on the outer cylindrical surface of the rear cover (2) to adjust the incident light beam.

7. The collimator according to claim 6, wherein, The fine adjustment device includes a moving threaded barrel (3), a moving ring (4), and a threaded pin (5); after the moving threaded barrel (3) and the moving ring (4) are assembled, they are screwed into the outer cylindrical surface of the rear cover (2), and the threaded pin (5) is screwed into the side part of the outer cylindrical surface to form the fine adjustment device.

8. The collimator according to claim 6, wherein The secondary mirror assembly includes a secondary mirror (13) and a secondary mirror frame (14); the secondary mirror frame (14) is arranged at the end of the left lens barrel (15), the middle of the secondary mirror frame (14) is recessed for installing the secondary mirror (13); the secondary mirror (13) is coaxially arranged with the primary mirror (1), and the reflecting surfaces of the primary mirror (1) and the secondary mirror (13) are arranged opposite to each other.

9. The collimator according to claim 8, characterized in that, The primary mirror (1), the secondary mirror (13), the secondary mirror frame (14), the right lens barrel (7), and the left lens barrel (15) are all made of aluminum alloy material.

10. The collimator according to claim 9, wherein, The reflecting surfaces of the primary mirror (1) and the secondary mirror (13) are both aspherical surfaces, and the optical surface form accuracy of the aspherical surface is PV better than 1 / 8λ, and RMS better than 0.02λ@632.8nm.

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