Electromotive variable magnification laser beam expander mechanism for use in a spectrometer
By designing an electrically operated variable-magnification laser beam expander mechanism in the spectrometer and using a drive component to adjust the lens position to achieve continuous zooming, the problem of repeated disassembly and reassembly of the beam expander in the prior art is solved, thus improving the detection accuracy of the spectrometer.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- 奥谱天成(湖南)信息科技有限公司
- Filing Date
- 2025-07-23
- Publication Date
- 2026-06-30
AI Technical Summary
The beam expanders in existing spectrometers require repeated disassembly, assembly, and calibration, making the magnification process cumbersome and affecting detection accuracy.
Design an electric zoom laser beam expander mechanism. By sequentially setting lenses along the optical axis and adjusting the lens positions using a drive assembly, continuous zoom can be achieved, avoiding the need to disassemble and reassemble the beam expander.
It achieves autonomous magnification control, eliminating the need to disassemble and reassemble the beam expander, thus improving the detection accuracy and speed of the spectrometer.
Smart Images
Figure CN224436670U_ABST
Abstract
Description
Technical Field
[0001] This disclosure relates to the field of spectroscopic instrument technology, and in particular to an electrically operated variable magnification laser beam expander mechanism for use in a spectrometer. Background Technology
[0002] The requirements for laser beam energy, collimation, and other specifications vary depending on the application scenario. For laser processing, only by adjusting the beam expander to collimate the laser beam can a small, high-power-density spot be obtained using a focusing lens. However, most beam expanders currently in use achieve zoom by adjusting the lens position manually or at a fixed point. Such lenses require repeated disassembly and recalibration of the optical axis consistency during zooming, making the zooming process cumbersome.
[0003] To address the above issues, an electrically operated variable magnification laser beam expander mechanism for use in spectrometers was designed. Utility Model Content
[0004] The purpose of this disclosure is to overcome the shortcomings of the prior art and provide an electric variable magnification laser beam expander mechanism for a spectrometer, which enables autonomous control of magnification according to needs, eliminates the need to disassemble and reassemble the beam expander during the magnification process, and avoids repeated adjustments to the detection optical path.
[0005] To achieve the aforementioned objectives of this utility model, the present disclosure adopts the following technical solution:
[0006] An electrically operated variable magnification laser beam expander mechanism for use in a spectrometer, the beam expander mechanism comprising a lens assembly and a drive assembly;
[0007] The lens assembly includes a first lens, a second lens, a third lens, and a fourth lens arranged sequentially along the optical axis.
[0008] The first lens and the fourth lens are fixedly disposed, and the driving assembly is used to drive the second lens and the third lens to move linearly along the optical axis to achieve continuous zoom.
[0009] In one exemplary embodiment of this disclosure, the first lens and the fourth lens have positive optical power, and the second lens and the third lens have negative optical power.
[0010] In one exemplary embodiment of this disclosure, the beam expander mechanism further includes:
[0011] The base is configured to extend along the optical axis.
[0012] A guide rail is provided at the top of the base. The guide rail extends along the optical axis. A first slider and a second slider are slidably mounted on the guide rail along the optical axis.
[0013] The second lens is mounted on the first slider, and the third lens is mounted on the second slider;
[0014] The driving component can drive the first slider and the second slider to move on the guide rail, so that the second lens and the third lens move linearly along the optical axis.
[0015] In one exemplary embodiment of this disclosure, the first lens is disposed on a first mounting base, the second lens is disposed on a second mounting base, the third lens is disposed on a third mounting base, and the fourth lens is disposed on a fourth mounting base;
[0016] The first mounting base and the fourth mounting base are respectively disposed on the top two sides of the base, the second mounting base is mounted on the first slider, and the third mounting base is mounted on the second slider.
[0017] In one exemplary embodiment of this disclosure, mounting plates are respectively provided on the bottom ends of both sides of the base, and the drive assembly is mounted on the mounting plates.
[0018] In one exemplary embodiment of this disclosure, the driving component includes:
[0019] Two drive motors are mounted on one of the mounting plates;
[0020] A screw is connected to the output end of the drive motor, and the other end of the screw is rotatably connected to another mounting plate;
[0021] A movable block is threaded onto the screw, and a guide rod is mounted on the movable block;
[0022] One of the two guide rods is connected to the first slider, and the other of the two guide rods is connected to the second slider.
[0023] In one exemplary embodiment of this disclosure, a first guide groove extending along the optical axis is provided on one side wall of the base, and a second guide groove extending along the optical axis is provided on the other side wall of the base;
[0024] One of the two guide rods passes through the first guide groove or the second guide groove and is connected to the first slider, while the other of the two guide rods passes through the second guide groove or the first guide groove and is connected to the second slider.
[0025] In one exemplary embodiment of this disclosure, the first guide groove and the second guide groove have different dimensions.
[0026] In one exemplary embodiment of this disclosure, a limiting plate is provided at the bottom of the mounting plate, and photoelectric switches are respectively provided on both sides of the limiting plate. Induction plates corresponding to the photoelectric switches on the same side are respectively provided on the two moving blocks.
[0027] In one exemplary embodiment of this disclosure, the first lens, the second lens, the third lens, and the fourth lens are all spherical lenses.
[0028] The beneficial effects of this disclosure are:
[0029] This disclosure provides an electrically operated variable magnification laser beam expander mechanism for a spectrometer. By sequentially arranging a first lens, a second lens, a third lens, and a fourth lens along the optical axis, and fixing the first and fourth lenses, the positions of the second and third lenses are adjusted by a drive assembly. This allows for autonomous control of the magnification as needed, and the beam expander does not need to be disassembled during the magnification process, avoiding repeated adjustments to the detection optical path and improving the detection accuracy of the spectrometer. Attached Figure Description
[0030] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this disclosure and, together with the description, serve to explain the principles of this disclosure. It is obvious that the drawings described below are merely some embodiments of this disclosure, and those skilled in the art can obtain other drawings based on these drawings without any inventive effort.
[0031] Figure 1 This is a schematic diagram of the structure of an electrically operated variable magnification laser beam expander mechanism used in a spectrometer according to one embodiment of the present disclosure;
[0032] Figure 2 This is a cross-sectional view of an electrically operated variable magnification laser beam expander mechanism for a spectrometer in one embodiment of the present disclosure;
[0033] Figure 3 This is a top view of an electrically operated zoom laser beam expander mechanism for a spectrometer in one embodiment of the present disclosure;
[0034] Figure 4 This is a schematic diagram of the structure of the base in one embodiment of the present disclosure;
[0035] Figure 5 This is a schematic diagram of the structure of the limiting plate in one embodiment of the present disclosure;
[0036] Figure 6 This is a diagram of a focal-free zoom beam expander optical path system in one embodiment of the present disclosure.
[0037] Explanation of reference numerals in the attached figures:
[0038] 1. First lens; 2. Second lens; 3. Third lens; 4. Fourth lens; 5. Base; 6. Guide rail; 7. First slider; 8. Second slider; 9. First mounting base; 10. Second mounting base; 11. Third mounting base; 12. Fourth mounting base; 13. Mounting plate; 14. Drive motor; 15. Screw; 16. Moving block; 17. Guide rod; 18. First guide groove; 19. Second guide groove; 20. Limiting plate; 21. Photoelectric switch; 22. Sensing plate. Detailed Implementation
[0039] Exemplary embodiments will now be described more fully with reference to the accompanying drawings. However, these exemplary embodiments can be implemented in many forms and should not be construed as limited to the embodiments set forth herein; rather, they are provided so that this disclosure will be thorough and complete, and will fully convey the concept of the exemplary embodiments to those skilled in the art. The same reference numerals in the drawings denote the same or similar structures, and therefore detailed descriptions of them will be omitted. Furthermore, the drawings are merely illustrative of this disclosure and are not necessarily drawn to scale.
[0040] Although relative terms such as "up" and "down" are used in this specification to describe the relative relationship of one component of an icon to another, these terms are used only for convenience, such as according to the orientation of the examples shown in the accompanying drawings. It is understood that if the device of the icon is flipped upside down, the component described as "up" will become the component described as "down." When a structure is "up" of another structure, it may mean that the structure is integrally formed on the other structure, or that the structure is "directly" mounted on the other structure, or that the structure is "indirectly" mounted on the other structure through another structure.
[0041] The terms “a,” “one,” “the,” “the,” and “at least one” are used to indicate the presence of one or more elements / components / etc.; the terms “including” and “having” are used to indicate an open-ended inclusion and to mean that there may be other elements / components / etc. in addition to the listed elements / components / etc.; the terms “first,” “second,” and “third,” etc., are used only as markers and are not a limitation on the number of objects.
[0042] This disclosure provides an electrically operated zoom laser beam expander mechanism for a spectrometer; see [link to previous document]. Figure 1 and Figure 2 The beam expander mechanism includes a lens assembly and a drive assembly; the lens assembly includes a first lens 1, a second lens 2, a third lens 3 and a fourth lens 4 arranged sequentially along the optical axis; wherein, the first lens 1 and the fourth lens 4 are fixedly arranged, and the drive assembly is used to drive the second lens 2 and the third lens 3 to move linearly along the optical axis to achieve continuous zoom.
[0043] In this embodiment of the present disclosure, the motorized zoom laser beam expander mechanism for a spectrometer consists of a lens assembly and a drive assembly. The lens assembly consists of a first lens 1, a second lens 2, a third lens 3, and a fourth lens 4 arranged sequentially along the optical axis. The first lens 1 and the fourth lens 4 are fixedly arranged, while the second lens 2 and the third lens 3 are movably arranged. The drive assembly drives the second lens 2 and the third lens 3 to move linearly along the optical axis, adjusting the distance between the four lenses to form a zoom curve and achieve continuous zoom from 2X to 5X.
[0044] Compared to existing manual zoom methods, this motorized zoom laser beam expander mechanism for spectrometers uses a first lens, a second lens, a third lens, and a fourth lens arranged sequentially along the optical axis. The first and fourth lenses are fixed in place, and the positions of the second and third lenses are adjusted by a drive assembly. This allows for autonomous control of the magnification as needed, and the beam expander does not need to be disassembled during zooming, avoiding repeated adjustments to the detection optical path and improving the detection accuracy of the spectrometer.
[0045] In one embodiment of this disclosure, see [link to relevant documentation]. Figure 2 and Figure 6 The first lens 1 and the fourth lens 4 have positive optical power, while the second lens 2 and the third lens 3 have negative optical power. This allows for the cancellation of aberrations between multiple lenses during zooming, achieving a focusless optical path design and preventing focus drift from affecting the spectrometer's detection accuracy.
[0046] In one example, the first lens 1 is a biconvex positive lens, the second lens 2 is a biconcave negative lens, the third lens 3 is a plano-concave negative lens, and the fourth lens 4 is a biconvex positive lens.
[0047] In one embodiment of this disclosure, see [link to relevant documentation]. Figures 1 to 3 The beam expander mechanism further includes: a base 5, configured to extend along the optical axis; a guide rail 6, located at the top of the base 5, extending along the optical axis, on which a first slider 7 and a second slider 8 are sequentially slidably mounted; wherein a second lens 2 is mounted on the first slider 7, and a third lens 3 is mounted on the second slider 8; a driving assembly can drive the first slider 7 and the second slider 8 to move on the guide rail 6, so that the second lens 2 and the third lens 3 move linearly along the optical axis. This guides the movement of the second lens 2 and the third lens 3, improving their stability and the accuracy of magnification.
[0048] Optionally, a slot extending along the optical axis is provided at the top center of the base 5, and the guide rail 6 is fitted into the slot.
[0049] Optionally, the size of the guide rail 6 is smaller than the size of the base 5.
[0050] In one embodiment of this disclosure, see [link to relevant documentation]. Figures 1 to 3 The first lens 1 is mounted on the first mounting base 9, the second lens 2 is mounted on the second mounting base 10, the third lens 3 is mounted on the third mounting base 11, and the fourth lens 4 is mounted on the fourth mounting base 12. The first mounting base 9 and the fourth mounting base 12 are respectively located at the top ends of the two sides of the base 5. The second mounting base 10 is mounted on the first slider 7, and the third mounting base 11 is mounted on the second slider 8. In this way, the first lens 1 and the fourth lens 4 can be fixedly mounted, and the second lens 2 and the third lens 3 can be easily moved linearly along the optical axis by the drive assembly.
[0051] Optionally, mounting rings are provided in the first mounting base 9, the second mounting base 10, the third mounting base 11 and the fourth mounting base 12 respectively, and multiple lenses are detachably mounted in the mounting base through multiple mounting rings.
[0052] In one embodiment of this disclosure, mounting plates 13 are respectively provided on the bottom ends of both sides of the base 5, and the drive assembly is mounted on the mounting plates 13. In this way, the installation stability of the drive assembly can be improved, the movement stability of the second lens 2 and the third lens 3 can be improved, and the magnification accuracy can be improved.
[0053] Optionally, the two mounting plates 13 are arranged symmetrically.
[0054] In one embodiment of this disclosure, see [link to relevant documentation]. Figures 1 to 3 The drive assembly includes: two drive motors 14 mounted on one of the mounting plates 13; a screw 15 connected to the output end of the drive motors 14, with the other end of the screw 15 rotatably connected to the other mounting plate 13; and a moving block 16 threaded onto the screw 15, with guide rods 17 mounted on the moving block 16. One of the guide rods 17 is connected to the first slider 7, and the other guide rod 17 is connected to the second slider 8. Thus, the first slider 7 and the second slider 8 can be driven by threaded transmission, thereby moving the second lens 2 and the third lens 3, achieving autonomous control of the magnification as needed.
[0055] Optionally, the two drive motors 14 and the two screws 15 are arranged symmetrically.
[0056] In one embodiment of this disclosure, see [link to relevant documentation]. Figure 3 and Figure 4A first guide groove 18 extending along the optical axis is formed on one side wall of the base 5, and a second guide groove 19 extending along the optical axis is formed on the other side wall of the base 5. One of the two guide rods 17 passes through the first guide groove 18 or the second guide groove 19 and connects to the first slider 7, while the other guide rod 17 passes through the second guide groove 19 or the first guide groove 18 and connects to the second slider 8. This allows for guiding the movement of the two guide rods 17 and limiting their range of motion, thereby restricting the movement range of the second lens 2 and the third lens 3 and preventing collisions between the multiple lenses.
[0057] Optionally, the first guide groove 18 and the second guide groove 19 are offset.
[0058] In one example, the first guide groove 18 is located on the side of the base 5 near the first mounting base 9, and the second guide groove 19 is located on the side of the base 5 near the fourth mounting base 12.
[0059] In one example, the two drive motors 14 are the first drive motor and the second drive motor, the two screws 15 are the first screw and the second screw, the two moving blocks 16 are the first moving block and the second moving block, and the two guide rods 17 are the first guide rod and the second guide rod, respectively. The first screw is connected to the output end of the first drive motor, the second screw is connected to the output end of the second drive motor, the first moving block is threaded onto the first screw, the second moving block is threaded onto the second screw, the first guide rod is installed on the first moving block, the second guide rod is installed on the second moving block, the first guide rod passes through the first guide groove 18 and connects to the first slider 7, and the second guide rod passes through the second guide groove 19 and connects to the second slider 8.
[0060] It is understandable that starting the first drive motor drives the first slider 7 to move on the guide rail 6, which in turn moves the second lens 2 along the guide rail 6. Starting the second drive motor drives the second slider 8 to move on the guide rail 6, which in turn moves the third lens 3 along the guide rail 6.
[0061] Of course, the first drive motor and the second drive motor can be started separately, or the first drive motor and the second drive motor can be started simultaneously.
[0062] In one embodiment of this disclosure, the first guide groove 18 and the second guide groove 19 have different dimensions. This allows the second lens 2 and the third lens 3 to move at different distances, thus forming zoom curves of different amplitudes.
[0063] In one example, the length of the first guide groove 18 is greater than the length of the second guide groove 19.
[0064] In one embodiment of this disclosure, see [link to relevant documentation]. Figure 1 , Figure 2 and Figure 5A limit plate 20 is provided at the bottom of the mounting plate 13, and photoelectric switches 21 are respectively provided on both sides of the limit plate 20. Induction plates 22 corresponding to the photoelectric switches 21 on the same side are respectively provided on the two moving blocks 16. In this way, the movement range of the second lens 2 and the third lens 3 can be limited by photoelectric sensing, improving the safety of the beam expander mechanism.
[0065] Optionally, a first notch is formed by an inward recess on one side wall of the limiting plate 20, and a second notch is formed by an inward recess on the other side wall of the limiting plate 20. The first notch is located below the first guide groove 18, and the second notch is located below the second guide groove 19.
[0066] Optionally, photoelectric switches 21 are disposed at the bottom ends of both sides of the limiting plate 20, and sensing plates 22 are disposed at the bottom end of the moving block 16. The two sensing plates 22 move within the first notch and the second notch, respectively.
[0067] In one embodiment of this disclosure, the beam expander mechanism further includes a control system, which is electrically connected to two drive motors 14 and two photoelectric switches 21. This allows for intelligent control of the beam expander mechanism by controlling the start and stop of the drive motors 14 via the photoelectric switches 21, thereby improving the safety of the beam expander mechanism during use.
[0068] Optionally, the control system is a PLC controller.
[0069] In one embodiment of this disclosure, see [link to relevant documentation]. Figure 2 and Figure 6 Lens 1, 2, 3, and 4 are all spherical lenses. This reduces the manufacturing difficulty of each lens and improves their optical performance.
[0070] In one embodiment of this disclosure, see [link to relevant documentation]. Figure 6 The first lens 1 is a positive diopter biconvex lens made of fused silica, with a radius of curvature of 30.0 mm for both the front and rear convex surfaces and a center thickness of 4.0 mm. The second lens 2 is a negative diopter meniscus lens made of CaF2, with a radius of curvature of 45.0 mm for both the front and rear concave surfaces and a center thickness of 3.5 mm. The third lens 3 is a negative diopter plano-concave lens made of zinc selenide, with a radius of curvature of 60.0 mm for both the front and rear concave surfaces and a center thickness of 3.0 mm. The fourth lens 4 is a positive diopter plano-convex lens made of fused silica, with a radius of curvature of 120.0 mm for both the front and rear convex surfaces and a center thickness of 6.0 mm. The beam is collimated by these four lenses to ensure the parallelism of the laser beam output.
[0071] In the above embodiment, according to the formula for the combined focal length of thin lenses, the combined focal length f of two thin lenses spaced d apart satisfies 1 / f = 1 / f1 + 1 / f2 - d / f1f2, where f1 and f2 are the focal lengths of the two lenses, respectively. By changing the distance D1 between the first lens 1 and the second lens 2, the combined focal length f12 of the two lenses can be changed. By changing the distance D3 between the third lens 3 and the fourth lens 4, the combined focal length f34 of the two lenses can be changed, thereby changing the combined focal length of the entire lens group and achieving continuous zoom.
[0072] In one example, when the lens group is 2X zoom, the distance D1 between the first lens 1 and the second lens 2 is 12mm, the distance D2 between the second lens 2 and the third lens 3 is 8mm, and the distance D3 between the third lens 3 and the fourth lens 4 is 80mm; when the lens group is 5X zoom, the distance D1 between the first lens 1 and the second lens 2 is 2mm, the distance D2 between the second lens 2 and the third lens 3 is 3mm, and the distance D3 between the third lens 3 and the fourth lens 4 is 130mm.
[0073] Understandably, after the incident beam is diverged by the first lens 1, it enters the second lens 2 and diverges further. At this time, the beam is in a wide divergence state. The third lens 3 controls the beam divergence angle by adjusting the distance between itself and the second lens 2, ensuring that no focal point is formed between the third lens 3 and the fourth lens 4. The fourth lens 4 collimates the diverging beam into parallel light. Throughout the process, the beam diameter is always larger than the incident beam diameter to avoid energy concentration, thus forming a focusless variable magnification beam expander system.
[0074] Other embodiments of this disclosure will readily occur to those skilled in the art upon consideration of the specification and practice of the utility models disclosed herein. This application is intended to cover any variations, uses, or adaptations of this disclosure that follow the general principles of this disclosure and include common knowledge or customary techniques in the art not disclosed herein. The specification and examples are to be considered exemplary only, and the true scope and spirit of this disclosure are indicated by the appended claims.
Claims
1. An electrically motorized variable magnification laser beam expander mirror mechanism for use in a spectrometer, characterized by, The beam expander mechanism includes a lens assembly and a drive assembly; The lens assembly includes a first lens (1), a second lens (2), a third lens (3), and a fourth lens (4) arranged sequentially along the optical axis. The first lens (1) and the fourth lens (4) are fixedly disposed, and the driving component is used to drive the second lens (2) and the third lens (3) to move linearly along the optical axis to achieve continuous zoom.
2. The electrically operated variable magnification laser beam expander mechanism for a spectrometer according to claim 1, characterized in that, The first lens (1) and the fourth lens (4) have positive optical power, and the second lens (2) and the third lens (3) have negative optical power.
3. The electrically operated variable magnification laser beam expander mechanism for a spectrometer according to claim 1, characterized in that, The beam expander mechanism also includes: The base (5) is configured to extend along the optical axis; A guide rail (6) is provided at the top of the base (5). The guide rail (6) extends along the optical axis. A first slider (7) and a second slider (8) are slidably installed on the guide rail (6) along the optical axis. The second lens (2) is mounted on the first slider (7), and the third lens (3) is mounted on the second slider (8); The driving component can drive the first slider (7) and the second slider (8) to move on the guide rail (6) so that the second lens (2) and the third lens (3) move linearly along the optical axis.
4. The electrically operated variable magnification laser beam expander mechanism for a spectrometer according to claim 3, characterized in that, The first lens (1) is disposed on the first mounting base (9), the second lens (2) is disposed on the second mounting base (10), the third lens (3) is disposed on the third mounting base (11), and the fourth lens (4) is disposed on the fourth mounting base (12); The first mounting base (9) and the fourth mounting base (12) are respectively disposed on the top two sides of the base (5), the second mounting base (10) is mounted on the first slider (7), and the third mounting base (11) is mounted on the second slider (8).
5. The electrically operated variable magnification laser beam expander mechanism for a spectrometer according to claim 3, characterized in that, The base (5) has mounting plates (13) on both sides of its bottom end, and the drive assembly is mounted on the mounting plates (13).
6. The electrically operated variable-magnification laser beam expander mechanism for a spectrometer according to claim 5, characterized in that, The driving component includes: Two drive motors (14) are mounted on one of the mounting plates (13); A screw (15) is connected to the output end of the drive motor (14), and the other end of the screw (15) is rotatably connected to another mounting plate (13); A movable block (16) is threaded onto the screw (15), and a guide rod (17) is mounted on the movable block (16); One of the two guide rods (17) is connected to the first slider (7), and the other of the two guide rods (17) is connected to the second slider (8).
7. The electrically operated zoom laser beam expander mechanism for a spectrometer according to claim 6, characterized in that, The base (5) has a first guide groove (18) extending along the optical axis on one side wall and a second guide groove (19) extending along the optical axis on the other side wall. One of the two guide rods (17) passes through the first guide groove (18) or the second guide groove (19) and is connected to the first slider (7), while the other of the two guide rods (17) passes through the second guide groove (19) or the first guide groove (18) and is connected to the second slider (8).
8. The electrically operated variable magnification laser beam expander mechanism for a spectrometer according to claim 7, characterized in that, The first guide groove (18) and the second guide groove (19) have different dimensions.
9. The electrically operated zoom laser beam expander mechanism for a spectrometer according to claim 5, characterized in that, The mounting plate (13) is provided with a limiting plate (20) at the bottom. Photoelectric switches (21) are provided on both sides of the limiting plate (20). The two moving blocks (16) are provided with sensing plates (22) corresponding to the photoelectric switches (21) on the same side.
10. The electrically operated zoom laser beam expander mechanism for a spectrometer according to claim 1, characterized in that, The first lens (1), the second lens (2), the third lens (3) and the fourth lens (4) are all spherical lenses.