Bessel optical mechanism
By employing a two-dimensional fine-tuning mirror and an aperture adjustment mount in the Bessel optical module, the problems of increased equipment height and complex debugging are solved, achieving equipment stability and cost reduction, while also supporting compatibility with multi-depth-of-focus designs.
Patent Information
- Application Number
- CN202423290252.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-31
- Publication Date
- 2026-01-02
- Estimated Expiration
- 2034-12-31
AI Technical Summary
The existing Bessel optical module has a fixed structure, which leads to increased equipment height, unstable center of gravity, high cost, complicated and inconvenient debugging, and incompatibility with multiple depth-of-focus designs.
The module housing features a reflector design, combined with an adjustment base and an aperture adjustment base. Through the two-dimensional fine-tuning structure of the reflector and the rotational adjustment of the aperture, a compact optical path layout is achieved, which also supports convenient lens replacement and multi-depth-of-focus design.
It effectively reduces equipment height, lowers costs, simplifies the debugging process, improves equipment stability, and supports compatibility with various focal depth designs.
Smart Images
Figure CN223748751U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to laser processing technical field, concretely points to a kind of Bezier optical mechanism. BACKGROUND
[0002] In the process of laser precision manufacturing, such as cutting and punching processing of transparent brittle materials such as glass, sapphire and quartz, a non-diffraction Bessel optical path transmission system is usually used, which combines ultrafast laser pulses, uses beam expansion, axicon and objective lens to convert the incident Gaussian energy into Bessel optical energy distribution, realizes the optical system of long axial focal depth after focusing, compared with Gaussian energy distribution, the focused Bessel optics has the advantages of long axial focal depth and energy distribution concentration, and is very suitable for high aspect ratio cutting and micro-hole manufacturing. Unlike Gaussian optical system, Bessel optical system is more complex and more sensitive to optical path transmission stability. For example, the Bessel processing head needs to fly at high speed, and the optical path stability under high-speed dynamic motion conditions directly determines the processing quality.
[0003] The existing Bessel optical module generally adopts straight cylinder type design, and the axicon, lens and collimating objective lens are arranged in a straight line along the optical design distance to form a straight cylinder. The Bessel optical module is generally fixed on the lifting shaft of the marble facade, and the straight-line arrangement structure increases the height of the facade, which requires increasing the thickness of the optical path marble and the overall height of the equipment, and the improvement of the gravity center of the equipment requires adding more counterweights to ensure the stability of the equipment, which increases the overall equipment cost. Especially, the internal lens of the existing Bessel optical module is generally fixed by the one-time curing method, which does not have the structure of secondary adjustment and convenient replacement of internal lens, and cannot be compatible with multiple focal depth designs by replacing internal components, which requires high machining precision of the module cavity and high technical requirements for the initial debugging personnel, and improper installation and debugging may cause module scrap, which increases the debugging cost.
[0004] Therefore, the prior art still needs to be improved and developed. UTILITY MODEL CONTENTS
[0005] The utility model aims at the defects and deficiencies of prior art, and provides a Bessel optical mechanism which is reasonable in structure, compact in layout and flexible to use.
[0006] In order to achieve the above purpose, the utility model adopts the following technical scheme:
[0007] The utility model relates to a kind of bessel optical mechanisms, including module shell, the upper end of the module shell is equipped with entrance window, the lower end of module shell is equipped with objective lens, and shaft prism module is equipped in module shell;First mirror and second mirror are equipped between the objective lens and shaft prism module, entrance window, shaft prism module and first mirror are sequentially arranged to constitute straight line light path;Second mirror is oppositely arranged at the side of first mirror, and first mirror, second mirror and objective lens are sequentially arranged to constitute right-angle light path.
[0008] According to the above scheme, the first mirror and the second mirror are both provided with an adjusting seat, and the first mirror and the second mirror are both fixedly arranged on the module shell through the adjusting seat.
[0009] According to the above scheme, the shaft prism module includes a fixing frame, a shaft prism mirror and a convex lens, the fixing frame is fixedly arranged on the module shell, and the fixing frame is provided with a coaxially arranged first lens barrel and a second lens barrel; the shaft prism mirror is arranged in the first lens barrel and connected therewith, and the convex lens is arranged in the second lens barrel and connected therewith.
[0010] According to the above scheme, the shaft prism mirror is fixed in the first lens barrel by a compression ring, and the convex lens is fixed in the second lens barrel by a compression ring.
[0011] According to the above scheme, the shaft prism mirror is bonded in the first lens barrel, and the convex lens is bonded in the second lens barrel.
[0012] According to the above scheme, the entrance window is provided with an aperture adjusting seat, and the aperture adjusting seat is fixedly connected with the module shell; the aperture adjusting seat is provided with an entrance aperture and a detachable cover plate.
[0013] According to the above scheme, a first aperture is arranged between the entrance window and the shaft prism module, a second aperture is arranged between the shaft prism module and the first mirror, and a third aperture is arranged between the first mirror and the second mirror.
[0014] According to the above scheme, the utility model further includes a half-wave plate, the first aperture is mounted in the module shell through a mounting bracket, and the half-wave plate is arranged on the mounting bracket instead of the first aperture.
[0015] The utility model has the beneficial effects that: the utility model has reasonable structure, in the case that the light path length between the entrance window, the shaft prism module and the objective lens is unchanged, the overall height of the module shell is compressed through two mirrors, and the equipment space and cost are saved. BRIEF DESCRIPTION OF DRAWINGS
[0016] Fig. 1 is the internal structure schematic view of the module shell of the utility model;
[0017] Fig. 2It is the structure schematic diagram of the incident diaphragm and diaphragm adjusting seat of the utility model.
[0018] Fig. 3 It is the structure schematic diagram of the utility model's axial prism module section view.
[0019] In the drawing,
[0020] 1, module shell; 2, axial prism module; 3, diaphragm adjusting seat; 11, incident window; 12, objective lens; 13, half-wave plate; 14, mounting bracket; 21, first mirror; 22, second mirror; 23, adjusting seat; 24, fixed frame; 25, axial prism mirror; 26, convex lens; 27, first lens barrel; 28, second lens barrel; 29, compression ring; 31, incident diaphragm; 32, cover plate; 33, first diaphragm; 34, second diaphragm; 35, third diaphragm. DETAILED DESCRIPTION
[0021] The technical scheme of the utility model will be described below in combination with the drawings and embodiments.
[0022] As Figs. 1-3 shown, the utility model discloses a kind of Bessel optical mechanisms, including module shell 1, the upper end of the module shell 1 is equipped with incident window 11, the lower end of module shell 1 is equipped with objective lens 12, axial prism module 2 is equipped in module shell 1;The first mirror 21 and second mirror 22 are equipped between objective lens 12 and axial prism module 2, incident window 11, axial prism module 2 and first mirror 21 are sequentially arranged to constitute straight line light path;Second mirror 22 is oppositely arranged at the side of first mirror 21, and first mirror 21, second mirror 22 and objective lens 12 are sequentially arranged to constitute right-angle light path.
[0023] The incident window 11, axial prism module 2, first mirror 21, second mirror 22 and objective lens 12 are sequentially arranged to constitute processing light path, wherein the first mirror 21 and second mirror 22 change the propagation direction of laser, but the light path length between incident window 11 and axial prism module 2, between axial prism module 2 and objective lens 12 is unchanged, but the height of module shell 1 as a whole is effectively compressed, so as to save equipment space and manufacturing cost.
[0024] Further, the first mirror 21 and second mirror 22 are each equipped with adjusting seat 23, and the first mirror 21 and second mirror 22 are fixedly arranged on the module shell 1 by the adjusting seat 23, and the adjusting seat 23 is equipped with two-dimensional fine adjustment structure.The adjusting seat 23 is used for mounting the first mirror 21 and second mirror 22 on the module shell 1, in order to facilitate debugging, two-dimensional fine adjustment structure is equipped between adjusting seat 23 and first mirror 21 / second mirror 22, and two-dimensional fine adjustment structure can adjust the pitch angle of first mirror 21 / second mirror 22, so as to deflect the direction of laser propagation.
[0025] The shaft prism module 2 comprises a fixing frame 24, a shaft prism 25 and a convex lens 26, the fixing frame 24 is fixedly arranged on the module shell 1, and the fixing frame 24 is provided with coaxially arranged first and second lens barrels 27 and 28; the shaft prism 25 is arranged in the first lens barrel 27 and is connected therewith, and the convex lens 26 is arranged in the second lens barrel 28 and is connected therewith. The first and second lens barrels 27 and 28 are coaxially arranged on the fixing frame 24, so that the shaft prism 25 and the convex lens 26 are oppositely arranged with a relatively determined spacing therebetween. It can be understood that the fixing frame 24 can be provided with clamping structures and pins to prevent the first and second lens barrels 27 and 28 from moving.
[0026] The shaft prism 25 is fixed in the first lens barrel 27 by a compression ring 29, and the convex lens 26 is fixed in the second lens barrel 28 by the compression ring 29. The inner wall of the first lens barrel 27 is provided with threads, the compression ring 29 is connected with the first lens barrel 27 through the threads, and a wave spring is arranged between the compression ring 29 and the shaft prism 25, so that the shaft prism 25 is fixed in the first lens barrel 27. The convex lens 26 is also fixed in the second lens barrel 28 in the same way, and the compression ring 29 allows the shaft prism 25 and the convex lens 26 to be disassembled, so as to facilitate replacement of components to be compatible with multiple focal depth designs.
[0027] The shaft prism 25 is bonded in the first lens barrel 27, and the convex lens 26 is bonded in the second lens barrel 28. In the case where the components do not need to be replaced, the shaft prism 25 and the convex lens 26 can be fixed in the lens barrel 27 using ultraviolet curing glue, so that the light path in the module shell 1 is better sealed.
[0028] The incident window 11 is provided with an aperture adjustment seat 3, and the aperture adjustment seat 3 is fixedly connected with the module shell 1; the aperture adjustment seat 3 is provided with an incident aperture 31 and a detachable cover plate 32. The aperture adjustment seat 3 can adjust the incident aperture 31, that is, correct the external light path, so as to avoid problems such as interference with the light path caused by opening and debugging the module shell 1. Opening the cover plate 32 can put a frequency doubling sheet into the aperture adjustment seat 3, so as to observe the size of the infrared laser spot, the energy distribution and whether the spot center is consistent with the aperture center.
[0029] The first diaphragm 33 is arranged between the entrance window 11 and the axicon module 2, the second diaphragm 34 is arranged between the axicon module 2 and the first mirror 21, and the third diaphragm 35 is arranged between the first mirror 21 and the second mirror 22. Specifically, the first diaphragm 33, the second diaphragm 34 and the third diaphragm 35 are all installed in the module shell 1 through the mounting frame 14, the diaphragm is changed in diameter by rotating, that is, the first diaphragm 33, the second diaphragm 34 and the third diaphragm 35 can rotate, so that the straight line formed by the center is parallel to the light path, when debugging, the laser passes through the center points of the first diaphragm 33, the second diaphragm 34 and the third diaphragm 35 at the same time, and the laser can pass through the axicon module 2 vertically and centrally.
[0030] The utility model also includes half wave sheet 13, first diaphragm 33 is installed in module shell 1 through mounting frame 14, and half wave sheet 13 can replace first diaphragm 33 and be arranged on mounting frame 14. The utility model adds half wave sheet 13 can form the Bessel light beam of oval of Gauss laser, and forms Bessel processing light beam after imaging focus through objective 12, and it is favorable to crack formation in cutting application. When the hole forming process is needed, the half wave sheet 13 is removed
[0031] The above is only the preferred embodiment of the utility model, therefore, the equivalent change or modification of the structure, features and principle, which is described in the patent application range of the utility model, is included in the patent application range of the utility model.
Claims
1. A Bessel optical mechanism, comprising a module housing (1), wherein an entrance window (11) is provided at the upper end of the module housing (1), an objective lens (12) is provided at the lower end of the module housing (1), and an axial pyramid module (2) is provided inside the module housing (1); characterized in that: The first mirror (21) and the second mirror (22) are provided with adjusting seats (23), and the first mirror (21) and the second mirror (22) are fixedly arranged on the module shell (1) through the adjusting seats (23), and the adjusting seat (23) is provided with a two-dimensional fine adjustment structure.
2. The Bessel optical organ according to claim 1, characterized in that: The shaft prism module (2) comprises a fixing frame (24), a shaft prism mirror (25) and a convex lens (26), the fixing frame (24) is fixedly arranged on the module shell (1), and the fixing frame (24) is provided with coaxially arranged first and second lens barrels (27) and (28); the shaft prism mirror (25) is arranged in the first lens barrel (27) and is connected with the first lens barrel (27), and the convex lens (26) is arranged in the second lens barrel (28) and is connected with the second lens barrel (28).
3. The Bessel optical organ of claim 1, wherein: The shaft prism mirror (25) is fixed in the first lens barrel (27) through a compression ring (29), and the convex lens (26) is fixed in the second lens barrel (28) through the compression ring (29).
4. The Bessel optical organ of claim 3, wherein: The shaft prism mirror (25) is fixed in the first lens barrel (27) through a compression ring (29), and the convex lens (26) is fixed in the second lens barrel (28) through the compression ring (29).
5. The Bessel optical organ of claim 3, wherein: The shaft prism mirror (25) is fixed in the first lens barrel (27) through a compression ring (29), and the convex lens (26) is fixed in the second lens barrel (28) through the compression ring (29).
6. The Bessel optical organ of claim 1, wherein: The incident window (11) is provided with an aperture adjusting seat (3), and the aperture adjusting seat (3) is fixedly connected with the module shell (1); the aperture adjusting seat (3) is provided with an incident aperture (31) and a detachable cover plate (32).
7. The Bessel optical organ of claim 1, wherein: The incident window (11) and the shaft prism module (2) are provided with a first aperture (33), the shaft prism module (2) and the first mirror (21) are provided with a second aperture (34), and the first mirror (21) and the second mirror (22) are provided with a third aperture (35).
8. The Bessel optical organ of claim 7, wherein: Further comprising a half-wave plate (13), the first aperture (33) is installed in the module shell (1) through a mounting frame (14), and the half-wave plate (13) is arranged on the mounting frame (14) instead of the first aperture (33).