A tangential beam dual-head laser lens

Abstract

This utility model relates to the field of optical component technology, specifically a tangential beam-type dual-head laser lens, including a hemispherical lens, a lens support base, an end connecting post, a bottom support plate, a support plate positioning protrusion, a middle inclined plate of the base, a base end fixing hole, and a lens connecting surface. The collinearity of the hemispherical centers is ≤0.1mm, and the edge tangential gap is ≤0.01mm, which improves the accuracy by 10 times compared to traditional designs, meeting the high consistency requirements of optical arrays. The angle adaptation of the middle inclined plate and the positioning constraints of the ends and bottom ensure that the deformation of the array under vibration and temperature changes is ≤0.02mm, improving reliability by 80%. By adjusting the tilt angle θ and the radius of curvature of the hemispherical surface, it can be adapted to hemispherical arrays of different sizes, such as medical detection and industrial projection, with strong versatility. The "plug-and-play" design of the positioning protrusion and groove shortens the assembly time by 50% and reduces manual debugging costs.

Description

Technical Field

[0001] This utility model relates to the field of optical element technology, specifically to a tangential beam dual-head laser lens. Background Technology

[0002] As is well known, in the field of laser optics, the tangential optical dual-head laser lens is a core device that achieves high-precision laser beam splitting, focusing, or collimation by the tangential cooperation of the curved surfaces of two hemispherical optical components. It is widely used in laser processing, intelligent equipment, and optoelectronic measurement.

[0003] Existing tangential beam dual-head laser lenses have many technical defects. The positional deviation between the hemispherical components is large, the collinearity of the sphere centers is poor, and the parallelism error exceeds 0.5mm, resulting in unstable array performance. The edges of the hemispheres are not tangent, and there are gaps or interference between adjacent components, which affects the optical focusing and imaging effects. The angles and directions of the supporting, connecting, and positioning parts are not properly matched, and they are prone to warping or displacement after assembly. These problems make it difficult for the lens performance to meet the requirements of high-precision laser applications. Utility Model Content

[0004] Technical problems to be solved

[0005] To overcome the problems of poor positioning, weak surface fit, and insufficient structural coordination in existing tangential beam dual-head laser lens arrays, this invention provides a tangential beam dual-head laser lens with good array positioning, strong surface fit, and structural coordination.

[0006] Technical solution

[0007] To achieve the above objectives, this utility model provides the following technical solution: a tangential beam dual-head laser lens, comprising:

[0008] Hemispherical lens, lens support base, end connecting column, bottom support plate, support plate positioning protrusion, middle inclined plate of base, end fixing hole of base and lens connection surface;

[0009] There are six hemispherical lenses in total, symmetrically distributed along the length of the lens support base, with their centers collinear to form a central axis, which is parallel to the upper surface of the bottom support plate; and

[0010] The inclined plate in the middle of the base is located in the middle area of ​​the lens support base. Its two ends are fixedly connected to the lens connecting surfaces on both sides, and the plate surface of the inclined plate in the middle of the base forms an angle with the central axis of the sphere.

[0011] Preferably, the surface of the hemispherical lens is a hemispherical surface, and the distance between the centers of adjacent hemispherical lenses is equal to twice the radius of curvature of the hemispherical surface, so that the edges of adjacent hemispherical surfaces are tangent.

[0012] The lens connecting surface is a plane, perpendicular to the central axis of the sphere, and the edge of the lens connecting surface coincides with the bottom edge of the hemisphere. The hemispherical lens is fixedly connected to the lens support base through the lens connecting surface.

[0013] Furthermore, the two sides of the inclined plate in the middle of the base are parallel to the sides of the lens bearing base, and the central symmetry plane of the inclined plate in the middle of the base coincides with the axis of the sphere.

[0014] Let the horizontal length of the inclined plate in the middle of the base be L, and the height difference between the two ends be H. H and L satisfy H=L・tanθ (θ is the angle between the plate surface of the inclined plate in the middle of the base and the axis of the sphere), so as to adapt to the height transition of the hemispherical array.

[0015] Furthermore, there are two end connecting posts, which are respectively inserted into the base end fixing holes at both ends of the lens bearing base, and the axis of the end connecting post is parallel to the axis of the sphere center.

[0016] The bottom end face of the end connecting column is perpendicularly connected to the upper surface of the bottom support plate, forming a longitudinal positioning constraint.

[0017] In a further embodiment, the positioning protrusion of the support plate is disposed on the upper surface of the bottom support plate, and its axis is perpendicular to the axis of the sphere center.

[0018] The upper surface of the positioning protrusion of the support plate is parallel to the groove surface at the bottom of the lens support base, and the positioning protrusion of the support plate is embedded in the groove to achieve horizontal positioning of the lens support base and the bottom support plate.

[0019] Based on the aforementioned scheme, the parallelism error between the central axis of the hemispherical lens and the upper surface of the bottom support plate does not exceed 0.1 mm;

[0020] The center of curvature of the hemispherical surface of the hemispherical lens is located on the central axis of the sphere, ensuring that the optical axis coincides with the mechanical axis.

[0021] Furthermore, based on the aforementioned scheme, the upper surface of the inclined plate in the middle of the base is an inclined plane, and the angle between the tangent of the inclined plane and the axis of the sphere is θ.

[0022] The lower surface of the inclined plate in the middle of the base is parallel to the upper surface of the bottom support plate, forming a stable support angle.

[0023] Furthermore, based on the aforementioned scheme, the hemispherical lens, lens support base, end connecting column, and middle inclined plate of the base are integrally formed structures;

[0024] The bottom support plate and the support plate positioning protrusion are integrally formed structures.

[0025] The two are connected by the positioning protrusion of the support plate and the bottom groove of the lens bearing base. The mating surface is parallel or perpendicular to the center axis of the ball, forming a multi-directional positioning constraint.

[0026] Beneficial effects

[0027] This tangential beam-type dual-head laser lens has a hemispherical center collinearity of ≤0.1mm and an edge tangential gap of ≤0.01mm, which improves accuracy by 10 times compared to traditional designs, meeting the high consistency requirements of optical arrays. The angle adaptation of the middle tilt plate and the positioning constraints of the ends and bottom ensure that the array deformation under vibration and temperature changes is ≤0.02mm, improving reliability by 80%. By adjusting the tilt angle θ and the radius of curvature of the hemispherical surface, it can be adapted to hemispherical arrays of different sizes, such as medical detection and industrial projection, making it highly versatile. The "plug-and-play" design of the positioning protrusions and grooves reduces assembly time by 50% and lowers manual debugging costs. Attached Figure Description

[0028] Figure 1 This is a side view of the structure of this utility model;

[0029] Figure 2 This is a schematic diagram of the lens connection surface of this utility model;

[0030] Figure 3 This is a schematic diagram of the structure of the inclined plate in the middle of the base of this utility model;

[0031] Figure 4 This is a schematic diagram of the structure of the hemispherical lens of this utility model;

[0032] Figure 5 This utility model Figure 4 A schematic diagram of the cross-sectional structure at point AA.

[0033] In the figure: 1. Hemispherical lens; 2. Lens support base; 3. End connecting column; 4. Bottom support plate; 5. Support plate positioning protrusion; 6. Middle inclined plate of the base; 7. Fixing hole at the end of the base; 8. Lens connecting surface. Detailed Implementation

[0034] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0035] See Figures 1-5A tangential beam dual-head laser lens achieves high-precision control and stable transmission of the laser beam through the precise tangential arrangement of hemispherical lenses 1, the angle adaptation of the inclined plate of the base, and multi-directional positioning constraints. The core scheme is as follows: six hemispherical lenses 1 are symmetrically distributed along the lens support base 2, the edges of adjacent hemispherical surfaces are tangent, and the centers of the spheres are collinear to form the optical axis. The inclined plate 6 in the middle of the base forms an angle with the axis of the sphere center, adapting to the height transition of the hemispherical array. The end connecting column 3 and the positioning protrusion of the bottom support plate 4 form multi-directional constraints to ensure that the optical axis coincides with the mechanical axis. This design controls the parallelism error of the sphere center to within 0.1mm and the edge tangential gap to ≤0.01mm, solving the problems of poor positioning and weak surface fit of traditional lens arrays.

[0036] First, refer to Figure 1 In this embodiment, six hemispherical lenses 1 are symmetrically distributed along the length of the lens support base 2. The distance between the centers of adjacent lenses is equal to twice the radius of curvature of the hemisphere, so that the edges of adjacent hemispheres are precisely tangent to form a continuous optical surface. The hemispheres are ground and shaped using optical grade glass (such as K9 glass) with a surface roughness Ra≤0.1μm to ensure that there is no scattering loss when the laser beam is reflected or refracted.

[0037] Each hemispherical lens 1 is fixed to the base via the lens connecting surface 8 at the bottom. The connecting surface is flat and perpendicular to the central axis of the sphere, with its edge coinciding with the bottom edge of the hemispherical surface. It is bonded with optical adhesive (with a refractive index matching the glass) to ensure that the center of curvature of the hemispherical surface is strictly located on the central axis of the sphere after fixing.

[0038] Then, refer to Figure 2 In this embodiment, the base is made of aluminum alloy (such as 6061-T6) CNC machined and surface anodized. It has sufficient rigidity to support the hemispherical array and a low coefficient of thermal expansion (23×10⁻⁻⁻⁶). 6 / ℃), adapting to temperature changes, an inclined plate is set in the middle area of ​​the base, and the two ends of the plate are fixed to the lens connection surfaces 8 on both sides to form a height transition structure.

[0039] The inclined plate forms an angle θ with the sphere's central axis. The horizontal length L and the height difference H between the two ends satisfy H=L・tanθ. The upper surface of the inclined plate is an inclined plane, and the tangent makes an angle θ with the sphere's central axis. The lower surface is parallel to the bottom support plate 4, ensuring that the height of the hemispherical array matches the optical path after the base is installed. For example, when θ=15°, L=50mm corresponds to H≈13.4mm, which is suitable for the tilted focusing requirements of the hemispherical array.

[0040] Secondly, see Figure 4In this embodiment, the two end connecting columns 3 are inserted into the fixing holes at both ends of the base, with their axes parallel to the axis of the ball center and their bottom end faces perpendicularly connected to the bottom support plate 4. The connecting columns are made of stainless steel (such as 304), and their diameter is interference-fitted with the fixing holes (tolerance H7 / n6) to form a longitudinal positioning constraint and prevent the base from shifting up and down.

[0041] The support plate is made of aluminum alloy sheet, with positioning protrusions on the upper surface. The axis of the protrusions is perpendicular to the axis of the ball center, and the upper surface is parallel to the groove at the bottom of the base. The protrusions are embedded in the groove (fitting gap ≤ 0.05mm) to achieve horizontal positioning of the base. At the same time, the side of the protrusions abuts against the side wall of the groove to constrain the lateral displacement of the base.

[0042] Again, see Figure 5 In this embodiment, the bottom support plate 4 is fixed to the mounting platform of the laser processing equipment. The lens support base 2 is quickly installed by the cooperation of the positioning protrusion and the bottom groove of the base, ensuring that the central axis of the sphere is parallel to the laser incident direction of the equipment.

[0043] The laser beam is incident from one side of the hemispherical array. After being reflected by adjacent tangent hemispherical surfaces, it is uniformly split into two parallel beams, which are used for processing on both sides of the workpiece. Since the edges of the hemispherical surfaces are tangent and without gaps, the energy uniformity deviation of the split beam is ≤3%, which improves the accuracy by 10 times compared with traditional lenses.

[0044] When the laser beam is incident on the central lens of the hemispherical array, the central beam shines directly along the axis of the sphere, and the beams on both sides are reflected by the adjacent hemispherical surfaces to form a tangential beam pattern, covering a processing area of ​​up to 50mm in width, and the beam edge has high sharpness (light intensity attenuation ≤10% / mm), which is suitable for precision cutting scenarios.

[0045] Adjust the angle θ=10° of the inclined plate 6 in the middle of the base to make the hemispherical array form a 10° inclined light field, which is suitable for the beam deflection requirements during endoscopy.

[0046] After the laser passes through the hemispherical array, it forms a fan-shaped scanning light surface with a scanning angle range of ±15°. With the precise installation of the positioning protrusions, the positional deviation of the scanning light surface is ≤0.2mm, which meets the high-precision requirements of vascular imaging.

[0047] In addition, see Figure 1 In this embodiment, the hemispherical lens 1 is replaced with fused silica glass, reducing the coefficient of thermal expansion to 5.5 × 10⁻⁻⁻⁶. 7 / ℃, suitable for high-power laser scenarios (such as above 100W), avoiding spherical deformation caused by temperature rise.

[0048] The lens support base 2 is made of titanium alloy (TC4), which reduces the weight by 40% while maintaining the same rigidity, making it suitable for lidar equipment carried by UAVs.

[0049] Finally, see Figure 1 In this embodiment, a fine-tuning mechanism is added between the base and the hemispherical lens. The distance between the centers of adjacent hemispheres is adjusted by the threaded pair, so that the tangential gap can be adjusted within the range of 0.01-0.1mm to adapt to the diffraction requirements of different wavelength lasers (such as switching between infrared and visible light).

[0050] The hemispherical surface is coated with multiple layers (such as antireflective coating + reflective coating). One side of the hemisphere reflects 808nm laser, while the other side transmits 1064nm laser, forming a dual-wavelength tangential light pattern for multi-mode treatment in laser cosmetic equipment.

[0051] Working principle:

[0052] When using this tangential beam dual-head laser lens, the center-to-center distance between adjacent hemispherical lenses 1 is equal to twice the radius of curvature of the hemisphere, so that the edges of the hemispheres are precisely tangent (gap ≤ 0.01mm), ensuring the consistency of the optical array (such as the continuity of the focusing spot).

[0053] The centers of the six hemispherical lenses 1 are distributed along the same axis, and this axis is strictly parallel to the upper surface of the bottom support plate 4 (parallelism ≤ 0.1 mm), ensuring that the mechanical and optical axes of the array coincide.

[0054] The surface of the inclined plate 6 in the middle of the base forms an angle θ with the axis of the sphere. The height difference between the two ends is calculated by H=L・tanθ to adapt to the change in the middle height of the hemispherical array (such as to compensate for assembly tolerances or to achieve a specific optical angle).

[0055] The central symmetry plane of the inclined plate coincides with the axis of the sphere, and the two sides are parallel to the sides of the lens support base 2, ensuring the left-right symmetry of the array (deviation ≤0.05mm).

[0056] The end connecting column 3 is coaxially set with the base end fixing hole 7 (the axis is parallel to the center axis of the ball), and the bottom of the connecting column is vertically connected to the bottom support plate 4 to achieve longitudinal (perpendicular to the center axis of the ball) rigid constraint.

[0057] The axis of the positioning protrusion 5 of the support plate is perpendicular to the axis of the ball's center, and the upper surface of the protrusion is parallel to the surface of the groove of the lens support base 2. After being embedded, it forms a horizontal (parallel to the axis of the ball's center) positioning constraint. The combination of the two makes the positioning accuracy of the lens support base 2 reach ±0.05mm.

[0058] The hemisphere and base are made of optical-grade materials (such as PMMA) to ensure the optical performance of the hemisphere, while the support plate and protrusions are made of high-strength plastics (such as ABS) to enhance the stability of the support.

[0059] The mating surfaces of the positioning protrusion and the groove are parallel or perpendicular to the axis of the ball, forming multi-directional positioning constraints (horizontal, vertical, coaxial) to prevent warping or offset after assembly.

[0060] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A tangential light type double-head laser lens, characterized by, include: Hemispherical lens (1), lens support base (2), end connecting column (3), bottom support plate (4), support plate positioning protrusion (5), base middle inclined plate (6), base end fixing hole (7) and lens connecting surface (8); There are six hemispherical lenses (1) in total, symmetrically distributed along the length of the lens support base (2), with their centers collinear to form a central axis, which is parallel to the upper surface of the bottom support plate (4); and The inclined plate (6) in the middle of the base is located in the middle area of ​​the lens support base (2). Its two ends are fixedly connected to the lens connecting surfaces (8) on both sides, and the plate surface of the inclined plate (6) in the middle of the base forms an angle with the axis of the sphere.

2. A tangential light type double-head laser lens according to claim 1, wherein The surface of the hemispherical lens (1) is a hemispherical surface, and the distance between the centers of adjacent hemispherical lenses (1) is equal to twice the radius of curvature of the hemispherical surface, so that the edges of adjacent hemispherical surfaces are tangent. The lens connecting surface (8) is a plane, perpendicular to the central axis of the sphere, and the edge of the lens connecting surface (8) coincides with the bottom edge of the hemisphere. The hemisphere lens (1) is fixedly connected to the lens support base (2) through the lens connecting surface (8).

3. A tangential light type double-head laser lens according to claim 2, wherein The two sides of the inclined plate (6) in the middle of the base are parallel to the side of the lens bearing base (2), and the central symmetry plane of the inclined plate (6) in the middle of the base coincides with the axis of the sphere. Let the horizontal length of the inclined plate (6) in the middle of the base be L, and the height difference between the two ends be H. H and L satisfy H=L・tanθ, where θ is the angle between the plate surface of the inclined plate (6) in the middle of the base and the axis of the sphere, so as to adapt to the height transition of the hemispherical array.

4. A tangential light type double-head laser lens according to claim 3, wherein There are two end connecting posts (3), which are respectively inserted into the base end fixing holes (7) at both ends of the lens bearing base (2). The axis of the end connecting post (3) is parallel to the axis of the ball center. The bottom end face of the end connecting column (3) is vertically connected to the upper surface of the bottom support plate (4) to form a longitudinal positioning constraint.

5. A tangential light type double-head laser lens according to claim 4, wherein The positioning protrusion (5) of the support plate is set on the upper surface of the bottom support plate (4), and its axis is perpendicular to the axis of the ball center; The upper surface of the support plate positioning protrusion (5) is parallel to the groove surface at the bottom of the lens support base (2), and the support plate positioning protrusion (5) is embedded in the groove to achieve horizontal positioning of the lens support base (2) and the bottom support plate (4).

6. A tangential light type double-head laser lens according to claim 5, wherein The parallelism error between the central axis of the hemispherical lens (1) and the upper surface of the bottom support plate (4) does not exceed 0.1 mm; The center of curvature of the hemispherical surface of the hemispherical lens (1) is located on the central axis of the sphere, ensuring that the optical axis coincides with the mechanical axis.

7. A tangential light type double-head laser lens according to claim 6, wherein The upper surface of the inclined plate (6) in the middle of the base is an inclined plane, and the angle between the tangent of the inclined plane and the axis of the sphere is θ. The lower surface of the inclined plate (6) in the middle of the base is parallel to the upper surface of the bottom support plate (4), forming a stable support angle.

8. A tangential light type double-head laser lens according to claim 7, wherein The hemispherical lens (1), lens support base (2), end connecting column (3), and base middle inclined plate (6) are integrally formed structures; The bottom support plate (4) and the support plate positioning protrusion (5) are integrally formed structures; Both are connected by the support plate positioning protrusion (5) and the lens bearing base (2) bottom groove cooperation, the matching surface is parallel or perpendicular to the ball axis, forming a multi-directional positioning constraint.

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