Laser collimating lens group

Abstract

The utility model belongs to the field of laser collimating lens groups, and particularly relates to a laser collimating lens group, which comprises a biconcave lens, a plano-concave lens, a biconvex lens and a plano-convex lens, and is characterized in that an adjustable spacing assembly is arranged between the biconcave lens and the plano-concave lens; the spacing-adjustable assembly comprises installation cylinders which are connected to the surfaces of the biconcave lens, the plano-concave lens, the biconvex lens and the plano-convex lens in a sleeving mode respectively. The surfaces of one ends of the installation cylinders and the inner walls of the other ends of the installation cylinders are provided with thread lines. Through the design of the thread line structure at the two ends of the installation cylinder of the interval-adjustable assembly and the cooperation of the wave-shaped cross section structure of the elastic compensation ring, the dynamic adjustment of the air gap between the biconcave lens and the plano-concave lens and the assembly tolerance compensation function are achieved, and meanwhile the thermal expansion compensation rings are arranged at intervals in the axial direction of the inner wall of the installation cylinder. And the thermal deformation difference between the lens and the mounting cylinder is offset by using the material with the adjustable thermal expansion coefficient, so that the optical axis stability of the lens group in a temperature change environment is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to laser collimation lens group field, specifically a kind of laser collimation lens group. BACKGROUND

[0002] In current optical field, laser is widely applied in industrial processing, communication, scientific research and medical treatment and many other fields due to its high intensity, high parallelism and high wavelength stability. However, in order to meet the special needs of laser spot size and uniformity in different application scenarios, it is usually necessary to expand the original laser beam (increase the transverse size of laser beam) and collimate (convert divergent beam into parallel light). Therefore, laser beam expanding and collimating technology becomes a key research direction.

[0003] In the prior art, as disclosed in CN222719726U, a laser beam expanding and collimating lens group and a microscopic imaging device are disclosed, which comprises a double-concave lens, a plano-concave lens, a double-convex lens and a plano-convex lens arranged in sequence along the beam propagation path. The laser beam expanding and collimating lens group disclosed in the utility model, through the combination and configuration of the double-concave lens, the plano-concave lens, the double-convex lens and the plano-convex lens, not only can significantly expand the laser beam diameter while maintaining a relatively simple system design, but also can effectively collimate the beam to ensure the uniformity of the laser spot, to meet the application needs of various large-area and high-uniformity laser spots.

[0004] Although the above-mentioned patent can adjust the beam diameter of laser beam through the combination of multiple lenses, it lacks adjustable spacing design, resulting in the need to rely on replacing mounting cylinder or spacer ring for adjusting the spacing between lenses, which cannot dynamically compensate for the offset caused by assembly tolerance or environmental changes, reducing the flexibility and adaptability of the system. It also lacks filtering function, limiting its applicability in multispectral scenarios, and lacks high-precision light path positioning capability. Therefore, a laser collimation lens group is proposed to solve the above problems. UTILITY MODEL CONTENTS

[0005] In order to make up for the deficiencies of the prior art and solve the problems of the laser collimation lens group, the utility model provides a laser collimation lens group.

[0006] The technical solution adopted by the utility model to solve its technical problems is: the laser collimation lens group comprises a double-concave lens, a plano-concave lens, a double-convex lens and a plano-convex lens, characterized in that an adjustable spacing assembly is provided between the double-concave lens and the plano-concave lens, and a filtering assembly is threadedly connected to one end of the adjustable spacing assembly.

[0007] The adjustable spacing assembly comprises mounting barrels sleeved on the surfaces of the double-concave lens, the plano-concave lens, the double-convex lens and the plano-convex lens respectively, the surface of one end of the mounting barrel and the inner wall of the other end are provided with thread grooves, the surface of the mounting barrel is sleeved with an elastic compensation ring, and the inner wall of the mounting barrel is provided with heat expansion compensation rings connected with the double-concave lens, the plano-concave lens, the double-convex lens and the plano-convex lens respectively.

[0008] The filter assembly comprises a mounting plate threadedly connected to the surface of one end of the mounting barrel, the inside of the mounting plate is sleeved with a multi-band filter, and the side surface of the mounting plate is fixedly connected with a photoelectric positioner.

[0009] Preferably, the elastic compensation ring is sleeved on the middle part of the outer surface of the mounting barrel, and the outer diameter of the elastic compensation ring and the threadedly connected end of the adjacent mounting barrel form a gap compensation structure, and the heat expansion compensation rings are arranged in an axial direction of the mounting barrel and are in heat deformation matching connection with the lens seats of the corresponding lenses.

[0010] Preferably, the elastic compensation ring is made of an elastic material and has a wave-shaped structure in cross section, and the thread grooves of the mounting barrel are arranged at a preset distance from the end surface respectively.

[0011] Preferably, the heat expansion compensation rings are made of a material with adjustable heat expansion coefficient, and the inner diameter size of the heat expansion compensation rings is controlled within a preset range in cooperation with the fitting tolerance of the outer diameter of the corresponding lenses.

[0012] Preferably, the multi-band filter comprises a plurality of filter layers of different wave bands, and each filter layer is arranged in a laminated mode in the mounting plate along the optical axis direction.

[0013] Preferably, the photoelectric positioner comprises an infrared positioning module and a laser positioning module, and the bottom of the photoelectric positioner is provided with a signal feedback module connected with the side wall of the mounting plate.

[0014] The utility model discloses the beneficial effect lies in:

[0015] 1. The utility model discloses the mounting barrel double -end thread groove structure design of adjustable spacing assembly, cooperate the wave -shaped cross section structure of elastic compensation ring, realize the dynamic adjustment of double -concave lens and plano -concave lens between air gap and assembly tolerance compensation function, along the axial interval arrangement of heat expansion compensation ring of mounting barrel inner wall, utilize the heat expansion coefficient adjustable material to offset the thermal deformation difference between lens and mounting barrel, promote the optical axis stability of lens group in the temperature change environment,

[0016] 2. The utility model discloses the structure design of the multilayer filter layer structure of the multi -band filter of mounting plate integration, realize the dynamic switching function of multispectral in laser collimation light path, combine the infrared positioning module and laser positioning module of photoelectric positioner and work cooperatively, through signal feedback module real -time calibration filter and the optical axis coaxial degree of lens group, enhance the spectral adaptability and light beam positioning precision of system. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0019] Figure 2 This is a schematic diagram of the adjustable spacing component structure of this utility model;

[0020] Figure 3 This is a schematic diagram of the biconcave lens and biconvex lens structure of this utility model;

[0021] Figure 4 This is a schematic diagram of the filter component structure of this utility model;

[0022] Figure 5 This is a schematic diagram of the disassembled structure of this utility model.

[0023] In the figure: 1. Biconcave lens; 2. Plano-concave lens; 3. Biconvex lens; 4. Plano-convex lens; 5. Adjustable spacing assembly; 51. Mounting cylinder; 52. Elastic compensation ring; 53. Thermal expansion compensation ring; 6. Filter assembly; 61. Mounting plate; 62. Filter; 63. Photoelectric positioner. Detailed Implementation

[0024] 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 scope of protection of the present utility model.

[0025] Please see Figures 1-5As shown, a laser collimation lens group comprises a double-concave lens 1, a plano-concave lens 2, a double-convex lens 3 and a plano-convex lens 4, characterized in that an adjustable spacing assembly 5 is arranged between the double-concave lens 1 and the plano-concave lens 2, and one end of the adjustable spacing assembly 5 is threadedly connected with a filter assembly 6; the adjustable spacing assembly 5 comprises mounting barrels 51 respectively sleeved on the surfaces of the double-concave lens 1, the plano-concave lens 2, the double-convex lens 3 and the plano-convex lens 4, the surface of one end of the mounting barrel 51 and the inner wall of the other end are both provided with thread patterns, the surface of the mounting barrel 51 is sleeved with an elastic compensation ring 52, and the inner wall of the mounting barrel 51 is provided with thermal expansion compensation rings 53 respectively connected with the double-concave lens 1, the plano-concave lens 2, the double-convex lens 3 and the plano-convex lens 4;

[0026] In operation, the spacing between the double-concave lens 1 and the plano-concave lens 2 is adjusted by threadedly connecting the double-end thread patterns of the mounting barrel 51 with the adjacent mounting barrel 51, wherein the wavy cross-sectional structure of the elastic compensation ring 52 is deformed under pressure in the middle part of the outer surface of the mounting barrel 51 to compensate the thread gap, and the thermal expansion compensation rings 53 are axially spaced along the inner wall of the mounting barrel 51 to cover the edges of the lenses, and the adjustable thermal expansion coefficient of the thermal expansion compensation rings 53 enables the lenses to synchronously deform with the mounting barrel 51 when the lenses are heated and expanded, thereby ensuring that the optical axis offset is controlled.

[0027] Further, the filter assembly 6 comprises a mounting plate 61 threadedly connected to the surface of one end of the mounting barrel 51, the inside of the mounting plate 61 is sleeved with a multi-band filter 62, and the side surface of the mounting plate 61 is fixedly connected with a photoelectric positioner 63.

[0028] In operation, the multi-band filter 62 is fixed by threadedly connecting the mounting plate 61 with the end of the mounting barrel 51, each filter layer is stacked in the light transmission hole of the mounting plate 61 along the optical axis direction, the laser positioning module of the photoelectric positioner 63 emits a calibration light beam through the center of the filter 62, the infrared positioning module monitors the light beam offset in real time and drives the mounting plate 61 to adjust the angle through the signal feedback module, thereby realizing the coaxial positioning of the filter 62 and the optical axis of the lens group.

[0029] Further, the elastic compensation ring 52 is sleeved on the middle part of the outer surface of the mounting barrel 51 and its outer diameter forms a gap compensation structure with the threadedly connected end of the adjacent mounting barrel 51, and the thermal expansion compensation rings 53 are axially spaced along the mounting barrel 51 and are connected with the lens seats of the corresponding lenses in a thermal deformation matching mode.

[0030] In operation, the radial deformation ability of the elastic compensation ring 52 absorbs the assembly stress of the mounting cylinder 51 during screwing, and the axial interval arrangement of the thermal expansion compensation ring 53 matches the thermal deformation of the lens holder to synchronously offset the axial displacement of the lens group caused by the temperature gradient; in specific implementation, the elastic compensation ring 52 elastically shrinks under the radial pressure during the screwing process of the mounting cylinder 51 to eliminate the lens eccentricity error caused by the thread gap, and the thermal expansion compensation ring 53 adopts the segmented type to cover the edge of the lens holder, and expands or contracts along the axial direction to compensate the different expansion amounts of the lens and the mounting cylinder 51 when the temperature changes.

[0031] Further, the elastic compensation ring 52 is made of an elastic material and has a wavy cross-section, and the thread patterns of the mounting cylinder 51 are arranged at a preset distance from the end face;

[0032] In operation, the wavy cross-section of the elastic compensation ring 52 enhances the compensation ability for the radial and axial assembly deviations of the mounting cylinder 51 through the multi-directional deformation characteristics, and the thread pattern layout at the preset distance optimizes the screwing stroke control of the mounting cylinder 51; in specific implementation, the wavy cross-section of the elastic compensation ring 52 produces multi-directional elastic deformation to adapt to the connection angle deviation of different mounting cylinders 51 when under pressure, and the thread patterns at the end of the mounting cylinder 51 ensure the controllable screwing depth through the reserved non-thread area to avoid excessive locking and cause stress concentration of the lens.

[0033] Further, the thermal expansion compensation ring 53 is made of a material with adjustable thermal expansion coefficient, and the fitting tolerance between the inner diameter of the thermal expansion compensation ring 53 and the outer diameter of the corresponding lens is controlled within a preset range;

[0034] In operation, the thermal expansion behavior of the lens and the mounting cylinder 51 is actively matched through the material with adjustable thermal expansion coefficient, and the preset tolerance range ensures that the compensation ring 53 forms a stress-free clamping with the lens at room temperature; in specific implementation, the thermal expansion compensation ring 53 adopts a gradient composite material, the inner layer has the same thermal expansion coefficient as the lens material, and the outer layer matches the material of the mounting cylinder 51, and the gap between the inner diameter of the compensation ring 53 and the outer diameter of the lens is controlled at the micron level during installation to ensure smooth assembly and avoid loosening or extrusion caused by thermal expansion and cold contraction.

[0035] Further, the optoelectronic positioner 63 includes an infrared positioning module and a laser positioning module, and the bottom is provided with a signal feedback module connected with the side wall of the mounting plate 61;

[0036] In operation, high-precision dynamic calibration of the optical filter 62 and the lens group optical axis is achieved through cooperative detection of the infrared and laser positioning modules, and the signal feedback module adjusts the spatial posture of the mounting plate 61 in real time to maintain the coaxiality of the optical path; in specific implementation, the laser positioning module projects a cross positioning light spot onto the surface of the optical filter 62, the infrared positioning module generates a calibration signal by receiving the offset of the reflected light spot, and the signal feedback module drives the micro stepping motor at the bottom of the mounting plate 61 to adjust the pitch and yaw angles until the center of the light spot coincides with the lens group optical axis.

[0037] Working principle: the incident laser is received by the double-concave lens 1 and the light beam is initially diverged, then the flat-concave lens 2 further regulates the divergence angle, the light beam is guided by the installation cylinder 51 of the adjustable spacing assembly 5 to the double-convex lens 3 for convergence and collimation, and finally the flat-convex lens 4 completes the optimization of light spot uniformity; the installation cylinder 51 of the adjustable spacing assembly 5 adjusts the spacing of the double-concave lens 1 and the flat-concave lens 2 through double-end screwing, the wave-shaped cross section of the elastic compensation ring 52 absorbs assembly stress during screwing, and the thermal expansion compensation ring 53 synchronously offsets the deformation difference of the lens and the installation cylinder 51 caused by temperature change; the mounting plate 61 of the optical filter assembly 6 is connected with the multi-band optical filter 62 at the end of the optical path through screwing, the laser positioning module of the photoelectric positioner 63 projects a calibration light spot onto the surface of the optical filter 62, the infrared positioning module detects the light spot offset and drives the mounting plate 61 to fine-tune the angle through the signal feedback module, high-precision dynamic coaxial calibration of the optical filter 62 and the lens group optical axis is achieved, and finally a multi-band collimated laser beam is output.

[0038] The preferred embodiments of the utility model are described above only, and are not used for limiting the utility model, although the utility model is described in detail with reference to the foregoing embodiments, for the person skilled in the art, still can modify the technical scheme recorded in foregoing each embodiment, or equivalent replacement to part technical features. Any modification, equivalent replacement, similar improvement etc. that is made within the theory and principle content of the utility model, should be contained in the protection scope of the utility model.

Claims

1. A laser collimating lens assembly, characterized in that: The lens includes a biconcave lens (1), a plano-concave lens (2), a biconvex lens (3), and a plano-convex lens (4), characterized in that an adjustable spacing component (5) is provided between the biconcave lens (1) and the plano-concave lens (2), and a filter component (6) is threadedly connected to one end of the adjustable spacing component (5). The adjustable spacing assembly (5) includes a mounting cylinder (51) that is respectively fitted onto the surfaces of the biconcave lens (1), the plano-concave lens (2), the biconvex lens (3), and the plano-convex lens (4). The surface of one end of the mounting cylinder (51) and the inner wall of the other end are provided with threaded patterns. An elastic compensation ring (52) is fitted onto the surface of the mounting cylinder (51). A thermal expansion compensation ring (53) is provided on the inner wall of the mounting cylinder (51) and is respectively connected to the biconcave lens (1), the plano-concave lens (2), the biconvex lens (3), and the plano-convex lens (4). The filter assembly (6) includes a mounting plate (61) threaded to one end surface of the mounting cylinder (51), a multi-band filter (62) is sleeved inside the mounting plate (61), and a photoelectric positioner (63) is fixedly connected to the side of the mounting plate (61).

2. The laser collimating lens assembly according to claim 1, characterized in that: The elastic compensation ring (52) is sleeved on the middle of the outer surface of the mounting cylinder (51) and its outer diameter forms a gap compensation structure with the threaded connection end of the adjacent mounting cylinder (51). The thermal expansion compensation ring (53) is arranged at intervals along the axial direction of the mounting cylinder (51) and forms a thermal deformation matching connection with the lens mount of the corresponding lens.

3. The laser collimating lens assembly according to claim 1, characterized in that: The elastic compensation ring (52) is made of elastic material and its cross-section has a wave-shaped structure. The threaded pattern of the mounting cylinder (51) is respectively set at a preset distance from the end face.

4. A laser collimating lens assembly according to claim 1, characterized in that: The thermal expansion compensation ring (53) is made of a material with an adjustable coefficient of thermal expansion, and the tolerance between its inner diameter and the corresponding lens outer diameter is controlled within a preset range.

5. A laser collimating lens assembly according to claim 1, characterized in that: The multi-band filter (62) includes multiple filter layers of different bands, and each filter layer is stacked in the mounting plate (61) along the optical axis.

6. A laser collimating lens assembly according to claim 1, characterized in that: The photoelectric locator (63) includes an infrared positioning module and a laser positioning module, and its bottom is provided with a signal feedback module connected to the side wall of the mounting plate (61).

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