Optical lens for high-precision laser range finder
By using aspherical lenses and aperture designs with specific optical power in laser rangefinder optical lenses, the problems of imaging quality and cost in the prior art are solved, and high-precision imaging and low distortion effects are achieved.
Patent Information
- Application Number
- CN202422402187.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-30
- Publication Date
- 2025-08-05
- Estimated Expiration
- 2034-09-30
AI Technical Summary
The prior art optical lenses cannot meet the needs of high-precision imaging quality and low cost in triangular laser rangefinders, and there are large distortions.
An aspherical lens and a diaphragm with a specific optical power are arranged between the first lens and the second lens, and the power and surface shape of the lens are reasonably distributed, and the light angle is controlled to reduce the lens diameter and correct aberration.
It is achieved that good imaging quality and small distortions are achieved while reducing costs while satisfying the Sharm principle.
Smart Images
Figure CN223193194U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of optical imaging, in particular to an optical lens for a high-precision laser rangefinder. Background Art
[0002] Triangulation ranging is widely used in industrial measurement, robotic navigation, virtual reality, and other fields, driving the continuous innovation and improvement of related technologies. As application scenarios continue to expand, triangulation rangefinders are also evolving towards miniaturization, intelligence, and high precision. Overall, the development of triangulation laser ranging has been closely tied to advances in laser technology, photoelectric sensors, and microprocessors, while also driven by the demand for a wide range of applications. These factors have collectively contributed to the rapid development and maturity of triangulation ranging technology. However, existing optical lenses cannot achieve both the Sham principle and good image quality, and suffer from high distortion and cost. Utility Model Content
[0003] The purpose of this application is to provide an optical lens for a high-precision laser rangefinder in order to address the technical defects in the prior art.
[0004] The technical solutions adopted to achieve the purpose of this application are:
[0005] An optical lens for a high-precision laser rangefinder, comprising a first lens with positive focal power, an aperture, and a second lens with positive focal power, wherein the aperture is arranged at a position between the first lens and the second lens;
[0006] The first lens and the second lens both include an object-side surface and an image-side surface; the object-side surface of the first lens is convex, and the image-side surface of the first lens is concave; the object-side surface of the second lens is concave, and the image-side surface of the second lens is convex.
[0007] In the above technical solution, the material, refractive index and Abbe number of the first lens and the second lens are the same, the material is glass, the refractive index is 1.8100, and the Abbe number is 40.9929.
[0008] In the above technical solution, the focal length of the first lens is 32.7775 mm; the focal length of the second lens is 19.2806 mm.
[0009] In the above technical solution, the radius of curvature of the object-side surface of the first lens is 5.878 mm, and the radius of curvature of the image-side surface of the first lens is 6.376 mm.
[0010] In the above technical solution, the thickness / surface spacing of the object side of the first lens is 5.878 mm, and the thickness / surface spacing of the image side of the first lens is 2.077 mm.
[0011] In the above technical solution, the radius of curvature of the object-side surface of the second lens is -2.127, and the radius of curvature of the image-side surface of the second lens is -9.677.
[0012] In the above technical solution, the object side thickness / surface spacing of the second lens is 3.786 mm, and the image side thickness / surface spacing of the second lens is 0.875 mm.
[0013] The beneficial effects of the utility model are as follows:
[0014] 1. The optical lens of this utility model adopts an aspherical lens with a specific optical focal length and sets the aperture between the first lens and the second lens, which can effectively control the angle of light entering the lens and reduce the aperture of the lens; at the same time, the focal length of each lens is reasonably controlled, which effectively corrects various aberrations and improves the imaging quality of the lens.
[0015] 2. The optical lens of the present invention rationally distributes the optical power of the two lenses and rationally controls the surface shape of the lenses, so that the optical lens still has good imaging quality while meeting the Sham principle, while having smaller distortion and lower cost. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] In order to more clearly illustrate the technical solutions in the present application or the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.
[0017] Figure 1 This is a schematic structural diagram of the optical lens described in the present utility model.
[0018] Figure 2 This is a field curvature curve and distortion curve diagram of the optical lens described in the present utility model.
[0019] Figure 3 This is a schematic diagram of the relative illumination of the optical lens described in the present invention.
[0020] In the figure: 1-first lens, S1-object-side surface of the first lens, S2-image-side surface of the first lens, 2-aperture stop, S3-object-side surface of the second lens, S4-image-side surface of the second lens, 3-second lens. DETAILED DESCRIPTION
[0021] In order to enable those skilled in the art to better understand the present invention, the technical solution of the present invention is further described below in conjunction with specific embodiments.
[0022] An optical lens for high-precision laser rangefinders, see Figure 1 The optical lens comprises a first lens 1 with positive focal length, an aperture 2, and a second lens 3 with positive focal length. The aperture 2 is positioned between the first lens 1 and the second lens 3 to effectively control the angle of light entering the optical lens and reduce the aperture of the optical lens. The optical centers of the first lens 1 and the second lens 3 are located on the same straight line.
[0023] Both the first lens 1 and the second lens 3 include an object-side surface and an image-side surface. The object-side surface S1 of the first lens 1 is convex, while the image-side surface S2 of the first lens 1 is concave. The object-side surface S3 of the second lens 3 is concave, while the image-side surface S4 of the second lens 3 is convex. The optical lens of this embodiment utilizes two aspherical lenses with specific optical powers. By properly distributing the optical powers of the two lenses and properly controlling the lens surface shapes, the optical lens achieves good imaging quality while meeting the Schaum principle, while also having minimal distortion and low cost.
[0024] The focal length of the first lens 1 is 32.7775mm; the focal length of the second lens 3 is 19.2806mm. The material, refractive index and Abbe number of the first lens 1 and the second lens 3 are the same, wherein the material is glass, the refractive index is 1.8100, and the Abbe number is 40.9929. The radius of curvature of the object side surface S1 of the first lens 1 is 5.878mm, and the thickness / surface spacing is 2.077mm; the radius of curvature of the image side surface S2 of the first lens 1 is 6.376mm, and the thickness / surface spacing is 1.787mm; the radius of curvature of the object side surface S3 of the second lens 3 is -2.127, and the thickness / surface spacing is 3.786mm; the radius of curvature of the image side surface S4 of the second lens 3 is -9.677, and the thickness / surface spacing is 0.875mm.
[0025] The design parameters of the first lens 1 and the second lens 3 are shown in Table 1.
[0026] Table 1 Design parameters of the first lens and the second lens
[0027]
[0028] See also Figure 2 , the field curvature value of the optical lens of the utility model is within ±0.2, and the distortion is within ±0.1%; see Figure 3 From the relative illumination, it can be seen that the illumination within the field of view of the optical lens is greater than 95%. It can be seen that the optical lens has the characteristics of good imaging quality, small distortion and high illumination.
[0029] For ease of explanation, spatial relative terms such as "upper", "lower", "left", and "right" are used in the embodiments to illustrate the relationship between one element or feature shown in the figures and another element or feature. It should be understood that, in addition to the orientation shown in the figures, spatial terms are intended to include different orientations of the device in use or operation. For example, if the device in the figure is inverted, the element described as being "under" other elements or features will be positioned "above" other elements or features. Therefore, the exemplary term "under" can include both upper and lower orientations. The device can be positioned in other ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used here can be interpreted accordingly.
[0030] Moreover, relational terms such as “first” and “second” are merely used to distinguish one component from another having the same name, but do not necessarily require or imply any actual relationship or order between these components.
[0031] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as within the scope of protection of the present invention.
Claims
1. An optical lens for a high-precision laser rangefinder, characterized in that: The optical system comprises a first lens with positive focal power, an aperture and a second lens with positive focal power, wherein the aperture is arranged at a middle position between the first lens and the second lens; The first lens and the second lens both include an object-side surface and an image-side surface; the object-side surface of the first lens is convex, and the image-side surface of the first lens is concave; the object-side surface of the second lens is concave, and the image-side surface of the second lens is convex.
2. The optical lens according to claim 1, wherein: The focal length of the first lens is 32.7775 mm; the focal length of the second lens is 19.2806 mm.
3. The optical lens according to claim 1, wherein: The radius of curvature of the object-side surface of the first lens is 5.878 mm, and the radius of curvature of the image-side surface of the first lens is 6.376 mm.
4. The optical lens according to claim 1, wherein: The thickness / surface spacing of the object-side surface of the first lens is 5.878 mm, and the thickness / surface spacing of the image-side surface of the first lens is 2.077 mm.
5. The optical lens according to claim 1, wherein: The curvature radius of the object-side surface of the second lens is -2.127, and the curvature radius of the image-side surface of the second lens is -9.
677.
6. The optical lens according to claim 1, wherein: The object side thickness / surface spacing of the second lens is 3.786 mm, and the image side thickness / surface spacing of the second lens is 0.875 mm.