High-precision laser range finder
By adopting two aspherical lenses with specific power and narrowband filter designs, the technical difficulties of existing laser rangefinders in miniaturization and high precision are solved, and the imaging quality and cost balance of high-precision laser rangefinders are achieved.
Patent Information
- Application Number
- CN202422402572.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-30
- Publication Date
- 2025-09-02
- Estimated Expiration
- 2034-09-30
AI Technical Summary
The existing triangular laser rangefinder has technical difficulties in miniaturization and high precision, especially in optical lens design, which is difficult to take into account both imaging quality, distortion and cost.
Two aspherical lens designs with specific power are used to reasonably allocate the optical lens’s power, and narrowband filters and silver-plated mirrors are used to reduce the number of optical components to improve accuracy and imaging quality.
It realizes that the optical lens has good imaging quality, small distortion and low cost without reducing sensor accuracy, and is suitable for miniaturized laser rangefinders.
Smart Images
Figure CN223296148U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of optical imaging, in particular to a high-precision laser rangefinder. Background Art
[0002] Triangulation ranging is widely used in fields such as industrial measurement, robotic navigation, and virtual reality, 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 widespread application needs. These factors have collectively contributed to the rapid development and maturity of triangulation ranging technology. Utility Model Content
[0003] The purpose of this application is to provide a high-precision laser rangefinder to address the technical defects in the prior art.
[0004] The technical solutions adopted to achieve the purpose of this application are:
[0005] A high-precision laser rangefinder comprises a rangefinder housing, wherein a laser diode, a laser focusing lens, a narrow-band filter, a reflector, a linear array sensor and an optical lens assembly are arranged in the rangefinder housing;
[0006] The laser focusing lens is arranged at the bottom of the laser diode, the narrow-band filter is arranged at the bottom of the laser focusing lens, the linear array sensor is arranged at one side of the optical lens, and the reflector is arranged at the top of the optical lens;
[0007] The optical lens assembly includes a first lens, an aperture, and a second lens, wherein the aperture is arranged in the 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.
[0008] In the above technical solution, the laser diode is a red laser diode with a wavelength of 658 nm.
[0009] In the above technical solution, the narrowband filter is a narrowband filter with a central wavelength of 658 nm.
[0010] In the above technical solution, the reflector is a silver-plated reflector.
[0011] In the above technical solution, both the first lens and the second lens are aspherical lenses with positive focal length.
[0012] 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.
[0013] In the above technical solution, the material, refractive index and Abbe number of the first lens and the second lens are the same, wherein the material is glass, the refractive index is 1.8100, and the Abbe number is 40.9929.
[0014] In the above technical solution, the curvature radius of the object-side surface of the first lens is 5.878 mm, and the curvature radius of the image-side surface of the first lens is 6.376 mm.
[0015] In the above technical solution, 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.
[0016] The beneficial effects of the utility model are as follows:
[0017] 1. The high-precision laser rangefinder of the utility model is easy to debug without reducing the accuracy of the sensor and uses fewer optical elements.
[0018] 2. The optical lens of the present invention adopts two aspherical lenses with specific optical power. By reasonably distributing the optical power of the two lenses and reasonably controlling the surface shape of the lenses, the optical lens can still have good imaging quality while meeting the Sham principle, while having smaller distortion and lower cost. BRIEF DESCRIPTION OF THE DRAWINGS
[0019] 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.
[0020] Figure 1 This is a structural schematic diagram of the high-precision laser rangefinder described in the utility model.
[0021] In the figure: 1-rangefinder housing, 2-laser diode, 3-laser focusing lens, 4-narrowband filter, 5-reflector, 6-line array sensor, 7-optical lens assembly, 7.1-first lens, 7.2-aperture, 7.3-second lens. DETAILED DESCRIPTION
[0022] 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.
[0023] A high-precision laser rangefinder, see Figure 1 , including a rangefinder housing 1.
[0024] The rangefinder housing 1 is provided with a laser diode 2, a laser focusing lens 3, a narrowband filter 4, a reflector 5, a linear array sensor 6 and an optical lens assembly 7. The laser diode 2 is a red laser diode with a wavelength of 658 nm.
[0025] The laser focusing lens 3 is arranged at the bottom of the laser diode 2, and is used to use the laser diode 2 to emit a laser beam, collect the laser beam through the laser focusing lens 3, and focus the laser beam with a larger divergence angle into a smaller laser light spot; the narrowband filter 4 is arranged at the bottom of the laser diode 2 and the laser focusing lens 3, and is used to ensure that the light emitted by the laser diode 2 and the laser focusing lens 3 can pass smoothly, intercept the light emitted by non-laser diodes 2, and focus the light that passes smoothly on the target; then, the light focused on the target is reflected again through the narrowband filter 4 to the optical lens assembly 7, and the optical lens assembly 7 is used to perform imaging according to the optical path design.
[0026] Preferably, the narrowband filter 4 is a narrowband filter with a central wavelength of 658 nm.
[0027] The line array sensor 6 is disposed on one side of the optical lens assembly 7, and the reflector 5 is disposed on top of the optical lens assembly 7. The reflector 5 transmits the image of the optical lens assembly 7 to the line array sensor 6 via the reflector 5, and the line array sensor 6 converts the reflected light signal into an electrical signal to achieve distance measurement. Specifically, the reflector 5 is a silver-plated reflector with high reflectivity and a high-precision surface shape, which can ensure the accuracy of the laser rangefinder. The use of the reflector can also effectively reduce the volume of the optical path.
[0028] Furthermore, the optical lens assembly 7 includes a first lens 7.1, an aperture 7.2, and a second lens 7.3. The aperture 7.2 is positioned between the first lens 7.1 and the second lens 7.3 to effectively control the angle of light entering the optical lens assembly and reduce the aperture of the optical lens. Both the first lens 7.1 and the second lens 7.3 are aspherical lenses with positive focal lengths.
[0029] The first lens 7.1 and the second lens 7.3 both include an object-side surface and an image-side surface; the object-side surface of the first lens 7.1 is convex, and the image-side surface of the first lens 7.1 is concave; the object-side surface of the second lens 7.3 is concave, and the image-side surface of the second lens 7.3 is convex. The optical lens assembly of this embodiment utilizes two aspherical lenses with specific optical powers. By properly allocating 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.
[0030] Preferably, in this embodiment, the focal length of the first lens 7.1 is 32.7775 mm; the focal length of the second lens 7.3 is 19.2806 mm. The material, refractive index and Abbe number of the first lens 7.1 and the second lens 7.3 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 of the first lens 7.1 is 5.878 mm, and the thickness / surface spacing is 2.077 mm; the radius of curvature of the image side surface of the first lens 7.1 is 6.376 mm, and the thickness / surface spacing is 1.787 mm; the radius of curvature of the object side surface of the second lens 7.3 is -2.127, and the thickness / surface spacing is 3.786 mm; the radius of curvature of the image side surface of the second lens 7.3 is -9.677, and the thickness / surface spacing is 0.875 mm.
[0031] 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.
[0032] 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.
[0033] 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. A high-precision laser rangefinder, characterized by: The rangefinder comprises a housing in which a laser diode, a laser focusing lens, a narrow-band filter, a reflector, a linear array sensor and an optical lens assembly are arranged; The laser focusing lens is arranged at the bottom of the laser diode, the narrow-band filter is arranged at the bottom of the laser focusing lens, the linear array sensor is arranged at one side of the optical lens, and the reflector is arranged at the top of the optical lens; The optical lens assembly includes a first lens, an aperture, and a second lens, wherein the aperture is arranged in the 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 high-precision laser rangefinder according to claim 1, characterized in that: The laser diode is a red laser diode with a wavelength of 658 nm.
3. The high-precision laser rangefinder according to claim 1, characterized in that: The narrowband filter is a narrowband filter with a central wavelength of 658 nm.
4. The high-precision laser rangefinder according to claim 1, characterized in that: The reflector is a silver-plated reflector.
5. The high-precision laser rangefinder according to claim 1, characterized in that: The first lens and the second lens are both aspherical lenses with positive focal length.
6. The high-precision laser rangefinder according to claim 1, characterized in that: The focal length of the first lens is 32.7775 mm; the focal length of the second lens is 19.2806 mm.
7. The high-precision laser rangefinder according to claim 1, characterized in that: The material, refractive index and Abbe number of the first lens and the second lens are the same, wherein the material is glass, the refractive index is 1.8100, and the Abbe number is 40.9929.
8. The high-precision laser rangefinder according to claim 1, characterized in that: The object-side surface of the first lens has a curvature radius of 5.878 mm, and the image-side surface of the first lens has a curvature radius of 6.376 mm.
9. The high-precision laser rangefinder according to claim 1, characterized in that: The object-side surface of the second lens has a curvature radius of -2.127, and the image-side surface of the second lens has a curvature radius of -9.677.