CN119986603A

CN119986603A - MINI coaxial movement

Info

Publication number: CN119986603A
Application number: CN202510457445.0A
Authority: CN
Inventors: 孙丛林
Original assignee: Shenzhen Weirui Jingke Electronic Co ltd
Current assignee: Shenzhen Weirui Jingke Electronic Co ltd
Priority date: 2025-04-14
Filing date: 2025-04-14
Publication date: 2025-05-13

Abstract

The application discloses a MINI coaxial movement, which relates to the field of laser ranging and comprises a laser, a reflecting mirror, a transmitting and receiving lens and a receiving assembly, wherein the laser, a small hole area on the reflecting mirror and the transmitting and receiving lens form a transmitting external light path, the transmitting and receiving lens, a non-small hole area on the reflecting mirror and the receiving assembly form a receiving light path, an optical axis of the laser coincides with the optical axis of the transmitting and receiving lens, when the MINI coaxial movement works, a laser transmitting light beam passes through the small hole area on the reflecting mirror to screen emergent light spots through the small hole area on the reflecting mirror, then the transmitting and receiving lens collimates the light spots to form parallel light, the parallel light is emergent to a target object, the light reflected by the surface of the target object is focused through the transmitting and receiving lens and then focused to the receiving assembly through the non-small hole area on the reflecting mirror, and the receiving assembly calculates the distance between the receiving assembly and the target object according to received light signals. The application can realize miniaturized and low-cost ranging.

Description

MINI coaxial movement

Technical Field

The application relates to the field of laser ranging, in particular to a MINI coaxial movement.

Background

In recent years, the laser ranging technology is widely applied to equipment such as automatic driving automobiles, unmanned aerial vehicles, robots, geographical surveys and the like, and the laser ranging technology can be used for rapidly measuring long distances, detecting obstacles and navigating, so that rapid development of industries such as transportation, industrial manufacturing and the like is promoted. However, the current laser ranging technology still has the problems of difficulty in developing and manufacturing cost, system weight and volume and measurement precision. For example, the use of a focusing lens between the mirror and the light source results in increased costs and is disadvantageous for miniaturization, and the use of two mirrors plus a laser shaping device results in increased costs.

Disclosure of Invention

The application aims to provide a MINI coaxial movement, which can realize miniaturization and low-cost ranging.

In order to achieve the above object, the present application provides the following solutions:

The application provides a MINI coaxial movement, which comprises a laser, a reflecting mirror, a transmitting and receiving lens and a receiving assembly, wherein the laser, the reflecting mirror and the transmitting and receiving lens are sequentially arranged, and a small hole is formed in the reflecting mirror;

The laser, the small hole area on the reflecting mirror and the transmitting and receiving lens form an external transmitting light path, and the transmitting and receiving lens, the non-small hole area on the reflecting mirror and the receiving assembly form a receiving light path;

When the laser device works, the laser device emits light beams to pass through the small hole area on the reflecting mirror to screen emergent light spots through the small hole area on the reflecting mirror, then the emergent light spots are collimated through the emitting and receiving lens to form parallel light which is emitted to a target object, the light reflected by the surface of the target object is focused through the emitting and receiving lens and then focused to the receiving assembly through the non-small hole area on the reflecting mirror, and the receiving assembly calculates the distance between the receiving assembly and the target object according to received light signals.

According to the specific embodiment of the application, the MINI coaxial movement has the following technical effects that the optical axis of the laser coincides with the optical axis of the transmitting and receiving lens, the small hole area on the laser and the reflecting mirror form an external transmitting light path, the transmitting and receiving lens, the non-small hole area on the reflecting mirror and the receiving component form a receiving light path, and compared with the off-axis ranging technology, the MINI coaxial movement is provided with only one transmitting and receiving lens, so that the volume of the device can be effectively compressed, and the cost can be reduced. And be provided with the aperture on the speculum, use the aperture to screen the facula that the laser instrument was launched, then can realize collimation effect in whole range of measurement through transmitting and receiving lens, consequently need not to increase the lens again between laser instrument and speculum to laser beam shaping, further saved space and cost, realized miniaturization.

Drawings

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings that are needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

Fig. 1 is a schematic diagram of a MINI coaxial cartridge according to an embodiment of the present application.

FIG. 2 is a schematic diagram of an internal emission optical path according to an embodiment of the present application.

The symbol illustration is 1-laser, 2-reflector, 3-transmitting and receiving lens, 4-filter, 5-photodetector, 6-target object, 7-internal light path reflecting plug.

Detailed Description

The following description of the embodiments of the present application will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present application, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.

The application will be further described in detail with reference to the drawings and detailed description below in order to make the objects, features and advantages of the application more comprehensible.

In an exemplary embodiment, as shown in fig. 1, a MINI coaxial core is provided, which includes a laser 1, a reflecting mirror 2, a transmitting and receiving lens 3 and a receiving assembly, wherein the laser 1, the reflecting mirror 2 and the transmitting and receiving lens 3 are sequentially arranged, and a small hole is formed in the reflecting mirror 2.

The laser 1, the small hole area on the reflector 2 and the transmitting and receiving lens 3 form an external transmitting light path, the optical axis of the laser 1 coincides with the optical axis of the transmitting and receiving lens 3, and the included angle between the optical axis of the reflector 2 and the optical axis of the laser 1 is 45 degrees. In one specific application, the laser 1 is a semiconductor laser.

The transmitting and receiving lens 3, the non-aperture area on the reflecting mirror 2 and the receiving component form a receiving light path, and in one specific application, the receiving component comprises a filter 4 and a photodetector 5 which are arranged in sequence, and the photodetector 5 can be an avalanche photodiode (AVALANCHE PHOTODIODE ‌, APD).

In a specific application, the transmitting and receiving lens 3 is a lens with an aspheric structure, and the focal length and the back focal length of the transmitting and receiving lens 3 are in a preset short focal range, that is, the focal length and the back focal length of the transmitting and receiving lens 3 are smaller, and the distances between the laser 1 and the transmitting and receiving lens 3, and between the transmitting and receiving lens 3 and the avalanche photodiode are effectively limited, so that the purpose of miniaturization can be achieved.

When the laser device works, the laser device 1 emits laser beams to pass through the small hole area on the reflecting mirror 2, so that emergent light spots are screened through the small hole area on the reflecting mirror 2, then collimated through the emitting and receiving lens 3 to form parallel light which is emitted to the target object 6, the light reflected by the surface of the target object 6 is focused through the emitting and receiving lens 3 and then focused to the receiving assembly through the non-small hole area on the reflecting mirror 2, and the receiving assembly calculates the distance between the receiving assembly and the target object 6 according to received optical signals.

In the working process, the small holes on the reflecting mirror 2 are used for screening the direct emergent light spots of the laser 1, and the collimation is carried out in the whole range of measurement through the lens with an aspheric structure, so that the laser beam is not required to be shaped by adding a lens between the laser 1 and the reflecting mirror, and the space and the cost are saved. Meanwhile, the whole movement is compressed by using the short-focus aspheric lens under the condition of meeting the measuring range, so that the requirement of miniaturization is met.

Specifically, the light is focused by the transmitting and receiving lens 3, and then passes through the non-small hole area on the reflecting mirror 2 and the optical filter 4, and is focused on the avalanche photodiode.

In another specific application example, the size and the shape of the small hole on the reflecting mirror 2 are set, and the size of the light spot and the angle of the fast and slow axes of the light beam emitted by the laser 1 reaching the transmitting and receiving lens 3 are adjusted, so that the emergent laser light spot is in a good size and energy distribution in the whole range.

In another specific application example, the MINI coaxial core further comprises an inner light path reflecting plug 7, and in operation, part of light in the light beam emitted by the laser 1 passes through the inner light path reflecting plug 7, passes through the small hole area on the reflecting mirror and is transmitted to the receiving component (specifically, is focused onto the avalanche photodiode, namely, the light detector 5 through the optical filter 4) so as to form an emission inner light path, as shown in fig. 2. The receiving component is used for calculating an internal and external time difference based on the received optical signals corresponding to the internal transmission optical path and the received optical signals corresponding to the received optical path, and then calculating the distance between the receiving component and the target object according to the internal and external time difference. Specifically, the internal and external time differences are multiplied by the speed of light to calculate the distance to the target object.

In summary, the application provides a MINI coaxial movement, which uses a semiconductor laser, a reflecting mirror with a small hole and a transmitting and receiving lens to form a transmitting light path, and the region of the reflecting mirror except the small hole and the transmitting and receiving lens form a receiving light path. The small holes on the reflecting mirror are used for screening the light spots directly emitted by the laser, and the long and short axis light spots of the semiconductor laser tend to be consistent and the divergence angles tend to be consistent by controlling the sizes and the shapes of the holes. Meanwhile, the lens with an aspheric structure is used for collimating the light spots screened by the small holes, so that the light spots are emitted close to parallel light. The application is the smallest movement in the market at present within the same measuring range. Compared with a different-axis system, the application can realize miniaturization and improve measurement precision.

The technical features of the above embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.

The principles and embodiments of the present application have been described herein with reference to specific examples, which are intended to facilitate an understanding of the principles and concepts of the application and are to be varied in scope and detail by persons of ordinary skill in the art based on the teachings herein. In view of the foregoing, this description should not be construed as limiting the application.

Claims

1. A MINI coaxial movement, characterized in that the MINI coaxial movement comprises a laser, a reflector, a transmitting and receiving lens and a receiving assembly; the laser, the reflector and the transmitting and receiving lens are arranged in sequence, and a small hole is arranged on the reflector;

The laser, the pinhole area on the reflector and the transmitting and receiving lens constitute an external transmitting optical path; the transmitting and receiving lens, the non-pinhole area on the reflector and the receiving component constitute a receiving optical path; the optical axis of the laser coincides with the optical axis of the transmitting and receiving lens;

When working, the laser emits a light beam through the pinhole area on the reflector to filter the emitted light spot through the pinhole area on the reflector, and then collimates it through the transmitting and receiving lens to form parallel light that is emitted to the target object; the light reflected from the surface of the target object is focused through the transmitting and receiving lens, and then focused to the receiving component by the non-pinhole area on the reflector; the receiving component calculates the distance to the target object based on the received light signal.

2. The MINI coaxial movement according to claim 1, characterized in that the angle between the optical axis of the reflector and the optical axis of the laser is 45°.

3. The MINI coaxial movement according to claim 1, characterized in that the laser is a semiconductor laser.

4. The MINI coaxial movement according to claim 1, characterized in that the transmitting and receiving lenses are lenses with aspherical structures.

5. The MINI coaxial movement according to claim 1, characterized in that the focal length and back focal length of the transmitting and receiving lenses are both within a preset short focal range.

6 . The MINI coaxial movement according to claim 1 , wherein the receiving component comprises a filter and a light detector arranged in sequence.

7 . The MINI coaxial movement according to claim 6 , wherein the light detector is an avalanche photodiode.

8. The MINI coaxial movement according to claim 1, characterized in that the MINI coaxial movement further comprises an inner light path reflective plug;

When working, part of the light beam emitted by the laser passes through the inner light path reflective plug, through the small hole area on the reflector and is transmitted to the receiving component to form an emission inner light path;

The receiving component is used to calculate the internal and external time difference based on the received light signal corresponding to the transmitting internal light path and the received light signal corresponding to the receiving light path, and then calculate the distance to the target object according to the internal and external time difference.

9. The MINI coaxial movement according to claim 1 is characterized in that the spot size of the light beam emitted by the laser reaching the transmitting and receiving lens and the angle of the fast and slow axes are adjusted by setting the size and shape of the small hole on the reflector.