CN218728123U

CN218728123U - Light emission mechanism and laser sensor

Info

Publication number: CN218728123U
Application number: CN202222731223.8U
Authority: CN
Inventors: 唐可信; 叶立平
Original assignee: Shenzhen Akusense Technology Co Ltd
Current assignee: Shenzhen Akusense Technology Co Ltd
Priority date: 2022-10-14
Filing date: 2022-10-14
Publication date: 2023-03-24
Anticipated expiration: 2032-10-14

Abstract

The utility model relates to the technical field of optical lens, concretely relates to light emission mechanism and laser sensor, light emission mechanism includes light source, speculum and collimating lens, after the light source sends out the beam through the speculum reflection and shoots to collimating lens, lens gather together the light, along the collimation direction parallel ejection; and a notch is arranged at the axial lead position of the aspheric convex lens for cutting, the aspheric convex lens is divided into two parts, and one part is taken to form the collimating lens. The collimating lens breaks through the conventional technology, the notch is formed in the axial lead position of the aspheric convex lens for cutting, the aspheric convex lens is divided into two parts, and the two parts are taken to form the collimating lens. When the light enters, the light does not pass through the center of the lens, and the emergent light is still collimated and parallel, so that the problem of surface defects caused by difficult processing of a mold on the surface of the lens to facula defects generated after laser penetrates through the glass lens is avoided.

Description

Light emission mechanism and laser sensor

Technical Field

The utility model relates to an optical lens's technical field, concretely relates to light emission mechanism and laser sensor.

Background

Referring to fig. 1, the light source is collimated after passing through the lens system, generally, the light source and the optical lens are on a concentric optical axis, the reflector is inclined at 45 degrees, and the collimated light is also transmitted concentrically with the optical axis. This is a common principle of collimated light paths.

When the optical lens is an aspheric lens, the central parts of the two surfaces of the aspheric lens are difficult to machine to the ideal curvature on the mould due to the defects existing in the mould machining process of the aspheric lens. The reason is as follows: for each point on the part where the "center" diameter r is close to 0, their linear velocity is small, linear velocity = angular velocity x diameter r, and as can be seen from this equation, as long as r is very close to 0, i.e. close to the rotation axis, the linear velocity is close to 0. If the linear velocity is close to 0, the corresponding portion of the die is difficult to machine, and the rotational speed of the cutting process is slow, making the cutting difficult. In practice, the middle part can only be corrected by manual grinding, but the manual grinding cannot achieve good precision.

Due to the above-mentioned defects, when the laser light passes through the optical lens, a bright or dark portion is generated in the center of the screen, and the screen is difficult to be uniform.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a light emission mechanism and laser sensor to solve the problem among the above-mentioned background art.

In order to achieve the above object, the present invention adopts a technical solution of providing a light emitting mechanism, including a light source, a reflector and a collimating lens, wherein the light beam emitted from the light source is reflected by the reflector and emitted to the collimating lens, and the lens emits light beams in parallel along a collimating direction after gathering the light beams; and a notch is arranged at the axial lead position of the aspheric convex lens for cutting, the aspheric convex lens is divided into two parts, and one part is taken to form the collimating lens.

Furthermore, a notch is arranged at the axial lead position of the aspheric convex lens for cutting, the aspheric convex lens is divided into two equal parts, and one of the two equal parts is taken to form the collimating lens; wherein, the distance from the axis of the aspheric convex lens to the edge of the notch is 1-5mm.

Furthermore, the light emitting mechanism of the laser sensor further comprises a light beam plate, wherein a light hole is formed in the light beam plate, and the light beam plate is located between the light source and the reflector.

Furthermore, the light beam plates are multiple, the centers of the light holes in the light beam plates are located on the same straight line, and the areas of the light holes in the light beam plates are sequentially increased in the direction from the light source to the reflecting mirror.

Furthermore, the light holes in the first light beam plate close to the light source are round holes, and the rest of the light holes are square holes.

Further, the reflector is provided with a compensation angle relative to the emission direction of the light source.

Further, this application still provides a laser sensor, including installation shell and light emission mechanism, light emission mechanism is located in the installation shell, light emission mechanism be the aforesaid light emission mechanism.

Furthermore, a mounting frame is arranged in the mounting shell, a positioning groove with a compensation angle is formed in the mounting frame, and the reflector is mounted in the positioning groove.

The utility model discloses a beneficial effect lies in:

1. the collimating lens breaks through the conventional technology, the notch is formed in the axial lead position of the aspheric convex lens for cutting, the aspheric convex lens is divided into two parts, and the two parts are taken to form the collimating lens. When the light enters, the light does not pass through the center of the lens, and the emergent light is still collimated and parallel, so that the problem of surface defects caused by difficult processing of a mold on the surface of the lens to facula defects generated after laser penetrates through the glass lens is avoided.

2. And a notch is arranged at the axial lead position of the aspheric convex lens for cutting, the aspheric convex lens is divided into two equal parts, and one of the two equal parts is taken to form the collimating lens. The two collimating lenses with the same size can be formed by adopting an equal division mode, the parameters are the same, the collimating lenses have the same quantization standard, the collimating lenses can be respectively installed on different emission mechanisms, and at the moment, the curvature of one of the collimating lenses can be measured.

3. Be equipped with the light trap on the beam of light board, the beam of light board carries out the plastic restriction to the light that the light source sent for the light beam that sends satisfies the standard.

4. Because the collimating lens adopts the two parts which are divided into two parts by the aspheric convex lens, the triple prism effect can be caused at the moment, namely the light passing through the collimating lens is refracted and then deviates the direction before the light is refracted, and at the moment, the deviation amount is compensated by the corresponding deflection angle before the light is incident by setting the compensation angle on the reflector, so that the emergent light is collimated light.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the technical solutions in the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

FIG. 1 is a schematic diagram of the path of collimated light in a prior art drawing;

fig. 2 is an overall schematic view of a laser sensor provided in embodiment 2 of the present invention;

fig. 3 is a schematic view of a manufacturing process of a collimating lens used in a light emitting mechanism provided in embodiment 1 of the present invention;

fig. 4 is a comparison diagram before and after angle compensation is performed on the reflector of the transmitting mechanism provided in embodiment 1 of the present invention.

Description of reference numerals:

1. a light source; 2. a mirror; 3. a collimating lens; 4. an aspherical convex lens; 5. a notch; 6. a beam light plate; 61. a light-transmitting hole; 7. a mounting frame; 8. and (5) mounting the shell.

Detailed Description

The technical solution of the present invention will be described clearly and completely with reference to the accompanying drawings, and obviously, the described embodiments are some, but not all embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Furthermore, the technical features mentioned in the different embodiments of the invention described below can be combined with each other as long as they do not conflict with each other.

Example 1

Referring to fig. 2 and 4, the light emitting mechanism provided by the embodiment of the present invention includes a light source 1, a reflector 2 and a collimating lens 3, wherein the light beam emitted from the light source 1 is reflected by the reflector 2 and emitted to the collimating lens 3, and the light beam is converged by the lens and then emitted in parallel along the collimating direction; a notch 5 is formed at the axial center position of the aspherical convex lens 4, and the aspherical convex lens is divided into two parts, and one of the two parts is taken out to form the collimator lens 3.

The collimating lens 3 breaks through the conventional technology, the notch 5 is formed in the axis position of the aspheric convex lens 4 for cutting, the aspheric convex lens is divided into two parts, and the two parts are taken to form the collimating lens 3 in the application. When the light enters, the light does not pass through the center of the lens, and the emergent light is still collimated and parallel, so that the problem of surface defects caused by difficult processing of a mold on the surface of the lens to facula defects generated after laser penetrates through the glass lens is avoided.

Specifically, referring to fig. 3, a notch 5 is cut at the axial center position of the aspherical convex lens 4, and the aspherical convex lens is divided into two equal parts, and one of the two equal parts is taken out to form the collimator lens 3. The two collimating lenses 3 with the same size can be formed by adopting an equal division mode, the parameters are the same, the same quantization standard exists, the collimating lenses can be respectively arranged on different emission mechanisms, and the curvature of one of the collimating lenses can be measured. Wherein, the distance between the axial lead of the aspheric convex lens 4 and the edge of the notch 5 is 1-5mm. The specific cutting amount is affected by the material (Nd refractive index) of the lens, the thickness of the lens and the curvatures of the two surfaces, and the optical design is required to be designed according to actual conditions.

Further, the light emitting mechanism further comprises a light beam plate 6, the light beam plate 6 is provided with a light hole 61, and the light beam plate 6 is located between the light source 1 and the reflector 2. The light beam plate 6 is provided with a light hole 61, and the light beam plate 6 shapes and limits light emitted by the light source 1, so that the emitted light beam meets the standard.

Specifically, referring to fig. 2, the plurality of light-bundling plates 6 are provided, the centers of the light-transmitting holes 61 of the plurality of light-bundling plates 6 are positioned on the same straight line, and the areas of the light-transmitting holes 61 of the plurality of light-bundling plates 6 are sequentially increased from the light source 1 toward the reflector 2. The light holes 61 on the first light beam plate 6 close to the light source 1 are round holes, and the rest of the light holes 61 are square holes, so that light rays meeting emission requirements are shaped.

Further, the reflector 2 is provided with a compensating angle with respect to the emission direction of the light source 1. Because the collimating lens 3 adopts the two parts which are divided into two by the aspheric convex lens 4, the prism effect can be caused at the moment, namely the direction before the refraction of the light passing through the collimating lens 3 is deviated, and the deviation amount is compensated by the corresponding deviation angle before the incidence by setting the compensation angle on the reflector 2, so that the emergent light is the collimated light.

Specifically, taking fig. 4 as an example, when a lens made of a material having a refractive index Nd =1.59, having a thickness T =4mm and an outer diameter =20mm, and having two surfaces as characteristics, and a radius of curvature r1= +23mm and r2= +1000mm, is actually set at an initial position, that is, when the mirror 2 is tilted at 45 °, the outgoing light rays are tilted. After the compensation angle adjustment of 1.5 degrees is carried out, the design is that the angle is inclined by 43.5 degrees as shown in fig. 4, and the collimation and the parallelism of the emergent rays can be satisfied. In this embodiment, the position of speculum 2 is equipped with mounting bracket 7, is equipped with the constant head tank on the mounting bracket 7, according to light source 1, speculum 2 and collimating lens 3's mounted position, according to collimating lens 3's thickness, external diameter, refracting index and curvature radius isoparametric comprehensive calculation reflecting lens's compensation angle, design the specific size structure that corresponds after the compensation angle and set up the constant head tank, speculum 2 direct mount can in the constant head tank.

As a variable embodiment, the mounting frame 7 may not be provided with a positioning groove, and at this time, the mounting frame 7 may be provided with a fixed clamping structure; according to the installation positions of the light source 1, the reflector 2 and the collimating lens 3, the compensation angle of the reflector is comprehensively calculated according to the parameters such as the thickness, the outer diameter, the refractive index and the curvature radius of the collimating lens 3, the position of the reflector 2 is adjusted according to the compensation angle, and then the reflector 2 is fixed through a fixed clamping structure.

Example 2

Referring to fig. 2, a laser sensor provided as an embodiment of the present invention includes a mounting case 8 and a light emitting mechanism, the light emitting mechanism is located in the mounting case 8, and the light emitting mechanism is the light emitting mechanism described in embodiment 1.

Specifically, the mounting position of light source 1, speculum 2, collimating lens 3 and beam light board 6 has been preset to installation shell 8, still is equipped with mounting bracket 7 in installation shell 8, is provided with the constant head tank that is equipped with the compensation angle on the mounting bracket 7, and speculum 2 is installed in the constant head tank. The steps of mounting the light emitting mechanism in this embodiment are as follows:

s10: according to the installation positions of the light source 1, the reflector 2 and the collimating lens 3, comprehensively calculating the compensation angle of the reflecting lens according to the thickness, the outer diameter, the refractive index and the curvature radius of the collimating lens 3;

s20: adjusting the position of the mounting rack 7 according to the calculated compensation angle, so that the position angle of the positioning groove on the mounting rack 7 meets the compensation angle; or directly processing a positioning groove meeting the requirement on the mounting rack according to the calculated compensation angle value;

s30: the light source 1, the reflector 2, the collimating lens 3 and the light beam plate 6 are sequentially arranged, and the collimating lens 3 is arranged in the positioning groove.

In the application, the collimating lens adopted by the light emitting mechanism breaks through the convention, the notch is formed in the axial lead position of the aspheric convex lens for cutting, the aspheric convex lens is divided into two parts, and one part is taken to form the collimating lens in the application. When the light enters, the light does not pass through the center of the lens, and the emergent light is still collimated and parallel, so that the problem of surface defects caused by difficult processing of a mold on the surface of the lens to facula defects generated after laser penetrates through the glass lens is avoided.

As a variable embodiment, the mounting bracket 7 may further adopt a fixed clamping structure, a position space for adjusting the reflector 2 is left at the mounting bracket 7, and after the light source 1, the reflector 2, the collimating lens 3 and the beam splitter 6 are sequentially mounted, the position of the reflector 2 is adjusted according to the calculated compensation angle, so that the reflector 2 is fixed by the mounting bracket after the reflector rotates to the specified compensation angle.

The embodiment of this specific implementation mode is the preferred embodiment of the present invention, not limit according to this the utility model discloses a protection scope, so: all equivalent changes made according to the structure, shape and principle of the utility model should be covered within the protection scope of the utility model.

Claims

1. The light emitting mechanism is characterized by comprising a light source (1), a reflector (2) and a collimating lens (3), wherein light beams emitted by the light source (1) are reflected by the reflector (2) and emitted to the collimating lens (3), and the light beams are converged by the lens and then emitted in parallel along a collimation direction;

and a notch (5) is arranged at the axis position of the aspheric convex lens (4) for cutting, the aspheric convex lens is divided into two parts, and one part is taken to form the collimating lens (3).

2. The light-emitting mechanism according to claim 1, wherein the collimating lens (3) is formed by cutting a notch (5) at a position along the axis of the aspherical convex lens (4) to divide the notch into two equal parts; wherein, the distance between the axial lead of the aspheric convex lens (4) and the edge of the notch (5) is 1-5mm.

3. The light emitting mechanism of claim 1, further comprising a light beam plate (6), wherein the light beam plate (6) is provided with a light transmitting hole (61), and the light beam plate (6) is located between the light source (1) and the reflector (2).

4. The light emitting mechanism according to claim 3, wherein the light beam plate (6) is a plurality of light beam plates, the centers of the light transmission holes (61) on the light beam plates (6) are positioned on the same straight line, and the areas of the light transmission holes (61) on the light beam plates (6) are sequentially increased in the direction from the light source (1) to the reflector (2).

5. The light emitting mechanism according to claim 4, wherein the light holes (61) of the first light beam plate (6) adjacent to the light source (1) are round holes, and the rest of the light holes (61) are square holes.

6. Light emitting mechanism according to claim 1, characterized in that the reflector (2) is provided with a compensating angle with respect to the emitting direction of the light source (1).

7. A laser sensor comprising a mounting housing (8) and a light emitting mechanism located within the mounting housing (8), characterized in that the light emitting mechanism is a light emitting mechanism according to any one of claims 1-6.

8. Laser sensor according to claim 7, characterized in that a mounting frame (7) is provided in the mounting housing (8), that the mounting frame (7) is provided with angle-compensating positioning slots, in which the mirror (2) is mounted.