Laser point generation device and generation method

Abstract

The invention discloses a device and method for generating a laser point, and relates to the technical field of laser marking positioning, comprising: a laser light source, a focusing mirror, a reflector slit, and a collimating mirror; the focusing mirror and the collimating mirror are respectively arranged on one side of the incident surface and the exit surface of the reflector slit; the focal plane of the collimating mirror coincides with the incident surface of the reflector slit, the main optical axis of the collimating mirror is coaxial with the straight common edge of the reflector slit, the focus of the focusing mirror is located on the incident surface of the reflector slit, and on the angular bisector of the angle of the reflector slit edge at the incident surface. The existing equipment for generating discrete laser points distributed along an arc has the defects of complex structure and high heat generation. The device and method for generating a laser point described in the technical solution have fixed internal optical elements, simple and reliable structure, insensitive to vibration and temperature, and can be better applied to industrial environments.

Description

Technical Field

[0001] The present invention relates to the technical field of laser marking positioning, and more specifically, to a laser point generating device and a generating method. Background Art

[0002] Visible lasers are widely used for marking and positioning in industrial production. For example, cross-shaped laser patterns are commonly used for alignment and positioning in interior decoration; straight-line lasers are often used for cutting and guiding cloth and paper; and dot lasers are generally used for directional guidance in engineering projects, such as tunnel excavation and railroad track laying.

[0003] The output of the laser is generally a collimated beam, which can be transformed into a straight line, a cross, an array and other shapes through a specific lens group. However, in specific engineering applications, an array of laser light spots is required that is evenly arranged at equal angles on an arc. For example, in the process of coal mine tunnel excavation: the excavation face is generally arch-shaped, consisting of two parts: the upper semicircle and the lower rectangle. Each time the excavation face advances, workers need to evenly distribute explosives on the periphery of the semicircular part. The spacing between the explosives is carefully designed based on the effectiveness of the explosives, rock and soil conditions and other factors. When the explosives are placed at a specific spacing, production efficiency can be optimized. Conventional marking methods are difficult to implement during underground construction, and laser marking is the best choice.

[0004] The prior art uses a scanning galvanometer and a laser to produce laser points evenly distributed in a circular arc, and uses programming and time-sharing to generate multiple target light spots. Specifically, the galvanometer projects the laser beam to a distant imaging surface at a certain moment to generate target light spot No. 1, and then the galvanometer quickly rotates to the next position, and uses the emitted laser to generate target light spot No. 2, and so on. However, in order to visually generate multiple target light spots evenly distributed in equiangular circular arcs at the same time, the galvanometer needs to move quickly. Not only is the motion control mechanism complex, the target light spots have ghosting, and they cannot work for a long time in the high-temperature environment underground. In another scheme of the prior art, an ordinary projector is used to project the pattern, but the light intensity of the projector is too low when working at a long distance, and the resolution is not high, the target light spot is easily blurred, and there are also defects such as complex structure and high heat generation, and it cannot be used for a long time in the high-temperature environment underground.

[0005] The publication number is CN208688495U, and the publication date is 2019-04-02. A flameproof laser pointer for mining is proposed. By switching lenses with different focal lengths, the size of the laser spot can be adjusted. However, the laser pointer cannot generate discrete target light spots evenly distributed along the arc. Summary of the invention

[0006] The present invention provides a laser point generation device and method to overcome the defects of the above-mentioned prior art that the discrete target light spots evenly distributed along the arc cannot be generated, and the existing equipment for generating discrete target light spots distributed along the arc has a complex structure and high heat generation.

[0007] In order to solve the above technical problems, the technical solution of the present invention is as follows:

[0008] A laser point generating device comprises: a laser light source, a focusing mirror, a reflector slit, and a collimating mirror;

[0009] The reflector slit is composed of a first plane reflector and a second plane reflector, the reflective surfaces of the two plane reflectors are arranged opposite to each other, each plane reflector includes a straight edge, the two straight edges of the two plane reflectors are closely attached to the same straight common edge, the two plane reflectors form an acute angle structure in which the reflective surfaces are opposite to each other, one end of the reflector slit in the direction of the straight common edge is the incident surface, and the other end is the exit surface;

[0010] The focusing mirror is arranged on one side of the incident surface of the reflector slit, the collimating mirror is arranged on one side of the exit surface of the reflector slit, the focal plane of the collimating mirror coincides with the incident surface of the reflector slit, the main optical axis of the collimating mirror is coaxial with the straight common edge of the reflector slit, and the focus of the focusing mirror is located on the incident surface of the reflector slit;

[0011] The laser light source emits a collimated laser, the direction of which is parallel to the main optical axis of the focusing mirror. The collimated laser passes through the focusing mirror to obtain a focused laser point a, which is located at the incident surface of the reflector slit. The outgoing light of the focused laser point a is reflected by the first plane reflector and the second plane reflector in the reflector slit to form a plurality of mirror images of the focused laser point a. The collimator simultaneously images the focused laser point a and its mirror image, and projects the focused laser point a onto a working surface to form a target light spot array arranged along an arc, a semicircle, or a full circle.

[0012] In the technical solution, the reflecting surfaces of the two plane reflectors are arranged opposite to each other to form a reflector slit. The collimated laser reaches the incident surface of the reflector slit through the focusing lens, and enters the collimating lens after passing through the reflector slit to obtain an emergent laser with an arc distribution. The present invention provides a laser point generation device and generation method. By adjusting the numerical aperture of the focusing lens, the incident angle of the collimated laser, and the angle of the reflector slit, the number and position of the light spots are adjusted. The internal optical elements are fixedly arranged, and the internal components do not need to move when the equipment is working. The structure is simple and reliable, and is insensitive to vibration and temperature, and can be better applied to industrial environments.

[0013] Furthermore, the plane reflector is an aluminum-plated reflector.

[0014] Furthermore, the focused laser point a is located on the bisector of the angle of the edge of the slit of the reflector at the incident surface.

[0015] Furthermore, the collimator is a double-cemented achromatic lens.

[0016] Furthermore, the focusing lens is an aspherical lens.

[0017] Furthermore, the laser light source is a red diode laser module, and the laser light source outputs collimated laser.

[0018] Furthermore, the reflection areas of the first plane reflecting mirror and the second plane reflecting mirror constituting the reflecting mirror slit are equal.

[0019] A method for generating a laser point comprises the following steps:

[0020] S1, adjusting the numerical aperture NA of the focusing mirror, the incident angle θ of the laser light source, and the slit length L of the reflector slit;

[0021] S2, start the laser light source to emit collimated laser;

[0022] S3, the collimated laser passes through a focusing mirror to obtain a focused laser point a, and the focused laser point a is located at the incident surface of the slit of the reflector;

[0023] S4, the outgoing light of the focused laser point a is reflected by the first plane reflector and the second plane reflector of the reflector slit to form a plurality of mirror images of the focused laser point a;

[0024] S5. The collimator simultaneously images the focused laser point a and its mirror image, and projects the focused laser point a onto the working surface to form a target light spot array arranged along an arc, a semicircle, or a full circle.

[0025] Further, in step S4, the outgoing light of the focused laser point a is reflected in the first plane reflector and the second plane reflector of the reflector slit to form a plurality of mirror images of the focused laser point a. The focused laser point a and the plurality of mirror images are arranged in a circle with the vertex of the angle of the reflector slit as the center. Specifically, the formation process of the plurality of mirror images is as follows:

[0026] The reflector slit is composed of a first plane reflector and a second plane reflector; the focused laser point a is located on the incident surface; the focused laser point a is imaged as point a1 after being reflected by the first plane reflector; the focused laser point a is imaged as point a2 after being reflected by the second plane reflector; point a1 is reflected by the second plane reflector and imaged as a12; point a2 is reflected by the first plane reflector and imaged as a21; and so on.

[0027] Furthermore, in step S3, the focused laser point a is located on the angular bisector of the angle of the edge of the reflector slit at the incident surface; by setting the focused laser point a on the angular bisector, the intervals between the laser points on the working surface are evenly distributed at equal angles; by adjusting the angle of the reflector slit, the distribution angle of the laser point intervals on the working surface is changed.

[0028] Compared with the prior art, the beneficial effects of the technical solution of the present invention are as follows: the reflecting surfaces of the two plane reflectors are arranged opposite to each other to form a reflector slit, the collimated laser reaches the incident surface of the reflector slit through the focusing mirror, and enters the collimating mirror after passing through the reflector slit to obtain an output laser with an arc distribution. The present invention provides a laser point generation device and generation method, which adjusts the number and position of target light spots by adjusting the numerical aperture of the focusing mirror, the incident angle of the collimated laser, and the angle of the reflector slit. The internal optical elements are fixedly arranged, and the internal components do not need to move when the equipment is working. The structure is simple and reliable, and is insensitive to vibration and temperature, and can be better applied to industrial environments. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a schematic diagram of the structure of a laser point generating device and generating method;

[0030] Figure 2 It is a ZY plane projection diagram of a laser point generation device and generation method;

[0031] Figure 3 Schematic diagram of the incident surface of the slit of the reflector;

[0032] Among them: 1. focusing mirror; 2. reflecting mirror slit; 21. first plane reflecting mirror; 22. second plane reflecting mirror; 3. collimating mirror; 4. incident surface; 5. exit surface. DETAILED DESCRIPTION

[0033] The drawings are for illustrative purposes only and should not be construed as limiting the present patent;

[0034] In order to better illustrate the present embodiment, some parts in the drawings may be omitted, enlarged or reduced, and do not represent the size of the actual product;

[0035] It is understandable to those skilled in the art that some well-known structures and their descriptions may be omitted in the drawings.

[0036] The technical solution of the present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0037] Example 1

[0038] The structure of a laser point generating device and a generating method of the present embodiment is as follows Figure 1As shown, it includes: a laser light source, a focusing mirror 1, a reflector slit 2, and a collimating mirror 3; the reflector slit 2 is composed of a first plane reflector 21 and a second plane reflector 22, the reflective surfaces of the two plane reflectors are arranged opposite to each other, each plane reflector includes a straight edge, the two straight edges of the two plane reflectors are closely attached to the same straight common edge, and the two plane reflectors form an acute angle structure in which the reflective surfaces are opposite to each other, and one end of the reflector slit 2 in the direction of the straight common edge is an incident surface 4, and the other end is an exit surface 5;

[0039] The focusing mirror 1 is arranged on one side of the incident surface 4 of the reflector slit 2, the collimating mirror 3 is arranged on one side of the exit surface 5 of the reflector slit 2, the focal plane of the collimating mirror 3 coincides with the incident surface 4 of the reflector slit 2, the main optical axis of the collimating mirror 3 is coaxial with the straight common edge of the reflector slit 2, and the focus of the focusing mirror 1 is located on the incident surface 4 of the reflector slit 2 and on the angular bisector of the edge angle of the reflector slit 2 at the incident surface 4.

[0040] The ZY plane projection of a laser point generating device in this embodiment is as follows: Figure 2 As shown, the laser light source emits a collimated laser, the direction of which is parallel to the main optical axis of the focusing mirror 1. The collimated laser passes through the focusing mirror 1 to form a focused laser point a on the incident surface 4, and in this embodiment, the focused laser point a is located on the angular bisector of the edge angle of the reflector slit 2 at the incident surface 4.

[0041] Taking the focused laser point a as the object point, the outgoing light of the focused laser point a is reflected by the first plane reflector 21 and the second plane reflector 22 in the reflector slit 2 to form a plurality of mirror images of the focused laser point a. The focused laser point a and the plurality of mirror images are arranged in a circle with the vertex of the reflector slit 2 as the center, and are all located on the incident surface 4, which is also the focal plane of the collimator 3. Figure 2 As shown, the focal length of the collimator 3 is f3, and the distance between the collimator 3 and the incident surface 4 is f3.

[0042] The collimator 3 simultaneously images the focused laser point a and its mirror image, and projects the target light spot onto a distant working surface, forming an array of target light spots arranged along an arc, a semicircle or a full circle on the working surface.

[0043] The XY plane projection of the incident surface 4 of the reflector slit 2 is as follows Figure 3As shown. The reflector slit 2 consists of a first plane reflector 21 and a second plane reflector 22. The focused laser point a is located on the incident surface 4. The focused laser point a is imaged as point a1 after being reflected by the first plane reflector 21; the focused laser point a is imaged as point a2 after being reflected by the second plane reflector 22; point a1 is then reflected by the second plane reflector 22 and imaged as a12; point a2 is reflected by the first plane reflector 21 and imaged as a21; and so on. The angle from point a to the first plane reflector 21 is α, and the angle to the second plane reflector 22 is β. It can be obtained that the angle from a to a1 is 2α, and the angle from a to a2 is 2β. To make the target light spots uniformly distributed at equal angles, the position of point a should be adjusted so that α=β, that is, the focused laser point a is located on the angular bisector of the angle of the edge of the reflector slit 2 at the incident surface 4, and at this time the distribution angle of all target light spots is 2α.

[0044] It should be noted that not all mirror points will be projected by the collimator 3. The reason is that when the light propagates in the reflector slit 2, there may not be a real path of a certain mirror, or in other words: the light of this image point cannot reach the exit aperture of the reflector slit 2, so the exit laser forms a target light spot array arranged along an arc, a semicircle or a full circle on the working surface.

[0045] The visibility analysis of the image point is as follows: the laser forms a focused laser point a on the incident surface 4 of the reflector slit 2. When it reaches the exit surface 5, it has propagated in the z-axis direction and diffused into a light spot spa. The shape and position of spa can be calculated by the numerical aperture NA of the focusing mirror 1, the incident angle θ of the laser light source and other parameters, which will not be repeated here. The exit aperture of the system is the same as the entrance aperture, which is the angle between the first plane reflector 21 and the second plane reflector 22. Due to the limitation of the exit aperture, the actual exit light that can be realized is the part of spa located in the middle of the angle between the first plane reflector 21 and the second plane reflector 22. Similarly, the light spot of the mirror image a12 on the exit surface 5 is spa12. Since a12 is rotationally symmetric with a, spa and spa12 are also rotationally symmetric. The exit light where a12 can exist is also the part of spa12 in the middle of the angle between the first plane reflector 21 and the second plane reflector 22. Further, spa21, spa1212, spa2121, etc. can be drawn, and analysis shows that: in this embodiment, the light spots of the mirror images a1212, a21212 to a2121 do not intersect with the angles of the first plane reflector 21 and the second plane reflector 22, so the light of these mirror images cannot be emitted from the exit aperture and cannot be projected. The final imaging of the system is 7 target light spots distributed at equal angles on the semicircular arc. If the above-mentioned target light spots that do not appear are to be presented, the numerical aperture NA of the focusing mirror 1, the incident angle θ of the laser light source, the slit length L of the reflector slit 2 and other parameters should be adjusted to adjust the size and position of the light spot spa on the exit surface. Only when a certain mirror image of spa, such as spaX, intersects with the exit aperture, the corresponding light spot aX is visible. This analysis method is used to adjust the visibility of the target light spot so that the system can generate an array of target light spots arranged on an arc, a semicircle, and even a full circle as needed.

[0046] In this embodiment, the two plane reflectors of the reflector slit 2 are rectangular with the same size; both plane reflectors are aluminum-plated reflectors; the collimating mirror 3 is a double-glued achromatic lens with a diameter of 25.4 mm and a focal length of 50 mm; the focusing mirror 1 is an aspherical lens with a diameter of 9 mm and a focal length of 12 mm; the laser light source is a 100 mW red diode laser module, and the laser light source outputs a collimated laser with a diameter of 8 mm.

[0047] The first plane reflector and the second plane reflector of the reflector slit 2 can be individually and precisely adjusted to adjust the angle of the reflector slit 2, and the angle also determines the distribution angle and the number of target light spots. Using the optical element parameters of this embodiment, the final system achieves the projection of target light spots evenly distributed on a semicircle with a diameter of 5m at a distance of 20m. The number of target light spots can be adjusted from 10 to 50, and the distribution angle can be adjusted from 3.6 degrees to 18 degrees.

[0048] Example 2

[0049] This embodiment provides a method for generating a laser point, the method comprising the steps of:

[0050] S1, adjusting the numerical aperture NA of the focusing mirror 1, the incident angle θ of the laser light source, and the slit length L of the reflecting mirror slit 2;

[0051] S2, start the laser light source to emit collimated laser;

[0052] S3, the collimated laser passes through the focusing mirror 1 to obtain a focused laser point a, and the focused laser point a is located at the incident surface 4 of the reflector slit 2;

[0053] The focused laser point a is located on the angle bisector of the angle of the edge of the reflector slit 2 at the incident surface 4; by arranging the focused laser point a on the angle bisector, the intervals between the target light spots on the working surface are uniformly distributed at equal angles;

[0054] S4, the outgoing light of the focused laser point a is reflected by the first plane reflector 21 and the second plane reflector 22 of the reflector slit 2 to form a plurality of mirror images of the focused laser point a;

[0055] The outgoing light of the focused laser point a is reflected in the reflector slit 2 to form multiple mirror images of the focused laser point a. The focused laser point a and the multiple mirror images are arranged in a circle with the vertex of the angle of the reflector slit 2 as the center. Specifically, the formation process of the multiple mirror images is as follows:

[0056] The reflector slit 2 is composed of a first plane reflector 21 and a second plane reflector 22; the focused laser point a is located on the incident surface 4; the focused laser point a is imaged as point a1 after being reflected by the first plane reflector 21; the focused laser point a is imaged as point a2 after being reflected by the second plane reflector 22; point a1 is then reflected by the second plane reflector 22 to form an image of a12; point a2 is reflected by the first plane reflector 21 to form an image of a21; and so on.

[0057] S5. The collimator 3 simultaneously images the focused laser point a and its mirror image, and projects the focused laser point a onto the working surface to form a target light spot array arranged along an arc, a semicircle, or a full circle.

[0058] By adjusting the included angle of the reflector slit 2, the distribution angle of the target light spot interval on the working surface can be changed.

[0059] The laser point generating device described in the present invention has internal optical elements fixedly arranged, and the internal components do not need to move when the device is working. The structure is simple and reliable, and it is insensitive to vibration and temperature, so it can be better applied to industrial environments.

[0060] The same or similar reference numerals correspond to the same or similar components.

[0061] The terms used in the drawings to describe positional relationships are only used for illustrative purposes and should not be construed as limiting this patent;

[0062] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the embodiments here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. A laser point generating device, characterized in that: include: Laser light source, focusing mirror (1), reflecting mirror slit (2), collimating mirror (3); The reflector slit (2) is composed of a first plane reflector (21) and a second plane reflector (22); the reflective surfaces of the two plane reflectors are arranged opposite to each other; each plane reflector includes a straight edge; the two straight edges of the two plane reflectors are closely attached to the same straight common edge; the two plane reflectors form an acute angle structure in which the reflective surfaces are opposite to each other; one end of the reflector slit (2) in the direction of the straight common edge is an incident surface (4), and the other end is an exit surface (5); the reflective areas of the first plane reflector (21) and the second plane reflector (22) constituting the reflector slit (2) are equal; The focusing mirror (1) is arranged on one side of the incident surface (4) of the reflector slit (2), the collimating mirror (3) is arranged on one side of the exit surface (5) of the reflector slit (2), the focal plane of the collimating mirror (3) coincides with the incident surface (4) of the reflector slit (2), the main optical axis of the collimating mirror (3) is coaxial with the straight common edge of the reflector slit (2), and the focal point of the focusing mirror (1) is located on the incident surface (4) of the reflector slit (2); The laser light source emits a collimated laser, the direction of the collimated laser is parallel to the main optical axis of the focusing mirror (1), the collimated laser passes through the focusing mirror (1) to obtain a focused laser point a, the focused laser point a is located at the incident surface (4) of the reflector slit (2), the outgoing light of the focused laser point a is reflected by the first plane reflector (21) and the second plane reflector (22) in the reflector slit (2), so as to form a plurality of mirror images of the focused laser point a, the collimator (3) simultaneously images the focused laser point a and its mirror image, and projects the focused laser point a onto a working surface to form a target light point array arranged along an arc, a semicircle or a full circle; The plane reflector is an aluminum-plated reflector; the collimating mirror (3) is a double-glued achromatic lens; and the focusing mirror (1) is an aspherical lens.

2. A laser spot generating device according to claim 1, characterized in that: The focused laser point a is located on the bisector of the angle of the edge of the reflector slit (2) at the incident surface (4).

3. The laser spot generating device according to claim 1, characterized in that: The laser light source is a red diode laser module, and the laser light source outputs collimated laser light.

4. A method for generating a laser point, characterized in that: The steps include: S1, adjusting the numerical aperture NA of the focusing mirror (1), the incident angle θ of the laser light source, and the slit length L of the reflector slit (2); S2, start the laser light source to emit collimated laser; S3, the collimated laser light passes through a focusing mirror (1) to obtain a focused laser point a, wherein the focused laser point a is located at an incident surface (4) of the reflector slit (2); S4, the outgoing light of the focused laser point a is reflected by the first plane reflector (21) and the second plane reflector (22) of the reflector slit (2) to form a plurality of mirror images of the focused laser point a; S5. The collimator (3) simultaneously images the focused laser point a and its mirror image, and projects the focused laser point a onto the working surface to form a target light spot array arranged along an arc, a semicircle, or a full circle.

5. A method for generating a laser point according to claim 4, characterized in that: In step S4, the outgoing light of the focused laser point a is reflected in the first plane reflector (21) and the second plane reflector (22) of the reflector slit (2) to form a plurality of mirror images of the focused laser point a. The focused laser point a and the plurality of mirror images are arranged in a circle with the vertex of the angle of the reflector slit (2) as the center. Specifically, the formation process of the plurality of mirror images is as follows: The reflector slit (2) is composed of a first plane reflector (21) and a second plane reflector (22); the focused laser point a is located on the incident surface (4); the focused laser point a is imaged as point a1 after being reflected by the first plane reflector (21); the focused laser point a is imaged as point a2 after being reflected by the second plane reflector (22); point a1 is then reflected by the second plane reflector (22) to form an image a12; point a2 is reflected by the first plane reflector (21) to form an image a21; and so on.

6. A method for generating a laser point according to claim 4, characterized in that: In step S3, the focused laser point a is located on the angular bisector of the edge angle of the reflector slit (2) at the incident surface (4); by arranging the focused laser point a on the angular bisector, the intervals between the laser points on the working surface are evenly distributed at equal angles; and by adjusting the angle of the reflector slit (2), the distribution angle of the laser point intervals on the working surface is changed.

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