Polygonal rotating mirror system with continuous scanning function

Abstract

The utility model discloses a continuous scanning polygon rotating mirror system, which comprises a laser source, a cylindrical mirror, a first polygon rotating mirror, a second polygon rotating mirror and a beam expander assembly, the laser source is used for generating a laser beam, the cylindrical mirror receives the laser beam and enables the laser beam to become a linear beam, and the linear beam is used for transmitting the linear beam to the second polygon rotating mirror. The first polygonal rotating mirror is driven by a first rotation driving mechanism to rotate around the central axis of the first polygonal rotating mirror, the side faces where all polygons of the first polygonal rotating mirror are located reflect the wire beam light in the same mode, and the second polygonal rotating mirror is driven by a second rotation driving mechanism to rotate around the central axis of the second polygonal rotating mirror. The second polygonal rotating mirror reflects the wire beam light and forms parallel array type wire beam light, and the beam expanding mirror assembly receives the array type wire beam light and expands the array type wire beam light. The polygonal rotating mirror system has no scanning blind area and can realize continuous scanning.

Description

Technical Field

[0001] The utility model belongs to the technical field of galvanometer scanning and relates to a continuous scanning polygonal rotating mirror system. Background Art

[0002] The laser scanning galvanometer is composed of a galvanometer motor and a dual galvanometer group, where the dual galvanometer group refers to two reflective lenses fixed to the output shaft of the galvanometer motor, namely the X-axis galvanometer and the Y-axis galvanometer. Galvanometer scanning is to first make the laser beam incident on the X-axis galvanometer, and then incident on the Y-axis galvanometer after reflection. After the secondary reflection of the Y-axis galvanometer, it can be projected onto the working plane to form a scanning point. Then the galvanometer motor drives the X and Y scanning galvanometers to deflect the beams to realize the movement of the laser beam within the predetermined scanning range, that is, to complete the scanning of the image. Among them, the different deflection methods of the two reflective lenses can make the laser scan different graphics.

[0003] However, the existing laser scanning galvanometer requires a high-speed rotating galvanometer motor, which places extremely high demands on the galvanometer motor. Since it takes time to rotate and switch the rotating mirror surface, a certain scanning blind area is created. The rotating mirror speed cannot be increased infinitely, and the image resolution and accuracy are difficult to improve. Utility Model Content

[0004] The utility model aims to provide a polygonal rotating mirror system for continuous scanning, which reduces the requirements on the galvanometer motor, has no scanning blind area, and can realize continuous scanning.

[0005] The technical solution adopted by the utility model is as follows:

[0006] A continuous scanning polygonal rotating mirror system comprises a laser source, a cylindrical mirror, a first polygonal rotating mirror, a second polygonal rotating mirror and a beam expander assembly, wherein the laser source is used to generate a laser beam, the cylindrical mirror receives the laser beam and converts it into a line beam, the first polygonal rotating mirror is driven to rotate around its own central axis by a first rotation drive mechanism, each polygon of the first polygonal rotating mirror has a side surface that reflects the line beam in the same manner, the second polygonal rotating mirror is driven to rotate around its own central axis by a second rotation drive mechanism, the second polygonal rotating mirror reflects the line beam and forms a parallel array of line beams, and the beam expander assembly receives the array of line beams and expands the beam.

[0007] Furthermore, the first polygonal rotating mirror includes a plurality of reflecting mirrors which are enclosed to form a regular polygon.

[0008] Furthermore, each of the reflectors is connected to an adjustment component.

[0009] Furthermore, the adjustment assembly includes an adjustment seat and a bolt, the adjustment seat is provided with a threaded hole, the bolt is threadedly connected to the threaded hole, the back of the reflector is provided with a slide groove perpendicular to the back of the reflector, and the lower part of the bolt is slidably arranged in the slide groove.

[0010] Furthermore, the beam expander group includes a first right-angle prism and a second right-angle prism, the oblique surface of the first right-angle prism receives the arrayed line beam light and emits it from the right-angle surface, and the oblique surface of the second right-angle prism receives the arrayed line beam light from the first right-angle prism and emits it from the right-angle surface.

[0011] Furthermore, the first rotation drive mechanism or the second rotation drive mechanism is a variable frequency speed regulating motor or a direct current speed regulating motor.

[0012] Compared with the prior art, the beneficial effects of the utility model are:

[0013] The polygonal rotating mirror system of the utility model comprises a laser source, a cylindrical mirror, a first polygonal rotating mirror, a second polygonal rotating mirror and a beam expander assembly. After the laser source generates a laser beam, the laser beam passes through the cylindrical mirror to form a vertical line beam light. Driven by the first rotating drive mechanism, the first polygonal rotating mirror rotates, so that the line beam light reflects the same light on each polygon. By adjusting the rotation speed of the first rotating drive mechanism and the second rotating drive mechanism, the line beam light forms an arrayed line beam light on the second polygonal rotating mirror. The arrayed line beam light is expanded by the beam expander assembly to expand the scanning area. The emitted light directly hits the measured environment, and the measured environment can be scanned in three dimensions. The requirements for the galvanometer motor of the present application are reduced, there is no scanning blind area, the measurement range is wide, and continuous scanning can be achieved. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the following is a brief introduction to the drawings required for use in the embodiments. It should be understood that the following drawings only show certain embodiments of the present utility model and should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without creative work, including:

[0015] Figure 1 This is a schematic structural diagram of a continuous scanning polygonal rotating mirror system according to an embodiment of the utility model;

[0016] Figure 2 It is a schematic structural diagram of the first polygonal rotating mirror in an embodiment of the utility model.

[0017] Markings in the figure:

[0018] 10-laser source; 11-line beam light; 12-array line beam light;

[0019] 20-cylindrical mirror;

[0020] 30-first polygonal rotating mirror; 31-reflecting mirror; 32-adjusting seat; 33-bolt; 34-first rotating driving mechanism;

[0021] 40- second polygonal rotating mirror;

[0022] 50-first right angle prism;

[0023] 60-Second right angle prism. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the utility model and are not used to limit the utility model, that is, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. The components of the embodiments of the utility model described and shown in the drawings here can be arranged and designed in various different configurations.

[0025] Therefore, the following detailed description of the embodiments of the utility model provided in the accompanying drawings is not intended to limit the scope of the utility model claimed for protection, but merely represents selected embodiments of the utility model. Based on the embodiments of the utility model, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the utility model.

[0026] It should be noted that relational terms such as "first" and "second" are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0027] As described in the background technology, the existing laser scanning galvanometer requires a high-speed rotating galvanometer motor, which has extremely high requirements for the galvanometer motor. Since it takes time to rotate and switch the rotating mirror surface, a part of the scanning blind area is caused. The rotating mirror speed cannot be increased infinitely, and the image resolution and accuracy are difficult to improve.

[0028] Based on this, the inventors have created a continuous scanning polygonal rotating mirror system of the present application to solve the above technical problems.

[0029] The features and performance of the present invention are further described in detail below in conjunction with the embodiments.

[0030] Example

[0031] See also Figure 1 , a continuous scanning polygonal rotating mirror system, comprising a laser source 10, a cylindrical mirror 20, a first polygonal rotating mirror 30, a second polygonal rotating mirror 40 and a beam expander assembly. The laser source 10 is used to generate a laser beam, and the cylindrical mirror 20 receives the laser beam and converts it into a line beam 11. Here, the line beam 11 refers to a laser with a vertical strip in the cross section. The first polygonal rotating mirror 30 is driven to rotate around its own central axis by a first rotation drive mechanism 34, and the side surface where each polygon of the first polygonal rotating mirror 30 is located reflects the line beam 11 in the same way. Here, it means that the reflection of the line beam 11 by each polygon can be consistent and has the same reflection effect. The second polygonal rotating mirror 40 is driven to rotate around its own central axis by a second rotation drive mechanism, and the second polygonal rotating mirror 40 reflects the line beam 11 and forms a parallel array of line beams 1211. The beam expander assembly receives the array of line beams 1211 and expands the beam. Here, that is to say, when the first line beam light 11 hits the second polygonal rotating mirror 40 to form a first beam of reflected light, when the first polygonal rotating mirror 30 rotates, the reflection angle of the second line beam light 11 on the first polygonal rotating mirror 30 will change. If the second polygonal rotating mirror 40 remains stationary, the incident angle of the second line beam light 11 on the second polygonal rotating mirror 40 will also change, and a second beam of reflected light will be formed at this time. At this time, the second beam of reflected light is definitely not parallel to the first beam of reflected light. The second polygonal rotating mirror 40 of the present application is driven to rotate by the second rotation drive mechanism. By adjusting the rotational speed of the first rotation drive mechanism 34 and the second rotation drive mechanism to form a cycle, the second beam of reflected light can be kept parallel to the first beam of reflected light, thereby forming an array-type line beam light 1211.

[0032] The polygonal rotating mirror system of the utility model comprises a laser source 10, a cylindrical mirror 20, a first polygonal rotating mirror 30, a second polygonal rotating mirror 40 and a beam expander assembly. After the laser source 10 generates a laser beam, the laser beam passes through the cylindrical mirror 20 to form a straight-line beam light 11. Driven by the first rotation drive mechanism 34, the first polygonal rotating mirror 30 rotates, so that the beam light 11 reflects the same light on each polygon. By adjusting the rotation speeds of the first rotation drive mechanism 34 and the second rotation drive mechanism, the beam light 11 forms an array beam light 1211 on the second polygonal rotating mirror 40. The array beam light 1211 is expanded by the beam expander assembly to expand the scanning area. The emitted light directly hits the measured environment, and the measured environment can be scanned in three dimensions. The requirements for the galvanometer motor of the present application are reduced, there is no scanning blind spot, the measurement range is wide, and continuous scanning can be achieved.

[0033] In another embodiment, the first polygonal rotating mirror 30 includes a plurality of reflectors 31 enclosed to form a regular polygon. Preferably, each of the reflectors 31 is connected to an adjustment component, so that the position of the reflector 31 is adjusted by the adjustment component, and the cost is significantly reduced compared to the polygonal rotating mirror processed in one piece. Preferably, the adjustment component includes an adjustment seat 32 and a bolt 33, the adjustment seat 32 is provided with a threaded hole, the bolt 33 is threadedly connected to the threaded hole, the back of the reflector 31 is provided with a slide groove perpendicular to the back thereof, the lower part of the bolt 33 is slidably arranged in the slide groove, and the position of the reflector 31 is adjusted by rotating the bolt 33, which is more convenient.

[0034] In another embodiment, the beam expander assembly includes a first right-angle prism 50 and a second right-angle prism 60, wherein the inclined surface of the first right-angle prism 50 receives the arrayed line beam light 1211 and emits it from the right-angle surface, and the inclined surface of the second right-angle prism 60 receives the arrayed line beam light 1211 from the first right-angle prism 50 and emits it from the right-angle surface. With such an arrangement, the beam expander assembly has a simple structure and low cost.

[0035] In another embodiment, the first rotation driving mechanism 34 or the second rotation driving mechanism is a variable frequency speed regulating motor or a DC speed regulating motor. In this way, stepless speed regulation can be achieved, and speed regulation is simple.

[0036] The above description is only a preferred embodiment of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions and improvements made by any technician familiar with the field within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A continuous scanning polygonal mirror system, characterized in that: It includes a laser source, a cylindrical mirror, a first polygonal rotating mirror, a second polygonal rotating mirror and a beam expander assembly, wherein the laser source is used to generate a laser beam, the cylindrical mirror receives the laser beam and converts it into a line beam, the first polygonal rotating mirror is driven to rotate around its own central axis by a first rotation drive mechanism, and each polygonal side of the first polygonal rotating mirror reflects the line beam in the same manner, the second polygonal rotating mirror is driven to rotate around its own central axis by a second rotation drive mechanism, the second polygonal rotating mirror reflects the line beam and forms a parallel array of line beams, and the beam expander assembly receives the array of line beams and expands the beam.

2. The continuous scanning polygon mirror system according to claim 1, characterized in that: The first polygonal rotating mirror includes a plurality of reflecting mirrors which are enclosed to form a regular polygon.

3. The continuous scanning polygon mirror system according to claim 2, characterized in that: Each of the reflectors is connected with an adjustment component.

4. The continuous scanning polygon mirror system according to claim 3, characterized in that: The adjustment assembly includes an adjustment seat and a bolt. The adjustment seat is provided with a threaded hole. The bolt is threadedly connected to the threaded hole. The back of the reflector is provided with a slide groove perpendicular to the back of the reflector. The lower part of the bolt is slidably arranged in the slide groove.

5. The continuous scanning polygon mirror system according to claim 1, characterized in that: The beam expander assembly includes a first right-angle prism and a second right-angle prism. The inclined surface of the first right-angle prism receives the arrayed line beam light and emits it from the right-angle surface. The inclined surface of the second right-angle prism receives the arrayed line beam light from the first right-angle prism and emits it from the right-angle surface.

6. The continuous scanning polygon mirror system according to claim 1, characterized in that: The first rotation drive mechanism or the second rotation drive mechanism is a variable frequency speed regulating motor or a direct current speed regulating motor.

Images