Scanning system

Abstract

The utility model discloses a scanning system, and relates to the technical field of laser scanning. The scanning system comprises a laser light source, a collimating lens and a prism disc which are sequentially arranged in the optical axis direction, in the rotating process of the prism disc, a first refraction part and a second refraction part on the prism disc can sequentially rotate to the optical axis, the thickness of the first refraction part is uniform, and the thickness of the second refraction part is uniform. When the first refraction part rotates to the optical axis, the laser light source does not deflect when passing through the prism disc, so that the first area can be scanned, the thickness of the second refraction part is gradually increased in the direction from the rotation center of the prism disc to the edge, and when the second refraction part rotates to the optical axis, the second area can be scanned. The laser light source deflects when passing through the prism disc, so that the second area can be scanned, and therefore, when the prism disc is adjusted to rotate, the first area and the second area can be scanned in sequence, and higher-efficiency laser scanning is realized.

Description

Technical Field

[0001] The utility model relates to the technical field of laser scanning, and particularly relates to a scanning system. Background Art

[0002] During the laser detection process, in order to quickly detect a target, it is necessary to quickly scan the area where the target is located. Especially when the area range is large, the scanning efficiency is very important. And the distance between the scanning area and the detection point, the scanning area, and the efficiency are contradictory. Especially when detecting a far target or scanning a large range, if the detection area of the device is large, a large laser power is required. If the detection area is small, it will take a long time to scan the target area.

[0003] Mid-infrared quantum cascade semiconductor lasers are widely used in the process of laser countermeasure. However, due to the small output power of a single chip, in order to detect a farther distance, it is necessary to collimate the divergence angle of the light spot to be very small, and the light spot irradiated to a long distance is also very small, resulting in difficulty in searching for the target. Summary of the Utility Model

[0004] The main object of the utility model is to propose a scanning system, aiming to provide a scanning system that can improve the laser scanning efficiency.

[0005] To achieve the above object, the utility model proposes a scanning system. The scanning system includes a laser light source, a collimating mirror, and a prism disk that are sequentially arranged along the optical axis direction. The prism disk is rotatably arranged, and the rotation center is eccentrically arranged with respect to the optical axis. The prism disk has a first refraction part and a second refraction part distributed along its circumferential direction. During the rotation of the prism disk, the first refraction part and the second refraction part can sequentially rotate onto the optical axis. The thickness of the first refraction part is uniformly arranged, and the thickness of the second refraction part gradually increases along the direction from the rotation center of the prism disk to the edge.

[0006] In one embodiment, the scanning system further includes:

[0007] A motor having an output shaft capable of transmitting rotational power, and the output shaft of the motor is connected to the rotation center of the prism disk; and,

[0008] A control device electrically connected to the laser light source and the motor.

[0009] In one embodiment, the thickness of the second refraction part gradually increases along the circumferential direction of the prism disk.

[0010] In one embodiment, the second refraction part includes a plurality of first lenses arranged along the circumferential direction of the prism disk. Each of the first lenses has a first mirror surface facing the collimator mirror and a second mirror surface facing away from the collimator mirror. The first mirror surface is arranged perpendicular to the optical axis, and the second mirror surface is inclined relative to the first mirror surface.

[0011] In one embodiment, the inclination angles of the second mirror surfaces of the plurality of first lenses are different.

[0012] In one embodiment, the projected areas of the plurality of first lenses in the optical axis direction are the same.

[0013] In one embodiment, the second refraction part includes a second lens. The thickness of the second lens gradually increases along the direction from the rotation center of the prism disk to the edge and along the circumferential direction of the prism disk.

[0014] In one embodiment, the plane projected areas of the first refraction part and the second refraction part in the optical axis direction are the same.

[0015] In one embodiment, both side surfaces of the first refraction part opposite to each other in the optical axis direction are arranged perpendicular to the optical axis.

[0016] In one embodiment, the scanning system further includes a window plate on the optical axis. The window plate is arranged on the side of the prism disk away from the laser light source.

[0017] In the technical solution provided by the present utility model, through the design of the prism disk on the optical axis, the thickness of the first refraction part is uniformly arranged. When the first refraction part rotates to the optical axis, the laser light source will not deflect when passing through the prism disk, so that the first area can be scanned. The thickness of the second refraction part gradually increases along the direction from the rotation center of the prism disk to the edge. When the second refraction part rotates to the optical axis, the laser light source will deflect when passing through the prism disk, so that at least the second area can be scanned. Therefore, when adjusting the rotation of the prism disk, the first area and the second area can be scanned in sequence to achieve higher-efficiency laser scanning. Therefore, the technical solution provided by the present utility model can, without moving the overall position of the scanning system, through the rotation of the prism disk, achieve target detection and scanning of multiple areas, thereby improving the efficiency of laser scanning. Description of the Drawings

[0018] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the accompanying drawings required for the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on the structures shown in these drawings.

[0019] Figure 1 Schematic three-dimensional diagram of an embodiment of the scanning system provided by the present invention;

[0020] Figure 2 For Figure 1 Schematic plan view of the prism disk in

[0021] Figure 3 Schematic diagram of the structure of the prism disk in another embodiment provided by the present invention;

[0022] Figure 4 Schematic diagram of the structure of the first lens in the prism disk provided by the present invention.

[0023] Explanation of the reference numerals in the drawings:

[0024] 100, scanning system; 1, laser light source; 2, collimating mirror; 3, prism disk; 31, first refraction part; 31a, first lens; 32, second refraction part; 33, first mirror surface; 34, second mirror surface; 4, motor; 41, output shaft; 5, control device; 6, window piece; a, first area; b, second area.

[0025] The realization, functional features and advantages of the object of the present invention will be further described with reference to the embodiments and the accompanying drawings. Detailed implementation manners

[0026] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, rather than all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0027] It should be noted that if there are directional indications (such as up, down, left, right, front, back...) involved in the embodiments of the present invention, the directional indications are only used to explain the relative positional relationship and movement conditions between components in a specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indications will also change accordingly.

[0028] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present utility model, the descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first", "second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions between various embodiments can be combined with each other, but it must be based on the fact that those of ordinary skill in the art can implement it. When the combination of technical solutions results in contradictions or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the protection scope required by the present utility model.

[0029] During the laser detection process, to quickly detect a target, it is necessary to quickly scan the area where the target is located. Especially when the area range is large, the scanning efficiency is very important. However, the distance between the scanning area and the detection point, the scanning area, and the efficiency are contradictory. Especially when detecting a far target or scanning a large range, if the detection area of the device is large, a large laser power is required. If the detection area is small, it takes a long time to scan the target area.

[0030] Mid-wave and long-wave infrared quantum cascade semiconductor lasers are widely used in the laser countermeasure process. However, due to the small output power of a single chip, to detect a farther distance, it is necessary to collimate the divergence angle of the light spot to be very small, and the light spot irradiated to a long distance is also very small, resulting in difficulty in searching for the target.

[0031] To solve this technical problem, the present utility model provides a scanning system to solve the problem of small laser detection area when the laser power is small during the laser detection process.

[0032] Please refer to Figure 1 and Figure 2 , the scanning system 100 includes a laser light source 1, a collimating mirror 2, and a prism disk 3 arranged in sequence along the optical axis direction. The prism disk 3 is rotatably arranged, and the rotation center is eccentrically arranged with respect to the optical axis. The prism disk 3 has a first refraction part 31 and a second refraction part 32 distributed along its circumferential direction. During the rotation of the prism disk 3, the first refraction part 31 and the second refraction part 32 can sequentially rotate onto the optical axis. The thickness of the first refraction part 31 is uniformly set, and the thickness of the second refraction part 32 gradually increases along the direction from the rotation center of the prism disk 3 to the edge.

[0033] In the technical solution provided by the present utility model, by designing the prism disk 3 on the optical axis, the thickness of the first refraction part 31 is uniformly set. When the first refraction part 31 rotates to the optical axis, the laser light source 1 will not deflect when passing through the prism disk 3, so that the first area a can be scanned. The thickness of the second refraction part 32 gradually increases along the direction from the rotation center of the prism disk 3 to the edge. When the second refraction part 32 rotates to the optical axis, the laser light source 1 will deflect when passing through the prism disk 3, so that at least the second area b can be scanned. Therefore, when adjusting the rotation of the prism disk 3, the first area a and the second area b can be scanned in sequence, realizing more efficient laser scanning. Therefore, the technical solution provided by the present utility model can, without moving the overall position of the scanning system 100, realize the target detection and scanning of multiple areas through the rotation of the prism disk 3, thereby improving the efficiency of laser scanning.

[0034] It can be understood that the laser light source 1 emits infrared laser with a wavelength of 4.2 - 9.7 μm, and the emitted light has a relatively large angle in both the horizontal and vertical directions. The collimating mirror 2 can control and manipulate the propagation direction of the light beam. In this solution, the collimating mirror 2 is used to collimate the light beam. The divergence angle of the collimated light is relatively small, generally within 10 mrad. The smaller the value, the farther the transmission distance. In addition, the collimated light can deflect to a small extent when entering and exiting the prism disk 3, which can better ensure that more light enters the prism disk 3 vertically.

[0035] The scanning system 100 further includes a motor 4 and a control device 5. The motor 4 has an output shaft 41 capable of transmitting rotational power, and the output shaft 41 of the motor 4 is connected to the rotation center of the prism disk 3; the control device 5 is electrically connected to the laser light source 1 and the motor 4. The control device 5 can control the on / off and the output energy size of the laser light source 1, and at the same time control the rotation and rotation speed of the motor 4, and further control the rotation and rotation speed of the prism disk 3. When the motor 4 does not rotate, a stable light spot is output. When the motor 4 rotates, the light spot in the distance makes a periodic scanning movement according to the optical path design.

[0036] Furthermore, both side surfaces of the first refraction part 31 opposite to each other along the optical axis direction are perpendicular to the optical axis. When light passes perpendicularly through the interface, almost no refraction occurs, so that the position of the light spot hitting the area to be scanned passing through the first refraction part 31 can be better controlled. In some embodiments, flat glass can be used as the first refraction part 31.

[0037] Please refer to Figure 3 , when the first refraction part 31 of the prism disk 3 is on the optical axis, the light travels along Figure 3It propagates along the dotted line in the figure until it reaches the first area a on the surface to be scanned. When the second refraction part 32 of the prism disk 3 is on the optical axis, the light ray propagates Figure 3 along the solid line in the figure until it reaches the second area b on the surface to be scanned. Therefore, when the motor 4 rotates to drive the prism disk 3 to rotate, the second refraction part 32 is on the optical axis, the optical path deflects by an angle, and the light spot is the second area b. When the motor 4 continues to rotate, the first refraction part 31 is on the optical axis, the optical path propagates linearly, and the light spot is the first area a. In this way, as the motor 4 rotates, the first refraction part 31 and the second refraction part 32 alternately cut into the optical path, realizing the change of the optical path. Further, the deflection angle of the optical path can also be controlled so that the edges of the first area a and the second area b are connected or coincident, that is, the light beam can be scanned between the first area a and the second area b.

[0038] Please refer to Figure 4 , in an embodiment of the present utility model, the second refraction part 32 includes a plurality of first lenses 31a arranged along the circumferential direction of the prism disk 3. Each of the first lenses 31a has a first mirror surface 33 facing the collimator 2 and a second mirror surface 34 facing away from the collimator 2. The first mirror surface 33 is perpendicular to the optical axis, and the second mirror surface 34 is inclined relative to the first mirror surface 33. Each of the lenses can be set as a sector-shaped wedge prism. Please refer to Figure 4 , when a beam of light passes through a wedge prism, the light beam will deflect, and its deflection angle is δ. When the included angle between the first mirror surface 33 and the second mirror surface 34 of the first lens 31a is α, δ=(n - 1)*α, where n is the refractive index at the transmission wavelength.

[0039] In order to further increase the scanned area, the inclination angles of the second mirror surfaces 34 of the plurality of first lenses 31a are different. That is, the included angles between the first mirror surface 33 and the second mirror surface 34 of each of the first lenses 31a are different. With such a setting, by rotating the motor 4 to insert each of the first lenses 31a into the optical path in turn, the propagation direction of the optical path can be changed more flexibly.

[0040] Further, the second refraction part 32 is arranged such that its thickness gradually increases along the circumferential direction of the prism disk 3. That is, the first lenses 31a with different included angles between the first mirror surface 33 and the second mirror surface 34 are arranged in order along the circumference from large to small or from small to large according to the change of the included angle. With such a setting, through the orderly deflection of the optical path, the scanning efficiency can be further improved. In some other embodiments, the first lenses 31a with different included angles between the first mirror surface 33 and the second mirror surface 34 can also be arranged disorderly along the circumference to meet other requirements of scanning. The present utility model does not limit this here.

[0041] Furthermore, the projected areas of the plurality of the first lenses 31a in the optical axis direction are the same. With such an arrangement, when the motor 4 drives the prism disk 3 to rotate at a constant speed, the time for the laser to pass through each first lens 31a is the same, so that the scanning time for each scanning area is the same, avoiding the situation where the scanning time is long in some places and short in others, and enabling sufficient scanning time for each area.

[0042] Furthermore, the projected area of the first lens 31a in the optical axis direction is the same as that of the first refraction part 31. In some embodiments, the second refraction part 32 only includes a wedge prism, and the projected area of the wedge prism in the optical axis direction is the same as that of the first refraction part 31 in the optical axis direction. Or rather, the angle occupied by the wedge prism in the prism disk 3 is the same as the angle occupied by the first refraction part 31 in the prism disk 3.

[0043] Specifically, when three areas need to be scanned, the prism disk 3 can be set as a circle and evenly divided into 3 parts. One part uses a flat glass, one part uses a wedge prism with an apex angle of M, and the last part uses a wedge prism with an apex angle of N, which can achieve three-point scanning.

[0044] In some other embodiments, the second refraction part 32 includes a second lens, and the thickness of the second lens gradually increases along the direction from the rotation center of the prism disk 3 to the edge and along the circumferential direction of the prism disk 3. Specifically, the second lens can be obtained by bonding a plurality of the above-mentioned first lenses 31a, or by designing a specific mold to integrally form a lens with the same shape as that obtained by bonding the above-mentioned plurality of first lenses 31a. Preferably, when the second lens is integrally formed, the falling off at the bonding place can be avoided during use, thereby increasing the service life.

[0045] Further, the planar projected areas of the first refraction part 31 and the second refraction part 32 in the optical axis direction are the same. In some other embodiments, the second refraction part 32 includes a third lens, the third lens has a first mirror surface 33 facing the collimator 2 and a second mirror surface 34 facing away from the collimator 2, the included angle between the first mirror surface 33 and the second mirror surface 34 of the third lens is the same, and the planar projected areas of the first refraction part 31 and the second refraction part 32 in the optical axis direction are the same. With such an arrangement, when the motor 4 drives the prism disk 3 to rotate at a constant speed, the time for the laser to pass through the first refraction part 31 and the second refraction part 32 is the same, so that the scanning time for each scanning area is the same.

[0046] In the actual use process, when performing the first large-scale scan, turn on the motor 4 and let it work in the scanning state. At the same time, use the infrared detector to detect the target. When the approximate position of the target is found, turn off the motor 4 and gradually aim the laser at the target until the target is destroyed.

[0047] Furthermore, the scanning system 100 further includes a window pane 6 on the optical axis, and the window pane 6 is disposed on the side of the prism disk 3 away from the laser light source 1. By providing the window pane 6, dust, water vapor and other impurities can be blocked to prevent them from contaminating the lenses in the optical path. The window pane 6 can be made of high-purity quartz, specially synthesized optical glass, advanced polymer film, etc. These materials not only have extremely high light transmittance, enabling the laser light to penetrate with less loss, but also have excellent dust and stain resistance.

[0048] The above are only exemplary embodiments of the present invention, and do not limit the patent scope of the present invention. Any equivalent structural transformation made under the technical concept of the present invention by using the content of the specification and drawings of the present invention, or any direct / indirect application in other related technical fields, is included in the patent protection scope of the present invention.

Claims

1. A scanning system, characterized in that: The scanning system includes a laser light source, a collimating mirror and a prism disk which are arranged in sequence along the optical axis. The prism disk can be rotatable, and the rotation center is eccentric to the optical axis. The prism disk has a first refractive portion and a second refractive portion distributed along its circumference. During the rotation of the prism disk, the first refractive portion and the second refractive portion can be rotated to the optical axis in sequence. The thickness of the first refractive portion is uniformly arranged, and the thickness of the second refractive portion gradually increases in the direction from the rotation center of the prism disk to the edge.

2. The scanning system according to claim 1, characterized in that The scanning system also includes: a motor having an output shaft capable of transmitting rotational power, wherein the output shaft of the motor is connected to the rotation center of the prism disk; and A control device is electrically connected to the laser light source and the motor.

3. The scanning system according to claim 1, characterized in that: The second refractive portion is arranged with a thickness gradually increasing along the circumferential direction of the prism disk.

4. The scanning system according to claim 1, characterized in that: The second refractive portion includes a plurality of first lenses arranged along the circumferential direction of the prism disk, each of the first lenses having a first mirror surface facing the collimating lens and a second mirror surface facing away from the collimating lens, the first mirror surface being arranged perpendicular to the optical axis, and the second mirror surface being arranged inclined relative to the first mirror surface.

5. The scanning system according to claim 4, characterized in that: The second mirror surfaces of the plurality of first lenses have different inclination angles.

6. The scanning system according to claim 4, characterized in that: The projection areas of the first lenses along the optical axis are the same.

7. The scanning system according to claim 1, characterized in that: The second refractive portion includes a second lens, and the thickness of the second lens is gradually increased along the direction from the rotation center of the prism disk to the edge and along the circumferential direction of the prism disk.

8. The scanning system according to claim 1, characterized in that: The first refractive portion and the second refractive portion have the same plane projection area along the optical axis direction.

9. The scanning system according to claim 1, characterized in that: Two opposite side surfaces of the first refractive portion along the optical axis direction are both arranged perpendicular to the optical axis.

10. The scanning system according to claim 1, wherein: The scanning system further comprises a window plate on the optical axis, wherein the window plate is arranged on a side of the prism disk away from the laser light source.

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