CN110596904B - A laser plane generation device based on micro-cylindrical lens array - Google Patents

A laser plane generation device based on micro-cylindrical lens array Download PDF

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CN110596904B
CN110596904B CN201910928002.XA CN201910928002A CN110596904B CN 110596904 B CN110596904 B CN 110596904B CN 201910928002 A CN201910928002 A CN 201910928002A CN 110596904 B CN110596904 B CN 110596904B
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laser
micro
cylindrical lens
lens array
module
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CN110596904A (en
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黄腾超
王先帆
牟家鹏
张红亮
张彩妮
车双良
舒晓武
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Zhejiang University ZJU
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    • GPHYSICS
    • G02OPTICS
    • G02BOPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B27/00Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/09Beam shaping, e.g. changing the cross-sectional area, not otherwise provided for
    • G02B27/0916Adapting the beam shape of a semiconductor light source such as a laser diode or an LED, e.g. for efficiently coupling into optical fibers
    • GPHYSICS
    • G02OPTICS
    • G02BOPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B27/00Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/09Beam shaping, e.g. changing the cross-sectional area, not otherwise provided for
    • G02B27/0938Using specific optical elements
    • G02B27/095Refractive optical elements
    • G02B27/0955Lenses
    • G02B27/0961Lens arrays
    • GPHYSICS
    • G02OPTICS
    • G02BOPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B27/00Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/09Beam shaping, e.g. changing the cross-sectional area, not otherwise provided for
    • G02B27/0938Using specific optical elements
    • G02B27/095Refractive optical elements
    • G02B27/0955Lenses
    • G02B27/0966Cylindrical lenses
    • GPHYSICS
    • G02OPTICS
    • G02BOPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B27/00Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/09Beam shaping, e.g. changing the cross-sectional area, not otherwise provided for
    • G02B27/0938Using specific optical elements
    • G02B27/095Refractive optical elements
    • G02B27/0972Prisms
    • GPHYSICS
    • G02OPTICS
    • G02BOPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B7/00Mountings, adjusting means, or light-tight connections, for optical elements
    • G02B7/02Mountings, adjusting means, or light-tight connections, for optical elements for lenses
    • G02B7/023Mountings, adjusting means, or light-tight connections, for optical elements for lenses permitting adjustment
    • GPHYSICS
    • G02OPTICS
    • G02BOPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B7/00Mountings, adjusting means, or light-tight connections, for optical elements
    • G02B7/18Mountings, adjusting means, or light-tight connections, for optical elements for prisms; for mirrors
    • G02B7/1805Mountings, adjusting means, or light-tight connections, for optical elements for prisms; for mirrors for prisms

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Abstract

本发明公开了一种基于微柱状透镜阵列的激光平面生成装置。该装置包括激光光源模块、旋转棱镜模块、微柱状透镜阵列模块和调节机构;微柱状透镜阵列模块是由很多个微型柱状透镜紧密排列在聚甲基丙烯酸甲酯材料的平板波导衬底上构成的,激光光源模块发出一束准直的激光,旋转棱镜模块将激光的传输方向偏转90°,激光照射到微柱状透镜阵列模块后,透射后的激光光线会沿柱状透镜径向展宽,在空间中形成一个激光扇面;激光扇面的坡度和高低位置可以通过控制步进电机或者旋转棱镜模块灵活更改。本发明不仅凭借简单的装置可以实现激光平面的生成,而且可以方面灵活的控制激光平面的坡度和高度。

Figure 201910928002

The invention discloses a laser plane generating device based on a micro-cylindrical lens array. The device includes a laser light source module, a rotating prism module, a micro-cylindrical lens array module and an adjustment mechanism; the micro-cylindrical lens array module is composed of many micro-cylindrical lenses closely arranged on a planar waveguide substrate made of polymethyl methacrylate material. , the laser light source module emits a collimated laser beam, and the rotating prism module deflects the transmission direction of the laser light by 90°. After the laser is irradiated to the micro-cylindrical lens array module, the transmitted laser light will expand along the radial direction of the cylindrical lens. A laser fan is formed; the slope and height of the laser fan can be flexibly changed by controlling the stepping motor or rotating the prism module. The present invention can not only realize the generation of the laser plane by means of a simple device, but also can flexibly control the slope and height of the laser plane.

Figure 201910928002

Description

Laser plane generating device based on micro-cylindrical lens array
Technical Field
The invention relates to a laser plane generating device, in particular to a laser plane generating device based on a micro-cylindrical lens array.
Background
Compared with traditional light sources such as incandescent lamps and light emitting diodes, laser has the advantages of high brightness, high coherence, good directivity and the like, and is widely applied to the fields of optical ranging, optical positioning, optical radars, optical sensing and the like. In many scenes, the distance and the direction of a far target object can be accurately measured by using a laser beam, and compared with a traditional measuring mode, the laser measuring method has the advantages of higher accuracy, more compact structure and lower power consumption. However, the narrow irradiation range of the single laser beam is limited, and the requirements of many scenes cannot be met, for example, when multiple targets need laser calibration at the same time, the single laser beam cannot be realized, and a laser plane is needed. The laser plane has extensive application in aspects such as building engineering and machine-building, for example can generate a horizontally laser plane and assist and accomplish land leveling work, the floating work on level ground and indoor decoration work etc. compare in traditional ink marker and theodolite, not only can save a large amount of manpower and materials with the help of the laser plane, raise the efficiency, but also can reach better effect.
However, the laser plane is generated by deflecting a light beam emitted from a laser by using a rectangular prism or a pentagonal prism, and then driving the prism to rotate rapidly by using a rotating motor, so as to generate a scanned laser plane in a space environment. The generation mode of the laser plane is widely applied to instruments similar to a laser swinger and the like, and although the use requirements of some scenes can be met, the instrument has larger volume, heavier weight and larger energy consumption due to the fact that the instrument comprises a motor.
Disclosure of Invention
In order to overcome the above disadvantages, an object of the present invention is to provide a laser plane generating device based on a micro-cylinder lens array, wherein the micro-cylinder lens array made of PMMA material is used to widen a laser beam along the radial direction of the cylinder lens, a laser sector is formed in the space, the micro-cylinder lens array module is driven to rotate around the laser axis by controlling a stepping motor to change the slope of the laser sector and the rotating prism module is controlled to change the height of the laser sector.
The invention discloses a laser plane generating device based on a micro-cylindrical lens array, which comprises: the laser light source module adopts a semiconductor laser diode, and a collimating lens structure is arranged at an emergent end, so that the divergence angle of emergent laser is reduced; the rotating prism module receives the emergent laser light of the laser light source module and deflects the laser transmission direction by 90 degrees by utilizing mirror reflection; the micro-cylindrical lens array module is formed by closely arranging a plurality of micro-cylindrical lenses on a flat waveguide substrate, laser rays emitted by the rotating prism module are uniformly spread along a certain direction, and laser leaves the micro-cylindrical lens array module to form a laser sector in a free space; the adjusting structure comprises a stepping motor, a thread block, a screw rod and a transmission mechanism, wherein the thread block is connected with the micro-cylindrical lens array module, and the stepping motor drives the thread block on the screw rod through the transmission mechanism to drive the micro-cylindrical lens array module to rotate.
The micro cylindrical lenses on the micro cylindrical lens array module have the same size, the diameter of each cylindrical lens is smaller than the diameter of a light spot of laser emitted by the laser source module, and when laser passes through the micro cylindrical lenses, the length of the broadened light is larger and larger along with the propagation distance, so that a laser sector is formed in a space environment.
One end of the micro-cylindrical lens array module is installed on the thread block, and the stepping motor drives the micro-cylindrical lens array module to rotate around a laser optical axis to form a laser sector with gradient.
The micro-cylindrical lens array module is made of polymethyl methacrylate, the cylindrical lens is formed through thermal molding, and the protruding part is half of the cylindrical lens.
The wavelength of the laser light source module is 635nm or 532 nm.
The rotating prism module is a right-angle prism or a pentagonal prism.
When the rotary prism module moves up and down along the laser optical axis, the height position of the formed laser sector in the space is changed in response.
Compared with the prior art, the invention has the beneficial effects that:
1. the invention has the advantages of simple mechanical structure, small device volume, easy installation and adjustment, flexible and convenient use and the like.
2. The laser plane with different heights and different gradients can be realized by controlling the adjusting structure, so that the laser plane with the adjustable height can be applied to more occasions and is more widely applied.
Drawings
FIG. 1 is a block diagram of the module of the laser plane generating device based on micro-cylindrical lens array according to the present invention;
FIG. 2 is a schematic structural diagram of a laser plane generating device based on a micro-cylindrical lens array according to the present invention;
FIG. 3 is a schematic structural diagram of another laser plane generating device based on micro-cylindrical lens array according to the present invention;
FIG. 4 is a schematic structural diagram of a micro-cylindrical lens array module according to the present invention;
FIG. 5 is an image of a laser spot incident on a micro-lenticular lens array;
fig. 6 is an image of a laser spot emitted from the micro-cylinder lens array.
In the figure: the device comprises a laser light source module 1, a right-angle prism 2, a micro-cylindrical lens array module 3, an adjusting mechanism 4, incident laser rays 5, deflection laser rays 6, a laser sector 7 and a pentagonal prism 8.
Detailed Description
The invention is further elucidated with reference to the drawing.
As shown in fig. 1, the laser plane generating apparatus based on the micro-cylindrical lens array of the present invention includes a laser light source module, a rotating prism module, a micro-cylindrical lens array module, and an adjusting mechanism.
Fig. 2 is a schematic structural diagram of a laser plane generating device based on a micro-cylindrical lens array according to the present invention, including: the laser light source module 1 adopts a semiconductor laser diode, a collimating lens structure is arranged at an emergent end, the divergence angle of emergent laser is reduced, and in order to increase the visibility of a laser plane, a laser light source is selected to be red light with a wavelength of 635nm or green light with a wavelength of 532 nm; the rotating prism module adopts a right-angle prism 2, and deflects the laser light 5 received from the laser light source module by 90 degrees by utilizing mirror reflection to emit the laser light; the right-angle prism can move up and down along the incident laser ray 5 to achieve the purpose of adjusting the height of the laser plane. The micro-cylindrical lens array module 3 uniformly spreads laser rays 6 emitted by the rotating prism module along a certain direction, laser leaves the micro-cylindrical lens array module 3 and forms a laser sector 7 in a free space, and the laser sector 7 is vertical to the axial direction of the micro-cylindrical lens; adjust structure 4, including step motor, thread block, lead screw and drive mechanism, the thread block with little cylindricality lens array module 3 is connected, and step motor drives through the thread block on the drive mechanism drive lead screw, drives then little cylindricality lens array module 3 is rotatory, adjusts the slope of laser sector 7.
Fig. 3 is another schematic structural diagram of a laser plane generating device based on a micro-cylindrical lens array according to the present invention, including: the laser light source module 1 adopts a semiconductor laser diode, a collimating lens structure is arranged at an emergent end, the divergence angle of emergent laser is reduced, and in order to increase the visibility of a laser plane, a laser light source is selected to be red light with a wavelength of 635nm or green light with a wavelength of 532 nm; the rotating prism module adopts a pentagonal prism 8, and deflects the laser light 5 received from the laser light source module by 90 degrees by utilizing mirror reflection to emit the laser light; the pentagonal prism 8 can move up and down along the incident laser ray 5 to achieve the purpose of adjusting the height of the laser plane. The micro-cylindrical lens array module 3 uniformly spreads laser rays 6 emitted by the rotating prism module along a certain direction, laser leaves the micro-cylindrical lens array module 3 and forms a laser sector 7 in a free space, and the laser sector 7 is vertical to the axial direction of the micro-cylindrical lens; adjust structure 4, including step motor, thread block, lead screw and drive mechanism, the thread block with little cylindricality lens array module 3 is connected, and step motor drives through the thread block on the drive mechanism drive lead screw, drives then little cylindricality lens array module 3 is rotatory, adjusts the slope of laser sector 7.
Fig. 4 is a schematic structural diagram of a micro-cylindrical lens array module according to the present invention, the micro-cylindrical lens array module is formed by closely arranging a plurality of micro-cylindrical lenses on a slab waveguide substrate, the micro-cylindrical lens array module may be made of polymethyl methacrylate (PMMA), and the cylindrical lenses are formed by thermal molding.
Application examples
Fig. 5 is a laser spot image of the incident micro-cylindrical lens array, the laser spot of the incident micro-cylindrical lens array is simulated through ZEMAX optical simulation software, the wavelength of the laser light source is set to be 635nm, the diameter of the laser spot is 7mm, the laser spot does not change before the laser is not incident on the micro-cylindrical lens array module, the circularly symmetric shape is maintained, and fig. 5 is the simulated laser spot image of the incident micro-cylindrical lens array.
Fig. 6 is an image of a laser spot emitted from the micro-cylinder lens array. Simulating laser spots incident on the micro cylindrical lens array by ZEMAX optical simulation software, wherein the wavelength of a laser source is set to be 635nm, the diameter of the laser spots is 7mm, the height of each convex part of each micro cylindrical lens in the micro cylindrical lens array module is set to be 0.05mm, the width of each convex part of each micro cylindrical lens is set to be 0.32mm, and a laser spot image is obtained by simulation when laser is emitted from the micro cylindrical lens array and transmitted for 1000mm, as shown in FIG. 6; from the results in the figure, it can be seen that the originally circularly symmetric laser spot becomes a slender laser line, the length of the laser line is about 800mm, and the width is equal to the diameter of the incident laser spot, which is 7 mm.

Claims (2)

1.一种基于微柱状透镜阵列的激光平面生成装置,其特征在于:包括激光光源模块、旋转棱镜模块、微柱状透镜阵列模块和调节机构;1. A laser plane generating device based on a micro-cylindrical lens array, characterized in that: comprising a laser light source module, a rotating prism module, a micro-cylindrical lens array module and an adjustment mechanism; 所述的激光光源模块,采用半导体激光二极管,半导体激光二极管的出射端设有准直透镜结构,减小出射激光的发散角;The laser light source module adopts a semiconductor laser diode, and the output end of the semiconductor laser diode is provided with a collimating lens structure to reduce the divergence angle of the emitted laser light; 所述的旋转棱镜模块,接收所述激光光源模块的出射激光光线,利用镜面反射将激光传输方向偏转90°;The rotating prism module receives the outgoing laser light from the laser light source module, and uses specular reflection to deflect the laser transmission direction by 90°; 所述的微柱状透镜阵列模块,由多个微型柱状透镜紧密排列在平板波导衬底上构成,将所述旋转棱镜模块出射的激光光线均匀展开,形成一个激光扇面;The micro-cylindrical lens array module is composed of a plurality of micro-cylindrical lenses closely arranged on a planar waveguide substrate, and the laser light emitted by the rotating prism module is evenly expanded to form a laser fan; 所述的调节机构,包括步进电机、螺纹块、丝杆和传动机构,螺纹块与所述微柱状透镜阵列模块连接,步进电机带动通过传动机构驱动丝杆上的螺纹块,继而带动所述微柱状透镜阵列模块旋转;The adjusting mechanism includes a stepping motor, a threaded block, a screw rod and a transmission mechanism. The threaded block is connected to the micro-cylindrical lens array module, and the stepping motor drives the threaded block on the screw rod through the transmission mechanism, which in turn drives the the micro-cylindrical lens array module is rotated; 所述微柱状透镜阵列模块上的微型柱状透镜均具有相同的尺寸,柱状透镜的直径小于所述激光光源模块出射激光的光斑直径;The micro-cylindrical lenses on the micro-cylindrical lens array module all have the same size, and the diameter of the cylindrical lens is smaller than the spot diameter of the laser light emitted by the laser light source module; 所述微柱状透镜阵列模块的材料采用聚甲基丙烯酸甲酯,柱状透镜通过热塑成型,柱状透镜的部分凸出平板波导衬底,其余部分与平板波导衬底合为一体;The material of the micro-cylindrical lens array module is polymethyl methacrylate, the cylindrical lens is formed by thermoplastic, part of the cylindrical lens protrudes from the flat-plate waveguide substrate, and the rest is integrated with the flat-plate waveguide substrate; 所述微柱状透镜阵列模块一端安装在螺纹块上,步进电机工作驱动所述微柱状透镜阵列模块绕激光光轴旋转,形成具有坡度的激光扇面;One end of the micro-cylindrical lens array module is installed on the threaded block, and the stepping motor drives the micro-cylindrical lens array module to rotate around the laser optical axis to form a laser fan with a slope; 所述旋转棱镜模块为直角棱镜或者五角棱镜;The rotating prism module is a right-angle prism or a pentagonal prism; 所述旋转棱镜模块可沿激光光轴上下移动。The rotating prism module can move up and down along the laser optical axis. 2.如权利要求1所述的激光平面生成装置,其特征在于:所述激光光源模块的波长为635 nm或者532nm。2 . The laser plane generating device according to claim 1 , wherein the wavelength of the laser light source module is 635 nm or 532 nm. 3 .
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