Method and device for generating large-aperture linear parallel light source

Abstract

The invention discloses a method and a device for generating a large-aperture linear parallel light source, and relates to the technical field of laser equipment. The problems that in the prior art, a linear parallel light source is small in caliber and short in working distance are solved. Comprising the following steps: determining the working range of a line light source according to the emission angle of the light source in the main optical axis direction, the focal length of a collimating lens, the focal length of a large-aperture spliced lens and the maximum line width set in the working range of the line light source; the length of the line light source is determined according to the refractive index of the Powell prism, the vertex angle of the Powell prism and the focal length of the large-diameter spliced lens; a point light source emitted by the light source is expanded and collimated through the collimating lens to form parallel light beams; the parallel light beams are expanded along the horizontal direction through the Powell prism to form a line light source meeting the working range and length; and the line light source is collimated in the horizontal direction through the large-aperture spliced lens group to obtain large-aperture line parallel light.

Description

Technical Field

[0001] The present invention relates to the technical field of laser devices, and more particularly to a method and apparatus for generating a large-aperture line parallel light source. Background Art

[0002] In the fields of optical measurement, machine vision, surface topography detection, etc., the line light source, as an important illumination tool, its performance directly affects the measurement accuracy and imaging quality. And the line light source with a large aperture and a long working distance has wide applications in large-area illumination, high-precision detection, and long-distance imaging. Its core features include a large aperture to provide a wider illumination range, a long working distance to ensure good light uniformity at a long distance, and at the same time a low divergence angle to maintain the collimation of the light beam, ensuring the requirements of high-precision applications.

[0003] However, the existing line light source generation devices have the following defects:

[0004] (1) It is difficult to meet the requirements of miniaturization and integration: With the continuous expansion of the application fields, higher requirements are put forward for the volume and weight of the line light source generation device, while the large-aperture line light source generation device has a large volume, high generation cost and difficulty.

[0005] (2) The working distance of the line light source is short, resulting in that in the field of industrial inspection, when using the line light source for large-range line scanning, its line width can only be stable within 1 mm within a short working distance, restricting the working range of the line scanning.

[0006] Therefore, developing a new type of large-aperture line light source generation device to overcome the deficiencies of the existing technology has important practical significance. Summary of the Invention

[0007] Embodiments of the present invention provide a method and apparatus for generating a large-aperture line parallel light source, which are used to solve the problems of small aperture and short working distance of the existing line parallel light source.

[0008] Embodiments of the present invention provide a method for generating a large-aperture line parallel light source, including:

[0009] Determine the working range of the line light source according to the emission angle of the light source in the main optical axis direction, the focal length of the collimating lens, the focal length of the large-aperture splicing lens, and the maximum line width required within the working range of the line light source;

[0010] Determine the length of the line light source according to the refractive index of the Powell prism, the apex angle of the Powell prism, and the focal length of the large-aperture splicing lens;

[0011] Expand and collimate the point light source emitted by the light source through the collimating lens to form a parallel light beam;

[0012] The parallel light beam is expanded horizontally through a Powell prism to form a line light source that meets the working range and length.

[0013] The line light source is collimated horizontally through a large-aperture splicing lens group to obtain a large-aperture line parallel light.

[0014] Preferably, the working range of the line light source is determined by the following formula:

[0015]

[0016] where D represents the working range of the line light source, x2 represents the maximum line width required within the working range of the line light source, f1 represents the focal length of lens 2, d represents the distance from the position of the maximum line width to the focal point position, f2 represents the focal length of the large-aperture splicing lens group, and θ x represents the divergence angle of the light source in the main optical axis direction.

[0017] Preferably, the length of the line light source is determined by the following formula:

[0018]

[0019] where y represents the length of the line light source, f2 represents the focal length of the large-aperture splicing lens group, n1 represents the refractive index of air, n2 represents the refractive index of the Powell prism, and α represents the apex angle of the Powell prism.

[0020] An embodiment of the present invention provides a device for generating a large-aperture line parallel light source, including:

[0021] A light source for emitting a point light source;

[0022] A collimating lens, which is arranged on the main optical axis of the light source and is used to collimate and expand the point light source to form a parallel light beam;

[0023] A Powell prism, which is concentrically arranged with the collimating lens and is used to convert the parallel light beam into a line light source that meets the working range and length;

[0024] A large-aperture splicing lens group, which is concentrically arranged with the collimating lens, and the line light source forms a large-aperture line parallel light through the large-aperture splicing lens group.

[0025] Preferably, the refractive index of the Powell prism is at least equal to 1.8.

[0026] Preferably, the large-aperture splicing lens group is spliced by a plurality of large focal length lenses with the same focal length and cut into rectangles, and the number of the large focal length lenses is related to the length of the line light source;

[0027] The distance between the Powell prism and the large-aperture spliced lens group is equal to the focal length of the large-aperture spliced lens group.

[0028] Preferably, a reflector is further included. The reflector is arranged in the light-emitting direction of the large-aperture spliced lens group and forms an angle with the large-aperture spliced lens group, and is used to change the propagation direction of the large-aperture collimated light from the large-aperture spliced lens group.

[0029] An embodiment of the present invention provides a computer device, which includes a memory and a processor. The memory stores a computer program. When the computer program is executed by the processor, the processor executes the method for generating the large-aperture collimated light source described in any one of the above.

[0030] An embodiment of the present invention provides a computer-readable storage medium, which stores a computer program. When the computer program is executed by a processor, the processor executes the method for generating the large-aperture collimated light source described in any one of the above.

[0031] In summary, an embodiment of the present invention provides a method and device for generating a large-aperture collimated light source. The method includes: determining the working range of the line light source according to the emission angle of the light source in the main optical axis direction, the focal length of the collimating lens, the focal length of the large-aperture spliced lens, and the maximum line width required within the working range of the line light source; determining the length of the line light source according to the refractive index of the Powell prism, the apex angle of the Powell prism, and the focal length of the large-aperture spliced lens; expanding and collimating the point light source emitted by the light source through the collimating lens to form a parallel light beam; expanding the parallel light beam horizontally through the Powell prism to form a line light source that meets the working range and length; collimating the line light source horizontally through the large-aperture spliced lens group to obtain large-aperture collimated light. The working range of the line light source provided by this method is relatively large, and the working range of the line light source can be adjusted; specifically, by setting a spliced lens group in this method, it can increase the working range of the line light source, and the working range of the line light source can be adjusted by increasing or decreasing the number of lenses in the large-aperture spliced lens; further, the line light source provided by this method has the characteristics of high parallelism and long working distance; the large-aperture spliced lens can slow down the convergence and divergence of the line light source in the vertical direction, so that the width of the finally obtained line light source is less than 1 mm within a very long range, greatly increasing the working distance of the line light source, thereby solving the problems of small aperture and short working distance existing in the existing collimated line light source. Description of the Drawings

[0032] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the 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 be obtained based on these drawings.

[0033] Figure 1 Schematic flow chart of a method for generating a large-aperture line parallel light source provided by an embodiment of the present invention;

[0034] Figure 2A Optical path diagram of a large-aperture splicing lens when determining the working range of a line light source provided by an embodiment of the present invention;

[0035] Figure 2B Optical path diagram of a collimating lens when determining the working range of a line light source provided by an embodiment of the present invention;

[0036] Figure 2C Optical path diagram of a Powell prism when determining the length of a line light source provided by an embodiment of the present invention;

[0037] Figure 3 Schematic diagram of the optical path principle in the horizontal direction provided by an embodiment of the present invention;

[0038] Figure 4 Schematic diagram of the optical path principle in the vertical direction provided by an embodiment of the present invention;

[0039] Figure 5 Schematic diagram of a horizontal-direction reflective large-aperture line parallel light source provided by an embodiment of the present invention;

[0040] Figure 6 Schematic diagram of a vertical-direction reflective large-aperture line parallel light source provided by an embodiment of the present invention;

[0041] Figure 7 Splicing diagram of a large-aperture splicing lens group provided by an embodiment of the present invention. Detailed implementation manners

[0042] 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.

[0043] Figure 1 Schematic flow chart of a method for generating a large-aperture line parallel light source provided by an embodiment of the present invention. The following will be combined with Figure 1The method for generating a large-aperture linear parallel light source provided by an embodiment of the present invention is described in detail by taking an example.

[0044] like Figure 1 As shown, the method comprises the following steps:

[0045] Step 101, determining the working range of the line light source according to the emission angle of the light source in the direction of the main optical axis, the focal length of the collimating lens, the focal length of the large-aperture spliced ​​lens and the maximum line width required within the working range of the line light source;

[0046] Step 102, determining the length of the line light source according to the refractive index of the Powell prism, the vertex angle of the Powell prism and the focal length of the large-aperture spliced ​​lens;

[0047] Step 103, the point light source emitted by the light source is expanded and collimated by the collimating lens to form a parallel light beam; the parallel light beam is expanded horizontally by a Powell prism to form a line light source that meets the working range and length; the line light source is collimated in the horizontal direction by a large-aperture spliced ​​lens group to obtain a large-aperture linear parallel light.

[0048] In step 101, it is necessary to first deduce the working range of the line light source based on the similar triangle theorem and the geometric relationship of light. Specifically, Figure 2A and 2B As shown, according to Figure 2A The similar triangles in the optical path diagram of the medium and large aperture stitching lens can be obtained as follows:

[0049]

[0050] Among them, x1 represents the line width of the incident light beam of the large-aperture spliced ​​lens, x2 represents the maximum line width within the working range of the design requirements, that is, the maximum line width set within the working range of the line light source, f2 represents the focal length of the large-aperture spliced ​​lens group, and d represents the working range of the line light source to be determined.

[0051] Further, according to Figure 2B The similar triangles in the optical path diagram of the collimating lens shown in the figure can be used to obtain the following formula:

[0052]

[0053] Among them, θ x It represents the divergence angle of the light source in the direction of the principal optical axis, and f1 represents the focal length of the collimating lens.

[0054] In the embodiment of the present invention, formula (1) and formula (2) can be combined to obtain a formula for calculating the working range of the line light source:

[0055]

[0056] According to formula (3), the working range of the linear light source is related to the focal length f1 of the collimating lens, the focal length f2 of the large-aperture mosaic lens, the divergence angle θ of the light source in the principal optical axis direction x and the maximum line width x2 required within the working range of the linear light source. Further, the working range of the linear light source is proportional to the focal length f2 of the large-aperture mosaic lens. Therefore, a large-aperture mosaic lens with a large focal length is required.

[0057] In step 102, according to Figure 2C the optical path of the Powell prism and the law of refraction as shown, the following formula can be obtained:

[0058]

[0059] where n1 represents the refractive index of air, usually taken as 1; n2 represents the refractive index of the Powell prism, α is the apex angle of the Powell prism, and θ1 represents the divergence angle of the light beam emerging from the Powell prism.

[0060] Further, after simplification, the divergence angle θ1 of the light beam emerging from the Powell prism is:

[0061]

[0062] After passing through the large-aperture mosaic lens, the length of the linear light source can be expressed by the following formula:

[0063]

[0064] where n represents the length of the linear light source, y2 represents the focal length of the large-aperture mosaic lens group, n1 represents the refractive index of air, n2 represents the refractive index of the Powell prism, and α represents the apex angle of the Powell prism.

[0065] According to the above derivation, the length of the linear light source is related to the focal length of the large-aperture mosaic lens group, the apex angle of the Powell prism, and the refractive index of the material of the Powell prism.

[0066] It should be noted that in practical applications, the two terms, the working range of the linear light source and the length of the linear light source, have obvious differences in terms of concept, calculation method, influencing factors, and practical applications. The working range of the linear light source reflects the distance interval where the linear light source works effectively, and the length of the linear light source reflects the geometric size of the linear light source itself. They describe the characteristics of the linear light source from different dimensions and jointly determine the application effect of the linear light source in various fields.

[0067] Specifically, the working range of the linear light source refers to the length range within which the linear light source can work effectively when meeting specific line width requirements (such as the line width being less than a certain value). It emphasizes the distance interval within which the linear light source can achieve stable and effective illumination, detection, etc. functions in space; the length of the linear light source refers to the geometric size of the linear light source itself in space, which is the distance from one end of the linear light source to the other end, describing the size of the linear light source itself.

[0068] The working range of the linear light source is affected by the divergence angle of the light source, the focal lengths of the collimating lens and the large-aperture splicing lens group, and the maximum line width required by the design. The smaller the divergence angle of the light source and the larger the focal length of the large-aperture splicing lens group, the larger the working range of the linear light source; the length of the linear light source mainly depends on the apex angle of the Powell prism, the refractive index of the material, and the focal length of the large-aperture splicing lens group. The larger the apex angle of the Powell prism, the higher the refractive index of the material, and the larger the focal length of the large-aperture splicing lens group, the larger the length of the linear light source.

[0069] In optical measurement, the working range of the linear light source determines the distance range that the measurement device can effectively detect. In long-distance pipeline detection, a linear light source with a long working range is required to ensure clear detection at different positions; in a machine vision system, the length of the linear light source affects the imaging range. When detecting the surface of a long strip-shaped object, the length of the linear light source needs to cover the detection area to ensure complete imaging.

[0070] In step 103, the point light source emitted by the light source is expanded and collimated through the collimating lens to form a parallel light beam; the parallel light beam is expanded horizontally through the Powell prism to form a linear light source that meets the working range and length; the linear light source is collimated horizontally through the large-aperture splicing lens group to obtain a large-aperture linear parallel light.

[0071] It should be noted that the light source provided in the embodiments of the present invention can be an LED light source or a laser diode.

[0072] The Powell prism in the embodiments of the present invention is also called a linear light source converter. In practical applications, due to the asymmetric curved surface design of the Powell prism, the propagation path of the light beam will produce different refractions and reflections in different regions. Its function in the vertical direction is similar to that of a parallel flat plate, and its function in the horizontal direction is similar to that of a lens, so that the light beam is expanded into a linear light source along the horizontal direction. According to the previous theoretical derivation, the divergence degree of the linear light source is related to the apex angle of the Powell prism and the refractive index of the material. In the embodiments of the present invention, the material of the Powell prism is a high refractive index material, and its refractive index is at least 1.8, or an optical glass with a higher refractive index is selected. Here, the material of the Powell prism is not limited.

[0073] Furthermore, as Figure 7As shown, the large-aperture spliced lens group provided by the embodiment of the present invention is spliced by a plurality of lenses with the same focal length and cut into rectangles. Each rectangular lens is a large focal length lens, and the number of rectangular lenses is determined according to the length of the required line light source. In practical applications, the function of the large-aperture spliced lens group is to collimate the divergent line light source emitted from the Powell prism in the horizontal direction to obtain a line light source with a fixed length.

[0074] In the embodiment of the present invention, the distance from the Powell prism to the large-aperture spliced lens group is equal to the focal length of the large-aperture spliced lens group.

[0075] Furthermore, in practical applications, if it is necessary to change the transmission direction of the large-aperture line parallel light from the large-aperture spliced lens group, a reflector can be set in the light-emitting direction of the large-aperture spliced lens group. At the same time, there is a certain angle between the reflector and the large-aperture spliced lens group, which can change the transmission direction of the large-aperture line parallel light and avoid the large-aperture line parallel light reflected by the reflector from being transmitted back along the light-emitting direction from the large-aperture spliced lens group. In practical applications, due to different specific requirements for changing the transmission direction of the large-aperture line parallel light from the large-aperture spliced lens group, the specific angle of the angle between the reflector and the large-aperture spliced lens group is not limited here.

[0076] The embodiment of the present invention also provides a generating device for a large-aperture line parallel light source, which includes a light source, a collimating lens, a Powell prism, and a large-aperture spliced lens group. Specifically, the light source is used to emit a point light source; the collimating lens is arranged on the main optical axis of the light source and is used to collimate and expand the point light source to form a parallel light beam; the Powell prism is concentrically arranged with the collimating lens and is used to convert the parallel light beam from the collimating lens into a line light source that meets the working range and length; the large-aperture spliced lens group is concentrically arranged with the collimating lens, and the line light source from the Powell prism forms a large-aperture line parallel light through the large-aperture spliced lens group.

[0077] The generating device for a large-aperture line parallel light source provided by the embodiment of the present invention may further include a reflector, which is arranged in the light-emitting direction of the large-aperture spliced lens group and has an angle with the large-aperture spliced lens group, and is used to change the propagation direction of the large-aperture line parallel light from the large-aperture spliced lens group.

[0078] To more clearly introduce the generating device for a large-aperture line parallel light source provided by the embodiment of the present invention, the following is combined with the attached Figure 3 、 Figure 4 And Figure 5 As an example, the generating device for a large-aperture line parallel light source is further introduced.

[0079] Such as Figure 3 And Figure 4As shown in the figure, a device for generating a large-aperture linear parallel light source provided by an embodiment of the present invention mainly includes a light source 1, a collimating lens 2, a Powell prism 3, and a large-aperture splicing lens group 4. Specifically, the light source 1 is placed at the focal length of the collimating lens 2. The point light source emitted by the light source 1 is expanded and collimated by the collimating lens 2 to form a parallel light beam. One curved end of the Powell prism 3 is close to the collimating lens 2, and the parallel light beam is expanded horizontally through the Powell prism to form a linear light source that meets the working range and length. The distance between the large-aperture splicing lens group 4 and the Powell prism 3 is the focal length of the large-aperture splicing lens group 4. The linear light source is collimated horizontally through the large-aperture splicing lens group to obtain a large-aperture linear parallel light.

[0080] In this example, the collimating lens 2 is used to collimate the light beam emitted by the basic light source into a parallel light beam and output it as a circular light beam. The Powell prism 3 is used to shape the circular light beam into a strip-shaped light beam. The large-aperture splicing lens group 4 is used to collimate the divergent strip-shaped light beam into a large-aperture strip-shaped light beam with a fixed length. The size of the large-aperture splicing lens group relative to the large-aperture lens, as well as the production and alignment difficulty, are greatly reduced. Moreover, the large focal length of the large-aperture splicing lens group enables the linear light source to have a working distance of more than 1 meter, making the working performance of the output light beam more stable.

[0081] Furthermore, on the basis of Figure 3 and Figure 4 , the embodiment of the present invention also provides a reflector. As shown in Figure 5 and Figure 6 , a device for generating a large-aperture linear parallel light source with a reflector added can also be called a reflective device for generating a large-aperture linear parallel light source. Specifically, it includes a light source 1, a collimating lens 2, a Powell prism 3, and a large-aperture splicing lens group 4. Specifically, the light source 1 is placed at the focal length of the collimating lens 2. The point light source emitted by the light source 1 is expanded and collimated by the collimating lens 2 to form a parallel light beam. One curved end of the Powell prism 3 is close to the collimating lens 2, and the parallel light beam is expanded horizontally through the Powell prism to form a linear light source that meets the working range and length. The distance between the large-aperture splicing lens group 4 and the Powell prism 3 is the focal length of the large-aperture splicing lens group 4. The linear light source is collimated horizontally through the large-aperture splicing lens group to obtain a large-aperture linear parallel light. A large-size reflector 5 is placed in the light-emitting direction of the large-aperture splicing lens group 4. The reflector 5 forms a certain angle with the large-aperture splicing lens group 4 to reflect the large-aperture linear parallel light obliquely upward. This reflective design can greatly reduce the volume and weight of the device, saving production costs and alignment difficulty.

[0082] In summary, the embodiments of the present invention provide a method and device for generating a large-aperture linear parallel light source. The method includes: determining the working range of the linear light source according to the emission angle of the light source in the main optical axis direction, the focal length of the collimating lens, the focal length of the large-aperture splicing lens, and the maximum line width required within the working range of the linear light source; determining the length of the linear light source according to the refractive index of the Powell prism, the apex angle of the Powell prism, and the focal length of the large-aperture splicing lens; expanding and collimating the point light source emitted by the light source through the collimating lens to form a parallel light beam; expanding the parallel light beam horizontally through the Powell prism to form a linear light source that meets the working range and length; collimating the linear light source horizontally through the large-aperture splicing lens group to obtain a large-aperture linear parallel light. Based on the similarity triangle theorem and the geometric relationship of light rays, this method determines the way to determine the working range of the linear light source. Therefore, in practical applications, according to the requirements of the working range of the linear light source, the working range of the linear light source can be adjusted by adjusting the focal length of the collimating lens, the focal length of the large-aperture splicing lens, and the emission angle of the light source in the main optical axis. Further, based on the refraction law, the way to determine the length of the linear light source is obtained. Therefore, the length of the linear light source can be adjusted by adjusting the refractive index, apex angle of the Powell prism, and the focal length of the large-aperture splicing lens group. Further, the linear light source provided by this method has the characteristics of high parallelism and long working distance. The large-aperture splicing lens can slow down the convergence and divergence of the linear light source in the vertical direction, so that the width of the finally obtained linear light source is less than 1 mm within a very long range, greatly increasing the working distance of the linear light source, thus solving the problems of small aperture and short working distance existing in the existing linear parallel light source.

[0083] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalent technologies, the present invention also intends to include these changes and modifications.

Claims

1. A method for generating a large-aperture linear parallel light source, characterized in that, Including: Determine the working range of the linear light source according to the emission angle of the light source in the main optical axis direction, the focal length of the collimating lens, the focal length of the large-aperture splicing lens, and the maximum line width required within the working range of the linear light source; Determine the length of the linear light source according to the refractive index of the Powell prism, the apex angle of the Powell prism, and the focal length of the large-aperture splicing lens; Expand and collimate the point light source emitted by the light source through the collimating lens to form a parallel light beam; the parallel light beam is expanded horizontally through the Powell prism to form a linear light source that meets the working range and length; the linear light source is collimated horizontally through the large-aperture splicing lens group to obtain a large-aperture linearly parallel light.

2. The method according to claim 1, wherein The working range of the linear light source is determined by the following formula: Among them, D represents the working range of the line light source, x2 represents the maximum line width required by the setting within the working range of the line light source, f1 represents the focal length of lens 2, f2 represents the focal length of the large-aperture splicing lens group, and θ x represents the divergence angle of the light source in the direction of the principal optical axis.

3. The method according to claim 1, wherein The length of the linear light source is determined by the following formula: Where y represents the length of the linear light source, f2 represents the focal length of the large-aperture splicing lens group, n1 represents the refractive index of air, n2 represents the refractive index of the Powell prism, and α represents the apex angle of the Powell prism.

4. The method according to claim 1, characterized in that After the linear light source is collimated horizontally through the large-aperture splicing lens group, it further includes: A reflector located in the light-emitting direction of the large-aperture splicing lens group and having an angle with the large-aperture splicing lens group, for reflecting the large-aperture linearly parallel light from the large-aperture splicing lens group and changing the propagation direction of the large-aperture linearly parallel light.

5. A generating device for a large-aperture line parallel light source, characterized in that, Including: A light source for emitting a point light source; A collimating lens disposed on the main optical axis of the light source for collimating and expanding the point light source to form a parallel light beam; A Powell prism concentrically disposed with the collimating lens for converting the parallel light beam into a linear light source that meets the working range and length; A large-aperture splicing lens group concentrically disposed with the collimating lens, and the linear light source forms a large-aperture linearly parallel light through the large-aperture splicing lens group.

6. The device according to claim 5, characterized in that The refractive index of the Powell prism is at least equal to 1.

8.

7. The device according to claim 5, characterized in that, The large-aperture splicing lens group is spliced by a plurality of large focal length lenses with the same focal length and cut into rectangles, and the number of the large focal length lenses is related to the length of the linear light source; The distance between the Powell prism and the large-aperture splicing lens group is equal to the focal length of the large-aperture splicing lens group.

8. The device according to claim 5, characterized in that, It further includes a reflector, and the reflector is disposed in the light-emitting direction of the large-aperture splicing lens group and has an angle with the large-aperture splicing lens group for changing the propagation direction of the large-aperture linearly parallel light from the large-aperture splicing lens group.

9. A computer device, characterized in that, The computer device includes a memory and a processor. When the computer program stored in the memory is executed by the processor, the processor executes the method for generating a large-aperture linearly parallel light source according to any one of claims 1-4.

10. A computer-readable storage medium, characterized in that, A computer program is stored, and when the computer program is executed by a processor, the processor executes the method for generating a large-aperture linearly parallel light source according to any one of claims 1-4.

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