Focal power measuring system and measuring equipment

Abstract

The utility model provides a focal power measuring system and measuring equipment, and relates to the technical field of optical measurement, the measuring system comprises a light source module and a measuring module, a lens to be measured is located between the light source module and the measuring module, and the light source module emits an initial light beam; the measuring module comprises a beam splitting element, a first imaging element, a second imaging element and a processing element, the beam splitting element splits a measuring light beam formed by the initial light beam through the lens to be measured to form a first measuring light beam and a second measuring light beam, and the first imaging element forms a first image based on the first measuring light beam; the second imaging element forms a second image based on the second measuring light beam, and the processing element obtains the focal power of the to-be-measured lens based on at least one of the first image and the second image. Wherein a first distance is formed between the first imaging element and the beam splitting element, a second distance is formed between the second imaging element and the beam splitting element, and the first distance is not equal to the second distance.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of optical measurement, in particular to a power measurement system and a measurement device. BACKGROUND

[0002] The power of liquid lenses in the market is usually tested by focusing meter and lens measuring instrument. The focusing meter is a power measurement device frequently used in the industry, but due to the limitation of its own structure, the measurement range of the focusing meter is small, and the measurement error is large in a larger power range, and it cannot measure lenses with large power.

[0003] The lens measuring instrument measures the position of the focal length through the grating ruler, and then determines the power of the lens. However, the grating ruler needs to be operated during the measurement, which results in a long time for measuring the power. The zooming process of the liquid lens is very short, and the zooming range is wide and large, so it is impossible to detect the power of the zooming lens. CONTENT OF THE INVENTION

[0004] Therefore, the present application provides a power measurement system and a measurement device, and the scheme is as follows:

[0005] A power measurement system comprises:

[0006] A light source module forms an initial light beam;

[0007] A measurement module is located on the transmission path of the initial light beam, and a to-be-measured lens is placed between the light source module and the measurement module, and closer to the measurement module. The measurement module comprises a beam splitting element, a first imaging element, a second imaging element and a processing element;

[0008] The beam splitting element splits the measurement light beam formed by the initial light beam passing through the to-be-measured lens to form a first measurement light beam and a second measurement light beam, and transmits the first measurement light beam to the first imaging element along a first direction to form a first image, and transmits the second measurement light beam to the second imaging element along a second direction to form a second image. The first direction is parallel to the transmission direction of the measurement light beam, the first direction and the second direction intersect, and along the first direction, the first imaging element and the beam splitting element have a first distance, and along the second direction, the second imaging element and the beam splitting element have a second distance, and the first distance and the second distance are not equal;

[0009] The processing element obtains the power of the to-be-measured lens based on at least one of the first image and the second image.

[0010] Optionally, the light source module comprises a light emitting element, a parallel light tube and a diaphragm, the parallel light tube comprises a beam expander and a collimator;

[0011] The light emitting element emits a light source beam, the beam expander, the collimator and the diaphragm are arranged in sequence along the transmission direction of the light source beam, and the light source beam passes through the beam expander, the collimator and the diaphragm in sequence to form the initial light beam;

[0012] The transmission directions of the light source beam and the initial light beam are parallel to the first direction.

[0013] Optionally, the diaphragm comprises a plurality of through holes, the diameters of the plurality of through holes are the same, and the plurality of through holes comprise at least M first through holes located in a first area and N second through holes located in a second area; the first area is a middle area of the diaphragm, the second area surrounds the first area, the centers of the first area and the second area coincide with the center of the diaphragm, and the line connecting the first through hole and the second through hole passes through the center of the diaphragm;

[0014] Wherein, M=1, N≥1, the first through hole is located at the center of the first area; or

[0015] M=N, N>1, the first through holes are arranged in sequence along the direction surrounding the center of the diaphragm, and the second through holes correspond to the first through holes one by one.

[0016] Optionally, the plurality of through holes comprise M first through holes located in the first area, N second through holes located in the second area, and N third through holes located in a third area, the third area surrounds the second area, and the center of the third area coincides with the center of the diaphragm, the third through holes correspond to the second through holes one by one, and the line connecting the third through hole and the corresponding second through hole passes through the center of the diaphragm;

[0017] Wherein, the first through hole and the second through hole have a third distance, the second through hole and the corresponding third through hole have a fourth distance, and the third distance is equal to the fourth distance.

[0018] Optionally, the diaphragm comprises 17 through holes, the through holes are circular, M=1, N=8, and in the direction surrounding the first area in the second area, the included angle between the line connecting any two adjacent second through holes and the corresponding first through hole is 45°;

[0019] The third distance and the fourth distance are d1; along the first direction, a distance between the first imaging element and the lens under test is L1, and a distance between the beam splitting element and the lens under test is L2; along the second direction, a distance between the second imaging element and the beam splitting element is L3; in the first image, an image of the first through hole and an image of the second through hole have a fifth distance, and the image of the second through hole and an image of the third through hole have a sixth distance, the fifth distance and the sixth distance are equal, and both are d2; in the second image, the image of the first through hole and the image of the second through hole have a seventh distance, and the image of the second through hole and the image of the third through hole have an eighth distance, the seventh distance and the eighth distance are equal, and both are d3;

[0020] The lens under test is a first type of lens, the processing element obtains a focal power D1 of the lens under test based on the first image, D1 = 1000 × (d1-d2) / (d1×L1), and / or the processing element obtains a focal power D2 of the lens under test based on the second image, D2 = 1000 × (d1-d3) / (d1×(L2+L3));

[0021] The lens under test is a second type of lens, the processing element obtains a focal power D3 of the lens under test based on the first image and the second image, D3 = 1000 × (d2-d3) / (d1×(L2+L3-L1));

[0022] The thickness of the first type of lens is greater than the thickness of the second type of lens.

[0023] Optionally, the beam expanding element includes a first beam expanding lens and a second beam expanding lens arranged along the first direction, and the second beam expanding lens is located between the first beam expanding lens and the collimating element.

[0024] The first beam expanding lens is a meniscus lens with positive refractive index, and a side of the first beam expanding lens facing the light emitting element is a concave surface concave inward, and the other side is a convex surface convex outward.

[0025] The second beam expanding lens is a biconvex lens with positive refractive index.

[0026] Optionally, the collimating element includes a first collimating lens and a second collimating lens arranged along the first direction, the first collimating lens is located between the beam expanding element and the second collimating lens, and the second collimating lens is located between the first collimating lens and the light barrier.

[0027] The first collimating lens is a positive refractive index plano-convex lens, one side of the first collimating lens facing the beam expander is a convex surface protruding outward, and the other side is a plane, or the first collimating lens is a negative refractive index plano-concave lens, one side of the first collimating lens facing the beam expander is a concave surface recessing inward, and the other side is a plane.

[0028] The second collimating lens is a positive refractive index plano-convex lens, one side of the second collimating lens facing the first collimating lens is a plane, and the other side is a convex surface protruding outward.

[0029] Optionally, the light emitting element is an LED light emitting element.

[0030] The first imaging element is an imaging CMOS chip, and the second imaging element is an imaging CMOS chip.

[0031] Optionally, the beam splitting element comprises a light splitting prism and a light splitting film on a light splitting surface of the light splitting prism, and the light splitting film is a 50% light splitting film.

[0032] The measurement beam is transmitted to the light splitting surface of the light splitting prism, and the first measurement beam and the second measurement beam are formed through the light splitting film, and the light intensities of the first measurement beam and the second measurement beam are equal.

[0033] An optical power measuring device comprising the optical power measuring system.

[0034] Compared with the related art, the technical scheme of the present application has the following beneficial effects:

[0035] The measurement system comprises a light source module and a measurement module, the lens to be measured is located between the light source module and the measurement module, the light source module emits an initial light beam, the measurement module comprises a beam splitting element, a first imaging element, a second imaging element and a processing element, the beam splitting element splits the measurement light beam formed by the initial light beam through the lens to be measured to form a first measurement light beam and a second measurement light beam, the first imaging element forms a first image based on the first measurement light beam, the second imaging element forms a second image based on the second measurement light beam, and the processing element obtains the optical power of the lens to be measured based on at least one of the first image and the second image. Wherein, the first imaging element and the beam splitting element have a first distance, the second imaging element and the beam splitting element have a second distance, the first distance and the second distance are not equal, so that the optical path of the measurement light beam formed by the lens to be measured to the first imaging element and to the second imaging element is different, and when one of the first imaging element and the second imaging element is located at the best image plane of the lens to be measured, the other is not located at the best image plane of the lens to be measured, so that when one of the first imaging element and the second imaging element is located at the best image plane of the lens to be measured, the detection image is formed by the other imaging element, and the optical power of the lens to be measured can be measured, so that the measurement system can measure the optical power of the lens to be measured whose best image plane is not located at the first imaging element and the second imaging element, and can also measure the optical power of the lens to be measured whose best image plane is located at the first imaging element and the second imaging element, so that the detection system has a larger optical power detection range, that is, the range of the detection system is larger. At the same time, when the best image plane of the lens to be measured is located at the position of the first imaging element and the second imaging element, the position of the imaging element does not need to be moved to make it not coincide with the best image plane of the lens to be measured, and the detection image is directly formed by the other imaging element, so that the optical power of the lens to be measured can be measured, and the speed of optical power measurement can be improved. BRIEF DESCRIPTION OF DRAWINGS

[0036] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the related art, the drawings needed to be used in the embodiments or the prior art description will be briefly introduced. Obviously, the drawings in the following description are only embodiments of the present application, and those skilled in the art can obtain other drawings according to the provided drawings without creating any creative labor.

[0037] The structures, proportions, sizes, etc. shown in the drawings of the present specification are only used to cooperate with the content disclosed in the specification, so that those skilled in the art can understand and read, and are not used to limit the defined conditions under which the present application can be implemented, so they do not have technical significance. Any modification of structure, change of proportion relationship or adjustment of size, without affecting the effect and purpose that the present application can produce, should still fall within the scope of the technical content disclosed by the present application.

[0038] Figure 1 A structural schematic diagram of a power measurement system provided by the present application is shown in FIG. 1.

[0039] Figure 2 An image formed by the to-be-measured lens when the to-be-measured lens is a converging lens;

[0040] Figure 3 An image formed by the to-be-measured lens when the to-be-measured lens is a diverging lens;

[0041] Figure 4 A structural schematic diagram of a diaphragm is shown in FIG. 4;

[0042] Figure 5 A coordinate distribution diagram of each through hole in the diaphragm is shown in FIG. 5;

[0043] Figure 6 A structural schematic diagram of a collimator is shown in FIG. 6;

[0044] Figure 7 A structural schematic diagram of a collimating element is shown in FIG. 7;

[0045] Figure 8 A structural schematic diagram of another collimating element is shown in FIG. 8;

[0046] Figure 9 A working flow schematic diagram of a power measurement system provided by the present application is shown in FIG. 9. DETAILED DESCRIPTION

[0047] The embodiments in the present application will be described in detail below with the accompanying drawings of the embodiments of the present application. Obviously, the described embodiments are only some, but not all of the embodiments of the present application. Based on the embodiments in the present application, all the other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the protection scope of the present application.

[0048] In order to make the above objectives, characteristics and advantages of the present application more obvious and easy to understand, the present application will be further described in detail below with the accompanying drawings and specific embodiments.

[0049] As described in the background section, how to realize the power detection of liquid lenses and other lenses with short zooming time and large zooming range has become a key problem for those skilled in the art.

[0050] Based on the above, the present application provides a power measurement system, which is used for power measurement of a to-be-measured lens. As shown in FIG. 1, Figure 1 Figure 1 A structural schematic diagram of a power measurement system provided by the present application is shown in FIG. 1. The measurement system comprises:

[0051] A light source module 100, which is used for forming an initial light beam.​

[0052] The measurement module 200 is located on the transmission path of the initial light beam, the lens 1 to be measured is placed on the stage 2, and the lens 1 to be measured is located between the light source module 100 and the measurement module 200, that is, closer to the measurement module 200. When the power of the lens 1 to be measured is measured, the lens 1 to be measured is placed on the stage 2, the stage 2 is located between the light source module 100 and the measurement module 200, and the stage 2 is closer to the measurement module 200, so that the lens 1 to be measured is located between the light source module 100 and the measurement module 200, and closer to the measurement module 200.

[0053] The measurement module 200 includes a beam splitting element 202, a first imaging element 204, a second imaging element 206, and a processing element.

[0054] The beam splitting element 202 is used to split the measurement light beam formed after the initial light beam passes through the lens 1 to be measured, to form a first measurement light beam and a second measurement light beam, and transmit the first measurement light beam to the first imaging element 204 along a first direction. The first imaging element 204 then forms a first image based on the first measurement light beam. The beam splitting element 202 also transmits the second measurement light beam to the second imaging element 206 along a second direction. The second imaging element 206 then forms a second image based on the second measurement light beam. The first direction is parallel to the transmission direction of the measurement light beam formed after the initial light beam passes through the lens 1 to be measured, and the first direction and the second direction intersect. For the measurement system provided in the present application, along the first direction, the first imaging element 204 and the beam splitting element 202 have a first distance, and along the second direction, the second imaging element 206 and the beam splitting element 202 have a second distance. The first distance and the second distance are not equal. It should be noted that when the lens 1 to be measured is a converging lens, the first image and the second image can be as shown in FIG. 2A, and when the lens 1 to be measured is a diverging lens, the first image and the second image can be as shown in FIG. 2B. Figure 2 The processing element (not shown in the figure) obtains the power of the lens 1 to be measured based on at least one of the first image and the second image. As shown in FIG. 2C, the measurement system can further include a support rod 3 and a base 6, the support rod 3 is fixed to the base 6, a first clamp 4 and a second clamp 5 are arranged on the support rod 3, the first clamp 4 is used to clamp the light source module 100, and the second clamp 5 is used to clamp the stage 2 on which the lens 1 to be measured is placed. The measurement module 200 is arranged on a third clamp 7 (which can also be a stage) fixed to the base 6 and the support rod 3, so that during the power measurement, each optical element and the lens to be measured can be stably placed in a predetermined position, ensuring the accuracy of the measurement. Figure 3

[0055] The processing element (not shown in the figure) obtains the power of the lens 1 to be measured based on at least one of the first image and the second image. As shown in FIG. 2C, the measurement system can further include a support rod 3 and a base 6, the support rod 3 is fixed to the base 6, a first clamp 4 and a second clamp 5 are arranged on the support rod 3, the first clamp 4 is used to clamp the light source module 100, and the second clamp 5 is used to clamp the stage 2 on which the lens 1 to be measured is placed. The measurement module 200 is arranged on a third clamp 7 (which can also be a stage) fixed to the base 6 and the support rod 3, so that during the power measurement, each optical element and the lens to be measured can be stably placed in a predetermined position, ensuring the accuracy of the measurement. Figure 1 Figure 1

[0056] ​​​As can be seen from the above, in the measurement system provided in the present application, the first imaging element 204 and the beam splitting element 202 have a first distance therebetween along the transmission direction of the first measurement beam, the second imaging element 206 and the beam splitting element 202 have a second distance therebetween along the transmission direction of the second measurement beam, and the first distance and the second distance are not equal, so that the optical paths of the measurement beams (the first measurement beam and the second measurement beam) formed by the to-be-measured lens 1 and transmitted to the first imaging element 204 and the second imaging element 206 are different, and thus when one of the first imaging element 204 and the second imaging element 206 is located at the best image plane of the to-be-measured lens 1, the other is not located at the best image plane of the to-be-measured lens 1, so that when one of the first imaging element 204 and the second imaging element 206 is located at the best image plane of the to-be-measured lens 1, a detection image is formed by the other imaging element, and the optical power of the to-be-measured lens 1 can be measured, so that the measurement system can measure the optical power of the to-be-measured lens whose best image plane is located at the first imaging element 204 and the second imaging element 206, and thus the measurement system has a larger optical power detection range, that is, the measurement system has a larger range.

[0057] In addition, the measurement system provided in the present application includes the first imaging element 204 and the second imaging element 206, so that when the to-be-measured lens 1 is a thick lens, the optical power of the to-be-measured lens 1 can be calculated based on the first image and the second image, so as to eliminate the influence of the sag of the to-be-measured lens 1 on the measurement result, and thus the measurement can also realize the optical power measurement of the thick lens, that is, the measurement system can realize the optical power measurement of the thin lens and the thick lens. The thin lens can be defined as a lens whose focal length is at least ten times the central thickness of the lens, and the thick lens can be defined as a lens whose focal length is less than ten times the central thickness of the lens.

[0058] It should be noted that when the first imaging element 204 or the second imaging element 206 is located at the best image plane of the to-be-measured lens 1, the image formed by the imaging element located at the best image plane will be too small or too large. Since the too small or too large image formed by the imaging element will affect the accuracy of the measurement, in order to ensure the accuracy of the measurement, the optical power cannot be calculated based on the image formed by the imaging element located at the best image plane.

[0059] It should also be noted that for thick lenses, their sagitta is relatively large, which has a significant impact on optical power measurement. The measurement system provided in this application includes a first imaging element 204 and a second imaging element 206. The first image formed by the first imaging element 204 includes the sagitta information of the lens 1 under test, and the second image formed by the second imaging element 206 includes the sagitta information of the lens 1 under test. Therefore, when the lens 1 under test is a thick lens, the sagitta of the first image and the sagitta of the second image can be canceled out during the optical power calculation process, thereby eliminating the influence of sagitta on optical power measurement and realizing the optical power measurement of thick lenses.

[0060] In one embodiment of this application, such as Figure 1 As shown, the light source module 100 includes a light-emitting element 102, a collimator 104, and an aperture 106. The collimator 104 includes a beam expander 1042 and a collimator 1044. Figure 1 The beam expander 1042 and collimator 1044 are not shown in the figure.

[0061] The light-emitting element 102 emits a light beam. The beam expander 1042, collimator 1044, and aperture 106 are arranged sequentially along the transmission direction of the light beam, i.e., located on the light-emitting side of the light-emitting element 101, and arranged sequentially along the transmission direction of the light beam. This allows the light beam to pass through the beam expander 1042, collimator 1044, and aperture 106 in sequence to form an initial beam. The transmission directions of the light beam and the initial beam are parallel to a first direction, i.e., the transmission directions of the light beam and the initial beam are the same as the transmission direction of the measurement beam. This allows the light-emitting element 102, beam expander 1042, collimator 1044, aperture 106, and the lens under test 1 to be located on the same optical axis. Therefore, no additional optical elements are needed between the light source module 100 and the lens under test 1 to transmit the initial beam to the lens under test, simplifying the structure of the measurement system and reducing its size.

[0062] In one embodiment of this application, the aperture 106 includes a plurality of through holes 1062, and the plurality of through holes 1062 have the same diameter R, which can be 0.1 mm. Figure 4 and Figure 5 As shown, Figure 4 This is a schematic diagram of the structure of aperture 106. Figure 5 This is a coordinate distribution diagram of the centers of each through hole 1062 in the aperture 106. Based on this coordinate distribution diagram, the position of each through hole 1062 can be determined, and then the value of d1 can be obtained. The value of d1 can be 0.9mm. It should be noted that the through hole 1062 can also be other shapes besides circles, such as triangles, quadrilaterals, etc., but it is required that the shape and size of multiple through holes 1062 are the same.

[0063] The aforementioned plurality of through holes 1062 may include at least M first through holes 1064 located in the first region 108 and N second through holes 1066 located in the second region 110. The first region 108 is located in the middle region of the aperture 106, and the second region 110 includes the first region 108. The centers of the first region 108 and the second region 110 coincide with the center of the aperture 106. That is, the first region 108 can be a circular region whose center coincides with the center of the aperture 106, and the second region 110 can be an annular region whose center coincides with the center of the aperture 106. The line connecting the first through hole 1064 and the second through hole 1066 passes through the center of the aperture 106. Specifically, the line connecting the center of the first through hole 1064 and the center of the second through hole 1066 passes through the center of the aperture 106.

[0064] Based on the above, in one embodiment of this application, such as Figure 4 As shown, M=1, N≥1, and the first through hole 1064 is located at the center of the first region 108.

[0065] In another embodiment of this application, M=N, N>1, the first through holes 1064 are arranged sequentially along the direction surrounding the center of the aperture 106, and the second through holes 1066 correspond one-to-one with the first through holes 1064.

[0066] As can be seen from the above, the aperture 106 includes multiple through holes 1062. Therefore, when the first imaging element 204 and the second imaging element 206 form a detection image (first image and second image) based on the measurement beam formed by the initial beam through the lens under test 1, the detection image includes the image projected by the multiple through holes 1062 through the lens under test 1.

[0067] Since the multiple through holes 1062 include at least M first through holes 1064 located in the first region 108 and N second through holes 1066 located in the second region 110, the first region 108 is an intermediate region, and the second region 110 is located on the periphery of the intermediate region and surrounds the intermediate region, the multiple through holes 1062 can include through holes 1062 distributed throughout the aperture 106. Furthermore, since the aperture 106 is opposite to the lens 1 under test, the through holes 1062 at each location of the aperture 106 correspond to multiple regions of the lens 1 under test. This allows the image of the multiple through holes 1062 in the detection image to comprehensively reflect the morphological features of the lens 1 under test, thereby improving the accuracy of optical power measurement, i.e., improving the precision of optical power measurement.

[0068] In one embodiment of this application, such as Figure 4As shown, the plurality of through holes 1062 includes M first through holes 1064 located in the first region 108, N second through holes 1066 located in the second region 110, and N third through holes 1068 located in the third region 112. The third region 112 surrounds the second region 110, and the center of the third region 112 coincides with the center of the aperture stop 106, that is, the third region 112 is an annular region including the second region 110. The third through holes 1068 correspond one-to-one with the second through holes 1066, and the line connecting the third through hole 1068 and the corresponding second through hole 1066 passes through the center of the aperture stop 106, that is, the line connecting the corresponding third through hole 1068, the second through hole 1066, and the first through hole 1064 passes through the center of the aperture stop 106.

[0069] The first through-hole 1064 and the second through-hole 1066 are separated by a third distance d1, and the second through-hole 1066 and its corresponding third through-hole 1068 are separated by a fourth distance d1, where the third distance d1 equals the fourth distance d1. Similarly, the multiple through-holes 1062 can also include N fourth through-holes located in the fourth region, N fifth through-holes located in the fifth region, and so on. The line connecting the corresponding through-holes passes through the center of the aperture 106. It should be noted that the third and fourth distances can be different, and correspondingly, the distances between the outermost through-holes and their corresponding through-holes in adjacent regions can also be different, depending on the specific circumstances. It should be noted that the distance between the first through-hole 1064 and the second through-hole 1066 refers to the straight-line distance between the center of the first through-hole 1064 and the center of the second through-hole 1066, and the distance between the second through-hole 1066 and the third through-hole 1068 refers to the straight-line distance between the center of the second through-hole 1066 and the center of the third through-hole 1068.

[0070] In one embodiment of this application, such as Figure 4As shown, the aperture 106 includes 17 through holes 1062, which are circular with M=1 and N=8. That is, the aperture 106 includes a first through hole 1064 located at its center, eight second through holes 1066 located in the second region 110, and eight third through holes 1068 located in the third region 112. In the clockwise direction, the angle between any two adjacent second through holes and the corresponding first through hole is 45°. That is, the angle between any two adjacent corresponding third through holes 1068, second through holes 1066, and first through holes 1064 is 45°. If one of the N second through holes 1066 is taken as the first second through hole 1066, and the first second through hole 1066 is regarded as being located at 0° in the center of the aperture 106, then in the direction of the second region surrounding the first region 108, the second to eighth second through holes 1066 are distributed in the directions of 45°, 90°, 135°, 180°, 225°, 270°, and 315° in the direction of the aperture 106. In other words, the second through holes 1066 are evenly distributed in the direction of the second region surrounding the first region 108. Since the third through-hole 1068 corresponds one-to-one with the second through-hole 1066, the third through-hole 1068 is uniformly distributed in the direction surrounding the second region 110, and the distribution pattern is the same as that of the second through-hole 1066. Therefore, the multiple through-holes 1062 in the aperture 106 are uniformly and regularly distributed, so that the images formed by the multiple through-holes 1062 in the detection image after projection by the lens under test 1 are uniformly distributed and regular, facilitating the calculation of the optical power of the lens under test 1 based on the images of the multiple through-holes 1062 in the detection image.

[0071] The third and fourth distances mentioned above are d1. Along the first direction, the distance between the first imaging element 204 and the lens 1 under test is L1, and the distance between the beam splitter element 202 and the lens 1 under test is L2. Along the second direction, the distance between the second imaging element 206 and the beam splitter element 202 is L3.

[0072] In the first image, there is a fifth distance between the image of the first through-hole 1064 and the image of the second through-hole 1066, and a sixth distance between the image of the second through-hole 1066 and the image of the third through-hole 1068. The fifth and sixth distances are equal, both being d2. In the second image, there is a seventh distance between the image of the first through-hole 1064 and the image of the second through-hole 1066, and an eighth distance between the image of the second through-hole 1066 and the image of the third through-hole 1068. The seventh and eighth distances are equal, both being d3.

[0073] The lens under test 1 is a first type of lens. The processing element obtains the optical power D1 of the lens under test 1 based on the first image, D1=1000×(d1-d2) / (d1×L1), and / or, the processing element obtains the optical power D2 of the lens under test 1 based on the second image, D2=1000×(d1-d3) / (d1×(L2+L3)).

[0074] The lens under test 1 is a second type of lens. The processing element obtains the optical power D3 of the lens under test based on the first image and the second image, and D2=1000×(d2-d3) / (d1×(L2+L3-L1)).

[0075] The thickness of the first type of lens is greater than that of the second type of lens. The first type of lens can be the thin lens mentioned above, and the second type of lens can be the thick lens mentioned above.

[0076] In one embodiment of this application, such as Figure 6 As shown, Figure 6 The diagram shows the structure of the beam expander 1042. The beam expander 1042 includes a first beam expander lens 1046 and a second beam expander lens 1048 arranged along a first direction. The second beam expander lens 1048 is located between the first beam expander lens 1046 and the collimating element 1044, that is, the second beam expander lens 1048 is located on the side closer to the collimating element 1044.

[0077] The first beam expander lens 1046 can be a meniscus lens with positive refractive index, and the side of the first beam expander lens 1046 facing the light-emitting element 102 is a concave surface that is recessed inward, and the other side is a convex surface that is convex outward. The second beam expander lens 1048 is a biconvex lens with positive refractive index.

[0078] In one embodiment of this application, such as Figure 7 As shown, Figure 7 The collimating element 1044 includes a first collimating lens 1050 and a second collimating lens 1052 arranged along a first direction. The first collimating lens 1050 is located between the beam expander element 1042 and the second collimating lens 1052, and the second collimating lens 1052 is located between the first collimating lens 1050 and the aperture 106.

[0079] The first collimating lens 1050 is a plano-convex lens with a positive refractive index. The side of the first collimating lens 1050 facing the beam expander 1042 has an outwardly convex surface, while the other side is a flat surface. Or, as... Figure 8 As shown, the first collimating lens 1050 is a plano-concave lens with a negative refractive index. The side of the first collimating lens 1050 facing the beam expanding element 1042 is a concave surface that is recessed inward, and the other side is a plane.

[0080] The second collimating lens 1052 is a plano-convex lens with positive refractive index. The side of the second collimating lens 1052 facing the first collimating lens 1050 is a plane, and the other side is a convex surface that bulges outward.

[0081] In one embodiment of this application, the light-emitting element 102 may be an LED light-emitting element, but this application does not limit it and it depends on the specific situation.

[0082] The first imaging element 204 is an imaging CMOS chip, and the second imaging element 206 is an imaging CMOS chip, but this application does not limit this and it depends on the specific circumstances.

[0083] In one embodiment of this application, the beam-splitting element 202 includes a beam-splitting prism and a beam-splitting film located on the beam-splitting surface of the beam-splitting prism, wherein the beam-splitting film is a 50% beam-splitting film. It should be noted that the beam-splitting surface of the beam-splitting prism is typically facing the side of the lens 1 under test, and the beam-splitting film being a 50% beam-splitting film means that the measurement beam can be split into two identical beams that propagate in different directions.

[0084] Specifically, the measurement beam is transmitted to the beam-splitting surface of the beam-splitting prism, and a first detection beam and a second measurement beam are formed by the beam-splitting film, and the light intensities of the first measurement beam and the second measurement beam can be equal.

[0085] Based on the optical power measurement system described in any of the above embodiments, the light-emitting element 102 is an LED lighting chip with a wavelength of 555nm and an illuminance of 300lm. The beam expander 1042 in the collimator 104 includes a meniscus lens made of BK7 with a positive refractive index, and a biconvex lens made of BK7 with a positive refractive index. The collimating element 1044 in the collimator 104 employs two types of collimating lenses: the first type includes a plano-convex lens made of BK7 with a positive refractive index; the second type includes a plano-concave lens made of BK7 with a negative refractive index, and a plano-convex lens made of BK7 with a positive refractive index. The aperture 106 is a high-precision aperture including multiple through holes 1062, and the aperture 106 is fixed to the collimating element 1044 by threads. The beam-splitting prism in beam-splitting element 202 is made of BK7 material, and the beam-splitting surface has a 50% beam-splitting film. The first imaging element 204 and the second imaging element 206 are the same type of chip, the main ray incident angle of the chip can be 0°~9°, the chip resolution can be 8 megapixels, and the chip size can be 8mm*8mm.

[0086] To gain a clearer understanding of the optical power measurement system provided in this application, the working process and calculation process of the measurement system are described below. The calculation process of this measurement system can also be regarded as the working process of the processing element.

[0087] The work process is as follows:

[0088] When measuring optical power using this measurement system, the light-emitting element 102 first emits a light source beam. The light source beam is sequentially expanded by the beam expander 1042 and collimated by the collimator 1044 to form a parallel initial beam. The initial beam is transmitted to the lens under test 1 through the high-precision aperture 106. After passing through the lens under test 1, a measurement beam with a converging or diverging effect is generated. The measurement beam is split by the beam splitter 102 to form a first measurement beam and a second measurement beam, which are respectively received by the first imaging element 204 and the second imaging element 206 to form a first image and a second image. The processing element can obtain the optical power of the lens under test 1 based on at least one of the first image and the second image.

[0089] The calculation process is as follows:

[0090] like Figure 8 As shown, Step 1: Acquire the first image formed by the first imaging element 204, and use a portion of the light spot image formed by the through-hole 1062 in the first image as marker points, and obtain the distance d1 between the marker points. Step 2: Acquire the second image formed by the second imaging element 206, and use a portion of the light spot image formed by the through-hole 1062 in the second image as marker points, and obtain the distance d1 between the marker points. Step 3: Use bicubic interpolation, followed by thresholding, and then perform connected component selection data processing. Step 4: Take the center of the dot, which is the center of the light spot image formed by the through-hole 1062 in the first and second images, and calculate the centroid of the light spot image formed by the through-hole 1062 in the first and second images using the gray-scale centroid method. Calculate the distance between the centroids of the light spot images formed in the first and second images. Step 5: Based on the distance between the centroids of the light spot images formed in the first and second images, the optical power of the lens under test 1 can be calculated using the aforementioned optical power calculation formula. The optical power value range can be ±25D.

[0091] Based on the optical power measurement system described in any of the above embodiments, this application also provides an optical power measurement device, which includes the optical power measurement system described in any of the above embodiments.

[0092] The various embodiments in this specification are described in a progressive, parallel, or combined manner. Each embodiment focuses on its differences from other embodiments, and similar or identical parts between embodiments can be referred to interchangeably. For the apparatuses disclosed in the embodiments, since they correspond to the methods disclosed in the embodiments, the descriptions are relatively simple, and relevant parts can be referred to the method section.

[0093] It should be noted that, in the description of this application, the terms "upper," "lower," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. When a component is considered to be "connected" to another component, it can be directly connected to the other component or there may be a component centrally located at the same time.

[0094] It should also be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that an article or apparatus comprising a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such an article or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the article or apparatus that includes the aforementioned element.

[0095] The above description of the disclosed embodiments enables those skilled in the art to make or use this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A system for measuring optical power, characterized in that, include: A light source module that forms an initial light beam; A measurement module is located on the transmission path of the initial beam. The lens under test is placed between the light source module and the measurement module, and closer to the measurement module. The measurement module includes a beam splitting element, a first imaging element, a second imaging element, and a processing element. The beam splitter splits the initial beam into a measurement beam formed by the lens under test, creating a first measurement beam and a second measurement beam. The first measurement beam is transmitted along a first direction to the first imaging element to form a first image, and the second measurement beam is transmitted along a second direction to the second imaging element to form a second image. The first direction is parallel to the transmission direction of the measurement beam, and the first and second directions intersect. Along the first direction, there is a first distance between the first imaging element and the beam splitter; along the second direction, there is a second distance between the second imaging element and the beam splitter. The first distance and the second distance are not equal. The processing element obtains the optical power of the lens under test based on at least one of the first image and the second image.

2. The optical power measurement system according to claim 1, characterized in that, The light source module includes a light-emitting element, a collimator, and an aperture. The collimator includes a beam expander and a collimator. The light-emitting element emits a light beam, and the beam expander, the collimator, and the aperture are arranged sequentially along the transmission direction of the light beam. The light beam passes through the beam expander, the collimator, and the aperture in sequence to form the initial beam. The transmission directions of the light source beam and the initial beam are parallel to the first direction.

3. The optical power measurement system according to claim 2, characterized in that, The aperture includes multiple through holes of the same diameter, and the multiple through holes include at least M first through holes located in a first region and N second through holes located in a second region; the first region is the middle region of the aperture, the second region surrounds the first region, the centers of the first region and the second region coincide with the center of the aperture, and the line connecting the first through holes and the second through holes passes through the center of the aperture; Where M=1, N≥1, and the first through hole is located at the center of the first region; or M=N, N>1, the first through holes are arranged sequentially along the direction surrounding the center of the aperture, and the second through holes correspond one-to-one with the first through holes.

4. The optical power measurement system according to claim 3, characterized in that, The plurality of through holes includes M first through holes located in the first region, N second through holes located in the second region, and N third through holes located in the third region. The third region surrounds the second region, and the center of the third region coincides with the center of the aperture. The third through holes correspond one-to-one with the second through holes, and the line connecting the third through hole and the corresponding second through hole passes through the center of the aperture. There is a third distance between the first through hole and the second through hole, and a fourth distance between the second through hole and the corresponding third through hole, wherein the third distance is equal to the fourth distance.

5. The optical power measurement system according to claim 4, characterized in that, The aperture includes 17 through holes, which are circular, M=1, N=8, and in the direction surrounding the first region in the second region, the angle between any two adjacent lines connecting the second through holes and the corresponding first through holes is 45°. The third distance and the fourth distance are d1; along the first direction, the distance between the first imaging element and the lens under test is L1, and the distance between the beam splitter and the lens under test is L2; Along the second direction, the distance between the second imaging element and the beam splitter element is L3; in the first image, there is a fifth distance between the image of the first through-hole and the image of the second through-hole, and a sixth distance between the image of the second through-hole and the image of the third through-hole, the fifth distance and the sixth distance are equal, both being d2; in the second image, there is a seventh distance between the image of the first through-hole and the image of the second through-hole, and an eighth distance between the image of the second through-hole and the image of the third through-hole, the seventh distance and the eighth distance are equal, both being d3; The lens under test is a first type of lens. The processing element obtains the optical power D1 of the lens under test based on the first image, where D1 = 1000 × (d1 - d2) / (d1 × L1), and / or, the processing element obtains the optical power D2 of the lens under test based on the second image, where D2 = 1000 × (d1 - d3) / (d1 × (L2 + L3)). The lens under test is a second type of lens. The processing element obtains the optical power D3 of the lens under test based on the first image and the second image, where D3 = 1000 × (d2 - d3) / (d1 × (L2 + L3 - L1)). The thickness of the first type of lens is greater than the thickness of the second type of lens.

6. The optical power measurement system according to claim 2, characterized in that, The beam expanding element includes a first beam expanding lens and a second beam expanding lens arranged along the first direction, with the second beam expanding lens located between the first beam expanding lens and the collimating element. The first beam expander lens is a meniscus lens with positive refractive index, and the side of the first beam expander lens facing the light-emitting element is a concave surface that is recessed inward, and the other side is a convex surface that is convex outward. The second beam expander is a biconvex lens with a positive refractive index.

7. The optical power measurement system according to claim 2, characterized in that, The collimating element includes a first collimating lens and a second collimating lens arranged along the first direction. The first collimating lens is located between the beam expanding element and the second collimating lens, and the second collimating lens is located between the first collimating lens and the aperture. The first collimating lens is a plano-convex lens with a positive refractive index, wherein the side of the first collimating lens facing the beam expanding element is a convex surface that bulges outward, and the other side is a plane; or, the first collimating lens is a plano-concave lens with a negative refractive index, wherein the side of the first collimating lens facing the beam expanding element is a concave surface that bulges inward, and the other side is a plane. The second collimating lens is a plano-convex lens with a positive refractive index. The side of the second collimating lens facing the first collimating lens is a plane, and the other side is a convex surface that bulges outward.

8. The optical power measurement system according to claim 2, characterized in that, The light-emitting element is an LED light-emitting element; The first imaging element is an imaging CMOS chip, and the second imaging element is an imaging CMOS chip.

9. The optical power measurement system according to claim 1, characterized in that, The beam-splitting element includes a beam-splitting prism and a beam-splitting film located on the beam-splitting surface of the beam-splitting prism, wherein the beam-splitting film is a 50% beam-splitting film; The measurement beam is transmitted to the beam-splitting surface of the beam-splitting prism, and forms the first measurement beam and the second measurement beam through the beam-splitting film. The light intensities of the first measurement beam and the second measurement beam are equal.

10. A photometric power measuring device, characterized in that, Includes the optical power measurement system according to any one of claims 1-9.

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