Reflection-type large-aperture eccentric meter
By designing the optical path structure of a reflective large-aperture eccentricity meter and utilizing the combined reflection of the first and second spherical mirrors, the problem of eccentricity detection of large-center-aperture lenses in existing technologies has been solved, and effective eccentricity detection of large-aperture lenses has been achieved.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- HANGZHOU ZHIDA OPTOELECTRONICS CO LTD
- Filing Date
- 2025-05-19
- Publication Date
- 2026-05-05
AI Technical Summary
Existing reflective eccentricity meters cannot detect eccentricity of lenses with large central holes because all light passes through the central hole and cannot be reflected on the test surface of the lens.
The optical path design includes a first spherical mirror and a second spherical mirror. Through two reflections, the reflected light converges on the optical axis, ensuring that the light can illuminate the test surface of the lens under test. It works in conjunction with an illumination lens group, a cross reticle, a semi-reflective prism, a collimating lens group, and an imaging lens group to perform eccentricity detection.
It enables the detection of eccentricity in lenses with large central holes, improving the adaptability and accuracy of the test, and is applicable to different types of lenses.
Smart Images
Figure CN224202713U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the technical field of reflective eccentricity, specifically to a reflective large-diameter eccentricity. Background Technology
[0002] A reflective eccentricity meter is a commonly used instrument for measuring the eccentricity of lenses or other optical components. Eccentricity refers to the misalignment of the geometric central axis of an optical component with its optical principal axis. The working principle of eccentricity detection is as follows: light is shone onto the surface of the lens under test, and the reflection of the light from the surface is observed to determine whether the lens is eccentric. However, some lenses have a central aperture. When the diameter of the central aperture is large (e.g., greater than or equal to 30 mm), existing reflective eccentricity meters are no longer able to detect eccentricity because the light generated by the reflective eccentricity meter will pass entirely through the central aperture of the lens and will not be reflected from the surface of the lens under test. Utility Model Content
[0003] This invention addresses the problems existing in the prior art by proposing a reflective large-aperture eccentricity meter, which can detect the eccentricity of a lens with a large-aperture central hole.
[0004] This utility model is achieved through the following technical solution:
[0005] A reflective large-aperture eccentricity includes a light source, an illumination lens group, a crosshair reticle, a semi-reflective prism, a collimating lens group, a first spherical mirror, and a second spherical mirror arranged sequentially along the optical axis.
[0006] The concave surface of the first spherical mirror faces the convex surface of the second spherical mirror, and the first spherical mirror has a central through-hole that allows the outgoing parallel light from the collimating lens group to pass through.
[0007] The convex surface of the second spherical mirror reflects the collimating lens group outgoing parallel light for the first time to obtain primary reflected light, and the concave surface of the first spherical mirror reflects the primary reflected light for the second time to obtain secondary reflected light. The secondary reflected light can converge on the optical principal axis to obtain the light convergence point.
[0008] When the lens under test is positioned between the second spherical mirror and the light convergence point, the center of the radius of curvature of the measured surface of the lens under test coincides with the light convergence point, and at least part of the secondary reflected light can illuminate the measured surface of the lens under test.
[0009] Preferably, the concave radius of curvature of the first spherical mirror is a*200mm and the diameter of the concave aperture is a*80mm, the convex radius of curvature of the second spherical mirror is a*30mm and the diameter of the convex aperture is a*30mm, and the initial distance between the first and second spherical mirrors is a*100mm, where a is a multiple.
[0010] Preferably, the first spherical mirror has a concave surface curvature radius of 200mm and a concave surface aperture diameter of 80mm, the second spherical mirror has a convex surface curvature radius of 30mm and a convex surface aperture diameter of 30mm, and the initial distance between the first and second spherical mirrors is 100mm.
[0011] Preferably, the distance between the first spherical reflector and the second spherical reflector is adjustable, and the adjustable range is 85-105mm.
[0012] Preferably, the second spherical reflector is mounted on the sliding guide rail.
[0013] Preferably, the illumination lens group includes a plano-convex lens 1, a plano-convex lens 2, a plano-convex lens 3, and a plano-convex lens 4 arranged sequentially along the optical axis. The convex surface of the plano-convex lens 1 faces and is in close contact with the convex surface of the plano-convex lens 2, and the convex surface of the plano-convex lens 3 faces and is in close contact with the convex surface of the plano-convex lens 4.
[0014] Preferably, the collimating lens group includes a first sub-lens group and a second sub-lens group; the first sub-lens group includes a meniscus lens one and a plano-concave lens arranged sequentially along the optical axis; the second sub-lens group includes a meniscus lens two and a biconvex lens arranged sequentially along the optical axis.
[0015] As a preferred embodiment, the reflective large-aperture eccentric instrument also includes a beam splitter configured in conjunction with a semi-reflective and semi-transparent prism, as well as a reticle, an imaging lens group, and a charge-coupled device configured in conjunction with the beam splitter.
[0016] Preferably, the imaging lens group includes a first biconvex lens, a biconcave lens, and a second biconvex lens arranged sequentially along the optical axis.
[0017] As a preferred embodiment, the reflective large-aperture eccentric instrument also includes an eyepiece that works in conjunction with the beam splitter.
[0018] In summary, this utility model has the following beneficial effects:
[0019] This invention relates to a large-aperture reflective eccentricity meter, which includes a first spherical reflector and a second spherical reflector. The convex surface of the second spherical reflector reflects the collimating lens group's outgoing parallel light for the first time to obtain primary reflected light, while the concave surface of the first spherical reflector reflects the primary reflected light for the second time to obtain secondary reflected light. The secondary reflected light converges on the optical axis to obtain a light convergence point. When the center of the radius of curvature of the measured surface of the lens coincides with the light convergence point, even if the measured lens has a large-aperture central hole, some secondary reflected light will still illuminate the measured surface of the lens, thus enabling the large-aperture reflective eccentricity meter to detect eccentricity of lenses with large-aperture central holes.
[0020] Further or more detailed beneficial effects will be described in conjunction with specific embodiments in the detailed implementation. Attached Figure Description
[0021] Figure 1 This is a schematic diagram of the structure of a large-diameter reflective eccentricity instrument according to this utility model;
[0022] Figure 2 yes Figure 1 A schematic diagram of the structure of a medium-reflection large-aperture eccentric meter after the lens under test is installed;
[0023] Figure 3 yes Figure 2 A magnified view of a medium-reflection large-aperture eccentric meter;
[0024] Figure 4 yes Figure 3 A magnified view of a medium-reflection large-aperture eccentric meter;
[0025] Figure 5 yes Figure 3 Another enlarged view of a medium-reflection large-diameter eccentric instrument. Detailed Implementation
[0026] The present invention will be further described in detail below with reference to the accompanying drawings.
[0027] This specific embodiment is merely an explanation of the present utility model and is not intended to limit the present utility model. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but as long as they are within the scope of the claims of the present utility model, they are protected by patent law.
[0028] like Figures 1 to 3 As shown, this embodiment discloses a reflective large-aperture eccentricity meter, including a light source 1, an illumination lens group 2, a cross reticle 3, a semi-reflective prism 4, a collimating lens group, a first spherical reflector 7, and a second spherical reflector 8 arranged sequentially along the optical axis.
[0029] The concave surface of the first spherical mirror 7 faces the convex surface of the second spherical mirror 8, and the first spherical mirror 7 has a central through hole that allows the outgoing parallel light from the collimating lens group to pass through.
[0030] The convex surface of the second spherical mirror 8 reflects the collimating lens group's outgoing parallel light for the first time to obtain primary reflected light. The concave surface of the first spherical mirror 7 reflects the primary reflected light for the second time to obtain secondary reflected light. The secondary reflected light can converge on the optical principal axis to obtain the light convergence point S.
[0031] When the lens under test 9 is positioned between the second spherical mirror 8 and the light convergence point S, the center of the radius of curvature of the surface under test of the lens under test 9 coincides with the light convergence point S, and at least part of the secondary reflected light can illuminate the surface under test of the lens under test 9.
[0032] In this embodiment, the light source 1 is an LED white light. The crosshair reticle 3 is positioned at the exit pupil of the illumination lens group 2 and at the focal point of the collimating lens group, so that the light generated by the light source 1 becomes a parallel beam after passing through the illumination lens group 2, the crosshair reticle 3, the semi-reflective prism 4, and the collimating lens group. The parallel light emitted from the collimating lens group passes through the central through-hole of the first spherical mirror 7 and illuminates the convex surface of the second spherical mirror 8. The aperture of the central through-hole of the first spherical mirror 7 can be 10mm. If the aperture is too large, the aberration will also increase, thus affecting the overall imaging effect.
[0033] The convex surface of the second spherical mirror 8 reflects the parallel light emitted from the collimating lens group onto the concave surface of the first spherical mirror 7, thus diffusing the light to a specific aperture. The concave surface of the first spherical mirror 7 then reflects the light reflected from the second spherical mirror 8 again, thus converging the light. In summary, the combination of the first spherical mirror 7 and the second spherical mirror 8 achieves a large-aperture converging light effect. That is, when the center of the radius of curvature of the measured surface of the lens 9 coincides with the light convergence point S, even if the lens 9 has a large-aperture central aperture, some of the reflected light from the first spherical mirror 7 will still illuminate the measured surface of the lens 9. This allows the eccentricity tester of this embodiment to perform eccentricity detection on lenses with large-aperture central apertures.
[0034] Furthermore, in this embodiment, the concave radius of curvature of the first spherical mirror 7 is a*200mm, and the diameter of the concave aperture is a*80mm; the convex radius of curvature of the second spherical mirror 8 is a*30mm, and the diameter of the convex aperture is a*30mm; and the initial distance between the first spherical mirror 7 and the second spherical mirror 8 is a*100mm, where a is a multiple. a can be any value such as 0.5, 1, 2, etc.
[0035] When a equals 1, the concave radius of curvature of the first spherical mirror 7 is 200mm, and the diameter of its concave aperture is 80mm. The convex radius of curvature of the second spherical mirror 8 is 30mm, and the diameter of its convex aperture is 30mm. The initial distance between the first spherical mirror 7 and the second spherical mirror 8 is 100mm. At this time, the overall focal length of the first spherical mirror 7 and the second spherical mirror 8 is 100mm, and the overall working distance (i.e., the distance from the second spherical mirror 8 to the light convergence point S) is 620mm.
[0036] When the radius of curvature of the measured surface of the lens 9 is 600mm, the lens 9 can be positioned between the second spherical mirror 8 and the light convergence point S, with a distance of 20mm between the lens 9 and the second spherical mirror 8. At this time, the maximum measurable aperture is 60mm. Therefore, as long as the diameter of the central hole of the lens 9 is less than 60mm, the eccentricity detector of this embodiment can detect its eccentricity. That is, when the radius of curvature of the concave surface of the first spherical mirror 7 is 200mm and the diameter of the concave aperture is 80mm, and the radius of curvature of the convex surface of the second spherical mirror 8 is 30mm and the diameter of the convex aperture is 30mm, and the initial distance between the first spherical mirror 7 and the second spherical mirror 8 is 100mm, if the radius of curvature of the measured surface of the lens 9 is 600mm, then even if the diameter of the central hole of the lens 9 is large (greater than or equal to 30mm), the eccentricity detector of this embodiment can still detect its eccentricity.
[0037] When the radius of curvature of the measured surface of the lens 9 is 610 mm, the lens 9 can be positioned between the second spherical mirror 8 and the light convergence point S, with a distance of 10 mm between the lens 9 and the second spherical mirror 8. At this time, the maximum measurable aperture is still 60 mm. Therefore, as long as the diameter of the central hole of the lens 9 is less than 60 mm, the eccentricity detector of this embodiment can detect its eccentricity. That is, when the radius of curvature of the concave surface of the first spherical mirror 7 is 200 mm and the diameter of the concave aperture is 80 mm, and the radius of curvature of the convex surface of the second spherical mirror 8 is 30 mm and the diameter of the convex aperture is 30 mm, and the initial distance between the first spherical mirror 7 and the second spherical mirror 8 is 100 mm, if the radius of curvature of the measured surface of the lens 9 is 610 mm, then even if the diameter of the central hole of the lens 9 is large (greater than or equal to 30 mm), the eccentricity detector of this embodiment can still detect its eccentricity.
[0038] When the radius of curvature of the measured surface of the lens 9 is 300mm, the lens 9 can be positioned between the second spherical mirror 8 and the light convergence point S, with a distance of 320mm between the lens 9 and the second spherical mirror 8. At this time, the maximum measurable aperture is 30mm. Therefore, as long as the diameter of the central hole of the lens 9 is less than 30mm, the eccentricity detector of this embodiment can detect eccentricity. That is, when the radius of curvature of the concave surface of the first spherical mirror 7 is 200mm and the diameter of the concave aperture is 80mm, and the radius of curvature of the convex surface of the second spherical mirror 8 is 30mm and the diameter of the convex aperture is 30mm, and the initial distance between the first spherical mirror 7 and the second spherical mirror 8 is 100mm, if the radius of curvature of the measured surface of the lens 9 is 300mm, then even if the diameter of the central hole of the lens 9 is relatively large (e.g., slightly less than 30mm), the eccentricity detector of this embodiment can still detect eccentricity.
[0039] In theory, as long as the lens 9 with a larger central aperture can be placed between the second spherical mirror 8 and the light convergence point S (of course, the center of the radius of curvature of the measured surface of the lens 9 needs to coincide with the light convergence point S), and at least part of the reflected light from the first spherical mirror 7 can illuminate the measured surface of the second spherical mirror 8, then regardless of the concave radius of curvature and concave aperture diameter of the first spherical mirror 7, the convex radius of curvature and convex aperture diameter of the second spherical mirror 8, or the initial distance between the first spherical mirror 7 and the second spherical mirror 8, the eccentricity meter in this embodiment can perform eccentricity detection on the lens 9 with a larger central aperture.
[0040] However, considering the difficulty of eccentricity detection operations and the production cost of the eccentricity meter, this embodiment can set the concave radius of curvature and concave aperture diameter of the first spherical mirror 7, the convex radius of curvature and convex aperture diameter of the second spherical mirror 8, and the initial distance between the first and second spherical mirrors 7 and 8 to optimal fixed values. For example, the concave radius of curvature of the first spherical mirror 7 is 200mm, the concave aperture diameter is 80mm, the convex radius of curvature of the second spherical mirror 8 is 30mm, the convex aperture diameter is 30mm, and the initial distance between the first and second spherical mirrors 7 and 8 is 100mm. In this case, as long as the radius of curvature of the measured surface of the lens 9 is greater than or equal to 300mm and less than 620mm, the eccentricity meter of this embodiment can detect eccentricity even if the central hole of the lens 9 is large.
[0041] Furthermore, the distance between the first spherical reflector 7 and the second spherical reflector 8 is adjustable, with an adjustable range of 85-105mm. The second spherical reflector 8 is mounted on a sliding guide rail, making its movement and adjustment more convenient.
[0042] In this embodiment, the position of the second spherical mirror 8 can be moved along the optical principal axis, allowing the distance between the first spherical mirror 7 and the second spherical mirror 8 to vary. The initial distance between the first spherical mirror 7 and the second spherical mirror 8 is 100mm, and the second spherical mirror 8 can be moved to the left along the optical principal axis (in...). Figure 1 From a certain angle, the minimum distance between the first spherical mirror 7 and the second spherical mirror 8 is 85mm; the second spherical mirror 8 can also move to the right along the optical principal axis (in... Figure 1 (From the perspective of viewing angle), the maximum distance between the first spherical mirror 7 and the second spherical mirror 8 is 105mm.
[0043] When the distance between the first spherical mirror 7 and the second spherical mirror 8 is 85mm, the overall focal length of the first spherical mirror 7 and the second spherical mirror 8 is infinite, and the overall working distance can reach 10000mm. The secondary reflected light generated by the first spherical mirror 7 is parallel to the optical principal axis. Although the secondary reflected light cannot converge on the optical principal axis to obtain the light convergence point S, meaning the eccentricity meter cannot be used to detect the eccentricity of the lens 9 with a large-diameter central hole, it can be used to measure the parallelism of lenses with a flat surface. If the distance between the first spherical mirror 7 and the second spherical mirror 8 is less than 85mm, the secondary reflected light will diverge and cannot converge, making the eccentricity meter unusable.
[0044] When the distance between the first spherical mirror 7 and the second spherical mirror 8 is 105mm, the overall focal length of the first spherical mirror 7 and the second spherical mirror 8 is 75mm, and the overall working distance is 500mm. If the distance between the first spherical mirror 7 and the second spherical mirror 8 is greater than 105mm, the secondary reflected light will converge onto the second spherical mirror 8, which will also cause the eccentricity to malfunction.
[0045] If the radius of curvature of the measured surface of the lens 9 is not greater than or equal to 300 mm and less than 620 mm, for example, when the radius of curvature of the measured surface of the lens 9 is 700 mm, then the position of the second spherical mirror 8 can be moved so that the distance between the first spherical mirror 7 and the second spherical mirror 8 decreases from 100 mm, thereby increasing the overall working distance (i.e., the distance from the second spherical mirror 8 to the light convergence point S) from 620 mm. As long as the overall working distance is greater than the radius of curvature of the measured surface of the lens 9, for example, the overall working distance can be adjusted to 705 mm. At this time, the lens 9 can be placed between the second spherical mirror 8 and the light convergence point S, and the center of the radius of curvature of the measured surface of the lens 9 can coincide with the light convergence point S. Furthermore, at this time, the maximum measurable aperture of the eccentricity meter is 60 mm.
[0046] If the radius of curvature of the measured surface of the lens 9 is 300mm, but the diameter of the central hole of the lens 9 is greater than or equal to 30mm, then the position of the second spherical mirror 8 can be moved so that the distance between the first spherical mirror 7 and the second spherical mirror 8 increases from 100mm, thereby reducing the overall working distance (i.e., the distance from the second spherical mirror 8 to the light convergence point S) from 620mm. This is acceptable as long as the overall working distance is greater than the radius of curvature of the measured surface of the lens 9; for example, the overall working distance can be adjusted to 550mm. At this point, the lens 9 can be placed between the second spherical mirror 8 and the light convergence point S, and the center of the radius of curvature of the measured surface of the lens 9 coincides with the light convergence point S. Furthermore, at this point, the maximum measurable aperture of the eccentricity meter is greater than 30mm.
[0047] If the radius of curvature of the surface being measured of the lens 9 is slightly less than 300mm, the position of the second spherical mirror 8 can be moved so that the distance between the first spherical mirror 7 and the second spherical mirror 8 increases from 100mm.
[0048] In summary, under the premise that the concave radius of curvature of the first spherical mirror 7 is 200mm and the diameter of the concave aperture is 80mm, the convex radius of curvature of the second spherical mirror 8 is 30mm and the diameter of the convex aperture is 30mm, and the initial distance between the first spherical mirror 7 and the second spherical mirror 8 is 100mm, the second spherical mirror 8 is made movable. This setting allows the distance between the first spherical mirror 7 and the second spherical mirror 8 to be adjusted within the range of 85-105mm, thereby enabling more types of lenses 9 to be tested to be used by the eccentricity tester of this embodiment for eccentricity detection, ultimately improving the adaptability of the eccentricity tester of this embodiment.
[0049] Furthermore, if the radius of curvature of the measured surface of the lens 9 is small or large, and the eccentricity meter with a value of 1 can no longer perform eccentricity detection effectively, then it is necessary to replace it with a different model of first spherical mirror 7 and second spherical mirror 8 with a value of other values. For example, when the radius of curvature of the measured surface of the lens 9 is 1200mm, then a can be 2. In this case, the radius of curvature of the concave surface of the first spherical mirror 7 is 400mm, and the diameter of the concave aperture is 160mm. The radius of curvature of the convex surface of the second spherical mirror 8 is 60mm, and the diameter of the convex aperture is 60mm. The initial distance between the first spherical mirror 7 and the second spherical mirror 8 is 200mm.
[0050] Furthermore, such as Figure 4As shown, the illumination lens group 2 in this embodiment includes a plano-convex lens 2-1, a plano-convex lens 2-2, a plano-convex lens 2-3, and a plano-convex lens 2-4 arranged sequentially along the optical axis. The convex surface of the plano-convex lens 2-1 faces and is in close contact with the convex surface of the plano-convex lens 2-2, and the convex surface of the plano-convex lens 2-3 faces and is in close contact with the convex surface of the plano-convex lens 2-4.
[0051] The illumination lens group 2 of this structure can improve the uniformity of light from the light source 1.
[0052] Furthermore, such as Figure 5 As shown, the collimating lens group in this embodiment includes a first sub-lens group 5 and a second sub-lens group 6; the first sub-lens group 5 includes a meniscus lens 5-1 and a plano-concave lens 5-2 arranged sequentially along the optical axis; the second sub-lens group 6 includes a meniscus lens 6-1 and a biconvex lens 6-2 arranged sequentially along the optical axis.
[0053] The first sub-lens group 5 uses two lenses separated in the middle, with the concave surface of the meniscus lens 5-1 facing to the right (in... Figure 5 From a certain angle, the concave surface of the plano-concave lens 5-2 faces to the left (in...). Figure 5 (From a certain perspective), because the radii of curvature of the meniscus lens 5-1 and the plano lens 5-2 differ significantly, the first sub-lens group 5 of this structure can improve the overall resolution of the first sub-lens group 5, while also reducing the generation of ghost images (when light passes through one or more lenses, some light rays may be reflected in front of and behind the lenses. These reflected rays may be reflected again by other lens surfaces and eventually form an image on the imaging plane. This unexpected image caused by internal reflection is usually darker than the original image and is located differently from the original image; they are called ghost images).
[0054] The second sub-lens group 6 is a cemented lens group, and the aperture diameter of the second sub-lens group 6 is 32mm.
[0055] Furthermore, the reflective large-aperture eccentric instrument of this embodiment also includes a beam splitter 10 configured in conjunction with the semi-reflective and semi-transparent prism 4, a reticle 12, an imaging lens group 13 and a charge-coupled device 14 configured in conjunction with the beam splitter 10, and an eyepiece 11 configured in conjunction with the beam splitter 10.
[0056] The specific principle of eccentricity detection is as follows:
[0057] Without the lens under test 9, the cross image of the cross reticle 3, after being illuminated by the light source 1 and the illumination lens group 2, can form a cross image at the light convergence point S. When the lens under test 9 is set, the cross image is reflected by the surface under test of the lens under test 9, and then the cross image returns along the original path to the semi-reflective prism 4 (that is, it is first reflected to the concave surface of the first spherical mirror 7, then reflected to the convex surface of the second spherical mirror 8, then passes back through the central through-hole of the first spherical mirror 7, and finally returns to the semi-reflective prism 4 through the collimating lens group). Then the cross image is reflected by the semi-reflective prism 4 to the beam splitter 10. The beam splitter 10 divides the cross image into two groups. One group is imaged onto the eyepiece 11 for easy observation with the naked eye; the other group is imaged onto the reticle 12 (the reticle has gradations, similar to a ruler, with each gradation spaced 0.1 mm apart, allowing the movement distance of the cross image to be read from the reticle). If there is no eccentricity, the movement distance of the cross image is 0. The imaging lens group 13 can simultaneously image the reticle 12 and the cross image onto the charge-coupled device 14 (i.e., the objective lens) for further observation.
[0058] In this embodiment, the imaging lens group 13 includes a first biconvex lens 13-1, a biconcave lens 13-2, and a second biconvex lens 13-3 arranged sequentially along the optical axis. There is a certain distance between the first biconvex lens 13-1 and the biconcave lens 13-2, and a certain distance between the biconcave lens 13-2 and the second biconvex lens 13-3. This imaging lens group 13 structure can achieve a high-resolution, wide-field-of-view imaging effect.
Claims
1. A reflective large-aperture eccentric meter, characterized in that, It includes a light source (1), an illumination lens group (2), a cross reticle (3), a semi-reflective prism (4), a collimating lens group, a first spherical mirror (7), and a second spherical mirror (8) arranged sequentially along the optical axis. The concave surface of the first spherical mirror (7) faces the convex surface of the second spherical mirror (8), and the first spherical mirror (7) has a central through hole that allows the outgoing parallel light from the collimating lens group to pass through. The convex surface of the second spherical mirror (8) reflects the collimating lens group outgoing parallel light for the first time to obtain primary reflected light, and the concave surface of the first spherical mirror (7) reflects the primary reflected light for the second time to obtain secondary reflected light. The secondary reflected light can converge on the optical principal axis to obtain the light convergence point (S). When the lens under test (9) is positioned between the second spherical mirror (8) and the light convergence point (S), the center of the radius of curvature of the surface under test of the lens under test (9) coincides with the light convergence point (S), and at least part of the secondary reflected light can illuminate the surface under test of the lens under test (9).
2. The reflective large-aperture eccentric meter according to claim 1, characterized in that, The first spherical mirror (7) has a concave surface curvature radius of a*200mm and a concave surface aperture diameter of a*80mm. The second spherical mirror (8) has a convex surface curvature radius of a*30mm and a convex surface aperture diameter of a*30mm. The initial distance between the first spherical mirror (7) and the second spherical mirror (8) is a*100mm, where a is a multiple.
3. The reflective large-aperture eccentric meter according to claim 2, characterized in that, The first spherical mirror (7) has a concave surface curvature radius of 200 mm and a concave surface aperture diameter of 80 mm. The second spherical mirror (8) has a convex surface curvature radius of 30 mm and a convex surface aperture diameter of 30 mm. The initial distance between the first spherical mirror (7) and the second spherical mirror (8) is 100 mm.
4. The reflective large-aperture eccentric meter according to claim 3, characterized in that, The distance between the first spherical reflector (7) and the second spherical reflector (8) is adjustable, and the adjustable range of the distance is 85-105mm.
5. The reflective large-aperture eccentric meter according to claim 4, characterized in that, The second spherical reflector (8) is mounted on the sliding guide rail.
6. The reflective large-aperture eccentric meter according to claim 1, characterized in that, The illumination lens group (2) includes a plano-convex lens one (2-1), a plano-convex lens two (2-2), a plano-convex lens three (2-3), and a plano-convex lens four (2-4) arranged sequentially along the optical axis. The convex surface of the plano-convex lens one (2-1) faces and is closely attached to the convex surface of the plano-convex lens two (2-2), and the convex surface of the plano-convex lens three (2-3) faces and is closely attached to the convex surface of the plano-convex lens four (2-4).
7. The reflective large-aperture eccentric meter according to claim 1, characterized in that, The collimating lens group includes a first sub-lens group (5) and a second sub-lens group (6); the first sub-lens group (5) includes a meniscus lens (5-1) and a plano-concave lens (5-2) arranged sequentially along the optical axis; the second sub-lens group (6) includes a meniscus lens (6-1) and a biconvex lens (6-2) arranged sequentially along the optical axis.
8. The reflective large-aperture eccentric meter according to claim 1, characterized in that, The reflective large-aperture eccentric instrument also includes a beam splitter (10) configured in conjunction with the semi-reflective and semi-transparent prism (4), and a reticle (12), an imaging lens group (13), and a charge-coupled device (14) configured in conjunction with the beam splitter (10).
9. The reflective large-aperture eccentric meter according to claim 8, characterized in that, The imaging lens group (13) includes a first biconvex lens (13-1), a biconcave lens (13-2), and a second biconvex lens (13-3) arranged sequentially along the optical axis.
10. The large-aperture reflective eccentricity meter according to claim 8, characterized in that, The reflective large-aperture eccentric instrument also includes an eyepiece (11) that is configured in conjunction with the beam splitter (10).