Dual-scale measuring device and measuring method for measuring the viewing angle of an optical element

Abstract

The present invention relates to a dual-scale measuring device and a measuring method for measuring the viewing angle of an optical element, including a support frame, a large scale, a small scale, a vernier disc, a vernier and a stage. The vernier is mounted on the vernier disc and abuts against the large scale, and the stage is located directly above the center of the vernier disc; the large scale and the vernier disc can rotate relative to each other, and a first locking device is provided between the small scale and the large scale or the vernier disc; when the first locking device is locked, rotating the small scale can drive the large scale or the vernier disc to rotate synchronously, and the rotation refers to a rotational movement centered on the axis of the large scale under the action of an external force. This application is mainly used to measure the exit angle of the exit light of an optical element when it is incident by a symmetric light source, and calculate the size of the viewing angle based on this; it can be used to measure the effective viewing angle of a single optical element or an optical element group, evaluate the optical element or system through this important parameter of the viewing angle, and provide guidance and reference for the application field of the optical element.

Description

Technical Field

[0001] The present invention relates to the technical field of optical element measurement, and particularly to a dual-scale measurement device and a measurement method for measuring the viewing angle of an optical element. Background Art

[0002] The viewing angle is an important parameter of an optical element, and it is of great significance to study and measure it. For example, what the human eye sees is a composite image, that is, a field of view of about 180 formed by splicing two images. The viewing angle of optical systems such as gems, single lenses, lens groups such as cameras, and space telescope systems also determines their application fields and values.

[0003] For the measurement of the viewing angle, there are existing methods such as the method of repetition measurement, the method of total combination angle measurement, and multi-view displacement measurement. These measurement methods have their own characteristics, but their deficiencies are also relatively obvious, such as low measurement accuracy or high equipment cost. These have all limited their application in actual viewing angle measurement to a certain extent. Summary of the Invention

[0004] When a beam of incident light irradiates an optical element, light will come out of the optical element. The present application provides a dual-scale measurement device for measuring the viewing angle of an optical element, which uses the dual-scale measurement method to measure the viewing angle. When a beam of parallel light is incident on an optical element and passes through the optical element, by measuring the exit angle of the outgoing light and the rotation angle of the small scale, and according to their geometric relationship, the viewing angle of the optical element can be calculated.

[0005] The present application is realized through the following technical solutions:

[0006] The dual-scale measurement device for measuring the viewing angle of an optical element provided by the present application includes:

[0007] A support frame;

[0008] A large scale, connected to the support frame;

[0009] A small scale, connected to the support frame and rotatable relative to the support frame. The small scale is eccentric to the large scale but has parallel axes;

[0010] A vernier disk, connected to the support frame and coaxial with the large scale;

[0011] A vernier, mounted on the vernier disk and fitting on the large scale;

[0012] A stage, connected to the support frame and located directly above the center of the vernier disk;

[0013] The large scale and the vernier disk are relatively rotatable;

[0014] A first locking device is provided between the small scale dial and the large scale dial or the vernier dial; when the first locking device is locked and the small scale dial is rotated, the large scale dial or the vernier dial can be driven to rotate synchronously.

[0015] The level of the stage can be adjusted or not, the height of the stage can be adjusted or not, the stage can be rotated relative to the support frame or not, and the height of the small scale dial can be adjusted or not.

[0016] The rotation refers to a rotational motion centered on the axis of the large scale dial under the action of an external force.

[0017] In particular, there are two verniers, and the two verniers are spaced 180° along the circumferential direction.

[0018] Optionally, a positioning straight rod is coaxially provided at the top of the small scale dial. The positioning straight rod is mainly used to measure the exit angle of the exit light of the optical element when incident by a symmetric light source. The change angle of the light direction can be easily measured by the projection of the light on the positioning straight rod.

[0019] Among them, there are the following three ways to realize the relative rotation of the large scale dial and the vernier dial:

[0020] Method 1: The large scale dial can rotate relative to the support frame, the vernier dial cannot rotate relative to the support frame, and there is a second locking device between the large scale dial and the support frame;

[0021] Method 2: The large scale dial can rotate relative to the support frame, the vernier dial can rotate relative to the support frame, there is a second locking device between the large scale dial and the support frame, and there is a third locking device between the vernier dial and the support frame;

[0022] Method 3: The large scale dial cannot rotate relative to the support frame, the vernier dial can rotate relative to the support frame, and there is a third locking device between the vernier dial and the support frame.

[0023] Optionally, the large scale dial is annular, the vernier dial is disc-shaped and located inside the large scale dial, and the vernier is fixedly installed on the edge of the vernier dial;

[0024] Or the vernier dial is annular, and the large scale dial is disc-shaped and located inside the vernier dial.

[0025] Optionally, the support frame includes a base and a shaft, and the large scale dial is coaxial with the shaft;

[0026] A first bushing is rotatably installed on the shaft, the large scale dial is fixedly connected to the first bushing, and a second locking device is provided between the first bushing and the shaft; a second bushing is rotatably installed on the first bushing, the small scale dial is fixedly connected to the second bushing through a connecting rod, and the first locking device is provided between the second bushing and the first bushing;

[0027] Alternatively, a first bushing is rotatably mounted on the shaft, the vernier scale disc is fixedly connected to the first bushing, and a third locking device is provided between the first bushing and the shaft; a second bushing is rotatably mounted on the first bushing, the small scale disc is fixedly connected to the second bushing through a connecting rod, and the first locking device is provided between the second bushing and the first bushing;

[0028] Alternatively, a first bushing and a third bushing are rotatably mounted on the shaft, the large scale disc is fixedly connected to the first bushing, and a second locking device is provided between the first bushing and the shaft; the vernier scale disc is fixedly connected to the third bushing, and a third locking device is provided between the third bushing and the shaft; a second bushing is rotatably mounted on the first bushing or the third bushing, the small scale disc is fixedly connected to the second bushing through a connecting rod, and the first locking device is provided between the second bushing and the first bushing or the third bushing;

[0029] Alternatively, a first bushing is rotatably mounted on the shaft, the large scale disc is fixedly connected to the first bushing, a slider is mounted on the large scale disc and can perform the rotation, the small scale disc is fixedly connected to the slider, and the first locking device is provided between the slider and the large scale disc;

[0030] Alternatively, a first bushing is rotatably mounted on the shaft, the vernier scale disc is fixedly connected to the first bushing, a slider is mounted on the vernier scale disc and can perform the rotation, the small scale disc is fixedly connected to the slider, and the first locking device is provided between the slider and the vernier scale disc.

[0031] Particularly, the stage is mounted on the top of the shaft.

[0032] Optionally, the stage includes an adjustable stage and a fixed stage, the fixed stage is fixedly connected to the support frame, the adjustable stage is placed on the fixed stage, and at least three vertical screws are installed at intervals along the circumferential direction on the fixed stage. By screwing the vertical screws, the vertical screws can support the adjustable stage from bottom to top.

[0033] Optionally, the double-scale disc measuring device for measuring the viewing angle of an optical element further includes a light source mounting component, the light source mounting component is fixedly connected or not fixedly connected to the support, the light source mounting component has a light source placement position, and the light source placement position is outside the large scale disc.

[0034] The optical element viewing angle measuring method provided by this application includes the following steps:

[0035] S1, place the light source outside the large scale disc, place the optical element to be measured directly above the large scale disc, and make the light source and the optical element to be measured on the same horizontal line L1;

[0036] S2, move the small scale disc along the circumferential direction with the axis of the large scale disc as the center, so that the vertical connection line L2 between the central axis of the small scale disc and the central axis of the large scale disc is perpendicular to the horizontal line L1;

[0037] Read the scale of the large dial at this time through the cursor, denoted as ; If there are two cursors, read the scales of the large dial at this time through the two cursors respectively, denoted as , ; At the same time, record the scale on the small dial 2 where the vertical connection line L2 is facing, denoted as ;

[0038] S3. Continue to move the small dial along the circumferential direction with the axis of the large dial as the center. At the same time, the large dial or the cursor disk moves synchronously with the small dial. When a clear light projection phenomenon appears on the small dial, continue to move the small dial until the light shadow passes through the center of the small dial, and then stop moving the small dial; If there is a positioning straight rod at the top of the small dial, when the projection of the positioning straight rod just appears on the small dial, stop moving the small dial;

[0039] Read the scale of the large dial 1 at this time through the cursor 4, denoted as ; If there are two cursors, read the scales of the large dial 1 at this time through the two cursors 4 respectively, denoted as , ; At the same time, record the scale on the small dial 2 where the light projection overlaps with the small dial 2, denoted as ;

[0040] Calculate the viewing angle of the optical element to be measured using the following formula;

[0041] ，

[0042] In the above formula, ; If there is only one cursor, then ; If there are two cursors, then .

[0043] Compared with the prior art, the present application has the following beneficial effects:

[0044] The present application reads the movement angle of the small dial in the circumferential direction through the scale of the cursor and the large dial; measures the change angle of the light direction through the change of the light on the small dial, and calculates the size of the viewing angle therefrom. Its structure is simple, can reduce costs, can be used to measure the viewing angle of a single optical element or an optical element group, and evaluate the optical element or system through this important parameter of the viewing angle, which can provide guidance and reference for the application field of the optical element. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] The drawings described herein are used to provide a further understanding of the embodiments of the present application, form a part of the present application, and do not constitute a limitation to the embodiments of the present invention.

[0046] Figure 1 It is a three-dimensional view of the large scale dial, small scale dial and vernier dial in the embodiment;

[0047] Figure 2 It is a schematic structural diagram of the double scale dial measuring device for measuring the viewing angle of an optical element in the first embodiment;

[0048] Figure 3 It is a schematic structural diagram of the horizontally adjustable stage in the embodiment;

[0049] Figure 4 It is a schematic diagram when the light source and the optical element are on the same horizontal line L1 and the vertical connection line L2 between the central axis of the small scale dial and the central axis of the large scale dial is perpendicular to the horizontal line L1 in the embodiment;

[0050] Figure 5 It is a schematic diagram when the small scale dial moves into place in the embodiment;

[0051] Figure 6 It is a schematic diagram of the optical path in the embodiment;

[0052] Figure 7 It is a geometric relationship diagram of the viewing angle and the optical path;

[0053] Figure 8 It is a schematic structural diagram of the double scale dial measuring device for measuring the viewing angle of an optical element in the second embodiment;

[0054] Figure 9 It is a schematic structural diagram of the double scale dial measuring device for measuring the viewing angle of an optical element in the third embodiment;

[0055] Figure 10 It is a schematic structural diagram of the double scale dial measuring device for measuring the viewing angle of an optical element in the fourth embodiment;

[0056] Figure 11 It is a schematic diagram of the large scale dial, ring and vernier in the fourth embodiment;

[0057] Figure 12 It is a schematic structural diagram of the double scale dial measuring device for measuring the viewing angle of an optical element in the fifth embodiment;

[0058] Figure 13 It is a schematic structural diagram of the double scale dial measuring device for measuring the viewing angle of an optical element in the sixth embodiment;

[0059] Figure 14 It is a schematic structural diagram of the height-adjustable stage in the seventh embodiment;

[0060] Figure 15 It is a schematic structural diagram of the double scale dial measuring device for measuring the viewing angle of an optical element in the eighth embodiment. Detailed implementation manners

[0061] To make the objectives, technical solutions, and advantages of this application clearer, the following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings in the embodiments. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. The components of the embodiments of the present invention usually described and illustrated in the accompanying drawings here can be arranged and designed in various different configurations.

[0062] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed present invention, but merely represents selected embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts fall within the scope of protection of the present invention.

[0063] It should be noted that, without conflict, the embodiments in the present invention and the features in the embodiments can be combined with each other. It should be noted that the various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. For the same or similar parts among the various embodiments, reference can be made to each other.

[0064] It should be noted that like reference numerals and letters denote similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0065] In the description of the present invention, it should be noted that the orientation or positional relationships indicated by the terms "upper", "lower", "inner", "outer", etc. are based on the orientation or positional relationships shown in the accompanying drawings, or the orientation or positional relationships when the product of this invention is normally placed, or the orientation or positional relationships commonly understood by those skilled in the art. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be construed as a limitation of the present invention. In addition, the terms "first", "second", etc. are only used for descriptive distinction and cannot be understood as indicating or implying relative importance.

[0066] In the description of the present invention, it should also be noted that unless otherwise clearly defined and limited, the terms "arranged", "installed", "connected", and "coupled" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0067] Embodiment 1

[0068] As Figure 1 shown, this embodiment provides a dual-scale measuring device for measuring the viewing angle of an optical element, including a large scale 1, a small scale 2, a vernier disk 3, a vernier 4, a stage 5 and a support frame 7.

[0069] The large scale 1 is connected to the support frame 7, the small scale 2 is connected to the support frame 7 and can rotate relative to the support frame 7. The small scale 2 is eccentric to the large scale 1 but has parallel axes.

[0070] The vernier disk 3 is connected to the support frame 7 and is coaxial with the large scale 1. The vernier 4 is mounted on the vernier disk 3 and fits on the large scale 1.

[0071] The stage 5 is connected to the support frame 7 and is located directly above the center of the vernier disk 3.

[0072] The large scale 1 and the vernier disk 3 can rotate relative to each other. In this embodiment, the large scale 1 can rotate relative to the support frame 7, and the vernier disk 3 cannot rotate relative to the support frame 7. There is a second locking device 72 between the large scale 1 and the support frame 7. Locking the second locking device 72 will prevent the large scale 1 from rotating.

[0073] There is a first locking device 71 between the small scale 2 and the large scale 1. Locking the first locking device 71, rotating the small scale 2 can drive the large scale 1 to rotate synchronously. Unlocking the first locking device 71, the small scale 2 can rotate independently.

[0074] The rotation herein refers to the rotational movement centered on the axis of the large scale 1 under the action of an external force.

[0075] In a possible design, as Figure 2 shown, the support frame 7 includes a base and a shaft 70. The large scale 1 is coaxial with the shaft 70. A first bushing 701 is rotatably mounted on the shaft 70. The large scale 1 is fixedly connected to the first bushing 701. There is a second locking device 72 between the first bushing 701 and the shaft 70. A second bushing 702 is rotatably mounted on the first bushing 701. The small scale 2 is fixedly connected to the second bushing 702 through a connecting rod 22. The first locking device 71 is provided between the second bushing 702 and the first bushing 701. The locking device can be a common locking structure such as a fastening knob or a clamping device.

[0076] In this embodiment, the large scale 1 is annular, the vernier disk 3 is disk-shaped, the vernier disk 3 is located inside the large scale 1, and the vernier 4 is fixedly mounted at the edge position of the vernier disk 3.

[0077] It should be noted that the top surfaces of the vernier disk 3 and the small scale 2 can be designed to be dark-colored to facilitate the observation of light more. The dark color can be black, dark brown, dark gray, etc.

[0078] In a possible design, a positioning straight rod 21 is coaxially provided at the top of the small scale 2.

[0079] In a possible design, to eliminate the eccentric error and improve the measurement accuracy, there are two verniers 4, and the two verniers 4 are preferably arranged at an interval of 180° in the circumferential direction. The two verniers respectively read data, find the differences respectively, and then sum and average to obtain the rotated angle, which can reduce the measurement error.

[0080] The graduation values of the large scale 1, the small scale 2 and the vernier 4 can be reasonably set according to needs. In a possible design, the minimum graduation value of the large scale 1 is 30 seconds, there are 30 grids on the vernier, and the minimum graduation value is 30 seconds / 30 = 1 second. The small scale 2 can be at an accuracy of 0.5 degrees or less according to the process and accuracy requirements, depending on how many stripes can be marked on the small scale 2.

[0081] In a possible design, the levelness of the stage 5 is adjustable, such as Figure 3 As shown, the stage 5 includes an adjustable stage 51 and a fixed stage 52. The fixed stage 52 is fixedly connected to the support frame 7. The adjustable stage 51 is placed on the fixed stage 52. At least three vertical screws 704 are installed at intervals in the circumferential direction on the fixed stage 52. By screwing the vertical screws 704, the vertical screws 704 can top against the adjustable stage 51 from bottom to top. Particularly, when the connection between the vertical screw 704 and the adjustable stage 51 is a contact connection, there are matching grooves at the corresponding positions on the bottom surface of the adjustable stage 51 to avoid slipping. By adjusting the extending length of the vertical screw 704, the levelness of the stage 5 is adjusted accordingly. In this embodiment, the stage 5 is installed on the top of the shaft 70 or the vernier disc 3.

[0082] Taking the measurement of the rainbow phenomenon as an example, this embodiment introduces the method for measuring the viewing angle of the optical element, which specifically includes the following steps:

[0083] S1, as Figure 4 As shown, place the light source 9 outside the large scale 1, and place the optical element 8 to be measured on the stage 5, so that the light source 9 and the optical element 8 to be measured are on the same horizontal line L1;

[0084] S2, loosen the first locking device 71, and move the small scale 2 along the circumferential direction with the axis of the large scale 1 as the center, so that the vertical connection line L2 between the central axis of the small scale 2 and the central axis of the large scale 1 is perpendicular to the horizontal line L1, as Figure 4 shown;

[0085] At this time, read the scale of the large scale 1 at this time through the vernier 4, and record it as ; if there are two verniers 4, read the scale of the large scale 1 at this time through the two verniers 4 respectively, and record them as , At the same time, record the scale on the small dial 2 that the vertical connecting line L2 is facing, which is recorded as .

[0086] S3, loosen the second locking device 72, tighten the first locking device 71, continue to move the small dial 2 in the circumferential direction with the axis of the large dial 1 as the center, drive the large dial 1 to move synchronously, and when a clear rainbow or neon phenomenon appears on the small dial 2, continue to move the small dial 2 so that the rainbow or neon phenomenon passes through the center of the small dial 2, and stop moving the small dial 2. If a positioning straight rod 21 is provided on the top of the small dial 2, stop moving the small dial 2 when the projection of the positioning straight rod 21 just appears on the small dial 2.

[0087] Use cursor 4 to read the scale of the large dial 1 at this time, and record it as ; If there are two cursors 4, read the scale of the large dial 1 at this time through the two cursors 4 respectively, and record it as , At the same time, record the scale on small dial 2 where the rainbow or neon phenomenon overlaps with small dial 2, and record it as ,like Figure 5 shown.

[0088] like Figure 6 , Figure 7 As shown, according to the geometric relationship, it can be deduced that the viewing angle 。

[0089] in, , if there is only one cursor 4, then ; If there are two cursors 4, then .

[0090] Optionally, in one possible operation, to facilitate later calculations, , , the 0° of small dial 2 is opposite to the .

[0091] Embodiment 2

[0092] like Figure 8 As shown, in this embodiment, the large dial 1 can rotate relative to the support frame 7, the cursor plate 3 can rotate relative to the support frame 7, a second locking device 72 is provided between the large dial 1 and the support frame 7, and a third locking device 73 is provided between the cursor plate 3 and the support frame 7. When the third locking device 73 is locked, the cursor plate 3 cannot rotate.

[0093] In a possible design, a first sleeve 701 and a third sleeve 703 are rotatably mounted on a shaft 70. The large scale dial 1 is fixedly connected to the first sleeve 701, and a second locking device 72 is provided between the first sleeve 701 and the shaft 70; the vernier dial 3 is fixedly connected to the third sleeve 703, and a third locking device 73 is provided between the third sleeve 703 and the shaft 70; a second sleeve 702 is rotatably mounted on the first sleeve 701 or the third sleeve 703, the small scale dial 2 is fixedly connected to the second sleeve 702 through a connecting rod 22, and a first locking device 71 is provided between the second sleeve 702 and the first sleeve 701 or the third sleeve 703.

[0094] In a possible design, the stage 5 is fixedly connected to the third sleeve 703, so that the stage 5 and the vernier dial 3 can rotate synchronously.

[0095] Embodiment III

[0096] As Figure 9 shown, in this embodiment, the large scale dial 1 cannot rotate relative to the support frame 7, the vernier dial 3 can rotate relative to the support frame 7, and a third locking device 73 is provided between the vernier dial 3 and the support frame 7.

[0097] In a possible design, a first sleeve 701 is rotatably mounted on a shaft 70. The vernier dial 3 is fixedly connected to the first sleeve 701, and a third locking device 73 is provided between the first sleeve 701 and the shaft 70; a second sleeve 702 is rotatably mounted on the first sleeve 701, the small scale dial 2 is fixedly connected to the second sleeve 702 through a connecting rod 22, and a first locking device 71 is provided between the second sleeve 702 and the first sleeve 701.

[0098] The optical element viewing angle measurement method disclosed in this embodiment specifically includes the following steps:

[0099] S1. Place the light source 9 outside the large scale dial 1, place the optical element 8 to be measured on the stage 5, and make the light source 9 and the optical element 8 to be measured on the same horizontal line L1;

[0100] S2. Loosen the first locking device 71, move the small scale dial 2 circumferentially around the axis of the large scale dial 1, so that the vertical connection line L2 between the central axes of the small scale dial 2 and the large scale dial 1 is perpendicular to the horizontal line L1, as Figure 4 shown;

[0101] At this time, read the scale of the large scale dial 1 through the vernier 4, and record the scale on the small scale dial 2 corresponding to the vertical connection line L2 at the same time.

[0102] S3, loosen the second locking device 72, tighten the first locking device 71, continue to move the small dial 2 along the circumferential direction with the axis of the large dial 1 as the center, drive the cursor 3 to move synchronously, and when a clear rainbow or neon phenomenon appears, continue to move the small dial 2 so that the rainbow or neon phenomenon passes through the center of the small dial 2, and stop moving the small dial 2. If a positioning straight rod 21 is provided on the top of the small dial 2, when the projection of the positioning straight rod 21 just appears on the small dial 2, stop moving the small dial 2.

[0103] Use cursor 4 to read the scale of large dial 1 at this time, and record the scale of small dial 2 where the rainbow or neon phenomenon overlaps with small dial 2, such as Figure 5 shown.

[0104] Embodiment 4

[0105] The difference between this embodiment and the previous three embodiments is that: Figure 10 , Figure 11 As shown, in this embodiment, the cursor plate 3 is annular, the large scale plate 1 is disc-shaped, and the large scale plate 1 is located inside the cursor plate 3.

[0106] In a possible design, the top surface of the large dial 1 is dark in color.

[0107] Embodiment 5

[0108] To facilitate the installation of light sources, Figure 12 As shown, the present embodiment is provided with a light source installation component 6 , which is fixedly connected to the support frame 7 or not fixedly connected to the support frame 7 , and the light source installation component 6 has a light source placement position, which is outside the large dial 1 .

[0109] In a possible design, when the large scale plate 1 is fixedly connected to the support frame 7, the light source installation component 6 can be directly fixedly connected to the large scale plate 1. When the cursor plate 3 is fixedly connected to the support frame 7, the light source installation component 6 can be directly fixedly connected to the cursor plate 3.

[0110] Embodiment 6

[0111] like Figure 13 As shown, in this embodiment, the loading platform 5 is connected to the support frame 7 via a side connecting piece.

[0112] Embodiment 7

[0113] During measurement, the top surface of the small dial 2 and the center of the optical element 8 to be measured are preferably on the same horizontal plane. Therefore, in order to accommodate optical elements 8 to be measured of different sizes, in this embodiment, the height of the small dial 2 is adjustable, or the height of the stage 5 is adjustable.

[0114] There are many ways to achieve height adjustment. For example, the stage 5 is installed on a telescopic adjusting rod; or the small dial 2 is installed on a telescopic adjusting rod, and the telescopic adjusting rod is then connected to other components.

[0115] In a possible design, as Figure 14 shown, the telescopic adjusting rod includes a first-stage rod 61, a second-stage cylinder 62 sleeved outside the first-stage rod 61, and a locking knob 63 for locking the second-stage cylinder 62 outside the first-stage rod 61.

[0116] When the stage 5 is installed on the telescopic adjusting rod, one of the first-stage rod 61 and the second-stage cylinder 62 is connected to the support frame 7, and the other is connected to the stage 5.

[0117] Similarly, when the small dial 2 is installed on the telescopic adjusting rod, one of the first-stage rod 61 and the second-stage cylinder 62 is connected to the support frame 7, and the other is connected to the small dial 2.

[0118] Embodiment VIII

[0119] As Figure 15 shown, in this embodiment, the large dial 1 can rotate relative to the support frame 7. A slider 704 is installed on the large dial 1. The slider 704 can rotate. The small dial 2 is fixedly connected to the slider 704. A first locking device 71 is provided between the slider 704 and the large dial 1. Locking the first locking device 71 can lock the slider 704 and the large dial 1; vice versa.

[0120] Similarly, in a possible design, the vernier scale 3 can rotate relative to the support frame 7, and the slider 704 is changed to be installed on the vernier scale 3.

[0121] This application is mainly used to measure the exit angle of the exit light of an optical element when it is incident by a symmetric light source, and then calculate the size of the viewing angle in sequence. This application can measure the viewing angle of a single optical element, such as a convex lens, a sphere, etc.; it can also be used to measure the viewing angle of an optical combination, such as an optical system like a telescope.

[0122] The above specific embodiments further elaborate on the purpose, technical solution, and beneficial effects of this application. It should be understood that the above is only the specific embodiments of the present invention and is not used to limit the protection scope of the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A double-scale measuring device for measuring the viewing angle of an optical element, characterized in that: Comprising: A support frame (7); a large dial (1), connected to the support frame (7); a small dial (2), connected to the support frame (7) and rotatable relative to the support frame (7), the small dial (2) being eccentric to the large dial (1) but having parallel axes; a vernier disk (3), connected to the support frame (7) and coaxial with the large dial (1); a vernier (4), mounted on the vernier disk (3) and in contact with the large dial (1); a stage (5), connected to the support frame (7) and located directly above the center of the vernier disk (3); the large dial (1) and the vernier disk (3) being relatively rotatable; a first locking device (71) being provided between the small dial (2) and the large dial (1) or the vernier disk (3); locking the first locking device (71), rotating the small dial (2) can drive the large dial (1) or the vernier disk (3) to rotate synchronously; the height of the small dial (2) is adjustable, the height of the stage (5) is adjustable or non-adjustable, the levelness of the stage (5) is adjustable or non-adjustable, the stage (5) is rotatable or non-rotatable relative to the support frame (7); the rotation refers to a rotational movement centered on the axis of the large dial (1) under the action of an external force.

2. The double dial measuring device for measuring the viewing angle of an optical element according to claim 1, characterized in that: There are two verniers (4), and the two verniers (4) are spaced 180° apart in the circumferential direction.

3. The double-dial measuring device for measuring the viewing angle of an optical element according to claim 1, wherein: A positioning straight rod (21) is coaxially provided at the top of the small dial (2).

4. The double-dial measuring device for measuring the viewing angle of an optical element according to claim 1, characterized in that: There are the following three ways to achieve the relative rotation of the large dial (1) and the vernier disk (3): Way 1: The large dial (1) is rotatable relative to the support frame (7), the vernier disk (3) is non-rotatable relative to the support frame (7), and there is a second locking device (72) between the large dial (1) and the support frame (7); Way 2: The large dial (1) is rotatable relative to the support frame (7), the vernier disk (3) is rotatable relative to the support frame (7), there is a second locking device (72) between the large dial (1) and the support frame (7), and there is a third locking device (73) between the vernier disk (3) and the support frame (7); Way 3: The large dial (1) is non-rotatable relative to the support frame (7), the vernier disk (3) is rotatable relative to the support frame (7), and there is a third locking device (73) between the vernier disk (3) and the support frame (7).

5. The double-dial measuring device for measuring the viewing angle of an optical element according to any one of claims 1-4, characterized in that: The large dial (1) is annular, the vernier disk (3) is disk-shaped, the vernier disk (3) is located inside the large dial (1), and the vernier (4) is fixedly mounted on the edge of the vernier disk (3); Or the vernier disk (3) is annular, and the large dial (1) is disk-shaped and located inside the vernier disk (3).

6. The dual-dial measuring device for measuring the viewing angle of an optical element according to claim 5, characterized in that: The support frame (7) includes a base and a shaft (70), and the large dial (1) is coaxial with the shaft (70); A first bushing (701) is rotatably mounted on the shaft (70). The large dial (1) is fixedly connected to the first bushing (701). A second locking device (72) is provided between the first bushing (701) and the shaft (70). A second bushing (702) is rotatably mounted on the first bushing (701). The small dial (2) is fixedly connected to the second bushing (702) through a connecting rod (22). The first locking device (71) is provided between the second bushing (702) and the first bushing (701). Alternatively, a first bushing (701) is rotatably mounted on the shaft (70). The vernier scale disc (3) is fixedly connected to the first bushing (701). A third locking device (73) is provided between the first bushing (701) and the shaft (70). A second bushing (702) is rotatably mounted on the first bushing (701). The small dial (2) is fixedly connected to the second bushing (702) through a connecting rod (22). The first locking device (71) is provided between the second bushing (702) and the first bushing (701). Alternatively, a first bushing (701) and a third bushing (703) are rotatably mounted on the shaft (70). The large dial (1) is fixedly connected to the first bushing (701). A second locking device (72) is provided between the first bushing (701) and the shaft (70). The vernier scale disc (3) is fixedly connected to the third bushing (703). A third locking device (73) is provided between the third bushing (703) and the shaft (70). A second bushing (702) is rotatably mounted on the first bushing (701) or the third bushing (703). The small dial (2) is fixedly connected to the second bushing (702) through a connecting rod (22). The first locking device (71) is provided between the second bushing (702) and the first bushing (701) or the third bushing (703).

7. The double-scale measuring device for measuring the viewing angle of an optical element according to claim 6, characterized in that: The stage (5) is mounted on the top of the shaft (70).

8. The double-dial measuring device for measuring the viewing angle of an optical element according to claim 1 or 7, characterized in that: The stage (5) includes an adjustable stage (51) and a fixed stage (52). The fixed stage (52) is fixedly connected to the support frame (7). The adjustable stage (51) is placed on the fixed stage (52). At least three vertical screws (704) are installed at intervals along the circumferential direction on the fixed stage (52). By screwing the vertical screws (704), the vertical screws (704) can support the adjustable stage (51) from bottom to top.

9. The dual-scale measuring device for measuring the viewing angle of an optical element according to any one of claims 1-4, 6-8, characterized in that: It further includes a light source mounting component (6). The light source mounting component (6) is fixedly connected to the support frame (7) or not fixedly connected to the support frame (7). The light source mounting component (6) has a light source placement position. The light source placement position is outside the large dial (1).

10. Method for measuring the viewing angle of an optical element, characterized in that: Using the dual-dial measuring device for measuring the viewing angle of an optical element as described in any one of claims 1-9, the method for measuring the viewing angle of an optical element includes the following steps: S1, Place the light source (9) outside the large dial (1), place the optical element to be measured (8) directly above the large dial (1), and make the light source (9) and the optical element to be measured (8) on the same horizontal line L1. S2. Move the small dial (2) circumferentially around the axis of the large dial (1) so that the perpendicular connecting line L2 between the central axis of the small dial (2) and the central axis of the large dial (1) is perpendicular to the horizontal line L1; Read the scale of the large dial (1) at this time through the cursor (4), denoted as ; If there are two cursors (4), read the scales of the large dial (1) at this time through the two cursors (4) respectively, denoted as , ; At the same time, record the scale on the small dial 2 directly opposite to the vertical connection line L2, denoted as ; S3. Continue to move the small dial (2) circumferentially around the axis of the large dial (1). At the same time, the large dial (1) or the vernier dial (3) moves synchronously with the small dial (2). When a clear light projection phenomenon appears on the small dial (2), continue to move the small dial (2) until the light shadow passes through the center of the small dial (2), and then stop moving the small dial (2); If a positioning straight rod (21) is provided at the center of the top of the small dial (2), then when the projection of the positioning straight rod (21) just appears on the small dial (2), stop moving the small dial (2); Read the scale of the large dial 1 at this time through the cursor 4, denoted as ; If there are two cursors (4), read the scale of the large dial 1 at this time through the two cursors 4 respectively, denoted as , ; At the same time, record the scale on the small dial 2 where the light projection overlaps with the small dial 2, denoted as ; Use the following formula to calculate the viewing angle of the optical element to be measured (8); ， In the above formula, ; if there is only one cursor (4), then ; if there are two cursors (4), then .

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