A tunable angle calibration method using cylindrical rod mirrors

Abstract

A method for calibrating the angle of a cylindrical rod mirror using adjustable angles involves fabricating an L-shaped guide rail to support the cylindrical rod mirror. First, a standard angle block is used to adjust the reference position of a contrast goniometer. Then, the L-shaped guide rail supporting the cylindrical rod mirror is placed on a worktable, and the cylindrical rod mirror is rotated. Using the contrast goniometer with its reference position, the angle of the cylindrical rod mirror is adjusted through its scale lines to obtain the required high-precision tuning angle θ. The adjusted cylindrical rod mirror is then fixed to obtain the L-shaped angle guide rail. A guide rail blank is then fixed using the fixed cylindrical rod mirror, and after applying a light adhesive, the blank is ground smooth to obtain a guide rail with the tuned angle θ. This invention utilizes a contrast goniometer as the angle adjustment device, achieving a tuning angle accuracy superior to traditional processing methods. The use of an adjustable movable fixture to obtain a high-precision guide rail results in shorter processing time, lower cost, and simple operation.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of optical cold processing, in particular to a tunable angle calibration method using a cylindrical rod mirror and a device thereof, which can be used to replace hand modification of a body to process an optical prism body with a specific angle. BACKGROUND

[0002] In various optical paths, the prism product with an angle is an essential element for optical path turning. Its purpose is that the incident light enters the prism from the incident surface, and the outgoing light turns the incident light by a certain angle. The processing and manufacturing precision of the prism directly affects its role in the optical system. The technical indicators affecting the prism in the optical system include: the first and second parallel differences (θI, θII), that is, when the light is vertically incident from the incident surface of the prism, the deviation of the light to the normal of the exit surface before exiting is the first parallel difference, and the component in the direction perpendicular to the incident optical axis section is the second parallel difference. Therefore, the processing and manufacturing precision of the prism directly affects its precision in the optical system, and the preparation of the prism mainly relies on the body. The angle precision of the body determines the angle precision of the prepared prism, so the preparation of the body with high precision is very important.

[0003] At present, the traditional body processing method is to first process a surface as a reference surface (A), then glue 90° body, process the C surface of the body, grind and polish, clean the lower disc, then control the angle between the single piece modification (B) surface and the reference surface (A), and then point glue, fine grinding and polishing, and then grind and polish the required angle.

[0004] However, this method has the following disadvantages: 1) the first and second parallel overruns caused by the un-tight attachment during processing; 2) the angle processing precision is affected by the movement of the glue points due to the lack of timely processing; 3) the single piece modification angle is time-consuming and low in work efficiency; 4) the polishing surface is easy to produce marks and other surface defects affecting the processing products.

[0005] Therefore, how to overcome the shortcomings of the prior art and obtain a tunable angle calibration method using a cylindrical rod mirror to prepare bodies and other types of angle devices has become a technical problem to be solved in the prior art. SUMMARY

[0006] The present application aims to provide a tunable angle calibration method using a cylindrical rod mirror, which can replace the hand modification of the body angle, has short processing time, low cost, low skill requirement for people, is simple and easy to operate, and has an order of magnitude higher precision than the prior art.

[0007] To achieve this purpose, the present application adopts the following technical solutions:

[0008] A tunable angle calibration method using a cylindrical rod lens, comprising the following steps:

[0009] Flat plate processing step S110:

[0010] The first parallel flat plate, the second parallel flat plate, the plane of the back body blank, and the plane and cylinder of the cylindrical rod lens are polished respectively to improve the parallelism between the parallel flat plates and the parallel planes of the cylindrical rod lens, the perpendicularity between adjacent planes, and the consistency of the size;

[0011] L-shaped backrest preparation step S120:

[0012] The first parallel flat plate and the second parallel flat plate are placed at a relative angle of 90 degrees, and an L-shaped backrest is formed by edge alignment and fixation, wherein the front surface G surface of the first parallel flat plate is used to place the cylindrical rod lens, and the front surface A surface of the second parallel flat plate is used as the support surface of the cylindrical rod lens for subsequent angle tuning;

[0013] Standard angle position fixing step S130:

[0014] In this step, the existing standard angle block is used, the standard angle block is placed on the workbench of the contrast angle gauge, the autocollimator of the contrast angle gauge is adjusted, the autocollimation image of the standard angle block is measured, the standard angle of the contrast angle gauge is obtained, and the autocollimator is fixed;

[0015] Specific angle adjustment step S140:

[0016] The L-shaped backrest is placed on the workbench of the contrast angle gauge, the cylindrical rod lens is placed and fixed on the front surface G surface of the first parallel flat plate and the front surface A surface of the second parallel flat plate of the L-shaped backrest, for example, at the center position, so that the front surface J surface of the cylindrical rod lens faces the autocollimator of the contrast angle gauge, the cylindrical rod lens can be rotated to change the angle of the front surface J surface facing the autocollimator, the cylindrical rod lens is rotated so that the scale line of the autocollimation image of the cylindrical rod lens reaches the specified scale, and the cylindrical rod lens is fixed so that the front surface J surface of the cylindrical rod lens can form a specific angle θ with the first parallel flat plate of the L-shaped backrest after rotation, and an L-shaped angle backrest is obtained;

[0017] Back body blank fixing step S150:

[0018] The back body blank is fixed on the front surface J surface of the cylindrical rod lens of the L-shaped angle backrest;

[0019] Angle backrest preparation step S160:

[0020] The first parallel plate bottom surface F of the L-shaped angle leaning grid is fixed on the optical cement plate by optical cement, then the whole plate is ground and polished, the parallelism and surface shape are controlled respectively, and the angle leaning body with a specific angle θ is obtained by copying.

[0021] Optionally, the method further comprises a step of calibrating the angle of the leaning body S170,

[0022] The prepared leaning body is taken out from the L-shaped angle leaning grid and placed on the workbench of the contrast angle measuring instrument, and the inclination angle of the leaning body is tested by the contrast angle measuring instrument to determine whether the prepared leaning body is qualified.

[0023] Optionally, in the plate processing step S110,

[0024] The first parallel plate has a front surface G and a bottom surface F which are parallel to each other, and after polishing, the surface shape of the front surface G and the bottom surface F is -0.4≤N≤0, wherein N represents the number of apertures, + and - represent aperture high and low respectively; the parallelism of the front surface G and the bottom surface F is ≤10″, and the size consistency of the front surface G and the bottom surface F is ≤0.002mm;

[0025] The second parallel plate has a front surface A and a back surface B which are parallel to each other, and a bottom surface C which is perpendicular to the front surface A and the back surface B, and after processing, the surface shape of the front surface A, the back surface B and the bottom surface C is -0.4≤N≤0; the parallelism of the front surface A and the back surface B is ≤10″, the perpendicularity of the bottom surface C to the front surface A and the back surface B is ≤20″, and the size consistency of the front surface A and the back surface B is ≤0.002mm;

[0026] The cylindrical rod mirror has a front surface J and a cylindrical surface M, wherein the cylindrical surface is the cross section of the cylindrical rod mirror, the front surface is the cut surface of the cylindrical rod mirror and is also the surface for reflection, the cylindrical rod mirror has a rotation axis, and when it rotates along the rotation axis, the angle of the front surface relative to the collimator tube can be changed; after processing, the surface shape of the front surface J and the cylindrical surface M is -0.4≤N≤0; and the size consistency of the front surface J to the cylindrical line of the cylindrical surface M is ≤0.002mm;

[0027] The leaning body blank has a front surface AA and a bottom surface AB which are parallel to each other, and a side surface AC and a side surface AD which are perpendicular to the front surface AA and the bottom surface AB, and after processing, the surface shape of the front surface AA, the bottom surface AB, the side surface AC and the side surface AD is -0.4≤N≤0; the parallelism of the front surface AA and the bottom surface AB is ≤10″, the perpendicularity of the side surface AC and the side surface AD to the front surface AA and the bottom surface AB is ≤20″, and the size consistency of the front surface AA and the bottom surface AB is ≤0.002mm.

[0028] Optionally, the L-shaped backstop preparation step S120:

[0029] The bottom surface C surface of the second parallel plate is fixed on the left side of the front surface G surface of the first parallel plate by using glue, and the edges are aligned. After the glue is cured, an L-shaped backstop is formed.

[0030] Optionally, in the standard angle position fixing step S130,

[0031] The contrast goniometer includes a workbench and a collimator. The bottom surface AF of the standard angle block is cleaned and tightly attached to the workbench, so that the collimator of the contrast goniometer is aligned with the inclined surface AE of the standard angle block. The collimator is adjusted so that the scale line of the collimated image reflected by the standard angle block coincides with the 0 scale in the contrast goniometer. When the scale line of the collimated image reflected by the standard angle block is aligned with the 0 scale in the contrast goniometer, the angle of the collimator of the contrast goniometer at this time is the standard angle α. The collimator of the contrast goniometer is fixed, thereby obtaining the standard angle position point.

[0032] Optionally, in the specific angle adjustment step S140,

[0033] The bottom surface F surface of the first parallel plate of the L-shaped backstop is cleaned and tightly attached to the workbench of the contrast goniometer. The collimator for testing the angle is in front of the L-shaped backstop, so that the front surface A surface of the second parallel plate of the L-shaped backstop faces the collimator. The cylindrical rod lens is placed on the front surface G surface of the first parallel plate of the L-shaped backstop. The cylindrical rod lens is rotated and lightly pressed against the L-shaped backstop, so that the cylindrical rod lens is in full contact with the workbench. The scale line of the collimated image reflected by the front surface J surface of the cylindrical rod lens is displayed in the window of the collimator. The cylindrical rod lens is further adjusted until the scale line of the collimated image reflected by the front surface J surface of the cylindrical rod lens is located at the specified scale. The specific angle θ of the required high-precision tuning is obtained. The cylindrical rod lens is fixed by using glue, thereby obtaining the L-shaped angle backstop.

[0034] Optionally, in the back body blank fixing step S150,

[0035] The front surface J surface of the cylindrical rod lens in the L-shaped angle backstop is cleaned, and the bottom surface AB surface of the back body blank is also cleaned. The bottom surface AB surface of the back body blank is fixed on the front surface J surface of the cylindrical rod lens by using upward ridge line positioning. At this time, the back body blank is located in the upper center of the cylindrical rod lens, thereby obtaining the L-shaped angle backstop as a whole.

[0036] Optionally, in the angle back body preparation step S160,

[0037] The first parallel plate bottom surface F of the L-shaped angle backrest is treated clean, symmetrically and uniformly placed by light cementing, fixed on a light cementing plate, and then the whole plate is sanded and polished to control the parallelism and surface shape respectively, after processing, the surface shape of the front surface AH is -0.4≤N≤0; the height dimension H of the light cementing plate and the front surface AH of the backrest is consistent to ≤0.002mm.

[0038] Optionally, in the calibration step S170 of the angle of the backrest,

[0039] The prepared backrest has a bottom surface AB, an inclined surface AH and a side surface AD, the bottom surface AB of the prepared backrest is treated clean and closely attached to the workbench of the contrast goniometer, the front of the bottom surface AB of the backrest has a autocollimator for testing the angle, so that the AH surface of the backrest faces the autocollimator, and the backrest is lightly pressed to make the backrest fully contact with the workbench, at this time, the scale line of the reflected image of the inclined surface AH of the backrest is displayed at the position of the scale line in the contrast goniometer, and the scale value is read out, so that the angle of the prepared backrest is calculated, and whether the prepared backrest is qualified is judged.

[0040] In summary, the present application has the following advantages:

[0041] 1. The present application uses the contrast goniometer as the angle debugging device, since the accuracy of the contrast goniometer can reach 5", the angle accuracy of the present application is 20", which is better than the 180" of the traditional processing method.

[0042] 2. The present application copies the high-precision angle of the L-shaped angle backrest, uses the parallel theorem, the angle relationship of the internal alternate angle, adopts the conventional light cementing method, uses the upward edge line positioning to ensure the second parallel difference; uses the contrast goniometer to detect the angle, adopts the light cementing on the plate, processes the plate, polishes to control the parallelism of the backrest and the light cementing plate, and ensures the angle accuracy and the first parallel difference.

[0043] 3. The present application uses the cylindrical rod mirror on the rotating L-shaped backrest to realize any angle θ, the processing time required is short, the cost is low, the operation is simple, the operation skill requirement of the worker is low; through the plate fine grinding and polishing to control the parallelism of the backrest on the plate, the problems of high backrest rework rate, low product yield and low angle accuracy are solved; at the same time, the adjustable clamp can be disassembled and reused, which saves time and cost. BRIEF DESCRIPTION OF DRAWINGS

[0044] Figure 1 is the side view and front view of the first parallel plate according to the embodiment of the present application;

[0045] Figure 2 is the side view and front view of the second parallel plate according to the embodiment of the present application;

[0046] Figure 3is a L-type backrest according to an embodiment of the present application after preparation;

[0047] Figure 4 is a side view of a cylindrical rod lens according to an embodiment of the present application;

[0048] Figure 5 is a side view of a backrest blank according to an embodiment of the present application;

[0049] Figure 6 is a side view of a standard backrest angle a according to an embodiment of the present application;

[0050] Figure 7 is a schematic diagram of a collimator principle used according to the present application;

[0051] Figure 8 is a schematic diagram of a standard backrest angle a adjustment according to an embodiment of the present application;

[0052] Figure 9 is a schematic diagram of an adjustment to a specific angle θ according to an embodiment of the present application;

[0053] Figure 10 is a schematic diagram of an L-type angle backrest after rotating a specific angle θ according to an embodiment of the present application;

[0054] Figure 11 is a schematic diagram of a backrest blank light bonding on an L-type angle backrest according to an embodiment of the present application;

[0055] Figure 12 is a schematic diagram of an L-type angle backrest light bonding on a light bonding plate, a backrest being processed in a disc according to an embodiment of the present application;

[0056] Figure 13 is a flow chart of an adjustable angle calibration method using a cylindrical rod lens according to an embodiment of the present application.

[0057] The technical features respectively referred by the reference numerals in the drawings are:

[0058] 1, first parallel flat plate; 2, second parallel flat plate; 3, cylindrical rod lens; 4, backrest blank; 5, collimator tube; 6, reticle; 7, eyepiece; 8, reticle adjusting screw; 9, pitch adjusting screw; 10, workbench. Embodiment

[0059] The present application will be further described below in conjunction with the drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the present application, but not to limit the present application. In addition, it should be noted that, for the convenience of description, only the parts related to the present application are shown in the drawings, but not all the structures.

[0060] The present application mainly lies in that the L-shaped backrest is prepared to bear the cylindrical rod lens, first, the reference position of the contrast angle measuring instrument is adjusted by using the standard angle block; then the L-shaped backrest bearing the cylindrical rod lens is placed on the workbench, the cylindrical rod lens is rotated, the contrast angle measuring instrument with the reference position is used to adjust the angle of the cylindrical rod lens through the scale line, the required high-precision tuning angle θ is obtained, the adjusted cylindrical rod lens is fixed, and the L-shaped angle backrest is obtained; the fixed cylindrical rod lens is used to fix the backrest blank, and the backrest blank is polished after photo bonding to obtain the backrest with the tuning angle θ.

[0061] Referring to Figures 1-13 , a flow of an adjustable angle calibration method according to the present application is shown, and the corresponding schematic diagram in the process is shown.

[0062] The flat plate processing step S110:

[0063] The planes of the first parallel flat plate 1, the second parallel flat plate 2 and the backrest blank 4, and the plane and the cylindrical surface of the cylindrical rod lens 3 are polished respectively, so as to improve the parallelism between the parallel planes of the parallel flat plate and the cylindrical rod lens, the perpendicularity between the adjacent planes and the consistency of the size.

[0064] Specifically, in this step, referring to Figure 1 , the first parallel flat plate 1 has a front face G face and a bottom face F face which are parallel to each other, after polishing, the face shape of the front face G face and the bottom face F face is -0.4≤N≤0, wherein N represents the number of apertures, + and - respectively represent aperture high and low; the parallelism of the front face G face and the bottom face F face is ≤10″, and the size consistency of the front face G face and the bottom face F face is ≤0.002mm.

[0065] Referring to Figure 2 , the second parallel flat plate 2 has a front face A face and a back face B face which are parallel to each other, and a bottom face C face which is perpendicular to the front face A face and the back face B face, after processing, the face shape of the front face A face and the back face B face, and the bottom face C face is -0.4≤N≤0; the parallelism of the front face A face and the back face B face is ≤10″, the perpendicularity of the bottom face C face to the front face A face and the back face B face is ≤20″, and the size consistency of the front face A face and the back face B face is ≤0.002mm.

[0066] Referring to Figure 4 , the cylindrical rod lens 3 has a front face J face and a cylindrical surface M face, wherein the cylindrical surface is the cross section of the cylindrical rod lens 3, and the front face is the cut surface of the cylindrical rod lens 3 which is also the reflecting surface, the cylindrical rod lens 3 has a rotation axis, when it rotates along the rotation axis, the angle of the front face relative to the autocollimator tube can be changed, after processing, the face shape of the front face J face and the cylindrical surface M face is -0.4≤N≤0; the size consistency of the front face J face to the cylindrical line of the cylindrical surface M face is ≤0.002mm.

[0067] Referring to Figure 5 , the back body blank 4 has mutually parallel front surface AA surface and bottom surface AB surface, side surface AC surface and side surface AD surface, wherein the side surface AC surface and the side surface AD surface are perpendicular to the front surface AA surface and the bottom surface AB surface, after processing, the surface shape of the front surface AA surface and the bottom surface AB surface, the side surface AC surface and the side surface AD surface is -0.4≤N≤0; the parallelism of the front surface AA surface and the bottom surface AB surface is ≤10″, the perpendicularity of the side surface AC surface and the side surface AD surface to the front surface AA surface and the bottom surface AB surface is ≤20″, the size consistency of the front surface AA surface and the bottom surface AB surface is ≤0.002mm.

[0068] In a specific embodiment, the size of the first parallel flat plate 1 is 50x40x10±0.1mm, the size of the second parallel flat plate 2 is 40x25x10±0.1mm, and the size of the cylindrical rod lens 3 is φ40x25x50±0.1mm. But this size is only an example, and the parallel flat plate and the cylindrical rod lens of other sizes can also be used as long as the first parallel flat plate 1 can be used to carry the cylindrical rod lens 3, the second parallel flat plate 2 can be used to support the cylindrical rod lens 3, and the cylindrical rod lens 3 can be used to adjust the angle with the autocollimator of the contrast angle measuring instrument.

[0069] Therefore, the first parallel flat plate 1 and the second parallel flat plate 2 prepared by this step will lay the foundation for the preparation of the subsequent L-shaped backrest.

[0070] L-shaped backrest preparation step S120:

[0071] Referring to Figure 3 , so that the first parallel flat plate 1 and the second parallel flat plate 2 are placed at a relative angle of 90 degrees, and an L-shaped backrest is formed by edge alignment and fixed, wherein the front surface G surface of the first parallel flat plate 1 is used to place the cylindrical rod lens 3, and the front surface A surface of the second parallel flat plate 2 is used as the supporting surface of the cylindrical rod lens 3 for subsequent angle tuning.

[0072] In a specific embodiment, the bottom surface C surface of the second parallel flat plate is fixed on the left side of the front surface G surface of the first parallel flat plate 1 with glue, the edges are aligned, and after the glue is cured, an L-shaped backrest is formed.

[0073] Therefore, the L-shaped backrest capable of carrying the cylindrical rod lens 3 is obtained through this step.

[0074] Standard angle position fixing step S130:

[0075] In this step, the existing standard angle block will be used, the standard angle block is set on the workbench 10 of the contrast angle measuring instrument, the autocollimator 5 of the contrast angle measuring instrument is adjusted, the autocollimation image of the standard angle block is measured, the standard angle of the contrast angle measuring instrument is obtained, and the autocollimator is fixed.

[0076] Referring to Figure 6 , the standard angle block has a bottom surface AF, an inclined surface AE, and a side surface AG between the bottom surface AF and the inclined surface AE, wherein an included angle between the bottom surface AF and the inclined surface AE is a standard angle a.

[0077] Referring to Figure 7 , a collimator principle diagram is shown.

[0078] Referring to Figure 8 , the contrast goniometer includes a workbench 10, a collimator 5, a scale plate 6, an eyepiece 7, a scale plate adjusting screw 8, and a pitch adjusting screw 9. The bottom surface AF of the standard angle block is cleaned and closely attached to the workbench 10, so that the collimator 5 of the contrast goniometer is aligned with the inclined surface AE of the standard angle block. The collimator 5 is adjusted so that the scale line of the collimated image reflected by the standard angle block coincides with the 0 scale in the contrast goniometer. When the scale line of the collimated image reflected by the standard angle block is aligned with the 0 scale in the contrast goniometer, the angle of the collimator 5 of the contrast goniometer is the standard angle a (the alignment accuracy is within ±5″), the collimator 5 of the contrast goniometer is fixed, and thus the standard angle position point is obtained.

[0079] Specifically, in this step, first, the small bulb power is turned on, the scale plate adjusting screw 8 is loosened, the scale plate 6 is adjusted so that the scale line is perpendicular to the horizontal plane, the scale plate adjusting screw 8 is locked, and the eyepiece 7 is rotated so that the bright and clear scale line appears in the field of view of the eyepiece. For the contrast goniometer with a CCD camera, first, the display power is turned on, then the CCD power is turned on (the steps are reversed when the power is turned off), the light and the responding knob are adjusted, and thus the image on the display screen is clearest. The AF surface of the standard angle block is cleaned and closely attached to the workbench 10 of the contrast goniometer, so that the collimator 5 of the contrast goniometer is aligned with the inclined surface AE of the standard angle block. The pitch adjusting screw 9 is loosened, the collimator 5 is rotated, and the standard angle block is lightly pressed so that the standard angle block is in full contact with the workbench 10 (when the aperture is generated), so that the scale line of the collimated image reflected by the standard angle block is displayed in the window of the collimator 5. Then, the scale line is finely adjusted until the scale line of the collimated image reflected by the standard angle block coincides with the 0 scale in the contrast goniometer. At this time, the angle of the collimator 5 of the contrast goniometer is the standard angle a. The pitch adjusting screw 9 is locked, the collimator 5 is fixed, then the standard angle block is removed from the workbench 10, and thus the angle adjustment reference is obtained.

[0080] Specific angle adjustment step S140:

[0081] The L-shaped angle set is placed on the worktable 10 of the contrast goniometer, and the cylindrical rod lens 3 is placed and fixed on the front face G face of the first parallel plate 1 and the front face A face of the second parallel plate 2 of the L-shaped angle set, for example, the center position, so that the front face J face of the cylindrical rod lens 3 faces the autocollimator tube 5 of the contrast goniometer, the cylindrical rod lens 3 can be rotated to change the angle of the front face J face facing the autocollimator tube 5, the cylindrical rod lens 3 is rotated so that the scale line of the autocollimation image of the cylindrical rod lens 3 reaches the specified scale, and the cylindrical rod lens 3 is fixed so that the front face J face of the cylindrical rod lens 3 can form a specific angle θ with the first parallel plate 1 of the L-shaped angle set after rotation.

[0082] The specified scale refers to that the scale line of the autocollimation image of the cylindrical rod lens coincides with the 0 scale in the contrast goniometer or differs by Δθ. In this step, since the autocollimator tube 5 of the contrast goniometer is at the standard angle position point, the scale line of the autocollimation image of the cylindrical rod lens 3 is at the 0 scale, and at this time, the angle formed by the front face J face of the cylindrical rod lens 3 and the first parallel plate 1 of the L-shaped angle set is the standard angle α; when the scale line of the autocollimation image of the cylindrical rod lens 3 is at the 0 scale and differs by Δθ, the specific angle formed by the front face J face of the cylindrical rod lens 3 and the first parallel plate 1 of the L-shaped angle set is θ = α ± Δθ, that is, the specific angle θ required by the present application is obtained by adjusting the difference Δθ, and the L-shaped angle set is obtained.

[0083] Therefore, in this step, the contrast goniometer and the L-shaped angle set with adjustable angle are used, the cylindrical rod lens is rotated, and the scale line of the autocollimation image is matched with the scale line of the contrast goniometer, so that the L-shaped angle set with the specific angle θ is obtained.

[0084] Specifically, in this step, the bottom face F face of the first parallel plate 1 of the L-shaped angle set is treated clean and tightly attached to the worktable 10 of the contrast goniometer, the autocollimator tube 5 for testing the angle is arranged in front of the L-shaped angle set, so that the front face A face of the second parallel plate 2 of the L-shaped angle set faces the autocollimator tube 5, the cylindrical rod lens 3 is placed on the front face G face of the first parallel plate 1 of the L-shaped angle set, the cylindrical rod lens 3 is rotated, and the L-shaped angle set is lightly pressed to make the L-shaped angle set fully contact with the worktable 10 (when the aperture is generated), so that the scale line of the autocollimation image reflected by the front face J face of the cylindrical rod lens 3 is displayed in the window of the autocollimator tube 5, and the cylindrical rod lens 3 is further adjusted until the scale line of the autocollimation image reflected by the front face J face of the cylindrical rod lens 3 is located at the specified scale, the specific angle θ required by the high-precision adjustment is obtained, the cylindrical rod lens 3 is fixed with glue, and the L-shaped angle set is obtained.

[0085] In actual production, the required specific angle θ is variable and usually deviates from the angle block α, for example: θ = α ± Δθ. Therefore, the specific angle θ required by this invention is obtained by adjusting the difference Δθ. Specifically: when Δθ is positive, adjust the corresponding number of divisions downward from the position of the collimated image; when Δθ is negative, adjust the corresponding number of divisions upward from the position of the collimated image. When 30' ≥ Δθ ≥ 10', a contrast goniometer with an accuracy of 1' needs to be selected, with an alignment accuracy within ±30"; when 10' > Δθ ≥ 5", a contrast goniometer with an accuracy of 15" needs to be selected, with an alignment accuracy within ±5".

[0086] That is, the alignment accuracy of the present invention will be determined by the comparative goniometer used, thereby improving the accuracy of the adjustable angle of the present invention.

[0087] In this system, one small division of a 1' contrast goniometer represents 1', and one small division of a 15" contrast goniometer represents 15". Positive values ​​are imaged at the bottom, and negative values ​​at the top. Since the contrast goniometer has high testing accuracy, reaching 5", the above steps are repeated in the same way to fix all cylindrical rod mirrors onto the L-shaped guide rails, thus producing multiple L-shaped angle guide rails. Angle θ is fully inspected on the contrast goniometer. Qualified L-shaped angle guide rails are moved down the line, while unqualified ones are disassembled and the above steps are repeated until qualified rails are obtained, resulting in a complete set of L-shaped angle guide rails.

[0088] As described above, this invention adjusts the angle near the angle of a standard angle block, and the adjustment range is limited by the testing range of the comparison goniometer. If higher angular accuracy is required, a 15" comparison goniometer is needed. However, the actual Δθ (Δθ = α ± θ) is greater than the testing range of the 15" comparison goniometer, in which case it is necessary to repeatedly adjust Δθ. n (△θ=α±θ) n That is, the angle is adjusted by superimposing △θ multiple times, where θ is the angle of adjustment. n-1 To obtain a standard angle, repeat steps S130 and S140 to obtain a specific angle θ that meets the required accuracy.

[0089] Those skilled in the art should know that, because the adhesive has a curing time when fixing the cylindrical surface of the cylindrical rod lens 3 to the front surface G and the front surface A of the first parallel plate 1 and the second parallel plate on the L-shaped guide rail with quick-drying adhesive, the cylindrical rod lens may shift relative to the second parallel plate 2 and the first parallel plate 1 during this process. Therefore, it is necessary to fully inspect the angle θ on a comparative goniometer. Qualified L-shaped angle guide rails are transferred downwards, while unqualified ones are disassembled and the above steps are repeated until qualified ones are obtained, thus obtaining a complete set of L-shaped angle guide rails.

[0090] The angle θ between the front J surface of the cylindrical rod lens and the bottom F surface of the first parallel flat 1 is obtained by this step, which is the required L-type angle leaning grid specific angle θ, and lays a foundation for the next step of making the leaning body angle.

[0091] The L-type angle leaning grid is removed, which is the tunable angle device of the present application, as shown in Figure 10 , comprising a first parallel flat 1, a second parallel flat 2, and a cylindrical rod lens 3.

[0092] In the preferred embodiment, the autocollimator 5 and the cylindrical rod lens 3 of the contrast angle measuring instrument are adjusted, and the above operation is repeated until the angle error is within the specified range. However, the present application is not limited thereto, and the digital contrast angle measuring instrument can also be adjusted repeatedly to obtain a specific angle θ that meets the accuracy.

[0093] Optionally, the first parallel flat 1, the second parallel flat 2, and the cylindrical rod lens 3 of the present application are made of glass.

[0094] Leaning body blank fixing step S150:

[0095] Referring to Figure 11 , the leaning body blank 4 is fixed on the front J surface of the cylindrical rod lens 3 of the L-type angle leaning grid.

[0096] Specifically, in this step, the front J surface of the cylindrical rod lens 3 in the L-type angle leaning grid is cleaned, and the bottom AB surface of the leaning body blank 4 is also cleaned. The bottom AB surface of the leaning body blank 4 is fixed on the front J surface of the cylindrical rod lens 3 by using the upward ridge line positioning method. At this time, the leaning body blank 4 is located in the upper center of the cylindrical rod lens 3, and the L-type angle leaning grid is obtained. This step S150 is repeated to fix all the leaning body blanks 4 on the front J surface of the cylindrical rod lens 3, and the whole L-type angle leaning grid is obtained.

[0097] Angle leaning body preparation step S160:

[0098] Referring to Figure 12 , the bottom F surface of the first parallel flat 1 of the L-type angle leaning grid is fixed on the optical cement plate by optical cement, and then the whole plate is ground and polished to control the parallelism and surface shape respectively. The angle leaning body with a specific angle θ is obtained by copying.

[0099] Specifically, in this step, the first parallel plate bottom surface F of the L-shaped angle leaning body is treated clean, symmetrically and uniformly placed by means of optical cement, fixed on the optical cement plate, then the whole plate is ground and polished, the parallelism and surface shape are controlled respectively, after processing, the surface shape of the front surface AH is -0.4≤N≤0; the height dimension H of the optical cement plate and the front surface AH of the leaning body is consistent to ≤0.002mm, since the L-shaped angle leaning body and the optical cement plate are fixed by means of optical cement, there is no any thickness gap in the middle, at this time, the first parallel plate bottom surface F of the L-shaped angle leaning body and the front surface AH of the leaning body are parallel to each other, according to the parallel theorem, the internal error angle is equal, the angle of the leaning body is the specific angle θ required.

[0100] The skilled person in the art should know that, in actual production, in order to further reduce the error of the angle of the leaning body and the angle of the L-shaped angle leaning body, the edges of the optical cement plate can also be symmetrically placed with 4 parallel plate pads by means of optical cement, the polishing personnel judge the parallelism between the processing surface of the parallel plate and the optical cement plate by means of the plane interferometer to achieve a higher precision angle, according to the parallel theorem, the angle of the leaning body is the angle θ required.

[0101] The application further comprises a leaning body angle calibration step S170 for calibrating and testing the angle of the prepared leaning body to determine whether the prepared leaning body is qualified, specifically:

[0102] The prepared leaning body is taken down from the L-shaped angle leaning body and placed on the workbench 10 of the contrast angle gauge, the inclination angle of the leaning body is tested by means of the contrast angle gauge, so as to determine whether the prepared leaning body is qualified.

[0103] Specifically, the prepared leaning body has a bottom surface AB, an inclined surface AH and a side surface AD, the bottom surface AB of the prepared leaning body is treated clean and tightly attached to the workbench 10 of the contrast angle gauge, the front of the bottom surface AB of the leaning body has a collimator 5 for testing the angle, so that the AH surface of the leaning body faces the collimator 5, and the leaning body is lightly pressed to make the leaning body completely contact with the workbench 10 (when the light circle is generated), at this time, the scale line of the reflected image of the inclined surface AH of the leaning body is displayed at the position of the internal scale line of the contrast angle gauge, the scale value is read out, so as to calculate the angle of the prepared leaning body, and determine whether the prepared leaning body is qualified.

[0104] In summary, the application has the following advantages:

[0105] 1. The application uses the contrast angle gauge as the angle debugging device, since the accuracy of the contrast angle gauge can reach 5'', therefore the angle accuracy of the application is 20'', which is better than 180'' of the traditional processing method.

[0106] 2. The present application uses the high-precision angle of the L-shaped angle depending on the grid, uses the parallel theorem, the angle relationship of the internal alternate angle, adopts the conventional optical cement method, uses the upward ridge line positioning to ensure the second parallel difference; uses the contrast angle detector to detect the angle, adopts the optical cement upper disc, disc processing, polishing control depending on the parallelism of the optical cement plate, ensures the angle precision and the first parallel difference.

[0107] 3. The present application is superior to the conventional processing depending on the process of single piece angle technology, adopts the rotating L-shaped depending on the grid to realize the arbitrary angle θ, the modulation processing time is short, the cost is low, the operation skill requirement to the person is low. Simple and easy to operate, through the disc fine grinding, polishing control disc depending on the parallelism, solves the depending on the high rework rate, low yield, low angle precision and other problems, at the same time, the adjustable clamp can be disassembled and reused, saves time and cost.

[0108] Specifically, the present application is simple to operate, the depending on the angle precision is 20", which is superior to the angle precision 180" of the conventional processing method, the depending on the yield is 100%, which is superior to the yield 50% of the conventional processing method, and can be reused, without independent processing.

[0109] The above is the further detailed description of the present application combined with the specific preferred embodiment, which cannot be regarded as the specific embodiment of the present application limited to this. For the ordinary skilled in the art to which the present application belongs, without departing from the concept of the present application, a number of simple deductions or substitutions can be made, which should be regarded as belonging to the present application determined by the submitted claims.

Claims

1. A tunable angular calibration method using a cylindrical rod lens, characterized by, The method comprises the following steps: The flat processing step S110: The first parallel flat, the second parallel flat, the flat surface of the backrest blank, and the flat surface and cylindrical surface of the cylindrical rod lens are polished respectively to improve the parallelism between the parallel flat and the parallel surface of the cylindrical rod lens, the perpendicularity between adjacent flat surfaces, and the consistency of the size; The L-shaped backrest preparation step S120: The first parallel flat and the second parallel flat are placed at a relative angle of 90 degrees, and an L-shaped backrest is formed by edge alignment and fixation, wherein the front surface G surface of the first parallel flat is used for placing the cylindrical rod lens, and the front surface A surface of the second parallel flat is used as the supporting surface of the cylindrical rod lens for subsequent angle tuning; The standard angle position fixing step S130: In this step, the existing standard angle block is used, the standard angle block is placed on the workbench of the contrast goniometer, the autocollimator of the contrast goniometer is adjusted, the autocollimation image of the standard angle block is measured, the standard angle of the contrast goniometer is obtained, and the autocollimator is fixed; The specific angle adjustment step S140: The L-shaped backrest is placed on the workbench of the contrast goniometer, the cylindrical rod lens is placed and fixed at the center position of the front surface G surface of the first parallel flat and the center position of the front surface A surface of the second parallel flat of the L-shaped backrest, the front surface J surface of the cylindrical rod lens faces the autocollimator of the contrast goniometer, the cylindrical rod lens can rotate to change the angle of the front surface J surface facing the autocollimator, the cylindrical rod lens is rotated so that the scale line of the autocollimation image of the cylindrical rod lens reaches a specified scale, and the cylindrical rod lens is fixed so that the front surface J surface of the cylindrical rod lens can form a specific angle θ with the first parallel flat of the L-shaped backrest after rotation, and an L-shaped angle backrest is obtained; The backrest blank fixing step S150: The backrest blank is fixed on the front surface J surface of the cylindrical rod lens of the L-shaped angle backrest; The angle backrest preparation step S160: The bottom surface F surface of the first parallel flat of the L-shaped angle backrest is fixed on the optical cement plate by optical cement, and then the whole plate is ground and polished to control the parallelism and surface shape respectively, and an angle backrest with a specific angle θ is obtained by copying.

2. The angle calibration method according to claim 1, further comprising a backrest angle calibration step S170, The prepared backrest is removed from the L-shaped angle backrest as a whole and placed on the workbench of the contrast goniometer, the inclination angle of the backrest is tested by the contrast goniometer, and it is judged whether the prepared backrest is qualified.

3. The angle calibration method according to claim 1, wherein in the flat processing step S110, The first parallel flat has a front surface G surface and a bottom surface F surface which are parallel to each other, and after polishing, the surface shape of the front surface G surface and the bottom surface F surface satisfies -0.4≤N≤0, wherein N represents the number of apertures, + and - represent high and low apertures respectively; the parallelism of the front surface G surface and the bottom surface F surface is ≤10″, and the size consistency of the front surface G surface and the bottom surface F surface is ≤0.002mm. ​ ​ The second parallel flat has mutually parallel front face A face and back face B face, bottom face C face, wherein the bottom face C face is perpendicular to the front face A face and the back face B face, after processing, the front face A face and the back face B face, the bottom face C face surface shape-0.4≤N≤0; the parallelism of the front face A face and the back face B face is ≤10", the perpendicularity of the bottom face C face to the front face A face and the back face B face is ≤20", the size consistency of the front face A face and the back face B face is ≤0.002mm. The cylindrical rod lens has front face J face and cylindrical M face, wherein the cylindrical surface is the cross section of the cylindrical rod lens, the front face is the cut surface of the cylindrical rod lens, which is also the surface for reflection, the cylindrical rod lens has a rotation axis, when it rotates along the rotation axis, it can move the angle of the front face relative to the collimator tube, after processing, the front face J face and the cylindrical M face surface shape-0.4≤N≤0; the size consistency of the front face J face to the cylindrical M face cylindrical line is ≤0.002mm. The back body blank has mutually parallel front face AA face and bottom face AB face, side face AC face and side face AD face, wherein the side face AC face and the side face AD face are perpendicular to the front face AA face and the bottom face AB face, after processing, the front face AA face and the bottom face AB face, the side face AC face and the side face AD face surface shape-0.4≤N≤0; the parallelism of the front face AA face and the bottom face AB face is ≤10", the perpendicularity of the side face AC face and the side face AD face to the front face AA face and the bottom face AB face is ≤20", the size consistency of the front face AA face and the bottom face AB face is ≤0.002mm.

4. The angle calibration method according to claim 3, wherein, The L-shaped back grid preparation step S120 is: The bottom face C face of the second parallel flat is fixed on the left side of the front face G face of the first parallel flat with glue, and the edges are aligned, and after the glue is cured, an L-shaped back grid is formed.

5. The angle calibration method according to claim 1, wherein, In the standard angle position fixing step S130, The contrast angle gauge includes a workbench and a collimator tube, the bottom face AF of the standard angle block is treated clean and closely attached to the workbench, so that the collimator tube of the contrast angle gauge is aligned with the inclined face AE of the standard angle block, the collimator tube is adjusted so that the scale line of the collimated image reflected by the standard angle block coincides with the 0 scale in the contrast angle gauge, when the scale line of the collimated image reflected by the standard angle block is aligned with the 0 scale in the contrast angle gauge, the angle of the collimator tube of the contrast angle gauge at this time is the standard angle α, and the collimator tube of the contrast angle gauge is fixed, thereby obtaining the standard angle position point.

6. The angle calibration method according to claim 1, wherein, In the specific angle adjustment step S140, The first parallel plate bottom surface F of the L-shaped angle gauge is cleaned and closely attached to the workbench of the contrast angle measuring instrument, and a collimator for testing angle is provided in front of the L-shaped angle gauge, so that the second parallel plate front surface A of the L-shaped angle gauge faces the collimator, the cylindrical rod lens is placed on the front surface G of the first parallel plate of the L-shaped angle gauge, the cylindrical rod lens is rotated and the L-shaped angle gauge is lightly pressed to make the L-shaped angle gauge fully contact with the workbench, so that the scale line of the collimated image reflected by the front surface J of the cylindrical rod lens is displayed in the window of the collimator, and the cylindrical rod lens is further adjusted until the scale line of the collimated image reflected by the front surface J of the cylindrical rod lens is located at the specified scale, thereby obtaining the specific angle θ required for high-precision tuning, and the cylindrical rod lens is fixed with glue to obtain the L-shaped angle gauge.

7. The angle calibration method according to claim 1, wherein, in the blank fixing step S150, the front surface J of the cylindrical rod lens in the L-shaped angle gauge is cleaned, and the bottom surface AB of the blank is also cleaned, and the bottom surface AB of the blank is fixed on the front surface J of the cylindrical rod lens by using the upward ridge line positioning method, at this time the blank is located in the upper center of the cylindrical rod lens, thereby obtaining the L-shaped angle gauge.

8. The angle calibration method according to claim 1, wherein, in the angle gauge preparation step S160, the first parallel plate bottom surface F of the L-shaped angle gauge is cleaned, and the L-shaped angle gauge is symmetrically and uniformly placed on the optical glue plate by optical glue, and then the entire optical glue plate is ground and polished, and the parallelism and surface shape are controlled respectively, after processing, the surface shape of the front surface AH is -0.4≤N≤0; the height consistency of the optical glue plate and the front surface AH of the blank is ≤0.002mm.

9. The angle calibration method according to claim 1, wherein, in the blank angle calibration step S170, the prepared blank has a bottom surface AB, an inclined surface AH and a side surface AD, the bottom surface AB of the prepared blank is cleaned and closely attached to the workbench of the contrast angle measuring instrument, and the front surface AB of the blank has a collimator for testing angle, so that the AH surface of the blank faces the collimator, and the blank is lightly pressed to make the blank fully contact with the workbench, at this time the scale line of the image reflected by the inclined surface AH of the blank is displayed at the position of the scale line in the contrast angle measuring instrument, and the scale value is read out, thereby calculating the angle of the prepared blank, and judging whether the prepared blank is qualified.

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