A method for calibrating an optical imaging instrument with a glass linear scale

Abstract

The present invention relates to a method for calibrating an optical imaging instrument with a glass linear scale. The optical imaging instrument at least includes a display device and a workbench. A crosshair is provided on the display device, and this crosshair is defined as a calibration crosshair. The method comprises the following steps: setting at least one reference object on the workbench of a tool microscope, where the reference object at least includes 1 crosshair, and this crosshair is defined as a reference crosshair; placing the glass linear scale on the workbench and making the line pattern on the glass linear scale parallel to one line of the reference crosshair. Specifically, making the line pattern on the glass linear scale parallel to the line in the reference crosshair that is perpendicular to the longitudinal direction of the glass linear scale; adjusting the eyepiece of the tool microscope so that the reference crosshair and the calibration crosshair coincide. It can quickly position the glass linear scale and improve the calibration efficiency.

Description

Technical Field

[0001] The present invention relates to a method for calibrating an optical imaging instrument with a glass linear scale, and particularly to a rapid calibration method for calibrating an optical imaging instrument with a glass linear scale, belonging to the field of metrology. Background Art

[0002] In the verification and calibration work of optical instruments such as universal tool microscopes, projectors, large tool microscopes, measuring microscopes, and image measuring instruments, the main metrological standard device used is a second-class glass linear scale. In the actual verification and calibration process, the verification time is often too long due to the problem of aligning the glass linear scale. Especially for enterprises with a large number of universal tool microscopes, the verification efficiency is slow due to the positioning problem of the glass linear scale.

[0003] The glass linear scale is a standard device for verifying tool microscopes and is used to verify the indication error of the tool microscope. Taking the verification of a universal tool microscope as an example, in actual work, since the glass linear scale does not have a special clamping device, during the verification process, it is necessary to manually align the engraved lines in the glass ruler with the crosshairs in the display device of the optical imaging instrument. Taking the universal tool microscope as an example, the length of the glass linear scale is 200 mm, and only a part of the engraved lines of the glass ruler can be observed through the eyepiece of the universal tool microscope. Therefore, it is necessary to first align the front-end engraved lines with the crosshairs, then move the workbench of the universal tool microscope along the X-axis to the rear end of the linear scale, and then adjust the position of the glass ruler to align the rear-end engraved lines of the glass ruler with the crosshairs of the eyepiece.

[0004] Since the linear scale does not have a positioning device, during the second adjustment, that is, when adjusting the position of the glass linear scale to align the rear-end engraved lines of the glass linear scale with the crosshairs of the eyepiece, the already adjusted front end will change, and it is necessary to move the universal tool microscope back to the front-end position for adjustment again. Repeating such adjustments, according to actual operation experience, when performing parallel adjustment of the scale lines in one direction, it is necessary to adjust (3 - 5) times, which takes about (5 - 10) minutes to align the engraved lines of the glass linear scale with the crosshairs of the universal tool microscope, and the operation efficiency is low. At the same time, since the width of the engraved lines in the glass ruler is greater than the width of the crosshairs of the eyepiece, the actual alignment effect is also affected by the eyesight of the verification personnel. The allowable indication error of the tool microscope is ±(1 + L / 100) μm, where L is the length (mm) of the scale to be verified, and the allowable error of the second-class glass linear scale is ±0.5 μm. In such a high-precision verification process, it is extremely vulnerable to human factors, which may lead to the verification result not conforming to the actual situation.

[0005] The alignment degree between the crosshair and the glass linear scale directly affects the indication error of calibrating a universal tool microscope. Therefore, during the current calibration process, most calibrators use plasticine to stick the glass linear scale to the workbench of the tool microscope and adjust the glass linear scale by moving the plasticine. Limited by the fact that the universal tool microscope can only be calibrated on-site, during the actual use of the universal tool microscope, the method of directly aligning lines is not required or has a limited scope of application. Therefore, most user enterprises and calibration institutions do not have suitable plasticine, or the plasticine becomes ineffective after a long time, resulting in the difficulty of implementing this solution during the actual calibration process. Summary of the Invention

[0006] In view of the above deficiencies in the prior art, the invention provides a calibration method for calibrating an optical imaging instrument with a glass linear scale by rapid positioning.

[0007] The technical solution of the invention to solve the above technical problems is as follows: A method for calibrating a glass linear scale for an optical imaging instrument, the optical imaging instrument includes a display device and a workbench, and a crosshair is provided on the display device, which is defined as a calibration crosshair; characterized in that it includes the following steps:

[0008] At least one reference object is provided on the workbench, and the reference object includes at least 1 crosshair, which is defined as a reference crosshair;

[0009] Place the glass linear scale on the workbench and make the line pattern on the glass linear scale parallel to one line of the reference crosshair. Specifically, make the line pattern on the glass linear scale parallel to the line perpendicular to the length direction of the glass linear scale in the reference crosshair, that is, the line parallel to the Y axis;

[0010] Adjust the workbench to move along the X and / or Y axis so that the reference crosshair and the calibration crosshair coincide.

[0011] The beneficial effect that the above technical solution can achieve is: By providing at least 1 crosshair reference object on the workbench, only by aligning the calibration crosshair with the set reference crosshair can the purpose of making the crosshair on the display device parallel to the line pattern on the glass linear scale be achieved, which can quickly position the glass linear scale and improve the calibration efficiency.

[0012] In one embodiment, two or three reference crosshairs are set, the intersection of the two or three reference crosshairs is on the same straight line, and the two or three reference crosshairs are set along the length direction of the glass line scale. By setting two or three reference crosshairs, the calibration crosshairs of the image instrument to be inspected coincide with any two reference crosshairs respectively, and two points determine a straight line, which can ensure that the lines of the glass line scale (the scaled lines on the glass line scale) are completely vertical or horizontal with the image instrument to be inspected, and it is no longer necessary to readjust the scale lines of the glass line scale every time the calibration instrument is calibrated. This can greatly reduce the adjustment time before calibration and improve calibration efficiency on the one hand, and can also greatly improve the calibration quality on the other hand, and reduce the reading error caused by poor personal eyesight.

[0013] In one embodiment, the reference crosshairs are engraved on a glass sheet, and the reference crosshairs are engraved on the glass sheet using a photolithography machine. Since glass linear rulers are expensive and easily deformed, taking a universal tool microscope as an example, its minimum magnification is 4 times, usually 10 times, and this magnification means that the width of the line must be magnified 10 times, so the line width of the crosshairs in the alignment method is required not to exceed 0.01 mm. Based on this situation, it is difficult to engrave the reference crosshairs on a glass linear ruler. This problem can be solved by engraving the reference crosshairs on a glass sheet independent of the glass linear ruler.

[0014] In one embodiment, the glass sheet can rotate relative to the workbench. The glass sheet is easy to deform. Once deformed, the center line of the reference crosshairs on at least two glass sheets may not be parallel to the X-axis, and may even be a broken line. In this case, the glass sheet can be set to rotate relative to the workbench, so that the rotation angle of the reference crosshairs can be adjusted so that the center line of the reference crosshairs on at least two glass sheets is a straight line parallel to the X-axis.

[0015] In one embodiment, the reference crosshairs are engraved on the glass line ruler. This method does not require an additional carrier for the reference crosshairs, and although it is very convenient, it is not applicable to all image instruments to be inspected.

[0016] In one embodiment, the specific method of placing the glass wire ruler on the workbench and making the lines on the glass wire ruler parallel to a line of the reference cross line is:

[0017] 1) placing a glass line ruler positioning device on the workbench;

[0018] 2) placing the glass line ruler in the glass line ruler positioning device;

[0019] 3) Adjust the angle of the glass linear scale through the adjustment mechanism on the glass linear scale positioning device until the scale line on the glass linear scale is parallel to one of the lines of the reference crosshair.

[0020] In this embodiment, place the glass linear scale positioning device on the workbench. The glass linear scale is fixed inside the device. There is no need to use plasticine to fix the glass linear scale. The angle of the glass linear scale can also be adjusted through the adjustment mechanism so that the scale line (engraved line) on the glass linear scale is parallel to one of the lines of the reference crosshair, and the adjustment is relatively accurate.

[0021] In one embodiment, the specific method of placing the glass linear scale inside the glass linear scale positioning device:

[0022] Place the glass linear scale in the scale protection shell on the glass linear scale positioning device. The scale protection shell is provided with a cavity for accommodating the glass linear scale, and the glass linear scale is placed in the cavity.

[0023] In one embodiment, the specific method of placing the glass linear scale inside the glass linear scale positioning device:

[0024] It further includes that after placing the glass linear scale in the cavity, place a flexible material between the glass linear scale and the inner wall of the scale protection shell to fix the glass linear scale in the cavity. The flexible material can prevent the outer periphery of the glass linear scale from being knocked and damaged and avoid the friction between the glass linear scale and the scale protection shell.

[0025] The flexible material can be relatively soft materials such as paper, cotton, silk floss, rubber, etc.

[0026] In one embodiment, the specific method of adjusting the angle of the glass linear scale through the adjustment mechanism on the glass linear scale positioning device:

[0027] Rotate the scale protection shell on the plane parallel to the workbench through the adjustment mechanism until the scale line on the glass linear scale is parallel to one of the lines of the reference crosshair, and the adjustment mechanism does not contact the glass linear scale.

[0028] In this embodiment, the adjustment mechanism never contacts the glass linear scale. By adjusting the angle of the scale protection shell, the angle of the glass linear scale is adjusted, achieving the effect of not damaging the glass linear scale.

[0029] In one embodiment, the adjustment mechanism at least includes an adjustment knob provided on one side of the scale protection shell and a reset mechanism provided on the opposite side of the side where the adjustment knob is located; when adjusting the angle of the glass linear scale, only need to rotate the adjustment knob.

[0030] In this embodiment, a human operator can adjust the knob and the reset mechanism to achieve forward and reverse rotation of the glass linear scale, thereby achieving the purpose of angle adjustment. The structure is simple and the adjustment accuracy is relatively high.

[0031] In one embodiment, the glass linear scale positioning device further includes a base, and the glass sheet, the linear scale protection shell, and the adjustment mechanism are all arranged on the base.

[0032] In this embodiment, the base can be made of steel. The glass sheet, the linear scale protection shell, and the adjustment mechanism are all arranged on the base. The whole can be moved and placed, which is very convenient. Moreover, the base has a relatively large weight, and generally does not require an additional fixing mechanism when placed on a workbench, nor does it require putty for fixing. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] FIG. 1(a) shows the initial state when calibrating the crosshair and aligning it with the glass linear scale in the prior art;

[0034] FIG. 1(b) is a schematic diagram showing the state when the calibration crosshair and the glass linear scale are aligned in the prior art.

[0035] Figure 2 It is a diagram of the alignment method adopted by the present invention;

[0036] Figure 3 It is a flowchart of the steps of one embodiment of the present invention;

[0037] Figure 4 It is a three-dimensional structure diagram of a glass linear scale positioning device in the present invention;

[0038] Figure 5 It is a top view of a combination of a glass linear scale positioning device and a glass linear scale in the present invention;

[0039] Figure 6 A left view of a glass linear scale positioning device in the present invention

[0040] Figure 7 is Figure 6 a cross-sectional view taken along the B-B direction; DETAILED DESCRIPTION OF THE EMBODIMENTS

[0041] The principles and features of the present invention are described below with reference to the accompanying drawings. The examples given are only used to explain the present invention and are not intended to limit the scope of the present invention.

[0042] The structures, proportions, sizes, etc. shown in the drawings of this specification are only used to cooperate with the content disclosed in the specification for those skilled in this technology to understand and read, and are not used to limit the conditions under which the present invention can be implemented. Therefore, they do not have a substantial technical meaning. Any modification of the structure, change in the proportional relationship, or adjustment of the size, without affecting the effects that the present invention can produce and the purposes that can be achieved, should still fall within the scope covered by the technical content disclosed in the present invention. At the same time, the terms such as "upper", "lower", "left", "right", "middle", and "one" cited in this specification are only for the convenience of clear narration and are not used to limit the scope of implementation of the present invention.

[0043] In this application, the X-axis refers to the direction consistent with the length direction of the glass linear scale under the verification state, and the Y-axis refers to the direction perpendicular to the X-axis, which is the same as the X / Y-axis direction in the commonly used three-dimensional coordinate system.

[0044] In the verification and calibration work of optical imaging instruments such as universal tool microscopes, large tool microscopes, and measuring microscopes, the main metrological standard device used is the second-class glass linear scale. During the actual verification and calibration process, the verification time has been prolonged many times due to the problem of aligning the glass linear scale. Especially for enterprises with a large number of universal tool microscopes, the verification efficiency is slow due to the problem of positioning the glass linear scale.

[0045] In the prior art, the alignment of the glass linear scale and the eyepiece is shown in FIGS. 1(a) and 1(b). The initial state is shown in FIG. 1(a), and after the alignment is completed, it is shown in FIG. 1(b). Specifically, the crosshair on the eyepiece needs to be aligned with the scale lines of the glass linear scale. The specific method is as follows: Taking the verification universal tool microscope as an example, in actual work, during the verification process, it is necessary to manually align the scale lines in the glass scale with the crosshair (calibration crosshair 301) in the eyepiece of the universal tool microscope. The length of the glass linear scale is 200 mm, and the eyepiece of the universal tool microscope can only observe a part of the scale lines of the glass scale. Therefore, it is necessary to first align the front-end scale line with the calibration crosshair 301, then move the workbench of the universal tool microscope so that it moves along the X-axis to the rear end of the glass linear scale, and then align the rear-end scale line of the glass scale with the crosshair of the eyepiece by adjusting the position of the glass scale. Since the linear scale has no positioning device, when making the second adjustment, that is, when adjusting the position of the glass linear scale so that the rear-end scale line of the glass linear scale is aligned with the crosshair of the eyepiece, the already adjusted front end will change, and it is necessary to move the universal tool microscope to the front-end position again for adjustment. Repeating such adjustments, according to actual operation experience, when making parallel adjustments to the scale lines in one direction, it is necessary to adjust (3 - 5) times, which takes about (5 - 10) minutes to align the scale lines of the glass linear scale with the crosshair of the universal tool microscope, and the operation efficiency is low. At the same time, since the width of the scale lines in the glass scale is greater than the width of the crosshair of the eyepiece (calibration crosshair 301), the actual alignment effect is also affected by the eyesight of the verification personnel. The allowable error of the indication of the tool microscope is ±(1 + L / 100) μm, where L is the length (mm) of the scale to be verified, and the allowable error of the second-class glass linear scale is ±0.5 μm. In such a high-precision verification process, it is extremely vulnerable to human factors, which may lead to the verification result not conforming to the actual situation.

[0046] To solve the above problems, the present application proposes a new alignment method, as Figure 2 shown. On the linear scale or the workbench, at least two reference crosshairs 131 are arranged in parallel, and the two parallel reference crosshairs 131 are aligned with the scale lines 201 (the scale lines 201 can also be referred to as scale markings 201) on the glass linear scale. During verification, it is only necessary to align the calibration crosshair 301 on the eyepiece with the reference crosshairs 131 respectively, that is, the positioning of the glass linear scale is completed. The present application specifically discloses:

[0047] A method for calibrating an optical imaging instrument with a glass linear scale, as Figure 3 shown. The optical imaging instrument includes a display device and a workbench. A crosshair is provided on the display device. Taking the universal tool microscope as an example, its display device is an eyepiece, and a crosshair is provided on the eyepiece, and this crosshair is defined as the calibration crosshair 301. It is characterized in that it includes the following steps:

[0048] At least one reference object is arranged on a workbench (not shown in the figure), wherein the reference object comprises at least one cross line, and the cross line is defined as a reference cross line 131;

[0049] Place the glass line ruler 200 on the workbench, and make the lines 201 on the glass line ruler parallel to a line of the reference cross line 131, specifically, make the lines 201 on the glass line ruler 200 parallel to a line of the reference cross line 131 that is perpendicular to the longitudinal direction of the glass line ruler 200;

[0050] The workbench is adjusted to move along the X-axis and / or the Y-axis so that the reference crosshairs 131 and the calibration crosshairs 301 coincide with each other.

[0051] At least one crosshair reference is set on the workbench. It is only necessary to align the crosshairs (calibration crosshairs 301) on the display device with the set reference crosshairs 131 to achieve the purpose of making the crosshairs on the eyepiece (calibration crosshairs) parallel to the lines 201 on the glass line scale, which can quickly locate and improve the calibration efficiency.

[0052] In one embodiment, two or three reference cross lines 131 are set, the intersection of the two or three reference cross lines 131 is on the same straight line, and the two or three reference cross lines 131 are set along the length direction of the glass line scale 200. By setting two or three reference cross lines 131, the calibration cross lines 301 of the image instrument to be inspected coincide with any two reference cross lines 131 respectively, and two points determine a straight line, which can ensure that the lines 201 of the glass line scale (the scale lines on the glass line scale) are completely vertical or horizontal to the image instrument to be inspected, and it is no longer necessary to readjust the scale lines of the glass line scale every time the calibration instrument is calibrated. This can greatly reduce the adjustment time before calibration and improve calibration efficiency on the one hand, and can also greatly improve the calibration quality on the other hand, and reduce the reading error caused by poor personal eyesight.

[0053] In one embodiment, the reference crosshairs 131 are engraved on a carrier other than the glass linear scale, for example, the carrier may be a glass sheet 130, and the reference crosshairs 131 are engraved on the glass sheet 130 using a photolithography machine. Since the glass linear scale 200 is expensive and easily deformed, taking a universal tool microscope as an example, its minimum magnification is 4 times, usually 10 times, and this magnification means that the width of the line should be magnified 10 times, so the line width of the crosshairs in the alignment method is required not to exceed 0.01 mm. Based on this situation, it is difficult to engrave the reference crosshairs on the glass linear scale, and the problem can be solved by engraving the reference crosshairs on a glass sheet independent of the glass linear scale 200.

[0054] In one embodiment, the glass sheet 130 is rotatable relative to the workbench.

[0055] In one embodiment, the reference crosshairs 131 are engraved on the glass line ruler 200. This method does not require an additional carrier of the reference crosshairs 131, and although it is very convenient, it is not applicable to all image instruments to be inspected.

[0056] In one embodiment, the glass line ruler 200 is placed on the workbench, and the line 201 on the glass line ruler 200 is parallel to a line of the reference cross line 131.

[0057] 1) placing a glass line ruler positioning device 100 on the workbench;

[0058] 2) placing the glass line ruler 200 in the glass line ruler positioning device 100;

[0059] 3) The angle of the glass line ruler 200 is adjusted by the adjustment mechanism on the glass line ruler positioning device 100 until the lines 201 on the glass line ruler 200 are parallel to a line of the reference cross line 131 .

[0060] In this embodiment, the glass line ruler positioning device 100 is placed on a workbench, and the glass line ruler 200 is fixed in the device. There is no need to use plasticine to fix the glass line ruler 200. The angle of the glass line ruler can also be adjusted by an adjustment mechanism so that the lines (marked lines) on the glass line ruler are parallel to a line of the reference cross line, and the adjustment is also relatively precise.

[0061] The glass line ruler positioning device 100 used in one embodiment of the present application is as follows: Figures 4 - 7 As shown, including:

[0062] A base 120, wherein the base 120 is provided with a receiving cavity 121 for receiving at least the glass line ruler 200;

[0063] A linear ruler protection shell 110 is used to accommodate and protect the glass linear ruler 200, and the linear ruler protection shell 110 is disposed in the accommodating cavity 121;

[0064] An adjustment mechanism, the adjustment mechanism is used to adjust the rotation angle of the glass line ruler and fix the adjusted glass line ruler 200; and

[0065] At least one reference crosshair carrier assembly is sequentially arranged along the length direction of the glass line ruler 200, and the reference crosshair carrier assembly includes a glass sheet 130, and the reference crosshair 131 is engraved on the glass sheet 130.

[0066] In one embodiment, the adjusting mechanism is disposed on the base 120. The adjusting mechanism includes an adjusting knob 140 near one side in the length direction of the accommodating cavity 121 and a reset mechanism arranged on the opposite side of the adjusting knob 140. When adjusting the angle of the glass linear scale, it is only necessary to rotate the adjusting knob 140.

[0067] In a preferred embodiment, there are three reference crosshair carrier assemblies, and there are two adjusting knobs 140. The two adjusting knobs 140 are respectively arranged between two adjacent reference crosshair carrier assemblies. Preferably, the distances between the adjusting knob 140 and two adjacent reference crosshair carrier assemblies are the same.

[0068] In one embodiment, the adjusting knob 140 includes a screw 142 and a rotating head 141. The screw 142 is arranged perpendicular to the length direction of the accommodating cavity 121. One end of the screw 142 contacts the linear scale protection shell 110, and the other end is provided with the rotating head 141. The base 120 is provided with a first threaded hole adapted to the screw 142.

[0069] In a preferred embodiment, the rotating head 141 is fixedly connected to the screw 142.

[0070] In one embodiment, the reset mechanism includes a pressing plate 151, a reset spring 154, and a fixing block 152. The pressing plate 151 is disposed on the side opposite to the adjusting knob 140. The pressing plate 151 is horizontally rotatably connected to the base 120. The horizontal rotation means rotating parallel to the workbench surface. Specifically, the base 120 is provided with a rotating shaft 153, and one end of the pressing plate 151 is connected to the base 120 through the rotating shaft 153.

[0071] The fixing block 152 is fixedly connected to the base 120. Specifically, the fixing block is provided with a second threaded hole 1522. The fixing block 152 is fixedly connected to the base 120 through a second screw. The second screw (not shown in the figure) is adapted to the second threaded hole 1522.

[0072] A reset spring 154 is provided between the end of the pressing plate 151 away from the rotating shaft 153 and the fixing block 152;

[0073] The axial direction of the reset spring 154 is perpendicular to the length direction of the accommodating cavity 121. The reset spring 154 applies a force to the pressing plate 151 to make the pressing plate 151 approach the accommodating cavity 121.

[0074] In a preferred embodiment, the pressing plate 151 is Z-shaped. One end of the pressing plate connected to the rotating shaft 153 is called the rotating end 1512, and the end of the pressing plate away from the rotating end is called the reset end 1511. At least part of the space between the reset end 1511 and the fixed block 152 overlaps in a direction perpendicular to the length direction of the accommodating cavity 121, and the fixed block 152 is located outside the reset end 1511. The inner end of the reset spring 154 abuts against the outer side surface of the reset end 1511.

[0075] In a preferred embodiment, the reset spring 154 can be a spring screw.

[0076] In one embodiment, the specific method of placing the glass linear scale 200 in the glass linear scale positioning device 100:

[0077] Place the glass linear scale 200 in the scale protection shell 110 on the glass linear scale positioning device. The scale protection shell 110 is provided with a cavity 111 for accommodating the glass linear scale 200, and the glass linear scale 200 is placed in the cavity 111.

[0078] In one embodiment, the specific method of placing the glass linear scale 200 in the glass linear scale positioning device 100:

[0079] After placing the glass linear scale 200 in the cavity 111, a flexible material is placed between the glass linear scale 200 and the inner wall of the scale protection shell 110 to fix the glass linear scale in the cavity 111. The flexible material can prevent the outer periphery of the glass linear scale 200 from being damaged by bumps and avoid friction between the glass linear scale and the scale protection shell 110.

[0080] The flexible material can be relatively soft materials such as paper, cotton, silk floss, rubber, etc.

[0081] In one embodiment, the cavity 111 has a rectangular structure.

[0082] In a preferred embodiment, rounded corners are provided at the four corners of the cavity 111.

[0083] In one embodiment, the specific method of adjusting the angle of the glass linear scale through the adjusting mechanism on the glass linear scale positioning device 100:

[0084] Rotate the scale protection housing 110 on a plane parallel to the workbench through the adjustment knob 140 until the scale on the glass scale 200 is parallel to one of the lines of the reference crosshair 131, and the adjustment knob does not contact the glass scale. And the reset mechanism fixes the glass scale in the scale protection housing 110.

[0085] In this embodiment, the adjustment mechanism never contacts the glass scale 200. By adjusting the angle of the scale protection housing 110, the angle of the glass scale 200 is adjusted, achieving the effect of not damaging the glass scale 200.

[0086] In this embodiment, an operator can adjust the knob, and combined with the function of the reset mechanism, the forward and reverse rotation of the glass scale is realized to achieve the purpose of angle adjustment. The structure is simple and the adjustment accuracy is relatively high.

[0087] In one embodiment, the base 120 can be made of steel or aluminum.

[0088] In one embodiment, the reference crosshair carrier assembly further includes a glass sheet mounting seat 160 and a locking mechanism 172. The glass sheet mounting seat is rotatably connected to the base 120.

[0089] Specifically, the glass sheet mounting seat 160 includes a sleeve 161, and a connecting shaft 20 connected to the sleeve 161 is provided on the base 120.

[0090] In a preferred embodiment, a locking rod 173 extending outward from the base 120 is provided on the glass sheet mounting seat 160, and a locking mechanism for locking the locking rod 173 is provided on the outside of the base 120.

[0091] In a preferred embodiment, the locking rod 173 is connected to the sleeve 161.

[0092] In a preferred embodiment, the locking mechanism 172 includes an adjusting screw mechanism and a reset spring mechanism. The adjusting screw mechanism and the reset spring mechanism are respectively arranged on both sides of the locking rod. And the adjusting screw mechanism at least includes an adjusting screw and a nut adapted to the adjusting screw. The axial direction of the adjusting screw is parallel to the X axis; the reset spring mechanism can be a spring screw, and the central axis of the spring screw is on the same straight line as the central axis of the adjusting screw.

[0093] In a preferred embodiment, the glass piece mounting seat 160 further includes ear pieces 163 disposed on both sides of the upper end of the sleeve 161, the ear pieces 162 are provided with limiting holes 164, and the base 120 is provided with limiting rods 171 adapted to the limiting holes 164. The limiting holes 164 are arc-shaped long holes coaxial with the sleeve 161 to limit the maximum adjustment angle on the glass piece 130.

[0094] In another embodiment, if the glass sheet is deformed so that the center lines of the three reference cross lines 131 are not on the same straight line, the glass sheet mounting base 160 is rotated by adjusting the locking mechanism, and then the glass sheet 130 is rotated until the center lines of the three reference cross lines 131 are on the same straight line.

[0095] In one embodiment, the method further includes the step of fixing the glass line ruler positioning device on the workbench, and plasticine or other fixing devices may be used.

[0096] In one embodiment, the method further includes, after fixing the glass line scale positioning device 100, moving the workbench to align the objective lens of the tool microscope with the glass line scale 200, and if the field of view is not clear, fine-tuning the focus until the field of view is clear. Adjusting the adjustment knob 140 to align the engraved lines of the glass line scale 200 with the calibration crosshairs 301.

[0097] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, 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 method for calibrating an optical imaging instrument with a glass linear scale. The optical imaging instrument includes a display device and a workbench. A crosshair is provided on the display device, and this crosshair is defined as a calibration crosshair. Characterized in that, The method includes the following steps: Set at least one reference object on the workbench. The reference object includes at least two crosshairs, which are defined as reference crosshairs. The at least two reference crosshairs are arranged in parallel. Place the glass linear scale on the workbench and make the scale lines on the glass linear scale parallel to one of the lines of the reference crosshairs. Adjust the workbench to move along the X-axis and / or Y-axis so that the reference crosshairs coincide with the calibration crosshairs.

2. The method for calibrating an optical imaging instrument with a glass linear scale according to claim 1, Characterized in that, The set reference crosshairs are two or three. The intersection points of the two or three reference crosshairs are on the same straight line, and the two or three reference crosshairs are all arranged along the length direction of the glass linear scale.

3. The method for calibrating an optical imaging instrument with a glass linear scale according to claim 1, Characterized in that, The reference crosshairs are engraved on a glass sheet.

4. The method for calibrating an optical imaging instrument with a glass linear scale according to claim 1, Characterized in that, The glass sheet can rotate relative to the workbench.

5. The method for calibrating an optical imaging instrument with a glass linear scale according to claim 3, Characterized in that, The specific method of placing the glass linear scale on the workbench and making the scale lines on the glass linear scale parallel to one of the lines of the reference crosshairs: 1) Place a glass linear scale positioning device on the workbench; 2) Place the glass linear scale in the glass linear scale positioning device; 3) Through the adjustment mechanism on the glass linear scale positioning device, adjust the angle of the glass linear scale until the scale lines on the glass linear scale are parallel to one of the lines of the reference crosshairs.

6. The method for calibrating an optical imaging instrument with a glass linear scale according to claim 5, Characterized in that, The specific method of placing the glass linear scale in the glass linear scale positioning device: Place the glass linear scale in the scale protection shell on the glass linear scale positioning device. The protection shell is provided with a cavity for accommodating the glass linear scale, and the glass linear scale is placed in the cavity.

7. The method for calibrating an optical imaging instrument with a glass linear scale according to claim 6, Characterized in that, The specific method of placing the glass linear scale in the glass linear scale positioning device: further includes placing a flexible material between the glass linear scale and the inner wall of the scale protection shell after placing the glass linear scale in the cavity to fix the glass linear scale in the cavity.

8. The method for calibrating an optical imaging instrument with a glass linear scale according to claim 6, Characterized in that, The specific method of adjusting the angle of the glass linear scale through the adjustment mechanism on the glass linear scale positioning device: The adjustment mechanism is used to rotate the scale protection case on a plane parallel to the workbench until the scale on the glass scale is parallel to one of the lines of the reference crosshair, and the adjustment mechanism does not contact the glass scale.

9. The method for calibrating an optical imaging instrument with a glass scale according to claim 8, wherein, the adjustment mechanism at least includes an adjustment knob arranged on one side of the scale protection case and a reset mechanism arranged on the opposite side of the side where the adjustment knob is located; when adjusting the angle of the glass scale, only the adjustment knob needs to be rotated.

10. The method for calibrating an optical imaging instrument with a glass scale according to claim 9, wherein, the glass scale positioning device further includes a base, and the glass sheet, the scale protection case, and the adjustment mechanism are all arranged on the base.

Images