Adjusting mechanism

Abstract

An adjusting mechanism comprises at least one adjusting jackscrew and further comprises a flexible reed corresponding to the adjusting jackscrew, the adjusting jackscrew abuts against the flexible reed, and the shape of the flexible reed is changed by adjusting the adjusting jackscrew. The adjusting jackscrew acts on the flexible reed, and the adjusting precision is higher through deformation adjustment of the flexible reed.

Description

TECHNICAL FIELD

[0001] The present application relates to a kind of adjusting mechanism, especially a kind of adjusting mechanism applied to device fine adjustment. BACKGROUND

[0002] In the prior art, when adjusting the position of a component, an adjusting screw is usually used to directly act on the component, and the adjusting precision of the adjusting screw is the adjusting precision of the component, which is relatively low.For example, in a focusing device, a prism is mounted on a support seat, the support seat includes a bracket, a fixing member connected to the bracket, and a prism mounting member connected to the fixing member, the fixing member is provided with an adjusting screw, the adjusting screw abuts against the prism mounting member, and the height of the adjusting screw is adjusted to adjust the position and / or angle of the prism mounting member.This method can only rely on the precision of the adjusting screw, and although the precision can be ensured at the beginning of installation, it is prone to looseness during the height movement of the focusing device, and the installation precision cannot be ensured for a long time. SUMMARY

[0003] The present application aims to provide an adjusting mechanism with high adjusting precision.

[0004] To solve the above problems, the present application provides an adjusting mechanism, which includes at least one adjusting stud, and further includes a flexible spring sheet corresponding to the adjusting stud, the adjusting stud abuts against the flexible spring sheet, and the shape of the flexible spring sheet is changed by adjusting the adjusting stud.

[0005] Optionally, the flexible spring sheet is fixed between the mounting groove and the mounting member, the flexible spring sheet and the mounting member are located in the mounting groove, the mounting member is used to mount the component to be adjusted, and the flexible spring sheet rigidly supports the mounting member and the mounting groove and flexibly adjusts the mounting member.

[0006] Optionally, the adjusting mechanism includes four groups of flexible spring sheets and adjusting studs, which are divided into two groups located on opposite sides of the mounting member.

[0007] Optionally, the two groups of flexible spring sheets and adjusting studs located on the same side are arranged at intervals.

[0008] Optionally, the flexible spring sheet is fixed to the mounting member by a fixing nut, and the mounting member has a notch for accommodating the fixing nut.

[0009] Optionally, the flexible spring sheet includes a flexible portion and a fastening portion located at both ends of the flexible portion, the flexible portion is recessed from both side fixed end portions to the middle, the thickness of both ends of the flexible portion is the largest, and the thickness at the middle position is the smallest.

[0010] Optionally, the fastening portion includes a fixed end portion connected to the flexible portion and a reinforcing portion protruding inward from both sides of the fixed end portion.

[0011] Optionally, the end width of the flexible part is b, the thickness is a, the minimum thickness at the middle position is t, the middle recess of the flexible part is a circular arc, the cutting radius is R, the vertical stiffness of the flexible reed is the ratio of the moment M t of the microelement around the force in the Rx direction to the deformation angle a t of the flexible reed in the Rx direction, and the vertical stiffness of the flexible reed is obtained based on the following formula:

[0012]

[0013] wherein a t is the deformation angle of the flexible reed in the Rx direction, Mt is the moment of the microelement around the force in the Rx direction, E is the elastic modulus of the material; t is the minimum thickness of the flexible reed, R is the cutting radius of the flexible reed, θ1 is the central angle of the circular arc at the microelement slice, and θ2 is the central angle of the end point of the flexible part of the flexible reed.

[0014] Optionally, the length L of the flexible part of the flexible reed is determined according to the cross-sectional area of the lowest part of the vertical stiffness of the flexible reed, and the calculation method is L = AE / K2,

[0015] wherein A = t x b is the cross-sectional area of the flexible part, E is the product of the material density and the corresponding empirical coefficient, and K2 is the required horizontal stiffness requirement.

[0016] Horizontal stiffness wherein M2 is the overall mass of the mounting seat 200 of the first moving part and the first prism, a is the maximum acceleration of the first moving part, and S is the variable gap of the prism.

[0017] Compared with the prior art, the technical scheme of the present application adjusts the action of the top wire on the flexible reed, and adjusts the deformation of the flexible reed to achieve higher adjustment accuracy. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 is a schematic diagram of the focusing device.

[0019] Figure 2 is a schematic diagram of the focusing device.

[0020] Figure 3 is a schematic diagram of the motion device of the focusing device.

[0021] Figure 4 is a schematic diagram of the motion device of the focusing device.

[0022] Figure 5 is a schematic diagram of the first prism and the first magnetic part.

[0023] Figure 6 This is a schematic diagram of the first moving part.

[0024] Figure 7 yes Figure 3 Schematic diagram of the AA section.

[0025] Figure 8 This is a three-dimensional schematic diagram of the second moving part.

[0026] Figure 9 This is a three-dimensional schematic diagram of the back of the second moving part.

[0027] Figure 10 This is a schematic diagram of a flexible spring.

[0028] Figure 11 This is a schematic diagram of a micro-element.

[0029] Figure 12 This is a side view of a flexible spring. Detailed Implementation

[0030] To make the objectives, technical solutions, and advantages of the present invention clearer, the present invention will be described below with reference to specific embodiments shown in the accompanying drawings.

[0031] like Figures 1-12 As shown, the focusing device includes a housing 1 and a motion device 2. The motion device 2 is installed inside the housing 1. The housing 1 is provided with a light-transmitting hole 10 corresponding to the lens. A flexible limiting mechanism 11 is provided inside the housing 1 corresponding to the motion device 2 to avoid hard collision between the motion device 2 and the housing 1 during movement.

[0032] The motion device 2 includes a first motion component 20 and a second motion component 21. The second motion component 21 and the first motion component 20 are connected by a guide rail 22. Preferably, the guide rail 22 is a cross roller guide rail.

[0033] The first moving part 20 comprises a mounting seat 200, a first prism 201, a moving driving mechanism 202 and a fixing mechanism. The moving driving mechanism is connected to the mounting seat 200 and drives the mounting seat 200 to drive the first prism 201 to move relative to the second moving part 21. The mounting seat 200 comprises a bearing seat 2000 and a T-shaped slot. The bearing seat 2000 comprises a protruding part 2001 corresponding to the T-shaped slot. The protruding part 2001 is provided with a mounting hole 2002. The first prism 201 comprises a wedge-shaped main body 2010 and ear parts 2011 at both ends of the wedge-shaped main body 2010. The ear parts 2011 are provided with accommodating openings 2012 on the side facing the protruding part 2001. The fixing mechanism comprises two first magnetic parts 2030 and second magnetic parts 2040 which are mutually adsorbed. The first magnetic part 2030 comprises a cap part 2031 and an elongated part 2032 connected to the cap part. The cap part 2031 of the first magnetic part 2030 is mounted in the accommodating opening 2012 and connected to the first prism 201. The elongated part 2032 of the first magnetic part 2030 extends into the mounting hole 2002. The size of the first magnetic part is not greater than the size of the accommodating opening. The plane of the cap part of the first magnetic part close to the protruding part 2001 does not exceed the plane of the first prism close to the protruding part 2001. The first magnetic part can be connected to the first prism by an adhesive. The second magnetic part 2040 has the same structure as the first magnetic part 2030. The second magnetic part 2040 is fixed on the other side of the mounting hole by the mutual adsorption force with the first magnetic part 2030. The elongated part of the second magnetic part 2040 extends into the mounting hole 2002. The cap part of the second magnetic part 2040 abuts against the protruding part 2001. Preferably, there is a gap between the first magnetic part 2030 and the second magnetic part 2040. The size of the gap is obtained according to the mass of the first prism 201, the maximum acceleration borne by the mounting seat 200 during movement, the allowable stress of the material of the first prism 201, the acting area of the mutual adsorption force of the first magnetic part 2030 and the second magnetic part 2040 and the magnetic distance of the first magnetic part 2030 and the second magnetic part 2040. The gap ensures that the first prism 201 does not displace during movement and does not damage the first prism 201 which has a fragile material.

[0034] As shown in Figures 1-10 , the acting force F experienced by the first prism 201 during acceleration movement is 移 . The positive pressures (mutual adsorption forces) of the first magnetic part 2030 and the second magnetic part 2040 on the first prism are F1, F2, F3 and F4 respectively. In order to avoid displacement of the first magnetic part 2030 and the second magnetic part 2040, the sum (F1+F2+F3+F4) of the positive pressures of the first magnetic part 2030 and the second magnetic part 2040 on the first prism 201 is not less than the maximum acting force F experienced by the first prism 201 during acceleration movement.移 The maximum force F experienced by the first prism 201 in the acceleration motion 移 The product of the mass M1 of the first prism 201 and the maximum acceleration a experienced by the mounting base 200 in the motion is obtained. The maximum force F experienced by the first prism 201 in the acceleration motion 移 The minimum value of the mutual attraction of the pair of first magnetic member 2030 and second magnetic member 2040 can be obtained.

[0035] Since the material of the first prism 201 is usually relatively fragile, the mutual attraction of the first magnetic member 2030 and the second magnetic member 2040 is not the greater the better, and in order to avoid damaging the first prism 201, the maximum value of the mutual attraction of the first magnetic member 2030 and the second magnetic member 2040 is determined according to the allowable stress σ s of the first prism 201 (obtained according to the material query national standard table).

[0036] First, the stress σ 1-4 experienced by the first prism 201 due to the total mutual attraction (F1+F2+F3+F4) is obtained. 1-4 The stress σ experienced by the first prism 201 is obtained by the ratio of the total mutual attraction experienced by the first prism 201 to the action area A of the total mutual attraction experienced by the first prism 201. In order to avoid damaging the first prism 201, the stress σ 1-4 needs to be no greater than the allowable stress σ s of the first prism, and accordingly the maximum value of the mutual attraction of the pair of first magnetic member 2030 and second magnetic member 2040 can be obtained.

[0037] According to the relationship F d = K x (m1 x m2) / d 2 (between F d , the mutual attraction of the magnet; K is the constant of the magnet; m1 is the magnetic distance of the first magnetic member 2030; m2 is the magnetic distance of the second magnetic member 2040; d is the distance between the first magnetic member 2030 and the second magnetic member 2040), the appropriate range of the distance between the first magnetic member 2030 and the second magnetic member 2040 can be obtained. The distance between the first magnetic member 2030 and the second magnetic member 2040 is selected in the appropriate range of the distance between the first magnetic member 2030 and the second magnetic member 2040.

[0038] The distance d between the first magnetic member 2030 and the second magnetic member 2040 is preferably set between 0.36mm and 0.52mm, which is suitable for the material of the first prism 201 and the moving speed of the first moving member 20, and meanwhile avoids the first moving member 20 from being too large. The magnetic member can be a neodymium iron boron magnet, an aluminum-nickel-cobalt magnet, a ferrite magnet, etc.

[0039] The ear part 2011 of the first prism 201 is attached to the convex part 2001 of the bearing seat 200 by the magnetic attraction of the first magnetic member 2030 and the second magnetic member 2040, so that the position of the first prism 201 is fixed and is not affected by the installation precision of the first magnetic member 2030 and the second magnetic member 2040, and the installation precision is more controllable. Meanwhile, the first magnetic member 2030 and the second magnetic member 2040 have a spacing distance therebetween, which facilitates the control of the mutual attraction force of the first magnetic member 2030 and the second magnetic member 2040, so as to ensure that the first prism 201 does not displace during movement and meanwhile does not damage the first prism 201 which has a fragile material.

[0040] The second moving member 21 comprises a fixed seat 210, a second prism 211 and an adjusting mechanism 212. The fixed seat 210 is installed on the shell 1, the second prism 211 and the adjusting mechanism 212 are installed on the fixed seat 210, the fixed seat 210 comprises a mounting groove 2100 and a mounting member 2101, the mounting member 2101 is a hollow frame, and the second prism 211 is installed on the mounting member 2101. The adjusting mechanism 212 comprises oppositely arranged flexible adjusting members. The flexible adjusting members are located on opposite sides of the mounting member 2101, and two flexible adjusting members are arranged on the same side of the mounting member 2101. The flexible adjusting member comprises a flexible spring piece 2120 and an adjusting top screw 2121. The two ends of the flexible spring piece 2120 are fixed to the mounting member 2101 and the mounting groove 2100 respectively, the adjusting top screw 2121 is installed on a support member 2102 and is fixed by the support member 2102, the top of the adjusting top screw 2121 abuts against the flexible spring piece 2120, and the support member 2102 is fixed to the mounting groove 2100 by a locking member (not shown) and a locking hole 2103. Preferably, the adjusting top screw 2121 abuts against the middle position of the flexible spring piece 2120, so as to facilitate the adjustment of the position of the second prism 211. By adjusting the adjusting top screw 2121 acting on the flexible spring piece 2120, the flexible spring piece 2120 is deformed under stress, and the mounting member 2101 is displaced, so as to change the relative position of the second prism 211 and the first prism 201.

[0041] The flexible spring 2120 comprises a flexible part 2122 and fastening parts 2123 located at both ends of the flexible part 2122, the fastening parts 2123 comprising fixed end parts 2124 connected with the flexible part 2122 and reinforcing parts 2125 protruding inwardly on both sides of the fixed end parts, the flexible spring 2120 being connected with the mounting member 2101 and the mounting groove 2100 respectively through the reinforcing parts 2125. The flexible part 2122 is recessed from both sides of the fixed end parts 2124 to the middle, and the thickness of the flexible part 2122 is the largest at both ends and the smallest at the middle position.

[0042] The flexible spring 2120 needs to ensure the rigidity of connecting the mounting member 2101 and the mounting groove 2100, so that the position of the second prism 211 is not moved during the movement of the first moving member 20; at the same time, the flexible spring has the flexibility of deformation, which facilitates the adjustment of the position of the second prism 211. In order to achieve the above effect, it is necessary to determine whether the vertical rigidity of the flexible spring 2120 meets the requirements, if not, adjust the specification parameters of the flexible spring to meet the requirements, if it meets the requirements, obtain the horizontal rigidity of the flexible spring according to the gap change amount of the prism required to be met by the second prism 211, and obtain the length of the flexible spring according to the horizontal rigidity of the flexible spring. If the end width of the flexible part is b, the thickness is a, and the minimum thickness at the middle position is t, the recessed part of the flexible part in the middle is a circular arc shape, and the cutting radius is R.

[0043] The vertical rigidity of the flexible spring 2120 can be analyzed at the center angle θ1 of the circular arc with the lowest rigidity (the thickness t position) by the slice microelement method, as shown in the formula (1). Figure 11 The height of the microelement is:

[0044] C=t+2R-2Rcosθ1

[0045] The width of the microelement is:

[0046] du=d(Rsinθ1)=Rcosθ1dθ1

[0047] From the perspective of the microelement, the vertical force Ft can be converted into Mt around the X direction, and the deformation angle da of the X direction under the action of the microelement moment Mt is: t Which can be expressed as:

[0048]

[0049] Where E is the elastic modulus of the material;

[0050] I t is the inertia moment of the microelement interface along the X direction,

[0051] The micro-element deformation angle da t Amplified by the integral theorem:

[0052]

[0053] The deformation of the entire flexible spring is obtained. The vertical stiffness K1 of the flexible spring is the ratio of the micro-element moment M t around the Rx direction of the flexible spring to the deformation angle a t of the flexible spring Rx. According to the required adjustment range of the second prism, it is determined whether the vertical stiffness K1 of the flexible part meets the requirements.

[0054] After the vertical stiffness of the flexible spring meets the requirements, the length L between the ends of the fastening part of the flexible spring is calculated to make the flexible spring meet the horizontal stiffness requirements.

[0055] As shown in Figure 12 , the horizontal stiffness K2 is related to the overall mass M2 of the mounting seat 200 of the first moving part and the first prism, the maximum acceleration a of the first moving part, and the variable gap amount S of the prism, which is the allowable error range of the gap between the first prism and the second prism set according to optical requirements. The maximum and minimum values of the error range are the maximum and minimum values of the gap between the first prism and the second prism within the error allowable range. The specific calculation formula is:

[0056]

[0057] According to the relationship between the length and the stiffness of the flexible part:

[0058] L = AE / K2

[0059] In the formula: A = t x b is the cross-sectional area of the flexible part, E is the product of the material density and the corresponding empirical coefficient, which is a constant determined according to the material; L is the length of the flexible part.

[0060] The maximum acceleration a of the first moving part is determined according to the basic surface type of the workpiece to be processed for focus adjustment. The range of the length L of the flexible part is determined according to the range of the variable gap amount of the prism. That is, the maximum value of the length L of the flexible part is obtained according to the maximum value of the variable gap amount of the prism, and the minimum value of the length L of the flexible part is obtained according to the minimum value of the variable gap amount of the prism.

[0061] The flexible spring 2120 is fixed with the mounting member 2101 by a fixing nut, the mounting member 2101 has a notch accommodating the fixing nut, so that the second prism 211 is more closely attached to the mounting member 2101, and the fixing is more firm. Then the second prism 211 and the mounting member 2101 are fixed by glue, and after the glue is completely cured, the position of the second prism 211 is adjusted.

[0062] When adjusting the relative position of the second prism 211 and the first prism 201, the position of the second prism 211 is adjusted by four flexible adjusting members located at both ends of the second prism 211, and the second prism is adjusted in X direction, Y direction, Z direction and six degrees of freedom of rotation in each direction by adjusting the adjusting jacks of different flexible adjusting members.

[0063] The position of the second prism 211 is adjusted by the adjusting jacks 2121 acting on the flexible spring 2120, and the adjustment accuracy is higher through the deformation adjustment of the flexible spring 2120.

[0064] The first moving member of the focusing device is fixed by magnetic attraction, the ear part of the first prism is attached to the protruding part of the bearing seat by magnetic attraction, and the installation accuracy of the first prism can be ensured only by ensuring the machining accuracy of the first prism ear part and the bearing seat protruding part, which is not affected by the installation accuracy of the first magnetic member and the second magnetic member, and the installation accuracy is more controllable. At the same time, after the glue is cured, the relative position of the second prism and the first prism is adjusted by the adjusting mechanism, so that the gap between the second prism and the first prism has higher installation accuracy, is not affected by the irregular expansion of the cured glue, and is convenient to adjust.

Claims

1. An adjustment mechanism comprising at least one adjustment thumb screw, the adjustment mechanism characterized by: The adjusting mechanism further comprises flexible spring sheets corresponding to the adjusting top pins, the adjusting top pins abutting against the flexible spring sheets, the shape of the flexible spring sheets being changed by adjusting the adjusting top pins, the flexible spring sheets being fixed between the mounting groove and the mounting member, the flexible spring sheets and the mounting member being located in the mounting groove, the mounting member being used for mounting the component to be adjusted, the flexible spring sheets rigidly supporting the mounting member and the mounting groove and flexibly adjusting the mounting member.

2. The adjustment mechanism of claim 1, wherein: The adjusting mechanism comprises four groups of flexible spring sheets and adjusting top pins, two groups of which being located on opposite sides of the mounting member.

3. The adjustment mechanism of claim 2, wherein: The two groups of flexible spring sheets and adjusting top pins located on the same side are arranged at intervals.

4. The adjustment mechanism of claim 1, wherein: The flexible spring sheets are fixed with the mounting member through fixing nuts, the mounting member having notches accommodating the fixing nuts.

5. The adjustment mechanism of claim 1, wherein: The flexible spring sheets comprise flexible parts and fastening parts located at both ends of the flexible parts, the flexible parts being recessed from both side fixed end parts to the middle, the thickness of both ends of the flexible parts being the largest and the thickness of the middle position being the smallest.

6. The adjustment mechanism of claim 5, wherein: The fastening parts comprise fixed end parts connected with the flexible parts and reinforcing parts inwardly protruding from both sides of the fixed end parts.

7. The adjustment mechanism of claim 5, wherein: The flexible part has an end width of b and a thickness of a, with a minimum thickness of t at the middle position. The middle recess of the flexible part is arc-shaped with a cutting radius of R. The vertical stiffness of the flexible spring is the torque M of the infinitesimal element of the flexible spring about the Rx direction. t The deformation angle α in the Rx direction of the flexible spring t The ratio of the vertical stiffness of the flexible spring is obtained based on the following formula: wherein a t is the deformation angle of the flexible spring in the Rx direction, Mt is the moment of the microelement about the force in the Rx direction, E is the elastic modulus of the material; t is the minimum thickness of the flexible spring, R is the cutting radius of the flexible spring, θ1 is the central angle of the circular arc at the microelement slice, and θ2 is the central angle of the flexible part of the flexible spring.

8. The adjustment mechanism of claim 5, wherein: The length L of the flexible part of the flexible spring sheet is determined according to the cross-sectional area of the lowest vertical rigidity of the flexible spring sheet, the calculation method being L=AE / K2, wherein A=t×b is the cross-sectional area of the flexible part, E is the product of the material density and the corresponding experience coefficient, which is a constant determined according to the material; and K2 is the required rigidity requirement in the horizontal direction. horizontal stiffness where M2 is the total mass of the mounting base of the first moving member and the first prism, a is the maximum acceleration of the first moving member, and S is the variable gap amount of the prism.

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