Biaxial orthogonal manual adjustment universal platform for optical lens detection

Abstract

The invention discloses a biaxial orthogonal manual adjustment universal platform for lens detection. The biaxial orthogonal manual adjustment universal platform comprises a main shell, an orthogonal deflection assembly and a fine adjustment driving system. The orthogonal deflection assembly is installed on the main shell through an orthogonal bearing, a table top of the orthogonal deflection assembly is used for bearing a to-be-measured lens, and the intersection point of two rotation axes of the orthogonal bearing forms a fixed geometric center point. The fine adjustment driving system comprises two sets of precise fine adjustment screw pairs arranged at a horizontal included angle and a counter-force tension spring, the ball head ends of the screw pairs make tangent contact with the inclined face of a swing block fixed to the lower end of the swing shaft, and the counter-force tension spring provides pre-tightening force to eliminate a transmission gap. By means of the structure, linear feeding of the screw pair is converted into pure rotation motion of the table board around the geometric center point, and double-shaft orthogonal adjustment of pitching and deflection is achieved. The device is compact in structure, is provided with a very small Abbe arm, effectively eliminates Abbe errors, is simple and convenient to operate, is high in adjustment precision, is low in cost, and is especially suitable for small-batch, multi-specification, rapid and high-precision online detection of optical lenses.

Description

Technical Field

[0001] This invention relates to the field of optical inspection and precision instrument technology, specifically to a dual-axis orthogonal manual adjustment universal platform for optical lens inspection, suitable for optical component inspection and positioning applications requiring high precision and multi-degree-of-freedom adjustment. Background Technology

[0002] Optical lens inspection is a crucial step in optical manufacturing, with its core challenge lying in achieving multi-dimensional, sub-micron level precision positioning. The curvature variations and optical properties of the lens surface demand extremely high positioning accuracy from the inspection system; even the slightest positional deviation can distort the inspection results. During inspection, all six degrees of freedom of the lens need precise control. Translation along the X / Y / Z axes and rotation along the RZ axis can be achieved using linear displacement stages and rotary elements (such as bearings). However, if RX and RY cannot be orthogonally adjusted, resulting in a large Abbe arm in the system, it will introduce Abbe error into the inspection, directly affecting its accuracy.

[0003] Currently, common optical adjustment devices mainly include motorized multi-axis adjustment stages and manually stacked adjustment platforms. While motorized multi-axis adjustment stages offer high adjustment accuracy and automation, their complex structure, high cost, and demanding operation and maintenance requirements make them unsuitable for online inspection needs involving small batches, multiple specifications, and rapid response. Existing manually stacked adjustment platforms often employ a stacked structure, achieving multi-degree-of-freedom adjustment through the superposition of multiple single-axis adjustment modules. This type of structure struggles to guarantee the orthogonality of rotations around the X and Y axes during adjustment, leading to misalignment of adjustment centers and the formation of large Abbe arms, thus introducing significant Abbe errors. To compensate for this error, operators must repeatedly adjust the translations in the X and Y directions, resulting in low adjustment efficiency and severely impacting the final positioning accuracy.

[0004] Therefore, there is a lack of a compact, easy-to-operate, and cost-effective manual universal platform that can achieve orthogonal adjustment around the X and Y axes to meet the urgent needs for high precision, high efficiency, and small Abbe error in optical lens inspection. Summary of the Invention

[0005] To address the high cost and complex operation of existing electric adjustment stages, as well as the technical shortcomings of manual stacking adjustment stages such as excessively large Abbe arms and non-orthogonal degrees of freedom, this invention aims to provide a dual-axis orthogonal manual adjustment universal platform for optical lens inspection. Employing an orthogonal yaw structure, coupled with tension springs and fine-tuning bolts, the platform allows for independent fine-tuning of the rotation axis in both eccentricity and tilt aspects. This achieves orthogonal adjustment of the rotation axis around the X and Y axes (i.e., pitch and yaw), fundamentally reducing Abbe error and meeting the urgent needs for high precision, high efficiency, and rapid response in small-batch optical lens inspection.

[0006] This invention is achieved through the following technical solution: A biaxial orthogonal manually adjustable universal platform for optical lens inspection, characterized in that it includes: main housing; An orthogonal yaw assembly includes a platform mounted on the main housing via an orthogonal bearing. The fixed part of the orthogonal bearing is connected to the main housing, and the movable part is connected to the platform. The intersection of the two rotation axes of the bearing constitutes a geometric center point located below the platform. The fine-tuning drive system includes two sets of precision fine-tuning screw pairs and a reaction spring; the two sets of precision fine-tuning screw pairs are arranged on the main housing at a horizontal angle of 30° to 150° and act on a force-bearing part of the orthogonal yaw assembly respectively; the reaction spring is connected between the main housing and the force-bearing part of the orthogonal yaw assembly and provides a preload force to keep the force-bearing part pressed against the end of the precision fine-tuning screw pair. The contact point between the end of the precision fine-tuning screw pair and the force-bearing part, the axis of the precision fine-tuning screw pair, and the geometric center point of the orthogonal bearing form a lever transmission relationship, so that the linear feed motion of the precision fine-tuning screw pair is converted into the pure rotational motion of the table about the geometric center point.

[0007] Furthermore, the orthogonal oscillating component also includes a oscillating shaft, one end of which is connected to the platform, and the other end is fixedly provided with an oscillating block, which constitutes the force-bearing part of the fine-tuning drive system; the oscillating block has at least two non-parallel driving inclined surfaces, and the end of the precision fine-tuning screw pair is in tangential contact with the driving inclined surfaces.

[0008] Furthermore, the angle between the driving inclined plane and the horizontal plane is 60°.

[0009] Furthermore, the pendulum block has four driving inclined surfaces, arranged symmetrically in pairs, and the axis of the precision fine-tuning screw pair is perpendicular to the corresponding driving inclined surface.

[0010] Furthermore, the orthogonal bearing is a composite hinge structure, comprising an outer ring, an inner ring, and two pairs of pivot pins; the outer ring is fixedly connected to the main housing; the two pairs of pivot pins are perpendicularly inserted between the outer ring and the inner ring, enabling the inner ring to rotate relative to the outer ring around two orthogonal axes.

[0011] Furthermore, the reaction spring is located between the two sets of precision fine-tuning screw pairs and connected to one corner of the force-bearing part to provide a restoring force pointing in the direction of the two sets of precision fine-tuning screw pairs.

[0012] Furthermore, the end of the precision fine-tuning screw pair has a ball head structure.

[0013] Furthermore, the distance between the bearing surface of the lens under test on the platform and the geometric center point of the orthogonal bearing is less than 20mm, in order to achieve the small Abbe arm required for submicron-level positioning accuracy.

[0014] Furthermore, the precision fine-tuning screw assembly is a manually adjustable screw structure, or it can be replaced by one of an electric actuator, a piezoelectric actuator, or a voice coil motor.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows; 1) By using the orthogonal bearing design of inner and outer rings and vertical pivot pins, the rotation centers of the two rotational degrees of freedom of pitch (RX) and yaw (RY) are brought together at one point, realizing true concentric orthogonal adjustment of the rotating shafts, thus eliminating the Abbe error caused by the misalignment of the shaft system in principle.

[0016] 2) By utilizing the ball joint of the precision fine-tuning screw pair tangentially engaged with the 60° inclined plane of the pendulum block, and combining it with a reaction spring to provide constant reaction force, a backlash-free, highly sensitive transmission pair is formed. This mechanism efficiently and accurately converts the linear displacement of the screw into the angular displacement of the pendulum block, achieving sub-micron level fine adjustment. The two sets of fine-tuning screw pairs are arranged orthogonally at a 30° horizontal angle, forming a stable triangular geometric relationship with the bearing center. This not only results in a compact structure and reduced Abbe arm, but also ensures that the two adjustment directions are independent and do not interfere with each other, improving adjustment linearity and making operation intuitive.

[0017] 3) This invention can be adjusted manually without the need for a complex control system. The two adjustment knobs independently control the pitch and yaw, and the adjustment process does not interfere with each other, with a fast response, making it particularly suitable for rapid online detection and positioning of small batches of products with multiple specifications.

[0018] Eliminating the need for expensive electric drives and complex control systems, this system achieves the same precision through a sophisticated mechanical structure, significantly reducing manufacturing costs and simplifying maintenance. The preload of the reaction spring ensures the drive chain remains taut at all times, eliminating backlash and providing the platform with extremely high stability after adjustment and during operation. The manual precision screw can be replaced with a motor to achieve rapid and controllable adjustment, depending on the specific needs. This is a highly efficient, stable, and high-precision universal adjustment stage for optical lens inspection. Attached Figure Description

[0019] Figure 1 This is an exploded view of the structure of the biaxial orthogonal manually adjustable universal platform for optical lens inspection according to the present invention. Figure 2 This is a cross-sectional view of the biaxial orthogonal manually adjustable universal platform for optical lens inspection according to the present invention; Figure 3 This is a schematic diagram of the orthogonal bearing portion of the present invention; Figure 4 This is a schematic diagram illustrating the adjustment principle of the present invention; Figure 5 This is a schematic diagram of the biaxial orthogonal manually adjustable universal platform for optical lens inspection according to the present invention; The components in the diagram are: 1. Fine-tuning drive system, 2. Orthogonal yaw assembly, 3. Platform, 4. Orthogonal bearing, 5. Flange shaft, 6. Main housing, 7. Precision fine-tuning screw assembly, 8. Reaction spring, 9. Swing block, 10. Outer ring, 11. Rotating pin, and 12. Inner ring. Detailed Implementation

[0020] The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings. This description is intended to provide those skilled in the art with sufficient information to implement the invention, but should not be construed as limiting the scope of protection of the invention.

[0021] like Figure 1 and Figure 2 As shown, the core of this invention's platform lies in achieving dual-axis pure rotational motion through a fixed spatial geometric center point. The platform mainly consists of a main shell 6 serving as the basic support structure, an orthogonal yaw assembly 2 that enables concentric rotation of the axes, and a fine-tuning drive system 1 that achieves high-precision, backlash-free drive. Employing an orthogonal yaw structure, coupled with tension springs and fine-tuning bolts, the platform allows for independent fine-tuning of the axis concentricity in both eccentricity and tilt aspects, achieving efficient, stable, and high-precision universal adjustment for lens inspection.

[0022] like Figure 2 As shown, the orthogonal yaw assembly 2 includes: a platform 3, an orthogonal bearing 4, a flange shaft 5, and a yaw block 9. The flange shaft 5 passes through the orthogonal bearing 4 and connects to the platform 3, which is used to place the lens to be tested. The orthogonal bearing 4 is mounted on the main housing 6. The spatial intersection of the two rotation axes of the orthogonal bearing 4 constitutes the geometric center point O of the platform (see...). Figure 4 This point forms the theoretical basis and structural guarantee for achieving small Abbe error adjustment.

[0023] The tabletop 3 is made of stainless steel or Invar, a material with a low coefficient of thermal expansion, and is precision machined. Its upper surface is equipped with an array of M4 or M6 threaded holes, or can be integrated with vacuum suction holes to accommodate the quick clamping of lenses of different specifications.

[0024] The upper end of the flange shaft 5 is machined into a flange, which is adjusted to be coaxial with the platform 3 and then locked and connected. Its lower end face is machined into a square cross section and is installed together with the swing block 9. The force-bearing part of the swing block 9 is made of GCr15 bearing steel in this embodiment and is quenched and tempered to HRC58-62 to ensure that its inclined surface has extremely high hardness, wear resistance and dimensional stability.

[0025] The four outer driving inclined surfaces of the swing block 9 each have an angle of 60° with the horizontal plane, and the four inclined surfaces are parallel to each other and are parallel to the two theoretical rotation axes of the orthogonal bearing 4. The inner side of the swing block 9 is machined into a concave square shape, and is press-fitted with the square section at the lower end of the flange shaft 5 using a small interference fit to ensure that the two become one piece.

[0026] Orthogonal bearing 4, such as Figure 4 As shown, a composite hinge structure comprises an outer ring 10, an inner ring 12, and two pairs of pivot pins 11. The two pairs of pivot pins 11 are perpendicular to each other and pass through the outer ring 10 and inner ring 12 respectively, forming a rotating hinge. The two ends of the pivot pins 11 form a clearance fit (H7 / g6) with the pin holes on the outer ring 10 and inner ring 12, thus forming a low-friction rotating hinge with two degrees of freedom. The outer ring 10 is pressed into the precision-bored hole at the top of the main housing 6 through an interference fit, achieving initial positioning and fixation. The inner ring 12 can rotate about the axis of one set of pivot pins (achieving pitch), while the inner ring-outer ring assembly can rotate about the axis of the other set of pivot pins (achieving yaw). The flange shaft 5 passes through the center hole of the inner ring 12 and is clamped and fixed from both the top and bottom by a pair of locking nuts, thereby constraining the rotation center of the entire orthogonal yaw assembly 2 to the geometric center point O.

[0027] The fine-tuning drive assembly 1 includes: two sets of precision fine-tuning screws 7 and a reaction spring 8.

[0028] Two threaded holes for installing precision fine-tuning screw pairs 7 are machined on the side wall of the main housing 6. The projection angle between the axes of the two holes on the horizontal plane is 30°, and the vertical angle of each axis is calculated to ensure that it is precisely perpendicular to the corresponding 60° drive slope on the swing block 9.

[0029] In this embodiment, the precision fine-tuning screw assembly 7 uses a commercially available microhead with a screw lead (pitch) of 0.5 mm and a ball end made of tungsten carbide. During installation, the ball end is advanced by rotating the screw until it makes tangential contact with the precision inclined surface of the swing block 9. This "ball end-inclined surface" configuration transforms potential sliding friction into point contact, reducing starting friction and hysteresis effects, and achieving sub-micron level sensitive adjustment.

[0030] The reaction spring 8 is located between two sets of precision fine-tuning screw pairs 7. Its two ends are connected by hooks to a special lug on the inside of the main housing 6 and a corner of the bottom of the swing block 9, respectively. After installation, the spring is pre-stretched to about 15% of its free length, thereby generating a constant preload. This force provides a restoring force to the swing block 9 in the direction of the two screw pairs, ensuring that in any adjustment state, the two drive ramps of the swing block 9 can simultaneously press against the two ball heads, achieving backlash-free transmission throughout the entire stroke.

[0031] like Figure 4As shown, the adjustment process of this invention is essentially a spatial lever motion. The ball head of the precision fine-tuning screw pair 7 is tangent to the inclined surface of the swing block 9, and the line connecting the contact points passes through the center of the axis of the screw pair 7, forming a right-angled triangle geometric relationship with the geometric center point of the orthogonal bearing 4.

[0032] The adjustment method described in this invention is as follows: Each component is installed on the structural parts according to its theoretical position. After precision machining or centering, the orthogonal bearing 4 ensures the coaxiality of its inner ring 12 and outer ring 10 and the orthogonality of the pivot pin 11, as well as the coaxial fit between the outer ring 10 and the main housing 6. The reaction spring 8 is in a stretched state after installation to ensure balance and preload. At this time, the platform 3 is in a horizontal zero position. After placing the optical element under test on the platform 3, the pitch and yaw parameters are adjusted according to the requirements of the testing instrument, that is, the two precision fine-tuning screw pairs 7 are adjusted respectively. By rotating the precision fine-tuning screw pairs 7, the fine-tuning screws are extended and retracted along the axis, maintaining real-time tangency with the swing block 9. With the reaction force provided by the reaction spring 8, the yaw or pitch adjustment of the optical element under test is realized.

[0033] according to Figure 4 The geometric relationship shown can be used to deduce the relationship between the horizontal push / pull distance and the ball head rise / fall distance: like Figure 5 As shown, in the initial state: the straight-line distance from the ball joint tangent point to the pivot point is r, and the angle between the line connecting the ball joint tangent point to the pivot point and the flange shaft in the initial state is θ. Given that the screw pitch is d, the number of rotations is n, and the angle between the line connecting the ball joint tangent point to the pivot point and the flange shaft after adjustment is Δθ, then: the rotation angle of the platform in one direction is α. Therefore, the relationship is derived as follows:

[0034] The above-described specific implementations can be partially adjusted by those skilled in the art in different ways without departing from the principles and purpose of the present invention. The scope of protection of the present invention is defined by the claims and is not limited to the above-described specific implementations. All implementation schemes within the scope of the claims are bound by the present invention.

Claims

1. A biaxial orthogonal manual adjustment gimbaling platform for optical lens detection, characterized in that, The application relates to a micro-adjustment drive system for a lens testing device, which comprises the following components: a main housing (6); an orthogonal swing assembly (2) comprising a table (3) mounted on the main housing (6) through an orthogonal bearing (4), a fixed part of the orthogonal bearing (4) being connected with the main housing (6), a movable part being connected with the table (3), and the intersection of two rotation axes of the orthogonal bearing (4) constituting a geometric center point below the table (3); and a micro-adjustment drive system (1) comprising two sets of precision micro-adjustment screw pairs (7) and a counterforce tension spring (8), the two sets of precision micro-adjustment screw pairs (7) being arranged on the main housing (6) at a horizontal included angle of 30-150 DEG and respectively acting on a force receiving part of the orthogonal swing assembly (2), and the counterforce tension spring (8) being connected between the main housing (6) and the force receiving part of the orthogonal swing assembly (2) and providing a pre-tightening force for pressing the force receiving part against the end part of the precision micro-adjustment screw pair (7). The end part of the precision micro-adjustment screw pair (7) is in contact with the force receiving part, the axis of the precision micro-adjustment screw pair (7) and the geometric center point of the orthogonal bearing (4) constitute a lever transmission relationship, so that the linear feeding motion of the precision micro-adjustment screw pair (7) is converted into the pure rotation motion of the table (3) around the geometric center point. The orthogonal swing assembly (2) further comprises a swing shaft, one end of the swing shaft being connected with the table (3) and the other end being fixedly provided with a swing block (9) constituting the force receiving part of the micro-adjustment drive system, the swing block (9) having at least two non-parallel driving inclined surfaces, and the end part of the precision micro-adjustment screw pair (7) being in tangential contact with the driving inclined surfaces. The included angle between the driving inclined surface and the horizontal plane is 60 DEG. The driving inclined surface of the swing block (9) is four, two by two symmetrical arrangement, and the axis of the precision micro-adjustment screw pair (7) is perpendicular to the corresponding driving inclined surface.

2. Double-axis orthogonal manual adjustment gimballed platform for the detection of optical lenses according to claim 1, characterized in that, The orthogonal bearing (4) is a composite hinge structure, which comprises an outer ring (10), an inner ring (12) and two pairs of rotating pins (11), the outer ring (10) being fixedly connected with the main housing (6), and the two pairs of rotating pins (11) being perpendicularly arranged between the outer ring (10) and the inner ring (12), so that the inner ring (12) can rotate relative to the outer ring (10) around two orthogonal axes.

3. Biaxial orthogonal manual-adjustment gimballed platform for the detection of optical lenses according to claim 2, characterized in that, The counterforce tension spring (8) is located between the two sets of precision micro-adjustment screw pairs (7) and is connected on one corner of the force receiving part, so as to provide a restoring force pointing to the combined direction of the two sets of precision micro-adjustment screw pairs (7).

4. Double-axis orthogonal manual-adjustment goniometric platform for the detection of optical lenses according to claim 2, characterized in that, The end part of the precision micro-adjustment screw pair (7) is in a ball head structure.

5. Double-axis orthogonal manual-adjustment goniometric platform for the detection of optical lenses according to claim 1, characterized in that, The distance between the lens bearing surface of the table (3) to be tested and the geometric center point of the orthogonal bearing (4) is less than 20 mm, so as to realize the small Abbe arm required by the sub-micron positioning accuracy.

6. Biaxial orthogonal manual-adjustment gimballed platform for the detection of optical lenses according to claim 1, characterized in that, The precision micro-adjustment screw pair (7) is in a manual adjusting screw structure, or can be replaced by one of an electric actuator, a piezoelectric actuator and a voice coil motor.

7. Biaxial orthogonal manual-adjustment gimballed platform for the detection of optical lenses according to claim 1, characterized in that, ​ 8. Double-axis orthogonal manual-adjustment goniometric platform for the detection of optical lenses according to claim 1, characterized in that, ​ 9. The biaxial, orthogonally-manually-adjusted gimbal platform according to claim 1, wherein, ​

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