High-precision optical lens outer diameter vector height measuring device

Abstract

The utility model discloses a high-precision optical lens outer diameter vector height measuring device, which comprises a base, and a light source assembly, a light conversion assembly, a lens positioning assembly and a camera assembly which are sequentially distributed along the direction of an optical axis, and is characterized in that the light source assembly can adjust the distance between the light source assembly and the light conversion assembly and is used for providing illumination light; the light conversion assembly is used for converting the illumination light into first light parallel to the optical axis; the lens positioning assembly is used for adsorbing the lens and can be used for leveling and centering the lens; the camera assembly can adjust the distance between the camera assembly and the lens positioning assembly and can collect the image of the lens so as to obtain the outer diameter and the rise of the lens. The device can improve the measurement precision of the outer diameter and the rise of the lens, is high in working efficiency, facilitates the guarantee of the yield of the lens, reduces the labor cost, and is wide in application range.

Description

Technical Field

[0001] The utility model belongs to the technical field of lens detection, and in particular relates to a high-precision optical lens outer diameter vector height measuring device. Background Art

[0002] In optical equipment, lenses are core, high-precision parts. During processing, high precision requirements are placed on the outer diameter and sagittal height of the lenses. Manual inspection can be used for some lenses that are large in size and small in number, but manual inspection is obviously inappropriate for lenses that are small in size and large in number.

[0003] Specifically, the current method for measuring the sagittal height of a lens is to first place the lens flat on the marble base of a micrometer, with the bottom surface of the lens contacting the marble platform, and using the micrometer to contact the convex vertex of the lens (visual vertex) to measure the total thickness of the lens; then place the lens upside down on the marble base, with the convex vertex of the lens contacting the marble platform, and using the micrometer to contact the concave vertex of the lens (visual vertex) to measure the middle thickness of the lens; the sagittal height is obtained by subtracting the middle thickness from the total thickness. This method has the following defects: 1) Both measurement positions are visual vertices, which lack accuracy, and there are large differences in the data obtained by different personnel. The measurement is unstable and greatly affected by personnel; 2) Contact measurement (micrometer contacts the upper and lower vertices of the lens) and lens inversion (upper convex surface contacts the marble table) have the risk of scratching the lens surface; 3) The operation is inconvenient, the efficiency is relatively low, and the labor cost is high. The outer diameter of optical lenses is generally measured using a micrometer. The lens is difficult to fix during measurement, and practitioners need to be skilled in operation. Due to personnel fluctuations or differences in measurement personnel, size differences will occur, resulting in large errors in measurement results. Therefore, in order to improve the measurement accuracy of the outer diameter and sagittal height of the lens, a high-precision optical lens outer diameter and sagittal height measuring device is proposed. Utility Model Content

[0004] The purpose of the utility model is to address the above-mentioned problems and to propose a high-precision optical lens outer diameter vector height measuring device, which can improve the measurement accuracy of the lens outer diameter and vector height, has high work efficiency, helps to ensure the lens yield, reduce labor costs, and has a wide range of applications.

[0005] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0006] The utility model proposes a high-precision optical lens outer diameter vector height measuring device, comprising a base, and a light source component, a light conversion component, a lens positioning component and a camera component sequentially distributed along the optical axis direction, wherein:

[0007] A light source assembly, comprising a first bracket, a light source and a first linear moving unit, wherein the first linear moving unit is connected to the base and is used to drive the first bracket to move along a first direction, and the light source is connected to the first bracket and is used to provide illumination light;

[0008] A light conversion assembly, comprising a second bracket and a lens unit connected to each other, the second bracket is connected to the base, and the lens unit is used to convert the illumination light into a first light parallel to the optical axis;

[0009] The lens positioning assembly comprises a correction unit, a hollow rotating platform and a tilt adjustment unit, wherein:

[0010] A tilt adjustment unit connected to the base and used to level the hollow rotating platform;

[0011] The hollow rotating platform comprises a motor, a lens support seat and a suction head, wherein the motor is connected to the tilt adjustment unit and is used to drive the lens support seat to rotate around a second direction, the suction head is located above the lens support seat and is coaxially detachably connected to the lens support seat, and the upper end of the suction head is used to absorb the lens, the second direction is perpendicular to the first direction, and the first light is used to irradiate the lens;

[0012] A correction unit is connected to the base and is used to correct the lens on the suction head so that the suction head and the lens are coaxial;

[0013] The camera assembly comprises a camera and a second linear moving unit, wherein the second linear moving unit is connected to the base and is used to drive the camera to move along a first direction, and the camera acquires an image of the lens to obtain an outer diameter and a sagittal height of the lens.

[0014] Preferably, the tilt adjustment unit includes a first adjustment seat, a second adjustment seat, a plurality of tightening units and a plurality of springs. The first adjustment seat is connected to the base, and the second adjustment seat is connected to the base through springs. The springs are symmetrically distributed on the second adjustment seat. The tightening units are divided into two groups and both can be moved and adjusted along the second direction. One group is symmetrically penetrated on the first adjustment seat and is in point contact with the second adjustment seat, and the other group is symmetrically penetrated on the second adjustment seat and is in point contact with the base. The horizontal adjustment of the second adjustment seat is achieved by threaded connection between the tightening unit and the first adjustment seat or the second adjustment seat, thereby achieving leveling of the lens.

[0015] Preferably, the tilt adjustment unit further includes a positioning ball, a first spherical groove is formed on the bottom wall of the second adjustment seat close to the first adjustment seat, a second spherical groove is formed on the base, and the positioning ball is built into the first spherical groove and the second spherical groove.

[0016] Preferably, the diameter of the positioning ball is the same as the diameter of the first spherical groove and the second spherical groove.

[0017] Preferably, the tightening unit includes a first adjusting screw and a locking nut, and the first adjusting seat and the second adjusting seat are both provided with a plurality of threaded connection sleeves, the first adjusting screw is passed through the first adjusting seat or the second adjusting seat and is threadedly connected to the locking nut, the threaded connection sleeve is threadedly connected to the first adjusting screw in a one-to-one correspondence, and the locking nut is located between the corresponding first adjusting screw and the threaded connection sleeve.

[0018] Preferably, the spring is a tension spring.

[0019] Preferably, the light source assembly also includes a second adjusting screw, a first through hole for a built-in light source is opened on the first bracket, the second adjusting screw is arranged perpendicular to the axial direction of the first through hole and is threadedly connected to the first bracket, and the center of the light source is adjusted by the second adjusting screw to align the optical axis of the lens unit.

[0020] Preferably, the correction unit includes a finger cylinder and a clamp, the clamp includes two V-shaped blocks arranged opposite to each other, the finger cylinder is connected to the base and is used to drive the two V-shaped blocks to move relative to each other to abut against the outer ring wall of the lens, the V-shaped block is detachably connected to the finger cylinder and is provided with a plurality of waist-shaped holes, the V-shaped block is adjusted by screws passing through the waist-shaped holes, and the waist-shaped holes are parallel to the moving direction of the V-shaped block.

[0021] Preferably, the camera assembly further comprises a lens and a third bracket, the third bracket is connected to the second linear moving unit, the lens is fixed on the third bracket, and the lens is connected to the camera and faces the lens.

[0022] Preferably, the light source is an LED light source.

[0023] Compared with the prior art, the beneficial effects of the utility model are:

[0024] The device includes a base, a light source assembly, a light conversion assembly, a lens positioning assembly and a camera assembly. Both the light source assembly and the camera assembly can be moved and adjusted to ensure that the light source is in the focal plane of the lens unit and at a suitable working distance of the camera. The lens unit can convert the illumination light emitted by the light source into parallel light, and provide stable and uniform illumination light, so that the camera can collect clear images, thereby realizing accurate measurement of the outer diameter and vector height of the lens, and the lens positioning assembly can further realize the centering of the lens and ensure the horizontality of the lens to improve the detection accuracy. It has high working efficiency and high detection accuracy, helps to ensure the lens yield and reduce labor costs, and the replaceable suction heads and fixtures are suitable for the measurement and processing of lenses of various specifications, and are easy to adjust. The whole device is stable and movable, and can be integrated in automated equipment to realize automated detection and processing. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a stereoscopic diagram of the high-precision optical lens outer diameter vector height measuring device of the utility model;

[0026] Figure 2 This is a front view of the high-precision optical lens outer diameter vector height measuring device of the utility model;

[0027] Figure 3 It is a top view of the high-precision optical lens outer diameter sagittal height measuring device of the utility model;

[0028] Figure 4 This is a structural schematic diagram of the tilt adjustment unit of the utility model;

[0029] Figure 5 For this utility model Figure 3 Partial cross-sectional view AA.

[0030] Explanation of the reference numerals: 10, light source assembly; 20, light conversion assembly; 30, lens positioning assembly; 40, camera assembly; 50, base; 11, first bracket; 12, light source; 13, first linear motion unit; 21, second bracket; 22, lens unit; 31, alignment unit; 32, hollow rotating platform; 33, tilt adjustment unit; 41, lens; 42, third bracket; 43, camera; 44, second linear motion unit; 311, finger cylinder; 312, clamp; 330, tightening unit; 331, first adjustment seat; 332, second adjustment seat; 333, first adjustment screw; 334, locking nut; 335, threaded sleeve; 336, spring; 337, positioning ball. DETAILED DESCRIPTION

[0031] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0032] It should be noted that when a component is referred to as being "connected" to another component, it may be directly connected to the other component or there may be an intermediate component. Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art in the technical field of this application. The terms used herein in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application.

[0033] like Figure 1-5 As shown, a high-precision optical lens outer diameter vector height measuring device includes a base 50, and a light source assembly 10, a light conversion assembly 20, a lens positioning assembly 30 and a camera assembly 40 sequentially distributed along the optical axis direction, wherein:

[0034] The light source assembly 10 includes a first bracket 11, a light source 12 and a first linear moving unit 13. The first linear moving unit 13 is connected to the base 50 and is used to drive the first bracket 11 to move along a first direction. The light source 12 is connected to the first bracket 11 and is used to provide illumination light.

[0035] The light conversion assembly 20 includes a second bracket 21 and a lens unit 22 connected to each other, the second bracket 21 is connected to the base 50, and the lens unit 22 is used to convert the illumination light into a first light parallel to the optical axis;

[0036] The lens positioning assembly 30 includes a correction unit 31, a hollow rotating platform 32 and a tilt adjustment unit 33, wherein:

[0037] A tilt adjustment unit 33 connected to the base 50 and used to level the hollow rotating platform 32;

[0038] The hollow rotating platform 32 includes a motor, a lens support seat and a suction head. The motor is connected to the tilt adjustment unit 33 and is used to drive the lens support seat to rotate around the second direction. The suction head is located above the lens support seat and is coaxially detachably connected to the lens support seat, and the upper end of the suction head is used to absorb the lens. The second direction is perpendicular to the first direction, and the first light is used to irradiate the lens.

[0039] The alignment unit 31 is connected to the base 50 and is used to align the lens on the suction head so that the suction head and the lens are coaxial;

[0040] The camera assembly 40 includes a camera 43 and a second linear moving unit 44. The second linear moving unit 44 is connected to the base 50 and is used to drive the camera 43 to move along a first direction. The camera 43 obtains the outer diameter and the sagittal height of the lens by collecting an image of the lens.

[0041] Among them, both the light source assembly 10 and the camera assembly 40 can realize movement and adjustment in the first direction, such as the first direction is the length direction of the base 50. Specifically, the first linear moving unit 13 is used to adjust the light source 12 to be placed at the focal plane of the lens unit 22. The lens unit 22 can be a prior art structure, which is used to convert the illumination light emitted by the light source 12 into parallel light. The lens positioning assembly 30 includes a correction unit 31, a hollow rotating platform 32 and a tilt adjustment unit 33. The tilt adjustment unit 33 is used to level the hollow rotating platform 32 and center the lens through the correction unit 31, thereby ensuring that the lens is level to improve the detection accuracy of the outer diameter and vector height of the lens. The motor of the hollow rotating platform 32 can be a hollow motor. A through hole penetrating the axis is provided on the lens support seat, so that the air pipe can pass through the hollow motor and the through hole in turn to communicate with the suction head to realize the adsorption or release of the lens on the suction head. The suction head can be quickly replaced for easy maintenance and adaptation to the adsorption of different lenses. A vent is provided in the suction head to facilitate the fixation of the lens after centering. The second linear moving unit 44 is used to adjust the working distance of the camera 43 to achieve better telecentricity and maintain the quality of the collected lens image.

[0042] In one embodiment, the tilt adjustment unit 33 includes a first adjustment seat 331, a second adjustment seat 332, a plurality of tightening units 330 and a plurality of springs 336. The first adjustment seat 331 is connected to the base 50, and the second adjustment seat 332 is connected to the base 50 through a spring 336. The springs 336 are symmetrically distributed on the second adjustment seat 332. The tightening units 330 are divided into two groups and both can be moved and adjusted along the second direction. One group is symmetrically arranged on the first adjustment seat 331 and is in point contact with the second adjustment seat 332, and the other group is symmetrically arranged on the second adjustment seat 332 and is in point contact with the base 50. The horizontal adjustment of the second adjustment seat 332 is achieved by threaded connection between the tightening unit 330 and the first adjustment seat 331 or the second adjustment seat 332, thereby achieving the leveling of the lens. The second adjustment seat 332 is leveled by adjusting and cooperating with the spring 336 and the top tightening unit 330. For example, each group has two top tightening units 330, and the two groups of top tightening units 330 are arranged side by side. There are six springs 336 and three springs 336 are arranged side by side on the bottom walls of both sides of the second adjustment seat 332. The two top tightening units 330 of one group are respectively against the upper wall of the second adjustment seat 332 (the side close to the camera assembly 40), and the two top tightening units 330 of the other group are respectively passed through the second adjustment seat 332 (the side close to the lens positioning assembly 30) and against the base 50. The structure is simple, and point contact can facilitate accurate adjustment. It is easy to understand that the tilt adjustment unit 33 can also be replaced by other structures in the prior art or obtained by simple deformation.

[0043] In one embodiment, the tilt adjustment unit 33 further includes a positioning ball 337, a first spherical groove is formed on the bottom wall of the second adjustment seat 332 close to the first adjustment seat 331, a second spherical groove is formed on the base 50, and the positioning ball 337 is built into the first spherical groove and the second spherical groove, which helps to ensure the adjustment accuracy of the tilt adjustment unit 33.

[0044] In one embodiment, the diameter of the positioning ball 337 is the same as the diameter of the first spherical groove and the second spherical groove, so as to achieve accurate matching support of the first adjustment seat 331 and the second adjustment seat 332 to prevent movement.

[0045] In one embodiment, the tightening unit includes a first adjusting screw 333 and a locking nut 334. The first adjusting seat 331 and the second adjusting seat 332 are both provided with a plurality of threaded connection sleeves 335. The first adjusting screw 333 is passed through the first adjusting seat 331 or the second adjusting seat 332 and is threadedly connected with the locking nut 334. The threaded connection sleeve 335 is threadedly connected with the first adjusting screw 333 in a one-to-one correspondence. The locking nut 334 is located between the corresponding first adjusting screw 333 and the threaded connection sleeve 335. The locking nut 334 can be locked after the first adjusting screw 333 is adjusted to prevent the first adjusting screw 333 from moving up and down, thereby ensuring the stability of the device.

[0046] In one embodiment, the spring 336 is a tension spring.

[0047] In one embodiment, the light source assembly 10 further includes a second adjusting screw, the first bracket 11 is provided with a first through hole for the built-in light source 12, the second adjusting screw is arranged perpendicular to the axial direction of the first through hole and is threadedly connected to the first bracket 11, and the center of the light source 12 is adjusted by the second adjusting screw to align the optical axis of the lens unit 22. This is convenient for ensuring that the center of the light source 12 is aligned with the optical axis, so that light is evenly transmitted to the lens unit 22.

[0048] In one embodiment, the correction unit 31 includes a finger cylinder 311 and a clamp 312, the clamp 312 includes two V-shaped blocks arranged opposite to each other, the finger cylinder 311 is connected to the base 50 and is used to drive the two V-shaped blocks to move relative to each other to abut against the outer ring wall of the lens, the V-shaped block is detachably connected to the finger cylinder and is provided with a plurality of waist-shaped holes, the V-shaped block is adjusted by screws passing through the waist-shaped holes, and the waist-shaped holes are parallel to the moving direction of the V-shaped block. The V-shaped block is provided with waist-shaped holes to facilitate the adjustment of the stroke to adapt to the correction of different lenses. The correction unit 31 can realize the coaxiality of the lens and the suction head to achieve stable adsorption and facilitate accurate measurement of the camera assembly 40.

[0049] In one embodiment, the camera assembly 40 further includes a lens 41 and a third bracket 42, the third bracket 42 is connected to the second linear motion unit 44, the lens 41 is fixed on the third bracket 42, and the lens 41 is connected to the camera 43 and faces the lens. The lens 41 can be a telecentric lens in the prior art, and its main feature is that no matter how the distance between the object and the lens changes, the magnification of the imaging will not be affected, which is particularly important for applications that require accurate measurement at different distances, ensuring the stability and reliability of the measurement results. The second linear motion unit 44 can adjust the working distance of the telecentric lens and the camera as a whole to achieve better telecentricity.

[0050] In one embodiment, the light source 12 is an LED light source. Other light sources known to those skilled in the art may also be used.

[0051] Working principle:

[0052] Adjust the light source assembly 10 so that the light source 12 is located at the focal plane of the lens unit 22, and the camera 43 is located at a suitable working distance, and then adjust the tilt adjustment unit 33 so that the hollow rotating platform 32 is in a horizontal position. Place the lens on the suction head, turn on the light source 12 to provide illumination light, and convert the illumination light into a first light parallel to the optical axis through the lens unit 22. After the lens on the suction head is corrected by the correction unit 31, the suction head absorbs the lens, the correction unit 31 releases the lens, and the camera 43 collects the image of the lens. The hollow rotating platform 32 can be rotated by several angles, and the image is collected after correction after each rotation angle. The final outer diameter and vector height of the lens are formed by collecting images of lenses in different orientations and taking the average value, which has high accuracy. The specific execution process can also be adjusted according to actual needs.

[0053] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0054] The above-described embodiments only express the more specific and detailed embodiments described in this application, but they cannot be understood as limiting the scope of the patent of this application. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of this application, which all belong to the protection scope of this application. Therefore, the protection scope of the patent of this application shall be based on the attached claims.

Claims

1. A high-precision optical lens outer diameter sagittal height measuring device, characterized in that: The high-precision optical lens outer diameter vector height measuring device comprises a base (50), and a light source assembly (10), a light conversion assembly (20), a lens positioning assembly (30) and a camera assembly (40) which are sequentially distributed along the optical axis direction, wherein: The light source assembly (10) comprises a first bracket (11), a light source (12) and a first linear moving unit (13); the first linear moving unit (13) is connected to a base (50) and is used to drive the first bracket (11) to move along a first direction; the light source (12) is connected to the first bracket (11) and is used to provide illumination light; The light conversion assembly (20) comprises a second bracket (21) and a lens unit (22) connected to each other, the second bracket (21) being connected to a base (50), and the lens unit (22) being used for converting the illumination light into a first light parallel to the optical axis; The lens positioning assembly (30) comprises a correction unit (31), a hollow rotating platform (32) and a tilt adjustment unit (33), wherein: The tilt adjustment unit (33) is connected to the base (50) and is used to level the hollow rotating platform (32); The hollow rotating platform (32) comprises a motor, a lens support seat and a suction head, wherein the motor is connected to the tilt adjustment unit (33) and is used to drive the lens support seat to rotate around a second direction, the suction head is located above the lens support seat and is coaxially detachably connected to the lens support seat, and the upper end of the suction head is used to absorb the lens, the second direction is perpendicular to the first direction, and the first light is used to irradiate the lens; The alignment unit (31) is connected to the base (50) and is used to align the lens on the suction head so as to achieve coaxiality between the suction head and the lens; The camera assembly (40) comprises a camera (43) and a second linear motion unit (44); the second linear motion unit (44) is connected to a base (50) and is used to drive the camera (43) to move along a first direction; the camera (43) acquires an image of the lens to obtain an outer diameter and a sagittal height of the lens.

2. The high-precision optical lens outer diameter sagittal height measuring device according to claim 1, characterized in that: The tilt adjustment unit (33) comprises a first adjustment seat (331), a second adjustment seat (332), a plurality of tightening units (330) and a plurality of springs (336); the first adjustment seat (331) is connected to the base (50); the second adjustment seat (332) is connected to the base (50) via the springs (336); the springs (336) are symmetrically distributed on the second adjustment seat (332); the tightening units (330) are divided into two groups and both can be moved and adjusted along the second direction; one group is symmetrically arranged on the first adjustment seat (331) and is in point contact with the second adjustment seat (332); the other group is symmetrically arranged on the second adjustment seat (332) and is in point contact with the base (50); the horizontal adjustment of the second adjustment seat (332) is achieved by threaded connection between the tightening units (330) and the first adjustment seat (331) or the second adjustment seat (332), thereby achieving the leveling of the lens.

3. The high-precision optical lens outer diameter sagittal height measuring device according to claim 2, characterized in that: The tilt adjustment unit (33) further comprises a positioning ball (337), a first spherical groove is provided on the bottom wall of the second adjustment seat (332) close to the first adjustment seat (331), a second spherical groove is provided on the base (50), and the positioning ball (337) is built into the first spherical groove and the second spherical groove.

4. The high-precision optical lens outer diameter sagittal height measuring device according to claim 3, characterized in that: The diameter of the positioning ball (337) is the same as the diameter of the first spherical groove and the second spherical groove.

5. The high-precision optical lens outer diameter sagittal height measuring device according to claim 2, characterized in that: The tightening unit comprises a first adjusting screw (333) and a locking nut (334); the first adjusting seat (331) and the second adjusting seat (332) are both provided with a plurality of threaded connection sleeves (335); the first adjusting screw (333) is passed through the first adjusting seat (331) or the second adjusting seat (332) and is threadedly connected to the locking nut (334); the threaded connection sleeve (335) is threadedly connected to the first adjusting screw (333) in a one-to-one correspondence; the locking nut (334) is located between the corresponding first adjusting screw (333) and the threaded connection sleeve (335).

6. The high-precision optical lens outer diameter sagittal height measuring device according to claim 2, characterized in that: The spring (336) is a tension spring.

7. The high-precision optical lens outer diameter sagittal height measuring device according to claim 1, characterized in that: The light source assembly (10) further comprises a second adjusting screw; the first bracket (11) is provided with a first through hole for internally housing the light source (12); the second adjusting screw is arranged perpendicular to the axial direction of the first through hole and is threadedly connected to the first bracket (11); the center of the light source (12) is adjusted by the second adjusting screw to align the optical axis of the lens unit (22).

8. The high-precision optical lens outer diameter sagittal height measuring device according to claim 1, characterized in that: The correction unit (31) comprises a finger cylinder (311) and a clamp (312), wherein the clamp (312) comprises two V-shaped blocks arranged opposite to each other, wherein the finger cylinder (311) is connected to the base (50) and is used to drive the two V-shaped blocks to move relative to each other so as to abut against the outer ring wall of the lens, wherein the V-shaped block is detachably connected to the finger cylinder (311) and is provided with a plurality of waist-shaped holes, wherein the V-shaped block is adjusted by screws passing through the waist-shaped holes, and the waist-shaped holes are parallel to the moving direction of the V-shaped block.

9. The high-precision optical lens outer diameter sagittal height measuring device according to claim 1, characterized in that: The camera assembly (40) further comprises a lens (41) and a third bracket (42), wherein the third bracket (42) is connected to a second linear moving unit (44), the lens (41) is fixed on the third bracket (42), and the lens (41) is connected to a camera (43) and faces the lens.

10. The high-precision optical lens outer diameter sagittal height measuring device according to any one of claims 1 to 9, characterized in that: The light source (12) is an LED light source.

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