Device and method for detecting eccentricity of small-aperture lens

Abstract

The present application relates to the technical field of optical parts processing, and specifically to a device and method for detecting the eccentricity of a small-diameter lens. The device for detecting the eccentricity of a small-diameter lens of the present application comprises a plane window and a clamp, wherein the upper surface of the plane window is used to fix and install the lens to be detected; the bottom of the clamp is a bearing window for fixedly installing and cooperating with the eccentric clamp of the eccentricity detector, and two elastic clips are arranged on the bearing window, wherein one end of each elastic clip is fixedly connected to the bearing window, and the other end can be movably pressed on the top of the plane window so as to fix and clamp the plane window between the bearing window and the elastic clip, and at the same time press on different parts of the outer circumferential wall of the lens to be detected above the plane window, so as to position the rotation of the lens to be detected during detection. The device of the present application can detect the eccentricity of a small flat concave or flat convex lens with an aperture less than 2 mm, and the operation is simpler, and the detection accuracy and efficiency are improved.

Description

Technical Field

[0001] The present application relates to the technical field of optical parts processing, and in particular to a device and method for detecting eccentricity of a small-aperture lens. Background Art

[0002] In the field of optical parts processing, eccentricity is one of the important indicators of optical parts. It refers to the deviation between the optical axis and the geometric axis of the curved surface of the optical part due to errors in the processing process. In order to ensure the quality of optical products, it is usually necessary to detect the center deviation of the processed products.

[0003] At present, there are mainly the following ways to measure eccentricity. In the rough processing stage, the outer diameter and R value are used for positioning. The edge of the lens to be tested is supported by a micrometer measuring head. The lens rotates one circle, and the amount of fluctuation of the micrometer value is the edge thickness difference. The inclination angle and eccentricity of the product surface can be calculated based on the edge difference value. In the finished product inspection stage, the lens to be tested is placed on a fixture with matching caliber, and then the fixture is fixed on the eccentricity measuring instrument. By rotating the lens to be tested, the eccentricity measuring instrument calculates the eccentricity value based on the offset of the laser transmission beam.

[0004] However, for products with smaller lens diameters, for example, products with diameters less than 2 mm, on the one hand, since the diameter is too small, it exceeds the measurement range of 2.5 mm to 150 mm of conventional eccentric fixtures, and it is impossible to use conventional inspection fixtures to locate the outer diameter surface of the single lens for measurement. On the other hand, during the rotation process of the eccentricity test, since the lens is small and light, it often cannot be rotated or the lens is very easy to jump. At the same time, it requires high manual operation, resulting in the inability to accurately test the eccentricity value and low detection efficiency.

[0005] Therefore, how to improve the operability of small-aperture lens eccentricity testing and improve the detection efficiency is a technical problem that needs to be solved urgently by those skilled in the art. Summary of the invention

[0006] One of the purposes of the present invention is to overcome the above disadvantages and provide a device and method for detecting the eccentricity of a small-aperture lens, which can perform eccentricity detection on a small plano-concave or plano-convex lens with an aperture less than 2 mm, making the operation simpler and improving the detection accuracy and efficiency.

[0007] In order to solve the above technical problem, the present invention provides a lens eccentricity detection device, comprising a plane window sheet (1) for fixing and mounting a lens (3) to be detected, and a fixture (2) for fixing the plane window sheet (1) to an eccentricity fixture of an eccentricity detector and positioning the rotation of the lens (3) to be detected;

[0008] The plane window (1) is a flat transparent material, and its upper surface is used for fixing and mounting the lens (3) to be inspected;

[0009] The clamp (2) has a bottom portion for a bearing window (21) for fixedly mounting and cooperating with an eccentric clamp of an eccentric detector. The bearing window (21) is provided with two elastic clips (22). One end of each elastic clip (22) is fixedly connected to the bearing window (21), and the other end of each elastic clip (22) can be movably pressed on the top of the plane window (1) so as to fix and clamp the plane window (1) between the bearing window (21) and the elastic clip (22). The other ends of the two elastic clips (22) are The ends of the two elastic clips (22) are respectively pressed against different parts of the outer circumferential wall of the lens to be detected (3) fixedly mounted above the plane window sheet (1) to position the rotation of the lens to be detected (3) during detection, and the connecting line between the pressing point of the lens to be detected (3) and the center of the lens to be detected (3) at the other ends of the two elastic clips (22) is not on a straight line; the bearing window sheet (21) is a transparent light-transmitting part or a hollow part at least at the part directly below the lens to be detected (3).

[0010] Furthermore, the lens to be inspected (3) is fixedly mounted on the upper surface of the plane window sheet (1) by means of a glue-like substance.

[0011] Furthermore, the plane window (1) and the carrier window (21) are made of K9 glass.

[0012] Furthermore, the lens to be detected is a plano-concave lens or a plano-convex lens, and the aperture of the lens to be detected is less than 2 mm.

[0013] Accordingly, the present application also provides a method for detecting eccentricity of a small-aperture lens using the eccentricity detection device according to any one of claims 1 to 4, comprising the following steps:

[0014] Step 1, fixing the lens to be detected (3) on the upper surface of the plane window (1), wherein the lens to be detected (3) is a plano-concave lens or a plano-convex lens;

[0015] Step 2, placing the plane window sheet (1) with the lens (3) to be inspected bonded thereto upwards between the supporting window sheet (21) and the elastic clip (22) of the fixture (2), and fixing it by utilizing the elastic force of the elastic clip (22), while making the other ends of the two elastic clips (22) press against different parts of the outer circumferential wall of the lens (3) to be inspected respectively;

[0016] Step 3, fix the bearing window (21) of the fixture (2) on the eccentric fixture (5) of the eccentric detector (4), and adjust the position of the eccentric fixture (5) of the eccentric detector (4) so ​​that the laser light source of the eccentric detector (4) is located above the lens (3) to be detected, and the detection laser beam emitted by the laser light source of the eccentric detector (4) just vertically passes through the center point of the lens (3) to be detected, and is imaged on the imaging system located below the lens (3) to be detected;

[0017] Step 4: Push the flat window sheet to drive the lens to be detected (3) to rotate at least 360 degrees around the center of the lens to be detected (3), and during the rotation, the other ends of the two elastic clips (22) are respectively kept in contact with the outer peripheral wall of the lens to be detected (3), and the eccentricity value of the lens to be detected (3) is obtained according to whether the imaging position of the detection laser beam displayed by the imaging system of the eccentricity detector (4) during the rotation is eccentric and the eccentricity position.

[0018] The beneficial effects of the technical solution of the present invention are:

[0019] 1. By gluing the small lens to be tested to the flat window, the small plane of the product to be tested is transformed into a large plane of the flat window. The structure is more stable, which is convenient for manual operation during the positioning and rotation test of the fixture, and the operation is more controllable, which improves the test efficiency.

[0020] 2. The bearing window of the fixture is matched with the conventional fixture of the eccentricity tester, and the outer diameter of the small lens to be tested is positioned by two clamps to ensure that the small lens to be tested will not be offset during the test rotation process, which can improve the test accuracy of the small lens eccentricity value. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 The present invention is a schematic diagram of assembling a small-aperture lens eccentricity detection device and a lens to be detected.

[0022] Figure 2 The present invention is a top view of an eccentricity detection device for a small-aperture lens assembled with a lens to be detected.

[0023] Figure 3 The present invention is a side view of an eccentricity detection device for a small-aperture lens assembled with a lens to be detected.

[0024] Figure 4 It is a schematic diagram of a method for detecting eccentricity of a small-aperture lens according to the present invention.

[0025] Among them, 1 is a plane window, 2 is a fixture, 21 is a bearing window, 22 is an elastic clip, 3 is a lens to be tested, 4 is an eccentricity tester, and 5 is an eccentricity fixture. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0027] like Figures 1 to 3 The figure is a schematic diagram of an assembly of an eccentricity detection device for a small-diameter lens and a lens to be detected according to the present invention, wherein the eccentricity detection device for a small-diameter lens comprises a plane window (1) for fixing and mounting the lens to be detected (3) and a fixture (2) for fixing the plane window (1) to an eccentricity fixture (5) of an eccentricity detector (4) and positioning the rotation of the lens to be detected (3);

[0028] The plane window (1) is a flat transparent material, and its upper surface is used to fix the lens to be tested (3); the shape of the plane window is not limited here, but in order to facilitate the subsequent test rotation operation, a circular window is usually used. Preferably, the lens to be tested is a small plano-concave lens or a small plano-convex lens, and the diameter of the small lens is less than 2 mm. The lens to be tested is fixed on the surface of the plane window (1) by gluing in a manner that the plane is downward and the concave or convex surface is upward, and the gluing position is as close to the center of the plane window as possible. In order to ensure that the light source of the eccentricity tester can observe the imaging of the plano-convex / plano-concave lens through the plane window (1), K9 material glass can be selected as the manufacturing material of the plane window (1).

[0029] The clamp (2) has a bottom portion which is a bearing window (21) for fixedly mounting and cooperating with the eccentric clamp of the eccentric detector. The bearing window (21) is usually semicircular and made of K9 glass. Two elastic clips (22) are arranged on the bearing window (21). One end of each elastic clip (22) is fixedly connected to the bearing window (21). The specific connection method can be common methods such as gluing or screw fixing. The other end can be movably pressed on the top of the plane window (1) so that the plane window (1) is fixedly clamped between the bearing window (21) and the elastic clip (22). The ends of the other ends of the two elastic clips (22) are pressed on different parts of the outer circumferential wall of the lens (3) to be detected which is fixedly mounted on the plane window (1). The plane window (1) is fixed between the bearing window (21) and the elastic clip (22) by elastic force. At the same time, the plane window (1) is used to position the rotation of the lens (3) to be detected during detection. In addition, in order to allow the flat window sheet (1) to rotate during the detection process, it is required that the ends of the other ends of the two elastic clips (22) are not on the same straight line as the line between the top pressure point of the lens (3) to be detected and the center of the lens (3) to be detected. Preferably, the supporting window sheet (21) is a transparent light-transmitting part or a hollow part at least at the part directly below the lens (3) to be detected, so as to avoid eccentric detection deviation caused by refraction of the test light.

[0030] Figure 4 The present invention is a schematic diagram of a lens eccentricity detection method, comprising the following steps:

[0031] Step 1, fix the lens (3) to be tested on the upper surface of the plane window (1) by gluing, wherein the lens (3) to be tested is a plano-concave lens or a plano-convex lens, and the aperture of the lens (3) to be tested is less than 2 mm; the plane window preferably adopts a circular window. The lens to be tested is fixed on the surface of the plane window by gluing in a manner that the plane is downward and the concave or convex surface is upward, and the gluing position is as close as possible to the center of the plane window. In order to ensure that the light source of the eccentricity tester can observe the imaging of the plano-convex / plano-concave lens through the plane window, K9 material glass can be selected as the material for making the plane window.

[0032] Step 2, placing the plane window sheet (1) with the lens (3) to be inspected bonded thereto upwards between the bearing window sheet (21) and the elastic clip (22) of the fixture (2), and fixing it by utilizing the elastic force of the elastic clip (22), while making the other end of the elastic clip (22) press against different parts of the outer circumferential wall of the lens (3) to be inspected;

[0033] Step 3, fix the bearing window (21) of the fixture (2) on the eccentric fixture (5) of the eccentric detector (4), and adjust the position of the eccentric fixture (5) of the eccentric detector (4) so ​​that the laser light source of the eccentric detector (4) is located above the lens (3) to be detected, and the detection laser beam emitted by the laser light source of the eccentric detector (4) just vertically passes through the center point of the lens (3) to be detected, and is imaged on the imaging system located below the lens (3) to be detected;

[0034] Step 4, use your fingers to hold the plane window (1), and at the same time apply a certain force to push the plane window (1) to drive the lens to be tested (3) to rotate at least 360 degrees around the center of the lens to be tested (3), and during the rotation process, the other ends of the two elastic clips (22) are respectively kept in contact with the outer peripheral wall of the lens to be tested (3), and the eccentricity value of the lens to be tested (3) is obtained according to whether the imaging position of the detection laser beam displayed by the imaging system of the eccentricity detector (4) during the rotation process is eccentric and the eccentricity position. Since the rotation of the plane window drives the lens to be tested to rotate, and at the same time the outer diameter of the lens to be tested is against two points of the two clips, that is, the outer diameter positioning method ensures that the lens to be tested will not be offset during the rotation process. When the product without eccentricity rotates, the center of the light beam on the eccentricity tester will not change. If there is eccentricity, the position of the center point of the light beam on the eccentricity tester will be offset. The eccentricity value of the lens to be tested can be obtained according to the display result of the eccentricity tester.

[0035] By adopting the technical solution of the present application, the small lens to be tested is glued to the plane window piece, and the small plane of the product to be tested is transformed into a large plane of the plane window piece. The structure is more stable, which is convenient for manual operation in the positioning and rotation test of the fixture, and the operation is more controllable, which can effectively improve the test efficiency. At the same time, by matching the bearing window piece of the fixture with the conventional fixture of the eccentricity tester, and positioning the outer diameter of the small lens to be tested by two clips, it is ensured that the small lens to be tested will not be offset during the test rotation process, which can improve the test accuracy of the eccentricity value of the small lens.

[0036] The above specific implementation modes are only detailed explanations of the technical solutions of the present invention. The present invention is not limited to the above embodiments. Any improvement or replacement based on the principles of the present invention should be within the protection scope of the present invention.

Claims

1. A method for detecting eccentricity of a small-aperture lens, characterized in that: The following steps are involved: Step 1, fixing the lens to be detected (3) on the upper surface of the plane window (1), wherein the lens to be detected (3) is a plano-concave lens or a plano-convex lens; Step 2, placing the plane window sheet (1) with the lens (3) to be inspected bonded thereto upwards between the supporting window sheet (21) and the elastic clip (22) of the fixture (2), and fixing it by utilizing the elastic force of the elastic clip (22), while making the other ends of the two elastic clips (22) press against different parts of the outer circumferential wall of the lens (3) to be inspected respectively; Step 3, fix the bearing window (21) of the fixture (2) on the eccentric fixture (5) of the eccentric detector (4), and adjust the position of the eccentric fixture (5) of the eccentric detector (4) so ​​that the laser light source of the eccentric detector (4) is located above the lens (3) to be detected, and the detection laser beam emitted by the laser light source of the eccentric detector (4) just vertically passes through the center point of the lens (3) to be detected, and is imaged on the imaging system located below the lens (3) to be detected; Step 4: Push the flat window sheet to drive the lens to be detected (3) to rotate at least 360 degrees around the center of the lens to be detected (3), and during the rotation, the other ends of the two elastic clips (22) are respectively kept in contact with the outer peripheral wall of the lens to be detected (3), and the eccentricity value of the lens to be detected (3) is obtained according to whether the imaging position of the detection laser beam displayed by the imaging system of the eccentricity detector (4) during the rotation is eccentric and the eccentricity position.

2. A device for detecting eccentricity of a small-diameter lens, applied to the method for detecting eccentricity of a small-diameter lens as claimed in claim 1, characterized in that: It comprises a plane window sheet (1) for fixing and mounting a lens (3) to be detected, and a fixture (2) for fixing the plane window sheet (1) to an eccentric fixture of an eccentric detector and positioning the rotation of the lens (3) to be detected; The plane window (1) is a flat transparent material, and its upper surface is used for fixing and mounting the lens (3) to be inspected; The clamp (2) has a bottom portion for a bearing window (21) for fixedly mounting and cooperating with an eccentric clamp of an eccentric detector. The bearing window (21) is provided with two elastic clips (22). One end of each elastic clip (22) is fixedly connected to the bearing window (21), and the other end of each elastic clip (22) can be movably pressed on the top of the plane window (1) so as to fix and clamp the plane window (1) between the bearing window (21) and the elastic clip (22). The other ends of the two elastic clips (22) are The ends of the two elastic clips (22) are respectively pressed against different parts of the outer circumferential wall of the lens to be detected (3) fixedly mounted above the plane window sheet (1) to position the rotation of the lens to be detected (3) during detection, and the connecting line between the pressing point of the lens to be detected (3) and the center of the lens to be detected (3) at the other ends of the two elastic clips (22) is not on a straight line; the bearing window sheet (21) is a transparent light-transmitting part or a hollow part at least at the part directly below the lens to be detected (3).

3. The lens eccentricity detection device as claimed in claim 2, characterized in that The lens to be inspected (3) is fixedly mounted on the upper surface of the plane window sheet (1) by means of a glue-like substance.

4. The lens eccentricity detection device according to claim 2, characterized in that: The material of the plane window (1) and the bearing window (21) is K9 material glass.

5. The lens eccentricity detection device as claimed in claim 2, characterized in that , the lens to be tested is a plano-concave lens or a plano-convex lens, and the aperture of the lens to be tested is less than 2 mm.

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