Lens surface bending and thickness measuring device and application method thereof

Abstract

The invention provides a lens surface bending and thickness measuring device and a use method thereof, the lens surface bending and thickness measuring device comprises a bottom plate, the bottom plate is provided with a bottom support used for placing a lens, the bottom plate is provided with three liftable sensors, the three sensors are arranged in a matched manner, the three sensors correspond to the bottom support in position, and the bottom support is arranged on the bottom plate. After the lens is placed on the bottom support, the three sensors can move towards the lens. During use, the three driving motors of the lifting assembly are started, the three sensors move downwards until the three sensors make contact with the surface of the lens, then the moving distance of each sensor is recorded, the surface bending radius and the center thickness are calculated according to the distance difference, thickness measurement can be conducted at multiple points during detection, surface bending information is rapidly obtained, and a detection result is rapidly output in cooperation with a PLC. Therefore, the device has the advantages of being simple in structure, low in cost, rapid in measurement, high in precision, easy and convenient to operate, high in adaptability and the like.

Description

Technical Field

[0001] This invention belongs to the field of optical component testing technology, and specifically relates to a lens surface curvature and thickness measuring device and its usage method. Background Technology

[0002] Currently, most lens inspection methods use optical interference or contour scanning, which involve complex equipment and high costs.

[0003] While contact measurement methods are simple, they are mostly limited to single-point thickness measurement and cannot simultaneously acquire surface curvature information. Therefore, there is a need for a device that is simple in structure, low in cost, and can simultaneously measure surface curvature and thickness.

[0004] Therefore, in view of the shortcomings of the above-mentioned solutions in actual manufacturing and implementation, a lens surface curvature and thickness measuring device and its usage method are provided to solve the above-mentioned technical problems. Summary of the Invention

[0005] This invention proposes a lens surface curvature and thickness measuring device and its usage method, which solves the problems in the prior art.

[0006] The technical solution of the present invention is implemented as follows: a lens surface curvature and thickness measuring device includes a base plate, on which a base support for placing a lens is installed, and three liftable sensors are installed on the base plate. The three sensors are arranged in cooperation and correspond to the position of the base support. After the lens is placed on the base support, the three sensors can move toward the lens.

[0007] In a preferred embodiment, three lifting components are mounted on the base plate, and the three sensors are respectively mounted on the three lifting components.

[0008] In a preferred embodiment, the lifting assembly includes a vertically arranged vertical plate, a slider slidably mounted on the vertical plate, a sensor mounted on the side of the slider, and a driving mechanism for driving the slider to move up and down the vertical plate is provided at the top of the vertical plate.

[0009] In a preferred embodiment, the driving mechanism includes a drive motor fixedly mounted on the top of the vertical plate, the drive motor having a drive shaft driven on it, the drive shaft being connected to the slider, and the rotation of the drive shaft causing the slider to move along the vertical plate.

[0010] As a preferred embodiment, the lens surface curvature and thickness measuring device according to claim 1 is characterized in that a PLC controller is installed on the base plate, three drive motors are provided, and the PLC controller is electrically connected to the three drive motors.

[0011] In a preferred embodiment, a clamping cylinder is installed on the base plate. The clamping cylinder is positioned to cooperate with the base support, and the lens is clamped by the clamping cylinder after being placed on the base support.

[0012] A method for measuring a lens using the lens curvature and thickness measuring device described above includes the following steps: S1. Calibrate the three sensors to place them on the same reference plane; S2. Place the lens on the base and secure it; S3. Start the three drive motors of the lifting assembly to make the three sensors move downward until they contact the lens surface; S4. Record the movement distance of each sensor; S5. Calculate the surface bend radius and center thickness based on the distance difference.

[0013] In a preferred embodiment, the three sensors are sensor A, sensor B, and sensor C. In use, sensor A is aligned with the center of the lens, sensor B is L1 away from A, sensor C is L2 away from A, and the directions AB and AC are perpendicular to each other.

[0014] In a preferred embodiment, three drive motors are provided: drive motor D, drive motor E, and drive motor F. Drive motors D, E, and F are respectively configured to work with sensors A, B, and C. In use, drive motor D drives sensor A downward, drive motor E drives sensor B downward, and drive motor F drives sensor C downward. At the instant sensors A, B, and C contact the lens, drive motors D, E, and F feed back the number of pulses they have traveled to the PLC controller. The PLC controller calculates the distances traveled by the three points (sensor A, B, and C) based on the number of pulses fed back by the motors. The vertical distance between sensor B and sensor A is T1, and the vertical distance between sensor C and sensor A is T2.

[0015] In a preferred embodiment, the PLC controller calculates the radius of curvature R1 in the AB direction and the radius of curvature R2 in the AC direction according to the following formula: R1=(T1 2 +L1 2 ) / 2T1; R2=(T2 2 +L2 2 ) / 2T2.

[0016] After adopting the above technical solution, the beneficial effects of the present invention are as follows: The lens surface curvature and center thickness measuring device and method provided by the present invention have the advantages of simple structure, low cost, fast measurement, high accuracy, easy operation, and strong adaptability. During the inspection, the thickness can be measured at multiple points, and surface curvature information can be quickly obtained at the same time. The test results can be quickly output in conjunction with the PLC controller. It is especially suitable for online automated inspection in the lens production process, and has significant technical advantages and practical value in improving inspection efficiency, reducing equipment costs, and ensuring product quality. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a partial structural diagram of the present invention; Figure 3 This is a schematic diagram of the overall structure of the present invention; Figure 4 This is a schematic diagram showing the positional coordination between the sensor and the lens during the use of this invention; Figure 5 This is a schematic diagram showing the positional coordination between the sensor and the lens during the use of this invention; Figure 6 This is a schematic diagram showing the positional coordination between the sensor and the lens when using this invention.

[0019] In the diagram, 1. Base plate; 2. Turntable; 3. Clamping cylinder; 301. Clamping arm; 302. Clamping column; 4. Measuring mechanism; 41. First lifting assembly; 4101. Connecting frame; 4102. Vertical plate; 4103. Sensing plate; 4104. Induction switch; 4105. Slider; 4106. Drive motor; 4107. Sensor; 4108. Drive shaft; 4109. Connecting plate; 4110. Top plate; 42. Second lifting assembly; 43. Third lifting assembly; 5. Base support. Detailed Implementation

[0020] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0021] like Figures 1 to 3 As shown, a lens surface curvature and thickness measuring device includes a base plate 1, a turntable 2 rotatably mounted on the base plate 1, a base support 5 for placing a lens mounted on the turntable 2, and a clamping cylinder 3 mounted on the turntable 2. The clamping cylinder 3 includes a clamping arm 301, and a clamping column 302 mounted on the clamping arm 301. The clamping cylinder 3 is positioned corresponding to the base support 5. When the lens is placed on the base support 5 for measurement, it is clamped and fixed by the clamping column 302 of the clamping cylinder 3. Three connecting frames 4101 are vertically mounted on the base plate 1, and three liftable sensors 4107 are mounted on the three connecting frames 4101. The three sensors 4107 are configured in a coordinated manner, and their positions correspond to the base support 5. After the lens is placed on the base support 5, the three sensors 4107 can move towards the lens.

[0022] Specifically, a connecting plate 4109 is mounted on the side of the slider 4105, and a sensor 4107 is mounted on the connecting plate 4109. A sensing plate 4103 is mounted on the side of the slider 4105, and a sensing switch 4104 is mounted on the side of the vertical plate 4102. The sensing plate 4103 and the sensing switch 4104 are configured in conjunction.

[0023] A measuring mechanism 4 is mounted on the base plate 1. The measuring mechanism 4 includes three lifting components, which have the same structure. Three sensors 4107 are respectively mounted on the three lifting components. The lifting components are the first lifting component 41, the second lifting component 42, and the third lifting component 43.

[0024] The first lifting assembly 41 includes a vertically arranged vertical plate 4102, a slider 4105 slidably mounted on the vertical plate 4102, a sensor 4107 mounted on the side of the slider 4105, and a drive mechanism for driving the slider 4105 to move up and down the vertical plate 4102 is provided at the top of the vertical plate 4102. Three drive mechanisms are provided.

[0025] The driving mechanism includes a drive motor 4106 fixedly installed on the top of the vertical plate 4102. The drive motor 4106 is driven by a drive shaft 4108. The drive shaft 4108 is connected to the slider 4105. The rotation of the drive shaft 4108 drives the slider 4105 to move along the vertical plate 4102.

[0026] Specifically, a top plate 4110 is provided at the top of the vertical plate 4102, and the drive motor 4106 is fixedly installed on the top plate 4110. The drive shaft 4108 can be a threaded shaft, and the thread of the threaded shaft passes through the slider 4105. The drive shaft 4108 can also be a lead screw, and a lead screw nut is installed inside the slider 4105. The lead screw nut is installed on the lead screw, which can also drive the slider 4105 to move up and down.

[0027] A PLC controller is installed on the base plate 1, and three drive motors 4106 are provided. The PLC controller is electrically connected to the three drive motors 4106.

[0028] A clamping cylinder 3 is installed on the base plate 1. The clamping cylinder 3 is positioned to match the base support 5. After the lens is placed on the base support 5, it is clamped by the clamping cylinder 3.

[0029] like Figures 4 to 6 As shown, a method for measuring a lens using the above-described lens curvature and thickness measuring device includes the following steps: S1. Calibrate the three sensors 4107 to place them on the same reference plane; S2. Place the lens on the base 5 and secure it. S3. Start the three drive motors 4106 of the lifting assembly to make the three sensors 4107 move downward until they contact the lens surface; S4. Record the moving distance of each sensor 4107; S5. Calculate the surface bend radius and center thickness based on the distance difference.

[0030] The three sensors 4107 are sensor A, sensor B and sensor C. When in use, sensor A is aligned with the center of the lens, sensor B is L1 away from A, sensor C is L2 away from A, and the directions AB and AC are perpendicular to each other.

[0031] There are three drive motors 4106: drive motor D, drive motor E, and drive motor F. Drive motors D, E, and F are respectively configured to work with sensors A, B, and C, as follows: Figure 1 As shown, drive motor D is located in the middle, and drive motor E and drive motor F are symmetrically arranged on both sides of drive motor D; In use, drive motor D moves sensor A downwards, drive motor E moves sensor B downwards, and drive motor F moves sensor C downwards. The instant that sensors A, B, and C contact the lens, drive motors D, E, and F feed back the number of pulses they have traveled to the PLC controller. The PLC controller calculates the distances traveled by the three points (sensor A, sensor B, and sensor C) based on the number of pulses fed back by the motors. The vertical distance between sensor B and sensor A is T1, and the vertical distance between sensor C and sensor A is T2.

[0032] The PLC controller is based on the Pythagorean theorem L1. 2 +(R1-T1) 2 =R1 2 Calculate the radius of curvature R1 in the AB direction: R1=(T1 2 +L12 ) / 2T1; Similarly, the radius of curvature R2 in the AC direction can be calculated: R2=(T2 2 +L2 2 ) / 2T2.

[0033] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A lens surface curvature and thickness measuring device, comprising a base plate (1), wherein a base holder (5) for placing a lens is mounted on the base plate (1), characterized in that, Three liftable sensors (4107) are installed on the base plate (1). The three sensors (4107) are arranged in a coordinated manner and correspond to the position of the base (5). After the lens is placed on the base (5), the three sensors (4107) can move toward the lens.

2. The lens surface curvature and thickness measuring device according to claim 1, characterized in that, Three lifting components are installed on the base plate (1). The three lifting components are the first lifting component, the second lifting component and the third lifting component. The three sensors (4107) are respectively installed on the three lifting components.

3. The lens surface curvature and thickness measuring device according to claim 2, characterized in that, The first lifting assembly includes a vertically arranged vertical plate (4102), a slider (4105) is slidably mounted on the vertical plate (4102), a sensor (4107) is mounted on the side of the slider (4105), and a driving mechanism is provided on the top of the vertical plate (4102) to drive the slider (4105) to move up and down the vertical plate (4102).

4. The lens surface curvature and thickness measuring device according to claim 3, characterized in that, The driving mechanism includes a drive motor (4106) fixedly installed on the top of the vertical plate (4102). The drive motor (4106) is driven by a drive shaft (4108). The drive shaft (4108) is connected to the slider (4105). The rotation of the drive shaft (4108) drives the slider (4105) to move in the eye of the vertical plate (4102).

5. The lens surface curvature and thickness measuring device according to claim 4, characterized in that, According to claim 1, a lens surface curvature and thickness measuring device is characterized in that a PLC controller is installed on the base plate (1), and three drive motors (4106) are provided, and the PLC controller is electrically connected to the three drive motors (4106).

6. The lens surface curvature and thickness measuring device according to claim 1, characterized in that, A clamping cylinder (3) is installed on the base plate (1). The clamping cylinder (3) is positioned to cooperate with the base support (5). After the lens is placed on the base support (5), it is clamped by the clamping cylinder (3).

7. A method of using a lens surface curvature and thickness measuring device, characterized in that, The lens surface curvature and thickness measuring device as described in any one of claims 1 to 6 includes the following steps: S1. Calibrate the three sensors (4107) to place them on the same reference plane; S2. Place the lens on the base and secure it; S3. Start the three drive motors (4106) of the lifting assembly to make the three sensors (4107) move downward until they contact the surface of the lens; S4. Record the movement distance of each sensor (4107); S5. Calculate the surface bend radius and center thickness based on the distance difference.

8. The method of using the lens surface curvature and thickness measuring device according to claim 7, characterized in that, The three sensors (4107) are sensor A, sensor B and sensor C respectively. When in use, sensor A is aligned with the center of the lens, sensor B is L1 away from A, sensor C is L2 away from A, and the directions AB and AC are perpendicular to each other.

9. The method of using the lens surface curvature and thickness measuring device according to claim 7, characterized in that, Three drive motors (4106) are provided, namely drive motor D, drive motor E and drive motor F. Drive motors D, E and F are respectively configured to cooperate with sensor A, sensor B and sensor C. In use, drive motor D drives sensor A to move downward, drive motor E drives sensor B to move downward, and drive motor F drives sensor C to move downward. At the moment when sensor A, sensor B and sensor C come into contact with the lens, drive motors D, E and F feed back the number of pulses traveled to the PLC controller. The PLC controller calculates the distance traveled by the three points of sensor A, sensor B and sensor C based on the number of pulses fed back by the motor. Among them, the vertical distance between sensor B and sensor A is T1, and the vertical distance between sensor C and sensor A is T2.

10. The method of using the lens surface curvature and thickness measuring device according to claim 9, characterized in that, The PLC controller calculates the radius of curvature R1 in the AB direction and the radius of curvature R2 in the AC direction according to the following formula: R1=(T1 2 +L1 2 ) / 2T1; R2=(T2 2 +L2 2 ) / 2T2。

Images