A lens detection device and its detection method

Abstract

The present invention discloses a lens detection device and a detection method thereof, relating to the technical field of lenses. The device includes a fixture conveyor line, a transfer fixture, a surface detection mechanism, and a control unit; the lens is placed on the transfer fixture and moves in a straight line direction through the fixture conveyor line; the robotic arm of the surface detection mechanism drives the measuring fixture to clamp, move, and measure the lens; the rotation unit of the measuring fixture locks the bottom surface of the lens and rotates, and the contact ball of the contact measuring rod contacts the top surface of the lens and conducts the pressure to the ceramic capacitor. The control unit makes the contact measuring rod move back and forth between the center and the outer circular edge of the lens along a predetermined path according to the standard top surface shape of the lens. The control unit calculates the vertical displacement of the contact ball based on the measured pressure value, thereby fitting the real-time surface shape of the lens. By comparing with the standard surface shape data of the lens, unqualified lenses are screened out to achieve automatic detection and sorting; the problems of low measurement accuracy and efficiency in measuring the flatness of the lens are solved.

Description

Technical Field

[0001] The present invention relates to the technical field of lenses, and particularly to a lens detection device and a detection method thereof. Background Art

[0002] In the production process of stage light lenses, quartz glass is widely used due to its excellent optical properties and high temperature resistance. The primary light transmittance of quartz glass lenses is high, which can meet the requirements of high-power light sources for stage lights. However, the processability and mechanical properties of quartz glass are lower compared to PMMA or PC materials. In particular, its fragile nature poses challenges to the production of quartz glass lenses.

[0003] Among them, the production process of quartz glass lenses includes rough machining processes such as melting and forming, cutting, grinding and polishing. After rough machining, it can enter subsequent fine machining processes, such as the coating process.

[0004] Since the surface of quartz glass itself has uneven patterns during the melting and forming process, and if the pattern fluctuations are too large, it is easy to cause excessive stress on the lens surface by the grinding tool during polishing and grinding, resulting in the lens being prone to cracking or directly breaking. This makes the processing cost of quartz glass lenses very high and the yield rate relatively low.

[0005] After the cutting process of quartz glass, individual lenses are formed. Before entering the grinding and polishing process, since it is rough machining and the coating has not been carried out, a contact thickness measurement method is usually used, such as mechanical thickness measurement, to perform multi-point thickness measurement on the surface of the lens. By comparing the thicknesses of multiple measured points with the tolerance dimensions specified in the processing drawing, lenses with uniform thickness, small surface fluctuations, and uniform flatness, that is, lenses whose flatness meets the tolerance range specified in the processing drawing, can enter the grinding and polishing process.

[0006] However, the measuring instruments used in traditional mechanical thickness measurement methods are calipers, dial indicators, micrometers, etc. These measuring tools have some limitations in use. For example, it is easy to misalign the vertex position of the lens, misalign the axis position, or the pressure of the measuring head on the part is different, which may lead to large errors in the measurement results, and their measurement accuracy is usually lower than 10 micrometers.

[0007] Therefore, it is necessary to design a lens flatness (i.e., multi-point thickness) measurement device that can automatically find the axis or vertex position of the lens, and can provide balanced pressure on the two surfaces and multiple points of the lens during the measurement process, and has higher measurement accuracy than a micrometer, and can also improve the detection efficiency of the lens in an automated manner.

[0008] In summary, it is found that the prior art has at least the following technical problems:

[0009] In the processing and screening process of existing stage lenses, there are problems of low measurement accuracy and efficiency in measuring the flatness of the lenses. Summary of the Invention

[0010] The purpose of the present invention is to provide a lens detection device and its detection method to solve the problems of low measurement accuracy and efficiency in measuring the flatness of existing stage lenses during the processing and screening process.

[0011] The many technical effects that can be produced by the preferred technical solutions among the many technical solutions provided by the present invention are described in detail below.

[0012] To solve the above technical problems, the present invention provides the following technical solutions:

[0013] The present invention provides a lens detection device, including a jig conveyor line, a transfer jig supported by a single cantilever, a surface detection mechanism adapted to the shape of the lens, and a control unit; a single lens is placed on the top surface of the single transfer jig, and the transfer jig is placed on the jig conveyor line for carrying the lens to move linearly along the conveying direction; the surface detection mechanism includes a robotic arm arranged on one side of the jig conveyor line and equipped with a measuring fixture, and the robotic arm is used to drive the measuring fixture to clamp, move, and measure the lens placed on the transfer jig; the measuring fixture includes a rotating unit and a measuring unit arranged oppositely, the rotating unit bears and locks the bottom surface of the lens, and the measuring unit includes a contact measuring rod that can be laterally moved and lifted; the contact measuring rod includes a ceramic capacitor and a contact ball, and the contact ball contacts the top surface of the lens and conducts the force to the reaction diaphragm of the ceramic capacitor; the control unit is electrically connected to the jig conveyor line and the surface detection mechanism respectively;

[0014] Detection step: The control unit stores the standard top surface shape data of the lens to be detected. After the control unit controls the robotic arm to clamp the lens, it controls the rotating unit to drive the lens to rotate, and controls the contact measuring rod to move along the radial direction of the lens according to the top surface shape of the lens to be detected. By recording the pressure change of the ceramic capacitor and calculating and outputting the vertical displacement of the contact ball during the movement, the real-time surface shape data of the lens to be detected is fitted according to the continuously output displacement values;

[0015] Comparison step: The control unit compares the standard top surface shape data of the lens with the real-time surface shape data. If the real-time surface shape data is greater than the upper limit of the standard top surface shape data or the real-time surface shape data is less than the lower limit of the standard top surface shape data, it controls the robotic arm to place the clamped lens in the repair area. If the real-time surface shape data is within the upper and lower limit ranges of the standard top surface shape data, it controls the robotic arm to place the clamped lens on the top surface of the original transfer jig.

[0016] In one embodiment, the contact measurement rod further includes a base housing, a conduction rod, and a control circuit board; the control circuit board and the contact ball are respectively installed at both ends of the base housing; the ceramic capacitor is installed under the control circuit board, the ceramic capacitor is electrically connected to the control circuit board, and the control circuit board is electrically connected to the control unit; the conduction rod is slidably installed in the base housing, and both ends of the conduction rod are respectively in contact connection with the reaction diaphragm of the ceramic capacitor and the contact ball; when the contact ball is squeezed by the texture fluctuation on the surface of the lens during the movement, the contact ball will generate a vertical jump, and the force will be transmitted to the reaction diaphragm through the conduction rod. The ceramic capacitor changes its capacitance under the deformation of the reaction diaphragm, converts the capacitance change amount into an electrical signal through the control circuit board, and conducts it to the control unit. The control unit calculates the vertical displacement of the contact ball according to the electrical signal data transmitted by the control circuit board.

[0017] In one embodiment, when clamping the lens, the rotation unit is arranged on the bottom surface of the lens, and the measurement unit is arranged on the top surface of the lens. The measurement unit further includes a vertical drive group and a horizontal drive group; the rotation unit is used to adsorb the bottom of the lens and drive the lens to rotate, and the contact measurement rod contacts the top surface of the lens and moves along the radial direction under the drive of the horizontal drive group and the vertical drive group.

[0018] In one embodiment, the horizontal drive group and the vertical drive group drive the contact measurement rod to move from the center of the lens to the outer edge and from the outer edge of the lens to the center; when detecting a single lens, the controller needs to control the contact measurement rod to measure the path from the center to the outer edge of the lens back and forth, and fit the real-time surface shapes in the two directions back and forth. By continuously comparing the real-time surface shape data in the two directions of the lens with the standard top surface shape data twice, if the real-time surface shape data in both comparisons are within the upper and lower limits of the standard top surface shape data, then control the robotic arm to place the clamped lens on the top surface of the original transfer jig, and the jig transfer line will transfer the qualified lens to the next station.

[0019] In one embodiment, the lateral driving group includes a first slide rail, a first slider, a mounting block, a lateral driving motor, a gear disc and a rack; the first slider is slidably mounted on the first slide rail, the mounting block is mounted on the first slider, and the contact measuring rod and the rack are respectively arranged on both sides of the mounting block; the lateral driving motor is suspended and mounted on the mounting block, the main shaft of the lateral driving motor passes through the mounting block and is in transmission connection with the gear disc, and the gear disc is in meshing transmission with the rack; the lateral driving motor is electrically connected to the control unit, the contact measuring rod is connected to the mounting block through the vertical driving group, and the lateral driving motor drives the mounting block to drive the contact measuring rod to move laterally.

[0020] In one embodiment, the vertical driving group includes a second micro guide rail, a second micro slider, a connecting block, a transmission sleeve with external threads and a vertical driving motor; the second micro guide rail is mounted on the side surface of the mounting block, the second micro slider is slidably mounted on the second micro guide rail, both ends of the connecting block are respectively connected to the second micro slider and the contact measuring rod, and the transmission sleeve is sleeved on the contact measuring rod; the vertical driving motor is mounted on the top surface of the mounting block, the main shaft of the vertical driving motor passes through the mounting block and is in threaded transmission connection with the transmission sleeve; the vertical driving motor is electrically connected to the control unit, and the vertical driving motor drives the contact measuring rod to move up and down.

[0021] In one embodiment, the rotating unit includes a vacuum chuck, a rotating motor and a negative pressure machine, and both the rotating motor and the negative pressure machine are electrically connected to the control unit; the rotating motor is in transmission connection with the back surface of the vacuum chuck through a transmission shaft, the vacuum chuck is connected to the negative pressure machine through an air pipe, and the front surface of the vacuum chuck is an adsorption surface for adsorbing and carrying the bottom surface of the lens.

[0022] In one embodiment, a first sensor for detecting the position of the lens and a second sensor for detecting the position of the fixture are arranged at intervals in the conveying direction of the fixture conveying line; both the first sensor and the second sensor are electrically connected to the control unit.

[0023] In one embodiment, a notch is provided on one side of the top end surface of the conveying fixture for carrying the lens, and the notch is away from the cantilever of the conveying fixture.

[0024] A lens detection method is also provided. Both ends of the fixture conveying line are used to connect the feeding station and the discharging station, and the conveying direction of the fixture conveying line is from the feeding station to the discharging station; a repair area is provided on one side of the surface detection mechanism.

[0025] It includes the following steps. S1: The feeding station places the lens to be detected on the top surface of the transfer jig.

[0026] S2: The feeding station turns the notch-facing surface of the transfer jig towards the surface detection mechanism, places the transfer jig and the lens on the conveyor line of the feeding station, and the conveyor line of the feeding station conveys the transfer jig and the lens to the jig conveyor line.

[0027] S3: The transfer jig and the lens enter the jig conveyor line and flow to the first sensor. The first sensor detects whether there is a lens placed on the transfer jig; the first sensor transmits the detection signal to the control unit.

[0028] S4: The transfer jig and the lens flow from the first sensor to the second sensor. The second sensor detects whether the jig is in place; the second sensor transmits the detection signal to the control unit.

[0029] S5: In-place detection.

[0030] S5.1: When the first sensor detects that there is a lens on the transfer jig and the flow reaches the second sensor which detects that the transfer jig is in place, the control unit controls the jig conveyor line to stop, stops the transfer jig with the lens at the position of the second sensor; the control unit controls the surface detection mechanism to clamp the lens and detect the top surface shape data of the lens.

[0031] S5.11: The surface detection mechanism controls the robotic arm to drive the measuring fixture to extend towards the notch of the transfer jig. At the same time, the measuring unit in the measuring fixture rises, leaving a gap greater than the thickness of the lens to be accommodated between the measuring unit and the rotating unit.

[0032] S5.12: The measuring fixture extends into the lens with the gap between the measuring unit and the rotating unit, so that the measuring unit and the rotating unit are respectively on both sides of the center of the lens.

[0033] S5.13: The measuring unit lowers the contact measuring rod, making the contact ball contact the top surface of the lens. The capacitance of the ceramic capacitor changes under the action of the force of the contact ball. The contact measuring rod feeds back the detected pressure signal to the control unit. After receiving the signal, the control unit controls the robotic arm to lift, so that the rotating unit bears and locks the bottom surface of the lens, completing the clamping of the lens; the robotic arm lifts the lens upward and removes it from the transfer jig.

[0034] S5.14: The control unit issues an instruction to detect the top surface shape of the lens. The rotating unit starts to rotate, and the measuring unit drives the contact measuring rod to move back and forth from the center of the lens to the outer circle edge according to the moving path of the standard top surface shape of the lens; during the movement of the top surface of the lens, the pressure change data detected by the contact measuring rod is stored in the control unit.

[0035] S5.15: The control unit retrieves the stored pressure change data to the calculation module, converts the pressure change data into the vertical jump value of the deformation of the reaction diaphragm of the ceramic capacitor, and fits and plots the real-time shape curve of the lens top surface according to the path of the contact measuring rod movement, so as to generate the real-time surface shape data of the lens;

[0036] S5.16: The control unit fits the real-time surface shapes of the two directions in which the contact measuring rod travels back and forth on the lens top surface, and makes two consecutive comparisons between the real-time surface shape data of the two directions and the standard top surface shape data;

[0037] S5.17: If the real-time surface shape data of both comparisons are within the upper and lower limits of the standard top surface shape data, the top surface shape of the lens meets the flatness of the production standard; the control unit controls the robotic arm to place the clamped lens on the top surface of the original transfer jig, and the jig transfer line transfers the qualified lens to the blanking station;

[0038] S5.18: If the real-time surface shape data of both comparisons are not within the upper and lower limits of the standard top surface shape data, or if a single comparison is not within the upper and lower limits of the standard top surface shape data, the top surface shape of the lens does not meet the flatness of the production standard; the control unit controls the robotic arm to place the clamped lens in the repair area, and the jig transfer line sends the empty transfer jig to the blanking station;

[0039] S5.2: When the first sensor detects that there is no lens on the transfer jig and the second sensor detects that the transfer jig is in place, the control unit controls the jig transfer line to continue flowing, and sends the transfer jig without a lens to the blanking station; the surface detection mechanism has no clamping and detection actions; the control unit prompts the blanking station to recycle the transfer jig.

[0040] The beneficial effects of the present invention are as follows:

[0041] The lens detection device of the present invention, by adopting a surface detection mechanism that adapts to the lens shape, stores the top surface shapes of lenses with different shapes in the control unit, and the control unit controls the measuring unit to adaptively adjust the contact measuring rod according to the shapes of different lenses, thereby effectively improving the detection versatility and accuracy of the lens detection device.

[0042] Secondly, the combination of the rotation unit and the measuring unit in the device enables the lens to be detected omnidirectionally during rotation. Since the lens is circular, the circular motion provided by the rotation unit to the lens, combined with the linear movement of the contact measuring rod controlled by the measuring unit in the radial direction of the lens radius, obtains the omnidirectional surface jump data of the lens top surface, and generates the three-dimensional shape of the lens top surface through calculation, so as to obtain accurate top surface shape data.

[0043] Third, the contact measuring rod controlled by the measuring unit adopts a ceramic capacitor as the design of the pressure sensor and the contact ball. By sensing the pressure change, the accuracy of contact detection can be improved to within 10 microns. The control unit records the pressure change value, converts the pressure change value into a vertical displacement value through conversion calculation, generates the three-dimensional shape of the lens top surface to realize the all-round detection of the lens, realizes the high-precision capture of the lens top surface shape, realizes the high-precision and comprehensive detection of the lens in a contact measurement manner, thereby improving the stability and accuracy of the automatic equipment for detecting the lens surface runout.

[0044] In addition, by comparing the detected real-time surface shape data of the lens with the standard surface shape data through the control unit, the unqualified lenses can be automatically sorted to the repair area by the robotic arm and the measuring fixture, and the qualified lenses are placed on the top surface of the original transfer fixture by the robotic arm and the measuring fixture. Thus, the contact automatic detection of the lens is realized, greatly reducing the errors and inefficiencies of manual measurement, improving the detection accuracy and efficiency of the lens production line, preparing for screening lenses before entering the grinding and polishing process, and reducing the cracking and breaking probability of the lens during grinding and polishing, thereby improving the yield rate of the grinding and polishing process. Brief Description of the Drawings

[0045] In order to more clearly illustrate the technical solutions of the present invention, the drawings required for the implementation manners will be briefly introduced below. Obviously, the drawings in the following description are only some implementation manners of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0046] Figure 1 It is a schematic side view structure diagram of the lens detection device of the present invention;

[0047] Figure 2 It is a schematic top view structure diagram of the fixture transfer line of the present invention;

[0048] Figure 3 It is an isometric structure diagram of the lens detection device of the present invention;

[0049] Figure 4 It is a partial structure diagram of the transfer fixture, the lens and the measuring fixture of the present invention;

[0050] Figure 5 It is a partially enlarged structure diagram of the measuring fixture of the present invention;

[0051] Figure 6 It is a partial isometric structure diagram of the measuring fixture of the present invention;

[0052] Figure 7 It is a schematic cross-sectional structure diagram of the contact measuring rod of the present invention.

[0053] Among them, the reference numerals are as follows:

[0054] 1. Fixture conveyor line; 11. First sensor; 12. Second sensor;

[0055] 2. Transfer fixture; 21. Notch; 22. Cantilever;

[0056] 3. Surface detection mechanism;

[0057] 4. Robot arm;

[0058] 5. Measuring fixture;

[0059] 6. Rotating unit; 61. Vacuum chuck; 62. Rotating motor; 63. Negative pressure machine;

[0060] 7. Measuring unit; 71. Contact measuring rod; 711. Ceramic capacitor; 712. Reaction diaphragm; 713. Base; 714. Contact ball; 715. Base shell; 716. Conducting rod; 717. Control circuit board; 72. Lateral drive group; 721. First slide rail; 722. First slider; 723. Mounting block; 724. Lateral drive motor; 725. Gear disk; 726. Rack; 73. Vertical drive group; 731. Second micro slide rail; 732. Second micro slider; 733. Connecting block; 734. Transmission screw sleeve; 735. Vertical drive motor;

[0061] 8. Lens. Detailed implementation manners

[0062] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention.

[0063] A lens detection device and its detection method are provided in the detailed implementation manners. The robot arm of the surface detection mechanism drives the measuring fixture to clamp, move and measure the lens; the rotating unit of the measuring fixture locks the bottom surface of the lens and rotates, the contact ball of the contact measuring rod contacts the top surface of the lens and conducts the pressure to the ceramic capacitor, and the control unit makes the contact measuring rod move back and forth between the center and the outer edge of the lens along a predetermined path according to the standard top surface shape of the lens. The control unit calculates the vertical displacement of the contact ball according to the measured pressure value, thereby fitting the real-time surface shape of the lens. By comparing with the standard surface shape data of the lens, unqualified lenses are screened out to achieve automatic detection and sorting; effectively solving the problem of low measurement accuracy and efficiency in measuring the flatness of the lens during the processing and screening process of the existing stage lens.

[0064] In addition, all the contents of the configurations shown in the following embodiments are not limited to those necessary for the solution of the invention described in the claims.

[0065] The first embodiment of the lens detection device is as followsFigures 1 to 7 As shown in the figure, it includes a jig conveyor line 1, a transfer jig 2 supported by a single cantilever 22, a surface detection mechanism 3 in the shape of an adaptive lens 8, and a control unit. A single lens 8 is placed on the top surface of a single transfer jig 2. The transfer jig 2 is placed on the jig conveyor line 1 and is used to carry the lens 8 to move linearly along the transfer direction. The surface detection mechanism 3 includes a robotic arm 4 arranged on one side of the jig conveyor line 1 and equipped with a measuring fixture 5. The robotic arm 4 is used to drive the measuring fixture 5 to clamp, move, and measure the lens 8 placed on the transfer jig 2. The measuring fixture 5 includes a rotating unit 6 and a measuring unit 7 arranged opposite to each other. The rotating unit 6 carries and locks the bottom surface of the lens 8. The measuring unit 7 includes a contact measuring rod 71 that can be horizontally translated and lifted. The contact measuring rod 71 includes a ceramic capacitor 711 and a contact ball 714. The contact ball 714 contacts the top surface of the lens 8 and conducts the force to the reaction diaphragm 712 of the ceramic capacitor 711.

[0066] The control unit is electrically connected to the jig conveyor line 1 and the surface detection mechanism 3 respectively.

[0067] Detection step: The control unit stores the standard top surface shape data of the lens 8 to be detected. After the control unit controls the robotic arm 4 to clamp the lens 8, it controls the rotating unit 6 to drive the lens 8 to rotate, and controls the contact measuring rod 71 to move along the radial direction of the lens 8 according to the top surface shape of the lens 8 to be detected. By recording the pressure change of the ceramic capacitor 711 and calculating and outputting the vertical displacement of the contact ball 714 during the movement, the real-time surface shape data of the lens 8 to be detected is fitted according to the continuously output displacement values.

[0068] Comparison step: The control unit compares the standard top surface shape data and the real-time surface shape data of the lens 8. If the real-time surface shape data is greater than the upper limit of the standard top surface shape data, or the real-time surface shape data is less than the lower limit of the standard top surface shape data, it controls the robotic arm 4 to place the clamped lens 8 in the repair area. If the real-time surface shape data is within the upper and lower limit ranges of the standard top surface shape data, it controls the robotic arm 4 to place the clamped lens 8 on the top surface of the original transfer jig 2.

[0069] For the lens 8 detection device of the present invention, by adopting the surface detection mechanism 3 in the shape of an adaptive lens 8, the top surface shapes of lenses 8 with different shapes are stored in the control unit, and the control unit controls the measuring unit 7 to adaptively adjust the contact measuring rod 71 according to the shapes of different lenses 8, thereby effectively improving the detection versatility and accuracy of the lens 8 detection device.

[0070] Secondly, the combination of the rotating unit 6 and the measuring unit 7 in the device enables the lens 8 to be comprehensively detected during rotation. Since the lens 8 is circular, the circular motion provided by the rotating unit 6 to the lens 8, combined with the linear movement of the contact measuring rod 71 controlled by the measuring unit 7 in the radial direction of the lens 8, obtains the comprehensive surface runout data of the top surface of the lens 8, and generates the three-dimensional shape of the top surface of the lens 8 by calculation, so as to obtain accurate top surface shape data.

[0071] Thirdly, the contact measuring rod 71 controlled by the measuring unit 7 adopts the design of using a ceramic capacitor 711 as a pressure sensor and a contact ball 714. Through sensitive pressure changes, the accuracy of contact detection can be improved to within 10 micrometers; the control unit records the pressure change value, converts the pressure change value into a vertical displacement value through conversion calculation, generates the three-dimensional shape of the top surface of the lens 8 to realize the comprehensive detection of the lens 8, realizes the high-precision capture of the top surface shape of the lens 8, realizes the high-precision and comprehensive detection of the lens 8 in a contact measurement manner, thereby improving the stability and accuracy of the automatic device for detecting the surface runout of the lens 8.

[0072] In addition, by comparing the detected real-time surface shape data of the lens 8 with the standard surface shape data through the control unit, the unqualified lens 8 can be automatically sorted to the repair area by the robotic arm 4 and the measuring fixture 5, and the qualified lens 8 is placed on the top surface of the original transfer jig 2 by the robotic arm 4 and the measuring fixture 5; thus, the contact automatic detection of the lens 8 is realized, greatly reducing the errors and inefficiencies of manual measurement, improving the detection accuracy and efficiency of the lens 8 production line, preparing for screening the lens 8 before entering the grinding and polishing process, and reducing the cracking and breaking probability of the lens 8 during grinding and polishing, thereby improving the yield of the grinding and polishing process.

[0073] As one of the optional implementation manners,

[0074] Regarding the specific structure of the above-mentioned transfer jig 2 cooperating with the robotic arm 4 and the measuring unit 7 to clamp and move the lens 8, in this embodiment, Figure 2 and Figure 3 as shown, a notch 21 is provided on one side of the top surface of the transfer jig 2 for carrying the lens 8, and the notch 21 is away from the cantilever 22 of the transfer jig 2.

[0075] Regarding the specific positions of the above-mentioned rotating unit 6 and measuring unit 7, and the specific structure of the measuring unit 7 driving the contact measuring rod 71 to move vertically and horizontally, in this embodiment, Figure 4As shown in the figure, when clamping the lens 8, the rotating unit 6 is arranged on the bottom surface of the lens 8, and the measuring unit 7 is arranged on the top surface of the lens 8. The measuring unit 7 further includes a vertical driving group 73 and a horizontal driving group 72; the rotating unit 6 is used to adsorb the bottom of the lens 8 and drive the lens 8 to rotate, and the contact measuring rod 71 contacts the top surface of the lens 8 and moves in the radial direction under the drive of the horizontal driving group 72 and the vertical driving group 73.

[0076] Furthermore, the horizontal driving group 72 and the vertical driving group 73 drive the contact measuring rod 71 to move from the center of the lens 8 to the outer edge and from the outer edge of the lens 8 to the center.

[0077] When detecting a single lens 8, the controller needs to control the contact measuring rod 71 to measure the path from the center of the lens 8 to the outer edge and back, and fit the real-time surface shapes in the two directions of the round trip. By continuously comparing the real-time surface shape data in the two directions of the lens 8 with the standard top surface shape data, if the real-time surface shape data of the two comparisons are both within the upper and lower limits of the standard top surface shape data, then control the robotic arm 4 to place the clamped lens 8 on the top surface of the original transfer jig 2, and the jig transfer line 1 transfers the qualified lens 8 to the next station.

[0078] Regarding the detailed sensing structure of the above contact measuring rod 71 and the specific method of calculating the vertical displacement of the contact ball 714 through pressure sensing, this embodiment is as follows Figure 7 As shown in the figure, the contact measuring rod 71 further includes a base shell 715, a conduction rod 716, and a control circuit board 717; the control circuit board 717 and the contact ball 714 are respectively installed at both ends of the base shell 715; a ceramic capacitor 711 is installed under the control circuit board 717, and the ceramic capacitor 711 is electrically connected to the control circuit board 717, and the control circuit board 717 is electrically connected to the control unit; the conduction rod 716 is slidably installed in the base shell 715, and both ends of the conduction rod 716 are abutted and connected to the reaction diaphragm 712 of the ceramic capacitor 711 and the contact ball 714 respectively; when the contact ball 714 is squeezed by the texture fluctuations on the surface of the lens 8 during the movement process, the contact ball 714 will generate a vertical jump, and the force will be transmitted to the reaction diaphragm 712 through the conduction rod 716. The ceramic capacitor 711 changes its capacitance under the deformation of the reaction diaphragm 712. The capacitance change amount is converted into an electrical signal through the control circuit board 717 and transmitted to the control unit. The control unit calculates the vertical displacement of the contact ball 714 according to the electrical signal data transmitted by the control circuit board 717.

[0079] When in use, the ceramic capacitor 711 and the control circuit board 717 (PCB and IC) forms a ceramic capacitor 711 pressure sensor, the contact ball 714 directly contacts the top surface of the lens 8 as a direct sensing element, and the conductive rod 716 acts as a medium for force conduction; the reaction diaphragm 712 of the ceramic capacitor 711 changes the electrode distance between the reaction diaphragm 712 and the base 713 of the ceramic capacitor 711 through deformation, thereby generating a change in capacitance; according to the model of the ceramic capacitor 711 used, the vertical deformation value of the reaction diaphragm 712 of the corresponding thickness at each pressure level is called out as the data source; the pressure value of the top surface of the lens 8 measured by the contact measuring rod 71 is compared with the data source to calculate the line height of the top surface of the lens 8 under the corresponding pressure; the lens 8 is rotated in combination with the rotating unit 6, and the contact measuring rod 71 is moved along the radial direction of the lens 8 at the same time, and a number of line heights are fitted to form the real-time surface shape data of the top surface of the lens 8, that is, the three-dimensional shape of the top surface of the lens 8, thereby obtaining the implemented top surface shape of the lens 8, and the qualified lens 8 and the lens 8 that needs to be repaired can be judged by comparing with the standard surface shape. Since the ceramic capacitor 711 pressure sensor is used as the sensing element for collecting the vibration of the lens 8 surface, the accuracy of contact detection can be improved to within 10 microns through the cooperation of the contact ball 714, and the lens 8 can be fully detected by generating the three-dimensional shape of the top surface of the lens 8, thereby realizing high-precision and comprehensive detection of the lens 8 by contact measurement.

[0080] Regarding the specific structure of the rotating unit 6, this embodiment Figure 4 As shown, the rotating unit 6 includes a vacuum suction cup 61, a rotating motor 62 and a negative pressure machine 63, and the rotating motor 62 and the negative pressure machine 63 are both electrically connected to the control unit; the rotating motor 62 is connected to the back side of the vacuum suction cup 61 through a transmission shaft, the vacuum suction cup 61 is connected to the negative pressure machine 63 through an air pipe, and the front side of the vacuum suction cup 61 is an adsorption surface for adsorbing and supporting the bottom surface of the lens 8.

[0081] Specifically, the specific structure of the lateral drive group 72 is as follows: Figures 4 to 6As shown in the figure, the lateral driving group 72 includes a first slide rail 721, a first slider 722, a mounting block 723, a lateral driving motor 724, a gear disc 725 and a rack 726; the first slider 722 is slidably mounted on the first slide rail 721, the mounting block 723 is mounted on the first slider 722, the contact measuring rod 71 and the rack 726 are respectively arranged on both sides of the mounting block 723; the lateral driving motor 724 is suspended and mounted on the mounting block 723, the main shaft of the lateral driving motor 724 passes through the mounting block 723 and is in transmission connection with the gear disc 725, and the gear disc 725 is in meshing transmission with the rack 726; the lateral driving motor 724 is electrically connected to the control unit, the contact measuring rod 71 is connected to the mounting block 723 through the vertical driving group 73, and the lateral driving motor 724 drives the mounting block 723 to drive the contact measuring rod 71 to move laterally.

[0082] Specifically, for the specific structure of the vertical driving group 73, in this embodiment, for example Figures 4 to 6 As shown in the figure, the vertical driving group 73 includes a second micro guide rail 731, a second micro slider 732, a connecting block 733, a transmission sleeve 734 with external threads and a vertical driving motor 735; the second micro guide rail 731 is mounted on the side surface of the mounting block 723, the second micro slider 732 is slidably mounted on the second micro guide rail 731, both ends of the connecting block 733 are respectively connected to the second micro slider 732 and the contact measuring rod 71, and the transmission sleeve 734 is sleeved on the contact measuring rod 71; the vertical driving motor 735 is mounted on the top surface of the mounting block 723, the main shaft of the vertical driving motor 735 passes through the mounting block 723 and is in threaded transmission connection with the transmission sleeve 734; the vertical driving motor 735 is electrically connected to the control unit, and the vertical driving motor 735 drives the contact measuring rod 71 to move up and down.

[0083] Regarding the sensing mechanism of the above-mentioned control fixture transfer line 1, in this embodiment, for example Figure 1 and Figure 2 As shown in the figure, in the transfer direction of the fixture transfer line 1, there are a first sensor 11 for detecting the position of the lens 8 and a second sensor 12 for detecting the position of the fixture, which are arranged at intervals; both the first sensor 11 and the second sensor 12 are electrically connected to the control unit.

[0084] During application, in order to avoid the second sensor 12 interfering with the actions of the measuring unit 7 and the robotic arm 4 when the measuring unit 7 clamps the lens 8, the setting and detection height of the first sensor 11 are equivalent to the height at which the lens 8 is placed; the setting and detection height of the second sensor 12 is lower than that of the first sensor 11.

[0085] More preferably, the setting and detection height of the second sensor 12 only need to be able to detect the transfer fixture 2. Specifically, the second sensor 12 can only detect the base of the transfer fixture 2, so as to minimize the height of the second sensor 12.

[0086] More specifically, both the first sensor 11 and the second sensor 12 are opposed sensors, and their transmitting parts and receiving parts are respectively arranged on both sides of the conveying direction of the jig conveying line 1.

[0087] The second embodiment of the lens detection device is as Figure 1 and Figure 3 shown. The difference between this embodiment and the first embodiment is that the first sensor 11 and the second sensor 12 adjacent to each other are taken as a group. In the case where a single robotic arm 4 performs detection, only one group needs to be set; when dealing with the expansion of the production capacity of the lens 8 and there are a large number of lenses 8 to be detected, as Figure 3 shown, multiple robotic arms 4 and measuring jigs 5 can be added. Correspondingly, for each additional group of robotic arms 4 and measuring jigs 5, one additional group of the first sensor 11 and the second sensor 12 needs to be added, so as to realize the linkage detection of the jig conveying line 1, multiple transfer jigs 2 and multiple groups of surface detection mechanisms 3, and improve the conveying efficiency of the jig conveying line 1.

[0088] Based on the above embodiments of the lens detection device, a lens detection method is provided. The two ends of the jig conveying line are used to connect the loading station and the unloading station, and the conveying direction of the jig conveying line is from the loading station to the unloading station; a repair area is provided on one side of the surface detection mechanism;

[0089] The method includes the following steps: S1: The loading station places the lens to be detected on the top surface of the transfer jig;

[0090] S2: The loading station turns the notch of the transfer jig towards the surface detection mechanism, places the transfer jig and the lens on the conveying line of the loading station, and the conveying line of the loading station conveys the transfer jig and the lens to the jig conveying line;

[0091] S3: The transfer jig and the lens enter the jig conveying line and flow to the first sensor. The first sensor detects whether there is a lens placed on the transfer jig; the first sensor transmits the detection signal to the control unit;

[0092] S4: The transfer jig and the lens flow from the first sensor to the second sensor. The second sensor detects whether the jig is in place; the second sensor transmits the detection signal to the control unit;

[0093] S5: In-place detection;

[0094] S5.1: When the first sensor detects that there is a lens on the transfer jig and the flow to the second sensor detects that the transfer jig is in place, the control unit controls the jig conveying line to stop, stops the transfer jig with the lens at the position of the second sensor; the control unit controls the surface detection mechanism to clamp the lens and detect the top surface shape data of the lens;

[0095] S5.11: The surface detection mechanism controls the robotic arm to drive the measurement fixture and extend it towards the notch of the transfer jig. At the same time, the measurement unit in the measurement fixture rises, creating a gap greater than the thickness of the lens to be accommodated between the measurement unit and the rotating unit;

[0096] S5.12: The measurement fixture inserts into the lens area with the gap between the measurement unit and the rotating unit, positioning the measurement unit and the rotating unit on both sides of the center of the lens;

[0097] S5.13: The measurement unit lowers the contact measurement rod, causing the contact ball to touch the top surface of the lens. The capacitance of the ceramic capacitor changes under the force of the contact ball. The contact measurement rod feeds back the detected pressure signal to the control unit. After receiving the signal, the control unit controls the robotic arm to lift, enabling the rotating unit to support and lock the bottom surface of the lens, completing the clamping of the lens; the robotic arm lifts the lens upward and removes it from the transfer jig;

[0098] S5.14: The control unit issues a command to detect the shape of the top surface of the lens. The rotating unit starts to rotate, and the measurement unit drives the contact measurement rod to move back and forth from the center of the lens to the outer edge along the movement path of the standard top surface shape of the lens; during the movement of the top surface of the lens, the pressure change data detected by the contact measurement rod is stored in the control unit;

[0099] S5.15: The control unit retrieves the stored pressure change data to the calculation module, converts the pressure change data into the vertical jump value of the deformation of the reaction diaphragm of the ceramic capacitor, and fits and plots the real-time shape curve of the top surface of the lens according to the movement path of the contact measurement rod based on the calculated vertical jump value, thereby generating the real-time surface shape data of the lens;

[0100] S5.16: The control unit fits the real-time surface shapes in the two directions of the contact measurement rod moving back and forth on the top surface of the lens, and makes two consecutive comparisons between the real-time surface shape data in the two directions and the standard top surface shape data;

[0101] S5.17: If the real-time surface shape data from both comparisons are within the upper and lower limits of the standard top surface shape data, the top surface shape of the lens meets the flatness of the production standard; the control unit controls the robotic arm to place the clamped lens on the top surface of the original transfer jig, and the jig transfer line conveys the lens that meets the standard to the unloading station;

[0102] S5.18: If the real-time surface shape data from both comparisons are not within the upper and lower limits of the standard top surface shape data, or if a single comparison is not within the upper and lower limits of the standard top surface shape data, the top surface shape of the lens does not meet the flatness of the production standard; the control unit controls the robotic arm to place the clamped lens in the repair area, and the jig transfer line sends the empty transfer jig to the unloading station;

[0103] S5.2: When the first sensor detects that there is no lens on the transfer jig and the flow reaches the second sensor detecting that the transfer jig is in place, the control unit controls the jig transfer line to continue flowing, sending the transfer jig without a lens to the blanking station; the surface detection mechanism has no clamping and detection actions; the control unit prompts the blanking station to recycle the transfer jig.

[0104] The technical features of the above embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above embodiments are described.

Claims

1. A lens detection device, characterized in that it includes a jig conveyor line, a transfer jig supported by a single cantilever, a surface detection mechanism adapted to the lens shape, and a control unit; a single lens is placed on the top surface of the single transfer jig, and the transfer jig is placed on the jig conveyor line for carrying the lens to move linearly along the conveying direction; the surface detection mechanism includes a robotic arm arranged on one side of the jig conveyor line and equipped with a measuring fixture, and the robotic arm is used to drive the measuring fixture to clamp, move, and measure the lens placed on the transfer jig; the measuring fixture includes a rotating unit and a measuring unit arranged oppositely, the rotating unit bears and locks the bottom surface of the lens, and the measuring unit includes a contact measuring rod that can be translated and lifted; the contact measuring rod includes a ceramic capacitor and a contact ball, and the contact ball contacts the top surface of the lens and conducts the force to the reaction diaphragm of the ceramic capacitor; the control unit is electrically connected to the jig conveyor line and the surface detection mechanism respectively; Detection steps: The control unit stores the standard top surface shape data of the lens to be detected. After the control unit controls the robotic arm to clamp the lens, it controls the rotating unit to drive the lens to rotate, and controls the contact measuring rod to move along the radial direction of the lens according to the top surface shape of the lens to be detected. By recording the pressure change of the ceramic capacitor and calculating the vertical displacement of the contact ball during the movement, the real-time surface shape data of the lens to be detected is fitted according to the continuously output displacement values; Comparison steps: The control unit compares the standard top surface shape data of the lens with the real-time surface shape data. If the real-time surface shape data is greater than the upper limit of the standard top surface shape data or the real-time surface shape data is less than the lower limit of the standard top surface shape data, it controls the robotic arm to place the clamped lens in the repair area. If the real-time surface shape data is within the upper and lower limit ranges of the standard top surface shape data, it controls the robotic arm to place the clamped lens on the top surface of the original transfer jig; The conveying direction of the jig conveyor line is provided with a first sensor for detecting the position of the lens and a second sensor for detecting the position of the jig arranged at intervals; both the first sensor and the second sensor are electrically connected to the control unit; Detection method: Both ends of the jig conveyor line are used to connect the feeding station and the discharging station, and the conveying direction of the jig conveyor line is from the feeding station to the discharging station; there is a repair area on one side of the surface detection mechanism; S1: The feeding station places the lens to be detected on the top surface of the transfer jig; S2: The feeding station turns the notch of the transfer jig towards the surface detection mechanism, places the transfer jig and the lens on the conveyor line of the feeding station, and the conveyor line of the feeding station conveys the transfer jig and the lens to the jig conveyor line; S3: The transfer jig and the lens enter the jig conveyor line and flow to the first sensor, and the first sensor detects whether there is a lens placed on the transfer jig; the first sensor transmits the detection signal to the control unit; S4: The transfer jig and the lens flow from the first sensor to the second sensor, and the second sensor detects whether the jig is in place; the second sensor transmits the detection signal to the control unit; S5: In-position detection; S5.1: When the first sensor detects a lens on the transfer jig and the second sensor detects that the transfer jig is in position, the control unit controls the jig transfer line to stop, stopping the transfer jig with the lens at the position of the second sensor; the control unit controls the surface detection mechanism to clamp the lens and detect the top surface shape data of the lens; S5.11: The surface detection mechanism controls the robotic arm to drive the measurement fixture and extend it towards the notch of the transfer jig. At the same time, the measurement unit in the measurement fixture rises, creating a gap greater than the thickness of the lens between the measurement unit and the rotation unit; S5.12: The measurement fixture extends into the lens with the gap between the measurement unit and the rotation unit, positioning the measurement unit and the rotation unit on both sides of the center of the lens; S5.13: The measurement unit lowers the contact measurement rod and makes the contact ball touch the top surface of the lens. The capacitance of the ceramic capacitor changes under the action of the force of the contact ball. The contact measurement rod feeds back the detected pressure signal to the control unit. After receiving the signal, the control unit controls the robotic arm to lift, enabling the rotation unit to carry and lock the bottom surface of the lens, completing the clamping of the lens; the robotic arm lifts the lens upward and removes it from the transfer jig; S5.14: The control unit issues an instruction to detect the top surface shape of the lens. The rotation unit starts to rotate, and the measurement unit drives the contact measurement rod to move back and forth from the center of the lens to the outer edge along the movement path of the standard top surface shape of the lens; During the movement of the top surface of the lens, the pressure change data detected by the contact measurement rod is stored in the control unit; S5.15: The control unit retrieves the stored pressure change data to the calculation module, converts the pressure change data into the vertical jump value of the deformation of the reaction diaphragm of the ceramic capacitor, and fits and plots the real-time shape curve of the top surface of the lens according to the movement path of the contact measurement rod based on the calculated vertical jump value, thereby generating the real-time surface shape data of the lens; S5.16: The control unit fits the real-time surface shapes in two directions of the contact measurement rod moving back and forth on the top surface of the lens, and makes two consecutive comparisons between the real-time surface shape data in the two directions and the standard top surface shape data; S5.17: If the real-time surface shape data of both comparisons is within the upper and lower limits of the standard top surface shape data, the top surface shape of the lens meets the flatness of the production standard; the control unit controls the robotic arm to place the clamped lens on the top surface of the original transfer jig, and the jig transfer line transfers the lens that meets the standard to the discharging station; S5.18: If the real-time surface shape data of both comparisons is not within the upper and lower limits of the standard top surface shape data, or if a single comparison is not within the upper and lower limits of the standard top surface shape data, the top surface shape of the lens does not meet the flatness of the production standard; the control unit controls the robotic arm to place the clamped lens in the repair area, and the jig transfer line sends the empty transfer jig to the discharging station; S5.2: When the first sensor detects that there is no lens on the transfer jig and the second sensor detects that the transfer jig is in place, the control unit controls the continuous flow of the jig transfer line, causing the transfer jig without a lens to flow to the discharging station; the surface detection mechanism has no clamping and detection actions; the control unit prompts the discharging station to recycle the transfer jig.

2. The lens detection device according to claim 1, wherein the contact measuring rod further includes a base shell, a conduction rod, and a control circuit board; the control circuit board and the contact ball are respectively installed at both ends of the base shell; the ceramic capacitor is installed under the control circuit board, the ceramic capacitor is electrically connected to the control circuit board, and the control circuit board is electrically connected to the control unit; the conduction rod is slidably installed in the base shell, and both ends of the conduction rod are respectively abutted and connected to the reaction diaphragm of the ceramic capacitor and the contact ball; When the contact ball is squeezed by the texture fluctuations on the surface of the lens during movement, the contact ball will produce a vertical jump, and the force will be transmitted to the reaction diaphragm through the conduction rod. The ceramic capacitor changes its capacitance under the deformation of the reaction diaphragm. The capacitance change amount is converted into an electrical signal through the control circuit board and conducted to the control unit. The control unit calculates the vertical displacement of the contact ball according to the electrical signal data transmitted by the control circuit board.

3. The lens detection device according to claim 1, wherein when clamping the lens, the rotating unit is arranged on the bottom surface of the lens, and the measuring unit is arranged on the top surface of the lens. The measuring unit further includes a vertical driving group and a horizontal driving group; the rotating unit is used to adsorb the bottom of the lens and drive the lens to rotate, and the contact measuring rod contacts the top surface of the lens and moves along the radial direction under the drive of the horizontal driving group and the vertical driving group.

4. The lens detection device according to claim 3, wherein the horizontal driving group and the vertical driving group drive the contact measuring rod to move from the center of the lens to the outer edge and from the outer edge of the lens to the center; When detecting a single lens, the control unit needs to control the contact measuring rod to measure the path from the center of the lens to the outer edge and back, and fit the real-time surface shapes in the two directions of the round trip. Through two consecutive comparisons of the real-time surface shape data in the two directions of the lens with the standard top surface shape data, if the real-time surface shape data of both comparisons are within the upper and lower limits of the standard top surface shape data, the control unit controls the robotic arm to place the clamped lens on the top surface of the original transfer jig, and the jig transfer line conveys the qualified lens to the next station.

5. The lens detection device according to claim 3, wherein The lateral drive group includes a first slide rail, a first slider, a mounting block, a lateral drive motor, a gear disc and a rack; the first slider is slidably mounted on the first slide rail, the mounting block is mounted on the first slider, and the contact measuring rod and the rack are respectively arranged on both sides of the mounting block; the lateral drive motor is suspended and mounted on the mounting block, the main shaft of the lateral drive motor passes through the mounting block and is in transmission connection with the gear disc, and the gear disc is in meshing transmission with the rack; The lateral drive motor is electrically connected to the control unit, the contact measuring rod is connected to the mounting block through the vertical drive group, and the lateral drive motor drives the mounting block to drive the contact measuring rod to move laterally.

6. The lens detection device according to claim 5, wherein The vertical drive group includes a second micro guide rail, a second micro slider, a connecting block, a transmission sleeve with external threads and a vertical drive motor; the second micro guide rail is mounted on the side surface of the mounting block, the second micro slider is slidably mounted on the second micro guide rail, both ends of the connecting block are respectively connected to the second micro slider and the contact measuring rod, and the transmission sleeve is sleeved on the contact measuring rod; The vertical drive motor is mounted on the top surface of the mounting block, the main shaft of the vertical drive motor passes through the mounting block and is in threaded transmission connection with the transmission sleeve; the vertical drive motor is electrically connected to the control unit, and the vertical drive motor drives the contact measuring rod to move up and down.

7. The lens detection device according to claim 1, wherein The rotating unit includes a vacuum chuck, a rotating motor and a negative pressure machine, and both the rotating motor and the negative pressure machine are electrically connected to the control unit; the rotating motor is in transmission connection with the back surface of the vacuum chuck through a transmission shaft, the vacuum chuck is connected to the negative pressure machine through an air pipe, and the front surface of the vacuum chuck is an adsorption surface for adsorbing and carrying the bottom surface of the lens.

8. The lens detection device according to claim 1, wherein A notch is provided on one side of the top surface of the transfer jig for carrying the lens, and the notch is away from the cantilever of the transfer jig.

Images