Lens detection equipment and detection method thereof

Abstract

The invention discloses lens detection equipment and a detection method thereof, and relates to the technical field of lenses, and the lens detection equipment comprises a jig conveying line, a conveying jig, a surface detection mechanism and a control unit; the lens is placed on the conveying jig and moves in the linear direction through the jig conveying line. The mechanical arm of the surface detection mechanism drives the measuring clamp to clamp, move and measure the lens. The rotating unit of the measuring clamp 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 transmits pressure to the ceramic capacitor, and the control unit enables the contact measuring rod to move back and forth to the center and the outer circle edge of the lens according to a preset 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, so that the real-time surface shape of the lens is fitted, unqualified lenses are screened out by comparing the real-time surface shape with standard surface shape data of the lens, and automatic detection and sorting are realized; the problem that the measurement precision and efficiency are low when the flatness of the lens is measured is solved.

Description

Technical Field

[0001] The present invention relates to the field of lens technology, and in particular 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. Quartz glass lenses have high primary light transmittance and can meet the needs of high-power light sources for stage lights. However, the processability and mechanical properties of quartz glass are lower than those of PMMA or PC materials, especially its fragile nature, which brings challenges to the production of quartz glass lenses.

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

[0004] During the melting and forming process of quartz glass, its surface will have uneven texture. If the texture is too uneven, it will cause the grinding tool to exert excessive stress on the lens surface during polishing, causing the lens to crack or break directly. This makes the processing cost of quartz glass lenses very high and the yield rate is also low.

[0005] After the quartz glass is cut, it forms a single lens. Before entering the grinding and polishing process, since it is rough-processed and has not yet been coated, a contact thickness measurement method is usually used, such as a mechanical thickness measurement method, to measure the thickness of the lens surface at multiple points. By comparing the thickness of multiple points measured with the tolerance size specified in the processing drawing, lenses with uniform thickness, small and uniform surface undulations are screened out, 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 the traditional mechanical thickness measurement method are calipers, dial indicators and micrometers. 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 probe on the part is different, which may lead to large errors in the measurement results, and the measurement accuracy is usually less than 10 microns.

[0007] Therefore, it is necessary to design a lens flatness (i.e., multi-point thickness) measuring device that can automatically find the axis or vertex position of the lens, provide balanced pressure to the two surfaces and multiple points of the lens during the measurement process, and have higher measurement accuracy than a micrometer. The device can also improve the inspection 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 existing process of processing and screening stage lenses, there are problems of low measurement accuracy and efficiency in measuring the flatness of the lenses. Summary of the invention

[0010] The object of the present invention is to provide a lens detection device and a detection method thereof, so as to solve the problem of low measurement accuracy and efficiency in measuring the flatness of lenses in the existing stage lens processing and screening process.

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

[0012] In order to solve the above technical problems, the present invention provides the following technical solutions:

[0013] The present invention provides a lens detection device, comprising a jig conveying line, a conveying jig supported by a single cantilever, a surface detection mechanism of an adaptive lens shape, and a control unit; a single lens is placed on the top surface of a single conveying jig, and the conveying jig is placed on the jig conveying line and is used to carry the lens to move linearly along the conveying direction; the surface detection mechanism comprises a mechanical arm arranged on one side of the jig conveying line and equipped with a measuring fixture, and the mechanical arm is used to drive the measuring fixture to clamp, move and measure the lens placed on the conveying jig; the measuring fixture comprises a rotating unit and a measuring unit arranged relatively, the rotating unit carries and locks the bottom surface of the lens, and the measuring unit comprises a contact measuring rod that can be moved horizontally and lifted; the contact measuring rod comprises a ceramic capacitor and a contact ball, and the contact ball contacts the top surface of the lens and transmits force to a reaction diaphragm of the ceramic capacitor; the control unit is electrically connected to the jig conveying line and the surface detection mechanism respectively;

[0014] Detection step: the control unit stores standard top surface shape data of the lens to be detected, controls the mechanical arm to clamp the lens, controls the rotation unit to drive the lens to rotate, 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, records the pressure change of the ceramic capacitor and calculates and outputs the vertical displacement of the contact ball during the movement, and fits the real-time surface shape data of the lens to be detected according to the continuously output displacement values;

[0015] Comparison step: the control unit compares the standard top surface shape data and the real-time surface shape data of the lens. 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, the control unit controls the robot arm to place the clamped lens to the rework area; if the real-time surface shape data is within the upper and lower limits of the standard top surface shape data, the control unit controls the robot arm to place the clamped lens on the top surface of the original conveying jig.

[0016] In one embodiment, the contact measuring rod also includes a base shell, a conductive rod and a control circuit board; the control circuit board and the contact ball are respectively installed at two 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 conductive rod is slidably installed in the base shell, and the two ends of the conductive 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 lens surface during movement, the contact ball will produce vertical jumps and transmit the force to the reaction diaphragm through the conductive rod, the ceramic capacitor undergoes a capacitance change under the deformation of the reaction diaphragm, and the capacitance change is converted into an electrical signal through the control circuit board and transmitted to the control unit, and 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 of the embodiments, 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, and the measuring unit also 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.

[0018] In one embodiment, the lateral drive group and the vertical drive group drive the contact measuring rod to move along the center of the lens toward the outer edge and along the outer edge of the lens toward the center; when detecting a single lens, the controller needs to control the contact measuring rod to measure the path from the center of the lens to the outer edge, and fit the real-time surface shape in the two directions, and compare the real-time surface shape data in the two directions of the lens with the standard top surface shape data twice in a row. 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, the robot arm is controlled to place the clamped lens on the top surface of the original conveying jig, and the jig conveying line conveys the lens that meets the standards to the next workstation.

[0019] In one of the embodiments, the transverse driving group includes a first slide rail, a first slider, a mounting block, a transverse driving motor, a gear plate 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 transverse driving motor is suspended on the mounting block, the main shaft of the transverse driving motor passes through the mounting block and is transmission-connected to the gear plate, and the gear plate is meshed with the rack for transmission; the transverse 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 transverse driving motor drives the mounting block to drive the contact measuring rod to move transversely.

[0020] In one embodiment, the vertical drive group includes a second micro guide rail, a second micro slider, a connecting block, an externally threaded transmission screw sleeve and a vertical drive motor; the second micro guide rail is installed on the side of the mounting block, the second micro slider is slidably installed on the second micro guide rail, the two ends of the connecting block are respectively connected to the second micro slider and the contact measuring rod, and the transmission screw sleeve is sleeved on the contact measuring rod; the vertical drive motor is installed on the top surface of the mounting block, the main shaft of the vertical drive motor passes through the mounting block and is threadedly connected to the transmission screw 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.

[0021] In one embodiment, the rotating unit includes a vacuum suction cup, a rotating motor and a negative pressure machine, and the rotating motor and the negative pressure machine are both electrically connected to the control unit; the rotating motor is connected to the back side of the vacuum suction cup through a transmission shaft, the vacuum suction cup is connected to the negative pressure machine through an air pipe, and the front side of the vacuum suction cup is an adsorption surface for adsorbing and supporting 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 jig are arranged at intervals from each other in the conveying direction of the jig conveying line; the first sensor and the second sensor are both electrically connected to the control unit.

[0023] In one of the embodiments, a notch is provided on one side of the top surface of the conveying jig that carries the lens, and the notch is away from the cantilever of the conveying jig.

[0024] A lens detection method is also provided, wherein two ends of a jig transmission line are used to connect a loading station and an unloading station, and a transmission direction of the jig transmission line is from the loading station to the unloading station; a rework area is provided on one side of the surface detection mechanism;

[0025] The method comprises the following steps: S1: a loading station places a lens to be inspected on the top surface of a conveying fixture;

[0026] S2: The loading station places the notch of the transfer jig toward the surface detection mechanism, and places the transfer jig and the lens on the conveying line of the loading station. The conveying line of the loading station conveys the transfer jig and the lens to the jig conveying line;

[0027] S3: The conveying jig and the lens enter the jig conveying line and flow to the first sensor, the first sensor detects whether the lens is placed on the conveying jig; the first sensor transmits the detection signal to the control unit;

[0028] S4: The jig and the lens are transferred 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;

[0029] S5: In-place detection;

[0030] S5.1: When the first sensor detects that there is a lens on the conveying jig, and the second sensor detects that the conveying jig is in place, the control unit controls the jig conveying line to stop, and stops the conveying 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 robot arm to drive the measuring fixture to the notch of the conveying fixture, and at the same time, the measuring unit in the measuring fixture rises, so that a gap larger than the thickness of the lens is left between the measuring unit and the rotating unit;

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

[0033] S5.13: The measuring unit causes the contact measuring rod to descend and causes the contact ball to contact the top surface of the lens. The capacitance of the ceramic capacitor changes under 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 mechanical arm to lift up, causing the rotating unit to carry and lock the bottom surface of the lens, thereby completing the clamping of the lens. The mechanical arm lifts the lens upward and moves it out of the conveying fixture.

[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 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 calls the stored pressure change data to the calculation module, converts the pressure change data into a vertical jump value of the deformation of the reaction diaphragm of the ceramic capacitor, and fits and draws a real-time shape curve of the top surface of the lens according to the path of movement of the contact measuring rod, thereby generating real-time surface shape data of the lens;

[0036] S5.16: The control unit fits the real-time surface shape of the contact measuring rod in two directions when it moves back and forth on the top surface of the lens, and compares the real-time surface shape data in the two directions with the standard top surface shape data twice in a row;

[0037] S5.17: 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, the top surface shape of the lens meets the flatness of the production standard; the control unit controls the robot arm to place the clamped lens on the top surface of the original conveying fixture, and the fixture conveying line conveys the lens that meets the standard to the unloading station;

[0038] S5.18: If the real-time surface shape data of the two comparisons are both not within the upper and lower limits of the standard top surface shape data, or if the single comparison is not within the upper and lower limits of the standard top surface shape data, then the top surface shape of the lens does not meet the flatness of the production standard; the control unit controls the robot arm to place the clamped lens to the rework area, and the jig conveyor line sends the vacated conveyor jig to the unloading station;

[0039] S5.2: When the first sensor detects that there is no lens on the transfer jig, and the flow flows to the second sensor to detect that the transfer jig is in place, the control unit controls the jig conveyor line to continue to flow, and flows the transfer jig without the lens to the unloading station; the surface detection mechanism has no clamping and detection action; the control unit prompts the unloading 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 adopts a surface detection mechanism of an adaptive lens shape to store the top surface shapes of lenses of different shapes into a control unit. The control unit controls the measuring unit to make the contact measuring rod adaptively adjusted 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 equipment allows the lens to be inspected in all directions 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, can obtain all-round runout data of the top surface of the lens, and generate the three-dimensional shape of the top surface of the lens by 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 a pressure sensor and a contact ball design. Through sensitive pressure changes, the accuracy of contact detection can be improved to within 10 microns; the control unit records the pressure change value, and converts the pressure change value into a vertical displacement value through conversion calculation, and generates the three-dimensional shape of the top surface of the lens to achieve all-round detection of the lens, realize high-precision capture of the shape of the top surface of the lens, and realize high-precision and comprehensive detection of the lens by contact measurement, thereby improving the stability and accuracy of the automated equipment for lens surface jump detection.

[0044] In addition, the control unit compares the detected real-time surface shape data of the lens with the standard surface shape data. Unqualified lenses can be automatically sorted to the rework area through the robotic arm and the measuring fixture, while qualified lenses are placed on the top surface of the original conveying fixture through the robotic arm and the measuring fixture; thereby realizing contact-type automatic detection of lenses, greatly reducing the errors and inefficiency of manual measurement, improving the detection accuracy and efficiency of the lens production line, preparing for the screening of lenses entering the grinding and polishing process, reducing the chances of cracking and breakage of lenses during grinding and polishing, and thus improving the yield of the grinding and polishing process. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] In order to more clearly illustrate the technical solution of the present invention, the drawings required for use in the implementation mode will be briefly introduced below. Obviously, the drawings described below are only some implementation modes of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

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

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

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

[0049] Figure 4 It is a partial structural schematic diagram of the transmission jig, lens and measuring fixture of the present invention;

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

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

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

[0053] The reference numerals are as follows:

[0054] 1. Jig transmission line; 11. First sensor; 12. Second sensor;

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

[0056] 3. Surface detection mechanism;

[0057] 4. Robotic arm;

[0058] 5. Measuring fixture;

[0059] 6. Rotating unit; 61. Vacuum suction cup; 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. Transverse drive group; 721. First slide rail; 722. First slider; 723. Mounting block; 724. Transverse drive motor; 725. Gear plate; 726. Rack; 73. Vertical drive group; 731. Second micro guide rail; 732. Second micro slider; 733. Connecting block; 734. Transmission screw sleeve; 735. Vertical drive motor;

[0061] 8. Lens. DETAILED DESCRIPTION

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

[0063] A specific embodiment provides a lens detection device and a detection method thereof, wherein a mechanical arm of a surface detection mechanism drives a measuring fixture to clamp, move and measure the lens; a rotating unit of the measuring fixture locks the bottom surface of the lens and rotates, a contact ball of a contact measuring rod contacts the top surface of the lens and transmits pressure to a ceramic capacitor, a control unit causes the contact measuring rod to 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, and by comparing with the standard surface shape data of the lens, unqualified lenses are screened out, and automatic detection and sorting are realized; the problem of low measurement accuracy and efficiency in measuring the flatness of the lens in the processing and screening process of the existing stage lens is effectively solved.

[0064] In addition, all the contents of the configurations shown in the following embodiments are not necessarily limited to the solutions of the invention described in the claims.

[0065] A first embodiment of the lens detection device is as follows Figures 1 to 7 As shown, it includes a jig conveying line 1, a conveying 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 conveying jig 2, and the conveying jig 2 is placed on the jig conveying line 1, and is used to carry the lens 8 to move linearly along the conveying direction; the surface detection mechanism 3 includes a mechanical arm 4 arranged on one side of the jig conveying line 1 and equipped with a measuring fixture 5, and the mechanical arm 4 is used to drive the measuring fixture 5 to clamp, move and measure the lens 8 placed on the conveying jig 2; the measuring fixture 5 includes a rotating unit 6 and a measuring unit 7 arranged relatively, the rotating unit 6 carries and locks the bottom surface of the lens 8, and the measuring unit 7 includes a contact measuring rod 71 that can be moved horizontally and lifted; the contact measuring rod 71 includes a ceramic capacitor 711 and a contact ball 714, and the contact ball 714 contacts the top surface of the lens 8 and transmits force to the reaction diaphragm 712 of the ceramic capacitor 711;

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

[0067] Detection steps: the control unit stores the standard top surface shape data of the lens 8 to be detected. After the control unit controls the mechanical arm 4 to clamp the lens 8, the control unit 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 the vertical displacement of the output 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, the control unit controls the robot arm 4 to place the clamped lens 8 to the repair area; if the real-time surface shape data is within the upper and lower limits of the standard top surface shape data, the control unit controls the robot arm 4 to place the clamped lens 8 on the top surface of the original conveying fixture 2.

[0069] The lens 8 detection device of the present invention adopts a surface detection mechanism 3 of an adaptive lens 8 shape to store the top surface shapes of lenses 8 of different shapes into a control unit. The control unit controls the measuring unit 7 to make the contact measuring rod 71 adaptively adjusted 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 detected in all directions during rotation. Since the lens 8 is circular, the circular motion provided to the lens 8 by the rotating unit 6, 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, can obtain the all-round runout data of the top surface of the lens 8, and generate the three-dimensional shape of the top surface of the lens 8 by calculation, so as to obtain accurate top surface shape data.

[0071] Third, the contact measuring rod 71 controlled by the measuring unit 7 adopts 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 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 top surface of the lens 8, realizes all-round detection of the lens 8, realizes high-precision capture of the top surface shape of the lens 8, and realizes high-precision and comprehensive detection of the lens 8 by contact measurement, thereby improving the stability and accuracy of the automated equipment for lens 8 surface jump detection.

[0072] In addition, the real-time surface shape data of the detected lens 8 is compared with the standard surface shape data through the control unit. Unqualified lenses 8 can be automatically sorted to the rework area through the robot arm 4 and the measuring fixture 5, and qualified lenses 8 are placed on the top surface of the original conveying fixture 2 through the robot arm 4 and the measuring fixture 5; thereby, contact-type automatic detection of the lens 8 is realized, which greatly reduces the error and inefficiency of manual measurement, improves the detection accuracy and efficiency of the lens 8 production line, prepares for the screening of lenses 8 entering the grinding and polishing process, reduces the probability of cracking and breakage of lenses 8 during grinding and polishing, and thus improves the yield of the grinding and polishing process.

[0073] As one optional implementation,

[0074] Regarding the specific structure of the above-mentioned conveying fixture 2 cooperating with the robot arm 4 and the measuring unit 7 to clamp and move the lens 8, this embodiment Figure 2 and Figure 3 As shown, a notch 21 is provided on one side of the top surface of the conveying fixture 2 that carries the lens 8 , and the notch 21 is away from the cantilever 22 of the conveying fixture 2 .

[0075] Regarding the specific positions of the rotating unit 6 and the measuring unit 7, and the specific structure of the measuring unit 7 driving the contact measuring rod 71 to move vertically and horizontally, this embodiment is as follows: Figure 4As shown, 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 also 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 along the radial direction under the drive of the horizontal driving group 72 and the vertical driving group 73.

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

[0077] When inspecting 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 of the outer circle, and fit the real-time surface shape in the two directions. The real-time surface shape data in the two directions of the lens 8 are compared with the standard top surface shape data twice in a row. 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, the robot arm 4 is controlled to place the clamped lens 8 on the top surface of the original conveying fixture 2, and the fixture conveying line 1 conveys the lens 8 that meets the standards to the next workstation.

[0078] Regarding the detailed sensing structure of the contact measuring rod 71 and the specific method of measuring the vertical displacement of the contact ball 714 by pressure sensing, this embodiment is as follows: Figure 7 As shown, the contact measuring rod 71 also includes a base shell 715, a conductive rod 716 and a control circuit board 717; the control circuit board 717 and the contact ball 714 are respectively installed at the two ends of the base shell 715; a ceramic capacitor 711 is installed under the control circuit board 717, 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 conductive rod 716 is slidably installed in the base shell 715, and the two ends of the conductive rod 716 are respectively connected to the reaction diaphragm 712 of the ceramic capacitor 711 and the contact ball 714. The small ball 714 is abutted and connected; when the contact ball 714 is squeezed by the texture fluctuations on the surface of the lens 8 during its movement, the contact ball 714 will produce vertical jumps and transmit the force to the reaction diaphragm 712 through the conduction rod 716. The ceramic capacitor 711 undergoes a change in capacitance under the deformation of the reaction diaphragm 712, and the capacitance change 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 based on 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, the transverse drive group 72 includes a first slide rail 721, a first slider 722, a mounting block 723, a transverse drive motor 724, a gear plate 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, and the contact measuring rod 71 and the rack 726 are respectively arranged on both sides of the mounting block 723; the transverse drive motor 724 is suspended and mounted on the mounting block 723, and the main shaft of the transverse drive motor 724 passes through the mounting block 723 and is transmission-connected with the gear plate 725, and the gear plate 725 is meshed with the rack 726 for transmission; the transverse drive motor 724 is electrically connected to the control unit, the contact measuring rod 71 is connected to the mounting block 723 through the vertical drive group 73, and the transverse drive motor 724 drives the mounting block 723 to drive the contact measuring rod 71 to move horizontally.

[0082] Specifically, the specific structure of the vertical drive group 73 is as follows: Figures 4 to 6 As shown, the vertical drive group 73 includes a second micro guide rail 731, a second micro slider 732, a connecting block 733, an externally threaded transmission screw sleeve 734 and a vertical drive motor 735; the second micro guide rail 731 is installed on the side of the mounting block 723, the second micro slider 732 is slidably installed on the second micro guide rail 731, the two ends of the connecting block 733 are respectively connected to the second micro slider 732 and the contact measuring rod 71, and the transmission screw sleeve 734 is sleeved on the contact measuring rod 71; the vertical drive motor 735 is installed on the top surface of the mounting block 723, the main shaft of the vertical drive motor 735 passes through the mounting block 723 and is threadedly connected to the transmission screw sleeve 734; the vertical drive motor 735 is electrically connected to the control unit, and the vertical drive motor 735 drives the contact measuring rod 71 to move up and down.

[0083] Regarding the sensing mechanism for controlling the jig conveyor line 1, this embodiment is as follows. Figure 1 and Figure 2 As shown, a first sensor 11 for detecting the position of the lens 8 and a second sensor 12 for detecting the position of the jig are arranged in a spaced relationship in the conveying direction of the jig conveying line 1; both the first sensor 11 and the second sensor 12 are electrically connected to the control unit.

[0084] During application, in order to prevent the second sensor 12 from interfering with the movement 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 is 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 second sensor 12 is set and the detection height only needs to be able to detect the conveying jig 2. Specifically, the second sensor 12 can only detect the base of the conveying jig 2, thereby minimizing the height of the second sensor 12.

[0086] More specifically, the first sensor 11 and the second sensor 12 are both through-beam sensors, and the transmitting part and the receiving part thereof are respectively arranged on both sides of the conveying direction of the jig conveying line 1 .

[0087] A second embodiment of the lens detection device is as follows Figure 1 and Figure 3 As shown, the difference between this embodiment and the first embodiment is that the first sensor 11 and the second sensor 12 are arranged adjacent to each other as a group. When a single robot arm 4 performs detection, only one group needs to be arranged. When the production capacity of the lens 8 is expanded and the number of lenses 8 to be detected is large, such as Figure 3 As shown, multiple robot arms 4 and measuring fixtures 5 can be added. Accordingly, for each additional set of robot arms 4 and measuring fixtures 5, one more set of first sensors 11 and second sensors 12 needs to be added, so as to realize the linkage detection of the jig conveyor line 1, multiple conveying jigs 2 and multiple sets of surface detection mechanisms 3, thereby improving the transmission efficiency of the jig conveyor line 1.

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

[0089] The method comprises the following steps: S1: a loading station places a lens to be inspected on the top surface of a conveying fixture;

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

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

[0092] S4: The jig and the lens are transferred 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;

[0093] S5: In-place detection;

[0094] S5.1: When the first sensor detects that there is a lens on the conveying jig, and the second sensor detects that the conveying jig is in place, the control unit controls the jig conveying line to stop, and stops the conveying 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 robot arm to drive the measuring fixture to the notch of the conveying fixture, and at the same time, the measuring unit in the measuring fixture rises, so that a gap larger than the thickness of the lens is left between the measuring unit and the rotating unit;

[0096] S5.12: The measuring fixture is inserted into the lens with the gap between the measuring unit and the rotating unit, so that the measuring unit and the rotating unit are located on the two sides of the center of the lens respectively;

[0097] S5.13: The measuring unit causes the contact measuring rod to descend and causes the contact ball to contact the top surface of the lens. The capacitance of the ceramic capacitor changes under 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 mechanical arm to lift up, causing the rotating unit to carry and lock the bottom surface of the lens, thereby completing the clamping of the lens. The mechanical arm lifts the lens upward and moves it out of the conveying fixture.

[0098] 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 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;

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

[0100] S5.16: The control unit fits the real-time surface shape of the contact measuring rod in two directions when it moves back and forth on the top surface of the lens, and compares the real-time surface shape data in the two directions with the standard top surface shape data twice in a row;

[0101] S5.17: 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, the top surface shape of the lens meets the flatness of the production standard; the control unit controls the robot arm to place the clamped lens on the top surface of the original conveying fixture, and the fixture conveying line conveys the lens that meets the standard to the unloading station;

[0102] S5.18: If the real-time surface shape data of the two comparisons are both not within the upper and lower limits of the standard top surface shape data, or if the single comparison is not within the upper and lower limits of the standard top surface shape data, then the top surface shape of the lens does not meet the flatness of the production standard; the control unit controls the robot arm to place the clamped lens to the rework area, and the jig conveyor line sends the vacated conveyor 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 flows to the second sensor to detect that the transfer jig is in place, the control unit controls the jig conveyor line to continue to flow, and flows the transfer jig without the lens to the unloading station; the surface detection mechanism has no clamping and detection action; the control unit prompts the unloading station to recycle the transfer jig.

[0104] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, 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 conveying line, a conveying jig supported by a single cantilever, a surface detection mechanism of an adaptive lens shape, and a control unit; a single lens is placed on the top surface of a single conveying jig, and the conveying jig is placed on the jig conveying line to carry the lens to move linearly along the conveying direction; The surface detection mechanism includes a mechanical arm arranged on one side of the jig conveying line and equipped with a measuring fixture, and the mechanical arm is used to drive the measuring fixture to clamp, move and measure the lens placed on the conveying jig; The measuring fixture comprises a rotating unit and a measuring unit which are arranged relatively to each other, the rotating unit carries and locks the bottom surface of the lens, the measuring unit comprises a contact measuring rod which can be moved horizontally and lifted; the contact measuring rod comprises a ceramic capacitor and a contact ball, the contact ball contacts the top surface of the lens and transmits force to the reaction diaphragm of the ceramic capacitor; The control unit is electrically connected to the jig transmission line and the surface detection mechanism respectively; Detection step: the control unit stores standard top surface shape data of the lens to be detected, controls the mechanical arm to clamp the lens, controls the rotation unit to drive the lens to rotate, 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, records the pressure change of the ceramic capacitor and calculates and outputs the vertical displacement of the contact ball during the movement, and fits the real-time surface shape data of the lens to be detected according to the continuously output displacement values; Comparison step: the control unit compares the standard top surface shape data and the real-time surface shape data of the lens. 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, the control unit controls the robot arm to place the clamped lens to the rework area; if the real-time surface shape data is within the upper and lower limits of the standard top surface shape data, the control unit controls the robot arm to place the clamped lens on the top surface of the original conveying jig.

2. The lens detection device according to claim 1, characterized in that: The contact measuring rod also includes a base shell, a conductive rod and a control circuit board; the control circuit board and the contact ball are respectively installed at two 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 conductive rod is slidably installed in the base shell, and the two ends of the conductive rod are respectively abutted and connected with the reaction diaphragm of the ceramic capacitor and the contact ball; When the contact ball is squeezed by the fluctuation of the texture on the lens surface during its movement, the contact ball will jump vertically and transmit the force to the reaction diaphragm through the conduction rod. The ceramic capacitor will change its capacitance under the deformation of the reaction diaphragm, and the capacitance change will be converted into an electrical signal through the control circuit board and transmitted 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, characterized in that: When the lens is clamped, the rotating unit is arranged on the bottom surface of the lens, the measuring unit is arranged on the top surface of the lens, and the measuring unit further comprises a vertical driving group and a horizontal driving group; The rotating unit is used to absorb the bottom of the lens and drive the lens to rotate, and the contact measuring rod is driven by the lateral driving group and the vertical driving group to contact the top surface of the lens and move along the radial direction.

4. The lens detection device according to claim 3, characterized in that: The horizontal driving group and the vertical driving group drive the contact measuring rod to move along the center of the lens toward the outer edge of the lens and along the outer edge of the lens toward the center; When inspecting a single lens, the controller needs to control the contact measuring rod to measure the path from the center of the lens to the outer edge of the outer circle, and fit the real-time surface shape in the two directions of the round trip, and compare the real-time surface shape data in the two directions of the lens with the standard top surface shape data twice in a row. 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, the robot arm is controlled to place the clamped lens on the top surface of the original conveying jig, and the jig conveying line conveys the lens that meets the standards to the next workstation.

5. The lens detection device according to claim 3, characterized in that: The transverse drive group includes a first slide rail, a first slider, a mounting block, a transverse drive motor, a gear plate and a rack; the first slider is slidably mounted on the first slide rail, the mounting block is mounted on the first slider, the contact measuring rod and the rack are respectively arranged on both sides of the mounting block; the transverse drive motor is suspended and mounted on the mounting block, the main shaft of the transverse drive motor passes through the mounting block and is transmission-connected to the gear plate, and the gear plate is meshed with the rack for transmission; The transverse drive motor is electrically connected to the control unit, the contact measuring rod is connected to the mounting block via the vertical drive group, and the transverse drive motor drives the mounting block to drive the contact measuring rod to move transversely.

6. The lens detection device according to claim 5, characterized in that: The vertical drive group includes a second micro guide rail, a second micro slider, a connecting block, a transmission screw sleeve with an external thread, and a vertical drive motor; the second micro guide rail is mounted on a side of the mounting block, the second micro slider is slidably mounted on the second micro guide rail, the two ends of the connecting block are respectively connected to the second micro slider and the contact measuring rod, and the transmission screw sleeve is sleeved on the contact measuring rod; The vertical drive motor is installed on the top surface of the mounting block, and the main shaft of the vertical drive motor passes through the mounting block and is threadedly connected to the transmission screw 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, characterized in that: The rotating unit includes a vacuum suction cup, a rotating motor and a negative pressure machine, and the rotating motor and the negative pressure machine are both electrically connected to the control unit; the rotating motor is connected to the back side of the vacuum suction cup through a transmission shaft, and the vacuum suction cup is connected to the negative pressure machine through an air pipe, and the front side of the vacuum suction cup is an adsorption surface for adsorbing and supporting the bottom surface of the lens.

8. The lens detection device according to claim 1, characterized in that: A first sensor for detecting the position of the lens and a second sensor for detecting the position of the jig are arranged in a spaced relationship in the conveying direction of the jig conveying line; the first sensor and the second sensor are both electrically connected to the control unit.

9. The lens detection device according to claim 1, characterized in that: A notch is provided on one side of the top surface of the conveying jig that carries the lens, and the notch is away from the cantilever of the conveying jig.

10. A detection method for a lens detection device according to any one of claims 1 to 9, characterized in that: The following steps are included: The two ends of the jig conveyor line are used to connect the loading station and the unloading station. The conveying direction of the jig conveyor line is from the loading station to the unloading station. A rework area is provided on one side of the surface detection mechanism. S1: The loading station places the lens to be inspected on the top surface of the conveying fixture; S2: The loading station places the notch of the transfer jig toward the surface detection mechanism, and places the transfer jig and the lens on the conveying line of the loading station. The conveying line of the loading station conveys the transfer jig and the lens to the jig conveying line; S3: The conveying jig and the lens enter the jig conveying line and flow to the first sensor, the first sensor detects whether the lens is placed on the conveying jig; the first sensor transmits the detection signal to the control unit; S4: The jig and the lens are transferred 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-place detection; S5.1: When the first sensor detects that there is a lens on the conveying jig, and the second sensor detects that the conveying jig is in place, the control unit controls the jig conveying line to stop, and stops the conveying 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 robot arm to drive the measuring fixture to the notch of the conveying fixture, and at the same time, the measuring unit in the measuring fixture rises, so that a gap larger than the thickness of the lens is left between the measuring unit and the rotating unit; S5.12: The measuring fixture is inserted into the lens with the gap between the measuring unit and the rotating unit, so that the measuring unit and the rotating unit are located on the two sides of the center of the lens respectively; S5.13: The measuring unit causes the contact measuring rod to descend and causes the contact ball to contact the top surface of the lens. The capacitance of the ceramic capacitor changes under 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 mechanical arm to lift up, causing the rotating unit to carry and lock the bottom surface of the lens, thereby completing the clamping of the lens. The mechanical arm lifts the lens upward and moves it out of the conveying fixture. S5.14: The control unit issues a command 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; S5.15: The control unit calls the stored pressure change data to the calculation module, converts the pressure change data into a vertical jump value of the deformation of the reaction diaphragm of the ceramic capacitor, and fits and draws a real-time shape curve of the top surface of the lens according to the path of movement of the contact measuring rod, thereby generating real-time surface shape data of the lens; S5.16: The control unit fits the real-time surface shape of the contact measuring rod in two directions when it moves back and forth on the top surface of the lens, and compares the real-time surface shape data in the two directions with the standard top surface shape data twice in a row; S5.17: 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, the top surface shape of the lens meets the flatness of the production standard; the control unit controls the robot arm to place the clamped lens on the top surface of the original conveying fixture, and the fixture conveying line conveys the lens that meets the standard to the unloading station; S5.18: If the real-time surface shape data of the two comparisons are both not within the upper and lower limits of the standard top surface shape data, or if the single comparison is not within the upper and lower limits of the standard top surface shape data, then the top surface shape of the lens does not meet the flatness of the production standard; the control unit controls the robot arm to place the clamped lens to the rework area, and the jig conveyor line sends the vacated conveyor jig to the unloading station; S5.2: When the first sensor detects that there is no lens on the transfer jig, and the flow flows to the second sensor to detect that the transfer jig is in place, the control unit controls the jig conveyor line to continue to flow, and flows the transfer jig without the lens to the unloading station; the surface detection mechanism has no clamping and detection action; the control unit prompts the unloading station to recycle the transfer jig.

Images