Polarization error angle detection device and polarization error angle detection method

Abstract

The present invention discloses a polarization error angle detection device and a polarization error angle detection method thereof, comprising two polarizers, three photoelectric sensors, a rotating assembly, a switching assembly, a light source and a processor; the second polarizer comprises a first half and a second half equally divided and having a polarization direction angle of 45° or 135°; the light source is located on one side of the glasses to be tested, and evenly illuminates the lenses to be tested of the glasses to be tested; the first polarizer is arranged on the rotating assembly, the rotating assembly and the second polarizer are arranged on the switching assembly, the target position is located on the other side of the glasses to be tested, and when the second polarizer moves to the target position, the polarization direction of the first half is parallel to the height direction of the frame of the glasses to be tested; the three photoelectric sensors are respectively arranged on the first polarizer, the first half and the second half away from the light source; the processor is respectively connected to the three photoelectric sensors. The present invention can realize the detection of the polarization error angle of the lenses in the polarized glasses.

Description

Technical Field

[0001] The present invention relates to the technical field of lens detection, and in particular to a polarization error angle detection device and a polarization error angle detection method thereof. Background Art

[0002] Usually sunlight shines from all directions. When it hits an object, the light will be reflected back to form two kinds of light, horizontal and vertical. The horizontal light will cause dazzling random reflected light, and polarized glasses can filter out these reflected lights. In other words, when the polarized direction of the polarized lenses of polarized glasses is vertical (that is, the direction perpendicular to the line connecting the two connection points of the frame and the temples, that is, the height direction of the frame), the best effect can be achieved.

[0003] At present, polarization degree is also one of the important indicators for measuring polarized glasses. However, during the production and processing of polarized lenses, there will be deviations in the polarization angle of polarized lenses, and there will also be installation errors when polarized lenses are installed on the frames, making the polarization direction of the polarized lenses on the final polarized glasses exceed the allowable error range, reducing the user experience. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a polarization error angle detection device and a polarization error angle detection method thereof, which can realize the detection of the polarization error angle of lenses in polarized glasses.

[0005] In order to solve the above technical problems, the technical solution adopted by the present invention is: a polarization error angle detection device, comprising a first polarizer, a second polarizer, a first photoelectric sensor, a second photoelectric sensor, a third photoelectric sensor, a rotating component, a switching component, a light source and a processor; the second polarizer comprises a first half and a second half that are equally divided, and the angle between the polarization directions of the first half and the second half is 45° or 135°;

[0006] The light source is located at one side of the glasses to be tested, and evenly illuminates the lenses to be tested of the glasses to be tested;

[0007] The first polarizer is disposed on the rotating assembly, and the rotating assembly is used to drive the first polarizer to rotate;

[0008] The rotating assembly and the second polarizer are arranged on the switching assembly, and the switching assembly is used to drive the first polarizer and the second polarizer to move to a target position respectively, the target position is located at the other side of the glasses to be tested, the plane where the target position is located is parallel to the lens to be tested, and the projection of the lens to be tested on the plane where the target position is located covers the target position; when the second polarizer moves to the target position, the polarization direction of the first half is parallel to the height direction of the frame of the glasses to be tested;

[0009] The first photoelectric sensor is disposed on a side of the first polarizer away from the light source; the second photoelectric sensor is disposed on a side of the first half away from the light source, and the third photoelectric sensor is disposed on a side of the second half away from the light source;

[0010] The processor is connected to the first photoelectric sensor, the second photoelectric sensor and the third photoelectric sensor respectively.

[0011] The present invention also provides a polarization error angle detection method based on the polarization error angle detection device as described above, comprising:

[0012] Move the first polarizer to a target position by controlling the switching component;

[0013] The first polarizer is rotated by controlling the rotating assembly, and the highest voltage value and the lowest voltage value are calibrated according to the voltage signal output by the first photoelectric sensor;

[0014] Calculate the average of the highest voltage value and the lowest voltage value to obtain an intermediate voltage value;

[0015] Taking the rotation angle corresponding to the highest voltage value as the starting angle, rotating the first polarizer in the clockwise direction and the counterclockwise direction by the preset angles according to the preset number of rotations, and acquiring the voltage signal output by the first photoelectric sensor in turn, obtaining the voltage value corresponding to each first rotation angle, and recording it as a first comparison table;

[0016] Taking the rotation angle corresponding to the intermediate voltage value as the starting angle, rotating the first polarizer in the clockwise direction and the counterclockwise direction by the preset angles according to the preset number of rotations, and acquiring the voltage signal output by the first photoelectric sensor in turn, obtaining the voltage value corresponding to each second rotation angle, and recording it as a second comparison table;

[0017] The second polarizer is moved to a target position by controlling the switching component;

[0018] Acquire voltage signals output by the second photoelectric sensor and the third photoelectric sensor to obtain a first voltage value and a second voltage value;

[0019] Calculate an initial deviation angle according to the first voltage value and the second voltage value and the highest voltage value and the lowest voltage value as a current deviation angle;

[0020] Calculate a third voltage value and a fourth voltage value corresponding to the current deviation angle according to the first comparison table and the second comparison table respectively;

[0021] Calculating a new deviation angle according to the third voltage value and the fourth voltage value corresponding to the current deviation angle and the highest voltage value and the lowest voltage value;

[0022] If the absolute value of the difference between the new deviation angle and the current deviation angle is less than or equal to the preset iteration termination threshold, the new deviation angle is used as the final polarization error angle; otherwise, the new deviation angle is used as the current deviation angle, and the steps of calculating the third voltage value and the fourth voltage value corresponding to the current deviation angle according to the first comparison table and the second comparison table respectively are continued.

[0023] The beneficial effects of the present invention are: by rotating the first polarizer to calibrate the highest voltage value and the lowest voltage value, and by taking the angle corresponding to the highest voltage value and the middle voltage value as the starting angle, rotating in the positive and negative directions and obtaining the corresponding voltage value, the corresponding relationship between the relative rotation angle and the voltage value can be obtained; then, by moving the second polarizer to the target position, and based on the voltage values ​​output by the second photoelectric sensor and the third photoelectric sensor, combined with the corresponding relationship between the relative rotation angle and the voltage value, the deviation angle is analyzed and calculated. The present invention can detect the polarization error angle of polarized lenses more quickly and conveniently. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 Schematic diagram of the structure of the polarization error angle detection device of the first embodiment of the present invention;

[0025] Figure 2 Schematic diagram of the polarization direction of the second polarizer in Embodiment 1 of the present invention Figure 1 ;

[0026] Figure 3 Schematic diagram of the polarization direction of the second polarizer in Embodiment 1 of the present invention Figure 2 ;

[0027] Figure 4 is a schematic top view of a switching panel according to the first embodiment of the present invention;

[0028] Figure 5 It is a right side schematic diagram of the carrying platform of the first embodiment of the present invention;

[0029] Figure 6 This is a flow chart of a method for detecting a polarization error angle according to a second embodiment of the present invention;

[0030] Figure 7 A schematic diagram of a voltage signal output by the second photoelectric sensor when the second polarizer rotates half a circle in the second embodiment of the invention;

[0031] Figure 8 Schematic diagram of the voltage signal output by the third photoelectric sensor when the second polarizer rotates half a circle in the second embodiment of the invention Figure 1 ;

[0032] Fig. 9 Schematic diagram of the voltage signal output by the third photoelectric sensor when the second polarizer rotates half a circle in the second embodiment of the invention Figure 2 .

[0033] Description of labels:

[0034] 1. First polarizer; 2. Second polarizer; 3. First photoelectric sensor; 4. Second photoelectric sensor; 5. Third photoelectric sensor; 6. Rotating assembly; 7. Switching assembly; 8. Light source; 9. Rack; 10. Glasses placement table; 11. Carrying table;

[0035] 201, first half; 202, second half;

[0036] 601, rotating motor; 602, driving shaft; 603, hollow shaft; 604, first gear; 605, second gear;

[0037] 701. Switch panel;

[0038] 1001. Glasses placement slot. DETAILED DESCRIPTION

[0039] In order to explain the technical content, achieved objectives and effects of the present invention in detail, the following is a detailed description in conjunction with the implementation methods and the accompanying drawings.

[0040] See also Figure 1 The present invention proposes a polarization error angle detection device, comprising a first polarizer, a second polarizer, a first photoelectric sensor, a second photoelectric sensor, a third photoelectric sensor, a rotating component, a switching component, a light source and a processor; the second polarizer comprises a first half and a second half that are equally divided, and the angle between the polarization directions of the first half and the second half is 45° or 135°;

[0041] The light source is located at one side of the glasses to be tested, and evenly illuminates the lenses to be tested of the glasses to be tested;

[0042] The first polarizer is disposed on the rotating assembly, and the rotating assembly is used to drive the first polarizer to rotate;

[0043] The rotating assembly and the second polarizer are arranged on the switching assembly, and the switching assembly is used to drive the first polarizer and the second polarizer to move to a target position respectively, the target position is located at the other side of the glasses to be tested, the plane where the target position is located is parallel to the lens to be tested, and the projection of the lens to be tested on the plane where the target position is located covers the target position; when the second polarizer moves to the target position, the polarization direction of the first half is parallel to the height direction of the frame of the glasses to be tested;

[0044] The first photoelectric sensor is disposed on a side of the first polarizer away from the light source; the second photoelectric sensor is disposed on a side of the first half away from the light source, and the third photoelectric sensor is disposed on a side of the second half away from the light source;

[0045] The processor is connected to the first photoelectric sensor, the second photoelectric sensor and the third photoelectric sensor respectively.

[0046] From the above description, it can be seen that the beneficial effect of the present invention is that the polarization error angle of the polarized lens can be detected more quickly and conveniently.

[0047] Furthermore, the target position includes a first target position and a second target position, and a projection of one lens of the glasses to be tested on a plane where the first target position is located covers the first target position; a projection of another lens of the glasses to be tested on a plane where the second target position is located covers the second target position.

[0048] It can be seen from the above description that the polarization error angles of the two lenses of the glasses to be tested can be tested sequentially.

[0049] Furthermore, the rotating assembly includes a rotating motor, a driving rotating shaft and a hollow shaft, and the first polarizer is arranged in the hollow shaft; the hollow shaft is transmission-connected to the driving rotating shaft, and the driving rotating shaft is connected to the rotating motor.

[0050] From the above description, it can be seen that the rotating motor will synchronously drive the active shaft to rotate, and the active shaft will drive the hollow shaft to rotate, thereby rotating the first polarizer in the hollow shaft and ensuring that the first photoelectric sensor can collect the light signal passing through the first polarizer in the hollow shaft.

[0051] Furthermore, a first gear is disposed on the outer surface of the driving shaft, a second gear is disposed on the outer surface of the first hollow shaft, and the first gear is transmission-connected to the second gear.

[0052] From the above description, it can be seen that the transmission ratio can be set to 1, so that when the driving shaft rotates one circle, the hollow shaft also rotates one circle.

[0053] Furthermore, the switching component includes a switching panel and a driving motor, the switching panel is provided with a carrying platform, the carrying platform is provided with a polarizer placement slot, and the second polarizer is arranged in the polarizer placement slot; the rotating component is arranged on the switching panel; the driving motor is connected to the switching panel, and is used to drive the switching panel to move or rotate, so that the first polarizer and the second polarizer are moved to the target positions respectively.

[0054] It can be seen from the above description that the switching panel is driven to move by the driving motor, so that the first polarizer and the second polarizer can be moved to the target positions respectively.

[0055] See also Figure 6 The present invention also proposes a polarization error angle detection method based on the polarization error angle detection device as described above, comprising:

[0056] Move the first polarizer to a target position by controlling the switching component;

[0057] The first polarizer is rotated by controlling the rotating assembly, and the highest voltage value and the lowest voltage value are calibrated according to the voltage signal output by the first photoelectric sensor;

[0058] Calculate the average of the highest voltage value and the lowest voltage value to obtain an intermediate voltage value;

[0059] Taking the rotation angle corresponding to the highest voltage value as the starting angle, rotating the first polarizer in the clockwise direction and the counterclockwise direction by the preset angles according to the preset number of rotations, and acquiring the voltage signal output by the first photoelectric sensor in turn, obtaining the voltage value corresponding to each first rotation angle, and recording it as a first comparison table;

[0060] Taking the rotation angle corresponding to the intermediate voltage value as the starting angle, rotating the first polarizer in the clockwise direction and the counterclockwise direction by the preset angles according to the preset number of rotations, and acquiring the voltage signal output by the first photoelectric sensor in turn, obtaining the voltage value corresponding to each second rotation angle, and recording it as a second comparison table;

[0061] The second polarizer is moved to a target position by controlling the switching component;

[0062] Acquire voltage signals output by the second photoelectric sensor and the third photoelectric sensor to obtain a first voltage value and a second voltage value;

[0063] Calculate an initial deviation angle according to the first voltage value and the second voltage value and the highest voltage value and the lowest voltage value as a current deviation angle;

[0064] Calculate a third voltage value and a fourth voltage value corresponding to the current deviation angle according to the first comparison table and the second comparison table respectively;

[0065] Calculating a new deviation angle according to the third voltage value and the fourth voltage value corresponding to the current deviation angle and the highest voltage value and the lowest voltage value;

[0066] If the absolute value of the difference between the new deviation angle and the current deviation angle is less than or equal to the preset iteration termination threshold, the new deviation angle is used as the final polarization error angle; otherwise, the new deviation angle is used as the current deviation angle, and the steps of calculating the third voltage value and the fourth voltage value corresponding to the current deviation angle according to the first comparison table and the second comparison table respectively are continued.

[0067] From the above description, it can be seen that the polarization error angle of the polarized lens can be detected more quickly and conveniently.

[0068] Furthermore, it also includes:

[0069] If the polarization error angle is smaller than the preset deviation threshold, it is determined that the current lens to be tested has passed the test.

[0070] Further, the initial deviation angle is calculated according to the first voltage value and the second voltage value and the highest voltage value and the lowest voltage value as follows:

[0071] According to the formula θ 1 =arctan(Vb / Va) / 2, calculate the initial polarization angle θ 1 , where Va = V 1 -(Vmax+Vmin) / 2, Vb=V 2 -(Vmax+Vmin) / 2, V 1 is the first voltage value, V 2 is the second voltage value, Vmax is the maximum voltage value, and Vmin is the minimum voltage value.

[0072] Further, the calculation of the new deviation angle according to the third voltage value and the fourth voltage value corresponding to the current deviation angle and the highest voltage value and the lowest voltage value is specifically as follows:

[0073] According to the formula θ i+1 =arctan(Vc / Vd) / 2, calculate the new deviation angle θ i+1 , where Vc = V 3 -(Vmax+Vmin) / 2, Vd=V 4 -(Vmax+Vmin) / 2, V 3 is the current deviation angle θ i The corresponding third voltage value, V 4 is the current deviation angle θ i Corresponding to the fourth voltage value, Vmax is the highest voltage value, and Vmin is the lowest voltage value.

[0074] Further, the third voltage value and the fourth voltage value corresponding to the current deviation angle are calculated according to the first comparison table and the second comparison table respectively as follows:

[0075] Determine whether there is a first rotation angle in the first comparison table, the first rotation angle being equal to the current deviation angle;

[0076] If it exists, obtaining a voltage value corresponding to the first rotation angle as a third voltage value corresponding to the current deviation angle;

[0077] If not, obtain the two first rotation angles with the smallest difference from the current deviation angle in the first comparison table, and calculate the voltage value corresponding to the current deviation angle by linear interpolation according to the two first rotation angles and their corresponding voltage values, as the third voltage value corresponding to the current deviation angle;

[0078] Determine whether there is a second rotation angle in the second comparison table, the second rotation angle being equal to the current deviation angle;

[0079] If it exists, obtaining a voltage value corresponding to the second rotation angle as a fourth voltage value corresponding to the current deviation angle;

[0080] If it does not exist, obtain the two second rotation angles with the smallest difference from the current deviation angle in the second comparison table, and calculate the voltage value corresponding to the current deviation angle by linear interpolation based on the two second rotation angles and their corresponding voltage values, as the fourth voltage value corresponding to the current deviation angle.

[0081] From the above description, we can see that under ideal conditions, the obtained θ 1 It should be 0°, but due to errors caused by various situations (including errors caused by photoelectric sensors and errors caused by the calculation process), θ 1 There is a deviation relative to 0°, so the initial deviation angle θ calculated currently needs to be 1 Substitute into the first comparison table and the second comparison table to determine the final polarization error angle.

[0082] Embodiment 1

[0083] Please refer to Figure 1-5 , Embodiment 1 of the present invention is: a polarization error angle detection device, which can be used for batch detection of polarization error angles of polarized lenses of polarized glasses.

[0084] like Figure 1 As shown, it includes a first polarizer 1, a second polarizer 2, a first photoelectric sensor 3, a second photoelectric sensor 4, a third photoelectric sensor 5, a rotating component 6, a switching component 7, a light source 8 and a processor (not shown in the figure); in this embodiment, it also includes a frame 9 and a glasses placement table 10.

[0085] Among them, Figure 2-3As shown, the second polarizer is a combined polarizer, which includes a first half and a second half that are equally divided, and the angle between the polarization directions of the first half and the second half is 45° or 135°.

[0086] like Figure 1 As shown, the light source 8 is arranged on the frame 9, preferably, arranged on the top of the frame 9, and the light source 8 is emitting light downward. The glasses placement table 10 is also arranged on the frame 9 and is located below the light source 8; the glasses placement table 10 is provided with a glasses placement groove 1001, when the glasses to be tested are placed in the glasses placement groove 1001 (the glasses to be tested are along the Figure 1 The left and right direction of the glasses is the length direction of the frame of the glasses to be tested, that is, the arrangement direction of the two lenses. Figure 1 The left and right directions are the same), the light source 8 can evenly illuminate the test lens of the test glasses, and can pass through the test lens to illuminate the first polarizer 1 or the second polarizer 2 located below the test lens.

[0087] The switching component 7 is located below the glasses placement table 10, and the first polarizer 1 and the second polarizer 2 are arranged on the switching component 7. The switching component 7 is used to drive the first polarizer 1 and the second polarizer 2 to move to the target position respectively, wherein the target position is located on the side of the glasses to be tested away from the light source 8, that is, between the glasses placement table 10 and the switching component 7, and at the same time, the plane where the target position is located is parallel to the lens to be tested, and the projection of the lens to be tested on the plane where the target position is located covers the target position. In other words, the target position is located below the lens to be tested, and the light source 8 can illuminate the first polarizer 1 or the second polarizer 2 located at the target position after passing through the lens to be tested. Wherein, when the second polarizer 2 moves to the target position, the polarization direction of the first half 201 is parallel to the height direction of the frame of the glasses to be tested.

[0088] Specifically, combined Figure 1 and Figure 4 As shown, the switching assembly 7 includes a switching panel 701 and a driving motor (not shown in the figure), and the driving motor is connected to the switching panel 701. The rotating assembly 6 is arranged on the switching panel 7, and the first polarizer 1 is arranged in the rotating assembly 6, and the rotating assembly 6 is used to drive the first polarizer 1 to perform axial rotation; the switching panel 7 is also provided with a bearing platform 11, and the bearing platform 11 is provided with a polarizer placement groove, and the second polarizer 2 is arranged in the polarizer placement groove.

[0089] That is to say, a rotating assembly 6 and a supporting platform 11 are respectively provided on the switching panel 7, the first polarizer 1 is placed on the rotating assembly 6, and the second polarizer 2 is placed in the polarizer placement groove of the supporting platform 11. Furthermore, the first polarizer 1 and the second polarizer 2 are located on the same plane.

[0090] The driving motor 6 can drive the switching panel 701 to move or rotate, so that the first polarizer 1 and the second polarizer 2 are moved to the target position respectively. For example, if the switching panel is circular or fan-shaped, the driving motor can drive the switching panel to rotate, thereby moving the first polarizer or the second polarizer to the target position; the switching panel can also be long strip-shaped, and the driving motor can drive the switching panel to rotate along the parallel direction of the first polarizer and the second polarizer (i.e. Figure 1 and Figure 4 The first polarizer and the second polarizer can be moved to the target position in sequence by reciprocating motion (in the left and right directions).

[0091] Furthermore, in this embodiment, combined with Figure 1 and Figure 4 As shown, the rotating assembly 6 includes a rotating motor 601, a driving rotating shaft 602 and a hollow shaft 603. The first polarizer 1 is arranged in the hollow shaft 603 and is located on the same plane as the second polarizer 2. The hollow shaft 603 can be arranged on the switching panel 701 through a bearing. The hollow shaft 603 is connected to the driving rotating shaft 602 in a transmission manner, and the driving rotating shaft 602 is connected to the rotating motor 601. Specifically, a first gear 604 is provided on the outer surface of the driving rotating shaft 602, and a second gear 605 is provided on the outer surface of the first hollow shaft 603. The first gear 604 and the second gear 605 are connected in a transmission manner.

[0092] The rotating motor 601 will synchronously drive the active rotating shaft 602 to rotate, and the active rotating shaft 602 will drive the hollow shaft 603 to rotate, so that the first polarizer 1 in the hollow shaft 603 rotates.

[0093] like Figure 1 As shown, the first photoelectric sensor 3 is arranged on the side of the first polarizer 1 away from the light source 8; Figure 1 and Figure 5 As shown, the second photoelectric sensor 4 is arranged on the side of the first half side 201 away from the light source 8, and the third photoelectric sensor 5 is arranged on the side of the second half side 202 away from the light source 8. Preferably, the first photoelectric sensor 3 is arranged at the center of the first polarizer 1; the second photoelectric sensor 4 is arranged at the center of the first half side 201, and the third photoelectric sensor 5 is arranged at the center of the second half side 202. The processor (not shown in the figure) is connected to the first photoelectric sensor 3, the second photoelectric sensor 4 and the third photoelectric sensor 5 respectively.

[0094] That is to say, when the first polarizer is at the target position, the first photoelectric sensor can collect the light signal after the light source passes through the lens to be tested and the first polarizer in sequence; when the second polarizer is at the target position, the second photoelectric sensor can collect the light signal after the light source passes through the lens to be tested and the first half of the second polarizer in sequence, and the third photoelectric sensor can collect the light signal after the light source passes through the lens to be tested and the second half of the second polarizer in sequence. After the three photoelectric sensors collect the light signals, they will convert the light signals into electrical signals and then output them to the processor. The processor can obtain the polarization error angle of the lens to be tested by analyzing the electrical signals.

[0095] Furthermore, the processor is also connected to the driving motor and the rotating motor respectively. The processor can control the driving motor to move the first polarizer or the second polarizer to a target position, and can also control the rotating motor to rotate the first polarizer, thereby realizing automated detection.

[0096] Further, if the two lenses of the glasses to be tested are to be tested in sequence, the glasses placement table or the glasses to be tested can be moved so that the two lenses to be tested are located above the target position in sequence. The second polarizer can also be moved by the switching component so that the second polarizer is moved to the bottom of the two lenses to be tested in sequence. This embodiment adopts the latter, specifically, the target position includes a first target position and a second target position, and the first target position and the second target position correspond to the two lenses to be tested of the glasses to be tested respectively; that is, the projection of one lens to be tested of the glasses to be tested on the plane where the first target position is located covers the first target position; the projection of the other lens to be tested of the glasses to be tested on the plane where the second target position is located covers the second target position. Wherein, when the second polarizer moves to the first target position or the second target position, the polarization direction of the first half is parallel to the height direction of the frame of the glasses to be tested. Therefore, preferably, in this embodiment, the switching panel is a long strip, the first polarizer and the second polarizer are arranged on the switching panel along the length direction of the switching panel, and the driving motor drives the switching panel to move along its length direction.

[0097] In this embodiment, by setting a first polarizer and setting the first polarizer in a rotating assembly, the first polarizer can be rotated. By rotating the first polarizer, the maximum voltage value and the minimum voltage value in the voltage signal collected by the first photoelectric sensor can be calibrated, and the voltage value of the relative rotation angle of the angle corresponding to the maximum voltage value and the intermediate voltage value can be collected, so that the corresponding relationship between the voltage value adjacent to the maximum voltage value and the intermediate voltage value and the rotation angle can be obtained, which is used for the subsequent determination of the final polarization angle. By using a combined polarizer as the second polarizer and making the polarization directions of its two halves differ by 45° or 135°, the signal waveforms output by the second photoelectric sensor and the third photoelectric sensor are respectively consistent with the waveforms of the sine function and the cosine function, so that the deviation angle can be quickly calculated by forward and reverse tangent.

[0098] Embodiment 2

[0099] Please refer to Figure 6-9 This embodiment is a polarization error angle detection method of the lens polarization error angle detection device of embodiment 1. Before the detection, turn on the light source and place the glasses to be tested on the glasses placement table.

[0100] like Figure 6 As shown, the following steps are included:

[0101] S1: The first polarizer is moved to a target position by controlling the switching component; at this time, the light source can pass through the lens to be tested and illuminate the first polarizer located below the lens to be tested.

[0102] S2: Rotate the first polarizer by controlling the rotating assembly, and calibrate to obtain a maximum voltage value Vmax and a minimum voltage value Vmin according to the voltage signal output by the first photoelectric sensor.

[0103] By controlling the rotating assembly, rotating the first polarizer at a constant speed, and collecting the voltage signal output by the first photoelectric sensor in real time, a waveform with a period of 180° can be obtained, and the waveform is consistent with the shape of the waveform of the sine function. Therefore, by rotating the first polarizer for more than half a circle, the maximum voltage value Vmax and the minimum voltage value Vmin can be obtained. The maximum voltage value and the minimum voltage value depend on the intensity of the light emitted by the light source.

[0104] S3: Calculate the average of the highest voltage value and the lowest voltage value to obtain a middle voltage value Vmid; that is, Vmid=(Vmax+Vmin) / 2.

[0105] S4: Taking the rotation angle corresponding to the highest voltage value as the starting angle, according to the preset number of rotations, the first polarizer is rotated in the clockwise direction and the counterclockwise direction by the preset angles respectively, and the voltage signals output by the first photoelectric sensor are obtained in turn to obtain the voltage values ​​corresponding to the first rotation angles, which are recorded as a first comparison table.

[0106] For example, assuming that the preset number of rotations is 20 times, the preset angle is 0.5°, the starting angle is taken as 0°, and the clockwise direction is taken as the positive direction; first, the first polarizer is rotated 0.5° in the clockwise direction once. At this time, the rotation angle relative to the starting angle is 0.5°, that is, the current first rotation angle is 0.5°, and the voltage signal output by the first photoelectric sensor at this time is collected as the voltage value corresponding to the current first rotation angle; then the first polarizer is rotated 0.5° in the clockwise direction again. At this time, the rotation angle relative to the starting angle is 1°, that is, the current first rotation angle is 1°, and the voltage signal output by the first photoelectric sensor at this time is collected as the voltage value corresponding to the current first rotation angle; and so on, the voltage values ​​corresponding to the first rotation angles of 0.5°, 1°, 1.5°, ..., 10° are collected respectively.

[0107] Then the first polarizer is rotated back to the starting angle, that is, the rotation angle corresponding to the highest voltage value, and then the first polarizer is rotated counterclockwise by 0.5°. At this time, the rotation angle relative to the starting angle is -0.5°, that is, the current first rotation angle is -0.5°. The voltage signal output by the first photoelectric sensor at this time is collected as the voltage value corresponding to the current first rotation angle; then the first polarizer is rotated counterclockwise by 0.5° again. At this time, the rotation angle relative to the starting angle is -1°, that is, the current first rotation angle is -1°. The voltage signal output by the first photoelectric sensor at this time is collected as the voltage value corresponding to the current first rotation angle; and so on, the voltage values ​​corresponding to the first rotation angles of -0.5°, -1°, -1.5°, ..., -10° are collected respectively.

[0108] The first comparison table finally obtained is shown in Table 1.

[0109] Table 1: First comparison table

[0110] The first rotation angle α -10° … -1° -0.5° 0° 0.5° 1° … 10° Voltage value <![CDATA[A 40 ]]> … <![CDATA[A 22 ]]> <![CDATA[A 21 ]]> Vmax <![CDATA[A 1 ]]> <![CDATA[A 2 ]]> … <![CDATA[A 20 ]]>

[0111] S5: Taking the rotation angle corresponding to the intermediate voltage value as the starting angle, according to the preset number of rotations, the first polarizer is rotated in the clockwise direction and the counterclockwise direction by the preset angles respectively, and the voltage signals output by the first photoelectric sensor are obtained in turn to obtain the voltage values ​​corresponding to each second rotation angle, and recorded as a second comparison table.

[0112] Referring to step S4, the second comparison table obtained in this step is shown in Table 2.

[0113] Table 2: Second comparison table

[0114] The second rotation angle β -10° … -1° -0.5° 0° 0.5° 1° … 10° Voltage value <![CDATA[B 40 ]]> … <![CDATA[B 22 ]]> <![CDATA[B 21 ]]> Vmid <![CDATA[B 1 ]]> <![CDATA[B 2 ]]> … <![CDATA[B 20 ]]>

[0115] S6: Move the second polarizer to the target position by controlling the switching component; at this time, the polarization direction of the first half of the second polarizer is parallel to the height direction of the frame of the glasses to be tested, that is, parallel to the polarization direction of the lens to be tested in an ideal situation. The light source can pass through the lens to be tested to illuminate the second polarizer located below the lens to be tested.

[0116] S7: Obtain the voltage signals output by the second photoelectric sensor and the third photoelectric sensor to obtain a first voltage value V 1 and the second voltage value V 2 .

[0117] S8: Calculate an initial deviation angle according to the first voltage value, the second voltage value, the highest voltage value, and the lowest voltage value, and use the initial deviation angle as the current deviation angle.

[0118] Assume that the glasses to be tested are in an ideal condition, that is, the polarization direction of the lenses to be tested is parallel to the height direction of the frame, and the polarization direction of the first half of the second polarizer in the initial state is parallel to the polarization direction of the lenses to be tested. At this time, assuming that the second polarizer is rotated (clockwise or counterclockwise) for one circle, the voltage signal output by the second photoelectric sensor is as follows: Figure 7 As shown, the voltage signal output by the third photoelectric sensor is as follows Figure 8 or Fig. 9 As shown (the horizontal axis represents the rotation angle, and the vertical axis represents the voltage value); in this embodiment, Vmax = 3V, Vmin = 1V. It can be seen that the waveform of the voltage signal output by the second photoelectric sensor is consistent with the shape of the waveform of the cosine function, and its corresponding waveform expression is V 1 =cos2θ+(Vmax+Vmin) / 2; The waveform of the voltage signal output by the third photoelectric sensor is consistent with the waveform of the sine function, and its corresponding waveform expression is V 2 =sin2θ+(Vmax+Vmin) / 2, or V 2 =-sin2θ+(Vmax+Vmin) / 2.

[0119] According to the above waveform expression and the inverse tangent function, θ can be obtained.

[0120] Therefore, in this step, according to the formula θ 1 =arctan(Vb / Va) / 2, calculate the initial deviation angle θ 1, where Va = V 1 -(Vmax+Vmin) / 2, Vb=V 2 -(Vmax+Vmin) / 2, V 1 is the first voltage value, V 2 is the second voltage value, Vmax is the maximum voltage value, and Vmin is the minimum voltage value.

[0121] When the second polarizer is located at the target position, the polarization direction of the first half is parallel to the height direction of the frame of the glasses to be tested. Therefore, in an ideal case, the obtained θ 1 It should be 0°, but due to errors caused by various situations (including errors caused by photoelectric sensors and errors caused by the calculation process), θ 1 There is a deviation relative to 0°, so the initial deviation angle θ calculated currently needs to be 1 Substitute into the first comparison table and the second comparison table to determine the final polarization error angle.

[0122] S9: Calculate the third voltage value and the fourth voltage value corresponding to the current deviation angle according to the first comparison table and the second comparison table respectively; that is, obtain the voltage value corresponding to the current deviation angle in the first comparison table as the third voltage value; obtain the voltage value corresponding to the current deviation angle in the second comparison table as the fourth voltage value.

[0123] The method for determining the third voltage value is specifically as follows:

[0124] Determine whether there is a first rotation angle in the first comparison table, the first rotation angle being equal to the current deviation angle;

[0125] If it exists, obtaining a voltage value corresponding to the first rotation angle as a third voltage value corresponding to the current deviation angle;

[0126] If it does not exist, obtain the two first rotation angles with the smallest difference from the current deviation angle in the first comparison table, and calculate the voltage value corresponding to the current deviation angle by linear interpolation based on the two first rotation angles and their corresponding voltage values, as the third voltage value corresponding to the current deviation angle.

[0127] For example, assuming that the current deviation angle is at the first rotation angle α i and α i+1 According to α i and its corresponding voltage value and α i+1 and its corresponding voltage value, a two-point straight line equation is obtained by fitting, and then the current deviation angle is substituted into the two-point straight line equation, and the calculated voltage value is used as the third voltage value.

[0128] Similarly, the method for determining the fourth voltage value is specifically as follows:

[0129] Determine whether there is a second rotation angle in the second comparison table, the second rotation angle being equal to the current deviation angle;

[0130] If it exists, obtaining a voltage value corresponding to the second rotation angle as a fourth voltage value corresponding to the current deviation angle;

[0131] If it does not exist, obtain the two second rotation angles with the smallest difference from the current deviation angle in the second comparison table, and calculate the voltage value corresponding to the current deviation angle by linear interpolation based on the two second rotation angles and their corresponding voltage values, as the fourth voltage value corresponding to the current deviation angle.

[0132] For example, assuming that the current deviation angle is at the second rotation angle β i and β i+1 According to β i and its corresponding voltage value and β i+1 and its corresponding voltage value, a two-point straight line equation is obtained by fitting, and then the current deviation angle is substituted into the two-point straight line equation, and the calculated voltage value is used as the fourth voltage value.

[0133] S10: Calculate a new deviation angle according to the third voltage value, the fourth voltage value, the highest voltage value, and the lowest voltage value.

[0134] Specifically, according to the formula θ i+1 =arctan(Vc / Vd) / 2, calculate the new deviation angle θ i+1 , where Vc = V 3 -(Vmax+Vmin) / 2, Vd=V 4 -(Vmax+Vmin) / 2, V 3 is the current deviation angle θ i The corresponding third voltage value, V 4 is the current deviation angle θ i Corresponding to the fourth voltage value, Vmax is the highest voltage value, and Vmin is the lowest voltage value.

[0135] S11: Determine whether the absolute value of the difference between the new deviation angle and the current deviation angle is less than or equal to the preset iteration termination threshold Δ, i.e. |θ i+1 -θ i |≤Δ is established, if yes, execute step S13, if no, execute step S12. Preferably, the iteration termination threshold Δ is 0.01°.

[0136] S12: The new deviation angle is used as the current deviation angle, that is, i=i+1, the initial value of i is 1, and then the process returns to step S9.

[0137] S13: Taking the new deviation angle as the final polarization error angle, that is, θ i+1 As the final polarization error angle, the final polarization error angle represents the angle between the polarization direction of the current lens to be tested and the height direction of the frame.

[0138] Furthermore, after the final polarization error angle is determined, it can be determined whether the current lens to be tested meets the polarization requirement based on the final polarization error angle. Specifically, if the final deviation angle is less than the preset deviation threshold, the current lens to be tested is determined to have passed the test, otherwise, the current lens to be tested is determined to have failed the test.

[0139] Furthermore, the detection method of this embodiment can be applied to batch testing, and a pair of glasses to be tested in the batch to be tested is randomly selected and placed on the glasses placement table, and steps S1-S5 are performed on any lens to be tested. Then, each pair of glasses to be tested in the same batch to be tested is placed on the glasses placement table in turn, and steps S7-S13 are performed. In other words, for the same batch to be tested, steps S1-S5 only need to be performed once to obtain the first comparison table and the second comparison table corresponding to the batch.

[0140] Furthermore, if two lenses to be tested of each pair of glasses to be tested are to be tested, then for each pair of glasses to be tested, the second polarizer is first moved to the first target position by controlling the switching component, and then steps S7-S13 are executed to detect one lens to be tested, and then the second polarizer is moved to the second target position by controlling the switching component, and then steps S7-S13 are executed to detect the other lens to be tested.

[0141] This embodiment can detect the polarization error angle of polarized lenses more quickly and conveniently; and can be carried out in batches, effectively locking and eliminating defective products in a single batch; and supplementing the imperfections of the domestic industry's polarization error angle calibration method for polarized lenses.

[0142] In summary, the polarization error angle detection device and polarization error angle detection method provided by the present invention can detect the polarization error angle of polarized lenses more quickly and conveniently; and can be carried out in batches to effectively lock and eliminate defective products in a single batch; and supplement the imperfections of the domestic industry's polarization error angle calibration method for polarized lenses.

[0143] The above descriptions are merely embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent transformations made using the contents of the present invention's specification and drawings, or directly or indirectly applied in related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A polarization error angle detection device, characterized in that: The device comprises a first polarizer, a second polarizer, a first photoelectric sensor, a second photoelectric sensor, a third photoelectric sensor, a rotating component, a switching component, a light source and a processor; the second polarizer comprises a first half and a second half that are equally divided, and the angle between the polarization directions of the first half and the second half is 45° or 135°; The light source is located at one side of the glasses to be tested, and evenly illuminates the lenses to be tested of the glasses to be tested; The first polarizer is disposed on the rotating assembly, and the rotating assembly is used to drive the first polarizer to rotate; The rotating assembly and the second polarizer are arranged on the switching assembly, and the switching assembly is used to drive the first polarizer and the second polarizer to move to a target position respectively, the target position is located at the other side of the glasses to be tested, the plane where the target position is located is parallel to the lens to be tested, and the projection of the lens to be tested on the plane where the target position is located covers the target position; when the second polarizer moves to the target position, the polarization direction of the first half is parallel to the height direction of the frame of the glasses to be tested; The first photoelectric sensor is disposed on a side of the first polarizer away from the light source; the second photoelectric sensor is disposed on a side of the first half away from the light source, and the third photoelectric sensor is disposed on a side of the second half away from the light source; The processor is connected to the first photoelectric sensor, the second photoelectric sensor and the third photoelectric sensor respectively; The target position includes a first target position and a second target position, wherein a projection of a lens to be tested of the glasses to be tested on a plane where the first target position is located covers the first target position; a projection of another lens to be tested of the glasses to be tested on a plane where the second target position is located covers the second target position; The rotating assembly includes a rotating motor, a driving rotating shaft and a hollow shaft, wherein the first polarizer is arranged in the hollow shaft; the hollow shaft is drivingly connected to the driving rotating shaft, and the driving rotating shaft is connected to the rotating motor.

2. The polarization error angle detection device according to claim 1, characterized in that: A first gear is disposed on the outer surface of the driving shaft, and a second gear is disposed on the outer surface of the hollow shaft. The first gear is transmission-connected to the second gear.

3. The polarization error angle detection device according to claim 1, characterized in that: The switching component includes a switching panel and a driving motor. The switching panel is provided with a carrying platform. The carrying platform is provided with a polarizer placement slot, and the second polarizer is arranged in the polarizer placement slot; the rotating component is arranged on the switching panel; the driving motor is connected to the switching panel, and is used to drive the switching panel to move or rotate, so that the first polarizer and the second polarizer are moved to the target positions respectively.

4. A polarization error angle detection method based on the polarization error angle detection device according to any one of claims 1 to 3, characterized in that: include: Move the first polarizer to a target position by controlling the switching component; The first polarizer is rotated by controlling the rotating assembly, and the highest voltage value and the lowest voltage value are calibrated according to the voltage signal output by the first photoelectric sensor; Calculate the average of the highest voltage value and the lowest voltage value to obtain an intermediate voltage value; Taking the rotation angle corresponding to the highest voltage value as the starting angle, rotating the first polarizer in the clockwise direction and the counterclockwise direction by the preset angles according to the preset number of rotations, and acquiring the voltage signal output by the first photoelectric sensor in turn, obtaining the voltage value corresponding to each first rotation angle, and recording it as a first comparison table; Taking the rotation angle corresponding to the intermediate voltage value as the starting angle, rotating the first polarizer in the clockwise direction and the counterclockwise direction by the preset angles according to the preset number of rotations, and acquiring the voltage signal output by the first photoelectric sensor in turn, obtaining the voltage value corresponding to each second rotation angle, and recording it as a second comparison table; The second polarizer is moved to a target position by controlling the switching component; Acquire voltage signals output by the second photoelectric sensor and the third photoelectric sensor to obtain a first voltage value and a second voltage value; Calculate an initial deviation angle according to the first voltage value and the second voltage value and the highest voltage value and the lowest voltage value as a current deviation angle; Calculate a third voltage value and a fourth voltage value corresponding to the current deviation angle according to the first comparison table and the second comparison table respectively; Calculating a new deviation angle according to the third voltage value and the fourth voltage value corresponding to the current deviation angle and the highest voltage value and the lowest voltage value; If the absolute value of the difference between the new deviation angle and the current deviation angle is less than or equal to the preset iteration termination threshold, the new deviation angle is used as the final polarization error angle; otherwise, the new deviation angle is used as the current deviation angle, and the steps of calculating the third voltage value and the fourth voltage value corresponding to the current deviation angle according to the first comparison table and the second comparison table respectively are continued.

5. The polarization error angle detection method according to claim 4, characterized in that: Also includes: If the polarization error angle is smaller than the preset deviation threshold, it is determined that the current lens to be tested has passed the test.

6. The polarization error angle detection method according to claim 4, characterized in that: The initial deviation angle is calculated according to the first voltage value and the second voltage value and the highest voltage value and the lowest voltage value as follows: The initial polarization angle θ1 is calculated according to the formula θ1=arctan(Vb / Va) / 2, where Va=V1-(Vmax+Vmin) / 2, Vb=V2-(Vmax+Vmin) / 2, V1 is the first voltage value, V2 is the second voltage value, Vmax is the highest voltage value, and Vmin is the lowest voltage value.

7. The polarization error angle detection method according to claim 4, characterized in that: The calculation of the new deviation angle according to the third voltage value and the fourth voltage value corresponding to the current deviation angle and the highest voltage value and the lowest voltage value is specifically as follows: According to the formula θ i+1 =arctan(Vc / Vd) / 2, calculate the new deviation angle θ i+1 , where Vc=V3-(Vmax+Vmin) / 2, Vd=V4-(Vmax+Vmin) / 2, V3 is the current deviation angle θ i The corresponding third voltage value, V4, is the current deviation angle θ i Corresponding to the fourth voltage value, Vmax is the highest voltage value, and Vmin is the lowest voltage value.

8. The method for detecting polarization error angle according to claim 4, characterized in that: The calculation of the third voltage value and the fourth voltage value corresponding to the current deviation angle according to the first comparison table and the second comparison table is specifically: Determine whether there is a first rotation angle in the first comparison table, the first rotation angle being equal to the current deviation angle; If it exists, obtaining a voltage value corresponding to the first rotation angle as a third voltage value corresponding to the current deviation angle; If not, obtain the two first rotation angles with the smallest difference from the current deviation angle in the first comparison table, and calculate the voltage value corresponding to the current deviation angle by linear interpolation according to the two first rotation angles and their corresponding voltage values, as the third voltage value corresponding to the current deviation angle; Determine whether there is a second rotation angle in the second comparison table, the second rotation angle being equal to the current deviation angle; If it exists, obtaining a voltage value corresponding to the second rotation angle as a fourth voltage value corresponding to the current deviation angle; If it does not exist, obtain the two second rotation angles with the smallest difference from the current deviation angle in the second comparison table, and calculate the voltage value corresponding to the current deviation angle by linear interpolation based on the two second rotation angles and their corresponding voltage values, as the fourth voltage value corresponding to the current deviation angle.

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