A lens multi-directional refraction uniformity detection device and detection method

Abstract

The present invention discloses a lens multi-directional refraction uniformity detection device and detection method, which includes a lens conveying unit for realizing uniform conveyance of a single lens, an LED point light source located on one side of the lens conveying unit, a light receiving unit located above the LED point light source and performing rotational motion, a host computer electrically connected to the light receiving unit and having a built-in illumination analysis system, and a material receiving unit located at the end of the lens conveying unit, wherein the lens conveying unit includes a plurality of lens carriers carrying single lens products, the light receiving unit includes a plurality of illumination sensors arranged in an array, and the LED point light source is located below the lens carrier at the detection station and the emitted light passes through the lens product on the lens carrier and then refracts onto the light receiving unit. The present invention can realize automatic illumination uniformity detection, automatic waste discharge, and automatic material receiving of TV lenses, greatly improving detection efficiency and reliability of detection results, and reducing costs.

Description

[Technical field]

[0001] The invention belongs to the technical field of optical mirror detection, and in particular relates to a lens multi-directional refraction uniformity detection device and detection method. [Background technology]

[0002] Backlit LCD screens are screens that use backlight as light source, which is formed by transmission or reflection of liquid crystal molecules. Taking LED backlight displays as an example, LEDs are arranged in an array, and a TV lens is installed on the top to convert point light sources into surface light sources, which is then used in conjunction with the LCD screen to achieve the display effect. TV lenses mostly use the principle of Fresnel lenses to enhance the refraction effect, and the multi-directional refraction illumination uniformity of the Fresnel texture directly affects the quality of the backlight.

[0003] The multi-directional refractive index detection of TV lenses in backlight modules is currently mostly done by manual visual inspection or handheld illuminance meter, and sometimes expensive imported equipment with telecentric lenses is required. The deviation caused by visual inspection or handheld illuminance meter also directly affects the reliability of multi-directional illumination uniformity detection, and there is a lack of quantitative test results to feed back to the forward processing equipment to improve the yield rate.

[0004] The prior art also uses illumination sensors to detect the illumination of the lens. However, for the detection of multi-directional refraction uniformity, in order to achieve high-precision detection and make the detection results reliable, the existing expensive imported equipment uses densely packed planar illumination sensors to collect illumination data of the illuminated area, and then calculates to determine whether the multi-directional refraction uniformity meets the requirements. However, there are the following defects: if the reliability and accuracy of the detection results are to be guaranteed, the layout density of the illumination sensors must be very dense, and the layout range must cover the entire illumination area of ​​the lens. Therefore, its production cost will be very high and not economical enough; but if the density of the illumination sensor layout is reduced, the detection results will be inaccurate, the reliability of the detection results is not high, and the detection requirements cannot be met.

[0005] Therefore, it is necessary to provide a new lens multi-directional refraction uniformity detection device and detection method to solve the above problems. [Summary of the invention]

[0006] The main purpose of the present invention is to provide a lens multi-directional refraction uniformity detection device, which can realize automatic illumination uniformity detection, automatic waste discharge, and automatic material collection of TV lenses, greatly improving the detection efficiency and the reliability of the detection results, and reducing the cost.

[0007] The present invention achieves the above-mentioned purpose through the following technical scheme: a lens multi-directional refraction uniformity detection device, which includes a lens conveying unit for realizing uniform conveying of a single lens, an LED point light source located on one side of the lens conveying unit, a light receiving unit located above the LED point light source and performing rotational motion, a host computer electrically connected to the light receiving unit and having a built-in illumination analysis system, and a material receiving unit located at the end of the lens conveying unit, the lens conveying unit includes a plurality of lens carriers carrying single lens products, the light receiving unit includes a plurality of illumination sensors arranged in an array, the LED point light source is located below the lens carrier at the detection station and the emitted light passes through the lens product on the lens carrier and then refracts onto the light receiving unit.

[0008] Furthermore, the lens conveying unit includes a first driving member, a conveyor belt driven by the first driving member for circular conveying, and a plurality of lens carriers arranged on the conveyor belt at equal distances; the lens carrier is reused with the circular movement of the conveyor belt, and receives the lens at one end of the conveyor belt, and then pours out the lens at the other end of the conveyor belt after being inspected by an inspection station.

[0009] Furthermore, the lens carrier is provided with a lens positioning bearing groove which passes through the upper and lower surfaces and is used to position and support the lens.

[0010] Furthermore, the light receiving unit includes a second driving member, a first support plate driven by the second driving member to rotate, a first cylinder fixed on the first support plate, a second support plate driven by the first cylinder to move up and down, a light receiving umbrella fixed on the second support plate, and a plurality of illumination sensors arranged in an array on the lower surface of the light receiving umbrella.

[0011] Furthermore, the illumination sensors are arranged in a manner of concentric circle arrangement with equal distances extending outward, or concentric circle arrangement with non-equidistant distances extending outward, or concentric circle staggered arrangement, or horizontal and vertical arrangement.

[0012] Furthermore, the rotation axis of the light receiving umbrella is parallel to the output axis of the second driving member but not colinear.

[0013] Furthermore, the host computer is electrically connected to the illumination sensor and the second driving component.

[0014] Furthermore, the material receiving unit includes a good product receiving box arranged at the end of the lens conveying unit, a defective product receiving box located next to the good product receiving box, a defective product guide plate that can receive the lens poured out from the end of the lens conveying unit and guide it into the defective product receiving box through horizontal movement, and a second cylinder that drives the defective product guide plate to move horizontally.

[0015] Another object of the present invention is to provide a detection method based on a lens multi-directional refraction uniformity detection device, which comprises the following steps:

[0016] 1) At the detection station, driving the light receiving unit to rotate by a set angle θ;

[0017] 2) Controlling the illumination sensor to cyclically switch within a set frequency, collecting data T times, obtaining an N×T illumination collection matrix P, and forming an illumination collection plane, where N is the number of illumination sensors in the light receiving unit;

[0018] 3) Calculate the average value of all values ​​in the illumination acquisition matrix P and compare it with the standard value. If the difference is within the allowable range, compare each value with the standard value. If both comparison values ​​are within the allowable error range, it means that the multi-directional refractive uniformity of the lens meets the standard; otherwise, it does not meet the standard.

[0019] Furthermore, it also includes conveying the lens to the detection station by a lens conveying unit, and the time the lens to be detected stays at the detection station is equal to or an integer multiple of the time the light receiving unit rotates the set angle θ.

[0020] Compared with the prior art, the beneficial effect of the lens multi-directional refraction uniformity detection device and detection method of the present invention is that the multi-directional refraction uniformity of the TV lens, especially the Fresnel texture based on the Fresnel lens principle, is realized online automatic detection, which completely replaces manual visual inspection or handheld illuminance meter operation, greatly improves the degree of automation and detection efficiency, and improves the accuracy of detection and the reliability of results. Compared with imported illumination detection equipment, it is more economical and greatly reduces the detection cost. This solution uses dynamic multiple collection points to collect illumination values, and cooperates with illumination sensors arranged in an array to collect values. On the one hand, it meets the detection needs of lenses of different models and characteristics, and improves the flexibility and versatility of the equipment. When the detection product is replaced, it is only necessary to reset the collection points and the illumination sensor receiving groups required to be extracted at the corresponding collection points, which is convenient for adjustment. On the other hand, it utilizes the rotational dynamic motion of the light receiving unit and cooperates with multiple collection points to collect illumination data, which greatly improves the dynamic density distribution of the illumination sensor, reduces the actual layout density of the illumination sensor on the light receiving unit, reduces costs, realizes multi-directional refraction illumination uniformity detection, greatly improves detection accuracy, and can be applied to lens detection needs with higher detection accuracy requirements.

Brief Description of the Drawings

[0021] Figure 1 It is a structural schematic diagram of an embodiment of the present invention;

[0022] Figure 2 It is a schematic diagram of a local structure of an embodiment of the present invention;

[0023] Figure 3 This is a schematic diagram of the structure of a light receiving umbrella in an embodiment of the present invention;

[0024] The numbers in the figure represent:

[0025] 100-lens multi-directional refraction uniformity detection device;

[0026] 1 lens conveying unit, 11 first driving member, 12 conveyor belt, 13 lens carrier plate, 14 lens positioning bearing groove; 2 LED point light source; 3 light receiving unit, 31 second driving member, 32 first support plate, 33 first cylinder, 34 second support plate, 35 light receiving umbrella, 36 illumination sensor; 4 host computer; 5 material receiving unit, 51 good product receiving box, 52 defective product receiving box, 53 defective product guide plate, 54 second cylinder. [Specific implementation method]

[0027] Example:

[0028] Please refer to Figure 1-Figure 3 The present embodiment is a lens multi-directional refraction uniformity detection device 100, which includes a lens conveying unit 1 for realizing uniform conveyance of a single lens, an LED point light source 2 located at one side of the lens conveying unit 1, a light receiving unit 3 located above the LED point light source 2 and performing rotational motion, a host computer 4 electrically connected to the light receiving unit 3 and having a built-in illumination analysis system, and a material receiving unit 5 located at the end of the lens conveying unit 1.

[0029] The lens conveying unit 1 comprises a first driving member 11, a conveyor belt 12 driven by the first driving member 11 for cyclic conveying, and a plurality of lens carriers 13 arranged on the conveyor belt 12 at equal distances. The lens carrier 13 is provided with a lens positioning bearing groove 14 that penetrates the upper and lower surfaces and positions and supports the lens. The lens carrier 13 is reused with the cyclic movement of the conveyor belt 12, and receives the lens at one end of the conveyor belt 12, and then unloads the lens at the other end of the conveyor belt 12 after being inspected at the inspection station.

[0030] The LED point light source 2 is set at the set detection station and is located below the lens carrier 13 and aligned with the lens positioning bearing groove 14. When the lens passes the detection station along with the lens carrier 13, the conveyor belt 12 stops moving, the LED point light source 2 is lit, and the light passes through the bottom of the lens positioning bearing groove 14 and irradiates the lens, and then refracts through the lens and hits the light receiving unit 3.

[0031] The light receiving unit 3 includes a second driving member 31, a first support plate 32 driven by the second driving member 31 to rotate, a first cylinder 33 fixed on the first support plate 32, a second support plate 34 driven by the first cylinder 33 to move up and down, a light receiving umbrella 35 fixed on the second support plate 34, and a plurality of illuminance sensors 36 arranged in a uniform array on the lower surface of the light receiving umbrella 35. The arrangement of the illuminance sensors 36 is an arrangement of concentric circles with equal distances, or an arrangement of concentric circles with non-equal distances, or an arrangement of concentric circles with staggered positions, or a horizontal and vertical arrangement. The arrangement of the illuminance sensors 36 can be set according to the detection requirements, and this embodiment does not limit it.

[0032] The rotation axis of the light receiving umbrella 35 is parallel to the output axis of the second driving member 31 but not colinear.

[0033] The host computer 4 is electrically connected to the illumination sensor 36 and the second driving member 31 .

[0034] The illumination analysis system may adopt illumination analysis software in the prior art.

[0035] The working principle of the illumination analysis system is as follows: the host computer 4 receives the data sent back by each illumination sensor 36, and controls the light receiving umbrella 35 to rotate continuously according to the detection needs, and sets a rotation detection angle area. The illumination sensor 36 collects data in batches to obtain real-time statistical calculation of the illumination at each point on the plane of the light receiving umbrella 35, and alarms when the illumination uniformity value exceeds the specified range, and transmits an operation signal to the receiving unit 5.

[0036] The material receiving unit 5 includes a good product receiving box 51 arranged at the end of the conveyor belt 12 in the lens conveying unit 1, a defective product receiving box 52 located next to the good product receiving box 51, a defective product guide plate 53 that can receive the lenses poured out from the conveyor belt 12 and guide them into the defective product receiving box 52 through horizontal movement, and a second cylinder 54 that drives the defective product guide plate 53 to move horizontally.

[0037] The working principle of the lens multi-directional refraction uniformity detection device 100 of this embodiment is as follows: the lenses are placed one by one in the lens carrier 13 on the lens conveying unit 1 and are positioned through the lens positioning bearing groove 14; then the lens conveying unit 1 is moved to the detection station; the LED point light source located at the detection station is lit, and the light is irradiated onto the lens from the bottom through the lens positioning bearing groove 14, and then refracted by the lens, the refracted light is received by the illumination sensor 36 on the light receiving umbrella 35 located above, and the light receiving umbrella 35 is rotated one by one to the set collection point angle position according to the set collection point, and uses The illumination analysis system in the upper computer 4 extracts the illumination value in the illumination sensor receiving group corresponding to the position of the collection point. When the light receiving umbrella 35 rotates the set angle, the illumination value collection of all collection points is completed. The illumination uniformity value of the lens is obtained through the internal calculation of the illumination analysis system, and then compared with the set illumination uniformity standard value to determine whether the lens is qualified; if qualified, it is directly poured into the good product receiving box 51 at the end of the conveyor belt 12; if unqualified, the second cylinder 54 drives the defective product guide plate 53 to extend, receive the defective products poured out of the conveyor belt 12, and then guide them into the defective product receiving box 52 to complete the collection.

[0038] This embodiment also provides a detection method based on the lens multi-directional refraction uniformity detection device, comprising the following steps:

[0039] 1) At the detection station, driving the light receiving unit to rotate a set angle θ, such as 90° or 180°;

[0040] 2) Controlling the illumination sensor to cyclically switch within a set frequency, collecting data T times, obtaining an N×T illumination collection matrix P, and forming an illumination collection plane, where N is the number of illumination sensors in the light receiving unit;

[0041] If data is collected every 10°, then within the range of 90° rotation, data is collected 9 times, and within the range of 180° rotation, data is collected 18 times;

[0042] The data collected by all illumination sensors at each set angle position are correspondingly arranged in a circular area, and an illumination collection plane can be obtained;

[0043] 3) Calculate the average value of all values ​​in the illumination acquisition matrix P and compare it with the standard value. If the difference is within the allowable range, compare each value with the standard value. If both comparison values ​​are within the allowable error range, it means that the multi-directional refractive uniformity of the lens meets the standard; otherwise, it does not meet the standard.

[0044] The above method also includes conveying the lens to the inspection station by the lens conveying unit 1, and the time the lens to be inspected stays at the inspection station is equal to or an integer multiple of the time the light receiving unit 3 rotates the set angle θ.

[0045] The light receiving unit 3 rotates continuously at a uniform speed, and the time taken by the lens carrier 13 arranged at equal distances on the lens conveying unit 1 to convey the next lens to be inspected to the inspection station is equal to or an integral multiple of the time taken by the light receiving unit 3 to rotate the set angle θ. In other embodiments, the light receiving unit 3 may remain stationary and not rotate continuously before the next lens to be inspected reaches the inspection station. When the light receiving unit 3 does not receive light, the illumination sensor 36 may remain in a closed state.

[0046] The beneficial effect of the lens multi-directional refraction uniformity detection device and detection method of this embodiment is that the multi-directional refraction uniformity of the TV lens, especially the Fresnel texture based on the Fresnel lens principle, is realized online automatic detection, completely replacing manual visual inspection or handheld illuminance meter operation, greatly improving the degree of automation and detection efficiency, and improving the accuracy of detection and the reliability of results. Compared with imported illuminance detection equipment, it is more economical and greatly reduces the detection cost. This scheme adopts dynamic multi-collection points to collect illuminance values, and cooperates with the array-arranged illuminance sensor to collect values. On the one hand, it meets the detection requirements of lenses of different models and characteristics, improves the flexibility and versatility of the equipment, and when the detection product is replaced, it only needs to reset the collection point and the illuminance sensor receiving group required to be extracted by the corresponding collection point, which is convenient for adjustment; on the other hand, it utilizes the rotational dynamic motion of the light receiving unit and cooperates with multiple collection points to collect illuminance data, greatly improving the dynamic density distribution of the illuminance sensor, reducing the actual layout density of the illuminance sensor on the light receiving unit, reducing the cost, realizing the illuminance uniformity detection of multi-directional refraction, greatly improving the detection accuracy, and can be applied to the lens detection requirements with higher detection accuracy requirements.

[0047] The above are only some embodiments of the present invention. For those skilled in the art, several modifications and improvements can be made without departing from the creative concept of the present invention, which all belong to the protection scope of the present invention.

Claims

1. A lens multi-directional refraction uniformity detection device, characterized in that: It includes a lens conveying unit for realizing uniform conveying of a single lens, an LED point light source located at one side of the lens conveying unit, a light receiving unit located above the LED point light source and performing rotational motion, a host computer electrically connected to the light receiving unit and having a built-in illumination analysis system, and a material receiving unit located at the end of the lens conveying unit, wherein the lens conveying unit includes a plurality of lens carriers carrying single lens products, the light receiving unit includes a plurality of illumination sensors arranged in an array, the LED point light source is located below the lens carrier at a detection station and the emitted light passes through the lens product on the lens carrier and then refracts onto the light receiving unit, and through the rotational dynamic motion of the light receiving unit, the illumination sensor collects illumination data according to the set multiple collection points, thereby improving the dynamic density distribution of the illumination sensor; The light receiving unit includes a second driving member, a first supporting plate driven by the second driving member to rotate, a first cylinder fixed on the first supporting plate, a second supporting plate driven by the first cylinder to move up and down, a light receiving umbrella fixed on the second supporting plate, and a plurality of illumination sensors arrayed on the lower surface of the light receiving umbrella; The material receiving unit includes a good product receiving box arranged at the end of the lens conveying unit, a defective product receiving box located next to the good product receiving box, a defective product guide plate that can receive the lenses poured out from the end of the lens conveying unit and guide them into the defective product receiving box through horizontal movement, and a second cylinder that drives the defective product guide plate to move horizontally.

2. The lens multi-directional refraction uniformity detection device according to claim 1, characterized in that: The lens conveying unit includes a first driving member, a conveyor belt driven by the first driving member for circular conveying, and a plurality of lens carriers arranged on the conveyor belt at equal distances; the lens carrier is reused with the circular movement of the conveyor belt, and receives the lens at one end of the conveyor belt, and then pours out the lens at the other end of the conveyor belt after being inspected by the inspection station.

3. The lens multi-directional refraction uniformity detection device according to claim 2, characterized in that: The lens carrier is provided with a lens positioning bearing groove which passes through the upper and lower surfaces and is used to position and support the lens.

4. The lens multi-directional refraction uniformity detection device according to claim 1, characterized in that: The illumination sensors are arranged in a manner of concentric circle equidistant outwardly extending arrangement, or concentric circle unequally spaced outwardly extending arrangement, or concentric circle staggered arrangement, or horizontally and vertically arranged.

5. The lens multi-directional refraction uniformity detection device according to claim 1, characterized in that: The rotation axis of the light receiving umbrella is parallel to the output axis of the second driving member but not colinear.

6. The lens multi-directional refraction uniformity detection device according to claim 1, characterized in that: The host computer is electrically connected to the illumination sensor and the second driving component.

7. A detection method based on the lens multi-directional refraction uniformity detection device as claimed in claim 1, characterized in that: It includes the following steps: 1) At the detection station, driving the light receiving unit to rotate by a set angle θ; 2) Controlling the illumination sensor to cyclically switch within a set frequency, collecting data T times, obtaining an N×T illumination collection matrix P, and forming an illumination collection plane, where N is the number of illumination sensors in the light receiving unit; 3) Calculate the average value of all values ​​in the illumination acquisition matrix P and compare it with the standard value. If the difference is within the allowable range, compare each value with the standard value. If both comparison values ​​are within the allowable error range, it means that the multi-directional refractive uniformity of the lens meets the standard; otherwise, it does not meet the standard.

8. The detection method of the lens multi-directional refraction uniformity detection device according to claim 7, characterized in that: The method also includes conveying the lens to a detection station by a lens conveying unit, wherein the time the lens to be detected stays at the detection station is equal to or an integer multiple of the time the light receiving unit rotates at a set angle θ.

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