Color temperature testing system and light-transmitting plate quality control method

Abstract

The invention relates to the technical field of optical testing, and discloses a color temperature testing system and a light-transmitting plate quality control method. The color temperature testing system comprises a display end, an LED analyzer, a plurality of probes, a light source and an auxiliary tool, the display end is connected with the LED analyzer, the LED analyzer is connected with the probes through optical fibers, the auxiliary tool comprises a mounting base, a pressing plate mounted on the mounting base and a driving device fixed to the mounting base and in transmission connection with the pressing plate, the light source is located on the mounting base, and the light source is located on the light source. The probe is fixed to the pressing plate and right faces the light source, the driving device can drive the pressing plate to drive the probe to move in the direction close to or away from the light source, and when the probe moves to be tightly attached to a to-be-detected plate above the light source, the LED analyzer can detect the color temperature after the light source penetrates through the to-be-detected plate. The color temperature testing system is higher in testing precision, and whether the to-be-tested plate is qualified or not can be judged according to whether the color coordinates of the to-be-tested plate exceed the standard color temperature floating interval or not.

Description

Technical Field

[0001] The present invention relates to the field of optical testing technology, and in particular to a color temperature testing system and a light-transmitting plate quality control method. Background Art

[0002] At present, the lampshades and backlight displays in the lighting industry mainly use light-transmitting polymer materials, such as PP (Polypropylene), ABS (Acrylonitrile Butadiene Styrene), PMMA (Polymethylmethacrylat), PC (Polycarbonate), etc. During production, polymer materials are usually injection molded into samples, and production is carried out after the samples are tested and qualified. Currently, the LAB value of the sample is tested in the reflection mode, that is, the light source is irradiated on the surface of the sample and the LAB value of the reflected light is detected. This detection method has poor sensitivity and cannot reflect whether the thickness of the material is uniform or whether the internal filling of the material is uniform, so it is impossible to effectively control the quality of the sample.

[0003] Samples can be tested using equipment such as spectrometers, but the cost of spectrometers is high and the light source of spectrometers is fixed, which makes them unsuitable for quality control of polymer material samples.

[0004] Therefore, there is an urgent need to develop a polymer material testing equipment and method that can reflect whether the thickness of the polymer material is uniform, whether the internal filling of the material is uniform, and has low cost, so as to improve the quality and efficiency of polymer material quality control. Summary of the invention

[0005] The purpose of the embodiments of the present invention is to provide a color temperature testing system and a translucent plate quality control method, which can test the color temperature of the translucent plate after light passes through it, and can judge whether the translucent plate is qualified according to whether the color coordinates of the translucent plate fall into the standard color temperature floating range.

[0006] To achieve the above object, the present invention adopts the following technical solutions:

[0007] On the one hand, a color temperature testing system is provided, including a display terminal, an LED analyzer, a plurality of probes, a light source and auxiliary tooling.

[0008] Among them, the display end is connected to the LED analyzer, and the LED analyzer is connected to the probe through an optical fiber. The auxiliary tooling includes a mounting seat, a pressing plate installed on the mounting seat, and a driving device fixed on the mounting seat and transmission-connected to the pressing plate. The light source is located on the mounting seat, and the probe is fixed on the pressing plate and faces the light source. The driving device can drive the pressing plate to drive the probe to move toward or away from the light source. When the probe moves to a plate to be tested that is close to above the light source, the LED analyzer can detect the color temperature of the light source after passing through the plate to be tested.

[0009] As a further solution of the color temperature testing system, the pressing plate is provided with a plurality of fixing holes along the vertical direction, the fixing holes correspond one-to-one to the probes, the probes are installed in the fixing holes, an opaque pad is fixed to the bottom of the pressing plate, the opaque pad is provided with a plurality of first avoidance holes corresponding one-to-one to the probes along its thickness direction, the detection end of the probe passes through the first avoidance hole and is flush with the lower surface of the opaque pad.

[0010] As a further solution of the color temperature testing system, the auxiliary tooling also includes a plurality of sleeves, the sleeves corresponding to the fixing holes one by one, the sleeves are fixed to the upper surface of the pressure plate, and the center line of the inner hole of the sleeve coincides with the center line of the fixing hole, and the probe is fixed in the inner hole of the sleeve by a fastener and extends out of the fixing hole to be flush with the lower surface of the opaque cushion.

[0011] As a further scheme of the color temperature testing system, the auxiliary tooling also includes a first intermediate connecting piece, which includes a connecting plate, a plurality of first guide rods and a plurality of springs. The connecting plate is located above the pressure plate and the sleeve, and a plurality of first guide holes are opened on the connecting plate. The first guide holes correspond to the first guide rods one-to-one, and the first guide rods are plugged into the first guide holes. There is a gap between the first guide rods and the first guide holes, and the lower end of the first guide rod is fixedly connected to the pressure plate. The connecting plate is connected to the driving device, and a plurality of second avoidance holes are penetrated through the connecting plate in the vertical direction. The second avoidance holes and the springs correspond to the sleeves one-to-one respectively. One end of the spring is inserted into the sleeve, and the other end is connected to the bottom of the connecting plate. The driving device is connected to the connecting plate, and the driving device can drive the connecting plate to move up and down.

[0012] As a further solution of the color temperature testing system, a plurality of first limiting grooves are provided at the bottom of the connecting plate, the first limiting grooves correspond to the second avoiding holes one by one, the second avoiding holes coincide with the center line of the first limiting grooves and pass through the bottom of the first limiting grooves, and the upper end of the spring is inserted into the first limiting groove and abuts against the bottom of the first limiting groove.

[0013] As a further solution of the color temperature testing system, a limit block is provided at the upper end of the first guide rod, and the outer circumferential surface of the limit block protrudes from the outer circumferential surface of the first guide rod. A plurality of third limit grooves are provided on the upper surface of the connecting plate, and the limit blocks cooperate with the third limit grooves one by one, and the first guide hole penetrates the bottom of the third limit groove in the vertical direction.

[0014] As a further solution of the color temperature testing system, the auxiliary tooling further includes an optical fiber insertion plate, and the optical fiber insertion plate is fixed to the connecting plate adjacent to the second avoidance hole.

[0015] As a further solution of the color temperature testing system, the auxiliary tooling also includes a second intermediate connecting piece, which includes a portal frame and a plurality of second guide rods. The portal frame is fixed on the mounting seat, and a crossbeam of the portal frame is penetrated by a plurality of second guide holes in a vertical direction. The driving device is installed on the crossbeam and connected to the connecting plate, the lower end of the second guide rod is connected to the connecting plate, and the upper end of the second guide rod is plugged into the second guide hole. The driving device can drive the connecting plate to drive the second guide rod to move up and down along the second guide hole.

[0016] As a further solution of the color temperature testing system, a mounting groove is provided on the upper surface of the mounting seat, the light source is installed in the mounting groove, and the upper surface of the light source is not higher than the upper surface of the mounting seat.

[0017] In another aspect, the present invention provides a polymer sheet quality control method, using the color temperature testing system, comprising:

[0018] Provide standard color temperature, with -(1~3)% and (1~3)% of the standard color temperature as floating space, and use the LED analysis software on the display end to obtain a color coordinate diagram with two color temperature quality control lines. The area between the two color temperature quality control lines is the standard color temperature floating range;

[0019] Provide a plate to be tested, place the plate to be tested on the mounting seat of the auxiliary tooling and cover the light source, then turn on the light source, and drive the pressing plate through the driving device to drive the probe to be pressed down until it is close to the surface of the plate to be tested; use the LED analyzer to detect the color coordinates of the light source after passing through the plate to be tested; observe the position of the color coordinates in the color coordinate diagram, if the color coordinates are within the standard color temperature floating range, the plate to be tested is qualified, if the color coordinates exceed the standard color temperature floating range, the plate to be tested is unqualified.

[0020] In the present invention, the color coordinates and color temperature can be obtained simultaneously by using an LED analyzer. By observing whether the detected color temperature is within the standard color temperature floating range in the color coordinate diagram, it can also be judged whether the board to be tested is qualified.

[0021] Furthermore, in order to improve the quality control accuracy, in addition to setting the standard color temperature floating range in the color coordinate diagram, a y-value quality control line can also be set, and the filler dispersion and thickness of the tested board can be quality controlled at the same time.

[0022] Beneficial effects:

[0023] The present invention can detect the color coordinates of the light source after passing through the plate to be tested through the LED analyzer, obtain the color temperature and color coordinates through the LED analysis software on the display end, and form a CIE color coordinate diagram. The x and y color coordinates corresponding to each test point can be visualized through the CIE color coordinate diagram. Compared with the traditional detection of LAB value through the light reflection principle of the sample surface, it can better reflect the real light transmittance and light density of the LED light after passing through the plate to be tested, and effectively improve the accuracy of color temperature measurement of light-transmitting plates, especially polymer plates.

[0024] The present invention draws two color temperature quality control lines based on -(1-3)% and (1-3)% of the standard color temperature. The area between the two color temperature quality control lines is the standard color temperature floating range. By observing whether the color coordinates or color temperature of the test point of the light source passing through the board to be tested is within the standard color temperature floating range, it can be directly judged whether the board to be tested is qualified. The light-transmitting board quality control method of the present invention can effectively improve the quality control accuracy and efficiency of the light-transmitting board.

[0025] The present invention provides an opaque soft pad at the lower end of the pressing plate. On the one hand, the probe will not be scratched when it contacts the plate to be tested due to the plate being too hard, thereby protecting the probe. On the other hand, the opaque soft pad can block the influence of other ambient light and stray light, thereby improving the accuracy of color temperature testing.

[0026] In the present invention, when the spacing between the plate to be tested, the probe and the light source is small or there is no spacing, that is, small spacing detection or no spacing detection is performed, the driving device drives the pressure plate to press down the plate to be tested above the light source, which will generate impact force on the plate to be tested, the probe and the light source. The present invention arranges a spring between the sleeve for installing the probe and the connecting plate. After the spring is compressed, it will generate a buffering force on the sleeve and the pressure plate. The buffering force can make the pressure plate play a buffering role after hitting the plate to be tested, thereby reducing the impact force on the plate to be tested, the probe and the light source, avoiding hard contact between the probe and the plate to be tested, and protecting the plate to be tested, the probe and the light source from being crushed.

[0027] The color temperature testing system of the present invention has simple structure, low cost investment, small footprint, low energy consumption, convenient operation, and is easy to carry. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The present invention is further described in detail below based on the accompanying drawings and embodiments.

[0029] Figure 1 The figure is a schematic diagram of the structure of the color temperature testing system according to an embodiment of the present invention.

[0030] Figure 2 It is a schematic structural diagram of the light source and the mounting base after being assembled according to an embodiment of the present invention.

[0031] Figure 3 It is a schematic diagram of the structure of the probe and the sleeve after assembly according to an embodiment of the present invention.

[0032] Figure 4 It is a schematic top view of the sleeve described in the embodiment of the present invention.

[0033] Figure 5 It is a structural schematic diagram of the pressure plate, the opaque cushion, the first guide rod, the connecting plate and the limit block according to an embodiment of the present invention after being assembled at a first viewing angle.

[0034] Figure 6 It is a structural schematic diagram from a second viewing angle after the pressing plate, the light-proof cushion, the first guide rod, the connecting plate and the limiting block according to an embodiment of the present invention are assembled.

[0035] Figure 7 It is a side view schematic diagram of the drive device (excluding the cylinder body) and the connecting plate after being assembled according to an embodiment of the present invention.

[0036] Figure 8 This is a color coordinate diagram obtained by converting the LAB values ​​of PC sheets of different thicknesses measured in the reflection mode.

[0037] Fig. 9 This is the color coordinate diagram of PC sheets of different thicknesses measured in light transmission mode.

[0038] Fig.10 This is a color coordinate diagram (including quality control lines) of different test points of the PC board to be tested according to the embodiment of the present invention.

[0039] Figure 1-Figure 7 middle:

[0040] 1. LED analyzer; 2. Probe; 3. Light source; 4. Optical fiber; 5. Auxiliary tooling; 51. Mounting seat; 511. Mounting slot; 52. Press plate; 521. Fixing hole; 53. Driving device; 531. Cylinder body; 532. Piston rod; 533. Rod sleeve; 534. Limiting ring; 54. Light-proof cushion; 541. First avoidance hole; 55. Sleeve; 551. Inner hole; 552. Second limiting slot; 56. First intermediate connection Part; 561, connecting plate; 5611, first guide hole; 5612, second avoidance hole; 5613, first limiting groove; 5614, third limiting groove; 562, first guide rod; 563, spring; 564, limiting block; 57, optical fiber insertion plate; 571, jack; 58, second intermediate connecting part; 581, door frame; 5811, crossbeam; 5812, support plate; 582, second guide rod; 583, guide cylinder. DETAILED DESCRIPTION

[0041] In order to make the technical problems solved by the present invention, the technical solutions adopted and the technical effects achieved clearer, the technical solutions of the embodiments of the present invention will be further described in detail below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0042] like Figures 1 to 3 As shown, this embodiment provides a color temperature testing system, including a display end, an LED analyzer 1, a plurality of probes 2 and a light source 3, the display end is connected to the LED analyzer 1, the LED analyzer 1 is connected to the probe 2 through an optical fiber 4, and also includes an auxiliary tooling 5, the auxiliary tooling 5 includes a mounting seat 51, a pressing plate 52 installed on the mounting seat 51, and a driving device 53 fixed on the mounting seat 51 and transmission-connected to the pressing plate 52, the light source 3 is located on the mounting seat 51, the probe 2 is installed on the pressing plate 52 and faces the light source 3, the driving device 53 can drive the pressing plate 52 to drive the probe 2 to move toward or away from the light source 3, when the probe 2 moves to the plate to be tested close to the light source 3, the color temperature of the light source after passing through the plate to be tested can be detected by the LED analyzer 1.

[0043] In this embodiment, in the initial state, the probe 2 is spaced a certain distance from the light source 3. After the plate to be tested is placed on the light source 3, the driving device 53 of the auxiliary tooling 5 drives the pressing plate 52 to move the probe 2 to close to the plate to be tested. After the light source 3 is turned on, the color temperature of the light source captured by the probe 2 and passing through the plate to be tested can be detected by the LED analyzer 1. The color coordinates can be obtained through the LED analysis software on the display end, and a CIE color coordinate diagram can be formed. The x and y color coordinates corresponding to each test point are reflected by the CIE color coordinate diagram. Compared with the traditional LAB value detection principle based on the light reflection principle of the surface of the plate to be tested, the color temperature test system of this embodiment can better reflect the real transmittance and optical density of the LED light after passing through the plate to be tested, and the color temperature test system of this embodiment has higher test accuracy.

[0044] In this embodiment, the optical signal collected by the probe 2 is transmitted to the LED analyzer 1 through the optical fiber 4. After the LED analyzer 1 converts the optical signal, it is analyzed by the LED analysis software installed on the display end to obtain the color coordinates and color temperature, and displayed on the display end. Therefore, the color temperature test system of the present invention can realize the visualization of the color coordinates.

[0045] The present embodiment does not limit the number of probes 2, which can be specifically set according to actual conditions. The light source 3 can be various common light sources, preferably an LED light source. The number of probes 2 and the number of lamp beads of the light source 3 can be the same or different. Specifically, the number of probes 2 is four, and the number of LED lamp beads on the light source 3 is also four, which are white light, red light, blue light, and green light. The four probes 2 correspond to the four LED lamp beads on the light source 3 one by one, and the color temperature of light sources of different colors can be obtained as needed.

[0046] Furthermore, if Figure 4 and Figure 5 As shown, the pressure plate 52 is provided with a plurality of fixing holes 521 along the vertical direction, and the fixing holes 521 correspond to the probes 2 one by one. A light-proof cushion 54 is fixed to the bottom of the pressure plate 52, and the light-proof cushion 54 is provided with a plurality of first avoidance holes 541 corresponding to the probes 2 one by one along its thickness direction. The detection end of the probe 2 passes through the fixing holes 521 and the first avoidance holes 541 and is flush with the lower surface of the light-proof cushion 54.

[0047] In this embodiment, an opaque soft pad 54 is provided at the lower end of the pressure plate 52. On the one hand, when the probe 2 contacts the plate to be tested, the detection end of the probe 2 will not be scratched due to the plate to be tested being too hard, thereby protecting the probe 2. On the other hand, the opaque soft pad 54 can block the influence of other ambient light and stray light, thereby improving the accuracy of color temperature testing.

[0048] Furthermore, the auxiliary tooling 5 also includes a plurality of sleeves 55, the sleeves 55 correspond to the fixing holes 521 one by one, the sleeves 55 are fixed to the upper surface of the pressure plate 52, and the center line of the inner hole 551 of the sleeve 55 coincides with the center line of the fixing hole 521, the probe 2 is fixed in the inner hole 551 of the sleeve 55 by a fastener, and the detection end of the probe 2 passes through the fixing hole 521 and the first avoidance hole 541 and is flush with the lower surface of the opaque cushion 54.

[0049] Specifically, the outer periphery of the sleeve 55 is provided with a threaded hole extending to the inner hole 551 thereof, and a screw can be screwed into the threaded hole to abut against the outer periphery of the probe 2, thereby fixing the probe 2 in the sleeve 55. When the height of the probe 2 needs to be adjusted, the screw can be loosened. The sleeve 55 in this embodiment can protect the probe 2.

[0050] Furthermore, the auxiliary tooling 5 also includes a first intermediate connecting member 56, which includes a connecting plate 561, a plurality of first guide rods 562 and a plurality of springs 563. The connecting plate 561 is located above the pressing plate 52 and the sleeve 55. The connecting plate 561 is provided with a plurality of first guide holes 5611. The first guide holes 5611 correspond to the first guide rods 562 one by one. The first guide rods 562 are plugged into the first guide holes 5611. There is a gap between the first guide rods 562 and the first guide holes 5611, and the lower portion of the first guide rods 562 is provided with a plurality of first guide holes 5611. The end is fixedly connected to the pressure plate 52, the connecting plate 561 is connected to the driving device 53, and a plurality of second avoidance holes 5612 are penetrated through the connecting plate 561 along the vertical direction. The second avoidance holes 5612 and the spring 563 correspond to the sleeve 55 one by one respectively. One end of the spring 563 is inserted into the sleeve 55, and the other end abuts against the bottom of the connecting plate 561. The driving device 53 is connected to the connecting plate 561, and the driving device 53 can drive the connecting plate 561 to move up and down. The optical fiber 4 passes through the second avoidance holes 5612 and the spring 563 in the vertical direction and is connected to the probe 2 in the sleeve 55.

[0051] The present embodiment does not limit the number of the first guide rods 562, which can be specifically set according to actual conditions. For example, the number of the first guide rods 562, the first guide holes 5611, and the springs 563 are four respectively, the pressing plate 52 and the connecting plate 561 are both rectangular structures, the lower ends of the four first guide rods 562 are fixedly connected to the four corners of the pressing plate 52 respectively, the upper ends of the four first guide rods 562 pass through the first guide holes 5611, and the driving device 53 is connected to the connecting plate 561, which can drive the connecting plate 561 to move up and down under the action of the first guide rods 562. The lower end of the spring 563 is inserted into the sleeve 55, and the upper end of the spring 563 is connected to the bottom of the connecting plate 561. When the spacing between the plate to be tested, the probe 2 and the light source 3 is small or there is no spacing, that is, when performing small spacing detection or no spacing detection, the driving device 53 drives the pressing plate 52 to press down the plate to be tested above the light source 3, which will generate impact force on the plate to be tested, the probe 2 and the light source 3. In this embodiment, a spring 563 is arranged between the sleeve 55 on which the probe 2 is installed and the connecting plate 561. When the driving device 53 drives the connecting plate 561 to press down the spring 563, the spring 563 will generate a buffering force on the sleeve 55 and the pressure plate 52 after being compressed. The buffering force can make the pressure plate 52 play a buffering role after hitting the plate to be tested, thereby reducing the impact force on the plate to be tested, the probe 2 and the light source 3, avoiding hard contact between the probe 2 and the plate to be tested, and protecting the plate to be tested, the probe 2 and the light source 3 from being crushed.

[0052] In this embodiment, the second avoidance hole 5612 is used for the optical fiber 4 to pass through. The optical fiber 4 passes through the second avoidance hole 5612 and the spring 563 to connect with the probe 2, and then the probe 2 is fixed in the sleeve 55 by a fastener.

[0053] Optionally, a plurality of first limiting grooves 5613 are provided at the bottom of the connecting plate 561, and the first limiting grooves 5613 correspond to the second avoidance holes 5612 one by one. The center lines of the second avoidance holes 5612 coincide with those of the first limiting grooves 5613 and pass through the bottom of the first limiting grooves 5613, and the upper end of the spring 563 is inserted into the first limiting groove 5613 and connected to the bottom of the first limiting groove 5613.

[0054] The first limiting groove 5613 serves to limit the spring 563 , thereby preventing the spring 563 from twisting and deforming during the process of being pulled or compressed, thereby preventing the optical fiber 4 from bending too much.

[0055] The upper end of the spring 563 is connected to the bottom of the first limiting groove 5613 , and the connection may be direct abutment, or a hook is provided at the bottom of the first limiting groove 5613 , and the spring 563 is connected to the hook.

[0056] In addition, a second limiting groove 552 can also be set on the inner wall of the sleeve 55 at one end adjacent to the connecting plate 561, and the inner hole 551 of the sleeve 55 passes through the second limiting groove 552. The lower end of the spring 563 abuts against the bottom of the second limiting groove 552 or the lower end of the spring 563 is connected to a hook to fix the hook to the bottom of the second limiting groove 552.

[0057] Furthermore, a stopper 564 is provided at the upper end of the first guide rod 562, and the outer peripheral surface of the stopper 564 protrudes from the outer peripheral surface of the first guide rod 562. A plurality of third stopper grooves 5614 are provided on the upper surface of the connecting plate 561. The stopper 564 matches the third stopper grooves 5614 one by one, and the first guide hole 5611 vertically penetrates the bottom of the third stopper groove 5614. Specifically, the cross-sections of the first guide rod 562 and the stopper 564 are in a T-shaped structure, and correspondingly, the cross-sections of the third stopper grooves 5614 and the first guide hole 5611 are also in a corresponding T-shaped structure. When the driving device 53 drives the connecting plate 561 to rise, the stopper 564 can prevent the first guide rod 562 from being separated from the connecting plate 561.

[0058] The auxiliary tooling 5 also includes an optical fiber insertion plate 57, which is fixed on the connecting plate 561 adjacent to the second avoidance hole 5612, and is provided with a plug hole 571 for the optical fiber 4 to pass through. One end of the optical fiber 4 passes through the second avoidance hole 5612 and the spring 563 to connect with the probe 2, and the other end passes through the plug hole 571 to connect with the LED analyzer 1. The setting of the optical fiber insertion plate 57 can prevent the optical fiber 4 from being damaged due to excessive bending.

[0059] Specifically, the insertion hole 571 can be a long hole that penetrates the optical fiber insertion plate 57 along the thickness direction, or can be a plurality of circular holes corresponding to the number of optical fibers 4.

[0060] The LED analyzer 1 in this embodiment is installed on the mounting base 51 and is located on the side of the optical fiber insertion plate 57 away from the second avoidance hole 5612. After the optical fiber 4 passes through the hole 571 on the optical fiber insertion plate 57, it is directly connected downward to the interface on the LED analyzer 1.

[0061] Furthermore, the auxiliary tooling 5 also includes a second intermediate connecting member 58, which includes a portal frame 581 and a plurality of second guide rods 582. The portal frame 581 is fixed on the mounting seat 51, and the portal frame 581 includes a crossbeam 5811 and two support plates 5812. The two support plates 5812 are fixed on the mounting seat 51 at intervals and are located on both sides of the light source 3. The two ends of the crossbeam 5811 along its length direction are respectively connected to a support plate 5812. The crossbeam 5811 of the portal frame 581 is penetrated by a plurality of second guide holes (not shown in the figure) in the vertical direction. The driving device 53 is installed on the crossbeam 5811 and connected to the connecting plate 561. The lower end of the second guide rod 582 is connected to the connecting plate 561, and the upper end of the second guide rod 582 is plugged into the second guide hole. The driving device 53 can drive the connecting plate 561 to drive the second guide rod 582 to move up and down along the second guide hole.

[0062] The second guide rod 582 is plugged into the second guide hole to guide the driving device 53 to drive the connecting plate 561 to move up and down, so that the connecting plate 561 can move up and down more stably.

[0063] Specifically, the number of the second guide rods 582 and the number of the second guide holes are two respectively, and the four second avoidance holes 5612 are evenly spaced along the length direction of the connecting plate 561 and are located between the two second guide rods 582. In order to further improve the lifting stability of the connecting plate 561, a guide cylinder 583 is installed at the second guide hole on the crossbeam 5811 of the portal frame 581, and an external thread is provided on the outer periphery of the guide cylinder 583 and near its lower end. After the guide cylinder 583 passes through the second guide hole, its lower end protrudes from the lower surface of the crossbeam 5811 and is screwed and fixed with the bolts fixed on the lower surface of the crossbeam 5811, and the upper end of the guide cylinder 583 protrudes from the upper surface of the crossbeam 5811.

[0064] The driving device 53 in this embodiment is as follows: Figure 1 and Figure 7 As shown, it can be a cylinder, specifically including a cylinder body 531 installed on the cross beam 5811 and a piston rod 532 passing through a through hole on the cross beam 5811 and connected to the cylinder body 531, the end of the piston rod 532 away from the cylinder body 531 is fixedly connected to the connecting plate 561, and the connecting plate 561 is driven up and down by the extension and retraction of the piston rod 532.

[0065] Furthermore, the driving device 53 also includes a rod sleeve 533, which is fixed to the bottom of the cross beam 5811. The center line of the rod sleeve 533 coincides with the center line of the piston rod 532. The piston rod 532 is located in the rod sleeve 533. A limiting ring 534 is fixed to the bottom of the rod sleeve 533. The piston rod 532 passes through the limiting ring 534 and is connected to the connecting plate 561. The inner diameter of the limiting ring 534 is slightly larger than the diameter of the piston rod 532 and smaller than the inner diameter of the rod sleeve 533.

[0066] Specifically, the rod sleeve 533 is located between the two second guide rods 582 , and the two second guide rods 582 are symmetrical with respect to the center of the rod sleeve 533 .

[0067] Of course, the driving device 53 of the present invention is not limited to the above-mentioned cylinder structure, and may also be a hydraulic driving structure or a screw motor driving structure, which will not be described in detail.

[0068] In this embodiment, the light source 3 is placed close to the plate to be tested for color temperature testing. To this end, in this embodiment, a mounting groove 511 is provided on the upper surface of the mounting seat 51. Figure 2 The light source 3 is installed in the installation groove 511 , and the upper surface of the light source 3 is not higher than the upper surface of the installation seat 51 .

[0069] In other embodiments, the light source 3 and the plate to be tested may be spaced apart, and the distance between the light source 3 and the plate to be tested may be designed to be an adjustable structure. For example, the depth of the mounting groove 511 may be increased, an articulated lifting frame may be installed in the mounting groove 511, and the light source 3 may be placed on the upper end of the articulated lifting frame, and the height of the light source 3 may be adjusted by telescoping the articulated lifting frame. For another example, multiple pads may be designed, and a suitable number of pads may be placed in the mounting groove 511 according to the distance between the light source 3 and the plate to be tested, and then the plate to be tested may be placed on the pads.

[0070] This embodiment also provides a method for quality control of light-transmitting plates, which uses the color temperature testing system of the above embodiment and includes the following steps:

[0071] Provide standard color temperature, with -(1~3)% and (1~3)% of the standard color temperature as floating space, and use the LED analysis software on the display end to obtain a color coordinate diagram with two color temperature quality control lines. The area between the two color temperature quality control lines is the standard color temperature floating range;

[0072] Provide a plate to be tested, place the plate to be tested on the mounting seat 51 of the auxiliary tooling 5 and cover the light source 3, then turn on the light source 3, drive the pressing plate 52 through the driving device 53 to drive the probe 2 to be pressed down to close to the surface of the plate to be tested; use the LED analyzer 1 to detect the color coordinates of the light source after passing through the plate to be tested; observe the position of the color coordinates in the color coordinate diagram, if the color coordinates are within the standard color temperature floating range, the plate to be tested is qualified, if the color coordinates exceed the standard color temperature floating range, the plate to be tested is unqualified.

[0073] The reasons for failure may be that the thickness of the plate to be tested does not meet the requirements, or the filler is not evenly dispersed, etc.

[0074] In this embodiment, according to the data (color temperature and color coordinates) detected by the LED analyzer 1, the data can be visualized in color coordinates (CIE color coordinate diagram).

[0075] Taking PC sheets of different thicknesses as an example, the LAB value of the PC sheet (reflection mode under a white light source) is detected according to the conventional method, and the x and y coordinates of the white light source passing through the PC sheet (light transmission mode) are detected according to the method of this embodiment, and converted into LAB values. The results are shown in Table 1.

[0076] Table 1. LAB values ​​of PC sheets of different thicknesses in reflection mode and light transmission mode

[0077]

[0078] It can be seen from Table 1 that in the light transmission mode, the LAB values ​​of PC sheets of different thicknesses vary greatly, while in the reflection mode, the LAB values ​​of PC sheets of different thicknesses vary slightly, indicating that the quality control method of this embodiment is more sensitive to the detection of light-transmitting sheets.

[0079] The LAB values ​​of each PC board measured in the reflection mode in Table 1 can be converted into XYZ color coordinates, and then converted into CIE (x, y) color coordinates, and a color coordinate diagram can be made (the conversion method and calculation method are conventional technical means in the field of colorimetry, and the details will not be repeated). Figure 8 In the light transmission mode, the method of this embodiment can be used to directly obtain the CIE (x, y) color coordinates and color temperature, and make a color coordinate diagram, such as Fig. 9 .

[0080] in, Figure 8 This is the color coordinate diagram obtained by converting the LAB values ​​of PC sheets of different thicknesses measured in the reflection mode. Figure 8 The middle gray dot (next to the red dot) is the color coordinate of PC sheets of different thicknesses. The color coordinates of each PC sheet completely overlap, indicating that the thickness difference of the above PC sheets cannot be intuitively reflected in the color coordinate diagram under the reflection mode, that is, the thickness difference between PC sheets cannot be detected under the reflection mode. Fig. 9 The four black dots are the color coordinates of PC sheets of different thicknesses, that is, four thicknesses of PC sheets correspond to four different color coordinates, indicating that the light transmission mode of the present invention can intuitively reflect whether the PC sheet is qualified in the color coordinate diagram, and can distinguish PC sheets of different thicknesses, indicating that the test result accuracy in the light transmission mode is higher than that in the light reflection mode.

[0081] Next, we use 3900K as the standard color temperature, and 3800K and 4000K as the color temperature quality control lines to obtain the standard color temperature floating range. We use LED analyzer 1 to test the color temperature of the PC board to be tested with a thickness of 1.5-2.5mm. The test results are as follows: Fig.10 shown.

[0082] from Fig.10 It can be seen that only some of the test points have color coordinates within the standard color temperature floating range, indicating that the PC board to be tested is unqualified. Some color coordinate points exceed the standard color temperature floating range and are located on the left side of the standard color temperature floating range. They are brighter after light transmission, indicating that the area is relatively thin; some color coordinate points exceed the standard color temperature floating range and are located on the right side of the standard color temperature floating range. They are darker after light transmission, indicating that the area is relatively thick.

[0083] Furthermore, this embodiment can also add a 0.46>y>0.44 quality control line on the basis of the above embodiment. Uneven dispersion of toner will cause small fluctuations in the color coordinate points in the x and y directions. For some color coordinate points far from the qualified area, it means that the thickness and filler dispersion are not qualified. This embodiment can further improve the quality control accuracy by adding a CIE y value quality control line and combining it with the color temperature quality control line.

[0084] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should all be included in the scope of the claims and specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A color temperature test system, comprising a display end, an LED analyzer, a plurality of probes and a light source, wherein the display end is connected to the LED analyzer, and the LED analyzer is connected to the probe via an optical fiber, characterized in that: It also includes auxiliary tooling, which includes a mounting seat, a pressing plate mounted on the mounting seat, and a driving device fixed on the mounting seat and transmission-connected to the pressing plate. The light source is located on the mounting seat, and the probe is fixed on the pressing plate and faces the light source. The driving device can drive the pressing plate to drive the probe to move toward or away from the light source. When the probe moves to a plate to be tested that is close to above the light source, the LED analyzer can detect the color temperature of the light source after passing through the plate to be tested.

2. The color temperature testing system according to claim 1, characterized in that: The pressure plate is provided with a plurality of fixing holes along the vertical direction, and the fixing holes correspond to the probes one by one. An opaque pad is fixed to the bottom of the pressure plate, and the opaque pad is provided with a plurality of first avoidance holes along its thickness direction corresponding to the probes one by one. The detection end of the probe passes through the fixing holes and the first avoidance holes and is flush with the lower surface of the opaque pad.

3. The color temperature testing system according to claim 2, characterized in that: The auxiliary tooling also includes a plurality of sleeves, which correspond to the fixing holes one by one. The sleeves are fixed to the upper surface of the pressure plate, and the center line of the inner hole of the sleeve coincides with the center line of the fixing hole. The probe is fixed in the inner hole of the sleeve by a fastener, and the detection end of the probe passes through the fixing hole and the first avoidance hole and is flush with the lower surface of the opaque cushion.

4. The color temperature testing system according to claim 3, characterized in that: The auxiliary tooling also includes a first intermediate connecting piece, which includes a connecting plate, a plurality of first guide rods and a plurality of springs. The connecting plate is located above the pressure plate and the sleeve. A plurality of first guide holes are opened on the connecting plate. The first guide holes correspond to the first guide rods one by one. The first guide rods are plugged into the first guide holes. There is a gap between the first guide rods and the first guide holes, and the lower end of the first guide rod is fixedly connected to the pressure plate. The connecting plate is connected to the driving device. The connecting plate is penetrated by a plurality of second avoidance holes in the vertical direction. The second avoidance holes and the springs correspond to the sleeves one by one respectively. One end of the spring is inserted into the sleeve, and the other end is connected to the bottom of the connecting plate. The driving device is connected to the connecting plate. The driving device can drive the connecting plate to move up and down. The optical fiber passes through the second avoidance hole and the spring in the vertical direction to be connected to the probe in the sleeve.

5. The color temperature testing system according to claim 4, characterized in that: A plurality of first limiting grooves are provided at the bottom of the connecting plate, and the first limiting grooves correspond to the second avoiding holes one by one. The second avoiding holes coincide with the center lines of the first limiting grooves and pass through the bottom of the first limiting grooves. The upper end of the spring is inserted into the first limiting groove and abuts against the bottom of the first limiting groove.

6. The color temperature test system according to claim 4, characterized in that: A limit block is provided at the upper end of the first guide rod, and the outer circumferential surface of the limit block protrudes from the outer circumferential surface of the first guide rod. A plurality of third limit grooves are provided on the upper surface of the connecting plate, and the limit block matches the third limit grooves one by one, and the first guide hole passes through the bottom of the third limit groove in the vertical direction.

7. The color temperature testing system according to claim 4, characterized in that: The auxiliary tooling also includes an optical fiber insertion plate, which is fixed on the connecting plate adjacent to the second avoidance hole, and the optical fiber insertion plate is provided with a plug hole for the optical fiber to pass through.

8. The color temperature testing system according to claim 4, characterized in that: The auxiliary tooling also includes a second intermediate connecting piece, which includes a portal frame and a plurality of second guide rods. The portal frame is fixed on the mounting seat, and a crossbeam of the portal frame is penetrated by a plurality of second guide holes in the vertical direction. The driving device is installed on the crossbeam and connected to the connecting plate. The lower end of the second guide rod is connected to the connecting plate, and the upper end of the second guide rod is plugged into the second guide hole. The driving device can drive the connecting plate to drive the second guide rod to move up and down along the second guide hole.

9. The color temperature testing system according to any one of claims 1 to 8, characterized in that: The upper surface of the mounting seat is provided with a mounting groove, the light source is mounted in the mounting groove, and the upper surface of the light source is not higher than the upper surface of the mounting seat.

10. A method for quality control of light-transmitting plates, using the color temperature test system according to any one of claims 1 to 9, characterized in that: include: Provide standard color temperature, with -(1~3)% and (1~3)% of the standard color temperature as floating space, and use the LED analysis software on the display end to obtain a color coordinate diagram with two color temperature quality control lines. The area between the two color temperature quality control lines is the standard color temperature floating range; Provide a plate to be tested, place the plate to be tested on the mounting seat of the auxiliary tooling and cover the light source, then turn on the light source, and drive the pressing plate through the driving device to drive the probe to be pressed down until it is close to the surface of the plate to be tested; use the LED analyzer to detect the color coordinates of the light source after passing through the plate to be tested; observe the position of the color coordinates in the color coordinate diagram, if the color coordinates are within the standard color temperature floating range, the plate to be tested is qualified, if the color coordinates exceed the standard color temperature floating range, the plate to be tested is unqualified.

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