Manufacturing method of high-hardness narrow-band infrared transmission DMS window

Abstract

The invention relates to the technical field of high-hardness narrow-band infrared transmission DMS windows, in particular to a manufacturing method of a high-hardness narrow-band infrared transmission DMS window, which comprises the following steps: drying PMMA (polymethyl methacrylate), uniformly mixing the dried PMMA and Luminate TML7276B, heating and drying, finally injecting the heated and dried mixture into a preheated mold, and cooling and molding to obtain the DMS window. The influence of external environment light change on the performance of the sensor (such as sunlight reflection, in-vehicle light and the like) can be avoided, it is ensured that the sensor can work stably under various illumination conditions, infrared light close to the infrared band is relatively transparent to visible light, and the infrared sensor can be better utilized to work in a dark or low-light environment. The closer the infrared band is to the infrared light area, the closer the infrared band is to, the driver can better penetrate through the skin, eyes and other parts of the driver in a low-light environment, and it is ensured that the system can capture the dynamic states of the face and eyes of the driver in real time, so that whether the driver is in a fatigue, distraction or unsafe state or not is accurately judged.

Description

Technical Field

[0001] The present invention relates to the technical field of high-hardness narrow-band infrared-transmitting DMS windows, and in particular to a method for manufacturing a high-hardness narrow-band infrared-transmitting DMS window. Background Art

[0002] At present, DMS windows on the market usually use infrared-transmitting PC material windows. DMS windows made in this way begin to transmit infrared in the 700nm band, and the driver is easily attracted by the transmitted infrared light, causing the risk of distraction; and the hardness is low (6B), not scratch-resistant, and the surface is easily weathered and scratched, causing surface damage, which will cause deviations in the work of the infrared camera and affect the data calculation of the background computer. Therefore, we provide a method for making a high-hardness narrow-band infrared-transmitting DMS window, which can shield the luminous optical devices in the DMS machine and the visible light transmittance in the band below 780nm, and will not cause the problem of internal optical device light reflection inside, solving the current low hardness of the DMS window. The hardness can reach HB, and its narrow-band characteristics can reduce the light leakage caused by near-infrared light. Summary of the invention

[0003] The purpose of the present invention is to provide a method for manufacturing a high-hardness narrow-band infrared-transmitting DMS window to improve the reliability and accuracy of the DMS system.

[0004] In order to achieve the above objectives, the present invention adopts the following technical solutions:

[0005] The present invention proposes a method for manufacturing a high-hardness narrow-band infrared-transmitting DMS window, wherein PMMA is first dried, and then the dried PMMA and Luminate are mixed. TM L7276B is mixed evenly and heated and dried, and finally the heated and dried mixture is injected into a preheated mold, and the DMS window is obtained after cooling and molding.

[0006] Further PMMA and Luminate TM The ratio of L7276B is 410:1.

[0007] Furthermore, the PMMA is dried at 60° C. to 80° C. for more than 4 hours.

[0008] Furthermore, the temperature of the heating and drying is 110°C to 120°C.

[0009] Furthermore, the preheated mold temperature is 100°C to 110°C.

[0010] The mixing is further performed by mechanical stirring or mixing in a high shear mixer.

[0011] The beneficial effects of the present invention are: the influence of changes in external ambient light on sensor performance (such as sunlight reflection, interior lighting, etc.) can be avoided, ensuring stable operation under various lighting conditions. Infrared light close to the infrared band is relatively transparent to visible light, and infrared sensors can be better used to work in dark or low-light environments. The closer the infrared band is to the infrared light zone, the better it can penetrate the driver's skin, eyes, etc. in low-light environments, ensuring that the system can capture the driver's facial and eye dynamics in real time, thereby accurately judging whether he is tired, distracted, or in an unsafe state. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 This is the infrared spectrum data diagram of the DMS window prepared in Example 2. DETAILED DESCRIPTION

[0013] The present invention will be further described below in conjunction with the accompanying drawings.

[0014] See also Figure 1 , the present invention provides an embodiment:

[0015] Example 1

[0016] Prepare a high-hardness narrow-band infrared-transmitting DMS window according to the following steps:

[0017] First, dry PMMA at 60℃~80℃ for more than 4 hours, then mix the dried PMMA and Luminate TM L7276B is mixed evenly in a ratio of 410:1 and heated and dried at a temperature of 110°C to 120°C. Finally, the heated and dried mixture is injected into a mold preheated to 100°C to 110°C, and the DMS window is obtained after cooling and molding.

[0018] The DMS window prepared in Example 1 has a black visual effect, can shield the luminous optical devices in the DMS machine, and can shield the visible light transmittance in the band below 780nm, will not cause the problem of internal reflection of light from the internal optical devices, and at the same time, the average transmittance in the working band of 800-1100nm can reach 86%; the low hardness of the current DMS window is solved, the hardness can reach HB, and its narrow band characteristics can reduce the light leakage caused by near-infrared light.

[0019] Example 2: PMMA was first dried in a drying oven at 70°C for 5 hours, and then the dried PMMA and Luminate TM L7276B is mixed in a ratio of 410:1 by mechanical stirring or in a high shear mixer and then heated and dried at a temperature of 115°C. Finally, the heated and dried mixture is injected into a mold preheated to 105°C, and the DMS window is obtained after cooling and molding.

[0020] Table 1 below shows the transmittance of the DMS window obtained in Example 2 at 380-1099 nm working wave. The transmittance of the DMS window obtained in Example 2 is shown in Table 1 and Figure 1 .

[0021] Table 1

[0022]

[0023]

[0024]

[0025]

[0026]

[0027]

Claims

1. A method for manufacturing a high-hardness narrow-band infrared-transmitting DMS window, characterized in that: First, dry the PMMA, then mix the dried PMMA and Luminate TM L7276B is mixed evenly and heated and dried, and finally the heated and dried mixture is injected into a preheated mold, and the DMS window is obtained after cooling and molding.

2. The method for manufacturing a high-hardness narrow-band infrared-transmitting DMS window according to claim 1, characterized in that: PMMA and Luminate TM The ratio of L7276B is 410:

1.

3. The method for manufacturing a high-hardness narrow-band infrared-transmitting DMS window according to claim 1, characterized in that: The PMMA is dried at 60° C. to 80° C. for more than 4 hours.

4. The method for manufacturing a high-hardness narrow-band infrared-transmitting DMS window according to claim 1, characterized in that: The temperature of the heating and drying is 110°C to 120°C.

5. The method for manufacturing a high-hardness narrow-band infrared-transmitting DMS window according to claim 1, characterized in that: The preheated mold temperature is 100°C to 110°C.

6. The method for manufacturing a high-hardness narrow-band infrared-transmitting DMS window according to claim 1, characterized in that: The mixing is performed by mechanical stirring or mixing in a high shear mixer.

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