EC lens of DMS rearview mirror

Abstract

A DMS rearview mirror EC lens comprises a lens base body, the lens base body is provided with a semi-reflecting and semi-transmitting film layer which enables the reflectivity of a visible light wave band to be larger than 70%, the transmissivity to be between 10% and 20% and the light passing rate of an infrared wave band to be larger than 70%, the semi-reflecting and semi-transmitting film layer comprises N Nb2O5 layers and N SiO2 layers which are sequentially and alternately electroplated, n is a natural number greater than or equal to 10, and a conductive film layer is arranged on the semi-reflecting and semi-transmitting film layer. Compared with the prior art, the lens has the advantages that the lens is provided with the semi-reflecting and semi-transmitting film layer, so that the lens has high reflectivity of visible light, a good reflecting effect and low transmittance of the visible light, and electronic devices such as a PCB (Printed Circuit Board), a camera and the like can be hidden behind the EC lens. And meanwhile, the high transmittance of infrared band optics is ensured, and the shooting of an infrared camera hidden behind can be realized.

Description

TECHNICAL FIELD

[0001] The utility model relates to a kind of automobile rearview mirror technical field, especially a kind of DMS rearview mirror EC lens. BACKGROUND

[0002] DMS equipment is mainly to realize the identity recognition of driver, the detection function of driver fatigue driving and dangerous behavior. It is mainly used to monitor the state of driver, including fatigue monitoring, distraction state monitoring etc. DMS equipment is arranged in automobile rearview mirror, and monitors driver through the lens of automobile rearview mirror.

[0003] The present application discloses a DMS anti-dazzling rearview mirror, which comprises a dimming lens, a shell assembly, a first photosensitive element, a camera module, a main control circuit board, a driver detection module and a warning device. The dimming lens comprises a liquid crystal box and a semi-transparent and semi-reflective mirror film. The dimming lens is arranged on the shell assembly. The first photosensitive element is arranged on the shell assembly. The camera module is arranged in the shell assembly. The main control circuit board is arranged on the shell assembly. The driver detection module is arranged on the main control circuit board and is electrically connected with the main control circuit board. The warning device is arranged on one side of the shell assembly close to the dimming lens. The DMS anti-dazzling rearview mirror can obtain the information of the face, eyeball and posture of the driver through the camera module, and automatically adjust the light transmittance of the liquid crystal box after analysis and processing. The information of the driver fatigue warning and the like is displayed on the warning device. However, the lens structure of the rearview mirror still needs to be improved to achieve high reflectivity, low transmittance and high infrared permeability. SUMMARY

[0004] The utility model provides a kind of DMS rearview mirror EC lens with high visible light emissivity, low transmittance and high infrared permeability, to solve the technical problem of the prior art.

[0005] The technical scheme adopted by the utility model to solve the above technical problems is as follows: the DMS rearview mirror EC lens comprises a lens base body, characterized in that: a semi-reflective and semi-transmissive film layer is arranged on the lens base body, which has a visible light band reflectivity greater than 70%, a transmittance between 10-20%, and an infrared band light transmittance greater than 70%. The semi-reflective and semi-transmissive film layer comprises N layers of Nb2O5 and SiO2 layers that are alternately electroplated, and N is a natural number greater than or equal to 10. A conductive film layer is arranged on the semi-reflective and semi-transmissive film layer.

[0006] As an improvement, N can be a natural number greater than or equal to 10 and less than or equal to 15.

[0007] Further improvement, the SiO2 layer connected with the conductive film layer can be preferably replaced by Si3N4 layer.

[0008] Further improvement, the thickness of the Si3N4 layer can be preferably 0-50nm.

[0009] As an improvement, the conductive film layer can be preferably ITO film layer.

[0010] As an improvement, the thickness of the first Nb2O5 layer connected with the lens base can be preferably 1-100nm.

[0011] Further improvement, the thickness of the first SiO2 layer connected with the first Nb2O5 layer can be preferably 20-200nm.

[0012] Further improvement, the thickness of the second Nb2O5 layer connected with the first SiO2 layer can be preferably 1-120nm.

[0013] Further improvement, the thickness of the second SiO2 layer connected with the second Nb2O5 layer can be preferably 0-150nm.

[0014] Further improvement, the thickness of the third Nb2O5 layer connected with the second SiO2 layer can be preferably 0-120nm.

[0015] Compared with the prior art, the lens is provided with a half-reflection half-transmission film layer, so that the lens has high reflectivity of visible light and low transmittance of visible light, and can hide PCB, camera and other electronic devices behind the EC lens. At the same time, the high transmittance of infrared band optical can be ensured, and the infrared camera hidden behind can be shot. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 is a structural schematic view of the embodiment of the utility model;

[0017] Figure 2 is Figure 1 is a structural schematic view of the utility model applied to the lens;

[0018] Figure 3 is Figure 2 is a perspective view of the utility model applied to the DMS rearview mirror;

[0019] Figure 4 is Figure 3 is a structural exploded view of the utility model;

[0020] Figure 5 is a structural schematic view of the second embodiment of the utility model. DETAILED DESCRIPTION

[0021] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0022] like Figures 1 to 4 As shown, the DMS rearview mirror EC lens of this embodiment includes a lens substrate 10. A semi-reflective and semi-transparent film layer is disposed on the lens substrate 10, which has a visible light reflectivity greater than 70%, a transmittance between 10 and 20%, and an infrared light transmittance greater than 70%. The semi-reflective and semi-transparent film layer includes N alternatingly electroplated Nb₂O₅ layers 11 and SiO₂ layers 12, where N is a natural number greater than or equal to 10. A conductive film layer 14 is disposed on the semi-reflective and semi-transparent film layer. N can be further limited to a natural number greater than or equal to 10 and less than or equal to 15. The conductive film layer 14 is an ITO film layer. The thickness of the first Nb₂O₅ layer connected to the lens substrate 10 is 1–100 nm. The thickness of the first SiO₂ layer connected to the first Nb₂O₅ layer is 20–200 nm. The thickness of the second Nb₂O₅ layer connected to the first SiO₂ layer is 1–120 nm. The thickness of the second SiO2 layer connected to the second Nb2O5 layer is 0–150 nm. The thickness of the third Nb2O5 layer connected to the second SiO2 layer is 0–120 nm.

[0023] The DMS rearview mirror EC lens is installed in the DMS rearview mirror. The DMS rearview mirror includes a housing 3, a positioning plate 32, a control circuit board 4, a photosensitive element 5, and a lens 1. The positioning plate 32 is installed in the housing 3, and the lens 1 is installed on the positioning plate 32. The control circuit board 4 is installed in the cavity of the housing formed by the positioning plate 32 and the housing 3. A driver detection module 41 is installed on the control circuit board 4. The circuit of the control circuit board 4 is connected to the camera module 42 through wiring. The specific circuit structures of the control circuit 4, the driver detection module 41, and the camera module 42 are all prior art and will not be described in detail. The opening cover of the housing 3 has a limiting cover 31, which locks the lens 1. The control circuit board 4 is connected to the photosensitive element 5 through wiring. The specific structure of the photosensitive element 5 is known technology and will not be described in detail.

[0024] Lens 1 includes a light-transmitting lens 102 and a reflective lens 101, which are fixed together by an annular sealant 2. The cavity is filled with an electrochromic liquid 6. Conductive films are provided on the front surface of the reflective lens 101 and the rear surface of the light-transmitting lens 102. Electrodes 7 are provided at both the upper and lower ends of lens 1, and the electrodes 7 are connected to the control circuit board 4 through circuits.

[0025] like Figure 5As shown, the DMS rearview mirror EC lens of the second embodiment comprises a lens substrate 10, a semi-reflective and semi-transmissive film layer is arranged on the lens substrate 10, the semi-reflective and semi-transmissive film layer has a visible light band reflectivity greater than 70%, a transmittance between 10% and 20%, and an infrared light band light transmittance greater than 70%, the semi-reflective and semi-transmissive film layer comprises N layers of Nb2O5 layers 11 and SiO2 layers 12 which are alternately and sequentially electroplated, N is a natural number greater than or equal to 10, and a conductive film layer 14 is arranged on the semi-reflective and semi-transmissive film layer. N can be further limited to a natural number greater than or equal to 10 and less than or equal to 15. The conductive film layer 14 is an ITO film layer. The thickness of the first Nb2O5 layer connected with the lens substrate 10 is 1-100 nm. The thickness of the first SiO2 layer connected with the first Nb2O5 layer is 20-200 nm. The thickness of the second Nb2O5 layer connected with the first SiO2 layer is 1-120 nm. The thickness of the second SiO2 layer connected with the second Nb2O5 layer is 0-150 nm. The thickness of the third Nb2O5 layer connected with the second SiO2 layer is 0-120 nm. The SiO2 layer 12 connected with the conductive film layer 14 is replaced by a Si3N4 layer 13. The thickness of the Si3N4 layer 13 is 0-50 nm.

[0026] The DMS rearview mirror EC lens is arranged in a DMS rearview mirror, the DMS rearview mirror comprises a shell 3, a positioning plate 32, a control circuit board 4, a photosensitive element 5, and a lens 1, the positioning plate 32 is arranged in the shell 3, the lens 1 is arranged on the positioning plate 32, and the control circuit board 4 is arranged in a shell inner cavity surrounded by the positioning plate 32 and the shell 3. A driver detection module 41 is arranged on the control circuit board 4, and the circuit of the control circuit board 4 is connected with a camera module 42 through a line. The specific circuit structures of the control circuit 4, the driver detection module 41, and the camera module 42 all belong to the prior art, and thus will not be described in detail. The opening cover of the shell 3 is a limiting cover 31, and the limiting cover 31 clamps the lens 1. The control circuit board 4 is connected with the photosensitive element 5 through a line, and the specific structure of the photosensitive element 5 belongs to the known art, and thus will not be described in detail.

[0027] The lens 1 comprises a light-transmitting lens 102 and a reflective lens 101, the two lenses are fixed through a ring-shaped sealing glue 2, and an electrochromic liquid 6 is filled in a cavity. A conductive film is arranged on the front surface of the reflective lens 101 and the rear surface of the light-transmitting lens 102, electrodes 7 are arranged on the upper and lower ends of the lens 1, and the electrodes 7 are connected with the control circuit board 4 through a line.

[0028] The following table is an optical analysis of the lens of the DMS rearview mirror, detecting the reflectivity and transmittance of the lens, wherein the upper piece refers to the light-transmitting lens, and the lower piece refers to the reflecting lens, that is, the corresponding lens of the utility model. It can be seen that the present lens is provided with a semi-reflective and semi-transmissive film layer, so that the present lens simultaneously has high reflectivity of visible light, can achieve good reflection effect, low transmittance of visible light, and can hide electronic devices such as PCB and camera behind the EC lens. At the same time, the high transmittance of infrared band optical is ensured, and the shooting of the infrared camera hidden behind can be realized.

[0029]

[0030]

[0031]

[0032]

[0033]

[0034]

Claims

1. A DMS rearview mirror EC lens, comprising a lens substrate (10), characterized in that: A semi-reflective and semi-transparent film layer is provided on the lens substrate (10), which can make the reflectivity of visible light band greater than 70%, the transmittance between 10 and 20%, and the transmittance of infrared light band greater than 70%. The semi-reflective and semi-transparent film layer includes N layers of Nb2O5 layer (11) and SiO2 layer (12) that are alternately electroplated in sequence, where N is a natural number greater than or equal to 10. A conductive film layer (14) is provided on the semi-reflective and semi-transparent film layer.

2. The DMS rearview mirror EC lens according to claim 1, characterized in that: N is a natural number greater than or equal to 10 and less than or equal to 15.

3. The DMS rearview mirror EC lens according to claim 2, characterized in that: The SiO2 layer (12) connected to the conductive film layer (14) is replaced with a Si3N4 layer (13).

4. The DMS rearview mirror EC lens according to claim 3, characterized in that: The thickness of the Si3N4 layer (13) is 0-50 nm.

5. The DMS rearview mirror EC lens according to any one of claims 1 to 4, characterized in that: The conductive film layer (14) is an ITO film layer.

6. The DMS rearview mirror EC lens according to any one of claims 1 to 4, characterized in that: The thickness of the first Nb2O5 layer connected to the lens substrate (10) is 1 to 100 nm.

7. The DMS rearview mirror EC lens according to claim 6, characterized in that: The thickness of the first SiO2 layer connected to the first Nb2O5 layer is 20–200 nm.

8. The DMS rearview mirror EC lens according to claim 7, characterized in that: The thickness of the second Nb2O5 layer connected to the first SiO2 layer is 1–120 nm.

9. The DMS rearview mirror EC lens according to claim 8, characterized in that: The thickness of the second SiO2 layer connected to the second Nb2O5 layer is 0–150 nm.

10. The DMS rearview mirror EC lens according to claim 9, characterized in that: The thickness of the third Nb2O5 layer, which is connected to the second SiO2 layer, is 0–120 nm.

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