Large size smart touch device

Abstract

The present invention discloses a large-size intelligent touch device, comprising a host control module (1) and a device body (2) connected to each other, wherein the device body (2) is an interactive electronic whiteboard, a projection television or an LCD all-in-one machine, and the host control module (1) comprises a charger power supply or a PC adapter (11) and a PC mainboard (13), wherein the output end of the PC mainboard (13) is connected to an infrared touch module (3), and the charger power supply or the PC adapter (11) is connected to the input end of the PC mainboard (13) via a rechargeable battery (12). The device can improve the intelligence of products and the flexibility of matching, avoid product system damage and file loss due to sudden power failure of products, reduce maintenance costs and transformation costs, and benefit more people.

Description

Technical Field

[0001] The invention relates to a large-size intelligent touch-control device. Background Art

[0002] Large-size smart touch products such as interactive electronic whiteboards, projection TVs and LCD all-in-ones combine the advantages of modern computer technology, Internet information, multimedia resources and professional software. They can vividly demonstrate text, pictures, video interaction and touch operations, etc., and are widely used in school education, office, exhibition, network interaction, home theater, etc. However, they may encounter problems such as power outages and data loss during use. Summary of the invention

[0003] The purpose of the present invention is to provide a large-size smart touch device that reduces the safety hazards caused by messy external lines, improves product intelligence and flexibility in matching, avoids product system damage and file loss due to sudden power failure of the product, reduces maintenance costs and modification costs, and can benefit more users.

[0004] To achieve the above-mentioned purpose, the present invention provides the following technical solution: a large-size intelligent touch device, comprising a host control module and a device body connected to each other, wherein the device body is an interactive electronic whiteboard, a projection TV or an LCD all-in-one machine, the host control module comprises a charger power supply or a PC adapter, and a PC motherboard, the output end of the PC motherboard is connected to an infrared touch module, and the charger power supply or the PC adapter is connected to the input end of the PC motherboard through a rechargeable battery.

[0005] The beneficial effect of the large-size intelligent touch device of the present invention is that when a sudden power outage occurs during the use of the product, the rechargeable battery can provide emergency power supply for the PC motherboard, and the product system will not be damaged or files will not be lost due to the sudden power outage of the product.

[0006] As a further improvement of the present invention, the rechargeable battery includes a battery charging control and protection circuit and a battery cell group; the battery charging control and protection circuit includes a battery control circuit, and a constant current and constant voltage control circuit, a DC voltage stabilizing circuit, a voltage control circuit, a current control circuit, a temperature detection circuit for detecting the battery temperature, a battery charging detection circuit, an overcharge and over-discharge protection circuit, an overcurrent / short circuit detection circuit, and a charging state indication circuit respectively connected to the battery control circuit; the charger power supply or PC adapter is respectively connected to the constant current and constant voltage control circuit and the DC voltage stabilizing circuit; the battery cell group is respectively connected to the voltage control circuit, the current control circuit, the temperature detection circuit, the battery charging detection circuit, the overcharge and over-discharge protection circuit, and the overcurrent / short circuit detection circuit. The battery charging control and protection circuit is used to control the charging and discharging of the battery cell. When the battery cell is under-powered, the battery cell is charged, and when the battery cell is fully charged, the charging is cut off. The battery charging control and protection circuit is provided with overcharge, over-discharge, overcurrent / short circuit, temperature, protection / detection circuit, and voltage stabilizing circuit. If an abnormality is encountered, the charging can be immediately cut off.

[0007] Preferably, the battery control circuit adopts bq2057 chip.

[0008] As a further improvement of the present invention, a WiFi wireless transmission screen device is also provided in the chassis of the host control module, and the WiFi wireless transmission screen device has a printed antenna, and the patch of the printed antenna is attached to the side of the chassis, and the WiFi wireless transmission screen device is connected to the PC motherboard through a data cable. The patch can be square, and the back of the patch is attached with adhesive. When in use, it is preferably adhered to the side of the shell of the host control module. In order to cope with the influence of the weak penetration ability of high frequencies such as 5G, the WiFi-screen device transmits electrical signals to the PC motherboard through a data cable, realizing high-quality screen transmission and remote operation with peripheral mobile phones, computers, PADs and other electronic products.

[0009] As a further improvement of the present invention, the channel wire of the printed antenna adopts RG316 or RG178 coaxial cable, and the length of the printed antenna does not exceed 1m. In order to cope with the influence of the weak penetration of high frequencies such as 5G, RG316 or RG178 coaxial cable has strong shielding and low internal resistance, and the length of the printed antenna does not exceed 1m.

[0010] The same-screen effect can be guaranteed.

[0011] As a further improvement of the present invention, the PC mainboard has its own mainboard port, the host control module is connected to an integrated HUB port connected to the PC mainboard, and the integrated HUB port is connected to the infrared touch module of the device body and the HDMI interface of the projection instrument through a data cable. Information such as text, pictures, touch operation, etc. is projected on the panel of the product body to realize intelligent interaction.

[0012] As a further improvement of the present invention, a "concave" wire groove is provided in front of each data line interface of the integrated HUB port, and a buckled protective cover is provided on the top. The protective cover can be set in a rectangular shape, and the protective cover can reduce dust, prevent loosening, and increase the product line and aesthetics.

[0013] Preferably, the frame of the device body is divided into an upper seat and a back cover. The upper seat is fixed around the panel of the device body. The back of the upper seat has an upper seat wire groove, and the inner side of the back cover is provided with a wing-shaped card slot that matches the upper seat wire groove. The upper seat wire groove is used to place the touch motherboard and data cable of the infrared touch module. The profile of the upper seat can be flexibly cut to length according to product size requirements. The inner side of the back cover is designed according to the outer size of the back of the upper seat and the size of the wire groove position to match the upper outer frame, which can store and protect the circuit and facilitate frame assembly and product maintenance.

[0014] As a further improvement of the present invention, the four corners of the frame are covered with plastic corner sleeves, and the plastic corner sleeves are detachably connected to the frame. The plastic corner sleeves are used to protect the frame, and screw fisheye holes can be opened on the back of the plastic corner sleeves in a detachable manner for locking the countersunk screws.

[0015] As a further improvement of the present invention, a composite reflective strip is attached to the inner side of the frame, and the reflective surface of the composite reflective strip is serrated. The light reflection principle is used to change the advancing direction of light through the prism surface, so that the incident light is fully reflected on the interface or the original reflection angle is reduced, thereby improving the reflection effect.

[0016] As a further improvement of the present invention, the reflective surface of the composite reflective strip is covered with a layer of metal reflective film. The metal reflective film has a high surface density and can increase the reflection of light.

[0017] Preferably, the "V"-shaped notch groove of the reflective surface of the composite reflective strip faces the opposite frame, and the "V"-shaped notch groove of the reflective surface of the composite reflective strip is filled with light-transmitting glue, and a planar light-transmitting protective layer is bonded by the light-transmitting glue. By adhering a light-projecting protective layer such as PET on the surface and filling the notch of the composite reflective strip with light-transmitting glue, the touch problem caused by the decrease in the reflected energy of light due to reflection damage can be protected, and the problem of low reflection energy of 2D reflective strips at the corners of products is solved. Currently, 3D reflective strips are used on the market. Although 3D reflective strips can improve the problem of low reflection energy at the corners of products, dust can easily fall into the "V"-shaped groove of the 3D reflective strip, which is difficult to remove and causes the 3D reflective strip to be unable to be used in large-size interactive electronic whiteboards and other large-size smart touch products in batches. The use of light-transmitting glue and light-transmitting protective layer can solve this problem.

[0018] Preferably, the "V"-shaped notch groove of the reflective surface of the composite reflective strip faces the frame and is bonded to the frame, and the back of the "V"-shaped notch is covered with a light-transmitting protective layer. In addition to dispensing glue in the "V"-shaped groove, in order to reduce costs, the composite reflective strip can also be turned upside down to adjust the reflection angle and energy through the structure and the density of the incident material.

[0019] Preferably, the infrared touch module is arranged on the frame, and the touch mainboard of the infrared touch module is connected with two or four infrared cameras, and the two infrared cameras are arranged at two adjacent corners of the frame, and each infrared camera is installed at the corner of the frame through a base, and an "L"-shaped right-angle notch is arranged on the base, and the infrared camera lens is located on the right-angle bisector of the "L"-shaped right-angle notch. It is convenient for components to be quickly and accurately installed at the right angles of large-size smart touch products to avoid touch blind areas and image interference on the side of the frame caused by the angle offset of the camera. Each pair of infrared cameras can only be installed at the upper / lower corners of the same left / right frame, or the left / right corners of the same upper / lower frame. Each product can be equipped with up to two pairs, i.e., 4 infrared cameras, but the A and B ends of the same pair of cameras cannot be installed at the opposite corners of the product.

[0020] As a further improvement of the present invention, the infrared touch module is installed on the wide side of the device body, and a transparent cover plate is installed on the inner side wall of the wide side of the frame. This is used to solve the problem of the upper touch blind area of ​​infrared touch series products, and the transparent cover plate further protects the infrared touch module camera to avoid board scratches and contamination, resulting in touch failure and reduced sensitivity.

[0021] As a further improvement of the present invention, the inner side of the light-transmitting cover plate is plated with an infrared anti-reflection film, and the wavelength range is 760-960nm, so as to increase the light transmission efficiency of the infrared touch module camera.

[0022] As a further improvement of the present invention, a filter film is plated on the outside of the light-transmitting cover plate, and the filter light is 400-600nm, which is used to filter the interference of purple, blue, green and yellow light in the external visible light on the induced image of the infrared camera. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 Schematic diagram of the connection in this embodiment;

[0024] Figure 2 This is a schematic diagram of the connection between the host control module and the device body in this embodiment;

[0025] Figure 3 This is a schematic diagram of the structure of the back side of the plastic corner sleeve in this embodiment;

[0026] Figure 4 This is a schematic structural diagram of the side surface of the plastic corner sleeve in this embodiment;

[0027] Figure 5 This is a schematic diagram of the structure of the composite reflective strip in this embodiment when it is placed upright;

[0028] Figure 6 This is a schematic diagram of the structure of the composite reflective strip in this embodiment when it is inverted;

[0029] Figure 7 Schematic diagram of the structure of the frame in this embodiment;

[0030] Figure 8 4 states of the infrared camera installation in this embodiment;

[0031] Fig. 9 4-state diagram of the projector installation in this embodiment;

[0032] Fig.10 This is a structural diagram of the present embodiment when used. DETAILED DESCRIPTION

[0033] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. 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 ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0034] like Figure 1 As shown in Figure 7, this embodiment provides a large-size intelligent touch device, including a host control module 1 and a device body 2 that are connected to each other. The device body 2 is an interactive electronic whiteboard, a projection TV or an LCD all-in-one machine. The host control module 1 includes a charger power supply or a PC adapter 11 and a PC motherboard 13. The output end of the PC motherboard 13 is connected to the infrared touch module 3, and the charger power supply or the PC adapter 11 is connected to the input end of the PC motherboard 13 through a rechargeable battery 12.

[0035] The rechargeable battery 12 in this embodiment includes a battery charging control and protection circuit 121 and a battery cell group 122;

[0036] The battery charging control and protection circuit 121 includes a battery control circuit 121a, and a constant current and constant voltage control circuit 121b, a DC voltage stabilizing circuit 121c, a voltage control circuit 121d, a current control circuit 121e, a temperature detection circuit 121f for detecting the battery temperature, a battery charging detection circuit 121g, an overcharge and over-discharge protection circuit 121h, an overcurrent / short circuit detection circuit 121i, and a charging status indication circuit 121j, which are respectively connected to the battery control circuit 121a. The charger power supply or PC adapter 11 is respectively connected to the constant current and constant voltage control circuit 121b and the DC voltage stabilizing circuit 121c, and the battery cell group 122 is respectively connected to the voltage control circuit 121d, the current control circuit 121e, the temperature detection circuit 121f, the battery charging detection circuit 121g, the overcharge and over-discharge protection circuit 121h, and the overcurrent / short circuit detection circuit 121i. The battery charging control and protection circuit 121 is used to control the charging and discharging of the battery pack 122. When the battery pack 122 is underpowered, the battery pack 122 is charged. When the battery pack 122 is fully charged, the charging is cut off. The battery charging control and protection circuit 121 is provided with overcharge, temperature, overcurrent and overdischarge protection circuits and voltage stabilization circuits. If an abnormality is encountered, the charging can be immediately cut off. When a sudden power outage occurs during the use of the product, the rechargeable battery 12 can provide emergency power supply for the PC motherboard 13, and the product system will not be damaged or files will not be lost due to a sudden power outage of the product.

[0037] A WiFi wireless transmission screen-splitting device 14 is also provided in the chassis of the host control module 1. The WiFi wireless transmission screen-splitting device 14 has a printed antenna 141. The patch of the printed antenna 141 is attached to the side of the chassis. The WiFi wireless transmission screen-splitting device 14 is connected to the PC motherboard 13 via a data cable. The WiFi wireless transmission screen-splitting device 14 uses a printed antenna 141 with a patch. The patch is square and has adhesive on the back. When in use, it is preferably adhered to the side of the chassis of the host control module 1. In order to cope with the influence of the weak penetration of high frequencies such as 5G, the channel wire of the patch antenna 141 uses RG316 or RG178 coaxial cable, and the length of the printed antenna 141 does not exceed 1m to ensure the screen-splitting effect. The WiFi-screen-splitting device 14 transmits electrical signals to the PC 13 via a data cable.

[0038] The PC motherboard 13 has a built-in motherboard port 131. In addition to the built-in motherboard port 131, the host control module 1 is connected to an integrated HUB port 132 connected to the PC motherboard 13. The integrated HUB port 132 may include a VGA interface, an HDMI high-definition interface, a USB2.0 interface, a USB3.0 interface, a network interface, etc. The integrated HUB port 132 is connected to the infrared touch module 3 of the device body 2 and the HDMI interface of the projection instrument 4 through a data cable. A "concave" wire groove is opened in front of each data line interface of the integrated HUB port 132, and a buckled protective cover is provided on the top. It can reduce dust, prevent loosening, and increase product lines and aesthetics.

[0039] The frame 22 of the device body 2 is divided into an upper seat 221 and a back cover 222. The upper seat 221 is fixed around the panel 21 of the device body 2. The upper seat 221 is a hollow profile, and there is an upper seat wire groove on the back thereof, which is used to place the touch motherboard and data cable of the infrared touch module. The profile of the upper seat can be flexibly cut to length according to product size requirements, and the inner side of the back cover 222 is a wing-shaped card slot that matches the outer size of the back of the upper seat 221 and the size of the upper seat wire groove. It can store and protect the circuit, and facilitate frame assembly and product maintenance.

[0040] The four corners of the frame 22 are covered with plastic corner sleeves 23, and the plastic corner sleeves 23 are detachably connected to the frame 22. The detachable manner can be: the back of the plastic corner sleeve 23 is provided with screw fisheye holes for locking the countersunk screws.

[0041] A composite reflective strip 24 is attached to the inner side of the frame 22. The reflective surface of the composite reflective strip 24 is in a sawtooth shape (a plurality of interconnected home plate shapes), and the reflective surface of the composite reflective strip 24 is covered with a metal reflective film 24b. The "V"-shaped notch groove of the reflective surface of the composite reflective strip 24 faces the frame 22 opposite to it. The "V"-shaped notch groove of the reflective surface of the composite reflective strip 24 is filled with a light-transmitting adhesive 24a, and a planar light-transmitting protective layer 24c is bonded by the light-transmitting adhesive 24a. The "V"-shaped notch groove of the reflective surface of the composite reflective strip 24 faces the frame 22, and the back of the "V"-shaped notch is covered with a light-transmitting protective layer 24c.

[0042] The infrared touch module 3 is arranged on the frame 22, specifically, it is fixed in the hollow groove of the hollow profile of the upper seat (221) of the frame. The touch mainboard 31 of the infrared touch module 3 is connected to two or four infrared cameras 32. The two infrared cameras 32 are arranged at two adjacent corners of the frame 22. Each infrared camera 32 is installed at the corner of the frame 22 through a base. The base is provided with an "L"-shaped right-angle notch. The infrared camera 32 lens is located on the right-angle bisector of the "L"-shaped right-angle notch. It is convenient for components to be quickly and accurately installed at the right angles of large-sized smart touch products to avoid touch blind spots and image interference on the side of the frame caused by the angle offset of the camera. As mentioned above, there is an "L"-shaped right-angle notch directly below the base of the infrared camera 32, so it is convenient to carry out intelligent and simple transformation of existing facilities such as blackboards, advertising walls and ordinary whiteboards (such as Fig.10 As shown in the figure, it is only necessary to open a wire trough or fix an ordinary wire box on the wall, put the touch motherboard 31 of the infrared touch module into the wire trough or wire box, fix the infrared camera 32 on the corner of the modified product as required, and use the infrared touch triangulation algorithm to obtain touch information. A matte PET projection film is pasted on the front of the device body 2 (such as a blackboard or an advertising wall). Then connect the data cable of the touch motherboard 31 to the computer and the host control module 1, and connect the HDMI cable of the projector 4 to the computer and the host control module 1, so as to realize intelligent human-computer interaction and touch writing.

[0043] The center of the optical axis of the infrared LED of the infrared camera 32 faces the diagonal of the device body 2, which can enhance the light energy of the corners of the device body 2 and improve the overall touch sensitivity of the large-size device body 2: according to the aspect ratio of the device body 2, the center of the optical axis of the infrared LED of the infrared camera 32 faces the farthest position of the diagonal of the device body 2 (Note that the infrared camera 32 faces 45 degrees on the right angle bisector, and the device body 2 is generally a rectangle based on the audience's perspective, so the right angle diagonal is usually not equal to the right angle bisector, such as the conventional length ratio of 4:3, 16:9, 16:10, 16:6, etc.). To maximize the light effect. Users do not need to invest too much cost to enjoy the viewing angle of large-size full touch. And the projection method can be flexibly changed.

[0044] like Figure 8 As shown, each pair of infrared cameras 32 can only be installed at the upper and lower corners of the same left / right frame, or the left and right corners of the same upper / lower frame. Each device body 2 can be equipped with up to two pairs, i.e., four infrared cameras 32, but the same pair of cameras (two infrared cameras 32) cannot be installed at the opposite corners of the device body 2.

[0045] The infrared touch module 3 is installed on the wide side of the device body 2, and a transparent cover plate 25 is installed on the inner side wall of the wide side of the frame 22. It is used to solve the problem of blind spot of the upper touch of infrared touch products, and further protect the infrared camera 32 through the transparent cover plate 25 to avoid scratches and contamination of the board, which may cause touch failure and reduced sensitivity. (such as Figure 2 / Schematic diagram of the structure of the example)

[0046] In order to further enhance the function of the transparent cover plate 25, an infrared anti-reflection film is plated on the inner side of the transparent cover plate 25, and its wavelength is 760-960nm. It is used to increase the light transmission efficiency of the infrared touch module camera 32. A filter film is plated on the outer side of the transparent cover plate 25, and its filtering range is 400-600nm. It is used to filter the purple, blue, green and yellow light in the external visible light irradiation to interfere with the sensing image in the infrared camera.

[0047] like Fig. 9 As shown, at least one projector 4 is installed above or below the device body 2 of the present application, preferably placed above the device body 2 to reduce the obstruction of the projected image by the human body or tools during touch control. When the operator uses it, it is connected to an external electronic product through the motherboard port 131 of the PC motherboard 13, and can also be transmitted and remotely operated through the WiFi wireless transmission screen device 14 of the host control module 1, and is connected to the infrared touch module 3 and the projector 4 installed in the upper frame of the device body 2 through the data line of the integrated HUB port 132 connected to the PC motherboard 13, respectively, to project text, pictures, touch operation and other information on the panel of the device body 2 to achieve intelligent interaction.

[0048] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A large-size intelligent touch device, comprising a host control module (1) and a device body (2) connected to each other, wherein the device body (2) is an interactive electronic whiteboard, a projection TV or an LCD all-in-one machine, the host control module (1) comprises a charger power supply or a PC adapter (11), a PC mainboard (13), and the output end of the PC mainboard (13) is connected to an infrared touch module (3), characterized in that : The charger power supply or PC adapter (11) is connected to the input terminal of the PC mainboard (13) via the rechargeable battery (12); The rechargeable battery (12) comprises a battery charging control and protection circuit (121) and a battery cell group (122); the battery charging control and protection circuit (121) comprises a battery control circuit (121a), and a constant current and constant voltage control circuit (121b), a DC voltage stabilizing circuit (121c), a voltage control circuit (121d), a current control circuit (121e), a temperature detection circuit (121f) for detecting battery temperature, a battery charging detection circuit (121g), and an overcharge and overdischarge protection circuit respectively connected to the battery control circuit (121a). (121h), an overcurrent / short circuit detection circuit (121i), and a charging state indication circuit (121j); the charger power supply or PC adapter (11) is respectively connected to a constant current and constant voltage control circuit (121b) and a DC voltage stabilization circuit (121c); and the battery cell group (122) is respectively connected to a voltage control circuit (121d), a current control circuit (121e), a temperature detection circuit (121f), a battery charging detection circuit (121g), an overcharge and overdischarge protection circuit (121h), and an overcurrent / short circuit detection circuit (121i); The frame (22) of the device body (2) is divided into an upper seat (221) and a back cover (222); the upper seat (221) is fixed on the four sides of the panel (21) of the device body (2); the back of the upper seat (221) is provided with an upper seat wire groove; the inner side of the back cover (222) is provided with a wing-shaped card slot that matches the upper seat wire groove; the four corners of the frame (22) are covered with plastic corner sleeves (23); the plastic corner sleeves (23) are detachably connected to the frame (22); the inner side of the frame (22) is affixed with a composite reflective strip (24); the composite reflective strip The reflective surface of the composite reflective strip (24) is serrated and covered with a layer of metal reflective film (24b); the "V"-shaped notch groove of the reflective surface of the composite reflective strip (24) faces the frame (22) opposite thereto, the "V"-shaped notch groove of the reflective surface of the composite reflective strip (24) is filled with a light-transmitting adhesive (24a), and a planar light-transmitting protective layer (24c) is bonded to the light-transmitting adhesive (24a); or the "V"-shaped notch groove of the reflective surface of the composite reflective strip (24) faces the frame (22), and the back of the "V"-shaped notch groove is covered with a light-transmitting protective layer (24c).

2. The large-size intelligent touch device according to claim 1, characterized in that: A WiFi wireless transmission screen-scaling device (14) is also provided in the chassis of the host control module (1), the WiFi wireless transmission screen-scaling device (14) having a printed antenna (141), a patch of the printed antenna (141) being attached to the side of the chassis, and the WiFi wireless transmission screen-scaling device (14) being connected to the PC mainboard (13) via a data cable.

3. The large-size intelligent touch device according to claim 2, characterized in that: The channel wire material of the printed antenna (141) is RG316 or RG178 coaxial cable, and the length of the printed antenna (141) does not exceed 1 m.

4. The large-size intelligent touch device according to claim 1, characterized in that: The PC mainboard (13) has a mainboard port (131) built therein, and the host control module (1) is connected to an integrated HUB port (132) connected to the PC mainboard (13), and the integrated HUB port (132) is connected to the infrared touch module (3) of the device body (2) and the HDMI interface of the projection device (4) through data cables, respectively, and each data cable interface has a "concave" wire groove in front and a protective cover on the top.

5. The large-size intelligent touch device according to claim 1, characterized in that: The infrared touch module (3) is arranged on the frame (22); the touch mainboard (31) of the infrared touch module (3) is connected to two or four infrared cameras (32); the two infrared cameras (32) are arranged at two adjacent corners of the frame (22); each infrared camera (32) is installed at a corner of the frame (22) via a base; an "L"-shaped right-angle notch is arranged on the base; and the infrared camera (32) lens is located on the right-angle bisector of the "L"-shaped right-angle notch.

6. The large-size intelligent touch device according to claim 1, characterized in that: The infrared touch module (3) is mounted on the wide side of the device body (2), and a light-transmitting cover plate (25) is mounted on the inner side wall of the wide side of the frame (22).

7. The large-size intelligent touch device according to claim 6, characterized in that: The inner side of the light-transmitting cover plate (25) is coated with an infrared anti-reflection film, the wavelength of which is 760-960nm; or / and The outer side of the light-transmitting cover plate (25) is plated with a filter film, and the filter light is 400-600nm.

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