WO2014086084A1

WO2014086084A1 - Infrared touch screen

Info

Publication number: WO2014086084A1
Application number: PCT/CN2013/000321
Authority: WO
Inventors: 唐海卫; 钟德超; 敖勇
Original assignee: 成都吉锐触摸技术股份有限公司
Priority date: 2012-12-05
Filing date: 2013-03-19
Publication date: 2014-06-12

Abstract

Disclosed is an infrared touch screen, including a light guiding pillar, a touch screen body, a circuit board and an infrared tube. A bearing platform is provided on the light guiding pillar and integrally formed with the light guiding pillar; the bearing platform is located between the touch screen body and the circuit board; and the touch screen body is fixedly connected to the bearing platform, and the circuit board is fixedly connected to the bearing platform. The invention enables infrared light emitted by an infrared ray emission tube to be transmitted to an infrared receiving tube with minimal attenuation, and can also avoid the occurrence of the edge effect, so that a touch screen body and a circuit board can be located and mounted, and the touch screen body maintains a relatively high degree of parallelism, further reducing the suspension height.

Description

Description book infrared touch screen

Technical field

[0001] The present invention relates to a touch screen, and more particularly to an infrared touch screen.

Background technique

[0002] Existing infrared touch products are adopted by means of an infrared transmitting tube and an infrared receiving tube which are arranged uniformly in the X and Y directions along the periphery of the touch area, and the control and driving circuit are under the control of the MCU execution code. The infrared emitting tube and the infrared receiving tube are driven to form an infrared matrix that intersects the X direction and the Y direction in a vertical direction. When there is a touch, the finger or other object blocks the horizontal and vertical infrared rays passing through the point, and the control system determines the position of the touch point on the touch screen.

[0003] At present, in the field of infrared touch screens, such as "a mirror applied to a touch screen" of the patent number 200820109789.4, the main purpose of the invention is to reduce the number of transmitting and receiving units on the infrared touch screen by half by using the principle of reflection. The patent principle is 201020271 758.6 "a flat-screen multi-touch screen". The main principle of the invention is: Adding a light guide plate to the ordinary infrared touch screen for filling the cavity on the touch surface of the ordinary touch screen; In order to achieve a seemingly flat surface effect; such as 200710028616.X "an infrared touch screen and its multi-touch positioning method" and so on. The existing infrared touch screen patent technology or product 屮 whether it is a single-point or multi-point infrared touch screen, the basic assembly method of the infrared touch screen is to place the infrared tube on the touch surface of the touch screen. In this structure, the following problems exist. : 1. Poor ability to resist light interference. The existing infrared touch screen, because the infrared tube is placed on the touch surface, the external light is easily incident on the infrared receiving unit, thereby affecting the normal operation of the touch screen, so the general screen body can not be in strong light (such as sunlight or strong The incandescent lamp) works fine.

[0004] 2. The four sides of the touch surface of the infrared touch screen have wider and higher edge protrusions. In the field of the existing infrared touch screen, the infrared tube is mounted on the h side of the touch surface of the screen, and the thickness of the infrared tube protection structure is formed, thereby forming a higher and wider edge protrusion on the four sides of the screen body, on the touch screen. Installation and touch device designs create significant limitations that are not easily used to make truly integrated infrared touch products.

[0005] In response to the above problems, US Patent No. 2007/0165008 A1 "a small infrared screen touch screen device" reduces the width of the touch screen frame and the cost of the product. The device "includes a touch screen mounted in the frame, a circuit board mounted behind the rear of the display screen, an infrared emitting device mounted on the circuit board and an infrared receiving device mounted on the circuit board. A first reflection The device and the infrared emitting device perform optical communication, and the first reflecting device can change the direction of the infrared light beam generated by the infrared emitting device at the rear of the display screen to pass through the front region of the display screen. The first reflecting device performs optical communication, and the second reflecting device π]" changes the infrared beam of the front end of the display screen Direction, so that it reaches the infrared detector at the rear of the display. "But the technology still has the following shortcomings in the application:

1. Since the infrared emitting device and the infrared receiving device are mounted on the circuit board, and the circuit board is mounted on the back of the display screen, the reflecting device and the display screen are independent of each other, and the transmitting device and the reflecting device are opposite to each other on the infrared light path. The location is not easy to confirm and reliable. Everyone knows that the infrared transmitting device and the infrared receiving device need one-to-one correspondence, which will inevitably cause great trouble for installation and debugging. At the same time, the unevenness of the back of the display and the relative position change of the display and the reflective structure will affect the installation accuracy. Accuracy will directly affect the performance of touch products.

[0006] 2. Since the circuit board on which the infrared emitting device is mounted and the circuit board of the infrared receiving device are disposed on the back side of the display screen, and the reflecting device 乂 extends beyond the front surface of the display screen, the display has a certain thickness, which will The infrared light that causes the emission of the infrared emitting device to be transmitted to the infrared receiving device needs to travel through the path length in the reflecting device, and the intensity of the light received by the infrared receiving device is weak. The infrared screen device has high cost, low reliability, and weak anti-interference ability.

[0007] 3. The touch surface is the outer surface of the display screen. The long-term use will have a great impact on the display screen, and the suspension height can not be solved at the same time, that is, the touch screen has not responded during the use of the touch screen. This can easily cause various misoperations.

[0008] Another patent number is 200420117952.3 "an optical path system for an infrared touch screen using a mirror", "an infrared transmitting and receiving tube array mounted on an upper surface of a circuit board parallel to the display surface and its front side, and The mirror is formed with a mirror at a 45-degree angle. The infrared light emitted by the infrared emitter tube is reflected by the mirror and reflected by the mirror on the front of the display surface to the front of the receiving tube. The structure is particularly suitable for touch displays. The mirror is mounted between the display surface and the front panel to form a light path, and the transmitting and receiving tubes are mounted on the component circuit board, which reduces the thickness or height of the touch screen. "But the technology has the following disadvantages in application:

1. When the circuit board on which the infrared transmitting tube and the receiving tube are mounted is placed on the back of the display screen, and the mirror is again beyond the front side of the display screen, the display screen has a certain thickness, which will cause the infrared emission tube to be infrared. The path that the light to the infrared receiving tube has to travel is long, and the intensity of the light received by the infrared receiving tube is weak. The infrared screen device is high in cost, poor in reliability, and weak in anti-interference ability.

[0009] 2. The infrared light reflecting surface is at an angle of 45 degrees to the display surface. If the mirror structure is used, the interference of the light interference will be disturbed, and the dust entering the reflecting surface will cause the reflection performance to decrease, resulting in a decrease in signal quality and reliable operation. Sexual decline. If the 45-degree bevel of a right-angled prism is used as the reflective surface, the edge effect of the infrared touch screen will be more obvious, which will seriously affect the touch performance.

[0010] 3. If the system is installed on the front side of the screen, the effect of reducing the thickness or height of the touch screen cannot be achieved. If the circuit board is mounted on the back of the display screen, and the infrared transmitting tube and the infrared receiving tube are mounted on the circuit board, the mirror device and the display screen are independent of each other, and the relative positions of the transmitting tube and the reflecting device are not easy on the infrared light path. Confirmation and reliable fixing, and the infrared transmitting tube and the infrared receiving tube need one-to-one correspondence, which will inevitably bring great trouble to the installation and debugging, and at the same time The unevenness of the back of the screen and the relative position change of the display and the reflective structure will affect the installation accuracy, and the installation accuracy will directly affect the performance of the touch product. The circuit board is mounted on the back of the display, and the reflector and display are independent of each other.

[0011] 4. The touch surface is the outer surface of the display screen, and the long-term use will have a great influence on the display screen, and the floating height can not be solved at the same time, that is, the touch screen has not responded during the use process. This can easily cause various misoperations. Summary of the invention

[0012] It is an object of the present invention to overcome the above problems of the existing infrared touch screen and to provide a novel infrared touch screen. The invention can transmit the infrared light emitted by the infrared emitting tube to the infrared receiving tube with a minimum attenuation, and can avoid the edge effect, so that the touch screen body and the circuit board can be positioned and installed, so that the touch screen body maintains a high parallelism, further Reduce the levitation height.

[0013] In order to achieve the above, the technical solution adopted by the present invention is as follows:

A novel infrared touch screen includes a light guide column, a touch screen body, a circuit board and an infrared tube, wherein: the light guide column is provided with a socket integrated with the light guide column, and the touch screen body is fixedly disposed around the socket platform on.

[0014] The cap is located between the touch screen body and the circuit board, and the touch screen body is fixedly connected with the cap, and the circuit board is fixedly connected with the cap.

[0015] The inner side of the light guiding column extends laterally to form the platform, and the outer side vertically extends to form a skirt, and the circuit board is respectively sealed and fixedly connected with the cap and the skirt, and the skirt, the light guide column, the cap and the circuit board are enclosed. A closed cavity is formed, and the infrared tube is located in the closed cavity.

[0016] The light guiding column has a slanted convex shape in cross section, and a lower portion of the central portion of the convex shape is concave, one side extends to form a platform, and the other side extends to form a vertical skirt.

[0017] The concave surface, the outer side surface, and the inner side surface of the convex-shaped light column are a combination of a curved surface and a plane.

[0018] The concave surface is a curved surface, the outer side surface and the inner side surface are plane, and the angle between the outer side surface and the surface of the bearing platform is greater than 39.5 °, less than 45 ° or greater than 45 ° and less than 55 °, and the inner side surface and the platform The angle between the faces is greater than 64° less than 90° or greater than 90. Less than 140. .

[0019] The concave surface is a curved surface, the outer side surface is a curved surface, the inner side surface is a plane, and the angle between the inner side surface and the surface of the platform is greater than 64. Less than 90° or greater than 90° less than 140°.

[0020] The concave surface is a plane, parallel to the touch screen body or on the |Hj-plane, the outer side surface and the inner side surface are both curved surfaces.

[0021] The concave surface, the outer side surface and the inner side surface are all curved surfaces.

[0022] The concave surface, the outer side surface and the inner side surface are all flat, and the angle between the outer side surface and the surface of the platform is greater than 39.5 ° Less than 45 ° or greater than 45 ° small f 55 °, the angle between the inner side and the face of the cap is greater than 64 ° less than 90 ° or greater than 90. Less than 140°.

[0023] The touch screen body is parallel to an upper surface of the platform, and the circuit board is parallel to a lower surface of the platform.

[00241] The cap, the circuit board and the touch screen body are sealingly connected to form a U-shaped cavity, and the opening of the U-shaped cavity is sealedly connected by a connecting member to form a closed cavity, and the infrared tube is located in the closed cavity. The connector may be a combination of a dustproof foam and a sealant.

[0025] The sealing connection manner of the touch screen body and the cap is bonding, and the sealing connection manner of the circuit board and the cap is bonding or providing a sealing member and being connected by bolts.

[0026] The light guiding column is provided with a connecting groove, and the periphery of the touch screen body is embedded in the connecting groove.

[0027] The touch screen body has an inverted "convex" shape, and the upper portion of the inverted "convex" touch screen body forms a touch surface of the screen body, and the lower middle portion protrudes to form a boss, and the touch screen body is fixedly connected on the platform. The circuit board is disposed in a cavity formed on the inner side of the cap and the sidewall of the touch screen body-bump.

[0028] The circuit board is adhered to the steps on both sides of the inverted "convex" touch screen body.

[0029] The infrared touch screen further includes a protective plate, the guard plate is located at a lower portion of the convex portion of the touch screen body and the lower portion of the cap, and is bonded to the central portion of the touch screen body and the F portion of the cap, and the circuit board is disposed at It is enclosed in a relatively closed cavity surrounded by a touch screen body, a cap, and a shield.

[0030] The shield is a metal plate, and the metal shield is provided with a threaded hole for fixing the metal shield.

[0031] The shield is a mylar sheet.

[0032] The touch screen body is integrally formed by double-layer glass or transparent plastic.

[00331] The touch screen body is formed by cutting glass or transparent plastic.

[0034] The touch screen body is sealingly fixedly connected to the cap, the non-component surface of the circuit board is bonded to the back surface of the touch screen body, and the infrared tubes on the circuit board are all located inside the cap.

[0035] The upper surface of the touch screen body is adhesively connected.

[0036] The touch screen body is mated to the inner surface of the light guide column.

[0037] The front or back surface of the touch screen body is provided with at least one occlusion layer, and the occlusion layer is located in a non-display area of the touch screen body.

[0038] A shielding layer is disposed around the touch screen body.

[0039] The shielding layer is a sheet made of an adhesive tape, a light-shielding paper, a translucent material, a plastic film or a metal sheet, and the thin-film touch screen body is adhesively bonded.

[0040] The occlusion layer is a paint coating or an ink coating applied on the touch screen body. [0041] The thickness of the shielding layer is 0.003-2 mm.

[0042] Advantages of using the present invention are:

In the present invention, the light guide column is provided with a socket integrated with the light guide column, the socket is located between the touch screen body and the circuit board, and the touch screen body is fixedly connected with the cap, and the circuit board is fixed with the cap The infrared tube fixed on the circuit board is located under the light guide column outside the cap. Compared with the structure in which the light guide column is positioned by the touch screen body in the prior art, the present invention adopts a cap structure, and the touch screen body passes through the cap. Mounting and positioning, the touch screen body can be quickly positioned in the integrated frame structure formed by the light guiding column during installation, and the overall structure is better, and accordingly, the circuit board, the infrared transmitting tube and the infrared receiving tube can also be quickly positioned and installed, so that the infrared The touch product is easy to install and debug, which is beneficial to the stability of the entire touch screen structure, and makes the touch screen body more parallel and more accurate, which can improve the touch precision and response speed of the touch screen. Due to the supporting role of the platform, it can be used more than the traditional infrared touch screen. Thin touch screen body, using a thinner touch screen body, not only saves production materials, but also reduces The production cost also shortens the transmission path of infrared light on the touch screen, shortens the transmission path, reduces the divergence of infrared light, and improves the touch precision. The thinner touch screen body also makes the entire touch screen more beautiful, which is conducive to enhancing market competition. At the same time, according to the actual needs, the production of caps of different thickness, with the touch screen body of different thickness, can improve the parallelism of the touch screen body, and reduce the touch suspension height problem indefinitely; The touch screen body is not easy to locate, the parallelism is low, the service life of the device is low, and the four sides of the touch screen have higher and wider edges.

[0043] In the present invention, the inner side of the light guiding column extends laterally to form the cap, and the outer side vertically extends to form a skirt, and the circuit board is respectively sealed and fixedly connected with the cap and the skirt, the skirt, the light guide column, and the bearing The platform and the circuit board are enclosed to form a closed cavity, and the infrared tube is located in the closed cavity. With this structure, since the infrared tube is disposed in the sealed cavity, the interference of the external strong light on the infrared transmitting tube and the infrared receiving tube can be reduced, and the interference can be improved. The accuracy of signal transmission and reception, and the skirt has the effect of preventing dust from entering the touch screen, which can extend the life of the touch screen.

[0044] In the present invention, the cross section of the light guiding column is inclined and convex, and the lower portion of the central portion of the convex shape is concave, one side extends to form a platform, and the other side extends to form a vertical skirt, a cap and The skirts are extended and integrated with the light guide column. The light guide column converges and/or reflects and/or refracts the infrared light*, so that the infrared light beam converges as much as possible into parallel light passing through the touch area of the touch screen, reducing the infrared The attenuation of the optical signal enhances the signal strength of the infrared beam and improves the anti-jamming capability of the touch screen.

[0045] In the present invention, the concave surface, the outer side surface and the inner side surface of the convex-shaped light guiding column are a combination of a curved surface and a flat surface, and can be applied to touch screens of different thicknesses and materials, and through curved surfaces and The combination of planes makes it easy to adjust the convergence and reflection of infrared light, and appropriately adjust the distance between the infrared tube and the curved surface. At the transmitting end, the infrared light dispersed by the emission angle of the infrared tube can be concentrated into approximately parallel light for forward transmission. The terminal can also converge the approximately parallel infrared light in a large angle range, which can increase the detection range and enhance the intensity of the received infrared light signal, thereby reducing the loss of the infrared light signal. Loss, improve the anti-T-interference ability of infrared touch products, and improve the touch precision of infrared touch products.

[0046] 5. According to the invention, the concave surface is a curved surface, the outer side surface and the inner side surface are plane, and the angle between the outer side surface and the surface of the platform is greater than 39.5 °, less than 45 ° or greater than 45 ° and less than 55 °. The angle between the inner side surface and the surface of the cap is greater than 64 ° and less than 90 ° or greater than 90 ° and less than 140 °. The infrared light is concentrated and reflected by the concave surface to facilitate the convergence of infrared light, and then reflected by the outer side and the inner side. The angle within this range can ensure that the infrared light emitted by the launch tube is fully emitted on the infrared reflective interface, preventing the loss of the infrared signal, appropriately adjusting the angle of the refractive interface and the vertical direction, and enabling the reflected infrared light to pass through the refractive interface. After refraction, it is transmitted in a direction parallel to the horizontal plane, while avoiding the edge effect.

[0047] In the present invention, the concave surface is a curved surface, the outer side surface is a curved surface, the inner side surface is a plane, and the angle between the inner side surface and the surface of the platform is greater than 64 ° less than 90 ° or greater than 90 ° Less than 140°, the infrared light passes through the two convergence and emission of the concave surface and the outer side surface to further ensure the convergence of infrared light, reduce the loss of infrared light, and then reflect it to the touch screen body through the inner side surface, and the inner side and the bearing platform are located The angle between the faces is greater than 64° and less than 90° or greater than 90° and less than 140° to avoid edge effects.

[0048] In the present invention, the concave surface is a plane, parallel to the touch screen body or on the same plane, the outer side surface is a curved surface, the inner side surface is a curved surface, infrared light is reflected by the concave surface, and then passed outside The side and inner sides are concentrated and reflected onto the touch screen body, which reduces the loss of infrared light in the light guide column and improves the touch precision.

[0049] In the present invention, the concave surface, the outer side surface and the inner side surface are all flat, and the angle between the outer side surface and the surface of the platform is greater than 39.5 °. 45. Or fire f 45 ° small ^: f 55 °, the angle between the inner side and the surface of the cap is greater than 64 ° less than 90 ° or greater than 9 (Τ less than 140 °, infrared light is directly reflected through the concave, outer and inner sides The touch screen body is convenient for controlling the distance between the infrared light and the touch screen body, thereby facilitating the reduction of the flying height.

[0050] According to the invention, the concave surface, the outer side surface and the inner side surface are arc-shaped surfaces, and the infrared light passes through the convergence and reflection of the three surfaces, thereby further reducing the loss of infrared light.

[0051] In the present invention, the touch screen body is parallel to the upper surface of the platform, and the circuit board is parallel to the lower surface of the platform. This structure not only enhances the parallelism of the screen body, but also enables the infrared emission tube and The corresponding precision between the light guiding columns and the infrared receiving tube and the light guiding column is higher, which is beneficial to enhancing the aggregation degree of the infrared light, and further overcomes the touch early response problem caused by the touch floating height.

[0052] In the invention, the light guiding column is provided with a connecting groove, and the touch screen body is embedded in the connecting groove, so that the light guiding column and the touch screen body are more closely combined, and the stability of each component in the entire touch screen is achieved. better.

[0053] In the present invention, the cap, the circuit board and the touch screen body are sealingly connected to form a U-shaped cavity, and the opening of the U-shaped cavity is sealedly connected by a connecting member to form a closed cavity, and the infrared tube is located in the sealed cavity. Inside the cavity, the sealed cavity provides secondary protection to the infrared emission tube on the circuit board and the circuit board, which can prevent external glare, dust or water from being between the components of the touch screen. A small gap into the interior of the touch screen, an infrared transceiver affect emission tube access precision, this structure is advantageous to improve the life of the touch screen _C

[0054] In the present invention, the sealing connection manner of the touch screen body and the cap is bonding, and the sealing connection manner of the circuit board and the cap is bonding or providing a sealing member and being connected by bolts, and the prior art Compared with directly bonding the circuit board under the touch screen body, the structure first makes the infrared tube on the circuit board and the circuit board more stable, and the long-term use does not reduce the transmission and reception precision, and the touch screen is better in use. When the circuit board or the touch screen body is damaged, the prior art needs to replace the circuit board and the touch screen body at the same time due to inconvenient disassembly, and in this way, only the damaged component needs to be replaced separately.

[0055] In the present invention, the touch screen body has an inverted "convex" shape, and the upper portion of the inverted "convex" touch screen body forms a screen touch surface, and the lower middle portion protrudes to form a boss, and the touch screen body is surrounded. The circuit board is fixedly connected to the socket, and the circuit board is disposed in a cavity formed on the inner side of the socket and the side wall of the convex portion of the touch screen body F. The position of the circuit board changes the position of the infrared tube, thereby reducing the traditional infrared screen. The thickness of the frame can be made into an ultra-low ultra-narrow bezel; on the other hand, a specific beam control lens can be designed according to the light source to meet the requirements of the touch scanning detection for the light source.

[0056] In the present invention, the circuit board is adhered to the steps on both sides of the inverted "convex" touch screen body, and the infrared tube of the structure is used on the back of the first layer of the touch screen body, which can effectively reduce the overall thickness of the touch screen. At the same time, due to the use of light guides to achieve ultra-thin borders, ultra-low borders, and ultra-low suspension height.

[0057] In the present invention, the infrared touch screen further includes a guard plate, the guard plate is located at a lower portion of the bottom of the touch screen body and the lower portion of the cap, and is bonded to the lower portion of the touch screen body and the lower portion of the cap. The circuit board is disposed in a relatively closed cavity surrounded by the touch screen body, the cap and the guard plate, and can effectively avoid the influence of dust, water and other substances on the transmission of infrared light, and ensure the normal use of the touch screen under severe conditions. At the same time, it improves the protection of the product.

[0058] In the present invention, the touch screen body is sealingly and fixedly connected to the cap, the non-component surface of the circuit board is adhesively connected to the back surface of the touch screen body, and the infrared tubes on the circuit board are all located inside the cap. The structure makes the infrared tube on the circuit board and the circuit board more stable in the touch screen, and the infrared receiving tube can accurately receive the infrared light reflected by the light guiding column corresponding to the infrared transmitting tube.

[0059] In the present invention, since the shielding layer is disposed on the front or back of the non-display area of the touch screen body, it is difficult for the external strong light to penetrate the shielding layer and illuminate the infrared tube, thereby reducing the external glare to the infrared tube. The interference improves the accuracy of signal transmission and reception. At the same time, it shields the circuit board and the infrared tube disposed on the back of the touch screen body, making the appearance of the product more beautiful, which is conducive to expanding the competitiveness of the market; The shortcomings of the touch screen in the anti-light interference ability and the lack of aesthetics of the product.

[0060] In the present invention, a shielding layer is disposed around the touch screen body, and the structure can block the outside. After passing through the light guide column, the boundary light enters the display area of the touch screen body from the periphery of the touch screen body, and cooperates with the shielding layer disposed on the front side or the back side of the non-display area of the touch screen body, thereby fully protecting the infrared tube and having stronger anti-light interference capability.

[0061] In the present invention, the shielding layer is a sheet made of tape, light-shielding paper, translucent material, plastic film or metal sheet, and the sheet is bonded to the touch screen body, using common materials and The simple bonding method can overcome the shortcomings of the prior art, such as poor anti-light interference capability of the touch screen and lack of aesthetic appeal of the product, simple structure and low cost; correspondingly using the metal piece as the shielding layer, and also reducing external electromagnetic interference on the circuit board The advantages.

[0062] In the present invention, the use of a paint coating or an ink coating as a shielding layer not only overcomes the shortcomings of the prior art, such as poor resistance to light interference of the touch screen, lack of aesthetic appeal of the product, but also has a simple process and low cost. The advantages.

[0063] In the present invention, the thickness of the shielding layer is 0.003-2 mm, and if the thickness of the shielding layer is greater than 2 mm, the infrared light reflected by the light guiding column is blocked, resulting in a high touch suspension height, if the shielding layer The thickness is less than 0.003mm, the external strong light will interfere with the infrared tube through the touch screen body, and the thickness of the shielding layer is set to 0.003-2mm, which can not only protect the circuit board and the infrared tube, but also cause no damage. Touch the problem with a high hover height.

[0064] Twenty-three, the technical solution of the present invention reduces the frame from the traditional 20MM to about 3MM, the frame height is reduced from 5MM to 1..5MM, and the suspension height is reduced from 3-5MM to 0.3MM.

[0065] In the present invention, the touch screen system formed by the light guide column, the touch screen body, the circuit board, and the infrared tube is separately provided from the display screen, and the touch screen can be separately sold or assembled with the display screen. Sold together to meet the needs of different users. '

DRAWINGS

1 is a schematic structural view of Embodiment 1 of the present invention;

2 is a schematic structural view of Embodiment 2 of the present invention

3 is a schematic structural view of Embodiment 3 of the present invention;

4 is a schematic structural view of Embodiment 4 of the present invention;

Figure 5 is a schematic view of the structure of the seventh embodiment of the present invention

6 is a schematic structural view of Embodiment 8 of the present invention.

Figure 7 is a schematic structural view of Embodiment 11 of the present invention

8 is a schematic structural view of Embodiment 12 of the present invention.

9 is a schematic structural view of Embodiment 13 of the present invention.

Figure 10 is a schematic structural view of Embodiment 14 of the present invention.

11 is a schematic structural view of Embodiment 15 of the present invention.

FIG. 12 is a schematic structural diagram of Embodiment 16 of the present invention; 13 is a schematic top view of the touch screen of FIG.

The figure is marked as: 1, light guide column, 2, touch screen body, 3, circuit board, 4, infrared tube, 5, cap, 6, skirt, 7, closed cavity, 8, concave surface, 9, outer side, 10, inner side, 11, connecting parts, 12, boss, 13, guard, 14, threaded holes, 15, seals, 16, shielding layer, 17, display.

detailed description

Embodiment 1

As shown in FIG. 1 , a novel infrared touch screen includes a light guide column 1 , a touch screen body 2 , a circuit board 3 , and an infrared tube 4 . The light guide column 1 is provided with a cap 5 integrated with the light guide column 1 . The platform 5 is located between the touch screen body 2 and the circuit board 3, and the touch screen body 2 is fixedly connected to the platform 5, the circuit board 3 is fixedly connected to the platform 5, and the infrared tube 4 fixed on the circuit board 3 is located on the platform 5. Below the light guide column 1 on the outside.

Further, the touch screen body 2 is parallel to the upper surface of the cap 5, and the circuit board 3 is parallel to the lower surface of the cap 5.

[0069] The infrared tube of the present invention includes an infrared receiving tube and an infrared emitting tube. The touch screen body 2 can be fixedly connected to the cap 5 by means of bonding, and the circuit board 3 can be fixedly connected to the cap 5 by means of bonding or bolting or bolts and bonding.

Example 2

This embodiment is basically the same as the above embodiment, and the main differences are:

As shown in FIG. 2, in the embodiment, the inner side of the light guiding column 1 extends laterally to form the platform 5, and the outer side vertically extends to form a skirt 6, and the circuit board 3 is respectively fixedly and fixedly connected with the platform 5 and the skirt 6. The skirt 6, the light guide column 1, the cap 5 and the circuit board 3 are enclosed to form a closed cavity 7, and the infrared tube 4 is located in the closed 7 cavity. The manner of sealing the fixed connection can be by bonding but not limited to bonding.

Example 3

As shown in Fig. 3, the cross section of the light guiding column has an inclined convex shape, and the lower portion of the central portion of the convex shape is concave, one side extends to form a platform, and the other side extends to form a vertical skirt. Further, the plane of the skirt is perpendicular to the plane of the board.

[0072] Moreover, the concave surface 8, the outer side surface 9, and the inner side surface 10 of the convex-shaped light guiding column are a combination of a curved surface and a plane

[0073] For example, the concave surface is a curved surface, the outer side surface and the inner side surface are plane, and the angle between the outer side surface and the surface of the bearing platform is greater than 39.5°, less than 45°, or greater than 45°, less than 55°, and the inner side surface is The angle of the face of the cap is greater than 64 ° less than 90 ° or greater than 90 ° less than 140 °. Example 4

As shown in Fig. 4, the concave surface 8, the outer side surface 9, and the inner side surface 10 of the convex-shaped light guiding column are a combination of a curved surface and a flat surface.

[0075] For example, the concave surface 8 is a curved surface, the outer side surface 9 is a curved surface, the inner side surface 10 is a plane, and the angle between the inner side surface 10 and the surface of the cap 5 is greater than 64° and less than 90° or greater than 90° is less than 140°.

Example 5

The concave surface 8, the outer side surface 9, and the inner side surface 10 of the convex-shaped light guiding column are a combination of a curved surface and a flat surface.

[0077] For example, the concave surface 8 is a flat surface parallel to the touch screen body or on the same plane, the outer side surface 9 is an arc surface, and the inner side surface 10 is an arc surface.

Example 6

[0079] For example, the concave surface is a curved surface, the outer side surface is a curved surface, and the inner side surface is a curved surface.

Example 7

As shown in Fig. 5, the concave surface 8, the outer side surface 9, and the inner side surface 10 of the shaped light guiding column are a combination of a curved surface and a flat surface.

[0081] For example, the concave surface 8, the outer side surface 9, and the inner side surface 10 are all flat, and the angle between the outer side surface 9 and the surface of the platform 5 is greater than 39.5 ° and less than 45 ° or greater than 45 ° and less than 55 °. The angle between the side 10 and the surface of the cap 5 is greater than 64° less than 90° or greater than 90° less than 140°.

Example 8

As shown in FIG. 6, the light guiding column 1 is provided with a connecting groove, and the touch screen body 2 is embedded in the connecting groove. The touch screen body 2 is embedded in the connecting groove and bonded, and the four peripheral edges of the bottom surface are bonded to the cap 5.

Example 9

This embodiment is a further description of the above embodiment 3:

The cross section of the light guiding column 1 is substantially inclined "convex" shape, the side of the "convex" shaped light guiding column extends as a laterally-oriented platform 5, the other side extends into a vertical skirt 6, and the lower middle end is formed into a convex curved surface. Converging interface; the outer end of the "convex" shaped light guide column is an inclined plane reflective interface, and the inner end is an inclined plane refractive interface.

[0084] The working principle is as follows: The infrared light guide column is a PMMA material having a refractive index of 1.488 (infrared wavelength of 0.94 nm), The concentrating interface is designed as a curved surface, the arc focus is in the infrared emitting unit (or receiving unit), and the angle between the reflective interface and the surface of the bearing platform is greater than 39.5 ° less than 45 ° or large dry 45 ° less than 55 ° (substantial, reflective interface) When the angle between the reflective interface and the touch screen is 48 degrees, the angle between the refraction interface and the touch screen is 17 degrees, and the light guide column and the receiving end of the transmitting end are at an angle of more than 39.5 ° to less than 45 ° or less than 55 °. The end light guide is completely symmetrical. After the infrared light emitted from the infrared transmitting tube at the transmitting end is concentrated by the concentrating interface, most of the infrared light is converted into vertical upward parallel light, and the vertically upward infrared light is incident on the infrared reflective interface at an incident angle of 48 degrees, due to the light guiding column The refractive index is 1.488. According to the formula ( 1.488 = sin90/sina), the total reflection angle of the material can be calculated as a=41.5 degrees. When infrared light is incident at an incident angle of 48 degrees, full emission will occur at the reflective interface. The angle between the rear infrared light and the touch screen is approximately equal to 6 degrees, and the reflected infrared light is incident on the refractive interface at an angle of about 11 degrees. The refracted light is calculated by the refractive index of 1.488 to emit light in parallel with the touch screen; The parallel light transmitted from the end light guide column is incident on the refractive interface of the infrared light guide column at the receiving end. After being refracted, it is incident on the reflective interface at about 11 degrees, and full emission occurs. After the reflection, the infrared light is concentrated by the concentrating interface and received by the infrared receiving tube. By using the concentrating principle of the convex lens, the distance between the infrared tube and the curved surface is appropriately adjusted, and the infrared light (similar to the point light source) dispersed by the emission angle of the infrared tube can be concentrated at the transmitting end to be forwardly transmitted in approximately parallel light. At the receiving end, the approximately parallel infrared light in a large angle range can be concentrated, which can increase the detection range and enhance the intensity of the received infrared light signal. Thereby, it is beneficial to reduce the loss of infrared light signal, improve the anti-interference ability of the infrared touch product, improve the touch precision of the infrared touch product, and at the same time reduce the infrared tube emission power and improve the service life of the infrared touch product.

Example 10

This embodiment is a further description of the above embodiment 4:

The cross section of the light guiding column is generally inclined "convex" shape, the side of the "convex" shaped light guiding column extends into a lateral bearing platform, and the other side extends into a vertical skirt. The lower end of the light guiding portion is formed by a convex curved surface. The light interface; the outer end of the "convex" shaped light guide column has a reflective interface of the inclined curved surface, and the inner end end has an inclined plane refractive interface.

[0086] The working principle is as follows: the light guide column is a PMMA material having a refractive index of 1.488 (infrared wavelength of 0.94 nm), the concentrating interface 8 is designed as a plane or a curved surface, and the reflective interface is a curved surface, and the refractive interface is The angle of the touch screen body plane is 17 degrees. The light guide column at the transmitting end and the light guide column at the receiving end are completely symmetrical. After the infrared light emitted from the infrared emitting tube of the transmitting end passes through the concentrating interface, the infrared reflecting interface is refracted upward, and full emission occurs at the reflective interface, and the parallel light is reflected to be parallel light due to the curved surface of the reflective interface, and the parallel light is reflected after the infrared light The angle with the touch screen is approximately equal to 6 degrees, and the reflected infrared light enters the refractive interface at an angle of about 11 degrees. The refracted light is calculated by the refractive index of 1.488 to emit light parallel to the touch surface. At the receiving end, the emission end is guided. The parallel light transmitted from the beam is incident on the refraction interface, and is transmitted to the reflection interface at a refraction angle of about 11 degrees. Then, the infrared light is totally emitted and is focused by the ten-reflection interface to focus on the surface and turned to the focus in the infrared of the infrared receiving tube. Light is received by the infrared receiving tube through the concentrating interface. When the infrared reflective interface is a curved surface, it is similar to a concave mirror. Has the following advantages: Infrared The infrared light emitted by the launch tube is condensed by the concentrating interface and does not guarantee that all the light is parallel light, or there is a part of infrared light having a certain divergence angle, and the condensing effect of the concave mirror (such as a car lamp, a flashlight, etc.) can be used. The infrared light with a large divergence angle is concentrated into parallel light, thereby reducing the loss of the infrared light signal, improving the anti-interference ability of the infrared touch product, improving the touch precision of the infrared touch product, and reducing the infrared tube emission power.

[0087] All the above embodiments can prevent the loss of the infrared signal, appropriately adjust the angle between the refractive interface and the vertical direction, and can cause the reflected infrared light to be refracted through the refractive interface and then transmitted in a direction parallel to the horizontal plane, and can be avoided at the same time. Edge effect; It is beneficial to reduce the loss of infrared light signal, improve the anti-interference ability of infrared touch products, improve the touch precision of infrared touch products, and at the same time reduce the infrared tube emission power and improve the practical life of infrared touch products; It is fixed to the upper surface of the cap, and the circuit board is fixed to the lower surface of the cap. The touch screen is fixed on the top of the cap, which is beneficial to the stability of the entire light guide column structure, reduces the suspension height, and also enhances the touch feeling. The circuit board is fixed (bonded or screwed and locked) on the lower surface of the cap, which is beneficial to infrared emission. The alignment with the infrared receiving tube makes the infrared touch product easy to install and debug, and is suitable for mass production.

Embodiment 1 1

A novel infrared touch screen comprises a light guiding column 1, a touch screen body 2, a circuit board 3 and an infrared tube 4. The light guiding column 1 is provided with a platform 5 integrated with the light guiding column 1, and the receiving platform 5 is located on the touch screen Between the body 2 and the circuit board 3, the touch screen body 2 is fixedly connected to the platform 5, and the circuit board 3 is fixedly connected to the platform 5.

[0089] Further, as shown in FIG. 7, the cap 5, the circuit board 3 and the touch screen body 2 are sealingly connected to form a U-shaped cavity, and the opening of the U-shaped cavity is sealedly connected by the connecting member 11 to form a closed cavity. The infrared tube 4 is located in the closed chamber 7. The connector 11 can be a combination of a dustproof foam and a sealant.

[0090] In a preferred embodiment of the present embodiment, the sealing connection between the touch screen body 2 and the platform 5 is bonding, and the sealing connection between the circuit board 3 and the platform 5 is to bond or set a sealing member and pass the bolt. connection.

Example 12

This embodiment is a further description of Embodiment 11. As shown in FIG. 8, the light guiding column 1 is provided with a connecting groove, and the touch screen body 2 is embedded around the connecting groove, and the bottom surface of the touch screen body 2 is sealed with the bearing table 5 by a sealant.

Example 13

As shown in FIG. 9, the infrared touch screen includes a light guide column 1, a touch screen body 2, and a circuit board 3. The touch screen body 2 has an inverted "convex" shape, and the upper portion of the inverted "convex" touch screen body 1 forms a touch surface, and the lower middle portion is convex. The boss 12 is formed, and the lower portions on both sides of the touch screen body 2 are placed on the platform 5 of the light guide column 1, and the circuit board 3 is placed in a cavity formed inside the cap 5 and the side wall of the lower projection 12 of the touch panel body. The circuit board 3 is bonded to the lower step on both sides of the inverted "convex" touch screen body 2. [0093] The infrared touch screen further includes a guard plate 13 which is located at a lower portion of the boss 12 and the lower portion of the cap 5 in the middle of the touch screen body 2, and is bonded to the lower portion of the center of the touch screen body 2 and the lower portion of the platform 5. The guard plate 13 is made of a metal plate, and the metal shield is provided with a threaded hole 14 for fixing the metal shield. It can be connected to the display through a threaded hole 14.

[0094] The touch screen body 2, the light guide column 1, and the shield 13 enclose a relatively closed cavity 7, and the circuit board 3 is located in the closed cavity.

Within 7. The touch screen body 2 described above is integrally formed by double-glazed glass or transparent plastic.

[0095] The structure infrared tube 4 is on the back of the first layer of the touch screen body, which can effectively reduce the overall thickness of the touch screen, and at the same time achieves an ultra-thin frame, an ultra-low frame, and an ultra-low suspension height, and a light guiding element and a touch screen due to the use of the light guiding element. On the back of the body, install a mounting shield for easy installation of the touch screen and display device (display, all-in-one, tablet, etc.).

Example 14

This embodiment is basically the same as the embodiment 13, and the main differences are as follows:

As shown in FIG. 10, the shield 13 is a mylar sheet, which can effectively reduce the overall thickness of the touch screen, and achieves an ultra-thin bezel, an ultra-low bezel, and an ultra-low suspension height due to the use of the light guiding element. The above touch screen body is formed by cutting a piece of glass or transparent plastic.

[0097] The structure is waterproof, dustproof, etc., and is easy to repair and replace with a circuit board such as a convenient replacement circuit.

Example 15

As shown in FIG. 11 , an infrared touch screen includes a touch screen body 2 , a light guide column 1 , and a circuit board 3 . The circuit board 3 is fixedly mounted with an infrared tube 4 , and the touch screen body 2 is bonded to the upper surface of the platform 5 . The non-component surface of the circuit board 3 is bonded to the back surface of the touch screen body 2, and the infrared tubes 4 on the circuit board 3 are all located inside the platform 5.

[0099] Or the lower surface of the cap 5 is connected with a sealing member 15, and the sealing member 15, the touch screen body 2 and the cap 5 form a closed cavity structure through the sealant, and the circuit board 3 and the circuit board 3 The infrared tube 4 is located in the closed cavity 7; the sealing member 15 is preferably adhesively connected to the cap 5, but may also be connected by bolting or bolting; the sealing glue comprises dustproof glue, waterproof glue, rubber Products, silicone products, preferably sealed with EVI foam, dust-proof strips, EPE and other flexible entities.

[0100] Further, the sealing member is preferably an L-shaped plastic plate or a sheet metal panel, and one end of the L-shape is fixedly connected to the lower surface of the platform, and the other end is bonded to the back of the touch screen body, but is not limited. f The above setting method, for example, the sealing member may also be a circular-shaped metal piece or the like

Example 16

The infrared touch screen includes a touch screen body 2, a light guide column 1, and a circuit board 3 including an infrared tube 4. The back surface of the touch screen body 2 is fixedly connected to the platform 5 of the light guide column 1. The front or back surface of the touch screen body 2 is provided with at least one The occlusion layer 16 is located in the non-display area of the touch screen body 2. [0102] In the preferred embodiment of the present embodiment, the occlusion layer 16 disposed on the front or back of the touch screen body 2 is flush with the frame of the display screen 17 disposed under the touch screen body 2.

Further, it is preferable that the occlusion layer 16 is also disposed around the touch screen body 2 to cooperate with the occlusion layer 16 on the front or the back of the touch screen body 2 to comprehensively protect the touch screen body 2, thereby improving the anti-light interference capability of the touch screen.

[0104] In another preferred embodiment of the present embodiment, the shielding layer 16 is a sheet made of tape, a light-shielding paper, a translucent material, a plastic film or a metal sheet, and the sheet is adhesively connected to the touch screen body. However, it is not limited to the above, and other light-shielding materials known in the prior art may be employed.

[0105] The preferred embodiment of the present embodiment is that the occlusion layer 16 is a paint coating or an ink coating applied on the touch screen body.

[0106] Further, the shielding layer 16 may be formed by a printing screen printing process, that is, printing a black or patterned pattern in a region where shielding is required, and may also be formed by a corrosion or biting process, that is, etching in a region where shielding is required. Or bite the flower to achieve the matte effect, to block the infrared tube and the metal frame of the display, which has the effect of shading and beautifying.

[0107] In a preferred embodiment of the present embodiment, the shielding layer 16 has a thickness of 0.003-2 mm.

[0108] The touch screen body 2 non-display area refers to an area other than the screen body corresponding to the display area of the display screen 17.

[0109] As shown in FIGS. 12 and 13, at least one shielding layer 16 is disposed on the front, back, and periphery of the touch screen body 2, wherein the shielding layer 16 on the front and back sides of the touch screen body 2 is preferably made of the same material. However, it is not limited to the above arrangement, for example, the shielding layer on the front side of the touch screen body is made of metal sheet, the shielding layer on the back side is made of light-shielding paper, and the front and back shielding layers can be any of the following: '. production.

Claims

Claim

1. An infrared touch screen comprising a light guide column (1), a touch screen body (2), a circuit board (3) and an infrared tube (4), wherein: the light guide column (1) is provided with a light guide column (1) The integrated platform (5), the touch screen body (2) is fixedly disposed on the platform (5).

2. The infrared touch screen according to claim 1, wherein: the cap (5) is located between the touch screen body (2) and the circuit board (3), and the touch screen body (2) and the cap (5) Fixed connection, the circuit board (3) is fixedly connected to the platform (5).

3. The infrared touch screen according to claim 1, wherein: the inner side of the light guiding column (1) extends laterally to form the platform (5), and the outer side vertically extends to form a skirt (6), a circuit board (3) ) sealingly and fixedly connected to the cap (5) and the skirt (6) respectively, the skirt (6), the light guide column (1), the cap (5) and the circuit board (3) are enclosed to form a closed cavity, the infrared tube

(4) Located in a closed chamber

4. The infrared touch screen according to claim 3, wherein: the light guiding column (1) has a slanted convex shape in cross section, a lower portion of the central portion of the convex shape is concave, and one side extends to form a cap (5). The other side extends to form a vertical skirt (6).

5. The infrared touch screen according to claim 4, wherein: the concave surface of the convex shaped light guiding column (1)

(8), outer side (9), inner side (10) is a combination of curved surface and plane.

6. The infrared touch screen according to claim 5, wherein: the concave surface (8) is a curved surface, and the outer surface

(9) and the inner side (10) are plane, the angle between the outer side (9) and the surface of the platform (5) is greater than 39.5° less than 45° or greater than 45° less than 55°, and the inner side (10) is bearing The angle of the table (5) is greater than 64° less than 90° or greater than ten 90° less than 140°

7. The infrared touch screen according to claim 5, wherein: the concave surface is a curved surface, the outer side surface is a curved surface, the inner side surface is a plane, and an angle between the inner side surface and the surface of the cap is greater than 64. ° Less than 90° or greater than 90° Less than 140. .

8. The infrared touch screen according to claim 5, wherein: the concave surface is a plane, parallel to the touch screen body or on the same plane, and the outer side surface and the inner side surface are both curved surfaces.

9. The infrared touch screen according to claim 5, wherein: the concave surface (8), the outer side surface (9) and the inner side surface (10) are flat, the outer side surface (9) and the bearing platform (5) The angle between the face is greater than 39.5° less than 45° or greater than 45° less than 55°, and the angle between the inner side (10) and the surface of the cap (5) is greater than 64° less than 90° or greater than 90° less than 140° .

The infrared touch according to any one of claims 1 to 9, wherein: the touch screen body (2) is flush with an upper surface of the cap (5), and the circuit board (3) and the cap The lower surface of (5) is parallel.

11. The infrared touch screen of claim 1 characterized by _f" _: said cap (5), circuit board (3) and touch The screen body (2) is sealingly connected to form a U-shaped cavity, and the opening of the U-shaped cavity is sealedly connected by a connecting member (11) to form a closed cavity (7), and the infrared tube (4) is located in the closed cavity (7).

12. The infrared touch screen according to claim 10, wherein: the sealing connection between the touch screen body (2) and the platform (5) is bonding, and the sealing of the circuit board (3) and the bearing platform (5) The connection method is to bond or set the seal and connect by bolts.

The infrared touch screen according to claim 10, wherein: the light guiding column (1) is provided with a connecting groove, and the touch screen body (2) is embedded in the connecting groove.

The infrared touch screen according to claim 1, wherein: the touch screen body (2) has an inverted "convex" shape, and the upper portion of the inverted "convex" touch screen body (2) forms a screen touch surface. The lower middle portion is convexly formed to form a boss (12), and the touch screen body (2) is fixedly connected to the cap (5), and the circuit board (3) is disposed on the inner side of the cap (5) and the lower part of the touch screen body (2) The cavity (12) is formed in the cavity of the side wall.

15. The infrared touch screen according to claim 14, characterized in that: the circuit board (3) is adhered to the steps on both sides of the inverted "convex" touch screen body (2).

16. The infrared touch screen according to claim 14 or 15, further comprising: a guard plate (13), the guard plate (13) is located at the middle of the touch screen body (2), the boss (12) and the cap ( 5) The lower part is bonded to the touch panel body (2) the middle boss (12) and the f portion of the cap (5), and the circuit board (3) is disposed on the touch screen body (2), the cap (5), Guard

(13) Enclosed in a relatively closed chamber (7).

The infrared touch screen according to claim 1, wherein: the touch screen body (2) is sealingly and fixedly connected to the cap (5), the non-component surface of the circuit board (3) and the back surface of the touch screen body (2) Bonding, and the infrared tube (4) on the board (3) is located inside the cap (5).

The infrared touch screen according to claim 9, wherein the touch screen body (2) is provided with at least a layer of a shielding layer (16). The occlusion layer (16) is located in the non-display area of the touch screen body (2).