Optical touch device

Abstract

The utility model relates to an optical touch device which solves the problems that an existing camera optical touch device is not ideal and uneven in exposure, and coupling between a backlight component and a whole machine manufacturer is too deep. Comprising a glass plate, more than one infrared emission LED lamp, more than two cameras and more than two reflection strips, and a coating used for inclining emitted light in the glass plate is arranged on the glass plate corresponding to the infrared emission LED lamp. During use, light rays which are emitted by the infrared emission LED lamp and are perpendicular to the glass plate deviate through the coating on the glass plate, the light rays are repeatedly reflected in the glass plate and then illuminate the whole glass plate, and the light rays are received by the camera through the reflecting strip, so that the exposure of the camera is more uniform and ideal, and meanwhile, the camera is not coupled with a whole machine manufacturer; when a finger or a touch object touches the glass, light in the glass overflows, the camera can shoot the light reflected by the finger or the touch object, and then positioning is carried out through coordinate calculation.

Description

Technical Field

[0001] This utility model relates to the field of electronic devices, specifically to an optical touch device. Background Technology

[0002] Currently, most camera optical touch devices on the market have their external exposure positions inside the camera module. This structure results in suboptimal and uneven exposure. Existing exposure devices require an exposure plate on a glass plate, leading to a high touch height at the top of the device. Furthermore, the backlight is too deeply coupled with the device manufacturer's specifications, making decoupling difficult and troubleshooting challenging. All of these aspects have significant drawbacks and fail to enhance the value of the touch components. Utility Model Content

[0003] The purpose of this invention is to solve the problems of unsatisfactory and uneven exposure in existing camera optical touch devices, and the excessive coupling between the backlight components and the device manufacturer.

[0004] The technical solution adopted to solve the technical problem proposed by this utility model is as follows: The optical touch device of this utility model includes a glass plate, one or more infrared emitting LEDs, two or more cameras, and two or more reflective strips. The infrared emitting LEDs are arranged corresponding to the inner edge of the glass plate. The glass plate is provided with a coating for tilting the light emitted by the infrared emitting LEDs perpendicular to the glass plate inside the glass plate. One reflective strip is arranged corresponding to one camera. The reflective strip is located on the outer edge of the glass plate and protrudes from the side of the glass plate. The camera is located on the side of the glass plate and is arranged corresponding to the inner side of the reflective strip.

[0005] The technical solutions that further define this utility model include:

[0006] The coating is a first reflective layer, and a first chamfer is provided on the outer surface of the glass plate corresponding to the infrared emitting LED light, and the first reflective layer is located on the first chamfer.

[0007] The first chamfer angle is 45 degrees.

[0008] The coating is a light-refracting material coating, which is located on the inner surface of the glass plate.

[0009] The outer surface of the reflective strip has a second chamfer corresponding to the camera, and a second reflective coating is provided on the second chamfer.

[0010] The infrared emitting LED light is located on any one, two, or three of the upper, left, and right edges of the glass plate.

[0011] The two cameras are positioned at both ends of the upper side of the glass plate.

[0012] The beneficial effects of this utility model through the above technical solution are as follows: When the optical touch device of this utility model is used, the light emitted by the infrared LED lamp perpendicular to the glass plate is deflected by the coating on the glass plate. After repeated reflections inside the glass plate, the light illuminates the entire glass plate. The light is received by the camera through the reflective strip, making the camera exposure more uniform and ideal. At the same time, it is not coupled with the whole machine manufacturer, which is conducive to troubleshooting. In addition, there is no need for an exposure plate, which can also effectively reduce the touch height. When a finger or object touches the glass, the light inside the glass will overflow, and the camera can capture the light reflected by the finger or object. The coordinates of the touch position can be calculated based on the intersection of the light emitted from the same position by two or more cameras, and then the location can be determined by coordinate calculation. Attached Figure Description

[0013] Figure 1 This is a front view structural diagram of an optical touch device according to the present invention.

[0014] Figure 2 This is a side view of the optical touch device of this utility model.

[0015] Figure 3 for Figure 2 A magnified structural diagram of point A in the middle.

[0016] Figure 4 This is a schematic diagram of the structure of an embodiment of an optical touch device according to the present invention.

[0017] Figure 5 This is a schematic diagram of a second embodiment of an optical touch device according to the present invention. Detailed Implementation

[0018] The structure of this utility model will be further described below with reference to the accompanying drawings.

[0019] Reference Figures 1 to 5In this application, "outer side" and "inner side" refer to the placement of the glass plate during use. The touch side of the glass plate during use is the outer side, and the side opposite to the touch side is the inner side. "Up," "down," "left," and "right" are all relative to the placement of the glass plate during use. An optical touch device includes a glass plate 1, one or more infrared emitting LEDs 2, two or more cameras 3, and two or more reflective strips 4. The infrared emitting LEDs are disposed on the inner edge of the glass plate. The glass plate is provided with a coating 5 corresponding to the infrared emitting LEDs to tilt the light emitted by the infrared emitting LEDs perpendicular to the glass plate within the glass plate. One reflective strip is provided for one camera. The reflective strip is located on the outer edge of the glass plate and protrudes from the side of the glass plate. The camera is located on the side of the glass plate and is disposed on the inner side of the reflective strip. In this first embodiment, the coating 5 is a first reflective layer 51. The outer surface of the glass plate 1 corresponding to the infrared emitting LEDs is provided with a first chamfer 11, and the first reflective layer is located on the first chamfer. When the light emitted by the externally emitted LED light enters the glass plate perpendicularly, it is reflected by the reflective layer at the first chamfered angle, forming a diagonal line. This line is then repeatedly reflected within the glass plate before being reflected again by the reflective strip and finally captured by the camera. When a finger or object touches the glass, the light inside overflows, and the camera captures the reflected light, using coordinate calculations to pinpoint the location. The first chamfered angle is 45 degrees. Other chamfer angles can be set in practice.

[0020] In this second embodiment, coating 5 is a light-refracting material coating 52, located on the inner surface of the glass plate. When the light emitted by the infrared LED light strikes the glass plate surface perpendicularly, it is refracted by the light-refracting material coating on the glass plate into an oblique line, and then repeatedly reflected within the glass plate before being reflected by the reflective strip and received by the camera. When a finger or object touches the glass, the light inside the glass overflows, and the camera can capture the light reflected by the finger or object, thereby using coordinate calculations for positioning.

[0021] In this embodiment, the outer surface of the reflective strip 4 is provided with a second chamfer 41 corresponding to the camera, and a second reflective coating 42 is provided on the second chamfer. The reflected light inside the glass is received by the camera through the reflection of the second reflective coating. When a finger or object touches the glass, the light inside the glass will overflow, and the camera can capture the light reflected by the finger or object, and then locate it by coordinate calculation.

[0022] In this embodiment, the infrared emitting LED is located on any one, two, or three of the top, left, and right edges of the glass plate. More than one infrared emitting LED can be positioned on any one, two, or three of the top, left, and right edges of the glass plate as needed. Even if water falls, it will not corrode the circuit board.

[0023] In this embodiment, two cameras are installed, positioned at opposite ends of the upper side of the glass plate. The coordinates of the touch location can be calculated based on the intersection of the light rays emitted from the same location by the two cameras, and the location is then determined through coordinate calculation. In practice, more than two cameras can be used.

[0024] When the optical touch device of this invention is in use, the light emitted by the infrared LED lamp, perpendicular to the glass plate, is deflected by the coating on the glass plate. After repeated reflections within the glass plate, the light illuminates the entire glass plate. The light is received by the camera through the reflective strip, making the camera exposure more uniform and ideal. At the same time, it is not coupled with the OEM, which is conducive to troubleshooting. In addition, it does not require an exposure plate, which can also effectively reduce the touch height. When a finger or object touches the glass, the light inside the glass will overflow. Two or more cameras can capture the light reflected by the finger or object. The coordinates of the touch position can be calculated based on the intersection of the light emitted from the same position by the two or more cameras, and the location can be determined by coordinate calculation.

[0025] Although specific embodiments of the present invention have been described in detail with reference to the accompanying drawings, this should not be construed as limiting the scope of protection of the present invention. Various modifications and variations that can be made by those skilled in the art without inventive effort within the scope described in the claims still fall within the scope of protection of the present invention.

Claims

1. An optical touch device, characterized in that: The touch device includes a glass plate, one or more infrared emitting LEDs, two or more cameras, and two or more reflective strips. The infrared emitting LEDs are positioned on the inner edge of the glass plate. The glass plate is coated with a layer corresponding to the infrared emitting LEDs to tilt the light emitted by the infrared emitting LEDs perpendicular to the glass plate within the glass plate. Each reflective strip corresponds to one camera. The reflective strip is located on the outer edge of the glass plate and protrudes beyond the side of the glass plate. The camera is located on the side of the glass plate and is positioned on the inner side of the reflective strip.

2. The optical touch device as described in claim 1, characterized in that: The coating is a first reflective layer, and a first chamfer is provided on the outer surface of the glass plate corresponding to the infrared emitting LED light, and the first reflective layer is located on the first chamfer.

3. An optical touch device as described in claim 2, characterized in that: The first chamfer angle is 45 degrees.

4. An optical touch device as described in claim 1, characterized in that: The coating is a light-refracting material coating, which is located on the inner surface of the glass plate.

5. An optical touch device as described in claim 1, characterized in that: The outer surface of the reflective strip has a second chamfer corresponding to the camera, and a second reflective coating is provided on the second chamfer.

6. An optical touch device as described in claim 1, characterized in that: The infrared emitting LED light is located on any one, two, or three of the upper, left, and right edges of the glass plate.

7. An optical touch device as described in claim 1, characterized in that: The two cameras are positioned at both ends of the upper side of the glass plate.

Images