CN107168590B

CN107168590B - Surface-mounted composite infrared tube for touch screen

Info

Publication number: CN107168590B
Application number: CN201710523128.XA
Authority: CN
Inventors: 王继岷; 解军; 曾一雄; 蒋向东; 严亮
Original assignee: Chengdu Uestc Optical Communication Co ltd
Current assignee: Chengdu Uestc Optical Communication Co ltd
Priority date: 2017-06-30
Filing date: 2017-06-30
Publication date: 2023-07-07
Anticipated expiration: 2037-06-30
Also published as: CN107168590A

Abstract

The invention provides a surface-mounted composite infrared tube for a touch screen, which comprises a lens, a receiving tube core, a transmitting tube core and a PCB (printed circuit board), wherein the lens comprises a light condensing part and a reflecting part, the reflecting part is provided with a semi-transparent and semi-reflective layer and a reflecting surface, the receiving tube core and the transmitting tube core are arranged on the PCB, and the lens is arranged above the PCB in a covering way and covers the receiving tube core and the transmitting tube core. The invention can realize high-density arrangement on the basis of strong light resistance and improve resolution; the pins are reduced, wiring difficulty of the wiring board can be reduced, and meanwhile, narrow frame design can be realized.

Description

Surface-mounted composite infrared tube for touch screen

Technical Field

The invention relates to the field of touch screens, in particular to a surface-mounted composite infrared tube for a touch screen.

Background

When the infrared tube for the touch screen solves the problem of strong light resistance, a scheme of distributing an infrared transmitting tube 2 and an infrared receiving tube 3 on each side is adopted, as shown in figure 1. When the system works, only one set of system is effective, namely one side transmits and the other side receives, and the situation that one side transmits and the same side receives can not occur. However, when strong light influence occurs, the receiving of one side is irradiated and saturated, so that the system can not work normally, the transmitting and receiving of the system are exchanged, the originally transmitted side becomes the receiving, the originally received side becomes the transmitting, the normal work of the system is ensured, and the strong light resisting effect is realized.

The foregoing solution requires that both the transmitting tube and the receiving tube be distributed on one side, which may have the following problems: firstly, the density of the actual working tube is low, so the resolution of the touch screen is low; secondly, the width of the board is increased, so that a narrow frame cannot be made; and thirdly, the infrared frame elements are more, the pins are more, and the wiring difficulty is high.

Disclosure of Invention

Aiming at the problems existing in the prior art, the invention provides a surface-mounted composite infrared tube for a touch screen, which solves the problems of low density, more pins and the like of the infrared tube arranged on the conventional touch screen.

The invention aims at realizing the following technical scheme:

the surface-mounted composite infrared tube for the touch screen is characterized by comprising a lens, a receiving tube core, an emitting tube core and a PCB (printed circuit board), wherein the lens comprises a light condensing part and a reflecting part, the reflecting part is provided with a semi-transparent semi-reflecting layer and a reflecting surface, the receiving tube core and the emitting tube core are arranged on the PCB, and the lens is arranged above the PCB in a covering manner and covers the receiving tube core and the emitting tube core.

Further, the semi-transparent and semi-reflective layer is an air gap reflective layer or a thin film reflective layer.

Further, the reflection surface is a total reflection surface formed by the reflection portion.

Further, the receiving die is arranged below the reflecting surface, and the transmitting die is arranged below the semi-transparent and semi-reflective layer.

Further, the transmitting tube core is arranged below the reflecting surface, and the receiving tube core is arranged below the semi-transparent and semi-reflective layer.

Further, the pins of the receiving tube core and the transmitting tube core are welded on a PCB board, and the PCB board is provided with an extraction electrode.

Compared with the prior art, the invention has the following advantages:

1. the high-density arrangement on the basis of strong light resistance can be realized and the resolution is improved as the common infrared transmitting tube or infrared receiving tube has the same size.

2. The pins are reduced, the front and back and left and right staggered arrangement of infrared emission and receiving tubes is not needed, the wiring difficulty of the wiring board is reduced, and meanwhile, the design of a narrow frame can be realized.

Drawings

FIG. 1 is a layout structure diagram of an infrared tube of a conventional touch screen;

FIG. 2 is a schematic diagram of the structure of the present invention;

fig. 3 is a schematic top view of fig. 2.

Reference numerals illustrate:

1 is a first electrode, 2 is a second electrode, 3 is a third electrode, 4 is a semi-transparent and semi-reflective layer, 5 is a PCB board, 6 is a reflective surface, 7 is a receiving die, 8 is a transmitting die, 9 is a lens, 91 is a condensing part, and 92 is a reflecting part.

Detailed Description

The invention will now be described in detail with reference to the drawings and specific examples.

Examples

The invention provides a surface-mounted composite infrared tube for a touch screen, which adopts a double-tube packaging scheme to realize the purposes of infrared emission and infrared reception.

The structure of the infrared tube is shown in fig. 2-3, and comprises a lens 9, a receiving die 7, a transmitting die 8 and a PCB 5. The lens 9 includes a light condensing portion 91 and a reflecting portion 92. The entire lens 9 is made of resin, and has a condensing portion 91 at an upper portion and a reflecting portion 92 at a lower portion. The semi-transparent and semi-reflective layer 4 is arranged in the reflective part, and has the functions of: the light emitted by the reflective emitting die 8 and reflected by the reflective surface 6 is transmitted to the transflective layer 4 and then to the reflective surface 6 by the light emitted by the receiving die 7 or incident from the outside. The transflective layer 4 may be an air gap reflective layer or a thin film reflective layer as long as the refractive index for achieving its function is satisfied. The reflection surface 6 is a total reflection surface formed by the reflection portion 92, and the total reflection can be realized by adjusting the angle of the reflection surface due to the large difference between the refractive index of the medium of the reflection portion 92 and the refractive index of the air medium. The reflecting surface 6 functions as: the light emitted by the reflective emitter die 8 or the light incident from the outside and reflected by the transflective layer 4 is then incident on the reflective surface 6.

The receiving die 7 and the transmitting die 8 are arranged on the PCB 5, and the lens 9 is arranged above the PCB 5 and covers the receiving die 7 and the transmitting die 8. In this embodiment, the transmitting die 8 is disposed below the reflecting surface 6, and the receiving die 7 is disposed below the transflective layer 4. Of course, it is also possible to use a receiving die 7 below the reflecting surface 6 and a transmitting die 8 below the transflective layer 4.

Pins of the receiving die 7 and the transmitting die 8 are welded on the PCB 5, and the PCB 5 is provided with an extraction electrode. The extraction electrode comprises a first electrode 1, a second electrode 2 and a third electrode 3.

The foregoing description of the preferred embodiment of the invention is not intended to be limiting, but rather to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the invention.

Claims

1. The surface-mounted composite infrared tube for the touch screen is characterized by comprising a lens, a receiving tube core, an emitting tube core and a PCB (printed circuit board), wherein the lens comprises a light condensing part and a reflecting part, the reflecting part is provided with a semi-transparent and semi-reflective layer and a reflecting surface, the receiving tube core and the emitting tube core are arranged on the PCB, and the lens is arranged above the PCB in a covering way and covers the receiving tube core and the emitting tube core;

the upper part of the lens is a light-gathering part, the lower part of the lens is a reflecting part, and a semi-transparent and semi-reflecting layer in the reflecting part is used for transmitting light rays emitted by the receiving tube core or incident from the outside, reflecting the light rays emitted by the emitting tube core and reflected by the reflecting surface to the outside or the light rays incident from the outside to the semi-transparent and semi-reflecting layer and then to the reflecting surface; the reflecting surface is a total reflecting surface formed by the reflecting part and is used for reflecting the light rays emitted by the emitting tube core or the light rays incident from the outside and reflected by the semi-transparent and semi-reflective layer to the reflecting surface; the transmitting tube core is arranged below the reflecting surface and the receiving tube core is arranged below the semi-transparent semi-reflecting layer, or the receiving tube core is arranged below the reflecting surface and the transmitting tube core is arranged below the semi-transparent semi-reflecting layer.

2. The surface-mounted composite infrared tube for a touch screen of claim 1, wherein the semi-transparent and semi-reflective layer is an air gap reflective layer or a thin film reflective layer.

3. The surface-mounted composite infrared tube for the touch screen according to claim 1, wherein pins of the receiving tube core and the transmitting tube core are welded on a PCB, and an extraction electrode is arranged on the PCB.