Optical touch module

Abstract

The invention discloses an optical touch module, comprising a touch surface, a substrate, at least one optical sensor, a light guide structure, an elastic element and a light emitting unit. The touch surface is positioned on the substrate, the optical sensor captures the image of a touch zone towards the touch surface; the light guide structure is arranged along one side of the touch surface to guide light into the touch surface. The elastic element is arranged at one end part of the light guide structure. The light emitting unit is arranged between the light guide structure and the elastic element, and is butted against the elastic element to allow the light exit surface of the light emitting unit to be closely adjacent to the light incoming surface of the light guide structure substantially. Therefore, the optical touch module provided by the invention can solve the problem that gaps appear between the light emitting unit and the light guide structure due to that the light guide structure has structural distortion caused by expansion on heating and contraction on cooling under different use environments, provides good assembling effect and effectively eliminate light leakage problem.

Description

technical field [0001] The present invention relates to an optical touch module, in particular to a device that utilizes the elastic force provided by the elastic member to make the light-emitting unit close to the light guide structure and uses a light-shielding structure to block the light reflected from the light guide structure. Optical touch module. Background technique [0002] Generally speaking, the optical touch module uses the light receiving and blocking principle to detect the relative position of the finger or stylus on the touch surface. Its components include a substrate, a light-emitting unit, an optical sensor, and a guide. The common configuration of the light structure is that the light guide structure is arranged along the side of the touch surface on the substrate, the light emitting unit is arranged on the substrate corresponding to the light incident surface of the light guide structure, and the optical sensor It is arranged at the position correspond...

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Problems solved by technology

[0003] However, in actual use, due to the thermal expansion and contraction of the light guide structure under different use environments, the structural deformation will cause an unnecessary gap between the light-emitting unit and the light guide structure. Therefore, this gap will cause the light to emit light The light emitted by the unit is reflected when it is incident on the light incident surface of the light guide structure, so that the light can only partially enter the light guide structure. That is to say, the configuration design adopted above often makes the optical touch module The problem of light reflection and light leakage occurs at the installation position of the light-emitting unit, which affects the accuracy of the optical sensor in judging the change of light intensity. In addition, when the light leakage is serious, it may even cause the optical touch module to fail to touch There is a problem of touch failure at a certain position in the surface

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