Laser cutting device and laser cutting method

Abstract

The invention relates to a laser cutting device which comprises a laser generating unit, a cooling nozzle, a first image pick-up unit, a second image pick-up unit and an image processing unit. The laser generating unit is used for generating a laser beam. The cooling nozzle is used for generating a cooling medium. The first image pick-up unit comprises a first light source and a first image sensor, and the second image pick-up unit comprises a second light source and a second image sensor. The first light source and the second light source can selectively emit light beams, the light beams emitted by the first light source and the second light source are respectively irradiated on a blind crack from both opposite sides of the blind crack, and the first image sensor and the second image sensor are used for correspondingly sensing the light beams emitted by the first light source or the second light source and reflected on the blind crack to obtain the image of the blind crack. The imageprocessing unit is used for comparing the image of the blind crack with the image of a pre-stored reference blind crack to detect whether the blind crack reaches the preset depth or not.

Description

technical field [0001] The invention relates to a laser cutting device, in particular to a laser cutting device for cutting a panel, and a laser cutting method using the laser cutting device. Background technique [0002] During the manufacturing process of a flat display device, such as a liquid crystal display (Liquid Crystal Display, LCD), it is usually necessary to cut a large panel, such as a glass substrate, to obtain multiple small panels of required size. The above-mentioned cutting process generally includes the following steps: heating the large panel according to the size requirements of the small panel; cooling the heated area to generate blind cracks (blink crack), and separating the required small panel mechanically or manually. [0003] In the prior art, when cutting a large panel, it is necessary to confirm whether the blind crack has reached a predetermined depth, for example, the blind crack usually needs to reach a predetermined depth, otherwise, when the ...

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Problems solved by technology

[0003] In the prior art, when cutting a large panel, it is necessary to confirm whether the blind crack reaches a predetermined depth, for example, the blind crack usually needs to reach a predetermined depth, otherwise, when the small panel is separated mechanically or manually , the small panel is prone to burrs or other cutting marks (laser marks), resulting in low precision and difficult to meet the needs of industrial production

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