| 摘要 |
<p>1441650 Cutting glass with laser GLAVERBEL-MECANIVER 8 Oct 1973 [12 Oct 1972] 46880/73 Heading C1M In severing vitreous or vitrocrystalline sheet material, the sheet material is scored along substantially the entire length of a required predetermined cutting line, and then thermal forces sufficient to sever the sheet are induced in the sheet by irradiating along the predetermined scored line with at least one laser beam. Two or more laser beams of different wavelength may be used. The scoring may be carried out with a conventional tool (e.g. a diamond or tungsten carbide tool), but preferably using a low scoring tool loading (e.g. less than 1 kg.). In one embodiment, a continuous glass ribbon 1 (which may be drawn or float glass emerging from an annealing lehr) is carried on rollers 2 beneath arm 3. Mounted on arm 3 is a carriage 4 which may be driven by motor 5. Mounted on carriage 4 is a scoring tool 8. A laser beam 10 produced by source 9 (e.g. a CO 2 laser of wavelength 10À6 microns) is reflected by devices 11 and 12, and focused by lens 13 on to the line scored by tool 8. The carriage 4 travels along arm 3, the glass being first scored by tool 8 and then severed by laser beam 10, and the carriage speed being controlled so that the ribbon 1 is transversely severed. In an alternative embodiment (Fig. 3, not shown), a glass ribbon moves continuously past stationary scoring tools and laser beams, marginal edge portions of the ribbon being continuously removed by successive scoring and irradiation.</p> |
