| 摘要 |
<p>1,255,374. Making electrical components; cutting by lasers. SIEMENS A.G. 1 Dec., 1969 [2 Dec., 1968], No. 58563/69. Headings B3A and B3V. [Also in Division H1] A method of manufacturing components e.g. resistors, thin film circuits and capacitors, comprises providing a carrier body with an overall layer of a material and a further coating having a non-reflective characteristic with respect to a beam of electromagnetic radiation which is used to burn off required areas of the layer of material, the coating having a thickness equal to or an odd multiple of d, where d is defined by the equation n.d= #/4 and n is the refractive index of the coating material at the wavelength # of the radiation used. A cylindrical ceramic body 1 has a carbon layer 2 and a varnish coating 3. A laser beam is focused to a point 8 on the carbon, the component body being rotated and moved axially so that a helical groove 9 is burned into the carbon. An air blast from nozzle 10 blows the molten parts of the component away from the point of burning. The coating 3 reduces the reflection of the radiation and thus accelerates the burning process. Chrome/nickel is a suggested alternative to carbon, and the coating may be of a solid fluorohydrocarbon or a phenolic resin polyesterimide varnish. The method may be used for metal, metal oxide, metal glaze layers and thin and transparent non-metal layers, e.g. of an insulating type.</p> |
