Patent ID: 6963072

Claim:
A method for producing lenses for transforming radiation representing a neutral or charged particle flux, including radiation transporting channels with the use of a total external reflection in them, having two or more stages of stocks which produce, at each stage, a tubular envelope filled with earlier made stocks, wherein thin-walled capillaries are used at a first stage, and at each further stage the stocks are used for subsequent stages to complete a product, the method comprising: the stocks, resulting from a given stage, are produced by cutting the product, emerging from the furnace, lengthwise, wherein at an end of the stage of stocks a tubular envelope is filled with the stocks, obtained at this stage, and they are jointly drawn in the furnace at a feed speed maintained slower than an exit speed of the product from the furnace, and a relationship between the feed speed and exit speed of the product is periodically changed to form barrel-shaped thickenings on the product emerging from the furnace, then lenses as parts of the product are produced from the product by cutting it lengthwise, and the lenses include only one thickening, wherein at all stages the tubular envelopes, made of a same material as the capillaries, or a material having substantially the same thermal extension coefficient, are used and the processes of the tubular envelopes drawing with the stocks, filling the envelopes, occurs while a pressure of the gaseous medium in the space between them is less than the pressure inside channels of the stocks, at a temperature of the material that softens and splices neighboring stocks.