Method and device for producing rod lenses
Assigneej-plasma GmbH
InventorsLothar Brehm, Frank Coriand, Wolfgang Schmidt, Ulrich Strobel
Life of this patent
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Abstract
A method for producing rod lenses with an enveloping diameter of the rod lens face of up to 200 mm and an edge length of at least 800 mm. The method is characterized in that fabrication is performed from a cylindrical rod lens element made from synthetic quartz glass material configured as a fused silica ingot. This is performed using a flame hydrolysis method with a direct one stage deposition process of SIOx particles from a flame stream onto die that rotates and is moveable in a linear manner with respect to the flame stream.
Claims21
A method for producing rod lenses with an enveloping diameter of a rod lens face of up to 200 mm and an edge length of at least 800 mm, comprising directly fabricating the rod lenses from a cylindrical fused silica ingot element prepared by generating synthetic quartz glass material SiOx particles in a flame hydrolysis nozzle and depositing the particles onto a rotating die in a direct, one-stage deposition process, and moving the rotating die away from the flame hydrolysis nozzle in a linear fashion with respect to a flame stream from the nozzle such that the distance from the flame of the flame stream and a surface of a forming silica glass layer on the ingot remains constant, wherein the fused silica ingot is free of bubbles, layers, inclusions, and cords over the edge length of the rod lens.
A method for producing a cylindrical rod ingot suitable for directly producing a rod lens, comprising generating synthetic quartz glass material SiOx particles in a flame hydrolysis nozzle and depositing the particles onto a rotating die in a direct, one-stage deposition process, and moving the rotating die away from the flame hydrolysis nozzle in a linear fashion with respect to a flame stream from the nozzle such that the distance from the flame of the flame stream and a surface of a forming silica glass layer on the ingot remains constant, wherein the cylindrical rod element is free of bubbles, layers, inclusions, and cords over a length of at least 800 mm.
A method for producing rod lenses with an enveloping diameter of a rod lens face of up to 200 mm and an edge length of at least 800 mm, comprising:
- directly fabricating the rod lenses from a cylindrical fused silica ingot element prepared by generating synthetic quartz glass material SiOx particles in a flame hydrolysis nozzle and depositing the particles onto a rotating die in a muffle oven in a direct, one-stage deposition process;
- providing a uniform muffle oven temperature of 1000° C. to 1300° C. during the deposition process;
- keeping a constant distance between a melting surface of the deposited fused silica ingot and an inner wall of the muffle oven;
- and
- moving the rotating die away from the flame hydrolysis nozzle in a linear fashion with respect to a flame stream from the nozzle such that the distance from the flame of the flame stream and a surface of a forming silica glass layer on the ingot remains constant, wherein the fused silica ingot is free of bubbles, layers, inclusions, and cords over the edge length of the rod lens.
Dependencies are inferred from the claim text.