Method for manufacturing hyperbolic surface
AssigneeMachida Endoscope Co., Ltd.
InventorsHaruhiko Machida, Hiroshi Kobayashi
Life of this patent
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Abstract
An optical lens having a hyperboloid surface is formed by cutting or grinding a workpiece made of glass or plastics while rotating it about its axis, while a cutting or grinding tool having a linear working edge is rotated or swung about a central axis, the working edge is separated from the center axis by a given distance and is inclined with respect to the central axis by a given angle. The envelope of the working edge forms a hyperboloid of one sheet of revolution along which the workpiece is cut or ground. An eccentricity of the hyperboloid curve can be adjusted by changing the inclined angle of the working edge with respect to the central axis.
Claims10
A method for manufacturing a hyperbolic surface on a workpiece comprising:
- securing a workpiece to be processed to a workpiece holding section;
- securing a shaping tool having a straight working edge to a tool holding section in such a manner that the working edge is separated from a central axis by a given distance and is inclined with respect to the central axis by a given angle;
- moving the tool about said central axis;
- moving the tool holding section and the workpiece holding section relative to each other;
- and
- shaping the workpiece by the working edge of the tool into a hyperbolic surface along a hyperbolic locus formed by the working edge.
An apparatus for manufacturing a hyperbolic surface by shaping a workpiece comprising
- a base;
- an X-axis sliding member slidably mounted on the base in an X-direction;
- a Y-axis sliding member slidably mounted on the X-axis sliding member in a Y-direction perpendicular to the X-direction;
- a X-axis sliding member slidably mounted on the Y-axis sliding member in a Z-direction perpendicular to the X- and Y-directions;
- a working tool holding member extending in the Z-direction and rotatable about a central axis;
- a working tool secured to an end portion of the working tool holding member and having a straight working edge which is separated from the central axis by a given distance and is inclined with respect to the central axis by a given angle;
- means for holding a workpiece to be shaped;
- means for rotating the workpiece about an axis extending in the X-direction;
- means for rotating or swinging the working tool holding member about the central axis;
- and
- means for sliding the X-axis, Y-axis and Z-axis sliding members.
Dependencies are inferred from the claim text.