Abstract: A machine for machining workpieces, for example plastic spectacle lenses, has a workpiece spindle which rotates the workpiece about a workpiece rotation axis, and a fast tool arrangement which moves a turning tool in the direction to and from the workpiece, wherein the workpiece spindle and the fast tool arrangement can moreover be moved relative to one another in a direction transverse to the workpiece rotation axis. A tool holder is connected to the fast tool arrangement and carries the turning tool. An engraving tool is spaced from the workpiece rotation axis and has an essentially point-shaped end facing towards the workpiece. The engraving tool can be moved in the direction of the workpiece and away therefrom in a highly dynamic manner via the tool holder, so that a marking can be produced on the workpiece in particular by a needling engagement of the engraving tool with the workpiece.

Abstract: The optical surface of a lens (21) held and rotated by the rotating shaft (12) of a lathe is cut or ground into an aspherical surface from a direction perpendicular to the axis of the rotating shaft (12) and the axial direction of the rotating shaft (12) while a processing locus (t) which is concentric or spiral about the rotating shaft (12) as the center is formed. In processing, the lens (21) is arranged in a grinding region (20) at a position spaced apart from the turning center (Zo) of the processing locus (t).

Abstract: The invention provides a high quality composite phosphor powder which ensures diversity in emission spectrum, color reproduction index, color temperature and color, a light emitting device using the same and a method for manufacturing the composite phosphor powder. The composite phosphor powder comprises composite particles. Each of the composite particles includes at least two types of phosphor particles and a light transmitting binder. The phosphor particles have different emission spectrums. In addition, the light transmitting binder is formed between the phosphor particles and binds them together.

Abstract: The optical surface of a lens (21) held and rotated by the rotating shaft (12) of a lathe is cut or ground into an aspherical surface from a direction perpendicular to the axis of the rotating shaft (12) and the axial direction of the rotating shaft (12) while a processing locus (t) which is concentric or spiral about the rotating shaft (12) as the center is formed. In processing, the lens (21) is arranged in a grinding region (20) at a position spaced apart from the turning center (Zo) of the processing locus (t).

Abstract: A method and apparatus for substantially nullifying vibration and deflection in a single point lens turning lathe having a rapidly reciprocating lens cutting tool and shuttle assembly. The apparatus includes three or more tool shuttles of similar mass mounted for reciprocating movement along respective generally parallel shuttle paths. The shuttles are reciprocally moveable by respective actuators along their respective shuttle paths. The shuttle and tool assemblies are moved by their respective actuators in opposite directions at a rate which causes forces generated by shuttle and tool assemblies moving in one direction to cancel forces arising from the shuttle and tool assembly movement in the opposite direction. Should an odd number of shuttle and tool assemblies be used, the amount of force generated by the mass moving in one direction may be compensated by having a different rate of movement, and hence a different stroke length from the mass moving in the opposite direction.

Abstract: An elliptical vibratory cutting apparatus includes a control mechanism which applies a sinusoidal voltage having a predetermined phase difference to piezoelectric elements. Flexure vibrations are accordingly generated in X and Y directions. The vibrations in the X direction cause interference with the vibrations in the Y direction and vice versa. An amount of interference, caused by vibrations in one direction, with vibrations in another direction, is correctively eliminated by the control mechanism (interference eliminating unit. A workpiece is thus cut by means of a cutting tool through elliptical vibrations with high precision.

Abstract: A method and apparatus for substantially nullifying vibration and deflection in a single point lens turning lathe (100) having a rapidly reciprocating lens cutting tool (114) and shuttle assembly. The apparatus includes three or more tool shuttles (108, 110, 112) of similar mass mounted for reciprocating movement along respective generally parallel shuttle paths. The shuttles (108, 110, 112) are reciprocally moveable by respective actuators (118, 120, 122) along their respective shuttle paths. The shuttle and tool assemblies are moved by their respective actuators (118, 120, 122) in opposite directions at a rate which causes forces generated by shuttle and tool assemblies moving in one direction to cancel forces arising from the shuttle and tool assembly movement in the opposite direction. Should an odd number of shuttle and tool assemblies be used, the amount of force generated by the mass moving in one direction may be compensated by having a different rate of movement, and hence a different direction.

Abstract: The present invention is a process by which optical surfaces of lenses, particularly plastic progressive lenses and molding shells for producing lenses are manufactured directly in a single step according to didicidual data. A blank from which an optical surface or a molding shell is to be manufactured is held at the workpiece carrier of a spindle axis (Z axis) of a shaping machine and is directly turned into its final form by a turning tool which can move relative to the blank (in the X axis), i.e., transversely to the direction of displacement of the tool. During each rotation of the spindle, the turning tool is incrementally adjusted towards or away from the blank depending on the characteristic surface data, which may be predetermined or calculated on-line.