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US 4,498,345 AGranted
Method for measuring saw blade flexure
AssigneeTexas Instruments Incorporated
InventorsLawrence D. Dyer, Anderson D. McGregor
Life of this patent
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Abstract
A system for measuring the flexure of a saw blade in situ includes in one embodiment a non-contact displacement sensor and means for directing a fluid flow at the blade adjacent the sensor. The deflection of the blade by the fluid flow is detected by the sensor which generates a signal related to blade flexure. The system indicates when a saw blade is correctly tensioned or when retensioning is required.
Claims1
A method for measuring the flexure of an internal diameter saw blade suitable for slicing wafers from a semiconductor crystal, comprising the steps of:
- positioning sensor means adjacent the cutting edge of the saw blade for generating an output signal proportional to the the displacement of the blade in a direction normal to the plane of the blade;
- directing a stream of air at the saw blade adjacent the sensor, while the saw blade is rotating, to displace the blade from its steady state position;
- measuring the deflection of the saw blade by measuring the change in the sensor output, wherein the flexure of the saw blade can be determined;
- and
- periodically repeating said directing and measuring steps to determine whether the blade flexure falls within a predetermined limit.
2 more elements
Dependencies are inferred from the claim text.