Patent ID: 6780085
Filing Date: 2004-08-24
Classification: B24B

Abstract:
An apparatus for electronic wafer chemical-mechanical-planarization table process monitoring comprising:a. a polishing pad and a hub; b. the polishing pad having a polishing surface and an attachment surface and containing an embedded waveguide with an outer lens fixture end with a means for delivering light and a light coupling transparent center fixture end; c. the waveguide is arranged within the pad interior such that the transparent center fixture end and outer lens fixture end is embedded within a recess on the pad polishing surface such that the ends are located on the pad polishing surface; d. the waveguide is arranged within the pad interior such that the transparent center fixture end is at the center of rotation of the polishing pad and the outer lens fixture end is at a location within the wafer track wherein when opposite a wafer contacting the surface of the polishing pad, a light delivery means provides light to and receives surface reflectance from the wafer; e. the hub contains a moving portion and a stationary portion rotatably connected and arranged such that the moving portion positions the stationary portion wherein light may be transmitted from the hub stationary portion to the waveguide transparent center fixture end and light may be transmitted from the waveguide transparent center fixture end to the hub stationary portion; and f. means for light conductance between the hub stationary portion and stationary portion of the table CMP tool.