Apparatus for finishing a magnetic slider
View Patent ↗A process for finishing a disc drive slider in which a pressure generator applies multiple pressures to the back surface of one slider while the front surface of the one slider contacts a lapping surface to form a finished front surface of the slider. The slider is part of a substrate having multiple unfinished sliders formed in it. An etch process is used to etch trenches in the substrate aligned between the sliders and to form webs joining the sliders together. After the sliders are finished by lapping, the webs are removed to separate the sliders. The multiple sliders are conveniently held together during the finishing process and the etching process avoids damage to the sliders.
1. An apparatus for finishing a disc drive slider, comprising:
a multiple pressure generator adapted to apply multiple pressures to a back surface of a first disc drive slider that is joined by webs to adjacent disc drive sliders in a disc drive slider substrate;
a holding fixture for restraining the adjacent disc drive sliders;
a lapping surface arranged to lap a front surface of the first disc drive slider; and
a feedback circuit providing feedback from electrical lap guides (ELGs) in the first disc drive slider to the multiple pressure generator to control the approach of the front surface to the lapping surface.
2. The apparatus of claim 1 wherein the multiple pressures are individually controlled by the feedback from the electrical lap guides.
3. The apparatus of claim 1 wherein the holding fixture applies a vacuum to the adjacent disc drive sliders.
4. An apparatus for finishing a disc drive slider, comprising:
a holding fixture for holding a disc drive slider substrate including a first disc drive slider in contact with a lapping surface; and
means for applying multiple pressures to the back side of the first disc drive slider during lapping, and for controlling the multiple pressures by feedback from electrical lap guides in the first disc drive slider.
5. An apparatus for finishing a component, comprising:
a multiple pressure generator adapted to apply multiple pressures to a back surface of a first component that is joined by webs to adjacent components in a component substrate;
a holding fixture for restraining the adjacent components;
a lapping surface arranged to lap a front surface of the first component; and
a feedback circuit providing feedback from electrical lap guides (ELGs) in the first component to the multiple pressure generator to control the approach of the front surface to the lapping surface.
6. The apparatus of claim 5 wherein the feedback circuit is connected to electrical lap guides that are disposed at the front surface.
7. The apparatus of claim 5 wherein the feedback circuit controls a surface shape of a finished front surface based on feedback from the electrical lap guides.
8. The apparatus of claim 5 wherein the multiple pressure generator controls a direction of approach of the front surface to the lapping surface as a function of feedback from the electrical lap guides.
9. The apparatus of claim 5 wherein the multiple pressures are individually adjustable in real time, changing the profile of pressure applied from front-to-back and left-to right to vary the lapping rate in different regions of the front surface.
10. The apparatus of claim 5 wherein the multiple pressure generator controls a stripe height using feedback from the electrical lap guides.
11. The apparatus of claim 5 wherein the multiple pressure generator controls a throat height is controlled using feedback from the electrical lap guides.
12. The apparatus of claim 11 wherein the multiple pressure generator controls a stripe height using feedback from the electrical lap guides.
13. The apparatus of claim 5 wherein the lapping surface laps the first component and adjacent components independently of one another.
14. The apparatus of claim 13 wherein the lapping surface laps first component and adjacent components sequentially.
15. The apparatus of claim 13 wherein the first component and adjacent components are lapped simultaneously by multiple lapping surfaces.