초록 ▼

An inventive method of manufacturing precisely-compressed multi-layer stacks is presented. Two stacks are assembled. One stack, having a compression sensor between two layers, is then compressed with an initial compression force, and the signal from the sensor is measured. The other stack is then co

An inventive method of manufacturing precisely-compressed multi-layer stacks is presented. Two stacks are assembled. One stack, having a compression sensor between two layers, is then compressed with an initial compression force, and the signal from the sensor is measured. The other stack is then compressed with a force derived from the measurement.

대표청구항 ▼

1. A method of making multi-layer stacks comprising steps of: (a) positioning at least one sensor between a first layer and a second layer; (b) assembling a first stack by inserting a first axial member through the first layer and the second layer; (c) assembling a second stack by inserting a s

1. A method of making multi-layer stacks comprising steps of: (a) positioning at least one sensor between a first layer and a second layer; (b) assembling a first stack by inserting a first axial member through the first layer and the second layer; (c) assembling a second stack by inserting a second axial member through a third layer and a fourth layer; (d) compressing the first and second layers toward one another with a predetermined force; (e) receiving a sensor signal from the at least one sensor; (f) deriving a force value from the received sensor signal; (g) compressing the third and fourth layers toward one another with the force value derived from the sensor signal received in step (f); (h) clamping the second axial member while urging the third and fourth layers toward one another; and (i) repeating steps (a), (b), (d) and (e) to generate a plurality of received signals and deriving at least one test criterion from the received signals by steps comprising: (i1) extracting a measured equilibrium clamped compression force value from each of the several received signals; (i2) calculating a mean and a standard deviation of the extracted values; and (i3) using the mean minus 7 × S.D. as a minimum acceptable ECC value, thereby defining the at least one test criterion. 2. The method of claim 1, further comprising, after step (c) but before step (g), a step (i) of clamping the axial member while urging the first and second layers toward one another, the clamping step (i) comprising a sub-step (i1) of waiting about 5 to 10 seconds. 3. The method of claim 1, further comprising a step (m) of assembling the second stack into a disc drive. 4. The method of claim 1 in which at least part of compressing step (d) and at least part of receiving step (e) occur simultaneously. 5. The method of claim 1 in which positioning step (a) comprises a sub-step of (a1) affixing the at least one sensor to one of the layers. 6. The method of claim 5 in which the one of the layers comprises a surface defining a hole, the method comprising a step of distributing a plurality of sensors around the hole. 7. The method of claim 1, further comprising steps of: (j) positioning at least one supplemental sensor between a fifth layer and a sixth layer; (k) assembling a third stack by inserting a third axial member through the fifth layer and the sixth layer; (l) compressing the fifth and sixth layers toward one another with the derived force; (m) recording a measurement derived from a signal from the at least one supplemental sensor of the third stack as a quality-indicative statistic of the second stack; and (n) preserving the second stack only if the statistic meets the at least one test criterion. 8. The method of claim 1, further comprising steps of: (i) positioning at least one sensor between a fifth layer and a sixth layer; (j) assembling a third stack by inserting a third axial member through the fifth layer and the sixth layer; (k) compressing the fifth and sixth layers toward one another with the derived force; (l) recording a measurement derived from a signal from the at least one sensor of the third stack as a quality-indicative statistic of the second stack; and (m) preserving the second stack only if the statistic meets at least one predetermined criterion. 9. The method of claim 8, further comprising a step (n) of assembling the second stack into a disc drive. 10. The method of claim 1, in which the first and third layers are information storage discs.