平板の曲げの解を用いた光ディスク反り検査手法
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概要
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Tilt inspection is getting more and more importat in the replication process of optical disks such as CD-ROMs, DVDs, etc. to ensure high speed disk drives. In this work, a solution of the bending equation for a circular flat plate is applied to the conventional optical disk tilt inspection. The warped shape of an optical disk is expressed well in this solution. This makes the following new applications. (1)The disk shape is expressed in a simple expansion series. This enables to record the shape of every inspected disk by only using several coefficients. (2)Checking a series of coefficients of every disk enables to detect each disk's particular shape in a production lot. (3)Estimation of temperature distribution, axial acceleration and deflection is simple using only a few sensors in fixed radial positions. (4)Detection of imperfectly bonded spots of DVDs is possible, …, and so on.
- 2000-09-25