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Track Pitch Measurements
There are many challenges in manufacturing discs in the
new high density (DVD) format. Mastering and replication equipment must
now support both the CD and DVD formats. A number of companies in the CD
industry have identified track pitch as one area of particular concern
because track pitch errors such as incorrect mean value and excessive jitter
(range) may cause playback problems. This makes customers unhappy and results
in costly returns. Until now there has been no adequate test method for
DVD track pitch.
DiscTrack Plus? directly measures track pitch on compact discs
using scanning probe microscope images. It tabulates individual values
of track pitch. Quantitative graphs and statistical parameters give a firm
basis for assessing disc quality and allow you to decide whether a disc
passes or fails the track pitch specification. For example, both Disc 1
and Disc 2 had mean track pitch within the specified window (0.74 +/- 0.01
mm), but the range of pitch values for Disc
1 exceeded the specification (0.74 +/- 0.03 mm).
Results for the calibration standard show that individual features can
be measured with a precision of 1 nm.
(mean = 744 nm, std. dev. = 27 nm)
(mean = 736 nm, std. dev. = 6.8 nm)
(mean = 288 nm, std. dev. = 1.1 nm)
Who needs DVD and CD track pitch information?
Anyone who is concerned about playback quality. Manufacturers
of discs, disc production equipment
(such as laser beam recorders and replication presses), and disc players
are all concerned about track pitch. Track pitch errors create noise and
signal distortion, leading to data errors. By knowing whether track pitch
is under control (and quantitatively how well it is controlled), you can
make a wiser purchasing decision, optimize your process more quickly,
and assure consistent performance.
We provide Disc Track Plus? Measurement Systems for companies
with Atomic Force Microscopes, or Disc Track Plus? Measurement Services for
companies without AFM's or who need additional outside assistance.
DiscTrack Plus? Measurement System
Overview. DiscTrack Plus? software can be installed on existing Scanning Probe (Atomic Force) Microscopes or on any Windows PC. You can now get high accuracy measurements of track pitch. You will be able to easily distinguish between discs of different quality. The precise, quantitative results will help you decide which disc meets specifications and which disc fails. The complete DiscTrack Plus? system includes the following components:
Software features and benefits:
You can also get high accuracy measurements of track pitch using our measurement services. You will be able to easily distinguish between discs of different quality using our comprehensive report of pitch results. These precise, quantitative results will help you decide which discs meet specifications and which discs fail.
We recommend capturing sufficient AFM images to include 100-120 individual measurements of track pitch. This may require 6-10 images. On DVD, we often measure 2 nearby 10-um images at each of 5 different radial positions on a stamper.
Service Benefits and features:
What is a Scanning Probe Microscope(SPM)?
An SPM is an instrument which uses a physical probe to trace the hills
and valleys of a surface, producing a high magnification 3-D image. The
Atomic Force Microscope(AFM) is one type of SPM.
Corporate profile. Advanced Surface Microscopy,
Inc. is an independent analytical service and research laboratory. Since
1991, we have been helping many companies in the disc industry to solve
materials and processing problems. Our proprietary DiscTrack? technology
was developed to meet your industry's needs.
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