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Proceedings Paper

Searching for CD-R process window for different phthalocyanine dyes
Author(s): Huiping Pu; Shiyong Wang; Kent C. M. Lee
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Paper Abstract

It becomes more and more important to search for a suitable process window for CD-R production because CD-R's performance will vary with the thickness of the recording material (dye layer). With the development of CD-R writer, it is strongly recommended that CD-R should be compliance with multi-speed recording strategy. For different kinds of dyes, we need to re-design the pre-groove geometry of stampers and dye/solvent formulation for getting good CD-R's performance. In the meanwhile we need to use different methods to search for the process window according to the characteristics of the dye. For the Irgaphor Green phthalocyanine dye, BLER will increase with the reducing thickness of the dye layer at lower writing speeds; Jitter will increase with increasing thickness of the dye layer at high writing speeds. So we define the process window as the optical density when BLER is 100 at low writing speed and L3T Jitter is 35 ns at high writing speed. For the Irgaphor Supergreen phthalocycnine dye, BLER is not sensitive to the thickness of dye layer and normally I11 is too low at lower writing speeds. After finalizing a stamper, we increase I11 by increasing the thickness of the dye layer and decrease L3T jitter by decreasing the thickness of dye layer. So we define the process window as the optical density when I11 is 0.58 V at low writing speed and L3T Jetter is 35 ns at high writing speed. The temperature and humidity have certain effect on the dye layer thickness, the process control is benefited by the wider process window. Using the above methods, we could easily establish the CD-R process window and set the optimum dye layer thickness during the CD-R production with the Ciba phthalocyanine dyes.

Paper Details

Date Published: 7 February 2001
PDF: 6 pages
Proc. SPIE 4085, Fifth International Symposium on Optical Storage (ISOS 2000), (7 February 2001); doi: 10.1117/12.416866
Show Author Affiliations
Huiping Pu, Linfair Engineering Co., Ltd. (Hong Kong)
Shiyong Wang, Linfair Engineering Co., Ltd. (China)
Kent C. M. Lee, Ciba Speciality Chemicals Ltd. (China)


Published in SPIE Proceedings Vol. 4085:
Fifth International Symposium on Optical Storage (ISOS 2000)

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