Improvements of optical, mechanical, and geometrical properties of DVD-RAM substrate

S. Moon, K. Seong, H. Kim, Shinill Kang, J. S. Lee, D. Lee

Research output: Contribution to journalConference article

1 Citation (Scopus)

Abstract

It is necessary to improve optical, geometrical, and mechanical properties in the optical disk substrates as the information storage devices with high storage density using short wavelength lasers are being developed. However, the conventional injection molding process is no longer appropriate for producing the high-density information storage optical disk substrates with superb optical, geometrical, and mechanical properties. It is, therefore, inevitable to develop new concepts for the molding processes. In the present study, DVD-RAM substrates were fabricated by injection-compression molding, which is regarded as the most suitable process to manufacture optical disk substrates. The effects of various processing conditions on the birefringence distribution, the land-groove structure including the groove depth and the surface roughness of the land, and the radial tilt were examined experimentally. It was found that the birefringence, which is regarded as one of the most important optical properties for optical disk, was very sensitive to the mold wall temperature history. Also, the integrity of the replication, represented by the land-groove structure, and the radial tilt were influenced mostly by the mold temperature and the compression pressure.

Original languageEnglish
Pages (from-to)306-310
Number of pages5
JournalProceedings of SPIE - The International Society for Optical Engineering
Volume4085
DOIs
Publication statusPublished - 2001 Jan 1
Event5th International Symposium on Optical Storage (ISOS 2000) - Shanghai, China
Duration: 2000 May 222000 May 26

Fingerprint

Videodisks
optical disks
Random access storage
Substrate
mechanical properties
grooves
optical properties
Substrates
Birefringence
Data storage equipment
Injection molding
Molding
birefringence
Tilt
Mechanical Properties
Mechanical properties
Compression
injection molding
Compression molding
wall temperature

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering

Cite this

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abstract = "It is necessary to improve optical, geometrical, and mechanical properties in the optical disk substrates as the information storage devices with high storage density using short wavelength lasers are being developed. However, the conventional injection molding process is no longer appropriate for producing the high-density information storage optical disk substrates with superb optical, geometrical, and mechanical properties. It is, therefore, inevitable to develop new concepts for the molding processes. In the present study, DVD-RAM substrates were fabricated by injection-compression molding, which is regarded as the most suitable process to manufacture optical disk substrates. The effects of various processing conditions on the birefringence distribution, the land-groove structure including the groove depth and the surface roughness of the land, and the radial tilt were examined experimentally. It was found that the birefringence, which is regarded as one of the most important optical properties for optical disk, was very sensitive to the mold wall temperature history. Also, the integrity of the replication, represented by the land-groove structure, and the radial tilt were influenced mostly by the mold temperature and the compression pressure.",
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Improvements of optical, mechanical, and geometrical properties of DVD-RAM substrate. / Moon, S.; Seong, K.; Kim, H.; Kang, Shinill; Lee, J. S.; Lee, D.

In: Proceedings of SPIE - The International Society for Optical Engineering, Vol. 4085, 01.01.2001, p. 306-310.

Research output: Contribution to journalConference article

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T1 - Improvements of optical, mechanical, and geometrical properties of DVD-RAM substrate

AU - Moon, S.

AU - Seong, K.

AU - Kim, H.

AU - Kang, Shinill

AU - Lee, J. S.

AU - Lee, D.

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AB - It is necessary to improve optical, geometrical, and mechanical properties in the optical disk substrates as the information storage devices with high storage density using short wavelength lasers are being developed. However, the conventional injection molding process is no longer appropriate for producing the high-density information storage optical disk substrates with superb optical, geometrical, and mechanical properties. It is, therefore, inevitable to develop new concepts for the molding processes. In the present study, DVD-RAM substrates were fabricated by injection-compression molding, which is regarded as the most suitable process to manufacture optical disk substrates. The effects of various processing conditions on the birefringence distribution, the land-groove structure including the groove depth and the surface roughness of the land, and the radial tilt were examined experimentally. It was found that the birefringence, which is regarded as one of the most important optical properties for optical disk, was very sensitive to the mold wall temperature history. Also, the integrity of the replication, represented by the land-groove structure, and the radial tilt were influenced mostly by the mold temperature and the compression pressure.

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