Development of Injection Molding of an High Density Optical Disk by Rapid Heating Stamper
Project/Area Number |
07555217
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Research Category |
Grant-in-Aid for Scientific Research (A)
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Allocation Type | Single-year Grants |
Section | 試験 |
Research Field |
Material processing/treatments
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Research Institution | Tokyo Institute of Technology |
Principal Investigator |
KATO Kazunori Tokyo Institute of Technology, Department of Mechanical Engineering and Science, Professor, 工学部, 教授 (80016419)
|
Co-Investigator(Kenkyū-buntansha) |
YOSHII Masaki HITACHI,Ltd.Production Engineering Research Laboratory, Senior Researcher, 生産技術研究所, 主任研究員
|
Project Period (FY) |
1995 – 1996
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Project Status |
Completed (Fiscal Year 1996)
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Budget Amount *help |
¥8,400,000 (Direct Cost: ¥8,400,000)
Fiscal Year 1996: ¥3,000,000 (Direct Cost: ¥3,000,000)
Fiscal Year 1995: ¥5,400,000 (Direct Cost: ¥5,400,000)
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Keywords | Injection molding / Precise transcription / Nickel plated ceramic stamper / Direct current heating / Optical disk / 転写性向上 / 光ディスク / 転写性 / ニッケルメッキ / 急加熱スタンパ |
Research Abstract |
In injection molding of an optical disk, precise minute pit pattern is transcripted from that on a nickel stamper of 0.3mm thickness. However various defects, i.e.miss-transcription, multiple transcription, flow-mark, etc.are sometimes generated. These defects reduce with increasing die temperature, but cooling efficiency of a product decreases and molding cycle time become long. In this paper a model stamper, on which thin nickel film is plated and heated by direct current, is developed. Then, transcription behavior is examined. A rapid heating stamper model is made. Its size is 100mm in length, 10mm in width, and 5mm in thickness. A thin nickel layr of 10mum thickness is plated on AIN (aluminum nitride) ceramic plate and annealed at 400゚C temperature in 15 minutes. Then the surface is finished by buffing. Then Electrodes was put on its both ends and electric power of 10V and 12A is applied to the nikkel layr. Surface temperature is measured by thermo-couple. Temperature rise of 65゚C is obtained in 1.5 seconds after power-on and 50゚C temperature drop in 5 seconds after power-off. In injection molding with the model stamper, heat-starting time (t_0) and heat-holding tiem (DELTAt) are changed. "t_0=0" is defined as injection-starting time. On the surface of a stamper many fine scratches are observed. In injection molding without heating. transcription of scratch is not clear. It means that the transcription is incomplete. When appropriate heating is applied (t_0=-ls, DELTAt=2s), scratches are transcripted clearly. In the case of long heating (t_0=0s, DELTAt=3s), voids are generated because of high temperature.
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Report
(3 results)
Research Products
(11 results)