1995 Fiscal Year Final Research Report Summary
Research for lensless optical head and a new optical disk system
| Project/Area Number |
06452234
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| Research Category |
Grant-in-Aid for General Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Research Field |
電子デバイス・機器工学
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| Research Institution | School of High-Technology for Human Welfare, Tokai University |
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Principal Investigator |
GOTO Kenya School of High-Technology for Human Welfare, Tokai Univ., Professor, 開発工学部, 教授 (20234982)
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| Co-Investigator(Kenkyū-buntansha) |
TIBA Masafumi School of High-Technology for Human Welfare, Tokai Univ., Lecturer, 開発工学部, 講師 (70236818)
SASAKI Masami School of High-Technology for Human Welfare, Tokai Univ., Associate Prof., 開発工学部, 助教授 (40235271)
OKI Makoto School of High-Technology for Human Welfare, Tokai Univ., Lecturer, 開発工学部, 講師 (50224126)
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| Project Period (FY) |
1994 – 1995
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| Keywords | lensless head / laser chip / bare chip / anti-reflection coat / phase change medium / optical floppy disk / aero-dynamics / ECR sputtering |
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| Research Abstract |
A laser diode chip, of which output edge-facet is coated by an anti-reflection film has been used as a functional device for a lensless optical reading head in a new type of optical floppy disk system. The new optical head consists of the laser chip and a high speed photo diode. They are all die-bonded on one pair of heat sink metal which also works as a pair of electrodes supplying the injection current to the laser diode.
In the writing experiments the distance between the optical head and the optical disk medium was kept to nearly constant within 1 mu m. Using InSbTe phase changemedium and an 830nm laser diode chip we succeeded in information bits recording with laser peak power of 8mW and pulse width of 1 mu s which was used to cool the medium slowly in order to convert the surface from amorphous state to crystal state.
In reading experiments laser oscillation switching had been observed according to Fresnal reflection, that is high for crystal state and low for amorphous state.
In the gap control experiments magnitude of the floppy disk deflection decreased to within <plus-minus>0.15 mu m with a certain conditio
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