Optical pickup device
文献类型：专利
| 作者 | YAMANAKA HARUYOSHI |
| 发表日期 | 1989-09-11 |
| 专利号 | JP1989227234A |
| 著作权人 | MATSUSHITA ELECTRIC IND CO LTD |
| 国家 | 日本 |
| 文献子类 | 发明申请 |
| 其他题名 | Optical pickup device |
| 英文摘要 | PURPOSE:To reduce the slippage of a focusing point at writing and reading times and to prevent the generation of a signal error by combining the lens system having a color aberration and semiconductor laser having an astigmatic difference. CONSTITUTION:A semiconductor laser is reduced at its astigmatic difference when its optical output is increased and, on the other hand, the wavelength is moved to a long wave length side and the focusing point is slided together by the color aberration of a lens system. For instance, when the optical output of the writing and reading laser 1 to an optical disk 4 is taken in 15mW and 2.5mW, a 2-3nm wavelength is moved by switching and the slippage of the focusing point by color aberration becomes in 2-3mum. The astigmatic difference is reduced in 2-3mum in case of the astigmatic difference of 5mum being in 15mW in case of <=5mW optical output. The slippage of the focusing point by the movement of an oscillating wavelength is combined so as to absorb it by the fluctuation of the astigmatic difference. The slippage of the focusing point at writing and reading times is thus reduced and the signal error can be eliminated. |
| 公开日期 | 1989-09-11 |
| 申请日期 | 1988-03-08 |
| 状态 | 失效 |
| 源URL | [http://ir.opt.ac.cn/handle/181661/68975]  |
| 专题 | 半导体激光器专利数据库 |
| 作者单位 | MATSUSHITA ELECTRIC IND CO LTD |
| 推荐引用方式 GB/T 7714 | YAMANAKA HARUYOSHI. Optical pickup device. JP1989227234A. 1989-09-11. |
入库方式： OAI收割
来源：西安光学精密机械研究所
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