| 发明名称 |
INFORMATION REPRODUCTION DEVICE |
| 摘要 |
PURPOSE:To raise optical modulation ratio by varying diameter in the direction crossing the recording track of an optical beam spot in accordance with the increase and dicrease of recording information per unit length of the track in an optical video disk. |
| 申请公布号 |
JPS52153405(A) |
申请公布日期 |
1977.12.20 |
| 申请号 |
JP19760070766 |
申请日期 |
1976.06.15 |
| 申请人 |
MITSUBISHI ELECTRIC CORP;TEAC CORP |
发明人 |
NAGAI TADAO;OKADA KAZUO;HIRASAWA KAZUO |
| 分类号 |
H04N5/85;G11B7/08;G11B7/125;H04N5/84 |
主分类号 |
H04N5/85 |
| 代理机构 |
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代理人 |
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