发明名称 |
INFORMATION RECORDING ORIGINAL DISK BEING FURNISHED WITH PATTERN FOR D ETECTING FOCUS POSITION |
摘要 |
PURPOSE:To speed up and simplify the detection of the focus position, by setting up several lines to the direction crossed by the light spot, regarding the recording original disk which records the information by making the sensitive body with the applied face expose to the light by the light by the spot of the modulated light. |
申请公布号 |
JPS5265404(A) |
申请公布日期 |
1977.05.30 |
申请号 |
JP19750142679 |
申请日期 |
1975.11.26 |
申请人 |
MATSUSHITA ELECTRIC IND CO LTD |
发明人 |
KASHIHARA TOSHIAKI;OKINO YOSHIHIRO;NISHINO SEIJI |
分类号 |
G11B7/26;G11B7/09 |
主分类号 |
G11B7/26 |
代理机构 |
|
代理人 |
|
主权项 |
|
地址 |
|