发明名称 |
OPTICAL SYSTEM |
摘要 |
<p>An optical system had an objective lens for focussing on a dotted information carrying video disc the light emitted from a light source of semiconductor laser whose radiant region has different longitudinal and lateral dimensions, and a coupling lens disposed between the objective lens and the laser source for condensing the light from the laser source. The coupling lens has a magnification factor of not greater than 7.</p> |
申请公布号 |
CA1109961(A) |
申请公布日期 |
1981.09.29 |
申请号 |
CA19780311309 |
申请日期 |
1978.09.14 |
申请人 |
HITACHI, LTD. |
发明人 |
KATAOKA, KEIJI;YONEZAWA, SEIJI |
分类号 |
G02B27/09;G11B7/135;(IPC1-7):11B7/00 |
主分类号 |
G02B27/09 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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