| 发明名称 |
SINGLE LENS HAVING ONE ASPHERICAL SURFACE |
| 摘要 |
<p>22 "Single lens having one aspherical surface." A single lens is described for the formation of a scanning spot on an information surface of a transparent record-carrier substrate. The lens has one aspherical surface and one spherical or plane surface. The curvatures of the lens surfaces and the thickness of the lens are such that a compensation is obtained for aberrations caused by the substrate.</p> |
| 申请公布号 |
CA1255527(A) |
申请公布日期 |
1989.06.13 |
| 申请号 |
CA19840469398 |
申请日期 |
1984.12.05 |
| 申请人 |
N.V.PHILIPS'GLOEILAMPENFABRIEKEN |
发明人 |
BRAAT, JOSEPHUS J.M.;SMID, ALBERT |
| 分类号 |
G02B13/00;G02B3/04;G02B13/18;G11B7/135;(IPC1-7):G02B3/04 |
主分类号 |
G02B13/00 |
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