发明名称 |
ASPHERICAL SURFACE LENS |
摘要 |
A single lens is described for forming 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 selected to compensate for aberrations caused by the substrate. |
申请公布号 |
AU3635284(A) |
申请公布日期 |
1985.06.13 |
申请号 |
AU19840036352 |
申请日期 |
1984.12.06 |
申请人 |
PHILIPS:, N.V., GLOEILAMPENFABRIEKEN |
发明人 |
JOSEPHUS JOHANNES MARIA BRAAT;ALBERT SMID |
分类号 |
G02B13/00;G02B3/04;G02B13/18;G11B7/135 |
主分类号 |
G02B13/00 |
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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