| 发明名称 |
Soft-focus optical element |
| 摘要 |
A soft-focus optical element has a light-transmitting surface formed with a plurality of low refractive index portions each in the form of a lens-like curved surface; the size of each low refractive-index portion is within the following range; 0.05 mm</= phi </=0.5 mm (1) and 0.5 mu </=h</=3 mu (2) where the diameter of the aperture of the low refractive-index portion is represented by phi and the height or depth between the light-transmitting surface and the top of the lens-shaped curved portion of the low refractive-index portion is presented by h; and the ratio S of the area of the plurality of low refractive-index portions to the area of the light-transmitting surface is defined as follows: 5%</=S</=35% (3) The soft-focus optical element may be attached on an image-focusing lens.
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| 申请公布号 |
US4871242(A) |
申请公布日期 |
1989.10.03 |
| 申请号 |
US19880161057 |
申请日期 |
1988.02.26 |
| 申请人 |
NIKON CORPORATION |
发明人 |
SOUSA, TOSHIO;WAKAMIYA, KOICHI;WAKABAYASHI, HIROSHI;KANAI, HACHIRO;MIYAMOTO, HIDENORI |
| 分类号 |
G02B3/00;G02B13/20;G02B27/46;G03B11/00 |
主分类号 |
G02B3/00 |
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