发明名称 |
Spatial frequency converting device and optical system having the same |
摘要 |
A spatial frequency converting device in which the amount of conversion of spatial frequency characteristics is variable. An optical system using the spatial frequency converting device is a variable-focus optical system in which the depth of field can be enlarged by fixed signal processing. A pupil modulation element provided in a fixed-focus optical system includes a plurality of elements. At least one of the elements is rotated about an optical axis. In the variable-focus optical system, a movable lens placed on the object side of a pupil modulation element is moved along an optical axis.
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申请公布号 |
US6295155(B1) |
申请公布日期 |
2001.09.25 |
申请号 |
US19990401990 |
申请日期 |
1999.09.23 |
申请人 |
OLYMPUS OPTICAL CO., LTD. |
发明人 |
SUGA TAKESHI |
分类号 |
G02B27/46;(IPC1-7):G02B26/00 |
主分类号 |
G02B27/46 |
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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