Title:
OPTICAL APERTURE DEVICE
Document Type and Number:
WIPO Patent Application WO/1997/017625
Kind Code:
A1
Abstract:
An optical aperture device having a pinhole for providing a point light source, wherein the pinhole is formed in a plurality of layers spaced with gaps. This simple structure provides a unifocal point light source having a small spot diameter.
Inventors:
MATSUNO KIYONORI (JP)
WAKAI HIDEYUKI (JP)
WAKAI HIDEYUKI (JP)
Application Number:
PCT/JP1996/003306
Publication Date:
May 15, 1997
Filing Date:
November 11, 1996
Export Citation:
Assignee:
KOMATSU MFG CO LTD (JP)
MATSUNO KIYONORI (JP)
WAKAI HIDEYUKI (JP)
MATSUNO KIYONORI (JP)
WAKAI HIDEYUKI (JP)
International Classes:
G02B5/00; (IPC1-7): G02B5/00; G02B21/00
Foreign References:
| JPH0743614A | 1995-02-14 |
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