发明名称 |
Light shielding blade for camera made of para-orientation aromatic polyamide film |
摘要 |
A light-shielding blade for use in cameras utilizes a film of para-type aromatic polyamide for its base material. The light-shielding blade has a single-layer structure using an aramid film as its blade material. The film is added with carbon black at a ratio of 2 to 10 percent by weight relative to a total weight of the blade material. Alternatively, the light-shielding blade has a laminated structure with a plurality of aramid films stacked each other and having a thickness of 2 to 30 microns each, a total thickness being set to a range of 50 to 200 microns.
|
申请公布号 |
US6001465(A) |
申请公布日期 |
1999.12.14 |
申请号 |
US19980070762 |
申请日期 |
1998.05.01 |
申请人 |
COPAL COMPANY LIMITED |
发明人 |
TAKAHASHI, SHIGEMI;INOUE, NOBUYOSHI;OGAWA, TAKAO;TACHIHARA, NORIBUMI |
分类号 |
G03B9/00;B32B27/34;B32B33/00;G02F1/1335;G03B9/36;(IPC1-7):B32B9/00 |
主分类号 |
G03B9/00 |
代理机构 |
|
代理人 |
|
主权项 |
|
地址 |
|