| 发明名称 |
Step tablet |
| 摘要 |
A step tablet in which density steps of a definite shape, each density step having a specific optical density, form a series of decreasing or increasing densities, in which any two density steps contiguous to each other are disposed with a boundary space of a specific shape between the density steps.
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| 申请公布号 |
US4183990(A) |
申请公布日期 |
1980.01.15 |
| 申请号 |
US19770853794 |
申请日期 |
1977.11.21 |
| 申请人 |
FUJI PHOTO FILM CO LTD |
发明人 |
HASEGAWA, EIICHI;IKEDA, TEPPEI;NOGUCHI, HIROSHI;UCHIDA, TOSHIO;YABUTA, YORIMITI |
| 分类号 |
G03B27/80;G03C5/02;G03C5/08;G03F7/20;(IPC1-7):B32B7/02;G03C5/04 |
主分类号 |
G03B27/80 |
| 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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