发明名称 |
Densitometer for measuring toner area coverage in a xerographic printer. |
摘要 |
<p>An apparatus measures the reflectivity of a selected region of a surface. A first light beam (122) is reflected from the selected region and substantially focused on a photodetector (106). A second light beam (124) is reflected from the selected region and is substantially unfocused on the photodetector (106). A signal is derived representative of the direct reflectance of light reflected from the surface onto the photodetector (106) as a function of the intensities of the focused light beam (122) and the unfocused light beam (124) detected by the photodetector (106). <IMAGE></p> |
申请公布号 |
EP0571118(A1) |
申请公布日期 |
1993.11.24 |
申请号 |
EP19930303594 |
申请日期 |
1993.05.10 |
申请人 |
XEROX CORPORATION |
发明人 |
GENOVESE, FRANK C. |
分类号 |
G01N21/47;G01N21/25;G01N21/55;G03G15/00;G03G15/08;(IPC1-7):G01N21/55 |
主分类号 |
G01N21/47 |
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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