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| Electronic graphic arts proportional calculator |
| It is, therefore, an object of the present invention to provide an electronic hand-held calculator ... |
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| Mark array sense reader with sequential output signals |
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| Solid-state optical position determining apparatus |
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| Touch input device having digital ambient light sampling |
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| Self-contained audible alarm assembly |
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Apparatus for detecting sheet-formed support material
| Details |
Inventors: Murata, Tomoji; Ito, Masazumi;
Assignee: Minolta Camera Kabushiki Kaisha (Osaka, JP)
Primary Examiner: Nelms; David C.
Assistant Examiner:
Attorney, Agent or Firm: Wenderoth, Lind & Ponack
In an electrophotographic copying apparatus of a powder image transfer type, apparatus for detecting a transparent copy sheet passing along a predetermined transporting path including a light source provided with a first polarizing filter, and a photoresponsive element provided with a second polarizing filter; the relative spacing relationship between a plane of polarization of the first polarizing filter and a plane of polarization of the second polarizing filter is so arranged that the amount of a light received by the photoresponsive element is increased when the transparent copy sheet is passed across a light path originating from the light source. |
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DETAILED DESCRIPTION Accordingly, an essential object of the present invention is to provide apparatus for detecting sheet-formed support material, which can specifically detect the passage of a transparent sheet-formed support material or article.
Another important object of the present invention is to provide apparatus for detecting sheet-formed support material of the above-described type, which can detect the passage of the transparent sheet-formed support material without causing any physical contact of the apparatus mentioned above with the above-mentioned support material to be detected.
A further object of the present invention is to provide apparatus for detecting sheet-formed support material of the above-described type, which is especially incorporated in an electrophotographic copying apparatus.
A still further object of the present invention is to provide apparatus for detecting sheet-formed support material of the above-described type, which is simple in structure and thereby, readily incorporated in any kinds of copying apparatuses.
A further object of the present invention is to provide apparatus for detecting sheet-formed support material of the above-described type, which is highly efficient in use and, can be manufactured at low cost.
In accomplishing these and other objects according to one preferred embodiment of the present invention, there is provided an apparatus for detecting copy sheet which is especially utilized for detecting the passage, of a copy sheet along a predetermined transporting path within an electrophographic copying apparatus of a powder image transfer type, irrespective of the transparency of the copy sheet.
The apparatus mentioned above comprises a light source provided with a first polarizing filter, a first photoresponsive element provided with a second polarizing filter, both of which are parallelly positioned adjacent the path of the support material passing therethrough, a second photoresponsive element positioned adjacent the path mentioned above and spaced in a position capable of receiving a light reflected by the copy sheet passing in the path mentioned above, and a logic circuit means in use for detection of the presence of the copy sheet and the transparency of the copy sheet, with the first and second photoresponsive elements being both included
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