Registers – Coded record sensors – Particular sensor structure
Reexamination Certificate
2005-01-25
2005-01-25
Lee, Diane I. (Department: 2876)
Registers
Coded record sensors
Particular sensor structure
Reexamination Certificate
active
06845911
ABSTRACT:
A scanner unit is provided, which can make the amounts of light directed to a read line from the opposite sides of the optic axis plane substantially the same, thereby preventing a shade due to an edge of an attachment portion on a document form occurring.In the scanner unit of the present invention, the carriage mirror23and the second carriage12of the optical reading device read a document by scanning read lines LL on the document in the scanning direction (R, F) and using light reflected from the document along an optic axis plane PP which contains the read line and extends in perpendicular relation to a document glass table. An exposure lamp21and a reflector22forming an illumination device illuminate the read line from both sides of the optic axis plane with the light passing along light path L10, L11and the light passing along light path L20, L21, respectively. An light amount adjusting member, e.g., a filter25, reduces the amount of light passing along the light path L10, L11so that the amounts of illumination light directed from both sides of the optic axis plane are made substantially the same at the read line, thereby preventing a shade when reading an edge of an attachment portion on the document.
REFERENCES:
patent: 4954862 (1990-09-01), Lee et al.
patent: 6700683 (2004-03-01), Hashizume
patent: 06177004 (1994-06-01), None
patent: 8-79492 (1996-03-01), None
patent: 2001036699 (2001-02-01), None
Kabushiki Kaisha Toshiba
Lee Diane I.
Toshiba Tec Kabushiki Kaisha
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