Document reader and image and image forming apparatus capable of reducing line-shaped noise
AssigneeKonica Minolta Business Technologies, Inc.
InventorHiroshi Nishikawa
Life of this patent
Estimating the term…
Abstract
A document reading unit constituting an MFP reciprocates a reading glass holder in a direction of a vertical scanning at a low frequency (18 times per second) with use of a crank mechanism including a motor and gears. A stroke length of the reciprocating motion of a reading glass is 9 mm. This structure can make a line-shaped noise less noticeable, because a length of each portion of a line-shaped noise becomes 2.57 mm and a distance between adjacent portions of the line-shaped noise becomes 7.27 mm when a foreign object having a diameter of 100 μm adheres to the reading glass.
Claims10
A document reader that reads a color image of a document via a transparent member while feeding the document, comprising:
- a plurality of reading units disposed in a feeding direction of the document;
- and
- a driving unit operable to reciprocate the transparent member in the feeding direction over the reading units, wherein
- a stroke length of the reciprocating motion of the transparent member is longer than a width in the feeding direction of a reading area of the reading units.
An image forming apparatus, comprising
- a document reader including:
- a feeding unit operable to feed a document;
- a transparent member;
- a plurality of reading units disposed in a feeding direction of the document and operable to read a color image of the document via the transparent member;
- and
- a driving unit operable to reciprocate the transparent member in the feeding direction over the reading units, wherein
- a stroke length of the reciprocating motion of the transparent member is longer than a width in the feeding direction of a reading area of the reading units.
A document reading method performed by a document reader including a transparent member and a plurality of reading units that read a color image of a document via the transparent member, the reading units being disposed in a feeding direction of the document, the document reading method comprising:
- a feeding step of feeding the document;
- and
- a driving step of driving reciprocating the transparent member in the feeding direction over the reading units, wherein
- a stroke length of the reciprocating motion of the transparent member is longer than a width in the feeding direction of a reading area of the reading units.
Dependencies are inferred from the claim text.