Image forming apparatus and detecting device for detecting a type of recording sheet
AssigneeCanon Kabushiki Kaisha
InventorShoji Maruyama
Life of this patent
Estimating the term…
Abstract
An image forming apparatus that detects a type of recording sheet and sets an image forming condition in accordance with the detected type of sheet includes a feeding unit that feeds a sheet, an image forming unit that forms an image on a sheet, and a reading unit that reads a picture of a surface of a sheet. A discriminating unit discriminates whether re-reading is necessary, on the basis of the picture. If so, another unit changes a reading condition of the reading unit and causes the reading unit to re-read the picture of the surface of the sheet. A detecting unit detects a type of sheet on the basis of the picture read by the reading unit, and a controlling unit controls an image forming condition on the basis of the result of the detection.
Claims28
A detecting device comprising:
- a reading unit adapted to read a picture of a shadow of an edge of a fed sheet;
- and
- a detecting unit adapted to detect a thickness of the sheet on the basis of the picture read by said reading unit.
A detecting device comprising:
- a reading unit adapted to read a picture of a surface of a feeding sheet;
- a discriminating unit adapted to discriminate whether a rereading is necessary on the basis of the picture read by said reading unit;
- a unit adapted to change a reading condition of said reading unit and to cause said reading unit to reread a picture of a surface of the sheet, on the basis of a fact that it has been discriminated by said discriminating unit that the rereading is necessary;
- and
- a detecting unit adapted to detect a type of the sheet on the basis of the picture read by said reading unit.
An image forming apparatus comprising:
- a feeding unit adapted to feed a sheet;
- an image forming unit adapted to form an image on the sheet fed by said feeding unit;
- a reading unit adapted to read a picture of a shadow of an edge of the sheet fed by said feeding unit;
- a detecting unit adapted to detect a thickness of the sheet on the basis of the picture read by said reading unit;
- and
- a controlling unit adapted to control an image forming condition of said image forming unit on the basis of a result of detection.
An image forming apparatus comprising:
- a feeding unit adapted to feed a sheet;
- an image forming unit adapted to form an image on the sheet fed by said feeding unit;
- a reading unit adapted to read a picture of a surface of the sheet fed by said feeding unit;
- a discriminating unit adapted to discriminate whether a rereading is necessary on the basis of the picture read by said reading unit;
- a unit adapted to change a reading condition of said reading unit and to cause said reading unit to reread a picture of a surface of the sheet, on the basis of a fact that it has been discriminated by said discriminating unit that the rereading is necessary;
- a detecting unit adapted to detect a type of the sheet on the basis of the picture read by said reading unit;
- and
- a controlling unit adapted to control an image forming condition of said image forming unit on the basis of a result of detection by said detecting unit.
Dependencies are inferred from the claim text.