Image reading device and image reading method
AssigneeToshiba Tec Kabushiki Kaisha
InventorSatoshi Onuma
Life of this patent
Estimating the term…
Abstract
An image reading device includes a tray, a paper feed roller that conveys a sheet, a first sensor that detects a front end and a rear end of the sheet, a second sensor that detects the front end of the sheet, and a scanner that reads an image on a front side of the sheet and reads an image on a back side of the sheet. A controller determines a first time duration that elapses from the detection of the front end of the sheet by the first sensor to the detection of the rear end of the sheet by the first sensor and operates the scanner to read the image on the back side of the sheet over a second time duration equal in length to the first time duration. The second time duration begins after the front end of the sheet is detected by the second sensor.
Claims20
An image reading device comprising:
- a tray configured to support a sheet;
- a paper feed roller positioned to convey the sheet away from the tray;
- a first sensor positioned to detect a front end and a rear end of the sheet as the sheet is conveyed;
- a second sensor positioned to detect the front end of the sheet as the sheet is conveyed;
- a scanner configured to read an image on a front side of the sheet at a front-side reading position and configured to read an image on a back side of the sheet at a back-side reading position;
- and
- a controller configured to:
- determine a first time duration that elapses from the detection of the front end of the sheet by the first sensor to the detection of the rear end of the sheet by the first sensor;
- and
- commence mask processing on the image on the back side of the sheet after the front end of the sheet is detected by the second sensor.
An image reading method comprising:
- supporting, by a tray, a sheet;
- conveying, by a paper feed roller, the sheet away from the tray;
- detecting, by a first sensor, a front end and a rear end of the sheet as the sheet is conveyed;
- detecting, by a second sensor, the front end of the sheet;
- determining a first time duration that elapses from the detection of the front end of the sheet by the first sensor to the detection of the rear end of the sheet by the first sensor;
- reading, by a scanner, an image on the front side of the sheet at a front-side reading position;
- and
- performing, by a controller, mask processing on the image on the back side of the sheet at a second point in time, a second time duration beginning at a first point in time after the front end of the sheet is detected by the second sensor and ending at the second point in time, and the second time duration being equal in length to the first time duration.
An image reading device comprising:
- a tray configured to support a sheet;
- a paper feed roller positioned to convey the sheet away from the tray;
- a sensor positioned to detect a front end and a rear end of the sheet as the sheet is conveyed;
- a scanner configured to read an image on a front side of the sheet at a front-side reading position and configured to read an image on a back side of the sheet at a back-side reading position;
- and
- a controller configured to:
- start a sheet length measurement timer when the front end of the sheet is detected by the sensor;
- stop the sheet length measurement timer when the rear end of the sheet is detected by the sensor;
- determine a length of the sheet based on a value of the sheet length measurement timer;
- and
- commence mask processing on the image on the back side of the sheet based on the determined length of the sheet.
Dependencies are inferred from the claim text.