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US 10,761,467 B1Granted
Image forming apparatus and image position adjustment method
AssigneeToshiba Tec Kabushiki Kaisha
InventorNorio Kurosawa
Life of this patent
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Abstract
According to one embodiment, an image forming apparatus includes an image forming unit, a sensor, and a control unit. The image forming unit forms a pattern constituted by a plurality of straight lines intersecting each other on a sheet or a transfer belt. The sensor detects the pattern formed on the sheet or the transfer belt. The control unit adjusts a writing position in a main scanning direction on the basis of the pattern detected by the sensor.
Claims15
An image forming apparatus comprising:
- an image forming unit including an image carrier and configured to form a pattern on the image carrier, the pattern comprising a plurality of straight lines intersecting each other;
- a sensor configured to detect the pattern formed on the image carrier;
- and
- a control unit configured to determine a writing position adjustment based upon the pattern detected by the sensor and to adjust a writing position in a main scanning direction based on the writing position adjustment;
- wherein the sensor is further configured to detect an intersection point between the plurality of straight lines in response to detecting that a formation position of the pattern does not deviate;
- and
- wherein the control unit is configured to determine that the formation position does not deviate when the intersection point is detected as a detection result of the pattern.
4 more elements
An image forming apparatus comprising:
- an image forming unit including an image carrier and configured to form a pattern on the image carrier, the pattern comprising a plurality of straight lines intersecting each other;
- a sensor configured to detect the pattern formed on the image carrier;
- and
- a control unit configured to determine a writing position adjustment based upon the pattern detected by the sensor and to adjust a writing position in a main scanning direction based on the writing position adjustment;
- wherein the image forming unit is configured such that the pattern includes two straight lines having different thicknesses and intersecting each other on the image carrier.
2 more elements
An image forming apparatus comprising:
- an image forming unit including an image carrier and configured to form a pattern on the image carrier, the pattern comprising a plurality of straight lines intersecting each other;
- a sensor configured to detect the pattern formed on the image carrier;
- and
- a control unit configured to determine a writing position adjustment based upon the pattern detected by the sensor and to adjust a writing position in a main scanning direction based on the writing position adjustment;
- wherein the control unit is further configured to increment a number of times of detection in response to detecting the pattern, compare the number of times of detection to a threshold, perform error processing in response to determining that the number of times of detection is equal to or greater than the threshold, and perform error processing in response to not detecting the pattern.
2 more elements
An image position adjustment method comprising:
- forming a pattern on an image carrier, the pattern comprising a plurality of straight lines intersecting each other;
- detecting the pattern;
- adjusting a writing position of an image forming unit in a main scanning direction on the basis of the pattern;
- determining a formation position of the pattern in response to detecting the pattern;
- storing the formation position;
- determining a deviation by comparing the formation position to a previous formation position;
- determining a deviation direction based on the deviation;
- comparing the deviation direction to a previous deviation direction;
- determining a threshold based upon the comparison between the deviation direction and the previous deviation direction;
- comparing the deviation to the threshold;
- and
- causing the pattern to deviate by the deviation amount in response to determining that the deviation is smaller than the threshold.
9 more elements
An image position adjustment method comprising:
- forming a pattern on an image carrier, the pattern comprising a plurality of straight lines intersecting each other;
- detecting the pattern;
- adjusting a writing position of an image forming unit in a main scanning direction on the basis of the pattern;
- determining a formation position of the pattern in response to detecting the pattern;
- storing the formation position;
- determining a deviation by comparing the formation position to a previous formation position;
- determining a deviation direction based on the deviation;
- incrementing a number of times of detection in response to detecting the pattern;
- comparing the number of times of detection to a threshold;
- and
- performing error processing in response to determining that the number of times of detection is equal to or greater than the threshold.
8 more elements
Dependencies are inferred from the claim text.