Method and device for writing control and image forming device

A writing control device, comprising:

• a scanning and writing device for scanning in a main scanning direction a body that moves in a sub-scanning direction with light beams according to image information when a main scanning synchronizing signal generated by the scanning and writing device is detected after an image forming start signal of the sub-scanning direction is detected, to write an image on the body, and repeating the scanning plural times to form plural images including a reference image, which are overlaid on a second body to form a color image thereon, wherein the scanning and writing device performs n (n>0) line scanning per one scanning,
• wherein in a case of t1<t2, in which t1 represents a time lapsing from the detection of the image forming start signal to the detection of the main scanning synchronizing signal when the scanning and writing device starts writing the reference image;
• and t2 represents a time lapsing from the detection of the image forming start signal to the detection of the main scanning synchronizing signal when the scanning and writing device starts writing an image other than the reference image, the scanning and writing device starts writing the image other than the reference image from a (i+1)-th line where i represents an integer so as to minimize |t1+T×(i/n)−t2| where T represents a time interval at which the main scanning synchronizing signal is generated.

A writing control device, comprising:

• a scanning and writing device for scanning in a main scanning direction a body that moves in a sub-scanning direction with light beams according to image information when a main scanning synchronizing signal generated by the scanning and writing device is detected after an image forming start signal of the sub-scanning direction is detected, to write an image on the body, and repeating the scanning plural times to form plural images including a reference image, which are overlaid on a second body to form a color image thereon,
• wherein a time lapsing from the detection of the image forming start signal to the first detection of the main scanning synchronizing signal is t1 when the scanning and writing device writes the reference image, and a time lapsing from the detection of the image forming start signal to the first detection of the main scanning synchronizing signal is t2 when the scanning and writing device writes an image other than reference image,
• wherein the scanning and writing device starts writing the reference image at a time when the time t1 has lapsed from the detection of the image forming start signal for the reference image, and
• wherein the scanning and writing device starts writing an image other than the reference image from a first line at a time when the time t2 has lapsed from the detection of the image forming start signal for the image when t1 is less than a first predetermined time and |t1−t2| is less than a second predetermined time;
• when t1 is less than the first predetermined time and |t1−t2| is not less than the second predetermined time, the scanning and writing device starts writing the image other than the reference image from a second line at the time when t2 has lapsed from the detection of the image forming start signal for the image;
• when t1 is not less than the first predetermined time and |t1−t2| is less than the second predetermined time, the scanning and writing device starts writing the image other than the reference image from the first line at the time when t2 has lapsed from the detection of the image forming start signal for the image;
• and when t1 is not less than the first predetermined time and |t1−t2| is not less than the second predetermined time, the scanning and writing device starts writing the image other than the reference image from the first line at a time when t2+T has lapsed from the detection of the image forming start signal for the image, where T represents a time interval at which the main scanning synchronizing signal is generated.

A writing control device, comprising:

• a scanning and writing device for scanning in a main scanning direction a body that moves in a sub-scanning direction with light beams according to image information when a main scanning synchronizing signal generated by the scanning and writing device is detected after an image forming start signal of the sub-scanning direction is detected, to write an image on the body, and repeating the scanning plural times to form plural images including a reference image, which are overlaid on a second body to form a color image thereon,
• wherein a time lapsing from the detection of the image forming start signal to the first detection of the main scanning synchronizing signal is t1 when the scanning and writing device writes the reference image, and a time lapsing from the detection of the image forming start signal to the first detection of the main scanning synchronizing signal is t2 when the scanning and writing device writes an image other theft reference image,
• wherein the scanning and writing device starts writing the reference image from a first line at a time when the time t1 has lapsed from the detection of the image forming start signal for the reference image when the time t1 is less than a first predetermined time, and the scanning and writing device starts writing the reference image from a second line at the time when the time t1 has lapsed from the detection of the image forming start signal for the reference image when t1 is not less than a first predetermined time, and
• wherein the scanning and writing device starts writing an image other than the reference image from a first line at a time when the time t2 has lapsed from the detection of the image forming start signal for the image when the time t1 is less than a first predetermined time and |t1−t2| is less than a second predetermined time;
• when the time t1 is less than the first predetermined time and |t1−t2| is not less than the second predetermined time, the scanning and writing device starts writing the image other than the reference image from a second line at the time when the time t2 has lapsed from the detection of the image forming start signal for the image;
• and
• when t1 is not less than the first predetermined time and |t1−t2| is less than the second predetermined time, the scanning and writing device starts writing the image other than the reference image from the second line at the time when the time t2 has lapsed from the detection of the image forming start signal for the ‘image;
• and when t1 is not less than the first predetermined time and |t1−t2| is not less than the second predetermined time, the scanning and writing device starts writing the image other than the reference image from the first line at a time when the time t2 has lapsed from the detection of the image forming start signal for the image.