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US 2012/0069126 A1Published application
Image forming apparatus and method of the same
AssigneesToshiba Tec Kabushiki Kaisha, Kabushiki Kaisha Toshiba
InventorHiroyuki Fuse
Life of this patent
Estimating the term…
Abstract
According to one embodiment, a laser controller generates a signal which corresponds to an output signal of a laser beam detection sensor before detecting an abnormality, in which the abnormality is detected, in a pseudo manner, on the basis of an output signal of a laser beam detection sensor in which the abnormality is not detected. In addition, the laser controller controls a laser unit which corresponds to the laser beam detection sensor in which the abnormality is detected, according to the generated signal.
Claims18
An image forming apparatus comprising:
- a plurality of image carriers;
- a laser exposure unit which includes a plurality of laser units which emits a laser beam, and forms a latent image on each of the image carriers, by performing main scanning and sub-scanning on each of the image carriers using the laser beam which is emitted from these laser units;
- and
- a processing unit which transfers the latent image which is formed on each of the image carriers, to a medium to be formed with images,
- wherein the laser exposure unit includes,
- a plurality of laser beam detection sensors which detects the laser beam which is emitted from each of the laser units, as the reference position of the main scanning with respect to each of the image carriers;
- a detection section which detects an abnormality of each of the laser beam detection sensors;
- a generation section which generates a signal which corresponds to an output signal of the laser beam detection sensors before detecting an abnormality, in which the abnormality is detected in the detection section, on the basis of the output signal of the laser beam detection sensors in which the abnormality is not detected in the detection section;
- and
- a laser controller which controls, the laser unit which corresponds to the laser beam detection sensor in which the abnormality is not detected in the detection section, according to the output signal of the laser beam detection section in which the abnormality is not detected;
- and the laser unit which corresponds to the laser beam detection sensor in which the abnormality is detected in the detection section, on the basis of the output signal of the generation section.
8 more elements
An image forming apparatus comprising:
- a plurality of photoconductive drums;
- a laser exposure unit which includes a plurality of laser units which emits a laser beam, and forms a latent image on each of the photoconductive drums, by performing main scanning and sub-scanning on each of the photoconductive drums using the laser beam which is emitted from these laser units;
- and
- a processing unit which transfers the latent image which is formed on each of the photoconductive drums, to a medium to be formed with images,
- wherein the laser exposure unit includes,
- a first and second laser beam detection sensors which detects the laser beam which is emitted from each of the laser units, as the reference position of the main scanning with respect to each of the photoconductive drums;
- a first detection section which detects an abnormality of the first laser beam detection sensor;
- a second detection section which detects an abnormality of the second laser beam detection sensor;
- a first generation section which generates a signal which corresponds to the output signal of the first laser beam detection sensor before detecting an abnormality, when the abnormality is detected in the first detection section, in pseudo manner, on the basis of the output signal of the second laser beam detection sensor;
- a second generation section which generates a signal which corresponds to the output signal of the second laser beam detection sensor before detecting an abnormality, when the abnormality is detected in the second detection section, in pseudo manner, on the basis of the output signal of the first laser beam detection sensor;
- and
- a laser controller which controls, the laser unit which corresponds to the first laser beam detection sensor, according to the output signal of the same first laser beam detection sensor, when the abnormality of the first laser beam detection sensor is not detected in the first detection section;
- controls the laser unit which corresponds to the second laser beam detection sensor, according to the output signal of the same second laser beam detection sensor, when the abnormality of the second laser beam detection sensor is not detected in the second detection section;
- controls the laser unit which corresponds to the first laser beam detection sensor, according to the output signal of the first generation section, when the abnormality of the first laser beam detection sensor is detected in the first detection section and when the abnormality of the second laser beam detection sensor is not detected in the second detection section;
- and controls the laser unit which corresponds to the second laser beam detection sensor, according to the output signal of the second generation section, when the abnormality of the second laser beam detection sensor is detected in the second detection section and the abnormality of the first laser beam detection sensor is not detected in the first detection section.
12 more elements
A controlling method of an image forming apparatus including;
- a plurality of image carriers;
- a laser exposure unit which includes a plurality of laser units which emits a laser beam, and forms a latent image on each of the photoconductive drums, by performing main scanning and sub-scanning on each of the photoconductive drums using the laser beam which is emitted from these laser units, and a plurality of laser beam detection sensors which detects a laser beam which is emitted from each of the laser units, as the reference position of the main scanning with respect to each of the image carriers;
- and
- a processing unit which transfers the latent image which is formed on each of the photoconductive drums, to a medium to be formed with images,
- the method comprising:
- detecting an abnormality of each of the laser beam detection sensors;
- generating a signal which corresponds to the output signal of the laser beam detection sensor before detecting an abnormality, in which the abnormality is detected, when the abnormality is detected in any one of each of the laser beam detection sensor, in a pseudo manner, on the basis of the output signal of the laser beam detection sensor in which the abnormality is not detected;
- and
- controlling the laser unit which corresponds to the laser beam detection sensor in which the abnormality is detected, according to the generated signal, and the laser unit which corresponds to the laser beam detection sensor in which the abnormality is not detected, according to the output signal of the laser beam detection sensor in which the abnormality is not detected.
6 more elements
Dependencies are inferred from the claim text.