Information processing apparatus and image forming apparatus

An information processing apparatus, which is connected to an image forming apparatus including an image forming unit,

• the image forming unit comprising:
• a first receiver configured to receive image data;
• a light source configured to output light based on the image data received by the first receiver;
• a photosensitive member;
• a rotary polygon mirror having a plurality of reflection faces, wherein the rotary polygon mirror is configured to rotate to deflect the light output from the light source through use of the plurality of reflection faces, to thereby scan the photosensitive member;
• a light receiver configured to receive the light deflected by the rotary polygon mirror;
• an identifier configured to identify a reflection face that is used for scanning of the photosensitive member from among the plurality of reflection faces based on a result of the reception of the light by the light receiver;
• and
• a generator configured to generate a first signal including a signal having a first level and a signal having a second level, wherein the generator is configured to generate the first signal based on information related to the reflection face identified by the identifier such that a length of a first period differs from a length of a second period, the first period being a period in which the first signal corresponding to a specific reflection face from among the plurality of reflection faces is at the first level, and the second period being a period in which the first signal corresponding to a reflection face other than the specific reflection face is at the first level,
• the information processing apparatus comprising:
• a second receiver configured to receive the first signal;
• a first detector configured to detect a first change, in which a level of the first signal received by the second receiver is changed from the second level to the first level;
• a second detector configured to detect a second change, in which the level of the first signal received by the second receiver is changed from the first level to the second level;
• a first output unit configured to output a second signal in response to detection of the first change;
• a determiner configured to determine, based on a first timing, at which the first change is detected, and a second timing, at which the second change is detected first since a stop of output of the first timing, whether the first change at the first timing is a change corresponding to the specific reflection face, wherein a time period in which output of the second signal is continued is shorter than the length of the first period and the length of the second period;
• a corrector configured to correct, based on a determination result obtained by the determiner, image data corresponding to a scanning line of the light, through use of correction data corresponding to the reflection face corresponding to the scanning line;
• and
• a second output unit configured to output the image data corrected by the corrector to the image forming unit in response to the first detector detecting the first change.

An image forming apparatus including a first generator which generates image data and an image forming unit which forms an image on a recording medium based on the image data output from the first generator,

• the image forming unit comprising:
• a first receiver configured to receive image data;
• a light source configured to output light based on the image data received by the first receiver;
• a photosensitive member;
• a rotary polygon mirror having a plurality of reflection faces, wherein the rotary polygon mirror is configured to rotate to deflect the light output from the light source through use of the plurality of reflection faces, to thereby scan the photosensitive member;
• a light receiver configured to receive the light deflected by the rotary polygon mirror;
• an identifier configured to identify a reflection face that is used for scanning of the photosensitive member from among the plurality of reflection faces based on a result of the reception of the light by the light receiver;
• and
• a second generator configured to generate a first signal including a signal having a first level and a signal having a second level, wherein the second generator is configured to generate the first signal based on information related to the reflection face identified by the identifier such that a length of a first period differs from a length of a second period, the first period being a period in which the first signal corresponding to a specific reflection face from among the plurality of reflection faces is at the first level, and the second period being a period in which the first signal corresponding to a reflection face other than the specific reflection face is at the first level,
• the first generator comprising:
• a second receiver configured to receive the first signal;
• a first detector configured to detect a first change, in which a level of the first signal received by the second receiver is changed from the second level to the first level;
• a second detector configured to detect a second change, in which the level of the first signal received by the second receiver is changed from the first level to the second level;
• a determiner configured to determine, based on a first timing, at which the first change is detected, and a second timing, at which the second change is detected first after a predetermined time period has passed since the first timing, whether the first change at the first timing is a change corresponding to the specific reflection face, wherein the predetermined time period is shorter than the length of the first period and the length of the second period;
• a corrector configured to correct, based on a determination result obtained by the determiner, image data corresponding to a scanning line of the light, through use of correction data corresponding to the reflection face corresponding to the scanning line;
• and
• a first output unit configured to output the image data corrected by the corrector to the image forming unit in response to the first detector detecting the first change.

An image forming apparatus including a first generator which generates image data and an image forming unit which forms an image on a recording medium based on the image data output from the first generator,

• the image forming unit comprising:
• a first receiver configured to receive image data;
• a light source configured to output light based on the image data received by the first receiver;
• a photosensitive member;
• a rotary polygon mirror having a plurality of reflection faces, wherein the rotary polygon mirror is configured to rotate to deflect the light output from the light source through use of the plurality of reflection faces, to thereby scan the photosensitive member;
• a light receiver configured to receive the light deflected by the rotary polygon mirror;
• an identifier configured to identify a reflection face that is used for scanning of the photosensitive member from among the plurality of reflection faces based on a result of the reception of the light by the light receiver;
• and
• a second generator configured to generate a first signal including a signal having a first level and a signal having a second level, wherein the second generator is configured to generate the first signal based on information related to the reflection face identified by the identifier such that a length of a first period differs from a length of a second period, the first period being a period in which the first signal corresponding to a specific reflection face from among the plurality of reflection faces is at the first level, and the second period being a period in which the first signal corresponding to a reflection face other than the specific reflection face is at the first level,
• the first generator comprising:
• a second receiver configured to receive the first signal;
• a first detector configured to detect a first change, in which a level of the first signal received by the second receiver is changed from the second level to the first level;
• a second detector configured to detect a second change, in which the level of the first signal received by the second receiver is changed from the first level to the second level;
• a first output unit configured to output a second signal in response to detection of the first change;
• a determiner configured to determine, based on a first timing, at which the first change is detected, and a second timing, at which the second change is detected first since a stop of output of the first timing, whether the first change at the first timing is a change corresponding to the specific reflection face, wherein a time period in which output of the second signal is continued is shorter than the length of the first period and the length of the second period;
• a corrector configured to correct, based on a determination result obtained by the determiner, image data corresponding to a scanning line of the light, through use of correction data corresponding to the reflection face corresponding to the scanning line;
• and
• a second output unit configured to output the image data corrected by the corrector to the image forming unit in response to the first detector detecting the first change.