JP2007078874A5

JP2007078874A5 -

Info

Publication number: JP2007078874A5
Application number: JP2005264402A
Authority: JP
Filing date: 2005-09-12
Publication date: 2010-06-17
Anticipated expiration: 2025-09-12

Claims

In an image forming apparatus for forming a color image by transferring a toner image formed on an image carrier with a plurality of colors of toner to a recording medium ,
An image forming unit that forms a toner image on the image carrier based on image data, and a color misregistration correction toner image for correcting a formation position of the toner image formed on the image carrier; Image forming means capable of forming on the image carrier a density adjusting toner image for adjusting the density of the toner image formed on the image carrier;
A light emitting unit for irradiating the image carrier intermediate transfer member, the color misregistration correction toner image, and the density adjustment toner image;
A regular reflection light receiving unit that receives regular reflection light of light emitted from the light emitting unit and generates light amount data based on the received light amount;
To receive a regular reflection light receiving unit for receiving regular reflection light from the intermediate transfer member and diffuse reflection light of light emitted from the light emitting unit, and to generate light amount data based on the received light amount of the diffuse reflection light Image information detecting means having a diffusely reflected light receiving portion,
Based on light amount data based on specularly reflected light from the color misregistration correction toner image and a predetermined threshold value, a formation position of the color misregistration correction toner image of each color formed on the image carrier is obtained, and Color misregistration correction means for correcting the formation position of the toner image of each color on the image carrier based on the relative positional relationship of the formation position of the color misregistration correction toner image;
Light amount data based on regular reflection light from the image carrier, light amount data based on regular reflection light from the density adjustment toner image, light amount data based on diffuse reflection light from the image carrier, and density adjustment toner image And detecting the density of the toner image for density adjustment based on the light quantity data based on the diffuse reflected light from the image, and correcting the density of the toner image formed on the image carrier by the image forming unit based on the detection result Density correction means for
The light emission intensity of the light emitting unit is adjusted so that the difference between the light amount data based on the regular reflection light from the image carrier and the light amount data based on the regular reflection light from the color misregistration correction toner image is equal to or greater than a predetermined value. Emission intensity adjusting means;
When the light emission intensity of the light emitting unit is adjusted by the adjusting unit, the light amount data based on the diffuse reflected light from the density adjustment toner image based on the light emission intensity adjustment amount is based on the light emission intensity adjustment amount. Light amount data correction means for correcting,
When the light emission intensity of the light emitting unit is adjusted by the adjustment unit, the density correction unit includes light amount data corrected by the light amount data correction unit and light amount data based on regular reflection light from the density adjustment toner image. And detecting the density of the toner image for density adjustment based on the image forming apparatus.

The adjusting means is an adjusting means for changing the light emission intensity by modulating a pulse width of a pulse signal for driving the light emitting unit,
The light quantity correction unit is configured to receive the diffuse reflection received by the diffuse reflection light receiving unit based on a table in which a correction value for correcting the light quantity of the diffuse reflected light is associated with a duty ratio of the pulse signal. The image forming apparatus according to claim 1 , wherein the amount of light is corrected .

The adjustment unit increases the light emission intensity of the light emitting unit when the amount of specular reflected light from the image carrier received by the regular reflection light receiving unit is equal to or lower than a lower limit value. the image forming apparatus according to 2.

The adjusting means is configured to determine whether or not the amount of specularly reflected light received by the specularly reflected light receiving unit when the light emitting unit irradiates a predetermined portion on the image carrier with light is equal to or less than the lower limit value. The image forming apparatus according to claim 3 , further comprising:

The adjusting means determines whether or not the regular reflection light quantity received by the regular reflection light receiving unit when the light emitting unit irradiates a plurality of arbitrary points on the image carrier is not more than the lower limit value. The image forming apparatus according to claim 3 , further comprising:

In a control method of an image forming apparatus for forming a color image by transferring a toner image formed on an image carrier with a plurality of colors of toner to a recording medium,
An image forming step of forming a toner image on the image carrier based on image data, and a color misregistration correction toner image for correcting a formation position of the toner image formed on the image carrier; An image forming step capable of forming, on the image carrier, a density adjusting toner image for adjusting the density of the toner image formed on the image carrier;
A light emitting unit for irradiating the image carrier intermediate transfer member, the color misregistration correction toner image, and the density adjustment toner image;
A regular reflection light receiving unit that receives regular reflection light of light emitted from the light emitting unit and generates light amount data based on the received light amount;
To receive a regular reflection light receiving unit for receiving regular reflection light from the intermediate transfer member and diffuse reflection light of light emitted from the light emitting unit, and to generate light amount data based on the received light amount of the diffuse reflection light An image information detecting step for receiving light by the diffusely reflected light receiving unit of
Based on light amount data based on specularly reflected light from the color misregistration correction toner image and a predetermined threshold value, the formation position of the color misregistration correction toner image of each color formed on the image carrier is obtained, and A color misregistration correction step of correcting the formation position of the toner image of each color on the image carrier based on the relative positional relationship of the formation position of the color misregistration correction toner image;
Light amount data based on regular reflection light from the image carrier, light amount data based on regular reflection light from the density adjustment toner image, light amount data based on diffuse reflection light from the image carrier, and density adjustment toner image And detecting the density of the toner image for density adjustment based on the light amount data based on the diffuse reflected light from the image, and correcting the density of the toner image formed on the image carrier by the image forming process based on the detection result Density correction process to
The light emission intensity of the light emitting unit is adjusted so that the difference between the light amount data based on the regular reflection light from the image carrier and the light amount data based on the regular reflection light from the color misregistration correction toner image is equal to or greater than a predetermined value. Emission intensity adjustment step;
When the light emission intensity of the light emitting unit is adjusted by the adjustment step, the light amount data based on the diffuse reflected light from the density adjustment toner image based on the light emission intensity adjustment amount is based on the light emission intensity adjustment amount. A light amount data correction step to correct,
When the light emission intensity of the light emitting unit is adjusted by the adjustment step, the density correction step includes light amount data corrected by the light amount data correction step and light amount data based on regular reflection light from the density adjustment toner image. And detecting a density of the toner image for density adjustment based on the control method.

The adjustment step is an adjustment step of changing the emission intensity by modulating a pulse width of a pulse signal for driving the light emitting unit,
In the light amount correction step, the diffuse reflection received by the diffuse reflection light receiving unit is based on a table in which a correction value for correcting the light amount of the diffuse reflection light is associated with a duty ratio of the pulse signal. The control method according to claim 6, wherein the amount of light is corrected.

The adjustment step increases the light emission intensity of the light emitting unit when the amount of specular reflected light from the image carrier received by the regular reflected light receiving unit is equal to or lower than a lower limit value. 8. The control method according to 7.

In the adjusting step, whether or not the amount of specularly reflected light received by the specularly reflected light receiving unit when the light emitting unit irradiates a predetermined portion on the image carrier is equal to or less than the lower limit value. The control method according to claim 8, wherein the control method is determined.

In the adjusting step, whether or not the regular reflection light amount received by the regular reflection light receiving unit when the light emitting unit irradiates light to a plurality of arbitrary points on the image carrier is equal to or less than the lower limit value. The control method according to claim 8, wherein the control method is determined.