JP2009196170A5

JP2009196170A5 -

Info

Publication number: JP2009196170A5
Application number: JP2008038919A
Authority: JP
Filing date: 2008-02-20
Publication date: 2011-05-06

Claims

In an optical scanning device that forms a latent image on the image carrier by irradiating the image carrier with a laser emitted by a laser emitting unit,
Measuring means for measuring the illuminance of the laser at a plurality of laser irradiation positions on the image carrier by the laser emitting means;
An nth-order approximation formula (n ≧ 2) is obtained by nth-order approximation of the measured values of the illuminance at the plurality of laser irradiation positions measured by the measuring unit with respect to a plurality of light amount setting values in the laser emitted from the laser emitting unit. First calculating means;
Using the n-th order approximate expression calculated by the first calculation means, the illuminance at an arbitrary laser irradiation position on the image carrier measured by the measurement means, and at least one or more of the image carrier A second calculating means for calculating an illuminance difference with the illuminance at another laser irradiation position for the plurality of light amount setting values;
Therefore the illuminance difference calculated by the second calculating means, third calculating means for calculating the illuminance correction value,
Therefore, the illuminance correction value calculated by said third calculating means, and control means for controlling the amount of laser for emitting by said laser light emitting means,
An optical scanning device comprising:

The optical scanning apparatus according to claim 1, wherein the n-th order approximate expression is a quaternary approximate expression.

In an optical scanning device that forms a latent image on the image carrier by irradiating the image carrier with a laser emitted by a laser emitting unit,
Measuring means for measuring the illuminance of the laser at a plurality of laser irradiation positions on the image carrier by the laser emitting means;
An nth-order approximation formula (n ≧ 2) is obtained by nth-order approximation of the measured values of the illuminance at the plurality of laser irradiation positions measured by the measuring unit with respect to a plurality of light amount setting values in the laser emitted from the laser emitting unit. First calculating means for calculating an expression obtained by differentiating the n-th order approximation expression;
Using an expression obtained by differentiating the n-th order approximate expression calculated by the first calculation means, the illuminance at an arbitrary laser irradiation position on the image carrier measured by the measurement means, and at least the image carrier Second calculating means for calculating an illuminance difference with illuminance at one or more other laser irradiation positions for the plurality of light amount setting values;
Therefore the illuminance difference calculated by the second calculating means, third calculating means for calculating the illuminance correction value,
Therefore, the illuminance correction value calculated by said third calculating means, and control means for controlling the amount of laser for emitting by said laser light emitting means,
An optical scanning device comprising:

The optical scanning apparatus according to claim 3, wherein the n-th order approximate expression is a second-order approximate expression.

4. The optical scanning device according to claim 1, wherein the measuring unit is disposed at a position corresponding to a laser irradiation position of the image carrier.

An optical scanning device according to any one of claims 1 to 5 is provided, and image formation is performed by transferring a visible image obtained by developing a latent image formed on an image carrier by the optical scanning device onto a sheet. An image forming apparatus.

In a control method of an optical scanning device for forming a latent image on the image carrier by irradiating the image carrier with a laser emitted by a laser emitting unit,
A measurement step of measuring the illuminance of the laser at a plurality of laser irradiation positions on the image carrier by the laser emission means;
An nth-order approximation formula (n ≧ 2) is calculated by nth-order approximation of measured values of illuminance at a plurality of laser irradiation positions measured in the measurement step with respect to a plurality of light amount setting values in a laser emitted from the laser emitting unit. A first calculation step;
Using the n-th order approximate expression calculated in the first calculation step, the illuminance at an arbitrary laser irradiation position on the image carrier measured in the measurement step, and at least one or more on the image carrier A second calculation step of calculating an illuminance difference from the illuminance at another laser irradiation position for the plurality of light amount setting values;
Therefore the illuminance difference calculated by the second calculation step, and a third calculation step of calculating the illuminance correction value,
Wherein the third intensity correction value calculated by the calculating step of Accordingly, the control method characterized by and a control step of controlling the amount of laser for emitting by said laser light emitting means.

In a control method of an optical scanning device for forming a latent image on the image carrier by irradiating the image carrier with a laser emitted by a laser emitting unit,
A measurement step of measuring the illuminance of the laser at a plurality of laser irradiation positions on the image carrier by the laser emission means;
An nth-order approximation formula (n ≧ 2) is obtained by nth-order approximation of measured values of illuminance at a plurality of laser irradiation positions measured in the measurement step with respect to a plurality of light amount setting values in a laser emitted from the laser emitting unit. A first calculation step of calculating an expression obtained by differentiating the nth-order approximate expression;
Using an expression obtained by differentiating the n-th order approximate expression calculated in the first calculation step, the illuminance at an arbitrary laser irradiation position on the image carrier measured in the measurement step, and at least the image carrier A second calculation step of calculating an illuminance difference with illuminance at one or more other laser irradiation positions for the plurality of light amount setting values;
Therefore the illuminance difference calculated by the second calculation step, and a third calculation step of calculating the illuminance correction value,
Wherein the third intensity correction value calculated by the calculating step of Accordingly, the control method characterized by and a control step of controlling the amount of laser for emitting by said laser light emitting means.

A computer-readable program for causing a computer to execute the optical scanning device control method according to claim 7 or 8.