A light scanning apparatus including: a first holder attached to a housing and configured to hold a first laser light source; a second holder attached to the housing and configured to hold a second laser light source; and a lens to which the laser lights are first incident, wherein the first holder and the second holder are attached to the housing in mutually different positions in a rotation axis direction of a rotary polygon mirror and in an optical axis direction of the lens, so that a first incident light path from the first laser light source to the rotary polygon mirror is placed between a second incident light path from the second laser light source to the rotary polygon mirror and the lens, and the first holder and the second holder overlap one another in the rotation axis direction.

A light scanning apparatus including: a first holder attached to a housing and configured to hold a first laser light source; a second holder attached to the housing and configured to hold a second laser light source; and a lens to which the laser lights are first incident, wherein the first holder and the second holder are attached to the housing in mutually different positions in a rotation axis direction of a rotary polygon mirror and in an optical axis direction of the lens, so that a first incident light path from the first laser light source to the rotary polygon mirror is placed between a second incident light path from the second laser light source to the rotary polygon mirror and the lens, and the first holder and the second holder overlap one another in the rotation axis direction.

An apparatus which forms an electrostatic latent image by exposing a charged photosensitive member with light. The apparatus identifies a pixel which has density value less than a threshold value and is sandwiched in a predetermined direction between two pixels having density values greater than or equal to the threshold value in image data, generates screen image data by screen processing on the image data, and outputs, for each of one pixel of the two pixels sandwiching the identified pixel and a pixel adjacent to the one pixel in the predetermined direction, an adjusted density value the screen image data.

An apparatus which forms an electrostatic latent image by exposing a charged photosensitive member with light. The apparatus identifies a pixel which has density value less than a threshold value and is sandwiched in a predetermined direction between two pixels having density values greater than or equal to the threshold value in image data, generates screen image data by screen processing on the image data, and outputs, for each of one pixel of the two pixels sandwiching the identified pixel and a pixel adjacent to the one pixel in the predetermined direction, an adjusted density value the screen image data.

A moving device, which is included in an image forming apparatus, includes a cam, a moving body, a biasing body, a drive source and a drive transmission device. The moving body is configured to be moved by the cam. The biasing body is configured to apply a biasing force to bias the moving body toward the cam. The drive source is configured to apply a driving force to the cam. The drive transmission device is configured to transmit the driving force to the cam and includes a load applying body configured to apply a load to a rotation of the cam.

A moving device, which is included in an image forming apparatus, includes a cam, a moving body, a biasing body, a drive source and a drive transmission device. The moving body is configured to be moved by the cam. The biasing body is configured to apply a biasing force to bias the moving body toward the cam. The drive source is configured to apply a driving force to the cam. The drive transmission device is configured to transmit the driving force to the cam and includes a load applying body configured to apply a load to a rotation of the cam.

A laser scanning unit includes a rotary polygon mirror, a shaft support portion, a plurality of light application portions, and a plurality of scanning lenses. The plurality of light application portions are configured to cause light beams to be incident at a plurality of incidence positions different in an axial direction parallel to the rotary shaft on the rotary polygon mirror. In the laser scanning unit, the following relationship is satisfied: when, of the plurality of light beams, a specific light beam incident at the incidence position that is most distant from the shaft support portion on the rotary polygon mirror passes through an optical axis of the corresponding scanning lens, an angle between the specific light beam incident on the rotary polygon mirror and the optical axis of the scanning lens is closest to a reference angle defined in advance as a usage condition of the scanning lens.

A laser scanning unit includes a rotary polygon mirror, a shaft support portion, a plurality of light application portions, and a plurality of scanning lenses. The plurality of light application portions are configured to cause light beams to be incident at a plurality of incidence positions different in an axial direction parallel to the rotary shaft on the rotary polygon mirror. In the laser scanning unit, the following relationship is satisfied: when, of the plurality of light beams, a specific light beam incident at the incidence position that is most distant from the shaft support portion on the rotary polygon mirror passes through an optical axis of the corresponding scanning lens, an angle between the specific light beam incident on the rotary polygon mirror and the optical axis of the scanning lens is closest to a reference angle defined in advance as a usage condition of the scanning lens.

In order to prevent interference between a primary transfer bias voltage and a secondary transfer bias voltage, and to prevent occurrence of an image defect due to interference between these bias voltages, an image forming apparatus includes a plurality of primary transfer rollers, an intermediate transfer belt, a drive roller, a secondary transfer roller, and a rectifier roller. A primary transfer bias voltage of a polarity opposite to the polarity of toner is applied to a primary transfer bias applying unit. A secondary transfer bias voltage of a same polarity as the polarity of toner is applied to the drive roller. The rectifier roller is disposed between a most-downstream primary transfer roller and the drive roller. A bias voltage of the same polarity as the polarity of the primary transfer bias voltage or the polarity of the secondary transfer bias voltage is applied to the rectifier roller.

In order to prevent interference between a primary transfer bias voltage and a secondary transfer bias voltage, and to prevent occurrence of an image defect due to interference between these bias voltages, an image forming apparatus includes a plurality of primary transfer rollers, an intermediate transfer belt, a drive roller, a secondary transfer roller, and a rectifier roller. A primary transfer bias voltage of a polarity opposite to the polarity of toner is applied to a primary transfer bias applying unit. A secondary transfer bias voltage of a same polarity as the polarity of toner is applied to the drive roller. The rectifier roller is disposed between a most-downstream primary transfer roller and the drive roller. A bias voltage of the same polarity as the polarity of the primary transfer bias voltage or the polarity of the secondary transfer bias voltage is applied to the rectifier roller.