An image forming apparatus includes an image forming unit having a photosensitive member, an exposure unit, and a developing unit having a developing sleeve; and a controller configured to acquire read data relating to a first test image, a second test image, and a third test image formed on a same sheet by the image forming unit, and adjust a density in a main scanning direction of an image to be formed by the image forming unit based on the read data. A first interval between the first test image and the second test image is different from a second interval between the second test image and the third test image. Each of the first interval and the second interval is different from an integral multiple of a circumferential length of the photosensitive member, and is different from an integral multiple of a circumferential length of the developing sleeve.

An electrophotographic imaging device, including at least one photoconductive member, a printhead unit, at least one shutter-wiper member, and at least one shutter actuator. The at least one shutter-wiper member is moveable in a first direction between a first position in which the shutter-wiper covers the at least one exit lens of the printhead unit and a second position in which the at least one shutter-wiper does not cover the at least one exit lens so as to allow the at least one light beam generated by the printhead unit to pass therethrough. The at least one actuator is coupled to the at least one shutter-wiper member such that movement of the at least one shutter actuator in a second direction substantially orthogonal to the first direction causes the corresponding shutter-wiper member to move in the first direction.

An optical scanning apparatus includes a first polarizing member and a second polarizing member between a light source and a MEMS mirror that is a deflection mirror. The first polarizing member reflects a first polarization component included in a beam light emitted from the light source so as to squarely enter the MEMS mirror and passes a second polarization component having a phase difference of a half-wavelength with respect to the first polarization component. The second polarizing member is provided between the first polarizing member and the MEMS mirror to pass the first polarization component reflected by the first polarizing member therethrough twice before and after being reflected by the MEMS mirror to change the first polarization component into the second polarization component. A rotation axis of the MEMS mirror is parallel to an optical axis of the beam light immediately before being reflected by the first polarizing member.

A mounting assembly for mounting a mirror to a frame in a laser scanning unit of an electrophotographic image forming device includes a bracket attached between the frame and the mirror. The bracket includes a body having a first surface and a second surface transverse to the first surface. A first set of protrusions extends from the first surface for defining a first gap between the frame and the bracket that limits adhesive thickness therebetween when the first surface of the bracket is adhesively attached to the frame. A second set of protrusions extends form the second surface for defining a second gap between the mirror and the bracket that limits adhesive thickness therebetween when the second surface of the bracket is adhesively attached to the mirror.

An image forming apparatus includes: an image forming unit having a photosensitive member, an exposure unit, and a developing unit having a developing sleeve; and a controller configured to acquire read data relating to a first test image, a second test image, and a third test image formed on a same sheet by the image forming unit, and adjust a density in a main scanning direction of an image to be formed by the image forming unit based on the read data. A first interval between the first test image and the second test image is different from a second interval between the second test image and the third test image. Each of the first interval and the second interval is different from an integral multiple of a circumferential length of the photosensitive member, and is different from an integral multiple of a circumferential length of the developing sleeve.

A mounting assembly for mounting a mirror to a frame in a laser scanning unit of an electrophotographic image forming device includes a bracket attached between the frame and the mirror. The bracket includes a body having a first surface and a second surface transverse to the first surface. A first set of protrusions extends from the first surface for defining a first gap between the frame and the bracket that limits adhesive thickness therebetween when the first surface of the bracket is adhesively attached to the frame. A second set of protrusions extends form the second surface for defining a second gap between the mirror and the bracket that limits adhesive thickness therebetween when the second surface of the bracket is adhesively attached to the mirror.

This invention provide a PWM outputting circuit that, from pattern data represented by a plurality of bits representing a pulse width, generates a pulse width modulation signal, wherein the circuit comprises a multi-phase-clock generating circuit which generates a multi-phase clock which is a plurality of clocks of mutually different phases; an edge-pulse generating circuit which, from the pattern data that is inputted, detects a bit position of a rising-edge and a bit position of a falling-edge in the pulse width modulation signal, and generates a rising-edge-pulse and a falling-edge-pulse based on the detection; and an SR latch circuit which, by the rising-edge-pulse being inputted to a set terminal and the falling-edge-pulse being inputted to a reset terminal, generates and outputs the pulse width modulation signal.

This invention provide a PWM outputting circuit that, from pattern data represented by a plurality of bits representing a pulse width, generates a pulse width modulation signal, wherein the circuit comprises a multi-phase-clock generating circuit which generates a multi-phase clock which is a plurality of clocks of mutually different phases; an edge-pulse generating circuit which, from the pattern data that is inputted, detects a bit position of a rising-edge and a bit position of a falling-edge in the pulse width modulation signal, and generates a rising-edge-pulse and a falling-edge-pulse based on the detection; and an SR latch circuit which, by the rising-edge-pulse being inputted to a set terminal and the falling-edge-pulse being inputted to a reset terminal, generates and outputs the pulse width modulation signal.

A mounting assembly for mounting a mirror to a frame in a laser scanning unit of an electrophotographic image forming device includes a bracket attached between the frame and the mirror. The bracket includes a body having a first surface and a second surface transverse to the first surface. A first set of protrusions extends from the first surface for defining a first gap between the frame and the bracket that limits adhesive thickness therebetween when the first surface of the bracket is adhesively attached to the frame. A second set of protrusions extends form the second surface for defining a second gap between the mirror and the bracket that limits adhesive thickness therebetween when the second surface of the bracket is adhesively attached to the mirror.

A mounting assembly for mounting a mirror to a frame in a laser scanning unit of an electrophotographic image forming device includes a bracket attached between the frame and the mirror. The bracket includes a body having a first surface and a second surface transverse to the first surface. A first set of protrusions extends from the first surface for defining a first gap between the frame and the bracket that limits adhesive thickness therebetween when the first surface of the bracket is adhesively attached to the frame. A second set of protrusions extends form the second surface for defining a second gap between the mirror and the bracket that limits adhesive thickness therebetween when the second surface of the bracket is adhesively attached to the mirror.