Abstract: 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.

Abstract: An optical scanning device comprises an optical box that houses an optical component(s). The optical box includes a box main body and a cover member. A first engaging portion is formed on a side wall of the box main body, and a second engaging portion that engages with the first engaging portion is formed on a first fitting wall portion of the cover member. The box main body is provided with a vertical wall that is erected inside the first engaging portion. Moreover, there is formed on the cover member with a first barrier wall that is protruded downward from a top wall so as to enter a space between the first engaging portion and the vertical wall.

Abstract: An optical scanning device includes a light source and a beam detector for taking a main scanning start time of a light beam emitted from the light source and deflection-scanned by a deflection-scanning component to a predetermined main scanning direction. On the light source and the beam detector, the emission side of the light source and the light receiving side of the beam detector face the light-incident side of an f? lens, which is longer in the main scanning direction. The light source is arranged on the upstream side in the main scanning direction and the beam detector is arranged on the downstream side in the main scanning direction, or the beam detector is arranged on the upstream side in the main scanning direction and the light source is arranged on the downstream side in the main scanning direction.

Abstract: An optical scanning unit steers a light beam emitted from a laser diode in the main scanning direction by a polygon mirror. The laser diode, a collimator lens, an aperture, a first lens, the polygon mirror, and a condensing lens are sequentially placed in the optical system of the optical scanning unit. The laser diode emits a light beam in which divergent angles in intersecting two directions are different from each other. The direction in which the light beam divergent angle is large is aligned with the sub-scanning direction, and the direction in which the light beam divergent angle is small is aligned with the main scanning direction. The first lens has a first function to condense a beam in the sub-scanning direction and a second function to diffuse a beam in the main scanning direction.

Abstract: An optical member that refracts a light beam to diverge or focus the light beam, includes: at least three pairs of opposing surfaces. Each of the three pairs of opposing surfaces include a lens. Curvatures of the lenses at one side surfaces of the respective three pairs of surfaces are all the same, or curvatures of the lenses at one side surfaces of respective pairs of at least two pairs of the three pairs of surfaces are different from each other, and respective shortest distances between optical axes of the lenses at the one side surfaces of respective pairs of the at least two pairs of surfaces, and reference sides which are each any one of respective sides surrounding surfaces including the lenses are different from each other.

Abstract: An optical scanning device includes a light source, a beam detector that takes a main scanning start time of a light beam emitted from the light source and deflection-scanned in a predetermined main scanning direction by a deflection-scanning component, and a housing with a support portion that supports reflecting mirrors in different arrangement positions so arrangement angles are different from each other. The support portion includes a first support portion that supports a first side surface of the reflecting mirror in a plurality of arrangement positions. A second support portion supports the first side surface of the mirror with the first support portion, causing a first arrangement angle in the first arrangement position of the reflecting mirror. A third support portion supports the first side surface of the reflecting mirror with the first support portion, causing a second arrangement angle in a second arrangement position of the reflecting mirror.

Abstract: An optical scanning device according to the present invention has a 2-beam type first laser diode and a 1-beam type second laser diode. When resolution in a sub-scanning direction is 600 dpi, exposure processing is executed by a first laser beam and a second laser beam emitted from the first laser diode. And when the resolution in the sub-scanning direction is 1200 dpi, the exposure processing is executed by the first laser beam and a third laser beam emitted from the second laser diode.

Abstract: An optical scanning device comprises an optical box that houses an optical component(s). The optical box includes a box main body and a cover member. A first engaging portion is formed on a side wall of the box main body, and a second engaging portion that engages with the first engaging portion is formed on a first fitting wall portion of the cover member. The box main body is provided with a vertical wall that is erected inside the first engaging portion. Moreover, there is formed on the cover member with a first barrier wall that is protruded downward from a top wall so as to enter a space between the first engaging portion and the vertical wall.

Abstract: An optical scanning device includes a light source that emits a light beam, a lens member, and a housing that supports the lens member. The housing and the lens member are provided with a housing-side engagement and a lens member-side engagement respectively that engage with each other. The housing-side engagement and the lens member-side engagement are capable of pivoting the lens member around an axis along an optical axis direction of the light beam passing through a contact contacted through concavo-convex engagement with each other.

Abstract: To provide an optical scanning device including a lower housing including an opened top part, an upper housing that covers the top part of the lower housing, a rotating polygon mirror that reflects a beam, an f? lens on which the beam reflected by the rotating polygon mirror is incident, and a reflection mirror that reflects the beam. The lower housing is provided with a bottom surface opening including an opened bottom surface between the rotating polygon mirror and the reflection mirror.

Abstract: An optical scanning device according to the present invention has a 2-beam type first laser diode and a 1-beam type second laser diode. When resolution in a sub-scanning direction is 600 dpi, exposure processing is executed by a first laser beam and a second laser beam emitted from the first laser diode. And when the resolution in the sub-scanning direction is 1200 dpi, the exposure processing is executed by the first laser beam and a third laser beam emitted from the second laser diode.

Abstract: 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.

Abstract: An optical member that refracts a light beam to diverge or focus the light beam, includes: at least three pairs of opposing surfaces. Each of the three pairs of opposing surfaces include a lens. Curvatures of the lenses at one side surfaces of the respective three pairs of surfaces are all the same, or curvatures of the lenses at one side surfaces of respective pairs of at least two pairs of the three pairs of surfaces are different from each other, and respective shortest distances between optical axes of the lenses at the one side surfaces of respective pairs of the at least two pairs of surfaces, and reference sides which are each any one of respective sides surrounding surfaces including the lenses are different from each other.

Abstract: An optical scanning device includes a light source, a beam detector that takes a main scanning start time of a light beam emitted from the light source and deflection-scanned in a predetermined main scanning direction by a deflection-scanning component, and a housing with a support portion that supports reflecting mirrors in different arrangement positions so arrangement angles are different from each other. The support portion includes a first support portion that supports a first side surface of the reflecting mirror in a plurality of arrangement positions. A second support portion supports the first side surface of the mirror with the first support portion, causing a first arrangement angle in the first arrangement position of the reflecting mirror. A third support portion supports the first side surface of the reflecting mirror with the first support portion, causing a second arrangement angle in a second arrangement position of the reflecting mirror.

Abstract: An optical scanning device includes a light source that emits a light beam, a lens member, and a housing that supports the lens member. The housing and the lens member are provided with a housing-side engagement and a lens member-side engagement respectively that engage with each other. The housing-side engagement and the lens member-side engagement are capable of pivoting the lens member around an axis along an optical axis direction of the light beam passing through a contact contacted through concavo-convex engagement with each other.

Abstract: An optical scanning device includes a light source and a beam detector for taking a main scanning start time of a light beam emitted from the light source and deflection-scanned by a deflection-scanning component to a predetermined main scanning direction. On the light source and the beam detector, the emission side of the light source and the light receiving side of the beam detector face the light-incident side of an f? lens, which is longer in the main scanning direction. The light source is arranged on the upstream side in the main scanning direction and the beam detector is arranged on the downstream side in the main scanning direction, or the beam detector is arranged on the upstream side in the main scanning direction and the light source is arranged on the downstream side in the main scanning direction.

Abstract: To provide an optical scanning device including a lower housing including an opened upper part, an upper housing that covers the upper part of the lower housing, and an f? lens on which a beam reflected by a rotating polygon mirror is incident. The lower housing includes a raised area being raised upward from a lower housing bottom surface. The f? lens is mounted to face a bottom side of the raised area.

Abstract: An optical scanning device includes: a polygon mirror deflecting light beams; and a plurality of reflective mirrors reflecting the light beams so as to guide the light beams to respective photosensitive drums. A first f? lens is provided on an optical path of the light beam from the polygon mirror to a first reflective mirror. The optical path of the light beam reflected by a third reflective mirror crosses the optical path between the first reflective mirror and a second reflective mirror.

Abstract: An optical scanning device includes: a polygon mirror deflecting light beams; and a plurality of reflective mirrors reflecting the light beams so as to guide the light beams to respective photosensitive drums. A first f? lens is provided on an optical path of the light beam from the polygon mirror to a first reflective mirror. The optical path of the light beam reflected by a third reflective mirror crosses the optical path between the first reflective mirror and a second reflective mirror.

Abstract: To provide an optical scanning device including a lower housing including an opened upper part, an upper housing that covers the upper part of the lower housing, and an f? lens on which a beam reflected by a rotating polygon mirror is incident. The lower housing includes a raised area being raised upward from a lower housing bottom surface. The f? lens is mounted to face a bottom side of the raised area.