Sharp Kabushiki Kaisha Corporation

Manabu Matsuo

Takaharu Motoyama

Nobuhiro Shirai

Takasumi Wada

Kenzo Ohkubo

Ryosuke Sasaki

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&#x3b8; 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.

Optical scanning device and image forming apparatus

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.

Optical member, optical scanning device, and image forming device

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.

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.

Optical scanning device and image forming apparatus including same

An image forming apparatus including an optical scanning device that scans an object to be scanned with a beam in a main scanning direction includes a first rotation fulcrum unit and a second rotation fulcrum unit that are respectively provided in the optical scanning device on one side and on the other side in an orthogonal direction orthogonal to the main scanning direction. The first rotation fulcrum unit is provided outside a scanning area of the beam in the main scanning direction. The optical scanning device is provided rotatably around a virtual rotation axial line connecting the first rotation fulcrum unit and the second rotation fulcrum unit.

Image forming apparatus

Respective first semiconductor lasersandand respective second semiconductor lasersandare arranged on a drive substrate(YZ plane) such that the emission directions of light beams Lto Lof the respective first semiconductor lasersandand the respective second semiconductor lasersandare perpendicular to the YZ plane. On the YZ plane, the respective first semiconductor lasersandand the respective second semiconductor lasersandare divided to two mutually different lines yand yin the lateral direction perpendicular to the rotation axis of a polygonal mirror, and the respective first semiconductor lasersandand the respective second semiconductor lasersandare arranged on respective different lines zto zin the vertical direction as the rotation axis direction of the polygonal mirror

Light scanning device having reduced size and parts count, and image forming apparatus with the same

A light scanning includes an adjusting unit that displaces the optical member to adjust the optical axis of the laser beam. The adjusting unit includes a shaft portion, a shaft supporting portion, a turning portion, a driving portion, and a turning damping unit. The shaft portion is configured to bidirectionally move in a first direction and in a second direction while turning. The first direction is a direction where the shaft portion approaches the optical member. The second direction is a direction where the shaft portion moves away from the optical member. The shaft supporting portion supports the shaft portion, and moves the shaft portion in accordance with turning of the shaft portion. The turning portion turns the shaft portion. The driving portion turns the turning portion. The turning damping unit damps a turning force applied to the shaft portion by an external force.

Light scanning device and image forming apparatus

An optical scanning device cover, covering an upper portion of an optical scanning device, includes an exposure window, a close stopper, an open stopper, and a rotation cam plate. A projection to be held in a link portion of a rotation cam is fixedly provided on a shutter. When the rotation cam is rotated in a direction of an arrow R() from a state in which the shutter is closed, A-side of the shutter turns until the shutter comes into contact with the open stopper to open that side of shutter, and thereafter, the B-side of the shutter turns to open that side of the shutter.

Growing community of inventors

Sakai, Japan

Manabu Matsuo