Brother Kogyo Kabushiki-kaisha

Minoru Matsuura

Toshio Furukawa

Yuichi Matsushita

Yosuke Sugiyama

An image forming apparatus includes an exposing device including: light sources including light emitting portions and respectively for photoconductors; a deflector for deflecting light from each light emitting portion; optical systems each for using the deflected light to form an image on the photoconductor; and a first beam detector for detecting reference light deflected by the deflector. A storage stores parameters respectively for the light emitting portions. Each of the parameters relates to a writing time extending from the detection of the reference light to emission of light for exposing a surface of the photoconductor from the light emitting portion. A controller controls the timing of emission of light from each light emitting portion for exposing the surface of the photoconductor, based on a result of the detection of the reference light and a corresponding one of the parameters.

Image forming apparatus

Optical scanner for scanning a target surface with a light beam includes: a light deflector deflecting the light beam; a scanning lens made of resin and condensing the light beam deflected by the light deflector onto the target surface to form an image thereon; a frame to which the scanning lens is fixed and having a coefficient of linear expansion smaller than that of the scanning lens. The scanning lens is fixed to the frame at a first attachment portion and at least one second attachment portion of the scanning lens using adhesives. The first attachment portion is located closer to a center portion of a scanning range in a main scanning direction of the scanning lens than the second attachment portion is. A first adhesive used for the first attachment portion has an elastic coefficient greater than that of a second adhesive used for the second attachment portion.

Optical scanner

There is provided an image forming apparatus including plural photosensitive members on which developer images are formed by supplying developer to electrostatic latent images, respectively, an exposure device which illuminates light beams onto surfaces of the photosensitive members to form the electrostatic latent images, respectively. The developer images on the respective photosensitive numbers are transferred to a transferred medium which is moved in a moving direction while contacting the respective photosensitive members. The exposure device is configured such that a beam diameter of light beam exposing a most-upstream photosensitive member in the moving direction on a surface of the most-upstream photosensitive member is larger than a beam diameter of light beam exposing a most-downstream photosensitive member in the moving direction on a surface of the most-downstream photosensitive member.

Growing community of inventors

Nagoya, Japan

Minoru Matsuura