Abstract: An image forming apparatus capable of preventing the increase of the size thereof by having a lengthened developer bearing member is provided with regard to an image forming apparatus capable of printing a registration mark (dragonfly) on a large sheet of recording paper for producing an art work in case of the use of a formed image as a printing manuscript. The length of the lengthwise direction of a developer bearing member provided in at least one developing device among the developing devices provided in the image forming apparatus is longer than those of the developer bearing members of the other developing devices.

Abstract: In a device for controlling the amount of toner replenished to a developing device depending on the density of a reference image formed on a photoconductor, if the toner density of a developer in the developing device fluctuates extremely; there may occur toner scattering, formation of coarse or rough images, and carrier attachment. To overcome those problems, a photosensor is disposed to detect the toner density in the developing device, and when an output of the photosensor is outside of a predetermined range, a target value to be compared with the detected density of the reference image is modified.

Abstract: A coupling lens couples a light flux from a light source to form a parallel light flux, a convergent light flux, or a divergent light flux. An optical deflector includes a deflective reflection surface, which deflects the light flux from the coupling lens at a uniform angular velocity. A scanning image-formation optical system converges the deflected light flux received from the optical deflector on a surface to be scanned to form a beam spot. The device scans the surface to be scanned with the beam spot at a uniform velocity. A depth increasing component, increases the depth of focus determined by the entire optical system of the device, on the optical path between the light source and the deflective reflection surface.

Abstract: A developing apparatus having a developing container for containing developer including toner and carrier, and developing an electrostatic image formed on an image bearing member, a carrying member for carrying the developer in the developing container, and a discharge port provided in the developing container for discharging any excess developer resulting from the supply of the developer, wherein the developer carrying capability of the carrying member is greater in an area near the discharge port than in an area downstream of the discharge port in the carrying direction of the developer.

Abstract: An imaging device array of the present invention effectively reduces the influence of ghost light and flare light. An optical writing unit using the imaging device array and an image forming apparatus using the optical writing unit are also disclosed.

Abstract: An optical print head of the present invention includes a light emitting element array having of a plurality of light emitting elements. A rod lens array has a plurality of rod lenses for focusing light output from the rod lenses on an image carrier in the form of beam spots. The rod lenses each have a conjugate length greater than a distance between the light emitting element array, which forms a x1 image, and the image carrier. The head of the present invention reduces the diameter of a beam spot and positions a beam waist close to the image carrier to thereby increase resolution. An image forming apparatus using the above head is also disclosed.

Abstract: A coupling lens couples a light flux from a light source to form a parallel light flux, a convergent light flux or a divergent light flux. An optical deflector includes a deflective reflection surface which deflects the light flux from the coupling lens at a uniform angular velocity. A scanning image-formation optical system converges the deflected light flux received from the optical deflector on a surface to be scanned to form a beam spot. The device scans the surface to be scanned with the beam spot at a uniform velocity. A depth increasing component, increases the depth of focus determined by the entire optical system of the device, on the optical path between the light source and the deflective reflection surface.

Abstract: An image forming apparatus includes a light emitting array composed of a plurality of light emitting elements that emits light fluxes. An imaging element array may be provided so as to perform imaging with the light fluxes on a prescribed plane. A three dimensional exposure intensity distribution of the light flux is obtained per each light emitting element. A prescribed attribute is obtained from each of the exposure intensity distributions. A plurality of comparison values for the entire exposure valid region may be obtained from different units which consist of two or more successive attributes. Prescribed light emitting quantities enabling all of the comparison values to fall within a prescribed range may be determined and set to respective light emitting elements.

Abstract: An optical writing unit is capable of producing a high-quality image in which the formation of white stripes and black stripes, due to uneven intervals between light emitting devices, is suppressed. The unevenness, often occurring at the junction part of two-light emitting diode array chips, is compensated for by increasing or decreasing the light volume of light emitting devices that are located on and near the edge of a light emitting device array chip, such that a property value concerning an exposure intensity distribution falls within a predetermined range for an effective image domain in its entirety.

Abstract: The present invention provides a thin film deposition apparatus for producing an optical film with an optical characteristic on a deposition substrate in a vacuum chamber by depositing a film producing material on the deposition substrate, comprising:

Abstract: An image forming apparatus includes an image bearing member; a first developer container for containing toner and carrier particles and for developing an electrostatic latent image formed on the image bearing member at a developing station; a rotatable member for rotating the first developer container along a path extending through the developing station, wherein the first developer container is effective to discharge residual matter produced by receiving the toner and carrier particles to outside of the first developer container using a rotation of the rotatable member; a first stretch that the second developer container for containing toner particles and for developing an electrostatic latent image formed on the image bearing member, wherein the second developer container is disposed at a position different from that of the developing station.

Abstract: A video data transmission system in which a video signal transmitting apparatus and a plurality of video signal receiving apparatuses are coupled to each other via a network, and the video signal transmitting apparatus has a first memory unit for storing a video signal as digital video data which is sequentially updated a plurality of second memory units to which the digital video data is written at predetermined timings and from which the digital video data is read and a control unit for controlling the first and second memory units and a transmitter for transmitting the digital video data to the network. With the configuration, optimum digital video data is transmitted to the plurality of video signal receiving apparatuses in accordance with the transmission band of the network coupled to the video signal transmitting apparatus.

Abstract: An imaging device array of the present invention effectively reduces the influence of ghost light and flare light. An optical writing unit using the imaging device array and an image forming apparatus using the optical writing unit are also disclosed.

Abstract: An image forming elements array includes a plurality of image forming elements which are integrated with each other and are arranged to extend in an arrangement direction so as to generate an image having common magnification. When the distance along the optical axis from an object plane to the incident surface of the image forming element is represented by L and the distance along the optical axis from the incident surface to the emerging surface is represented by T, a condition 0.20≦T/L≦0.50 is satisfied.

Abstract: The present invention relates to an optical writing device and an image forming apparatus and method in which the optical writing device is provided. In the optical writing device of the invention, a light source array has an array of light sources emitting a plurality of light beams. A focusing lens array has a row of focusing lens elements focusing the light beams from the light source array onto a surface of a photosensitive medium, the focusing lens elements being arrayed in an array direction, each focusing lens element having a visual field radius X in the array direction and a diameter D in the array direction. The focusing lens array is configured to satisfy the condition: m>2.0 where m is an overlap ratio of each of the focusing lens elements defined by the equation m=X/D.

Abstract: An optical printing head includes a light-emitting component array having a plurality of light-emitting components arranged therein, and an imaging component array having a plurality of imaging components arranged therein each for imaging from a light flux from a respective light-emitting component of the light-emitting component array to a beam spot on an image carrying body surface. In a configuration relationship between the light-emitting component array, imaging component array and image carrying body surface, a focal length of the imaging components is slightly larger than the focal length of imaging components in a condition in which a unity-magnification relationship is satisfied.

Abstract: A developer supplying apparatus includes a developer container containing therein a developer provided with a toner and a carrier, a developer bearing member for magnetically bearing and carrying the developer in the developer container to develop an electrostatic latent image formed on an image bearing member, a detector for detecting information corresponding to the density of the toner, and a supplying device for supplying the toner and the carrier to the developer container in conformity with the output of the detector. The intensity of an electric field for shifting the carrier from the developer bearing member to the image bearing member is greater than the intensity of an electric field formed between a nonimage portion of the electrostatic latent image formed on the image bearing member and the developer bearing member.

Abstract: A developer density controlling apparatus includes image density detecting device for detecting a target density on the basis of a detected image and, if a difference between a toner density detected by a developer density detecting device and the target density is equal to or greater than a predetermined value, the image density detecting device does not correct the target density.

Abstract: A coupling lens couples a light flux from a light source to form a parallel light flux, a convergent light flux or a divergent light flux. An optical deflector includes a deflective reflection surface which deflects the light flux from the coupling lens at a uniform angular velocity. A scanning image-formation optical system converges the deflected light flux received from the optical deflector on a surface to be scanned to form a beam spot. The device scans the surface to be scanned with the beam spot at a uniform velocity. A depth increasing component, increases the depth of focus determined by the entire optical system of the device, on the optical path between the light source and the deflective reflection surface.

Abstract: When the structure is arranged such that one of the repulsion poles is used as a developer layer thickness regulation pole, screw pitch-shaped density unevenness occurred at the rear end of a solid black image.