摘要:
A developing method including forming a layer of electrically charged toner particles on a surface of the developer carrying member and dispersing magnetic particles retaining on their surfaces electrically charged toner particles on the surface of the developer carrying member, carrying the particles on the developer carrying member to a developing position where a surface of an electrostatic latent image bearing member for bearing an electrostatic latent image is opposed with a clearance to the surface of the developer carrying member, applying an alternating electric field across the clearance and forming the magnetic particles into chains of the magnetic particles by magnetic field generating means disposed behind the developer carrying member, and developing the electrostatic latent image by the charged toner particles on the surface of the developer carrying member and on the surfaces of the magnetic particles.
摘要:
A developing apparatus for developing an electrostatic latent image on an electrostatic latent image bearing member includes a container for containing a developer which contains toner particles and magnetic particles, a developer carrying member, opposed to the electrostatic latent image bearing member, for forming a developing position for supplying the toner particles to the latent image bearing member and for carrying the developer from the container to the developing position, magnetic field generating magnet disposed across the developer carrying member from the latent image bearing member for generating a magentic field, developer regulating member for regulating the developer which contains the toner particles and carrier particles and which is carried to the developing position, wherein the magnetic field generating magnet includes one magnetic pole adjacent an upstream side of the regulating member with respect to a movement direction of the developer carrying member, and wherein a magnetic flux density downstream of the one pole less steeply decreases the increase thereof at an upstream side.
摘要:
The present invention relates to a developing apparatus using magnetic carrier particles and toner particles under the influence of an alternating current. One embodiment of the present invention includes a developer which is a mixture of toner particles and resin coated magnetic particles. An alternating electric field is formed between a latent image bearing member and developer carrying member to form a toner image corresponding to an electrostatic latent image. An electric resistivity curve of the magnetic particles on a coordinate graph, where the abscissa represents an electric field E (V/cm) applied to the magnetic particles and the ordinate represents an electric resistivity R (ohm-cm) of the magnetic particles, crosses a zone defined by lines, AB, BD, DC and CA, whereA is a point with coordinates (0.2.times.10.sup.3, 10.sup.11);B is a point with coordinates (2.times.10.sup.3, 3.times.10.sup.9);C is a point with coordinates (0.2.times.103, 10.sup.8); andD is a point with coordinates (2.times.10.sup.3, 2.times.10.sup.7).The resistivity R is measured by a sandwich type cell having electrodes with a clearance of 0.4 cm and an electrode area of 4 cm.sup.2, in which 1 kg wt. is applied to one of the electrodes, and a voltage is applied across the electrodes.
摘要:
A developing apparatus for developing a latent image on a latent image bearing member, including a magnetic device for forming a magnetic brush of a developer mixture containing developer particles and magnetic particles; a movable developer carrying member for developing the latent image on the latent image bearing member, the developer carrying member being contactable with the magnetic brush to receive the developer mixture; a magnetic particle blocking member, disposed opposed to the developer carrying member at a position downstream of the position where the developer carrying member is contacted with the magnetic brush, for blocking the magnetic particles to form a coating of the developer particles on a surface of the developer carrying member, wherein the coating of the developer particles is conveyed by the movement of the developer carrying member to a developing station where the latent image is developed with the conveyed developer particles.
摘要:
A developing apparatus includes a container for containing a non-magnetic developer and magnetic particles, a developer carrier for carrying the non-magnetic developer toward an image bearing member, a regulating member located adjacent to the non-magnetic developer discharge opening of the container to form a gap between the surface of the carrier and the regulating member, and a magnet positioned adjacent to the carrier at the side of the carrier opposite to the regulating member and causing the magnetic particles to form a magnetic brush upstream of the regulating member adjacent to the developer discharge opening of the container with respect to the direction in which the developer carrier is moved, whereby a thin layer of the non-magnetic developer can be formed on the developer carrier.
摘要:
A developing apparatus for developing a latent image includes a container, a developer carrying member movable along an endless path from inside the container to the outside, a magnetic field generator inside the carrying member, a partition member in the container for separately supporting, before operation, a first developer of magnetic particles and a second developer of non-magnetic particles, and a regulating member cooperable with the magnetic field generator. Upon release of the partition member, the first developer forms a base layer on the carrying member and the second developer forms on the base layer and then, upon circulation of the carrying member the second developer is moved past the regulating member.
摘要:
A developing apparatus includes a container for containing a non-magnetic developer and magnetic particles, a developer carrier for carrying the non-magnetic developer toward an image bearing member, a regulating member located adjacent to the non-magnetic developer discharge opening of the container to form a gap between the surface of the carrier and the regulating member, and a magnet positioned adjacent to the carrier at the side of the carrier opposite to the regulating member and causing the magnetic particles to form a magnetic brush upstream of the regulating member adjacent to the developer discharge opening of the container with respect to the direction in which the developer carrier is moved, whereby a thin layer of the non-magnetic developer can be formed on the developer carrier.
摘要:
A thin developer layer forming device includes a developer supply container, having an opening, for containing a non-magnetic developer and magnetic particles, an endlessly movable developer carrying member of a non-magnetic material for carrying a developer, which is movable between an inside of the developer supply container and an outside of the developer supply container through the opening, rotatable member for generating a magnetic field, disposed in the carrying member, and a magnetic particles confining member, provided outside of the developer carrying member and cooperable with a magnetic pole of the magnetic field generating means to confine the magnetic particles within the developer container, wherein the magnetic field generating member is rotated in the developer carrier to move the magnetic particles in a direction opposite to a direction of movement of the developer carrying member.
摘要:
In a developing method, a layer of electrically charged toner particles is formed on a surface of a developer carrying member, and magnetic particles which retain on their surfaces electrically charged toner particles are dispersed on the surface of the developing carrying member. The toner particles and magnetic particles are carried on the developing carrying member to a developing position where a surface of an electrostatic latent image bearing member for bearing an electrostatic latent image is opposed with a clearance to the surface of the developer carrying member. An alternating electric field is formed at the developing position against the electrostatic image and chains of magnetic particles are formed by stationary magnetic field generating apparatus disposed behind the developer carrying member. The latent electrostatic latent image is developed by the charge toner particles on the surface of the developer carrying member and on the surface of the magnetic particles in the clearance under the alternating electric field and the stationary magnetic field.
摘要:
A developing method utilizing a developer including a mixture of magnetic carrier particles and toner particles wherein a stationary layer containing magnetic particles is formed on a developer carrying member in a developer container. The stationary layer is allowed to expand and contract in order to control an area of the developer supplying opening upstream of the stationary layer with respect to movement of the developer carrying member thus stabilizing the toner content in the developer supplied to the developing station.