Abstract: An image forming apparatus includes an image forming unit that forms an unfixed toner image on a recording material and a fixing unit, wherein, in a case where an image is formed by using the toners of the plurality of colors, when a specific gravity of the toners is ? (g/cm3) and a weight average particle diameter of the toners is L (?m), the image forming unit sets a maximum laid-on amount A (mg/cm2) of each color in the unfixed toner image on the recording material so as to satisfy the following condition: A<??L/30?3, and wherein the fixing unit fixes the unfixed toner image to the recording material so that a dot spread amount (?m) of the toner image satisfies the following condition: ?(??L3/90?3A)?Dot Spread Amount.

Abstract: An image heating apparatus includes a rotatable belt member for heating an image on a recording material; a rotatable member pressing against said belt member; a nip forming member, provided inside said belt member, for cooperating with said rotatable member to form a nip for nipping and feeding the recording material; a projection provided on a side of said nip forming member near the nip and projecting toward the nip; and an executing portion for executing a first image heating mode operation in which an image formed on the recording material having a first thickness with said projection projected into a nip region and a second image heating mode operation in which an image formed on the recording material having a second thickness which is smaller than the first thickness with said projection is outside the nip region.

Abstract: An image forming apparatus includes an image forming device a fixing device having a fixing nip by wherein in an image forming process of the image forming device, 0<B<??L/(30×31/2) is satisfied where L (?m) is a volume average particle size of toner of the unfixed toner image, ? (g/cm^3) is a density of the toner, B (mg/cm^2) is a maximum toner deposition amount, per unit area, on a predetermined recording paper, wherein the fixing device fixes the toner image while satisfying that, at an outlet of the fixing nip, a viscosity of a toner layer contacting the fixing device is not higher than 1500 (Pa·s), and a viscosity of a toner layer contacting the recording paper is not lower than 3000 (Pa·s).

Abstract: In an image forming apparatus including an image forming unit which forms an image in which toner containing a wax is used on a recording material, and a fixing device which heats the toner image formed on the recording material at a nip portion which nips and conveys the recording material, when the fixing device heats the recording material on which a toner image having a maximum toner-carrying amount of toner is formed, when a temperature of a surface of the toner layer reaches a temperature at which an endothermic amount indicates a peak in a relationship between a temperature of the toner and the endothermic amount, a condition of the fixing device at the nip portion is set so that a temperature of an interface between the toner and the recording material is lower than a temperature of a surface of the toner.

Abstract: When an unfixed toner image is formed on a recording material, a maximum toner amount per unit area satisfies A<(??L)/30?3, where a specific gravity of a toner is ? (g/cm3), a weight-average particle size is L (?m), and the toner amount per unit area of the unfixed toner image on the recording material is A (mg/cm2), in formation of the unfixed toner image with each color toner, and the unfixed toner image is fixed so that a region where colors of chromatic toners of respective colors in the above-described images are seen in an overlaid state is 84% or more.

Abstract: An image heating apparatus includes: an endless belt for heating a toner image on a recording material in a nip; an exciting coil for heating the belt by electromagnetic induction heating; rotatable driving member for forming the nip between itself and the belt and for rotationally driving the belt; a magnetic flux suppressing member for suppressing magnetic flux when a predetermined recording material having a width narrower than a maximum-width recording material usable in the image heating apparatus is subjected to image heating, wherein the magnetic flux, of magnetic flux directed from the exciting coil toward the belt, is directed toward a part of a region outside, with respect to a widthwise direction of the belt, of a region where the belt is contactable to the predetermined recording material; and a rotatable heat-absorbing member for absorbing heat from the rotatable driving member in contact therewith.

Abstract: An image heating apparatus is provided with a mechanism for changing pressure at a nip portion to prevent wrinkle in a rear end portion of an envelope in fixing the envelope is provided. If the width size of the envelope is equal to a predetermined width or less, the pressure at the nip portion is reduced.

Abstract: An image forming portion of an image forming apparatus is configured to form a toner image on a recording medium such that a relationship of M???L/(30?3) is satisfied, where a volume average particle size of toner is L(?m), density of the toners is ? (g/cm3), and a maximum toner laid quantity per unit area of a single color toner image on a recording medium is M (mg/cm2). The toner image formed by the image forming portion is fixed on the recording medium by a fixing nip portion by being heated and applied a force in a direction of a plane of the recording medium.

Abstract: In an image forming apparatus having a color developing device and a transparent developing device the triboelectric chargeability of the transparent toner by a developer carrying member provided in the transparent developing device is made higher than a triboelectric chargeability of a color toner by a developer carrying member provided in the color developing device.

Abstract: An image forming apparatus includes an image forming device a fixing device having a fixing nip by wherein in an image forming process of the image forming device, 0<B<??L/(30×31/2) is satisfied where L (?m) is a volume average particle size of toner of the unfixed toner image, ? (g/cm?3) is a density of the toner, B (mg/cm?2) is a maximum toner deposition amount, per unit area, on a predetermined recording paper, wherein the fixing device fixes the toner image while satisfying that, at an outlet of the fixing nip, a viscosity of a toner layer contacting the fixing device is not higher than 1500 (Pa·s), and a viscosity of a toner layer contacting the recording paper is not lower than 3000 (Pa·s).

Abstract: In order to output a print with high gloss uniformity, a transparent toner is consumed in a large amount. For that reason, when a constitution of a color developing device and a constitution of a transparent developing device are made substantially identical, a charge amount of the transparent toner is lowered with continuous image formation. In a state in which the transparent toner is not sufficiently charged, an electrostatic image formed on a photosensitive member cannot be sufficiently developed with the toner. Therefore, a triboelectric chargeability of the transparent toner by a developer carrying member provided in the transparent developing device is made higher than a triboelectric chargeability of a color toner by a developer carrying member provided in the color developing device.

Abstract: In an image forming apparatus including an image forming unit which forms an image in which toner containing a wax is used on a recording material, and a fixing device which heats the toner image formed on the recording material at a nip portion which nips and conveys the recording material, when the fixing device heats the recording material on which a toner image having a toner maximum carrying amount of toner is formed, when a temperature of a surface of the toner layer reaches a temperature at which an endothermic amount indicates a peak in a relationship between a temperature of the toner and the endothermic amount, a condition of the fixing device at the nip portion is set so that a temperature of an interface between the toner and the recording material is lower than a temperature of a surface of the toner.

Abstract: An image heating apparatus includes a rotatable belt member for heating an image on a recording material; a rotatable member pressing against said belt member; a nip forming member, provided inside said belt member, for cooperating with said rotatable member to form a nip for nipping and feeding the recording material; a projection provided on a side of said nip forming member near the nip and projecting toward the nip; and an executing portion for executing a first image heating mode operation in which an image formed on the recording material having a first thickness with said projection projected into a nip region and a second image heating mode operation in which an image formed on the recording material having a second thickness which is smaller than the first thickness with said projection is outside the nip region.

Abstract: An image forming apparatus includes a first image carrying member for carrying a first toner image; a second image carrying member for carrying a second toner image in a maximum amount, of the second toner image carried on the second image carrying member, larger than a maximum amount of the first image carried on the first image carrying member; a first transfer member for electrostatically transferring the first toner image onto a transfer medium in a first transfer nip formed by bringing the transfer medium into contact with the first, image bearing member; and a second transfer member for electrostatically transferring the second toner image onto the transfer medium in a second transfer nip formed by bringing the transfer medium into contact with the second bearing member so that a length of the second transfer nip with respect to a movement direction of the transfer member is longer than a length of the first transfer nip with respect to the movement direction.

Abstract: An image forming apparatus includes a photosensitive member; an exposure device for exposing to light the photosensitive member to form an electrostatic latent image by using exposure image data for an output image to which an information image to be formed so as to be made difficult to be visually recognized with respect to background color has been added; developing portion for developing the electrostatic latent image with color toner into a color toner image; a transparent toner image forming portion for forming a transparent toner image located on the color image on a recording material; and an image processing portion for generating the exposure image data so that a toner amount of the information image on which the transparent toner image is superposed is less than that of the information image on which the transparent toner image is not superposed.

Abstract: An image forming apparatus includes a first image carrying member for carrying a first toner image; a second image carrying member for carrying a second toner image in a maximum amount, of the second toner image carried on the second image carrying member, larger than a maximum amount of the first image carried on the first image carrying member; a first transfer member for electrostatically transferring the first toner image onto a transfer medium in a first transfer nip formed by bringing the transfer medium into contact with the first, image bearing member; and a second transfer member for electrostatically transferring the second toner image onto the transfer medium in a second transfer nip formed by bringing the transfer medium into contact with the second bearing member so that a length of the second transfer nip with respect to a movement direction of the transfer member is longer than a length of the first transfer nip with respect to the movement direction.

Abstract: An image forming apparatus includes a first image carrying member for carrying a first toner image; a second image carrying member for carrying a second toner image in a maximum amount, of the second toner image carried on the second image carrying member, larger than a maximum amount of the first image carried on the first image carrying member; a first transfer member for electrostatically transferring the first toner image onto a transfer medium in a first transfer nip formed by bringing the transfer medium into contact with the first image carrying member; and a second transfer member for electrostatically transferring the second toner image onto the transfer medium in a second transfer nip formed by bringing the transfer medium into contact with the second carrying member so that a length of the second transfer nip with respect to a movement direction of the second transfer member is longer than a length of the first transfer nip with respect to the movement direction.

Abstract: An image forming apparatus includes a first image carrying member for carrying a first toner image; a second image carrying member for carrying a second toner image in a maximum amount, of the second toner image carried on the second image carrying member, larger than a maximum amount of the first image carried on the first image carrying member; a first transfer member for electrostatically transferring the first toner image onto a transfer medium in a first transfer nip formed by bringing the transfer medium into contact with the first image bearing member; and a second transfer member for electrostatically transferring the second toner image onto the transfer medium in a second transfer nip formed by bringing the transfer medium into contact with the second bearing member so that a length of the second transfer nip with respect to a movement direction of the transfer member is longer than a length of the first transfer nip with respect to the movement direction.

Abstract: An image forming apparatus includes a first image forming station for forming, on the basis of an input signal indicative of an image, a toner image on a recording material with such a toner of toners having the same hue and different lightness as has a predetermined color and a low lightness; a second image forming station for forming, on the basis of an input signal indicative of an image, a toner image on the recording material with such a toner of the toners having the same hue and different lightness as has the predetermined color and a high lightness; changing means for changing a toner amount per unit area in each of the first image forming station and the second image forming station in accordance with a density level indicated by the image input signal for the predetermined color so that in a low density range, the toner amount per unit area is larger in the second image forming station than in the first image forming station; a first residual toner container for accommodating toner removed by first

Abstract: A developing apparatus having: a first developer carrying member close to a developer regulating member for regulating an amount of developer; a second developer carrying member to which the developer is delivered from the first developer carrying member; and a mode for removing the toner on the surface of the second developer carrying member, in which mode, in a non-image-formation period, no toner transfer operation from the first developer carrying member to an image bearing member is substantially performed, but a toner transfer operation from the second developer carrying member to the image bearing member is performed.