Image forming apparatus
First Claim
1. A photoreceptor cleanerless image forming apparatus to overlappingly form yellow, magenta, cyan, and black toner images,wherein said apparatus includes a control section that is configured to decrease color mixture or exposure error based on controlling an exposure intensity,wherein said apparatus comprises four photoreceptor cleanerless image forming units each including at least a photoreceptor, a charger, an exposure apparatus, and a developing apparatus for overlappingly forming yellow, magenta, cyan, and black images;
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exposure intensities Iy, Ic, Im, and Ik to satisfy conditions of Ik≧
Ic, Ik≧
Im, and Ik>
Iy, where said exposure intensities ly, Ic, Im, and Ik correspond to exposure sources for respective exposure apparatuses in respective of said image forming units to form yellow, magenta, cyan, and black images, respectively, andexposure resolutions Ry, Rm, Rc, and Rk to satisfy conditions of Rk≦
Rc, Rk ≦
Rm, and Rk≦
Ry, where said exposure resolutions Ry, Rm, Rc, and Rk correspond to exposure apparatuses in image forming units to form yellow, magenta, cyan, and black images, respectively, andwherein volume-based average particle diameters Pa, Pb, Pc, and Pd satisfy conditions of Pb≧
Pd, Pc≧
Pd, and Pa>
Pd, where Pa, Pb, Pc, and Pd indicate volume-based average particle diameters of toners to be developed on a photoreceptor in the order of development.
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Accused Products
Abstract
There is provided a photoreceptor cleanerless image forming apparatus capable of decreasing color mixture or an exposure error due to reverse transfer toner or untransferred toner.
An image forming apparatus 100 according to the present invention comprises four image forming units 100a, 100b, 100c, and 100d configured to be photoreceptor cleanerless in a 4-drum tandem manner. Each image forming unit includes a photoreceptor 103a, 103b, 103c, or 103d, a charger 105a, 105b, 105c, or 105d, an exposure apparatus 106a, 106b, 106c, or 106d, and a developing apparatus 109a, 109b, 109c, or 109d. When exposure intensities Iy, Ic, Im, and Ik are assumed for exposure sources of the exposure apparatuses in the image forming units which form yellow, magenta, cyan, and black images, respectively, the exposure intensities are configured to satisfy conditions of Ik≧Ic≧Im≧Iy and Ik>Iy. This decreases an exposure error (image hysteresis) in an image formed on paper.
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Citations
40 Claims
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1. A photoreceptor cleanerless image forming apparatus to overlappingly form yellow, magenta, cyan, and black toner images,
wherein said apparatus includes a control section that is configured to decrease color mixture or exposure error based on controlling an exposure intensity, wherein said apparatus comprises four photoreceptor cleanerless image forming units each including at least a photoreceptor, a charger, an exposure apparatus, and a developing apparatus for overlappingly forming yellow, magenta, cyan, and black images; - and
the control section configured to control; exposure intensities Iy, Ic, Im, and Ik to satisfy conditions of Ik≧
Ic, Ik≧
Im, and Ik>
Iy, where said exposure intensities ly, Ic, Im, and Ik correspond to exposure sources for respective exposure apparatuses in respective of said image forming units to form yellow, magenta, cyan, and black images, respectively, andexposure resolutions Ry, Rm, Rc, and Rk to satisfy conditions of Rk≦
Rc, Rk ≦
Rm, and Rk≦
Ry, where said exposure resolutions Ry, Rm, Rc, and Rk correspond to exposure apparatuses in image forming units to form yellow, magenta, cyan, and black images, respectively, andwherein volume-based average particle diameters Pa, Pb, Pc, and Pd satisfy conditions of Pb≧
Pd, Pc≧
Pd, and Pa>
Pd, where Pa, Pb, Pc, and Pd indicate volume-based average particle diameters of toners to be developed on a photoreceptor in the order of development. - View Dependent Claims (6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37)
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2. A photoreceptor cleanerless image forming apparatus to overlappingly form yellow, magenta, cyan, and black toner images,
wherein said apparatus includes a control section that is configured to decrease color mixture or exposure error based on controlling an exposure intensity, wherein said apparatus is a 4-drum tandem image forming apparatus comprising four photoreceptor cleanerless image forming units each including at least a photoreceptor, a charger, an exposure apparatus, and a developing apparatus for overlappingly forming yellow, magenta, cyan, and black images; - and
the control section configured to control; exposure intensities ly, Ic, Im, and Ik to satisfy conditions of Ik≧
Ic, Ik≧
Im, and Ik>
Iy, where said exposure intensities Iy, Ic, Im, and Ik correspond to exposure sources for respective exposure apparatuses in respective of said image forming units to form yellow, magenta, cyan, and black images, respectively, andexposure resolutions Ry, Rm, Rc, and Rk to satisfy conditions of Rk≦
Rc, Rk ≦
Rm, and Rk≦
Ry, where said exposure resolutions Ry, Rm, Rc, and Rk correspond to exposure apparatuses in image forming units to form yellow, magenta, cyan, and black images, respectively, andwherein volume-based average particle diameters Pa, Pb, Pc, and Pd satisfy conditions of Pb≧
Pd, Pc≧
Pd, and Pa>
Pd, where Pa, Pb, Pc, and Pd indicate volume-based average particle diameters of toners to be developed on a photoreceptor in the order of development. - View Dependent Claims (3, 4, 5)
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38. A photoreceptor cleanerless image forming apparatus to overlappingly form yellow, magenta, cyan, and black toner images, comprising:
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a control means for decreasing color mixture or exposure error based on controlling an exposure intensity, wherein said apparatus is a 4-drum tandem image forming apparatus comprising four photoreceptor cleanerless image forming units each including at least a photoreceptor, a charger, an exposure apparatus, and a developing apparatus for overlappingly forming yellow, magenta, cyan, and black images; and the control means for controlling; exposure intensities Iy, Ic, Im, and Ik to satisfy conditions of Ik≧
Ic, Ik≧
Im, and Ik>
Iy, where said exposure intensities Iy, Ic, Im, and Ik correspond to exposure sources for respective exposure apparatuses in respective of said image forming units to form yellow, magenta, cyan, and black images, respectively, andexposure resolutions Ry, Rm, Rc, and Rk to satisfy conditions of Rk≦
Rc, Rk ≦
Rm, and Rk≦
Ry, where said exposure resolutions Ry, Rm, Rc, and Rk correspond to exposure apparatuses in image forming units to form yellow, magenta, cyan, and black images, respectively, andwherein volume-based average particle diameters Pa, Pb, Pc, and Pd satisfy conditions of Pb≧
Pd, Pc≧
Pd, and Pa>
Pd, where Pa, Pb, Pc, and Pd indicate volume-based average particle diameters of toners to be developed on a photoreceptor in the order of development.
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39. A photoreceptor cleanerless image forming apparatus to overlappingly form yellow, magenta, cyan, and black toner images, comprising:
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four photoreceptor cleanerless image forming units each including at least a photoreceptor, a charger, an exposure apparatus, and a developing apparatus for overlappingly forming yellow, magenta, cyan, and black images; and a control means for decreasing color mixture or exposure error based on controlling an exposure intensity, the control means for controlling; exposure intensities Iy, Ic, Im, and Ik to satisfy conditions of Ik≧
Ic, Ik≧
Im and Ik>
Iy, where said exposure intensities Iy, Ic, Im, and Ik correspond to exposure sources for respective exposure apparatuses in respective of said image forming units to form yellow, magenta, cyan, and black images, respectively, andexposure resolutions Ry, Rm, Rc, and Rk to satisfy conditions of Rk≦
Rc, Rk ≦
Rm, and Rk≦
Ry, where said exposure resolutions Ry, Rm, Rc, and Rk correspond to exposure apparatuses in image forming units to form yellow, magenta, cyan, and black images, respectively, andwherein volume-based average particle diameters Pa, Pb, Pc, and Pd satisfy conditions of Pb≧
Pd, Pc≧
Pd, and Pa>
Pd, where Pa, Pb, Pc, and Pd indicate volume-based average particle diameters of toners to be developed on a photoreceptor in the order of development.
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40. A photoreceptor cleanerless image forming apparatus to overlappingly form yellow, magenta, cyan, and black toner images, comprising:
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four photoreceptor cleanerless image forming units, each unit comprising; a photoreceptor; a charger; an exposure apparatus comprising a semiconductor laser with a red or near-infrared area whose center wavelength is 630 nm or more; and a developing apparatus for overlappingly forming yellow, magenta, cyan, and black images; and a control section configured to decrease color mixture or exposure error based on controlling an exposure intensity, the control section configured to control; exposure intensities Iy, Ic, Im, and Ik to satisfy conditions of Ik≧
Ic, Ik≧
Im, and Ik>
Iy, where said exposure intensities Iy, Ic, Im, and Ik correspond to exposure sources for respective exposure apparatuses in respective of said image forming units to form yellow, magenta, cyan, and black images, respectively, andexposure resolutions Ry, Rm, Rc, and Rk to satisfy conditions of Rk≦
Rc, Rk ≦
Rm, and Rk≦
Ry, where said exposure resolutions Ry, Rm, Rc, and Rk correspond to exposure apparatuses in image forming units to form yellow, magenta, cyan, and black images, respectively, andwherein volume-based average particle diameters Pa, Pb, Pc, and Pd satisfy conditions of Pb≧
Pd, Pc≧
Pd, and Pa>
Pd, where Pa, Pb, Pc, and Pd indicate volume-based average particle diameters of toners to be developed on a photoreceptor in the order of development,the control section configured to control each image forming unit to adjust a transfer condition such that the sum of mass per unit area for untransferred toner and reverse transfer toner becomes 100[g/cm2] or less during transfer of a solid image.
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Specification