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US 8,265,502 B2Granted
Image forming apparatus including an alternative printing unit
AssigneeFuji Xerox Co., Ltd.
InventorsNoribumi Sato, Mitsuru Iioka, Jun Koyatsu, Kaoru Yamauchi, Takaya Nagasaki
Life of this patent
Estimating the term…
Abstract
An image forming apparatus includes an alternative printing unit. The alternative printing unit performs alternative printing of a black image by mixing images of color materials of three colors of cyan, yellow, and magenta. The alternative printing unit includes a color material amount control unit that controls amounts of the respective color materials, which form the images of the color materials of the three colors, so as to be smaller than those at a time of normal printing.
Claims22
An image forming apparatus comprising:
- an alternative printing unit that performs alternative printing of a black image by mixing images of color materials of three colors of cyan, yellow, and magenta, wherein
- the alternative printing unit includes a color material amount control unit that controls amounts of the respective color materials, which form the images of the color materials of the three colors, so as to be smaller than amounts of the respective color materials at a time of printing using a black color material.
An image forming apparatus comprising:
- an alternative printing unit that performs alternative printing of a black image by mixing images of color materials of three colors of cyan, yellow, and magenta, wherein
- the alternative printing unit includes a resolution control unit that controls resolutions of the images of the color materials of the three colors so as to be lower than resolutions of the images of the color materials of the three colors at a time of printing using a black color material.
An image forming apparatus comprising:
- an element identification unit that identifies an element of print data requested to be printed;
- and
- an alternative printing unit, wherein
- when the element identified by the element identification unit is a character element or a line-drawing element and when the element identified by the element identification unit meets a control condition based on a feature of the character element or a feature of the line-drawing element, the alternative printing unit performs alternative printing of a black image of the character element or the line-drawing element by mixing images of color materials of three colors of cyan, yellow, and magenta,
- the alternative printing unit includes an exposure light amount control unit, and when electrostatic latent images corresponding to the images of the color materials of the three colors are formed on a photoconductor, the exposure light amount control unit controls at least one of amounts of exposure light with which the photoconductor is exposed, so as to be lower than an amount of exposure light applied when using a black color material.
2 more elements
An image forming apparatus comprising:
- an element identification unit that identifies a element of print data requested to be printed;
- and
- an alternative printing unit, wherein
- when the element identified by the element identification unit is a character element or a line-drawing element and when the element identified by the element identification unit meets a control condition based on a feature of the character element or a feature of the line-drawing element, the alternative printing unit performs alternative printing of a black image of the character element or the line-drawing element by mixing images of color materials of three colors of cyan, yellow, and magenta,
- the alternative printing unit includes an exposure rate control unit, and when electrostatic latent images corresponding to the images of the color materials of the three colors are formed on a photoconductor, the exposure rate control unit controls an exposure rate of an actual exposure time to a unit pulse duration for a pixel of each image for exposing the photoconductor so as to be decreased to be smaller than that at the time of printing using a black color material.
2 more elements
Dependencies are inferred from the claim text.