Printing apparatus
First Claim
1. A printing apparatus capable of printing image dots for character data with a plurality of printing resolutions, comprising:
- receiving means for receiving dot information according to an image input from a host computer;
first storing means for storing the dot information received by said receiving means;
printing resolution selection means for selecting one from the plurality of printing resolutions, an image dot formed with one printing resolution being different in size from an image dot formed with another printing resolution;
second storing means for storing a set of smoothing interpolation data for each printing resolution of the plurality of printing resolutions, respectively, a dot set by one set of smoothing interpolation data being different in size from a dot set by another set of smoothing interpolation data;
selecting means for selecting the set of smoothing interpolation data according to the printing resolution selected by said printing resolution selection means;
interpolation dot information generating means for generating smoothing interpolation dot information from the set of smoothing interpolation data selected by said selecting means from the sets of smoothing interpolation data stored in said second storing means; and
image data output means for outputting image data based on the dot information stored in said first storing means and the smoothing interpolation dot information generated by said interpolation dot information generating means.
1 Assignment
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Accused Products
Abstract
An interpolation dot generating circuit having a determination circuit, a selecting circuit, and interpolation data A for 300 dpi and the interpolation data B for 600 dpi. A one of the interpolation data A or B is selected based on a signal output from a selection switch which shows a resolution of 300 dpi or 600 dpi. If interpolation dot data is generated from the interpolation data A or B, selected by the determination circuit, the dot data from the line memory and the generated interpolation dot data are output to the data selector. The data selector outputs image information VDO based on the dot information and the interpolation dot data output thereto. Therefore, a printing output with higher-quality can be obtained since a high dot density and high-level gradation in compliance with the preset resolution is produced. As a result, a nicely appearing and accurate image can be recorded.
47 Citations
16 Claims
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1. A printing apparatus capable of printing image dots for character data with a plurality of printing resolutions, comprising:
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receiving means for receiving dot information according to an image input from a host computer; first storing means for storing the dot information received by said receiving means; printing resolution selection means for selecting one from the plurality of printing resolutions, an image dot formed with one printing resolution being different in size from an image dot formed with another printing resolution; second storing means for storing a set of smoothing interpolation data for each printing resolution of the plurality of printing resolutions, respectively, a dot set by one set of smoothing interpolation data being different in size from a dot set by another set of smoothing interpolation data; selecting means for selecting the set of smoothing interpolation data according to the printing resolution selected by said printing resolution selection means; interpolation dot information generating means for generating smoothing interpolation dot information from the set of smoothing interpolation data selected by said selecting means from the sets of smoothing interpolation data stored in said second storing means; and image data output means for outputting image data based on the dot information stored in said first storing means and the smoothing interpolation dot information generated by said interpolation dot information generating means. - View Dependent Claims (2, 3, 4, 10)
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5. A method of printing image dots for character data using one of a plurality of printing resolutions, comprising the steps of:
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storing a set of edge smoothing interpolation data for each printing resolution of the plurality of printing resolutions in a first storing means of a print apparatus, a dot set by one set of edge smoothing interpolation data being different in size from a dot set by another set of edge smoothing interpolation data; inputting dot information to be printed into a second storing means; selecting one printing resolution from the plurality of printing resolutions, an image dot formed with one printing resolution being different in size from an image dot formed with another printing resolution; selecting one set of edge smoothing interpolation data according to the printing resolution selected; generating interpolation dot data on a basis of the set of edge smoothing interpolation data selected during said interpolation data selecting step from the plurality of sets of edge smoothing interpolation data stored in said first storing means; outputting image data based on the dot information stored in said second storing means and the generated interpolation dot information; and providing the output image data as input data to a print engine. - View Dependent Claims (6, 7, 8, 9)
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11. A print apparatus for printing image dots for character data using one of a plurality of printing resolutions, comprising:
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first storing means in the print apparatus for storing a plurality of sets of edge smoothing interpolation data corresponding to the plurality of printing resolutions, a dot set by one set of edge smoothing interpolation data being different in size from a dot set by another set of edge smoothing interpolation data; means for inputting data to be printed; second storing means for storing dot data of the input data to be printed; printing resolution selection means for selecting one printing resolution from the plurality of printing resolutions, an image dot formed with one printing resolution being different in size from an image dot formed with another printing resolution; selecting means for selecting one set of edge smoothing interpolation data stored in said first storing means according to the printing resolution selected; means for generating edge smoothing interpolation dot data on a basis of the set of edge smoothing interpolation data selected by said selecting means; image data output means for outputting image data based on the dot information stored in said second storing means and the edge smoothing interpolation dot information generated by said interpolation dot information generating means; and means for providing the output image data as input data to a print engine. - View Dependent Claims (12, 13, 14, 15, 16)
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Specification