EP0132794A2
Expired / Lapsed
EP
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Method and apparatus for thermal half tone printing
Assignee: Fujifilm Business Innovation Corp
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Filing: 1984-07-19
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Granted: —
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Expires: 2004-07-19
Abstract
Abstract Each picture element is made to correspond to a plurality of dots and the ratios of printing energy corresponding to respective dots in each picture element are determined to correspond to respective tones. The heat accumulation state of a heat generating member corresponding to a picture element to be printed is detected from the tones of picture elements about the picture element to be printed for controlling the printing energy supplied to the heat generating members corresponding to respective dots of the picture image to be printed in accordance with the printing energy ratio and the detected state. With this method it is possible to provide a half tone print having uniform high quality regardless of the tone of a previous line and tones of surrounding picture elements.
Inventors
- 👤 Toshiharu C/O Fuji Xerox Co. Ltd. Inui
- 👤 Haruhiko C/O Fuji Xerox Co. Ltd. Moriguchi
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-09 16:24
CPC Classifications
H; H04; H04N; H04N1/00; H04N1/40; H04N1/40025; H04N1/4005; H04N1/40031; H04N1/40081
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
150 words
A method of thermal half tone printing wherein each picture element is made to correspond to a plurality of dots, and the number of printed dots in said picture element and the size or brightness of respective printed dots are vared in accordance with a tone of a picture element to be printed so as to represent a half tone image, characterised in that there are provided steps of: determining printing energy ratios corresponding to respective dots in said picture element in accordance with respective tones; calculating a heat accumulation state of heat generating members corresponding to a picture element in accordance with tones of picture elements in the neighborhood of said picture element to be printed, and controlling printing energy supplied to heat generating members corresponding to respective dots of said picture element to be printed in accordance with said printing energy ratio and said calculated heat accumulation state.
Claim 2
Independent Claim
150 words
A method of thermal half tone printing wherein each picture element is made to correspond to a plurality of dots, and the number of printed dots in said picture element and the size or brightness of respective printed dots are vared in accordance with a tone of a picture element to be printed so as to represent a half tone image, characterised in that there are provided steps of: determining printing energy ratios corresponding to respective dots in said picture element in accordance with respective tones; calculating a heat accumulation state of heat generating members corresponding to a picture element in accordance with tones of picture elements in the neighborhood of said picture element to be printed, and controlling printing energy supplied to heat generating members corresponding to respective dots of said picture element to be printed in accordance with said printing energy ratio and said calculated heat accumulation state.
Claim 3
Dependent Claim
29 words
The method according to claim 1, characterised in that said printing energy is controlled by varying widths of pulses applied to the heat generating members corresponding to respective dots.
Claim 4
Independent Claim
30 words
The method according to claim-1, characterised in that said printing energy is controlled by varying an interval of applying said pulses to said heat generating members corresponding to respective dots.
Claim 5
Dependent Claim
30 words
The method according to claim 1, characterised in that said printing energy is controlled by varl;ying a voltage level of pulses applied to heat generating members corresponding to said dots.
Claim 6
Dependent Claim
39 words
The method according to claim 1, characterised in that said calculation of said heat accumulation state of a heat generating member corresponding to an influence upon said picture element from picture elements in the neighborhood of said picture element.
Claim 7
Dependent Claim
48 words
The method according to claim 1, characterised in that said calculation of said heat accumulation state of a heat generating member corresponding to a picture element to be printed is made by correcting a time corresponding to a receiving period or a waiting time of a picture signal.
Claim 8
Dependent Claim
163 words
Apparatus for thermal half tone printing wherein each picture element is made to correspond to a plurality of dots and the number of printed dots in said picture element, and the size or brightness of respective printed dots is varied in accordance with a tone of a picture element to be printed so as to represent a half tone picture element, characterised in that there are provided: means for determining a ratio of printing energy corresponding to respective dots in a picture element in accordance with respective tones; means for calculating a heat accumulation state of heat generating members corresponding to said picture element to be printed in accordance with tones of picture elements in the neighborthood of said picture element to be prited; and means for controlling printing energy supplied to heat generating members corresponding to respective dots of said picture element to be printed in accordance with said ratio of said printing energy and a value calculated by said calculating means.
Claim 9
Dependent Claim
163 words
Apparatus for thermal half tone printing wherein each picture element is made to correspond to a plurality of dots and the number of printed dots in said picture element, and the size or brightness of respective printed dots is varied in accordance with a tone of a picture element to be printed so as to represent a half tone picture element, characterised in that there are provided: means for determining a ratio of printing energy corresponding to respective dots in a picture element in accordance with respective tones; means for calculating a heat accumulation state of heat generating members corresponding to said picture element to be printed in accordance with tones of picture elements in the neighborthood of said picture element to be prited; and means for controlling printing energy supplied to heat generating members corresponding to respective dots of said picture element to be printed in accordance with said ratio of said printing energy and a value calculated by said calculating means.
References Cited (Backward Citations)
No citation records indexed.
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