EP0824243A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Printing apparatus with registration of line print heads
Assignee: Canon Inc
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Filing: 1997-08-04
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Granted: —
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Expires: 2017-08-04
Abstract
Abstract When a position deviation of more than 1/2 pitch of ejection port pitch is generated by a difference in thermal expansion between ejection ports (No. 7 to No. 12) of a low temperature line head and ejection ports (No. 7 to No. 12) of high temperature line head, a dummy data (D6') is inserted in part of ejection data arrangement (D1 to D12), so that ejection data (D7 to D12) inherent in the arrangement is shifted by one ejection port unit to be assigned to other ejection ports This reduces position deviation between dots formed by individual heads according to the data (D1 to D12) to less than 1/2 pitch. <IMAGE>
Inventors
- 👤 Masashi Kamada
- 👤 Takayuki Ninomiya
- 👤 Kazuhiko Morimura
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-09 14:56
CPC Classifications
G; G06; G06K; G06K15/00; G06K15/02; G06K15/10
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
133 words
A printing apparatus for performing printing on
a printing medium, by using a plurality of print
heads each having a plurality of printing elements
arranged in a predetermined direction, characterized
by comprising: head temperature data obtaining means for
obtaining temperature data of each of the plurality
of print heads; driving data supply means for supplying driving
data for driving the plurality of printing elements
of each of the plurality of print heads to said each
of the plurality of print heads in accordance with
an arrangement of said plurality of printing
elements; and dummy data insertion means for inserting dummy
data into the driving data supplied by said driving
data supply means based on the temperature data of
each of said plurality of print heads obtained by
said head temperature data obtaining means.
Claim 2
Dependent Claim
53 words
A printing apparatus as claimed in Claim 1,
characterized in that said dummy data insertion
means inserts the dummy data into the driving data
in accordance with differences in thermal expansion
between the plurality of print heads, said
differences in thermal expansion corresponding to
respective temperature data of said plurality of
print heads.
Claim 3
Dependent Claim
64 words
A printing apparatus as claimed in Claim 2,
characterized in that, in relation to the print head
of which temperature data is obtained as the highest
temperature between the plurality of the print
heads, said dummy data insertion means inserts the
dummy data into the driving data for the print head
of which temperature data is obtained as lower
temperature than the highest temperature.
Claim 4
Dependent Claim
53 words
A printing apparatus as claimed in Claim 3,
characterized in that said dummy data insertion
means inserts the dummy data into the driving data
when the difference in thermal expansion calculated
based on a temperature difference between the lower
temperature and the highest temperature is greater
than or equal to a predetermined value.
Claim 5
Dependent Claim
81 words
A printing apparatus as claimed in Claim 4,
characterized in that said dummy data insertion
means inserts the dummy data as driving data for the
printing element in the print head of the lower
temperature, a deviation of a position of said
printing element in the arrangement of the plurality
of printing elements from a position of the
corresponding printing element in the print head of
the highest temperature first becoming a value
greater than or equal to the predetermined value.
Claim 6
Dependent Claim
34 words
A printing apparatus as claimed in Claim 5,
characterized in that each of the plurality of print
heads arranges a plurality of printing elements in
accordance with a width of the printing medium fed.
Claim 7
Dependent Claim
26 words
A printing apparatus as claimed in Claim 6,
characterized in that the plurality of print heads
perform printing of yellow, magenta, cyan, and black
colors respectively.
Claim 8
Dependent Claim
28 words
A printing apparatus as claimed in Claim 7,
characterized in that said head temperature data
obtaining means includes a temperature sensor
provided on the plurality of print heads.
Claim 9
Dependent Claim
47 words
A printing apparatus as claimed in Claim 8,
characterized in that the plurality of print heads
individually have an ink ejection port as a printing
element, and an ink is ejected from said ink
ejection port by a pressure of a bubble produced by
utilizing heat energy.
Claim 10
Dependent Claim
61 words
A printing apparatus as claimed in Claim 5,
characterized in that each of the plurality of print
heads have an excess printing element with respect
to a width of an image to be printed, and said
driving data supply means supplies the driving data
shifted due to inserting of the dummy data as the
driving data for said excess printing element.
Claim 11
Dependent Claim
19 words
A printing apparatus as claimed in Claim 1,
characterized in that the dummy data is a data
indicating non-printing.
Claim 12
Dependent Claim
30 words
A printing apparatus as claimed in Claim 1,
characterized in that the dummy data is a data of
the same content as the driving data adjacent to
said dummy data.
Claim 13
Dependent Claim
103 words
A position deviation adjusting method of a print
head in a printing apparatus using a plurality of
the print heads each having a plurality of printing
elements arranged in a predetermined direction and
performing printing on a printing medium, said
method characterized by comprising the steps of: obtaining a temperature data of each of the
plurality of print heads; and inserting a dummy data into a driving data supplied
in accordance with arrangement of the plurality of
printing elements and used for driving said plurality of
printing elements, on a basis of temperature data
obtained in each of the plurality of print heads.
Claim 14
Dependent Claim
56 words
A printing apparatus or method wherein means are
provided for modifying driving data for driving print
elements of a print head by adding dummy data, which
dummy data may be added for example in accordance with
a detected temperature of the print head for suppressing
deviation between dots printed by print heads having
different thermal characteristics.
References Cited (Backward Citations)
No citation records indexed.
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