EP0936069A2
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EP
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Ink-jet head driving device
Assignee: Toshiba Tec Corp
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Filing: 1999-02-10
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Granted: —
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Expires: 2019-02-10
Abstract
Abstract In an ink-jet head driving device, data of a shift register is latched by a latch circuit (3). The data latched by the latch circuit is input to energization signal selection circuits (5). At this time, each selection circuit receives 1-bit data for operating a corresponding ink chamber (46), and 2-bit data for operating adjacent ink chambers (46) as reference data. Each selection circuit selects one from energization signals (TP1 to TP8) using the 3-bit data, and supplies the selected energization signal to a corresponding head driver, thereby generating a drive waveform for driving the ink chamber (46).
Inventors
- 👤 Jun Takamura
- 👤 Noboru Nitta
- 👤 Shunichi Ono
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-09 10:15
CPC Classifications
B; B41; B41J; B41J2/00; B41J2/005; B41J2/01; B41J2/015; B41J2/04; B41J2/045; B41J2/04501; B41J2/04525; B41J2/04541; B41J2/04543; B41J2/0458; B41J2/04581
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
154 words
An ink-jet head driving device for an ink-jet
head (HD) having a line of ink chambers, characterized
by comprising: a reception unit (2, 3; 12, 13; 21, 13; 30, 33; 33,
34) for receiving dot data corresponding to each ink
chamber (46) of the print head (HD); a decoding unit (32) for selectively decoding
(j+k)-bit data made up of received j-bit dot data
(j ≧ 1) of a target ink chamber (46) end k-bit dot data
(k ≧ 1) of neighboring ink chambers (46); an input unit (TP1-TP8; TP1-TP16; TP1-TP3) for
inputting a plurality of energization signals; and a selection unit (31) for selecting one
energization signal from the plurality of energization
signals; wherein the selection unit (31) is arranged to
determine an energization signal to be selected based
on a decoding result of the decoding and to drive the
target ink chamber (46) with a waveform obtained by the
energization signal selected thereby.
Claim 2
Dependent Claim
38 words
A driving device according to claim 1, characterized
in that the k-bit dot data of the neighboring
ink chamber (46) is j-bit data representing a logical
sum of two adjacent ink chambers (46) which can be
simultaneously driven.
Claim 3
Dependent Claim
43 words
A driving device according to claim 1, characterized
in that the k-bit dot data of the neighboring
ink chamber (46) is flag data representing that data
for printing is present in one of two adjacent ink
chambers (46) that can be simultaneously driven.
Claim 4
Dependent Claim
43 words
A driving device according to claim 1, characterized
in that the k-bit dot data of the neighboring
ink chamber (46) is flag data representing that dot
data for printing is present in both two adjacent ink
chambers (46) that can be simultaneously driven.
Claim 5
Dependent Claim
33 words
A driving device according to claim 1, characterized
in that a neighboring ink chamber (46) to be
referred by said selection unit (31) for each ink
chamber (46) is changeable in reception operation.
Claim 6
Dependent Claim
98 words
A driving device according to claim 1, characterized
in that said reception unit is arranged to receive a
maximum of n-bit dot data, and has a reception path
change unit (11, 26) for changing a dot data reception
path depending on the number m of bits when dot data of
m (< n) bits is to be received, thereby causing dot
data of an ink chamber (46) and dot data of a
neighboring ink chamber (46) to be input to said
reception unit (2, 3; 12, 13; 21, 13; 30, 33; 33, 34)
for said ink chamber (46).
Claim 7
Dependent Claim
90 words
A driving device according to claim 6, characterized
in that said reception unit includes multiple
n-bit parallel shift registers (SF1 - SFk) for
receiving a maximum of n-bit parallel dot data, and
said reception path change unit comprises a conversion
unit (11) for serial/parallel-converting serial dot
data of m (1 ≦ m ≦ n) bits every m bits, and a
transfer unit (11) for transferring the parallel dot
data converted by said conversion unit (11) to said
multiple n-bit parallel shift registers (SF1 - SFk) in
units of m bits.
Claim 8
Dependent Claim
60 words
A driving device according to claim 7, characterized
in that when printing of one line completes,
and said multiple n-bit parallel shift registers newly
receive parallel dot data for printing of next one line,
dummy data is added to the serial dot data so as not to
leave previous dot data in said n-bit parallel shift
registers (SF1 - SFk).
Claim 9
Dependent Claim
95 words
A driving device according to claim 6, characterized
in that said reception unit includes multiple
n-bit shift registers (FS1 - FSk) for receiving a
maximum of n-bit serial dot data, and said reception
path change unit includes a transfer unit (26) for,
when the number of bits of dot data to be received is
given by m (1 ≦ m ≦ n ) bits, shifting m-bit serial dot
data, then shifting the serial dot data to an output
stage within an own shift register, and transferring
the serial dot data to a next shift register.
Claim 10
Dependent Claim
56 words
A driving device according to claim 9, characterized
in that when printing of one line completes,
and said multiple shift registers newly receive serial
dot data for printing of next one line, dummy data is
added to the serial dot data so as not to leave
previous dot data in said shift registers (FS1 - FSk).
Claim 11
Dependent Claim
74 words
A driving device according to claim 1, characterized
in that said print head (HD) is constituted not
to simultaneously eject ink from adjacent ink chambers
(46), and when each ink chamber (46) is driven by
selecting one from a plurality of energization signals
in a group of ink chambers (46) which can
simultaneously eject ink, refers to dot data of an ink
chamber (46) neighboring to the target ink chamber (46)
in the group.
References Cited (Backward Citations)
JPS63280332A
Cited
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