Incremental printing of symbolic information – Ink jet – Ejector mechanism
Reexamination Certificate
1997-07-28
2001-07-10
Barlow, John (Department: 2853)
Incremental printing of symbolic information
Ink jet
Ejector mechanism
C347S058000
Reexamination Certificate
active
06257703
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to an ink jet recording head for ejecting ink to a recording surface of a recording medium to obtain a recorded image thereon.
2. Related Background Art
There are practically available ink jet recording devices for selectively ejecting ink from a plurality of ink ejection outlets onto the recording surface of recording medium, based on recording data, thereby depositing the ink on the recording surface to form an image. Such ink jet recording devices have an ink jet recording head selectively mounted on a carriage portion, which is disposed opposite to the recording surface of recording medium and which is arranged to undergo scanning in directions perpendicular to the conveying direction of the recording medium.
The ink jet recording head of a side shooter type is comprised, for example as shown in
FIG. 25
, of main body section
2
consisting of ink supply section
2
B, to which ink tank IT is mounted, and input terminal section
2
A electrically connected to the carriage portion not illustrated and receiving a drive control signal group from the carriage portion; recording element board
6
joined to a joined surface in the ink supply section
2
B of the main body section
2
; and printed wiring board
4
electrically connected to the recording element board
6
and supplying the drive control signal group from the input terminal section
2
A thereto.
The ink supply section
2
B in the main body section
2
is formed, for example, in such a manner that block piece
8
made of an aluminum alloy is integrally molded in a resin, as shown in FIG.
26
A. The ink supply section
2
B is provided with ink supply passage
2
a
for guiding the ink from the ink tank IT thereinto. One opening end of the ink supply passage
2
a
is open in the joined surface
2
b
including a portion exposed to the outside in the block piece
8
.
The recording element board
6
is comprised, as shown in FIG.
26
B and
FIG. 29
, of substrate
10
having ink supply opening portion
10
c
in communication with the opening end of the ink supply passage
2
a
in the ink supply section
2
B, partition member
12
for forming a plurality of ink branching supply passages
12
a
provided respectively corresponding to heaters
10
a
as ink heating portions in the substrate
10
, and orifice plate
14
in which a plurality of ink ejection outlets
14
a
are arrayed in two parallel strings and opposite to the respective heaters
10
a
in the substrate
10
.
The substrate
10
in the recording element board
6
is made of, for example, a silicon material of the thickness of 0.5 to 1.0 mm. Provided in the surface of the substrate
10
bonded to the joined surface
2
b
of the ink supply section
2
B with an adhesive is ink supply opening portion
10
c
extending in the array direction of the ink ejection outlets
14
a
and opposite to the orifice plate
14
, as shown in FIG.
27
A and FIG.
26
B.
Further, the heaters
10
a
are arranged at predetermined mutual intervals on either side of the ink supply opening portion
10
c
in the substrate
10
. One ends of the ink branching supply passages
12
a
in the partition member
12
are in communication with the ink supply opening portion
10
c
and each ink branching supply passage
12
a
is arranged to guide the ink supplied through the ink supply opening portion
10
c
to the associated heater
10
a.
The printed wiring board
4
is electrically connected to each electrode
10
b
of the substrate
10
in the recording element board
6
, as shown in FIG.
29
. The printed wiring board
4
has recording element board receiving section
4
B in which the recording element board
6
is placed, and terminal section
4
A disposed in the input terminal section
2
A in the main body section
2
.
In this arrangement, when a drive control signal is supplied to each heater
10
a
of the substrate
10
in the recording element board
6
through the printed wiring board
4
to heat the heater
10
a,
the ink introduced through the ink branching supply passages
12
a
is heated, bubbles are generated therein by the film boiling phenomenon, and with expansion of the bubbles thus generated, the ink is ejected from the ink ejection outlets
14
a
toward the recording surface of recording medium.
In the arrangement wherein the recording element board
6
in the printed wiring board
4
fixed to the main body section
2
is bonded to the joined surface
2
b
in the main body section
2
with the adhesive as described above, when the recording element board
6
is excited into the recording operation state as described above, the temperature of the block piece
8
in the joined surface
2
b
in the main body section
2
increases as the temperature of the recording element board
6
increases. This causes the recording element board
6
and block piece
8
to thermally expand. However, since there is a difference between an expansion coefficient of the recording element board
6
made of silicon and an expansion coefficient of the block piece made of the aluminum alloy, there would occur some cases wherein the recording element board
6
is deformed so that the arrays of ink ejection outlets near the central portion are so curved as to approach each other as deviating from the straight line as shown in
FIG. 28
, or cases wherein the recording element board
6
is broken. Especially, when a thermosetting adhesive is used, it might be deformed or broken.
In such cases, it is also conceivable to increase the thickness or the surface area in order to enhance the rigidity of the recording element board
6
, but it is not wise, because it also increases the manufacturing cost of the recording element board
6
.
SUMMARY OF THE INVENTION
In consideration of the above problem, an object of the present invention is to provide an ink jet recording head for ejecting the ink to the recording surface of recording medium to obtain the recorded image thereon, wherein, in bonding fixation of the recording element board to the main body section, the recording element board is prevented from breaking with change in the temperature of the recording element board, without increasing the manufacturing cost of the recording element board.
For achieving the above object, an ink jet recording head according to the present invention is an ink jet recording head comprising: a main body section having a joined surface in which one end of an ink supply passage for introducing ink from an ink reserving portion is open; a support member having a first joint surface joined to the joined surface in the main body section and a second joint surface disposed opposite to the first joint surface, the support member having a communicating passage in communication with the one end of the ink supply passage; and a recording element board comprising an ink heating portion disposed on the second joint surface of the support member and arranged to heat the ink supplied through the communicating passage, and an ink ejection outlet forming portion in which an ink ejection outlet for ejecting the ink heated by the ink heating portion is formed; wherein thermal properties in materials of the recording element board and the support member are of the same quality.
Another ink jet recording head according to the present invention is an ink jet recording head comprising: a main body section having a joined surface in which one end of an ink supply passage for introducing ink from an ink reserving portion is open; a first support member having a first joint surface joined to the joined surface in the main body section and a second joint surface disposed opposite to the first joint surface, the support member having a communicating passage in communication with the one end of the ink supply passage; a second support member joined to the second joint surface of the first support member; and a recording element board comprising an ink heating portion disposed inside the second support member, joined to the second joint surface of the first support member, an
Hirosawa Toshiaki
Kawamura Shogo
Morita Osamu
Sato Osamu
Barlow John
Brooke Michael S
Canon Kabushiki Kaisha
Fitzpatrick ,Cella, Harper & Scinto
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