Incremental printing of symbolic information – Ink jet – Ejector mechanism
Reexamination Certificate
2003-02-11
2003-12-09
Nguyen, Judy (Department: 2853)
Incremental printing of symbolic information
Ink jet
Ejector mechanism
C347S065000
Reexamination Certificate
active
06659595
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a liquid jet recording head that jets a liquid such as a recording liquid or the like from discharge ports (orifices) and forms droplets.
2. Description of the Related Art
Recording apparatuses having functions of a printer, a copier, a facsimile or the like, or recording apparatuses used as a multifunction electronic machine including a computer, a word processor and the like, or as an output device of a work station, are structured so as to record images on a medium to be recorded such as a recording paper, a plastic thin plate or the like on the basis of image information. These kinds of recording apparatuses can be classified into an ink jet system, a wire dot system, a thermal system, a laser beam system and the like in accordance with the recording system.
In a serial type recording apparatus that uses a recording system main-scan in a direction intersecting a conveying direction (sub-scanning direction) of the medium to be recorded, the medium to be recorded is set at a predetermined recording position. Thereafter, by repeating the operations of recording (main scan) the image by recording means loaded on a carriage moving along the medium to be recorded, and feeding a predetermined amount of paper (pitch-feeding) after one line has been recorded, and thereafter, recording (main scan) the image of the next line, recording of the entire image on the medium to be recorded is carried out.
On the other hand, in a line type recording apparatus in which recording is carried out by only sub-scanning in the conveying direction of the medium to be recorded, the medium to be recorded is set at a predetermined recording position. By sequentially repeating operations, after recording of one line is collectively carried out, of feeding a predetermined amount of paper (pitch feeding) and then collectively recording the next line, recording of the entire image is carried out on the medium to be recorded.
As typical recording apparatuses which use such serial type and line type liquid jet systems, there is a recording apparatus in which a liquid jet recording head is loaded. Such a recording apparatus is a so-called non-impact recording system recording apparatus, and can carry out high-speed recording and recording for various types of median to be recorded, and has the features that noise at the time of recording does not substantially arise.
Among such liquid jet recording heads, in particular, a liquid jet recording head which discharges a recording liquid by utilizing thermal energy can form a flow path at a high density and can be made more compact, by forming an electrical thermal converter, an electrode, a flow path wall, a top plate, an orifice plate and the like which are film-formed on a substrate through a semiconductor process such as etching, vacuum deposition, sputtering or the like.
As this type of liquid jet recording head, a jetting method using electrical thermal converting elements has been known as a typical jetting method, there is a method in which recording is carried out on the medium to be recorded by discharging droplets from extremely small discharge ports.
Hereinafter, one example of a conventional liquid jet recording head will be described with reference to the drawings. Generally, the liquid jet recording head is structured by having a recording unit for forming droplets and a recording liquid supplying section for supplying a recording liquid to the recording unit.
A perspective view of the exterior of the conventional liquid jet recording head is shown in
FIG. 21
, and an exploded perspective view of the conventional liquid jet recording head is shown in FIG.
22
.
As shown in FIG.
21
and
FIG. 22
, the conventional liquid jet recording head has recording element substrates
201
discharging droplets, a supporting substrate
202
supporting the recording element substrates
201
, wiring sheets
203
and a terminal wiring substrate
205
which are for supplying a recording signal to the recording element substrates
201
, and a flow path forming member
206
having a flow path for supplying the recording liquid to the recording element substrates
201
.
The recording element substrate
201
has an unillustrated electrical thermal converting element (heater) which is an energy generator, and discharge ports
201
a
provided at positions facing the electrical thermal converting element. Further, the recording element substrates
201
are joined so as to be laminated on the supporting substrate
202
formed from, for example, aluminum or ceramics.
On the supporting substrate
202
, the wiring sheets
203
, which are for transmitting electric pulse signals to the recording element substrates
201
and which are formed from TAB (Tape Automated Bonding), FPC (Flexible Printed Circuit) or the like, are adhered. The recording element substrates
201
and the wiring sheets
203
are electrically connected by wire bonding, lead bonding or the like.
Further, one end of the wiring sheet
203
is electrical connected to the terminal wiring substrate
205
for electrically connection to a drive controlling section (not shown) which the recording apparatus has. The terminal wiring substrate
205
is formed from a PWB (Printed Wiring Board), TAB, FPC or the like. A contact system connecting terminal
204
, to which the drive controlling section is electrically connected, is provided on the main surface of the wiring substrate
205
.
Although not illustrated, bosses provided at the flow path forming member
206
are inserted into holes of the terminal wiring substrate
205
, and the flow path forming member
206
and the terminal wiring substrate
205
are joined and fixed by heat-welding, an adhesive or the like.
Also, the flow path forming member
206
has recording liquid supplying paths
206
a
for supplying recording liquid to the recording element substrates
201
.
Moreover, due to the supporting substrate
202
being joined and fixed to the flow path forming member
206
, recording liquid stored in an unillustrated recording liquid tank is supplied to the recording element substrates
201
through the recording liquid supplying paths
206
a
of the flow path forming member
206
.
The liquid jet recording head described above has a structure in which the plurality of recording element substrates
201
are provided so as to be laminated on the single supporting substrate
202
. However, as another structure, there is also a liquid jet recording head in which the single recording element substrate
201
is provided so as to be laminated on the supporting substrate
202
.
As described above, when the liquid jet recording head at which the single recording element substrate
201
is mounted is loaded in a recording apparatus, there are a form in which the single liquid jet recording head is loaded and a form in which the plurality of liquid jet recording heads are loaded.
In the liquid jet recording head which is structured such that the plurality of recording element substrates
201
are laminated on the supporting substrate
202
, because the individual recording element substrates
201
are laminated by semiconductor mounting technique, the relative positions between the respective recording element substrates are precisely disposed on the supporting substrate. On the other hand, in a form in which the plurality of liquid jet recording heads, in which a single recording element substrate is laminated on the supporting substrate, are loaded in the recording apparatus, the plurality of liquid jet recording heads are individually and respectively positioned on the carriage (or a accommodating portion for the liquid jet recording heads) of the recording apparatus. Therefore, the accuracy of the relative positions between the recording element substrates is a value in which the positional accuracy of the respective recording element substrates and the positional accuracy of loading the respective liquid jet recording heads at the carriage are added.
As described above, the liquid
Koizumi Yutaka
Umeyama Mikiya
Yamaguchi Yukuo
Yamakubo Takeshi
Canon Kabushiki Kaisha
Do An H.
Fitzpatrick ,Cella, Harper & Scinto
Nguyen Judy
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