Incremental printing of symbolic information – Ink jet – Controller
Reexamination Certificate
1999-01-11
2001-08-14
Nguyen, Thinh (Department: 2861)
Incremental printing of symbolic information
Ink jet
Controller
C358S001900
Reexamination Certificate
active
06273540
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates to a driving device of a printer head which receives serial print data of maximum n bits tone, and selects a conductive waveform depending upon the received print data for printing.
For example, in Jpn. Pat. Appln. KOKAI Publication No. 8-216457, as shown in
FIG. 23
, print data with respect to each nozzle of print head
2
from a CPU
1
is converted through a tone serial data converting section
3
into serial print data including tone information, and the converted data is supplied to a tone parallel data converting section
4
. The tone parallel data converting section
4
converts the serial print data into tone parallel data corresponding to the number of tones of nozzle, and the converted tone parallel data is supplied to a driver
6
through a duty control section
5
, and a print head
2
is driven by this driver
6
.
In Jpn. Pat. Appln. KOKAI Publication No. 9-11457, as shown in
FIG. 24
, there are provided common waveform generating means
7
for generating a plurality of driving voltage waveforms corresponding to sizes of dots, and system control means
8
for generating print data, shift clock and the like. Two-bits tone data which is print data is supplied from the system control means
8
to a shift circuit
9
and is stored therein, and the tone data stored in the shift circuit
9
is latched by a latch circuit
10
at a predetermined timing, the latched output is converted by a decoder
11
and then, a multiplexer
13
is driven through signal processing means
12
to select one driving voltage waveform from the common waveform generating means
7
to drive a piezoelectric element.
In Jpn. Pat. Appln. KOKAI Publication No. 6-15846, as shown in
FIG. 25
, two bits parallel data S
11
and S
12
are supplied to shift registers
14
and
15
, respectively, data in each bit is latched by a latch circuit
16
from the shift registers, and the latched output is supplied to a parallel/serial conversion circuit
17
. On the other hand, an output of an interval timer
19
of a print command pulse processing section
18
is supplied to the parallel/serial conversion circuit
17
, and is supplied to a flip-flop
21
through an AND gate
20
. An output of this flip-flop and an output of an output protection circuit which monitors a power supply voltage are supplied to an AND gate
23
, an output of this AND gate
23
and an output of the parallel/serial conversion circuit
17
are supplied to an AND gate
24
, and an output of this AND gate
24
drives a transistor Tr to turn on the electricity for an exothermic resistor R.
In the case of Jpn. Pat. Appln. KOKAI Publication No. 8-216457, when data having two values is handled for example, since it is necessary to add dummy data such that the amount of bits becomes the same as the number of tones, and to transfer the same, there is a problem that it takes a time for transferring the data. In the case of Jpn. Pat. Appln. KOKAI Publication No. 9-11457, when data having two values is handled for example, since it is also necessary to add dummy data such that the amount of bits becomes the same as the number of shifts of the shift circuit, and to transfer the same, there is a problem that it takes a time for transferring the data. Further, in the case of Jpn. Pat. Appln. KOKAI Publication No. 6-15846, there are provided shift registers in two parallel steps, data is transferred as two bits parallel data and therefore, there is a problem that the number of signal lines is increased.
BRIEF SUMMARY OF THE INVENTION
It is an object of the present invention to provide a driving device of printer head in which data can be transferred in series and thus, one signal line suffices for transferring data, and even when data of two values is handled, it is unnecessary to add and transfer dummy data, and data transferring time can be shortened more as the amount of bits of print data is smaller so that data can be printed more swiftly.
The present invention described in claim
1
is that a driving device of a printer head which receives one bit serial print data of maximum n bits tone per one pixel and which determines a driving waveform for driving a printer head in accordance with the received print data, comprising:
serial input shift register means for shifting the received one bit serial print data; and
changing means for changing a shift path of the shift register means in accordance with the number m (1≦m≦n) of bits of tone to be received.
According to the invention described in claim
1
, data can be transferred in series and thus, one signal line suffices for transferring data, and even when data of two values is handled, it is unnecessary to add and transfer dummy data, and data transferring time can be shortened more as the amount of bits of print data is smaller so that data can be printed more swiftly.
Additional objects and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objects and advantages of the invention may be realized and obtained by means of the instrumentalities and combinations particularly pointed out hereinafter.
REFERENCES:
patent: 5149212 (1992-09-01), Murakami
patent: 5894242 (1999-04-01), Fujimoto
patent: 6046822 (2000-04-01), Wen et al.
patent: 6102513 (2000-08-01), Wen et al.
patent: 0 367 550 (1990-05-01), None
patent: 0 655 340 (1995-05-01), None
patent: 0 779 151 A (1997-06-01), None
patent: 6-015846 A (1994-01-01), None
patent: 8-216457 A (1996-08-01), None
patent: 9-011457 A (1997-01-01), None
patent: 09-109389 (1997-04-01), None
Patent Abstracts of Japan, vol. 017, No. 041 (M-1359), Jan. 26, 1993 and JP 04-259572 (Nec Corp.), Sep. 16, 1992—Abstract.
Nitta Noboru
Ono Shunichi
Takamura Jun
Frishauf, Holtz Goodman, Langer & Chick, P.C.
Nguyen Thinh
Toshiba Tec Kabushiki Kaisha
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