CN101274514B - Structure of color ink-jet head - Google Patents

Abstract

The invention is a kind of ink gun structure, which is used to do the ink-jet printing of the multi-color ink, it includes a chip and the heater which is set on the chip and extends along the longitudinal direction and three axes array, it is characterized in that: each of the heaters of the axial array provides ink droplets of a different color, and all of the heaters are arranged at a distance greater than one square millimeter (mm)²) The density of 25 heaters is arranged on the chip, and the length-width ratio interval of the chip is 3.6-9.0.

Description

Color inkjet head structure

technical field

The invention relates to an inkjet head structure, especially a color inkjet head structure suitable for ink cartridges.

Background technique

In addition to laser printers, inkjet printers are another widely used type of printers currently on the market. They have the advantages of low price, easy operation, and low noise, and can print on various types of paper, such as paper and photo paper. Inkjet media. The printing quality of an inkjet printer mainly depends on factors such as the design of the ink cartridge, especially the design of the inkjet head mechanism that controls the printing chip to release ink droplets to the inkjet medium is an important consideration in the design of the ink cartridge.

Generally speaking, an inkjet printer mainly uses the inkjet head to print the pattern of independent dots at a specific position of an array to combine the printed image, and the position of the independent dot is determined by the image to be printed and can be regarded as is a small point in a linear array.

The existing inkjet head structure can include a printing chip, a heater and an orifice plate, wherein the inkjet head structure is assembled on the body of an ink cartridge, and the heater is controlled by the printing chip, and the ink cartridge will provide ink to the The heater makes the heater heat the ink corresponding to the triggering of the printing chip, so that the ink stored in the ink cartridge is heated and ejected to the inkjet medium through the corresponding nozzle hole of the nozzle plate. As for the ink droplet ejection time The controls correspond to the pixels of the pattern to be printed.

Usually, the ink cartridge is set inside the inkjet printer, and is driven by a carrying system to move laterally above the inkjet medium, so that the inkjet head of the ink cartridge can move to the correct position for printing according to the pattern to be printed. Ink, that is, the carrying system causes relative motion between the inkjet head and the inkjet medium along a scanning axis, wherein the scanning axis refers to the direction parallel to the width of the inkjet medium, and a single scan of the drive assembly means that the carrying system drives The inkjet head moves once across approximately the entire width of the inkjet medium, however between individual scans the inkjet medium will advance relative to the inkjet head along a feed axis perpendicular to the scan axis, i.e. along the jet The direction of the media length.

When the inkjet head moves along the scanning axis, a line of discontinuous lines will be generated, and all the discontinuous lines are combined to form the text or image of the printed pattern. As for the printing resolution along the feed axis of the inkjet medium This is known as the density of discontinuous lines along the inkjet media feed axis, so the greater the density of discontinuous lines on the inkjet media feed axis, the higher the print resolution along that axis.

The prior art is to increase the density of the intermittent lines along the advancing axis of the inkjet medium by increasing the number of the heaters of the inkjet head, so as to improve the printing resolution and improve the printing speed, although increasing the number of the heaters of the inkjet head can To speed up the printing speed, but many heaters will generate a lot of heat to make the temperature of the inkjet head rise rapidly, which will not only affect the printing quality but may also damage the entire inkjet head.

One of the solutions developed by the industry at present is to increase the size of the inkjet head to avoid the rapid rise of the temperature of the inkjet head. However, for the highly competitive inkjet printing market, the price of inkjet printers has dropped significantly. Quickly, increasing the size of the inkjet head will increase the cost of producing inkjet printers, reducing market competitiveness.

And when the number of nozzle holes of the inkjet head is large, the inkjet head will be designed to be transmitted in sequence to save the number on the input/output (I/O) of the nozzle chip, but because the inkjet head chip needs to drive the heater. The control method still needs to combine address control and print data signals, but the design method for address control in the existing inkjet head chip is that when the number of addresses to control the heating of the inkjet head is n, the position decoder needs to be set accordingly For connecting to the corresponding inkjet drive circuit, for example, when the number of addresses for controlling the heating of the inkjet head is 20, the position decoder needs to be provided with 20 cables, but with the number of heaters The existing design will increase the area of the chip and increase the size of the inkjet head, so how to reduce the way of address control is an important issue for saving the chip area.

Therefore, how to develop a color inkjet head structure that can improve the above-mentioned deficiencies in the prior art is an urgent problem to be solved at present.

Contents of the invention

The main object of the present invention is to provide a kind of color ink-jet head structure, to solve the following problems of prior art: increase the number of the heater of ink-jet head and increase the size of ink-jet head will improve the cost of producing ink-jet printer, And the existing address control method will increase the area of the chip, and increase the size of the inkjet head, etc., and can achieve high-resolution high-speed printing, and at the same time reduce the cost because of the effective use of the space of the inkjet head, providing light and cheap components for high-performance printing.

In order to achieve the above purpose, a broad implementation of the present invention is to provide an inkjet head structure for inkjet printing of multi-color inks, which includes: a chip and a chip arranged on the chip and extending in the longitudinal direction The heaters of three axis arrays are characterized in that: each of the heaters of the axis arrays provides ink droplets of different colors, and all the heaters are arranged in the density of more than 25 heaters per square millimeter (mm ² ). On the chip, the aspect ratio of the chip ranges from 3.6 to 9.0.

The density of the heaters arranged on the inkjet head chip of the present invention exceeds 25 heaters per square millimeter (mm ² ) and includes at least 1800 orifices, and the heaters of each axis array and the corresponding orifices are arranged in at least 2 parallel rows, each row is staggered or offset relative to the adjacent row to provide a smaller effective distance than a non-staggered arrangement.

By staggering the heaters on the inkjet head, the printing cost of the inkjet head with high-density heaters can be reduced. In order to realize high-density heater arrangement on the chip, the present invention additionally includes a The number to achieve the purpose of reducing the chip area.

According to the above idea, the structure of the inkjet head further includes an address control circuit for at least receiving a serial address signal output by an inkjet control circuit, and the address control circuit includes a circuit for converting the received serial address signal into two sets of parallel address signals The output serial-to-parallel address signal converter and two address decoders that receive and decode the output signals of the serial-to-parallel address signal converter respectively, prompt the two address decoders to form M×N rows of parallel signals and send them to the AND gate And the inkjet drive circuit of the heater is used as the inkjet control signal.

The inkjet head structure of the present invention is used to realize high-resolution and high-speed printing by increasing the number of heaters and making heaters of different groups staggered so that the heaters work at high frequency.

Description of drawings

Fig. 1 is a schematic structural view of a carrier system suitable for an inkjet printer according to a preferred embodiment of the present invention.

Fig. 2(a) is a schematic structural view of a monochromatic inkjet head according to the first preferred embodiment of the present invention.

Fig. 2(b) is a schematic diagram of the structure of Fig. 2(a) after removing the orifice plate.

Fig. 3(a) is a structural schematic diagram of a color inkjet head according to a third preferred embodiment of the present invention.

Fig. 3(b) is a schematic diagram of the structure of Fig. 3(a) after removing the orifice sheet.

Fig. 3(c) is a schematic structural view of Fig. 3(a) after removing part of the orifice sheet.

Fig. 4 is a schematic diagram of the connection structure between the inkjet control circuit and the inkjet head chip of the inkjet printer.

FIG. 5( a ) is a schematic diagram of the circuit structure of the inkjet head chip shown in FIG. 4 .

FIG. 5( b ) is a schematic diagram of an enlarged circuit structure of part C of FIG. 5( a ).

Detailed ways

Some typical embodiments embodying the features and advantages of the present invention will be described in detail in the description in the following paragraphs. It should be understood that the invention is capable of various changes in different aspects without departing from the scope of the invention, and that the description and illustrations therein are illustrative in nature and not limiting. this invention.

The structure of the inkjet head of the present invention mainly arranges a large number of nozzle holes on the inkjet head in a staggered manner, so as to reduce the size of the inkjet head and provide higher printing resolution with fewer scanning and printing times, that is, The effective orifice density of the inkjet medium on the feed shaft is increased to provide a high-resolution printing speed, thereby making the inkjet head structure of the present invention applicable to relatively low-cost inkjet printers.

Please refer to Fig. 1, which is a schematic structural diagram of a carrier system suitable for an inkjet printer in a preferred embodiment of the present invention. As shown in the figure, the carrier system 1 is mainly used to support the inkjet head 111 structure of the present invention, wherein, The carrying system 1 includes a carrying frame 112 , a controller 113 , a first driving motor 116 , a position controller 117 , a second driving motor 119 , a paper feeding structure 120 and a power source 121 providing energy for the entire carrying system 1 to operate.

The carriage 112 is mainly used to accommodate the inkjet head 111 and one end thereof is connected to the first driving motor 116 to drive the inkjet head 111 to move along a straight line in the direction of the scanning axis 115. The inkjet head 111 can be replaceable Or it is permanently installed on the carrier 112 , and the controller 113 is connected to the carrier 112 for sending control signals to the inkjet head 111 .

The first driving motor 116 can be a stepping motor, but not limited thereto, and it moves the carriage 112 along the scanning axis 115 according to the control signal transmitted by the position controller 117, and the position controller 117 passes The storage 118 is used to determine the position of the carrier 112 on the scanning axis 115. In addition, the position controller 117 can also be used to control the operation of the second driving motor 119 to drive the inkjet medium 122, such as paper, between the paper feeding structure 120 , so that the inkjet medium 122 can move along the direction of the feed axis 114 .

After the inkjet medium 122 is positioned in the printing area (not shown), the first drive motor 116 will make the carriage 112 and the inkjet head 111 move along the scanning axis on the inkjet medium 122 under the drive of the position controller 117. 115 moves and prints, and after scanning one or more times on the scanning axis 115, the position controller 117 will control the operation of the second driving motor 119 to drive between the inkjet medium 122 and the paper feeding structure 120, so that the inkjet The medium 122 can move along the feed shaft 114 direction, so that another area of the inkjet medium 122 is placed in the printing area, and the first drive motor 116 will drive the carriage 112 and the inkjet head 111 on the inkjet medium 122 Move along the scan axis 115 to print another line, repeat until all the print data is printed on the inkjet medium 122, the inkjet medium 122 will be pushed out on the output carriage (not shown) of the inkjet printer, to complete the printing action.

Please refer to FIG. 2( a ), which is a schematic structural view of a monochromatic inkjet head according to a first preferred embodiment of the present invention. Wherein the inkjet head 2 shown in Fig. 2 (a) is a simplified structure schematic diagram, in the present embodiment, the inkjet head 2 is a strip structure and comprises chip 21, electrical connection sheet 22 and orifice sheet 23, wherein the chip 21 has a plurality of heaters 25 on its surface (as shown in Figure 2(b)), and the orifice sheet 23 includes a plurality of orifices 24 corresponding to the heaters 25. In this embodiment, The number of spray holes 24 can be 1000, but not limited thereto.

In this embodiment, the combined orifice resolution of the inkjet head 2 can be 1200 dots per inch (dpi), that is, the effective inkjet distance of the inkjet head 2 measured along the reference axis L is 1/1200 inches, and The reference axis L is aligned with the feed axis 114 of the inkjet media 122 shown in FIG. 1 .

In order to realize the effect of high resolution, the nozzle holes 24 on the inkjet head 2 can be arranged into two axis groups, represented by I and II in the figure, and each axis group I and II all have a centerline 26, two The centerlines 26 are arranged parallel to each other and are parallel to the reference axis L, and the nozzle holes 24 in each axis group I and II are staggered relative to the nozzle holes 24 in the other axis group I or II and the reference axis L, The axis distance of each axis I or II is P, and the effective distance of all two axis groups I and II combined relative to the reference axis L is P/2, that is, the distance between two nozzle holes 24 on the same center line 26 Be P, the vertical distance between two nozzle holes 24 adjacent to different centerlines 26 is P/2, in the present embodiment P can be 1/600 inch, P/2 is 1/1200 inch, but it does not mean that limit.

Please refer to Fig. 2 (b), which is a schematic structural view of Fig. 2 (a) after removing the orifice sheet. The ratio is preferably in the range of 9.0-12.5. In this implementation, the width Wd1 of the chip 21 is about 2.8 millimeters (mm), the length Ld1 is about 25.4 millimeters (mm), and the total area is 71.12 square millimeters (mm ² ), The aspect ratio is 9.0, so the inkjet head 2 of ^the present invention is provided with approximately nozzle hole 24 (as shown in Figure 2 (a)), and the heater 25 that is arranged on the chip 21 ejects the ink to be arranged in the nozzle hole 24 that becomes two staggered rows, and the heater 25 total length Lr1 is 5 There are 500 orifices 24 in each row of /6 inches.

Please refer to Fig. 2 (b), on the surface of the chip 21 there is a strip-shaped central ink supply channel 27 and heaters 25 which are respectively arranged on both sides of the central ink supply channel 27, in addition, the central ink supply channel One side of the channel 27 includes a first longitudinal edge 271 where the heaters 25 of the group I are arranged, and the other side includes a second longitudinal edge 272 where the heaters 25 of the second group are arranged.

In this embodiment, the width Sd1 of the central ink supply channel 27 can be 0.175 millimeters (mm), the length Ls1 can be 21.24 millimeters (mm), and the width of the central ink supply channel 27 accounts for the A-A cross-sectional area ratio of the chip 21 Yes: Sd1/Wd1=0.175mm/2.8mm=6.25%.

The heaters 25 on both sides of the central ink supply channel 27 can be arranged respectively along the first axis and the second axis to form two rows of axis groups, which are represented by I and II in the figure, and the heaters of the axis groups I and II are connected to each other. The distance between two adjacent heaters 25 in the same row is P, and the vertical distance between two adjacent heaters 25 in different rows is P/2. In this embodiment, P can be 1/600 inch, P/2 is 1/1200 inch, but not limited thereto.

至于上述计算芯片21上的加热器25密度是将中央供墨流道27的面积一起加入计算。Since the heater 25 is arranged on the highly compact inkjet head 2 chip 21, the density of the heater 25 on the chip 21 must have at least 10 heaters per square millimeter (mm ² ), so that the cost of the inkjet head 2 Lower than other inkjet heads 2 with fewer orifices 24 . In an embodiment, there may be 13.5-19.9 heaters per square millimeter (mm ² ) on the chip 21 , that is, the number of heaters is approximately in the range of 960-1415. And the preferred value is that the total number of heaters 25 is about 1000, so the density of heaters 25 per square millimeter (mm ² ) on the chip 21 of the present invention is about

As for the density of the heater 25 on the calculation chip 21, the area of the central ink supply channel 27 is added to the calculation.

Generally speaking, in order to keep the ink droplets of light weight to print at a high speed, the heater 25 needs to operate at a very high frequency. To provide high-resolution high-speed printing, the ejection frequency used by the heater 25 of the inkjet head 2 of the present invention exceeds 20 kilohertz, and the preferred frequency range is 22 to 26 kilohertz, and the present embodiment is based on 24 kilohertz. frequency operation.

Please refer to FIG. 3( a ), which is a schematic structural diagram of a color inkjet head according to a third preferred embodiment of the present invention. Wherein the ink-jet head 3 shown in Fig. 3 (a) is a simplified structure schematic diagram, in the present embodiment, the ink-jet head 3 is a strip structure and comprises chip 31, electrical connection sheet 32, orifice sheet 33 and three axis arrays 34 of heaters 35 (as shown in Figure 3(b)), and the orifice sheet 33 contains a plurality of orifices 331 corresponding to the heaters 35, mainly through a certain printing resolution. Multi-channel color printing, and the dot pitch on the axis of the inkjet medium can be less than or equal to the pitch of the nozzle holes on the axis.

Please refer to Figure 3(b) and Figure 3(c), where Figure 3(b) is a schematic diagram of the structure of Figure 3(a) after removing the orifice sheet, and Figure 3(c) is a schematic diagram of Figure 3(a) Schematic diagram of the structure after removing part of the orifice sheet, as shown in the figure, the heater 35 on the surface of the chip 31 of the inkjet head 3 of the present embodiment is arranged as an axis array 34 extending along the reference axis L, and relative to the reference axis L is isolated from each other laterally or laterally. In addition, the chip 31 also has three ink supply channels 36 parallel to the reference axis L, which are mainly used to transmit inks of different colors, and are arranged side by side relative to the vertical direction of the reference axis L. separate, and then provide inks of different colors for the heaters 35 of the corresponding three axis arrays 34, and each axis array 34 can be composed of two rows of ink heaters 35 of the same color arranged on both sides of the ink supply channel 36 and all parallel In the direction of the reference axis L, and 2 rows of heaters 35 are arranged on both sides of the ink supply channel 36 in a staggered manner, so the chip 31 of this embodiment has 2 rows×3 colors=6 rows number of heater rows.

In this embodiment, each axis array 34 can include 600 or more heaters 35, that is, each row of heaters 35 can be composed of 300 heaters 35, so the total number of heaters 35 can be 1800 , and the distance between the same row and two adjacent heaters 35 in each axis array 34 is P, and the vertical distance between two adjacent heaters 35 in different rows is P/2. In this embodiment, P can be is 1/600 inch, and P/2 is 1/1200 inch.

In some embodiments, the distance between two adjacent heaters 35 in the same row in each axial array 34 may be 1/600-1/1200 inch, and the vertical distance between two adjacent heaters 35 in different rows may be 1/1200～1/2400 inches.

The chip 31 of the inkjet head 3 of the present embodiment can be a rectangular structure, and its aspect ratio is preferably in the interval of 3.6～9.0, and the width Wd2 of the chip 31 is about 4.5 millimeters (mm), and the length Ld2 is about 16 millimeters. (mm), the total area is 72 millimeters (mm), the aspect ratio is Ld2/Wd2=16/4.5=3.6, and the density range of the heater 35 on the chip 31 is preferably 20.1～30.0, the heater of each row The total length Lr2 of 35 is about 1/2 inch, and the total number of heaters 35 is about 1800, so the density of heaters 35 per square millimeter (mm2) on the chip 31 of the present invention is about 1800/(16×4.5)=25.

In addition, the width Sd2 of each ink supply channel 36 can be 0.15 millimeters (mm), the length Ls2 can be 12.8 millimeters (mm), and the distance Cd between two adjacent ink supply channels 36 can be 1.27 millimeters (mm), Therefore, the ratio of the total width of the three ink supply channels 36 to the B-B sectional area of the chip 31 is: (Sd2/Wd2)*3=(0.15mm/4.5mm)*3=10%. In other embodiments, the distance Cd between two adjacent ink supply channels 36 may be 1.27 millimeters (mm), and the width Sd2 interval may be 0.17 mm, and the width Sd2 interval of each ink supply channel 36 may be 0.15 mm-0.17 mm. mm, and the length Ls2 of each ink supply channel 36 ranges from 12 mm to 22 mm, and the total width of the three ink supply channels 36 accounts for 10% to 11.33% of the B-B cross-sectional area of the chip 31 .

In another embodiment, the chip 31 can also have 6 rows of heater rows, but the total number of heaters can be 2000-3000, the width Wd2 of the chip 31 can be 2.5 millimeters to 3.5 millimeters (mm), and the length Ld2 can be 12.7 millimeters to 25.4 millimeters (mm), the total area is 31.75 square millimeters to 88.9 square millimeters (mm ² ), the aspect ratio is 3.6 to 10, and the density range of the heater 35 on the chip 31 is 31 to 90 Preferably, the total length Lr2 of each row of heaters 35 is about 1/2 inch, so the density of heaters 35 per square millimeter (mm ² ) on the chip 31 is about (2000/88.9) to (3000/31.75), that is, 22.4 ~94.5. As for the density of the heater 35 on the calculation chip 31, the area of the ink supply channel 37 is added to the calculation.

In addition to setting more heaters on the chip in a staggered manner to effectively use the space of the inkjet head to reduce costs and increase printing speed, the inkjet head of the present invention can also reduce the address control of the internal chips of the inkjet head. In this way, the area of the chip can be reduced, and the size of the inkjet head can be relatively reduced, thereby reducing the cost of producing the inkjet printer.

Please refer to FIG. 4 , which is a schematic diagram of the connection structure between the inkjet control circuit and the inkjet head chip of the inkjet printer. As shown in the figure, the inkjet control circuit 41 will transmit a clock signal (clock), an odd address data signal (Data_odd), an even address data signal (Data_even), and an address signal (address) when the inkjet printer (not shown) is in operation. ), a strobe signal (strobe), a heating signal (Main fire, MF) and a preheating signal (Preheat fire, PF) are sent to the end of the inkjet head chip 42 to control the operation of the entire inkjet head.

Wherein the clock signal is the basis for the control signal input to the inkjet head chip 42, the odd address data signal and the even address data signal are the print data input to the inkjet head chip 42, and the address signal is the position signal input to the inkjet head chip 42 , in order to drive the heating circuit that needs to carry out ink-jet printing, the strobe signal is the signal that controls the ink-jet head chip 42 to latch the signal that the ink-jet control circuit 41 passes in (latch), and the heating signal is to make the ink-jet head The heating circuit is a signal for printing ink droplets, and the preheating signal is a signal for preheating the inkjet head.

Please refer to Fig. 5(a) and Fig. 5(b), wherein Fig. 5(a) is a schematic diagram of the circuit structure of the inkjet head chip shown in Fig. 4, and Fig. 5(b) is part C of Fig. 5(a) Schematic diagram of the enlarged structure of the circuit, as shown in Figure 5(a), because the inkjet control circuit 41 divides the data signal into an odd address data signal and an even address data signal in order to prevent the data signal transmitted to the inkjet head chip 42 from being lost. It is sent to the inkjet head chip 42, so the internal circuit of the inkjet head chip 42 is divided into two parts to receive the odd address data signal and the even address data signal respectively and cooperate with other corresponding circuits to perform inkjet operation. The first part Part is to receive the odd address data signal (as shown in the left half of Figure 5(a)) and by the first serial parallel data signal converter (ser 2par_odd) 4211, the first serial parallel address signal converter (ser 2 par_address) 4221 , the first main address decoder (MA) 4231, the first address decoder (SA) 4241, the first buffer (Fire Buffer, FB) 4251 and the inkjet drive circuit that constitutes a plurality of group circuit blocks (Bank) Composed of 426.

As for, the second part is used to receive the even address data signal (as shown in the right half of Figure 5(a)) and is composed of the second serial-parallel data signal converter (ser 2 par_even) 4212, the second serial-parallel address Signal converter (ser 2par_address) 4222, the second main address decoder (MA) 4232, the second address decoder (SA) 4242, the second buffer (Fire Buffer, FB) 4252 and constitute a plurality of group circuit blocks (Bank) inkjet drive circuit 426, since the circuit structure of the first part and the second part are substantially similar, the difference is only in the first serial-to-parallel data signal converter 4211 and the second serial-to-parallel data signal conversion The data signals received by the device 4212 are odd addresses or even addresses, so the following will only take the first part of the description, that is, the left half of the circuit that receives the odd address data signal as an example, and will no longer discuss the even address data The right half of the signal circuit.

Please refer to FIG. 5(b) again, the first serial-to-parallel data signal converter 4211 receives the clock signal (clock), the odd address data signal (Data_odd) and the strobe signal (strobe) output by the inkjet control circuit 41, And convert the odd-numbered address data signal originally input in series into a parallel signal output with a total of 15 bits output through the od0-od14 cable, and the first serial-to-parallel address signal converter 4221 is received by the inkjet control circuit 41. Output the clock signal (clock), address signal (address) and strobe signal (strobe), and convert the address signal originally input in series into a total of 5 bits output through m0~m2 and S0~S1 cables Parallel signal output, where the signals output by m0~m2 are transmitted to the first main address decoder 4231 and decoded, and the 5-bit parallel signals are output by the cables MA0~MA4, and the signals output by the cables S0~S1 are It is sent to the first address decoder 4241 and decoded, and a 4-bit parallel signal is output through the cables SA0-SA3.

The first buffer 4251 receives the heating signal (MF) and the preheating signal (PF) output by the inkjet control circuit 41, and is mainly used to remove the noise of the heating signal and the preheating signal and strengthen the signal strength to increase the signal stability , and transmit the processed heating signal and preheating signal to the inkjet driving circuit 426 .

Each inkjet driving circuit 426 mainly includes an AND gate 4261, a potential conversion circuit, a driving transistor 4263, and a heater R. The AND gate 4261 has three pins MA_X, SA_Y, and Data_Z, and MA_X is connected to the cables MA0-MA4. One of them, SA_Y is connected to one of the cables SA0~SA3, Data_Z is connected to one of the cables od0~od14, and the AND gate 4261 will receive the output from the first main address decoder 4231 and the first address decoder 4241 The address signal and the odd address data signal transmitted by the first serial-to-parallel data signal converter 4211 perform a multiplication logic operation to output an operation result, that is, a high potential signal (high) or a low potential signal (low).

As for, the potential conversion circuit can be a boost circuit (L->H circuit) 4262, which is connected with the AND gate 4261 and the first buffer 4251 to receive the operation result output by the AND gate 4261 and the first buffer The heating signal (MF) and preheating signal (PF) output by 4251, when the operation result output by AND gate 4261 is a low potential signal, the boost circuit 4262 will choose to receive the preheating signal (PF), and will preheat The signal (PF) is converted from a low potential to a high potential signal, which is mainly used to trigger the conduction of the drive transistor 4263, and at the same time transmit a printing voltage (HV) to the heater R, so that the temperature of the heater R will increase, so that Part of the ink and the inkjet head are preheated to a specific temperature.

Conversely, when the operation result output by the AND gate 4261 is a high potential signal, the booster circuit 4262 will select to receive the heating signal (MF), and convert the heating signal from a low potential to a high potential signal, which is mainly used to trigger the driving transistor 4263 Turn on, and at the same time, a printing voltage (HV) will be sent to the heater R, so that the temperature of the heater R will rise, so as to heat the ink and generate air bubbles, so that the ink can be sprayed onto the inkjet medium.

The inkjet driving circuit 426 included in each group of circuit blocks (Bank) corresponds to only one data line, that is, one of the lines od0-od14, and the number of inkjet driving circuits 426 is equal to the address signal In the inkjet head chip 42 of the present invention, the address signal is mainly divided into a main address signal and a secondary address signal, that is, the prior art uses a single address decoder to decode the address signal, while the present invention simultaneously uses the second A main address decoder 4231 and the first address decoder 4241 to carry out, wherein the main address signal is responsible for M bits, the sub-address signal is responsible for N bits, M and N are natural numbers, prompting the first main address decoder 4231 and the second The primary address decoder 4241 forms M×N rows of parallel signals and sends them to the inkjet drive circuit 426 with the AND gate 4261 and the heater R as inkjet control signals.

In this embodiment, the main address signal is responsible for 5 bits, that is, M=5, and the secondary address signal is responsible for 4 bits, that is, N=4. The main address signal is the output of the first main address decoder 4231 through the cables MA0-MA4 The 5-bit parallel signal, the sub-address signal is the 4-bit parallel signal output by the first address decoder 4241 through the cables SA0~SA3, the main address signal and the sub-address signal will be multiplied by the AND gate 4261 to generate the original The total number of addresses is the same, that is, M × N = 5 × 4 = 20, which can solve the problem of increasing the size of the chip layout (layout) by setting 20 lines in the prior art, and then reduce the number of inkjet head chips occupied by the lines. In order to reduce the area of the chip, the size of the inkjet head is relatively reduced, thereby reducing the cost of producing the inkjet printer.

Please refer to the following table 1, which is the parallel address signal input to the first main address decoder 4231 by the m0-m2 cable, and the parallel address signal input to the first address decoder 4241 by the S0-S1 cable. The correspondence table corresponding to 20 addresses:

corresponding address m0～m2 S0～S1 1 000 00 2 000 01 3 000 10 4 000 11 5 001 00 6 001 01 7 001 10 8 001 11 9 010 00 10 010 01 11 010 10 12 010 11 13 011 00 14 011 01 15 011 10 16 011 11 17 100 00 18 100 01 19 100 10 20 100 11

Table I

Of course, the number of cables output by the first main address decoder 4231 and the first address decoder 4241 is not limited to M=5 and N=4, and can be adjusted as required. For example, when controlling the number of addresses When it is 16, the number of lines of the first main address decoder 4231 can be M=4, while the first address decoder 4241 also maintains N=4, and after the two are multiplied, M×N=4×4=16 .

To sum up, the color inkjet head structure of the present invention mainly arranges more heaters on the chip in a staggered manner to effectively use the space of the inkjet head to reduce the cost and increase the printing speed. Decoder and sub-address decoder to replace the existing single address decoder, reduce the layout and wiring area of the chip inside the inkjet head to reduce the chip area, so that the size of the inkjet head is relatively reduced, thereby reducing the cost of producing inkjet printers . Therefore, the color inkjet head structure of the present invention has great industrial value.

Claims (10)

1. ink gun structure, in order to carrying out the inkjet printing of multi-color ink, it comprises a chip and is arranged on this chip and the heater of three axis arrays extending longitudinally, it is characterized in that:

The heater of each this axis array provides respectively the ink droplet of different colours, and all heater is to be arranged on this chip with the density greater than every square millimeter of 25 heaters, and the length-width ratio interval of this chip is 4.0～9.0;

This ink gun structure also includes an address control circuit that receives at least a string column address signal that an ink-jet controlling circuit exports, this address control circuit includes one and converts the tandem address signal that receives to the string of two groups of address signals outputs arranged side by side and address signal converter and two and receive respectively the output signal of this string and address signal converter and the address decoder of being decoded, impel these two address decoders form M * N row signal arranged side by side be delivered to have one with and the ink-jet driving circuit of a heater in as the ink-jet control signal.

2. ink gun structure according to claim 1, the heater that it is characterized in that each this axis array are along being parallel to each other and spaced axis is arranged at least 2 axis groups.

3. ink gun structure according to claim 2 is characterized in that these a plurality of heater overall lengths that each this axis group comprises are 1/2 inch.

4. ink gun structure according to claim 2 is characterized in that this ink gun structure also comprises three ink supply runners that are set up in parallel, and it is arranged at respectively between these 2 axis groups of heater of each this axis array at least.

5. ink gun structure according to claim 4, the width of flow path that it is characterized in that each this ink supply runner is 0.15 millimeter, flow channel length is 12.8 millimeters.

6. ink gun structure according to claim 4 is characterized in that the runner spacing between these 3 ink supply runners is 1.27 millimeters.

7. ink gun structure according to claim 1, the length-width ratio that it is characterized in that this chip is 4.0.

8. ink gun structure according to claim 1 is characterized in that being provided with on this chip 1800 heaters.

9. ink gun structure according to claim 1, it is characterized in that arranging on this chip between the density region of this heater is every square millimeter of 25 to 30.0 heaters.

10. ink gun structure according to claim 1, the spacing that it is characterized in that adjacent two heaters is 1/600 inch.

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