Inkjet printhead cartridge and scanning inkjet printer

Abstract

The present application relates to an inkjet printhead cartridge and a scanning inkjet printer. The inkjet printhead cartridge is suitable for use in the scanning inkjet printer. The inkjet printhead cartridge comprises: a molded ink manifold having a first ink reservoir, a second ink reservoir, a third ink reservoir, and a fourth ink reservoir, the first, second, third, and fourth ink reservoirs having respective tapered channels for supplying respective first, second, third, and fourth inks to respective first, second, third, and fourth ink delivery slots defined in a base of the ink manifold; and a first print die and a second print die mounted to the base of the ink manifold, the first and second print dies having respective nozzles aligned with each other along a scanning direction of the inkjet printhead cartridge for drop-on-demand printing.

Description

Technical Field

[0001] This utility model relates to an inkjet printhead cartridge. It was primarily developed for high-quality, high-speed printing of multiple colors (e.g., CMYK) using a scanning printer. Background Technology

[0002] The applicant has developed a series of full-page (page-wide) printheads for single-pass printing applications. A full-page printhead uses multiple print chips mated together in a row to form an A4 or A3 printhead. Therefore, This printer offers significantly higher printing speeds than conventional inkjet scanners, where the printhead cassette moves laterally back and forth across the medium during swathe printing.

[0003] Conventional scanning inkjet printers are ubiquitous in home and office applications, where the lower upfront cost is often preferable to high-speed printing. Scanning printheads have been commercially available for decades and dominate the consumer inkjet market. Scanning inkjet printheads typically have a single or two print chips, as is well known to those skilled in the art.

[0004] The primary factor in the cost of a scanning printhead is the cost of the silicon print chip. Generally, the larger the area of ​​silicon, the higher the cost of the printhead. Furthermore, there is a desire to reduce manufacturing costs by avoiding complex micro-molding components used to deliver ink to the print chip. Therefore, scanning printheads typically have a minimal number of molded components used to supply ink directly to the back-side ink channels of the print chip. Utilizing low-cost molded components and a single print chip typically on each cartridge (e.g., K or CMY print chips only), scanning inkjet printhead cartridges can be manufactured as user-replaceable consumable parts, whereby the user replaces the print chip each time they purchase more ink. Alternatively, in high-end scanning inkjet printers, the printhead cartridge may be non-replaceable (or rarely replaced), while the ink cartridges are replaced separately.

[0005] The printed chip has up to five color channels, and five color channels occupy the smallest possible silicon area. As described in US7,407,262 (the contents of which are incorporated herein by reference), The inkjet nozzle assembly in the printhead is arranged in pairs of staggered sub-rows, with ink supplied from the back ink supply channel. Therefore, each pair of sub-rows defines one color channel in the printhead. The staggered sub-rows are configured to print odd and even dots on the same print line, enabling high dpi printing.

[0006] low cost Print chips are suitable not only for full-page printheads but also for scanning inkjet printers. However, delivering inks of multiple colors to the back-side ink channels within the print chip (e.g., ink channels 50 to 150 micrometers or 60 to 100 micrometers wide) presents a potential problem. Micromolded LCP manifolds (such as those described in US7407262) increase the cost and complexity of the printhead, which is undesirable in low-cost scanning printhead cartridges.

[0007] U.S. Provisional Application No. 63 / 610,533, filed on December 15, 2023, entitled “Low-Cost Inkjet Printhead” (the contents of which are incorporated herein by reference), describes a low-cost single-chip printhead comprising an ink manifold and a print chip incorporated into the manifold. This printhead eliminates the need for micromolded components for delivering ink to the print chip while still being able to print in full color (CMYK). Utility Model Content

[0008] The goal is to provide a printhead cassette suitable for scanning inkjet printers that similarly avoids the use of micro-molded parts while enabling high-speed, high-quality, full-color (CMYK) printing.

[0009] According to this disclosure, printhead boxes, printers, and / or methods are provided.

[0010] This disclosure includes, but is not limited to, the following provisions.

[0011] Clause 1. An inkjet printhead cartridge suitable for a scanning inkjet printer, the inkjet printhead cartridge comprising:

[0012] A molded ink manifold, the ink manifold including a first ink reservoir, a second ink reservoir, a third ink reservoir and a fourth ink reservoir, the first ink reservoir, the second ink reservoir, the third ink reservoir and the fourth ink reservoir having corresponding tapered channels for supplying corresponding first ink, second ink, third ink and fourth ink to corresponding first ink delivery slot, second ink delivery slot, third ink delivery slot and fourth ink delivery slot defined in the base of the ink manifold;

[0013] The inkjet print head cartridge contains only one first print chip and one second print chip, which are mounted to the base of the ink manifold. The first and second print chips have corresponding nozzles aligned with each other along the scanning direction of the print head cartridge for point-to-point printing.

[0014] in:

[0015] The first ink delivery slot interconnects the first ink reservoir with the first pair of redundant nozzle rows in the first printing chip;

[0016] The second ink delivery slot interconnects the second ink reservoir with the second pair of redundant nozzle rows in the first print chip;

[0017] The third ink delivery slot interconnects the third ink reservoir with the third pair of redundant nozzle rows in the second printing chip; and

[0018] The fourth ink delivery slot interconnects the fourth ink reservoir with the fourth pair of redundant nozzle rows in the second printing chip.

[0019] Clause 2. The inkjet printhead cartridge as described in Clause 1, wherein the first ink is black, the second ink is magenta, the third ink is cyan, and the fourth ink is yellow.

[0020] Clause 3. The inkjet printhead cassette as described in Clause 1, wherein each nozzle row includes an offset sub-row for nozzle arrangements for printing odd and even dots.

[0021] Clause 4. The inkjet printhead cassette as described in Clause 1, wherein:

[0022] A pair of first back-side ink channels in the first printing chip receive the first ink from the first ink delivery slot and supply the first ink to the first pair of redundant nozzle rows in the first printing chip;

[0023] A pair of second back-side ink channels in the first printing chip receive the second ink from the second ink delivery slot and supply the second ink to the second pair of redundant nozzle rows in the first printing chip;

[0024] A pair of third back-side ink channels in the second printing chip receive the third ink from the third ink delivery slot and supply the third ink to the third pair of redundant nozzle rows in the second printing chip; and

[0025] A pair of fourth back-side ink channels in the second printing chip receive the fourth ink from the fourth ink delivery slot and supply the fourth ink to the fourth pair of redundant nozzle rows in the second printing chip.

[0026] Clause 5. The inkjet printhead cartridge according to Clause 4, wherein the first partition wall of the ink manifold fluidly isolates the first ink reservoir from the second ink reservoir, and the second partition wall of the ink manifold fluidly isolates the third ink reservoir from the fourth ink reservoir, and wherein:

[0027] The base portion of the first partition wall is adhesively bonded to the back side of the first printed chip in the longitudinal bonding area between the pair of first back-side ink channels and the pair of second back-side ink channels; and

[0028] The base portion of the second partition wall is adhesively bonded to the back side of the second printed chip in the longitudinal bonding area between the pair of third back-side ink channels and the pair of fourth back-side ink channels.

[0029] Clause 6. The inkjet printhead cartridge as described in Clause 1, wherein the first print chip and the second print chip are identical to each other.

[0030] Clause 7. The inkjet printhead cartridge according to Clause 6, wherein the first print chip and the second print chip are mounted to the base of the ink manifold in opposite orientations, the second print chip being rotated 180 degrees relative to the first print chip.

[0031] Clause 8. The inkjet printhead cassette according to Clause 7, wherein each of the first print chip and the second print chip has a main nozzle area and a horizontally offset nozzle area at one end thereof, the horizontally offset nozzle area being configured to dock the first print chip and the second print chip together in a row.

[0032] Clause 9. The inkjet printhead cassette according to Clause 8, wherein the first print chip and the second print chip are partially offset along the scanning direction in order to maximize alignment of the respective main nozzle areas in the scanning direction.

[0033] Clause 10. The inkjet printhead cartridge according to Clause 8, wherein the combined printing area of ​​the first print chip and the second print chip is rectangular or elongated, and each of the first print chip and the second print chip has unused nozzles at both ends.

[0034] Clause 11. The inkjet printhead cartridge according to Clause 7, wherein the first print chip and the second print chip each have a row of bonding pads extending along one of their longitudinal edges, and wherein, due to the second print chip being rotated 180 degrees relative to the first print chip, the first row of bonding pads of the first print chip is distally opposite to the second row of bonding pads of the second print chip.

[0035] Clause 12. The inkjet printhead cartridge according to Clause 11, wherein the flexible connector extends from the end face of the ink manifold to the base of the ink manifold around the outer surface of the ink manifold.

[0036] Clause 13. The inkjet printhead cartridge according to Clause 12, wherein the flexible connector has a first chip slot and a second chip slot defined in the flexible connector, the first print chip and the second print chip being received in the first chip slot and the second chip slot.

[0037] Clause 14. The inkjet printhead cartridge according to Clause 13, wherein the flexible connector is electrically connected to the first row bonding pad and the second row bonding pad.

[0038] Clause 15. The inkjet printhead cartridge according to Clause 14, wherein the flexible connector includes electrical contacts at the end face for connection to complementary contacts of the printhead carriage.

[0039] Clause 16. The inkjet printhead cartridge according to Clause 1, wherein each of the first ink reservoir, the second ink reservoir, the third ink reservoir, and the fourth ink reservoir comprises at least one of the following:

[0040] A foam insert for providing back pressure for supplying ink to the corresponding print chip; and

[0041] A filter is located upstream of each ink delivery tank.

[0042] Clause 17. A scanning inkjet printer, comprising:

[0043] bracket;

[0044] The inkjet printhead cartridge as described in Clause 1 is mounted on the bracket;

[0045] A lateral movement mechanism, wherein the lateral movement mechanism is used to reciprocate laterally on the page; and

[0046] A media supply mechanism for advancing media relative to the inkjet printhead cartridge after each lateral movement of the carriage.

[0047] Clause 18. A method of printing using a printhead cartridge according to Clause 1, the method comprising the steps of:

[0048] The printhead box is moved laterally on the page along a first direction, and the first pair of redundant nozzle rows, the second pair of redundant nozzle rows, the third pair of redundant nozzle rows and the fourth pair of redundant nozzle rows are used to print the first ink, the second ink, the third ink and the fourth ink in a first order;

[0049] Advance the page relative to the printhead cassette; and

[0050] The printhead box is moved laterally on the page in a second direction opposite to the first direction, and the first ink, the second ink, the third ink, and the fourth ink are printed in a reverse second order using the first pair of redundant nozzle rows, the second pair of redundant nozzle rows, the third pair of redundant nozzle rows, and the fourth pair of redundant nozzle rows.

[0051] As used herein, the term "ink" refers to any printing fluid that can be printed from an inkjet printhead. Ink may or may not contain colorants. Therefore, the term "ink" can include conventional dye-based or pigment-based inks, infrared inks, fixatives (such as pre-coatings and finishing agents), 3D printing fluids, biofluids, and the like.

[0052] As used herein, the term "installation" includes both direct installation and indirect installation via intermediate components. Attached Figure Description

[0053] Embodiments will now be described by way of example only with reference to the accompanying drawings, in which:

[0054] Figure 1 This is a bottom perspective view of the printhead box;

[0055] Figure 2 This is a top view of the printhead box with the cover removed;

[0056] Figure 3 This is a bottom perspective view of the ink manifold;

[0057] Figure 4 This is a cross-sectional perspective view of the printhead box;

[0058] Figure 5 This is an enlarged cross-sectional perspective view of the chip mounting area;

[0059] Figure 6 This is an enlarged bottom perspective view of the printhead box;

[0060] Figure 7 This is a plan view of the back side of a printed chip;

[0061] Figure 8 This is a magnified plan view of the back side of one end of the printed chip;

[0062] Figure 9 The printing area of ​​a pair of printing chips in the printhead box is shown;

[0063] Figure 10 This is an enlarged view of the front nozzle row of a printed chip; and

[0064] Figure 11 This is a schematic diagram of a scanning inkjet printer. Detailed Implementation

[0065] As stated in US2018 / 0222198 (the contents of which are incorporated herein by reference), only two colors of ink are provided. Print chip 1 has been used in the full-page printhead and in Memjet's... and DuraBolt TMCommercialization of the technology. These printed chips 1 have five rows of nozzles containing inkjet nozzle assemblies (see, for example, ...). Figure 10 Each nozzle row has a pair of staggered sub-rows for printing odd and even dots. However, the middle nozzle row 5 is a non-jetting row because it lacks a corresponding back-side ink channel for supplying ink to it (see [link to documentation]). Figure 7 and Figure 8 Instead of supplying ink to each of the five nozzle rows, only two pairs of nozzle rows 7 and 9 eject droplets and are supplied with ink via corresponding pairs of back-side ink channels 11 and 13. One pair of back-side ink channels 11 receives one ink color from the ink manifold, and the other pair of ink channels 13 receives a different ink color from the ink manifold. In this way, double redundancy is achieved for each color via the pairs of redundant nozzle rows 7 and 9. The basic principle of using only four of the five available nozzle rows is to allow space on the back side of each print chip 1 for (via a gasket, as described in US2018 / 0222198) bonding to the ink manifold. In the absence of a central back-side ink channel (or only a shallow adhesive receiving groove), each print chip 1 has a central back-side bonding area 15 available for adhesive bonding, as shown in [example missing]. Figure 7 and Figure 8 As shown. The outer bonding area 17, located on the opposite sides of the back ink channels 11 and 13, can also be used for adhesive bonding. This arrangement has the following advantages: simpler ink channels from the manifold to the back of each printed chip, improved color separation between nozzle rows, improved bubble management, and improved manufacturing tolerances.

[0066] For completeness, the nozzle arrangements included in nozzle rows 7 and 9 are generally of the type described in US 9,044,945 (the contents of which are incorporated herein by reference). Thus, each nozzle arrangement includes: a chamber having peripheral sidewalls extending continuously around the chamber; a nozzle opening defined in the top of said chamber; an actuator disposed in the chamber for ejecting ink droplets through the nozzle opening; and an inlet defined in the base plate of the chamber. Such nozzle arrangements advantageously have minimal crosstalk and receive ink only via a corresponding chamber inlet defined in its base plate, which intersects with the back-side ink channel. For the description of fluid-isolated nozzle arrangements arranged in offset (“odd” and “even”) sub-rows, each sub-row has a corresponding chamber inlet intersecting with the back-side ink channel, refer to Figure 21B of US 7,441,865, the contents of which are incorporated herein by reference.

[0067] For the design of a color printhead cassette for a scanning inkjet printer, it is desirable to supply four ink colors (CMYK) to the print chip 1 for full-color printing. To date, the applicant has used micromolds and spacers to guide the four ink colors into the back of the print chip (see, for example, WO2005 / 070677). However, the cost and complexity of micromolds are generally unsuitable for low-cost scanning printhead cassettes.

[0068] refer to Figures 1 to 6 This illustrates a printhead cassette 50 suitable for scanning printing applications, which addresses some of the aforementioned problems. The printhead cassette 50 includes a first print chip 1A and a second print chip 1B directly adhesively bonded to the base 51 of an ink manifold 52. Each print chip 1A and 1B receives power and data via a flexible connector 54, which bends from its end wall around the curved outer surface of the ink manifold 52 to cover the base 51 of the ink manifold 52. The flexible connector 54 has a contact pad 56 at one end of the printhead cassette 50 for contact with a printer carriage (…). Figure 1 Complementary contacts (not shown) engage. Flexible connector 54 defines a pair of chip slots 55A and 55B in which corresponding printed chips 1A and 1B are received and mounted to the base of manifold 52. A polymer encapsulant (not shown) protects the wire bonding connection (not shown) between flexible connector 54 and printed chips 1A and 1B between the two chips, as is known in the art. Advantageously, a single flexible connector 54 provides power and data to both printed chips 1A and 1B from a multi-row contact pad 56.

[0069] refer to Figure 6 The first printed chip 1A and the second printed chip 1B are identical, and the second chip 1B is oriented opposite to the first printed chip; that is, the second printed chip 1B is rotated 180 degrees relative to the first printed chip. Therefore, the first row of bonding pads 58A extending along one longitudinal edge of the first printed chip 1A is distally opposite to the second row of bonding pads 58B extending along the opposite longitudinal edge of the second printed chip 1B. Thus, wire bonding can be easily connected between the first row of bonding pads 58A and the flexible connector 54; and similarly, wire bonding can be easily connected between the second row of bonding pads 58B and the flexible connector 54.

[0070] As mentioned above, Printing chip 1 has a front side comprising five rows of nozzles, each row having a pair of offset sub-rows for printing odd and even dots. The central nozzle row 5 is a non-ejection row; therefore, due to the absence of a back ink channel, no ink is supplied to the nozzles contained within the central row (see [link to relevant documentation]). Figure 7 and Figure 8 ). refer to Figure 9 It should be understood that each The printed chips are uniquely configured to be mated together by means of a main nozzle area 20 and a nozzle area 22 that is horizontally offset (“dropped”) at one end of the chip in a full-page arrangement.

[0071] To simplify the data processing requirements of the printhead cassette 50, the first print chip 1A and the second print chip 1B only use aligned nozzles from their respective main nozzle areas 20. Therefore, the combined printing area 25 of the first print chip 1A and the second print chip 1B (composed of...) Figure 9 The area shown in the dashed box is typically rectangular (elongated), with unused nozzles 27 located at opposite ends of each print chip outside the printing area. In contrast to a full-page printhead arrangement, and to maximize the available aligned nozzles from the respective main nozzle areas 20 for point-to-point printing, print chips 1A and 1B are positioned along the reciprocating scanning direction S (as shown in the dashed box). Figure 9 (As shown by the double-headed arrow in the image) partially offset. Thus, the same... Print chip 1 can be used in scanning applications and full-page printhead applications without any modifications.

[0072] Return to Figures 1 to 5 The ink manifold 52 is a relatively simple, one-piece molded structure that can be made of any suitable polymer and defines four ink reservoirs 60A to 60D for each of four ink types (e.g., 60A = yellow; 60B = cyan, 60C = magenta, 60D = black). The ink reservoirs 60A to 60D are positioned adjacent to each other across the width of the ink manifold 52 to maximize the available ink volume. Although Figure 2 The ink reservoirs shown have relatively equal volumes, but it should be understood that the corresponding volumes can be easily modified to correspond to the intended ink usage. For example, the ink reservoir 60D for black ink can be made relatively larger than the ink reservoirs 60A to 60C for color ink.

[0073] Ink reservoirs 60A to 60D each supply ink via a corresponding tapered channel 62 to a corresponding ink delivery slot 64A to 64D defined in the base 51 of the ink manifold 52. Then, four ink colors (YCMK) are supplied to corresponding back-side ink channels 11 and 13 in the first print chip 1A and the second print chip 1B for redundant printing of each color via corresponding pairs of redundant nozzles 7 and 9 in each print chip. Therefore, each print chip prints two ink colors, such as... Figure 9 As shown. By way of example only, the first printing chip 1A can print black and magenta inks via its pair of redundant nozzle rows 7 and 9, and the second printing chip 1B can print cyan and yellow inks via its pair of redundant nozzle rows 7 and 9.

[0074] Each ink reservoir 60A to 60D may be provided with a foam insert (not shown) for regulating the back pressure of the ink delivered to the print chips 1A and 1B, as is known in the art. Additionally, a filter (not shown) may be provided upstream of the ink delivery reservoirs 64A to 64D.

[0075] like Figure 4 and Figure 5 As shown, a first partition wall 67A separating the first ink reservoir 60A and the second ink reservoir 60B terminates at its lower end at a first base portion 69A between the first ink delivery channel 64A and the second ink delivery channel 64B. A central back-side bonding area 15 of the first print chip 1A is adhesively bonded to the first base portion 69A, while an outer back-side bonding area 17 of the first print chip is adhesively bonded to the base portion of the manifold 52 surrounding the periphery of the first ink delivery channel 64A and the second ink delivery channel 64B. Similarly, a second partition wall 67B separating the third ink reservoir 60C and the fourth ink reservoir 60D terminates at its lower end at a second base portion 69B between the third ink delivery channel 64C and the fourth ink delivery channel 64D. A central back-side bonding area 15 of the second print chip 1B is adhesively bonded to the second base portion 69B, while an outer back-side bonding area 17 of the second print chip is adhesively bonded to the base portion of the manifold 52 surrounding the periphery of the third ink delivery channel 64C and the fourth ink delivery channel 64D. Therefore, the first printing chip 1A and the second printing chip 1B can be effectively mounted to the base 51 of the ink manifold 52, providing excellent fluid sealing and eliminating the need for an intermediate gasket, as used in the full-page arrangement described in US2018 / 0222198. However, it should be understood that in alternative embodiments, the first printing chip 1A and the second printing chip 1B can be mounted via a corresponding intermediate gasket, chip attachment film, etc.

[0076] This simple structure and ink channel arrangement enables a high-quality dual-chip printhead cartridge 50 suitable for scanning printers. The printhead cartridge 50 can be refilled with ink from replaceable cartridges, eliminating the need for the user to replace the printhead cartridge whenever ink needs to be replenished. Optionally, and depending on economic factors, the printhead cartridge 50 can be disposable, thus requiring the replacement of the entire printhead cartridge, including the ink, whenever ink needs to be replenished.

[0077] In use, now for reference Figure 11 The scanning inkjet printer 100 includes a printhead box 50 mounted on a lateral moving carriage 102, which is reciprocated laterally by a lateral moving mechanism T to perform strip printing on a page 104. After each strip printing operation, the page 104 is gradually advanced by a page advancing mechanism A. This type of scanning printer is well known to those skilled in the art.

[0078] Typically, printer 100 prints in all four colors in both scanning directions of the carriage to maximize printing speed. As described, for example, in EP1291192 (attributed to the Hewlett-Packard Company), any tonal variations caused by the inversion of color laydown in bidirectional printing can be compensated for by using different color maps of the image in the forward and reverse scanning directions of carriage 102.

[0079] Of course, it should be understood that the present invention has been described by way of example only, and that detailed modifications may be made within the scope of the present invention, the scope of which is defined in the appended claims.

Claims

1. An inkjet printhead cartridge, the inkjet printhead cartridge being suitable for a scanning inkjet printer, characterized in that, The inkjet printhead cartridge includes: A molded ink manifold, the ink manifold including a first ink reservoir, a second ink reservoir, a third ink reservoir and a fourth ink reservoir, the first ink reservoir, the second ink reservoir, the third ink reservoir and the fourth ink reservoir having corresponding tapered channels for supplying corresponding first ink, second ink, third ink and fourth ink to corresponding first ink delivery slot, second ink delivery slot, third ink delivery slot and fourth ink delivery slot defined in the base of the ink manifold; The inkjet print head cartridge contains only one first print chip and one second print chip, which are mounted to the base of the ink manifold. The first and second print chips have corresponding nozzles aligned with each other along the scanning direction of the print head cartridge for point-to-point printing. in: The first ink delivery slot interconnects the first ink reservoir with the first pair of redundant nozzle rows in the first printing chip; The second ink delivery slot interconnects the second ink reservoir with the second pair of redundant nozzle rows in the first print chip; The third ink delivery slot interconnects the third ink reservoir with the third pair of redundant nozzle rows in the second printing chip; and The fourth ink delivery slot interconnects the fourth ink reservoir with the fourth pair of redundant nozzle rows in the second printing chip.

2. The inkjet printhead cartridge according to claim 1, characterized in that, The first ink is black, the second ink is magenta, the third ink is cyan, and the fourth ink is yellow.

3. The inkjet printhead cartridge according to claim 1, characterized in that, Each nozzle row includes an offset sub-row for the nozzle assembly used to print odd and even points.

4. The inkjet printhead cartridge according to claim 1, characterized in that: A pair of first back-side ink channels in the first printing chip receive the first ink from the first ink delivery slot and supply the first ink to the first pair of redundant nozzle rows in the first printing chip; A pair of second back-side ink channels in the first printing chip receive the second ink from the second ink delivery slot and supply the second ink to the second pair of redundant nozzle rows in the first printing chip; A pair of third back-side ink channels in the second printing chip receive the third ink from the third ink delivery slot and supply the third ink to the third pair of redundant nozzle rows in the second printing chip; and A pair of fourth back-side ink channels in the second printing chip receive the fourth ink from the fourth ink delivery slot and supply the fourth ink to the fourth pair of redundant nozzle rows in the second printing chip.

5. The inkjet printhead cartridge according to claim 4, characterized in that, The first partition wall of the ink manifold fluidly isolates the first ink reservoir from the second ink reservoir, and the second partition wall of the ink manifold fluidly isolates the third ink reservoir from the fourth ink reservoir, wherein: The base portion of the first partition wall is adhesively bonded to the back side of the first printed chip in the longitudinal bonding area between the pair of first back-side ink channels and the pair of second back-side ink channels; and The base portion of the second partition wall is adhesively bonded to the back side of the second printed chip in the longitudinal bonding area between the pair of third back-side ink channels and the pair of fourth back-side ink channels.

6. The inkjet printhead cartridge according to claim 1, characterized in that, The first printing chip and the second printing chip are identical to each other.

7. The inkjet printhead cartridge according to claim 6, characterized in that, The first printing chip and the second printing chip are mounted to the base of the ink manifold with opposite orientations, and the second printing chip is rotated 180 degrees relative to the first printing chip.

8. The inkjet printhead cartridge according to claim 7, characterized in that, Each of the first and second printing chips has a main nozzle area and a horizontal offset nozzle area at one end thereof, the horizontal offset nozzle area being configured to mate the first and second printing chips together in a row.

9. The inkjet printhead cartridge according to claim 8, characterized in that, The first and second printing chips are partially offset along the scanning direction to maximize alignment of their respective main nozzle areas along the scanning direction.

10. The inkjet printhead cassette according to claim 8, characterized in that, The combined printing area of ​​the first and second printing chips is rectangular or elongated, and each of the first and second printing chips has unused nozzles at both ends.

11. The inkjet printhead cartridge according to claim 7, characterized in that, The first printing chip and the second printing chip each have a row of bonding pads extending along one of their longitudinal edges, and wherein, since the second printing chip is rotated 180 degrees relative to the first printing chip, the first row of bonding pads of the first printing chip is distally opposite to the second row of bonding pads of the second printing chip.

12. The inkjet printhead cartridge according to claim 11, characterized in that, The flexible connector extends from the end face of the ink manifold to the base of the ink manifold around the outer surface of the ink manifold.

13. The inkjet printhead cartridge according to claim 12, characterized in that, The flexible connector has a first chip slot and a second chip slot defined in the flexible connector, wherein the first printed chip and the second printed chip are received in the first chip slot and the second chip slot, respectively.

14. The inkjet printhead cartridge according to claim 13, characterized in that, The flexible connector is electrically connected to the first row of bonding pads and the second row of bonding pads.

15. The inkjet printhead cartridge according to claim 14, characterized in that, The flexible connector includes electrical contacts at the end face for connecting to complementary contacts of the printhead carriage.

16. The inkjet printhead cartridge according to claim 1, characterized in that, Each of the first ink reservoir, the second ink reservoir, the third ink reservoir, and the fourth ink reservoir includes at least one of the following: A foam insert for providing back pressure for supplying ink to the corresponding print chip; and A filter is positioned upstream of each ink delivery tank.

17. A scanning inkjet printer, characterized in that, The scanning inkjet printer includes: bracket; The inkjet printhead box according to claim 1, wherein the inkjet printhead box is mounted on the bracket; A lateral movement mechanism, wherein the lateral movement mechanism is used to reciprocate laterally on the page; and A media supply mechanism for advancing media relative to the inkjet printhead cartridge after each lateral movement of the carriage.

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