CA2491005C - Ink cartridge - Google Patents

Abstract

An ink cartridge constituted by: a container storing ink therein an having an ink supply port (4) in a leading end side in an insertion direction of the container;
memory means (7) disposed on one of opposite surfaces parallel with the insertion direction of the container, the memory means having an electrode connectable to the recording device; a retaining member (5) disposed on the one surface and located at a trailing end side relative to the memory means in the insertion direction, the retaining member being capable of being engaged or disengaged with the recording device; and another retaining member (6)disposed on the other surface and capable of being engaged or disengaged with the recording device.

Description

INK CARTRIDGE

This application is a division of Canadian Patent Application Serial No. 2,379,725 filed April 2, 2002.
BACKGROUND OF THE INVENTION
The present invention relates to an ink cartridge for supplying ink, under a proper negative pressure state, to a recording head ejecting ink drops in response to printing signals.

A recording device, in which an ink container is mounted detachably in a carriage having an ink jet recording head, has a retaining mechanism that prevents removal of the cartridge due to movement of the carriage during printing operation, and that enables easy disengagement of the cartridge by an external operation.

For example, as disclosed in JP-A-10-44451, such a retaining mechanism is structured so that a protrusion portion to be engaged with an ink cartridge holder is formed on one surface of opposite side surfaces of an ink tank, while a pawl is formed on a pivotable lever on the other surface. Ina state that the protrusion portion is brought into engagement with the ink cartridge holder, the pawl is brought into engagement with the ink cartridge holder by moving the other surface with the protrusion portion as a rotational fulcrum.

However, the retaining mechanism adapted to mount the ink cartridge by rotation of the cartridge is difficult to be applied to an ink container which forms an ink flow passage via an ink supply needle communicating with a recording head.

That is, because the ink supply needle has a predetermined length for ensuring a reliable communication with the ink container, there is a danger that the ink supply needle may be bent or damaged when it receives an external force in a direction other than the axial direction. Accordingly, the ink container has to be moved parallel to the longitudinal direction of the ink supply needle.

Further, as disclosed in JP- A-9-11500, there is proposed an ink cartridge such that elastically deformable levers each having a pawl for engagement with an ink cartridge holder are formed in opposite surfaces of a container storing ink therein so as to enable insertion of the ink cartridge onto the ink supply needle.

Furthermore, as disclosed in JP-A-2001-105587, there is proposed an ink cartridge such that a thin and rectangular parallelepiped container for storing ink has a latch member on a front-surface-side wall in the longitudinal direction, and protrusion portions, for guiding the insertion of the cartridge, on opposite walls in the vicinity of the front-surface-side wall.
However, an ink cartridge provided with memory means storing information concerning the ink cartridge or the like requires reliable connection to minute electrodes, and thus requires reliable positioning.

SUMMARY OF THE INVENTION

The present invention was made in view of the above-noted problems, and an object of the present invention is to provide an ink cartridge that is detachably insertable onto an ink supply needle and that can be mounted in a precise position at which communication with memory means provided in the cartridge can be ensured.

Another obj ect of the invention is to provide an ink cartridge, the capacity of which can be easily changed while using common component parts.

Still another object of the present invention is to provide an ink cartridge including: a container storing ink therein and having an ink supply port in a leading end side in an insertion direction of the container; memory means having an electrode connectable to a recording device, the electrode being disposed on one of opposite surfaces substantially parallel with the insertion direction of the container; and a retaining member disposed on the one surface and located at a trailing end side relative to the electrode in the insertion direction, the retaining member being capable of being engaged or disengaged with the recording device.

Yet another object of the present invention is to provide ink cartridges respectively storing ink of different kinds to be mounted to an ink jet recording device as a set, and each including a container body having an ink supply port and a cover member sealing an opened surface of the container body, wherein the ink supply ports, and members which cooperate with the ink jet recording device are disposed at the same positions with respect to side surfaces of the container bodies of the respective ink cartridges.

The present disclosure relates to the subject matter contained in Japanese patent application Nos.
2001-104526 (filed on April 3, 2001), 2001-149315 (filed on May 18, 2001) , 2001-149788 (filed on May 18, 2001) and 2001-264225 (filed on August 31, 2001).

In one aspect, the present invention resides in an ink cartridge for detachable mounting on a carriage which is reciprocally movable in a recording apparatus and which has an electrode, an engagement portion and an ink supply needle, the ink cartridge comprising:

a container storing ink therein and having an ink supply port connectable to the ink supply needle, the ink supply port being located in a leading end side in an insertion direction of the container into the carriage, the container further having first and second walls opposing each other, the first wall being substantially parallel with the insertion direction of the container into the carriage; an electrode connectable to the electrode of the carriage, the electrode being disposed on the first wall of the container; and a retaining member disposed on the first wall of the container and having an engagement portion which is located at a trailing end side, with respect to the insertion direction, relative to the electrode, and which is engageable with the engagement portion of the carriage, wherein the electrode is connected to the electrode of the carriage when the engagement portion of the retaining member is engaged with the engagement portion of the carriage.

In a still further aspect, the present invention provides an ink cartridge comprising: a first wall provided in a first side portion of the ink cartridge; an ink supply port provided in a second side portion of the ink cartridge which is adjacent to the first side portion, and, the ink supply port is connectable to an ink supply needle of a recording apparatus; at least one electrode being fixed relative to the first wall; and an engagement portion, which is engageable with an engagement portion of a carriage, wherein the electrode and the cartridge engagement portion are arranged in an insertion direction of the ink cartridge with respect to the carriage, wherein the electrode is closer to the ink supply port than the cartridge engagement portion, wherein the at least one electrode contacts a respective at least one electrode of the carriage when the - 4a -engagement portion of the ink cartridge is engaged with the engagement portion of the carriage.

In a further aspect, the present invention provides an ink cartridge for detachably mounting on a carriage of a recording apparatus which has a carriage electrode, a carriage engagement portion and an ink supply needle, the ink cartridge comprising: an ink supply port, provided in a first side portion of the ink cartridge, and, the ink supply port is connectable to the ink supply needle when the ink cartridge is mounted on the carriage; an electrode, connectable to the carriage electrode; and a cartridge engagement portion, engageable with the carriage engagement portion, wherein the electrode contacts the carriage electrode when the cartridge engagement portion is engaged with the carriage engagement portion as the ink cartridge is inserted in the carriage.

In a still further aspect, the present invention provides an ink cartridge for detachably mounting on a cartridge mounting region of a recording apparatus which has an apparatus electrode, an apparatus engagement portion and an ink supply needle, the ink cartridge comprising: an ink supply port, connectable to the ink supply needle when the ink cartridge is mounted on the cartridge mounting region; an electrode, connectable to - 4b -the apparatus electrode; and a cartridge engagement portion, engageable with the apparatus engagement portion, wherein the electrode contacts the apparatus electrode when the cartridge engagement portion is engaged with the apparatus engagement portion as the ink cartridge is inserted in the cartridge mounting region in an insertion direction.

In a still further aspect, the present invention provides an ink cartridge for detachable mounting on a carriage which is reciprocally movable in a recording apparatus and which has an electrode, an engagement portion and an ink supply needle, the ink cartridge comprising: a container storing ink therein and having an ink supply port connectable to the ink supply needle, the ink supply port being located in a leading end side in an insertion direction of the container into the carriage, the container further having first and second faces opposing each other, the first face being substantially parallel with the insertion direction of the container into the carriage; an electrode connectable to the electrode of the carriage, the electrode being disposed on the first face of the container; and a retaining member disposed on the first face of the container, and having an engagement portion which is located at a trailing end side, with respect to the insertion - 4c -direction, relative to the electrode, and which is engageable with the engagement portion of the carriage, wherein the electrode is connected to the electrode of the carriage when the engagement portion of the retaining member is engaged with the engagement portion of the carriage.

Accordingly, in a further aspect, the present invention provides an ink cartridge for detachably mounting on a carriage which is reciprocally movable in a recording apparatus and which has an electrode, an engagement portion and an ink supply needle, the ink cartridge comprising: a container storing ink therein and having an ink supply port connectable to the ink supply needle, the ink supply port being located in a leading end side in an insertion direction of the container into the carriage, the container further having first and second walls opposing each other, the first wall being substantially parallel with the insertion direction of the container into the carriage; an electrode connectable to the electrode of the carriage, the electrode being disposed on the first wall of the container; and a retaining member disposed on the first wall of the container, and having an engagement portion which is located at a trailing end side, with respect to the - 4d -insertion direction, relative to the electrode, and which is engageable with the engagement portion of the carriage, wherein the electrode is connected to the electrode of the carriage when the engagement portion of the retaining member is engaged with the engagement portion of the carriage; wherein the first wall has a first surface part on which at least one electrode is disposed, and a second surface part on which the retaining member is disposed; and wherein the first surface part is one of flush with and recessed from the second surface part.

In a further aspect, the present invention provides an ink cartridge for detachably mounting to a mounting region of a recording device providing with an engagement portion and at least one electrode, the ink cartridge comprising:

a container body having a first wall; at least one electrode fixed relative to the first wall; and a retaining member having an engagement portion and disposed on the first wall at a position higher in a Y-axis direction than the at least one electrode, wherein the engagement portion is engageable with the engagement portion of the mounting region; the Y-axis direction is an insertion direction of the ink cartridge to the mounting region; the at least one electrode is adapted to - 4e -contact the at least electrode of the mounting region when the engagement portion of the ink cartridge is engaged with the engagement portion of the mounting region; the first wall has a first surface part on which the at least one electrode is disposed, and a second surface part on which the retaining member is disposed;
and the first surface part is flush with the second surface part.

BRIEF DESCRIPTION OF THE DRAWINGS

Fig. IA and Fig. 1B are views showing front-side and rear-side external appearances, respectively, of an ink cartridge of a small capacity type according to a first embodiment of the present invention.

Figs. 2A to 2D are a top view, a front view, a bottom view and a side view, respectively, of the ink cartridge according to Fig. 1.

Fig. 3 is a perspective view showing assembly of the ink cartridge according to the first embodiment.

Fig. 4 is a perspective view showing assembly of the ink cartridge according to the first embodiment.

Fig. 5 is a sectional view showing a carriage in which the ink cartridge is mounted, according to a second embodiment of the invention.

- 4f -Fig. 6A and Fig. 6B are views showing a process of mounting the ink cartridge in the carriage.

Fig. 7 is a perspective view showing a structure of a bottom of a container body forming the ink cartridge.

Fig. 8 is a perspective view showing the structure of the opened surface of the container body forming the ink carriage.
Fig. 9A is a perspective view showing a structure of the front surface of the container body forming the ink cartridge;
and Fig. 9B is a view showing a through hole formed in a groove for communication.

Fig. 10 is an enlarged, sectional view showing the structure of a chamber storing negative-pressure generating means.

Fig. 11 is an enlarged, sectional view showing the structure of an air communication valve storage chamber.

Fig. 12A and Fig. 12B are a perspective view and a front view, respectively, showing an exampleof a cartridge-identifying block.

Fig. 13 is a perspective view showing an example of a carriage structured so that a plurality of ink cartridges can be stored in the cartridge.

Fig. 14 is a perspective view showing the carriage viewed from a different direction.

Fig. 15A and Fig. 15B are enlarged views showing the vicinity of an ink supply needle of the carriage and the vicinity of an ink supply port of the ink cartridge, respectively.

Fig. 16A to Fig. 16C are perspective views and a bottom view, respectively, showing an ink cartridge of a large-capacity type according to a third embodiment of the present invention.

Fig. 17A to Fig. 17B are views, respectively, showing a structure of ink injection holes of the ink cartridge of a large-capacity type.

Fig. 18 is a view showing a state in which ink cartridges of a small-capacity type and a large-capacity type are mounted in the cartridge.

Fig. 19A is a perspective view showing an example of a memory device, and Fig. 19B is a perspective view showing another example of the memory device.

Fig. 20 is a perspective view showing an ink cartridge according to yet another embodiment of the present invention.
Fig. 21A is a perspective view showing yet another example of the memory device, and Fig. 21B is a perspective view showing still another example of the memory device.

Fig. 22A is a front view of an ink cartridge according to yet another embodiment of the present invention, and Fig. 22B
is enlarged, partial view of the ink cartridge.

DESCRIPTION OF THE PREFERRED EMBODIMENT

The preferred embodiments of the present invention will be described below with reference to the accompanying drawings.
Figs. 1A and 1B and Figs. 2A to 2D show an external appearance of an ink cartridge according to a first embodiment of the present invention. Fig. 3and Fig. 4are perspective viewsshowing assembly of the ink cartridge. The ink cartridge 1 is mainly constituted by a thin and rectangular container body 2 in a box-like shape having an open one surface, and a cover member 3 for sealing the open one surface. An ink supply port 4 is formed to be located at a leading end side in an insertion direction of the cartridge 1 (in this embodiment, on the bottom surface of the container body 2 at an offset position in the longitudinal direction of the container body 2) . Retaining members 5 and 6 are integrally formed on the container body 2 in upper portions of the opposite walls which serve as a forward side and a rearward side respectively when the ink cartridge 1 is inserted or pulled out.

The retaining member 5 located closer to the ink supply port is formed to have a rotational fulcrum at an insertion direction leading end portion (at a portion slightly higher than the lower end of the cartridge in this embodiment) , and an openable upper potion that can be open outwardly. The other, opposite retaining member 6 is formed to assist the holding of the cartridge in cooperation with the retaining member 5.

Each of these retaining members 5 and 6 has a width corresponding to a width of an insertion port provided in a carriage, so that the side surfaces of each retaining member 5, 6 serve as guide portions for restricting the position of the cartridge in the width direction.

Further, a memory means 7 is provided under the retaining member 5 located closer to the ink supply port. The memory means 7 has electrodes 7a on an exposed surface of a board, which are arrayed into two upper and lower rows, and a semiconductor memory element mounted on the rear surface of the board and connected to the electrodes 7a. On the other hand, a valve storage chamber 8 is formed under the other retaining member 6.

A slit portion 9 is formed in the vicinity of the ink supply port 4 and in a central region of the container so that the slit portion 9 opens at least into the leading end of the cartridge and extends in the cartridge insertion/pull-out direction. The slit portion 9 has a length and a width such as to regulate the ink cartridge to orient the opened surface of the ink supply port 4 perpendicularly to an ink supply needle at least before the leading end of the ink supply port 4 reaches the ink supply needle of the carriage.

On the other hand, the carriage 100 to which the cartridge is to be mounted is provided with a recording head 101 disposed in the bottom of the carriage 100, and an ink supply needle (ink supply needles) 102 communicating with the recording head 101, as shown in Fig. 5. An ink cartridge-pressing member (a leaf spring 103 in this embodiment) is disposed in a region separated from the region where the ink supply needle 102 is disposed, and a positioning protrusion 104 is formed between the ink supply needle 102 and the leaf spring 103 to extend in the insertion/pull-out direction of the cartridge. Also, electrodes 106 are disposed on a side wall 105 at the ink supply needle 102 side, and a recess 107 is formed in the upper portion of the side wall 105 so that the recess 107 is engaged with a protrusion 5a of the retaining member S.

By adopting the structure as described above, as shown in Fig. 6A, in case that the cartridge 1 is inserted into the carriage with the ink supply port 4 located at the rear side and the cartridge 1 is pressed against the leaf spring 103, the slit portion 9 is restricted by the protrusion 104. Accordingly, even though a rotational force is applied to the cartridge 1 (in the direction of arrow A in Fig. 6A) by the leaf spring 103 disposed at an offset position in an attempt to move the ink supply port 4 side downward, the posture of the cartridge is restricted to be substantially parallel with the defined insertion/pull-out direction (the vertical direction in this embodiment).

When the cartridge 1 is further pressed against the leaf spring 103 with a finger placed on the top surface 2b of the container body 2, the cartridge 1 generates a component of the force to press the surface of the cartridge 1, where the memory means 7 is provided, against the electrodes 106 of the cartridge 1, because the top surface 2b of the container body 2 is formed as a slope having an angle 0 with the rear side of the cartridge 1 (that is, the retaining member 5 side) being higher. Thus, while the electrodes 7a of the memory means 7 are brought into contact with the electrode 106 securely, the ink cartridge can be pressed and inserted to the ink supply needle 102. In the process of this pressure insertion, as shown in Fig. 6B, the protrusion 5a of the retaining member 5 resists the entire elasticity of the retaining member 5 and then falls into the recess 107 so that the protrusion 5a is engaged with the recess 107. Accordingly, a clear feeling of click is transmitted to the finger so that a user can sense a fact that the cartridge has been mounted in the carriage 100 securely.

Although the retaining member 6 may be provided with a protrusion similarly to the protrusion 5a of the retaining member 5, provision of the protrusion 5a only on the retaining member 5 of the memory means 7 side can prevent mounting failure of the ink cartridge. This is because, if a click feeling is generated by the retaining member 6 of the side where the memory means 7 is not provided, the user may erroneously conclude that the cartridge has been mounted properly though the retaining member 5 of the memory means 7 side is not yet positioned in the proper position, that is, the retaining member 5 stays at a position where the click feeling is not generated yet.

In a state in which the cartridge is mounted, because the position of the cartridge 1 in the insertion/pull-out direction is restricted by the protrusion 5a of the retaining member 5, and the surface of the cartridge 1 where the memory means 7 is provided is pressed against the electrodes 106 of the carriage 100 by an urging force (a force in the direction of arrow A in Fig. 6A) of the spring 103, the contact between the cartridge 1 and the carriage 100 is maintained securely regardless of vibration generated during printing.

On the other hand, in the case where the ink cartridge 1 is to be removed from the carriage 100 for replacement or the like, the retaining member 5 is pressed resiliently toward the container body 2 so that the retaining member 5 is rotated about the portion slightly higher than the lower end and acting as the rotational fulcrum. Consequently, the protrusion 5a of the retaining member 5 is released from the recess 107. When the cartridge 1 is pulled out in this state, the cartridge 1 is guided by the protrusion (the guide piece) 104 and moves parallel with the ink supply needle 102 under the influence of an urging force of the leaf spring 103. Accordingly, the cartridge 1 can be removed from the carriage 100 without having any bending force or the like act on the ink supply needle 102.

Fig. 7 and Fig. 8 show an example of a flow passage formed in the container body 2 constituting the above-mentioned ink cartridge. The container body 2 is partitioned into upper and lower sections by a wall 10 extending substantially horizontally.
The lower section contains a first ink chamber 11. The upper section is defined by a frame 14, with the wall 10 extending continuously as its bottom. A predetermined gap is formed by separating the frame 14 from a wall 12 of the container body 2 so that the gap forms an air communicating passage 13. The frame 14 is further divided into two sections by a vertical wall 15 while a communication port 15a formed in the bottom portion of the frame 14 is left. One of the two sections is formed as a second ink chamber 16, while the other is formed as a third ink chamber 17.

A suction passage 18 is formed in the section of the first ink chamber 11 below the second ink chamber 16, while the suction passage 18 connects a bottom 16a of the second ink chamber 16 to a bottom 2a of the container body 2. In this embodiment, the suction passage 18 is further configured such that a recessed portion 18c (Fig. 9) is formed in a front surface of the container body2, and the recessedportion 18c is sealed with an air impermeable film 57.

A wall 19 including communication ports 19a and 19b is formed at a lower portion of the suction passage 18. An injection hole for injecting ink into the container body 2 from an exterior is formed at a portion opposite to one end of the suction passage 18, while another hole 21 communicating with the first ink chamber 11 is formed parallel with the injection hole 20.

20 The third ink chamber 17 is partitioned by walls 22, 24 and 26 distanced from an upper surface 14a of the frame 14 by a predetermined gap. In the third ink chamber 17, a fourth ink chamber 23 is defined by walls 10, 24, 26 and 27, and a flow passage communicating with a rear surface of a differential-pressure-valve storage chamber 33 is defined by the wall 24 (Fig. 10).

The partitioning wall 26 having a communication port 26a is provided between the lower portion of the wall 24 and the wall 10. The partitioning wall 27 having a communication port 27a at its lower portion is provided so that an ink passage 28 is formed between the partitioning wall 27 and the frame 14.
The upper portion of the ink passage 28 communicates with a front surface side of the ink cartridge 1 through a through hole 29 serving as a filter chamber. In the through hole 29, a filter 55 (Fig. 3) made of a porous material is inserted. In Fig. 8, reference numeral 2c indicates a recess for storing the memory means 7.

As shown in Fig. 8, the through hole 29 is defined by a wall 30 continuous to the wall 27, communicates with the upper end of the ink passage 28 through a recess 29a, and further communicates, via a water-drop-like recess 30a (Fig.9) in the front surface of the container body 2, with a recess 24a in an upper portion of the flow passage partitioned between a wall 34 located in a rear surface of the differential-pressure-valve storage chamber 33, and the wall 24.

A lower portion of the differential-pressure-valve storage chamber 33 and the ink supply port 4 are connected to each other by a flow passage that is constituted by a recess 35 (Fig. 9) formed in the front surface of the container body 2 and the air impermeable film 57 (Fig. 10) covering the recess 35.

As shown in Fig. 9A, a narrow groove 36, a wide groove 37 and a recess 38 are formed in the front surface of the container body 2. The narrow groove 36 meanders so as to provide the largest possible flow resistance. The wide groove 37 is disposed around the narrow groove 36. The recess 38 is rectangular in shape and disposed in an area opposite to the second ink chamber 16.
A frame 39 and ribs 40 are formed in the rectangular recess 38 so as to be slightly lower in height than an open surface of the rectangular recess 38. An air permeable film (not shown) having an ink repellent property and air permeability is stretched andbonded to these frame 39 and ribs 40, so that an air communication chamber is defined. A through hole 41 is formed at the bottom of the recess 38, and communicated with a slender region 43 (Fig.
7) defined by a wall 42 of the second ink camber 16. The narrow groove 36 communicates with the recess 38 at a position closer to the front surface side than the air permeable film. The other end of the region 43 communicates with the valve storage chamber 8 through a through hole 44, a communicating groove 45 and a through hole 46 (Fig.9B).

A window 8a is formed and opened in the leading end of the valve storage chamber 8 in the cartridge insertion direction (in the lower portion of the valve storage chamber 8 in the embodiment, as shown in Fig. 8) so that a cartridge-identifying block 7 (as shown in Fig. 3, Fig. 4 and Fig. 12) can be mounted as described latter. The cartridge-identifying block 70 permits insertion of a valve operating rod and a plurality of identifying pieces 110, 111 and 112 (as shown in Fig. 5) provided on the carriage 100 of the recording device body.

Fig. 10 is a sectional view showing a structure of the vicinity of the differential-pressure-valve storage chamber 33. A spring 50 and a membrane valve 52 are stored in the differential-pressure-valve storage chamber 33. The membrane valve 52 is formed of an elastically deformable material, such aselastomer, and has a through hole Slat its center. The membrane valve 52 includes an annular thick portion 52a circumferentially provided, and a frame 54 formed integrally with the thick portion 52a. The membrane value 52 is fixed to the container body 2 via the frame 54. The spring 50 is supported at one end by a spring receiving portion 52b of the membrane valve 52, and at the other end by a spring receiving portion 53a of a lid member 53, which is fitted to the opening of the storage chamber 33.
Reference numerals 56 and 57 represent air impermeable films bonded onto the front surface side and the opened surface side of the container body 2. The air impermeable film 56 is bonded to the wall 10, the frame 14 and the walls 15, 22, 24, 26, 27, and 42 (Figs. 7 and 8) by welding or the like. The air impermeable film 57 is bonded so that the narrow groove 36 formed in the front surface of the container body 2 and the differential-pressure-valve storage chamber 33 are covered with 25 the air impermeable film 57.

In this structure, ink which has passed through ink passing ports 34a is blocked by the membrane valve 52. When a pressure at the ink supply port 4 is lowered in this state, the membrane valve 52 moves apart from a valve seat 34b against an urging force of the spring 50, so that the ink passes through the through hole 51 and flows to the ink supply port 4 via the flow passage formed by the recess 35.

When an ink pressure at the ink supply port 4 is increased to a predetermined value, the membrane valve 52 is brought into resilient contact with the valve seat 34b by the urging force of the spring 50. As a result, the ink flow is interrupted.
By repeating this operation, ink is discharged to the ink supply port, while a constant negative pressure is maintained.

Fig. 11 is a sectional view showing a structure of the valve storage camber 8 for communication with the air. A through hole 60 is bored in the wall defining the valve storage chamber 8.
A pressing member 61 formed of an elastic material, such as rubber, is movably inserted into the through hole 60 in a state that the circumference of the pressing member 61 is supported by the container body 2. A valve body 65 is provided at the leading end of the pressing member 61 in the insertion direction, so that the valve body 65 is supported by an elastic member 62, such as a leaf spring, having a lower end fixed by a protrusion 63 and a center portion restricted by a protrusion 64. The valve body 65 is constantly urged toward the through hole 60.

The cartridge-identifying block 70 shown in Fig. 12 is located and installed in the other surface of the pressing member 61.
The cartridge-identifying block 70 is constituted by a base which is fixed to a recess 80 of the cartridge (Fig. 9) by means of pawls 70a and 70b. The base is formed with a plurality of grooves (three grooves 71, 72 and 73 in the embodiment), and an arm 74. Each of these grooves 71, 72 and 73 extends parallel to the cartridge insertion direction and has a predetermined width in the widthwise direction of the cartridge. In this embodiment, the arm 74 is provided in the groove 72 on the ink cartridge insertion side (the trailing end of the insertion direction in the embodiment) for pressing the pressing member 61. Depths of these grooves 71, 72 and 73 are set so that the these grooves 71, 72 and 73 can receive respective identifying pieces.

The arm 74 is pivotable about a fulcrum 74a so as to be located further inwardly, and has a pull-out side (the leading end portion of the arm 74 in the insertion direction in this embodiment) that protrudes obliquely into an insertion path of an operating rod 113 (Fig. 14).

Further, protruding portions 71a, 72a and 73a are formed in the respective grooves 71, 72 and 73 so as to face the upper end of identifying pieces 110, 111 and 112 of the carriage 110 respectively.

In the structure as described above, while the position of the arm 74 is fixed, the positions of the protruding portions 71a, 72a and 73a for engagement and the positions of the upper ends of the corresponding identifying pieces 110, 111 and 112 are set in accordance with the kind of ink contained in the cartridge.

Accordingly, it is possible to prevent the cartridge from being mounted erroneously. If the positions of the protruding portions 71a, 72a and 73a for engagement can be changed not only in the insertion direction of the cartridge but also in the width direction of the cartridge, it is made possible to adopt a three-dimensional layout structure for the protruding portions 71a, 72a and 73a for engagement. Accordingly, it is possible to identify a large number of kinds of ink without increasing the identifying region forming area.

Fig. 13 and Fig. 14 show an embodiment of a carriage in which the ink cartridges are mounted. The carriage is structured so that a plurality of ink cartridges'(one black ink cartridge and three color ink cartridges in this embodiment) may be mounted in the carriage.

That is, a first mounting region 120, which is somewhat larger than others in width, is disposed on one side; second, third and fourth mounting regions 121, 122 and 123, which are equal in width to each other, are defined by ribs 124 through 126 and ribs 127 through 129, provided at opposite sides of the carriage, so as to be adjacent to the first mounting region 120.

As described with reference to Fig. 5, each cartridge mounting region has the ink supply needle 102 communicating with the recording head 101, the pressing member(the leaf spring 103 in this embodiment) in a region separated from a region where the ink supply needle 102 is disposed, and the positioning protrusion 104 provided between the leaf spring 103 and the ink supply needle 102 to extend in the cartridge insertion/pull-out direction.
Further, a recess 107' is formed to guide the side portions of the ink cartridge in the retaining member 5 side.

Further, the electrodes 106 are disposed on a side wall 105 close to the ink supply needle 102. In the upper portion of the side wall 105, the recess 107 is formed to be engaged with the protrusion 5a of the retaining member S. In a vicinity of the recess 107, a recess 107a is formed to be engaged with a protrusion 5b of the retaining member 5 (Figs. 1 and 2) protruding from a side portion of the retaining member 5.

Similarly, as shown in Figs. 5 and 14, a region of the carriage with which the retaining member 6 is contacted, is formed with a recess 109 for guiding side portions of the retaining member 6, and a recess 109a engaged with a protrusion 6b of the retaining member 6 (Figs. 1 and 2) protruding from a side portion of the retaining member 6.

In the embodiment, the positioning protrusion 104 is structured so that, as shown in Fig. 15A, a side portion 104a extending parallel with the front surface of the cartridge is formed so as to ensure the positioning reliability and the strength of the thin and long protrusion 104. Corresponding to the positioning protrusion 104, as shown in Fig.15B, the slit portion 9 of the ink cartridge is structured so that at least the cartridge insertion direction leading end thereof is formed with a recess 9a opposing the side portion 104a, the recess 9a being open to the front surface side of the ink cartridge.

Ribs 102a brought into engagement with ribs 4a, each of which is formed into a U-shape in section and between which the ink supply port 4 of the ink cartridge is sandwiched, are formed around the ink supply needle 102. By these ribs, it is possible to maintain the cartridge in a state that the ink supply needle 102 is inserted into the ink supply port 4.

The ink cartridge of a large capacity type mounted to the first mounting region 120 large in width has basically the same structure as that of the above-mentioned embodiment (the ink cartridge of a small capacity type shown in Figs. 1 and 2), as shown in Figs. 16A to 16C. A container body 2' is configured to have an opened surface having the same shape as that of the container body 2, but only a depth W thereof is set to be larger than that of the container body 2. Accordingly, by only altering the depth W of the container body 2' , it is possible to increase the ink quantity to be contained in the container body 2'.
Incidentally, in Figs. 16A and 16B, the members that have the same function as those shown in Fig. 1 and Fig. 2 are referenced correspondingly but marked with a prime.

Layout centers of an ink supply port 4' and memory means 7', particularly, electrodes 7a' of the memory means 7' are set to be located at a predetermined position W1 from the surface of the container body 2' , that is, the bottom, in the same manner as that in the other cartridges. That is, the distance Wl of the layout center of the ink supply port 4' from the surface of the container body 2' in the large capacity ink cartridge 1' is set to be equal to the distance W1 of the layout center of the ink supply port 4 from the surface of the container body 2 in the small capacity ink cartridge 1. Similarly, the distance W1 of the layout center of the electrodes 7a' from the surface of the container body 2' in the large capacity ink cartridge 1' is set to be equal to the distance W1 of the layout center of the electrodes 7a from the surface of the container body 2 in the small capacity ink cartridge 1. In addition, a cartridge-identifying block 70' is mounted in the container body 2' at the surface side. Accordingly, the cartridge-identifying block 70' is disposed in a position the same as the other cartridges.

Retaining members 5' and 6' are disposed at an offset position toward the surface of the container body 2' in the same manner as the ink supply port 4' so as to surely apply a pressing force onto the ink supply port 4' when the cartridge is mounted. In addition, as shown in Fig. 16A, a width W2 of the retaining member 6', to be located closer to a user when the user mounts or removes the ink cartridge 1' to the carriage, is preferably larger than a width W3 of the retaining member 5' in view of operationability.
That is, the width W2 of the retaining member 6' on which the user's thumb is placed is preferably larger than the width W3 of the retaining member 5' on which the user's forefinger is placed.

As shown in Fig. 17B, a tongue portion 130a may be formed integrally with a decorative film 130 bonded to the surface of the film 57' of the container body 2' so that the tongue portion 130a corresponds in region to ink injection holes 20' and 21' (Fig. 17A) and seals the ink injection holes 20' and 21'.

Fig. 18 shows a state in which the ink cartridges 1 of a small capacity type and the ink cartridge 1' of a large capacity type as described above are mounted in the cartridge 100.

In the above-described embodiment, description has been made about the case in which a differential-pressure valve is used as negative pressure generating'means. However, it is apparent that the same effect can be also obtained by using a porous material such as a sponge impregnated with ink so as to maintain the negative pressure by means of the capillary force of the pores.

Also, in the above-described embodiment, the configuration is made so that a plurality of ink cartridges are mounted in a carriage. Alternatively, configuration may be made such that a plurality of carriages are provided, and one or more cartridge (S) is mounted to each of the plural carriages.

As described above, according to the present invention, it is possible to provide an ink cartridge that is detachably insertable to an ink supply needle and that can be mounted in a precise position at which communication with memory means provided in the cartridge can be ensured. Also, it is possible to provide an ink cartridge, the capacity of which can be easily changed while using common component parts.

As described above, the present invention provides, at least, the following arrangements:

(1) An ink cartridge comprising: a container body having a first wall; at least one electrode connected to a memory device, the at least one electrode being fixed relative to the wall;
and an engagement portion movable relative to the wall and being higher in a Y-axis direction than the at least one electrode.

Byway of not-limiting example, as shown in Fig. 2c, a movable engagement protrusion 5a is higher in a Y-axis direction than the electrodes 7a. In this embodiment shown in Fig. 2A to 2C, the movable engagement portion is in the form of the protrusion 5a which is formed on the retaining member 5 in the form of a pivotable lever and which is to be engaged with the recess 107 of the carriage 100, but the present invention should not be restricted thereto or thereby. By way of non-limiting example, the engagement portion could be formed as a recess in the retaining members. In this case, a mating engagement portion in the carriage 100 is preferably formed as a protrusion fit into the recess.

Further, the engagement portion could be directly formed on the wall of the container body 2, not via the retaining member 5. For example, an elastic protrusion may be attached to the wall of the container body 2 to serve as the engagement portion.

More preferably, a spring biased member having a rounded distal end may be provided to the wall of the container body 2. In this case, the rounded distal end is protruded from the wall of the container body 2 by the biasing force of a spring so that the spring biased member, when engagedwith the recess 107, provides a predetermined retaining force to hold the ink cartridge 1 in the carriage 100. During the insertion or removal of the ink cartridge 1 from the carriage 100, the rounded distal end can be retracted toward the interior of the container body 2 against the biasing force of the spring for disengagement from the recess 107 because of the rounded shape of the distal end.

Further, as shown in Figs. 22A and 22B, a protrusion 131 may be formed on a relatively rigid portion of the container body 2 so that the protrusion 131 can be fitted into the recess 107 of the carriage 100 using the elasticity of, at least, portions of the carriage 100 defining the recess 107. That is, using the elasticity of the portions of the carriage 100 defining the recess 107, the ink cartridge 1 having the protrusion 131 can be inserted into, fixed onto and removed from the carriage 100.

(2) In an ink cartridge constructed according to (1), the engagement portion is substantially aligned with the at least one electrode in the Y-axis direction. By way of non-limiting example, as shown in Fig. 2C, the engagement protrusion 5a is aligned with the electrodes 7a in the Y-axis direction. This arrangement remarkably contributes to reliable contact between the electrodes 7a of the ink cartridge 1 and the electrodes 106 of the carriage 100.

(3) In an ink cartridge constructed according to (1) or (2), the wall may have a recessed portion in which the at least one electrode is located. By way of non-limiting example, as shown in Figs. 1A and 7, the wall of the container body 2 has a recess 2a for storing a substrate (the memory device 7), the substrate having a first exposed surface on which the electrodes 7a are disposed and a second, hidden surface on which main circuit components of the memory device 7, electrically connected to the electrodes 7a are mounted. Accordingly, the electrodes 7a are located in the recessed portion 2a. In addition, the main circuit components of the memory device 7 may be disposed at a location other than the recess 2a using a FPC. For example, as shown in Figs. 19A, a memory device 107 includes a substrate 107s, electrodes 107a formed on the substrate 107s, a flexible printed circuit 107f in the form of a flexible sheet, and main circuit components (in the formof a chip) 107m that are electrically connected to the electrodes 107a via the FPC 107f and that are mounted on a hidden surface of the FPC 107f. The memory device 107 can be mounted onto the ink cartridge 1 such that the substrate including the electrodes 107a is mounted on a wall of the ink cartridge 1 and the main circuit components 107f of the memory device 107 are mounted on another wall other than the wall mounting the substrate 107s and the electrodes 107a thereon. Further, the substrate can be dispensed with using the FPC. For example, as shown in Fig. 19B, the memory device 107 can be constructed without using the substrate 107s. That is, the electrodes 107a can be formed directly on the FPC 107f.

(4) In an ink cartridge constructed according to (1) or (2), the wall may have a protruded portion onto which the at least one electrode is located. The protruded portion may be formed on the wall of the container 2 in place of the recess 2a so that the electrodes 7a can be located on the protruded portion. For example, as shown in Fig. 20, a projecting portion 2d may be formed on the container body 2, which has a distal end surface extending parallel to the insertion direction of the ink cartridge 1. The electrodes 7a may be disposed on this distal end surface of the projecting portion 2d.

(5) In an ink cartridge constructed according to (1) or (2), the wall may have a first surface part on which at least one electrode is disposed, and a second surface part on which a pivotable lever having the engagement portion is disposed.
By way of not-limiting example, in the case of the first embodiment, the first surface part is defined by the recess 2a of the wall, and the second surface part is defined by the surface of the wall located above the recess 2a.

(6) In an ink cartridge constructed according to (5), the first surface part is flush with the second surface part. In the first embodiment, the first surface part is somewhat recessed from the second surface part, but these first and second surface parts may be flush with each other completely to provide a planar surface.

(7) In an ink cartridge constructed according to (5), the first and second surf ace parts has a level differencetherebetween.
A small level difference between the first and second surface parts is provided in the first embodiment. This small level difference may be made larger.

(8) In an ink cartridge constructed according to (5), the first surface part may be inclined relative to the second surface part. In the first embodiment, the first surface part is parallel to the second surface part, but may be inclined relative to the second surface part. By way of non-limiting example, Fig. 20 shows an ink cartridge having the first surface part inclined relative to the second surface part.

(9) In an ink cartridge constructed according to any one of (1) to (8), the main circuit components of the memory device are disposed on the first wall. By way of non-limiting example, in the first embodiment, the main components of the memory device are stored in the recess 2c of the wall of the container body 2.

(10) In an ink cartridge according to any one of (1) to (8), the main circuit components of the memory device may be disposed on a second wall other than the first wall. By way of non-limiting example, the main circuit components of the memory device 7 could be disposed on a side wall of the container body 2 using a FPC

(11) In an ink cartridge according to any one of (1) to (10), the at least one electrode may have a width and a length larger than the width. For example, as shown in Fig. 2C, a length L of the electrode 7 in the Y-axis direction is larger than a width W of the electrode 7a in the Z-axis direction. In addition, as shown in Figs. 21A and 21B, each of the electrodes 107a having the larger length and smaller width may be formed into an oval or oblong shape.

(12) In an ink cartridge according to any one of (1) to (11) , an ink supply port is provided, the ink supply port having an axis defining a first side and a second side opposite from the first side in an X-axis direction. For example, in the first embodiment, the ink cartridge 1 has the ink supply port 4 having an axis A, and the axis defines a first side B and a second side C opposite from the first side B with respect to the axis A in an X-axis direction.

(13) In an ink cartridge according to (12), the at least one electrode and the engagement portion are located in the first side. For example, in the first embodiment, the electrodes 7a and the engagement portion 5a are located in the first side B.
(14) In an ink cartridge according to (12) or (13), the at least one electrode and the engagement portion are located on the axis of the ink supply port as viewed in a Y-Z plane.

By way of non-limiting example, a central electrode 7a in the upper row is located on the axis A, and the engagement portion 5a is also located on the axis A, as shown in Fig. 2C.

(15) In an ink cartridge according to (14) , a center of the at least one electrode and a center of the engagement portion are preferably located on the axis of the ink supply port as viewed in the Y-Z plane. By way of non-limiting example, in the first embodiment, a center of the central electrode 7a in the upper row and a center of the engagement portion 5a are located on the axis A as shown in Fig. 2C.

(16) In an ink cartridge according to (12) or (13), the at least one electrode may include plural electrodes arrayed into at least one row, and the at least one row and the engagement portion are preferably located on the axis of the ink supply port as viewed in a Y-Z plane. By way of non-limiting example, in the first embodiment, two upper and lower rows of the electrodes 7a are both located on the axis A as shown in Fig. 2C.

(17) In an ink cartridge according to (16), a center of the at least one row and a center of the engagement portion are preferably located on the axis of the ink supply port as viewed in the Y-Z plane. By way of non-limiting example, in the first embodiment, a center of each of the two upper and lower rows is located on the axis A as shown in Fig. 2C since the electrodes 7a in each of upper and lower rows are symmetrically arranged with respect to the axis A as shown in Fig. 2C.

(18) In an ink cartridge according to any one of (12) to (17), the axis of the ink supply port may be located at a central position with respect to the container body in a Z-axis direction.

The small capacity type ink cartridge 1 employs this arrangement.
(19) In an ink cartridge according to any one of (12) to (17), the axis of the ink supply port may be located at an offset position with respect to the container body in a Z-axis direction.
The large capacity type ink cartridge 1' employs this arrangement.
(20) In an ink cartridge according to any one of (5) to (8), an ink supply port having an axis is provided, and at least one of the first and second surface parts are inclined relative to the axis to present at least in part a tapered configuration of the first wall. For example, in the first embodiment, the wall of the container, where the electrodes 7a and the retaining member 5 having the engagement protrusion 5a are disposed, extends in parallel to the axis A of the ink supply port 4. However, the invention should not be restricted thereto or thereby. By way of non-limiting example, that wall may be inclined in part or entirely with respect to the axis A of the ink supply port 4, so that a portion of the wall, closer to the ink supply port 4 than another portion of the wall in the Y-axis direction, is located closer to the axis A than the other portion of the wall in the X-axis direction. In this case, the electrodes 7a may be disposed on the inclined portion of the wall to be inclined with respect to the axis A.

(21) In an ink cartridge according to any one of(12) to (20), a slot is preferably provided, which extends substantially parallel to the axis of the ink supply port and located in the second side. By way of non-limiting example, in the first embodiment, the slot 9 is formed in the container body 2.

(22) In an ink cartridge according to any one of (1) to (11) , an tnk supply port and a slot are provided, the slot extending in the Y-axis direction, and being located in the vicinity of the ink supply port. In the first embodiment, the slot 9 is formed in the vicinity of the ink supply port 4. The slot 9 is preferably located in the second side, but may be located in the first side.

Claims (52)

1. An ink cartridge for detachably mounting on a carriage which is reciprocally movable in a recording apparatus and which has an electrode, an engagement portion and an ink supply needle, the ink cartridge comprising:

a container storing ink therein and having an ink supply port connectable to the ink supply needle, the ink supply port being located in a leading end side in an insertion direction of the container into the carriage, the container further having first and second walls opposing each other, the first wall being substantially parallel with the insertion direction of the container into the carriage;

an electrode connectable to the electrode of the carriage, the electrode being disposed on the first wall of the container; and a retaining member disposed on the first wall of the container, and having an engagement portion which is located at a trailing end side, with respect to the insertion direction, relative to the electrode, and which is engageable with the engagement portion of the carriage, wherein the electrode is connected to the electrode of the carriage when the engagement portion of the retaining member is engaged with the engagement portion of the carriage;

wherein the first wall has a first surface part on which at least one electrode is disposed, and a second surface part on which the retaining member is disposed;
and wherein the first surface part is one of flush with and recessed from the second surface part.

2. An ink cartridge according to claim 1, further comprising:

a guide member disposed on the second wall and guidable by the carriage when the container is inserted into the carriage.

3. An ink cartridge according to claim 1 or 2, wherein the container is fixable to the carriage exclusively using the retaining member disposed close to the electrode.

4. An ink cartridge according to any one of claims 1 to 3, wherein the retaining member serves also as a guide member when the ink cartridge is inserted into the carriage.

5. An ink cartridge according to any one of claims 1 to 4, wherein the retaining member has side surfaces, both being slidingly guided by the carriage to restrict a position of the first wall of the container in a width direction when the ink cartridge is inserted into the carriage.

6. An ink cartridge according to claim 5, wherein the side surface has a sideward extending projection which is received in a groove of the carriage to move the engagement portion of the retaining member toward the engagement portion of the carriage along a plane parallel to the insertion direction and perpendicular to the width direction when the ink cartridge is inserted into the carriage.

7. An ink cartridge according to any one of claims 1 to 6, wherein the ink supply port has an axis, and the electrode is centered relative to the ink supply port axis such that the plane containing the ink supply port axis intersects the electrode.

8. An ink cartridge according to any one of claims 1 to 7, further comprising:

a guide recess located substantially in a central region of the container and extending in the insertion direction.

9. An ink cartridge according to claim 8, wherein a leading region of the guide recess in the insertion direction is opened to a front surface side of the container.

10. An ink cartridge according to any one of claims 1 to 9, wherein the engagement portion of the retaining member is substantially aligned with the at least one electrode in the Y-axis direction.

11. An ink cartridge according to claim 1, wherein the first surface part is defined by a surface of a circuit board attached to the container and the at least one electrode is located on the surface of the circuit board.

12. An ink cartridge according to claim 1, wherein the first and second surface parts have a level difference therebetween.

13. An ink cartridge according to any one of claims 1 to 10, wherein the first wall has a recessed portion and the first surface part is defined by the recessed portion.

14. An ink cartridge according to any one of claims 1 to 10, wherein the first wall has a protruded portion and the second surface part is defined by the protruded portion.

15. An ink cartridge according to claim 1, wherein the first surface part is inclined relative to the second surface part.

16. An ink cartridge according to any one of claims 1 to 15, wherein main circuit components electrically connected to the electrode are disposed on the first wall.

17. An ink cartridge according to any one of claims 1 to 16, wherein main circuit components electrically connected to the electrode are disposed on a wall other than the first wall.

18. An ink cartridge according to any one of claims 1 to 17, wherein the at least one electrode has a width and a length larger than the width.

19. An ink cartridge according to any one of claims 1 to 18, further comprising:

an ink supply port having an axis extending in a Y-axis direction and defining a first side and a second side opposite from the first side in an X-axis direction.

20. An ink cartridge according to claim 19, wherein the at least one electrode and the engagement portion of the retaining member are located in the first side.

21. An ink cartridge according to claim 20, wherein the at least one electrode and the engagement portion of the retaining member are located on the axis of the ink supply port as viewed in a Y-Z plane.

22. An ink cartridge according to claim 21, wherein a center of the at least one electrode and a center of the engagement portion of the retaining member are located on the axis of the ink supply port as viewed in the Y-Z
plane.

23. An ink cartridge according to any one of claims 1 to 22, wherein the at least one electrode includes plural electrodes arrayed into at least one row, and the at least one row and the engagement portion (5a) of the retaining member are located on the axis of the ink supply port as viewed in a Y-Z plane.

24. An ink cartridge according to claim 21, wherein a center of the at least one row and a center of the engagement portion of the retaining member are located on the axis of the ink supply port as viewed in the Y-Z
plane.

25. An ink cartridge according to any one of claims 1 to 24, wherein the axis of the ink supply port is located at a central position with respect to the container body in a Z-axis direction.

26. An ink cartridge according to any one of claims 1 to 25, wherein the axis of the ink supply port is located at an offset position with respect to the container body in a Z-axis direction.

27. An ink cartridge according to any one of claims 11 to 26, further comprising:

an ink supply port having an axis extending in the Y-axis direction, wherein at least one of the first and second surface parts are inclined relative to the axis of the ink supply port to present at least in part a tapered configuration of the first wall.

28. An ink jet recording device and an ink cartridge according to any one of claims 1 to 27 for supplying said device with ink, the recording device comprising:

a carriage which detachably mounts the ink cartridge thereon, which is reciprocally movable in the recording apparatus, and which includes:

an electrode disposed in a side corresponding to a region where the retaining member is provided, and connected to the electrode;

an engagement portion disposed in the same side, and connected to the engagement portion of the retaining member;

an ink supply needle connected to the ink supply port; and an elastic member for applying an urging force substantially parallel to the insertion direction of the ink cartridge into the carriage.

29. An ink jet recording device according to claim 28, further comprising:

a recess formed in a region opposite to the retaining member, extending in the insertion direction of the ink cartridge, and engageable with a side surface of the retaining member.

30. An ink jet recording device according to claim 28 or 29, wherein regions for mounting a plurality of the ink cartridges are defined, and electrodes of the carriage, which are brought into contact with the electrodes of the plurality of the ink cartridges, are located at positions equidistanced from one side surface of the respective ink cartridges in the respective regions.

31. An ink jet recording device according to any one of claims 1 or 28 to 30, wherein the carriage further includes:

guide portions which slidingly guide side surface of the retaining member to restrict a position of the first surface of the container in a width direction when the ink cartridge is inserted into the carriage.

32. An ink jet recording device according to claim 31, wherein the carriage further includes:

a groove which receives a sidewards-extending projection of the side surface of the retaining member to move the engagement portion of the retaining member toward the engagement portion of the carriage along a plane parallel to the insertion direction and perpendicular to the width direction when the ink cartridge is inserted into the carriage.

33. An ink jet recording device according to any one of claims 28 to 32, supplied with the ink from an ink cartridge according to any one of claims 8, 9 or 10 to 27 when dependent on claim 8 or 9, said recording device comprising:

a guide protrusion engageable with the guide recess;
wherein the elastic member is disposed in a side opposite to the retaining member with respect to the guide protrusion.

34. An ink jet recording device according to claim 33, wherein a leading end region of the guide protrusion in the insertion direction of the ink cartridge has a L-shape in section.

35. A set of ink cartridges according to any one of claims 1 to 27, respectively storing ink of different kinds, mountable to an ink jet recording device, and each comprising a container body having an ink supply port and a cover member sealing an opened surface of the container body, wherein the ink supply port, and members, which are disposed on the respective ink cartridges to cooperate with the ink jet recording device, are located at positions equidistanced from side surfaces of the container bodies of the respective ink cartridges.

36. A set of ink cartridges according to claim 35, wherein the member that cooperates with the ink jet recording device includes at least one of a cartridge identifying block for judging the kind of the ink, the electrode, an air release valve for allowing an ink storage chamber to communicate with the air, and the retaining member for fixing the ink cartridge to the ink inject recording device.

37. A set of ink cartridges according to claim 35 or 36, wherein at least one of the ink cartridges has a larger capacity by way of a greater depth of the container body than the other ink cartridges.

38. A set of ink cartridges according to claim 37, wherein a depth of the container body of at least one of the ink cartridges, as measured from the side surface of the container body, is set larger than the rest.

39. An ink cartridge for detachably mounting to a mounting region of a recording device providing with an engagement portion and at least one electrode, the ink cartridge comprising:

a container body having a first wall;

at least one electrode fixed relative to the first wall; and a retaining member having an engagement portion and disposed on the first wall at a position higher in a Y-axis direction than the at least one electrode, wherein the engagement portion is engageable with the engagement portion of the mounting region;

the Y-axis direction is an insertion direction of the ink cartridge to the mounting region;

the at least one electrode is adapted to contact the at least electrode of the mounting region when the engagement portion of the ink cartridge is engaged with the engagement portion of the mounting region;

the first wall has a first surface part on which the at least one electrode is disposed, and a second surface part on which the retaining member is disposed; and the first surface part is flush with the second surface part.

40. An ink cartridge according to claim 39, wherein the engagement portion is substantially aligned with the at least one electrode in the Y-axis direction.

41. An ink cartridge according to claim 39 or 40, wherein the at least one electrode has a width and a length larger than the width.

42. An ink cartridge according to any one of claims 39 to 41, further comprising:

an ink supply port having an axis extending in the Y-axis direction and defining a first side and a second side opposite from the first side in an X-axis direction perpendicular to the Y-axis direction.

43. An ink cartridge according to claim 42, wherein the at least one electrode and the engagement portion are located in the first side.

44. An ink cartridge according to claim 42 or 43, wherein the at least one electrode and the engagement portion are located on the axis of the ink supply port as viewed in a Y-Z plane parallel to the Y-axis direction and a Z-axis direction which is orthogonal to the X-axis direction and the Y-axis direction.

45. An ink cartridge according to claim 44, wherein a center of the at least one electrode and a center of the engagement portion are located on the axis of the ink supply port as viewed in the Y-Z plane.

46. An ink cartridge according to claim 42 to 43, wherein the at least one electrode includes plural electrodes arrayed into at least one row, and the at least one row and the engagement portion are located on the axis of the ink supply port as viewed in a Y-Z plane parallel to the Y-axis direction and a Z-axis direction which is orthogonal to the X-axis direction and the Y-axis direction.

47. An ink cartridge according to claim 46, wherein a center of the at least one row and a center of the engagement portion are located on the axis of the ink supply port as viewed in the Y-Z plane.

48. An ink cartridge according to any one of claims 42 to 46, wherein the axis of the ink supply port is located at a central position with respect to the container body in a Z-axis direction orthogonal to the X-axis direction and the Y-axis direction.

49. An ink cartridge according to any one of claims 42 to 46, wherein the axis of the ink supply port is located at an offset position with respect to the container body in a Z-axis direction orthogonal to the X-axis direction and the Y-axis direction.

50. An ink cartridge according to any one of claims 42 to 49, further comprising:

a slot extending substantially parallel to the axis of the ink supply port and located in the second side.

51. An ink cartridge according to claim 39 or 40, further comprising:

an ink supply port; and a slot extending in the Y-axis direction, and being located in the vicinity of the ink supply port.

52. An ink cartridge according to claim 39, wherein the first wall has a recessed portion and the first surface port is defined by the recessed portion.