EP0947328A2 - Tintenpatrone und Verfahren zur Detektion der restlichen Tintenmenge - Google Patents

Tintenpatrone und Verfahren zur Detektion der restlichen Tintenmenge Download PDF

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Publication number
EP0947328A2
EP0947328A2 EP99302481A EP99302481A EP0947328A2 EP 0947328 A2 EP0947328 A2 EP 0947328A2 EP 99302481 A EP99302481 A EP 99302481A EP 99302481 A EP99302481 A EP 99302481A EP 0947328 A2 EP0947328 A2 EP 0947328A2
Authority
EP
European Patent Office
Prior art keywords
ink
chamber
case
hole
recording head
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP99302481A
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English (en)
French (fr)
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EP0947328A3 (de
EP0947328B1 (de
Inventor
Toyonori Sasaki
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Brother Industries Ltd
Original Assignee
Brother Industries Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Brother Industries Ltd filed Critical Brother Industries Ltd
Priority to EP02029048A priority Critical patent/EP1300248B1/de
Priority to EP02029049A priority patent/EP1300249B1/de
Publication of EP0947328A2 publication Critical patent/EP0947328A2/de
Publication of EP0947328A3 publication Critical patent/EP0947328A3/de
Application granted granted Critical
Publication of EP0947328B1 publication Critical patent/EP0947328B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
    • B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
    • B41J2/01—Ink jet
    • B41J2/17—Ink jet characterised by ink handling
    • B41J2/175—Ink supply systems ; Circuit parts therefor
    • B41J2/17503—Ink cartridges
    • B41J2/17513—Inner structure
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
    • B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
    • B41J2/01—Ink jet
    • B41J2/17—Ink jet characterised by ink handling
    • B41J2/175—Ink supply systems ; Circuit parts therefor
    • B41J2/17503—Ink cartridges
    • B41J2/17553—Outer structure
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
    • B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
    • B41J2/01—Ink jet
    • B41J2/17—Ink jet characterised by ink handling
    • B41J2/175—Ink supply systems ; Circuit parts therefor
    • B41J2/17566—Ink level or ink residue control
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
    • B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
    • B41J2/01—Ink jet
    • B41J2/17—Ink jet characterised by ink handling
    • B41J2/175—Ink supply systems ; Circuit parts therefor
    • B41J2/17566—Ink level or ink residue control
    • B41J2002/17573—Ink level or ink residue control using optical means for ink level indication

Definitions

  • This invention relates to an ink cartridge for holding ink that is supplied to a recording head, that is removably attached to recording heads used in image forming apparatuses, and to an ink volume detection method for the ink cartridge.
  • Image forming apparatuses such as ink jet printers eject ink droplets from nozzles in a recording head mounted on a carriage, thereby recording images on recording media.
  • the ejection of the ink droplets is accomplished by driving actuators such as electric-to-mechanical converter elements or electric-to-thermal converter elements positioned inside the recording head to generate pressure waves.
  • the ink is supplied from an ink cartridge mounted on the recording head so that it can be easily removed and replaced. When air bubbles are mixed in with the ink liquid that is supplied from the ink cartridge, however, this has an adverse effect on the ejection of ink from the nozzles in the recording head.
  • FIG. 20 is diagrammed an example of an ink cartridge structure as disclosed in Japanese Patent Application Laid-Open No. H9-70982/1997.
  • An ink cartridge 150 has an ink supply hole 153 for supplying ink to a recording head 137, and an atmosphere connection hole 155 communicating to the outside atmosphere so as to allow air to flow in from outside the cartridge 150 as the ink volume is diminished by the consumption of ink absorbed in a porous material 152. Accordingly, after the ink cartridge 150 is filled with ink during fabrication, both of these openings (i.e. the ink supply hole 153 and atmosphere connection hole 155) are closed off by a sealing material. Also, as disclosed in Japanese Patent Application Laid-Open No.
  • H7-132611/1995 Gazette
  • the ink cartridge containing ink is sealed in a reduced-pressure condition inside a packaging bag to prevent ink leakage and the intrusion of air into the case prior to cartridge use.
  • the user removes the ink cartridge from the packaging bag, peels away the sealing material, thereby opening the atmosphere connection hole, and connects the ink supply hole to the recording head.
  • the ink supply hole and the atmosphere connection hole are located some distance apart in order both to prevent air from being drawn from the atmosphere connection hole into the ink supply hole via a short circuit and to facilitate use of the ink contained in the case without waste.
  • the ink supply hole and atmosphere connection hole are located on mutually opposing sides of the case, as diagrammed in Fig. 20.
  • the ink supply hole 153 serves also as the ink filling hole
  • the atmosphere connection hole 155 is used as a pressure-reduction hole in order to reduce the pressure inside the case.
  • ink is filled in through the ink supply hole while effecting reduced pressure inside the case.
  • the sealing tape After sealing the ink filling hole (ink supply hole) with the sealing tape, the sealing tape has been heat welded by the application of heat. If the ink filling hole is wet with ink, however, heat welding cannot be adequately performed. When more heat is applied to avoid this, a problem arises in that the ink supply hole is deformed so that it cannot be properly connected to the recording head.
  • the remaining ink volume is continually or periodically detected by a detector installed in the recording apparatus.
  • the recording apparatus advises the user to replace the ink cartridge.
  • This detection of the remaining ink quantity inside the ink cartridge is generally performed by detecting the ink liquid level.
  • the liquid level tends to shake and fluctuate because the ink cartridge is mounted on a carriage that moves in a sweeping motion in the width direction of the recording medium, erroneous detections often to occur. That being so, one measure known in the prior art for reducing the liquid level fluctuations (shaking) is that of providing rib-shaped members inside the cartridge case. This measure, however, requires the case structure to be complex.
  • a suction cap connected to a suction pump is used to cover the recording head and suck out large amounts of ink from the recording head.
  • the positions of the light emitting element and light receiving element relative to the detection site must be accurately established.
  • the ink cartridge is made so that it can be freely attached to and detached from the recording head so that the user can replace it. The condition in which the ink cartridge is mounted will be slightly different, therefore, every time the user replaces it.
  • ink sometimes travels along the inner walls of the ink chamber holding the ink and reaches the atmosphere connection chamber adjacent to the ink chamber. This ink sometimes also passes through the atmosphere connection hole and leaks to the outside. If the case is transparent or semi-transparent, the case will become unsightly once ink penetrates into the atmosphere connection chamber. If the ink plugs up the atmosphere connection hole, that will impair the supply of ink to the recording head.
  • a type of ink cartridge is also known wherein, inside the ink cartridge case, a first chamber is provided for accommodating the porous material absorbing ink, and a second chamber is provided downstream from the first chamber, such that ink is supplied to the recording head via an ink supply hole from the second chamber.
  • a vacuum pack such as is described in the foregoing, furthermore, in order to maintain the interior thereof at reduced pressure for extended periods of time, it is necessary that there be space between the ink cartridge and the packaging bag of the pack, which space has a higher degree of vacuum than the interior of the ink cartridge. Supposing that a substantially rectangular ink cartridge is contained in a packaging bag, and that the packaging bag adheres tightly to the cartridge, outside air that gradually penetrates through the packaging bag will relatively quickly fill the slight gap between the packaging bag and the ink cartridge, making it difficult to maintain the reduced pressure condition for any extended period of time. Japanese Patent Application Laid-Open No.
  • H10-250111/1998 discloses a cartridge wherein, in order to secure a prescribed volume for the reduced pressure space, the exterior shape is not made a simple rectangle but rather is made so that a part thereof projects, thus forming a space alongside the projecting part where the packaging bag does not tightly adhere. With this cartridge, holes are sometimes opened in the packaging bag by the cartridge corners.
  • art is disclosed for inserting other components (spacers) inside the packaging bag such as corrugated cardboard or urethane foam which contain air internally and through which air readily passes.
  • a first object thereof is to provide an ink cartridge wherewith bringing a filling apparatus and a pressure reduction apparatus close to the cartridge package for ink filling is rendered easy, and the operation of applying seals to the case openings is made simple.
  • a second object of the present invention is to provide an ink cartridge wherewith the case can be efficiently filled with ink all the way to the corners thereof, wherewith case deformation due to reduced pressure during filling is prevented, and wherewith filling can be done even more efficiently.
  • a third object of the present invention is to provide an ink cartridge that is made so that the remaining ink quantity can be detected utilizing the space that is for filling the case with ink, which suppresses ink liquid level fluctuation even though the case has a simple structure, and wherewith the remaining ink quantity can be detected accurately.
  • a fourth object of the present invention is to provide an ink cartridge wherewith, even when the liquid level fluctuates rapidly due to ink being drawn out from the recording head, and even when there is variation in the position where the sensor is attached in the recording apparatus, accurate remaining ink quantity detection is made possible.
  • a fifth object of the present invention is to provide an ink cartridge wherein the intrusion of ink to the atmosphere connection hole side from the ink chamber is prevented, and wherein, even when there is a slight occurrence of such ink intrusion, leakage to the outside and blocking of the atmosphere connection hole is prevented.
  • a sixth object of the present invention is to provide an ink cartridge wherewith, when ink is being supplied successively from a first chamber to a second chamber in an ink chamber, air bubbles are not drawn directly into the recording head even when air bubbles intrude into the second chamber, and wherewith ink ejection problems caused by air bubbles are prevented.
  • a seventh object of the present invention is to provide an ink cartridge wherewith the inside of the packaging bag used to hermetically seal the ink cartridge is maintained at reduced pressure for an extended period of time, wherewith there is no particular need for any separate component for forming space for that purpose, and wherewith manufacturing costs can be reduced and achieving smaller size is rendered easy.
  • An eighth object of the present invention is to provide a remaining ink quantity detection method wherewith the remaining ink quantity inside the ink cartridge can be accurately detected.
  • an ink cartridge which is removably attached to a recording head and which holds ink supplied to the recording head, comprising: a case having a first surface and a second surface in mutual opposition, the first surface whereof is open, a first cover for covering the first surface, a partitioning wall for separating the interior of the case into a first chamber and a second chamber, respectively, for holding the ink, a porous material accommodated in the first chamber, an ink filling hole formed in the first cover for filling the first chamber and the second chamber with ink, and a pressure reduction hole formed in the first cover and connected to a reduced pressure source for reducing the pressure in the first chamber and the second chamber, wherein the first chamber and the second chamber are connected near the second surface inside the case.
  • the ink filling hole and the pressure reduction hole are in the first surface of the case, wherefore, when performing ink filling in the manufacturing stage, it is only necessary to bring the filling apparatus and the pressure reduction apparatus close to one side of the case, and, after that, sealing need only be effected from one side of the case, thereby rendering the operation easy.
  • the ink passes successively to the second chamber and the first chamber, from the ink filling hole toward the pressure reduction hole, wherefore both chambers can be filled with ink efficiently.
  • ink may be supplied to the recording head from the first chamber through the second chamber, or, alternatively, ink may be supplied to the recording head from the second chamber through the first chamber.
  • an ink supply port for supplying ink in either the first chamber or the second chamber may be formed in the second surface of the case.
  • the ink supply hole is provided in a different surface from the ink filling hole and the pressure reduction hole, wherefore the ink supply hole can be closed off with sealing material prior to ink filling. For this reason, the application of a seal to the ink supply hole is not interfered with by ink adhering to the supply hole as in conventional cartridges.
  • the ink supply hole can be securely sealed prior to cartridge shipment, and ink can be prevented from leaking out when a user mounts the cartridge onto the recording head.
  • the second surface may also be opened, a second cover provided for covering the second surface, and the ink supply hole formed in the second cover.
  • a second cover provided for covering the second surface
  • the ink supply hole formed in the second cover When configured in this way, both end surfaces of the case are open, wherefore it is easy to form the first chamber and the second chamber. Also, while it is necessary to wash the case so that the ink properties are not changed, washing and drying are easy because both end surfaces are open. Because porous material is inserted into the first chamber and covered by a cover member, moreover, assembly is simple.
  • the operation of applying the sealing material for sealing the ink filling hole and the pressure reduction hole in one surface and the sealing material for sealing the ink supply hole in the other surface can be easily done with a roller or the like while the ink cartridge is being conveyed along during manufacture.
  • an atmosphere connection hole for communicating with the first chamber may be formed in the second cover.
  • both the ink supply hole and the atmosphere connection hole are provided on the same surface, wherefore the ink supply hole and the atmosphere connection hole can be simultaneously sealed with sealing material during manufacture.
  • an ink cartridge which is removably attached to a recording head and which holds ink supplied to the recording head, comprising: a case having a first surface and a second surface in mutual opposition and containing ink therein, wherein, an ink filling hole for filling the case with ink and a pressure reduction hole connected to a reduced pressure source for reducing the pressure inside the case are formed in the first surface, an ink supply hole for supplying ink to the recording head is formed in the second surface, the ink filling hole and the pressure reduction hole are closed off by a first sealing material applied to the first surface, and the ink supply hole is closed off by a second sealing material applied to the second surface so that it can be peeled away.
  • the operation of applying the first sealing material for sealing the ink filling hole and the pressure reduction hole in one surface and of applying the second sealing material for sealing the ink supply hole in the other surface can be easily done with a roller or the like while the ink cartridge is being conveyed along during manufacture.
  • the ink supply hole is not used during ink filling, wherefore ink does not leak from the ink supply hole so as to impair the sealability thereof as conventionally. Also, when the cartridge is being mounted on the recording head by a user, it is easy to peel away only the second sealing material in preparation therefor.
  • an atmosphere connection hole is formed which communicates between the inside and the outside of the case.
  • This atmosphere connection hole may be closed off by the second sealing material which can be peeled away.
  • an ink cartridge which is removably attached to a recording head and which holds ink supplied to the recording head, comprising: a case having a first surface and a second surface in mutual opposition, the second surface is open, a partitioning wall for separating the interior of the case into an ink chamber for holding ink and an atmosphere connection chamber, wherein the ink chamber and the atmosphere connection chamber are open on the second surface side, one end of the atmosphere connection chamber communicates to the ink chamber on the first surface side, and the other end of the atmosphere connection chamber communicates to the outside of the case, and a cover for covering the second surface, wherein is formed an ink supply hole for supplying ink to the recording head, connected to the ink chamber.
  • ink is supplied to the recording head from the ink chamber via the ink supply hole formed on the second surface side, while air is inducted into the ink chamber on the first surface side via an atmosphere connection path. Consequently, air is not readily admitted to the ink chamber, and the ink in the ink chamber can be used efficiently. Also, this cartridge has a simple structure, and can be easily assembled by covering the second surface with the cover.
  • the ink chamber may also contain a first chamber and a second chamber, as in the specific example of the present invention, but it may also be configured with a single chamber only.
  • the cover may cover the open surfaces of the ink chamber and the atmosphere connection path, and have a second connecting hole communicating to the atmosphere connection path.
  • an ink cartridge which is removably attached to a recording head and which holds ink supplied to the recording head, comprising: a case having a first surface and a second surface in opposition, both surfaces whereof are open, a partitioning wall for separating the interior of the case into an ink chamber for holding ink and an atmosphere connection path communicating to the outside of the case, wherein the ink chamber is open on the first surface and the second surface sides, a first cover for covering the first surface of the case so that a path is formed for communicating between the ink chamber and the atmosphere connection path, a second cover for covering the second surface of the case, and an ink supply hole that connects to the recording head, formed in the second cover so as to communicate with the ink chamber.
  • the opposing first and second surfaces of the case are open, respectively, wherefore it is easy to form the ink chamber and the atmosphere connection path inside the case. It is necessary to wash the inside of the case beforehand so that the ink characteristics do not change. Both surfaces are open in this cartridge, making washing and drying convenient. Also, assembly is rendered simple by covering the first and second surfaces, respectively, with the first cover and the second cover.
  • the cartridge may have a second partitioning wall for dividing the ink chamber into a first chamber for accommodating the porous material absorbing ink and a second chamber for accommodating ink.
  • One of the chambers, i.e. the first chamber or the second chamber may be covered by the first cover while the other chamber is covered by the second cover.
  • the first chamber may communicate with the atmosphere connection path near the first surface and also communicate with the second chamber near the second surface, while the second chamber communicates with the ink supply hole.
  • ink is supplied to the recording head under a suitable pressure from the ink supply hole via the second chamber by the suction force of the porous material in the first chamber.
  • ink in the second chamber flows out from the ink supply hole, ink is replenished in the second chamber from the porous material in the first chamber while air is taken into the first chamber from the atmosphere connection path.
  • the second chamber ink is consumed, whereupon all the ink is used effectively.
  • an ink cartridge which is removably attached to a recording head and which holds ink supplied to the recording head, comprising: a cartridge case having a mutually opposed first side wall and second side wall, a first partitioning wall positioned substantially parallel to the first side wall of the case so as to separate the interior of the cartridge case into a first chamber and a second chamber, respectively, for accommodating ink, and a second partitioning wall positioned substantially parallel to the first side wall of the case for separating the interior of the case into a first chamber and an atmosphere connection path for communicating with the atmosphere outside the case, wherein one end of the second chamber communicates with one end of the first chamber, the other end of the second chamber is open the outside of the case as an ink supply hole, one end of the atmosphere connection path communicates with the other end of the first chamber, and the other end of the atmosphere connection path is open to the outside of the case.
  • a second partitioning panel (or a first partitioning panel) is placed substantially parallel to a first side wall, wherefore the side wall becomes a two-ply structure so that the strength of the cartridge is increased. For this reason, when the cartridge is being filled with ink, the cartridge is prevented from deforming, even when the interior thereof is under reduced pressure, and ink filling can be accomplished efficiently.
  • the atmosphere connection path may be demarcated between the first side wall and the second partitioning wall, and the second chamber demarcated between the second side wall and the first partitioning wall.
  • an ink supply hole for supplying ink to the recording head may be provided near the one end of the second chamber and the ink in the first chamber supplied to the recording head from the ink supply hole via the second chamber.
  • the other end of the first chamber may be open, the open part covered by the first cover, the one end of the second chamber open, the open portion covered by the second cover, and the ink supply hole formed in the second cover.
  • a third partitioning wall may be provided which extends substantially perpendicular to the first side wall inside the case and connects the lower ends of the first partitioning wall and the second partitioning wall, the first chamber divided by the first, second, and third partitioning walls, and a connecting hole formed in the third partitioning wall to connect between the first and second chambers.
  • one end of the first chamber may be open, the open portion covered by the first cover, the ink filling hole connecting the second chamber and the outside of the case formed in the first cover, one end of the second chamber open, the open portion covered by the second cover, and an atmosphere connection hole communicating with the atmosphere connection path formed in the second cover.
  • an ink cartridge which is removably attached to a recording head and which holds ink supplied to the recording head, comprising: a cartridge case having an upper case surface and a lower case surface, a partitioning wall for dividing the inside of the case into first and second chambers for accommodating ink, respectively, wherein the first and second chambers mutually communicate near the lower case surface, an ink filling hole for filling the second chamber with ink, formed in the upper case surface, a sealing material for closing off the ink filling hole, an ink supply hole for supplying ink to the recording head from the second chamber, formed in the lower case surface, and an atmosphere connection hole for connecting the first chamber to the atmosphere, wherein the second chamber is formed between one side wall of the case and the partitioning wall, and at least one portion of the one side wall is either transparent or semi-transparent.
  • ink when the ink is supplied to the recording head from the ink supply hole of the ink cartridge, ink is supplied from the first chamber to the second chamber, whereupon the first chamber ink decreases in volume first.
  • the first chamber ink When the first chamber ink is depleted, air flows into the second chamber and the second chamber ink decreases in volume.
  • the remaining ink quantity can be known by detecting a fall in the ink liquid level in the second chamber, either visually or with a sensor.
  • ink is filled from the second chamber via the ink filling hole, and the filling hole is closed off with a sealing material after the second chamber and the first chamber have been filled, wherefore the second chamber can be completely filled.
  • erroneous detections of the initial remaining ink quantity can be prevented.
  • the first chamber may be given a larger capacity than the second chamber and made to accommodate the porous material absorbing ink. Even when a large volume of ink is present in the first chamber, due to the suction force of the porous material, ink can be supplied to the recording head from the ink supply hole under suitable pressure. Also, by detecting the remaining ink quantity in the second chamber of smaller capacity, erroneous detections caused by ink wave formation can be prevented.
  • the upper case surface may be configured with a cover attached to the case, and the ink filling hole formed in the cover. When this is done, the structure of the ink cartridge becomes simple. If a sheet material is used as the sealing material, this can be easily applied to the cover so as to close off the ink filling hole.
  • the inner surface of the transparent or semi-transparent portion of the one side wall may have undulating ribs running vertically up and down.
  • a remaining ink quantity sensor that comprises a light emitting component and a light receiving component
  • the light emitted by the light emitting component is reflected at the inner surface of the side wall of the second chamber, whereupon it is scattered by the undulating ribs on that inner surface in directions perpendicular to the undulating ribs, and the reflected light advances toward the light receiving component while spreading out in a plane that includes the light emitting component, the light receiving component, and the detection site on the main case body. Therefore, even in cases where the interval between the detection site and the sensor has slightly changed due to slight differences in the ink cartridge mounting position or sensor attachment position, the light receiving component can safely capture the reflected light. Accordingly, the remaining ink quantity inside the ink cartridge can be unambiguously detected even when there is some degree of variation in the sensor attachment condition or ink cartridge mounting condition.
  • an ink cartridge which is removably attached to a recording head and wherein the remaining ink quantity inside the cartridge is detected by an optical detector having a light emitting component and a light receiving component, comprising: a cartridge case having in its interior an ink chamber for holding ink, and a remaining ink quantity detection site provided on the case, wherein the inner case surface at the detection site has undulating ribs extending in a direction perpendicular to a plane containing the detection-light light emitting component, the light receiving component, and the detection site, and the remaining ink quantity inside the ink chamber is detected by illuminating light to the detection site and receiving the light that is reflected therefrom.
  • the inner surface of the ink chamber that constitutes the site for detecting by the reflected light sensor has undulating ribs extending in a direction perpendicular to a plane that contains the light emitting component and light receiving component of the emitted light sensor and the detection site in the ink chamber, wherefore when light emitted by the light emitting component is reflected at the inner surface of the ink chamber side wall, it is scattered by the undulating ribs on that inner surface in directions perpendicular to the undulating ribs, and advances toward the light receiving component while spreading out in a plane that includes the reflected-light light emitting component and light receiving component and the detection site.
  • the light receiving component can safely capture the reflected light. Accordingly, the remaining ink quantity inside the ink chamber can be unambiguously detected even when there is some degree of variation in the reflected-light sensor attachment condition or ink cartridge mounting condition.
  • the cartridge case having undulating ribs can be formed using a die.
  • the outer case surface at the detection position may have undulating ribs extending parallel to a plane containing the light emitting component, the light receiving component, and the detection site.
  • an ink cartridge which is removably attached to a recording head and which holds ink supplied to the recording head, comprising: a cartridge case having an upper case surface and a lower case surface, a partitioning wall for separating the interior of the cartridge case into a first chamber for holding ink and an atmosphere connection chamber for communicating with the atmosphere outside the case, one end of the wall is joined to the upper case surface, and a path for connecting the first chamber and the atmosphere connection chamber, formed in the upper case surface, wherein the path and the first chamber are connected via a portion of a surface which does not contain an intersection line formed by the intersection of a surface and a surface.
  • the first chamber holding the ink is not connected by an intersection line (or ridge line) formed by the intersection of a surface and a surface, such as the intersection line formed by the upper case surface and the partitioning wall.
  • the first chamber and the path are connected via a curved surface such as the inner surface of the pressure reduction hole diagrammed in Fig. 12, wherefore the ink in the first chamber is prevented from traveling along the intersection line formed by the upper case surface and the partitioning wall and advancing into the path.
  • the upper case surface moreover, need not be integral to the case, but may be a cover member that can be placed over the opening in the empty main case body during manufacture. When this is done, the path can be formed in the cover member, making fabrication of the case itself simple.
  • porous material absorbing ink may be accommodated in the first chamber.
  • the cartridge case may also be configured such that a projecting part that projects inside the first chamber is formed on the upper case surface, at a position apart from the partitioning wall, such that the projecting part pushes against the porous material inside the first chamber.
  • This projecting part corresponds to the wall 27 in Fig. 12.
  • the wall 27 juts out toward the ink chamber, and the inner wall thereof does not contain an intersection line formed by the intersection of a surface and a surface.
  • the path is formed by a concavity extending from the first chamber on the outer side surface of the upper case surface to the atmosphere connection chamber, a first hole connecting the concavity and the first chamber, a second hole connecting the concavity and the atmosphere connection chamber, and sealing material covering the concavity.
  • an ink cartridge which is removably attached to a recording head and which holds ink supplied to the recording head, comprising: a cartridge case having an upper surface and a lower surface, and a partitioning wall for dividing the interior of the case into an ink chamber for holding ink and an atmosphere connection path for communicating to the ink chamber and also communicating to the atmosphere outside the case, wherein the atmosphere connection path extends from the lower surface of the case to the upper surface thereof, a part of the inner wall of the lower surface of the case projects into the atmosphere connection path inside the case, and a connecting hole is passed through the projecting part for communicating between the outside of the case and the atmosphere connection path, whereby ink can be accumulated in the atmosphere connection path inside the case.
  • the ink cartridge based on the ninth aspect of the present invention, even if ink leaks from the ink cartridge chamber and flows into the atmosphere connection path, a connecting hole is formed in the projecting part that projects from the lower surface of the cartridge case toward the interior of the case (cf. 18a in Fig. 4), wherefore the ink will not immediately block the connecting hole.
  • the ink is accumulated above the lower surface inside the case, and so, until it exceeds the height of the projecting part, will not pass through the connecting hole and leak to the outside of the case.
  • an ink cartridge which is removably attached to a recording head and which holds ink supplied to the recording head, comprising: a cartridge case having an upper case surface and a lower case surface; a partitioning wall for dividing the inside of the cartridge case into a first chamber for accommodating a porous material absorbing ink and a second chamber for holding ink, wherein the partitioning wall has a first part that is in opposition to the lower surface of the case, whereby a portion of the second chamber exists between the partitioning wall and the lower case surface, and a connecting hole for connecting the first chamber and the second chamber is formed in the first part of the partitioning wall; an ink supply hole, formed in the lower case surface, for supplying ink from the second chamber'to the recording head; and a baffle plate, provided between the connecting hole and the ink supply hole, for preventing air bubbles from flowing into the ink supply hole from the connecting hole.
  • ink cartridge based on the tenth aspect of the present invention
  • ink is drawn by the negative pressure developed in the recording head from the second chamber through the ink supply hole and, at the same time, ink from the first chamber is drawn into the second chamber through the connecting hole.
  • Air bubbles produced at this time are prevented from flowing into the ink supply hole by the baffle plate. For this reason, ink ejection problems associated with the inflow of air bubbles to the recording head are prevented from occurring. Due to the baffle plate, the air bubbles rise up toward the upper case surface inside the second chamber.
  • the lower case surface is a cover member installed in the case at the time of ink cartridge fabrication.
  • the ink supply hole is formed in this cover member, and the baffle plate is formed in either the cover member or the partitioning wall, or in both. If the lower case surface is made a cover member that can be assembled in the main case body at the time of ink cartridge fabrication, instead of being made integral with the main case body, assembly is made easy, and, even if the baffle plate forms a complex flow path, it may be easily provided in either the cover member or the partitioning wall.
  • the partitioning wall may have a second part that extends from the end of the first part toward the upper case surface, and the second chamber made so that it is divided between a first and second partitioning wall and a case interior wall. If a second chamber is configured in this way, air bubbles will be guided by the baffle plate and rise inside the second chamber along the second part of the partitioning wall and accumulate at the top of the second chamber.
  • the first part of the partitioning wall from the connecting hole to the second part should be inclined toward the upper case surface. If the first part of the partitioning wall is inclined in this way, air bubbles originating from the connecting hole will readily float along the first part of the partitioning wall up to the upper part of the second chamber, whereupon the influx of air bubbles into the ink supply hole is prevented even more effectively.
  • an ink cartridge which is removably attached to a recording head and which holds ink supplied to the recording head, comprising: a cartridge case, and a partitioning wall for dividing the inside of the cartridge case into an ink chamber for holding ink and an empty chamber that communicates to the outside of the case, wherein the ink chamber and the empty chamber do not mutually communicate.
  • an empty chamber (space) inside the cartridge case wherefore, when the cartridge is sealed in a bag and the pressure inside the bag is reduced, that reduced-pressure condition can be maintained for an extended period of time. That is, when the bag is rendered in a reduced-pressure state, although air will gradually find its way into the bag with the passage of time, due to the presence of the empty chamber, the reduced-pressure state can be maintained for a comparatively long period of time.
  • this empty chamber can be secured without the necessity of any other parts, wherefore fabrication is simple, and manufacturing costs can be reduced.
  • the cartridge case may be configured from a main case body one end whereof is open, and a cover member for covering the open part of the main case body, the empty chamber formed by the cover member and the partitioning wall, and a hole provided in the cover member for connecting the empty chamber to the outside of the case.
  • a bag may be used which hermetically seals the ink cartridge and the ink cartridge may be accommodated in a bag under reduced pressure.
  • the ink chamber may have a first chamber for accommodating porous material absorbing ink, and a second chamber that holds ink and communicates with the first chamber via a connecting hole, the second chamber whereof is covered by the cover member, an ink supply hole for supplying ink to the recording head from the second chamber formed in the cover member, and the empty chamber formed adjacent to the second chamber.
  • the ink supply hole for transferring ink from the ink chamber to the recording head may be formed in the cover member, the ink supply hole and the atmosphere connection hole closed off with a sealing material that can be peeled away, and the cartridge case sealed in a bag under reduced pressure.
  • a remaining ink quantity detection method for detecting the remaining quantity of ink in an ink cartridge having a case divided by a plurality of wall surfaces the interior whereof is filled with ink, comprising the steps of: directing detection light onto a ridge part that is formed by the intersection of at least two side surfaces which extend vertically up and down in the case and that extends vertically up and down, and detecting light reflected from the ridge part.
  • capillary action is induced at the ridge part extending vertically up and down and formed by the intersection of at least two inner surfaces of the ink chamber, whereby ink adhering to the inner surfaces of the ink chamber moves immediately, in conjunction with the fall in the ink liquid level, to a point proximate to that ink liquid level, wherefore there will be no erroneous detections of the presence or absence of ink at the detection site, and the remaining ink quantity in the ink chamber can be detected precisely.
  • the remaining ink quantity may be detected using an optical sensor, which optical sensor may be positioned opposite the ridge part.
  • the ridge part may be made of a transparent or semi-transparent material, and the sensor may have a light receiving component and a light emitting component facing the ridge part.
  • the case may comprise a first chamber that communicates with the atmosphere and accommodates a porous material absorbing ink, and a second chamber, the upper part of which is sealed, that communicates with the first chamber and holds ink and the ridge part exists on the second chamber.
  • the ink cartridge may further comprise a partitioning wall for dividing the interior of the case into a first chamber and a second chamber for holding ink, at least part of the wall surface of the second chamber whereof is transparent or semi-transparent, a connecting hole for mutually communicating between the first chamber and the second chamber, an ink filling hole, formed in the upper end of the second chamber, for filling the first chamber with ink from the second chamber via the connecting hole, a sealing member for closing off the ink filling hole, an ink supply hole, formed in the lower end of the second chamber, for supplying ink to the recording head, and an atmosphere connection hole for connecting the first chamber to the atmosphere.
  • the interior surface of the case at the ridge part may have undulating ribs extending perpendicular to a plane containing the light emitting component and the light receiving component of the optical sensor and the ridge part.
  • Fig. 1 is a diagram of the ink cartridge according to this embodiment, showing it connected to a recording head.
  • a head holder 50 for supporting the recording head 72 is mounted on a carriage 52 which moves so as to sweep across a recording medium.
  • this holder 50 is loaded the ink cartridge 1 so that it can be detached.
  • An ink supply hole 17 made in the bottom surface of the ink cartridge 1 fits into a joint member 74 on the head holder 50 side, and ink is distributed through a manifold member 73 to many ink ejection channels in the recording head 72.
  • the recording head 72 ejects ink from the ink ejection channels by the action of actuators consisting of piezoelectric elements or heating elements.
  • the ink cartridge 1 comprises a case 2 made in a rectangular shape from a transparent or semi-transparent resin material, and upper and lower cover members 3 and 4.
  • the case 2 consists of a pair of opposing first side walls 2a and 2b, and, connecting between that pair of side walls, a pair of second side walls 2c and 2d (cf. Fig. 2) so as to form a rectangular tube open at both the upper and lower ends.
  • the upper and lower cover members 3 and 4 are heat welded so as to cover the open upper and lower tube ends.
  • the case 2 is formed so that it is divided in the interior thereof by partitioning walls 5 and 6 that extend substantially parallel to the first side walls 2a and 2b (the left and right walls in Fig.
  • a bottom partitioning wall 7 that joins the lower ends of those two partitioning walls and extends substantially parallel to the open bottom tube end, and partitioning walls 7a, 7b, and 7c that extend vertically from the bottom partitioning wall 7 toward the bottom open tube end.
  • the partitioning walls 5 and 6, the bottom partitioning wall 7, and the partitioning walls 7a and 7b extend so as to bridge between the second side walls 2c and 2d (cf. Fig. 2).
  • first chamber 9 In the space enclosed by the partitioning walls 5 and 6, the bottom partitioning wall 7, and the second side walls 2c and 2d is formed a first chamber 9, the upper face whereof is open at the upper end of the case 2, which accommodates porous material 8 such as polyurethane foam absorbing ink.
  • second chamber 10 In the space enclosed by one of the first side walls 2a, the partitioning wall 5, and the second side walls 2c and 2d is formed a second chamber 10, while in the space enclosed by the other first side wall 2b, the partitioning wall 6, and the second side walls 2c and 2d is formed an atmosphere connection path 11.
  • the second chamber 10 and the atmosphere connection path 11 are each open at their upper ends at the upper surface of the case 2, while the lower ends thereof bend around the lower surface of the bottom partitioning wall and have their lower ends open at the lower surface of the case 2 (cf. Fig. 4).
  • the upper cover member 3 covers the upper ends, respectively, of the first chamber 9, the second chamber 10, and the atmosphere connection path 11, and is secured by heat welding to the upper ends of the side walls 2a, 2b, 2c, and 2d and the partitioning walls 5 and 6, making the chambers 9 and 10 and the path 11 independent.
  • the lower cover member 4 covers the lower ends, respectively, of the second chamber 10 and the atmosphere connection path 11, and is secured by heat welding to the lower ends of the side walls 2a, 2b, 2c, and 2d and the partitioning walls 7a and 7b, making the second chamber 10 and the path 11 independent.
  • the second chamber 10 and the atmosphere connection path 11 substantially constitute an L shape with a vertical part 10a along the side walls 2a and 2b, and horizontal parts 10b and 11b positioned below the first chamber 9.
  • the vertical part 11a and the horizontal part 11b of the atmosphere connection path 11 are connected through a connecting hole 30 provided in the partitioning wall 7b.
  • a connecting hole 15 that connects the first chamber 9 and the second chamber 10. Ink is accommodated in both the first chamber 9 and the second chamber 10, and both of these chambers form the ink chamber.
  • the second chamber 10 serves as a path during ink filling, as is described below, and serves as a relay chamber when ink is being supplied from the first chamber 9 to the recording head 72.
  • the first chamber 9 is formed such that it is sufficiently larger than the second chamber 10.
  • the atmosphere connection path 11 admits air to the first chamber 9 when ink in the first chamber 9 is consumed. A separation is made between the second chamber 10 and the atmosphere connection path 11 by the partitioning wall 7a at the lower surface of the bottom partitioning wall 7.
  • the partitioning walls 5 and 6 are made substantially parallel with the side walls 2a and 2b on either side of the case 2, rendering the sides in a more or less double-walled structure and strengthening the case.
  • the case 2 shaped in this way can be easily formed of resin by a die that separates vertically up and down.
  • an ink filling hole 13 corresponding with the open face at the upper end of the second chamber 10, and a pressure reduction hole 14 for reducing the pressure inside the case during ink filling, facing the open face at the upper end of the first chamber 9.
  • the connecting hole 15 that mutually connects the second chamber 10 and the first chamber 9 is located at the end that is far from the side on which the ink filling hole 13 and pressure reduction hole 14 are located, that is, on the side opposite thereto, thereby enhancing ink filling efficiency and ink consumption efficiency, as will be described below.
  • the first chamber 9 and the atmosphere connection path 11 are connected by a path 16 formed so as to cross the upper end of the partitioning wall 6 in the upper cover member 3. More specifically, this path 16 has a concavity formed in the upper surface of the upper cover member 3, one end whereof communicates to the first chamber 9 via the pressure reduction hole 14, and the other end whereof communicates with the atmosphere connection path 11 via a through hole 16a.
  • the upper cover member 3 has a wall 27 that is in contact with the upper surface of the porous material 8 projecting into the first chamber 9 (cf. Fig. 4). More specifically, the upper cover member 3 is formed so as to be thicker in the portion thereof corresponding with the first chamber 9, so as to slightly compress the ink absorbing material 8.
  • the wall 27 is separated by an interval from the inner surface of the first chamber 9, as will be described below, and the pressure reduction hole 14 is positioned further to the inside of the first chamber 9 than the outer periphery of the wall 27.
  • the connecting hole 15 and the ink supply hole 17 are positioned so as to be mutually offset as seen from the bottom.
  • a rib-shaped baffle plate 31 is formed across the shortest path connecting the connecting hole 15 and the ink supply hole 17.
  • This baffle plate 31 is made to project integrally from the partitioning wall 7 of the case 2, and it is preferable that it be formed so as to join the inner wall surface of the lower cover member 4, but there is no reason why it cannot be made to project integrally from the lower cover member 4.
  • the lower surface 7d of the bottom partitioning wall 7 (cf. Fig. 3) forms an inclined surface that rises from the lower end of the connecting hole 15 toward the vertical part of the second chamber 10.
  • One end of the baffle plate 31 is positioned at the side of the connecting hole 15, while the other end thereof extends to a point near the vertical part of the second chamber 10.
  • the ink filling hole 13 and the pressure reduction hole 14, after ink filling, are closed off by first sealing materials 21 and 22 applied to the outer surface of the upper cover member 3 by heat welding or the like.
  • Th sealing material 22 covers the upper surface thereof so as to secure the path 16.
  • the ink supply hole 17 and the atmosphere connection hole 18 are closed off by a second sealing material 23 that is applied by heat welding or the like such that it can be peeled away.
  • the ink filling hole 13 and the ink supply hole 17 are separated, wherefore the second sealing material 23 is applied to the ink supply hole 17 prior to ink filling.
  • the periphery of the ink supply hole 17 is not wet by ink during filling as with a conventional ink supply hole that doubles as the ink filling hole, wherefore an adequate sealing effect can be obtained even with mild heat welding such as will not deform the ink supply hole.
  • the sealing materials 21 and 22 do not need to be peeled away, wherefore they may be heat welded more strongly even to the point of slightly deforming the upper cover member 3.
  • the sealing materials 21, 22, and 23 are made of a resin, metal foil, or laminated material thereof that is not penetrable by air.
  • a stainless steel screen filter 24 is attached to the face of the ink supply hole 17 on the second chamber 10 side.
  • the screen holes of this filter 24 are of a size such that the ink inside the second chamber 10 will not naturally leak out due to surface tension.
  • a partitioning wall 29 for partitioning the atmosphere connection path 11 into an upper and lower part is formed midway along the vertical part 11a of the atmosphere connection path 11.
  • This partitioning wall 29 extends so that there are differences in height in the vertical direction of the atmosphere connection path 11.
  • a through hole 28 is formed in the high portion thereof, and a concavity is formed so as to provide an ink sump 29a positioned lower than the upper end surface of the through hole 28.
  • the partitioning wall 29 can be molded with the separating parts of a die that separates vertically up and down when molding the case 2 out of resin, thus requiring no special process.
  • an ink sump 4a is formed about the periphery thereof.
  • a space 33 is formed adjacent to the horizontal parts 10b and 11b of the second chamber 10 and the atmosphere connection path 11.
  • This space 33 is divided by the partitioning wall 7c that bridges between the partitioning walls 7a and 7b, is covered below by the lower cover member 4, and does not communicate with the second chamber 10, the first chamber 9, or the atmosphere connection path 11, but does communicate with the outside of the case through an opening 34 provided in the lower cover member 4.
  • the packaging bag 81 accommodates the ink cartridge 1 inside a tubular material, the interior whereof is evacuated with reduced pressure, and both open ends whereof are given fused closures 82.
  • the packaging bag 81 is made of a resin, metal foil, or laminated material thereof that is not penetrable by air.
  • the cross-section of the ink cartridge 1 diagrammed in Fig. 19 corresponds to a cross-section in the C-C plane in Fig. 9.
  • the opening 34 is not covered by the second sealing material 23.
  • Fig. 11, 12, and 13 show details of the configuration of the path 16 parts.
  • the configuration diagrammed in Fig. 11 is given as a reference for explaining problems.
  • the path 16b is formed so as to pass through the upper cover member 3a, thus mutually communicating between the first chamber 9 and the atmosphere connection path 11.
  • the upper face of the path 16b is covered by the sealing material 22 (not shown).
  • the intersection (ridge line) E1 formed by the partitioning wall 6 and the side walls 2c and 2d, and the intersection E2 formed by the partitioning wall 6 and the upper cover member 3 readily collect ink through capillary action.
  • intersections E1 and E2 are continuous with the intersection E3 formed by the inner surface of the path 16b and the partitioning wall 6, ink collected at the intersections E1 and E2 flow to the intersection E3 by capillary action, as indicated by the arrow R, and from there flow out along an intersection E4 inside the atmosphere connection path 11.
  • an unsightly condition develops if the case is transparent or semi-transparent, and ink can also leak out to the exterior of the case or plug the atmosphere connection path 11.
  • the ink supply to the recording head 11 from the first chamber 9 is sometimes blocked.
  • an interval K is opened with the inner surface of the first chamber 9 about the periphery of the wall 27 that projects from the upper cover member 3 toward the first chamber 9, as diagrammed in Fig. 12.
  • the pressure reduction hole 14 is given a circular cylindrical or rounded rectangular shape which does not have intersections on its inner surface, and positioned at the end of the wall 27, removed from the partitioning wall 6.
  • the lower surface of the wall 27, the outer circumference of the wall 27, and the inner surface of the pressure reduction hole 14 are formed so that they do not have inside edge or intersections formed by two planes, and the intersection of the partitioning wall 6 on the first chamber 9 side connects with the atmosphere connection path 11 via these surface portions(flat portions). Accordingly, ink that oozes out when the porous material 8 is compressed by the wall 27 and ink collecting at the intersections on the first chamber 9 side are prevented from flowing out by capillary action to the path 16 or the atmosphere connection path 11.
  • the same effect can be realized by giving the inner surface of the path 16 an edgeless (no intersection) cross-section that has the shape of a semicircular cylinder or rounded rectangle.
  • Fig. 13 is diagrammed an example of the path 16 portion diagrammed in Fig. 12 the structure of which has been modified. With the structure diagrammed in Fig. 13, the wall 27 has been eliminated, wherefore ink is prevented from rising along that wall to the path 16.
  • a remaining ink quantity detection sensor 60 is provided in the carriage 52 of the ink jet printer. More specifically, while the ink cartridge 1 is in the unused state, ink is filled into the porous material 8 in the first chamber 9 and in the second chamber 10 so that no space is left remaining. When the ink is consumed by a recording operation, however, and the ink in the first chamber 9 is depleted, due to the pressure wherewith the ink is drawn by the recording head 72, air enters the second chamber 10 from the first chamber 9, a gap portion develops at the top of the second chamber 10, and the ink liquid level falls. The remaining ink quantity detection sensor 60 detects whether or not there is a remaining ink quantity from changes in the light reflected according to whether or not ink is present on the inner wall surface of that second chamber 10.
  • the remaining ink quantity sensor 60 is configured, as shown in Fig. 15, with a light emitting element 61 and a light receiving element 62 provided on either side of a detection site ⁇ , with a prescribed interval opened in the horizontal direction of the second chamber 10, so that the light emitting element 61 emits light at the detection site ⁇ that is established at a prescribed height position on the side wall 2a of the case 2 looking toward the second chamber 10, and so that the light receiving element 62 can capture the light that is reflected from the inner surface of the side wall at that detection site ⁇ (cf. Fig. 5).
  • the case 2 need only have that portion at the detection site ⁇ made transparent or semi-transparent in order to secure light transmissivity.
  • the detection site ⁇ is established, as diagrammed in Fig. 15, at the place (corner) where the ridge line is formed by the intersection of the inner surface of the side wall 2a and the side wall 2d adjacent thereto and extends up and down, inside the second chamber 10 of the ink cartridge 1. If the detection site ⁇ is established thusly at the ridge line (corner) of the second chamber 10, then, as will be described below, when the height of the ink fluid level inside the second chamber 10 falls precipitously from level h1 to level h2, as diagrammed in Fig.
  • the remaining ink quantity at the point in time where the ink cartridge 1 should be replaced can be made extremely small, so that ink waste that occurs when the ink cartridge 1 is replaced can be held to a minimum.
  • many finely undulating ribs 63 are formed on the inner surface of the side wall 2a looking into the second chamber 10 where the detection site ⁇ is established in a direction perpendicular to the plane containing the light emitting element 61, the light receiving element 62, and the detection site ⁇ , that is, in the vertical up and down direction of the ink cartridge 1, while on the outer surface of the side wall 2a where the detection site ⁇ is established, many finely undulating ribs 64 are formed in a direction parallel to the plane containing the light emitting element 61, the light emitting element 62, and the detection site ⁇ , that is, in the fore-and-aft direction of the ink cartridge 1.
  • the light emitted from the light emitting element 61 when reflected by the inner surface of the side wall 2a of the case 2, is scattered in a substantially horizontal direction (i.e. in a direction parallel to the plane containing the light emitting element 61, the light emitting element 62, and the detection site ⁇ ) by the undulating ribs 63, and advances toward the light emitting element 62 while spreading out in the plane containing the light emitting element 61 and the light emitting element 62 of the sensor 60 and the detection site ⁇ on the case 2.
  • the light reflected when no such undulating ribs are formed on the inner surface of the side wall 2a is indicated by the double-dotted lines in the same figure.
  • the light emitting element 62 can capture the reflected light in a definite way even when there are slight changes in the distance between the sensor 60 and the detection site ⁇ .
  • the remaining ink quantity can be detected unambiguously.
  • the light is represented as being emitted from the light emitting element 61 in a parallel state, but the same benefit can be realized even if the light is emitted so that it spreads.
  • the light that is reflected at the outer surface of the side wall 2a of the case 2 is scattered vertically upward and downward by the undulating ribs 64, and the light reflected at the outer surface of the side wall 2a proceeds toward the light emitting element 62 while spreading outside of the plane containing the light emitting element 61 and light emitting element 62 of the sensor 60 and the detection site ⁇ , wherefore it becomes difficult for the light emitting element 62 to capture that light that is reflected at the outer surface of the side wall 2a which does not contribute to the detection of the remaining ink quantity.
  • the proportion of those components of the light reflected by the inner surface of the side wall 2a that do contribute to remaining ink quantity detection becomes high, whereupon remaining ink volume detection precision is enhanced.
  • the undulating ribs on the inner face of the side wall 2a extend in the horizontal direction, light would be scattered vertically up and down, wherefore, when the distance between the sensor 60 and the detection site ⁇ has changed, as diagrammed in Fig. 16, the allowable position whereat the light emitting element 62 can capture the reflected light would significantly more limited than in the embodiment described above.
  • the case 2 configured as described in the foregoing is formed in a die.
  • the die face corresponding to the inner surface of the side wall 2a where the detection site ⁇ is established is polished in a direction perpendicular to the plane containing the light emitting element 61, the light emitting element 62, and the detection site ⁇
  • the die face corresponding to the outer surface of the side wall 2a where the detection site ⁇ is established is polished in a direction parallel to the plane containing the light emitting element 61, the light emitting element 62, and the detection site ⁇ .
  • an ink cartridge 1 can be easily manufactured wherein many undulating ribs 63 and 64 are formed in the prescribed directions on the inner surface and outer surface, respectively, of the side wall 2a where the detection site ⁇ is established.
  • the light emitting element 61 and the light emitting element 62 are positioned in a horizontal orientation, but this does not constitute a limitation, and it is possible to position the light emitting element 61 and the light emitting element 62 in the vertical dimension of the ink cartridge 1. In that case, however, the orientations of the undulating ribs 63 and 64 formed in the inside and outside surfaces of the side wall 2a, respectively, must be reversed.
  • the method of fabricating the ink cartridge 1 is described next.
  • the case 2 is first molded out of resin, then washed and dried. At this time, both the upper and lower faces of the case 2 are open, wherefore the case 2 can be easily molded with a die that separates up and down.
  • the case must be washed well so that the ink properties do not change, but, with this case shape, the washing liquid readily reaches into the interior portions, so washing can be done easily. Drying can also be performed so that no washing liquid remains.
  • the porous material 8 is inserted into the first chamber 9 from the upper open end of the case 2.
  • This porous material 8 is accommodated in a compressed condition because the upper cover member 3 pushes against it.
  • the upper cover member 3 is heat welded around the lip of the upper opening in the case 2 and at the upper ends of the partitioning walls 5 and 6.
  • the lower cover member 4 is secured by heat welding around the lip of the lower opening in the case 2 and at the lower ends of the partitioning walls 7a, 7b, and 7c.
  • a sealing material 23 which can be peeled away, for covering them.
  • the various types of chamber described earlier can be formed, making the assembly thereof easy.
  • the ink supply hole 17 and the atmosphere connection hole 18 are lined up on one side of the cartridge, wherefore the sealing material 23 for covering these can be applied easily, without the need of being pulled around the outer periphery of the cartridge as conventionally.
  • the pressure in the first and second chambers 9 and 10 is thereby reduced, whereupon the ink passes from the ink filling hole 13 through the second chamber 10 and the connecting hole 15 and thus fills the porous material 8 inside the first chamber 9.
  • the second chamber 10 becomes an ink filling path.
  • the ink enters the second chamber 10 from one end, passes through the connecting hole 15 that is maximally separated therefrom, and enters the first chamber 9, after which it reaches the pressure reduction hole 14 that is maximally separated from the connecting hole 15, wherefore the second chamber 10 itself can be completely filled with ink, while, at the same time, the first chamber 9 can also be efficiently filled with ink.
  • the outside of the case 2 is a reinforced double-walled structure, wherefore the case 2 will not be deformed very much during pressure reduction, for which reason also the two chambers 9 and 10 can be efficiently filled with ink.
  • the pressure in the atmosphere connection path 11 is also reduced simultaneously with the first chamber 9, and the reduced pressure state is maintained even after the sealing material is applied.
  • ink for the ink loaded by this process, ink (so-called deaerated ink) is used from which bubbles and air dissolved therein has been removed to the extent possible.
  • deaerated ink used from which bubbles and air dissolved therein has been removed to the extent possible.
  • the purpose of this is to avoid ink ejection problems that arise when bubbles and air penetrate into the recording head 72.
  • the ink cartridge is hermetically sealed under reduced pressure in the packaging bag 8, as described earlier, in order to prevent bubbles and air from again being dissolved in the deaerated ink.
  • sealing materials 21 and 22 are applied to the ink filling hole 13 and the pressure reduction hole 14.
  • the sealing materials 21 and 22 may be applied in a single strip if, afterwards, only the necessary portions are left remaining.
  • the filling apparatus 101 and the pressure reduction apparatus 102 need only be brought up against the case 2 from one side, and the seals need be only applied from one side of the case 2 also, making for efficient operations.
  • the ink cartridge 1 fabricated in this manner is shipped after being hermetically sealed under reduced pressure inside the packaging bag 81, as described earlier.
  • the user peels away the sealing material 23 applied to the ink supply hole 17 and the atmosphere connection hole 18 of the ink cartridge 1, and couples the ink supply hole 17 via the joint member 74 to the manifold 73 in the recording head 72. Then a suction cap is connected to the recording head 72 and the recording head 72 is filled with ink from the ink cartridge 1, as is commonly known.
  • a negative pressure is caused to act on the ink supplied to the recording head from the second chamber 10.
  • the actuators in the recording head 72 perform an ink ejecting action, thereby producing a negative pressure in the ejection direction and drawing out ink from the ink cartridge 1.
  • the first chamber 9 atmospheric air is drawn in from the side distant from the connecting hole 15, so that not only is the ink in the first chamber 9 utilized effectively, but all of the ink, including the ink that is in the second chamber 10, is used effectively. Also, because the second chamber 10 is completely filled from the beginning as an ink filling path, during remaining ink quantity detection, detection errors will not be made due to inadequate ink filling here. The operation of removing the sealing material 23 is also easy because it is done only on one side of the cartridge.
  • the ceiling surface of the horizontal part 10b of the second chamber 10, that is, the lower surface 7d of the bottom partitioning wall 7, is inclined so that it rises from the lower end of the connecting hole 15 toward the vertical part 10a of the second chamber 10, wherefore air and bubbles do not become trapped at the lower surface of the bottom partitioning wall 7 but rather flow toward the top of the vertical part 10a. That being so, bubbles and air can be prevented from penetrating to the recording head 72 and causing ink ejection failures.
EP19990302481 1998-03-30 1999-03-30 Tintenpatrone und Verfahren zur Detektion der restlichen Tintenmenge Expired - Lifetime EP0947328B1 (de)

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JP9477498 1998-04-07
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Cited By (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1120259A2 (de) * 2000-01-21 2001-08-01 Seiko Epson Corporation Tintenstrahlaufzeichnungsgerät
EP1120258A2 (de) * 2000-01-21 2001-08-01 Seiko Epson Corporation Tintenpatrone und Tintenstrahldruckvorrichtung mit einer derartigen Tintenpatrone
US6325496B1 (en) * 1999-04-26 2001-12-04 Canon Kabushiki Kaisha Ink-jet printing apparatus
US6345889B1 (en) * 1998-07-30 2002-02-12 Casio Computer Co., Ltd. Ink cartridge for ink jet printer and method of making the ink cartridge
EP1247648A2 (de) * 2001-03-30 2002-10-09 Brother Kogyo Kabushiki Kaisha Tintenpatrone, diese Tintenpatrone verwendende Druckvorrichtung, und diese Tintenpatrone verwendendes Verfahren zur Bestimmung der Tintenrestmenge
EP1275509A3 (de) * 2001-07-10 2003-08-20 Pelikan Hardcopy Production AG Tintenpatrone mit Leerkammer
EP1535743A1 (de) * 2003-11-28 2005-06-01 Print-Rite Unicorn Image Products Co. Ltd of Zhuhai Tintenpatrone
US7500738B2 (en) 2003-09-11 2009-03-10 Brother Kogyo Kabushiki Kaisha Ink cartridge
CN102285234A (zh) * 2010-06-17 2011-12-21 兄弟工业株式会社 墨盒
US8534813B2 (en) 2010-06-17 2013-09-17 Brother Kogyo Kabushiki Kaisha Sets of ink cartridges
CN103660588A (zh) * 2012-08-31 2014-03-26 精工爱普生株式会社 容器的制造方法、注入配件、注入装置以及容器
CN104085197A (zh) * 2011-01-26 2014-10-08 精工爱普生株式会社 安装到液体喷射装置的液体容纳容器
EP2839963A3 (de) * 2012-05-23 2016-09-14 Seiko Epson Corporation Flüssigkeitsaufnahmekörper und Aufnahmekörpereinheit
US9475294B2 (en) 2012-07-23 2016-10-25 Seiko Epson Corporation Method for injecting printing material, injection kit, and injection device
USD769966S1 (en) 2013-08-19 2016-10-25 Seiko Epson Corporation Cap for an ink cartridge
US9649847B2 (en) 2012-07-23 2017-05-16 Seiko Epson Corporation Cartridge
US9776418B2 (en) 2012-07-23 2017-10-03 Seiko Epson Corporation Method and apparatus for manufacturing cartridge
CN107264049A (zh) * 2016-03-31 2017-10-20 兄弟工业株式会社 罐
US10384454B2 (en) 2012-07-23 2019-08-20 Seiko Epson Corporation Refilled cartridge and method for manufacturing refilled cartridge

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1808298A1 (de) * 2006-01-16 2007-07-18 Seiko Epson Corporation Flüssigkeitsbehälter

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH07132611A (ja) 1993-11-09 1995-05-23 Seiko Epson Corp インクジェット記録装置及びインクタンクとその製造方法
JPH0970982A (ja) 1995-09-07 1997-03-18 Brother Ind Ltd インクカートリッジ

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4992802A (en) * 1988-12-22 1991-02-12 Hewlett-Packard Company Method and apparatus for extending the environmental operating range of an ink jet print cartridge
JP2960235B2 (ja) * 1991-11-12 1999-10-06 キヤノン株式会社 インク容器、これを用いた記録ヘッドユニットおよびこれを搭載する記録装置
JP3167789B2 (ja) * 1992-06-03 2001-05-21 キヤノン株式会社 インクジェット記録装置及びインク残量低下検知方法
EP0802057B1 (de) * 1993-06-29 2002-10-30 Canon Kabushiki Kaisha Behälter für Flüssigkeit, Tintenstrahlkassette mit diesem Behälter für Flüssigkeit und Tintenstrahlapparat mit dieser Tintenstrahlkassette
DE4328001C2 (de) * 1993-08-20 1997-03-20 Dia Nielsen Gmbh Tintenbehälter
DE69511461T2 (de) * 1994-05-31 2000-04-13 Canon Kk Austauschbare Tintenpatrone mit Verschlussstruktur
US6168266B1 (en) * 1995-09-29 2001-01-02 Canon Kabushiki Kaisha Ink tank cartridge, a manufacturing method thereof and a packaging structure of the ink tank cartridge
JP3039358B2 (ja) * 1996-02-21 2000-05-08 富士ゼロックス株式会社 インク供給装置および記録装置
JPH10787A (ja) * 1996-06-13 1998-01-06 Minolta Co Ltd インクカートリッジ

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH07132611A (ja) 1993-11-09 1995-05-23 Seiko Epson Corp インクジェット記録装置及びインクタンクとその製造方法
JPH0970982A (ja) 1995-09-07 1997-03-18 Brother Ind Ltd インクカートリッジ

Cited By (36)

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US6345889B1 (en) * 1998-07-30 2002-02-12 Casio Computer Co., Ltd. Ink cartridge for ink jet printer and method of making the ink cartridge
US6325496B1 (en) * 1999-04-26 2001-12-04 Canon Kabushiki Kaisha Ink-jet printing apparatus
US7784923B2 (en) 1999-10-08 2010-08-31 Seiko Epson Corporation Ink cartridge, and ink-jet recording apparatus using the same
US6582068B2 (en) 2000-01-21 2003-06-24 Seiko Epson Corporation Ink cartridge, and ink-jet recording apparatus using the same
US6913350B2 (en) 2000-01-21 2005-07-05 Seiko Epson Corporation Ink-jet recording apparatus
EP1120258A3 (de) * 2000-01-21 2001-11-28 Seiko Epson Corporation Tintenpatrone und Tintenstrahldruckvorrichtung mit einer derartigen Tintenpatrone
US7152965B2 (en) 2000-01-21 2006-12-26 Seiko Epson Corporation Ink cartridge, and ink-jet recording apparatus using the same
US8636347B2 (en) 2000-01-21 2014-01-28 Seiko Epson Corporation Ink cartridge, and ink-jet recording apparatus using the same
EP1120258A2 (de) * 2000-01-21 2001-08-01 Seiko Epson Corporation Tintenpatrone und Tintenstrahldruckvorrichtung mit einer derartigen Tintenpatrone
EP1120259A2 (de) * 2000-01-21 2001-08-01 Seiko Epson Corporation Tintenstrahlaufzeichnungsgerät
US6733114B2 (en) 2000-01-21 2004-05-11 Seiko Epson Corporation Ink-jet recording apparatus
US6758556B2 (en) 2000-01-21 2004-07-06 Seiko Epson Corporation Ink cartridge, and ink-jet recording apparatus using the same
US8998394B2 (en) 2000-01-21 2015-04-07 Seiko Epson Corporation Ink cartridge, and ink-jet recording apparatus using the same
EP1120259A3 (de) * 2000-01-21 2001-12-12 Seiko Epson Corporation Tintenstrahlaufzeichnungsgerät
US7048363B2 (en) 2000-01-21 2006-05-23 Seiko Epson Corporation Ink-jet recording apparatus
EP1247648A3 (de) * 2001-03-30 2002-10-30 Brother Kogyo Kabushiki Kaisha Tintenpatrone, diese Tintenpatrone verwendende Druckvorrichtung, und diese Tintenpatrone verwendendes Verfahren zur Bestimmung der Tintenrestmenge
EP1247648A2 (de) * 2001-03-30 2002-10-09 Brother Kogyo Kabushiki Kaisha Tintenpatrone, diese Tintenpatrone verwendende Druckvorrichtung, und diese Tintenpatrone verwendendes Verfahren zur Bestimmung der Tintenrestmenge
EP1275509A3 (de) * 2001-07-10 2003-08-20 Pelikan Hardcopy Production AG Tintenpatrone mit Leerkammer
DE10133465B4 (de) * 2001-07-10 2006-10-05 Pelikan Hardcopy Production Ag Tintenpatrone mit Leerkammer
US7500738B2 (en) 2003-09-11 2009-03-10 Brother Kogyo Kabushiki Kaisha Ink cartridge
EP1535743A1 (de) * 2003-11-28 2005-06-01 Print-Rite Unicorn Image Products Co. Ltd of Zhuhai Tintenpatrone
CN102285234A (zh) * 2010-06-17 2011-12-21 兄弟工业株式会社 墨盒
US8534813B2 (en) 2010-06-17 2013-09-17 Brother Kogyo Kabushiki Kaisha Sets of ink cartridges
CN104085197A (zh) * 2011-01-26 2014-10-08 精工爱普生株式会社 安装到液体喷射装置的液体容纳容器
EP2839963A3 (de) * 2012-05-23 2016-09-14 Seiko Epson Corporation Flüssigkeitsaufnahmekörper und Aufnahmekörpereinheit
US9776418B2 (en) 2012-07-23 2017-10-03 Seiko Epson Corporation Method and apparatus for manufacturing cartridge
US9475294B2 (en) 2012-07-23 2016-10-25 Seiko Epson Corporation Method for injecting printing material, injection kit, and injection device
US9649847B2 (en) 2012-07-23 2017-05-16 Seiko Epson Corporation Cartridge
US9827776B2 (en) 2012-07-23 2017-11-28 Seiko Epson Corporation Method and apparatus for manufacturing cartridge
US10384454B2 (en) 2012-07-23 2019-08-20 Seiko Epson Corporation Refilled cartridge and method for manufacturing refilled cartridge
US10647123B2 (en) 2012-07-23 2020-05-12 Seiko Epson Corporation Refilled cartridge and method for manufacturing refilled cartridge
CN103660588B (zh) * 2012-08-31 2016-03-30 精工爱普生株式会社 容器的制造方法、注入配件、注入装置以及容器
CN103660588A (zh) * 2012-08-31 2014-03-26 精工爱普生株式会社 容器的制造方法、注入配件、注入装置以及容器
USD769966S1 (en) 2013-08-19 2016-10-25 Seiko Epson Corporation Cap for an ink cartridge
CN107264049A (zh) * 2016-03-31 2017-10-20 兄弟工业株式会社 罐
CN107264049B (zh) * 2016-03-31 2021-01-12 兄弟工业株式会社 罐

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EP1300248A2 (de) 2003-04-09
EP1300249A2 (de) 2003-04-09
EP1300249B1 (de) 2008-10-22
EP0947328A3 (de) 2000-05-10
EP1300248A3 (de) 2007-01-24
EP0947328B1 (de) 2005-12-07
EP1300249A3 (de) 2007-01-24
EP1300248B1 (de) 2008-10-22

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