Abstract: An ink storage device is proposed. The ink storage device is provided to store ink supplied to an inkjet head of an inkjet printer, and includes an ink storage unit, a gas buffer unit connected to the ink storage unit and a gas pressure control device, a gas valve adjusting connection between the ink storage unit and the gas buffer unit, a supply tube supplying ink in the ink storage unit to the inkjet head, a head valve adjusting connection between the ink storage unit and the inkjet head, an injection tube injecting ink into the ink storage device, and an injection valve opening and closing the injection tube. The ink storage unit and the gas buffer unit are separated from each other, so even when an ink storage space is tiny, the meniscus state can be maintained with the gas pressure control device applying sufficient negative pressure.

Abstract: Proposed is a method for manufacturing a perovskite solar cell module encapsulated with a self-cleaning thin film by using an inkjet printing process. The method includes a boundary line forming step and a micro lens forming step. The boundary line forming step is to form boundary lines on the surface of an organic or inorganic film surrounding a perovskite solar cell array by an inkjet printing process, and the micro lens forming step is to form a micro lens array on the surface of the organic or inorganic film surrounding the perovskite solar cell array such that each of the micro lenses is surrounded by the boundary line. The boundary line is first formed to demarcate regions corresponding to the respective micro lenses, and the micro lenses are then formed in the regions surrounded by the boundary line, so that micro lenses with a high aspect ratio are densely formed.

Abstract: Proposed is an ink storage device for multi-head inkjet printers including a first section which is an airtight space where ink supplied to two or more inkjet heads is stored, and where a plurality of supply holes is formed to which a plurality of supply pipes for supplying ink to each of the two or more inkjet heads is connected, a second section isolated from the first section, which is an airtight space where ink recovered from the two or more inkjet heads is stored, and where a plurality of recovery holes is formed to which a plurality of recovery pipes for recovering ink from each of the two or more inkjet heads is connected, and a gas connection adjustment part including a gas passage through which upper air may move between the first and second sections, and a gas valve to open and close the gas passage.

Abstract: Disclosure is an ink supply system for an ink-jet head with a steam cleaning function. The ink supply system includes an ink-jet head including a nozzle, an ink storing device, a gas pressure control system applying negative or positive pressure to the ink storing device, a cleansing solution storing part, and a steam generating device changing at least a part of the cleansing solution into steam, wherein the cleansing solution or the cleansing solution steam is inserted into the ink storing device to clean the ink storing device and the ink-jet head. The ink supply system cleans quickly and completely residue of ink to prevent contamination during the process of changing and using ink, and the ink storage, the ink-jet head, and the ink flow path are cleaned by evaporated cleansing solution during long-term printing, thereby maintaining the ink-jet head and the ink supply system into the initial state.

Abstract: Proposed are an ink supply system of an ink-jet head provided with an emergency drain function and an ink-jet printer having the ink supply system. The ink supply system includes an ink-jet head, an ink storage apparatus, a supply flow path configured to supply ink to the ink-jet head, a recovery flow path configured to return at least some of ink to the ink storage apparatus, a flow path blocker configured to block an ink flow in an emergency situation, a flow path changer configured to block an ink flow and to connect a drain pipe with the ink-jet head in the emergency situation, the drain pipe connected to the flow path changer and connected to the ink-jet head in the emergency situation, a drain ink storage portion configured to drain and store ink in the emergency situation, and a drain portion configured to drain ink in the emergency situation.

Abstract: Disclosure relates to an ink storage apparatus with a rotating type ink storage pouch. The ink storage apparatus storing ink to supply the ink to an ink-jet head includes a nozzle ejecting ink includes an ink pouch configured to store ink to supply the stored ink to the ink-jet head, an airtight casing connected to a gas pressure control system, a pouch holding part configured to hold the ink pouch while the ink pouch is inclined at a predetermined angle, and a pouch rotating part configured to rotate the pouch holding part on a predetermined rotating shaft to agitate the ink stored in the ink pouch, wherein the gas pressure control system is configured to control gas pressure of an internal space of the airtight casing, thereby allowing the ink stored in the ink pouch to maintain the meniscus state thereof at the ink-jet head.

Abstract: An inkjet printer gas pressure controller provided with a negative pressure test line, an inkjet printer including the gas pressure controller, and a method of testing negative pressure in the inkjet printer are proposed. The gas pressure controller having the negative pressure test line for controlling gas pressure includes a negative pressure generation unit capable of suctioning air and applying negative pressure through an output tube, a positive pressure generation unit capable of exhausting the air and applying positive pressure through the output tube, a negative pressure test line capable of testing the negative pressure generated by the negative pressure generation unit when connected to the negative pressure generation unit, and a pressure control module for controlling the negative pressure or positive pressure to be applied through the output tube by controlling a connection relationship between the negative pressure generation unit, the positive pressure generation unit, and the output tube.

Abstract: Proposed is a head assembly for an ink-jet printer. The head assembly includes a head module including a head discharging ink and a reservoir storing the ink, a fixing portion including a pressure controller configured to control a gas pressure, the fixing portion including a control driver configured to control the head, and includes a stage frame on which the head module and the fixing portion are mounted, the stage frame being connected to a moving device. The head module is capable of being attached to and detached from the stage frame, and connecting portions are formed on portions where the head module and the stage frame contact, so that a pipe and a wiring formed on the head module are connected to a pipe and a wiring which are connected to the fixing portion and which are inserted into or passing through the stage frame.

Abstract: Proposed is a multi-needle head. The multi-needle head includes at least one adapter mounted with a needle in which liquid is discharged therethrough, and includes a holder in which the adapter is fixed. An O-ring having an outer diameter thereof larger than a width of a body of the adapter is coupled to the body of the adapter, a fixing hole into which the body of the adapter is inserted is formed in the holder, and an O-ring fixing portion having an inner diameter thereof larger than an inner diameter of the fixing hole is formed in the middle of the fixing hole such that the O-ring is positioned at the O-ring fixing portion. A vertical width of the O-ring fixing portion is larger than a vertical width of the O-ring, thereby allowing a height of the adapter that is fixed to the holder to be adjusted.

Abstract: Proposed is a method for manufacturing a perovskite solar cell module encapsulated with a self-cleaning thin film by using an inkjet printing process. The method includes a boundary line forming step and a micro lens forming step. The boundary line forming step is to form boundary lines on the surface of an organic or inorganic film surrounding a perovskite solar cell array by an inkjet printing process, and the micro lens forming step is to form a micro lens array on the surface of the organic or inorganic film surrounding the perovskite solar cell array such that each of the micro lenses is surrounded by the boundary line. The boundary line is first formed to demarcate regions corresponding to the respective micro lenses, and the micro lenses are then formed in the regions surrounded by the boundary line, so that micro lenses with a high aspect ratio are densely formed.

Abstract: An inkjet printer gas pressure controller provided with a negative pressure test line, an inkjet printer including the gas pressure controller, and a method of testing negative pressure in the inkjet printer are proposed. The gas pressure controller having the negative pressure test line for controlling gas pressure includes a negative pressure generation unit capable of suctioning air and applying negative pressure through an output tube, a positive pressure generation unit capable of exhausting the air and applying positive pressure through the output tube, a negative pressure test line capable of testing the negative pressure generated by the negative pressure generation unit when connected to the negative pressure generation unit, and a pressure control module for controlling the negative pressure or positive pressure to be applied through the output tube by controlling a connection relationship between the negative pressure generation unit, the positive pressure generation unit, and the output tube.

Abstract: Disclosure relates to an ink storage apparatus with a rotating type ink storage pouch. The ink storage apparatus storing ink to supply the ink to an ink-jet head includes a nozzle ejecting ink includes an ink pouch configured to store ink to supply the stored ink to the ink-jet head, an airtight casing connected to a gas pressure control system, a pouch holding part configured to hold the ink pouch while the ink pouch is inclined at a predetermined angle, and a pouch rotating part configured to rotate the pouch holding part on a predetermined rotating shaft to agitate the ink stored in the ink pouch, wherein the gas pressure control system is configured to control gas pressure of an internal space of the airtight casing, thereby allowing the ink stored in the ink pouch to maintain the meniscus state thereof at the ink-jet head.

Abstract: Proposed are an ink supply system of an ink-jet head provided with an emergency drain function and an ink-jet printer having the ink supply system. The ink supply system includes an ink-jet head, an ink storage apparatus, a supply flow path configured to supply ink to the ink-jet head, a recovery flow path configured to return at least some of ink to the ink storage apparatus, a flow path blocker configured to block an ink flow in an emergency situation, a flow path changer configured to block an ink flow and to connect a drain pipe with the ink-jet head in the emergency situation, the drain pipe connected to the flow path changer and connected to the ink-jet head in the emergency situation, a drain ink storage portion configured to drain and store ink in the emergency situation, and a drain portion configured to drain ink in the emergency situation.

Abstract: An inkjet printer configured to control the temperature of ink discharged from nozzles of an inkjet head is proposed. The inkjet printer includes: an inkjet head including a plurality of nozzles configured to discharge ink, an ink reservoir configured to store ink supplied to the inkjet head, a supply channel configured to supply the ink in the ink reservoir to the inkjet head, a pressure control device connected to the ink reservoir through a pressure control tube and configured to maintain the meniscus of the ink injected into the inkjet head, and the ink temperature control unit configured to control temperature of the ink discharged from the inkjet head.

Abstract: Proposed is a head assembly for an ink-jet printer. The head assembly includes a head module including a head discharging ink and a reservoir storing the ink, a fixing portion including a pressure controller configured to control a gas pressure, the fixing portion including a control driver configured to control the head, and includes a stage frame on which the head module and the fixing portion are mounted, the stage frame being connected to a moving device. The head module is capable of being attached to and detached from the stage frame, and connecting portions are formed on portions where the head module and the stage frame contact, so that a pipe and a wiring formed on the head module are connected to a pipe and a wiring which are connected to the fixing portion and which are inserted into or passing through the stage frame.

Abstract: Proposed is a method of forming an electrode on a surface of an object by using inkjet printing, the method including forming a buffer on an outer edge of an electrode formation position, and forming the electrode by filling electrode ink inside the buffer, wherein the buffer formation is performed by stacking buffer layers formed by inkjet printing of buffer ink, and hydrophilicity of a surface of each of the buffer layers is lower than hydrophilicity of the object surface. According to an electrode forming apparatus, the buffer constituting the outer edge of the electrode is formed high and the electrode ink is filled inside the buffer to form the electrode, thereby enabling the formation of the electrode having an increased sectional area.

Abstract: An ink storage unit capable of stirring ink by ink circulation is proposed. The ink storage unit, which is configured to store ink for supplying the ink to an inkjet head including a plurality of nozzles to discharge the ink, includes an ink storage container having an inside space configured to store the ink therein, a head supply tube configured to supply the ink stored in the ink storage container to the inkjet head, a head recovery tube configured to recover remaining ink remained in the inkjet head to the ink storage container, a circulation tube configured to drain the ink through a first end thereof connected to the ink storage container and to receive the ink through a second end thereof connected to the ink storage container, and a circulation pump provided in the circulation tube to transfer the ink.

Abstract: An inkjet printer configured to control the temperature of ink discharged from nozzles of an inkjet head is proposed. The inkjet printer includes: an inkjet head including a plurality of nozzles configured to discharge ink, an ink reservoir configured to store ink supplied to the inkjet head, a supply channel configured to supply the ink in the ink reservoir to the inkjet head, a pressure control device connected to the ink reservoir through a pressure control tube and configured to maintain the meniscus of the ink injected into the inkjet head, and the ink temperature control unit configured to control temperature of the ink discharged from the inkjet head.

Abstract: Proposed is a multi-needle head. The multi-needle head includes at least one adapter mounted with a needle in which liquid is discharged therethrough, and includes a holder in which the adapter is fixed. An O-ring having an outer diameter thereof larger than a width of a body of the adapter is coupled to the body of the adapter, a fixing hole into which the body of the adapter is inserted is formed in the holder, and an O-ring fixing portion having an inner diameter thereof larger than an inner diameter of the fixing hole is formed in the middle of the fixing hole such that the O-ring is positioned at the O-ring fixing portion. A vertical width of the O-ring fixing portion is larger than a vertical width of the O-ring, thereby allowing a height of the adapter that is fixed to the holder to be adjusted.

Abstract: Proposed is an ink storage tank that stores ink to supply the ink to an inkjet head equipped with a plurality of nozzles configured to eject the ink, the tank including an agitator configured to agitate the ink in an ink storage space defined in a housing of the ink storage tank, where the agitator includes a rotary shaft horizontally installed in the ink storage space, one or more blades that protrude outward from the rotary shaft, and a rotation drive unit configured to rotate the rotary shaft, and where the bottom surface of the ink storage space has a concavely curved shape corresponding to the trace of the outer edges of the rotating blades. The ink storage tank has an effect of maintaining desired dispersibility of particles in ink due to the agitator having the horizontal rotary shaft and the concavely curved bottom surface of the ink storage space.