Abstract: An information processing device for a web conference system includes a speaker to output sound, a microphone to receive sound, and a processor. The processor controls the speaker to output a predetermined tone and acquires first sound data from the microphone while the speaker outputting the predetermined tone. The processor sends the first sound data to another information processing device via a network or the like. Second sound data is then received from the other information processing device. The second sound data corresponds to the first sound data as output by the other information processing device. The processor then compares the first sound data and the received second sound data, outputs a notification indicating a result of the comparison between the first and second sound data.

Abstract: In accordance with an embodiment, a diaphragm pump comprises a main liquid chamber; a main actuator configured to change a volume of the main liquid chamber; a sub liquid chamber configured to communicate with a primary side or a secondary side of the main liquid chamber; a sub actuator configured to change a volume of the sub liquid chamber; a first check valve provided on the primary side of the main liquid chamber; a second check valve provided on the secondary side of the main liquid chamber; and a controller configured to control the main actuator and the sub actuator.

Abstract: A liquid circulation device comprises a liquid chamber connected with a liquid discharge section that discharges liquid, a circulation section which circulates the liquid in a flow path containing the liquid chamber and the liquid discharge section, a liquid supply section, a pressure adjustment section and a control section that, according to fluctuation velocity of the pressure, replenishes the liquid through the liquid supply section if the detected pressure is equal to or smaller than a predetermined pressure value or lower than the predetermined pressure value and the pressure fluctuation velocity is equal to or greater than a predetermined speed or faster than the predetermined speed and adjusts the pressure of the liquid discharge section through the pressure adjustment section and the pressure fluctuation velocity is slower than the predetermined speed or equal to or smaller than the predetermined speed.

Abstract: In accordance with an embodiment, a diaphragm pump comprises a main liquid chamber; a main actuator configured to change a volume of the main liquid chamber; a sub liquid chamber configured to communicate with a primary side or a secondary side of the main liquid chamber; a sub actuator configured to change a volume of the sub liquid chamber; a first check valve provided on the primary side of the main liquid chamber; a second check valve provided on the secondary side of the main liquid chamber; and a controller configured to control the main actuator and the sub actuator.

Abstract: A liquid circulation device includes a circulation path through which a liquid circulates through a liquid ejection head, a first pump in the circulation path on a first side of the liquid ejection head, a second pump in the circulation path on a second side of the liquid ejection head, an adjustment tank in the circulation path between the first pump and the second pump, an upstream tank in the circulation path between the liquid ejection head and the first pump, a downstream tank in the circulation path between the liquid ejection head and the second pump, a first pressure sensor configured to detect a pressure in the upstream tank, a second pressure sensor configured to detect a pressure in the downstream tank, and a controller configured to control the first and second pumps based on detected pressures in the upstream and downstream tanks.

Abstract: A liquid circulation device comprises a liquid chamber connected with a liquid discharge section that discharges liquid, a circulation section which circulates the liquid in a flow path containing the liquid chamber and the liquid discharge section, a liquid supply section, a pressure adjustment section and a control section that, according to fluctuation velocity of the pressure, replenishes the liquid through the liquid supply section if the detected pressure is equal to or smaller than a predetermined pressure value or lower than the predetermined pressure value and the pressure fluctuation velocity is equal to or greater than a predetermined speed or faster than the predetermined speed and adjusts the pressure of the liquid discharge section through the pressure adjustment section and the pressure fluctuation velocity is slower than the predetermined speed or equal to or smaller than the predetermined speed.

Abstract: An ink circulation device for an ink jet head includes a first ink storage unit that stores ink to be supplied to an ink jet head, a second ink storage unit that stores ink to be returned from the ink jet head, a pump that operates according to an electric signal to transport the ink from the second ink storage unit to the first ink storage unit, a filter between the pump and the first ink storage unit, a first pressure sensor configured to detect an internal pressure of the first ink storage unit, a second pressure sensor configured to detect an internal pressure between the pump and the filter, and a drive circuit configured to generate the electric signal according to a pressure difference between the internal pressure detected by the second pressure sensor and the internal pressure detected by the first pressure sensor.

Abstract: In accordance with an embodiment, a liquid circulation module comprises a liquid ejection head for ejecting liquid, a storage section connected with the liquid ejection head to store the liquid, a circulation section configured to circulate the liquid in a predetermined circulation path passing through the liquid ejection head and the storage section, a pressure detection section configured to detect pressure in the storage section, a pressure adjusting section configured to adjust pressure in the storage section, and a module controller configured to control a circulation operation of the circulation section and a pressure adjusting operation of the pressure adjusting section independently from a host controller arranged separately from the liquid circulation module and when communicating with the host controller.

Abstract: A liquid circulation device comprises a liquid chamber connected with a liquid discharge section that discharges liquid, a circulation section which circulates the liquid in a flow path containing the liquid chamber and the liquid discharge section, a liquid supply section, a pressure adjustment section and a control section that, according to fluctuation velocity of the pressure, replenishes the liquid through the liquid supply section if the detected pressure is equal to or smaller than a predetermined pressure value or lower than the predetermined pressure value and the pressure fluctuation velocity is equal to or greater than a predetermined speed or faster than the predetermined speed and adjusts the pressure of the liquid discharge section through the pressure adjustment section and the pressure fluctuation velocity is slower than the predetermined speed or equal to or smaller than the predetermined speed.

Abstract: According to one embodiment, an ink circulation device includes a first tank which stores ink to be supplied to an ink jet head, a second tank which stores the ink returned from the ink jet head, and a circulation pump which circulates the ink stored in the second tank to the first tank. In addition, the ink circulation device according to the embodiment further includes a heating device which is in contact with and heats a bottom surface of the first tank, a bottom surface of the second tank, and a bottom surface of the circulation pump.

Abstract: According to one embodiment, a liquid circulation module includes a circulation path through which a liquid circulates to and from a liquid discharging head, a first tank in the circulation path on a first side of the liquid discharging head, a supply tank for storing liquid outside of the circulation path and connected to the first tank via a supply path, a first pump feeding liquid from the supply tank to the first tank, and a controller connected to the first pump and configured to control the first pump to feed liquid from the supply tank to the first tank according to a first driving condition and then, subsequently, to control the first pump to feed liquid from the supply tank to the first tank according to a second driving condition. The second driving condition is different from the first driving condition.

Abstract: A liquid circulation device includes a circulation path through which a liquid circulates to and from a liquid discharging head, the circulation path including a supply flow path on a first side of the liquid discharging head and a collection flow path on a second side of the liquid discharging head, a first tank in the circulation path on the first side of the liquid discharging head, the first tank supplying liquid to the liquid discharging head via the supply flow path and receiving liquid from the liquid discharging head via the collection flow path, a filter in the supply flow path, the filter including an air bubble filter and a before-filter chamber between the first tank and the air bubble filter, and a bypass flow path having a first end fluidly connected to the before-filter chamber and a second end fluidly connected to the collection flow path.

Abstract: A liquid circulation device comprises a liquid chamber connected with a liquid discharge section that discharges liquid, a circulation section which circulates the liquid in a flow path containing the liquid chamber and the liquid discharge section, a liquid supply section, a pressure adjustment section and a control section that, according to fluctuation velocity of the pressure, replenishes the liquid through the liquid supply section if the detected pressure is equal to or smaller than a predetermined pressure value or lower than the predetermined pressure value and the pressure fluctuation velocity is equal to or greater than a predetermined speed or faster than the predetermined speed and adjusts the pressure of the liquid discharge section through the pressure adjustment section and the pressure fluctuation velocity is slower than the predetermined speed or equal to or smaller than the predetermined speed.

Abstract: A liquid circulation device includes a circulation path through which a liquid circulates through a liquid ejection head, a first pump in the circulation path on a first side of the liquid ejection head, a second pump in the circulation path on a second side of the liquid ejection head, an adjustment tank in the circulation path between the first pump and the second pump, an upstream tank in the circulation path between the liquid ejection head and the first pump, a downstream tank in the circulation path between the liquid ejection head and the second pump, a first pressure sensor configured to detect a pressure in the upstream tank, a second pressure sensor configured to detect a pressure in the downstream tank, and a controller configured to control the first and second pumps based on detected pressures in the upstream and downstream tanks.

Abstract: An ink circulation device for an ink jet head includes a first ink storage unit that stores ink to be supplied to an ink jet head, a second ink storage unit that stores ink to be returned from the ink jet head, a pump that operates according to an electric signal to transport the ink from the second ink storage unit to the first ink storage unit, a filter between the pump and the first ink storage unit, a first pressure sensor configured to detect an internal pressure of the first ink storage unit, a second pressure sensor configured to detect an internal pressure between the pump and the filter, and a drive circuit configured to generate the electric signal according to a pressure difference between the internal pressure detected by the second pressure sensor and the internal pressure detected by the first pressure sensor.

Abstract: In accordance with an embodiment, an ink circulation device comprises a pressure chamber including at least two flow holes through which ink flows; a piezoelectric vibration plate constituting a part of a wall of the pressure chamber and to be driven to increase or decrease an inner volume of the pressure chamber; a valve for opening and closing at least one of the two flow holes; a heater affixed on the piezoelectric vibration plate; and a connection section connecting the pressure chamber to an inkjet head.

Abstract: An liquid circulation device comprises a liquid casing, a gas replenishing section and a liquid replenishing section. The liquid casing retains liquid to be supplied to a liquid ejection section for ejecting the liquid and includes a liquid chamber connected with the liquid ejection section in such a manner that the liquid can be circulated therebetween. The ink circulation device increases pressure inside of the liquid casing by replenishing the gas to the liquid casing with the gas replenishing section and replenishing the liquid to the liquid casing with the liquid replenishing section, and meets a relation (?P1*(d1)^2/L1)/(?P2*(d2)^2/L2)>?1/?2.

Abstract: In accordance with an embodiment, a liquid circulation module comprises a liquid ejection head for ejecting liquid, a storage section connected with the liquid ejection head to store the liquid, a circulation section configured to circulate the liquid in a predetermined circulation path passing through the liquid ejection head and the storage section, a pressure detection section configured to detect pressure in the storage section, a pressure adjusting section configured to adjust pressure in the storage section, and a module controller configured to control a circulation operation of the circulation section and a pressure adjusting operation of the pressure adjusting section independently from a host controller arranged separately from the liquid circulation module and when communicating with the host controller.

Abstract: A liquid circulation device comprises a liquid chamber connected with a liquid discharge section that discharges liquid, a circulation section which circulates the liquid in a flow path containing the liquid chamber and the liquid discharge section, a liquid supply section, a pressure adjustment section and a control section that, according to fluctuation velocity of the pressure, replenishes the liquid through the liquid supply section if the detected pressure is equal to or smaller than a predetermined pressure value or lower than the predetermined pressure value and the pressure fluctuation velocity is equal to or greater than a predetermined speed or faster than the predetermined speed and adjusts the pressure of the liquid discharge section through the pressure adjustment section and the pressure fluctuation velocity is slower than the predetermined speed or equal to or smaller than the predetermined speed.

Abstract: In general, according to one embodiment, an inkjet recording apparatus includes an inkjet head, a conveyance motor, a discharge motor, a printing medium surface sensor and a controller. The inkjet head ejects ink on a printing medium. The discharge motor causes discharge of the printing medium. The printing medium surface sensor, locates at the upper-stream side of the inkjet head apart from the inkjet head in a printing medium conveyance direction, senses a foreign substance representing an image printed on the printing medium beforehand. The controller drives the discharge motor to discharge a printing medium without ejecting ink from the inkjet head if an after-printing mode in which printing is made on the printing medium on which the image is printed beforehand is not set if the foreign substance is detected on the printing medium through the printing medium surface sensor.