Abstract: A degassing device removes air dissolved in a liquid under a pressure decreased atmosphere, and includes a liquid tank, a pressure decreasing device, a circulation flow pass, a circulation device, and a variable mechanism. The liquid tank stores the liquid. The pressure decreasing device decreases pressure in the liquid tank. The circulation flow pass communicates different positions of the liquid tank. The circulation device circulates the liquid through the circulation flow pass. The variable mechanism changes a height of an inlet port from the circulation flow pass to the liquid tank in accordance with a height of a liquid surface in the liquid tank.

Abstract: A degassing device removes air dissolved in liquid under a pressure decreased atmosphere. The degassing device includes a liquid tank, a pressure decreasing device, a circulation flow pass, and a control device. The liquid tank stores the liquid. The pressure decreasing device decreases pressure in the liquid tank. The circulation flow pass communicates different positions of the liquid tank. The circulation device circulates the liquid through the circulation flow pass. The control device drives the circulation device at least one of timing before driving the pressure decreasing device and timing before releasing the pressure decreased liquid tank to the atmosphere.

Abstract: A degassing device removes air dissolved in liquid under a pressure decreased atmosphere. The degassing device includes a liquid tank, a pressure decreasing device, and a lifting/lowering device. The liquid tank has a small sectional part and a large sectional part provided above or below the small sectional part and having a horizontal sectional area larger than that of the small sectional part, and stores the liquid. The pressure decreasing device decreases pressure in the liquid tank. The lifting/lowering device lifts and lowers the liquid surface in the liquid tank to the small sectional part and the large sectional part.

Abstract: A degassing device removes air dissolved in liquid under a pressure decreased atmosphere. The degassing device includes a liquid tank, a pressure decreasing device, a circulation flow pass, a circulation device, and a floating body. The liquid tank stores the liquid. The pressure decreasing device decreases pressure in the liquid tank. The circulation flow pass communicates different positions of the liquid tank. The circulation device circulates the liquid through the circulation flow pass. The floating body floats on a liquid surface in the liquid tank. An inlet port from the circulation flow pass to the liquid tank is provided above the liquid surface. The liquid flowing in through the inlet port into the liquid tank falls on the floating body above the liquid surface.

Abstract: A negative pressure regulation valve includes a pressure chamber, a valve member, a diaphragm portion, a pressure receiving plate, and a biasing member. The pressure chamber has a liquid inflow port, and a liquid outflow port formed above the liquid inflow port. The pressure receiving plate is displaced with the diaphragm portion to the inside and the outside of the pressure chamber, thereby changing a capacity of the pressure chamber. The valve member is caused to move with the pressure receiving plate to a closing position for closing the ink inflow port and an opening position for opening the ink inflow port. When the pressure receiving plate is displaced to the inside and the outside of the pressure chamber, the capacity of the pressure chamber changes by a larger amount from an upper part toward a lower part of the pressure chamber with respect to a direction of gravity.

Abstract: A degassing device removes air dissolved in liquid under a pressure decreased atmosphere. The degassing device includes a liquid tank, a pressure decreasing device, a dipping member, and a lifting device. The liquid tank stores the liquid. The pressure decreasing device decreases pressure in the liquid tank. The dipping member is dipped in the liquid in the liquid tank. The lifting device lifts and lowers the dipping member in a dipping state where the dipping member is positioned on a liquid surface of the liquid in the liquid tank and a retracted state where the dipping member is retracted from the liquid surface of the liquid tank.

Abstract: A degassing device removes air dissolved in liquid under a pressure decreased atmosphere. The degassing device includes a liquid tank, a pressure decreasing device, a circulation flow pass, and a circulation device. The liquid tank stores the liquid. The pressure decreasing device decreases pressure in the liquid tank. The circulation flow pass communicates different positions of the liquid tank. The circulation device circulates the liquid through the circulation flow pass. The circulation flow pass includes an outlet port from the liquid tank to the circulation flow pass, and an inlet port from the circulation flow pass to the liquid tank below a liquid surface. A diameter of the inlet port is smaller than a diameter of the outlet port.

Abstract: A negative pressure regulation valve includes an inflow-side pressure chamber, an outflow-side pressure chamber, a communication hole, and a valve member. The valve member is inserted in the communication hole and movable, in accordance with change of pressure inside the outflow-side pressure chamber, to a closing position for closing the communication hole and an opening position for opening the communication hole. The outflow-side pressure chamber includes, as a liquid outflow hole, a first outflow hole formed below the communication hole and a second outflow hole formed above the communication hole. In a case where a first fluid flows out from the outflow-side pressure chamber via the first outflow hole and the second outflow hole, a first flow path resistance generated when the first fluid passes through the first outflow hole is lower than a second flow path resistance generated when the first fluid passes through the second outflow hole.

Abstract: An inkjet recording apparatus includes an ink container, one or more recording heads, an ink flow path, a negative pressure regulation valve, a cap, a suction pump, and a waste ink discharge path. The negative pressure regulation valve includes an inflow-side pressure chamber, an outflow-side pressure chamber, a communication hole, a first outflow hole and a second outflow hole respectively formed in the outflow-side pressure chamber so as to be below and above the communication hole, and respectively communicating with the first outflow path and the second outflow path, and a valve member that opens and closes the communication hole. The first outflow path communicates with the recording heads. The second outflow path communicates with an inside of the cap or a waste ink discharge path, and is provided with an opening/closing valve.

Abstract: A negative pressure regulation valve includes an inflow-side pressure chamber including a liquid inflow hole, an outflow-side pressure chamber including a liquid outflow hole, a communication hole, and a valve member inserted in the communication hole and movable, in accordance with change of pressure inside the outflow-side pressure chamber, to a closing position for closing the communication hole and an opening position for opening the communication hole. The outflow-side pressure chamber includes, as the liquid outflow hole, a first outflow hole formed below the communication hole and a second outflow hole formed above the communication hole. As seen from a communication direction of the communication hole, a first line extending in an outflow direction of liquid from the first outflow hole and a second line extending in an outflow direction of liquid from the second outflow hole do not coincide with each other.

Abstract: A gas component detection device includes a column, a sensor, a flow path, and a flow path switch. The column separates a component of gas to be detected. The sensor is, for example, a semiconductor sensor, is connected to the downstream side of the column, and detects a component of gas to be detected. The flow path connects the column and the sensor. The flow path switch is arranged between a flow path and a flow path. The flow path switch switches between and executes a measurement mode in which gas to be detected discharged from the column flows into the sensor, and a discharge mode in which gas to be detected discharged from the column is discharged to the outside.

Abstract: A degassing device removes air dissolved in a liquid under a pressure decreased atmosphere, and includes one or more liquid tanks, a pressure decreasing device, and an inflow pass. One or more liquid tanks store the liquid. The pressure decreasing device decreases pressure in the liquid tank. The inflow pass allows the liquid to be flowed into the liquid tank due to a negative pressure in the pressure decreased liquid tank.

Abstract: A degassing device removes air dissolved in a liquid under a pressure decreased atmosphere, includes a liquid tank, a pressure decreasing device, a circulation flow pass, a circulation device, a dissolved gas amount measuring device, and a control device. The liquid tank stores the liquid. The pressure decreasing device decreases pressure in the liquid tank. The circulation flow pass communicates different positions of the liquid tank. The circulation device circulates the liquid through the circulation flow pass. The dissolved gas amount measuring device measures an amount of dissolved gas of the liquid in the liquid tank. The control device controls the circulation device in accordance with the amount of dissolved gas measured by the dissolved gas amount measuring device.

Abstract: A degassing device removes air dissolved in a liquid under a pressure decreased atmosphere, and includes a liquid tank, a pressure decreasing device, a circulation flow pass, a circulation device, and a variable mechanism. The liquid tank stores the liquid. The pressure decreasing device decreases pressure in the liquid tank. The circulation flow pass communicates different positions of the liquid tank. The circulation device circulates the liquid through the circulation flow pass. The variable mechanism changes a height of an inlet port from the circulation flow pass to the liquid tank in accordance with a height of a liquid surface in the liquid tank.

Abstract: A degassing device removes air dissolved in a liquid under a pressure decreased atmosphere, and includes a liquid tank, a circulation flow pass, a circulating device, a container, and a pressure decreasing device. The liquid tank stores the liquid. The circulation flow pass communicates different positions of the liquid tank. The circulation device circulates the liquid through the circulation flow pass. The container houses the circulation device. The pressure decreasing device decreases pressure in the liquid tank and the container.

Abstract: An image forming apparatus includes a light scanning device, a developing portion, a control portion and a storage portion. An evaluation chart includes a first evaluation pattern and a second evaluation pattern. The first evaluation pattern includes a first patch row. The first patch row is formed by arranging a plurality of first evaluation patches. The first evaluation patch includes a first dot row and a second dot row. The second evaluation pattern includes a second patch row. The second patch row is formed by arranging a plurality of second evaluation patches.

Abstract: An image forming apparatus includes a light scanning device, a developing portion, a control portion and a storage portion. The storage portion stores an evaluation chart. The evaluation chart includes a first evaluation pattern and a second evaluation pattern. The first evaluation pattern includes a first patch row. The first patch row is formed by arranging a plurality of first evaluation patches. The first evaluation patch includes a first dot row and a second dot row. The second evaluation pattern includes a second patch row. The second patch row is formed by arranging a plurality of second evaluation patches.

Abstract: An image forming apparatus includes a light scanning device, a developing portion, a control portion and a storage portion. The storage portion stores an evaluation chart. The evaluation chart includes a first evaluation pattern and a second evaluation pattern. The first evaluation pattern includes a first patch row. The first patch row is formed by arranging a plurality of first evaluation patches. The first evaluation patch includes a first dot row, a second dot row and an auxiliary dot row. The second evaluation pattern includes a second patch row. The second patch row is formed by arranging a plurality of second evaluation patches.

Abstract: An image forming apparatus includes a light scanning device, a developing portion, a control portion and a storage portion. An evaluation chart includes a first evaluation pattern, a second evaluation pattern, a third evaluation pattern and a fourth evaluation pattern. The first evaluation pattern includes a first dot row and a second dot row, and the third evaluation pattern includes a fifth dot row and a sixth dot row. The fourth evaluation pattern is formed by arranging a plurality of fourth evaluation patches. The fourth evaluation patch includes a seventh dot row and an eighth dot row.

Abstract: An image forming apparatus includes a light scanning device, a developing portion, a control portion and a storage portion. The storage portion stores an evaluation chart. The evaluation chart includes a first evaluation pattern and a second evaluation pattern. The first evaluation pattern includes a first patch row. The first patch row is formed by arranging a plurality of first evaluation patches. The first evaluation patch includes a first dot row, a second dot row and an auxiliary dot row. The second evaluation pattern includes a second patch row. The second patch row is formed by arranging a plurality of second evaluation patches.