Abstract: The specification discloses an ink container having a pressure stabilizer module. The module contains an airtight membrane, a passive plate, and an elastic device. The airtight membrane separates a box into an ink chamber and an air chamber. The passive plate is connected to one side of the airtight membrane and to the elastic device. The elastic device is normally depressed or stretched to move the airtight membrane. The ink chamber is thus slightly extended outward and maintains a negative pressure. As the ink stored inside the ink chamber gets less, the elastic device provides a restoring force to push or drag the passive plate. The negative pressure is thus maintained within a specific range. The invention further uses a conic spiral spring to avoid ink waste.

Abstract: A back pressure regulator for ink-jet pen, using a cover element and recess in the pen to form a specific gap, to constantly maintains a quantity of ink to form a liquid-air interface, to prevent excess air freely to flow into the ink-jet pen, so as to act as a pressure regulator. The ink-jet pen has an orifice providing a passage in the recess for ambient air to bubble into, to prevent the back pressure from rising above a level that would cause malfunction of the pen. The recess includes at least two grooves which starts from the orifice, and provides a diversity of grooves in opposite or different directions. The grooves further having an inclined or curved bottom surface to define a gap between the cover element and the bottom surface thereof. The gap between the cover element and recess is smallest near the orifice and increases as the distance from the orifice increases.

Abstract: The specification discloses an ink container having a pressure stabilizer module. The module contains an airtight membrane, a passive plate, and an elastic device. The airtight membrane separates a box into an ink chamber and an air chamber. The passive plate is connected to one side of the airtight membrane and to the elastic device. The elastic device is normally depressed or stretched to move the airtight membrane. The ink chamber is thus slightly extended outward and maintains a negative pressure. As the ink stored inside the ink chamber gets less, the elastic device provides a restoring force to push or drag the passive plate. The negative pressure is thus maintained within a specific range. The invention further uses a conic spiral spring to avoid ink waste.