Droplet discharging method and droplet discharging apparatus

A droplet discharging method comprising:

• alternately repeating a droplet discharging operation of discharging droplets onto a medium by using a first head and a second head that move in an X direction or in a −X direction and a medium moving operation of moving the medium in a Y direction intersecting the X direction to form a plurality of dots on the medium,
• wherein, in a case where all the dots are formed at all the positions on the medium, where the dots can be formed, by using the first head and the second head,
• a first region which is formed of a plurality of the dots formed by using the first head and the second head so that, when a ratio of the number of dots formed by using the second head to the sum of the number of dots formed by using the first head and the number of dots formed by using the second head is referred to as a second head use ratio in rows of the dots which are lined up in the X direction, the second head use ratio is constant, a second region which is positioned in a −Y direction from the first region to be connected to the first region and is formed of a plurality of the dots formed by using the first head and the second head to cause the second head use ratio to be increased from a value less than 70% to a value greater than 80% in the −Y direction, and a third region which is formed of a plurality of the dots formed by using the second head are formed.

A droplet discharging apparatus comprising:

• a first head and a second head which form dots by discharging droplets onto a medium;
• a scanning moving unit which moves the first head and the second head in ±X directions on the medium;
• a medium moving unit which moves the medium in a Y direction intersecting the X direction;
• and
• a control unit which performs control of driving of the scanning moving unit and the medium moving unit and control discharging of the droplets from the first head and the second head,
• wherein the control unit alternately repeats a droplet discharging operation of discharging the droplets onto the medium by using the first head and the second head that are moved by the scanning moving unit in the X direction or in the −X direction and a medium moving operation of moving the medium by the medium moving unit in the Y direction intersecting the X direction to form the dots on a first region by using the first head and the second head so that, when a ratio of the number of dots formed by using the second head to the sum of the number of dots formed by using the first head and the number of dots formed by using the second head is referred to as a second head use ratio in rows of the dots which are lined up in the X direction, the second head use ratio is constant, to form the dots on a second region which is positioned in a −Y direction from the first region to be connected to the first region by using the first head and the second head so that the second head use ratio is increased from a value less than a first set value to a value greater than a second set value greater than the first set value in the −Y direction in a plurality of rows of the dots lined up in the X direction, and to form the dots on a third region which is positioned in the −Y direction from the second region to be connected to the second region by using the second head.