Abstract: A method of driving a droplet jetting head comprising nozzle orifices to jet droplets, pressure generating chambers each of which can store liquid and communicate with one of the orifices, and pressurizing devices to change the pressures of the pressure generating chambers, comprising the steps of increasing the pressure in the pressure generating chamber by the pressurizing device and protruding liquid in the pressure generating chamber from the nozzle orifice as a droplet, and separating the liquid which protrudes from the nozzle orifice when ?/? is equal to or less than 1/3 where ?(?m) is the diameter (in micrometers) of an liquid pillar (protruded from the nozzle orifice) at the front end of the nozzle orifice and ?(?m) is the maximum diameter (in micrometers) of the liquid pillar.

Abstract: A method of driving a droplet jetting head comprising nozzle orifices to jet droplets, pressure generating chambers each of which can store liquid and communicate with one of the orifices, and pressurizing devices to change the pressures of the pressure generating chambers, comprising the steps of increasing the pressure in the pressure generating chamber by the pressurizing device and protruding liquid in the pressure generating chamber from the nozzle orifice as a droplet, and separating the liquid which protrudes from the nozzle orifice when ?/? is equal to or less than 1/3 where ?(?m) is the diameter (in micrometers) of an liquid pillar (protruded from the nozzle orifice) at the front end of the nozzle orifice and ?(?m) is the maximum diameter (in micrometers) of the liquid pillar.

Abstract: A method of manufacturing a color filter having a substrate comprising black matrix sections and image forming sections, comprises a step of applying a treatment onto the substrate so as to provide influence to a contact angle between an ink meniscus and the black matrix sections before applying an ink onto the substrate.

Abstract: A magnetic recording medium comprising a support and provided thereon a magnetic layer containing magnetic powder and a copolymer capable of being soluble in water by 10 parts by weight or more per 100 parts by weight of water.Further, a process of preparing a magnetic recording medium wherein magnetic powder is treated with a copolymer capable of dissolving 10 parts by weight or more per 100 parts by weight of water in an aqueous medium under presence of a metal ion and a magnetic paint containing this treated magnetic powder is coated on base to form a magnetic layer is also provided.