PROBLEM TO BE SOLVED: To control, for example, a droplet shape by integrating a cooling means for forming a droplet by use of an MEMs (Micro Electro Mechanical System) that controls the temperature of a minute area, or a cooling pattern layer in a predetermined minute area, thereby controlling the cooling means or cooling pattern layer minutely.;SOLUTION: The droplet optical apparatus includes: the cooling means for cooling a droplet formation area where droplets are formed for flocculating a droplet material in atmosphere or sealed space; and a temperature control means for controlling the temperature of the cooling means.;COPYRIGHT: (C)2010,JPO&INPIT
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