Patent Number: 
Section: claims

1. A method of producing a single particle film etching mask comprising:a drip step in which a dispersed liquid in which particles dispersed in a solvent are dripped onto a liquid surface of a water tank;a single particle film formation step in which an ultrasonic sound irradiates from a substratum water of the water tank to the liquid surface of the water tank, and a single particle film including particles obtained by volatizing the solvent is formed; anda transcription step in which the single particle film is transcribed to a substrate,wherein an ultrasonic frequency of the ultrasonic sound is 700 kHz to 2 MHz. 2. A method of producing a micro structure comprising:a drip step in which a dispersed liquid in which particles dispersed in a solvent are dripped onto a liquid surface of a water tank;a single particle film formation step in which an ultrasonic sound irradiates from a substratum water of the water tank to the liquid surface of the water tank, and a single particle film including of particles obtained by volatizing the solvent is formed;a transcription step in which the single particle film is transcribed to a substrate; andan etching step in which the substrate is etched with gas-phase etching using the single particle film as an etching mask,wherein an ultrasonic frequency of the ultrasonic sound is 700 kHz to 2 MHz.