LIQUID DROPLET FORMING APPARATUS

PURPOSE:To enhance the quality of a product by holding the dripping speed at a constant liquid droplet forming position, by detecting a state from the start of the dripping of a solution to the adhesion of said solution to an object in timing made synchronous to a period of vibration and adjusting the pressurizing degree to the dripping solution and vibration amplitude. CONSTITUTION:In a liquid droplet forming apparatus used in an ink jet type printer or a cell sorter, a solution 4 is injected in a nozzle 1 under the pressure preset by a liquid pressurizing part 5 and dripped from the nozzle 1 as a liquid droplet by a vibrator 2 vibrated at the cycle of the clock signal CLK from an exciting part 7. The interval of the liquid droplet is synchronous to a period of vibration and the image of the solution dripped is picked up in a stationary state in synchronous relation to the on-and-off of an LED array 9 and guided to a detector 11 by a light receiving part optical system 10 and the dripping time of the liquid droplet is calculated by data processing. When this dripping state varies, a control judge part 12 controls the exciting part and a pressure control part 6 corresponding to a variation value.