FOREIGN MATERIAL DETECTING APPARATUS, FOREIGN MATERIAL DETECTING METHOD, LIQUID DROPLET DISCHARGING APPARATUS, AND LIQUID DROPLET DISCHARGING METHOD

摘要

embodiment of the apparatus for detecting foreign objects , signal generator , transmitter , receiver , and information to save you and a storage unit and detection unit. The signal generating unit to generate an electrical signal . The calling unit , converting the electrical signal to generate a pressure wave in the liquid . The receiving unit receives a reflected wave from the liquid , and converted into an electrical signal . The storage unit stores information about the status that do not contain a foreign matter in the liquid . The detector , the reflected wave and the electric signal , converts the detection and at least one of a presence and size of the foreign matter in the foreign matter on the basis of the difference between the electric signal based on the stored information . ;