Patent ID: 8905290

Claim:
An apparatus for mounting semiconductor chips on a circuit board, comprising: a loading unit loading at least a circuit board and at least a plurality of semiconductor chips into the apparatus, the circuit board having an inner circuit pattern and a plurality of contact pads connected to the inner circuit pattern and the semiconductor chip having a plurality of contact terminals; a combining unit positioning the semiconductor chip onto a respective mounting area of the circuit board and combining the contact terminal of the semiconductor chip with the contact pad of the circuit board by using flux, the combining unit having a flux coater for coating the contact terminal with the flux and a flux controller for automatically supplementing the flux to the flux coater; and a bonding unit bonding the contact terminals of the semiconductor chip to the contact pads of the circuit board using a heat treatment, wherein the flux coater comprises: a body having a coating bath filled up with the flux that is coated on the contact terminals; and a flux tank holding the flux and moving across the coating bath between first and second standby areas of the body while supplying the flux to the coating bath, wherein the flux controller comprises: a level sensor over the flux tank adjacent to at least one of the first and second standby areas of the body detecting a flux level of flux residuals remaining in the flux tank as a first signal, and wherein the level sensor comprises: a detection section generating ultrasonic waves and detecting reflective ultrasonic waves reflected from an inside of the flux tank; a head section controlling the detection section; a guide section protruding from the head section in a direction along which the ultrasonic waves are sent thereby guiding the ultrasonic waves in the flux tank; and a supplementary plate positioned over the flux tank and at least one supplementary guide section penetrating through the supplementary plate, the supplementary guide section being connected with the guide section and guiding the ultrasonic waves to various areas in the flux tank.