Patent ID: 6271657
Filing Date: 2001-08-07
Classification: G01R

Abstract:
A test head positioning apparatus in a semiconductor device testing apparatus of the type in which semiconductor devices are transported to a test section where the semiconductor devices are subjected to testing and after completion of the testing, are carried out of the test section to a predetermined location, wherein said test head positioning apparatus is used to move a test head for applying a test signal having a predetermined pattern to the semiconductor devices vertically upwardly to and downwardly from a predetermined elevation in said test section of the semiconductor device testing apparatus, said test head positioning apparatus comprising:a plurality of counterbalancers having a driving force approximately equivalent to the weight of said test head, wherein said counterbalancers are installed at at least two opposed positions of said test head and the sum of driving forces of these counterbalancers are set at a level approximately equivalent to the weight of said test head; anda hand-operated jack for moving said test head vertically upwardly and downwardly.