SCREEN PRINTING APPARATUS, RESISTANCE ELEMENT SUBSTRATE MANUFACTURED USING THE SAME AND VARIABLE RESISTOR USING RESISTANCE ELEMENT SUBSTRATE

摘要

PROBLEM TO BE SOLVED: To manufacture a resistance element substrate gently changed in the resistance value characteristics of the inflection part thereof by the reduced number of times of printing in a screen printing apparatus for forming a printing film on the upper surface of a member to be printed. SOLUTION: A screen mask, of which the image pattern 31 is constituted of principal aperture regions 32 and auxiliary aperture regions 33, is used and the dot-like films 49B of resistance parts 42 arranged at a constant interval in a respectively independent state are printed and formed simultaneously with rectangular films 44A in aglignment with the inflection part by the auxiliary aperture regions 33. By this constitution, the resistance element substrate gently changed in the resistance value characteristics in the vicinity of the inflection part can be obtained by the reduced number of times of printing.