PRODUCTION OF CRYSTAL OSCILLATOR

摘要

PURPOSE:To obtain a crystal oscillator having high Q, by applying the screen printing and an etching process to produce a crystal and therefore suppressing the increment of equivalent resistance value due to a holding means of the crystal oscillator. CONSTITUTION:Epoxy resins 1 and 2 are formed by the screen printing for an AT-cut rectangular plate crystal oscillator 10 shown in figure (a). A crystal plate is dipped several hours into a chemical etching solution after the epoxy resins are hardened. Then these epoxy resins are removed to obtain a rectangular crystal oscillator as shown in figure (b). In such a constitution, the oscillation energy can be concentrated to both main sides 3 and 4 of the crystal plate. At the same time, the leakage of oscillation energy can be prevented by level differences 9-12 produced by an etching process. Thus sides 5'-8' have no oscillation. Therefore the equivalent resistance value has no increment although the sides 5'-8' are used as the holding means with use of a conductive adhesive.