FLAT PACKAGE TYPE CRYSTAL OSCILLATOR

PURPOSE:To produce a flat package type crystal oscillator of an extremely small thickness at a low cost, by attaching containers formed by giving an etching process to a metallic thin plate at the upper and lower parts of a tuning fork type crystal bar with a frame and then forming arms by extending an electrode lead to the containers. CONSTITUTION:A metallic vapor deposition film 23 extended from an exciting electrode is formed at a frame part 22 formed in a body with a tuning fork type crystal bar 21. The 1st and 2nd containers 24 and 25 which are sealed under vacuum are made of a metallic thin plate respectively. The 1st and 2nd arms 26 and 27 which are used to electrode leads are formed in a body from an end of the containers respectively. The solder platings 28 and 29 are applied to the areas where a joint is secured with a frame part 22 of the oscillator bar of the containers 24 and 25 respectively. A material which is not wet with the solder is patterned at other areas. The bar 21 is piled on the containers 24 and 25 within a vacuum device, and the solders 28 and 29 are fused with a infrared ray heater, etc. and then stuck to each other. Thus a flat package type crystal oscillator is obtained. With such a crystal oscillator, the generation of cracks is reduced since the containers 24 and 25 are made of a metal, and furthermore the working efficiency is improved for the packaging process to a circuit owing to the arms 26 and 27.