Crystal oscillator

• US 20050088251A1
• Filed: 10/21/2004
• Published: 04/28/2005
• Est. Priority Date: 10/23/2003
• Status: Active Grant

• Current Assignee: Nihon Dempa Kogyo Company Limited
• Original Assignee: Nihon Dempa Kogyo Company Limited
• Inventors: Matsumoto, Takashi
• Granted Patent: US 7,116,179 B2
• Time in Patent Office: Days
• US Class Current: 331/158
• CPC Class Codes: H03B 5/32 being a piezoelectric resonator selection of piezoelectric material H10N30/00
• CPC Class Codes: H05K 2201/09181 Notches in edge pads
• CPC Class Codes: H05K 2201/09936 Marks, inscriptions, etc. for information
• CPC Class Codes: H05K 2201/10371 Shields or metal cases
• CPC Class Codes: H05K 2203/167 Using mechanical means for positioning, alignment or registration, e.g. using rod-in-hole alignment
• CPC Class Codes: H05K 2203/168 Wrong mounting prevention
• CPC Class Codes: H05K 3/3405 Edge mounted components, e.g. terminals

Abstract

A crystal oscillator comprises a rectangular circuit substrate for mounting circuit devices and its metal cover, said circuit substrate has grooves on each long side and on each short side and said metal cover has projections at each aperture end corresponding to the grooves, and which has a swelling from external to internal in each of the projections, wherein both the grooves provided on each short side and the projection of said metal cover are provided at one end of each long side or each short side.

Claims

1. A crystal oscillator which comprises a rectangular circuit substrate for mounting circuit devices and its metal cover, said circuit substrate has grooves on each long side and on each short side, and said metal cover has projections at each aperture end corresponding to the grooves, and which has a swelling from external to internal in each of the projections, wherein

both the grooves provided on each long side and the projection of said metal cover are provided at one end of each long side or each short side.

2. The crystal oscillator according to claim 1, wherein

each grooves is shaped in a katakana character when viewed from top.