Crystal device
AssigneeNihon Dempa Kogyo Co., Ltd.
InventorRyoichi Ichikawa
Life of this patent
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Abstract
An object is to provide a crystal device that uses a mesa-structure crystal piece in which frequency adjustment is possible. A configuration is such that in a crystal device having: a crystal piece having a thick portion and a thin portion, with an excitation electrode formed on both main faces of the thick portion, and a lead out electrode electrically connected to the excitation electrode, formed on an end portion; a container main body having a concavity for accommodating the crystal piece; and a cover that is connected to an open end face of the container main body and hermetically seals the crystal piece, a frequency adjustment metal film which is electrically isolated from the excitation electrode and made independent, is formed on the thin portion of the crystal piece.
Claims7
A crystal device having:
- a crystal piece having a thick portion and a thin portion, with an excitation electrode formed on both main faces of said thick portion, and a lead out electrode electrically connected to said excitation electrode, formed on an end portion;
- a container main body having a concavity for accommodating said crystal piece;
- and
- a cover that is connected to an open end face of said container main body and hermetically seals said crystal piece, wherein
- a frequency adjustment metal film which is electrically isolated from said excitation electrode and made independent, is formed on said thin portion of said crystal piece.
A crystal device comprising:
- a base with a crystal retention terminal formed on an upper face, and a mount terminal that is electrically connected to said crystal retention terminal formed on an outer bottom face;
- a crystal piece mounted on said base, with an excitation electrode formed on both main faces, and with a support electrode that is electrically connect to an excitation electrode using a connection electrode formed on both sides of one end portion, and with said support electrode bonded to said crystal retention terminal with an electroconductive adhesive;
- and
- a lid that is connected to an outer edge face of said base, and that has a concavity in which said crystal piece is hermetically sealed, wherein
- said crystal piece has a thick portion and a thin portion, and an excitation electrode is formed on both main faces of said thick portion, and a lead out electrode that is electrically connected to said excitation electrode is formed on an end portion,
- and a frequency adjustment metal film which is electrically isolated from said excitation electrode and made independent, is formed on said thin portion of said crystal piece.
A crystal device comprising:
- a base having a concavity in an upper face, and with a crystal retention terminal formed on an inner bottom face of said concavity, and a mount terminal that is electrically connected to said crystal retention terminal formed on an outer bottom face;
- a crystal piece accommodated in said concavity, with an excitation electrode formed on both main faces, and with a support electrode that is electrically connect to an excitation electrode using a connection electrode formed on both sides of one end portion, and with said support electrode bonded to said crystal retention terminal with an electroconductive adhesive;
- and
- a cover that is connected to an outer edge face of said base, and that hermetically seals said crystal piece, wherein
- said crystal piece has a thick portion and a thin portion, and an excitation electrode is formed on both main faces of said thick portion, and a lead out electrode that is electrically connected to said excitation electrode is formed on an end portion,
- and a frequency adjustment metal film which is electrically isolated from said excitation electrode and made independent, is formed on said thin portion of said crystal piece.
A crystal device having:
- a crystal substrate, in which a vibration portion with an excitation electrode formed on both main faces, and a frame portion that surrounds said vibration portion, are integrally formed;
- a lid connected to an upper face of said frame portion;
- and
- a base connected to a lower face of said frame portion,
- and in which said vibration portion is hermetically sealed by said frame portion, said lid, and said base, wherein
- said vibration portion has a thick portion and a thin portion, and said excitation electrode is formed on both main faces of said thick portion,
- and a frequency adjustment metal film which is electrically isolated from said excitation electrode and made independent, is formed on said thin portion of said vibration portion.
Dependencies are inferred from the claim text.