Electronic device, electronic apparatus, and moving object
US-2015349746-A1 · Dec 3, 2015 · US
Tuning-fork type quartz-crystal vibrating pieces and piezoelectric devices having low crystal impedance
US8928207B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-8928207-B2 |
| Application number | US-201213422913-A |
| Country | US |
| Kind code | B2 |
| Filing date | Mar 16, 2012 |
| Priority date | Mar 29, 2011 |
| Publication date | Jan 6, 2015 |
| Grant date | Jan 6, 2015 |
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- Title
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Abstract
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Tuning-fork type quartz-crystal vibrating pieces are disclosed, of which the vibration frequency can be adjusted without increasing CI. An exemplary piezoelectric device has a pair of vibrating arms extending in a predetermined direction from a first edge of a base. Respective first grooves are defined in a first principal surface of the vibrating arms. The first grooves extend in the predetermined direction, and have first excitation electrodes extending from a back-edge surface but not completely to a front-edge surface of the grooves. Respective second grooves are defined in a second principal surface, opposite the first principal surface, of the vibrating arms. The second grooves extend in the predetermined direction, and have second excitation electrodes extending from a back-edge surface completely to a front-edge surface of the second grooves.
First claim
Opening claim text (preview).
What is claimed is: 1. A tuning-fork type quartz-crystal vibrating piece, comprising: first and second vibrating arms extending from a first edge of a base in a predetermined direction and having respective weights on distal tips thereof; respective first grooves defined on first principal surfaces of the vibrating arms, the first grooves being respective recesses extending in the predetermined direction and extending depthwise from the respective first principal surfaces; and…
Assignees
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Classifications
Electricity · mapped topic
Electricity · mapped topic
- H03H9/21Primary
Electricity · mapped topic
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Frequently asked questions
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- What does patent US8928207B2 cover?
- Tuning-fork type quartz-crystal vibrating pieces are disclosed, of which the vibration frequency can be adjusted without increasing CI. An exemplary piezoelectric device has a pair of vibrating arms extending in a predetermined direction from a first edge of a base. Respective first grooves are defined in a first principal surface of the vibrating arms. The first grooves extend in the predeterm…
- Who is the assignee on this patent?
- Kawanishi Shingo, Nihon Dempa Kogyo Co
- What technology area does this patent fall under?
- Primary CPC classification H03H9/21. Mapped technology areas include Electricity.
- When was this patent published?
- Publication date Tue Jan 06 2015 00:00:00 GMT+0000 (Coordinated Universal Time) (B2). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 8 related publications on this page (citations in our corpus or others sharing the same primary CPC).