Invention Grant
- Patent Title: Tuning fork-type vibrating reed, tuning fork-type vibrator and manufacturing method therefor
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Application No.: US16467272Application Date: 2017-11-01
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Publication No.: US11563413B2Publication Date: 2023-01-24
- Inventor: Hiroaki Yamashita
- Applicant: DAISHINKU CORPORATION
- Applicant Address: JP Kakogawa
- Assignee: DAISHINKU CORPORATION
- Current Assignee: DAISHINKU CORPORATION
- Current Assignee Address: JP Kakogawa
- Agency: Norris McLaughlin, P.A.
- Priority: JPJP2016-249756 20161222
- International Application: PCT/JP2017/039577 WO 20171101
- International Announcement: WO2018/116651 WO 20180628
- Main IPC: H03H3/04
- IPC: H03H3/04 ; H03H9/21 ; H03H3/02
Abstract:
When a thick frequency adjustment metal film of a tuning fork-type vibration piece is irradiated with a beam on a wafer for frequency coarse adjustment, projections are possibly formed on a roughened end of the frequency adjustment metal film. Such projections are pressurized and pushed down not to chip off under any impact, so that the risk of frequency fluctuations is suppressed.
Public/Granted literature
- US20200067485A1 TUNING FORK-TYPE VIBRATING REED, TUNING FORK-TYPE VIBRATOR AND MANUFACTURING METHOD THEREFOR Public/Granted day:2020-02-27
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