Claims
- 1. A method of manufacturing a piezoelectric vibrator, comprising the steps of:
- preparing a first piezoelectric sheet having a first upper surface and a first lower surface;
- preparing a second piezoelectric sheet having a second upper surface and a second lower surface;
- forming first-set elongated electrodes on said first upper surface in parallel;
- forming second-set elongated electrodes on said second upper surface in parallel;
- piling said second piezoelectric sheet on said first piezoelectric sheet with said first upper surface placed adjacent to said second lower surface and with each of said second-set elongated electrodes arranged halfway between two adjacent ones of said first-set elongated electrodes;
- sintering said first and said second piezoelectric sheets on which said first-set and said second-set elongated electrodes are formed; and
- polarizing said second piezoelectric sheet in directions from each of said second-set elongated electrodes to said two adjacent ones of said first-set elongated electrodes.
- 2. A method of manufacturing a piezoelectric vibrator, comprising the steps of:
- preparing a first piezoelectric sheet having a first upper surface and a first lower surface;
- preparing a second piezoelectric sheet having a second upper and a second lower surface;
- forming first-set elongated electrodes on said first upper surface in parallel;
- forming second-set elongated electrodes on said second upper surface in parallel;
- forming third-set elongated electrodes on said first lower surface in parallel with each of said third-set elongated electrodes arranged halfway between two adjacent ones of said first-set elongated electrodes;
- piling said second piezoelectric sheet on said first piezoelectric sheet with said first upper surface placed adjacent to said second lower surface and with each of said second-set elongated electrodes arranged halfway between two adjacent ones of said first-set elongated electrodes;
- sintering said first and said second piezoelectric sheets on which said first-set, said second-set, and said third-set elongated electrodes are formed;
- polarizing said first piezoelectric sheet in directions from each of said third-set elongated electrodes to said two adjacent ones of said first-set elongated electrodes; and
- polarizing said second piezoelectric sheet in directions from each of said second-set elongated electrodes to said two adjacent ones of said first-set elongated electrodes.
Priority Claims (3)
Number |
Date |
Country |
Kind |
3-271913 |
Sep 1991 |
JPX |
|
3-288489 |
Nov 1991 |
JPX |
|
4-25093 |
Feb 1992 |
JPX |
|
Parent Case Info
This is a division of application Ser. No. 07/946,946, filed Sep. 17, 1992, now U.S. Pat. No. 5,315,205, issued May 24, 1994.
US Referenced Citations (5)
Foreign Referenced Citations (7)
Number |
Date |
Country |
0408305A2 |
Jan 1991 |
EPX |
144793 |
Mar 1963 |
DEX |
1144793 |
Mar 1963 |
DEX |
0072171 |
Apr 1988 |
JPX |
63-72171 |
Apr 1988 |
JPX |
63-72172 |
Apr 1988 |
JPX |
0072172 |
Apr 1988 |
JPX |
Non-Patent Literature Citations (3)
Entry |
Patent Abstracts of Japan, vol. 15, No. 277 (E-1089), Jul. 15, 1991 & JP-A-30 94 487 (Murata Mfg. Co., Ltd.) Apr. 19, 1991. |
Patent Abstracts Of Japan, vol. 12, No. 304 (E-646), Aug. 18, 1988 & JP-A-63 072 172 (NGK Spark Plug Co.). |
Patent Abstracts Of Japan, vol. 12, No. 304 (E-646), Aug. 18, 1988 & JP-A-63 072 171 (NGK Spark Plug Co.) Apr., 1988. |
Divisions (1)
|
Number |
Date |
Country |
Parent |
946946 |
Sep 1992 |
|