EP0092427A2
Expired / Lapsed
EP
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Piezoelectric resonator chip and a method for adjusting its resonant frequency
Assignee: Fujitsu Ltd
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Filing: 1983-04-19
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Granted: —
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Expires: 2003-04-19
Abstract
Abstract A piezoelectric resonator chip 1 comprising a piezoelectric chip plate 2 and a pair of electrode patterns 3 and 4 formed on opposite surfaces of it has its resonant frequency adjusted by removing part 9 of the electrodes 3 and 4 using a laser beam. The electrode pattern may include an adjuster pattern (Figure 4) comprising a narrow cutting portion 19, 30 and a separation pattern 21, 22 which is connected to the remainder of the electrode pattern 15, 16 by the cutting portion 19, 30.
Inventors
- 👤 Yoshiro Fujiwara
- 👤 Yuji Kojima
- 👤 Sumio C/O Fujitsu-Meiwa-Ryo Yamada
- 👤 Hiroshi Hoshino
- 👤 Noboru Wakatsuki
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-30 21:28
CPC Classifications
H; H03; H03H; H03H9/00; H03H9/15; H03H9/17; H03H9/177; H03H3/00; H03H3/007; H03H3/02; H03H3/04; H03H9/02; H03H9/125; H03H9/13; H03H9/132
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
76 words
A method of adjusting the resonance frequency of a piezoelectric resonator chip (1) which comprises a piezoelectric chip plate (2) and a pair of electrodes (3 and 4) formed on opposite surfaces of the piezoelectric chip plate (2), the method comprising adjusting the length of the electrodes (3 and 4) by removing portions (9) of the electrodes (3 and 4) using a laser beam, thereby to adjust the resonance frequency of the piezoelectric resonator chip (1).
Claim 2
Independent Claim
76 words
A method of adjusting the resonance frequency of a piezoelectric resonator chip (1) which comprises a piezoelectric chip plate (2) and a pair of electrodes (3 and 4) formed on opposite surfaces of the piezoelectric chip plate (2), the method comprising adjusting the length of the electrodes (3 and 4) by removing portions (9) of the electrodes (3 and 4) using a laser beam, thereby to adjust the resonance frequency of the piezoelectric resonator chip (1).
Claim 3
Dependent Claim
87 words
A method of adjusting the resonant frequency according to claim 2, in which at least one of the electrodes includes an adjuster pattern comprising at least one portion (21) connected to the remainder (15) of the electrode (13, 14) by a narrow cutting portion (19) and in which the resonant frequency of the resonator chip (11) is adjusted by cutting the narrow cutting portion (19) by irradiating it with a laser beam so that the portion (21) is electrically isolated from the remainder (15) of the electrode.
Claim 4
Dependent Claim
46 words
A method according to claim 1 or 2, in which an oscillating electrical signal of a required frequency is applied to the electrodes (3 and 4) and parts of the electrodes (3 and 4) are removed until the resonator chip (1) resonates at the required frequency.
Claim 5
Dependent Claim
87 words
A piezoelectric resonator chip (11) comprising a piezoelectric chip plate (12) and a pair of electrode patterns (13 and 14) formed on opposite surfaces of the piezoelectric chip plate (2), the electrode patterns (13, 14) facing each other through the piezoelectric chip plate (12), characterised in that at least one of the electrode patterns includes an adjuster pattern comprising a narrow cutting portion (19,30) and a separation portion (21, 22) which is connected to the remainder of the electrode pattern (15) by the cutting portion (19, 30).
Claim 6
Dependent Claim
87 words
A piezoelectric resonator chip (11) comprising a piezoelectric chip plate (12) and a pair of electrode patterns (13 and 14) formed on opposite surfaces of the piezoelectric chip plate (2), the electrode patterns (13, 14) facing each other through the piezoelectric chip plate (12), characterised in that at least one of the electrode patterns includes an adjuster pattern comprising a narrow cutting portion (19,30) and a separation portion (21, 22) which is connected to the remainder of the electrode pattern (15) by the cutting portion (19, 30).
Claim 7
Dependent Claim
22 words
A piezoelectric resonator chip according to claim 4, characterised in that the cutting pattern is a pattern cut by laser beam irradiation.
Claim 8
Dependent Claim
50 words
A piezoelectric resonator chip according to claim 4 or 5, in which the electrode patterns (113, Figure 9) comprise a conductive layer (115) and a metal layer (114) having a higher melting point than the conducting layer (115) disposed between the conductive layer (115) and the piezoelectric chip plate (112).
Claim 9
Dependent Claim
35 words
A piezoelectric resonator chip according to claims 4, 5 or 6, in which an anti-reflection layer (126, Figure 11) for preventing reflection of a laser beam is formed on top of the electrode patterns (123).
Claim 10
Dependent Claim
57 words
A piezoelectric resonator chip according to claim 4 or 5, in which the adjuster pattern (331, 332, Figure 16) is directly formed on the piezoelectric chip plate (305) and in which a layer of high melting point metal (321, 322) is disposed between the remainder of the electrode pattern (315, 316) and the piezoelectric chip plate (305).
References Cited (Backward Citations)
No citation records indexed.
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