CA1196069A - Piezoelectric resonator - Google Patents
Piezoelectric resonatorInfo
- Publication number
- CA1196069A CA1196069A CA000432099A CA432099A CA1196069A CA 1196069 A CA1196069 A CA 1196069A CA 000432099 A CA000432099 A CA 000432099A CA 432099 A CA432099 A CA 432099A CA 1196069 A CA1196069 A CA 1196069A
- Authority
- CA
- Canada
- Prior art keywords
- ceramic substrate
- piezoelectric ceramic
- piezoelectric
- groove
- main electrode
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Abstract
ABSTRACT OF THE DISCLOSURE
This disclosure is directed to an improved strip type or rectangular type piezoelectric resonator utilizing length mode vibration, which includes a piezoelectric ceramic substrate, and first and second main electrode faces formed on opposite surfaces of the piezoelectric ceramic substrate, and which is characterized in that there is further provided a groove formed in one of the first and second main electrode faces so as to extend over an entire length of the piezoelectric ceramic substrate in a direction parallel to its longitudinal direction, and at a position deviated from a center in a widthwise direction of the piezoelectric ceramic substrate by more than 2% of the width of the piezoelectric ceramic substrate.
This disclosure is directed to an improved strip type or rectangular type piezoelectric resonator utilizing length mode vibration, which includes a piezoelectric ceramic substrate, and first and second main electrode faces formed on opposite surfaces of the piezoelectric ceramic substrate, and which is characterized in that there is further provided a groove formed in one of the first and second main electrode faces so as to extend over an entire length of the piezoelectric ceramic substrate in a direction parallel to its longitudinal direction, and at a position deviated from a center in a widthwise direction of the piezoelectric ceramic substrate by more than 2% of the width of the piezoelectric ceramic substrate.
Description
3~
02 _C GROUND OF THE INVENTION
03 The present invention generally relates 04 to a piezoelectric resonator and more particularly, 05 to an improved strip type or rectangular type 06 piezoelectric resona-tor for use, for example, in 07 oscillators, electr:ical Eilters and -the like.
08 Wi.th -the recent progre~s in the Eield of 09 in-tegrated circuits, inexpens:ive ceramic resonators have been widely utilized for the actual 11 applications, and normally, disc type or rectangular 12 plate type piezoelectric reso:nators are generally 13 employed ~or the purpose in a rang~ of resonance 14 frequencies Erom 100 KHZ up to 1 MHZ so as to utilize the expansion mode of vibration thereof.
16 _RIEF_DESCRIPTION OF THE DRAWINGS
17 Objects and features of the present 18 invention will become apparent from the following 19 description taken in conjunction with the preferred embodiment thereof with reference to the 21 accompanying drawings, in which:
22 Figure 1 is a perspective view showing a 23 construction of a conventional rectangular plate 24 type piezoelectric resonator (already referred to), Figure 2 is a perspective view showing a 26 construction of a conventional strip type 27 piezoelectric resonator (already referred to), 28 Figure 3 is a perspective view showing a 29 strip type piezoelectric resonator according to one preferred embodiment of the present invention, 31 Figure 4 is a graph showing a state of 32 resonance in the strip type piezoelectric resonator 33 according to the present invention, and 34 Figure 5 is a graph showing variations in the characteristics of the strip type 36 piezo~lectric resonator according to the present 37 invent.ion when position of the groove is altered.
~",~ 3~
01 ~ 2 -02 As shown in Figure L, the known 03 rec-tangular plate type piezoelec-tric resonator 04 reerred to above includes, for example, a 05 piezoelectric ceramic substrate 1, main electrode 06 faces 2 and 3 Eormed on -the opposite surEaces of 07 sald p:iezoelectric ceramic substra-te 1, and lead 08 wires 4 respectively connected to said main 09 electrode faces 2 and 3. However, in the rectangular plate type piezoelectric resonator as 11 described above or di5c type piezoelectric resona-tor 12 conventionally employed, there have been such 13 disadvan-tages that they are generally large in s:ize, 14 and moreover, tend to produce spurious waves due to thickness mode vibrakion based on -the fundamental 16 wave.
17 Meanwhile, as shown in Figure 2, there 18 has also been conventionally available a strip type 19 piezoelectric resonator utili~ing length mode vibration based on the fundamental wave, and having 21 a construction generally similar to that of the 22 rectangular plate type piezoelectric resonator in 23 Figure 1 as represented by like re~erence 24 numerals. Although advan~ageous in that the dimensions are reduced as compared with the 26 rectangular plate type or disc type piezoelec~ric 27 resonator, the conventional strip type pieæoelectric 28 resona~or as described above still has disadvantages 29 in that undesirable spurious responses due to wid-th mode vibration and thickness mode vibration tend to 31 be produced.
32 SUMMARY OF THE I~VENTIO
33 Accordingly, an essential object of the 34 present invention is to provide an improved strip type piezoelectric resonator in which undesirable 36 spurious responses due to width mode vibration and 37 thickn~ss mode vibration are suppressed by forming a ,, ~,~.
,1"~
3~
01 ~ 3 ~
02 groove on one of oppos.ite main elec-trode faces of 03 the resonator, in a direc-t:ion parallel to the 04 longi-tudinal direction thereof and at a posi-tion 05 deviated from a center in a widthwise direction oE a 06 piezoelectric ceramic substrate, wi-th substantial 07 elimination of disadvantages inherent in the 08 conventional piezoelectric resonators of this kind.
09 Another important object of the pre~ent invention is to provide a strip type piezoelec-tric 11 resonator of -~he above described type, which is 12 simple in construction and stable in functioniny a~
13 high reliability, and can be readily manufactured on 14 a large scale at low cost.
In accomplishing these and other 16 objects, according to one preferred embodiment of 17 the present invention, there is provided a strip 18 type piezoelectric resonator utilizing length mode 19 vibra~ion, which includes a piezoelectric ceramic substrate, and first and second main electrode faces 21 formed on opposite surEaces of ~he piezoelectric 22 ceramic substrate, and is characterized in that 23 there is further provided a groove which i5 formed 24 in one of the first and second main electrode faces so as to extend over an entire length of the 26 piezoelectric ceramic substrate in a direction 27 parallel to the longitudinal direction thereof, and 28 at a position deviated from a center in a widthwise 29 direction of the piezoelectric ceramic substrate by more than 2~ of the width of said piezoelectric 31 ceramic substrate.
32 By arrangement according to the present 33 invention as described above, an improved strip type 34 piezoelectric resonator with suppressed spurious responses has been advantageously presented through 36 simple constructionO
01 - ~ -02 BeEore the description of the pre~en-t 03 invention proceeds, it is to be noted tha-t like 04 parts are designated by like reference numeral~
05 throughout the accompanying drawings.
06 ReEerring now to ~he drawings, -there is 07 shown in Figure 3 a str.ip type piezoelectric 0~ resonator according to one preferred embodiment of 09 the present invention, w~ich generally includes a piezoelectric ceramic substrate 10, and 6~
upper and lower main electrode faces lOA and los formed on opposite surface& of the substrate 10. In one surface of the piezoelectric ceramic substrate 10 at the side of the upper main electrode face lOA, there is formed a groove 11 which extends ovex an entire lenyth of the substrate 10 in a direction parallal to the longitudinal direction of said substrate 10 and is located at a position deviated, at its center line in a widthwise direction thereof, from a center line in the widthwise direction of the upper main electrode face lOA or the substrate 10 as illustrated. By the above groove 11, the upper main electrode face lOA of the substrate 10 is divided into a large region ]2 and a small region 13, while the lower main electrode face lOB is formed on the other entire surface of the substr~te 10 in the similar manner as in the conventional arrangement of Figs. 1 or 2.
More specifically, by way of example, the piezoelectric ceramic substrate 10 is set in dimensions to be 4.65 mm in length, 0.8 mm in width W, and 0.3 rnm in thickness, and the groove 11 has a width of 0.15 mm and a depth of 0.15 mm, while a distance through which the groove 11 i5 deviated from the center in the widthwise direction of the pie~oelectric cerarnic substrate 10, i.e. a distance S
from the center of the substrate 10 in its widthwise direction to the center of said groove 11 in the widtilwise direction thereof is set to be 0.1 mm, and the oscillation 3~
frequency of -the strip type piezoelectric resonator of Fig.
3 is 'tO0 ~ when used as an oscillator.
For the actual use of the piezoelectric resonator of Fig. 3 as deseribed so far, the respective reglons 12 and 13 on the upper main electrode face lOA divided by the groove 11 are short-circuited to each other so as to be connected to a lead wire 14 for the upper side, while a lead wire 4 is connected to the lower main electrode face 10~ in the similar manner as in the conventional arrangement of Fig. 1 or 2, and thus, a two terminal type resonator is constituted.
Subsequently, in the piezoelectric resonator having the construction as shown in Fig. 3, on the assumption that the distance through which the groove 11 is deviated from the center in the widthwise direction of the piezoelectric ceramic substrate 10 is represented by S, and the width of the piezoelectric ceramic substrate ln is ~denoted by W as referred to earlier, measurements were taken on the characteristics thereof, with the value of S/W
employed as a parameter. As shown in Fig. 4, response level was represented as a level difference between resonant point and anti-resonant point.
~ s a result of the above measurements, it has been found as shown in Fig. 5 that, as the value S/W increases,
02 _C GROUND OF THE INVENTION
03 The present invention generally relates 04 to a piezoelectric resonator and more particularly, 05 to an improved strip type or rectangular type 06 piezoelectric resona-tor for use, for example, in 07 oscillators, electr:ical Eilters and -the like.
08 Wi.th -the recent progre~s in the Eield of 09 in-tegrated circuits, inexpens:ive ceramic resonators have been widely utilized for the actual 11 applications, and normally, disc type or rectangular 12 plate type piezoelectric reso:nators are generally 13 employed ~or the purpose in a rang~ of resonance 14 frequencies Erom 100 KHZ up to 1 MHZ so as to utilize the expansion mode of vibration thereof.
16 _RIEF_DESCRIPTION OF THE DRAWINGS
17 Objects and features of the present 18 invention will become apparent from the following 19 description taken in conjunction with the preferred embodiment thereof with reference to the 21 accompanying drawings, in which:
22 Figure 1 is a perspective view showing a 23 construction of a conventional rectangular plate 24 type piezoelectric resonator (already referred to), Figure 2 is a perspective view showing a 26 construction of a conventional strip type 27 piezoelectric resonator (already referred to), 28 Figure 3 is a perspective view showing a 29 strip type piezoelectric resonator according to one preferred embodiment of the present invention, 31 Figure 4 is a graph showing a state of 32 resonance in the strip type piezoelectric resonator 33 according to the present invention, and 34 Figure 5 is a graph showing variations in the characteristics of the strip type 36 piezo~lectric resonator according to the present 37 invent.ion when position of the groove is altered.
~",~ 3~
01 ~ 2 -02 As shown in Figure L, the known 03 rec-tangular plate type piezoelec-tric resonator 04 reerred to above includes, for example, a 05 piezoelectric ceramic substrate 1, main electrode 06 faces 2 and 3 Eormed on -the opposite surEaces of 07 sald p:iezoelectric ceramic substra-te 1, and lead 08 wires 4 respectively connected to said main 09 electrode faces 2 and 3. However, in the rectangular plate type piezoelectric resonator as 11 described above or di5c type piezoelectric resona-tor 12 conventionally employed, there have been such 13 disadvan-tages that they are generally large in s:ize, 14 and moreover, tend to produce spurious waves due to thickness mode vibrakion based on -the fundamental 16 wave.
17 Meanwhile, as shown in Figure 2, there 18 has also been conventionally available a strip type 19 piezoelectric resonator utili~ing length mode vibration based on the fundamental wave, and having 21 a construction generally similar to that of the 22 rectangular plate type piezoelectric resonator in 23 Figure 1 as represented by like re~erence 24 numerals. Although advan~ageous in that the dimensions are reduced as compared with the 26 rectangular plate type or disc type piezoelec~ric 27 resonator, the conventional strip type pieæoelectric 28 resona~or as described above still has disadvantages 29 in that undesirable spurious responses due to wid-th mode vibration and thickness mode vibration tend to 31 be produced.
32 SUMMARY OF THE I~VENTIO
33 Accordingly, an essential object of the 34 present invention is to provide an improved strip type piezoelectric resonator in which undesirable 36 spurious responses due to width mode vibration and 37 thickn~ss mode vibration are suppressed by forming a ,, ~,~.
,1"~
3~
01 ~ 3 ~
02 groove on one of oppos.ite main elec-trode faces of 03 the resonator, in a direc-t:ion parallel to the 04 longi-tudinal direction thereof and at a posi-tion 05 deviated from a center in a widthwise direction oE a 06 piezoelectric ceramic substrate, wi-th substantial 07 elimination of disadvantages inherent in the 08 conventional piezoelectric resonators of this kind.
09 Another important object of the pre~ent invention is to provide a strip type piezoelec-tric 11 resonator of -~he above described type, which is 12 simple in construction and stable in functioniny a~
13 high reliability, and can be readily manufactured on 14 a large scale at low cost.
In accomplishing these and other 16 objects, according to one preferred embodiment of 17 the present invention, there is provided a strip 18 type piezoelectric resonator utilizing length mode 19 vibra~ion, which includes a piezoelectric ceramic substrate, and first and second main electrode faces 21 formed on opposite surEaces of ~he piezoelectric 22 ceramic substrate, and is characterized in that 23 there is further provided a groove which i5 formed 24 in one of the first and second main electrode faces so as to extend over an entire length of the 26 piezoelectric ceramic substrate in a direction 27 parallel to the longitudinal direction thereof, and 28 at a position deviated from a center in a widthwise 29 direction of the piezoelectric ceramic substrate by more than 2~ of the width of said piezoelectric 31 ceramic substrate.
32 By arrangement according to the present 33 invention as described above, an improved strip type 34 piezoelectric resonator with suppressed spurious responses has been advantageously presented through 36 simple constructionO
01 - ~ -02 BeEore the description of the pre~en-t 03 invention proceeds, it is to be noted tha-t like 04 parts are designated by like reference numeral~
05 throughout the accompanying drawings.
06 ReEerring now to ~he drawings, -there is 07 shown in Figure 3 a str.ip type piezoelectric 0~ resonator according to one preferred embodiment of 09 the present invention, w~ich generally includes a piezoelectric ceramic substrate 10, and 6~
upper and lower main electrode faces lOA and los formed on opposite surface& of the substrate 10. In one surface of the piezoelectric ceramic substrate 10 at the side of the upper main electrode face lOA, there is formed a groove 11 which extends ovex an entire lenyth of the substrate 10 in a direction parallal to the longitudinal direction of said substrate 10 and is located at a position deviated, at its center line in a widthwise direction thereof, from a center line in the widthwise direction of the upper main electrode face lOA or the substrate 10 as illustrated. By the above groove 11, the upper main electrode face lOA of the substrate 10 is divided into a large region ]2 and a small region 13, while the lower main electrode face lOB is formed on the other entire surface of the substr~te 10 in the similar manner as in the conventional arrangement of Figs. 1 or 2.
More specifically, by way of example, the piezoelectric ceramic substrate 10 is set in dimensions to be 4.65 mm in length, 0.8 mm in width W, and 0.3 rnm in thickness, and the groove 11 has a width of 0.15 mm and a depth of 0.15 mm, while a distance through which the groove 11 i5 deviated from the center in the widthwise direction of the pie~oelectric cerarnic substrate 10, i.e. a distance S
from the center of the substrate 10 in its widthwise direction to the center of said groove 11 in the widtilwise direction thereof is set to be 0.1 mm, and the oscillation 3~
frequency of -the strip type piezoelectric resonator of Fig.
3 is 'tO0 ~ when used as an oscillator.
For the actual use of the piezoelectric resonator of Fig. 3 as deseribed so far, the respective reglons 12 and 13 on the upper main electrode face lOA divided by the groove 11 are short-circuited to each other so as to be connected to a lead wire 14 for the upper side, while a lead wire 4 is connected to the lower main electrode face 10~ in the similar manner as in the conventional arrangement of Fig. 1 or 2, and thus, a two terminal type resonator is constituted.
Subsequently, in the piezoelectric resonator having the construction as shown in Fig. 3, on the assumption that the distance through which the groove 11 is deviated from the center in the widthwise direction of the piezoelectric ceramic substrate 10 is represented by S, and the width of the piezoelectric ceramic substrate ln is ~denoted by W as referred to earlier, measurements were taken on the characteristics thereof, with the value of S/W
employed as a parameter. As shown in Fig. 4, response level was represented as a level difference between resonant point and anti-resonant point.
~ s a result of the above measurements, it has been found as shown in Fig. 5 that, as the value S/W increases,
2~ the main respcnse decreases only slightly, whereas the spurious responses due to width mode vibration by third harmonics (first excited overtone of width mode), ancl thickness mode vibration and width mod~ vibration based on the fundarnental wave are reduced to a large e:Yten-t.
Normally, for the spurious oscillation to be suppressed, it is necessary that the spurious responses are reduced to less than half of the main response, and in order to satisfy the above requirement in -the result oE
measurement in Fig. 5, S/l~ must be laryer than 2%. On the other hand, as the position of the groove 11 is gradually spaced or deviated from the center of the piezoelectric ceramic substrate 10, the arrangement for supporting the piezoelectric ceramic substrate 10 may undesirably be complicated, while the strength of the substrate 10 at the region 13 which is narrow in width tends to be reduced, and therefore, the upper limit o~ S/W should preferably be 30~.
Accordingly, as is seen from the above description, the range for the positional deviation of the groove 11 to be provided in the present inventic)n~ from the center in the widthwise direction of the piezoelectric ceramic substrate 10 should be more than 2~ of the wiclth of the ceramic substrate 10.
In the arrangement of Fig. 3, although the groove 11 is provided in the upper main electrode face 10A, lt is needless to say that such groove 11 may be so modified as to be provided in the lower main electrode face 10~ to obtain the same effect.
Moreover, in the foregoing embodiment, even when the dimensions (width and depth) of the groovc 11 are altered, results of measurements generally in th~ similar trelld as in those of Fig. 5 have been obtained.
I-t should be noted here that, although the arrangemen-t of the present invention i~5 prepared as a resonator, it is best suited to applications to an oscillator.
For manufacturing the strip type piezoelectric resonator according to the present inverltion in an efficient manner, processings may be effected by such steps as forming electrode layers over the entire opposite surfaces, i.e.
uE)per and lower surfaces of a large piezoelectric ceramic plate having a predetermined thickness, subsequently forming grooves each having the predetermined wid-th and depth in one of the electrode formed surfaces at equal intervals, and inally cutting off the large piezoelectric cer~mic plate thus processed into dimensions of individual piezoelectric resonators as shown in Fig. 3.
As is clear from the foregoing descriptic~n, according to the present invention, since the piezoelectric resonator is constituted by forming the groove in one of the main electrode faces of the strip type piezoelectric ceramic substrate in a direction parallel to the longitudinal direction thereof, and at a position deviated by more than 2~ of the width of said substrate rom the center in the widthwise direction of said piezoelectric ceramic substrate, spurious responses due to width mode vibration and thickness rnode vibration may be suppressed to less than 35 dB with _ 9 _ respect to the main response of 70 dB, and thus, the piezoelectric resonator free from genera-tion of spurious response has been advant~geously presented, Although the present invention has been fu].].y described bv way of example with reference to the accompanyi.ng drawi.ngs, it is to be noted here that various changes and modifications will be apparent to those skilled in the art~ Therefore, unless otherwise such changes and modifications depart from the scope o:E the present invention, they should be construed as included therein.
,
Normally, for the spurious oscillation to be suppressed, it is necessary that the spurious responses are reduced to less than half of the main response, and in order to satisfy the above requirement in -the result oE
measurement in Fig. 5, S/l~ must be laryer than 2%. On the other hand, as the position of the groove 11 is gradually spaced or deviated from the center of the piezoelectric ceramic substrate 10, the arrangement for supporting the piezoelectric ceramic substrate 10 may undesirably be complicated, while the strength of the substrate 10 at the region 13 which is narrow in width tends to be reduced, and therefore, the upper limit o~ S/W should preferably be 30~.
Accordingly, as is seen from the above description, the range for the positional deviation of the groove 11 to be provided in the present inventic)n~ from the center in the widthwise direction of the piezoelectric ceramic substrate 10 should be more than 2~ of the wiclth of the ceramic substrate 10.
In the arrangement of Fig. 3, although the groove 11 is provided in the upper main electrode face 10A, lt is needless to say that such groove 11 may be so modified as to be provided in the lower main electrode face 10~ to obtain the same effect.
Moreover, in the foregoing embodiment, even when the dimensions (width and depth) of the groovc 11 are altered, results of measurements generally in th~ similar trelld as in those of Fig. 5 have been obtained.
I-t should be noted here that, although the arrangemen-t of the present invention i~5 prepared as a resonator, it is best suited to applications to an oscillator.
For manufacturing the strip type piezoelectric resonator according to the present inverltion in an efficient manner, processings may be effected by such steps as forming electrode layers over the entire opposite surfaces, i.e.
uE)per and lower surfaces of a large piezoelectric ceramic plate having a predetermined thickness, subsequently forming grooves each having the predetermined wid-th and depth in one of the electrode formed surfaces at equal intervals, and inally cutting off the large piezoelectric cer~mic plate thus processed into dimensions of individual piezoelectric resonators as shown in Fig. 3.
As is clear from the foregoing descriptic~n, according to the present invention, since the piezoelectric resonator is constituted by forming the groove in one of the main electrode faces of the strip type piezoelectric ceramic substrate in a direction parallel to the longitudinal direction thereof, and at a position deviated by more than 2~ of the width of said substrate rom the center in the widthwise direction of said piezoelectric ceramic substrate, spurious responses due to width mode vibration and thickness rnode vibration may be suppressed to less than 35 dB with _ 9 _ respect to the main response of 70 dB, and thus, the piezoelectric resonator free from genera-tion of spurious response has been advant~geously presented, Although the present invention has been fu].].y described bv way of example with reference to the accompanyi.ng drawi.ngs, it is to be noted here that various changes and modifications will be apparent to those skilled in the art~ Therefore, unless otherwise such changes and modifications depart from the scope o:E the present invention, they should be construed as included therein.
,
Claims
The embodiments of the invention in which an exclusive property or privilege is claimed are defined as follows:
(1) A strip type piezoelectric resonator utilizing length mode vibration, which comprises a piezoelectric ceramic substrate, and first and second main electrode faces formed on opposite surfaces of the piezoelectric ceramic substrate, the improvement comprising a groove which is formed on one of said first and second main electrode faces so as to extend over an entire length of the piezoelectric ceramic substrate in a direction parallel to the longitudinal direction thereof, and at a position deviated from a center in a widthwise direction of the piezoelectric ceramic substrate by more than 2% of the width of said piezoelectric ceramic substrate.
(2) A strip type piezoelectric resonator as claimed in claim l, wherein said piezoelectric ceramic substrate is set to be 4.65 mm in length, 0.8 mm in width and 0.3 mm in thickness, and said groove is set to be 0.15 mm in width and 0.15 mm in depth, said groove being deviated at its center in a widthwise direction thereof, from the center in the widthwise direction of said piezoelectric ceramic substrate by 0.1 mm, said piezoelectric resonator having a frequency at 400 KHZ when used as an oscillator.
(3) A strip type piezoelectric resonator as claimed in claim 1, wherein one region and the other region in the one of said first and second main electrode faces divided by said groove are short circuited to each other.
(4) A process of manufacturing a strip type piezoelectric resonator utilizing length mode vibration, which comprises a piezoelectric ceramic substrate, and first and second main electrode faces formed on opposite surfaces of the piezoelectric ceramic substrate, and is characterized in that there is further provided a groove which is formed on one of said first and second main electrode faces so as to extend over an entire length of the piezoelectric ceramic substrate in a direction parallel to the longitudinal direction thereof, and at a position deviated from a center in widthwise direction of the piezoelectric ceramic substrate by more than 2% of the width of said piezoelectric ceramic substrate, said process comprising the steps of forming electrode layers for said first and second main electrode faces over entire opposite surfaces of a large area piezoelectric ceramic plate having a predetermined thickness, subsequently forming groove rows each having predetermined width and depth for said groove on one of said electrode layers at equal intervals, and finally cutting off said large area piezoelectric ceramic substrate thus processed into the dimensions of said individual strip type piezoelectric resonators.
(1) A strip type piezoelectric resonator utilizing length mode vibration, which comprises a piezoelectric ceramic substrate, and first and second main electrode faces formed on opposite surfaces of the piezoelectric ceramic substrate, the improvement comprising a groove which is formed on one of said first and second main electrode faces so as to extend over an entire length of the piezoelectric ceramic substrate in a direction parallel to the longitudinal direction thereof, and at a position deviated from a center in a widthwise direction of the piezoelectric ceramic substrate by more than 2% of the width of said piezoelectric ceramic substrate.
(2) A strip type piezoelectric resonator as claimed in claim l, wherein said piezoelectric ceramic substrate is set to be 4.65 mm in length, 0.8 mm in width and 0.3 mm in thickness, and said groove is set to be 0.15 mm in width and 0.15 mm in depth, said groove being deviated at its center in a widthwise direction thereof, from the center in the widthwise direction of said piezoelectric ceramic substrate by 0.1 mm, said piezoelectric resonator having a frequency at 400 KHZ when used as an oscillator.
(3) A strip type piezoelectric resonator as claimed in claim 1, wherein one region and the other region in the one of said first and second main electrode faces divided by said groove are short circuited to each other.
(4) A process of manufacturing a strip type piezoelectric resonator utilizing length mode vibration, which comprises a piezoelectric ceramic substrate, and first and second main electrode faces formed on opposite surfaces of the piezoelectric ceramic substrate, and is characterized in that there is further provided a groove which is formed on one of said first and second main electrode faces so as to extend over an entire length of the piezoelectric ceramic substrate in a direction parallel to the longitudinal direction thereof, and at a position deviated from a center in widthwise direction of the piezoelectric ceramic substrate by more than 2% of the width of said piezoelectric ceramic substrate, said process comprising the steps of forming electrode layers for said first and second main electrode faces over entire opposite surfaces of a large area piezoelectric ceramic plate having a predetermined thickness, subsequently forming groove rows each having predetermined width and depth for said groove on one of said electrode layers at equal intervals, and finally cutting off said large area piezoelectric ceramic substrate thus processed into the dimensions of said individual strip type piezoelectric resonators.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP104645/1982 | 1982-07-09 | ||
| JP10464582U JPS599627U (en) | 1982-07-09 | 1982-07-09 | piezoelectric resonator |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1196069A true CA1196069A (en) | 1985-10-29 |
Family
ID=14386188
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000432099A Expired CA1196069A (en) | 1982-07-09 | 1983-07-08 | Piezoelectric resonator |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JPS599627U (en) |
| CA (1) | CA1196069A (en) |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5327740B2 (en) * | 1972-09-27 | 1978-08-10 | ||
| JPS4963392A (en) * | 1972-10-20 | 1974-06-19 | ||
| JPS5327740U (en) * | 1976-08-18 | 1978-03-09 |
-
1982
- 1982-07-09 JP JP10464582U patent/JPS599627U/en active Granted
-
1983
- 1983-07-08 CA CA000432099A patent/CA1196069A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| JPS599627U (en) | 1984-01-21 |
| JPH0246103Y2 (en) | 1990-12-05 |
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Legal Events
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| MKEC | Expiry (correction) | ||
| MKEX | Expiry |