CN102163688A - Piezoelectric body module - Google Patents
Piezoelectric body module Download PDFInfo
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- CN102163688A CN102163688A CN201010281065XA CN201010281065A CN102163688A CN 102163688 A CN102163688 A CN 102163688A CN 201010281065X A CN201010281065X A CN 201010281065XA CN 201010281065 A CN201010281065 A CN 201010281065A CN 102163688 A CN102163688 A CN 102163688A
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Abstract
The invention provides a piezoelectric body module capable of preventing the pollution of the housing when a conductive body is formed on the outer surface of the piezoelectric body. The piezoelectric body module comprises a polarized piezoelectric body (12), at least two electrodes (12a, 12a) formed on the outer surface of the piezoelectric body, a housing (14) for accommodating the piezoelectric body equipped with an opening (14b) for exposing part of the outer surface of the accommodated piezoelectric body, a conductive body (24) formed by a conductive body and a yielding part (30) connected with the opening so as to be prevented from being contact with the conductive body.
Description
Technical field
The present invention relates to be suitable for the piezoelectrics module of purposes such as piezoelectric transformer, piezo-activator or piezoelectric motors.
Background technology
In this module, use piezoelectrics (piezoelectric element).Piezoelectrics have the function of the mechanical energy of converting electrical energy into, and carry out mechanical oscillation (resonance phenomena) by applying voltage.In these piezoelectrics, for example on outer surface paired on its thickness direction, form electrode respectively, implement polarization and handle.
Herein, disclose and utilize resistance to connect structure (for example, with reference to patent documentation 1,2) between these electrodes.
This is to consider following aspect: when the temperature around the piezoelectrics changes, because so-called thermoelectric effect produces electric charge or causes discharge easily between electrode, as countermeasure at this thermoelectric effect, utilize conductive coating paint to interconnecting between these electrodes, at the outer surface formation conductive film covering of piezoelectrics.
[patent documentation 1] Japanese kokai publication hei 11-330578 communique
[patent documentation 2] TOHKEMY 2000-307166 communique
But, in housing, keep under the situation of piezoelectrics, form conductive film covering at the outer surface of piezoelectrics in advance before sometimes in being received into housing.
At this moment, when supposing that the operator is received into piezoelectrics in the housing with the state that tilts a little, the conductive film covering of piezoelectrics contacts with housing, and its conductive coating paint is attached on the housing and pollute.
There is following problem in addition: when directly being assembled into the piezoelectrics module in the product, become reason to the generation infringements such as circuit block of this product.This be because, attached to the conductive film covering on the above-mentioned housing because the vibration in piezoelectrics when action and coming off from housing may make the short circuit of product.
On the other hand, the outer surface at piezoelectrics after being received into housing forms under the situation of conductive film covering, can produce the problems referred to above too.This be because, in the formation of conductive film covering, use aqueous conductive coating paint, when only the outer surface of piezoelectrics being applied this conductive coating paint under this receiving state, its liquid level also touches housing easily.
Summary of the invention
Therefore, the objective of the invention is to address the above problem, even provide a kind of outer surface to form the piezoelectrics module that conductive film covering can prevent that also housing from polluting at piezoelectrics.
Be used to realize that the 1st invention of above-mentioned purpose has: polarized piezoelectrics; Be formed at least two electrodes of the outer surface of piezoelectrics; Housing, it takes in piezoelectrics, and has the opening that the outer surface that makes the part of piezoelectrics under this receiving state exposes; Electric conductor, it is made of electric conductor, forms along the outer surface that exposes by opening, interconnects between the electrode and to giving resistance value between the electrode; And yielding portion, it links to each other with opening, avoid be formed on the outer surface that exposes on electric conductor between contact.
According to the 1st invention, at least two electrodes of outer surface formation of piezoelectrics, these electrodes connect by electric conductor.
In addition, in electric conductor of the present invention, except the conductive film covering that for example utilizes conductive coating paint, also be suitable for the conductivity adhesive tape, can utilize methods such as oozing drop or stickup easily to form.Thus, in the formation of electric conductor, automation can be realized, the production efficiency of piezoelectrics module can be improved.
, in housing of the present invention, be provided with yielding portion herein, can avoid be formed on the outer surface that exposes on electric conductor between contact.Thus, even form electric conductor in advance on piezoelectrics, the piezoelectrics that will have an electric conductor are received under the situation in the housing, also can avoid the pollution of housing, can prevent to be assembled with the unfavorable condition of circuit block etc. of the product of piezoelectrics module.As a result, the production efficiency of piezoelectrics module can be improved, its reliability can also be improved.
The 2nd invention is characterised in that, in the structure of the 1st invention, when forming electric conductor on the outer surface that under receiving state, is exposing, yielding portion avoid with this electric conductor between contact.
According to the 2nd invention, except the effect of the 1st invention, this electric conductor is formed on the outer surface that exposes by opening.Promptly, after piezoelectrics being received in the housing, form electric conductor, compare with situation about being pre-formed before being received into housing on piezoelectrics, electric conductor can not peel off when worrying on electrode etc. other structure members being set, can be reliably to connecting between the electrode.
In addition, yielding portion can avoid with this electric conductor between contact.Thus, even forming electric conductor on the outer surface at piezoelectrics under the above-mentioned receiving state, also can avoid the pollution of housing.
The 3rd invention is characterised in that, in the structure of the 1st or the 2nd invention, piezoelectrics constitute roughly rectangular shape, on the other hand, electrode is formed on the face paired on the thickness direction of these piezoelectrics, yielding portion has the protrusion opening, observes from this thickness direction, and this protrusion opening protrudes towards the direction of leaving electric conductor.
According to the 3rd invention, except the effect of the 1st or the 2nd invention, yielding portion has the protrusion opening.Particularly, observe from the thickness direction of piezoelectrics, this protrusion opening forms leaving on the direction of electric conductor and protrudes, and what can make housing may be near the part of electric conductor away from electric conductor.Thus, can avoid on housing, forming unnecessary electric conductor reliably.
The 4th invention is characterised in that, in the structure of the 1st to the 3rd invention, piezoelectrics constitute roughly rectangular shape, on the other hand, electrode is formed on the face paired on the thickness direction of these piezoelectrics, yielding portion has recessed opening, and from observing with the Width of the piezoelectrics of both sides' approximate vertical of the length direction of this thickness direction and piezoelectrics, this recessed opening is recessed towards the direction of leaving electric conductor.
According to the 4th invention, except the effect of the from the 1st to the 3rd invention, yielding portion has from the Width observation of piezoelectrics is leaving recessed opening recessed on the direction of electric conductor.What thus, can make housing may can avoid forming unnecessary electric conductor reliably near the part of electric conductor away from electric conductor on housing.
And, by the recessed opening of this recessed formation, easily electric conductor is carried out the visual examination or the affirmation (whether inspection or affirmation electric conductor correctly form with respect to electrode) of outward appearance with respect to the formation state of electrode, also help the high efficiency of its quality management.
The 5th the invention be characterised in that, the 4th the invention structure in, the position of the rigidity of housing when recessed opening is recessed into the action that can guarantee piezoelectrics.
According to the 5th invention; except the effect of the 4th invention; usually; in piezoelectrics because the piezoelectric effect in its when action produces vibration; therefore require housing to have vibration that absorbs piezoelectrics or the function of protecting piezoelectrics; therefore the position of the rigidity of housing when recessed opening is formed on the action of guaranteeing piezoelectrics is without detriment to the function of this housing.
The 6th invention is characterised in that, in the structure of the 4th or the 5th invention, observes from the length direction of piezoelectrics, and yielding portion is formed in the scope that can see from electrode to the part that does not form this electrode.
According to the 6th invention, except the effect of the 4th or the 5th invention, by recessed opening, except the formation state of electric conductor with respect to electrode, for the part that does not form this electrode in the piezoelectrics, also easily its outward appearance is carried out visual examination or affirmation (whether inspection or affirmation electric conductor only correctly are formed on the electrode attached to the part that does not have electrode), help further to improve its quality management.
According to the present invention, a kind of piezoelectrics module that contacts that can avoid between housing and the electric conductor that constitutes is provided, even on the outer surface of piezoelectrics, form electric conductor, also can prevent the pollution of housing.
Description of drawings
Fig. 1 is the exploded perspective view of the piezoelectric transformer of present embodiment.
Fig. 2 is the stereogram of completion status that the piezoelectric transformer of Fig. 1 is shown.
Fig. 3 is the partial plan of the housing of Fig. 1.
Fig. 4 is the part end view of the housing of Fig. 1.
Fig. 5 is the part end view that the state of back coating electrically conductive coating in the housing of Fig. 1 that piezoelectric ceramic is accommodated in is shown.
Fig. 6 is the part end view of the piezoelectric transformer of Fig. 2.
Label declaration:
10: piezoelectric transformer (piezoelectrics module); 12: piezoelectric ceramic (piezoelectrics); 12a: primary side electrode (electrode); 14: housing; 14b: incorporating section (opening); 22: conductive coating paint; 24: conductive film covering (electric conductor); 30: yielding portion; 32: protrude opening; 34: recessed opening.
Embodiment
Below, with reference to the description of drawings embodiments of the present invention.In addition, enumerate that below the execution mode of piezoelectrics module application to piezoelectric transformer described, but piezoelectrics module of the present invention is not limited to the mode of piezoelectric transformer.
Fig. 1 is the exploded perspective view of the piezoelectric transformer 10 of present embodiment, and Fig. 2 is the stereogram of the completion status of this piezoelectric transformer 10.
In addition, this Fig. 1 is a shape of understanding housing 14 for easier, isolates the figure of piezoelectric ceramic 12 from the completion status of Fig. 2.That is, not on piezoelectric ceramic 12, to form after the conductive film covering (electric conductor) 24, piezoelectric ceramic 12 is received in the housing, but as described later the piezoelectric ceramic 12 that is accommodated in the housing 14 is formed conductive film covering 24 (Fig. 5 etc.).
In addition, this piezoelectric transformer 10 for example is used for the high pressure power supply of the inverter that liquid crystal back of the body illuminator uses etc., utilizes the input of low-voltage to produce high-tension output.
Particularly, as shown in Figure 1 and Figure 2, piezoelectric transformer 10 mainly has piezoelectric ceramic (piezoelectrics) 12 and resinous housing 14, and piezoelectric ceramic 12 is accommodated in the housing 14.In addition, the top of this Fig. 1, Fig. 2 is equivalent to the bottom surface side of housing 14, and piezoelectric transformer 10 is installed in the face of the state of the installed surface of the circuit substrate (not shown) of product with the bottom surface side of its housing 14.
The piezoelectric ceramic 12 of present embodiment polarizes to the piezoelectric vibrator of for example lead zirconate titanate class pottery (PZT) etc. and constitutes.Shape for this piezoelectric ceramic 12 is not particularly limited, but can enumerate roughly rectangular shape (tabular) herein as an example.
In the outer surface of piezoelectric ceramic 12, on two paired on its thickness direction faces, be formed with primary side electrode (electrode) 12a respectively.Though in Fig. 1, Fig. 2, only show single face, on the face of its opposition side, also be formed with same primary side electrode (electrode) 12a.
In addition, be formed with the function of the part performance drive division of primary side electrode 12a in the piezoelectric ceramic 12, do not form the function of the part performance Power Generation Section of this primary side electrode 12a.
In addition, rear end part in the outer surface of this piezoelectric ceramic 12, its length direction is formed with secondary side electrode 12b.The secondary side electrode 12b of present embodiment only is formed on paired on its thickness direction face (Fig. 1, shown in Figure 2 single face).
As shown in Figure 1, be welded with an end of conductor wire 16,16 (for example gold thread) respectively in the substantial middle position of primary side electrode 12a, 12a, and, also be welded with an end of conductor wire 16 (for example gold thread) in the substantial middle position of secondary side electrode 12b.
On the other hand, the profile that housing 14 constituent ratio piezoelectric ceramic 12 are big, portion is formed with the incorporating section 14b of cup-shaped within it.
Particularly, about incorporating section 14b, the bottom surface side of housing 14 is by opening, and 14 the upper face side from this bottom surface side towards housing (below being positioned among Fig. 1, Fig. 2) extends rear enclosed.That is, though not shown in the drawings, the opening of the housing 14 in the present embodiment is only at its bottom surface side.
In addition, incorporating section 14b forms than piezoelectric ceramic 12 big circles, can piezoelectric ceramic 12 be inserted and be accommodated in the 14b of this incorporating section from above-mentioned opening in edge-on mode.
In housing 14, be provided with 3 butt 18,18,20 altogether.Two butt 18,18 wherein are the primary side terminal, respectively with relative configuration of primary side electrode 12a.
These terminals 18,18 pass through respectively among protuberance 14a, the 14a that is inserted in housing 14, observe from Fig. 1, Fig. 2, and the distolateral 18a of one is outstanding towards the top from protuberance 14a.
Be formed with the through hole (the protuberance 14a in the front of Fig. 1, Fig. 2 side is shown in broken lines) that is used for terminal 18 in each protuberance 14a, terminal 18 is towards crooked about 90 ° of the length direction (identical with the length direction of piezoelectric ceramic 12) of housing 14.And, the distolateral 18b of another of terminal 18 respectively from protuberance 14a towards housing 14 length direction outstanding.
Remaining terminal 20 is the secondary side terminal.Observe from the length direction of housing 14, this terminal 20 is arranged on the end with primary side terminal 18a opposition side, observes from Fig. 1, Fig. 2, and one is distolateral outstanding towards the top.
In addition, another of the terminal 20 of present embodiment is distolateral to be embedded in the housing 14, but also can be outstanding from the upper surface side of housing 14.
In addition, as shown in Figure 2, under piezoelectric ceramic 12 was accommodated in state in the housing 14, the other end of above-mentioned each conductor wire 16 twined on nigh primary side terminal 18 or the secondary side terminal 20 respectively and welding.Thus, primary side electrode 12a, 12a are connected with primary side terminal 18,18, and secondary side electrode 12b is connected with secondary side terminal 20.
In addition, use not shown for example silicon bonding agent that piezoelectric ceramic 12 is fixed on the housing 14.Particularly, near above-mentioned protuberance 14a, 14a, be formed with height than this protuberance 14a (length of observing from the direction of the top surface side that connects housing 14 and bottom surface side respectively, identical with the Width of piezoelectric ceramic 12) low recess 14c, 14c, fill (or coating) silicon bonding agent and piezoelectric ceramic 12 remained in the housing 14 in these recesses 14c.
In addition, this silicon bonding agent is made of following material: piezoelectric ceramic 12 fixing (bonding) also can brought into play suitable elasticity to the moment in the housing 14.Therefore, piezoelectric ceramic 12 can vibrate at the internal freedom of housing 14 when it moves, and its vibrational energy is absorbed by the silicon bonding agent.In addition, if the joint (amplitude is zero position) of the mechanical oscillation that can produce at piezoelectric ceramic 12 is located piezoelectric ceramic 12 is fixed in the housing 14, position (for example joint of other between primary side electrode 12a and the secondary side electrode 12b) coating silicon bonding agent that also can be beyond this recess 14c then.
On the piezoelectric ceramic 12 of present embodiment, be formed with conductive film covering 24 herein, along its outer surface.
Observe from the length direction of piezoelectric ceramic 12, this conductive film covering 24 for example is formed on the substantial middle part.In addition, conductive film covering 24 form in the outer surface of crossing over piezoelectric ceramic 12, along the small end face of its length direction, rap around to two paired on its thickness direction faces, with primary side electrode 12a overlapping (superimposed).That is, conductive film covering 24 forms at the face of Fig. 1, the unshowned opposition side of Fig. 2 also overlapping with primary side electrode 12a.
As described later, the outer surface at piezoelectric ceramic 12 applies aqueous conductive coating paint and forms conductive film covering 24.For example the resin that comprises volatile solvent and conductive material are mixed and constitute this conductive coating paint.In addition, conductive film covering 24 forms along the small end face along the length direction of piezoelectric ceramic 12, to being electrically connected (Fig. 1, Fig. 2) between primary side electrode 12a, the 12a.
In addition, for observed piezoelectric ceramic 12 under receiving state shown in Figure 2, this piezoelectric ceramic 12 is embedded in the housing 14, and its small end face alongst is not outstanding from incorporating section 14b yet.But the small end face of this piezoelectric ceramic 12 exposes from incorporating section 14b, can see this small end face from the top of Fig. 2.
The piezoelectric transformer 10 of taking in piezoelectric ceramic 12 is with a distolateral 18a of terminal 18 and above-mentioned one distolateral state down of terminal 20, and use backflash etc. is welded on the circuit substrate of the said goods, is installed on this circuit substrate.
At this moment, the variations in temperature (reflux heat) during owing to welding produces the electric charge that thermoelectric effect causes in piezoelectric ceramic 12, and this electric charge mainly is consumed by conductive film covering 24.Therefore, the deterioration of the piezoelectric ceramic 12 that thermoelectric effect causes can be suppressed, and circuit block (for example input circuit, output circuit, control circuit etc.) discharge can be prevented and the infringement that produces the foregoing circuit substrate.
In addition, the conductive film covering 24 of present embodiment also continues to play a role after piezoelectric transformer 10 is installed on the foregoing circuit substrate, and the variation of peripheral temperature also is effective measure at thermoelectric effect during for piezoelectric transformer 10 work.
Particularly, conductive film covering 24 is set in the following scope: give resistance value between the primary side electrode 12a more than or equal to the resonant resistance value between this primary side electrode 12a (being preferably it more than 10 times), and smaller or equal to 10% of the insulating resistance value between the primary side electrode 12a.
In addition, the resistance value of managing (adjustment) conductive film covering 24 according to the length (above-mentioned length direction) of the scope of coating electrically conductive coating.Promptly, this conductive coating paint has the character of determining resistance value (giving the resistance value between the primary side electrode 12a) as a whole according to the area of its coating scope, therefore be made as one regularly at the width that will apply scope (above-mentioned thickness direction), can determine resistance value according to the length (roughly pro rata) of coating scope.
More specifically, for the scope of answering coating electrically conductive coating, observe from the above-mentioned thickness direction of piezoelectric ceramic 12 (crossing over the direction of small end face to dorsal surface from the face of front side), consideration will connect between two primary side electrode 12a required minimum range and be made as the application width (thickness of piezoelectric ceramic 12+α).In addition, when the resistance value that will have obtained is made as " initial unitary resistance value (Ω/mm) ", try to achieve conductive film covering 24 overall resistance values of giving (Ω) by " initial unitary resistance value (Ω/mm) " * " coating length (mm) " in the time will having applied the conductive coating paint of unit length according to the application width of this moment.
Thus, if obtain initial unitary resistance value (Ω/mm), then after this can only apply the resistance value that length is easily managed conductive film covering 24 by adjusting it according to the rerum natura of employed conductive coating paint and the application width of necessity.
But the conductive film covering 24 of present embodiment forms after piezoelectric ceramic 12 being received in the housing 14.
Particularly, piezoelectric ceramic 12 is configured among the 14b of incorporating section, its small end face exposes from incorporating section 14b, the above-mentioned aqueous conductive coating paint of coating under this state, the liquid level of this conductive coating paint (for example roughly spherical) be attached to easily in the housing 14, especially on the incorporating section 14b etc. around the boundary vicinity between above-mentioned drive division and the Power Generation Section, housing 14 is polluted by conductive coating paint easily.
Therefore, in the housing 14 of present embodiment, be provided with the yielding portion 30 that links to each other with incorporating section 14b, eliminate the position of being polluted by this conductive coating paint easily.
Particularly, except Fig. 1, Fig. 2, shown in Figure 4 as the end view of this substantial middle part of Fig. 3 of the plane graph of observing the substantial middle part from the length direction of housing 14 and this housing 14, the yielding portion 30 of present embodiment constitutes by protruding opening 32 and recessed opening 34.
Observe from the thickness direction of piezoelectric ceramic 12, this protrusion opening 32 protrudes (Fig. 1, Fig. 3) towards the direction of leaving from the small end face that is formed with conductive film covering 24 respectively, the a pair of protrusion opening 32 in these both sides forms than the big space, space that forms between incorporating section 14b and primary side electrode 12a respectively, avoids and the contacting of the liquid level of conductive coating paint.
Then, observe from the Width of piezoelectric ceramic 12, recessed opening 34 is respectively towards the direction of leaving from the small end face that is formed with conductive film covering 24 recessed (Fig. 1, Fig. 4).
Particularly, the a pair of recessed opening 34 in these both sides forms height than above-mentioned recess 14c (from the upper surface side that connects housing 14 length with the direction observation of bottom surface side, identical with the Width of piezoelectric ceramic 12) lower, especially, the recessed opening 34 recessed one-tenth of present embodiment for the height of housing 14, be low to moderate only about half of about.Thus, avoid and the contacting of the liquid level of conductive coating paint, and the rigidity of housing 14 when guaranteeing piezoelectric ceramic 12 actions.
In addition, observe from the length direction of piezoelectric ceramic 12, these protrusion openings 32 and recessed opening 34 are formed on from the drive division that is formed with primary side electrode 12a until do not form the scope of the Power Generation Section of primary side electrode 12a, as in the housing 14 of Fig. 4, taking in the shown in Figure 5 of piezoelectric ceramic 12, can be from the boundary position between these drive divisions of visual observation and the Power Generation Section.
In addition, under the receiving state of the observed piezoelectric ceramic 12 of Fig. 5, (position of the boundary vicinity between drive division and the Power Generation Section) disposes syringe needle 40 above the small end face of piezoelectric ceramic 12, when the end from this syringe needle 40 drips the aqueous conductive coating paint 22 of above-mentioned adjusted scheduled volume, the liquid level of conductive coating paint 22, therefore only contacts with the small end face of piezoelectric ceramic 12 away from housing 14 owing to yielding portion 30.
Then, about being coated in the conductive coating paint 22 on this small end face, in just coating back with spherical heaving roughly, but when solvent evaporates is in air afterwards, resin and conductive material diffusion.Therefore, in small end face, should apply and formed the conductive film covering 24 (Fig. 6) that connects primary side electrode 12a, 12a in the scope of above-mentioned conductive coating paint 22.
As mentioned above, according to present embodiment, conductive film covering 24 forms along the small end face of piezoelectric ceramic 12, even observe piezoelectric transformer 10 separately, between the primary side electrode 12a of piezoelectric ceramic 12, do not clip miscellaneous part, be in the state that utilizes resistance (being conductive film covering 24) to connect.
Thus, when being assembled into this piezoelectric transformer 10 in the product, suppose that environment temperature changes in its manufacture process,, can the generations such as circuit block of product not damaged because the electric charge that its thermoelectric effect produced is also consumed rapidly.
In addition, conductive film covering 24 is made of aqueous conductive coating paint 22, can utilize methods such as oozing drop easily to apply.Thus, in the formation of conductive film covering 24, automation can be realized, the production efficiency of piezoelectric transformer 10 can be improved.
In addition, this conductive coating paint 22 is coated on the small end face that exposes by incorporating section 14b.Promptly, after piezoelectric ceramic 12 being received in the housing 14, apply, with be received into housing 14 before situation about in advance piezoelectric ceramic 12 being applied compare, conductive film covering 24 can not peel off when worrying on primary side electrode 12a etc. other structure members (for example conductor wire 16) being set, can be reliably to connecting between the primary side electrode 12a.
, in the housing 14 of present embodiment, be provided with yielding portion 30 herein, can avoid and the contacting of the liquid level of the conductive coating paint 22 of this coating.Thus,, also can avoid the pollution of housing 14, can prevent to be assembled with the unfavorable condition of circuit block etc. of the product of piezoelectric transformer 10 even under above-mentioned receiving state, conductive coating paint 22 is coated to the small end face of piezoelectric ceramic 12.As a result, the production efficiency of piezoelectric transformer 10 can be improved, and its reliability can be improved.
In addition, yielding portion 30 has the opening 32 of protrusion.Observe from the thickness direction of the piezoelectric ceramic 12 taken in, this protrusion opening 32 forms in the mode of protruding in the direction of leaving from conductive film covering 24 respectively, and what can make housing 14 may be near the part of conductive film covering 24 liquid level away from conductive coating paint 22.Thus, can avoid reliably on housing 14 forming foregoing circuit parts etc. are brought dysgenic unnecessary conductive film covering.
In addition, yielding portion 30 has following recessed opening 34: on the Width of the piezoelectric ceramic of taking in equally 12, observe, and recessed on the direction of leaving from conductive film covering 24 respectively.What thus, can make housing 14 may can further avoid forming above-mentioned unnecessary conductive film covering reliably near the part of conductive film covering 24 liquid level of conductive coating paint 22 further away from each other.
And, recessed opening 34 by this recessed formation, easily conductive film covering 24 is carried out the visual examination or the affirmation (whether inspection or affirmation conductive film covering 24 correctly form with respect to primary side electrode 12a) of outward appearance with respect to the formation state of primary side electrode 12a, also help the high efficiency of its quality management.
In addition; usually in piezoelectric ceramic 12; because the piezoelectric effect during its action produces vibration; therefore require housing 14 to have the vibration of absorption pressure electroceramics 12 or the function of protection piezoelectric ceramic 12; therefore the position of the rigidity of housing 14 when recessed opening 34 is formed on the action of guaranteeing piezoelectric ceramic 12 is without detriment to the function of this housing 14.
In addition, by recessed opening 34, except conductive film covering 24 with respect to the formation state as the primary side electrode 12a of drive division, promptly do not form the part of primary side electrode 12a for the Power Generation Section, also easily visual examination or confirm its outward appearance (check or confirm conductive film covering 24 whether not attached on this Power Generation Section and only correctly be formed on the drive division), help further to improve the efficient of quality management.
In addition, conductive film covering 24 is given resistance value between the primary side electrode 12a more than or equal to the resonant resistance value between this primary side electrode 12a, and smaller or equal to 10% of the insulating resistance value between the primary side electrode 12a.
This " resonant resistance value " is equivalent to the minimum resistance between the primary side electrode 12a of employed mode of resonance lower piezoelectric pottery 12 (before forming conductive film covering 24).In addition, " insulating resistance value " is the resistance value between the primary side electrode 12a of piezoelectric ceramic 12 (form conductive film covering 24 before), comprises internal resistance and sheet resistance herein simultaneously.
In addition, the lower limit set of the resistance value between the primary side electrode 12a that conductive film covering 24 is given is the resonant resistance value, resistance is not established low excessively, therefore when using piezoelectric transformer 10 (when applying input voltage), can by mistake do not carried out dividing potential drop input voltage.
In addition, the upper limit of the resistance value between the primary side electrode 12a that conductive film covering 24 is given controls to 10% of insulating resistance value.This is in view of following aspect: even merely the upper limit of resistance value is set at " less than insulating resistance value ", resistance value between the primary side electrode 12a of reality is set when too much with respect to thermoelectric voltage, can not disappear (consumption) from practical angle electric charge under most of situation, can not effectively bring into play the effect of actual thermoelectric countermeasure.As a result, the variations in temperature when being assembled into product can be brought into play practical thermoelectric countermeasure.In addition, when the use of product, can guarantee its normal piezoelectricity action, and also can bring into play effective thermoelectric countermeasure at the variations in temperature under the environment for use.
The invention is not restricted to the foregoing description, can in the scope that does not break away from claim, carry out various changes.
For example, observe from the length direction of piezoelectric ceramic 12, the conductive film covering 24 of the foregoing description is formed on the substantial middle part, but yielding portion of the present invention is so long as can connect position between the primary side electrode 12a, and near the incorporating section 14b that then also can form the terminal 18 with primary side links to each other.
In addition, in the above-described embodiments, observe from the thickness direction of the piezoelectric ceramic 12 taken in, protruding opening 32 protrudes on the direction of leaving conductive film covering 24, observe from the Width of the piezoelectric ceramic 12 taken in, recessed opening 34 is recessed on the direction of leaving conductive film covering 24, but not necessarily is limited to this mode.That is, as long as make the liquid level of housing 14 away from conductive coating paint 22, according to the configuration status of piezoelectric ceramic 12, protrude opening 32 and also can protrude on its Width or length direction, recessed opening 34 also can be recessed on its thickness direction or length direction.
In addition, in the above-described embodiments, conductive film covering 24 with each primary side electrode 12a state of contact under form.But, be in the above-mentioned proper range as long as form the resistance value of giving between the primary side electrode 12a under the state of conductive film covering 24 at the outer surface of piezoelectric ceramic 12, then conductive film covering 24 can directly not be connected with primary side electrode 12a.
In addition, in the above-described embodiments, form the situation of conductive film covering 24 after having illustrated in being received into housing 14 at the outer surface of piezoelectric ceramic 12, but before also can be in being received into housing 14 in advance at the outer surface formation conductive film covering 24 of piezoelectric ceramic 12.This is because in this case, when conductive film covering 24 contact with housing 14, its coating also can be attached on the housing 14 and pollution housing 14.
In addition, in the above-described embodiments, the example at the aqueous conductive coating paint 22 of the outer surface coating of piezoelectric ceramic 12 has been described.But, also can paste the conductivity adhesive tape at the outer surface of piezoelectric ceramic 12, for electric conductor of the present invention, except above-mentioned conductive coating paint, also be applicable to conductivity adhesive tape etc.
In addition, in the above-described embodiments, the example that is specially piezoelectric transformer 10 is illustrated, but piezoelectrics module of the present invention can also be applicable to for example piezo-activator or piezoelectric motors (ultrasonic motor).
In addition, under any one situation of these situations, with above-mentioned same, obtain following effect:, also can prevent the pollution of housing even form electric conductor at the outer surface of piezoelectrics.
Claims (6)
1. a piezoelectrics module is characterized in that, described piezoelectrics module has:
Polarized piezoelectrics;
Be formed at least two electrodes on the outer surface of described piezoelectrics;
Housing, it takes in described piezoelectrics, and has the opening that the outer surface that makes the part of described piezoelectrics under this receiving state exposes;
Electric conductor, it is made of electric conductor, forms along the described outer surface that exposes by described opening, interconnects between the described electrode and to giving resistance value between the described electrode; And
Yielding portion, it links to each other with described opening, avoid be formed on the described outer surface that exposes on described electric conductor between contact.
2. piezoelectrics module according to claim 1 is characterized in that,
When on the described outer surface that exposes, forming described electric conductor under the described receiving state, described yielding portion avoid with this electric conductor between contact.
3. piezoelectrics module according to claim 1 and 2 is characterized in that,
Described piezoelectrics constitute roughly rectangular shape, and on the other hand, described electrode is formed on the face paired on the thickness direction of these piezoelectrics,
Described yielding portion has the protrusion opening, observes from this thickness direction, and this protrusions opening is towards the direction protrusion that leaves described electric conductor.
4. according to any described piezoelectrics module in the claim 1 to 3, it is characterized in that,
Described piezoelectrics constitute roughly rectangular shape, and on the other hand, described electrode is formed on the face paired on the thickness direction of these piezoelectrics,
Described yielding portion has recessed opening, and from observing with the Width of the described piezoelectrics of both sides' approximate vertical of the length direction of this thickness direction and described piezoelectrics, this recessed opening is recessed towards the direction of leaving described electric conductor.
5. piezoelectrics module according to claim 4 is characterized in that,
The position of the rigidity of described housing when described recessed opening is recessed into the action that can guarantee described piezoelectrics.
6. according to claim 4 or 5 described piezoelectrics modules, it is characterized in that,
Observe from the length direction of described piezoelectrics, described yielding portion is formed in the scope that can see from described electrode to the part that does not form this electrode.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2010-036821 | 2010-02-23 | ||
| JP2010036821A JP5576143B2 (en) | 2010-02-23 | 2010-02-23 | Piezoelectric module |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102163688A true CN102163688A (en) | 2011-08-24 |
| CN102163688B CN102163688B (en) | 2015-01-07 |
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| CN201010281065.XA Active CN102163688B (en) | 2010-02-23 | 2010-09-10 | Piezoelectric body module |
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| KR101629170B1 (en) * | 2014-02-17 | 2016-06-21 | 주식회사 엠플러스 | Vibrator |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5298493A (en) * | 1976-02-13 | 1977-08-18 | Matsushita Electric Ind Co Ltd | Supporting method of piezo-electric transformer |
| JP2005278121A (en) * | 2004-03-26 | 2005-10-06 | Murata Mfg Co Ltd | Piezo-electric element and piezo-electric component |
| WO2009069590A1 (en) * | 2007-11-28 | 2009-06-04 | Tamura Corporation | Piezoelectric transformer |
| CN101452989A (en) * | 2007-12-05 | 2009-06-10 | 株式会社田村制作所 | Piezoelectric transformer |
| JP2009188102A (en) * | 2008-02-05 | 2009-08-20 | Tamura Seisakusho Co Ltd | Piezoelectric transformer |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000307166A (en) * | 1999-04-21 | 2000-11-02 | Tdk Corp | Piezoelectric transformer and drive stabilizing device thereof |
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- 2010-09-10 CN CN201010281065.XA patent/CN102163688B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5298493A (en) * | 1976-02-13 | 1977-08-18 | Matsushita Electric Ind Co Ltd | Supporting method of piezo-electric transformer |
| JP2005278121A (en) * | 2004-03-26 | 2005-10-06 | Murata Mfg Co Ltd | Piezo-electric element and piezo-electric component |
| WO2009069590A1 (en) * | 2007-11-28 | 2009-06-04 | Tamura Corporation | Piezoelectric transformer |
| CN101452989A (en) * | 2007-12-05 | 2009-06-10 | 株式会社田村制作所 | Piezoelectric transformer |
| JP2009188102A (en) * | 2008-02-05 | 2009-08-20 | Tamura Seisakusho Co Ltd | Piezoelectric transformer |
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| Publication number | Publication date |
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| CN102163688B (en) | 2015-01-07 |
| JP2011175990A (en) | 2011-09-08 |
| JP5576143B2 (en) | 2014-08-20 |
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