CN102163688B - Piezoelectric body module - Google Patents
Piezoelectric body module Download PDFInfo
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- CN102163688B CN102163688B CN201010281065.XA CN201010281065A CN102163688B CN 102163688 B CN102163688 B CN 102163688B CN 201010281065 A CN201010281065 A CN 201010281065A CN 102163688 B CN102163688 B CN 102163688B
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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 the piezoelectric body module being suitable for the purposes such as piezoelectric transformer, piezo-activator or piezoelectric motors.
Background technology
Piezoelectrics (piezoelectric element) are used in this module.Piezoelectrics have the function converting electrical energy into mechanical energy, carry out mechanical oscillation (resonance phenomena) by applying voltage.In these piezoelectrics, paired in the thickness direction thereof outer surface such as, form electrode respectively, implement polarization process.
Herein, disclose and utilize resistance to connect structure (for example, referring to patent documentation 1,2) between these electrodes.
This considers following aspect: when the temperature around piezoelectrics changes, produce electric charge in-between the electrodes due to so-called thermoelectric effect or easily cause electric discharge, as the countermeasure for this thermoelectric effect, utilize conductive coating paint to be interconnected between these electrodes, form conductive film covering at the outer surface of piezoelectrics.
[patent documentation 1] Japanese Unexamined Patent Publication 11-330578 publication
[patent documentation 2] Japanese Unexamined Patent Publication 2000-307166 publication
But when keeping piezoelectrics in the housing, the outer surface sometimes in advance at piezoelectrics before being received in housing forms conductive film covering.
Now, when supposing that piezoelectrics are received in housing with the state tilted a little by operator, the conductive film covering of piezoelectrics and body contact, its conductive coating paint is attached on housing and pollutes.
There is following problem in addition: when being directly assembled in product by piezoelectric body module, becoming the reason circuit block etc. of this product being produced to infringement.This is because the conductive film covering be attached on above-mentioned housing comes off from housing due to vibration during piezoelectrics action, may make the short circuit of product.
On the other hand, when forming conductive film covering at the outer surface of piezoelectrics after being received into housing, the problems referred to above can be produced too.This is because use aqueous conductive coating paint in the formation of conductive film covering, when only applying this conductive coating paint to the outer surface of piezoelectrics under this receiving state, its liquid level also easily touches housing.
Summary of the invention
Therefore, the object of the invention is to solve the problem, even if provide a kind of outer surface at piezoelectrics formation piezoelectric body module that conductive film covering also can prevent housing from polluting.
The 1st invention for realizing above-mentioned purpose has: polarized piezoelectrics; Be formed at least two electrodes of the outer surface of piezoelectrics; Housing, it receives piezoelectrics, and has the opening under this receiving state, the outer surface of a part for piezoelectrics being exposed; Electric conductor, it is made up of electric conductor, is formed, be interconnected between electrode and give resistance value between electrode along the outer surface exposed by opening; And relief portion, it is connected with opening, avoids and be formed in the contact between the electric conductor on the outer surface that exposes.
According to the 1st invention, form at least two electrodes at the outer surface of piezoelectrics, these electrodes are connected by electric conductor.
In addition, in electric conductor of the present invention, except such as utilizing the conductive film covering of conductive coating paint, be also suitable for conductivity adhesive tape, can utilize and ooze the method such as drop or stickup and easily formed.Thus, can automation be realized in the formation of electric conductor, the production efficiency of piezoelectric body module can be improved.
, in housing of the present invention, be provided with relief portion herein, can avoid and be formed in the contact between the electric conductor on the outer surface that exposes.Thus, even if forming electric conductor in advance on piezoelectrics, when being received in housing by the piezoelectrics with electric conductor, also can avoid the pollution of housing, the unfavorable condition of the circuit block of the product being assembled with piezoelectric body module etc. can be prevented.As a result, the production efficiency of piezoelectric body module can be improved, its reliability can also be improved.
The feature of the 2nd invention is, in the structure of the 1st invention, when forming electric conductor on the outer surface exposed under receiving state, relief portion avoids the contact between this electric conductor.
According to the 2nd invention, except the effect of the 1st invention, this electric conductor is formed on the outer surface that exposed by opening.Namely, electric conductor is formed after being received in housing by piezoelectrics, compared with situation about being previously formed in before being received into housing on piezoelectrics, when not worrying arranging other structure members on electrode etc., electric conductor can peel off, and can reliably connect between electrode.
In addition, relief portion can avoid the contact between this electric conductor.Thus, even if form electric conductor under above-mentioned receiving state on the outer surface of piezoelectrics, the pollution of housing can also be avoided.
The feature of the 3rd invention is, in the structure of the 1st or the 2nd invention, piezoelectrics are configured to roughly rectangular shape, on the other hand, electrode is formed on face paired on the thickness direction of these piezoelectrics, relief portion has protrusion opening, observes from this thickness direction, and this protrusion opening protrudes towards the direction leaving electric conductor.
According to the 3rd invention, except the effect of the 1st or the 2nd invention, relief portion has protrusion opening.Specifically, observe from the thickness direction of piezoelectrics, the side that this protrusion opening is formed as leaving electric conductor is protruding upward, and the part that may be close to electric conductor of housing can be made away from electric conductor.Thereby, it is possible to reliably avoid forming unnecessary electric conductor on housing.
The feature of the 4th invention is, in the structure of the 1st to the 3rd invention, piezoelectrics are configured to roughly rectangular shape, on the other hand, electrode is formed on face paired on the thickness direction of these piezoelectrics, relief portion has recessed opening, and observe from the Width of the substantially vertical piezoelectrics of the both sides of the length direction with this thickness direction and piezoelectrics, this recessed opening is recessed towards the direction leaving electric conductor.
According to the 4th invention, except the effect of the from the 1st to the 3rd invention, relief portion has observes recessed opening recessed on the direction leaving electric conductor from the Width of piezoelectrics.Thereby, it is possible to make the part that may be close to electric conductor of housing away from electric conductor, can reliably avoid on housing, form unnecessary electric conductor.
And, by the recessed opening that this is concavely formed, easily electric conductor is carried out to visual examination or the confirmation (check or confirm whether electric conductor is correctly formed relative to electrode) of outward appearance relative to the formation state of electrode, also contribute to the high efficiency of its quality management.
The feature of the 5th invention is, in the structure of the 4th invention, and the position of the rigidity of housing when recessed opening is recessed into the action guaranteeing piezoelectrics.
According to the 5th invention; except the effect of the 4th invention; usually; because piezoelectric effect during its action produces vibration in piezoelectrics; therefore require that housing has the vibration absorbing piezoelectrics or the function protecting piezoelectrics; the position of the rigidity of housing when recessed opening is formed in the action guaranteeing piezoelectrics, therefore without detriment to the function of this housing.
The feature of the 6th invention is, in the structure of the 4th or the 5th invention, observes from the length direction of piezoelectrics, and relief portion is formed in can be seen from electrode in the scope of part not forming this electrode.
According to the 6th invention, except the effect of the 4th or the 5th invention, by recessed opening, except electric conductor is relative to except the formation state of electrode, for the part not forming this electrode in piezoelectrics, also easy to its outward appearance carry out visual examination or confirmation (check or confirm electric conductor whether be not attached to there is no the part of electrode and be only correctly formed on electrode), contribute to improving its quality management further.
According to the present invention, provide a kind of piezoelectric body module being configured to the contact can avoided between housing and electric conductor, even if form electric conductor on the outer surface of piezoelectrics, also can prevent the pollution of housing.
Accompanying drawing explanation
Fig. 1 is the exploded perspective view of the piezoelectric transformer of the present embodiment.
Fig. 2 is the stereogram of the completion status of the piezoelectric transformer that Fig. 1 is shown.
Fig. 3 is the partial plan of the housing of Fig. 1.
Fig. 4 is the partial side elevation view of the housing of Fig. 1.
Fig. 5 be illustrate piezoelectric ceramic is accommodated in Fig. 1 housing in after the partial side elevation view of state of coating electrically conductive coating.
Fig. 6 is the partial side elevation view of the piezoelectric transformer of Fig. 2.
Label declaration:
10: piezoelectric transformer (piezoelectric body 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: relief portion; 32: protrude opening; 34: recessed opening.
Embodiment
Hereinafter, with reference to the accompanying drawings of embodiments of the present invention.In addition, below enumerate execution mode piezoelectric body module being applied to piezoelectric transformer and be described, but piezoelectric body 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 the present embodiment, and Fig. 2 is the stereogram of the completion status of this piezoelectric transformer 10.
In addition, this Fig. 1 is the shape in order to more easily understand housing 14, isolates the figure of piezoelectric ceramic 12 from the completion status of Fig. 2.That is, be not on piezoelectric ceramic 12, form conductive film covering (electric conductor) 24 after, piezoelectric ceramic 12 is received in housing, but as described later conductive film covering 24 (Fig. 5 etc.) is formed to the piezoelectric ceramic 12 be accommodated in housing 14.
In addition, this piezoelectric transformer 10 such as the high voltage electric source of the inverter etc. of liquid crystal backlight, utilizes the input of low-voltage to produce high-tension output.
Specifically, 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 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 with the state of the bottom surface side of its housing 14 in the face of the installed surface of the circuit substrate (not shown) of product.
The piezoelectric vibrator of piezoelectric ceramic 12 to such as lead zirconate titanate class pottery (PZT) etc. of the present embodiment polarizes and forms.Shape for this piezoelectric ceramic 12 is not particularly limited, but it is routine as one to enumerate roughly rectangular shape (tabular) herein.
On two in the outer surface of piezoelectric ceramic 12, paired in the thickness direction thereof faces, be formed with primary side electrode (electrode) 12a respectively.Although illustrate only one side in Fig. 1, Fig. 2, the face of its opposition side is also formed with same primary side electrode (electrode) 12a.
In addition, in piezoelectric ceramic 12, be formed with the function of the portions educe drive division of primary side electrode 12a, do not form the function of the portions educe 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 the present embodiment is only formed on a paired in the thickness direction thereof face (one side shown in Fig. 1, Fig. 2).
Primary side electrode 12a and secondary side electrode 12b is such as by using the silk screen printing of metal-to-metal adhesive to be formed on the outer surface of piezoelectric ceramic 12, when observing from the Width (namely substantially vertical with above-mentioned length direction and thickness direction respectively direction) of piezoelectric ceramic 12, formed with the length that the width than this piezoelectric ceramic 12 is slightly short.In addition, primary side electrode 12a is formed with the length of whole length (length direction) the only about half of left and right relative to piezoelectric ceramic 12.
As shown in Figure 1, one end of conductor wire 16,16 (such as gold thread) is welded with respectively in the substantial middle position of primary side electrode 12a, 12a, further, one end of conductor wire 16 (such as gold thread) is also welded with in the substantial middle position of secondary side electrode 12b.
On the other hand, the profile that housing 14 constituent ratio piezoelectric ceramic 12 is large, is formed with the incorporating section 14b of cup-shaped therein.
Specifically, about incorporating section 14b, the bottom surface side of housing 14 is by opening, and the top side (being positioned at below among Fig. 1, Fig. 2) from this bottom surface side towards housing 14 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 is formed as a circle larger than piezoelectric ceramic 12, can be inserted from above-mentioned opening by piezoelectric ceramic 12 in edge-on mode and be accommodated in the 14b of this incorporating section.
In housing 14, be provided with 3 butt 18,18,20 altogether.Two butt 18,18 are wherein primary side terminal, are oppositely disposed respectively with primary side electrode 12a.
These terminals 18,18 insert respectively in protuberance 14a, 14a of housing 14, and observe from Fig. 1, Fig. 2, its end side 18a gives prominence to upward from protuberance 14a.
In each protuberance 14a, be formed with the through hole (being shown in broken lines in the protuberance 14a of the side, front of Fig. 1, Fig. 2) for terminal 18, terminal 18 is towards bending about 90 ° of the length direction (identical with the length direction of piezoelectric ceramic 12) of housing 14.Further, another side 18b of terminal 18 gives prominence to from protuberance 14a towards the length direction of housing 14 respectively.
Remaining terminal 20 is 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, and observe from Fig. 1, Fig. 2, its end side is given prominence to upward.
In addition, another side of the terminal 20 of the present embodiment is embedded in housing 14, but also can give prominence to from the upper surface side of housing 14.
In addition, as shown in Figure 2, under the state that piezoelectric ceramic 12 is accommodated in housing 14, the other end of above-mentioned each conductor wire 16 to be wound around respectively on nigh primary side terminal 18 or secondary side terminal 20 and to weld.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, not shown such as silicon bonding agent is used to be fixed on housing 14 by piezoelectric ceramic 12.Specifically, near above-mentioned protuberance 14a, 14a, be formed with height than this protuberance 14a respectively (from the length that the direction connecting the top surface side of housing 14 and bottom surface side is observed, identical with the Width of piezoelectric ceramic 12) low recess 14c, 14c, fills (or coating) silicon bonding agent and is remained in housing 14 by piezoelectric ceramic 12 in these recesses 14c.
In addition, this silicon bonding agent is made up of following material: piezoelectric ceramic 12 fixing (bonding) also can played suitable elasticity to the moment in housing 14.Therefore, piezoelectric ceramic 12 can vibrate at the internal freedom of housing 14 when its action, and its vibrational energy is absorbed by silicon bonding agent.In addition, if piezoelectric ceramic 12 is fixed in housing 14 by joint (amplitude is the position of the zero) place of the mechanical oscillation that can produce at piezoelectric ceramic 12, then also can apply silicon bonding agent in the position (other the joint such as between primary side electrode 12a and secondary side electrode 12b) beyond this recess 14c.
Herein, on the piezoelectric ceramic 12 of the present embodiment, conductive film covering 24 is formed with along its outer surface.
Observe from the length direction of piezoelectric ceramic 12, this conductive film covering 24 is such as formed in substantial middle part.In addition, conductive film covering 24 be formed as crossing in the outer surface of piezoelectric ceramic 12, along the small end face of its length direction, rap around to two paired in the thickness direction thereof faces, overlapping with primary side electrode 12a (superimposed).That is, conductive film covering 24 is formed as also overlapping with primary side electrode 12a in the face of the unshowned opposition side of Fig. 1, Fig. 2.
As described later, apply aqueous conductive coating paint at the outer surface of piezoelectric ceramic 12 and form conductive film covering 24.Such as the resin and conductive material that comprise volatile solvent are mixed and form this conductive coating paint.In addition, conductive film covering 24 is formed along the small end face of the length direction along piezoelectric ceramic 12, is electrically connected (Fig. 1, Fig. 2) between primary side electrode 12a, 12a.
In addition, for the piezoelectric ceramic 12 observed under the receiving state shown in Fig. 2, this piezoelectric ceramic 12 is embedded in housing 14, and its small end face alongst is not also given prominence to from incorporating section 14b.But the small end face of this piezoelectric ceramic 12 exposes from incorporating section 14b, this small end face can be seen from the top of Fig. 2.
The piezoelectric transformer 10 being accommodated with piezoelectric ceramic 12, with the above-mentioned end side state down of the end side 18a of terminal 18 and terminal 20, uses backflash etc. to be welded on the circuit substrate of the said goods, is arranged on this circuit substrate.
Now, because the variations in temperature (reflux heat) during welding produces the electric charge that thermoelectric effect causes in piezoelectric ceramic 12, this electric charge is consumed mainly through conductive film covering 24.Therefore, it is possible to the deterioration of the piezoelectric ceramic 12 suppressing thermoelectric effect to cause, and the infringement that can prevent circuit block (such as input circuit, output circuit, the control circuit etc.) electric discharge to foregoing circuit substrate and produce.
In addition, the conductive film covering 24 of the present embodiment is installed to after on foregoing circuit substrate at piezoelectric transformer 10 and also continues to play a role, the change of peripheral temperature when working for piezoelectric transformer 10, is also effectively for the measure of thermoelectric effect.
Specifically, conductive film covering 24 is set in following scope: the resistance value of giving between primary side electrode 12a is more than or equal to the resonant resistance value (being preferably its more than 10 times) between this primary side electrode 12a, and is less than or equal to 10% of the insulating resistance value between primary side electrode 12a.
In addition, the resistance value of (adjustment) conductive film covering 24 is managed according to the length (above-mentioned length direction) of the scope of coating electrically conductive coating.Namely, this conductive coating paint has the character determining resistance value (giving the resistance value between primary side electrode 12a) as a whole according to the area of its coating scope, therefore the width (above-mentioned thickness direction) of coating scope is being set to a timing, resistance value can be being determined 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 (crossing over the direction of small end face to dorsal surface from the face of side, front) of piezoelectric ceramic 12, consider minimum range required between connection two primary side electrode 12a to be set to application width (thickness+α of piezoelectric ceramic 12).In addition, when the resistance value obtained when being coated with the conductive coating paint of unit length according to application width being now set to " first unit resistance value (Ω/mm) ", try to achieve overall the given resistance value of conductive film covering 24 (Ω) by " first unit resistance value (Ω/mm) " × " coating length (mm) ".
Thus, if obtain first unit resistance value (Ω/mm) according to the physical property of used conductive coating paint and the application width of necessity, then after this easily can manage the resistance value of conductive film covering 24 by means of only its coating length of adjustment.
But piezoelectric ceramic 12 is being received into formation after in housing 14 by the conductive film covering 24 of the present embodiment.
Specifically, piezoelectric ceramic 12 is configured in the 14b of incorporating section, its small end face exposes from incorporating section 14b, apply above-mentioned aqueous conductive coating paint in this case, the liquid level (such as roughly spherical) of this conductive coating paint is easily attached on incorporating section 14b around near in housing 14, especially between above-mentioned drive division and Power Generation Section border etc., and housing 14 is easily polluted by conductive coating paint.
Therefore, in the housing 14 of the present embodiment, be provided with the relief portion 30 be connected with incorporating section 14b, eliminate easily by position that this conductive coating paint pollutes.
Specifically, except Fig. 1, Fig. 2, as observed shown in Fig. 4 of Fig. 3 of plane graph of substantial middle part and the end view of this substantial middle part of this housing 14 from the length direction of housing 14, the relief portion 30 of the present embodiment is made up of protrusion 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 left from the small end face being formed with conductive film covering 24 respectively, these both sides are protruded opening 32 for a pair and are formed the space larger than the space formed between incorporating section 14b and primary side electrode 12a respectively, avoid the contact with the liquid level of conductive coating paint.
Then, observe from the Width of piezoelectric ceramic 12, recessed opening 34 respectively towards the direction left from the small end face being formed with conductive film covering 24 recessed (Fig. 1, Fig. 4).
Specifically, the recessed opening 34 that these both sides are a pair is formed as height than above-mentioned recess 14c (from the length connecting the upper surface side of housing 14 and the direction of bottom surface side and observe, identical with the Width of piezoelectric ceramic 12) lower, especially, the recessed one-tenth of recessed opening 34 of the present embodiment is low to moderate only about half of left and right for the height of housing 14.Thus, avoid the contact with the liquid level of conductive coating paint, and the rigidity of housing 14 when guaranteeing piezoelectric ceramic 12 action.
In addition, observe from the length direction of piezoelectric ceramic 12, these protrude opening 32 and recessed opening 34 is formed in from being formed with the drive division of 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, be accommodated with piezoelectric ceramic 12 Fig. 5 shown in, the boundary position between these drive division and Power Generation Sections can be observed from outside.
In addition, under the receiving state of the piezoelectric ceramic 12 observed at Fig. 5, above the small end face of piezoelectric ceramic 12, (position near the border between drive division and Power Generation Section) is configured with syringe needle 40, when the aqueous conductive coating paint 22 of the scheduled volume after dripping above-mentioned adjustment from the end of this syringe needle 40, the liquid level of conductive coating paint 22, therefore only contacts with the small end face of piezoelectric ceramic 12 away from housing 14 due to relief portion 30.
Then, about the conductive coating paint 22 be coated on this small end face, heave with roughly spherical after just coating, but time afterwards in solvent evaporates to air, resin and conductive material diffusion.Therefore, the conductive film covering 24 (Fig. 6) connecting primary side electrode 12a, 12a is defined in the scope that should apply above-mentioned conductive coating paint 22 in small end face.
As mentioned above, according to the present embodiment, conductive film covering 24 is formed along the small end face of piezoelectric ceramic 12, even if observe piezoelectric transformer 10 separately, between the primary side electrode 12a of piezoelectric ceramic 12, do not clip miscellaneous part, be in the state utilizing resistance (i.e. conductive film covering 24) to connect.
Thus, when being assembled in product by this piezoelectric transformer 10, suppose that environment temperature changes in its manufacture process, the electric charge produced due to its thermoelectric effect is also consumed, and can not produce infringement to the circuit block of product etc.
In addition, conductive film covering 24 is made up of aqueous conductive coating paint 22, and methods such as oozing drop can be utilized easily to apply.Thus, can automation be realized in the formation of conductive film covering 24, 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 exposed by incorporating section 14b.Namely, apply after piezoelectric ceramic 12 is received in housing 14, with to be received into before housing 14 compared with situation about in advance piezoelectric ceramic 12 being applied, when not worrying arranging other structure members (such as conductor wire 16) on primary side electrode 12a etc., conductive film covering 24 can peel off, and can reliably connect between primary side electrode 12a.
, in the housing 14 of the present embodiment, be provided with relief portion 30 herein, the contact with the liquid level of the conductive coating paint 22 of this coating can be avoided.Thus, even if conductive coating paint 22 to be coated to the small end face of piezoelectric ceramic 12 under above-mentioned receiving state, also can avoid the pollution of housing 14, the unfavorable condition of the circuit block of the product being assembled with piezoelectric transformer 10 etc. can be prevented.As a result, the production efficiency of piezoelectric transformer 10 can be improved, and its reliability can be improved.
In addition, relief portion 30 has protrusion opening 32.Observe from the thickness direction of received piezoelectric ceramic 12, this protrusion opening 32 is formed in the mode protruding upward in the side left from conductive film covering 24 respectively, can make the liquid level of the part that may be close to conductive film covering 24 away from conductive coating paint 22 of housing 14.Thus, can reliably avoid being formed on housing 14 bringing dysgenic unnecessary conductive film covering to foregoing circuit parts etc.
In addition, relief portion 30 has following recessed opening 34: observe on the Width of the piezoelectric ceramic 12 of same storage, recessed on the direction left from conductive film covering 24 respectively.Thus, the liquid level of the part that may be close to conductive film covering 24 that can make housing 14 conductive coating paint 22 further away from each other, can reliably avoid the formation of above-mentioned unnecessary conductive film covering further.
And, by the recessed opening 34 that this is concavely formed, easily conductive film covering 24 is carried out to visual examination or the confirmation (check or confirm whether conductive film covering 24 is correctly formed relative to primary side electrode 12a) of outward appearance relative 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 piezoelectric effect during its action produces vibration; therefore require that housing 14 has the vibration of absorption pressure electroceramics 12 or the function of protection piezoelectric ceramic 12; the position of the rigidity of housing 14 when recessed opening 34 is formed in the action guaranteeing piezoelectric ceramic 12, therefore without detriment to the function of this housing 14.
In addition, by recessed opening 34, except the formation state of conductive film covering 24 relative to the primary side electrode 12a as drive division, namely Power Generation Section is not formed to the part of primary side electrode 12a, also easily visual examination or confirm its outward appearance (check or confirm whether conductive film covering 24 is not attached on this Power Generation Section and is only correctly formed on drive division), contributes to the efficiency improving quality management further.
In addition, conductive film covering 24 resistance value of giving between primary side electrode 12a is more than or equal to the resonant resistance value between this primary side electrode 12a, and is less than or equal to 10% of the insulating resistance value between primary side electrode 12a.
This " resonant resistance value " is equivalent to the minimum resistance between the primary side electrode 12a of used 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 (before forming conductive film covering 24), comprises internal resistance and sheet resistance herein simultaneously.
In addition, the lower limit set of the resistance value between the primary side electrode 12a given by conductive film covering 24 is resonant resistance value, resistance not being established too low, therefore when using piezoelectric transformer 10 (when applying input voltage), by mistake can not carry out dividing potential drop to input voltage.
In addition, the upper limit of the resistance value between the primary side electrode 12a given by conductive film covering 24 controls to 10% of insulating resistance value.This is in view of following aspect: even if merely the upper limit of resistance value be set as " being less than insulating resistance value ", when resistance value between the primary side electrode 12a of reality is too much relative to thermoelectric voltage setting, from the angle of practicality in most cases electric charge all can not disappear (consumption), effectively can not play the effect of actual thermoelectricity countermeasure.As a result, for variations in temperature when being assembled into product, practical thermoelectricity countermeasure can be played.In addition, its normal piezo motion can be ensured when the use of product, and also can play effective thermoelectricity countermeasure for the variations in temperature under environment for use.
The invention is not restricted to above-described embodiment, various change can be carried out in the scope not departing from claim.
Such as, observe from the length direction of piezoelectric ceramic 12, the conductive film covering 24 of above-described embodiment is formed in substantial middle part, but as long as relief portion of the present invention can connect the position between primary side electrode 12a, then also can be formed as being connected with the incorporating section 14b near the terminal 18 of primary side.
In addition, in the above-described embodiments, observe from the thickness direction of received piezoelectric ceramic 12, protrude the side that opening 32 is leaving conductive film covering 24 protruding upward, observe from the Width of received piezoelectric ceramic 12, recessed opening 34 is recessed on the direction leaving conductive film covering 24, but is not necessarily limited to this mode.That is, as long as make housing 14 away from the liquid level of 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 is formed under the state contacted with each primary side electrode 12a.But as long as the resistance value of giving between primary side electrode 12a is in above-mentioned proper range under the state that the outer surface of piezoelectric ceramic 12 forms conductive film covering 24, then conductive film covering 24 can not directly be connected with primary side electrode 12a.
In addition, in the above-described embodiments, describe and be received into the situation forming conductive film covering 24 after in housing 14 at the outer surface of piezoelectric ceramic 12, but also can form conductive film covering 24 being received into the outer surface in advance at piezoelectric ceramic 12 before in housing 14.This is because in this case, when conductive film covering 24 contacts with housing 14, its coating also can be attached on housing 14 and pollute housing 14.
In addition, in the above-described embodiments, the example applying aqueous conductive coating paint 22 at the outer surface of piezoelectric ceramic 12 is described.But, also can paste 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 being specially piezoelectric transformer 10 is illustrated, but piezoelectric body module of the present invention can also be applicable to such as piezo-activator or piezoelectric motors (ultrasonic motor).
In addition, in any of these cases, as described above, following effect is obtained: even if form electric conductor at the outer surface of piezoelectrics, also can prevent the pollution of housing.
Claims (11)
1. a piezoelectric body module, is characterized in that, described piezoelectric body module has:
Polarized piezoelectrics;
Be formed at least two electrodes on the outer surface of described piezoelectrics;
Housing, it receives described piezoelectrics, and has the opening under this receiving state, the outer surface of a part for described piezoelectrics being exposed;
Electric conductor, it is made up of electric conductor, being formed, being interconnected between described electrode giving resistance value between described electrode along the described outer surface exposed by described opening; And
Relief portion, it is connected with described opening, the contact between the described electric conductor on the outer surface exposed described in avoiding and being formed in.
2. piezoelectric body module according to claim 1, is characterized in that,
When forming described electric conductor on the described outer surface exposed under described receiving state, described relief portion avoids the contact between this electric conductor.
3. piezoelectric body module according to claim 1 and 2, is characterized in that,
Described piezoelectrics are configured to roughly rectangular shape, and on the other hand, described electrode is formed on face paired on the thickness direction of these piezoelectrics,
Described relief portion has protrusion opening, observes from this thickness direction, and this protrusion opening protrudes towards the direction leaving described electric conductor.
4. piezoelectric body module according to claim 1 and 2, is characterized in that,
Described piezoelectrics are configured to roughly rectangular shape, and on the other hand, described electrode is formed on face paired on the thickness direction of these piezoelectrics,
Described relief portion has recessed opening, and observe from the Width of the substantially vertical described piezoelectrics of the both sides of the length direction with this thickness direction and described piezoelectrics, this recessed opening is recessed towards the direction leaving described electric conductor.
5. piezoelectric body 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 guaranteeing described piezoelectrics.
6. piezoelectric body module according to claim 4, is characterized in that,
Observe from the length direction of described piezoelectrics, described relief portion is formed in can be seen from described electrode in the scope of part not forming this electrode.
7. piezoelectric body module according to claim 5, is characterized in that,
Observe from the length direction of described piezoelectrics, described relief portion is formed in can be seen from described electrode in the scope of part not forming this electrode.
8. piezoelectric body module according to claim 3, is characterized in that,
Described relief portion also has recessed opening, and observe from the Width of the substantially vertical described piezoelectrics of the both sides of the length direction with this thickness direction and described piezoelectrics, this recessed opening is recessed towards the direction leaving described electric conductor.
9. piezoelectric body module according to claim 8, is characterized in that,
The position of the rigidity of described housing when described recessed opening is recessed into the action guaranteeing described piezoelectrics.
10. piezoelectric body module according to claim 8, is characterized in that,
Observe from the length direction of described piezoelectrics, described relief portion is formed in can be seen from described electrode in the scope of part not forming this electrode.
11. piezoelectric body modules according to claim 9, is characterized in that,
Observe from the length direction of described piezoelectrics, described relief portion is formed in can be seen from described electrode in the scope of part not forming this electrode.
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| JP2010-036821 | 2010-02-23 | ||
| JP2010036821A JP5576143B2 (en) | 2010-02-23 | 2010-02-23 | Piezoelectric module |
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| JP2005278121A (en) * | 2004-03-26 | 2005-10-06 | Murata Mfg Co Ltd | Piezo-electric element and piezo-electric component |
| 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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| JPS5298493A (en) * | 1976-02-13 | 1977-08-18 | Matsushita Electric Ind Co Ltd | Supporting method of piezo-electric transformer |
| JP2000307166A (en) * | 1999-04-21 | 2000-11-02 | Tdk Corp | Piezoelectric transformer and drive stabilizing device thereof |
| JP5352471B2 (en) * | 2007-11-28 | 2013-11-27 | 株式会社タムラ製作所 | Piezoelectric transformer |
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| JP2005278121A (en) * | 2004-03-26 | 2005-10-06 | Murata Mfg Co Ltd | Piezo-electric element and piezo-electric component |
| 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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| JP5576143B2 (en) | 2014-08-20 |
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