JPH0681718B2 - Piezoelectric motion converter - Google Patents
Piezoelectric motion converterInfo
- Publication number
- JPH0681718B2 JPH0681718B2 JP63187165A JP18716588A JPH0681718B2 JP H0681718 B2 JPH0681718 B2 JP H0681718B2 JP 63187165 A JP63187165 A JP 63187165A JP 18716588 A JP18716588 A JP 18716588A JP H0681718 B2 JPH0681718 B2 JP H0681718B2
- Authority
- JP
- Japan
- Prior art keywords
- piezoelectric element
- mover
- leaf spring
- main frame
- expansion
- 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 - Lifetime
Links
- 230000008602 contraction Effects 0.000 claims description 26
- 238000005452 bending Methods 0.000 claims description 5
- 230000005489 elastic deformation Effects 0.000 description 12
- 239000000463 material Substances 0.000 description 10
- 230000036316 preload Effects 0.000 description 6
- 238000006073 displacement reaction Methods 0.000 description 4
- 238000003466 welding Methods 0.000 description 3
- 239000000853 adhesive Substances 0.000 description 2
- 230000001070 adhesive effect Effects 0.000 description 2
- 238000005219 brazing Methods 0.000 description 2
- 239000000919 ceramic Substances 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 239000013585 weight reducing agent Substances 0.000 description 1
- 229910052725 zinc Inorganic materials 0.000 description 1
- 239000011701 zinc Substances 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
- B41J2/22—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective application of impact or pressure on a printing material or impression-transfer material
- B41J2/23—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective application of impact or pressure on a printing material or impression-transfer material using print wires
- B41J2/27—Actuators for print wires
- B41J2/295—Actuators for print wires using piezoelectric elements
Landscapes
- Impact Printers (AREA)
Description
【発明の詳細な説明】 （産業上の利用分野） この発明は、主として印字ヘッドに採用される圧電素子
の運動変換装置に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a motion converting device for a piezoelectric element mainly used in a print head.
（従来の技術） 圧電素子の運動変換装置としては、例えば、すでに同一
出願人によって開発がなされた特願昭63−14019号、特
願昭62−277169号、特願昭62−268496号等に開示された
ものがある。(Prior Art) As a motion converting device for a piezoelectric element, for example, Japanese Patent Application No. 63-14019, Japanese Patent Application No. 62-277169, Japanese Patent Application No. 62-268496 and the like, which have already been developed by the same applicant, are disclosed. Some have been disclosed.
また、このような圧電素子の運動変換装置は、第６図に
示すように、圧電素子１の伸縮方向一端を支持する基部
３を備え、かつ圧電素子１の一側に沿って延在するフレ
ーム２と、前記圧電素子１の伸縮方向他端に配設された
可動子５とに、一対の板ばね6,7の一端部がそれぞれ固
着される。そして、前記圧電素子１の伸縮に基づく前記
両板ばね6,7の各弾性変形部6b,7bの撓みによってこれら
両板ばね6,7の他端に跨って結合された傾動体８を傾動
させるようになっている。また、前記各板ばね6,7の弾
性変形部6b,7bは、その各板幅や板厚が同一で、その各
弾性変形部6b,7bの弾性強度が略同一に構成されてい
る。In addition, as shown in FIG. 6, such a motion converting device for a piezoelectric element is a frame that includes a base portion 3 that supports one end of the piezoelectric element 1 in the expansion / contraction direction, and that extends along one side of the piezoelectric element 1. One end of a pair of leaf springs 6 and 7 is fixed to the movable element 5 disposed on the other end of the piezoelectric element 1 in the expansion and contraction direction. Then, the tilting body 8 connected over the other ends of the leaf springs 6 and 7 is tilted by the bending of the elastically deforming portions 6b and 7b of the leaf springs 6 and 7 due to the expansion and contraction of the piezoelectric element 1. It is like this. The elastically deforming portions 6b and 7b of the leaf springs 6 and 7 have the same plate width and thickness, and the elastically deforming portions 6b and 7b have substantially the same elastic strength.
（発明が解決しようとする課題） 前記したように構成される運動変換装置においては、圧
電素子１の伸びに基づく可動子５の変位力が同可動子５
側の板ばね７に直接に作用するとともに、フレーム２側
の板ばね６の弾性変形部6bよりも可動子５側の板ばね７
の弾性変形部7bが大きく撓む。このようなことから、可
動子５側の板ばね７の弾性変形部7bに生じる応力はフレ
ーム２側の板ばね６の弾性変形部6bに生じる応力よるも
大きくなる。そして、両板ばね6,7のうち、可動子５側
の板ばね７の弾性変形部7bの疲労度が大きく、同板ばね
７がその弾性変形部7bにおいて座屈されたりあるいは折
損されるという問題点がある。(Problems to be Solved by the Invention) In the motion conversion device configured as described above, the displacement force of the mover 5 based on the expansion of the piezoelectric element 1 causes the mover 5 to move.
Side leaf spring 7 and the leaf spring 7 on the movable element 5 side of the elastically deforming portion 6b of the leaf spring 6 on the frame 2 side.
The elastically deforming portion 7b is largely bent. For this reason, the stress generated in the elastically deformed portion 7b of the leaf spring 7 on the mover 5 side is larger than the stress generated in the elastically deformed portion 6b of the leaf spring 6 on the frame 2 side. Of the two leaf springs 6 and 7, the elastic deformation portion 7b of the leaf spring 7 on the mover 5 side has a large fatigue level, and the leaf spring 7 is buckled or broken at the elastic deformation portion 7b. There is a problem.
この発明の目的は、前記した問題点に鑑み、可動子５側
の板ばね７の弾性変形部7bに生じる座屈や折損を防止し
て耐久性の向上を図ることができる圧電素子の運動変換
装置を提供することである。In view of the above-mentioned problems, an object of the present invention is to prevent the buckling and breakage of the elastically deforming portion 7b of the leaf spring 7 on the mover 5 side and improve the durability of the piezoelectric element. It is to provide a device.
（課題を解決するための手段） 前記目的を達成するために、この発明は圧電素子の伸縮
方向一端を支持する基部を備え、かつ圧電素子の一側に
沿って延在するメインフレームと、前記圧電素子の伸縮
方向他端に配設された可動子とに、一対の板ばねの一端
部をそれぞれ固着し、前記圧電素子の伸縮に基づく前記
両板ばねの各弾性変形部の撓みによってこれら両板ばね
の他端に結合された傾動体を傾動させるようになした運
動変換装置であって、前記メインフレーム側の板ばねの
弾性変形部の弾性強度よりも前記可動子側の板ばねの弾
性変形部の弾性強度を高めた構成にしたものである。(Means for Solving the Problems) In order to achieve the above object, the present invention includes a main frame that supports one end of a piezoelectric element in an expansion / contraction direction, and a main frame that extends along one side of the piezoelectric element, One ends of a pair of leaf springs are respectively fixed to a mover disposed at the other end of the piezoelectric element in the expansion / contraction direction, and the elastic deformation portions of both leaf springs are bent by the expansion / contraction of the piezoelectric element. A motion conversion device for tilting a tilting body coupled to the other end of a leaf spring, wherein the elasticity of the leaf spring on the mover side is higher than the elastic strength of an elastically deforming portion of the leaf spring on the main frame side. This is a structure in which the elastic strength of the deformed portion is increased.
（作 用） 前記したように構成される圧電素子の運動変換装置にお
いて、圧電素子の伸縮に基づいて変位される可動子の変
位力を受けて同可動子側の板ばねが、メインフレーム側
の板ばねに沿って押上げられると、両板ばねがその各弾
性変形部において湾曲状に弾性変形して撓むとともに、
可動子側の板ばねがメインフレーム側の板ばねに向けて
大きく撓むことで、両板ばねの他端部に結合された傾動
体の部分に回転モーメントが生じ、これによって、傾動
体が傾動される。(Operation) In the motion converting device for a piezoelectric element configured as described above, the leaf spring on the side of the mover receives the displacement force of the mover that is displaced based on the expansion and contraction of the piezoelectric element, When the leaf springs are pushed up along the leaf springs, both leaf springs elastically deform and bend in the elastically deforming portions,
When the leaf spring on the mover side largely bends toward the leaf spring on the main frame side, a rotational moment is generated in the tilting body connected to the other end of both leaf springs, which causes the tilting body to tilt. To be done.
特に、前記メインフレーム側の板ばねの弾性変形部の弾
性強度よりも可動子側の板ばねの弾性変形部の弾性強度
を高めてあるから、その弾性強度を高める分だけ、同可
動子側の板ばねの弾性変形部の疲労度を小さく抑えるこ
とができる。In particular, since the elastic strength of the elastically deformed portion of the leaf spring on the mover side is made higher than the elastic strength of the elastically deformed portion of the leaf spring on the main frame side, the elastic strength of the mover side is increased as much as the elastic strength. The degree of fatigue of the elastically deformed portion of the leaf spring can be suppressed to a low level.
（実施例） 以下、この発明の一実施例を第１図〜第５図に従って説
明する。(Embodiment) An embodiment of the present invention will be described below with reference to FIGS.
この実施例では印字ヘッドに採用したものを例示するも
のであって、第２図と第３図において、電圧の印加によ
って伸縮する圧電素子１は、積層状をなす圧電セラミッ
クより構成されている。In this embodiment, a print head is used as an example. In FIGS. 2 and 3, the piezoelectric element 1 which expands and contracts by applying a voltage is composed of a laminated piezoelectric ceramic.
前記圧電素子１を支持するためのメインフレーム２は、
その圧電素子１の伸縮方向とほぼ平行して延在する縦長
四角形で所定板厚の金属板より構成されている。このメ
インフレーム２の一端部には圧電素子１の伸縮方向一端
（下端）を後述する温度補償材12及び予圧部材13を介し
て支持するための基部３が横方向に突設されている。ま
た、前記メインフレーム２の両側面には、圧電素子１の
リード線14を案内するための案内溝2aや、重量軽減のた
めの凹部2bが形成されている。The main frame 2 for supporting the piezoelectric element 1 is
The piezoelectric element 1 is a vertically long quadrangle extending substantially parallel to the expansion / contraction direction and is made of a metal plate having a predetermined plate thickness. A base 3 for supporting one end (lower end) of the piezoelectric element 1 in the expansion / contraction direction in the lateral direction is provided at one end of the main frame 2 via a temperature compensating material 12 and a preloading member 13 which will be described later. Further, guide grooves 2a for guiding the lead wires 14 of the piezoelectric element 1 and recesses 2b for reducing the weight are formed on both side surfaces of the main frame 2.
前記圧電素子１の伸縮方向他端（上端）には前記メイン
フレーム２の立上り部の上端部と対向した状態におい
て、可動子５が配設されている。前記可動子５とメイン
フレーム２との対向面には、一対の板ばね6,7がその一
端部においてろう付けによって固着されている。前記両
板ばね6,7の板幅はメインフレーム２並びに可動子５の
板厚よりも所定量だけ幅広に形成され、各板ばね6,7の
幅方向両側縁がメインフレーム２並びに可動子５の板厚
面よりそれで突出した状態でろう付けされることで、メ
インフレーム２並びに可動子５に対する各板ばね6,7の
固着力が高められている。さらに、前記両板ばね6,7
は、所定の隙間を隔てて対向するとともに、メインフレ
ーム２及び可動子５の上端面より圧電素子１の伸縮方向
に所定長さだけ延出されている。そして、両板ばね6,7
の他端部（延出端部）には傾動体８が両板ばね6,7と一
体に結合された状態で形成されている。また、前記両板
ばね6,7の対向面反対側には、前記メインフレーム２及
び可動子５の上端面から傾動体８の下端部にわたる範囲
において、凹部6a,7aがそれぞれ形成され、これによっ
て薄肉部とされた部分をそれぞれ弾性変形部6b,7bとし
ている。さらに、可動子５側に固着された板ばね７の弾
性変形部7bの板厚t2は、メインフレーム２側に固着され
た板ばね６の弾性変形部6bの板厚t1よりも厚肉に設定さ
れており、これによって、メインフレーム２側の板ばね
６の弾性変形部6aの弾性強度よりも可動子５側の板ばね
７の弾性変形部7aの弾性強度が高められている。A mover 5 is arranged at the other end (upper end) of the piezoelectric element 1 in the expansion / contraction direction so as to face the upper end of the rising portion of the main frame 2. A pair of leaf springs 6 and 7 are fixed to the facing surfaces of the mover 5 and the main frame 2 by brazing at one end thereof. The plate widths of the both leaf springs 6 and 7 are formed wider than the plate thicknesses of the main frame 2 and the mover 5 by a predetermined amount, and both side edges of the leaf springs 6 and 7 in the width direction are the main frame 2 and the mover 5. By being brazed in such a state that it projects from the plate thickness surface, the fixing force of each plate spring 6, 7 to the main frame 2 and the mover 5 is increased. Further, the both leaf springs 6, 7
Are opposed to each other with a predetermined gap therebetween, and extend from the upper end surfaces of the main frame 2 and the mover 5 for a predetermined length in the expansion / contraction direction of the piezoelectric element 1. And both leaf springs 6,7
A tilting body 8 is formed at the other end portion (extending end portion) of the above in a state of being integrally connected to both the leaf springs 6 and 7. Further, recesses 6a and 7a are formed on the opposite sides of the leaf springs 6 and 7 opposite to each other in the range from the upper end surfaces of the main frame 2 and the mover 5 to the lower end portion of the tilting body 8, respectively. The thin portions are elastically deformable portions 6b and 7b, respectively. Further, the plate thickness t2 of the elastically deforming portion 7b of the plate spring 7 fixed to the mover 5 side is set to be thicker than the plate thickness t1 of the elastic deforming portion 6b of the plate spring 6 fixed to the main frame 2 side. As a result, the elastic strength of the elastically deformable portion 7a of the leaf spring 7 on the mover 5 side is higher than that of the elastically deformable portion 6a of the leaf spring 6 on the main frame 2 side.
前記傾動体８には、前記両板ばね6,7の配置方向に平行
してアーム取付溝8aが凹設されており、このアーム取付
溝8aには傾動アーム10がその基部において挿入されかつ
ろう付けによって固着されている。前記傾動アーム10の
先端部には切欠き状のワイヤ取付溝10aが形成され、こ
のワイヤ取付溝10aには、印字ワイヤ11の基端部が挿入
されかつろう付けによって固着されている。なお、前記
傾動体８は、第２図に示すように、両板ばね6,7の幅方
向両側部に対する部分が切欠き状に削除されており、軽
量化が図られている。さらに、傾動アーム10には軽量化
のための大小の貫通孔９が適宜に貫設されている。The tilting body 8 is provided with an arm mounting groove 8a parallel to the arrangement direction of the leaf springs 6 and 7, and the tilting arm 10 is inserted into the arm mounting groove 8a at its base. It is fixed by attachment. A notch-shaped wire mounting groove 10a is formed at the tip of the tilting arm 10, and a proximal end portion of the printing wire 11 is inserted into the wire mounting groove 10a and fixed by brazing. As shown in FIG. 2, the tilting body 8 has a notched portion at both sides of the leaf springs 6 and 7 in the width direction, so that the weight can be reduced. Further, the tilting arm 10 is appropriately provided with large and small through holes 9 for weight reduction.
前記メインフレーム２の基部３にはサブフレーム４がそ
の一端部において一体に形成されている。そして、サブ
フレーム４は、圧電素子１の他側（メインフレーム２と
反対側）に沿ってかつ前記可動子５に対向する位置まで
延出されている。A subframe 4 is integrally formed at one end of the base 3 of the main frame 2. The sub-frame 4 extends along the other side of the piezoelectric element 1 (the side opposite to the main frame 2) and to a position facing the mover 5.
前記サブフレーム４の延出端部と可動子５との間には圧
電素子１の伸縮に基づいて、その伸縮方向と平行に可動
子５を案内するための四節の平行リンク機構16が配設さ
れている。この平行リンク機構16は、第５図に示すよう
に、一枚の弾性変形可能な板ばね材をプレスの打抜き加
工並びに折曲げ加工することで形成された一対のリンク
プレート17と、これら両リンクプレート17を一体に結合
している結合部26を主体として構成されている。A four-node parallel link mechanism 16 for guiding the mover 5 in parallel with the extension and contraction direction of the piezoelectric element 1 is arranged between the extension end of the sub-frame 4 and the mover 5. It is set up. As shown in FIG. 5, the parallel link mechanism 16 includes a pair of link plates 17 formed by stamping and bending a single elastically deformable leaf spring material, and a pair of these link plates 17. The connecting portion 26 that integrally connects the plates 17 is mainly configured.
一対のリンクプレート17は、圧電素子１の伸縮方向と平
行する縦リンク部18,19と、これら両縦リンク部18,19の
間に弾性変形可能なヒンジ部22,23,24,25をもって架設
された横リンク部20,21とをそれぞれ備えて四節の平行
リンクをなしている。そして、両リンクプレート17の各
一方の縦リンク部18は、サブフレーム４の両側面にスポ
ット溶接等によって固着され、各他方の縦リンク部19
は、可動子５の両側面にそれぞれスポット溶接等によっ
て固着されている。さらに、可動子５の両側面に固着さ
れた各縦リンク部19の先端に跨って結合部26が一体に形
成され、この結合部26は可動子５の上端面に所定隙間を
隔てて配置される。The pair of link plates 17 are installed with vertical link portions 18, 19 parallel to the expansion and contraction direction of the piezoelectric element 1 and with elastically deformable hinge portions 22, 23, 24, 25 between these vertical link portions 18, 19. The horizontal links 20 and 21 are provided to form a four-bar parallel link. Each one of the vertical link portions 18 of the two link plates 17 is fixed to both side surfaces of the sub-frame 4 by spot welding or the like, and each of the other vertical link portions 19 is fixed.
Are fixed to both side surfaces of the mover 5 by spot welding or the like. Further, a joint portion 26 is integrally formed over the tips of the vertical link portions 19 fixed to both side surfaces of the mover 5, and the joint portion 26 is arranged on the upper end surface of the mover 5 with a predetermined gap. It
また、この実施例において、前記各一方の縦リンク部18
の下部には、連結プレート30がその一端部において一体
に形成されている。前記各連結プレート30は前記メイン
フレーム２の側面まで延出されている。さらに、各連結
プレート30の両端部はメインフレーム２とサブフレーム
４との側面にそれぞれスポット溶接等によって固着され
ている。これによってメインフレーム２に対しサブフレ
ーム４が平行に保たれるとともに、各フレーム2,4の剛
性が高められている。Further, in this embodiment, each of the vertical link portions 18
A connecting plate 30 is integrally formed at the lower part of the one end thereof. Each of the connection plates 30 extends to the side surface of the main frame 2. Further, both ends of each connecting plate 30 are fixed to the side surfaces of the main frame 2 and the sub frame 4 by spot welding or the like. As a result, the sub-frame 4 is kept parallel to the main frame 2 and the rigidity of each frame 2, 4 is enhanced.
また、この実施例において、前記リンクプレート17並び
に連結プレート30が配置される部位において、そのプレ
ートの厚さに相当する分だけメインフレーム2,サブフレ
ーム４及び可動子５の板厚が軽減されており、これによ
ってメインフレーム２及びサブフレーム４の板厚内にお
いてリンクプレート17及び連結プレート30が組付けら
れ、装置の小型化が図られている。さらに、リンクプレ
ート17の各ヒンジ部22〜25及び各横リンク部20,21が配
置される部位において、前記各ヒンジ部及び各横リンク
部がサブフレーム４の側面に接触することがないように
同サブフレーム４の延出端部には薄肉部4aが形成されて
いる。Further, in this embodiment, the plate thicknesses of the main frame 2, the sub-frame 4 and the mover 5 are reduced by the amount corresponding to the thickness of the plate where the link plate 17 and the connecting plate 30 are arranged. As a result, the link plate 17 and the connecting plate 30 are assembled within the plate thickness of the main frame 2 and the sub frame 4, and the size of the device is reduced. Further, at the portion where the hinge portions 22 to 25 and the horizontal link portions 20 and 21 of the link plate 17 are arranged, the hinge portions and the horizontal link portions are prevented from coming into contact with the side surface of the subframe 4. A thin portion 4a is formed at the extending end of the subframe 4.
前記サブフレーム４と可動子５との間に前記リンクプレ
ート17及び連結プレート30が組付けられた後、メインフ
レーム２の基部３と可動子５との間に、圧電素子１及び
温度補償材12が予圧部材13によって所定圧力だけ予圧さ
れた状態で組付けられる。予圧部材13は上板13aと両側
板13bとを備えて逆Ｕ字状に形成され、前記基部３の上
面に跨って上下動自在に嵌込まれる。一方、圧電素子１
の伸縮方向一端（下端）面には、予め温度補償材12が接
着剤によって固着される。そして温度補償材12の下面を
前記予圧部材13の上板13a上面に当接させるとともに、
予圧部材13を押上げながら圧電素子１の他端面を可動子
５の下面に所定荷重で圧接させた状態のもとで、前記予
圧部材13の両側板13bを前記基部３の両側面にスポット
溶接によって固着することで前記圧電素子１が組付けら
れる。After the link plate 17 and the connecting plate 30 are assembled between the sub-frame 4 and the mover 5, the piezoelectric element 1 and the temperature compensating material 12 are provided between the base 3 of the main frame 2 and the mover 5. Is assembled in a state of being preloaded by the preload member 13 by a predetermined pressure. The preload member 13 has an upper plate 13a and both side plates 13b, is formed in an inverted U shape, and is vertically movably fitted over the upper surface of the base portion 3. On the other hand, the piezoelectric element 1
A temperature compensating material 12 is preliminarily fixed to one end (lower end) surface in the expansion / contraction direction by an adhesive. Then, the lower surface of the temperature compensation member 12 is brought into contact with the upper surface of the upper plate 13a of the preload member 13,
While pushing up the preload member 13, while pressing the other end surface of the piezoelectric element 1 against the lower surface of the mover 5 with a predetermined load, both side plates 13b of the preload member 13 are spot welded to both side surfaces of the base portion 3. The piezoelectric element 1 is assembled by being fixed by.
また、前記温度補償材12は、圧電素子１の負の温度線膨
脹率特性とは逆の正の温度線膨脹率特性を有する材料、
例えば亜鉛材やアルミ材によって構成されている。そし
て、周囲の温度変化による圧電素子１の伸縮を、温度補
償材12の上下方向の伸びによって修正し、圧電素子１の
上面高さを常に一定に保つようになっている。In addition, the temperature compensating material 12 is a material having a positive temperature linear expansion coefficient characteristic opposite to the negative temperature linear expansion coefficient characteristic of the piezoelectric element 1.
For example, it is made of a zinc material or an aluminum material. The expansion and contraction of the piezoelectric element 1 due to the ambient temperature change is corrected by the vertical expansion of the temperature compensating material 12 so that the upper surface height of the piezoelectric element 1 is always kept constant.
なお、可動子５下面と圧電素子１の伸縮方向他端面との
相互の接触面、並びに、温度補償材12下面と予圧部材13
の上板13a上面との相互の接触面は必要に応じて接着剤
によって接着される。The lower surface of the movable element 5 and the other end surface of the piezoelectric element 1 in the expansion / contraction direction, the lower surface of the temperature compensating member 12, and the preload member 13 are in contact with each other.
The mutual contact surface with the upper surface of the upper plate 13a is adhered with an adhesive as needed.
また、この実施例において、可動子５の下部の幅方向両
縁部には切欠き状の凹部5aがそれぞれ形成され、これに
よって幅が狭められた部分を弾性伸縮部5bとしている。
さらに、前記可動子５の弾性伸縮部5bは板ばね７の弾性
変形部7bよりも剛性が高くかつ圧電素子１の伸縮方向に
微量に弾性伸縮可能に形成されている。そして圧電素子
１の伸縮に基づく可動子５の所定の変位量は確保される
とともに、圧電素子１に対し電圧の印加が断たれて圧電
素子１が収縮するときには、可動子５の弾性伸縮部5bが
微量に伸びることで、圧電素子１に作用する引張力が軽
減されるようになっている。そして、引張力にもろい特
性を有する圧電セラミックによって圧電素子１を構成し
た場合においても、その圧電素子１の損傷を防止するよ
うになっている。In addition, in this embodiment, notched recesses 5a are formed on both widthwise edges of the lower part of the mover 5, and the portion whose width is narrowed by this is used as the elastic expansion / contraction part 5b.
Further, the elastic expansion / contraction part 5b of the mover 5 has higher rigidity than the elastic deformation part 7b of the leaf spring 7 and is elastically expandable / contractible in a small amount in the expansion / contraction direction of the piezoelectric element 1. Then, a predetermined amount of displacement of the mover 5 based on the expansion and contraction of the piezoelectric element 1 is secured, and when the piezoelectric element 1 contracts due to the interruption of the voltage application to the piezoelectric element 1, the elastic expansion / contraction portion 5b of the mover 5 is reduced. The tensile force acting on the piezoelectric element 1 is reduced due to the small amount of the extension. Even when the piezoelectric element 1 is made of a piezoelectric ceramic having a brittle characteristic, the piezoelectric element 1 is prevented from being damaged.
上述したように構成されるこの実施例において、圧電素
子１の両電極間に電圧が印加されると、圧電素子１は、
その積層方向、すなわち、第３図において矢印Ｘ方向に
所定長さだけ伸び、これに基づいて可動子５が変位され
る。すると、可動子５の変位力を受けて可動子５側の板
ばね７が、メインフレーム２側の板ばね６に沿って押上
げられ、両板ばね6,7がその各弾性変形部6b,7bにおいて
湾曲状に撓む、特に可動子５側の板ばね７の弾性変形部
7bがメインフレーム２側の板ばね６に向けて大きく撓む
ことで、第３図において矢印Ｐ方向に回転モーメントが
生じ、これによって、傾動体８が傾動される。In this embodiment configured as described above, when a voltage is applied between both electrodes of the piezoelectric element 1, the piezoelectric element 1
It extends in the stacking direction, that is, in the direction of arrow X in FIG. 3 by a predetermined length, and the mover 5 is displaced based on this. Then, the leaf spring 7 on the mover 5 side is pushed up along the leaf spring 6 on the main frame 2 side by receiving the displacement force of the mover 5, and the leaf springs 6 and 7 are elastically deformed by the elastic deformation portions 6b and 6b. 7b is bent in a curved shape, in particular, an elastically deformed portion of the leaf spring 7 on the mover 5 side.
When 7b largely bends toward the leaf spring 6 on the main frame 2 side, a rotational moment is generated in the direction of arrow P in FIG. 3, whereby the tilting body 8 is tilted.
さて、前記可動子５側に固着された板ばね７の弾性変形
部7bの板厚t2は、メインフレーム２側に固着された板ば
ね６の弾性変形部6bの板厚t1よりも厚肉に設定されてお
り、これによって、メインフレーム２側の板ばね６の弾
性変形部6aの弾性強度よりも可動子５側の板ばね７の弾
性変形部7aの弾性強度が高められている。このため、可
動子５側の板ばね７の弾性変形部7bの弾性強度を高めた
分だけ、その弾性変形部7bの繰返しの弾性変形による疲
労度を小さく押えることができ、可動子５側の板ばね７
の弾性変形部7bにおける座屈や折損を積極的に防止する
ことができる。Now, the plate thickness t2 of the elastically deforming portion 7b of the plate spring 7 fixed to the mover 5 side is thicker than the plate thickness t1 of the elastic deforming portion 6b of the plate spring 6 fixed to the main frame 2 side. The elastic strength of the elastically deforming portion 7a of the leaf spring 7 on the mover 5 side is set higher than that of the elastically deforming portion 6a of the leaf spring 6 on the main frame 2 side. For this reason, the degree of fatigue due to repeated elastic deformation of the elastically deforming portion 7b can be suppressed to a small extent by the amount by which the elastic strength of the elastically deforming portion 7b of the leaf spring 7 on the moving element 5 side is increased. Leaf spring 7
Buckling and breakage of the elastically deforming portion 7b can be positively prevented.
また、この実施例において、前記圧電素子１の伸びに基
づいて可動子５が変位されるときには、四節の平行リン
ク機構16を構成している各リンクプレート17によって可
動子５が圧電素子１の伸縮方向と平行に案内される。こ
のため、可動子５の傾きが原因となる両板ばね6,7の撓
み量の不足が防止されることから、傾動体８を所定の傾
動角度位置まで傾動させることができる。そして、傾動
体８先端の印字ワイヤ11が所定数の案内部材15に案内さ
れた状態で、その先端が印字位置まで確実に前進され
る。Further, in this embodiment, when the mover 5 is displaced based on the expansion of the piezoelectric element 1, the mover 5 is moved by the link plates 17 constituting the four-bar parallel link mechanism 16. Guided parallel to the direction of expansion and contraction. Therefore, it is possible to prevent the bending amount of both leaf springs 6 and 7 from being insufficient due to the inclination of the mover 5, so that the tilting body 8 can be tilted to a predetermined tilting angle position. Then, with the print wire 11 at the tip of the tilting body 8 being guided by the predetermined number of guide members 15, the tip is reliably advanced to the printing position.
なお、前述した実施例においては、メインフレーム２側
の板ばね６の弾性変形部6bの板厚t1よりも可動子５側の
板ばね７の弾性変形部7bの板厚t2を厚肉に設定して、同
弾性変形部7bの弾性強度を高めたが、これに限るもので
はない。例えば、両板ばね6,7の各弾性変形部6b,7bの板
厚は同一とし、可動子５側の板ばね７の弾性変形部7bの
板幅を幅広にして、メインフレーム２側の板ばね６の弾
性変形部6bの弾性強度よりも可動子５側の板ばね７の弾
性変形部7bの弾性強度を高めることもできる。さらに、
両板ばね6,7の各弾性変形部6b,7bの板厚や板幅は同一と
し、可動子５側の板ばね７をメインフレーム２側の板ば
ね６よりも剛性の高いばね材より構成することで、フレ
ーム２側の板ばね６の弾性変形部6bの弾性強度よりも可
動子５側の板ばね７の弾性変形部7bの弾性強度を高める
ことも可能である。In the above-described embodiment, the plate thickness t2 of the elastic deformation portion 7b of the leaf spring 7 on the mover 5 side is set to be thicker than the plate thickness t1 of the elastic deformation portion 6b of the leaf spring 6 on the main frame 2 side. Then, the elastic strength of the elastically deformable portion 7b is increased, but the invention is not limited to this. For example, the elastically deforming portions 6b and 7b of both leaf springs 6 and 7 have the same plate thickness, and the elastically deforming portion 7b of the leaf spring 7 on the mover 5 side is widened to a plate on the main frame 2 side. The elastic strength of the elastically deformable portion 7b of the leaf spring 7 on the mover 5 side can be increased more than the elastic strength of the elastically deformable portion 6b of the spring 6. further,
The elastically deforming portions 6b and 7b of both leaf springs 6 and 7 have the same thickness and width, and the leaf spring 7 on the mover 5 side is made of a spring material having higher rigidity than the leaf spring 6 on the main frame 2 side. By doing so, the elastic strength of the elastically deformable portion 7b of the leaf spring 7 on the mover 5 side can be made higher than the elastic strength of the elastically deformable portion 6b of the leaf spring 6 on the frame 2 side.
（発明の効果） 以上述べたように、この発明によれば、圧電素子の伸縮
に基づいて可動子を変位させ、メインフレームと可動子
との相互に一端部が固着された一対の板ばねを、その弾
性変形部において撓ませることで、これら両板ばねの他
端部に結合された傾動体を傾動させるようにした圧電素
子の運動変換装置において、特に、メインフレーム側の
板ばねの弾性変形部の弾性強度よりも可動子側の板ばね
の弾性変形部の弾性強度を高めてあるから、その弾性強
度を高めた分だけ、可動子側の板ばねの弾性変形部の疲
労度を小さく抑えることができる。この結果、可動子側
の板ばねの弾性変形部における座屈や折損を積極的に防
止することができ耐久性の向上を図ることができるとい
う効果がある。(Effects of the Invention) As described above, according to the present invention, the movable element is displaced based on the expansion and contraction of the piezoelectric element, and the pair of leaf springs having one end fixed to the main frame and the movable element are provided. In a motion converting device for a piezoelectric element in which a tilting body coupled to the other ends of these leaf springs is tilted by bending at the elastically deforming portion, particularly, elastic deformation of the leaf spring on the main frame side is performed. Since the elastic strength of the elastic deformation portion of the leaf spring on the mover side is higher than the elastic strength of the portion, the fatigue degree of the elastic deformation portion of the leaf spring on the mover side is suppressed to a small extent by the increase in the elastic strength. be able to. As a result, there is an effect that it is possible to positively prevent buckling and breakage in the elastically deforming portion of the leaf spring on the mover side and improve durability.
図面の第１図〜第５図はこの発明の一実施例を示すもの
で、第１図は印字ヘッドに作用される圧電素子の運動変
換装置の要部を拡大して示す側面図、第２図は同じく運
動変換装置全体を示す斜視図、第３図は同じく側面図、
第４図は第３図のIV−IV線断面図、第５図は四節の平行
リンク機構を示す斜視図である。第６図は先行技術のも
のを示す側面図である。 １……圧電素子 ２……メインフレーム ５……可動子 6,7……板ばね 6b,7b……弾性変形部 ８……傾動体1 to 5 of the drawings show an embodiment of the present invention, and FIG. 1 is an enlarged side view showing a main part of a motion converting device for a piezoelectric element which acts on a print head. FIG. 3 is a perspective view showing the whole motion converting device, FIG. 3 is a side view showing the same,
FIG. 4 is a sectional view taken along line IV-IV in FIG. 3, and FIG. 5 is a perspective view showing a parallel link mechanism with four joints. FIG. 6 is a side view showing the prior art. 1 ... Piezoelectric element 2 ... Main frame 5 ... Mover 6,7 ... Leaf springs 6b, 7b ... Elastic deformation part 8 ... Tilt body
Claims (1)
備え、かつ圧電素子の一側に沿って延在するメインフレ
ームと、前記圧電素子の伸縮方向他端に配設された可動
子とに、一対の板ばねの一端部をそれぞれ固着し、前記
圧電素子の伸縮に基づく前記両板ばねの各弾性変形部の
撓みによってこれら両板ばねの他端に結合された傾動体
を傾動させるようになした運動変換装置であって、 前記メインフレーム側の板ばねの弾性変形部の弾性強度
よりも前記可動子側の板ばねの弾性変形部の弾性強度を
高めたことを特徴とする圧電素子の運動変換装置。1. A main frame having a base portion for supporting one end of the piezoelectric element in the expansion / contraction direction and extending along one side of the piezoelectric element, and a mover arranged at the other end of the piezoelectric element in the expansion / contraction direction. In addition, one end of each of the pair of leaf springs is fixed, and the tilting body coupled to the other ends of the leaf springs is tilted by the bending of the elastically deforming portions of the leaf springs due to expansion and contraction of the piezoelectric element. A piezoelectric element, characterized in that the elastic strength of the elastically deforming portion of the leaf spring on the mover side is higher than the elastic strength of the elastically deforming portion of the leaf spring on the main frame side. Motion converter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63187165A JPH0681718B2 (en) | 1988-07-27 | 1988-07-27 | Piezoelectric motion converter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63187165A JPH0681718B2 (en) | 1988-07-27 | 1988-07-27 | Piezoelectric motion converter |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0236951A JPH0236951A (en) | 1990-02-06 |
| JPH0681718B2 true JPH0681718B2 (en) | 1994-10-19 |
Family
ID=16201257
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63187165A Expired - Lifetime JPH0681718B2 (en) | 1988-07-27 | 1988-07-27 | Piezoelectric motion converter |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0681718B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2965763B2 (en) * | 1991-10-09 | 1999-10-18 | 富士通株式会社 | Holding structure of piezoelectric actuator |
| JP4895441B2 (en) * | 2001-07-27 | 2012-03-14 | みかど化工株式会社 | Agricultural multi-film |
-
1988
- 1988-07-27 JP JP63187165A patent/JPH0681718B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0236951A (en) | 1990-02-06 |
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