JPH0236951A - Motion converter of piezoelectric element - Google Patents
Motion converter of piezoelectric elementInfo
- Publication number
- JPH0236951A JPH0236951A JP63187165A JP18716588A JPH0236951A JP H0236951 A JPH0236951 A JP H0236951A JP 63187165 A JP63187165 A JP 63187165A JP 18716588 A JP18716588 A JP 18716588A JP H0236951 A JPH0236951 A JP H0236951A
- Authority
- JP
- Japan
- Prior art keywords
- elastic deformation
- main frame
- piezoelectric element
- elastic
- deformation part
- 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.)
- Granted
Links
- 230000005489 elastic deformation Effects 0.000 claims abstract description 37
- 230000008602 contraction Effects 0.000 claims abstract description 26
- 238000006243 chemical reaction Methods 0.000 claims description 5
- 238000005452 bending Methods 0.000 claims description 4
- 238000005219 brazing Methods 0.000 abstract description 3
- 238000000034 method Methods 0.000 abstract 1
- 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 4
- 239000000853 adhesive Substances 0.000 description 2
- 230000001070 adhesive effect Effects 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 239000000919 ceramic Substances 0.000 description 2
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 239000013585 weight reducing agent Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
- 230000000630 rising effect Effects 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
Abstract
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。DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a motion converting device for a piezoelectric element mainly employed 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６２−２６８
４９６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, the patent application No. 63-14019 developed by the same applicant is known.
No., Patent Application No. 1982-277169, Patent Application No. 1982-268
There are some disclosed in No. 496 and the like.
また、このような圧電素子の運動変換装置は、第６図に
承りように、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、萌記圧電索−Ｆ 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。Further, as shown in FIG. 6, such a motion conversion device for a piezoelectric element includes a base 3 that supports one end of the piezoelectric element 1 in the expansion and contraction direction, and a frame that extends along one side of the piezoelectric element 1. One end portion of a pair of leaf springs 6 and 7 is fixed to the movable member 5 disposed at the other end of the Moeki piezoelectric cable F 1 in the direction of expansion and contraction.
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−に構成
されている。The both leaf springs 6 based on the expansion and contraction of the piezoelectric element 1
．． The deflection of each elastic deformation portion 6b, 7b causes a tilting body 8 coupled to straddle the other ends of both leaf springs 6, 7 to tilt. Further, the elastic deformation portions 6b and 7b of each of the leaf springs 6 and 7 have the same width and thickness,
The elastic strengths of the elastic deformation portions 6b and 7b are substantially the same.
（発明が解決しＪ、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ｆ１の伸びに基づく可動Ｆ５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ｆ５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
力よりも大きくなる。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７ ｂ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。(Problem to be Solved by the Invention) In the motion conversion device configured as described above, the displacement force of the movable element F5 based on the elongation of the piezoelectric element f1 is
It acts directly on the leaf spring 7 on the side, and the elastic deformation part 7b of the leaf spring 7 on the movable element 5 side is bent more than the elastic deformation part 6b of the leaf spring 6 on the frame 2 side. For this reason, the stress generated in the elastically deformable portion 7b of the leaf spring 7 on the movable f5 side becomes larger than the stress generated in the elastically deformable portion 6b of the leaf spring 6 on the frame 2 side. Of both leaf springs 6 and 7,
There is a problem in that the elastically deformed portion 7b of the leaf spring 7 on the movable element 5 side is highly fatigued, and the leaf spring 7 is buckled or broken at the elastically deformed portion 7b.
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 convert the motion of a piezoelectric element by preventing buckling or breakage occurring in the elastic deformation portion 7b of the plate spring 7 on the movable element 5 side and improving durability. The purpose is to provide equipment.
（課題を解決覆るための手段）
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−・側
に沿って延６．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ｂ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しのである
９゜
（作 用）
前記したように構成される圧電索子の運動変換装置にｄ
３いて、圧電素ｆの伸縮に基づいて変位される可動イの
変位力を受【プて同可動子側の板ばねが、メインフレー
ム側の板ぼ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１゜
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＋！１変形部の弾性
強度を高めであるから、その弾性強度を高めた分だけ、
同ｂＩ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１３（実施例）
以上、この発明の一実施例を第１図〜第５図に従って説
明づる。(Means for solving and overcoming the problems) In order to achieve the above object, the present invention includes a base that supports one end of the piezoelectric element in the expansion and contraction direction, and extends along the - side of the piezoelectric element. One end portion of a pair of leaf springs is fixed to a main frame that moves and a movable element disposed at the other end of the piezoelectric element in the expansion and contraction direction, and each elastic deformation of both the leaf springs is caused by the expansion and contraction of the piezoelectric element. The motion converting device is configured to tilt a tilting body connected to the other ends of both leaf springs by bending the movable member, the movable member The elastic strength of the elastically deformed portion of the side leaf spring is increased.
3. When the leaf spring on the movable element side is pushed up along the leaf spring on the main frame side by receiving the displacement force of the movable element A which is displaced based on the expansion and contraction of the piezoelectric element The spring elastically deforms into a curved shape at each elastic deformation portion and bends, and the leaf spring on the mover side bends greatly toward the leaf spring on the main frame side, so that it is connected to the other end of both leaf springs. A rotational moment is generated in the part of the tilting body, which causes
In particular, when the tilting body is tilted 1°, the elastic strength of the leaf spring on the mover side is greater than the elastic strength of the elastic deformation portion of the leaf spring on the main frame side! 1.Since the elastic strength of the deformed part is high, the elastic strength is increased by the amount that the elastic strength is increased.
13 (Embodiment) The degree of fatigue of the elastically deformed portion of the leaf spring on the movable element side can be suppressed to a small level 13 (Embodiment) An embodiment of the present invention will be described above with reference to FIGS. 1 to 5.
この実施例では印字ヘッドに採用しＩＣものを例示する
ものて゛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Ｎ索子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, an IC is used as an example of the print head, and in FIGS. 2 and 3, the pressure N rope 1 that expands and contracts when a voltage is applied is made of laminated piezoelectric ceramic. ing.
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ｆ１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料１２及び予圧部材１３を
介して支持Ｊ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 f1 is made of a metal plate having a predetermined thickness and having a rectangular shape extending substantially parallel to the direction of expansion and contraction of the piezoelectric element f1. A base 3 is provided at one end of the main frame 2 to protrude in the lateral direction for supporting one end (lower end) of the piezoelectric element 1 in the expansion/contraction direction via a temperature compensation member 12 and a preload member 13, which will be described later. Further, on both side surfaces of the main frame 2, guide grooves 2a for guiding the lead wires 14 of the piezoelectric element 1 and recesses 2b for weight reduction are formed.
萌記圧電素Ｆ１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」一端部と対向した状態におい
て、可動、ｆ５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、−・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。A movable element f5 is disposed at the other end (upper end) of the piezoelectric element F1 in the expansion/contraction direction, facing one end of the rising portion of the main frame 2. A pair of leaf springs 6 and 7 are fixed to the opposing surfaces of the movable element 5 and the main frame 2 at one end thereof by brazing.
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’ｆ５の板厚」、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Ｉｃ状態でろう付け
されることで、メインル−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。ざらに、前
記両板ばね６，７（よ、所定の隙間を隔てて対向で−る
とともに、メインフレーム２及び可動Ｆ５の上端面より
圧電索子１の伸縮方向に所定長さだけ延出されている。The plate width of both leaf springs 6 and 7 is the same as that of the main frame 2 and the movable plate f5. By protruding from the plate thickness surface of the element 5 and being brazed in the Ic state, the fixing force of each leaf spring 6, 7 to the main room 2 and the movable element 5 is increased. Roughly speaking, both the leaf springs 6 and 7 are opposed to each other with a predetermined gap in between, and extend a predetermined length from the upper end surfaces of the main frame 2 and the movable F5 in the direction of expansion and contraction of the piezoelectric cable 1. ing.
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−・体に結合された状態で形成
されでいる。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、７
ａ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。A tilting body 8 is formed at the other end (extending end) of both the leaf springs 6, 7 and is connected to the body of both the leaf springs 6, 7. Further, on the opposite side of the opposing surfaces of the leaf springs 6 and 7, recesses 6a and 7 are provided in a range extending from the upper end surfaces of the main frame 2 and the movable element 5 to the lower end of the tilting body 8.
a are formed, and the thinned portions are elastically deformable portions 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６０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。7b. Furthermore, the plate thickness t2 of the elastically deformable portion 7b of the plate spring 7 fixed to the movable element 5 side is the same as that of the main frame 2.
The plate spring 60 is set to be thicker than the plate thickness t1 of the elastically deformable portion 6b of the leaf spring 60 fixed to the main frame 2 side. The elastic strength of the elastic deformation portion 7a of the side leaf spring 7 is increased.
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８８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ｒ１
１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、萌記傾動体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には軽量化のだめの大小の貫通孔９が適宜に
貫設されている。The tilting body 8 has an arm mounting groove 8a recessed in parallel to the arrangement direction of the leaf springs 6 and 7, and the tilting arm 10 is inserted into the arm mounting groove 88 at its base. It is fixed by attaching it. A cutout-shaped wire attachment groove 10a is formed at the tip of the tilting arm 10, and a printing wire r1 is formed in this wire attachment groove 10a.
The proximal end of 1 is inserted and secured by brazing. In addition, as shown in FIG. 2, the Moeki tilting body 8 has the portions corresponding to both sides of the leaf springs 6 and 7 in the width direction cut out in the shape of a notch, thereby reducing the weight. Further, the tilting arm 10 is provided with through holes 9 of appropriate sizes 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・端部において一体に形成されている。A subframe 4 is integrally formed with the base 3 of the main frame 2 at its end.
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。The subframe 4 extends along the other side of the piezoelectric element 1 (the side opposite to the main frame 2) to a position facing the movable element 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、その伸縮り向と平行に可動
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図に示ず
ように、−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ど、これら両リンクプレート１７を−
・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。Between the extending end of the subframe 4 and the movable element 5, there is a four-bar parallel link mechanism 16 for guiding the movable element 5 in parallel with the direction of expansion and contraction of the piezoelectric element 1 based on the expansion and contraction of the piezoelectric element 1. It is arranged. As shown in FIG. 5, this parallel link mechanism 16 includes a pair of link plates 17 formed by punching and bending two pieces of elastically deformable leaf spring material. Link plate 17-
- It is mainly composed of the connecting portion 26 that is connected to the body.
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、これら両級リンク部
１８．１９の間に弾性変形可能なヒンジ部２２．２３，
２４．２５を６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の下端部に所定隙間を隔てて配置され
る。The pair of link plates 17 includes a vertical link portion 18.19 parallel to the direction of expansion and contraction of the piezoelectric element 1, and a hinge portion 22.23 that can be elastically deformed between these link portions 18.19.
24, 25 and 6 horizontal link parts 20 and 21, respectively, to form a four-section parallel link. The vertical link portions 18 of each one of the link plates 17 are fixed to both side surfaces of the subframe 4 by spot welding or the like, and the other vertical link portions 19 are fixed to both side surfaces of the movable element 5 by spot welding or the like. is fixed by. Furthermore, each vertical link part 19 fixed to both sides of the movable element 5
A coupling portion 26 is integrally formed across the tip of the movable member 5, and this coupling portion 26 is arranged at the lower end of the movable element 5 with a predetermined gap therebetween.
また、この実施例において、前記各一方の縦リンク部１
８のＦ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。ざらに、
各連結プレート３゜の両端部はメインフレーム２とザブ
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 one of the vertical link portions 1
8, a connecting plate 30 is integrally formed at one end thereof. Each of the connection plates 30 extends to a side surface of the main frame 2. Roughly,
Both ends of each connecting plate 3° 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 subframe 4 is kept parallel to the main frame 2, and the rigidity of each frame 2, 4 is increased.
また、この実施例において、前記リンクプレト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−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, in the portion where the link plate 17 and the connecting plate 30 are arranged, the main frame 2. The plate thicknesses of the subframe 4 and mover 5 are reduced, so that the link plate 17 and the connection plate 30 can be assembled within the plate thickness of the main frame 2 and subframe 4, and the device can be miniaturized. There is. Further, in the portions where the hinge portions 22 to 25 and the horizontal link portions 20.21 of the link plate 17 are arranged, the hinge portions and the horizontal link portions are prevented from coming into contact with the side surfaces of the subframe 4. A thin wall portion 4a is formed at the extending end of the subframe 4. As shown in FIG.
前記サブフレーム４と可動子５ど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（づられた後、メ
インフレーム２の基部３と可動子５との間に、圧電素Ｆ
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Ｂ−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Ｊ字状に形成さ
れ、前記基部３の上面に跨って上Ｆ動自在に嵌込まれる
。After the link plate 17 and the connecting plate 30 are assembled between the subframe 4 and the movable element 5, a piezoelectric element F is installed between the base 3 of the main frame 2 and the movable element 5.
1 and the temperature compensating material 12 are assembled while being preloaded by a predetermined pressure by the preload member 13. The preload member 13 is formed in an inverted J shape with an upper plate 13a and both side plates 13b, and is fitted so as to straddle the upper surface of the base 3 so as to be movable upward.
方、圧電素子１の伸縮方向一端（小端）面には、予め温
度補償材１２が接着剤によって固着される。On the other hand, a temperature compensating material 12 is fixed in advance to one end (small end) of the piezoelectric element 1 in the expansion/contraction direction using an adhesive.
そして温度補償材１２の下面を前記予圧部材１３の上板
１３ａ上面に当接させるどどちに、予圧部材１３を押上
げながら圧電素子１の他端面を可動′ｆ−５の下面に所
定荷重で１１接させた状態のらとで、前記予Ｆト部材１
３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
。Then, while the lower surface of the temperature compensator 12 is brought into contact with the upper surface of the upper plate 13a of the preload member 13, the other end surface of the piezoelectric element 1 is applied to the lower surface of the movable 'f-5 with a predetermined load while pushing up the preload member 13. 11, with the edges in contact with each other, the pre-F tom member 1
The piezoelectric element 1 is assembled by fixing the side plates 13b of No. 3 to both side surfaces of the base portion 3 by spot welding.
また、前記湿度補償料１２は、圧電素子１０負の温度線
膨張率特性とは逆の正の温度線膨張率特性を有する材料
、例えば亜＠１月やアルミ材によって構成されている。Further, the humidity compensation material 12 is made of a material having a positive temperature linear expansion coefficient characteristic opposite to the negative temperature linear expansion coefficient characteristic of the piezoelectric element 10, such as a submerged aluminum material or an aluminum material.
そして、周囲の温度変化による圧電素子１の伸縮を、温
度補償料１２の上下方向の伸びによって修正し、圧電素
ｒ１の上面高さを常に一定に保つようになっている。Expansion and contraction of the piezoelectric element 1 due to changes in ambient temperature is corrected by vertical expansion of the temperature compensation material 12, so that the height of the top surface of the piezoelectric element r1 is always kept constant.
なお、可動子５下面ど圧電素子１の伸縮方向他端面どの
相互の接触面、並びに、湿度補償材１２下面と予圧部材
１３の上板１３ａ、ｈ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。Note that the mutual contact surfaces such as the lower surface of the mover 5 and the other end surface in the expansion and contraction direction of the piezoelectric element 1, as well as the mutual contact surfaces between the lower surface of the humidity compensation material 12 and the upper plates 13a and h surfaces of the preload member 13, may be adjusted as necessary. Glued by adhesive.
また、この実施例において、可動ｆ５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どしてい
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Ｆ１に対し電圧の印加が断た
れて圧電素子１が収縮するどきには、可動子５の弾性伸
縮部５ｂが微量に伸びることで、圧電索Ｆ１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索子
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。Furthermore, in this embodiment, cutout-like recesses 5a are formed at both edges in the width direction of the lower portion of the movable f5, and the narrowed width portions thereby serve as elastic stretchable portions 5b. Further, the elastic stretchable portion 5b of the movable element 5 is formed by a plate spring 7.
It is formed to have higher rigidity than the elastically deformable portion 7b and to be able to expand and contract slightly elastically in the direction of expansion and contraction of the piezoelectric element 1. A predetermined amount of displacement of the movable element 5 based on the expansion and contraction of the piezoelectric element 1 is ensured, and when the voltage is cut off to the piezoelectric element F1 and the piezoelectric element 1 contracts, the elastic expansion and contraction of the movable element 5 occurs. By slightly elongating the portion 5b, the tensile force acting on the piezoelectric cable F1 is reduced. Even when the piezoelectric cord 1 is made of a piezoelectric ceramic having a property of being fragile against tensile force, damage to the piezoelectric element 1 is prevented.
上述したように構成されるこの実施例において、圧電索
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ｄ３いて矢印×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。するど、可動子５の変位力を受けて可動子５側の
板はね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、７
ｂ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側の板ぼね６に向け
て大きく撓むことで、第３図において矢印１〕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 by a predetermined length in the stacking direction, that is, in the arrow x direction at d3 in FIG. 3, and the movable element 5 is displaced based on this. Then, in response to the displacement force of the mover 5, the plate spring 7 on the mover 5 side is pushed up along the plate spring 6 on the main frame 2 side, and both the plate springs 6, 7 deform at their respective elastic deformation parts. 6b, 7
In particular, the elastic deformation portion 7b of the plate spring 7 on the movable element 5 side, which bends in a curved shape at point b, bends greatly toward the plate spring 6 on the main frame 2 side, so that it bends in the direction of arrow 1 in FIG. A rotational moment is generated, which causes the tilting body 8 to tilt.
さて、萌記町動ｆ５側に固着された板はね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１．１、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ｌ−２側
の板はね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７
ｂ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ざく押えることができ
、可動子５側の板はね７の弾性変形部７ｂにおりる座屈
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 deformable portion 7b of the leaf spring 7 fixed to the Moekimachi motion f5 side is 1.1, the plate thickness of the elastically deformable portion 6b of the leaf spring 6 fixed to the main frame 2 side, The elastic strength of the movable member 5 is set to be thicker than that of the elastic deformation portion 6a of the plate spring 6 on the main frame l-2 side.
The elastic strength of the elastic deformation portion 7a of the side leaf spring 7 is increased. For this reason, the elastic deformation portion 7 of the leaf spring 7 on the movable element 5 side
By increasing the elastic strength of b, the degree of fatigue due to repeated elastic deformation of the elastic deformation portion 7b can be suppressed to a small extent, and the buckling that occurs in the elastic deformation portion 7b of the plate spring 7 on the movable element 5 side can be suppressed. It is possible to proactively prevent damage and breakage.
また、この実施例にｄ３いて、前記圧電素子１の伸びに
基づい′ＣＩＴＪ動ｆ−５が変位されるどきには、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ｆ１の伸縮方向と平行に
案内される。このため、可動子５の傾きが原因どなる両
板ばね６，７の撓み喝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
まで確実に萌進される。Further, in this embodiment, when the CITJ movable f-5 is displaced based on the elongation of the piezoelectric element 1 in d3, the movable member is moved by each link plate 17 constituting the four-bar parallel link mechanism 16. 5 is guided in parallel to the direction of expansion and contraction of the piezoelectric element f1. Therefore, insufficient deflection of both leaf springs 6 and 7 due to the inclination of the movable element 5 is prevented, so that the tilting body 8 can be tilted to a predetermined tilt angle position. Then, with the printing wire 11 at the tip of the tilting body 8 being guided by a predetermined number of guide members 15, the tip is surely advanced to the printing position.
なお、前述した実施例においては、メインフレｌ＼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
側の板はね７０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。In the above-mentioned embodiment, the movable member 5
Although the plate thickness t2 of the elastically deformable portion 7b of the side plate 70 is set to be thick to increase the elastic strength of the elastically deformable portion 7b, the present invention is not limited to this.
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側の板はね７の弾性変形部７ｂ
の板幅を幅広にして、メインフレム２側の板ばね６の弾
性変形部６ｂの弾性強度よりも可動ｆ５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
性強度にりも可動子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。For example, the plate thicknesses of the elastically deformable parts 6b and 7b of both leaf springs 6 and 7 are the same, and the elastically deformable part 7b of the leaf spring 7 on the movable element 5 side
The elastic strength of the elastic deformation portion 7b of the leaf spring 7 on the movable f5 side can be made higher than the elastic strength of the elastic deformation portion 6b of the leaf spring 6 on the main frame 2 side by widening the plate width. Further, the elastic deformation parts 6b and 7b of both leaf springs 6.7 are made to have the same thickness and width, and the leaf spring 7 on the movable element 5 side is made of a spring material with higher rigidity than the leaf spring 6 on the main frame 2 side. With this configuration, it is possible to increase the elastic strength of the elastically deformable portion 7b of the leaf spring 7 on the movable element 5 side 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Ｔ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なした圧電
素Ｐ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６可動子側の板ば
ねの弾性変形部の弾性強度を高めであるから、その弾性
強度を高めた分だけ、可動子側の板ぼねの弾性変形部の
疲労度を小さく抑えることができる。(Effects of the Invention) As described above, according to the present invention, the movable T is displaced based on the expansion and contraction of the piezoelectric element, and the pair of leaf springs whose ends are fixed to each other between the main frame and the movable element are In a motion converting device for a piezoelectric element P, which tilts a tilting body connected to the other end portions of both leaf springs by bending its elastically deformed portion, in particular, the movement of the leaf spring on the main frame side is Since the elastic strength of the elastic deformation part of the leaf spring on the 6-mover side is higher than the elastic strength of the elastic deformation part, the degree of fatigue of the elastic deformation part of the leaf spring on the movable element side increases by the amount that the elastic strength is increased. can be kept small.
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。As a result, it is possible to actively prevent buckling and breakage in the elastically deformed portion of the plate spring on the movable element side, thereby improving 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線断面図、第５図は四節の平
行リンクＩＩＭＡを示す斜視図である。第６図は先行技
術のものを示づ側面図である。
１・・・圧電素子
２・・・メインフレー・ム
５・・・可 動 子
６７・・・板 ば ね
６ｂ、 ７ｂ・・・弾性変形部
８・・・（頃 動 体1 to 5 of the drawings show an embodiment of the present invention. Figure 2 is a perspective view showing the entire motion conversion device, Figure 3 is a side view, Figure 4 is a sectional view taken along the line IV in Figure 3, and Figure 5 is a perspective view showing the four-section parallel link IIMA. be. FIG. 6 is a side view of the prior art. 1... Piezoelectric element 2... Main frame 5... Movable element 67... Leaf springs 6b, 7b... Elastic deformation part 8... (Moving body
Claims (1)
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つて、 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。[Scope of Claims] A main frame that includes a base that supports one end of the piezoelectric element in the expansion and contraction direction and extends along one side of the piezoelectric element, and a movable element that is disposed at the other end of the piezoelectric element in the expansion and contraction direction. one end of each of the pair of leaf springs is fixed, and a tilting body connected to the other ends of the two leaf springs is tilted by bending of each elastic deformation portion of the leaf springs based on the expansion and contraction of the piezoelectric element. The piezoelectric motion conversion device is characterized in that the elastic strength of the elastic deformation portion of the leaf spring on the movable element side is higher than the elastic strength of the elastic deformation portion of the leaf spring on the main frame side. Element motion conversion device.
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 true JPH0236951A (en) | 1990-02-06 |
| JPH0681718B2 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) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5289074A (en) * | 1991-10-09 | 1994-02-22 | Fujitsu Limited | Piezo-electric device type actuator |
| JP2003038046A (en) * | 2001-07-27 | 2003-02-12 | Mikado Kako Kk | Mulch film for agriculture |
-
1988
- 1988-07-27 JP JP63187165A patent/JPH0681718B2/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5289074A (en) * | 1991-10-09 | 1994-02-22 | Fujitsu Limited | Piezo-electric device type actuator |
| JP2003038046A (en) * | 2001-07-27 | 2003-02-12 | Mikado Kako Kk | Mulch film for agriculture |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0681718B2 (en) | 1994-10-19 |
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