JPH01177881A - Vibrator for ultrasonic motor - Google Patents
Vibrator for ultrasonic motorInfo
- Publication number
- JPH01177881A JPH01177881A JP63002326A JP232688A JPH01177881A JP H01177881 A JPH01177881 A JP H01177881A JP 63002326 A JP63002326 A JP 63002326A JP 232688 A JP232688 A JP 232688A JP H01177881 A JPH01177881 A JP H01177881A
- Authority
- JP
- Japan
- Prior art keywords
- vibrator
- paper
- diaphragm
- ultrasonic motor
- mode
- 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
- 238000005452 bending Methods 0.000 claims description 4
- 125000003700 epoxy group Chemical group 0.000 abstract 1
- 239000011347 resin Substances 0.000 abstract 1
- 229920005989 resin Polymers 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 229910001220 stainless steel Inorganic materials 0.000 description 2
- 239000010935 stainless steel Substances 0.000 description 2
- 238000009429 electrical wiring Methods 0.000 description 1
- 239000003822 epoxy resin Substances 0.000 description 1
- 229920000647 polyepoxide Polymers 0.000 description 1
Landscapes
- General Electrical Machinery Utilizing Piezoelectricity, Electrostriction Or Magnetostriction (AREA)
Abstract
Description
【発明の詳細な説明】
（産業上の利用分野）
本発明は、超音波振動エネルギーを利用した紙送り超音
波モータ用振動子に関する。DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a vibrator for a paper feed ultrasonic motor that utilizes ultrasonic vibration energy.
（従来の技術）
従来、紙送り超音波モータは、第５図に示すように、金
属等の振動板２の平面全体あるいは一部分に圧電体１を
接着し、高周波電圧３を単相で印加して振動させ、紙送
りしていた。しかしながら、上記した従来の振動子は紙
を駆動する力が弱く、そのため紙送りを必要とする装置
の内、紙に加わる負荷が小さい装置にしか使用できない
状態であった。(Prior Art) Conventionally, as shown in FIG. 5, a paper feeding ultrasonic motor has a piezoelectric material 1 adhered to the entire plane or a part of the plane of a diaphragm 2 made of metal, etc., and a high frequency voltage 3 is applied in a single phase. The paper was fed by vibrating the machine. However, the above-mentioned conventional vibrator has a weak force for driving paper, and therefore can only be used in devices that require paper feeding and that place a small load on the paper.
（発明が解決しようとする問題点）
従来の振動子のように金属等の振動板の平面全体あるい
は一部分に圧電体を接着し、高周波電圧を単相で印加し
て振動させた場合は、振動子の長手一次縦振動モード（
以下、Ｌ１モードと言う）あるいは振動子の長手方向に
平行な方向に二つの振動の節及び垂直な方向に二つの振
動の節を有する二次元屈曲振動モード（以下、Ｂ２−２
モードと言う）の片方のモードが優先して振動するため
、Ｌ１モードとＢ２゜２モードを効率良く振動させるこ
とが不可能である。本発明は、Ｌ１モードとＢ２．２モ
ードを効率良く振動させることで、従来の超音波モータ
に比べて、駆動力の優れた紙送り超音波モータ用振動子
を提供することにある。(Problem to be solved by the invention) When a piezoelectric material is bonded to the entire flat surface or a part of a metal diaphragm, as in the case of a conventional vibrator, and a high-frequency voltage is applied in a single phase to vibrate, the vibration Child's longitudinal primary longitudinal vibration mode (
(hereinafter referred to as L1 mode) or a two-dimensional bending vibration mode (hereinafter referred to as B2-2 mode) having two vibration nodes in a direction parallel to the longitudinal direction of the vibrator and two vibration nodes in a perpendicular direction.
Since one of the two modes vibrates with priority, it is impossible to vibrate the L1 mode and the B2°2 mode efficiently. An object of the present invention is to provide a vibrator for a paper feed ultrasonic motor that has superior driving force compared to conventional ultrasonic motors by efficiently vibrating the L1 mode and B2.2 mode.
（問題点を解決するための手段）
本発明は、従来の紙送り超音波モータ用振動子の問題点
を解決して、高駆動力の超音波モータを得るための手段
として、第１図に示すように、矩形状平板振動板の平面
全体に平板状圧電素子を接着接合して、振動子のＬ０モ
ードとＢＺ−２モードを振動させて紙送りする超音波モ
ータ用振動子に於て、振動子の長手方向の中心から左右
対称に該振動子の長さの４０％以上から９０％以下に渡
って接着されている圧電素子に主に長手一次縦振動モー
ドを振動させるために高周波電圧を印加し、それ以外の
圧電素子に主に二次元屈曲振動モードを振動させるため
に高周波電圧を印加することを特徴とする。(Means for Solving the Problems) The present invention is a means for solving the problems of conventional paper-feeding ultrasonic motor vibrators and obtaining an ultrasonic motor with high driving force, as shown in FIG. As shown, in a vibrator for an ultrasonic motor that feeds paper by vibrating the L0 mode and BZ-2 mode of the vibrator, a flat piezoelectric element is adhesively bonded to the entire plane of a rectangular flat plate diaphragm. A high frequency voltage is applied to the piezoelectric element bonded symmetrically from the longitudinal center of the vibrator over 40% or more and 90% or less of the length of the vibrator to vibrate mainly in the longitudinal primary longitudinal vibration mode. It is characterized by applying a high-frequency voltage to the other piezoelectric elements in order to vibrate mainly in a two-dimensional bending vibration mode.
次に限定理由について説明する。振動子の長手方向の中
心から左右対称に該振動子の長さ１゜に対する圧電素子
の長さ１□の比率が４０％を下回ると、Ｌ１モードの振
動振幅が小さくなり、本発明の振動子は得られない。前
記比率が９０％を越えるとＬ１モードの振動振幅は大き
いが、振動子の両端に残った圧電素子に高周波電圧を印
加してもＢ２．２モードの振動振幅が小さいため、本発
明の振動子は得られない。Next, the reason for the limitation will be explained. When the ratio of the length 1□ of the piezoelectric element to the length 1° of the vibrator symmetrically from the longitudinal center of the vibrator is less than 40%, the vibration amplitude of the L1 mode becomes small, and the vibrator of the present invention cannot be obtained. When the ratio exceeds 90%, the vibration amplitude of the L1 mode is large, but the vibration amplitude of the B2.2 mode is small even if a high frequency voltage is applied to the piezoelectric elements remaining at both ends of the vibrator. cannot be obtained.
従って、１□１１ｏの比率を４０％以上から９０％以下
と限定した。Therefore, the ratio of 1□11o was limited to 40% or more and 90% or less.
（作用）
上記のような本発明の振動子は、第４図に示すような紙
送り機構に配置される。ローラ４により紙５を振動子に
圧接すれば紙は移動し、圧接しなければ紙は移動しない
。従って、Ｌ１モードの振動は、方向はともかく、紙を
移動させるために必要であり、Ｌエモードの振動振幅が
大きい方が望ましい。(Function) The vibrator of the present invention as described above is placed in a paper feeding mechanism as shown in FIG. If the paper 5 is pressed against the vibrator by the roller 4, the paper will move, and if it is not pressed, the paper will not move. Therefore, regardless of the direction, the L1 mode vibration is necessary to move the paper, and it is desirable that the L1 mode vibration amplitude be large.
一方、ＢＺ−２モードの振動は紙を振動子に圧接したり
、圧接しなかったりするために必要であり、Ｂ。On the other hand, the BZ-2 mode vibration is necessary to press the paper against the vibrator or not to press it.
２モードの振動振幅も大きい方が望ましい。従って、本
発明のＬ１モード及びＢ２−２モードの振動を独立して
効率良く振動させるように圧電素子を振動板に接着した
構成の振動子は、従来の振動子と比較して優れた性能を
有する。実際、紙を移動させる推力は、本発明の振動子
の方が従来の振動子より大きい。また、紙送り速度も良
好であり、二相駆動に位相を与えれば、紙の左右両方行
送りもできる。It is also desirable that the vibration amplitudes of the two modes be large. Therefore, the vibrator of the present invention, which has a piezoelectric element bonded to a diaphragm so as to independently and efficiently vibrate the L1 mode and B2-2 mode, has superior performance compared to conventional vibrators. have In fact, the thrust force for moving the paper is greater in the vibrator of the present invention than in the conventional vibrator. In addition, the paper feeding speed is good, and by adding a phase to the two-phase drive, it is possible to feed both left and right lines of paper.
（実施例）
以下、本発明の実施例について図面を参照しながら説明
する。(Example) Examples of the present invention will be described below with reference to the drawings.
第１図は本発明の振動子の一例であり、３つの圧電素子
１が振動板２にエポキシ系樹脂を使用して接着されてい
る。同図（ａ）は平面図で、１ｏは振動板の長さ、１□
は中央の圧電素子の長さを示す。同図（ｂ）は側面図で
、振動板を共通にして圧電素子と高周波電源との接続を
示している。第１図（ａ）に於て、１□１１ｏが０．４
．０．６．０．８．０．９となるように圧電素子を５Ｕ
Ｓ３０４ステンレス鋼からなる振動板に接着して振動子
を作製した。また、１．１１ｏが０．３．１となるよう
に圧電素子を５ＵＳ３０４ステンレス鋼からなる振動板
に接着して振動子を作製した。これらの振動子は第１図
（ｂ）のように電気接続され、第４図のような紙送り機
構に配置されて評価された。その結果、推力について比
べると、１□１１ｏが０．４以上から０．９以下の振動
子は、１□／１ｏが０．３の振動子より２〜４倍大きい
。また、１１／１．が０．４以上から０．９以下の振動
子は、１１／１．が１の振動子より１．５倍大きい。更
に、第１図（ｂ）の高周波電源３〜２を使用した場合と
使用しない場合では、使用した方が３倍程度推力が大き
い。FIG. 1 shows an example of a vibrator according to the present invention, in which three piezoelectric elements 1 are bonded to a vibrating plate 2 using epoxy resin. Figure (a) is a plan view, where 1o is the length of the diaphragm, and 1□
indicates the length of the central piezoelectric element. FIG. 2B is a side view showing the connection between the piezoelectric element and the high frequency power source using a common diaphragm. In Figure 1(a), 1□11o is 0.4
．． 5U of piezoelectric element so that it is 0.6.0.8.0.9
A vibrator was manufactured by bonding it to a diaphragm made of S304 stainless steel. Further, a vibrator was manufactured by bonding a piezoelectric element to a diaphragm made of 5US304 stainless steel so that 1.11o was 0.3.1. These vibrators were electrically connected as shown in FIG. 1(b), placed in a paper feeding mechanism as shown in FIG. 4, and evaluated. As a result, when comparing the thrust force, a vibrator with 1□11o of 0.4 or more and 0.9 or less is 2 to 4 times larger than a vibrator with 1□/1o of 0.3. Also, 11/1. A vibrator with a value of 0.4 or more and 0.9 or less is 11/1. is 1.5 times larger than the oscillator 1. Furthermore, the thrust is about three times larger when the high frequency power sources 3 to 2 shown in FIG. 1(b) are used and when they are not used.
本発明の振動子は、上記した本発明以外の振動子と比べ
て紙送り速度の点でも優れている。また、第１図（ｂ）
に示す二相駆動により振動子を振動させると、位相を適
当に選定することによって、振動子の性能を最適に調整
することができる。更に、位相の切り換えで紙送り方向
を反転することもできる。The vibrator of the present invention is also superior in terms of paper feeding speed compared to the above-mentioned vibrators other than the present invention. Also, Fig. 1(b)
When the vibrator is vibrated using the two-phase drive shown in FIG. 1, the performance of the vibrator can be optimally adjusted by appropriately selecting the phase. Furthermore, the paper feeding direction can also be reversed by switching the phase.
第２図及び第３図は本発明の他の例である。即ち、電気
配線あるいは振動子の土台への固定のため、圧電素子は
必ずしも振動板の平面全体に接着する必要はない。また
、本発明は振動板の厚さ、幅に関係なく成立するもので
ある。FIGS. 2 and 3 are other examples of the present invention. That is, the piezoelectric element does not necessarily need to be bonded to the entire plane of the diaphragm in order to fix the electrical wiring or the vibrator to the base. Furthermore, the present invention is applicable regardless of the thickness and width of the diaphragm.
（発明の効果）
本発明の紙送り超音波モータ用振動子を使用すれば、推
力及び速度とも優れ、また紙を左右両方性に送ることが
できる紙送り機構が実現でき、ファクシミリ、及びプリ
ンターあるいは他の幅広いＯＡ機器に利用することがで
きる。(Effects of the Invention) By using the vibrator for a paper feed ultrasonic motor of the present invention, it is possible to realize a paper feed mechanism that has excellent thrust and speed and is capable of feeding paper both left and right. It can be used for a wide range of other OA equipment.
第１図は本発明の紙送り超音波モータ用振動子を示す図
、（ａ）は平面図、（ｂ）は側面図である。第２図及び
第３図は本発明の他の例、第４図本発明の振動子を評価
するための紙送り機構の構成図、第５図は従来の振動子
を示す。図中で、１は圧電素子、２は振動板、３は高周
波電源、４はローラ、５は紙を示す。FIG. 1 is a diagram showing a vibrator for a paper feeding ultrasonic motor according to the present invention, (a) is a plan view, and (b) is a side view. FIGS. 2 and 3 show other examples of the present invention, FIG. 4 is a block diagram of a paper feeding mechanism for evaluating the vibrator of the present invention, and FIG. 5 shows a conventional vibrator. In the figure, 1 is a piezoelectric element, 2 is a diaphragm, 3 is a high frequency power source, 4 is a roller, and 5 is paper.
Claims (1)
接合して、振動子の長手一次縦振動モードと振動子の長
手方向に平行な方向に二つの振動の節及び垂直な方向に
二つの振動の節を有する二次元屈曲振動モードを振動さ
せる超音波モータ用振動子に於て、振動子の長手方向の
中心から左右対称に該振動子の長さの４０％以上から９
０％以下に渡つて、主に長手一次縦振動モードを振動さ
せるための圧電素子を振動板に接着され、それ以外の圧
電素子は主に二次元屈曲振動モードを振動させために振
動板に接着されていることを特徴とする超音波モータ用
振動子。A flat piezoelectric element is adhesively bonded to the entire plane of a rectangular flat plate diaphragm, and the longitudinal primary longitudinal vibration mode of the vibrator has two vibration nodes in a direction parallel to the longitudinal direction of the vibrator and two vibration nodes in a perpendicular direction. In an ultrasonic motor vibrator that vibrates in a two-dimensional bending vibration mode having vibration nodes, 90% or more of the length of the vibrator is symmetrically spaced from the longitudinal center of the vibrator.
0% or less, a piezoelectric element is bonded to the diaphragm to mainly vibrate the first longitudinal vibration mode, and other piezoelectric elements are bonded to the diaphragm to vibrate mainly the two-dimensional bending vibration mode. A vibrator for an ultrasonic motor, characterized by:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63002326A JPH0669302B2 (en) | 1988-01-07 | 1988-01-07 | Ultrasonic motor oscillator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63002326A JPH0669302B2 (en) | 1988-01-07 | 1988-01-07 | Ultrasonic motor oscillator |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH01177881A true JPH01177881A (en) | 1989-07-14 |
| JPH0669302B2 JPH0669302B2 (en) | 1994-08-31 |
Family
ID=11526190
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63002326A Expired - Lifetime JPH0669302B2 (en) | 1988-01-07 | 1988-01-07 | Ultrasonic motor oscillator |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0669302B2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5233258A (en) * | 1991-03-28 | 1993-08-03 | Nec Corporation | Ultrasonic sheet feeder, low-profile ultrasonic motor, and method of driving the same |
| JP2016163426A (en) * | 2015-03-02 | 2016-09-05 | キヤノン株式会社 | Vibration type actuator and ultrasonic motor |
-
1988
- 1988-01-07 JP JP63002326A patent/JPH0669302B2/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5233258A (en) * | 1991-03-28 | 1993-08-03 | Nec Corporation | Ultrasonic sheet feeder, low-profile ultrasonic motor, and method of driving the same |
| JP2016163426A (en) * | 2015-03-02 | 2016-09-05 | キヤノン株式会社 | Vibration type actuator and ultrasonic motor |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0669302B2 (en) | 1994-08-31 |
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