JP2020102971A - Vibration wave motor - Google Patents

Vibration wave motor Download PDF

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JP2020102971A
JP2020102971A JP2018240487A JP2018240487A JP2020102971A JP 2020102971 A JP2020102971 A JP 2020102971A JP 2018240487 A JP2018240487 A JP 2018240487A JP 2018240487 A JP2018240487 A JP 2018240487A JP 2020102971 A JP2020102971 A JP 2020102971A
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vibrator
oscillator
vibration wave
wave motor
guide portion
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真介 吉田
Shinsuke Yoshida
真介 吉田
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Canon Inc
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Canon Inc
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Abstract

To provide a small vibration wave motor.SOLUTION: There is provided a vibration wave motor in which an oscillator and a friction member move relative to each other by ultrasonic vibration generated in the oscillator, comprising an oscillator consisting of a piezoelectric element and a vibrating body, a wiring board 115 connected to the piezoelectric element, a frictional member in frictional contact with the oscillator, an oscillator holding member 106 that holds the oscillator, and a base member 110 that holds the oscillator holding member and the friction member. The oscillator holding member is equipped with a first guide section 107 that guides the movement of the wiring board associated with the relative movement of the oscillator and the friction member. The base member is disposed in a position facing the first guide section and has a second guide section 111 that guides the movement of the wiring board as the oscillator and friction member move relative to each other. The distance between the first and second guide sections widens in the direction of relative movement of the oscillator and the friction member as it moves away from the center 130 of the oscillator.SELECTED DRAWING: Figure 3

Description

本発明は、駆動装置に関し、特に振動波モータに関する。 The present invention relates to a drive device, and more particularly to a vibration wave motor.

従来から、高トルク出力、高い位置決め精度、静粛性などの特徴を活かして、例えばカメラやレンズの駆動源として、振動波モータが広く採用されている。 Conventionally, a vibration wave motor has been widely used, for example, as a driving source of a camera or a lens, taking advantage of features such as high torque output, high positioning accuracy, and quietness.

近年では、多群のズーム構成においても、比較的簡単な構造で小型に構成することが望まれており、振動波モータのユニットも同様に更なる小型化が求められている。 In recent years, even in a multi-group zoom configuration, it has been desired to be small in size with a relatively simple structure, and the vibration wave motor unit is also required to be further downsized.

特許文献1には、振動板と圧電素子からなる振動子と、振動子保持部材とを固定し、振動子の振動を阻害しないように動力を取りだす技術が開示されている。 Patent Document 1 discloses a technique in which a vibrator including a vibration plate and a piezoelectric element and a vibrator holding member are fixed and power is taken out so as not to hinder the vibration of the vibrator.

特開2015−126692号公報JP, 2005-126692, A

しかしながら、上記の特許文献1においては、圧電素子に接続される配線基板を振動子の移動方向に対して側面から配回し、配線基板の移動を振動子支持部材がガイドする必要が有る。その際、振動子支持部材が配線基板の曲げ反力によるモーメントを受け、振動子の駆動効率を低下させてしまうという課題が有る。 However, in Patent Document 1 described above, it is necessary to distribute the wiring board connected to the piezoelectric element from the side surface in the moving direction of the vibrator, and the vibrator supporting member guides the movement of the wiring board. At that time, there is a problem that the vibrator supporting member receives a moment due to the bending reaction force of the wiring board, and the driving efficiency of the vibrator is reduced.

そこで、本発明の目的は、簡単な構成で駆動効率を一定に保つことが可能な振動波モータを提供することにある。 Therefore, it is an object of the present invention to provide a vibration wave motor capable of maintaining a constant driving efficiency with a simple structure.

上記の目的を達成するために、本発明に係る振動波モータは、
圧電素子と振動体からなる振動子と、前記圧電素子に接続される配線基板と、前記振動子と摩擦接触する摩擦部材と、前記振動子を保持する振動子保持部材と、該振動子保持部材と前記摩擦部材とを保持するベース部材とを備え、前記振動子に発生する超音波振動により前記振動子と前記摩擦部材が相対移動する振動波モータであって、前記振動子保持部材は、前記振動子と前記摩擦部材の相対移動に伴う前記配線基板の移動を案内する第1のガイド部を備え、前記ベース部材は、前記第1のガイド部と対向した位置に配置され、前記振動子と前記摩擦部材の相対移動に伴う前記配線基板の移動を案内する第2のガイド部を備え、前記第1のガイド部と前記第2のガイド部の間隔は、前記振動子と前記摩擦部材の相対移動方向において、前記振動子の中央部から離れることに伴い広がることを特徴とする。
In order to achieve the above object, a vibration wave motor according to the present invention,
A vibrator including a piezoelectric element and a vibrating body, a wiring substrate connected to the piezoelectric element, a friction member that makes frictional contact with the vibrator, a vibrator holding member that holds the vibrator, and the vibrator holding member And a base member for holding the friction member, wherein the vibrator and the friction member are moved relative to each other by ultrasonic vibration generated in the vibrator, and the vibrator holding member is A first guide part that guides the movement of the wiring board associated with the relative movement of the vibrator and the friction member; the base member is arranged at a position facing the first guide part; A second guide portion is provided for guiding the movement of the wiring board due to the relative movement of the friction member, and a distance between the first guide portion and the second guide portion is set to be relative to the vibrator and the friction member. In the moving direction, it spreads away from the central portion of the vibrator.

本発明によれば、簡単な構成で駆動効率を一定に保つことが可能な振動波モータを提供することができる。 According to the present invention, it is possible to provide a vibration wave motor capable of maintaining constant drive efficiency with a simple configuration.

本発明の実施形態1が適用できる撮像装置の断面図Sectional drawing of the imaging device to which Embodiment 1 of this invention can be applied. (a)は本発明が適用できる振動波モータの斜視図、(b)は本発明が適用できる振動波モータの斜視図、(c)は本発明が適用できる振動波モータの分解斜視図(A) is a perspective view of a vibration wave motor to which the present invention is applicable, (b) is a perspective view of a vibration wave motor to which the present invention is applicable, and (c) is an exploded perspective view of a vibration wave motor to which the present invention is applicable. (a)は本発明が適用できる振動波モータの−Z方向矢視図、(b)は本発明が適用できる振動波モータの+Y方向矢視図、(c)は本発明が適用できる振動波モータの+Y方向矢視図(A) is a -Z direction arrow view of a vibration wave motor to which the present invention is applicable, (b) is a +Y direction arrow view of a vibration wave motor to which the present invention is applicable, and (c) is a vibration wave to which the present invention is applicable. Motor +Y direction view (a)は本発明が適用できる振動波モータの部分拡大図、(b)は本発明が適用できる振動波モータの部分拡大図(A) is a partially enlarged view of a vibration wave motor to which the present invention is applicable, and (b) is a partially enlarged view of a vibration wave motor to which the present invention is applicable. (a)は本発明が適用できる振動波モータの+Y方向矢視図、(b)は本発明が適用できる振動波モータの部分拡大図、(c)は本発明が適用できる振動波モータの+Y方向矢視図(A) is a +Y direction arrow view of a vibration wave motor to which the present invention is applicable, (b) is a partially enlarged view of a vibration wave motor to which the present invention is applicable, and (c) is +Y of a vibration wave motor to which the present invention is applicable. Direction arrow view

以下に、本発明の好ましい実施の形態を、添付の図面に基づいて詳細に説明する。 Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

図1は本発明を適用可能な撮像装置の構成を表している。尚、本説明において、振動波モータが撮像装置に搭載された場合について説明するが、本発明を限定するものではない。また、後述の撮像レンズ部1とカメラボディ2が一体となっている撮像装置について説明をするが、撮像レンズ部1は交換可能なレンズであっても構わない。 FIG. 1 shows the configuration of an image pickup apparatus to which the present invention can be applied. In the present description, the case where the vibration wave motor is mounted on the imaging device will be described, but the present invention is not limited thereto. Further, although an image pickup apparatus in which the image pickup lens unit 1 and the camera body 2 are integrated will be described below, the image pickup lens unit 1 may be a replaceable lens.

図1において、撮像レンズ部1と、カメラボディ2によって撮像装置本体が形成されている。撮像レンズ部1の内部において、合焦レンズ4は振動波モータ3と連結されており、後述する振動波モータ3を構成する振動子が移動することにより、合焦レンズは光軸6と略平行な方向に移動可能となる。撮像時には合焦レンズが光軸6と略平行な方向に移動し、被写体像は撮像素子5の位置で結像し、合焦した像を生成することが可能となる。 In FIG. 1, the imaging lens unit 1 and the camera body 2 form an imaging device body. The focusing lens 4 is connected to the vibration wave motor 3 inside the imaging lens unit 1, and the focusing lens is substantially parallel to the optical axis 6 by the movement of a vibrator forming the vibration wave motor 3 described later. It is possible to move in any direction. At the time of image pickup, the focusing lens moves in a direction substantially parallel to the optical axis 6, and the subject image is formed at the position of the image pickup device 5, so that a focused image can be generated.

図2は本発明を適用可能な振動波モータ3の構成を示している。図2(a)は振動波モータ3の全容を示す為の斜視図を表している。図2(b)は図2(a)から後述する摩擦部材101、振動子104、ベース部材110、配線基板115以外を除き、内部構成を分かりやすくした斜視図である。また、図2(c)は分解斜視図を表している。 FIG. 2 shows the configuration of a vibration wave motor 3 to which the present invention can be applied. FIG. 2A is a perspective view showing the whole of the vibration wave motor 3. 2B is a perspective view in which the internal configuration is made easy to understand, except for the components other than the friction member 101, the vibrator 104, the base member 110, and the wiring board 115, which will be described later from FIG. 2A. In addition, FIG. 2C shows an exploded perspective view.

本実施例における振動波モータ3は、以下に述べる各部材により形成されている。振動子104は弾性体としての振動板102と圧電素子103とにより構成されている。振動板102と圧電素子103は公知の接着材等により固定されている。圧電素子103には配線基板115が接続され、圧電素子103は電圧を印加することにより超音波振動を励振する。圧電素子103に超音波振動を励振させることで、振動子104に共振が起こる。このとき振動子104には2種の定在波からなる略楕円運動が発生する。 The vibration wave motor 3 in the present embodiment is formed by each member described below. The vibrator 104 is composed of a diaphragm 102 as an elastic body and a piezoelectric element 103. The diaphragm 102 and the piezoelectric element 103 are fixed by a known adhesive material or the like. A wiring substrate 115 is connected to the piezoelectric element 103, and the piezoelectric element 103 excites ultrasonic vibration by applying a voltage. By vibrating the piezoelectric element 103 with ultrasonic vibration, resonance occurs in the vibrator 104. At this time, a substantially elliptical motion of two types of standing waves is generated in the oscillator 104.

振動子104と振動子保持部材106とは、公知の接着剤等により固定されているが、固定されればその方法は限定されない。更に、振動子保持部材106は被駆動体と連結される不図示の動力取り出し部を備えるが、本説明では省略する。また、振動子保持部材106は、後述する第1の案内部107を備えるが、ここでは省略する。 The vibrator 104 and the vibrator holding member 106 are fixed by a known adhesive or the like, but the method is not limited as long as they are fixed. Further, the vibrator holding member 106 includes a power take-out portion (not shown) that is connected to the driven body, but is omitted in this description. Further, the vibrator holding member 106 includes a first guide portion 107, which will be described later, but is omitted here.

摩擦部材101とレールプレート112は不図示のネジ等によりベース部材110に固定されている。ベース部材110は更に、後述する第2の案内部111を備えるが、ここでは省略する。レールプレート112は3つの固定案内部を備えている。一方、可動プレート114は3つの移動案内部を備えている。それぞれ対応する案内部の間で転動ボール113が狭持されている。尚、本実施例においては上記レールプレート112が備える3つの溝の内、2つはV溝、1つは有底の平面溝となっているが、転動ボール113が転動出来る溝で有れば構わない。 The friction member 101 and the rail plate 112 are fixed to the base member 110 with screws or the like (not shown). The base member 110 further includes a second guide portion 111, which will be described later, but is omitted here. The rail plate 112 includes three fixed guide portions. On the other hand, the movable plate 114 has three movement guides. Rolling balls 113 are sandwiched between the corresponding guide portions. In the present embodiment, among the three grooves provided on the rail plate 112, two are V-shaped grooves and one is a flat groove with a bottom, but there are grooves in which the rolling balls 113 can roll. I don't care.

振動子保持部材106は更に、可動プレート114と不図示のネジ等で固定される。バネ108は振動子104を囲う様に4方向に配置されている。バネ108の両端は、付勢部材109及び可動プレート114がそれぞれ備える固定部に固定されている。弾性部材105が圧電素子103と付勢部材109との間に配置されている。弾性部材105は、付勢部材109と圧電素子103との直接接触を妨げ、圧電素子103の損傷を防止している。バネ108の加圧力は弾性部材105を介し、振動子104を摩擦部材101に付勢する加圧力となる。 The oscillator holding member 106 is further fixed to the movable plate 114 with screws (not shown) or the like. The springs 108 are arranged in four directions so as to surround the vibrator 104. Both ends of the spring 108 are fixed to fixed portions included in the biasing member 109 and the movable plate 114, respectively. The elastic member 105 is arranged between the piezoelectric element 103 and the biasing member 109. The elastic member 105 prevents direct contact between the biasing member 109 and the piezoelectric element 103 and prevents the piezoelectric element 103 from being damaged. The pressing force of the spring 108 acts as a pressing force for urging the vibrator 104 toward the friction member 101 via the elastic member 105.

そして、振動板102は摩擦部材101に対し加圧された状態で接触する。この加圧接触状態において圧電素子103に駆動電圧が印加されると、振動子104に発生した楕円運動が効率的に摩擦部材101へ伝達する。その結果、振動子104、振動子保持部材106、弾性部材105、付勢部材109、バネ108、可動プレート114で構成される移動部120は、光軸6と略平行である矢印121の方向に相対移動可能となる。 Then, the vibration plate 102 contacts the friction member 101 in a pressurized state. When a drive voltage is applied to the piezoelectric element 103 in this pressure contact state, the elliptical motion generated in the vibrator 104 is efficiently transmitted to the friction member 101. As a result, the moving portion 120 including the vibrator 104, the vibrator holding member 106, the elastic member 105, the biasing member 109, the spring 108, and the movable plate 114 moves in the direction of the arrow 121 that is substantially parallel to the optical axis 6. Relative movement is possible.

次に図2、図3、図4を用いて振動波モータ3内部における、配線基板115の配回しについて説明する。 Next, with reference to FIG. 2, FIG. 3, and FIG. 4, the distribution of the wiring board 115 inside the vibration wave motor 3 will be described.

図3は本発明が適用可能な振動波モータ3の構成を表している。それぞれ図3(a)振動波モータ3の−Z方向矢視図、図3(b)+Y方向矢視図を表しており、図3(c)は移動部120が相対移動した様子を表している。図4は配線基板115の折り曲げ部の拡大図を表しており、図4(a)、(b)はそれぞれ図3(a)、(b)の状態の拡大図である。尚、説明を簡単にする為、説明に不要な部品を除いている。 FIG. 3 shows a configuration of a vibration wave motor 3 to which the present invention can be applied. 3(a) is a view in the -Z direction and FIG. 3(b) is a view in the +Y direction of the vibration wave motor 3, and FIG. 3(c) shows a state in which the moving unit 120 relatively moves. There is. FIG. 4 shows an enlarged view of the bent portion of the wiring board 115, and FIGS. 4(a) and 4(b) are enlarged views of the states of FIGS. 3(a) and 3(b), respectively. In addition, in order to simplify the description, unnecessary parts are omitted.

先述の通り、配線基板115は圧電素子103に接続される。圧電素子103は配線基板115を介して不図示のメイン基盤等から給電され、超音波振動を励振することが可能となる。 As described above, the wiring board 115 is connected to the piezoelectric element 103. The piezoelectric element 103 is supplied with power from a main board (not shown) or the like via the wiring board 115, and can excite ultrasonic vibrations.

配線基板115は圧電素子103の中央部、つまり振動子中央部130を中心に接続され、振動子104の移動を阻害しないよう、側面に延出している。配線基板115は図2(b)に示される、固定範囲122において、ベース部材110に固定されている。固定範囲122は振動子104が移動した場合においても固定され続けている。振動子104が移動する際、配線基板115にテンションがかからないようにするため、図2(c)に示されるように矢印121方向に折り曲げられている。 The wiring board 115 is connected around the central portion of the piezoelectric element 103, that is, the vibrator central portion 130, and extends to the side surface so as not to hinder the movement of the vibrator 104. The wiring board 115 is fixed to the base member 110 in the fixing range 122 shown in FIG. The fixed range 122 continues to be fixed even when the vibrator 104 moves. When the vibrator 104 moves, it is bent in the direction of arrow 121 as shown in FIG. 2C so that tension is not applied to the wiring board 115.

折り曲げにより形成される円弧の中心は、振動子104の移動に伴い、可動範囲123の領域内で、振動子104の移動方向と同じ方向に移動する。しかし、円弧中心の移動量は振動子104の移動量の約半分である為、振動子中央部130と円弧中心131までの距離Lは変化し、接近または離間をする。 The center of the arc formed by bending moves in the same direction as the moving direction of the vibrator 104 within the movable range 123 as the vibrator 104 moves. However, since the movement amount of the circular arc center is about half the movement amount of the vibrator 104, the distance L between the vibrator central portion 130 and the circular arc center 131 changes, and approaches or separates.

配線基板115のY方向の位置がずれ、他部品と干渉しないように、配線基板115の移動を案内する必要が有る。本発明では図2、図3、図4に示されるように、振動子保持部材106が備える第1の案内部107と、ベース部材110が備える第2の案内部111がそれぞれ対向する位置に構成されている。第1の案内部107と第2の案内部111により配線基板115の移動を案内する構成となっている。 It is necessary to guide the movement of the wiring board 115 so that the position of the wiring board 115 in the Y direction does not shift and interfere with other components. In the present invention, as shown in FIG. 2, FIG. 3, and FIG. 4, the first guide portion 107 included in the vibrator holding member 106 and the second guide portion 111 included in the base member 110 are arranged at positions facing each other. Has been done. The first guide portion 107 and the second guide portion 111 guide the movement of the wiring board 115.

先述の通り、配線基板115は矢印121方向に折り曲げられている。しかし、この配線基板115の折り曲げ部においては、第1の案内部107と、第2の案内部111のZ方向間隔で決まる円弧半径を大きくしようとする方向に曲げ反力Fが働く。曲げ反力Fは以下の式(1)で簡易的に表現することが出来る。 As described above, the wiring board 115 is bent in the direction of the arrow 121. However, in the bent portion of the wiring board 115, the bending reaction force F acts in a direction to increase the arc radius determined by the Z-direction interval between the first guide portion 107 and the second guide portion 111. The bending reaction force F can be simply expressed by the following equation (1).

ここで、δはZ方向の変位量、Eは縦弾性係数、Iは断面2次モーメント、rは円弧半径を表している。また、説明を簡単にする為、直線部長さ等で決まる項をAと置いている。
この曲げ反力Fは第1の案内部107と、第2の案内部111で受けている。
Here, δ is the amount of displacement in the Z direction, E is the longitudinal elastic modulus, I is the second moment of area, and r is the arc radius. Further, for simplicity of explanation, the term determined by the length of the straight line portion or the like is set as A.
The bending reaction force F is received by the first guide portion 107 and the second guide portion 111.

振動子104が移動した場合においても、曲げ反力Fは変わらない。しかし、振動子中央部130と円弧中心131の距離Lは変化をするため、曲げ反力F×距離Lで決まるモーメントMは変化をする。図3(c)のように、振動子中央部130と円弧中心131の距離Lが最大となるときに、モーメントMは最大となる。モーメントMは振動子中央部130を略中心とし、図4(a)に表される方向に働く。 Even when the oscillator 104 moves, the bending reaction force F does not change. However, since the distance L between the vibrator central portion 130 and the arc center 131 changes, the moment M determined by the bending reaction force F×distance L changes. As shown in FIG. 3C, the moment M becomes maximum when the distance L between the vibrator central portion 130 and the arc center 131 becomes maximum. The moment M acts in the direction shown in FIG. 4A, with the central portion 130 of the vibrator being substantially the center.

第1の案内部107を備える振動子保持部材106は、振動子104を保持している。その為、特に図3(c)のように、振動子中央部130と円弧中心131の距離Lが離れ、モーメントMが大きい領域において、第1の案内部107がモーメントMの影響により撓み、振動子104の駆動を阻害するという課題が有った。 The vibrator holding member 106 including the first guide portion 107 holds the vibrator 104. Therefore, in particular, as shown in FIG. 3C, in a region where the distance L between the vibrator central portion 130 and the arc center 131 is large and the moment M is large, the first guide portion 107 bends and vibrates due to the influence of the moment M. There is a problem that the drive of the child 104 is hindered.

そこで本発明においては、第1の案内部107と第2の案内部111のZ方向の間隔は、振動子中央部130から矢印121方向に離れることに伴い、広がることを特徴としている。 Therefore, the present invention is characterized in that the distance between the first guide portion 107 and the second guide portion 111 in the Z direction increases as the distance from the vibrator central portion 130 in the arrow 121 direction increases.

図4(b)に示される破線140は、第1の案内部107と第2の案内部111のZ方向の間隔が一定の場合の配線基板115の様子を表している。図からわかるように、破線140の状態の方が円弧半径は小さく、式(1)で表される配線基板115の曲げ反力Fは大きくなる。しかし、本発明の様に第1の案内部107と第2の案内部111のZ方向の間隔を広げることによって曲げ反力Fは小さくすることが可能になる。先述したように振動子中央部130と円弧中心131の間の距離Lが長くなると、モーメントMが大きくなる。また、曲げ反力Fが小さくなるとモーメントMは小さくなる。よって、距離Lが長くなる範囲において、曲げ反力Fを小さくすることで、モーメントMを小さくすることが出来る。 A broken line 140 shown in FIG. 4B represents the state of the wiring board 115 when the distance between the first guide portion 107 and the second guide portion 111 in the Z direction is constant. As can be seen from the figure, the arc radius is smaller and the bending reaction force F of the wiring board 115 expressed by the equation (1) is larger in the state of the broken line 140. However, as in the present invention, the bending reaction force F can be reduced by increasing the distance between the first guide portion 107 and the second guide portion 111 in the Z direction. As described above, as the distance L between the vibrator central portion 130 and the arc center 131 increases, the moment M increases. Further, when the bending reaction force F becomes smaller, the moment M becomes smaller. Therefore, the moment M can be reduced by reducing the bending reaction force F in the range where the distance L is long.

そのように構成することで、モーメントMによる第1の案内部107への影響を低減し、振動子104の駆動効率を一定に保つことが可能になる。 With such a configuration, it is possible to reduce the influence of the moment M on the first guide portion 107 and keep the drive efficiency of the vibrator 104 constant.

振動子104の可動範囲全域で第1の案内部107と第2の案内部111のZ方向の間隔を広げることは、振動波モータ3のZ方向の大型化、または部品の剛性低下や成型性の低下を招く。その為、本発明では振動子中央部130と円弧中心131の距離Lに応じて、円弧半径を大きくしている。そのように構成することで、外形寸法や部品強度、成型性と、振動子104の駆動効率の向上を両立することが可能となる。 Increasing the distance between the first guide portion 107 and the second guide portion 111 in the Z direction in the entire movable range of the vibrator 104 increases the size of the vibration wave motor 3 in the Z direction, reduces the rigidity of parts, and improves moldability. Cause a decrease in Therefore, in the present invention, the arc radius is increased according to the distance L between the vibrator central portion 130 and the arc center 131. With such a configuration, it is possible to achieve both the external dimensions, the component strength, the moldability, and the improvement of the driving efficiency of the vibrator 104.

また、第1の案内部107と第2の案内部111のZ方向の間隔の変化が急峻な場合には、変化の際に不要振動が発生し、振動子104の駆動を阻害する懸念が有る。その為、第1の案内部107と第2の案内部111のZ方向の間隔の変化は、連続的な変化であることが望ましい。 Further, when the change in the Z-direction distance between the first guide portion 107 and the second guide portion 111 is abrupt, there is a concern that unnecessary vibration may occur during the change and the drive of the vibrator 104 may be hindered. .. Therefore, it is desirable that the change in the Z-direction distance between the first guide portion 107 and the second guide portion 111 be a continuous change.

図5はベース部材110が備える第2の案内部111の形状を変化させ、第1の案内部107と第2の案内部111の間隔を−Z方向に広げた場合の図を表している。図5(a)は図3(c)と同じ位置での状態を表しており、図5(b)は図5(a)の拡大図である。図5(c)は図5(a)の反対方向に移動した状態を表している。 FIG. 5 shows a diagram in which the shape of the second guide portion 111 included in the base member 110 is changed to widen the distance between the first guide portion 107 and the second guide portion 111 in the −Z direction. FIG. 5A shows the state at the same position as FIG. 3C, and FIG. 5B is an enlarged view of FIG. 5A. FIG. 5C shows a state of moving in the opposite direction of FIG.

図5(a)、(b)に表されるように、ベース部材110が備える第2の案内部111の形状を変化させることでも、円弧半径を変化させることが可能である。しかし、図5(a)から図5(c)の方向へ移動しようとする時、配線基板115の円弧が損傷しないよう、第2の案内部111は連続的で滑らかに第1の案内部107との間隔を変えていく必要が有る。その為、図5(b)に表されるように、広い範囲で凹ませる必要が有り、部品剛性の低下が懸念される。 As shown in FIGS. 5A and 5B, the arc radius can also be changed by changing the shape of the second guide portion 111 included in the base member 110. However, the second guide part 111 is continuous and smooth so that the circular arc of the wiring board 115 is not damaged when moving from the direction of FIG. 5A to the direction of FIG. 5C. It is necessary to change the interval between and. Therefore, as shown in FIG. 5B, it is necessary to make recesses in a wide range, and there is a concern that the rigidity of the parts may be reduced.

また、図5(c)の状態において、配線基板115は折り曲がっていない状態を保とうとする為、上述の凹み形状にならおうとしない。そして、凹み形状の上部で配線基板115は振動しやすく、接触と離間を繰り返すことによる鳴きが懸念される。 Further, in the state shown in FIG. 5C, the wiring board 115 tries to maintain a state in which it is not bent, and therefore does not try to have the above-mentioned recessed shape. The wiring board 115 is likely to vibrate at the upper part of the recessed shape, and there is a concern that squeaking may occur due to repeated contact and separation.

その為、本発明では振動子保持部材106が備える第1の案内部107の形状を変化させることで、第1の案内部107と第2の案内部111のZ方向の間隔を広げている。 Therefore, in the present invention, by changing the shape of the first guide portion 107 included in the vibrator holding member 106, the distance between the first guide portion 107 and the second guide portion 111 in the Z direction is widened.

以上により、本発明によれば、簡単な構成で駆動効率を一定に保つことが可能となる振動波モータを提供することができる。 As described above, according to the present invention, it is possible to provide the vibration wave motor capable of keeping the driving efficiency constant with a simple configuration.

以上、本発明の好ましい実施形態について説明したが、本発明はこれらの実施形態に限定されず、その要旨の範囲内で種々の変形及び変更が可能である。 Although the preferred embodiments of the present invention have been described above, the present invention is not limited to these embodiments, and various modifications and changes can be made within the scope of the gist thereof.

1 撮影レンズ部、2 カメラボディ、3 振動波モータ、4 合焦レンズ、
5 撮像素子、6 光軸、7 撮像素子、101 摩擦部材、102 振動板、
103 圧電素子、104 振動子、105 弾性部材、106 振動子保持部材、
107 第1の案内部、108 バネ、109 付勢部材、110 ベース部材、
111 第2の案内部、112 レールプレート、113 転動部材、
114 可動プレート、115 配線基板、120 移動部、122 固定範囲、
123 可動範囲、130 振動子中央部、131 円弧中心
1 shooting lens part, 2 camera body, 3 vibration wave motor, 4 focusing lens,
5 image sensor, 6 optical axis, 7 image sensor, 101 friction member, 102 diaphragm,
103 piezoelectric element, 104 oscillator, 105 elastic member, 106 oscillator holding member,
107 first guide portion, 108 spring, 109 biasing member, 110 base member,
111 second guide portion, 112 rail plate, 113 rolling member,
114 movable plate, 115 wiring board, 120 moving part, 122 fixed range,
123 Movable range, 130 Vibrator center, 131 Arc center

Claims (3)

圧電素子と振動体からなる振動子と、
前記圧電素子に接続される配線基板と、
前記振動子と摩擦接触する摩擦部材と、
前記振動子を保持する振動子保持部材と、
該振動子保持部材と前記摩擦部材とを保持するベース部材と、を備え、
前記振動子に発生する超音波振動により前記振動子と前記摩擦部材が相対移動する振動波モータであって、
前記振動子保持部材は、前記振動子と前記摩擦部材の相対移動に伴う前記配線基板の移動を案内する第1のガイド部を備え、
前記ベース部材は、前記第1のガイド部と対向した位置に配置され、前記振動子と前記摩擦部材の相対移動に伴う前記配線基板の移動を案内する第2のガイド部を備え、
前記第1のガイド部と前記第2のガイド部の間隔は、前記振動子と前記摩擦部材の相対移動方向において、前記振動子の中央部から離れることに伴い広がることを特徴とする振動波モータ。
A vibrator consisting of a piezoelectric element and a vibrating body,
A wiring board connected to the piezoelectric element,
A friction member in frictional contact with the vibrator;
A vibrator holding member for holding the vibrator,
A base member that holds the vibrator holding member and the friction member,
A vibration wave motor in which the vibrator and the friction member are relatively moved by ultrasonic vibration generated in the vibrator,
The vibrator holding member includes a first guide portion that guides the movement of the wiring board due to the relative movement of the vibrator and the friction member,
The base member is provided at a position facing the first guide portion, and includes a second guide portion that guides movement of the wiring board due to relative movement of the vibrator and the friction member,
An interval between the first guide part and the second guide part widens in the relative movement direction of the vibrator and the friction member as the distance from the central part of the vibrator increases. ..
前記間隔は、前記第1のガイド部側に広がることを特徴とする請求項1に記載の振動波モータ。 The vibration wave motor according to claim 1, wherein the gap is widened toward the first guide portion side. 前記間隔は、連続的に変化していることを特徴とする請求項1又は2に記載の振動波モータ。 The vibration wave motor according to claim 1 or 2, wherein the interval is continuously changed.
JP2018240487A 2018-12-25 2018-12-25 Vibration wave motor Pending JP2020102971A (en)

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