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JP2019066820A - Position detection unit, drive unit, lens drive unit, optical device, camera device, and electronic device - Google Patents

Position detection unit, drive unit, lens drive unit, optical device, camera device, and electronic device Download PDF

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JP2019066820A
JP2019066820A JP2018112165A JP2018112165A JP2019066820A JP 2019066820 A JP2019066820 A JP 2019066820A JP 2018112165 A JP2018112165 A JP 2018112165A JP 2018112165 A JP2018112165 A JP 2018112165A JP 2019066820 A JP2019066820 A JP 2019066820A
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drive
hall element
current
output
position detection
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JP6662955B2 (en
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寺嶋　厚吉
Kokichi Terajima
厚吉 寺嶋
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New Shicoh Motor Co Ltd
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
    • G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
    • G01D5/12—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means
    • G01D5/14—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage
    • G01D5/142—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage using Hall-effect devices
    • G01D5/145—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage using Hall-effect devices influenced by the relative movement between the Hall device and magnetic fields
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
    • G02B7/02—Mountings, adjusting means, or light-tight connections, for optical elements for lenses
    • G02B7/04—Mountings, adjusting means, or light-tight connections, for optical elements for lenses with mechanism for focusing or varying magnification
    • G02B7/09—Mountings, adjusting means, or light-tight connections, for optical elements for lenses with mechanism for focusing or varying magnification adapted for automatic focusing or varying magnification
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B13/00—Viewfinders; Focusing aids for cameras; Means for focusing for cameras; Autofocus systems for cameras
    • G03B13/32—Means for focusing
    • G03B13/34—Power focusing
    • G03B13/36—Autofocus systems

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)
  • Lens Barrels (AREA)
  • Camera Bodies And Camera Details Or Accessories (AREA)
  • Studio Devices (AREA)
  • Adjustment Of Camera Lenses (AREA)
  • Measuring Magnetic Variables (AREA)

Abstract

To provide a position detection unit which offers good temperature characteristics and can be miniaturized, and to provide a drive unit, lens drive unit, camera device, and electronic device having the same.SOLUTION: A position detection device 56 comprises: a Hall device 54 configured to move relative to position detection magnets along with drive coils 46; current supply means configured to supply the drive coils 46 with a predetermined AC current superimposed on a drive current; and control means configured to provide control to keep (the amplitude of) an AC signal output of the Hall element 54 constant in response to the predetermined AC current.SELECTED DRAWING: Figure 4

Description

本発明は、位置検出装置、駆動装置、レンズ駆動装置、光学装置、カメラ装置及び電子機器に関する。   The present invention relates to a position detection device, a drive device, a lens drive device, an optical device, a camera device, and an electronic apparatus.

ホール素子を用いた位置検出装置が従来から知られている。ところが、ホール素子は温度による出力の変動が比較的大きく、そのため、温度センサを配置したり（特許文献１）、複数のホール素子を配置したり（特許文献２）して、温度による出力の変動を抑止してきた。   A position detection device using a Hall element is conventionally known. However, the Hall element has a relatively large fluctuation in output due to temperature, and therefore, the temperature sensor may be arranged (Patent Document 1) or a plurality of Hall elements may be arranged (Patent Document 2), and the output fluctuation due to temperature Have been deterred.

特開２０１３−２０５５５０号公報JP 2013-205550 A 特開２０１３−０８３５９７号公報JP, 2013-083597, A

従来の位置検出装置ではセンサ数が多く、小型化が困難であった。
本発明は、上記従来の課題を解決するものであり、温度特性が良く、小型化を図ることができる位置検出装置、駆動装置、レンズ駆動装置、光学装置、カメラ装置及び電子機器を提供することを目的とする。 In the conventional position detection device, the number of sensors is large, and downsizing is difficult.
The present invention solves the above-described conventional problems, and provides a position detection device, a drive device, a lens drive device, an optical device, a camera device, and an electronic device that have good temperature characteristics and can be miniaturized. With the goal.

本発明の一つの態様は位置検出装置であり、この位置検出装置は、駆動コイルと共に位置検出用磁石に対して移動するホール素子と、駆動電流に重畳して所定の交流電流を前記駆動コイルに供給する電流供給手段と、前記所定の交流電流に対応する前記ホール素子の交流信号の出力を一定になるよう制御する制御手段と、を有する。   One aspect of the present invention is a position detection device, which comprises a Hall element moving with respect to a position detection magnet together with a drive coil, and a predetermined alternating current superimposed on a drive current to the drive coil. It has the current supply means to supply, and the control means which controls so that the output of the alternating current signal of the said Hall element corresponding to the said predetermined | prescribed alternating current may become fixed.

制御手段は、具体的には、前記ホール素子の交流信号の出力を基に前記ホール素子に供給するバイアス電流を制御するか、又は前記ホール素子から出力される出力電圧を制御する。   Specifically, the control means controls a bias current supplied to the Hall element based on an output of an AC signal of the Hall element, or controls an output voltage output from the Hall element.

また、好適には、前記制御手段は、前記ホール素子の信号出力から前記交流信号の出力を分離し、分離された前記交流信号の出力をフィードバックする。   Also, preferably, the control means separates the output of the alternating current signal from the signal output of the Hall element, and feeds back the separated output of the alternating current signal.

さらに具体的には、前記制御手段は、帯域通過濾波器、検波回路及び可変利得増幅回路を備え、前記ホール素子の出力は前記帯域通過濾波器を通して前記ホール素子の交流信号の出力として前記検波回路に入力され、前記検波回路の出力が前記可変利得増幅回路を通してフィードバックされる。   More specifically, the control means includes a band pass filter, a detection circuit, and a variable gain amplifier circuit, and the output of the Hall element is the output of the Hall element as an output of the AC signal of the Hall element through the band pass filter. And the output of the detection circuit is fed back through the variable gain amplification circuit.

本発明の他の態様は駆動装置であり、この駆動装置は、駆動磁石と、前記駆動磁石に対向する駆動コイルと、前記駆動コイルと共に位置検出用磁石に対して移動するホール素子と、駆動電流に重畳して所定の交流電流を前記駆動コイルに供給する電流供給手段と、前記所定の交流電流に対応する前記ホール素子の交流信号の出力を一定になるよう制御する制御手段と、を有する。   Another aspect of the present invention is a drive device, which comprises a drive magnet, a drive coil facing the drive magnet, a Hall element which moves with the drive coil with respect to a position detection magnet, and a drive current And supply means for supplying a predetermined alternating current to the drive coil, and control means for controlling the output of the alternating current signal of the Hall element corresponding to the predetermined alternating current to be constant.

また、本発明の他の態様はレンズ駆動装置又は光学装置であり、このレンズ駆動装置又は光学装置は、駆動磁石と、前記駆動磁石に対向する駆動コイルと、前記駆動磁石又は前記駆動コイルが固定され、レンズを支持するレンズ支持体又は光学素子を支持する光学素子支持体と、前記駆動コイルと共に位置検出用磁石に対して移動するホール素子と、駆動電流に重畳して所定の交流電流を前記駆動コイルに供給する電流供給手段と、前記所定の交流電流に対応する前記ホール素子の交流信号の出力を一定になるよう制御する制御手段と、を有する。   Moreover, the other aspect of this invention is a lens drive device or an optical device, and this lens drive device or an optical device fixes a drive magnet, the drive coil which opposes the said drive magnet, the said drive magnet or the said drive coil. A lens support for supporting the lens or an optical element support for supporting the optical element, a Hall element for moving the position detection magnet together with the drive coil, and a predetermined alternating current superimposed on the drive current It has the current supply means supplied to a drive coil, and the control means which controls so that the output of the alternating current signal of the said Hall element corresponding to the said predetermined alternating current may become fixed.

本発明の他の態様はカメラ装置であり、このカメラ装置は、上述したレンズ駆動装置を有する。また、さらに他の態様は電子機器であり、この電子機器は、上述したカメラ装置を有する。   Another aspect of the present invention is a camera device, which has the above-described lens driving device. Still another aspect is an electronic device, and the electronic device includes the camera device described above.

本発明によれば、駆動コイルには駆動電流及び所定の交流電流が流され、所定の交流電流に対応するホール素子の交流信号の出力が一定となるように制御されるという構成にしたことにより、温度センサを設けたり、複数のホール素子を設けたりしなくても、ホール素子の感度の変化を補正できる。従って、温度特性が良く、小型化を図ることができる位置検出装置、駆動装置、レンズ駆動装置、光学装置、カメラ装置及び電子機器を提供することができるという効果が得られる。   According to the present invention, the drive current and the predetermined alternating current are supplied to the drive coil, and the output of the alternating current signal of the Hall element corresponding to the predetermined alternating current is controlled to be constant. The change in sensitivity of the Hall element can be corrected without providing a temperature sensor or providing a plurality of Hall elements. Therefore, it is possible to provide the position detection device, the drive device, the lens drive device, the optical device, the camera device, and the electronic device which have good temperature characteristics and can be miniaturized.

本発明の実施形態に係るカメラ装置を示す斜視図である。It is a perspective view showing a camera device concerning an embodiment of the present invention. 本発明の実施形態に係る駆動装置を示す一部を切り欠いた斜視図である。It is the perspective view which notched one part which shows the drive device which concerns on embodiment of this invention. 本発明の実施形態に用いた駆動磁石、駆動コイル及びホール素子を示す斜視図である。It is a perspective view which shows the drive magnet used for embodiment of this invention, a drive coil, and a Hall element. 本発明の第１実施形態に係る位置検出装置を示すブロック図である。It is a block diagram showing a position detection device concerning a 1st embodiment of the present invention. 本発明の第２実施形態に係る位置検出装置を示すブロック図である。It is a block diagram showing a position detecting device concerning a 2nd embodiment of the present invention.

次に本発明の実施形態を図面に基づいて説明する。   Next, an embodiment of the present invention will be described based on the drawings.

図１は、本発明の実施形態に係るカメラ装置１０を示す。
なお、この明細書においては、カメラ装置１０の光軸方向をＺ方向、光軸方向と直交し、互いに直交する方向をＸ方向及びＹ方向という。 FIG. 1 shows a camera device 10 according to an embodiment of the present invention.
In this specification, the optical axis direction of the camera device 10 is orthogonal to the Z direction and the optical axis direction, and the directions orthogonal to each other are referred to as the X direction and the Y direction.

カメラ装置１０は、オートフォーカスユニット１２と、このオートフォーカスユニットを駆動する駆動装置１４とを有する。駆動装置１４は、リンク機構１６と、駆動機構１８とを有して構成されている。   The camera device 10 has an auto focus unit 12 and a drive device 14 for driving the auto focus unit. The drive device 14 is configured to have a link mechanism 16 and a drive mechanism 18.

オートフォーカスユニット１２は、Ｚ方向から見て正方形の直方体状に形成されている。このオートフォーカスユニット１２は、周知のように、内部にレンズユニットを有し、このレンズユニットがＺ方向上下でばねに保持され、磁石、コイル、ヨーク等から構成された駆動部によりレンズユニットがＺ方向上下に動かされ、レンズユニットのＺ方向の位置を調節するようになっている。   The auto-focusing unit 12 is formed in a square rectangular parallelepiped shape as viewed from the Z direction. As is well known, this auto-focusing unit 12 has a lens unit inside, this lens unit is held by springs in the upper and lower directions in the Z direction, and the lens unit is Z by a drive unit composed of magnets, coils, yokes, etc. The lens unit is moved up and down to adjust the position of the lens unit in the Z direction.

リンク機構１６は、固定体側部材２０と、移動体側部材２２とを連結する。
固定体側部材２０は、四角枠状に形成された基台２４を有する。一方、移動体側部材２２も同様に四角枠状に形成された移動体保持部２６を有する。 The link mechanism 16 connects the fixed body side member 20 and the moving body side member 22.
The fixed body side member 20 has a base 24 formed in a square frame shape. On the other hand, the movable body side member 22 also has a movable body holding portion 26 similarly formed in a rectangular frame shape.

オートフォーカスユニット１２は、該オートフォーカスユニット１２の下面外周が移動体保持部２６の上面内周に固定されて移動体保持部２６に保持される。   The outer periphery of the lower surface of the autofocusing unit 12 is fixed to the inner periphery of the upper surface of the movable body holding portion 26 and the autofocusing unit 12 is held by the movable body holding portion 26.

固定体側部材２０は、基台２４と一体であるよう外縁部に形成された固定体側突出部２８を有する。この固定体側突出部２８は、基台２４の４つの辺部においてＺ方向上方へ突出して形成されている。   The fixed body side member 20 has a fixed body side projecting portion 28 formed on the outer edge so as to be integral with the base 24. The fixed body side protruding portion 28 is formed to project upward in the Z direction at four side portions of the base 24.

一方、移動体側部材２２は、移動体保持部２６と一体であるよう外縁角部に形成された移動体側突出部３０を有する。この移動体側突出部３０は、移動体保持部２６の４隅でＸ方向及びＹ方向とは４５度をなす方向に突出している。   On the other hand, the movable body side member 22 has the movable body side projecting portion 30 formed in the outer edge corner so as to be integral with the movable body holding portion 26. The movable body side protruding portion 30 protrudes at a direction forming 45 degrees with the X direction and the Y direction at four corners of the movable body holding portion 26.

リンク機構１６は、光軸を中心とする仮想円の回りに９０度間隔で循環配置されている４つの中間リンク３２ａ〜３２ｄ、８つの第１能動リンク３４ａ〜３４ｈ及び８つの第２能動リンク３６ａ〜３６ｈを有する。   The link mechanism 16 includes four intermediate links 32a to 32d, eight first active links 34a to 34h, and eight second active links 36a, which are circularly disposed at intervals of 90 degrees around an imaginary circle centered on the optical axis. It has ~ 36h.

４つの中間リンク３２ａ〜３２ｄは、基台２４及び移動体保持部２６の４つの辺に対応して棒状に形成されている。   The four intermediate links 32 a to 32 d are formed in a rod shape corresponding to the four sides of the base 24 and the movable body holding portion 26.

８つの第１能動リンク３４ａ〜３４ｈは、固定体側部材２０の固定体側突出部２８と中間リンク３２ａ〜３２ｄとをＺ方向で連結している。即ち、２つの第１能動リンク３４ａ，３４ｂは、固定体側部材２０の固定体側突出部２８の両端において固定体側部材２０の固定体側突出部２８と中間リンク３２ａとを連結し、２つの第１能動リンク３４ｃ，３４ｄは、固定体側部材２０の固定体側突出部２８の両端において固定体側部材２０の固定体側突出部２８と中間リンク３２ｂとを連結し、２つの第１能動リンク３４ｅ，３４ｆは、固定体側部材２０の固定体側突出部２８の両端において固定体側部材２０の固定体側突出部２８と中間リンク３２ｃとを連結し、２つの第１能動リンク３４ｇ，３４ｈは、固定体側部材２０の固定体側突出部２８の両端において固定体側部材２０の固定体側突出部２８と中間リンク３２ｄとを連結している。   The eight first active links 34 a to 34 h connect the stationary body side protruding portion 28 of the stationary body side member 20 and the intermediate links 32 a to 32 d in the Z direction. That is, the two first active links 34 a and 34 b connect the fixed body side projecting portion 28 of the fixed body side member 20 to the intermediate link 32 a at both ends of the fixed body side projecting portion 28 of the fixed body side member 20. The links 34c and 34d connect the fixed body side protruding portion 28 of the fixed body side member 20 to the intermediate link 32b at both ends of the fixed body side protruding portion 28 of the fixed body side member 20, and the two first active links 34e and 34f are fixed. The fixed body side projecting portion 28 of the fixed body side member 20 and the intermediate link 32 c are connected at both ends of the fixed body side projecting portion 28 of the body side member 20, and the two first active links 34 g and 34 h are the fixed body side protrusions of the fixed body side member 20 The fixed body side protruding portion 28 of the fixed body side member 20 and the intermediate link 32 d are connected at both ends of the portion 28.

８つの第２能動リンク３６ａ〜３６ｈは、移動体側部材２２の移動体側突出部３０と中間リンク３２ａ〜３２ｄとをＺ方向で連結している。即ち、２つの第２能動リンク３６ａ，３６ｂは、中間リンク３２ａの両端において移動体側部材２２の移動体側突出部３０と中間リンク３２ａとを連結し、２つの第２能動リンク３６ｃ，３６ｄは、中間リンク３２ｂの両端において移動体側部材２２の移動体側突出部３０と中間リンク３２ｂとを連結し、２つの第２能動リンク３６ｅ，３６ｆは、中間リンク３２ｃの両端において移動体側部材２２の移動体側突出部３０と中間リンク３２ｃとを連結し、２つの第１能動リンク３６ｇ，３６ｈは、中間リンク３２ｄの両端において移動体側部材２２の移動体側突出部３０と中間リンク３２ｄとを連結している。   The eight second active links 36 a to 36 h connect the moving body side protruding portion 30 of the moving body side member 22 and the intermediate links 32 a to 32 d in the Z direction. That is, the two second active links 36a and 36b connect the moving body side projecting portion 30 of the moving body side member 22 to the middle link 32a at both ends of the middle link 32a, and the two second active links 36c and 36d are middle The movable body side projecting portion 30 of the movable body side member 22 and the intermediate link 32b are connected at both ends of the link 32b, and the two second active links 36e and 36f are the movable body side projecting portions of the movable body side member 22 at both ends of the intermediate link 32c. 30 and the intermediate link 32c are connected, and the two first active links 36g and 36h connect the movable body side protrusion 30 of the movable body side member 22 and the intermediate link 32d at both ends of the intermediate link 32d.

移動体側部材２２は、固定体側部材２０に対して予め定められた間隔がＺ方向に空くようにリンク機構１６を介して支持されている。また、各第１能動リンク３４ａ〜３４ｈと各第２能動リンク３６ａ〜３６ｈの長さは等しくなるように設定されている。   The movable body side member 22 is supported via the link mechanism 16 so that a predetermined distance with respect to the fixed body side member 20 is in the Z direction. Further, the lengths of the first active links 34a to 34h and the second active links 36a to 36h are set to be equal.

図２において第１能動リンク３４ｈ及び第２能動リンク３６ｈを代表として示すように、第１能動リンク３４ａ〜３４ｈ及び第２能動リンク３６ａ〜３６ｈは、固定体側部材２０又は移動体側部材２２に接続される第１接続部３８、中間リンク３２ａ〜３２ｄに接続される第２接続部４０、及び第１接続部３８と第２接続部４０とを連結する連結部４２とから構成されている。連結部４２は円柱状であるが、第１接続部３８及び第２接続部４０は、両側の面が切り欠かれており、連結部４２よりも薄く形成されている。このため、切り欠かれた方向へは容易に揺動するが、切り欠かれた方向と直交する方向には揺動困難となる。即ち、第１能動リンク３４ａ〜３４ｈ及び第２能動リンク３６ａ〜３６ｈは、それぞれ移動容易軸と移動困難軸とを有する。即ち、第１接続部３８及び第２接続部４０は、移動困難軸方向よりも移動容易軸方向において薄く形成されている。   The first active links 34a to 34h and the second active links 36a to 36h are connected to the fixed body side member 20 or the movable body side member 22 so that the first active link 34h and the second active link 36h are representatively shown in FIG. The first connection portion 38, the second connection portion 40 connected to the intermediate links 32a to 32d, and the connection portion 42 connecting the first connection portion 38 and the second connection portion 40 are configured. The connecting portion 42 has a cylindrical shape, but the first connecting portion 38 and the second connecting portion 40 are notched on both sides, and are thinner than the connecting portion 42. For this reason, although it rock | fluctuates easily in the direction which was notched, it becomes difficult to rock | fluctuate in the direction orthogonal to the direction which was notched. That is, the first active links 34a to 34h and the second active links 36a to 36h have an easy-to-move axis and a hard-to-move axis, respectively. That is, the first connection portion 38 and the second connection portion 40 are formed thinner in the easy axis direction of movement than in the hard axis direction of movement.

第１能動リンク３４ａ，３４ｂ，３４ｅ，３４ｆは、Ｘ方向が移動容易軸で、Ｙ方向が移動困難軸である。第１能動リンク３４ｃ，３４ｄ，３４ｇ，３４ｈは、Ｘ方向が移動困難軸で、Ｙ方向が移動容易軸である。第２能動リンク３６ａ，３６ｂ，３６ｅ，３６ｆは、Ｘ方向が移動困難軸で、Ｙ方向が移動容易軸である。第２能動リンク３６ｃ，３６ｄ，３６ｇ，３６ｈは、Ｘ方向が移動容易軸で、Ｙ方向が移動困難軸である。   In the first active links 34a, 34b, 34e, 34f, the X direction is the easy movement axis, and the Y direction is the hard movement axis. In the first active links 34c, 34d, 34g and 34h, the X direction is a hard-to-move axis, and the Y direction is a easy-to-move axis. In the second active links 36a, 36b, 36e, and 36f, the X direction is a hard-to-move axis, and the Y direction is a easy-to-move axis. In the second active links 36c, 36d, 36g and 36h, the X direction is the easy movement axis, and the Y direction is the hard movement axis.

したがって、隣り合う中間リンク、例えば中間リンク３２ａと中間リンク３２ｂに接続される第１能動リンク３４ａ，３４ｂと第１能動リンク３４ｃ，３４ｄとは、移動容易軸及び移動困難軸がそれぞれ直交する。第２能動リンク３６ａ〜３６ｈも同様であり、例えば中間リンク３２ａと中間リンク３２ｂに接続される第２能動リンク３６ａ，３６ｂと第２能動リンク３６ｃ，３６ｄとは、移動容易軸及び移動困難軸がそれぞれ直交する。   Therefore, the easy moving axis and the hard moving axis of the intermediate links adjacent to each other, for example, the first active links 34a and 34b and the first active links 34c and 34d connected to the intermediate link 32a and the intermediate link 32b, are orthogonal to each other. The same applies to the second active links 36a to 36h. For example, the second active links 36a and 36b and the second active links 36c and 36d connected to the middle link 32a and the middle link 32b have easy moving axes and hard moving axes, respectively. They are orthogonal to each other.

一方、同じ中間リンク、例えば中間リンク３２ａに接続される第１能動リンク３４ａ，３４ｂと第２能動リンク３６ａ，３６ｂとは、移動容易軸及び移動困難軸がそれぞれ直交する。また、例えば、第１能動リンク３４ａ、３４ｂの移動容易軸と、第１能動リンク３４ａ、３４ｂが接続される中間リンク３２ａとは隣り合う中間リンク３２ｂに接続される第２能動リンク３６ｃ、３６ｄの移動容易軸は互いに平行である。   On the other hand, in the same intermediate link, for example, the first active link 34a, 34b connected to the intermediate link 32a and the second active link 36a, 36b, the easy movement axis and the hard movement axis are orthogonal to each other. Also, for example, of the second active links 36c and 36d connected to the intermediate link 32b adjacent to the easy movement axis of the first active links 34a and 34b and the intermediate link 32a to which the first active links 34a and 34b are connected. The easy axes of movement are parallel to one another.


駆動機構１８は、駆動磁石４４と駆動コイル４６とを有する。駆動磁石４４は位置検出用磁石を兼ねる。構成要素として駆動磁石４４と駆動コイル４６とは対となっており、上述したリンク機構１６に対応して４組設けられている。駆動磁石４４は、図３に示すように、板状に形成された２枚の磁石片４４ａ，４４ｂを重ねて構成されている。一方の磁石片４４ａ（又は４４ｂ）は＋Ｚ方向に磁化され、他方の磁石片４４ｂ（又は４４ａ）は−Ｚ方向に磁化されている。磁石４４は、中間リンク３２ａ〜３２ｄの下面に取り付けられており、中間リンク３２ａ〜３２ｄと固定体側部材２０との間に配置されている。また、それぞれの駆動磁石４４は、同じ中間リンク、例えば中間リンク３２ａにおいて、第１能動リンク３４ａ，３４ｂの間及び第２能動リンク３６ａ，３６ｂの間に配置されている。
The drive mechanism 18 has a drive magnet 44 and a drive coil 46. The drive magnet 44 doubles as a position detection magnet. As components, the drive magnet 44 and the drive coil 46 are paired, and four sets are provided corresponding to the link mechanism 16 described above. As shown in FIG. 3, the drive magnet 44 is configured by overlapping two plate-shaped magnet pieces 44a and 44b. One magnet piece 44a (or 44b) is magnetized in the + Z direction, and the other magnet piece 44b (or 44a) is magnetized in the -Z direction. The magnet 44 is attached to the lower surface of the intermediate links 32 a to 32 d and is disposed between the intermediate links 32 a to 32 d and the fixed body side member 20. Also, each drive magnet 44 is disposed between the first active links 34a, 34b and between the second active links 36a, 36b at the same intermediate link, for example the intermediate link 32a.

駆動コイル４６は、前述した固定体側突出部２８の上面に固定されている。このコイル４６は、図３にも示すように、２つの平行した直線部分と、この直線部分を接続する半円部分とから構成され、該駆動コイル４６の直線部分が駆動磁石４４の下面に対向している。   The drive coil 46 is fixed to the upper surface of the fixed body side protrusion 28 described above. As shown also in FIG. 3, the coil 46 is composed of two parallel straight portions and a semicircular portion connecting the straight portions, and the straight portion of the drive coil 46 faces the lower surface of the drive magnet 44. doing.

固定体側突出部２８の側面にはヨーク挿入用孔５０が長手方向に形成されている。このヨーク挿入孔５０には、磁性体からなるヨーク５２が挿入固定されている。したがって、磁石４４からの磁力線は、コイル４６を通り、ヨーク５２を介して再びコイル４６を通り、磁石４４へ戻る。   A yoke insertion hole 50 is formed on the side surface of the fixed body side protrusion 28 in the longitudinal direction. A yoke 52 made of a magnetic material is inserted into and fixed to the yoke insertion hole 50. Thus, the magnetic field lines from the magnet 44 pass through the coil 46, and again through the coil 46 via the yoke 52 back to the magnet 44.

ヨーク５２は、駆動磁石４４から駆動コイル４６への印加磁界を強めるとともに、中間リンク３２ａ〜３２ｄを吸引して、四角枠状に繋がった基台２４の中心を光軸の中心に維持する。   The yoke 52 strengthens the magnetic field applied from the drive magnet 44 to the drive coil 46 and attracts the intermediate links 32a to 32d to maintain the center of the base 24 connected in a square frame shape at the center of the optical axis.

駆動コイル４６の内周には、ホール素子５４が取り付けられている。ホール素子５４は、Ｘ方向、Ｙ方向にそれぞれ１つ設けられている。ただし、Ｘ方向、Ｙ方向にそれぞれ２つ設けて２つのホール素子５４の出力の平均をとるようにしてもよい。   A Hall element 54 is attached to the inner periphery of the drive coil 46. One Hall element 54 is provided in each of the X direction and the Y direction. However, two outputs may be provided in each of the X direction and the Y direction, and the outputs of the two Hall elements 54 may be averaged.

上記構成において、例えばＸ方向に配置された駆動コイル４６に直流駆動電流を流すと、駆動磁石４４にはＸ方向への電磁力（ローレンツ力）が作用し、中間リンク３２ａ，３２ｃをＸ方向へ動かす。中間リンク３２ａ，３２ｃがＸ方向へ動くと、Ｘ方向に移動困難軸を有する第２能動リンク３６ａ，３６ｂ，３６ｅ，３６ｆを介して移動体側部材２２及びオートフォーカスユニット１２をＸ方向へ動かす。移動体側部材２２のＸ方向の位置は、Ｘ方向に設けたホール素子５４により検出される。   In the above configuration, for example, when a DC drive current is supplied to the drive coil 46 disposed in the X direction, an electromagnetic force (Lorentz force) in the X direction acts on the drive magnet 44, and the intermediate links 32a and 32c are moved in the X direction. move. When the intermediate links 32a and 32c move in the X direction, the movable body side member 22 and the autofocusing unit 12 are moved in the X direction via the second active links 36a, 36b, 36e, and 36f having axes which are difficult to move in the X direction. The position of the movable body side member 22 in the X direction is detected by a Hall element 54 provided in the X direction.

中間リンク３２ａ，３２ｃがＸ方向へ動くと、第１能動リンク３４ａ，３４ｂ，３４ｅ，３４ｆはＸ方向に移動容易軸があるので、単に揺動するだけであり、固定体側部材２０に影響を与えない。また、移動体側部材２２がＸ方向へ動くと、第２能動リンク３６ｃ，３６ｄ，３６ｇ，３６ｈはＸ方向に移動容易軸があるので揺動するが、第１能動リンク３４ｃ，３４ｄ，３４ｇ，３４ｈはＸ方向に移動困難軸があるので、中間リンク３２ｂ，３２ｄはＸ方向及びＹ方向共に動かない。したがって、中間リンク３２ａ，３２ｃの動きに対して中間リンク３２ｂ，３２ｄは影響を受けない（干渉されない）。   When the intermediate links 32a and 32c move in the X direction, the first active links 34a, 34b, 34e and 34f merely pivot because there is an axis of easy movement in the X direction, which affects the stationary member 20. Absent. In addition, when the movable body side member 22 moves in the X direction, the second active links 36c, 36d, 36g, 36h swing because they have an axis easy to move in the X direction, but the first active links 34c, 34d, 34g, 34h Since there is an axis of movement in the X direction, the intermediate links 32b and 32d do not move in the X and Y directions. Therefore, the intermediate links 32b and 32d are not affected (not interfered) with respect to the movement of the intermediate links 32a and 32c.

一方、Ｙ方向に配置された駆動コイル４６に直流駆動電流を流すと、駆動磁石４４にはＹ方向への電磁力が作用し、中間リンク３２ｂ，３２ｄをＹ方向へ動かす。中間リンク３２ｂ，３２ｄがＹ方向へ動くと、Ｘ方向に移動困難軸を有する第２能動リンク３６ｃ，３６ｄ，３６ｇ，３６ｈを介して移動体側部材２２及びオートフォーカスユニット１２をＹ方向へ動かす。移動体側部材２２のＹ方向の位置は、Ｙ方向に設けたホール素子５４により検出される。   On the other hand, when a DC drive current is supplied to the drive coil 46 disposed in the Y direction, an electromagnetic force in the Y direction acts on the drive magnet 44 to move the intermediate links 32 b and 32 d in the Y direction. When the intermediate links 32b and 32d move in the Y direction, the movable body side member 22 and the autofocusing unit 12 are moved in the Y direction via the second active links 36c, 36d, 36g and 36h having the hard movement axes in the X direction. The position of the movable body side member 22 in the Y direction is detected by a Hall element 54 provided in the Y direction.

中間リンク３２ｂ，３２ｄがＹ方向へ動くと、第１能動リンク３４ｃ，３４ｄ，３４ｇ，３４ｈはＹ方向に移動容易軸があるので、単に揺動するだけであり、固定体側部材２０に影響を与えない。また、移動体側部材２２がＹ方向へ動くと、第２能動リンク３６ａ，３６ｂ，３６ｅ，３６ｆはＹ方向に移動容易軸があるので揺動するが、第１能動リンク３４ａ，３４ｂ，３４ｅ，３４ｆはＹ方向に移動困難軸があるので、中間リンク３２ａ，３２ｃはＸ方向及びＹ方向共に動かない。したがって、中間リンク３２ｂ，３２ｄの動きに対して中間リンク３２ａ，３２ｃは影響を受けない（干渉されない）。   When the intermediate links 32b and 32d move in the Y direction, the first active links 34c, 34d, 34g and 34h merely pivot because there is an axis of easy movement in the Y direction, which affects the fixed member 20. Absent. In addition, when the movable body side member 22 moves in the Y direction, the second active links 36a, 36b, 36e, 36f swing because they have an axis easy to move in the Y direction, but the first active links 34a, 34b, 34e, 34f Since there is an axis of movement in the Y direction, the intermediate links 32a, 32c do not move in both the X and Y directions. Therefore, the intermediate links 32a and 32c are not affected (not interfered) with respect to the movement of the intermediate links 32b and 32d.

以上のように、移動体側部材２２をＸ方向又はＹ方向へ動かす場合、Ｘ方向又はＹ方向へ直進運動のみの移動をして、Ｙ方向又はＸ方向の移動を阻止するので、移動体側部材２２が回転するのを防止することができる。このため、ホール素子５４は、クロストークや回転振動の検知することが無くなる。   As described above, when moving the movable body side member 22 in the X direction or the Y direction, only the linear movement is moved in the X direction or the Y direction to block the movement in the Y direction or the X direction. Can be prevented from rotating. For this reason, the Hall element 54 does not detect crosstalk or rotational vibration.

この実施形態においては、図３に示すように、ホール素子５４は駆動コイル４６に近接して配置され、実際には駆動コイル４６の巻線内部に配置されている。また、ホール素子５４は駆動磁石４４を兼ねる位置検出用磁石と対向している。駆動コイル４６には、駆動電流の他に所定の交流電流が重畳して流される。この交流電流は、予め定められた固定の周波数と振幅とを有する。駆動電流及びこの交流電流によって駆動コイル４６の周囲には駆動磁界及び交流磁界が生成される。従って、ホール素子５４には、駆動磁石４４を兼ねる位置検出用磁石の磁界、駆動電流による磁界及び所定の交流電流による磁界が作用する。即ち、ホール素子５４からは、位置検出用磁石の磁界による位置信号の他に駆動磁界及び交流磁界による駆動信号及び交流信号が出力される。   In this embodiment, as shown in FIG. 3, the Hall element 54 is disposed close to the drive coil 46 and is actually disposed inside the winding of the drive coil 46. In addition, the Hall element 54 is opposed to the position detection magnet which doubles as the drive magnet 44. In addition to the drive current, a predetermined alternating current is superimposed and flowed to the drive coil 46. This alternating current has a predetermined fixed frequency and amplitude. The drive current and the alternating current generate a drive magnetic field and an alternating magnetic field around the drive coil 46. Therefore, the magnetic field of the position detection magnet which doubles as the drive magnet 44, the magnetic field of the drive current, and the magnetic field of the predetermined alternating current act on the Hall element 54. That is, from the Hall element 54, in addition to the position signal by the magnetic field of the position detection magnet, the drive signal and the AC signal by the drive magnetic field and the AC magnetic field are output.

図４は、ホール素子５４を有する位置検出装置５６の第１実施形態を示すブロック図である。   FIG. 4 is a block diagram showing a first embodiment of a position detection device 56 having a Hall element 54. As shown in FIG.

駆動制御回路５８は、駆動入力信号と交流入力信号とを駆動回路６０に入力する。駆動回路６０は、駆動制御回路５８からの駆動入力信号と交流入力信号とに基づいて駆動電流に所定の交流電流を重畳して駆動コイル４６に流す。駆動電流に交流電流を重畳して駆動コイル４６に流すと、駆動磁界と交流磁界とがホール素子５４に作用する。   The drive control circuit 58 inputs a drive input signal and an alternating current input signal to the drive circuit 60. The drive circuit 60 superimposes a predetermined alternating current on the drive current based on the drive input signal from the drive control circuit 58 and the AC input signal, and causes the drive current to flow. When an alternating current is superimposed on the driving current and supplied to the driving coil 46, the driving magnetic field and the alternating magnetic field act on the Hall element 54.

ホール素子５４は、バイアス電流入力端子Ｈｂとホール電圧出力端子Ｈｏとを有する。ホール素子５４に駆動磁界と交流磁界とが作用すると、ホール電圧端子Ｈｏ間には、駆動磁界に対応した駆動出力電圧と交流磁界に対応した交流出力電圧が生じる。また、位置検出用磁石の磁界に対応した位置出力電圧が生じる。   Hall element 54 has a bias current input terminal Hb and a Hall voltage output terminal Ho. When the drive magnetic field and the AC magnetic field act on the Hall element 54, a drive output voltage corresponding to the drive magnetic field and an AC output voltage corresponding to the AC magnetic field are generated between the Hall voltage terminals Ho. In addition, a position output voltage corresponding to the magnetic field of the position detection magnet is generated.

ホール素子５４の出力側にはオペアンプ６２と抵抗６４とからなる増幅器６６が接続されている。この増幅器６６により、ホール素子５４からの駆動出力電圧と交流出力電圧は増幅され、駆動信号及び交流信号となる。また、位置出力電圧は位置信号となる。   At the output side of the Hall element 54, an amplifier 66 comprising an operational amplifier 62 and a resistor 64 is connected. The drive output voltage and the AC output voltage from the Hall element 54 are amplified by the amplifier 66 to become a drive signal and an AC signal. Also, the position output voltage is a position signal.

増幅器６６の出力側には、帯域通過濾過器（バンドパスフィルタ）６８と低域通過濾過器（ローパスフィルタ）７０とが分かれて接続されている。帯域通過濾過器６８は、予め定められた帯域の周波数を有する信号のみを通過させるもので、ここでは交流信号のみを通過させるようになっている。一方、低域通過濾過器７０は、低域の周波数を有する信号のみを通過させるもので、ここでは、駆動信号及び位置信号のみを通過させるようになっている。   A band pass filter (band pass filter) 68 and a low pass filter (low pass filter) 70 are separately connected to the output side of the amplifier 66. The band pass filter 68 passes only a signal having a predetermined band frequency, and passes only an alternating current signal here. On the other hand, the low pass filter 70 passes only the signal having the low frequency, and passes only the drive signal and the position signal here.

なお、駆動信号や位置信号は、完全な直流ではなく、数百ヘルツの周波数成分を有する場合がある。重畳させる交流電流はこれ（駆動信号や位置信号の周波数）よりも高域側に離間した高周波帯域とする方が確実に分離することができるので好ましい。また、位置検出用磁石を搭載している移動体側部材２２がこの交流電流に追随して移動しないためにも、これよりも高域側に離間した高周波帯域とすることが好ましい。また、駆動信号は位置信号に比べて非常に小さいので、低域通過濾過器７０を通過した駆動信号が位置信号に与える影響は小さく、実質的には位置信号となる。   In addition, a drive signal and a position signal may not have perfect direct current, but may have a frequency component of several hundred hertz. It is preferable to set the AC current to be superimposed as a high frequency band separated to a higher frequency side than this (the frequency of the drive signal or the position signal), because the AC current can be reliably separated. In addition, it is preferable to set the high-frequency band separated higher than this in order to prevent the moving body side member 22 carrying the position detection magnet from moving following the alternating current. Also, since the drive signal is very small compared to the position signal, the influence of the drive signal passed through the low pass filter 70 on the position signal is small, and substantially becomes a position signal.

検波回路７２は、帯域通過濾過器６８から出力された交流信号が入力される。この検波回路７２は、基準電圧が印加され、この基準電圧に基づいて交流信号の振幅に対応した電流値を持つ直流電流に変換する。   The detection circuit 72 receives an AC signal output from the band pass filter 68. The detection circuit 72 is applied with a reference voltage, and converts it to a direct current having a current value corresponding to the amplitude of the alternating current signal based on the reference voltage.

可変利得増幅回路７４は、例えばオペアンプ７６と抵抗７８とを有し、検波回路７２から出力された直流電流の利得を調整して増幅（減幅を含む）させる。この可変利得増幅回路７４で利得が調整された直流電流がホール素子５４のバイアス電流としてフィードバックされる。   The variable gain amplification circuit 74 includes, for example, an operational amplifier 76 and a resistor 78, and adjusts and amplifies (including reduction of) the gain of the DC current output from the detection circuit 72. The direct current whose gain is adjusted by the variable gain amplification circuit 74 is fed back as a bias current of the Hall element 54.

即ち、「ホール素子入力−ホール素子出力−帯域通過濾波器６８−検波回路７２−可変利得増幅回路７４−ホール素子入力」の閉ループを構成し、検波回路７２に入力される交流信号の振幅を基準電圧に基づいて一定に保つように可変利得増幅回路７４によって増減し、ホール素子５４に供給されるバイアス電流値を増減させる。   That is, a closed loop of “Hall element input-Hall element output-Bandpass filter 68-Detection circuit 72-Variable gain amplification circuit 74-Hall element input” is formed, and the amplitude of the AC signal input to the detection circuit 72 is used as a reference. The voltage is increased or decreased by the variable gain amplification circuit 74 so as to be constant based on the voltage, and the value of the bias current supplied to the Hall element 54 is increased or decreased.

上記構成において、移動体側部材２２を移動させたり、移動体側部材２２の移動を修正したりするために、駆動コイル４６は通電量が増減もしくは断続されて発熱や放熱を繰り返し、駆動コイル４６の近傍は局所的な昇降温が生じる。このため、ホール素子５４が温度変動し、対磁界感度が変化しようとする。   In the above configuration, in order to move the moving body side member 22 or to correct the movement of the moving body side member 22, the amount of energization of the drive coil 46 is increased or decreased or interrupted to repeat heat generation and heat release. Local temperature rise occurs. Thus, the temperature of the Hall element 54 fluctuates, and the sensitivity to the magnetic field tends to change.

しかしながら、前述したように、交流信号が一定となるように、ホール素子５４のバイアス電流にフィードバックして自動利得制御がなされるので、印加される固定値である交流磁界に対するホール素子５４の対磁界感度が一定に維持されるとともに、駆動磁石４４（位置検出用磁石）の移動に対する対磁界感度も一定に維持される。   However, as described above, since the automatic gain control is performed by feedback to the bias current of the Hall element 54 so that the AC signal becomes constant, the pair magnetic field of the Hall element 54 with respect to the AC magnetic field which is the fixed value applied. While the sensitivity is kept constant, the paired magnetic field sensitivity to the movement of the drive magnet 44 (position detection magnet) is also kept constant.

即ち、ホール素子５４の感度が低下した場合には、バイアス電流が増加されて検出感度が上げられて一定に維持される。一方、ホール素子５４の感度が増大した場合には、バイアス電流が抑制されて検出感度が下げられて一定に維持される。その結果、ホール素子５４の感度の増減に伴う駆動コイル４６−駆動磁石４４間の相対的移動量の過不足が補われ、正確な位置に移動させることができる。   That is, when the sensitivity of the Hall element 54 is lowered, the bias current is increased, the detection sensitivity is raised and kept constant. On the other hand, when the sensitivity of the Hall element 54 is increased, the bias current is suppressed, the detection sensitivity is lowered and maintained constant. As a result, the relative movement amount between the drive coil 46 and the drive magnet 44 due to the increase or decrease of the sensitivity of the Hall element 54 is compensated, and the movement can be made to the correct position.

図５は、ホール素子５４を有する位置検出装置５６の第２実施形態を示すブロック図である。   FIG. 5 is a block diagram showing a second embodiment of the position detection device 56 having the Hall element 54. As shown in FIG.

この第２実施形態においては、ホール素子５４に印加されるバイアス電流又はバイアス電圧は、例えばオペアンプ８０及び抵抗８２により、一定に保たれるようになっている。また、可変利得増幅回路７４は、ホール素子５４の出力側に接続されている。   In the second embodiment, the bias current or bias voltage applied to the Hall element 54 is kept constant by, for example, the operational amplifier 80 and the resistor 82. Further, the variable gain amplification circuit 74 is connected to the output side of the Hall element 54.

可変利得増幅回路７４から出力された位置信号、駆動信号と交流信号とは、前述した第１実施形態と同様に、帯域通過濾過器６８と低域通過濾過器７０によって分かれて通過するようにしてある。また、帯域通過濾過器６８を通過した交流信号は検波回路７２を介して可変利得増幅回路７４にフィードバックされる。可変利得増幅回路７４は、フィードバックされた交流信号に基づいて交流出力信号が一定となるように利得を調整する。また、位置信号と駆動信号は低域通過濾過器７０を通過し、同様に実質的に位置信号となる。   The position signal, the drive signal, and the AC signal output from the variable gain amplification circuit 74 are separated and passed by the band pass filter 68 and the low pass filter 70 as in the first embodiment described above. is there. Also, the AC signal that has passed through the band pass filter 68 is fed back to the variable gain amplification circuit 74 via the detection circuit 72. The variable gain amplification circuit 74 adjusts the gain so that the AC output signal becomes constant based on the feedback AC signal. Also, the position signal and the drive signal pass through the low pass filter 70 and likewise become substantially a position signal.

なお、第２実施形態において、第１実施形態と同一部分については、図５に同一の番号を付して説明を省略する。   In the second embodiment, the same reference numerals as in the first embodiment denote the same parts in the first embodiment, and a description thereof will be omitted.

なお、この明細書では、カメラ装置１０に用いられる位置検出装置５６について説明したが、本発明は、他の装置にも適用することができる。例えば上述した位置検出装置５６と駆動機構１８と、を備えた駆動装置１４に適用することができる。このような駆動装置１４を備えたカメラ装置１０は手振れ補正をすることができる。その上、温度特性が良く、小型化を図ることができる。
また、駆動磁石４４が位置検出用磁石を兼ねていたが、別々に設けても良い。また、オートフォーカスユニット１２の内部に位置検出装置５６を適用しても良い。その場合、駆動磁石４４と、駆動磁石４４に対向する駆動コイル４６と、駆動磁石４４又は駆動コイル４６が固定され、レンズを支持するレンズ支持体と、を有するレンズ駆動装置である。このレンズ駆動装置は、駆動コイル４６と共に位置検出用磁石に対して移動するホール素子５４と、駆動電流に重畳して所定の交流電流を駆動コイル４６に供給する電流供給手段と、所定の交流電流に対応するホール素子５４の交流信号を一定になるよう制御する制御手段と、を有する。このレンズ駆動装置はレンズ支持体の光軸方向の位置を正確に素早く調整することができる。その上、温度特性が良く、小型化を図ることができる。
また、カメラ装置１０以外、例えば光が反射、屈折、透過等通過する光学素子を備えた光学装置に適用できる。さらに本発明は、携帯電話やスマートフォン等の電子機器に適用できる。 In this specification, although the position detection device 56 used for the camera device 10 has been described, the present invention can be applied to other devices. For example, the present invention can be applied to the drive device 14 provided with the position detection device 56 and the drive mechanism 18 described above. The camera device 10 provided with such a drive device 14 can perform shake correction. In addition, the temperature characteristics are good, and miniaturization can be achieved.
Further, although the drive magnet 44 doubles as the position detection magnet, it may be provided separately. Further, the position detection device 56 may be applied to the inside of the autofocus unit 12. In this case, it is a lens drive device having a drive magnet 44, a drive coil 46 facing the drive magnet 44, and a lens support to which the drive magnet 44 or the drive coil 46 is fixed and which supports the lens. The lens drive device comprises a Hall element 54 which moves relative to the position detection magnet together with the drive coil 46, a current supply means for supplying a predetermined alternating current to the drive coil 46 superimposed on the drive current, and a predetermined alternating current And control means for controlling the alternating current signal of the Hall element 54 corresponding to to be constant. This lens drive can accurately and quickly adjust the position of the lens support in the optical axis direction. In addition, the temperature characteristics are good, and miniaturization can be achieved.
Further, the present invention can be applied to an optical device provided with an optical element other than the camera device 10, for example, through which light is reflected, refracted, transmitted, or the like. Furthermore, the present invention can be applied to electronic devices such as mobile phones and smart phones.

１０ カメラ装置
１２ オートフォーカスユニット
２０ 固定体側部材
２２ 移動体側部材
４４ 駆動磁石（位置検出用磁石）
４６ 駆動コイル
５４ ホール素子
５６ 位置検出装置
６８ 帯域通過濾過器
７０ 低域通過濾過器
７２ 検波回路
７４ 可変利得増幅器

DESCRIPTION OF SYMBOLS 10 Camera apparatus 12 Auto-focusing unit 20 Fixed-body-side member 22 Moving-body-side member 44 Drive magnet (position detection magnet)
46 drive coil 54 hall element 56 position detection device 68 band pass filter 70 low pass filter 72 detection circuit 74 variable gain amplifier

Claims (10)

駆動コイルと共に位置検出用磁石に対して移動するホール素子と、
駆動電流に重畳して所定の交流電流を前記駆動コイルに供給する電流供給手段と、
前記所定の交流電流に対応する前記ホール素子の交流信号の出力を一定になるよう制御する制御手段と、
を有する位置検出装置。 A Hall element that moves relative to the position detection magnet together with the drive coil;
Current supply means for supplying a predetermined alternating current to the drive coil superimposed on the drive current;
Control means for controlling the output of the AC signal of the Hall element corresponding to the predetermined AC current to be constant;
Position detection device having 前記制御手段は、前記ホール素子の交流信号の出力を基に前記ホール素子に供給するバイアス電流を制御する請求項１記載の位置検出装置。   The position detection device according to claim 1, wherein the control unit controls a bias current supplied to the Hall element based on an output of an AC signal of the Hall element. 前記制御手段は、前記ホール素子の交流信号の出力を基に前記ホール素子から出力される出力電圧を制御する請求項１記載の位置検出装置。   The position detection device according to claim 1, wherein the control unit controls an output voltage output from the Hall element based on an output of an AC signal of the Hall element. 前記制御手段は、前記ホール素子の信号出力から前記交流信号の出力を分離し、分離された前記交流信号の出力をフィードバックする請求項１から３いずれか記載の位置検出装置。   The position detection device according to any one of claims 1 to 3, wherein the control means separates the output of the alternating current signal from the signal output of the Hall element and feeds back the separated output of the alternating current signal. 前記制御手段は、帯域通過濾波器、検波回路及び可変利得増幅回路を備え、前記ホール素子の出力は前記帯域通過濾波器を通して前記ホール素子の交流信号の出力として前記検波回路に入力され、前記検波回路の出力が前記可変利得増幅回路を通してフィードバックされる請求項４記載の位置検出装置。   The control means includes a band pass filter, a detection circuit, and a variable gain amplifier circuit, and an output of the Hall element is input to the detection circuit as an output of an AC signal of the Hall element through the band pass filter, the detection 5. The position detection device according to claim 4, wherein an output of a circuit is fed back through the variable gain amplification circuit. 駆動磁石と、
前記駆動磁石に対向する駆動コイルと、
前記駆動コイルと共に位置検出用磁石に対して移動するホール素子と、
駆動電流に重畳して所定の交流電流を前記駆動コイルに供給する電流供給手段と、
前記所定の交流電流に対応する前記ホール素子の交流信号の出力を一定になるよう制御する制御手段と、
を有する駆動装置。 Drive magnet,
A drive coil facing the drive magnet;
A Hall element which moves relative to a position detection magnet together with the drive coil;
Current supply means for supplying a predetermined alternating current to the drive coil superimposed on the drive current;
Control means for controlling the output of the AC signal of the Hall element corresponding to the predetermined AC current to be constant;
A drive unit having a. 駆動磁石と、
前記駆動磁石に対向する駆動コイルと、
前記駆動磁石又は前記駆動コイルが固定され、レンズを支持するレンズ支持体と、
前記駆動コイルと共に位置検出用磁石に対して移動するホール素子と、
駆動電流に重畳して所定の交流電流を前記駆動コイルに供給する電流供給手段と、
前記所定の交流電流に対応する前記ホール素子の交流信号の出力を一定になるよう制御する制御手段と、
を有するレンズ駆動装置。 Drive magnet,
A drive coil facing the drive magnet;
A lens support on which the drive magnet or the drive coil is fixed and which supports a lens;
A Hall element which moves relative to a position detection magnet together with the drive coil;
Current supply means for supplying a predetermined alternating current to the drive coil superimposed on the drive current;
Control means for controlling the output of the AC signal of the Hall element corresponding to the predetermined AC current to be constant;
A lens driving device having 駆動磁石と、
前記駆動磁石に対向する駆動コイルと、
前記駆動磁石又は前記駆動コイルが固定され、光学素子を支持する光学素子支持体と、
前記駆動コイルと共に位置検出用磁石に対して移動するホール素子と、
駆動電流に重畳して所定の交流電流を前記駆動コイルに供給する電流供給手段と、
前記所定の交流電流に対応する前記ホール素子の交流信号の出力を一定になるよう制御する制御手段と、
を有する光学装置。 Drive magnet,
A drive coil facing the drive magnet;
An optical element support on which the drive magnet or the drive coil is fixed and which supports an optical element;
A Hall element which moves relative to a position detection magnet together with the drive coil;
Current supply means for supplying a predetermined alternating current to the drive coil superimposed on the drive current;
Control means for controlling the output of the AC signal of the Hall element corresponding to the predetermined AC current to be constant;
An optical device having 請求項７記載のレンズ駆動装置を備えたカメラ装置。 The camera apparatus provided with the lens drive device of Claim 7. 請求項９記載のカメラ装置を備えた電子機器。
An electronic apparatus comprising the camera apparatus according to claim 9.
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