JP5575389B2

JP5575389B2 - Disc rotation motor

Info

Publication number: JP5575389B2
Application number: JP2008315367A
Authority: JP
Inventors: 俊之西方
Original assignee: Minebea Co Ltd
Current assignee: Minebea Co Ltd
Priority date: 2008-12-11
Filing date: 2008-12-11
Publication date: 2014-08-20
Anticipated expiration: 2028-12-11
Also published as: JP2010142011A

Description

本発明は主として、ＣＤ、ＤＶＤといった光メディアに楽曲や映像の情報を記録したり、その記録情報を再生したりするディスク駆動装置に関するものであり、詳しくはディスク回転用ブラシレスモータの構造に関するものである。 The present invention mainly relates to a disk drive device for recording music and video information on an optical medium such as a CD and a DVD, and reproducing the recorded information, and more particularly to the structure of a brushless motor for rotating a disk. is there.

ＣＤやＤＶＤといった光メディアに楽曲や映像の情報を記録したり、その記録情報を再生したりするディスク駆動装置は、近年、小型、薄型化への要求が厳しくなっている。これに伴い、軸受長さを確保するため、ロータ部中央に凹部を設け、その中に軸受部を収納するとともに、ロータ部の抜け防止機構を構成させる構造が提案されてきた。（例えば特許文献１参照）
図７に上記特許文献１に開示された従来の技術によるディスク回転用モータの断面図を示す。 In recent years, disk drive devices that record music and video information on optical media such as CDs and DVDs and reproduce the recorded information have been demanded to be small and thin. Accordingly, in order to secure the bearing length, a structure has been proposed in which a concave portion is provided in the center of the rotor portion, the bearing portion is accommodated therein, and a mechanism for preventing the rotor portion from coming off is configured. (For example, see Patent Document 1)
FIG. 7 shows a cross-sectional view of a conventional disk rotation motor disclosed in Patent Document 1 described above.

図７において、ディスク回転用モータはロータ部１０１とステータ部１０２によって構成され、ロータ部１０１のターンテーブル部１０３の内側開口部には切削加工等によって係合部１０４が形成され、軸受ホルダー１０５に固定された抜け止め部材１０６に形成された被係合部１０７と軸方向に係合することによってロータ抜け防止機構が構成されている。 In FIG. 7, the disk rotation motor is composed of a rotor part 101 and a stator part 102, and an engagement part 104 is formed in the inner opening of the turntable part 103 of the rotor part 101 by cutting or the like. A rotor removal prevention mechanism is configured by engaging in the axial direction with an engaged portion 107 formed on the fixed retaining member 106.

また、上記従来技術とは別に、ロータ部を吸引するマグネットのヨ−クを利用してロータ抜け防止機構を構成する構造も提案されている。（例えば特許文献２参照）
図８に上記特許文献２に開示された従来の技術によるディスク回転用モータの断面図を示す。 In addition to the above prior art, a structure that constitutes a rotor removal prevention mechanism using a yoke of a magnet that attracts the rotor portion has also been proposed. (For example, see Patent Document 2)
FIG. 8 shows a cross-sectional view of a conventional disk rotating motor disclosed in Patent Document 2.

図８において、ディスク回転用モータはロータ部１０８とステータ部１０９によって構成されている。ロータ部１０８のターンテーブル部１１０には抜け止め部材１１１が溶接により固定され、この抜け止め部材１１１が軸受ホルダー１１２に固定されたロータ部吸引マグネット１１３のヨ−ク１１４外周部と軸方向に係合することによってロータ抜け防止機構が構成されている。 In FIG. 8, the disk rotation motor is composed of a rotor portion 108 and a stator portion 109. A retaining member 111 is fixed to the turntable portion 110 of the rotor portion 108 by welding, and the retaining member 111 is axially engaged with the outer periphery of the yoke 114 of the rotor portion attracting magnet 113 fixed to the bearing holder 112. By combining them, a rotor removal prevention mechanism is configured.

また、ディスク駆動装置は低コスト化への要求も非常に厳しくなっているが、プレス加工によって係合部をロータ部のターンテーブル部に一体に形成された構造も提案されている。（例えば、特許文献３参照）
図９に上記特許文献３に開示された従来技術によるディスク回転用モータの断面図を示す。 Further, the demand for cost reduction of the disk drive device has become very strict, but a structure in which the engaging portion is integrally formed with the turntable portion of the rotor portion by pressing is also proposed. (For example, see Patent Document 3)
FIG. 9 shows a cross-sectional view of a conventional disk rotating motor disclosed in Patent Document 3.

図９においてディスク回転用モータは、ロータ部１１５とステータ部１１６によって構成されている。ロータ部１１５のターンテーブル部１１７にはロータ抜け防止の係合部１１８が一体に形成されている。ステータ部１１６の軸受ホルダーであるメタルハウジング１１９には螺旋構造１２０が形成されている。ロータ部１１５をステータ部１１６に組み付ける時には、ターンテーブル部１１７を回転させて係合部１１８を螺旋構造１２０に螺号しながら挿入する。係合部１１８が螺旋構造１２０から通過した後は、係合部１１８と螺旋構造１２０が軸方向に係合するロータ抜け防止機構が構成される。そして、係合部１１８を螺旋構造１２０に螺号しながら挿入時とは逆方向にターンテーブル部１１７を回転させることにより、螺旋構造１２０から係合部１１８を通過させてロータ部１１５をステータ部１１６から取り外すことができる。これにより、ステータ部１１６からロータ部の
１１５挿抜が容易なロータ抜け防止機構が構成できるものである。 In FIG. 9, the disk rotation motor includes a rotor part 115 and a stator part 116. The turntable portion 117 of the rotor portion 115 is integrally formed with an engagement portion 118 for preventing the rotor from coming off. A spiral structure 120 is formed in a metal housing 119 that is a bearing holder of the stator portion 116. When the rotor part 115 is assembled to the stator part 116, the turntable part 117 is rotated and the engaging part 118 is inserted into the helical structure 120 while being screwed. After the engagement portion 118 passes from the spiral structure 120, a rotor removal prevention mechanism is formed in which the engagement portion 118 and the spiral structure 120 are engaged in the axial direction. Then, by rotating the turntable portion 117 in the direction opposite to that during insertion while screwing the engaging portion 118 into the helical structure 120, the rotor portion 115 is passed through the engaging portion 118 from the helical structure 120 and the stator portion 116. Can be removed from. Thereby, a rotor removal prevention mechanism in which the rotor portion 115 can be easily inserted into and removed from the stator portion 116 can be configured.

そして、ディスク駆動用モータの構造をさらに簡素化するため、ターンテーブル部１１７の係合部１１８を塑性変形によって折り曲げ、メタルハウジング１１９の被係合部と係合する構造も提案されている。（例えば、特許文献４参照）
特開２００２−１７６７４２号公報特開２００５−３５４７５７号公報特開２００６−３２５３３３号公報特開２００８−１２３５７５号公報 In order to further simplify the structure of the disk drive motor, a structure in which the engaging portion 118 of the turntable 117 is bent by plastic deformation and engaged with the engaged portion of the metal housing 119 has been proposed. (For example, see Patent Document 4)
JP 2002-176742 A JP 2005-354757 A JP 2006-325333 A JP 2008-123575 A

近年、ディスク駆動装置に用いられるディスク回転用モータは、小型化、薄型化、低コスト化が厳しく要求され、さらに数千時間におよぶ長寿命性能、および数万回といったディスクの繰り返し脱着に対する信頼性も要求されている。 In recent years, disk rotation motors used in disk drive devices have been required to be small, thin, and low in cost, and have a long life performance of several thousand hours, and reliability against repeated insertion and removal of disks of several tens of thousands of times. Is also required.

図７に示す抜け防止機構は、ロータ部中央の凹部内に軸受、および抜け止め構造を構成することによって、小型、薄型化しやすいという利点を持つ。しかしながら、被係合部１０７が形成された弾性部材からなる抜け止め部材１０６は、軸受ホルダー１０５に圧入または接着等により固定されているため、数万回というディスク繰り返し脱着に対しての耐久性を考えると好ましくない。また、弾性変形可能な材質および形状を設定する必要があり、材料費も一般の鋼板に比べると高価になる。 The drop prevention mechanism shown in FIG. 7 has an advantage that it is easy to reduce the size and thickness by forming a bearing and a drop prevention structure in the recess in the center of the rotor portion. However, since the retaining member 106 made of an elastic member in which the engaged portion 107 is formed is fixed to the bearing holder 105 by press-fitting or bonding, the durability against repeated detachment of the disk several tens of thousands of times. This is not preferable. Moreover, it is necessary to set the material and shape which can be elastically deformed, and the material cost is higher than that of a general steel plate.

そして、図８に示す抜け防止機構では、抜け止め部材１１１はターンテーブル部１１０に溶接により固定されている。防止機構の係合部を弾性変形させて係合させる際、抜け止め部材１１１をターンテーブル部１１０から剥離する方向にモ−メントが発生するため、図７に示す抜け防止機構と同様に、数万回というディスク繰り返し脱着に対しての耐久性を考えると好ましくない。 In the drop prevention mechanism shown in FIG. 8, the stopper member 111 is fixed to the turntable portion 110 by welding. When the engagement portion of the prevention mechanism is elastically deformed and engaged, a moment is generated in a direction in which the retaining member 111 is peeled off from the turntable portion 110. Therefore, as in the case of the removal prevention mechanism shown in FIG. Considering durability against repeated disk insertion / removal of 10,000 times, it is not preferable.

また、図７に示す抜け止め構造同様、弾性変形可能な材質および形状を設定する必要があり、材料費も一般の鋼板に比べると高価になる。 Further, like the retaining structure shown in FIG. 7, it is necessary to set a material and a shape that can be elastically deformed, and the material cost is higher than that of a general steel plate.

これに対し、図９に示す抜け止め機構は、抜け止めの係合部１１８はターンテーブル部１１７に、被係合部はメタルハウジング１１９にそれぞれプレス加工によって一体に成形されているため、コスト面で有利になることに加え、一体であるため剛性も高く、耐久性にも優れている。しかしながら、抜け止め構造がターンテーブル部１１７よりも軸方向下側で構成されるため、薄型化の際の軸受長さ確保という点では不利となる。 On the other hand, the retaining mechanism shown in FIG. 9 is formed integrally with the turntable portion 117 by the press-engagement engaging portion 118 and the metal housing 119 by the press working. In addition to being advantageous, since it is integrated, it has high rigidity and excellent durability. However, since the retaining structure is configured on the lower side in the axial direction than the turntable portion 117, it is disadvantageous in terms of securing the bearing length when the thickness is reduced.

上記課題を解決するために本発明は、ディスクを搭載するターンテーブル部が一体に形成されたロータフレームとディスクを芯出し支持するディスク調芯部材と前記ロータフレームに取り付けられたロータマグネットと前記ロータフレームの中央に固定されたシャフトとを有するロータ部と、前記シャフトを支承する軸受とこの軸受を保持するメタルハウジングと前記ロータマグネットと対向して配置され巻線が施されたコアと前記メタルハウジングを保持するブラケットとを備えるステータ部とからなるディスク回転用モータにおいて、前記ロータフレームの内側開口部の中央に前記軸受を収納する凹部が形成され、この凹部内には複数の係合部が前記ロータフレームから一体に径方向内側に突出して形成され、この係合部の軸方向上面部には前記ロータフレームの係合部に対応する位置の少なくとも１箇所に遮蔽片を形成した略円環形状の遮蔽部材が設置され、さらに、前記メタルハウジングの軸方向上側端面には、前記ロータフレームの係合部と同数の切欠部を形成した被係合部が径方向外側に向かって一体的に形成され、前記ロータフレームの係合部、および前記遮蔽部材の遮蔽片に内接する円の直径寸法は前記メタルハウジングの被係合部の外形寸法より小さく設定され、前記切欠部を含み軸に直行する平面への前記係合部および前記遮蔽片の射影が前記切欠部の範囲内に収まるように構成して、前記係合部と前記遮蔽片の周方向の位相を合わせた状態で前記切欠部を軸方向に通過可能に形成し、前記ロータ部を前記ステータ部に組込んだ状態では、前記係合部と前記切欠部との軸方向の間に前記遮蔽部材が位置するように構成し、前記ロータフレームの係合部と前記遮蔽部材の遮蔽片を周方向に位相をずらすことによって、前記係合部の射影が前記切欠部の範囲内に収まった状態における前記係合部の射影と前記切欠部との周方向の隙間を、前記遮蔽部材の遮蔽片で覆い、メタルハウジングの被係合部の切欠部に、ロータフレームの係合部を通過させ、次にメタルハウジングの切欠部に遮蔽部材の遮蔽片を通過させることで構成することでロータ部が容易に抜けない構造とした。 In order to solve the above problems, the present invention provides a rotor frame integrally formed with a turntable portion on which a disk is mounted, a disk alignment member for centering and supporting the disk, a rotor magnet attached to the rotor frame, and the rotor A rotor portion having a shaft fixed at the center of the frame; a bearing for supporting the shaft; a metal housing for holding the bearing; a core disposed opposite to the rotor magnet and provided with winding; and the metal housing In the disk rotation motor comprising a stator portion including a bracket for holding a recess, a recess for housing the bearing is formed in the center of the inner opening of the rotor frame, and a plurality of engagement portions are provided in the recess. An upper surface in the axial direction of this engaging portion that is formed to project radially inward from the rotor frame. Is provided with a substantially annular shielding member formed with a shielding piece at at least one position corresponding to the engaging portion of the rotor frame, and on the upper end surface in the axial direction of the metal housing, Engaged portions having the same number of notch portions as the engaging portions are integrally formed radially outward, and the diameter dimension of a circle inscribed in the engaging portion of the rotor frame and the shielding piece of the shielding member Is set to be smaller than the outer dimension of the engaged portion of the metal housing so that the projection of the engaging portion and the shielding piece on the plane including the notch and perpendicular to the shaft is within the range of the notch. In the state where the engaging portion and the shielding piece are aligned in the circumferential direction, the notch portion is formed to be able to pass in the axial direction, and the rotor portion is incorporated in the stator portion, Engagement part and the cut The shielding member is positioned between the axial direction of the portion and the engaging portion of the rotor frame and the shielding piece of the shielding member are shifted in the circumferential direction, thereby projecting the engaging portion. the circumferential clearance between the engaging portion projected and the notch in a state where the falls within the range of the notch, not covered by the shielding piece of the shielding member, the notch of the engagement portion of the metal housing The rotor part is not easily removed by passing through the engaging part of the rotor frame and then passing the shielding piece of the shielding member through the notch part of the metal housing .

本発明によれば、ロータ部とステータ部にそれぞれ形成された抜け止めの係合部、被係合部は、ロータフレーム、およびメタルハウジングにプレス加工によって一体に成形されているため、コスト面で有利になることに加え、一体であるため剛性も高く、耐久性にも優れている。また、ロータフレーム中央の凹形状内に抜け止め構造を構成するため薄型化に有利であることに加え、ロータ部の組込は係合部と被係合部の切欠部との周方向の位相合わせによるため、抜け止め構造に対するストレスはなく、信頼性の高いモータを構成できる。また、遮蔽部材は係合部が被係合部の切欠部の中に収まった場合に、両者の周方向隙間を埋めるだけの機能があればよいため、比較的剛性の低い材料でも可能であるし、ばね性も必要とされないために、非常に安価な材料を使用した抜け止め構造を構成することが可能となる。 According to the present invention, the retaining engagement portion and the engaged portion respectively formed on the rotor portion and the stator portion are integrally formed by pressing on the rotor frame and the metal housing. In addition to being advantageous, since it is integrated, it has high rigidity and excellent durability. In addition, since the retaining structure is formed in the concave shape in the center of the rotor frame, it is advantageous for thinning, and the rotor portion is incorporated in the circumferential phase between the engaging portion and the notched portion of the engaged portion. Due to the matching, there is no stress on the retaining structure, and a highly reliable motor can be configured. In addition, since the shielding member only needs to have a function of filling the circumferential gap between the engaging portions when the engaging portions are accommodated in the cutout portions of the engaged portions, a material with relatively low rigidity is possible. In addition, since the spring property is not required, it is possible to configure a retaining structure using a very inexpensive material.

以下、本発明の実施の形態について図面を参照しながら説明する。 Hereinafter, embodiments of the present invention will be described with reference to the drawings.

（実施の形態）
図１は本発明の実施の形態に係るディスク回転用モータの構造断面図、図２（ａ）は本発明の実施の形態に係るディスク回転用モータのロータ部下側矢視図、図２（ｂ）は本発明の実施の形態に係るディスク回転用モータの遮蔽部材の平面図、図３は本発明の実施の形態に係るディスク回転用モータのステータ部上側矢視図である。 (Embodiment)
FIG. 1 is a structural sectional view of a disk rotation motor according to an embodiment of the present invention, FIG. 2A is a lower side view of a rotor portion of the disk rotation motor according to the embodiment of the present invention, and FIG. ) Is a plan view of the shielding member of the disk rotation motor according to the embodiment of the present invention, and FIG. 3 is a top view of the stator portion of the disk rotation motor according to the embodiment of the present invention.

図１においてディスク回転用モータは、ディスクを搭載するターンテーブル部１が一体に形成されたロータフレーム２と、ディスクを芯出し支持するディスク調芯部材３と、ロータフレーム２に取り付けられたロータマグネット４と、ロータフレーム２の中央に固定されたシャフト５とを有するロータ部６と、シャフト５を支承する軸受７と、この軸受７を保持するメタルハウジング８と、ロータマグネット４と対向して配置され巻線９が施されたコア１０と、メタルハウジング８を保持するブラケット１１とを備えるステータ部１２とにより構成される。 In FIG. 1, a disk rotation motor includes a rotor frame 2 integrally formed with a turntable portion 1 on which a disk is mounted, a disk alignment member 3 for centering and supporting the disk, and a rotor magnet attached to the rotor frame 2. 4, a rotor portion 6 having a shaft 5 fixed to the center of the rotor frame 2, a bearing 7 that supports the shaft 5, a metal housing 8 that holds the bearing 7, and a rotor magnet 4. The stator 10 includes a core 10 provided with a winding 9 and a bracket 11 that holds the metal housing 8.

ロータ部６は図２（ａ）に示すように、ロータフレーム２の内側開口部の中央部に凹部１３が形成されている。そして、凹部１３には、図１に示すように軸受７および軸受７を保持するメタルハウジング８を収納している。また、凹部１３内には、ロータ抜け防止の係合部として機能する複数箇所の係合部１４が、ロータフレーム２から一体に径方向内側に突出して形成されている。また、この係合部１４の軸方向上面部にはロータフレーム２の係合部１４に対応する位置に、係合部１４と略同形状の遮蔽片１５が設置されている。図２（ｂ）に示すように、遮蔽片１５は円環部１６ａにより連結されて遮蔽部材１６を形成している。そして遮蔽部材１６は、ディスク調芯部材３に形成された押圧ばね部１７によって円環部１６ａをロータフレーム２の外側天面に軸方向に圧接固定され、さらにディスク調芯部材３に形成された支柱形状部１８によってロータフレームに対する回転移動を
防止されている。 As shown in FIG. 2A, the rotor portion 6 has a recess 13 formed at the center of the inner opening of the rotor frame 2. The recess 13 houses the bearing 7 and the metal housing 8 that holds the bearing 7 as shown in FIG. In the recess 13, a plurality of engaging portions 14 functioning as engaging portions for preventing the rotor from coming off are formed so as to protrude radially inward from the rotor frame 2. Further, a shielding piece 15 having substantially the same shape as the engaging portion 14 is installed on the upper surface in the axial direction of the engaging portion 14 at a position corresponding to the engaging portion 14 of the rotor frame 2. As shown in FIG. 2B, the shielding pieces 15 are connected by an annular portion 16 a to form a shielding member 16. The shielding member 16 is formed by pressing the annular portion 16a in the axial direction on the outer top surface of the rotor frame 2 by the pressing spring portion 17 formed on the disc alignment member 3, and further formed on the disc alignment member 3. The columnar shape portion 18 prevents rotational movement relative to the rotor frame.

また、図３に示すように、ステータ部１２のメタルハウジング８の軸方向上側端面には、ロータフレーム２の係合部１４と同数の切欠部１９を形成した被係合部２０が径方向外側に向かって一体的に形成されている。 Further, as shown in FIG. 3, an engaged portion 20 in which the same number of notch portions 19 as the engaging portions 14 of the rotor frame 2 are formed on the axially upper end surface of the metal housing 8 of the stator portion 12 is radially outward. Are integrally formed.

そしてロータフレーム２の係合部１４、および遮蔽部材１６の遮蔽片１５に内接する円の直径寸法は、メタルハウジング８の被係合部２０の外径寸法より小さく設定されている。 The diameter of the circle inscribed in the engaging portion 14 of the rotor frame 2 and the shielding piece 15 of the shielding member 16 is set smaller than the outer diameter of the engaged portion 20 of the metal housing 8.

さらに、メタルハウジング８の切欠部１９は、ロータフレーム２の係合部１４および遮蔽部材１６の遮蔽片１５が軸方向に挿通可能な大きさ及び形状に形成されている。即ち、切欠部１９を含み軸に直行する平面へのロータフレーム２の係合部１４および遮蔽部材１６の遮蔽片１５の射影が、切欠部１９の範囲内に収まる様に形成されている。 Further, the cutout portion 19 of the metal housing 8 is formed in a size and shape that allows the engagement portion 14 of the rotor frame 2 and the shielding piece 15 of the shielding member 16 to be inserted in the axial direction. That is, the projection of the engaging portion 14 of the rotor frame 2 and the shielding piece 15 of the shielding member 16 onto the plane including the notch 19 and perpendicular to the axis is formed so as to be within the range of the notch 19.

図４（ａ）〜（ｆ）は本発明の実施の形態に係る抜け止め係合過程の概略を示す斜視図である。また、図５（ａ）〜（ｅ）は、それぞれ図４（ａ）〜（ｆ）に示す状態の要部横断面図である。 4 (a) to 4 (f) are perspective views showing an outline of a retaining engagement process according to the embodiment of the present invention. FIGS. 5A to 5E are cross-sectional views of main parts in the states shown in FIGS. 4A to 4F, respectively.

図４（ａ）に示すように、ロータ部６をステータ部１２に挿入する際には、メタルハウジング８の切欠部１９を含み軸に直行する平面へのロータフレーム２の係合部１４の射影が、図５（ａ）に斜線で示す切欠部１９の範囲内に収まる様に周方向の位置を合わせて、係合部１４を軸方向に挿通させることによって、係合部１４を被係合部２０の軸方向下側に向かって貫通させることができる。この状態では、図５（ｂ）に示すように、切欠部１９と係合部１４の射影の間には周方向の隙間ｗが生じる。次に、図４（ｂ）に示すように、ロータフレーム２の係合部１４がメタルハウジング８の被係合部２０を貫通した後、図５（ｃ）に示すようにメタルハウジング８の切欠部１９を含み軸に直行する平面への遮蔽部材１６の遮蔽片１５の射影が、図５（ａ）に斜線で示す切欠部１９の範囲内に収まる様に周方向の位置を合わせる。この状態で遮蔽片１５を軸方向に挿通させることによって、図４（ｃ）に示すように、遮蔽片１５を被係合部２０の軸方向下側に向かって貫通させることができる。 As shown in FIG. 4A, when the rotor portion 6 is inserted into the stator portion 12, the projection of the engaging portion 14 of the rotor frame 2 onto a plane that includes the notch portion 19 of the metal housing 8 and is orthogonal to the shaft. However, the engagement portion 14 is engaged by inserting the engagement portion 14 in the axial direction by aligning the positions in the circumferential direction so as to be within the range of the notch portion 19 indicated by hatching in FIG. The portion 20 can be penetrated toward the lower side in the axial direction. In this state, as shown in FIG. 5B, a circumferential gap w is generated between the projections of the notch 19 and the engaging portion 14. Next, as shown in FIG. 4B, after the engaging portion 14 of the rotor frame 2 penetrates the engaged portion 20 of the metal housing 8, the notch of the metal housing 8 is cut as shown in FIG. The position in the circumferential direction is adjusted so that the projection of the shielding piece 15 of the shielding member 16 onto the plane including the portion 19 and perpendicular to the axis is within the range of the notch 19 indicated by the oblique lines in FIG. By inserting the shielding piece 15 in the axial direction in this state, the shielding piece 15 can be penetrated toward the lower side in the axial direction of the engaged portion 20 as shown in FIG.

遮蔽部材１６の遮蔽片１５がメタルハウジング８の被係合部２０を貫通した後、図４（ｄ）、図５（ｄ）に示すように、メタルハウジング８の被係合部２０に形成された切欠部１９とロータフレーム２の係合部１４の射影の周方向の隙間ｗを覆う位置まで遮蔽部材１６を周方向に（図中矢印で示す）回転移動させる。その後、図４（ｅ）に示すように、ロータフレーム２にディスク調芯部材３を挿入固定する。図６（ａ）にロータフレーム２にディスク調芯部材３が挿入固定された状態の上側斜視図を示す。図６（ａ）にＰで示す要部の部分拡大図を図６（ｂ）に示す。遮蔽部材１６を周方向に回転移動させることにより、メタルハウジング８の被係合部２０に形成された切欠部１９とロータフレーム２の係合部１４の射影の周方向の隙間ｗの内、回転方向側の隙間ｗが、遮蔽片１５で覆われている。 After the shielding piece 15 of the shielding member 16 penetrates the engaged portion 20 of the metal housing 8, it is formed on the engaged portion 20 of the metal housing 8 as shown in FIGS. 4 (d) and 5 (d). The shielding member 16 is rotationally moved in the circumferential direction (indicated by an arrow in the figure) to a position that covers the circumferential gap w of the projection of the notched portion 19 and the engaging portion 14 of the rotor frame 2. Thereafter, as shown in FIG. 4 (e), the disk alignment member 3 is inserted and fixed to the rotor frame 2. FIG. 6A shows an upper perspective view in a state where the disk aligning member 3 is inserted and fixed to the rotor frame 2. FIG. 6B shows a partially enlarged view of the main part indicated by P in FIG. By rotating and moving the shielding member 16 in the circumferential direction, it rotates within the circumferential gap w of the projection of the notched portion 19 formed in the engaged portion 20 of the metal housing 8 and the engaging portion 14 of the rotor frame 2. The gap w on the direction side is covered with the shielding piece 15.

また、図４（ｅ）に示すように、ディスク調芯部材３には、遮蔽部材１６の遮蔽片１５に対応する位置に、ロータフレーム２の天面に向けて支柱形状部１８が突出して形成されており、ロータフレーム２にディスク調芯部材３を挿入固定する際に、図５（ｅ）に示すように、支柱形状部１８を遮蔽部材１６の遮蔽片１５の周方向の端面に当接させることによって、遮蔽部材１６の遮蔽片１５のロータフレーム２に対する回転移動を抑制し、上記隙間ｗを覆う状態が確実に維持できるように構成されている。さらに、ディスク調芯部材３には、図４（ｅ）に示すように、遮蔽部材１６の円環部１６ａに対応する位置に弾性を
有する押圧ばね部１７が形成されており、この押圧ばね部１７により遮蔽部材１６を円環部１６ａの位置でロータフレーム２の外側天面に軸方向に圧接固定することによって、軸方向のがたつきを抑制するように構成されている。そして、図４（ｂ）、図５（ｂ）に示すように、ロータフレーム２の係合部１４に、軸方向上側に突出して凸部２１を形成し、図５（ｄ）に示すように、この凸部２１に遮蔽部材１６の遮蔽片１５の周方向の端面を当接させることにより、ディスク調芯部材３を挿入するまでの作業工程において、遮蔽部材１６の周方向ずれを抑制し、上記隙間ｗを覆う状態を確実に維持することができる。 Further, as shown in FIG. 4 (e), the columnar alignment member 3 is formed with a pillar-shaped portion 18 projecting toward the top surface of the rotor frame 2 at a position corresponding to the shielding piece 15 of the shielding member 16. When the disk aligning member 3 is inserted into and fixed to the rotor frame 2, as shown in FIG. 5 (e), the columnar shape portion 18 is brought into contact with the circumferential end surface of the shielding piece 15 of the shielding member 16. By doing so, the rotational movement of the shielding member 16 with respect to the rotor frame 2 of the shielding piece 15 is suppressed, and the state of covering the gap w can be reliably maintained. Further, as shown in FIG. 4E, the disk aligning member 3 is formed with a pressing spring portion 17 having elasticity at a position corresponding to the annular portion 16a of the shielding member 16, and this pressing spring portion. 17, the shielding member 16 is configured to be axially pressed and fixed to the outer top surface of the rotor frame 2 at the position of the annular portion 16a, so that shakiness in the axial direction is suppressed. Then, as shown in FIGS. 4B and 5B, the engaging portion 14 of the rotor frame 2 protrudes upward in the axial direction to form a convex portion 21 as shown in FIG. 5D. In the work process until the disc alignment member 3 is inserted by bringing the circumferential end face of the shielding piece 15 of the shielding member 16 into contact with the convex portion 21, the circumferential displacement of the shielding member 16 is suppressed. The state covering the gap w can be reliably maintained.

以上の状態で、ロータ部６を軸方向上側に移動させた場合、ロータフレーム２の係合部１４とメタルハウジング８の被係合部２０が係合してロータ部６の移動を規制するので、抜け防止機構として機能する。仮に被係合部２０の切欠部１９を含み軸に直行する平面への係合部１４の射影が、切欠部１９の範囲内に収まる状態となっても、係合部１４の射影と切欠部１９との隙間を、係合部１４と切欠部１９の間に配設された遮蔽部材１６の遮蔽片１５が塞ぐので、ロータ部６が容易には抜けない構造となる。 In the above state, when the rotor part 6 is moved upward in the axial direction, the engaging part 14 of the rotor frame 2 and the engaged part 20 of the metal housing 8 are engaged to restrict the movement of the rotor part 6. It functions as a drop prevention mechanism. Even if the projection of the engaging portion 14 on the plane including the notched portion 19 of the engaged portion 20 and perpendicular to the axis is within the range of the notched portion 19, the projection of the engaging portion 14 and the notched portion Since the shielding piece 15 of the shielding member 16 disposed between the engaging portion 14 and the notch portion 19 closes the gap between the rotor portion 19 and the rotor portion 6, the rotor portion 6 cannot be easily removed.

本実施の形態においては、遮蔽部材１６の遮蔽片１５は、ロータフレーム２の係合部１４と同数形成されているが、それよりも少数であっても機能を果たすことは可能である。 In the present embodiment, the same number of the shielding pieces 15 of the shielding member 16 as the engaging portions 14 of the rotor frame 2 are formed. However, even if the number is smaller than that, the function can be achieved.

また、遮蔽部材１６のストレス低減や破損防止、またロータ部６の抜け強度の確保を考えた場合、図４（ｄ）に示す、ロータフレーム２の係合部１４の射影が切欠部１９の範囲内に収まる状態における切欠部１９と係合部１４の射影の周方向隙間ｗは可能な限り狭い方が良いが、少なくとも遮蔽部材１６の板厚よりも小さい方が望ましい。 Further, in consideration of stress reduction and prevention of breakage of the shielding member 16 and securing of the removal strength of the rotor portion 6, the projection of the engaging portion 14 of the rotor frame 2 shown in FIG. The projection-direction circumferential gap w between the cutout 19 and the engagement portion 14 in the state of being accommodated inside is preferably as narrow as possible, but is preferably at least smaller than the plate thickness of the shielding member 16.

なお、遮蔽部材１６については、金属製薄肉板でも可能であるし、樹脂成形部材等であってもロータフレーム２の係合部１４とメタルハウジング８の被係合部２０の切欠部１９の周方向隙間ｗを塞ぐことができる材料、および形状であれば代用は可能である。 The shielding member 16 may be a metal thin plate, or may be a resin molded member or the like, and the periphery of the engagement portion 14 of the rotor frame 2 and the cutout portion 19 of the engaged portion 20 of the metal housing 8. Any material and shape that can close the directional gap w can be substituted.

光メディア用スピンドルモータ等、小型化、薄型化に加え、高信頼性や、低コストが求められるモバイル機器用ブラシレスモータに有用である。 It is useful for brushless motors for mobile devices that require high reliability and low cost in addition to miniaturization and thinning, such as optical media spindle motors.

本発明の実施の形態に係るディスク回転用モータの構造断面図Cross-sectional view of the structure of a disk rotation motor according to an embodiment of the present invention （ａ）本発明の実施の形態に係るディスク回転用モータのロータ部下側斜視図、（ｂ）本発明の実施の形態に係るディスク回転用モータの遮蔽部材の平面図(A) The rotor part lower side perspective view of the disk rotation motor which concerns on embodiment of this invention, (b) The top view of the shielding member of the disk rotation motor which concerns on embodiment of this invention 本発明の実施の形態に係るディスク回転用モータのステータ部上側斜視図The stator part upper side perspective view of the disk rotation motor which concerns on embodiment of this invention （ａ）、（ｂ）、（ｃ）、（ｄ）、（ｅ）、（ｆ）本発明の実施の形態に係る抜け止め係合過程概略を示す斜視図(A), (b), (c), (d), (e), (f) A perspective view showing an outline of a retaining engagement process according to an embodiment of the present invention. （ａ）、（ｂ）、（ｃ）、（ｄ）、（ｅ）本発明の実施の形態に係る抜け止め係合過程概略を示す要部横断面図(A), (b), (c), (d), (e) Cross-sectional view of relevant parts showing an outline of a retaining engagement process according to an embodiment of the present invention. （ａ）本発明の実施の形態に係るロータフレーム２にディスク調芯部材３が挿入固定された状態の上側斜視図、（ｂ）要部拡大図(A) Upper side perspective view of a state in which the disk alignment member 3 is inserted and fixed to the rotor frame 2 according to the embodiment of the present invention, (b) an enlarged view of a main part. 第１の従来のディスク回転用モータを示す構造断面図Structural sectional view showing a first conventional disk rotation motor 第２の従来のディスク回転用モータを示す構造断面図Structural sectional view showing a second conventional disk rotation motor 第３の従来のディスク回転用モータを示す構造断面図Structural sectional view showing a third conventional disk rotation motor

Explanation of symbols

１、１０３、１１０、１１７ターンテーブル部
２ロータフレーム
３ディスク調芯部材
４ロータマグネット
５シャフト
６、１０１、１０８、１１５ロータ部
７軸受
８、１１９メタルハウジング
９巻線
１０コア
１１ブラケット
１２、１０２、１０９、１１６ステータ部
１３凹部
１４、１０４、１１８係合部
１５遮蔽片
１６遮蔽部材
１６ａ円環部
１７押圧ばね部
１８支柱形状部
１９切欠部
２０、１０７被係合部
２１凸部
１０５、１１２軸受ホルダー
１０６、１１１抜け止め部材
１１３吸引マグネット
１１４ヨ−ク
１２０螺旋構造 DESCRIPTION OF SYMBOLS 1,103,110,117 Turntable part 2 Rotor frame 3 Disc alignment member 4 Rotor magnet 5 Shaft 6, 101, 108, 115 Rotor part 7 Bearing 8, 119 Metal housing 9 Winding 10 Core 11 Bracket 12, 102, 109, 116 Stator part 13 Concave part 14, 104, 118 Engagement part 15 Shielding piece 16 Shielding member 16a Annular part 17 Pressing spring part 18 Strut shape part 19 Notch part 20, 107 Engagement part 21 Convex part 105, 112 Bearing Holder 106, 111 Retaining member 113 Suction magnet 114 York 120 Helical structure

Claims

A rotor frame integrally formed with a turntable portion for mounting a disk, a disk alignment member for centering and supporting the disk, a rotor magnet attached to the rotor frame, and a shaft fixed to the center of the rotor frame A rotor portion, a bearing that supports the shaft, a metal housing that holds the bearing, a core that is disposed opposite to the rotor magnet and that is wound, and a stator portion that includes a bracket that holds the metal housing. In the disk rotation motor, a recess for housing the bearing is formed at the center of the inner opening of the rotor frame, and a plurality of engaging portions protrude from the rotor frame integrally in the radial direction in the recess. A substantially annular shielding member is installed on the upper surface in the axial direction of the engaging portion. The shielding member is formed by connecting shielding pieces formed at at least one position corresponding to the engaging portion of the rotor frame with an annular ring portion, and further, in the axial direction of the metal housing. On the upper end surface, engaged portions having the same number of notch portions as the engaging portions of the rotor frame are integrally formed radially outward, the engaging portions of the rotor frame, and the shielding members. The diameter dimension of the circle inscribed in the shielding piece is set smaller than the outer dimension of the engaged part of the metal housing, and the projection of the engaging part and the shielding piece on a plane including the notch and perpendicular to the axis is the It is configured so as to be within the range of the notch part, and the notch part is formed so as to be able to pass in the axial direction in a state in which the phase of the engagement part and the shielding piece is in the circumferential direction, and the rotor part is the stator. Built in part Is configured such that the shielding member is positioned between the engagement portion and the cutout portion in the axial direction, and the engagement portion of the rotor frame and the shielding piece of the shielding member are shifted in the circumferential direction. Accordingly, the circumferential clearance between the projection and the cutout portion of the engaging portion in a state in which the projection is within the range of the notch portion of the engaging portion, not covered by the shielding piece of the shield member, wherein the metal The engaging portion of the rotor frame is passed through the notched portion of the engaged portion of the housing, and then the shielding piece of the shielding member is passed through the notched portion of the metal housing. Disc rotation motor.

The circumferential gap between the cutout portion and the projection of the engagement portion when the projection of the engagement portion is within the range of the cutout portion is set to be at least smaller than the plate thickness of the shielding member. 2. The disk rotation motor according to 1.

A prop-shaped portion is formed to protrude toward the top surface of the rotor frame at a position corresponding to the shielding piece of the disk alignment member, and this prop-shaped portion is brought into contact with the circumferential end surface of the shielding piece. The disk rotating motor according to claim 1.

2. The shielding member is axially pressed and fixed to the outer top surface of the rotor frame by a pressing spring portion formed at a position corresponding to the annular portion of the shielding member of the disk alignment member. The disk rotation motor described in 1.

2. The disk according to claim 1, wherein a projecting portion is formed on the engaging portion of the rotor frame so as to protrude upward in the axial direction, and a circumferential end surface of the shielding piece of the shielding member is brought into contact with the projecting portion. Motor for rotation.