JP2654168B2 - Optical system support device - Google Patents
Optical system support deviceInfo
- Publication number
- JP2654168B2 JP2654168B2 JP4518489A JP4518489A JP2654168B2 JP 2654168 B2 JP2654168 B2 JP 2654168B2 JP 4518489 A JP4518489 A JP 4518489A JP 4518489 A JP4518489 A JP 4518489A JP 2654168 B2 JP2654168 B2 JP 2654168B2
- Authority
- JP
- Japan
- Prior art keywords
- holding member
- optical
- springs
- objective lens
- spring
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
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- Optical Recording Or Reproduction (AREA)
Description
【発明の詳細な説明】 〔産業上の利用分野〕 本発明は、光ディスク等の光学的情報記録再生装置に
おいて、光学的情報記録媒体に光スポットを投射する対
物レンズ等の光学系の支持装置に関する。Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for supporting an optical system such as an objective lens for projecting a light spot on an optical information recording medium in an optical information recording / reproducing device such as an optical disk. .
〔従来の技術〕 光ピックアップは、小型化、薄型化の要求がある。薄
型化するためのものとしては、例えば対物レンズ駆動装
置に入射する光を対物レンズ駆動装置の直下においたミ
ラーにより光路を曲げるようにしたものがある。しか
し、この場合も光ピックアップの厚さは対物レンズ駆動
装置の高さにミラーの高さを加えた厚さより薄くするこ
とはできない。[Prior Art] Optical pickups are required to be smaller and thinner. As a device for reducing the thickness, for example, there is a device in which light incident on the objective lens driving device is bent by a mirror placed immediately below the objective lens driving device. However, also in this case, the thickness of the optical pickup cannot be made smaller than the thickness of the objective lens driving device plus the height of the mirror.
一方、実開昭56−77028号公報には、対物レンズ17を
保持する保持部材18の胴部中央に開口部18aを形成し、
そこにミラー19を配設しその下方にフォーカス方向駆動
用のコイル、磁気回路を設けるとともにミラーの上下に
駆動装置22の支持部材20,21を設けた内容が開示してあ
る。On the other hand, in Japanese Utility Model Laid-Open No. 56-77028, an opening 18a is formed at the center of the body of a holding member 18 for holding the objective lens 17,
There is disclosed that a mirror 19 is disposed there, a coil for driving in the focus direction and a magnetic circuit are provided below the mirror 19, and support members 20, 21 of a driving device 22 are provided above and below the mirror.
しかしながら、上記従来例（実開昭56−77028号公
報）は、上下２つの支持部材の間にミラーを配するた
め、支持部材間は入射する光の光束径よりも広い間隔を
とらねばならない。また、光束の下に一方の支持部材、
コイル、磁気回路が配設してあるために光ピックアップ
の厚さを薄くすることは困難であった。However, in the above-mentioned conventional example (Japanese Utility Model Application Laid-Open No. Sho 56-77028), since a mirror is disposed between the upper and lower support members, a space between the support members must be wider than the luminous flux diameter of the incident light. Also, one support member under the light beam,
It is difficult to reduce the thickness of the optical pickup because the coil and the magnetic circuit are provided.
本発明は、上記問題点を解決すべく提案されるもの
で、光ディスク等の光学的情報記録再生装置の小型化、
薄型化を図るために適した対物レンズ等の光学系支持装
置を提供することを目的としたものである。The present invention has been proposed to solve the above problems, and has been proposed to reduce the size of an optical information recording / reproducing apparatus such as an optical disk.
It is an object of the present invention to provide an optical system supporting device such as an objective lens which is suitable for reducing the thickness.
本発明は、上記目的を達成するため光学素子を保持す
る保持部材を駆動手段と複数の支持部材を介して所要方
向に変位可能に支持した光学系支持装置において、 光学素子直下に設けた反射部材への光源からの入射光
路側の支持部材を、保持部材を所要方向に変位しても該
保持部材が傾かない範囲で、前記入射光路側と反対側の
支持部材に対し非対称に設けたものである。In order to achieve the above object, the present invention provides an optical system supporting apparatus in which a holding member for holding an optical element is supported so as to be displaceable in a required direction via a driving means and a plurality of supporting members, wherein a reflecting member provided immediately below the optical element is provided. The supporting member on the side of the incident light path from the light source to the supporting member is provided asymmetrically with respect to the supporting member on the side opposite to the incident light path side, as long as the holding member does not tilt even if the holding member is displaced in a required direction. is there.
このようにすることにより入射光路側の支持部材を入
射光束あるいは光学系支持装置近傍の部材を回避するよ
うに設けることができる。In this manner, the supporting member on the incident optical path side can be provided so as to avoid the incident light beam or the member near the optical system supporting device.
第１図〜第３図は、本発明の第１実施例を示したもの
で、このうち第１図は全体斜視図である。対物レンズ１
は、フォーカスコイル２を側部外周に巻装し、トラッキ
ングコイル３をトラッキング方向（Ｘ方向）と平行な面
に固着した保持部材４上部に固定してある。ベース６の
中央Ｘ方向には切欠部７を形成してコの字状を呈してい
る。このベース６上のタンジエンシャル方向（Ｙ方向）
両側には対向する外ヨーク5aと内ヨーク5bを有するヨー
ク５を２個設けている。それぞれの外ヨーク5aの内側に
はマグネット８を固着しており、２組の磁気回路を形成
している。一方の外ヨーク5aの外側には固定部材９を固
着してあり、この固定部材９と前記保持部材４のトラッ
キング方向側部に設けた固定部4cには対応するようにそ
れぞれ４個の丸穴11,12を形成し、ここへバネ10a〜ｄの
端部を挿入し接着固定している。なお、13はそれぞれの
バネの固定部材９側の外周に一体的に設けたダンパであ
る。このように保持部材４を固定部材９に対して４本の
バネ10a〜ｄによりフォーカス方向（Ｚ方向）およびト
ラッキング方向に変位可能に支持しているので、フォー
カスコイル２あるいはトラッキングコイル３に電流を流
すとマグネット８との電磁作用により駆動力が生じ、保
持部材４はそれぞれの方向へ変位するのである。1 to 3 show a first embodiment of the present invention, of which FIG. 1 is an overall perspective view. Objective lens 1
In FIG. 2, the focus coil 2 is wound around the outer periphery of the side portion, and the tracking coil 3 is fixed on the holding member 4 fixed to a surface parallel to the tracking direction (X direction). A notch 7 is formed in the center X direction of the base 6 to have a U-shape. Tangential direction on this base 6 (Y direction)
On both sides, two yokes 5 having opposing outer yokes 5a and inner yokes 5b are provided. A magnet 8 is fixed inside each outer yoke 5a to form two sets of magnetic circuits. A fixing member 9 is fixed to the outside of one outer yoke 5a, and four round holes respectively correspond to the fixing member 9 and the fixing portion 4c provided on the side of the holding member 4 in the tracking direction. 11 and 12 are formed, and the ends of the springs 10a to 10d are inserted and fixed by bonding. Reference numeral 13 denotes a damper integrally provided on the outer periphery of each spring on the fixing member 9 side. Since the holding member 4 is supported by the four springs 10a to 10d so as to be displaceable in the focus direction (Z direction) and the tracking direction with respect to the fixed member 9, current is applied to the focus coil 2 or the tracking coil 3. When flowing, a driving force is generated by an electromagnetic action with the magnet 8, and the holding member 4 is displaced in each direction.
この駆動装置に入射する光は、第２図に示すようにレ
ーザダイオード等の発光素子と受光素子等を有する光学
ユニット15から出射され、対物レンズ１の直下にあるミ
ラー14により光路を90゜曲げられて対物レンズ１に入射
し光ディスク17の媒体面19上に光スポットを投射させる
のである。The light incident on the driving device is emitted from an optical unit 15 having a light emitting element such as a laser diode and a light receiving element as shown in FIG. 2, and the optical path is bent by 90 ° by a mirror 14 immediately below the objective lens 1. Then, the light is incident on the objective lens 1 and projected on the medium surface 19 of the optical disk 17.
第４図は、バネの位置関係について説明した図であ
る。駆動部の重心Ｇを原点とし、各バネA,B,C,Dの保持
部材における固定端での断面中心のＸ方向、Ｚ方向の座
標を各々（x1,z1）、（x2,z2）、（x3,z3）、（x4,z4）
とする。重心ＧにＸ方向、Ｚ方向の力Ｆが作用する場合
に、保持部材が傾かないようにするためには、重心Ｇの
周りの各板バネの反力によるモーメントの和が０になれ
ばよい。すなわちＸ方向について Ｚ方向について とすればよく、この式はバネの本数が変った場合にも適
用できる。なお、kxi,kziはそれぞれ各バネｉのＸ方向
及びＺ方向のバネ定数であり、ｎはバネの本数である。FIG. 4 is a diagram illustrating the positional relationship of the spring. With the center of gravity G of the drive unit as the origin, the coordinates of the cross-section center at the fixed end of the holding member of each of the springs A, B, C, and D in the X and Z directions are (x 1 , z 1 ), (x 2 , z 2 ), (x 3 , z 3 ), (x 4 , z 4 )
And In order to prevent the holding member from tilting when the forces F in the X and Z directions act on the center of gravity G, the sum of the moments due to the reaction forces of the leaf springs around the center of gravity G should be zero. . That is, for the X direction About Z direction This formula can be applied to the case where the number of springs changes. Here, kxi and kzi are the spring constants in the X and Z directions of each spring i, and n is the number of springs.
これを第１実施例の場合に当てはめてみると、４本の
バネ10a〜ｄの断面は同径の円形であるとともに同長で
ある。また、重心ＧとＸ方向、Ｚ方向の力の作用点を一
致させてあり、各バネ10a〜ｄは相互に平行にしてあ
る。そして各バネ10a〜ｄの断面中心のＸ方向、Ｚ方向
の座標はそれぞれ（−x1,z1）、（x1,z2）、（−x1,−z
1）、（x1,−z2）としてあるので、トラッキング方向
（Ｘ方向）、フォーカス方向（Ｚ方向）に保持部材４が
変位しても傾いてしまうことはない。Applying this to the case of the first embodiment, the cross sections of the four springs 10a to 10d are circular and have the same diameter and the same length. Also, the center of gravity G and the points of action of the forces in the X and Z directions are matched, and the springs 10a to 10d are parallel to each other. The coordinates of the center of the cross section of each of the springs 10a to 10d in the X direction and the Z direction are (−x 1 , z 1 ), (x 1 , z 2 ), (−x 1 , −z
1 ) and (x 1 , −z 2 ), so that the holding member 4 does not tilt even if the holding member 4 is displaced in the tracking direction (X direction) and the focus direction (Z direction).
一方、第３図に示すように保持部材４の光の出入側の
下部は、半円状凹部4aを形成し、保持部材４の下部内側
は対物レンズ１の直下に配設するミラー14を可能な限り
対物レンズ１側に近づけて配設できるように凹部4b（第
２図）を形成している。また、バネの保持部材４に設け
た固定部材4cは、光軸よりＹ方向における固定部材９か
ら離れる方向にずらして設けてあるとともに、ダンパ13
は固定部材９側のみに付設しているので、光学ユニット
15からの出射光路のうち光学ユニット15からミラー14に
至るＸ方向光路を重心Ｇを通るＸ軸寄りに近づけ、さら
にミラー14から対物レンズ１に至るＺ方向光路を短くす
ることができる。On the other hand, as shown in FIG. 3, the lower part of the holding member 4 on the light entrance / reception side forms a semicircular concave portion 4a, and the inside of the lower part of the holding member 4 can be a mirror 14 disposed immediately below the objective lens 1. A concave portion 4b (FIG. 2) is formed so that the concave portion 4b can be disposed as close to the objective lens 1 as possible. The fixing member 4c provided on the spring holding member 4 is provided so as to be displaced from the optical axis in a direction away from the fixing member 9 in the Y direction, and the damper 13 is provided.
Is provided only on the fixing member 9 side, so that the optical unit
The X-direction optical path from the optical unit 15 to the mirror 14 in the light path from the optical unit 15 can be made closer to the X-axis passing through the center of gravity G, and the Z-direction optical path from the mirror 14 to the objective lens 1 can be shortened.
また、バネ10a,10cの間隔をバネ10b,10dの間隔に比べ
て大にしてあるので、Ｘ軸及びＹ軸周りのねじれに対す
る剛性を高くできるとともに、保持部材４のバネ取付部
のうち光ディスクカートリッジ18の開口部18aの縁部18b
近傍に位置するバネ取付部4cは、第２図に示すようにＸ
方向軸に寄っているためその分、支持部材４を光ディス
ク17、光ディスクカートリッジ18に近づけることができ
る。Further, since the interval between the springs 10a and 10c is made larger than the interval between the springs 10b and 10d, the rigidity against the twist around the X axis and the Y axis can be increased, and the optical disc cartridge in the spring mounting portion of the holding member 4 can be increased. 18 opening 18a edge 18b
As shown in FIG. 2, the spring mounting portion 4c located in the vicinity
The support member 4 can be brought closer to the optical disk 17 and the optical disk cartridge 18 because it is closer to the direction axis.
このように本実施例では光ピックアップのＺ方向の寸
法を短くすることができるとともに記録媒体へも近づけ
ることができる。As described above, in this embodiment, the dimension of the optical pickup in the Z direction can be reduced, and the optical pickup can be made closer to the recording medium.
第５図〜第７図は、本発明の第２実施例を示したもの
であり、第１実施例と対応する個所には同一符号を付し
た（以下の実施例についても同様）。本実施例では上部
に対物レンズ１を固着した保持部材のＹ方向内側に対物
レンズ１を挟むように角柱状に巻回したフォーカスコイ
ル２を２個を設けている。保持部材４をトラッキング方
向、フォーカシング方向へ変位可能に支持するバネは３
本のみ設け、このうちバネ10bは保持部材４の重心Ｇと
同じ高さ位置に設け、バネ10a,10cはバネ10aを設けた保
持部材４側面と反対側面で、重心Ｇを通るＸ方向軸を挟
んで上下の等間隔位置に設けている。バネ10a〜ｃの断
面は総て円形であるが、直径はバネ10a,10cをｄとする
バネ10bを２1/4ｄとしバネ10bを太くしてある。第６図
に示すように各バネの断面中心を重心Ｇを原点として、
X,Z座標で表わすと10aは（−x1,z1）、10bは（x1,0）、
10cは（−x1,−z1）となるようにしてある。本実施例の
ような断面円形の片持はり状のバネの場合、バネ定数は
断面直径の４乗に比例するので、バネ10a,10bのバネ定
数に比べてバネ10bのバネ定数は２倍となる。したがっ
て、前記（１），（２）式を満足することになり保持部
材４をＸ方向、Ｚ方向に変位させても保持部材が傾くこ
とはない。なお、バネ10bの位置を（2x1,0）とすれば３
本のバネ10a〜ｃを同一径のバネとしてもよい。FIG. 5 to FIG. 7 show a second embodiment of the present invention, in which parts corresponding to those of the first embodiment are denoted by the same reference numerals (the same applies to the following embodiments). In the present embodiment, two focus coils 2 wound in a prism shape so as to sandwich the objective lens 1 are provided on the inner side in the Y direction of the holding member to which the objective lens 1 is fixed. The spring for supporting the holding member 4 so as to be displaceable in the tracking direction and the focusing direction is 3
The spring 10b is provided at the same height position as the center of gravity G of the holding member 4, and the springs 10a and 10c are the X-axis passing through the center of gravity G on the side opposite to the side of the holding member 4 provided with the spring 10a. It is provided at equal intervals above and below. Although the cross sections of the springs 10a to 10c are all circular, the diameter of the springs 10a and 10c is 2 1/4 d and the spring 10b is d thick. As shown in FIG. 6, the center of the cross section of each spring is defined as the center of gravity G,
Expressed in X and Z coordinates, 10a is (−x 1 , z 1 ), 10b is (x 1 , 0),
10c is set to be (−x 1 , −z 1 ). In the case of a cantilever spring having a circular cross section as in this embodiment, the spring constant is proportional to the fourth power of the cross-sectional diameter, so that the spring constant of the spring 10b is twice that of the springs 10a and 10b. Become. Therefore, the above expressions (1) and (2) are satisfied, and the holding member does not tilt even if the holding member 4 is displaced in the X direction and the Z direction. Incidentally, 3 if the position of the spring 10b and (2x 1, 0)
The springs 10a to 10c may be springs having the same diameter.
次にミラー14は、対物レンズ１直下のベース６上に固
着している。他の構成については、第１実施例とほぼ同
様である。Next, the mirror 14 is fixed on the base 6 directly below the objective lens 1. Other configurations are almost the same as in the first embodiment.
以上のごとく構成してあるので、本実施例の場合も対
物レンズ１に対してミラー14を近づけることができるの
で、光ピックアップのＺ方向の寸法を短くすることがで
きる。また、保持部材４を支持するバネは３本であり、
光ピックアップの組立工数の減少を図れる。また、ミラ
ー14をベース６に直接固着してあるので、ミラー14に対
する対物レンズ１の傾きや位置の精度を出し安い。な
お、保持部材４に形成したミラー14配設用の凹部4bが大
きいため、保持部材４の重心が上がり共振等の問題が発
生する場合には、フォーカスコイル２の取付け位置を下
げてやれば補正のためのウエイト等を設ける必要はな
い。With the configuration as described above, the mirror 14 can be brought closer to the objective lens 1 also in the present embodiment, so that the dimension of the optical pickup in the Z direction can be shortened. The number of springs supporting the holding member 4 is three,
The number of assembling steps of the optical pickup can be reduced. Also, since the mirror 14 is directly fixed to the base 6, the accuracy of the inclination and the position of the objective lens 1 with respect to the mirror 14 is reduced and the cost is reduced. When the concave portion 4b for disposing the mirror 14 formed in the holding member 4 is large, and the center of gravity of the holding member 4 rises and a problem such as resonance occurs, the mounting position of the focus coil 2 is lowered to correct the problem. There is no need to provide weights for the purpose.
第８図は、本発明の第３実施例を示したもので、これ
は対物レンズ１を１方向、例えばＺ方向へ変位させる装
置に適用したものである。第２実施例とほぼ同様の構成
であるが、本実施例ではバネの代りに短冊状の３枚の板
バネ16a〜ｃを用いて、保持部材４をＺ方向にのみ変位
可能に支持している。他方向への対物レンズを介して光
スポットの記録媒体への追従は、別の装置による。３枚
の板バネ16a〜ｃは、厚さ（Ｚ方向）と長さ（Ｙ方向）
が総て同じであるが、幅（Ｘ方向）は、板バネ16aと16c
は同じにしてあるが、板バネ16bはそれらの２倍として
ある。そして、３枚の板バネ16a〜ｃの中心と保持部材
４の重心ＧとのＸ方向距離は、同じにしてある。したが
って、前記（１）式を満足することとなり、保持部材４
がＺ方向に変位しても傾くことはない。この実施例にお
いても光ピックアップのＺ方向の寸法を短くすることが
できることは、前記実施例と同様である。FIG. 8 shows a third embodiment of the present invention, which is applied to a device for displacing the objective lens 1 in one direction, for example, the Z direction. Although the configuration is almost the same as that of the second embodiment, this embodiment uses three strip-shaped leaf springs 16a to 16c instead of the springs to support the holding member 4 so as to be displaceable only in the Z direction. I have. Tracking of the light spot to the recording medium via the objective lens in the other direction is performed by another device. The three leaf springs 16a to 16c have a thickness (Z direction) and a length (Y direction).
Are all the same, but the width (in the X direction) is
Are the same, but the leaf spring 16b is twice as large. The distance between the centers of the three leaf springs 16a to 16c and the center of gravity G of the holding member 4 in the X direction is the same. Therefore, the above expression (1) is satisfied, and the holding member 4
Does not tilt even if displaced in the Z direction. Also in this embodiment, the dimension of the optical pickup in the Z direction can be shortened, as in the previous embodiment.
以上のごとく、本発明はミラー等を含めた対物レンズ
に至る光軸方向の寸法を短くでき、また光ディスク等の
記録媒体へ光ピックアップを近づけることができるの
で、光ピックアップの薄型化を実現できるとともに光学
的情報記録再生装置の小型化、薄型化を実現できる。As described above, the present invention can shorten the dimension in the optical axis direction to the objective lens including the mirror and the like, and can bring the optical pickup closer to a recording medium such as an optical disk, thereby realizing a thin optical pickup. The size and thickness of the optical information recording / reproducing device can be reduced.
第１図は、本発明の第１実施例を示す全体斜視図、 第２図は、同部分断面図、 第３図は、同側面図、 第４図は、バネの位置関係を示す説明図、 第５図は、本発明の第２実施例を示す全体斜視図、 第６図は、同部分断面図、 第７図は、側部断面図、 第８図は、本発明の第３実施例を示す部分断面図、 第９図は、従来例を示す一部取り除いた斜視図である。 １……対物レンズ、４……保持部材 10a〜ｄ……バネ、14……ミラー 15……光学ユニット FIG. 1 is an overall perspective view showing a first embodiment of the present invention, FIG. 2 is a partial sectional view of the same, FIG. 3 is a side view of the same, and FIG. 5 is an overall perspective view showing a second embodiment of the present invention, FIG. 6 is a partial sectional view of the same, FIG. 7 is a side sectional view, and FIG. 8 is a third embodiment of the present invention. FIG. 9 is a partially cutaway perspective view showing a conventional example. 1 Objective lens 4 Holding member 10a-d Spring 14 Mirror 15 Optical unit
Claims (1)
複数の支持部材を介して所要方向に変位可能に支持した
光学系支持装置において、 光学素子直下に設けた反射部材への光源からの入射光路
側の支持部材を、保持部材を所要方向に変位しても該保
持部材が傾かない範囲で、前記入射光路側と反対側の支
持部材に対し非対称に設けたことを特徴とする光学系支
持装置。An optical system supporting apparatus which supports a holding member for holding an optical element in a required direction via a driving means and a plurality of supporting members so as to be displaceable in a required direction. An optical system, wherein the support member on the side of the incident optical path is provided asymmetrically with respect to the support member on the side opposite to the side of the incident optical path to the extent that the holding member does not tilt even if the holding member is displaced in a required direction. Support device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4518489A JP2654168B2 (en) | 1989-02-28 | 1989-02-28 | Optical system support device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4518489A JP2654168B2 (en) | 1989-02-28 | 1989-02-28 | Optical system support device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH02226523A JPH02226523A (en) | 1990-09-10 |
| JP2654168B2 true JP2654168B2 (en) | 1997-09-17 |
Family
ID=12712188
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4518489A Expired - Fee Related JP2654168B2 (en) | 1989-02-28 | 1989-02-28 | Optical system support device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2654168B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103700378A (en) * | 2012-09-27 | 2014-04-02 | 日立视听媒体股份有限公司 | Optical pickup |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3245433B2 (en) * | 1991-08-16 | 2002-01-15 | オリンパス光学工業株式会社 | Optical pickup |
| JP2001195756A (en) * | 2000-01-14 | 2001-07-19 | Sankyo Seiki Mfg Co Ltd | Optical pickup device and method for manufacturing the same |
-
1989
- 1989-02-28 JP JP4518489A patent/JP2654168B2/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103700378A (en) * | 2012-09-27 | 2014-04-02 | 日立视听媒体股份有限公司 | Optical pickup |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH02226523A (en) | 1990-09-10 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |