JPH11232653A - Optical pickup - Google Patents

Optical pickup

Info

Publication number
JPH11232653A
JPH11232653A JP3702298A JP3702298A JPH11232653A JP H11232653 A JPH11232653 A JP H11232653A JP 3702298 A JP3702298 A JP 3702298A JP 3702298 A JP3702298 A JP 3702298A JP H11232653 A JPH11232653 A JP H11232653A
Authority
JP
Japan
Prior art keywords
female screw
optical pickup
objective lens
bolt
lens
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.)
Pending
Application number
JP3702298A
Other languages
Japanese (ja)
Inventor
Ryuichi Awaya
龍一 粟屋
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Sharp Corp
Original Assignee
Sharp Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Sharp Corp filed Critical Sharp Corp
Priority to JP3702298A priority Critical patent/JPH11232653A/en
Publication of JPH11232653A publication Critical patent/JPH11232653A/en
Pending legal-status Critical Current

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  • Moving Of The Head For Recording And Reproducing By Optical Means (AREA)

Abstract

PROBLEM TO BE SOLVED: To improve a yield by increasing an adjustment amount of an attitude adjustment mechanism for an objective lens of an optical pickup. SOLUTION: A spherical convex part 5a set at a lens mount stage 5 where an objective lens is mounted and a spherical concave part 4a of the same radius as the convex part 5a set at a base 4 are brought in touch with each other, so that the lens mount stage 5 can be freely inclined on the center of the spherical face. An attitude of the objective lens is adjusted by a clamp amount whereby two bolts 8 urged by a bolt 10 and a compression spring 11 clamp a female screw part 5c of the lens mount stage 5. In the thus-constituted attitude adjustment mechanism, a count of threads of the female screw part 5c is not larger than one.

Description

【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION

【0001】[0001]

【発明の属する技術分野】本発明は光ディスク装置に用
いられる光ピックアップに関し、特にレーザ光を集光す
る対物レンズの姿勢調整機構部に関する。
[0001] 1. Field of the Invention [0002] The present invention relates to an optical pickup used in an optical disk device, and more particularly to an attitude adjusting mechanism of an objective lens for condensing a laser beam.

【0002】[0002]

【従来の技術】図1は従来の光ピックアップの構成を示
す。半導体レーザ(図示せず)から照射されたレーザ光
1は対物レンズ2によって光ディスク3上に集光され、
レーザ光1の反射光がフォトダイオード(図示せず)の
受光面に照射されて記録信号が読み取られるようになっ
ている。対物レンズ2はレンズ取付板5に取り付けられ
ており、レンズ取付板5は基台4との間で対物レンズ2
の光軸とレーザ光1の光軸とを一致させるように姿勢調
整機構30を構成している。
2. Description of the Related Art FIG. 1 shows a configuration of a conventional optical pickup. A laser beam 1 emitted from a semiconductor laser (not shown) is converged on an optical disc 3 by an objective lens 2,
The reflected light of the laser light 1 is applied to a light receiving surface of a photodiode (not shown) to read a recording signal. The objective lens 2 is mounted on a lens mounting plate 5, and the lens mounting plate 5 is mounted between the base 4 and the objective lens 2.
The attitude adjusting mechanism 30 is configured so that the optical axis of the laser beam 1 and the optical axis of the laser beam 1 coincide with each other.

【0003】さらに詳細を図2を参照して説明する。同
図においてレンズホルダ25には対物レンズ2、フォー
カシングコイル24が設置され、さらにフォーカシング
コイル24にはトラッキングコイル23が接着されてい
る。レンズホルダ25はヒンジ6によって図中x軸方向
とz軸方向とに微少移動可能なようにレンズ取付板5に
取り付けられている。レンズ取付板5には磁性体からな
るヨーク21a、21bが設けられてヨーク21aに接
着された磁石22によって磁場を構成し、ヨーク21b
がフォーカシングコイル24に挿通して位置決めされる
ことでフォーカシングコイル24とトラッキングコイル
23の磁界有効部23aとに磁界を付与している。
[0003] Further details will be described with reference to FIG. In the figure, the objective lens 2 and the focusing coil 24 are installed on the lens holder 25, and the tracking coil 23 is adhered to the focusing coil 24. The lens holder 25 is attached to the lens attachment plate 5 by the hinge 6 so that it can be slightly moved in the x-axis direction and the z-axis direction in the figure. The lens mounting plate 5 is provided with yokes 21a and 21b made of a magnetic material, and a magnetic field is formed by a magnet 22 bonded to the yoke 21a.
Is inserted into the focusing coil 24 and positioned to apply a magnetic field to the focusing coil 24 and the magnetic field effective portion 23 a of the tracking coil 23.

【0004】フォーカシングコイル24にフレキシブル
基板7を通じて電流が流れるとフレミング左手の法則に
よって電磁力が生じレンズホルダ25をz方向に移動さ
せてフォーカシング動作が行われる。トラッキングコイ
ル23にフレキシブル基板7を通じて電流が流れると磁
界有効部23aを流れる電流により同様に生じる電磁力
によってレンズホルダ25をx軸方向に移動させてトラ
ッキング動作が行われるようになっている。
When a current flows through the focusing coil 24 through the flexible substrate 7, an electromagnetic force is generated by the Fleming's left hand rule, and the lens holder 25 is moved in the z direction to perform a focusing operation. When a current flows through the tracking coil 23 through the flexible substrate 7, the tracking operation is performed by moving the lens holder 25 in the x-axis direction by an electromagnetic force similarly generated by the current flowing through the magnetic field effective portion 23a.

【0005】レンズ取付板5にはレーザ光が通過する貫
通孔5bが設けられ貫通孔5bの周囲に図中下方に突出
した球面状の凸部5aが形成されている。基台4にはレ
ーザ光が通過する貫通孔4bが設けられ貫通孔4bの周
囲に前記凸部5aの外周と同じ半径を有する球面状の凹
部4aが形成されている。
The lens mounting plate 5 is provided with a through hole 5b through which laser light passes, and a spherical convex portion 5a projecting downward in the drawing is formed around the through hole 5b. The base 4 is provided with a through hole 4b through which the laser beam passes, and a spherical concave portion 4a having the same radius as the outer periphery of the convex portion 5a is formed around the through hole 4b.

【0006】レンズ取付板5と基台4とは、凸部5aと
凹部4aとが当接し該球面の中心を支点としてレンズ取
付板5と基台4とが互いに傾斜自在となるように配置さ
れている。基台4に設けられた挿通孔4dを通してレン
ズ取付台5に設けられた雌ねじ部5dに圧縮ばね11を
介して固定されたボルト10と、基台4に設けられた挿
通孔4cを通してレンズ取付台5に設けられた雌ねじ部
5cに固定された2つのボルト8とによってレンズ取付
台5の傾斜姿勢が決められている。
The lens mounting plate 5 and the base 4 are arranged such that the convex portion 5a and the concave portion 4a are in contact with each other, and the lens mounting plate 5 and the base 4 can be inclined with respect to the center of the spherical surface. ing. A bolt 10 fixed through a compression spring 11 to a female screw portion 5d provided in the lens mount 5 through an insertion hole 4d provided in the base 4, and a lens mount through an insertion hole 4c provided in the base 4. The inclined posture of the lens mount 5 is determined by two bolts 8 fixed to the female screw portion 5c provided on the lens mount 5.

【0007】さらにレンズ取付板5と基台4との傾斜姿
勢を調整する方法について図3を参照して説明する。同
図は姿勢調整機構部30の断面図を示しており、基台4
に設けられた挿通孔4dを通してレンズ取付板5はボル
ト10によって1箇所を固定され、圧縮ばね11が挿入
される座グリ4eの底面に当接してこの位置においてレ
ンズ取付板5を図中下方に付勢している。
A method for adjusting the inclination of the lens mounting plate 5 and the base 4 will be described with reference to FIG. FIG. 3 is a cross-sectional view of the posture adjustment mechanism unit 30,
The lens mounting plate 5 is fixed at one place by a bolt 10 through an insertion hole 4d provided at the bottom, and abuts against the bottom surface of a counterbore 4e in which the compression spring 11 is inserted. It is energizing.

【0008】圧縮ばね11と支点Bを挟んで反対側にあ
るボルト8は、圧縮ばね11によって図中上方へ付勢さ
れるため挿通孔4cの周辺に座面8aを圧接されながら
挿通孔4cを通してレンズ取付板5の雌ねじ部5cと噛
み合って締め付けられており、この締め付け量によって
レンズ取付板5と基台4との傾斜が調整されて、対物レ
ンズ2(図2参照)の光軸とレーザ光1(図1参照)の
光軸とが一致するように対物レンズ2の姿勢調整が行わ
れるようになっている。
The bolt 8 on the opposite side of the fulcrum B from the compression spring 11 is urged upward in the drawing by the compression spring 11, so that the seat 8a is pressed against the seating surface 8a around the insertion hole 4c and passes through the insertion hole 4c. The screw is engaged with the female screw portion 5c of the lens mounting plate 5, and the inclination between the lens mounting plate 5 and the base 4 is adjusted by the amount of tightening, so that the optical axis of the objective lens 2 (see FIG. 2) and the laser beam are adjusted. The posture of the objective lens 2 is adjusted so that the optical axis of the objective lens 1 (see FIG. 1) coincides.

【0009】このとき姿勢調整には例えば先に説明した
図2におけるxz平面内の傾斜とyz平面内の傾斜との
2方向への傾斜機構が必要なためにボルト8は2箇所に
設けられ、支点と2つのボルト8の位置とはxy平面に
投影して一直線上とならないようになっている。
At this time, the bolts 8 are provided at two places because the posture adjustment requires, for example, a tilting mechanism in two directions of the tilt in the xz plane and the tilt in the yz plane in FIG. 2 described above. The fulcrum and the positions of the two bolts 8 are projected on the xy plane so as not to be on a straight line.

【0010】[0010]

【発明が解決しようとする課題】しかしながらこのよう
な構成によって傾斜調整した状態を図4に示すと、挿通
孔4cの内壁12とボルト8とが当接することによって
調整可能な量が制限されていた。これはレンズ取付板5
の雌ねじ部5cの詳細を図5に示すと、(レンズ取付板
5の厚み)/(ねじピッチ)の数のねじ山とボルト8と
が噛み合うことでボルト8がレンズ取付板5とほぼ垂直
に保持されるためであり、大きな調整量を必要とする場
合は調整不能となり歩留まりの低下を招いていた。
However, FIG. 4 shows a state in which the inclination is adjusted by such a configuration, and the adjustable amount is limited by the contact between the inner wall 12 of the insertion hole 4c and the bolt 8. . This is the lens mounting plate 5
FIG. 5 shows the details of the female screw portion 5c of FIG. 5 in which the number of threads of (thickness of the lens mounting plate 5) / (thread pitch) meshes with the bolt 8 so that the bolt 8 is substantially perpendicular to the lens mounting plate 5. This is because it is held, and when a large adjustment amount is required, the adjustment becomes impossible and the yield is reduced.

【0011】これを回避するため挿通孔4cの直径を大
きくすることが考えられるが挿通孔4cの最大直径はボ
ルト8の頭部の直径によって決まるため、挿通孔4cの
直径を大きくするとボルト8に市販品を使用できずコス
トの増大を招く問題があった。
To avoid this, it is conceivable to increase the diameter of the insertion hole 4c. However, since the maximum diameter of the insertion hole 4c is determined by the diameter of the head of the bolt 8, if the diameter of the insertion hole 4c is increased, the bolt 8 becomes larger. There was a problem that a commercial product could not be used and the cost was increased.

【0012】本発明は簡単に姿勢調整量を大きくし歩留
まりを向上させる光ピックアップを提供することを目的
とする。
SUMMARY OF THE INVENTION It is an object of the present invention to provide an optical pickup which can easily increase the amount of posture adjustment and improve the yield.

【0013】[0013]

【課題を解決するための手段】上記目的を達成するため
に本発明は、対物レンズを保持する保持部材の所定部分
を基台に対し調整用ボルトを介して取り付ける光ピック
アップにおいて、前記調整用ボルトと噛合する前記保持
部材の雌ねじ部の厚みを該雌ねじ部に部分的にねじの谷
がないように薄くしている。
To achieve the above object, the present invention provides an optical pickup in which a predetermined portion of a holding member for holding an objective lens is attached to a base via an adjusting bolt. The thickness of the female screw portion of the holding member that engages with the screw member is thinned so that the female screw portion does not partially have a thread root.

【0014】この構成によると、対物レンズが保持され
た保持部材がボルトによって位置決めされボルトの締め
付け量によって傾斜を調整して対物レンズの姿勢調整が
行われる。この時ボルトと締め付けられる雌ねじ部分は
部分的にねじの谷がないように薄く形成されボルトを雌
ねじとは1山以下のねじ山で噛み合って保持部材が固定
され、ボルトと雌ねじ部との間に生じる隙間によって保
持部材とボルトとが垂直でなくても保持部材を位置決め
できるようになっている。
According to this structure, the holding member holding the objective lens is positioned by the bolt, and the inclination of the objective lens is adjusted by adjusting the amount of tightening of the bolt to adjust the attitude of the objective lens. At this time, the female screw part to be tightened with the bolt is formed thin so that there is no thread valley partially, the bolt is meshed with the female screw with one or less threads, the holding member is fixed, and between the bolt and the female screw part The resulting gap allows the holding member to be positioned even when the holding member and the bolt are not perpendicular.

【0015】また本発明は、前記基台と前記保持部材と
はレーザ光が通る貫通孔を有し、前記保持部材の前記貫
通孔の周囲に設けられた球面状の凸部と、前記基台の前
記貫通孔の周囲に設けられた球面状または前記凸部と接
する部分が円形の凹部とが当接して支点を構成し、前記
凸部の球面の中心と前記対物レンズの中心とが一致して
いる。
Further, according to the present invention, the base and the holding member each have a through hole through which a laser beam passes, and a spherical projection provided around the through hole of the holding member; A portion provided in contact with the spherical shape or the convex portion provided around the through hole abuts the circular concave portion to form a fulcrum, and the center of the spherical surface of the convex portion coincides with the center of the objective lens. ing.

【0016】この構成によるとレーザ光が通る貫通孔が
設けられた保持部材の貫通孔の周囲に設けられた球面状
の凸部と、基台の貫通孔の周囲に設けられた球面状や円
錐面状などの凹部とが当接して対物レンズの中心に支点
を構成し、保持部材が支点とボルトによって位置決めさ
れボルトの締め付け量によって傾斜を調整して対物レン
ズの姿勢調整が行われる。この時の調整によって対物レ
ンズの平行移動を伴わずに向きが変えられるようになっ
ている。
According to this configuration, the spherical convex portion provided around the through hole of the holding member provided with the through hole through which the laser beam passes, and the spherical or conical portion provided around the through hole of the base. The fulcrum is formed at the center of the objective lens by abutment with a concave portion such as a surface, and the holding member is positioned by the fulcrum and the bolt, and the inclination of the objective lens is adjusted by adjusting the amount of tightening of the bolt to adjust the posture of the objective lens. At this time, the direction can be changed without the parallel movement of the objective lens.

【0017】また本発明は、前記雌ねじ部の厚みが座グ
リによって規制されている。この構成によるとボルトが
1山以下の雌ねじ部と噛み合って姿勢調整が行われ、雌
ねじ部は保持部材に設けられた座グリによってねじの谷
のないような厚みに形成されている。
Further, according to the present invention, the thickness of the female screw portion is regulated by a spot facing. According to this configuration, the posture is adjusted by engaging the bolt with the female screw portion having one or less ridges, and the female screw portion is formed by a counterbore provided on the holding member to have a thickness such that there is no screw root.

【0018】また本発明は、前記座グリは皿状である。
この構成によるとボルトが1山以下の雌ねじ部と噛み合
って姿勢調整が行われ、雌ねじ部は保持部材に設けられ
た皿座グリによってねじ1山以下の厚みに形成されてい
る。
According to the present invention, the spot facing is dish-shaped.
According to this configuration, the posture is adjusted by engaging the bolt with the female screw portion having one or less threads, and the female screw portion is formed to have a thickness of one screw or less by the countersunk bar provided on the holding member.

【0019】[0019]

【発明の実施の形態】本発明の実施形態を図を参照して
説明する。説明の便宜上従来例と同じ部材については同
一の符号を付している。図6は本発明の実施形態のレン
ズ取付板5(保持部材)の雌ねじ部5cの詳細を示す断
面図である。同図によると、レンズ取付板5の片面に皿
状の座グリ5eを設けて雌ねじ部5cの厚みtを小さく
しねじ山は1山以下になっている。このようなレンズ取
付板5を用いて姿勢調整機構30を構成して姿勢調整を
行った状態を図7に示す。
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to the drawings. For convenience of explanation, the same members as those in the conventional example are denoted by the same reference numerals. FIG. 6 is a sectional view showing details of the female screw portion 5c of the lens mounting plate 5 (holding member) of the embodiment of the present invention. According to the figure, a dish-shaped counterbore 5e is provided on one surface of the lens mounting plate 5, the thickness t of the female screw portion 5c is reduced, and the number of threads is one or less. FIG. 7 shows a state in which the posture adjustment mechanism 30 is configured using such a lens mounting plate 5 and the posture is adjusted.

【0020】同図によると、レンズ取付板5の傾斜が大
きくてなっても挿通孔4cの内壁12にボルト8は当接
しない。これは、雌ねじ部4cのねじ山が1山以下のた
めにボルト8の雄ねじ部との間の隙間が生じてボルト8
をレンズ取付板5と垂直でなくても保持することができ
る状態になり、ボルト10と圧縮ばね11とによって付
勢させることによってボルト8の座面8aのほぼ全周が
基台4と接してボルト8を基台4に対して垂直に維持す
るようになるためである。
According to the figure, even if the inclination of the lens mounting plate 5 becomes large, the bolt 8 does not come into contact with the inner wall 12 of the insertion hole 4c. This is because the female thread 4c has one or less thread and a gap is formed between the female thread 4c and the male thread of the bolt 8 so that the bolt 8
Can be held even if it is not perpendicular to the lens mounting plate 5. By being urged by the bolt 10 and the compression spring 11, almost the entire circumference of the bearing surface 8 a of the bolt 8 comes into contact with the base 4. This is because the bolt 8 is maintained perpendicular to the base 4.

【0021】図12を参照してさらに詳細に説明する。
図12はレンズ取付板5の雌ねじ部5cの詳細を示す上
面図であり、26はねじの谷部分を示し27はねじ山の
頂点部分を示している。また28はレンズ取付板5の表
面と裏面における頂点まで到達していないねじ山のエッ
ジ部分を示している。(a)は雌ねじ部5c部分の厚みが
ねじ山1山以上の場合を示しており上面から視てねじ山
の頂点27とねじの谷26が雌ねじの全周にある。
A more detailed description will be given with reference to FIG.
FIG. 12 is a top view showing the details of the female screw portion 5c of the lens mounting plate 5, in which 26 indicates a thread root portion, and 27 indicates a vertex portion of the screw thread. Reference numeral 28 denotes an edge portion of the screw thread that does not reach the top of the front and back surfaces of the lens mounting plate 5. (a) shows a case where the thickness of the female screw portion 5c is one or more threads, and the apex 27 of the screw thread and the thread valley 26 are all around the female screw when viewed from above.

【0022】(b)は雌ねじ部5c部分の厚みがねじ山
1/2山の場合を示しており、ねじ山の谷は範囲Gの間
にだけ存在し、範囲Gと点対称の位置にねじ山の頂点2
7がある。この時ねじ山の頂点27のない斜線で示すE
部分に内径d1(ボルト8の谷径)に対して隙間が生じ
ている。
FIG. 3B shows a case where the thickness of the female screw portion 5c is a half screw thread, and the thread valley exists only between the areas G. Mountain Peak 2
There are seven. At this time, E shown by a diagonal line without the apex 27 of the thread
A gap is formed in the portion with respect to the inner diameter d1 (trough diameter of the bolt 8).

【0023】この隙間は雌ねじ部5c部分の厚みがねじ
山1山以下になると発生し厚みが薄くなるに従って大き
くなる。(c)に示すように雌ねじ部5c部分の厚みが
ねじ山1/4山の場合には、ねじの谷26は範囲Hの間
にだけ存在し、範囲Hと点対称な範囲H’にねじ山の頂
点27がある。ねじ山の頂点27のないF部分が内径d
1(ボルト8の谷径)との隙間となり隙間が大きくなっ
ている。
This gap is formed when the thickness of the female screw portion 5c is less than one thread, and becomes larger as the thickness becomes thinner. In the case where the thickness of the female screw portion 5c is one-fourth of the thread as shown in (c), the thread valley 26 exists only in the range H, and the thread is located in a range H ′ point-symmetric with the range H. There is a mountain peak 27. The portion F without the apex 27 of the thread is the inner diameter d.
1 (the root diameter of the bolt 8) and the gap is large.

【0024】従って雌ねじ部にねじの谷のない部分が生
じるように雌ねじ部5c部分の厚みをねじ山1山以下ま
で薄くすると雌ねじとボルト8との間の隙間が大きくな
り、これによって姿勢調整量が大きくなり光ピックアッ
プの製造歩留まりを向上させることができる。
Therefore, if the thickness of the female screw portion 5c is reduced to one thread or less so that a threadless portion is formed in the female screw portion, the gap between the female screw and the bolt 8 becomes large, and the posture adjustment amount is thereby increased. And the production yield of the optical pickup can be improved.

【0025】また雌ねじ部5c部分の厚みの下限はボル
ト8と噛み合うように隙間と山の高さおよび信頼性を考
慮して決められるが、図12の(b)に示すようにねじ
山0.5山以下の厚みになると雌ねじの内径d1を有す
る部分がなくなってボルト8との引っ掛かりを維持でき
なくなる可能性があるのでねじ山0.5山以上の厚みが
望ましい。また、座グリ5eは図8に示すような円筒状
や長孔状にしても同様の効果を得ることができる。
The lower limit of the thickness of the female screw portion 5c is determined in consideration of the height and reliability of the gap and the ridge so as to mesh with the bolt 8, but as shown in FIG. If the thickness is less than 5 threads, there is a possibility that the portion having the inner diameter d1 of the female screw is lost and it is not possible to maintain the engagement with the bolt 8, so that the thickness of 0.5 threads or more is desirable. The same effect can be obtained by forming the spot facing 5e into a cylindrical shape or a long hole shape as shown in FIG.

【0026】また、支点や付勢手段は他の方法によって
構成してもよく、例えば図9に示すように球面状の凸部
4fと凸部4fと当接する凹部5fとを基台4とレンズ
取付板5の端部に設けて支点Bを構成し、2つのボルト
8のいずれとも支点Bを挟んで反対側の位置に引っ張り
ばね14を設置してもボルト8の部分の基台4とレンズ
取付板5とを遠ざけるように付勢させることができる。
The fulcrum and the urging means may be formed by other methods. For example, as shown in FIG. 9, a spherical projection 4f and a recess 5f which comes into contact with the projection 4f are used to mount the base 4 and the lens. The fulcrum B is provided at the end of the mounting plate 5, and the base 4 and the lens of the bolt 8 are provided even if the tension spring 14 is installed at a position opposite to the fulcrum B with respect to any of the two bolts 8. The mounting plate 5 can be urged away from the mounting plate 5.

【0027】また、図10に示すように球面状の凸部5
aと凸部5aと当接する凹部4aとを基台4とレンズ取
付板5の端部に設けて支点Bを構成し、2つのボルト8
のいずれとも支点Bに対して同じ側の位置に圧縮ばね1
5を設置しても同様にボルト8の部分の基台4とレンズ
取付板5とを遠ざけるように付勢させることができる。
また、支点および付勢手段を設けずに3点のボルトで調
整するようにしてもよい。
Further, as shown in FIG.
a and a concave portion 4a that comes into contact with the convex portion 5a are provided at the ends of the base 4 and the lens mounting plate 5 to form a fulcrum B.
Are located on the same side with respect to the fulcrum B.
Even if 5 is installed, the base 4 of the bolt 8 and the lens mounting plate 5 can be similarly urged away from each other.
Further, the adjustment may be performed with three bolts without providing the fulcrum and the urging means.

【0028】前述の図9や図10に示すような姿勢調整
機構30においては、対物レンズ2の光軸をレーザ光の
光軸と平行に調整した後半導体レーザと対物レンズ2と
を図示しない移動機構によって相対的に平行移動させて
双方の光軸を一致させる必要があり、平行移動時の真直
度によって姿勢が狂うことがあったり、移動機構がない
場合は別途設ける必要がありコストが増大する。
In the attitude adjusting mechanism 30 as shown in FIGS. 9 and 10, the optical axis of the objective lens 2 is adjusted to be parallel to the optical axis of the laser beam, and then the semiconductor laser and the objective lens 2 are moved (not shown). It is necessary to perform parallel translation by a mechanism to make both optical axes coincide, and the straightness at the time of parallel movement may cause the posture to go out of order. .

【0029】先に説明した図7に示すように貫通孔4
b、5bの周囲に球面状の凸部5aと凹部4aとを設け
て支点Bを構成し支点Bに対物レンズ2の中心が一致し
て設置されるような構成にしておき、対物レンズ2設置
後姿勢調整を行うようにすると姿勢調整時に対物レンズ
2の中心が移動しないので調整が容易になるとともに移
動機構を必要としないので望ましい。
As shown in FIG.
b, a convex portion 5a and a concave portion 4a are provided around the periphery of 5b to form a fulcrum B so that the center of the objective lens 2 is set to coincide with the fulcrum B, and the objective lens 2 is installed. It is desirable to perform the rear posture adjustment because the center of the objective lens 2 does not move at the time of posture adjustment, so that the adjustment becomes easy and a moving mechanism is not required.

【0030】また、一方のボルト8の位置をA点とし、
他方のボルト8の位置をC点としたときにA点の調整で
レンズ取付板5は線BC(Bは支点B)を軸に傾斜し、
C点の調整でレンズ取付板5は線ABを軸に傾斜するた
めこれら2線をレーザ光と垂直な面に投影した線B’
C’線A’B’とが直交する位置にない場合、一方の調
整が他方の傾斜方向に影響を与えるため作業が繁雑にな
る。このためボルト8の位置は線A’B’と線B’C’
とが直交する位置に配置する方が作業が容易になるので
望ましい。
The position of one of the bolts 8 is designated as point A,
When the position of the other bolt 8 is set to the point C, the lens mounting plate 5 is tilted about the line BC (B is the fulcrum B) by adjustment of the point A,
Since the lens mounting plate 5 is tilted about the line AB by adjusting the point C, the line B ′ is obtained by projecting these two lines on a plane perpendicular to the laser beam.
If the C 'line A'B' is not at a position orthogonal to the line, the operation becomes complicated because one adjustment affects the other inclination direction. Therefore, the position of the bolt 8 is determined by the lines A'B 'and B'C'.
It is preferable to arrange them at positions orthogonal to each other because the work becomes easier.

【0031】なお、支点Bは球面状の凸部5aと球面状
の凹部4aとの当接によって構成されているが、図11
に示すように円錐状(図11の(a)、(b))や円筒
状(図11の(c))の凹部に形成しても凸部5aの球
面と接触する部分が円形であれば支点を構成することが
できる。また凹部4aは点接触するように平面に構成し
てもよいし、この際には凸部5aを円錐形にしてもよ
い。また別に球状の部材を設けてレンズ取付板5と基台
4とに凹部を設けてもよく他の方法によって支点を構成
してもよい。
The fulcrum B is formed by the contact between the spherical convex portion 5a and the spherical concave portion 4a.
Even if it is formed in a conical (FIG. 11 (a), (b)) or cylindrical (FIG. 11 (c)) concave portion as shown in FIG. A fulcrum can be configured. Further, the concave portion 4a may be formed in a plane so as to make a point contact, and in this case, the convex portion 5a may be formed in a conical shape. Alternatively, a concave member may be provided in the lens mounting plate 5 and the base 4 by providing a spherical member, and the fulcrum may be formed by another method.

【0032】また、レンズ取付板5にはねじ山1山以下
の厚みの板材を使用してもよいが座グリ5eを設けた方
がレンズ取付板5の強度を維持したまま1山以下の雌ね
じ部を形成できるので望ましい。また、挿通孔4cを基
台4に設け雌ねじ部5cをレンズ取付板5に設けたが、
挿通孔をレンズ取付板5に設け雌ねじ部を基台4に設け
ても同様の効果を得ることができる。また、レンズ取付
板5を薄板で形成し基台4を厚板で形成して説明したが
各部材の厚みは座グリを設けることでどのような厚みで
あっても同様の効果を得ることができる。
The lens mounting plate 5 may be made of a plate material having a thickness of one thread or less. However, it is better to provide the spot facing 5e while maintaining the strength of the lens mounting plate 5 with one or less female threads. This is desirable because a portion can be formed. Although the insertion hole 4c is provided in the base 4 and the female screw portion 5c is provided in the lens mounting plate 5,
The same effect can be obtained by providing an insertion hole in the lens mounting plate 5 and providing the female screw portion in the base 4. Further, although the lens mounting plate 5 is formed of a thin plate and the base 4 is formed of a thick plate, the same effect can be obtained regardless of the thickness of each member by providing the counterbore. it can.

【0033】[0033]

【発明の効果】請求項1の発明によると、簡単な構成で
対物レンズの姿勢調整量を大きくすることができ光ピッ
クアップの製造歩留まりを向上させることができる。
According to the first aspect of the present invention, the amount of adjustment of the attitude of the objective lens can be increased with a simple configuration, and the production yield of the optical pickup can be improved.

【0034】請求項2の発明によると、対物レンズの中
心が姿勢調整時に移動しないので姿勢調整作業が容易に
なり工数を削減することができる。
According to the second aspect of the present invention, since the center of the objective lens does not move at the time of the posture adjustment, the posture adjustment work becomes easy and the number of steps can be reduced.

【0035】請求項3または請求項4の発明によると、
雌ねじ部を形成する部材の強度を低下させることなく簡
単に1山以下の雌ねじ部を形成することができる。
According to the third or fourth aspect of the present invention,
One or less female threads can be easily formed without lowering the strength of the member forming the female threads.

【図面の簡単な説明】[Brief description of the drawings]

【図1】 従来の光ピックアップの構成を示す平面
図である。
FIG. 1 is a plan view showing a configuration of a conventional optical pickup.

【図2】 従来の光ピックアップの構成の詳細を示
す斜視図である。
FIG. 2 is a perspective view showing details of a configuration of a conventional optical pickup.

【図3】 従来の光ピックアップの姿勢調整機構部
を示す平面図である。
FIG. 3 is a plan view showing a posture adjustment mechanism of a conventional optical pickup.

【図4】 従来の光ピックアップの姿勢調整機構部
において姿勢調整状態を示す平面図である。
FIG. 4 is a plan view showing a posture adjustment state in a posture adjustment mechanism of a conventional optical pickup.

【図5】 従来の光ピックアップのレンズ取付板を
示す平面図である。
FIG. 5 is a plan view showing a lens mounting plate of a conventional optical pickup.

【図6】 本発明の光ピックアップのレンズ取付板
を示す平面図である。
FIG. 6 is a plan view showing a lens mounting plate of the optical pickup of the present invention.

【図7】 本発明の光ピックアップの姿勢調整機構
部において姿勢調整状態を示す平面図である。
FIG. 7 is a plan view showing a posture adjustment state in the posture adjustment mechanism of the optical pickup of the present invention.

【図8】 本発明の光ピックアップのレンズ取付板
の他の実施形態を示す平面図である。
FIG. 8 is a plan view showing another embodiment of the lens mounting plate of the optical pickup of the present invention.

【図9】 本発明の光ピックアップの姿勢調整機構
部の他の実施形態を示す平面図である。
FIG. 9 is a plan view showing another embodiment of the attitude adjustment mechanism of the optical pickup of the present invention.

【図10】 本発明の光ピックアップの姿勢調整機構
部の他の実施形態を示す平面図である。
FIG. 10 is a plan view showing another embodiment of the attitude adjustment mechanism of the optical pickup of the present invention.

【図11】 本発明の光ピックアップの姿勢調整機構
部の支点の構成方法を示す概略図である。
FIG. 11 is a schematic view illustrating a method of configuring a fulcrum of the attitude adjustment mechanism of the optical pickup according to the present invention.

【図12】 本発明の光ピックアップの姿勢調整機構
部の雌ねじ部の形状を説明する概略上面図である。
FIG. 12 is a schematic top view illustrating the shape of a female screw portion of the attitude adjustment mechanism of the optical pickup of the present invention.

【符号の説明】[Explanation of symbols]

1 レーザ光 2 対物レンズ 4 基台 4a 凹部 4c 挿通孔 5 レンズ取付板 5a 凸部 5c 雌ねじ部 5e 座グリ 8 ボルト 11、15 圧縮ばね 14 引っ張りばね 30 姿勢調整機構 B 支点 DESCRIPTION OF SYMBOLS 1 Laser beam 2 Objective lens 4 Base 4a Concave part 4c Insertion hole 5 Lens mounting plate 5a Convex part 5c Female screw part 5e Counterbore 8 Bolt 11, 15 Compression spring 14 Tension spring 30 Posture adjustment mechanism B Support point

Claims (4)

【特許請求の範囲】[Claims] 【請求項1】 対物レンズを保持する保持部材の所定部
分を基台に対し調整用ボルトを介して取り付ける光ピッ
クアップにおいて、前記調整用ボルトと噛合する前記保
持部材の雌ねじ部の厚みを該雌ねじ部に部分的にねじの
谷がないように薄くしたことを特徴とする光ピックアッ
プ。
1. An optical pickup in which a predetermined portion of a holding member for holding an objective lens is attached to a base via an adjusting bolt, wherein a thickness of a female screw portion of the holding member which meshes with the adjusting bolt is adjusted to a thickness of the female screw portion. An optical pickup characterized in that it is thinned so that there is no thread valley partially.
【請求項2】 前記基台と前記保持部材とはレーザ光が
通る貫通孔を有し、前記保持部材の前記貫通孔の周囲に
設けられた球面状の凸部と、前記基台の前記貫通孔の周
囲に設けられた球面状または前記凸部と接する部分が円
形の凹部とが当接して支点を構成し、前記凸部の球面の
中心と前記対物レンズの中心とが一致していることを特
徴とする請求項1に記載の光ピックアップ。
2. The base and the holding member each have a through hole through which laser light passes, and a spherical projection provided around the through hole of the holding member; A portion provided in contact with the spherical shape or the convex portion provided around the hole makes contact with the circular concave portion to form a fulcrum, and the center of the spherical surface of the convex portion coincides with the center of the objective lens. The optical pickup according to claim 1, wherein:
【請求項3】 前記雌ねじ部の厚みが座グリによって規
制されていることを特徴とする請求項1または請求項2
に記載の光ピックアップ。
3. The method according to claim 1, wherein a thickness of the female screw portion is regulated by a spot facing.
An optical pickup according to claim 1.
【請求項4】 前記座グリは皿状であることを特徴とす
る請求項3に記載の光ピックアップ。
4. The optical pickup according to claim 3, wherein the spot facing is dish-shaped.
JP3702298A 1998-02-19 1998-02-19 Optical pickup Pending JPH11232653A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP3702298A JPH11232653A (en) 1998-02-19 1998-02-19 Optical pickup

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP3702298A JPH11232653A (en) 1998-02-19 1998-02-19 Optical pickup

Publications (1)

Publication Number Publication Date
JPH11232653A true JPH11232653A (en) 1999-08-27

Family

ID=12486035

Family Applications (1)

Application Number Title Priority Date Filing Date
JP3702298A Pending JPH11232653A (en) 1998-02-19 1998-02-19 Optical pickup

Country Status (1)

Country Link
JP (1) JPH11232653A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002208174A (en) * 2001-01-09 2002-07-26 Fujitsu Ten Ltd Adjusting for optical pickup and adjusting equipment for optical pickup provided with the same
US7065775B2 (en) 2002-07-08 2006-06-20 Funai Electric Co., Ltd. Optical disc apparatus
US7116494B2 (en) 2003-11-27 2006-10-03 Sharp Kabushiki Kaisha Optical apparatus and method for adjusting amount of light of the same
WO2006120595A1 (en) * 2005-05-10 2006-11-16 Arima Devices Corporation An optical disc device with an optical pickup unit having an adjustable objective lens

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002208174A (en) * 2001-01-09 2002-07-26 Fujitsu Ten Ltd Adjusting for optical pickup and adjusting equipment for optical pickup provided with the same
US7065775B2 (en) 2002-07-08 2006-06-20 Funai Electric Co., Ltd. Optical disc apparatus
US7116494B2 (en) 2003-11-27 2006-10-03 Sharp Kabushiki Kaisha Optical apparatus and method for adjusting amount of light of the same
CN1294575C (en) * 2003-11-27 2007-01-10 夏普株式会社 Optical apparatus and method for adjusting amount of light of the same
WO2006120595A1 (en) * 2005-05-10 2006-11-16 Arima Devices Corporation An optical disc device with an optical pickup unit having an adjustable objective lens

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