JPH09274123A - Optical element fixing device - Google Patents
Optical element fixing deviceInfo
- Publication number
- JPH09274123A JPH09274123A JP8512196A JP8512196A JPH09274123A JP H09274123 A JPH09274123 A JP H09274123A JP 8512196 A JP8512196 A JP 8512196A JP 8512196 A JP8512196 A JP 8512196A JP H09274123 A JPH09274123 A JP H09274123A
- Authority
- JP
- Japan
- Prior art keywords
- optical element
- pedestal
- fixed
- adhesive
- optical
- 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.)
- Granted
Links
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、光ピックアップ内
などに設置されるビームスプリッタなどの光学素子の固
定装置に係り、特に温度変化などによる前記光学素子の
位置ずれや倒れが発生するのを防止できるようにした光
学素子の固定装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for fixing an optical element such as a beam splitter installed in an optical pickup or the like, and particularly prevents the optical element from being displaced or tilted due to a temperature change or the like. The invention relates to a fixing device for an optical element.
【０００２】[0002]
【従来の技術】図３は、光ピックアップの内部構造の概
要を示す構成図である。同図において、符号１はレーザ
ビーム（レーザ光）が照射可能なレーザダイオード、２
は光学素子、３は反射鏡、４は対物レンズ、５は光検出
器を示している。レーザダイオード１から照射されるレ
ーザ光は、光学素子２の側面（入射面）２ａに対し所定
の入射角で入射される。光学素子２としては、例えば入
射された光を反射光と透過光の２つに分割することがで
きるハーフミラーや偏光ビームスプリッタなどが用いら
れる。レーザ光は、その一部が光学素子の側面２ａで反
射され、反射鏡３の方向に向きが変えられる。反射鏡３
の上方には、対物レンズ４が設けられている。この対物
レンズ４にレーザ光を導くため、反射鏡３は所定の角度
に傾けられて光ピックアップ内に設置されている。対物
レンズ４の上方には、ＣＤやＤＶＤなどのディスク（図
示せず）が装填されている。対物レンズ４は、図示しな
いフォーカスサーボ機能などにより、反射鏡３で反射さ
れたレーザ光をディスクの信号記録面に対し集束して照
射できるようになっている。2. Description of the Related Art FIG. 3 is a block diagram showing the outline of the internal structure of an optical pickup. In the figure, reference numeral 1 is a laser diode capable of emitting a laser beam (laser light), 2
Is an optical element, 3 is a reflecting mirror, 4 is an objective lens, and 5 is a photodetector. The laser light emitted from the laser diode 1 is incident on the side surface (incident surface) 2a of the optical element 2 at a predetermined incident angle. As the optical element 2, for example, a half mirror or a polarization beam splitter capable of splitting incident light into two, that is, reflected light and transmitted light, is used. A part of the laser light is reflected by the side surface 2 a of the optical element, and the direction thereof is changed to the direction of the reflecting mirror 3. Reflector 3
The objective lens 4 is provided above. In order to guide the laser light to the objective lens 4, the reflecting mirror 3 is installed in the optical pickup while being tilted at a predetermined angle. A disc (not shown) such as a CD or a DVD is loaded above the objective lens 4. The objective lens 4 can focus and irradiate the laser light reflected by the reflecting mirror 3 onto the signal recording surface of the disk by a focus servo function (not shown).
【０００３】ディスクの信号記録面から反射された戻り
光は、上記と逆の経路をたどり光学素子２に導かれる。
光学素子２では、戻り光の一部が光学素子２を透過し、
その後方に設けられた光検出器５に導かれる。光検出器
５は、例えばピンフォトダイオードなどであり、戻り光
は、この光検出器５で検出され、各種の信号処理が行わ
れる。The return light reflected from the signal recording surface of the disc follows the opposite path to the above and is guided to the optical element 2.
In the optical element 2, a part of the returning light is transmitted through the optical element 2,
The light is guided to the photodetector 5 provided behind it. The photodetector 5 is, for example, a pin photodiode, and the returned light is detected by the photodetector 5 and various signal processing is performed.
【０００４】図４は、従来の光ピックアップの内部構造
の一部を示す拡大部分斜視図、図５は図４をＶ方向から
みた側面図である。図４に示すように、前記ハーフミラ
ーまたは偏光ビームスプリッタなどの光学素子２は、例
えばアルミニウム合金などでダイキャスト形成された台
座７内に位置決めされて固定される。台座７には、壁面
８、係止部９及び壁面１０などが一体に形成されてお
り、光学素子２はこれらの間の固定溝６内に装着され
る。壁面８及び係止部９には、壁面１０の方向（Ｘ
（＋）方向）に突出した凸部８ａおよび９ａが形成され
ており、この凸部８ａと９ａの表面が、光学素子２の位
置決めの基準面Ａとなっている。台座７の固定溝６の底
部にも凸部状の支持部１１ａ，１１ｂが突出して形成さ
れており、その上面が支持面Ｂとなって表面光学素子２
の底面が支持される。前記凸部８ａと９ａの表面の基準
面Ａと、支持部１１ａ，１１ｂの支持面Ｂは例えばフラ
イス盤などにより切削加工され、各基準面Ａと支持面Ｂ
とが平面となるように仕上げられている。FIG. 4 is an enlarged partial perspective view showing a part of the internal structure of a conventional optical pickup, and FIG. 5 is a side view of FIG. 4 viewed from the V direction. As shown in FIG. 4, the optical element 2 such as the half mirror or the polarization beam splitter is positioned and fixed in a pedestal 7 die-cast with an aluminum alloy, for example. A wall surface 8, a locking portion 9, a wall surface 10 and the like are integrally formed on the pedestal 7, and the optical element 2 is mounted in the fixed groove 6 between them. The direction of the wall surface 10 (X
Protrusions 8a and 9a protruding in the (+) direction are formed, and the surfaces of the protrusions 8a and 9a serve as a reference plane A for positioning the optical element 2. Protrusion-shaped supporting portions 11a and 11b are also formed so as to project from the bottom of the fixed groove 6 of the pedestal 7, and the upper surface thereof becomes the supporting surface B and the surface optical element 2
The bottom surface of is supported. The reference plane A on the surfaces of the protrusions 8a and 9a and the support plane B of the support sections 11a and 11b are cut by, for example, a milling machine, and the reference plane A and the support plane B are formed.
It is finished so that and are flat.
【０００５】図４において、レーザダイオード１は
（ア）、反射鏡３は（イ）、光検出器５は（ウ）の各方
向に設置されている。また、図４では示されていない
が、反射鏡３のＺ軸（＋）方向に対物レンズ４が位置す
る。（ア）の方向から照射されるレーザ光は、光学素子
２の側面２ａによって（イ）の方向にある反射鏡３に導
かれる。またディスクの信号記録面で反射された戻り光
は、反射鏡３により（イ）の方向から光学素子２に向か
って導かれ、その一部は光学素子２を透過して（ウ）の
方向に位置する光検出器に導かれる。In FIG. 4, the laser diode 1 is installed in each direction of (A), the reflecting mirror 3 is installed in (A), and the photodetector 5 is installed in each direction of (C). Although not shown in FIG. 4, the objective lens 4 is located in the Z-axis (+) direction of the reflecting mirror 3. The laser light emitted from the direction (a) is guided to the reflecting mirror 3 in the direction (a) by the side surface 2 a of the optical element 2. The return light reflected by the signal recording surface of the disc is guided by the reflecting mirror 3 from the direction (a) toward the optical element 2, and a part of the return light is transmitted through the optical element 2 in the direction (c). It is guided to the photodetector located.
【０００６】光学素子２が固定溝６内に固定される際、
図４に示すようなばね部材１２が用いられる。ばね部材
１２は、ばね性を有する金属板で形成されたものであ
り、本体１２ａ、板ばね１２ｂ，１２ｃ、天板１２ｄお
よび押圧部１２ｅの各部から構成される。図５に示すよ
うに、光学素子２は、固定溝６内で支持部１１ａ，１１
ｂの上に設置され、ばね部材１２の板ばね１２ｂ，１２
ｃが光学素子２の側面２ｂと壁面１０の間に収縮されて
介装される。光学素子２は、板ばね１２ｂ，１２ｃのＸ
軸（−）方向へ弾性押圧力ｆ1により押圧され、光の入
射面となっている側面２ａが前記基準面Ａに強固に押圧
される。また、ばね部材１２の天板１２ｄの弾性力によ
り、押圧部１２ｅが光学素子２の天井面を弾性的に強固
に押圧し、光学素子２の底面が支持部１１ａ，１１ｂの
表面の支持面に押し付けられる。このように光学素子２
は、各方向へ弾圧されることにより固定溝６内で固定さ
れる。When the optical element 2 is fixed in the fixing groove 6,
A spring member 12 as shown in FIG. 4 is used. The spring member 12 is formed of a metal plate having a spring property, and includes a main body 12a, leaf springs 12b and 12c, a top plate 12d, and a pressing portion 12e. As shown in FIG. 5, the optical element 2 has the support portions 11 a, 11 in the fixing groove 6.
The leaf springs 12b, 12 of the spring member 12 installed on the
c is contracted and interposed between the side surface 2b of the optical element 2 and the wall surface 10. The optical element 2 is the X of the leaf springs 12b and 12c.
It is pressed in the axial (-) direction by the elastic pressing force f1, and the side surface 2a, which is the light incident surface, is firmly pressed against the reference surface A. Further, due to the elastic force of the top plate 12d of the spring member 12, the pressing portion 12e elastically and firmly presses the ceiling surface of the optical element 2, and the bottom surface of the optical element 2 becomes the supporting surface of the supporting portions 11a and 11b. It is pressed. In this way, the optical element 2
Are fixed in the fixing groove 6 by being elastically pressed in each direction.
【０００７】[0007]
【発明が解決しようとする課題】この光ピックアップで
は、光学素子２の側面２ａが、レーザダイオード１から
の光の入射面で且つ対物レンズ４へ光束を与える反射面
となっている。したがって、光学素子２の側面２ａの傾
きは、ディスクからの信号の読取り動作などに影響を与
える。例えばレーザダイオード１が位置する（ア）の方
向や、対物レンズ４に向かう（イ）の方向に対して、側
面２ａの向きが高精度に決められていないと、対物レン
ズ４の光軸に対してレーザ光の光束の中心がずれて収差
が増大し、ディスクの信号記録面に形成されるレーザ光
のスポット形状に歪みなどが生じる。また、光学素子２
の位置ずれ，傾きが発生した場合、受光素子５に入射す
る光軸にずれが生じるため、対物レンズのフォーカスサ
ーボ動作にオフセットが発生するなどの問題が生じる。
したがって、前記凸部８ａと９ａの表面の基準面Ａが高
精度に切削加工され、光学素子２の側面２ａがこの基準
面Ａに押し付けられて側面２ａの向きが設定されるもの
となっている。In this optical pickup, the side surface 2a of the optical element 2 is an incident surface for the light from the laser diode 1 and a reflecting surface for giving a light beam to the objective lens 4. Therefore, the inclination of the side surface 2a of the optical element 2 affects the operation of reading a signal from the disc. For example, if the direction of the side surface 2a is not accurately determined with respect to the (a) direction in which the laser diode 1 is located and the (a) direction toward the objective lens 4, the optical axis of the objective lens 4 is As a result, the center of the light beam of the laser light is shifted, and the aberration is increased, so that the spot shape of the laser light formed on the signal recording surface of the disc is distorted. In addition, the optical element 2
When the position shift and the tilt occur, the optical axis incident on the light receiving element 5 shifts, which causes a problem such as an offset in the focus servo operation of the objective lens.
Therefore, the reference plane A on the surfaces of the convex portions 8a and 9a is cut with high precision, and the side surface 2a of the optical element 2 is pressed against the reference plane A to set the orientation of the side surface 2a. .
【０００８】しかしながら、図４と図５に示す従来の光
ピックアップでの光学素子２の固定装置では、環境温度
の変化が激しいと、基準面Ａで位置決めされているはず
の光学素子２の側面２ａに倒れなどが発生する問題が生
じる。However, in the conventional apparatus for fixing the optical element 2 in the optical pickup shown in FIGS. 4 and 5, when the environmental temperature changes drastically, the side surface 2a of the optical element 2 which is supposed to be positioned on the reference plane A is detected. There is a problem such as falling.
【０００９】その原因のひとつは、凸部８ａと９ａの表
面の基準面Ａの切削加工の工程上の問題が挙げられる。
前記基準面Ａは、凸部８ａと９ａのＺ軸方向の長さの全
域にて平面に加工されるべきであるが、切削加工では、
回転する加工工具が固定溝６の上方からＺ（−）方向へ
挿入され、工具の回転する外周面により凸部８ａと９ａ
の表面が切削される。このときの加工では、凸部８ａと
９ａの表面の上下端部分に図５に示す曲面（ｒ部）が形
成されることを避けるこができない。この曲面（ｒ部）
が形成されることにより、光学素子２の側面２ａを位置
決めする基準面ＡのＺ軸方向の長さが短くなり、基準面
Ａの位置決め面積Ｓが設計値よりも小さくなる。したが
って、図５に示すように、板ばね１２ｂ，１２ｃで基準
面Ａに押し付けられている光学素子２は姿勢が不安定に
なる。One of the causes is a problem in the process of cutting the reference plane A on the surfaces of the convex portions 8a and 9a.
The reference plane A should be processed into a flat surface over the entire length of the projections 8a and 9a in the Z-axis direction.
A rotating machining tool is inserted from above the fixed groove 6 in the Z (-) direction, and the protruding outer peripheral surface of the tool causes protrusions 8a and 9a to be formed.
The surface of is cut. In the processing at this time, it is inevitable that the curved surfaces (r portions) shown in FIG. 5 are formed on the upper and lower end portions of the surfaces of the convex portions 8a and 9a. This curved surface (r part)
By forming the, the length of the reference plane A for positioning the side surface 2a of the optical element 2 in the Z-axis direction becomes shorter, and the positioning area S of the reference plane A becomes smaller than the design value. Therefore, as shown in FIG. 5, the posture of the optical element 2 pressed against the reference plane A by the leaf springs 12b and 12c becomes unstable.
【００１０】さらに、他の原因としては、光学素子２を
形成しているガラスと、台座７の形成材料であるアルミ
ニウム合金などとの間に線膨張係数の差があることが挙
げられる。ガラスの線膨張係数は、１０×１０-6ｍ／°
Ｃ程度で、アルミニウムの線膨張係数は、２２×１０-6
ｍ／°Ｃ程度であり、アルミニウムはガラスの２倍であ
る。Further, another cause is that there is a difference in coefficient of linear expansion between the glass forming the optical element 2 and the aluminum alloy or the like forming the pedestal 7. The linear expansion coefficient of glass is 10 × 10 -6 m / °
The linear expansion coefficient of aluminum is about 22 × 10 -6 at C level.
m / ° C and aluminum is twice as much as glass.
【００１１】したがって、光ピックアップがきわめて気
温の低い地域、または高温の地域で使用されると、光学
素子２の収縮量または膨張量に対して、台座７の収縮量
または膨張量の方が大きくなる。図４と図５に示すもの
では、光学素子２の天井面が天板１２ｄの弾性力により
Ｚ（−）方向へ強く押されており、光学素子２の底面
と、支持部１１ａ，１１ｂの上面の支持面Ｂとが強い力
で互いに圧接されている。また、光学素子２の側面２ａ
は反射面であるために鏡面仕上げされているのに対し、
その底面は単なるカット面、いわゆる砂面であり、側面
２ａよりも摩擦係数が極めて大きくなっている。したが
って、光学素子２と台座７との前記収縮量または膨張量
の差により、固定溝６の底部が図５にて矢印（エ）で示
すように、光学素子２に対して相対的に動くと、支持面
Ｂに押し付けられている光学素子２の底面がこれに引き
ずられて（エ）方向へ動き、その結果、底面と支持部１
１ａ，１１ｂの支持面Ｂとの接触部を支点として光学素
子２がα方向またはβ方向へわずかに回動し、その回動
状態で安定してしまう。特に基準面Ａの上下の曲面（ｒ
部）の領域が広いものでは、基準面Ａと光学素子２の側
面２ａとの当接が不安定であり、前記α方向とβ方向へ
の回転が生じやすい。Therefore, when the optical pickup is used in an extremely low temperature region or a high temperature region, the contraction amount or expansion amount of the pedestal 7 becomes larger than the contraction amount or expansion amount of the optical element 2. . In FIGS. 4 and 5, the ceiling surface of the optical element 2 is strongly pressed in the Z (−) direction by the elastic force of the top plate 12d, and the bottom surface of the optical element 2 and the upper surfaces of the support portions 11a and 11b. And the supporting surface B thereof are pressed against each other with a strong force. In addition, the side surface 2a of the optical element 2
Is a reflective surface, so it is mirror-finished,
The bottom surface is a mere cut surface, that is, a so-called sand surface, and the coefficient of friction is extremely larger than that of the side surface 2a. Therefore, when the bottom of the fixing groove 6 moves relative to the optical element 2 as indicated by an arrow (d) in FIG. 5, due to the difference in the contraction amount or the expansion amount between the optical element 2 and the pedestal 7. , The bottom surface of the optical element 2 pressed against the support surface B is dragged by this and moves in the (d) direction, and as a result, the bottom surface and the support portion 1
The optical element 2 slightly rotates in the α direction or the β direction with the contact portion of the 1a and 11b with the support surface B as a fulcrum, and becomes stable in the rotated state. In particular, curved surfaces (r
If the area of the (part) is wide, the contact between the reference surface A and the side surface 2a of the optical element 2 is unstable, and rotation in the α direction and the β direction is likely to occur.
【００１２】光学素子２が前記α方向またはβ方向へ回
転し、そのまま安定してしまうと、図４に示す（ア）方
向および（イ）方向に対する光学素子２の側面２ａの対
向角度にずれが発生し、前記のように信号記録面での光
スポットの歪みや、トラッキングサーボのオフセットな
どが発生することになる。If the optical element 2 rotates in the α direction or β direction and becomes stable as it is, the facing angle of the side surface 2a of the optical element 2 with respect to the (A) direction and the (A) direction shown in FIG. As a result, the distortion of the light spot on the signal recording surface, the offset of the tracking servo, etc. occur.
【００１３】本発明は上記従来の課題を解決するもので
あり、固定部側において光学素子が高精度に位置決めさ
れるとともに強固に保持され、しかも光学素子と固定部
側との線膨張係数の相違により温度変化での収縮量や膨
張量に差が生じても、光学素子の位置決めに狂いが生じ
にくいようにした光学素子の固定装置を提供することを
目的としている。The present invention is to solve the above-mentioned conventional problems. The optical element is positioned with high precision and firmly held on the fixed portion side, and the difference in linear expansion coefficient between the optical element and the fixed portion side. Therefore, an object of the present invention is to provide a fixing device for an optical element in which the positioning of the optical element is less likely to be misaligned even if the amount of contraction or the amount of expansion changes due to temperature change.
【００１４】[0014]
【課題を解決するための手段】本発明は、光の入射また
は出射面が側面となっている光学素子を固定部に対して
固定する装置において、固定部側に前記側面を複数箇所
にて受ける基準面と、前記側面を各基準面に押し付ける
弾圧部材とが設けられ、前記複数箇所の基準面の一部の
みと光学素子の前記側面とが接着固定されていることを
特徴とするものである。SUMMARY OF THE INVENTION The present invention is an apparatus for fixing an optical element having a side surface on which light enters or exits to a fixed portion, and the side surface is received at a plurality of points on the fixed portion side. A reference surface and an elastic member that presses the side surface against each reference surface are provided, and only a part of the reference surfaces at the plurality of locations and the side surface of the optical element are adhesively fixed. .
【００１５】また上記において、光学素子を、上下方向
から押え付ける部材が設けられておらず、前記一部の基
準面との接着力のみで光学素子が上下方向へ動くことの
ないように固定されていることが好ましい。Further, in the above description, a member for pressing the optical element from the vertical direction is not provided, and the optical element is fixed so as not to move in the vertical direction only by the adhesive force with the part of the reference surface. Preferably.
【００１６】さらに、固定部側に設けられて光学素子の
底面が対向する支持部と、光学素子の前記底面との間
に、隙間が形成されていることが好ましい。Further, it is preferable that a gap be formed between the support portion provided on the fixed portion side and facing the bottom surface of the optical element, and the bottom surface of the optical element.
【００１７】本発明では、例えば光ピックアップに設け
られるハーフミラーや偏光ビームスプリッタなどのよう
に、入射面や出射面さらには反射面となる側面を有する
光学素子が用いられ、この光学素子は前記側面が、固定
部側に設けられた複数箇所の基準面に対し板ばねやコイ
ルばねなどの弾圧部材により弾圧され、前記側面が一定
の向きで位置決めされる。In the present invention, an optical element having a side surface serving as an entrance surface, an exit surface, and a reflection surface, such as a half mirror or a polarization beam splitter provided in an optical pickup, is used. Is elastically pressed against a plurality of reference surfaces provided on the fixed portion side by elastic members such as leaf springs and coil springs, and the side surfaces are positioned in a fixed direction.
【００１８】そして、前記複数箇所の基準面のうちの一
部、すなわち複数の基準面のいずれかと側面とが接着剤
により固定されている。光学素子の側面と基準面とが接
着固定されているため、例えば図２に示すように加工作
業において基準面Ａの上下部分に曲面（ｒ部）が形成さ
れて、実質的な基準面の面積Ｓが狭くても、この基準面
と光学素子の側面とを確実に固定できる。したがって、
温度変化により、光学素子と、これを支持する固定部側
との収縮量や膨張量に差があっても、光学素子が傾くな
どの問題が生じにくい。Then, a part of the plurality of reference surfaces, that is, any one of the plurality of reference surfaces and the side surface are fixed by an adhesive. Since the side surface of the optical element and the reference surface are adhered and fixed, curved surfaces (r portions) are formed in the upper and lower portions of the reference surface A in the working operation, as shown in FIG. Even if S is narrow, the reference surface and the side surface of the optical element can be reliably fixed. Therefore,
Even if there is a difference in the amount of contraction or expansion between the optical element and the side of the fixing portion that supports the optical element due to temperature change, problems such as tilting of the optical element are unlikely to occur.
【００１９】また、複数箇所の基準面のうちの一部のみ
に光学素子の側面が接着固定され、他の基準面に対して
は光学素子の側面が弾圧部材で押し付けられているのみ
であるため、光学素子と固定部側との間に収縮量や膨張
量の差があっても、接着剤の剥がれや接着力の低下が生
じにくい。例えば複数箇所の基準面の全てが光学素子の
側面に接着固定されているものでは、前記収縮量や膨張
量の差により各基準面の接着剤層にせん断応力が作用
し、接着剤層の剥がれによる接着力の低下が生じやす
い。しかし、本発明では、一部の基準面のみが光学素子
に接着されているため、前記のように接着剤層に応力が
作用することがなく、接着剤の剥がれなどが生じにくく
なる。Further, the side surface of the optical element is adhered and fixed only to a part of the plurality of reference surfaces, and the side surface of the optical element is merely pressed against the other reference surface by the elastic member. Even if there is a difference in the amount of contraction or the amount of expansion between the optical element and the fixed portion side, the peeling of the adhesive or the decrease in the adhesive force is unlikely to occur. For example, in the case where all of the reference planes at a plurality of locations are adhesively fixed to the side surface of the optical element, shear stress acts on the adhesive layer of each reference plane due to the difference in the shrinkage amount or expansion amount, and the adhesive layer peels off. The adhesive strength is likely to decrease due to. However, in the present invention, since only a part of the reference surface is adhered to the optical element, stress does not act on the adhesive layer as described above, and peeling of the adhesive is less likely to occur.
【００２０】さらに、光学素子は前記接着力のみで上下
方向に動かないように固定され、その他に上下方向に動
かないように弾圧する部材を設けない構造にでき、よっ
て固定部側と光学素子とで収縮量や膨張量の差が生じて
も、図５に示す従来例のように、固定部側の支持部の収
縮や膨張時の変形により、光学素子の底部が引きずられ
てこの光学素子が傾くなどの現象が生じにくい。さら
に、光学素子の底面と支持部との間に隙間を形成してお
くことにより、支持部の収縮や膨張による移動によって
光学素子の底面に力が与えられることがなく、光学素子
に前記傾きなどがさらに発生しにくい。Further, the optical element can be fixed so as not to move in the vertical direction only by the adhesive force, and no member for elastically pressing so as not to move in the vertical direction can be provided, so that the fixing portion side and the optical element are Even if there is a difference in the amount of contraction or expansion, the bottom of the optical element is dragged due to the deformation of the support portion on the fixed portion side during contraction or expansion, as in the conventional example shown in FIG. Phenomena such as tilting do not occur easily. Further, by forming a gap between the bottom surface of the optical element and the supporting portion, the movement of the supporting portion due to contraction or expansion does not give a force to the bottom surface of the optical element, and the inclination of the optical element is Is less likely to occur.
【００２１】[0021]
【発明の実施の形態】以下、本発明について図面を参照
して説明する。図１は、光ピックアップでの光学素子の
固定装置の構造を示す斜視図、図２は図１のＩＩ−ＩＩ
線の断面図である。図１に示す光ピックアップＰでは、
例えばアルミニウム合金などでダイキャスト成形された
台座２７を固定部側として各種の部品が搭載されてい
る。ハーフミラーまたは偏光ビームスプリッタである光
学素子２２は、台座に形成された壁面２８及び係止部２
９と、壁面２０との間の固定溝２６内に収納されてい
る。壁面２８及び係止部２９には、Ｘ軸（＋）方向に突
出した凸部２８ａ，２９ａが一体に形成され、各凸部２
８ａと２９ａの先端面が、前記光学素子２２の側面２２
ａの位置決め基準となる基準面Ａとなっている。DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings. FIG. 1 is a perspective view showing the structure of a fixing device for an optical element in an optical pickup, and FIG. 2 is a line II-II in FIG.
It is sectional drawing of a line. In the optical pickup P shown in FIG. 1,
For example, various parts are mounted with the pedestal 27 die-cast with an aluminum alloy or the like as the fixed portion side. The optical element 22, which is a half mirror or a polarization beam splitter, includes a wall surface 28 formed on the pedestal and the locking portion 2.
9 and the wall surface 20 are housed in a fixed groove 26. The wall surface 28 and the locking portion 29 are integrally formed with protrusions 28a and 29a protruding in the X-axis (+) direction.
The tip surfaces of 8a and 29a are the side surfaces 22 of the optical element 22.
It is a reference plane A that serves as a positioning reference for a.
【００２２】固定溝２６の底面には、Ｚ軸（＋）方向に
突出した支持部３１ａ，３１ｂが一体に形成され、その
上面が支持面Ｂとなっている。光学素子２２の側面２２
ａは、図４に示した光学素子２の側面２ａと同じであ
り、レーザダイオード１からのレーザ光が（ア）方向か
ら壁面２８に設けられた孔（図示せず）を通過して入射
する入射面であり、且つレーザ光を（イ）方向へ反射す
る反射面である。さらに対物レンズ４からの戻り光を
（ウ）方向へ透過させる透過面である。Supporting portions 31a and 31b projecting in the Z-axis (+) direction are integrally formed on the bottom surface of the fixed groove 26, and the upper surface thereof is a supporting surface B. Side surface 22 of optical element 22
a is the same as the side surface 2a of the optical element 2 shown in FIG. 4, and the laser light from the laser diode 1 is incident from the (A) direction through a hole (not shown) provided in the wall surface 28. It is an incident surface and a reflecting surface that reflects the laser light in the (a) direction. Further, it is a transmission surface that transmits the return light from the objective lens 4 in the (c) direction.
【００２３】光学素子２２は前記側面２２ａの一部が凸
部２８ａ，２９ａの表面の基準面Ａに当てられた状態で
装着される。光学素子２２の反対側の側面２２ｂと壁面
２０との間にはばね部材３２が取り付けられる。ばね部
材３２は金属ばね材料により形成されたものであり、本
体３２ａと、板ばね３２ｂ，３２ｃの各部から構成され
ている。板ばね３２ｂ，３２ｃは金属ばね材料が折曲げ
形成されたものであり、光学素子２２の前記側面２２ｂ
と壁面２０との隙間内に圧入状態で介装され、板ばね３
２ｂと３２ｃは各基準面Ａとほぼ対向する位置にそれぞ
れ配置される。そして板ばね３２ｂと３２ｃの弾性押圧
力Ｆ１（図２参照）により、光学素子２２の側面２２ａ
が各基準面Ａに押し付けられて位置決めされる。The optical element 22 is mounted in a state where a part of the side surface 22a is in contact with the reference plane A of the surfaces of the convex portions 28a and 29a. A spring member 32 is attached between the side surface 22b on the opposite side of the optical element 22 and the wall surface 20. The spring member 32 is formed of a metal spring material, and includes a main body 32a and leaf springs 32b and 32c. The leaf springs 32b and 32c are formed by bending a metal spring material, and are formed on the side surface 22b of the optical element 22.
Is inserted into the gap between the wall surface 20 and the wall 20 in a press-fitted state, and the leaf spring 3
2b and 32c are arranged at positions substantially facing the reference planes A, respectively. The elastic pressing force F1 of the leaf springs 32b and 32c (see FIG. 2) causes the side surface 22a of the optical element 22 to move.
Are pressed against each reference plane A and positioned.
【００２４】なお、図２に示すように、光学素子２２の
底面２２ｃと、支持部３１ａ，３１ｂの上面の支持面Ｂ
との間には、きわめてわずかな隙間ｄが形成されてい
る。この隙間を形成するためには、光学素子２２を取り
付けるための治具（例えば、台座２７の底面に設けられ
た孔から固定溝２６内に所定長さだけ突出するもの）を
用いてもよいし、または光学素子２２の底面２２ｃと支
持面Ｂとの間に薄いシートを介在させ、光学素子２２を
設置した時点でシートを抜き取るようにしてもよい。支
持部３１ａ，３１ｂは実質的に光学素子２２と接触しな
いため、固定溝２６の底面から突出させて設ける必要は
ないが、本実施例では基準面Ａを切削加工する際に工具
を当てる基準面としてこの支持部３１ａ，３１ｂの支持
面Ｂが利用されるものである。また前記ばね部材３２に
は、図４と図５に示したような光学素子を上方から弾圧
する弾圧部材が設けられていない。As shown in FIG. 2, the bottom surface 22c of the optical element 22 and the supporting surface B on the upper surfaces of the supporting portions 31a and 31b.
An extremely slight gap d is formed between the and. In order to form this gap, a jig for mounting the optical element 22 (for example, a jig protruding from the hole provided on the bottom surface of the pedestal 27 into the fixing groove 26 by a predetermined length) may be used. Alternatively, a thin sheet may be interposed between the bottom surface 22c of the optical element 22 and the support surface B, and the sheet may be pulled out when the optical element 22 is installed. Since the support portions 31a and 31b do not substantially contact the optical element 22, it is not necessary to provide the support portions 31a and 31b so as to project from the bottom surface of the fixed groove 26. However, in the present embodiment, the reference surface to which a tool is applied when cutting the reference surface A is used. The supporting surface B of the supporting portions 31a and 31b is used as. Further, the spring member 32 is not provided with an elastic member for elastically pressing the optical element from above as shown in FIGS. 4 and 5.
【００２５】図２に示すように、壁面２８の凸部２８ａ
の表面の基準面Ａと、光学素子２２の側面２２ａとが接
着剤３３により固定されている。ただし、光学素子２２
の側面２２ａと当接する他方の凸部２９ａの基準面Ａに
は接着剤は塗布されておらず、光学素子２２の側面２２
ａと凸部２９ａの基準面Ａとは板ばね３２ｂの弾性押圧
力Ｆ１により押圧されているのみである。なお前記接着
剤３３としては、紫外線硬化性の接着剤または嫌気性の
接着剤が使用される。組立作業としては、凸部２８ａの
表面の基準面Ａに接着剤３３を塗布し、固定溝２６内に
光学素子２２を装着した後、ばね部材３２の板ばね３２
ｂ，３２ｃが光学素子２２の側面２２ｂと壁面２０の間
に介装される。そして、板ばね３２ｂ，３２ｃにより光
学素子２２が凸部２８ａと２９ａの基準面Ａに押し付け
られた状態で、前記接着剤の硬化により、光学素子２２
が接着固定される。また、接着剤の硬化前に光学素子２
２の位置、あるいは傾きの微調整を行うようにしてもよ
い。As shown in FIG. 2, the convex portion 28a of the wall surface 28 is formed.
The reference surface A of the surface of the optical element 22 and the side surface 22a of the optical element 22 are fixed by the adhesive 33. However, the optical element 22
No adhesive is applied to the reference surface A of the other convex portion 29a that abuts the side surface 22a of the optical element 22.
The a and the reference surface A of the convex portion 29a are only pressed by the elastic pressing force F1 of the leaf spring 32b. As the adhesive 33, an ultraviolet curable adhesive or an anaerobic adhesive is used. As the assembling work, the adhesive 33 is applied to the reference surface A on the surface of the convex portion 28 a, the optical element 22 is mounted in the fixing groove 26, and then the leaf spring 32 of the spring member 32 is mounted.
b and 32c are interposed between the side surface 22b of the optical element 22 and the wall surface 20. Then, the optical element 22 is pressed by the leaf springs 32b and 32c against the reference surface A of the convex portions 28a and 29a, and the optical element 22 is cured by curing the adhesive.
Is fixedly adhered. In addition, before the adhesive is cured, the optical element 2
The position 2 or the inclination may be finely adjusted.
【００２６】前述のように、凸部２８ａと２９ａの基準
面Ａを切削加工する際に、基準面Ａの上下に曲面（ｒ
部）が形成されるのを避けることができず、基準面Ａの
実質的な面積Ｓが狭くなるが、本実施例のものでは凸部
２８ａと光学素子２２の側面２２ａとが接着剤３３で固
定されているため、凸部２８ａの基準面Ａと光学素子２
２の側面２２ａとの相対位置が簡単に動くことはなく、
板ばね３２ｂ，３２ｃの弾性押圧力と前記接着力とで光
学素子２２が強固に固定される。なお、前記曲面（ｒ
部）に接着剤３３を溜めることができるため、この接着
剤の溜りにより、凸部２８ａの基準面Ａと光学素子２２
の側面２２ａとの接着強度が高くなる。As described above, when cutting the reference plane A of the convex portions 28a and 29a, curved surfaces (r
Inevitably, the substantial area S of the reference plane A is narrowed, but in the present embodiment, the convex portion 28a and the side surface 22a of the optical element 22 are formed by the adhesive 33. Since it is fixed, the reference surface A of the convex portion 28a and the optical element 2
The relative position of the second side surface 22a does not move easily,
The optical element 22 is firmly fixed by the elastic pressing force of the leaf springs 32b and 32c and the adhesive force. The curved surface (r
Since the adhesive 33 can be stored in the area), the storage of the adhesive causes the reference surface A of the convex portion 28a and the optical element 22
The adhesive strength to the side surface 22a of the
【００２７】この固定装置では、光学素子２２の側面２
２ａが凸部２８ａの基準面Ａに接着剤３３により強固に
接着固定されている。したがって、図２に示す位置決め
状態で、光学素子２２が傾くようなことがない。したが
って、光学素子２２を上方から押える押圧部材を設ける
必要がなくなり、また光学素子２２の底面２２ｃと支持
部３１ａ，３１ｂの支持面Ｂとの間に隙間が形成されて
いるため、光学素子２２の材料であるガラスと固定部側
である台座２７の材料であるアルミニウム合金との線膨
張係数の相違により、低温環境または高温環境下におい
て、光学素子２２に対して固定溝２６の底部が相対的に
矢印（エ）方向へ移動しても、この移動力が光学素子２
２に作用しない。よって、温度環境変化によって、光学
素子２２が図５に示した従来例のようにα方向やβ方向
に傾くことがない。そのため、光の入射面および反射面
となる側面２２ａの向きを高精度に設定でき、この側面
２２ａの向きが変化し、ディスクの信号記録面でのスポ
ットの歪みが生じるなどの問題がない。In this fixing device, the side surface 2 of the optical element 22 is used.
2a is firmly adhered and fixed to the reference surface A of the convex portion 28a by the adhesive 33. Therefore, the optical element 22 does not tilt in the positioning state shown in FIG. Therefore, it is not necessary to provide a pressing member that presses the optical element 22 from above, and a gap is formed between the bottom surface 22c of the optical element 22 and the supporting surfaces B of the supporting portions 31a and 31b. In the low temperature environment or the high temperature environment, the bottom portion of the fixing groove 26 is relatively positioned with respect to the optical element 22 due to the difference in the linear expansion coefficient between the glass that is the material and the aluminum alloy that is the material of the pedestal 27 that is the fixing portion side. Even if the optical element 2 moves in the direction of the arrow (d),
2 does not work. Therefore, the optical element 22 does not tilt in the α direction or the β direction due to the change in the temperature environment unlike the conventional example shown in FIG. Therefore, the direction of the side surface 22a serving as the light incident surface and the light reflection surface can be set with high accuracy, and the direction of the side surface 22a changes, so that there is no problem such as distortion of the spot on the signal recording surface of the disc.
【００２８】また、複数箇所の基準面Ａのうちの凸部２
８ａの基準面Ａのみが光学素子２２に接着固定されてい
るため、光学素子２２と台座２７の線膨張係数の差によ
り、凸部２８ａと２９ａの間隔が光学素子２２に対して
変化しても、凸部２８ａと光学素子２２との間の接着剤
層にせん断力が作用しにくく、よって接着剤３３の接着
強度を常に高く維持できる。In addition, the convex portions 2 of the reference plane A at a plurality of locations
Since only the reference surface A of 8a is adhesively fixed to the optical element 22, even if the distance between the convex portions 28a and 29a changes with respect to the optical element 22 due to the difference in the linear expansion coefficient between the optical element 22 and the pedestal 27. The shearing force is unlikely to act on the adhesive layer between the convex portion 28a and the optical element 22, so that the adhesive strength of the adhesive 33 can always be kept high.
【００２９】なお、上記構成例では、基準面Ａが２箇所
であるが、この基準面Ａが３箇所またはそれ以上であっ
てもよい。この場合に接着される基準面は１箇所または
互いに近接する２箇所など、光学素子の形状などに合わ
せて任意に組み合せることができる。また光学素子はハ
ーフミラーや偏光ビームスプリッタに限られず、回折格
子、フレネルレンズなどであってもよい。Although the reference plane A is provided at two locations in the above configuration example, the reference plane A may be provided at three locations or more. In this case, the reference surfaces to be bonded can be arbitrarily combined with one another or two adjacent ones depending on the shape of the optical element. The optical element is not limited to the half mirror or the polarization beam splitter, and may be a diffraction grating, a Fresnel lens, or the like.
【００３０】[0030]
【発明の効果】以上詳述した本発明によれば、例えば光
ピックアップが搭載されている車内の温度に変化が起こ
った場合においても、光学素子に位置ずれを生じさせる
ことなく所定の基準面に対し高い精度で固定することが
できる。よって、光ピックアップ内に形成される光路の
精度を高く維持することができる。According to the present invention described in detail above, even when the temperature inside the vehicle in which the optical pickup is mounted changes, for example, a predetermined reference plane can be obtained without causing displacement of the optical element. It can be fixed with high accuracy. Therefore, the accuracy of the optical path formed in the optical pickup can be maintained high.
【図１】本発明における一構成例を示す光ピックアップ
での光学素子の固定装置を示す部分拡大斜視図、FIG. 1 is a partially enlarged perspective view showing a fixing device of an optical element in an optical pickup showing one configuration example of the present invention,
【図２】図１におけるＩＩ−ＩＩ線の断面図、2 is a sectional view taken along line II-II in FIG.
【図３】光ピックアップの内部構造の概要を示す構成
図、FIG. 3 is a configuration diagram showing an outline of an internal structure of an optical pickup,
【図４】従来の光ピックアップでの光学素子の固定装置
を示す拡大部分斜視図、FIG. 4 is an enlarged partial perspective view showing a fixing device for an optical element in a conventional optical pickup,
【図５】図４をＶ方向からみた側面図、5 is a side view of FIG. 4 viewed from the V direction,
２０，２８ 壁面 ２２ 光学素子 ２２ａ 入射面および反射面となる側面 ２２ｂ 反対側の側面 ２６ 固定溝 ２７ 台座 ２９ 係止部 ２８ａ，２９ａ 凸部 ３１ａ，３１ｂ 支持部 ３２ ばね部材 ３２ａ 本体 ３２ｂ，３２ｃ 板ばね ３３ 接着剤 Ｐ 光ピックアップ Ａ 基準面 Ｂ 支持面 20, 28 Wall surface 22 Optical element 22a Side surface 22b serving as incident surface and reflection surface 22b Opposite side surface 26 Fixing groove 27 Pedestal 29 Locking portion 28a, 29a Convex portion 31a, 31b Support portion 32 Spring member 32a Main body 32b, 32c Leaf spring 33 Adhesive P Optical pickup A Reference surface B Support surface
Claims (3)
る光学素子を固定部に対して固定する装置において、固
定部側に前記側面を複数箇所にて受ける基準面と、前記
側面を各基準面に押し付ける弾圧部材とが設けられ、前
記複数箇所の基準面の一部のみと光学素子の前記側面と
が接着固定されていることを特徴とする光学素子の固定
装置。1. An apparatus for fixing an optical element having a side surface on which light enters or exits to a fixed portion, wherein each of the reference surface and the side surface receives the side surface at a plurality of positions on the fixed portion side. An optical element fixing device comprising: an elastic member that is pressed against a reference surface, and only a part of the reference surfaces at the plurality of locations and the side surface of the optical element are adhesively fixed.
材が設けられておらず、前記一部の基準面との接着力の
みで光学素子が上下方向へ動くことのないように固定さ
れている請求項１記載の光学素子の固定装置。2. A member for pressing the optical element from the vertical direction is not provided, and the optical element is fixed so as not to move in the vertical direction only by the adhesive force with the part of the reference surface. An optical element fixing device according to claim 1.
対向する支持部と、光学素子の前記底面との間に、隙間
が形成されている請求項１または２記載の光学素子の固
定装置。3. The fixing of the optical element according to claim 1, wherein a gap is formed between a support portion provided on the fixing portion side and a bottom surface of the optical element faces, and the bottom surface of the optical element. apparatus.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP08512196A JP3426081B2 (en) | 1996-04-08 | 1996-04-08 | Optical element fixing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP08512196A JP3426081B2 (en) | 1996-04-08 | 1996-04-08 | Optical element fixing device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH09274123A true JPH09274123A (en) | 1997-10-21 |
| JP3426081B2 JP3426081B2 (en) | 2003-07-14 |
Family
ID=13849808
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP08512196A Expired - Fee Related JP3426081B2 (en) | 1996-04-08 | 1996-04-08 | Optical element fixing device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3426081B2 (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2002035538A1 (en) * | 2000-10-27 | 2002-05-02 | Thomson Licensing S.A. | Fastening element |
| FR2822251A1 (en) * | 2001-03-16 | 2002-09-20 | Zeiss Carl Jena Gmbh | ARRANGEMENT FOR THE POSITION FIXING OF AN OPTICAL COMPONENT |
| JP2006251517A (en) * | 2005-03-11 | 2006-09-21 | Ricoh Printing Systems Ltd | Optical scanner |
| JP2008084364A (en) * | 2006-09-26 | 2008-04-10 | Funai Electric Co Ltd | Optical pickup and assembling method thereof |
| JP2008102369A (en) * | 2006-10-19 | 2008-05-01 | Sanyo Electric Co Ltd | Optical panel mounting mechanism and projection image display using the same |
| DE102011052793A1 (en) * | 2011-08-18 | 2013-02-21 | Sick Ag | optics carrier |
| JP2014075167A (en) * | 2012-10-05 | 2014-04-24 | Hitachi Media Electoronics Co Ltd | Optical pickup |
| DE102015104212A1 (en) * | 2015-03-20 | 2016-09-22 | Valeo Schalter Und Sensoren Gmbh | Lens device for an optoelectronic sensor of a motor vehicle with fastening device, optoelectronic sensor, motor vehicle and method |
-
1996
- 1996-04-08 JP JP08512196A patent/JP3426081B2/en not_active Expired - Fee Related
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2002035538A1 (en) * | 2000-10-27 | 2002-05-02 | Thomson Licensing S.A. | Fastening element |
| FR2822251A1 (en) * | 2001-03-16 | 2002-09-20 | Zeiss Carl Jena Gmbh | ARRANGEMENT FOR THE POSITION FIXING OF AN OPTICAL COMPONENT |
| GB2374383A (en) * | 2001-03-16 | 2002-10-16 | Zeiss Carl Jena Gmbh | Arrangement for fixing in position an optical component |
| GB2374383B (en) * | 2001-03-16 | 2004-11-17 | Zeiss Carl Jena Gmbh | Arrangement for fixing in position an optical component |
| JP4533195B2 (en) * | 2005-03-11 | 2010-09-01 | 株式会社リコー | Optical scanning device |
| JP2006251517A (en) * | 2005-03-11 | 2006-09-21 | Ricoh Printing Systems Ltd | Optical scanner |
| JP2008084364A (en) * | 2006-09-26 | 2008-04-10 | Funai Electric Co Ltd | Optical pickup and assembling method thereof |
| JP2008102369A (en) * | 2006-10-19 | 2008-05-01 | Sanyo Electric Co Ltd | Optical panel mounting mechanism and projection image display using the same |
| DE102011052793A1 (en) * | 2011-08-18 | 2013-02-21 | Sick Ag | optics carrier |
| DE102011052793B4 (en) * | 2011-08-18 | 2013-11-07 | Sick Ag | optics carrier |
| JP2014075167A (en) * | 2012-10-05 | 2014-04-24 | Hitachi Media Electoronics Co Ltd | Optical pickup |
| DE102015104212A1 (en) * | 2015-03-20 | 2016-09-22 | Valeo Schalter Und Sensoren Gmbh | Lens device for an optoelectronic sensor of a motor vehicle with fastening device, optoelectronic sensor, motor vehicle and method |
| US10768306B2 (en) | 2015-03-20 | 2020-09-08 | Valeo Schalter Und Sensoren Gmbh | Lens device for an optoelectronic sensor of a motor vehicle comprising a securing unit, optoelectronic sensor, motor vehicle and method |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3426081B2 (en) | 2003-07-14 |
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