JP4134177B2 - Optical pickup device - Google Patents

Optical pickup device Download PDF

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JP4134177B2
JP4134177B2 JP2006002492A JP2006002492A JP4134177B2 JP 4134177 B2 JP4134177 B2 JP 4134177B2 JP 2006002492 A JP2006002492 A JP 2006002492A JP 2006002492 A JP2006002492 A JP 2006002492A JP 4134177 B2 JP4134177 B2 JP 4134177B2
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adhesive
gap
grating
mounting hole
pickup device
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JP2007184058A (en
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義一 杉本
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Funai Electric Co Ltd
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Funai Electric Co Ltd
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Description

本発明は、光ディスク記録・再生装置等に搭載される光ピックアップ装置に関し、特に、グレーティングの接着強度を高めるように改善した光ピックアップ装置に関する。   The present invention relates to an optical pickup device mounted on an optical disc recording / reproducing device or the like, and more particularly to an optical pickup device improved to increase the adhesive strength of a grating.

光ディスク記録・再生装置等に搭載される光ピックアップ装置は、スライドベースにレーザーダイオード、グレーティング、ビームスプリッター、立上げミラー(プリズムミラー)、対物レンズ、光検出器などをスライドベースに装着したもので、レーザーダイオードから発せられたレーザービームを、グレーティングとビームスプリッターにより3ビームに回折し、立上げミラーで上方に反射させて対物レンズで集光させながら光ディスクの記録面に照射し、その反射光束を光検出器で検出することにより、記録・再生が行われる。   An optical pickup device mounted on an optical disk recording / reproducing device is a slide base with a laser diode, a grating, a beam splitter, a rising mirror (prism mirror), an objective lens, a photodetector, etc. mounted on the slide base. A laser beam emitted from a laser diode is diffracted into three beams by a grating and a beam splitter, reflected upward by a rising mirror, and focused on an objective lens while irradiating the recording surface of the optical disk. Recording / reproducing is performed by detecting with a detector.

このような光ピックアップ装置では、グレーティングなどの光学部品の固定が不十分であると、光学部品の振動による位相差のずれなどが大きくなって記録・再生性能の低下を招く恐れがある。また、光学部品の軸が傾いた状態で取付けられると、記録・再生が満足にできない不良品となる。   In such an optical pickup device, if optical components such as a grating are not sufficiently fixed, a phase difference due to vibration of the optical components may increase, leading to a decrease in recording / reproducing performance. Further, if the optical component is mounted with its axis tilted, it becomes a defective product that cannot be satisfactorily recorded / reproduced.

このため、光学部品を嵌め込む取付孔の対向部分に段状凹所を形成し、この段状凹所に接着剤を充填して光学部品の外周面の一部を接着することにより、光学部品を傾きが生じないようにした光ピックアップ装置が提案されている(特許文献1)。その他、グレーティングの前面にカップリングレンズを接着剤で接着して取付孔に挿着したもの(特許文献2)も提案されているが、これはグレーティングを接着剤で取付孔に接着するものではない。
特開平11−110800号公報 特開2004−110930号公報
Therefore, an optical component is formed by forming a stepped recess in an opposing portion of the mounting hole into which the optical component is fitted, and filling the stepped recess with an adhesive and bonding a part of the outer peripheral surface of the optical component. Has been proposed (Patent Document 1). In addition, there has also been proposed (Patent Document 2) in which a coupling lens is bonded to the front surface of the grating with an adhesive and inserted into the mounting hole, but this does not bond the grating to the mounting hole with an adhesive. .
Japanese Patent Laid-Open No. 11-110800 JP 2004-110930 A

上記特許文献1の光ピックアップ装置では、接着剤が光学部品の裏側へ回りこまないように、光学部品の厚み方向の中間に対応する深さの段状凹所を設けて接着剤を充填するため、光学部品の厚みと同じ深さの凹所を設けて接着剤を充填する場合に比べると、光学部品と接着剤との接着面積が却って減少し、接着強度が低下して光学部品の固定が不十分になる恐れがあった。また、光学部品の表面側(上側)から接着剤を段状凹部に注入するため、光学部品の表面が接着剤で汚れる恐れもあった。   In the optical pickup device of Patent Document 1 described above, a stepped recess having a depth corresponding to the middle in the thickness direction of the optical component is provided to fill the adhesive so that the adhesive does not flow to the back side of the optical component. Compared to the case where a recess having the same depth as the optical component is provided and the adhesive is filled, the adhesive area between the optical component and the adhesive is reduced, and the adhesive strength is reduced and the optical component is fixed. There was a risk of becoming insufficient. In addition, since the adhesive is injected into the stepped concave portion from the surface side (upper side) of the optical component, the surface of the optical component may be stained with the adhesive.

そこで、本出願人は、図5に示すように、グレーティング1の外周面下端に接着剤Bの溜まる凹部1aを形成し、このグレーティング1をスライドベース2に形成された取付孔3に嵌め込むと共に、この取付孔3に下方から連通する注入部4を通じて接着剤Bを取付孔3に注入することにより、グレーティング1を接着剤Bで取付孔3に接着するようにした光ピックアップ装置を開発した。この光ピックアップ装置によれば、接着剤Bがグレーティング1の凹部1aに充填されて実用的な接着強度が得られ、また、接着剤Bを下方から注入部4を通じて取付孔3に注入するので、グレーティング1の表面が接着剤Bで汚される心配も解消される。   Therefore, as shown in FIG. 5, the present applicant forms a recess 1 a in which the adhesive B accumulates at the lower end of the outer peripheral surface of the grating 1, and fits the grating 1 into the mounting hole 3 formed in the slide base 2. An optical pickup device was developed in which the adhesive 1 was injected into the mounting hole 3 through the injection part 4 communicating with the mounting hole 3 from below, so that the grating 1 was adhered to the mounting hole 3 with the adhesive B. According to this optical pickup device, the adhesive B is filled in the concave portion 1a of the grating 1 to obtain a practical adhesive strength, and the adhesive B is injected from below into the mounting hole 3 through the injection portion 4. The concern that the surface of the grating 1 is soiled with the adhesive B is also eliminated.

しかしながら、上記の光ピックアップ装置は、グレーティング1の外周面と取付孔3の内周面との間隙が小さいため、接着剤Bが注入部4から上記の間隙に広がり難く、特に、接着剤Bの粘度が高ければ上記の間隙に広がることは殆どない。そのため、接着剤Bを上記の間隙まで侵入させて接着面積を拡大し、グレーティング1の接着強度を一層高めるためには、更に改良を加える必要があった。   However, since the gap between the outer peripheral surface of the grating 1 and the inner peripheral surface of the mounting hole 3 is small in the optical pickup device, the adhesive B hardly spreads from the injection portion 4 to the gap. If the viscosity is high, the gap hardly spreads. For this reason, in order to increase the adhesive strength of the grating 1 by increasing the adhesive area by allowing the adhesive B to penetrate into the gap, it is necessary to make further improvements.

本発明は上記の事情の下になされたもので、グレーティングの接着強度を更に高めてグレーティングを安定させ、位相差のずれを小さくして記録・再生性能の低下を最小限に抑えることができる光ピックアップ装置を提供することを解決課題としている。   The present invention has been made under the above circumstances, and further improves the adhesive strength of the grating, stabilizes the grating, reduces the phase difference, and minimizes the deterioration of the recording / reproducing performance. An object of the present invention is to provide a pickup device.

上記の課題を解決するため、本発明の光ピックアップ装置は、スライドベースのレーザーダイオード前方の取付孔にグレーティングを嵌め込み、取付孔に連通する注入部から接着剤を取付孔に注入してグレーティングを接着した光ピックアップ装置において、取付孔の注入部周辺の内面を凹設してグレーティングの外周面との間隙を拡張し、注入部から未硬化の接着剤が広がって充填される間隙寸法が0.1〜0.5mmの接着剤充填間隙であって、注入部側で間隙寸法が最大となり、注入部から離れるほど間隙寸法が小さくなるような先細り状の間隙形状を有する接着剤充填間隙を形成したことを特徴とするものである。 In order to solve the above-described problems, the optical pickup device of the present invention has a grating fitted in a mounting hole in front of a slide base laser diode, and an adhesive is injected into the mounting hole from an injection portion communicating with the mounting hole to bond the grating. In the optical pickup device , the inner surface around the injection portion of the mounting hole is recessed to expand the gap with the outer peripheral surface of the grating, and the gap size filled with the uncured adhesive spread from the injection portion is 0.1. An adhesive filling gap having a taper-like gap shape, which is an adhesive filling gap of ˜0.5 mm, has a maximum gap size on the injection portion side and becomes smaller as the distance from the injection portion increases. It is characterized by.

ここで、「間隙寸法が0.1〜0.5mmの接着剤充填間隙」とは、接着剤充填間隙の間隙寸法が一定でなく、最大間隙部分の間隙寸法が0.5mm以下、最小間隙部分の間隙寸法が0.1mm以上である接着剤充填間隙を意味するHere, "the gap dimension adhesive filling the gap 0.1~0.5mm", a no gap size of adhesives fill the gap is constant, the gap dimension of the maximum gap portion is 0.5mm or less, the minimum clearance It means an adhesive filling gap where the gap dimension of the part is 0.1 mm or more.

本発明の光ピックアップ装置は、取付孔の注入部周辺の内面を凹設してグレーティングの外周面との間隙を拡張し、注入部から未硬化の接着剤が広がって充填される接着剤充填間隙を形成したため、接着剤とグレーティングの接着面積が拡大されてグレーティングの接着強度と安定性が向上し、グレーティングの振動による位相差のずれが小さくなって、記録・再生性能の低下を最小限に抑えることができる。特に、接着剤充填間隙は、間隙寸法が0.1〜0.5mmであり、且つ、注入部側で間隙寸法が最大となり、注入部から離れるほど間隙寸法が小さくなるような先細り状の間隙形状を有するものであるから、接着剤の粘度が多少高くても接着剤充填間隙接着剤が確実に広がって充填できるようになり、使用できる接着剤の粘度の範囲が広くなるので、従来の接着剤よりも高い粘度の接着剤を使用した場合でも、グレーティングを強固に接着することが可能となる。 The optical pickup device of the present invention has an adhesive filling gap in which an inner surface of the mounting hole around the injection portion is recessed to expand the gap with the outer peripheral surface of the grating, and uncured adhesive is spread and filled from the injection portion. As a result, the bonding area between the adhesive and the grating is expanded to improve the adhesive strength and stability of the grating, and the phase shift due to the vibration of the grating is reduced, minimizing the deterioration in recording and playback performance. it is Ru can. In particular, the adhesive filling gap is a tapered gap shape in which the gap dimension is 0.1 to 0.5 mm, the gap dimension is maximized on the injection part side, and the gap dimension decreases with distance from the injection part. since those having, even if somewhat higher viscosity of the adhesive will be able to fill spread reliably adhered to the adhesive filling the gap, a wide range of viscosity of the adhesive which can be used Runode, conventional Even when an adhesive having a higher viscosity than the adhesive is used, the grating can be firmly bonded.

以下、図面を参照して本発明の具体的な実施形態を詳述する。   Hereinafter, specific embodiments of the present invention will be described in detail with reference to the drawings.

図1は本発明の一実施形態に係る光ピックアップ装置の平面図、図2は同装置の底面図、図3はレーザーダイオードを除いた同装置の左側面図、図4は同装置のグレーティングを装着した部分の拡大図である。   1 is a plan view of an optical pickup device according to an embodiment of the present invention, FIG. 2 is a bottom view of the device, FIG. 3 is a left side view of the device excluding a laser diode, and FIG. 4 is a grating of the device. It is an enlarged view of the attached part.

この光ピックアップ装置は、光ディスク記録・再生装置などに搭載されるものであって、アルミニウム等の金属製のスライドベース2の一側端には、レーザービームを照射するレーザーダイオード5が装着されている。そして、スライドベース2のレーザーダイオード前方(照射方向)に形成された取付孔3(図3,図4参照)には、レーザービームを回折させて3ビームを発生させるグレーティング1が嵌め込まれて、紫外線硬化型の接着剤Bで接着固定されている。   This optical pickup device is mounted on an optical disc recording / reproducing device or the like, and a laser diode 5 for irradiating a laser beam is mounted on one end of a metal slide base 2 such as aluminum. . A grating 1 that diffracts a laser beam to generate three beams is fitted into an attachment hole 3 (see FIGS. 3 and 4) formed in front of the laser diode (irradiation direction) of the slide base 2 to thereby generate ultraviolet rays. It is bonded and fixed with a curable adhesive B.

このグレーティング1の前方には、ビームを任意に反射と透過に分けて2分割するビームスプリッター6と、これらのビームを上方へ反射させる立上げミラー7が装着され、この立上げミラー7の上方には、ビームを集光して光ディスクに照射する対物レンズ8が装着されている。そして、ビームスプリッター6の片側には、センサーレンズ9と光検出器10が装着されている。   In front of the grating 1, a beam splitter 6 that divides the beam into two parts, which are arbitrarily reflected and transmitted, and a rising mirror 7 that reflects these beams upward are mounted, and above the rising mirror 7. Is equipped with an objective lens 8 that condenses the beam and irradiates the optical disk. A sensor lens 9 and a photodetector 10 are attached to one side of the beam splitter 6.

また、スライドベース2の両側には軸受部11a、11bが形成されており、この軸受部11a、11bによって光ディスク記録・再生装置の2本のガイド軸(主軸と副軸)にスライド自在に搭載されるようになっている。   Also, bearings 11a and 11b are formed on both sides of the slide base 2, and these bearings 11a and 11b are slidably mounted on two guide shafts (main shaft and sub shaft) of the optical disk recording / reproducing apparatus. It has become so.

このような光ピックアップ装置は、光ディスク記録・再生装置の2本のガイド軸に沿って光ディスクの回転テーブルの方へスライドしながら、レーザーダイオード5から発せられたレーザービームを、グレーティング1とビームスプリッター6によって3ビームに回折して立上げミラー7で対物レンズ8の方へ反射させ、対物レンズ8で集光して光ディスクに照射することによって、記録・再生が行われる。   Such an optical pickup device slides the laser beam emitted from the laser diode 5 along the two guide shafts of the optical disc recording / reproducing device toward the rotary table of the optical disc, and transmits the laser beam from the grating 1 and the beam splitter 6. Thus, the light is diffracted into three beams, reflected by the rising mirror 7 toward the objective lens 8, condensed by the objective lens 8, and irradiated onto the optical disk, thereby recording / reproducing is performed.

この光ピックアップ装置の大きい特徴はグレーティング1の装着部分にある。即ち、この光ピックアップ装置のグレーティング1を取付ける取付孔3は、改良前の取付孔3とは異なり、図4に拡大して示すように注入部4の周辺の取付孔3の内面3aが凹設されて、この内面3aとグレーティング1の外面との間隙が拡張されており、これによって注入部4から注入された未硬化の接着剤Bが広がって充填される接着剤充填間隙12が形成されている。   A major feature of this optical pickup device is the mounting portion of the grating 1. That is, the mounting hole 3 for attaching the grating 1 of this optical pickup device is different from the mounting hole 3 before improvement, and the inner surface 3a of the mounting hole 3 around the injection portion 4 is recessed as shown in FIG. Thus, the gap between the inner surface 3a and the outer surface of the grating 1 is expanded, thereby forming an adhesive filling gap 12 in which the uncured adhesive B injected from the injection portion 4 is spread and filled. Yes.

従って、注入部4から未硬化の接着剤Bを注入すると、接着剤Bがグレーティング1の凹部1aに充填されるのみならず、接着剤充填間隙12にも広がって充填されるため、接着剤充填間隙12に充填された接着剤Bの分だけグレーティング1の接着面積が拡大して接着強度が上がり、グレーティング1の安定性が更に向上するので、位相差のずれが一層小さくなって記録・再生性能の低下を最小限に抑えることができる。   Therefore, when the uncured adhesive B is injected from the injection portion 4, the adhesive B is not only filled into the recess 1 a of the grating 1, but also spreads and fills the adhesive filling gap 12. The adhesive area of the grating 1 is expanded by the amount of the adhesive B filled in the gap 12 to increase the adhesive strength, and the stability of the grating 1 is further improved. Can be minimized.

この接着剤充填間隙12の間隙寸法は0.1〜0.5mmに設定することが好ましく、また、図4に示すように、注入部4側で間隙寸法が最大となり、注入部4から離れるほど間隙寸法が小さくなるような先細り状の間隙形状にすることが好ましい。上記の間隙寸法と間隙形状を有する接着剤充填間隙12を形成すると、該間隙12への接着剤Bの侵入、充填が更に容易になるため、通常使用される粘度が70000センチポイズ程度の接着剤よりも高い粘度を有する接着剤を使用した場合でも確実に充填できるようになる。従って、使用できる接着剤の粘度の範囲が広くなり、通常の接着剤よりも高い粘度の接着剤を使用してグレーティング1を強固に接着固定することも可能となる。   The gap size of the adhesive filling gap 12 is preferably set to 0.1 to 0.5 mm. Also, as shown in FIG. It is preferable to have a tapered gap shape that reduces the gap size. When the adhesive filling gap 12 having the gap size and the gap shape described above is formed, it is easier to enter and fill the adhesive B into the gap 12, so that the normally used viscosity is about 70000 centipoise. Even when an adhesive having a high viscosity is used, it can be reliably filled. Accordingly, the range of the viscosity of the adhesive that can be used is widened, and the grating 1 can be firmly bonded and fixed using an adhesive having a viscosity higher than that of a normal adhesive.

本発明の一実施形態に係る光ピックアップ装置の平面図である。1 is a plan view of an optical pickup device according to an embodiment of the present invention. 同装置の底面図である。It is a bottom view of the same device. レーザーダイオードを除いた同装置の左側面図である。It is a left view of the same apparatus except a laser diode. 同装置のグレーティングを装着した部分の拡大図である。It is an enlarged view of the part to which the grating of the same device is attached. 改良前の光ピックアップ装置のグレーティングを装着した部分の拡大図である。It is an enlarged view of a portion where a grating of an optical pickup device before improvement is mounted.

符号の説明Explanation of symbols

1 グレーティング
2 スライドベース
3 取付孔
3a 取付孔の注入部周辺の内面
4 注入部
5 レーザーダイオード
6 ビームスプリッター
7 立上げミラー
8 対物レンズ
B 接着剤
DESCRIPTION OF SYMBOLS 1 Grating 2 Slide base 3 Mounting hole 3a Inner surface around the injection | pouring part of an attachment hole 4 Injection | pouring part 5 Laser diode 6 Beam splitter 7 Standing mirror 8 Objective lens B Adhesive

Claims (1)

スライドベースのレーザーダイオード前方の取付孔にグレーティングを嵌め込み、取付孔に連通する注入部から接着剤を取付孔に注入してグレーティングを接着した光ピックアップ装置において、取付孔の注入部周辺の内面を凹設してグレーティングの外面との間隙を拡張し、注入部から未硬化の接着剤が広がって充填される間隙寸法が0.1〜0.5mmの接着剤充填間隙であって、注入部側で間隙寸法が最大となり、注入部から離れるほど間隙寸法が小さくなるような先細り状の間隙形状を有する接着剤充填間隙を形成したことを特徴とする光ピックアップ装置。 In an optical pickup device in which a grating is fitted into the mounting hole in front of the laser diode on the slide base and adhesive is injected into the mounting hole from the injection part communicating with the mounting hole, the inner surface around the injection part of the mounting hole is recessed. extend the gap between the outer circumferential surface of the grating was set, the gap dimension which the adhesive is filled spread uncured from the injection portion is an adhesive filling a gap 0.1 to 0.5 mm, injection unit An optical pickup device characterized in that an adhesive filling gap having a tapered gap shape is formed such that the gap dimension is maximized on the side and the gap dimension decreases as the distance from the injection portion increases .
JP2006002492A 2006-01-10 2006-01-10 Optical pickup device Expired - Fee Related JP4134177B2 (en)

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JP4134177B2 true JP4134177B2 (en) 2008-08-13

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