JPH08306061A - Fixing structure of diffraction grating of optical pickup - Google Patents
Fixing structure of diffraction grating of optical pickupInfo
- Publication number
- JPH08306061A JPH08306061A JP7136065A JP13606595A JPH08306061A JP H08306061 A JPH08306061 A JP H08306061A JP 7136065 A JP7136065 A JP 7136065A JP 13606595 A JP13606595 A JP 13606595A JP H08306061 A JPH08306061 A JP H08306061A
- Authority
- JP
- Japan
- Prior art keywords
- diffraction grating
- grating holder
- hole
- holder
- frame
- 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
Landscapes
- Optical Head (AREA)
- Diffracting Gratings Or Hologram Optical Elements (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、光ピックアップの回折
格子の固定構造に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure for fixing a diffraction grating of an optical pickup.
【０００２】[0002]
【従来の技術】例えばＣＤ（コンパクトディスク）にお
ける記録情報は、ディスク面に設けられたピット列（ト
ラック）として蓄積されており、この記録情報を読み取
る光ピックアップ装置として、３ビーム法を用いた装置
が多用されている。2. Description of the Related Art For example, recorded information on a CD (compact disc) is accumulated as a pit train (track) provided on the disc surface, and an apparatus using a 3-beam method is used as an optical pickup device for reading the recorded information. Is often used.
【０００３】この３ビーム法にあっては、回折格子によ
って光源（半導体レーザー）からの光ビームを０次、±
１次の３本の光束に分割し、ディスク上で３つの光スポ
ットが情報トラックより若干角度がついた位置に並ぶよ
うに集光している。そして、この両端の±１次回折光ス
ポットからの反射光信号のレベルが常に等しくなるよう
にサーボをかけることで、真ん中の０次光スポットの位
置をトラック中央に保っている。In the three-beam method, a light beam from a light source (semiconductor laser) is converted into a zero-order, ±
It is divided into three primary light fluxes and is condensed so that three light spots are aligned on the disk at positions slightly angled from the information track. Then, the servo is applied so that the levels of the reflected light signals from the ± 1st-order diffracted light spots at both ends are always the same, thereby keeping the position of the middle 0th-order light spot at the track center.
【０００４】上記回折格子をフレーム（固定部材）に対
して取り付けるにあたっては、上記スポットの位置調整
が必要とされることから、光軸を中心として回転可能に
取り付ける必要がある。このような回折格子のフレーム
に対する固定構造に関しては種々の提案がなされている
が、例えば特開平２−２１８０２８号公報記載の光ピッ
クアップが知られている。これを示したのが図５であ
る。When the diffraction grating is attached to the frame (fixing member), it is necessary to adjust the position of the spot, so that the diffraction grating must be attached so as to be rotatable about the optical axis. Various proposals have been made for such a structure for fixing the diffraction grating to the frame. For example, an optical pickup disclosed in Japanese Patent Application Laid-Open No. 2-218028 is known. This is shown in FIG.
【０００５】同図において、符号１１は光学基台を、１
２は丸形の座部１２ａを有する半導体レーザーを、１４
は回折格子ホルダを、それぞれ示している。光学基台１
１には、半導体レーザー１２の座部１２ａを取り付ける
ための該座部１２ａと同径の座ぐり１１ａが設けられて
おり、さらにこの座ぐり１１ａより奥側には、同軸の取
り付け孔１１ｂが設けられている。In the figure, reference numeral 11 indicates an optical base.
2 is a semiconductor laser having a round seat 12a, 14
Indicate diffraction grating holders, respectively. Optical base 1
1 is provided with a counterbore 11a having the same diameter as that of the seat 12a for mounting the seat 12a of the semiconductor laser 12, and further, a coaxial mounting hole 11b is provided on the back side of the counterbore 11a. Has been.
【０００６】回折格子ホルダ１４は、取り付け孔１１ｂ
の径より大きい第１の胴部１４ａと、この取り付け孔１
１ｂと略同径の第２の胴部１４ｂと、を有する段付き形
状をしており、第１の胴部１４ａの内部には回折格子１
３が収められている。The diffraction grating holder 14 has a mounting hole 11b.
The first body 14a larger than the diameter of the
1b has a stepped shape having a second body portion 14b having substantially the same diameter as that of the diffraction grating 1 inside the first body portion 14a.
3 is stored.
【０００７】回折格子ホルダ１４の第２の胴部１４ｂ
は、光学基台１１の取り付け孔１１ｂに挿入されてお
り、この状態で、光軸１６方向に付勢力を有する板バネ
１５が第１の胴部１４ａと光学基台１１との間に介挿さ
れている。すなわち、回折格子ホルダ１４は、板バネ１
５により光学基台１１に押し付けられた状態となってい
るが、回転可能となっている。従って、例えば人手によ
り回折格子ホルダ１４を、板バネ１５の付勢力に抗して
回転させれば、上記スポットの位置調整がなされる。The second body portion 14b of the diffraction grating holder 14
Is inserted into the mounting hole 11b of the optical base 11, and in this state, the leaf spring 15 having a biasing force in the direction of the optical axis 16 is inserted between the first barrel portion 14a and the optical base 11. Has been done. That is, the diffraction grating holder 14 includes the leaf spring 1
Although it is pressed against the optical base 11 by 5, it is rotatable. Therefore, for example, if the diffraction grating holder 14 is manually rotated against the urging force of the leaf spring 15, the position of the spot is adjusted.
【０００８】[0008]
【発明が解決しようとする課題】しかしながら、上記回
折格子の固定構造にあっては、以下の問題点がある。す
なわち、回折格子ホルダ１４を押え付けるのに板バネ１
５が必要になることから、部品点数が多くなり、高コス
ト化するといった問題があった。However, the fixed structure of the diffraction grating has the following problems. That is, the leaf spring 1 is used to hold down the diffraction grating holder 14.
Since 5 is required, there is a problem that the number of parts increases and the cost increases.
【０００９】そこで本発明は、部品点数が減少されて低
コスト化が図られる光ピックアップの回折格子の固定構
造を提供することを目的とする。SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a structure for fixing a diffraction grating of an optical pickup in which the number of parts is reduced and the cost is reduced.
【００１０】[0010]
【課題を解決するための手段】第１手段の光ピックアッ
プの回折格子の固定構造は、上記目的を達成するため
に、光源から出射された光ビームを複数の光ビームに分
割する回折格子が一側端部に固着され、その外周円筒面
に光軸方向に沿う突起が複数設けられた回折格子ホルダ
を具備し、この回折格子ホルダをフレームに穿設した孔
に圧入してなる。In order to achieve the above object, the fixed structure of the diffraction grating of the optical pickup of the first means is a diffraction grating that divides the light beam emitted from the light source into a plurality of light beams. A diffraction grating holder is provided, which is fixed to the side end portion and has a plurality of projections along the optical axis direction provided on the outer peripheral cylindrical surface thereof, and the diffraction grating holder is press-fitted into a hole formed in the frame.
【００１１】第２手段の光ピックアップの回折格子の固
定構造は、上記目的を達成するために、上記第１手段に
加えて、回折格子ホルダの突起とフレームの孔とを、線
接触する構造とした。In order to achieve the above object, the fixing structure of the diffraction grating of the optical pickup of the second means is, in addition to the first means, a structure in which the projection of the diffraction grating holder and the hole of the frame are in line contact with each other. did.
【００１２】第３手段の光ピックアップの回折格子の固
定構造は、上記目的を達成するために、上記第１または
第２手段に加えて、回折格子ホルダの突起の数を、４個
以上とした。In order to achieve the above-mentioned object, the fixing structure of the diffraction grating of the optical pickup of the third means has, in addition to the above-mentioned first or second means, the number of protrusions of the diffraction grating holder is four or more. .
【００１３】[0013]
【作用】このような第１手段における光ピックアップの
回折格子の固定構造によれば、回折格子を一側端部に固
着した回折格子ホルダが、フレームに穿設された孔に圧
入されると、回折格子ホルダの外周円筒面に設けられた
光軸方向に沿う複数の突起が孔に圧接するが、外周面全
体が孔に圧接しているわけではないことから、該回折格
子ホルダは圧入後も光軸を中心として回転される。従っ
て、回折格子ホルダを回転可能に押し付ける板バネが不
要にされる。According to the structure for fixing the diffraction grating of the optical pickup in the first means, when the diffraction grating holder having the diffraction grating fixed to one end is pressed into the hole formed in the frame, A plurality of protrusions along the optical axis direction provided on the outer peripheral cylindrical surface of the diffraction grating holder are pressed against the hole, but the entire outer peripheral surface is not pressed against the hole. It is rotated around the optical axis. Therefore, a leaf spring that rotatably presses the diffraction grating holder is unnecessary.
【００１４】また、第２手段における光ピックアップの
回折格子の固定構造によれば、回折格子ホルダの突起と
フレームの孔とが線接触する構造にされると、突起とフ
レーム孔との圧接部分が最小となり、回折格子ホルダは
圧入後も光軸を中心として第１手段よりさらに無理なく
回転される。また、全面圧接する円形同士の圧入では、
回折格子ホルダの外周面とフレーム孔の寸法精度が厳し
く要求され圧入作業が難しいが、複数の突起による複数
箇所での線接触にあっては、多少の寸法のバラツキによ
り圧接しない突起があっても問題がない。Further, according to the fixing structure of the diffraction grating of the optical pickup in the second means, when the projection of the diffraction grating holder and the hole of the frame are in line contact with each other, the press contact portion between the projection and the frame hole is formed. It becomes the minimum, and the diffraction grating holder is more easily rotated about the optical axis after the press-fitting by the first means. In addition, when press-fitting circles that are pressed against each other,
The press-fitting work is difficult because the dimensional accuracy of the outer peripheral surface of the diffraction grating holder and the frame hole are strictly required, but in the case of line contact at multiple locations with multiple projections, even if there are projections that do not come into pressure contact due to some dimensional variation. there is no problem.
【００１５】また、第３手段における光ピックアップの
回折格子の固定構造によれば、回折格子ホルダの外周面
及びフレーム孔の少なくとも一方の真円度がだされてい
ないと、回折格子ホルダの突起の数が３個以下の場合に
は、回折格子ホルダがスポット位置調整時にフレーム孔
内で傾き、光軸ズレを発生させることがあるが、４個以
上の場合には、回折格子ホルダがフレーム孔に確実に圧
入され傾くことはない。Further, according to the structure for fixing the diffraction grating of the optical pickup in the third means, if the roundness of at least one of the outer peripheral surface of the diffraction grating holder and the frame hole is not made, the protrusion of the diffraction grating holder If the number is three or less, the diffraction grating holder may tilt in the frame hole when adjusting the spot position and cause an optical axis shift, but if the number is four or more, the diffraction grating holder may be positioned in the frame hole. It is securely press-fit and does not tilt.
【００１６】[0016]
【実施例】以下、本発明の実施例を図面に基づいて説明
する。図１は本発明の一実施例における回折格子ホルダ
を表した正面図、図２は同上回折格子ホルダのＡ−Ａ断
面図、図３は同上回折格子ホルダのＢ−Ｂ断面図、図４
は同上回折格子ホルダの背面図であり、該回折格子ホル
ダはＣＤの光ピックアップに適用されている。Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a front view showing a diffraction grating holder according to an embodiment of the present invention, FIG. 2 is a sectional view taken along the line AA of the same diffraction grating holder, and FIG. 3 is a sectional view taken along the line BB of the same diffraction grating holder.
FIG. 4 is a rear view of the same diffraction grating holder, which is applied to a CD optical pickup.
【００１７】図１乃至図４において、符号１はその軸心
を図示されない光源の光軸Ｘと同軸とした略円筒形状の
樹脂よりなる回折格子ホルダを示しており、この回折格
子ホルダ１の軸心部分には、軸線（光軸）Ｘに沿った段
付きの貫通孔１ｄが形成されている。すなわち、回折格
子ホルダ１は略中空円筒形状をなしており、上記貫通孔
１ｄを光源からの光ビームが通過するようになってい
る。1 to 4, reference numeral 1 denotes a diffraction grating holder made of a substantially cylindrical resin whose axis is coaxial with the optical axis X of a light source (not shown). The axis of the diffraction grating holder 1 is shown. A stepped through hole 1d is formed along the axis (optical axis) X in the core portion. That is, the diffraction grating holder 1 has a substantially hollow cylindrical shape, and the light beam from the light source passes through the through hole 1d.
【００１８】回折格子ホルダ１の一方の端面（図２にお
ける左側端面）１ｂには、複数の凸部１ｅが一体成形さ
れており、これら凸部１ｅ間に仮想線で示される回折格
子２が、その軸心を光軸Ｘと同軸として嵌め込まれ固着
されている。この回折格子２は、光源から出射された光
ビームを複数の光ビームに分割するためのものである。A plurality of convex portions 1e are integrally formed on one end surface (left end surface in FIG. 2) of the diffraction grating holder 1, and the diffraction grating 2 shown by imaginary lines between these convex portions 1e is The shaft center is fitted and fixed coaxially with the optical axis X. The diffraction grating 2 is for dividing the light beam emitted from the light source into a plurality of light beams.
【００１９】回折格子ホルダ１の外周面１ｃには、多数
（本実施例においては１２個）の突起１ａが、光軸Ｘに
沿うようにして一体成形されており、これら突起１ａの
光軸Ｘに直交する断面形状は半円となっている。On the outer peripheral surface 1c of the diffraction grating holder 1, a large number (12 in this embodiment) of projections 1a are integrally formed along the optical axis X, and the projections 1a have an optical axis X. The cross-sectional shape orthogonal to is a semicircle.
【００２０】このように構成された回折格子ホルダ１
は、樹脂よりなるフレーム（不図示）に穿設された一点
鎖線で示される孔３に圧入されている。従って、フレー
ム孔３と上記突起１ａとは線接触で圧接した状態となっ
ている。すなわち、突起１ａとフレーム孔３との圧接部
分は最小となっており、回折格子ホルダ１を圧入した後
のスポット位置の調整時に、該回折格子ホルダ１を光軸
Ｘを中心として無理なく回転できるようになっている。
そして、回転方向の調整がなされたら、該回折格子ホル
ダ１は、例えば接着剤によりフレーム孔３に固定され
る。Diffraction grating holder 1 thus constructed
Is press-fitted into a hole 3 shown by a chain line formed in a frame (not shown) made of resin. Therefore, the frame hole 3 and the protrusion 1a are in pressure contact with each other by line contact. That is, the pressure contact portion between the protrusion 1a and the frame hole 3 is the smallest, and the diffraction grating holder 1 can be rotated without difficulty about the optical axis X when adjusting the spot position after the diffraction grating holder 1 is press-fitted. It is like this.
Then, when the rotation direction is adjusted, the diffraction grating holder 1 is fixed to the frame hole 3 with an adhesive, for example.
【００２１】ところで、回折格子ホルダ１の構造を突起
１ａが設けられていない構造、すなわち外周面を円形と
した場合には、円形同士の圧入となり、回折格子ホルダ
１の外周面とフレーム孔３の寸法精度が厳しく要求され
圧入作業が難しい。しかしながら、本実施例のように複
数の突起１ａによる複数箇所での線接触とすると、多少
の寸法のバラツキにより圧接しない突起があっても他の
突起が圧接するので、問題はない。By the way, when the structure of the diffraction grating holder 1 is not provided with the protrusions 1a, that is, when the outer peripheral surface is circular, the circular shapes are press-fitted, and the outer peripheral surface of the diffraction grating holder 1 and the frame hole 3 are inserted. Strict dimensional accuracy is required and press-fitting work is difficult. However, in the case of line contact at a plurality of points by a plurality of protrusions 1a as in the present embodiment, there is no problem because there is a protrusion that does not come into pressure contact due to some dimensional variation, but the other protrusions come into pressure contact.
【００２２】また、上述のように、回折格子ホルダ１、
フレームが樹脂により成形されていることから、回折格
子ホルダ１の外周面及びフレーム孔３の真円度をだすこ
とは非常に難しく、突起１ａの数によっては、回折格子
ホルダ１がスポット位置調整時にフレーム孔３内で傾
き、光軸ズレを発生させる畏れがある。Further, as described above, the diffraction grating holder 1,
Since the frame is made of resin, it is very difficult to obtain the circularity of the outer peripheral surface of the diffraction grating holder 1 and the frame hole 3, and depending on the number of the protrusions 1a, the diffraction grating holder 1 may be difficult to adjust when the spot position is adjusted. There is a fear of tilting in the frame hole 3 and causing an optical axis shift.
【００２３】そこで、本発明者は、真円度のでていない
回折格子ホルダ１、フレームを用い、回折格子ホルダ１
がフレーム孔３内で傾かずにスポット位置調整できる突
起１ａの数を実験により調べた結果、突起１ａの数を４
個以上にすれば、傾かずにスポット位置調整可能である
ことを確認した。Therefore, the inventor of the present invention uses the diffraction grating holder 1 and the frame which are not round to form the diffraction grating holder 1.
Of the number of protrusions 1a capable of adjusting the spot position without tilting in the frame hole 3 as a result of the experiment, the number of protrusions 1a is 4
It was confirmed that the spot position can be adjusted without tilting if the number is more than one.
【００２４】このように、本実施例においては、回折格
子２が一側端部（本実施例においては端面）１ｂに固着
された回折格子ホルダ１を、フレームに穿設された孔３
に圧入して、回折格子ホルダ１の外周円筒面１ｃに設け
られた光軸Ｘ方向に沿う複数の突起１ａを孔３に圧接
し、外周面全体を孔３に圧接しないようにして、該回折
格子ホルダ１を圧入後も光軸Ｘを中心として回転可能と
し、回折格子ホルダ１を回転可能に押し付ける従来技術
の板バネ１５を不要にするよう構成しているので、部品
点数を減少できるようになっており、低コスト化を図る
ことが可能となっている。As described above, in this embodiment, the diffraction grating holder 1 having the diffraction grating 2 fixed to one end (end surface in this embodiment) 1b is provided with the hole 3 formed in the frame.
The plurality of protrusions 1a provided on the outer peripheral cylindrical surface 1c of the diffraction grating holder 1 along the optical axis X direction are pressed into the hole 3, and the entire outer peripheral surface is prevented from being pressed into the hole 3. Since the grating holder 1 can be rotated about the optical axis X even after being press-fitted and the conventional leaf spring 15 for pressing the diffraction grating holder 1 rotatably is unnecessary, the number of parts can be reduced. Therefore, it is possible to reduce the cost.
【００２５】また、本実施例においては、回折格子ホル
ダ１の突起１ａとフレームの孔３とを線接触する構造と
し、突起１ａとフレーム孔３との圧接部分を最小とし
て、回折格子ホルダ１を圧入後も光軸Ｘを中心として無
理なく回転可能とするよう構成しているので、作業性を
向上することが可能となっている。しかも、全面圧接す
る円形同士の圧入では、回折格子ホルダ１の外周面とフ
レーム孔３の寸法精度が厳しく要求され圧入作業が難し
いが、複数の突起１ａによる複数箇所での線接触とし、
多少の寸法のバラツキにより圧接しない突起があっても
問題がないよう構成しているので、作業性をさらに向上
することが可能となっている。Further, in this embodiment, the structure is such that the protrusion 1a of the diffraction grating holder 1 and the hole 3 of the frame are in line contact with each other, and the pressure contact portion between the protrusion 1a and the frame hole 3 is minimized, and the diffraction grating holder 1 is Since it is configured so as to be able to rotate around the optical axis X without difficulty even after press fitting, it is possible to improve workability. Moreover, in the press-fitting of circles that press-contact the entire surface, the dimensional accuracy of the outer peripheral surface of the diffraction grating holder 1 and the frame hole 3 is strictly required, and the press-fitting work is difficult, but line contact is made at a plurality of locations by a plurality of protrusions 1a
Since there is no problem even if there is a protrusion that does not come into pressure contact due to a slight variation in size, it is possible to further improve workability.
【００２６】また、本実施例においては、回折格子ホル
ダ１の外周面及びフレーム孔３の少なくとも一方の真円
度がでていないと、回折格子ホルダ１の突起１ａの数が
３個以下の場合には、回折格子ホルダ１がスポット位置
調整時にフレーム孔３内で傾き、光軸ズレを発生させる
ことがあるが、回折格子ホルダ１の突起１ａの数を４個
以上（本実施例では１２個）とし、回折格子ホルダ１を
フレーム孔３に確実に圧入して傾かないよう構成してい
るので、回転調整時に光軸ズレを生じることがなくなっ
ており、情報信号の検出精度を向上することが可能とな
っている。Further, in the present embodiment, when the circularity of at least one of the outer peripheral surface of the diffraction grating holder 1 and the frame hole 3 is not correct, the number of the protrusions 1a of the diffraction grating holder 1 is 3 or less. In some cases, the diffraction grating holder 1 may be tilted in the frame hole 3 when the spot position is adjusted to cause an optical axis shift. However, the number of the protrusions 1a of the diffraction grating holder 1 is 4 or more (12 in this embodiment). ), The diffraction grating holder 1 is securely press-fitted into the frame hole 3 so as not to be tilted, so that the optical axis is not displaced during the rotation adjustment, and the detection accuracy of the information signal can be improved. It is possible.
【００２７】以上本発明者によってなされた発明を実施
例に基づき具体的に説明したが、本発明は上記実施例に
限定されるものではなく、その要旨を逸脱しない範囲で
種々変形可能であるというのはいうまでもなく、例え
ば、上記実施例においては、突起１ａの光軸Ｘに直交す
る断面形状が半円となるようにしているが、この形状に
限定されるものではなく、例えば断面形状が三角形とな
るようにしても良く、要はフレーム孔３と突起とが回折
格子ホルダの圧入により線接触となるような形状であれ
ば良い。Although the invention made by the present inventor has been specifically described based on the embodiments, the present invention is not limited to the above embodiments, and various modifications can be made without departing from the scope of the invention. Needless to say, for example, in the above-described embodiment, the cross-sectional shape of the protrusion 1a perpendicular to the optical axis X is a semicircle, but the shape is not limited to this, and the cross-sectional shape is, for example, May have a triangular shape, as long as the frame hole 3 and the protrusion are in line contact with each other by press fitting the diffraction grating holder.
【００２８】また、上記実施例においては、回折格子ホ
ルダ１を調整時に回転しやすいように、突起１ａとフレ
ーム孔３とが線接触となるようにしているが、回転でき
るようであれば、突起１ａの形状を変えてフレーム孔３
に対して面接触となるようにしても良い。In the above embodiment, the projection 1a and the frame hole 3 are in line contact with each other so that the diffraction grating holder 1 can be easily rotated during adjustment. Frame hole 3 by changing the shape of 1a
The surface contact may be made.
【００２９】なお、上記実施例においては、ＣＤの光ピ
ックアップに対して説明したが、光磁気ディスク等の光
ピックアップに対しても同様に適用できるというのはい
うまでもない。In the above embodiment, the description has been made with respect to the optical pickup of CD, but it goes without saying that the same can be applied to the optical pickup of a magneto-optical disk or the like.
【００３０】[0030]
【発明の効果】以上述べたように、第１発明の光ピック
アップの回折格子の固定構造によれば、回折格子が一側
端部に固着された回折格子ホルダを、フレームに穿設さ
れた孔に圧入して、回折格子ホルダの外周円筒面に設け
られた光軸方向に沿う複数の突起を孔に圧接し、外周面
全体を孔に圧接しないようにして、該回折格子ホルダを
圧入後も光軸を中心として回転可能とし、回折格子ホル
ダを回転可能に押し付ける板バネを不要にするよう構成
したものであるから、部品点数を減少でき、低コスト化
を図ることが可能となる。As described above, according to the structure for fixing the diffraction grating of the optical pickup of the first invention, the diffraction grating holder having the diffraction grating fixed to one end is provided with a hole formed in the frame. And press the plurality of protrusions along the optical axis provided on the outer peripheral cylindrical surface of the diffraction grating holder into the hole and keep the entire outer peripheral surface from pressing into the hole. Since it is configured to be rotatable about the optical axis and to eliminate the need for a leaf spring that rotatably presses the diffraction grating holder, the number of parts can be reduced and cost can be reduced.
【００３１】また、第２発明の光ピックアップの回折格
子の固定構造によれば、第１発明に加えて、回折格子ホ
ルダの突起とフレームの孔とを線接触する構造とし、突
起とフレーム孔との圧接部分を最小として、回折格子ホ
ルダを圧入後も光軸を中心として第１発明よりさらに無
理なく回転可能とするよう構成したものであるから、第
１発明の効果に加えて、作業性を向上することが可能と
なる。しかも、全面圧接する円形同士の圧入では、回折
格子ホルダの外周面とフレーム孔の寸法精度が厳しく要
求され圧入作業が難しいが、複数の突起による複数箇所
での線接触とし、多少の寸法のバラツキにより圧接しな
い突起があっても問題がないよう構成したものであるか
ら、作業性をさらに向上することが可能となる。According to the diffraction grating fixing structure of the optical pickup of the second invention, in addition to the first invention, the projection of the diffraction grating holder and the hole of the frame are in line contact with each other, and the projection and the frame hole are provided. Since the pressure contact portion is minimized and the diffraction grating holder can be rotated around the optical axis more easily than the first invention even after being press-fitted, the workability is improved in addition to the effect of the first invention. It is possible to improve. Moreover, when press-fitting circles that press-contact the entire surface, the dimensional accuracy of the outer peripheral surface of the diffraction grating holder and the frame hole are strictly required, and press-fitting work is difficult, but line contact is made at multiple points by multiple protrusions, and some variation in size occurs. With this configuration, there is no problem even if there is a protrusion that does not come into pressure contact, so it is possible to further improve workability.
【００３２】また、第３発明の光ピックアップの回折格
子の固定構造によれば、第１または第２発明に加えて、
回折格子ホルダの外周面及びフレーム孔の少なくとも一
方の真円度がでていないと、回折格子ホルダの突起の数
が３個以下の場合には、回折格子ホルダがスポット位置
調整時にフレーム孔内で傾き、光軸ズレを発生させるこ
とがあるが、回折格子ホルダの突起の数を４個以上と
し、回折格子ホルダをフレーム孔に確実に圧入して傾か
ないよう構成したものであるから、第１または第２発明
の効果に加えて、光軸ズレを生じることがなく、情報信
号の検出精度を向上することが可能となる。According to the diffraction grating fixing structure of the optical pickup of the third invention, in addition to the first or second invention,
If the circularity of at least one of the outer peripheral surface of the diffraction grating holder and the frame hole is not correct, and if the number of protrusions of the diffraction grating holder is three or less, the diffraction grating holder will not move in the frame hole during spot position adjustment. Although the tilt and the optical axis shift may occur, the number of protrusions of the diffraction grating holder is four or more, and the diffraction grating holder is securely press-fitted into the frame hole to prevent tilting. Alternatively, in addition to the effect of the second invention, it is possible to improve the detection accuracy of the information signal without causing the optical axis shift.
【図１】本発明の一実施例における回折格子ホルダを表
した正面図である。FIG. 1 is a front view showing a diffraction grating holder according to an embodiment of the present invention.
【図２】同上回折格子ホルダのＡ−Ａ断面図である。FIG. 2 is a sectional view of the diffraction grating holder taken along the line AA of FIG.
【図３】同上回折格子ホルダのＢ−Ｂ断面図である。FIG. 3 is a sectional view taken along line BB of the diffraction grating holder of the above.
【図４】同上回折格子ホルダの背面図である。FIG. 4 is a rear view of the above diffraction grating holder.
【図５】従来技術における光ピックアップの要部を表し
た分解斜視図である。FIG. 5 is an exploded perspective view showing a main part of an optical pickup according to a conventional technique.
１ 回折格子ホルダ １ａ 突起 １ｂ 一側端部 １ｃ 外周円筒面 ２ 回折格子 ３ フレームの孔 Ｘ 光軸 1 Diffraction Grating Holder 1a Protrusion 1b One Side End 1c Outer Circular Cylinder Surface 2 Diffraction Grating 3 Frame Hole X Optical Axis
Claims (3)
ビームに分割する回折格子が一側端部に固着され、その
外周円筒面に光軸方向に沿う突起が複数設けられた回折
格子ホルダを具備し、 この回折格子ホルダをフレームに穿設した孔に圧入して
なる光ピックアップの回折格子の固定構造。1. A diffraction grating holder having a diffraction grating for dividing a light beam emitted from a light source into a plurality of light beams, fixed to one end, and having a plurality of protrusions along the optical axis on its outer peripheral cylindrical surface. A structure for fixing a diffraction grating of an optical pickup, which comprises press-fitting this diffraction grating holder into a hole formed in a frame.
子の固定構造において、 回折格子ホルダの突起とフレームの孔とを、線接触する
構造とした光ピックアップの回折格子の固定構造。2. The structure for fixing the diffraction grating of the optical pickup according to claim 1, wherein the protrusion of the diffraction grating holder and the hole of the frame are in line contact with each other.
の回折格子の固定構造において、 回折格子ホルダの突起の数は、４個以上であることを特
徴とする光ピックアップの回折格子の固定構造。3. The structure for fixing a diffraction grating of an optical pickup according to claim 1, wherein the number of protrusions of the diffraction grating holder is 4 or more.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13606595A JP3263569B2 (en) | 1995-05-10 | 1995-05-10 | Fixed structure of diffraction grating for optical pickup |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13606595A JP3263569B2 (en) | 1995-05-10 | 1995-05-10 | Fixed structure of diffraction grating for optical pickup |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH08306061A true JPH08306061A (en) | 1996-11-22 |
| JP3263569B2 JP3263569B2 (en) | 2002-03-04 |
Family
ID=15166396
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP13606595A Expired - Fee Related JP3263569B2 (en) | 1995-05-10 | 1995-05-10 | Fixed structure of diffraction grating for optical pickup |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3263569B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5370383B2 (en) | 2011-01-28 | 2013-12-18 | 船井電機株式会社 | Optical element holder and optical pickup having the same |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5810407U (en) * | 1981-07-13 | 1983-01-22 | 日本電産コパル株式会社 | retaining ring device |
| JPS5948513U (en) * | 1982-09-24 | 1984-03-31 | オリンパス光学工業株式会社 | Lens holding device |
| JPS648215U (en) * | 1987-06-30 | 1989-01-18 | ||
| JPH0276320U (en) * | 1988-11-29 | 1990-06-12 | ||
| JPH03152734A (en) * | 1989-11-09 | 1991-06-28 | Matsushita Electric Ind Co Ltd | Optical head |
| JPH0773495A (en) * | 1993-09-03 | 1995-03-17 | Canon Inc | Light source device |
-
1995
- 1995-05-10 JP JP13606595A patent/JP3263569B2/en not_active Expired - Fee Related
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5810407U (en) * | 1981-07-13 | 1983-01-22 | 日本電産コパル株式会社 | retaining ring device |
| JPS5948513U (en) * | 1982-09-24 | 1984-03-31 | オリンパス光学工業株式会社 | Lens holding device |
| JPS648215U (en) * | 1987-06-30 | 1989-01-18 | ||
| JPH0276320U (en) * | 1988-11-29 | 1990-06-12 | ||
| JPH03152734A (en) * | 1989-11-09 | 1991-06-28 | Matsushita Electric Ind Co Ltd | Optical head |
| JPH0773495A (en) * | 1993-09-03 | 1995-03-17 | Canon Inc | Light source device |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3263569B2 (en) | 2002-03-04 |
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