JPH02161627A - Optical pickup device - Google Patents
Optical pickup deviceInfo
- Publication number
- JPH02161627A JPH02161627A JP31434188A JP31434188A JPH02161627A JP H02161627 A JPH02161627 A JP H02161627A JP 31434188 A JP31434188 A JP 31434188A JP 31434188 A JP31434188 A JP 31434188A JP H02161627 A JPH02161627 A JP H02161627A
- Authority
- JP
- Japan
- Prior art keywords
- light beam
- photodetector
- optical
- light
- mounting part
- 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
- 230000003287 optical effect Effects 0.000 title claims abstract description 57
- 239000000758 substrate Substances 0.000 claims abstract description 5
- 230000004075 alteration Effects 0.000 claims description 9
- 206010010071 Coma Diseases 0.000 claims description 6
- 238000000034 method Methods 0.000 claims description 2
- 206010073261 Ovarian theca cell tumour Diseases 0.000 abstract description 5
- 208000001644 thecoma Diseases 0.000 abstract description 5
- 230000005540 biological transmission Effects 0.000 abstract 1
- 201000009310 astigmatism Diseases 0.000 description 4
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 235000011962 puddings Nutrition 0.000 description 2
- 238000007796 conventional method Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000005476 soldering Methods 0.000 description 1
Landscapes
- Moving Of The Head For Recording And Reproducing By Optical Means (AREA)
- Optical Head (AREA)
Abstract
Description
【発明の詳細な説明】
（イ）産業上の利用分野
本発明は、板状の光学素子により発生される非点収差を
利用して信号記録媒体の信号面への光ビームのフォーカ
シングズレを検出する光ピックアップ装置に関する。Detailed Description of the Invention (a) Industrial Application Field The present invention detects focusing deviation of a light beam on a signal surface of a signal recording medium by using astigmatism generated by a plate-shaped optical element. The present invention relates to an optical pickup device.
（ロ）従来の技術
最近、光ピックアップ装置の多くは、板状の光学素子、
例えば平行平面板状のハーフミラ−を使用して光源から
の光ビームをディスク等の信号記録媒体の信号面に導く
と共に該信号面からの反射光を光検出器に導く為の光路
分割と、前記信号面への光ビームのフォーカシングズレ
を検出する為の非点収差の発生とを行っている。前記ハ
ーフミラ−は光ビームの光軸に対して傾けて配置される
ので、ハーフミラ−を通過した光ビームにはコマ収差が
発生されることが知られている。その為、光検出器に受
光される光ビームの質が劣化し、情報信号（ＨＦ信号）
、あるいはフォーカシング誤差信号の精度が悪化すると
いう問題があった。そこで、従来、例えば特開昭６１−
２３６０３５号公報に示される如く、コマ収差補正用の
光学素子が光検出器に向う光路上に挿入される光ピック
アップ装置が提案されている。(b) Conventional technology Recently, many optical pickup devices use plate-shaped optical elements,
For example, the optical path splitting method uses a parallel plane plate-shaped half mirror to guide the light beam from the light source to the signal surface of a signal recording medium such as a disk, and guides the reflected light from the signal surface to the photodetector. It also generates astigmatism to detect focusing deviation of the light beam on the signal plane. Since the half mirror is arranged at an angle with respect to the optical axis of the light beam, it is known that coma aberration occurs in the light beam passing through the half mirror. As a result, the quality of the light beam received by the photodetector deteriorates, resulting in an information signal (HF signal).
Alternatively, there is a problem that the accuracy of the focusing error signal deteriorates. Therefore, conventionally, for example, JP-A-61-
As shown in Japanese Patent No. 236035, an optical pickup device in which an optical element for correcting coma aberration is inserted on an optical path toward a photodetector has been proposed.
（ハ）発明が解決しようとする課題
しかしながら、上述の光ピックアップ装置は、コマ収差
補正用の光学素子を！特別に必要とする為、製造：１ス
トが高くなると共に光ピックアップ装置の小型化にも不
利であった、
一方、光ビックプ゛ツブ装置に」づいては、光検出器の
受光面に形成される光スポツト径の調整を行う必要があ
るが、その調整は前記光検出器を光ビ・−ムの光軸の垂
直方向にも調整する関係上、従来、光ビームの合焦点の
位置を変化させる為の凹レンズ等のパワーレンズを光検
出器に向う光路上に配置し、該パワーレンズを光軸方向
に変位することにより行っていた。その為、前記パワー
レンズを必要とすると共に種々の光学素子が組み込まれ
る基台をパワーレンズの位置が調整された後に固定され
る構造にする必要があり、光ピックアップ装置の小型化
に不利であると共に構造が複雑化した。(c) Problems to be Solved by the Invention However, the above-mentioned optical pickup device does not require an optical element for coma aberration correction! Because of the special requirements, the manufacturing cost was high and it was disadvantageous to downsizing the optical pickup device. It is necessary to adjust the diameter of the light spot, but since this adjustment also involves adjusting the photodetector in the vertical direction of the optical axis of the light beam, conventional methods have been used to change the position of the focal point of the light beam. This is accomplished by placing a power lens such as a concave lens on the optical path toward the photodetector and displacing the power lens in the optical axis direction. Therefore, the power lens is required, and the base on which various optical elements are installed needs to have a structure in which it is fixed after the position of the power lens is adjusted, which is disadvantageous for downsizing the optical pickup device. As a result, the structure became more complex.
（ニ）課題を解決するための手段
本発明は、」二連の点に鑑み成されたもので、光検出器
が取付けられる取付部を備えると共に該取付部の面が前
記光検出器に受光される光ビ・−〜ノ、の光軸に対して
傾斜可能に成された基板を設け、板状の光学素子を透過
するときに生じる光ビームのコマ収差を補償するべく前
記取付部を前記光学素子の傾斜方向に応じて傾斜させる
様にしている。(d) Means for Solving the Problems The present invention has been made in view of two points, and includes a mounting portion to which a photodetector is attached, and a surface of the mounting portion that receives light from the photodetector. A substrate is provided that can be tilted with respect to the optical axis of the light beam to be transmitted, and the mounting portion is tilted to The optical element is tilted in accordance with the tilt direction of the optical element.
（＊）作用
本発明は、光検出器の受光面げ形成される光スポット径
の調整を行う際、前記光検出器の受光面の垂線が該光検
出器に受光される光ビームの光軸に対して角度を有する
様に前記光検出器を傾けて変位させ、該光検出器の傾き
方向が板状の光学素子を透過するときに生じる光ビーム
のコマ収差を補償する方向となる様にしたものである。(*) Effect When adjusting the diameter of a light spot formed by the light receiving surface of a photodetector, the perpendicular to the light receiving surface of the photodetector is the optical axis of the light beam received by the photodetector. The photodetector is tilted and displaced so as to have an angle with respect to the plate-shaped optical element, and the inclination direction of the photodetector is in a direction that compensates for coma aberration of the light beam that occurs when passing through the plate-shaped optical element. This is what I did.
（へ）実施例
第１図は本発明の一実施例を示す光ピックアップ装置の
光学系を示す構成図で、（１）は光ビーム（レーザー光
）を発生する光源となるレーザーダイオード、（２）は
該レーザーダイオード（１）から発生される光ビームを
回折する回折格子、（３）は光路を分割させる為及び非
点収差を発生聾せる為のハーフミラ−１（４）は該ハー
フミラ−（３）により反射された光ビームを信号記録媒
体（５）の信号面上の信号トラックに収束させる為の対
物レンズ、（６）は信号記録媒体（５）の信号により変
調されると共に前記ハーフミラ−（３）を透過した光ビ
ームを受光する光検出器である。(f) Embodiment FIG. 1 is a configuration diagram showing an optical system of an optical pickup device showing an embodiment of the present invention, in which (1) is a laser diode that is a light source that generates a light beam (laser light), (2) ) is a diffraction grating that diffracts the light beam generated from the laser diode (1), and (3) is a half mirror 1 (4) for splitting the optical path and for generating and deafening astigmatism. (3) is an objective lens for converging the light beam reflected by the signal track onto a signal track on the signal surface of the signal recording medium (5); (3) This is a photodetector that receives the light beam transmitted through the light beam.
前記ハーフミラ−（３）は、平行平面板により形成きれ
ており、面方向がレーザーダイオード（１）からの光ビ
ーム及び信号記録媒体（５）により反射された光ビーム
のそれぞれの光軸に対して４５゜の角度を有して配置さ
れている。The half mirror (3) is formed of a parallel plane plate, and its plane direction is relative to the respective optical axes of the light beam from the laser diode (1) and the light beam reflected by the signal recording medium (5). They are arranged at an angle of 45°.
また、光検出器（６）は、第２図の平面図に示す如く、
−辺から途中まで平行に切り込まれた２木のスリット（
７〉及び（８）を有するプリン！・基板（リノ該スリッ
ト（７）及び（８）に挾まれている取付部（１０）に半
田付は固定されており、前記プリント基板（９）は種々
の光学素子が配置された基台（１１）にネジ（１２ａ）
及び（１２ｂ）により固定されている。そして、前記プ
リント基板（すは該プリント基板（すが有する弾性によ
り前記取付部〈１０）を介して基台（１１）に螺合され
ているネジ（１３）を回すことで、スリット（７）の円
形状の端部（７ａ）及びスリット（８）の円形状の端部
（８ａ）を結ぶ仮想線を回動中心軸として一端が前記光
検出器（６）に受光される光ビームの光軸方向となる矢
印Ａ方向に変位可能に成されている。そして、この場合
、プリント基板（９）の取付部（１０）は、ハーフミラ
−（３）が傾けられた方向と逆向きに傾く様に図におい
て右辺が矢印Ａ方向に変位可能に成されている。尚、プ
リント基板（９）の取付部（１０）には、孔（１４）が
形成されており、散孔（１４）を介して光検出器（６）
の受光面に光ビームが照射される様に成されている。In addition, the photodetector (6) is as shown in the plan view of FIG.
- Two wooden slits cut parallel to each other halfway from the sides (
Pudding with 7> and (8)!・Soldering is fixed to the mounting part (10) sandwiched between the slits (7) and (8) on the board (reno board), and the printed circuit board (9) is connected to the base (on which various optical elements are arranged). 11) screw (12a)
and (12b). Then, by turning the screw (13) screwed onto the base (11) via the mounting portion (10) due to the elasticity of the printed circuit board, the slit (7) is opened. One end of the light beam is received by the photodetector (6), with an imaginary line connecting the circular end (7a) of the slit (8) and the circular end (8a) of the slit (8) as the central axis of rotation. The mounting portion (10) of the printed circuit board (9) is configured to be able to be displaced in the direction of arrow A, which is the axial direction. In the figure, the right side is movable in the direction of arrow A. A hole (14) is formed in the mounting portion (10) of the printed circuit board (9), and a hole (14) is formed through the hole (14). Photodetector (6)
The light beam is irradiated onto the light receiving surface of the sensor.
次に第１図の光ピックアップ装置において、光ビームの
経路を説明する。Next, the path of the light beam in the optical pickup device shown in FIG. 1 will be explained.
レーザーダイオード（１）から発生された光ビームは、
回折格子（２）により回折され、主ビームと２つの副ビ
ームとの３ビームに成された後、ハーフミラ−（３）の
表面により反射されて信号記録媒体（５）の方向は向か
う、前記ハーフミラ−（３）で反射された光ビームは、
対物レンズ（４〉に入射され、該対物レンズ（４）によ
り収束され、信号記録媒体（５〉の信号面に照射される
。前記信号面位照射された光ビームは、該信号面で変調
されて反射され、再び対物レンズ（４）を介してハーフ
ミラ−（３）に戻り、該ハーフミラ−（３）を透過する
。この際、光ビームには、前記ハーフミラ−（３）の厚
み、屈折率及び傾きの角度に応じて非点収差が発生ずる
。前記ハーフミラ−（３）を透過した光ビームは、光検
出器（６）により受光される。その為、前記光検出器（
６）を構成する各受光素子（図示せず）の出力の演算処
理を行うことにより光ビームの信号面へのブオーカシン
グズレ及び光ビームの信号トラックへのトラッキングズ
レが検出出来るから、その検出出力に応じて対物ｌ−ン
ズ（４）を駆動することにより信号記録媒体（５）の信
号トラック上に正確に光ビームを収束許せることが出来
る。The light beam generated from the laser diode (1) is
The half mirror is diffracted by the diffraction grating (2) and formed into three beams, a main beam and two sub beams, and then reflected by the surface of the half mirror (3) and directed toward the signal recording medium (5). - The light beam reflected at (3) is
The light beam is incident on the objective lens (4>), is focused by the objective lens (4), and is irradiated onto the signal surface of the signal recording medium (5>.The light beam irradiated onto the signal surface is modulated on the signal surface. The light beam is reflected, returns to the half mirror (3) via the objective lens (4), and is transmitted through the half mirror (3). and astigmatism occurs depending on the angle of inclination.The light beam transmitted through the half mirror (3) is received by the photodetector (6).
By performing arithmetic processing on the output of each light receiving element (not shown) constituting 6), it is possible to detect the tracking deviation of the light beam to the signal plane and the tracking deviation of the light beam to the signal track. By driving the objective lens (4) in accordance with the output, it is possible to accurately focus the light beam on the signal track of the signal recording medium (5).
ところで、光検出器（６）はプリント基板（９）の取付
部（１０）を介して基台（１］）に螺合されたネジ（１
３）を回すことにより傾斜可能に成されており、その傾
斜方向はハ・−７ミラー（３）が傾けられているＪ。By the way, the photodetector (6) is attached to the screw (1) screwed into the base (1) via the mounting part (10) of the printed circuit board (9).
3) can be tilted by turning the mirror (3), and the direction of tilt is the direction in which the -7 mirror (3) is tilted.
向と逆向きである。ずなわぢ、前記ネジ（１３）を締め
付ける力向い回すと、該ネジ（１３）が更に基台（１１
）に螺合されるので、前記ネジ（１３）を回すことによ
り取付部（１０）の一端がスリット＜７）の端部（７ｏ
）及びスリット〈８）の端部（８ａ）を結ス：仮想線を
回動中心軸として矢印入方向に変位する。その為、光検
出器（６）は前記プリント基板（９）の取付部（１０）
の回動変位（、コ応じて変位されるから前記光検出器（
６）はハーフミラ−（３〉が傾けられ５でいる方向と逆
向きに傾けられる。It is in the opposite direction. When the tightening force on the screw (13) is reversed, the screw (13) further tightens on the base (11).
), so by turning the screw (13), one end of the mounting part (10) is attached to the end (7o) of the slit <7.
) and the end (8a) of the slit (8) are tied together: Displaced in the direction of the arrow with the imaginary line as the center axis of rotation. Therefore, the photodetector (6) is attached to the mounting portion (10) of the printed circuit board (9).
The photodetector () is displaced according to the rotational displacement (,
In 6), the half mirror (3>) is tilted in the opposite direction to the direction in 5.
したがって、光検出器（６）の受光面には、・八−ブミ
ラー（３）を透過するときに生じるコマ収差による影響
を打ち消す−様に光ビームが照射され、前記光検出器（
６）の受光面の傾き番こより前記ｊ−ｖ ＋ｌｙ２差が
補償啓れるととになる。Therefore, the light receiving surface of the photodetector (6) is irradiated with a light beam in such a way as to cancel out the influence of coma aberration that occurs when transmitting through the eight-beam mirror (3), and the light beam is irradiated onto the light receiving surface of the photodetector (
6) According to the angle of inclination of the light-receiving surface, the j-v +ly2 difference is compensated for.
一方、光検出器（６）に受光される光ビーム、−４′な
わち、信号記録媒体（５）の信号面により反射された光
ビームの合焦点の位置を該光検出器（Ｇ）１こ対して光
ビー・ムの光軸方向に移動させること！こ、＾ニり前記
光検出器（６）の受光面に形成される光スポツト径を調
整する必要があるが、実施例においては、ネジ（１３）
を回すことにより賽易に前記光検出器（６）の受光面に
形成される光スポラ１へ径を調整することが出来る。す
なわち、取付部＜１０）が変位きれていない状態におい
て、前記光検出器（６）の受光面は、バラ付きを考慮し
て信号記録媒体（５）の信号面により反射された光ビー
ムの合焦点の後方に配置される様にしておく、そし７て
、前記ネジ（１３）を回すと更に該ネジ（１３）が基台
り１１）に螺合されるので、前記ネジ（１３）を回すこ
とにより光検出器〈６）を矢印Ａ方向に変位して該光検
出器＜６）の受光面に形成される光スポツト径を調整す
ることが出来る。この場合、前記光検出器（６）の受光
面に形成される光スポツト径を調整することが最優先で
あるから該光検出器（６）の受光面の傾斜角度を任意に
設定出来ず、ハーフミラ−（３）を透過するときに生じ
るコマ収差を適度に補償出来ないことがあるが、前記光
検出器（６）の受光面の傾きによりそのコマ収差をわず
かながらでも補償することが可能である。On the other hand, the position of the focal point of the light beam -4' received by the photodetector (6), that is, the light beam reflected by the signal surface of the signal recording medium (5), is set to the photodetector (G) 1. On the other hand, move it in the direction of the optical axis of the light beam! It is necessary to adjust the diameter of the light spot formed on the light receiving surface of the photodetector (6), but in the embodiment, the diameter of the light spot formed on the light receiving surface of the photodetector (6) is adjusted.
By turning , the diameter of the optical spoiler 1 formed on the light receiving surface of the photodetector (6) can be easily adjusted. In other words, in a state where the mounting portion <10) is not completely displaced, the light receiving surface of the photodetector (6) is adjusted to the sum of the light beams reflected by the signal surface of the signal recording medium (5), taking into account variations. Then, turn the screw (13) so that the screw (13) is further screwed into the base 11), so turn the screw (13). By this, the diameter of the light spot formed on the light receiving surface of the photodetector <6) can be adjusted by displacing the photodetector <6) in the direction of arrow A. In this case, since the top priority is to adjust the diameter of the light spot formed on the light receiving surface of the photodetector (6), the inclination angle of the light receiving surface of the photodetector (6) cannot be arbitrarily set. Although it may not be possible to appropriately compensate for the coma aberration that occurs when the light passes through the half mirror (3), it is possible to compensate for the coma aberration, even if only slightly, by tilting the light-receiving surface of the photodetector (6). be.
尚、実施例においては、光検出器（６）が半田ｆ＝１け
されるプリント基板（２ンの取ｔ＝を部（１０＞を直接
、傾斜可能な構造どして前記光検出器（６）を傾斜させ
ているが、前記プリン！・基板（９）を取付ける別部品
を設け、その部品により光検出器（６）を傾斜させても
良い。In the embodiment, the photodetector (6) is connected directly to the printed circuit board (t=10) to which the photodetector (6) is soldered (f=1) by using a tiltable structure or the like. ) is tilted, but it is also possible to provide a separate part to which the pudding! board (9) is attached, and use that part to tilt the photodetector (6).
（ト）発明の効果
以上述べた如く、本発明に依１．１１ば、余分な光学素
子を用いる、：、５λ−なく、かつ簡７Ｂ−（な構成に
より光ビームのコマ収差を補償出来る光ピックアップ装
置が提供出来る。また、本発明に係る光ピックアップ装
置は、コマ収差を補償する為の構造が光検出器の受光面
に形成誹れる光スポット径の調整を行う構造になり得る
ので、その調整の為の構造を特別に必要としないという
利点を有する。(G) Effects of the Invention As described above, according to the present invention, 1.11 uses an extra optical element. Further, in the optical pickup device according to the present invention, the structure for compensating comatic aberration can be a structure for adjusting the diameter of the light spot formed on the light receiving surface of the photodetector. It has the advantage of not requiring any special structure for adjustment.
第１図は本発明の一実施例を示す光ピックアップ装置の
光学系を示す構成図、第２図は光検出器が取付けられた
プリント基板を示す平面図である。
主な図番の説明
（１）・・・レーザーダイオード、（３）・・・ハーフ
ミラ−（４）・・・対物レンズ、 （６）・・・光検出
器、（７）（８）・・・スリット、 （９）・・・プリ
ント基板、 （１０）・・・取付部、 （１１）・・・
基台。FIG. 1 is a configuration diagram showing an optical system of an optical pickup device showing an embodiment of the present invention, and FIG. 2 is a plan view showing a printed circuit board on which a photodetector is attached. Explanation of main figure numbers (1)... Laser diode, (3)... Half mirror (4)... Objective lens, (6)... Photodetector, (7) (8)...・Slit, (9)...Printed circuit board, (10)...Mounting part, (11)...
Base.
Claims (1)
光ビームの光軸に対して傾斜されて配置された板状の光
学素子を透過した後に光検出器により受光される光ピッ
クアップ装置において、前記光検出器が取付けられる取
付部を備えると共に該取付部の面が前記光検出器に受光
される光ビームの光軸に対して傾斜可能に成された基板
を設け、前記光学素子を透過するときに生じる光ビーム
のコマ収差を補償するべく前記取付部を前記光学素子の
傾斜方向に応じて傾斜させる様にしたことを特徴とする
光ピックアップ装置。(1) An optical pickup device in which a light beam modulated on the signal surface of a signal recording medium is received by a photodetector after passing through a plate-shaped optical element arranged at an angle with respect to the optical axis of the light beam. In this method, a substrate is provided, which includes a mounting part on which the photodetector is mounted, and the surface of the mounting part is tiltable with respect to the optical axis of the light beam received by the photodetector, and the optical element is mounted on the substrate. An optical pickup device characterized in that the mounting portion is tilted in accordance with the tilt direction of the optical element in order to compensate for coma aberration of the light beam that occurs when the light beam is transmitted.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63314341A JPH0677330B2 (en) | 1988-12-13 | 1988-12-13 | Optical pickup device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63314341A JPH0677330B2 (en) | 1988-12-13 | 1988-12-13 | Optical pickup device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH02161627A true JPH02161627A (en) | 1990-06-21 |
| JPH0677330B2 JPH0677330B2 (en) | 1994-09-28 |
Family
ID=18052163
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63314341A Expired - Lifetime JPH0677330B2 (en) | 1988-12-13 | 1988-12-13 | Optical pickup device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0677330B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0547026A (en) * | 1991-08-09 | 1993-02-26 | Sanyo Electric Co Ltd | Optical pickup device |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63181135A (en) * | 1987-01-22 | 1988-07-26 | Mitsubishi Electric Corp | Optical pickup device |
| JPS63268130A (en) * | 1987-04-24 | 1988-11-04 | Mitsubishi Electric Corp | Photodetector adjusting mechanism |
-
1988
- 1988-12-13 JP JP63314341A patent/JPH0677330B2/en not_active Expired - Lifetime
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63181135A (en) * | 1987-01-22 | 1988-07-26 | Mitsubishi Electric Corp | Optical pickup device |
| JPS63268130A (en) * | 1987-04-24 | 1988-11-04 | Mitsubishi Electric Corp | Photodetector adjusting mechanism |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0547026A (en) * | 1991-08-09 | 1993-02-26 | Sanyo Electric Co Ltd | Optical pickup device |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0677330B2 (en) | 1994-09-28 |
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