JPH0644353B2 - Optical pickup device - Google Patents
Optical pickup deviceInfo
- Publication number
- JPH0644353B2 JPH0644353B2 JP62012742A JP1274287A JPH0644353B2 JP H0644353 B2 JPH0644353 B2 JP H0644353B2 JP 62012742 A JP62012742 A JP 62012742A JP 1274287 A JP1274287 A JP 1274287A JP H0644353 B2 JPH0644353 B2 JP H0644353B2
- Authority
- JP
- Japan
- Prior art keywords
- photodetector
- pickup device
- optical pickup
- reflected
- parallel plate
- 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.)
- Expired - Lifetime
Links
Landscapes
- Optical Head (AREA)
Description
【発明の詳細な説明】 ［産業上の利用分野］ この発明は、光学的に記録された情報を読み出し、また
は、書き込むための光ピックアップ装置に関するもので
ある。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical pickup device for reading or writing optically recorded information.
［従来の技術］ 第２図は従来の光ピックアップ装置を示す概要図であ
り、図において、（１）はレーザー光源、（２）はレー
ザー光源（１）よりの出射光束、（３）は出射光束
（２）と反射光束（６）を分離するための平行平板素
子、（４）は出射光束（２）を情報記録担体（５）上に
集光するための集光レンズ系、（７）は光検知器であ
り、この光検知器（７）は保護層（７ａ）及び受光層
（７ｂ）によって構成されている。[Prior Art] FIG. 2 is a schematic diagram showing a conventional optical pickup device. In the figure, (1) is a laser light source, (2) is a luminous flux emitted from the laser light source (1), and (3) is a luminous flux. A parallel plate element for separating the luminous flux (2) and the reflected luminous flux (6), (4) a condenser lens system for condensing the outgoing luminous flux (2) on the information recording carrier (5), (7) Is a photodetector, and this photodetector (7) is composed of a protective layer (7a) and a light receiving layer (7b).
次に動作について説明する。レーザー光源（１）よりの
出射光束（２）は、平行平板素子（３）によって反射さ
れ、集光レンズ系（４）によって情報記録担体（５）上
を集光される。この出射光束（２）は情報記録担体
（５）上に記録された情報によって変調され反射され
る。Next, the operation will be described. The luminous flux (2) emitted from the laser light source (1) is reflected by the parallel plate element (3) and focused on the information record carrier (5) by the focusing lens system (4). This outgoing light flux (2) is modulated and reflected by the information recorded on the information record carrier (5).
反射光束（６）は再び集光レンズ系（４）に入射し、平
行平板素子（３）を透過して光検知器（７）に至る。反
射光束はこの光検知器（７）によって電気信号に変換さ
れ、ここに図示しない回路によって、例えばオーディ
オ、ビデオ信号あるいはデジタル信号として利用され
る。The reflected light beam (6) again enters the condenser lens system (4), passes through the parallel plate element (3), and reaches the photodetector (7). The reflected light flux is converted into an electric signal by the photodetector (7) and used as an audio signal, a video signal or a digital signal by a circuit (not shown).
上記情報記録担体（５）は一般に円盤状であって、その
中心を支点に回転しており、出射光束の集光位置は面振
れ等によりたえず移動している。従って、出射光束
（２）の集光位置は記録密度を高めるため、正しく情報
記録担体（５）上に位置させるための機構が必要であ
る。The information recording carrier (5) is generally disk-shaped, rotates about its center as a fulcrum, and the condensing position of the emitted light beam is constantly moving due to surface deflection or the like. Therefore, since the condensing position of the outgoing light flux (2) increases the recording density, a mechanism for correctly positioning it on the information record carrier (5) is required.
そこで光検知器（７）の信号によって、情報記録担体
（５）と反射光束（２）の集光位置とのずれを変位信号
として検出し、サーボ機構（図示せず）によって集光レ
ンズ系（４）を駆動し、たえず、反射光束（２）の集光
位置を情報記録担体（５）上に保持している。Therefore, the deviation between the information recording carrier (5) and the condensing position of the reflected light beam (2) is detected as a displacement signal by the signal of the photodetector (7), and the converging lens system ( 4) is driven, and the focus position of the reflected light flux (2) is constantly held on the information recording carrier (5).
［発明が解決しようとする問題点］ 従来の光ピックアップ装置は以上のように構成されてい
るので、光検知器の構成要素である受光層の受光面に入
射した光の一部が反射されて、同じ構成要素である保護
層の入射部に至り、ここで再び反射されて受光面に至る
ため、受光面のスポット上で干渉が生じる。例えば温度
変化等により、保護層の屈折率が変化することによっ
て、干渉状態が変化し、光検知器の出力信号のレベルが
変化するという問題がある。また、平行平板素子を透過
することにより、光検知器上のスポットにコマ収差が発
生するため、安定した変位信号が得られないという問題
点があった。[Problems to be Solved by the Invention] Since the conventional optical pickup device is configured as described above, a part of the light incident on the light receiving surface of the light receiving layer, which is a component of the photodetector, is reflected. , Reaches the incident portion of the protective layer, which is the same component, and is reflected again there to reach the light receiving surface, so that interference occurs on the spot on the light receiving surface. For example, there is a problem that the interference state changes due to a change in the refractive index of the protective layer due to a temperature change or the like, and the level of the output signal of the photodetector changes. Further, there is a problem that a stable displacement signal cannot be obtained because a coma aberration is generated in the spot on the photodetector by passing through the parallel plate element.
この発明は上記のような問題点を解消するためになされ
たもので、光検知器内での光束の干渉を防止できるとと
もにコマ収差の発生を防止し、安定した変位信号を得る
光ピックアップ装置を得ることを目的とする。The present invention has been made to solve the above problems, and an optical pickup device capable of preventing the interference of light beams in the photodetector and preventing the occurrence of coma aberration to obtain a stable displacement signal is provided. The purpose is to get.
［問題点を解決するための手段］ この発明に係る光ピックアップ装置は、平行平板素子と
光検知器の保護層の入射面を互いに反対方向に反射光束
の光軸に対して傾けて配設したものである。[Means for Solving the Problems] In the optical pickup device according to the present invention, the incident planes of the parallel plate element and the protective layer of the photodetector are arranged so as to be inclined in opposite directions with respect to the optical axis of the reflected light beam. It is a thing.
［作用］ この発明における光ピックアップ装置は、平行平板素子
と光検知器の保護層の入射面を互いに反対方向に反射光
束の光軸に対して傾けて配設したことにより、光検知器
内での光束の干渉が防止されるとともに反射光束のコマ
収差も補正され、安定した変位信号が得られる。[Operation] In the optical pickup device according to the present invention, the parallel plate element and the incident surface of the protective layer of the photodetector are arranged so as to be inclined in the opposite directions with respect to the optical axis of the reflected light beam. The interference of the luminous flux of is prevented and the coma aberration of the reflected luminous flux is also corrected, and a stable displacement signal is obtained.
［実施例］ 以下、この発明の一実施例を図について説明する。第１
図において、光検知器（７）は保護層（７ａ）の入射面
（７ａ−ａ）を反射光束（６）の光軸に対して、平行平
板素子（３）とは反対方向に傾けて配設されており、他
の構成は前記第２図と同様である。[Embodiment] An embodiment of the present invention will be described below with reference to the drawings. First
In the figure, the photodetector (7) is arranged such that the incident surface (7a-a) of the protective layer (7a) is inclined with respect to the optical axis of the reflected light beam (6) in the direction opposite to the parallel plate element (3). The other components are the same as those shown in FIG.
次に動作について説明する。反射光束（６）は光検知器
（７）の保護層（７ａ）に入射した後、受光層（７ｂ）
の受光面（７ｂ−ｂ）に至り、その一部は受光層（７
ｂ）によって吸収され電気信号に変換される。しかし残
りは受光面（７ｂ−ｂ）によって反射され、保護層（７
ａ）の入射面（７ａ−ａ）に戻り再び該入射面で反射さ
れて受光面（７ｂ−ｂ）に至る。Next, the operation will be described. The reflected light flux (6) enters the protective layer (7a) of the photodetector (7), and then the light receiving layer (7b).
Of the light receiving layer (7b-b)
It is absorbed by b) and converted into an electrical signal. However, the rest is reflected by the light receiving surface (7b-b), and the protective layer (7b-b)
It returns to the incident surface (7a-a) of a) and is reflected again by the incident surface to reach the light receiving surface (7b-b).
ところが、保護層（７ａ）の入射面（７ａ−ａ）を傾け
てあるために、受光面（７ｂ−ｂ）に戻る光束は、最初
に形成されたスポットとは異なる位置にスポットを形成
する。このため、光検知器（７）内での光束の干渉が防
止される。However, since the incident surface (7a-a) of the protective layer (7a) is tilted, the light flux returning to the light receiving surface (7b-b) forms a spot at a position different from the spot initially formed. For this reason, the interference of the light flux in the photodetector (7) is prevented.
また、光検知器（７）はその保護層（７ａ）の入射面
（７ａ−ａ）を、平行平板素子（３）と反対の方向に傾
けて配設したことにより、平行平板素子（３）によって
発生したコマ収差が補正され、コマ収差のない良好なス
ポットが光検知器を構成する受光層の受光面上に形成さ
れ、安定した変位信号が得られる。In the photodetector (7), the plane of incidence (7a-a) of the protective layer (7a) is arranged so as to be inclined in the direction opposite to the direction of the parallel plate element (3), so that the parallel plate element (3) is formed. The coma aberration generated by is corrected, a good spot without coma is formed on the light receiving surface of the light receiving layer forming the photodetector, and a stable displacement signal is obtained.
なお、光検知器（７）は、傾き調整装置（図示せず）に
よって、保護層（７ａ）の入射面（７ａ−ａ）の傾きを
調整可能に構成することを可とする。The photodetector (7) can be configured to be able to adjust the inclination of the incident surface (7a-a) of the protective layer (7a) by an inclination adjusting device (not shown).
［発明の効果］ 以上のように、この発明によれば、平行平板素子と光検
知器の保護層の入射面を反射光束の光軸に対して互いに
反対方向に傾けるように構成したので、光検知器内の光
束の干渉が防止され、光検知器の受光層の受光面上にコ
マ収差のない良好なスポットが形成され、安定した変位
信号が得られる光ピックアップ装置を得ることができる
効果がある。[Effects of the Invention] As described above, according to the present invention, since the incident surfaces of the parallel plate element and the protective layer of the photodetector are tilted in directions opposite to each other with respect to the optical axis of the reflected light beam, It is possible to obtain an optical pickup device in which interference of light beams in the detector is prevented, a good spot without coma is formed on the light receiving surface of the light receiving layer of the photodetector, and a stable displacement signal is obtained. is there.
第１図はこの発明の一実施例による光ピックアップ装置
を示す概要図、第２図は従来の光ピックアップ装置を示
す概要図である。 図において、（１）はレーザー光源、（２）は出射光
束、（４）は集光レンズ系、（５）は情報記録担体、
（６）は反射光束、（７）は光検知器、（７ａ）は保護
層、（７ａ−ａ）は入射面、（７ｂ）は受光層である。 なお、図中、同一符号は同一、又は相当部分を示す。FIG. 1 is a schematic diagram showing an optical pickup device according to an embodiment of the present invention, and FIG. 2 is a schematic diagram showing a conventional optical pickup device. In the figure, (1) is a laser light source, (2) is an outgoing light flux, (4) is a condenser lens system, (5) is an information record carrier,
(6) is a reflected light flux, (7) is a photodetector, (7a) is a protective layer, (7a-a) is an incident surface, and (7b) is a light receiving layer. In the drawings, the same reference numerals indicate the same or corresponding parts.
Claims (1)
体に集光する集光レンズ系と、前記情報記録担体よりの
反射光束を前記出射光束より分離する平行平板素子と、
前記反射光束上に配設された透明な保護層と受光層によ
って構成される光検知器を有する光ピックアップ装置に
おいて、前記反射光束の光軸に対して前記平行平板素子
を傾けて配設し、この平行平板素子の傾きと反対方向に
保護層の入射面を傾けて前記光検知器を配設したことを
特徴とする光ピックアップ装置。1. A condenser lens system for condensing a light beam emitted from a laser light source on an information recording carrier, and a parallel plate element for separating a light beam reflected by the information recording carrier from the light beam emitted.
In an optical pickup device having a photodetector composed of a transparent protective layer and a light-receiving layer disposed on the reflected light flux, the parallel plate element is disposed so as to be inclined with respect to the optical axis of the reflected light flux, An optical pickup device characterized in that the photodetector is arranged with the incident surface of the protective layer inclined in a direction opposite to the inclination of the parallel plate element.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62012742A JPH0644353B2 (en) | 1987-01-22 | 1987-01-22 | Optical pickup device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62012742A JPH0644353B2 (en) | 1987-01-22 | 1987-01-22 | Optical pickup device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS63181135A JPS63181135A (en) | 1988-07-26 |
| JPH0644353B2 true JPH0644353B2 (en) | 1994-06-08 |
Family
ID=11813875
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62012742A Expired - Lifetime JPH0644353B2 (en) | 1987-01-22 | 1987-01-22 | Optical pickup device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0644353B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0677330B2 (en) * | 1988-12-13 | 1994-09-28 | 三洋電機株式会社 | Optical pickup device |
-
1987
- 1987-01-22 JP JP62012742A patent/JPH0644353B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPS63181135A (en) | 1988-07-26 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EXPY | Cancellation because of completion of term |