JPS5884632U - optical head - Google Patents
optical headInfo
- Publication number
- JPS5884632U JPS5884632U JP18040081U JP18040081U JPS5884632U JP S5884632 U JPS5884632 U JP S5884632U JP 18040081 U JP18040081 U JP 18040081U JP 18040081 U JP18040081 U JP 18040081U JP S5884632 U JPS5884632 U JP S5884632U
- Authority
- JP
- Japan
- Prior art keywords
- lens
- beam splitter
- cylindrical lens
- semi
- convergence
- 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 Recording Or Reproduction (AREA)
Abstract
(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.
Description
第１図は従来の光学ヘッドの構成を示す図、第２図は本
考案による光学ヘッドの構成を示す図である。
図に於て、１は半導体レーザ、２． ８． ８ａ。
８ｂはレーザ光、３，６．１１はレンズ、１２は円筒レ
ンズ、４は偏光ビーム・スプリッタ、５゜２０は鉛波長
板、７は媒体、９はビーム・スプリッタ、１０．１３は
分割ディテクタ、−２１は半透鏡である。FIG. 1 is a diagram showing the configuration of a conventional optical head, and FIG. 2 is a diagram showing the configuration of an optical head according to the present invention. In the figure, 1 is a semiconductor laser, 2. 8. 8a. 8b is a laser beam, 3, 6.11 is a lens, 12 is a cylindrical lens, 4 is a polarizing beam splitter, 5°20 is a lead wave plate, 7 is a medium, 9 is a beam splitter, 10.13 is a splitting detector, -21 is a semi-transparent mirror.
Claims (1)
・レンズ、偏光ビーム・スプリッタ、荷渡長板、対物レ
ンズを介して記録媒体のトラック上に微小スポットとし
て照射する照射系と、前記記録媒体から反射されて再び
前記対物レンズ誓波長板を通り、前記偏光ビーム・スプ
リッタにより取り出される反射光の一部を２分割ディテ
クタで受光し、残りの反射光は非点収差光学系を経て４
分割ディテクタで受光する受光系とを備えた光学ヘッド
において、前記偏光ビームのスプリッタにより取り出さ
れる反射光の光路中にも波長板収束レンズ、円筒レンズ
及び光軸に垂直な反射面を有する半透鏡を設置し、前記
半透鏡を透過するビームを受光するように媒体のトラッ
クに垂直な方向に２分割されたトラッキング・サーボ信
号用２分割ディテクタを設置し、前記半透鏡により反射
され再び光路を逆方向に進み、前記偏光ビーム・スプリ
ッタを透過した地点に生ずる前記円筒レンズの収束方向
及びそれに直交する方向でのビーム収束点の中間に、前
記円筒レンズの収束方向と４５０傾いた分割線を有する
フォーカシング・サーボ信号検出用４分割ディテクタを
設置したことを特徴とする光学ヘッド。An irradiation system that irradiates linearly polarized laser light from a semiconductor laser as a minute spot onto a track of a recording medium via a collimator lens, a polarizing beam splitter, a loading plate, and an objective lens, and a laser beam reflected from the recording medium. A part of the reflected light that passes through the objective lens wavelength plate again and is taken out by the polarizing beam splitter is received by a two-split detector, and the remaining reflected light passes through the astigmatism optical system.
In the optical head equipped with a light receiving system that receives light with a split detector, a wave plate converging lens, a cylindrical lens, and a semi-transparent mirror having a reflective surface perpendicular to the optical axis are also included in the optical path of the reflected light taken out by the polarized beam splitter. A two-split detector for tracking servo signals is installed in a direction perpendicular to the track of the medium so as to receive the beam transmitted through the semi-transparent mirror, and the beam is reflected by the semi-transparent mirror and redirects the optical path in the opposite direction. A focusing device having a dividing line inclined by 450 degrees with respect to the convergence direction of the cylindrical lens between the convergence direction of the cylindrical lens and the beam convergence point in the direction orthogonal to the convergence direction of the cylindrical lens, which occurs at the point where the beam passes through the polarizing beam splitter. An optical head characterized by being equipped with a four-part detector for detecting servo signals.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18040081U JPS5884632U (en) | 1981-12-03 | 1981-12-03 | optical head |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18040081U JPS5884632U (en) | 1981-12-03 | 1981-12-03 | optical head |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5884632U true JPS5884632U (en) | 1983-06-08 |
| JPS637949Y2 JPS637949Y2 (en) | 1988-03-09 |
Family
ID=29976956
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP18040081U Granted JPS5884632U (en) | 1981-12-03 | 1981-12-03 | optical head |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5884632U (en) |
-
1981
- 1981-12-03 JP JP18040081U patent/JPS5884632U/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS637949Y2 (en) | 1988-03-09 |
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