JPH0380526U - - Google Patents
Info
- Publication number
- JPH0380526U JPH0380526U JP13948489U JP13948489U JPH0380526U JP H0380526 U JPH0380526 U JP H0380526U JP 13948489 U JP13948489 U JP 13948489U JP 13948489 U JP13948489 U JP 13948489U JP H0380526 U JPH0380526 U JP H0380526U
- Authority
- JP
- Japan
- Prior art keywords
- recording
- optical
- optical head
- reproducing
- beams
- 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.)
- Pending
Links
- 230000003287 optical effect Effects 0.000 claims description 12
- 238000001514 detection method Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000007493 shaping process Methods 0.000 description 1
Landscapes
- Optical Recording Or Reproduction (AREA)
Description
第１図は本考案の回折素子の駆動機構を示す図
、第２図は従来の光磁気方式光ヘツドの基本構成
を示す光学ブロツク図、第３図は３ビーム方式に
よる光学系の基本構成を示す光学系ブロツク図。
１…光源、２…整形プリズム、３…回折素子、
７…対物レンズ、１５…トラツキング誤差検出用
光検出器（２分割）、１６…フオーカス誤差検出
用光検出器（６分割）。
Figure 1 shows the drive mechanism of the diffraction element of the present invention, Figure 2 is an optical block diagram showing the basic configuration of a conventional magneto-optical optical head, and Figure 3 shows the basic configuration of a three-beam optical system. FIG. 2 is a block diagram of the optical system shown. 1... Light source, 2... Shaping prism, 3... Diffraction element,
7...Objective lens, 15...Photodetector for tracking error detection (2 divisions), 16...Photodetector for focusing error detection (6 divisions).
Claims (1)
用光ヘツドであつて、記録時の光学系は１ビーム
でデイスクに収束光を照射し、１ビームのトラツ
クエラー信号の検出を行い、再生時には３ビーム
の収束光がデイスクに照射し、３ビームのトラツ
クエラーの検出を行う事を特徴とする記録再生用
光ヘツド。 (2) ３ビーム発生用の回折光学素子を記録時に
は光路中から除かれ、１ビーム光学系とし、再生
時には、回折素子を光路中に移動させ、所定の位
置に固定する請求項１記載の記録再生用光ヘツド
。[Claims for Utility Model Registration] (1) An optical head for recording and reproducing that records and reproduces signals using light, in which the optical system during recording irradiates a disc with convergent light in one beam; An optical head for recording and reproducing, which detects a track error signal, irradiates a disk with three beams of convergent light during reproduction, and detects a three-beam track error. (2) The recording according to claim 1, wherein the diffractive optical element for generating three beams is removed from the optical path during recording to form a one-beam optical system, and during reproduction, the diffractive element is moved into the optical path and fixed at a predetermined position. Optical head for playback.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13948489U JPH0380526U (en) | 1989-11-30 | 1989-11-30 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13948489U JPH0380526U (en) | 1989-11-30 | 1989-11-30 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0380526U true JPH0380526U (en) | 1991-08-19 |
Family
ID=31686525
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP13948489U Pending JPH0380526U (en) | 1989-11-30 | 1989-11-30 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0380526U (en) |
-
1989
- 1989-11-30 JP JP13948489U patent/JPH0380526U/ja active Pending
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