JPS5875342U - Optical information reproducing device - Google Patents
Optical information reproducing deviceInfo
- Publication number
- JPS5875342U JPS5875342U JP16829581U JP16829581U JPS5875342U JP S5875342 U JPS5875342 U JP S5875342U JP 16829581 U JP16829581 U JP 16829581U JP 16829581 U JP16829581 U JP 16829581U JP S5875342 U JPS5875342 U JP S5875342U
- Authority
- JP
- Japan
- Prior art keywords
- light
- reproducing device
- optical information
- information reproducing
- receiving element
- 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 title claims description 6
- 238000010586 diagram Methods 0.000 description 6
- 238000001514 detection method Methods 0.000 description 1
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図は従来の光学式情報再生装置の一実施例を示す図
、第２図は同じ〈従来の光学式情報再生装置の一実施例
を示す丙、第３図はピットに対して読み取りスポットの
位置が変化した場合のレンズ面での回折パターンを表わ
す図、第４図は本考案による光学式情報再生装置の一実
施例を示す図、第５・１図および第５・２図は本考案に
よる光学式情報再生装置の受光素子面とスポットを表わ
す図、第６図は回折パターン説明図、第７、第８図は他
の構成説明図である。
１：収束レンズ、２：円筒レンズ、３：４分割受光素子
、４：回折格子、５：主ビーム、６：副ビーム、７：デ
ィスク、８：３分割受光素子、９：検出プリズム、１０
：対物レンズ、１１：ビット、１２：回折パターン、１
３：読取りスポット、１４：４角すい型プリズム、１５
：８分割受光素子、１６：スポット、１７：信号処理回
路。Fig. 1 is a diagram showing an embodiment of a conventional optical information reproducing device, Fig. 2 is the same (C showing an embodiment of a conventional optical information reproducing device), and Fig. 3 is a diagram showing a reading spot for a pit. Figure 4 is a diagram showing an embodiment of the optical information reproducing device according to the present invention, Figures 5.1 and 5.2 are diagrams showing the diffraction pattern on the lens surface when the position of FIG. 6 is an explanatory diagram of a diffraction pattern, and FIGS. 7 and 8 are explanatory diagrams of other configurations. 1: Converging lens, 2: Cylindrical lens, 3: 4-split light receiving element, 4: Diffraction grating, 5: Main beam, 6: Sub-beam, 7: Disk, 8: 3-split light receiving element, 9: Detection prism, 10
: Objective lens, 11: Bit, 12: Diffraction pattern, 1
3: Reading spot, 14: 4-cornered prism, 15
: 8-division light receiving element, 16: spot, 17: signal processing circuit.
Claims (1)
小スポットに収束させて情報トラックを有する記録担体
に照射し、記録担体からの反射ビームを受光素子に照射
して再生信号を得る光学式情報再生装置において、前記
記録担体からの反射ビームを４角すい型のプリズムで４
分割し、さらに収束レンズなどによって該受光素子上に
４つの微小なスポットにして照射し、および該受光素子
を少なくとも内側と外側の２領域に分割した受光面で構
成し、おおむね該受光面の分割境界線上に前記した４つ
の微小なスポットを生じるようにしたことを特徴とする
光学式情報再生装置。In an optical information reproducing device, a light beam emitted by a laser is converged into a minute spot by a converging lens and irradiated onto a record carrier having an information track, and a reflected beam from the record carrier is irradiated onto a light receiving element to obtain a reproduced signal. , the reflected beam from the record carrier is passed through a four-sided pyramidal prism.
The light-receiving element is divided into four small spots using a converging lens, etc., and the light-receiving element is divided into at least two areas, an inner and outer area, and the light-receiving surface is roughly divided. An optical information reproducing device characterized in that the four minute spots described above are generated on the boundary line.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16829581U JPS5875342U (en) | 1981-11-13 | 1981-11-13 | Optical information reproducing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16829581U JPS5875342U (en) | 1981-11-13 | 1981-11-13 | Optical information reproducing device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS5875342U true JPS5875342U (en) | 1983-05-21 |
Family
ID=29960347
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP16829581U Pending JPS5875342U (en) | 1981-11-13 | 1981-11-13 | Optical information reproducing device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5875342U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0997434A (en) * | 1995-09-29 | 1997-04-08 | Nec Corp | Optical head device |
-
1981
- 1981-11-13 JP JP16829581U patent/JPS5875342U/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0997434A (en) * | 1995-09-29 | 1997-04-08 | Nec Corp | Optical head device |
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