JPS6077022U - Focus error detection device - Google Patents
Focus error detection deviceInfo
- Publication number
- JPS6077022U JPS6077022U JP16955283U JP16955283U JPS6077022U JP S6077022 U JPS6077022 U JP S6077022U JP 16955283 U JP16955283 U JP 16955283U JP 16955283 U JP16955283 U JP 16955283U JP S6077022 U JPS6077022 U JP S6077022U
- Authority
- JP
- Japan
- Prior art keywords
- focus error
- light receiving
- light
- error detection
- receiving means
- 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
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図は従来例を示す構成図、第２図は本考案 −の
一実施例を示す構成図、第３図は合焦状態における動作
説明図、第４図は記録媒体と対物レンズとの距離が合焦
状態より短かい場合の動作説明図、第５図は前記距離が
合焦状態より長い場合の動作説明図である。
主要部分の符号の説明、１・・・光源、３・・・ハーフ
ミラ−１４・・・対物レンズ、５・・・記録媒体、８・
・・光検出器、９・・・光学部品。Fig. 1 is a block diagram showing a conventional example, Fig. 2 is a block diagram showing an embodiment of the present invention, Fig. 3 is an explanatory diagram of the operation in the focused state, and Fig. 4 is a diagram showing the relationship between the recording medium and the objective lens. FIG. 5 is an explanatory diagram of the operation when the distance is shorter than the in-focus state, and FIG. 5 is an explanatory diagram of the operation when the distance is longer than the in-focus state. Explanation of symbols of main parts, 1... Light source, 3... Half mirror 14... Objective lens, 5... Recording medium, 8...
...Photodetector, 9...Optical component.
Claims (1)
める第１の光学系と、受光手段と、該記録面を経た光束
を前記受光手段の受光面に非点光束形態で導く第２の光
学系とを備え、前記受光手段の出力に基づいて焦点誤差
信号を導出するようになされた焦点誤差検出装着であっ
て、前記第２の光学系は集光面と一方向集光作用面とを
前後に有しかつ前記受光手段の前に配置された光学部品
を備えたことを特徴とする焦点誤差検出装置。a first optical system that converges and irradiates a light beam from a light source onto an information recording surface of a recording medium; a light receiving means; and a second optical system that guides the light beam that has passed through the recording surface to the light receiving surface of the light receiving means in an astigmatic form. and a focus error detection system configured to derive a focus error signal based on the output of the light receiving means, wherein the second optical system includes a light condensing surface and a unidirectional light condensing surface. What is claimed is: 1. A focus error detection device comprising: an optical component having front and rear optical components disposed in front of the light receiving means.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16955283U JPS6077022U (en) | 1983-11-01 | 1983-11-01 | Focus error detection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16955283U JPS6077022U (en) | 1983-11-01 | 1983-11-01 | Focus error detection device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS6077022U true JPS6077022U (en) | 1985-05-29 |
Family
ID=30370388
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP16955283U Pending JPS6077022U (en) | 1983-11-01 | 1983-11-01 | Focus error detection device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6077022U (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5285801A (en) * | 1975-12-31 | 1977-07-16 | Thomson Brandt | Device for correcting focusing error of optical reproducer |
| JPS5317705A (en) * | 1976-08-02 | 1978-02-18 | Hitachi Ltd | Automatic focusing system |
-
1983
- 1983-11-01 JP JP16955283U patent/JPS6077022U/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5285801A (en) * | 1975-12-31 | 1977-07-16 | Thomson Brandt | Device for correcting focusing error of optical reproducer |
| JPS5317705A (en) * | 1976-08-02 | 1978-02-18 | Hitachi Ltd | Automatic focusing system |
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