JPS5945733U - Optical pickup focus detection device - Google Patents
Optical pickup focus detection deviceInfo
- Publication number
- JPS5945733U JPS5945733U JP14165482U JP14165482U JPS5945733U JP S5945733 U JPS5945733 U JP S5945733U JP 14165482 U JP14165482 U JP 14165482U JP 14165482 U JP14165482 U JP 14165482U JP S5945733 U JPS5945733 U JP S5945733U
- Authority
- JP
- Japan
- Prior art keywords
- peripheral part
- detection device
- optical pickup
- focus detection
- focused
- 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) [Abstract] This bulletin contains application data before electronic filing, so abstract data is not recorded.
Description
第１図は従来の光ピツクアップのフォーカス検出装置の
構成を示す図、第２図は同、ディテクタの構造を示す図
、第３図は同、フォーカスエラー信号の特性図、第４図
は本考案のフォーカス検出装置の構成を示す図、第５図
は同、ディテクタの構造を示す図、第６図は同、フォー
カスエラー信号の特性図である。
１はレーザ、３はビームスプリッタ、４は１７４波長板
、５は対物レンズ、６はディスク、１２はディテクタ、
１２ａは同内周部、１２ｂは同外周部である。
第５図Figure 1 is a diagram showing the configuration of a conventional optical pickup focus detection device, Figure 2 is a diagram showing the structure of a detector, Figure 3 is a characteristic diagram of a focus error signal, and Figure 4 is a diagram of the present invention. FIG. 5 is a diagram showing the structure of the detector, and FIG. 6 is a characteristic diagram of the focus error signal. 1 is a laser, 3 is a beam splitter, 4 is a 174 wavelength plate, 5 is an objective lens, 6 is a disk, 12 is a detector,
12a is the same inner peripheral part, and 12b is the same outer peripheral part. Figure 5
Claims (1)
板４、対物レンズ５を通してディスク６の信号ピット面
に集束させるようにした光ピツクアップにおいて、上記
ディスク６の信号ピット面で反射された反射ビームを対
物レンズ５．１７４波長板４、ビームスプリッタ３を通
して円形状内周部１２ａと当該内周部に外接するリング
状外周部１２ｂとからなる２分割ディテクタ１２に集束
させ、当該ディテクタ１２の内周部１２ａ１外周部１２
ｂそれぞれの出力電圧の比較差出力電圧をフォーカスエ
ラー信号とすることを特徴とするフォーカス検出装置。In an optical pickup in which a beam from a laser 1 is focused on a signal pit surface of a disk 6 through a beam splitter 3, a wavelength plate 4, and an objective lens 5, the reflected beam reflected from the signal pit surface of the disk 6 is focused. Through the objective lens 5.174 wavelength plate 4 and beam splitter 3, the beam is focused on a two-part detector 12 consisting of a circular inner peripheral part 12a and a ring-shaped outer peripheral part 12b circumscribing the inner peripheral part. 12a1 outer peripheral part 12
A focus detection device characterized in that a comparison difference output voltage between the respective output voltages is used as a focus error signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14165482U JPS5945733U (en) | 1982-09-18 | 1982-09-18 | Optical pickup focus detection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14165482U JPS5945733U (en) | 1982-09-18 | 1982-09-18 | Optical pickup focus detection device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS5945733U true JPS5945733U (en) | 1984-03-27 |
Family
ID=30316761
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP14165482U Pending JPS5945733U (en) | 1982-09-18 | 1982-09-18 | Optical pickup focus detection device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5945733U (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS55125547A (en) * | 1979-03-19 | 1980-09-27 | Matsushita Electric Ind Co Ltd | Light detecting unit |
-
1982
- 1982-09-18 JP JP14165482U patent/JPS5945733U/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS55125547A (en) * | 1979-03-19 | 1980-09-27 | Matsushita Electric Ind Co Ltd | Light detecting unit |
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