JPS58140522U - Defocus detection device - Google Patents
Defocus detection deviceInfo
- Publication number
- JPS58140522U JPS58140522U JP3440782U JP3440782U JPS58140522U JP S58140522 U JPS58140522 U JP S58140522U JP 3440782 U JP3440782 U JP 3440782U JP 3440782 U JP3440782 U JP 3440782U JP S58140522 U JPS58140522 U JP S58140522U
- Authority
- JP
- Japan
- Prior art keywords
- light
- irradiated object
- pair
- lens system
- detection device
- 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図は従来の焦点ずれ検出装置を示す図、第２図は本
発明による焦点ずれ検出装置の一実施例を示す因、第３
図は導波素子の導波機構を説明するための図である。
図に於て、１は半導体レーザ、２． ８． １０゜３３
はレーザ光、３，６はレンズ、４は偏光ビーム・スプリ
ッタ、５は入ハ波長板、７はディスク状媒体、８ａは光
軸、９はプリズム、９ａは反射面、３１はコア、３２は
クラッド、２０ａ。
２０ｂは導波素子である。FIG. 1 shows a conventional defocus detection device, FIG. 2 shows an embodiment of the defocus detection device according to the present invention, and FIG.
The figure is a diagram for explaining the waveguide mechanism of the waveguide element. In the figure, 1 is a semiconductor laser, 2. 8. 10°33
is a laser beam, 3 and 6 are lenses, 4 is a polarizing beam splitter, 5 is an input wavelength plate, 7 is a disk-shaped medium, 8a is an optical axis, 9 is a prism, 9a is a reflective surface, 31 is a core, and 32 is a Clad, 20a. 20b is a waveguide element.
Claims (1)
束するレンズ系と、前記レンズ系の途中に挿入され前記
被照射物体からの反射光を取り出すための光分割素子と
、前記光分割素子により取り出される前記被照射物体か
らの反射光の中心光軸を含む面内で前記中心光軸につい
て対称な位置に所定の角度だけ同一方向に入射面を傾け
て設置した少なくとも１対の受光角制限を有する導波素
子と、前記導波素子の出射光を受光する少なくとも１対
の光検知器とから成り、前記中なくとも１対の光検知器
の差動出力より前記レンズ系の前記被照射物体への焦点
ずれを検出するように構成した事を特徴とする焦点ずれ
検出装置。a light source, a lens system that focuses the light emitted from the light source onto the irradiated object, a light splitting element inserted in the middle of the lens system to extract the reflected light from the irradiated object, and the light splitting element. At least one pair of light receiving angles installed at symmetrical positions with respect to the central optical axis within a plane including the central optical axis of the reflected light from the irradiated object extracted by the element, with the incident surfaces tilted in the same direction by a predetermined angle. It consists of a waveguide element having a limit and at least one pair of photodetectors that receive light emitted from the waveguide element, and the differential output of the at least one pair of photodetectors is used to detect the target of the lens system. A defocus detection device characterized in that it is configured to detect defocus on an irradiated object.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3440782U JPS58140522U (en) | 1982-03-11 | 1982-03-11 | Defocus detection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3440782U JPS58140522U (en) | 1982-03-11 | 1982-03-11 | Defocus detection device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS58140522U true JPS58140522U (en) | 1983-09-21 |
| JPS637950Y2 JPS637950Y2 (en) | 1988-03-09 |
Family
ID=30045890
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3440782U Granted JPS58140522U (en) | 1982-03-11 | 1982-03-11 | Defocus detection device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS58140522U (en) |
-
1982
- 1982-03-11 JP JP3440782U patent/JPS58140522U/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS637950Y2 (en) | 1988-03-09 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US4542492A (en) | Optical head in a recording and reading device for a data carrier | |
| JPS5753831A (en) | Method and device for reproduction of optical information | |
| JPS5753832A (en) | Method and device for recording of optical information | |
| KR900018925A (en) | Wedge Prism Assembly for Optical Information Storage | |
| JP2846820B2 (en) | Rough astigmatic lens for detecting focus error in optical pickup system | |
| JPH0478029A (en) | Optical information recording and reproducing device | |
| JPS58140522U (en) | Defocus detection device | |
| JPS5746334A (en) | Optical information reproducer | |
| US5438562A (en) | Optical head for recording and/or reproducing information on and/or from opto-magnetic record medium | |
| JPH07182666A (en) | Light pickup system | |
| JPS62196880A (en) | Semiconductor laser device | |
| JPH0328401Y2 (en) | ||
| KR950000894B1 (en) | Focus error retesting method for optical disk driver | |
| JPS60135818U (en) | Focus error detection device | |
| JP2748052B2 (en) | Light separation element and light receiving optical device using the same | |
| JPS5733443A (en) | Focus detector | |
| JPS6148428U (en) | ||
| JPS58193334U (en) | light pick up | |
| JPH0296629U (en) | ||
| JPS6111943A (en) | Focus error detector | |
| JPS5814234U (en) | Optical pickup device | |
| JPS62147128U (en) | ||
| JPS5814236U (en) | optical pickup device | |
| JPH04172626A (en) | Optical pickup | |
| JPS6256582B2 (en) |