JPH0197423U - - Google Patents
Info
- Publication number
- JPH0197423U JPH0197423U JP19365987U JP19365987U JPH0197423U JP H0197423 U JPH0197423 U JP H0197423U JP 19365987 U JP19365987 U JP 19365987U JP 19365987 U JP19365987 U JP 19365987U JP H0197423 U JPH0197423 U JP H0197423U
- Authority
- JP
- Japan
- Prior art keywords
- magneto
- optical disk
- reflected
- beam splitter
- reflected light
- 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 1
- 238000010586 diagram Methods 0.000 description 3
Landscapes
- Optical Head (AREA)
Description
第１図は本考案の光磁気デイスク再生装置の一
実施例を示す構成図、第２図〜第４図は従来の光
磁気デイスク再生装置の一例を示す構成図および
その動作波形図である。
１……光磁気デイスク、２……レーザ光源、３
……コリメータレンズ、４……ミラー、５……対
物レンズ、６１，６２……ビームスプリツタ、６
３……偏光ビームスプリツタ、７……１／２波長
板、８１，８２……光検出器、９１，９２……ア
ンプ、１０……差動アンプ。
FIG. 1 is a block diagram showing one embodiment of a magneto-optical disk reproducing apparatus of the present invention, and FIGS. 2 to 4 are block diagrams and operational waveform diagrams showing an example of a conventional magneto-optical disk reproducing apparatus. 1... magneto-optical disk, 2... laser light source, 3
... Collimator lens, 4 ... Mirror, 5 ... Objective lens, 61, 62 ... Beam splitter, 6
3...Polarizing beam splitter, 7...1/2 wavelength plate, 81, 82... Photodetector, 91, 92... Amplifier, 10... Differential amplifier.
Claims (1)
角の大きさを差動光学系により検出するようにし
た光磁気デイスク再生装置において、カ―回転角
の影響を受けない状態での反射光における直線偏
光の方位に対して透過する偏光成分の方位および
反射する偏光成分の方位がそれぞれ４５°の角度
を持つように配置された偏光ビームスプリツタと
、この偏光ビームスプリツタにより分離された反
射光をそれぞれ受光する２つの光検出器と、これ
らの光検出器の出力の差を求める差動アンプとを
具備してなる光磁気デイスク再生装置。 In a magneto-optical disk playback device that uses a differential optical system to detect the magnitude of the Kerr rotation angle in the reflected light from the magneto-optical disk, linearly polarized light in the reflected light is detected without being affected by the Kerr rotation angle. A polarizing beam splitter is arranged so that the direction of the transmitted polarized light component and the direction of the reflected polarized light component each have an angle of 45 degrees with respect to the direction of , and the reflected light separated by this polarized beam splitter is A magneto-optical disk reproducing device comprising two photodetectors that receive light and a differential amplifier that determines the difference between the outputs of these photodetectors.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP19365987U JPH0197423U (en) | 1987-12-21 | 1987-12-21 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP19365987U JPH0197423U (en) | 1987-12-21 | 1987-12-21 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0197423U true JPH0197423U (en) | 1989-06-28 |
Family
ID=31484440
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP19365987U Pending JPH0197423U (en) | 1987-12-21 | 1987-12-21 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0197423U (en) |
-
1987
- 1987-12-21 JP JP19365987U patent/JPH0197423U/ja active Pending
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