JPH01117737U - - Google Patents
Info
- Publication number
- JPH01117737U JPH01117737U JP1032888U JP1032888U JPH01117737U JP H01117737 U JPH01117737 U JP H01117737U JP 1032888 U JP1032888 U JP 1032888U JP 1032888 U JP1032888 U JP 1032888U JP H01117737 U JPH01117737 U JP H01117737U
- Authority
- JP
- Japan
- Prior art keywords
- magneto
- optical disk
- sum
- signal
- disk inspection
- 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
- 238000007689 inspection Methods 0.000 claims description 5
- 230000003287 optical effect Effects 0.000 claims 2
- 230000010287 polarization Effects 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 2
Landscapes
- Investigating Or Analysing Materials By Optical Means (AREA)
- Testing Of Optical Devices Or Fibers (AREA)
Description
第１図は本考案の光磁気デイスク検査装置の一
実施例を示す構成図、第２図は従来の光磁気デイ
スク検査装置の一例を示す構成図である。
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、１１……加算アンプ
、１２……割算器、１３……演算回路、１４……
増幅器。
FIG. 1 is a block diagram showing an embodiment of a magneto-optical disk inspection apparatus of the present invention, and FIG. 2 is a block diagram showing an example of a conventional magneto-optical disk inspection 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, 11... Summing amplifier, 12... Division Calculator, 13... Arithmetic circuit, 14...
amplifier.
Claims (1)
回転角の大きさを差動光学系により測定するよう
にした光磁気デイスク検査装置において、直交す
る偏光成分の光強度に比例した各光検出器の出力
信号を受けその差および和を求めるとともにこの
差信号を和信号により割り算する演算回路と、こ
の演算回路の出力を所定のゲインおよびオフセツ
トをもつて増幅する増幅器とを具備してなる光磁
気デイスク検査装置。 (2) 前記和信号の代りにサーボ光学系において
サーボエラーを検出するフオトダイオードの出力
の総和を利用するようにしてなる請求項１に記載
の光磁気デイスク検査装置。[Claims for Utility Model Registration] (1) In a magneto-optical disk inspection device that uses a differential optical system to measure the magnitude of the Kerr rotation angle in light reflected from a magneto-optical disk, the light intensity of orthogonal polarization components an arithmetic circuit that receives the output signal of each photodetector proportional to , calculates the difference and sum thereof, and divides this difference signal by the sum signal; and an amplifier that amplifies the output of this arithmetic circuit with a predetermined gain and offset. A magneto-optical disk inspection device comprising: (2) The magneto-optical disk inspection apparatus according to claim 1, wherein the sum of outputs of photodiodes for detecting servo errors in the servo optical system is used instead of the sum signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1032888U JPH01117737U (en) | 1988-01-28 | 1988-01-28 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1032888U JPH01117737U (en) | 1988-01-28 | 1988-01-28 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH01117737U true JPH01117737U (en) | 1989-08-09 |
Family
ID=31217892
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1032888U Pending JPH01117737U (en) | 1988-01-28 | 1988-01-28 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH01117737U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1999030132A1 (en) * | 1997-12-09 | 1999-06-17 | Matsushita Electric Industrial Co., Ltd. | Angle-of-rotation measuring instrument urine analysis method |
-
1988
- 1988-01-28 JP JP1032888U patent/JPH01117737U/ja active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1999030132A1 (en) * | 1997-12-09 | 1999-06-17 | Matsushita Electric Industrial Co., Ltd. | Angle-of-rotation measuring instrument urine analysis method |
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