JPH0171631U - - Google Patents
Info
- Publication number
- JPH0171631U JPH0171631U JP1987166422U JP16642287U JPH0171631U JP H0171631 U JPH0171631 U JP H0171631U JP 1987166422 U JP1987166422 U JP 1987166422U JP 16642287 U JP16642287 U JP 16642287U JP H0171631 U JPH0171631 U JP H0171631U
- Authority
- JP
- Japan
- Prior art keywords
- angle
- magneto
- optical disk
- optical system
- adjustment mechanism
- 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 4
- 230000003287 optical effect Effects 0.000 claims 3
- 238000010586 diagram Methods 0.000 description 2
Landscapes
- Investigating Or Analysing Materials By Optical Means (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……角度調節機
構、１１１……歯車、１１２……パルスモータ、
１１３……駆動回路、１１４……保持回路、１１
５……スイツチ、１２……サーボ回路。
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, 6 1 , 6 2 ... Beam splitter, 6
3 ...Polarizing beam splitter, 7...1/2 wavelength plate, 81 , 82 ...Photodetector, 91,92 ...Amplifier, 10 ...Differential amplifier, 11...Angle adjustment mechanism , 11 1 ... gear, 11 2 ... pulse motor,
11 3 ... Drive circuit, 11 4 ... Holding circuit, 11
5 ...Switch, 12...Servo circuit.
Claims (1)
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、前記差動光
学系の前に挿入された１／２波長板と、この１／
２波長板を支持するとともにその角度の保持機能
を有する角度調節機構と、前記差動光学系の出力
を受けその出力における直流成分が所定の値とな
るように前記角度調節機構を駆動するサーボ回路
とを具備し、カー回転角の測定動作を行なう前に
前記サーボ回路を動作させて前記１／２波長板の
角度調節を行なうようにしてなる光磁気デイスク
検査装置。 A magneto-optical disk inspection device that measures the magnitude of the Kerr rotation angle of light reflected from a magneto-optical disk using a differential optical system, comprising: a 1/2 wavelength plate inserted in front of the differential optical system; This 1/
an angle adjustment mechanism that supports a two-wavelength plate and has a function of maintaining its angle; and a servo circuit that receives the output of the differential optical system and drives the angle adjustment mechanism so that a DC component in the output becomes a predetermined value. 1. A magneto-optical disk inspection apparatus, comprising: operating the servo circuit to adjust the angle of the half-wave plate before measuring the Kerr rotation angle.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1987166422U JPH0171631U (en) | 1987-10-30 | 1987-10-30 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1987166422U JPH0171631U (en) | 1987-10-30 | 1987-10-30 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0171631U true JPH0171631U (en) | 1989-05-12 |
Family
ID=31453788
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1987166422U Pending JPH0171631U (en) | 1987-10-30 | 1987-10-30 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0171631U (en) |
-
1987
- 1987-10-30 JP JP1987166422U patent/JPH0171631U/ja active Pending
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