JPH03128803U - - Google Patents
Info
- Publication number
- JPH03128803U JPH03128803U JP3808690U JP3808690U JPH03128803U JP H03128803 U JPH03128803 U JP H03128803U JP 3808690 U JP3808690 U JP 3808690U JP 3808690 U JP3808690 U JP 3808690U JP H03128803 U JPH03128803 U JP H03128803U
- Authority
- JP
- Japan
- Prior art keywords
- optical disk
- scale
- measuring device
- diffracted light
- guide groove
- 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 description 11
- 238000003384 imaging method Methods 0.000 claims 2
- 238000010586 diagram Methods 0.000 description 3
- 238000005259 measurement Methods 0.000 description 1
Landscapes
- Length Measuring Devices By Optical Means (AREA)
- Manufacturing Optical Record Carriers (AREA)
Description
第１図は本考案に係る偏心量測定装置の一例を
示す説明図、第２図は光デイスクの要部斜視断面
図、第３図はスケールの一例を示す平面図、第４
図は偏心量測定の原理を示す説明図、第５図は本
考案の他の例を示す説明図である。
１……光デイスク、２……駆動部、３……光源
、４……光ビーム、５……回折光、６……結像面
、７……レンズ系、８……スケール。
FIG. 1 is an explanatory diagram showing an example of an eccentricity measuring device according to the present invention, FIG. 2 is a perspective cross-sectional view of a main part of an optical disk, FIG. 3 is a plan view showing an example of a scale, and FIG.
The figure is an explanatory diagram showing the principle of eccentricity measurement, and FIG. 5 is an explanatory diagram showing another example of the present invention. DESCRIPTION OF SYMBOLS 1... Optical disk, 2... Drive unit, 3... Light source, 4... Light beam, 5... Diffracted light, 6... Image forming surface, 7... Lens system, 8... Scale.
Claims (1)
イスクに光ビームを照射する光源と、光デイスク
に形成された案内溝による回折光を集光し、案内
溝及び非溝部の回折像を結像面に結像させるレン
ズ系と、前記結像面に設けられた偏心量測定用の
スケールとを備えることを特徴とする光デイスク
の偏心量測定装置。 (2) 請求項１記載において、前記案内溝による
回折光のうち、１次回折光のみを前記レンズ系に
て集光するようにしたことを特徴とする光デイス
クの偏心量測定装置。 (3) 請求項１または２記載において、測定しよ
うとする回折光の光軸が前記光デイスクに対して
垂直になるように、前記光源を配置したことを特
徴とする光デイスクの偏心量測定装置。 (4) 請求項１記載において、前記スケールとし
て等間隔の目盛が付された物理算術スケールを備
えたことを特徴とする光デイスクの偏心量測定装
置。 (5) 請求項１記載において、前記スケールとし
てラインセンサを備えたことを特徴とする光デイ
スクの偏心量測定装置。[Scope of Claim for Utility Model Registration] (1) A drive unit that rotationally drives the optical disk, a light source that irradiates a light beam onto the optical disk, and a guide groove that collects diffracted light from a guide groove formed on the optical disk. and a lens system for forming a diffraction image of the non-groove portion on an imaging surface, and a scale for measuring the eccentricity provided on the imaging surface. (2) The optical disk eccentricity measuring device according to claim 1, wherein of the diffracted light by the guide groove, only the first-order diffracted light is focused by the lens system. (3) The optical disk eccentricity measuring device according to claim 1 or 2, wherein the light source is arranged so that the optical axis of the diffracted light to be measured is perpendicular to the optical disk. . (4) The optical disk eccentricity measuring device according to claim 1, characterized in that the scale is a physical arithmetic scale having graduations at equal intervals. (5) The optical disk eccentricity measuring device according to claim 1, further comprising a line sensor as the scale.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3808690U JPH03128803U (en) | 1990-04-11 | 1990-04-11 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3808690U JPH03128803U (en) | 1990-04-11 | 1990-04-11 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH03128803U true JPH03128803U (en) | 1991-12-25 |
Family
ID=31545779
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3808690U Pending JPH03128803U (en) | 1990-04-11 | 1990-04-11 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH03128803U (en) |
-
1990
- 1990-04-11 JP JP3808690U patent/JPH03128803U/ja active Pending
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