JPS641904A - Apparatus for measuring shape distortion - Google Patents
Apparatus for measuring shape distortionInfo
- Publication number
- JPS641904A JPS641904A JP15704487A JP15704487A JPS641904A JP S641904 A JPS641904 A JP S641904A JP 15704487 A JP15704487 A JP 15704487A JP 15704487 A JP15704487 A JP 15704487A JP S641904 A JPS641904 A JP S641904A
- Authority
- JP
- Japan
- Prior art keywords
- detectors
- error
- drive units
- error outputs
- rotary angle
- 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
Landscapes
- Length Measuring Devices By Optical Means (AREA)
- Investigating Materials By The Use Of Optical Means Adapted For Particular Applications (AREA)
- Manufacturing Optical Record Carriers (AREA)
Abstract
PURPOSE: To measure the amount of face deflection of mechanical characteristics of optical disk independently by feeding back the output of first and second irradiation position detectors to the first and second drive units, respectively.
CONSTITUTION: Since the irradiation position of reflected light 5a deviates if the face deflection ΔZ and warpage α are produced, the error outputs 7a and 7b become greater and the first and second drive units 8a and 8b always move in parallel the detectors 6a and 6b to the position of detectors 6a' and 6b' shown by dotted lines and at the same time rotate them for automatic control according to this error output level and polarity. The move distance land rotary angle β corresponding to various kinds of error outputs 7a and 7b using a reference disk ahead of time is measured to calculate the move distance l and rotary angle β for an unknown disk 2 from the error outputs 7a and 7b.
COPYRIGHT: (C)1989,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP62-157044A JPH011904A (en) | 1987-06-24 | Shape distortion measuring device |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP62-157044A JPH011904A (en) | 1987-06-24 | Shape distortion measuring device |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS641904A true JPS641904A (en) | 1989-01-06 |
JPH011904A JPH011904A (en) | 1989-01-06 |
Family
ID=
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2005022526A1 (en) * | 2003-08-27 | 2005-03-10 | Tdk Corporation | Warp angle measuring equipment and warp angle measuring method of optical recording medium |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2005022526A1 (en) * | 2003-08-27 | 2005-03-10 | Tdk Corporation | Warp angle measuring equipment and warp angle measuring method of optical recording medium |
US7668056B2 (en) | 2003-08-27 | 2010-02-23 | Tdk Corporation | Warpage angle measurement apparatus and warpage angle measurement method for optical recording medium |
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