JPS641904A - Apparatus for measuring shape distortion - Google Patents

Apparatus for measuring shape distortion

Info

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
Application number
JP15704487A
Other languages
Japanese (ja)
Other versions
JPH011904A (en
Inventor
Yutaka Uemura
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nippon Columbia Co Ltd
Original Assignee
Nippon Columbia Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Nippon Columbia Co Ltd filed Critical Nippon Columbia Co Ltd
Priority to JP62-157044A priority Critical patent/JPH011904A/en
Priority claimed from JP62-157044A external-priority patent/JPH011904A/en
Publication of JPS641904A publication Critical patent/JPS641904A/en
Publication of JPH011904A publication Critical patent/JPH011904A/en
Pending legal-status Critical Current

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
JP62-157044A 1987-06-24 Shape distortion measuring device Pending JPH011904A (en)

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)

* Cited by examiner, † Cited by third party
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)

* Cited by examiner, † Cited by third party
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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