JPS6453105A - Measuring instrument for reflecting surface shape of optical disk - Google Patents

Measuring instrument for reflecting surface shape of optical disk

Info

Publication number
JPS6453105A
JPS6453105A JP20944387A JP20944387A JPS6453105A JP S6453105 A JPS6453105 A JP S6453105A JP 20944387 A JP20944387 A JP 20944387A JP 20944387 A JP20944387 A JP 20944387A JP S6453105 A JPS6453105 A JP S6453105A
Authority
JP
Japan
Prior art keywords
reflecting surface
optical disk
error signal
groove
tracking error
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
JP20944387A
Other languages
Japanese (ja)
Inventor
Shuzo Mizutani
Yumiko Watanabe
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.)
Brother Industries Ltd
Original Assignee
Brother Industries 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 Brother Industries Ltd filed Critical Brother Industries Ltd
Priority to JP20944387A priority Critical patent/JPS6453105A/en
Publication of JPS6453105A publication Critical patent/JPS6453105A/en
Pending legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/84—Systems specially adapted for particular applications
    • G01N21/88—Investigating the presence of flaws or contamination
    • G01N21/95—Investigating the presence of flaws or contamination characterised by the material or shape of the object to be examined
    • G01N21/9506—Optical discs

Abstract

PURPOSE:To easily calculate the uneven shape size of the surface of the disk by calculating the uneven shape by a calculating means according to a tracking error signal outputted by an optical pick-up which converges irradiation light on the reflecting surface of the optical disk and collects reflected light from the reflecting surface. CONSTITUTION:The tracking error signal ST outputted by the optical pickup 22 contains information on the relative position shift between the convergence point of the optical pickup 22 and the land part 24 of the optical disk 10 and the uneven shape size of the reflecting surface such as the width of the and part 24, the width of a groove 26, the width ratio of the land part 24 and groove 26, track pitch, and the depth of the groove 26 is calculated over the entire circumference according to the peak-to-peak values (a) and (b) and amplitude values (c) and (d) of the tracking error signal ST. Therefore, when this measuring instrument is used, it is fitted on the rotary shaft 16 of the rotary driving deice 14 for the optical disk 10 and the optical pickup 22 is only put in reciprocal movement by vibration, thereby eliminating the need for expensive facilities.
JP20944387A 1987-08-24 1987-08-24 Measuring instrument for reflecting surface shape of optical disk Pending JPS6453105A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP20944387A JPS6453105A (en) 1987-08-24 1987-08-24 Measuring instrument for reflecting surface shape of optical disk

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP20944387A JPS6453105A (en) 1987-08-24 1987-08-24 Measuring instrument for reflecting surface shape of optical disk

Publications (1)

Publication Number Publication Date
JPS6453105A true JPS6453105A (en) 1989-03-01

Family

ID=16572946

Family Applications (1)

Application Number Title Priority Date Filing Date
JP20944387A Pending JPS6453105A (en) 1987-08-24 1987-08-24 Measuring instrument for reflecting surface shape of optical disk

Country Status (1)

Country Link
JP (1) JPS6453105A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2006030664A1 (en) * 2004-09-13 2006-03-23 Kyoto University Noncontact method for measuring pitch of gear teeth and screw
US10344631B2 (en) 2015-07-23 2019-07-09 Husco Automotive Holdings Llc Mechanical cam phasing systems and methods

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2006030664A1 (en) * 2004-09-13 2006-03-23 Kyoto University Noncontact method for measuring pitch of gear teeth and screw
US10344631B2 (en) 2015-07-23 2019-07-09 Husco Automotive Holdings Llc Mechanical cam phasing systems and methods

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