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1、TECHNICAL REPORT ISO/IEC TR 13841 First edition 1995-07-01 Information technology - Guidance on measurement techniques for 90 mm optical disk cartridges Technologies de /information - Lignes directrices pour /es techniques de mesurage des cartouches de disque optique de diamktre 90 mm q m , Referenc
2、e number lSO/IEC TR 13841 :I 995(E) Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 04/04/2007 21:44:08 MDTNo reproduction or networking permitted without license from IHS -,-,- ISO/I
3、EC TR 13841:1995(E) Contents 1. General 1.1 Scope 1.2 Purpose 1.3 Reference 1.4 Definitions 2 Measurement environments 2.1 General 2.2 Measurement environment A 2.3 Measurement environments B 2.4 Measurement environment C 3 Measurement set up 3.1 General 3.2 Measurement accuracy 3.3 Calibration disk
4、 3.4 Measurement area 3.5 Reference Servo 4 Items for measurement techniques 4.1 General 4.2 List of measurement items 5 Measurement techniques 5.1 Shutter opening force 5.1.1 Definition 5.1.2 Measurement procedure 5.2 Clamping force 5.2.1 Introduction 5.2.2 Measurement procedure 5.3 Tilt 5.3.1 Intr
5、oduction 5.3.2 Measurement method 1 5.3.3 Measurement method 2 5.4 Axial and Radial acceleration 5.4.1 Introduction 5.4.2 Measurement system 5.4.3 Procedure 1: Low-pass measurement system 5.4.4 Procedure 2: High-pass Measurement System 5.4.5 Procedure 3: Total measurement system 5.5 Reflectance 3 3
6、3 3 3 3 4 4 4 4 4 4 5 5 7 7 7 7 8 9 14 0 ISO/IEC 1995 All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from the publish
7、er. ISO/IEC Copyright Office l Case postale 56 l CH-1211 Geneve 20 l Switzerland Printed in Switzerland ii Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 04/04/2007 21:44:08 MDTNo re
8、production or networking permitted without license from IHS -,-,- 0 IS0 ISOfiEC TR 13841: 1995(E) 5.6 Capture cylinder 5.7 Signals from grooves 5.7.1 Measurement equipment 5.7.2 Measurement conditions 5.7.3 Measuring procedure 5.8 Signals from headers 5.8.1 General 5.8.2 Amplitude measurement 5.9 Re
9、ad power 5.9.1 Definition 5.9.2 Measurement conditions 5.9.3 Measuring procedure 5.9.4 Analysis 5.10 Write power and erase power 5.10.1 Definition 5.10.2 Measurement conditions 5.10.3 Measuring procedure 5.10.4 Analysis 5.11 Imbalance of the magneto-optical signal 5.11.1 Measurement condition 5.11.2
10、 Measuring procedure 5.12 Narrow-Band Signal-to-Noise Ratio (NBSNR) 5.12.1 Definition 5.12.2 Measurement conditions 512.3 Measuring procedure Annexes A - The flow chart for determining write power and erase power B - Averaging Times and Spectrum Analyzer Data C - Measurement Frequency Point for Nois
11、e Level D - Notes on Measuring Noise Level E - Example of measurement procedure of signals from grooves F - The Measuring Method of The Capture Cylinder Radius for the Hub G - Better noise measurement with the HP3585A - type 2, when the subject is still under technical development or where for any o
12、ther reason there is the future but not immediate possibility of an agreement on an International Standard; - type 3, when a technical committee has collected data of a different kind from that which is normally published as an International Standard (“state of the art”, for example). Technical Repo
13、rts of types 1 and 2 are subject to review within three years of publication, to decide whether they can he transformed into International Standards. Technical Reports of type 3 do not necessarily have to be reviewed until the data they provide are considered to be no longer valid or useful. ISO/IEC
14、 TR 13841, which is a Technical Report of type 3, was prepared by Joint Technical Committee ISO/IEC JTC 1, Information technology. Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 04/0
15、4/2007 21:44:08 MDTNo reproduction or networking permitted without license from IHS -,-,- TECHNICAL REPORT 0 ISO/IEC ISO/IEC TR 13841:1995(E) Information technology - Guidance on measurement techniques for 90 mm optical disk cartridges 1 General 1.1 Scope This technical report provides Guidance on M
16、easurement Techniques for 90 mm Rewritable/Read-only Optical Disk Cartridges. 1.2 Purpose This technical report provides guidance on measurement techniques which are not well understood in industry. The basic concept of this report is to aid in the understanding of interchangeability between disks a
17、nd drives. This report gives guidance and provides some examples of measurement techniques to aid this understanding. 13 Reference ISO/IEC 10090: 1992, Information technology - 90 mm optical disk cartridges, rewritable and read only, for data interchange. 1.4 Definitions The definitions of this repo
18、rt are the same as the definitions of ISO/IEC 10090. 2 Measurement environments 2.1 General This report recommends 3 kinds of measurement environments. Each clause in section 5 may use 1 of 3 measurement environments as specified in this section. Basically, Measurement environment A is used for each
19、 clause in section 5 unless noted. Additional environments or conditions are recommended in each clause. 2.2 Measurement environment A Measurement environment A is the same as the testing environment of ISO/IEC 10090 i.e. temperature : 23 “C*2 “C relative humidity : 45% to 55% atmospheric pressure :
20、 60kPato 106kRa air cleanliness : Class 100 000 magnetic field strength : 32OOOA/mmax. 2.3 Measurement environments B Measurement environments B are used for the highest temperature marginal test temperature : 50 “C P/T = 6*SD/Tolerance Lens Movement I t I I I G3 I L- Actuator Compensator zI b.1. +
21、GI 1 + + t Sm 1 - l+Hs b t Low Pass Filter 6ooHz Error Sensor ea b - Se , l+Ha v- / Variable 1 +Hs Hi Pass Filter Gain Amp. 600Hz Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 04/04
22、/2007 21:44:08 MDTNo reproduction or networking permitted without license from IHS -,-,- ISOAEC TR 13841: 1995 (E) 01s0/IEc 1 65 $- oi I I - 1 2 B d I Figures 7,8 - Examples of l/(l+Hs) fllters for axial and radial use 12 Copyright International Organization for Standardization Provided by IHS under
23、 license with ISO Licensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 04/04/2007 21:44:08 MDTNo reproduction or networking permitted without license from IHS -,-,- 0 ISOAEC ISO/lEC TR 13841: 1995 (E) Frequency characteristics of l/(l+Hr) filter (Radial) -20 8 s -30 .- = -40 -50 -60
24、-70 -80 I I I I11111 0.01 0. 1 1 10 100 frequency (kHz) 20 -50 -60 -70 -80 Frequency characterietios of l/MM filter (Axial) -180 -360 -420 0.01 0. 1 1 10 100 frequency (kHz1 Figures 9,10 - Frequency characteristics of l/(l+Hs) filters 13 Copyright International Organization for Standardization Provi
25、ded by IHS under license with ISO Licensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 04/04/2007 21:44:08 MDTNo reproduction or networking permitted without license from IHS -,-,- ISO/lEC TR 13841: 1995 Q oIso/IEc 55 Reflectance Note: The value of baseline nflectance should exclude
26、the reflectance of disk surface. When tbc baseline reflectance is measured by Optical pick up i.e. with concentrated beam, the disk surface reflectance is small when the length of light pass of the Optical pick up is very large. Seefigure 11. 3. 2 0. 8 0 10 20 30 40 50 60 70 80 Distance between Obje
27、ctive lens and Photo detector mm Figure 11 - Reflectance from the disk surface 14 Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 04/04/2007 21:44:08 MDTNo reproduction or networking
28、permitted without license from IHS -,-,- 0 ISO/IEC ISO/IEC TR 13841: 1995 (E) 5.6 Capture cylinder Note: Capture Cylinder is a imaginary cylinder of the locus of the center of the hub. The basic concept of Capture Cylinder is not only used for the static but also for the dynamic situation. Especiall
29、y, when measuring R17, the following issues should be considered. i. Under operating conditions, the disk should be free from the case with the radial clearances between the disk and the case. ii. Difference of positions of the centers between the hub and the disks outer rim. iii. The tolerances of
30、the dimensions of the cartridge. (See annex F.) 5.7 Signals from grooves 5.7.1 Measurement equipment Figure 12 shows the test equipment for the measurements of signals from grooves. LPF means the low pass filter to eliminate the effect of modulation due to embossed marks. Figure 13 shows an example
31、of the circuit, which is a 4th order LPF with cut-off frequency 25OkHz and with an attenuation of 48 dB at 1 MHz. l /* means the dividing circuit to divide the filtered difference signal (11-12) by the filtered sum signal (11+12) at real time. The output gives the Divided push-pull signal containing
32、 embossed marks, the offset voltage in the input of the dividing circuit should be carefully eliminated to avoid a measurement error. Figure 14 shows an example of an actual dividing circuit. Connect a probe of an oscilloscope to the arrow to measure the signal denoted after the arrow. 5.7.2 Measure
33、ment conditions 1. Use measurement environment A (2.2) 2. Measuring area : See 3.4 5.7.3 Measuring procedure There are two methods to measure the signals from grooves i.e. (A) track jump method and (B) radial-track-servo-off method. (A) is better because of the ease to avoid the ID interference on t
34、he signals and because of the capability to measure in the case of less eccentricity. A. Track jump method 1. Position the focus beam on the destination track. 2. Connect oscilloscope (digital memory) probes to the (11+12)pp for Cross-track signal, (11+12)min for Cross-track minimum signal, (11 -12)
35、pp for Push-pull signal, (I l-12)/(11 +12)pp for Divided push-pull signal or Channel 1 output for On-track signal. 3. Jump to the neighboring track during the recording field period, ( not the ID period ), of a certain sector using the track jump function. 4. Measure the signal amplitude (for Cross-
36、track signal, Push-pull signal and divided push-pull signal) or the signal level (for Cross-track minimum signal and On-track signal). 5. Repeat the same measurements for the other sectors in a revolution. 6. Check whether the measured maximum and minimum values conform to the Standard. Notel: The m
37、easurements can be done in one revolution by jumping every sector with the direction changed every jump. This is useful as shown in figure 15. Note2: It is better to measure the reference signal (11+1) of the ungrooved area from ODF in the same sector. When tbe sum amplifier in the tracking channel
38、has less bandwidth to get the correct ODF level, the ODF level can be compensated using tbe signal IO in Channel 1. B. Radial-track-servo-off method 1. Position the focus beam at the destination radius. 2. Connect oscilloscope (digital memory) probes to the (11+12)pp for Cross-track signal, (11+12)m
39、in for Cross track minimum signal, (11-12) for Push-pull signal,(Il-12)/(11+12)pp for Divided push-pull signal or Ch.1 output for On-track signal. 15 Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=IHS Employees/1111111001, User=Wing, Bernie N
40、ot for Resale, 04/04/2007 21:44:08 MDTNo reproduction or networking permitted without license from IHS -,-,- ISO/IJX TR 13841: 1995 (E) 01s0/IEc 3. Store the signal waveforms from grooves obtained when the disk rotates in one turn with the track servo off. 4. Read the signal amplitudes (for Cross-tr
41、ack signal, Push-pull signal and Divided push-pull signal) or the signal levels (for Cross-track minimum signal and On-track signal) from the stored waveforms. For grooved areas without embossed Recording Fields, ID periods should be deleted from the stored signal trains to avoid the ID interference
42、. Note: The recommended example of the measurement procedure is shown in annex E 5.8 Signals from headers 5.8.1 General Signals from headers, Ivfo , Ism , Ihmm and IO, may vary along to radius or to tangential direction. Therefore, these signals should be measured for every sector in one track of th
43、e measurement area described in 3.4. 5.8.2 Amplitude measurement (1) Acquisition of header signals Store the header signal in the digital memory at the rate of about 20ns/sample. It is better to change the delay time from the trigger point to acquire the data according to the measured signal. (2) Pe
44、ak or bottom level The peak and bottom levels of sinusoidal waveforms can be obtained by taking value at the time when the 1st order difference of the input signal is zero. (3) VFO signal Ivfo The average value VFOp of all peaks of the sinusoidal waveform in the VFOl field and the average value VFOb
45、 of all bottoms are calculated. Ivfo (n) = VFOp - VFOb. In order to improve the reliability of the measured value of small VFO signals, repeat the measurement of the VFO signals 5 times and average the values. (4) Sector Mark Ism and ID Ihmax Calculate the Ism(n) and lhmm (n) from the difference wit
46、h the peak level and the average level of the neighboring bOttOmS. Put the minimum value of all Ism (n)s as Ism. Put the maximum value of all Ihma (n) as Ihmm (5) IO Acquire 32 times the data and take the average of these to eliminate noise. Determine the average level of the top ten levels in the M
47、irror mark field as IO. 16 Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 04/04/2007 21:44:08 MDTNo reproduction or networking permitted without license from IHS -,-,- 0 ISO/IEC ISO/
48、IEC TR 13841: 1995 (E) 1 12 1 LPF (I,- I, )PP 1 1 1 12 1 11+ I* ( 11+ I* , A LPF : -T-T&; (dB) 8: 8 10.00 dB B MAX 90.00 des . . 7. i$kEY 45.00 10.00 dB deg START STOP 1 000 10 000.000 000.000 Hz Hz Figure 13 - An example of a Low-pass-filter ( LPF ) 18 Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 04/04/2007 21:44:08 MDTNo reproduction or netw