Optical information processing apparatus and optical information processing method, and ...

44 Pages·2015·3.81 MB·English

US 20140355403A1
(19) United States
(12) Patent Application Publication (10) Pub. No.: US 2014/0355403 A1
Kishigami et al. (43) Pub. Date: Dec. 4, 2014
(54) OPTICAL INFORMATION PROCESSING Publication Classi?cation
APPARATUS AND OPTICAL INFORMATION
PROCESSING METHOD, AND ADJUSTMENT (51) Int- Cl
DEVICE, ADJUSTMENT METHOD, AND GIIB 7/1392 (2006-01)
ADJUSTMENT PROGRAM FOR OPTICAL GIIB 7/1398 (2006.01)
INFORMATION PROCESSING APPARATUS (52) US. Cl.
CPC ........ .. GIIB 7/13925 (2013.01); GIIB 7/1398
(71) Applicant: Mitsubishi Electric Corporation, (201301)
Chiyoda-ku, Tokyo (JP) USPC ..................................................... .. 369/47.49
(72) Inventors: Tomo Kishigami, Tokyo (JP); Nobuo (57) ABSTRACT
TakeShlta’ TOkyO (JP) An optical information processing apparatus includes: a unit
that radiates light onto an optical disc and detects the re?ected
(73) Assignee: MITSUBISHI ELECTRIC light to output a reproduced signal; a unit that corrects spheri
CORPORATION, Tokyo (JP) cal aberration of the light; a unit that adjusts a focus position
of the light based on a focus adjustment value; and an adjust
(21) APP1- NOJ 14/374,866 ment unit that measures a characteristic of the reproduced
signal at each of at least three positions on each of at least
(22) PCT Filed: Feb- 21: 2013 three straight lines on a plane With coordinate axes represent
ing an amount of spherical aberration correction and focus
(86) PCT NO': PCT/JP2013/054273 adjustment value, obtains, from the measurements, as esti
§ 371 (OX1), mated positions, at least ?ve positions on the plane at Which
(2), (4) Date; JUL 25, 2014 the characteristic has substantially the same value, performs
an ellipse approximation on the estimated positions, obtains a
(30) Foreign Application Priority Data center of the ellipse, and determines the amount of spherical
aberration correction and focus adjustment value based on the
Mar. 22, 2012 (JP) ............................... .. 2012-065713 center of the ellipse.
OPTICAL INFORMATION PROCESSING APPARATUS
240~ BUFFER MEMORY
# HEAD AMPLIFIER ¢~~ 110 20L I»
> CPU 210
REPRODUCED SIGNAL $120
RECEIVING PROCESSING UNIT 321 ROM L 220
ELEMENT I '
j ‘ SIGNAL QUALITY RAM A 230
320 3 MEASUREMENT UNIT '4’ 20'
I A
DIQS/ENRG §G\ 122 , DATA DECODER 1 Focus
CIRCUIT , 300 123w REPRODUCING ADJUSTMENT
( I > CHARACTERISTIC -> UNIT
I 130 MEASUREMENT UNIT 202
l ,
m $1 FE SIGNAL GENERATING UNIT j—a' ADJUSTMENT
150 TE SIGNAL GENERATING UNIT UNIT
140 TE SIGNAL
C%§?R%EB%% CHARACTERISTIC ~>
T 141w MEASUREMENT UNIT
~—-——-1 SPHERICAL ABERRATION CORRECTION UNIT if
160
~—————————{ ACTUATOR CONTROL UNIT L-——-—-— CENTRAL
————-—————1 SPINDLE MOTOR CONTROL UNIT p“—\k— 1—70— ——— UNIT
\ 180 A
100 400 A HOST CONTROLLER

Patent Application Publication Dec. 4, 2014 Sheet 2 0f 18 US 2014/0355403 A1
REPRODUCED
SIGNAL I
AMPLITUDE (V) {1.8 : '
an ’ - ’ 1. ._ 2 mm
an
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69
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~33
FOCUS BALANCE ‘29 SPHERICAL ABERRATION
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~40 CORRECTION AMOUNT
(STEP)
Patent Application Publication Dec. 4, 2014 Sheet 3 0f 18 US 2014/0355403 A1
REPRODUOED
SIGNAL
» AMPLITUDE <v>
~— 1.12 '
~~ 11:»?
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BALANCE - A - 9.59
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SPHERICAL ABERRA'NON
CORRECTION AMOUNT (STEP)
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SPHERICAL ABERRATION
CORRECTION AMOUNT (STEP)
Patent Application Publication Dec. 4, 2014 Sheet 4 0f 18 US 2014/0355403 A1
6“ TE SIGNAL
A E A» ~ AMPLITUDE (v)
3.48
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BALANCE .... -. 1,3»,
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(STEP) '
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SPHERICAL ABERRATION
CORRECTION AMOUNT (STEP)
69 i g i ; REPRODUOED SIGNAL
F i ’ ‘ AMPLITUDE (1.12V)
59 ; —- -- A i-MLSE
49 US$33;‘ ‘‘‘‘ n (34_4%)
REPRODUOED U __“jj~_-__ ------- -- TE SIGNAL
36 “‘ Abiéiig/bl-DE ~ W " AMPLITUDE (1.4M
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SPHERICAL ABERRATION
CORRECTION AMOUNT (STEP)
Patent Application Publication Dec. 4, 2014 Sheet 5 0f 18 US 2014/0355403 A1
FiG.$(a)
1.2
pauq, FE BALANOE
1,1 g0- ~“ ------------ (STEP)
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SPHEFHCAL ABERRATION
OOPREOTTON AMOUNT (STEP)
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i CORRECTION
1.1 ' AMOUNT (STEP)
-O-~ ~ 34
REPRODUOED 1‘0
SIGNAL ; “'3’ ' 28
AMPLITUDE (V) E
00 18 ? “MA-n ..
~ 40 ~ 20 0 20 40 60
FOCUS BALANCE VALUE (STEP)
Patent Application Publication Dec. 4, 2014 Sheet 6 0f 18 US 2014/0355403 A1
Haw)
18.0
FE BALANCE
no g (STEP)
16‘0 iiiiiiiiiiiiii A '“ue'w' '“ 15
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SPHERICAL ABERRATION
CORRECTION AMOUNT (STEP)
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ABERRATION
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AMOUNT (STEP)
-e~ - 36
"EN ~30
FMLSE (‘36)
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~40 ~20 0 20 4O 60
FOCUS BALANCE VALUE (STEP)
Patent Application Publication Dec. 4, 2014 Sheet 7 0f 18 US 2014/0355403 A1
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Patent Application Publication Dec. 4, 2014 Sheet 8 0f 18 US 2014/0355403 A1
1.15
1,10 .LF--~ -v ;v.; ------!---
REPRODUCED ms
SIGNAL ZE PE
PE
AMPLITUDE (v) mo
0.90 1
~45 ~40 ~35 ~30 ~25 ~20 ~15
SPHERICAL ABERRATION
CORRECTION AMOUNT (STEP)
1.15
MPG-m mmmmmmmmmmm
REPRODUCED 1.05
SIGNAL 3; PE PE
AMPLITUDE (V) 100
~40 ~20 O 20 4O 60
FOCUS BALANCE VALUE (STEP)
1.15
1.10
REPRODUOED 1‘05
SIGNAL
AMPLXTUDE (v) 1.00
0.95
0.90
~45 ~40 ~35 ~30 ~25 ~20 ~15
SPHERICAL ABERRATION
CORRECTION AMOUNT (STEP)
Patent Application Publication Dec. 4, 2014 Sheet 9 0f 18 US 2014/0355403 A1
mama) HQQM)
A A L5
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FOCUS FOCUS
BALANCE BALANCE
VALUE VALUE
SPHERICAL ABERRATION R SPHERZCAL ABERRATION
CORRECTION AMOUNT CORRECTION AMOUNT
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SPHERICAL ABERRATION § SPHERICAL ABERRATION
CORRECTION AMOUNT CORRECTION AMOUNT
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BALANCE BALANCE
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SPHERICAL ABERRATION p SPHERICAL ABERRATION
CORRECTION AMOUNT CORRECTION AMOUNT