USO0RE40133E
(19) United States (12) Reissued Patent
(10) Patent Number:
Miyagawa et a].
(45) Date of Reissued Patent:
(54)
OPTICAL RECORDING/REPRODUCING APPARATUS FOR OPTICAL DISKS WITH VARIOUS DISK SUBSTRATE THICKNESSES
4,450,553 4,841,502 4,937,808 5,091,815
(75)
Inventors: Naoyasu MiyagaWa, Suita (JP); Yasuhiro Gotoh Kadoma (JP)
5 991901 A 5,097,464 A
’ .
US RE40,133 E
A A A A
5/1984 Holster et al. 6/1989 Mlfmkami 6t a1~ 6/1990 shlmaFla er a1~ 2/1992 Suzuki
2/1992 Y*.1m*.‘m°F° et 31' 3/1992 Nishiuchi et al.
5,173,816 A
.
.
.
5,208,801
(73) Ass1gnee: Matsushlta Electric Industr1alco., Ltd., Osaka (JP)
Mar. 4, 2008
12/1992 Oslhara
A
5/1993
5,255,262 A
Fine an
10/1993 Bestget a1‘
FOREIGN PATENT DOCUMENTS -
(22)
_
Flled.
.
Dec. 13, 1999 Related US. Patent Documents
EP
144436 Al
EP
0252445 Al
6/1985
V1988
EP EP
0327033 A2 452953 A2
8/1989 “M991
Relssue of:
(64)
Patent No.:
5,235,581
Issued:
Aug. 10, 1993
OTHER PUBLICATIONS
APPI' NO‘:
07/740 629
Japanese Patent Abstract, “Opt1ca1 D1sc Regenerator”, V01.
AugI 5,’
JP4A4524153705. 2, Braat, et a1., “Principle of Optical Disc Systems,” 3rd Edi
_
U_S_ Applications; (63)
Continuation of application No. 08/396,981, ?led on Mar. 1, 1995, HOW Pat N0~ Re~ 36,445
(30)
pp' 1069*1070’ 1149'
Aug. 9, 1990
(JP) ......................................... .. 02-21253?
Oct, 22, 1990
(JP)
Mar. 11, 1991
(JP) ......................................... .. 03-044798
(52)
lion, 1987, PP- 170*172 Van Nostrand’s Scienti?c Encyclopedia, 3rd Edition, 1958,
Foreign Application Priority Data
Primary ExamineriNabil Hindl
02-285006
(51) Int. Cl. G11B 7/00
(74) Attorney, Agent, or FirmiStevens, Davis, Miller & Mosher, LLP
(57) (2006.01)
U 5 Cl ' l l .
i,
’
ABSTRACT
[An optical disc apparatus for recording, reproducing or
369/44 12, 369/112 24_ 22, 569294, 36965 2’
.
_
i
’
’
erasing an information signal by converging a light ?ux onto a recording layer through a transparent substrate. The appa
'
ratus includes one or a plurality of optical heads having a
(58) Fleld of cggjrlcilgolnogeilf 163/225; 369/94, 93, 58, 120’ 4437’ 5322’ 531, 532,
plurality of objective lenses Whose aberrations have respec t1ve1y been' corrected for a p1ura11ty of disc substrates of
See application ?le for Complete Search history
disc, a discrimination hole Which is formed on the cartridge,
3 69/ 4 4 2 4 112 2 4
dliferent thlcknesses, a cartrldge for enclosing the optical
'
and a sensor for detecting the open1ng/c1os1ng state of the
References Cited
discrimination hole and for generating a discrimination signal. In accordance With the result of the discrimination as
U.S. PATENT DOCUMENTS
to the thickness of the loaded optical disc, the objective lens,
(56)
4,037,929 A
in Which the occurrence of the aberration is smallest, is used,
7/ 1977 Bricot et al.
so that the information signal can preferably be recorded,
I _ s9
40 36 ACTUATOR
CURRENTS
DRNING
I46
"'_"_—‘"
FROM
[_ '7“
TRACKING CONTROL
l
'
'
N44 I i
5TH SELECTOR 2|
1
e”
33 {I 37
Pi-OTO DETECTION SIGNAL TO IST SELECTOR K)
3
5 45 3s - 47
|_!
'
34
C(NTROL DRIVING GJRRENT CIRCUIT FROM___.ql l3 '
3km i
'
/
32
.
'
'
.'
cmcun H AND FOCUSING
'
I
,t
42 l
. n
I
[SELECTOR 2|
11 43 48
1..
4| | P-so
-_--_PHO‘IO DETECTION SIGNAL TO IST SELECTOR
l0
US RE40,133 E Page 2
reproduced or erased onto/from the optical discs having
ing distances, such as objective lenses or grating lenses, for
different substrate thicknesses. Instead of an optical head
performing aberration correction over a plurality of trans
having objective lenses, an optical head having a Waveguide and a plurality of converging grating couplers Whose aber
parent substrates of dijferent thicknesses of optical discs and
rations have respectively been corrected for a plurality of disc substrates of different thicknesses is provided to achieve
the same object] An optical recording/reproducing appara tus for recording, reproducing or erasing an information signal onto/from an optical disc having at least a transpar ent substrate and an information layer by converging a light ?ux on the information layer through the transparent sub strate. The apparatus includes optical converging devices, with dijferent numerical apertures, focal distances or work
a device for discriminating the type of optical disc based on the thicknesses of the transparent substrates. One of the optical converging devices that generates the least aberra tion is used according to a result ofthe discrimination ofthe thickness ofthe optical disk loaded in the apparatus to cause
the information signal to be suitably recorded, reproduced or erased onto/from the optical discs having the dijferent substrate thicknesses.
21 Claims, 18 Drawing Sheets
U.S. Patent
Mar. 4, 2008
Sheet 2 0f 18
US RE40,133 E
FIG. 2 i'___''"'_''''''""''—"'_____14/ /'7 I I
I l I l
U.S. Patent
Mar. 4, 2008
Sheet 3 0f 18
FIG .3A
FIG .38
US RE40,133 E
U.S. Patent
Mar. 4, 2008
Sheet 4 0f 18
US RE40,133 E
FIG. 4A RECORDING LAYER
1
DISC SUBSTRATE
LOW NA LENS
FIG.4B RECORDING LAYER (124:; ‘" ---- “i——————— -=-
DISC SLBSTRATE
HIGH NA LENS
U.S. Patent
Mar. 4, 2008
Sheet 5 0f 18
US RE40,133 E
_N
AvMA.llrl. L.,
N
.m m _
1W N \ NmF
=._ _
5.%3@6525:oTz4?2'mIwu’o8.586
t/mm
7m1 5 NF ~.._ 0.
.0GE
52%?lmE.J gum.c‘I.S_UZDON= \
I
U.S. Patent
Mar. 4, 2008
Sheet 8 0f 18
0.EP2ZUO1DE0 004ONE5D2UmE Om].
m0EhO2zP<5wDt-sQoJ0EO2K6P5mZ:EU,w.QZZCmDUu
US RE40,133 E
U.S. Patent
Mar. 4, 2008
Sheet 9 0f 18
US RE40,133 E
.26r0zw-m2gu5 .QONCZDSU.EQ
QBE2.385Jc
_
0 <0. n_ _
n8 km @Q
T, mm‘ . _ _ mm
a,ma~ vm
8mm.T/ .5
L.l_: @.2E 965.82 :@o:23z58B <2 P4205826 mFJ2r°alCwn.!- H U
[email protected]
2mw8d_o9E\wzB
J. Ml.
U.S. Patent
Mar. 4, 2008
Sheet 11 0f 18
0k2z-m10a
US RE40,133 E
@.E_3ZO2wmE5SU Emm_Neow-m
P2.m0-OhMwJ‘m
U.S. Patent
Mar. 4, 2008
Sheet 12 0f 18
8!6.593m
2n9485 B6
US RE40,133 E
0h2z.m10s"o- Im_Nebmnom mi
|ZE_
l'
U.S. Patent
Mar. 4, 2008
Sheet 13 0f 18
zJodtbmgkwo
US RE40,133 E
_2Eum0Eao _0#3825.826% _
>IwOmZQvD?nwgE
23#00.C4DmU:wE0O
U.S. Patent
Mar. 4, 2008
US RE40,133 E
Sheet 16 0f 18
FIG. l6
WT OF CONVERGED SPOT
In‘;
EMI'ITED LIGHT
III Y
I |
I
\
I I
I
\
I
\
i \
I! I \\ \/ I I \I \\\ .l l OPTICAL
,' .‘
\.
WAVEGUIDE II I, ,
'
WAVEGUIDE LIGHT k‘ \v
I
‘\\ \ \\ \
I
I
,
I
§
‘
_
__
/
' __
&\ SAW TRANSDUCER
6/ _ .__
a é SURFACE wousnc
\ __ _.
—
-—
ING GRATING COLPLER
_a
, /
WAVE
U.S. Patent
Mar. 4, 2008
Sheet 17 0f 18
US RE40,133 E
FIG. I?
ZMmOCJbDw0Zm
<3
ti_l rsuL‘Il-O'u
'‘lIr.
l'‘iI" 2
TRACKING HQROR SIGNAL
U.S. Patent
Mar. 4, 2008
Sheet 18 0f 18
US RE40,133 E
FIG. IBA PRIOR ART
0
(RECORDING LAYER
LENS
FIG. IBB PRIOR ART
I. RECORDING LAYER l
.
N USC SUBSTRATE
LENS
