3 - 2
Description of Operation > Description of Structure / Description of Newly Adapted
Fig. 3-1-1 Confi guration of circuit boards and their mounting locations
(a)
(b)
(c)
(d)
(h)
(e)
( f )
(g)
( j )
( i )
(a) Disc drive unit
(b) Lens unit
(c) EVF unit
(d) LCD unit
(e) AVJ-H/M/L
circuit
board
( f ) FRT-H/M/L
circuit
board
(g) GSL-3M/2M/1M/L
circuit
board
(h) LMF-H/M/L
circuit
board
( i ) MAN circuit board
( j ) SHE-H circuit board
3-2 Description of Newly Adapted Technology
3-2-1 Features and Format of +RW
A +RW is a disc that can be written approx. 1000 times. The “DVD+RW Alliance” establishes its
specifi cations: These specifi cations are similar to those of DVD-RW, but the wobble and address
data recording format are different.
“Wobble” refers to the frequency of groove which is provided to guide a pickup. The +RW address
data is recorded and superimposed on this groove; the DVD-RW address data is recorded in an area
that is called a “land” between the grooves.
Table 3-2-1 Comparison of Specifi cations bRW and DVD-RW
ł
: Same as on left column
Item
+RW (single layer)
DVD-RW
Disc diameter
12cm
8cm
12cm
8cm
Storage capacity
4.7GB/ side
1.46GB/ side
4.7GB/ side
1.46GB/ side
Thickness of disc
1.2mm
ł
Rewritable number of times
At least 1000
ł
Refl ectance ratio
18 - 30%
ł
Track width
0.74
Ǎ
m
ł
Recording/playback
laser wavelength
650nm
ł
Wobble
817kHz
140kHz
Address data recording format
LPP (Land Pre-Pit)
ADIP (Address In Pre-groove)
