Advertisement
5
When the conditions described above are set and focus-
close is performed, XSI terminal becomes "H" -> "L" and
after 40ms, the microcomputer starts to monitor RFOK
signal through LPF.
When RFOK signal is detected as "L", the microcomputer
takes a various action such as protection.
Fig 11 shows a series of action concerning focus-close
(this figure shows a case when focus-close is impossible).
If pressing focus-close button in condition that a select of
focus mode is "display 01" in the test mode, it is possible
to check S curve, search voltage and actual lens
operation.
5
6
FD
Relative lens position
toward a disc
NEAR
FAR
MD
RFI
FOK
FE
FZD
(internal signal)
Usually, focus-close occurs at these points.
XSI
(focus is
closed)
CX-3168
6
7
Zoom-in of "focusing point"
Fig.6 Focus-close sequence
7
8
A
REFO
Level of
"focusing time"
B
REFO
REFO
C
FZD
threshold
level
D
E
F
7
8
Advertisement
