– 6 –
4. Lens drive block
4-1. Zoom drive
The parallel signals (ZIN1 and ZIN2) which are output from
the ASIC (IC101) are used to drive (ZOUT1 and ZOUT2) by
the motor driver IC (IC951), and then used to drive the zoom
DC motor. Detection of the standard zooming positions is car-
ried out by means of signal (ZPROUT) from the photoreflector
by ASIC is detecting inside the lens block. Also, getting of the
zooming positions is carried out by the ASIC (IC101) counting
the signal (ZPIOUT) from the photointerruptor.
4-2. Focus drive
The serial data signals (L_DATA, L_SCLK, L_STB and FCLK)
which are output from the ASIC (IC101) are used to drive
(FOUT1, FOUT2, FOUT3 and FOUT4) by the motor driver IC
(IC951), and are then used to drive the stepping motor for fo-
cusing operation. Detection of the standard focusing positions
is carried out by the ASIC (IC101) detecting the signal (FPIOUT)
from the photointerruptor inside the lens block.
4-3. Iris drive
The serial data signals (L_DATA, L_SCLK and L_STB) which
are output from the ASIC (IC101) are used to drive the shutter
constant (IOUT1 and IOUT2/SOUT1) by the motor driver IC
(IC951), and are then used to drive the iris steps.
4-4. Shutter drive
The shutter drive signals (SIN1/SIN2) which is output from the
ASIC (IC101) is used to drive the shutter constant (IOUT2/
SOUT1 and SOUT2) by the motor driver IC (IC951), and then
mecha shutter is opened and closed.
