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4. Lens drive block
4-1. Shutter drive
The shutter drive signals (SIN1 and SIN2) which is output from
the ASIC (IC101) is used to drive the shutter constant (Shut-
ter_3 and Shutter_4) by the motor driver (IC951), and then
mecha shutter is opened and closed by moving magnet motor.
4-2. Iris drive
The iris drive signals (IIN1 and IIN2) which are output from the
ASIC (IC101) are used to drive the shutter constant (Aper-
ture_1 and Aperture_2) by the motor driver (IC951), and are
then used to drive the iris steps by meter-motor.
4-3. Focus drive
The serial data signals (L_ST, L_DATA, L_SCLK, L_STB and
FCLK) which are output from the ASIC (IC101) are used to
drive (LD_Motor_A (+), LD_Motor_ A (–), LD_Motor_B (+) and
LD_Motor_B (–)) by the motor driver (IC951), and are then
used to drive the stepping motor for focusing operation. Detec-
tion of the standard focusing positions is carried out by means
of signal (FPIOUT) from the photointerruptor (LD_PI) by ASIC
is detecting inside the lens block.
4-4. Zoom drive
The serial data signals (L_ST, L_DATA, L_SCLK, L_STB and
ZPWM) which are output from ASIC (IC101) are used to drive
(Zoom and Zoom_Motor –) by the motor driver
(IC951), and are then used to drive the zoom DC motor.
Detection of the standard zooming positions is carried out by
means of signal (ZPROUT) from the photoreflector
(ZOOM_PR) by ASIC is detecting inside the lens block.
Also, getting of the zoom positions is carried out by means of
signal (ZPIOUT) from the photointerrupter (ZOOM_PI) by ASIC
(IC101) is counting inside the lens block.
