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4. Lens drive block
4-1. Shutter drive
The serial data signals (LENS_ENB, LENS_MD1, LENS_MD2,
LENS_MD3, LENS_IN1 and LENS_IN2) which is output from
the ASIC (IC101) are used to drive (Shutter_3 and Shutter_4)
the shutter constant driver (IC951), and then shutter is opened
and closed by moving magnet motor.
4-2. Iris drive
The serial data signals (LENS_ENB, LENS_MD1, LENS_MD2,
LENS_MD3, LENS_IN1 and LENS_IN2) which are output from
the ASIC (IC101) are used to drive (Aperture_1 and Aper-
ture_2) the motor driver (IC951), and are then used to drive
the iris steps by meter-motor.
4-3. Focus drive
The serial data signals (LENS_ENB, LENS_MD1, LENS_MD2,
LENS_MD3, LENS_IN1 and LENS_IN2) which are output from
the ASIC (IC101) are used to drive (Shutter_3 and Shutter_4)
the motor driver (IC951), and are then used to drive the step-
ping motor for focusing operation.
Detection of the standard focusing positions is carried out by
the ASIC detecting the signal (FPIAD) from the photointerruptor
(LD_PI) inside the lens block.
4-4. Zoom drive
The zoom DC motor drive signals (ZIN1 and ZIN2) 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
the ASIC detecting the signal (ZPROUT) from the photoreflector
(ZOOM_PR) inside the lens block.
Also, getting of the zoom positions is carried out by the ASIC
(IC101) counting the signal (ZPIOUT) from the photointerrupter
(ZOOM_PI) inside the lens block.
