– 5 –
4. Lens drive block
4-1. Focus drive
The 16-bit serial data signals (LENS_SDI) and (LENS_SCLK
and LENS_EN) which are output from the ASIC (IC101) are
used to drive (FOCUS A +, FOCUS A -, FOCUS B + and FO-
CUS B -) by the motor driver IC (IC951), and are then used to
microstep-drive the stepping motor for focusing operation.
Detection of the standard focusing positions is carried out by
the ASIC (IC101) detecting the signal (FOCUS_PI_E) from
the photointerruptor inside the lens block.
4-2. Zoom drive
The 16-bit serial data signals (LENS_SDI) and (LENS_SCLK
and LENS_EN) which are output from the ASIC (IC101) are
used to drive (ZOOM A +, ZOOM A -, ZOOM B + and ZOOM B
-) by the motor driver IC (IC951), and are then used to
microstep-drive the stepping motor for zooming operation.
Detection of the standard zooming positions is carried out by
means of signal (ZOOM_PI_E) from the photointerruptor by
ASIC (IC101) is detecting inside the lens block.
4-3. ND filter
The 16-bit serial data signals (LENS_SDI) and (LENS_SCLK
and LENS_EN) which are output from the ASIC (IC101) are
used to drive (ND + and ND –) by the motor driver IC (IC951),
and then the ND filter is inserted into and removed from the
beam path.
4-4. Iris drive
The drive method is a galvanometer type without braking coil.
The output from the Hall sensor inside the lens is amplified by
the Hall amplifier circuit inside the IC971 lens drive IC, and the
difference between the current and target aperture determined
by the resulting output and the exposure amout output from
the ASIC (IC101) is input to the servo amplifier circuit (IC971)
to keep the aperture automatically controlled to the target ap-
erture. The lens aperture control signal is output from IC971
and is input to lens drive IN5A of IC951. IC951 functions as
the driver for driving the lens.
4-5. Shutter drive
Reverse voltage is applied to the above aperture drive coil to
operate the shutter. When the shutter operates, the OC_EN
and OC_CONT signals are maintained at a high level, it is
input to IN5A of IC951 with low level.
At the same time the S signal that is output from
the ASIC (IC101) becomes high (input to IN5B of IC951) and
the shutter operates. IC951 functions as the driver for driving
the lens.
Summary of Contents for VPC-CS1 - Full HD 1080 Video
Page 9: ... 9 MEMO ...
Page 15: ... 15 2 5 BOARD LOCATION VF1 board TB2 board TB1 board CP1 board CP2 board TB3 board ...
Page 25: ... 25 MEMO ...
Page 27: ...2 7 Table of accessories 2 2 3 3 4 5 5 1 1 6 8 9 7 ...
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