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2-16
is giver in Fig.2-2,
details of the system are
shown in Chapter
5, as an
exploded view.
2-4
MIRROR
FLIP
UP
To enable the mirror
sheet to move
backward
while flipping up,
four arms
are employed
for sustaining the mirror
sheet.
Mirror
flip
up force from
the shutter
system
is transmitted to the sheet by the rota-
ting arm.
The operation
is shown below in Fig. 2-22.
A shock damper
is
employed
to minimize
the mirror
shock when
the
mirror
returns
to the original position.
This damper
is also utilized as
mirror
angle setter.
MIRROR
SHEET ARM
MIRROR
MIRROR
SHEET
ACTUATOR ARM
SHOCK DAMPER
PLATE
Pig.2-22
2-5
FP,
X SYNCHRONIZATION
FP
synchro,
contact locates in the shutter
system
as shown in Fig.
2-15.
The
lst curtain
intermediate
lever turns ''on'' the contact when
it
activates the lst curtain checker
lever.
X synchro.
contact locates
in the curtain bounce
prevention
system,
The
lst curtain damper
disk turns
''on'' the X contact when the lst curtain
finishes its traveling.
2-6
ELECTRONICAL
CIRCUIT
A
General
A6V
silver battery powered
circuit mainly
consists
of a circuit board,
an electromagnet
and a rotary switch.
Transistors,
resistors and capa+
citors locate on the circuit board.
The circuit is composed
of two sec-
tions,
regarding
the operation;
shutter
speed governor
circuit and
BATT
checker
circuit.
B
Governor
circuit
Principle of Electronic
shutter
To measure
''time"' for an exposure,
a capacitor,
resistor
and power
source
are used.
The
capacitor
connected
to the source
through the re-
sistor,
as shown
in Fig.2-23,
accumulates
a current from the source.
The terminal
voltage of the capacitor
rises up to the same
voltage as the
source
has when it is saturated.
Certain 'time'' is necessary
for the
saturation,
and is variable
in proportion to the resistance
value of the
resistor,
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