Mechanisms - Canon A-1 Repair Manual

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(7)
Others
1)
Hybred magnet
When the shutter button is released, a magnet
starts functioning the camera
.
This magnet
,
like
the one
used
1
n the AE-!
,
is a hybred magnet
employing a permanent magnet and an electromagnet
.
However, the hyhread magnet installed i
n
the A-I
employes an additional alloy, made of rare earth
element (samarium) and cobalt, in the magnetic
body section
.
2)
Temperature compensating resistor
A wire-wQurd resistor was used for the temperature
compensating resistance in the AE
-
l.
In the
A-l
,
reliability is further
increas
ed by employi
n
g
a special metal film resistor.
4.6
Mechanisms
The A-I
1s
composed of five main units (finder, shutter,
automatic
diaphrag
m, AE an
d
mi
rror
units) and 31 sub-units.
These units are attach
to
the
body
diecast without need for
adjustments
.
Basically
,
this is similar to the AE-l.
However, its
specifications
are designed to withstand harder
conditions such as the use of the five frames per second
Motor
Drive MA.
(1)
New HD Coupler
Figure 24
shows
the shape
of
the Me
Couplers
for the
AE-l and A-l.
When continuous shooting is performed with a conventional
coupler and Motor Drive MA
,
the couple
r
collides
into
the winding stopper of t
he
camera when winding 1s
completed
.
As a reaction, the couplers on the camera
side and drive side have
some
backlash
.
At this time,
the Camera
coupler
stops after being returned slightly
by the reversal stopping spring.
But the motor drive
coupler continues reversing by inertia and collides
into the wall on the
oPPos
ite side
of the camera coupler.
This moves the once
stoppe
d
camera coupler still fur
t
her
in reverse direction by 0
.
05 mm to 0.4 mm.
This
phenomenon causes the film
to
move during exposure
.
This results in a flowing-like blurred picture.
For
this reason, in the A-I, the revers side of the MD
Coupler on the camera has been positively designed so
it is no struck by the motor drives coupler during backlash
63

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