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When through using camera it be can folded and
latched in its closed conguration by pushing
the erecting link. When the camera is closed,
the interlock switch (S6) is opened so that the
battery is completely disconnect from the camera
circuits. The trim wheel (the lighten / darken
adjustement associated with the photocell)
automatically returns to its normal position each
time the camera is closed.
The shutter employed in the SX-70 camera is
unique. No direct comparisons should be drawn
between the manner in which it functions and the
function of other Polaroid electronic shutters. No
manually adjustable or xed aperture is employed.
When a picture is taken, two shutter blades, with
specially shaped cutouts, open the lens from a
totally closed position to a suitable aperture. The
two blades then reverse direction and again shut
off the optical path. These same two blades also
contain a similar (although differently shaped)
pair of cutouts that open and close the light path
to the photocell in like manner. In the following
description the functions of photocell cutouts is
deferred until the action of the shutter cutouts is
explained although in operation, the two functions
are interdependent.
When the camera is open for viewing, but before
the release button is pressed, solenoid #1 is
deenergized and the shutter blades are open. A
spring (openong spring) holds the shutter blades
wide open (Figure 1-10). The lens thus provides
maximum viewing / focusing brilliance. Solenoid
/ spring action is discussed in detail in the next
section of this manual.
Figure 1-9 Inserting the ash bar
10. Closing the camera
C. SHUTTER DESCRIPTION
(AMBIENT LIGHT MODE)
Figure 1-10 Shutter blades held opened