Polaroid Joshua Vision Service Manual page 133

Track & Hold System
Trap End
Two-Zone Focus System
VER, Ver
VF
Viewfinder Blind
Viewfinder Mirror
Visible Integrator
Walking Beam
Wake-Up Mode
Wink
Wink Aperture
Priority System
Wireform Switch
Wrap-Spring Clutch
Exposure determination and control system developed for Joshua Camera,
using high IC switching speeds and implemented in chip design. Ambient
and strobe contributions are determined in advance, strobe is fired at smallest
practical aperture, ambient integration continued until exposure is complete.
Film frame end opposite to pod end.
In Joshua, consists of 0.6 to 2.4 m and 2.4 m to infinity. Near zone uses
Main Lens system only, far zone adds Far Focus Lens.
Erect Voltage line; when closed to B+, camera is powered.
Abbreviation for viewfinder.
Pivoted mask which covers Viewfinder window during exposure, preventing
entrance of stray light.
Concave mirror which redirects image from Fixed Mirror to Eyelens.
Electronic summing circuit for visible (ambient) light measurements by
Photometer.
Pivoted arm in Shutter System which couples Solenoid 1 to Blades, closing
them when Solenoid is energized. (Blades are normally open, under spring
load).
Camera cycle initiation at full operating voltage, triggered by . . . (reset
signal? from microprocessor?).
Pre-exposure discharge of about 10% of strobe energy and measurement of
reflected IR.
Prediction of smallest possible practical aperture for strobe fire (and thus
maximum depth of field), based on Wink strobe fire and measurement.
Primary purpose of Wink is aperture prediction; also determines if Far Focus
Lens is needed.
Design used for Power and Logic Switches; flexible wires mounted in
molded switchblock contact a common ground plane when deflected by
manually or drive-pivoted arms.
See Clutch, Wrap Spring.
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