|The PSD-2 Pattern reader is used on printers, developing machines
and the TFS ILD . The reader reads a pattern
(shown below) on 35mm film. The reader accommodates ultrasonic
splices, tape splices and staple splices.
On printers it is used for synchronizing light change
information with the negative
and also synchronizing the picture and sound track negatives to each
other. On developers it is used for precise automatic stopping on the take-up station.
Paired with the ILD, the PSD is used for triggering the reading of LAD
The unit is sold with a decoder
box. The signal from the decoder box is a TTL level 10 millisecond
pulse. There is also an led on the decoder box that switches on and
off due to the pattern passing though the PSD. Power requirement is
15 VDC to the decoder box.
Calibration of the unit
is done once at the factory. Maintenance consists of cleaning the
area above and below the film path with an alcohol swab.