Methods and systems for control of film transport
AssigneeIMAX Corporation
InventorsIgal Roytblat, Robert F. Frith, Alexander Mezhibovsky
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Abstract
Methods and systems of controlling transport of film are disclosed. In one embodiment, a method of controlling a supply platter motor in a no-rewind film transport system, comprises receiving take-up platter control signal information from a take-up platter controller, processing the take-up platter control signal information, and controlling the supply platter motor based at least in part on the processed take-up platter control signal information.
Claims21
A method of controlling a supply platter motor in a no-rewind film transport system, comprising:
- receiving take-up platter control signal information from a take-up platter controller;
- processing the take-up platter control signal information based at least in part on a transfer function to produce processed take-up platter control signal information, wherein the transfer function is a ratio of angular speed of a take-up platter and reguired angular speed of a supply platter;
- and
- controlling the supply platter motor based at least in part on the processed take-up platter control signal information.
A method of improving supply platter motion in a no-rewind film transport system, comprising:
- determining a time taken for a lead-in film position on a supply platter to transition predefined limits of supply platter acceleration or deceleration based at least in part on supply platter film lead-in position feedback;
- determining a speed error between a supply platter reference speed signal and a supply platter speed control signal at the time of the transition;
- determining a corrected supply platter speed control signal based at least in part on the speed error signal and the supply platter reference speed signal;
- and
- controlling the supply platter based at least in part on the corrected supply platter speed control signal.
A no-rewind film transport system, comprising:
- a take-up platter controlled by a take-up platter motor;
- a take-up platter controller capable of controlling the take-up platter motor through take-up platter control signals;
- a processor capable of receiving and processing the take-up platter control signals based at least in part on a transfer function to produce processed take-up platter control signal information;
- a supply platter controlled by a supply platter motor;
- a supply platter controller capable of receiving the processed take-up platter control signal information and controlling the supply platter motor at least in part with the processed take-up platter control signals information,
- wherein the transfer function is a ratio of angular speed of the take-up platter and required angular speed of the supply platter.
A method of upgrading performance of a no-rewind film transport system, comprising:
- adapting the system so that take-up platter control signal information is processed based at least in part on a transfer function to produce processed take-up platter control signal information, wherein the transfer function is a ratio of angular speed of a take-up platter and required angular speed of a supply platter;
- and
- a supply platter motor is controlled at least in part based on the processed take-up platter control signal information.
Dependencies are inferred from the claim text.