Abstract: A light sensitive, heat developable film is stored in a cassette which includes a sliding film carrier bracket for transporting the film into and out of the cassette housing. Each cassette housing encloses a supply spool, a take-up spool, the light sensitive film, the film carrier bracket mechanism and a drive means for propelling the film carrier bracket in and out of the cassette housing. A door is slidably attached to the front of the housing to shield the film from ambient light when the cassette is not in use. When the cassette is placed into a recording machine the supply and take-up spools are engaged by motors capable of driving the spools forward or backward. At the beginning of operation an internal drive motor propels the film carrier bracket into contact with the inside of the door which releases an internal door lock. An external lead screw then withdraws the door upwardly.

Abstract: A digital pressure sensor system is disclosed wherein a pressure differential causes the resistance of two equal, diffused piezoresistors to change by equal but opposite amounts. Temperature compensation is achieved by using the temperature dependency of the piezoresistors in combination with a temperature reference resistor to establish a plurality of time durations of a distinct voltage level. The ratio of these time durations forms a temperature compensation factor which may be used to compensate the pressure reading.

Abstract: A digital piezoresistive pressure transducer is provided wherein a pressure differential causes the resistance of two equal, diffused piezoresistances to change by equal but opposite amounts. The variable resistance of the two piezoresistance elements is utilized to correspondingly vary the time duration of two distinct voltage levels. The ratio of the time duration of the two voltage levels bears a linear relationship to the differential pressure across the transducer that enables the various values of pressure to be determined.

Abstract: A real time, adaptive control system for a stepper motor is achieved by measuring specific real time characteristics and calculating therefrom the number of steps that will be required to decelerate the stepper motor to a complete stop at a desired position, all within a single displacement or move.