Abstract: A display system for sensing a finger of a user applied to the display system includes a display panel; a sensor for sensing the finger; a sensing light source configured to emit a first light having a first wavelength W1; and a reflective polarizer disposed between the display panel and the sensor. For a substantially normally incident light, an optical transmittance of the reflective polarizer versus wavelength for a first polarization state has a band edge such that for a first wavelength range extending from a smaller wavelength L1 to a greater wavelength L2 and including W1, where 30 nm?L2?L1?50 nm and L1 is greater than and within about 20 nm of a wavelength L3 corresponding to an optical transmittance of about 50% along the band edge, the optical transmittance has an average of greater than about 75%.

Abstract: A rotary positive displacement blower for producing a flow of fluid. The blower includes a housing having a rotor chamber, an inlet port and an outlet port. The outlet port has a first end and a second end and a first edge and a second edge which extend from the first end towards the second end while becoming increasingly spaced apart from one another. A first rotor and a second rotor are located in the rotor chamber. Each rotor includes a plurality of lobes and are each rotatable about a respective axis. Each rotor includes a plurality of pockets adapted to rotate into fluid communication with the inlet port to receive fluid and to rotate into fluid communication with the outlet port to deliver fluid as the rotors rotate.

Abstract: An apparatus that provides a hermetic seal of a valve actuator rod in a valve housing includes a piston having a center bore mounted on the actuator rod and a pair of concentric bellows, both connected to the piston at one end and connected to the actuator rod and the interior of the valve housing at their opposite ends. A sealing liquid contained in the valve housing at one side of the pair of bellows provides pressure compensation for a process pressure on the opposite sides of the bellows. The piston bore provides a tight sliding fit of the piston on the actuator rod and the piston is provided with at least one flow bypass channel permitting unrestricted flow of the sealing fluid through the piston channel. A sensitive monitoring system is mounted on the valve housing and detects slight leaks of sealing liquid through the concentric bellows or the actuator rod packing by detecting changes in the position of the piston relative to the valve housing interior.

Abstract: The invention has especial utility for providing completely safe hermetic sealing of actuators extending into highly sensitive or isolative process equipment, such as that using atomic radiation. The invention uses a general principle taught by the inventor's prior U.S. Pat. No. 3,933,052. The actuator is hermetically sealed by the aid of a flexible diaphragm, and the diaphragm is made safe by pressure compensation. A sealing liquid confined on the outside of the hermetic diaphragm applies the same pressure to the outside face of the diaphragm as is applied by the process atmosphere to the inside face of the diaphragm. According to the embodiment illustrated in that patent, a diaphragm (actually a bellows) entirely separate from the actuator was exposed to the process atmosphere to apply its pressure to the sealing liquid.

Abstract: A pressure compensated, hermetically sealed transmission system is described which includes, basically, a hermetic rotary coupling. Rotary motion is applied through a casing, wherein a cylindrically shaped input shaft having a circular inner bearing race affixed to one end is coupled to a generally spherical shaped wobble plate by means of roller or ball bearings. In similar fashion, an output shaft is similarly coupled to the spherical shaped wobble plate at the opposite end. The inner races of the shafts are positioned at an angle and located eccentrically from the respective shaft center line. Both shafts are supported at their outer ends by combination journal thrust bearings, which are coupled to the main casing. The wobble plate is prevented from rotating about the common axis of the two shafts. Thus, as one shaft rotates, the wobble plate rocks, due to ball bearing action, but does not rotate. Likewise, due to the bearing action, as the wobble plate rocks the output shaft rotates.

Abstract: A pressure compensated, hermetically sealed transmission system is described which includes, basically, a hermetic rotary coupling. Rotary motion is applied through a casing, wherein a cylindrically shaped input shaft having a circular inner bearing race affixed to one end is coupled to a generally spherical shaped wobble plate by means of roller or ball bearings. In similar fashion, an output shaft is similarly coupled to the spherical shaped wobble plate at the opposite end. The inner races of the shafts are positioned at an angle and located eccentrically from the respective shaft center line. Both shafts are supported at their outer ends by combination journal thrust bearings, which are coupled to the main casing. The wobble plate is prevented from rotating about the common axis of the two shafts. Thus, as one shaft rotates, the wobble plate rocks, due to .[.ball.]. bearing action, but does not rotate. Likewise, due to the bearing action, as the wobble plate rocks the output shaft rotates.