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Reflective LCD projection system using wide-angle Cartesian polarizing beam splitter and color separation and recombination prisms

An optical imaging system including an illumination system, a Cartesian PBS, and a prism assembly. The illumination system provides a beam of light, the illumination system having an f / # less than or equal to 2.5. The Cartesian polarizing beam-splitter has a first tilt axis, oriented to receive the beam of light. A first polarized beam of light having one polarization direction is folded by the Cartesian polarizing beam splitter and a second polarized beam of light having a second polarization direction is transmitted by the Cartesian polarizing beam splitter. The Cartesian polarizing beam splitter nominally polarizes the beam of light with respect to the Cartesian beam-splitter to yield the first polarized beam in the first polarization direction. The color separation and recombination prism is optically aligned to receive the first polarized beam. The prism has a second tilt axis, a plurality of color separating surfaces, and a plurality of exit surfaces. The second tilt axis maybe oriented perpendicularly to the first tilt axis of the Cartesian polarizing beam-splitter so that the polarized beam is nominally polarization rotated into the second polarization direction with respect to the color separating surfaces and a respective beam of colored light exits through each of the exit surfaces. Each imager is placed at one of the exit surface of the color separating and recombining prism to receive one of the respective beams of colored light, wherein each imager can separately modulate the polarization state of the beam of colored light.
Owner:3M INNOVATIVE PROPERTIES CO

Method and system for user created personal private network (PPN) with secure communications and data transfer

InactiveUS20050132183A1Easily and effectively leverageWithout complexitySecuring communicationDigital dataSecure communication
Methods and systems are provided for any individual with access to a network to create, operate and thereafter dismantle a personal private network (PPN) which is secure across all forms of media which facilitate digital data transfer, including but not limited to, both wireless and wireline based networks. In one embodiment, utilizing browser-based management objects and a PPN client server the present invention provides for any individual with access to the Internet or other types of networks to create, control and utilize his own PPN with any one or a plurality of authorized participants. This invention facilities this capability with the creation of secure pipelines between each authorized participant of the PPN, where, if necessary, to establish these secure pipelines, a tunnel under, around or through border servers and/or firewalls is created. Each PPN provides the authorized participants with complete freedom to communicate, to review information and to transfer data between participants with full and complete encryption security. The creation, operation and the dismantlement of a PPN is totally within the capabilities and control of the originating party, the source client, and requires no actions from any network or system administrators. Additionally, all of the PPN secure pipeline creation and infrastructure mapping for the enablement of the PPN, plus access controls and codes for authorizing participation and initiating participation and disconnection can be encased in a PPN secure access key.
Owner:GEARHART GLENN

On demand/emergency telematics & communication system

InactiveUS20070135088A1Without costReduction of accidental/non-emergency call rates/volumeEmergency connection handlingConnection managementBiological activationTelematics
The present invention provides On Demand / Emergency Telematics / Location-Based Services and or Wireless Communication utilizing a cellular device which is service-initialized with non-expiring but deplete-able prepaid airtime / credit, allowing transmission of calls, alarms, events, and or Telematics signals to a Private / Third-Party Remote Monitoring / Call Center (PRMC) in Emergencies or other times of need without recurring / ongoing fees for cellular lines / numbers. The system can also be activated any time after entry into service via Over The Air Activation, through service-initialization of post or pre-paid service / airtime or by porting an existing number to the system. All calls / alarms / events / transmissions requiring the PRMC to notify / contact any Public Safety / Law Enforcement Agency on behalf of the user are free of airtime and service charges. A fee is charged for all other calls / alarms / events and or services rendered by the PRMC, drawn on the prepaid airtime / credits or post billed. The system also reduces Public Safety Answering Points' / 911 Emergency Response Centers' accidental / non-Emergency call / alarm rates and overall volume by allowing the management and validation of calls / alarms / events through the PRMC before reaching a PSAP / 911 ERC. The system also enhances PSAP / 911 ERC capabilities by providing advanced Telematics, including location and ID information, as well as providing multiple language capability by routing calls to language-specific centers or operators able to assist the user and or PSAP / 911 ERC. The system also provides user privacy by On Demand activation rather than continuous “On” state activation, limiting the possibility of covert monitoring / wireless network intrusions and or retrieval / use of Telematics data not explicitly authorized by the user.
Owner:ALESSANDRO SALVATORE

Merged ramp/oscillator for precise ramp control in one cycle pfc converter

A one cycle power factor correction converter circuit comprising a switch for controlling a DC output voltage of the converter circuit, the switch being switched by a drive signal having a frequency determined by a clock signal; the converter circuit being provided with a DC input voltage and producing the DC output voltage, the DC input voltage being rectified from an AC input; a controller circuit for controlling an on-time or off-time of the switch to set the output voltage and to achieve power factor correction at the AC input; the controller circuit comprising an error amplifier receiving a feedback voltage from the output of the converter circuit and a reference voltage and producing an error signal; a ramp generator receiving the error signal and generating a first ramp signal by integrating a signal related to the error signal; a pulse width modulation circuit receiving the first ramp signal and a signal related to the error signal and producing a pulse width modulated signal by comparing the first ramp signal and the signal related to the error signal; the pulse width modulated signal determining the on-time or off-time of the switch to control the output voltage with power factor correction; further comprising a circuit for terminating the first ramp signal when a predetermined inequality exists between the first ramp signal and a reference signal and for developing the clock signal from the first ramp signal.
Owner:INFINEON TECH AMERICAS CORP
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