Georgia Epps

US Patent 7087882 Controlling the dynamic range of an avalanche photodiode

US Patent 7087884 Light barrier or light grid with alignment mechanism

US Patent 7091474 Rotation angle detecting device

US Patent 7095002 Adaptive lighting control for vision-based occupant sensing

US Patent 7095004 Image sensing module capable of fast transferring signal and method thereof

US Patent 7095006 Photodetector with hetero-structure using lateral growth

US Patent 7098438 Method and apparatus for resetting a high speed latch circuit

US Patent 7098440 Method and apparatus for inspecting hot hollow articles that are translucent or transparent

US Patent 7098446 Photoelectric encoder

US Patent 7098447 Light source for the illumination of microscopic specimens and scanning microscope system

US Patent 7102117 Active pixel sensor cell with integrating varactor and method for using such cell

US Patent 7102119 Ball bounce game using electromagnetic beams

US Patent 7102120 Optical module with built-in wavelength locker

US Patent 7102122 Methods and means for using a photosensor as an encoder and a trigger

US Patent 7105795 Imaging system, methodology, and applications employing reciprocal space optical design

US Patent 7105797 Optical receiving circuit

US Patent 7105847 Semiconductor processing-purpose substrate detecting method and device, and substrate transfer system

US Patent 7105849 Hydrocarbon fluid analysis module

US Patent 7106523 Optical lens used to focus led light

US Patent 7109459 Auto-focusing method and device for use with optical microscopy

US Patent 7109462 Light beam output control apparatus, optical pickup apparatus, light beam emission control method and computer-readable recorded medium in which light beam emission control program is recorded

US Patent 7109464 Semiconductor imaging system and related methodology

US Patent 7109466 Peak and bottom detectors in burst mode optical receiver

US Patent 7109472 Scale for reflective photoelectric encoder and reflective photoelectric encoder

US Patent 7109510 Method and apparatus for aligning a substrate on a stage

US Patent 7109512 Optical transducer for detecting liquid level and electrical circuit therefor

US Patent 7112780 Detector unit

US Patent 7112781 Absolute encoder

US Patent 7113319 Photonic crystal and optical waveguide elements

US Patent 7115850 Sensor device with three-dimensional switch carrier having differently oriented infrared photodetectors

US Patent 7115853 Micro-lens configuration for small lens focusing in digital imaging devices

US Patent 7119315 Control system for microscopes

US Patent 7119963 Lenticular screen with removable alignment tab

US Patent 7122777 Image capture device, including methods for arranging the optical components thereof

US Patent 7122783 Seismic activity monitor based on optical fiber Bragg gratings

US Patent 7122818 Optical displacement sensor using optical fiber, and external force detecting device

US Patent 7122819 Method and apparatus for imager die package quality testing

US Patent 7126099 Image sensor with improved uniformity of effective incident light

US Patent 7126101 Image pickup device

US Patent 7126102 Photoelectric conversion device and camera using photoelectric conversion device

US Patent 7126106 Quantum computer and quantum computation method

US Patent 7129456 Method and apparatus for calculating image correction data and projection system

US Patent 7129463 Photocurrent sensing circuit having stabilized feedback loop

US Patent 7129475 Photoelectric encoder and method of manufacturing scales

US Patent 7129510 Optical sensors

US Patent 7132638 CCD imaging array with improved charge sensing circuit

US Patent 7135664 Method of adjusting multiple light sources to compensate for variation in light output that occurs with time

US Patent 7138618 Solid-state image pickup device and image pickup camera

US Patent 7138621 Optical fiber sensors based on pressure-induced temporal periodic variations in refractive index

US Patent 7138622 Method and apparatus for monitoring light beams

US Patent 7138645 Calibration pattern unit photographed by an imaging system to acquire an image for obtaining correction information

US Patent 7141775 Solid-state image-pickup device with column-line amplifiers and limiters

US Patent 7141815 Fiber optic-based probe for use in saltwater and similarly conductive media as found in unenclosed natural environments

US Patent 7145126 Optical position encoder device using incoherent light source

US Patent 7145127 Optical encoding that utilizes total internal reflection

US Patent 7145130 Rotation detecting device and automobile with the same

US Patent 7145162 Wire loop height measurement apparatus and method

US Patent 7145164 Media routing control based on a characteristic of the media

US Patent 7151246 Imaging system and methodology

US Patent 7154077 Device and method for measurement of incident power and energy

US Patent 7154078 Differential column readout scheme for CMOS APS pixels

US Patent 7154082 Frequency division and/or wavelength division multiplexed recursive fiber optic telemetry scheme for an optical sensor array

US Patent 7157726 Method and apparatus for measuring shape of sheet

US Patent 7161127 Automatic focusing apparatus and automatic focusing method using an index value based on background color information

US Patent 7161129 Image capture device, including methods for arranging the optical components thereof

US Patent 7161132 Lens system and image-taking apparatus having the same

US Patent 7164115 Photoelectric conversion apparatus, manufacturing method therefor, and X-ray imaging apparatus

US Patent 7164118 Method and system for obstacle detection

US Patent 7166825 Solar calibration device and method

US Patent 7166830 Light detecting sensor

US Patent 7166833 Fiber optic remote reading encoder

US Patent 7167297 Micromirror array

US Patent 7173227 Laser beam processing apparatus

US Patent 7173229 Solid state imager

US Patent 7173231 Chip scale package structure for an image sensor

US Patent 7176428 Laser-based, multiphoton-excitation-type optical examination apparatus

US Patent 7176436 Method and apparatus for manufacturing a transistor-outline (TO) can having a ceramic header

US Patent 7176439 Method for manufacturing photodetector for weak light

US Patent 7176443 Optoelectronic sensor and process for detection of an object in a monitored area

US Patent 7176475 Adjusting apparatus, production processing system, and method of controlling adjusting apparatus

US Patent 7180042 Radiographic image input apparatus which obtains image correction values based on a size or version of a radiographic recording member

US Patent 7180084 Method and apparatus for high-throughput inspection of large flat patterned media using dynamically programmable optical spatial filtering

US Patent 7183535 Position-to-number electro-optical converter

US Patent 7189953 Signal processing circuit, image sensor IC, and signal processing method

US Patent 7189962 Semiconductor relay apparatus and wiring board fabrication method

US Patent 7189984 Object data input apparatus and object reconstruction apparatus

US Patent 7193197 Light detection device, imaging device and distant image acquisition device

US Patent 7193204 Multi-track optical encoder employing beam divider

US Patent 7193232 Lithographic apparatus and device manufacturing method with substrate measurement not through liquid

US Patent 7196303 CCD image sensor

US Patent 7196312 Non-volatile solid state image pickup device and its drive

US Patent 7196316 Portable electronic device with activation sensor

US Patent 7199343 Spatial optical memory

US Patent 7199354 Detector array for optical encoders

US Patent 7199386 System and method for detecting defects in a light-management film

US Patent 7199388 Liquid level detecting device

US Patent 7202491 Method for sensing wafers located inside a closed wafer cassette

US Patent 7205518 Method and arrangement for focusing in an optical measurement

US Patent 7205520 Portable air defense ground based launch detection system

US Patent 7205527 Apparatus for fanning out near infrared radiation in an automotive occupant position restraint system

US Patent 7205561 Media sensor apparatus using a two component media sensor for media absence detection

US Patent 7208718 Light sensing panel, and liquid crystal display apparatus having the same

US Patent 7208723 Image processing system which processes an image captured by an imaging device through a lens having a focus which is adjusted to a point beyond the glass

US Patent 7208724 Apparatus and method of detecting probe tip contact with a surface

US Patent 7211777 Confocal microscope apparatus to measure a stereoscopic shape of a sample

US Patent 7214927 Method and apparatus using liquid crystal light valve to filter incident light on a photodetector

US Patent 7214930 Pulse generator

US Patent 7214932 Resonator method and system for distinguishing characteristics of surface features or contaminants

US Patent 7217916 Optical encoder

US Patent 7220955 Three-dimensional imaging resonator and method therefor

US Patent 7220957 High intensity photic stimulation system with protection of users

US Patent 7220959 Differential color sensor without filters

US Patent 7220978 System and method for detecting defects in semiconductor wafers

US Patent 7223953 Image sensor and method of manufacturing the same

US Patent 7223955 Solid-state imaging element and imaging device with dynamically adjustable sensitivities and method thereof

US Patent 7223957 Sensor including circuitry for recovering time-varying information and removing DC offsets

US Patent 7223958 Device for and method of driving an electro-optical device

US Patent 7223959 Plasma absorption wave limiter

US Patent 7223960 Image sensor, an image sensor pixel, and methods of forming the same

US Patent 7223963 Optical encoder

US Patent 7223964 Integration of electronic data storage into a telecommunications component

US Patent 7227112 Method for setting the system parameters of a scanning microscope

US Patent 7227120 Area monitoring multi-beam photoelectric sensor

US Patent 7227122 Image processing apparatus and method for processing images

US Patent 7227123 Physical quantity measuring method using Brillouin optical fiber sensor

US Patent 7227166 System and method for associating container defect information to a specific path of manufacturing

US Patent 7230225 Image reading apparatus having an image sensor unit

US Patent 7230230 Apparatus for adjusting a signal and prohibiting adjustment of the signal based on a position of a movable member

US Patent 7230259 Optical coupling device including lead frame having a convexity and method of manufacturing the device

US Patent 7232986 Apparatus for detecting a pointer within a region of interest

US Patent 7233014 Medium detection apparatus and medium detection method

US Patent 7233015 System and method for detecting liquid flow from a nozzle in a semiconductor processing device

US Patent 7235766 Electromagnetic radiation generation based on an object characteristic

US Patent 7235767 Circuit arrangement for controlling illuminating means

US Patent 7235770 Method for calibrating deviation of OECFs and apparatus thereof

US Patent 7235773 Method and apparatus for image signal compensation of dark current, focal plane temperature, and electronics temperature

US Patent 7235776 Method and device for regulating a light source of a position-measuring unit

US Patent 7235792 Color-tuned volumetric light using high quantum yield nanocrystals

US Patent 7235806 Wafer edge with light sensor

US Patent 7236290 Electrophoretic medium with improved stability

US Patent 7238928 Photomultiplier with particular stem/pin structure

US Patent 7238930 Inspection device for mouth of container

US Patent 7244927 Control panel for a motor vehicle fascia, having at least one optically controlled rotary adjustment knob

US Patent 7244928 Optical encoder

US Patent 7247826 Optical pickup apparatus

US Patent 7247832 Signal processing circuit and method using analog voltage signal to pulse width modulation conversion

US Patent 7247834 Photoelectric sensor for detecting presence/absence of object

US Patent 7247838 Rain/moisture and object imaging system for vehicle

US Patent 7247842 Method and system for scanning apertureless fluorescence mircroscope

US Patent 7250591 Photonic crystal-based filter for use in an image sensor

US Patent 7250596 Circuit with an opto-electronic display unit

US Patent 7250597 Measuring and adjustment device for an alignment optical system and adjustment method thereof

US Patent 7253385 Microscope image acquiring system with separate microscope and imaging instrument controllers that operate cooperatively

US Patent 7253388 Assembly with self-alignment features to position a cover on a substrate that supports a micro component

US Patent 7253391 Optical sensor device and electronic apparatus

US Patent 7253393 Control of a photosensitive cell

US Patent 7253396 Cooled photodetector

US Patent 7256381 Driving an image sensor with reduced area and high image quality

US Patent 7256383 Optical sensor circuit, method of processing output signal of the same, and electronic apparatus

US Patent 7256389 Glass bottle inspection machine

US Patent 7259363 Circuit arrangement and methods for a remote control receiver having a photodiode

US Patent 7259383 Optical transducer for detecting liquid level

US Patent 7262401 Active pixel sensor cell with integrating varactor and method for using such cell

US Patent 7262402 Integrated imager circuit comprising a monolithic array of single photon avalanche diodes

US Patent 7262403 Safety light grid

US Patent 7262404 Photodetector manufacturable by semiconductor processes

US Patent 7262405 Prefabricated housings for microelectronic imagers

US Patent 7265327 Photodetecting sensor array

US Patent 7265333 Light-receiving circuit

US Patent 7265336 Encoder utilizing a reflective cylindrical surface

US Patent 7265337 Sensing apparatus

US Patent 7265338 Photoelectric encoder using an incoherent semiconductor light source

US Patent 7265370 Sensing light

US Patent 7268331 Solid-state imaging device, method for driving the same, and camera

US Patent 7268334 Image sensor device and a method for outputting digital signals

US Patent 7268338 Imaging array having variable conversion gain

US Patent 7268342 Determination of optical properties of a device under test in both directions in transmission and in reflection

US Patent 7268343 Method and system for detecting defects

US Patent 7268360 Method and apparatus for self-referenced dynamic step and scan intra-field scanning distortion

US Patent 7271375 Photodetectors array with isolated pixels and storage grid, hybridized on a readout circuit

US Patent 7271380 Color input scanner calibration system

US Patent 7271381 Device to detect individual moving objects having very small dimensions

US Patent 7274009 Frame-shuttered CMOS image sensor with simultaneous array readout

US Patent 7276681 On-board light source based gain correction for semi-active laser seekers

US Patent 7276684 High gain photo cell with improved pulsed light operation

US Patent 7276686 Method and device for detecting the opening angle of the shutter of an adjustable rotating shutter in a film camera

US Patent 7276719 Device for a goniometric examination of the optical properties of surfaces

US Patent 7279696 Optical information code reading apparatus using marker beam

US Patent 7282686 Image sensor with improved photo sensitivity

US Patent 7282689 Optical fiber receiver having an increased bandwidth

US Patent 7282691 Method for determining wavelengths of light incident on a photodetector

US Patent 7282694 Optical navigation system having a ring pixel array

US Patent 7282695 Active search sensor and a method of detection using non-specular reflections

US Patent 7282697 High sensitivity fibre optic vibration sensing device

US Patent 7282701 Sensor for use in a lithographic apparatus

US Patent 7282729 Fabry-Perot resonator apparatus and method for observing low reflectivity surfaces

US Patent 7285766 Optical positioning device having shaped illumination

US Patent 7285768 Color photodetector array

US Patent 7289705 Cable having signal conductors surrounding optically transmissive core remote imaging system

US Patent 7291822 Amplification with feedback capacitance for photodetector signals

US Patent 7291824 Photosensing throughout energy range and in subranges

US Patent 7291825 Capacitance type physical quantity sensor

US Patent 7291826 Image sensor with a conjugate lens arrangement

US Patent 7294815 System and method for generating positional and orientation information of an object

US Patent 7294816 LED illumination system having an intensity monitoring system

US Patent 7294817 System and methods for determining nonuniformity correction parameters in detector-array imaging

US Patent 7294821 Optical module

US Patent 7297913 Module for a laser measuring device

US Patent 7297916 Optically improved CMOS imaging sensor structure to lower imaging lens requirements

US Patent 7297919 Solid-state image pickup device and image pickup camera having shifted wiring openings

US Patent 7297921 Photodetection circuit and confocal microscope that has it

US Patent 7297922 Optical receiver protection circuit

US Patent 7297931 Method and apparatus to effectively reduce a non-active detection gap of an optical sensor

US Patent 7297934 Optical system

US Patent 7297935 Position-measuring device

US Patent 7297950 Transmission electron microscope specimen and method of manufacturing the same

US Patent 7297961 Fluorescence microscope and observation method using the same

US Patent 7297971 Alignment systems and methods for lithographic systems

US Patent 7297974 Radiation image recording medium and image displaying medium

US Patent 7301134 Electro-optical focal plane array digital sensor system

US Patent 7301135 Photodetector having an electrostatic recording body and photodetecting method thereof

US Patent 7301136 Method for operating a photoelectric sensor arrangement with inverting and shifting a received signal and corresponding sensor

US Patent 7301138 Method and apparatus for dual polarization imaging

US Patent 7301140 Scanning device for scanning a scale graduation, and position measuring system utilizing the same

US Patent 7301165 Methods and apparatus for inspecting an object

US Patent 7304285 Method and system for shaping a spatial response of a spatial filter

US Patent 7304290 Optical image reader having a replaceable optical array panel

US Patent 7307266 Method and apparatus for an optically clocked optoelectronic track and hold device

US Patent 7309853 Method for controlling a bias voltage applied to an avalanche photodiode

US Patent 7309873 Raindrop sensor

US Patent 7312429 Method and apparatus of using optical distortion in a directed countermeasure system to provide a variable field of view

US Patent 7312433 Measuring device and method for detecting objects interrupting a beam of radiation

US Patent 7312435 Determination of a physical state of an optical device

US Patent 7312437 Displacement sensor, method for detecting the optimal reference position, and method for judging stability of detecting the reference position of displacement sensor

US Patent 7312445 Pyramid-shaped near field probe using surface plasmon wave

US Patent 7315014 Image sensors with optical trench

US Patent 7317179 Systems and methods to shape laser light as a homogeneous line beam for interaction with a film deposited on a substrate

US Patent 7317181 Light-emitting unit and method for producing same as well as lead frame used for producing light-emitting unit

US Patent 7317194 Microscope for performing multiple frequency fluorometric measurements

US Patent 7317195 Quantitative transmission/emission detector system and methods of detecting concealed radiation sources

US Patent 7319216 Light receiving unit and image taking apparatus

US Patent 7319217 Semiconductor image sensor module, method for manufacturing the same as well as camera and method for manufacturing the same

US Patent 7321112 Optical elements, related manufacturing methods and assemblies incorporating optical elements

US Patent 7321113 Precision material-handling robot employing high-resolution, compact absolute encoder

US Patent 7321672 Image reading apparatus and image reading system equipped with the image reading apparatus

US Patent 7323670 Laser operation for survey instruments

US Patent 7323671 Method and apparatus for varying a CMOS sensor control voltage

US Patent 7323672 Light sensor structure with dark current compensation

US Patent 7323673 Modulated laser light detector with discrete fourier transform algorithm

US Patent 7323680 Optical deflection probe and optical deflection probe device

US Patent 7323705 Liquid level measurement

US Patent 7326900 Two-dimensional weak radiation detector with a detection means based on orthogonal modulation

US Patent 7326903 Mixed analog and digital pixel for high dynamic range readout

US Patent 7326905 Photodetector and optical receiver

US Patent 7326906 Digital readout system

US Patent 7326909 Angle-error correction algorithm

US Patent 7326910 Multiple-optical-axis photoelectric sensor

US Patent 7326911 Detecting and thwarting content signals originating from theatrical performances

US Patent 7326914 Light grid for measuring an object

US Patent 7326915 Wavelength stabilization for broadband light sources

US Patent 7326919 Optical encoder

US Patent 7326920 Multi function peripheral having radio reader and writer for communicating with IC chips

US Patent 7326945 Dose transfer standard detector for a lithography tool

US Patent 7326948 Beam modifying device, lithographic projection apparatus, method of treating a beam, and device manufacturing method

US Patent 7327911 Optical detector configuration and utilization as feedback control in monolithic integrated optic and electronic arrangements

US Patent 7329848 Photo sensor, display panel having the same and display device having the display panel

US Patent 7329851 Photodetector having a photosensitive region and two-dimensional pixel arrangement

US Patent 7329853 Spectrally tunable detector

US Patent 7329857 Side-emitting fiber optic position sensor

US Patent 7329858 Optical encoder and electronic equipment having same

US Patent 7329859 Photoelectric encoder

US Patent 7329861 Integrally packaged imaging module

US Patent 7329888 Alignment systems and methods for lithographic systems

US Patent 7332704 Photosensitive button structure

US Patent 7332706 Detecting and thwarting imaging systems at theatrical performances

US Patent 7332707 Aisle width sensor for mobile storage systems

US Patent 7332708 Optical encoder

US Patent 7332733 System and method to correct for field curvature of multi lens array

US Patent 7335866 Method for improving depth discrimination in optical reproduction systems

US Patent 7335868 Exposure control system and method for an image sensor

US Patent 7335871 Low power switching for antenna reconfiguration

US Patent 7335872 Photocurrent amplifier circuit and optical pick-up device

US Patent 7335873 Light condensing method and light condenser as well as near-field optical microscope and storage device formed by applying the same

US Patent 7335874 Method and apparatus for generating a circularly polarized illumination beam

US Patent 7335876 Scanning device for carrying out a 3D scan of a dental model, sliding panel therefore, and method therefor

US Patent 7339147 System and method for automatic focusing of images

US Patent 7339148 Confocal microscope

US Patent 7339150 Imaging unit and image reading apparatus

US Patent 7339154 Level detector

US Patent 7342211 Image sensor and method of manufacturing the same

US Patent 7342213 CMOS APS shared amplifier pixel with symmetrical field effect transistor placement

US Patent 7345266 Optical medium judging method for avoiding the collision of an objective lens with a disk

US Patent 7345267 Optical system having element for correcting aberration of mirror and optical pickup apparatus employing the same

US Patent 7345271 Optoelectric sensing device with common deflection device

US Patent 7345273 Integrated optical encoder

US Patent 7348528 Distance measuring system

US Patent 7348531 Photoelectric conversion device and image pickup device using electron emission devices

US Patent 7348534 Method for controlling active pixel elements and active pixel arrays having a column-read transistor for reading signals

US Patent 7348538 Methods and systems for detecting proximity of an object

US Patent 7348544 Optical encoder with discontinuous optical grating

US Patent 7348545 System and method for optical encoding on two opposed surfaces of a pattern medium

US Patent 7348548 Image forming apparatus and image forming method

US Patent 7348551 Remote-control light receiving unit and electronic apparatus using the same

US Patent 7351945 Alignment among elements in an image sensor

US Patent 7351946 Semiconductor integrated circuit device and imaging system

US Patent 7351949 Optical generic switch panel

US Patent 7355162 Optical wavelength measuring device using guiding body and diffractive structure

US Patent 7355165 Optical encoder and method for using same

US Patent 7355194 Optical device and turbidity detection apparatus using same

US Patent 7356238 Optical fiber measuring module having base member holding optical fiber cable

US Patent 7358477 Method of optimization of measurement time for optical mouse sensor

US Patent 7358479 Method and computed tomography gantry for measurement of rotation angle of rotor

US Patent 7358482 Packaging structure of a light-sensing element and fabrication method thereof

US Patent 7361874 Auto focusing mechanism of surveying instrument

US Patent 7361876 Line head and image forming apparatus

US Patent 7361877 Pinned-photodiode pixel with global shutter

US Patent 7361878 Image display apparatus and image pickup apparatus with two dimensional scanning

US Patent 7361882 Method and apparatus for providing non-linear, passive quenching of avalanche currents in Geiger-mode avalanche photodiodes

US Patent 7361885 Two-dimensional image detector

US Patent 7361920 Substrate processing apparatus and transfer positioning method thereof

US Patent 7365299 Method and apparatus for providing flexible photodetector binning

US Patent 7368695 Image sensor package and fabrication method

US Patent 7368696 Generation and storage of column offsets for a column parallel image sensor

US Patent 7368698 Imaging device with reduced row readout time and method of operating the same

US Patent 7368701 Optical channels for multi-level metal optical imagers and method for manufacturing same

US Patent 7368703 Optoelectronic input device, method for production of such a device, and method for measuring the movement of an object with the help of such a device

US Patent 7368725 Optical radiation sensor system having a radiation window with a non-circular opening

US Patent 7372015 Beam detector and light scanner unit having the same

US Patent 7375332 Laser-based irradiation apparatus and method to measure the functional dose-rate response of semiconductor devices

US Patent 7378631 Image projection apparatus for adjusting white balance in consideration of level of light emitted from LED and method thereof

US Patent 7378635 Method and apparatus for dark current and hot pixel reduction in active pixel image sensors

US Patent 7381942 Two-dimensional optical encoder with multiple code wheels

US Patent 7385167 CMOS front end process compatible low stress light shield

US Patent 7385169 Contact image sensor and methods for aligning a light element array substrate thereof

US Patent 7385214 System and method for correcting systematic error of, and calibrating for, tilt angle of surface topology sensor head having plurality of distance sensors

US Patent 7390997 Microscope and auto focusing method for a microscope

US Patent 7391010 Photoelectric encoder and electronic equipment with increased resolution

US Patent 7397019 Light sensor module, focused light sensor array, and an air vehicle so equipped

US Patent 7403337 Focus adjustable head mounted display system and method and device for realizing the system

US Patent 7411206 Method and system for detecting the position of an edge of a web

US Patent 7582882 Solid state multi frequency fluorometric measurements system and method

US Patent 7763844 CCD scanner capable of scanning at an arbitrary angle with elastic swinging locking bar attached to chassis

US Patent 7798653 Projection display and optical aperture unit

US Patent 7835059 Tristate electrochromic device

US Patent 7988303 Image projection apparatus and image display system

US Patent 7993004 Projecting device

US Patent 7993012 Laser display system with optical feedback configured to reduce speckle artifacts

US Patent 7997738 Color wheel fabrication

US Patent 8007114 Small-sized projector with high heat dissipating efficiency

US Patent 8007116 Video projection device having a converter lens attachably and detachably provided