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7601940 |
Gain control system for visible light communication systems
An optical receiver having a photodetector, a variable gain amplifier, and a gain control circuit is disclosed. The photodetector generates a photodetector output signal related to an intensity of...
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7566859 |
Infrared ray switching device
An IR switching device, electrically connected to an apparatus, is provided. The IR switching device comprises an IR transmitter, an IR receiver, a processor, a controller. The IR transmitter is...
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7564014 |
Apparatus for detecting welding light and protecting eyes from glare and method for controlling the same
A welding light detection and anti-glare eye protection apparatus, which shields welding light generated in welding or cutting environments to safely protect eyes of a worker from the welding...
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7536114 |
Method and system for converting an optical received pulse train into an electrical output pulse train
The aim of the invention, which concerns a method and a system for converting an optical received pulse train into an electrical output pulse train, is to create a method and an associated circuit...
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7514666 |
Composite receiver assembly having a circuit board on which multiple receiver devices that operate on different sets of wavelengths are mounted
Multiple devices that operate at different wavelengths of light are incorporated into a single composite assembly to reduce the amount of space that is needed to incorporate the assembly into a...
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7495204 |
Remote control receiver device and ambient light photosensor device incorporated into a single composite assembly
An RC receiver device and an ambient light photosensor (ALPS) device are mounted on a single mounting device (e.g., circuit board or lead frame substrate) such that they are part of a single...
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7446292 |
Eye-protection device having dual high voltage switching
An auto darkening eye protection device comprising a shutter assembly and a control circuit. The shutter assembly is adjustable between a light state and a dark state. The control circuit comprises...
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7385170 |
Ambient light suppression circuit for photodiode receiver applications
An optical receiver circuit that effectively suppresses ambient light. A photodiode receives both desired higher frequency modulated optical signals, as well as the lower frequency or even DC...
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7381939 |
Optical cargo detection
A detector for detecting cargo in a container has a controller block, a transmitter for transmitting light into the field of view, a receiver for receiving reflected light, and a threshold...
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7372571 |
Color sensing apparatus
A colorimeter method and apparatus is described. The colorimeter includes a plurality of sensors/filter systems with non overlapping spectral responses, adequate for providing data capable of...
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7351947 |
System and method for ambient light sensor testing for an information handling system display
An ambient light sensor testing module running on an information handling system verifies that an ambient light sensor managing brightness of an information handling system display is active and...
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7161135 |
Multi-stage sensor for an auto-darkening lens for use in welding and method
A multi-stage control for an auto-darkening lens includes a first detector to detect initiation of welding and a second detector to detect continuation of welding after welding has been initiated....
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7002480 |
Deposit detector and control device using it
A deposit detector in which deposit on a detection surface has a surface shape effect, and generation of a flashing phenomenon caused by irregular reflection of the light incident on the deposit...
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6927385 |
Optical sensor and method of suppressing interference light therefor
An optical sensor includes a light transmitter for transmitting pulsed light signals and a light receiver for receiving them. In order to suppress the effects of interfering noise light, the light...
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6580064 |
Background rejection circuit
A background rejection circuit uses the harmonic content of an angularly narrow target to produce a signal. The signal is used to modulate an externally derived audio signal to produce a target...
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6483090 |
Glare protecting device and method of controlling thereof
A glare protecting device and a method of controlling thereof for protecting a worker's eyes from a light comprising: a temperature detector for generating a temperature detecting signal by...
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6429416 |
Apparatus and method of controlling a gated power supply in an image intensifier with a micro-channel plate
Apparatus for controlling a gated power supply of an image intensifier having a micro-channel plate includes a current-to-voltage converter coupled to the micro-channel plate operable to convert a...
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6414298 |
Reduced smearing optronic transceiver
In a semiconductor device ( 1 ) for the transmission-reception of modulated optical signals having a semiconductor substrate on which are monolithically integrated a transmitter ( 4 ) able to...
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6317200 |
Positional measurement with normalized signal processing
A measurement apparatus (10, 110) and methods to perform positional types of measurement with normalization respective to either or both of light beam (16, 116) intensity and measurement target...
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6317043 |
Perimeter monitoring system
A perimeter monitoring system is arranged to detect passage across a perimeter of an area. The system primarily includes an emitter, a retroreflector, a detector and an alarm. The emitter provides...
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6222177 |
Electrochromic element driver with negative output resistance
An electrochromic element driver has a feedback loop that imparts a negative output resistance wherein the drive voltage across the electrochromic element varies in response to changes in current...
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6172353 |
System and method for measuring low power signals
A method and apparatus for measuring very low light signals including integrating a signal from a photo diode, avalanche photo diode, photomultiplier tube or the like, digitally sampling the...
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6037580 |
Safety device for cooking appliance
Safety device composed of a radiation emitter, a radiation receiver disposed for receiving radiation which is produced by the emitter and which traverses a radiation path between the emitter and...
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6028516 |
Trigger circuit
A trigger circuit including a light source supplying a first beam of light having a first frequency, a frequency altering device positionable to receive the first beam of light. The frequency...
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5991467 |
Image reading apparatus containing light receiving transistors and switching transistors
An inexpensive, miniaturized and thin image reading apparatus reads various types of images, such as fingerprints. The apparatus includes a transparent substrate. A light-emitting unit emits light...
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5990628 |
Light level sensor for detecting the level of incident light and discriminating between natural and artificial light
A light level sensor for use in controlling the switching of artificial lighting. The sensor comprises a photoelectric transducer which provides an output signal at a level which is significant of...
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5959291 |
Method and apparatus for measuring low power signals
A method and apparatus for measuring very low light signals including integrating a signal from a photo diode, avalanche photo diode, photomultiplier tube or the like, digitally sampling the...
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5910653 |
Shelf tag with ambient light detector
The present invention relates to an electronic shelf display device which includes an optical device and an ambient light detector circuitry. The electronic shelf display device includes an...
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5892240 |
Wafer sensing apparatus for sensing wafer insertion
A wafer sensing apparatus for sensing whether a wafer is inserted in a wafer cassette. The wafer sensing apparatus includes a light emitting device for emitting light of a predetermined wavelength...
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5874731 |
Ambient light filter
An ambient light filter includes light emitting circuitry and optical detection circuitry. The detection circuitry is positioned to detect light from the emitting circuitry. A microprocessor is...
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5852292 |
Method of operating an optical light sensor
A method for operating an optical light sensor for the detection of objects present in the monitored region in which light signals are transmitted into the monitored region in specific time...
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5763873 |
Photodetector circuit for an electronic sprayer
An agricultural implement for spraying herbicide on weeds in a field without spraying herbicide on bare soil includes a photodetector circuit. The photodetector circuit includes a photodetector and...
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5747798 |
Photocell checker
A continuously active artificial light source, such as a light-emitting diode (LED), is supported in a housing that also contains a photocell, and is directed at the operating detection surface of...
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5717484 |
Position detecting system
A first light receiving portion and a second light receiving portion are provided on the upper surface of a moving body having driving wheels at an interval of a prescribed distance in a plane. The...
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5710424 |
Multiple field of view detector with background cancellation
The present invention relates to an apparatus and a method for detecting pulses of light energy from at least two fields of view. A first detector having a first bias detects a pulse received at a...
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5705807 |
Photo detecting apparatus for detecting reflected light from an object and excluding an external light componet from the reflected light
There is provided a photosensor having a photoelectric converter for converting incident light into a photoelectric current, and a function of removing noise light from imaging light including...
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5698845 |
Optical detection apparatus for detecting light interruption
The light selected by a selection circuit 3 at a light emitting side and emitted from a light emitting element 1 such as a LED is converted to a specifically modulated light by an oscillation...
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5665975 |
Optical detectior including an optical alignment block and method
A device and method for efficiently synthesizing diverse molecular products on substrates. A parent vessel 200 contains a suspension of substrates. The suspension is pressurized with argon and...
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5665961 |
Photoelectric switch for use with a machine control circuit
A photoelectric switch having a rectifier for converting a received AC voltage to a DC voltage, a transparent cover having a user friendly finger rest surface, means for generating a pulsed...
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5640006 |
Control circuit for a fail-safe multi-axis light beam type sensor
A multi-axis light beam type sensor with a simple fail-safe sensor system which stops when the sensor system is abnormal (logic value "0") is provided. The construction is such that scanning output...
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5600125 |
Compensation and status monitoring devices for fiber optic intensity-modulated sensors
Compensation and health monitoring techniques and devices for fiber optic intensity modulated sensors provide automatic adjustment of light intensity in order to maintain continuous calibration of...
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5594238 |
Touchless switch which discriminates between motion intended to toggle the switch and other forms of motion
A touchless switch using a single detector to measure ambient energy and reflected energy. The detector can detect objects in both the normal unsaturated ambient energy state or when ambient energy...
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5567931 |
Variable beam detection using a dynamic detection threshold
An apparatus for detecting obstructions includes a plurality of emitters for radiating beams of energy, a plurality of detectors for providing detector signals in response to the beams of energy...
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5532472 |
Photoelectric switch monitoring the duration of pulsed light to prevent false signals due to ambient conditions
A photoelectric switch includes a light emitting section emitting pulse light so that intensity of the emitted pulse light is sequentially increased. A light detecting section detects the pulse...
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5516293 |
Gaming machine coin hopper coin sensor
A coin hopper having an optical-electrical coin sensor with a light source and a light detector is provided. The coin hopper includes a coin transport disc, a coin trough, and a coin payout chute....
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5508511 |
Arrangement for and method of detecting an object in an area subject to environmental variations
Environmental variations in ambient light and temperature are eliminated in arrangements for and methods of detecting objects in areas exposed to such variations by generating a differential...
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5506715 |
Lighting system having a remotely controlled electric lamp and an infrared remote controller with improved infrared filter
A lighting system having an electric lamp controlled by an infrared remote controller. The remote controller incorporates a commercially available transmitter and receiver which reliably functions...
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5489983 |
Sensor for vehicle alignment system and apparatus using same
A system for measuring angular relationships of wheels of a vehicle includes a radiation source mounted with respect to a first wheel for providing a radiation signal, an image detector having an...
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5481104 |
Photodetector circuit with actively damped tuned input
A photodetector circuit is disclosed which can extract a carrier frequency signal from an optical beam. A photodiode is back-biased by a voltage supply, and the capacitance of the photodiode is...
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5473461 |
Wide dynamic range optical receiver
Ambient light and temperature fluctuations are suppressed in an optical receiver system by feeding the output of a photodiode directly to one input of a differential amplifier and, via a low pass...
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