Class 250/214DC - Digital circuitry

Subclass of Class 250 - Radiant energy
No. of patents: 49
Last issue date: 01/31/2012

Number	Title	Issue Date
8106346	Photodetector A photodetector includes a photoelectric conversion circuit that generates a first voltage by converting a first current generated in accordance with the illuminance of incident light into log-compressed voltage; a temperature compensation circuit that generates a s...	01/31/2012
7875842	Solid state image pickup element and camera system A solid state image pickup element includes a pixel unit having a plurality of pixels for photoelectric conversion disposed in a matrix shape and a pixel signal read circuit for reading pixel signals in the unit of a plurality of pixels from the pixel unit. The pixe...	01/25/2011
7408138	Analog-to-digital converter with noise compensation in CMOS image sensor An analog-to-digital converter includes an amplifying unit and a noise compensation unit. The amplifying unit amplifies a difference between a trip point voltage and a modified signal voltage. The trip point voltage has a first power noise component, and the noise c...	08/05/2008
7342213	CMOS APS shared amplifier pixel with symmetrical field effect transistor placement An image sensor includes a plurality of photodetectors arranged in an array; and a plurality of transistors that are functionally shared by the photodetectors, wherein a distance of each photodetector to an adjacent transistor is substantially the same. ...	03/11/2008
7327458	Spectral sensitivity composing system An output current from each pixel sensor can be extracted at an arbitrary ratio by a current divider. An arithmetic control unit sets the dividing ratio in correspondence to a color matching function. The current components are added together by a summing amplifier ...	02/05/2008
7326903	Mixed analog and digital pixel for high dynamic range readout An improved CMOS pixel with a combination of analog and digital readouts to provide a large pixel dynamic range without compromising low-light performance using a comparator to test the value of an accumulated charge at a series of exponentially increasing exposure ...	02/05/2008
7297917	Readout technique for increasing or maintaining dynamic range in image sensors The apparatus and method provide a readout technique and circuit for increasing or maintaining dynamic range of an image sensor. The readout technique and circuit process each pixel individually based on the magnitude of the readout signal. The circuit includes a ga...	11/20/2007
7288752	CMOS radiation-measuring circuit with a variable threshold A radiation measuring technique includes adjusting a threshold level of a radiation sensor in a radiation-measuring circuit and obtaining an output signal based on radiation dose sensed by the radiation sensor. ...	10/30/2007
7265332	Light monitor, electronic circuit incorporating a light monitor, and method of making the same A light monitor includes a single semiconductor substrate. A light to frequency (LTF) converter is on the single semiconductor substrate, a threshold comparator is on the single semiconductor substrate and coupled to an output of the light to frequency converter, an...	09/04/2007
7259838	Optical beam separation element, measuring apparatus and method of measuring An optical beam separation element for a measuring apparatus includes a reflecting component with a reflecting surface and an aperture for forming an optical channel common to the transmission and the reception directions in the optical beam separation element. The ...	08/21/2007
7251065	Image color balance for scanners using an illumination spectral sensor An image scanning system for producing an electronic version of a hardcopy element which is compensated for spectral content of an illumination source in the image scanning system, the image scanning system includes a sensor for receiving light containing the hardco...	07/31/2007
7214923	Light to PWM converter Conversion of light intensity to digital signal. Current output of a photodiode representing light intensity is converted to a voltage and provided as one input to a comparator. A sawtooth generator feeds the other comparator input. The output of the comparator is a...	05/08/2007
7202463	Higher dynamic range image sensor with signal integration Briefly, in accordance with one embodiment of the invention, a higher dynamic range image sensor may be implemented by comparing a voltage across the sensor to a threshold voltage during image capture. At the threshold voltage, a count may be registered and the imag...	04/10/2007
7164114	Digital pixel sensor with clock count output and operating method thereof A digital pixel sensor, comprising a first switch coupled between a first voltage and a first node, turned on or off by a rest signal to provide a first voltage to the first node when turned on; a light sensing unit coupled to the first node generating a transformat...	01/16/2007
7087879	Signal processing method and an evaluation circuit The invention relates to a method and to an apparatus for the processing of a received signal of an optoelectronic sensor, in particular of a light grid having a plurality of reception channels, with a comparison being carried out between the received signal and a s...	08/08/2006
7053392	Optical measuring apparatus for measuring objects on machines The present invention teaches a method and apparatus for making measurement of an object on a machine, such as a machine tool, using an optical measuring apparatus which includes a light source for generating a beam of light which is incident on a detector. A detect...	05/30/2006
7031059	Device for acquiring stereoscopic images The invention concerns a device for acquiring stereoscopic images comprising a primary mirror (1) or a near-parabolic mirror, a secondary mirror (2) located on the primary mirror optical axis between said primary mirror and its focal point, tertiary re...	04/18/2006
7013036	Image sensing apparatus and method of controlling image sensing Signals obtained from a sensor array that includes a plurality of energy transducers are processed. A converter used in this processing generates a plurality of converted signals by applying processing to signals from the energy transducers on a block by block basis...	03/14/2006
6974942	Receiving apparatus, transmitting apparatus, and communication system A receiving apparatus and transmitting apparatus capable of reliably transmitting and receiving a high speed optical signal and a communication system using the same, wherein provision is made of a transmitting apparatus comprising a conversion circuit for convertin...	12/13/2005
6914229	Signal offset for prevention of data clipping in a molecular array scanner A method and system for preventing signal clipping in a molecular array scanner by adding an offset signal to the signal generated by the photodetectors and initial stages of signal processing within a molecular array scanner in order to promote the signal above the...	07/05/2005
6838651	High sensitivity snap shot CMOS image sensor The present invention is directed to a solid state imaging device comprising a red pixel, a blue pixel, a first green pixel, a second green pixel, two analog-to-digital converters and a color interpolation circuit. The first analog-to-digital converter converts the ...	01/04/2005
6809804	System and method for providing improved event reading and data processing capabilities in a flow cytometer A system and method for use with a flow cytometer to improve event reading and data processing capabilities of the flow cytometer, while also providing efficient system configuration assessment capabilities. The system and method enables the flow cytometer to captur...	10/26/2004
6791485	Digital densitometer using light-to-frequency converter A densitometer using a light-to-frequency converter is disclosed. The converter outputs an oscillating signal with frequency characteristic of the incident light intensity. Digital controls may be input to the converter to set the frequency range of the output. The ...	09/14/2004
6664556	Method and apparatus for a phototransistor pulse width converter A system for measuring output voltage from a photodetector. The system includes a photodetector that generates a photodetector output signal, a ramp generator that generates a ramp signal and a comparator that outputs a signal level based on which of the ...	12/16/2003
6635859	Method and apparatus for light to frequency conversion A light to frequency converter includes a temperature coefficient generator, a programmable gain amplifier, and a current controlled oscillator having at least one photodiode configured to receive incident light, the at least one photodiode configured for...	10/21/2003
6617566	Apparatus and method for optical pattern detection An optical pattern detector in accordance with the principles of the present invention includes an optical sensor configured to sense a plurality of optical signals, an optical summer configured to receive and sum the sensed optical signals, and a sampler...	09/09/2003
6583400	Multichannel receiver circuit for parallel reception A multichannel receiver circuit is provided, which suppresses effectively crosstalk or interference between the electric signals transmitted in parallel through multiple channels at high speed and which improves the S/N for each channel. The receiver circ...	06/24/2003
6515784	Refractive index manipulating optical inverter An optical inverting system employs a first optical structure having an index of refraction that varies with the intensity of an incident beam and a second optical structure having a constant index of refraction, and forming an interface therebetween. An ...	02/04/2003
6444971	Method and system for compensating intensity fluctuations of an illumination system in a confocal microscope A method and system for compensating intensity fluctuations of an illumination system in a confocal microscope comprise a first and a second analog-to-digital converters for digitizing a first electrical signal corresponding to the light reflected from a ...	09/03/2002
6417503	Optical sensor circuit with output changing means An optical sensor circuit of the invention includes a photodiode, a reset switch, a capacitor for charge integration, an operational amplifier, reference voltage generating circuits connected to the operational amplifier via switches, and a reference volt...	07/09/2002
6194703	Photodiode array having a controllable dumping circuitry Spectrometers often use a so called charge balance photodiode array. This type of photodiode array uses parallel AID conversion in each channel of said photodiode array, whereby a charge provided by a photocurrent is accumulated at an integrator circuit, ...	02/27/2001
6144024	Digital densitometer using voltage-controlled oscillator, counter, and look-up table An optical densitometer includes a receiver adapted to produce an electrical output voltage characteristic of an optical density to be measured. A voltage-controlled oscillator produces a periodic signal having an output waveform with a frequency and peri...	11/07/2000
6137566	Method and apparatus for signal processing in a laser radar receiver An apparatus for receiving signals from a photodetector in a photodetector array. The apparatus has a number of comparators (e.g. 5) connected to the photodetector. each photodetector in the array has a similar circuit connected. Each comparator compares ...	10/24/2000
6011252	Method and apparatus for detecting low light levels 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 integrator output more than two times during each integration pe...	01/04/2000
5850195	Monolithic light-to-digital signal converter A monolithic light-to-digital signal converter (1.10) includes a photodiode array (1.24) having a plurality of sections with each section producing a current signal in response to incident light, a current-to-digital signal converter circuit (1.28) for co...	12/15/1998
5742045	Apparatus using diode laser logic to form a configurable optical gate system Configurable Optical Gates (COGs) are used to transmit and receive optical signals similar to an interconnect device as well as perform a logic function on those signals (they are smart pixels). COGs consist of a laser with an intracavity modulator, an in...	04/21/1998
5712475	Light receiving circuit with variable threshold circuit A light receiving circuit provided with an amplifier for amplifying an output signal of a semiconductor light receiving element is disclosed. The amplified electrical signal is first inputted to the inverting input terminal of a comparator. An output volt...	01/27/1998
5581074	Inspection apparatus with stroboscope intensity compensation features A stroboscope is employed as the lighting source for a video camera, the output of which is converted into a signal from which a fault in the object scanned is detected. The stroboscope is controlled in response to a portion of the output voltage of the v...	12/03/1996
5192968	Photometer A photometer of a camera employs a MOS-type CPU having an open drain type transistor whose drain serving as an output terminal, a CMOS input terminal, and an input gate inverting an input with a value exceeding a predetermined potential. In the photometer...	03/09/1993
5109358	Optical flip-flop circuit An optical flip-flop circuit which includes an electrical power source for providing an electrical signal, a light-receiving element provided in series with the power source for switching the electrical signal in response to an optical signal, a light-emi...	04/28/1992

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Class 250/214DC - Digital circuitry