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Scientific American ; Jan. 2 edition, 1909
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| Number | Title | Issue Date |
| 7345669 | Photometric device of liquid crystal display and liquid crystal display A photometric device of liquid crystal display and a liquid crystal display in which photometry can be performed without relying upon manpower and the liquid crystal plane is shielded only at the time of photometry. The photometric device comprises a liquid crystal ... | 03/18/2008 |
| 7272252 | Automated system for combining bright field and fluorescent microscopy A method and apparatus for automated analysis of transmitted and fluorescently labeled biological samples, wherein the apparatus automatically scans at a low magnification to acquire images which are analyzed to determine candidate cell objects of interest. Once can... | 09/18/2007 |
| 7177454 | Automated detection of objects in a biological sample A method, system, and apparatus are provided for automated light microscopic for detection of proteins associated with cell proliferative disorders. ... | 02/13/2007 |
| 7099500 | Automated detection of objects in a biological sample A method, system, and apparatus are provided for automated light microscopic for detection of proteins associated with cell proliferative disorders. ... | 08/29/2006 |
| 7062168 | Bifurcated range stages to increase speed or dynamic range of measuring instruments and associated methods Multiple stage ranging circuitry for a measuring circuit includes a first ranging circuit that selectively amplifies an input signal by respective amounts according to the magnitude of the input signal thereto, and a second ranging circuit coupled to the output of t... | 06/13/2006 |
| 5773816 | Photodetector integrator circuit having a window comparator An improved photodetector integrator circuit is provided having a photodetector, such as a photodiode, which produces photocurrent responsive to incident illumination. The photodetector is coupled to an integrator stage which converts the photocurrent int... | 06/30/1998 |
| 5548398 | Illuminant discriminator providing detection of high efficiency illumination An illuminant discriminator distinguishes a range of separate illuminants, including high efficiency fluorescent lighting, by modifying the frequency response of a signal output from a photodetector. A switchable high pass filter coupled to the photodetec... | 08/20/1996 |
| 5272518 | Colorimeter and calibration system Apparatus for monitoring, converting and calibrating the spectra displayed by a colored object, using wavelength dispersion provided by a variable wavelength filter. The apparatus may serve as a spectrophotometer, as a colorimeter, or as a spectroradiomet... | 12/21/1993 |
| 5233517 | Early glaucoma detection by Fourier transform analysis of digitized eye fundus images Early glaucoma detection by a system and a method of fast Fourier transform analysis of digitized eye fundus images is disclosed. In this system, a red-free photograph of the eye fundus is first converted to digital form, and then the topography is furthe... | 08/03/1993 |
| 5115124 | Semiconductor photosensor having unitary construction A semiconductor photo-sensor comprising a photo-sensor area for converting an optical signal to an electrical signal, and a signal processing circuit for processing the electrical signal. The photo-sensor area and the signal processing circuit are formed ... | 05/19/1992 |
| 5025146 | Optical sensor line of amorphous or polycrystalline photoelectric material having a plurality of sensor elements Optical sensor line of amorphous or polycrystalline photo-electric material having a plurality of sensor elements. An optical sensor line of amorphous or polycrystalline photo-electric material having a plurality of sensor elements, whereby it is provided... | 06/18/1991 |
| 4914468 | Light measuring device A light measuring device calculates and displays a proper exposure condition even when the combination of shutter speed and aperture is predetermined by using a flashlight component and a measured light data.... | 04/03/1990 |
| 4838698 | Extinction type detector An extinct type detector which detects and determines a concentration or density of a gas or vapor in a space on the basis of an attenuation of light due to the gas or vapor present within the space. The detector of this feature of the invention operates in su... | 06/13/1989 |
| 4808811 | Light integrating circuit for use in a light measuring device which is accurate for both low and high light values A light measuring circuit including a light sensing device for sensing light and producing a signal representative of the light sensed, a compressing circuit for compressing the signal, a capacitor having one terminal connected to a predetermined voltage,... | 02/28/1989 |
| 4660075 | Color information detecting device A color information detecting device comprising a plurality of color detecting apparatus for detecting respective different color lights from each other, converting apparatus for producing an output in non-linear relation to the input signal, changeover a... | 04/21/1987 |
| 4639134 | Process and circuit arrangement for amplifying an input current To amplify an input current present at the input of a circuit arrangement with a feedback-coupled operational amplifier, two virtually equal potentials are built up in two different current paths with a common summing point. By means of the potentials, a ... | 01/27/1987 |
| 4518258 | Colour analyser A color analyser measuring the light intensities of at least three different colors within the spectrum of the incident light, and relating these measurements to values programmmed before. Those color components of the incident light that have to be influ... | 05/21/1985 |
| 4498753 | Photometric apparatus for cameras A photometric apparatus for a camera comprises a reference voltage circuit; an operational amplifier including a photoelectromotive element for photometry, an output terminal of said reference voltage circuit and an input terminal of said amplifier being ... | 02/12/1985 |
| 4492858 | Photometric circuit having a plurality of photoelectric transducer elements capable of being selectively enabled for photometry A photometric circuit comprises an operational amplifier including a plurality of differential amplifiers, a constant current bias circuit for supplying a constant current bias to the differential amplifiers, and a bias control switching circuit which sel... | 01/08/1985 |
| 4465354 | System and method for calculating a light information value A system disclosed is for calculating a light information value, such as an f/stop number, which is determined by a number of light sources such as strobes. The system calculates an optimum f/stop number for each of the strobes as the strobes are fired on... | 08/14/1984 |
| 4442381 | Auto strobe control circuit An auto strobe control circuit comprising a flash stopping signal generating circuit for measuring the luminance of an object exposed to light emitted from a flash tube by a photometric circuit, sending the obtained photometric value, film sensitivity inf... | 04/10/1984 |
| 4433914 | Exposure meter Disclosed herein are system and apparatus for providing an indication of proper photographic exposure for lighting conditions which include both flash and continuous light sources. An optical sensor provides a signal representative of instantaneous existi... | 02/28/1984 |
| 4390258 | Photomeric circuit for camera A photometric circuit includes a differentiator arranged in cascade connection with an integrating circuit including an integrating capacitor which directly integrates a photocurrent produced by a photoelectric transducer element which is used for photome... | 06/28/1983 |
| 4390266 | Exposure apparatus for electronic duplicator An exposure apparatus for an electronic duplicator including a first light-receiving element for receiving light reflected by a reference reflector plate or by an original and a second light-receiving element for receiving light reflected from an image fo... | 06/28/1983 |
| 4338033 | Densitometer A densitometer comprising a recorder so adapted as to be capable of recording a set of analytical data obtained with a photometric system twice at a definite recording interval, an index arranged at a position apart by a distance equal to said recording i... | 07/06/1982 |
| 4332469 | Optical multimeter An improved light intensity measuring device includes a temperature compensating logarithmic amplifier that changes photodetector currents which have been converted from AC to DC to a voltage which drives an analog to digital converter. The resulting digi... | 06/01/1982 |
| 4309604 | Apparatus for sensing the wavelength and intensity of light Disclosed is a solid state wavelength detection system responding to output signals derived from a photoelectric semiconductor device. The photoelectric semiconductor device comprise at least two PN junctions formed at different depth from the surface of ... | 01/05/1982 |
| 4306807 | Light measuring system In the disclosed system, a light measuring circuit having a logarithmical amplifier, is constructed to produce pulses at a frequency corresponding to the output of the light measuring circuit. Pulses are counted during a time interval corresponding to the... | 12/22/1981 |
| 4249825 | Method and apparatus suitable for ocular blood flow analysis Glaucoma and other diseases may be detected by the analysis of angiograms to determine ocular blood flow. Using rapid sequence photography an ocular image is recorded on successive film frames. To determine the optical density of the film at selected imag... | 02/10/1981 |
| 4247186 | Photometric circuit for camera A photometric circuit for a camera including a first operational amplifier with a photo-electric element connected between its inverted and non-inverted input terminals and, a logarithmic compression diode connected between the output terminal and the inv... | 01/27/1981 |
| 4241279 | Control circuit for an automatic electronic flash light device In an automatic electronic flash light device, a light measuring circuit includes an operational amplifier, a photosensor connected between the positive and negative inputs of the operational amplifier and a diode for log-compression connected in a feedba... | 12/23/1980 |
| 4229108 | Optical densitometer In a preferred embodiment of the present invention, an optical densitometer is provided having an improved output scale resolution. An output scale reading from 0.000 to 4.000, having a resolution to 0.001, is obtained by improved method and apparatus for... | 10/21/1980 |
| 4229107 | Optical densitometer In a preferred embodiment of the present invention, method and apparatus are provided for converting an input light intensity representing an optical density to a standard industry scale reading. A photomultiplier tube is operated with a constant anode cu... | 10/21/1980 |
| 4207533 | Electronic photometer An economical Cds photoresistor is connected to the input of an operational amplifier. Logging diodes are connected in a feedback configuration with the operational amplifier through a galvanometer meter. The log of the ratio of the input currents to the ... | 06/10/1980 |
| 4199753 | Integrated circuit for detecting changes in light intensity An integrated circuit employing a photo-diode activates an alarm when an intruder causes a change in the ambient light patterns by more than about 5% in an area under surveillance. The circuit includes a voltage regulator for supplying a back bias voltage... | 04/22/1980 |
| 4184151 | Circuit for digitally processing exposure information A circuit system designed to realize fully digitalized automatic exposure controls is provided in which the read-in brightness information is logarithmically compressed directly into a digital quantity without the aid of any diode element that exhibits a ... | 01/15/1980 |
| 4166696 | Photometer A photometer for providing a measurement of shutter speed or aperture setting corresponding to a preselected value of the other comprises a photodiode supplying a voltage proportional to the logarithm of the measured light intensity. This voltage controls... | 09/04/1979 |
| 4125330 | Photometric apparatus Photometric apparatus for use as a color analyser or color temperature meter or graphic arts photometer has a logarithmic photometer, means for storing the analogue output of the photometer combined with a reference signal, and means for comparing the sto... | 11/14/1978 |
| 4099885 | Digital display circuit for camera exposure meter A digital exposure meter display circuit for a camera includes a first oscillator 1 whose output controls the charging of an integrating capacitor 28 from a constant current source 3. When the capacitor charge reaches the level of a reference voltage from... | 07/11/1978 |
| 4072962 | Metering device A metering device comprises a photoelectric converter circuit for generating a first voltage corresponding to the brightness of a subject to be photographed. The converter circuit includes a photoelectric converter element and a first conductor element fo... | 02/07/1978 |
