With Light Standard Patents (Class 356/230)
  • Patent number: 10061086
    Abstract: A beam distributor includes a beam entrance and multiple beam exits. The beam distributor includes: a rotatable cylindrical member; at least two multiple reflectors shifted from each other; a rotation mechanism that rotates the multiple reflectors; a fixing mechanism that fixes the reflectors; a reflector position sensing mechanism; a light absorber; and a control unit. The control unit controls the rotation mechanism to rotationally move a rotational position about the cylindrical member to a position where a laser beam is to be reflected on the reflector toward a selected beam exits, a position where the laser beam is to pass through between adjacent reflectors to be absorbed by the light absorber, or a position where the laser beam is to be reflected on the reflector and absorbed by the light absorber. The control unit controls the fixing mechanism so as to fix rotational movements of the reflectors.
    Type: Grant
    Filed: October 18, 2017
    Date of Patent: August 28, 2018
    Assignee: FANUC CORPORATION
    Inventor: Takanori Sato
  • Patent number: 9970887
    Abstract: Slit light is irradiated onto an object to be photographed (for example, an automobile body) in order to obtain a source image. Next, either one of a maximum value filtering process or a minimum value filtering process is performed on the source image to thereby obtain a first filter-processed image. Furthermore, after obtaining a second filter-processed image by carrying out a remaining one of the minimum value filtering process or the maximum value filtering process with respect to the first filter-processed image, a difference is determined between the second filter-processed image and the source image, and a difference image is obtained. Thereafter, a binarization process is implemented with respect to the difference image.
    Type: Grant
    Filed: June 5, 2017
    Date of Patent: May 15, 2018
    Assignee: HONDA MOTOR CO., LTD.
    Inventor: Junichi Matsumoto
  • Patent number: 9937707
    Abstract: A measurement position presentation guide indicating a measurement position of the print material is generated on the basis of the print image data. To achieve the second object, print image data is analyzed to extract a plurality of measurement candidate regions that are candidates of a measurement position. The number of measurement positions to be allocated to each of a plurality of measurement candidate region groups of which image signal values are different is determined. The measurement candidate region group of which the image signal value is within a predetermined range with respect to the measurement candidate region group to which the measurement position has been allocated is excluded from targets of allocation of the measurement position.
    Type: Grant
    Filed: March 15, 2017
    Date of Patent: April 10, 2018
    Assignee: FUJIFILM CORPORATION
    Inventor: Shuhei Horita
  • Publication number: 20150098080
    Abstract: A surrogate challenge set including a plurality of containers containing a fluid, wherein at least one of the containers contains particulate matter; and reference probability-of-detection (POD) data for the at least one container containing the particulate matter is described. The fluid may be water containing at least about 0.5 wt % of a preservative, such as benzyl alcohol. The containers may be pharmaceutically acceptable containers such as vials, bottles, syringes, ampules and intravenous bags. The particulate matter may consist of a single particle having a particle size of at least about 50 ?m. A method of making the challenge set may include: disposing particulate matter in at least one of a plurality of containers comprising a fluid; generating probability-of-detection (POD) data for the plurality of containers; and including the probability-of-detection (POD) data in the challenge set. Methods of using the surrogate challenges sets are also provided.
    Type: Application
    Filed: October 7, 2014
    Publication date: April 9, 2015
    Inventor: Dan BERDOVICH
  • Publication number: 20150022898
    Abstract: A head-up display device and a self-checking method therefor are provided, which are able to suppress the direct output of a laser beam to outside. A reflecting means reflects an image generated by a scanning means and projects the image outside of a case, and an angle-adjusting means adjusts the reflecting means to a desired angle. After the ignition switch of the vehicle is turned on, a light-emitting means outputs a scanning laser beam, and the value of the current flowing to the light-emitting means is detected, or a first light intensity, which is the light intensity of the scanning laser beam, is detected. For a period extending at least from the output of the scanning laser beam by the light-emitting means to the establishment of a predetermined condition, the angle-adjusting means is controlled such that the reflecting means is set to a non-visible position at which the scanning laser beam is reflected inside the case.
    Type: Application
    Filed: December 5, 2012
    Publication date: January 22, 2015
    Inventors: Yasuhiro Yamakawa, Tsuyoshi Nakahara, Makoto Hada, Shun Sekiya, Kazuyoshi Yamada
  • Patent number: 8681327
    Abstract: Proposed is a technique for detecting a damaged VCSEL in a short time and at low cost. It shows the light emission spectrum of a multi-mode VCSEL before an ESD damage, and the light emission spectrum which shows several peaks corresponding to the structure of the active layer (MQW) and the upper and lower reflectors (DBR) is obtained. On the other hand, when the VCSEL which has an ESD damage has a damage in the active layer, the light emission spectrum which shows fewer peaks than the original number of peaks is obtained. Accordingly, the light spectrum analyzer analyzes the light emission spectrum, and it is determined that ESD damage has occurred when the number of peaks is equal to or smaller than a predetermined number, e.g., two peaks.
    Type: Grant
    Filed: November 2, 2010
    Date of Patent: March 25, 2014
    Assignee: Yazaki Corporation
    Inventors: Atsushi Nakata, Chiemi Yamagata, Satoshi Tanaka
  • Patent number: 8189182
    Abstract: A semiconductor integrated circuit device controlling a first light amount of light emitted from a light source based on a second light amount of light entering a light amount detection part so that the first light amount becomes a target level is disclosed. The semiconductor integrated circuit device includes a comparison part configured to compare a voltage corresponding to the second light amount and a reference voltage corresponding to the target level; and a drive current control part configured to control a drive current supplied to the light source based on the result of the comparison by the comparison part. The drive current control part includes a return light identification part configured to determine whether the second light amount includes a third light amount of return light occurring discontinuously.
    Type: Grant
    Filed: August 5, 2009
    Date of Patent: May 29, 2012
    Assignee: Ricoh Company, Ltd.
    Inventor: Mitsutaka Iwasaki
  • Patent number: 8130371
    Abstract: A reflection characteristic measuring apparatus capable of scanning a specimen surface of a sheet specimen at a high speed is provided. The reflection characteristic measuring apparatus includes a group of illuminating and light-receiving systems for directing illuminating light onto the specimen surface of the sheet specimen held by a specimen holding roller pair and for receiving reflected light from the specimen surface. The illuminating and light-receiving systems measure a spectral characteristic of the received reflected light. The illuminating and light-receiving systems are disposed over one-dimensional arrays of color samples which extend in the longitudinal direction of the sheet specimen, and scan the one-dimensional arrays in a direction opposite to a direction in which the sheet specimen is transported.
    Type: Grant
    Filed: May 19, 2011
    Date of Patent: March 6, 2012
    Assignee: Konica Minolta Sensing, Inc.
    Inventor: Kenji Imura
  • Publication number: 20100033714
    Abstract: A semiconductor integrated circuit device controlling a first light amount of light emitted from a light source based on a second light amount of light entering a light amount detection part so that the first light amount becomes a target level is disclosed. The semiconductor integrated circuit device includes a comparison part configured to compare a voltage corresponding to the second light amount and a reference voltage corresponding to the target level; and a drive current control part configured to control a drive current supplied to the light source based on the result of the comparison by the comparison part. The drive current control part includes a return light identification part configured to determine whether the second light amount includes a third light amount of return light occurring discontinuously.
    Type: Application
    Filed: August 5, 2009
    Publication date: February 11, 2010
    Applicant: RICOH COMPANY, LTD.
    Inventor: Mitsutaka Iwasaki
  • Patent number: 7649622
    Abstract: A test system and method are provided for testing in parallel radiant output of multiple light emitting devices. Generally, the method involves: (i) providing a system having a master, calibrated power meter (CPM), a source transfer standard (STS), and multiple secondary, test site power meters (TSPMs); (ii) determining a relationship between electrical power supplied to the STS and a radiant output therefrom as measured by the CPM; (iii) calibrating the TSPMs using the STS and the relationship between the power supplied to the STS and the radiant output therefrom as determined by the CPM; and (iv) positioning the devices undergoing test on a fixture of the test system and positioning the fixture relative to the TSPMs to test radiant outputs of the devices.
    Type: Grant
    Filed: June 30, 2007
    Date of Patent: January 19, 2010
    Assignee: Cypress Semiconductor Corporation
    Inventors: Ke-Cai Zeng, Steven Cummins, Edward Huber, Vincent Uy, Steven Sanders, Patrick Zicolello, Brett A. Spurlock
  • Patent number: 7623230
    Abstract: An apparatus including: an optical sensor comprising an optical transmitter and an optical receiver; and a calibration system configured to change calibration of the sensor when a measurement taken at the optical receiver, while the optical transmitter is on and the apparatus is in use, passes a test.
    Type: Grant
    Filed: October 23, 2007
    Date of Patent: November 24, 2009
    Assignee: Nokia Corporation
    Inventor: Niko Santeri Porjo
  • Patent number: 7622163
    Abstract: The invention is directed to a method by exposing at least a portion of a luminescent coating disposed on a surface of an article to ultraviolet light at one or more preselected wavelengths causing said luminescent coating to exhibit a luminescence spectrum, the luminescence spectrum exhibiting a plurality of intensity peaks that have been priorly determined to create a standard; determining the intensity of at least two peaks in the luminescence spectrum of the coating; determining a peak intensity ratio of the at least two peaks; comparing the peak intensity ratio determined with the standard; and, classifying the article according to whether or not the peak intensity ratio does or does not match the standard; wherein the luminescent coating comprises a particulate luminescent composition comprising a rare earth doped fluoride represented by the formula RExA1?xF2+x?2yOy wherein RE represents a three-valent rare-earth element, A is alkaline earth, 0.002?x?0.20, and 0?y?x.
    Type: Grant
    Filed: May 17, 2007
    Date of Patent: November 24, 2009
    Assignee: E.I. du Pont de Nemours and Company
    Inventors: Michael Karl Crawford, Kurt Richard Mikeska
  • Publication number: 20090244526
    Abstract: A low-cost alignment system suitable for aligning a wafer to a test fixture includes a bundle of optical fibers wherein at least one fiber serves to deliver illumination to the alignment target from an end thereof, and a plurality of receiver fibers, each having ends with a known spatial relationship to the end of the illuminator fiber. The ends of the fiber bundle have a known spatial relationship to the fixture. In some embodiments, the fiber bundle is disposed within the fixture such that there is an unobscured optical path between the wafer and the receiving and illuminating ends of the fibers. In some embodiments, the fiber bundle is coupled to a light source and a light sensor mounted on the fixture. In some embodiments the alignment target is one or more bonding pads disposed on a wafer.
    Type: Application
    Filed: December 1, 2008
    Publication date: October 1, 2009
    Inventor: Morgan T. Johnson
  • Patent number: 7517564
    Abstract: The invention is directed to a method by exposing at least a portion of a luminescent coating disposed on a surface of an article to ultraviolet light at one or more preselected wavelengths causing said luminescent coating to exhibit a luminescence spectrum, the luminescence spectrum exhibiting a plurality of intensity peaks that have been predetermined to create a standard; determining the intensity of at least two peaks in the luminescence spectrum of the coating; determining a peak intensity ratio of the at least two peaks; comparing the peak intensity ratio determined with the standard; and, classifying the article according to whether or not the peak intensity ratio does or does not match the standard; wherein the luminescent coating is a particulate luminescent composition comprising a rare earth doped fluoride represented by the chemical formula REx(CaaSrbBac)1?xF2+x?2yOy wherein RE represents a three-valent rare-earth element, 0.005?x?0.20, and 0?y?0.
    Type: Grant
    Filed: December 12, 2007
    Date of Patent: April 14, 2009
    Assignee: E.I. du Pont de Nemours and Company
    Inventors: Michael Karl Crawford, Kurt Richard Mikeska
  • Publication number: 20080024771
    Abstract: The invention is directed to a method by exposing at least a portion of a luminescent coating disposed on a surface of an article to ultraviolet light at one or more preselected wavelengths causing said luminescent coating to exhibit a luminescence spectrum, the luminescence spectrum exhibiting a plurality of intensity peaks that have been priorly determined to create a standard; determining the intensity of at least two peaks in the luminescence spectrum of the coating; determining a peak intensity ratio of the at least two peaks; comparing the peak intensity ratio determined with the standard; and, classifying the article according to whether or not the peak intensity ratio does or does not match the standard; wherein the luminescent coating comprises a particulate luminescent composition comprising a rare earth doped fluoride represented by the formula RExA1-xF2+x-2yOy wherein RE represents a three-valent rare-earth element, A is alkaline earth, 0.002?x?0.20, and 0?y?x.
    Type: Application
    Filed: May 17, 2007
    Publication date: January 31, 2008
    Inventors: MICHAEL KARL CRAWFORD, Kurt Richard Mikeska
  • Patent number: 6969843
    Abstract: The disclosed light standard system provides flat field illumination through the use of an integrating light chamber which is in communication with a microprocessor. The light chamber has at least one high performance light source, such as LED's, recessed within the walls and positioned to prevent light from directly exiting the chamber. A photosensor monitors multiple parameters within the chamber and interacts with the microprocessor to control intensity, temperature and wavelengths. The lights standard operates in benchmark, ratio light, linearity and transient response modes with all parameters being programmable and storable within said microprocessor.
    Type: Grant
    Filed: October 17, 2002
    Date of Patent: November 29, 2005
    Inventors: James M. Beach, Robert A. Ross, Josef K. Hudson
  • Patent number: 6909499
    Abstract: The invention concerns a light source having an apparatus for measuring the brightness of the illumination system of an optical viewing device, for example a microscope, in which at least one light sensor (3a) for measuring the intensity of the lamp (1) is arranged, for example, next to the optical waveguide (2). That measurement can be passed on to the user (9), either acoustically or visually, via an electronic unit (4) which compares the measurement to a definable threshold value.
    Type: Grant
    Filed: October 9, 2002
    Date of Patent: June 21, 2005
    Assignee: Leica Microsystems (Schweiz) AG
    Inventor: Ulrich Sander
  • Patent number: 6656518
    Abstract: To provide a thin film forming method and apparatus that can automatically form thin films having constant optical properties with high reproducibility Antireflection films are deposited on lenses 2a that are held by a coating dome 2 by vaporizing an evaporation material 4 by using an electron gun 3 The power to be applied to the electron gun 3 is controlled so that a transmission or reflection light quantity value that is measured at each time point by an optical film thickness meter 10 becomes equal or approximately equal to a standard light quantity value stored in a standard light quantity value data storing means
    Type: Grant
    Filed: September 30, 2002
    Date of Patent: December 2, 2003
    Assignee: Hoya Corporation
    Inventors: Yukihiro Takahashi, Kenichi Shinde
  • Publication number: 20030071991
    Abstract: The invention concerns a light source having an apparatus for measuring the brightness of the illumination system of an optical viewing device, for example a microscope, in which at least one light sensor (3a) for measuring the intensity of the lamp (1) is arranged, for example, next to the optical waveguide (2). That measurement can be passed on to the user (9), either acoustically or visually, via an electronic unit (4) which compares the measurement to a definable threshold value.
    Type: Application
    Filed: October 9, 2002
    Publication date: April 17, 2003
    Inventor: Ulrich Sander
  • Patent number: 6481369
    Abstract: To provide a thin film forming method and apparatus that can automatically form thin films having constant optical properties with high reproducibility. Antireflection films are deposited on lenses 2a that are held by a coating dome 2 by vaporizing an evaporation material 4 by using an electron gun 3. The power to be applied to the electron gun 3 is controlled so that a transmission or reflection light quantity value that is measured at each time point by an optical film thickness meter 10 becomes equal or approximately equal to a standard light quantity value stored in a standard light quantity value data storing device.
    Type: Grant
    Filed: October 12, 2000
    Date of Patent: November 19, 2002
    Assignee: Hoya Corporation
    Inventors: Yukihiro Takahashi, Kenichi Shinde
  • Patent number: 6294785
    Abstract: A method is presented for calibrating an infrared sensing device while in an orbit above a celestial body. The infrared sensing device measures a signal profile proportional to radiance emission from the atmospheric limb region in each of a plurality of spectral bandpass regions. The radiance emission from each of the spectral bandpass regions is primarily due to a gas in the atmospheric limb region. The gas must 1) have a known mixing ratio as a function of pressure, 2) cause spectral opacity to be different for each spectral bandpass region, and 3) cause spectral opacity to be non-linearly proportional to concentration of the gas in the atmospheric limb region over at least a portion of the signal profile. A temperature/pressure profile that is indicative of the signal profiles is determined. The temperature/pressure profile is indicative of absolute radiance emission which is then used to calibrate the infrared sensing device.
    Type: Grant
    Filed: September 8, 1999
    Date of Patent: September 25, 2001
    Assignee: G & A Technical Software Inc.
    Inventor: Larry L. Gordley
  • Patent number: 6016192
    Abstract: An external calibration system for a photo multiplier tube is described. The calibration system uses a light emitting diode and a photo cell wherein the diode is domed shaped. The light sensitive face of the photo multiplier tube is contained in the plane disposed at an acute angle to the longitudinal axis of the light emitting diode, and the photo cell is mounted substantially perpendicular to the longitudinal axis. A source of electrical energy then illuminates the light emitting diode over a range from, for example, 0 to 5 volts to generate light of known intensity and the light being generated is simultaneously measured by the photo cell and the light sensitive face of the photo multiplier tube. A feedback circuit is provided and associated circuitry so that a number of readings can be taken over a wide variety of light intensities to generate a calibration for the photo multiplier tube.
    Type: Grant
    Filed: December 18, 1997
    Date of Patent: January 18, 2000
    Assignee: Dynex Technologies, Inc.
    Inventor: Walter W. Taylor
  • Patent number: 6014207
    Abstract: When a vehicle enters into the lower portion of a shielding member, a headlamp is switched on, and a condition flag is set to Set 1 which represents a waiting state in which the vehicle exterior is estimated to become bright/dark intermittently. When the condition flag is set to Set 1, when the vehicle enters into the lower portion of the shielding member, the condition flag is set from Set 1 to Set 2 which represents an intermittent state in which the vehicle exterior becomes bright/dark intermittently with high possibilities. When the condition flag is set to Set 2, a switch-off extension time CFE and a switch-off delay time CTF make a time until the headlamp is switched off. As a result, the time until the headlamp is switched off is delayed, and the headlamp is required to remain switched on at portions where the vehicle exterior becomes bright/dark intermittently.
    Type: Grant
    Filed: July 17, 1998
    Date of Patent: January 11, 2000
    Assignee: Toyota Jidosha Kabushiki Kaisha
    Inventors: Tomonori Suzuki, Masachika Kamiya
  • Patent number: 5991014
    Abstract: A light sensing device for sensing the light output of a bulb in a lamp comprises a fiber-optic light guide having first and second ends and a photodetector. The first end is optically coupled to a projection of a bulb in the lamp and is adapted to pick up light transmitted through the projection from within the bulb. The second is optically coupled to the photodetector such that light exiting from the second end impinges on the photodetector to generate an output indicative of the light output of the bulb.
    Type: Grant
    Filed: April 25, 1997
    Date of Patent: November 23, 1999
    Assignee: Fusion UV Systems, Inc.
    Inventor: Jerome D. Frank
  • Patent number: 5946086
    Abstract: A mean optical power controller that controls power using a voltage controlled optical attenuator (VCOA) is disclosed. This controller uses a control loop in which a signal indicative of the present optical power level is compared to a signal indicative of the desired optical power level, with the difference then being used as input into the VCOA. This controller generates the required variety of signals indicative of the desired optical power level, or reference signals, without having to rely on a CPU. It does this by storing in a local storage means the voltage-values of the reference signals required to realize each supported user-defined optical power level. During the operation of the controller, the voltage-value corresponding to each selected power-level is passed to one or more DACs, where it is converted into a reference signal.
    Type: Grant
    Filed: December 10, 1997
    Date of Patent: August 31, 1999
    Assignee: Northern Telecom Limited
    Inventor: Paul Alan Bruce
  • Patent number: 5715049
    Abstract: When incident light is incident to a photodetector, photoelectrons are emitted therefrom and then multiplied to output an electric current signal. This current signal is integrated over a predetermined period of time in an integrator to be converted to a voltage signal. This voltage signal is converted to a digital signal by an AD converter. This digital signal is supplied to a histogramming memory, which generates a pulse height distribution of voltage signal. Based on a pulse height distribution N(h) generated with incidence of measurement-object light to the photodetector, a pulse height distribution of single photoelectron events p.sub.1 (h) generated by a generator of pulse height distribution of single photoelectron events, and pulse height distributions of k-photoelectron events p.sub.k (h) (k=2, 3, . . .
    Type: Grant
    Filed: November 14, 1996
    Date of Patent: February 3, 1998
    Assignee: Laboratory of Molecular Biophotonics
    Inventors: Shinji Ohsuka, Hisayoshi Takamoto
  • Patent number: 5715048
    Abstract: A calibration system for a measuring device utilizing a photo multiplier tube is provided. The calibration system is intended to provide a stable light source variable over a wide range of intensities which can be used to calibrate the PMT reading using a closed loop feedback circuit. The LED and a photo cell are disposed in a reference block chamber whereby the photo cell is in close proximity disposed perpendicular to the axis of the LED. The LED being dome shaped will direct light energy on to the photo cell, and also peripherally. The PMT is disposed adjacent the LED and at an angle to its longitudinal axis whereby light generated by the PMT simultaneously strikes both the photo cell and the PMT without reflection.
    Type: Grant
    Filed: November 22, 1995
    Date of Patent: February 3, 1998
    Assignee: Dynex Technologies, Inc.
    Inventor: Walter W. Taylor
  • Patent number: 5643535
    Abstract: A luminometer is described comprising a tray for receiving an array of sample wells, a photodetector assembly, and means for relatively moving the tray and photodetector assembly in one direction to align the sample wells received by the tray in a predetermined sequence with the photodetector assembly. The photodetector assembly of the luminometer includes a stage, a photodetection head having a detection aperture permitting passage of light therethrough, a means for mounting the photodetection head to the stage that permits movement of the head in a direction substantially normal to the direction of relative tray and photodetector assembly movement, and a means for biasing the photodetection head toward a selected sample well so that the detection aperture is substantially isolated from light emitted from adjacent wells. Internal and external photodetector calibration systems and a sample heater are also contemplated.
    Type: Grant
    Filed: May 11, 1995
    Date of Patent: July 1, 1997
    Assignee: Chiron Corporation
    Inventors: Rick T. Smethers, Brian D. Warner, Victor P. Burolla
  • Patent number: 5418419
    Abstract: A lamp for producing a spectral distribution which is substantially identical to daylight color temperature. The lamp contains a filament which, when excited by electrical energy, emits radiant energy at least within the visible spectrum with wavelengths from about 400 to about 700 nanometers, a reflector body with a surface to intercept and reflect the visible spectrum radiant energy which is positioned within the reflector so that at least 50 percent of the visible spectrum radiant energy is directed towards the reflector surface, and a coating on the surface of the reflector body from which the reflected radiance of each wavelength of visible spectrum radiant energy directed towards the reflector surface when combined with the visible spectrum radiant energy not directed towards the reflector surface produces a total light output in substantial accordance with a specified formula.
    Type: Grant
    Filed: March 22, 1994
    Date of Patent: May 23, 1995
    Assignee: Tailored Lighting Inc.
    Inventor: Kevin P. McGuire
  • Patent number: 5325171
    Abstract: A calibration system for periodically calibrating an optical instrument on board a satellite with reference light. In the disclosed system, a calibration unit has two photodetectors one of which is positioned near the light source which radiates reference light and the other near the aperture from which the reference light emerges toward optics of the instrument. Therefore, it is possible to discriminate between contamination or degradation of the optical instrument and contamination of the calibration unit. Two identical and independent calibration units are employed to provide redundancy and enhance the accuracy of calibration.
    Type: Grant
    Filed: September 18, 1992
    Date of Patent: June 28, 1994
    Assignee: NEC Corporation
    Inventor: Yukiharu Shimizu
  • Patent number: 5060118
    Abstract: An apparatus for "color mode switching," which enables duplication of daylight chromaticity for each color family. The present invention emits a selected spectral distribution of light which duplicates the effect of daylight, on a color-by-color basis. This effect is accomplished by a specific arrangement of specialized fluorescent and incandescent lamps which are switched (on/off) in a different pattern for each color family. The device has application anywhere color matching is required, including the after market for automobiles.
    Type: Grant
    Filed: April 6, 1989
    Date of Patent: October 22, 1991
    Assignee: Frank A. Arone
    Inventors: Richard J. Penrod, Roy H. McCullagh
  • Patent number: 4712089
    Abstract: Methods and apparatus for all-optical analog to digital conversion. An analog optical input signal is directed along a path comprising a series of level sensing means for determining whether its intensity is above or below a threshold value. The optical signals from successive level sensing means are directed in pairs to optical exclusive-or gates to provide a digital optical signal to at least one of a plurality of individual optical output means according to a designated digital coding system whereby the optical digital indication corresponds to the sensed level of intensity of the analog optical input signal. Apparatus comprising channel waveguides and integrated optical devices provide economical systems for high-speed computation and other uses.
    Type: Grant
    Filed: October 11, 1985
    Date of Patent: December 8, 1987
    Assignee: Battelle Memorial Institute
    Inventor: Carl M. Verber
  • Patent number: 4708477
    Abstract: A photometrical apparatus has a first light receiving element, and a second light receiving element less sensitive to temperature and other environmental influences than said first light receiving element whereby a value Pm of measured quantity of light from the subject is calculated from the following formula ##EQU1## Pr designates a quantity of light from a standard light source, Dr and Dm designate outputs of the first light receiving element generated by the light from the standard light source and the subject, Dpo and Dpt designate outputs of the first light receiving element generated by the light from the reference light source and the subject, and Dso and Dst designate outputs of the second light receiving element generated by the light from the reference light source and the subject.
    Type: Grant
    Filed: February 13, 1986
    Date of Patent: November 24, 1987
    Assignee: Tokyo Kogaku Kikai Kabushiki Kaisha
    Inventors: Yabusaki Kenji, Tozawa Hitoshi, Noda Akira, Ito Takashi
  • Patent number: 4636072
    Abstract: An improved method and apparatus for use in photometric testing of high intensity discharge lamps and luminaires is disclosed. The improved apparatus includes the creation of a mock high intensity discharge lamp having an incandescent emitting element replacing the arc plasma of the subject high intensity discharge lamp while carefully duplicating all other structural and electrical details of the lamp. The improved method incorporates the use of the mock high intensity discharge lamp to obtain accurate testing of the photometric qualities of the regular high intensity discharge lamp.
    Type: Grant
    Filed: September 6, 1983
    Date of Patent: January 13, 1987
    Assignee: National Service Industries, Inc.
    Inventor: Theodor G. Yahraus
  • Patent number: 4543558
    Abstract: A method and apparatus for converting radiant energy levels to digital data wherein an image sensor is provided having at least one row of sensor elements each including a light sensitive capacitor and an access switch and which changes state produces a corresponding binary output signal when a predetermined charge threshold is exceeded by the capacitor whose charge is a function of intensity and period of an illumination. The row of elements is first calibrated by illuminating same with a reference light source and sensing at a first frequency (F) such that approximately one half of the elements change state and counting the digital output signals corresponding to the changes of state to obtain a first number (B). Thereafter, the row is illuminated with an unknown light source which has a lower radiant energy level than that of the reference light source and senses at a frequency F/2. The digital output signals corresponding to the changes of state are counted to obtain a second number (A).
    Type: Grant
    Filed: March 14, 1983
    Date of Patent: September 24, 1985
    Assignee: Miles Laboratories, Inc.
    Inventor: James A. White
  • Patent number: 4537510
    Abstract: Apparatus for controlling output signals from two light detectors in a photometer. The sensitivities of the light detectors, or the gains in amplifiers for amplifying output signals from the light detectors are controlled in such a manner that the sensitivity characteristics and output characteristics of the two light detectors are in agreement with one another, to thereby improve the measuring accuracy thereof.
    Type: Grant
    Filed: December 9, 1982
    Date of Patent: August 27, 1985
    Assignee: Hitachi, Ltd.
    Inventor: Kenichiro Takahasi
  • Patent number: 4538218
    Abstract: A lighting control system is provided which utilizes a light responsive sensor means and a control system to respond to the skylight illumination while rejecting direct sunlight as a control parameter. The skylight illumination level is used to control lighting power controllers that can dim interior lighting equipment in a defined pattern to maintain a uniform light level at a work surface and to conserve electrical energy.
    Type: Grant
    Filed: November 3, 1983
    Date of Patent: August 27, 1985
    Assignee: Honeywell Ltd.
    Inventor: Francis M. Watson
  • Patent number: 4516852
    Abstract: This invention relates to a method and apparatus for measuring the exposure variation in the cross scan direction in an optical projector and scanning apparatus of the type that uses an annular aperture or slit. This measuring is achieved by measuring the light intensity from point to point along the arcuate illuminated area. Where the illuminated area is tapered so as to accommodate a pivoting carriage the system of this invention processes the intensity signal to yield a uniformity signal that only indicates departures from the ideal.
    Type: Grant
    Filed: January 6, 1984
    Date of Patent: May 14, 1985
    Assignee: The Perkin-Elmer Corp.
    Inventors: Raymond C. Liu, David A. Markle
  • Patent number: 4418399
    Abstract: A semiconductor memory system providing memory matrix area where many word lines and bit lines cross in the row and column directions. Memory cells are arranged at the intersections resulting in high integration density. A plurality of peripheral circuit blocks connected to adjacent plurality of word lines or bit lines. For example, the sense amplifiers and decoder circuits, etc., are sequentially arranged in files against the direction of the bit lines and word lines, respectively. Thereby, connections between the word lines or bit lines and the peripheral circuit blocks can be made without complicating the structure and using chip area ineffectively.
    Type: Grant
    Filed: December 15, 1980
    Date of Patent: November 29, 1983
    Assignee: Fujitsu Limited
    Inventor: Junji Sakurai
  • Patent number: 4023910
    Abstract: There is disclosed an evaluating circuit for use with a photoelectric transducer and an electronic photometer. The photometer comprises indicators, all of which are variable, and comprises a combining device arranged to combine by an inverse computing operation.
    Type: Grant
    Filed: December 11, 1975
    Date of Patent: May 17, 1977
    Assignee: Bolex International SA
    Inventors: Marc Niederhauser, Pierre Huguenot
  • Patent number: 3938896
    Abstract: A colorimeter includes an objective for focusing an object image on a first half of a viewing screen. A standard light reference beam is projected onto the second half of the screen. A moving shutter alternately blocks the first half then the second half of the screen. A light detector is responsive to the alternating images on the screen as they pass through color filters. The detector output may provide information of spectral distribution or color deviation of the object, relative to the standard reference.FIELD OF THE INVENTIONThe invention generally relates to colorimeters, and more particularly to a colorimeter for measuring color and spectrum distribution, based on the formation of an optical image of an object prior to measurement.BRIEF DESCRIPTION OF THE PRIOR ARTThe "narrow" definition of color flows from the rules set down by the C. I. E. (International Commission for Illumination) for the measurement of color on flat, uniform, opaque surfaces.
    Type: Grant
    Filed: April 4, 1974
    Date of Patent: February 17, 1976
    Assignee: Neotec Corporation
    Inventor: Paul J. Selgin