Selective Electric Switch Controlled By The Radiant Energy Responsive Device Patents (Class 315/154)
  • Patent number: 4727290
    Abstract: An automatic vehicle headlamp dimming control is the type having an operator controlled first voltage divider across a power supply, a light sensitive resistance connected in electrical series with an electrically controlled variable resistance in a second voltage divider across the output of the first voltage divider, an energizing circuit adapted to energize the headlamp system from the power supply at high or low intensity in response to the output of the second voltage divider compared to a fixed reference voltage and first electric feedback means from the energizing circuit to the electrically controlled variable resistance for producing hysteresis feedback.
    Type: Grant
    Filed: May 29, 1987
    Date of Patent: February 23, 1988
    Assignee: General Motors Corporation
    Inventors: Julian N. Smith, James M. Lawlis
  • Patent number: 4686425
    Abstract: A multicolor display device having seven illuminated optically stable states includes three triads of associated electro-optical components. In each triad, a light sensor is electrically coupled with a display light emitting diode and auxiliary light emitting diode. An optical feedback is established in each triad between the auxiliary light emitting diode and the light sensor tending to maintain its associated display light emitting diode either in the illuminated or extinguished condition. Light signals of respectively different colors emitted by three display light emitting diodes are blended to obtain a composite light signal of a color in accordance with the conditions of respective display light emitting diodes.
    Type: Grant
    Filed: August 4, 1986
    Date of Patent: August 11, 1987
    Inventor: Karel Havel
  • Patent number: 4587457
    Abstract: A multiple intensity lamp controller and lighting system utilizing a multiple filament lamp having a primary filament and a secondary filament coupled in series with each other and with a power source and having a variable impedance coupled across the secondary filament. The intensity of the multiple filament lamp is made comparatively bright when the value of the variable impedance is made comparatively low. Conversely, the intensity of the multiple filament lamp is made comparatively dim when the value of the variable impedance is made comparatively high.
    Type: Grant
    Filed: February 19, 1982
    Date of Patent: May 6, 1986
    Assignee: Minnesota Mining and Manufacturing Company
    Inventor: Peter A. Lind
  • Patent number: 4568858
    Abstract: A lamp control control circuit has triacs for controlling a current from an AC power supply and supplying a controlled current to lamps; a phase angle control unit for generating phase angle control pulses for a soft start; switching controllers for triggering the triacs in response to phase angle control pulses, respectively; and switches for selecting the lamp which is to be energized. The control circuit has additional switches for detecting the lamp selecting operation of the switches. The phase angle control unit is started in response to a signal from those switches.
    Type: Grant
    Filed: October 20, 1983
    Date of Patent: February 4, 1986
    Assignee: Olympus Optical Co., Ltd.
    Inventor: Koichi Matsui
  • Patent number: 4484106
    Abstract: The UV radiation triggered rail-gap switch applies a high voltage from a low impedance source to a low impedance load. The switch includes first and second parallel elongated electrodes spaced to form a uniform gap along their length. The first electrode is adapted to be connected to the high voltage source, while the second electrode is adapted to be connected to the low impedance load. When a voltage from the source is applied to the electrodes, one electrode will be positive relative to the other electrode. In addition, the cross-section of each of the electrodes is sufficiently smooth to prevent points of high field concentration between the electrode. This cross-section is defined by the field enhancement factor of each electrode which is preferably less than 1.5. The switch also includes an enclosure in which the electrodes are located and which contains a gas mixture for maintaining the breakdown threshold between the electrodes. A preferred gas mixture includes Ar, N.sub.2, and SF.sub.
    Type: Grant
    Filed: September 10, 1982
    Date of Patent: November 20, 1984
    Assignee: Canadian Patents & Development Limited
    Inventors: Roderick S. Taylor, Kurt E. Leopold, A. John Alcock
  • Patent number: 4403139
    Abstract: Circuits for selectively operating redundant light sources (lasers or LEDs) in lightwave communication systems are described.
    Type: Grant
    Filed: April 20, 1981
    Date of Patent: September 6, 1983
    Assignee: Bell Telephone Laboratories, Incorporated
    Inventor: Bernard C. De Loach, Jr.
  • Patent number: 4384238
    Abstract: Electronic strobe flash apparatus includes a first energizable flashtube arranged to project light for reflection from a surface to illuminate a scene indirectly, and a second energizable flashtube arranged to illuminate the scene directly. A sequencing circuit controls the energization of both flashtubes so that the ratio of the indirect flash to the direct flash reflected from the scene is constant in instances where the reflected flash is above a minimum level. For this purpose, a light-sensitive circuit, arranged to sense light reflected from the scene, is coupled to the sequencing circuit. The sequencing circuit causes the indirect flash to be produced first. The light-sensitive circuit causes the sequencing circuit to (1) quench the first flashtube to extinguish the indirect flash, and (2) fire the second flashtube to produce the direct flash, when the light-sensitive circuit senses that a predetermined fraction of a desired total amount of light has been reflected from the scene.
    Type: Grant
    Filed: December 15, 1980
    Date of Patent: May 17, 1983
    Assignee: Eastman Kodak Company
    Inventors: Roger J. Greenwald, Scott A. Brownstein
  • Patent number: 4247766
    Abstract: Solar illuminating compensating apparatus is disclosed whereby the interior of a building is illuminated to a substantially constant, predetermined level of light intensity by a combination of natural illumination from the sun and artificial illumination from electricity wherein the intensity of said artificial illumination is controlled by fully electronic means which increases the level of artificial illumination when the natural illumination is inadequate and vice versa.
    Type: Grant
    Filed: January 12, 1979
    Date of Patent: January 27, 1981
    Inventors: Carl Warren, Jimmie Arline, Julius LaPalme
  • Patent number: 4233545
    Abstract: This invention relates to an automatic lighting control system which employs a photosensitive detector in one leg of a bridge circuit for sensing the total effective level of both the natural and artificial illumination within an interior space. The unbalanced output of the bridge is fed into a pair of differential comparators for deriving a digital error signal representative of the level of illumination falling outside an acceptable range. A digital error signal is loaded into an intermediate shift register responsive to a clock signal. If an error signal of the type requiring a change in illumination is present, then a subsequent clock pulse will command a shift register to add or interrupt power to one or more lighting modules which supply artificial illumination to the interior space.
    Type: Grant
    Filed: September 18, 1978
    Date of Patent: November 11, 1980
    Inventors: Lee R. Webster, Gary J. Woods
  • Patent number: 4229664
    Abstract: In the disclosed apparatus, a photo diode has an electrical impedance representative of the ambient light intensity. An amplifier connects to this photo diode and converts the impedance to an analog signal whose magnitude indicates the ambient light intensity. The analog signal is compared via a first comparator with one reference voltage corresponding to the magnitude of analog signal that is generated by cloudy weather, and via another comparator to a reference voltage corresponding to the magnitude of signal that is generated at dusk. The first comparator operates to energize all window light in cloudy weather; and the second comparator operates to energize parking lot lights and electric signs at dusk. The second comparator also activates a timer which, after a manually selectable delay, de-energizes a uniformly distributed portion of all interior overhead lighting.
    Type: Grant
    Filed: March 15, 1979
    Date of Patent: October 21, 1980
    Inventors: Frederick H. Blake, Manfred K. Dittmann
  • Patent number: 4225808
    Abstract: Different portions of an area are selectively highlighted in response to observer proximity. An adjustable dimmer establishes the non-highlight illumination level for each area. The dimmer is overridden by observer-sensing circuitry to produce the highlight illumination level.
    Type: Grant
    Filed: June 5, 1978
    Date of Patent: September 30, 1980
    Assignee: Novitas, Inc.
    Inventor: Remo Saraceni
  • Patent number: 4177405
    Abstract: A photocell-controlled lighting system is disclosed. The system comprises a first photocell-controlled operated by a photocell, at least one night or decorative light adapted to be connected to a power source, at least one spotlight, also adapted for connection to the power source, a second relay adapted for connection to the power source and responsive to energization of the photocell-controlled relay for energizing the night or decorative light and to de-energization of the photocell-controlled relay when the photocell is illuminated by the lights of an automobile entering the driveway of a house for switching off the night or decorative light, and a third time relay adapted for connection to the power source and operated by the second relay when the lights of the automobile are switched off for switching of the spotlight for a predetermined time interval.
    Type: Grant
    Filed: May 5, 1978
    Date of Patent: December 4, 1979
    Inventor: Martial Chapdelaine
  • Patent number: 3989980
    Abstract: An automatic variable lighting device is provided with light responsive means, such as a photocell, for controlling the voltage applied to the lamp in response to ambient light conditions so that a nearly constant contrast between lamp intensity and ambient light intensity results.
    Type: Grant
    Filed: May 22, 1975
    Date of Patent: November 2, 1976
    Assignee: Exxon Research and Engineering Company
    Inventor: Elliot Berman
  • Patent number: 3984726
    Abstract: Ultraviolet light processors containing a plurality of ultraviolet light sources are improved by providing means for increasing the intensity of one lamp to compensate for a reduction in intensity of another lamp so that the total intensity of the system is substantially the same. If both lamps are located at the first foci of a conjugate reflector system, the intensity profile will be substantially reestablished.
    Type: Grant
    Filed: April 25, 1975
    Date of Patent: October 5, 1976
    Assignee: PPG Industries, Inc.
    Inventor: Warren J. Ramler