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5012314 |
Liquid crystal display restoring apparatus
An apparatus for restoring a liquid crystal display element having a thin film transistor with a threshold voltage and controlling the brightness of the element includes a display driver for...
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5008525 |
Current monitoring circuit error compensation
In a measuring device including a magnetic-optic current transformer (2) defining an optical path having an input (4) and an output (6) and having an optical transmission characteristics such that...
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5006704 |
Optical scanner and method for generating and detecting a composite dot on a scanning medium
An optical scanner and method in which light beams from a plurality of sources are directed onto a medium to form a composite spot. The relative positions of the beams are detected and changed to...
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5006701 |
Sensor system with source regulation coupled to sensor circuit sensitivity
Sensor system for regulating machines, especially sewing machines, with a light barrier comprising a light emitter and a light receiver. The light emitter provided is an incandescent lamp supplied...
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4998043 |
LED stabilizing light source device
An LED stabilizing light source device comprises an LED, a drive circuit for driving the LED, a wavelength filter for filtering the light emitted from the LED, a light splitter for splitting the...
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4991968 |
Three dimensional object surface determination with automatic sensor control
A system for object surface determination in which the projector/detector sensor of the system is controlled by a control detector which is responsive to a plurality of different parts of a portion...
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4990763 |
Light beam recorder having beam duration and intensity controlled in accordance with scanning speed
A laser beam recorder arranged to record data with dots of a constant size, constant pitch and constant density, irrespective of possible differences in scanning speed between the middle and...
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4988857 |
Misconvergence measuring apparatus
This invention is concerned with apparatus for automatically measuring misconvergence in the production of color Braun tubes or color display apparatus using color Braun tubes. This misconvergence...
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4983884 |
Constant intensity light source for fiber optic testing
A stable fiber optic light source is produced by a supply circuit comprising a current-producing power source 10, a comparing means 20, phase shifter 30, transistor circuit 40, light-emitting diode...
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4981362 |
Particle concentration measuring method and device
The method and apparatus for measuring the particle concentration in a fluid that is passed between a reciprocally movable window and a single photodetector. A collimated beam of light is directed...
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4972077 |
Wavelength multiplexed optical transducer with a swept wavelength optical source
An optical transducer system for use with an optical transducer of the kind which produces a wavelength multiplexed optical output signal comprises a broadband optical source, and a tunable filter...
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4970380 |
Method for optical code pattern enhancement and generation
A technique for trimming or making a position sensor that includes a movable encoder having a track extending along a dimension of the encoder, the track having an optical property that varies with...
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4970379 |
Bar code scanner system and scanner circuitry therefor
In an exemplary wand type bar code scanner the scanner circuit includes a first control loop for reducing the LED driving current as the D.C. voltage level supplied to the digitizer tends to exceed...
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4967676 |
Apparatus for detecting the end of cloth-overlap on a sewing machine
An apparatus for detecting a stepped portion between an upper cloth and a lower cloth on which the upper cloth is mounted, including a light-emitter for transmitting light to a light receiver. The...
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4967066 |
Method and system for increasing the effective dynamic range of a photosensor
In active range finder apparatus wherein an object to be inspected is illuminated by a laser source and light reflected by the object is detected in an imaging photosensor, a system is provided for...
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4965492 |
Lighting control system and module
A micro processor based Lighting Control System and Module is disclosed which controls lighting circuits to operate at reduced power levels to obtain the most efficient lighting level for a given...
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4965444 |
Automatic gain control fiber optica-to-electrical transceiver
A light source is responsive to an input electrical signal to increase or decrease its output depending upon whether the input electrical signal corresponds to a higher light output level than the...
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4958926 |
Closed loop control system for laser
A closed loop control system for a laser which is used in an instrument which may be an optical time domain reflectometer. The system uses the output light of the laser and the light from a fiber...
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4954786 |
Optical amplifying device
A device for amplifying an input optical signal includes an optical amplifier having a gain control region in which the input optical signal is amplified, a first detecting region for detecting the...
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4947030 |
Illuminating optical device
An illuminating optical device including: a light source for emitting a light beam; and an illuminating optical system for receiving the light beam from the light source to irradiate an object with...
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4947047 |
Exposure system with exposure controlling acoustooptic element
An exposure system is disclosed which uses a pulsed laser, such as an excimer, as the light source for exposure. For exposure control, an acoustooptic element is used. More specifically, the...
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4945222 |
Light irradiation control device for use in image recording apparatus
A light irradiation control device for use in an image recording apparatus is disclosed. In one embodiment, the image recording apparatus uses an intermediate sheet on which a mask image is formed...
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4937441 |
Diagnosis apparatus for photo coupler and photo coupler device with diagnosis function
A diagnosis apparatus for a photo coupler having at least one photo coupler including a light emitting element the amount of light emitted from which changes in accordance with the value of a...
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4935615 |
Light intensity control for light beam recorder
A beam recorder comprises a beam generator, a deflector for deflecting the beam to scan the beam, and a light intensity control unit for controlling a light intensity of the beam. The deflection...
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4927266 |
Optical signal generating apparatus and optical power meter calibrating system using the same
In an optical signal generating apparatus of this invention, output light from a light source driven by a light source driver is externally output from an optical receptacle through a variable...
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4926037 |
Apparatus and method to control the precisional position of a light weight motor energized by radiant energy
A motor position controller energized by radiant energy, includes a member that rotates in response to radiant energy. A sensing means is mounted adjacent the absorbing member to sense rotational...
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4922090 |
Device for checking conditions of a strip of wrapping material to a user machine
The device for checking the feed conditions of a strip of wrapping material comprises a photodiode and a phototransistor arranged on opposite sides of the strip. A circuit block including a...
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4922089 |
Constant color temperature and intensity illumination source
A source of illumination of constant color temperature and intensity including a lamp the color temperature of the light from which is dependent on the power applied to the lamp. There is a device...
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4920257 |
Light filter with automatic regulationof optical transmission
The invention relates to improvement in a light filter with automatic regulation of the optical transmission. The filter comprises a filter element (1) with a liquid crystal layer located between...
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4917031 |
Cloth-pattern sensing device for a sewing machine
A device for performing an initial setting of a photosensor of a sewing machine including a light-emitting element and a light-receiving element. The device adjusts the strength of light emitted by...
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4914285 |
Control means for web scanning apparatus
In an apparatus for scanning a transverse region of moving web, the speed of the web being scanning adjusts the clock of the camera that controls the scanning rate of the camera, to maintain a...
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4906842 |
Document counter and endorser with light source control
Apparatus for examining documents moved along a path between a light source normally energized at a first level and a photodetector, in which a first potential proportional to the long term average...
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4904857 |
Electric control system for photoelectric touch input apparatus
An electric control system for a photoelectric touch input apparatus including a plurality of light-emitting elements arranged to produce a plurality of light beams in parallel on a common plane...
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4902884 |
Circuit arrangement for carrying out light intensity measurements
In a circuit arrangement for carrying out light intensity measurements, comprising an input terminal (5), an output terminal (6), a first and a second photodiodes (D 1 , D 2 ) for receiving light...
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4900912 |
Driver circuit for semiconductor light-emitting device
A driver circuit for driving a semiconductor light-emitting device such as a semiconductor laser includes a voltage-controlling amplifier for controlling a light-emitting current which enables the...
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4894524 |
Laser recording apparatus with laser intensity control
A laser recording apparatus for recording a continuous tone image on a photosensitive material by scanning the material with an analog light beam which was intensity-modulated on the basis of an...
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4894525 |
Optical power control device for semiconductor light emitting element
In an optical power control device for a semiconductor light emitting element, a voltage corresponding to a write power set value is modified with write data and then is averaged. The resultant...
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4886961 |
Light detector having light sensor and light indicator, and control circuit thereof
A light detector which indicates decrease in the level of ambient light below a prescribed value. The light detector includes a light indicator for radiating light when the level of ambient light...
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4879459 |
Automatic power controller for semiconductor laser
A controller for controlling the output intensity of a semiconductor laser used in a laser printer or the like in such a manner that the desired adjustment value is obtained, even in the presence...
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4876442 |
Laser control circuit
A laser control circuit is provided in which temperature compensation is achieved by controlling the bias current, thereby preventing intersymbol interference when the temperature of the...
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4862397 |
Remote operation of optical system
A method and apparatus for controlling a detector array based optical system using reflected or transmitted light for machine vision is disclosed. The light characteristic such as power (intensity)...
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4857825 |
Voltage controlled resistor
A resistor has a resistance which is precisely controlled by means of a voltage control circuit. The controlled resistor is a radiation sensitive device which is optically coupled to a source of...
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4855988 |
Optical information recording and reproducing apparatus with amplitude limitation of a detected signal in a write operation mode
The hold mode period of a sample/hold circuit disposed in a control system for controlling a laser diode so as to keep constant luminous power contains the information signal write period, and a...
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4856011 |
Semiconductor laser control circuit
A system for controlling the operation of a semiconductor laser is provided. In one aspect of the present invention, a switching element, which is turned on and off in accordance with a signal...
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4853934 |
Semiconductor laser control apparatus
A semiconductor laser control apparatus comprises a light receiving part for receiving a laser beam emitted from a semiconductor laser, a comparator for comparing an output signal of the light...
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4850712 |
Method and system for determining surface profile information
A system determines the surface profile of an object. Systems of this kind are used in industrial robots, such as automatic welders. The severe operating environment requires a vision system with...
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4845354 |
Process control for laser wire bonding
An optical process monitor primarily for use in laser wire bonding detects the reflectivity change of the wire being bonded in order to provide feedback control of the high power laser used for...
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4845720 |
Semiconductor laser control circuit
Herein disclosed is a semiconductor laser control circuit in which: (i) the peak and bottom values of a pulse light can be controlled independently and precisely and set at an optical power value...
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4837428 |
Driving circuit for laser diode
A laser diode power supply that uses a variable voltage as an input driving signal to provide a programmable laser diode output control instead of a constant reference voltage. The power supply...
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4835545 |
Modulating laser intensity in a laser printer proportionately to the velocity of the photoconductive media
A photosensitive, photoconductive media moving in a first direction relative to a laser light beam scanning in a second direction, transverse to the first direction, incurs velocity variations....
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