194 results about "Constant light" patented technology

A lighting system is provided whereby long operating life can be reasonably ensured by taking into account requirements of the application, characteristics of the LEDs, characteristics of the fixture containing said LEDs, the desired number of operating hours, and—via developed relationships—taking an iterative approach to supplying power to the LEDs. Through the envisioned compensation methodology and effective luminaire design, a relatively constant light level can be assured for a predetermined number of operating hours (possibly longer); this is true even if operating conditions change, known behavior of LEDs proves untrue over untested period of time, or some other condition occurs which would otherwise cause end-of-life prematurely and prevent the system from meeting the desired number of operating hours.

A light wand includes light emitting diodes that transmit monochromatic light for a therapeutic response. The monochromatic light provides healing and relieves pain from such conditions as, for example, abrasions, cuts, wounds, acne, and other skin conditions. Pulsed light and/or a constant light stream are emitted from the wand under the user's control. Intensity of the light energy is also controlled by the user through a control pad on the light wand. The light wand is portable and dimensioned for consumer use.

Process and apparatus for the formation of patterns in a photosensitive resin layer or photoresist by continuous laser irradiation, application to the production of microtip emissive cathode electron sources and flat display screens. Formation takes place of non-mutually interfering elementary light beams (41), there is at least one relative translation at constant light power and speed of said beams with respect to the layer in order to irradiate lines thereof, each line receiving a light dose lower than that necessary for the development of the resin, a relative rotation of all the beams with respect to the layer takes place, the translation is recommenced in order to irradiate other lines, each line receiving a light dose complimentary to the preceding dose and the resin is developed.

A method and apparatus for non-invasively determining the blood oxygen saturation level within a subject's tissue is provided that utilizes a near infrared spectrophotometric (NIRS) sensor capable of transmitting a light signal into the tissue of a subject and sensing the light signal once it has passed through the tissue via transmittance or reflectance. The method includes the step of determining attenuation of the light signal as the sum of: (i) attenuation attributable to deoxyhemoglobin; (ii) attenuation attributable to oxyhemoglobin; and (iii) attenuation attributable to light scattering within the subject's tissue. The present method also makes it possible to account for attenuation attributable to fixed or constant light absorbing biological tissue components, and attenuation attributable to variable characteristics of the sensor. By determining differential attenuation as a function of wavelength, the attenuation attributable to tissue light scattering characteristics, fixed light absorbing components, and measuring apparatus characteristics are mathematically cancelled out or minimized relative to the attenuation attributable to deoxyhemoglobin, and attenuation attributable to oxyhemoglobin.

System and method are provided for controlling emergency lighting where emergency lights turn on when main source of power goes out for controlling emergency lighting to conserve energy utilized by the emergency light, while maintaining good visibility of the emergency lighting. Solid state lighting, such as LED, is used within an emergency light to add light in blue wavelength region matching the light output to the most sensitive of wavelength response of the human eve to increase color perception and allows faster response time. Electrical current to the device and light output are reduced while LED light tends to increase its blue wavelength component as it is dimmed thus increasing effective light output. After a predetermined time, the light is purposefully dimmed to conserve energy and to allow the eye to slowly and safely adjust to the new lighting conditions. By reducing electrical current, energy storage batteries may be smaller than for similar unit that maintains constant light output.

The invention relates to an embedded type door control work attendance checking machine with the function of face recognition, which belongs to the technical field of biological characteristic recognition. The door control work attendance checking machine adopts the technical scheme that an embedded type host DSP is used, and the machine comprises a CMOS infrared photography module used for capturing facial images, an infrared Led Module used as a constant light source, a Wiegand interface and a USB interface; besides, infrared light filters with narrow bands are arranged on the camera shot of the CMOS infrared photography module, and the band width of the infrared light filters with narrow bands only allows near infrared light emitted by the infrared Led Module to pass through and shields visible light and other kinds of infrared light in the sunlight; the DSP presents the simulated generation of door control Wiegand signals by an IO interface and is used as a standard output control means for door control. The machine adopts the infrared light filters with narrow bands and the infrared Led Module to thoroughly solve the problem of visible light influence, which troubles face recognition for a long time, and the machine has the advantages of unique convenience, untouchable performance and stability and can be widely applied to the field of door control work attendance check.

The invention discloses an LED surgical shadowless lamp system with a full-automatic intelligent constant-light control function. The LED surgical shadowless lamp system has the advantages that video images of illuminated regions can be acquired by the aid of a CMOS (complementary metal-oxide semiconductor) camera of the system and then are subjected to noise reduction and enhancement processing by the aid of an image preprocessing module, processed data are transmitted into a video frame image storage unit to be stored in the video frame image storage unit, then the video images are blurred, brightness information of illumination regions and color information of illuminated objects are acquired by the aid of an image processing algorithm, shielding objects in the images are divided and processed in real time, and shadow regions formed by the shielding objects are acquired; an intelligent controller calculates driving current values of required-to-be-adjusted LED light sources via a fuzzy neural network according to the acquired information after processing procedures are completed, the information is further transmitted to an LED constant-current driver, the brightness and the color temperatures of corresponding LEDs can be regulated, accordingly, shadow can be eliminated, and the illumination regions are uniform and constant in illumination.

The invention discloses an intelligent dimming controller in an LED shadowless lamp lighting system. A blurred visual image processing technology is adopted to conduct feature analysis and processing on images in a surgical view field, brightness information and chrominance information of a lighting environment are extracted, and current control parameters of LED light sources are calculated through an intelligent processing algorithm. Specifically, the images in the surgical view field are converted into digital image signals firstly, the signals are read into the system through a video image collecting module, then the signals are analyzed through an image analysis and processing module, illuminance distribution information and chrominance distribution information are extracted, corresponding illuminance feature vectors and corresponding chrominance feature vectors are extracted through an illuminance and chrominance feature extraction module, a shadow area generated by a shielding object is split through a blurred image dividing module, the driving current value of the corresponding LED light source is worked out through a blurred neural network, the driving current value is sent to an LED controller to adjust the brightness of a corresponding LED. Thus, the purposes of shadow eliminating, illuminance evening and constant-light control are achieved, automatic dimming control is realized, no manual intervention is needed, and shadows are completely eliminated.

The present invention provides a disc player comprising one or more light sources that project a constant or pulsing light onto the upper portion of a disc being played by the disc player. If a constant light source is used, the a pulsing viewing port for the disc receptacle of the disc player is employed. The pulse frequency, pulse length, pulse period, pulse interval, pulse color, pulse intensity or a combination thereof of the light source or the pulse frequency, pulse length, pulse period, pulse interval, or light transmissivity of the one or more viewing ports can be synchronized with the rotation of the spindle or platen in the disc player, with the optical data stored, or with the rotation of an image precursor on the disc. When the disc is viewed through a viewing port while the disc is being played, a two-dimensional or three-dimensional discrete image is formed by the persistence of vision. The disc player can also include an anti-piracy system to prevent unauthorized playing of digital/optical disc content. The anti-piracy system includes a verification system and access control data. When permission granting information is obtained from the disc, the verification system compares it to the access control data and either allows or disallows the disc player to play the disc.

The invention provides a fluorescent mark immunity test strip detector, belonging to the technical field of fluorescent mark immunity sample test strip detection. The structure comprises an optical system, a testing jig (1), a shell (8), a data collecting system and a control system; wherein the optical system comprises an excitation light source (3), a light filter (4) and a dim light CCD sensor (6); the data collecting system consists of a dim light CCD sensor data collecting circuit and a PC; the control system comprises a light reverse feed back constant light intensity automatic control circuit. Two excitation light source modes are provided in the invention, the excitation of 2-4 types of wave length can be switched, the structure is simple and reasonable, the operation is convenient and the different test requirements can be satisfied; the detailed distribution condition of the two fluorescent mark lines of a testing zone and a quality control zone on the test strip can be attained in one step; the image brightness of the CCD fluorescent mark line can be enhanced; the testing sensitivity can be improved; and the testing period of the test strip is shorter than 1min.

A balloon illuminator that can emit either a flashing or constant light depending on the polarity of the battery used to power the device. The device can be modified to cycle through a series of colors. The balloon illuminator is comprised of a lens, light emitting diode, a battery, and means to switch the balloon illuminator from flashing to constant light mode depending on the polarity of the battery and a housing lined with electricity conducting material. Once fully assembled, with each component contained in the housing, the electrical circuit formed by housing and components is closed and the balloon illuminator emits light. The balloon illuminator also works without a lens, though in the preferred embodiment, the lens is used to disperse the light more fully in the interior of the balloon. A balloon illuminator that uses a multi color light emitting diode can cycle through a series of colors once the illuminator is fully assembled and the electrical circuit completed. The balloon illuminator is impervious to liquid and is compatible with liquid sealants used to coat the inner lining of latex balloons to prevent leakage of gas.

The invention discloses a stereoscopic display which comprises a display panel, a controller for glasses, an image controller and a backlight controller, wherein the display panel is divided into N blocks; the controller for the glasses is used to control open and close of a left glass and a right glass; the image controller is used to generate an image data enable signal; the backlight controller is used to control open and close of each block backlight; the display panel receives a left eye image signal, a right eye image signal, a left eye backlight signal and a right eye backlight signal and displays a left eye picture or a right eye picture based on these signals. In the invention, a region type backlight is adopted, the synchronization of backlight and liquid crystal display scanning is utilized and the problem of left and right images interference (Corsstalk) of the stereoscopic display is solved without increasing circuit cost; as the backlight of the display disclosed by the invention can be lightened when opening the glasses (the left glass or right glass), therefore, the service efficiency of the backlight is higher than that of the traditional on-and-off glass type stereoscopic display with a constant light of backlight and the power consumption can be saved.

Disclosed are an infrared filter for face recognition and a manufacturing method thereof, which belong to the biometrics identification field. The infrared filter manufactured by adopting the method of coating infrared-transmitting glass which has the important characteristics of narrow band and high cut-off height. The specific manufacturing method includes forming a narrow-band peak by coating a filter membrane on the infrared-transmitting glass, realizing central wave length Gamma0, peak transmittance T0 and half bandwidth B, realizing visible light cut-off S through the thickness and the material of the infrared-transmitting glass, coating a band-pass cut-off filter membrane on the float glass to realize the infrared cut-off depth S, and gluing a colored glass coated with a narrow-band filter membrane and the float glass coated with the band-pass cut-off filter membrane by the photoresist. The narrow-band high cut-off depth infrared-transmitting filter manufactured by the method can be engaged with an infrared emitting diode group to form an invisible constant light source, thereby resolving the light problem besetting the face recognition performance for a long time.

The invention discloses imitated artificial haze monitoring system and method. The imitated artificial haze monitoring system comprises a breathable and light-tight front-end box body and a background computer, wherein a target object, a constant light source, image collection equipment and a data transmission unit are arranged inside the front-end box body; the target object is a red and black checkerboard array picture; the constant light source is arranged at the top of the inner side of the front-end box body; the image collection equipment and the target object are oppositely arranged; the image collection equipment transmit data to the background computer through the data transmission unit; the background computer is used for computing the color characteristic, the shape characteristic and the texture characteristic of the target image, obtains the change rate of each characteristic relative to the corresponding characteristic of the target image in absence of haze, obtains haze indexes according to each characteristic change rate, and obtains haze concentration through a mapping function according to the haze indexes. Haze monitoring is achieved from a new angle, the imitated artificial haze monitoring system is low in cost, and easy to deploy, and overall haze monitoring of an overall area can be achieved. Thus, abundant information is provided for air pollution prevention and treatment.

A testing method utilizes light feedback and automatic control technique to modify camera used flash light or similar ones to be impulse xenon lamp with constant light strength in addition to conventional program-controlled electron load, testing circuit and computer. The light impulse with several milliseconds of constant light strength can be obtained at each flash of the light source and I-V curve data collection of solar energy battery can be finished by computer-controlled testing circuit within the period of single flash and to finalize test of solar battery electric parameter in several seconds. The method also can be used to test solar battery component as well as can be utilized to manufacture the testing device for both of one-body solar battery and solar battery component.

The invention discloses a constant light control system with intelligent lighting. The system comprises a light signal module, a photoelectric sensor, an illumination intensity detection module, a driving control module, a light source module, an LCD display screen, an intelligent control module and a keyboard input module. A modern fuzzy technology and a digital signal processing technology are adopted so that illumination intensity of a lighting environment is self-adaptively adjusted to a certain set illumination intensity value. A generalized interface is adopted so that self-adaption to various types of light sensors is enhanced. The driving control module is changed so that the system is applicable to control of various light sources, and thus generality is high. A fuzzy intelligent control algorithm is adopted so that adjustment accuracy is enhanced, adjustment can be performed continuously and smoothly in an adjusting range, and adjusting step is small without flashing or jumping. An intelligent interaction interface is adopted so that the required illumination intensity can be manually set, and change of illumination intensity of the environment can be tracked and monitored in real time via the display screen. The constant light control system is simple in structure, low in power consumption, small in volume and high in reliability.

The inside surface of a cover for a skylight is molded to have a variable prism that directs low-angle light into the skylight tube and that reflects away some high-angle light, to achieve a more constant light output over the course of the day. The prism is established by a series of circular parallel grooves, with grooves nearer the apex of the cover having cross-sections that are different than the cross-sections of grooves nearer the periphery of the cover.

A backlight system and an LCD using the same are provided. The present backlight system is equipped with a light-source driving module and several light sources of different optimum working temperature ranges. Hence, according to the environmental temperature, appropriate light source(s) will be driven by the light-source driving module to maintain a constant light output of the backlight system.

The invention discloses a constant-light control system based on a fuzzy algorithm. The system comprises a photoelectric conversion signal module, an A/D conversion module, a digital filter module, a control signal output module, a light source module and an intelligent control module. According to the constant-light control system, a modern fuzzy technique and a digital signal processing technique are adopted, and illuminance of lighting environment is adjusted to a certain set illuminance value in a self-adaptation mode; a filter algorithm for collecting an illumination signal is used, wrong output caused by external disturbance cannot occur, and anti-disturbance performance is improved; a fuzzy intelligent PID adjustment algorithm is adopted, adjustment precision is improved, continuous and smooth adjustment can be carried out in an adjustment range, the adjustment step pitch is small, flicker and jumping do not exist, and high adjustment quality is achieved; the constant-light control system is in a single-piece design, all functional modules are integrated in a chip, the constant-light control system has the advantages of being simple in structure, low in cost and power consumption, small in size and high in reliability and luminous efficacy of a light source and the energy-saving effect can reach the best state.