43 results about "Stroboscopic effect" patented technology

The present invention relates to an artificial light system for modulating circadian rhythms, increasing vigilance and influencing light-associated psychological conditions such as seasonal affective disorder. The system of the invention comprises a source of a green and/or red light and a source of blue light both light sources being controlled by a computer to provide predetermined light conditions. More specifically, the computer is programmed to provide pulses of blue light and continuous or pulsed red light, to enhance the efficacy of blue light, reduce blue-light hazard and avoid stroboscopic effect.

A sports projectile illuminated with a chemiluminescent light stick capable of producing a stroboscopic effect. The body is made of a soft, pliable material such as NERF® and the light stick(s) is carried through bores in the body. There are no ancillary components, only the light stick(s) and the soft, pliable body. Orifices or various other shapes are cut into the body of the sports projections allowing for the maximum light transmission.

The invention belongs to the field of LED driving control and provides a LED constant current drive circuit and a LED lighting apparatus. The LED constant current circuit is a LED drive circuit having high power factor and no stroboscopic effect. The LED constant current drive circuit includes a constant voltage control module, a feedback control module and a constant current drive module. The feedback control module samples an output voltage of a LED string light, compares the sample voltage with a preset benchmark voltage, and outputs a first control voltage and a constant voltage after performing processing. The constant voltage control module enables the output voltage of the LED string light to be equal to the preset benchmark voltage based on the first control voltage. The constant current drive circuit conducts constant current control on currents passing by the LED string light based on the constant voltage. The LED constant current drive circuit eliminates effects on the LED string light imposed by power frequency of the current of an output end of current regular high power LED drive circuits, and further eliminates stroboscopic phenomenon of LEDs.

The present invention involves methods to combine light and apparatuses to accomplish the same. In some embodiments of the present invention, light from two light sources is combined to achieve multiple functions within one application. In some embodiments of the present invention, light from the light source is filtered using traditional high-contrast filters, transmission filters or the like. In some embodiments of the present invention, novel low contrast filters and variable contrast filters are used. These filters allow passing a light with a narrow frequency band of large intensity, while the broad spectrum light of smaller intensity is still passing through the filter. In some embodiments of the present invention, a strobing effect is used to combine light.

Disclosed are a lighting source detection machine and a lighting source detection method. The lighting source detection machine includes a base, a wide-area dynamic optical detection device, a processing device, a driving conveyor and a sorting device, wherein the wide-area dynamic optical detection device includes a plurality of solar cells, and the driving conveyor includes a feeding arm and a conveying belt. The detection method includes that the feeding arm draws a lighting source of an illustrated LED (light-emitting diode) and transfers the lighting source on the conveying belt, the conveying belt conveys the plurality of lighting sources to be detected to detection positions on the base and supplies power to drive the lighting sources to shine, the solar cells receive optical signals, transfer the optical signal into electric signals, and transmit the electric signals to the processing device to perform Fourier transform, Fourier reverse transform after noise signals are removed, and stroboscopic and stroboscopic effect detections, and finally the processing device drives the sorting device to sort every LED.

A method for avoiding physiological phenomena such as color separation or stroboscopic effects that occur under boundry conditions in the case of intermittent feeding in particular of light-emitting diodes, for additive superposition to form color-locus-variable mixed light, whereby the emission brightness that can be represented by a periodic duty ratio of a pulse-time-modulated constant current feeding—preferably within the respective period—is realized by changeover to other or between different constant current intensities in such a way that a brightness equivalent, namely once again the current-time integral of the predetermined, brightness-determining duty ratio, arises in the current area sum, which now preferably no longer exhibits gaps over the period.

The invention belongs to the technical field of illumination of an organic light emitting diode, and discloses an alternating current driven white light OLED device. The white light OLED device comprises a first light emitting unit, a second light emitting unit and an electrode connecting layer positioned between the two light emitting units; the first light emitting unit and the second light emitting unit both give out white light; when the device is in use, the electrode connecting layer is connected with one end of an alternating current power supply; the first light emitting unit and the second light emitting unit are connected with the other end of the alternating current power supply separately to form two groups of parallel light emitting circuits; the first light emitting unit is driven in the positive period of an alternating current signal while the second light emitting unit is driven in the negative period of the alternating current signal to realize the alternating currentdriven white light OLED device, and a non-stroboscopic effect can be achieved; relatively stable white light can be obtained without depending relative sizes and frequency of positive and negative voltage signals; and in addition, by adoption of an inorganic light emitting material, the white light OLED device can be more diversified.

The invention discloses a color structure light projection device, and belongs to the field of projection display. The projection device comprises a first single-color light source, a second single-color light source and a third single-color light source, wherein the first single-color light source is subjected to light homogenization by a first light homogenization sheet and forms uniform illumination distribution on a first grating; the second single-color light source is subjected to light homogenization by a second light homogenization sheet and forms uniform illumination distribution on asecond grating; the third single-color light source is subjected to light homogenization by a third light homogenization sheet and forms uniform illumination distribution on a third grating; the first grating, the second grating and the third grating are located on three side surfaces of a light combination prism, and are mechanical transmission gratings; distances of the gratings and the corresponding side surfaces of the light combination prism are equal; and a projection lens simultaneously projects images of the first grating, the second grating and the third grating to a to-be-measured three-dimensional object. Relative positions of the mechanical transmission gratings adopted by the projection device are adjustable; a stroboscopic effect can be completely eliminated; and the single-color light sources can adopt different color combination to form different color structure light. Therefore, the color structure light projection device is wide in application demand.

A laser projection apparatus and method for identifying specified coordinates on varied surfaces. A controller directs two or more laser projectors to intersect laser lines at a specified location. The locations of the modules are identified by calculating a rotational angle and two or more known coordinates. Once the location of the modules is calculated, angle to angle intersection is used to identify additional locations. The user indicates with the controller which location is to be identified. The controller processes the calculations and commands the laser projectors to draw the intersecting laser lines at the specified location. The intersecting laser lines are actuated in a strobe effect to attract the user's attention to the position. This apparatus and method allows users to quickly and easily locate specified locations without needing to take individual measurements for the purposes of alignment, construction, verification and the like.

The invention discloses a device of a multiplexed output lightening electric light source. An AC power supply is respectively communicated with the active filter circuit and a pulse delay phase-shift circuit through an active filter circuit, a high frequency rectification filter circuit CF, and a high frequency switching mode power supply control circuit in sequence. The high frequency switching mode power supply control circuit adjusts the oscillation frequency according to different electric light source loads, generates two way interlocked positive pulse outputs which are delayed and phase-shifted by the pulse delay phase-shift circuit, and realizes the multiplexed output high frequency voltage and current as well as the multiplexed output lightening electric light source. The invention has the beneficial effects that the strobe and the stroboscopic effect of the electric light source are effectively eliminated, the illuminating quality is improved obviously, and the input current harmonic component is reduced, thereby causing the electric light source to obtain higher photoelectric transformation efficiency on the premise that the lower power is used, and achieving the purpose of saving the electric energy.

The invention discloses a drive circuit of an LED light source, a control circuit thereof and a control method thereof which are used for supplying energy to a light emitting diode (LED). The drive circuit comprises a rectifier, a filtering capacitor and a control circuit. The rectifier is used for converting alternating current voltage outputted by an alternating current power supply into rectified alternating current voltage. The filtering capacitor is coupled with the rectifier and is used for filtering the rectified alternating current voltage so as to provide direct current voltage. The control circuit is used for controlling energy supply of the LED light source. When a switch which is coupled between the alternating current power supply and the rectifier is disconnected, the control circuit enables discharge current periodically and discharges the filtering capacitor, and when the control circuit determines that the switch is in conduction, the control circuit forbids the discharge current. Through employing the drive circuit and the control method of the LED light source with a discharge circuit, when an illumination switch is disconnected, the filtering capacitor is discharged through the discharge circuit, and a stroboscopic effect of the LED source is effectively avoided.

The present invention finally obtains control circuit for vibration stop by connecting positive and negative peak value sampling circuit connected with electronic rectifier to positive-negative peak value voltage signal addition circuit and connecting the signal addition circuit with obsolute value comparator. The voltage division of AC voltage drop in energy saving lamp is carried out by the control circuit to obtain positive phase peak value and negative phase peak value of lamp tube voltage separately. Whether vibration stop is carried on or not is decided by the control circuit after the positive-negative peak value voltage signals is added and compared.

The invention belongs to the technical field of lighting and specifically relates to a replaceable LED (light-emitting diode) energy-saving lamp adopting an LED as a power supply. The replaceable LED energy-saving lamp comprises a metal long support pipe, connecting plugs arranged at two ends of the metal long support pipe, a strip-shaped metal light band plate and a plurality of LED light sources arranged on the light band plate, wherein the light band plate is arranged at the lower part of the long support pipe and is in contact with the lower end surface of the long support pipe, and electrodes of the connecting plugs are electrically connected with the LED light sources through conducting wires. The replaceable LED energy-saving lamp is reasonable in structure and good in heat radiation performance, and has the advantages of energy conservation, environment friendliness, safety, long service life, elimination of stroboscopic effect, maintenance-free property and the like; and furthermore, the replaceable LED energy-saving lamp can be directly used for replacing an existing fluorescent tube under the condition of not changing a support of a fluorescent lamp in all places using inductive fluorescent lamps, thereby greatly saving financial and material resources.

The invention provides an LED stroboflash-free control circuit. A current mirror composed of M1 and M2 realizes current mirror image. A piezoelectric tube M3 improves a grid control voltage of the current mirror and reduces the mirror image proportion of the current mirror. A current-limiting resistor limits a current on an On circuit. An anti-current-backflow diode D1 prevents the current from flowing backwards into the current mirror. A charging capacitor C1 is used for storing a voltage, and a follow current loop D2 continuously provides a current for an LED lamp. The current mirrored by the current mirror and the current generated by the follow current loop ensure that the controllable gauge dimmer maintains the On state of the circuit, thereby reducing the flicker index. Meanwhile, the circuit also can guarantee that the input current and the input voltage have the same phase, and guarantees that a high power factor exists. The circuit has the advantages of simple circuit structure, obvious stroboscopic effect removal, small chip area, low cost and high power factor.

An image capturing system introduces or controls an aliasing/stroboscopic effect in a cyclically moving object. The system has a camera to capture a series of images to form a video of the cyclically moving object. A sensor detects the cycling frequency of the cyclically moving object and generates a frequency reading with a control module communicably coupled to the sensor. Retro-reflective indicia are provided on the cyclically moving object. A light emitter is aligned with the camera and is operable to emit pulses of light at a controllable emission frequency, such that pulses of light which reach the retro-reflective indicia are reflected backwards towards the camera, wherein the control module is configured to control the emission frequency of the light emitter based on the frequency reading, thereby to influence the temporal aliasing of the retro-reflective indicia provided on the cyclically moving object.

The invention discloses an integral LED fluorescent lamp circuit which comprises a PCB. The PCB is provided with an input transformer circuit, a half-bridge circuit, a filter circuit, a transformer and a constant voltage control circuit, wherein the half-bridge circuit and the filter circuit are connected with an input joint and the transformer, and the constant voltage control circuit is used for stabilizing the working electricity; and an AC voltage of 220V is converted into a DC voltage of 3.5V to be output by the half-bridge circuit, the filter circuit, the transformer, a screened circuit and the constant voltage control circuit which are all arranged on the same PCB so as to satisfy the symmetrical stability of LED lamps, such as currents, voltages, luminous flux, a flux factor, and the like, be normally used in a wide AC voltage ranging from 80V to 250V and turn to be a high-quality environment-friendly light source with high illumination, environmental protection, energy saving, long service life, small light decay and no stroboscopic effect. The invention has the advantages of attractive integral structure and reliable performance, thereby being an ideal product for replacing traditional fluorescent lamps.

The invention provides a high-power-factor low-ripple single-stage correcting circuit which comprises a rectifier circuit, a free-wheeling circuit, an energy storage circuit, a switching circuit and a transformer, wherein the free-wheeling circuit is connected between the rectifier circuit and the energy storage circuit; the free-wheeling circuit and the transformer share the switching circuit; the energy storage circuit adopts a series-charging and parallel-discharging structure. The input power factor of the circuit is increased, the output ripple current is reduced effectively, and less components are used, so that the light stroboscopic effect is reduced, the circuit structure is simplified, and the product cost is reduced.

The invention discloses a light quality detector and a stroboscopic detection method therefor. The detector comprises a photoelectric sensor, an analog circuit, a power circuit, a display circuit, a main control circuit and a housing. The photoelectric sensor, the analog circuit, the power circuit, the display circuit and the main control circuit are fixedly disposed inside the housing. One end ofthe photoelectric sensor is electrically connected with one end of the analog circuit, the other end of the analog circuit is electrically connected with one end of the main control circuit, and theother end of the main control circuit is electrically connected with one end of the display circuit. The photoelectric sensor is used for collecting photoelectric signals. The detector can detect thespecific values of illuminance, power frequency stroboscopic effect, power frequency stroboscopic percentage, high frequency stroboscopic effect, and high frequency stroboscopic percentage at the sametime. Meanwhile, the detector also can give different prompts according to the detected data, and is suitable for the detection of the quality factors of different lamps, in particular for the detection of a fluorescent lamp.

The invention discloses an LED light source image detection method and device with a stroboscopic suppression function, and the method comprises the steps: S1, determining the optimal exposure time for a target image sensor, so as to enable the target image sensor not to have an LED stroboscopic effect when the target image sensor collects an image of a to-be-detected LED light source according tothe optimal exposure time; s2, reducing and adjusting the light incoming amount of the target image sensor according to the determined optimal exposure time so as to reduce the light incoming amountof the target image sensor until overexposure does not occur, and determining the adjusted light incoming amount; and S3, controlling a target image sensor to acquire an image of the LED light sourceto be detected for detection according to the optimal exposure time determined in the step S1 and the light incoming amount adjusted in the step S2. The LED stroboscopic effect can be suppressed whenthe LED light source is detected, and meanwhile, the overexposure phenomenon is avoided.

The invention relates to a method for producing image information of an image in an image sequence using the image information of a first image. The object of providing a method for producing image information of an image in an image sequence so that a stroboscopic effect is avoided even during different motion speeds of the image information, but still enabling clear depiction at low image information speed, is achieved in that the number of intermediate images is determined as a function of the first motion parameter and a weighting factor is calculated for each intermediate image.