50results about How to "Eliminate speckle" patented technology

Provided are an illumination system capable of eliminating laser speckle and a projection system employing the illumination system. The illumination system includes a laser light source having at least one laser, and a first diffractive optical element to divide a laser beam emitted from the laser light source into a plurality of partial beams and to time-average the partial beams through a periodical movement to eliminate speckle. Accordingly, the illumination system can eliminate speckle of the beams emitted from the laser light source and the projection system employing the illumination system can achieve a high quality image.

A method for the elimination of image speckles in a scanning laser projection is suggested, in which a phase hologram is used for dividing the illumination beam of the projector into partial beams. The partial beams are heterodyned again on the image screen within the image element (pixels) to be projected in such a way that differing speckle patterns are formed which average each other out in the eye of the viewer over time and/or space. Thus, a device is provided especially for the laser projection which substantially eliminates or reduces the speckles at the viewer. However, the beam form and the beam density are hardly or not changed.

The invention discloses a laser projection light source for achieving uniform no-speckle illumination, and the light source comprises a laser for generating laser light; a scattering sheet which enables a light beam to be scattered, enlarges a divergence angle of the light beam, enlarges the area of the light source, and reduces the coherence of a light field; an optical integration rod which enables the light beam to be reflected many times in the optical integration rod, improves the distribution uniformity of the light field, and reduces the coherence of the light field; a reflection bowl which is used for collecting the emergent light of the optical integration rod, reduces the divergence angle of the light beam, and enables light to be emitted outwards in parallel as much as possible; a double-row fly-eye lens array which collects the light of the reflection bowl, reduces the divergence angle of the light, and improves the distribution uniformity and parallelism of the light field; and a field lens which gathers light, reduces the divergence angle, and improves the uniformity.

The invention discloses a non-iteration complex amplitude modulation holographic projection method which includes the steps of decomposing light vector of each pixel of a complex amplitude light field into two pure phase values to obtain two pure phase holograms with equal size of an original image, sampling and synthesizing the two pure phase holograms through chequer patterns, adding inclination plane wave factors on the synthesized pure phase hologram to obtain an encoded pure phase hologram, sequentially arranging a phase spatial light modulator, a light splitting prism, a first lens, a filtering diaphragm, a second lens and a screen, transmitting the encoded pure phase hologram to the phase spatial light modulator through a computer, and observing the complex amplitude light field on an output side screen through a 4f optical path system. Through the method, reconstruction image speckles can be eliminated, influence of device zero-order wave on a reconstructed image can be prevented, and the calculating speed of a hologram is increased.

The invention discloses a laser rotation scanning lighting device. The laser rotation scanning lighting device comprises a rotating device used for driving a reflecting mirror to rotate along the normal line of the reflecting mirror, the reflecting mirror and a laser light source. The emergent laser light of the laser light source is reflected by the reflecting mirror, and the reflected laser light is used as a scanning lighting source. The invention further discloses a method using the laser rotation scanning lighting device for lighting. The laser light source can be scanned by rotating the reflecting mirror, a plurality of light spots can be overlapped rapidly on a final irradiation plane, the average effect is achieved visually, and the purpose for eliminating speckles and stripes can be achieved. The laser rotation scanning lighting device is simple in structure, low in cost, high in energy utilization rate, and particularly suitable for the application field of laser night vision, security and protection, laser projection and the like in which optical fiber output laser light is used as the light source.

The invention discloses a speckle restraining device for a laser light source based on an MEMS (micro-electromechanical systems) technology, relating to the technical field of laser display. The speckle restraining device can be used for solving the problems of poor speckle elimination effect, complex realization structure, high possibility of damaging, high cost and the like of the existing speckle elimination method. The speckle restrain device comprises a planar optical waveguide shunt and a converging lens, wherein the planar optical waveguide shunt is obtained by processing on a glass substrate by the MEMS processing technique; the converging lens is arranged on the output waveguide side of the planar optical waveguide shunt and is used for gathering light beams output by the planar optical waveguide shunt; the planar optical waveguide shunt is of a 1*N structure, wherein N is more than or equal to 2; and each output waveguide of the planar optical waveguide shunt is respectively integrated with a phase modulation device. The speckle restraining device has the advantages of simple structure, mature processing technique, low construction cost, high integration level, good speckle elimination effect and stable performance, and is easy to implement.

The invention relates to the technical field of displaying by taking coherent light as a light source, and in particular relates to a speckle elimination device based on Mie scattering and Brownian motion, aiming at solving the problems of poor speckle elimination effect, complex implementation structure, high possibility of damage, high cost and the like existing in the existing speckle elimination method. The speckle elimination device based on Mie scattering and Brownian motion comprises a sealed optical reflecting cavity provided with an incident light coupling device and a transmission and emergence surface; all the inner walls of the sealed optical reflecting cavity, except the inner walls of the transmission and emergence surface, are mirror surface inner walls; the sealed optical reflecting cavity is fully filled with a solution or a sol; and insulating particles which are in proper dimension to lead to the Mie scattering of incident laser are scattered in the solution or sol. The speckle elimination device based on Mie scattering and Brownian motion has the advantages of simple and compact structure, low manufacturing cost, good speckle elimination effect, high laser utilization ratio, stable performance and light uniformizing function, is easy to implement and is safe and reliable.

The invention provides a laser projector which comprises a shell, a laser source arranged in the shell and a vibration module for driving the laser source to vibrate with specific amplitude. In the invention, speckles can be eliminated by means of vibration of the laser source in the projector, and the projected image quality of the projector is ensured.

The invention provides an optical mixing rod vibration structure for laser illumination speckle reduction, and belongs to the technical field of laser illumination. The optical mixing rod vibration structure comprises a coupling lens, an optical mixing rod, a vibration mechanism and a control circuit; laser emitted by an optical source is gathered via the coupling lens, is outputted into an incident surface of the optical mixing rod and is outputted via an emergent surface of the optical mixing rod; the optical mixing rod is fixed into the vibration mechanism and vibrates vertically in a constant amplitude manner. The axis of the optical mixing rod is coincided with the optical axis of the laser outputted by the coupling lens when the optical mixing rod is in a non-vibration state. The control circuit controls the amplitude and the frequency of vibration of the vibration mechanism. The optical mixing rod vibration structure has the advantages that an extra shaping lens which is an optical device is omitted, efficient shaped illumination is implemented, and the size of a system is reduced; the energy efficiency and a polarization characteristic of the laser are maintained while speckles are reduced.; the shape of a speckle-free illumination spot is matched with that of a projection chip, and the energy utilization efficiency of illumination beams is improved.

The present invention discloses a watt level laser fiber beam combining device based on multimode fibers. The watt level laser fiber beam combining device comprises a laser generation module, a fiber beam combining module and a vibration motor. The output end of the laser generation module is connected with the input end of the fiber beam combining module, and the output end of the fiber beam combining module is wound on the vibration motor. The laser generation module emits multiple beams of watt level visible laser and enables the multiple beams of watt level visible laser to be coupled in the fibers, the multiple beams of watt level visible laser are combined into a beam of composite laser via the fiber beam combining module, and the vibration motor vibrates and drives the output end of the fiber beam combining module to vibrate to thereby eliminate the speckles in the composite laser. The watt level laser fiber beam combining device has lower parts precision requirements, can eliminate the speckles in the composite laser in a more economic manner, and can output the high-quality flat-topped light beams.

The invention discloses a method for expanding holographic retinal imaging of an angle of view, comprising the steps of: 1) calculating a hologram of an object; 2) determining parameters in the optical system, such as a spacing between several point sources, sampling pitch and resolution of a spatial light modulator, focal length of a lens, and position of a filter; 3) laying out a projection device: sequentially arranging a light source group composed of several point light sources, the spatial light modulator, the lens and the filter, wherein the spatial light modulator is connected with a computer; and 4) transmitting the phase hologram to the spatial light modulator through the computer, and then using the spatial light modulator to project the phase hologram into the observer's eyes at a specified position. The holographic retinal imaging method is capable of effectively expanding the field of view of the reconstructed image on the basis of ensuring the quality of the reconstructed image.

The invention discloses a speckle elimination device based on Mie scattering and an optical device, relating to the technical field of display by taking coherent light as a light source; and the device provided by the invention can be used for solving the problems of poor speckle elimination effect, complex realization structure, high possibility of damaging, high cost and the like of the existing speckle elimination method. The speckle elimination device comprises an optical reflection cavity and the optical device, wherein the optical reflection cavity is provided with an incident light coupling device and a transmission outgoing surface; the optical device is over against the incident light coupling device of the optical reflection cavity and can change the incident angle of a light beam when the light beam enters the incident light coupling device of the optical reflection cavity; the inner walls, expect the inner wall of the transmission outgoing surface, of the optical reflection cavity are all 'mirror surface' inner walls; the optical reflection cavity is filled with a transparent solid matter; and medium particles the linearity of which can cause incident laser to be subjected to Mie scattering are scattered in the transparent solid matter. The speckle elimination device has the advantages of simple and compact structure, good speckle elimination effect, high laser utilization ratio, stable performance, safety, reliability and light homogenizing ability.

Provided is a novel side-light type backlight source device applying a wavelength conversion principle. The device comprises a backlight source and a reflection layer, the backlight source comprises an excitation light source, a wavelength conversion layer and a filter layer which are sequentially arranged in the direction of an optical axis at intervals, and the excitation light source adopts a UV laser light or a short-wavelength blue laser light; the wavelength conversion layer is used for converting the UV laser light or the short-wavelength blue light into a red light, a green light and ablue light for emergence; the filer layer is used for reflecting the UV laser light or the light of a short-wavelength blue light wave band and transmitting the light of a visible light band at the same time; the excitation light source is taken as the side-light type backlight source and arranged at one end of a light guide plate, the reflection layer is arranged on the back surface of the lightguide plate, and a diffusion layer is arranged on the front surface of the light guide plate. The novel side-light type backlight source device has the advantages that in the wavelength conversion type light source where laser is used as an excitation source, the risk which is caused when the laser directly irradiates into the human body is effectively avoided, the damage to human eyes by the near ultraviolet and short-wavelength blue light is avoided, and the problem of light speckle of a display picture caused by the laser light source is solved. The novel side-light type backlight source device takes both safety and display performance into consideration.

The invention discloses a laser speckle inhibition method, and relates to the technical field of laser display. The method comprises that multiple laser units are arranged in an array form with the same light output direction to form an array laser source; multiple laser units are selected from the array laser source as a first laser unit group, and other laser units form a second laser unit group; the first laser unit group is changed from the first brightness to the second brightness and then to the first brightness; and when the first laser unit group reaches the second brightness, the second laser unit group is changed from the first brightness to the second brightness and then to the first brightness. According to the method, multiple separate laser units emit light alternatively, the difference of the amplitude of adjacent laser units is large, the contrast of speckles gradually reduces, and the speckles are eliminated finally.

The invention discloses a wedge mirror laser speckle eliminating device, a laser light source and a laser display system. The speckle eliminating device comprises an optical deflector and a uniform light stick which are orderly arranged along an optical path. The optical deflector includes the combination of at least one group of rotating mechanisms and a wedge lens. The wedge lens is periodically rotated around an initial space spread direction of a laser beam under the driving of a rotation mechanism and carries out periodic deflection on the space spread direction of the laser beam. The rotation period of the periodic rotation is far smaller than an eye integration time. The uniform light stick collects a periodically deflected laser beam and outputs an imaging light beam. The device can effectively eliminate laser speckle.

The embodiment of the invention provides a speckle eliminating device, a laser light source and projection equipment, the speckle eliminating device comprises at least one prism group, each prism group comprises a plurality of sub-prisms which are arranged in parallel, the plurality of sub-prisms can disperse a beam of incident laser into a plurality of beams of emergent laser, and the plurality of sub-prisms are arranged in parallel. And the optical path difference of the multiple beams of emergent laser is greater than the coherence length of the laser, that is, one beam of laser is divided into multiple beams of laser, the optical paths or optical paths of the multiple beams of laser are different, and when the optical path difference of the different paths of the multiple beams of laser is greater than the coherence length of the laser, the lasers of different paths cannot be coherent, so that the coherence of the laser is weakened, and the coherence of the laser is reduced. The laser speckles in the image are eliminated, and the imaging display effect is effectively improved.

A system for printing a laser light source comprises a print head module and an ink box. The print head module is used for printing each laser light source on a substrate with ink. The ink box is usedfor storing the ink. The ink comprises a luminescent dye, a matrix material and a solvent. The technical solution disclosed by the invention firstly makes the laser light sources by inkjet printing,which provides a new technical solution for inexpensive and industrial manufacture of various laser light sources and other related products; secondly, since the laser light sources are convenient toachieve a module including multiple groups of independent laser light sources, each group of laser light source modules is enabled to be independent from each other when they emit light, and laser coherence between the emitted light is avoided, thereby greatly eliminating speckle caused by common laser coherence.

The invention relates to the technical field of scanning detection, in particular to a machine visual line scanning device and system and an inspection vehicle. The machine visual line scanning devicecomprises an installing part, and a line scanning camera, a first light source and a second light source which are installed on the installing part. The installing part is used for fixedly installingthe machine visual line scanning device. The line scanning camera is installed on the installing part and used for collecting images of a tested object. The first light source and the second light source are arranged on the installing part and can rotate relative to the installing part so that the illumination ranges of the two light sources can at least be partly overlapped. At least part of theoverlapped area is located in the view range of the line scanning camera. By arranging the first light source and the second light source, by adjusting the relative angle of the two light sources, the illumination ranges of the two light sources are overlapped, and therefore speckles are eliminated, the scanning regional brightness is improved, the collected images are clearer, and the detectionreliability is improved.

A printhead module for printing laser light sources comprises: one or more printheads for printing multiple laser light sources on a substrate in sequence or once; the ink used for the printing comprises a luminescent dye, a matrix material and a solvent. The technical solution disclosed by the invention firstly makes the laser light sources by inkjet printing, which provides a new technical solution for inexpensive and industrial manufacture of various laser light sources and other related products; secondly, since the laser light sources are convenient to achieve a module including multiplegroups of independent laser light sources, each group of laser light source modules is enabled to be independent from each other when they emit light, and laser coherence between the emitted light isavoided, thereby greatly eliminating speckle caused by common laser coherence.

The invention relates to a screen electromagnetic vibration device applied to laser light source projection and capable of eliminating a speckle, comprising a screen, a plurality of vibration units are uniformly arranged on the back of the screen and can drive the screen to vibrate by virtue of an electromagnetic force, so as to eliminate the speckle; the vibration units can be of a contact structure directly pushing the screen to vibrate, and the contact structure comprises an electromagnetic coil, a vibration transmission layer, a vibration transmission block and a vibrating reed; and the vibration units also can be of a non-contact structure indirectly driving the screen to vibrate, and the non-contact structure comprises an electromagnetic coil and a permanent magnet block. The screenelectromagnetic vibration device provided by the invention adopts the electromagnetic force for directly pushing or indirectly driving the screen to vibrate, is better in laser speckle eliminating effect and has the advantages of simple structure, convenience in mounting, almost no damage and long service life.

The invention relates to a projection laser combining device with the application of laser to a wide-band light model, and belongs to the technical field of laser display. The invention aims to solvethe technical problems of poor illumination quality, high cost and no elimination of speckle of an existing laser projection device. The technical scheme is that the device comprises a laser module, alens group, a wide-band incoherent light source module, a converging lens and a light homogenizing tube, the lens group is disposed in front of the light emitted by the laser module, the wide-band incoherent light source module is disposed in front of the lens group, the converging lens is disposed in front of the wide-band incoherent light source module, and the light homogenizing tube is disposed in front of the converging lens.