48results about How to "Improve focus characteristics" patented technology

A field emission display (FED) is provided. The FED has an emitter structure where the emitter, a conductor and a cathode electrode are so arranged to produce a certain electric field about the emitter. The electric field about the emitter causes the electron beam emitted from the emitter to have improved focus and have less dispersion. This causes the electron beam to hit the intended pixel without exciting phosphor layers in neighboring pixels, thus improving image quality.

A gradient-index lens is structured by a multilayer film that includes therein a plurality of layers each of which has different refractive index and layer thickness from the other.

The invention discloses a long-focus tight-focusing surface plasmonic lens under a radially polarized beam. The surface plasmonic lens comprises a dielectric substrate and a metal thin film located on the dielectric substrate. A T-type micropore is etched in the center of the metal thin film. A periodical concentric ring structure is distributed on the periphery of the micropore. The periodical concentric ring structure comprises concentric ring grooves with the phase modulation function and peripheral concentric ring grooves. The radially polarized beam enters the surface plasmonic lens from the bottom, passes a metal-dielectric-metal type waveguide structure and effectively excites Spps in all directions; while the T-type micropore in the center enhances the intensity of the transmitted beam, tight focusing is formed by center hole transmission light and the Spps scattered to free space due to multiple-mode interference, phase positions of outlets of the stepped concentric ring grooves are regulated, a focal spot can be further compressed in cooperation with the antenna effect through multi-beam interference, the light intensity of a focal point is enhanced, the focusing characteristic of the lens is improved, and long-focus sub-wavelength tight focusing under the excitation of the radially polarized beam is realized.

The invention relates to a method for measuring frequency response function of a vibration structure in loud-noise environment, comprising the following steps: a linear swept-frequency signal is adopted as an excitation signal and acceleration response signals of the structure vibration is filtered in a fractional order Fourier domain by fractional order Fourier transformation, so that effect of noise in non-stationary process can be lessened, and measuring accuracy of the frequency response function is improved. Simultaneously, in the method, two groups of experiment signal data are expressed as one group of plural experiment signal data so as to avoid effect of superposition of two signal components, and only one-time filtering is needed to finish noise removal treatment of the two groups of the experiment signal data so as to improve noise removal effect and operating speed.

A zoom lens including a first lens unit exhibiting a positive refractive power and always being statically positioned along an optical axis when a power of the zoom lens is varied or the focusing is conducted and including a reflective optical element for bending an optical path, a second lens unit exhibiting a negative refractive power and including a negative lens, a negative lens and a positive lens, along the optical axis in this order from an object side, a third lens unit exhibiting a positive refractive power, a fourth lens unit exhibiting a positive refractive power, and including at least two positive lenses, and a fifth lens unit exhibiting a negative refractive power, wherein the second lens unit, the fourth lens unit and the fifth lens unit are moved for varying the power of the zoom lens.

The invention provides a method for determining multipath time delay and Doppler frequency shift in an underwater acoustic channel, and relates to an underwater acoustic channel estimation method. A transmitting terminal generates N linear frequency modulation signals and the signals are linearly superposed to serve as channel estimation signals, and the channel estimation signals are converted into sound waves through a transmitting transducer to be spread in ocean acoustic channels; a receiving terminal receives acoustical signals spread in the ocean acoustic channels through a receiving transducer and converts the acoustical signals into electrical signals, and digital signals are obtained through pre-amplification, smoothing and analog / digital conversion; fractional Fourier transformation corresponding to focusing orders is conducted on the digital signals and local reference signals N times and N peak position offset quantities with different orders are obtained through comparison; the multipath time delay and the Doppler frequency shift of all paths of the channel are determined by the adoption of a time-delay and frequency-shift joint estimation method according to the peak position offset quantities. By means of the method, the computational process is simple and system overhead is saved.

A novel field emission display (FED) and a novel method for making the same. The FED includes a substrate, a cathode electrode and a focus electrode formed on the same level with each other on the substrate, an insulation layer formed on the cathode electrode and the focus electrode such that the cathode electrode and the focus electrode are partially exposed through the insulation layer, a field emitter formed at the cathode electrode exposed by the insulation layer, and a gate electrode formed on the insulation layer. The field emitter being formed on the same layer and of the same material and at the same time as the cathode electrode.

The invention relates to a semiconductor laser glue solidification device and an application method thereof. The device comprises a semiconductor laser light source, an optical beam shaping system, an optical beam transmission system, an optical beam scanning system, an optical focusing system, and the like. The application method comprises the following steps of generating the laser light source through a semiconductor laser diode, carrying out the shaping transmission on the semiconductor laser light source by adopting the optical beam shaping system and the optical beam transmission system, focusing the semiconductor laser light source to the appropriate spot size and working position through the optical focusing system, and irradiating a workpiece or glue so that the temperature of the glue rises rapidly and the glue is solidified rapidly. The invention can carry out partial or fixed-point heating on the workpiece, has the advantages of rapid solidification, low cost, high energy utilization ratio, and the like and can be widely applied to the field of heating solidification of various glues.

The invention discloses a self-adaptive closed-loop control flying optical path mechanism and a control method thereof. The flying optical path mechanism comprises a laser, a flying optical path and a drive control system; the flying optical path comprises a flying focusing head and a binocular system; the binocular system comprises an eyepiece and an object lens; the flying focusing head comprises a plane mirror and a focusing mirror; the laser and the eyepiece are relatively fixedly arranged; light beams which are emitted by the laser are reflected to the focusing mirror for focusing by sequentially passing through the eyepiece and the object lens; and the drive control system can drive the object lens and the focusing mirror to carry out the reciprocating motion along an optical axial line according to the position signals of the flying focusing head and the focusing mirror. The flying optical path mechanism has high-performance self-adaptability, and can improve the focusing feature of the flying light beams, accurately and reliably compensate the change of the depth of focus of a laser focus point and obtain the set focus size and the depth of the focus through controlling the positions of the beam expanding object lens and the focusing mirror along with the change of the flying distance; furthermore, the method is simple and reliable, a complicated control unit of a deformable mirror is eliminated, the structure is simple, and the cost is low.

A scanning mirror includes a mirror base and a reflective film formed on the mirror base. The mirror base is formed from a non-metallic material having a specific rigidity, determined by Young's modulus (GPa) and density (g / cm3), of at least 100 GPa·cm3 / g.

In a cata-dioptric optical system having a combination of a reflection system and a refraction system for reduction-projecting an object on a first plane onto a second plane, a polarization beam splitter and a quarter wavelength plate are provided to split the incident light and the reflected light. The light beam directed to the polarization beam splitter is converted to a substantially collimated light beam by a first group of lenses. A second group of lenses are arranged between the polarization beam splitter and a concave reflection mirror to diverge the light beam. The light reflected by the concave reflection mirror is directed back to the polarization beam splitter with a substantially collimated state by the second group of lenses. The light beam from the second group of lenses transmitted through the polarization beam splitter is focused by a third group of lenses having a positive refraction power to form a reduced image.

A novel field emission display (FED) and a novel method for making the same. The FED includes a substrate, a cathode electrode and a focus electrode formed on the same level with each other on the substrate, an insulation layer formed on the cathode electrode and the focus electrode such that the cathode electrode and the focus electrode are partially exposed through the insulation layer, a field emitter formed at the cathode electrode exposed by the insulation layer, and a gate electrode formed on the insulation layer. The field emitter being formed on the same layer and of the same material and at the same time as the cathode electrode.

A liquid crystal display includes an illumination optical system which has a light source for emitting light and acts to irradiate the light from the light source on a light bulb on which an optical image is formed in accordance with a video signal, and a transmission-type liquid crystal display element for displaying the image information by the electrooptical effect of the liquid injected between a pair of transparent substrates of the light bulb. The liquid crystal display element is formed of a micro-lens array which has unit lenses provided to oppose the respective picture elements of the picture element array of the liquid crystal and thus to have the same array as the picture element array of the liquid crystal. Since this micro-lens array is closely attached to the side of liquid crystal display element to which the luminous flux emitted from the light source is incident, or integrally formed within the liquid crystal cell substrate, the liquid crystal display element has a high aperture ratio.

The invention relates to the technical field of laser beam control, in particular to a method and a device improving laser beam focusing capacity. The method comprises the steps of S1, extracting near field light distribution information of a laser beam, S2, calculating target far field light distribution information according to the near field light distribution information, S3, setting an evaluation function according to the target far field light distribution information, S4, extracting far field light distribution information, and S5, combining the evaluation function and the far field light distribution information to control far field light distribution in a closed-loop mode and improve the laser beam focusing capacity. According to the method and the device improving the laser beam focusing capacity, due to the adoption of the evaluation function which is more attached to an actual focusing limit, an optimal process of the laser beam focusing capacity is easier to control, the method and the device improving the laser beam focusing capacity is not prone to falling into a solved locally optimal solution, and therefore a better focusing character is capable of being obtained.

A zoom lens including a first lens unit exhibiting a positive refractive power and always being statically positioned along an optical axis when a power of the zoom lens is varied or the focusing is conducted and including a reflective optical element for bending an optical path, a second lens unit exhibiting a negative refractive power and including a negative lens, a negative lens and a positive lens, along the optical axis in this order from an object side, a third lens unit exhibiting a positive refractive power, a fourth lens unit exhibiting a positive refractive power, and including at least two positive lenses, and a fifth lens unit exhibiting a negative refractive power, wherein the second lens unit, the fourth lens unit and the fifth lens unit are moved for varying the power of the zoom lens.

A pair of magnets of which magnetizing direction differs from each other in the horizontal direction (X axis) are arranged at upper and lower portions of a funnel-side opening portion of a deflection yoke. The pair of magnets are held and fixed to a coil support body which supports horizontal deflection coils in a state where the magnets are embedded in the coil support body. In a projection type cathode ray tube of a single electron beam method, a locus of an electric beam which receives the deflection distortion is corrected so as to correct an electron beam shape on a screen to an approximately circular shape whereby a focusing performance of a display image on a screen is enhanced.

A color cathode ray tube apparatus includes: a valve; a phosphor screen; an electron gun including an electron beam generating portion for generating three electron beams, a focusing electrode, an anode electrode, a first field correction electrode and a second field correction electrode; and a deflector for deflecting the electron beams emitted from the electron gun, wherein the focusing electrode, the first field correction electrode, the anode electrode and the second field correction electrode form an electron lens having a focusing force in a vertical direction, which is perpendicular to the horizontal direction, stronger than its focusing force in the horizontal direction inside the focusing electrode, and having a diverging force in the vertical direction greater than its diverging force in the horizontal direction inside the anode electrode, by applying a focus voltage to the focusing electrode and the first field correction electrode and applying an anode voltage higher than the focus voltage to the anode electrode and the second field correction electrode.

A focusing electrode includes an electric field correcting electrode, and a peripheral electrode in which one electron beam passage aperture is formed on a surface opposed to a final-stage accelerating electrode. The final-stage accelerating electrode includes an electric field correcting electrode, and a peripheral electrode in which one electron beam passage aperture is formed on a surface opposed to the focusing electrode. In the focusing electrode, assuming that a distance from an end on the final-stage accelerating electrode side of the peripheral electrode to the electric field correcting electrode is L1, horizontal and vertical dimensions of the electron beam passage aperture of the peripheral electrode are H1, V1, and in the final-stage accelerating electrode, assuming that a distance from an end on the focusing electrode side of the peripheral electrode to the electric field correcting electrode is L2, and horizontal and vertical dimensions of the electron beam passage aperture of the peripheral electrode are H2, V2, relationships: L1<L2 and V1 / H1>V2 / H2 are satisfied. Because of this, the occurrence of a coma aberration of a side electron beam and the degradation in convergence are suppressed, and the dimension of a beam spot on a phosphor screen can be decreased.

A surface-emitting laser diode module having improved focusing performance includes a main body, a first support member, a second support member, a laser diode chip, and a focusing lens. The first and the second support members are disposed on the main body. One end of the first and the second support members is exposed in a trough formed on the main body. The other ends of the first and the second support members protrude from the main body and form a respective soldering portion. The laser diode chip is disposed on the first support member exposed in the trough and connected electrically to the second support member. The focusing lens is arranged at the light exit aligning the laser diode chip. The thinner and lighter laser diode module can provide better focus for dot or line laser applications.

A shadow mask is arranged to face a phosphor screen formed on an inner surface of a panel. A plurality of aperture columns are formed in parallel in the shadow mask. Each aperture column includes a plurality of apertures arranged in line at a predetermined interval. On both sides of each aperture column on the surface of the shadow mask facing the electron gun, stripe-shaped dielectric layers for acting on electron beams toward the apertures are formed respectively, and extend in substantial parallel with the aperture columns. The shadow mask is manufactured in such a manner that stripe-shaped insulating material layers are formed on the surface of a mask base material facing the electron gun, the mask base material is thereafter shaped into a predetermined shape, and the insulating material layers on the shaped mask are sintered.

A scanning mirror includes a mirror base and a reflective film formed on the mirror base. The mirror base is formed from a non-metallic material having a specific rigidity, determined by Young's modulus (GPa) and density (g / cm3), of at least 100 GPa·cm3 / g.

A method for measuring multipath time delay and Doppler frequency shift in an underwater acoustic channel relates to an underwater acoustic channel estimation method. The transmitting end generates N chirp signals and linearly superimposes them as channel estimation signals, and converts the channel estimation signals into acoustic waves through the transmitting transducer to propagate in the ocean underwater acoustic channel; The acoustic signal is received and converted into an electrical signal, and the digital signal is obtained after pre-amplification, filtering, and analog / digital conversion; the digital signal and the local reference signal are subjected to N times of fractional Fourier transform corresponding to the focus order and compared to obtain The peak position offsets of N different orders; according to the peak position offsets, the multipath time delay and Doppler frequency shift of each path in the channel are measured by the joint estimation method of time delay and frequency shift. The calculation process is simple and saves system overhead.

A field emission display (FED) is provided. The FED has an emitter structure where the emitter, a conductor and a cathode electrode are so arranged to produce a certain electric field about the emitter. The electric field about the emitter causes the electron beam emitted from the emitter to have improved focus and have less dispersion. This causes the electron beam to hit the intended pixel without exciting phosphor layers in neighboring pixels, thus improving image quality.

The invention manufacture an optical pickup unit which is high in the condensing characteristics necessary for recording and reproducing of a recording medium subjected to high-density recording. The method and device for regulating the astigmatism of an optical pickup unit consisting of at least a laser diode and an optical system for condensing the light beam formed by the laser diode to a recording medium as components consist in capturing the sectional shape of the light beam as an image by an image processor, measuring out-of-roundness from the relation between the major axis and minor axis of the captured image and moving the laser diode on the plane perpendicular to the progressing direction of the light beam with the nearly truly round position as an optimum position, thereby changing the incident angle of the light beam to the optical system and regulating the astigmatism.

Provided are a solid-state imaging device (1), a method of manufacturing the solid-state imaging device, and electronic equipment. A solid-state imaging device includes a substrate (22) in which a plurality of pixels (2) are formed. In addition, a plurality of grooves (27) are formed in the substrate, particularly in pixel isolation regions (31) between adjacent pixels. The groove extends from the first surface of the substrate toward the second surface of the substrate. A buried film (29) extends into the groove. At least some of the grooves include a first level adjacent to the first surface of the substrate and a second level adjacent to the second surface of the substrate, the first level and the second level being defined by walls of the groove, wherein the first level is wider than the second level, and wherein there is a step (15) between the first level and the second level. Additionally, the device includes a light shielding film (30) on the groove adjacent to the first surface of the substrate. A part of the light-shielding film is buried in the buried film extending into the groove.

A method corrects deflection defocusing in a cathode ray tube including an electron gun comprising a plurality of electrodes, an electron beam deflection device and a phosphor screen. This method includes placement of pole pieces of magnetic material in a deflection magnetic field produced by the electron beam deflection device and thereby locally modifies the deflection magnetic field in a path of an electron beam and corrects deflection defocusing of the electron beam corresponding to deflection of the electron beam in amount.

A shadow mask is arranged to face a phosphor screen formed on an inner surface of a panel. A plurality of aperture columns are formed in parallel in the shadow mask. Each aperture column includes a plurality of apertures arranged in line at a predetermined interval. On both sides of each aperture column on the surface of the shadow mask facing the electron gun, stripe-shaped dielectric layers for acting on electron beams toward the apertures are formed respectively, and extend in substantial parallel with the aperture columns. The shadow mask is manufactured in such a manner that stripe-shaped insulating material layers are formed on the surface of a mask base material facing the electron gun, the mask base material is thereafter shaped into a predetermined shape, and the insulating material layers on the shaped mask are sintered.

The invention discloses a self-adaptive closed-loop control flying optical path mechanism and a control method thereof. The flying optical path mechanism comprises a laser, a flying optical path and a drive control system; the flying optical path comprises a flying focusing head and a binocular system; the binocular system comprises an eyepiece and an object lens; the flying focusing head comprises a plane mirror and a focusing mirror; the laser and the eyepiece are relatively fixedly arranged; light beams which are emitted by the laser are reflected to the focusing mirror for focusing by sequentially passing through the eyepiece and the object lens; and the drive control system can drive the object lens and the focusing mirror to carry out the reciprocating motion along an optical axial line according to the position signals of the flying focusing head and the focusing mirror. The flying optical path mechanism has high-performance self-adaptability, and can improve the focusing feature of the flying light beams, accurately and reliably compensate the change of the depth of focus of a laser focus point and obtain the set focus size and the depth of the focus through controlling the positions of the beam expanding object lens and the focusing mirror along with the change of the flying distance; furthermore, the method is simple and reliable, a complicated control unit of a deformable mirror is eliminated, the structure is simple, and the cost is low.