74results about How to "High reflection coefficient" patented technology

A surface acoustic wave device includes a piezoelectric substrate made of LiNbO₃ having an electromechanical coupling coefficient k whose square is at least about 0.025, at least one electrode that is made of a metal whose density is greater than that of Al or an alloy primarily including the metal or that is composed of laminated films made of a metal whose density is greater than that of Al or an alloy primarily including the metal and another metal, the electrode being disposed on the piezoelectric substrate, a first insulating layer disposed in a region other than a region where the at least one electrode is disposed, the thickness of the first insulating layer being substantially equal to that of the electrode, and a second insulating layer covering the electrode and the first insulating layer. The density of the electrode is at least about 1.5 times greater than that of the first insulating layer.

A light-emitting unit 20 has a light-emitting unit board 21 made of resin provided with a lead frame 22. The light-emitting unit board 21 is also provided with an open window 21a for mounting a light-emitting device. The lead frame 22 comprises a lead terminal section 22a, an inner lead section 22c, and a light-emitting device mounting and connecting section 22b which is exposed within the open window 21a. The light-emitting devices 23a, 23b, and 23c are bonded with the light-emitting device mounting and connecting section 22b, and electrodes of the light-emitting devices and the lead frame are connected by a metal wire 24, wherein the open window 21a is sealed by transparent resin. The lead frame 22 is made of iron-containing copper to improve heat radiation performance of the light-emitting unit board. By increasing maximum current to be supplied to the light-emitting diodes, it is possible to increase illumination brightness and to attain speedup of image reading.

The invention relates to an integrated surface acoustic wave (SAW) wireless temperature sensor, comprising an interdigital transducer with an EWC/SPUDT structure and 11 reflectors with short-circuit gate structures, which are manufactured on a piezoelectric substrate, wherein, the EWC/SPUDT receives an electromagnetic wave signal transmitted from a wireless reading unit by a wireless antenna and transforms the signal into surface acoustic wave which is propagated along the reflectors on the surface of the piezoelectric substrate and is respectively reflected by the reflectors, the reflected acoustic wave is retransformed into the electromagnetic wave signal by an EWC/SPUDT2, the signal is returned to the wireless reading unit by the wireless antenna, and finally temperature detection is realized by evaluation on a phase change of time-domain response via a signal processing method. In the sensor, the 11 reflectors of a SAW reflection delay line are divided into two paths for reducing multiple reflection among the reflectors, wherein, 8 reflectors on one path are used for 8-bit electronic tags, and 3 reflectors on the other path are used for temperature detection; and a reflection peak of a time domain S11 with even response is obtained by adjusting electrode number of the reflectors.

According to an embodiment, a storage medium includes a transparent resin substrate having a concentric or spiral groove and a recording film formed on the groove on the transparent resin substrate, a recording mark being formed by irradiation of a laser beam, wherein a reproduction durability count in a case where reproduction is continuously carried out by a laser beam is 1,000,000 or more.

The invention discloses a K-waveband coaxial relativistic backward wave oscillator. The oscillator comprises positive electrode, a negative electrode, an electron beam guide grid mesh and a coaxial inner conductor, wherein the positive electrode is a cylindrical waveguide cavity containing a slow-wave structure; the negative electrode is arranged in the cylindrical waveguide cavity and connected with one end plane of the positive electrode through an insulator; the electron beam guide grid mesh is arranged in the cylindrical waveguide cavity and positioned in the downstream of the electron transmitting end of the negative electrode; the coaxial inner conductor adopts a cylindrical structure; one end of the coaxial inner conductor is arranged in the cylindrical waveguide cavity while the other end of the coaxial inner conductor is connected with the other end plane of the positive electrode through a metal bracket; and a coaxial structure is formed by the coaxial inner conductor, the negative electrode and the cylindrical waveguide cavity. According to the K-waveband coaxial relativistic backward wave oscillator, the electron beam guide grid mesh with the electron beam transmittance of greater than 90% is adopted for guiding electron beams to enter a beam interaction region, so that the required external magnetic field intensity is lowered, the guide magnetic field required by a device is reduced to 0.5T, the huge size of the guide magnetic field system on the exterior of the device is reduced, and requirement on the energy source supply is reduced.

The invention relates to a method for measuring protection of a sunscreen cosmetic, which is characterized by comprising the following steps: a solution to be tested and a blank reference solution containing no cosmetic to be measured are prepared; then an integrating sphere is arranged between an absorption pond and a detector in an ultraviolet-visible spectrophotometer, the blank reference solution is employed for blank correction on the ultraviolet-visible spectrophotometer; the solution to be tested is added in the absorption pond of the ultraviolet-visible spectrophotometer finally, the solution to be tested is tested, the ultraviolet absorption spectrum of the solution to be tested is measured, and the cosmetic to be measured has better protection effect due to higher absorbance. According to the invention, the ultraviolet-visible spectrophotometer of the integrating sphere is increased for measuring the absorbance of the cosmetic to be measured, thereby the sunscreen effect of the cosmetic to be measured can be measured, the measurement method has the advantages of simple operation, low measurement cost, high credibility and accuracy, and easy popularization and application.

A unidirectionally operating laser apparatus using a semi-monolithic ring cavity having a compact structure capable of achieving a high frequency stability and a high-speed laser frequency tuning and modulation. The laser apparatus includes a laser active medium having a curved surface exhibiting an anti-reflection characteristic for a pump laser beam from a pump laser incident thereon while exhibiting a high reflection characteristic for an oscillating laser beam, a planar surface exhibiting an anti-reflection characteristic for the oscillating laser beam, and an optically-active polarization rotator attached to one side portion of the planar surface. The laser apparatus also includes an output mirror separated from the laser active medium, the output mirror having a curved surface with a coating exhibiting a higher reflectance coefficient for S-polarized beams than that for P-polarized beams, and a piezo-electric transducer. The laser apparatus is applicable to a variety of scientific fields using continuous-wave wavelength-tunable lasers.

The invention discloses an array antenna, and particularly relates to a seam-variable large-bandwidth traveling wave seam array antenna with a radiation-type load. The seam-variable large-bandwidth traveling wave seam array antenna with the radiation-type load solves the problem that an existing dielectric integrated waveguide seam array antenna is small in impedance bandwidth. The seam-variable large-bandwidth traveling wave seam array antenna comprises a radiation metal layer, a first dielectric slab, a feed metal layer, a ridge metal layer, a second dielectric slab, a bottom metal layer, a trapezoid metal layer, a strip-shaped metal layer, a first metal wafer and a second metal wafer. Both the first dielectric slab and the second dielectric slab are rectangular slabs, the feed metal layer is a strip-shaped metal sheet, the ridge metal layer is a rectangular metal sheet, and the radiation metal layer, the first dielectric slab, the feed metal layer, the ridge metal layer, the second dielectric slab and the bottom metal layer are sequentially arranged from top to bottom in an overlapping mode. The seam-variable large-bandwidth traveling wave seam array antenna with the radiation-type load is applied to the radio field.

A reflectable metal film having a light transmission hole 5 is formed on an inner surface of a transparent substrate 2, and a light transmission region 7 and a light reflection region 8 are arranged within each of pixel regions on the inner surface of the transparent substrate 2. A first color filter 9 and a second color filter 10 of a similar color that differs in tone are formed in each of the pixel regions. A boundary 11 between the first color filter 9 and the second color filter 10 in each of the pixel regions is positioned in the light reflection region 8 in the pixel region.

An information layer 0 comprises a system lead-in area, data lead-in area, data area, and middle area, an information layer 1 comprises a system lead-out area, data lead-out area, data area, and middle area, an end position of the data area of layer 1 is positioned outer than a start position of the data area of layer 0, the data lead-in area comprises a guard track zone wider than a test zone in the data lead-out area, the data lead-out area comprises a guard track zone wider than a test zone and a management zone in the data lead-in area, the middle area of layer 0 comprises a guard track zone wider than a test zone in the middle area of layer 1, and the middle area of layer 1 comprises a blank zone wider than a test zone in the middle area of layer 0.

The invention relates to a package process of a light emitting element, comprising: an electrode setting step, an illuminant setting step, a contact step and a combining step. In the electrode setting step, a anode and a cathode are defined; in the illuminant setting step, a light emitting diode wafer having an anode and a cathode is used as an illuminant ; in the contact step, the defined anode and the cathode as well as the anode and the cathode on the light emitting diode wafer are communicated and combined into a whole; and in the combining step, the defined anode and the cathode and the light emitting diode wafer are tightly combined into a whole. In the package process of the light emitting element, the electrode of the light emitting diode wafer can be communicated with an outside electrode in advance, thereby work for assembling posterior-segment products can be simplified, the productivity can be increased, and the production cost can be reduced.

The invention discloses a dark-color reflective and heat insulation varnish and a preparation method thereof, relating to the field of coatings. The dark-color reflective and heat insulation varnish comprises the following components in parts by weight: 320-380 parts of an elastic emulsion, 40-80 parts of a fluorocarbon emulsion, 220-270 parts of filler, 4-6 parts of a dispersing agent, 3-5 parts of a defoaming agent, 5-10 parts of a film-forming additive, 3-5 parts of a flatting agent, 5-8 parts of a thickening agent, 2 parts of a mildew-proof and alga-proof agent, 2 parts of a bactericide, 3-5 parts of a wetting agent and 200-250 parts of deionized water. The varnish belongs to an environment-friendly coating, not only is high in reflection coefficient and radiation coefficient, free of grinding and good in decoration property, but also does not contain APEO and cannot generate hazards to the environment and human health.

The invention belongs to the technical field of preparation, and discloses an ultralimit ferroalloy and a preparation method thereof. The ultralimit ferroalloy comprises a ferroalloy matrix, and a composite bonding layer, a composite ceramic layer, a reflecting layer, a reverse refraction layer, an insulating layer and a foam carbon layer are deposited on the surface of the ferroalloy matrix in sequence; the composite bonding layer comprises a bonding layer deposited on the surface of an aluminium alloy matrix, and a precious metal layer deposited on the surface of the binding layer; and the composite ceramic layer comprises a ceramic layer A and a ceramic layer B. According to the ultralimit ferroalloy, through deposition of a plurality of coatings on the surface of the ferroalloy matrix,the service temperature of the ultralimit ferroalloy can be increased to 100 DEGC-500 DEGC higher than the melting point of the original ferroalloy matrix, so that the application of the ferroalloy in ultralimit environment is achieved. The ultralimit ferroalloy provided by the invention has excellent high-temperature mechanical and chemical stability, and can be used under the condition of exceeding the melting point of the ferroalloy matrix; and the application range is expanded.

The invention belongs to the technical field of microwave engineering and specifically relates to a circular waveguide wave-mode suppressor capable of suppressing a TE11-mode microwave and a design method thereof. The circular waveguide wave-mode suppressor comprises a circular waveguide. The circular waveguide is provided with a first cavity, a second cavity, a third cavity, a fourth cavity and afifth cavity in sequence in the microwave transmission direction. A first transition waveguide is arranged between the first cavity and the second cavity; a second transition waveguide is arranged between the second cavity and the third cavity; a third transition waveguide is arranged between the third cavity and the fourth cavity; and a fourth transition waveguide is arranged between the fourthcavity and the fifth cavity. The circular waveguide wave-mode suppressor can effectively filter the TE11-mode microwave, so that a TM01-mode microwave is allowed to be transmitted more efficiently; and verification is realized based on a numerical simulation program, such as CST-MWS and HFSS software, and simulation results show the suppressor can be used in various wave bands.