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382results about How to "Reduce size and weight" patented technology

Image combiner and image display unit

During use, a plate-form part 5 which is constructed from an optical material and which corresponds to a spectacle lens is positioned in front of the eye of the user which is disposed in the vicinity of the exit pupil P of an image combiner 1. The combiner 1 causes light from an image display element 2 to be superimposed on light that is transmitted through the plate-form part 5 so as to pass through the thickness of the plate-form part 5 from the front of the plate-form part 5, and conducts this light to the eye. The light from the image display element 2 reaches the eye of the user after being diffracted and reflected by a reflective type HOE 6 inside the plate-form part 5. The wavelength at which the diffraction efficiency shows a maximum value when the chief rays that are emitted from the center of the display part of the image display element 2 are diffracted and reflected by the reflective type HOE 6 and the wavelength at which the diffraction efficiency shows a maximum value when the chief rays that are emitted from the peripheral portions of the display part in a specified direction are diffracted and reflected by the reflective type HOE 6 are substantially different. As a result, it is possible to improve the image quality of the display images that are obtained in cases where the center of the pupil of the eye of the user deviates from the center of the exit pupil of the image combiner.
Owner:NIKON CORP

Peripheral component interconnect (PCI) Express bus-based multiband infrared image real-time acquisition system and method

The invention discloses a peripheral component interconnect (PCI) Express-based multiband infrared image real-time acquisition system and a PCI Express-based multiband infrared image real-time acquisition method. The system comprises an embedded host with a PCI Express x8 channel and a real-time image acquisition card, wherein the real-time image acquisition card comprises a field programmable gate array (FPGA) chip, a high-speed caching double data rate 2 synchronous dynamic random access memory (DDR2SDRAM), differential I/O interfaces connected with a multiband infrared detector and a PCI Express x8 card insertion part. The acquisition method for the system comprises that: the FPGA chip of the acquisition card simultaneously reads multiband infrared image data from the differential I/O interfaces, caches the read multiband infrared image data into the DDR2SDRAM, performs PCI Express bus bandwidth allocation after finishing acquiring an image frame, transmitting the data of the image frame to the host by a PCI Express x8 bus for real-time display and storage, and simultaneously caches the acquired data of the next image frame. The invention has the advantage of integrating a plurality of infrared band data discrete acquisition systems to form the multipath, high-speed, synchronous and real-time acquisition system which is miniature and highly portable.
Owner:SHANGHAI INST OF TECHNICAL PHYSICS - CHINESE ACAD OF SCI

Seabed observation network node platform

The invention relates to a seabed observation network node platform comprising a box body in which a photoelectricity separating device, a wiring board, a high-voltage power supply cavity, a low-voltage power supply cavity and control system cavity, wherein the photoelectricity separating device is connected with a coast base station, an electric signal output end and an optical signal output endof the photoelectricity separating device are correspondingly connected with the input ends of a high-voltage wet plugging assembly and an optical fiber wet plugging assembly, the output ends of the high-voltage wet plugging assembly and the optical fiber wet plugging assembly are respectively connected with the low-voltage power supply cavity and the control system cavity, and the control systemcavity is in communication connection with seabed external equipment through an external equipment wet plugging assembly; the output end of the high-voltage power supply cavity is connected with the input end of the low-voltage power supply cavity, and the output end of the low-voltage power supply cavity is connected a power source input end of the control system cavity which is internally provided with a communication control system for data communication with the seabed external equipment and a power source management system. The invention can provide continuous power energy for the seabedexternal equipment and realizes the real-time and continuous communication between the coast base station and the seabed external equipment.
Owner:ZHONGTIAN TECH MARINE SYST CO LTD

Displacement amplifying type 2D electro-hydraulic proportional directional valve

The invention provides a displacement amplifying type 2D electro-hydraulic proportional directional valve. The displacement amplifying type 2D electro-hydraulic proportional directional valve is that the right end of the 2D valve is fixedly connected with a bidirectional electric-mechanical conversion device through a roller type pressing torsion coupling and a pin; a wedge-shaped part is in contact with a central shaft through a roller; a right sensitive cavity is formed between a right circular bead at the end part a valve element, an end cover of the pressing torsion coupling and a valve body; a left sensitive cavity is formed between a left circular bead at the end part of the valve element, a left piston ring and the valve body; high pressure holes are formed in the circular beads at the end parts and are communicated with a P opening through inner holes of the valve element; low pressure holes are formed in the end part of the valve element and directly communicated with the T opening; sensitive channels of which the diameter is in a form of a semicircular section are formed in the upper two ends of the inner hole wall of the valve body; the sensitive channels are respectively communicated with the left sensitive cavity and the right sensitive cavity; the high and low pressure holes in the circular beads in two ends of the valve element are intersected with the sensitive channels to form two micro opening areas which are connected in series to form hydraulic resistance half axles; pressure of the sensitive cavities in two ends is respectively controlled by the hydraulic resistance half axles at two ends.
Owner:ZHEJIANG UNIV OF TECH

Micro-displacement optical test method and device thereof

The invention relates to a micro-displacement optical testing method and a micro-displacement optical testing device, in particular to a micro-displacement micro-strain testing method and a micro-displacement micro-strain testing device, which adopts the following steps: 1. taking a lever and a projection plane; 2. taking one point on a short arm of the lever as the input end of the micro-displacement, inputting the micro-displacement to be tested from the input end of the micro-displacement, using a light spot displacement measuring device to measure the displacement value of the light spot after enlarging the lever, and gaining the micro-displacement to be tested through the calculation. The invention uses the following devices which comprises the light spot displacement measuring device and the lever, wherein the lever is arranged on a support and takes one point on the short arm of the lever as the input end of the micro-displacement to be tested, a long arm of the lever is provided with a laser, the frontage of the laser is provided with the projection plane for displaying the displacement of the light spot, and the light spot displacement measuring device is used to gain the displacement of the light spot emitted by the laser and calculate the micro-displacement. The invention realizes the purpose of simplifying the structure and making the testing process conveniently operated.
Owner:SOUTHEAST UNIV

Multi-level converter employing multi-winding intermediate-high frequency transformer

The invention relates to a multi-level converter employing a multi-winding intermediate-high frequency transformer. The multi-level converter comprises a voltage current measuring unit, wherein the voltage current measuring unit is connected between two ends of a power grid in parallel; the voltage current measuring unit sends a measured voltage current signal of the power grid to a control unit; a current signal output by the power grid is filtered and current-limited by an inducer and then is input in a H-bridge rectifier; the H-bridge rectifier converts the input alternating current into the direct current with stable amplitude according to the control signal sent by the control unit; the output end of the H-bridge rectifier is connected with a plurality of inverters; the output ends of the inverters are connected the input end of the multi-winding intermediate-high frequency transformer; the output end of the multi-winding intermediate-high frequency transformer is connected with a load converter through a plurality of rectifiers; a voltage current measuring module, all inverters and all rectifiers perform information interaction with the control unit; and the load converter supplies power to the load under the control of the control unit. The cost of the multi-level converter in the invention is saved; the size and the weight of the multi-level converter are reduced; and the multi-level converter can be widely applied in an electrical system and electric traction.
Owner:TSINGHUA UNIV

Dexterous hand driven by shape memory alloy

The invention discloses a dexterous hand driven by shape memory alloy. The dexterous hand comprises three fingers which are structurally consistent, a palm and a control system. Each finger is composed of distal knuckle bone, a middle knuckle bone and a proximal knuckle bone. Bending and stretching of one whole finger are achieved by finger joints, side sway of the fingers is achieved by the joints among the proximal finger bones, and bending and stretching of the distal knuckle bones are achieved by the joints among the distal finger bones. The three fingers have nine joint freedom degrees totally, and each joint is driven forwardly and reversely by a swinging mechanism composed of two shape memory alloy metal wires. The control system comprises a Windows PC (personal computer), a real-time controller, an I/O (input/output) module, a drive circuit and an angular sensor. The shape memory alloy metal wires are internally disposed in the fingers and the palm of the dexterous hand to directly drive the finger joints, and accordingly a medium drive mechanism is omitted. The dexterous hand is simple and compact in structure, small in size and light in weight and is suitable for being used as an end actuator of a mechanical arm which is light in load to implement dexterous grabbing and precision operation of objects different in shape and size.
Owner:ZHEJIANG UNIV
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