89 results about "Crest line" patented technology

A light guide plate and a side-emitting backlight module having the same are disclosed. The light guide plate includes a transparent substrate, a plurality of prisms and a plurality of condensing lenses. The prisms are arranged side by side on one surface of the transparent substrate. The condensing lenses are disposed between two adjacent prisms, and distributed from sparsely to densely along a direction of a crest line of each of the prisms.

The fingerprint image enhancement method based on knowledge includes the steps: image pre-treatment; direction field estimation to calcualte the direction of each pixel in fingerprint image; binarization to change fingerprint image into black-white image according to pixel direction; fining the binary image; detail post-treatment to eliminate burr, spot and bridge in fined image to avoid pseudo detail; feedback enhacement with the knowledge rules; and extracting detail points including crest line end points. The said technology can be used to extract the details in fingerprint image and has important application value in biological recognition.

The invention discloses a substructure-based twins similar fingerprint recognition system and a method. The recognition system comprises a preprocessor, a substructure template device, and a detailed point substructure matching device. The method comprises the following steps: preprocessing a collected fingerprint image and obtaining a refined image of the fingerprint; picking up crest line tip ends and forked detailed points P, constructing substructures based on the aggregate of the picked detailed points P, and generating a fingerprint template through assembling the substructures of the fingerprint; comparing the inputted fingerprint substructure template with fingerprint templates in a database, calculating the differentia of relative position and orientation parameters between substructures and judging whether two fingerprints are matched with each other. The invention adopts the detailed point substructures, thereby not only remarkably improving the twins similar fingerprint recognition performance of the automatic fingerprint recognition system, but also solving the problem of reduced recognition rate due to similar global features of two fingerprints and widening the application of the fingerprint recognition system in the special group of twins.

A solar cell and a method for fabricating the same are described. A pyramid structure is formed on a silicon substrate. A laser treatment is performed on the pyramid structure, so that a top portion of the pyramid structure has an arc shape, and a round is formed at a crest line of the pyramid structure. Films formed during subsequent processes hence have a uniform thickness and conversion efficiency of the solar cell is improved.

The invention relates to a reverse hole distributing method used in longhole bench blasting. In the reverse hole distributing method, the number of hole rows to be distributed in a blasting area, hole spacing and row spacing are determined in a conventional way, and then the holes are distributed by the following steps of: A, determining a minimum front-to-back spacing, B, distributing holes in the last row, C, distributing holes in other rows forwards in sequence, and D, adjusting the positions of holes in the frontmost row: adjusting the holes in the frontmost row in a fine adjustment way, a great adjustment way or a hole compensating way according to the orderliness condition of a bench crest line and the variation of a bench resistance line. The reverse hole distributing method can be used for realizing the orderliness of the blasted bench crest line; the distributed holes are distributed linearly so that the movement of a drilling machine and the aligning of drilled holes are facilitated and the drilling efficiency of the drilling machine is increased; and the reverse hole distributing method is beneficial to overcoming the defects of the traditional hole distributing method, is simple and feasible, can ensure a blasting effect, and is convenient to realize blasting operation standardization.

The invention discloses a high-precision spectrum analyzer using a stimulated Brillouin light loss mechanism in an all-wave fiber. By using the characteristic of wide inherent stimulated Brillouin scattering crest line of the all-wave fiber, based on the stimulated Brillouin light loss effect in the fiber, optical power loss is detected when output light of a scanning laser (TLS) generates stimulated Brillouin interaction in the all-wave fiber together with a to-be-detected signal (SUT) light for carrying out spectral measurement and analysis, and an ultra-high precision spectrogram of the SUT light is obtained. In a spectral analysis process, a constant-temperature device is used for eliminating frequency shift (about 11GHz) drift caused by temperature change of stimulated Brillouin scattering in the fiber, and further the precision and the reliability of the high-precision spectrum analyzer are improved; and meanwhile, a temperature and drive current tunable distributed feedback semiconductor laser is creatively used as a wavelength scanning laser light source, so that the high-precision spectrum analyzer has the characteristics of low cost, high reliability, flexibility and convenience.

To effectively increase the strength of the framework of a large size vehicle, a reinforcing member (12) with a substantially closed, triangular cross-section is arranged in a polygonal hollow cross-section (7) at the corner (3) of a front post (1) and top rail (2) for connecting the vehicle. The edges (13, 15) of the reinforcing member (12) transect the hollow cross-section (7) at the vicinity of the crest lines (8, 16) of the hollow cross-section (7) respectively, and then extend to the vicinity of the crest line (14) at the top front side of the vehicle.

The invention discloses a high-strength corrugated board adhesive and a production method thereof. The adhesive is prepared in such a way that starch, flake caustic soda, water, borax, a catalyst, a reducing agent and the like are subjected to chemical synthetic reaction under certain temperature. The prepared adhesive glue is stable. Right amount of cured starch paste with high viscosity and poor liquidity is accurately and uniformly smeared on the corrugated crest lines and satisfies the adhesion mechanism of the high-strength corrugated boards. The adhesive can solve the problems of rib lines such as exposed marks of low-weight boards and the quality problems such as adhesive failure, foam formation, pseudo adhesion, warping, etc of the boards.

The present invention relates to a mechanical optical switch which is mainly used in optical communication system, optical fibre network system, optical fibre measurement system or instrument and optical signal exchange in optical fibre sensing system. Said invention incldues fixed prism and collimator gripper directed at oblique plane of fixed prism. All the two outgoing collimators and one incoming collimator or two incoming collimators are mutually parallelly placed in same collimator gripper along central axis. It also possesses a movable prism, said movable prism is controlled by relay, and can be moved into or moved out of the optical circuit. The movable prism and fixed prism are isosceles rectangular total reflection prism, and the oblique plane is incident face of light, and saidincident face is coated with anti-reflection film, and two rectangular plane are reflecting plane, and two rectangular crest lines of movable prism and fixed prism are mutually perpendicular in the optical circuit. Its switching time is short, and its typical switching time can be 6 ms.

The invention provides an electric power steering assistance control method. On the basis of a basic assistance curve, according to the history state and the existing state, a torque variation tendency is operated; according to the operation, an assistance curve section is selected, the control characteristic of a practical controller biases to an ideal assistance curve shape so as to lower friction influence, quicken aligning speed and improve feel; a zero curve is an assistance curve when the torque is smaller, the first curve is a steering and aligning base line when the torque various tendency is smaller, the second curve is a steering and aligning crest line when the torque various tendency is smaller, and the third curve is a steering and aligning acceleration line when the torque various tendency is bigger. The invention can carry out certain logic judgment for torque variation tendency, and the control characteristic of the practical controller is caused to bias to the ideal assistance curve shape according to a certain mathematical model, thus lowering friction influence, quickening aliening speed and improving feel.

The invention relates to a self-tapping and self-boring osteosynthesis screw for compressive orthopaedic surgery, characterised in that, in the bone engagement regions, at both the distal portion (A1a) and at the proximal portion (A2a), the sum of the angles defining the outer taper of the shank (f) and the taper of the crest line of the screw thread pitch (P) is higher than 45°, and in that the leading portion (i.e. the most distal one) of each thread includes a plurality of cutting edges (AR) obtained by stock removal.

A book scanner for scanning two adjacent pages in documents bound in volume includes a housing, two image scanning units, and a conveying device. The housing has two scanning tables connected to each other. An included angle is formed between the two scanning tables and a crest line is formed at a connection of the two scanning tables. The two image scanning units are movably disposed in the housing to project a scanning light through a window of each scanning table respectively, so as to scan images of the two adjacent pages. The two image scanning units are connected to the conveying device to be supported and moved relative to the corresponding scanning tables in a direction parallel to the crest line, so as to be moved simultaneously and to scan the images of the two adjacent pages respectively.

An optical film includes a light transmissive substrate having a first surface and a second surface opposite thereto, strip protrusions on the first surface, and protruding structures on crest lines of the strip protrusions. Each strip protrusion has two strip surfaces. Each protruding structure has a protruding end protruding from the crest line of the corresponding strip protrusion and two wing portions on the strip surfaces of the corresponding strip protrusion. Each wing portion extends from the protruding end to a place between the crest line and a valley line. A length of the protruding structure parallel to an extension direction of the crest line is L, a width of the protruding structure perpendicular to the crest line is W, and L/W≧1.2. At least one of a moiré phenomenon, a local adherence phenomenon, a scratching phenomenon, and a wearing phenomenon with other optical devices is effectively mitigated.

The invention discloses a vibrating diaphragm and loudspeaker, wherein the vibrating diaphragm includes an intermediate part and a folding ring part surrounding the periphery of the intermediate part,the folding ring part includes a first straight side part, a second straight side part, and an arc-shaped corner part connecting the first straight side part and the second straight side part, the arc-shaped corner part and end parts of the first straight side part and the second straight side part which are connected with the arc-shaped corner part form a corner area; a pattern is arranged on the corner area, the pattern extends in an up-down undulating shape along a surrounding direction of the folding ring part in the position of the pattern and has a plurality of crest lines and trough lines, the cross section of the pattern along the surrounding direction of the folding ring part in the position of the pattern is arranged to be a continuously bent smooth curve, and the smooth curve has a plurality of crest lines and trough lines. Through the technical scheme of the invention, the stress concentration phenomenon of the folding ring part of the vibrating diaphragm can be reduced and the performance reliability and acoustic performance of the loudspeaker can be improved.

The related chamfering control method for spiral bevel gear comprises: according to machine tool configuration and movable coordinate, calculating and controlling cone positioning knife and tooth-space convex-concave side crest line to determine the position relation between work piece tooth space and main shaft of machine tool for double touch. Wherein, the control calculation is based on bi-face chamfering. This invention is simple and convenient.

The invention relates to a technology and a device for measuring errors of a face gear by scanning single-face meshed rolling points, belonging to the field of the technology and the device for precision measuring and metering. A spaced-tooth measuring element with a special measuring crest line is combined with the face gear to the measured to form single-face meshing drive; round grating signals which are installed coaxially with the spaced-tooth measuring element and the face gear to the measured are collected; and the signal geometric error and the integrated drive error of the face gear to be measured are obtained through processing the round grating signals by a computer. In the invention, the signal geometric error and the integrated drive error of the face gear to be measured are measured rapidly and accurately in the process of clamping the face gear for one time, and the integrated motion precision of the drive pair of the face gear can be measured rapidly and accurately.

A mold machining method for computer numerical control includes steps of establishing a 3D pattern; performing an initial machining process on a mold material by the 3D pattern; calculating a total machining area corresponding to the 3D pattern; dividing the 3D pattern into a plurality of precise machining regions according to the total machining area and a predetermined machining area and enabling a boundary line between every two adjacent precise machining regions to be corresponding to a crest line of the 3D pattern; and performing a precise machining process on each of the precise machining regions and changing a cutting tool at the boundary line between every two adjacent precise machining regions.

The vision system for an aircraft according to the invention comprises a display management system, on a display, capable of dynamically displaying synthetic information coming from a synthetic environment generating assembly on the display. The management assembly can control the display, on a first region of the display, of relief lines representative of the terrain situated facing the aircraft, without displaying synthetic surface representations of the terrain in the intermediate areas situated between the relief lines of the first region of the display. The generating assembly includes means for determining the position of the crest lines of the terrain from topographical data present in at least one database, and means for computing the position of the relief lines from the position of the crest lines of the terrain.

The invention discloses (110) dislocation-free monocrystalline silicon and its preparation and the graphite heating system used. The process for preparation is as follows: clearing furnace and tidy the heat field; loading furnace; vacuumizing and argon charging; heating raw material; crystal seeding; expanding shoulder; rotating shoulder: speeding up the speed of shoulder-expanding; equal diameter: after shoulder-rotating, stabilize the crystal growth speed; finishing: turning off the power of crucible, decreasing the drawing rate manually; turning off the furnace. The graphite heating system includes: upper insulation column, lower insulation column and hearth tray arranged from the top down to form the external shell, and the peripheral surface is a stepped structure, and the thickness of the insulation layer of the upper insulation column is 20-30 mm, the thickness of the insulation layer of the lower insulation column is 60-70 mm, and the thickness of the insulation layer of the hearth tray is 70-80 mm. (110) dislocation-free monocrystalline silicon is cylinder structure, on its expanded shoulders 2 symmetrical main crest lines and 4 symmetrical sub-crest lines are formed, and 2 symmetrical main crest lines are formed on crystal cylinder surface. The present invention realizes manufacturing (110) dislocation-free monocrystalline silicon so as to meet the demand of the domestic and international markets.

The invention provides a Chinese tone recognition method based on time frequency crest line-Hough transformation. Chinese tone recognition is converted into classification of the change trend of a line segment in a time frequency distribution diagram so that a new Chinese tone recognition method and technique can be acquired. The method includes the steps that firstly, final voice signals carrying Chinese tones are expressed through the SPWVD time frequency distribution diagram and tone information is shown through a group of similarly-parallel time frequency crest lines in the time frequency diagram; secondly, due to the fact that the main time frequency crest line is a region with larger energy in the diagram, the change trend of different tones is reflected, and in order to reduce the calculated amount, treatment such as binaryzation, thresholding and refining is conducted on the time frequency distribution diagram, and a center line segment of the main time frequency crest line reflecting the change trend of the tones is acquired; thirdly, Hough transformation is conducted on the time frequency distribution diagram containing the center line of the main crest line, so that the intercept and included angle parameters of the center line of the main crest line are acquired; finally, the tone type is judged according to the intercept and the included angle of the line segment and the coordinate values of a start point and an end point of the line segment.