摘要:
The present invention relates to a transformer. In the transformer, secondary winding sections are placed in both sides of a primary winding section, all terminals of the secondary winding sections are used as output terminals, and an input terminal is placed in the opposite side to the output terminals. Therefore, a return wire in the high-voltage output side does not need to be provided, and a sufficient insulation separation distance is secured in the relation with a printed circuit board, which makes it easy to implement a circuit. Further, improved efficiency is obtained over a conventional transformer, there is a significant reduction in cost, and products using the transformer can be small in size. The transformer includes a bobbin composed of one primary winding section having one input terminal and one ground terminal and 2n (n: positive number) secondary winding sections, each secondary winding section having two output terminals; a primary coil wound around the primary winding section; secondary coils wound around the 2n secondary winding sections; and a pair of cores that are respectively inserted into an insertion hole formed inside the bobbin.
摘要:
Disclosed is a method of manufacturing a printed circuit board having a landless via hole. Specifically, this invention provides a method of manufacturing a printed circuit board having a landless via hole without the upper land of a via hole using a photoresist (P-LPR) which is loaded in the via hole. Therefore, in this invention, since a circuit pattern is formed using only copper of a copper clad laminate, the width thereof is minimized, thus easily realizing a fine circuit pattern. Further, the landless via hole structure is applied, resulting in a highly dense circuit pattern.
摘要:
Disclosed is an internal antenna apparatus. The internal antenna allows feeding and ground connection to an antenna without power loss or degradation of performance in a structure in which a main printed circuit board is separated from the antenna. The internal antenna apparatus in a mobile communication terminal includes an antenna, a main printed circuit board, and a key pad printed circuit board, the antenna being spaced from the main printed circuit board a predetermined distance. A feeding pad is connected to the antenna, an antenna feeding part is connected between the main printed circuit board and the feeding pad, and a ground connection part connects a ground part of the main printed circuit board to a ground part of the key pad printed circuit board. The antenna feeding part includes a coaxial cable and a cable connection part. The antenna feeding part passes through a battery mounting space between the antenna and the main printed circuit board. The cable connection part is connected to the ground of the key pad printed circuit board. Accordingly, it is possible to prevent the degradation of radiation performance of the antenna.
摘要:
Provided is an optical pickup actuator for writing/reading data in/from an optical storage medium. The optical pickup actuator includes a heat sink member or a heat conductive material for minimizing a bad influence of heat generated from a coil.
摘要:
The present invention relates to vibration-insensitive point-diffraction interferometry. For the purpose of obtaining high immunity to vibration, a single-mode optical fiber is used to generate the reference wave, by means of point diffraction, directly from the measurement wave reflected from test objects. The capability of vibration desensitization is further strengthened by adding a spatial phase-shift devise that enables to obtain four interferograms of different amounts of phase shift simultaneously with no time delay between interferograms. The present invention may be effectively used in the design of measuring systems for in-line applications where measurements need to be performed in the presence of significant level of vibration.
摘要:
Disclosed herein is a vertical light emitting type backlight module, for irradiating white light to the rear side of a liquid crystal display in the perpendicular direction. The vertical light emitting type backlight module comprises a) one or more LED array modules, each comprising a substrate having conductive patterns printed on upper and lower surfaces of the substrate, respectively, a plurality of LED devices mounted on the upper and lower surfaces of the substrate, respectively, for emitting light toward the front of respective surfaces of the substrate with the LED devices mounted thereon, and a plurality of lenses formed to surround the LED devices, respectively, for directing the light emitted from the LED devices in a direction perpendicular to the LED while being within a predetermined angle from an axis parallel to a plane of the backlight module, the substrate being mounted perpendicular to the plane of the backlight module such that the light emitted from the LED devices is emitted in a direction approximately parallel to the plane of the backlight module, and b) a reflection plate for each of the LED array modules for reflecting the light spread in the horizontal direction to change path of the light to the perpendicular direction.
摘要:
The present invention relates to a method of preparing photopolymers using nanoporous membranes. More specifically, the present invention relates to a method of preparing a photopolymer with enhanced optical quality by performing photopolymerization in a polymer having nano-sized pores. The invention also relates to a photopolymer prepared by the method.
摘要:
The present invention relates to a preparation method of solvent-free water-dispersible hydroxypropyl methyl cellulose phthalate nanoparticle, and more particularly, to a preparation method of solvent-free water-dispersible hydroxypropyl methyl cellulose phthalate nanoparticle, which is environment-friendly and advantageous in disintegration and dissolution when used as an enteric coating material, which is prepared by obtaining suitable hydroxypropyl methyl cellulose phthalate (HPMCP) particle through aqueous emulsification process and regulating content of remaining electrolyte through ion exchange process.
摘要:
A command decoder circuit generates command signals for performing internal operations and according to external command signals, according to values of the write latency values and whether write latency is an even numbered or odd-numbered value.
摘要:
A composite part program generator includes a computer-aided design (CAD) system interface, a path generator, a course head manager, a post-processor and a machine simulator. The composite part program generator produces composite part programs for use on a multihead composite material application machine, such as a composite tape lamination machine or an automated fiber placement (AFP) machine, to manufacture a complex composite parts, including relatively flat, contoured, or generally cylindrical composite parts. This programming method can reduce the labor and time required to produce a composite part program for a multihead composite material application machine by an order of magnitude with respect to manual or existing automated programming methods.