摘要:
A piezoelectric ceramic composition in which the dielectric constant, the mechanical quality factor Qm and the electromechanical coupling factor Kp are superior, and a high power output piezoelectric transformer made of it are disclosed. The piezoelectric ceramic composition according to the present invention is composed of Pb[(Sb1/2Nb1/2)x(Zr0.495Ti0.505)1−x]O3+yPbO+zMnO, where x is 0.01-0.05 mol %, y is 0.03-0.6 wt %, and z is 0.7 wt % or less. The piezoelectric transformer according to the present invention includes: a piezoelectric block composed of the same composition; a first electrode consists of an inner electrode and an outer electrode, the inner electrode being formed at the center of the top of the piezoelectric block, and the outer electrode being formed around the inner electrode by being separated by an isolating region; and a second electrode is formed on the bottom of the piezoelectric block.
摘要:
A bias current for an integrated circuit is generated by generating a first bias current that increases with temperature, generating a second bias current that decreases with temperature, and summing the first bias current and the second bias current. Summing may take place by mirroring the first bias current, mirroring the second bias current and summing the mirrored first bias current and the mirrored second bias current. Pull-down circuits also are preferably provided for the circuits that generate the first and second bias currents. The pull-down circuits are responsive to a pulse signal. The pulse signal may be generated from a power-down signal or another signal. Accordingly, bias current generating circuits and methods can have reduced susceptibility to changes in temperature, changes in power supply voltage and/or process variations, and can rapidly produce the bias current.
摘要:
The present invention relates to a structure of an edge-type back light unit, particularly to a structure comprising a light source receiving part, which receives a light source such as LED formed to the central direction of an optical plate at one side or the other side of the optical plate.The present invention has excellent optical property and has an effect of wide application to various LCDs because it comprises a light source receiving part, which can install a printed circuit board mounting the light source such as LED to an embedded form in an edge-type back light unit.
摘要:
A light unit is provided. The light unit includes a PCB mounted with a plurality of LEDs, and a light guide member having a plurality of reception grooves piercing therethrough and receiving the LEDs, wherein the light guide member includes one surface and the other surface opposite to the one surface, and the one surface of the light guide member is further coated with the resin material. The reception grooves are formed in the light guide member and are filled with a fluid resin material, thus preventing the damage to the LED caused by the difference between the thermal expansion rates of the components such as the light guide member, the reflection film and the PCB.
摘要:
A subject detecting method and a subject detecting apparatus, by which face detection may be efficiently performed in a digital photographing apparatus having a flippable display unit, and when an image input via an image sensor of the digital photographing apparatus is different from an image displayed on the display unit due to rotation of the digital photographing apparatus, a face detection coordinate may be corrected to increase the reliability of face detection.
摘要:
The present invention relates to a method of manufacturing soil reinforced by microbe-based bio-binders and soil produced by the method. The bio-binders are not harmful to humans, do not cause environmental pollution and secure sufficiently the soil strength and resistance against wind. According to the method, the soil is prepared by binding sand whose major components are silica and alumina, ureolytic microbes, urea, calcium ion, and polymer fibers, and the content of polymer fibers in sand ranges from 0.05 wt % to 5 wt %. In addition, it is preferable that the microbes provide CaCO3 at a rate at 1˜7×10−9 g CaCO3 ppt cell−1 hr−1 under optimum conditions.
摘要:
The present invention relates to a capacitive touch sensor, and relates to a touch sensor which precisely senses whether there is any touch, without using a reference voltage or reference current in the touch sensor but by converting data between neighboring channels into two types of data having different polarities and by comparing the same. The invention makes it possible to miniaturize a structure of the touch sensor and to ensure compatibility allowing application to a variety of touch panels by minimizing the influence of noise from the outside environment. More specifically, the present invention provides a capacitive touch sensor comprising: at least one receiver channel RX which outputs analog data of a voltage for change in capacitance caused by presence or absence of a transmitter channel TX pulse impression and touch; at least one receiver unit which is connected to the receiver channel RX, receives the analog data of the voltage, and outputs bipolar pulse width modulation signals; a counter which periodically operates in accordance with reset RST signals; and at least one flip-flop which outputs, as digital data, the bipolar pulse width modulation signals input from the receiver unit, by using count values received from the counter.
摘要:
Disclosed is a backlight unit. The backlight unit includes a printed circuit board formed thereon with a plurality of LEDs and a light guide member having receiving holes to receive the LEDs. At least one round part having a predetermined curvature is formed at an edge defined in an intersection between an upper surface and an inner surface of the receiving hole. Since the round part is formed at the edge in the receiving hole receiving the LED at the portion of the light guide member, the light distribution is improved so that the light efficiency is increased.
摘要:
A digital image capturing device detecting a face in an input image and providing a photographing composition, and a method using the digital image capturing device are provided. An embodiment of the digital image capturing device includes: a face detecting unit for detecting a face in the input image; an extracting unit for extracting tilt information of the detected face and a gaze direction; an establishing unit for establishing a photographing composition according to the tilt information or gaze direction of the face; and a providing unit for providing a change of the photographing composition according to the established photographing composition.
摘要:
There is provided a variable switching frequency type power supply that can achieve high efficiency by fixing a switching duty cycle to 50% and varying switching frequency. A variable switching frequency type power supply according to an aspect of the invention may include: a switching unit switching input power; a transformation unit converting a voltage level of the power switched by the switching unit into a predetermined voltage level; a rectification unit rectifying the power converted by the transformation unit; and a control unit fixing a switching duty cycle of the switching unit to a predetermined switching duty cycle, and varying switching frequency of the switching unit according to a voltage level of output power.