35results about How to "Avoid multiple reflections" patented technology

An ultrasonic array probe is fixed to a rotational shaft at a predetermined angle, and thus a mechanical structure is made simple. An ultrasonic beam is electronically controlled so that an ultrasonic transmission/reception direction may become substantially perpendicular to the surface of the mamma. Thereby, data on the entire mamma including a C′ region can be collected only by the rotation of the probe. In addition, a membrane which is interposed between the probe and the mamma is formed to have a mesh-like structure, thereby reducing multiple reflection. Moreover, a B mode image and a C mode image are displayed at the same time, and thereby an accurate diagnosis can be performed in a short time.

An OCT probe has a sheath to be inserted into a subject; and an optical system within the sheath, for changing the direction of light which propagates from a light source through an optical fiber to irradiate the light onto the subject through a transparent portion of the sheath, and for reflecting the light beam, which is reflected by the subject, to guide the light into the optical fiber. A light output surface, for causing the light to be output from the reflecting surface in a direction obliquely inclined with respect to the inner surface of the sheath, and a reflected light sheath entrance preventing portion, for preventing light reflected by the inner surface of the sheath from entering the optical fiber, are provided in the optical system. The reflected light sheath entrance preventing portion may be formed by providing a cut planar surface portion on the lens.

The invention relates to a switch apparatus back-arc medium recovery strength nanosecond continuous pulse measuring device and a method thereof. A high-voltage electronic switch mode is adopted for controlling high-voltage pulse, and the electronic switch has the following advantages: the formed nanosecond pulse is simple and stable; the impedance is high under open-circuit condition; and the electronic switch can work under a repeated frequency mode. A designed pulse forming circuit can adjust the form of the pulse, the way of adding a matched resistance at the transmission end of the high-voltage pulse can prevent multiple reflections of the pulse, a designed capacitive voltage divider meets the need for high frequency measurement, and a peak holding circuit can record measurement requirements of high frequency continuous pulse. By adopting the experimental method, the time resolution of pulse experimental measuring medium recovery strength can also be improved, the observation accuracy of back-arc medium recovery physical process can be improved, and the quantitative analysis of time characteristic of breakdown development can be conducted. Simultaneously, due to the application of the continuous pulse, the consistency of experiment is further guaranteed, the experimental efficiency is improved, and the experimental cost is reduced.

A device including a receiving antenna on a circuit board and a radome, multiple reflections of the received signals between the radome and the receiving antenna being avoided by using a polarization-rotating structure on the circuit board. The device may in particular be an integral part of a distance controller for adaptive cruise control of a motor vehicle.

A method for producing a solid-state imaging device, which including: a photoelectric conversion section; a charge transfer section having a charge transfer electrode; and an antireflection film covering a light-receiving region in the photoelectric conversion section, wherein forming the antireflection film includes: forming a sidewall on a lateral wall of the charge transfer electrode after forming the charge transfer electrode; forming an antireflection film on a substrate surface where the sidewall is formed; forming a resist on the antireflection film; melting and flattening the resist to expose the antireflection film on the charge transfer electrode; removing the antireflection film by using the resist as the mask; removing the sidewall; covering the charge transfer electrode with an insulating film; and forming a light-shielding film that reaches a level lower than the top surface of the antireflection film, and that surrounds the periphery of the antireflection film.

The invention provides a high beam for an automobile. The high beam for the automobile comprises a light source body, a light reflecting bowl, a light shading device and a light refracting device; the light source body is arranged at the bottom center of the light reflecting bowl; the light shading device comprises a reflector and a support fixing the reflector into the light reflecting bowl; the light refracting device comprises a light refracting unit arranged on the inner wall of the light reflecting bowl; and the light refracting unit comprises a horizontal refracting sheet and an inclined refracting sheet. The high beam for the automobile is simple in structure and practical in function, avoids harm to the eyes of a head-on driver, solves the problems that because the high beam is used mistakenly, the driver on the opposite side becomes blind instantly and transiently and then traffic accidents may happen, and has application and popularization value.

The invention relates to a reflector for an area light source with emergent surface area of at least 10mm<2>, which belongs to the technical field of illuminating lamps. The reflector is characterized by being bowl shaped inverted on a plane and comprises a central part as a bowl bottom and a side part as a bowl side; the central part is formed in such a way that a curve rotates along a central shaft of the bowl; the reflected light forms illumination distribution with central rotational symmetry on a target plane; the side part comprises a three-dimensional free continuous curve surface and can be also formed by discontinuously splicing the three-dimensional free strip curve surfaces; each strip curve surface is independent and continuous; and light distribution formed by the side part, light distribution formed by the central part and the distribution of light which is emitted by the area light source and directly formed without the processing of the reflector are superposed for compensation so as to realize any given light distribution. The invention has the advantages of high luminous efficiency, flexible light distribution and less invalid light.

This invention is directed to a new class of nonlinear optical device (NLO). For this purpose, in one aspect of this invention, a nonlinear optical device including a first nonlinear optical grating is presented. According to one version of the invention, the first nonlinear optical grating comprises a plurality of adjacent nonlinear optical units arranged in series. Each NLO unit has a single crystal segment and a polycrystalline segment. The single crystal segment is composed of a nonlinear optical crystal material and has its length adapted to provide the nonlinear optical effect. The polycrystalline segments are adapted in length to compensate the phase mismatch among the waves that occur in the single crystal segment.

The invention discloses a terahertz light guide antenna space power synthesizer. The terahertz light guide antenna space power synthesizer comprises a femtosecond laser, a reflecting mirror, a 1/2 wave plate, a beam splitter, a precise displacement platform, a displacement platform controller, a polarizing film, a focusing lens, a photoconduction antenna, a terahertz lens, a zinc telluride electro-optical crystal, a 1/4 wave plate, a Wollaston prism, a photoelectric balance detector, a phase-locked amplifier, a high-voltage modulator and a data acquisition and processing system. The device can keep an ultra wide band of terahertz waves radiated by the photoconduction antenna, obtain terahertz waves higher than waves of a single photoconduction antenna in power and achieve power synthesis of terahertz waves radiated in a certain spatial point of two or more photoconduction antennae.

The invention discloses a ventilation device for a temperature sensor array, and belongs to the technical field of meteorological instruments. The device comprises a plurality of supporting columns which are parallel to one another, and the supporting columns are vertically arranged; a reflecting plate I and a reflecting plate II are respectively fixed at the head and tail ends of the plurality of supporting columns; a plurality of flow guide structures are arranged outside the whole supporting column in a sleeving manner in the length direction of the supporting column; the flow guide structure comprises two flow guide plates, each flow guide plate is in a convex circular truncated cone shape with an upper opening and a lower opening, and the two flow guide plates are symmetrically arranged; a flow guide opening is formed between the two flow guide discs, and the caliber of the flow guide opening is gradually increased from inside to outside. The drainage disc can guide airflow to enter the ventilation channel, so that the speeds of internal airflow and external airflow are basically consistent, and low-angle solar radiation in the morning and evening can be blocked.