33 results about "Dual focus" patented technology

The invention discloses a dual focusing beam forming method and device based on virtual array elements. The method comprises the following steps of: performing primary focusing by using a single fixed focus; calculating a delay parameter of secondary focusing by using the concept of the virtual array elements; and performing secondary focusing according to the principle of delay-and-sum (DAS) beam forming and the dynamic focusing technology to acquire finally imaged scanning line data. Dual focusing beam forming ultrasonic imaging is realized by introducing the virtual array element technology to an ultrasonic imaging system, using a DAS beam synthesis method and performing DAS twice. The method is characterized in that related valid information of a plurality of superposed sound fields is extracted by performing DAS twice, so that information quantity and energy of sound wave signals are increased, and the imaging effect is greatly improved. According to the method, two beam formers BF1 and BF2 and a first in first outlet (FIFO) buffer are used and DAS is performed twice, so that a large quantity of low-resolution echo data is not required to be stored.

The invention relates to a sunlight full-light guidance lighting system, which comprises a dual-focus full-light collection device. The dual-focus full light collection device comprises an annular parahboloidal mirror, a spherical concave mirror and a full-light light guide pipe; sunlight is reflected and focused by the annular parahboloidal mirror and reflected again by the concave mirror and enters the full-light light guide pipe; and the full-light light guide pipe comprises a glass tube, a reflecting mirror film arranged on the outer wall of the glass tube, and a plastic sleeve in close fit with the outer periphery of the reflecting mirror film. The sunlight full-light guidance lighting system has the advantages of low manufacturing cost and flexible installation, can be conveniently independently installed or combined into a movable type, a wall mounting type, an eave mounting type and an overhead mounting type according to different requirements for lighting, sunshine and lighting of application places, is particularly suitable for high-power and high-energy level light density sunlight lighting systems in different fields such as civil, public and underground projects, industry, agriculture, planting and breeding.

The system and the method of the present invention differ from the prior art in that radii of curvature of any length of spherical and cylindrical test surfaces can be optically measured, with only a supplementary dual-focus lens being required in addition to an interferometer or an autocollimator. The supplementary dual-focus lens has a first focal plane, into which the surface vertex of the test surface is positioned, which establishes the cat's eye position (P(cat)), and a second focal plane into which the center of curvature of the test surface is moved, which establishes the autocollimation position (P(aut)) for the test surface. The radius of curvature of the test surface is determined from the distance between the focal planes (D(foc)) and the path of movement which can be reduced to zero.

The invention discloses a dual-focusing fine tracking lens comprising a lens focusing motor assembly (16), a primary mirror group (1) and a secondary mirror focusing assembly (2). The secondary mirrorfocusing assembly (2) comprises a second secondary mirror connection seat (215), a piezoelectric ceramic component, and a secondary mirror (201) fixed to the second secondary mirror connection seat (215). The piezoelectric ceramic component and the second secondary mirror connection seat (215) are connected to each other. The lens focusing motor assembly (16) includes a lens tube (1601) having afront group lens (4) therein, a focusing lens tube (1602), a long positioning screw (1605) connecting and fixing the lens tube (1601) and the focusing lens tube (1602), and a focusing motor (1608). Afocusing curve groove and a focusing gear meshed with the focusing motor (1608) are disposed on the focusing lens tube (1602). The dual-focusing fine tracking lens of the invention focuses the secondary mirror and the front group lens and achieves high-quality imaging.

A monolithically integrated CMOS image sensor with double focal micro-lens array comprises a standard CMOS logic circuit integrating a photodiode of silicon pin, a micro-lens array integrated on an optical absorption surface corresponding to an active region of the CMOS circuit, a silicon nitride layer covering the micro-lens array, a color filter arranged on the silicon nitride layer. The invention is characterized in that the micro-lens array, which is a double focal micro-lens array, is monolithically integrated with the CMOS circuit, and with a 1.44-2.0 refractive index, the micro-lens array is applied on a good optical focusing double focal micro-lens array to improve light collection efficiency and quantum efficiency.

The invention belongs to the technical field of medical instruments, and comprises the design methods of a refractive multi-focus intraocular lens and a diffractive multi-focus intraocular lens. During designing the refractive multi-focus intraocular lens based on the eye model, a dual-spherical intraocular lens is designed firstly; then, one surface of the intraocular lens is divided into a plurality of optical areas along the radial direction; and the curvature radius of each optical area on the surface of the intraocular lens is directly optimized by Zemax optical design software to make the light of the optical area for distant vision focused on the retina when the object distance is infinite or to make the light of the optical area for near vision focused on the retina when the object distance is the reading distance (33 cm). During designing the diffractive multi-focus intraocular lens based on the eye model, a dual-spherical intraocular lens is designed firstly to achieve the degree of myopia of 1.5D; then, a binary surface is introduced on one surface of the intraocular lens; and the phase coefficients of the binary surface are optimized directly to make the (-1)-order diffraction focus focused on the retina when the object distance is infinite or to make the (+1)-order diffraction focus focused on the retina when the object distance is the reading distance.