33 results about "Dual focus" patented technology

The present invention relates to a dual focusing optical coherence imaging system. The dual focusing optical coherence imaging system includes: a light source unit for generating broadband light; a main optical distributor for distributing the light generated from the light source to allow the light to be propagated; an interference unit including first and second interference parts for forming interference signals with respect to different focused areas of an object to be detected using the light distributed from the optical distributor, and a common sample arm commonly connected to the first and second interference parts; an optical switch connected to the first and second interference parts to select at least one of the interference signals transmitted from the first and second interference parts; and a detection unit for converting the interference signal selected by the optical switch according to a preset mode into an electrical signal.

A dual field-of-view optical imaging system is provided for obtaining two images of a scene, each image having a different field of view. The dual field-of-view optical imaging system includes a frontal dual focus lens, the dual focus lens having a central zone of focal length f₁ producing a wide field-of-view image at a first focal plane and a peripheral zone of focal length f₂ greater than f₁ producing a narrow field-of-view image at a second focal plane; and a detector for detecting and acquiring the wide field-of-view image and the narrow field-of-view image, the detector being movable along an optical path for selective positioning at the first focal plane or the second focal plane.

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.

A dual-focus switchable lens is provided and includes: in order from the object side, a first lens group having a negative refractive power, a second lens group having a positive refractive power and a third lens group having a positive refractive power. The first lens group includes a lens having a negative refractive power and a lens having a positive refractive power in order from the object side, at least one of the lenses being an aspherical lens. The second lens group includes a cemented lens and a single lens having an aspherical surface and having a negative refractive power in order from the object side. The third lens group is a positive lens. Two focal points of the dual-focus switchable lens is switched by moving the second lens group while maintaining the first and third lens groups substantially stationary, and the dual-focus switchable lens satisfies specific conditional expressions.

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.

Methods for laser beam cutting metal workpieces with a thickness between 4 mm and 25 mm. A double focusing lens is provided to make it possible to focus a laser beam on a first focusing and a second focusing point. These points are separate from each other and both lie on the laser's optical axis. The lens has a focal length between 170 mm and 300 mm.

The invention discloses a magnetic deflection mass spectrometer based on a cylindrical electric field analyzer, and belongs to the technical field of instruments. The magnetic deflection mass spectrometer mainly comprises an ion source, a first slit, a cylindrical electric field analyzer, a second slit, a magnetic field analyzer and an ion flow detector; wherein, the cylindrical electric field analyzer and the magnetic field analyzer are connected in a reversed series connection; the magnetic deflection mass spectrometer ensures mutual offset of energy dispersion generated by magnetic fields and electric fields, so that the magnetic deflection mass spectrometer has dual focusing capability of energy and direction, and distinguishing ability is substantially improved.