33results about How to "Narrow field of view" patented technology

A positioning system in an optical card reading apparatus, for accurately positioning the optical card (801) relative to the probe array (102) used to read the data stored on the card. The card (801) is provided with a pattern of servo bands (800) and the sensor (103) used to read out data stored on the optical card (801) has a windowing function which is used to narrow its field of view (802) to define a region of interest (900) corresponding to one or the servo bands (800), and the output is fed to an analogue-to-digital converter. Thus, the “windowing” function of the sensor (103) is used to increase the readout speed and, therefore, the speed of detection of servo marks (800) to enable more rapid positioning of the probe array (102) relative to the optical card (801).

Methods and apparatus for combining or separating spectral components by means of a polychromat. A polychromat is employed to combine a plurality of beams, each derived from a separate source, into a single output beam, thereby providing for definition of one or more of the intensity, color, color uniformity, divergence angle, degree of collimation, polarization, focus, or beam waist of the output beam. The combination of sources and polychromat may serve as an enhanced-privacy display and to multiplex signals of multiple spectral components. In other embodiments of the invention, a polychromat serves to disperse spectral components for spectroscopic or de-multiplexing applications.

The present invention discloses a full parallax three-dimensional display device. It comprises a projector array and an orthogonal cylinder raster screen. The orthogonal cylinder raster screen comprises the first cylinder raster and the second cylinder raster. The projector array and the orthogonal cylinder raster screen are put in order. The projector array projects images on the orthogonal cylinder raster screen. The raster directions of the first cylinder raster and the second cylinder raster of the orthogonal cylinder raster screen are parallel to the x-axis and the y-axis, respectively. The advantage of the present invention is that it can generate 3D images of high image resolution and high view-field resolution. The extremely tiny view field intervals can bring completely continuous and jumping-free 3D perception for the viewer, reduce the fatigue caused by discontinuous view field in conventional 3D display, and achieve full parallax 3D display including horizontal parallax and vertical parallax.

An optical imaging system includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens sequentially disposed on an optical axis from an object side toward an image side. A distance from an object-side surface of the first lens to an imaging plane of an image sensor is TTL, an overall focal length of an optical system including the first to sixth lenses is F, and TTL/F≤0.83. An optical axis distance between the second lens and the third lens is D23, an optical axis distance between the third lens and the fourth lens is D34, and 2.2<D23/D34<5.4.

An apochromatic imaging system has an object-side lens group having at least an object-side lens element with positive refractive power and formed from a flint glass material with deviation of relative dispersion −0.013<ΔP_g,F<+0.013 and an Abbe number less than 50. A middle lens group has at least a second lens element and a third lens element, wherein, one of the second and third lens elements has deviation of relative dispersion −0.013<ΔP_g,F<0.013 and the other of the second and third lens elements has deviation of relative dispersion 0.013<ΔP_g,F<0.04. An image-side lens group has at least a fourth lens element.

An apparatus and system for a display screen for use in near-eye display devices. Small light emitting devices are placed behind a plurality of light-directing beads. The light emitting devices and light-directing beads for a display device and system placed in front of a user for near-eye display. This allows a user to experience near-eye display with greater resolution, wider field of view and faster frame rate. Other embodiments are described herein.

The invention provides a stable and efficient single spore isolation method for plasmodiophora brassicae woronin serving as a protist with strong parasitism. The stable and efficient single spore isolation method comprises the following steps of: preparing a relatively pure spore suspension by using an improved sucrose gradient centrifugation method, calculating the concentration of the spore suspension by using a blood counting chamber, on the basis of the spore suspension with a certain concentration, obtaining single-dormancy spores by using an agar block planar capillary imprinting method,and then inoculating the single-dormancy spores to robust root hairs of the susceptible variety ECD-05 in an ECD system for accelerating germination for 2-3 days. Compared with previous related research methods, the method disclosed by the invention mainly overcomes the problems that: single spores are tiny and not easy to position under a microscope; the visual field of a liquid droplet method is layered too much; furthermore, the single spores are easy to dry and cannot be absorbed; the single spores cannot be accurately picked through micromanipulation and the like. The combination of theplanar capillary imprinting method can greatly reduce the visual field range needing to be inspected during microscopic examination; furthermore, the blocked agar is easy to grab; in addition, advanced automatic instruments and equipment are not needed; the operability is high; and the single spore isolation efficiency can be remarkably improved.