Abstract: A freeform surface off-axial three-mirror imaging system comprising a primary mirror, a secondary mirror, a tertiary mirror, and a detector. The secondary mirror comprises a first freeform surface and a second freeform surface. Each reflective surface of the primary mirror, the first freeform surface, the second freeform surface and the tertiary mirror is an xy polynomial freeform surface. The freeform surface off-axial three-mirror imaging system comprises a first effective focal length and a second effective focal length different from the first effective focal length.

Abstract: A freeform surface off-axial three-mirror imaging system comprising a primary mirror, a secondary mirror, a tertiary mirror, and a detector. The secondary mirror comprises a first freeform surface and a second freeform surface. Each reflective surface of the primary mirror, the first freeform surface, the second freeform surface and the tertiary mirror is an xy polynomial freeform surface. The freeform surface off-axial three-mirror imaging system comprises a first field of view formed by the first freeform surface and a second field of view formed by the second freeform surface.

Abstract: A freeform surface off-axial three-mirror imaging system comprising a primary mirror, a secondary mirror, a tertiary mirror, and a detector. The secondary mirror defines a first location and a second location. Each reflective surface of the primary mirror, the secondary mirror and the tertiary mirror is an xy polynomial freeform surface. A working distance of the freeform surface off-axial three-mirror imaging system is greater than 125 mm.

Abstract: A method of designing an freeform surface off-axial three-mirror imaging system is provided. The method includes: establishing an initial system and T (T?2) object-image relationships according to a design goal, and selecting M feature fields for each object-image relationship; using feature rays of the T object-image relationships to construct a freeform surface system by using the initial system; step (S3), the freeform surface system obtained in step (S2) is used as another initial system, using iterative process to reduce a deviation between actual intersection points and ideal target points of the feature rays and feature surfaces, iteratively reconstructing free-form surfaces in the free-form surface system.

Abstract: An armrest storage box assembly has an armrest box body comprising a first storage space having a first opening, and an armrest connected to the armrest box body, the armrest moving between a first closed position and a first open position to open and close the first opening. The armrest comprises an armrest body, comprising a second storage space having a second opening, and a cover connected to the armrest body, the cover moving between a second closed position at which the second opening is closed and a second open position at which the second opening is opened to open and close the second opening.

Abstract: A point-by-point design method for off-axis aspheric optical system, in which feature light rays from different field angles and aperture coordinates are considered. Some of the feature data points are calculated first and surface fitted into an initial aspheric surface. Then, intermediate point calculations, feature data point calculations, and aspheric surface fitting were repeated continuously to calculate remaining feature data points and the desired aspheric surface are repeated continuously to calculate remaining feature data points and a desired aspheric surface. A least-squares method with a local search algorithm is used for aspheric surface fitting and deviations in both the coordinates and normals are used to reduce error.

Abstract: An off-axis hybrid surface three-mirror optical system comprises a primary mirror, a secondary mirror, a tertiary mirror, and an image sensor. A reflective surface of the primary mirror is a sixth-order polynomial freeform surface of xy. A reflective surface of the secondary mirror is a sixth-order polynomial aspheric surface of xy. A reflective surface of the a tertiary mirror is a spherical surface of xy.

Abstract: Embodiments of this application disclose a method for scheduling a terminal. The method includes the following operations: receiving a precoding matrix indication PMI value and reference signal received power RSRP that are sent by user equipment; determining, based on the PMI value, grouping of a network area corresponding to the user equipment; and determining, based on the RSRP, a network area in which the user equipment is located. This application has the advantage of avoiding interference between network areas.

Abstract: The disclosure relates to a method and a device for starting an application program, which are applied to a terminal including a sliding cover and a device body slidable connected with each other. The method includes detecting a first movement of the sliding cover relative to the device body during a running process of a target application program; obtaining a first sliding information of the sliding cover based on the first movement; and starting a first application program when the first sliding information indicates that the sliding cover performed a preset sliding movement.

Abstract: Embodiments of the present invention disclose a method for transmitting base station data. The method includes the following steps: receiving a precoding matrix indication PMI value and reference signal received power RSRP that are sent by user equipment; determining, based on the PMI value, a network area group corresponding to the user equipment; and determining, based on the RSRP, a network area in which the user equipment is located. The present invention has the advantage of avoiding interference between network areas.

Abstract: An illumination system with freeform surface comprises a plurality of collimated light sources having same parameters and a freeform surface lens comprising a first freeform surface and a second freeform surface, wherein formula of the first freeform surface and the second freeform surface is expressed as follows: z = c ? ( x 2 + y ? ? 2 ) 1 + 1 - ( 1 + k ) ? c 2 ? ( x 2 + y 2 ) + ? m ? ? n ? A mn ? x m ? y n , in which c is the curvature of the conic surface at the vertex, k is the conic constant, Amn represents the xy polynomials coefficient, m+n?2 and both m and n are even, beams emitted by the plurality of collimated light sources pass through the freeform surface lens to form a plurality of light spots on a target plane.

Abstract: A terminal device, a method for activating or controlling a predetermine function of the terminal, and a computer readable storage medium encoding the method include receiving a first touch instruction applied to a first predetermined area of a display screen of the terminal; and activating the predetermined function of the terminal in response to reception of the first touch instruction when the terminal is in a preset mode of operation and preset mode is in a display state. When a terminal is configured with the control or activation method, a user only has to apply a first touch instruction to a first preset area of a display screen of the terminal to activate the predetermined function when the terminal is in a preset mode of operation.

Abstract: A method for designing an off-axis three-mirror imaging system with freeform surfaces is provided. A primary mirror initial structure, a secondary mirror initial structure, and a tertiary mirror initial structure are established. A number of first feature rays are selected, while the primary mirror initial structure and the secondary mirror initial structure unchanged. The first feature rays are forward ray tracked from an object space to an image detector. A number of first feature data points are calculated to obtain a tertiary mirror. A number of fields and a number of second feature rays are selected, while the secondary mirror initial structure and the tertiary mirror unchanged. The second feature rays are reverse ray tracked from the image detector to the object space. A number of second feature data points are calculated to obtain the primary mirror.

Abstract: A method for designing off-axial three-mirror optical system with freeform surfaces is provided. A first initial surface, a second initial surface, and a third initial surface are established. A plurality of feature rays are selected, while the first initial surface and the third initial surface remain unchanged; a plurality of first feature data points are calculated to obtain a third freeform surface equation by surface fitting the plurality of first feature data points. A third freeform surface and the second initial surface are remained unchanged; a plurality of second feature data points are calculated to obtain a first freeform surface equation by surface fitting the plurality of second feature data points. The third freeform surface and a first freeform surface are remained unchanged; a plurality of third feature data points are calculated to obtain a second freeform surface equation by surface fitting the plurality of third feature data points.

Abstract: A freeform surface off-axial three-mirror image-side telecentric optical system comprises a primary mirror, a secondary mirror, a tertiary mirror and an image sensor. The secondary mirror is the aperture stop. A reflective surface of the primary mirror is a fourth-order polynomial freeform surface of xy. Each of a reflective surface of the secondary mirror and a reflective surface of the tertiary mirror is a sixth-order polynomial freeform surface of xy.

Abstract: A light intensity distribution comprises a carbon nanotube array located on a surface of a substrate, a reflector, an imaging element and a cooling device. The carbon nanotube array absorbs photons from a light source and radiates a visible light. The reflector reflects the visible light and is spaced from the carbon nanotube array. The imaging element images the visible light reflected by the reflector. The cooling device is used to cool the substrate to make a contact surface between the substrate and the carbon nanotube array maintain a constant temperature. The cooling device is located between the substrate and the imaging device. The imaging device is spaced from the cooling device.

Abstract: A oblique camera lens includes: a primary mirror configured to reflect a light ray to form a first reflected light; a secondary mirror located on a first path of light reflected from the primary mirror and configured to reflect the first reflected light to form a second reflected light; a tertiary mirror located on a second path of light reflected from the secondary mirror and configured to reflect the second reflected light to form a third reflected light; and an image sensor located on a third path of light reflected from the tertiary mirror and configured to receive the third reflected light; wherein each of the first reflecting surface and the third reflecting surface is a sixth order xy polynomial freeform surface; and a field of view of oblique camera lens in an Y-axis direction is greater or equal to 35° and less than or equal to 65°.

Abstract: A method for designing freeform surface is provided. An initial surface is established. A plurality of feature rays are selected. A plurality of intersections of the plurality of feature rays with an unknown freeform surface are calculated based on a given object-image relationship and a vector form of the Snell's law. The plurality of intersections are a plurality of feature data points. An unknown freeform surface equation is obtained by surface fitting the plurality of feature data points.

Abstract: A freeform surface imaging spectrometer system including a primary mirror, a secondary mirror, a tertiary mirror, and a detector is provided. The secondary mirror is a grating having a freeform surface shape, and the grating having the freeform surface shape is obtained by intersecting a set of equally spaced parallel planes with a freeform surface. A plurality of feature rays exiting from a light source is successively reflected by the primary mirror, the secondary mirror and the tertiary mirror to form an image on an image sensor. A reflective surface of each of the primary mirror, the tertiary mirror surface and the tertiary mirror is an xy polynomial freeform surface.

Abstract: A method of designing a freeform surface optical system with dispersion elements is provided. A nondispersive spherical optical system comprising a nondispersive sphere is constructed. A dispersion element is placed on the nondispersive sphere to construct a dispersive spherical optical system comprising a dispersive sphere. The dispersive spherical optical system is constructed into a dispersive freeform surface optical system comprising a freeform surface. The coordinates of the feature data points on the freeform surface are kept unchanged, and the normal vectors are recalculated. The coordinates and new normal vectors are fitted to obtain a new freeform surface. An iterative algorithm is performed until all freeform surfaces are recalculated to new freeform surfaces.