Abstract: The present disclosure provides a lens structure and a photographic device. The lens structure includes a lens barrel, a ball assembly, and a sleeve. The ball assembly is disposed on an outer surface of the lens barrel. The sleeve receives the lens barrel and the ball assembly. The sleeve is in rolling contact with the lens barrel via the ball assembly.

Abstract: The present disclosure provides a focusing device and a photographic apparatus. The focusing device includes a lens assembly, a first motor, a second motor, and a motor control board. The lens assembly includes a lens. The first motor and the second motor are respectively disposed on two opposite sides of the lens assembly. The motor control board is fixedly disposed on a side of the lens assembly, and controls the two motors to rotate, such that the first motor and the second motor drive the lens to move.

Abstract: The present disclosure provides a projection apparatus. The projection apparatus includes: a projection body, a rotation platform, wherein the projection body is rotatably connected to the rotation platform; a first drive device, arranged on the projection apparatus and configured to drive the projection body to rotate relative to the rotation platform; a base, wherein the rotation platform is rotatably connected to the base; a second drive device, arranged on the base and configured to drive the rotation platform to rotate relative to the base; and a controller, arranged on the projection apparatus and configured to control the first drive device and the second drive device.

Abstract: The present disclosure provides a projection table. The projection table includes: a table body, including a table plate and defining a receiving space under the table plate; a support and adjustment device, disposed in the receiving space, and configured to support a projector and adjust a position of the projector in the receiving space in at least one direction of a top-and-bottom direction, a back-and-forth direction, and a left-and-right direction; a first mirror, disposed in the receiving space, and configured to receive a light ray emitted from the projector and reflect the light ray; and a second mirror, disposed in the receiving space, and configured to receive the light ray reflected from the first mirror and reflect the light ray out of the receiving space.

Abstract: A method for adjusting a projection picture includes: receiving a first image, captured by a first imaging module, of a position where the projection picture is located, and a second image, captured by a second imaging module, of surroundings of a projection device; identifying, based on the first image, whether a projection shade is present within a projection range of a projecting module; identifying position information of a projection shade in response to the projection shade being present; identifying, based on the second image, movable directions and movable distances of the projection device; and controlling, based on the position information of the projection shade and the movable directions of the projection device and the movable distances in the movable directions, the position adjusting module to adjust the projection device, such that the projection device escapes from the projection shade and a complete projection picture is acquired.

Abstract: Embodiments of the present disclosure relate to a zooming projection method and a projector. The projector includes a focusing device and a lens movable along an optical axis. The method includes: acquiring a projection distance between the projector and a projection position; adjusting the lens to a target position for projection by the focusing device in response to the projection distance being within an optical zooming range; and scaling a projection image and projecting the scaled projection image in response to the projection distance being not within the optical zooming range.

Abstract: The present application discloses a dynamic projection method for target tracking and a dynamic projection device. A dynamic projection method for target tracking includes: acquiring position information of a target; determining three-dimensional spatial coordinates of the target in a first coordinate system based on the position information of the target; determining three-dimensional spatial coordinates of the target in a second coordinate system based on the three-dimensional spatial coordinates of the target in the first coordinate system; determining a deflection angle of a projection screen based on the three-dimensional spatial coordinates of the target in the second coordinate system; determining a rotation angle of a dynamic control unit based on the deflection angle; controlling the dynamic control unit to rotate by the rotation angle; and controlling a projecting unit to project the projection screen. In this way, dynamic projection for target tracking is implemented.

Abstract: A lens module and a projection device are provided. The lens module includes a sleeve, a lens barrel and a locking ring, wherein an end of the sleeve is provided with a deformable conical protrusion; an end of the lens barrel is received in the sleeve through the end of the sleeve; and the locking ring is nested on an outer side of the end of the sleeve, and an inner surface of the locking ring is provided with a conical structure mating with the conical protrusion.

Abstract: Embodiments of the present disclosure, provide a projection image anti-jitter method and apparatus, and a projector. With the projection image anti-jitter method, jitter data of a projection lens is captured; jitter characteristic information and offset data are acquired by calculation; and the projection image is adjusted based on the offset data.

Abstract: Embodiments of the present disclosure relate to a projection method based on augmented reality technology, and a projection equipment (10). In the projection method applicable to the projection equipment (10) includes, the image information of a real space (20) is captured in advance, the 3D virtual spatial model is constructed based on the image information, the optimal projection region is determined based on the 3D virtual spatial model, and a projection target (30) is projected to the optimal projection region. In this way, seamless integration of information about real world and virtual world is achieved, a user does not need to wear a complicated wearable equipment, and user experience is improved.

Abstract: The present disclosure relates to the technical field of digital projection and display, and in particular, relates to a method for controlling a focusing assembly. The focusing assembly includes a lens module, a motor, a bevel retaining piece, and a photoelectric switch. The photoelectric switch includes an optical transmitter and an optical receiver that are oppositely disposed, the motor is connected to the lens module. The method includes: receiving a current voltage signal from the photoelectric switch; determining a current position of the lens module based on the current voltage signal; controlling the motor to stop driving the lens module in response to the current position of the lens module being the predetermined position.

Abstract: Provided is an LED Screen, comprising a box frame and a display unit fixed in the box frame, wherein the display unit comprises a PCB board and a plurality of LED lamp beads fixed on the PCB board, the front and back of the display unit are covered with transparent waterproof membranes, which can play a waterproof role and avoid short circuit of the display unit; Waterproof membranes can also play a role in protecting the LED lamp beads and PCB board, preventing external objects from damaging the beads, and the PCB board from being corroded. Transparent waterproof membrane is easier for the light emitted from LED Lamp beads to pass through, so the PCB board installed with LED lamp beads and covered with waterproof membranes can be directly fixed on the box frame, and can be used, the PCB board can be directly maintained, which is simple and convenient.

Abstract: Embodiments of the present disclosure, relating to the technical field of projection, provides a projection device. The projection device includes: an imaging module, configured to project images; a position adjustment module, connected to the projection module, and configured to adjust a position of the projection module; a controller, connected to the projection module and the position adjustment module, and configured to control the projection module to project images, and control the position adjustment module to adjust the position of the projection module.

Abstract: Embodiments of the present disclosure provide a projector and a projection system. In the projector, a projection light source, a polarizing beam splitting prism, and a projection lens are disposed in a first direction, and the polarizing beam splitting prism is disposed between the projection light source and the projection lens; a polarized light converting component, the polarizing beam splitting prism, and an LCOS imaging chip are disposed in a second direction, and the polarizing beam splitting prism is disposed between the polarized light converting component and the LCOS imaging chip, wherein the second direction is perpendicular to the first direction.

Abstract: The present disclosure relates to the technical field of digital projection display, and discloses a projection method and a projection apparatus. The method includes: acquiring a target object image; identifying attribute information of a target object based on the target object image; acquiring preset projection content based on the attribute information of the target object; acquiring a projection path; and projecting a projection screen based on the preset projection content and controlling the projection screen to move along the projection path. In this way, the projection is more flexible and more pertinent.

Abstract: A projection lens includes a DMD chip, an equivalent prism, a vibrating mirror, a first refractive lens group, a diaphragm, and a second refractive lens group that are successively arranged. The first refractive lens group includes a first lens, a triple-cemented lens, and a fifth lens that are successively arranged. The triple-cemented lens includes a second lens, a third lens, and a fourth lens, and the fourth lens is an aspherical lens.

Abstract: The embodiments of the present disclosure, relating the technical field of projection display, provide a projection apparatus. A projection apparatus includes a projection unit, configured to project a projection image; a support frame, one end of the support frame being fixed to the projection unit; a regulation unit, suspended at the other end of the support frame; and a reflection unit, fixed to the regulation unit, and configured to reflect the projection image. A reflection direction of the reflection unit is regulated by regulating a rotation angle of the reflection unit, such that the reflection unit reflects the projection image to a target projection position.

Abstract: A projection lens includes a display chip, an equivalent flat lens, a first refractive lens group, a diaphragm, and a second refractive lens group that are successively arranged; wherein the first refractive lens group includes a first lens and a double-cemented lens that are successively arranged, wherein the double-cemented lens includes a second lens and a third lens. A total length of the projection lens is less than 32 mm, an angle of view of the projection lens is 65 degrees, and a depth of field of the projection lens at a projection distance of 400 mm reaches ±170 mm.

Abstract: Embodiments of the present disclosure relate to the technical field of projection, and provide a double telecentric projection lens and a projection system. The double telecentric projection lens includes a first lens group, an aperture stop, and a second lens group that are successively arranged from an object side to an image side, a center of the aperture stop being at a rear focus of the first lens group and a front focus of the second lens group; wherein a focal power of the double telecentric projection lens is greater than 0.03, an object-side numerical aperture of the double telecentric projection lens is 1.7, and an image-side numerical aperture of the double telecentric projection lens is 5.95.

Abstract: This application provides a data distribution method includes: A network device buffers first data, where the first data is data of a service that is provided by a server for a first terminal device; the network device receives N first data requests sent by N second terminal devices; and when data requested by the N first data requests is data provided by the server based on the service, the network device intercepts the N first data requests and sends the buffered first data to the N second terminal devices. This can reduce a plurality of connections that are used to transmit data of a same service and that exist on a channel between the server and the network device, thereby occupying a smaller downlink bandwidth to transmit the data of the same service from the server to the network device.