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RU-2803925-C1 - LASER BEACON FOR VIRTUAL REALITY SYSTEMS WITH 360 DEGREE SCANNING OF ENVIRONMENT

RU2803925C1RU 2803925 C1RU2803925 C1RU 2803925C1RU-2803925-C1

Abstract

FIELD: tracking location of objects. SUBSTANCE: laser beacon for virtual reality systems with 360-degree scanning of the surrounding space consists of a chassis; mounted on the body of the engine with a hollow rotor, with the help of which a rotating hollow drum in the form of a truncated cone with an angle at the top of the cone 2β, equal to: β = 90° - arctg(tg(α 0 /2)cos(γ)),where α 0 is the full opening angle of the fan-shaped plane, γ is the angle of inclination of the plane of the fan-shaped laser beam to the plane of rotation; two lenticulars mounted on the side wall of the drum, with the help of which laser fan-shaped beams are formed, the planes of which are oriented at different angles to the plane of rotation ±γ; reflecting isosceles prism, which is rigidly mounted on the drum symmetrically to the axis of rotation, while the axis of rotation of the rotor passes through the top of the prism, and the angle at the top of the prism is equal to: θ = 90 - β a laser the radiation of which passes through a collimator; a block for modulating laser radiation and encoding an omnidirectional synchronization pulse; a block for generating an omnidirectional synchronization pulse; rotor speed sensor to determine the moment of emission of an omnidirectional synchronization pulse at the beginning of each scan cycle. EFFECT: provision of 360° space scanning with the possibility of mounting the device on the ceiling and on any surface inaccessible to the operator. 3 cl, 1 dwg

Inventors

  • Tyulin Evgenij Andreevich

Dates

Publication Date
20230922
Application Date
20220830

Claims (12)

  1. 1. Laser beacon for virtual reality systems with 360-degree scanning of the surrounding space, consisting of:
  2. - housings;
  3. - a motor with a hollow rotor installed on the housing, with the help of which a hollow drum in the form of a truncated cone rotates with an angle at the apex of the cone 2β, where
  4. where α 0 is the full opening angle of the fan-shaped plane, γ is the angle of inclination of the plane of the laser fan-shaped beam to the plane of rotation;
  5. - two lenticulars installed on the side wall of the drum, the cylindrical lenses of which are oriented in the same direction and at an angle γ to the plane of rotation;
  6. - a laser, the radiation of which passes through a collimator, with the help of which the laser beam expands and its divergence in space is regulated;
  7. - an isosceles reflective prism, which is rigidly mounted on the engine rotor symmetrically to the axis of rotation, while the axis of rotation of the rotor passes through the top of the prism, and the angle at the top of the prism is equal to:
  8. - block of omnidirectional synchronization pulse;
  9. - unit for modulating laser radiation and encoding an omnidirectional synchronization pulse;
  10. - rotor speed sensor, to determine the moment of emission of an omnidirectional synchronization pulse at the beginning of each scanning cycle.
  11. 2. Laser beacon for virtual reality systems with 360-degree scanning of the surrounding space according to claim 1, characterized in that a radio communication channel is installed on the body, with the help of which information can be exchanged between laser beacons, while a microcontroller is installed in one - the leading laser beacon .
  12. 3. Laser beacon for virtual reality systems with 360-degree scanning of the surrounding space according to claim 1, characterized in that a radio communication channel is installed on the body, with the help of which it is possible to exchange information between laser beacons, and a communication unit with a personal computer.

Description

The invention relates to systems for tracking the location of objects, which can be used both in virtual reality (VR) or augmented reality (AR) systems, and for controlling, landing and docking aircraft, guiding ships through narrow spaces or bridge sections, for remote control of robotic devices in areas hazardous to humans, etc. The closest in technical essence to the proposed technical solution is a laser beacon device, taken as a prototype [patent US20160131761A1], consisting of a housing, a motor, with the help of which a rotor in the form of a drum rotates, while two lenticulars are installed on the rotor, oriented orthogonally to each other relative to each other and at 45° to the scanning direction of the beams, while to generate laser radiation, a laser mounted on the housing is used, the radiation of which passes through a deflection system rigidly connected to the rotating rotor and consisting of a translucent and blind mirror, with the help of which the laser radiation is directed onto the corresponding lenticulars, which in turn form a fan-shaped plane from the laser beam. In addition, an emitter is installed on the housing, which at the beginning of each period of rotation of the drum (rotor) in a wide solid angle irradiates the surrounding space with an omnidirectional synchronization pulse, as well as a rotor speed sensor used to determine the moment of emission of the omnidirectional synchronization pulse. To synchronize several laser beacons with each other, electrical, optical or radio communication is provided between adjacent beacons. Disadvantages of this device: - the scanning angle of the surrounding space by the laser beacon is less than 180°, so there are “dead zones” in which it is impossible to determine one or two laser planes; - the omnidirectional synchronization pulse is the same for all laser beacons, which prevents the identification of received laser beams by photodetectors on the tracking object, and this leads to the difficulty of scaling the laser beacon system due to the need to synchronize the order of emission of synchronization pulses between beacons, so usually no more than two beacons are used; - the need to synchronize the speed of rotation of the drums - rotors of all beacons, since there is no identification in the signals from the beacons and in the event of desynchronization of the rotation of the rotors, the identification of signals from different beacons is disrupted. The prototype beacon is usually mounted on a tripod, which is unsafe both for the laser beacon and for operators/players moving through the tracking space, due to the possible collision of the operator/player with the laser beacon. It is advisable to install the laser beacon in a place inaccessible to the operator/player, for example, on the ceiling or wall. The prototype laser beacon is not suitable for such an application, since the full opening angle of the fan-shaped laser beam is 150° when it is rotated 45°, which does not allow scanning beams to cover the space along the axis of rotation of the beacon rotor. For a laser beacon capable of scanning the surrounding space at a 360° angle with laser fan-shaped beams overlapping the rotor rotation axis, the author proposes to install lenticulars symmetrically to the rotation axis on the side surface of a conical drum connected to a hollow engine rotor. To deflect laser beams onto the corresponding lenticulars, use an isosceles reflective prism rigidly mounted on the axis of rotation of the conical drum, while the axis of rotation of the drum should pass through the top of the prism, and to calculate coordinates using fan-shaped beams, it is proposed to use an omnidirectional synchronization pulse, as proposed in the prototype . To identify the laser radiation of laser beacons, which will allow scaling the object tracking space by multiple beacons, it is proposed to modulate the laser radiation of fan-shaped beams by frequency, while the laser radiation of neighboring beacons should be modulated at different frequencies. In addition, it is proposed to digitally encode the omnidirectional synchronization pulse, with the help of which to transmit information to the tracking object: - about the modulation frequency of the laser radiation of a given beacon; - about the identification number of the laser beacon, and also tilt the lenticulars relative to the axis of rotation of the drum to remove the “dead zone” along the axis of rotation of the laser beacon, which will make it possible to install laser beacons both on the ceiling and on any surface inaccessible to the operator/player. The technical result of the proposed invention is aimed at creating a laser beacon for virtual reality systems, which is capable of scanning the surrounding space around itself in a 360° angle, which can be installed on the ceiling and on any surface inaccessible to the operator/player. The technical result is achieved by using: two lenticulars installed symmetrically