Search

CN-122018169-A - AR/VR module integrated with prescription diffraction lens, assembling calibration method and calibration system

CN122018169ACN 122018169 ACN122018169 ACN 122018169ACN-122018169-A

Abstract

The invention discloses an AR/VR module integrating a prescription diffraction lens, an assembling calibration method and a calibration system, which are applied to the field of AR/VR optical mechanical system integration and calibration. The scheme realizes stable assembly between the prescription diffraction lens and the display source, the waveguide or the light combiner by arranging an interface structure, a reference surface and a positioning structure on a lens frame or a carrier, and forms a closed loop flow by metering, positioning and mounting, optical path alignment, locking and fixing, calibration acquisition, error decomposition, compensation writing and acceptance filing before assembly, so as to output a traceable data packet comprising a prescription version number, an error vector, compensation parameters, an acceptance conclusion and a signature summary.

Inventors

  • Mo Tuba
  • LI JIAYI
  • SUN YUE
  • CAI XIAOGU
  • Di Make
  • WANG WEN
  • GONG SHIJIE
  • ZHAO ERSHUAI
  • LONG TAN
  • ZHANG CHI
  • ZHU ZHILIN

Assignees

  • 南通诺瞳奕目医疗科技有限公司
  • 北京诺瞳奕目医疗科技有限公司

Dates

Publication Date
20260512
Application Date
20260331

Claims (18)

  1. 1. The AR/VR module integrated with the prescription diffraction lens is characterized by comprising a display source, a waveguide assembly or a light combiner, the prescription diffraction lens, a lens frame or a carrier and a module data packet, wherein the module data packet is used for recording a module acceptance protocol and traceability data organized according to a preset field sequence, the lens frame or the carrier comprises an interface structure, and the interface structure is provided with a reference surface and a positioning structure and is used for limiting the assembly pose of the prescription diffraction lens relative to the waveguide assembly or the light combiner.
  2. 2. The integrated prescription diffraction lens AR/VR module of claim 1, wherein the locating structure comprises at least one of a locating pin and a snap-fit structure.
  3. 3. The AR/VR module of integrated prescription diffraction lens of claim 1, wherein the prescription diffraction lens is a module adapted for replacement according to prescription requirements.
  4. 4. The AR/VR module of integrated prescription diffractive lens according to claim 1, wherein said prescription diffractive lens has a transmittance that meets eye tracking requirements at least one near infrared operating wavelength of 850nm and 940 nm.
  5. 5. The AR/VR module for integrated prescription diffractive lens according to claim 1, wherein said module data packet comprises a prescription version number and a hash digest.
  6. 6. The AR/VR module for integrated prescription diffractive lens according to claim 5, wherein said module data package further comprises a signature field, an audit log, a compensation LUT version, and an acceptance conclusion.
  7. 7. The integrated prescription diffraction lens AR/VR module of claim 1, wherein the interface structure defines a translational tolerance threshold and a tilt tolerance threshold.
  8. 8. The integrated prescription diffraction lens AR/VR module of claim 1, wherein the module acceptance protocol includes at least an interface error threshold, an aberration index threshold, and a near infrared transmittance threshold.
  9. 9. The method for assembling and calibrating the AR/VR module integrating the prescription diffraction lens is characterized by comprising the steps of acquiring a prescription and a design package, metering before assembling, positioning and installing, aligning an optical path, locking and fixing, calibrating and collecting, decomposing errors, compensating and writing in, and generating an acceptance report and archiving a signature.
  10. 10. The method of claim 9, wherein the error resolution yields an interface error vector e= [ Δx, Δy, Δα, Δβ ] T, wherein Δx represents a lateral translational error in a first reference plane, Δy represents a longitudinal translational error in a second reference plane, Δα represents a tilt angle error about a first axis, Δβ represents a tilt angle error about a second axis, and T represents a vector transpose.
  11. 11. The method of claim 9, wherein the alignment objective in the optical path alignment process is to minimize an aberration evaluation function.
  12. 12. The method for assembling calibration of an AR/VR module for an integrated prescription diffractive lens as in claim 9, wherein the acceptance report includes pass or fail conclusions and trace back fields.
  13. 13. The method of claim 9, wherein the image plane drift or aberration drift, i.e. temperature drift, occurs at different temperature points after assembly, and the temperature drift is corrected by thermal compensation parameters.
  14. 14. The method of claim 13, wherein the thermal compensation parameters are updated with temperature sampling points and used to correct at least one of compensation LUTs and predistortion parameters.
  15. 15. The method of claim 9, wherein the calibration results are written in standardized module data packets in a predetermined field order.
  16. 16. The method of claim 9, wherein the fitting calibration record is written to an audit chain for retrospection.
  17. 17. A calibration system for implementing the method of assembly calibration of an AR/VR module for an integrated prescription diffraction lens as claimed in any one of claims 9-16, comprising a test pattern or display source, a camera or sensor, a data processing module and a compensation writing module.
  18. 18. The system of claim 17, wherein the system collects near infrared detection images to verify the transmission state of the prescription diffractive lens at near infrared operating wavelengths.

Description

AR/VR module integrated with prescription diffraction lens, assembling calibration method and calibration system Technical Field The invention relates to the field of AR/VR (AR/VR) optical mechanical system integration and calibration, in particular to an AR/VR module integrating a prescription diffraction lens, an assembly calibration method and a calibration system. Background Augmented Reality (AR) and Virtual Reality (VR) technologies have rapidly evolved in recent years, and head-mounted display devices are evolving toward lightweight, high image quality, and individuation. As the user community permeates from early adoption to mass market, the need for vision correction for ametropia (myopia, hyperopia, astigmatism) users becomes a critical issue in the popularity of AR/VR devices. Conventional solutions typically employ an add-on refractive corrective lens, i.e., a refractive lens is superimposed in front of or behind the original waveguide optical module. However, the design has obvious defects that firstly, the additional lens increases the volume and the weight of the optical system, which is contrary to the trend of light and thin pursuit of AR/VR equipment, secondly, chromatic aberration, field curvature and other aberration of the refractive lens can be coupled with the waveguide optical system to reduce the overall imaging quality, and furthermore, the additional lens and the waveguide module lack of an accurate positioning interface, so that the assembly error is difficult to control, and the correction effect of an individual prescription is unstable. In recent years, a technical idea of integrating a diffractive optical element with a prescription correction function has been proposed, i.e., directly introducing a diffractive lens having optical power in the optical path. This approach theoretically allows refractive correction without significantly increasing the volume. However, in the actual mass production integration process, the assembly of the prescription diffraction lens, the display source and the waveguide module faces multiple technical challenges, namely, the lack of an optical-mechanical interface structure leads to insufficient lens positioning precision and introduces additional translational and inclination errors, the transmission mechanism of the assembly errors is ambiguous, quantitative mapping from geometric errors to image quality degradation is difficult to establish, an efficient online calibration and compensation means is lacking, residual errors cannot be corrected after assembly, and the data consistency and traceability in cross-site production are insufficient, so that the quality gating requirements of large-scale manufacturing are difficult to meet. In addition, eye tracking functionality is increasingly popular in modern AR/VR devices, requiring prescription lenses with good transmission in the near infrared (e.g., 850nm/940 nm) range, which is often not specifically optimized for conventional prescription lenses. Meanwhile, the problems of optical system drift, recalibration after the prescription lens is replaced by a user and the like caused by temperature change also put higher requirements on maintainability and environmental adaptability of the module. Integrating prescription diffraction lenses into modules faces challenges such as interface errors, assembly tolerances, temperature drift, and calibration consistency, and a set of mass-producible, verifiable, traceable opto-mechanical interfaces and calibration compensation schemes is needed. Disclosure of Invention The invention is characterized in that the prescription correction and waveguide image quality matching are realized by defining interface structures such as a reference surface/locating pin of a lens and a module and combining metering, optical path alignment, error decomposition (translation/inclination) and compensation LUT writing before assembly. In order to solve the problems, the invention adopts the following technical scheme. An AR/VR module integrating a prescription diffraction lens comprises a display source, a waveguide assembly or a light combiner, the prescription diffraction lens, a lens frame or a carrier and a module data packet, wherein the module data packet is used for recording module acceptance protocols and traceability data organized according to a preset field sequence, the lens frame or the carrier comprises an interface structure, and the interface structure is provided with a reference surface and a positioning structure and used for limiting the assembly pose of the prescription diffraction lens relative to the waveguide assembly or the light combiner. Further, the positioning structure comprises at least one of a positioning pin and a buckling structure. Further, the prescription diffraction lens is a module adapted to be replaced according to prescription requirements. Further, the prescription diffractive lens has a transmittance that meets eye tracking req