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CN-224232051-U - Optical system and near-to-eye display device

CN224232051UCN 224232051 UCN224232051 UCN 224232051UCN-224232051-U

Abstract

The embodiment of the utility model discloses an optical system and near-to-eye display equipment, which comprise an illumination module, a polarization beam splitter prism, a display image source, a quarter wave plate, a reflecting lens and a cementing lens, wherein light rays of the illumination module enter the polarization beam splitter prism, the polarization beam splitter prism reflects polarized light to the display image source, transmits image light rays generated by the display image source to the reflecting lens, and reflects image light rays reflected by the reflecting lens to a third side surface of the polarization beam splitter prism to be emitted. In the optical system, the quantity of light rays incident on a display image source can be increased, so that the definition of a subsequent image is improved, meanwhile, polarized light and imaging light share one polarization beam splitter prism, the volume and the weight of the optical system are reduced, and the user experience is improved.

Inventors

  • CHEN PENGBO
  • WANG TAO
  • XU GUOJUN
  • XU GANG

Assignees

  • 立讯精密科技(南京)有限公司

Dates

Publication Date
20260512
Application Date
20250526

Claims (10)

  1. 1. The utility model provides an optical system, its characterized in that, optical system includes illumination module (10), polarization beam splitter prism (4), shows image source (5), quarter wave plate (6), reflection lens (7) and cemented lens (8), polarization beam splitter prism (4) are including encircling along first direction polarization beam splitter prism (4)'s center sets gradually first side (41), second side (42), third side (43) and fourth side (44), polarization beam splitter prism (4) first side (41) are located in the light-emitting direction of illumination module (10), cemented lens (8) set up between polarization beam splitter prism (4) fourth side (44) and show image source (5), quarter wave plate (6) set up between polarization beam splitter prism (4) second side (42) and reflection lens (7).
  2. 2. The optical system according to claim 1, further comprising an imaging lens (9), the imaging lens (9) being arranged adjacent to a third side (43) of the polarizing beam-splitting prism (4), the imaging lens (9) having a first refractive surface and a second refractive surface opposite each other, the first refractive surface and the second refractive surface each being concave in a direction away from the polarizing beam-splitting prism (4), and a radius of curvature of the first refractive surface being larger than a radius of curvature of the second refractive surface.
  3. 3. An optical system according to claim 2, characterized in that the reflective lens (7) has a transmissive surface (71) and a reflective surface (72), the reflective surface (72) being located on the side of the reflective lens (7) remote from the quarter wave plate (6), the transmissive surface (71) being planar, the reflective surface (72) protruding in a direction remote from the quarter wave plate (6); One side of the quarter wave plate (6) is attached to the third side face (43) of the polarization beam splitter prism (4), and the other side of the quarter wave plate (6) is attached to the transmission face (71).
  4. 4. An optical system according to claim 3, characterized in that the illumination module (10) comprises a light source (1), a polarization converter (31) and a linear polarizer (32), the polarization converter (31) and the linear polarizer (32) being arranged in sequence between the light source (1) and the first side (41) of the polarization splitting prism (4).
  5. 5. The optical system according to claim 4, wherein the illumination module (10) further comprises a first collimating lens (21), a second collimating lens (22) and a fly eye lens (23), the first collimating lens (21), the second collimating lens (22) and the fly eye lens (23) being arranged in sequence between the light source (1) and the polarization converter (31).
  6. 6. The optical system according to claim 5, wherein the first collimating lens (21) and the second collimating lens (22) are spherical mirrors, and the first collimating lens (21) and the second collimating lens (22) are convex lenses.
  7. 7. An optical system according to any one of claims 1-6, characterized in that the display image source (5) is an LCOS device.
  8. 8. An optical system according to any one of claims 1-6, characterized in that the polarizing beam splitter prism (4) comprises two symmetrically arranged triangular prisms, the inclined surfaces of the two triangular prisms being glued, the inclined surfaces being provided with polarizing beam splitter film forming facets (45).
  9. 9. The optical system of any one of claims 1-6, wherein the optical system has a focal length in the range of 6.1mm-8.12mm and a drain volume of less than 0.8cc.
  10. 10. A near-eye display device comprising an optical waveguide provided in a light-emitting direction of the optical system, and the optical system according to any one of claims 1 to 9.

Description

Optical system and near-to-eye display device Technical Field The utility model relates to the technical field of optics, in particular to an optical system and near-eye display equipment. Background In an augmented reality system, an optical system is used as a core component and is responsible for accurately overlaying virtual image information into a real visual scene of a user. Specifically, the optical waveguide type AR display device relies on an optical system to realize two key functions of firstly preprocessing an image signal, namely optically amplifying and optimizing image quality of an original image projected by a micro display chip so as to meet the optical parameter requirements of an optical waveguide device, and secondly, performing optical field coupling regulation and control, and efficiently coupling the processed image signal into an optical waveguide path through precise optical design so as to ensure uniform light energy distribution and meet the exit pupil characteristic. Since the AR display device is a wearable headset, it must meet stringent light weight and compact requirements. The optical system acts as a core component, the size and weight of which directly relates to the overall comfort of wear. However, in the existing near-eye display device, the number of optical elements used is large, the device is complex, and the defects of large volume, heavy mass, low definition and the like exist, so that the overall experience of the user is deviated. Disclosure of utility model In view of the above, the embodiment of the utility model provides an optical system and a near-eye display device, which can improve definition, reduce the volume and weight of the optical system, and improve user experience. In a first aspect, an embodiment of the present utility model provides an optical system, where the optical system includes an illumination module, a polarization beam splitter prism, a display image source, a quarter wave plate, a reflection lens, and a cemented lens, the polarization beam splitter prism includes a first side, a second side, a third side, and a fourth side that are sequentially disposed around a center of the polarization beam splitter prism along a first direction, the first side of the polarization beam splitter prism is disposed in a light emitting direction of the illumination module, the cemented lens is disposed between the fourth side of the polarization beam splitter prism and the display image source, and the quarter wave plate is disposed between the second side of the polarization beam splitter prism and the reflection lens. Optionally, the optical system further includes an imaging lens disposed adjacent to the third side of the polarization splitting prism, the imaging lens having a first refractive surface and a second refractive surface opposite to each other, the first refractive surface and the second refractive surface each being concave in a direction away from the polarization splitting prism, and a radius of curvature of the first refractive surface being larger than a radius of curvature of the second refractive surface. Optionally, the reflecting lens has a transmitting surface and a reflecting surface, the reflecting surface is located at one side of the reflecting lens away from the quarter wave plate, the transmitting surface is a plane, and the reflecting surface protrudes towards a direction away from the quarter wave plate; One side of the quarter wave plate is attached to the second side face of the polarization beam splitter prism, and the other side of the quarter wave plate is attached to the transmission face. Optionally, the illumination module includes a light source, a polarization converter, and a linear polarizer, where the polarization converter and the linear polarizer are sequentially disposed between the light source and the first side of the polarization splitting prism. Optionally, the illumination module includes a first collimating lens, a second collimating lens, and a fly eye lens, where the first collimating lens, the second collimating lens, and the fly eye lens are sequentially disposed between the light source and the polarization converter. Optionally, the first collimating lens and the second collimating lens are spherical mirrors, and the first collimating lens and the second collimating lens are convex lenses. Optionally, the display image source is an LCOS device. Optionally, the polarization beam splitter prism includes two symmetrically arranged triangular prisms, and inclined planes of the two triangular prisms are glued, and the inclined planes are provided with polarization beam splitter film forming light splitting surfaces. Optionally, the focal length of the optical system is in the range of 6.1mm-8.12mm, and the drainage volume of the optical system is less than 0.8cc. In a second aspect, an embodiment of the present utility model further provides a near-eye display device, where the near-eye display