Short-range optical amplification module, spectacles, helmet and VR system
A short-range optical amplification module, spectacles, a helmet and a VR system. The amplification module includes a reflective polarizing plate, a first phase delay plate, a second lens and a second phase delay plate, and a first lens. In the second lens, the optical surface adjacent to the second phase delay plate is a transflective optical surface. The first focal length f2 of the second lens meets the condition: 1F≤f2≤2F, wherein F is the system focal length of the optical amplification module. By performing parameter refining on the first focal length f2 that influences the optical amplification effect, the module can keep a small overall thickness while obtaining a large optical amplification effect, and the VR device can realize a good field angle, a large oculomotor range and a high-quality imaging effect.
1. A short-range optical amplification module, comprising: a reflective polarizing plate, a first phase delay plate, a second lens and a second phase delay plate that are arranged sequentially, wherein:
a first lens is further set on either side of any one of the reflective polarizing plate, the first phase delay plate, the second lens and the second phase delay plate;
in the second lens, an optical surface adjacent to the second phase delay plate is a transflective optical surface; and
a first focal length f2 of the second lens meets the following condition: 1F≤f2≤2F, wherein F is a system focal length of the short-range optical amplification module.
2. The short-range optical amplification module according to claim 1 , wherein an effective focal length fs4 of a reflection surface of the transflective optical surface meets the following condition: 1.5F≤fs4≤5F.
3. The short-range optical amplification module according to claim 2 , wherein the effective focal length fs4 of the reflection surface of the transflective optical surface meets the following condition: 1F≤fs4≤2F.
4. The short-range optical amplification module according to claim 1 , wherein the first focal length f2 of the second lens meets the following condition: 1.5F≤f2≤2F.
5. The short-range optical amplification module according to claim 4 , wherein the first focal length f2 of the second lens is 1.6F.
6. The short-range optical amplification module according to claim 1 , wherein in the second lens, a focal length fs3 of an optical surface adjacent to the first lens meets the following condition: |fs3|≥2F.
7. The short-range optical amplification module according to claim 1 , wherein a focal length f1 of the first lens meets the following condition: |f1|≥3F.
8. The short-range optical amplification module according to claim 1 , wherein a thickness of the short-range optical amplification module is 11 mm˜28 mm.
9. The short-range optical amplification module according to claim 1 , wherein an eye relief of the short-range optical amplification module is 5˜10 mm.
10. The short-range optical amplification module according to claim 1 , wherein an aperture D, through which light that takes part in imaging via the second lens and the first lens passes, meets the following condition: 0.28≤F≤D≤0.45F.
11. A short-range optical amplification spectacles, comprising: the short-range optical amplification module according to claim 1 and a display screen, wherein the display screen is set coaxially or noncoaxially with the short-range optical amplification module.
12. A short-range optical amplification Virtual Reality (VR) system, comprising: the spectacles according to claim 11 .
13. A short-range optical amplification helmet, comprising: the short-range optical amplification module according to claim 1 and a display screen, wherein the display screen is set coaxially or noncoaxially with the short-range optical amplification module.
14. A short-range optical amplification Virtual Reality (VR) system, comprising: the helmet according to claim 13 .