# US 10,120,192 B2 · Short-range optical amplification module, spectacles, helmet and VR system

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- Number: US 10,120,192 B2
- Document ID: US10120192B2
- Status: Granted
- Kind: B2
- Application number: 15/129,778
- Filed: 2016-03-21
- Published: 2018-03-29
- Granted: 2018-11-06
- Earliest claimed: 2016-03-21
- Assignees: Shenzhen Dlodlo New Technology Co., Ltd.
- Applicants: Shenzhen Dlodlo New Technology Co., Ltd.
- Inventors: Gang Li; Weiping Tang
- Web page: https://patentgrep.com/patent/US10120192B2

## CPC

- G02B 27/0172: {characterised by optical features}
- G02B 5/30: Polarising elements (light-modulating devices with active elements G02F1/00)
- G02B 25/008: {comprising two or more lenses (G02B25/004 - G02B25/007 take precedence)}
- G02B 27/0012: {Optical design, e.g. procedures, algorithms, optimisation routines}
- G02B 27/01: Head-up displays
- G02B 27/28: for polarising (used in stereoscopes G02B30/25)
- G06T 3/047: Fisheye or wide-angle transformations
- G06T 3/4053: based on super-resolution, i.e. the output image resolution being higher than the sensor resolution
- G06T 19/006: {Mixed reality (object pose determination, tracking or camera calibration for mixed reality G06T7/00)}
- G02B 5/3083: {Birefringent or phase retarding elements (G02B5/3008, G02B5/3016 take precedence; systems for polarisation control G02B27/286; manufacturing phase modulating patterns by lithographic processes G03F7/001)}
- G02B 27/0025: {for optical correction, e.g. distorsion, aberration}
- G02B 27/286: {for controlling or changing the state of polarisation, e.g. transforming one polarisation state into another (G02B5/3083 takes precedence; light guide coupling means utilising polarising elements G02B6/34)}
- G02B 2027/0123: {comprising devices increasing the field of view}
- G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G06T: IMAGE DATA PROCESSING OR GENERATION, IN GENERAL

## Abstract

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.

## Claims

### Claim 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.

### Claim 2 (depends on 1)

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.

### Claim 3 (depends on 2)

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.

### Claim 4 (depends on 1)

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.

### Claim 5 (depends on 4)

The short-range optical amplification module according to claim 4, wherein the first focal length f2 of the second lens is 1.6F.

### Claim 6 (depends on 1)

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.

### Claim 7 (depends on 1)

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.

### Claim 8 (depends on 1)

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.

### Claim 9 (depends on 1)

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.

### Claim 10 (depends on 1)

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.

### Claim 11 (depends on 1)

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.

### Claim 12 (depends on 11)

A short-range optical amplification Virtual Reality (VR) system, comprising: the spectacles according to claim 11.

### Claim 13 (depends on 1)

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.

### Claim 14 (depends on 13)

A short-range optical amplification Virtual Reality (VR) system, comprising: the helmet according to claim 13.