CN211786369U - Optical module and virtual reality device - Google Patents
Optical module and virtual reality device Download PDFInfo
- Publication number
- CN211786369U CN211786369U CN202020157424.XU CN202020157424U CN211786369U CN 211786369 U CN211786369 U CN 211786369U CN 202020157424 U CN202020157424 U CN 202020157424U CN 211786369 U CN211786369 U CN 211786369U
- Authority
- CN
- China
- Prior art keywords
- optical
- optical element
- polarization direction
- light beam
- optical module
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Images
Abstract
The utility model discloses an optical module and virtual reality device, this optical module include first optical element, second optical element, third optical element, first phase modulation component and second phase modulation component, first optical element, first phase modulation component, second optical element, third optical element arrange the setting in proper order. Through ingenious integration and design of the first optical element, the second optical element, the third optical element, the first phase modulation element and the second phase modulation element, the light beam is reflected and folded for three times in the optical module, the system length of the optical module is shortened, the structure is more compact, the size is smaller, and the weight is lighter.
Description
Technical Field
The utility model relates to an optical display technical field particularly, relates to an optical module and virtual reality device.
Background
In the virtual reality field, most of the optical modules of the existing VR glasses (also called virtual reality glasses or virtual reality devices) have a relatively large thickness, as shown in fig. 2, the total length of the optical modules is usually not less than the focal length of the optical modules, and the focal length of the optical modules is generally 30-40 mm, so that the VR products are difficult to be thinned and the burden is brought when the VR glasses are worn.
SUMMERY OF THE UTILITY MODEL
In view of the above, an object of the present invention is to provide a small and light optical module and a virtual reality apparatus, so as to solve the above problems.
In order to achieve the above object, the utility model provides a following technical scheme:
the utility model discloses preferred embodiment provides an optical module, include: the phase modulation device comprises a first optical element, a second optical element, a third optical element, a first phase modulation element and a second phase modulation element, wherein the first optical element, the first phase modulation element, the second optical element and the third optical element are sequentially arranged;
the first optical element is provided with an optical surface for reflecting the light beam with the first polarization direction and transmitting the light beam with the second polarization direction; the third optical element is provided with an optical surface which transmits the light beam with the first polarization direction and reflects the light beam with the second polarization direction; the second optical element is provided with an optical surface for reflecting the light beam with the third polarization direction and transmitting the light beam with the fourth polarization direction;
the first polarization direction and the second polarization direction are vertical to each other; the third polarization direction and the fourth polarization direction are perpendicular to each other; the first polarization direction and the third polarization direction have a phase difference of 45 degrees;
at least one of the first optical element, the second optical element and the third optical element has a curved optical surface.
Optionally, the first phase modulation element is an 1/4 wave plate and the first phase modulation element is a 1/4 wave plate.
Optionally, an optical surface of the first optical element on a side away from the second optical element is a concave surface.
Optionally, the optical surface of the second optical element on the side close to the first optical element is concave.
Optionally, the optical surface of the third optical element on the side close to the first optical element is concave.
Optionally, the optical module further comprises an optical path adjusting mechanism.
Optionally, the optical path adjusting mechanism is disposed on the second optical element, and is configured to adjust a distance of the second optical element relative to the first optical element.
The utility model also provides a virtual reality device, including foretell optical module and display element, the display element is used for showing the image, and to optical module one side sends the polarized light that has predetermined polarization state.
The utility model provides an optical module is through ingenious integration and the design to first optical element, second optical element, third optical element, first phase modulation component and second phase modulation component for the light beam is folding at the inside cubic reflection of optical module, thereby has shortened optical module's system length, and the structure is compacter, the volume is littleer, and weight is also lighter. And the optical path adjusting mechanism is arranged to adjust the position and distance of the first optical element, the second optical element or the third optical element, so that a user with myopia or hyperopia can clearly view image information on the display element placed at the focal plane of the optical module without wearing myopia or hyperopia correcting glasses.
The utility model provides a virtual reality device includes above-mentioned optical module, therefore has similar beneficial effect.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required to be used in the embodiments will be briefly described below. It is understood that the following drawings depict only some embodiments of the invention and are therefore not to be considered limiting of its scope, for the person skilled in the art will be able to derive from them other related drawings without inventive faculty.
Fig. 1 is a schematic structural diagram of an optical module according to a preferred embodiment of the present invention.
Fig. 2 is a schematic structural diagram of an optical module used in a conventional virtual reality device.
Fig. 3 is a schematic diagram illustrating length calculation of an optical module according to the present invention.
Fig. 4 is a schematic structural diagram of another optical module according to a preferred embodiment of the present invention.
Fig. 5 is a schematic structural diagram of another optical module according to a preferred embodiment of the present invention.
Fig. 6 is a schematic structural diagram of another optical module according to a preferred embodiment of the present invention.
Icon: 100-an optical module; 11-a first optical element; 12-a first phase modulating element; 13-a second optical element; 14-a second phase modulation element; 15-a third optical element; 10-focal plane; 500-optical path adjusting mechanism; 300-exit pupil of optical module.
Detailed Description
Thus, the following detailed description of the embodiments of the present invention, presented in the accompanying drawings, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. Based on the embodiment of the present invention, all other embodiments obtained by the person skilled in the art without creative work belong to the protection scope of the present invention.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures. In the description of the present invention, the terms "first", "second", "third", "fourth", etc. are used only for distinguishing the description, and are not to be construed as limiting or implying only relative importance.
Referring to fig. 1, fig. 1 is a schematic structural diagram of an optical module according to an embodiment of the present invention. As shown in fig. 1, the optical module 100 includes a first optical element 11, a second optical element 13, a third optical element 15, a first phase modulation element 12, and a second phase modulation element 14, wherein the first optical element 11, the first phase modulation element 12, the second phase modulation element 14, the second optical element 13, and the third optical element 5 are sequentially arranged.
The first optical element 11 has an optical surface S111 that reflects the light beam with the first polarization direction and transmits the light beam with the second polarization direction; the third optical element 15 has an optical surface that transmits the light beam of the first polarization direction and reflects the light beam of the second polarization direction; the second optical element 13 has an optical surface that reflects the light flux of the third polarization direction and transmits the light flux of the fourth polarization direction.
The first polarization direction and the second polarization direction are vertical to each other; the third polarization direction and the fourth polarization direction are vertical to each other; the first polarization direction and the third polarization direction have a phase difference of 45 degrees therebetween.
As shown in fig. 1, the optical path of the light beam in the optical module 10 is specifically:
the light beam enters from one side of the third optical element 15 of the optical module 100, the light beam having the first polarization direction (denoted by p in fig. 1) in the light beam passes through the third optical element 15, the first polarization direction light beam transmitted out of the third optical element 15 passes through the second phase modulation element 14, the polarization direction of the first polarization direction light beam is changed, the third polarization direction (denoted by p + λ/4 in fig. 1) in the light beam with the changed polarization direction is reflected by the second optical element 13, the second polarization direction of the second polarization direction (denoted by s in fig. 1) in the light beam with the changed polarization direction is changed again after the second polarization direction light beam passes through the second phase modulation element 14 for the third time, the polarization direction of the reflected light beam is changed again, and the fourth polarization direction (denoted by s + λ/4 in fig. 1) in the light beam with the changed polarization direction is transmitted from the second optical element 13. The light beam of the fourth polarization direction transmitted from the second optical element 13 changes its polarization direction after passing through the first phase modulation element 12, the light beam of the first polarization direction among the light beams of which the polarization direction is changed passes through the first phase modulation element 12 for the second time after being reflected by the first optical element 11, the polarization direction thereof changes, the light beam of the third polarization direction among the light beams of which the polarization direction is changed passes through the first phase modulation element 12 for the third time, the polarization direction thereof changes, and the light beam of the fourth polarization direction among the light beams of which the polarization direction is changed exits from the first optical element 11. When a display element, such as an LCD display device or an OLED display device, is placed on the side of the third optical element 15 away from the first optical element 11, a virtual image of the image on the display element magnified by the optical module 100 can be observed on the side of the first optical element 11.
Typically, when the first phase modulation element 12 and the second phase modulation element 14 are both 1/4 wave plates, the polarization direction of the light beam after passing through the first phase modulation element 12 or the second phase modulation element 14 each time can be completely converted to meet the polarization reflection and transmission requirements of the first optical element 11, the second optical element 13, or the third optical element 15, so that the light beam finally transmitted from the first optical element 11 has the maximum energy transmittance relative to the light beam incident from the third optical element 15 side of the optical module 100.
The S111 optical surface of the first optical element 11 in fig. 1 is disposed to face the concave surface of the second optical element 13, and is disposed to reflect the light beam with the first polarization direction and transmit the light beam with the second polarization direction, and the light beam is reflected and transmitted on the S111 optical surface with curvature, which is equivalent to using the power of the twice curved surface, not only changing the propagation direction of the light beam, but also achieving the effect of optical amplification. The S112 optical surface of the first optical element 11 may be an optical plane or an optical curved surface, and an anti-reflection film layer may be further provided on the S112 optical surface to increase the transmittance of the light beam on the S112 optical surface.
Since the light beams are reflected by the third optical element 15, the second optical element 13 and the first optical element 11, respectively, the effect of folding the light path is achieved, and the total length of the optical module 100 can be effectively shortened.
As shown in fig. 3, for the schematic diagram of calculating the length of the optical module, the distance from the focal plane 10 of the optical module 100 to the third optical element 15 is L1, the distance from the third optical element 15 to the second optical element 14 is L2, the distance from the second optical element 14 to the first optical element 11 is L3, and the distance from the first optical element 11 to the exit pupil 300 of the optical module 100 is L4. The total system length from the focal plane 10 to the first optical element 11 is L0, L0 is L1+ L2+ L3, the total optical path of the image beam of the display element after being emitted from the focal plane 10 and entering the optical module 100 is equivalent to L1+ 3L 2+ L3, the total optical path EPD of the beam after being reflected from the S112 optical surface of the first optical element 11 to the exit pupil 300 of the optical module 100 is L4+ 2L 3, and the total optical path EPD is equivalent to the exit pupil distance of the optical module 100. From the above relationship, it can be derived that L0 is (L + 2L 1+ 2L 3)/3, and for the pre-designed total optical path length L, the total optical path length L is usually the equivalent focal length of the optical module 100, and the equivalent focal length determines the optical magnification of the optical module 100 for the display device. When the distances L1 and L3 from the focal plane 10 to the third optical element 15 are shortened, the total system length L0 is also shortened to be even close to one third of the total optical length L, for example, when the total optical length L is 33mm (usually, the focal length of the conventional VR optical module shown in fig. 2 is 30-40 mm), the total system length L0 may be 13mm, which is greatly shortened compared to the conventional VR optical system. Meanwhile, the reduction of the distance L3 also reduces the exit pupil distance EPD of the optical module 100, and a shorter exit pupil distance means easier design of the optical module and a smaller aperture of the first optical element 11.
As shown in fig. 4, the optical module structure differs from that shown in fig. 1 only in that the optical surface S152 of the third optical element 15 on the side away from the first optical element 11 is a concave surface facing the first optical element 11, and the concave surface is configured to transmit the light beam of the first polarization direction and reflect the light beam of the second polarization direction, and the optical surface S151 is configured with an antireflection film layer.
As shown in fig. 5, the optical surface of the S131 of the second optical element 13 is a concave surface facing the first optical element 11, and a non-polarization-dependent transflective film layer is disposed on the S131, and an optical film layer having polarization-dependent light beam reflection in the third polarization direction and light beam transmission in the fourth polarization direction may also be disposed on the S131. The S132 optical surface of the second optical element 13 is arranged to reflect the light beam of the third polarization direction and to transmit the light beam of the fourth polarization direction. The first optical element 11 is a planar optical element, and the S111 optical surface thereof is provided with an antireflection film, and the S112 optical surface is provided to reflect a light beam of the first polarization direction and transmit a light beam of the second polarization direction. In another possible embodiment, the S112 optical surface of the first optical element 11 may also be a concave surface facing the second optical element 13, and the concave surface is provided with a film layer for reflecting the light beam with the first polarization direction and transmitting the light beam with the second polarization direction, and the light beam entering from the third optical element 15 is reflected by the S112 optical surface of the first optical element 11 and reflected by the S131 optical surface of the second optical element 13 in sequence, so that the optical amplification effect is achieved by using the power of the twice curved surface, and simultaneously, compared with the case where only the S132 optical surface of the second optical element 13 is a concave surface, the requirement of the curvature radius of the S112 optical surface and the S131 optical surface is reduced, thereby facilitating the design and processing of the first optical element 11 and the third optical element 13.
In one possible embodiment, the optical module 100 further includes an optical path adjusting mechanism 500, the optical path adjusting mechanism 500 may be disposed on any one of the first optical element 11, the second optical element 13, or the third optical element 15, as shown in fig. 6, the optical path adjusting mechanism 500 is disposed on the second optical element 13, and the optical path adjusting mechanism 500 adjusts the axial position of the second optical element so that the distance between the second optical element 13 and the first optical element 11 is changed, for example, the second optical element 13 is adjusted to move Δ L toward the third optical element 15, when the total optical path L '═ L1+3 (L2- Δ L) + (L3 +. Δ L) ═ L1+ 3L 2+ L3-2 Δ L of the light beam from the focal plane 10 to the first optical element 11 is compared with the total optical path L' ═ L1+3 × 2L 3 before distance adjustment, the total optical length L' is changed, which means that the object distance of the display element arranged at the position of the focal plane 10 relative to the optical module 100 is shortened, so that the virtual image distance of the display element passing through the optical module 100 is also shortened, a myopia person can observe a clear image through the optical module without wearing the myopia correction glasses, and the total system length L0 is not changed because the first optical element 11 and the third optical element 15 are not adjusted. Since the first phase modulation element 12 and the second phase modulation element 14 only change the polarization direction of the light beam and do not affect the total optical path of the light beam in the optical module 100, when the first phase modulation element 12 and the second phase modulation element 14 are attached to the second optical element 13 in the implementation, the above object can still be achieved by adjusting the second optical element 13 to which the first phase modulation element 12 and the second phase modulation element 14 are attached. In another possible embodiment, the optical path length adjusting mechanism 500 may be disposed on the first optical element 11 or the third optical element 15, and it is also possible to adjust the distance of the virtual image of the display element after passing through the optical module 100 by adjusting the total optical path length of the light beam from the focal plane 10 to the first optical element 11, but the total system length L0 will change accordingly. The optical path adjusting mechanism 500 may be a manual adjusting mechanism or an electric adjusting mechanism, which is not limited herein.
In order to meet some specific functional requirements, functional film layers such as a hard film, an anti-fog film, etc. may be selectively added on the S111 optical surface of the first optical element 11 in the optical module 100, which is not limited herein.
The embodiment of the utility model provides a still provide a virtual reality device, this virtual reality device include foretell optical module 100 and display element, and display element is used for showing the image, and to optical module one side sends the polarized light that has predetermined polarization state, and usually, display element can select LCD or OLED display device, and the image light beam that LCD display device sent has predetermined polarization state, and its polarization state is confirmed by the inside polarization component of LCD display device. The image light beam emitted by the OLED display device is unpolarized, and a polarizing element can be arranged on the emergent end face of the OLED display device, so that the image light beam passing through the polarizing element is polarized light with a predetermined polarization state. The display element is arranged at the focal plane 10 of the optical module 100. In practical implementation, the virtual reality apparatus may further include a head-mount, an eye-mask, and a structural member connecting the components and the display element included in the optical module 100.
The utility model provides an optical module is through ingenious integration and the design to first optical element, second optical element, third optical element, first phase modulation component and second phase modulation component for the light beam is folding at the inside cubic reflection of optical module, thereby has shortened optical module's system length, and the structure is compacter, the volume is littleer, and weight is also lighter. And the optical path adjusting mechanism is arranged to adjust the position and distance of the first optical element, the second optical element or the third optical element, so that a user with myopia or hyperopia can clearly view image information on the display element arranged at the focal plane 10 of the optical module without wearing myopia or hyperopia correcting glasses.
The utility model provides a virtual reality device includes above-mentioned optical module 100, therefore has similar beneficial effect.
Any feature disclosed in this specification (including any accompanying claims, abstract and drawings), may be replaced by alternative features serving equivalent or similar purposes, unless expressly stated otherwise. That is, unless expressly stated otherwise, each feature is only an example of a generic series of equivalent or similar features.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (8)
1. An optical module is characterized by comprising a first optical element, a second optical element, a third optical element, a first phase modulation element and a second phase modulation element, wherein the first optical element, the first phase modulation element, the second optical element and the third optical element are sequentially arranged;
the first optical element is provided with an optical surface for reflecting the light beam with the first polarization direction and transmitting the light beam with the second polarization direction; the third optical element is provided with an optical surface which transmits the light beam with the first polarization direction and reflects the light beam with the second polarization direction; the second optical element is provided with an optical surface for reflecting the light beam with the third polarization direction and transmitting the light beam with the fourth polarization direction;
the first polarization direction and the second polarization direction are vertical to each other; the third polarization direction and the fourth polarization direction are perpendicular to each other; the first polarization direction and the third polarization direction have a phase difference of 45 degrees;
at least one of the first optical element, the second optical element and the third optical element has a curved optical surface.
2. The optical module of claim 1 wherein the first phase modulating element is an 1/4 wave plate and the second phase modulating element is a 1/4 wave plate.
3. The optical module of claim 2 wherein the optical surface of the first optical element on a side away from the second optical element is concave.
4. The optical module of claim 2 wherein the optical surface of the second optical element on a side adjacent to the first optical element is concave.
5. The optical module of claim 3 wherein the optical surface of the third optical element on a side adjacent to the first optical element is concave.
6. The optical module of any of claims 1-5 further comprising an optical path length adjustment mechanism.
7. The optical module of claim 6 wherein the optical path length adjustment mechanism is configured to adjust the distance between the second optical element and the first optical element.
8. A virtual reality device comprising the optical module of any one of claims 1-7 and a display element for displaying an image and emitting polarized light having a predetermined polarization state to one side of the optical module.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020157424.XU CN211786369U (en) | 2020-02-10 | 2020-02-10 | Optical module and virtual reality device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020157424.XU CN211786369U (en) | 2020-02-10 | 2020-02-10 | Optical module and virtual reality device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211786369U true CN211786369U (en) | 2020-10-27 |
Family
ID=72904903
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202020157424.XU Expired - Fee Related CN211786369U (en) | 2020-02-10 | 2020-02-10 | Optical module and virtual reality device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN211786369U (en) |
-
2020
- 2020-02-10 CN CN202020157424.XU patent/CN211786369U/en not_active Expired - Fee Related
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US10955676B2 (en) | Head mounted imaging apparatus with optical coupling | |
| US6671100B1 (en) | Virtual imaging system | |
| US20190018255A1 (en) | Compact near-eye optical system including a refractive beam-splitting convex lens | |
| KR20200009121A (en) | Augmented reality display with multi-element adaptive lens for changing depth planes | |
| EP3482240B1 (en) | Head mounted imaging apparatus with optical coupling | |
| US20190025602A1 (en) | Compact near-eye display optics for augmented reality | |
| CN113359300B (en) | Thin film type near-to-eye display system and glasses with built-in display system | |
| CN104614858A (en) | Saw tooth structure plane waveguide visual optical display device for enhancing reality | |
| CN105629494B (en) | A kind of short distance optical amplifier module, glasses, the helmet and VR systems | |
| CN210776039U (en) | Miniaturized short-distance optical system | |
| JP2002287077A (en) | Video display device | |
| US20200124853A1 (en) | Optical transmitting module and head mounted display device | |
| WO2021218080A1 (en) | Optical display system having folded optical path, and wearable device | |
| CN109656025A (en) | Projecting optical device of the augmented reality in conjunction with glasses | |
| CN114450622A (en) | Near-to-eye optical system implementing a waveguide having an output viewer element with a refractive beam-splitting convex lens | |
| CN111474715A (en) | Optical system and augmented reality device | |
| CN211786369U (en) | Optical module and virtual reality device | |
| CN114967148B (en) | Optical waveguide device and augmented reality display apparatus | |
| CN116626896A (en) | Optical system and virtual reality device | |
| CN212623170U (en) | Compact optical module and near-to-eye display device | |
| CN214795428U (en) | Waveguide assembly and folding AR eyepiece with front-mounted optical machine | |
| US11573422B2 (en) | Near-eye display system having multiple pass in-coupling for waveguide display | |
| KR20160113089A (en) | Focus control optical system module for head mounted display | |
| CN112505920A (en) | Miniaturized short-distance optical system | |
| CN215116991U (en) | Augmented reality display system and augmented reality display equipment |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20201027 Termination date: 20220210 |