CN112433343A - Optical imaging module and virtual reality equipment - Google Patents
Optical imaging module and virtual reality equipment Download PDFInfo
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- CN112433343A CN112433343A CN202011401339.4A CN202011401339A CN112433343A CN 112433343 A CN112433343 A CN 112433343A CN 202011401339 A CN202011401339 A CN 202011401339A CN 112433343 A CN112433343 A CN 112433343A
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- lens
- imaging module
- optical imaging
- object side
- aspheric surface
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
- G02B13/0015—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design
- G02B13/002—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface
- G02B13/0035—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface having three lenses
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
- G02B13/0055—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras employing a special optical element
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/18—Optical objectives specially designed for the purposes specified below with lenses having one or more non-spherical faces, e.g. for reducing geometrical aberration
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/01—Head-up displays
- G02B27/017—Head mounted
- G02B27/0172—Head mounted characterised by optical features
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/01—Head-up displays
- G02B27/0101—Head-up displays characterised by optical features
- G02B2027/0123—Head-up displays characterised by optical features comprising devices increasing the field of view
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
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Abstract
The invention discloses an optical imaging module and virtual reality equipment, wherein the optical imaging module sequentially comprises the following components from an imaging surface to an object side along an optical axis: the image side surface of the first lens is an aspheric surface, the object side surface of the first lens is a plane, and the object side surface of the first lens is plated with a polarization beam splitting film; a second lens; the image side surface of the third lens is a concave aspheric surface, the image side surface of the third lens is plated with a semi-transparent semi-reflective film, and the object side surface of the third lens is a high-order aspheric surface; a display screen. On the basis of folding the light path, the invention reduces the clear aperture of the optical imaging module through effective optical design so as to realize a small-size imaging system, and simultaneously can keep a larger field angle and a better imaging display effect.
Description
Technical Field
The invention relates to the technical field of virtual reality equipment, in particular to an optical imaging module and virtual reality equipment.
Background
The optical imaging module is an important component of a Virtual Reality (VR) device, and the current mainstream VR device has design requirements of lightness, thinness and small size of a system in more and more consideration during product design, and simultaneously ensures a larger view field angle, an eye movement range and a high-quality imaging effect so as to improve the immersion of VR display and enhance user experience.
At present, the principle of polarization folding light path is adopted in ultra-thin VR devices more, so that the light path is folded in the direction of an eye axis to move back and forth, and the size in the direction is compressed to realize the lightness and thinness of an optical imaging module. However, the radial dimension of the whole optical imaging module is often restricted by the dimension of the VR display device, so that the aperture of the optical lens and the module is relatively large, and therefore, the size and the weight of the device cannot be further reduced.
Disclosure of Invention
Therefore, an object of the present invention is to provide a small-sized optical imaging module, while maintaining a large viewing angle and a good imaging display effect.
An optical imaging module, comprising in order from an imaging surface to an object side along an optical axis:
the image side surface of the first lens is an aspheric surface, the object side surface of the first lens is a plane, and the object side surface of the first lens is plated with a polarization beam splitting film;
a second lens;
the image side surface of the third lens is a concave aspheric surface, the image side surface of the third lens is plated with a semi-transparent semi-reflective film, and the object side surface of the third lens is a high-order aspheric surface;
a display screen.
According to the optical imaging module provided by the invention, the polarization beam splitting film is arranged on the object side surface of the first lens, the semi-transparent semi-reflective film is arranged on the image side surface of the third lens, so that a folded light path is realized, and the object side surface of the third lens is a high-order aspheric surface, so that the object side surface of the third lens has larger curvature, and therefore, larger-angle light rays emitted by large view field points can be coupled into the folded cavity of the lens group to realize imaging, and the whole clear aperture of the three lenses can be effectively reduced.
In addition, the optical imaging module according to the present invention may further have the following additional features:
further, the optical imaging module satisfies the following conditional expression:
D≤35mm；
and D is the clear aperture of the optical imaging module.
Further, the optical imaging module satisfies the following conditional expression:
D＜S；
and S is the longitudinal height of the display screen.
Further, the optical imaging module satisfies the following conditional expression:
H≤25mm；
and H is the axial distance from the image side surface of the first lens to the display screen.
Further, the optical imaging module satisfies the following conditional expression:
F≥80°；
and F is the angle of view of the optical imaging module.
Further, the object-side surface of the third lens element is convex at a paraxial region, and the object-side surface of the third lens element is provided with at least one inflection point.
Furthermore, the fourth-order aspheric surface coefficient of the object side surface of the third lens is-4.80E-05, the sixth-order aspheric surface coefficient is-1.10E-06, and the eighth-order aspheric surface coefficient is-2.40E-09; or;
the fourth-order aspheric surface coefficient of the object side surface of the third lens is 5.00E-05, the sixth-order aspheric surface coefficient is 2.87E-07, and the eighth-order aspheric surface coefficient is-1.11E-09;
further, the image side surface of the second lens is spherical or aspherical.
Further, the object side surface of the second lens is spherical or aspherical.
Another objective of the present invention is to provide a virtual reality device using the above optical imaging module.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
FIG. 1 is a schematic structural diagram of an optical imaging module according to a first embodiment of the present invention;
FIG. 2 is a schematic diagram of an imaging optical path of the optical imaging module according to the first embodiment of the present invention;
FIG. 3 is a graph of the spatial distribution of the optical modulation transfer function of the optical imaging module according to the first embodiment of the present invention;
FIG. 4 is a schematic diagram of an imaging optical path of an optical imaging module according to a second embodiment of the present invention;
FIG. 5 is a graph of the spatial distribution of the optical modulation transfer function of the optical imaging module according to the second embodiment of the present invention.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below. Several embodiments of the invention are presented in the drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. As used herein, the terms "vertical," "horizontal," "left," "right," "up," "down," and the like are for illustrative purposes only and do not indicate or imply that the referenced device or element must be in a particular orientation, constructed or operated in a particular manner, and is not to be construed as limiting the present invention.
In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
The invention provides an optical imaging module, which comprises the following components in sequence from an imaging surface to an object side along an optical axis:
the image side surface of the first lens is an aspheric surface, the object side surface of the first lens is a plane, and the object side surface of the first lens is plated with a polarization beam splitting film;
the image side surface of the second lens can be spherical or aspherical, and the object side surface of the second lens can be spherical or aspherical;
the image side surface of the third lens is a concave aspheric surface, the image side surface of the third lens is plated with a semi-transparent semi-reflective film, and the object side surface of the third lens is a high-order aspheric surface;
a display screen.
In some embodiments, the optical imaging module satisfies the following conditional expression:
D≤35mm；
and D is the clear aperture of the optical imaging module.
In some embodiments, the optical imaging module satisfies the following conditional expression:
D＜S；
and S is the longitudinal height of the display screen, and the conditional expression defines that the clear aperture of the optical imaging module is smaller than the size of the display screen.
In some embodiments, the optical imaging module satisfies the following conditional expression:
H≤25mm；
and H is the axial distance from the image side surface of the first lens to the display screen, namely the thickness of the optical imaging module.
In some embodiments, the optical imaging module satisfies the following conditional expression:
F≥80°；
and F is the angle of view of the optical imaging module.
The invention is further illustrated below in the following examples. The following examples are only preferred embodiments of the present invention, but the embodiments of the present invention are not limited only by the following examples, and any other changes, substitutions, combinations or simplifications which do not depart from the innovative points of the present invention should be construed as being equivalent substitutions and shall be included within the scope of the present invention.
First embodiment
Referring to fig. 1, a schematic structural diagram of an optical imaging module 100 according to a first embodiment of the present invention is shown, in which the optical imaging module 100 sequentially includes, from an imaging surface to an object side along an optical axis: the lens comprises a first lens L1, a second lens L2, a third lens L3 and a display screen D. The object side surface of the first lens L1 is coated with a polarization beam splitting film, and the image side surface of the third lens L3 is coated with a semi-transparent and semi-reflective film.
The object-side surface of the third lens element L3 is convex at a paraxial region, and the object-side surface of the third lens element L3 has at least one inflection point, specifically two inflection points in this embodiment.
The relevant parameters of each lens of the optical imaging module of the present embodiment are shown in table 1.
TABLE 1
It should be noted that reference numerals 1-13 in table 1 indicate the order in which the light paths are transmitted between the display screen and the human eye.
The aspherical surface parameters of each lens of this example are shown in table 2.
TABLE 2
| Noodle | K | a4 | a6 | a8 |
| L1 item side | -137.2 | 0 | 0 | 0 |
| L2 item side | 204.3 | -2.89E-05 | 1.20E-07 | 5.70E-11 |
| L3 image side | 100 | -6.00E-06 | -1.90E-08 | 8.77E-12 |
| L3 item side | -16.7 | -4.80E-05 | -1.10E-06 | -2.40E-09 |
Referring to fig. 2, the imaging optical path is illustrated, in fig. 2, F1, F2, and F3 are object points with different heights on the display screen D, and correspond to different viewing angles at the exit pupil. The object point of F3 corresponds to the edge light-emitting point of the optical imaging module, and since the clear aperture of the optical imaging module is smaller than the size of the display screen, the light emitted from F3 will be incident on the object-side surface of the third lens L3 at a certain inclination angle and refracted again. Taking F1 field of view as an example, a light ray emitted from the display screen D passes through the object-side surface of the third lens L3, which is a high-order aspheric surface type to collect incident light at various angles, then passes through the image-side surface of the third lens L3, where 50% of the light ray is transmitted and continues to participate in imaging, passes through the second lens L2, then is reflected by the polarization splitting film at the object-side surface of the first lens L1, passes through the second lens L2 again, is reflected when entering the image-side surface of the third lens L3 (again, there is a 50% reflection effect), and then passes through the second lens L2 and the first lens L1 in sequence to enter human eyes, so as to form a magnified virtual image effect.
In this embodiment, the object-side surface of the third lens L3 has a relatively large curvature, so that a relatively large angle of light emitted from the large field point F3 can be coupled into the folded cavity of the lens group to realize imaging, and the total clear aperture of the first lens L1, the second lens L2, and the third lens L3 can be effectively reduced.
In this embodiment, the imaging definition sampling of the field points F1, F2, and F3 uses the spatial frequency of 21 log lines/mm of the pixels of the display screen as the cutoff frequency, and the optical transfer function at the position of the design result meets the requirement of human eye resolution definition, and the specific spatial curve is shown in fig. 3. In fig. 3, the F1 field of view corresponds to a half field angle of 0 °, the F2 field of view corresponds to a half field angle of 22 °, and the F3 field of view corresponds to a half field angle of 47 °.
Second embodiment
Referring to fig. 4, an optical imaging module according to a second embodiment of the present invention is substantially the same as the first embodiment except that parameters of each lens are different.
The relevant parameters of each lens of the optical imaging module of the present embodiment are shown in table 3.
TABLE 3
The aspherical surface parameters of each lens of this example are shown in table 4.
TABLE 4
| Noodle | K | a4 | a6 | a8 |
| L1 item side | -160 | 0 | 0 | 0 |
| L2 item side | -1.1 | 1.10E-05 | -9.59E-08 | 7.50E-10 |
| L3 image side | 100 | 3.23E-06 | 3.30E-08 | -2.35E-10 |
| L3 item side | -16.7 | 5.00E-05 | 2.87E-07 | -1.11E-09 |
The spatial distribution curve of the optical modulation transfer function of the optical imaging module of the present embodiment is shown in fig. 5.
Third embodiment
A third embodiment of the present invention provides a virtual reality device, which at least includes the optical imaging module in any of the above embodiments, and the virtual reality device is, for example, a VR helmet or VR glasses.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. An optical imaging module, comprising, in order from an imaging surface to an object side along an optical axis:
the image side surface of the first lens is an aspheric surface, the object side surface of the first lens is a plane, and the object side surface of the first lens is plated with a polarization beam splitting film;
a second lens;
the image side surface of the third lens is a concave aspheric surface, the image side surface of the third lens is plated with a semi-transparent semi-reflective film, and the object side surface of the third lens is a high-order aspheric surface;
a display screen.
2. The optical imaging module of claim 1, wherein the optical imaging module satisfies the following conditional expression:
D≤35mm；
and D is the clear aperture of the optical imaging module.
3. The optical imaging module of claim 2, wherein the optical imaging module satisfies the following conditional expression:
D＜S；
and S is the longitudinal height of the display screen.
4. The optical imaging module of claim 1, wherein the optical imaging module satisfies the following conditional expression:
H≤25mm；
and H is the axial distance from the image side surface of the first lens to the display screen.
5. The optical imaging module of claim 1, wherein the optical imaging module satisfies the following conditional expression:
F≥80°；
and F is the angle of view of the optical imaging module.
6. The optical imaging module of claim 1, wherein the object-side surface of the third lens element is convex at paraxial region, and the object-side surface of the third lens element has at least one inflection point.
7. The optical imaging module of claim 1, wherein:
the fourth-order aspheric surface coefficient of the object side surface of the third lens is-4.80E-05, the sixth-order aspheric surface coefficient is-1.10E-06, and the eighth-order aspheric surface coefficient is-2.40E-09; or;
and the fourth-order aspheric surface coefficient of the object side surface of the third lens is 5.00E-05, the sixth-order aspheric surface coefficient is 2.87E-07, and the eighth-order aspheric surface coefficient is-1.11E-09.
8. The optical imaging module of claim 1 wherein the image-side surface of the second lens is spherical or aspherical.
9. The optical imaging module of claim 1 wherein the object side surface of the second lens is spherical or aspherical.
10. A virtual reality device comprising the optical imaging module of any one of claims 1-9.
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| CN202011401339.4A CN112433343A (en) | 2020-12-03 | 2020-12-03 | Optical imaging module and virtual reality equipment |
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| CN202011401339.4A CN112433343A (en) | 2020-12-03 | 2020-12-03 | Optical imaging module and virtual reality equipment |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114236830A (en) * | 2021-11-30 | 2022-03-25 | 歌尔光学科技有限公司 | Optical system and head-mounted display equipment |
| CN114280783A (en) * | 2021-12-22 | 2022-04-05 | 上海摩软通讯技术有限公司 | Optical module and VR equipment |
| CN114675419A (en) * | 2022-03-16 | 2022-06-28 | 江西凤凰光学科技有限公司 | Near-to-eye virtual reality optical module |
| WO2023221239A1 (en) * | 2022-05-19 | 2023-11-23 | 歌尔光学科技有限公司 | Optical module and head-mounted display device |
| WO2024021510A1 (en) * | 2022-07-27 | 2024-02-01 | 北京凌宇智控科技有限公司 | Optical lens module and virtual reality device |
| WO2024131877A1 (en) * | 2022-12-22 | 2024-06-27 | 宁波舜宇光电信息有限公司 | Projection module |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2024131877A1 (en) * | 2022-12-22 | 2024-06-27 | 宁波舜宇光电信息有限公司 | Projection module |
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Application publication date: 20210302 |