CN114755830A - Optical amplification module and VR display equipment with same - Google Patents
Optical amplification module and VR display equipment with same Download PDFInfo
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- CN114755830A CN114755830A CN202210433945.7A CN202210433945A CN114755830A CN 114755830 A CN114755830 A CN 114755830A CN 202210433945 A CN202210433945 A CN 202210433945A CN 114755830 A CN114755830 A CN 114755830A
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- 230000003287 optical effect Effects 0.000 title claims abstract description 133
- 230000003321 amplification Effects 0.000 title claims abstract description 28
- 238000003199 nucleic acid amplification method Methods 0.000 title claims abstract description 28
- 230000014509 gene expression Effects 0.000 claims abstract description 12
- 239000000463 material Substances 0.000 claims description 15
- 238000010521 absorption reaction Methods 0.000 claims description 14
- 238000000034 method Methods 0.000 abstract description 9
- 238000012545 processing Methods 0.000 description 3
- 238000013461 design Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000037303 wrinkles Effects 0.000 description 2
- 239000002313 adhesive film Substances 0.000 description 1
- 230000003190 augmentative effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000003384 imaging method Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 238000003856 thermoforming Methods 0.000 description 1
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- 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
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Abstract
The invention provides an optical amplification module and VR (virtual reality) display equipment with the same, wherein the optical amplification module comprises a first lens and a second lens, wherein the first lens is provided with a first optical surface S1 and a second optical surface S2; the second lens is provided with a third optical surface S3 and a fourth optical surface S4; the first optical surface S1 is a first polynomial surface, and the expression of the first polynomial surface is: z is a.x ^ n, and the second optical surface S2 is a plane; the third optical surface S3 is a first free-form surface, the fourth optical surface S4 is a second free-form surface, and at least 2 protruding parts are protruded on the first free-form surface and the second free-form surface, so that the first free-form surface and the second free-form surface are non-arc surfaces; the first free-form surface and the second free-form surface are provided with a first central point and a second central point which are collinear with an optical axis of the optical amplification module, and after the technical scheme is adopted, the difficulty of the traditional curved surface film pasting process which is an arc surface can be reduced.
Description
Technical Field
The invention relates to the field of optical equipment, in particular to an optical amplification module and VR (virtual reality) display equipment with the same.
Background
With the development and upgrade of optical design and processing technology, display technology and processors, the shapes and types of head-mounted display products such as VR (Virtual Reality), AR (augmented Reality) and the like are varied, and their application fields are also becoming more and more extensive.
In the correlation technique, wear the optical module who shows the product and be located between display and user's the eye, optical module includes a plurality of optical lens, and these optical lens carry out many times refraction and reflection to the image that the display shows to enlarge the image that the display shows, make people's eye can observe the image after the optical module enlargies. In the process, the optical path of the optical path in the head-mounted display product is long, and the thickness from the human eye side to the display side of the whole head-mounted display product is large, so that the head-mounted display product has a large size, and a user can wear the product to bring more burden.
Therefore, many manufacturers have proposed an optical structure for realizing a large-field, thin, and high-definition virtual reality display by sequentially arranging a first absorption type polarizer, a reflection type polarizer, a first phase retarder, a special surface type lens, a free-form surface lens coated (attached) with a semi-reflective and semi-transmissive film, a second phase retarder, a second absorption type polarizer, a display source, and the like in front of human eyes.
In the above configuration, however, the reflective polarizer is attached either on a planar surface or on a non-planar surface. In the current non-planar attachment scheme, most of the non-planar attachment schemes are rotationally symmetric or non-rotationally symmetric surface types with a certain vertex, such as spherical surfaces, aspheric surfaces, and the like, and when the film material is attached to the surfaces, the film material needs to be subjected to processes such as thermoforming, pressing, bubble removal, and the like, so that the technical difficulty is high, and the performance of the film material in the reliability test is poor.
Therefore, an optical amplifying module with low processing difficulty is needed.
Disclosure of Invention
In order to overcome the technical defects, the invention aims to provide an optical amplification module and a VR display device with the optical amplification module, which can reduce the difficulty of the traditional cambered surface film pasting process.
The invention discloses an optical magnification module, which comprises a first lens and a second lens which are sequentially arranged, wherein the first lens is provided with a first optical surface S1 far away from the second lens and a second optical surface S2 facing the second lens;
the second lens has a third optical surface S3 facing the first lens and a fourth optical surface S4 far away from the first lens;
the first optical surface S1 is a first polynomial surface, and the expression of the first polynomial surface is: z ═ a · x ^ n, where n is an even number, a ∈ (-0.01, 0) U (0, 0.01);
The second optical surface S2 is a plane;
the third optical surface S3 is a first free-form surface which is respectively symmetrical about the X axis and the Y axis of the optical amplification module, the fourth optical surface S4 is a second free-form surface which is respectively symmetrical about the X axis and the Y axis of the optical amplification module, and at least 2 convex parts are arranged on the first free-form surface and the second free-form surface in a protruding mode, so that the first free-form surface and the second free-form surface are non-arc surfaces;
the first free-form surface and the second free-form surface have a first central point and a second central point which are collinear with an optical axis of the optical amplification module.
Preferably, at least one of the radius of curvature, the aspherical surface K value, and at least one polynomial coefficient in the free-form surface expression of the first free-form surface and the second free-form surface is different.
Preferably, the coefficient of the odd-order term of the x argument and the y argument in the free-form surface expressions of the first free-form surface and the second free-form surface is 0.
Preferably, the second lens has a center thickness of 1mm to 15mm and an edge thickness of greater than 1 mm.
Preferably, when the center thickness is greater than or equal to the edge thickness, the thickness-to-thickness ratio of the center thickness to the edge thickness is less than 7: 1;
when the center thickness is less than the edge thickness, the thickness-to-thickness ratio of the center thickness to the edge thickness should be greater than 1: 7.
Preferably, the first optical surface S1 has attached thereto: the reflection polarizer and the quarter-wave plate are combined into a two-in-one film material, or the absorption polarizer, the reflection polarizer and the quarter-wave plate are combined into a three-in-one film material, or the reflection polarizer, the quarter-wave plate and the antireflection film are combined into a three-in-one film material, or one of the absorption polarizer, the reflection polarizer, the quarter-wave plate and the antireflection film is combined into a four-in-one film material;
an antireflection film is attached to or evaporated on the second optical surface S2;
an antireflection film is evaporated on the third optical surface S3;
the fourth optical surface S4 is evaporated with a transflective film.
Preferably, the first optical surface S1 has attached thereto: the non-planar reflective polarizer, or the absorption polarizer and the reflective polarizer, or the reflection polarizer and the antireflection film, or the absorption polarizer, the reflection polarizer and the antireflection film;
the second optical surface S2 has a quarter wave plate attached thereto;
an antireflection film is evaporated on the third optical surface S3;
the fourth optical surface S4 is evaporated with a transflective film.
The invention also discloses VR display equipment which comprises the optical amplification module and a display screen, wherein the display screen is perpendicular to the optical axis and is arranged on one side, close to the fourth optical surface S4, of the optical amplification module.
After the technical scheme is adopted, compared with the prior art, the method has the following beneficial effects:
1. the difficulty of the traditional film sticking process for the arc-shaped curved surface is reduced, and the condition that wrinkles appear after film sticking is avoided;
2. through the use and optimization of the special-surface lens and the free-form-surface lens, the optical amplification module achieves higher MTF and display effect.
Drawings
FIG. 1 is a YOZ cross-sectional view of an optical magnification module in accordance with a preferred embodiment of the present invention;
FIG. 2 is a cross-sectional view of an XOZ module according to a preferred embodiment of the invention.
Reference numerals are as follows:
10-a first lens;
20-a second lens.
Detailed Description
The advantages of the invention are further illustrated in the following description of specific embodiments in conjunction with the accompanying drawings.
Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The implementations described in the exemplary embodiments below are not intended to represent all implementations consistent with the present disclosure. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the present disclosure, as detailed in the appended claims.
The terminology used in the disclosure is for the purpose of describing particular embodiments only and is not intended to be limiting of the disclosure. As used in this disclosure and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It should also be understood that the term "and/or" as used herein refers to and encompasses any and all possible combinations of one or more of the associated listed items.
It is to be understood that although the terms first, second, third, etc. may be used herein to describe various information, such information should not be limited to these terms. These terms are only used to distinguish one type of information from another. For example, first information may also be referred to as second information, and similarly, second information may also be referred to as first information, without departing from the scope of the present disclosure. The word "if" as used herein may be interpreted as "at … …" or "when … …" or "in response to a determination", depending on the context.
In the description of the present invention, it is to be understood that the terms "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are used merely for convenience of description and for simplicity of description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, are not to be construed as limiting the present invention.
In the description of the present invention, unless otherwise specified and limited, it should be noted that the terms "mounted," "connected," and "connected" are to be interpreted broadly, and may be, for example, a mechanical connection or an electrical connection, a communication between two elements, a direct connection, or an indirect connection through an intermediate medium, and those skilled in the art will understand the specific meaning of the terms as they are used in the specific case.
In the following description, suffixes such as "module", "part", or "unit" used to indicate elements are used only for facilitating the description of the present invention, and do not have a specific meaning per se. Thus, "module" and "component" may be used in a mixture.
Referring to fig. 1 and 2, in order to optimize the film attaching process of the lens in the optical magnifying module and optimize the display effect of the special-face lens, a novel optical magnifying module is provided, which includes a first lens 10 and a second lens 20 facing the eyes of the user and sequentially arranged, wherein the first lens 10 and the second lens 20 respectively reflect and refract the light generated by a light source for multiple times, and then fold the light path to reduce the light path, thereby reducing the size of the optical magnifying module. Specifically, a direction of an optical axis of the optical magnification module along the first lens 10 and the second lens 20 is defined as a z-axis, a direction perpendicular to the z-axis and substantially close to horizontal is defined as an x-axis, and a direction perpendicular to the z-axis and substantially close to vertical is defined as a y-axis. The first lens 10 has a first optical surface S1 distant from the second lens 20, a second optical surface S2 facing the second lens 20, and the second lens 20 has a third optical surface S3 facing the first lens 10, and a fourth optical surface S4 distant from the first lens 10. The first optical surface S1 is a first polynomial surface, and the expression of the first polynomial surface is: z ═ a · x ^ n, where n is an even number, a ∈ (-0.01, 0) U (0, 0.01), by configuring the first optical surface S1 to have a certain coefficient and only x term without y term, the first optical surface S1 is made symmetrical about the x axis, that is, the first optical surface S1 has no "wavy" surface type in the case of not being planar, and no wrinkle occurs after the film is attached thereon.
In a preferred embodiment, the rise of the first polynomial surface is defined as:
z＝γ1x2+γ2x4+γ3x6+γ4x8+γ5y2+γ6y4+γ7y6+γ8y8。
the second optical surface S2 is a plane, the third optical surface S3 is a first free-form surface that is symmetric about the X-axis and the Y-axis of the optical amplification module, respectively, the fourth optical surface S4 is a second free-form surface that is symmetric about the X-axis and the Y-axis of the optical amplification module, respectively, and at least 2 protrusions are protruded on the first free-form surface and the second free-form surface, so that the first free-form surface and the second free-form surface are non-arc surfaces, in other words, the surfaces of the third optical surface S3 and the fourth optical surface S4 may be protruded, and the positions of the protrusions are random, so that the surface types of the first free-form surface and the second free-form surface have freedom (but still need to be symmetric about the X-axis and the Y-axis), and further, the first free-form surface and the second free-form surface are non-arc surfaces means that when the third optical surface S3 and the fourth optical surface S4 rotate around the central point, a certain angle is needed to be rotated to completely coincide with the original surface type, but the non-form surface type or the arc surface type, the shape of the rotary shaft can be completely overlapped with the original surface shape by any angle. Thus, there is no loss of transmission during optical design, processing and setup. In general, the formula expression of the surface TYPEs of the third optical surface S3 and the fourth optical surface S4 may be zernike polynomials, bezier surfaces, B-spline surfaces, Q-TYPE surfaces, or the like.
Furthermore, the first free-form surface and the second free-form surface are provided with a first central point and a second central point which are collinear with an optical axis of the optical amplification module, so that final imaging does not need to be adjusted, and the symmetry of human eyes is matched.
In a preferred embodiment, when the surface types of the first free-form surface and the second free-form surface are expressed in the form of extended polynomial, at least one of the curvature radius, the aspheric K value, and at least one polynomial coefficient in the expression of the free-form surface is different, so that the third optical surface S3 and the fourth optical surface S4 do not completely coincide with each other, and the final interconversion form between the surface types of the third optical surface S3 and the fourth optical surface S4 and the expression is a criterion, for example, the other surface types are converted into the form of extended XY polynomial in some way; or, in terms of the symmetry of its final surface.
Further, the coefficients of the odd terms of the X-argument and the Y-argument in the free-form surface expressions of the first free-form surface and the second free-form surface are 0 to satisfy the plane shape symmetrical about the X axis and the Y axis.
In a preferred embodiment, the second lens 20 is configured to have a center thickness of 1mm to 15mm and an edge thickness greater than 1mm for the dimensions. And further, when the center thickness is equal to or greater than the edge thickness, the thickness ratio of the center thickness to the edge thickness is less than 7:1, more preferably, in a ratio of 3: 1 or less is excellent; when the center thickness is less than the edge thickness, the thickness ratio of the center thickness to the edge thickness should be greater than 1: 7, more preferably, in a ratio of 1: the preferred is 3 or more.
The surface adhesive films of the first optical surface S1, the second optical surface S2, the third optical surface S3 and the fourth optical surface S4 can be selected as follows: the first optical surface S1 has attached thereto: the reflection polarizer and the quarter-wave plate are combined into a two-in-one film material, or the absorption type polarizer, the reflection polarizer and the quarter-wave plate are combined into a three-in-one film material, or the reflection polarizer, the quarter-wave plate and the antireflection film are combined into a three-in-one film material, or one of the absorption type polarizer, the reflection polarizer, the quarter-wave plate and the antireflection film is combined into a four-in-one film material; the second optical surface S2 is attached with or evaporated with an anti-reflection film; an anti-reflection film is evaporated on the third optical surface S3; the fourth optical surface S4 is evaporated with a transflective film.
In another embodiment, it may be configured to: the first optical surface S1 has attached thereto: the non-planar reflective polarizer, or the absorption polarizer and the reflective polarizer, or the reflection polarizer and the antireflection film, or the absorption polarizer, the reflection polarizer and the antireflection film; the second optical surface S2 has a quarter wave plate attached thereto; an antireflection film is evaporated on the third optical surface S3; the fourth optical surface S4 is evaporated with a transflective film.
After having the optical amplification module in any of the above embodiments, can be applied to the VR display device in, the VR display device further includes a display screen, and the display screen is placed perpendicular to the optical axis and is disposed on one side of the optical amplification module close to the fourth optical surface S4.
It should be noted that the embodiments of the present invention have been described in a preferred embodiment and not limited to the embodiments, and those skilled in the art may modify and modify the above-disclosed embodiments to equivalent embodiments without departing from the scope of the present invention.
Claims (8)
1. An optical magnification module comprises a first lens and a second lens arranged in sequence,
the first lens has a first optical surface S1 far away from the second lens, a second optical surface S2 facing the second lens;
the second lens has a third optical surface S3 facing the first lens, a fourth optical surface S4 away from the first lens;
the first optical surface S1 is a first polynomial surface, and the expression of the first polynomial surface is: z ═ a · x ^ n, where n is an even number, a ∈ (-0.01, 0) U (0, 0.01);
The second optical surface S2 is a plane;
the third optical surface S3 is a first free-form surface symmetric about the X-axis and the Y-axis of the optical amplification module, respectively, the fourth optical surface S4 is a second free-form surface symmetric about the X-axis and the Y-axis of the optical amplification module, respectively, and at least 2 protrusions are protruded on the first free-form surface and the second free-form surface, so that the first free-form surface and the second free-form surface are non-arc surfaces;
the first free-form surface and the second free-form surface are provided with a first central point and a second central point which are collinear with an optical axis of the optical amplification module.
2. The optical amplification module of claim 1,
at least one of the radius of curvature, the aspherical K value, and at least one polynomial coefficient in the free-form surface expression of the first free-form surface and the second free-form surface is different.
3. The optical amplification module of claim 2,
and the coefficient of the odd-order term of the x independent variable and the y independent variable in the free-form surface expression of the first free-form surface and the second free-form surface is 0.
4. The optical amplification module of claim 3,
The center thickness of the second lens is 1mm-15mm, and the edge thickness is larger than 1 mm.
5. The optical amplification module of claim 4,
when the center thickness is greater than or equal to the edge thickness, the thickness ratio of the center thickness to the edge thickness is less than 7: 1;
when the center thickness is less than the edge thickness, the thickness-to-thickness ratio of the center thickness to the edge thickness should be greater than 1: 7.
6. the optical amplification module of claim 1,
the first optical surface S1 has attached thereto: the reflection polarizer and the quarter-wave plate are combined into a two-in-one film material, or the absorption polarizer, the reflection polarizer and the quarter-wave plate are combined into a three-in-one film material, or the reflection polarizer, the quarter-wave plate and the antireflection film are combined into a three-in-one film material, or one of the absorption polarizer, the reflection polarizer, the quarter-wave plate and the antireflection film is combined into a four-in-one film material;
an antireflection film is attached to or evaporated on the second optical surface S2;
an antireflection film is evaporated on the third optical surface S3;
the fourth optical surface S4 is evaporated with a transflective film.
7. The optical amplification module of claim 1,
the first optical surface S1 has attached thereto: the non-planar reflective polarizer, or the absorption polarizer and the reflective polarizer, or the reflection polarizer and the antireflection film, or the absorption polarizer, the reflection polarizer and the antireflection film;
A quarter-wave plate is attached to the second optical surface S2;
an anti-reflection film is evaporated on the third optical surface S3;
the fourth optical surface S4 is evaporated with a semi-reflecting and semi-permeable film.
8. A VR display device comprising an optical magnifying module according to any one of claims 1 to 7, further comprising a display screen disposed perpendicular to the optical axis and on a side of the optical magnifying module proximate to the fourth optical surface S4.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210329267X | 2022-03-30 | ||
| CN202210329267 | 2022-03-30 |
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| CN114755830A true CN114755830A (en) | 2022-07-15 |
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| CN113419349A (en) * | 2021-06-03 | 2021-09-21 | 歌尔光学科技有限公司 | Optical module and head-mounted display |
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| CN214751119U (en) * | 2021-06-28 | 2021-11-16 | 歌尔光学科技有限公司 | Optical module and head-mounted display device |
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2022
- 2022-04-24 CN CN202210433945.7A patent/CN114755830A/en active Pending
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| CN208156319U (en) * | 2018-05-03 | 2018-11-27 | 深圳创维新世界科技有限公司 | Optics module and system are amplified in short distance |
| US20210199969A1 (en) * | 2019-12-31 | 2021-07-01 | Seeya Optronics Co., Ltd. | Arugmented reality optical module and augmented reality apparatus |
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Application publication date: 20220715 |