CN114280783B - Optical module and VR equipment - Google Patents
Optical module and VR equipment Download PDFInfo
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- CN114280783B CN114280783B CN202111581926.0A CN202111581926A CN114280783B CN 114280783 B CN114280783 B CN 114280783B CN 202111581926 A CN202111581926 A CN 202111581926A CN 114280783 B CN114280783 B CN 114280783B
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Abstract
The invention discloses an optical module, which comprises a first lens, a second lens and a third lens which are sequentially arranged in parallel from left to right along a main optical axis, and a display panel for providing an incident polarized light source, wherein the first lens is a concave lens, the second lens and the third lens are both convex lenses, the display panel is of a flat plate structure, and the left side surface of the first lens is also in a surface shape and is adhered with a polarized reflecting film. The optical module adopts a simple three-lens structural design, so that a three-section type folded optical path is formed, the transmission amplification and the freedom degree of an image are effectively improved, and the improvement of the field angle, the light and thin structural design and the high-quality three-dimensional imaging effect are realized. In addition, VR equipment that has this optical module is still disclosed.
Description
Technical Field
The present disclosure relates to optical assemblies, and particularly to an optical module and a VR device using the optical module.
Background
In VR (Virtual Reality) products, the optical module is the most core display component, including a VR display screen (display) and a VR lens. The Display is used as an imaging element of an optical module, and a virtual image is presented in human eyes through a VR lens
In order to provide a good user experience, the current optical module is developed toward a light and thin direction. However, in order to achieve a better field angle, a better eye movement range, a high-quality imaging effect, a small-sized ultra-thin structure, and the like, the current optical module needs to be further optimized.
With the advancement of science and technology, users pay more and more attention to the size and weight of VR products, and therefore, the VR products with small size and light weight need to be developed to meet the market demands. Wherein, the most restricted factor is the optical module among them, and the optical module among the existing product all adopts ultra-thin type VR optical module. The ultrathin VR optical module mostly uses a folding light path technology, and a polarizing film, a phase delay film and a lens are generally attached to one side close to eyes, so that the reflection and transmission functions in a light path are realized; the thickness of most of the existing VR optical modules is 40mm or more. In the prior art, during the manufacturing process, the polarizer is generally plated on the lens surface by a film plating process, while the plating of the polarizer on the convex lens has one less degree of freedom in design, and if the degree of freedom is increased, a flat plate must be introduced to plate the polarizer thereon or add the lens, which results in the increase of the whole thickness and volume.
Therefore, an optical module with a novel structure, a small size and a thin thickness is needed.
Disclosure of Invention
The invention aims to provide an optical module which is novel in structure, light and thin.
Another object of the present invention is to provide a VR device having a novel and light optical module, so that the VR device is easy to wear, has a good three-dimensional effect, and is easy to manufacture.
In order to achieve the above object, the present invention provides an optical module, which includes a first lens, a second lens, a third lens and a display panel for providing an incident polarized light source, wherein the first lens, the second lens and the third lens are sequentially arranged in parallel from left to right along a main optical axis, the first lens is a concave lens, the second lens and the third lens are both convex lenses, the display panel is of a flat plate structure, and a polarized reflective film is attached to the left side surface of the first lens in a surface shape; .
Preferably, the optical module further includes a wave plate, and the wave plate is attached to the right side surface of the first lens in a surface shape.
Preferably, the optical module of the present invention satisfies the following conditional expression:
F＜|f1|＜4F；
0.1F＜|f2|＜0.5F；
4F＜|f3|＜10F；
and F is the system focal length of the optical module, F1 is the focal length of the first lens, F2 is the focal length of the second lens, and F3 is the focal length of the third lens.
The focal lengths of the first lens and the third lens which are positioned at the outermost sides of the three lenses are far larger than that of the second lens, so that the surface types of the first lens and the third lens are more straight compared with that of the second lens, and the thicknesses of the first lens and the third lens and the total optical path of the whole optical module are effectively reduced; meanwhile, the bent part of the bent second lens can extend into the bent area of the third lens, so that the thickness of the lens and the total optical path of the whole optical module are further reduced. Therefore, the light and thin and three-dimensional imaging effect of the optical module is improved.
Preferably, the optical module of the present invention satisfies the following conditional expression:
Preferably, the optical module of the present invention satisfies the following conditional expression:
Preferably, the optical module of the present invention satisfies the following conditional expression:
The thickness of the first lens and the third lens which are positioned at the outermost sides of the three lenses is set to be much smaller than that of the second lens, so that the transmission and amplification functions of the second lens are enhanced, and the first lens and the third lens can be designed to be light and thin; the thicknesses of the first lens and the third lens and the total optical path of the whole optical module are effectively reduced; meanwhile, the stereo imaging effect is better, and the field angle and the degree of freedom are improved.
Preferably, the optical module of the present invention satisfies the following conditional expression:
Preferably, in the optical module of the present invention, a distance between the first lens element and the second lens element on the main optical axis is 1.0mm, a distance between the second lens element and the third lens element on the main optical axis is 2.0mm, and a distance between the third lens element and the display panel on the main optical axis is 3.0mm.
Preferably, in the optical module of the present invention, the thickness of the first lens element on the main optical axis is 2.6mm, the thickness of the second lens element on the main optical axis is 5.8mm, the thickness of the third lens element on the main optical axis is 2.0mm, and the thickness of the display panel on the main optical axis is 0.4mm.
Preferably, the optical module of the present invention has an optical path length of 18.4mm.
The VR equipment provided by the invention comprises any one of the optical modules.
Compared with the prior art, the invention provides a brand-new optical module which is sequentially provided with a first lens, a second lens, a third lens and a display panel in parallel arrangement from left to right along a main optical axis, wherein the first lens is a concave lens, a polarization reflecting film is attached to the left side surface of the first lens in a surface-contact manner, the second lens and the third lens are convex lenses, and the display panel provides an incident polarization light source. Therefore, the optical module adopts a simple three-lens structural design, so that a three-section type folded optical path is formed, the transmission amplification and the freedom degree of an image are effectively improved, and the improvement of the field angle, the light and thin structural design and the high-quality three-dimensional imaging effect are realized. Simultaneously, make the VR equipment volume that has this optical module littleer, the quality is lighter, image display effect is better and simple structure is novel, and the three-dimensional sense of immersing is stronger and wears easily, does not have tired sense and portable and easily production manufacturing, and the practicality is strong and is suitable for extensive popularization and application.
Drawings
FIG. 1 is a block diagram of an optical module according to the present invention.
Fig. 2a is a light path diagram of the optical module of the present invention.
Fig. 2b is a schematic diagram of the optical path of the optical module of the present invention.
FIG. 3 is a graph of the MTF of one quarter of nyp for an optical module of the present invention.
FIG. 4 is a graph of the MTF of one-half of the nyp of the optical module of the present invention.
FIG. 5 is a graph of MTF for all npys of the optical module of the present invention.
FIG. 6 is a graph of relative illumination of the optical module according to the present invention.
FIG. 7 is a graph of field curvature of an optical module of the present invention.
FIG. 8 is a distortion plot of an optical module of the present invention.
Detailed Description
Embodiments of the present invention will now be described with reference to the drawings, wherein like element numerals represent like elements.
As shown in fig. 1-2 b, the optical module 100 of the present invention includes a first lens 10, a second lens 20, a third lens 30, and a display panel 40 for providing an incident polarized light source, which are sequentially arranged in parallel from left to right along a main optical axis 200, wherein the first lens is a concave lens, the second lens 20 and the third lens 30 are both convex lenses, the display panel 40 is a flat plate structure, and a polarization reflective film 50 is attached to the left side surface of the first lens 10 in a surface shape. The first lens 10 of the present invention is a concave mirror having a transmission magnifying function to magnify the image of the display panel 40. The second lens element 20 and the third lens element 30 are both convex mirrors, and both have a transmission magnifying function. The display panel 40 of the present invention is used for generating polarized light and providing an incident circularly polarized light or elliptically polarized light source for the optical module 100 of the present invention. As can be seen from the above, the optical module 100 of the present invention includes a first lens 10, a second lens 20, a third lens 30 and a display panel 40 arranged in parallel from left to right along a main optical axis 200, the first lens 10 is a concave mirror and a polarization reflective film 50 is further attached to a left side surface of the concave mirror, the second lens 20 and the third lens 30 are both convex lenses, and the display panel 40 provides an incident polarization light source. Therefore, the optical module 100 of the present invention adopts a simple three-lens structure design, so as to form a three-segment folded optical path, effectively improve the design of transmission amplification and freedom degree of an image, and realize the improvement of a field angle, a light and thin structure design and a high-quality stereoscopic imaging effect. Simultaneously, make the VR equipment volume that has this optical module 100 littleer, the quality is lighter, image display effect is better and simple structure is novel, and the three-dimensional sense of immersing is stronger and wears lightly, does not have tired sense and portable and easily production manufacturing, and the practicality is strong and is suitable for extensive popularization and application. The optical module 100 and the VR device with the optical module 100 according to the present invention will be described in detail with reference to fig. 1 to 8.
The optical module of the present invention further includes a wave plate 60 by increasing the optical path difference (i.e., phase difference) of the three-segment folded optical path, wherein the wave plate 60 is attached to the right side surface of the first lens 10 in a planar manner. The optical path difference (i.e., phase difference) of the three-segment folded optical path is increased by adding the wave plate 60, so that the imaging effect of the optical module 100 of the present invention is improved.
Preferably, the optical module of the present invention satisfies the following conditional expression:
f < F1 < 4F;0.1F < | F2| < 0.5F;4F < | F3| < 10F; and F is the system focal length of the optical module, F1 is the focal length of the first lens, F2 is the focal length of the second lens, and F3 is the focal length of the third lens. The focal lengths of the first lens 10 and the third lens 20 positioned at the outermost sides of the three lenses are set to be far greater than the focal length of the second lens 20, so that the surface types of the first lens 10 and the third lens 30 are flatter and straighter than the surface type of the second lens 20, and the thicknesses of the first lens 10 and the third lens 30 and the total optical path of the whole optical module are effectively reduced; and meanwhile, the bent part of the bent second lens 20 can extend into the bent area of the third lens, so that the thickness of the lenses and the total optical path of the whole optical module are further reduced. Therefore, the light and thin and three-dimensional imaging effect of the optical module is improved.
Preferably, the optical module of the present invention satisfies the following conditional expression:
Preferably, the optical module of the present invention satisfies the following conditional expressions:
Preferably, the optical module of the present invention satisfies the following conditional expressions:
As can be seen from the above relations regarding Σ CT and Σ CT1, Σ CT2, and Σ CT3, the thickness of the first lens 10 and the third lens 30 located at the outermost sides of the three lenses is set to be much smaller than the thickness of the second lens 20, so that the transmission magnifying function of the second lens 20 is enhanced, and the first lens 10 and the third lens 30 can be designed to be thin and thin; the thicknesses of the first lens 10 and the third lens 30 and the total optical path of the whole optical module are effectively reduced; meanwhile, the stereo imaging effect is better, and the field angle and the degree of freedom are improved.
Preferably, the optical module of the present invention satisfies the following conditional expressions:
As shown in fig. 1-2 b, in the optical module 100 of the present invention, a distance between the first lens element 10 and the second lens element 20 on the main optical axis 200 is 1.0mm, a distance between the second lens element 20 and the third lens element 30 on the main optical axis is 2.0mm, and a distance between the third lens element 30 and the display panel 40 on the main optical axis is 3.0mm. More specifically, the thickness of the first lens element 10 on the main optical axis 200 of the optical module 100 of the present invention is 2.6mm, the thickness of the second lens element 20 on the main optical axis 200 is 5.8mm, the thickness of the third lens element 30 on the main optical axis 200 is 2.0mm, and the thickness of the display panel 40 on the main optical axis 200 is 0.4mm. Further, the optical module 100 of the present invention has an optical path total length of 18.4mm, so that the thickness of the optical module of the present invention is reduced to less than 20mm, which is far lower than the existing 40mm, and the design features of light weight and thinness are outstanding.
The working principle of the present invention will be explained in detail with reference to fig. 1-2 b: the display panel 40 emits circularly polarized light or elliptically polarized light E1, the circularly polarized light or elliptically polarized light E1 is transmitted through the third lens 30 and the second lens 20, the linearly polarized light E2 is converted into a linearly polarized light beam E2 through the wave plate 60, the linearly polarized light beam E2 is transmitted through the first lens 10 and the wave plate 60 and then enters the polarization reflection film 40, the polarization direction of the polarization reflection film 40 is orthogonal to the polarization direction of the linearly polarized light beam E2, the linearly polarized light beam E2 is reflected by the polarization reflection film 40, the circularly polarized light or elliptically polarized light E3 is transmitted again through the first lens 10 and the wave plate 60 and converted into circularly polarized light or elliptically polarized light E3, the circularly polarized light or elliptically polarized light E4 is reflected out through the second lens 20 and the third lens 30 and then converted into the circularly polarized light or elliptically polarized light E5, the linearly polarized light beam E5 is transmitted for the third time through the third lens 30, the second lens 20 and the wave plate 60 and then enters the human eye 300 through the polarization reflection film 40, and the polarization direction of the linearly polarized light beam E5 is the human eye 300, and the polarization direction of the linearly polarized light beam E5 is the polarization reflection film 40, and therefore the linearly polarized light beam E5 can enter the human eye 300 through the polarization reflection film 40.
Specifically, the system focal length F of the optical system of the optical module 100 of the present invention is 5.0. The maximum half field angle is set to 45 degrees, the maximum full field angle is set to 90 degrees, and the three values of 0.486um, 587um and 0.656um are sequentially set for the wavelength. More specifically, the focal length f1 of the first lens 10 of the present invention is-78.117 mm, the radius of curvature of the left side surface R11 of the first lens 10 is-44.436 mm, the radius of curvature of the right side surface R12 of the first lens 10 is + ∞, and the first lens 10 is constructed from H-ZK1. The focal length f2 of the second lens 20 is 11.862mm, the radius of curvature of the left side surface R21 of the second lens 20 is-694.381 mm, the radius of curvature of the right side surface R22 of the second lens 20 is-32.695 mm, wherein the surface R22 is plated with a half-transparent and half-reflective film, and the construction material of the second lens 20 is H-QK1. The equivalent focal length f3 of the third lens 30 is 115.951mm, the curvature radius of the left side surface R31 of the third lens 30 is-72.352 mm, the curvature radius of the right side surface R32 of the third lens 30 is-35.196 mm, and the third lens 30 is made of H-ZK1. The display panel 40 of the present invention is made of BK7. The above mentioned materials H-ZK1, H-QK1 and BK7 are conventional materials, and are known to those skilled in the art, and will not be described herein.
As shown in fig. 3-5, the MTF curves at quarter nyp, half nyp, and full nyp of the present invention are given at the main optical axis (i.e., TS0.00 (deg)), 5 degrees (i.e., TS5.00 (deg)), 10 degrees (i.e., TS10.00 (deg)), 15 degrees (i.e., TS15.00 (deg)), 20 degrees (i.e., TS20.00 (deg)), 25 degrees (i.e., TS25.00 (deg)), 30 degrees (i.e., TS30.00 (deg)), and 35 degrees (i.e., TS35.00 (deg)), respectively. In combination with the relative illumination curve shown in fig. 6, it can be seen that the optical module of the present invention can achieve high definition in the whole field of view.
As shown in fig. 7 and 8, a field curve and a distortion curve of the optical module 100 of the present invention are respectively shown; as can be seen from FIG. 7, the field curvature of the optical module 100 of the present invention is well corrected; as can be seen from fig. 8, the optical module 100 of the present invention has a better imaging effect and a better distortion correction.
The principles of optical transmission, reflection and polarization according to the present invention are well known to those skilled in the art and will not be described in detail herein.
The above disclosure is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the scope of the present invention, therefore, the present invention is not limited by the appended claims.
Claims (9)
1. An optical module is characterized by comprising a first lens, a second lens and a third lens which are sequentially arranged in parallel from left to right along a main optical axis, and a display panel for providing an incident polarized light source, wherein the first lens is a concave lens, the second lens and the third lens are both convex lenses, the display panel is of a flat plate structure, and the left side surface of the first lens is also in a surface shape and is attached with a polarized reflecting film; the optical module satisfies the following conditional expression:
wherein, F is the system focal length of the optical module, R11 is the radius of curvature of the left side of the first lens, and R22 is the radius of curvature of the right side of the second lens; r31 is a radius of curvature of the left side surface of the third lens, and R32 is a radius of curvature of the right side surface of the first lens.
2. The optical module of claim 1 further comprising a wave plate surface mounted to the right side of the first lens.
3. The optical module of claim 1 wherein the optical module satisfies the following conditional expression:
F＜|f1|＜4F；
0.1F＜|f2|＜0.5F；
4F＜|f3|＜10F；
wherein, F is the system focal length of the optical module, F1 is the focal length of the first lens, F2 is the focal length of the second lens, and F3 is the focal length of the third lens.
4. The optical module of claim 1 wherein the optical module satisfies the following conditional expression:
sigma CT1 is the thickness of the first lens on the main optical axis, and sigma CT is the sum of the thicknesses of the first lens, the second lens, the third lens and the display panel on the main optical axis.
5. The optical module of claim 2, wherein the optical module satisfies the following conditional expression:
sigma CT2 is the thickness of the second lens on the main optical axis, and sigma CT is the sum of the thicknesses of the polarization reflecting film, the first lens, the wave plate, the second lens, the third lens and the display panel on the main optical axis.
6. The optical module of claim 2 wherein the optical module satisfies the following conditional expression:
the sigma CT3 is the thickness of the third lens on the main optical axis, and the sigma CT is the sum of the thicknesses of the polarization reflecting film, the first lens, the wave plate, the second lens, the third lens and the display panel on the main optical axis.
7. The optical module of claim 1, wherein a distance between the first lens and the second lens on a main optical axis is 1.0mm, a distance between the second lens and the third lens on the main optical axis is 2.0mm, and a distance between the third lens and the display panel on the main optical axis is 3.0mm.
8. The optical module of claim 1, wherein the thickness of the first lens element is 2.6mm in the main optical axis, the thickness of the second lens element is 5.8mm in the main optical axis, the thickness of the third lens element is 2.0mm in the main optical axis, and the thickness of the display panel is 0.4mm in the main optical axis.
9. A VR device comprising an optical module according to any one of claims 1 to 8.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114895469B (en) * | 2022-05-19 | 2023-07-25 | 歌尔光学科技有限公司 | Optical module and head-mounted display device |
| CN114859560B (en) * | 2022-05-19 | 2023-09-12 | 歌尔光学科技有限公司 | Optical module and head-mounted display device |
| CN115826223B (en) * | 2023-02-16 | 2023-05-02 | 深圳纳德光学有限公司 | Eyepiece optical component, system and equipment |
| CN117434731B (en) * | 2023-12-14 | 2024-03-15 | 南昌龙旗信息技术有限公司 | Optical module and VR display device |
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| CN208506366U (en) * | 2018-07-25 | 2019-02-15 | 中山市美景光学信息有限公司 | A kind of optical eyepiece system |
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