CN215067534U - Optical module and near-to-eye display optical system - Google Patents
Optical module and near-to-eye display optical system Download PDFInfo
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- CN215067534U CN215067534U CN202121755856.1U CN202121755856U CN215067534U CN 215067534 U CN215067534 U CN 215067534U CN 202121755856 U CN202121755856 U CN 202121755856U CN 215067534 U CN215067534 U CN 215067534U
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Abstract
The utility model provides an optical module and near-to-eye display optical system relates to visual display equipment's technical field, and optical module includes: the image source is used for emitting light rays; the first convex lens is used for correcting the curvature of field and the distortion of the light rays, reducing the incidence angle of the light rays and providing positive focal power and negative spherical aberration for the lens system; the meniscus lens is used for providing negative focal power and providing positive spherical aberration for the lens system; the second convex lens is used for providing positive focal power and negative spherical aberration for the lens system; the lens system is used for reducing the spherical aberration of the light rays to be within a preset range.
Description
Technical Field
The utility model belongs to the technical field of the vision display device technique and specifically relates to an optical module and near-to-eye display optical system are related to.
Background
A near-eye display optical system is also called a helmet display, and is a visual display used for displaying augmented reality, virtual reality, mixed reality, and the like on the head of a user. The head-mounted display of augmented reality can make people look over the surrounding environment simultaneously, with virtual image projection to people's eye, the virtual image of projection can superpose on the real world of user perception. A user can see the fused image of the virtual image and the real image through the near-eye display optical system, and the fused image is in accordance with the scene seen by human eyes.
However, the current part of near-eye display optical systems has low light efficiency, large distortion, poor image quality and large volume, and influences user experience.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide an optical module and near-to-eye display optical system to it is great to alleviate the distortion of current part near-to-eye display optical system, and the image quality is relatively poor, influences user experience's technical problem.
In a first aspect, an embodiment of the present invention provides an optical module, including: the image source comprises an image source and a lens system, wherein the lens system comprises a first convex lens, a meniscus lens and a second convex lens which are sequentially arranged along a light path, and the first convex lens comprises a light incoming surface S1 facing one side of the image source and a light outgoing convex surface S2 facing the light outgoing side and protruding towards the light outgoing side; the meniscus lens comprises a convex light-in surface S3 which faces to the image source side and protrudes towards the image source direction, and a concave light-out surface S4 which faces to the light-out side and is concave towards the image source direction; the second convex lens comprises a light inlet surface S5 facing to the image source side and a light outlet convex surface S6 facing to the light outlet side and protruding towards the light outlet side;
the image source is used for emitting light;
the first convex lens is used for correcting curvature of field and distortion of the light rays, reducing the incidence angle of the light rays and providing positive focal power and negative spherical aberration for the lens system;
the meniscus lens is used for providing negative focal power and positive spherical aberration for the lens system;
the second convex lens is used for providing positive focal power and negative spherical aberration for the lens system; the lens system is used for reducing the spherical aberration of the light rays to be within a preset range.
Further, the image source includes a red light source, a green light source, and a blue light source; the optical module further comprises a light combination prism, the red light source, the green light source and the blue light source are respectively located on one side of three incident surfaces of the light combination prism, and an emergent surface of the light combination prism faces the lens system.
Further, the image source is a light emitting diode.
Further, the focal length f1 of the first convex lens is in the range of: f1>3 mm.
Further, the focal length f2 of the meniscus lens ranges from: f2< -3 mm.
Further, the focal length f3 of the second convex lens is in the range of: f3>5 mm.
Furthermore, the surface shapes of the light-emitting convex surface S2, the light-entering convex surface S3, the light-emitting concave surface S4 and the light-emitting convex surface S6 are spherical or aspheric.
Furthermore, the first convex lens, the meniscus lens and the second convex lens are made of glass or resin.
Further, the surfaces of the light incident surface S1, the light emergent convex surface S2, the light incident convex surface S3, the light emergent concave surface S4, the light incident surface S5 and the light emergent convex surface S6 are coated with antireflection films.
In a second aspect, an embodiment of the present invention provides a near-to-eye display optical system, including the above optical module.
The embodiment of the utility model provides an optical module includes: the image source comprises an image source and a lens system, wherein the lens system comprises a first convex lens, a meniscus lens and a second convex lens which are sequentially arranged along a light path, and the first convex lens comprises a light incoming surface S1 facing one side of the image source and a light outgoing convex surface S2 facing the light outgoing side and protruding towards the light outgoing side; the meniscus lens comprises a convex light-in surface S3 which faces to the image source side and protrudes towards the image source direction, and a concave light-out surface S4 which faces to the light-out side and is concave towards the image source direction; the second convex lens comprises a light inlet surface S5 facing to the image source side and a light outlet convex surface S6 facing to the light outlet side and protruding towards the light outlet side; the image source is used for emitting light; the first convex lens is used for correcting curvature of field and distortion of the light rays, reducing the incidence angle of the light rays and providing positive focal power and negative spherical aberration for the lens system; the meniscus lens is used for providing negative focal power and positive spherical aberration for the lens system; the second convex lens is used for providing positive focal power and negative spherical aberration for the lens system; the lens system is used for reducing the spherical aberration of the light rays to be within a preset range. The light rays are converged after passing through the first convex lens, so that the light rays can be fully utilized, the requirement on the minimum volume of the meniscus lens and the second convex lens can be reduced, the volumes of the meniscus lens and the second convex lens are compressed, and the volume of the lens system is optimized. The optical path of the lens system adopts a (positive + negative + positive) focal power distribution mode and a (negative + positive + negative) spherical aberration distribution mode, so that the optical path becomes very compact, the image quality of the optical system is easier to correct, and the effects of small distortion, small spherical aberration and good image quality are achieved. In this embodiment, the lens system can achieve the purpose of optimizing image quality by using only three lens elements, i.e., the first convex lens, the meniscus lens and the second convex lens, and compared with a product requiring at least four, even more than four, lens elements on the market, the optical module in the present solution has a smaller overall volume and a lower production cost.
The embodiment of the utility model provides a near-to-eye display optical system includes foretell optical module. Because the embodiment of the utility model provides a nearly eye shows optical system and has quoted foretell optical module, so, the utility model provides a nearly eye shows optical system also possesses optical module's advantage.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the technical solutions in the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic view of an optical module according to an embodiment of the present invention;
fig. 2 is a schematic diagram of another optical module according to an embodiment of the present invention;
FIG. 3 is a diagram illustrating aberration contributions of the optical module shown in FIG. 1;
FIG. 4 is a distortion diagram of the optical module of FIG. 1;
FIG. 5 is a graph of MTF of the optical module of FIG. 1;
fig. 6 is a schematic view of another optical module according to an embodiment of the present invention.
Icon: 1-an image source; 2-a first convex lens; 3-meniscus lens; 4-a second convex lens; 5-a light-combining prism; 6-a red light source; 7-green light source; 8-a blue light source; 9-a waveguide sheet assembly; 10-a ghost-eliminating component; 11-diaphragm.
Detailed Description
The technical solution of the present invention will be described clearly and completely with reference to the following embodiments, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
As shown in fig. 1-5, an embodiment of the present invention provides an optical module including: image source 1 and lens system, lens system includes along first convex lens 2, meniscus lens 3 and the second convex lens 4 that the light path set gradually, and the light that image source 1 sent and enter into exit pupil diaphragm 11 department after passing first convex lens 2, meniscus lens 3 and second convex lens 4.
First convex lens 2 is close to image source 1, plays the effect of field lens, is used for correcting the field curvature and the distortion of light, and reduce the incident angle of light and do lens system provides positive focal power and negative spherical aberration, first convex lens 2 includes the income plain noodles S1 towards image source 1 one side to and towards the light-emitting side and to the convex light-emitting convex surface S2 of light-emitting side. The first convex lens 2 contributes negative spherical aberration to the lens system, which is the main contributor to the power of the first convex lens 2, so that the focal length f1 of the first convex lens 2 is relatively small and the sign is positive, ranging from f1>3 mm. Preferred values are 15mm > f1>3 mm.
A meniscus lens 3 is located between the first convex lens 2 and the second convex lens 4, said meniscus lens 3 being adapted to provide said lens system with a negative optical power and to provide a positive spherical aberration. The meniscus lens 3 includes a convex light-entering surface S3 protruding toward the image source 1 and directed toward the image source 1, and a concave light-exiting surface S4 protruding toward the light-exiting side and directed toward the image source 1. The meniscus lens 3 contributes positive spherical aberration to the lens system and is the main contributor to the system power, so the focal length f2 of the meniscus lens 3 is relatively small and the sign is negative, ranging from f2< -3 mm. Preferred values are-20 mm < f2< -3 mm.
The second convex lens 4 is positioned between the meniscus lens 3 and the exit pupil diaphragm 11, and the second convex lens 4 is used for providing positive focal power and negative spherical aberration for the lens system; the second convex lens 4 includes an incident surface S5 facing the image source 1 side, and a convex light-emitting surface S6 facing the light-emitting side and protruding toward the light-emitting side. The second convex lens 4 contributes negative spherical aberration to the lens system, being the main contributor to the system power, so the focal length f3 of the second convex lens 4 is relatively small and positive in sign, ranging from f3>5 mm. Preferred values are 5mm < f3<30 mm.
The light rays are converged after passing through the first convex lens 2, so that the light rays can be fully utilized, the requirement on the minimum volume of the meniscus lens 3 and the second convex lens 4 can be reduced, the volume of the meniscus lens 3 and the second convex lens 4 is reduced, and the volume of the lens system is optimized. The optical path of the lens system adopts a (positive + negative + positive) focal power distribution mode and a (negative + positive + negative) spherical aberration distribution mode, so that the optical path becomes very compact, the image quality of the optical system is easier to correct, and the effects of small distortion, small spherical aberration and good image quality are achieved. In this embodiment, the lens system only uses three lens elements, i.e. the first convex lens 2, the meniscus lens 3 and the second convex lens 4, so as to achieve the purpose of optimizing the image quality, and compared with the product requiring at least four, even more than four lens elements on the market, the optical module in the scheme has smaller overall volume and lower production cost.
It can be seen from the seidel aberration diagram that the meniscus lens 3 generates large positive spherical aberration, positive coma, positive astigmatism and positive distortion, while the second convex lens 4 generates large negative spherical aberration, negative coma, negative astigmatism and negative distortion, which are just complementary to each other, so that the aberration of the system after addition is small, and small distortion and high resolution are realized. Each longitudinal column in fig. 3 includes 7 columns, and each column sequentially represents from left to right: spherical aberration, Coma, Astigmatism, Filed Curvature, Distortion, axial Color, and Lateral Color. And the height of the pillar represents the magnitude of this type of aberration; and the direction of the pillar indicates the positive or negative of this type of aberration.
From the distortion plot, the full field distortion is seen to be less than 0.5%, and from the MTF plot, the full field distortion is seen to be greater than 0.5 at 125 lp/mm. Can embody the small distortion and high definition of the optical system.
The light emitted by the image source 1 may be either linearly polarized or unpolarized. The light rays sequentially pass through the first convex lens 2, the meniscus lens 3 and the second convex lens 4 to reach the position of the exit pupil diaphragm 11, and the light rays are corrected through the aberration of the lens system, so that high imaging quality is realized.
The image source 1 may be a Micro light emitting diode (Micro LED) or an Organic Light Emitting Diode (OLED) or a Liquid Crystal Display (LCD) or a Mini light emitting diode (Mini LED).
The image source 1 comprises a red light source 6, a green light source 7 and a blue light source 8; the optical module further comprises a light combination prism 5, the red light source 6, the green light source 7 and the blue light source 8 are respectively located on one side of three incident surfaces of the light combination prism 5, and an emergent surface of the light combination prism 5 faces the lens system. The red light, the green light and the blue light are combined into full-color light through the light combination prism 5. Then the light rays sequentially pass through the first convex lens 2, the meniscus lens 3 and the second convex lens 4 to reach the position of the exit pupil diaphragm 11, and the light rays are corrected through the aberration of the lens system, so that high imaging quality is realized. The red light source 6, the green light source 7 and the blue light source 8 may be Micro light emitting diodes (Micro LEDs) or Organic Light Emitting Diodes (OLEDs) or Liquid Crystal Displays (LCDs) or Mini light emitting diodes (Mini LEDs).
The light-emitting convex surface S2, the light-entering convex surface S3, the light-emitting concave surface S4 and the light-emitting convex surface S6 can be spherical, aspherical or free-form surfaces, and are preferably spherical and aspherical, so that the processing is convenient.
The first convex lens 2, the meniscus lens 3 and the second convex lens 4 may be made of glass or resin.
The surfaces of the light incident surface S1, the light emergent convex surface S2, the light incident convex surface S3, the light emergent concave surface S4, the light incident surface S5 and the light emergent convex surface S6 are coated with antireflection films, so that the loss of light energy of transmitted light is small, and the luminous efficiency is over 90%.
As shown in fig. 6, the optical module further includes: the optical image system comprises a waveguide piece assembly 9 and a ghost-eliminating assembly 10, wherein light beams emitted by the image source 1 pass through the lens system and then are irradiated onto the waveguide piece assembly 9; the ghost-eliminating component 10 is positioned on the optical path and between the image source 1 and the waveguide plate component 9; the anti-ghosting assembly 10 includes an absorbing polarizer and a quarter-slide sequentially disposed along an optical path. The light from the image source 1 is unpolarized. The light passes through the polarizer in the ghost eliminating assembly 10 and becomes linearly polarized light with the first partial normal, and the linearly polarized light with the first partial normal becomes circularly polarized light after passing through the quarter glass. The circularly polarized light passes through the lens system, so that the light rays are emitted in parallel and then reach the waveguide piece assembly 9, and then reflected light is generated on the surface of the waveguide piece. The reflected light passes through the lens system and then passes through the quarter glass in the ghost eliminating assembly 10 to become polarized light with a second polarization state, the first polarization state is perpendicular to the second polarization state, the polarized light with the second polarization state is absorbed by the polaroid in the ghost eliminating assembly 10, and ghost images cannot reach the image source 1, so that the effect of eliminating ghost images is achieved, the undesirable images in the images are eliminated, and the user experience is improved.
The embodiment of the utility model provides a near-to-eye display optical system includes foretell optical module. Because the embodiment of the utility model provides a nearly eye shows optical system and has quoted foretell optical module, so, the utility model provides a nearly eye shows optical system also possesses optical module's advantage.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention.
Claims (10)
1. An optical module, comprising: the image source comprises an image source (1) and a lens system, wherein the lens system comprises a first convex lens (2), a meniscus lens (3) and a second convex lens (4) which are sequentially arranged along a light path, and the first convex lens (2) comprises a light incoming surface S1 facing one side of the image source (1) and a light outgoing convex surface S2 facing the light outgoing side and protruding towards the light outgoing side; the meniscus lens (3) comprises a convex light-in surface S3 which faces to the image source (1) and protrudes towards the image source (1), and a concave light-out surface S4 which faces to the light-out side and is concave towards the image source (1); the second convex lens (4) comprises a light inlet surface S5 facing one side of the image source (1) and a light outlet convex surface S6 facing the light outlet side and protruding towards the light outlet side;
the image source (1) is used for emitting light;
the first convex lens (2) is used for correcting curvature of field and distortion of the light rays, reducing the incidence angle of the light rays and providing positive focal power and negative spherical aberration for the lens system;
the meniscus lens (3) is used for providing negative focal power and providing positive spherical aberration for the lens system;
the second convex lens (4) is used for providing positive focal power and negative spherical aberration for the lens system; the lens system is used for reducing the spherical aberration of the light rays to be within a preset range.
2. Optical module according to claim 1, in which the image source (1) comprises a red light source (6), a green light source (7) and a blue light source (8); the optical module further comprises a light combination prism (5), the red light source (6), the green light source (7) and the blue light source (8) are respectively located on one side of three incident surfaces of the light combination prism (5), and an emergent surface of the light combination prism (5) faces the lens system.
3. Optical module according to claim 1, in which the image source (1) is a light emitting diode.
4. Optical module according to claim 1, in which the focal length f1 of the first convex lens (2) ranges from: f1>3 mm.
5. Optical module according to claim 1, characterized in that the focal length f2 of the meniscus lens (3) ranges from: f2< -3 mm.
6. Optical module according to claim 1, in which the focal length f3 of the second convex lens (4) ranges from: f3>5 mm.
7. The optical module as claimed in claim 1, wherein the light-exiting convex surface S2, the light-entering convex surface S3, the light-exiting concave surface S4 and the light-exiting convex surface S6 are spherical or aspherical.
8. The optical module according to claim 1, wherein the first convex lens (2), the meniscus lens (3) and the second convex lens (4) are made of glass or resin.
9. The optical module as claimed in claim 1, wherein the films coated on the surfaces of the incident surface S1, the emergent convex surface S2, the incident surface S3, the emergent concave surface S4, the incident surface S5 and the emergent convex surface S6 are antireflection films.
10. A near-eye display optical system comprising the optical module of any one of claims 1-9.
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| CN202121755856.1U CN215067534U (en) | 2021-07-29 | 2021-07-29 | Optical module and near-to-eye display optical system |
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| CN202121755856.1U CN215067534U (en) | 2021-07-29 | 2021-07-29 | Optical module and near-to-eye display optical system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114706189A (en) * | 2022-03-16 | 2022-07-05 | 江西凤凰光学科技有限公司 | Projection optical module for near-eye augmented reality display |
| CN114942522A (en) * | 2022-06-28 | 2022-08-26 | 深圳珑璟光电科技有限公司 | Optical system and near-to-eye display equipment |
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2021
- 2021-07-29 CN CN202121755856.1U patent/CN215067534U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114706189A (en) * | 2022-03-16 | 2022-07-05 | 江西凤凰光学科技有限公司 | Projection optical module for near-eye augmented reality display |
| CN114942522A (en) * | 2022-06-28 | 2022-08-26 | 深圳珑璟光电科技有限公司 | Optical system and near-to-eye display equipment |
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