CN214586228U - Augmented reality optical device - Google Patents
Augmented reality optical device Download PDFInfo
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- CN214586228U CN214586228U CN202023096829.6U CN202023096829U CN214586228U CN 214586228 U CN214586228 U CN 214586228U CN 202023096829 U CN202023096829 U CN 202023096829U CN 214586228 U CN214586228 U CN 214586228U
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Abstract
The utility model provides an augmented reality optical device, which comprises a display image source, a lens group, a flat plate module and a concave semi-reflecting mirror which are arranged in sequence; the display image source is used for emitting a light beam signal, and the light beam signal is refracted to the flat plate module through the lens group; an acute included angle is formed between the arrangement direction of the flat plate module and the normal direction of the display image source, and the flat plate module is used for splitting and polarizing light beam signals refracted by the lens group; the concave semi-reflecting mirror is used for reflecting the light beam signals subjected to the light splitting and polarization treatment of the flat plate module to the imaging end for imaging. Utilize above-mentioned utility model can realize high-quality formation of image effect under the condition that adopts less lens, and install whole small, light in weight, with low costs.
Description
Technical Field
The utility model relates to a AR technical field, more specifically relates to an augmented reality optical device.
Background
At present, an augmented reality technology refers to a technology for displaying real world things and virtual world information in a seamless connection mode to present an ultra-reality mode, and mainly overlaps physical feelings and feelings which are difficult to experience in a real life world through scientific technologies such as computers and integration, virtual information is applied to the real world and is perceived by human senses, and therefore the sense experience beyond reality is achieved.
Therefore, the augmented reality technology can not only display the information of the real world, but also display the virtual information at the same time, and the two kinds of information are mutually supplemented and superposed. For example, in visual augmented reality, a user may superimpose the real world with computer graphics using a device such as a helmet mounted display so that the user can see a combined real and virtual world.
However, in the existing augmented reality technology, the problems of poor imaging analysis, large distortion, relatively small angle of view and the like generally exist; in addition, the adoption of a large number of lenses for improving the imaging quality also causes the problems of large number of lenses, large volume, high relative cost and the like.
SUMMERY OF THE UTILITY MODEL
In view of the above, the present invention is to provide an augmented reality optical device to solve the problems of poor imaging quality, large distortion, small viewing angle, and large number of lenses, large volume, high cost, etc. caused by adopting a large number of lenses to improve the imaging quality in the current augmented reality technology.
The utility model provides an augmented reality optical device, which comprises a display image source, a lens group, a flat plate module and a concave semi-reflecting mirror which are arranged in sequence; the display image source is used for emitting a light beam signal, and the light beam signal is refracted to the flat plate module through the lens group; an acute included angle is formed between the arrangement direction of the flat plate module and the normal direction of the display image source, and the flat plate module is used for splitting and polarizing light beam signals refracted by the lens group; the concave semi-reflecting mirror is used for reflecting the light beam signals subjected to the light splitting and polarization treatment of the flat plate module to the imaging end for imaging.
Further, it is preferable that the lens group includes at least one convex lens and at least one concave lens; the focal length f1 of the convex lens satisfies: 20< f1< 50; the focal length f2 of the concave lens satisfies: -350< f2< -200.
Further, it is preferable that the abbe number of the convex lens satisfies: 1.5< n1< 1.8; the refractive index of the convex lens satisfies: 25< v1< 70; the abbe number of the concave lens satisfies: 1.55< n2< 1.8; the refractive index of the concave lens satisfies: 10< v2< 40; the abbe number of the flat plate module satisfies the following conditions: 1.5< n3< 1.8; the refractive index of the flat plate module satisfies: 35< v3< 70; the abbe number of the concave semi-reflecting mirror satisfies: 1.5< n4<1.8 refractive index of the concave half mirror: 35< v4< 70.
Further, it is preferable that the convex lens and/or the concave half mirror include any one of a spherical surface type, an aspherical surface type, and a free-form surface; and, when convex lens, concave half mirror are the aspheric type, the aspheric type satisfies:
wherein Z represents a distance in the optical axis direction of a point on the aspherical surface from the aspherical surface vertex; r represents the distance of a point on the aspheric surface to the corresponding optical axis; c represents the center curvature of the aspherical surface; k represents the conicity; a4, a6, a8, and a10 represent aspheric high-order term coefficients.
In addition, the flat module preferably includes a flat glass, and a polarizing plate, a polarization splitting plate, and a quarter wave plate sequentially attached to the flat glass.
Further, it is preferable that the central axis direction of the concave half mirror is perpendicular to the normal direction of the display image source.
In addition, the preferable structure is that a first acute angle included angle is formed between the central axis direction of the concave semi-reflecting mirror and the arrangement direction of the flat plate module, and a second acute angle included angle is formed between the arrangement direction of the flat plate module and the normal direction of the display image source; and the sum of the first acute included angle and the second acute included angle is equal to 90 °.
Further, it is preferable that the focal length f3 of the concave half mirror satisfies: 20< f3< 50.
Further, it is preferable that the normal direction of the display image source is perpendicular to the normal direction of the imaging end.
In addition, the preferred structure is that a semi-transparent semi-reflecting film is arranged on one side of the concave semi-reflecting mirror close to the flat plate module.
According to the above technical scheme, the utility model discloses an augmented reality optical device sets up battery of lens and dull and stereotyped module, and the two mutually supports and carries out refraction, beam split and polarization to the light beam signal that shows the image source and send and handles, not only can change the imaging direction of light beam, can also simplify optical device's complexity, does benefit to the miniaturized development of device, and the high, the applicable great angle of vision of imaging quality.
Drawings
Other objects and results of the invention will be more apparent and readily appreciated by reference to the following description taken in conjunction with the accompanying drawings, and as the invention is more fully understood. In the drawings:
fig. 1 is an overall device schematic diagram of an augmented reality optical device according to an embodiment of the present invention;
fig. 2 is a partial enlarged view of a security module according to an embodiment of the present invention;
fig. 3 is a schematic diagram of a beam path of an augmented reality optical device according to an embodiment of the present invention;
fig. 4 is an OTF graph according to an embodiment of the present invention.
Wherein the reference numerals include: the display device comprises a display image source 1, a first lens 2, a second lens 3, a concave half-reflecting mirror 4, a flat module 5, a quarter-wave plate 51, a polarization splitting plate 52, a polarizing plate 53 and flat glass 54.
The same reference numbers in all figures indicate similar or corresponding features or functions.
Detailed Description
For a detailed description of the enhanced display optical device of the present invention, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
Fig. 1 shows an overall schematic structure of an augmented reality optical device according to an embodiment of the present invention.
As shown in fig. 1, the enhanced display optical device according to the embodiment of the present invention includes a display image source 1, a lens set, a flat module 5 and a concave semi-reflecting mirror 4, which are sequentially disposed; the display image source 1 is used for emitting a light beam signal, and the light beam signal is refracted to the flat plate module 5 through the lens group; acute included angles are formed between the arrangement direction of the flat plate module 5 and the normal direction of the display image source 1 and between the arrangement direction of the flat plate module 5 and the normal direction of the concave semi-reflecting mirror 4, and the flat plate module 5 is used for splitting and polarizing light beam signals refracted by the lens group; the concave surface half-reflecting mirror 4 is used for reflecting the light beam signal after being subjected to light splitting and polarization processing by the flat plate module 5 to an imaging end for imaging, and the adjustment of the imaging direction can be realized because the flat plate module 5 is arranged between the lens group and the concave surface half-reflecting mirror 4 and the light beam signal can be subjected to light splitting and polarization processing by the flat plate module 5, and the optical signal of the display image source 1 side can be perfectly presented to the imaging end, so that the visual experience of a user is improved.
Wherein, the lens group includes at least one convex lens and at least one concave lens, in a specific example of the present invention, the lens group includes a first lens 2 and a second lens 3, the first lens 2 can adopt a convex lens, the second lens 3 adopts a concave lens; wherein, the focal length f1 of the convex lens satisfies: 20< f1< 50; the focal length f2 of the concave lens satisfies: -350< f2< -200. The lens group using two lenses can reduce the number of lenses of the display enhancement optical device, reduce the cost of the device and reduce the whole volume.
In order to effectively enhance the optical performance of the display optical device, in one embodiment of the present invention, the abbe number and the refractive index of each lens satisfy the following conditions: the abbe number of the convex lens satisfies: 1.5< n1< 1.8; the refractive index of the convex lens satisfies: 25< v1< 70; the abbe number of the concave lens satisfies: 1.55< n2< 1.8; the refractive index of the concave lens satisfies: 10< v2< 40; the abbe number of the flat plate module 5 satisfies: 1.5< n3< 1.8; the refractive index of the flat plate module 5 satisfies: 35< v3< 70; the abbe number of the concave semi-reflecting mirror 4 satisfies: 1.5< n4<1.8 the refractive index of the concave half mirror 4 satisfies: 35< v4< 70.
In addition, the convex and/or concave lens and/or concave half mirror 4 includes any one of a spherical surface type, an aspherical surface type, and a free-form surface; and, when the convex lens and/or the concave half mirror is an aspherical type, the aspherical type satisfies the following formula:
wherein Z represents a distance in the optical axis direction of a point on the aspherical surface from the aspherical surface vertex; r represents the distance of a point on the aspheric surface to the corresponding optical axis; c represents the center curvature of the aspherical surface; k represents the conicity; a4, a6, a8, and a10 represent aspheric high-order term coefficients.
It should be noted that the flat module 5 is obliquely disposed between the lens set and the concave half mirror 4, the inclination angle and the polarization direction of the flat module 5 can be used to adjust the position of the image, the included angle between the normal of the imaging end and the normal of the display image source 1 can also be adjusted, for example, the normal of the display image source 1 and the normal of the imaging end can be set to be perpendicular, and the flat module 5 is obliquely disposed between the display image source 1 and the imaging end by 45 °.
Specifically, fig. 2 shows the local enlarged structure of the sheet module according to the embodiment of the present invention, and fig. 3 shows the light beam path of the augmented reality optical device according to the embodiment of the present invention.
As shown in fig. 2 and 3, the flat panel module 5 includes a flat glass 54, a polarizing plate 53 attached to the flat glass 54, a polarization splitting plate 52 attached to the polarizing plate 53, and a quarter wave plate 51 attached to the polarization splitting plate 52. The angle between the inclination angle of the flat panel module 5 and the normal of the display image source 1 is 45 degrees, and the angle between the inclination angle of the flat panel module and the normal of the concave semi-reflecting mirror 4 is 45 degrees.
Specifically, in the light transmission process, a natural light or light beam signal is firstly emitted by the display image source 1, passes through the first lens 2 and the second lens 3, and is refracted onto the flat plate module 5; because flat module 5 includes flat module 5 and attached a plurality of retes on dull and stereotyped glass 54, therefore light beam or light pass through polarization beam splitter 52 earlier, polarize light with polarization conversion into the linear polarization through polarization beam splitter 52 to divide into two kinds of linear polarization of P and S, P polarized light transmission wherein, S polarized light reflection.
Then, the P-polarized light enters the polarizer 53 after being transmitted, because the optical axis direction of the light transmitted by the polarizer 53 is perpendicular to the polarization direction of the P-polarized light, the P-polarized light is cut off by the polarizer 53, the S-polarized light reflected back passes through the quarter-wave plate 51 and is converted into circularly polarized light by linearly polarized light, and at the same time, the phase shifts by 45 degrees, the light passes through the quarter-wave plate 51 and reaches the concave half-mirror 4, because the inner side of the concave mirror is plated with a semi-transparent and semi-reflective film, 50% of the light is reflected back, passes through the quarter-wave plate 51 and is converted into linearly polarized light by the circularly polarized light, and at the same time, the phase shifts by 45 degrees, after twice processing by the quarter-wave plate 51, the direction of the optical axis of the polarized light rotates by 90 degrees, and is consistent with the direction of the optical axis of the polarizer 53, the polarized light passes through the polarization beam splitter 52 and the polarizer 53 again, and finally, the whole optical path is completed, and entering an imaging end for imaging. Wherein the imaging end can be human eyes or other imaging devices.
In one embodiment of the invention, the central axis of the concave half mirror 4 is perpendicular to the normal of the display source 1. In addition, a first acute included angle is formed between the central axis direction of the concave semi-reflecting mirror 4 and the arrangement direction of the flat plate module 5, and a second acute included angle is formed between the arrangement direction of the flat plate module 5 and the normal direction of the display image source 1; and the sum of the first acute included angle and the second acute included angle is equal to 90 °.
It should be understood that the tilt angle of the flat panel module 5 is not limited to the specific angle shown in the drawings, and the tilt angle and the specific polarization direction of the flat panel module 5 can be adjusted according to the specific use scene.
In addition, for improving the optical performance among the light ray treatment, in the utility model discloses an among the reinforcing display optical device, the focus f3 of concave surface half reflection mirror 4 satisfies: 20< f3< 50. Simultaneously, can be provided with half-transparent half-reflecting membrane in concave surface half-reflecting mirror 4 near one side of dull and stereotyped module 5 for light can have 50% accessible concave surface half-reflecting mirror 4 to reflect to dull and stereotyped module 5 on, this concave surface half-reflecting mirror 4 also can set up to other kinds of lenses, for example can make light pass through or return lenses such as whole.
Fig. 4 shows OTF curves of an enhanced display optical device according to an embodiment of the present invention.
As shown in fig. 4, the horizontal axis represents the spatial frequency (unit, line/millimeter), and the vertical axis represents the OTF value, so that the enhanced display optical device of the present invention can achieve the OTF value of 0.5 or more when the spatial frequency is about 60, and the imaging resolution is high and the imaging effect is good.
It can be seen from the above embodiments that, the augmented reality optical device provided by the present invention refracts, splits and polarizes the light beam signal emitted from the display image source through the mutual cooperation of the lens group and the flat module, not only can change the imaging direction of the light beam, but also can simplify the complexity of the optical device, and has high imaging quality and can be applied to a larger field angle; in addition, aberration correction can be carried out through two lenses to satisfy the formation quality requirement of high resolution, low distortion, very big reduction the cost and the volume weight of reinforcing display optical module.
A real optical device according to the present invention is described above by way of example with reference to the accompanying drawings. However, it will be appreciated by those skilled in the art that various modifications may be made to the actual optical device proposed by the present invention without departing from the scope of the invention. Therefore, the scope of the present invention should be determined by the content of the appended claims.
Claims (10)
1. An augmented reality optical device is characterized by comprising a display image source, a lens group, a flat plate module and a concave semi-reflecting mirror which are sequentially arranged; wherein the content of the first and second substances,
the display image source is used for emitting a light beam signal, and the light beam signal is refracted to the flat plate module through the lens group;
an acute included angle is formed between the arrangement direction of the flat plate module and the normal direction of the display image source, and the flat plate module is used for splitting and polarizing the light beam signals refracted by the lens group;
the concave semi-reflecting mirror is used for reflecting the light beam signals subjected to the light splitting and polarization treatment of the flat plate module to an imaging end for imaging.
2. Augmented reality optical device according to claim 1,
the lens group comprises at least one convex lens and at least one concave lens;
the focal length f1 of the convex lens satisfies: 20< f1< 50;
the focal length f2 of the concave lens satisfies: -350< f2< -200.
3. Augmented reality optical apparatus according to claim 2,
the abbe number of the convex lens satisfies: 1.5< n1< 1.8;
the refractive index of the convex lens satisfies: 25< v1< 70;
the abbe number of the concave lens satisfies: 1.55< n2< 1.8;
the refractive index of the concave lens satisfies: 10< v2< 40;
the abbe number of the flat plate module satisfies the following conditions: 1.5< n3< 1.8;
the refractive index of the flat plate module satisfies: 35< v3< 70;
the abbe number of the concave semi-reflecting mirror satisfies the following conditions: 1.5< n4<1.8
The refractive index of the concave semi-reflecting mirror satisfies the following conditions: 35< v4< 70.
4. Augmented reality optical apparatus according to claim 2,
the convex lens and/or the concave semi-reflecting mirror comprise any one of a spherical surface type, an aspherical surface type and a free-form surface; and the number of the first and second electrodes,
when the convex lens, the concave lens and the concave semi-reflecting mirror are aspheric, the aspheric satisfies the following conditions:
wherein Z represents a distance in the optical axis direction of a point on the aspherical surface from an aspherical surface vertex; r represents the distance of a point on the aspheric surface to the corresponding optical axis; c represents the central curvature of the aspheric surface; k represents the conicity; a4, a6, a8, a10 represent the aspherical high-order term coefficients.
5. Augmented reality optical device according to claim 1,
the flat plate module comprises flat glass, and a polaroid, a polarization beam splitter and a quarter wave plate which are sequentially attached to the flat glass.
6. Augmented reality optical device according to claim 1,
the central axis direction of the concave semi-reflecting mirror is vertical to the normal direction of the display image source.
7. Augmented reality optical device according to claim 1,
a first acute included angle is formed between the central axis direction of the concave semi-reflecting mirror and the arrangement direction of the flat plate module, and a second acute included angle is formed between the arrangement direction of the flat plate module and the normal direction of the display image source; and the number of the first and second electrodes,
the sum of the first acute included angle and the second acute included angle is equal to 90 °.
8. Augmented reality optical device according to claim 1,
the focal length f3 of the concave semi-reflecting mirror satisfies: 20< f3< 50.
9. Augmented reality optical device according to claim 1,
the normal direction of the display image source is vertical to the normal direction of the imaging end.
10. Augmented reality optical device according to claim 1,
and a semi-transparent semi-reflective film is arranged on one side of the concave semi-reflective mirror close to the flat plate module.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202023096829.6U CN214586228U (en) | 2020-12-21 | 2020-12-21 | Augmented reality optical device |
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|---|---|---|---|
| CN202023096829.6U CN214586228U (en) | 2020-12-21 | 2020-12-21 | Augmented reality optical device |
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| CN214586228U true CN214586228U (en) | 2021-11-02 |
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