CN219417874U - Optical waveguide eyepiece optical system - Google Patents
Optical waveguide eyepiece optical system Download PDFInfo
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- CN219417874U CN219417874U CN202320537328.1U CN202320537328U CN219417874U CN 219417874 U CN219417874 U CN 219417874U CN 202320537328 U CN202320537328 U CN 202320537328U CN 219417874 U CN219417874 U CN 219417874U
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- 230000003287 optical effect Effects 0.000 title claims abstract description 114
- 238000003384 imaging method Methods 0.000 claims abstract description 24
- 210000001747 pupil Anatomy 0.000 claims abstract description 22
- 230000000694 effects Effects 0.000 claims abstract description 6
- 238000010168 coupling process Methods 0.000 claims description 24
- 238000005859 coupling reaction Methods 0.000 claims description 24
- 230000008878 coupling Effects 0.000 claims description 22
- 239000000463 material Substances 0.000 claims description 10
- 239000005304 optical glass Substances 0.000 claims description 5
- 230000008859 change Effects 0.000 claims description 3
- 210000000887 face Anatomy 0.000 claims 2
- 230000002708 enhancing effect Effects 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 10
- 230000004075 alteration Effects 0.000 description 5
- 230000006870 function Effects 0.000 description 5
- 230000004048 modification Effects 0.000 description 5
- 238000012986 modification Methods 0.000 description 5
- 230000007547 defect Effects 0.000 description 2
- 239000006185 dispersion Substances 0.000 description 2
- 238000005457 optimization Methods 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 238000012634 optical imaging Methods 0.000 description 1
- 230000008447 perception Effects 0.000 description 1
Abstract
The utility model provides an optical waveguide eyepiece optical system, which comprises a display module, a lens group and an optical waveguide module. The display module is used for displaying images and emitting imaging light beams into the lens group; the lens group sequentially comprises a first lens, a second lens, a double-cemented lens and a third lens according to the propagation direction of the emission light beam, the emission imaging light beam is changed into parallel light which is coupled into the optical waveguide module after entering the lens group, and the optical waveguide module has smaller coupling-in area and larger coupling-out area for reducing the external dimension of the system and enhancing the display effect, and finally, the imaging is finally carried out at the human eye end by the diffraction and total reflection principles of light. The utility model provides an optical waveguide eyepiece optical system which has clear imaging, small volume, large exit pupil distance and exit pupil diameter and large target surface and simultaneously has a large field angle.
Description
Technical Field
The present utility model relates to the field of optical imaging, and more particularly, to an optical waveguide eyepiece optical system.
Background
The head-wearing optical waveguide projection imaging technology uses high-brightness miniature display equipment as an image source, the image source emits imaging light beams, the imaging light beams are coupled into an optical waveguide structure after passing through a lens system, the imaging light beams are transmitted in a total reflection mode in the optical waveguide structure and finally projected to the front end of human eyes for imaging, and the perception capability of the human eyes and the rapid acquisition capability of key information are enhanced, so that the beyond-vision distance or night cooperative combat is realized.
The existing head-mounted optical waveguide eyepiece system is difficult to make the angle of view large and the volume small on the premise of ensuring the exit pupil distance and the exit pupil diameter; in addition, the width direction of the coupling-in surface and the length direction of the coupling-in surface correspond to different exit pupils, if the imaging characteristics in the two directions cannot be effectively balanced and optimized, imaging defects can be caused, and the actual use effect of a customer is affected.
Disclosure of Invention
In order to solve the problems in the prior art, the utility model provides an optical waveguide eyepiece optical system, which comprises a display module, a lens group and an optical waveguide module, wherein the lens group comprises a first lens, a second lens, a double-cemented lens and a third lens which are coaxially and sequentially arranged from an object space to an image space;
the first lens has negative focal power, is a concave-convex lens, the concave surface of the first lens is close to the object space, and the convex surface of the first lens is close to the image space;
the second lens has positive optical power, which is a biconvex lens;
the double-cemented lens has negative focal power, is a concave-convex lens, the concave surface of the double-cemented lens is close to the object space, and the convex surface of the double-cemented lens is close to the image space;
the third lens has positive optical power, and is a biconvex lens;
the display module displays images and emits imaging light beams which enter the lens group and then become parallel light to be coupled into the optical waveguide module, and finally the imaging light beams are imaged at the eye end of a person through the diffraction and total reflection principles of the light.
On the basis of the technical scheme, the utility model can also make the following improvements.
Optionally, the refractive index of each of the first lens, the second lens, the doublet lens and the third lens is greater than 1.8.
Optionally, both surfaces of the first lens and the third lens are even aspheric surfaces, and both surfaces of the second lens and the double-cemented lens are spherical surfaces.
Optionally, the materials of the first lens, the second lens, the double-cemented lens and the third lens are all optical glass materials.
Optionally, the focal length of the lens group is 12.4mm, the total optical length of the lens group is 20.5mm, and the total optical length of the lens group refers to the distance from the light emitting surface to the end surface of the third lens.
Optionally, the full field angle of the lens group is 42.5 °.
Optionally, the maximum caliber of the lens in the length direction of the coupling surface of the lens group is 20.4mm, and the maximum caliber of the lens in the width direction of the coupling surface is 9.5mm.
Optionally, the diameter of the exit pupil of the coupling-in surface in the length direction of the lens group is greater than or equal to 6mm, and the diameter of the exit pupil of the coupling-in surface in the width direction is greater than or equal to 6mm.
Optionally, the optical waveguide module is a grating optical waveguide, and includes a coupling-in grating surface and a coupling-out grating surface; the coupling-in grating surface is used for receiving the parallel light output by the lens group, and the diffraction effect of the light is utilized to change the propagation direction of the parallel light so as to lead the parallel light to be totally reflected along the direction of the waveguide sheet and propagate without loss; the coupling-out grating surface breaks the total reflection of light, so that parallel light exits from the optical waveguide module and forms an amplified virtual image at the human eye end.
The utility model provides an optical waveguide eyepiece optical system, wherein a lens group comprises a first lens, a second lens, a double-cemented lens and a third lens which are sequentially arranged from an image space to an object space, wherein the first lens and the double-cemented lens are of negative focal power, and the other lenses are of positive focal power. The optical system meets the requirement of small volume and simultaneously has large field angle, large target surface, large exit pupil diameter and long exit pupil distance; by specific optimization of the length direction and the width direction of the coupling-in surface, the overall imaging quality of the system is ensured.
Drawings
FIG. 1 is a schematic diagram of an optical waveguide eyepiece optical system according to an embodiment of the utility model;
FIG. 2 is a schematic view of the optical path structure of the optical waveguide eyepiece optical system according to an embodiment of the present utility model in the longitudinal direction of the coupling surface;
FIG. 3 is a graph of the full field modulation transfer function MTF of the optical waveguide eyepiece optical system of an embodiment of the utility model with a resolution of 30lp/mm in the length direction of the coupling surface;
FIG. 4 is a graph showing field curvature/distortion along the length of the coupling surface of an optical waveguide eyepiece optical system according to an embodiment of the utility model;
FIG. 5 is a schematic view of the optical path structure of the coupling surface of the optical waveguide eyepiece optical system according to an embodiment of the present utility model in the width direction;
FIG. 6 is a graph of the full field modulation transfer function MTF of an optical waveguide eyepiece optical system of an embodiment of the utility model with a resolution of 30lp/mm in the width direction of the coupling surface;
FIG. 7 is a graph showing field curvature/distortion in the width direction of the coupling surface of an optical waveguide eyepiece optical system according to an embodiment of the utility model.
In the drawings, the optical elements represented by the respective reference numerals are:
100. the optical lens comprises a display module 200, a lens group 210, a first lens 220, a second lens 230, a double-cemented lens 240, a third lens 300, an optical waveguide module 310, a coupling-in grating surface 320, a coupling-out grating surface 400, a diaphragm 500 and a human eye end.
Detailed Description
The present utility model will be described in detail with reference to specific examples. The following examples will assist those skilled in the art in further understanding the present utility model, but are not intended to limit the utility model in any way. It should be apparent that the described embodiments of the present utility model are only some embodiments of the present utility model, but not all embodiments, and it should be noted that several variations and modifications can be made by those skilled in the art without departing from the inventive concept. These are all within the scope of the present utility model.
It should be noted that, as used in the present utility model, the words "first," "second," "third," and the like are merely used to describe and distinguish between identical items or similar items that have substantially the same function and action, and are not to be construed as indicating or implying relative importance, but rather, are not limited to data and execution order.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this utility model belongs. The terminology used in the description of the utility model herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the utility model. The term "and/or" as used in this specification includes any and all combinations of one or more of the associated listed items.
Aiming at the defects existing in the prior art, the embodiment of the utility model aims to provide an optical waveguide eyepiece optical system with small volume, large target surface, large exit pupil diameter and large field angle, and simultaneously has specific optimization on the length direction and the width direction of the coupling surface, so that the overall imaging quality of the system is ensured.
An embodiment of the present utility model provides an optical waveguide eyepiece optical system suitable for head-wearing, referring to fig. 1, the optical system mainly includes a display module 100, a lens group 200 and an optical waveguide module 300.
The display module 100 is used for imaging display and emits imaging light beams; the imaging light beam sequentially passes through a first lens 210, a second lens 220, a cemented doublet 230, and a third lens 240 disposed along the lens group 200 from the object side to the image side.
Wherein, the first lens 210 has a concave object side and a convex image side; the first lens 210 has negative optical power for primarily diverging the emission beam of the display module 100, which is advantageous for eliminating curvature of field of the large field optical system.
The second lens 220 has a convex object side and a convex image side; the second lens 220 has positive optical power, and is configured to converge the emitted light beams from the first lens 210, so that the aperture of the subsequent lens is reduced, and the optical system is miniaturized.
The object side of the doublet lens 230 is a concave surface, and the image side is a convex surface; the doublet lens 230 has negative optical power for achromatizing the optical system.
The third lens element 240 has a convex object side and a convex image side; the third lens 240 has positive optical power, and is configured to collect the emitted light beams of the double-cemented lens 230, so that the light beams are converted into parallel light, and are emitted and coupled into the optical waveguide module 300.
The optical waveguide module 300 is a grating optical waveguide and includes an in-coupling grating face 310 and an out-coupling grating face 320. The coupling-in grating surface 310 uses the diffraction effect of light to change the transmission direction of the parallel light so as to satisfy the total reflection condition, and the parallel light propagates forward in the waveguide direction without loss, and enters the coupling-out grating surface 320. The coupling-out grating surface 320 breaks the total reflection condition of the light, so that the parallel light exits from the holographic waveguide and enters the human eye end 500 for imaging.
In the embodiment of the present utility model, both surfaces of the first lens element 210 and the third lens element 240 are even aspheric surfaces, and both surfaces of the second lens element 220 and the cemented doublet lens element 230 are spherical surfaces, so that the use of the aspheric surfaces can effectively eliminate aberration and improve imaging quality.
The materials of the first lens 210, the second lens 220, the doublet lens 230 and the third lens 240 are all optical glass materials.
In the embodiment of the present utility model, the total optical length (the distance from the light emitting surface to the end surface of the third lens) of the lens assembly 200 is only 20.5mm, and the total optical length of the optical system is shorter, so as to achieve the optical design effect of compact structure and miniaturization.
The second lens 220 and the double-cemented lens 230 are both high refractive index, high dispersion optical glass materials, the refractive index of the materials is greater than 1.9, and the abbe number is less than 36. Generally, the higher the refractive index of the optical element is, the higher the dispersion is, and the use of the high refractive index optical glass can effectively reduce the spherical aberration of the optical system and reduce the overall dimension of the optical system.
The first lens 210 and the third lens 240 are made of high refractive index glass materials, the refractive index of the materials is greater than 1.8, the abbe number is greater than 45, and compared with the second lens 220 and the double-cemented lens 230, the chromatic aberration of the optical system can be effectively eliminated, wherein the double-cemented lens 230 can also play a good role in achromatism.
Fig. 2 is a schematic diagram of an optical path structure of an optical waveguide eyepiece optical system in a coupling surface length direction according to an embodiment of the present utility model, in an embodiment of the present utility model, an exit pupil distance in the coupling surface length direction of the lens assembly 200 is 18mm or more, an exit pupil diameter in the coupling surface length direction of the lens assembly 200 is 6mm or more, and a maximum aperture of a lens in the coupling surface length direction of the lens assembly 200 is only 20.4mm. The large exit pupil diameter can ensure that the imaging of the eye end is clear when the optical system is rocked; the long exit pupil distance prevents the human eyes from being too close to the optical waveguide sheet when observing, and improves the observation comfort of the human eyes.
FIG. 3 is a schematic diagram of the MTF value of the full-field modulation transfer function of the lens assembly 200 provided in the embodiment of the utility model in the coupling plane length direction with a resolution of 30lp/mm, and as shown in FIG. 3, the MTF of the full-field optical modulation transfer function of the lens assembly 200 is greater than or equal to 0.4 at a spatial frequency of 30 lp/mm.
Fig. 4 is a diagram of field curvature and distortion of the lens assembly 200 in the coupling plane length direction and full field of view and full band, wherein the left side is the field curvature diagram and the right side is the distortion diagram, and as shown in fig. 4, the field curvature of the lens assembly 200 is controlled within 0.25mm, and the optical distortion is less than or equal to 2%.
Fig. 5 is a schematic view of an optical path structure in a width direction of an input surface of an optical waveguide eyepiece optical system according to an embodiment of the present utility model, in an embodiment of the present utility model, an exit pupil diameter in the width direction of the input surface of the lens assembly 200 is 6mm or more, and a maximum aperture of a lens in the width direction of the input surface of the lens assembly 200 is only 9.5mm.
FIG. 6 is a schematic diagram of the MTF value of the lens assembly 200 provided in the embodiment of the present utility model at a resolution of 30lp/mm in the width direction of the coupling surface, and the MTF of the lens assembly 200 is greater than or equal to 0.25 at a spatial frequency of 30lp/mm as shown in FIG. 6.
Fig. 7 is a diagram of field curvature and distortion of the lens assembly 200 in the coupling plane width direction with full field of view and full band, wherein the left side is the field curvature diagram, and the right side is the distortion diagram, as shown in fig. 7, the field curvature of the lens assembly 200 is controlled within 0.1mm, and the optical distortion is less than or equal to 1%.
In an embodiment of the present utility model, the display module 100 includes, but is not limited to, one of the display chips such as LCD, OLED, LCOS, micro-LED, and the target surface size is preferably equal to or less than 0.36 inch.
The optical waveguide eyepiece optical system provided by the utility model utilizes a multiple structure to respectively carry out optimal design on the width direction of the coupling-in surface and the length direction of the coupling-in surface, so that the lens has the advantages of large field angle, large target surface, large exit pupil diameter, long exit pupil distance and small volume while ensuring imaging quality in the two directions.
In the foregoing embodiments, the descriptions of the embodiments are focused on, and for those portions of one embodiment that are not described in detail, reference may be made to the related descriptions of other embodiments.
While preferred embodiments of the present utility model have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. It is therefore intended that the following claims be interpreted as including the preferred embodiments and all such alterations and modifications as fall within the scope of the utility model.
It will be apparent to those skilled in the art that various modifications and variations can be made to the present utility model without departing from the spirit or scope of the utility model. Thus, it is intended that the present utility model also include such modifications and alterations insofar as they come within the scope of the appended claims or the equivalents thereof.
Claims (9)
1. The optical waveguide eyepiece optical system is characterized by comprising a display module, a lens group and an optical waveguide module, wherein the lens group comprises a first lens, a second lens, a double-cemented lens and a third lens which are coaxially and sequentially arranged from an object space to an image space;
the first lens has negative focal power, is a concave-convex lens, the concave surface of the first lens is close to the object space, and the convex surface of the first lens is close to the image space;
the second lens has positive optical power, which is a biconvex lens;
the double-cemented lens has negative focal power, is a concave-convex lens, the concave surface of the double-cemented lens is close to the object space, and the convex surface of the double-cemented lens is close to the image space;
the third lens has positive optical power, and is a biconvex lens;
the display module displays images and emits imaging light beams which enter the lens group and then become parallel light to be coupled into the optical waveguide module, and finally the imaging light beams are imaged at the eye end of a person through the diffraction and total reflection principles of the light.
2. The optical waveguide eyepiece optical system of claim 1 wherein the first lens, second lens, doublet lens, and third lens each have a refractive index greater than 1.8.
3. The optical waveguide eyepiece optical system of claim 1 wherein both faces of the first lens and the third lens are even aspherical and both faces of the second lens and the doublet lens are spherical.
4. The optical waveguide eyepiece optical system of claim 1 wherein the materials of the first lens, second lens, doublet lens, and third lens are all optical glass materials.
5. The optical waveguide eyepiece optical system of claim 1 wherein the lens group has a focal length of 12.4mm and an optical total length of 20.5mm, the optical total length of the lens group being the distance from the light emitting surface to the third lens end surface.
6. The optical waveguide eyepiece optical system of claim 1 wherein the full field angle of the lens group is 42.5 °.
7. The optical waveguide eyepiece optical system of claim 1 wherein the lens group has a maximum lens diameter of 20.4mm in the length direction of the coupling surface and a maximum lens diameter of 9.5mm in the width direction of the coupling surface.
8. The optical waveguide eyepiece optical system of claim 1, wherein the lens group has an entrance face with an exit pupil diameter in a length direction of 6mm or greater and an entrance face with an exit pupil diameter in a width direction of 6mm or greater.
9. The optical waveguide eyepiece optical system of claim 1, wherein the optical waveguide module is a grating optical waveguide comprising an in-grating face and an out-grating face; the coupling-in grating surface is used for receiving the parallel light output by the lens group, and the diffraction effect of the light is utilized to change the propagation direction of the parallel light so as to lead the parallel light to be totally reflected along the direction of the waveguide sheet and propagate without loss; the coupling-out grating surface breaks the total reflection of light, so that parallel light is emitted from the optical waveguide module and forms an amplified virtual image at the eye end,
the exit pupil distance of the lens group in the length direction of the coupling surface is greater than or equal to 18mm, the full view angle of the lens group is greater than or equal to 42.5 degrees, the exit pupil diameter of the lens group in the length direction of the coupling surface is greater than or equal to 6mm, and the exit pupil diameter of the lens group in the width direction of the coupling surface is greater than or equal to 6mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320537328.1U CN219417874U (en) | 2023-03-17 | 2023-03-17 | Optical waveguide eyepiece optical system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320537328.1U CN219417874U (en) | 2023-03-17 | 2023-03-17 | Optical waveguide eyepiece optical system |
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| Publication Number | Publication Date |
|---|---|
| CN219417874U true CN219417874U (en) | 2023-07-25 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202320537328.1U Active CN219417874U (en) | 2023-03-17 | 2023-03-17 | Optical waveguide eyepiece optical system |
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| CN (1) | CN219417874U (en) |
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- 2023-03-17 CN CN202320537328.1U patent/CN219417874U/en active Active
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Legal Events
| Date | Code | Title | Description |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| PE01 | Entry into force of the registration of the contract for pledge of patent right |
Denomination of utility model: A Optical System for Optical Waveguide Eyepiece Effective date of registration: 20231130 Granted publication date: 20230725 Pledgee: Guanggu Branch of Wuhan Rural Commercial Bank Co.,Ltd. Pledgor: WUHAN ZHENGUANG TECHNOLOGY Co.,Ltd. Registration number: Y2023980068564 |
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| PE01 | Entry into force of the registration of the contract for pledge of patent right |